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Low-luster aqueous polyurethane dispersion for leather, and preparation method and application thereof

A water-based polyurethane and dispersion technology, applied in polyurea/polyurethane coatings, textiles, papermaking, coatings, etc., can solve problems such as difficult artificial leather and synthetic leather applications, expensive solutions, solvent residues, etc., to achieve catalyst safety and environmental protection, Increased micro-roughness and improved rub resistance

Active Publication Date: 2013-09-25
清远市美佳乐环保新材股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patents all describe the method of avoiding the use of external matting agents such as silicon dioxide to obtain a low-gloss coating surface, but these technical solutions all provide complex and expensive solutions, including the use of solvents and powders; WO2012020026A1 describes a non- Ionic one-component aqueous polyurethane dispersion and preparation method thereof
Since the synthesis of the prepolymer in this method uses acetone or butanone, although part of the organic solvent can be removed in the subsequent decompression operation, there will still be part of the solvent remaining in the product; Chinese patent CN1735642A describes a preferred method that does not use two The low-gloss coating film of silica matting agent, from the description of the patent, it is found that a large amount of solvent is still used in the prepolymer preparation process, and the coating film undergoes self-crosslinking during drying, including self-oxidation and Schiff base crosslinking Condensation with silane, etc., so it is difficult to apply on the fast artificial leather synthetic leather finishing industrial production line

Method used

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  • Low-luster aqueous polyurethane dispersion for leather, and preparation method and application thereof
  • Low-luster aqueous polyurethane dispersion for leather, and preparation method and application thereof
  • Low-luster aqueous polyurethane dispersion for leather, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038](1) After dehydrating 110g polytetrahydrofuran diol (PTMG‐1000, 1000g / mol, Mitsubishi Chemical Corporation), 4.2g dimethylolpropionic acid (DMPA, Perstorp, Sweden), cool to 60 ℃, add 4 drops of organic bismuth catalyst (Bicat8108, American leading chemical), and mix well. Under nitrogen protection, continue to drop into 54g isophorone diisocyanate (IPDI, Bayer Materials Science) to carry out prepolymerization reaction, every 15 minutes extract sample and judge reaction end point with n-butylamine titration, when -NCO value reaches 4.3 (theoretical value 5.08) when the prepolymer is cooled to about 60 ° C;

[0039] (2) Add 4.3g of neutralizing agent tripropylamine to the product of step (1) to neutralize and form salt for 30 minutes, and further cool to 30°C;

[0040] (3) Put the product of step (2) into a solution containing 3g of sodium sulfamate chain extender (VESTAMIN A95, Evonik Degussa) and 300g of deionized water, continue to emulsify and extend the chain for 30 ...

Embodiment 2

[0044] (1) 110g polytetrahydrofuran diol (PTMG‐1000, 1000g / mol, Japan Mitsubishi Chemical Co., Ltd.), 4.4g dimethylol propionic acid (DMPA, Swedish Perstorp Company) were dehydrated and cooled to 60 ℃, add 4 drops of organic bismuth catalyst (Bicat8108, American leading chemical), and mix well. Under the protection of nitrogen, continue to drop into 62g isophorone diisocyanate (IPDI, Bayer Materials Science) to carry out prepolymerization reaction, every 15 minutes extract the sample and use n-butylamine titration method to judge the reaction end point, when -NCO value reaches 5.7 (theoretical value When it is 6.49), the prepolymer is cooled to about 60°C;

[0045] (2) Add 3.2g neutralizing agent triethylamine to the product of step (1) to neutralize and form salt for 20 minutes, and further cool to 30°C;

[0046] (3) Put the product of step (2) into a solution containing 3g of sodium sulfamate chain extender (X506, BASF, Germany) and 300g (or 600g) of deionized water, contin...

Embodiment 3

[0050] (1) 220g polytetrahydrofuran diol (PTMG‐2000, 2000g / mol, Japan Mitsubishi Chemical Co., Ltd.), 6.2g dimethylol propionic acid (DMPA, Swedish Perstorp Company) were dehydrated and cooled to 70 ℃, add 6 drops of organic bismuth catalyst (Bicat8108, American leading chemical), and mix well. Under the protection of nitrogen, continue to drop into 64g isophorone diisocyanate (IPDI, Bayer Materials Science) to carry out prepolymerization reaction, every 15 minutes extract the sample and use n-butylamine titration method to judge the reaction end point, when -NCO value reaches 3.4 (theoretical value When it is 3.82), the prepolymer is cooled to about 60°C;

[0051] (2) Add 4.5 g of neutralizing agent triethylamine to the product of step (1) to neutralize and form salt for 40 minutes, and further cool to 45°C;

[0052] (3) Put the product of step (2) into a solution containing 4g of sodium sulfamate chain extender (VESTAMIN A95, Evonik Degussa) and 400g of deionized water, con...

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Abstract

The invention discloses a low-luster aqueous polyurethane dispersion for leather, and a preparation method and an application thereof. The preparation method comprises the following steps: dehydrating aliphatic polymeric diol and dihydroxymethylpropionic acid, cooling to 60-80DEG C, and adding an organic bismuth catalyst and diisocyanate for a prepolymerization reaction; neutralizing by a neutralizing agent for salt formation; carrying out emulsification and chain extension in a sodium sulfamate chain extender; and completely reacting isocyanate residual in the dispersion with the an added hydrazine chain extender to obtain the aqueous polyurethane dispersion having a solid content of 25-35wt% and an average emulsion particle size of 180-5000nm. A low luster film effect can be obtained through the dispersion. The low luster effect of the polyurethane dispersion is completely generated through a film forming resin, so the polishing resistance of a low luster surface is improved, thereby the dispersion is especially suitable for the formulas of surface mist-surface finishing agents for frequently bent scratched and tensioned vamp leather, clothing leather and automobile interior decorations.

Description

technical field [0001] The invention relates to a polyurethane dispersion, in particular to a method for preparing a low-gloss water-based polyurethane dispersion for leather; it also relates to the application of the dispersion in leather finishing agents. Background technique [0002] Leather finishing agent is a product for post-processing leather to give leather a special luster and feel. Most of the existing low-gloss leather finishing agents use solvent-based polyurethane resins. When the film is formed, with the volatilization of the solvent, the film becomes thinner and shrinks, and the silica particles suspended in the resin protrude on the top layer of the film to form a microscopic rough surface. The microscopically rough surface diffuses incident light, resulting in a low-gloss effect and soft touch. [0003] Since water-based polyurethane is a low-viscosity liquid in which colloidal particles are uniformly dispersed in water, it relies on the fusion of polymer ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/44C08G18/34C08G18/12C08G18/30D06M15/572D06M15/568C09D175/06C09D175/08
Inventor 曹喜民彭晓宏曾文波张雅胜关仲翔
Owner 清远市美佳乐环保新材股份有限公司
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