JPH0841243A - Thermoplastic resin molding material - Google Patents

Abstract

PURPOSE:To obtain a thermoplastic resin molding material such as PBT resin molding material capable of obtaining a formed article having a low specific gravity and prevented from burn mark while keeping flame retardance. CONSTITUTION:This is a thermoplastic resin molding material such as PBT resin molding material which contains a thermoplastic resin such as PBT resin and a flame-retardant. In the thermoplastic resin molding material, the flame- retardant is contained in an amount of 15-20 pts.wt. based on 100 pts.wt. of the thermoplastic resin such as PBT resin. Further, the flame-retardant contains antimony trioxide and tetrabromobisphenol A diglycidyl ether having a thermal decomposition initiation temperature of >=320 deg.C Tetrabromoblsphenol A diglycidyl ether is compounded in an amount of 1-3 pts.wt. based on 1 pts.wt. of antimony trioxide.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Polybutylene terephthalate (PBT)
Resin molding material, polyethylene terephthalate (PET)
Aluminum hydroxide is used as a flame retardant for flame retarding thermoplastic resin molding materials such as resin molding materials, polyphenylene sulfide (PPS) resin molding materials, polycarbonate (PC) resin molding materials and polyamide (PA) resin molding materials. There are inorganic fillers having a hydroxyl group such as, a halogen-based flame retardant such as hexabromobenzene, and a halogenated epoxy-based flame retardant.

Among the above-mentioned thermoplastic resin molding materials, PBT
Explaining mainly the resin molding material, the 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, although flame retardation is easy, when an inorganic filler having a hydroxyl group or a phosphorus-based flame retardant such as red phosphorus is used as the flame retardant, a large amount is required, and the specific gravity of the PBT resin molded product is about 1.7. The cost of halogen-based flame retardants is high, and the cost of epoxy-based flame retardants with a low thermal decomposition temperature of about 270 ° C or lower may cause heat history during kneading by an extruder or molding by an injection molding machine. However, there is a problem that the flame retardant is decomposed and the PBT resin molded product is discolored, that is, so-called burning occurs. Similar problems were encountered with thermoplastic resin molding materials other than PBT resin molding materials.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a molded article which has a low specific gravity and prevents burns while maintaining flame retardancy. It is intended to provide a thermoplastic resin molding material such as a PBT resin molding material that can be obtained.

[0006]

A thermoplastic resin molding material according to claim 1 of the present invention is a thermoplastic resin molding material containing a thermoplastic resin and a flame retardant, wherein the thermoplastic resin 1
Containing 15 to 25 parts by weight of flame retardant relative to 00 parts by weight,
The flame retardant is antimony trioxide and the thermal decomposition starting temperature is 3
It is characterized in that it contains tetrabromobisphenol A diglycidyl ether at 20 ° C. or higher, and the ratio of the tetrabromobisphenol A diglycidyl ether to 1 part by weight of antimony trioxide is 1 to 3 parts by weight.

The thermoplastic resin molding material according to claim 2 of the present invention is characterized in that the thermoplastic resin is a PBT resin.

The present invention will be described in detail below. Examples of the thermoplastic resin molding material of the present invention include polybutylene terephthalate (PBT) resin molding material, polyethylene terephthalate (PET) resin molding material, polyphenylene sulfide (PPS) resin molding material, polycarbonate (PC) resin molding material and polyamide (PA). ) Resin molding materials and the like can be exemplified. Of these thermoplastic resin molding materials, for example, the PBT resin molding material will be mainly described. The polybutylene terephthalate resin (hereinafter referred to as PBT resin) used in the present invention is terephthalic acid (TPA) or dimethyl terephthalate. It is manufactured from (DMT) and 1,4-butylene glycol (1,4-BG).

The PBT resin molding material is used as a raw material.
A release agent such as wax, a filler such as talc or mica, if necessary, and a reinforcing material such as glass fiber are used for the BT resin in order to increase mechanical strength, rigidity and deflection temperature under load.

Further, in order to impart flame retardancy, a flame retardant such as antimony trioxide and tetrabromobisphenol A type epoxy is added and used. The PBT resin molding material is obtained by kneading and extruding the above raw materials with a twin-screw extruder or the like at a cylinder temperature of about 240 to 270 ° C., forming a string-like strand, cooling and pelletizing with a pelletizer.

Other thermoplastic resin molding materials can be obtained in substantially the same manner although the raw materials and the like are different. Explaining the flame retardant for imparting flame retardancy, the flame retardant 15 to 2 is added to 100 parts by weight of the thermoplastic resin.
It contains 5 parts by weight. That is, when the flame retardant is less than 15 parts by weight with respect to 100 parts by weight of the thermoplastic resin, the flame retardant effect is small, and when it exceeds 25 parts by weight, the mechanical properties of the thermoplastic resin molded product deteriorate.

The above flame retardant contains antimony trioxide and tetrabromobisphenol A diglycidyl ether having a thermal decomposition starting temperature of 320 ° C. or higher, and the ratio of tetrabromobisphenol A diglycidyl ether to 1 part by weight of antimony trioxide is 1. ~ 3 parts by weight. The thermoplastic resin molding material such as the PBT resin molding material thus blended has a high flame-retardant effect, and has a UL standard flame resistance of U.
Satisfies L94V-0. That is, a PB that can obtain a molded article that has low specific gravity and prevents burning while maintaining flame retardancy
A thermoplastic resin molding material such as a T resin molding material is obtained.

[0013]

In the thermoplastic resin molding material such as PBT resin according to the present invention, the flame retardant 1 is added to 100 parts by weight of the thermoplastic resin.
Since it contains 5 to 25 parts by weight, it is flame retardant. Since the flame retardant is antimony trioxide and tetrabromobisphenol A diglycidyl ether, it has a low specific gravity.
Furthermore, since the thermal decomposition starting temperature of tetrabromobisphenol A diglycidyl ether is 320 ° C. or higher, burning can be reduced.

[0014]

EXAMPLES The present invention will be specifically described below with reference to examples.

Example 1 Table 1 shows PBT resin and flame retardant.
It was used as a raw material for a PBT resin molding material with the composition shown in (1). Flame retardant antimony trioxide and thermal decomposition start temperature 320
C. Tetrabromobisphenol A diglycidyl ether [EBR101: manufactured by Manac Co.] (hereinafter referred to as flame retardant A) was used. The PBT resin molding material was mixed in the composition shown in Table 1 using a corn blender for 10 minutes, and then the above raw materials were supplied to a twin-screw extruder and kneaded and extruded at a cylinder temperature of 240 to 270 ° C. to form a string shape. A PBT resin molding material was obtained by forming a strand, cooling, and pelletizing with a pelletizer.

(Comparative Examples 1 to 4) PBT resin and flame retardant were blended as shown in Table 1 and used as raw materials for PBT resin molding material. Antimony trioxide as a flame retardant, tetrabromobisphenol A diglycidyl ether [ESB-400: manufactured by Sumitomo Chemical Co., Ltd.] having a thermal decomposition starting temperature of 270 ° C. (hereinafter referred to as flame retardant B), aluminum hydroxide and red phosphorus. Using. A PBT resin molding material was obtained in the same manner as in Example 1 except for the above.

The difference in the thermal decomposition starting temperature between the flame retardant A and the flame retardant B is due to the difference in molecular weight and the like.

[0018]

[Table 1]

Regarding the flame resistance of the PBT resin molding materials obtained in the above-mentioned Examples and Comparative Examples, the flame resistance test of UL94 was carried out, and the V-0 level was passed, and the specific gravity was
The test was performed according to ASTM D792, and a value of 1.5 or less was determined to be acceptable. Regarding burning, the injection-molded product was visually checked for the presence or absence of burning, and the results are shown in Table 1.

The results shown in Table 1 show that the PBT resin molding materials of Example 1 of the present invention have a low specific gravity and burn while maintaining flame retardancy as compared with the PBT resin molding materials of Comparative Examples 1 to 4. It was confirmed that a molded product in which the above phenomenon was prevented can be obtained.

[0021]

Since the thermoplastic resin molding material such as the PBT resin molding material according to the present invention is configured as described above, according to the thermoplastic resin molding material such as the PBT resin molding material according to the present invention, While maintaining flame retardance, low specific gravity,
A molded article that prevents burning can be obtained.

Claims (2)

[Claims] 1. A thermoplastic resin molding material containing a thermoplastic resin and a flame retardant, containing 15 to 25 parts by weight of the flame retardant with respect to 100 parts by weight of the thermoplastic resin, wherein the flame retardant is antimony trioxide and It contains tetrabromobisphenol A diglycidyl ether having a thermal decomposition starting temperature of 320 ° C. or higher, and the ratio of the tetrabromobisphenol A diglycidyl ether to 1 part by weight of antimony trioxide is 1 to 3 parts by weight. Thermoplastic resin molding material. 2. A thermoplastic resin molding material, wherein the thermoplastic resin is a PBT resin.