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Waterborne polyurethane-acrylic emulsion as well as preparation method and application thereof

A water-based polyurethane and acrylic emulsion technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of easy phase separation, high cost, poor water resistance of polyurethane, etc., to improve surface properties and film-forming properties Effect

Active Publication Date: 2014-04-23
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the shortcomings of polyurethane itself such as poor water resistance and high cost, its comprehensive performance is not very ideal.
The publication number is CN102408537A, which discloses a preparation method of acrylate-modified polyurethane emulsion for synthetic leather, but it adopts simple blending of polyacrylic acid emulsion and polyurethane emulsion, and it is easy to produce phase separation when forming a film.

Method used

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  • Waterborne polyurethane-acrylic emulsion as well as preparation method and application thereof
  • Waterborne polyurethane-acrylic emulsion as well as preparation method and application thereof
  • Waterborne polyurethane-acrylic emulsion as well as preparation method and application thereof

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preparation example Construction

[0034] The present invention also provides a kind of preparation method of aqueous polyurethane-acrylic acid emulsion, comprises as follows:

[0035] Step 1: Add polyether polyol, polyisocyanate monomer, polysiloxane, hydrophilic chain extender, small molecule chain extender and catalyst into the reaction vessel, and react at 75-85°C for 4-6 hours to obtain prepolymer;

[0036] Step 2: Lower the temperature in the reaction vessel to 55-65°C, then add a part of acrylate monomer, lower the temperature to 30-45°C, add neutralizer, react for 5-10 minutes, add deionized Stir with water to obtain polyurethane emulsion;

[0037] Step 3: adding an initiator, an emulsifier and the remaining acrylic ester monomers into a reaction vessel, and reacting at 70-85° C. for 2-6 hours to obtain a water-based polyurethane-acrylic acid emulsion.

[0038] In step 1 of the present invention, after adding polyether polyol into the reaction vessel, vacuum dehydration is preferably carried out at 11...

Embodiment 1

[0046] Add 100 g of polytetrahydrofuran diol (data molecular weight: 4000) into a three-necked flask equipped with a stirring device, a condenser, and a thermometer, vacuumize and dehydrate at a temperature of 120°C for 1 hour, and then add a hydrophilic chain extender, dimethylol Propionic acid 12g, chain extender 1,4-butanediol 10g, hydroxyl-terminated polydimethylsiloxane (data molecular weight: 2000) 10g and catalyst dibutyltin dilaurate 0.1g, under the protection of dry nitrogen, The temperature is controlled at 85°C, and after the above mixed solution is melted, 80 g of isophorone diisocyanate is added at one time, and reacted for 4 hours until the -NCO value reaches the theoretical value to obtain a prepolymer;

[0047] Lower the temperature in the three-necked flask to 60°C, then add 30g of methyl methacrylate and butyl acrylate mixture for dilution (mass ratio is 1:1), lower the temperature to 40°C, add 4g of triethylamine, react for 5min, Add deionized water at room ...

Embodiment 2

[0052] Add 60g of polyoxyethylene glycol (data molecular weight: 1000) into a three-necked flask equipped with a stirring device, a condenser, and a thermometer, vacuumize and dehydrate at a temperature of 120°C for 1 hour, and then add a hydrophilic chain extender dihydroxy Methylbutyric acid 5g, chain extender neopentyl glycol 5g, hydroxyl-terminated polydimethylsiloxane (data molecular weight: 500) 1g and catalyst dimethylethanolamine 0.01g, under the protection of dry nitrogen, the temperature is controlled at 75°C, after the above mixture is melted, add 40 g of hexacyclohexyl dicyanate at one time, react for 6 hours until the -NCO value reaches the theoretical value, and obtain a prepolymer;

[0053] Lower the temperature in the three-necked flask to 55°C, then add 15g of ethyl methacrylate, lower the temperature to 30°C, add 5g of tripropylamine to neutralize and form a salt, react for 10min, add deionized water at room temperature, Stir and disperse under the rotating s...

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Abstract

The invention provides waterborne polyurethane-acrylic emulsion as well as a preparation method and application thereof, belonging to the field of leather auxiliaries. The emulsion comprises 60-100 parts of polyether polyols, 40-80 parts of polyisocyanate monomers, 1-10 parts of polysiloxane, 30-60 parts of acrylic monomers, 5-10 parts of small molecule chain extenders and 5-12 parts of hydrophilic chain extenders by weight. The invention also provides the preparation method of the waterborne polyurethane-acrylic emulsion. The preparation method comprises the steps of stepwise polymerizing the polyisocyanate monomers, polyether polyols, hydrophilic chain extenders and organic silicon in proportion to prepare a prepolymer, synthesizing anionic waterborne polyurethane emulsion by a self-emulsification method, adding the acrylic monomers and continuing polymerization, thus preparing the dual-modified waterborne polyurethane emulsion. After a film is formed by coating the emulsion, the tensile strength is not less than 20MPa and the elongation is not less than 600%. The waterborne polyurethane-acrylic emulsion has good surface properties and excellent overall properties.

Description

technical field [0001] The invention belongs to the field of leather auxiliary agents, and in particular relates to a water-based polyurethane-acrylic acid emulsion and a preparation method and application thereof. Background technique [0002] Water-soluble polyurethane for leather is an indispensable film-forming substance in the process of leather finishing. The water-based polyurethane finishing agent eliminates the flammable and explosive hazards in the production, storage, transportation and use of solvent-based polyurethane, and meets the requirements of safety and environmental protection. The leather coated with polyurethane emulsion has bright, plump, good hand feeling, wear resistance, and is not easy to wear. Fracture and other advantages can greatly improve the grade of finished leather. However, polyurethane also has its inherent disadvantages, such as poor water resistance, insufficient mechanical properties, and relatively expensive raw materials. The polya...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/74C08G18/73C08G18/67C08G18/66C08G18/61C08G18/48C08G18/32C08G18/12C09D175/08
CPCC09D151/08C08F283/006C08G18/0823C08G18/12C08G18/4009C08G18/4854C08G18/61C08G18/6674C08G18/6692C08G18/755C08F220/18C08F220/14C08F220/1804C08F220/1802
Inventor 周超陈秀梅张凤涛
Owner CHANGCHUN UNIV OF TECH
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