JP2000086854A - Glass-fiber-reinforced flame-retardant styrene resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition which can give a product excellent in tensile strength, bending strength, heat resistance, flame retardancy, and light stability by compounding a rubber-reinforced polystyrene resin with a flame retardant selected from a brominated epoxy polymer and a bromine-containing phosphate and glass fiber. SOLUTION: This composition comprises compounding 100 pts.wt. rubber- reinforced polystyrene resin, 15-25 pts.wt. at least either of a brominated epoxy polymer and a bromine-containing phosphate, and 20-40 pts.wt. glass fiber. The rubbery polymer contained in the rubber-reinforced polystyrene resin is desirably a polybutadiene or a styrene/butadiene copolymer. The brominated epoxy polymer is exemplified by a tetrabromobisphenol A epoxy polymer or a tribromophenol-modified tetrabromobisphenol A epoxy polymer. The bromine- containing phosphate is desirably tris(tribromoneopentyl)phosphate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass fiber-reinforced flame-retardant styrene resin composition having excellent rigidity such as tensile strength and bending strength, heat resistance, flame retardancy and light stability.

[0002]

2. Description of the Related Art Conventionally, sheet metal parts of home electric appliances and office equipment, such as chassis and cases, have been replaced with resin parts for the purpose of weight reduction and cost reduction. A resin composition obtained by blending a flame retardant and a glass fiber with an ABS resin has been used because of its excellent rigidity, heat resistance, flame retardancy and light stability.

[0003] The rigidity and heat resistance of a resin composition containing glass fiber as a filler enhancer reflect the rigidity and heat resistance of the resin serving as a matrix. Was low in heat resistance, and the resin composition in which a rubber-reinforced polystyrene resin (hereinafter, referred to as "HIPS resin") was a matrix had further lower rigidity and heat resistance. For this reason, polycarbonate resin or A
A resin composition in which a HIPS resin, which is less expensive than a BS resin, is used as a matrix and glass fibers are blended as a filler, has been desired in terms of economy, but is not satisfactory in terms of performance, and has become popular. It was the current situation that did not lead to.

When a flame retardant is added to a resin, it is common to select a flame retardant that effectively suppresses combustion in accordance with the thermal decomposition behavior of the resin. It has a great effect on the physical properties, especially light stability. Usually, a phosphorus-based flame retardant is used for a polycarbonate resin, whereas a bromine-based flame retardant is most effectively used for an ABS resin and a HIPS resin, but a resin composition containing a brominated flame retardant is used. Was significantly inferior to a resin composition containing a phosphorus-based flame retardant. This also hindered the spread of resin compositions in which a flame retardant and glass fibers were blended with a HIPS resin.

[0005] A resin composition comprising a HIPS resin mixed with a flame retardant and glass fiber is disclosed in JP-A-63-152653.
In the publication, bromine compounds having a bromine content of 40% by weight or more and a melting point of 80 ° C. or more as specific flame retardants (specific examples are decabromodiphenyl oxide, octabromodiphenyl oxide, tetrabromobisphenol A, Tetrabromobisphenol A bis (2,3
-Dibromopropyl) oxide, bis (tribromophenoxy) ethane and tetrabromobisphenol S)
There is disclosed a resin composition that uses a combination of antimony and antimony trioxide. This resin composition was satisfactory in flame retardancy and heat resistance, but was inferior in rigidity and light stability.

Japanese Unexamined Patent Publication (Kokai) No. 63-186750 discloses that a tetrabromobisphenol A.carbonate oligomer and antimony trioxide are used in combination as a flame retardant, and an ultraviolet absorber, an ultraviolet stabilizer and a coloring inhibitor are used as a light discoloration-resistant agent. A resin composition to be used in combination is disclosed. Although this resin composition can satisfy the flame retardancy, heat resistance and light stability performance, it has a light stability which is a light discoloration resistant agent (specific examples include a benzotriazole compound as an ultraviolet absorber, and an ultraviolet light stabilizer). However, since the addition of a hindered amine compound as the agent has solved the problem, there has been a problem of heat coloring and bleeding of the photochromic agent.

[0007]

SUMMARY OF THE INVENTION The present invention
Rigidity such as tensile strength and flexural strength, excellent in heat deformation resistance, flame retardancy of UL94V-0, and heat resistance of the light discoloring agent, which have not been proposed in a resin composition using a PS resin as a matrix, have been proposed. HIPS resin-based glass fiber reinforced hard resin which has excellent light stability without problems of coloring and bleeding and can be used in place of conventional glass fiber reinforced flame-retardant resin composition based on polycarbonate resin or ABS resin A flammable resin composition is provided.

[0008]

The gist of the present invention is to provide a rubber-reinforced polystyrene resin containing 100 parts by weight of 15 to 25 parts by weight of at least one flame retardant selected from a brominated epoxy polymer and a bromine-containing phosphate. Glass fiber 20-4
The present invention relates to a glass fiber reinforced flame retardant styrenic resin composition characterized by containing 0 parts by weight.

[0009]

DETAILED DESCRIPTION OF THE INVENTION The composition of the present invention comprises HIPS, a specific flame retardant and glass fibers. The HIPS resin has a form in which a rubber-like polymer is dispersed in particles in a hard matrix made of an aromatic vinyl polymer. Generally, after dissolving the rubber-like polymer in an aromatic vinyl monomer or a mixture of an aromatic vinyl monomer and an inert solvent, agglomerated under stirring, agglomerated suspension or solution polymerization method. It can be obtained by polymerizing an aromatic vinyl monomer, and precipitating and granulating a rubbery polymer. However,
It is not limited to such a polymerization method. Examples of the aromatic vinyl monomer include styrene, a nuclear-substituted styrene such as p-methylstyrene, and α such as α-methylstyrene.
Substituted styrene is mentioned, and styrene is particularly preferably used. Examples of the rubbery polymer include polybutadiene, styrene / butadiene copolymer, polyisoprene, and styrene / isoprene copolymer. Among them, polybutadiene and styrene / butadiene copolymer are preferably used. The content of the rubbery polymer is usually in the range of 3 to 15% by weight, preferably 6 to 12% by weight. The average particle size of the rubbery polymer is generally in the range of 0.10 to 8.0 µm, preferably 1.0 to 4.0 µm. The degree of swelling of the rubbery polymer is usually in the range of 5 to 25, preferably 10 to 20. The microstructure of the rubbery polymer includes high cis (the 1,4-cis structure is 80% by weight or more),
Low cis (having a 1,4-cis structure of 50% by weight or less) is preferred, and high cis is particularly preferably used.
The weight average molecular weight of the aromatic vinyl polymer is usually 100,
000-300,000, preferably 150,000-
It is in the range of 250,000.

Next, the specific flame retardant to be added to the composition of the present invention is at least one flame retardant selected from brominated epoxy polymers and bromine-containing phosphates. The brominated epoxy polymer refers to an addition polymer of a brominated bisphenol compound and epichlorohydrin, or a brominated bisphenol compound diglycidyl ether. Here, examples of the brominated bisphenol compound include tetrabromobisphenol A, dibromobisphenol A, tetrabromobisphenol F, and tetrabromobisphenol S. The molecular weight of the brominated epoxy polymer ranges from several hundreds to tens of thousands depending on the degree of polymerization (the number of repetitions of the brominated bisphenol compound / 2-hydroxypropane unit). The molecular end of the brominated epoxy polymer may remain an epoxy group or be modified with an aryl group or an alkyl group, and the aryl group or the alkyl group may be substituted with bromine. Examples of the aryl group include a phenyl group, a xylyl group, and a tribromophenyl group, and examples of the alkyl group include a methyl group, an ethyl group, and a tribromoneopentyl group.

Specific examples of the brominated epoxy polymer include tetrabromobisphenol A / epoxy polymer and tribromophenol-modified tetrabromobisphenol A / epoxy polymer. There are many types of these brominated epoxy polymers depending on the degree of polymerization and the degree of modification of the epoxy group, and generally, the higher the degree of polymerization, the higher the heat resistance but the lower the fluidity. The higher the rate, the better the flame retardancy but the poorer the light stability. For example, tetrabromobisphenol A
When a flame retardant having a large degree of polymerization having a molecular weight exceeding 20,000 is blended as an epoxy polymer, a resin composition having particularly excellent rigidity, heat resistance and light stability can be obtained, and tribromophenol-modified tetrabromobisphenol is obtained. A. As an epoxy polymer, if a flame retardant having a moderate degree of epoxy group modification of 50% and a relatively small degree of polymerization of 1,500 to 2,500 in molecular weight is blended, rigidity is high, heat resistance,
A resin composition having a good balance of fluidity, flame retardancy and light stability can be obtained. As the flame retardants of the same type, those having different degrees of polymerization and epoxy group modification can be used in combination as needed.

The term "brominated phosphate" means a compound obtained by reacting a brominated alcohol or a brominated phenol with phosphorus oxychloride. Here, examples of the brominated alcohol include 2,3-dibromopropanol, dibromoneopentyl alcohol, and tribromoneopentyl alcohol, and examples of the brominated phenol include dibromophenol and tribromophenol.
Tris (tribromoneopentyl) in which all bromine is bonded to the primary carbon among these bromine-containing phosphates
Phosphates are particularly preferred because of their excellent flame retardancy and light stability. These flame retardants can be used alone or in combination of two or more. Further, these flame retardants are used in a total of 15 to 25 parts by weight based on 100 parts by weight of the HIPS resin.
It is necessary to mix parts by weight. If the amount is less than 15 parts by weight, the flame retardancy of UL94V-0 cannot be obtained, while if it exceeds 25 parts by weight, heat stability, light stability,
The molding processability and economy are lost, which is not preferable. When a total of 15 to 25 parts by weight of at least one flame retardant selected from a brominated epoxy polymer and a bromine-containing phosphate is blended, 3 to 7 parts by weight of antimony trioxide is used as a flame retardant synergist. preferable.

Further, the composition of the present invention contains glass fibers in addition to the HIPS resin and the specific flame retardant. Glass fibers are commonly used for reinforcing plastics. For example, a glass fiber having an average fiber diameter of 5 to 15 μm, which has been surface-treated with a coupling agent such as a silane-based or titanate-based resin, is treated with a sizing agent such as an epoxy resin for 100 to 10 μm.
This is a so-called glass chopped strand in which 00 pieces are converged and cut into a length of 1 to 10 mm. Glass fiber is
It is necessary to mix 20 to 40 parts by weight with respect to 100 parts by weight of the HIPS resin. If the amount is less than 20 parts by weight, high rigidity and heat resistance cannot be maintained, while if it exceeds 40 parts by weight, productivity and molding processability are lost, which is not preferable.

The glass fiber reinforced flame retardant styrenic resin composition of the present invention can be produced by mixing and melt-kneading these components. First, a HIPS resin and a flame retardant are mixed and melt-kneaded to produce a flame-retardant styrene-based resin, and then mixed and melt-kneaded with this to produce a glass fiber-reinforced flame-retardant styrene-based resin. Or a method of mixing and melt-kneading a HIPS resin and a flame retardant in advance, adding glass fiber in the middle, and further melt-kneading to produce a glass fiber reinforced flame-retardant styrene resin. is there. There is no limitation on the apparatus for mixing and melt-kneading, for example, a Henschel mixer, a tumbler mixer, a Banbury mixer, a pressure kneader,
A single-screw extruder, a twin-screw extruder and the like can be mentioned.

The glass fiber-reinforced flame-retardant styrenic resin composition of the present invention is generally put to practical use by adding an internal lubricant, an external lubricant, a stabilizer, a colorant and the like. If necessary, an antistatic agent, an inorganic filler such as talc or calcium carbonate, or a soft polymer such as an ethylene copolymer or a styrene block copolymer can be added. Further, when a very high light stability is required, an ultraviolet absorber or an ultraviolet stabilizer can be added. The glass fiber reinforced flame retardant styrenic resin composition of the present invention is obtained by injection molding, extrusion molding or vacuum / pressure molding.
It can be used for home appliances and office equipment parts.

[0016]

EXAMPLES The present invention will be specifically described below with reference to examples, reference examples and comparative examples, but the present invention is not limited to the following examples. In addition, the evaluation of each composition of Examples, Reference Examples and Comparative Examples was performed as follows. <Tensile yield value>: JIS-K7113 (Tensile test method)
It measured according to. The tensile test was performed at a speed E. The test piece was a cylinder temperature setting of 200 ° C., an injection speed setting of 80%, and a mold temperature setting of 4 using an injection molding machine of IS90B manufactured by Toshiba Machine Co., Ltd.
It was made by operating at 0 ° C. Further, the percentages of the tensile yield values of the examples and the comparative examples with respect to the tensile yield values of the reference examples in which no glass fiber was contained for each of them were represented by%.

<Bending strength and flexural modulus>: A test piece was prepared in the same manner as the tensile yield value, and measured in accordance with JIS-K7203 (bending test method). Further, the ratio of the bending strength of the examples and the comparative examples to the bending strength of the reference example in which the glass fiber corresponding thereto was not included was expressed by%. <Izod impact value>: A test piece was prepared in the same manner as the tensile yield value, and JIS-K7110 (Izod impact test method)
It measured according to.

<Deflection temperature under load>: A test piece was prepared in the same manner as the tensile yield value, and measured according to JIS-K7207 (load deflection test method). The load deflection temperature test was performed by the A method. Also, the difference between the deflection temperature under load of the example and the comparative example and the deflection temperature under load of the reference example which does not include the glass fiber corresponding to each of them is shown. <Melt flow rate>: Measured according to JIS-K7210 (flow test method). The flow test was performed under condition 8.

<Flame retardancy>: Measured according to UL94V-0 (20 mm vertical combustion test method). The test piece was a VP40 injection molding machine manufactured by Hishiya Seiko Co., Ltd. with a cylinder temperature setting of 200 ° C., an injection speed setting of 45%, and a mold temperature setting of 40 ° C.
Driving with and made. The thickness of the test piece was 2.0 mm. <Light discoloration degree>: The discoloration degree (ΔE ^* ) by the xenon weather meter acceleration test was measured with a color meter. Xenon weather meter accelerated test showed Atlas Ci35 with black panel temperature 63 ° C, 340nm illuminance 0.25W
/ M ² , irradiation time 300 hrs. The specimen is
It was prepared by operating with a cylinder temperature setting of 200 ° C., an injection speed setting of 60%, and a mold temperature setting of 40 ° C. using an FS80 injection molding machine manufactured by Nissei Plastics Co., Ltd.

Example 1 and Reference Example 1 Butadiene rubber having a weight average molecular weight of polystyrene of 218,000, a number average molecular weight of 80,000, a high cis structure, a swelling index of 10.5, and a particle size of 2.8 μm was prepared. HIPS resin containing 10.8% by weight (hereinafter referred to as "HIP resin").
100 parts by weight, average molecular weight of 60,0
A flame retardant comprising tetrabromobisphenol A / epoxy polymer of No. 00 (commercially available from Toto Kasei Co., Ltd. as phenotote YPB43C; hereinafter referred to as “YPB4
3C), 23.0 parts by weight, a flame retardant synergist (commercially available as "antimony trioxide" from Mikuni Refining Co., Ltd.) 4.5 parts by weight, and a dispersant ("NP1500" as Tamnan Chemical Industry Co., Ltd.) 0.5 parts by weight of a stabilizer (a product available from Sumitomo Chemical Co., Ltd. as "Sumilyzer BHT" and a product available from Yoshitomi Pharmaceutical Co., Ltd. as "DSTP Yoshitomi") 0.5 parts by weight and 3.0 parts by weight of a light gray colorant mainly composed of titanium dioxide are weighed, mixed with a tumbler mixer, and melt-kneaded with a twin-screw extruder. After granulation, the composition of Reference Example 1 was obtained. The twin screw extruder is BT40 (screw diameter: φ4) manufactured by Plastic Engineering Laboratory Co., Ltd.
0mm, same direction rotation), cylinder temperature setting 200
It operated at 150 degreeC and screw rotation speed 150rpm.

Next, the granulated composition obtained in Reference Example 1 and 32.0 parts by weight of glass fiber (commercially available from Nippon Glass Fiber Co., Ltd. as "glass chopped strand RES03TP14"), tumbler The components were mixed by a mixer, melt-kneaded and granulated by a single-screw extruder to obtain a composition of Example 1. Single screw extruder manufactured by Isuzu Kakoki Co., Ltd., screw diameter: φ40 mm, cylinder temperature setting 200
The operation was performed at 60 ° C. and a screw rotation speed of 60 rpm. Note that H
The composition of the IPS resin was measured according to the following method. (1) Weight average molecular weight and number average molecular weight of polystyrene Solvent dispersion in methyl ethyl ketone → CR manufactured by Hitachi Koki Co., Ltd.
Centrifugation at 26H → The supernatant was collected, and the weight-average molecular weight and number-average molecular weight were measured with SHODEX SYSTEM11 manufactured by Showa Denko KK.

(2) High cis structure of butadiene rubber Solvent dispersion in methyl ethyl ketone → CR manufactured by Hitachi Koki Co., Ltd.
A thin film was prepared by centrifugation at 26H → collection of a sedimented portion → drying under reduced pressure, and infrared spectroscopy was measured using FT720 manufactured by Horiba, Ltd. 700 cm ^-1 (1,4-cis structure), 910 cm ^-1 (1,2-vinyl structure) and 960
From the peak intensity ratio of cm ^-1 (1,4-trans structure),
The structure was confirmed to be a high cis structure.

(3) Swelling index of butadiene rubber Solvent dispersion in methyl ethyl ketone → CR manufactured by Hitachi Koki Co., Ltd.
Centrifugation at 26H → collection of sedimentation part → swelling with excess toluene → centrifugation with CR26H manufactured by Hitachi Koki Co., Ltd → collection of sedimentation part and measurement of weight. Subsequently, this was dried under reduced pressure and the weight was measured. The swelling index was calculated by weight / weight. (4) Particle Diameter of Butadiene Rubber A 3% by weight solution using dimethylformamide as a solvent was prepared, and the volume average particle diameter was measured with LA700 manufactured by HORIBA, Ltd. (5) Content of butadiene rubber Solvent dispersion in chloroform → Reaction of iodine monochloride with alkene → Back titration with sodium thiosulfate of a solution prepared by reacting potassium iodide with excess iodine monochloride was carried out by Hiranuma Sangyo ( Butadiene content was measured using COMTITE900 manufactured by Co., Ltd.

Example 2 and Reference Example 2 In Example 1 and Reference Example 1, the HIPS resin was
Polystyrene having a weight average molecular weight of 220,000, a number average molecular weight of 81,000, a high cis structure, a swelling index of 10.5, and a particle diameter of 3.2 μm, containing 11.4% by weight of butadiene rubber (hereinafter referred to as “polystyrene”). , "HIPS-2"
), As a flame retardant, the epoxy group modification rate is 50%
Example 1 and Reference Example 1 except that tribromophenol-modified tetrabromobisphenol A / epoxy polymer having an average molecular weight of 1,600 (commercially available from Toto Kasei Co., Ltd. as "Epototo YDB416") was used. A composition was obtained in the same manner as in Example 1. Tables 1 and 2 show the results evaluated by the above-described evaluation methods.

Example 3 and Reference Example 3 In Example 1 and Reference Example 1, "HIPS-2" was used as the HIPS resin, "YPB43C" was used as the flame retardant, 12.0 parts by weight, and the modification ratio of the epoxy group was 100%. 10.0 weight percent of a tribromophenol-modified tetrabromobisphenol A / epoxy polymer having an average molecular weight of 1,400 (available from Toto Kasei Co., Ltd. as "Epototo TB60"; hereinafter, referred to as "TB60"). A composition was obtained in the same manner as in Example 1 and Reference Example 1 except that the composition was changed to parts. Tables 1 and 2 show the results evaluated by the above-described evaluation methods.

Example 4 and Reference Example 4 In Example 1 and Reference Example 1, 12.0 parts by weight of "HIPS-2" as a HIPS resin, "YPB43C" as a flame retardant, and tris (tribromoneopentyl)
Phosphate (commercially available from Daihachi Chemical Industry Co., Ltd. as "CR900". Hereinafter, "CR900"
The composition was obtained in the same manner as in Example 1 and Reference Example 1 except that the composition was changed to 10.0 parts by weight. Tables 1 and 2 show the results evaluated by the above-described evaluation methods.

Comparative Example 1 and Reference Example 5 In Example 1 and Reference Example 1, 15.0 parts by weight of tetrabromodiphenyl oxide (commercially available as "DE83R" from Great Lakes Chemical Corporation) was used as a flame retardant. Otherwise, a composition was obtained in the same manner as in Example 1 and Reference Example 1. Tables 1 and 2 show the results evaluated by the above-described evaluation methods. Comparative Example 2 and Reference Example 6 In Example 1 and Reference Example 1, "HIPS-2" was used as the HIPS resin, and tetrabromobisphenol A was used as the flame retardant ("Seitex RB100" from Albemarle Asano Co., Ltd.). 21.0
A composition was obtained in the same manner as in Example 1 and Reference Example 1, except that the composition was changed to parts by weight. Tables 1 and 2 show the results evaluated by the above-described evaluation methods.

Comparative Example 3 and Reference Example 7 In Example 1 and Reference Example 1, "TB6" was used as the flame retardant.
0 "was replaced with 9.0 parts by weight and 9.0 parts by weight of ethylene bis (pentabromobenzene) (commercially available as" Seitex 8010 "from Albemarle Asano Co., Ltd.). A composition was obtained in the same manner as in Example 1 and Reference Example 1. Tables 1 and 2 show the results evaluated by the above-described evaluation methods.

Comparative Example 4 and Reference Example 8 In Example 1 and Reference Example 1, "TB6" was used as the flame retardant.
0 "and 5.0 parts by weight of ethylene bis (tetrabromophthalimide) (commercially available as" Seitex BT93 "from Albemarle Asano Co., Ltd.) 14.0.
A composition was obtained in the same manner as in Example 1 and Reference Example 1 except that the composition was changed to parts by weight. Tables 1 and 2 show the results evaluated by the above-described evaluation methods.

Comparative Example 5 and Reference Example 9 In Example 1 and Reference Example 1, the HIPS resin was
Polystyrene having a weight average molecular weight of 208.000, a number average molecular weight of 83,000, a high cis structure, a swelling index of 11.1, and a particle diameter of 2.3 μm containing 9.9% by weight of butadiene rubber (hereinafter referred to as “polystyrene”). , “HIPS-3”), 10.0 parts by weight of “CR900” as a flame retardant, and 2,4,6-tris (tribromophenoxy) 1,
3,5-Triazine (commercially available from Dai-ichi Kogyo Seiyaku Co., Ltd. as "Pyroguard SR245") was replaced with 9.0 parts by weight, and the composition was changed in the same manner as in Example 1 and Reference Example 1. I got something. Tables 1 and 2 show the results evaluated by the above-described evaluation methods.

Comparative Example 6 and Reference Example 10 In Example 1 and Comparative Example 1, "YPB" was used as the flame retardant.
A composition was obtained in the same manner as in Example 1 and Reference Example 1, except that "43C" was changed to 10.0 parts by weight. Tables 1 and 2 show the results evaluated by the above-described evaluation methods. Comparative Example 7 and Reference Example 11 In Example 1 and Reference Example 1, except that “HIPS-2” was replaced as the HIPS resin and “YDB416” was replaced with 35.0 parts by weight of the flame retardant as the flame retardant. A composition was obtained in the same manner as in Example 1. Tables 1 and 2 show the results evaluated by the above-described evaluation methods.

[0032]

[Table 1]

[0033]

[Table 2]

[0034]

[Table 3]

[0035]

[Table 4]

The following can be seen from Tables 1 and 2. In Examples 1-4 satisfying the requirements of the present invention, the ratio of the yield to the reference example in the tensile yield value and the bending strength (which indicates the degree of reinforcement of the glass fiber) is 254 to 34.
It is as large as 5%. The deflection temperatures under load all exceeded 90 ° C., and the difference between the examples and the reference examples (which indicates the degree of heat resistance enhancement of the glass fiber) was +15 to +15.
The flame retardancy was as high as + 16 ° C, and all of them passed UL94V-0, and the photochromicity was a small value of 3.2 to 6.3.

Comparative Example 1 contains decabromodiphenyl oxide as a flame retardant.
Although it has passed UL94V-0 for flame retardancy, the degree of heat resistance enhancement of glass fiber is as low as + 13 ° C, the degree of reinforcement of glass fiber rigidity is as small as 162 to 196%, and the photochromic degree is 45. It was extremely large. Comparative Example 2 shows that tetrabromobisphenol A was used as a flame retardant.
As a result, the degree of stiffening of the glass fiber is 238 to 295%, and the flame retardancy is UL94V-.
Although there is no problem in terms of zero, the deflection temperature under load is 87
° C and the photochromic degree was extremely large at 35.

In Comparative Examples 3 to 5, the amounts of the flame retardants satisfying the requirements of the present invention do not satisfy the requirements of the present invention. As a result, in Comparative Example 3, although the flame retardancy was UL94V-0, there was no problem, but the rigidity enhancement degree of the glass fiber was 197 to 21.
It was as small as 8%, the degree of heat resistance enhancement of the glass fiber was slightly low at + 14 ° C, and the photochromic degree was as large as 15. In Comparative Example 4, although the flame retardancy is UL94V-0 and the photochromic degree is 3.2, there is no problem, but the rigidity of the glass fiber is as small as 183 to 215%, and the heat resistance of the glass fiber is also small. The temperature was slightly lower at + 14 ° C. Comparative Example 5
Although the degree of heat resistance enhancement of glass fiber is + 15 ° C. and the flame retardancy is UL94V-0, there is no problem. However, the degree of reinforcement of glass fiber rigidity is extremely small as 154 to 171%, and the degree of photochromic discoloration is as large as 10. Was something.

In Comparative Example 6, the compounding amount of the flame retardant was lower than the requirement of the present invention.
L94V-0 (Table 2 and NC in Table 2).
Is an abbreviation of Not-Classified, 20 mm
Flame burning for more than 30 seconds in the vertical combustion test, V-
0, V-1 or V-2 could not be expressed). In Comparative Example 7, the compounding amount of the flame retardant exceeded the requirement of the present invention, and as a result, the deflection temperature under load was as low as 86 ° C., and the photochromic degree was as large as 11.

[0040]

The glass fiber reinforced flame retardant styrenic resin composition of the present invention has excellent rigidity such as tensile strength and flexural strength, excellent heat deformation resistance, flame resistance of UL94V-0, and light resistance. It shows excellent light stability irrespective of the addition of a color changing agent, and can be used in place of a glass fiber reinforced flame retardant resin composition based on a polycarbonate resin or an ABS resin, and is industrially useful. .

Claims (1)

[Claims] 1. To 100 parts by weight of a rubber-reinforced polystyrene resin, 15 to 25 parts by weight of at least one flame retardant selected from a brominated epoxy polymer and a bromine-containing phosphate and 20 to 40 parts by weight of glass fiber are blended. A glass fiber reinforced flame-retardant styrenic resin composition, characterized in that: