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Preparation method and application of polyethylene glycol s-triazine derivative leather tanning agent

A technology of polyethylene glycol and s-triazine, which is applied in the field of preparation of polyethylene glycol-s-triazine derivative tanning agents, can solve the problem of low reaction efficiency of terminal aldehyde products, lack of rigidity of chain structure, and poor crosslinking stability and other problems, to achieve the effect of plump hand feeling, obvious thickening and short production cycle

Active Publication Date: 2021-09-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research on its use as a tanning agent still has the following problems: 1) The terminal aldehyde product obtained by direct oxidation has low reaction efficiency and high cost; 2) The simple chain structure lacks rigidity, resulting in poor crosslinking stability[Zhou, Yongxiang, Ma, Jianzhong, et al. Modification of collagen with three novel tannages, sulfonated calix[4]arenes[J]. International Journal of Biological Macromolecules. 2018.04:169-173.]
However, as a special collagen modification method, tanning needs to introduce a large number of stable cross-links between skin collagens, and needs to react in a relatively mild aqueous phase, which is not possible for current polyethylene glycol derivatives. achieved

Method used

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  • Preparation method and application of polyethylene glycol s-triazine derivative leather tanning agent
  • Preparation method and application of polyethylene glycol s-triazine derivative leather tanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 200ml of acetone to a three-necked flask with a tetrafluoro stirring rod, weigh 23.9g of cyanuric chloride and add it to the three-necked flask, stir and dissolve in a cold water bath (0~5℃), while stirring and add dried anhydrous sodium carbonate 8.8 g, weigh 14.1g of dried polyethylene glycol 200 and add it to a constant pressure separatory funnel, adjust the dripping speed and add it dropwise to the stirring reaction solution in 30min, pour out the reaction mother solution after 7.5h of reaction, and filter the filtrate in a vacuum The solvent was concentrated on a rotary evaporator with a temperature of 0.08 MPa and a temperature of 20° C. to remove the solvent, an appropriate amount of water was added to dissolve, and the pH value was adjusted to 5-7 with an alkali to obtain a polyethylene glycol s-triazine derivative tanning agent.

Embodiment 2

[0024] Add 200ml of acetone to a three-necked flask with a tetrafluoro stirring rod, weigh 23.9g of cyanuric chloride into the three-necked flask, stir and dissolve in a cold water bath (0~5℃), and then add dried anhydrous 8.8g of sodium carbonate, weigh 42.1g of dried polyethylene glycol 600, add it to a constant pressure separatory funnel, adjust the dropping rate at 30min and add it dropwise to the stirring reaction solution, introduce nitrogen protection, and pour out after 8.5h of reaction The reaction mother liquor was filtered, the filtrate was concentrated on a rotary evaporator with a vacuum degree of 0.08 MPa and a temperature of 20 ° C to remove the solvent, an appropriate amount of water was added to dissolve, and the pH value was adjusted to 5-7 with an alkali to obtain polyethylene glycol s-triazine derivative tanning agent.

Embodiment 3

[0026] Add 250ml of toluene into a three-necked flask with a tetrafluoro stirring rod, weigh 23.9g of cyanuric chloride and add it to the three-necked flask, stir and dissolve in a cold water bath (0~5℃), and then add dried hydroxide Sodium 6.1g, weigh 56.2g of dried polyethylene glycol 800, add it to a constant pressure separatory funnel, adjust the dropping rate and add it dropwise to the stirring reaction solution in 30min, introduce nitrogen protection, react for 8.5h and pour out the reaction solution The mother liquor is filtered, the filtrate is concentrated on a rotary evaporator with a vacuum degree of 0.08 MPa and a temperature of 20 ° C to remove the solvent, an appropriate amount of water is added to dissolve, and the pH value is adjusted to 5-7 with an alkali to obtain a polyethylene glycol s-triazine derivative tanning agent .

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Abstract

The invention discloses a preparation method and application of a polyethylene glycol s-triazine derivative leather tanning agent. According to the method, polyethylene glycol and a s-triazine compound react in an aprotic solvent, and the polyethylene glycol s-triazine leather tanning agent is obtained. The polyethylene glycol main chain in the structure of the tanning agent can provide good water solubility and adjustable molecular size for the tanning agent, the chlorohomoazine structure not only can provide a plurality of active sites reacting with collagen, but also has certain rigidity, and can form stable crosslinking among collagen fibers, so that the tanning agent has better tanning property. The preparation method of the tanning agent is simple, when the tanning agent is independently used for tanning, the shrinkage temperature of tanned leather reaches 78-84 DEG C, and the finished leather is white in color and has good softness and fullness. In the tanning process, chromium and aldehyde are not needed, neutral salt does not need to be added, and the method is a clean leather tanning method.

Description

technical field [0001] The invention relates to the technical field of leather clean production, in particular to a preparation method and application of a polyethylene glycol s-triazine derivative tanning agent. Background technique [0002] The traditional tanning method is to use chrome to tan raw hides. Among many metal tanning agents, chrome has the most excellent tanning performance, but this method requires a large amount of chrome, and the resources of chrome on the earth are very limited, and The utilization rate of chromium in the tanning process is only about 70%. The direct discharge of unused chromium will put pressure on the environment and cause damage to vegetation, and the terminal treatment of chromium waste liquid is difficult and costly. Although many studies have been carried out to improve the absorption of chromium by the skin, thereby increasing the utilization rate of chromium, these methods require high costs and are difficult to industrialize. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/22C14C3/28
CPCC14C3/22C14C3/28
Inventor 彭必雨贾欣驹张春晓
Owner SICHUAN UNIV
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