JP2023007873A - Styrene-based flame-retardant resin composition, and molded article thereof - Google Patents

Abstract

To provide a styrene-based flame-retardant resin composition that has impact resistance and fire retardancy and also has improved light resistance, and a molded article thereof.SOLUTION: A styrene-based flame-retardant resin composition contains a rubber-modified styrene-based resin and a bromine-based organic flame retardant. Both of desired fire retardancy and impact resistance and high light resistance are achieved by blending a specific bromine-based compound and a thermoplastic resin of a specific viscosity range. The resin composition is preferably used even for OA devices, electrical appliances, or the like used in an environment exposed to light regardless of indoor light or outdoor light.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to a styrenic flame-retardant resin composition and a molded article using the composition.

Rubber-modified styrenic resins are used in a wide range of applications, especially flame-retardant resins such as office automation equipment such as word processors, personal computers, printers and copiers, home electric appliances such as televisions, VTRs and audio equipment. Used in many fields. Conventionally, various flame retardants have been proposed for imparting flame retardancy to styrenic resins, and among them, halogen-containing organic compounds, which are inexpensive and have an excellent balance of physical properties, are often used. However, in recent years, with the spread of computers and OA equipment, the demand for styrene resins is not limited to conventional flame retardancy and impact resistance, but further light resistance against natural light, fluorescent lamps, LED lamps, etc. is required. has become

Patent Documents 1 and 2 disclose styrene-based flame-retardant resin compositions having high flame retardancy and impact strength as well as excellent light resistance. However, it was not sufficient to obtain the desired flame retardancy and the like.

JP 2006-199925 A Japanese Patent Application Publication No. 2016-003241

An object of the present invention is to provide a styrenic flame-retardant resin composition having impact resistance, heat resistance, flame resistance, and even better light resistance, and a molded product thereof.

As a result of intensive research to solve these problems, the present inventors have found that a styrenic flame-retardant resin composition containing a rubber-modified styrenic resin and a brominated organic flame retardant, a specific brominated compound, and a specific The present inventors have found that desired flame retardancy, impact resistance, and heat resistance can be obtained and high light resistance can be achieved at the same time by combining and blending thermoplastic resins within the viscosity range, and have arrived at the present invention.

That is, the present invention is as follows.
1. (A) With respect to 100 parts by mass of rubber-modified styrene resin, (B) (B-1) a yellow bromine-based compound as a flame retardant and (B-2) a bromine-based compound having a melting point of 100 ° C. or higher and 300 ° C. or lower (B) a flame retardant with a total of 7 parts by mass or more and 14 parts by mass or less including two types of compounds, (C) 0.5 parts by mass or more and 5.5 parts by mass or less of a flame retardant aid, A styrenic flame-retardant resin composition that contains 5 parts by mass or more and 20 parts by mass or less of a thermoplastic resin having a melt viscosity of 500 Pa·s or more and 2000 Pa·s or less at °C and that achieves V-2 according to the UL94 standard.

2. 2. The styrenic flame-retardant resin composition according to 1 above, wherein the yellowness index YI of (B-1) is 10 or more and 65 or less.

3. Styrenic flame retardant according to 1 or 2 above, wherein the mass part ratio (B-1) / (B-2) of (B-1) and (B-2) is 1 or more and 3 or less resin composition

4. 4. The styrenic flame-retardant resin composition according to any one of 1 to 3 above, further comprising (E) an ultraviolet absorber of 0.1 parts by mass or more and 1.5 parts by mass or less.

5. (E) The styrene-based flame-retardant resin according to 4 above, wherein the ratio of the integral value of absorbance at 350 to 400 nm to the integral value of absorbance at 250 to 400 nm of the ultraviolet absorber is 20% or more. Composition

6. 6. The styrene-based flame-retardant resin composition according to any one of 1 to 5 above, which has a deflection temperature under load of 70° C. or higher.

7. 7. The styrene-based flame-retardant resin composition according to any one of 1 to 6 above, which does not contain talc.

8. 8. A molded article obtained by molding the styrene-based flame-retardant resin composition according to any one of 1 to 7 above.

The resin composition of the present invention is a styrenic flame-retardant resin composition having excellent light resistance, impact resistance, heat resistance and flame retardancy. Therefore, the resin composition of the present invention can be suitably used for applications such as OA equipment and home electric appliances that are used in an environment exposed to light regardless of whether it is indoor light or outdoor light.

The resin composition of the present invention will be described in detail below.

First, (A) the rubber-modified styrenic resin will be described. The (A) rubber-modified styrenic resin used in the present invention is obtained by adding a rubber-like polymer to a polymerized aromatic vinyl compound-based monomer for rubber modification. As the polymerization method, it can be produced by a known method such as a bulk polymerization method, a bulk/suspension two-stage polymerization method, a solution polymerization method, or the like. As the aromatic vinyl compound-based monomer, known monomers such as styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene and p-methylstyrene can be used, but styrene is preferred. In addition, monomers other than styrene-based monomers such as acrylonitrile, (meth)acrylic acid, and (meth)acrylic acid esters copolymerizable with these aromatic vinyl compound-based monomers, and maleic anhydride, Any amount that does not impair the performance of the resin composition may be used. Furthermore, in the present invention, a polymer obtained by adding a cross-linking agent such as divinylbenzene to a styrene monomer may be used.

The rubber-like polymer used for rubber modification of (A) the rubber-modified styrene resin of the present invention includes polybutadiene, random or block copolymers of styrene-butadiene, polyisoprene, polychloroprene, random and block copolymers of styrene-isoprene. Alternatively, graft copolymers, ethylene-propylene rubbers, ethylene-propylene-diene rubbers, and the like can be mentioned, but random, block or graft copolymers of polybutadiene and styrene-butadiene are particularly preferred. Also, these may be partially hydrogenated.

Examples of such (A) rubber-modified styrenic resins include high-impact polystyrene (HIPS), ABS resin (acrylonitrile-butadiene-styrene copolymer), AAS resin (acrylonitrile-acrylic rubber-styrene copolymer), Examples include AES resin (acrylonitrile-ethylene propylene-styrene copolymer), MBS resin (methyl methacrylate-butadiene-styrene copolymer), etc. HIPS is preferred.

(A) The molecular weight of the aromatic vinyl polymer in the rubber-modified styrenic resin is not particularly limited, but the reduced viscosity (ηsp/C) is preferably 0.5 dl/g or more and 1.0 dl/g or less. When it is 0.5 dl/g or more, the molten strand of the resin is less likely to break, which is advantageous for stable production.

(A) The content of the rubber-like polymer in the rubber-modified styrenic resin is not particularly limited, but is preferably 3% by mass or more and 10% by mass or less. When the content of the rubber-like polymer is within this range, the impact resistance and rigidity of the molded article are well balanced.

(A) The amount of methanol-soluble components in the rubber-modified styrenic resin is preferably 0.5% by mass or more and 3.0% by mass or less. When the amount of methanol-soluble components is within this range, the heat resistance, toughness, and impact resistance are well balanced.

Next, (B-1) the yellow brominated compound will be described. It suffices to visually perceive that the color has a yellow tint, and the general names of colors classified as yellow include yellow, pale yellow, yellow-orange, gold, and the like. In addition, there are other Japanese names such as lemon color, sulfur color, bright yellow color, sunflower color, rape flower color, turmeric color, mandarin orange color, dandelion color, and ginkgo color. As for the environment for visual judgment, judgment may be made under conditions conforming to the light source and booth described in JIS K 5600-4-3, for example, but these are not particularly limited.

(B-1) used in the present invention preferably has a yellowness YI of 10-65. When the YI is in this range, the light resistance is good. A preferred range is 13-50, more preferably 15-40. A method for measuring YI will be described in Examples.

Also, the melting point of (B-1) is preferably 300° C. or higher. Since it is 300° C. or higher, it exists in a solid state near the processing temperature. Since it is dispersed as a solid when it is made into a composition, it scatters irradiated light when exposed to light, and has good light resistance. The shape may be, for example, any of oil, varnish, gum, powder, pellet, and flake.

Commercially available brominated compounds satisfying these conditions include SR-T1000, SR-T2000, SR-T3040, SR-T7040, SR-T5000, SR-T9000, SR-T20000 and Daiichi Kogyo manufactured by Sakamoto Yakuhin Kogyo Co., Ltd. Examples thereof include SR-460B manufactured by Pharmaceutical Co., Ltd., hexabromobenzene manufactured by Nippo Chemical Co., Ltd., decabromodiphenyl ether manufactured by Tokyo Kasei Kogyo Co., Ltd., SAYTEX BT93 manufactured by Albemarle Co., Ltd., and the like. Among these, SAYTEX BT-93 manufactured by Albemarle is preferable.

Next, the (B-2) brominated compound having a melting point of 100° C. or higher and 300° C. or lower will be explained. Since the melting point is 300° C. or less, it is a liquid at a temperature near the temperature at which combustion starts, so that it imparts fluidity to the resin composition when a combustion test is performed. Therefore, it contributes to passing the V-2 class in the UL94 standard. When the temperature is 100° C. or higher, it is solid within the temperature range in which it is normally used continuously, so that the resin composition has good heat resistance. It is more preferably 150° C. or higher and 280° C. or lower, and still more preferably 200° C. or higher and 260° C. or lower.

Examples of the (B-2) brominated compound having a melting point of 100° C. or higher and 300° C. or lower used in the present invention include brominated triazine-based compounds and brominated bisphenol ether-based compounds.

Pyroguard SR-130, SR-245, SR-720N and the like manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd. are commercially available products satisfying such a structure. Among these, Pyroguard SR-245 is preferable from the viewpoint of achieving both heat resistance and flame retardancy.

The amount of (B) to be added is 7 parts by mass or more and 14 parts by mass or less with respect to 100 parts by mass of the rubber-modified styrenic resin (A). When the amount is 7 parts by mass or more, self-extinguishing properties are obtained, and when the amount is 14 parts by mass or less, good impact resistance is exhibited.

The weight part ratio (B-1)/(B-2) of (B-1) and (B-2) is preferably 1 or more and 3 or less. Within this range, the balance between light resistance and flame retardancy is better, which is preferable.

Next, the (C) flame retardant aid will be described. The flame retardant aid (C) used in the present invention functions to further enhance the flame retardant effect of the brominated flame retardant (B). Antimony oxide such as sodium phosphate, boron compounds such as zinc borate, barium metaborate, anhydrous zinc borate and boric acid anhydride, tin compounds such as zinc stannate and zinc hydroxystannate, molybdenum oxide, ammonium molybdate, etc. molybdenum-based compounds, zirconium-based compounds such as zirconium oxide and zirconium hydroxide, and zinc-based compounds such as zinc sulfide. Among them, it is preferable to use antimony trioxide.

(C) The amount of the flame retardant auxiliary added is 0.5 parts by mass or more and 5.5 parts by mass or less with respect to 100 parts by mass of the rubber-modified styrenic resin (A). Within this range, it is possible to satisfy the balance between flame retardancy and impact resistance.

Next, (D) a thermoplastic resin having a melt viscosity at 200° C. of 500 Pa·s or more and 2000 Pa·s or less will be described. When the melt viscosity is within this range, both impact resistance and dripping property during a combustion test can be achieved in a well-balanced manner. A method for measuring the melt viscosity in the present invention will be described in Examples.

In addition, (D) must be able to measure the melt viscosity at 200 ° C, so general-purpose plastics such as polyethylene, polypropylene, polyvinyl chloride or styrene resins, acrylic resins, and some engineering plastics such as polyacetal and polyester is included. Engineering plastics such as polyamide, polycarbonate, and polyphenylene ether that do not melt at 200° C., and super engineering plastics such as polyphenylene sulfide, Teflon (registered trademark), polyether sulfone, polyether ether ketone, polyimide, and liquid crystal polymer are not included.

Of these, from the viewpoint of compatibility with (A) the rubber-modified styrene resin, preferred are those obtained by polymerizing styrene resins, in other words, aromatic vinyl compound monomers. As the polymerization method, it can be produced by a known method such as a bulk polymerization method, a bulk/suspension two-stage polymerization method, a solution polymerization method, or the like. As the aromatic vinyl compound-based monomer, known monomers such as styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene and p-methylstyrene can be used, but styrene is preferred. In addition, monomers other than styrene-based monomers such as acrylonitrile, (meth)acrylic acid, and (meth)acrylic acid esters copolymerizable with these aromatic vinyl compound-based monomers, and maleic anhydride, Any amount may be used as long as it does not impair the performance of the resin composition. Furthermore, in the present invention, a polymer obtained by adding a cross-linking agent such as divinylbenzene to a styrene monomer may be used.

Examples of such styrenic resins include polystyrene (GPPS), AS resin (acrylonitrile-styrene copolymer), MS resin (methyl methacrylate-styrene copolymer), and the like. Among these, polystyrene (GPPS) is preferred because of its high compatibility with rubber-modified styrenic resins.

The amount of (D) added is 5 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the rubber-modified styrenic resin (A). Within this range, it is possible to satisfy the balance between flame retardancy and impact resistance.

Next, (E) the ultraviolet absorber will be described. The resin composition of the present invention preferably contains an ultraviolet absorber as the component (E). Examples of component (E) include 2-hydroxybenzophenones such as 2,4-dihydroxybenzophenone and 5,5′-methylenebis(2-hydroxy-4-methoxybenzophenone); 2-(2-hydroxy-5-methyl phenyl)benzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-( 2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,5-dicumylphenyl)benzotriazole, 2,2′-methylenebis(4-tert -octyl-6-benzotriazolylphenol), polyethylene glycol ester of 2-(2-hydroxy-3-tert-butyl-5-carboxyphenyl)benzotriazole, 2-[2-hydroxy-3-(2-acryloyl oxyethyl)-5-methylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-tert-butylphenyl]benzotriazole, 2-[2-hydroxy-3-(2 -methacryloyloxyethyl)-5-tert-octylphenyl]benzotriazole, 2-[2-hydroxy-3-(2-methacryloyloxyethyl)-5-tert-butylphenyl]-5-chlorobenzotriazole, 2-[ 2-hydroxy-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, 2-[2-hydroxy-3-tert-butyl-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, 2-[2- Hydroxy-3-tert-amyl-5-(2-methacryloyloxyethyl)phenyl]benzotriazole, 2-[2-hydroxy-3-tert-butyl-5-(3-methacryloyloxypropyl)phenyl]-5-chloro benzotriazole, 2-[2-hydroxy-4-(2-methacryloyloxymethyl)phenyl]benzotriazole, 2-[2-hydroxy-4-(3-methacryloyloxy-2-hydroxypropyl)phenyl]benzotriazole, 2 - 2-(2-hydroxyphenyl)benzotriazoles such as [2-hydroxy-4-(3-methacryloyloxypropyl)phenyl]benzotriazole; phenyl salicylate, resorcinol monobenzoate, 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate, octyl (3,5-di-tert-butyl-4-hydroxy)benzoate , dodecyl (3,5-di-tert-butyl-4-hydroxy)benzoate, tetradecyl (3,5-di-tert-butyl-4-hydroxy)benzoate, hexadecyl (3,5-di-tert-butyl-4 -hydroxy)benzoate, octadecyl (3,5-di-tert-butyl-4-hydroxy)benzoate, behenyl (3,5-di-tert-butyl-4-hydroxy)benzoate; 2-ethyl-2 substituted oxanilides such as '-ethoxyoxanilide, 2-ethoxy-4'-dodecyloxanilide; ethyl-α-cyano-β,β-diphenylacrylate, methyl-2-cyano-3-methyl-3-( cyanoacrylates such as p-methoxyphenyl)acrylate; various metal salts or metal chelates, especially nickel, chromium salts or chelates; Among these, benzotriazole-based UV absorbers are particularly preferred.

In addition, it is preferable that the ratio of the integral value of absorbance at 350 to 400 nm to the integral value of absorbance at 250 to 400 nm of (E) ultraviolet absorber is 20% or more. Within this range, the light resistance is higher.

(E) The preferable addition amount of the ultraviolet absorber is 0.1 parts by mass or more and 1.5 parts by mass or less with respect to 100 parts by mass of the rubber-modified styrenic resin (A). By being within this range, it is possible to achieve both light resistance and impact resistance in a well-balanced manner.

The resin composition of the present invention preferably has a deflection temperature under load of 70° C. or higher. Wider application range when used in applications such as OA equipment and home electric appliances.

Preferably, the resin composition of the present invention does not contain talc. Since it does not contain talc, it has good dripping properties during the combustion test.

Other additives, such as plasticizers, spreading agents, solvents, UV absorbers, antioxidants, anti-aging agents, light stabilizers, stabilizers, antistatic agents, colorants, as long as the objects of the present invention are not impaired. Dyes and pigments, fillers, anti-coloring agents, reinforcing agents, compatibilizers, crystallization accelerators, flame retardants, flame retardant aids, and the like can be added.

The method of adding these is not particularly limited, and they may be added by a known method. For example, (A) a method of adding raw materials during production of the rubber-modified styrenic resin, a polymerization step, and a finishing step, or a method of adding during the step of mixing the resin composition using an extruder or molding machine. can be applied.

Next, a method for producing the resin composition of the present invention will be described.

The method for mixing the resin composition of the present invention is not particularly limited, and known mixing techniques can be applied. For example, using a mixing device such as a mixer-type mixer, a V-type blender, and a tumbler-type mixer, various raw materials are mixed in advance, and the mixture is melt-kneaded to produce a uniform resin composition. can do The melt-kneading device is also not particularly limited, but examples thereof include Banbury mixers, kneaders, rolls, single-screw extruders, special single-screw extruders, and twin-screw extruders. Furthermore, there is also a method of separately adding other additives from the middle of a melt-kneading device such as an extruder.

The molding method for obtaining a molded article from the resin composition of the present invention is not particularly limited. Known molding methods such as extrusion molding such as pneumatic molding and injection molding such as injection molding, RIM molding and injection foam molding can be suitably used, but injection molding and sheet molding are preferred.

EXAMPLES The present invention will be described in detail below with reference to Examples and Comparative Examples, but the present invention is not limited to these.

Materials used in Examples and Comparative Examples are as follows.
(A-1) Rubber-modified styrene resin (rubber-like polymer polybutadiene rubber, reduced viscosity 0.70 dl/g, rubber-like polymer content 9.5% by mass, methanol-soluble component content 1% by mass)
(A-2) Rubber-modified styrene resin (rubber-like polymer polybutadiene rubber, reduced viscosity 0.75 dl/g, rubber-like polymer content 9.5% by mass, methanol-soluble component content 3.5% by mass)
(B-1-a) Bromine compound trade name “Saytex BT-93” (melting point 460° C., yellow powder, YI 30, manufactured by Albemarle)
(B-1-b) Bromine compound trade name “Saytex BT-93W” (melting point 460° C., white powder, YI 7, manufactured by Albemarle)
(B-2-a) Bromine compound trade name "Pyroguard SR-245" (melting point 230 ° C., white powder, manufactured by Daiichi Kogyo Seiyaku Co., Ltd. (B-2-b) Bromine compound trade name "Pyroguard SR-720N" (melting point 110°C, white powder, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.)
(B-2-c) Bromine-based compound trade name "Sayetx 8010" (melting point 350 ° C., white powder, manufactured by Albemarle (C) flame retardant aid trade name "AT-3CN" (manufactured by Suzuhiro Chemical Co., Ltd.)
(D-1) Polystyrene (GPPS, melt viscosity 500 Pa s)
(D-2) Polystyrene (GPPS, melt viscosity 1500 Pa s)
(D-3) Polystyrene (GPPS, melt viscosity 3000 Pa s)
(D-4) polyethylene (PE, melt viscosity 10 Pa s)
(E-1) Ultraviolet absorber trade name “ADEKA STAB LA-36” (350-400 nm absorbance 34%)
(E-2) UV absorber trade name “ADEKA STAB LA-32” (350-400 nm absorbance 19%)
(Talc) FH108 manufactured by Fuji Talc Kogyo Co., Ltd. (average particle size 7 μm)

(A) Measurement of the reduced viscosity (ηsp/C) of the styrene-based resin was performed by adding a mixed solvent of 17.5 ml of methyl ethyl ketone and 17.5 ml of acetone to 1 g of (A) styrene-based resin and dissolving it by shaking at a temperature of 25°C for 2 hours. After that, the insoluble matter was sedimented by centrifugation, the supernatant was taken out by decantation, 250 ml of methanol was added to precipitate the resinous matter, and the insoluble matter was filtered and dried. A sample solution having a polymer concentration of 0.4% (mass/volume) was prepared by dissolving the resin content obtained by the same operation in toluene. This sample solution and pure toluene were measured for solution flow-down seconds with a Ubbelohde viscometer at a constant temperature of 30° C., and calculated by the following formula.
ηsp/C=(t1/t0−1)/C
t0: seconds of pure toluene flowing down
t1: number of seconds for the sample solution to flow down
C: polymer concentration

The content of the rubber-like polymer was measured by dissolving the rubber-modified styrene resin in chloroform, adding a certain amount of iodine monochloride/glacial acetic acid solution, and leaving it in a dark place for about 30 minutes. and 50 ml of pure water were added, excess iodine monochloride was titrated with 0.1N sodium thiosulfate solution, and the amount of iodine monochloride added was calculated.

Measurement of the amount of methanol-soluble components: A sample was dissolved in a solvent, polystyrene was reprecipitated with 10 times the amount of poor solvent, the mass of the reprecipitated polystyrene was determined, and the residue was used as the amount of methanol-soluble components.
Measurement conditions Sample amount: 1 g, solvent: MEK 40 ml, poor solvent: methanol 400 ml

YI: An ultraviolet-visible spectrophotometer V-670 manufactured by JASCO Corporation equipped with an integrating sphere unit ILN-725 was used. Measurement was performed in a reflection mode using a powder sample holder PSH-001, and the obtained results were analyzed with color diagnosis software VWCD-790 manufactured by the same company to determine the yellowness index YI.

Melt viscosity: AR2000ex manufactured by TA Instruments was used as an analyzer. Using a parallel plate with a diameter of 25 mm, a frequency of 1 Hz and a gap of 0.75 mm were used, and a sample of about 0.3 g was used for measurement. The obtained pellets were set, melted at 250°C, and then measured while the temperature was lowered to 150°C.

〔Combustion quality〕
A test piece for evaluating combustibility was molded into a combustion test piece of 127×12.7×2.0 mm using an injection molding machine (manufactured by Japan Steel Works, Ltd., J100E-P). A combustion test was conducted according to the vertical combustion test method (UL94) of Subject No. 94 of Underwriters Laboratories, USA. In this test method, if the evaluation is V-2 or higher, it is accepted, and if it is less than V-2, it is rejected.

[Charpy impact strength]
After drying the obtained pellets by heating at a temperature of 80 ° C. for 3 hours, an A-type test piece (dumbbell) described in JIS K 7139 is molded with an injection molding machine (manufactured by Japan Steel Works, Ltd., J100E-P). bottom. At this time, the cylinder temperature was 205°C and the mold temperature was 45°C.
Measurement was performed based on JIS K 7111-1 using a test piece cut from the central portion of the above dumbbell piece and having a notch (type A, r = 0.25 mm) cut. If the strength is less than 6 KJ/m2, the strength of the molded product is insufficient, and if it is 6 KJ/m2 or more, it is accepted.

[Accelerated light fastness test]
After drying the obtained pellets by heating at a temperature of 80° C. for 20 hours, an injection molding machine (Ti-80G2 manufactured by Toyo Kikai Kinzoku Co., Ltd.) was used to mold a three-stage plate of 90×45 mm in length and width and 1 to 3 mm in thickness. At that time, the cylinder temperature was 215 ° C. and the mold temperature was 45 ° C. The obtained test piece was cut into a size that can be set in a predetermined holder, and a xenon light resistance accelerated tester (Atlas Ci4000) was used, and the black panel temperature was 55 ° C. Irradiation was performed under the conditions of a relative humidity of 55% and a spectral irradiance of 0.3 W/m2/nm at 340 nm, and the specimen was taken out 300 hours after the start of the test.
[ΔE value]
Each value of L*, a*, and b* of the test piece before and after the accelerated light fastness test was measured using a spectral colorimeter SE 7700 manufactured by Nippon Denshoku Industries Co., Ltd. At this time, the light source was D65, the viewing angle was 10°, and the measured value was the value excluding specularly reflected light.
A ΔE value (color difference) was calculated by the following formula.
[Formula] ΔE=√(L* ₁ -L* ₂ ) ²⁺ (a* ₁ -a* ₂ ) ²⁺ (b* ₁ -b* ₂ ) ²
Here, L* ₁ , a* ₁ and b* ₁ are the measured values of the test piece before light irradiation, and L* ₂ , a* ₂ and b* ₂ are the measured values of the test piece after light irradiation. be.
If ΔE before and after 300 hours of irradiation was 5 or more, the light resistance of the molded product was insufficient, and less than 5 was considered acceptable.

[Deflection temperature under load]
The obtained pellets were dried by heating at a temperature of 80° C. for 3 hours, and then molded into a size of 80 mm×10 mm×4 mmt with an injection molding machine (J100E-P manufactured by Japan Steel Works, Ltd.). At this time, the cylinder temperature was 205°C and the mold temperature was 45°C. Yasuda Seiki Thermal Deformation Temperature Measuring Instrument NO. 148 HDPC-3 Heat Distortion Tester was used and measured according to JIS K 7191. The load was 1.8 MPa.

Next, a method for preparing the styrenic flame-retardant resin composition of the present invention will be described.
Examples 1 to 15: (A) to (E) and talc were premixed in the amounts shown in Table 1, supplied to a twin-screw extruder (manufactured by Toshiba Machine Co., Ltd., TEM26SS) to form strands, and cooled with water. It was led to a pelletizer and pelletized.

Comparative Examples 1 to 12: The same operation as in Examples was performed using the blending amounts of (A) to (C) and (D) shown in Table 2.

※はグローイングでＮＧであった。

* indicates NG due to glowing.

It can be seen from the examples in Table 1 that the resin composition of the present invention has excellent flame retardancy and high impact resistance and light resistance. On the other hand, it can be seen from the comparative examples in Table 2 that resin compositions that do not satisfy the requirements of the present invention are inferior in either flame retardancy, impact resistance, or light resistance.

Claims (8)

(A) With respect to 100 parts by mass of rubber-modified styrene resin, (B) (B-1) a yellow bromine-based compound as a flame retardant and (B-2) a bromine-based compound having a melting point of 100 ° C. or higher and 300 ° C. or lower (B) a flame retardant with a total of 7 parts by mass or more and 14 parts by mass or less, (C) 0.5 parts by mass or more and 5.5 parts by mass or less of a flame retardant aid, and (D) A styrenic flame-retardant resin composition that contains 5 parts by mass or more and 20 parts by mass or less of a thermoplastic resin having a melt viscosity of 500 Pa·s or more and 2000 Pa·s or less at 200° C., and achieves V-2 according to the UL94 standard.
The styrenic flame-retardant resin composition according to claim 1, wherein the yellowness YI of (B-1) is 10 or more and 65 or less.
The styrene flame retardant according to claim 1 or 2, wherein the mass part ratio (B-1)/(B-2) of (B-1) and (B-2) is 1 or more and 3 or less. elastic resin composition
The styrenic flame-retardant resin composition according to any one of claims 1 to 3, further comprising (E) an ultraviolet absorber of 0.1 parts by mass or more and 1.5 parts by mass or less.
(E) The styrene-based flame-retardant resin according to claim 4, wherein the ratio of the integral value of absorbance at 350 to 400 nm to the integral value of absorbance at 250 to 400 nm of the ultraviolet absorber is 20% or more. Composition
The styrene flame-retardant resin composition according to any one of claims 1 to 5, which has a deflection temperature under load of 70°C or higher.
The styrenic flame-retardant resin composition according to any one of claims 1 to 6, which does not contain talc.
A molded article obtained by molding the styrene-based flame-retardant resin composition according to any one of claims 1 to 7.