Preparation method of non-ionic waterborne polyurethane-polyacrylate composite emulsion for leather finishing

A technology of polyacrylate and water-based polyurethane, which is applied in polyurea/polyurethane coatings, leather surface treatment, small raw hide/large raw hide/leather/fur treatment, etc. It can solve the problems of poor compound stability and achieve low viscosity and good Embossed shape and texture, and the effect of improving freeze-thaw resistance

Active Publication Date: 2014-04-16
SICHUAN DOWELL SCI & TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above patent information shows that the resins prepared by the above two methods are both ionic emulsions, and are mainly anionic systems, and their compounding stability in cationic systems used in leather, especially shoe leather back covers, is poor

Method used

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  • Preparation method of non-ionic waterborne polyurethane-polyacrylate composite emulsion for leather finishing
  • Preparation method of non-ionic waterborne polyurethane-polyacrylate composite emulsion for leather finishing

Examples

Experimental program
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Embodiment 1

[0053] The number average molecular weight after vacuum dehydration is 10.0g of polyoxypropylene glycol of 2000, hydroxyl value 56mgKOH / g, 4.0g of isophorone diisocyanate, 9.2g of trimethylolpropane polyethylene glycol monomethyl ether , Add 0.024g of catalyst dibutyltin dilaurate into a 250mL reaction vessel, control the temperature under mechanical stirring and react at 85°C for 3 hours, take a sample to measure the NCO content, when the NCO content reaches the predetermined value (0.0076mol) or below, put The temperature of the system is lowered to room temperature, add 3.60g of butyl acrylate, 4.00g of methyl methacrylate, and 4g of acetone, continue to stir for 15-30 minutes, add 26g of deionized water under high shear force at 950rpm, emulsify for 2min, and then add 70g Deionized water, continue to emulsify for 13 minutes, reduce the stirring speed, dropwise add a hydrazine hydrate solution composed of 0.24g hydrazine hydrate (mass fraction 80%) and 4g water, react for 1 ...

Embodiment 2

[0069] After vacuum dehydration, 16.8g of polycarbonate diol PCD with a number average molecular weight of 2000 and a hydroxyl value of 53-59mgKOH / g, 8.0g of isophorone diisocyanate, trimethylolpropane polyethylene glycol monomethyl Add 11.6g of ether and 0.08g of catalyst dibutyltin dilaurate into a 250mL reaction vessel, control the temperature under mechanical stirring and react at 85°C for 3 hours, then take a sample to measure the NCO content, when the NCO content reaches the predetermined value (0.0321mol) or below When the temperature of the system was lowered to room temperature, 6.6 g of butyl acrylate, 5.0 g of methyl methacrylate, and 6 g of acetone were added, and the stirring was continued for 15 to 30 minutes. Then, 26 g of deionized water was added under high shear force at 950 rpm, and emulsified for 2 min. Then add 70g of deionized water, continue to emulsify for 13 minutes, reduce the stirring speed, dropwise add a hydrazine hydrate solution consisting of 1.00...

Embodiment 3

[0071] After vacuum dehydration, 8.62g of polyoxypropylene glycol with a number average molecular weight of 1000 and a hydroxyl value of 112mgKOH / g, 6.75g of isophorone diisocyanate, and 9.59g of trimethylolpropane polyethylene glycol monomethyl ether , Add 0.025g of catalyst dibutyltin dilaurate into a 250mL reaction vessel, control the temperature under mechanical stirring and react at 85°C for 3 hours, take a sample to measure the NCO content, when the NCO content reaches the predetermined value (0.0244mol) or below, put The temperature of the system is lowered to room temperature, add 5.24g of butyl acrylate, 1.13g of methyl methacrylate, 4g of acetone, continue to stir for 15-30 minutes, add 27g of deionized water under high shear force at 950rpm, emulsify for 2min, then add 53g Deionized water, continue to emulsify for 13 minutes, reduce the stirring speed, dropwise add a hydrazine hydrate solution composed of 0.76g hydrazine hydrate (mass fraction 80%) and 4g water, reac...

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Abstract

The invention relates to a preparation method of non-ionic waterborne polyurethane-polyacrylate composite emulsion for leather finishing. The preparation method comprises the following steps: after low polymer dihydric alcohol, diisocyanate and a hydrophilia chain extender are stirred for reaction, cooling to indoor temperature and adding an acrylate monomer and a certain amount of a solvent for reducing viscosity; adding water for emulsification under the high-speed dispersion; then adding a micromolecule polyamine chain extender to conduct chain extension in water to obtain an acrylate monomer-polyurethane waterborne dispersing emulsion; then introducing nitrogen, heating, dropwise adding a water solution containing an initiator to trigger seeding emulsion polymerization, and continuously keeping warm to obtain the composite emulsion. The composite emulsion prepared by the invention has the advantages of low viscosity, good permeability, emulsion stability, freeze-thaw resistance, hydrolytic resistance, and excellent electrolyte resistance and acid-base resistance property, can be used for compounding with anion resin and further with cationic resin, has an excellent knurling setting property, and is particularly suitable for being used as a leather finishing agent.

Description

technical field [0001] The invention belongs to the technical field of production of leather finishing polymer materials, and in particular relates to a preparation method of a nonionic water-based polyurethane-polyacrylate composite emulsion whose side chain is a repeating ethoxyl structure. Background technique [0002] Waterborne polyurethane has been widely used in the fields of coatings, adhesives, leather finishing and inks due to its low VOC content and excellent performance. The dispersion of polyurethane in water is achieved by external emulsification or internal emulsification. The external emulsification method is rarely used due to strict process control, poor emulsion stability, easy precipitation, and poor water resistance of the coating film. The polyurethane emulsion prepared by internal emulsification can be divided into ionic type and nonionic type according to the type of hydrophilic monomer. Ionic water-based polyurethane emulsion, due to the introducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F299/06C08G18/83C08G18/66C08G18/48C08G18/44C09D157/00C09D157/12C09D175/04D06M15/21D06M15/564C14C11/00
Inventor 陆银锋严建林
Owner SICHUAN DOWELL SCI & TECH INC
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