Self-foaming waterborne polyurethane resin emulsion and preparation method thereof

Abstract

The invention provides a self-foaming waterborne polyurethane resin emulsion and a preparation method thereof. The waterborne polyurethane resin emulsion is prepared from the following raw materials:polyol, polyisocyanate, a hydrophilic chain extender, a small molecular alcohol chain extender, an organic silicon or fluorine-containing compound containing active hydrogen, an amine chain extender,a catalyst and a salt forming agent. According to the invention, the silicon-containing or fluorine-containing nonionic surfactant is introduced into a molecular chain, so that the waterborne polyurethane resin can be self-foamed under the action of high shearing force, the production process of synthetic leather is simplified, the production cost is greatly reduced, the production efficiency is effectively improved, and meanwhile, the situation that an external foaming agent and a foam stabilizer are easy to separate out is avoided.

Description

technical field [0001] The invention relates to the field of water-based polyurethane, in particular to a self-foaming water-based polyurethane resin emulsion and a preparation method thereof. Background technique [0002] Synthetic leather is a kind of material with a feel and performance close to natural leather. Its main components are base fabric, foam layer, bonding layer and surface layer. Among them, the foam layer can bring fullness to the synthetic leather, and at the same time, it can bring different performances to the synthetic leather according to the adjustment of the foaming ratio, which is an indispensable part of the synthetic leather. [0003] The foam layer of synthetic leather is also called bass layer, and its preparation process mainly includes dry process and wet process. Although the dry process is very different from the wet process, the performance requirements of the resin itself are also different. However, the slurry needs to be foamed to a cer...

AI Technical Summary

Problems solved by technology

At present, the water-based polyurethane resin used in the factory cannot foam and stabilize foam by itself, which has limited the development of synthetic leather to a certain extent.

[0004] Patent CN 106947048 A discloses a water-based polyurethane resin used to prepare water-based garment leather bases. The bases obtained through this resin are soft to the touch and high in fullness, but foaming agents and foam stabilizers need to be added to the production formula of the bases For foaming and foam stabilization, the production process is cumbersome. At the same time, most of the foaming agents and foam stabilizers are surfactants with small molecular weights. There is a risk of precipitation in the finished synthetic leather, which will eventually affect the quality of the product.

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