ure is reduced and the cold resistance is better. When the above-mentioned two monomers are used in

Acrylate: A general term for esters of acrylic acid and its homologues. The more important ones are methyl acrylate, ethyl acrylate, 2-methyl methacrylate and 2-ethyl methacrylate. It can be self-polymerized or copolymerized with other monomers, and it is a monomer for the manufacture of adhesives, synthetic resins, special rubbers and plastics.

The performance of acrylate rubber is affected by the number of alkyl carbon atoms in its main monomer, alkyl acrylate. Acrylate-based rubber has better oil resistance and heat resistance; while butyl acrylate-based rubber has an increased shielding effect on ester polar groups due to the increase in the number of alkyl carbon atoms, thus making it water resistant. At the same time, due to the shielding effect, the intermolecular force of the rubber is weakened and the internal plasticity is increased, so that the brittle temperature is reduced and the cold resistance is better. When the above-mentioned two monomers are used in combination, a rubber with properties between the two can be obtained.

No matter which type of acrylate rubber, there are two common features of its molecular structure: one is high polarity; the other is complete saturation. So that it has excellent resistance to mineral oil and high temperature oxidation properties. Its oil resistance is second only to that of fluorine rubber, and is similar to that of nitrile rubber with medium and high acrylonitrile content. The heat resistance is between general rubber and silicon and fluorine rubber. It is 30~60°C higher than nitrile rubber, and the maximum service temperature is 180°C. It can reach 200°C for intermittent and short-term use. There is no significant change in performance over several years of air aging. In addition, the most important thing is that it is very stable to extreme pressure lubricants containing extreme pressure agents such as sulfur, chlorine, phosphorus, etc. The operating temperature can reach 150 ° C, and the intermittent use temperature can be higher. The nitrile rubber with double bond will harden and become brittle when the temperature exceeds 110℃ in oil containing extreme pressure agent. Acrylate rubber also has excellent ozone resistance, air tightness, flex resistance and crack growth resistance, and resistance to ultraviolet discoloration.

The processing performance is poor, the rubber material is easy to stick to the roller, the flow rate is slow, the cold resistance is poor, it is not resistant to water, water vapor, acid and alkali, salt solution and organic polar solvents, the elasticity at room temperature is poor, the wear resistance is poor, and the electrical properties are poor.

Since acrylate rubber is second only to fluororubber in terms of heat resistance and oil resistance, it is the material used in the manufacture of rubber oil seals, O-rings, gaskets and hoses used at high temperatures of 180°C. Because of its stability to high temperature and extreme pressure lubricating oil, it has an absolute advantage in all kinds of automotive sealing parts in the world. In addition, the excellent properties of acrylate rubber can be used to manufacture tapes, container linings, rubber products for deep well exploration, sponge oil-resistant gaskets, and oil-resistant asbestos-rubber products. Acrylic rubber is also used in advanced science and technology sectors such as aviation, rockets, and missiles. Such as adhesives for the preparation of solid fuels, etc.

Since the solubility parameter of polyacrylate is not much different from that of uncured epoxy resin, the two have good mutual solubility. And because the main chain of polyacrylate does not contain double bonds, it has good thermal oxidation resistance.

      The determinants of acrylate liquid rubber toughening epoxy are: whether the rubber phase is formed, the composition and elasticity of the rubber phase, the size distribution of the rubber phase particles, the chemical bonding between the rubber phase and the epoxy resin matrix, and the molecular structure of the epoxy resin matrix. The concentration of epoxy functional groups in its molecule, etc. Among them, the main factors are the phase structure of the cured resin system, the chemical bonding between the rubber phase and the epoxy matrix, and the ductility of the epoxy resin system itself. The phase structure of the acrylate liquid rubber toughened epoxy system is mainly the rubber phase with The regular spherical particles are uniformly dispersed in the epoxy matrix, and the dispersed phase is composed of two spherical particles of different sizes.

A bipolar distribution of particle size is beneficial for toughening. Small particles mainly contribute to shear deformation, and large particles can prevent crack growth. In this way, it has obvious effect on the toughening and modification of epoxy resin.

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