Synthesis process of a high-performance self-crosslinking waterborne polyurethane self-dulling resin

Abstract

The invention discloses a synthesis process of a high-performance self-crosslinking waterborne polyurethane self-dulling resin, which comprises the following steps: taking WPU1 and WPU2, adding them to a dispersion device according to the mass ratio of 1:0.1-0.3, and then adding the total mass of WPU1 and WPU2 0.5-2% silicone leveling agent, 0.05-0.1% defoamer, 0.5-2% polyurethane associative thickener, adjust the viscosity at 25°C to 800-2000mPa.s, and obtain high Properties Self-crosslinking waterborne polyurethane self-matting resin. The invention realizes normal temperature cross-linking through the emulsion in the film-forming process to form a relatively sticky polymer-polymer molecule, which increases the effective adhesion between particles and improves the film-forming property and permeability of the coating. Sex, adhesion to the base material, scratch resistance, and good chemical resistance; in the process, the production efficiency has been greatly improved, and the economic benefits have been greatly increased.

Description

technical field [0001] The invention relates to a synthesis process of a high-performance self-crosslinking waterborne polyurethane self-extinction resin, belonging to the field of waterborne polyurethane coatings. Background technique [0002] Leather finishing agent is a product for post-processing synthetic leather to give synthetic leather a special luster and feel. Matting finishing agent has a softer, natural and elegant appearance, and is widely used in leather finishing, paper finishing coating, printing glue, textile coating, special coating, etc. [0003] The traditional matting water-based polyurethane resin is to add fillers, micro-wax powder, inorganic silica and other matting agents to the polyurethane dispersion. After the coating film is dried, the matting agent floats on the surface of the coating film to produce microscopic unevenness, so as to achieve the matting effect. . However, the external addition of matting powder leads to the instability of the s...

AI Technical Summary

Problems solved by technology

However, the latex particles of the coating are relatively large, and the latex particles cannot be well fused during the film forming process, resulting in imperfect film formation, resulting in a decrease in the physical and chemical properties of the coating film, low strength, poor adhesion to the substrate, and poor permeability. To show the color of the coating film substrate, there will be foggy phenomenon. In order to avoid this situation, it is necessary to add a large amount of crosslinking agent, such as aziridine, isocyanate or blocked crosslinking agent, etc., to strengthen the polyurethane particles. Adhesion, improve the film-forming properties of the coating, such as scratch resistance, abrasion resistance, weather resistance, etc.

[0005] Aziridine and isocyanate cross-linking agents are two-component, generally must be used up within 12 hours, expired and invalid, it is extremely inconvenient for customers to use, if they are not used up in time under special circumstances, certain economic losses will be caused; closed delivery The linking agent needs a high temperature above 110°C, and the cross-linking effect can be achieved after about 20 minutes of unsealing, which consumes a lot of energy, so the economic benefit decreases