JPH0710943B2 - Flame-retardant styrene resin composition - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant styrene resin composition having excellent flame resistance and impact resistance.

[0002]

2. Description of the Related Art Styrenic resins are widely used for various purposes such as home electric appliances, upholstery and construction materials because they are excellent in processability and physical properties and are inexpensive. However, styrene-based resins are flammable, and are required to have more excellent flame retardancy with the strengthening of various flame retardant regulations. On the other hand, by improving the physical properties of the resin, the mechanical strength is particularly increased, and the weight reduction and resource saving are being studied.

As a method for making a styrene resin flame-retardant, a bromine-containing epoxy polymer and an aromatic bromine compound or an alicyclic chlorine compound are used as a flame retardant.
Further, JP-A-1-182343 discloses that a bromine-containing epoxy polymer, an aromatic bromine compound such as tetrabromobisphenol A, and antimony trioxide are used as flame retardants. It is also known to use alicyclic bromine compounds, aromatic bromine and aliphatic bromine-containing compounds as UL-94 V-2 flame retardants.

[0004]

However, when an aromatic bromine compound and an alicyclic chlorine compound are used together in these flame retardants, the heat resistance to the processing temperature is sufficient, but the thermal decomposition temperature of the compound is high. However, there is a drawback that the flame retardant effect is low.

Further, in the case of an alicyclic bromine compound, or an aromatic bromine- and aliphatic bromine-containing compound, a molding method such as a hot liner method having a long convection time at a high temperature based on low thermal decomposition temperature and resource saving, Problems such as mold resin coloring and mold corrosion due to thermal decomposition of flame retardants occur. Further, when these flame retardants having relatively low thermal decomposition are used, a fire sag phenomenon is likely to occur during combustion and a high flame retardant effect is required. For example, UL
It is not suitable for applications such as -94 V-1 or V-0. Then, this invention makes it a subject to provide the flame-retardant styrene resin composition excellent in the flame resistance and impact resistance which improved the said problem.

[0006]

The present invention is based on 100 parts by weight of a styrene resin, 1 to 24 parts by weight of a compound represented by the following general formula (1), and a bromine-containing epoxy having a molecular weight of 1,000 to 50,000. 1 to 12 parts by weight of a polymer and 0 to 10 parts by weight of antimony trioxide are added, and the total amount of the compound represented by the general formula (1) and the bromine-containing epoxy polymer is 5 to 25 parts by weight. The flame-retardant styrene resin composition is characterized by:

[0007]

[Chemical 2]

The styrene resin used in the present invention is generally called a styrene resin such as a polymer of styrene monomer, α-methylstyrene and a copolymer of styrene monomer. The resin may contain a small amount of a third component such as butadiene, methyl methacrylate, acrylonitrile, brominated styrene, maleic anhydride, and itaconic acid.

The compound represented by the general formula (1) to be mixed with the styrene resin is benzene-1,1 '-(methylidene) bis [3,5-dibromo-4- (2,3-dibromopropyl). ] (Hereinafter, abbreviated as TBA-DBP),
Benzene-1,1 ′-(methylidene) bis [3,5-dibromo-4- (2,3-dibromo-2-methyl-propyl)] (hereinafter abbreviated as TBA-DBMP), benzene-
1,1 ′-(sulfonyl) bis [3,5-dibromo-4
-(2,3-dibromopropyl)] (hereinafter TBS-D
Abbreviated as BP), benzene-1,1 ′-(sulfonyl) bis [3,5-dibromo-4- (2,3-dibromo-2-)
Methyl-propyl)] (hereinafter abbreviated as TBS-DBMP) and the like, and may also be a mixture of two or more thereof.

Next, a bromine-containing epoxy polymer is a polymer obtained by condensation of tetrabromobisphenol A (hereinafter abbreviated as TBA) and epichlorohydrin, and further, tribromophenol, trichlorophenol, pentabromophenol, It is necessary that the polymer is a polymer obtained by reacting phenols such as phenylphenol, tetrabromophenylphenol, octabromophenylphenol and the like and has a molecular weight of 1,000 to 50,000.

Antimony trioxide is usually commercially available.

The mixing ratio of the three components is 100 parts by weight of the styrene resin, and compounds 1 and 2 represented by the general formula (1).
4 parts by weight, 1 to 12 parts by weight of the bromine-containing epoxy polymer and 0 to 10 parts by weight of antimony trioxide, and the total amount of the compound represented by the general formula (1) and the bromine-containing epoxy polymer is 5 to 5 parts by weight. It must be 25 parts by weight. Outside this range, the object of the present invention will not be achieved.

Next, the general formula (1) for the styrene resin is given.
The compound represented by the formula (1), the bromine-containing epoxy polymer and the antimony trioxide may be mixed in any manner, but the compound represented by the general formula (1) may be added to the bromine-containing epoxy polymer and the antimony trioxide. Is preferably added and mixed uniformly, and then blended with the resin.

The molding processing temperature is usually in the range of 200 to 245 ° C. which is the molding processing temperature of styrene resin. If the temperature is less than 200 ° C, the fluidity of the resin decreases, and
At 0 ° C, coloring and decomposition may occur.

[0015]

The present invention exerts a chemical and physical synergistic effect by blending the compound represented by the general formula (1) and a bromine-containing epoxy polymer, and exhibits flame retardancy, heat resistance and impact resistance. A flame-retardant styrene resin composition having excellent properties is made possible.

[0016]

EXAMPLES The following will describe embodiments and effects of the present invention with reference to Examples, but the exemplification is merely for explanation,
It is not intended to limit or limit the inventive idea. In the examples, "parts" and "%" are based on weight.

Embodiment 1. The compound represented by the general formula (1), the bromine-containing epoxy polymer, and antimony trioxide are mixed with a vertical mixer for 3 minutes, and then HI polystyrene resin (Estyrene H65; Nippon Steel Chemical Co., Ltd.) is added, and 20m inside diameter mixed and adjusted to 220 ℃
After kneading with an extruder of / mφ, it was extruded from a die having a diameter of 3 m / mφ. The obtained strand was cut into a flame-retardant pellet.

A test piece was obtained by injection-molding the obtained flame-retardant pellets using an injection molding machine whose temperature was adjusted to 230 ° C. Flame retardancy and physical properties were measured using this test piece. In addition, after being retained for 20 minutes in an injection molding machine whose temperature was adjusted to 230 ° C., injection molding was restarted, a test piece after retention was taken, and a change in color tone with the test piece before retention was measured. The results are shown in Tables 1 and 2 below.

[0019]

[Table 1]

However, the items in the table have the following meanings.
* A bromine-containing epoxy polymer obtained by reacting tribromophenol with a condensate of TBA and epichlorohydrin. ** Bromine-containing epoxy polymer obtained by condensing TBA and epichlorohydrin. 1) After being retained at 230 ° C. for 20 minutes with an injection molding machine, the change in color tone was measured with a color difference meter. 2) Performed according to UL-94 (1/8 inch). 3), 4) It carried out according to JIS-6871. 5) Use the test piece obtained with a fade meter (63
After irradiation for 24 hours, the change in color tone was measured with a color difference meter. same as below,

[0021]

[Table 2]

[0022]

As described and demonstrated above, the present invention provides a heat-resistant material with little heat deterioration without fear of mold corrosion at general working temperatures such as injection molding, extrusion molding or rolling of styrene resin. It is possible to provide a flame-retardant styrene-based resin that gives a molded product having a light and light resistance.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // (C08L 25/04 63:00) (C08L 51/04 71:00) (C08L 55/02 71:00)

Claims (1)

[Claims] 1. To 100 parts by weight of a styrene resin, 1 to 24 parts by weight of a compound represented by the following general formula (1) and 1 to 1 part of a bromine-containing epoxy polymer having a molecular weight of 1,000 to 50,000.
12 parts by weight and 0-10 parts by weight of antimony trioxide are added, and the total amount of the compound represented by the general formula (1) and the bromine-containing epoxy polymer is 5 to 25 parts by weight. A flame-retardant styrene resin composition characterized. [Chemical 1]