Method for filling and synthetizing full waterborne polyurethane base leather through nano attapulgite

Abstract

The invention discloses a method for filling and synthetizing full waterborne polyurethane base leather through nano attapulgite. The method includes adopting non woven fabrics as the base fabric, and soaking the non woven fabric in NaCl water solution; drying and ironing the soaked base fabric, and calendering the surface; adopting attapulgite as raw material, smashing, soaking in water, extruding through opposite rollers, aging and adding anionic waterborne polyurethane for high speed pre-dispersion; adding foaming agent, foam stabilizing agent and aqueous colorant sequentially, mixing at high speed, and obtaining waterborne polyurethane synthesis leather slurry; soaking the pretreated base fabric in the waterborne polyurethane synthesis leather slurry, scraping the surface, drying, and obtaining the waterborne polyurethane base leather. The attapulgite filler is low in cost and easy to prepare, the synergistic reinforcement effect of fibrillar attapulgite and associated minerals is played completely, the mechanical property of the synthesis base leather is improved effectively, organic solvent is omitted during production, safety and environment protection can be achieved, the process is easy and simple to implement, and large-scale production is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of preparation of water-based polyurethane leather, and in particular relates to a method for filling and synthesizing all-water-based polyurethane leather by filling nano-attapulgite clay. Background technique [0002] Polyurethane leather has the appearance of soft luster, natural, soft touch and strong genuine leather feeling. It also has the advantages of warmth, breathability and simple production process. It is widely used in clothing, shoemaking, automobiles, bags, furniture and other industries. The polyurethane resin used in the traditional polyurethane leather production and the wet tanning production process all need to use a large amount of organic solvents. These solvents are flammable and explosive, with large toxic and side effects, which not only pollute the environment, but also threaten human life and health. In recent years, as the country has higher and higher requirements for environment...

AI Technical Summary

Problems solved by technology

Chinese patent CN102634242 proposes a method for modifying halloysite nanotubes and compounding them with water-based polyurethane to prepare composite materials, using silane coupling agent to modify and purify halloysite nanotubes, and then compounding with water-based polyurethane to prepare composite materials, which significantly improves the material high tensile strength and glass transition temperature, but in the preparation, it is necessary to disperse halloysite at a low concentration in an organic solvent to modify it, resulting in low production efficiency and high energy consumption, complicated process, and unfavorable for environmental protection

Chinese patent CN102838870A proposes a soybean oil-based polyurethane / attapulgite nano-composite material and its preparation method. Nano-attapulgite is added to soybean oil polyol and isophorone diisocyanate as a filler to prepare a polyurethane composite material in situ. The tensile strength, Young's modulus and glass transition temperature of the attapulgite are all improved, but the attapulgite needs to be dispersed and dissociated in the acetone solvent during the preparation, and the attapulgite is only used as a filler in the system, and the nano-reinforcement performance has not been fully exerted

At present, there is no relevant report in the literature on the direct use of attapulgite raw ore filling to synthesize waterborne polyurethane leather bass