Water-borne polyurethane foam layer for synthetic leather and preparation method for water-borne polyurethane foam layer

Abstract

The invention provides a water-borne polyurethane foam layer for synthetic leather. Based on total material mass, the water-borne polyurethane foam layer is prepared by mixing or foaming the following raw materials: (1) 12 to 61.9 percent of water-borne polyurethane resin (based on dry basis of a solid), (2) 0.1 to 24 percent of organic resin hollow microspheres, (3) 10 to 87 percent of water, (4) 0.05 to 5 percent of emulsifying agent, (5) 0 to 5 percent of foaming agent, (6) 0.05 to 5 percent of foam stabilizer, (7) 0.05 to 5 percent of crosslinking agent, (8) 0.05 to 5 percent of levelling agent, (9) 0 to 5 percent of colorant, (10) 0 to 5 percent of filler and (11) 0.05 to 5 percent of thickening agent. The formula has the advantages of high compatibility among the components and good foaming effect. The water-borne polyurethane foam layer for the synthetic leather has good film forming property and stable foam holes; and the synthetic leather has fine texture, smooth surface, and good handfeel, water resistance and adhesion resistance.

Description

technical field [0001] The invention relates to a water-based polyurethane foam layer for synthetic leather, and also relates to a preparation method thereof. Background technique [0002] Solvent-based resins contain a large amount of volatile organic solvents (VOC), which are harmful to human health during use, and also cause waste of resources and energy. At present, the production and processing of the entire synthetic leather industry is based on solvent-based polyurethane as the main wet or dry preparation method, 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. These solvents are extremely harmful to the human body. Water-based polyurethane resin uses water as the dispersion medium, has the advantages of non-toxic, environmental protection, safety, and non-combustibility, and is the best substitute for solvent-based resins. However, the current water-base...

AI Technical Summary

Problems solved by technology

However, the current water-based synthetic leather dry process production line adopts external foaming, that is, mechanical foaming, to produce the foam layer for synthetic leather. uniform, resulting in unsatisfactory appearance and mechanical strength of the foam layer

[0003] CN102080332A provides a manufacturing method of water-based polyurethane synthetic leather base. The method adopts the method of adding foaming agent and foam stabilizer to prepare synthetic leather base by mechanical foaming. The disadvantage of this method is that the water-based polyurethane prepared by mechanical foaming is used. During the heating and drying process of polyurethane foam, after the air in the foam is heated and expanded, it is easy to fuse and rupture the foam, thus forming larger cells

[0005] CN101522983 provides a method for preparing breathable multilayer synthetic leather and breathable multilayer synthetic leather. Similar to CN102080332A, the method uses mechanical foaming to prepare a foam layer for synthetic leather, and the cells of the foam layer are prone to unevenness And it is easy to break during the construction process

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