JPS62205177A - Nbr based vulcanizable adhesive and bonding using said adhesive - Google Patents

Abstract

PURPOSE:An NBR based vulcanizable adhesive, obtained by dissolving an NBR compound with a high nitrile content in a ketone, aromatic hydrocarbon or a solvent consisting of a mixture thereof and useful for bonding metal to NBR with a low - medium nitrile content. CONSTITUTION:An adhesive obtained by dissolving an NBR compound with a high nitrile content prepared by blending a vulcanizing agent or other ingredients in a ketone, aromatic hydrocarbon or solvent consisting of a mixture thereof, e.g. a mixed solvent of methyl ethyl ketone and toluene at >=1 weight ratio based on the methyl ethyl ketone. In bonding, a phenolic resin solution is preferably primed as a primer and the above-mentioned adhesive is used to bond the metal to the NBR.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an NBR-based vulcanized adhesive and an adhesion method using the same. More specifically, the present invention relates to an NBR-based vulcanized adhesive for adhering metal and low to medium nitrile content NBR, and an adhesion method using the same.

[Prior Art] and [Problems to be Solved by the Invention] Conventionally, phenolic resins have been generally used as adhesives between metals and NBR, but low to medium nitrile content NBR ( Acrylonitrile content 19-3
2%), almost no adhesion was observed.

In view of the current situation, the present inventor sought a vulcanized adhesive that exhibits good adhesion even to NBR with a low to medium nitrile content. ) was found to be suitable for use, and that it was preferable to use a phenolic resin solution as a metal primer for adhesion.

[Means for Solving the Problems] and [Operation] Accordingly, the present invention relates to an NBR-based vulcanizable adhesive for bonding metals with low to medium nitrile content NBR, and this NBR-based vulcanizable adhesive High nitrile content N containing sulfur agents and other additives
The BR formulation is dissolved in a solvent consisting of a ketone, an aromatic hydrocarbon, or a mixture thereof.

The present invention also relates to an adhesion method using such an NBR-based vulcanizable adhesive, in which the adhesion is performed by undercoating a metal with a phenolic resin solution as a primer, and then applying a high nitrile content NBR compound containing a vulcanizing agent and other compounding agents. This is done by adhering low to medium nitrile content NBR to metal using an NBR-based vulcanizing adhesive in which the material is dissolved in a solvent consisting of ketones, aromatic hydrocarbons or mixtures thereof.

The high nitrile content NBR compound, which is the adhesive component of the NBR-based vulcanizable adhesive, contains various compounding agents that are generally added to NBR, including a vulcanizing agent, such as carbon black,
Fillers such as white carbon, zinc white, plasticizers, anti-aging agents, vulcanization accelerators, etc. are blended as necessary, and ketones, aromatic hydrocarbons, or mixtures thereof are used to dissolve such blends. It is used as a solution dissolved in a solvent such that the solid content concentration is about 5 to 15%.

Methyl ethyl ketone and the like are used as the ketone, and toluene, benzene and the like are used as the aromatic hydrocarbon, but preferably a mixed solvent of methyl ethyl ketone and toluene in a weight ratio of 1 or more is used. If methyl ethyl ketone is used in a larger proportion than this, the prepared vulcanized adhesive solution tends to gel, and since methyl ethyl ketone has a relatively low boiling point, it tends to generate bubbles. On the other hand, if toluene alone is used, the high nitrile content NBR formulation may not be completely dissolved. From this point of view, methyl ethyl ketone is about 5 to 50% by weight, preferably about 10% by weight.
% by weight, and toluene is about 95-50% by weight;
Preferably, it is used in a proportion of about 90% by weight.

When adhering using the vulcanized adhesive solution prepared in this way, the metal is first coated with a phenolic resin solution as a primer.

As the metal, mild steel, stainless steel, aluminum, aluminum die-cast, brass, zinc, etc. are used, and a phenolic resin conventionally used for bonding with NBR is applied thereto as a primer solution.

After application of the primer, and after solvent drying for about 5 to 30 minutes at room temperature to about 180°C, a low to medium nitrile content NBR, also commonly used in the form of a formulation, is prepared using a vulcanization mold.
Metal and low to medium nitrile content N
Perform vulcanization adhesion with BR.

〔Effect of the invention〕

The NBR-based vulcanized adhesive according to the present invention is produced by applying a phenolic resin solution as a primer to metal.

As a formulation of high nitrile content NBH with good adhesion to this phenolic resin, its use in solution form ensures good adhesion with low to medium nitrile content NBR.

Furthermore, such as chlorinated rubber adhesives that have conventionally been used as adhesives with low to medium nitrile content NBR.

Problems such as metal corrosion and decreased water-resistant adhesion that are typical of halogen-containing substances are not observed.

Therefore, the NBR-based vulcanized adhesive according to the present invention is suitable for manufacturing various industrial rubber parts such as oil seals, gaskets, packings, etc., especially those used even in low-temperature atmospheres. It can be effectively used as a vulcanized adhesive for bonding NBR with a low to medium nitrile content.

〔Example〕

Next, the present invention will be explained with reference to examples. In addition.

part is 1 part by weight.

Example High Nitori/4II type (Nippon Zeon product Hiker 1 child)
1ω part Tade carbon black
60 zinc white
10 stearic acid
1 plastic rabbit J (II) OP)
5 Vulcanization accelerator valve 1 (tetramethylthiuram disulfide (N-cyclohexyB)-2-benzothiazyl sulfenamide) 1.5 Anti-aging agent [poly(
2,2.4-1-rimethino I/-1,2-dihydroquinoline) 1 sulfur
10 parts of a high nitrile content NBR blend consisting of each compounding component of 0.5 or more and 90 parts of a mixed solvent of methyl ethyl ketone-toluene (10 parts: 90% by weight)
An NBR-based vulcanized adhesive was prepared.

A phenolic resin primer (Tybrie BN, manufactured by Anchor Chemical Co., Ltd.) was applied onto a mild steel plate that had been subjected to surface roughening treatment by degreasing with a solvent and roughening by shot blasting. On top of this primer layer. The above NBR-based vulcanized adhesive was applied and dried at 150°C for 10 minutes.

Next, a low nitrile content NBR blend [in the above-mentioned high nitrile content NBR blend]. A formulation using the Nippon Zeon product Niball DN401 containing 1 part of acrylonitrile as NBR and the same amount of poly(2,2.4-cyclohexyl-2-benzothiazylsulfenamide) as an anti-aging agent] or medium Nitrile-containing ffiNBR
Blend [In the high nitrile content NBR blend, N
Nippon Zeon's Nippon Zeon product Ni-Ball DN302 of Atariro, Ni(-Ril Contains 28 Ki) was used as a BR, and Poly(2) was used as an anti-aging agent.

JI
Vulcanization adhesion to the mild steel plate coated with the NBR-based vulcanization adhesive was performed according to the 90° peel adhesion test method in Section 8.3 of S K-6301.

180℃, 60kg/a7. The test was carried out for 4 minutes.

Comparative Example In the example, no NBR-based vulcanizable adhesive was applied.

The mild steel sheets and low or medium nitrile content obtained in the following Examples and Comparative Examples, respectively. For adhesives with tNBR, autograph was used. 90” direction, 200Ill
Peel tests were conducted at a speed of 1 minute. The results obtained are shown in the following table.

Claims (1)

[Claims] 1. High nitrile content N containing a vulcanizing agent and other compounding agents
An NBR-based vulcanizable adhesive for bonding metals with low to medium nitrile content NBR, in which a BR compound is dissolved in a solvent consisting of a ketone, an aromatic hydrocarbon or a mixture thereof. 2. The NBR-based vulcanized adhesive according to claim 1, wherein the solvent used is a mixed solvent of methyl ethyl ketone and toluene in a weight ratio of 1 or more. 3. After undercoating the metal with a phenolic resin solution as a primer, a high nitrile content NBR formulation containing a vulcanizing agent and other additives was dissolved in a solvent consisting of ketones, aromatic hydrocarbons, or mixtures thereof. An adhesion method characterized by adhering low to medium nitrile content NBR to metal using an NBR-based vulcanized adhesive. 4. The bonding method according to claim 3, wherein the solvent used is a mixed solvent of methyl ethyl ketone and toluene in a weight ratio of 1 or more.