JP2001139735A - Flame-retardant polyolefin-based resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject halogen-free composition having excellent flame retardancy and mechanical properties and generating neither corrosive gas nor toxic gas when burnt or subjected to molding processing operation. SOLUTION: This flame-retardant polyolefin-based resin composition is obtained by compounding 100 pts.wt. of a polyolefin-based resin with a total of 25-45 pts.wt. of aluminum hydroxide and a non-halogen phosphoric ester in the weight ratio of (2:1) to (1:2).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a flame-retardant polyolefin resin composition. More specifically, the present invention provides a non-halogen flame-retardant polyolefin resin composition having excellent mechanical properties without generating corrosive gas or toxic gas due to thermal decomposition of the resin composition during molding and combustion. About things.

[0002]

2. Description of the Related Art Thermoplastic resins such as polyolefin resins have excellent properties such as being relatively inexpensive to manufacture and being easy to mold, and are widely used in all kinds of household goods. However, since thermoplastic resins are generally flammable, flame retarding treatment is performed by various methods when using them.

[0003] In order to impart flame retardancy to a thermoplastic resin, a method of blending various halogen-based flame retardants has been widely adopted. Although the flame retardancy is improved by this method, a corrosive gas is generated at the time of molding and the peripheral equipment may be corroded. Therefore, special equipment for treating the corrosive gas is required. Further, since a large amount of smoke is generated at the time of combustion and contains a toxic gas such as hydrogen halide, the human body is adversely affected at the time of combustion such as fire. Therefore, non-halogen flame retardants are demanded as flame retardants.

Non-halogen flame retardants that do not generate corrosive or toxic gases include hydrated metal oxides such as aluminum hydroxide, magnesium hydroxide, calcium hydroxide and basic magnesium carbonate (inorganic hydration). Object). In particular, magnesium hydroxide is widely used because it has a high dehydration decomposition temperature and is excellent in smoke suppression effect at the time of combustion. However, in order to impart sufficient flame retardancy to the resin using the hydrated metal oxide as described above,
Large amounts need to be added. As a result, there is a problem that the mechanical properties of the obtained molded article are significantly reduced, and the molded article cannot be put to practical use.

Further, Japanese Patent Application Laid-Open No. 6-25485 discloses that
A flame retardant method using an inorganic hydrate and a phosphorus compound in combination is disclosed. In this method, an inorganic hydrate such as magnesium hydroxide and red phosphorus are added to a thermoplastic resin. However, a large amount of a flame retardant must be added to obtain sufficient flame retardancy while maintaining good mechanical properties.

[0006] With the diversification and enlargement of uses of molded articles obtained from flame-retardant resin compositions such as electric / electronic parts, mechanical parts, and automobile parts, the practical use conditions required for these articles ( Mechanical properties, heat resistance, electrical insulation, etc.) have become more stringent each year. The above prior art cannot sufficiently satisfy such a demand.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention does not generate corrosive gas or toxic gas during molding and burning, has excellent flame retardancy and mechanical properties, and contains halogen. An object of the present invention is to provide a polyolefin-based resin composition that does not have the above characteristics.

[0008]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have made aluminum hydroxide and a non-halogen phosphate ester into a polyolefin resin at a specific mixing ratio. By doing so, it was found that a flame-retardant polyolefin-based resin composition having excellent mechanical properties without the generation of corrosive gas or toxic gas at the time of thermal decomposition of the resin composition was obtained, and to complete the present invention. It has arrived.

Thus, according to the present invention, aluminum hydroxide having a blending ratio (weight ratio) of 2: 1 to 1: 2 with respect to 100 parts by weight of the polyolefin resin is mixed with a non-halogen phosphate ester. 25 to 45 as the total amount of
Provided is a flame-retardant polyolefin-based resin composition blended by weight.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The polyolefin resin of the present invention includes polyethylene resin, modified polyethylene resin, polypropylene resin, modified polypropylene resin, poly (1-butene) resin and polypentene resin. Of these, polypropylene resins and modified polypropylene resins are particularly preferred.

The polyethylene resin and the modified polyethylene resin include an ethylene homopolymer (polyethylene), a copolymer containing ethylene as a main component, and a mixture thereof. Examples of the copolymer containing ethylene as a main component include, for example, ethylene-
α-olefin copolymers, for example, propylene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-butene and 1
-Pentene and the like.

As the copolymer other than the α-olefin,
For example, an ethylene-vinyl acetate copolymer, an ethylene-methyl (meth) acrylate copolymer, an ethylene-ethyl (meth) acrylate copolymer and the like can be mentioned.

Examples of the polypropylene resin and the modified polypropylene resin include propylene homopolymer (polypropylene), which is a homopolymer composed of only propylene units, a copolymer containing propylene as a main component, and a mixture thereof. Examples of the copolymer containing propylene as a main component include, for example, a propylene-α-olefin copolymer containing propylene as a main component, and the α-olefin described in the copolymer containing ethylene as a main component. α-olefins. These copolymers have a block copolymer or random copolymer structure depending on the composition ratio, but may have any structure.

As the copolymer other than the α-olefin,
For example, a propylene-vinyl acetate copolymer, a propylene-methyl (meth) acrylate copolymer, a propylene-ethyl (meth) acrylate copolymer and the like can be mentioned. Here, (meth) acrylate means methacrylate and acrylate.

In the present invention, resins other than polyolefin resins can be used as long as they do not adversely affect the performance of the obtained resin composition. These resins include, for example, styrene resins, high impact polystyrene, polyvinyl chloride, ACS resins, AS resins, AB
S resin, modified polyphenylene oxide, polymethyl methacrylate, polyamide, polycarbonate, polyphenylene sulfide, polyimide, polyether ether ketone, polyether sulfone, polysulfone, polyarylate, polyether ketones, polyether nitrile, polythioether sulfone, polybenzimidazole Thermoplastic resins such as polycarbodiimides, liquid crystal polymers, composite plastics and mixtures thereof, and thermosetting resins such as polyurethanes, phenolic resins, melamine resins, urea resins, unsaturated polyesters, diallyl phthalate resins and mixtures thereof. No.

The aluminum hydroxide of the present invention is preferably in the form of a powder, and has an average secondary particle diameter of 0.4 to 4 μm, preferably 0.6 to 4 μm, measured by a microtrack method.
1.5 μm, the specific surface area measured by the BET method is 1 to 15 m ² / g, preferably 3 to 10 m ² / g;
It is preferable that the ratio of the specific surface area measured by the BET method to the specific surface area measured by the Blaine method is 1 to 4, preferably 1 to 3 and that little or no secondary aggregation occurs.

With aluminum hydroxide having the above-mentioned physical properties, it is possible to maintain good mechanical strength and surface appearance of a molded article of the resin composition. Further, aluminum hydroxide may contain an iron compound, a manganese compound, and the like as impurities, and in the present invention, the total amount thereof is preferably 1,000 ppm or less in terms of metal.

Aluminum hydroxide can be directly blended with the resin as a flame retardant, but one treated with a surface treating agent can also be used. Examples of the surface treatment agent include higher fatty acids, coupling agents (silane-based, titanate-based, and aluminum-based) and phosphate esters. The surface treatment with these surface treatment agents can be performed by a known method, for example, using a surface treatment agent of 10% by weight or less, preferably 5% by weight or less based on aluminum hydroxide particles.

The surface treating agents preferably used include higher fatty acids having 10 or more carbon atoms, such as stearic acid, erucic acid, palmitic acid, lauric acid and behenic acid, and alkali metal salts thereof; vinylethoxysilane, vinyl- Tris (2-methoxy-ethoxy) silane, γ-
Methacryloxypropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-
Aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropyltriethoxysilane, N
-Phenyl-γ-aminopropyltrimethoxysilane,
silane coupling agents such as β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane and γ-mercaptopropyltrimethoxysilane; isopropyl triisostearoyl titanate, isopropyl tris (dioctyl) Titanate-based coupling agents such as (bilophosphate) titanate, isopropyl tri (N-aminoethyl-aminoethyl) titanate and isopropyl tridecylbenzenesulfonyl titanate; aluminum-based coupling agents such as acetoalkoxy aluminum diisopropylate; No.

In the present invention, the surface is subjected to acid-resistant coating with a silicon compound and / or a boron compound,
Further, if necessary, aluminum hydroxide surface-treated with the above-mentioned surface-treating agent can also be used. Such aluminum hydroxide imparts acid resistance to the resin composition.

The non-halogen phosphate of the present invention can be synthesized by reacting phosphorus oxychloride with a hydroxy compound having either a phenolic hydroxyl group or an alcoholic hydroxyl group. Examples of the non-halogen phosphate preferably used in the present invention include:
For example, the general formula (I):

[0022]

Embedded image

(Wherein R ¹ , R ² , R ³ and R ⁴ are the same or different and each represents an alkyl group having 1 to 18 carbon atoms or an aryl group having 6 to 15 carbon atoms which may be substituted) , R ⁵ is a divalent group or hydroquinone formed by removing one hydrogen atom from each of carbon atoms at both ends of a linear alkane,
A divalent residue corresponding to resorcinol or biphenyl, and n represents an integer of 0 to 20).

The alkyl group having 1 to 18 carbon atoms in the general formula (I) includes methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl and tert-
Butyl, 2-ethylhexyl, n-octyl, sec-
Examples include linear or branched alkyl groups such as octyl, decyl, dodecyl, palmityl (n-hexadecyl) and stearyl (n-octadecyl).

Examples of the optionally substituted aryl group having 6 to 15 carbon atoms include phenyl, (o-, m-, p-) cresyl [methylphenyl] and (o-, m-, p-) ethylphenyl. , (O-, m-, p-) n-propylphenyl,
(o-, m-, p-) isopropylphenyl, (o-, m
-, P-) n-butylphenyl, (o-, m-, p-) s
ec-butylphenyl, (o-, m-, p-) tert-
Butylphenyl, (o-, m-, p-) octylphenyl, (o-, m-, p-) nonylphenyl (2,3-, 2,4-,
2,5-, 2,6-, 3,4-, 3,5-) xylenyl [dimethylphenyl], (2,3-, 2,4-, 2,5-, 2,6-, 3,4 -, 3,5-) diethylphenyl, (2,3-, 2,4-, 2,5-, 2,6-, 3,4-, 3,5-)
Di-n-propylphenyl, (2,3-, 2,4-, 2,5-, 2,6
-, 3,4-, 3,5-) diisopropylphenyl, (2,3-, 2,4
-, 2,5-, 2,6-, 3,4-, 3,5-) di-n-butylphenyl, (2,3-, 2,4-, 2,5-, 2,6-, 3,4-, 3,5-) di-se
c-butylphenyl, (2,3-, 2,4-, 2,5-, 2,6-, 3,4
-, 3,5-) di-tert-butylphenyl, (2,3,4-,
2,3,5-, 2,3,6-, 2,4,5-, 2,4,6-, 3,4,5-) trimethylphenyl, (2,3,4-, 2,3, 5-, 2,3,6-, 2,4,5-, 2,4,6
-, 3,4,5-) triethylphenyl and (2,3,4-, 2,3,5
-, 2,3,6-, 2,4,5-, 2,4,6-, 3,4,5-) tri-n-propylphenyl and the like. Examples of the divalent group formed by removing one hydrogen atom from each of the carbon atoms at both ends of the linear alkane include ethylene, trimethylene and tetramethylene.

As shown in the general formula (I), the phosphate ester in the present invention includes not only monomers but also polymers such as dimers and trimers. The non-halogen phosphate ester of the present invention can be broadly classified into a phosphate ester containing no aromatic group and a phosphate ester containing an aromatic group. Examples of the phosphoric acid ester containing no aromatic group include trimethyl phosphate, triethyl phosphate, tri-n-butyl phosphate, triisopropyl phosphate, tri (2-ethylhexyl) phosphate, tridecyl phosphate and tri-triphosphate. Stearyl and the like.

Examples of the phosphoric ester containing an aromatic group include triphenyl phosphate, phosphoric acid [tri (o-, m-
-, P-) methylphenyl], phosphoric acid [tri (o-, m
-, P-) ethylphenyl], phosphoric acid [tri (o-, m-
-, P-) n-propylphenyl], phosphoric acid [tri (o
-, M-, p-) isopropylphenyl], [tri (o-, m-, p-) n-butylphenyl phosphate], [tri (o-, m-, p-) sec-butylphenyl phosphate] ],
Phosphoric acid [tri (o-, m-, p-) tert-butylphenyl], phosphoric acid [tri (o-, m-, p-) octylphenyl], phosphoric acid [tri (o-, m-, p −) Nonylphenyl],

Tris phosphate [(2,3-, 2,4-, 2,5-, 2,6
-, 3,4-, 3,5-) dimethylphenyl], tris-phosphate [(2,3-, 2,4-, 2,5-, 2,6-, 3,4-, 3,5- ) Diethylphenyl], tris phosphate [(2,3-, 2,4-, 2,5-, 2,6-,
3,4-, 3,5-) di-n-propylphenyl], tris [(2,3-, 2,4-, 2,5-, 2,6-, 3,4-, 3, 5-) diisopropylphenyl], tris phosphate [(2,3-, 2,4-, 2,5
-, 2,6-, 3,4-, 3,5-) di-n-butylphenyl], tris [(2,3-, 2,4-, 2,5-, 2,6-, 3,4-, 3,5-)
Di-sec-butylphenyl], trisphosphate [(2,3
-, 2,4-, 2,5-, 2,6-, 3,4-, 3,5-) di-tert-butylphenyl],

Tris phosphate [(2,3,4-, 2,3,5-, 2,3,6
-, 2,4,5-, 2,4,6-, 3,4,5-) trimethylphenyl],
Tris phosphate [(2,3,4-, 2,3,5-, 2,3,6-, 2,4,5-, 2,
4,6-, 3,4,5-) triethylphenyl], trisphosphate [(2,3,4-, 2,3,5-, 2,3,6-, 2,4,5-, 2 , 4,6-, 3,4,5
-) Tri-n-propylphenyl] and monomeric phosphates such as cresyldiphenyl phosphate, and

Alkylene bis [di (o-, m-, p-) methylphenyl phosphate], hydroquinone bis (diphenyl phosphate) and hydroquinone bis [diphosphate (O-, m-, p
-) Methylphenyl], hydroquinone bis [di (o-, m-, p-) ethylphenyl phosphate], hydroquinone bis [bis (2,3-, 2,4-, 2,5-, 2,5- 6-, 3,4-, 3,
5-) dimethylphenyl], alkylene bis [di (o-, m-, p-) methylphenyl phosphate], resorcinol bis [di (o-, m-, p-) methylphenyl phosphate], resorcinol bis [ Diphosphate (o-, m-, p
−) Ethylphenyl], resorcinol bis [bis (2,3-, 2,4-, 2,5-, 2,6-, 3,4-, 3,5-) dimethylphenyl phosphate], bisphenol A bis [Diphosphate (o-, m
-, P-) methylphenyl], bisbisphenol A
[Di (o-, m-, p-) ethylphenyl phosphate] and bisphenol A bis [bis (2,3-, 2,4-, 2,
5-, 2,6-, 3,4-, 3,5-) dimethylphenyl] and the like.

Here, "(o-, m-, p-)" independently represents a substituent on the benzene ring by o- (ortho), m- (meth), p- (para). Indicates that it has at any position of, for example, "(2,3-, 2,4-, 2,5-, 2,6-, 3,
4-, 3,5-) ”are each independently a substituent on the benzene ring, 2,3-, 2,4-, 2,5-, 2,6-,
It shows that it has in any position of 3,4- and 3,5-.

As a specific method for producing the non-halogenated phosphoric acid ester of the present invention, phosphorus oxychloride may be used in the absence of a catalyst or a catalyst such as a Lewis acid catalyst (for example, aluminum chloride, magnesium chloride and titanium tetrachloride). It is obtained by reacting with an appropriate alcohol or phenol in the presence. The aromatic bisphosphate is obtained by reacting phosphorus oxychloride with an aromatic monohydroxy compound (monohydric phenol) in the presence of the above-mentioned Lewis acid catalyst, and converting the resulting diaryl phosphorohalidate into the presence of a similar catalyst. It can be obtained by reacting with an aromatic dihydroxy compound (divalent phenol) below (for example, see JP-A-5-1079).

The aromatic bisphosphate can also be obtained by reacting phosphorus oxychloride with a dihydroxy compound, removing unreacted phosphorus oxychloride, and then reacting the product with an aromatic monohydroxy compound. (See JP-A-63-227632). In addition, aromatic bisphosphates convert phosphorus oxychloride,
It can also be obtained by reacting with a mixture of a monohydroxy compound and a dihydroxy compound. Among the non-halogen phosphates described above, the monomeric phosphate represented by n = 0 in the general formula (I) is capable of imparting high flame retardancy and excellent mechanical properties to the polyolefin resin. Preferably, among these, an aromatic group-containing phosphate ester is particularly preferred, and triphenyl phosphate is more preferred.

In the present invention, the non-halogen phosphates may be used alone or in combination of two or more. The non-halogen phosphate ester preferably has an acid value of 0.5 or less, and more preferably 0.1 or less, from the viewpoint of enhancing weather resistance and hydrolysis resistance of the molded resin composition.

The mixing ratio (weight ratio) of aluminum hydroxide and non-halogen phosphate to be mixed in the resin composition of the present invention is 2: 1 to 1: 2, preferably 1: 1 to 1: 2.
It is. When the compounding ratio is within the above range, a synergistic effect between the aluminum hydroxide and the non-halogen phosphate is exhibited, and a resin composition having excellent flame retardancy and mechanical properties can be obtained.

The amount of the aluminum hydroxide and the non-halogen phosphoric acid ester is determined by the amount of the polyolefin resin 10
The total amount is 25 to 45 parts by weight, preferably 30 to 40 parts by weight, and particularly preferably 40 parts by weight with respect to 0 parts by weight. When the amount of these components is less than 25 parts by weight,
It is not preferable because sufficient flame retardancy cannot be obtained. On the other hand, if the amount exceeds 45 parts by weight, the mechanical properties of the obtained molded product are reduced, and the resulting molded product is not practical.

The flame-retardant resin composition of the present invention may contain a flame-retardant other than aluminum hydroxide and a non-halogen phosphate, such as magnesium hydroxide and phosphorus, as long as the physical properties of the resin composition are not impaired. Melamine acid, ammonium polyphosphate, guanidine polyphosphate, melamine, melam and the like may be blended.

The flame-retardant resin composition of the present invention may contain red phosphorus powder, silicone, carbon powder and the like as a flame-retardant aid. As the red phosphorus powder, stabilized red phosphorus powders such as thermosetting resin-coated red phosphorus, olefin-coated red phosphorus, titanium oxide-coated red phosphorus, and titanium aluminum condensate-coated red phosphorus are preferably used.

The silicone includes silicone resin, silicone grease, silicone rubber and silicone oil. Examples of the carbon powder include graphite, activated carbon, and carbon black produced by an oil furnace method, a gas furnace method, a channel method, and an acetylene method. The amount of these flame retardant aids is 0.1 to 30 parts by weight based on 100 parts by weight of the polyolefin resin.
Parts by weight, preferably 0.5 to 20 parts by weight.

Further, the flame-retardant resin composition of the present invention comprises:
If necessary, various additives generally blended with the resin composition may be blended as long as the physical properties of the resin composition are not impaired, and these may be used alone or in combination. Examples of such additives include antioxidants and stabilizers such as phosphorus-based compounds such as pentaerythritol diphosphite derivatives, phenol-based compounds such as hindered phenol derivatives, amine-based and sulfur-based compounds; mica, talc, and alumina. Inorganic fillers and organic fillers such as wood flour; antistatic agents such as cationic surfactants and nonionic surfactants; reinforcing materials such as glass fibers, metal fibers and whiskers; benzophenones, salicylates, benzotriazoles And acrylonitrile-based ultraviolet absorbers and light stabilizers; fatty acid derivatives and high-melting wax-based lubricants and softeners; and titanium oxide and phthalocyanine-based pigments.

In the production of the flame-retardant resin composition of the present invention, the order of mixing the components and the method of mixing are not particularly limited.
For example, it can be obtained by mixing and melting and kneading the above components by a known method. For mixing and melt kneading, general-purpose kneading apparatuses such as a single-screw extruder, a twin-screw extruder, a Banbury mixer, a kneader mixer and a roll can be used alone or in combination. The obtained resin composition is further processed by a known method to obtain a desired shape, for example, a plate, sheet, or film.

The flame-retardant polyolefin-based resin composition of the present invention does not generate corrosive gas or toxic gas such as halogen-based gas during molding and burning, and has excellent flame retardancy and mechanical properties. Since it has no halogen, it has almost no safety problems such as toxicity to humans and corrosiveness to equipment. Therefore, by utilizing these properties, it can be usefully used as a material for electric / electronic parts, mechanical parts, and automobile parts.

More specifically, various gears, various cases, sensors, LED lamps, connectors, sockets, resistors, relay cases, switches, coil bobbins, capacitors, variable condenser cases, optical pickups, oscillators, various terminal boards, transformers , Plugs, printed wiring boards, tuners, speakers, microphones, headphones, small motors, magnetic head bases, power modules, housings, semiconductors, LCDs, FDD carriages, FDD chassis, motor brush holders, parabolic antennas and computer-related parts Electricity
Electronic components;

VTR parts, TV parts, irons, hair dryers, rice cooker parts, microwave parts, audio parts, audio equipment parts such as audio / laser discs / compact discs, lighting parts, refrigerator parts, air conditioner parts, typewriter parts And home and office electrical products such as word processor parts; office computer related parts, telephone related parts, facsimile related parts, copier related parts;

Various bearings such as cleaning jigs, oilless bearings, stern bearings and underwater bearings, motor parts, and machine-related parts represented by lighters and typewriters;
Optical equipment such as microscopes, binoculars, cameras and watches, and parts related to precision machinery;

Alternator terminal, alternator connector, IC regulator, potentiometer base for light deer, various valves such as exhaust gas valve, various pipes related to fuel, exhaust system, intake system, air intake nozzle snorkel, intake manifold, fuel pump, engine cooling Water joint, carburetor main body, carburetor spacer, exhaust gas sensor, cooling water sensor, oil temperature sensor, brake pad wear sensor, throttle position sensor, crankshaft position sensor, air flow meter, brake butt wear sensor, thermostat base for air conditioner, Heating hot air flow control valve, brush holder for radiator motor, water pump in Color, turbine base-in, wiper motor-related parts,

Distributor, starter switch, starter relay, transmission wire harness, window washer nozzle, air conditioner panel switch board, fuel related electromagnetic valve coil, fuse connector, horn terminal, electrical component insulating plate, step motor rotor, Lamp socket, lamp reflector, lamp housing, brake piston, solenoid bobbin, engine oil filter, ignition device case, personal computer, printer, display, CRT display, fax, copy, word processor, notebook computer, DVD drive, PD drive, floppy disk drive Storage device housings, relays, etc.
It can be widely used for electrical and electronic equipment parts such as switches, case members, transformer members, coil bobbins, etc., mechanical parts, automobile parts, and various other uses.

[0048]

The present invention will be described in more detail with reference to the following Examples, which do not limit the scope of the present invention.

The following ingredients were used in the examples. Polyolefin-based resin (polypropylene resin) "Tokuyama Polypro MS-670" manufactured by Tokuyama
C "Specific gravity = 0.90 (g / cc) MI = 23.0 (g / 10 min) Aluminum hydroxide manufactured by Showa Denko, trade name“ Heidilite H-42M ”Average secondary particle diameter = 1.0 μm Non-halogen phosphorus Acid ester (triphenyl phosphate) manufactured by Daihachi Chemical Industry Co., Ltd., trade name “TPP” In addition, all the compounding amounts in the examples are shown by weight parts.

The flame retardancy was evaluated by the UL-94 flammability test (thickness of test pieces 3.2 mm and 1.6 mm).
The mechanical properties were evaluated by Izod impact strength (kgf · cm / cm) according to JIS K-7110 test method.

Examples 1 to 6 A predetermined amount of polypropylene, aluminum hydroxide and triphenyl phosphate shown in Table 1 were melt-kneaded using a twin-screw extruder to obtain a resin composition. The obtained resin composition was molded by an injection molding machine, and test pieces for combustion test and mechanical property measurement were prepared, respectively, and the above items were evaluated. Table 1 shows the obtained results.
Shown in

[0052]

[Table 1]

(Comparative Examples 1 to 5) Tests for combustion test and measurement of mechanical properties were carried out in the same manner as in Examples 1 to 6, using predetermined amounts of polypropylene, aluminum hydroxide and triphenyl phosphate shown in Table 2. Pieces were made and evaluated. Table 2 shows the obtained results.

[0054]

[Table 2]

In Comparative Example 5, the compatibility of triphenyl phosphate with the polypropylene resin was poor, and bleed-out occurred. This means that workability and formability are poor. In Table 1, UL-94 (thickness 3.2 mm) and U
Both of the results of L-94 (1.6 mm in thickness) being "V-2" mean that the obtained resin composition has high flame retardancy.

Therefore, from the results of Examples (Table 1) and Comparative Examples (Table 2), it is understood that the flame-retardant polyolefin resin composition of the present invention has higher flame retardancy than the conventional one. You. Also, surprisingly, the flame-retardant polyolefin-based resin composition of the present invention has significantly improved mechanical properties as compared with the resin composition containing no aluminum hydroxide and triphenyl phosphate (Comparative Example 1). Let me.

[0057]

Industrial Applicability The flame-retardant polyolefin resin composition of the present invention does not generate corrosive gas or toxic gas such as halogen-based gas during molding and burning, and has excellent flame retardancy and mechanical properties. Since it has properties and does not contain halogen, there are almost no safety problems such as toxicity to humans and corrosiveness to equipment. Therefore, by utilizing these properties, it can be usefully used as a material for electric / electronic parts, mechanical parts, and automobile parts.

Claims (3)

[Claims] 1. An aluminum hydroxide and a non-halogen phosphate having a compounding ratio (weight ratio) of 2: 1 to 1: 2 with respect to 100 parts by weight of a polyolefin-based resin, the total amount of which is 25 to 45 parts by weight of a flame-retardant polyolefin resin composition. 2. The flame-retardant polyolefin resin composition according to claim 1, wherein the non-halogen phosphate is a monomeric phosphate. 3. The flame-retardant polyolefin resin composition according to claim 2, wherein the monomeric phosphate ester is triphenyl phosphate.