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Method for preparing basic chromium sulfate-chrome tanning agent by using lignite wax as reducing agent

A technology of montan wax and chromium sulfate, which is applied in the direction of chromium sulfate, small raw hide/big raw hide/leather/fur treatment, small raw hide/large raw hide/leather skin/fur chemical treatment, etc. Chromium absorption, reducing the stability of leather resistance to heat and humidity, etc., to achieve better masking effect, improve tanning effect, save sulfuric acid and reducing agents

Inactive Publication Date: 2014-03-05
南通金庆美术图案设计有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the chromium powder produced by this method contains more neutral salt (chromium sulfate), which affects the absorption of chromium by the leather, and the tanned leather is not plump, especially reducing the moisture and heat resistance of the leather.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0016] The sulfuric acid described in A, B step is the sulfuric acid solution of 30~40% by weight, the oxidizing agent described in A, B, C step is the solution of 40~60% by mass, and the reducing agent described in C step is 40% by weight ~60% solution.

[0017] The sugar is industrial glucose and / or sucrose.

[0018] A, B, and the speed of stirring described in steps C are 40 ~ 60r / min.

[0019] In steps A, B, and C, the reaction temperature is strictly controlled at 105~115°C. When the temperature of the reaction solution is >115°C, turn on the cooling water in the reactor to cool down. When the temperature is <105°C, switch to steam to supplement heat.

[0020] Working principle of the present invention:

[0021] The invention includes first and second stages of oxidation and oxidation solution preparation process, each process adopts different oxidizing agents and reducing agents, optimizes raw material ratio, feeding process and reaction parameters, and prepares basic ...

Embodiment 1

[0023] In one-stage oxidation, raw materials are prepared according to the mass ratio of montan wax: sodium dichromate: sulfuric acid 1:2:3. First put montan wax and sulfuric acid into the reaction kettle, heat to 95°C to melt and acidify for 1 hour, then slowly add sodium dichromate solution, strictly control the reaction temperature at 105-115°C, stir and oxidize at 50r / min for 5 hours. Stop stirring, stand still, settle for 1 hour, and release a period of oxidation waste liquid after layering;

[0024]In the second-stage oxidation, prepare materials according to the mass ratio of montan wax: sodium dichromate: sulfuric acid 1:0.5:2. First put montan wax and sulfuric acid into the reaction kettle, heat to 95°C to melt and acidify for 0.5h, then slowly add sodium dichromate solution, strictly control the reaction temperature at 105~115°C, stir at 50r / min, and oxidize for 2.5 h. Stop stirring, stand still, and settle for 1 hour. After stratification, release the second-stage...

Embodiment 2

[0027] In one-stage oxidation, raw materials are prepared according to the mass ratio of montan wax:potassium dichromate:sulfuric acid 1:1.5:2. First put montan wax and sulfuric acid into the reaction kettle, heat to 90°C to melt and acidify for 1 hour, then slowly add potassium dichromate solution, strictly control the reaction temperature at 105-115°C, stir and oxidize at 40r / min for 6 hours. Stop stirring, stand still, settle for 1 hour, and release a period of oxidation waste liquid after layering;

[0028] In the second-stage oxidation, prepare materials according to the mass ratio of montan wax:potassium dichromate:sulfuric acid 1:0.8:2.5. First put montan wax and sulfuric acid into the reaction kettle, heat to 100°C to melt and acidify for 0.5h, then slowly add potassium dichromate solution, strictly control the reaction temperature at 105~115°C, stir and oxidize at 60r / min for 2h. Stop stirring, stand still, and settle for 1 hour. After stratification, release the sec...

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PUM

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Abstract

The invention discloses a method for preparing a basic chromium sulfate-chrome tanning agent by using lignite wax as a reducing agent. The method comprises the processes of primary oxidation, secondary oxidation and oxidation liquid modulation, wherein the primary oxidation comprises the steps of acidizing the lignite wax for 1 hour and then stirring and oxidizing for 4-6 hours; the secondary oxidation comprises the steps of acidizing the primary oxidation liquid for 20-40 minutes and then stirring and oxidizing for 2-3 hours; the method further comprises the steps of adding the primary oxidation liquid and the secondary oxidation liquid into a reaction kettle, determining the adding amount of an oxidizing agent and a reducing agent, adding the oxidizing agent and the reducing agent into the reaction kettle sequentially and slowly, strictly controlling the reaction temperature at 105-115 DEG C, stirring and oxidizing for 1-2 hours, standing, ageing, spray-drying and forming to obtain the basic chromium sulfate-chrome tanning agent. Compared with the pure sugar reducing agent, the neutral salt content of the basic chromium sulfate-chrome tanning agent is reduced by above 30 percent, the chrome absorption quantity of leather is enhanced, and the plumpness and humidity-resistant and heat-resistant stability of the leather are improved. The basic chromium sulfate-chrome tanning agent comprises organic micromolecular acid with a good masking effect, particularly sulfonated phthalic acid, so that the leather is plump and soft, and has elasticity, natural brightness and wax feel.

Description

technical field [0001] The invention belongs to the technical field of montan wax application, and in particular relates to a method for preparing high-quality and high-performance basic chromium sulfate-chrome tanning agent by using montan wax as a reducing agent. Background technique [0002] Whether it is the production of chromium powder with montan wax reducing agent, or the production of light-colored refined wax (S wax-high carbon fatty acid) by the red alum method, it is faced with the problem of processing the oxidizing solution into basic chromium sulfate-chromium powder. Therefore, the quality and performance of chromium powder are directly related to the economy and feasibility of the project. At present, the chromium powder produced by this method contains a lot of neutral salt (chromium sulfate), which affects the absorption of chromium by the leather, and the tanned leather is not plump, especially reducing the moisture and heat resistance stability of the lea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/08C14C3/06
Inventor 刘长胜
Owner 南通金庆美术图案设计有限公司
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