JP3487034B2 - PBT resin molding material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PBT resin molding material used for, for example, electric / electronic parts, automobile parts and the like.

[0002]

2. Description of the Related Art PBT resin is a polybutylene terephthalate resin, and this plastic is a kind of aromatic polyester having an ester group in the molecule and is a crystalline thermoplastic engineering plastic. PBT resin molding material has a good balance of physical properties such as heat resistance, chemical resistance, electrical characteristics, and mechanical characteristics, and has extremely good moldability, so it is widely used as a material for electric / electronic parts, automobile parts, etc. It's being used.

Since the PBT resin molding material is a crystalline resin, when it is reinforced with glass fiber, mechanical strength, rigidity, deflection temperature under load, etc. are dramatically improved. In addition, flame retardation is easy, and an excellent flame retardant grade is supplied.
However, the glass fiber reinforced PBT resin molding material has a drawback that impact strength, tracking resistance and dimensional stability are poor.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to make a glass fiber reinforced PBT resin excellent in impact strength, tracking resistance and flatness. To provide a molding material.

[0005]

The PBT resin molding material according to claim 1 of the present invention comprises (1) PBT resin, (2) non-crystalline thermoplastic resin imparting high dimensional accuracy, and ABS
A resin , (3) as a thermoplastic resin imparting tracking resistance, any one of a modified polyolefin resin having a reactive functional group of a silanol group or a carboxyl group, a polyamide resin, or a methyl methacrylate resin, (4 ) A glass fiber is contained.

[0006]

The PBT resin molding material according to claim 2 of the present invention is (2) an amorphous thermoplastic resin imparting high dimensional accuracy according to claim 1, wherein the ABS resin is one of the above (1) to
It is characterized by containing 15 to 30% by weight with respect to the resin component of (3).

[0008]

The PBT resin molding material according to claim 3 of the present invention is (3) a modified polyolefin having a reactive functional group of a silanol group or a carboxyl group as the thermoplastic resin imparting tracking resistance (3). One of the resin, the polyamide resin, and the methyl methacrylate resin is contained in an amount of 20 to 50% by weight based on the resin components (1) to (3).

The PBT resin molding material according to claim 4 of the present invention is characterized in that it also contains a flame retardant.

In the PBT resin molding material according to the fifth aspect of the present invention, the compatibilizing agent is 1 relative to the total amount of the PBT resin molding material.
It is characterized by containing 10 to 10% by weight.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

The PBT resin molding material according to the present invention is
(1) PBT resin, (2) non-crystalline thermoplastic resin that imparts high dimensional accuracy, ABS resin , (3) thermoplastic resin that imparts tracking resistance, silanol group or
Is a modified polyolefin resin having a reactive functional group of a carboxyl group, a polyamide resin, or any one resin of methylmethacrylate resin, and (4) glass fiber, and polybutylene terephthalate used in the present invention. Resin (hereinafter referred to as PBT resin) is terephthalic acid (TPA) or dimethyl terephthalate (DMT) and 1,4? Butylene glycol (1,4? B
G) and manufactured.

(2) ABS resin is indispensable as the non-crystalline thermoplastic resin imparting high dimensional accuracy used in the present invention, and the content thereof is the above (1) to (3) constituting the PBT resin molding material. 20 to 50% by weight with respect to the resin component).

As the thermoplastic resin (3) imparting tracking resistance used in the present invention, any one of a modified polyolefin resin having a silanol group or a reactive functional group of a carboxyl group, a polyamide resin, or a methyl methacrylate resin is used. It is necessary to use two resins.

Examples of the modified polyolefin resin having a silanol group- or carboxyl group-reactive functional group include:
Polypropylene is used.

The polyamide resin used in the present invention (hereinafter referred to as PA
Resin) is produced by polycondensation of diamine and dicarboxylic acid, polycondensation of aminocarboxylic acid, or ring-opening polymerization of lactam.

The methyl methacrylate resin (hereinafter referred to as MMA resin) used in the present invention is produced by producing acetone cyanohydrin with hydrogen cyanide and acetone, and dehydrating the acetone cyanohydrin with concentrated sulfuric acid with this acetone. .

As the compatibilizing agent used in the present invention, a low molecular weight polypropylene (hereinafter referred to as PP) having a reactive functional group such as a silanol group or a carboxyl group grafted can be used. To 1
The content of 10 to 10 wt% is preferable because the impact strength is improved. The number average molecular weight of this low molecular weight PP is 3
It is preferably 000 to 15,000.

The PBT resin molding material of the present invention is obtained by using the following raw materials for the PBT resin.

Glass fiber is used as a reinforcing material in order to increase mechanical strength, rigidity and deflection temperature under load, and ABS is used as an amorphous thermoplastic resin in order to provide high dimensional accuracy.
A resin is further used, and a thermoplastic resin which imparts tracking resistance is used, and as the thermoplastic resin, a modified polyolefin resin having a silanol group or a reactive functional group of a carboxyl group, or a polyamide resin, or methyl methacrylate. It is necessary to use one of the resins. The modified polyolefin resin preferably has a number average molecular weight of 200,000 to 500,000.

Further, a flame retardant is used to impart flame retardancy, and preferably a flame retardant such as antimony trioxide and tetrabromobisphenol A type epoxy is used. Further, a release agent such as wax and a pigment are used, and if necessary, a filler such as talc and mica is used.

In the PBT resin molding material of the present invention, the above raw materials are heated by a twin-screw extruder or the like to obtain a cylinder temperature of 240 to 26.
Kneading and extruding at about 0 ° C to make a string-like strand,
It is manufactured by pelletizing with a pelletizer after cooling. In this process, the PBT resin, the ABS resin, and the thermoplastic resin that imparts tracking resistance form a polymer alloy, and act as a binder for the glass fiber, so that the impact strength, tracking resistance, and flatness (warpage) are good. A molding material is obtained which is able to give moldings with properties.

Specifically, regarding the Izod impact strength (notched) (ASTM D256), the conventional glass fiber reinforced PBT resin molding material is 6 kgf · c.
m / cm, ABS resin or ABS resin and a polymer alloy product of PC resin and PBT resin,
As a thermoplastic resin having a tracking resistance of 8 to 10 kgf · cm / cm, a modified polyolefin resin having a silanol group or a carboxy group-reactive functional group, a polyamide resin, or a methyl methacrylate resin. ABS resin and P
10 to 12 kgf for polymer alloy products with BT resin
・ It becomes cm / cm, and Izod impact strength is improved.

The flatness (warpage) can be improved by suppressing the crystallization shrinkage by adding the amorphous resin component of the ABS resin to the crystalline resin of PBT.

In addition, the DIN KA method (DIN 5348
Tracking resistance based on 0) is based on the conventional glass fiber reinforced PBT resin molding material having 2 to 10 drops, but using a thermoplastic resin which imparts tracking resistance, for example, silanol group or carboxyl group. PB using one of modified polyolefin resin having polyamide, polyamide resin, or methyl methacrylate resin
In the case of a polymer alloy product with T resin, the number of drops is 50 or more, and the tracking resistance is remarkably improved.

Further, the number average molecular weight is 3,000 to 1,500.
A conventional glass fiber reinforced PBT containing 1 to 10% by weight of a compatibilizing agent such as maleic anhydride-modified low molecular weight polypropylene of 0 with respect to the total amount of the PBT resin molding material.
The resin molding material is 6 to 7 kgf · cm / cm, whereas the polymer alloy product of the modified polyolefin and the PBT resin has about 12 kgf · cm / cm, which further improves the Izod impact strength.

[0028]

EXAMPLES (Examples 1 to 4 and Comparative Examples 1 to 7) Hereinafter, the present invention will be specifically described with reference to Examples.

PBT resin, ABS resin, thermoplastic resin for imparting tracking resistance, for example, modified polyolefin resin having a reactive functional group of silanol group or carboxyl group, polyamide resin, or methyl methacrylate resin. Among them, one resin component, glass fiber, a compatibilizer, and a flame retardant were blended as shown in Table 1 to prepare a raw material for a PBT resin molding material.

Here, as the resin, PBT resin (manufactured by Mitsubishi Rayon Co., Ltd .: Toughpet PBT N1300),
ABS resin (manufactured by Japan Synthetic Rubber Co., Ltd .: JSR ABS
XT400), PC resin (Mitsubishi Chemical Corporation: Iupilon S1000) is used.

As the modified polyolefin resin,
In Example 1 , a silanol group-modified PP resin having a number average molecular weight of 400,000 (ZP1101 manufactured by Ube Industries, Ltd.), and in Example 2 , a carboxyl group-modified PP resin having a number average molecular weight of 400,000 (Ube) was used. Kosan Co., Ltd .: ZP644) is used, and in Examples 3 and 4, a polyamide resin (Toray Co., Ltd .: Amilan CM1017) is used.

As the compatibilizing agent, maleic anhydride-modified low-molecular PP having a number average molecular weight of 5000 (manufactured by Sanyo Kasei Co., Ltd .: Umex 1001), and as the flame retardant, antimony trioxide and tetrabromobisphenol A type epoxy resin. 1 to 1 part by weight, with the flame retardant compounded, the flame retardant is added to the total amount of the PBT resin molding material at 15 parts by weight.
It was made to contain by weight%.

The glass fiber has a fiber length of 3 mm and a fiber diameter of 10
Glass fibers (Chapted Strand ES03? TP70 manufactured by Nippon Glass Fiber Co., Ltd.) having a thickness of 13 μm are used.

The PBT resin molding materials of Examples and Comparative Examples of the present invention were prepared by removing the glass fibers in the composition shown in Table 1 and mixing them for 10 minutes using a corn blender, and then feeding the above raw materials to a twin-screw extruder. The glass fiber was fed by side feed so that the content of the PBT resin molding material was 20% by weight, and kneaded and extruded at a cylinder temperature of 240 to 260 ° C to form a string-like strand, which was cooled and then pelletized. A PBT resin molding material was obtained by making a pellet having an average particle diameter of 3.0 mm.

Regarding the Izod impact strength of the PBT resin molding materials obtained in the above Examples and Comparative Examples, ASTM D
256, the tracking resistance was measured by making a test piece according to the DIN KA method (DIN 53480). In addition, the flatness, which has high dimensional accuracy, is 1
A 10 mm × 70 mm square test piece having a thickness of 2 mm was molded and mounted on a surface plate to measure the warpage. The results are shown in Table 1.
It was shown to.

[0036]

[Table 1]

[0038]

EFFECTS OF THE INVENTION PB according to claims 1 to 5 of the present invention
The T resin molding material is a non-crystalline thermoplastic resin that imparts high dimensional accuracy to the PBT resin, an ABS resin , or a silanol group or a thermoplastic resin that imparts tracking resistance.
Is a modified polyolefin resin having a reactive functional group of a carboxyl group, or a polyamide resin, or while containing any one resin of a methyl methacrylate resin and glass fiber, while maintaining impact strength and tracking resistance, Excellent flatness.

The PBT resin molding material according to claim 5 of the present invention contains a compatibilizing agent such as maleic anhydride-modified low-molecular polypropylene in an amount of 1 to 10% by weight based on the total amount of the PBT resin molding material. Further, the impact strength is improved.

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Claims (5)

(57) [Claims] 1. (1) PBT resin, (2) ABS resin as a non-crystalline thermoplastic resin imparting high dimensional accuracy,
(3) As the thermoplastic resin imparting tracking resistance, a modified polyolefin resin having a silanol group or a carboxyl group-reactive functional group, or a polyamide resin,
Or any one resin of methyl methacrylate resin,
(4) A PBT resin molding material containing glass fiber. 2. The (2) non-crystalline thermoplastic resin which imparts high dimensional accuracy according to claim 1, is contained in an amount of 15 to 30% by weight with respect to the resin components of (1) to (3). The PBT resin molding material according to claim 1, which is characterized in that. 3. The thermoplastic resin for imparting tracking resistance (3) according to claim 1 is contained in an amount of 20 to 50% by weight based on the resin components (1) to (3). The PBT resin molding material according to claim 1. 4. A PBT resin molding material according to any one of claims 1 to 3, characterized in that also contained a flame retardant. 5. The PBT resin molding material according to any one of claims 1 to 4 a compatibilizing agent, characterized in that contained 10 wt% based on the total amount of PBT resin molding material.