JP2020050809A - Flame-retardant resin composition and molded body - Google Patents

Abstract

To provide a flame-retardant resin composition capable of suppressing content of antimony and providing a molded body excellent in flame retardancy, and a molded body.SOLUTION: There is provided a flame-retardant resin composition containing following (A) component to (D) component, and practically no antimony, and having content of the (A) component of 39.5 mass% to 98.5 mass% based on total 100 mass% of contents of the (A) component to (C) component, content of the (B) component of 1 mass% to 60 mass% based on total 100 mass% of contents of the (A) component to (C) component, content of the (C) component of 0.5 mass% to 20 mass% based on total 100 mass% of contents of the (A) component to (C) component, and content of the (D) component of 0.01 pts.mass to 3.0 pts.mass based on total 100 pts.mass of contents of the (A) component to (C) component. (A) A polyolefin. (B) A natural inorganic filler. (C) A flame retardant. (D) A radical generator.SELECTED DRAWING: None

Description

  The present invention relates to a flame-retardant resin composition and a molded article.

  Polyolefins are used in a wide range of fields as molding materials due to their excellent properties. However, since they are flammable, they are often required to have flame retardancy for use as industrial materials.

  Compositions in which an antimony compound is added to polyolefin for the purpose of flame retardancy are known (for example, Patent Documents 1 and 2).

JP 2002-322322 A JP 2012-500880 A

  An object of the present invention is to provide a flame-retardant resin composition and a molded article capable of suppressing the content of antimony and obtaining a molded article having excellent flame retardancy.

The present inventors have found that, when the flame-retardant resin composition contains an antimony compound, particularly diantimony trioxide, diantimony trioxide is a poisonous substance and is a substance specified in the Specialization Law. I noticed that the applications were limited.
The present inventors have conducted intensive studies and found that the content of antimony in a flame-retardant resin composition can be suppressed by using a combination of a natural inorganic filler, a flame retardant, and a radical generator to a specific content. And completed the present invention.

According to the present invention, the following flame-retardant resin composition and the like are provided.
1. Including the following components (A) to (D),
Substantially free of antimony,
The content of the component (A) is 39.5% by mass or more and 98.5% by mass or less based on 100% by mass of the total of the components (A) to (C);
The content of the component (B) is 1% by mass or more and 60% by mass or less based on a total of 100% by mass of the contents of the components (A) to (C);
The content of the component (C) is 0.5% by mass or more and 20% by mass or less based on a total of 100% by mass of the contents of the components (A) to (C);
Flame-retardant resin in which the content of the component (D) is 0.01 part by mass or more and 3.0 parts by mass or less based on a total of 100 parts by mass of the components (A) to (C). Composition.
(A) Polyolefin
(B) natural inorganic filler (C) flame retardant (D) radical generator 2. The flame retardant resin composition according to 1, wherein the melt flow rate at 230 ° C. of the flame retardant resin composition is 0.01 g / 10 min or more and 100 g / 10 min or less.
3. 3. The flame-retardant resin composition according to 1 or 2, wherein the component (A) contains polypropylene.
4. 4. The flame-retardant resin composition according to any one of 1 to 3, wherein the component (A) has a melt flow rate at 230 ° C of 0.01 g / 10 min to 100 g / 10 min.
5. The flame-retardant resin composition according to any one of 1 to 4, wherein the component (A) is polypropylene.
6. The flame-retardant resin composition according to any one of 1 to 5, wherein the component (B) contains at least one selected from the group consisting of talc and wollastonite.
7. The component (B) is talc,
The flame-retardant resin composition according to any one of 1 to 6, wherein the component (B) has an average particle size of 7 μm or more and 30 μm or less.
8. The flame-retardant resin composition according to any one of 1 to 7, wherein the component (C) contains a halogen-based flame retardant.
9. The flame-retardant resin composition according to any one of 1 to 8, wherein the component (C) contains a brominated flame retardant.
10. The flame-retardant resin composition according to any one of 1 to 9, wherein the component (C) contains tris (tribromoneopentyl) phosphate.
11. The flame-retardant resin composition according to any one of 1 to 10, wherein the melting point of the component (C) is from 50 ° C to 250 ° C.
12. The flame-retardant resin composition according to any one of 1 to 11, wherein the decomposition temperature of the component (C) is from 200 ° C to 400 ° C.
13. 13. The flame-retardant resin composition according to any one of 1 to 12, wherein the component (D) contains a 2,3-dimethyl-2,3-diphenyl-butane structure.
14． The flame-retardant resin composition according to any one of 1 to 13, wherein the component (D) is 2,3-dimethyl-2,3-diphenyl-butane or poly-1,4-diisopropylbenzene.
15. A molded article produced using the flame-retardant resin composition according to any one of 1 to 14.

  ADVANTAGE OF THE INVENTION According to this invention, the content of antimony can be suppressed and the flame-retardant resin composition and molded object which can obtain the molded object excellent in flame retardance can be provided.

In this specification, “x to y” represents “x or more and y or less”.
In the present specification, a rule that is preferable can be arbitrarily adopted, and it can be said that a combination of preferable ones is more preferable.
Arbitrary components can be added as long as the effects of the invention are not impaired.

  In the present specification, the “carbon number XX to YY” in the expression “substituted or unsubstituted ZZ group having XX to YY carbon atoms” represents the number of carbon atoms when the ZZ group is unsubstituted. The carbon number of the substituent in the case where it is performed is not included. Here, “YY” is larger than “XX”, and “XX” and “YY” each mean an integer of 1 or more.

  In the present specification, “the number of atoms XX to YY” in the expression “substituted or unsubstituted ZZ group having the number of atoms XX to YY” represents the number of atoms when the ZZ group is unsubstituted. Does not include the number of substituent atoms. Here, “YY” is larger than “XX”, and “XX” and “YY” each mean an integer of 1 or more.

  “Unsubstituted” in the case of “substituted or unsubstituted” means that the compound is not substituted with the substituent and a hydrogen atom is bonded.

One embodiment of the flame-retardant resin composition of the present invention contains the following components (A) to (D),
Antimony is not substantially contained, and the content of the component (A) is 39.5 to 98.5% by mass (preferably, based on 100% by mass of the total of the components (A) to (C)). Is from 40 to 97% by mass, more preferably from 52 to 96% by mass, still more preferably from 59 to 95% by mass, particularly preferably from 66 to 94% by mass, and the content of the component (B) is (A) 1) to 60% by mass (preferably 2 to 50% by mass, more preferably 3 to 40% by mass, and still more preferably 4 to 35% by mass) based on a total of 100% by mass of the components (A) to (C). %, Particularly preferably 5 to 30% by mass), and the content of the component (C) is 0.5 to 20% based on the total content of the components (A) to (C) being 100% by mass. % By mass (preferably 0.7 to 10% by mass, more preferably 0 to 10% by mass. 8 to 8 wt%, more preferably from 0.9 to 6% by weight, particularly preferably 1-4 wt%),
The content of the component (D) is 0.01 to 3.0 parts by mass (preferably 0.02 to 1 part by mass) based on a total of 100 parts by mass of the components (A) to (C). 0.0 parts by mass, more preferably 0.03 to 0.8 parts by mass, still more preferably 0.04 to 0.5 parts by mass, particularly preferably 0.05 to 0.3 parts by mass) Composition.
(A) Polyolefin (hereinafter also referred to as “component (A)”)
(B) Natural inorganic filler (hereinafter, also referred to as “(B) component”)
(C) Flame retardant (hereinafter also referred to as “component (C)”)
(D) Radical generator (hereinafter, also referred to as “(D) component”)

Thereby, the content of antimony can be suppressed and a molded article excellent in flame retardancy can be obtained.
Further, as an optional effect, the content of the component (C) can be reduced. Therefore, cost can be reduced as an optional effect.
Further, as an optional effect, sufficient flame retardancy (for example, V-2 described later) can be obtained even if the obtained molded body is a thin material.

In one embodiment of the flame-retardant resin composition of the present invention, the melt flow rate (MFR) at 230 ° C. is preferably from 0.01 to 100 g / 10 minutes, and from 0.1 to 100 g, from the viewpoint of flame retardancy and moldability. 90 g / 10 min is more preferable, 1 to 70 g / 10 min is further preferable, and 3 to 50 g / 10 min is particularly preferable.
In one embodiment of the flame-retardant resin composition of the present invention, the MFR is measured at 230 ° C. and 2.16 kg in accordance with ASTM D-1238 (2013).

One embodiment of the flame-retardant resin composition of the present invention does not substantially contain antimony.
The expression "substantially free of antimony" indicates that the content is less than the detection limit (2000 ppm) of the following measuring apparatus.
The antimony content is measured using an EDS (energy dispersive X-ray analysis) device built in JSM-6390LA (manufactured by JEOL Ltd.).

The polyolefin is not particularly limited, and examples thereof include a homopolyolefin and an olefin copolymer.
Examples of the polyolefin include polypropylene and polyethylene. From the viewpoint of heat resistance of the molded article, polypropylene is preferable.

Examples of the olefin include ethylene, propylene, butene, hexene, and α-olefin.
Examples of the α-olefin include 1-butene, 1-hexene, 1-pentene, 4-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, And 1-eicosene.

  Examples of the homopolyolefin include homopolyethylene (for example, low-density polyethylene, linear low-density polyethylene, linear low-density polyethylene, and high-density polyethylene), and homopolypropylene. From the viewpoint of heat resistance of the molded article, homopolypropylene is preferred.

  The olefin copolymer may be a block copolymer, a random copolymer, or a mixture thereof.

  Examples of the olefin copolymer include a propylene copolymer and an ethylene copolymer. Examples of the propylene copolymer include a copolymer of propylene and the above-mentioned olefin other than propylene. Examples of the ethylene copolymer include a copolymer of ethylene and the above-mentioned olefin other than ethylene. The olefins may be used alone or in combination of two or more.

  From the viewpoint of light weight, moldability, rigidity of the molded article, and impact resistance of the molded article, the MFR of the component (A) at 230 ° C. is 0.01 to 100 g / 10 min. Is preferably, 0.1 to 90 g / 10 min is more preferable, 1 to 70 g / 10 min is more preferable, and 3 to 50 g / 10 min is particularly preferable.

  The MFR of the component (A) at 230 ° C. is measured at 230 ° C. and 2.16 kg according to ASTM D-1238 (2013).

  Examples of commercially available polyolefins include Prime Polymer Co., Ltd.'s polypropylene "Prime Polypro", "Polyfine", "Prime TPO" and other series (for example, part numbers "J-700GP", "J106MG", "J707G", " H700 "," H-100M "," J105P "," J707P "," F-300SP "," J-466HP "," E-105GM "); polypropylene manufactured by Idemitsu Kosan Co., Ltd. (for example, product number" J-966HP ") )); Various polyethylene resins manufactured by Prime Polymer Co., Ltd. such as "HIZEX", "NEOSEX", "UltZEX", "MORETECH", "EVOLUE" and the like (for example, high-density polyethylene resin, product number "2200J"); Low-density polyethylene manufactured by Tosoh Corporation (for example, Sen 190 "), and the like.

  The component (A) is preferably polypropylene from the viewpoint of heat resistance of the molded article.

  The component (A) may be used alone or in combination of two or more.

Examples of the component (B) include talc and wollastonite.
The component (B) preferably contains at least one selected from the group consisting of talc and wollastonite from the viewpoint of flame retardancy.

When the component (B) is talc, the average particle size (D50) is preferably from 7 to 30 μm, more preferably from 10 to 20 μm, from the viewpoint of improving the flame retardancy of the flame-retardant resin composition.
The average particle diameter (D50) refers to a diameter at which, when a powder is divided into two from a certain particle diameter, the larger side and the smaller side have the same amount.
When the component (B) is talc, the average particle size (D50) of the component (B) is measured by a laser diffraction type particle size distribution analyzer.

When the component (B) is wollastonite, a 400 mesh (ASTM standard) passage rate is preferably 90% or more, more preferably 95% or more, and still more preferably from the viewpoint of improving the flame retardancy of the resin composition. Is 98% or more. Further, it is preferably 100% or less.
The 400 mesh pass rate is determined by a pass rate when a sample is placed on a 400 mesh and sieved with a vibration sieve.

From the viewpoint of the compound (mixing) and from the viewpoint of suppressing the failure phenomenon during molding, the water content when the component (B) is talc is preferably 0 to 0.5%, more preferably 0 to 0.1%. preferable.
The water content of the component (B) is measured using the Karl Fischer method.

When the component (B) is talc, the whiteness W value is preferably from 50 to 100%, more preferably from 70 to 100%, from the viewpoint of the appearance of the molded article.
The whiteness W value of the component (B) is measured using an SM color computer.

In the case where the component (B) is talc, the apparent specific gravity is preferably from 0.2 to 0.8 g / ml, more preferably from 0.3 to 0.5 g / ml, from the viewpoint of feed during compounding.
The apparent specific gravity of the component (B) is measured according to JIS K5101.

When the component (B) is talc, the ignition loss of 500 ° C. is preferably 0 to 6%, more preferably 0 to 3%, from the viewpoint of the appearance of the molded article.
(B) The ignition loss of 500 ° C. when the component is talc is measured using a muffle furnace.

  As the component (B), one type may be used alone, or two or more types may be used in combination.

The melting point of the component (C) is preferably from 50 to 250 ° C, more preferably from 100 to 200 ° C, from the viewpoint of flame retardancy.
The melting point of the component (C) is measured using TGA (thermogravimetric analysis) / DSC (differential scanning calorimeter) 1 described later.

The decomposition temperature of the component (C) is preferably from 200 to 400 ° C, more preferably from 250 to 350 ° C, from the viewpoint of heat resistance.
The decomposition temperature of the component (C) is measured using TGA / DSC1 described below.

  Examples of the component (C) include a halogen-based flame retardant and a phosphorus-based flame retardant.

  Examples of the halogen-based flame retardant include 2,4,6-tris (2,4,6-tribromophenoxy) -1,3,5-triazine, brominated epoxy oligomer, ethylenebis (pentabromophenyl), ethylenebis ( Tetrabromophthalimide), decabromodiphenyl ether, tetrabromobisphenol A, halogenated polycarbonate, halogenated polycarbonate (co) polymer, halogenated polycarbonate or oligomer of halogenated polycarbonate (co) polymer, halogenated polystyrene, halogenated polyolefin, etc. Is mentioned.

Examples of the halogen-based flame retardant include a brominated flame retardant.
The component (C) preferably contains a brominated flame retardant from the viewpoint of flame retardancy.
As brominated flame retardants,
2,2-bis [3,5-dibromo-4- (2,3-dibromopropoxy) phenyl] propane, bis [3,5-dibromo-4- (2,3-dibromopropoxy) phenyl] sulfone, pentabromo Benzyl acrylate polymer, 1,2,5,6,9,10-hexabromocyclododecane, 2,4,6-tris- (2,4,6-tribromophenoxy) -1,3,5-triazine, , 2-bis (bromomethyl) -1,3-propanediol, tribromo-neopentyl alcohol, 2,2-bis (4-allyloxy-3,5-dibromophenyl) propane, BC-52 tetrabromobisphenol A, BC- 58 tetrabromobisphenol A, tetrabromobisphenol A, 1,1 '-[ethylenebis (oxy)] bis (2,4,6-to Libromobenzene), pentabromobenzyl acrylate, tribromophenol acrylate, octabromodiphenyl ether, 2,2 ′-[isopropylidenebis [(2,6-dibromo-4,1-phenylene) oxy]] diethanol, N-methyl Hexabromodiphenylamine, TBA bisbromoethyl ether,
Tris (tribromoneopentyl) phosphate, tris-dibromopropyl isocyanurate and the like can be mentioned.
The component (C) preferably contains tris (tribromoneopentyl) phosphate and tris-dibromopropylisocyanurate, and more preferably contains tris (tribromoneopentyl) phosphate from the viewpoint of flame retardancy.

  As the component (C), one type may be used alone, or two or more types may be used in combination.

The decomposition temperature of the component (D) is preferably from 80 to 280 ° C, more preferably from 120 to 240 ° C, from the viewpoint of flame retardancy.
The decomposition temperature of the component (D) is measured using TGA / DSC1 described below.

The melting point of the component (D) is preferably from 50 to 250 ° C, more preferably from 100 to 200 ° C, from the viewpoint of flame retardancy.
The melting point of the component (D) is measured using TGA / DSC1 described below.

Examples of the component (D) include organic peroxides, initiators in which carbon-carbon bonds are cleaved, and initiators in which nitrogen-nitrogen bonds are cleaved.
The component (D) preferably contains a 2,3-dimethyl-2,3-diphenyl-butane structure (also referred to as a dicumene structure).
Examples of the component (D) include 2,3-dimethyl-2,3-diphenyl-butane and poly-1,4-diisopropylbenzene (tri-1,4-diisopropylbenzene).
The component (D) is preferably 2,3-dimethyl-2,3-diphenyl-butane from the viewpoint of flame retardancy.
The component (D) is preferably poly-1,4-diisopropylbenzene from the viewpoint of flame retardancy.

One embodiment of the flame-retardant resin composition of the present invention may further contain an additive, if necessary.
Examples of the additive include an ultraviolet absorber, a light stabilizer, an antioxidant, a lubricant, a crystal nucleating agent, a softener, an antistatic agent, a metal deactivator, an antibacterial or antifungal agent, and a pigment.

The ultraviolet absorber is not particularly limited, and examples thereof include a benzophenone-based compound, a benzotriazole-based compound, a benzoate-based compound, and a polyamide polyether block copolymer (providing permanent antistatic performance).
Although it does not specifically limit as an antioxidant, A phenolic antioxidant, a phosphorus antioxidant, a thioether antioxidant, etc. are mentioned.
Examples of the lubricant include, but are not particularly limited to, fatty acid amide lubricants, fatty acid ester lubricants, fatty acid lubricants, and fatty acid metal salt lubricants.
Examples of the crystal nucleating agent include, but are not particularly limited to, sorbitols, phosphorus-based nucleating agents, rosins, petroleum resins, and the like.
Examples of the softener include, but are not particularly limited to, liquid paraffin, mineral oil-based softener (process oil), and mineral oil-based softener for non-aromatic rubber (process oil).

The antistatic agent is not particularly limited, and examples thereof include cationic antistatic agents, anionic antistatic agents, nonionic antistatic agents, amphoteric antistatic agents, and fatty acid partial esters such as glycerin fatty acid monoester. .
Although it does not specifically limit as a metal deactivator, A hydrazine type metal deactivator, a nitrogen compound type metal deactivator, a phosphite ester type metal deactivator, etc. are mentioned.
The antibacterial or antifungal agent is not particularly limited, and examples thereof include an organic compound antibacterial or antifungal agent, a natural organic antibacterial and antifungal agent, and an inorganic antibacterial or antifungal agent.
Examples of the pigment include, but are not particularly limited to, inorganic pigments and organic pigments.
Examples of the inorganic pigment include titanium oxide, calcium carbonate, carbon black, and the like.
Examples of the organic pigment include an azo pigment, an acid dye lake, a basic dye lake, a condensed polycyclic pigment, and the like.

Further, as additives, nitrogen compounds, metal hydroxides, silicone-based flame retardants, organic alkali metal salts, organic alkaline earth metal salts,
Boric acid compounds such as zinc borate, zinc metaborate, barium metaborate, aluminum borate, sodium polyborate,
Silicon compounds such as silica (silicon dioxide), synthetic amorphous silica (silicon dioxide), aluminum silicate, magnesium silicate, calcium silicate, zirconium silicate, and diatomaceous earth;
Metal oxides such as aluminum oxide, magnesium oxide, barium oxide, titanium oxide, zinc oxide, tin oxide, zirconium oxide, molybdenum oxide, zirconium-antimony composite oxide, and expandable graphite do not impair the effects of the invention. You may add in the range.

  One of the above additives may be used alone, or two or more thereof may be used in combination. The amount of the additive is not particularly limited as long as the properties of the flame-retardant resin composition are not impaired.

One embodiment of the flame-retardant resin composition of the present invention essentially comprises the components (A) to (D) and optionally additives, and is unavoidable unless the effects of the present invention are impaired. It may contain impurities.
For example, 80 to 100% by mass, 90 to 100% by mass, 95 to 100% by mass, 98 to 100% by mass or 100% by mass of one embodiment of the flame-retardant resin composition of the present invention,
It may be composed of components (A) to (D), or components (A) to (D), and optionally additives.

One embodiment of the flame-retardant resin composition of the present invention can be produced, for example, by blending the components (A) to (D) and, if necessary, an additive, followed by hot-melt mixing (kneading). . For example, the above components can be blended and kneaded using a Henschel mixer, a Banbury mixer, a single screw extruder, a twin screw extruder, a multi-screw extruder, a coneder, or the like. The heating temperature during kneading is usually 160 to 250 ° C.
Further, the above components may be blended and preliminarily mixed by a commonly used device (for example, a ribbon blender, a drum tumbler, etc.), and then kneaded by the above device.

  Examples of the shape of one embodiment of the flame-retardant resin composition of the present invention include pellets.

One embodiment of the molded article of the present invention can be manufactured using the above-described flame-retardant resin composition.
The production can be performed by, for example, an injection molding method, an injection compression molding method, an extrusion molding method, a blow molding method, a press molding method, a vacuum molding method, a foam molding method, or the like.
One embodiment of the molded article of the present invention can be suitably used for, for example, automobiles, industrial materials, building materials, electronic and electrical equipment, OA equipment, mechanical fields, home appliances, and home appliances (high-grade).

Examples 1 to 14 and Comparative Examples 1 to 9
[Production of flame-retardant resin composition]
The components shown in Tables 1 and 2 were mixed with the mixing ratios shown in Tables 1 and 2 (% by mass based on a total of 100% by mass of the contents of the components (A) to (C), or the components (A) to ( C) The components are melt-mixed with a twin-screw extruder PCM-30 (manufactured by Ikegai Co., Ltd.) at 200 ° C. and 250 rpm to give pellets (flame-retardant resin). Composition).

The components used are shown below.
(A) Component Resin A: J-700GP (manufactured by Prime Polymer Co., Ltd., homopolypropylene, melt flow rate (MFR) at 230 ° C .: 8.0 g / 10 minutes)
Resin B: J106MG (Homopolypropylene, manufactured by Prime Polymer Co., Ltd., MFR at 230 ° C .: 15 g / 10 minutes)
Resin C: J707G (manufactured by Prime Polymer Co., Ltd., block polypropylene, MFR at 230 ° C .: 30 g / 10 minutes)

(B) Component Natural inorganic filler A: ILF-BAH (manufactured by Asada Flour Milling Co., Ltd., average particle size (D50): 17 μm, talc, moisture: 0.04%, whiteness W value: 92%, apparent specific gravity: 0. 4 g / ml, loss on ignition 500 ° C: 0.02%)
Natural inorganic filler B: Jilin Prov. Lishu Daddingshan Wollastonite (Jilin Province) (manufactured by Hulan Wollastonite Mining, wollastonite, distribution: 400 mesh (ASTM standard) transmission rate 98.2%)

(C) Component Flame retardant A: CR-900 (manufactured by Daihachi Chemical Industry Co., Ltd., tris (tribromoneopentyl) phosphate, melting point: 182 ° C, decomposition temperature: 313 ° C (TGA (thermogravimetric analysis) 1% loss) )

ラジカル発生剤Ｂ：ＣＣ−Ｐ３（ユナイテッドイニシエーターズ社製、ポリ-１，４−ジイソプロピルベンゼン、下記式で表される化合物、融点：１０５〜１３５℃、分解温度：１７０℃（ＴＧＡ１％ｌｏｓｓ））

(D) Component Radical generator A: NOFMER BC-90 (manufactured by NOF CORPORATION, 2,3-dimethyl-2,3-diphenyl-butane, purity: 86%, compound represented by the following formula, melting point: 80 to 130 ° C, decomposition temperature: 140 ° C (TGA (thermogravimetric analysis) 1% loss)

Radical generator B: CC-P3 (manufactured by United Initiators, poly-1,4-diisopropylbenzene, a compound represented by the following formula, melting point: 105 to 135 ° C, decomposition temperature: 170 ° C (TGA 1% loss) )

  The MFR of the component (A) was measured at 230 ° C. and 2.16 kg in accordance with ASTM D-1238 (2013).

  In the component (B), the average particle size of the natural inorganic filler A was measured by a laser diffraction type particle size distribution analyzer LA-300 (manufactured by Horiba, Ltd.).

In the component (B), the distribution of the natural inorganic filler B was measured by a 400 mesh (ASTM standard) passage rate.
The 400 mesh passage rate was determined from the passage rate when a sample was placed on a 400 mesh and sieved with a vibration sieve.

In the component (B), the water content of the natural inorganic filler A was measured by the Karl Fischer method using a water content measuring device VA-06 / CA-06 (manufactured by Mitsubishi Kasei Corporation).
In the component (B), the whiteness W value of the natural inorganic filler A was measured using an SM color computer SM45 (manufactured by Suga Test Instruments Co., Ltd.).
In the component (B), the apparent specific gravity of the natural inorganic filler A was measured according to JIS K5101.
In the component (B), the ignition loss of the natural inorganic filler A at 500 ° C. was measured using a muffle furnace F0610 (manufactured by Yamato Scientific Co., Ltd.), weighing 1 g of the natural inorganic filler A, and measuring at 500 ° C. for 3 hours. did.

The melting points of the components (C) and (D) were measured using TGA / DSC1 (manufactured by METTLER TOLEDO). The temperature was increased from 30 ° C. to 600 ° C., the temperature was increased at a rate of 20 ° C./min, and the measurement was performed in an N ₂ atmosphere.
The decomposition temperatures of the components (C) and (D) were measured using TGA / DSC1. The temperature was increased from 30 ° C. to 600 ° C., the temperature was increased at a rate of 20 ° C./min, and the temperature was measured under a N ₂ atmosphere.

[Measurement of MFR of flame-retardant resin composition]
The MFR of the obtained pellet was measured at 230 ° C. and 2.16 kg in accordance with ASTM D-1238 (2013). The results are shown in Tables 1 and 2.

[Manufacture of molded body]
After drying the obtained pellets at 80 ° C., they were molded at 200 ° C. by an injection molding machine (“NEX110III” manufactured by Nissei Plastics Industries, Ltd.), and UL test pieces having a thickness of 0.8 mm or 1.6 mm, respectively. (Test specimen for UL94 test described below) (molded body) was produced.

[Measurement of antimony (Sb) content]
The obtained pellets and compacts were measured at an accelerating voltage of 20 kV using an EDS (energy dispersive X-ray analysis) device built in JSM-6390LA (manufactured by JEOL Ltd.). The results are shown in Tables 1 and 2. "-" Indicates that it is below the detection limit (2000 ppm).

[Flame retardancy evaluation 1 (thickness 0.8 mm)]
For a 0.8 mm thick UL test specimen obtained in the production of a molded article, a vertical flame test (UL94 test) was performed using a flame retardancy evaluation tester (HVUL plastic UL combustion test chamber manufactured by Atlas) in accordance with UL94 standard. ) Was done. Specifically, the five test pieces were ranked in flame retardancy according to the UL94 standard based on the first and second burning times and whether or not cotton was ignited.
The results are shown in Tables 1 and 2.

[Flame retardancy evaluation 2 (thickness 1.6 mm)]
The evaluation was performed in the same manner as in the evaluation of flame retardancy 1, except that the UL test piece having a thickness of 1.6 mm obtained in the production of the molded article was used instead of the UL test piece having a thickness of 0.8 mm. The results are shown in Tables 1 and 2.

Claims (15)

Including the following components (A) to (D),
Substantially free of antimony,
The content of the component (A) is 39.5% by mass or more and 98.5% by mass or less based on 100% by mass of the total of the components (A) to (C);
The content of the component (B) is 1% by mass or more and 60% by mass or less based on a total of 100% by mass of the contents of the components (A) to (C);
The content of the component (C) is 0.5% by mass or more and 20% by mass or less based on a total of 100% by mass of the contents of the components (A) to (C);
Flame-retardant resin in which the content of the component (D) is 0.01 part by mass or more and 3.0 parts by mass or less based on a total of 100 parts by mass of the components (A) to (C). Composition.
(A) Polyolefin
(B) Natural inorganic filler (C) Flame retardant (D) Radical generator   The flame retardant resin composition according to claim 1, wherein the melt flow rate at 230 ° C of the flame retardant resin composition is 0.01 g / 10 min or more and 100 g / 10 min or less.   The flame-retardant resin composition according to claim 1, wherein the component (A) contains polypropylene.   The flame-retardant resin composition according to any one of claims 1 to 3, wherein the melt flow rate of the component (A) at 230 ° C is from 0.01 g / 10 min to 100 g / 10 min.   The flame-retardant resin composition according to any one of claims 1 to 4, wherein the component (A) is polypropylene.   The flame-retardant resin composition according to any one of claims 1 to 5, wherein the component (B) contains one or more selected from the group consisting of talc and wollastonite. The component (B) is talc,
The flame-retardant resin composition according to any one of claims 1 to 6, wherein the component (B) has an average particle diameter of 7 µm or more and 30 µm or less.   The flame-retardant resin composition according to any one of claims 1 to 7, wherein the component (C) contains a halogen-based flame retardant.   The flame-retardant resin composition according to any one of claims 1 to 8, wherein the component (C) contains a bromine-based flame retardant.   The flame-retardant resin composition according to any one of claims 1 to 9, wherein the component (C) contains tris (tribromoneopentyl) phosphate.   The flame-retardant resin composition according to any one of claims 1 to 10, wherein the melting point of the component (C) is from 50C to 250C.   The flame retardant resin composition according to any one of claims 1 to 11, wherein the decomposition temperature of the component (C) is 200C or higher and 400C or lower.   The flame-retardant resin composition according to any one of claims 1 to 12, wherein the component (D) has a 2,3-dimethyl-2,3-diphenyl-butane structure.   The flame-retardant resin composition according to any one of claims 1 to 13, wherein the component (D) is 2,3-dimethyl-2,3-diphenyl-butane or poly-1,4-diisopropylbenzene.   A molded article produced using the flame-retardant resin composition according to claim 1.