JPS59202243A - Flame-retardant polyolefin resin composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. which has excellent flame retardance and does not emit any corrosive gas because no halogen flame retarders are used, by blending a specified hydrrated inorg. material, antimony trioxide and a molybdenum compd. with a polyolefin resin. CONSTITUTION:50-200pts.wt. hydrated inorg. material component (A) selected from among aluminum hydroxide, magnesium hydroxide, hydrotalcite and mixtures thereof, 10-150pts.wt. antimony trioxide (B) and 1-50pts.wt. molybdenum compd. (C) are mixed with 100pts.wt. polyolefin (D) such as polyethylene or polypropylene to obtain a flame-retardant polyolefin resin compsn. Examples of the molybdenum compds. are molybdenum trioxide, molybdenum hydroxide, molybdenum disulfide and ammonium molybdate.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel flame retardant polyolefin resin composition.

Traditionally, halogen-based flame retardants have been commonly used to make polyolefin resins flame retardant;
Compositions containing refueling agents generate a large amount of smoke when burned, and generate toxic and corrosive gases such as hydrogen chloride, so there is a risk of personal injury or equipment corrosion in the event of a fire. it was high.

As a flame retardant method for resins that does not generate poisonous or edible gases when burned, it has been proposed to use inorganic compounds containing water of crystallization, but in this case, the flame retardant effect of water-containing inorganics is extremely weak. Therefore, the desired flame retardancy could not be obtained unless a very large amount was blended. For this reason, highly flame-retardant resin compositions made of hydrated inorganic substances suffer from various problems when blending a large amount of hydrated inorganic substances, such as a decrease in compounding workability, moldability, etc., and a decrease in mechanical properties such as mechanical strength. .

The present invention has focused on this point, and as a result of intensive studies, it has been found that flame retardancy is improved due to the favorable synergistic effect of additives, thereby reducing the approved blending amount of flame retardant. The idea was to solve the problem, and the gist of this was to use one hydrated inorganic substance selected from aluminum hydroxide, magnesium hydroxide, and hydrotalcite per 100 parts by weight of polyolefin resin.

50 to 200 parts by weight of a mixture of two or more types, 10 to 150 parts by weight of antimony trioxide, 1 to 50 parts by weight of a molybdenum compound
This is a flammable polyolefin resin composition characterized in that it contains parts by weight.

The polyolefin resin referred to in the present invention includes, for example, polyethylene, polypropylene, polybutene, 4-methylpentene-1 polymer, ethylene/vinyl acetate copolymer, ethylene/ethyl acrylate copolymer, ethylene/propylene copolymer, ethylene/ It is a blend of one or more types of propylene/diene terpolymer, and also includes crosslinked products thereof.

In addition, molybdenum compounds are not particularly limited, but include
For example, molybdenum trioxide, molybdenum hydroxide (Vl)
, molybdenum disulfide, molybdenum oxide acetylacetate]・
Nate, ammonium molybdate, potassium molybdate, calcium molybdate, sodium molybdate, etc. are easily available and common.

In the present invention, the content of the additives is limited to 50 to 200 parts by weight of the hydrated inorganic substance, 10 to 150 parts by weight of antimony trioxide, and 1 to 50 parts by weight of the molybdenum compound, based on 100 parts by weight of the polyolefin resin. If the amount of these additives is less than the lower limit, the flame retardant effect on the polyolefin resin will be weak (and if the amount exceeds the upper limit, the effect will be saturated and there will be no economic benefit). This is because the mechanical strength of the composition decreases significantly.

In addition to these components, the resin composition of the present invention may contain crosslinking agents, lubricants, antioxidants, ultraviolet absorbers, colorants, fillers, and the like, if necessary.

Examples of the flame retardant resin composition of the present invention are shown below together with comparative examples.

Regarding the compounding ratios listed in Table 1, each was heated in an open roll at 100°C for about 30 minutes to form a belt-shaped sheet, and then press-molded at 160°C for 5 minutes to obtain a composition sheet. UL-94 combustion test samples and JISK 6301 low-temperature impact embrittlement test samples were prepared and cut into specified shapes.The test results obtained for these samples are also shown in Table 0.
I did it myself.

As is clear from the table, when red sea bream sium hydroxide and aluminum hydroxide are used alone (Comparative Examples I and 2), even when 250 parts by weight are added to 100 parts by weight of the base resin, the UL is still high.
Based on the provisions of -94, <Min fuel level will not become V-O. Moreover, even if these hydrated inorganic substances &t1m antimony trioxide or molybdenum trioxide are added alone (Comparative Example 3
, 4) The degree of burnout does not become V-O. However, Example 1.2.3. Although the total amount of additives to the resin is much smaller than that of Comparative Example 1.2.3.4 as shown by s, the flame retardance of the example compositions is ranked ■-〇. . This indicates that there is a favorable synergistic effect among the three specified additives, namely the hydrated inorganic substance, antimono trioxide, and the molybdenum compound. However, as shown in Comparative Example 5, sufficient flame retardancy cannot be obtained if the amounts of antimony trioxide and molybdenum compounds are too small. On the other hand, focusing on the impact embrittlement temperature, Example 1.2.
The impact embrittlement temperature of 3.5 was all good at -15°C. Furthermore, the impact hardening temperature of Comparative Examples 1 and 2, in which 250 parts by weight of aluminum hydroxide or magnesium hydroxide was added to 100 parts by weight of the resin, was +IO"C.
On the other hand, there is an advantage that the impact embrittlement temperature of Example 4, which has a larger total amount of additives to the resin, is lower. The reason for this is not clear, but it is presumed to be due to the volume effect of the compounding agents, which is caused by the specific gravity of antimony trioxide, molybdenum trioxide, and molybdenum disulfide being larger than that of aluminum hydroxide and magnesium hydroxide.

As is clear from the examples above, the flame-retardant polyolefin resin composition of the present invention does not impair the inherent mechanical strength of the striped polyolefin resin, and because it does not use any halogen-based flame retardant as in the past, It is a polyolefin resin composition that does not generate corrosive gas or large amounts of smoke, and has unprecedented flame retardancy, and its industrial value is extremely high.

Continuation of page 1 0 shots by Shun Fujimura Hiratsuka City Higashihe Hata 5-1-9 Old Manufactured by Kawa Denki Kogyo Co., Ltd. Hiratsuka Electric Wire Co., Ltd. Inside the factory

Claims (1)

[Claims] (1) For 100 parts by weight of polyolefin resin,
50 to 200 parts by weight of a hydrated inorganic substance such as aluminum hydroxide, magnesium hydroxide, or hydrotalcite, 10 to 150 parts by weight of antimony dioxide
1. A flame-retardant polyolefin resin composition comprising 1 to 50 parts by weight of a molybdenum compound.