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Preparation method of urea modified phosphonium salt tanning agent

A technology of phosphonium salt tanning agent and urea, which is applied in the field of preparation of urea-modified phosphonium salt tanning agent, can solve the problems of high cost and numerous processes, and achieve the effect of improving the stability of heat and humidity resistance

Inactive Publication Date: 2009-08-26
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the combination tanning method based on phosphonium salt can bring better results, but the process is complicated and the cost is high

Method used

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  • Preparation method of urea modified phosphonium salt tanning agent
  • Preparation method of urea modified phosphonium salt tanning agent
  • Preparation method of urea modified phosphonium salt tanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Tetrahydroxymethylphosphonium chloride P(CH with a mass concentration of 60% 2 Oh) 4 200Kg of Cl solution is added in a heat-resistant, pressure-resistant and corrosion-resistant reaction kettle equipped with a stirrer and a thermometer. Adjust pH = 6.5 with sodium hydroxide. Raise the temperature to 90°C, slowly add 40Kg of hydrogen peroxide, react for 4.0 hours, cool the initial product, adjust pH=6.5 with sodium hydroxide, and obtain a light yellow solution.

[0040] Add 60Kg of urea and 200Kg of deionized water into another reactor and mix them. Add 15Kg of formaldehyde, raise the temperature to 50°C and react for 3.0 hours, and adjust the pH to 6.0 with sodium bicarbonate. Add the above light yellow solution into the reactor, raise the temperature to 90°C, react for 6.0 hours, cool down to 40°C, slowly add 30Kg of hydrogen peroxide, and react for 2.0 hours to obtain a light yellow viscous liquid chrome-free main tanning agent for leather .

Embodiment 2

[0042] Tetrahydroxymethylphosphonium chloride P(CH with a mass concentration of 90% 2 Oh) 4160Kg of Cl solution is added in a heat-resistant, pressure-resistant and corrosion-resistant reaction kettle equipped with a stirrer and a thermometer. Adjust pH = 4.5 with sodium bicarbonate. Raise the temperature to 70°C, slowly add 25Kg of lithium peroxide, react for 2.0 hours, cool the initial product, and adjust the pH to 6.0 with sodium hydroxide to obtain a light yellow solution.

[0043] Add 30Kg of urea and 150Kg of deionized water into another reactor and mix them. Add 10Kg of acetaldehyde, raise the temperature to 40°C and react for 2.0 hours, and adjust the pH to 5.0 with sodium bicarbonate. Add the above light yellow solution into the reactor, raise the temperature to 60°C, react for 4.0 hours, cool down to 30°C, slowly add 20Kg of lithium peroxide, and react for 1.0 hour to obtain a light yellow viscous liquid chrome-free main tanning agent for leather .

Embodiment 3

[0045] Tetrahydroxymethylphosphonium bromide P(CH with a mass concentration of 75% 2 Oh) 4 180Kg of Br solution is added in a heat-resistant, pressure-resistant and corrosion-resistant reaction kettle equipped with a stirrer and a thermometer. Adjust pH = 5.5 with sodium hydroxide. Raise the temperature to 80°C, slowly add 33Kg of sodium peroxide, react for 3.0 hours, cool the initial product, and adjust the pH to 6.3 with sodium hydroxide to obtain a light yellow solution.

[0046] Add 45Kg of urea and 175Kg of deionized water into another reactor and mix them. Add 13Kg of glyoxal, raise the temperature to 45°C and react for 2.5 hours, and adjust the pH to 5.5 with ammonia water. Add the above light yellow solution into the reactor, raise the temperature to 75°C-80°C, react for 5.0 hours, cool down to 35°C, slowly add 25Kg of sodium peroxide, and react for 1.5 hours to obtain a light yellow viscous liquid leather without chromium Main tanning agent.

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Abstract

The invention discloses a method for preparing a urea-modified phosphonium salt tanning agent. The preparation of the tanning agent is characterized in that 160-200 parts by mass of a tetrahydroxymethyl phosphonium salt solution is added to a heat-resistant, pressure-resistant and corrosion-resistant tank equipped with a stirrer and a thermometer. in the reaction kettle. Raise the temperature to 70-90°C, adjust pH=4.5-6.5 with alkali, slowly add 25-40 parts by mass of peroxide, react for 2.0-4.0 hours, cool, adjust pH=6.0-6.5, and obtain a light yellow solution. Add 30-60 parts by mass of urea and 150-200 parts by mass of deionized water into another reactor and mix them. Add 10-15 parts by mass of the catalyst, raise the temperature to 40°C-50°C and react for 2.0-3.0 hours, and adjust the pH=5.0-6.0. Add the above-mentioned light yellow solution, heat up to 60-90°C, react for 4.0-6.0 hours, cool down to 30-40°C, slowly add 20-30 parts by mass of peroxide, and react for 1.0-2.0 hours to obtain a light yellow viscous Thick liquid chrome-free main tanning agent for leather.

Description

technical field [0001] The invention relates to a preparation method of a urea-modified phosphonium salt tanning agent, belonging to the field of chrome-free leather tanning agent synthesis. Background technique [0002] In my country's leather industry, 90% of tanning agents still use chrome tanning agents. A series of problems brought by chrome tanning agents to human health and the environment are increasingly recognized by people. Due to the low absorption and utilization rate of chrome tanning agent in the tanning process, the direct discharge of chrome tanning liquor has brought serious pollution of heavy metal salts to the environment. In addition, chrome tanned leather is not easy to degrade, hexavalent chromium is carcinogenic to humans, and a series of problems such as the very limited chromium resources in my country will inevitably limit the use and development of chrome tanning agents. Therefore, domestic and foreign tanning enterprises and scientific research...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08C14C3/18
Inventor 邵双喜史楷岐李亚蒋岚
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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