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Blended polymer material of polyalkyl methacrylate and silicone rubber as well as preparation method and application thereof

A technology of polyalkyl methacrylate and alkyl methacrylate, which is applied in the field of blended polymer materials of polyalkyl methacrylate and silicone rubber and its preparation, can solve the problem of poor operability, fracture elongation Long rate decline, incompatibility and other issues

Active Publication Date: 2020-12-22
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN109135630 A prepared a moisture-curable sealant by copolymerizing acrylate with functional acrylate and siloxane-containing (meth)acrylate, but the strength was low, only about 1.2MPa
X.W.He (Polymer, 1992, 33, 866) etc. used the method of continuous polymerization to blend the polysiloxane cross-linking system and the methyl methacrylate cross-linking system into the mold, and formed the PDMS network at room temperature first, and waited After gelation, the temperature was raised to start the copolymerization reaction of methacrylic acid monomers, and the fully interpenetrating and grafted interpenetrating networks were prepared respectively. The tensile strength of the material increased with the increase of PMMA components, but the elongation at break increased sharply. Decrease, can not achieve the improvement of comprehensive mechanical properties
Due to the incompatibility of polysiloxane and polymethacrylate, as well as the difference in polymerization mode and activity, when the polymerization network of one component is formed, the other component is often incompatible with it, and even macro-scale Phase separation, so a good interpenetrating polymer network is difficult to form, and even many defects will appear; moreover, the method of forming an interpenetrating polymer network structure is poor in process operability, which is not conducive to industrial production

Method used

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  • Blended polymer material of polyalkyl methacrylate and silicone rubber as well as preparation method and application thereof
  • Blended polymer material of polyalkyl methacrylate and silicone rubber as well as preparation method and application thereof
  • Blended polymer material of polyalkyl methacrylate and silicone rubber as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] 1.1

[0105] (1) Take 50g of vinyl-terminated polysiloxane (purchased from Dongguan Xibo Rubber Products Co., Ltd.), which includes a polymer with a structure shown in formula (III), wherein m is 200, n is 300, and q is 500, viscosity is 40000cp, containing 50wt% of MQ resin, dissolved in 30ml toluene, heated to 90°C in oil bath; 20g methyl methacrylate dissolved with 0.1g dibenzoyl peroxide was added dropwise , the dropping speed is 10 drops / min, mechanically stirred, the rotating speed is controlled at 120rpm, condensed and refluxed, after the dropwise addition is completed, the temperature is raised to 120°C for 10h, and the toluene solvent and residual methyl methacrylate are vacuumed to obtain polymethylmethacrylate Liquid blend of methyl acrylate and vinyl terminated polysiloxane.

[0106]

[0107] (2) The liquid blend of 62.5g of polymethyl methacrylate and vinyl-terminated polysiloxane prepared in step (1) is mixed with 5g of hydrogen-containing silicone oil...

Embodiment 2

[0114] (1) Take 50g of the same vinyl-terminated polysiloxane as in Example 1 (viscosity is 40000cp, containing 50wt% of MQ resin) and dissolve it in 30ml of o-xylene, heat the oil bath to 100°C; dissolve 20.0g of Add 0.2 g of ethyl methacrylate of di-tert-butyl peroxide drop by drop at a rate of 5 drops / min, mechanically stir at a speed of 300 rpm, condense and reflux, and heat up to 130°C for 20 hours after the addition is complete. The ortho-xylene solvent and residual ethyl methacrylate were vacuum removed to obtain a liquid blend of polyethyl methacrylate and vinyl-terminated polysiloxane.

[0115] (2) Mix 62.5g of the liquid blend of polyethyl methacrylate and vinyl-terminated polysiloxane prepared in step (1) with 5g of hydrogen-containing silicone oil (0.8% hydrogen content), 0.066g of divinyl Mix tetramethylsilane and 0.275g of platinum catalyst evenly. Take 12g of the mixture and pour it into the mold for defoaming treatment. Take 2g of the mixture to lap the steel s...

Embodiment 3

[0118] Step (1) Take 50g of hydroxyl-terminated polysiloxane, purchased from Jiangxi Xinghuo Organic Silicon Factory, which includes a polymer with a structure shown in formula (IV), n is 300, m is 400, q is 200, and the viscosity is 30000cp , dissolve it in 20ml of m-xylene, heat the oil bath to 100°C; add 18g of methyl methacrylate dissolved with 0.27g of di-tert-butyl peroxide dropwise at a rate of 5 drops / minute, Stir mechanically, control the rotation speed at 300rpm, condense and reflux, and after the dropwise addition, further raise the temperature to 130°C for 20h, and vacuum the m-xylene solvent and residual methyl methacrylate to obtain polymethyl methacrylate and terminal Liquid blend of hydroxypolysiloxanes.

[0119]

[0120] Step (2) Mix the liquid blend of 68g of polymethyl methacrylate and hydroxyl-terminated polysiloxane prepared in step (1) with 25g of tetraethoxysilane and 0.15g of butyltin, and pour 12g of the mixture into Defoaming treatment after the m...

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Abstract

The invention provides a blended polymer material of polyalkyl methacrylate and silicone rubber as well as a preparation method and application thereof. Under the compatibilization and dispersion effects of a compatibilizer, an in-situ polymerization method is adopted, polyalkyl methacrylate is used as a dispersion phase to be dispersed in a continuous phase of a polysiloxane network to form an island structure, and hundred-nanometer-scale polymethacrylate reinforced particles are generated in situ in an organosilicon polymer. The preparation of the polyalkyl methacrylate and silicone rubber blended polymer material with comprehensive excellent performance is realized, the bonding performance and hardness of the silicone rubber are remarkably improved, excellent mechanical strength and good breaking elongation are achieved, the damping temperature range is widened, and the preparation cost of the silicone rubber is greatly reduced. And the high-temperature storability and the high-temperature usability are relatively stable.

Description

technical field [0001] The invention belongs to the field of macromolecular materials, and in particular relates to a blended polymer material of polyalkylmethacrylate and silicone rubber and its preparation method and application. Background technique [0002] Polymer blending can not only improve the performance of the original single polymer, but also is an important technical way to reduce costs, showing its unique advantages. Polyalkylmethacrylate has high hardness, high strength, and low cost, but it is sticky at high temperature and poor in low temperature toughness, while silicone rubber has superior properties such as high elasticity, high and low temperature resistance, weather resistance, and hydrophobicity, but low strength. Poor adhesion, low hardness, and much higher cost than polyalkylmethacrylate. Therefore, the effective combination of silicone rubber and polyalkylmethacrylate may achieve complementary advantages, which has attracted great attention from re...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/04C08L33/12C08L33/10
CPCC08L83/04C08L33/12C08L33/10
Inventor 张志杰黄彬戴丽娜张学忠汪倩孔书轩
Owner INST OF CHEM CHINESE ACAD OF SCI
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