Foaming synthetic leather manufacturing technology based on waterborne polyurethane (WPU)

Abstract

The invention provides a foaming synthetic leather manufacturing technology based on waterborne polyurethane (WPU). In the manufacturing technology, the WPU is taken as a main raw material, and a hollow microsphere foaming agent is taken as a foaming material; and the technology can be widely used for manufacturing synthetic leathers such as clothing leathers, luggage leathers, shoe upper leathers, sofa leathers, home interior trim leathers and the like. The content of volatile organic compounds (VOC) in the finished leather is lower than 2mg/kg (leather), and the air permeability and moisture penetrability are good, thus meeting the EU (European Union) requirements for the ecological synthetic leather; and in addition, the foaming synthetic leather has the advantages of moderate foaming multiplying power, uniform and compact foaming holes, bulky and firm hand feel as well as good comprehensive performance which is equivalent to or superior to that of a solvent-borne product. The foaming synthetic leather manufacturing technology based on the WPU provided by the invention has the beneficial effects that by adopting the WPU instead of the traditional solvent-borne PU, organic pollution is eliminated from a source, organic solvent resources are saved, the comprehensive energy consumption is lowered, the employment environment of laborers is improved, and the ecological grade of the synthetic leather and the international market competitiveness of the product are enhanced, thus achieving obvious innovativeness and remarkable social and economic benefits.

Description

technical field [0001] The invention relates to an environmentally friendly synthetic leather microsphere foaming technology, which belongs to the field of synthetic leather (PU leather) manufacture. Background technique [0002] With the improvement of people's living standards, people gradually pursue high-quality daily products, and the demand for leather products is increasing. With the increasing awareness of animal protection, animal leather can no longer meet people's needs. At present, synthetic leather products have gradually become a popular trend in the future. PU synthetic leather has the advantages of exquisite appearance, low price, good physical properties, breathability, and moisture permeability. It has been widely used in the production of luggage, clothing, footwear, furniture, sporting goods, etc. , the synthetic leather industry has also become a pillar industry of the light industry. [0003] Traditional synthetic leather manufacturing processes mainl...

AI Technical Summary

Problems solved by technology

The uniformity of bubble size and production efficiency produced by mechanical stirring and foaming have been greatly improved in recent years, but in the foaming process, it is required that the water-based resin has a high solid content (more than 50%), and it is necessary to add a foam stabilizer to stabilize the foam. Additives such as additives have defects such as high cost, high process requirements, and difficult control of cell uniformity. Since the 1990s, they have not been used on a large scale.