All-component wide-distribution organic polyaldehyde tanning agent and preparation method thereof

A technology with multiple aldehyde groups and wide distribution, which is applied in the field of preparation of leather and fur tanning agents, can solve the problems of narrow molecular weight distribution, poor tanning performance, and affecting the comprehensive performance of leather, and achieve wide molecular weight distribution, improved tanning degree, and good cross-fertilization The effect of co-tanning

Active Publication Date: 2017-09-29
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method of a polyaldehyde-based organic tanning agent with full components, wide distribution and no iodine, so as to overcome the existing aldehyde polysaccharide tanning agents or only retain part of the components, molecular weight distribution Too narrow, poor tanning performance, or containing iodine-containing compounds, which will affect the comprehensive performance of leather after tanning

Method used

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  • All-component wide-distribution organic polyaldehyde tanning agent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In parts by weight, 10 parts of sodium alginate and 10 parts of sodium periodate were added to 500 parts of water, the temperature of the system was controlled at 30°C, the pH was 9.5, and the aldehyde was stirred for 2 h in the dark to obtain a full-component, wide-distributed aldehyde Polysaccharide solution; add 12 parts of sodium bisulfite to the above solution, continue stirring and reacting for 10 min, reduce the iodine-containing compound to simple iodine, separate and recover solid iodine by filtration, heat-treat the filtrate at 100 °C for 1.5 h, and make the residual The iodine is evaporated in the form of vapor and absorbed and recovered with NaOH solution, and finally a polyaldehyde-based organic tanning agent with full components and wide distribution is obtained;

[0028] The weight-average molecular weight of the tanning agent is 18065 g / mol, the polydispersity coefficient is 15, and the aldehyde group content is 8.5 mmol / g;

[0029] In the drum, add 500%...

Embodiment 2

[0034] In parts by weight, 10 parts of taradin and 8 parts of sodium periodate were added to 200 parts of water, the temperature of the system was controlled at 20 ° C, the pH was 7.5, and the aldehyde was stirred for 4 h in the dark to obtain a full-component, wide-distributed aldehyde Polysaccharide solution; add 10 parts of sodium bisulfite to the above solution, continue stirring and reacting for 10 min, reduce the iodine-containing compound to simple iodine, separate and recover solid iodine by filtration, and heat-treat the filtrate at 95 °C for 1.5 h to make the residual The iodine is evaporated in the form of vapor and absorbed and recovered with NaOH solution, and finally a polyaldehyde-based organic tanning agent with full components and wide distribution is obtained;

[0035] The weight-average molecular weight of the tanning agent is 14870 g / mol, the polydispersity coefficient is 13, and the aldehyde group content is 8.0 mmol / g;

[0036] In the drum, add 500% water...

Embodiment 3

[0041] In parts by weight, 10 parts of sodium carboxymethylcellulose and 12 parts of sodium periodate were added to 400 parts of water, the temperature of the system was controlled at 10 °C, the pH was 9.5, and the mixture was stirred for 6 h in the dark to obtain the complete components, broad Aldehydated polysaccharide solution distributed; add 14 parts of sodium bisulfite to the above solution, continue stirring and reacting for 10 min, reduce the iodine-containing compound to simple iodine, separate and recover solid iodine by filtration, and heat-treat the filtrate at 100 °C for 2.0 h , the residual iodine is evaporated in the form of vapor and absorbed and recovered with NaOH solution, and finally a full-component, wide-distributed polyaldehyde-based organic tanning agent is obtained;

[0042] The weight-average molecular weight of the tanning agent is 4000 g / mol, the polydispersity coefficient is 18, and the aldehyde group content is 9.0 mmol / g;

[0043] Put the pickled...

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Abstract

The invention relates to an all-component wide-distribution organic polyaldehyde tanning agent and a preparation method thereof. The preparation method is characterized in that firstly, periodate is utilized to perform hydroformylation on polysaccharide and derivatives thereof under a proper condition, so as to retain all components of hydroformylated polysaccharide; secondly, an inorganic reducing agent is utilized to efficiently convert an iodine-containing compound into solid molecular iodine, and the solid molecular iodine is filtered and recycled; and finally, the hydroformylation product filtrate is subjected to heat treatment, so that the residual iodide is separated out in the form of steam, further absorbed by a NaOH solution and recycled, and the all-component wide-distribution organic polyaldehyde tanning agent is obtained. According to the all-component wide-distribution organic polyaldehyde tanning agent and the preparation method thereof, the technical problems that the conventional hydroformylated polysaccharide tanning agent is too narrow in molecular weight distribution and poor in tanning property, or contains the iodine-containing compound and affects the overall performance of leather after tanning are solved; besides, the prepared tanning agent retains all components of hydroformylated polysaccharide, the molecular weight distribution is wide, the shrinkage temperature of leather/fur after tannage can reach 85-90 DEG C, and the treated leather is pure white, full and soft.

Description

technical field [0001] The invention belongs to a preparation method of a leather and fur tanning agent, in particular to a full-component, wide-distribution polyaldehyde-based organic tanning agent and a preparation method thereof. Background technique [0002] Tanning is a vital step in leather and fur processing. The tanning agent forms new cross-linking bonds in the multi-level structure of collagen fibers, which increases the moisture and heat stability, strength and porosity of leather / fur, and reduces the bonding degree between collagen fibers, thus endowing leather / fur with excellent performance and sensory properties. At present, leather and most furs are mainly tanned by chrome tanning method, and the treatment of chromium-containing wastewater and chromium-containing solid waste is relatively difficult. With the increasingly stringent national environmental protection regulations, the use of chrome tanning has become a bottleneck restricting the development of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/08C14C1/08
CPCC14C1/08C14C3/08
Inventor 丁伟王亚楠石碧周建飞曾运航李靖
Owner SICHUAN UNIV
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