Method for preparing leather by aqueous wet method

A water-based, wet-process technology, applied in the direction of chemical instruments and methods, textiles and papermaking, synthetic resin layered products, etc., to achieve the effect of saving money and shortening the coagulation time

Inactive Publication Date: 2010-05-12
广东大盈新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a solution that can solve these problems well, does not need solvent recovery equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0010] Example one

[0011] Add 300g of water to a reaction tank, then add 50g of acetic acid or formic acid, and stir evenly. At this time, the content of acetic acid or formic acid is 14.3%. The acid bath is prepared and ready for use. On the base material of non-woven or woven fabric Smear anionic waterborne polyurethane emulsion containing 20%-45%. The application tool is a 1.5mm stainless steel rod. The anionic waterborne polyurethane emulsion is a carboxylic acid-terminated waterborne polyurethane. After the application is even, add its base material to the above-mentioned prepared acid Condense in the bath, let stand for 5 minutes, take out the condensed base material, and dry it in a ventilated place until the water volatilizes completely, that is, a qualified water-based wet leather coating is prepared, and the drying speed is measured by a stopwatch. The resulting acid The comparison between bath wet resin and traditional wet resin is as follows:

[0012] performance...

Example Embodiment

[0013] Example two

[0014] Add 400g of water to a reaction tank, then add 50g of phosphoric acid or hydrochloric acid or phosphoric acid, and stir evenly. At this time, the content of phosphoric acid or hydrochloric acid or phosphoric acid is 11.1%. The acid bath is prepared and ready for use. Apply anionic waterborne polyurethane emulsion containing 20%-45% on the base material of the non-woven or woven fabric. The application tool is a 1.5mm stainless steel rod. The anionic waterborne polyurethane emulsion is a sulfonic acid-terminated waterborne polyurethane. After the application is even, Add the base material to the above-mentioned prepared acid bath to condense, let it stand for 9 minutes, take out the condensed base material, and dry it in a ventilated place until the water volatilizes completely, that is, a qualified water-based wet leather coating is obtained. Layer, stopwatch to measure its drying speed, the obtained acid bath wet method and traditional wet method resi...

Example Embodiment

[0016] Example three

[0017] Add 500g of water to a reaction tank, then add 30g of sulfuric acid or benzenesulfonic acid, and stir evenly. At this time, the content of sulfuric acid or benzenesulfonic acid is 5.7%. The acid bath is prepared and ready for use. Apply anionic waterborne polyurethane emulsion containing 20%-45% on the base material of the non-woven or woven fabric. The application tool is a 1.5mm stainless steel rod. The anionic waterborne polyurethane emulsion is a sulfonic acid-terminated waterborne polyurethane. After the application is even, Add the base material to the above-mentioned prepared acid bath to condense, let it stand for 20 minutes, take out the condensed base material, and dry it in a ventilated place until the water volatilizes completely, that is, a qualified water-based wet leather coating is obtained. Layer, stopwatch to measure its drying speed, the obtained acid bath wet method and traditional wet method resin are compared as follows:

[0018]...

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PUM

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Abstract

The invention relates to a method for preparing leather by using an aqueous wet method, which is characterized by comprising the following steps: selecting a base material, wherein the base material is coated with an aqueous polyurethane emulsion containing 20 to 45 percent anionic waterborne polyurethane emulsion; after coating the anionic waterborne polyurethane emulsion evenly, adding the base material into a prepared acid bath field to perform agglomeration; standing the base material for 2 to 30 minutes, and taking the well agglomerated base material out; and air-drying the base material until the moisture content is completely volatilized to prepare a qualified aqueous wet-method leather coating layer. The acid bath field is prepared by adding an acidic material into deionized water, controlling the acid concentration between 1 and 50 percent, and stirring the mixture evenly for later use; and when in use, along with the descending of the acid value, the stable acid concentration of the acid bath field can be controlled by adding acid into the acid bath field. By adopting the method, the prepared wet-method leather is pollution-free, the acid bath can be used repeatedly, and the financial resources are saved.

Description

technical field [0001] The invention relates to a method for preparing leather by an aqueous wet method. Background technique [0002] Leather containing polyurethane resin, its special structure makes it have excellent chemical properties and unparalleled processing properties, such as unique flexibility, low temperature resistance, wear resistance, adhesion and high cohesive energy, etc., so this product It has a wide range of applications in many fields. However, a large amount of organic solvents will be used in the production process. For example, one is to produce polyurethane resin leather by dry process, and the solvent produced is discharged into the atmosphere; the other is to produce polyurethane resin leather by wet process. The generated solvent can be recycled, but recycling the solvent requires a lot of investment, and both safety and labor protection costs require a lot of capital investment. Contents of the invention [0003] The purpose of the present i...

Claims

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Application Information

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IPC IPC(8): D06N3/14B32B27/12B32B27/06
Inventor 曹永沂邓慕建于吉鹏龚兴宇
Owner 广东大盈新材料科技有限公司
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