Polylactic acid scarf polyurethane environment-friendly waterproof coating and preparation process thereof

Abstract

The invention discloses a polylactic acid scarf polyurethane environment-friendly waterproof coating and a preparation process thereof. The waterproof coating comprises, by weight, 100 parts of polytetramethylene ether glycol, 25-45 parts of isophorone diisocyanate, 30-50 parts of hydroxyl-terminated polylactide, 7-15 parts of nano-scale oxidized graphene, 0.15-0.3 part of dibenzoyl peroxide, 4-8parts of tetrahydrofuran, 2-6 parts of chain extenders, 16-20 parts of acetone, 4-10 parts of triethylamine, 0.02-0.5 part of catalysts, 2-4 parts of defoaming agents, 1-3 leveling agents, 9-15 partsof deionized water and 40-60 parts of inorganic fillers. Graphene grafted polylactic acid copolymers are embedded into a polyurethane main chain, active groups such as ester bonds and carboxyl are introduced, the biological degradability and compatibility of the polyurethane coating are improved, and a degradation product is poisonless, harmless, green and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of polyurethane waterproof coatings, in particular to a polyurethane environment-friendly waterproof coating embedded with polylactic acid and a preparation process thereof. Background technique [0002] Polyurethane waterproof coating is an organic polymer material formed by the addition and polymerization of isocyanate and polyether. It has the advantages of high physical strength, high elongation, high flexibility, and good water resistance. It is widely used in construction projects, underground projects, Water resistance and anti-seepage of roofing engineering and other fields, but after the polyurethane coating is separated from the base surface, it will pollute the environment because it is difficult to degrade and recycle. Therefore, how to produce an environmentally friendly green polyurethane waterproof coating is currently in demand. solved problem. [0003] The patent application number is CN201...

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Problems solved by technology

[0002] Polyurethane waterproof coating is an organic polymer material formed by the addition and polymerization of isocyanate and polyether. It has the advantages of high physical strength, high elongation, high flexibility, and good water resistance. It is widely used in construction projects, underground projects, Water resistance and anti-seepage of roofing engineering and other fields, but after the polyurethane coating is separated from the base surface, it will pollute the environment because it is difficult to degrade and recycle. Therefore, how to produce an environmentally friendly green polyurethane waterproof coating is currently in demand. solved problem

[0003] The patent application number is CN201610327590.8, which discloses a preparation method and product of degradable water-based polyurethane coatings. The titanium dioxide / polylactic acid composite material is connected to the titanium dioxide / polylactic acid composite material through the -NCO of the isocyanate terminal group, so that the modified polyurethane coating is easily degraded by microorganisms, and at the same time improves The self-cleaning ability of the coating, but the titanium dioxide / polylactic acid composite material is polymerized through the lactide intermediate doped with nano-titanium dioxide. Polymerization reduces the degree of polymerization and physical strength of polylactic acid, which eventually leads to insufficient stability of the spatial structure and poor mechanical properties of polyurethane coatings.

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