JPS5931539B2 - Flame retardant resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a flame retardant material obtained by adding decabromodiphenyl ether, a halogen flame retardant, magnesium hydroxide, oxide or basic magnesium carbonate, and an ultraviolet absorber to a styrene resin. The present invention relates to a resin composition which also has excellent weather resistance.

Styrenic resins have traditionally had excellent processability, mechanical properties,
It has good electrical properties and a beautiful appearance as a molded product, and is also inexpensive, so it is widely used in household electrical equipment and furniture.

However, styrenic resins are highly flammable and are subject to many restrictions in terms of where they can be used.

10 In recent years, due to the need for fire safety, the demand for flame retardant properties for these styrenic resins has attracted attention, and the U.S. Underwriters and Laboratory Standards (
As the UL standards (hereinafter referred to as UL standards) have been strengthened over the years, there has been a strong demand for 15 flame retardant styrene resins.

In order to impart flame retardancy to such styrenic resins, a series of compounds called flame retardants, such as organic halogen compounds,
Methods of adding flame retardant aids such as ester phosphoric acid compounds, compounds containing both halogen and phosphorus, and antimony trioxide are known, and although it is difficult to make them completely nonflammable, they do slow combustion. It is possible to make it self-extinguishing or self-extinguishing.

However, these methods require an extremely large amount of flame retardant, which results in a uniform decline in weather resistance, and although it can be improved to some extent by adding an ultraviolet 25 ray absorber, particularly severe flame retardance, such as UL The reality is that when applying the standard V-1 and V-O equivalents, it is insufficient and undesirable for light-colored molded products. As described above, it is extremely difficult to provide compositions based on styrene resins with both excellent flame retardancy and weather resistance. The present inventors have developed V-1 and V- according to UL standards without impairing the properties of styrene resin.
In order to obtain excellent flame retardancy and weather resistance equivalent to O, the styrene-based resin is combined with decabromodiphenyl ether, a halogen-based flame retardant, and magnesium hydroxide, oxide, or basic magnesium carbonate. It has been found that the addition of one or more inorganic compounds and an ultraviolet absorber gives very favorable results.

That is, by adding decapromodiphenyl ether, which is a halogen-based flame retardant, flame retardancy is promoted, and a value equivalent to V-1 and V-0 of the UL standard is obtained.

Furthermore, by adding one or more inorganic compounds selected from the group consisting of magnesium hydroxide, oxide, or basic magnesium carbonate, the weather resistance decreased by the addition of the halogen flame retardant can be significantly restored. The present invention will be explained in more detail below.

The styrene resin referred to in the present invention refers to polystyrene and rubber-modified polystyrene (hereinafter referred to as HI polystyrene resin).
), polymethylstyrene, styrene-butadiene copolymer, styrene-acrylonitrile copolymer (hereinafter referred to as AS resin), etc., or a mixture thereof. It also contains a resin composition in which an elastomeric substance such as polybutadiene rubber or styrene-butadiene copolymer rubber is added to the extent that no damage is caused. Decabromodiphenyl ether, a halogen flame retardant used in such styrene resins, is disclosed by M. P. 3OO℃, Br content 81%
Any commercially available brominated flame retardant may be used.

The decapromodiphenyl ether of the present invention can obtain flame retardancy equivalent to UL standards V-1 and V-0 by adding a small amount, and has excellent effects in applications where heat resistance is important such as electrical materials. demonstrate. 3 In the present invention, the quantitative ratio of the styrene resin and the halogenated flame retardant decabromodiphenyl ether is in the range of 11 to 30 parts by weight to 100 parts by weight of the former. That is, if the amount of the halogen flame retardant decapromodiphenyl ether added is less than 11 parts by weight per 100 parts by weight of the styrene resin, the resulting resin composition will not have sufficient flame retardancy.
Furthermore, if more than 30 parts by weight is added, the flame retardance will not improve much, but other physical properties will be impaired. In the present invention, the preferred amount of decapromodiphenyl ether 4 is V-
It is preferable to add 11 to 14 parts by weight to obtain a flame retardance equivalent to 1, and 15 to 30 parts by weight to obtain a flame retardance equivalent to -0.

In the present invention, a good effect can be obtained using a halogen-based flame retardant alone, but flame retardancy can be further improved by using a flame retardant aid such as antimony trioxide or zirconium dioxide in combination. preferable.

If the amount of such flame retardant aid added is less than 1 part by weight per 100 parts by weight of the styrene resin, the flame retardant aid effect will not be sufficient, and if it is added in excess of 10 parts by weight, the flame retardant aid effect will not be sufficient. is not improved any further, and on the contrary, other physical properties may be impaired. Further, the inorganic compounds used in the present invention include magnesium hydroxide, magnesium oxide, and basic magnesium carbonate, and particularly preferred inorganic compounds are magnesium hydroxide and magnesium oxide.
It significantly improves weather resistance.

In the present invention, the quantitative ratio of the styrene resin and one or more inorganic compounds selected from the group consisting of magnesium hydroxide, oxide, or basic magnesium carbonate is such that the latter is 100 parts by weight of the former. A range of 0.1 to 10 parts by weight is suitable.

That is, for 100 parts by weight of styrene resin, 0.1
If it is less than 10 parts by weight, the improvement in weather resistance will be insufficient, and if it is added in excess of 10 parts by weight, weather resistance will deteriorate or other physical properties will be impaired. The ultraviolet absorber used in the present invention may be benzotriazole-based, benzophenone-based, salicylate-based, etc., or any combination thereof, and good effects can be obtained.

For example, in the benzotriazole series, 2-(21-hydroxy-5'-methylphenyl)benzotriazole, 2
-(2'-hydroxy-5'-tert-butylphenyl)benzotriazole, 2-(27-hydroxy-
3',5'-ditertiarybutyrulfenyl)-5-
Examples include chlorobenzotriazole. Examples of the benzophenone type include 2-hydroxy-4-methoxybenzophenone and 2,2'-dihydroxy-14-methoxybenzophenone, and examples of the salicylate type include phenyl salicylate and 4-octylphenyl salicylate.

In the present invention, the amount of the ultraviolet absorber added is suitably in the range of 0.1 to 5 parts by weight. That is, styrene resin 10
If it is less than 0.1 parts by weight, the improvement in weather resistance is insufficient, and if more than 5 parts by weight is added, the improvement in weather resistance will not be further improved, and on the contrary, the flame retardancy will be improved. and other physical properties.

In this way, the combination of one or more inorganic compounds selected from the group consisting of magnesium hydroxide, oxide, or basic magnesium carbonate and an ultraviolet absorber in the flame-retardant resin composition of the present invention This significantly improves the deterioration in weather resistance caused by flame retardants. A combination of V-1 and V-0 compositions that is particularly effective in the present invention is a system of decapromodiphenyl ether, antimony trioxide, magnesium hydroxide or magnesium oxide, and the ultraviolet absorber Tinupin 327 (manufactured by Ciba Geigi). Weather resistance is significantly improved.

The flame retardant resin composition of the present invention contains various additives conventionally used in styrenic resins, such as antioxidants, lubricants,
There is no problem in adding antistatic agents, dyes and pigments as appropriate.

The flame-retardant resin composition of the present invention can be obtained by various methods.

For example, by mixing the above-mentioned styrene resin with a halogen flame retardant, a flame retardant aid, or an additive in a conventional manner, for example, using a mixer such as a lipon blender, a drum blender, a pen shell mixer, or further. It is obtained by melt-kneading using a heated roll, a Benbury mixer, and an extruder. The flame-retardant resin composition of the present invention thus obtained can be easily molded into molded articles of various shapes by conventionally known molding methods, such as injection molding and extrusion molding. The molded product obtained in this manner is far superior to conventional flame-retardant styrene resins in terms of comprehensive properties such as flame retardancy and weather resistance. The usefulness of the present invention will be explained in more detail by Examples below, but the present invention is not limited to these Examples.Example 1 Rubber-modified polystyrene resin beads S-Brite 500H
M beads (manufactured by Nippon Polystyrene), styrene-butadiene copolymer rubber tabrene (manufactured by Asahi Kasei), and Planelon DB
-101 (manufactured by Mitsui Toatsu Fine), antimony trioxide (
(manufactured by Sumitomo Metal Mining), magnesium hydroxide (manufactured by Kyowa Chemical)
, magnesium oxide (manufactured by Hanui Chemicals), basic magnesium carbonate (manufactured by Hansui Chemicals), and Tinupin 327 (manufactured by Ciba-Geigi Co., Ltd.) in the amounts shown in Table 1 were first premixed using an agitating mixer. 40mmφ
The mixture was heated and mixed using an extruder at a cylinder temperature of 200° C. and a screw rotation speed of 40 rpm to form pellets.

The pellets were injection molded using a 3-ounce in-line injection molding machine at a cylinder temperature of 200°C to prepare combustion test pieces and weather-irradiation test pieces, which were used for each test. The results obtained are summarized in Table 1. As is clear from Table 1, when decabromodiphenyl ether, magnesium hydroxide, magnesium oxide or basic magnesium carbonate, and an ultraviolet absorber are added to styrenic resin, weather resistance is significantly improved and flame retardancy is improved. Excellent in

Examples 2-3 Rubber modified polystyrene resin beads Esprite 500H
M beads (manufactured by Nippon Polystyrene), styrene-butadiene copolymer rubber tabrene (manufactured by Asahi Kasei), and Planelon DB-
101 (manufactured by Mitsui Toatsu Fine), antimony trioxide (manufactured by Sumitomo Metal Mining), magnesium hydroxide (manufactured by Kyowa Chemical Co., Ltd.) and Tinupin 327 (manufactured by Ciba-Geigi Co., Ltd.) in the proportions shown in Tables 2 and 3, respectively. The mixtures were mixed in the same manner as in Example 1, and predetermined test pieces were prepared for each test piece.

The obtained results are summarized in Tables 2 to 3.

As is clear from Table 2, weather resistance is improved when the quantitative ratio of styrene resin and magnesium hydroxide is in the range of 0.1 to 10 parts by weight relative to 100 parts by weight of the former. Excellent flammability. Furthermore, as is clear from Table 3, the weather resistance is improved when the quantitative ratio of the styrene resin and the ultraviolet absorber is in the range of 0.1 to 5 parts by weight to 100 parts by weight of the former, It also has excellent flame retardancy.

Claims (1)

[Claims] 1 For 100 parts by weight of styrene resin excluding acrylonitrile-butadiene-styrene copolymer resin, (1
) Halogenated flame retardant decabromodiphenyl ether 1
1 to 30 parts by weight, (2) 0.1 to 10 parts by weight of one or more inorganic compounds selected from the group consisting of magnesium hydroxide, oxide, or basic magnesium carbonate, and (3) ultraviolet rays. A flame-retardant resin composition with excellent weather resistance, which contains 0.1 to 5 parts by weight of an absorbent.