WO2020189503A1 - Composition de résine polyamide - Google Patents

Composition de résine polyamide Download PDF

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Publication number
WO2020189503A1
WO2020189503A1 PCT/JP2020/010827 JP2020010827W WO2020189503A1 WO 2020189503 A1 WO2020189503 A1 WO 2020189503A1 JP 2020010827 W JP2020010827 W JP 2020010827W WO 2020189503 A1 WO2020189503 A1 WO 2020189503A1
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WIPO (PCT)
Prior art keywords
polyamide resin
mass
resin composition
polyamide
talc
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PCT/JP2020/010827
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English (en)
Japanese (ja)
Inventor
英王 阿曽
久保田　修司
鮎澤　佳孝
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東洋紡株式会社
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Priority to JP2021507279A priority Critical patent/JPWO2020189503A1/ja
Publication of WO2020189503A1 publication Critical patent/WO2020189503A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers

Definitions

  • the present invention relates to a polyamide resin composition filled with granular inorganic substances, and more specifically, provides a molding material in which bulky fine granular inorganic substances are uniformly filled in a polyamide resin and mechanical properties, heat resistance, dimensional stability, etc. are significantly improved.
  • the polyamide resin composition can be applied to automobile interior parts such as consoles and cup holders, and a wide range of applications not limited thereto.
  • Polyamides represented by nylon 6 and nylon 66 are originally excellent in mechanical properties such as tensile strength and impact strength, and electrical properties. Therefore, as engineering plastics, they are widely used in mechanical parts such as rollers, gears, bearings, and electrical parts. It is used. However, in general, polyamide has a low thermal deformation temperature and causes dimensional changes and a significant decrease in rigidity due to water absorption, so its use is restricted in applications where frequent contact with water occurs, applications exposed to high temperature conditions, etc. ing.
  • polyamide In order to improve such defects of polyamide, polyamide has been reinforced with glass fiber or granular inorganic substances.
  • glass fiber-reinforced polyamides improve thermal properties such as tensile strength and thermal deformation temperature, significant anisotropy of strength occurs and glass fibers and the like emerge on the surface, impairing surface smoothness. Become.
  • Patent Document 1 A method of kneading a mixture of agents has been proposed (Patent Document 1).
  • Patent Document 1 since a high-viscosity polyamide resin having a relative viscosity of more than 3 is used, the fluidity is low, which makes it difficult to manufacture a molded product having a large flow resistance such as a thin wall or a complicated shape. When is used, there is a problem that the mechanical properties are extremely deteriorated, the molding shrinkage rate is increased, and the range of application is narrowed.
  • the present invention has been made to solve such a problem, and an object of the present invention is to have high mechanical strength and low molding shrinkage even in a highly fluid talc-reinforced polyamide resin composition using low-viscosity polyamide.
  • the present inventors have conducted diligent studies to obtain the same mechanical strength and molding shrinkage rate as when using a high-viscosity polyamide resin in a talc-reinforced polyamide resin composition even when using a low-viscosity polyamide resin. As a result, it was found that the mechanical properties and the molding shrinkage were not related to the viscosity of the polyamide resin but to the particle size of the talc-dispersed phase in the composition.
  • a polyamide resin composition containing (A) 54 to 75% by mass of a polyamide resin, (B) 24 to 45% by mass of talc, and (C) 0.01 to 1% by mass of a silane coupling agent.
  • the polyamide resin composition is characterized in that the melt mass flow rate (MFR) at a water content of 0.05% by mass or less is 15 g / 10 minutes or more and less than 75 g / 10 minutes, and the bending strength is 120 MPa or more.
  • MFR melt mass flow rate
  • the (A) polyamide resin has 70 to 99.5 parts by mass of (a1) polyamide 6 and 0.5 to 30 parts by mass of (a2) polyamide MXD6, assuming that the (A) polyamide resin is 100 parts by mass.
  • the polyamide resin composition of the present invention can exhibit a dramatic improvement in mechanical strength even when a low-viscosity polyamide resin is used, and can ensure good moldability.
  • the polyamide resin (A) is a polymer having an amide bond (-NHCO-) in the main chain.
  • the polyamide resin (A) is preferably crystalline, and for example, polyamide 6 (PA6), polyamide 66 (PA66), polyamide 46 (PA46), polyamide 11 (PA11), polyamide 12 (PA12), polyamide 610 (PA610).
  • PA612 Polyamide 612
  • PAMXD6 Polymethaxylylene adipamide
  • PA6T Hexamethylenediamine-terephthalic acid polymer
  • PA6T / 66 Hexamethylenediamine-terephthalic acid / adipic acid copolymer
  • PA6T / 6 Hexamethylene Diamine-terephthalic acid and ⁇ -caprolactam copolymer
  • PATMDT trimethylhexamethylenediamine-terephthalic acid polymer
  • PATMXD6 / MXDI tri One or more crystalline polyamide resins such as hexamethylenediamine-terephthalic acid and ⁇ -caprolactam copolymer (PATMDT / 6), diaminodicyclohexylenemethane (CA) and isophthalic acid and lauryllactam copolymers
  • PATMDT / 6 Polyamide 612
  • PAMXD6 Polymethaxylylene adip
  • the relative viscosity (96% sulfuric acid method) of the polyamide resin (A) is not particularly limited, but is preferably 2.0 to 3.0, more preferably 2.0 to 2.8, and even more preferably 2. It is .1 to 2.6. If the relative viscosity is less than 2.0, burrs tend to appear during injection molding and the impact resistance tends to decrease, while if it exceeds 3.0, the fluidity tends to decrease. When a plurality of types of polyamide resins are used in combination as the (A) polyamide resin, it is desirable that all the polyamide resins satisfy this relative viscosity range, but the weighted average of the relative viscosity calculated from the content ratio of the polyamide resins used together is used. (A) The relative viscosity of the polyamide resin may be used.
  • the blending (content) amount of the (A) polyamide resin is 54 to 75% by mass, preferably 56 to 74% by mass, and more preferably 60 to 68% by mass in the polyamide resin composition. If it is less than 54% by mass, it is difficult to uniformly disperse (B) talc, and performance such as mechanical properties becomes unstable. If it exceeds 75% by mass, the effect of improving impact resistance is small.
  • the (A1) polyamide resin contains (a1) polyamide 6 as a main component
  • (a2) polyamide which delays the crystallization of (a1), from the viewpoint of moldability.
  • the (a2) polyamide is not particularly limited as long as it can delay the crystallization of the (a1) polyamide 6, but for example, a polyamide having a higher crystallization temperature than the (a1) polyamide 6 or a polyamide that morphologically inhibits crystallization. Can be used.
  • polyamide MXD6 polymethaxylylene adipamide
  • the blending (content) amount is 70 to 99.5 parts by mass for (a1) polyamide 6 and 0.5 to 30 parts by mass for (a2) polyamide MXD6 when (A) polyamide resin is 100 parts by mass. It is more preferable that (a1) polyamide 6 is 80 to 95 parts by mass and (a2) polyamide MXD6 is 5 to 20 parts by mass.
  • the production method of (B) talc is not particularly limited as long as it is a layered mineral containing hydrated magnesium silicate as a main component, which is obtained by pulverizing talc.
  • the true specific gravity is about 2.7, and the aspect ratio is usually 5 to 20. Further, a part of magnesium atoms in this composition may be replaced with calcium atoms.
  • Talc can be stratified and defined according to its weight average particle size. There are various methods for measuring the weight average particle size, but in recent years, the laser diffraction / scattering method using laser light has been widely used because of its high measurement accuracy.
  • the average primary particle size of talc is not particularly limited, but is preferably 0.1 to 20 ⁇ m, and more preferably 1 to 15 ⁇ m. If it is less than 0.1 ⁇ m, the reinforcing agent effect is hard to be exhibited, and for example, the effect of improving mechanical strength is small. On the other hand, if it exceeds 20 ⁇ m, the appearance of the molded product tends to deteriorate.
  • the apparent specific gravity of (B) talc is not particularly limited, but is preferably 0.05 to 1.5, more preferably 0.1 to 1.0, and even more preferably 0.2 to 0.8. Is. If it is less than 0.05, it becomes difficult to knead it into the resin, and it becomes easy to fly up during handling, which worsens the working environment. On the other hand, if it exceeds 1.5, the specific surface area tends to be small and the effect of the nuclear agent tends to decrease.
  • (B) talc can be used alone or in combination of two or more.
  • the blending (content) content of (B) talc is 24 to 45% by mass, preferably 25 to 43% by mass, and more preferably 31 to 39% by mass in the polyamide resin composition. If it is less than 24% by mass, the effect of improving impact resistance is small, and if it exceeds 45% by mass, uniform dispersion in the polyamide resin is difficult, and performance such as mechanical properties tends to be unstable.
  • the silane-based coupling agent (C) is a compound having a structural formula represented by the following formula (1).
  • X is an atomic group that can react with OH or water to change to OH, and specifically, is a halogen, or a methoxy group or an ethoxy group.
  • silane coupling agent examples include ⁇ -aminopropyltriethoxysilane, n- ⁇ -aminoethyl- ⁇ -aminoproprutrimethoxysilane, and n- ⁇ -aminoethyl- ⁇ -aminoproplmethyl. Examples thereof include dimethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, and ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane. In addition, two or more kinds of silane-based coupling agents can be used together.
  • the blending (content) amount of the silane coupling agent (C) is 0.01 to 1% by mass, more preferably 0.05 to 0.8% by mass, still more preferably 0.1 in the polyamide resin composition. ⁇ 0.5% by mass. Further, it is preferably 0.1 to 4.0% by mass, more preferably 0.2 to 2.0% by mass with respect to (B) talc.
  • a dispersed phase composed of (B) talc is present in the polyamide resin composition, and the average secondary particle size thereof is less than 30 ⁇ m.
  • the average secondary particle size of the dispersed phase is more preferably less than 25 ⁇ m, still more preferably less than 20 ⁇ m.
  • the lower limit of the average secondary particle size of the dispersed phase is (B) the primary particle size of talc (the average particle size of the primary particles (single particle dispersion)), which is about 0.1 ⁇ m.
  • the average particle size of the secondary particles of (B) talc in the polyamide resin composition is more preferably 5 ⁇ m or more, and more preferably 10 ⁇ m or more. Is even more preferable.
  • the average secondary particle size of the dispersed phase is determined by observing the cross section of the molded product obtained by injection molding the polyamide resin composition with a scanning electron microscope (SEM) to determine the talc present in the polyamide resin composition. It is a value obtained by a method of measuring the particle size of 100 agglomerated particles and calculating the average thereof. Specifically, it is a value obtained by measuring 500 maximum lengths of secondary particles having a maximum length larger than the average primary particle size of talc and averaging the maximum lengths of the top 100 secondary particles.
  • SEM scanning electron microscope
  • talc Normally, adding talc to a polyamide resin improves mechanical properties, but if the average secondary particle size of the dispersed phase composed of (B) talc is less than 30 ⁇ m, the mechanical properties, especially bending strength and tensile strength, are improved. Mechanical strength such as strength and deflection temperature under load are dramatically improved. Further, the molding shrinkage rate tends to be small.
  • the rising temperature of the crystallization curve and the maximum heat generation are measured when the temperature-decreasing crystallization temperature (TC2) is measured by a differential scanning calorimeter (DSC).
  • TC2 temperature-decreasing crystallization temperature
  • DSC differential scanning calorimeter
  • the temperature-decreasing crystallization temperature (TC2) in the present invention is measured by using a differential scanning calorimeter (DSC), raising the temperature to 300 ° C. at a heating rate of 20 ° C./min under a nitrogen stream, and at that temperature for 5 minutes. It is the peak temperature (the highest peak when a plurality of peaks appear) when measured by lowering the temperature to 100 ° C. at a rate of 10 ° C./min after holding.
  • DSC differential scanning calorimeter
  • Talc has a nucleating effect, and on the surface of talc in the polyamide resin composition, polyamide resin crystals begin to form at a temperature higher than the normal crystallization temperature.
  • B When the average secondary particle size of the dispersed phase composed of talc is less than 30 ⁇ m, the total surface area of talc increases, so that the talc nucleating effect becomes remarkable, the crystallinity is increased, and mechanically. It is thought that this has led to the improvement of characteristics. At the same time, the effect of increasing the adhesiveness between talc and the polyamide resin is also considered, and it is considered that the mechanical strength is synergistically improved.
  • the appearance characteristics can be improved by adding a small amount of a substance that delays the crystallization of (a1) polyamide 6, such as (a2) polyamide MXD6.
  • the dispersed phase composed of (B) talc having an average secondary particle size of less than 30 ⁇ m tends to be easily generated because the higher the relative viscosity of the (A) polyamide resin, the greater the shearing force during melt-kneading. .. Therefore, in general, it can be said that the relative viscosity of the (A) polyamide resin is preferably higher than 3.0.
  • the above-mentioned components (A), (B), and (C), and if necessary, other additives described later are added in any blending order.
  • the mixture is mixed with a tumbler or a Henschel mixer, etc., and melt-kneaded.
  • melt-kneading method any method well known to those skilled in the art can be used, and a single-screw extruder, a twin-screw extruder, a kneader, a Banbury mixer, a roll, etc. can be used. Among them, a twin-screw extruder is used. It is preferable to do so.
  • L / D which is the ratio of the screw length L (mm) to the diameter D (mm) of the screw, satisfies the relationship of 10 ⁇ (L / D) ⁇ 100. If there is no problem in other operability, it is preferable that the L / D is small from the viewpoint of fine dispersion of the component (B). If it exceeds 100, the mechanical strength of the resin composition tends to decrease due to thermal deterioration.
  • the melting temperature of the resin composition at the time of melt-kneading is preferably 180 to 330 ° C, more preferably 200 to 300 ° C. If the melting temperature is less than 180 ° C., the melting is insufficient and unmelted gel is likely to occur frequently. On the contrary, if the melting temperature exceeds 330 ° C., the resin composition is likely to be thermally deteriorated.
  • the screw rotation speed N during melt-kneading is preferably 100 to 1,500 rpm, more preferably 150 to 1,000 rpm. If the screw rotation speed is less than 100 rpm, the component (B) tends to be difficult to finely disperse, and conversely, if the screw rotation speed exceeds 1,500 rpm, the component (B) tends to aggregate and not be finely dispersed.
  • the discharge amount Q is preferably 5 to 200 kg / hr, more preferably 10 to 100 kg / hr.
  • the discharge amount is less than 5 kg / hr, the dispersibility of the component (B) tends to decrease, and if it exceeds 100 kg / hr, the dispersibility tends to decrease due to the reaggregation of the component (B). ..
  • the Q / N which is the ratio of the discharge amount Q (unit: kg / hr) to the screw rotation speed N (unit: rpm) during melt-kneading, is preferably 0.01 ⁇ (Q / N) ⁇ 1, and is 0. More preferably, 0.05 ⁇ (Q / N) ⁇ 0.9. If it is less than 0.01, the mechanical strength of the resin composition tends to decrease due to thermal deterioration. On the other hand, if it exceeds 1, the carrying capacity becomes insufficient and the component (B) is likely to be ejected. The smaller the Q / N, the easier it is for the component (B) to be finely dispersed. It is considered that this is because the shearing between the raw material pellets is added in addition to the screw, and the fine dispersion is promoted.
  • the present invention is not particularly limited.
  • the component (C) may be added at the same time as the raw material component other than the component (B), or may be added to the component (B) in advance. From the viewpoint of fine dispersion of the component (B), it is preferable to feed from the original feed in order to apply more shear.
  • suction by a vacuum pump is performed between the side opening and the die head at the tip of the extruder. It is desirable to do it.
  • additives can be used in the polyamide resin composition of the present invention.
  • the additive include a stabilizer, an impact improver, a flame retardant, a mold release agent, a slidability improver, a colorant, a plasticizer, a crystal nucleating agent and the like.
  • Stabilizers include organic antioxidants such as hindered phenolic antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants, heat stabilizers, hindered amine-based, benzophenone-based, and imidazole-based light stabilizers.
  • examples include an ultraviolet absorber, a metal inactivating agent, and a copper compound.
  • Copper compounds include cuprous chloride, cuprous bromide, cuprous iodide, cupric chloride, cupric bromide, cupric iodide, cupric phosphate, cupric pyrophosphate, Copper salts of organic carboxylic acids such as copper sulfide, copper nitrate and copper acetate can be used.
  • the constituent components other than the copper compound preferably contain an alkali metal halide compound
  • the alkali metal halide compound includes lithium chloride, lithium bromide, lithium iodide, sodium fluoride, sodium chloride, and bromide. Examples thereof include sodium, sodium iodide, potassium fluoride, potassium chloride, potassium bromide, and potassium iodide.
  • These additives may be used not only alone but also in combination of several. The optimum amount of stabilizer may be selected, but it is possible to add up to 5 parts by mass with respect to 100 parts by mass of the (A) polyamide resin.
  • a combination of a halogen-based flame retardant and a flame retardant aid is good, and as a halogen-based flame retardant, brominated polystyrene, brominated polyphenylene ether, brominated bisphenol type epoxy polymer, brominated styrene maleic acid anhydride.
  • a halogen-based flame retardant brominated polystyrene, brominated polyphenylene ether, brominated bisphenol type epoxy polymer, brominated styrene maleic acid anhydride.
  • Polymers, brominated epoxy resins, brominated phenoxy resins, decabromodiphenyl ethers, decabromobiphenyls, brominated polycarbonates, perchlorocyclopentadecane, brominated crosslinked aromatic polymers and the like are preferable, and the flame retardant aid is trioxide.
  • Examples thereof include layered silicates such as antimony, antimony pentoxide, sodium antimonate, zinc tinate, zinc borate, and montmorillonite, fluoropolymers, and silicones.
  • layered silicates such as antimony, antimony pentoxide, sodium antimonate, zinc tinate, zinc borate, and montmorillonite, fluoropolymers, and silicones.
  • a combination of dibrom polystyrene as the halogen-based flame retardant and any of antimony trioxide, sodium antimonate, and zinc tintate is preferable as the flame retardant aid.
  • the non-halogen flame retardant include melamine cyanurate, red phosphorus, a metal salt of phosphinic acid, and a nitrogen-containing phosphoric acid compound.
  • a combination of a phosphinic acid metal salt and a nitrogen-containing phosphoric acid-based compound is preferable, and the nitrogen-containing phosphoric acid-based compound includes melamine, a melamine condensate such as melam or melon, and a reactive organism of polyphosphoric acid or them. Contains a mixture of.
  • a hydrotalcite compound or an alkaline compound may be added, but it is possible to add up to 20 parts by mass with respect to 100 parts by mass of the (A) polyamide resin.
  • Examples of the release agent include long-chain fatty acids or esters and metal salts thereof, amide compounds, polyethylene waxes, silicones, polyethylene oxides and the like.
  • the long-chain fatty acid is particularly preferably having 12 or more carbon atoms, and examples thereof include stearic acid, 12-hydroxystearic acid, bechenic acid, and montanic acid. Partial or total carboxylic acid is esterified with monoglycol or polyglycol. It may be formed or may form a metal salt.
  • Examples of the amide compound include ethylenebisterephthalamide and methylenebisstearylamide. These release agents may be used alone or as a mixture. The optimum amount of the release material may be selected, but it is possible to add up to 5 parts by mass with respect to 100 parts by mass of the (A) polyamide resin.
  • the polyamide resin composition of the present invention preferably occupies 85% by mass or more, more preferably 90% by mass or more, in total of (A) polyamide resin, (B) talc, and (C) silane-based coupling agent. It is preferable, and it is more preferable to occupy 95% by mass or more.
  • the polyamide resin composition of the present invention has a melt mass flow rate (MFR) of 15 g / 10 minutes or more and less than 75 g / 10 minutes at a water content of 0.05% (0.05 mass%) or less.
  • MFR melt mass flow rate
  • the melt mass flow rate (MFR) is a value measured at 255 ° C. and a load of 2160 g according to JIS K 7210-1: 2014.
  • the melt mass flow rate is less than 15 g / 10 minutes, the fluidity is low, and a good molded product appearance cannot be obtained when molding a molded product having a large flow resistance such as a thin wall or a complicated shape. If the molding temperature is set high and the MFR value is raised, the retention stability may be lowered, which may cause deterioration of the molding appearance and mechanical strength due to gas. On the other hand, when the melt mass flow rate is 75 g / 10 minutes or more, burrs are likely to occur during injection molding, and when the injection pressure or holding pressure is lowered to suppress burrs, the mold transferability is lowered and the appearance of the molded product is reduced. May worsen or sink marks may occur easily.
  • melt mass flow rate may not be reached (less than 15 g / 10 minutes), which is low. It is preferable to use a crystalline polyamide resin having a viscosity (relative viscosity 2.0 to 3.0), or to adopt a formulation such as adding a molecular chain cutting agent of the polyamide resin at the time of compound processing.
  • an aliphatic dicarboxylic acid, an aromatic dicarboxylic acid and the like are effective, and specifically, oxalic acid, malonic acid, succinic acid, adipic acid, etc. Examples thereof include azelaic acid, sebacic acid, phthalic acid and terephthalic acid, but the present invention is not particularly limited.
  • a molecular chain breaking agent is added (contained)
  • the amount added is about 0.1 to 3 parts by mass with respect to 100 parts by mass of the polyamide resin composition of the present invention, and the melt mass flow rate of the composition of the present invention is 15 g / 10 It will be more than a minute.
  • the effect of the molecular chain cutting agent changes depending on the compound processing conditions, and as a matter of course, the higher the processing temperature and the longer the polymer residence time at the time of compounding, the better the effect.
  • the compound processing temperature is in the range of 230 to 290 ° C.
  • the polymer residence time at the time of compounding is generally within 15 to 60 seconds.
  • the polyamide resin composition of the present invention has a bending strength of 120 MPa or more.
  • the upper limit of the bending strength is not particularly limited, but is about 150 MPa.
  • the bending strength is measured according to JIS K 7171: 2016, using a multipurpose test piece having a thickness of 4 mm. The details of the method for measuring the bending strength are as described in Examples.
  • MFR Melt mass flow rate
  • Average secondary particle size of the dispersed phase A cross-sectional section was prepared from the test test piece prepared in 5) below by a microtome, and platinum sputtering was performed, which was multiplied by 500 by a scanning electron microscope (SEM). The maximum length of 500 secondary particles having a maximum length larger than the average primary particle size of talc was measured, and the average value of the maximum lengths of 100 secondary particles was calculated from the largest one. , The average secondary particle size.
  • Molding shrinkage rate After molding a test piece of a flat plate (film gate) having mold dimensions of 100 mm ⁇ 100 mm ⁇ 3 mm (thickness) in the same manner as in 5) and allowing it to stand at 23 ° C. and 50% relative humidity for 24 hours. , The flow direction and the right-angled dimensions of the test piece were measured with a caliper with an accuracy of 0.1 mm. The molding shrinkage in the direction perpendicular to the flow direction was calculated from the mold reference dimensions at the mold temperature at the time of molding, which was measured in advance by the same method.
  • the raw materials used in the examples and comparative examples of the present invention are as follows.
  • the relative viscosity (RV) of the polyamide resin was measured at 20 ° C. by dissolving 0.25 g of the polyamide resin in 25 ml of 96% sulfuric acid, placing 10 ml of this solution in an Ostwald viscosity tube.
  • Example 10 Each raw material was mixed in advance so as to have the composition shown in Table 1, and supplied to the main supply port of an L / D45 twin-screw extruder (TEM26-SS manufactured by Toshiba Machine Co., Ltd.) for melt-kneading. After taking it into a strand shape from the die, it was passed through a water tank to be cooled and solidified, and it was cut with a pelletizer to obtain a polyamide resin composition pellet. The barrel temperature of the extruder was set to 255 ° C., a screw rotation speed of 850 rpm, and a discharge rate of 30 kg / hour. The obtained pellets were dried in a hot air dryer until the moisture content was 0.05% or less, and then various characteristics were evaluated. The evaluation results are shown in Table 1.
  • Example 11 Raw materials other than talc and 1/3 amount of talc are mixed in advance so as to have the composition shown in Table 1 and supplied to the main supply port of the L / D45 twin-screw extruder (TEM26-SS manufactured by Toshiba Machine Co., Ltd.). , The remaining 2/3 amount of talc was supplied from the side feed, and pellets were prepared in the same manner as in Example 1 and evaluated.
  • L / D45 twin-screw extruder TEM26-SS manufactured by Toshiba Machine Co., Ltd.
  • Comparative Example 5 Raw materials other than talc and 1/3 amount of talc are mixed in advance so as to have the composition shown in Table 1 and supplied to the main supply port of the L / D45 twin-screw extruder (TEM26-SS manufactured by Toshiba Machine Co., Ltd.). The remaining 2/3 amount of talc was supplied from the side feed and melt-kneaded. After taking it into a strand shape from the die, it was passed through a water tank to be cooled and solidified, and it was cut with a pelletizer to obtain a polyamide resin composition pellet. The barrel temperature of the extruder was set to 260 ° C., a screw rotation speed of 90 rpm, and a discharge rate of 25 kg / hour. The obtained pellets were dried in a hot air dryer until the moisture content was 0.05% or less, and then various characteristics were evaluated. The evaluation results are shown in Table 1.
  • the molded product made of the polyamide composition of the present invention is remarkably excellent in mechanical properties, heat resistance, dimensional stability, etc., and can be applied to a wide range of applications, and is particularly suitable for automobile interior parts such as consoles and cup holders.

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Abstract

L'invention concerne une composition de résine polyamide qui contient 54 à 75% en masse d'une résine polyamide (A), 24 à 45% en masse d'un talc (B), et 0,01 à 1% en masse d'un agent de couplage au silane (C). La vitesse d'écoulement massique en fusion (MFR) à un taux d'humidité inférieur ou égal à 0,05% en masse de cette composition de résine polyamide, est supérieure ou égale à １５ｇ／１０ minutes et inférieure à ７５ｇ／１０ minutes, et sa résistance à la flexion est supérieure ou égale à １２０ＭＰａ. Enfin, la composition de résine polyamide de l'invention présente une résistance mécanique élevée et un faible taux de retrait au moulage, et se révèle excellente à la fois en termes d'aptitude au moulage et de résistance/rigidité.
PCT/JP2020/010827 2019-03-20 2020-03-12 Composition de résine polyamide WO2020189503A1 (fr)

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JP2001106907A (ja) * 1999-08-04 2001-04-17 Mitsubishi Engineering Plastics Corp 耐候性の改良されたポリアミド樹脂組成物及びそれを用いた成形品
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JP2010013571A (ja) * 2008-07-04 2010-01-21 Toyobo Co Ltd 繊維強化ポリアミド樹脂組成物
JP2010189467A (ja) * 2009-02-16 2010-09-02 Mitsubishi Engineering Plastics Corp ポリアミド樹脂組成物
JP2017030977A (ja) * 2013-12-16 2017-02-09 株式会社勝光山鉱業所 タルク粒子およびそれを含有する有機重合体組成物
JP2019039061A (ja) * 2017-08-29 2019-03-14 ユニチカ株式会社 ポリアミド樹脂めっき成形体

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