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

A technology of hyperbranched polymer and terminal hydroxyl hyperbranching, which can be used in small hide/big hide/leather/fur treatment, small hide/big hide/leather/fur chemical treatment, tanning treatment, etc. Obvious, large usage, low reactivity and other problems, to achieve the effect of high reactivity, small usage, and improved tear strength

Inactive Publication Date: 2010-06-02
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] First, methyl acrylate and diethanolamine were mixed at a molar ratio of 1:1.3, and 20 mL of anhydrous methanol was added as a solvent. After the reaction was stirred at 35 °C for 7 h, the solvent was removed under reduced pressure, and 4% by mass of p-toluenesulfonic acid was added. Acid catalyzed by acid, vacuumed at 120°C (vacuum degree of 0.05MPa) and reacted for 3h to obtain hydroxyl-terminated hyperbranched polyamine-ester; Distillation to remove water) mix at a molar ratio of 2:1, add concentrated sulfuric acid with a mass percentage of 2%, add 35 ml of cyclohexane, and stir and react at 100 ° C for 3 h.

[0010] The reaction scheme is as follows:

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

[0012]

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

[0014]

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

[0016]

Embodiment 2

[0018] First, ethyl acrylate and diisopropanolamine were mixed at a molar ratio of 1:1.8, and 30 mL of absolute ethanol was added as a solvent. After stirring and reacting at 30 °C for 5 h, the solvent was removed under reduced pressure, and ethyl acrylate and diisopropanol were added. The concentrated sulfuric acid containing 3% of the total mass of propanolamine was subjected to acid catalysis, and the reaction was carried out under vacuum at 130 ° C (the vacuum degree was 0.1 MPa) for 2 h to obtain the hydroxyl-terminated hyperbranched polyamine-ester; the hydroxyl-terminated hyperbranched polyamine-ester was The hydroxyl group and glutaraldehyde (distilled to remove water before use) are mixed in a molar ratio of 2.5:1, add 4% p-toluenesulfonic acid of the total mass of the reactant, add 50 mL of cyclohexane with water agent, and stir the reaction at 120 ° C 1.5h is enough.

Embodiment 3

[0020] First, butyl acrylate and diethanolamine were mixed at a molar ratio of 1:2.1, and 35 mL of anhydrous isopropanol was added as a solvent. After stirring and reacting at 40 °C for 3 h, the solvent was removed under reduced pressure, and ethyl acrylate and diisopropyl alcohol were added. The concentrated sulfuric acid containing 5% of the total mass of alkanolamine is acid catalyzed, and the reaction is carried out under vacuum at 100 ° C (the vacuum degree is 0.08 MPa) for 2.5 h to obtain the hydroxyl-terminated hyperbranched polyamine-ester; the hydroxyl-terminated hyperbranched polyamine-ester is The hydroxyl group and glutaraldehyde (water was distilled off before use) were mixed in a molar ratio of 2.1:1, dry HCl of 3% of the total mass of the reactant was added, 40 mL of cyclohexane with water was added, and the reaction was stirred at 140 ° C for 0.5 h That's it.

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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, tightness, fullness, humidity and heat resistance 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, synthetic tanning agents , resin tanning agents and aldehyde tanning agents. Practice has found that these two types of retanning agents have shortcomings: the resources of inorganic metal salt retanning agents are limited, and individual metals themselves are toxic (for example: Cr +6 Severe carcinogenicity), thu...

Claims

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Application Information

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Patent Type & Authority Patents(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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