Method for preparing water-resistant and cold-resistant leather coating agent with high solid content with pre-emulsified core-shell emulsion polymerization method

Abstract

The invention relates to a method for preparing a water-resistant and cold-resistant leather coating agent with high solid content with a pre-emulsified core-shell emulsion polymerization method. A polyacrylic ester coating agent is thermoplastic, so that the defects of 'hot sticking and cold check' exist generally. The method comprises the following steps of: preparing a core layer monomer pre-emulsion by using 0.08-0.12 part of a mixed emulsifying agent and 13-16 parts of a mixed monomer; preparing a shell layer monomer pre-emulsion by using 0.1-0.4 part of a mixed emulsifying agent and 13-18 parts of a mixed monomer; and stirring 0.7-1.0 part of a mixed emulsifying agent, 0.1-0.4 part of sodium bicarbonate and a mixed monomer and 0.04-0.08 part of an initiator, blueing the emulsion, dropwise adding the core layer pre-emulsion and 0.05-0.08 part of an initiator aqueous solution respectively, dropwise adding a shell layer pre-emulsion and 0.08-0.12 part of an initiator aqueous solution simultaneously, reacting and filtering to obtain a product. Due to the adoption of the method, the defects of high-temperature sticking and low-temperature check existing in the conventional polyacrylic ester leather coating agent are overcome effectively, and the water resistance and the solvent resistance of a coating are enhanced simultaneously.

Description

technical field [0001] The invention relates to a preparation method of a leather finishing agent, in particular to a method for preparing a high-solid-content water-resistant and cold-resistant leather finishing agent by a pre-emulsified core-shell emulsion polymerization method. Background technique [0002] Polyacrylate is a kind of leather finishing agent widely used at present. It has the advantages of flexibility and elasticity in film formation, light resistance, aging resistance, excellent wet rub resistance, and low cost of the coating; however, the polyacrylate finishing agent with a linear structure belongs to Thermoplastic materials are more sensitive to temperature. As the temperature rises, the coating will gradually become soft and sticky. When the temperature drops to a certain level, the coating will become brittle, which seriously affects its performance under special climate conditions. application. At present, the common polyacrylate leather finishing a...

AI Technical Summary

Problems solved by technology

However, these two methods only modify the polyacrylate on the molecular structure. Although the defect of "hot sticky and cold brittle" of the coating has been improved, it is still insufficient.