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Retanning agent for improving tearing strength of leather and preparation method of retanning agent

A technology of tear resistance and retanning agent, which is applied in small raw hide/big raw hide/leather/fur treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, animal husbandry, etc. Problems such as protein interaction, inability to obtain products with stable performance, short alkyl chain length, etc., to achieve the effect of superior performance, soft film formation and high tear strength

Inactive Publication Date: 2018-06-29
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regarding the synthesis of organic carbon quaternary ammonium salt cationic proteins, from the reported synthetic methods, there are mainly grafting reactions of unsaturated quaternary ammonium salts and the reaction of cationic monomers directly with amino groups in proteins to obtain corresponding cationic protein products. However, the structure of these products is not clear, and the performance of the product in some aspects is only explained through application. If industrial production is carried out, it is difficult to carry out a controllable quantitative reaction, and it is impossible to obtain a product with stable performance.
At present, it has been reported that the conversion rate of quaternary ammonium salts has been grafted onto collagen polypeptide molecules by using the primary amino group determination technology. However, due to the molecular structure of quaternary ammonium salts, the reaction efficiency with primary amino groups on gelatin molecules is limited. Moreover, the length of the alkyl chain is short and the degree of quaternization is low, so it is difficult to fully exert the effect of cationic protein

Method used

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  • Retanning agent for improving tearing strength of leather and preparation method of retanning agent
  • Retanning agent for improving tearing strength of leather and preparation method of retanning agent
  • Retanning agent for improving tearing strength of leather and preparation method of retanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 0.178g of potassium sulfate, 9.45g of 3-chloro-1,2-epoxychloropropane, 17ml of methanol, and distilled water into a 250ml three-neck reaction flask equipped with a thermometer socket, a dropping funnel socket, and a condenser socket, and stir with a magnetic force. After stirring and heating to 50°C, open the dropping funnel and continue to add 7.3g of dimethylethylamine dropwise for 30 minutes. After the dropwise addition, keep stirring and heating at a constant temperature of 50°C for 1.5h. The resulting product is poured into a 250ml round-bottomed flask equipped with a distillation head, a thermometer socket, and a condenser socket, and ethylene monochloride (6.45g) is added to react to prepare 2,3-epoxypropylethylmethyl ethylamine chloride , assemble the apparatus and carry out vacuum distillation. Finally, it is purified by Soxhlet extractor to obtain quaternary ammonium salt.

[0043] Take 10g of gelatin and 190g of distilled water into a 250ml round bottom ...

Embodiment 2

[0049] The described method is consistent with that of Example 1, the only difference is that the ratio between the epoxy group and the primary amino group is changed to a material ratio of 0.5:1.

[0050] Add ethanol to the obtained feed solution and mix evenly. The volume ratio of ethanol to the mixed solution is 1:4. Place it in a normal pressure oven at 50°C and dry for 6 hours to obtain a gelatin film with a contact angle of 97°. The gelatin film is hydrophobic. .

Embodiment 3

[0052] The described method is consistent with that of Example 1, the only difference is that the ratio between the epoxy group and the primary amino group is changed to a material ratio of 1:1.

[0053] Add ethanol to the obtained feed solution and mix evenly. The volume ratio of ethanol to the mixed solution is 1:4. Place it in a normal pressure oven at 50°C and dry for 6 hours to obtain a gelatin film with a contact angle of 103.02°. The gelatin film is hydrophobic. , and the hydrophobicity is improved.

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Abstract

The invention relates to a retanning agent for improving tearing strength of leather and a preparation method of the retanning agent. The retanning agent is prepared from 2,3-glycidyl ethyl methyl ethylamine chloride grafted gelatin polymer; preparation raw materials of the polymer comprise 2,3-glycidyl ethyl methyl ethylamine chloride and gelatin; for the polymer obtained by addition reaction ofepoxy group of the 2,3-glycidyl ethyl methyl ethylamine chloride and hydrogen atoms of primary amine on gelatin molecules, the breaking elongation is 19mm and the strength is 0.25 to 0.40MPa; the glass transition temperature is 190 to 218 DEG C, the antibacterial rate is 40 to 90 percent, the adsorption dye rate is 60 to 78 percent and the thickening rate is 110 to180 percent. The retanning agentcan significantly improve the tearing strength of the leather, and has the advantages of antibacterial property, adsorption and fixing of dye, bright coating colors and the like.

Description

technical field [0001] The invention belongs to the technical field of retanning agent preparation, and in particular relates to a retanning agent which significantly improves the tear resistance strength of leather and a preparation method thereof. Background technique [0002] Among many antibacterial materials such as inorganic salts, organic metals, and heterocyclic compounds with anions, quaternary ammonium compounds are widely recognized for their non-toxicity and strong antibacterial efficiency. Epoxy compounds are often used to modify collagen due to their high ring tension and strain energy. This project will synthesize quaternary ammonium salt-type epoxy compounds, and use the ring-opening reaction of primary amino groups and epoxy groups under alkaline conditions to introduce quaternary ammonium salts into protein molecules to prepare cationic proteins. Cationic proteins can be used as leather retanning agents to improve the antibacterial and filling properties o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H1/00C14C3/22
CPCC08H1/00C14C3/22
Inventor 许静徐士林高春红庞依依李天铎
Owner QILU UNIV OF TECH
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