JP3159403B2 - Propylene resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a highly rigid and flame-retardant propylene-based resin composition.

[0002]

2. Description of the Related Art Polypropylene is used in various fields, but has a drawback that it is easy to ignite and burn. For this reason, various uses of flame retardancy are applied to flame retardancy. Among them, polypropylene used for electric products such as a TV back cover has been required to have high flame retardancy, for example, “V-0” according to US UL standard. Also, to increase the size of electrical products,
It is also required to increase the rigidity without impairing the fluidity and impact resistance of polypropylene.

[0003] In general, as a method of increasing the rigidity of polypropylene, there is a method of reinforcing with a filler. However, this method not only impairs other physical properties of polypropylene, but also depends on the type of flame retardant to be combined. In some cases, the conversion effect may be impaired. Among many flame retardants, decabromodiphenyl oxide is a good flame retardant whose flame retardant effect does not decrease even when combined with a filler, but recently its use has been restricted mainly in Europe due to the dioxin problem. In Japan, there are some restrictions on self-regulation.

[0004] As an alternative to high rigidity polypropylene, Po Ripuropire in to dibenzylidene sorbitol sorbitol represented, or p-t-butyl-nucleating agent aluminum salts typified by aluminum benzoate Is included. However, even in this case, if the flame retardant is mixed with the polypropylene which has been made highly rigid by the nucleating agent, the flame retarding effect of the flame retardant is inhibited by the nucleating agent, or the nucleating agent reacts with the flame retardant. And discoloration.

Thus, it has been difficult to obtain a highly rigid and flame-retardant polypropylene by combining a general crystal nucleating agent and a flame retardant.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to maintain a high flame retardancy of "V-0" or more in the U.S.A. It is to obtain a resin composition.

[0007]

Means for Solving the Problems The present inventors have intensively studied to solve the above problems. As a result, it has been found that, by combining a specific flame retardant and a crystal nucleating agent with polypropylene in combination, a highly rigid composition can be obtained without impairing high flame retardancy. Was completed.

That is, the present invention relates to (1) 100 parts by weight of polypropylene (2) 2,2-bis [4- (2,3-dibromopropoxy) -3,5-dibromophenyl] propane and / or bis [4 -(2,3-dibromopropoxy) -3,5-dibromophenyl] sulfone 8 to 15 parts by weight (3) Antimony trioxide 1 to 7 parts by weight (4)

[0009]

Embedded image

A propylene-based resin composition comprising 0.01 to 1 part by weight of a cyclic sodium phosphate represented by the following formula:

The polypropylene which is the component (1) of the propylene resin composition in the present invention includes a propylene homopolymer, propylene and an α-olefin such as ethylene, 1-butene, 1-pentene and 1-hexene. , 1-heptene, 4-methyl 1-pentene, and other random copolymers, block copolymers, or mixtures thereof can be used without particular limitation.

The component (2) of the present invention, 2,2
-Bis [4- (2,3-dibromopropoxy) -3,5
-Dibromophenyl] propane and bis [4- (2,
As for [3-dibromopropoxy) -3,5-dibromophenyl] sulfone, a commercially available product can be used without any particular limitation. 2,2-bis [4- (2,3-dibromopropoxy) -3,5-dibromophenyl] propane and / or bis [4- (2,3-dibromopropoxy) -3,
The amount of [5-dibromophenyl] sulfone (single amount when each of them is used alone, or the total amount when both are used together) is 8 to 15 parts by weight based on 100 parts by weight of polypropylene. Yes, preferably 9-1
3 parts by weight. When the amount is less than the above lower limit, sufficient flame retardancy cannot be obtained, and when the amount is more than the above upper limit, the flame retardant effect reaches a plateau, and the specific gravity increases and the heat stability increases. It is not preferable because it causes a decrease in properties and further a decrease in various physical properties.

As the antimony trioxide as the component (3) in the present invention, commercially available general ones can be used without any particular limitation. The compounding amount of antimony trioxide is 1 to 7 parts by weight, preferably 2 to 5 parts by weight based on 100 parts by weight of polypropylene. If the compounding amount of antimony trioxide is outside the above range, the same phenomenon as described in the component (2) occurs, which is not preferable.

The cyclic sodium phosphate as the component (4) in the present invention is represented by the following formula:

[0015]

Embedded image

(Where R is an alkyl group having 1 to 4 carbon atoms). Specific examples thereof include, for example, sodium 2,2-methylenebis (4,6-dimethylphenyl) phosphate, sodium 2,2-methylenebis (4,6-diethylphenyl) phosphate, Phosphoric acid-
2,2-methylenebis (4,6-dipropylphenyl)
Sodium, phosphate-2,2-methylenebis (4,6-
Di-t-butylphenyl) sodium and the like. The compounding amount of such a cyclic sodium phosphate is 0.01 to 1 part by weight, preferably 0.05 to 0.5 part by weight, based on 100 parts by weight of polypropylene. When the amount of the cyclic sodium phosphate is less than the above lower limit, sufficient rigidity cannot be obtained. Is not preferred.

The propylene-based resin composition of the present invention may further comprise, if necessary, conventionally known stabilizers, coloring agents, antistatic agents, lubricants, nucleating agents, flame retardancy, anti-blooming properties, and spinning. Various fillers and the like may be added as long as the properties are not adversely affected.

There are no particular restrictions on the order in which the components are mixed and the mixing method used when preparing the propylene-based resin composition of the present invention. Generally, a tumbler-type blender, a V-type blender,
This is performed by a conventional method using a Henschel mixer, a ribbon mixer, or the like.

[0019]

The propylene resin composition of the present invention has a high flame retardancy of "V-0" as well as a high rigidity according to the UL94 standard of the United States (the standard for a combustion test method for plastic materials). The reason why such an effect is obtained is not clear, but 2,2-bis [4- (2,3-dibromo) which acts as a flame retardant because cyclic sodium phosphate acting as a crystal nucleating agent has a cyclic structure. Propoxy)
-3,5-dibromophenyl] propane and bis [4
It is presumed that the reaction with-(2,3-dibromopropoxy) -3,5-dibromophenyl] sulfone is hindered, and as a result, the functions of the respective compounds are sufficiently exhibited.

[0020]

EXAMPLES The present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples. The symbols used in the examples and comparative examples are as follows.

1. Polypropylene (manufactured by Tokuyama Soda Co., Ltd.):
A): propylene homopolymer (melt flow rate 1)
B: Ethylene-propylene block copolymer (melt flow rate 18 g / 10 min, ethylene content 2.0)
wt%) 2. Flame retardant C: 2,2-bis [4- (2,3-dibromopropoxy) -3,5-dibromophenyl] propane (Fireguard 3100, manufactured by Teijin Chemicals Limited) D: bis [4- (2,3- Dibromopropoxy) -3,
5-dibromophenyl] sulfone (manufactured by Marubishi Yuka Kogyo Co., Ltd.
Nonenene PR-2) E: antimony trioxide Crystal nucleating agent F: pt-butyl aluminum benzoate G: dibenzylidene sorbitol H: 2,2-methylenebis (4,6-di-t-phosphate)
(Butylphenyl) sodium Examples and Comparative Examples The preparation and test methods of the propylene-based resin composition were performed as follows.

(1) Premix The flame retardant of Table 1 was added to 100 parts by weight of polypropylene.
A crystal nucleating agent and tetrakis [methylene-3- (3,5-
Di-t-butyl-4-hydroxyphenyl) propionate] methane (Irganox 10 manufactured by Ciba-Geigy)
10): 0.3 part by weight of tris (2,4-di -t- butyl-phenyl) phosphite (Ciba-Geigy Corp., Irgafos 168): 0.2 part by weight dilauryl thiodipropionate (Sumitomo Chemical Co., Made by Sumilizer TPL-
R): 0.3 parts by weight of calcium stearate (manufactured by Dainippon Ink Chemical Industry Co., Ltd.) were blended 0.1 part by weight, were premixed in a Henschel mixer.

(2) Pelletization The above mixture was pelletized using a 50 mmφ extruder.

(3) Preparation of Test Specimens Using the above pellets, a combustion test specimen was prepared using a 2 oz injection molding machine.
A bending test piece and a test piece for color tone observation were prepared.

(4) Effect test (a) Combustion test The flammability classification was determined by a combustion test based on UL Standard Sb94.

(A) Bending test The bending elastic modulus was measured by a bending test according to JIS K7203.

(C) Observation of color tone The color tone of each sample was visually observed.

[0028]

[Table 1]

Claims (1)

(57) [Claims] (1) Polypropylene
100 parts by weight (2) 2,2-bis [4- (2,3-dibromopropoxy) -3,5-dibromophenyl] propane and / or bis [4- (2,3-dibromopropoxy) -3,5 -Dibromophenyl] sulfone 8 to 15 parts by weight (3) Antimony trioxide 1 to 7 parts by weight (4) The following formula: A propylene-based resin composition comprising 0.01 to 1 part by weight of a cyclic sodium phosphate represented by the formula: