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Cationic-nonionic water-based polyurethane-polyacrylate composite emulsion and preparation method thereof

A technology of water-based polyurethane and polyacrylate, which is applied in coatings, textiles, papermaking, fiber treatment, etc. It can solve the problems of large emulsion particle size, complicated process, and many steps, and achieve good cross-linking function, advanced preparation method, The effect of excellent surface properties

Active Publication Date: 2014-08-27
传化智联股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these four methods, the first method has many steps, complicated process, and the product quality is not stable enough; although the emulsion particles prepared by the second method have a special structure, except for a small part of PU colloidal particles cross-linked with PA molecules Outside the chain, most of them still exist as pure PU and PA, and their comprehensive properties cannot fully exert the respective characteristics of PU resin and PA resin; the emulsion prepared by the third method can make PU and PA chains reach the molecular scale. Blending, although the performance of the composite emulsion has been improved, the particle size of the emulsion is larger; the emulsion prepared by the fourth method is to connect PU and PA through the action of chemical bonds, which has a higher degree of compounding and better emulsion performance. Good, but the emulsion prepared by this method still has the defect of large emulsion particle size, and its particle size is generally in the micron range, which has not yet reached the level of composite nano-water dispersion

Method used

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  • Cationic-nonionic water-based polyurethane-polyacrylate composite emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dehydrate 120g of polybutylene adipate at 120°C under high temperature and vacuum conditions, then lower it to 70°C, slowly add 87g of toluene diisocyanate, react at 85-90°C for 1 hour, add 5.4g of butanediol Alcohol, react at 85-90°C for 1 hour; then lower the temperature to 50°C, slowly add a mixture of 20g butanone and 12g N-methyldiethanolamine dropwise, drop the mixture in 1 hour, then raise the temperature to 65°C, and keep it warm for 2 hours to obtain NCO-terminated prepolymer, adding 70g butanone to dilute and cool down; slowly add 10g hydroxypropyl acrylate and 7g butanone oxime dissolved in 20g butanone to the NCO-terminated prepolymer, react at 60°C for 1.5 Hours later, lower the temperature to 45°C, add 6g of acetic acid for quaternization, then slowly add 735g of deionized water for emulsification, and finally extract the butanone therein to obtain a chemically bonded self-emulsifying PU seed emulsion; The dosage is regarded as 100 parts. Based on this, 15...

Embodiment 2

[0036] Dehydrate 125g of polyethylene glycol at 120°C under high temperature and vacuum conditions, then lower it to 70°C, slowly add 111g of isophorone diisocyanate, react at 85-90°C for 1 hour, add 6.4g of diisocyanate Ethylene glycol, react at 85-90°C for 1 hour; then lower the temperature to 50°C, slowly add a mixture of 20g of butanone and 24.1g of N-benzyldiethanolamine dropwise, drop it in 1 hour, then raise the temperature to 65°C, and keep warm for 2 Hour, obtain the prepolymer of terminal NCO, add 70g methyl ethyl ketone and carry out diluting cooling during this period; 11g hydroxypropyl methacrylate and 4.5g methyl ethyl ketone oxime and 2g cyclohexanone oxime that are dissolved in 20g methyl ethyl ketone are slowly added to In the NCO-terminated prepolymer, after reacting at 60°C for 1.5 hours, lower the temperature to 40°C, add 6.5g of acetic acid for quaternization, then slowly add 740g of deionized water for emulsification, and finally extract the methyl ethyl k...

Embodiment 3

[0038] Dehydrate 156g of polypropylene glycol at 120°C under high temperature and vacuum conditions, then lower it to 70°C, slowly add 125g of diphenylmethane diisocyanate, react at 85-90°C for 1 hour, add 7g of ethylene glycol, 85- React at 90°C for 1 hour; then lower the temperature to 50°C, slowly add a mixture of 20g of butanone and 16.1g of tert-butyldiethanolamine dropwise, drop the mixture in 1 hour, then raise the temperature to 65°C, and keep it warm for 2 hours to obtain the NCO-terminated precursor Add 80g methyl ethyl ketone to dilute and lower the temperature; slowly add 12g hydroxybutyl acrylate and 9gξ-caprolactam dissolved in 20g methyl ethyl ketone to the NCO-terminated prepolymer, react at 60°C for 1.5 hours, then lower the temperature To 45°C, add 6g of acetic acid for quaternization, then slowly add 685g of deionized water for emulsification, and finally extract the butanone in it to obtain a chemically bonded self-emulsifying PU seed emulsion; the amount of...

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Abstract

The invention discloses a cationic-nonionic water-based polyurethane-polyacrylate composite emulsion and a preparation method thereof. The polyurethane resin has the defects of poor water resistance of the coated film and lower mechanical strength than the acrylic resin; and the polyacrylic resin has the defects of poor resistance to organic solvents, high tendency to sticking at high temperature, high tendency to embrittlement at low temperature and the like. The preparation method comprises the following steps: inoculating hydroxyl-terminated acrylate and a sealant into an NCO-terminated prepolymer, adding acetic acid to perform quaternization, and adding deionized water to perform emulsification, thereby obtaining the chemical-bond-combined self-emulsified PU (polyurethane) seed emulsion; and adding an unsaturated hydrophobic monomer and a molecular weight regulator, adding a proper amount of emulsifier to perform pre-emulsification, and finally, adding an initiator to initiate polymerization, thereby obtaining the stable cationic-nonionic water-based polyurethane-polyacrylate composite emulsion. The preparation method is advanced, and can be used for preparing the copolymerized emulsion which has obvious core-shell characteristics and can achieve forced compatibility and molecular synergy on the molecular level.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a cationic-nonionic water-based polyurethane-polyacrylate composite emulsion and a preparation method thereof. Background technique [0002] Polyurethane (PU) has been widely used in adhesives, coatings and other fields due to its good physical and mechanical properties, excellent cold resistance, elasticity, high gloss and good resistance to organic solvents. However, the water resistance of the polyurethane resin coating film is not good, and its mechanical strength is not as good as that of polyacrylate (PA): polyacrylate has the advantages of high mechanical strength, aging resistance, light resistance, non-yellowing, and good water resistance, but it also has the advantages of resistance to organic solvents. Poor resistance, sticky at high temperature, brittle at low temperature, etc. It can be seen that polyurethane and polyacrylate have certain complementary effects in nature. If ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F2/28C08F2/30C08G18/67C08G18/66C08G18/12C08G18/08C09D151/08D06M15/263
Inventor 宋金星乐翔施洪坤于本成陈八斤陈翔
Owner 传化智联股份有限公司
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