Production method of soft vegetable leather

Abstract

The invention discloses a production method of soft vegetable leather. The production method comprises the following steps: S1, rinsing; S2, surface dyeing; S3, retanning and neutralizing: adding 1-3WT% of sodium formate and 1-3WT% of neutralizing tannin at the liquor ratio of 140-160% and the temperature of 36-38 DEG C, rotating for 28-32 minutes under the condition of 10-14 revolutions / min, adding 0.4-0.6 WT% of baking soda, rotating for 18-22 minutes, adding 1-3WT% of replacement tannin and 0.8-1.2 WT% of sulfitation cattle hoof oil, rotating for 75-85 minutes, stopping the drum overnight, controlling the PH to be 4-5, and completely neutralizing; S4, filling: adding 3-5WT% of a dicyandiamide resin tanning agent, 3-5WT% of melamine resin, 8-12WT% of quebracho extract and 1-4WT% of a composite tanning agent at the liquid ratio of 48-52% and the temperature of 38-42 DEG C, rotating for 35-45 minutes, adding 6-10WT% of acrylic resin, 6-8WT% of tara tannin and 0.8-1.2 WT% of an electrolyte-resistant fat liquor, rotating for 50-70 minutes, adding 5-7WT% of schizonepeta bark glue and 1-3WT% of dispersed tannin, continuously rotating for 110-130 minutes, adding 1-3WT% of composite dye, and rotating for 50-70 minutes; S5, performing fat liquoring; S6, performing color fixation; and S7, finishing and drying. Compared with the prior art, the method has the following advantages: 1, the requirement on wet blue leather is low; 2, the use amount of the vegetable tanning agent is reduced; and 3, the leather body is lifted.

Description

technical field [0001] The invention relates to a production method of leather, in particular to a production method of soft vegetable tanned leather. Background technique [0002] The conventional vegetable tanning method is a traditional and ancient tanning technology, which has undergone continuous evolution and improvement for decades. From the progress of various aspects such as tanning equipment, chemical materials and production methods. Product quality and variety diversification have been greatly improved, but a significant leather characteristic of vegetable tanned leather, commonly known as "button feel" (that is, vegetable tanned feel), is that it feels stiff and has low physical properties (tear strength). One feature leads to a narrow scope of application of the product. There are few technical solutions that can solve this problem in the prior art. In view of this, the inventor of the present application obtained a production method of soft vegetable tanned...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a production method of soft vegetable tanned leather, which solves the shortcomings of the original vegetable tanned leather, such as stiffness and low physical properties, on the basis of maintaining the vegetable tanned feeling