Single-component room-temperature vulcanized silicone rubber capable of being coated and method for preparing single-component room-temperature vulcanized silicone rubber

Abstract

The invention discloses single-component room-temperature vulcanized silicone rubber capable of being coated and a method for preparing the single-component room-temperature vulcanized silicone rubber. The single-component room-temperature vulcanized silicone rubber comprises, by weight, 100 parts of alpha, omega-dihydroxy polysiloxane, 3-20 parts of cross-linking agents, 5-200 parts of fillers, 0.01-2 parts of catalysts, 0.1-10 parts of tackifiers, 0-30 parts of plasticizing agents and 0.5-3 parts of migrating organosilicon activators. The single-component room-temperature vulcanized siliconerubber and the method have the advantages that reaction can be carried out on groups at two ends of each migrating organosilicon activator, large quantities of hydrophilic function groups are carriedon side chains of the migrating organosilicon activators, the migrating organosilicon activators can migrate to the surface of silicone rubber, accordingly, the surface coating properties of the silicone rubber can be obviously enhanced by the small quantity of added migrating organosilicon activators, and the obtained single-component room-temperature vulcanized silicone rubber capable of beingcoated is convenient to produce and construct, excellent in adhesive performance and stable in storage performance and is environmentally friendly; waterborne coating, really stone paint and the likeon the single-component room-temperature vulcanized silicone rubber capable of being coated are excellent in coating property and adhesion.

Description

technical field [0001] The invention relates to the technical field of silicone rubber preparation, in particular to a single-component paintable room temperature vulcanized silicone rubber and a preparation method thereof. Background technique [0002] As we all know, silicone sealant has excellent UV resistance, aging resistance and high and low temperature resistance after vulcanization, and has good adhesion to substrates and convenient construction, so it has been widely used in construction, industry, automobiles and other fields . However, the helical structure of the main chain of the silicone rubber molecule reduces or cancels the polarity of the silicon-oxygen bond, and the non-polar methyl group is outside the helical structure. When the silicone rubber is cured, its surface energy is extremely low and the surface The tension is small, the coating does not infiltrate it, the coating will shrink on the surface of the silicone rubber, and the adhesion is low, and i...

AI Technical Summary

Problems solved by technology

However, the helical structure of the main chain of the silicone rubber molecule reduces or cancels the polarity of the silicon-oxygen bond, and the non-polar methyl group is outside the helical structure. When the silicone rubber is cured, its surface energy is extremely low and the surface The tension is small, the coating does not infiltrate it, the coating will shrink on the surface of the silicone rubber, and the adhesion is low, and it is easy to fall off

In some places where appearance decoration and external bonding are required, such as aerospace, high-speed railways, prefabricated buildings and other fields, the application of silicone adhesives is greatly restricted due to the non-paintable surface.

[0003] Patent CN1654584A discloses a surface modifiable silicone sealant and its preparation method, which uses a large amount of hydroxyl-terminated modified polyorganosiloxane containing unsaturated bonds, amides and carboxyl groups, and the dosage needs to reach 10 -50 parts, which is not conducive to cost reduction, and the synthesis route is long and the method is complicated

[0004] Patent CN1793272A discloses a preparation method of a one-component surface-modified silicone sealing material, which introduces 1-3 parts of silane coupling agents containing cyano groups and secondary amino groups to improve the resistance of oil-based paints to modified silicone sealing materials. Finishing, but it is still difficult to meet the finishing of water-based coatings on silicone sealing materials

[0005] Patent CN102597117A proposes to use silane-terminated polyurethane and polysiloxane to synthesize a paintable elastomer, which has high cost, and the amount of silane-terminated polyurethane in the system is large, which is prone to system compatibility problems and is not conducive to weather resistance

[0006] Patent CN105368378A proposes a preparation method of paintable silicone glue, which improves the surface hydrophilicity by grafting modified silicone oil, but the addition amount is large, the cost is high, and the compatibility between hydrophilic silicone oil and silicone structure is prone to problems

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