Preparation method of water-soluble polyurethane leather beth

Abstract

The invention relates to a preparation method of water-soluble polyurethane leather beth. The preparation method sequentially comprises the following steps of: a step A, soaking a base fabric; a step B, removing moisture in the base fabric; a step C, calendaring the surface of the base fabric; a step D, coating a water-soluble polyurethane foaming paste on the surface of the base fabric and then drying; and a step E, carrying out wheel loading and flattening on the surface of the dried water-soluble polyurethane foaming paste. By adopting the preparation method of the water-soluble polyurethane leather beth provided by the invention, the surface evenness of the product can be improved, the production cost can be reduced, the handfeel of the product is softer, and simultaneously the product is closer to a solvent-based synthetic leather beth product in appearance performance and physical properties.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane synthetic leather base, in particular to a preparation method of using an environmentally friendly water-based polyurethane foam slurry to prepare a water-based polyurethane synthetic leather base. Background technique [0002] In the synthetic leather industry, the basic steps of the preparation method of the wet-process polyurethane synthetic leather base well known to ordinary technicians are as follows: 1. Base cloth treatment and solvent-based polyurethane slurry preparation; 2. Scratching on the treated base cloth Solvent-based polyurethane slurry and wash water through a sink to replace DMF (dimethylformamide) and water in the slurry, and the slurry solidifies to produce a microporous structure; 3. Pass the solidified slurry and base cloth through extrusion The water machine squeezes out the water and dries it in an oven. The finished product is polyurethane synthetic leather bass. ...

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned preparation method has the following defects: 1, there is a large amount of waste water and waste gas containing DMF in the production process, and DMF is harmful to the human body. Even by reclaiming DMF, some waste water and waste gas containing DMF will be discharged into the large Naturally, it causes environmental pollution around the factory and endangers the health of personnel; 2. More DMF remains in the produced polyurethane synthetic leather bass, which is easy to volatilize, and it is easy to cause harm to the environment and personnel after being produced into daily necessities

3. Waste water and waste gas generated in the production process need to be recycled by running recycling equipment, which consumes a lot of energy

But it does not involve research on the cell stability of water-based polyurethane foaming slurry, and the products produced by this preparation method have the following defects:

[0007] 3. After the water-based polyurethane foam coating is dried, its surface is not treated, which makes the surface of the product uneven, prone to uneven bubbles, pits and other defects;

[0008] 4. The stability of the cells is not controlled during the production process, resulting in defects such as different cell sizes, uneven distribution, and insufficient fineness in the foam layer of the product;

[0009] 5. The production cost is high and cannot meet the existing market demand

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