Formula and process of antibacterial photocatalyst aqueous polyurethane synthetic leather

Abstract

The invention discloses a formula of an antibacterial photocatalyst aqueous polyurethane synthetic leather. The antibacterial photocatalyst aqueous polyurethane synthetic leather comprises a coating liquid, which comprises 12.4-88.2799% of an aqueous polyurethane emulsion, 15-35% of a filler, 3-10% of an ammonium stearate emulsion, 0.5-1% of a foaming agent, 0.5-3% of nanometer titanium dioxide, 1-5% of nanometer silica, 0.0001-0.01% of graphene, 0.5-2.5% of a leveling agent, 1-3% of an anti-sticking agent, 0.5-1% of ammonia water, 0.02-8% of an aqueous pigment paste, and 0.5-1.5% of a thickener. The preparation process comprises: adding the raw materials of the formula, stirring, filtering, and adjusting the viscosity to obtain a coating liquid; preparing a coating foam body from the coating liquid, and coating a leather base cloth with the coating foam body; drying; and carrying out post-treatment and surface treatment to obtain the finished product. According to the present invention, with the preparation process, the obtained synthetic leather has advantages of self-cleaning property, ultraviolet resistance and antibacterial ability, and the fastness and the hand feeling of thesynthetic leather are not affected.

Description

【Technical field】 [0001] The invention relates to the technical field of water-based synthetic leather finishing technology, in particular to the technical field of the formulation and process of an antibacterial photocatalyst water-based polyurethane synthetic leather. 【Background technique】 [0002] As a major producer of artificial leather and synthetic leather, my country is facing increasing pressure while the output of enterprises and total industrial output value are growing steadily, especially for exporting to the European market. The European Chemicals Agency officially announced the eighth batch of candidate list of substances of very high concern, including N,N-dimethylformamide (DMF). The promulgation of this regulation has once again put forward a severe test for synthetic leather manufacturers. [0003] my country's production enterprises basically use traditional solvent-based polyurethane resins to manufacture synthetic leather. Most of the solvents used as...

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Problems solved by technology

These solvents cannot be completely recovered at present, not only causing environmental pollution on the product side, but also seriously endangering the health of employees during the production process

[0004] It has become a development trend for water-based synthetic leather to replace traditional oil-based synthetic leather. Now a large number of so-called water-based synthetic leathers have emerged on the market, but generally speaking, these water-based synthetic leathers are not really ecological water-based synthetic leathers that can replace oil-based synthetic leather. Many manufacturers use Products that have been subjected to water-based polyurethane dry-process veneer on oily basses are pretended to be water-based synthetic leather; some also use wet-process water coagulation process, which produces a large amount of industrial wastewater in the production process, and the direct formula causes serious pollution to the environment. High consumption, poor production controllability, high recycling cost, unstable product quality, and immature technology; there are also some dry processes that use release paper transfer, which applies water-based polyurethane slurry to release paper. , transfer the foam layer, adhesive layer, and surface layer to the leather base cloth three times, the cell stability and uniformity are poor, the crease resilience of the coating, the pattern retention and shape retention of the coating after water kneading are also poor Need to improve, one side of the release paper is permeable, the drying speed is slow, the production efficiency is low, and a large amount of release paper will lead to an increase in production costs

[0005] In addition, the existing oily and water-based synthetic leathers have relatively single functions and do not have antibacterial and anti-ultraviolet functions. If you simply paste an antibacterial layer or apply an antibacterial material, it will affect the feel and air permeability of the finished leather

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