Preparation method of acrylic acid retanning agents

An acrylic retanning agent and acrylic acid technology, which can be used in animal husbandry, small raw hide/large raw hide/leather skin/fur chemical treatment, application, etc., can solve problems such as fast speed, wide molecular weight distribution, and excessive molecular weight, and achieve good results Effect of permeability and filling, reduction of poor leather parts, and narrow molecular weight distribution

Active Publication Date: 2010-10-06
QI HE LI HOU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Acrylic retanning agent is mostly carried out by the method of solution polymerization in water medium, the reaction temperature is 70-80 ℃, the molecular weight distribution is wide, and the molecular weight is too large, which is n

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Example 1

[0015] Add 1580kg of acrylic acid to head tank 1; add 153kg of chain transfer agent to head tank 2; add 180kg of initiator solution to head tank 3, which contains 17kg of initiator; add 80kg of 50% oxidant to head tank 4 Solution; add 20kg regulator solution in the head tank 5, which contains regulator 1.83kg. Add 600kg of water to the reactor, and add 20kg of pH buffer solution. Then heat the temperature of the material in the kettle to 98°C, and turn on the circulating water of the condenser at the same time, start to add: acrylic acid, chain transfer agent, and initiator at the same time, and the feeding time is 5 hours, during which the temperature is controlled at 98-100°C. After the feeding is finished, cool the material in the kettle to 83°C, add the regulator solution, and continue the reaction at 80-85°C for 1.5 hours. Then, 690kg of 30% sodium hydroxide solution and 250kg of water were added at the same time, and the pH value was adjusted to 4.22...

Example Embodiment

[0016] Example 2

[0017] Add 1530kg acrylic acid in head tank 1; Add 150kg chain transfer agent in head tank 2; Add 180kg initiator solution in head tank 3, wherein contain initiator 16.3kg; Add 74kg content in head tank 4 and be 50% Oxidant solution; Add 20kg regulator solution in the head tank 5, which contains regulator 1.85kg. Add 600kg of water to the reactor, and add 17.8kg of pH buffer solution. Then heat the temperature of the material in the kettle to 99°C, and turn on the circulating water of the condenser at the same time, start to add: acrylic acid, chain transfer agent, initiator at the same time, the feeding time is 4 hours, during which the temperature is controlled at 98-102°C. After the feeding is finished, cool the material in the kettle to 80°C, add the regulator solution, and continue the reaction at 80-85°C for 2 hours. Then, 693kg of 30% sodium hydroxide solution was added, and 250kg of water was added at the same time, and the pH value was adjusted to...

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PUM

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Abstract

The invention provides a preparation method of acrylic acid retanning agents, which comprises the following steps: adding 1500 to 1620 kg of acrylic acid into an overhead tank 1; carrying out polyreaction; adding 150 to 160 kg of chain transfer agents into an overhead tank 2; adding 180 kg of triggering agent solution containing 16 to 20 kg of triggering agents into an overhead tank 3; adding 60 to 80 kg of oxidizing agent solution with the content of 50 percent into an overhead tank 4; adding 20 kg of regulating agent solution containing 1.8 to 1.9 kg of regulating agents into an overhead tank 5; adding 500 to 600 kg of water into a reaction kettle; adding 16 to 20 kg of pH buffer solution; then, heating materials in the reaction kettle to a temperature between 98 and 102 DEG C; simultaneously opening condenser circulation water; at the time, simultaneously beginning to add the acrylic acid, the chain transfer agents and the triggering agents with the material adding time between 4 and 5 hours; controlling the temperature between 98 and 102 DEG C in the period; cooling the materials in the reaction kettle to 80 to 85 DEG C after the material addition is completed; adding the regulating agent solution; continuously carrying out reaction for 1 to 2 hours at 80 to 85 DEG C; then, adding 690 to 700 kg of 30 percent sodium hydroxide solution and simultaneously adding 250 kg of water; regulating the pH value to 4 to 4.5 for continuous reaction for 30 min; raising the temperature in the reaction kettle to 100 DEG C; adding the oxidizing agent solution in 1 to 1.5 hours; preserving the temperature for 2 to 4 hours at 100 DEG C after the addition; lowering down the temperature to 55 to 60 DEG C; adding 1800 to 2000 kg of water to regulate the content to the specified content; and carrying out mixing for 30 min at 55 to 60 DEG C.

Description

technical field [0001] The present invention relates to a kind of preparation method of retanning agent for tanning, more specifically, what the present invention relates to is the preparation method of a kind of acrylic acid retanning agent for tanning. Background technique [0002] Retanning is an important and indispensable process in the process of leather making, known as the "golden touch" of leather making. Retanning can improve the fullness and firmness of the leather, reduce the difference in parts, etc., and is also conducive to the operation of the subsequent finishing process. Acrylic polymer retanning agent has good water dispersion and good binding ability with leather, strong filling effect, obvious thickening effect on leather, and can also endow leather with good softness, fullness and elasticity. At the same time, the carboxyl group in the acrylic retanning agent has a strong complexing ability with chromium, so it can promote the absorption of chromium an...

Claims

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Application Information

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IPC IPC(8): C08F120/06C08F2/38C08F4/40C14C3/22
Inventor 冯练享白清泉
Owner QI HE LI HOU CHEM CO LTD
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