JP2002105312A - Reinforced semiaromatic polyamide resin composition and molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a reinforced semiaromatic polyamide resin excellent in appearance properties, mechanical characteristics, especially rigidity and molding fluidity at high temperatures and to provide a molded product comprising the polyamide resin. SOLUTION: This reinforced semiaromatic polyamide resin composition is characterized in that the polyamide resin composition comprises (A) 30-85 wt.% of a semiaromatic polyamide comprising 70-90 wt.% of hexamethylene adipamide units obtained from adipic acid and hexamethylenediamine and 30-85 wt.% of hexamethylene isophthalamide units obtained from isophthalic acid and hexamethylenediamine and (B) 15-70 wt.% of glass fibers and the flexural modulus Y of elasticity of the composition at 80 deg.C satisfies Y>0.23X-3.7 [the unit of Y is GPa and the X is the content of the glass fibers (wt.%)]. Furthermore, the injection molded product and blow injection molded product comprise the reinforced semiaromatic polyamide resin composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced semi-aromatic polyamide resin excellent in appearance and mechanical properties, particularly, rigidity at high temperature and molding fluidity, and a molded article comprising the same.

[0002]

2. Description of the Related Art Polyamide resins are used in automobiles, machines, and the like by utilizing their excellent mechanical properties, durability and chemical resistance.
Widely used for building materials and housing equipment parts. In particular, a reinforced polyamide resin composition containing a polyamide resin and an inorganic reinforcing agent such as glass fiber replaces metal materials due to its excellent mechanical properties and moldability, and is used to reduce the weight of parts and reduce the number of parts. Useful.

[0003] However, for example, when polyamide 66 resin is mixed with an inorganic reinforcing agent such as glass fiber, inorganic substances are exposed on the surface of a molded product, and its use is limited in exterior parts and the like. Further, the polyamide 6 resin can obtain a relatively good appearance of a molded product even when an inorganic reinforcing agent is blended, but has a drawback in that the rigidity at the time of water absorption or at a high temperature is greatly reduced and the advantage of weight reduction is small. As a polyamide resin composition which compensates for the drawbacks of the polyamide 66 resin and the polyamide 6 resin and enhances the balance between the appearance of the molded article and the rigidity when absorbing water, a binary copolymer comprising hexamethylene adipamide and hexamethylene isophthalamide And terpolymer polyamide comprising hexamethylene adipamide, hexamethylene isophthalamide and caproamide are disclosed in JP-A-6-73288 and JP-A-2000-219.
808.

However, these copolymerized polyamides have low crystallinity and poor rigidity at high temperatures as compared with polyamide 66 resin. Therefore, if the amount of the reinforcing agent is not increased, satisfactory rigidity may be obtained depending on the application. In some cases, it could not be obtained. Increasing the amount of fortifier increases the specific gravity at the same time,
In some cases, the effect of reducing the weight, which is one of the objects of converting a metal material into a resin, is not sufficient.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and improves the appearance and mechanical properties, particularly the rigidity at high temperatures.
It is an object of the present invention to provide a reinforced semi-aromatic polyamide resin excellent in molding fluidity and a molded product comprising the same.

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, the present invention has been achieved by blending glass fibers with a specific polyamide resin so as to satisfy a specific formula. This led to the present invention.

That is, the first of the present invention is (A) 70-90% by weight of hexamethylene adipamide units obtained from adipic acid and hexamethylene diamine, and hexamethylene isophthalamide obtained from isophthalic acid and hexamethylene diamine. A composition comprising 30 to 85% by weight of a semi-aromatic polyamide (hereinafter, polyamide 66 / 6I) containing 10 to 30% by weight of a unit and 15 to 70% by weight of (B) glass fiber, and When the flexural modulus Y at 80 ° C. is Y> 0.23X-3.7 (Y is GP
a and X are reinforced semi-aromatic polyamide resin compositions characterized by satisfying glass fiber content (% by weight).

A second aspect of the present invention is that the semi-aromatic polyamide comprises (A) 70 to 90% by weight of hexamethylene adipamide units obtained from adipic acid and hexamethylene diamine.
And 9 to 29% by weight of hexamethylene isophthalamide units obtained from isophthalic acid and hexamethylene diamine
And caproamide unit 1 obtained from ε-caprolactam
The reinforced semi-aromatic polyamide resin composition according to claim 1, which is a semi-aromatic polyamide containing 10 to 10% by weight (hereinafter, polyamide 66 / 6I / 6).

A third aspect of the present invention is the reinforced semi-aromatic polyamide resin composition according to the first or second aspect of the present invention, wherein the semiaromatic polyamide has a formic acid solution viscosity of 15 to 25.

A fourth aspect of the present invention is an injection molded article comprising the reinforced semi-aromatic polyamide resin composition according to the first, second or third aspect of the present invention.

A fifth aspect of the present invention is a hollow injection molded article comprising the reinforced semi-aromatic polyamide resin composition, wherein the injection molded article according to the fourth aspect of the present invention has a hollow portion.

A sixth aspect of the present invention is the fourth or fifth aspect of the present invention.
An injection molded article comprising a reinforced semi-aromatic polyamide resin composition, wherein the injection molded article or the hollow injection molded article described above is a roof rail.

The semi-aromatic polyamide used in the present invention is substantially composed of 70 to 90% by weight of hexamethylene adipamide units obtained from adipic acid and hexamethylene diamine.
And 10 to 30% by weight of hexamethylene isophthalamide units obtained from isophthalic acid and hexamethylene diamine. Hexamethylene isophthalamide unit is 10
If the amount is less than the weight percentage, the glass fiber is likely to be exposed on the surface of the molded product, and it is difficult to obtain an excellent appearance. Further, the rigidity after water absorption is greatly reduced, and the rigidity level is not sufficient for some applications. If this is supplemented with the amount of glass fiber, the appearance is further deteriorated and the weight reduction effect is reduced. When the hexamethylene isophthalamide unit is more than 30%,
Deterioration of crystallinity is remarkable, rigidity decrease at high temperature is large, depending on the application, the rigidity level is not enough, or if this is supplemented with the amount of glass fiber, the appearance will be further deteriorated, and the weight reduction effect To reduce. In addition, since the glass transition point is high, the fluidity is reduced, and it is difficult to obtain a good appearance unless a high-temperature mold is used. Further, polyamide 66 / 6I / 6 obtained by copolymerizing semi-aromatic polyamide 66 / 6I with polyamide 6 component can be suitably used. Polyamide When the polyamide 6 component is further copolymerized, the crystallization temperature is lowered, and a molded article having excellent gloss is easily obtained. However, when the amount of the polyamide 6 component exceeds 10% by weight, the flexural modulus at 80 ° C. becomes low, which is not preferable.

The semi-aromatic polyamide 66 / 6I or polyamide 66 / 6I / 6 of the present invention can be blended with another polyamide as long as the object of the present invention is not impaired. Other polyamides are, for example, polyamide 46,
Polyamide 66, polyamide 612, polyamide 61
0, polyamide 6, polyamide 12, polyamide 11,
Polyamide MXD6, Polyamide 6T, Polyamide 6I
And the like. Also, the polyamide 66/6 of the present invention
Other polyamide-forming components can also be copolymerized with I. Other polyamide-forming components include lauramide units obtained from ω-lauryl lactam, hexamethylene sebacamide units obtained from sebacic acid and hexamethylene diamine, hexamethylene dodecane amide units obtained from dodecane diacid and hexamethylene diamine. And hexamethylene terephthalamide units obtained from terephthalic acid and hexamethylene diamine. Specifically, polyamide 66 / 6I / 12,
Polyamide 66 / 6I / 610, Polyamide 66 / 6I
/ 612 and polyamide 66 / 6I / 6T.
The blending amount of these other polyamides and other copolymerization components must be within a range that does not impair the crystallinity,
Although not particularly limited, it is generally within 10% by weight of the semi-aromatic polyamide of the present invention.

The viscosity of the semiaromatic polyamide of the present invention in a formic acid solution (JIS K 6816) is not particularly limited, but is preferably 15 to 25. If the formic acid solution viscosity is lower than 15, the mechanical properties, particularly the strength and the impact properties, are inferior and the use may be limited. Further, when the formic acid solution viscosity exceeds 25, especially in a large-sized molded product or a thin-walled molded product, the fluidity may not be sufficient, and it may be difficult to obtain a good appearance, or due to the influence of viscosity, during injection molding. In addition, the glass fiber is broken, and the rigidity tends to be unsatisfactory.

As the glass fibers used in the present invention, those usually used for thermoplastic resins can be used, and there are no particular restrictions on the glass fiber diameter or the chop length of the glass fibers as a raw material. Any of 25 μm chopped strand, roving, and milled fiber may be used. When a chopped strand is used, its length can be appropriately selected and used within a range of 0.1 to 12 mm.

Further, a material obtained by adhering a generally known silane coupling agent to the surface of glass fiber may be used.
For example, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-β (aminoethyl) -γ-aminopropyltrimethoxysilane, vinyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane and the like are used. it can. Further, as the sizing agent, a glass fiber treated with a known sizing agent such as a urethane resin, a maleic anhydride-modified butadiene resin, a styrene maleic anhydride, or acrylic acid can be used.

The amount of glass fiber in the composition of the present invention is 15 to 70% by weight, preferably 33 to 65% by weight.
And the flexural modulus Y of the composition at 80 ° C.
, Y> 0.23X-3.7 (Y units are GPa, X
Must satisfy the glass fiber content (% by weight)). If the amount of the glass fiber is less than 15% by weight, the reinforcing effect is not sufficient, and it is difficult to substitute a metal material. When the blending amount of the glass fiber is more than 70% by weight, it becomes difficult to obtain a molded article having excellent appearance even when the semi-aromatic polyamide of the present invention is used. The flexural modulus Y at 80 ° C. is Y
If ≦ 0.23X−3.7, the effect of improving the flexural modulus at high temperatures according to the glass fiber content is not sufficient, the balance between the specific gravity and the rigidity is poor, and the resin material of the metal material is lightweight. The advantage of the conversion is reduced. There is no particular limitation on the method for the flexural modulus Y at 80 ° C. to satisfy Y> 0.23X-3.7. For example, the obtained molded product is treated at a temperature not lower than the glass transition point of the semi-aromatic polyamide. Then, the method of increasing the crystallinity by annealing, or the ratio of the fiber length to the diameter of the glass fiber (hereinafter referred to as L / D, where L is the weight average fiber length, and D is the number average fiber diameter) )) For a long time. Considering productivity, dimensional stability, etc.,
A method of keeping the L / D of the glass fiber long is effective. For example, the general L / D of a polyamide 66 resin composition reinforced with 50% by weight of glass fiber having a diameter of 10 μm is 20 to 3
0, and after injection molding, L / D 15 to 25
According to the glass fiber blending method described later, the L / D is 40 to 80 in the composition, and the L / D is
Can be maintained at about 30 to 50, and Y> 0.23X-3.7.
Is obtained.

The above method is merely an example of a method for obtaining a composition satisfying Y> 0.23X-3.7, and does not limit the present invention in any way.
This is merely an example in which the glass fiber diameter is 10 μm and the concentration is 50% by weight, and Y> 0.23X−
The L / D range for satisfying 3.7 is not constant.

The flexural modulus at 80 ° C. of the present invention is A
According to STM D790, using a test piece with a thickness of 3 mm,
It was measured by a three-point bending test method with a span of 508 mm at a bending speed of 5 mm / min using a bending tester equipped with a thermostat in an environment of 80 ° C. The temperature of 80 ° C., for example, in the case of the interior and exterior of an automobile, is usually the highest temperature that can be considered when considering the temperature rise during the day,
This temperature is widely used as a test for resin properties. Also, building materials and housing equipment-related parts are often designed on the assumption that a high temperature of about 80 ° C. is set as the upper limit of the ordinary temperature.

The method for producing the polyamide resin composition of the present invention is not particularly limited, and a method of melt-kneading the semi-aromatic polyamide of the present invention and glass fiber in a commonly used single-screw or twin-screw extruder is used. General.
As a method of keeping the L / D of the glass fiber high, for example, the temperature of the melt-kneading is set to a high temperature within a range in which the polyamide does not have an adverse effect due to decomposition, and the discharge amount, screw design and rotation speed, raw material supply position, die design are adjusted. And a method of extruding under conditions where glass fibers are not as sheared as possible within a range where the strand can be drawn stably.

The reinforced semi-aromatic polyamide resin composition of the present invention is usually obtained in the form of pellets, and the pellets can be used to form molded articles by various moldings, for example, compression molding, injection molding, extrusion molding and the like. .

The effect of using the reinforced semi-aromatic polyamide resin composition of the present invention is particularly remarkable in an injection molded product, and is effective in a hollow molded product by gas assist molding or the like from the viewpoint of weight reduction. is there. Further, it includes a molded product obtained by special injection molding such as two-color molding and injection compression molding as long as the object of the present invention is not impaired. In addition, depending on the use, the molded product may be subjected to embossing or painting on the entire surface or a part thereof.
As the injection molding conditions, for example, a molding temperature of 250 to 3
A molding method in a range of 10 ° C. and a mold temperature of 40 to 120 ° C. can be exemplified.

The roof rail in the present invention is a rail for holding luggage and the like attached to the roof of an automobile. Conventionally, metal rails have been used to prevent deformation due to loads such as luggage. However, in the case of metal, in addition to the rails, legs for attaching to the roof of the automobile are required, and it is necessary to combine at least three points. In order to solve this problem, the number of parts can be reduced by integrally molding the leg and the rail with resin. However, the conventional resin composition is inferior to the metal rail in elastic modulus and suppresses deformation due to load, so that the rail has to be thickened, and the effect of reducing the weight of the metal may not be sufficient. Since the roof rail obtained by injection molding or hollow injection molding using the semi-aromatic polyamide resin composition of the present invention has a high elastic modulus, it is effective in improving productivity by reducing the weight of automobiles and reducing the number of parts. .

The polyamide resin composition of the present invention may contain one or more conventional additives such as stabilizers and inhibitors against oxidation, heat, and ultraviolet light degradation, as long as the objects of the present invention are not impaired. Agents and release agents, coloring agents including dyes and pigments, nucleating agents, foaming agents, plasticizers, inorganic fillers, flame retardants, antistatic agents, and the like can be appropriately added.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. The evaluation in Examples and Comparative Examples was performed by the following method.

(1) Formic acid solution viscosity: The resin composition was dissolved in formic acid, and the glass fiber was filtered and removed. After that, the polymer solution was recovered and measured according to JIS K6810.

(2) Average L / D of glass fiber: The reinforced polyamide resin composition pellets and the molded product were dissolved in 90% formic acid to dissolve the polyamide and precipitate the glass fiber, and the obtained precipitate was observed under an optical microscope. Observed at and randomly selected 3
The length and diameter of 00 to 1000 glass fibers were measured using an image analyzer IP-1000 manufactured by Asahi Kasei Corporation, and the weight average fiber length and number average fiber diameter were determined. From the obtained results, the value obtained by dividing the number average fiber diameter by the weight average fiber length was defined as the average L / D of the glass fibers. The molded product is
A molded product obtained by the same method as the molded product subjected to the bending characteristic evaluation in the section (4) was used.

(3) Specific gravity of molded article: Using a molded article obtained by the same method as the molded article subjected to the bending characteristic evaluation in the section (4), the measurement was carried out by an underwater displacement method in accordance with JIS K7112.

(4) Bending characteristics (strength and elastic modulus): Using an IS50EP injection molding machine manufactured by Toshiba Machine Co., Ltd., the injection pressure and speed are appropriately adjusted so that the filling time is about 1 second at a cylinder temperature of 290 ° C. This was adjusted to obtain a test piece having a thickness of 3 mm.

The mold temperature was appropriately set in the range of 80 to 120 ° C. according to the glass transition temperature of the composition. Using the obtained test piece, a three-point bending test was performed at a bending speed of 5 mm / min and a span of 508 mm according to ASTM D790. To measure the flexural modulus Y at 80 ° C.,
Orientec Co., Ltd. Tensilon with thermostat U
TM-2.5T was used.

(5) Surface glossiness: I manufactured by Toshiba Machine Co., Ltd.
Using S150E injection molding machine, cylinder temperature 290 ° C
The injection pressure and speed were appropriately adjusted so that the filling time was about 1 second to obtain a 130 x 130 x 3 mm flat molded product. For this plate, use a gloss meter (IG3 manufactured by HORIBA)
Using 20), a 60-degree gloss was measured according to JIS-K7150.

For more sensitive evaluation, a carbon black polyamide master batch F-36600B-20S manufactured by Dainippon Ink and Chemicals, Inc. was used.
2.5 parts were blended and colored black before injection molding.
In Examples and Comparative Examples, the following polyamide resins and glass fibers were used.

(1) Polyamide resin A-1) Polyamide 66: Leona 1300 manufactured by Asahi Kasei Corporation A-2) Polyamide 6: SF manufactured by Ube Industries, Ltd.
1013A A-3) Polyamide MXD6: Reny 6002 manufactured by Mitsubishi Engineering-Plastics Corporation A4) Polyamide 66 / 6I copolymer 1: Production Example 1
Created according to. 6I ratio 18% by weight Formic acid solution viscosity 27 A-5) Polyamide 66 / 6I copolymer 2: Production Example 2
Created according to. 6I ratio 21% by weight Formic acid solution viscosity 27 A-6) Polyamide 66 / 6I copolymer 2: Production Example 3
Created according to. 6I ratio 21% by weight Formic acid solution viscosity 17 A-7) Polyamide 66 / 6I copolymer 3: Production Example 4
Created according to. 6I ratio 27% by weight Formic acid solution viscosity 22 A-8) Polyamide 66 / 6I copolymer 4: Production Example 5
Created according to. 6I ratio 35% by weight formic acid solution viscosity 17

(2) Glass fiber B-1) Asahi Fiber Glass Co., Ltd. CS03J
A416 Average fiber diameter 10 μm B-2) Asahi Fiberglass Co., Ltd. CS03M
A416 Average fiber diameter 13 μm B-3) ECS03T27 manufactured by NEC Corporation
5GH average fiber diameter 10μm

Production Example 1 Equimolar salt of adipic acid and hexamethylenediamine 2.0
5 kg, an equimolar salt of isophthalic acid and hexamethylenediamine (0.45 kg) and pure water (2.5 kg) were charged into a 5-liter autoclave and sufficiently purged with nitrogen while stirring. The temperature was raised from room temperature to 220 ° C. in about 1 hour while stirring was continued. Thereafter, the temperature was raised to 260 ° C. over about 2 hours while removing water from the reaction system so that the internal pressure of the autoclave became 18 kg / cm ² -G. Thereafter, the heating was stopped, the autoclave was closed, and cooled to room temperature over about 8 hours to obtain about 2 kg of a polymer. The obtained polymer was pulverized and subjected to solid-phase polymerization at 200 ° C. for 10 hours under a nitrogen stream using a 10-liter evaporator to further increase the molecular weight. The formic acid solution viscosity becomes 1 due to solid state polymerization.
From 1 to 27.

Production Example 2 Equimolar salt of adipic acid and hexamethylenediamine 1.9
75 kg, equimolar salt of isophthalic acid and hexamethylenediamine 0.525 kg, 0.19 g and pure water 2.5 kg
Was charged into a 5-liter autoclave and sufficiently purged with nitrogen. The temperature was raised from room temperature to 220 ° C. in about 1 hour while stirring was continued. Thereafter, while removing water from the reaction system so that the internal pressure of the autoclave becomes 18 kg / cm ² -G, the temperature was raised to 260 ° C. for about 2 hours.
The temperature was raised to ° C. Thereafter, the heating was stopped, the autoclave was closed, and cooled to room temperature over about 8 hours to obtain about 2 kg of a polymer. The obtained polymer was pulverized and subjected to solid-phase polymerization at 200 ° C. for 10 hours under a nitrogen stream using a 10-liter evaporator to further increase the molecular weight. The solid solution polymerization resulted in a formic acid solution viscosity of 10 to 27.

Production Example 3 Equimolar salt of adipic acid and hexamethylenediamine 1.9
75 kg, equimolar salt of isophthalic acid and hexamethylenediamine 0.525 kg, adipic acid 0.1 for molecular weight control
9 g and 2.5 kg of pure water were charged into a 5-liter autoclave and sufficiently purged with nitrogen while stirring well. The temperature was raised from room temperature to 220 ° C. in about 1 hour while stirring was continued. Thereafter, the internal pressure of the autoclave was increased to 18 kg / c.
The temperature was raised to 260 ° C. over about 2 hours while removing water from the reaction system so as to obtain m ² -G. Thereafter, the heating was stopped, the autoclave was closed, and cooled to room temperature over about 8 hours to obtain about 2 kg of a polymer. The obtained polymer was pulverized and subjected to solid-phase polymerization at 200 ° C. for 10 hours under a nitrogen stream using a 10-liter evaporator to further increase the molecular weight. Formic acid solution viscosity is 10 to 17 by solid state polymerization.
Became.

Production Example 4 Equimolar salt of adipic acid and hexamethylenediamine 1.8
75 kg, equimolar salt of isophthalic acid and hexamethylenediamine (0.675 kg) and pure water (2.5 kg) were charged into a 5-liter autoclave and sufficiently purged with nitrogen while stirring. The temperature was raised from room temperature to 220 with continuous stirring.
The temperature was raised to about 1 hour in about 1 hour. Thereafter, the temperature was raised to 260 ° C. over about 2 hours while removing water from the reaction system so that the internal pressure of the autoclave became 18 kg / cm ² -G. Then, stop heating, close the autoclave, and
After cooling to room temperature over time, about 2 kg of polymer was obtained. The obtained polymer was pulverized and subjected to solid-phase polymerization at 200 ° C. for 8 hours under a nitrogen stream using a 10-liter evaporator to further increase the molecular weight. The solid solution polymerization resulted in a formic acid solution viscosity of 10 to 22.

Production Example 5 Equimolar salt of adipic acid and hexamethylenediamine 1.6
25 kg, equimolar salt of isophthalic acid and hexamethylenediamine 0.875 kg, adipic acid 0.1 for controlling molecular weight
9 g and pure water (2.5 kg) were charged into a 5-liter autoclave and sufficiently purged with nitrogen while stirring well. The temperature was raised from room temperature to 220 ° C. in about 1 hour while stirring was continued. Thereafter, the internal pressure of the autoclave was increased to 18 kg /
While removing water out of the reaction system so as to obtain cm ² -G, about 2 cm
The temperature was raised to 260 ° C. over time. Thereafter, the heating was stopped, the autoclave was closed, and cooled to room temperature over about 8 hours to obtain about 2 kg of a polymer. The obtained polymer was pulverized and subjected to solid-phase polymerization at 200 ° C. for 8 hours under a nitrogen stream using a 10-liter evaporator to further increase the molecular weight. The solid solution polymerization resulted in a formic acid solution viscosity of 10 to 17.

[0041]

Example 1 A-4) was used as polyamide and B-3) was used as glass fiber. Polyamide from Toshiba Machine Co., Ltd.
It is supplied at 30 kg / hr from the uppermost stream supply port of the same-direction twin screw extruder TEM35 (L / D47) manufactured by the company, and the glass fiber is:
Side feeding was performed at a rate of 30 kg / hr to a downstream portion where the polyamide was melted. The barrel temperature was 290 ° C., the screw rotation speed was 300 rotations, the degree of vent vacuum was 60 cmHg, and the discharge rate was 60 kg / hr. In addition, the screw configuration is such that L is upstream of the glass supply position for plasticizing the polyamide.
/D8.5 kneading block and L / D0.4
And only one forward screw was provided except that one L / D 0.4 reverse screw was provided downstream of the glass fiber supply position to disperse the glass fibers. The die used had a diameter of 3 mm and an orifice of 4 holes. The molten resin composition extruded from the die was cooled in a cold water bath and then continuously cut into pellets to obtain a glass fiber reinforced semi-aromatic polyamide resin composition. Table 1 shows the evaluation results of the obtained glass fiber reinforced semi-aromatic polyamide resin composition. 8 compared to the comparative example having the same glass fiber concentration, in other words, the same specific gravity.
Excellent flexural modulus and surface gloss at 0 ° C.

[0042]

Examples 2 to 7 A glass fiber reinforced semi-aromatic polyamide resin composition was obtained in the same manner as in Example 1 except that the kind of polyamide, the kind of glass fiber, and the amount were changed as shown in Table 1. In each case, the flexural modulus at 80 ° C. and the surface glossiness are well balanced.

[0043]

[Table 1]

[0044]

Comparative Examples 1 to 3 A glass fiber reinforced semi-aromatic polyamide resin composition was obtained in the same manner as in Example 1 except that the polyamide type was changed as shown in Table 2. In polyamide 66,
Although the flexural modulus at 80 ° C. is excellent, the surface gloss is poor. Polyamide 6 is inferior in flexural modulus at 80 ° C. Polyamide MXD6 is excellent in flexural modulus at 80 ° C., but the mold temperature needs to be 100 ° C. or higher in order to obtain a molded product having high specific gravity and excellent surface gloss.

[0045]

Comparative Example 4 The same polyamide type and glass fiber type as in Example 5 were used. It was manufactured under the same extruder and extrusion conditions as in Example 1. However, the screw configuration of the extruder was changed so that the kneading of L / D 2.8 and the L / D
A reverse screw of 0.8 was provided to enhance the kneading properties of the glass fiber.
Compared with Example 5, the L / D of the glass fiber was small,
Poor in flexural modulus at 80 ° C.

[0046]

Comparative Example 5 A glass fiber reinforced semi-aromatic polyamide resin composition was obtained in the same manner as in Example 1, except that the kind of polyamide and the kind of glass fiber were changed as shown in Table 2. 8
The flexural modulus at 0 ° C. is excellent, but the surface gloss is poor and the specific gravity is high.

[0047]

Comparative Example 6 A glass fiber reinforced semi-aromatic polyamide resin composition was obtained in the same manner as in Example 1, except that the kinds of polyamide and glass fiber were changed as shown in Table 2. 8
Poor flexural modulus and surface gloss at 0 ° C.

[0048]

[Table 2]

[0049]

According to the composition of the present invention, a molded article having excellent mechanical properties and surface gloss can be efficiently obtained, which is effective for reducing the weight of parts. With the composition of the present invention, for example,
Parts such as car door mirror stays, roof rails, door handles, sunroof deflectors, wiper arms, spoilers, wheel caps, slide switches, switch covers, console boxes, sun visor arms, radiator grills, spoilers, wheel caps, etc., as well as housing equipment and furniture In applications, it can be effectively used for components such as chairs and desk legs, top plates, backrests, crescents and handrails.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08J 5/00 CFG C08J 5/00 CFG 4J002 5/04 CFG 5/04 CFG C08K 7/14 C08K 7/14 // B29K 77:00 B29K 77:00 105: 12 105: 12 B29L 22:00 B29L 22:00 31:30 31:30 F term (reference) 3D020 AA01 AB01 AC01 AD01 AD26 4F071 AA54 AA55 AA88 AB28 AD01 AF17Y AH03 AH07 AH11 AH17 BB03 BB05 BB06 BC04 BC07 4F072 AB09 AD44 AG05 AH04 AK04 AK15 AL16 AL17 4F206 AA29C AB25 AG07 AH18 JA05 JA07 JF01 JF02 4J001 DA01 DB02 DB05 EA06 EB08 EB36 EC08 FA01 FA03 J02 02 CL051 DL006 FA046 GL00 GN00

Claims (6)

[Claims] 1. A hexamethylene adipamide unit (A) obtained from adipic acid and hexamethylene diamine
~ 90% by weight, and hexamethyleneisophthalamide unit 1 obtained from isophthalic acid and hexamethylenediamine.
A composition comprising 30 to 85% by weight of a semi-aromatic polyamide containing 0 to 30% by weight and 15 to 70% by weight of (B) glass fiber, and the composition has a flexural modulus Y at 80 ° C. , Y> 0.23X-3.7 (the unit of Y is GP
a, X satisfies the glass fiber content (% by weight)). 2. A semi-aromatic polyamide comprising (A) 70 to 90% by weight of hexamethylene adipamide units obtained from adipic acid and hexamethylene diamine, and hexamethylene isophthalamide units obtained from isophthalic acid and hexamethylene diamine. The reinforced semi-aromatic polyamide resin composition according to claim 1, comprising 9 to 29% by weight and 1 to 10% by weight of a caproamide unit obtained from ε-caprolactam. 3. The semiaromatic polyamide having a formic acid solution viscosity of 1
The reinforced semi-aromatic polyamide resin composition according to claim 1 or 2, wherein the composition is 5 to 25. 4. An injection-molded article comprising the reinforced semi-aromatic polyamide resin composition according to claim 1, 2 or 3. 5. A hollow injection molded product comprising the reinforced semi-aromatic polyamide resin composition, wherein the injection molded product according to claim 4 has a hollow portion. 6. An injection molded article comprising a reinforced semi-aromatic polyamide resin composition, wherein the injection molded article or the hollow injection molded article according to claim 4 is a roof rail.