Water-soluble polyurethane dispersoid slurry and method for preparing wet method base thereof

Abstract

The invention discloses water-soluble polyurethane dispersoid slurry and a method for preparing a wet method base thereof. Water-soluble polyurethane dispersoid in the slurry is negative non-ionic type polyurethane dispersoid prepared by an acetone method; after foaming, the water-soluble polyurethane dispersoid slurry is smeared on a base cloth, and then a flocculation and solidification process is conducted; the flocculation ability of the water-soluble polyurethane dispersoid slurry is good in flocculation liquid; and the water-soluble polyurethane base which is dense in surface and good in handfeel is obtained. The preparation method for the water-soluble wet method base is similar to a preparation method of a solvent type wet method base, except that DMF in the flocculation liquid is replaced with water, and the preparation method is an ecological leather synthetic method. The production process is environmentally friendly and free of pollution, continuous production is achieved, operation is easy, the preparation method is efficient, and meanwhile, the obtained water-soluble wet method base is comparable to the solvent wet method base in leather texture and can replace an oiliness wet method base.

Description

technical field [0001] The invention relates to a water-based polyurethane dispersion slurry for preparing wet-process bass, and also relates to a method for preparing wet-process bass from aqueous polyurethane. Background technique [0002] In the fields of shoes, bags, and clothing, it is the general trend for synthetic leather to replace genuine leather, which is expensive and has limited resources. [0003] At present, the production and processing of the entire synthetic leather industry is based on the base of solvent-based polyurethane, and a large amount of organic solvents are used in the production process, such as dimethyl formamide, methyl ethyl ketone, acetone, toluene, ethyl acetate, etc. And waste water is discharged into the environment, causing great harm to the environment and human body. [0004] The production of traditional synthetic leather bass is mainly wet method and dry method. The traditional wet method uses solvent-based polyurethane, which will ...

AI Technical Summary

Problems solved by technology

[0005] In recent years, many water-based polyurethanes prepared by dry process have appeared on the market. However, due to the influence of factors such as fullness, peel strength and difficulty in controlling the cell structure of the bases prepared by the dry process, the water-based bases prepared by the dry process The feeling of muscle formation is not strong, the internal quality of the product has no room for improvement, and it cannot meet the high requirements of consumers for synthetic leather products.

[0006] Using traditional technology, it is impossible to solidify water-based polyurethane in water to form a continuous dense bass, which limits the application of water-based polyurethane in wet-process bass

[0007] CN102787510A and CN102797165A provide metal salt ions to treat the base cloth, adopt water-based polyurethane slurry, scrape and coat it on the base cloth in a direct foaming manner to obtain water-based polyurethane base, but the drying speed of the resin in this method is slow, and the implementation process efficiency is low; CN103343457A has described the preparation method about water-based polyurethane wet-laid bass, is directly coated on untreated base cloth with polyurethane slurry, uses polyalumina as the flocculation coagulation liquid, heat-cures to obtain water-based wet-laid bass, this method On the basis of solving the production efficiency, the obtained bass has a poor hand feeling, which cannot be compared with solvent-based wet bass

[0010] (1) The hand feeling of the water-based wet bass obtained by the current process is poor, which is not comparable to that of the solvent-based bass, and the construction efficiency is low;

[0011] (2) The water-based polyurethane dry-fabricated base has a weak sense of muscle formation, and the product cannot meet the increasingly stringent market requirements

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