JPS60177043A - Gasket composition for fireproof door - Google Patents

Abstract

PURPOSE:A gasket composition for fireproof doors, consisting essentially of an inorganic ingredient, powdery rubber and a polyvinyl chloride based resin, and easily extrudable, injectable and calender moldable, etc. CONSTITUTION:A gasket composition for fireproof doors obtainable easily by incorporating (A) 100pts.wt. polyvinyl chloride based resin, mainly straight polyvinyl chloride with (B) 30-500pts.wt. powdery rubber, preferably acrylonitrile- butadiene copolymer rubber or chloroprene rubber and (C) >=50pts.wt. inorganic ingredient, preferably antimony trioxide, aluminum hydroxide and calcium carbonate as main components and ethylene-vinyl acetate based resin and tricresyl phosphate, etc. as secondary components to produce a resin compound, and extrusion molding the resultant resin compound. The above-mentioned gasket provides easy fitting work of glass.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides inorganic compounding agents, powdered rubber, and polyester rubber. A composition containing rubber and polyvinyl chloride thread resin is molded and used as a fire door gasket.

Conventional gaskets for fire doors are: (1) The conventional method is to mix flame retardant into the gasket and use it for fire doors, but this method has poor workability when collecting lath. There are many problems such as the glass falling off before it dries, or the glass breaking due to the expansion and contraction cycle after drying.

(2) Another possibility is to mix a flame retardant into rubber such as chlorograne and mold it for use in fire doors, but this method requires relatively high raw material costs and is difficult to extrude and mold. Since it is necessary to take a series of steps at any time, the cost of childcare becomes high, so it is rarely put into practical use.

(37 Also, conventional o
So-called soft PVC gaskets made by distributing T-plastic agent and filler, and soft PVC gaskets containing flame retardants made by simply adding flame retardants to the gaskets are subject to the JIS A-1302 "Fire protection test for noncombustible structural parts of buildings". method” is not satisfied.

This is because the polyvinyl chloride resin softens under heat and flows, causing the glass to fall off and create gaps where fire can catch fire.

As a result of repeated studies, the present inventor found that a resin composition containing an inorganic compound, powdered rubber, and polyvinyl chloride resin as the main components can be easily molded and used for fire door gaskets. We have arrived at the present invention.

This composition does not require the cumbersome construction of ordinary rubber molds, and can therefore be formulated into an extruder fitted to the tip of a predetermined mold, such as a conventional soft PVC/4' round. A molded gasket can be easily obtained by simply passing it through. Moreover, this gasket can completely pass the above-mentioned JISA-1302 "Fire protection test method for noncombustible structural parts of buildings".

That is, the present invention uses 30 parts to 500 parts of powdered rubber and 50 parts of powdered rubber to 100 parts of polyvinyl chloride-based 4if resin.
This is a gasket composition for a fire door, characterized in that the main component is an inorganic compounding agent of not less than it part.

In the present invention, as the polyvinyl chloride-based resin, so-called straight PVC consisting of only vinyl chloride monomers in nL and ℃ is mainly used, but copolymerized PVC with vinyl acetate, α-olenoin or other comonomers is also used. , PVC made by grafting vinyl chloride onto other polymers,
Chlorinated PVC, which is made by chlorinating polyvinyl chloride, is also used.

Powdered rubbers include acrylonitrile-butanoene copolymer rubber, chloroglene rubber, styrene-butadiene copolymer rubber,
Powder partitions of unvulcanized rubber such as natural rubber or rubber after carotization are used. Acrylonitrile-butadiene co-polymerized rubber or '''' (J/130 mm or more is required. If the powder rubber is less than 30 mm, the thermal softening property of polyvinyl chloride Because of this, when a gasket molded from the composition is exposed to flames, it softens and the shape of the gasket changes (the glass slips off, or the flame spreads, etc.). -8-1302, the condition will not be satisfied.If the powder rubber is 30 parts by weight or more, the gasket will not lose its shape due to curing due to crosslinking reaction when exposed to flame, which is preferable. If the amount exceeds 1 part, the good formability characteristic of polyvinyl chloride resin during extrusion molding is lost, and gasket molding becomes impossible.

As the inorganic compounding agent, for example, calcium carbonate, clay, aluminum hydroxide, magnesium hydroxide, antimony dioxide, etc. are used.

The amount of inorganic compounding agent added is polyvinyl chloride resin 1003
! It is necessary to have at least 50M dobe for the quantity part.

If it is less than 5ONJt parts, there will be less chaff during combustion and the shape retention will be poor (up to about 5001i parts is preferable.
In addition to polyvinyl chloride resin, powdered rubber, and inorganic compounding agents, DO is used to bind polyvinyl chloride resin compounding agents.
0T plasticizers such as P and TCP, +1# agents, stabilizers, additives such as ethylene/vinyl acetate resins, anti-aging agents often used as compounding agents for rubber, extender oils, fillers, etc. are also added as appropriate. It's good. Of course, in addition to the usual brominated flame retardant, an inorganic flame release agent such as antimony trioxide can also be added.

The gasket composition for a fire door of the present invention is manufactured by a conventional method for manufacturing a polyvinyl chloride resin compact, except for using the above-mentioned various compounding agents, and is manufactured by a molding method such as extrusion molding, injection molding, glow molding, etc. It can be molded.

According to the present invention, when producing a gasket for a fire door from a composition containing 100 parts of polyvinyl chloride resin, 30 to 500 parts by weight of powdered rubber, and 50 mJt parts or more of an inorganic compounding agent, a known thermoplastic plastic molding method is used. It can be easily molded using this method, and can be used stably for a long period of time without compromising the physical properties of the materials used.

This gasket for fire doors can be filled with glass.
Conventional 1? The workability of glass fitting can be greatly improved.

Hereinafter, temperature will be explained based on Examples. The section is based on Zenmata-juro.

Example 1 Polyvinyl chloride 100 (parts) (Denkabinirna 88-110) Powdered NBR (acrylonitrile 100 butadiene co-Toso Rubber J DOP (so-octyl phthalate) 100 antimony trioxide 50 carbonated calcium 250 epoxidized soybean oil 3 stearic acid Barium/zinc stearionate = l/l mixture +) a 3 The above raw materials were mixed and kneaded at 160°C. Gaskets for fire doors were obtained by extrusion molding at 180 DEG C. using this extrusion molding machine. Tests of Examples 2 to 7 and Comparative Examples 1 to 3 were conducted in the same manner. The results are listed in Table 1. It can be seen that if the amount of powdered rubber is too small or less than 50 parts (Comparative Example 3), the fire protection performance deteriorates. On the other hand, Examples 1 to 7 of ``C'' are preferable because they are both satisfactory in terms of fireproofing performance and moldability.

Claims (1)

[Scope of Claims] 1. The main components are polyvinyl chloride thread resin 1uoJL electric part, powdered rubber 30 to 500 Arashidobe, and inorganic compounding agent 50 imaginary m parts or more -f' A gasket composition for fire doors. 2. When the powder bed rubber is "I Chrylonitrile Loosetadiene Compatible Rubber or Chlorogren Rubber, IN!fit+#Water Range, Section 1, Day 1, Section 4, No. 4. The gasket composition for a fire door according to item 4, which is an inorganic compound, trioxide, trioxide, aluminum hydroxide, or calcium carbonate. 4. Ethylene/I! as a subcomponent. 11: The gas composition for fire prevention according to item 1 of claim 1 containing vinyl fiber. 5. Tricrenol 7-osnoate as a subcomponent.
A gasket composition for fire doors as described in Paragraph 1 of Section 4 of Claim J.