Environment-friendly organosilicone-modified polyether sealant and preparation method thereof

Abstract

The invention relates to a sealant and particularly relates to an environment-friendly organosilicone-modified polyether sealant and a preparation method thereof. The sealant is prepared from the following raw materials: difunctional polyether polyol, allyl polyether, polyisocyanate, a catalyst and organosiloxane. The preparation method of the sealant comprises the following steps: (1) firstly adding the difunctional polyether polyol and the polyisocyanate into a reactor, increasing the temperature to 80-90 DEG C, reacting and enabling mass fraction of NCO to reach 0.8-1.05%; (2) adding the allyl polyether, keeping the temperature and reacting and enabling the mass fraction of NCO to be 0; and (3) adding part of the catalyst and part of the organosiloxane, keeping the temperature and reacting to obtain an organosilicone-modified polyether sealant prepolymer, and then adding the rest of the catalyst to prepare the environment-friendly organosilicone-modified polyether sealant. The preparation method is simple and is easy to operate; the prepared sealant is high in bonding strength, excellent in sealing effect, excellent in ageing resistance, adjustable in curing speed and free of VOC (volatile organic compound), and is environmentally friendly and odorless.

Description

technical field

[0001] The invention relates to a sealant, in particular to an environment-friendly silicone modified polyether sealant and a preparation method thereof. Background technique

[0002] With the improvement of people's safety requirements and life taste, whether it is green or not has attracted more and more attention. However, traditional elastic sealants, such as polysulfide rubber, polyurethane sealant and organic silicone rubber, have their own defects. Polysulfide rubber has poor durability and resistance to deformation and displacement; polyurethane glue will have NCO residues during construction, which will cause environmental pollution. Pollution; silicone rubber has disadvantages such as poor mechanical properties and surface finish. Therefore, there is an urgent need to provide a sealant that satisfies the requirements of bonding strength and sealing performance, is environmentally friendly, does not contain VOC, is odorless, and has excellent workab...

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