Self-healing organofluorosilicon modified polyurethane waterproof coating and preparation method thereof

Abstract

The invention discloses a self-repairing organic fluorine silicon modified polyurethane waterproof coating and a preparation method thereof, comprising the following raw materials in parts by mass: 60-80 parts of polytetramethylene ether glycol, 15-30 parts of perfluoropolyether glycol, iso 40-60 parts of phorone diisocyanate, 20-35 parts of 4,4'-dithiodiphenylamine, 20-30 parts of fluorine-containing hydroxyl silicone oil, 30-40 parts of tetrahydrofuran, 0.8-2 parts of dibutyltin dilaurate, 2-3 parts of Tween 80, 15-20 parts of nano-calcium carbonate, 5-10 parts of nano-hydroxycalcium phosphate, 10-20 parts of deionized water; the preparation method is as follows: S1: prepare polyurethane prepolymer; S2: mix 4 , 4'-dithiodiphenylamine and fluorine-containing hydroxyl silicone oil were dissolved in tetrahydrofuran, then polyurethane prepolymer was added, and stirred and reacted at 60°C for 3-6 hours under a nitrogen atmosphere; S3: Preparation of organic fluorine-silicon modified polyurethane waterproof coating . The present invention combines disulfide bond, shape memory effect, and organic fluorine silicon modification, and by introducing S-S, C-F, Si-O bonds into the polyurethane molecular chain, it significantly improves its hydrophobicity, oil repellency, high and low temperature resistance, Weather resistance, corrosion resistance and other properties.

Description

technical field [0001] The invention belongs to the technical field of waterproof materials, and in particular relates to a self-repairing organic fluorine silicon modified polyurethane waterproof coating and a preparation method thereof. Background technique [0002] Self-healing polyurethane material is a biomimetic intelligent material with high elasticity and self-healing ability. It mainly achieves the purpose of self-healing by introducing reversible covalent bonds, such as reversible disulfide bonds, reversible acylhydrazone bonds and Diels-Alder reactions. , Under the stimulation of external conditions such as light and heat, the cracks produced by polyurethane are repaired through the recombination of covalent bonds to avoid crack expansion. [0003] Organofluorosilicon material is a new type of material produced by molecular structure design and organic synthesis of organic fluorine and organic silicon materials. It has the advantages of both organic fluorine and o...

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Problems solved by technology

[0004] In the prior art, although various synthesis methods of self-healing polyurethane materials or methods for modifying polyurethane with organofluorosilicon have been disclosed, there is no further modification of disulfide bond-containing polyurethane with organofluorosilicon to make it both repeatable self-healing and Disclosure of related documents or patents on the function of shape memory effect, such as the patent application number CN201910799259.X, which discloses a double self-healing polyurethane coating containing disulfide bonds and hydrogen bonds for invisible car coverings and its preparation method. One or both of polybutadiene and hydroxyl-terminated polysiloxane are copolymerized with diisocyanate and disulfide bond-containing chain extender A to form self-healing polyurethane, but no further modification with organofluorosilicon

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