A kind of high combination leather fatliquoring agent and preparation method thereof

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

Inactive Publication Date: 2020-04-10
WENZHOU UNIV
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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
Another kind is to use hydrophilic monomer long-chain fatty alcohol maleic acid monoester and acrylic acid to carry out aqueous solution copolymerization, because long-chain fatty alcohol maleic acid monoester reactivity is low, the proportion of unreacted monomer is high, the obtained product performance is also poor. poor

Method used

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  • A kind of high combination leather fatliquoring agent and preparation method thereof
  • A kind of high combination leather fatliquoring agent and preparation method thereof
  • A kind of high combination leather fatliquoring agent and preparation 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 dodecanol and 1 mol of maleic anhydride into the reactor, raise the temperature to 90°C, and perform esterification reaction for 2 hours to obtain the intermediate product A;

[0037] (2) Cool the intermediate product A to 70°C, add 3.82g of azobisisobutyronitrile, slowly add 0.5mol of vinyl acetate dropwise, the dropwise addition time is 1.5~2.0h, after the dropwise addition, raise the temperature to 80°C, and keep the temperature for 2h Obtain intermediate product B;

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

[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,...

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, and perform esterification reaction for 2 hours to obtain the intermediate product A;

[0043] (2) Cool the intermediate product A to 70°C, add 3.82g of azobisisobutyronitrile, slowly add 0.5mol of vinyl acetate dropwise, the dropwise addition time is 1.5~2.0h, after the dropwise addition, raise the temperature to 80°C, and keep the temperature 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 wa...

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, raise the temperature to 90°C, and perform esterification reaction for 2 hours to obtain the intermediate product A;

[0049] (2) Cool the intermediate product A to 70°C, add 3.82g of azobisisobutyronitrile, slowly add 0.5mol of vinyl acetate dropwise, the dropwise addition time is 1.5~2.0h, after the dropwise addition, raise the temperature to 80°C, and keep the temperature for 2h Obtain intermediate product B;

[0050] (3) Intermediate product B was heated to 100°C, 0.5 mol of stearyl 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 solutio...

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Abstract

The invention discloses a high-combination leather fatliquoring agent and a preparation method thereof, comprising the following steps: (1) adding a certain amount of long-chain fatty alcohol and maleic anhydride into a reactor, raising the temperature to 80-90°C for esterification , to obtain product A; (2) cooling product A to 70-75° C., adding a certain amount of initiator azobisisobutyronitrile, and then dropwise adding a certain amount of monomer vinyl acetate to carry out polymerization reaction to obtain product B; (3 ) raising the temperature of product B to 100-110°C, adding a certain amount of long-chain fatty alcohol for esterification reaction to obtain product C; (4) cooling product C to 65-70°C, using 30% sodium hydroxide The aqueous solution neutralizes the pH of the reactant to 7.0, then adds a certain amount of sulfite aqueous solution, and carries out sulfitation reaction at 80-90°C, and after cooling down, a high-binding leather fatliquoring agent is obtained. The invention has the advantages of simple process, clean and environment-friendly, and the prepared product has excellent properties such as acid resistance stability, fatliquoring effect, filling performance and solvent extraction resistance, and can reduce the COD content of waste liquid.

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 Patents(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 UNIV
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