JPS61146860A - Joint sheet and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joint sheet used as a base material for gaskets that are used in a wide range of industrial fields such as the chemical industry, automobiles, ships, and various equipment. .

Asbestos joint sheets have been widely used as conventional joint sheets. This asbestos joint sheet is made by using asbestos as a base fiber, kneading it with rubber as a binder, rubber chemicals, and filler to prepare a composition for forming a joint sheet. It is produced by inserting the joint sheet between a pair of rolls consisting of a cooling roll and hot rolling, laminating the composition for forming a joint sheet on the hot roll side, and then peeling off the sheet-like material laminated on the hot roll. Ta.

Such asbestos joint sheets contain asbestos as the base material am at a ratio of 60 to 80% by weight, but in recent years, asbestos resources have been depleted and problems in obtaining it have arisen, and asbestos has increased in the human body. It has also been pointed out that there is a negative impact on
The use of asbestos is beginning to be reconsidered. For this reason, much research is being conducted into producing joint sheets using fiber base materials instead of asbestos. For example, as an alternative to asbestos, glass fiber, carbon l1l11.
Attempts have been made to manufacture joint sheets by using inorganic fibers such as ceramic fibers or organic fibers such as aromatic polyamide flllrM and polyethylene fibers.

However, when trying to manufacture joint sheets using inorganic fibers or organic fibers other than asbestos using the same method as asbestos joint sheets, there are technical problems that are not recognized in the case of asbestos joint sheets. A new phenomenon was discovered by the present inventor. That is, when a joint sheet forming composition containing inorganic fibers other than asbestos or organic 11M as base fibers is inserted between a pair of rolls consisting of a hot roll and a cooling roll and heated and rolled, a joint sheet is formed. It has been found that the forming composition adheres not only to the hot roll side but also to the cooling roll side, resulting in a significant decrease in workability and waste of the joint sheet forming composition.

The present inventor investigated the cause of adhesion of the joint sheet forming composition to the cooling roll, and found that when the composition is press-fitted into the gap between the heating roll and the cooling roll, the composition and the cooling roll do not adhere to each other. It was discovered that the main cause of the charging phenomenon was friction generated between the two.

The present invention is an attempt to solve such problems, and is to provide a material between the hot roll and the cooling roll by using a non-wag cloth other than asbestos or an organic fiber based material. When inserting the composition for forming a joint sheet to manufacture a joint sheet, no adhesion of the composition to the cooling roll was observed,
Therefore, it is an object of the present invention to provide a joint sheet whose base fiber is an inorganic fiber or an organic fiber other than asbestos, which can be manufactured by the same method as an asbestos joint sheet.

Achieve! In the present invention, the above-mentioned problems are solved by adding a surfactant to the composition for forming a joint sheet.

That is, the joint sheet according to the present invention is characterized in that it contains a base fiber made of inorganic fibers other than asbestos, organic fibers, or both, a rubber material, a rubber chemical, a filler, and a surfactant.

Further, the method for producing a joint sheet according to the present invention uses base fibers made of inorganic fibers other than asbestos, organic fibers, or both, rubber materials, and rubber chemicals.

A composition for forming a joint sheet containing a filler, a surfactant, and a solvent for rubber materials is inserted between a pair of rolls consisting of a hot roll and a cooling roll and heated and rolled. The method is characterized in that the sheet-like material is laminated on the hot roll side, and then the sheet-like material laminated on the hot roll is peeled off.

The joint sheet according to the present invention comprises base fibers made of inorganic fibers other than asbestos, organic fibers, or both, rubber materials, rubber chemicals, fillers, and surfactants. However, each component will be explained in detail below.

Examples of inorganic 11rH other than asbestos include glass ant, ceramic fiber, rock wool, mineral wool, fused silica fiber, chemically treated high silica am, fused silicate alumina aim, and alumina continuous m.
Miscellaneous, stabilized zirconia 1! $1. Boron nitride woven cloth, alkali titanate AAM, wollastonite, whiskers,
Known inorganic fibers such as boron fibers, carbon fibers, and metal fibers are widely used as substrates for forming joint sheets. In addition, as the inorganic l1tII according to the present invention, asbestos S
Small amounts of aW can be used.

Examples of organic fibers include aromatic polyamide fibers, polyamide fibers, polyolefin fibers, and polyester I! miscellaneous, polyacrylonitrile fiber, polyvinyl alcohol fiber, polyvinyl chloride woven fabric, polyurea ms, polyurethane 1m$1. Conventional organic 4M fibers such as polyfluorocarbon fibers, phenol fibers, and cellulose fibers are widely used as base materials for forming joint sheets.

Among these, aromatic polyamide fibers (trade name Kepler, DuPont WIJ) and fibrillated aromatic polyamide 111 (trade name Kepler Valve) are particularly preferred.

Such base material $111 is 100% in joint sheet.
Preferably, it is used in an amount of ~8011%.

The rubber material plays the role of binding the above-mentioned I11, and includes nitrile rubber (NBR), styrene-butadiene rubber (
SBR>, isoprene rubber (IR).

Roprene rubber (OR), butadiene rubber (BR),
Butyl goro (IIR), ethylene-propylene rubber (E
PM), fluororubber (FPM), silicone rubber (Si
), chlorosulfonated polyethylene (C8M), ethylene vinegar and rubber (EVA), chlorinated polyethylene (CPE)
, butyl chloride rubber (CIR), epichlorohydrin rubber (ECO).

Nitrile imprene rubber (NIR), natural rubber (NR)
Conventionally known rubbers such as rubbers for forming joint sheets are widely used.

This rubber material is preferably used in an amount of 10 to 40i1% by weight in the joysite sheet.

Rubber chemicals and fillers include (+　>sulfur.

Vulcanizing agents such as zinc oxide, magnesium oxide, peroxide, dinitrolibenzene, (ii) thiazole compounds, polyamine compounds, sulfenamide compounds, dithiocarbamate compounds, aldehyde amine compounds, guandine compounds, Vulcanization accelerators such as thiourea compounds and xanthate compounds, (iii) clay, talc, barium sulfate.

Fillers such as sodium bicarbonate, graphite, zinc sulfate, and tripolite are widely used. These rubber chemicals and fillers are conventionally known for forming joint sheets.

This rubber chemical and filler are added to the joint sheet.
Preferably, it is used in an amount of 0 to 80% by weight.

Cationic surfactants are used as surfactants.

Anionic Surfactant 1 Conventionally known surfactants such as amphoteric surfactants and nonionic surfactants can be used.

Examples of cationic surfactants include amine compounds, quaternary surfactants,
Conventionally known cationic surfactants such as ammonium salts and imidacillin compounds can be used. Among these, quaternary ammonium salts such as lauryltrimethylammonium chloride and distearyldimethylammonium chloride are particularly preferred. Cationic surfactants are preferably used because the inorganic SLL, organic fibers, or rubber materials that make up the joint sheet are negatively charged, and in addition, cationic surfactants strongly adsorb to the fibers. It is thought that this is because of this.

As the anionic surfactant, alkyl sulfate, alkylaryl sulfonic acid, alkyl phosphate, carboxylate, etc. are used, and as the amphoteric surfactant, betaine type surfactant, etc. are used. Examples of nonionic surfactants include ether type surfactants such as polyoxyethylene alkyl phenol ether and polyoxyethylene alkyl ether, sorbitol,
Surfactants such as polyhydric alcohols such as glycerin and polyethylene glycol, ester surfactants such as polyoxyethylene fatty acid esters, amide surfactants such as fatty acid jetanolamide, water-soluble polymer compounds, and silicon compounds are used. sell.

Such a surfactant is contained in the joint sheet at a concentration of 0.1
It is preferably used in an amount of ~10% by weight, preferably 0.5~5.0% by weight. The amount of this surfactant is 0.1
If the amount is less than 10% by weight, it is not preferable because it will not be possible to sufficiently prevent the joint sheet forming composition from adhering to the cooling roll during hot rolling. On the other hand, if the amount exceeds 10% by weight, the composition This is not preferable because the effect of preventing the composition from adhering to the cooling roll is not enhanced, and the physical properties of the joint sheet may be deteriorated.

Furthermore, by incorporating a surfactant such as lauryltrimethylammonium chloride into the joint sheet, the heat resistance of the resulting joint sheet is quite unexpectedly improved, and it remains flexible even after being kept at high temperatures. will not be damaged.

Next, a method for manufacturing a joint sheet according to the present invention will be explained.

A rubber material is dissolved in a solvent for rubber materials such as toluene or rubber solvent, a rubber chemical and a filler are mixed therein, and then a surfactant is mixed therein. A clay-like joint sheet-forming composition is prepared by blending inorganic fibers other than asbestos, organic 'IIAH, or base fibers consisting of both into the IR solution or dispersion and kneading them uniformly. do.

Next, this composition is inserted between a pair of rolls consisting of a hot roll and a cooling roll and heated and rolled. At this time, the temperature of the heating roll is 120-160℃, and the temperature of the cooling roll is 20-160℃.
Preferably the temperature is maintained at 50 DEG C. Equipment containing such a pair of rolls is known as a sheeter equipment.

When the composition for forming a joint sheet is inserted between a pair of rolls as described above, the composition is hot rolled and laminated into a sheet on the hot roll side.

When this sheet-like composition is peeled off from the hot roll, a joint sheet is obtained.

The rubber solvent is almost completely evaporated during the kneading process and hot rolling process of the joint sheet forming composition.

(7) l! The joint sheet according to the present invention contains a surfactant in addition to the usual joint sheet components, so it does not adhere to the cooling roll during molding and can be laminated well onto the hot roll. . Therefore, it is possible to obtain the effect of excellent workability and less waste.

Surprisingly, joint sheets containing surfactants such as lauryltrimethylammonium chloride are also found to have the effect of preventing thermal deterioration of the rubber material and extending the life of gaskets formed from joint sheets.

Furthermore, the flexibility of the resulting joint sheet is improved.

EXAMPLES The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples.

Item 1 - A composition for forming a joint sheet having the following composition was prepared.

Free III/i 47% by weight Glass fiber... 5% by weight (chipped strand) Wollastonite... 42% by weight fibrillated aromatic poly 10% by weight amide m-fiber NBR15 Rubber chemicals (vulcanizing agents) 2.0〃Filling material
25 Quaternary ammonium salt
1.0 Lauryltrimethylammonium chloride, trade name Cortazine 24P Kao soap, cationic surfactant toluene 2 0 per 1kO of the above mixture
．． 5 ft of the obtained composition was inserted between a hot roll heated to a temperature of 130°C and a cooling roll maintained at 30°C, and hot rolled. In this way, the composition was laminated in the form of a sheet on the hot roll side. This sheet-like material was peeled off from the hot roll using a doctor blade to obtain a joint sheet.

At this time, no adhesion of the joint sheet forming composition to the cooling roll was observed.

Furthermore, the obtained joint sheet was found to be superior in flexibility and to be less likely to deteriorate and to be more durable than joint sheets manufactured in the same manner except that no tertiary ammonium salt was added. Understood. The results are shown in the table.

[Example 1] A joint sheet was produced in the same manner as in Example 1, except that the following composition for forming a joint sheet was used.

Inorganic Il! 47% by weight (same as Example 1) Fibrillated aromatic 10 Polyamide fiber NBR15 Rubber chemicals (vulcanizing agents) 2. O〃Filling material
25 Ertel alkyl phosphate 1. O〃Product name Sunstat N006 Sanyo Chemical, anionic surfactant toluene: 0 per 1 kg of the above mixture
．． During hot rolling at a rate of 51, no adhesion of this composition to the cooling roll was observed.

1l-1 A joint sheet was produced in the same manner as in Example 1, except that the following joint sheet forming composition was used.

Inorganic fabric $1 471% by weight (same as Example 1) Fibrillated aromatic 10 Polyamide I
! ViNBR15,.

Rubber chemicals (vulcanizing chemicals) 2.0 Filling materials
25 Polyoxyethylene alkyl 1. O〃Ether Nonion F209 Nonionic surfactant toluene manufactured by NOF Co., Ltd. 2 0 per 1 kg of the above mixture
．． During hot rolling at a rate of 51, no adhesion of this composition to the cooling roll was observed.

Example 4 A joint sheet was produced in the same manner as in Example 1, except that the following joint sheet forming composition was used.

Inorganic fiber 47% by weight (Example 1
) Fibrillated aromatic 10 Polyamide fiber NBR15 Rubber chemicals (vulcanizing chemicals) 2. O〃Filling material
25 Amphoteric surfactant
1.0 (Vistal IS, Matsumoto oil 1ilF) Toluene: 0 per 1kg of the above mixture
．． During hot rolling at a rate of 5It, no adhesion of this composition to the cooling roll was observed.

! In Example 1, a joint sheet was produced in the same manner as in Example 1, except that the following composition for forming a joint sheet was used.

Inorganic 88Il 47% by weight (same as Example 1) Fibrillated aromatic 10 Polyamide m
Fiber NBR15 Rubber chemicals (vulcanizing chemicals) 2.0 Filler
25 Silicon condensation surfactant 1, O (Colcoat, Japan Colcoat Chemical) Toluene 2 0 per 1 kg of the above mixture
．． During hot rolling at a ratio of 5j2, no adhesion of this composition to the cooling roll was observed.

111-History In Example 1, a joint sheet was produced in the same manner as in Example 1, except that the following composition for forming a joint sheet was used.

Fibrillated aromatic group 20!1% by weight polyamide IN Organic II, If (polyethylene) 3 NBR
15〃 Rubber chemicals (vulcanizing agents) 2.On filler
58 Quaternary ammonium salt
2. O (Kotajin 24P1 Kao Soap) Toluene: O, l for 1 ka of the above mixture! During hot rolling at a rate of , no adhesion of this composition to the cooling roll was observed.

Friend 11-L A joint sheet was produced in the same manner as in Example 1, except that the composition for forming a joint sheet described below was used.

Fibrillated aromatic 20% by weight polyamide sui Organic II! (Polyethylene) 3 Chloroprene rubber (CR) 15- Rubber chemicals (vulcanizing chemicals)
2.0〃Filling material 5
8 Anionic surfactant 2. O〃Sunstat 230-P Phosphate ester, Sanyo Chemical toluene 2 0 per 1 kg of the above mixture
．． During hot rolling at a rate of 82, no adhesion of this composition to the cooling roll was observed.

Yu IL Engineering [In Example 1, a joint sheet was produced in the same manner as in Example 1, except that the following composition for forming a joint sheet was used.

Fibrillated aromatic 20% by weight polyamide Ill Organic fiber (polyethylene) 3 Natural rubber (N
R) 2. O〃Filling material
58 Nonionic surfactant 2.
0 (Sunstat AA, Sanyo Chemical) Toluene: At the time of hot rolling at a ratio of 0.8 It to 1 ka of the above mixture, no adhesion of this composition to the cooling roll was observed.

m 9 A joint sheet was produced in the same manner as in Example 1, except that the following composition for forming a joint sheet was used.

Fibrillated aromatic 20% by weight polyamide fiber organic fiber 1! (Polyethylene) 3 SBR15
〃 Rubber chemicals (vulcanizing agents') 2.0〃 Fillers
58 Amphoteric surfactant
2.0 Alkyl betaine type anone BF, NOF toluene: At a ratio of 0.82 to 1 kg of the above mixture, no adhesion of this composition to the cooling roll was observed during hot rolling.

A joint sheet was produced in the same manner as in Example 1, except that the following composition for forming a joint sheet was used.

Fibrillated aromatic 20% by weight polyamide fiber organic 1 m] Ni 3 〃N
BR15〃 Rubber chemicals (vulcanizing agents') 2.0〃Filler
58 Silicon condensation surfactant 2.0 (Full Coat, Nihon Full Coat Chemical) Toluene 2 At a ratio of 0.81 to 1 ka of the above mixture During hot rolling, no adhesion of this composition to the cooling roll was observed. Ta.

A joint sheet was produced in the same manner as in Example 1, except that the quaternary ammonium salt, which is a cationic surfactant, was not used.

During hot rolling, adhesion of the joint sheet forming composition to the cooling roll was observed.

t2 A joint sheet was produced in the same manner as in Example 6, except that the quaternary ammonium salt, which is a cationic surfactant, was not used.

During hot rolling, adhesion of the joint sheet forming composition to the cooling roll was observed.

Regarding the joint sheet obtained as above,
Density, tensile strength, compressibility, recovery rate, and flexibility (thickness magnification) after thermal deterioration test (5 hours at 150°C)
were measured and the results are shown in the table.

(Leaving space below) 11: Imm Flash 1fs 1kE- From this table, even if the joint sheet contains a surfactant, the physical properties such as tensile strength, compressibility, and recovery rate are not impaired; It can be seen that the joint sheet obtained by containing the activator has excellent heat resistance without losing flexibility after the heat aging test.

Claims (2)

[Claims] (1) A joint sheet comprising a base fiber made of inorganic fibers other than asbestos, organic fibers, or both, a rubber material, a rubber product, a filler, and a surfactant. (2) Heat a composition for forming a joint sheet containing a base fiber made of inorganic fibers other than asbestos, organic fibers, or both, a rubber material, a rubber chemical, a filler, a surfactant, and a solvent for rubber materials. The composition is inserted between a pair of rolls consisting of a roll and a cooling roll and heated and rolled, thereby laminating the composition in the form of a sheet on the side of the hot roll, and then the sheet-like material laminated on the hot roll is peeled off. A method for manufacturing a joint sheet.