Solvent-free polylactic acid bio-based polyurethane synthetic leather, preparation method and application

Abstract

The invention relates to solvent-free polylactic acid bio-based polyurethane synthetic leather, a preparation method and application. The synthetic leather is composed of waterborne polyurethane surface layer slurry, solvent-free polyurethane bonding layer slurry and polylactic acid treated base cloth. The preparation method of the synthetic leather comprises the following steps of coating release paper with the waterborne polyurethane surface layer slurry, and performing drying to obtain a surface layer composite film; uniformly coating the obtained surface layer composite film with the solvent-free polyurethane bonding layer slurry, performing drying, and enabling a coating layer to keep certain adhesion; and attaching the polylactic acid treated base cloth to an obtained bonding layer, and stripping the release paper after drying and curing, so that the solvent-free polylactic acid bio-based polyurethane synthetic leather is obtained. The solvent-free polylactic acid bio-based polyurethane synthetic leather prepared by the invention has the advantages of alcohol resistance, hydrolysis resistance, higher peel strength, high normal-temperature deflection and good wear resistance, and has degradability.

Description

technical field [0001] The invention belongs to the technical field of polyurethane synthetic leather, and in particular relates to a solvent-free polylactic acid bio-based polyurethane synthetic leather, a preparation method and an application. Background technique [0002] The eco-environmental technology of polyurethane synthetic leather currently focuses on water-based and solvent-free technologies, but its raw materials are still mainly derived from petroleum-based materials. There are no reports on the application of mature technical systems for polyurethane synthetic leather materials made of polylactic acid. The main reason is that polyurethane synthetic leather, as a polymer material, has high requirements on function and performance, while bio-based materials have relatively poor stability and poor structure controllability compared with petroleum-based materials. The application of polyurethane synthetic leather There are several problems to be overcome urgently: ...

AI Technical Summary

Problems solved by technology

The main reason is that polyurethane synthetic leather, as a polymer material, has high requirements on function and performance, while bio-based materials have relatively poor stability and poor structure controllability compared with petroleum-based materials. The application of polyurethane synthetic leather There are several problems to be overcome urgently: first, general bio-based materials are poorly bonded to polyurethane materials, and it is difficult to improve the compatibility between the two; second, most bio-based resin materials are wear-resistant, scratch-resistant, and water-resistant The physical properties such as solution are poor, and the durability of synthetic leather materials based on bio-based polyurethane resin needs to be improved; third, the bio-based base fabric has poor toughness and low strength, which will seriously affect the mechanical properties of polyurethane synthetic leather and limit its application.

[0003] Therefore, due to the difficulty in combining bio-based materials with polyurethane, poor durability, and insufficient strength of bio-based fabrics, bio-based polyurethane synthetic leather materials are still in the exploratory stage, and the current solvent-free polyurethane synthetic leather products have defects that are difficult to biodegrade , the development of bio-based degradable polyurethane synthetic leather is of great significance

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