Preparation method of waterborne polyurethane for synthetic leather

Abstract

The invention provides a preparation method of waterborne polyurethane for synthetic leather. By using a micromolecular acrylic monomer for replacing acetone to be used as a diluting agent, a hydrophilic chain extender is dissolved in the earlier stage of synthesis, so that the viscosity of a reaction solution is lowered; the micromolecular acrylic monomer is used as a reaction monomer in the later stage for modifying polyurethane, so that no solvent residues exist after the reaction is ended. According to the method, a VOC (Volatile Organic Compound) in the waterborne polyurethane is greatly reduced, and the performance of the waterborne polyurethane is improved. The preparation method has the advantages of simple process, high equipment utilization rate, cleanness without pollution, convenience for industrial production. The waterborne polyurethane has the advantages of high solid content, good durability, low cost, no pollution in production and use processes, and wide application prospect in the synthetic leather industry.

Description

technical field [0001] The invention belongs to the technical field of chemical products and preparation methods, and relates to a preparation method of water-based polyurethane for synthetic leather. Background technique [0002] In recent years, my country's synthetic leather industry has developed rapidly and has gradually become a major exporter of synthetic leather products. According to statistics, my country exported 1.07 billion meters (599,600 tons) of artificial leather and synthetic leather microfiber leather in 2011, a year-on-year increase of 12.95%, and the export trade was 3.04 billion US dollars, a year-on-year increase of 35.11%; imports were 131 million meters (64,900 tons), a year-on-year decrease 14.9%, and the import value was 596 million US dollars, a year-on-year decrease of 4.6%. However, behind the prosperity of the synthetic leather industry, there are also great hidden dangers, that is, the pollution problem in the production process of synthetic l...

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the disadvantages of complex preparation process, solvent pollution, low product performance and high cost for the synthesis of water-based polyurethane, the present invention provides a method for preparing water-based polyurethane for synthetic leather. This method uses small-molecule acrylic monomers as Solvent and acrylic acid monomers are used as modifiers to modify water-based polyurethane at the same time. After the reaction, high-performance water-based polyurethane can be synthesized without distilling off the solvent

Images