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Preparation of acrylic polymer retanning agent for highly elastic leather retanning

An acrylic, retanning agent technology, applied in small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, application, etc., can solve the problem of lower output value, high price and disadvantage Large-scale promotion and use, etc., to achieve the effect of high added value, good flexibility, and high cost performance

Inactive Publication Date: 2008-12-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are relatively few products that significantly improve the elasticity of leather, and they are very astringent. After retanning, the leather area shrinks significantly. Since light leather is measured by area, the reduction in area directly leads to a decrease in output value; Imported from abroad, the price is relatively high, which is not conducive to large-scale promotion and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: First, take 25 parts of deionized water and 60 parts of isopropanol according to mass parts and add them to a three-necked flask, and place them in a water bath to heat and stir to obtain a mixed solution of isopropanol and water; then take mass parts 16.8 parts of acrylic acid (AA), 3.8 parts of butyl acrylate (BA), 3.7 parts of ethyl acrylate (EA), 1.7 parts of hydroxyethyl acrylate (HEA), 4.0 parts of acrylamide (AM) are mixed uniformly into the constant pressure dropping funnel Obtain mixed monomers; dissolve 3 parts of ammonium persulfate in 20 parts of deionized water according to the mass parts, add another constant pressure dropping funnel to obtain an aqueous solution of ammonium persulfate; heat up the water bath to 75 ℃ of isopropanol and water mixed solution Add mixed monomer and ammonium persulfate aqueous solution dropwise at the same time in 1.5h. After the dropwise addition is completed within 1.5h, the temperature is raised to 80℃ and the reactio...

Embodiment 2

[0012] Example 2: First, take 33.7 parts of deionized water and 45 parts of isopropanol according to mass parts and add them to a three-necked flask, and place them in a water bath with heating and stirring to obtain a mixed solution of isopropanol and water; then take 18.3 parts by mass Parts of acrylic acid (AA), 2.8 parts of butyl acrylate (BA), 3.7 parts of ethyl acrylate (EA), 2.1 parts of hydroxyethyl acrylate (HEA), 3.1 parts of acrylamide (AM) are mixed uniformly and added to the constant pressure dropping funnel. Mixed monomers; dissolve 3 parts of ammonium persulfate in 22 parts of deionized water according to mass parts, add another constant pressure dropping funnel to obtain an aqueous solution of ammonium persulfate; heat up the water bath to 75 ℃ of isopropanol and water mixed solution Add mixed monomers and ammonium persulfate aqueous solution dropwise at the same time, add dropwise within 1.2h, warm up to 85℃ and keep for 2h; after the reaction, cool to room temper...

Embodiment 3

[0013] Example 3: First, take 40 parts of deionized water and 70 parts of isopropanol according to mass parts and add them to a three-necked flask, and place them in a water bath with heating and stirring to prepare a mixed solution of isopropanol and water; then take mass parts 18.6 parts of acrylic acid (AA), 3.8 parts of butyl acrylate (BA), 3.8 parts of ethyl acrylate (EA), 1.7 parts of hydroxyethyl acrylate (HEA), 2.1 parts of acrylamide (AM) mixed uniformly into the constant pressure dropping funnel Obtain mixed monomers; Dissolve 1.5 parts of ammonium persulfate in 30 parts of deionized water according to mass parts, add another constant pressure dropping funnel to obtain an aqueous solution of ammonium persulfate; Heat up the isopropanol and water mixed solution of the water bath to 80℃ Add mixed monomers and ammonium persulfate aqueous solution dropwise at the same time in 1.0h. After the dripping is completed within 1.0h, the temperature is raised to 82℃ and the reaction...

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Abstract

The invention relates to a preparation method of an acrylic polymer retanning agent for retanning of high elastic leather. Deionized water and isopropanol are added into a three-neck flask which is placed into a water bath for heating and stirring. Mixed acrylic monomers are added into a dropping funnel of constant pressure, ammonium persulphate is dissolved into the deionized water and added into another dropping funnel of constant pressure and after water temperature is raised to 70 DEG C to 80 DEG C, the mixed monomers and an initiator are started dripping simultaneously and controlled to be finished dripping in 60 min to 90 min and the temperature is raised to 80 DEG C to 85 DEG C, which is kept so as to take a reaction. After the reaction, a room temperature is cooled to, systematic pH is adjusted to 4.5 to 6.0, and solvent is distilled off the system completely, and finally discharging is carried out. The acrylic polymer retanning agent of the invention has advantages of easy getting of raw materials, relatively simple experimental operation, the retanning agent prepared with a plurality of different side chain base groups, thus improving elasticity of the leather significantly, increasing value-added content of leather products and reducing dosage of chrome tanning agent and providing with great economic benefit and environmental benefit.

Description

Technical field [0001] The invention relates to a method for preparing a retanning agent for leather making, in particular to a method for preparing an acrylic polymer retanning agent for high elastic leather retanning. Background technique [0002] Retanning occupies a pivotal position in the tanning process, which directly determines the performance of the finished leather, and is hailed as the "Alchemy" by the leather industry. The carboxyl group on the side chain of the acrylic polymer retanning agent can chemically combine with various groups on the skin collagen peptide chain and the chromium salt in the chrome tanned leather, and it has a selective filling effect, which increases the leather. The thickening effect is remarkable. The retanned leather is resistant to light and aging, and has excellent velvet characteristics. In addition, due to the linear structure of the acrylic polymer retanning agent, it can better penetrate into the leather, so the acrylic polymer retann...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/22C08F220/06
Inventor 马建中路华胡静吕斌鲍艳朱华王鑫鑫
Owner SHAANXI UNIV OF SCI & TECH
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