JPS61261337A - Flame-retarding resin composition - Google Patents

Abstract

PURPOSE:To obtain a flame-retarding resin composition excellent in balance between mechanical property and heat resistance, by mixing a polystyrene with decarbromodiphenyl ether, octabromodiphenyl ether and an inorganic flame retardant. CONSTITUTION:A resin composition prepared by mixing 100pts.wt. polystyrene resin with 5-25pts.wt. decarbromodiphenyl ether (A), 1-25pts.wt. octa bromodiphenyl ether (B) and 1-15pts.wt. inorganic flame retardant (C), wherein the sum of (A) and (B) used is 6-30pts.wt. The flame-retarding effect attained by the combination of flame retardants A and B can be further increased when it is combined with inorganic flame retardant (C). When the sum of the amounts of flame retardants A and B is smaller than 6pts.wt. the flame retardancy is not sufficient, while when it is larger than 30pts.wt., the mechanical properties and heat resistance of the obtained resin decrease.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a flame-retardant resin composition with an excellent balance of mechanical properties and heat resistance.

In recent years, with the spread of electrical equipment, OA equipment, etc., the amount of flame-retardant polystyrene resin used has rapidly increased. The present invention relates to a flame-retardant resin composition provided for these uses.

[Conventional technology]

Conventionally, various means for making polystyrene resins such as polystyrene and ABS resins flammable have been studied. As flame retardants that can impart relatively high flame retardancy to polystyrene resins and have heat resistance, (4) decabrom diphenyl ether and (B) octabrom diphenyl ether are known. However, the flame retardant (4) above has an extremely high melting point of 300°C to 310°C, and has poor dispersibility in polystyrene resin, which not only deteriorates the mechanical properties of the resin but also deteriorates the appearance of molded products. Because of this, considerably high temperatures must be used during melt cross-fertilization.

However, high-temperature melt cross-conducting is not only disadvantageous in terms of cost, but also has the problem of unavoidable burning of the resin. Furthermore, when a flame retardant (Bl) is used, the appearance of the molded product is good, but it has the drawback that sufficient heat resistance cannot be expected.

[Problem that the invention seeks to solve]

The present invention aims to provide a flame-retardant polystyrene resin composition that gives molded articles a good appearance and has an excellent balance between mechanical properties and heat resistance.

[Means for solving problems]

In the present invention, (A
) 5 to 25 parts by weight of decabromidiphenyl ether, (B
) 1 to 25 parts by weight of octabromidiphenyl ether and 1 to 15 parts by weight of (C1 inorganic flame retardant), and in this case, (Bl) was blended in a ratio such that the total amount thereof was 6 to 30 parts by weight. The present invention relates to a flame-retardant polystyrene resin composition characterized by:

According to the present invention, the amount of added decabromodiphenyl ether (which has a high melting point and poor dispersibility) can be reduced, and the dispersibility can be synergistically improved by using (Bl octabromodiphenyl ether alone). It is possible to obtain a flame-retardant polystyrene-based resin composition with better appearance and mechanical properties of molded articles than in the case of other methods.

Examples of the polystyrene resin used in the present invention include polystyrene, styrene-acrylonitrile copolymer, α-methylstyrene-acrylonitrile copolymer, acrylonitrile-butadiene-styrene copolymer (ABS resin), and the like. These polystyrene resins are produced by conventional suspension polymerization, bulk polymerization, emulsion polymerization, bulk-suspension polymerization, and the like.

The amount of Al decabrom diphenyl ether used in the present invention is 5 to 5 parts by weight per 100 parts by weight of the polystyrene resin.
25 parts by weight, preferably 6 to 20 parts by weight. If the amount added is less than 5 parts by weight, a sufficient flame retardant effect cannot be obtained, and if it exceeds 25 parts by weight, a resin composition with sufficient mechanical properties cannot be obtained, which is not preferable.

In addition, the amount of Bl octapromoxy 722 ether used in the present invention is 1 to 25 parts by weight, preferably 3 to 20 parts by weight, per 100 parts by weight of the polystyrene resin. On the other hand, if the amount exceeds 25 parts by weight, the heat resistance will be impaired, which is not preferable.

The flame retardant effect when the above flame retardants (Al and (Bl) are used together is further enhanced by using (C1 inorganic flame retardant) in combination.

Examples of the inorganic flame retardant include antimony trioxide, antimony pentoxide, and bismuth, with antimony trioxide being preferred.

(C) The amount of inorganic flame retardant added is 10% of polystyrene resin.
The amount is 1 to 15 parts by weight, preferably 2 to 10 parts by weight. If the amount added is less than 1 part by weight, the flame retardance will not be sufficient, and if it is more than 15 parts by weight, the mechanical properties of the polystyrene resin will be impaired, which is not preferable.

In the present invention, (Al decabrom diphenyl nitrate (Bl octabrom diphenyl ether) has a total of 6
~30 parts by weight. If the total addition amount, that is, the blending amount, is less than 6 parts by weight, the flame retardant effect will not be sufficient, and if it exceeds 30 parts by weight, the mechanical properties and heat resistance of the resulting resin will deteriorate.

The flame-retardant polystyrene resin composition of the present invention may contain various additives such as heat stabilizers, lubricants, colorants, and inorganic fillers. The polystyrene resin composition of the present invention thus obtained has high flame retardancy, heat resistance, and mechanical properties, and is useful for various uses such as home appliances and OA equipment.

Example The present invention will be explained in detail below with reference to Examples.

For 100 parts by weight of acrylonitrile-butadiene-styrene copolymer resin "Diabet ■" 7001 (general-purpose ABS resin manufactured by Mitsubishi Rayon Co., Ltd.), flame retardant decabrom diphenyl ether, (Bli retardant octabrom diphenyl ether and Antimony oxide was blended in the proportions shown in the table, and 1 part of diptyltin malate was added to 100 parts by weight of this copolymer resin.

Each of these formulations was mixed in a super mixer at 40 or
The mixture was mixed for 5 minutes at a speed of 30 mm, p6m, and then melt-extruded at 200° C. using a 30 mm diameter vented twin-screw extruder to pelletize. Next, after drying the pellets at 70°C for more than 10 hours, a UL combustion test piece ("
7;; x ``y', 'x5'), Izotsu impact test piece (1/' x 3' x2, s') and Vicat softening temperature test piece (according to the method specified in 3'x→
→It's 4. Izot impact test is ASTM D-256
, Vicat softening temperature test piece is ASTM D-1525
Each was molded according to the following. These results are shown in the table.

In addition, the table also shows cases in which the flame retardant diagram or (B) was used alone as a comparative example. As is clear from the table, the composition of the present invention using flame retardant diagram and CB) in combination,
Compared to the case where the flame retardants (Al and (Bl) are used alone, the impact resistance and heat resistance are better balanced, and the appearance of the molded product is also better.

〔Effect of the invention〕

Patent Applicant Mitsubishi Rayon Co., Ltd. Agent Patent Attorney Toshio Yoshizawa °8.../

Claims (1)

[Claims] For 100 parts by weight of polystyrene resin, (A) 5 to 25 parts by weight of decabromodiphenyl ether, (B) 1 to 25 parts by weight of octabromodiphenyl ether, and (C
) A flame-retardant resin composition characterized in that it contains 1 to 15 parts by weight of an inorganic flame retardant, and in this case, (A) and (B) are blended in a ratio that makes the total of 6 to 30 parts by weight. thing.