Knife coating type polyurea waterproof coating
A technology of waterproof coating and polyurea, applied in the direction of polyurea/polyurethane coating, coating, etc., can solve the problem of low strength of scraping polyurea, and achieve the effect of excellent waterproof performance and excellent mechanical and mechanical properties of the coating
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[0022] Example 1:
[0023] 207g polyether glycol and 80g plasticizer were added to a 500mL four-necked reaction flask, heated to 100℃~120℃, vacuum dehydrated for 4h, cooled below 50℃, added 224g diisocyanate, heated slowly, controlled temperature 80 ~85℃, react for 2.5h under vacuum condition, cool down by 50~60℃, add defoamer, stir for 30min, discharge and seal to obtain component A.
[0024] 290g polyether triol was added to a 500mL four-necked reaction flask, heated to 80℃, added 4.5g of titanium dioxide, added 90g of chain extender, stirred well, heated to 100℃~120℃, vacuum dehydrated for 4h, cooled by 50 ~60℃, add 1.5g dibutyltin dilaurate, 0.3g defoamer, 2.3g ultraviolet absorber, 0.2g dispersant, 0.2g anti-separation auxiliary agent and stir for 10min, then add 13.5g molecular sieve water absorbent, stir 20min, add the color paste, mix evenly and then discharge, then B component is obtained. The A and B components are mixed to obtain the waterproof coating of the present i...
Example Embodiment
[0025] Example 2:
[0026] The A component is in accordance with Example 1. The amount of chain extender in component B is 110g.
Example Embodiment
[0027] Example 3:
[0028] The A component is in accordance with Example 1. The amount of chain extender in component B is 130 g.
[0029] Performance Testing:
[0030] The scratch-coated polyurea prepared above was tested for some physical and mechanical properties under specified conditions according to the test method for building waterproof materials GB / T 16777-1997. Table 1 lists some basic performance test results of the knife-coated polyurea.
[0031] Table 1 Performance test results of scratch-coated polyurea waterproof coating
[0032] Performance
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