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Modified polyurethane soap-free emulsion for leather finishing and preparation method thereof

A soap-free emulsion and water-based polyurethane technology, which is applied in the field of polymers, can solve the problem of dry and wet rubbing resistance of coating agents, poor film compactness, smoothness and gloss, poor freeze-thaw stability and mechanical stability, Solve problems such as performance limitations of coating materials, and achieve the effects of low cost, excellent wear resistance, and high emulsion stability

Active Publication Date: 2017-05-31
派兔信息技术(广州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The major disadvantages of the currently used water-emulsion type finishing agents are: (1) the extensive use of emulsifiers has a considerable impact on the environment; (2) the use of emulsifiers limits the further improvement of the performance of coating materials
For example, in the case of low temperature and high humidity, the drying is slow, it is difficult to form a film, the film is prone to mildew, easy to pollute, not wear-resistant, the freeze-thaw stability and mechanical stability are not good, the dry and wet rubbing resistance of the coating agent, the film-forming Density, flatness and gloss are not good, etc.

Method used

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  • Modified polyurethane soap-free emulsion for leather finishing and preparation method thereof
  • Modified polyurethane soap-free emulsion for leather finishing and preparation method thereof
  • Modified polyurethane soap-free emulsion for leather finishing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A modified polyurethane soap-free emulsion for leather finishing, which is made of the following components in parts by weight:

[0030]

[0031] The water-based polyurethane emulsion is prepared by ultrasonic dispersion from the following parts by weight: 30-35 parts of polyester diol, 10-20 parts of HDI, 0.5-2 parts of organotin catalyst, 5 parts of DMPA -8 parts, NMP 18-22 parts, methylolpropane 5-7 parts, acetone 20-30 parts, magnetic chitosan nanoparticles 3-9 parts, ethylenediamine aqueous solution 15-20 parts.

[0032] Described polyester diol is the polycarbonate diol that relative molecular weight is 2000; The mass fraction of described ethylenediamine aqueous solution is 10-12%; The particle diameter of described magnetic chitosan nano-particle is 18 -24nm.

[0033] The water-soluble epoxy resin is one of 681 water-soluble epoxy resin and 682 water-soluble epoxy resin.

[0034] A kind of preparation method of modified polyurethane soap-free emulsion for a...

Embodiment 2

[0048] The modified polyurethane soap-free emulsion for leather finishing provided in this embodiment and its preparation method are basically the same as in Example 1, except that: a modified polyurethane soap-free emulsion for leather finishing consists of the following parts by weight: The components are made of:

[0049]

[0050] The water-based polyurethane emulsion is prepared from the following parts by weight by ultrasonic dispersion: 30 parts of polyester diol, 10 parts of HDI, 0.5 parts of organotin catalyst, 8 parts of DMPA, 18 parts of NMP, 7 parts of methylolpropane, 20 parts of acetone, 6 parts of magnetic chitosan nanoparticles, and 20 parts of ethylenediamine aqueous solution.

[0051] The polyester diol is polycarbonate diol with a relative molecular weight of 2000; the mass fraction of the ethylenediamine aqueous solution is 10%; the particle diameter of the magnetic chitosan nanoparticles is 24nm.

[0052]Described water-soluble epoxy resin is 681 water-...

Embodiment 3

[0067] The modified polyurethane soap-free emulsion for leather finishing provided in this embodiment and its preparation method are basically the same as those in Examples 1 and 2, except that a modified polyurethane soap-free emulsion for leather finishing consists of the following weight The number of servings made from the ingredients:

[0068]

[0069] The water-based polyurethane emulsion is prepared from the following parts by weight by ultrasonic dispersion: 32 parts of polyester diol, 18 parts of HDI, 1.5 parts of organotin catalyst, 6 parts of DMPA, 20 parts of NMP, 6 parts of methylolpropane, 25 parts of acetone, 3 parts of magnetic chitosan nanoparticles, and 18 parts of ethylenediamine aqueous solution.

[0070] The polyester diol is polycarbonate diol with a relative molecular weight of 2000; the mass fraction of the ethylenediamine aqueous solution is 11%; the particle diameter of the magnetic chitosan nanoparticles is 20nm.

[0071] Described water-soluble ...

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Abstract

The invention discloses a modified polyurethane soap-free emulsion for leather finish. The modified polyurethane soap-free emulsion comprises components as follows: 20-30 parts of a waterborne polyurethane emulsion, 3-6 parts of a K2S208 initiator, 10-20 parts of 3-allyloxy-2-hydroxypropyl sodium iodate, 25-35 parts of water soluble epoxy resin and 20-28 parts of polyacrylamide, wherein the waterborne polyurethane emulsion is prepared with an ultrasonic dispersion method. The invention further discloses a preparation method of the modified polyurethane soap-free emulsion for leather finish. The preparation method comprises steps as follows: (1), preparation of the waterborne polyurethane emulsion; (2), preparation of the modified polyurethane soap-free emulsion. The product provided by the invention is environment-friendly, has high solid content, good film forming property, excellent coating compactness and wear resistance and high emulsion stability, and is suitable for a leather finishing agent, the preparation method of the modified polyurethane soap-free emulsion has low cost, the process is reasonable, and large-scale production can be facilitated.

Description

technical field [0001] The invention relates to the field of polymers, in particular to a modified polyurethane soap-free emulsion for leather finishing and a preparation method thereof. Background technique [0002] Soap-free emulsion polymerization refers to the emulsion polymerization process in which no emulsifier is added at all or only a small amount of emulsifier (its concentration is less than the critical micelle concentration CMC) is added during the reaction. Because soap-free emulsion polymerization can obtain latex particles with uniform size and clean surface, it can improve the compactness, water resistance, scrub resistance and adhesion of emulsion coatings, and has attracted much attention. But the stability of soap-free emulsion is an important factor limiting its large-scale industrialization. [0003] It is a potential market for the application of soap-free emulsions as leather finishing materials, but there are still relatively few studies on the appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D151/08C09D133/26C14C11/00C08F291/12C08F291/10C08G18/66C08G18/44C08G18/34C08G18/32C08G18/64
CPCC08F291/10C08F291/12C08G18/3228C08G18/348C08G18/4081C08G18/44C08G18/6484C08G18/6648C08G18/6659C08L2205/02C09D151/08C14C11/006C08L33/26C08F216/1475
Inventor 梁洪文冯蓉
Owner 派兔信息技术(广州)有限公司
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