Elastic emulsion prepared from water-soluble polyurethane and acrylic acid by hybrid polymerization

Abstract

The invention discloses an elastic emulsion prepared from water-soluble polyurethane and acrylic acid by hybrid polymerization, mainly comprising alkyl monomers, an emulsifier, water-soluble polyurethane, a buffering agent, an initiating agent and water, wherein the alkyl monomers comprise styrene, acrylic ester and alkene functional monomers. The invention is characterized in that the acrylamideof alkene functional monomers, hydroxymethyl acrylamide, acrylic acid, acrylonitrile and an alkene organic silane coupling agent are utilized to form a composite cross linking agent, thus enhancing the elasticity and water resistance of a polymer film; and the water-soluble polyurethane and acrylic acid monomers are introduced into the emulsion to carry out hybrid polymerization, so that the water-soluble polyurethane molecules can be uniformly adsorbed onto the surfaces of particles in the acrylic acid emulsion, and the performance features of polyurethane such as tensile strength, elongation at break, contamination resistance and the like can be effectively developed. Especially, low temperature elasticity can be obviously improved.

Description

technical field [0001] It has been reported in the literature that since the 1990s, the foreign emulsion polymerization technology has adopted the polymerization technology of hybrid emulsions. The performance of these hybrid emulsions is much higher than the compounding and blending of two different types of resin emulsions, reaching Or close to the effect of chemical structure modification. [0002] The invention relates to an elastic emulsion obtained by hybrid polymerization of waterborne polyurethane and acrylic acid monomers, which is used for the preparation of elastic coatings for exterior walls. Background technique [0003] At present, the acrylic elastic emulsion used for exterior wall decoration in China generally has low elongation at break, especially the elongation at low temperature is difficult to meet the national standard, and the stain resistance is also poor, barely passing the national standard or lower than the national standard. The water-based polyu...

AI Technical Summary

Problems solved by technology

In this method, after the water-based polyurethane and acrylic emulsion particles are blended, the compatibility of the particles of the two components is poor, and the particles are in a microscopic separation state, which is prone to flocculation, agglomeration, etc., and the coating performance does not change much. , that is, the characteristics of polyurethane are not obvious

In addition, in the synthesis of water-based polyurethane, some acrylic monomers are introduced through intermolecular group polymerization and condensation reaction for modification. This product is mainly polyurethane, and the amount of acrylic monomer is limited, and its performance is also based on the performance characteristics of polyamic acid. Mainly, and the cost is high, the process is complicated, the production is difficult, and it is difficult to adapt to large-scale production and application