Two-component PU (polyurethane) coating and preparation method thereof
A two-component polyurethane and coating technology, applied in the field of coatings, can solve the problems of film-forming mechanical properties, poor water resistance and solvent resistance, and achieve the effect of increasing the degree of crosslinking and reducing water absorption
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[0030] Example 1:
[0031] A two-component polyurethane coating, characterized in that the coating is composed of component A and component B with a mass ratio of 2:1, and said component A is composed of the following raw materials by weight:
[0032] Ethyl cellulose 3, isophorone diisocyanate 67, polycarbonate diol 100, polysilsesquioxane 1.6, 1,4-butanediol 1.3, azobisisobutyronitrile 0.9, stannous octoate 0.17 , Fluoroboric acid 0.13, Castor oil 16;
[0033] The B component is composed of the following parts by weight of raw materials:
[0034] 3,3'-dichloro-4,4'-diaminodiphenylmethane 3, polypropylene glycol 3, chlorinated paraffin 5, light calcium carbonate 4.
[0035] A method for preparing a two-component polyurethane coating includes the following steps:
[0036] The preparation method of component A includes the following steps:
[0037] (1) Heat the polycarbonate diol to 120°C and remove water under reduced pressure for 2h;
[0038] (2) Add castor oil to 10 times the weight of i...
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