Acrylate modified waterborne polyurethane emulsion and preparation method thereof

Abstract

The invention discloses acrylate modified waterborne polyurethane emulsion and a preparation method thereof. The acrylate modified waterborne polyurethane emulsion is prepared from the following components in parts by weight: 20-30 parts of polyhydric alcohols, 10-20 parts of diisocyanate, 2-6 parts of hydrophilic chain-extending agent, 2-5 parts of organic base, 5-15 parts of cross-linking agent, 10-25 parts of acrylate monomer, 100-200 parts of deionized water, 0.01-0.1 part of dibutyltin dilaurate, 0.2-1 part of initiator and 10-30 parts of acetone. Acrylate is used to modify waterborne polyurethane, and a polyurethane material excellent in overall performance is obtained; the acrylate is used to participate in reaction, double bonds are introduced to a polyurethane main chain, then acrylate monomer polymerization is triggered, and a complex net structure can be formed; compared with traditional waterborne polyurethane, water resistance, heat resistance and mechanical property are obviously improved.

Description

technical field [0001] The invention relates to the field of polymer chemical materials, in particular to an acrylate-modified water-based polyurethane emulsion and a preparation method thereof. Background technique [0002] Polyurethane is a multifunctional polymer material with various raw materials and adjustable molecular structure. It is widely used in many fields such as foam plastics, elastomers, adhesives, and coatings. At present, there are two types of polyurethane materials: solvent-based and water-soluble. Generally speaking, solvent-based polyurethane is formed by solution polymerization with acetone, methyl ethyl ketone, toluene, etc. as the main solvents. These solvents are toxic solvents, so solvent-based polyurethane pollutes the environment during production and use. The safety factor is low, and there is great harm to people's health. With the progress of society and the development of science and technology, people's awareness of environmental protect...

AI Technical Summary

Problems solved by technology

Water-based polyurethane not only has the basic characteristics of solvent-based polyurethane, such as cold resistance, good elasticity, high gloss, and adjustable temperature of soft and hard segments, but also has the advantages of non-combustibility, non-toxic, and pollution-free, but it also has low solid content and physical and mechanical problems. Poor performance, poor water resistance, poor heat resistance and other shortcomings, which largely affect the application of waterborne polyurethane

Chinese patent (CN101429417A) discloses a highly adhesive water-based polyurethane adhesive that adopts aliphatic isocyanate synthesis. Although the solid content has increased, it cannot avoid the characteristics of poor mechanical properties and lower water resistance of the film; Chinese patent (CN101993677) discloses a water-based polyurethane with butanediol as a chain extender, but its viscosity is low and needs to be adjusted by adding a thickener, and the operation is troublesome and complicated

The U.S. patent (US4870129) discloses a water-based polyurethane with a solid content of 40% to 50%. The hydrophilic reagent uses a sulfonic acid diamine type. A large amount of solvent needs to be added during the preparation process, which consumes a lot of energy during recovery and will cause environmental pollution

[0004] Acrylic resin has the advantages of high mechanical strength, aging resistance, anti-yellowing, water resistance, etc., but it also has disadvantages such as poor resistance to organic solvents, poor heat resistance, and poor wear resistance.

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