Associative waterborne polyurethane/polyacrylate copolymer emulsion anti-settling thickener

Abstract

The invention relates to an associative waterborne polyurethane/polyacrylate copolymer emulsion anti-settling thickener. In the anti-settling thickener, polyacrylate accounts for 70 to 95 percent of the total amount of a resin; polyurethane accounts for 5 to 30 percent of the total amount of the resin; copolymer emulsion is 10 to 1,000nm in particle size, 10 to 60 percent in solid content, 10 to 60mPa.s in viscosity, 2 to 5 in pH value and 10,000 to 200,000 in molecular weight; a waterborne polyurethane chain segment contains a negative-ion hydrophilic group or has a better effect when containing negative-ion and nonionic hydrophilic groups at the same time. The novel associative waterborne polyurethane/polyacrylate copolymer emulsion anti-settling thickener is obtained through copolymerization of the polyurethane and the polyacrylate. By adopting the anti-settling thickener, the problem of precipitation due to adding of inorganic or organic filler in re-diluted waterborne industrial coatings or certain lower-viscosity waterborne systems can be solved effectively, and a long-term anti-settling effect is achieved.

Description

technical field [0001] The invention relates to a new type of associative water-based polyurethane / polyacrylate copolymer emulsion anti-settling thickener, which can be used for the dispersion and anti-settling of inorganic fillers in powder-free PVC glove coatings, as well as inorganic or organic fillers in all other low-viscosity water-based systems Dispersion and anti-settling. Background technique [0002] In some re-diluted water-based industrial coatings or some low-viscosity water-based systems, the precipitation of inorganic or organic fillers is always an urgent problem to be solved. Typically, precipitation during application is addressed by adding traditional associative acrylic thickeners or associative polyurethane thickeners to these systems. For example, the precipitation phenomenon caused by the addition of light calcium carbonate, silicon powder, aluminum silicate powder, titanium dioxide and other dense inorganic hard agents in powder-free PVC glove coatin...

AI Technical Summary

Problems solved by technology

Judging from the current situation, adding associative acrylic thickener or associative polyurethane thickener to these systems can solve the short-term (generally within 8 days) precipitation problem, but it cannot fundamentally solve the problems caused by long-term application. a large amount of precipitation

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