JPH03200852A - Flame-retardant resin 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 "Field of Industrial Application" The present invention relates to a flame-retardant resin composition mainly composed of a polyolefin polymer, which is used as a coating material for electric wires, cables, etc., a connecting material, and the like.

"Conventional technology" One of the flame retardant technologies for making polyolefin polymers flame retardant is to add hydrous inorganic fillers such as aluminum hydroxide and magnesium hydroxide to polyolefin polymers such as polyethylene and polypropylene. What it does is known.

Products containing this hydrous inorganic filler have the advantage of not emitting harmful halogen-containing gases during combustion, but in order to obtain sufficient flame retardancy, it is necessary to add a large amount of the hydrous inorganic filler. However, if added in large amounts, mechanical properties such as tensile properties and cold resistance may deteriorate.

``Problem to be Solved by the Invention'' Therefore, the problem to be solved by the present invention is to provide a flame-retardant resin composition based on a polyolefin polymer that has sufficient flame retardancy and has good mechanical properties and cold resistance. Our goal is to provide the following.

"Means for Solving the Problems" In this invention, the above problems are solved by blending 0.1 to 100 parts by weight of a 1,2-polybutadiene thermoplastic elastomer to 100 parts by weight of a polyolefin polymer. I made it.

The present invention will be explained in detail below.

As the polyolefin polymer in this invention,
High-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLD
α-olefin homopolymers such as polyethylene, polypropylene, polybutene-1, poly4-methylpentene-1, etc. Ethylene-ethyl acrylate copolymer (EEA), ethylene-vinyl acetate copolymer (E)
copolymer of ethylene and other seven polymers such as ethylene-acrylic acid copolymer (EAA), ethylene-propylene copolymer, ethylene-butene-1 copolymer, and ethylene-propylene-diene copolymer. A single polymer or a blend of multiple polymers can be used.

In addition, the 1,2-polybutadiene thermoplastic elastomer used in this invention has 90% of 1,2-bonds.
With the above, the molecular weight is 100,000 to several 100,000, and the crystallinity is 15 to 100,000.
A low-crystalline thermoplastic elastomer having a 35% syndiotactic structure and having rubber-like properties with an elongation of 300% or more is used. Specific examples of this elastomer include rJSRRB805j,
rJSRRBllo”, rJSRRB820J, rJ
sRRB830J, rJsRRB840'' (trade name, manufactured by Japan Synthetic Rubber), etc.

This elastomer has good compatibility with the above-mentioned polyolefin polymer and forms a uniform composition.

The blending amount of the 1,2-polybutadiene thermoplastic elastomer is 0.1 to 100 parts by weight per 100 parts by weight of the polyolefin polymer.

If it is less than 0.1 part by weight, no improvement in flame retardancy is observed;
If the amount exceeds 1 part by weight, the properties of the base polyolefin polymer will be impaired.

Further, in the flame retardant resin composition of the present invention, other flame retardants can be further added. Examples of such flame retardants include aluminum hydroxide, magnesium hydroxide, red phosphorus, and carbon black.

Furthermore, an inorganic flame retardant, a softener, a coloring agent, an anti-aging agent, a stabilizer, etc. can be appropriately added to this flame-retardant resin composition, if necessary.

Such a flame-retardant resin composition has good flame retardancy and no deterioration in mechanical properties such as tensile properties or temperature properties such as cold resistance, and has excellent physical properties. . The flame retardant mechanism of the l,2-polybutadiene thermoplastic elastomer is unknown, but it captures radicals generated from the polyolefin polymer during combustion, suppresses the lowering of the molecular weight of the polyolefin polymer, and achieves flame retardancy. It is expected that Therefore, when a flame retardant based on another flame retardant mechanism is used in combination, the flame retardant effect can be further enhanced.

Since the 1,2-polybutadiene thermoplastic ff-lastomer has good compatibility with the polyolefin polymer, it does not ooze out onto the surface of the molded product.

Hereinafter, specific examples will be shown and the functions and effects will be explained in detail.

"Example" A resin composition having the composition shown in Table 1 was prepared and extruded to obtain a sheet-like specimen.

The oxygen index, tensile strength, f-resistance, and embrittlement temperature (tit coldness) of this sample were measured.

The results are also shown in Table 1.

As is clear from Table 1, the flame-retardant resin composition of the present invention has good flame retardancy, mechanical properties, and temperature properties.

"Effects of the Invention" As explained above, the flame-retardant resin composition of the present invention has 1,2-
Polybutadiene thermoplastic elastomer from 0.1 to 10
Since it contains 0 parts by weight, it has excellent flame retardancy and good mechanical properties and cold resistance. In addition, since the compatibility is good, even if a large amount of 1,2-
The polybutadiene thermoplastic elastomer does not ooze out onto the surface of the molded product.

Claims (1)

[Claims] 1,2 parts per 100 parts by weight of polyolefin polymer
- 0.1 to 1 polybutadiene thermoplastic elastomer
1. A flame-retardant resin composition characterized by containing 0.00 parts by weight.