White leather tanning agent and production method thereof
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A production method and technology for a leather tanning agent are applied in the field of chrome-free tanning agent and its synthetic production process, which can solve the problems of poor thermal stability of the chrome-free main tanning agent, and achieve prolonging the shelf life, the storage time at room temperature, and the storage time of the finished product. prolonged effect
Active Publication Date: 2009-05-20
德瑞(常州)特种材料有限公司
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Abstract
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Problems solved by technology
[0008] The purpose of the present invention is to provide an improved solution for the poor thermal stability of chrome-free main tanning agent products caused by the prior art, so as to promote the early realization of industrial production of this type of products
Method used
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Embodiment 1
[0026] The first step: 61kg alcohol amine is added with stirring, in the reactor of thermometer and reflux condenser and vacuum distillation device;
[0027] The second step: heat up to 30-40°C;
[0028] The third step: drop 30kg paraformaldehyde;
[0029] Step 4: Add 1kg of sodium borate solution, and keep warm for 2 hours after adding;
[0030] Step 5: At a temperature of 50-90°C and a pressure of -0.3 bar—-0.95 bar, carry out vacuum distillation for 6 hours to remove water, and obtain a colorless to light yellow product, which can be stored at room temperature.
Embodiment 2
[0032] The first step: 61kg alcohol amine is added with stirring, in the reactor of thermometer and reflux condenser and vacuum distillation device;
[0033] The second step: heat up to 30-40°C;
[0034] The third step: add 2kg of sodium borate solution;
[0035] Step 4: Add 46kg of acetaldehyde dropwise, and keep warm for 4 hours after adding;
[0036] Step 5: At a temperature of 50-90°C and a pressure of -0.3 bar—-0.95 bar, carry out vacuum distillation for 4 hours to remove water, and obtain a colorless to light yellow product, which can be stored at room temperature.
Embodiment 3
[0038] The first step: 61kg alcohol amine is added with stirring, in the reactor of thermometer and reflux condenser and vacuum distillation device;
[0039] The second step: heat up to 30-40°C;
[0040] The third step: add 1.2kg boric acid, add 0.8kg sodium hydroxide (95%) after stirring;
[0041] Step 4: Add 100kg of glutaraldehyde dropwise, and keep warm for 4 hours after adding;
[0042] Step 5: At a temperature of 50-90°C and a pressure of -0.3 bar—-0.95 bar, carry out vacuum distillation for 4 hours to remove water, and obtain a colorless to light yellow product, which can be stored at room temperature.
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Abstract
The invention discloses a chromium-free tanning agent in the tanning industry and a synthetic production process thereof; the formula (weight ratio) comprises: 60-150 parts of amide containing hydroxymethyl, 30-100 parts of aliphatic aldehydes, and 1-5 parts of anti-yellowing agent. The production method comprises the following steps: in the first step, 60-150 parts of amide containing hydroxymethyl are added into a reaction kettle with a stirring function, a thermometer, a reflux condenser and a vacuum distillation unit; in the second step, temperature is raised to 30 to 40 DEG C; in the third step, 30-100 parts of aliphatic aldehydes are dripped; in the fourth step, 1-5 parts of anti-yellowing agent are added with 2-4 hours of heat insulation; and in the fifth step, decompression distillation is carried out for 4-6h at the temperature of 50-90 DEG C and the pressure of -0.3bar-0.95bar for removing the water. The third step and the fourth step can be exchanged. The invention solves the color changing problem in the production and storage processes of the products, adds a small amount of anti-yellowing material alkali metal and the borate solution of alkaline earth metal, greatly improves the storage conditions of the 'oxazolidine' type tanning agent, and prolongs the quality guaranteeing time; as the anti-yellowing material has low price, is easy for acquisition, and has small adding amount, the invention does not affect the application characteristics of the products and can be widely promoted.
Description
technical field [0001] The invention relates to a chrome-free tanning agent in the leather industry and a synthesis production process thereof, which belongs to the technical field of fine chemicals. Background technique [0002] At present, wet blue leather tanned with chrome is still the mainstream in the leather industry, and there is no material that can completely replace chrome powder. However, as humans pay more and more attention to the environment and health, the carcinogenic and gene mutation effects of a large amount of unabsorbed trivalent chromium and hexavalent chromium in the chrome tanning process on humans and organisms have attracted more and more attention. Therefore, after the 1970s, The research on the substitutes of various chrome tanning agents has always been the research topic of governments and scientific research institutes of various countries. At present, the commonly used ones that can partially replace chrome tanning agents are: [0003] 1. Ot...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information
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