Polyurethane sealant and preparation method thereof
A polyurethane sealant and prepolymer technology, applied in the field of sealants, can solve the problems of chemical reaction bubbles, affecting the application effect and working efficiency of the one-component polyurethane sealant, affecting the bonding strength, etc., and achieving a reduction in the probability of bubbles. Effect
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[0017] In order to further illustrate the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation of the polyurethane sealant proposed according to the present invention is described in detail below in conjunction with the preferred embodiments.
[0018] (1) Synthesis of prepolymer
[0019] Prepolymer Synthesis Example 1-4, by weight percentage, its specific composition is shown in Table 1:
[0020] Table 1
[0021] Prepolymer Polyether diol(%) Polyether triol(%) Butanediol(%) Diphenylmethane diisocyanate (%) Dibutyltin dilaurate (%) Oxazolidine latent curing agent (%) Acid catalyst (%) Defoamer (%) Example 1 30 52 1.9 14 0.1 1.8 0.1 0.1 Example 2 35 45 2.3 15 0.2 2 0.3 0.2 Example 3 40 40 2.4 15.5 0.3 1.3 0.2 0.3 Example 4 45 34 2.5 16.2 0.5 1.1 0.3 0.4
[0022] The preparation method of above prepolymer embodiment has th...
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