A transparent high-strength silane-modified polyether sealant

Abstract

The invention provides a transparent high-strength silane-modified polyether sealant. The preparation method is as follows: at room temperature, add (in parts by mass) 100 parts of silane-modified polyether, 5-20 parts of polyether-modified polyether alkoxy MQ resin, 0-15 parts of plasticizer and 0.3-1 part of water-removing agent, stirred for 2 hours under nitrogen atmosphere; then added 0.1-1 part of catalyst, and continued to stir for 10 minutes under nitrogen atmosphere, that is The finished product of silane-modified polyether sealant is obtained. The present invention adopts liquid polyether-modified methoxyl MQ resin as reinforcing filler, which can provide uniformity and compatibility of mixing with silane-modified polyether, and the prepared silane-modified polyether sealant has good transparency Controllability and stability of mechanical strength, can be applied to the sealing of building decoration materials, electronic appliances, medical equipment, etc.

Description

technical field [0001] The invention belongs to the technical field of sealants, and relates to a transparent high-strength silane-modified polyether sealant and a preparation method thereof. Background technique [0002] Silane-modified polyether sealant (MS sealant for short) is based on a silane-modified polyether (MS resin for short) whose main chain is a macromolecular polyether and whose end group contains a hydrolyzable siloxane group. A new type of sealant obtained by water vapor cross-linking and curing. MS sealant overcomes the traditional polyurethane sealant containing free isocyanate, which is easy to form bubbles during curing, and the existence of silicone sealant such as: low tear strength, poor redecoration, easy dialysis and migration of plasticizer in the adhesive layer, and easy pollution Adjacent parts and other problems, and has both the advantages of polyurethane sealant and silicone sealant, with good adhesion, excellent mechanical properties, recoat...

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Problems solved by technology

[0004] The invention patent with the publication number CN106634770A discloses a transparent one-component silane-modified sealant and its preparation method, using fumed silica as a reinforcing filler, and controlling the amount of fumed silica added to ensure that the sealant However, the strength of the obtained transparent sealant is not high. When the amount of white carbon black added is 13% (mass fraction), the tensile strength of the obtained MS sealant is 1.6MPa, and the light transmittance is 75%. Continue to add White carbon black, the light transmittance of the system will be greatly reduced;

[0005] The invention patent with the publication number CN104449623A discloses a MS nail-free glue and its preparation method. It uses white carbon black as a reinforcing filler and methyl MQ resin as a reinforcing compound filler. The obtained MS nail-free glue has better Mechanical properties, when adding 10 parts of methyl MQ resin and 3 parts of white carbon black, the tensile strength of MS nail-free adhesive can reach 3.3 MPa, but the compatibility between methyl MQ resin and silane-modified polyether is poor, difficult to keep filling

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