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Bicyclo oxazolidine tanning agent and method of preparing the same

A bicyclic oxazolidine tanning agent and a technology for the cyclooxazolidine tanning agent are applied in the field of bicyclic oxazolidine tanning agents and their preparation, which can solve the problems of environmental pollution, high cost and high selling price, and achieve strong operability, The effect of low production cost and avoiding environmental pollution

Inactive Publication Date: 2009-02-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bicyclic oxazolidine tanning agent used more expensive trihydroxyaminomethane (75,000 yuan / ton for domestic production and more than 100,000 yuan / ton for import) and 2-amino-2-ethyl-1,3-propanediol (Only imported, the price is about the same as trishydroxyaminomethane) as raw materials, in addition, benzene or acid anhydrides are often used as dehydrating agents in the production process, which not only leads to high product costs (the price is as high as 60-80 yuan / kg), and the dehydrating agent used It is a toxic substance and may also cause environmental pollution

Method used

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  • Bicyclo oxazolidine tanning agent and method of preparing the same
  • Bicyclo oxazolidine tanning agent and method of preparing the same
  • Bicyclo oxazolidine tanning agent and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First, add 65Kg of ethanolamine, 35Kg of formaldehyde, and 35Kg of ethylene glycol into a reaction kettle equipped with a stirrer, a thermometer and a reflux condenser, and react at 57±3°C for 3 hours, then add 58Kg of glyoxal, and place it at a temperature of 68± React at 3°C ​​for 5 hours, then vacuum dehydrate at 83±3°C for 2 hours, cool down to 43±3°C and discharge to obtain the product. The dehydration rate of the product is 93.5%, the hydrolyzed methylol content is 21.8%, and the aldehyde content is 21.1%.

Embodiment 2

[0032] First, add 115Kg of threonine, 25Kg of paraformaldehyde, and 75Kg of triethanolamine into a reaction kettle equipped with a stirrer, a thermometer and a reflux condenser, and react at 68±3°C for 3 hours, then add 45Kg of acetaldehyde, and React at 72±3°C for 4 hours, then vacuum dehydration at 97±3°C for 4 hours, cool down to 52±3°C and discharge to obtain the product. The product has a dehydration rate of 90%, and a hydrolyzed methylol content of 13.8%.

Embodiment 3

[0034] First, add 65Kg of ethanolamine, 105Kg of diethanolamine, and 90Kg of formaldehyde into a reaction kettle equipped with a stirrer, a thermometer and a reflux condenser, and react at 63±3°C for 4 hours, then vacuum dehydration at a temperature of 88±3°C for 3 hour, cooled to 48±3°C and discharged to obtain the product. The dehydration rate of this product is 90.6%, and the hydroxymethyl content after hydrolysis is 41.2%. Its infrared spectrogram is as shown in the accompanying drawing.

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Abstract

The present invention discloses a bicyclic oxazole alkane tanning agent. The agent is characterized by being prepared with hydroxymethyl amine, polyhydroxy alcohol and aliphatic aldehydes. The appearance of the agent is pale yellow dense liquid, the 1162cm<-1> and 1060cm<-1> of the infrared spectrogram have an O-C-N skeleton vibration absorbing peak, and the content of hydroxymethyl after hydrolysis is 10 to 45 percent. The present invention also discloses a preparation method of the bicyclic oxazole alkane tanning agent. In the preparation method, 60 to 120 portions of hydroxymethyl amine, 30 to 110 portions of polyhydroxy alcohol and 65 to 125 portions of aliphatic aldehydes are mixed for 4 to 9 hours for reaction at the temperature between 50 DEG C and 80 DEG C, the dehydration reaction is performed for 2 to 4 hours at the temperature between 80 DEG C and 100 DEG C, and the agent can be prepared after the temperature is lowered to be between 40 DEG C and 55 DEG C. The agent is cheap, the tanning effect is good, and no dehydrant is used in the preparation process. Therefore, the present invention has the advantages that the method is simple, the feasibility is high, the production cost is low, and the possible environmental pollution is prevented.

Description

technical field [0001] The invention belongs to the technical field of leather tanning agents and their preparation, and in particular relates to a bicyclic oxazolidine tanning agent and a preparation method thereof. Background technique [0002] The tanning technology revolution realized by the chrome tanning method that came out in the 19th century made the shrinkage temperature of chrome tanned leather reach above 100°C, and the comprehensive performance of the finished leather was better than other tanning methods. Therefore, for more than 100 years, chrome tanning has been the dominant tanning method in leather production (Luo Jianxun, Shan Zhihua. Research on chrome-free combined tanning. China Leather. 2006, 35:39-42.). However, with the strengthening of people's awareness of environmental protection and resources and the increasing emphasis on quality of life, chrome tanning is facing severe challenges. Therefore, the research and development of chrome-free tanning ...

Claims

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Application Information

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IPC IPC(8): C07D263/04C14C3/08
Inventor 石碧廖学品李靖曹明蓉
Owner SICHUAN UNIV
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