JPS6035074A - Production of rubber packing material - Google Patents

Abstract

PURPOSE:To provide a rubber packing material which can be swollen by water and has an excellent water-stopping effect, by molding a mixture of a rubber component, a water-absorbing resin and an inflating agent and vulcanizing molding. CONSTITUTION:100pts.wt. unvulcanized rubber component (A) (e.g. natural rubber, a styrene/butadiene rubber or an ethylene/propylene rubber) contg. a crosslinking agent, 10-100pts.wt. water-absorbing resin (B) (e.g. a starch polymer or a polyvinyl alcohol polymer) non-compatible with the rubber component and 10- 200pts.wt. lime/gypsum inflating agent (C) (e.g. a lime inflating agent or a calcium sulfoaluminate inflating agent) non-compatible with the rubber component and the water-absorbing resin, are kneaded together. The resulting compsn. is molded into the desired shape by a press and vulcanized to obtain a rubber packing material (water stopping material).

Description

[Detailed Description of the Invention] Regarding the packing material, more specifically (A) bolimer,
The present invention relates to a method for producing a water-swellable backing material whose main components are (B) resin and <a> tensioning agent.

Conventionally, it is generally known that a resin is used alone as a cross-linked water-swellable rubber, but this has a large volume reduction when swollen upon water absorption and volume when dried after water absorption, resulting in a poor sealing effect. I can't perform to my full potential. Furthermore, it is not effective because the water-absorbing resin has a property of separating from the rubber phase and leaching into the water when swollen in water, resulting in a volume reduction.

The present invention was developed in order to eliminate the various disadvantages peculiar to water-absorbing resins, and its purpose is to improve the elasticity of rubber, water-swellability, and volume over time after swelling. The object of the present invention is to produce a novel backing material that has the ability to prevent shrinkage, that is, to minimize re-swelling.

The structure of the present invention and the implementation effects will be described in detail with examples.The composition of the water-swellable backing material of the present invention includes styrene-butadiene rubber, natural rubber, butadiene rubber,
Acrylonitrile butadiene rubber, butyl rubber, chloroprene rubber, acrylic rubber, ethylene propylene rubber,
Isoprene rubber, recycled tire rubber, and recycled butyl rubber are used. The polymer occupying in these compositions is 1sN
to weight.

Next, as the water-absorbing resin, starch-based polymer, -tcy
Used are a-x' yarn polymers, polyacrylic polymers, acrylate polymers, isobutylene polymers, polyvinyl alcohol polymers, and the like. The resin in the composition is S to go% by weight, and a lime-gypsum expanding agent such as Teha, a lime-based expanding agent, a calcium sulfoaluminate-based expanding agent, a lime-gypsum expanding agent, etc. is used. The lime-gypsum-based expanding agent in the composition is an expanding cement mixture, and for example, Expan manufactured by Onoda Cement Co., Ltd. is used to adjust the particle size. The swelling agent is 3-70
Appropriate weight %.

Fillers, reinforcing agents, coloring agents, vulcanization aids, activators, tackifiers, vulcanization accelerators, vulcanizing agents, lubricants, softeners, foaming agents, foaming aids, etc. are used to manufacture the backing material of the present invention. These ingredients are added in appropriate amounts as needed, but the proportions used vary depending on the purpose of use. As for the manufacturing process, after masticating the polymer,
The resin and swelling agent are added and mixed once or in several batches. As the cross-wire material, a normal cross-wire material such as a roll, a kneader, a banbury, etc. is used.

In addition, as the molding material, an extrusion molding machine, a press molding machine, a calendar molding machine, etc. are used, and as the vulcanizing material, a press vulcanizing machine, a -vulcanizing machine, a UHF vulcanizing machine, a glass bead continuous vulcanizing machine, A round press vulcanizer or the like is used to mold and vulcanize into a belt, rod, plate, disc, ring, sheet, etc. depending on the use.

The backing material manufactured in this way has good rubber elasticity and compression recovery properties, and is compatible with the mating material. It can be used in areas where conventional water-stopping materials have been used, such as joints, concrete joints, and manholes.

As described above, the water-swellable backing material according to the present invention comprises 10-100 parts by weight of a resin incompatible with the polymer, and 10-10 parts by weight of a swelling agent incompatible with the polymer and the resin. This is a new backing material consisting of 200 parts by weight, which is installed in the gap with a resin and an expansion agent, and the internal pressure is naturally raised by the expansion of the backing material immediately after release, resulting in excellent water-stopping and sealing functions. It can be used to improve long-term water-stopping effects.

Examples of the present invention will be described below.

Example/ 100 parts of natural goose, S part of zinc white, vulcanization accelerator 0M0.2
part, vulcanization accelerator MOII part, vulcanization accelerator 004 parts, stearic acid/part, sulfur 2 parts, Dexique V=SO part, resin 30 parts, expanding agent 170 parts, Pro-7 Soui/I/qo parts. A backing material was manufactured by kneading it in A/ and vulcanizing it in an Sl slab mold, but its expansion rate was 24.
After the hour, JAS, 78 after / 70 attack, /4'4 part 2s
.

-It was.

Furthermore, when we measured the expansion rate over a long period of time, it was 230% after 2 days.
%1. After 21 days, there was ivy at 220ft.

Example 70 parts of natural rubber, 10 parts of recycled tires, part S of zinc white, 2 parts of vulcanization accelerator DMO, 2 parts of vulcanization accelerator Mo, vulcanization accelerator D
As a result of experimenting in the same manner as in Example/, the expansion rate was 2 parts after hours. So 12
It was 310S after -17 days and 220-1lt days.

Further, the decrease in tensile rate on long-term days was 2JrO% after 27 days and 22S- after 5 days.

Comparative Example / 70 parts of natural rubber, 30 parts of recycled tire, S part of zinc white, 2 parts of vulcanization accelerator DMO, 11 parts of vulcanization accelerator MO, 1 part of vulcanization accelerator DO, 1 part of stearic acid, 1 part of sulfur 20 parts of Dixie clay, 30 parts of white carbon, 40 parts of resin, and 1 part of process oil.
230% after 0 fA/U days. Also, the decrease in expansion rate on long-term days is 14to after 27 days/70-12g days.
Chidemetsu9.

As described above, it was found that the return of swelling was significantly large. In this way, when the backing material according to the present invention is used, the internal pressure is naturally reduced by the expansion of the backing material immediately after it is installed in the gap due to the resin and the expansion material. It has a water-stopping function and a sealing function, and can increase the long-term water-stopping effect.

Applicant: Futaba Rubber Industries Co., Ltd.

Claims (1)

[Scope of Claims] Flexible natural rubber, styrene-butachene rubber, phtadiene rubber, acrylonitrile-butadiene rubber, Neoglene rubber, isobutylene rubber, isoprene rubber, ethylene-propylene rubber, and recycled comb alone or blends of each polymer. Add 10 to 100 parts by weight of a water-absorbing resin that is incompatible with the polymer to 100 parts by weight of the product,
Furthermore, 10 to 200 parts by weight of a lime-gypsum-based swelling agent (hereinafter referred to as swelling agent) which is incompatible with the polymer and the resin is mixed and kneaded with 10 parts by weight of the polymer, and the water-swelling curvature is produced. Dominant backing ρ manufacturing method.