Water-borne polyurethane coating agent containing superfine down fiber-polylactic acid microspheres

Abstract

The invention discloses a water-borne polyurethane coating agent containing superfine down fiber-polylactic acid microspheres. The superfine down fiber-polylactic acid microspheres are prepared by the following steps of treating down fibers into superfine fibers with high surface activity and high thermal stability; mixing the superfine fibers with a polylactic acid solution, wherein the superfine fibers can adsorb the polylactic acid solution by using good adsorbability of the superfine fibers; subsequently, separating out the polylactic acid by using absolute ethyl alcohol serving as a poor solvent, thus obtaining composite microspheres. The composite microspheres have air and moisture permeability of the down fibers and biocompatibility of the polylactic acid; by using the composite microspheres, the defect that superfine down fibers easily absorb moisture is overcome, the moisture and air permeability of a traditional polyurethane coating can be effectively improved, a coating with flexibility, skin friendliness, and bacteria and mildew resistance is obtained, and use experience of fabric is remarkably improved; in addition, the coating can be biodegraded and recycled.

Description

technical field [0001] The invention relates to the technical field of textile coating finishing agents, in particular to a water-based polyurethane coating agent containing ultrafine down fiber-polylactic acid microspheres. Background technique [0002] Textile coating finishing agent, referred to as coating agent, is a polymer compound film coated on the surface of the fabric to improve the style, feel and appearance of the fabric, etc., which greatly increases the added value of the textile. Water-based polyurethane coating agent is an important class of environmentally friendly coating agent, which has the advantages of excellent elasticity, soft hand feeling, wear resistance and solvent resistance, etc., but its moisture permeability is poor, which seriously affects the wearing experience of fabrics, and the production cost is high. With the improvement of market demand, it is particularly important to study waterproof and breathable environmentally friendly polyurethan...

AI Technical Summary

Problems solved by technology

Water-based polyurethane coating agent is an important class of environmentally friendly coating agent, which has the advantages of excellent elasticity, soft hand feeling, wear resistance and solvent resistance, etc., but its moisture permeability is poor, which seriously affects the wearing experience of fabrics, and the production cost is high. With the improvement of market demand, it is particularly important to study waterproof and breathable environmentally friendly polyurethane fabric coating agents

"Preparation and Application of Silk Fibroin / Polyurethane Waterproof and Moisture-permeable Coating Agent" uses silk fibroin to modify polyurethane, which effectively improves the moisture permeability of the coating agent. However, the hydrophobicity of silk fibroin is poor. As the mass fraction of centrin increases, the water resistance of the coating film will deteriorate, and the production cost of silk fibroin is high, which is not conducive to large-scale production

[0003] my country is a big down producing country, and its annual output is far ahead of other countries. Down is a natural protein material with a multi-group amino acid peptide chain structure. The crude protein content accounts for more than 80% of the entire down. Its structure is fluffy and soft, and it has excellent warmth retention. , with good hygroscopicity and biocompatibility, however, the research and utilization of its resource utilization is still at the level of rough processing of raw materials, except for a small amount of thermal filling materials used in clothing and bedding, and some used in sports Supplies, handicrafts and reinforcement materials for composite materials are mostly treated as waste, causing a lot of waste of resources