Preparation process of low modulus waterproof silicone sealing material

Abstract

The invention discloses a preparation process of a low-modulus waterproof organic silicon sealing material, which comprises the following steps: (1) dispersing 5-10 parts of organic silicon oligomers into 25-35 parts of organic silane coupling agent, stirring evenly to obtain Mixed solution; (2) Add 30-40 parts of filler, 3-5 parts of chain extender and 3-5 parts of crosslinking agent to the mixed solution, and mix uniformly for 10-20 minutes under vacuum; (3) Obtained in step 2 Add 1-3 parts of catalyst to the mixed solution, and mix uniformly again for 10-20 minutes; (4) Vacuum the mixed solution to remove air bubbles, and at the same time remove part of the low-molecular substances generated in the reaction to obtain low-modulus waterproof silicone Sealing material. The organosilicon sealing material of the present invention has excellent high and low temperature resistance, good water resistance, excellent stretch recovery, low modulus, and high elongation at break, and can be used for waterproofing of hydraulic concrete, anticorrosion of marine concrete, and road concrete Among materials such as protective materials, it has the advantages of non-toxic, harmless and non-polluting to the environment.

Description

technical field [0001] The invention relates to a preparation method of a polymer material, in particular to a preparation process of a low-modulus waterproof organic silicon sealing material. Background technique [0002] With the rapid development of construction and transportation in my country, large-scale construction facilities, highways and tunnel projects are increasing day by day. The problem of concrete expansion joints has attracted great attention from the engineering community. It is required to further improve the aging resistance, water resistance and elasticity of concrete expansion joint materials. performance, overall adhesion and strength. At present, the concrete joint sealing materials used in China mainly include asphalt, modified asphalt, prefabricated neoprene rubber, polysulfide and polyurethane. These materials have poor aging resistance, short service life, low adhesion and strength to the substrate, insufficient displacement capacity, and are pron...

AI Technical Summary

Problems solved by technology

These materials have poor aging resistance, short service life, low adhesion and strength to the substrate, insufficient displacement capacity, and are prone to problems such as disengagement, fracture, extrusion damage, etc., and most of them are toxic and easy to cause environmental pollution.

Silicone materials are excellent in waterproofing, economical, convenient in construction, and do not change the appearance of concrete structures, so they have received extensive attention. However, many studies and patents simply focus on waterproofing, ignoring the multifunctional requirements of building materials such as environmental protection.