JPH0372564A - Polyamide resin composition for engine head cover - Google Patents

Abstract

PURPOSE:To improve the tensile strength, flexural strength, heat resistance, water absorption resistance and deformation resistance by mixing a specific aromatic polyamide, a linear polyamide and an inorganic fiber. CONSTITUTION:5-200 pts.wt. inorganic fiber (e.g. glass fiber) having a diameter of 5-15mum and a length of 1-10mm is mixed with a total of 100 pts.wt. made up of 70-30 pts.wt. aromatic polyamide which comprises 30-100mol% terephthalic acid component units, 0-40mol% aromatic dicarboxylic acid component units other than the former and/or 100mol% aliphatic dicarboxylic acid component units and aliphatic and/or alicyclic alkylenediamine component units and has an intrinsic viscosity of 0.5-3.0dl/g and 30-70 pts.wt. linear polyamide (e.g. a polyhexamethyleneadipamide) having amide linkages of the formula and a relative viscosity of 3.4-10.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a polyamide resin composition for engine head covers, and more specifically, it has excellent tensile strength, bending strength, heat resistance, and water absorption resistance, as well as low warpage and deformation resistance. The present invention relates to a polyamide resin composition for an engine head cover that can provide an excellent engine head cover.

TECHNICAL BACKGROUND OF THE INVENTION In recent years, there has been a significant increase in the use of plastic parts for parts in automobile engine compartments from the viewpoints of weight reduction, rust prevention, and design freedom. Parts in automobile engine rooms are required to have excellent mechanical strength and heat resistance, so glass fiber reinforced products of polycapramide (nylon 6) and polyhexamethylene adipamide (nylon 66) have traditionally been used in automobiles. It has been used as a part in the engine room.

However, glass fiber-reinforced products such as those described above do not necessarily have satisfactory performance as parts in automobile engine compartments, for example, they do not have sufficient water resistance, resulting in dimensional changes and changes in physical properties due to water absorption. There was a problem in that the product warped after injection molding was large and did not have sufficient deformation resistance. In particular, the engine head cover has a wide planar area and requires sealing performance in the box, so warping (deformation) becomes a big problem.

By the way, Japanese Patent Laid-Open No. 62-57458 discloses a polyamide composition that has better mechanical strength and heat resistance than conventional polycapramide (nylon 6) or polyhexamethylene adipamide (nylon 66) glass fiber reinforced products. discloses a polyamide composition comprising a specific aromatic polyamide, a specific polyamide, and a filler.

However, even with such a polyamide composition, the deformation resistance is not necessarily sufficient as a composition for an engine head cover.

Therefore, the present inventors conducted extensive research to solve the above problems, and developed an aromatic polyamide consisting of a dicarboxylic acid component unit containing a specific aromatic dicarboxylic acid component unit and a specific alkylene diamine component unit. and a high molecular weight linear polyamide having a specific relative viscosity [η, ],
When injection molded using a polyamide resin composition blended with inorganic fibers in a specific ratio, injection molded products are obtained that have excellent tensile strength, bending strength, heat resistance, and water resistance, as well as small warpage and excellent deformation resistance. This discovery led to the completion of the present invention.

Purpose of the Invention The present invention seeks to solve the problems associated with the prior art as described above, and provides an engine head cover that has excellent tensile strength, bending strength, heat resistance, water resistance, and deformation resistance. The object of the present invention is to provide a polyamide resin composition for an engine head cover that provides the following.

Summary of the Invention The polyamide resin composition for engine head covers according to the present invention comprises 30 to 100 mol% of terephthalic acid component units, 0 to 40 mol% of aromatic dicarboxylic acid component units other than terephthalic acid component units, and/or aliphatic dicarboxylic acid components. Aromatic dicarboxylic acid component unit (a) consisting of 0 to 70 mol% of component units (however, the total of dicarboxylic acid component units is 100 mol%), aliphatic alkylene diamine component unit and/or alicyclic component unit Aromatic polyamide (A) consisting of alkylene diamine component unit (b); 70-
30 parts by weight, linear polyamide (B) having an amide bond represented by the general formula -CH-CONH-CH2- and having a relative viscosity [η] of 3.4 or more; 30 to 70 parts by weight (but , the total weight of component (A) and component (B) is 100
Inorganic fiber (C): 5 to 2 parts by weight per 100 parts by weight of the total weight of aromatic polyamide (A) and linear polyamide (B)
00 parts by weight.

DETAILED DESCRIPTION OF THE INVENTION The polyamide resin composition for engine head covers according to the present invention will be specifically described below.

The polyamide resin composition for engine head covers according to the present invention comprises aromatic polyamide (A) and linear polyamide (
B) and an inorganic fiber (C).

Aromatic polyamide (A) The aromatic polyamide (A) used in the present invention comprises an aromatic dicarboxylic acid component unit (a) whose main component unit is a terephthalic acid component unit, and an alkylene diamine component unit (b).
It is composed of.

This aromatic polyamide (A) usually has an intrinsic viscosity [η] of 0.5 to 3.0 when measured in concentrated sulfuric acid at a temperature of 30°C. Odj
/g, preferably in the range of 0.8 to 1.5 dl/g.

The aromatic dicarboxylic acid component unit (a) as described above includes
In addition to the terephthalic acid component unit, other aromatic dicarboxylic acid component units and/or aliphatic dicarboxylic acid component units may be included.

Specific examples of such other aromatic dicarboxylic acid component units include component units derived from isophthalic acid, phthalic acid, 2-methylterephthalic acid, naphthalene dicarboxylic acid, etc. Among these, isophthalic acid A component unit or a naphthalene dicarboxylic acid component unit is preferred, and an isophthalic acid component unit is particularly preferred.

The aromatic dicarboxylic acid component units include the above-mentioned terephthalic acid component units, other aromatic dicarboxylic acid component units and/or aliphatic dicarboxylic acid component units, and small amounts of trimellitic acid and pyromellitic acid. It may contain component units derived from tribasic or higher polyhydric carboxylic acids such as.

The aromatic dicarboxylic acid component unit (a) constituting the above aromatic polyamide (A) includes a total of 1 dicarboxylic acid component unit
In 00 moles, the number of terephthalic acid component units is usually 30 to 1.
Aromatic dicarboxylic acid component units other than terephthalic acid component units are normally contained in an amount of 0 to 40 mol%. The aliphatic dicarboxylic acid component unit is used together with the aromatic dicarboxylic acid component unit other than the terephthalic acid component unit, or in place of the aromatic dicarboxylic acid component unit other than the terephthalic acid component unit, usually in an amount of 0 to 70 mol%. include.

The aromatic polyamide (A) used in the present invention is composed of the aromatic dicarboxylic acid component unit (a) as described above, and an aliphatic alkylene diamine component unit and/or an alicyclic alkylene diamine component unit (b). be done. Among these aliphatic alkylene diamine component units, linear or branched chain alkylene diamine component units having 4 to 25 carbon atoms are preferred, and linear or branched alkylene diamine component units having 6 to 18 carbon atoms are more preferred. A linear alkylene diamine component unit having branches is desirable.

Specifically, such aliphatic diamine component units include, for example, 1. 6-diaminohexane 1. 7-Diaminohebutane 1. 8-diaminooctane 1. 9-diaminononane, l,10-diaminodecane 1.
Component units derived from linear alkylene diamines such as 11-diaminoundecane 1 and +2-diaminododecane; and 1,4-diamino-1,1-dimethylbutane, 1.4-
Diamino-1-ethylbutane, 1,4-diamino-1,
2-dimethylbutane, 1,4-diamino-1,3-dimethylbutane 1,4-diamino-1,4-dimethylbutane 1,4-diamino-2,3-dimethylbutane 1,2-diamino-1-butylethane , 6-diamino-2,5-dimethylhexane 1,6-diamino-2,4-dimethylhexane, 1,6-diamino-
3,3-dimethylhexane, 1,G-diamino-2,2
-dimethylhexane 1,6-diamino-2,2,4-trimethylhexane 1,6-diamino-2,4,4-)riftylhexane 1,7-diamino-2,3-dimethylhexane 1,7- Diamino-2,4-dimethylhebutane 1
．． 7-Diamino-2,5-dimethylhebutane 1,7-diamino-2,2-dimethylhebutane 1,8-diamino-
1,3-dimethyloctane 1,8-diamino-1,4-
Dimethyloctane 1.8-Diamino-2,4-dimethyloctane 1.8-Diamino-3,4-dimethyloctane 1.8-Diamino-4,5-dimethyloctane 1.8-
Diamino-2,2-dimethyloctane, 1,8-diamino-3,3-dimethyloctane, 1,8-diamino-4
, 4-dimethyloctane, 1,6-diamino-2,4-
Examples include component units derived from branched chain alkylene diamines such as diethylhexane and 1,9-diamino-5-methylnonane.

Among such straight chain or branched chain alkylene diamine component units, straight chain alkylene diamine component units are preferable, particularly 1,6-diaminohexane, 1,8-diaminooctane, 110- Component units derived from one or more compounds of linear alkylene diamines such as diaminodecane and 1,12-diaminododecane are preferred, and more preferably,
1.10-diaminodecane component units are preferred.

The alicyclic diamine component unit usually has 6 to 2 carbon atoms.
5 and is a component unit derived from a diamine containing at least one alicyclic hydrocarbon ring.

Specific examples of such fatty acid diamine component units include 13-diaminocyclohexane, 1.4-diaminocyclohexane, 1.3-bis(aminomethyl)cyclohexane, and 1.4-diaminocyclohexane.
-Bis(aminomethyl)cyclohexane, isophoronediamine, piperazine, 2,5-dimethylpiperazine, bis(4-aminocyclohexyl)methane, bis(4-
aminocyclohexyl)propane, 4,4'-diamino-3,3'-dimethyldicyclohexylpropane, 44'-diamino-3,3'-dimethyldicyclohexylmethane, 4,4'-diamino-3,3'-dimethyl-5 ,5'-
Dimethyldicyclohexylmethane, 4,4゛-diamino-3,3゛-dimethyl-5,5゛-
Dimethyldicyclohexylpropane, α-α′-bis(4-aminocyclohexyl)-p-diisopropylbenzene, α-α′-bis(4-aminocyclohexyl)1-diisopropylbenzene, α-α′-bis(4-aminocyclohexyl) )−,1,
4-cyclohexane, α-α′-bis(4-aminocyclohexyl)-1,3
- Component units derived from alicyclic diamines such as cyclohexane can be mentioned.

Among these alicyclic diamine component units, bis(aminomethyl)cyclohexane, bis(4-aminocyclohexyl)methane, and 4,4'-diamino-3,3'-dimethyldicyclohexylmethane are preferred, particularly bis(
Preferred are component units derived from alicyclic diamines such as 4-aminocyclohexyl)methane, 1.3-bis(aminocyclohexyl)methane, and 1.3-bis(aminomethyl)cyclohexane.

The aromatic polyamide (A) as described above can be produced by various conventionally known methods.

For example, a solution method in which aromatic dicarboxylic acid is made into a halide and polycondensed with a straight-chain aliphatic alkylene diamine in a homogeneous solution, and a halide of aromatic dicarboxylic acid dissolved in a polar solvent and a straight-chain fat dissolved in a non-polar solvent. The aromatic polyamide (A) can be produced by an interfacial method in which condensation with a group alkylene diamine is performed at the interface. Further, the aromatic polyamide (A) as described above can also be produced by a melt polymerization method or a solid phase polymerization method.

In the present invention, the aromatic polyamide (A) is used in an amount of 70 to 30 parts by weight, preferably 60 to 40 parts by weight, based on 100 parts by weight of the total weight of the aromatic polyamide (A) and the linear polyamide (B). used in

Linear polyamide (B) The linear polyamide (B) used in the present invention has the general formula -
It is a high molecular weight polyamide having an amide bond represented by CH-CONH-CH2- and a relative viscosity [η] of 3.4 or more.

Specifically, polyamides having an amide bond represented by the general formula -CH2-C0NH-CH2- include polytetramethylene adipamide, polyhexamethylene adipamide, polyhexamethylene speramide, polyhexamethylene Cepacamide, hexamethylene diamine and 1.10-
Polyamide, polycapramide, with decanedicarboxylic acid
Examples include polyundecaneamide, polydodecanamide, polymethaxylylene adipamide, and the like. Among these linear polyamides (B), polyhexamethylene adipamide and polycabramide are preferably used.

In the present invention, among the above-mentioned linear polyamides, the relative viscosity [η] measured by the following method is 33
．． 4 or more, preferably 3.4 to 10, more preferably 3
．． A linear polyamide with a high molecular weight in the range of 6 to 6.5 is used.

The above relative viscosity [η] is 9 according to JIS K 6810, assuming a polymer concentration of 1 g / 100 ml.
It is determined by measuring 6% sulfuric acid at 25°C.

In the present invention, the linear polyamide (B) is 70 to 30 parts by weight, preferably 4 parts by weight, based on 100 parts by weight of the total weight of the aromatic polyamide (A) and the linear polyamide (B).
It is used in an amount of 0 to 60 parts by weight.

When the high molecular weight linear polyamide (B) as described above is used in an amount within the above range, the deformation resistance of the molded article obtained from the polyamide composition is improved.

Inorganic fiber (C) Specifically, the inorganic fiber (C) used in the present invention includes fibrous inorganic compounds such as glass fiber, carbon fiber, boron fiber, ceramic fiber, asbestos fiber, and stainless steel fiber. Can be mentioned.

Among these inorganic fibers (C), glass fibers are preferably used.

These inorganic fibers can also be used in combination of two or more. Moreover, these inorganic fibers can also be used after being treated with a silane coupling agent or a titanium coupling agent.

The inorganic fiber (C) used in the present invention has a diameter of 5 to 15 μm.
m1 is preferably from 6 to 13 μm, and the length is preferably from 2 to 10 m1, particularly preferably from 3 to 6+ms.

In the present invention, the inorganic fiber (C) has a total weight of 100% of the aromatic polyamide (A) and the linear polyamide (B).
5 to 200 parts by weight, preferably 5 to 15 parts by weight
It is used in an amount of 0 parts by weight, more preferably 10 to 100 parts by weight.

When such an inorganic fiber (C) is used in an amount within the above range, the mechanical properties such as tensile strength, bending strength, and flexural modulus, and heat resistance properties such as heat distortion temperature of the molded article obtained from the polyamide resin composition are improved. , physical and chemical properties such as water resistance are improved, and deformation resistance is improved.

The polyamide resin composition for an engine head cover according to the present invention has aromatic polyamide (A), linear polyamide (B), and inorganic fiber (C) as essential components as described above. In addition, inorganic fillers, antioxidants, ultraviolet absorbers, photoprotectants, heat stabilizers, phosphite stabilizers, peroxide decomposers, basic adjuvants,
Nucleating agents, plasticizers, lubricants, antistatic agents, flame retardants, pigments,
It may also contain a dye or the like.

Examples of the above-mentioned inorganic fillers include various fillers having powder, granule, plate, strand, cross, and mat shapes, and specifically, silica, alumina, silica alumina, and talc. , diatomaceous earth, clay, kaolin, quartz, glass, mica, graphite, molybdenum disulfide, ceracola, red iron oxide, titanium dioxide, zinc oxide, aluminum, copper, stainless steel, and other powder-like and plate-like inorganic compounds. .

These inorganic fillers can also be used in combination of two or more. Further, these inorganic fillers can be used after being treated with a silane coupling agent, a titanium coupling agent, or the like.

Among the inorganic fillers, powdered inorganic fillers include:
Specifically, mention may be made of silica, silica alumina, alumina, titanium dioxide, graphite, molybdenum disulfide, polytetrafluoroethylene, etc. In particular, the use of graphite, molybdenum disulfide or polytetrafluoroethylene may be used in accordance with the present invention. This is preferable because the wear resistance such as the dynamic friction coefficient, taper wear, and limit Pv value of the molded article obtained from the polyamide resin composition is improved.

The average particle size of such a powdered inorganic filler is usually 0.
．． 1 mμ to 200 μm, preferably 1 mμ to 100 μm
It is desirable that it be within the range of .

It is preferable that the average particle size is within this range because the wear resistance of the polyamide resin composition is significantly improved.

Such a powdered inorganic filler is made of aromatic polyamide (
The amount is usually 200 parts by weight or less, preferably 150 parts by weight or less, particularly preferably 10 to 10 parts by weight, based on 100 parts by weight of the total weight of A) and linear polyamide (B).
Preferably, it is included in an amount of 0 parts by weight.

The polyamide resin composition for an engine head cover according to the present invention can be prepared by a method such as blending a filler while maintaining each component of the polyamide resin composition in a molten state. At this time, an extruder, kneader, etc. can be used.

The polyamide resin composition for an engine head cover according to the present invention as described above can be molded by a conventional melt molding method, such as a compression molding method, an injection molding method, or an extrusion molding method.

Effects of the Invention The polyamide resin composition for an engine head cover according to the present invention comprises an aromatic polyamide (A) comprising an aromatic dicarboxylic acid component unit (a) containing a terephthalic acid component unit and a specific alkylene diamine component unit (b). Since the composition contains a high molecular weight linear polyamide (-B) having a specific relative viscosity [η] and inorganic fibers (C) in a specific proportion, the composition has good fluidity during molding. If you use tensile strength, bending strength,
An engine head cover that has excellent heat resistance, water resistance, and deformation resistance can be obtained. Moreover, the polyamide resin composition according to the present invention can be used to improve warpage of products other than engine head covers that are box-shaped and have many flat parts.

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to these Examples.

Example 1 [Synthesis of aromatic polyamide] 254 g of 1,6-diaminohexane (2,19M),
247 g (1,49 M) of terephthalic acid, 106 g (0,64 M) of isophthalic acid, 0.45 g (4,25 x lO'M) of sodium hypophosphite as a catalyst, and 148 ml of ion-exchanged water were prepared in 1. The mixture was charged into a reactor containing 100% nitrogen, and after purging with nitrogen, the reaction was carried out at 250° C. and 35 kg/al for 1 hour. After the reaction is completed, the reactor is extracted into a receiver whose pressure is set approximately 10 kg/d lower than that of the reactor, and the intrinsic viscosity [η] is 0. 10
545 g of polyamide di/g (concentrated sulfuric acid, 30°C)
I got it.

Next, after drying this polyamide, it is melt-polymerized using a two-wheeled extruder at a cylinder temperature of 330°C until the intrinsic viscosity [η] is 1. ld//g (concentrated sulfuric acid, 30°C) of aromatic polyamide was obtained.

The mole % of terephthalic acid component units in this aromatic polyamide was 71%, and the melting point was 320°C.

[Manufacture of polyamide resin composition] 60 parts by weight of the above aromatic polyamide and relative viscosity [η
] 6.0 polycapramide [manufactured by Unitika, nylon 6
After tri-blending A 11150140 parts by weight in a tumbler, glass fibers with a diameter of 13 μm [manufactured by Nitto Boseki ■, product number C5-6PA-] were prepared using a vented twin-screw extruder [■ Ikegai Steel Co., Ltd., model number PCM-45]. 4733] was supplied from the vent section and granulated at 320°C.

The pellets of the polyamide resin composition thus obtained were molded using an injection molding machine [manufactured by Toshiba Machine, 15-50].
A test piece was injection molded under the following conditions.

[Injection molding conditions] Cylinder temperature (℃): 290/300/300/300 Injection pressure (kg/a1): Primary/secondary temperature 1000/800 Whole mold temperature (Tl:): 50 Regarding the above test piece, tensile Properties, bending properties, heat resistance, water resistance and deformation resistance were evaluated according to the following methods.

[Evaluation method] (1) Tensile properties Using an ASTM type ■ test piece according to ASTM 0638, a tensile test is conducted at a tensile speed of 20 min/min to determine the tensile strength.

(2) Bending properties Size 3.2w x 12.7 according to ASTM 0790
■A bending test is performed using a 127 mm test piece to determine bending strength and bending elastic modulus.

(3) Heat resistance Evaluation of heat resistance is performed at heat distortion temperature.

The heat distortion temperature is 18.
Size 6.4mX1 with 6kg/- bending stress applied
A test piece measuring 2.7 m x 127+ m is heated at a rate of 2° C. per minute, and the temperature is set at the time when the amount of deflection reaches 0.254 mm.

(4) Water resistance Water resistance is evaluated based on water absorption rate.

The water absorption rate is 3.2 in accordance with ASTM-D-570.
- The test piece is left in water at 23° C. for 24 hours and the water content is measured.

(5) Deformation resistance Deformation resistance is evaluated based on the degree of warpage.

The degree of warpage is expressed by measuring the maximum height between the flat plate and the test piece by touching two points of a 2 m x 130 mm x 120 mm test piece on a flat plate.

The evaluation results are shown in Table 1.

Example 2 The procedure was carried out in the same manner as in Example 1, except that polyhexamethylene adipamide (manufactured by Ube Industries, Ltd., nylon 6621126B) having a relative viscosity [η] of 3.6 was used instead of polycabramide. A polyamide resin composition and a test piece were obtained, and the above-mentioned physical properties of the obtained test piece were evaluated.

The evaluation results are shown in Table 1.

Comparative Example 1 In Example 1, the blending amount of aromatic polyamide was 40 parts by weight, and instead of 40 parts by weight of polycapramide in Example 1, polycabramide with a relative viscosity [η] of 2.1 [manufactured by Unitika, nylon 6A102011RL] 60 A polyamide resin composition and a test piece were obtained in the same manner as in Example 1 except that parts by weight were used, and the above-mentioned physical properties of the obtained test piece were evaluated.

The evaluation results are shown in Table 1.

Table 1 Example 3 In Example 1, polycapramide [manufactured by Unitika, nylon 6, Al0] with a relative viscosity [η] of 6.0 was used.
A polyamide resin composition and a test piece were obtained in the same manner as in Example 1, except that polycabramide with a relative viscosity [η] of 4.2 [Nylon 6 A 10451 manufactured by Unitika] was used instead of [50]. The above physical properties of the test pieces were evaluated.

The evaluation results are shown in Table 2.

Example 4 A polyamide resin composition and a test piece were obtained in the same manner as in Example 1, except that the amounts of aromatic polyamide and polycapramide were changed to 40 parts by weight and 60 parts by weight, respectively. The above physical properties of the test pieces were evaluated.

The evaluation results are shown in Table 2.

Example 5 In Example 1, the amount of aromatic polyamide blended was 40 parts by weight, and instead of 40 parts by weight of polycapramide in Example 1, polyhexamethylene adipamide with a relative viscosity [η] of 3.6 [Ube Industries, Ltd.] was used. Made of nylon 662026B] 6
A polyamide resin composition and a test piece were obtained in the same manner as in Example 1 except that 0 parts by weight was used, and the above-mentioned physical properties of the obtained test piece were evaluated.

The evaluation results are shown in Table 2.

Comparative Example 2 Polyamide and A resin composition and a test piece were obtained, and the above-mentioned physical properties of the obtained test piece were evaluated.

The evaluation results are shown in Table 2.

Comparative Example 3 In Example 1, instead of 60 parts by weight of aromatic polyamide and 40 parts by weight of polycapramide, the relative viscosity [η
A polyamide resin composition and a test piece were obtained in the same manner as in Example 1, except that 100 parts by weight of 12.95% polyhexamethylene adipamide [manufactured by Ube Industries, Ltd., nylon 662020B] was used. The above physical properties of the test pieces were evaluated.

The evaluation results are shown in Table 2.

Comparative Example 4 In Example 1, instead of 60 parts by weight of aromatic polyamide and 40 parts by weight of polycapramide, the relative viscosity [η
] 2.6 Polycapramide [UNI" Chika, Nylon 6 At (13011RL] 100
A polyamide resin composition and a test piece were obtained in the same manner as in Example 1 except that parts by weight were used, and the above-mentioned physical properties of the obtained test piece were evaluated.

The evaluation results are shown in Table 2.

Example 6 A polyamide resin composition and a test piece were obtained in the same manner as in Example 1, except that the following aromatic polyamide was used in place of the aromatic polyamide used in Example 1. The above physical properties of the test pieces were evaluated.

The evaluation results are shown in Table 2.

1,6-diaminohexane 255.6g (2,2M)
, terephthalic acid (TA) 109.6g (0.66M)
, 225.1 g (1,54 M) of adipic acid (AA) and 0.47 g (4,4
I [1-3M) and 146 ml of ion-exchanged water at 1.0
1 reactor, and after nitrogen purging, 250℃, 35kg/
The reaction was carried out in alf for 1 hour. After the reaction is completed, it is extracted to a receiver whose pressure is set approximately 10 kg/al lower than that of the reactor.
Intrinsic viscosity [η] is 0.18 d//g (concentrated sulfuric acid, 30°C)
510 g of polyamide was obtained.

Next, after drying this polyamide, it was melt-polymerized using a twin-screw extruder at a cylinder set temperature of 310°C to obtain an aromatic polyamide with an intrinsic viscosity [η] of 1.13 dj/g (concentrated sulfuric acid, 30°C). Ta.

The mole % of terephthalic acid component units in this aromatic polyamide was 30%, and the melting point was 281°C.

Claims (1)

[Scope of Claims] 1) 30 to 100 mol% of terephthalic acid component units and 0 aromatic dicarboxylic acid component units other than terephthalic acid component units
Aromatic dicarboxylic acid component unit (a) consisting of ~40 mol% and/or 0 to 70 mol% aliphatic dicarboxylic acid component unit (provided that the total dicarboxylic acid component unit is 100%
expressed as mol%. ), an aromatic polyamide (A) consisting of an aliphatic alkylene diamine component unit and/or an alicyclic alkylene diamine component unit (b); 70 to 30 parts by weight, and represented by the general formula -CH_2-CONH-CH_2- Linear polyamide (B) having an amide bond and a relative viscosity [η_r] of 3.4 or more; 30 to 70 parts by weight (however, the total weight of component (A) and component (B) is 100 parts by weight)
) and inorganic fiber (C); 5 to 2 parts by weight per 100 parts by weight of the total weight of aromatic polyamide (A) and linear polyamide (B).
1. A polyamide resin composition for an engine head cover, comprising: 0.00 parts by weight.