A preparation method of a chrome-free tanned leather retanning agent based on hydrogen bond self-assembly

A self-assembly, chrome-free tanning technology, applied in small raw hide/big raw hide/leather/fur treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, animal husbandry, etc. With the retanning function, the retanning filling performance cannot be significantly improved, etc., to achieve good retanning filling performance, good retanning filling effect, and enhanced hydrogen bond assembly effect

Inactive Publication Date: 2016-06-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diblock polyurethane surfactant used in this invention only provides the effect of surfactant to help penetration, and it does not have the retanning function itself. The retanning is mainly based on acrylic resin, so that the retanning filling property cannot be significantly improved, and No assembly structure is formed in hydrogen bond recombination, which makes the stability of chrome-free tanned leather after retanning not high enough, so the application is limited

Method used

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  • A preparation method of a chrome-free tanned leather retanning agent based on hydrogen bond self-assembly
  • A preparation method of a chrome-free tanned leather retanning agent based on hydrogen bond self-assembly
  • A preparation method of a chrome-free tanned leather retanning agent based on hydrogen bond self-assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Synthesis of (meth)acrylic resin

[0043] Add 140 g of distilled water, 16.3 g of acrylic acid monomer and 2.3 g of methyl acrylate into a four-necked flask with a stirrer and a reflux condenser. Start the stirrer, stir and mix for 30 minutes; add 0.02g ammonium persulfate, continue stirring for 10 minutes, then raise the temperature to 80°C; System pH to 6.0. That is, a (meth)acrylic resin with a solid content of 10 wt % was obtained.

[0044] 2. Synthesis of Triblock Nonionic Amphiphilic Polyurethane Resin

[0045] Under the conditions of 120° C. and a vacuum of 0.09 MPa, the polyoxypropylene ether and the mono-blocked polyoxyethylene ether were distilled under reduced pressure for 120 minutes to remove moisture. Add 5.6g of polyoxypropylene ether with a molecular weight of 1000 to a four-necked bottle with a stirrer and a thermometer, heat to 80°C while stirring, add 0.0lg of dibutyltin dilaurate, stir and mix for 10min, then add 2.8g dropwise The toluene diis...

Embodiment 2

[0049] 1. Synthesis of (meth)acrylic resin

[0050] Add 140 g of distilled water, 16.3 g of methacrylic acid monomer and 2.3 g of methyl acrylate into a four-necked flask equipped with a stirrer and a reflux condenser. Start the stirrer, stir and mix for 30 minutes; add 0.02g ammonium persulfate, continue stirring for 10 minutes, then raise the temperature to 80°C; System pH to 6.0. That is, a (meth)acrylic resin with a solid content of 10 wt % was obtained.

[0051] 2. Synthesis of Triblock Nonionic Amphiphilic Polyurethane Resin

[0052] Under the conditions of 120° C. and a vacuum of 0.09 MPa, the polyoxypropylene ether and the mono-blocked polyoxyethylene ether were distilled under reduced pressure for 120 minutes to remove moisture. Add 5.6g of polyoxypropylene ether with a molecular weight of 1000 to a four-necked bottle with a stirrer and a thermometer, heat to 80°C while stirring, add 0.0lg of dibutyltin dilaurate, stir and mix for 10min, then add 2.8g dropwise The...

Embodiment 3

[0056] 1. Synthesis of (meth)acrylic resin

[0057] Add 140 g of distilled water, 16.3 g of acrylic acid monomer and 2.3 g of methyl acrylate into a four-necked flask with a stirrer and a reflux condenser. Start the stirrer, stir and mix for 30 minutes; add 0.02g ammonium persulfate, continue stirring for 10 minutes, then raise the temperature to 80°C; System pH to 6.0. That is, a (meth)acrylic resin with a solid content of 10 wt % was obtained.

[0058] 2. Synthesis of Triblock Nonionic Amphiphilic Polyurethane Resin

[0059] Under the conditions of 120° C. and a vacuum of 0.09 MPa, the polyoxypropylene ether and the mono-blocked polyoxyethylene ether were distilled under reduced pressure for 120 minutes to remove moisture. Add 5.6g of polyoxypropylene ether with a molecular weight of 2000 to a four-necked bottle with a stirrer and a thermometer, heat to 80°C while stirring, add 0.0lg of dibutyltin dilaurate, stir and mix for 10min, then add 2.8g dropwise The isophorone d...

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Abstract

The invention relates to a chrome-free tanning leather retanning agent which is based on hydrogen bond self-assembly and contains (methyl) acrylic resin and triblock non-ionic type parent polyurethane resin and a preparing method of the chrome-free tanning leather retanning agent. The retanning agent is characterized in that hydrogen bond assembly units of the retanning agent are the (methyl) acrylic resin and the triblock non-ionic type parent polyurethane resin, the assembly units are made of traditional leather retanning materials widely applied, and the application effect of the traditional leather retanning materials is generally accepted. Due to the fact that the hydrogen bond assembly effect of the assembly units is enhanced along with reducing of pH values, appropriate molecular structures are selected to enable a system to carry out assembling and settling at the needed pH value and are selectively arranged between leather collagen fibers in a filling mode, and physical and mechanical properties of the chrome-free tanning leather are close to those obtained after retanning is carried out on the chrome tanning leather and good soft fullness, good hand feeling and the like are endowed to the chrome-free tanning leather. The method can be used in cooperation with the novel chrome-free tanning technology, seamless conversion from a traditional chrome tanning leather retanning system to a clean chrome-free tanning retanning system is achieved, and the method is hopeful to become an important part of the tanning cleaning technology.

Description

technical field [0001] The invention relates to the field of chrome-free tanned leather retanning, in particular to a chrome-free tanned leather retanning agent constructed based on hydrogen bond self-assembly of (meth)acrylic resin and triblock nonionic amphiphilic polyurethane resin and a preparation method thereof. Background technique [0002] Retanning has the reputation of "alchemy" in the tanning process. Through retanning, the quality of the tanned leather can be further improved, making the finished leather plump, soft, and have better flexibility and elasticity. In the traditional tanning industry, polymer resin retanning agent has been widely used because of its mature preparation and application process, many active groups and good structure adjustability, and is currently the most widely used retanning agent. Among them, the use of acrylic resin retanning agent is the most common, followed by polyurethane resin retanning agent. [0003] In the traditional tann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48
CPCC08F220/06C08G18/283C08G18/48C08G18/4804C14C3/22C08F220/14
Inventor 金勇李汉平
Owner SICHUAN UNIV
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