JPH1180474A - Flame-retardant hardly smoking vinyl chloride resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vinyl chloride resin compsn. which is highly flame- retardant and hardly generates smoke when burned by compounding a vinyl chloride polymer with specified amts. of zinc hydroxystannate and zinc borate. SOLUTION: This compsn. is prepd. by compounding 100 pts.wt. vinyl chloride polymer (e.g. PVC) with 1-20 pts.wt. zinc hydroxystannate and 5-30 pts.wt. zinc borate. The compsn. is further compounded with 30-60 pts.wt. plasticizer (e.g. dioctyl phthalate), 2-10 pts.wt. stabilizer (e.g. tribasic lead sulfate and lead stearate) and 5-100 pts.wt. filter (e.g. calcium carbonate) as required. Zinc of zinc hydroxystannate catalyzes the dehydrohalogenation of the polymer to accelerate the formation of a carbonized layer; thus, the generation of smoke is suppressed and the burning temp. is reduced by the endothermic reaction due to the volatilization of water generated by thermal decomposition. Zinc borate forms a glassy film and shuts off the supply of oxygen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant low-smoke-producing vinyl chloride resin composition.

[0002]

2. Description of the Related Art A vinyl chloride resin is inferior in stability to heat and light, so that a flame retardant is blended for improving flame retardancy. Antimony trioxide is often used as a flame retardant. Antimony trioxide has excellent flame retardancy, but has a drawback that once it starts burning, it generates a large amount of smoke. This drawback hinders evacuation and digestion during a fire, and may lead to secondary disasters. Therefore, in recent years, a flame-retardant material having low smoke emission has been demanded.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a vinyl chloride resin composition having high flame retardancy during combustion and low smoke emission.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a method for preparing zinc hydroxystannate from 100 parts by weight of a vinyl chloride polymer.
The present invention relates to a flame-retardant low-smoke-producing vinyl chloride resin composition characterized by comprising 5 parts by weight and 5 to 30 parts by weight of zinc borate.

[0005] The flame-retardant low-smoke-producing vinyl chloride resin composition of the present invention (hereinafter also referred to as the "composition of the present invention") comprises a vinyl chloride polymer and specific amounts of zinc hydroxystannate and zinc borate. . The feature of the present invention is that zinc hydroxystannate and zinc borate are used in combination instead of antimony trioxide, and the action and reaction mechanism of each component are considered as follows. In other words, zinc hydroxystannate promotes the formation of a carbonized layer as a catalyst for the dehydrohalogenation reaction of a vinyl chloride-based polymer, suppresses the generation of smoke, and burns the endothermic reaction due to the volatilization of moisture due to thermal decomposition. Has the function of lowering the temperature. Further, it is considered that zinc borate forms a glassy film and shuts off the supply of oxygen. When both are used in combination, a large flame retarding and smoke suppressing effect can be obtained due to a synergistic effect. In addition to the above components, the composition of the present invention may generally contain a plasticizer, a stabilizer, a filler, an antioxidant, an ultraviolet absorber, a pigment, and the like. For example, for 100 parts by weight of a vinyl chloride-based polymer, the plasticizer is 30 to
60 parts by weight, 2 to 10 parts by weight of stabilizer, 5 to 1 parts of filler
Preferably, it contains 00 parts by weight. Examples of the vinyl chloride polymer, plasticizer, stabilizer, filler, and the like used in the composition of the present invention include the following known ones.

[0006] The vinyl chloride-based polymer includes a homopolymer of vinyl chloride, that is, a polyvinyl chloride (PVC), and a copolymer with another copolymerizable monomer. Alternatively, all of them can be a copolymer thereof. Examples of the monomer constituting the copolymer include at least one selected from ethylene, vinyl acetate, acrylic acid, acrylate, and the like. As PVC, usually, the average degree of polymerization p = 1000-
2500. Examples of the plasticizer include phthalic acid esters such as dioctyl phthalate (DO)
P), diisononyl phthalate (DINP), diisodecyl phthalate (DIDP), diundecyl phthalate (DUP), etc .;
Trioctyl trimellitate (TOTM), trinormal octyl trimellitate (TnOTM), etc., and high molecular weight plasticizers such as polyesters, for example, adipic acid-based polyester [trade name: PN-350 (Asahi Denka Co., Ltd.)
), PN-250 (manufactured by Asahi Denka Co., Ltd.), etc.), epoxy type (for example, epoxidized soybean oil, epoxidized linseed oil [trade name: O-130P (manufactured by Asahi Denka Co., Ltd.)), O- 18
0A (manufactured by Asahi Denka Co., Ltd.)]) and the like.

[0007] Pb-based (eg, tribasic lead sulfate, lead stearate), Ba-Zn-based (eg,
Product name: MARK RAP-14 (manufactured by Asahi Denka Co., Ltd.),
MARK AC-186 (manufactured by Asahi Denka Co., Ltd.)]), C
a-Zn type (for example, [trade name: MARK 593 (manufactured by Asahi Denka Co., Ltd.)), MARK SP-70 (Asahi Denka Co., Ltd.)
Manufactured), Shinaka Red NLC (manufactured by Shinagawa Kako Co., Ltd.)
Etc.)), Ca-based (for example, calcium stearate),
Zn-based (for example, zinc stearate), Sn-based (for example, dinormal octyltin mercapto, methyltin mercapto [trade name: MARK465 (manufactured by Asahi Denka Co., Ltd.)), M
ARK 1920 (manufactured by Asahi Denka Co., Ltd.)]).

[0008] Examples of the filler include calcium carbonate, calcined clay, magnesium hydroxide, talc, silica and the like. The use of the composition of the present invention is not particularly limited and is widely used for structural members, protective members and the like. For example, as structural members, members for transportation equipment such as vehicles, aircraft, ships, etc., interior and exterior materials of buildings, furniture, office tools, home appliances and electronic members, etc., and as protective members, protective materials for flammable products And insulating materials such as electric wires and cables, and protective materials such as sheaths. The resin of the composition of the present invention,
Obtained by uniformly dispersing and mixing the above components,
And the molding process of the obtained resin into members or materials,
A conventionally known method is applied. For example, when extruding, the cylinder temperature may be 170 to 190 ° C.

[0009]

Hereinafter, specific examples of the present invention will be described.
The present invention is not limited to this. Examples 1 to 7 and Comparative Examples 1 to 4 Vinyl chloride resin compositions were prepared using the components (values in parts by weight) shown in Table 1 and their properties were evaluated. The target values in the evaluation are also described. The details of the components and the evaluation method are as follows. Component PVC (degree of polymerization 1300), trade name TH-130
0, DOP manufactured by Taiyo PVC Co., Ltd. Tribasic lead sulfate + lead stearate manufactured by Mitsubishi Chemical Corporation, trade name YD-
804, calcium carbonate manufactured by Shinagawa Kako Co., Ltd., trade name: Super 1500, zinc hydroxystannate manufactured by Maruo Calcium Co., Ltd., trade name: ALCANEX Z
HSC-100, manufactured by Mizusawa Chemical Industry Co., Ltd., zinc borate, trade name ALCANEX FRC-60
0, Antimony trioxide, manufactured by Mizusawa Chemical Industry Co., Ltd., trade name Polysafe 100ND-
T, evaluation method manufactured by Sanko Co., Ltd. Oxygen index: based on JIS K7201. Smoke density: based on ASTM E662 NBS method.

[0010]

[Table 1]

From Table 1, it can be seen that the examples containing zinc hydroxystannate and zinc borate in predetermined amounts in place of antimony trioxide have the same or higher flame retardancy and lower smoke density than the comparative examples.

[0012]

As described above, the flame-retardant vinyl chloride resin composition of the present invention is obtained by blending 1 to 20 parts by weight of zinc hydroxystannate and 5 to 30 parts by weight of zinc borate with 100 parts by weight of a vinyl chloride polymer. It is possible to secure flammability and to suppress the amount of smoke.

Claims (2)

[Claims] 1. 100 parts by weight of a vinyl chloride polymer,
1 to 20 parts by weight of zinc hydroxystannate and 5 to 5 parts of zinc borate
A flame-retardant, low-smoke, vinyl chloride resin composition comprising 30 parts by weight. 2. 100 parts by weight of a vinyl chloride polymer,
2. The flame-retardant low-smoke-generating vinyl chloride resin composition according to claim 1, comprising 30 to 60 parts by weight of a plasticizer, 2 to 10 parts by weight of a stabilizer, and 5 to 100 parts by weight of a filler.