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Method for preparing leather retanning fat-liquoring agent

A retanning, fatliquoring and leather technology, which can be used in small hide/big hide/leather/fur treatment, small hide/big hide/leather skin/fur chemical treatment, tanning treatment, etc. It can solve the lubrication effect of retanning agent Poor quality, leather hardening, brittleness and other problems, to achieve the effect of lasting softness, reducing dosage, and excellent waterproof performance

Inactive Publication Date: 2009-06-17
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional resins obtained by free radical copolymerization of unsaturated acids have a good retanning filling and thickening effect, such as polyacrylic acid, but these retanning agents have poor lubricating effects, and adding too much will make the leather hard and brittle, so the system The resin obtained by free radical copolymerization of unsaturated acid has no fatliquoring effect, so it does not belong to retanning fatliquoring agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] (1), the preparation of dodecyl alcohol n-butanol maleic acid diester

[0018] Add 93 parts of dodecyl alcohol and 102.9 parts of maleic anhydride into the reactor, raise the temperature to 90°C, keep the temperature for 2.5 hours, then cool down to 80°C, install an oil-water separator device on the same device, and add n-butanol 54 to the reaction kettle 1.25 parts of p-toluenesulfonic acid, then heated up to 130°C, kept the temperature for 1.5h to 2.5h, observed the reflux of n-butanol, noted the volume of water evaporated in the water separator, measured the acid value of the reactant, and calculated twelve The double esterification rate of alcohol maleic acid monoester, when the conversion rate of dodecyl alcohol maleic acid monoester is greater than 98%, it is regarded as the end of the reaction, and the unreacted n-butanol is distilled under reduced pressure to obtain dodecyl alcohol n-butanol. Butyl alcohol diester maleate.

Embodiment 1

[0020] Add 67.6 parts of dodecanol n-butanol diester maleate, 1.33 parts of ammonium persulfate, 10 parts of T-80 and 50 parts of water into the reactor, raise the temperature to 85°C, and add the mixture of methacrylic acid and vinyl acetate dropwise at a uniform speed. Liquid (obtained by mixing 34.4 parts of methacrylic acid and 4.3 parts of vinyl acetate) and ammonium persulfate aqueous solution (4 parts of ammonium persulfate dissolved in 40 parts of water), the dropping time is controlled at 2.5h ~ 3h. After the dropwise addition, keep the reaction at 85°C for 2 hours, then lower the temperature to 55°C, slowly add 53.3 parts of sodium hydroxide aqueous solution with a mass fraction of 30%, control the internal temperature not higher than 65°C, and adjust the pH of the reaction system at 6.5-7.5 . After the sodium hydroxide solution was added dropwise, 36.6 parts of water was added, the temperature was lowered to 50° C., and the material was discharged to obtain a polyme...

Embodiment 2

[0022] Add 67.6 parts of dodecyl alcohol n-butanol diester maleate, 1.33 parts of ammonium persulfate, 10 parts of T-80 and 50 parts of water into the reactor, raise the temperature to 85°C, and dropwise add a mixture of acrylic acid and vinyl acetate ( Mix 28.8 parts of methacrylic acid and 4.3 parts of vinyl acetate) and ammonium persulfate aqueous solution (3.5 parts of ammonium persulfate dissolved in 40 parts of water), and the dropping time is controlled at 2.5h to 3h. After the dropwise addition, keep the reaction at 85°C for 2 hours, then lower the temperature to 55°C, slowly add 53.3 parts of sodium hydroxide aqueous solution with a mass fraction of 30%, control the internal temperature not higher than 65°C, and adjust the pH of the reaction system at 6.5-7.5 . After the sodium hydroxide solution was added dropwise, 28.2 parts of water was added, the temperature was lowered to 50° C., and the material was discharged to obtain a polymer retanning and fatliquoring agent...

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Abstract

The invention discloses a method for preparing a leather retanning fat-liquoring agent which is a long chain aliphatic alcohol n-butyl alcohol maleic diester methacrylate polymer prepared by a water emulsion copolymerized reaction of a long chain aliphatic alcohol n-butyl alcohol maleic diester and a methacrylic acid. The leather retanning fat-liquoring agent of the invention is a high molecule material with an amphipathic structure, is suitable for the leather processing, has multifunction of retanning, fat-liquoring, water proof and wash resistance or the like, reduces the leather chemical material amount and the tanning process and is useful for implementing leather cleaning production.

Description

technical field [0001] The invention belongs to the technical field of leather chemical industry, in particular to a leather retanning and fatliquoring agent containing long-chain fatty alcohol n-butanol maleic acid diester polymer and a preparation method thereof. Background technique [0002] Retanning and fatliquoring are two important steps in the leather making process. Retanning is called "golden touch" in the modern leather industry, which shows its important role. For light leather, retanning is almost essential Less process. Fatliquoring is an important link in tanning production. Fatliquoring materials are introduced into the leather through fatliquoring to lubricate the leather fibers, making the leather soft, plump, tough, and resistant to folding, and endowing the leather with good Hydrophobicity improves the physical-mechanical properties and wearability of leather. The development of a leather chemical product (retanning and fatliquoring agent) with retannin...

Claims

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Application Information

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IPC IPC(8): C14C3/22
Inventor 邹祥龙兰云军银德海柴玉叶周建飞
Owner WENZHOU UNIVERSITY
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