Self-repaired polyurethane waterproofing paint as well as preparation method and application thereof
A polyurethane waterproof and self-repair technology, which is applied in the field of architectural waterproof coatings, can solve the problems of poor compatibility between microcapsules and polyurethane, affect the mechanical properties of waterproof coatings, repair irreversibility, etc., achieve good self-repair performance and improve anti-seepage Leakage performance, on-site construction easy effect
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Embodiment 1
[0039] Example 1: Preparation of self-healing polyurethane coating.
[0040] Add 10 g of isopropanol to a 100 ml container, turn on the stirring, heat the epoxy resin to a molten state, slowly drop 40 g into the container with a dropper, and disperse uniformly to obtain solution A.
[0041] Weigh 0.2 g of super absorbent fiber, add it to solution A, continue to stir at room temperature for 2 hours, and obtain coating solution B.
[0042] Weigh 20g of the A component and 58g of the B component of the two-component polyurethane, add them to a 150ml container, add 0.8g of the coating solution B, turn on the stirring, weigh 2.4g of dicumyl peroxide and diphenylmethyl peroxide 1.2 g of acyl acid and 0.8 g of zinc oxide were added slowly in sequence, and the mixture was evenly mixed after stirring for 30 minutes to obtain a self-healing polyurethane homogeneous liquid D.
[0043] Place the 2mm thick mold flat on the oil paper, pour the homogeneous liquid D evenly, level it, and cure for 24 ...
Embodiment 2
[0055] Example 2: Preparation of self-healing polyurethane coating.
[0056] Add 10 g of isopropanol to a 100 ml container, turn on the stirring, heat the epoxy resin to a molten state, slowly drop 40 g under the container with a dropper, and disperse uniformly to obtain solution A. Weigh and add 0.2 g of super absorbent fiber, and continue to stir at room temperature for 2 hours to obtain coating solution B.
[0057] Weigh 20g polyurethane of component A and 60g of component B, add them to a 150ml container, add 0.8g of coating solution B, turn on the stirring, weigh 2.4g of dicumyl peroxide and 0.8g of zinc oxide, and add them slowly. Stir for 30 minutes and mix uniformly to obtain a self-healing polyurethane homogeneous liquid D; place a 2mm thick mold on oil paper, pour the homogeneous liquid evenly, level, and cure for 24 hours to obtain a self-healing polyurethane coating.
[0058] .
[0059] Such as Figure 5 As shown, in the case of complete cut, self-repair for 48 hours, wh...
Embodiment 3
[0061] Example 3: Preparation of self-healing polyurethane coating.
[0062] Add 10 g of isopropanol to a 100 ml container, turn on the stirring, heat the epoxy resin to a molten state, slowly drop 40 g under the container with a dropper, and disperse uniformly to obtain solution A. Weigh 0.2 g of super absorbent fiber and continue to stir at room temperature for 2 hours to obtain coating solution B. Weigh 20g polyurethane of component A and 60g of component B into a 150ml container, add 0.8g of coating solution B, turn on the stirring, weigh 2.4g of dicumyl peroxide and 1.2g of dibenzoyl peroxide, Zinc oxide 0.8g is added slowly, and after stirring for 30 minutes, it is evenly mixed to obtain self-healing polyurethane homogeneous liquid D; put the 2mm thickness mold flat on oil paper, pour the homogeneous liquid evenly, level it, and solidify for 24h to obtain Repair polyurethane coatings.
[0063] .
[0064] The sample prepared in Example 3 has an elongation at break of 611%. A...
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