JP2001261900A - Nonhalogen flame-retardant resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide resin compositions which have the same level of high flame retardance and external flow-resistance as those of PVC compositions and do not generate a harmful gas upon incineration treatment and can carry out the fractionation by specific gravity with the PVS compositions. SOLUTION: The nonhalogen flame-retardant compositions comprise a polyolefin based polymer having about 1-15 wt.% polybutene-1, a metal hydroxide, and a silicone-based flame-retardant, and have a specific gravity of <=1.14, an oxygen index of >=25, and an abrasion wear of <=30%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has the same flame retardancy as a polyvinyl chloride (PVC) composition, and has a specific gravity of PVC.
The present invention relates to a non-halogen flame-retardant resin composition which is smaller than the composition, can be separated by specific gravity, does not contain halogen, and can be incinerated, and has particularly high trauma resistance.

[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 materials, building materials, etc. 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, landfill disposal is performed. However, since a lead-based stabilizer is used in the PVC composition, there is also a problem that this is eluted into soil and the like, and it is difficult to dispose of the waste as industrial waste. It has become to.

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 it can be incinerated. However, these resin compositions containing no halogen have a disadvantage that they are inferior in flame retardancy as compared with PVC compositions. Therefore, in order to impart flame retardancy to a resin composition composed of polyethylene, polypropylene, or the like, a metal hydroxide such as aluminum hydroxide or magnesium hydroxide is blended.

[0004] However, only with the above metal hydroxide,
In order to obtain the desired high flame retardancy, it is necessary to mix a large amount of this, and there has been a problem that the mechanical properties of the obtained resin composition are deteriorated. Further, the specific gravity of the resin composition to which a large amount of the metal hydroxide is added,
It may be about the same as the PVC composition, and the molded product obtained by molding the resin composition and the PVC product cannot be separated by specific gravity separation using water, and can be recycled. There was a problem that it could not be done. Furthermore, resins such as polyethylene and polypropylene have a problem in that the resin itself is soft, and a molded product obtained from the resin is inferior in trauma resistance to a PVC product.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has the same flame retardancy and trauma resistance as a PVC resin composition, and does not generate harmful gas upon incineration. Another object of the present invention is to obtain a resin composition that can be separated from a PVC resin composition by specific gravity.

[0006]

An object of the present invention is to provide a resin composition comprising a polyolefin polymer containing polybutene-1, a metal hydroxide, and a silicone flame retardant. The problem is solved by a non-halogen flame-retardant resin composition having a specific gravity of 1.14 or less, an oxygen index of 25 or more, and a wear amount of 30% or less. The blending amount of polybutene-1 in the polyolefin-based polymer is desirably 1 to 15% by weight.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The polyolefin-based polymer serving as the base polymer of the non-halogenated flame-retardant resin composition of the present invention contains polybutene-1 as an essential component. The content of polybutene-1 in the polyolefin polymer is desirably 1 to 15% by weight. If the content is less than 1% by weight, rigidity cannot be improved, and wear resistance and trauma resistance tend to be inferior.
If it exceeds, the flame retardancy tends to decrease.

The polyolefin resins other than the above polybutene-1 include polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-ethylene acrylate copolymer and ethylene-butene 1 copolymer. Blend polymers obtained by blending one or two or more such as coalescing are used.

Metal hydroxides as halogen-free flame retardants include magnesium hydroxide, aluminum hydroxide, calcium hydroxide, and metal hydroxides coated with higher fatty acids, silane coupling agents, molybdates and the like. A treated surface-treated metal hydroxide is used. The compounding amount of the metal hydroxide is 10
The amount is about 30 to 130 parts by weight, preferably about 50 to 100 parts by weight with respect to 0 parts by weight. If the amount is less than 30 parts by weight, the flame retardancy tends to be inferior. If the amount exceeds 130 parts by weight, the mechanical characteristics tend to decrease.

[0010] As a flame retardant auxiliary, a silicone flame retardant is blended. As the silicone-based flame retardant, a polymeric silicone compound such as silicone powder or gum-like silicone is used, and its compounding amount is about 1 to 30 parts by weight, preferably 5 to 20 parts by weight, per 100 parts by weight of the polyolefin-based polymer. It is about parts by weight. If the amount is less than 1 part by weight, the flame retardancy cannot be improved, and if the amount exceeds 30 parts by weight, the effect of improving the flame retardancy cannot be obtained only by increasing the raw material cost. This silicone-based flame retardant imparts good flame retardancy, can reduce the amount of metal hydroxide compounded, and thus can prevent a decrease in mechanical properties.

Further, a flame retardant auxiliary other than the silicone flame retardant may be blended. As the flame retardant aid, molybdenum compounds such as ammonium molybdate, red phosphorus, carbon black, a maleimide compound and the like are used, and the compounding amount thereof is about 1 to 30 parts by weight based on 100 parts by weight of the polyolefin-based polymer. And preferably about 5 to 20 parts by weight.

The resin composition having such a composition has a specific gravity of 1.14 or less and an oxygen index of 25 or less.
As described above, the wear amount needs to be 30% or less. When the specific gravity exceeds 1.14, the specific gravity approaches the specific gravity of the PVC composition, and the specific gravity cannot be separated from the PVC composition. When the oxygen index is less than 25,
It is inferior in flame retardancy.

On the other hand, when the wear amount exceeds 30%, the wound resistance becomes poor. The amount of wear in the present invention is JASO
D611-86 (automotive thin-walled low-voltage wire) is a test performed in accordance with the 1.1 abrasion reciprocation method of 1.1 abrasion resistance test. The test conditions were as follows: load 800 g, number of reciprocations 15
The test is performed 00 times with a radius (R) of the blade of 0.4 mm, and the thickness ratio of the sample before and after the wear resistance test is determined to calculate the wear amount (%).

The non-halogen flame-retardant resin composition includes:
In addition, UV absorbers, anti-aging agents, copper damage inhibitors,
Various compounding agents such as a coloring agent and an inorganic filler can be mixed in an appropriate amount, but these compounding agents should be selected from those containing no halogen or heavy metal. In addition, the non-halogen flame-retardant resin composition may be of a crosslinked type. For this purpose, a crosslinking agent comprising an organic peroxide such as dicumyl peroxide is added in an amount of about 0.1 to 5 parts by weight, preferably about 0.5 to 3 parts by weight, based on 100 parts by weight of the polyolefin polymer. Or adding and kneading an organic peroxide as a silane coupling agent to form a silane-grafted polyolefin-based polymer, and then, after molding, irradiating with silane crosslinking, which is cross-linked by contacting with moisture, electron beam, or gamma ray. There is a way.

Such a non-halogen flame-retardant resin composition is used as an insulator for electric wires and cables, a sheath, an interposition, and the like by extrusion coating, and a sheet, film, or the like by extrusion molding, injection molding, or the like. It can be a molded product such as a pipe, a duct, and a building material.

The molded article thus obtained contains polybutene-1 as an essential component of the polyolefin-based polymer serving as the base polymer, so that it has high rigidity and is resistant to trauma and abrasion. It is excellent. In addition, it has a self-extinguishing flame retardancy similar to that of a PVC product with an oxygen index of 25 or more. Further, since the specific gravity is 1.14 or less, which is smaller than that of the PVC product, it can be separated and recovered from the PVC product by specific gravity separation using water. Further, when the wear amount is 30% or less, it is excellent in external damage resistance. Further, since it does not contain halogen, it can be incinerated without generating harmful gas even when incinerated, and does not generate toxic gas even in case of fire. Further, since it does not contain heavy metals such as lead, cadmium, and chromium, the soil and the like are not contaminated by these heavy metals, and can be disposed of in a landfill.

[0017]

The present invention will be described below more specifically with reference to examples. These examples show one embodiment of the present invention, and do not limit the present invention, and can be arbitrarily changed within the scope of the present invention. (Examples 1 to 3, and Comparative Examples 1 to 4) A resin composition having the composition shown in Table 1 was prepared, kneaded and molded by an extruder,
A sheet-shaped test piece having a thickness of 2 mm was prepared. The specific gravity, tensile strength, tensile elongation, Shore A hardness, oxygen index, and abrasion loss of this sample were measured according to the following methods, and the results are shown in Table 2.

(1) Tensile strength Measured according to JIS K6760. (2) Tensile elongation Measured in accordance with JIS K6760. (3) Shore A hardness Measurement was performed in accordance with JIS K6253. (4) Oxygen index Measured according to JIS K7201. (5) Amount of wear As described above, the measurement was performed in accordance with the 11.2 blade reciprocation method of the 1.1 wear resistance test of JASO D611-86.

[0019]

[Table 1]

In Table 1, a mixture of an EVA resin and polybutene-1 was used as the polyolefin polymer, and the EVA resin had a vinyl acetate content of 28% by weight.
Was used. Also,
Pentaerythritol tetrakis as an anti-aging agent
[3- (3,5-Di-tert-butyl-4-hydroxyphenyl) propionate] was used.

[0021]

[Table 2]

From the results shown in Table 2, the test pieces obtained in Examples 1 to 3 have a specific gravity of 1.14 or less, an oxygen index of 30 or more, are highly flame-retardant, and have a wear amount of 29 or less. % Or less and excellent in scratch resistance. On the other hand, Comparative Example 1
The test pieces obtained in the above were inferior in flame retardancy and trauma resistance. Further, the product obtained in Comparative Example 2 was inferior to the trauma resistance and had a specific gravity similar to that of the PVC product.
In addition, the one obtained in Comparative Example 3 was inferior in trauma resistance, and the one obtained in Comparative Example 4 was inferior in flame retardancy.

[0023]

As described above, the non-halogen flame-retardant resin composition of the present invention has the same flame retardancy and trauma resistance as the PVC composition, and has a halogen-free property. Since it does not contain, no harmful gas is generated at the time of incineration, and the incineration residue does not contain heavy metals such as lead and cadmium. Furthermore, a molded product obtained by molding the resin composition can be separated from a PVC product by specific gravity separation, and can be collected and recycled.

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Claims (2)

[Claims] 1. A resin composition comprising a polyolefin polymer containing polybutene-1, a metal hydroxide, and a silicone flame retardant, wherein the specific gravity of the resin composition is 1.14 or less, Index is 25 or more, wear amount is 30
% Or less, a non-halogen flame-retardant resin composition. 2. The non-halogen flame-retardant resin composition according to claim 1, wherein the content of polybutene-1 in the polyolefin-based polymer is 1 to 15% by weight.