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High-combination leather fatting agent and preparing method thereof

A kind of leather fatliquor and combination technology, which is applied in the field of high combination leather fatliquor and its preparation, can solve the problems of restricting the wide use of products, high proportion of unreacted monomers, poor product performance, etc., and achieve the combination ability Strong, environmentally friendly and economical production process, overcome the effect of acid resistance

Inactive Publication Date: 2018-05-04
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are two main types of preparation routes for polymer fatliquoring agents: one is to use higher alcohol esters of acrylate or higher alcohol methacrylates as lipophilic monomers and hydrophilic monomers acrylic acid and methacrylic acid to prepare polymer fatliquor. Higher alcohol esters of acrylate and higher alcohol esters of methacrylate are hydrophobic monomers, organic solvents need to be used in the polymerization process, and the environmental protection is not strong in the process of synthesis and use
In addition, this type of lipophilic monomer needs to be prepared through a special process, and the price is relatively high, which limits the widespread use of this type of product
The other is to use hydrophilic monomer long-chain fatty alcohol maleic acid monoester and acrylic acid to carry out aqueous copolymerization. Because the long-chain fatty alcohol maleic acid monoester has low reactivity and high proportion of unreacted monomers, the performance of the obtained product is also low. poor

Method used

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  • High-combination leather fatting agent and preparing method thereof
  • High-combination leather fatting agent and preparing method thereof
  • High-combination leather fatting agent and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of a high-binding leather fatliquoring agent specifically comprises the following steps:

[0036] (1) Add 0.5 mol of dodecyl alcohol and 1 mol of maleic anhydride into the reactor, heat up to 90° C., perform esterification reaction for 2 hours, and obtain intermediate product A;

[0037] (2) The intermediate product A was cooled to 70°C, added 3.82g of azobisisobutyronitrile, and slowly added dropwise 0.5mol of vinyl acetate for 1.5-2.0h. After the dropwise addition, the temperature was raised to 80°C, and the reaction was kept for 2h. Obtain intermediate product B;

[0038] (3) Intermediate product B was heated to 100°C, 0.5 mol of dodecanol was added, and intermediate product C was obtained by reacting at 100°C for 2 hours.

[0039] (4) The intermediate product C was cooled to 65°C, and the pH was neutralized to 7.0 with 133g of a 30% aqueous sodium hydroxide solution, and then 173g of a 30% aqueous sodium bisulfite solution was added, and reacte...

Embodiment 2

[0041] A preparation method of a high-binding leather fatliquoring agent specifically comprises the following steps:

[0042] (1) Add 0.5 mol of cetyl alcohol and 1 mol of maleic anhydride into the reactor, raise the temperature to 90° C., perform esterification reaction for 2 hours, and obtain intermediate product A;

[0043] (2) The intermediate product A was cooled to 70°C, added 3.82g of azobisisobutyronitrile, and slowly added dropwise 0.5mol of vinyl acetate for 1.5-2.0h. After the dropwise addition, the temperature was raised to 80°C, and the reaction was kept for 2h. Obtain intermediate product B;

[0044] (3) Intermediate product B was heated to 100°C, 0.5 mol of cetyl alcohol was added, and reacted at 100°C for 2 hours to obtain intermediate product C.

[0045] (4) The intermediate product C was cooled to 65°C, and the pH was neutralized to 7.0 with 133g of a 30% aqueous sodium hydroxide solution, and then 173g of a 30% aqueous sodium bisulfite solution was added, a...

Embodiment 3

[0047] A preparation method of a high-binding leather fatliquoring agent specifically comprises the following steps:

[0048] (1) Add 0.5 mol of stearyl alcohol and 1 mol of maleic anhydride into the reactor, heat up to 90° C., perform esterification reaction for 2 hours, and obtain intermediate product A;

[0049] (2) The intermediate product A was cooled to 70°C, added 3.82g of azobisisobutyronitrile, and slowly added dropwise 0.5mol of vinyl acetate for 1.5-2.0h. After the dropwise addition, the temperature was raised to 80°C, and the reaction was kept for 2h. Obtain intermediate product B;

[0050] (3) Intermediate product B was heated to 100°C, 0.5 mol of octadecyl alcohol was added, and reacted at 100°C for 2 hours to obtain intermediate product C.

[0051] (4) The intermediate product C was cooled to 65°C, and the pH was neutralized to 7.0 with 133g of a 30% aqueous sodium hydroxide solution, and then 173g of a 30% aqueous sodium bisulfite solution was added, and react...

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Abstract

The invention discloses a high-combination leather fatting agent and a preparing method thereof. The preparing method comprises the following steps that (1) a certain amount of long-chain fatty alcohol and maleic anhydride are added into a reactor, the temperature is raised to 80 DEG C-90 DEG C for esterification reaction, and a product A is obtained; (2) the product A is cooled to 70 DEG C-75 DEGC, a certain quantity of initiator, namely azodiisobutyronitrile is added, a certain amount of monomer acetic acid vinyl ester is dropped in for a polymerization reaction, and a product B is obtained; (3) the product B is heated to 100 DEG C-110 DEG C, a certain amount of long-chain fatty alcohol is added for an esterification reaction, and a product C is obtained; and (4) the product C is cooledto 65 DEG C-70 DEG C, a sodium hydroxide solution with the mass concentration being 30% is used for neutralizing the pH of a reactant to 7.0, then a certain quantity of sulfite aqueous solution is added, a sulfitation reaction is carried out at 80 DEG C-90 DEG C, and the high-combination leather fatting agent is obtained after cooling. The high-combination leather fatting agent and the preparingmethod have the beneficial effects that the process is simple, clean and environment-friendly, the produced product is excellent in acid-resisting stability, fat liquoring effect, filling performance,solvent extraction performance and the like, and the effluent COD content can be reduced.

Description

technical field [0001] The invention relates to a preparation method of a leather fatliquor, in particular to a high-binding leather fatliquor and a preparation method thereof. Background technique [0002] Fatliquor is one of the most used chemicals in the tanning process. The traditional fatliquor is mainly a small molecule fatliquor, which is a modified product of natural animal and vegetable oils. Its function is to lubricate the leather fibers and give the leather a soft and comfortable feel. Small molecule fatliquor has a weak binding ability to leather fibers, and it is easy to migrate during leather storage and use, reducing the softness of the leather, making the leather hard and the fibers brittle. Applications in are restricted. Compared with small molecule fatliquor, polymer fatliquor has large molecular weight, more polar groups on the molecule, and strong binding ability with leather fibers, so it has been applied in high-grade leather such as automobile seat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C9/02C08F222/06C08F218/08C08F8/14C07C303/32C07C309/17
CPCC07C67/08C07C303/32C08F8/14C08F218/08C08F222/06C14C9/02C07C309/17C07C69/60
Inventor 邹祥龙任便利许晓红柴玉叶兰云军
Owner WENZHOU UNIVERSITY
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