WO2015093060A1 - 半芳香族ポリアミド樹脂組成物およびその成型品 - Google Patents
半芳香族ポリアミド樹脂組成物およびその成型品 Download PDFInfo
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- WO2015093060A1 WO2015093060A1 PCT/JP2014/006356 JP2014006356W WO2015093060A1 WO 2015093060 A1 WO2015093060 A1 WO 2015093060A1 JP 2014006356 W JP2014006356 W JP 2014006356W WO 2015093060 A1 WO2015093060 A1 WO 2015093060A1
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- aromatic polyamide
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- 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
- C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/02—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids
- C08G69/26—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
- C08G69/265—Polyamides derived from amino-carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids from at least two different diamines or at least two different dicarboxylic acids
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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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
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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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
- C08L23/30—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by oxidation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/06—Polymer mixtures characterised by other features having improved processability or containing aids for moulding methods
Definitions
- the present invention relates to a semi-aromatic polyamide resin composition having excellent rigidity and impact resistance, and extremely small change in hardness due to heating / cooling and excellent bonding properties, and a molded product thereof.
- Polyamides typified by nylon 6, nylon 66, etc. are excellent in molding processability, mechanical properties and chemical resistance, so various types for automobiles, industrial materials, clothing, electrical / electronic or industrial use. Widely used as part material.
- Polyamide is particularly frequently used for automobile parts, for example, engine covers, connectors directly connected thereto, engine body related parts such as air intakes and manifolds, relay boxes, gears, and clips. Yes.
- resin for metal parts is also progressing, and higher rigidity and impact resistance (toughness, etc.) are required for resin materials.
- resin parts are also required to have excellent bonding (welding) properties.
- engine and motor components including battery materials have been increasingly demanded in combination with the need to improve fuel economy through weight reduction.
- semi-aromatic polyamide has a high melting point and high crystallinity. Therefore, compared with nylon 6 and nylon 66, the weldability with respect to another resin member is low, and the tolerance with respect to the heat shock stress accompanying repeated heating and cooling is low. As a result, poor bonding was likely to occur between them. In other words, semi-aromatic polyamides such as 6T nylon have a problem that long-term reliability is insufficient in application to engine peripheral parts and the like.
- the composition containing the semi-aromatic polyamide and a general polyolefin resin is particularly resistant to heat shock stress. I found it easy to get worse. And the member containing a semi-aromatic polyamide resin and a polyolefin resin found that the hardness is easily changed by heat shock, and causes poor bonding with other resin members. In other words, with conventional semi-aromatic polyamide resins and resin compositions containing them, it is difficult to firmly bond them to various resin members, and it is difficult to satisfy high rigidity, impact resistance and heat shock resistance at the same time. there were.
- An object of the present invention is to provide a semi-aromatic polyamide resin composition having high rigidity, excellent impact resistance, extremely small change in hardness due to heating / cooling and having excellent bonding properties, and a molded product thereof. .
- the first of the present invention relates to the following semi-aromatic polyamide resin composition.
- a semi-fragrance comprising a semi-aromatic polyamide resin (A) composed of a dicarboxylic acid component unit and an aliphatic diamine component unit, an acid-modified polyolefin resin (B), and a fibrous filler (C).
- the semi-aromatic polyamide resin (A) comprises 60 mol% or more of terephthalic acid component units with respect to the total number of moles of the dicarboxylic acid component units, and the semi-aromatic polyamide resin.
- the semi-aromatic polyamide resin composition satisfies the following requirement (1), and the acid-modified polyolefin resin (B) satisfies the following requirement (2).
- the glass transition temperature derived from the semi-aromatic polyamide resin (A) measured by DSC is in the range of 90 ° C. to 180 ° C.
- the Vicat softening point measured in accordance with ASTM D1525 is 45 ° C. In the range of 110 ° C
- the acid-modified polyolefin resin (B) is a resin obtained by modifying an olefin polymer with an unsaturated carboxylic acid or a derivative thereof, and the semi-aromatic polyamide resin (A).
- the total number of moles of terminal amino groups (MA) and the total number of moles (MB) of acid groups and derivative groups of the acid-modified polyolefin resin (B) satisfy the following requirement (3): [1] Or the semi-aromatic polyamide resin composition as described in [2].
- a linear alkylenediamine component unit having 4 to 18 carbon atoms is contained in an amount of 40 to 90 mol% based on the total number of moles of the aliphatic diamine component unit.
- A2 Side chain alkylene having 4 to 18 carbon atoms The diamine component unit is contained in an amount of 10 to 60 mol% with respect to the total number of moles of the aliphatic diamine component unit.
- the side chain alkylenediamine component unit includes at least one of a 2-methyl-1,8-octanediamine component unit and a 2-methyl-1,5-pentadiamine component unit.
- Semi-aromatic polyamide resin composition [7] The linear alkylenediamine component unit includes a 1,6-diaminohexane component unit, and the side chain alkylenediamine component unit includes a 2-methyl-1,5-pentadiamine component unit. [5] Or the semi-aromatic polyamide resin composition as described in [6].
- the aliphatic diamine component unit is more than 45 mol% and less than 55 mol% of 1,6-diaminohexane component unit, and more than 45 mol% and less than 55 mol% of 2-methyl-1,5-pentadiamine component unit.
- the linear alkylene diamine component unit includes a 1,9-nonane diamine component unit, and the side chain alkylene diamine component unit includes a 2-methyl-1,8-octane diamine component unit.
- the dicarboxylic acid component unit of the semi-aromatic polyamide resin (A) further includes an isophthalic acid component unit, and the number of carbon atoms of the aliphatic diamine component unit of the semi-aromatic polyamide resin (A) is The semi-aromatic polyamide resin composition according to any one of [1] to [9], which is 4 to 15.
- the dicarboxylic acid component unit of the semi-aromatic polyamide resin (A) further includes an isophthalic acid component unit, and a molar ratio of the terephthalic acid component unit to the isophthalic acid component unit is 60/40.
- the graft amount of the unsaturated carboxylic acid or derivative thereof is 0.01 to 1.5% by mass.
- the density measured in accordance with JIS K7112 is in the range of 890 to 940 kg / m 3.
- 30 to 90% by mass of the semiaromatic polyamide resin (A), 1 to 20% by mass of the acid-modified polyolefin resin (B), and 5 to 60% by mass of the fibrous filler (C) ( However, the total of the semi-aromatic polyamide resin (A), the acid-modified polyolefin resin (B), and the fibrous filler (C) is 100% by mass), any one of [1] to [12] The semi-aromatic polyamide resin composition described in 1.
- the second of the present invention relates to the following molded articles.
- a molded article comprising the semi-aromatic polyamide resin composition according to any one of [1] to [13].
- the semi-aromatic polyamide resin composition of the present invention various moldings having high rigidity, excellent impact resistance, extremely small change in hardness due to heating / cooling, and excellent bondability with other resin members, etc. Goods are obtained.
- FIG. It is a figure which shows the measurement result by the horizontal force microscope (LFM) of Example 2.
- FIG. It is a figure which shows the measurement result by the horizontal force microscope (LFM) of Example 4.
- FIG. It is a figure which shows the measurement result by the horizontal force microscope (LFM) of the comparative example 5.
- a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
- the amount of each component in the composition when there are a plurality of substances corresponding to each component in the composition, the plurality present in the composition unless otherwise specified. Means the total amount of substances.
- the semi-aromatic polyamide resin composition of the present invention includes a semi-aromatic polyamide resin (A), an acid-modified polyolefin resin (B), And a fibrous filler (C).
- the polyolefin resin (B) of the resin composition of the present invention is acid-modified. Therefore, the compatibility between the semi-aromatic polyamide resin (A) and the acid-modified polyolefin resin (B) is good. That is, since the relatively soft acid-modified polyolefin resin (B) is well dispersed in the semi-aromatic polyamide resin (A), the resin composition of the present invention has high weldability to other members. Furthermore, the impact resistance of the resin composition is increased by containing a certain amount of the acid-modified polyolefin resin (B).
- the softening point of the acid-modified polyolefin resin (B) is relatively high, the hardness of the molded product obtained from the resin composition hardly changes even when the temperature changes. That is, the heat shock resistance of the resin composition is increased. Moreover, acid-modified polyolefin resin (B) has high insulation. And when the softening point of acid-modified polyolefin resin (B) is comparatively high, the insulation property at high temperature of a resin composition will be kept high. That is, according to the present invention, it is possible to obtain a resin composition having high rigidity and impact resistance, good weldability with other members, high resistance to heat shock, and high insulation even at high temperatures. .
- the semi-aromatic polyamide resin (A) includes a component derived from an aromatic carboxylic acid (terephthalic acid) and a component derived from an aliphatic diamine.
- the semi-aromatic polyamide resin (A) has a glass transition temperature (Tg) measured by differential scanning calorimetry (DSC) of 90 to 180 ° C., preferably 110 to 150 ° C.
- Tg glass transition temperature measured by differential scanning calorimetry
- the melting point (Tm) of the semi-aromatic polyamide resin (A) measured by differential scanning calorimetry (DSC) is preferably 280 to 330 ° C., more preferably 290 to 330 ° C.
- Tm differential scanning calorimetry
- the melting point of the semi-aromatic polyamide resin (A) is within the above range, a resin composition having more excellent mechanical strength and moldability is easily obtained.
- the semi-aromatic polyamide resin (A) having an excessively high melting point is contained in the resin composition, it is necessary to set the molding temperature for molding the resin composition high.
- the acid-modified polyolefin resin (B) or the like is likely to be thermally decomposed and mold contamination is likely to occur.
- the continuous moldability tends to decrease.
- the melting point of the semi-aromatic polyamide resin (A) is in the above range, the resin composition can be molded at an appropriate temperature.
- the glass transition temperature and melting point of the semi-aromatic polyamide resin (A) are determined depending on the dicarboxylic acid component unit, the type of aliphatic diamine component unit constituting the semi-aromatic polyamide resin (A), and the semi-aromatic polyamide resin (A). It can be adjusted by molecular weight or the like.
- the melting point (Tm) and glass transition temperature (Tg) of the semi-aromatic polyamide resin (A) are measured with a differential scanning calorimeter (for example, DSC220C type, manufactured by Seiko Instruments Inc.). Specifically, about 5 mg of semi-aromatic polyamide resin (A) is sealed in an aluminum pan for measurement and heated from room temperature to 330 ° C. at 10 ° C./min. In order to completely melt the semi-aromatic polyamide resin (A), it is maintained at 330 ° C. for 5 minutes and then cooled to 30 ° C. at 10 ° C./min. Then, after 5 minutes at 30 ° C., the second heating is performed to 330 ° C. at 10 ° C./min.
- DSC220C type for example, DSC220C type, manufactured by Seiko Instruments Inc.
- the peak temperature (° C.) in the second heating is defined as the melting point (Tm) of the semi-aromatic polyamide resin (A), and the displacement point corresponding to the glass transition is defined as the glass transition temperature (Tg).
- Tm melting point
- Tg glass transition temperature
- the intrinsic viscosity [ ⁇ ] of the semi-aromatic polyamide resin (A) measured in a sulfuric acid at 25 ° C. and 96.5% is preferably 0.7 to 1.6 dl / g, 0.8 More preferably, it is -1.2 dl / g.
- the intrinsic viscosity [ ⁇ ] is adjusted by the molecular weight of the semi-aromatic polyamide resin (A).
- the molecular weight of the semi-aromatic polyamide resin (A) is adjusted by blending a molecular weight adjusting agent (for example, a terminal blocking agent) into the reaction system at the time of preparation.
- the intrinsic viscosity is about 0.5 g of semi-aromatic polyamide resin (A) dissolved in 50 ml of 96.5% concentrated sulfuric acid, and the resulting solution was allowed to flow under conditions of 25 ° ⁇ 0.05 ° C.
- the semi-aromatic polyamide resin (A) may be sealed with a terminal sealing agent.
- End capping agents can be, for example, monocarboxylic acids and monoamines.
- the amount of terminal amino groups in the molecular chain of the semi-aromatic polyamide resin (A) is preferably 0.1 to 200 mmol / kg, more preferably 0.1 to 150 mmol / kg, and particularly preferably 0.1. 1 to 120 mmol / kg.
- the presence of an amino group of 0.1 mmol / kg or more at the terminal of the semi-aromatic polyamide resin (A) increases the compatibility between the semi-aromatic polyamide resin (A) and the acid-modified polyolefin resin (B). The strength of the surface of the molded product is likely to increase.
- the amount of terminal amino groups is 200 mmol / kg or less, the water absorption of the semi-aromatic polyamide resin (A) can be kept low, and the resulting molded article tends to have excellent heat resistance and the like.
- the amount of terminal amino groups is adjusted based on the ratio of diamine and dicarboxylic acid to be reacted at the time of preparing the semi-aromatic polyamide resin (A) and the amount of the terminal blocking agent.
- the terminal amino group content is obtained by adding a terminal blocking agent composed of a monocarboxylic acid or the like to a system containing a diamine and a dicarboxylic acid at the time of preparing the semi-aromatic polyamide resin (A) and sealing a part of the terminals. Is adjusted.
- the amount of the terminal amino group is measured by the following method. 1 g of semi-aromatic polyamide resin (A) is dissolved in 35 mL of phenol, and 2 mL of methanol is mixed to obtain a sample solution. Then, using thymol blue as an indicator, the sample solution is titrated using a 0.01 N aqueous HCl solution to specify the amount of terminal amino groups ([NH 2 ], unit: mmol / kg).
- the dicarboxylic acid component unit of the semi-aromatic polyamide resin (A) includes at least a terephthalic acid component unit.
- the terephthalic acid component unit is included in the constituent components of the resin, the rigidity of the semi-aromatic polyamide resin (A) increases, and the rigidity, heat resistance, and chemical resistance of the resin composition increase.
- the amount of the terephthalic acid component unit contained in the semiaromatic polyamide resin (A) is 60 mol% or more with respect to the total number of dicarboxylic acid component units constituting the semiaromatic polyamide resin (A), preferably Is from 65 to 100 mol%, more preferably from 70 to 100 mol%.
- the dicarboxylic acid component unit contains 60 mol% or more of the terephthalic acid component unit, the rigidity, heat resistance, chemical resistance and the like of the semiaromatic polyamide resin composition are likely to be sufficiently increased.
- the semi-aromatic polyamide resin (A) may contain a dicarboxylic acid-derived component unit other than terephthalic acid as the dicarboxylic acid component unit.
- dicarboxylic acids other than terephthalic acid include aromatic dicarboxylic acids such as isophthalic acid, 2-methylterephthalic acid and naphthalenedicarboxylic acid; furandicarboxylic acids such as 2,5-furandicarboxylic acid and 1,4-cyclohexanedicarboxylic acid Alicyclic dicarboxylic acids such as 1,3-cyclohexanedicarboxylic acid; malonic acid, dimethylmalonic acid, succinic acid, glutaric acid, adipic acid, 2-methyladipic acid, trimethyladipic acid, pimelic acid, 2,2-dimethyl Glutaric acid, 3,3-diethylsuccinic acid, azelaic acid, sebacic acid, suberic acid, and aliphatic dicarbox
- the semi-aromatic polyamide resin (A) may contain only one type of component unit derived from these, or two or more types of component units.
- the dicarboxylic acid component unit other than the terephthalic acid component unit is preferably a component unit derived from an aromatic dicarboxylic acid, and more preferably an isophthalic acid component unit.
- the molar ratio thereof is 60/40 to 99. Is preferably 0.9 / 0.1, more preferably 60/40 to 90/10, and still more preferably 60/40 to 85/15.
- the amount of the terephthalic acid component unit is in the above range, as described above, the heat resistance of the resin composition tends to increase.
- the aliphatic diamine component unit constituting the semiaromatic polyamide resin (A) has 4 to 18 carbon atoms and is a component unit derived from a linear alkylenediamine (hereinafter referred to as “linear alkylene”). Or a component unit derived from an alkylene diamine having 4 to 18 carbon atoms and having a side chain (hereinafter also referred to as a “side chain alkylene diamine component unit”). .
- the number of carbon atoms in the side chain alkylenediamine is a number including the number of carbon atoms contained in the side chain.
- the semi-aromatic polyamide resin (A) may include only one of them, but more preferably includes both.
- the linear alkylenediamine component unit is preferably contained in an amount of 40 to 90 mol%, more preferably 50 to 80 mol%, based on the total number of moles (100 mol%) of the aliphatic diamine component unit. is there.
- the toughness of the resin composition is excellent.
- the number of carbon atoms in the linear alkylenediamine component unit is preferably 4-15, more preferably 6-12.
- Specific examples of the linear alkylenediamine component unit include 1,4-diaminobutane, 1,6-diaminohexane, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminononane, 1,10- Diaminodecane, 1,11-diaminoundecane, 1,12-diaminododecane and the like are included.
- the semi-aromatic polyamide resin (A) may contain only one type of linear alkylenediamine component unit, or may contain two or more types.
- 1,6-diaminohexane and 1,9-nonanediamine are preferable, and they are preferably contained in a total amount of 50 to 100 mol% with respect to the total number of moles (100 mol%) of the linear alkylenediamine. .
- the side chain alkylenediamine component unit is preferably contained in an amount of 10 to 60 mol%, more preferably 20 to 50 mol%, based on the total number of moles (100 mol%) of the aliphatic diamine component unit.
- the semi-aromatic polyamide resin (A) contains a certain amount of side-chain alkylenediamine component units, the impact resistance of the resin composition tends to increase. Although the reason is not certain, it is considered that the dispersibility of the acid-modified polyolefin resin (B) is improved by the side chain structure.
- the number of carbon atoms in the side chain alkylenediamine component unit is preferably 4 to 15, and more preferably 6 to 12.
- Specific examples of the side chain alkylenediamine component unit include 2-methyl-1,5-diaminopetane, 2-methyl-1,6-diaminohexane, 2-methyl-1,7-diaminoheptane, 2-methyl-1 , 8-diaminooctane, 2-methyl-1,9-diaminononane, 2-methyl-1,10-diaminodecane, 2-methyl-1,11-diaminoundecane and the like.
- the semi-aromatic polyamide resin (A) may contain only one type of side chain alkylenediamine component unit, or may contain two or more types. Among these, 2-methyl-1,5-diaminopentane and 2-methyl-1,8-octanediamine are preferable.
- the semi-aromatic polyamide resin (A) preferably includes a linear alkylene diamine component unit and a side chain alkylene diamine component unit as the aliphatic diamine component unit.
- examples include a combination of a 1,6-diaminohexane component unit and a 2-methyl-1,5-pentadiamine component unit.
- the 1,6-diaminohexane component unit is more than 45 mol% and less than 55 mol%
- 2-methyl-1,5-pentadiamine is more than 45 mol% with respect to the total number of moles of the aliphatic diamine component unit. It is preferable to contain less than mol%.
- a preferable combination is a combination of a 1,9-nonanediamine component unit and a 2-methyl-1,8-octanediamine component unit.
- the 1,9-nonanediamine component unit is more than 45 mol% and less than 85 mol%
- the 2-methyl-1,8-octanediamine unit unit is more than 15 mol% with respect to the total number of moles of the aliphatic diamine component unit. It is preferable to contain less than 55 mol%.
- the aliphatic diamine component unit has an aliphatic carbon diamine component unit having a larger number of carbon atoms than the linear alkylene diamine component unit or side chain alkylene diamine component unit as long as the effects of the present invention are not impaired. May be included.
- the semi-aromatic polyamide resin (A) may contain diamine component units other than the aliphatic diamine component units as long as the effects of the present invention are not impaired. Examples of the diamine component unit other than the aliphatic diamine component unit include an alicyclic diamine component unit and an aromatic diamine component unit.
- Examples of particularly preferred resins as the semiaromatic polyamide resin (A) include dicarboxylic acid component units being terephthalic acid component units, aliphatic diamine component units being 1,6-diaminohexane and 2-methyl-1, Resin which is 5-pentadiamine; resin whose dicarboxylic acid component unit is terephthalic acid component unit and aliphatic diamine component unit is 1,9-nonanediamine and 2-methyl-1,8-pentadiamine; dicarboxylic acid component Resins and the like in which the unit is a terephthalic acid component unit and an isophthalic acid component unit and the aliphatic diamine component unit is 1,6-diaminohexane are included.
- the semi-aromatic polyamide resin (A) can be produced in the same manner as known semi-aromatic polyamides, and can be produced, for example, by polycondensation of dicarboxylic acid and diamine in a homogeneous solution. More specifically, a low-order condensate is obtained by heating dicarboxylic acid and diamine in the presence of a catalyst as described in WO 03/085029, and then this low-order condensate. It can be produced by polycondensation by applying shear stress to the melt.
- Molecular weight modifiers can be, for example, monocarboxylic acids and monoamines.
- monocarboxylic acids that can be molecular weight modifiers include aliphatic monocarboxylic acids having 2 to 30 carbon atoms, aromatic monocarboxylic acids, and alicyclic monocarboxylic acids.
- the molecular weight of the semi-aromatic polyamide resin (A) can be adjusted, and the amount of terminal amino groups of the semi-aromatic polyamide resin (A) can be adjusted.
- the aromatic monocarboxylic acid and the alicyclic monocarboxylic acid may have a substituent in the cyclic structure portion.
- Examples of the aliphatic monocarboxylic acids include acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, lauric acid, tridecylic acid, myristic acid, palmitic acid, stearic acid, oleic acid and linoleic acid Is included.
- Examples of the aromatic monocarboxylic acid include benzoic acid, toluic acid, naphthalenecarboxylic acid, methylnaphthalenecarboxylic acid, and phenylacetic acid.
- Examples of the alicyclic monocarboxylic acid include cyclohexanecarboxylic acid. It is.
- the molecular weight modifier is added to the reaction system of dicarboxylic acid and diamine.
- the addition amount is preferably 0.07 mol or less, more preferably 0.05 mol or less, with respect to 1 mol of the total amount of dicarboxylic acid.
- Acid-modified polyolefin resin (B) means a resin in which an olefin polymer is modified with a compound containing an acid group or a derivative thereof, and a structural unit containing an acid group or a derivative group in the skeleton made of the olefin polymer. It has a structure in which (acid group-containing structural unit) is bonded.
- the acid group or derivative group thereof is preferably a functional group containing a hetero atom, and more specifically a functional group containing carbon, hydrogen, or oxygen.
- specific acid groups or derivative groups thereof include carboxylic acid groups, carboxylic anhydride groups, carboxylic acid groups, ester groups, amide groups, and the like. Among these, a carboxylic anhydride group is preferable.
- the acid group-containing structure is preferably bound to 0.1 to 1.5 parts by mass (graft bond), more preferably 0.2 to 100 parts by mass of the olefin polymer as a skeleton. 1.1 parts by mass.
- graft bond a graft amount of the acid group-containing structural unit in the acid-modified polyolefin resin (B) is within the above range, the impact resistance of the molded product obtained from the resin composition is likely to increase, and the fluidity during molding is also likely to increase. .
- the semi-aromatic polyamide resin (A) and the functional group of the acid-modified polyolefin resin (B) react or interact with each other, and the semi-aromatic polyamide resin (A )
- the acid-modified polyolefin resin (B) is easily dispersed in the resin composition. As a result, it is assumed that the impact resistance of the molded body is increased.
- the amount of the acid group-containing structural unit contained in the acid-modified polyolefin resin (B) is the charge ratio between the olefin polymer and the compound containing an acid group or its derivative group, 13 C-NMR measurement, 1 H-NMR measurement, etc. It can be specified by a known means. Specific conditions for NMR measurement include the following conditions.
- an ECX400 type nuclear magnetic resonance apparatus manufactured by JEOL Ltd. was used, the solvent was deuterated orthodichlorobenzene, the sample concentration was 20 mg / 0.6 mL, and the measurement temperature was 120 ° C.
- the observation nucleus is 1 H (400 MHz), the sequence is a single pulse, the pulse width is 5.12 ⁇ s (45 ° pulse), the repetition time is 7.0 seconds, and the number of integrations is 500 times or more.
- the standard chemical shift is 0 ppm for tetramethylsilane hydrogen.
- the same result can be obtained by setting the peak derived from residual hydrogen in deuterated orthodichlorobenzene to 7.10 ppm and setting the standard value for chemical shift. be able to.
- a peak such as 1 H derived from the functional group-containing compound can be assigned by a conventional method.
- an ECP500 type nuclear magnetic resonance apparatus manufactured by JEOL Ltd. was used, a mixed solvent of orthodichlorobenzene / heavy benzene (80/20% by volume), a measurement temperature of 120 ° C., observation The core is 13 C (125 MHz), single pulse proton decoupling, 45 ° pulse, repetition time is 5.5 seconds, integration is 10,000 times or more, and 27.50 ppm is the standard value for chemical shift. Assignment of various signals is performed based on a conventional method, and quantification can be performed based on an integrated value of signal intensity.
- the Vicat softening point (° C.) of the acid-modified polyolefin resin (B) measured according to ASTM D1525 is 45 to 110 ° C., more preferably 90 to 110 ° C., still more preferably 95 to 110 ° C. It is.
- the Vicat softening point is “the content (mass ratio) of each acid-modified polyolefin resin (B) and its Vicat softening point. Is the sum of the products.
- Vicat softening Points are determined as follows.
- the resin composition of this invention contains three types of acid-modified polyolefin resin (B), it can obtain
- Vicat softening point ⁇ 1 ⁇ ⁇ 1 / ( ⁇ 1 + ⁇ 2 ) + ⁇ 2 ⁇ ⁇ 2 / ( ⁇ 1 + ⁇ 2 )
- the resin composition containing the acid-modified polyolefin resin (B) having a Vicat softening point of 45 ° C. or higher there is little change in hardness due to temperature, and it is difficult to receive a history due to heat. That is, the heat shock resistance of the resin composition is increased. Therefore, the obtained molded product has a small change in hardness at the joint interface, and is suitable for automotive parts such as in an engine room where heat shock resistance is required.
- the Vicat softening point is 110 ° C. or lower, the impact resistance of a molded product obtained from the resin composition is likely to increase. In addition, the volume resistivity increases, and the insulating properties are likely to increase even at high temperatures.
- Vicat softening point is measured according to ASTM D1525. Specifically, the acid-modified polyolefin resin (B) is molded by an injection molding method at a cylinder temperature: melting point (Tm) of the acid-modified polyolefin resin (B) + 10 ° C., and a test piece (12.5 mm (width) ⁇ 120 mm (Long) ⁇ 3 mm (thickness)). And a Vicat softening point is measured by A50 method based on ASTMD1525.
- the density of the acid-modified polyolefin resin (B) is preferably 890 to 940 Kg / m 3 , and more preferably 910 to 940 g / cm 3 .
- the density is a value measured at a temperature of 23 ° C. using a density gradient tube in accordance with JIS K7112.
- the intrinsic viscosity [ ⁇ ] of the acid-modified polyolefin resin (B) measured in a 135 ° C. decalin (decahydronaphthalene) solution is preferably 0.5 to 4.0 dl / g, more preferably 0.5 to 3 dl / g, more preferably 0.7 to 3 dl / g.
- the intrinsic viscosity [ ⁇ ] of the acid-modified polyolefin resin (B) is within the above range, the impact resistance and melt fluidity of the resin composition of the present invention are compatible at a high level.
- the intrinsic viscosity [ ⁇ ] in decalin at 135 ° C. of the acid-modified polyolefin resin (B) is measured as follows based on a conventional method. 20 mg of a sample is dissolved in 15 ml of decalin, and the specific viscosity ( ⁇ sp) is measured in an atmosphere of 135 ° C. using an Ubbelohde viscometer. After adding 5 ml of decalin to the decalin solution and diluting, the same specific viscosity is measured. Based on the measurement result obtained by repeating this dilution operation and viscosity measurement twice more, the “ ⁇ sp / C” value when the concentration (C) is extrapolated to zero is defined as the intrinsic viscosity [ ⁇ ].
- the melt flow rate (190 ° C., 2.16 kg load) of the acid-modified polyolefin resin (B) is preferably in the range of 0.1 to 50 g / 10 min, and preferably in the range of 0.3 to 40 g / 10 min. More preferably, it is in the range of 0.3 to 30 g / 10 min.
- the melt flow rate of the acid-modified polyolefin resin (B) is within the above range, the impact resistance of the obtained molded product is likely to be increased, and the fluidity of the resin composition at the time of molding is also likely to be enhanced.
- the acid-modified polyolefin resin (B) is obtained, for example, by reacting an olefin polymer with a compound containing an acid group or a derivative group thereof in a structure at a specific ratio.
- the olefin polymer that is the skeleton of the acid-modified polyolefin resin (B) may be a known olefin polymer such as an ethylene polymer, a propylene polymer, or a butene polymer.
- the olefin polymer is preferably a copolymer of ethylene and ⁇ -olefin (ethylene / ⁇ -olefin copolymer), more preferably ethylene and propylene, 1-butene, 1-hexene, 4- A copolymer with an ⁇ -olefin having 3 to 10 carbon atoms such as methyl-1-pentene, 1-octene, 1-decene and the like.
- ethylene / ⁇ -olefin copolymer examples include an ethylene / propylene copolymer, an ethylene / 1-butene copolymer, an ethylene / 1-hexene copolymer, an ethylene / 1-octene copolymer, 4-methyl-1-pentene copolymer and the like, particularly preferably ethylene / propylene copolymer, ethylene / 1-butene copolymer, ethylene / 1-hexene copolymer, ethylene / 1-octene copolymer. It is a polymer.
- the production method of the ethylene / ⁇ -olefin copolymer is not particularly limited.
- a transition metal catalyst such as titanium (Ti), vanadium (V), chromium (Cr), or zirconium (Zr) is used. It may be a known method. More specifically, ethylene is copolymerized with one or more ⁇ -olefins having 3 to 10 carbon atoms in the presence of a Ziegler catalyst or a metallocene catalyst composed of a V compound and an organoaluminum compound. It can be a method of manufacturing by. In particular, a method using a metallocene catalyst is preferable.
- the density of the ethylene / ⁇ -olefin copolymer before modification hardly changes before and after graft modification. Therefore, the ethylene / ⁇ -olefin copolymer used as a raw material preferably has the same density as the acid-modified polyolefin resin (B). Specifically, the density of the ethylene / ⁇ -olefin copolymer is preferably 890 to 940 kg / m 3 , and more preferably 910 to 940 kg / cm 3 .
- the compound containing an acid group or a derivative group thereof to be reacted with the olefin polymer is not particularly limited as long as it is a compound having an acid group or a derivative group thereof and a group capable of binding to the olefin polymer. It is preferably an unsaturated carboxylic acid or a derivative thereof.
- the unsaturated carboxylic acid or its derivative include acrylic acid, methacrylic acid, ⁇ -ethylacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, tetrahydrophthalic acid, methyltetrahydrophthalic acid, endocis-bicyclo [ 2,2,1] hept-5-ene-2,3-dicarboxylic acid (Nadic acid (trademark)) and other unsaturated carboxylic acids and derivatives thereof such as acid halides, amides, imides, acid anhydrides and esters Etc. are included.
- unsaturated dicarboxylic acid or its acid anhydride is suitable, and maleic acid, Nadic acid (trademark), or these acid anhydrides are suitable.
- maleic anhydride is a preferred compound.
- Maleic anhydride has a relatively high reactivity with the olefin polymer, and further has a chemically stable structure, so that polymerization of maleic anhydride is difficult to occur. Therefore, it is easy to obtain an acid-modified polyolefin resin (B) having a stable quality.
- the graft modification of the ethylene / ⁇ -olefin copolymer can be carried out by a known method.
- an unsaturated carboxylic acid or a derivative thereof and a radical initiator are added to a solution in which an ethylene / ⁇ -olefin copolymer is dissolved in an organic solvent, and the temperature is usually 60 to 350 ° C., preferably 80 to 190 ° C.
- the reaction may be performed for 0.5 to 15 hours, preferably 1 to 10 hours.
- the organic solvent in which the ethylene / ⁇ -olefin copolymer is dissolved is not particularly limited, and may be an aromatic hydrocarbon solvent such as benzene, toluene or xylene; an aliphatic hydrocarbon solvent such as pentane, hexane or heptane. sell.
- ethylene / ⁇ -olefin copolymer and unsaturated carboxylic acid or a derivative thereof are preferably used in an extruder or the like in the absence of a solvent.
- the method of making it react is mentioned.
- the reaction conditions in this case are preferably such that the reaction temperature is usually not lower than the melting point of the ethylene / ⁇ -olefin copolymer, specifically 100 to 350 ° C.
- the reaction time can usually be 0.5 to 10 minutes.
- radical initiator examples include benzoyl peroxide, dichlorobenzoyl peroxide, dicumyl 14 peroxide, di-t-butyl peroxide, 2,5-dimethyl-2,5-di (peroxidebenzoate) hexyne-3,1,4-bis ( t-butylperoxyisopropyl) benzene, lauroyl peroxide, t-butylperacetate, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3,2,5-dimethyl-2,5-di ( t-butylperoxy) hexane, t-butylperbenzoate, t-butylperpheny
- dicumyl peroxide, di-t-butyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3,2,5-dimethyl-2,5-di (t- Dialkyl peroxides such as butylperoxy) hexane and 1,4-bis (t-butylperoxyisopropyl) benzene are preferred.
- the radical initiator is usually used at a ratio of 0.001 to 1 part by mass with respect to 100 parts by mass of the ethylene / ⁇ -olefin copolymer.
- Fibrous filler (C) The fibrous filler (C) is not particularly limited, and may be any of a fibrous filler made of an inorganic compound and a fibrous filler made of an organic compound.
- the fibrous filler (C) include glass fiber, carbon fiber, wholly aromatic polyamide fiber (for example, polyparaphenylene terephthalamide fiber, polymetaphenylene terephthalamide fiber, polyparaphenylene isophthalamide fiber, polymetaphenylene).
- Isophthalamide fiber fiber obtained from a condensate of diaminodiphenyl ether and terephthalic acid or isophthalic acid), boron fiber, liquid crystal polyester fiber and the like.
- fibrous fillers (C) Only 1 type of fibrous fillers (C) may be contained in a resin composition, and 2 or more types may be contained.
- the fibrous filler (C) is particularly at least one selected from glass fiber, carbon fiber, and wholly aromatic polyamide fiber, from the viewpoint that the mechanical properties and heat resistance of the resulting molded article are increased. preferable.
- the filler (C) is preferably subjected to a surface treatment.
- the surface treatment agent for the fibrous filler (C) include coupling agents such as silane coupling agents, titanium coupling agents, aluminate coupling agents, and bundling agents.
- Preferred coupling agents include aminosilane, epoxy silane, methyltrimethoxysilane, methyltriethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, vinyltriacetoxysilane, and vinyltrimethoxysilane.
- Preferred sizing agents include epoxy compounds, urethane compounds, carboxylic acid compounds, urethane / maleic acid modified compounds, and urethane / amine modified compounds. These surface treatment agents may be used individually by 1 type, and 2 or more types may be used together. In particular, when a coupling agent and a sizing agent are used in combination, the adhesion between the fibrous filler (C) and the semi-aromatic polyamide resin (A) is further improved, and the mechanical properties of the molded product obtained from the resin composition are improved. More improved.
- the surface-treated fibrous filler (C) loses mass when heated at 625 ⁇ 20 ° C. for 10 minutes or more; that is, the amount of treatment with the surface agent is the total mass of the surface-treated fibrous filler (C).
- the content is preferably 0.01 to 8.0% by mass, more preferably 0.1 to 5.0% by mass.
- the length of the fibrous filler (C) is not particularly limited, but is preferably 1 ⁇ m to 20 mm, more preferably 5 ⁇ m to 10 mm.
- the fiber diameter of the fibrous filler is preferably 0.1 ⁇ m to 100 ⁇ m, more preferably 3 ⁇ m to 50 ⁇ m.
- the resin composition of this invention may contain arbitrary additives according to the use in the range which does not impair the effect of invention.
- additives include antioxidants (phenols, amines, sulfurs, phosphorus, etc.), fillers (clay, silica, alumina, talc, kaolin, quartz, mica, graphite, etc.), heat stabilizers ( Lactone compounds, vitamin Es, hydroquinones, copper halides, iodine compounds, etc.), light stabilizers (benzotriazoles, triazines, benzophenones, benzoates, hindered amines, ogizanides, etc.), flame retardants (bromine-based, Chlorine, phosphorus, antimony, inorganic, etc.), lubricant, fluorescent brightener, plasticizer, thickener, antistatic agent, mold release agent, pigment, crystal nucleating agent, various known additives .
- the resin composition includes polymers other than the semi-aromatic polyamide resin (A) and the acid-modified polyolefin resin (B) (olefin homopolymers such as polyethylene; ethylene / propylene copolymer, ethylene Ethylene / ⁇ -olefin copolymer such as 1-butene copolymer; Propylene / ⁇ -olefin copolymer such as propylene / 1-butene copolymer; Polystyrene; Polyamide; Polycarbonate; Polyacetal; Polyrphone; Polyphenylene oxide; Fluorine Resin; silicone resin; LCP, etc.).
- polymers other than the semi-aromatic polyamide resin (A) and the acid-modified polyolefin resin (B) olefin homopolymers such as polyethylene; ethylene / propylene copolymer, ethylene Ethylene / ⁇ -olefin copolymer such as 1-butene copolymer
- the semi-aromatic polyamide resin composition includes a semi-aromatic polyamide resin (A), an acid-modified polyolefin resin (B), a fibrous filler (C), and Other resins and additives, resins other than the above, and the like are included as necessary.
- the amount of the semi-aromatic polyamide resin (A) in the semi-aromatic polyamide resin composition of the present invention is such that the semi-aromatic polyamide resin (A), the acid-modified polyolefin resin (B), and the fibrous filler (C). It is preferably 30 to 90% by mass, more preferably 40 to 80% by mass with respect to the total of the above.
- the semi-aromatic polyamide resin (A) is included in the above range, the rigidity of the semi-aromatic polyamide resin composition is easily increased and the toughness is also excellent.
- the amount of the acid-modified polyolefin resin (B) in the semi-aromatic polyamide resin composition is based on the total of the semi-aromatic polyamide resin (A), the acid-modified polyolefin resin (B), and the fibrous filler (C). 1 mass% or more and 23 mass% or less, preferably 3 mass% or more and 20 mass% or less, more preferably 5 mass% or more and less than 18 mass%.
- the amount of the acid-modified polyolefin resin (B) is 23% by mass or less, the affinity with the semi-aromatic polyamide resin (A) can be increased, and the acid-modified polyolefin resin (B) is added to the resin composition. Fine dispersion is possible.
- the total number of moles (MA) of terminal amino groups of the semi-aromatic polyamide resin (A) contained in the resin composition of the present invention and “acid-modified polyolefin resin (MA) contained in the resin composition of the present invention”
- the difference (MA-MB) from the total number of moles (MB) of the acid group of B) and its derivative groups (MB) is preferably 3.0 or more, more preferably 3.0 to 100, still more preferably 5 to 80.
- the difference (MA-MB) is 3.0 or more, the adhesion between the semi-aromatic polyamide resin (A) or the acid-modified polyolefin resin (B) and the fibrous filler (C) is improved, and the mechanical strength is increased. Excellent.
- the “total number of moles of terminal amino groups (MA) of semi-aromatic polyamide resin (A)” contained in the resin composition is the mole of terminal amino groups contained per 1 g of semi-aromatic polyamide resin (A). The number is obtained by neutralization titration using an indicator and is obtained by integrating the amount of the semi-aromatic polyamide resin (A) contained in the resin composition.
- the “total number of moles (MB) of acid groups and derivative groups of acid-modified polyolefin resin (B)” the moles of acid groups or derivative groups contained per gram of acid-modified polyolefin resin (B) are also the same. The number is obtained by neutralization titration using an indicator, and is obtained by integrating the amount of the acid-modified polyolefin resin (B) contained in the resin composition.
- the amount of the fibrous filler (C) contained in the resin composition of the present invention is semi-fragrance from the viewpoint of moldability of the resin composition and mechanical properties (for example, impact resistance) of the obtained molded product. It is preferably in the range of 5 to 60% by mass, preferably 10 to 50% by mass with respect to the total of the group polyamide resin (A), the acid-modified polyolefin resin (B) and the fibrous filler (C). Is more preferable.
- the semi-aromatic polyamide resin composition contains a polymer (for example, olefin polymer) other than the semi-aromatic polyamide resin (A) and the acid-modified polyolefin resin (B) described above,
- the amount is preferably 5% by mass or less, more preferably 3% by mass or less, based on the total mass of the polyamide resin composition.
- the semi-aromatic polyamide resin composition of the present invention includes a semi-aromatic polyamide resin (A) and an acid-modified polyolefin resin (B). And since the softening point temperature of the acid-modified polyolefin resin (B) is relatively high, etc., when it is formed into a molded product, it is the frictional force on the surface of the molded product at room temperature (23 ° C.) and the use temperature for, for example, automobile use. The change from the frictional force in the vicinity of 90 ° C. becomes small. That is, even if the temperature changes, the hardness of the surface of the molded product hardly changes.
- LFM horizontal force microscope
- a horizontal force microscope is an application of an atomic force microscope (AFM), and is a technique for measuring the frictional force of a sample surface.
- the LFM detects a displacement (twist) in the horizontal direction when the cantilever is scanned in the horizontal direction. This amount of twist is detected as a voltage value, and the greater this value, the greater the frictional force, ie the hardness of the sample surface.
- the frictional behavior of polymers is related to the thermal motion characteristics of molecular chains. Therefore, by measuring not only the bulk thermal characteristics of the semi-aromatic polyamide resin composition of the present invention but also the thermal characteristics of the outermost surface, that is, the frictional force, it is possible to evaluate the change in surface hardness accompanying the temperature change.
- the frictional force on the surface of the resin composition of the present invention is measured according to the following procedures (1) to (4) using a horizontal force microscope (LFM).
- the ratio (T (90) / T (23)) of the frictional force T (23) at 23 ° C. to the frictional force T (90) at 90 ° C. is preferably 5 or less, and more preferably 3 or less. .
- the ratio (T (90) / T (23)) between the frictional force T (23) at 23 ° C. and the frictional force T (90) at 90 ° C. measured using a horizontal force microscope (LFM) is 5 or less. And the hardness change at the time of a temperature change from room temperature to 90 degreeC decreases, and heat shock tolerance increases.
- the ratio of the frictional force is adjusted by the softening point of the acid-modified polyolefin resin (B) and the amount of the acid-modified polyolefin resin (B).
- the resin composition of the present invention and another resin are molded by multicolor molding or the like, and a test piece in which a member obtained from the resin composition of the present invention and a member made of another resin are joined is created. And the joining strength A of the said junction part is measured.
- the test of leaving the test piece in ATF oil adjusted to 130 ° C. for 5 minutes and then leaving it in ATF oil cooled to 23 ° C. (or ⁇ 40 ° C.) for 5 minutes is repeated about 100 times.
- the bonding strength B of the bonded portion of the test piece obtained after the heat cycle is measured.
- the molded product using the semi-aromatic polyamide resin composition of the present invention can maintain the bonding strength of the bonded portion with the component made of other resin even if a long-term heat cycle test is performed, Long-term reliable resin compositions and molded products are expected to be obtained.
- the glass transition temperature of the semiaromatic polyamide resin composition of the present invention is measured with a differential scanning calorimeter (for example, DSC220C type, manufactured by Seiko Instruments Inc.), it is derived from the semiaromatic polyamide resin (A).
- the melting point (Tm) of the glass is clearly measured, and as described above, the glass transition temperature is 90 to 180 ° C.
- the melting point (Tm) derived from the semi-aromatic polyamide resin (A) is within the above range, the mechanical strength of the molded product obtained from the resin composition is excellent.
- the method for measuring the glass transition temperature can be the same as the method for measuring the glass transition temperature of the semi-aromatic polyamide resin (A) described above.
- the semi-aromatic polyamide resin composition of the present invention preferably has a volume resistivity of 10 10 ⁇ cm or more, more preferably 10 11 ⁇ cm, and even more preferably 10 12 ⁇ cm or more.
- the volume specific resistance value of the semi-aromatic polyamide resin composition is 10 10 ⁇ cm or more, the insulating property becomes good when formed into a molded product.
- the volume resistivity measurement method is based on ASTM D257: 2007, and is measured using a model 8340A manufactured by ADC Corporation.
- the semi-aromatic polyamide resin composition of the present invention comprises the above-mentioned semi-aromatic polyamide resin (A), acid-modified polyolefin resin (B) and fibrous filler (C), and If necessary, other components can be obtained by a known method, for example, a method of mixing with a Henschel mixer, a V blender, a ribbon blender, a tumbler blender, or the like. Further, after mixing the respective components, it may be further kneaded and granulated or pulverized by a single screw extruder, a multi-screw extruder, a kneader, a Banbury mixer or the like.
- the molded article comprising the semi-aromatic polyamide resin composition of the present invention has high rigidity and excellent impact resistance as described above. Furthermore, there is little change in hardness due to temperature change. Therefore, it can be applied to various uses.
- Examples of the use (molded product) of the semi-aromatic polyamide resin composition of the present invention include a radiator grill, a rear spoiler, a wheel cover, a wheel cap, a cowl vent grill, an air outlet louver, an air scoop, a food bulge, a fender, Automotive exterior parts such as back doors; cylinder head covers, engine mounts, air intake manifolds, throttle bodies, air intake pipes, radiator tanks, radiator supports, water pump inlets, water pump outlets, thermostat housings, cooling Fan, fan shroud, oil pan, oil filter housing, oil filler cap, oil level gauge, timing belt, timing belt cover Engine compartment parts for automobiles such as engine covers; fuel caps, fuel filler tubes, fuel tanks for automobiles, fuel sender modules, fuel cutoff valves, quick connectors, canisters, fuel delivery pipes, fuel filler necks, etc.
- Automotive fuel system parts Automobile drive system parts such as shift levers and housings; Propeller shafts; Automobile chassis parts such as stabilizer bars and linkage rods; Window regulators, door locks, door handles, outside door mirrors and stays , Accelerator pedals, pedal modules, seal rings, bearings, bearing retainers, gears, actuators and other functional parts for automobiles; wire harnesses, connectors, relays Automotive electronics parts such as racks, sensor housings, encapsulations, ignition coils, distributor caps, etc .; fuel system parts for general equipment such as fuel tanks for general equipment (mowing machines, lawn mowers, chainsaws, etc.) Electrical and electronic parts such as connectors and LED reflectors are included.
- the semi-aromatic polyamide resin composition of the present invention is excellent in both properties such as toughness such as impact resistance and elongation and mechanical properties such as tensile strength, and also has heat resistance, low water absorption and chemical resistance.
- fuel tanks for automobiles, quick connectors, bearing retainers, fuel tanks for general equipment, fuel caps, fuel filler necks, fuel sender modules, wheel caps, fenders, etc. can be preferably used as a back door.
- the semi-aromatic polyamide resin composition of the present invention is excellent in heat shock property of a joined part with another material. Therefore, the semi-aromatic polyamide resin composition of the present invention includes a component derived from the semi-aromatic polyamide resin composition of the present invention and a multi-color molded product and a multilayer molded product including components derived from other materials, Is preferred.
- other materials that can be joined to the semi-aromatic polyamide resin composition of the present invention include resin compositions containing other resins than the above-mentioned semi-aromatic polyamide resin (A), metals, ceramics, and the like. In addition, two or more of these may be included in the multicolor molded product or the multilayer molded product.
- the semi-aromatic polyamide resin composition of the present invention is particularly composed of a part composed of the semi-aromatic polyamide resin composition of the present invention and a part composed of a resin composition other than the semi-aromatic polyamide resin composition of the present invention. It is preferably used for a multicolor molded product having a semi-aromatic polyamide resin composition of the present invention and a multilayer molded product containing a resin composition other than the semi-aromatic polyamide resin composition of the present invention. can do.
- Resins that can be included in other materials are, for example, low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, ethylene / propylene copolymer, ethylene / butene copolymer, ethylene / vinyl acetate copolymer, ethylene / acetic acid Saponified vinyl copolymer, ethylene / acrylic acid copolymer, ethylene / methacrylic acid copolymer, ethylene / methyl acrylate copolymer, ethylene / methyl methacrylate copolymer, ethylene / ethyl acrylate copolymer, Polyolefin resin such as polybutadiene, ethylene / propylene / diene copolymer, polystyrene; polybutylene terephthalate, polyethylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, polyarylate, liquid crystal polyester Polyester resins such as poly
- the semi-aromatic polyamide resin composition of the present invention can be suitably used for various molded products such as injection molded products and extrusion molded products.
- the semi-aromatic polyamide resin composition of the present invention not only has excellent heat shock resistance, but also excellent performance such as mechanical strength, heat resistance and chemical resistance.
- Products and molded articles made of polyamide resin compositions containing them can be used in a wide range of applications such as electrical / electronic materials, automotive parts, electric vehicle parts, fuel cell vehicle parts, industrial materials, industrial materials, and household goods. In particular, it can be suitably used for automobiles, electric vehicles, and fuel cell vehicle parts.
- the melting point (Tm) of the semi-aromatic polyamide resin (A) was measured using a differential scanning calorimeter (DSC220C type, manufactured by Seiko Instruments Inc.) as a measuring device. Specifically, about 5 mg of semi-aromatic polyamide resin (A) was sealed in an aluminum pan for measurement and heated from room temperature to 330 ° C. at 10 ° C./min. In order to completely melt the semi-aromatic polyamide resin (A), it was kept at 330 ° C. for 5 minutes and then cooled to 30 ° C. at 10 ° C./min. After 5 minutes at 30 ° C., the second heating was performed to 330 ° C.
- the peak temperature (° C.) at the second heating was defined as the melting point (Tm) of the semi-aromatic polyamide resin (A), and the displacement point corresponding to the glass transition was defined as the glass transition temperature (Tg).
- melt flow rate (MFR) The melt flow rate (MFR) of the acid-modified polyolefin resin (B) was measured at 190 ° C. under a load of 2.16 kg according to ASTM D1238. The unit is g / 10 min.
- the density of the acid-modified polyolefin resin (B) was measured at a temperature of 23 ° C. using a density gradient tube in accordance with JIS K7112. The density was measured at a temperature of 23 ° C. using a density gradient tube in accordance with JIS K7112.
- composition The amount (% by mass) of the acid-modified polyolefin resin (B) in the resin composition, the composition of the olefin polymer skeleton, and the amount (% by mass) of the acid group-containing structural unit were measured by 13 C-NMR.
- the measurement conditions are as follows.
- the molar ratio of 1,6-diaminohexane to 2-methyl-1,5-diaminopentane was 50:50.
- the reaction product produced in the reactor was withdrawn into a receiver connected to the reactor and set at a pressure of about 10 kg / cm 2 lower, and the intrinsic viscosity [ ⁇ ] was 0.15 dl /
- a polyamide precursor g was obtained.
- this polyamide precursor was dried and melt polymerized at a cylinder setting temperature of 330 ° C. using a twin screw extruder to obtain a semi-aromatic polyamide resin (A-1).
- the composition of this aromatic polyamide resin (A-1) is as follows.
- the 1,6-diaminohexane component unit content in the diamine component unit was 50 mol%; the 2-methyl-1,5-diaminopentane component unit content was 50 mol%.
- the obtained polyamide resin had an intrinsic viscosity [ ⁇ ] of 1.0 dl / g, a melting point Tm of 300 ° C., and a glass transition temperature of 140 ° C. The obtained results are summarized in Table 1.
- the reaction was continued for 1 hour as it was, and then discharged from the spray nozzle installed at the bottom of the autoclave to extract the low condensate. Thereafter, the low condensate was cooled to room temperature, pulverized to a particle size of 1.5 mm or less with a pulverizer, and dried at 110 ° C. for 24 hours.
- the obtained low condensate had a water content of 3600 ppm and an intrinsic viscosity [ ⁇ ] of 0.14 dl / g.
- this low condensate was placed in a shelf type solid phase polymerization apparatus, and after the nitrogen substitution, the temperature was raised to 220 ° C. over about 1 hour 30 minutes.
- the semi-aromatic polyamide resin (A-2) obtained had an intrinsic viscosity [ ⁇ ] of 1.0 dl / g, a melting point Tm of 310 ° C., and a glass transition temperature of 85 ° C.
- the obtained results are summarized in Table 1.
- the reaction was continued for 1 hour as it was, and then discharged from the spray nozzle installed at the bottom of the autoclave to extract the low condensate. Then, after cooling to room temperature, the low condensate was pulverized to a particle size of 1.5 mm or less with a pulverizer and dried at 110 ° C. for 24 hours. The obtained low condensate had a water content of 4100 ppm and an intrinsic viscosity [ ⁇ ] of 0.15 dl / g. Next, this low condensate was put into a shelf type solid phase polymerization apparatus, and after the nitrogen substitution, the temperature was raised to 180 ° C. over about 1 hour and 30 minutes.
- the obtained polyamide resin had an intrinsic viscosity [ ⁇ ] of 1.0 dl / g, a melting point Tm of 330 ° C., and a glass transition temperature of 125 ° C.
- Table 1 The obtained results are summarized in Table 1.
- the semi-aromatic polyamide resin (A-4) obtained had an intrinsic viscosity [ ⁇ ] of 1.2 dl / g, a melting point Tm of 300 ° C., and a glass transition temperature of 120 ° C.
- the obtained results are summarized in Table 1.
- the molar ratio of 1,6-diaminohexane to 2-methyl-1,5-diaminopentane was 50:50.
- the reaction product produced in the reactor was withdrawn into a receiver connected to the reactor and set at a pressure of about 10 kg / cm 2 lower, and the intrinsic viscosity [ ⁇ ] was 0.15 dl /
- a polyamide precursor g was obtained.
- the polyamide precursor was dried and melt polymerized at a cylinder setting temperature of 330 ° C. using a twin screw extruder to obtain a semi-aromatic polyamide resin (A-5).
- the composition of this aromatic polyamide resin (A-5) is as follows.
- the 1,6-diaminohexane component unit content in the diamine component unit was 50 mol%; the 2-methyl-1,5-diaminopentane component unit content was 50 mol%.
- the obtained polyamide resin had an intrinsic viscosity [ ⁇ ] of 1.0 dl / g, a melting point Tm of 300 ° C., and a glass transition temperature of 138 ° C. The obtained results are summarized in Table 1.
- a semi-aromatic polyamide resin (A-1) (64% by mass), an acid-modified polyolefin resin (B-2) (5% by mass), a heat-resistant aging agent (1% by mass), and a tumbler blender were used for mixing.
- the raw material is melt-kneaded at a cylinder temperature (melting point (Tm) of semi-aromatic polyamide resin (A) +15) ° C. at Nippon Steel Works TEX30 ⁇ , and from any position of the twin screw extruder. 30% by mass of glass fiber (Owens Corning) was added and melt-kneaded. Then, it extruded to the strand form and cooled with the water tank.
- the strand was taken up with a pelletizer and cut to obtain a pellet-shaped resin composition of the present invention.
- the Tg derived from the semi-aromatic polyamide resin (A) was 138 ° C.
- the obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3.
- Example 2 59% by mass of semi-aromatic polyamide resin (A-1), 10% by mass of acid-modified polyolefin resin (B-2), 30% by mass of glass fiber (manufactured by Owens Corning), 1% of heat aging agent %, A pellet-shaped resin composition of the present invention of Example 2 was obtained in the same manner as in Example 1, except that the mixing was performed using a tumbler blender. About the obtained pellet, when it measured by DSC similarly to the above-mentioned semi-aromatic polyamide resin (A), Tg derived from a semi-aromatic polyamide resin (A) was 138 degreeC. The obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3. Moreover, the result of having performed the LFM measurement about the said resin composition was shown in FIG.
- Example 3 49% by mass of semi-aromatic polyamide resin (A-1), 20% by mass of acid-modified polyolefin resin (B-2), 30% by mass of glass fiber (manufactured by Owens Corning), 1% of heat aging agent %, A pellet-shaped resin composition of the present invention of Example 3 was obtained in the same manner as in Example 1 except that mixing was performed using a tumbler blender. About the obtained pellet, when it measured by DSC similarly to the above-mentioned semi-aromatic polyamide resin (A), Tg derived from a semi-aromatic polyamide resin (A) was 139 degreeC. The obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3.
- Example 4 59% by mass of semi-aromatic polyamide resin (A-1), 7% by mass of acid-modified polyolefin resin (B-2), 3% by mass of acid-modified polyolefin resin (B-3), glass fiber (Owens Corning)
- the resin composition of the present invention in the form of pellets of Example 4 was prepared in the same manner as in Example 1 except that 30% by mass) and 1% by mass of heat aging agent were mixed using a tumbler blender. Obtained.
- Tg derived from a semi-aromatic polyamide resin (A) was 138 degreeC.
- the obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3. Moreover, the result of having performed LFM measurement about the said resin composition was shown in FIG.
- Example 5 59% by mass of semi-aromatic polyamide resin (A-4), 10% by mass of acid-modified polyolefin resin (B-2), 30% by mass of glass fiber (made by Owens Corning), and 1% by mass of heat-resistant aging agent %, A pellet-shaped resin composition of the present invention of Example 5 was obtained in the same manner as in Example 1 except that mixing was performed using a tumbler blender. About the obtained pellet, when it measured by DSC similarly to the above-mentioned semi-aromatic polyamide resin (A), Tg derived from a semi-aromatic polyamide resin (A) was 119 degreeC. The obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3.
- Comparative Example 1 Except mixing 69% by mass of semi-aromatic polyamide resin (A-1), 30% by mass of glass fiber (Owens Corning), 1% by mass of heat aging agent, and using a tumbler blender. By the same method as Example 1, the pellet-shaped resin composition of Comparative Example 1 was obtained. About the obtained pellet, when it measured by DSC similarly to the above-mentioned semi-aromatic polyamide resin (A), Tg derived from a semi-aromatic polyamide resin (A) was 139 degreeC. The obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3.
- Comparative Example 2 44% by mass of semi-aromatic polyamide resin (A-1), 25% by mass of acid-modified polyolefin resin (B-2), 30% by mass of glass fiber (made by Owens Corning), 1% of heat aging agent %, A pellet-shaped resin composition of Comparative Example 2 was obtained in the same manner as in Example 1, except that mixing was performed using a tumbler blender. About the obtained pellet, when it measured by DSC similarly to the above-mentioned semi-aromatic polyamide resin (A), Tg derived from a semi-aromatic polyamide resin (A) was 136 degreeC. The obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3.
- Comparative Example 3 A pellet-shaped resin composition of Comparative Example 3 was obtained in the same manner as in Example 2, except that the semiaromatic polyamide resin (A-1) was changed to (A-2). About the obtained pellet, when it measured by DSC similarly to the above-mentioned semi-aromatic polyamide resin (A), Tg derived from a semi-aromatic polyamide resin (A) was 85 degreeC. The obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3.
- Example 6 A pellet-shaped resin composition of Example 6 was obtained in the same manner as in Example 2, except that the semiaromatic polyamide resin (A-1) was changed to (A-3). About the obtained pellet, when it measured by DSC similarly to the above-mentioned semi-aromatic polyamide resin (A), Tg derived from a semi-aromatic polyamide resin (A) was 125 degreeC. The obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3.
- Comparative Example 4 A pellet-shaped resin composition of Comparative Example 4 was obtained in the same manner as in Example 2, except that the acid-modified polyolefin resin (B-2) was changed to (B-1). About the obtained pellet, when it measured by DSC similarly to the above-mentioned semi-aromatic polyamide resin (A), Tg derived from a semi-aromatic polyamide resin (A) was 139 degreeC. The obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3.
- Comparative Example 5 A pellet-shaped resin composition of Comparative Example 5 was obtained in the same manner as in Example 2 except that the acid-modified polyolefin resin (B-2) was changed to (B-3). About the obtained pellet, when it measured by DSC similarly to the above-mentioned semi-aromatic polyamide resin (A), Tg derived from the semi-aromatic polyamide resin (A) was 138 degreeC. The obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3. Moreover, the result of having performed the LFM measurement about the said resin composition was shown in FIG.
- Comparative Example 6 A pellet-shaped resin composition of Comparative Example 6 was obtained in the same manner as in Example 2 except that the acid-modified polyolefin resin (B-2) was changed to (B-4). About the obtained pellet, when it measured by DSC similarly to the above-mentioned semi-aromatic polyamide resin (A), Tg derived from the semi-aromatic polyamide resin (A) was 138 degreeC. The obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3.
- Example 7 64% by mass of semi-aromatic polyamide resin (A-5), 5% by mass of acid-modified polyolefin resin (B-2), 30% by mass of glass fiber (made by Owens Corning), and 1% of heat aging agent %, A pellet-shaped resin composition of Example 7 was obtained in the same manner as in Example 1 except that mixing was performed using a tumbler blender. About the obtained pellet, when it measured by DSC similarly to the above-mentioned semi-aromatic polyamide resin (A), Tg derived from a semi-aromatic polyamide resin (A) was 138 degreeC. The obtained pellet-shaped resin composition was tested as described below. The results obtained are summarized in Table 3.
- IZOD impact strength Using the following injection molding machine, a test piece with a notch and a thickness of 3.2 mm adjusted under the following molding conditions was prepared, and in accordance with ASTM D256, in an atmosphere at a temperature of 23 ° C. and a relative humidity of 50% and The IZOD impact strength was measured in an atmosphere at a temperature of ⁇ 40 ° C. and a relative humidity of 50%.
- Molding machine SE50DU, manufactured by Sumitomo Heavy Industries, Ltd. Molding machine cylinder temperature: melting point (Tm) of semi-aromatic polyamide resin (A) + 15 ° C., mold temperature: Tg of semi-aromatic polyamide resin (A) + 20 ° C.
- the measurement method was the method (1) to (4).
- (1) Method for adjusting sample for LFM Using the following injection molding machine, test pieces were prepared under the following conditions for each resin composition. Each test piece had a length: 90 mm, a width: 48 mm, and a thickness: 3 mm. A test piece having a length: 10 mm, a width: 10 mm, and a thickness: 3 mm was cut out from the test piece to obtain an LFM test piece.
- Molding machine Sumitomo Heavy Industries, Ltd., SG50 Molding machine cylinder temperature: melting point (Tm) of semi-aromatic polyamide resin (A) + 15 ° C., mold temperature: Tg of semi-aromatic polyamide resin (A) + 20 ° C.
- Amount of terminal amino group of semi-aromatic polyamide resin (A) contained in the resin composition 1 g of each semi-aromatic polyamide resin (A) was dissolved in 35 mL of phenol, and 2 mL of methanol was mixed to prepare a sample solution. Then, using thymol blue as an indicator, the sample solution was titrated with a 0.01N aqueous HCl solution to identify the amount of terminal amino groups ([NH 2 ], unit: mmol / kg). And the quantity (mol) of the terminal amino group contained in the resin composition was calculated
- Amount of acid group and derivative group thereof in acid-modified polyolefin resin (B) contained in resin composition Titration using 5N pellets of acid-modified polyolefin resin (B) dissolved in 170 mL of toluene and adding 30 mL of ethanol, using phenolphthalein as an indicator and a 0.1 N KOH ethanol solution And the total amount (unit: mmol / kg) of acid groups and derivative groups thereof of the acid-modified polyolefin resin (B) was specified.
- the test piece was produced on the following conditions of each resin composition using the following injection molding machine. Each test piece has a length: 90 mm, a width: 48 mm, and a thickness: 3 mm. A test piece having a length: 10 mm, a width: 10 mm, and a thickness: 3 mm is cut out from the test piece and used for volume resistivity evaluation. A test piece was obtained. Molding machine: Sumitomo Heavy Industries, Ltd., SG50 Molding machine cylinder temperature: melting point (Tm) of semi-aromatic polyamide resin (A) + 15 ° C., mold temperature: Tg of semi-aromatic polyamide resin (A) + 20 ° C. Using the produced test piece, the specific resistivity was determined according to ASTM D257: 2007 double ring electrode method using a model 8340A manufactured by ADC Corporation.
- the test piece was produced on the following conditions of each resin composition using the following injection molding machine.
- the test piece was formed in a shape having a thickness of 3.2 mm having a joint part (weld part) between the resins in the center part.
- Molding machine Injection molding machine Tupar TR40S3A (manufactured by Sodick Plastic Co., Ltd.)
- Molding machine cylinder temperature melting point (Tm) of semi-aromatic polyamide resin (A) + 15 ° C.
- Mold temperature Tg of semi-aromatic polyamide resin (A) + 20 ° C
- the test in which the test piece was left in ATF oil adjusted to 130 ° C. for 5 minutes and then left in ATF oil cooled to ⁇ 40 ° C.
- the acid-modified polyolefin resin (B-2) contains the acid-modified polyolefin resin (B-3) in an amount of 3% by mass in the total resin composition. Shows well-balanced data.
- Example 6 since the aliphatic diamine component of the semi-aromatic polyamide resin (A) has no side chain alkylene diamine, the IZOD impact strength is slightly small. The dispersibility of the acid-modified polyolefin resin (B) is slightly low, so it is estimated that it was difficult to increase the IZOD impact strength.
- the value of MA-MB was less than 3.0, so the tensile strength and impact strength were slightly smaller than in Example 1.
- Comparative Example 1 does not contain the acid-modified polyolefin resin (B), it can be seen that the IZOD impact strength is small. It can be seen that Comparative Example 2 has low tensile strength and flexural modulus because of the high content of the acid-modified polyolefin resin (B). Since Comparative Example 3 uses the semi-aromatic polyamide resin (A) having a low glass transition temperature, it can be seen that the ratio of the frictional force between 23 ° C. and 90 ° C., that is, the change in hardness is high. Since Comparative Example 4 uses the acid-modified polyolefin resin (B) having a high density, it can be seen that the IZOD impact strength is small.
- Comparative Examples 5 and 6 use the acid-modified polyolefin resin (B) having a low density and a low Vicat softening point, as shown in FIG. 3, the ratio of friction force between 23 ° C. and 90 ° C., that is, the hardness change is high. I understand that.
- the semi-aromatic polyamide resin composition of the present invention is excellent in high rigidity, impact resistance, and heat shock resistance. Furthermore, when a semi-aromatic polyamide resin composition is molded, since the strength of the joint can be maintained when the resins are joined together, it can be used in a wide range of applications such as electrical / electronic materials, automotive parts, industrial materials, industrial materials, and household products. In particular, it can be suitably used for automobile parts.
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Abstract
Description
[1]ジカルボン酸成分単位及び脂肪族系ジアミン成分単位から構成される半芳香族ポリアミド樹脂(A)と、酸変性ポリオレフィン樹脂(B)と、繊維状充填剤(C)と、を含む半芳香族ポリアミド樹脂組成物であって、前記半芳香族ポリアミド樹脂(A)は、前記ジカルボン酸成分単位の総モル数に対して、テレフタル酸成分単位を60モル%以上含み、前記半芳香族ポリアミド樹脂(A)と、前記酸変性ポリオレフィン樹脂(B)と、前記繊維状充填剤(C)との合計100質量部に対し、前記酸変性ポリオレフィン樹脂(B)を1.0~23質量部含み、前記半芳香族ポリアミド樹脂組成物は、下記要件(1)を満たし、前記酸変性ポリオレフィン樹脂(B)は、下記要件(2)を満たす、半芳香族ポリアミド樹脂組成物。
(1)DSCにより測定される半芳香族ポリアミド樹脂(A)由来のガラス転移温度が90℃~180℃の範囲にある
(2)ASTM D1525に準拠して測定されるビカット軟化点が45℃~110℃の範囲にある
[3]前記酸変性ポリオレフィン樹脂(B)は、オレフィン重合体を不飽和カルボン酸またはその誘導体で変性した樹脂であり、前記半芳香族ポリアミド樹脂組成物が含む、前記半芳香族ポリアミド樹脂(A)の末端アミノ基の総モル数(MA)と、前記酸変性ポリオレフィン樹脂(B)の酸基及びその誘導体基の総モル数(MB)とが、下記要件(3)を満たす、[1]または[2]に記載の半芳香族ポリアミド樹脂組成物。
(3)MA-MB≧3.0
[4]前記酸変性ポリオレフィン樹脂(B)のASTM D1525に準拠して測定されるビカット軟化点が、90℃~110℃の範囲にある、[1]~[3]のいずれかに記載の半芳香族ポリアミド樹脂組成物。
[5]前記半芳香族ポリアミド樹脂(A)の前記脂肪族系ジアミン成分単位は、下記の要件(a1)及び要件(a2)のうち、少なくとも一方を満たす、[1]~[4]のいずれかに記載の半芳香族ポリアミド樹脂組成物。
(a1)炭素原子数4~18の直鎖アルキレンジアミン成分単位を、前記脂肪族ジアミン成分単位の総モル数に対して40~90モル%含む
(a2)炭素原子数4~18の側鎖アルキレンジアミン成分単位を、前記脂肪族ジアミン成分単位の総モル数に対して10~60モル%含む
[7]前記直鎖アルキレンジアミン成分単位が、1,6-ジアミノヘキサン成分単位を含み、前記側鎖アルキレンジアミン成分単位が、2-メチル-1,5-ペンタジアミン成分単位を含む、[5]または[6]に記載の半芳香族ポリアミド樹脂組成物。
[8]前記脂肪族ジアミン成分単位が、1,6-ジアミノヘキサン成分単位を45モル%超55モル%未満、2-メチル-1,5-ペンタジアミン成分単位を45モル%超55モル%未満含む、[7]に記載の半芳香族ポリアミド樹脂組成物。
[9]前記直鎖アルキレンジアミン成分単位が、1,9-ノナンジアミン成分単位を含み、前記側鎖アルキレンジアミン成分単位が、2-メチル-1,8-オクタンジアミン成分単位を含む、[5]に記載の半芳香族ポリアミド樹脂組成物。
[11]前記半芳香族ポリアミド樹脂(A)の前記ジカルボン酸成分単位が、イソフタル酸成分単位をさらに含み、かつ前記テレフタル酸成分単位と、前記イソフタル酸成分単位とのモル比が、60/40~99.9/0.1であり、かつ前記脂肪族ジアミン成分単位が、1,6-ジアミノヘキサン成分単位を45モル%超55モル%未満、2-メチル-1,5-ペンタジアミン成分単位を45モル%超55モル%未満含む、[10]に記載の半芳香族ポリアミド樹脂組成物。
[12]前記酸変性ポリオレフィン樹脂(B)が下記要件(4)及び(5)を満たす、[3]~[11]のいずれかに記載の半芳香族ポリアミド樹脂組成物。
(4)前記不飽和カルボン酸またはその誘導体のグラフト量が0.01~1.5質量%である
(5)JIS K7112に準拠して測定される密度が890~940kg/m3の範囲にある
[13]前記半芳香族ポリアミド樹脂(A)を30~90質量%、前記酸変性ポリオレフィン樹脂(B)を1~20質量%、前記繊維状充填剤(C)を5~60質量%含む(ただし、前記半芳香族ポリアミド樹脂(A)、前記酸変性ポリオレフィン樹脂(B)、及び前記繊維状充填剤(C)の合計は100質量%である)、[1]~[12]のいずれかに記載の半芳香族ポリアミド樹脂組成物。
[14]前記[1]~[13]のいずれかに記載の半芳香族ポリアミド樹脂組成物を含む成型品。
本発明の半芳香族ポリアミド樹脂組成物(以下、単に「樹脂組成物」とも称する)には、半芳香族ポリアミド樹脂(A)と、酸変性ポリオレフィン樹脂(B)と、繊維状充填剤(C)とが含まれる。
半芳香族ポリアミド樹脂(A)には、芳香族カルボン酸(テレフタル酸)由来の構成成分と、脂肪族ジアミン由来の構成成分とが含まれる。当該半芳香族ポリアミド樹脂(A)の、示差走査熱量測定(DSC)で測定されるガラス転移温度(Tg)は90~180℃であり、110~150℃であることが好ましい。半芳香族ポリアミド樹脂(A)樹脂組成物に、当該Tgを有する半芳香族ポリアミド樹脂(A)を含めることで、樹脂組成物の機械強度を高めることができる。
[η]=ηSP/(C(1+0.205ηSP))
[η]:極限粘度(dl/g)
ηSP:比粘度
C:試料濃度(g/dl)
t:試料溶液の流下秒数(秒)
t0:ブランク硫酸の流下秒数(秒)
ηSP=(t-t0)/t0
酸変性ポリオレフィン樹脂(B)とは、オレフィン重合体が酸基、あるいはその誘導体を含む化合物で変性された樹脂をいい、オレフィン重合体からなる骨格に、酸基、あるいはその誘導体基を含む構造単位(酸基含有構造単位)が結合した構造を有する。
ビカット軟化点=α1×β1/(β1+β2)+α2×β2/(β1+β2)
繊維状充填剤(C)は、特に制限されず、無機化合物からなる繊維状充填剤、有機化合物からなる繊維状充填剤のいずれでもありうる。繊維状充填剤(C)の例には、ガラス繊維、炭素繊維、全芳香族ポリアミド繊維(例えば、ポリパラフェニレンテレフタルアミド繊維、ポリメタフェニレンテレフタルアミド繊維、ポリパラフェニレンイソフタルアミド繊維、ポリメタフェニレンイソフタルアミド繊維、ジアミノジフェニルエーテルとテレフタル酸またはイソフタル酸との縮合物から得られる繊維など)、ホウ素繊維、液晶ポリエステル繊維等が含まれる。樹脂組成物には、繊維状充填剤(C)が1種のみ含まれてもよく、2種以上含まれてもよい。繊維状充填剤(C)は、得られる成型品の機械的特性および耐熱性が高まるとの観点から、特に、ガラス繊維、炭素繊維、全芳香族ポリアミド繊維から選ばれる少なくとも1種であることが好ましい。
本発明の樹脂組成物は、発明の効果を損なわない範囲で、用途に応じて、任意の添加剤が含まれていてもよい。添加剤の例には、酸化防止剤(フェノール類、アミン類、イオウ類、リン類等)、充填剤(クレー、シリカ、アルミナ、タルク、カオリン、石英、マイカ、グラファイト等)、耐熱安定剤(ラクトン化合物、ビタミンE類、ハイドロキノン類、ハロゲン化銅、ヨウ素化合物等)、光安定剤(ベンゾトリアゾール類、トリアジン類、ベンゾフェノン類、ベンゾエート類、ヒンダードアミン類、オギザニリド類等)、難燃剤(臭素系、塩素系、リン系、アンチモン系、無機系等)、滑剤、蛍光増白剤、可塑剤、増粘剤、帯電防止剤、離型剤、顔料、結晶核剤、種々公知の添加剤でありうる。
前述のように、半芳香族ポリアミド樹脂組成物には、半芳香族ポリアミド樹脂(A)、酸変性ポリオレフィン樹脂(B)、繊維状充填剤(C)、及び必要に応じて他の樹脂や添加剤や、上記以外の樹脂等が含まれる。
本発明の半芳香族ポリアミド樹脂組成物には、半芳香族ポリアミド樹脂(A)と、酸変性ポリオレフィン樹脂(B)とが含まれる。そして酸変性ポリオレフィン樹脂(B)の軟化点温度が比較的高いこと等から、成型品としたときに、室温(23℃)における成型品表面の摩擦力と、例えば自動車用途などの使用温度である90℃付近における摩擦力との変化が小さくなる。つまり、温度変化が生じても、成型品表面の硬度が変化し難い。その結果、本発明の樹脂組成物から得られる成型品と、他の樹脂からなる部材とを接合した場合に、これらの界面おいて硬度変化が生じ難く、ヒートショックを繰り返しても接合部の強度が保たれる。
(1)LFM用サンプルの調整
下記の射出成型機を用い、下記の成型条件で調整した長さ:90mm、幅:48mm、厚さ:3mmの試験片を作成する。そして、その試験片から長さ:10mm、幅:10mm、厚さ:3mmの試験片を切り出し、LFMの試験片とする。
成型機:住友重機械工業(株)社製、SG50
成型機シリンダー温度:半芳香族ポリアミド樹脂(A)の融点+15℃、金型温度:半芳香族ポリアミド樹脂(A)のTg+20℃
(2)高真空条件下(1.0×10-4Pa以下)、上記サンプルを用いて、水平力顕微鏡(株式会社日立ハイテクサイエンス製 環境制御型プローブ顕微鏡NanoNavi/E-sweep)のプローブであるカンチレバー(バネ定数0.1N/m)の探針を4nNの荷重で押しつけながら、膜面に対し平行で、かつカンチレバーの方向に対し垂直方向に、振幅1μmを周期0.5Hzで往復させたときのカンチレバーの捻れ量から計算される値(水平力)を、温度10℃~121℃の範囲において、1℃毎に計測する。
(3)前記(2)で得られた摩擦力を温度に対してプロットする。
(4)前記(3)のプロットを観察し、23℃における摩擦力T(23)と90℃における摩擦力T(90)の比(硬度変化=T(90)/T(23))を求める。
本発明の半芳香族ポリアミド樹脂組成物は、前述の半芳香族ポリアミド樹脂(A)、酸変性ポリオレフィン樹脂(B)および繊維状充填剤(C)、ならびに必要に応じてその他の成分を、公知の方法、例えばヘンシェルミキサー、Vブレンダー、リボンブレンダー、タンブラーブレンダーなどで混合する方法で得られる。また各成分の混合後、さらに一軸押出機、多軸押出機、ニーダー、バンバリーミキサーなどで溶融混練し、造粒あるいは粉砕を行ってもよい。
本発明の半芳香族ポリアミド樹脂組成物を含む成型品は、前述のように、剛性が高く、耐衝撃性に優れる。またさらに、温度変化による硬度変化も少ない。したがって、各種用途に適用が可能である。
以下の実施例及び比較例等において、各種成分の分析は、以下の方法で行った。
〔極限粘度[η]〕
半芳香族ポリアミド樹脂(A)の極限粘度[η]は、測定装置としてウベローデ粘度計を用い、温度25℃、96.5%硫酸中で測定した。具体的には、約0.5gの半芳香族ポリアミド樹脂(A)を96.5%濃硫酸50mlに溶解させた。得られた溶液の、25度±0.05℃の条件下での流下秒数を、ウベローデ粘度計を使用して測定し、以下の式に基づき算出した。
[η]=ηSP/(C(1+0.205ηSP))
[η]:極限粘度(dl/g)
ηSP:比粘度
C:試料濃度(g/dl)
t:試料溶液の流下秒数(秒)
t0:ブランク硫酸の流下秒数(秒)
ηSP=(t-t0)/t0
半芳香族ポリアミド樹脂(A)の融点(Tm)は、測定装置として示差走査熱量計(DSC220C型、セイコーインスツル(株)製)を用いて測定した。具体的には、約5mgの半芳香族ポリアミド樹脂(A)を測定用アルミニウムパン中に密封し、室温から10℃/minで330℃まで加熱した。半芳香族ポリアミド樹脂(A)を完全融解させるために、330℃で5分間保持し、次いで、10℃/minで30℃まで冷却した。30℃で5分間置いた後、10℃/minで330℃まで2度目の加熱を行なった。この2度目の加熱でのピーク温度(℃)を半芳香族ポリアミド樹脂(A)の融点(Tm)とし、ガラス転移に相当する変位点をガラス転移温度(Tg)とした。
酸変性ポリオレフィン樹脂(B)のメルトフローレート(MFR:MeltFlow Rate)は、ASTM D1238に準拠し、190℃で2.16kgの荷重にて測定した。単位は、g/10minである。
酸変性ポリオレフィン樹脂(B)の密度は、密度はJIS K7112に準拠して密度勾配管を用いて温度23℃で測定した。密度はJIS K7112に準拠して密度勾配管を用いて温度23℃で測定した。
酸変性ポリオレフィン樹脂(B)について、射出成型法によりシリンダー温度:酸変性ポリオレフィン樹脂(B)の融点(Tm)+10℃で成型した試験片(12.5mm(幅)×120mm(長)×3mm(厚))を作製し、当該測定用試料について、ASTMD1525に準拠してA50法にてビカット軟化点を測定した。
樹脂組成物中の酸変性ポリオレフィン樹脂(B)の量(質量%)や、オレフィン重合体骨格の組成、酸基含有構造単位の量(質量%)は、13C-NMRにより測定した。測定条件は、下記のとおりである。
~条件~
測定装置:核磁気共鳴装置(ECP500型、日本電子(株)製)
観測核:13C(125MHz)
シーケンス:シングルパルスプロトンデカップリング
パルス幅:4.7μ秒(45°パルス)
繰り返し時間:5.5秒
積算回数:1万回以上
溶媒:オルトジクロロベンゼン/重水素化ベンゼン(容量比:80/20)混合溶媒
試料濃度:55mg/0.6mL
測定温度:120℃
ケミカルシフトの基準値:27.50ppm
半芳香族ポリアミド樹脂(A)((A-1)~(A-5))、および酸変性ポリオレフィン樹脂(B)((B-1)~(B-4))を、以下のようにして調製した。
1,6-ジアミノヘキサン1312g(11.3モル)、2-メチル-1,5-ジアミノペンタン1312g(11.3モル)、テレフタル酸3655g(22.0モル)、触媒として次亜リン酸ナトリウム5.5g(5.2×10-2モル)、及びイオン交換水640ml、を1リットルの反応器に仕込み、窒素置換後、250℃、35kg/cm2の条件で1時間反応させた。1,6-ジアミノヘキサンと2-メチル-1,5-ジアミノペンタンとのモル比は50:50とした。1時間経過後、この反応器内に生成した反応生成物を、この反応器と連結され、かつ圧力を約10kg/cm2低く設定した受器に抜き出し、極限粘度[η]が0.15dl/gであるポリアミド前駆体を得た。
次いで、このポリアミド前駆体を乾燥し、二軸押出機を用いてシリンダー設定温度330℃で溶融重合させて、半芳香族ポリアミド樹脂(A-1)を得た。この芳香族ポリアミド樹脂(A-1)の組成は次の通りである。
ジアミン成分単位中の1,6-ジアミノヘキサン成分単位含有率は50モル%;2-メチル-1,5-ジアミノペンタン成分単位含有率は、50モル%であった。得られたポリアミド樹脂の極限粘度[η]は1.0dl/g、融点Tmは300℃、ガラス転移温度は140℃であった。得られた結果を表1にまとめて示す。
テレフタル酸1787g(10.8モル)、1,6-ヘキサンジアミン2800g(24.1モル)、アジピン酸1921g(13.1モル)、次亜リン酸ナトリウム一水和物5.7g及び蒸留水554gを内容量13.6Lのオートクレーブに入れ、窒素置換した。190℃から攪拌を開始し、3時間かけて内部温度を250℃まで昇温させた。このとき、オートクレーブの内圧を3.01MPaまで昇圧させた。このまま1時間反応を続けた後、オートクレーブ下部に設置したスプレーノズルから大気放出して低縮合物を抜き出した。
その後、低縮合物を室温まで冷却し、粉砕機で1.5mm以下の粒径まで粉砕し、110℃で24時間乾燥させた。得られた低縮合物の水分量は3600ppm、極限粘度[η]は0.14dl/gであった。次に、この低縮合物を棚段式固相重合装置にいれ、窒素置換後、約1時間30分かけて220℃まで昇温させた。その後、1時間反応させて、室温まで降温させた。得られた化合物の極限粘度[η]は0.48dl/gであった。
その後、スクリュー径30mm、L/D=36の二軸押出機にて、バレル設定温度330℃、スクリュー回転数200rpm、6kg/hの樹脂供給速度で溶融重合して、半芳香族ポリアミド樹脂(A-2)を調製した。得られた半芳香族ポリアミド樹脂(A-2)の極限粘度[η]は1.0dl/g、融点Tmは310℃、ガラス転移温度は85℃であった。得られた結果を表1にまとめて示す。
1,6ージアミノヘキサン2800g(24.3モル)、テレフタル酸2774g(16.7モル)、イソフタル酸1196g(7.2モル)、安息香酸36.6g(0.3モル)、次亜リン酸ナトリウム一水和物5.7g及び蒸留水545gを内容量13.6Lのオートクレーブに入れ、窒素置換した。190℃から攪拌を開始し、3時間かけて内部温度を250℃まで昇温させた。このとき、オートクレーブの内圧を3.03MPaまで昇圧させた。このまま1時間反応を続けた後、オートクレーブ下部に設置したスプレーノズルから大気放出して低縮合物を抜き出した。その後、室温まで冷却後、低縮合物を粉砕機で1.5mm以下の粒径まで粉砕し、110℃で24時間乾燥させた。得られた低縮合物の水分量は4100ppm、極限粘度[η]は0.15dl/gであった。次に、この低縮合物を棚段式固相重合装置にいれ、窒素置換後、約1時間30分かけて180℃まで昇温した。その後、1時間30分反応し、室温まで降温させた。得られた化合物の極限粘度[η]は0.20dl/gであった。
その後、スクリュー径30mm、L/D=36の二軸押出機にて、バレル設定温度を330℃、スクリュー回転数200rpm、6Kg/hの樹脂供給速度で溶融重合して、半芳香族ポリアミド樹脂(A-3)を調製した。得られたポリアミド樹脂の極限粘度[η]は1.0dl/g、融点Tmは330℃、ガラス転移温度は125℃であった。得られた結果を表1にまとめて示す。
テレフタル酸4537.7g(27.3モル)、1,9-ノナンジアミンと2-メチル-1,8-オクタンジアミンとの混合物[1,9-ノナンジアミン/2-メチル-1,8-オクタンジアミン=80/20(モル比)]4385g(27.7モル)、次亜リン酸ナトリウム一水和物9.12g(原料の総質量に対して0.1質量%)および蒸留水2.5リットルを内容積20リットルのオートクレーブに入れ、窒素置換した。100℃で30分間攪拌し、2時間かけてオートクレーブ内部の温度を220℃に昇温させた。この時、オートクレーブ内部の圧力は2MPaまで昇圧させた。そのまま2時間反応を続けた後230℃に昇温し、その後2時間、230℃に温度を保ち、水蒸気を徐々に抜いて圧力を2MPaに保ちながら反応させた。次に、30分かけて圧力を1MPaまで下げ、さらに1時間反応させて、極限粘度[η]が0.15dl/gのプレポリマーを得た。これを、100℃、減圧下で12時間乾燥し、2mm以下の粒径まで粉砕した。これを230℃、13Pa(0.1mmHg)にて10時間固相重合し、半芳香族ポリアミド樹脂(A-4)を調製した。得られた半芳香族ポリアミド樹脂(A-4)の極限粘度[η]は1.2dl/g、融点Tmは300℃、ガラス転移温度は120℃であった。得られた結果を表1にまとめて示す。
1,6-ジアミノヘキサン1289g(11.1モル)、2-メチル-1,5-ジアミノペンタン1289g(11.0モル)、テレフタル酸3655g(22.0モル)、触媒として次亜リン酸ナトリウム5.5g(5.2×10-2モル)、及びイオン交換水640ml、を1リットルの反応器に仕込み、窒素置換後、250℃、35kg/cm2の条件で1時間反応させた。1,6-ジアミノヘキサンと2-メチル-1,5-ジアミノペンタンとのモル比は50:50とした。1時間経過後、この反応器内に生成した反応生成物を、この反応器と連結され、かつ圧力を約10kg/cm2低く設定した受器に抜き出し、極限粘度[η]が0.15dl/gであるポリアミド前駆体を得た。
次いで、このポリアミド前駆体を乾燥し、二軸押出機を用いてシリンダー設定温度330℃で溶融重合させて、半芳香族ポリアミド樹脂(A-5)を得た。この芳香族ポリアミド樹脂(A-5)の組成は次の通りである。
ジアミン成分単位中の1,6-ジアミノヘキサン成分単位含有率は50モル%;2-メチル-1,5-ジアミノペンタン成分単位含有率は、50モル%であった。得られたポリアミド樹脂の極限粘度[η]は1.0dl/g、融点Tmは300℃、ガラス転移温度は138℃であった。得られた結果を表1にまとめて示す。
高密度ポリエチレン[密度:0.95、MFR=5g/10min]100質量部、無水マレイン酸0.8質量部、および有機過酸化物[日本油脂(株)パーヘキシン-25B]0.07質量部、をヘンシェルミキサーで混合し、得られた混合物を230℃に設定した65mmφの一軸押出機で溶融グラフト変性することによって、グラフト変性ポリエチレンを得た。
このグラフト変性ポリエチレンの無水マレイン酸グラフト量は0.7質量%であった。得られた結果を表2にまとめて示す。
直鎖状低密度ポリエチレン[密度:0.92、MFR=4g/10min]100質量部、無水マレイン酸1.0質量部、および有機過酸化物[日本油脂(株)パーヘキシン-25B]0.07重量部、をヘンシェルミキサーで混合し、得られた混合物を230℃に設定した65mmφの一軸押出機で溶融グラフト変性することによって、グラフト変性ポリエチレンを得た。
このグラフト変性ポリエチレンの無水マレイン酸グラフト量は0.9質量%であった。得られた結果を表2にまとめて示す。
十分に窒素置換したガラス製フラスコに、ビス(1,3-ジメチルシクロペンタジエニル)ジルコニウムジクロリドを0.63mg入れ、更にメチルアミノキサンのトルエン溶液(Al;0.13ミリモル/リットル)1.57ml、およびトルエン2.43mlを添加することにより触媒溶液を得た。
次に、十分に窒素置換した内容積2リットルのステンレス製オートクレーブに、ヘキサン912ml、および1-ブテン320mlを導入し、系内の温度を80℃に昇温させた。引き続き、トリイソブチルアルミニウム0.9ミリモルおよび上記で調整した触媒溶液2.0ml(Zrとして0.0005ミリモル)をエチレンと共に系内に圧入し、重合反応を開始させた。エチレンを連続的に供給することにより全圧を8.0kg/cm2-Gに保ち、80℃で30分間重合を行った。
少量のエタノールを系中に導入して重合を停止させた後、未反応のエチレンをパージした。得られた溶液を大過剰のメタノール中に投入することにより白色固体を析出させた。この白色固体を濾過により回収し、減圧下で一晩乾燥させて、白色固体(エチレン・1-ブテン共重合体)を得た(密度=0.87g/cm3、MFR(ASTMD1238規格、190℃:2.16kg荷重)=0.7g/10分、1-ブテン構造単位含有率:4モル%)。得られたエチレン・1-ブテン共重合体100質量部に、無水マレイン酸1.0質量部と過酸化物(パーヘキシン(登録商標)25B、日本油脂(株)製)0.04質量部とを混合した。得られた混合物を230℃に設定した1軸押出機で溶融グラフト変性することによって酸変性エチレン・1-ブテン共重合体を得た。無水マレイン酸グラフト変性量は0.9質量%であった。得られた結果を表2にまとめて示す。
酸変性ポリオレフィン樹脂(B-3)の製造におけるコモノマーを1-オクテンに変更した以外は酸変性ポリオレフィン樹脂(B-3)と同様にして調製した。無水マレイン酸グラフト変性量は0.87質量%であった。得られた結果を表2にまとめて示す。
半芳香族ポリアミド樹脂(A-1)を64質量%、酸変性ポリオレフィン樹脂(B-2)を5質量%、耐熱老化剤を1質量%、タンブラーブレンダーを用いて混合し、二軸押出機((株)日本製鋼所製TEX30α)にて、シリンダー温度(半芳香族ポリアミド樹脂(A)の融点(Tm)+15)℃で原料を溶融混錬し、さらに、二軸押出機の任意の位置からガラス繊維(オーウェンスコーニング社製)を30質量%添加し、溶融混練した。その後、ストランド状に押出し、水槽で冷却した。その後、ペレタイザーでストランドを引き取り、カットすることでペレット状の本発明の樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったころ、半芳香族ポリアミド樹脂(A)由来のTgは、138℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。
半芳香族ポリアミド樹脂(A-1)を59質量%と、酸変性ポリオレフィン樹脂(B-2)を10質量%、ガラス繊維(オーウェンスコーニング社製)を30質量%、耐熱老化剤を1質量%、タンブラーブレンダーを用いて混合したこと以外は、実施例1と同様の方法により、実施例2のペレット状の本発明の樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったところ、半芳香族ポリアミド樹脂(A)由来のTgは、138℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。また当該樹脂組成物について、LFM測定を行った結果を図1に示した。
半芳香族ポリアミド樹脂(A-1)を49質量%と、酸変性ポリオレフィン樹脂(B-2)を20質量%、ガラス繊維(オーウェンスコーニング社製)を30質量%、耐熱老化剤を1質量%、タンブラーブレンダーを用いて混合したこと以外は、実施例1と同様の方法により、実施例3のペレット状の本発明の樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったところ、半芳香族ポリアミド樹脂(A)由来のTgは、139℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。
半芳香族ポリアミド樹脂(A-1)を59質量%と、酸変性ポリオレフィン樹脂(B-2)を7質量%、酸変性ポリオレフィン樹脂(B-3)を3質量%、ガラス繊維(オーウェンスコーニング社製)を30質量%、耐熱老化剤を1質量%、タンブラーブレンダーを用いて混合したこと以外は、実施例1と同様の方法により、実施例4のペレット状の本発明の樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったところ、半芳香族ポリアミド樹脂(A)由来のTgは、138℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。また当該樹脂組成物について、LFM測定を行った結果を図2に示した。
半芳香族ポリアミド樹脂(A-4)を59質量%と、酸変性ポリオレフィン樹脂(B-2)を10質量%、ガラス繊維(オーウェンスコーニング社製)を30質量%、耐熱老化剤を1質量%、タンブラーブレンダーを用いて混合したこと以外は、実施例1と同様の方法により、実施例5のペレット状の本発明の樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったところ、半芳香族ポリアミド樹脂(A)由来のTgは、119℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。
半芳香族ポリアミド樹脂(A-1)を69質量%と、ガラス繊維(オーウェンスコーニング社製)を30質量%、耐熱老化剤を1質量%、タンブラーブレンダーを用いて混合したこと以外は、実施例1と同様の方法により、比較例1のペレット状樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったところ、半芳香族ポリアミド樹脂(A)由来のTgは、139℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。
半芳香族ポリアミド樹脂(A-1)を44質量%と、酸変性ポリオレフィン樹脂(B-2)を25質量%、ガラス繊維(オーウェンスコーニング社製)を30質量%、耐熱老化剤を1質量%、タンブラーブレンダーを用いて混合したこと以外は、実施例1と同様の方法により、比較例2のペレット状樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったところ、半芳香族ポリアミド樹脂(A)由来のTgは、136℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。
半芳香族ポリアミド樹脂(A-1)を(A-2)に変えたこと以外は、実施例2と同様の方法により、比較例3のペレット状樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったところ、半芳香族ポリアミド樹脂(A)由来のTgは、85℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。
半芳香族ポリアミド樹脂(A-1)を(A-3)に変えたこと以外は、実施例2と同様の方法により、実施例6のペレット状樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったところ、半芳香族ポリアミド樹脂(A)由来のTgは、125℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。
酸変性ポリオレフィン樹脂(B-2)を(B-1)に変えたこと以外は、実施例2と同様の方法により、比較例4のペレット状樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったところ、半芳香族ポリアミド樹脂(A)由来のTgは、139℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。
酸変性ポリオレフィン樹脂(B-2)を(B-3)に変えたこと以外は、実施例2と同様の方法により、比較例5のペレット状樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったところ、半芳香族ポリアミド樹脂(A)由来のTgは、Tgは138℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。また当該樹脂組成物について、LFM測定を行った結果を図3に示した。
酸変性ポリオレフィン樹脂(B-2)を(B-4)に変えたこと以外は、実施例2と同様の方法により、比較例6のペレット状樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったところ、半芳香族ポリアミド樹脂(A)由来のTgは、Tgは138℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。
半芳香族ポリアミド樹脂(A-5)を64質量%と、酸変性ポリオレフィン樹脂(B-2)を5質量%、ガラス繊維(オーウェンスコーニング社製)を30質量%、耐熱老化剤を1質量%、タンブラーブレンダーを用いて混合したこと以外は、実施例1と同様の方法により、実施例7のペレット状樹脂組成物を得た。得られたペレットについて、前述の半芳香族ポリアミド樹脂(A)と同様にDSCにて測定を行ったところ、半芳香族ポリアミド樹脂(A)由来のTgは、138℃であった。得られたペレット状樹脂組成物について、後述のように試験を行った。得られた結果を表3にまとめて示す。
実施例及び比較例で得られたペレット状樹脂組成物を、それぞれ以下の方法で評価した。
上記の方法で調整した各樹脂組成物を下記の射出成型機を用い、下記の成型条件で調整した厚さ3mmのASTM-1(ダンベル片)の試験片を、温度23℃、窒素雰囲気下で24時間放置した。次いで、温度23℃、相対湿度50%の雰囲気下で引張試験を行い、引っ張り強度を測定した。
成型機:(株)ソディック プラスティック、ツパールTR40S3A
成型機シリンダー温度:半芳香族ポリアミド樹脂(A)の融点(Tm)+15℃、金型温度:半芳香族ポリアミド樹脂(A)のTg+20℃
下記の射出成型機を用い、下記の成型条件で調整した厚さ3.2mmの試験片を、温度23℃、窒素雰囲気下で24時間放置した。次いで、温度23℃、相対湿度50%の雰囲気下で曲げ試験機:NTESCO社製 AB5、スパン51mm、曲げ速度12.7mm/分で曲げ試験を行い、曲げ強度、弾性率を測定した。
成型機:(株)ソディック プラスティック、ツパールTR40S3A
成型機シリンダー温度:半芳香族ポリアミド樹脂(A)の融点(Tm)+15℃、金型温度:160℃
下記の射出成型機を用い、下記の成型条件で調整したノッチ付き、厚さ:3.2mmの試験片を作成して、ASTMD256に準拠して、温度23℃、相対湿度50%の雰囲気下および温度-40℃、相対湿度50%の雰囲気でのIZOD衝撃強度で測定した。
成型機:住友重機械工業(株)社製、SE50DU
成型機シリンダー温度:半芳香族ポリアミド樹脂(A)の融点(Tm)+15℃、金型温度:半芳香族ポリアミド樹脂(A)のTg+20℃
具体的な測定条件は、次の通りである。
機種:環境制御型プローブ顕微鏡NanoNavi/E-sweep(株式会社日立ハイテクサイエンス)
カンチレバー:OMCL-RC800PB
(バネ定数)=0.11N/m(オリンパス株式会社)
測定環境:高真空下(1.0×10-4 Pa以下)
測定時荷重;4nN
昇温速度;3℃/min
測定温度範囲:10℃~121℃
(1)LFM用サンプルの調整方法
下記の射出成型機を用い、各樹脂組成物の下記の条件で試験片を作製した。各試験片は、長さ:90mm、幅:48mm、厚さ:3mmとし、その試験片から長さ:10mm、幅:10mm、厚さ:3mmの試験片を切り出し、LFMの試験片とした。
成型機:住友重機械工業(株)社製、SG50
成型機シリンダー温度:半芳香族ポリアミド樹脂(A)の融点(Tm)+15℃、金型温度:半芳香族ポリアミド樹脂(A)のTg+20℃
(2)高真空条件下(1.0×10-4Pa以下)、上記サンプルを用いて、水平力顕微鏡(株式会社日立ハイテクサイエンス製 環境制御型プローブ顕微鏡NanoNavi/E-sweep)のプローブであるカンチレバー(バネ定数0.1N/m)の探針を4nNの荷重で押しつけながら、膜面に対し平行で、かつカンチレバーの方向に対し垂直方向に、振幅1μmを周期0.5Hzで往復させたときのカンチレバーの捻れ量から計算される値(水平力)を、温度10℃~121℃の範囲において、1℃毎に計測した。
(3)前記(2)で得られた摩擦力を温度に対してプロットした。
(4)前記(3)のプロットを観察し、23℃における摩擦力T(23)と90℃における摩擦力T(90)の比(T(23)/T(90))を硬度変化の指標として求めた。
各半芳香族ポリアミド樹脂(A)1gをフェノール35mLに溶解させ、メタノールを2mL混合し、試料溶液とした。そして、チモールブルーを指示薬として、当該試料溶液に対して0.01規定のHCl水溶液を使用した滴定を実施し、末端アミノ基量([NH2]、単位:mmol/kg)を特定した。そして、当該末端アミノ基量と、各樹脂組成物に含まれる半芳香族ポリアミド樹脂(A)の質量との積から、樹脂組成物に含まれる末端アミノ基の量(モル)を求めた。
酸変性ポリオレフィン樹脂(B)のペレット5gをトルエン170mLに溶解し、さらにエタノールを30mL加えて調製した試料溶液を用いて、フェノールフタレインを指示薬とし、0.1規定のKOHエタノール溶液を使用した滴定を実施し、酸変性ポリオレフィン樹脂(B)の酸基及びその誘導体基の総量(単位:mmol/kg)を特定した。そして、当該酸基及びその誘導体基の総量と、各樹脂組成物に含まれる酸変性ポリオレフィン樹脂(B)の質量との積から、樹脂組成物に含まれる酸変性ポリオレフィン樹脂(B)の酸基及びその誘導体基の総量(モル)を求めた。
下記の射出成型機を用い、各樹脂組成物の下記の条件で試験片を作製した。各試験片は、長さ:90mm、幅:48mm、厚さ:3mmとし、その試験片から長さ:10mm、幅:10mm、厚さ:3mmの試験片を切り出して、体積固有抵抗評価用の試験片とした。
成型機:住友重機械工業(株)社製、SG50
成型機シリンダー温度:半芳香族ポリアミド樹脂(A)の融点(Tm)+15℃、金型温度:半芳香族ポリアミド樹脂(A)のTg+20℃
作製した試験片を用い、株式会社エーディーシー社製の機種8340Aを用いて固有抵抗率をASTM D257:2007の二重リング電極法に準じて求めた。
下記の射出成型機を用い、各樹脂組成物の下記の条件で試験片を作製した。試験片は中央部に、樹脂同士の接合部(ウェルド部)を有する厚さ3.2mmの形状とした。
成型機:射出成型機ツパールTR40S3A((株)ソディック プラスティック社製)
成型機シリンダー温度:半芳香族ポリアミド樹脂(A)の融点(Tm)+15℃
金型温度:半芳香族ポリアミド樹脂(A)のTg+20℃
当該試験片を130℃に調整したATFオイル中に5分間放置し、続いて、-40℃に冷却したATFオイル中に5分間放置するという試験を100回繰り返した。その後、試験片の接合部強度を引張試験により測定した。そして、試験前後における、強度維持率(%)を求めた。
強度維持率(%)=(試験後の引張強度/初期の引張強度)×100
Claims (14)
- ジカルボン酸成分単位及び脂肪族系ジアミン成分単位から構成される半芳香族ポリアミド樹脂(A)と、
酸変性ポリオレフィン樹脂(B)と、
繊維状充填剤(C)と、
を含む半芳香族ポリアミド樹脂組成物であって、
前記半芳香族ポリアミド樹脂(A)は、前記ジカルボン酸成分単位の総モル数に対して、テレフタル酸成分単位を60モル%以上含み、
前記半芳香族ポリアミド樹脂(A)と、前記酸変性ポリオレフィン樹脂(B)と、前記繊維状充填剤(C)との合計100質量部に対し、前記酸変性ポリオレフィン樹脂(B)を1.0~23質量部含み、
前記半芳香族ポリアミド樹脂組成物は、下記要件(1)を満たし、
前記酸変性ポリオレフィン樹脂(B)は、下記要件(2)を満たす、半芳香族ポリアミド樹脂組成物。
(1)DSCにより測定される半芳香族ポリアミド樹脂(A)由来のガラス転移温度が90℃~180℃の範囲にある
(2)ASTM D1525に準拠して測定されるビカット軟化点が45℃~110℃の範囲にある - 水平力顕微鏡(LFM)を用いて測定した23℃における摩擦力T(23)と90℃における摩擦力T(90)との比(T(90)/T(23))が5以下である、請求項1に記載の半芳香族ポリアミド樹脂組成物。
- 前記酸変性ポリオレフィン樹脂(B)は、オレフィン重合体を不飽和カルボン酸またはその誘導体で変性した樹脂であり、
前記半芳香族ポリアミド樹脂組成物が含む、前記半芳香族ポリアミド樹脂(A)の末端アミノ基の総モル数(MA)と、前記酸変性ポリオレフィン樹脂(B)の酸基及びその誘導体基の総モル数(MB)とが、下記要件(3)を満たす、請求項1に記載の半芳香族ポリアミド樹脂組成物。
(3)MA-MB≧3.0 - 前記酸変性ポリオレフィン樹脂(B)のASTM D1525に準拠して測定されるビカット軟化点が、90℃~110℃の範囲にある、請求項1に記載の半芳香族ポリアミド樹脂組成物。
- 前記半芳香族ポリアミド樹脂(A)の前記脂肪族系ジアミン成分単位は、下記の要件(a1)及び要件(a2)のうち、少なくとも一方を満たす、請求項1に記載の半芳香族ポリアミド樹脂組成物。
(a1)炭素原子数4~18の直鎖アルキレンジアミン成分単位を、前記脂肪族ジアミン成分単位の総モル数に対して40~90モル%含む
(a2)炭素原子数4~18の側鎖アルキレンジアミン成分単位を、前記脂肪族ジアミン成分単位の総モル数に対して10~60モル%含む - 前記側鎖アルキレンジアミン成分単位が、2-メチル-1,8-オクタンジアミン成分単位及び2-メチル-1,5-ペンタジアミン成分単位のうち、少なくとも一方を含む、請求項5に記載の半芳香族ポリアミド樹脂組成物。
- 前記直鎖アルキレンジアミン成分単位が、1,6-ジアミノヘキサン成分単位を含み、
前記側鎖アルキレンジアミン成分単位が、2-メチル-1,5-ペンタジアミン成分単位を含む、請求項5に記載の半芳香族ポリアミド樹脂組成物。 - 前記脂肪族ジアミン成分単位が、1,6-ジアミノヘキサン成分単位を45モル%超55モル%未満、2-メチル-1,5-ペンタジアミン成分単位を45モル%超55モル%未満含む、請求項7に記載の半芳香族ポリアミド樹脂組成物。
- 前記直鎖アルキレンジアミン成分単位が、1,9-ノナンジアミン成分単位を含み、前記側鎖アルキレンジアミン成分単位が、2-メチル-1,8-オクタンジアミン成分単位を含む、請求項5に記載の半芳香族ポリアミド樹脂組成物。
- 前記半芳香族ポリアミド樹脂(A)の前記ジカルボン酸成分単位が、イソフタル酸成分単位をさらに含み、
前記半芳香族ポリアミド樹脂(A)の前記脂肪族系ジアミン成分単位の炭素原子数が4~15である、請求項1に記載の半芳香族ポリアミド樹脂組成物。 - 前記半芳香族ポリアミド樹脂(A)の前記ジカルボン酸成分単位が、イソフタル酸成分単位をさらに含み、かつ前記テレフタル酸成分単位と、前記イソフタル酸成分単位とのモル比が、60/40~99.9/0.1であり、かつ
前記脂肪族ジアミン成分単位が、1,6-ジアミノヘキサン成分単位を45モル%超55モル%未満、2-メチル-1,5-ペンタジアミン成分単位を45モル%超55モル%未満含む、請求項10に記載の半芳香族ポリアミド樹脂組成物。 - 前記酸変性ポリオレフィン樹脂(B)が下記要件(4)及び(5)を満たす、請求項3に記載の半芳香族ポリアミド樹脂組成物。
(4)前記不飽和カルボン酸またはその誘導体のグラフト量が0.01~1.5質量%である
(5)JIS K7112に準拠して測定される密度が890~940kg/m3の範囲にある - 前記半芳香族ポリアミド樹脂(A)を30~90質量%、
前記酸変性ポリオレフィン樹脂(B)を1~20質量%、
前記繊維状充填剤(C)を5~60質量%、含む(ただし、前記半芳香族ポリアミド樹脂(A)、前記酸変性ポリオレフィン樹脂(B)、及び前記繊維状充填剤(C)の合計は100質量%である)、請求項1~12のいずれか一項に記載の半芳香族ポリアミド樹脂組成物。 - 請求項1~12のいずれか一項に記載の半芳香族ポリアミド樹脂組成物を含む成型品。
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