Double-crosslinking-point monomer based carboxylic acid type ACM (acrylate rubber) and preparation method thereof

Abstract

The invention discloses double-crosslinking-point monomer based carboxylic acid type ACM (acrylate rubber) and a preparation method thereof. The carboxylic acid type ACM is prepared from the followingmonomers in percentage by mass through polymerization: 65%-85% of alkyl acrylate monomers, 10%-30% of oil-resistant and low-temperature-resistant monomers and 3%-8% of vulcanization point monomers, wherein the vulcanization point monomers comprise butene diacid diester monomers and olefinic bond type unsaturated monomers containing carboxyl groups, and a mass ratio of the butene diacid diester monomers to the olefinic bond type unsaturated monomers containing carboxyl groups is 1:2-2:3; ester groups in the olefinic bond type unsaturated monomers are ether alcohol with the carbon atom number being 6-10. According to the prepared rubber, on the basis of reservation of low permanent compression set value, oil resistance and heat resistance of carboxylic acid type acrylate rubber, processability is further improved, smoothness of the rubber surface is improved, and obtained acrylate vulcanized rubber composition can be used for preparing parts such as a hydraulic oil delivery pipe, a cylinder gasket, a sealing gasket and the like of an automobile and a locomotive.

Description

technical field [0001] The invention relates to the field of rubber, more specifically, the invention relates to a double crosslinking point monomer carboxylic acid type acrylate rubber and a preparation method thereof. Background technique [0002] Acrylate rubber (ACM) is an elastomer prepared by copolymerization of acrylate as the main monomer. It is widely used in various resistant materials because of its excellent properties such as heat resistance, aging resistance, oil resistance, ozone resistance, and ultraviolet In the environment of high temperature and oil resistance, especially in the field of automobiles (crankshaft, valve stem, cylinder head gasket, hydraulic oil pipeline, etc.), it has the reputation of "automotive glue". The comonomers of acrylate rubber can be divided into main monomers, low temperature oil resistant monomers and crosslinking point monomers. Commonly used main monomers include methyl acrylate, ethyl acrylate, butyl acrylate and 2-ethylhexy...

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Problems solved by technology

[0005] Patent CN03813660.0 discloses an acrylic rubber, a crosslinkable acrylic rubber composition, and a molded product, in order to provide an acrylic rubber that does not cause scorching at the initial stage of processing and can form an acrylic rubber with excellent heat resistance and compression set For cross-linked molded products, the solution is that the monomers at the cross-linking point contain butenedioic acid monoester compounds with alicyclic structures, and the monoesters are esters with ester ring structures such as cyclohexyl ester, cyclopentyl monoester, etc. Fat, but butenedioic acid mono-advanced monocyclic ester is difficult to synthesize, high toxicity, limited use, no improvement in vulcanization extrusion performance

[0006] Patent CN03811996.X discloses an acrylic rubber composition and a cross-linked product, which provides a cross-linked product that does not adhere to the metal surface during kneading, does not cause scorching during processing, and is excellent in heat resistance, cold resistance and inferior oil resistance acrylate rubber composition, the solution is to mix a specific crosslinking agent and a specific amine compound with carboxyl group-containing acrylic rubber derived from methacrylonitrile structural units, but methacrylonitrile will greatly affect low-temperature performance, and at the same time The crosslink density is also affected, and finally other properties cannot be taken into account

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