JPH04202341A - Flame-resistant polypropylene composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a flame-retardant polypropylene composition that eliminates odor caused by the flame retardant it contains.

[Prior Art] Since polypropylene has the disadvantage of being easily ignited and combustible, various flame retardant treatments have been applied to it.

In particular, polypropylene used in electrical products, building materials, etc. is increasingly required to have a higher degree of flame retardancy. For example, the UL standard in the United States requires parts of home appliances such as the outer frame of a television to have a high degree of flame retardancy of V-1 to V-O.

Therefore, products exported to the United States, such as home appliances, must be given a flame retardant rating of V-1-V-0. In addition, in recent years, in Japan, there have been many incidents of TVs being burned, so home appliance manufacturers have decided to make their TVs highly flame retardant (V-0) as a voluntary regulation. Furthermore, in China, the Middle East, and parts of Europe, IEC (International Elec.
Flame retardancy is also regulated by the trochemical standards.

Conventionally, in making polypropylene flame retardant,
Although various flame retardants have been studied and proposed, etherified tetrabrominated bisphenol S is cited as a preferred flame retardant for parts of home appliances, such as the back covers of televisions mentioned above. However, when polypropylene containing etherified tetrabrominated bisphenol S as a flame retardant is used for the back cover of a television, etc., there is a problem in that it generates an unpleasant odor when the temperature is high, such as when the television is used.

[Means for solving problems]

The present inventors have carried out intensive development to solve the problem of unpleasant odor in polypropylene using ether tetrabrominated bisphenol S as a flame retardant, and as a result, have come to provide the present invention. That is, according to the present invention, based on 100 parts by weight of polypropylene, a compound represented by the following general formula (wherein R1 and R2 are an alkyl group bonding at least two bromine atoms of the same or different types, respectively) is used. 1 to 2 etherified tetrabrominated bisphenol S
0 parts by weight, 0.3 to 20 parts by weight of antimony trioxide, and 0 parts of an inorganic deodorant with thermal stability above 200°C.
．． It is a flame retardant polypropylene composition blended in a proportion of 1 to 2 parts by weight.

The polypropylene used in the present invention is a homopolymer of propylene, or a random mixture of α-olefin such as ethylene or butylene and propylene.

Block copolymers or mixtures thereof can be mentioned.

Further, the etherified tetrabrominated bisphenol S used in the present invention is represented by the general formula below, where R1 and R2 are an alkyl group bonding at least two or more bromine atoms of the same or different types. The number of carbon atoms is not particularly limited, and the number of carbon atoms is 2 to 20, preferably 2 to 5, and the greater the number of bromine atoms bonded to it, the better the flame retardant effect.

Specifically, in general, for example, bisphenol tetrabromide S bis(dibromoethyl ether), bisphenol tetrabromide S
Bis(dibromopropyl ether).

Bisphenol S tetrabromide (dibromobutyl ether), bisphenol S tetrabromide (tribromopropyl ether), bisphenol S tetrabromide (tetrabromopropyl ether), bisphenol S tetrabromide (bis tetrabromide
tribromobutyl ether), tetrabrominated bisphenol S
Tetrabrominated bisphenol S bis(polybromoalkyl ether) such as bis(tetrabromobutyl ether) is preferably used.

The amount of etherified tetrabrominated bisphenol S in the polypropylene composition of the present invention is generally 1 to 20 parts by weight, preferably 1.
The amount is 2 to 15 parts by weight. That is, the amount of etherified tetrabrominated bisphenol S in the polypropylene composition is
If the amount is less than the lower limit (1 part by weight), sufficient flame retardancy will not be obtained, and if it is more than the upper limit (20 parts by weight), thermal stability will decrease during melt-kneading. , which is not preferable because it tends to cause decomposition.

Furthermore, as the antimony trioxide used in the present invention, any commercially available antimony trioxide can be used as a flame retardant additive without any particular restriction. The amount of antimony dioxide to be blended is 0.3 to 20 parts by weight, preferably 0.5 to 15 parts by weight, per 100 parts by weight of polypropylene. That is, if the amount of antimony trioxide in the polypropylene resin composition is less than the above lower limit, sufficient flame retardancy will not be obtained, and if it is more than the above upper limit, no improvement in flame retardance will be observed. Moreover, the specific gravity increases and the impact resistance decreases, which is undesirable.

The inorganic system that is thermally stable at a temperature of 200°C used in the present invention does not thermally decompose when mixed with polypropylene and kneaded with etherified tetrabrominated bisphenol S. absorbs odors,
There is no particular restriction as long as it can be removed and deodorized. Such inorganic deodorants generally include metal oxides,
One or more types are appropriately selected from salts such as metal carbonates and metal hydroxides, their double salts, complex salts, and coordination compounds. Among these, porous deodorants containing Ae+Si+''g as a main component are particularly preferably used.Activated clay may also be added to these deodorants, if necessary.

A porous adsorbent such as zeolite can also be used.

The blending amount of the deodorant described above is such that polypropylene 100%
o, ooi parts by weight, preferably 0.00 parts by weight
The upper limit is generally 0.5 parts by weight, preferably 0.1 parts by weight, since 3 parts by weight is required, and if the amount is too large, flame retardancy will be adversely affected.

The polypropylene composition of the present invention may optionally contain conventionally known stabilizers, 9 colorants, antistatic agents, lubricants, nucleating agents, and flame retardant properties. etc. may be added.

The blending order and mixing method of each component to prepare the polypropylene composition of the present invention are not particularly limited.

This is carried out by a conventional method using a Henschel mixer, a ribbon mixer, or the like.

〔effect〕

The polypropylene composition of the present invention has self-extinguishing properties according to the IEC standard and high flame retardancy of V-2, V-1 to VO according to the UL94 standard (flammability test method standard for plastic and wood materials), and It does not generate any unpleasant odor caused by the flame retardant, etherified tetrabrominated bisphenol S. Therefore, the polypropylene composition of the present invention is suitably applied to frame parts of electrical appliances, such as television shells, which require flame retardancy and are exposed to high temperatures.

〔Example〕

EXAMPLES In order to specifically explain the present invention, Examples and Comparative Examples will be given and explained below, but the present invention is not limited to these Examples.

In addition, the results of the combustion tests shown in the examples and comparative examples are
Measurements were made based on L standards and IEC standards. In addition, the odor was measured by injection molding using 3 Tsuru X 12.
250mjl of 20 test pieces of 5 cranes x 60 pieces! The sample was placed in a wide-open container, tightly capped, and placed in an oven at 80"C for 2 hours, after which a sensory odor test was conducted using the olfactory senses of several people.

Example 1 As shown in Table 1, as polypropylene, a proco polymer with ethylene (PN670) having an Ml of 23 and a homopolymer (PN670) having an MI of 9, both manufactured by Tokuyama Soda ■, were used.
PN240), nonnene PR-2 (trade name), which is tetrabrominated bisphenol S bis (dibromopropyl ether) manufactured by Maru IE Yuka, commercially available antimony trioxide, and various deodorants were added together with a heat stabilizer. A fixed amount was added and mixed using a super mixer. The heat stabilizer is Irgaphos 168 (trade name) manufactured by Ciba Geigy,
Irganox 1010 (trade name) and calcium stearate were each added to the total composition at a concentration of 0.1%.

Next, the mixture was melt-kneaded using a 50 m/m-shaft extruder and pelletized. Furthermore, this pellet was molded using a 2oz injection molding machine, and a combustion test piece (l/16 inch thickness) was prepared.
and odor sensory test pieces were obtained, and each UL standard (hereinafter referred to as U
It was used to measure the flammability and odor according to the IEC standards (abbreviated as L) and/or IEC standards (hereinafter abbreviated as IEC). The results are also listed in Table 1.

In addition, the deodorants (A-1 to A-6) shown in Table 1 are Af
Kaseylite (trade name) is a porous inorganic deodorant whose main components are Si, Mg, and deodorant
1 to B-6) are commercially available organic deodorants.

Claims (1)

[Claims] 1. For 100 parts by weight of polypropylene, there are the following general formula ▲ mathematical formula, chemical formula, table, etc. ▼ (However, R_1 and R_2 in the formula represent at least two of the same or different types, respectively. 1 to 2 etherified tetrabrominated bisphenol S represented by
0 parts by weight, 0.3 to 20 parts by weight of antimony trioxide, and 0 parts of an inorganic deodorant with thermal stability above 200°C.
．． A polypropylene composition blended in a proportion of 1 to 2 parts by weight.