JP2001342304A - Non-halogen flame-retardant resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition which has an flame-retardancy equal to PVC resin composition, is excellent in mechanical characteristics, generates no toxic gas when incineration, and can be separated from a PVC resin composition by specific gravity. SOLUTION: The non-halogen flame-retardant resin composition comprises 100 pts. of a polyolefinic polymer and 20-50 pts. of a metallic hydroxide surface covered with a silicic acid compound by the sol-gel process, has a specific gravity of 1.14 or less and an oxygen index of 24-34, and passes a 60-degree inclined flame-retardant test of JIS C 3005.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has flame retardancy equivalent to that of a polyvinyl chloride (PVC) composition, has good mechanical properties, has a specific gravity smaller than that of a PVC composition, and is capable of fractionating specific gravity. The present invention relates to a halogen-free flame-retardant resin composition containing no halogen and capable of being incinerated.

[0002]

2. Description of the Related Art PVC compositions have good electrical insulation properties and are self-extinguishing, so that they can be used for wire coating materials, tubes, tapes, and the like.
Widely used for packaging and building materials. By the way, PV
Since the C composition contains chlorine, which is a halogen, corrosive gases such as hydrogen chloride and harmful gases such as dioxin are generated during combustion. For this reason, when various PVC products became waste, there was a problem that they could not be incinerated. Therefore, at present the landfill is done, but PVC
Since a lead-based stabilizer is used in the composition, there is also a problem that it is eluted into soil or the like, and it has become difficult to treat it as industrial waste.

On the other hand, if a halogen-free polyethylene, polypropylene or the like is used as a resin composition instead of the PVC composition, no harmful gas is generated at the time of combustion, so that incineration is possible. The resin composition containing no has a disadvantage that the flame retardancy is inferior to PVC. Therefore, in order to impart flame retardancy to a resin composition made of polyethylene, polypropylene, or the like, aluminum hydroxide, a halogen-free flame retardant,
Mixing of a metal hydroxide such as magnesium hydroxide has been performed.

However, in order to obtain flame retardancy equivalent to that of PVC, a large amount of metal hydroxide, for example, about 120 parts with respect to 100 parts (parts by weight, hereinafter the same) of the base polymer must be blended. In this case, the specific gravity of the resin composition is PV
C, and there is a problem that the specific gravity separation of plastic using water cannot be separated and recovered from PVC products. In addition, there is a disadvantage that the mechanical properties of the resin composition are reduced.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to have the same flame retardancy as a PVC resin composition, generate no harmful gas upon incineration, and separate the specific gravity from the PVC resin composition. Another object of the present invention is to obtain a resin composition having good mechanical properties.

[0006]

The object of the present invention is to provide a polyolefin polymer having 100 parts by weight coated with a silicate compound by a sol-gel method on a surface of 20 to 50 parts, a flame retardant auxiliary of 2 to 1 part.
0 parts, the specific gravity of the composition is 1.14 or less, the oxygen index is 24-34, and the composition is defined by JISC3005.
The problem is solved by a non-halogen flame-retardant resin material that passes the 0-degree tilt fuel test.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
Examples of the polyolefin-based polymer serving as the base polymer of the non-halogen flame-retardant resin composition of the present invention include polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene- One or two or more blend polymers such as butene 1 copolymer are used. Of these, ethylene-vinyl acetate copolymer and ethylene-ethyl acrylate copolymer are preferred.

[0008] As the non-halogen flame retardant used in the present invention, a metal hydroxide coated with a silicate compound by a sol-gel method is used. This is a metal hydroxide powder such as magnesium hydroxide, aluminum hydroxide and calcium hydroxide coated on the surface with a thin film of a silicate compound such as silicon oxide, sodium silicate and silicic acid. Oxide surface thickness 0.1-5μ
m coated with a silicate compound. The metal hydroxide subjected to the surface coating has a higher flame retardancy improving effect on the resin composition than the ordinary metal hydroxide, and a high flame retardancy can be obtained with a small amount of compounding. . The amount of the metal hydroxide subjected to the surface coating treatment is 20 to 50 parts, preferably 25 to 40 parts per 100 parts of the polyolefin-based polymer. If less than 20 parts, the flame retardancy is insufficient, and more than 50 parts. And the mechanical properties decrease.

The flame-retardant auxiliary may be one or a mixture of two or more of silicone-based flame retardants such as silicone powder and silicone gum, molybdenum compounds such as ammonium molybdate, red phosphorus, carbon black, and maleimide compounds. Is used. The amount of the flame retardant aid is 2 parts per 100 parts of the polyolefin polymer.
If the amount is less than 2 parts, the compounding effect cannot be obtained, and if the amount exceeds 10 parts, the flame retardant effect cannot be improved. This flame retardant aid imparts good flame retardancy to the resin composition, can reduce the blending amount of the above-mentioned surface-coated metal hydroxide, lowers the mechanical properties of the resin composition and reduces the specific gravity. An increase can be prevented.

The resin composition having such a composition has a specific gravity of 1.14 or less and an oxygen index of 24 or less.
３４34. When the specific gravity exceeds 1.14, the specific gravity approaches the specific gravity of the PVC composition, and it becomes impossible to separate the specific gravity from the PVC composition. If the oxygen index is less than 24, the flame retardancy is insufficient, and if it exceeds 34, a large amount of metal hydroxide must be blended, and the elongation of the composition and the like decrease. Furthermore, when this resin composition is used as a coating material for electric wires, cables or similar products, JI
It is necessary to pass the 60-degree inclined combustion test established in SC 3005.

[0011] The non-halogen flame-retardant resin composition includes:
In addition, various compounding agents such as an ultraviolet absorber, an antioxidant, a copper inhibitor, a coloring agent, and an inorganic filler can be compounded in appropriate amounts, but these compounds do not contain halogens and heavy metals. You should choose one. In addition, the non-halogen flame-retardant resin composition may be of a crosslinked type. For this purpose, a method of adding a crosslinking agent composed of an organic peroxide such as dicumyl peroxide in an amount of 0.5 to 2 parts per 100 parts of the base polymer, or adding and kneading a silane coupling agent and an organic peroxide, After forming the silane-grafted polyolefin-based polymer, there is a method of irradiating with silane crosslinking or electron beam or gamma ray which is crosslinked by being brought into contact with moisture after molding.

Such a non-halogen flame-retardant resin composition is used as an insulator, a sheath, an interposition, and the like of electric wires and cables by extrusion coating, and is also used to form sheets, films, pipes, and the like by extrusion molding, injection molding, and the like. Various products such as ducts and building materials can be used.

In the non-halogen flame-retardant resin composition of the present invention, the flame retardancy is almost equal to that of the PVC product, and the specific gravity is smaller than that of the PVC product, so that the specific gravity can be separated by water. Further, since it does not contain halogen, no harmful gas is generated even when incinerated. Furthermore, since a metal hydroxide coated with a silicate compound having a large flame-retardant effect and a flame-retardant aid is used, the amount of the metal hydroxide can be reduced, thereby increasing the specific gravity. The size can be further reduced, and the mechanical properties of the resin composition are slightly reduced. In addition, since heavy metals such as lead, cadmium, and chromium are not contained, soil and the like are not contaminated by these heavy metals even when incinerated.

A specific example will be described below. The composition shown in Table 1 was prepared, kneaded and molded by an extruder to prepare a 2 mm-thick sheet-like specimen. The specimen was measured for specific gravity, tensile strength, elongation, oxygen index, and flame retardancy by a 60-degree inclined combustion test defined in JIS C 3005. Table 1 shows the results. In Table 1, the EEA resin had an ethyl acrylate content of 19% by weight and a melt index of 1.5.
Of the ethylene-ethyl acrylate copolymer, magnesium hydroxide A, magnesium hydroxide surface-treated with a higher saturated fatty acid, and magnesium hydroxide B, magnesium hydroxide coated with a silicate compound by a sol-gel method. Inhibitors include pentaerythrityl-tetrakis [3
(3,5-di-t-butyl-4-hydroxyphenol) propionate].

[0015]

[Table 1]

From the results shown in Table 1, it can be seen that the test Nos. 1 to 4 have excellent flame retardancy and mechanical properties, and have a specific gravity of 1.14 or less.

[0017]

As described above, the non-halogen flame-retardant resin composition of the present invention has the same flame retardancy as the PVC composition, and also has the mechanical properties such as tensile strength and elongation. Good, no harmful gas generated during incineration,
Heavy metals such as lead and cadmium are not contained in the incineration residue. Furthermore, it can be separated from PVC products by specific gravity separation, and can be collected and recycled.

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Claims (1)

[Claims] 1. A metal oxide whose surface is coated with a silicate compound by a sol-gel method in an amount of 20 to 50 parts by weight, a flame-retardant aid 2-1 in 100 parts by weight of a polyolefin-based polymer.
A composition comprising 0 parts by weight, having a specific gravity of 1.14 or less, an oxygen index of 24-34,
JI when used as a coating material for cables or similar products
A non-halogen flame-retardant resin composition, which passes a 60-degree inclined combustion test established in SC 3005.