WO2017170248A1 - 繊維強化ポリアミド樹脂基材、その製造方法、それを含む成形品および複合成形品 - Google Patents
繊維強化ポリアミド樹脂基材、その製造方法、それを含む成形品および複合成形品 Download PDFInfo
- Publication number
- WO2017170248A1 WO2017170248A1 PCT/JP2017/012084 JP2017012084W WO2017170248A1 WO 2017170248 A1 WO2017170248 A1 WO 2017170248A1 JP 2017012084 W JP2017012084 W JP 2017012084W WO 2017170248 A1 WO2017170248 A1 WO 2017170248A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polyamide resin
- terminal
- fiber
- general formula
- modified polyamide
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000002131 composite material Substances 0.000 title claims description 8
- 239000012783 reinforcing fiber Substances 0.000 claims abstract description 88
- 229920000642 polymer Polymers 0.000 claims abstract description 37
- 239000000835 fiber Substances 0.000 claims description 113
- 239000000463 material Substances 0.000 claims description 90
- 150000001875 compounds Chemical class 0.000 claims description 70
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- 239000000155 melt Substances 0.000 claims description 63
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- 238000000034 method Methods 0.000 claims description 52
- 230000014759 maintenance of location Effects 0.000 claims description 35
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 34
- 125000004432 carbon atom Chemical group C* 0.000 claims description 31
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- 125000001183 hydrocarbyl group Chemical group 0.000 claims 5
- 239000002585 base Substances 0.000 description 84
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- 238000011191 terminal modification Methods 0.000 description 47
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- 229920002647 polyamide Polymers 0.000 description 36
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- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 8
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- WTFAGPBUAGFMQX-UHFFFAOYSA-N 1-[2-[2-(2-aminopropoxy)propoxy]propoxy]propan-2-amine Chemical compound CC(N)COCC(C)OCC(C)OCC(C)N WTFAGPBUAGFMQX-UHFFFAOYSA-N 0.000 description 6
- 238000005160 1H NMR spectroscopy Methods 0.000 description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
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- 125000003118 aryl group Chemical group 0.000 description 4
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- 230000008901 benefit Effects 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
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- ILRSCQWREDREME-UHFFFAOYSA-N dodecanamide Chemical compound CCCCCCCCCCCC(N)=O ILRSCQWREDREME-UHFFFAOYSA-N 0.000 description 4
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- 238000000691 measurement method Methods 0.000 description 4
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- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 4
- 229920002239 polyacrylonitrile Polymers 0.000 description 4
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- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
- 229910010271 silicon carbide Inorganic materials 0.000 description 4
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- IIYFAKIEWZDVMP-UHFFFAOYSA-N tridecane Chemical compound CCCCCCCCCCCCC IIYFAKIEWZDVMP-UHFFFAOYSA-N 0.000 description 4
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- BYEAHWXPCBROCE-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropan-2-ol Chemical compound FC(F)(F)C(O)C(F)(F)F BYEAHWXPCBROCE-UHFFFAOYSA-N 0.000 description 3
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
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- IPRJXAGUEGOFGG-UHFFFAOYSA-N N-butylbenzenesulfonamide Chemical compound CCCCNS(=O)(=O)C1=CC=CC=C1 IPRJXAGUEGOFGG-UHFFFAOYSA-N 0.000 description 2
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- 239000000654 additive Substances 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 125000003368 amide group Chemical group 0.000 description 2
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 2
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Definitions
- the present invention relates to a fiber-reinforced polyamide resin substrate, a method for producing the same, a molded product including the same, and a composite molded product.
- a fiber reinforced polyamide resin base material made by impregnating a polyamide resin into a continuous reinforcing fiber or a reinforcing fiber base material in which discontinuous reinforcing fibers are dispersed is excellent in specific strength and specific rigidity, and has a high weight reduction effect. Because of its high heat resistance and chemical resistance, it is preferably used for transportation equipment such as aircraft and automobiles, and various uses such as sports and electric / electronic parts. In recent years, due to the increasing demand for weight reduction, the replacement of metal parts to resin parts, and the miniaturization and modularization of parts are progressing mainly in aircraft and automobile applications. Development of materials with excellent mechanical properties is required.
- a carbon fiber-reinforced polyamide resin prepreg (for example, see Patent Document 1) formed by containing carbon fibers in a polyamide resin is known.
- Patent Document 1 Although the technique disclosed in Patent Document 1 is expected as a lightweight material due to its high mechanical properties, it takes time to impregnate the carbon fiber bundle with the polyamide resin. There was a need for further improvements. Polyamide resins have lower melt flowability as the molecular weight increases, so when used as a fiber-reinforced polyamide resin base material, the impregnation property of the reinforcing fiber bundle decreases, resulting in increased voids, fluff generation, and resin richness. There is a problem that the surface quality is deteriorated due to the increase in the portion. Although the melt fluidity can be improved by increasing the processing temperature, the thermal stability decreases and thermal decomposition accompanied by gas generation occurs during processing. There was a problem that caused a decrease. Then, this invention makes it a subject to provide the fiber reinforced polyamide resin base material which was excellent in impregnation property and thermal stability, and was excellent in surface quality with few voids.
- the fiber-reinforced polyamide resin substrate of the present invention has the following configuration. That is, A fiber-reinforced polyamide resin base material obtained by impregnating a continuous reinforcing fiber or a reinforcing fiber base material in which discontinuous reinforcing fibers are dispersed with a polyamide resin, wherein the polyamide resin is at least a polymer constituting the polyamide resin.
- a fiber-reinforced polyamide resin base material which is a terminal-modified polyamide resin, partly having a structure composed of structural units different from the repeating structural units constituting the main chain of the polymer.
- the manufacturing method of the fiber reinforced polyamide resin base material of this invention has the following structure. That is, When polymerizing amino acids, lactams and / or diamines and dicarboxylic acids, the terminal modifying compound represented by the following general formula (III) is added in an amount of 1 to 20 masses based on the total of amino acids, lactams, diamines and dicarboxylic acids.
- a method for producing a fiber-reinforced polyamide resin substrate, comprising at least a step of impregnating the terminal-modified polyamide resin into a reinforced fiber substrate in which the reinforced fiber or the reinforcing fiber substrate in which the discontinuous fibers are dispersed is dispersed.
- m represents a range of 2 to 100.
- R 1 represents a divalent hydrocarbon group having 2 to 10 carbon atoms
- R 2 represents a monovalent hydrocarbon group having 1 to 30 carbon atoms.
- —X— represents —NH—, —N (CH 3 ) — or —O (C ⁇ O) —.
- —X— represents —NH—, —N (CH 3 ) — or — (C ⁇ O) —.
- the m R 1 contained in the general formula (III) may be the same or different.
- the molded article containing the fiber-reinforced polyamide resin substrate of the present invention has the following configuration. That is, A molded article comprising the fiber-reinforced polyamide resin base material.
- the composite molded article of the present invention has the following configuration. That is, A composite molded product in which the fiber-reinforced polyamide resin base material and a molded product containing a thermoplastic resin are joined at least partially.
- the terminal-modified polyamide resin preferably contains 1 to 20% by mass of the terminal structure represented by the general formula (I).
- the terminal-modified polyamide resin preferably further contains 0.1 to 5% by mass of a terminal structure represented by the following general formula (II).
- R 3 represents a monovalent hydrocarbon group having 1 to 30 carbon atoms.
- X in the general formula (I) is —NH— or —N (CH 3 ) —
- —Y— in the general formula (II) represents — (C ⁇ O) —
- the fiber-reinforced polyamide resin substrate of the present invention is preferably a discontinuous fiber in which the reinforcing fibers are continuously arranged in one direction or the number average fiber length is 3 to 100 mm.
- the reinforcing fiber contains carbon fiber and contains 20 to 70% by volume of reinforcing fiber.
- the terminal-modified polyamide resin has a total of 60 to 250 mol / mol of the terminal structure represented by the general formula (I) and the terminal structure represented by the general formula (II).
- t] and the ratio [mol / t] of the terminal structure represented by the general formula (I) to the content [mol / t] of the terminal structure represented by the general formula (II) ( (I) / (II)) is preferably 0.3 to 2.5.
- the terminal-modified polyamide resin contains a total of 50 to 150 [mol / t] of amino terminal groups and carboxyl terminal groups, and the content of amino terminal groups [mol / t]
- the ratio (amino end group / carboxyl end group) of carboxyl end group content [mol / t] is preferably 0.5 to 2.5.
- the fiber-reinforced polyamide resin base material of the present invention has a relative viscosity ( ⁇ r ) at 25 ° C. of a 98% sulfuric acid solution having a resin concentration of 0.01 g / mL of the terminal-modified polyamide resin of 1.3 to 3.0. Is preferred.
- the fiber-reinforced polyamide resin substrate of the present invention preferably has a weight average molecular weight Mw of 15,000 to 50,000 as measured by gel permeation chromatography of the terminal-modified polyamide resin.
- the fiber-reinforced polyamide resin substrate of the present invention preferably has a melt viscosity of 30 Pa ⁇ s or less under the conditions of the melting point + 60 ° C. and the shear rate of 9,728 sec ⁇ 1 of the terminal-modified polyamide resin.
- the fiber-reinforced polyamide resin base material of the present invention is the content retention rate of the terminal structure represented by the general formula (I) before and after residence for 60 minutes under the condition of melting point + 60 ° C. Amount / content before residence) ⁇ 100) is preferably 80% or more.
- the fiber-reinforced polyamide resin base material of the present invention is a weight average molecular weight retention rate before and after residence for 60 minutes under the condition of melting point + 60 ° C. ((weight average molecular weight after residence / weight average molecular weight before residence) ⁇ 100). Is preferably 80% to 120%.
- the fiber-reinforced polyamide resin base material of the present invention has a melt viscosity retention ((melt viscosity after residence / melt viscosity before residence) ⁇ 100) before and after residence for 60 minutes under the condition of melting point + 60 ° C. of the terminal-modified polyamide resin is 80%. It is preferably ⁇ 120%.
- the weight reduction rate of the terminal-modified polyamide resin before and after residence for 40 minutes under a nitrogen atmosphere under a melting point + 60 ° C. is preferably 4% or less.
- the fiber reinforced polyamide resin base material of the embodiment of the present invention can be formed into a desired shape by any molding method such as autoclave molding, press molding, film molding and the like.
- Molded articles obtained by molding a fiber reinforced polyamide resin base material include, for example, aircraft engine peripheral parts, aircraft interior parts, aircraft exterior parts, vehicle skeleton, automobile engine peripheral parts, automobile under hood parts, automobile gear parts, and automobile interior parts. It is effective to process parts for automobiles such as parts, automobile exterior parts, intake / exhaust parts, engine cooling water parts, automobile electrical parts, and electrical / electronic parts such as LED reflectors and SMT connectors.
- the fiber-reinforced polyamide resin base material of the embodiment of the present invention has one of the following two aspects.
- the first aspect is a fiber-reinforced polyamide resin base material obtained by impregnating a continuous reinforcing fiber with a terminal-modified polyamide resin described later
- the second aspect is a reinforcing fiber base material in which reinforcing fibers of discontinuous fibers are dispersed.
- the continuous reinforcing fiber in the first aspect means that the reinforcing fiber is not interrupted in the fiber-reinforced polyamide resin base material.
- the form and arrangement of the reinforcing fibers in the embodiment of the present invention include those arranged in one direction, woven fabric (cross), knitted fabric, braided string, tow, and the like. Among them, it is preferable that the reinforcing fibers are arranged in one direction because the mechanical properties in a specific direction can be efficiently improved.
- the reinforcing fiber base material in which discontinuous fibers are dispersed in the second aspect refers to a mat-like material in which the reinforcing fibers are cut and dispersed in a fiber reinforced polyamide resin base material.
- the reinforcing fiber base in the embodiment of the present invention can be obtained by an arbitrary method such as a wet method in which fibers are dispersed in a solution and then manufactured into a sheet shape, or a dry method using a carding device or an airlaid device. it can. From the viewpoint of productivity, a dry method using a carding device or an airlaid device is preferable.
- the number average fiber length of the discontinuous fibers in the reinforcing fiber base is preferably 3 to 100 mm. If the number average fiber length of the discontinuous fibers is 3 mm or more, the reinforcing effect by the discontinuous fibers is sufficiently exhibited, and the mechanical strength of the obtained fiber-reinforced polyamide resin base material can be further improved. 5 mm or more is preferable. On the other hand, if the number average fiber length of the discontinuous fibers is 100 mm or less, the fluidity at the time of molding can be further improved. The number average fiber length of the discontinuous fibers is more preferably 50 mm or less, and further preferably 30 mm or less.
- the number average fiber length of the discontinuous fibers in the fiber reinforced polyamide resin substrate of the embodiment of the present invention can be obtained by the following method. First, a 100 mm ⁇ 100 mm sample is cut out from the fiber-reinforced polyamide resin base material, and the cut out sample is heated in an electric furnace at 600 ° C. for 1.5 hours to burn off the matrix resin. From the fiber-reinforced polyamide resin substrate thus obtained, 400 discontinuous reinforcing fiber bundles are randomly collected. About the discontinuous reinforcing fiber bundle taken out, the fiber length is measured in units of 1 mm using calipers, and the number average fiber length (Ln) can be calculated by the following formula.
- the number average fiber length of the discontinuous fibers can be adjusted to the above range by cutting the fibers into a desired length during the production of the reinforcing fiber substrate.
- the orientation of the discontinuous fiber mat is not particularly limited, but isotropic dispersion is preferable from the viewpoint of moldability.
- the type of reinforcing fiber in the first and second forms is not particularly limited, and examples thereof include carbon fiber, metal fiber, organic fiber, and inorganic fiber. Two or more of these may be used.
- carbon fibers examples include PAN-based carbon fibers made from polyacrylonitrile (PAN) fibers, pitch-based carbon fibers made from petroleum tar and petroleum pitch, cellulose-based carbon made from viscose rayon, cellulose acetate, and the like. Examples thereof include vapor-grown carbon fibers made from fibers and hydrocarbons, and graphitized fibers thereof. Of these carbon fibers, PAN-based carbon fibers are preferably used in that they have an excellent balance between strength and elastic modulus.
- PAN-based carbon fibers made from polyacrylonitrile (PAN) fibers
- pitch-based carbon fibers made from petroleum tar and petroleum pitch
- cellulose-based carbon made from viscose rayon, cellulose acetate, and the like. Examples thereof include vapor-grown carbon fibers made from fibers and hydrocarbons, and graphitized fibers thereof.
- PAN-based carbon fibers are preferably used in that they have an excellent balance between strength and elastic modulus.
- metal fibers include fibers made of metal such as iron, gold, silver, copper, aluminum, brass, and stainless steel.
- organic fibers include fibers made of organic materials such as aramid, polybenzoxazole (PBO), polyphenylene sulfide, polyester, polyamide, and polyethylene.
- aramid fiber examples include a para-aramid fiber excellent in strength and elastic modulus and a meta-aramid fiber excellent in flame retardancy and long-term heat resistance.
- para-aramid fiber examples include polyparaphenylene terephthalamide fiber and copolyparaphenylene-3,4'-oxydiphenylene terephthalamide fiber.
- meta-aramid fiber include polymetaphenylene isophthalamide fiber. Is mentioned.
- As the aramid fiber a para-aramid fiber having a higher elastic modulus than the meta-aramid fiber is preferably used.
- the fiber which consists of inorganic materials such as glass, a basalt, a silicon carbide, a silicon nitride
- glass fiber examples include E glass fiber (for electricity), C glass fiber (for corrosion resistance), S glass fiber, and T glass fiber (high strength, high elastic modulus).
- Basalt fiber is a fiber made from basalt, a mineral, and is extremely heat-resistant. Basalt, generally the FeO or FeO 2 is a compound of iron 9-25% by weight, but containing TiO or TiO 2 which is a compound of titanium 1-6% by weight, increase of these components in the molten state It is also possible to fiberize.
- the fiber-reinforced polyamide resin base material in the first and second embodiments of the present invention is often expected to serve as a reinforcing material, it is desirable to exhibit high mechanical properties, and to exhibit high mechanical properties. It is preferable that the reinforcing fiber includes carbon fiber.
- the reinforcing fiber is usually configured by arranging one or a plurality of reinforcing fiber bundles in which a large number of single fibers are bundled.
- the total number of reinforcing fiber filaments (number of single fibers) when one or a plurality of reinforcing fiber bundles are arranged is preferably 1,000 to 2,000,000. From the viewpoint of productivity, the total number of reinforcing fibers is preferably 1,000 to 1,000,000, more preferably 1,000 to 600,000, and more preferably 1,000 to 300,000. Particularly preferred.
- the upper limit of the total number of filaments in the reinforcing fiber is only required to maintain good productivity, dispersibility, and handleability in consideration of balance with dispersibility and handleability.
- the single reinforcing fiber bundle in the first and second embodiments of the present invention is preferably formed by bundling 1,000 to 50,000 reinforcing fiber single fibers having an average diameter of 5 to 10 ⁇ m.
- the fiber-reinforced polyamide resin substrate according to the first aspect of the present invention is characterized in that the polyamide resin impregnated into continuous reinforcing fibers is a terminal-modified polyamide resin.
- the fiber-reinforced polyamide resin base material in the second embodiment of the present invention is characterized in that the polyamide resin impregnated in the reinforcing fiber base material in which the discontinuous fiber reinforcing fibers are dispersed is a terminal-modified polyamide resin.
- the “terminal-modified polyamide resin” in the present invention is a structure in which at least a part of the polymer constituting the polyamide resin is composed of structural units different from the repeating structural units constituting the main chain of the polymer (hereinafter, It may refer to a polyamide resin having a terminal structure of the polymer).
- a polyamide resin having a terminal structure of the polymer By reducing the melt viscosity of the polyamide resin while maintaining mechanical properties such as tensile strength and impact resistance, at least a part of the polymer constituting the polyamide resin has a modified structure at the end group of the polymer. Can do.
- the polymer end group has a structure in which at least a part of the polymer constituting the polyamide resin is modified, thereby reducing the interaction between molecules of the polymer chain and increasing the free volume. This is thought to be because the molecular mobility of the chain is greatly increased.
- the terminal-modified polyamide resin in the embodiment of the present invention is a polyamide resin that can be obtained as a main raw material of at least one selected from amino acids, lactams, and “mixtures of diamine and dicarboxylic acid”, and constitutes the polyamide resin. At least a part of the polymer has a modified structure at the end group of the polymer.
- the terminal-modified polyamide resin in the present invention is a polyamide resin that is polymerized by using at least one selected from the group consisting of a combination of diamine and dicarboxylic acid, an amino acid, and a lactam as a main raw material, At least a part of the constituent polymer has a modified structure at the end group of the polymer.
- the chemical structure constituting the main structural unit of the polyamide resin preferably has a carbon number in the range of 4 to 20 when amino acid or lactam is used as a raw material.
- the diamine preferably has 2 to 20 carbon atoms
- the dicarboxylic acid preferably has 2 to 20 carbon atoms.
- Typical examples of the raw material include the following.
- amino acids such as 6-aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid and paraaminomethylbenzoic acid.
- Lactams such as ⁇ -caprolactam, ⁇ -undecanactam, ⁇ -laurolactam.
- Aliphatic diamines such as diamine, heptadecanediamine, octadecanediamine, nonadecanediamine, eicosanediamine, 2-methyl-1,5-diaminopentane, 2-methyl-1,8-diaminooctane; cyclohexanediamine, bis- ( Cycloaliphatic diamines such as 4-aminocyclohexyl) methane and bis (3-methyl-4-aminocyclohexyl) methane; Diamine such as family diamine.
- Aliphatic dicarboxylic acids such as oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid; terephthalic acid, isophthalic acid, 2-chloroterephthalic acid, Aromatic dicarboxylic acids such as 2-methylterephthalic acid, 5-methylisophthalic acid, 5-sodium sulfoisophthalic acid, hexahydroterephthalic acid and hexahydroisophthalic acid; alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid; Examples thereof include dialkyl esters and dichlorides.
- polyamide homopolymer or copolymer derived from these raw materials can be used as the polyamide resin into which the terminal structure is introduced. Two or more kinds of such polyamides may be mixed to form a polyamide resin.
- the structural units derived from the raw materials exemplified above are modified from the viewpoint of further improving mechanical properties and thermal stability during melt residence and further reducing voids caused by the generated gas. It is preferable to have 80 mol% or more, more preferably 90 mol% or more, and even more preferably 100 mol%, out of 100 mol% of all structural units constituting the polyamide resin excluding the structure.
- the polymerization structure derived from the raw material illustrated above is linear.
- the melting point (Tm) of the terminal-modified polyamide resin of the embodiment of the present invention is preferably 200 ° C. or higher.
- the melting point of the terminal-modified polyamide resin can be determined by differential scanning calorimetry (DSC). The measurement method is as follows. Weigh 5-7 mg of terminal-modified polyamide resin. In a nitrogen atmosphere, the temperature is increased from 20 ° C. to Tm + 30 ° C. at a rate of temperature increase of 20 ° C./min. Subsequently, the temperature is decreased to 20 ° C. at a temperature decrease rate of 20 ° C./min. The temperature at the top of the endothermic peak that appears when the temperature is raised again from 20 ° C. to Tm + 30 ° C. at a rate of temperature increase of 20 ° C./min is defined as the melting point (Tm).
- Examples of the end-modified polyamide resin having a melting point of 200 ° C. or higher include those having a modified structure at the ends of the following polyamides and copolymers thereof. Two or more of these may be used depending on the required properties such as heat resistance, toughness and surface properties.
- Polyamides include polycaproamide (polyamide 6), polyundecanamide (polyamide 11), polydodecanamide (polyamide 12), polyhexamethylene adipamide (polyamide 66), polytetramethylene adipamide (polyamide 46), Polypentamethylene adipamide (polyamide 56), polytetramethylene sebacamide (polyamide 410), polypentamethylene sebacamide (polyamide 510), polyhexamethylene sebacamide (polyamide 610), polyhexamethylene dodecamide ( Polyamide 612), polydecamethylene sebacamide (nylon 1010), polydecamethylene dodecamide (nylon 1012), polymetaxylylene adipamide (MXD6), polymetaxylylene sebacamide (MXD10), polypara Silylene sebacamide (PXD10), polynonamethylene terephthalamide (nylon 9T), polydecamethylene terephthalamide (polyamide 10T), polyundecamethylene
- polyamide 6, polyamide 66, polyamide 56, polyamide 410, polyamide 510, polyamide 610, polyamide 6/66, polyamide 6/12, polyamide 9T, polyamide 10T, etc. which have a modified structure. Things can be mentioned.
- the modified structure contained in the terminal group of the terminal-modified polyamide is different from the structure derived from the repeating structural unit constituting the polymer main chain of the polyamide resin.
- the modified structure include structures derived from saturated aliphatic compounds, unsaturated aliphatic compounds, aromatic compounds, and the like. Two or more of these may be used. From the viewpoint of further improving the impregnation property and surface quality, a structure derived from a saturated aliphatic compound or an aromatic compound is more preferable, and a structure derived from a saturated aliphatic compound is more preferable.
- Examples of the modified structure in the embodiment of the present invention include a residue of a compound for terminal modification described below.
- the terminal-modified polyamide resin of the embodiment of the present invention preferably has a terminal structure represented by the following general formula (I). Since the terminal structure represented by the following general formula (I) has an alkylene oxide structure, the resulting polymer has high molecular mobility and excellent affinity with an amide group.
- the structure represented by the following general formula (I) at the terminal of the polyamide resin is interposed between the polyamide molecular chains, so that the free volume of the polymer is further increased and the entanglement is further decreased.
- the molecular mobility of the polymer can be further increased to reduce the melt viscosity, and the impregnation property and the surface quality can be further improved. Such an effect is extremely high as compared with the case where the polyalkylene oxide structure is mainly included in the main chain of the polyamide resin.
- m represents a range of 2 to 100 (2 or more and 100 or less). As m is larger, the effect of reducing the melt viscosity is effectively exhibited. m is preferably 5 or more, more preferably 8 or more, and still more preferably 16 or more. On the other hand, the smaller m is, the higher the heat resistance can be maintained. m is preferably 70 or less, and more preferably 50 or less.
- the terminal-modified polyamide resin in the present invention preferably has the structure represented by the general formula (I) only at the terminal of the polymer.
- R 1 represents a divalent hydrocarbon group having 2 to 10 carbon atoms (2 to 10 carbon atoms). From the viewpoint of affinity with the main structural unit of the polyamide resin, a hydrocarbon group having 2 to 6 carbon atoms is more preferable, and a hydrocarbon group having 2 to 4 carbon atoms is more preferable.
- R 1 examples include an ethylene group, 1,3-trimethylene group, isopropylene group, 1,4-tetramethylene group, 1,5-pentamethylene group, 1,6-hexamethylene group, and the like.
- Each R 1 may be a combination of hydrocarbon groups having different carbon numbers.
- R 1 is preferably composed of at least a divalent saturated hydrocarbon group having 2 carbon atoms and a divalent saturated hydrocarbon group having 3 carbon atoms.
- the polyamide resin is composed of an ethylene group excellent in affinity with the main structural unit of the polyamide resin and an isopropylene group having a large free volume, and the effect of reducing the melt viscosity can be expressed more effectively.
- the terminal structure represented by the general formula (I) contains 10 or more ethylene groups and 6 or less isopropylene groups, and introduces a terminal structure close to the desired amount into the polyamide resin. It is possible to increase the melt viscosity reduction effect.
- R 2 represents a monovalent hydrocarbon group having 1 to 30 carbon atoms (1 to 30 carbon atoms).
- R 2 is a monovalent saturated hydrocarbon group.
- R 2 include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, and a decyl group.
- the main structural unit of a polyamide resin and A methyl group and an ethyl group, which are excellent in affinity are more preferable.
- —X— represents —NH—, —N (CH 3 ) — or — (C ⁇ O) —.
- —NH— which is excellent in affinity with the main structural unit of the polyamide resin, is more preferable.
- the terminal-modified polyamide resin of the embodiment of the present invention preferably has the terminal structure represented by the general formula (I) in at least a part of the terminal groups of the polymer constituting the terminal-modified polyamide resin.
- the terminal-modified polyamide resin of the present invention preferably has the terminal structure represented by the general formula (I) at at least one terminal of the polymer constituting the terminal-modified polyamide resin.
- the terminal-modified polyamide resin of the embodiment of the present invention contains 1 to 20% by mass (1 to 20% by mass) of the terminal structure represented by the general formula (I) in 100% by mass of the terminal-modified polyamide resin. Is preferred.
- the content of the terminal structure represented by the general formula (I) is 1% by mass or more, the melt viscosity of the terminal-modified polyamide resin is further reduced, the impregnation property and the surface quality are further improved, and voids are further reduced. be able to.
- the content of the terminal structure represented by the general formula (I) is more preferably 3% by mass or more, and further preferably 5% by mass or more.
- the content of the terminal structure represented by the general formula (I) is 20% by mass or less, an increase in gas components due to thermal decomposition of the structure represented by the general formula (I) at the time of melt residence is suppressed, It is possible to further improve the thermal stability at the time of melting and retention, to further reduce voids resulting from the generated gas, and to improve the surface quality. Moreover, since the molecular weight of the terminal-modified polyamide resin can be further increased, the mechanical properties can be further improved.
- the content of the terminal structure represented by the general formula (I) is more preferably 15% by mass or less, and further preferably 10% by mass or less.
- the content of the terminal structure represented by the general formula (I) in the terminal-modified polyamide resin is, for example, the following general formula (III) used when manufacturing the terminal-modified polyamide resin. It can adjust to a desired range by adjusting the compounding quantity of the compound for terminal modification represented.
- the terminal-modified polyamide resin of the embodiment of the present invention preferably further has a terminal structure represented by the following general formula (II).
- a terminal structure represented by the following general formula (II) As described above, by introducing the terminal structure represented by the general formula (I), the melt viscosity of the terminal-modified polyamide resin can be reduced and the impregnation property and the surface quality can be improved. There is a tendency that the thermal decomposition of the terminal structure represented by the general formula (I) tends to proceed during the period of melt residence. In particular, since the amino terminal group and carboxyl terminal group of the polyamide resin act as a thermal decomposition catalyst for the terminal structure represented by the general formula (I), the amount of amino terminal group and carboxyl terminal group in the polyamide resin should be reduced.
- the thermal stability during the melt residence is further improved. Can be improved. For this reason, impregnation property and surface quality can be further improved, and voids can be further reduced.
- the thermal decomposition of the structure represented by the general formula (I) is suppressed, and the melt viscosity reducing effect is maintained while melting.
- the thermal stability during dwelling can be further improved, and the surface quality can be improved along with the reduction of voids.
- a polyamide resin having only the terminal structure represented by the general formula (I) is obtained by reacting the carboxyl terminal group of the polyamide resin with a compound for terminal modification represented by the following general formula (III).
- a compound for terminal modification represented by the following general formula (III) Can do.
- one terminal is modified with the terminal structure represented by the general formula (I), but the other terminal is not modified and remains an amino terminal group or a carboxyl group. Therefore, the amino terminal group or the carboxyl terminal group acts as a thermal decomposition catalyst for the terminal structure represented by the general formula (I), and the thermal decomposition of the structure represented by the general formula (I) easily proceeds.
- the above-mentioned polyamide resin that is, a polyamide resin in which only one terminal is modified with a structure represented by the general formula (I)
- a compound for terminal modification represented by the following general formula (IV) By further reacting, the other terminal can be modified to obtain a polyamide resin further having a terminal structure represented by the following general formula (II).
- the terminal structure represented by the general formula (II) into the polyamide resin modified with the structure represented by the general formula (I), the effects described above can be obtained.
- R 3 represents a monovalent hydrocarbon group having 1 to 30 (1 to 30) carbon atoms. Since the smaller the carbon number of R 3, the better the affinity with the main structural unit of the polyamide resin, it is preferably a hydrocarbon group having 1 to 30 carbon atoms.
- —Y— in the general formula (II) represents — (C ⁇ O) —
- one terminal group is an amino terminal group
- the other terminal group is a carboxyl terminal group.
- the terminal modification compound represented by the general formula (III) when the terminal modification compound represented by the general formula (III) has an amino terminal group, the terminal modification compound reacts with the carboxyl terminal group of the polyamide resin, and X in the general formula (I) is —NH. -Or -N (CH 3 )-.
- the other end of the polyamide resin is reacted with the terminal-modifying compound represented by the general formula (IV) to react the other end of the polyamide resin with the general formula (II). It can be blocked by the terminal structure.
- Y in the general formula (II) is — (C ⁇ O) —.
- the compound for terminal modification represented by the general formula (III) has a carboxyl terminal group
- the compound for terminal modification reacts with the amino terminal group of the polyamide resin
- the other end of the polyamide resin is reacted with the terminal-modifying compound represented by the general formula (IV), so that the other end of the polyamide resin is reacted with the above-described general formula (II).
- Y is —NH— or —N (CH 3 ) —.
- the terminal-modified polyamide resin of the present invention contains the terminal structure represented by the general formula (II) in an amount of 0.1 to 5% by mass (0.1 to 5% by mass) in 100% by mass of the terminal-modified polyamide resin. It is preferable.
- the content of the terminal structure represented by the general formula (II) is 0.1% by mass or more, thermal decomposition of the structure represented by the general formula (I) in the terminal-modified polyamide resin is suppressed during the residence time.
- the thermal stability during melt residence can be further improved, voids can be further reduced, and the surface quality can be improved.
- the content of the terminal structure represented by the general formula (II) is more preferably 0.2% by mass or more, and further preferably 0.4% by mass or more.
- the content of the terminal structure represented by the general formula (II) is 5% by mass or less, the mechanical properties and the thermal stability at the time of melt residence can be further improved, and voids can be further reduced. In addition, the surface quality can be improved.
- the content of the terminal structure represented by the general formula (II) is more preferably 3% by mass or less, and further preferably 1% by mass or less.
- the content of the terminal structure represented by the general formula (II) in the terminal-modified polyamide resin is represented by, for example, the following general formula (IV) used when producing the terminal-modified polyamide resin.
- the terminal-modified polyamide resin in the present invention is a polyamide resin having a terminal structure represented by the general formula (I) and a terminal structure represented by the general formula (II) (that is, one terminal is represented by the general formula (I)). It is preferable that the other terminal contains a polyamide resin modified with the terminal structure represented by the general formula (II).
- a polyamide resin having only a terminal structure represented by the general formula (I) for example, a polyamide in which one terminal is modified with a terminal structure represented by the general formula (I) but the other terminal is not modified
- Resin and a polyamide resin having only a terminal structure represented by the general formula (II) (for example, one terminal is modified with a terminal structure represented by the general formula (II), but the other terminal is
- An embodiment containing a non-modified polyamide resin may also be used.
- the terminal-modified polyamide resin of the present invention has a terminal structure content [mol / t] represented by the general formula (I) and a terminal structure content [mol / t] represented by the general formula (II). Is preferably 60 to 250 mol / t (60 mol / t or more and 250 mol / t or less).
- the melt viscosity of the terminal-modified polyamide resin is further reduced. Impregnation can be further improved, thermal stability during melt residence can be further improved, voids can be further reduced, and surface quality can be improved.
- the total content of these terminal structures is more preferably 70 mol / t or more, and still more preferably 80 mol / t or more.
- the total content of these terminal structures is more preferably 225 mol / t, further preferably 200 mol / t or less.
- the total amount of the terminal structure represented by the general formula (I) and the terminal structure represented by the general formula (II) in the terminal-modified polyamide resin is used when, for example, producing the terminal-modified polyamide resin. It can adjust to the desired range by adjusting the compounding quantity of the compound for terminal modification represented by the below-mentioned general formula (III) and the compound for terminal modification represented by general formula (IV).
- the terminal-modified polyamide resin of the present invention has a terminal structure content [mol / t] represented by the general formula (I) with respect to a content [mol / t] of the terminal structure represented by the general formula (II).
- the ratio ((I) / (II)) is preferably 0.3 to 2.5.
- the polyamide resin undergoes a molecular weight increase due to a polymerization reaction between an amino terminal group and a carboxyl terminal group simultaneously with a decrease in the molecular weight due to thermal decomposition during melt residence.
- melt viscosity of the terminal-modified polyamide resin is further reduced to improve the impregnation property, and the terminal-modified polyamide resin at the time of melt residence Thermal decomposition of the structure represented by the general formula (I) can be further suppressed, thermal stability can be further improved, voids can be further reduced, and surface quality can be improved.
- the molar ratio ((I) / (II)) is more preferably 0.5 or more, preferably 0.6 or more, and most preferably 0.8 or more.
- the molar ratio ((I) / (II)) is more preferably 2.2 or less, and further preferably 2.0 or less.
- the content of the terminal structure represented by the general formula (I) and the terminal structure represented by the general formula (II) in the terminal-modified polyamide resin can be determined by 1 H-NMR measurement, respectively.
- the measurement method and calculation method are as follows.
- a deuterated sulfuric acid solution with a polyamide resin concentration of 50 mg / mL is prepared, and 1 H-NMR measurement is performed with 256 integrations.
- Spectrum integral value of R 1, spectrum integral value of R 2, spectrum integral value of R 3, and from the spectrum integral value of the repeating structural units of the polyamide resin skeleton (the repeating structural units constituting the main chain of the polymer), each end structure Of the terminal structure (I) to the content (mol / t) and the content (mol / t) of the terminal structure (II) (hereinafter referred to as “molar ratio”). Can be calculated).
- the molar ratio ((I) / (II)) in the terminal-modified polyamide resin is, for example, the terminal represented by the general formula (III) described later used when manufacturing the terminal-modified polyamide resin. It can be adjusted to a desired range by the compounding ratio of the modifying compound and the terminal modifying compound represented by the general formula (IV).
- the terminal-modified polyamide resin of the present invention preferably contains a total of 50 to 150 mol / t (50 mol / t or more and 150 mol / t or less) of amino terminal groups and carboxyl terminal groups.
- a total of 50 mol or more of these end groups in the end-modified polyamide resin 1t it is possible to further suppress the decrease in the molecular weight retention during the melt residence and to further improve the thermal stability, resulting in voids resulting from the generated gas. Can be further reduced, and the surface quality can be improved.
- the total content of these end groups is more preferably 60 mol / t or more, and still more preferably 80 mol / t or more.
- the terminal-modified polyamide resin by containing a total of 150 mol / t or less of amino terminal groups and carboxyl terminal groups in the terminal-modified polyamide resin, thermal decomposition of the structure represented by the above general formula (I) in the terminal-modified polyamide resin at the time of melt residence.
- the total content of these end groups is more preferably 135 mol / t or less, and still more preferably 120 mol / t or less.
- the terminal-modified polyamide resin of the present invention has a ratio of the amino terminal group content [mol / t] to the carboxyl terminal group content [mol / t] (amino terminal group content / carboxyl terminal group content). ) Is preferably 0.5 to 2.5 (0.5 or more and 2.5 or less). As described above, the greater the difference between the amount of amino end groups and the amount of carboxyl end groups, the more difficult the polymerization during the melt residence is, and the lower the molecular weight due to thermal decomposition, the greater the decrease in melt viscosity and molecular weight during the melt residence. There is a tendency.
- terminal groups (amino terminal group and carboxyl terminal group) are not consumed in the polymerization reaction, and as described above, these terminal groups become thermal decomposition catalysts of general formula (I), In order to accelerate the thermal decomposition of the alkylene oxide structure in the terminal structure represented by the formula (I), the melt viscosity tends to increase.
- the molar ratio (content of amino end groups / content of carboxyl end groups) is more preferably 0.6 or more, and even more preferably 0.8 or more.
- the molar ratio (amino terminal group / carboxyl terminal group) is more preferably 2.4 or less, and even more preferably 2.3 or less.
- the content of amino terminal groups in the terminal-modified polyamide resin is such that the terminal-modified polyamide resin is dissolved in a phenol / ethanol mixed solution (ratio: 83.5 / 16.5 weight ratio) and thymol blue is used as an indicator. It can be measured by titrating with an aqueous hydrochloric acid solution.
- the content of carboxyl end groups in the terminal-modified polyamide resin is determined by dissolving the terminal-modified polyamide resin in benzyl alcohol at 195 ° C., using phenolphthalein as an indicator, and titrating with an ethanol solution of potassium hydroxide. It can be measured.
- the ratio of the content of the amino terminal group and the content of the carboxyl terminal group of the terminal-modified polyamide resin is represented by, for example, the following general formula (III) used when manufacturing the terminal-modified polyamide resin. It can be adjusted to a desired range by adjusting the compounding ratio of the compound for terminal modification and the compound for terminal modification represented by formula (IV) and the reaction time.
- the terminal-modified polyamide resin of the present invention has a relative viscosity ( ⁇ r ) of a 98% sulfuric acid solution having a resin concentration of 0.01 g / mL at 25 ° C. of 1.3 to 3.0 (1.3 to 3.0). A range is preferable.
- the eta r by 1.3 or more, it is possible to improve the toughness, it is possible to improve the mechanical properties of the substrate. 1.4 or more is preferable, and 1.5 or more is more preferable.
- the impregnation property can be further improved by setting ⁇ r to 3.0 or less. 2.5 or less is preferable and 2.1 or less is more preferable. 2.05 or less is more preferable, and 2.0 or less is most preferable.
- the relative viscosity of the terminal-modified polyamide resin is represented by, for example, a compound for terminal modification represented by the following general formula (III) and the general formula (IV) used when the terminal-modified polyamide resin is produced. It can be adjusted to a desired range by adjusting the blending amount of the compound for terminal modification and the reaction time.
- the weight average molecular weight (Mw) measured by gel permeation chromatography (GPC) of the terminal-modified polyamide resin of the present invention is preferably 15,000 or more. By setting Mw to 15,000 or more, the mechanical characteristics can be further improved. Mw is more preferably 18,000 or more, and further preferably 20,000 or more. Further, Mw is preferably 50,000 or less. By setting Mw to 50,000 or less, the melt viscosity can be further reduced and the impregnation property can be further improved. Mw is more preferably 45,000 or less, and further preferably 40,000 or less.
- the weight average molecular weight (Mw) in the present invention is such that hexafluoroisopropanol (0.005N-sodium trifluoroacetate added) is used as a solvent, “Shodex” (registered trademark) HFIP-806M (two) and HFIP are used as columns. It is obtained by GPC measurement at 30 ° C. using -LG. Polymethyl methacrylate is used as a molecular weight reference material.
- the weight average molecular weight of the terminal-modified polyamide resin is represented by, for example, a compound for terminal modification represented by the following general formula (III) and the general formula (IV) used when producing the terminal-modified polyamide resin. It can be adjusted to a desired range by adjusting the blending amount of the compound for terminal modification and the reaction time.
- the terminal-modified polyamide resin of the present invention preferably has a melt viscosity of 30 Pa ⁇ s or less under the conditions of a melting point + 60 ° C. and a shear rate of 9,728 sec ⁇ 1 .
- the melt viscosity is more preferably 20 Pa ⁇ s or less, further preferably 15 Pa ⁇ s or less, and further preferably 10 Pa ⁇ s or less.
- the melt viscosity is more preferably 0.1 Pa ⁇ s or more, further preferably 0.5 or more, and most preferably 1.0 or more.
- melt viscosity is measured by a capillary flow meter at a shear rate of 9,728 sec ⁇ 1 after being retained for 5 minutes to melt the end-modified polyamide resin at a temperature of the melting point of the end-modified polyamide resin + 60 ° C. Can be measured.
- the melting point + 60 ° C. is selected as a temperature condition in which the effect of good fluidization of the melt is likely to appear and the thermal decomposition does not proceed easily in a short stay
- the resin impregnation 9,728 sec ⁇ 1 was selected as the shear rate, which is a high shear condition assuming time.
- the melt viscosity of the terminal-modified polyamide resin is represented by, for example, a compound for terminal modification represented by the following general formula (III) and the general formula (IV) used when producing the terminal-modified polyamide resin. It can be adjusted to a desired range by adjusting the blending amount of the compound for terminal modification and the reaction time.
- the terminal-modified polyamide resin of the present invention has a content retention of the terminal structure represented by the general formula (I) ((content after residence / content before residence)) before and after residence for 60 minutes under the condition of melting point + 60 ° C. 100) is preferably 80% or more.
- the content retention rate of the terminal structure represented by the general formula (I) is preferably 85% or more, and further preferably 90% or more. From the viewpoint of mechanical properties, the content retention of the terminal structure represented by the general formula (I) is preferably 100% or less.
- the content retention rate of the terminal-modified polyamide resin was determined by determining the content of the terminal structure represented by the general formula (I) by the above-mentioned 1 H-NMR measurement, and then in the capillary flow meter, the terminal modification After retaining for 60 minutes at the melting point of the polyamide resin + 60 ° C., the content of the terminal structure represented by the general formula (I) is similarly determined, and the terminal structure represented by the general formula (I) before the melt residence It can be calculated by dividing by the content of and multiplying by 100.
- the melting point + 60 ° C. was selected as a temperature condition in which the effect of good fluidization of the melt is likely to appear and the thermal decomposition does not proceed easily in a short stay.
- the content retention rate of the terminal structure represented by the general formula (I) in the terminal-modified polyamide resin is expressed by, for example, the general formula (III) described later used when manufacturing the terminal-modified polyamide resin.
- the terminal-modified polyamide resin of the present invention has a weight average molecular weight retention ratio ((weight average molecular weight after residence / weight average molecular weight before residence) ⁇ 100) before and after residence for 60 minutes under the condition of melting point + 60 ° C. 80 to 120% (80% It is preferably 120% or less).
- the weight average molecular weight retention is more preferably 85% or more, and still more preferably 90% or more.
- the weight average molecular weight retention is more preferably 115% or less, and even more preferably 110% or less.
- this weight molecular weight retention rate measured the weight average molecular weight about the terminal modified polyamide resin by the above-mentioned gel permeation chromatography (GPC), and then the melting point of the terminal modified polyamide resin in the capillary flow meter + 60 ° C. After the residence at temperature for 60 minutes, the weight average molecular weight is measured in the same manner, and is calculated by dividing by the weight average molecular weight before the melt residence and multiplying by 100.
- the melting point + 60 ° C. was selected as a temperature condition in which the effect of good fluidization of the melt is likely to appear and the thermal decomposition does not proceed easily in a short stay.
- the weight average molecular weight retention of the terminal-modified polyamide resin is, for example, a compound for terminal modification represented by the following general formula (III) and general formula (IV) used in the production of the terminal-modified polyamide resin. It can adjust to the desired range by adjusting the compounding quantity and reaction time of the compound for terminal modification
- the terminal-modified polyamide resin of the present invention has a melt viscosity retention ratio ((melt viscosity after residence / melt viscosity before residence) ⁇ 100) before and after residence for 60 minutes under the condition of melting point + 60 ° C. (80% to 120%). Or less).
- the melt viscosity retention rate is more preferably 85% or more, more preferably 90% or more, and still more preferably 95% or more.
- the impregnation property can be further improved by setting the melt viscosity retention rate to 120% or less.
- the melt viscosity retention is more preferably 115% or less, and even more preferably 110% or less.
- This melt viscosity retention rate was determined by the capillary flow at a temperature of the melting point of the terminal-modified polyamide resin + 60 ° C., after the terminal-modified polyamide resin was retained for 5 minutes to melt, and then under a shear rate of 9,728 sec ⁇ 1. After the terminal-modified polyamide resin was retained for 60 minutes at the melt viscosity measured by a meter (melt viscosity before retention) and the melting point of the terminal-modified polyamide resin + 60 ° C., the shear rate was 9,728 sec ⁇ 1 .
- melt viscosity (melt viscosity after residence) measured by a capillary flow meter, it can be calculated by (melt viscosity after residence / melt viscosity before residence) ⁇ 100.
- the melting point + 60 ° C. is selected as a temperature condition where the effect of good fluidization of the melt is likely to appear, and the thermal decomposition is difficult to proceed in a short stay
- 9,728 sec ⁇ 1 was selected as the shear rate, which is a high shear condition assuming resin impregnation.
- the melt viscosity retention rate of the terminal-modified polyamide resin is, for example, the terminal-modified compound represented by the following general formula (III) and the general formula (IV) used when producing the terminal-modified polyamide resin. It can be adjusted to a desired range by adjusting the blending amount of the terminal-modifying compound represented and the reaction time.
- the terminal-modified polyamide resin of the present invention preferably has a weight loss rate of 4% or less before and after residence for 40 minutes under a melting point + 60 ° C. in a nitrogen atmosphere.
- the weight reduction rate is more preferably 3% or less, and further preferably 2% or less.
- this weight reduction rate can be measured using a thermogravimetric analyzer (TGA).
- TGA thermogravimetric analyzer
- the melting point + 60 ° C. was selected as an index for evaluating the weight loss rate as a temperature condition in which the effect of good fluidization of the melt tends to appear and the thermal decomposition does not easily proceed in a short stay.
- the weight reduction rate of the terminal-modified polyamide resin is represented by, for example, a terminal-modifying compound represented by the following general formula (III) and a general formula (IV) used when producing the terminal-modified polyamide resin. It can be adjusted to a desired range by adjusting the blending amount of the compound for terminal modification and the reaction time.
- (1) A method of melting and kneading a polyamide resin, a compound for terminal modification, and if necessary, other components at a melting point or higher of the polyamide resin and reacting them, or mixing them in a solution and reacting them.
- (2) a raw material constituting the main structural unit of the polyamide resin (main raw material of the polyamide resin), a compound for terminal modification, and, if necessary, other components are added and reacted (addition method during reaction) ) And the like.
- examples of the terminal modification compound include saturated aliphatic compounds, unsaturated aliphatic compounds, and aromatic compounds. Two or more of these may be used. From the viewpoint of further improving the fluidity, the terminal-modifying compound is preferably a saturated aliphatic compound or an aromatic compound, and more preferably a saturated aliphatic compound.
- saturated aliphatic compounds include monocyclic cycloalkane compounds such as cyclopropane, cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, cyclononane, cyclodecane, cycloundecane, and cyclododecane, and bicyclic rings such as decahydronaphthalene.
- Cyclic saturated aliphatic compounds such as formula cycloalkane compounds, methane, ethane, propane, butane, pentane, hexane, heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, heptadecane, etc.
- Chain saturated aliphatic compounds such as 15 hydrocarbon compounds.
- the cyclic saturated aliphatic compound may have a branched structure, and the chain saturated aliphatic compound may have a straight chain structure or a branched structure.
- a saturated aliphatic compound having one or more terminal structures represented by the following general formula (V) is preferable.
- A represents an alkylene group having 1 to 12 carbon atoms or an arylene group having 6 to 24 carbon atoms.
- a represents an atom or a single bond other than a carbon atom and a hydrogen atom.
- r represents the number of repeating structural units represented by (aA) and is 1 or more.
- W represents a hydroxyl group, an aldehyde group, a carboxyl group, a sulfo group, an amino group, a glycidyl group, an isocyanate group, a carbodiimide group, an oxazoline group, an oxazine group, an ester group, an amide group, a silanol group, or a silyl ether group.
- a in the general formula (V) is a residue obtained by removing two hydrogen atoms from a chain saturated aliphatic compound, and r is 1 to 100 And W is preferably a hydroxyl group. If r is 1 or more, the impregnation property can be further improved. r is preferably 3 or more, and more preferably 5 or more. On the other hand, if r is less than 100, the mechanical properties can be further improved. r is more preferably 70 or less. From the viewpoint of further improving the impregnation properties and mechanical properties, a is preferably an oxygen atom or a single bond, and more preferably an oxygen atom.
- the compound for terminal modification in the embodiment of the present invention may have one terminal structure represented by the above general formula (V) or two or more, but the impregnation property and the mechanical properties may be provided. From the viewpoint of further improvement, it is preferable to have 1 to 4 structures represented by the general formula (V), and it is more preferable to have 1 to 3 structures.
- the terminal-modified polyamide resin of the embodiment of the present invention has the terminal structure represented by the general formula (I) and the terminal structure represented by the above (II) will be described as an example.
- a method for producing such a terminal-modified polyamide resin for example, a raw material of polyamide resin, a compound for terminal modification represented by the general formula (III) and a compound for terminal modification represented by the following general formula (IV) are used. Examples thereof include a method of reacting at the time of polymerization and a method of melt-kneading a polyamide resin and a terminal-modifying compound.
- Examples of the method of reacting at the time of polymerization include, for example, a method in which a polyamide resin raw material and a terminal modification compound are mixed in advance and then condensation is performed by heating, or a terminal modification compound is added during polymerization of the main component raw material. And the like.
- the terminal-modified polyamide resin having a terminal structure represented by the general formula (I) can be polymerized using a terminal-modifying compound represented by the following general formula (III).
- a terminal-modifying compound represented by the following general formula (III) For example, when polymerizing amino acids, lactams and / or diamines and dicarboxylic acids (in other words, using at least one selected from the group consisting of diamines and dicarboxylic acids, amino acids, and lactams as main raw materials) 1 to 20% by mass (1% by mass to 20% by mass) based on the total of amino acids, lactams, diamines and dicarboxylic acids (main raw materials)
- a terminal-modifying compound having 1 to 20% by mass of the terminal structure represented by the general formula (I) can be obtained by bonding the terminal-modifying compound to the terminal of the polyamide resin. it can.
- n represents a range of 2 to 100. Like m in the general formula (I), 5 or more is preferable, 8 or more is more preferable, and 16 or more is more preferable. On the other hand, n is preferably 70 or less, and more preferably 50 or less.
- R 1 represents a divalent hydrocarbon group having 2 to 10 carbon atoms
- R 2 represents a monovalent hydrocarbon group having 1 to 30 carbon atoms. Examples thereof include those exemplified as R 1 and R 2 in the general formula (I).
- X— represents —NH—, —N (CH 3 ) — or —O (C ⁇ O) —.
- -NH- which is excellent in reactivity with the terminal of the polyamide, is more preferable.
- the terminal-modified polyamide resin having a terminal structure represented by the general formula (II) can be polymerized using a terminal-modifying compound represented by the following general formula (IV).
- a terminal-modifying compound represented by the following general formula (IV) For example, when polymerizing amino acids, lactams and / or diamines and dicarboxylic acids (in other words, using at least one selected from the group consisting of diamines and dicarboxylic acids, amino acids, and lactams as main raw materials)
- the terminal modification compound represented by the following general formula (IV) is 0.1 to 5% by mass (0.1% by mass) based on the total of amino acids, lactams, diamines and dicarboxylic acids (main raw materials).
- Terminal modification containing 0.1 to 5% by mass of the terminal structure represented by the general formula (II) by binding the compound for terminal modification to the terminal of the polyamide resin.
- a polyamide resin can be obtained.
- R 3 represents a monovalent hydrocarbon group having 1 to 30 carbon atoms. Similarly to the general formula (II), R 3 is more preferably a monovalent saturated hydrocarbon group from the viewpoint of thermal stability of the terminal-modified polyamide resin and prevention of coloring.
- X in the general formula (III) is —NH— or —N (CH 3 ) —
- —Y— in the general formula (IV) represents —O (C ⁇ O) —
- the general formula (III ) In the formula (IV) represents —NH— or —N (CH 3 ) —.
- the number average molecular weight of the compound for terminal modification represented by the general formula (III) is preferably 500 to 10,000.
- the melt viscosity can be further reduced and the impregnation property can be further improved. More preferably, it is 800 or more, More preferably, it is 900 or more.
- the number average molecular weight is 10,000 or less, the affinity with the main structural unit of the polyamide resin can be further improved, and the mechanical properties of the substrate can be further improved. More preferably, it is 5,000 or less, More preferably, it is 2,500 or less, More preferably, it is 1,500 or less.
- terminal modification compound represented by the general formula (III) examples include methoxypoly (ethylene glycol) amine, methoxypoly (trimethylene glycol) amine, methoxypoly (propylene glycol) amine, and methoxypoly (tetramethylene glycol) amine. , Methoxy poly (ethylene glycol) poly (propylene glycol) amine, methoxy poly (ethylene glycol) carboxylic acid, methoxy poly (trimethylene glycol) carboxylic acid, methoxy poly (propylene glycol) carboxylic acid, methoxy poly (tetramethylene glycol) carboxylic acid, methoxy poly (ethylene Glycol) poly (propylene glycol) carboxylic acid and the like.
- two types of polyalkylene glycols When two types are included, they may have a block polymerization structure or a random copolymer structure. You may use 2 or more types of above-mentioned terminal modification compounds.
- terminal modification compound represented by the general formula (IV) examples include acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, undecanoic acid, lauric acid, tridecane.
- Aliphatic monocarboxylic acids such as acid, myristic acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, arachidic acid, and serotic acid, and cycloaliphatic monocarboxylic acids such as cyclohexanecarboxylic acid and methylcyclohexanecarboxylic acid , Aromatic monocarboxylic acids such as benzoic acid, toluic acid, ethylbenzoic acid, phenylacetic acid, methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, heptylamine, octylamine, 2-ethylhexylamine, nonylamine, Decylamine, Undeci Aliphatic monoamines such as amine, dodecylamine, tridecylamine, tetradecylamine, pentadecylamine,
- the terminal-modified polyamide resin of the present invention has a terminal structure represented by the general formula (I) and a terminal structure represented by the general formula (II).
- An example of the method will be described.
- the methods (1) and (2) have been described above, but will be described in more detail below.
- the melt-kneading temperature is 10 ° C. or more and 40 ° C. or less higher than the melting point (Tm) of the polyamide resin. It is preferable to react.
- the cylinder temperature of an extruder shall be the said range.
- the terminal of the polyamide resin and the terminal modifying compound can be efficiently bonded while suppressing the volatilization of the terminal modifying compound and the decomposition of the polyamide resin.
- the polyamide resin include the polyamide resins described above.
- a terminal-modified polyamide resin is produced by a method in which a polyamide resin raw material and a compound for terminal modification are reacted at the time of polymerization, a melt polymerization method in which the reaction is performed at a temperature higher than the melting point of the polyamide resin; Any solid phase polymerization method may be used.
- the raw material that gives the polyamide resin include the aforementioned amino acids, lactams, and “mixtures of diamine and dicarboxylic acid”.
- the raw material of the terminal-modified polyamide resin is charged into a reaction vessel, purged with nitrogen, and reacted by heating. If the reaction time at this time is too short, not only the molecular weight does not increase, but also the oligomer component increases, so the mechanical properties may decrease. Therefore, it is preferable that the nitrogen flow time in the reaction time is 15 minutes or more. On the other hand, if the reaction time is too long, thermal decomposition proceeds and coloration or the like occurs. Therefore, the nitrogen flow time in the reaction time is preferably 8 hours or less.
- a polymerization accelerator When producing a terminal-modified polyamide resin by a method in which a polyamide resin raw material and a compound for terminal modification are reacted at the time of polymerization, a polymerization accelerator can be added as necessary.
- the polymerization accelerator for example, phosphoric acid, phosphorous acid, hypophosphorous acid, pyrophosphoric acid, polyphosphoric acid and inorganic phosphorus compounds such as alkali metal salts and alkaline earth metal salts thereof are preferable. Sodium acid and sodium hypophosphite are preferably used.
- the polymerization accelerator is preferably used in the range of 0.001 to 1 part by mass with respect to 100 parts by mass of the polyamide resin raw material (excluding the compound for terminal modification). By setting the addition amount of the polymerization accelerator to 0.001 to 1 part by mass, a terminal-modified polyamide resin having an excellent balance between mechanical properties and impregnation properties can be obtained.
- the fiber-reinforced polyamide resin base material of the embodiment of the present invention is formed by impregnating the above-mentioned terminal-modified polyamide resin into a continuous reinforcing fiber or a reinforcing fiber base material in which reinforcing fibers of discontinuous fibers are dispersed. Depending on the situation, it may further contain a filler, other types of polymers, various additives, and the like.
- any material generally used as a filler for a resin can be used, and the strength, rigidity, heat resistance, and dimensional stability of a fiber-reinforced polyamide resin substrate or a molded product can be further improved.
- the filler include glass fiber, carbon fiber, potassium titanate whisker, zinc oxide whisker, aluminum borate whisker, aramid fiber, alumina fiber, silicon carbide fiber, ceramic fiber, asbestos fiber, stone koji fiber, and metal fiber.
- Fibrous inorganic filler wollastonite, zeolite, sericite, kaolin, mica, talc, clay, pyrophyllite, bentonite, montmorillonite, asbestos, aluminosilicate, alumina, silicon oxide, magnesium oxide, zirconium oxide, titanium oxide, oxidation Iron, calcium carbonate, magnesium carbonate, dolomite, calcium sulfate, barium sulfate, magnesium hydroxide, calcium hydroxide, aluminum hydroxide, glass beads, ceramic beads, boron nitride, silicon carbide, silica, etc.
- the fiber reinforced polyamide resin base material in the first aspect as long as it is made of discontinuous fibers as the fibrous filler, it functions without impairing the reinforcing effect of the reinforcing fibers in the fiber reinforced polyamide resin base material. Can be granted.
- the fibrous filler in the fiber reinforced polyamide resin base material in the second aspect, can be used within a range that does not impair the reinforcing effect of the discontinuous fiber base material.
- polymers include, for example, polyolefins such as polyethylene and polypropylene, elastomers such as polyamide elastomer and polyester elastomer, polyester, polycarbonate, polyphenylene ether, polyphenylene sulfide, liquid crystal polymer, polysulfone, polyethersulfone, ABS resin, SAN Examples thereof include resins and polystyrene. Two or more of these may be contained.
- modified polyolefins such as (co) polymers of olefin compounds and / or conjugated diene compounds, polyamide elastomers, polyester elastomers, etc.
- An improver is preferably used.
- Examples of (co) polymers of olefin compounds and / or conjugated diene compounds include ethylene copolymers, conjugated diene polymers, conjugated diene-aromatic vinyl hydrocarbon copolymers, and the like.
- Examples of the ethylene copolymer include copolymers of ethylene and ⁇ -olefins having 3 or more carbon atoms, non-conjugated dienes, vinyl acetate, vinyl alcohol, ⁇ , ⁇ -unsaturated carboxylic acids and derivatives thereof. Can be mentioned.
- Examples of the ⁇ -olefin having 3 or more carbon atoms include propylene and butene-1.
- Examples of the non-conjugated diene include 5-methylidene-2-norbornene, 5-ethylidene-2-norbornene, dicyclopentadiene, 1,4-hexadiene, and the like.
- Examples of the ⁇ , ⁇ -unsaturated carboxylic acid include acrylic acid, methacrylic acid, ethacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, and butenedicarboxylic acid.
- Examples of the derivatives of ⁇ , ⁇ -unsaturated carboxylic acids include alkyl esters, aryl esters, glycidyl esters, acid anhydrides, imides and the like of the ⁇ , ⁇ -unsaturated carboxylic acids.
- the conjugated diene polymer refers to at least one conjugated diene polymer.
- the conjugated diene include 1,3-butadiene, isoprene (2-methyl-1,3-butadiene), 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, and the like. Further, some or all of the unsaturated bonds of these polymers may be reduced by hydrogenation.
- the conjugated diene-aromatic vinyl hydrocarbon copolymer refers to a copolymer of conjugated diene and aromatic vinyl hydrocarbon, and may be a block copolymer or a random copolymer.
- Examples of the conjugated diene include 1,3-butadiene and isoprene.
- Examples of the aromatic vinyl hydrocarbon include styrene.
- a part or all of unsaturated bonds other than double bonds other than the aromatic ring of the conjugated diene-aromatic vinyl hydrocarbon copolymer may be reduced by hydrogenation.
- impact modifiers include ethylene / methacrylic acid copolymers and some or all of the carboxylic acid moieties in these copolymers as salts with sodium, lithium, potassium, zinc, calcium, Examples include ethylene / propylene-g-maleic anhydride copolymer, ethylene / butene-1-g-maleic anhydride copolymer, and the like.
- additives include, for example, antioxidants and heat stabilizers (hindered phenols, hydroquinones, phosphites and their substitutes, copper halides, iodine compounds, etc.), weathering agents (resorcinols, salicylates).
- antioxidants and heat stabilizers hindered phenols, hydroquinones, phosphites and their substitutes, copper halides, iodine compounds, etc.
- weathering agents resorcinols, salicylates.
- Benzotriazole series, benzophenone series, hindered amine series, etc.), mold release agents and lubricants aliphatic alcohol, aliphatic amide, aliphatic bisamide, bisurea, polyethylene wax, etc.
- pigments cadmium sulfide, phthalocyanine, carbon black, etc.
- Dye nigrosine, aniline black, etc.
- plasticizer octyl p-oxybenzoate, N-butylbenzenesulfonamide, etc.
- antistatic agent alkyl sulfate type anionic antistatic agent, quaternary ammonium salt type cationic charging
- Inhibitor polyoxyethylene Nonionic antistatic agents such as rubitan monostearate, betaine amphoteric antistatic agents, etc.
- flame retardants hydramines such as melamine cyanurate, magnesium hydroxide, aluminum hydroxide, ammonium polyphosphate, brominated polystyrene
- the fiber-reinforced polyamide resin substrate of the embodiment of the present invention can be obtained by impregnating continuous reinforcing fibers with a terminal-modified polyamide resin (first aspect). Alternatively, it can be obtained by impregnating a reinforcing fiber base material in which reinforcing fibers of discontinuous fibers are dispersed with a terminal-modified polyamide resin (second embodiment).
- the continuous reinforcing fiber is impregnated with the terminal-modified polyamide resin, for example, the film-like terminal-modified polyamide resin is melted and pressed to impregnate the reinforcing fiber bundle with the terminal-modified polyamide resin.
- the end-modified polyamide resin is applied to the reinforcing fiber bundle by immersing the reinforcing fiber bundle in the end-modified polyamide resin and pressurizing it.
- the thickness of the fiber-reinforced polyamide resin substrate in the first aspect of the present invention is preferably 0.1 to 10 mm. If thickness is 0.1 mm or more, the intensity
- the fiber reinforced polyamide resin base material preferably has a volume content of 20 to 70% by volume.
- the reinforcing fiber is preferably contained in an amount of 20 to 70% by volume (20 to 70% by volume) with respect to the entire fiber reinforced polyamide resin substrate (100% by volume).
- the strength of the molded product obtained using the fiber-reinforced polyamide resin base material can be further improved. 30 volume% or more is more preferable, and 40 volume% or more is further more preferable.
- by containing 70% by volume or less of reinforcing fibers it is easier to impregnate the reinforcing fibers with the terminal-modified polyamide resin. 60 volume% or less is more preferable, and 55 volume% or less is further more preferable.
- the volume content can be adjusted to a desired range by adjusting the input amounts of the reinforcing fiber and the terminal-modified polyamide resin.
- the volume content (V f ) of the reinforced fiber in the fiber reinforced polyamide resin substrate is determined by measuring the mass W 0 of the fiber reinforced polyamide resin substrate, and then heating the fiber reinforced polyamide resin substrate in air at 500 ° C. for 30 minutes. Then, the polyamide resin component is burned off, the mass W 1 of the remaining reinforcing fibers is measured, and can be calculated by the following formula.
- V f (volume%) (W 1 / ⁇ f ) / ⁇ W 1 / ⁇ f + (W 0 ⁇ W 1 ) / ⁇ 1 ⁇ ⁇ 100
- ⁇ f density of reinforcing fiber (g / cm 3 )
- ⁇ r Density of terminal-modified polyamide resin (g / cm 3 )
- the fiber reinforced polyamide resin base material of embodiment of this invention can select desired impregnation property according to the usage and the objective. For example, prepregs with higher impregnation properties, semi-impregnated semi-pregs, and fabrics with low impregnation properties may be used.
- a molding material having a high impregnation property is preferable because a molded product having excellent mechanical properties can be obtained in a short time.
- the terminal-modified polyamide resin is supplied by an extruder to impregnate the reinforcing fiber substrate.
- a method in which a terminal-modified polyamide resin in powder is dispersed and melted in a fiber layer of a reinforcing fiber base a method in which a terminal-modified polyamide resin is formed into a film and laminated with a reinforcing fiber base, a solution in which the terminal-modified polyamide resin is dissolved in a solvent.
- the method of volatilizing the solvent after impregnating the reinforcing fiber base in the state of the above, the method of making the terminal-modified polyamide resin into a mixed yarn with discontinuous fibers, the terminal-modified polyamide resin precursor to the reinforcing fiber base examples include methods of impregnating and then polymerizing to a terminal-modified polyamide resin, and laminating using a melt blown nonwoven fabric.
- the method of supplying the end-modified polyamide resin with an extruder and impregnating the reinforcing fiber base has the advantage that the end-modified polyamide resin does not need to be processed, and the end-modification of the powder
- the method of dispersing and melting the polyamide resin in the fiber layer of the reinforcing fiber base has the advantage of easy impregnation, and the method of forming a film of the terminal modified polyamide resin and laminating it with the reinforcing fiber base has a relatively high quality. There is an advantage that things can be obtained.
- the thickness of the fiber-reinforced polyamide resin substrate in the second aspect of the present invention is preferably 0.1 to 10 mm. If thickness is 0.1 mm or more, the intensity
- the volume content of the fiber-reinforced polyamide resin substrate in the second aspect of the present invention is preferably 20 to 70% by volume. In other words, it is preferable to contain 20% by volume or more and 70% by volume or less of discontinuous fibers in the entire fiber reinforced polyamide resin substrate (100% by volume). By containing 20% by volume or more of discontinuous fibers, the strength of the molded product obtained using the fiber-reinforced polyamide resin substrate can be further improved. 30 volume% or more is more preferable. On the other hand, when the discontinuous fiber is contained in an amount of 70% by volume or less, the discontinuous fiber is more easily impregnated with the terminal-modified polyamide resin. 60 volume% or less is more preferable, and 50 volume% or less is further more preferable. The volume content can be calculated by the above formula (VI).
- the fiber-reinforced polyamide resin substrate according to the second aspect of the present invention can be selected for a desired impregnation property depending on its usage and purpose.
- a molding material having a high impregnation property is preferable because a molded product having excellent mechanical properties can be obtained in a short time.
- a method for adjusting the substrate to a desired thickness or volume content is a method of heating and pressing using a press machine.
- the press machine is not particularly limited as long as it can realize the temperature and pressure necessary for impregnation with the end-modified polyamide resin, and includes a normal press machine having a flat platen that moves up and down, and a pair of endless steel belts. A so-called double belt press having a traveling mechanism can be used.
- One or more fiber-reinforced polyamide resin substrates in the first and second embodiments of the present invention are laminated in an arbitrary configuration, and then molded while applying heat and / or pressure as necessary to obtain a molded product. It is done.
- a press molding method in which a fiber-reinforced terminal-modified polyamide resin laminated in an arbitrary configuration is placed in a mold or on a press plate, and then the mold or press plate is closed and pressurized.
- a fiber reinforced polyamide resin base material is placed in a mold in advance, pressed and heated together with mold clamping, and then the mold is cooled and the fiber reinforced polyamide resin base is cooled.
- the material is cooled by a hot press method to obtain a molded product, or a fiber reinforced polyamide resin base material is heated in advance by a heating device such as a far-infrared heater, a heating plate, a high-temperature oven, dielectric heating, etc. above the melting temperature of the terminal-modified polyamide resin.
- the press molding method is not particularly limited, but stamping molding is desirable from the viewpoint of increasing the productivity by increasing the molding cycle.
- the fiber-reinforced polyamide resin base material and molded product according to the first and second embodiments of the present invention are integrated molding such as insert molding and outsert molding, correction treatment by heating, thermal welding, vibration welding, ultrasonic welding, etc. Can be integrated using an adhesive method or an adhesive having excellent productivity, and a composite can be obtained.
- a composite molded product in which the fiber-reinforced polyamide resin base material in the first and second embodiments of the present invention and a molded product containing a thermoplastic resin are joined at least partially is preferable.
- thermoplastic resin integrated with the fiber-reinforced polyamide resin base material there is no particular limitation on the molded article (molding base material and molded article) containing the thermoplastic resin integrated with the fiber-reinforced polyamide resin base material in the first and second embodiments of the present invention.
- examples include molded products, metal materials and molded products, inorganic materials and molded products.
- a resin material and a molded product are preferable in terms of adhesive strength with the fiber-reinforced terminal-modified polyamide resin in the present invention.
- the matrix material of the molding material and the molded product integrated with the fiber-reinforced polyamide resin base material in the first and second embodiments of the present invention may be the same type of resin as the fiber-reinforced polyamide resin base material and the molded product. It may be a different resin. In order to further increase the adhesive strength, the same kind of resin is preferable. In the case of a different kind of resin, it is more preferable to provide a resin layer at the interface.
- V f volume content (V f )
- V f (volume%) (W 1 / ⁇ f ) / ⁇ W 1 / ⁇ f + (W 0 ⁇ W 1 ) / ⁇ 1 ⁇ ⁇ 100
- ⁇ f density of reinforcing fiber
- ⁇ r Density of terminal-modified polyamide resin (g / cm 3 ) [Relative viscosity ( ⁇ r )] The relative viscosity was measured at 25 ° C. using an Ostwald viscometer for the 98% sulfuric acid solution of the terminal-modified polyamide resin or polyamide resin obtained in each Example and Comparative Example and having a resin concentration of 0.01 g / mL.
- [Amino terminal group amount [NH 2 ]] 0.5 g of the end-modified polyamide resin or polyamide resin obtained in each Example and Comparative Example was precisely weighed, and 25 mL of a phenol / ethanol mixed solution (ratio: 83.5 / 16.5 mass ratio) was added and dissolved at room temperature. Then, titration with 0.02 N hydrochloric acid was performed using thymol blue as an indicator to determine the amino terminal group amount (mol / t).
- terminal-modified polyamide resin or polyamide resin obtained in Examples and Comparative Examples was subjected to 1 H-NMR measurement using FT-NMR: JNM-AL400 manufactured by JEOL Ltd. First, a solution having a sample concentration of 50 mg / mL was prepared using deuterated sulfuric acid as a measurement solvent. The polyamide resin was subjected to 1 H-NMR measurement at a cumulative number of 256 times.
- the integrated intensity of each peak is calculated, and the content [I] of the terminal structure represented by the general formula (I) in the terminal-modified polyamide resin is calculated from the calculated integrated intensity and the number of hydrogen atoms in each structural unit.
- mol / t, mass%) (content before residence) and content [II] (mol / t, mass%) of the terminal structure represented by the general formula (II) were calculated.
- melt viscosity The terminal-modified polyamide resin or polyamide resin obtained in each example and comparative example was dried in an 80 ° C. vacuum dryer for 12 hours or more.
- a melt viscosity measuring device a capillary flow meter (manufactured by Toyo Seiki Seisakusho Co., Ltd., Capillograph 1C type) is used, and an orifice having a diameter of 0.5 mm and a length of 5 mm, melting point + 60 ° C., shear rate 9,728 sec ⁇
- the melt viscosity (melt viscosity before residence) was measured under the condition of 1 .
- the measurement was carried out after being retained for 5 minutes. It shows that it has high fluidity, so that the value of this melt viscosity is small.
- melt viscosity retention The terminal-modified polyamide resin or polyamide resin obtained in each example and comparative example was dried in an 80 ° C. vacuum dryer for 12 hours or more. Using a capillary flow meter (Capillograph 1C type, manufactured by Toyo Seiki Seisakusyo Co., Ltd.), melted and retained at melting point + 60 ° C. for 60 minutes with an orifice having a diameter of 0.5 mm and a length of 5 mm, and a shear rate of 9,728 sec ⁇ 1 The melt viscosity (melt viscosity after residence) was measured under the following conditions.
- melt viscosity retention [%] was calculated by (melt viscosity after residence / melt viscosity before residence) ⁇ 100.
- the terminal-modified polyamide resin or polyamide resin obtained in each example and comparative example was dried in an 80 ° C. vacuum dryer for 12 hours or more. Using a capillary flow meter (Capillograph 1C type, manufactured by Toyo Seiki Seisakusho Co., Ltd.), melt residence was performed at an melting point of + 60 ° C. for 60 minutes with an orifice having a diameter of 0.5 mm and a length of 5 mm. About the terminal modified polyamide resin or polyamide resin after melt residence, the weight average molecular weight (Mw) (weight average molecular weight after residence) was measured by GPC measurement similar to the molecular weight measurement method described above.
- Mw weight average molecular weight after residence
- the content of the terminal structure represented by the general formula (I) in the terminal-modified polyamide resin by 1 H-NMR measurement similar to the above-described terminal structure content measurement method [ I] (mol / t) (content after residence) was calculated.
- Content of terminal structure represented by general formula (I) [I] (mol / t) (content before residence) and content of terminal structure represented by general formula (I) measured by the above method [ I] The content retention was calculated from (mol / t) (content after residence) (content after residence / content before residence) ⁇ 100.
- the terminal-modified polyamide resin or polyamide resin obtained in each example and comparative example was dried in an 80 ° C. vacuum dryer for 12 hours or more. 20 mg of an arbitrary portion was cut out and held for 40 minutes at a temperature of the melting point of the terminal-modified polyamide resin or polyamide resin + 60 ° C. in a nitrogen gas atmosphere using a thermogravimetric analyzer (Perkin Elmer, TGA7), and the weight decreased before and after the heat treatment. The rate [%] was measured.
- dumbbell-shaped test piece was subjected to “Tensilon” (registered trademark) UTA-2.5T (manufactured by Orientec Co., Ltd.) and in an atmosphere of 23 ° C. and 50% humidity according to ASTM-D638.
- a tensile test was performed at a strain rate of 10 mm / min to measure the tensile elongation at break.
- the cross section in the thickness direction of the fiber reinforced polyamide resin base material obtained in each example and comparative example was observed as follows.
- a sample in which a fiber-reinforced terminal-modified polyamide resin was embedded with an epoxy resin was prepared, and the sample was polished until the cross-section in the thickness direction of the fiber-reinforced terminal-modified polyamide resin could be observed well.
- the polished sample was photographed at a magnification of 400 times using an ultra-deep color 3D shape measuring microscope VHX-9500 (controller part) / VHZ-100R (measuring part) (manufactured by Keyence Corporation).
- the photographing range was set to a range of the thickness of the fiber-reinforced terminal-modified polyamide resin ⁇ the width of 500 ⁇ m.
- the area of the part occupied by the resin and the area of the part serving as a void were obtained, and the impregnation rate was calculated by the following equation.
- Impregnation rate (%) 100 ⁇ (total area occupied by resin) / ⁇ (total area occupied by resin) + (total area occupied by voids) ⁇
- This impregnation rate was used as a criterion for evaluation, and was evaluated in the following two stages.
- the fiber-reinforced polyamide resin substrate in the first embodiment was produced at processing temperatures of melting points + 30 ° C., 60 ° C., and 100 ° C.
- the fiber-reinforced polyamide resin base material in the second embodiment was produced at processing temperatures of melting point + 10 ° C, 20 ° C, 30 ° C. Good: The impregnation rate is 98% or more.
- Impregnation rate is less than 98%.
- the fiber-reinforced polyamide resin substrate in the first aspect has a melting point of + 30 ° C., 60 It was manufactured at a processing temperature of 100 ° C.
- the fiber-reinforced polyamide resin base material in the second embodiment was produced at processing temperatures of melting point + 10 ° C, 20 ° C, 30 ° C.
- Adipic acid Wako Pure Chemical Industries, Wako Special Grade.
- ⁇ Sebacic acid Wako Pure Chemical Industries, Wako first grade.
- Methoxypoly (ethylene glycol) poly (propylene glycol) amine represented by the following structural formula (Chemical Formula 2): “JEFFAMINE” (registered trademark) M2070 (number average molecular weight Mn2,000) manufactured by HUNTSMAN.
- Methoxyethylene glycol poly (propylene glycol) amine represented by the following structural formula (Chemical Formula 3): “JEFFAMINE” (registered trademark) M600 (number average molecular weight Mn600) manufactured by HUNTSMAN.
- the internal pressure of the can was maintained at 1.0 MPa while releasing moisture out of the system, and the temperature was increased until the internal temperature of the can reached 240 ° C.
- the heater set temperature was changed to 270 ° C., and the internal pressure of the can was adjusted to normal pressure over 1 hour (can internal temperature when reaching normal pressure: 243 ° C.) .
- nitrogen was allowed to flow in the can (nitrogen flow) for 240 minutes to obtain a terminal-modified polyamide 6 resin (maximum temperature reached: 253 ° C.).
- the obtained terminal-modified polyamide 6 resin was subjected to Soxhlet extraction with ion-exchanged water to remove the unreacted terminal-modifying compound.
- the terminal-modified polyamide 6 resin thus obtained had a relative viscosity of 1.81, a weight average molecular weight of 30,000, a melting point (Tm) of 220 ° C., and a melt viscosity of 5.5 Pa ⁇ s.
- the obtained terminal-modified polyamide 6 resin contained a terminal-modified polyamide 6 resin having a structure represented by the following chemical formula 4 and a structure represented by the following chemical formula 5 at its ends. Other physical properties are shown in Table 1.
- each carbon fiber bundle wound thereon Sixteen bobbins each having a carbon fiber bundle wound thereon were prepared, and each carbon fiber bundle was continuously fed out from each bobbin through a yarn path guide.
- the carbon fiber bundle continuously fed out was impregnated with the end-modified polyamide 6 resin obtained by the above-mentioned method, which was supplied in a constant amount from a filled feeder in an impregnation die.
- the carbon fiber impregnated with the end-modified polyamide 6 resin in the impregnation die was continuously drawn out from the nozzle of the impregnation die at a drawing speed of 1 m / min using a take-up roll.
- the temperature at which the carbon fiber is drawn is called the processing temperature.
- the drawn carbon fiber bundle passed through a cooling roll, the terminal-modified polyamide 6 resin was cooled and solidified, and was wound on a winder as a continuous fiber-reinforced polyamide resin base material.
- the obtained fiber reinforced polyamide resin base material has a thickness of 0.3 mm, a width of 50 mm, a reinforced fiber direction arranged in one direction, a volume content of 30%, and a number average fiber length of 15 mm.
- a substrate was obtained.
- the obtained fiber reinforced polyamide resin substrate was subjected to the above evaluation. The evaluation results are shown in Table 1.
- Examples 2 to 39, Comparative Examples 1 to 3 After changing the raw materials to the compositions shown in Tables 1 to 5 and setting the pressure in the can to normal pressure, the time for keeping nitrogen flowing in the can (nitrogen flow time) was changed to the time shown in Tables 1 to 5. Except that, a terminal-modified polyamide 6 resin was obtained in the same manner as in Example 1. Fiber reinforced in the same manner as in Example 1 except that the terminal-modified polyamide 6 resin or polyamide 6 resin obtained in each Example and Comparative Example was used instead of the terminal-modified polyamide 6 resin obtained in Example 1. A polyamide resin substrate was obtained. Tables 1 to 5 show the physical properties of the obtained terminal-modified polyamide 6 resin and the physical properties of the fiber-reinforced polyamide resin base material.
- Example 40 9.46 g of hexamethylenediamine, 11.92 g of adipic acid, 20 g of ion-exchanged water, 1.6 g of “JEFFAMINE” (registered trademark) M1000, and 0.14 g of benzoic acid were charged in a reaction vessel, sealed, and purged with nitrogen. The set temperature of the heater on the outer periphery of the reaction vessel was set to 290 ° C., and heating was started. After the internal pressure of the can reached 1.75 MPa, the internal pressure of the can was maintained at 1.75 MPa while releasing water out of the system, and the temperature was increased until the internal temperature of the can reached 260 ° C.
- JEFFAMINE registered trademark
- the set temperature of the heater was changed to 290 ° C., and the internal pressure of the can was adjusted to be normal pressure over 1 hour (internal temperature at the time of reaching normal pressure: 270 ° C.). .
- nitrogen was allowed to flow in the can (nitrogen flow) for 240 minutes to obtain a terminal-modified polyamide 66 resin (maximum temperature reached: 275 ° C.).
- the obtained polyamide resin contained a terminal-modified polyamide 66 resin having the structure shown in Example 1 at its terminal.
- a fiber-reinforced polyamide 66 resin substrate was obtained using the obtained terminal-modified polyamide 66 resin in the same manner as in Example 1 except that the processing temperature was 320 ° C.
- Table 6 shows the physical properties of the obtained terminal-modified polyamide 66 resin and the physical properties of the fiber-reinforced polyamide 66 resin base material.
- a reaction vessel was charged with 7.74 g of hexamethylenediamine, 13.46 g of sebacic acid, 20 g of ion-exchanged water, 1.6 g of “JEFFAMINE” (registered trademark) M1000, and 0.14 g of benzoic acid, and the atmosphere was replaced with nitrogen.
- the set temperature of the heater on the outer periphery of the reaction vessel was set to 290 ° C., and heating was started. After the internal pressure of the can reached 1.0 MPa, the internal pressure of the can was maintained at 1.0 MPa while releasing moisture out of the system, and the temperature was increased until the internal temperature of the can reached 240 ° C. After the can internal temperature reached 240 ° C., the heater set temperature was changed to 290 ° C., and the internal pressure of the can was adjusted to be normal pressure over one hour (can internal temperature when normal pressure reached: 243 ° C.). .
- the obtained polyamide resin contained terminal-modified polyamide 610 resin having the structure shown in Example 1 below at its terminal.
- a fiber-reinforced polyamide 610 resin substrate was obtained using the terminal-modified polyamide 610 resin obtained in the same manner as in Example 1 except that the processing temperature was 280 ° C.
- Table 6 shows the physical properties of the resulting terminal-modified polyamide 610 resin and the physical properties of the fiber-reinforced polyamide 610 resin base material.
- a terminal-modified polyamide resin was obtained in the same manner as in Example 1. The obtained terminal-modified polyamide resin was put into an extruder, melt-kneaded and then extruded into a film form from a film die to obtain a resin film.
- the carbon fiber used as the reinforcing fiber was cut into a fiber length of 15 mm and put into an air laid apparatus to obtain a mat-like reinforcing fiber substrate having a basis weight of 100 g / m 2 .
- the mold temperature processing temperature
- a cooling press was performed at a pressure of 3 MPa to obtain a fiber-reinforced polyamide resin base material having a volume content of 30%.
- the obtained fiber reinforced polyamide resin substrate was subjected to the above evaluation. Table 7 shows the evaluation results.
- Examples 43 to 80, Comparative Examples 4 to 6 After changing the raw materials to the compositions shown in Tables 7 to 11 and setting the pressure in the can to normal pressure, the time for keeping nitrogen flowing in the can (nitrogen flow time) was changed to the time shown in Tables 7 to 11. Except that, a terminal-modified polyamide 6 resin was obtained in the same manner as in Example 40. Fiber reinforced in the same manner as in Example 42 except that the terminal modified polyamide 6 resin or polyamide 6 resin obtained in each Example and Comparative Example was used instead of the terminal modified polyamide 6 resin obtained in Example 42. A polyamide resin substrate was obtained. Tables 7 to 11 show the physical properties of the resulting terminal-modified polyamide 6 resin and the physical properties of the fiber-reinforced polyamide resin substrate.
- Example 81 In the same manner as in Example 40, a terminal-modified polyamide 66 resin was obtained. A fiber-reinforced polyamide 610 resin substrate was obtained using the terminal-modified polyamide 610 resin obtained in the same manner as in Example 42 except that the processing temperature was 290 ° C. Table 12 shows the physical properties of the obtained terminal-modified polyamide 610 resin and the physical properties of the fiber-reinforced polyamide 610 resin base material. [Example 82] In the same manner as in Example 41, a terminal-modified polyamide 610 resin was obtained. A fiber-reinforced polyamide 610 resin substrate was obtained using the terminal-modified polyamide 610 resin obtained in the same manner as in Example 42 except that the processing temperature was 250 ° C. Table 12 shows the physical properties of the obtained terminal-modified polyamide 610 resin and the physical properties of the fiber-reinforced polyamide 610 resin base material.
- the terminal-modified polyamide resins obtained in Examples 10 to 12 and 51 to 53 include a structure represented by the following chemical formula 6 and a terminal-modified polyamide having a structure represented by the chemical formula 5 at its terminal. It was.
- the terminal-modified polyamide resin obtained in Examples 13 and 54 contained a structure represented by the following chemical formula 7 and a terminal-modified polyamide having a structure represented by the chemical formula 5 at its terminal.
- the terminal-modified polyamide resin obtained in Examples 30 and 71 contained terminal-modified polyamide having a structure represented by the following chemical formula 4 at its terminal.
- the terminal-modified polyamide resin obtained in Examples 31 and 72 contained a terminal-modified polyamide having a structure represented by the following chemical formula 4 and a structure represented by the chemical formula 8 at its terminal.
- the terminal-modified polyamide resin obtained in Examples 32, 33, 73 and 74 contained a terminal-modified polyamide having a structure represented by the following chemical formula 4 and a structure represented by the chemical formula 9 at its terminal.
- the end-modified polyamide resins obtained in Examples 34 and 75 contained a structure represented by the following chemical formula 4 and a terminal-modified polyamide having a structure represented by the following chemical formula 10 at its ends.
- the terminal-modified polyamide resin obtained in Examples 35 and 76 contained a structure represented by the following chemical formula 6 and a terminal-modified polyamide having a structure represented by the chemical formula 10 at its terminal.
- terminal-modified polyamide resins obtained in Examples 1 to 9, 14 to 29, 36 to 37, 40 to 50, 55 to 70, 77 to 82 include terminal modified polyamides having the structure shown in Example 1 at the terminal. Met.
- the polyamide resins obtained in Comparative Examples 1 to 3, 4 to 6 did not contain terminal-modified polyamide.
- a fiber-reinforced terminal-modified polyamide 6 containing a structure composed of structural units different from the repeating structural units constituting the main chain of the polymer in the terminal group of the polymer It can be seen that the continuous fiber reinforced polyamide resin base material obtained using the resin is excellent in impregnation property and thermal stability during melt residence, and can achieve reduction of voids and improvement of surface quality.
- a comparison between Examples 42 to 82 and Comparative Examples 4 to 6 shows that a fiber reinforced end-modified polyamide 6 containing a structure composed of a structural unit different from the repeating structural unit constituting the main chain of the polymer in the terminal group of the polymer. It can be seen that the discontinuous fiber reinforced polyamide resin substrate obtained by using the resin is excellent in impregnation property and thermal stability during melt residence, and can achieve reduction of voids and improvement of surface quality.
- the fiber-reinforced polyamide resin base material and the molded product thereof according to the first and second aspects of the present invention taking advantage of the excellent characteristics, are aircraft parts, automobile parts, electrical / electronic parts, building members, various containers, daily necessities, daily life. It can be used for various purposes such as general goods and sanitary goods.
- the fiber-reinforced polyamide resin base material and the molded product thereof according to the embodiment of the present invention include, inter alia, aircraft engine peripheral parts, aircraft parts exterior parts, automobile body parts, vehicle skeletons, which require impregnation, heat aging resistance, and surface appearance.
- the fiber-reinforced terminal-modified polyamide resin and the molded product thereof according to the embodiment of the present invention include aircraft engine peripheral parts such as fan blades, landing gear pods, winglets, spoilers, edges, ladders, elevators, and failings.
- Aircraft-related parts such as ribs, various seats, front body, underbody, various pillars, various members, various frames, various beams, various supports, various rails, various hinges, and other automobile body parts, engine covers, air intake pipes, timing Automobile engine peripheral parts such as belt cover, intake manifold, filler cap, throttle body, cooling fan, cooling fan, top and base of radiator tank, cylinder head cover, oil pan Automotive underhood parts such as brake piping, fuel piping tubes, waste gas system parts, etc., automotive gear parts such as gears, actuators, bearing retainers, bearing cages, chain guides, chain tensioners, shift lever brackets, steering lock brackets, key cylinders , Door inner handle, door handle cowl, interior mirror bracket, air conditioner switch, instrument panel, console box, glove box, steering wheel, trim and other automotive interior parts, front fender, rear fender, fuel lid, door panel, cylinder head cover, door mirror Stay, tailgate panel, license garnish, roof rail, engine mount bracket, rear Finish, rear spoiler, trunk lid, rocker
- electronic parts such as
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Abstract
Description
連続した強化繊維に、または不連続の強化繊維が分散した強化繊維基材にポリアミド樹脂を含浸させてなる繊維強化ポリアミド樹脂基材であって、前記ポリアミド樹脂が、ポリアミド樹脂を構成するポリマーの少なくとも一部が、ポリマーの主鎖を構成する繰り返し構造単位とは異なる構造単位から構成される構造をポリマーの末端基に有する末端変性ポリアミド樹脂である繊維強化ポリアミド樹脂基材、である。
アミノ酸、ラクタム、ならびに/もしくは、ジアミンおよびジカルボン酸を重合する際に、下記一般式(III)で表される末端変性用化合物をアミノ酸、ラクタム、ジアミンおよびジカルボン酸の合計に対して1~20質量%含有させて、ポリアミド樹脂の末端に末端変性用化合物を結合させることにより、下記一般式(I)で表される末端構造を1~20質量%含有する末端変性ポリアミド樹脂を得る工程と、連続した強化繊維に、または不連続繊維の強化繊維が分散した強化繊維基材に前記末端変性ポリアミド樹脂を含浸させる工程を少なくとも有する上記繊維強化ポリアミド樹脂基材の製造方法、である。
-X-(R1-O)m-R2 (I)
上記一般式(III)および(I)中、mは2~100の範囲を表す。R1は炭素数2~10の2価の炭化水素基、R2は炭素数1~30の1価の炭化水素基を表す。上記一般式が(III)の場合、-X-は-NH-、-N(CH3)-または-O(C=O)-を表す。上記一般式が(I)の場合、-X-は-NH-、-N(CH3)-または-(C=O)-を表す。一般式(III)中に含まれるm個のR1は同じでも異なってもよい。
上記繊維強化ポリアミド樹脂基材を含む成形品、である。
上記繊維強化ポリアミド樹脂基材と、熱可塑性樹脂を含む成形品とが、少なくとも一部で接合された複合成形品、である。
上記一般式(II)中、R3は炭素数1~30の1価の炭化水素基を表す。前記一般式(I)におけるXが-NH-または-N(CH3)-の場合、上記一般式(II)における-Y-は-(C=O)-を表し、前記一般式(I)におけるXが-(C=O)-の場合、上記一般式(II)におけるYは-NH-または-N(CH3)-を表す。
(Li:測定した繊維長(i=1,2,3,・・・400)(単位:mm))。
上記一般式(I)中、mは2~100(2以上100以下)の範囲を表す。mが大きいほど、溶融粘度の低減効果が効果的に奏される。mは5以上が好ましく、8以上がより好ましく、16以上がさらに好ましい。一方、mが小さいほど、耐熱性をより高く維持することができる。mは70以下が好ましく、50以下がより好ましい。なお、ポリアミド樹脂の主たる構造単位に由来する特性を維持する観点から、本発明における末端変性ポリアミド樹脂は、上記一般式(I)で表される構造をポリマーの末端のみに有することが好ましい。
上記一般式(II)中、R3は炭素数1~30(1以上30以下)の1価の炭化水素基を表す。R3の炭素数が少ないほどポリアミド樹脂の主たる構造単位との親和性に優れるため、炭素数1~30の炭化水素基であることが好ましい。具体的には、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基、ヘプチル基、オクチル基、ノニル基、デシル基、ウンデシル基、トリデシル基、テトラデシル基、ペンタデシル基、ヘキサデシル基、ヘプタデシル基、オクタデシル基、ノナデシル基、イコシル基、エイコシル基、ヘンイコシル基、ヘネイコシル基、ドコシル基、トリコシル基、テトラコシル基、ペンタコシル基、ヘキサコシル基、ヘプタコシル基、オクタコシル基、ノナコシル基、トリアコンチル等の直鎖アルキル基、イソプロピル基、イソブチル基、tert-ブチル基、イソペンチル基、ネオペンチル基等の分岐鎖アルキル基、シクロペンチル基、シクロヘキシル基、シクロヘプチル基等のシクロアルキル基、フェニル基、トリル基等のアリール基、ベンジル基、2-フェニルエチル基等のアラルキル基などが挙げられる。末端変性ポリアミド樹脂の熱安定性および着色防止の観点から、R3は1価の炭素数1以上20以下の飽和炭化水素基またはアリール基であることがさらに好ましい態様である。
(1)ポリアミド樹脂、末端変性用化合物、および必要に応じてその他の成分を、ポリアミド樹脂の融点以上において溶融混練し、反応せしめる方法や、これらを溶液中において混合し、反応せしめた後に溶媒を除く方法、および(2)ポリアミド樹脂の主たる構造単位を構成する原料(ポリアミド樹脂の主たる原料)、末端変性用化合物、および必要に応じてその他の成分を添加して反応させる方法(反応時添加方法)などが挙げられる。
上記一般式(V)において、Aは炭素原子数1~12のアルキレン基または炭素数6~24のアリーレン基を表す。aは炭素原子と水素原子以外の原子または単結合を表す。rは(a-A)で表される構造単位の繰り返し数を表し、1以上である。Wは、水酸基、アルデヒド基、カルボキシル基、スルホ基、アミノ基、グリシジル基、イソシアネート基、カルボジイミド基、オキサゾリン基、オキサジン基、エステル基、アミド基、シラノール基またはシリルエーテル基を表す。
上記一般式(III)中、nは2~100の範囲を表す。前記一般式(I)におけるmと同様に、5以上が好ましく、8以上がより好ましく、16以上がさらに好ましい。一方、nは70以下が好ましく、50以下がより好ましい。R1は炭素数2~10の2価の炭化水素基、R2は炭素数1~30の1価の炭化水素基を表す。それぞれ、一般式(I)におけるR1およびR2として例示したものが挙げられる。X-は-NH-、-N(CH3)-または-O(C=O)-を示す。ポリアミドの末端との反応性に優れる-NH-がより好ましい。
上記一般式(IV)中、R3は炭素数1~30の1価の炭化水素基を表す。前記一般式(II)と同様に、末端変性ポリアミド樹脂の熱安定性および着色防止の観点から、R3は1価の飽和炭化水素基がさらに好ましい。前記一般式(III)におけるXが-NH-または-N(CH3)-の場合、上記一般式(IV)における-Y-は-O(C=O)-を表し、前記一般式(III)におけるXが-O(C=O)-の場合、上記一般式(IV)におけるYは-NH-または-N(CH3)-を表す。
(1)ポリアミド樹脂と末端変性用化合物とを溶融混練することにより末端変性ポリアミド樹脂を製造する場合には、溶融混練温度をポリアミド樹脂の融点(Tm)よりも10℃以上40℃以下高い温度で反応させることが好ましい。例えば、押出機を用いて溶融混練する場合、押出機のシリンダー温度を前記範囲とすることが好ましい。溶融混練温度をこの範囲にすることで、末端変性用化合物の揮発、ポリアミド樹脂の分解を抑制しつつ、ポリアミド樹脂の末端と末端変性用化合物とを効率的に結合させることができる。ポリアミド樹脂としては、前述のポリアミド樹脂が例示される。
(2)ポリアミド樹脂の原料と末端変性用化合物とを重合時に反応させる方法により末端変性ポリアミド樹脂を製造する場合には、ポリアミド樹脂の融点以上で反応させる溶融重合法、ポリアミド樹脂の融点未満で反応させる固相重合法のいずれを用いてもよい。ポリアミド樹脂を与える原料としては、前述のアミノ酸、ラクタムおよび「ジアミンとジカルボン酸との混合物」が例示される。
ρf:強化繊維の密度(g/cm3)
ρr:末端変性ポリアミド樹脂の密度(g/cm3)
また、本発明の実施形態の繊維強化ポリアミド樹脂基材は、その用法や目的に応じて、所望の含浸性を選択することができる。例えば、より含浸性を高めたプリプレグや、半含浸のセミプレグ、含浸性の低いファブリックなどが挙げられる。一般的に、含浸性の高い成形材料ほど、短時間の成形で力学特性に優れる成形品が得られるため好ましい。
本発明の第二の態様における、不連続繊維が分散した強化繊維基材に末端変性ポリアミド樹脂を含浸させる方法としては、例えば、末端変性ポリアミド樹脂を押出機により供給して強化繊維基材に含浸させる方法、粉末の末端変性ポリアミド樹脂を強化繊維基材の繊維層に分散し溶融させる方法、末端変性ポリアミド樹脂をフィルム化して強化繊維基材とラミネートする方法、末端変性ポリアミド樹脂を溶剤に溶かし溶液の状態で強化繊維基材に含浸させた後に溶剤を揮発させる方法、末端変性ポリアミド樹脂を繊維化して不連続繊維との混合糸にする方法、末端変性ポリアミド樹脂の前駆体を強化繊維基材に含浸させた後に重合させて末端変性ポリアミド樹脂にする方法、メルトブロー不織布を用いてラミネートする方法などが挙げられる。いずれの方法を用いてもよいが、末端変性ポリアミド樹脂を押出機により供給して強化繊維基材に含浸させる方法は、末端変性ポリアミド樹脂を加工する必要がないという利点があり、粉末の末端変性ポリアミド樹脂を強化繊維基材の繊維層に分散し溶融させる方法は、含浸がしやすいという利点があり、末端変性ポリアミド樹脂をフィルム化して強化繊維基材とラミネートする方法は、比較的品質の良いものが得られるという利点がある。
各実施例および比較例により得られた繊維強化ポリアミド樹脂基材の質量W0を測定したのち、該繊維強化ポリアミド樹脂基材を空気中500℃で30分間加熱してポリアミド樹脂成分を焼き飛ばし、残った強化繊維の質量W1を測定し、下記式(VI)により繊維強化ポリアミド樹脂基材の体積含有率(Vf)を算出した。
ρf:強化繊維の密度(g/cm3)
ρr:末端変性ポリアミド樹脂の密度(g/cm3)
[相対粘度(ηr)]
各実施例および比較例により得られた末端変性ポリアミド樹脂またはポリアミド樹脂の、樹脂濃度0.01g/mLの98%硫酸溶液について、25℃でオストワルド式粘度計を用いて相対粘度を測定した。
各実施例および比較例により得られた末端変性ポリアミド樹脂またはポリアミド樹脂2.5mgを、ヘキサフルオロイソプロパノール(0.005N-トリフルオロ酢酸ナトリウム添加)4mlに溶解し、得られた溶液を0.45μmのフィルターでろ過した。得られた溶液を用いて、GPC測定により数平均分子量(Mn)および重量平均分子量(Mw)(溶融滞留前重量平均分子量)を測定した。測定条件を以下に示す。
検出器:示差屈折率計 Waters 2414(Waters製)
カラム:Shodex HFIP-806M(2本)+HFIP-LG
溶媒:ヘキサフルオロイソプロパノール(0.005N-トリフルオロ酢酸ナトリウム添加)
流速:1mL/min
試料注入量:0.1mL
温度:30℃
分子量基準物質:ポリメチルメタクリレート。
各実施例および比較例により得られた末端変性ポリアミド樹脂またはポリアミド樹脂0.5gを精秤し、フェノール/エタノール混合溶液(比率:83.5/16.5質量比)25mLを加えて室温で溶解した後、チモールブルーを指示薬として、0.02規定の塩酸で滴定してアミノ末端基量(mol/t)を求めた。
各実施例および比較例により得られた末端変性ポリアミド樹脂またはポリアミド樹脂0.5gを精秤し、ベンジルアルコール20mLを加えて195℃の温度で溶解した後、フェノールフタレインを指示薬として、0.02規定の水酸化カリウムのエタノール溶液を用いて、195℃の状態で滴定してカルボキシル末端基量(mol/t)を求めた。
実施例および比較例により得られた末端変性ポリアミド樹脂またはポリアミド樹脂について、日本電子(株)製FT-NMR:JNM-AL400を用いて1H-NMR測定を実施した。まず、測定溶媒として重水素化硫酸を用いて、試料濃度50mg/mLの溶液を調製した。積算回数256回にて、ポリアミド樹脂の1H-NMR測定を実施した。一般式(I)で表される末端構造におけるR1およびR2由来部分のピーク、一般式(II)で表される末端構造におけるR3部分由来のピークおよびポリアミド樹脂骨格の繰り返し構造単位由来のピークを同定した。各ピークの積分強度を算出し、算出した積分強度と、それぞれの構造単位中の水素原子数とから、末端変性ポリアミド樹脂における一般式(I)で表される末端構造の含有量[I](mol/t、質量%)(滞留前含有量)および一般式(II)で表される末端構造の含有量[II](mol/t、質量%)をそれぞれ算出した。
TAインスツルメント社製示差走査熱量計(DSC Q20)を用いて、各実施例および比較例により得られた末端変性ポリアミド樹脂またはポリアミド樹脂5~7mgを秤量し、窒素雰囲気下、20℃から昇温速度20℃/minで250℃まで昇温した。昇温したときに現れる吸熱ピークの頂点をTm(融点)とした。
各実施例および比較例により得られた末端変性ポリアミド樹脂またはポリアミド樹脂を、80℃真空乾燥器中で12時間以上乾燥した。溶融粘度の測定装置として、キャピラリーフローメーター((株)東洋精機製作所製、キャピログラフ1C型)を用いて、径0.5mm、長さ5mmのオリフィスにて、融点+60℃、せん断速度9,728sec-1の条件で溶融粘度(滞留前溶融粘度)を測定した。ただし、末端変性ポリアミド樹脂またはポリアミド樹脂を溶融させるため、5分間滞留させた後に測定を行った。この溶融粘度の値が小さいほど、高い流動性を有することを示す。
各実施例および比較例により得られた末端変性ポリアミド樹脂またはポリアミド樹脂を、80℃真空乾燥器中で12時間以上乾燥した。キャピラリーフローメーター((株)東洋精機製作所製、キャピログラフ1C型)を用いて、径0.5mm、長さ5mmのオリフィスにて、融点+60℃で60分間溶融滞留後、せん断速度9,728sec-1の条件で溶融粘度(滞留後溶融粘度)を測定した。前述の方法により測定した溶融粘度(滞留前溶融粘度)と溶融粘度(滞留後溶融粘度)から、(滞留後溶融粘度/滞留前溶融粘度)×100により溶融粘度保持率[%]を算出した。
各実施例および比較例により得られた末端変性ポリアミド樹脂またはポリアミド樹脂を、80℃真空乾燥器中で12時間以上乾燥した。キャピラリーフローメーター((株)東洋精機製作所製、キャピログラフ1C型)を用いて、径0.5mm、長さ5mmのオリフィスにて、融点+60℃で60分間溶融滞留を行った。溶融滞留後の末端変性ポリアミド樹脂またはポリアミド樹脂について、前述の分子量測定方法と同様のGPC測定により重量平均分子量(Mw)(滞留後重量平均分子量)を測定した。前述の方法により測定した重量平均分子量(溶融滞留前重量平均分子量)と重量平均分子量(滞留後重量平均分子量)から、(滞留後重量平均分子量/滞留前重量平均分子量)×100により重量平均分子量保持率[%]を算出した。
各実施例および比較例により得られた末端変性ポリアミド樹脂またはポリアミド樹脂を、80℃真空乾燥器中で12時間以上乾燥した。キャピラリーフローメーター((株)東洋精機製作所製、キャピログラフ1C型)を用いて、径0.5mm、長さ5mmのオリフィスにて、融点+60℃で60分間溶融滞留を行った。溶融滞留後の末端変性ポリアミド樹脂またはポリアミド樹脂について、前述の末端構造含有量測定方法と同様の1H-NMR測定により末端変性ポリアミド樹脂における一般式(I)で表される末端構造の含有量[I](mol/t)(滞留後含有量)を算出した。前述の方法により測定した一般式(I)で表される末端構造の含有量[I](mol/t)(滞留前含有量)と一般式(I)で表される末端構造の含有量[I](mol/t)(滞留後含有量)から、(滞留後含有量/滞留前含有量)×100により含有量保持率を算出した。
各実施例および比較例により得られた末端変性ポリアミド樹脂またはポリアミド樹脂を、80℃真空乾燥器中で12時間以上乾燥した。任意部分を20mg切り出し、熱重量分析装置(パーキンエルマー社製、TGA7)を用い、窒素ガス雰囲気下、末端変性ポリアミド樹脂またはポリアミド樹脂の融点+60℃の温度で40分間保持し、熱処理前後の重量減少率[%]を測定した。
各実施例および比較例により得られた末端変性ポリアミド樹脂またはポリアミド樹脂を、80℃真空乾燥器中で12時間以上乾燥した。東芝機械(株)製IS55EPN射出成形機を用いて、シリンダー温度は、末端変性ポリアミド樹脂またはポリアミド樹脂の融点(Tm)+60℃とし、金型温度は80℃とし、射出時間と保圧時間は合わせて10秒、冷却時間は10秒の成形サイクル条件で、試験片厚み1/25インチ(約1.0mm)のASTM4号ダンベルの評価用試験片を射出成形した。得られたASTM4号ダンベル型試験片を、“テンシロン”(登録商標)UTA-2.5T(オリエンテック社製)に供し、ASTM-D638に準じて、23℃、湿度50%の雰囲気下で、歪み速度10mm/minで引張試験を行い、引張破断伸度を測定した。
各実施例および比較例により得られた繊維強化ポリアミド樹脂基材の厚み方向断面を以下のように観察した。繊維強化末端変性ポリアミド樹脂をエポキシ樹脂で包埋したサンプルを用意し、繊維強化末端変性ポリアミド樹脂の厚み方向断面が良好に観察できるようになるまで、前記サンプルを研磨した。研磨したサンプルを、超深度カラー3D形状測定顕微鏡VHX-9500(コントローラー部)/VHZ-100R(測定部)((株)キーエンス製)を使用して、拡大倍率400倍で撮影した。撮影範囲は、繊維強化末端変性ポリアミド樹脂の厚み×幅500μmの範囲とした。撮影画像において、樹脂が占める部位の面積および空隙(ボイド)となっている部位の面積を求め、次式により含浸率を算出した。
含浸性および熱安定性が高い場合はボイドが低減され、含浸性または熱安定性の少なくとも一方が低い場合はボイドが増加することから、繊維強化ポリアミド樹脂基材の含浸性および熱安定性は、この含浸率を判断基準とし、以下の2段階で評価し、良を合格とした。第一の態様における繊維強化ポリアミド樹脂基材は、融点+30℃、60℃、100℃の加工温度にて製造した。第二の態様における繊維強化ポリアミド樹脂基材は、融点+10℃、20℃、30℃の加工温度にて製造した。
良:含浸率が98%以上である。
各実施例および比較例により得られた繊維強化末端変性ポリアミド樹脂または繊維強化ポリアミド樹脂基材の表面品位を目視により観察した。表面品位は、以下の2段階で評価し、良を合格とした。
不良:表面にわれ、マトリックス樹脂の変色、強化繊維の露出有り
第一の態様における繊維強化ポリアミド樹脂基材は、融点+30℃、60℃、100℃の加工温度にて製造した。第二の態様における繊維強化ポリアミド樹脂基材は、融点+10℃、20℃、30℃の加工温度にて製造した。
実施例および比較例において、原料は以下に示すものを用いた。
炭素繊維束:東レ(株)製 T700S-12K
・ε-カプロラクタム:和光純薬工業(株)製、和光特級。
・下記の構造式(化学式1)で表されるメトキシポリ(エチレングリコール)ポリ(プロピレングリコール)アミン:HUNTSMAN製“JEFFAMINE”(登録商標)M1000(数平均分子量Mn1,000)。
・安息香酸:和光純薬工業(株)製、試薬特級
・酢酸:和光純薬工業(株)製、試薬特級
・ステアリン酸:和光純薬工業(株)製、試薬特級
・セロチン酸:東京化成工業(株)製。
[実施例1]
ε-カプロラクタム20g、イオン交換水20g、“JEFFAMINE”M1000を1.6g、安息香酸0.14gを反応容器に仕込み密閉し、窒素置換した。反応容器外周にあるヒーターの設定温度を290℃とし、加熱を開始した。缶内圧力が1.0MPaに到達した後、水分を系外へ放出させながら缶内圧力1.0MPaに保持し、缶内温度が240℃になるまで昇温した。缶内温度が240℃に到達した後、ヒーターの設定温度を270℃に変更し、1時間かけて常圧となるよう缶内圧力を調節した(常圧到達時の缶内温度:243℃)。続けて、缶内に窒素を流しながら(窒素フロー)240分間保持して末端変性ポリアミド6樹脂を得た(最高到達温度:253℃)。続いて得られた末端変性ポリアミド6樹脂を、イオン交換水でソックスレー抽出を行い、未反応の末端変性用化合物を除去した。このようにして得られた末端変性ポリアミド6樹脂の相対粘度は1.81、重量平均分子量は3.0万、融点(Tm)は220℃、溶融粘度は5.5Pa・sであった。また、得られた末端変性ポリアミド6樹脂は以下の化学式4にて示される構造と以下の化学式5で示される構造を末端に有する末端変性ポリアミド6樹脂を含むものであった。その他の物性を表1に示す。
[実施例2~39、比較例1~3]
原料を表1~5に示す組成に変更し、かつ缶内圧力を常圧とした後、缶内に窒素を流しながら保持する時間(窒素フロー時間)を表1~5に示す時間に変更したこと以外は実施例1と同様にして末端変性ポリアミド6樹脂を得た。実施例1により得られた末端変性ポリアミド6樹脂にかえて、各実施例および比較例により得られた末端変性ポリアミド6樹脂またはポリアミド6樹脂を用いたこと以外は実施例1と同様にして繊維強化ポリアミド樹脂基材を得た。得られた末端変性ポリアミド6樹脂の物性および、繊維強化ポリアミド樹脂基材の物性を表1~5に示す。
[実施例40]
ヘキサメチレンジアミン9.46g、アジピン酸11.92g、イオン交換水20g、“JEFFAMINE”(登録商標)M1000を1.6g、安息香酸0.14gを反応容器に仕込み密閉し、窒素置換した。反応容器外周にあるヒーターの設定温度を290℃とし、加熱を開始した。缶内圧力が1.75MPaに到達した後、水分を系外へ放出させながら缶内圧力1.75MPaに保持し、缶内温度が260℃になるまで昇温した。缶内温度が260℃に到達した後、ヒーターの設定温度を290℃に変更し、1時間かけて常圧となるよう缶内圧力を調節した(常圧到達時の缶内温度:270℃)。続けて、缶内に窒素を流しながら(窒素フロー)240分間保持して末端変性ポリアミド66樹脂を得た(最高到達温度:275℃)。ここで、得られたポリアミド樹脂は実施例1で示す構造を末端に有する末端変性ポリアミド66樹脂を含むものであった。
加工温度を320℃とした以外は実施例1と同様にして、得られた末端変性ポリアミド66樹脂を用いて繊維強化ポリアミド66樹脂基材を得た。得られた末端変性ポリアミド66樹脂の物性および繊維強化ポリアミド66樹脂基材の物性を表6に示す。
[実施例41]
ヘキサメチレンジアミン7.74g、セバシン酸13.46g、イオン交換水20g、“JEFFAMINE”(登録商標)M1000を1.6g、安息香酸0.14gを反応容器に仕込み密閉し、窒素置換した。反応容器外周にあるヒーターの設定温度を290℃とし、加熱を開始した。缶内圧力が1.0MPaに到達した後、水分を系外へ放出させながら缶内圧力1.0MPaに保持し、缶内温度が240℃になるまで昇温した。缶内温度が240℃に到達した後、ヒーターの設定温度を290℃に変更し、1時間かけて常圧となるよう缶内圧力を調節した(常圧到達時の缶内温度:243℃)。続けて、缶内に窒素を流しながら(窒素フロー)240分間保持して末端変性ポリアミド610樹脂を得た(最高到達温度:253℃)。ここで、得られたポリアミド樹脂は以下の実施例1で示す構造を末端に有する末端変性ポリアミド610樹脂を含むものであった。
[実施例42]
実施例1と同様にして末端変性ポリアミド樹脂を得た。得られた末端変性ポリアミド樹脂を押出機に投入し、溶融混練した後フィルムダイから膜状に押出し、樹脂フィルムを得た。
[実施例43~80、比較例4~6]
原料を表7~11に示す組成に変更し、かつ缶内圧力を常圧とした後、缶内に窒素を流しながら保持する時間(窒素フロー時間)を表7~11に示す時間に変更したこと以外は実施例40と同様にして末端変性ポリアミド6樹脂を得た。実施例42により得られた末端変性ポリアミド6樹脂にかえて、各実施例および比較例により得られた末端変性ポリアミド6樹脂またはポリアミド6樹脂を用いたこと以外は実施例42と同様にして繊維強化ポリアミド樹脂基材を得た。得られた末端変性ポリアミド6樹脂の物性および、繊維強化ポリアミド樹脂基材の物性を表7~11に示す。
[実施例81]
実施例40と同様にして末端変性ポリアミド66樹脂を得た。加工温度を290℃とした以外は実施例42と同様にして、得られた末端変性ポリアミド610樹脂を用いて繊維強化ポリアミド610樹脂基材を得た。得られた末端変性ポリアミド610樹脂の物性および繊維強化ポリアミド610樹脂基材の物性を表12に示す。
[実施例82]
実施例41と同様にして末端変性ポリアミド610樹脂を得た。加工温度を250℃とした以外は実施例42と同様にして、得られた末端変性ポリアミド610樹脂を用いて繊維強化ポリアミド610樹脂基材を得た。得られた末端変性ポリアミド610樹脂の物性および繊維強化ポリアミド610樹脂基材の物性を表12に示す。
Claims (17)
- 連続した強化繊維に、または不連続の強化繊維が分散した強化繊維基材にポリアミド樹脂を含浸させてなる繊維強化ポリアミド樹脂基材であって、前記ポリアミド樹脂が、ポリアミド樹脂を構成するポリマーの少なくとも一部が、ポリマーの主鎖を構成する繰り返し構造単位とは異なる構造単位から構成される構造をポリマーの末端基に有する末端変性ポリアミド樹脂である繊維強化ポリアミド樹脂基材。
- 前記末端変性ポリアミド樹脂が、下記一般式(I)で表される末端構造を1~20質量%含有する請求項1に記載の繊維強化ポリアミド樹脂基材。
-X-(R1-O)m-R2 (I)
上記一般式(I)中、mは2~100の範囲を表す。R1は炭素数2~10の2価の炭化水素基、R2は炭素数1~30の1価の炭化水素基を表す。-X-は-NH-、-N(CH3)-または-(C=O)-を表す。一般式(I)中に含まれるm個のR1は同じでも異なってもよい。 - 前記末端変性ポリアミド樹脂が、さらに下記一般式(II)で表される末端構造を0.1~5質量%含有する請求項2に記載の繊維強化ポリアミド樹脂基材。
-Y-R3 (II)
上記一般式(II)中、R3は炭素数1~30の1価の炭化水素基を表す。前記一般式(I)におけるXが-NH-または-N(CH3)-の場合、上記一般式(II)における-Y-は-(C=O)-を表し、前記一般式(I)におけるXが-(C=O)-の場合、上記一般式(II)におけるYは-NH-または-N(CH3)-を表す。 - 前記強化繊維が一方向に連続して配列している、または、数平均繊維長が3~100mmの不連続繊維である請求項1~3のいずれかに記載の繊維強化ポリアミド樹脂基材。
- 前記強化繊維が炭素繊維を含み、強化繊維を20~70体積%含有する請求項1~4のいずれかに記載の繊維強化ポリアミド樹脂基材。
- 前記末端変性ポリアミド樹脂が、前記一般式(I)で表される末端構造と前記一般式(II)で表される末端構造を合計60~250[mol/t]含有し、かつ前記一般式(I)で表される末端構造の含有量[mol/t]と前記一般式(II)で表される末端構造の含有量[mol/t]の比((I)/(II))が0.3~2.5である請求項1~5のいずれかに記載の繊維強化ポリアミド樹脂基材。
- 前記末端変性ポリアミド樹脂が、アミノ末端基とカルボキシル末端基を合計50~150[mol/t]含有し、かつアミノ末端基の含有量[mol/t]とカルボキシル末端基の含有量[mol/t]の比(アミノ末端基/カルボキシル末端基)が0.5~2.5である請求項1~6のいずれかに記載の繊維強化ポリアミド樹脂基材。
- 前記末端変性ポリアミド樹脂の、樹脂濃度0.01g/mLの98%硫酸溶液の25℃における相対粘度(ηr)が1.3~3.0である請求項1~7のいずれかに記載の繊維強化ポリアミド樹脂基材。
- 前記末端変性ポリアミド樹脂の、ゲルパーミエーションクロマトグラフィーにより測定した重量平均分子量Mwが15,000~50,000である請求項1~8のいずれかに記載の繊維強化ポリアミド樹脂基材。
- 前記末端変性ポリアミド樹脂の、融点+60℃、せん断速度9,728sec-1の条件における溶融粘度が30Pa・s以下である請求項1~9のいずれかに記載の繊維強化ポリアミド樹脂基材。
- 前記末端変性ポリアミド樹脂の、融点+60℃の条件下60分間滞留前後における前記一般式(I)で表される末端構造の含有量保持率((滞留後含有量/滞留前含有量)×100)が80%以上である請求項1~10のいずれかに記載の繊維強化ポリアミド樹脂基材。
- 前記末端変性ポリアミド樹脂の、融点+60℃の条件下60分間滞留前後における重量平均分子量保持率((滞留後重量平均分子量/滞留前重量平均分子量)×100)が80%~120%である請求項1~11のいずれかに記載の繊維強化ポリアミド樹脂基材。
- 前記末端変性ポリアミド樹脂の、融点+60℃の条件下60分間滞留前後における溶融粘度保持率((滞留後溶融粘度/滞留前溶融粘度)×100)が80%~120%である請求項1~12のいずれかに記載の繊維強化ポリアミド樹脂基材。
- 前記末端変性ポリアミド樹脂の、窒素雰囲気下、融点+60℃の条件下40分間滞留前後における重量減少率が4%以下である請求項1~13のいずれかに記載の繊維強化ポリアミド樹脂基材。
- アミノ酸、ラクタム、ならびに/もしくは、ジアミンおよびジカルボン酸を重合する際に、下記一般式(III)で表される末端変性用化合物をアミノ酸、ラクタム、ジアミンおよびジカルボン酸の合計に対して1~20質量%含有させて、ポリアミド樹脂の末端に末端変性用化合物を結合させることにより、下記一般式(I)で表される末端構造を1~20質量%含有する末端変性ポリアミド樹脂を得る工程と、連続した強化繊維に、または不連続の強化繊維が分散した強化繊維基材に前記末端変性ポリアミド樹脂を含浸させる工程を少なくとも有する請求項2~14のいずれかに記載の繊維強化ポリアミド樹脂基材の製造方法。
H-X-(R1-O)m-R2 (III)
-X-(R1-O)m-R2 (I)
上記一般式(III)および(I)中、mは2~100の範囲を表す。R1は炭素数2~10の2価の炭化水素基、R2は炭素数1~30の1価の炭化水素基を表す。上記一般式が(III)の場合、-X-は-NH-、-N(CH3)-または-O(C=O)-を表す。上記一般式が(I)の場合、-X-は-NH-、-N(CH3)-または-(C=O)-を表す。一般式(III)中に含まれるm個のR1は同じでも異なってもよい。 - 請求項1~15のいずれかに記載の繊維強化ポリアミド樹脂基材を含む成形品。
- 請求項1~14のいずれかに記載の繊維強化ポリアミド樹脂基材と、熱可塑性樹脂を含む成形品とが、少なくとも一部で接合された複合成形品。
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