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Anion water-soluble polyurethane disperse system for finishing leather and method for preparing same

A polyurethane dispersion, water-based polyurethane technology, applied in polyurea/polyurethane coatings, devices for coating liquids on surfaces, coatings, etc., can solve problems such as reducing mechanical properties, and achieve improved stability, high coating film strength, The effect of easy availability of raw materials

Active Publication Date: 2011-04-20
WANHUA CHEM BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Disclosed in CN101003613A is a kind of preparation method of diphenylmethane diisocyanate-based aqueous polyurethane dispersion liquid, in this method, because adopted inert isocyanate simultaneously, therefore also reduced the mechanical property of product

Method used

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  • Anion water-soluble polyurethane disperse system for finishing leather and method for preparing same
  • Anion water-soluble polyurethane disperse system for finishing leather and method for preparing same
  • Anion water-soluble polyurethane disperse system for finishing leather and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

example 1-4

[0058] Example 1~4 adopts MDI-50 (2,4-diphenylmethane diisocyanate content 51.75%, 4,4-diphenylmethane diisocyanate content 48.13% and 2,2-diphenylmethane diisocyanate isomerization content of 0.12%) and DL1000P to prepare the dispersion, and the viscosity of the synthesized prepolymer, the particle size of the waterborne polyurethane dispersion, the mechanical properties of the waterborne polyurethane after film formation, the tensile strength and the elongation at break were characterized. The results are shown in Table 1.

example 1

[0060] Add 125.13 grams of MDI-50 and 204.64 grams of polypropylene oxide ether glycol DL1000P into the four-necked bottle, pass through dry nitrogen, start stirring and gradually raise the temperature to 70 ° C, after 2 hours, cool the reactant to 50 ° C, add 21.32 grams DMPA and 100 grams of acetone were kept at a reaction temperature of 60°C. After 1.5 hours of reaction, 95 grams of acetone was added to lower the temperature to 50°C, and 4.68 grams of 1,4-butanediol was added. After 1.5 hours of reaction, the chain extension reaction was considered complete.

[0061] Lower the temperature of the prepolymer below 40°C, add 16.06 grams of triethylamine, continue to cool down to below 30°C, use a FLUKO homogenizer, add deionized water to disperse under the condition of rapid stirring, the dispersion speed is 10000rpm, and then add 1.06 g of ethylenediamine. Finally, the acetone was distilled off under reduced pressure to obtain a stable aqueous polyurethane dispersion.

example 2

[0063] Add 130.78 grams of MDI-50 and 197.3 grams of polypropylene oxide ether glycol DL1000P into a four-necked bottle, add two drops of stannous octoate (about 0.05g) dropwise, pass in dry nitrogen, start stirring and gradually heat up to 70°C, 2 After one hour, the reactant was cooled to 50°C, 21.43 grams of DMPA and 100 grams of acetone were added, and the reaction temperature was maintained at 60°C. After 1.5 hours of reaction, 95 grams of acetone was added again to lower the temperature to 50°C, and 6.77 grams of 1,4-butanediol was added. Alcohol, after 1.5 hours of reaction, the chain extension reaction was considered complete.

[0064] Lower the temperature of the prepolymer below 40°C, add 16.15 grams of triethylamine, continue to cool down to below 30°C, use a FLUKO homogenizer, add deionized water to disperse under the condition of rapid stirring, the dispersion speed is 10000rpm, and then add 0.82 grams of ethylenediamine. Finally, the acetone was distilled off un...

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Abstract

The invention relates to an anion aqueous polyurethane dispersoid for leather finishing. The anion aqueous polyurethane dispersoid mainly is mainly prepared by the following raw materials by mass portion: 100 mass portions of polyether polyalcohol, 30 to 80 mass portions of diphenylmethane diisocyanate isomer combination, 6 to 15 mass portions of diol containing carboxyls, 0.5 to 6 mass portions of micromolecular cross-linker and 0.2 to 4 mass portions of amine chain extender; and 0.001 to 1 mass portion of catalyzer is an alternative. The dispersoid has the advantages of good mechanical performance, solvent resistance, hydrolysis resistance, high strength, rapid solidification, etc.

Description

technical field [0001] The invention relates to an anionic aqueous polyurethane dispersion for leather finishing and a preparation method thereof. Background technique [0002] With the development of the tanning industry, leather products are more and more widely used in people's daily life, such as sofa leather, upper leather, garment leather and so on. Finishing is an important process in the leather manufacturing process. It has a vital impact on the appearance, hygienic performance and physical and mechanical properties of leather products. Through the finishing operation, the beauty and durability of leather can be increased, and the grade of products can be improved. It can also increase the varieties of designs and colors and expand the scope of use. Leather finishing agents are generally prepared step by step from film-forming substances, coloring materials, and solvents in a certain proportion, and the film-forming substances are the basis of leather finishing age...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08G18/76C09D175/08B05D7/12
Inventor 黄岐善魏艳飞齐莹闫泽群
Owner WANHUA CHEM BEIJING
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