Formula and process for producing ecological synthetic leather by adopting waterborne polyurethane foaming coating

Abstract

The invention discloses a formula for producing ecological synthetic leather by adopting a waterborne polyurethane foaming coating. The formula comprises coating liquid, wherein the coating liquid is prepared from the following components at ratio: 52%-90.2% of waterborne polyurethane emulsion, 3%-15% of a filling agent, 2%-10% of ammonium stearate emulsion, 0.3%-0.5% of a foaming agent, 1%-3% of a penetrating agent, 1%-5% of a flatting agent, 0.5%-5% of color paste, 1%-3% of ammonia water and 1%-2% of a thickening agent. The process comprises the following steps: adding the raw materials in the formula; stirring and filtering; adjusting viscosity to obtain the coating liquid; preparing the coating liquid into a coating foam body; coating the coating foam body to leather base cloth; drying to obtain foaming bass; and carrying out after-treatment to obtain the polyurethane ecological synthetic leather. The product is strong in skin feeling, soft in hand feeling and good in stripping resisting fastness; the moisture content in the coating liquid is relatively low so that drying energy consumption and water resources are greatly saved; and no sewage and waste gas are produced in a production process and the environment-friendly performance is good.

Description

【Technical field】 [0001] The invention relates to the technical field of finishing technology for synthetic leather, in particular to the technical field of a formula and process for producing ecological synthetic leather with a water-based polyurethane foam coating. 【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 th...

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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] There are two types of synthetic leather currently on the market: oily and water-based. Oil-based synthetic leather is being phased out due to the use of a large amount of solvents. There is also a so-called water-based synthetic leather production process that uses water-based polyurethane first on the leather base cloth. Carry out coating, and then solidify and solidify in water containing calcium chloride, because there will be a certain amount of gas generated during the solidification process, which will relatively improve the feel of the bass, but the effect is not very obvious, and the production A large amount of waste water will be generated during the process to pollute the environment. Furthermore, due to solidification and solidification in water, the controllability of the production process is difficult to grasp, the quality is very unstable, and the drying energy consumption is also large, so this technology is basically impossible. Promote application

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