Terminal aldehyde hyper branched polymer leather retanning agent and preparation method thereof

A technology of hyperbranched polymer and hydroxyl-terminated hyperbranching, which can be used in small raw hides/large raw hides/leather/fur treatment, small raw hides/large raw hides/leather hides/fur chemical treatment, tanning treatment, etc. Large, low reactivity, insignificant effects, etc., to achieve the effect of small usage, high reactivity, and improved tear strength

Inactive Publication Date: 2008-07-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides an aldehyde-terminated hyperbranched polymer leather retanning agent and a preparation method thereof, so as to overcome the disadvantages of low reactivity, large usage amount and insignificant effect in the prior art

Method used

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  • Terminal aldehyde hyper branched polymer leather retanning agent and preparation method thereof
  • Terminal aldehyde hyper branched polymer leather retanning agent and preparation method thereof
  • Terminal aldehyde hyper branched polymer leather retanning agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Firstly, methyl acrylate and diethanolamine were mixed at a molar ratio of 1:1.3, 20 mL of anhydrous methanol was added as a solvent, and after stirring and reacting at 35°C for 7 hours, the solvent was removed under reduced pressure, and p-toluenesulfonate with a mass percentage of 4% was added Carry out acidic catalysis with acid, vacuumize (vacuum degree is 0.05MPa) and react at 120°C for 3h to obtain hydroxyl-terminated hyperbranched polyurethane-ester; ) were mixed at a molar ratio of 2:1, 2% concentrated sulfuric acid was added, 35ml cyclohexane was added, and the mixture was stirred and reacted at 100°C for 3h.

[0010] The reaction scheme is as follows:

[0011] (1) Synthesis of methyl acrylate and diethanolamine

[0012]

[0013] (2) Synthesis of hydroxyl-terminated hyperbranched polyurethane

[0014]

[0015] (3) Synthesis of aldehyde-terminated hyperbranched polymer leather retanning agent

[0016]

Embodiment 2

[0018] First, mix ethyl acrylate and diisopropanolamine at a molar ratio of 1:1.8, add 30 mL of absolute ethanol as a solvent, stir and react at 30°C for 5 hours, remove the solvent under reduced pressure, add ethyl acrylate and diisopropanolamine Concentrated sulfuric acid with 3% of the total mass of propanolamine is acid-catalyzed, and vacuumized (vacuum degree is 0.1MPa) at 130° C. for 2 hours to obtain a hydroxyl-terminated hyperbranched polyamine-ester; the hydroxyl-terminated hyperbranched polyurethane is combined with Glutaraldehyde (distilled to remove water before use) was mixed at a molar ratio of 2.5:1, p-toluenesulfonic acid with a total mass of 4% of the reactants was added, 50mL of water-carrying agent cyclohexane was added, and the reaction was stirred at 120°C for 1.5h. Can.

Embodiment 3

[0020] First, mix butyl acrylate and diethanolamine at a molar ratio of 1:2.1, add 35 mL of anhydrous isopropanol as a solvent, stir and react at 40°C for 3 hours, remove the solvent under reduced pressure, add ethyl acrylate and diisopropyl The concentrated sulfuric acid of alcohol amine gross mass 5% carries out acidic catalysis, under 100 ℃ vacuumizes (vacuum degree is 0.08MPa) reaction 2.5h, makes terminal hydroxyl hyperbranched polyamine-ester; The hydroxyl of terminal hydroxyl hyperbranched polyurethane and Glutaraldehyde (distilled to remove water before use) was mixed at a molar ratio of 2.1:1, dry HCl of 3% of the total mass of reactants was added, 40mL of water-carrying agent cyclohexane was added, and the reaction was stirred at 140°C for 0.5h.

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Abstract

The invention relates to a processing method of a leather retanning agent, in particular to a leather retanning agent of a hyperbranched polymer with terminal aldehyde group, which aims to solve the problems in the prior art of low reaction activity, large addition and unobvious effect. The technical proposal is that: firstly, the acrylate and the alcohol amine are blended, a proper amount of a fatty alcohol as the solvent with a low-carbon chain is added into the mixture, the solvent are removed by ice-dry after the agitation and reactions, acid catalyst are added to carry out acid catalysis, the mixture reacts in vacuum and hyperbranched polyamine-ester with the terminal aldehyde group is obtained; secondly, the hyperbranched polyamine-ester with the terminal aldehyde group and the glutaraldehyde water in which is removed by distillation are blended, acid catalyst is added into the mixture and then the mixture is agitated and takes reactions. The leather retanning agent has the advantages that: the tear strength of collagen fiber is increased significantly, the processing method of the leather retanning agent provides favorable improvement to the collagen fiber with a small addition; thus, the leather retanning agent has the advantages of high efficiency and environment protection.

Description

Technical field: [0001] The invention relates to a preparation method of a leather retanning agent, in particular to an aldehyde-terminated hyperbranched polymer leather retanning agent and a preparation method thereof. Background technique: [0002] The main purpose of retanning is to further supplement the tanning effect and improve the softness, compactness, fullness, moisture resistance and stability of leather. At present, the existing retanning agents can be roughly divided into two categories: one is inorganic salts, such as basic chromium salts, zirconium salts and aluminum salts, etc.; the other is organic substances, such as vegetable tanning agents and syntans. , Resin tanning agent and aldehyde tanning agent, etc. Facts have found that these two types of retanning agents all have weak points: the resources of inorganic metal salt retanning agents themselves are limited, and individual metals themselves are toxic (for example: Cr +6 Severe carcinogenicity), thus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/22
Inventor 王学川强涛涛袁绪政任龙芳
Owner SHAANXI UNIV OF SCI & TECH
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