A kind of preparation method and application of organosilicon-modified self-dulling waterborne polyurethane for synthetic leather

Abstract

The invention discloses a preparation method and application of organic silicon modified self-extinction waterborne polyurethane for synthetic leather. The preparation method comprises the following steps: reacting 200-300 parts (in parts by weight) of amino silicon oil, 40-60 parts of mixed polymer diol, 40-50 parts of mixed diisocyanate and 2-3 parts of triethylamine at a temperature of 75-85 DEG C, and then, adding 7-8 parts of dimethylolpropionic acid, 2-5 parts of 1,4-butanediol and 2-3 parts of triethylamine at a temperature of 75-85 DEG C to react, and then, adding 6-10 parts of mixed diamine and 300-400 parts of water, and adding 8-10 parts of HDI tripolymer after emulsifying, and stirring to obtain the organic silicon modified self-extinction waterborne polyurethane. The preparation method can adopt a step-by-step polymerization method to synthesize organic silicon modified self-extinction waterborne polyurethane emulsion which takes organic silicon as a shell and takes inner-crosslinking waterborne polyurethane as a core, and has a core-shell microsphere structure, is applied to surface treatment of synthetic leather, can form a surface which is uneven microscopically, generates a deep extinction effect, and has a good touch.

Description

technical field [0001] The invention relates to the technical field of synthetic leather, in particular to the preparation and application of organic silicon-modified self-dulling water-based polyurethane for synthetic leather. Background technique [0002] Synthetic leather is a composite material that simulates the structure and performance of natural leather and can be used as a substitute for natural leather. Usually non-woven fabric is used to simulate the mesh layer, and microporous polyurethane coating is used to simulate the grain layer. The front and back of the obtained synthetic leather are very similar to leather, and have a certain degree of air permeability, which is closer to natural leather than ordinary artificial leather. Widely used in making shoes, boots, bags and ball games. [0003] The surface of synthetic leather is shiny and has a strong plastic feel. In order to make the appearance and feel of synthetic leather closer to natural leather, the surfac...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the synthetic leather surface treatment agents used are solvent-based systems, because the surface treatment will consume a large amount of solvent, and the conventional recovery rate is only 90%. The organic solvents discharged into the atmosphere have great harm to the human body and the environment. Hazards, while the residue of solvents in the product will cause product safety problems

[0005] In order to solve the above problems, the development of water-based matting surface treatment agents for synthetic leather to replace solvent-based treatment agents is the main way of technology development at present. The products are mainly water-based polyurethanes, but there are still the following problems: First, most products use Silicon is the main matting material, and it is difficult to achieve a deep and natural matting effect; secondly, to achieve a deep matting effect, a large amount of silica matting powder needs to be added, which greatly reduces the physical and mechanical properties of the surface treatment coating, making the final product The use performance is greatly reduced; third, most products feel poor