Water-borne polyurethane synthetic leather foaming slurry

Abstract

The invention belongs to the field of synthetic leather material techniques and synthetic leather manufacturing, and particularly relates to water-borne polyurethane synthetic leather foaming slurry.The foaming slurry comprises, by weight, 100 parts of water-borne polyurethane emulsion, 10-15 parts of inorganic nano-whiskers, 0.1-0.5 part of modified foaming agents, 0.3-0.8 part of water-borne cross-linkers, 0.05-0.2 part of flatting agents, 0.05-0.2 part of defoaming agents and 0.1-0.5 part of thickening agents. A preparation process of the foaming slurry includes the steps: grinding sepiolite, and sieving the grinded sepiolite powder by a sieve with meshes of 600-800; mixing foaming agents and the grinded sepiolite powder; ultrasonically treating mixture for 30-40min; adding silane coupling agents, and continuing to ultrasonically treat mixture for 10-20min. According to the water-borne polyurethane synthetic leather foaming slurry, the modified foaming agents are introduced into the foaming slurry, bubble hole forming sources are uniformly designed, and dispersibility and uniformity of bubble holes in water-borne polyurethane synthetic leather products are improved, so that fullness and air permeability of a finished product are ensured.

Description

technical field [0001] The invention belongs to the field of synthetic leather material technology and synthetic leather manufacture, and in particular relates to a water-based polyurethane synthetic leather foaming slurry. Background technique [0002] PU synthetic leather was produced in the late 1970s and developed in the 1990s. In the traditional production of PU synthetic leather, PU resin with organic solvents is used as the base layer and surface layer of leather products. This type of PU resin is based on toluene, xylene, acetone, methyl ethyl ketone, acetic acid, ethyl ester and dimethyl These organic solvents have high toxic and side effects, which not only cause environmental pollution and harm the body, but also are flammable and explosive, and can easily cause accidents such as fires. For this reason, it is imperative to eliminate the pollution of PU synthetic leather industry from the source. [0003] Polyurethane is the abbreviation of polyurethane formate. ...

AI Technical Summary

Problems solved by technology

However, since the production and processing processes of artificial leather and synthetic leather are completely different from leather processing and textile coating processing, it is far from enough to only choose to meet the film-forming properties. Good compatibility and compatibility of additives, leveling and spreading properties, as well as anti-adhesive and anti-adhesive properties of water-based polyurethane, and water resistance are all factors that need to be considered during processing

[0004] In the prior art, the coating made directly by water-based polyurethane film formation is too thin, which cannot achieve the tactility and fullness similar to that of leather. Foaming is an effective way to solve the problem of thin coating, poor plumpness and poor air permeability.

At present, foaming technology can be divided into chemical foaming and physical foaming. Chemical foaming uses a foaming agent such as AC (azodicarbonamide) to release one or more gases in a chemically decomposed manner, thereby promoting polymer foaming. The matrix is ​​foamed, but the dispersion effect of the chemical foaming agent in the polymer matrix and the uniformity of the foamed cells are not easy to control, which will easily lead to defects such as poor cell structure, which will affect the performance of the final polyurethane synthetic leather product

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