Green coating method based on heavy-metal-free tanned cow crust leather

Abstract

The invention discloses a green coating method based on heavy-metal-free tanned cow crust leather. The method comprises the following procedures: to-be-coated crust leather preparation, first milling, toggling, pre-priming coat spraying, priming coat spraying, ironing, intermediate coat spraying, isolation layer spraying, ironing, standing, second milling, oscillation staking, top coat spraying, ironing, oscillation staking, hand feeling layer spraying and finished leather obtaining, wherein the coating agent components in the priming coat spraying process and the intermediate coat spraying process are the same, each coating agent component comprises an improved polyacrylic acid copolymer composite emulsion, an aliphatic polyurethane resin dispersion liquid, a water-resistant non-expansive polyacrylic acid copolymer emulsion, a cold-resistant zigzag polyacrylic acid resin emulsion and a self-crosslinking polyacrylic acid copolymer emulsion, and the coating agent in the top coat spraying process comprises a resin film-forming agent. According to the invention, the water absorption of the heavy-metal-free tanned cow finished leather is greatly reduced, the heavy-metal-free tanned cow finished leather has good waterproof and antifouling properties, and the coating has good dry/wet rubbing resistance, wear resistance, bending resistance and gluing resistance.

Description

technical field [0001] The invention relates to the technical field of tanning, in particular to a green finishing method based on heavy metal-free tanned cow leather. Background technique [0002] Tannery industry is one of the important traditional characteristic industries in my country and has a long history. In recent years, with the rapid development of my country's economy and the continuous expansion of the total amount, labor, resources and the environment have entered an era of high cost and shortage. Therefore, the tanning industry needs to widely adopt clean production and energy-saving and emission-reduction technologies, and gradually eliminate high-energy-consuming and high-pollution production technologies and processes, so as to realize the positive interaction between economic development, energy utilization and environmental protection, and promote the healthy and sustainable development of the industry. . [0003] Heavy metal-free tanning technology bel...

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Problems solved by technology

[0004] The embodiment of the present application provides a green finishing method based on heavy metal-free tanned cow leather, which solves the technical problem in the prior art that the heavy metal-free tanned leather is too water-absorbing, resulting in poor adhesion between the coa

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