Aminated modified glycosyl aldehyde tanning agent and preparation method thereof
An aldehyde-based tanning agent and amination technology, which is applied in the fields of fur tanning and leather, can solve the problems of low concentration, low isoelectric point of tanned leather, inability to directly separate iodate, etc., so as to improve isoelectric point and aldehyde group content. High, good tanning effect
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Embodiment 1
[0021] In parts by weight, take 100 parts of sucrose, dissolve it in 500 parts of water, then add 150 parts of sodium periodate to avoid light and react for 12 h. After the reaction, adjust the pH to 6.0 with sodium hydroxide, stir, and filter to separate the iodate Precipitate, collect the filtrate to obtain sugar-based aldehyde tanning agent; get 100 parts of the above-mentioned sugar-based aldehyde tanning agent, heat up to 80 ºC, then add 10 parts of urea under stirring, add dropwise sodium hydroxide solution to control the pH of the reaction system to be 8.0, react After 4 h, the temperature was adjusted to 60 ºC, and the pH of the reaction system was adjusted to 4.0 with hydrochloric acid solution, and the reaction was continued for 2 h to obtain an amino-modified sugar-based aldehyde tanning agent. The aldehyde content of the tanning agent was 6.5 mmol / g. The tanning agent is used for pickling cowhide tanning, and the isoelectric point of the tanned leather is 5.4.
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Embodiment 2
[0029] In parts by weight, take 100 parts of sucrose, dissolve it in 100 parts of water, then add 180 parts of sodium periodate to avoid light and react for 8 hours. After the reaction, adjust the pH to 5.5 with sodium metasilicate, stir, and filter to separate iodic acid Salt precipitation, collecting the filtrate to obtain sugar-based aldehyde tanning agent; get 100 parts of the above-mentioned sugar-based aldehyde tanning agent, heat up to 60 ºC, then add 4 parts of melamine under stirring, add dropwise sodium hydroxide solution to control the pH of the reaction system to be 7.0, After reacting for 1 h, the temperature was adjusted to 50 ºC, and the pH of the reaction system was adjusted to 6.5 with hydrochloric acid solution, and the reaction was continued for 4 h to obtain an amino-modified sugar-based aldehyde tanning agent. The aldehyde content of the tanning agent was 8.8 mmol / g. The tanning agent is used for pickling cowhide tanning, and the isoelectric point of the t...
Embodiment 3
[0035] In parts by weight, take 100 parts of cellobiose, dissolve it in 200 parts of water, then add 250 parts of sodium periodate to avoid light and react for 24 hours. After the reaction, adjust the pH to 6.5 with sodium hydroxide, stir, and filter to separate the iodine Acetate precipitation, collect the filtrate to obtain sugar-based aldehyde tanning agent; take 100 parts of the above-mentioned sugar-based aldehyde tanning agent, heat up to 70 ºC, then add 8 parts of urea under stirring, add dropwise sodium hydroxide solution to control the pH of the reaction system to 9.0 , after reacting for 2 h, adjust the temperature to 80 ºC, and adjust the pH of the reaction system to 5.5 with hydrochloric acid solution, and continue the reaction for 1 h to obtain the amino-modified sugar-based aldehyde tanning agent. The aldehyde content of the tanning agent was 11.0 mmol / g. The tanning agent is used for pickling cowhide tanning, and the isoelectric point of the tanned leather is 5....
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