Hardly-foamed one-component polyurethane sealant
A technology of polyurethane sealant and polyurethane prepolymer, applied in the field of sealant, can solve problems such as easy foaming, and achieve the effects of good elasticity, excellent bonding performance and high strength
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[0027] In the following, the present invention will now be described more fully, showing various embodiments. However, the present invention can be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.
[0028] A mixture of polyether polyols (PPG polyether with molecular weight of 2000, functionality of 2, and E0-terminated propylene oxide polyether with molecular weight of 6000, functionality of 3, mass ratio 1:2) and plasticizer Put it into the reaction kettle, under the conditions of 110~130℃, vacuum degree -0.098 MPa, dehydration until the water content is less than 500ppm, then cool to about 50℃, add polyisocyanate MDI, nitrogen protection, stir, control the reaction temperature 75~ The reaction was carried out at 90°C for 1....
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