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Waterborne polyurethane emulsion with high stretch intensity and preparation method thereof

A technology of water-based polyurethane and high tensile strength, applied in the field of coatings, can solve the problems of poor physical properties, reduce the stability of emulsions, and cannot adapt to the working environment with high physical performance requirements, and achieve good physical properties and high tensile strength. Effect

Inactive Publication Date: 2019-01-25
CHANGCHUN UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, the application of water-based polyurethane is also accompanied by disadvantages such as poor physical properties. In the past production, the ratio of isocyanate group to hydroxyl group (R value) in the system was increased to increase the proportion of hard segments in water-based polyurethane to improve the physical properties of the film. performance, but it also reduces the stability of the emulsion, causing great inconvenience to the storage and transportation of the emulsion
[0003] CN106750126A discloses a preparation method of water-based polyurethane without co-solvent, by dissolving hydrophilic chain extender in aliphatic aliphatic glycol, and carrying out water-phase chain extension by ethylenediamine to avoid the use of organic solvents, However, the maximum tensile strength of the film made from the obtained emulsion is 32.77MPa, which cannot be adapted to some operating environments with high physical performance requirements.

Method used

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  • Waterborne polyurethane emulsion with high stretch intensity and preparation method thereof
  • Waterborne polyurethane emulsion with high stretch intensity and preparation method thereof

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preparation example Construction

[0035] The present invention also provides a kind of preparation method with the aqueous polyurethane emulsion of high tensile strength, comprises as follows:

[0036] Step 1: Add polyether polyol, isocyanate monomer, hydrophilic chain extender and catalyst into a four-neck flask, and react at 70-90°C for 2-3 hours to obtain a prepolymer;

[0037] Step 2: quickly cool down the system to 30-50° C., add a salt-forming agent to react for 10-20 minutes, then add ethylenediamine and deionized water and stir at high speed for 1-2 hours to obtain an aqueous polyurethane emulsion.

[0038] According to the present invention, first add polyether polyol into the four-necked flask, preferably vacuum dehydrate at 80-120°C for 1-2h, then add isocyanate monomer, hydrophilic chain extender and catalyst, and gradually heat up to 70-90°C ℃ reaction 2 ~ 3h. The catalyst is preferably selected from one or more of stannous octoate, dibutyltin dilaurate, triethanolamine or dimethylethanolamine. ...

Embodiment 1

[0042] Add 40g of polytetrahydrofuran diol (number average molecular weight: 2000) into a four-necked flask equipped with a stirring device, a condensing device, a thermometer and protected by nitrogen gas, dehydrate in vacuum at 90°C for 2 hours, and then add isophorone 20g of diisocyanate, 4.5g of hydrophilic chain extender dimethylolpropionic acid and 0.1g of catalyst dibutyltin dilaurate were reacted for 130min to obtain a prepolymer;

[0043] Cool the system down to 30°C quickly, add 50ml of acetone to reduce the viscosity, wait until the -NCO value of the system reaches the theoretical value, add 2.9g of salt-forming agent triethylamine, continue the reaction for 10min, then add 2.5g of ethylenediamine and deionized water, Adjust the rotation speed of the stirring device to 1000 rad / min, and emulsify at room temperature for 1.5 h to obtain a water-based polyurethane emulsion.

[0044] figure 1 The infrared spectrogram of the film made by a kind of water-based polyuretha...

Embodiment 2

[0047]In a four-necked flask equipped with a stirring device, a condensing device, a thermometer and protected by nitrogen gas, add 35 g of polytetrahydrofuran diol (number average molecular weight: 2000), dehydrate under vacuum at 90 ° C for 1.5 h, and then add isophor Ketone diisocyanate 25g, hydrophilic chain extender dimethylolpropionic acid 4.5g and catalyst dibutyltin dilaurate 0.1g, reacted for 130min to obtain a prepolymer;

[0048] Cool the system down to 30°C quickly, add 50ml of acetone to reduce the viscosity, and when the -NCO value of the system reaches the theoretical value, add 2.9g of salt-forming agent triethylamine, continue the reaction for 10min, then add 2.0g of ethylenediamine and deionized water, Adjust the rotation speed of the stirring device to 1000 rad / min, and emulsify at room temperature for 1 hour to obtain a water-based polyurethane emulsion.

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Abstract

The invention discloses a waterborne polyurethane emulsion with high stretch intensity and a preparation method thereof, and belongs to the technical field of paint. The waterborne polyurethane emulsion is prepared from the following raw materials in parts by weight: 30 to 90 parts of polyether polyol, 20 to 60 parts of polyisocyanate monomers, 3 to 13 parts of hydrophilic chain-extending agents,2 to 7 parts of salt-forming agents and 2 to 5 parts of quadrol. The invention also discloses a preparation method of the waterborne polyurethane emulsion with high stretch intensity. The method has the advantages that the polyether polyol, polyisocyanate monomers and hydrophilic chain-extending agents are gradually polymerized according to a certain proportion; under the chain expansion effect ofamine chain extenders, the anionic waterborne polyurethane emulsion is synthesized by a self-emulsification method. After the coating deformation film forming by the waterborne polyurethane emulsionwith high stretch intensity, the fracture intensity is higher than or equal to 45 MPa; the stretch resistance performance is good.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a water-based polyurethane emulsion with high tensile strength and a preparation method thereof. Background technique [0002] With the advancement of science and technology and the enhancement of people's awareness of environmental protection, the application of water-based polyurethane has gradually expanded from finishing agents to coatings, adhesives and other fields. Its excellent water resistance, weather resistance, flame resistance and chemical corrosion resistance. It has become a key topic in the research of water-based resin. However, the application of water-based polyurethane is also accompanied by disadvantages such as poor physical properties. In the past production, the ratio of isocyanate group to hydroxyl group (R value) in the system was increased to increase the proportion of hard segments in water-based polyurethane to improve the physical properties of the ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/34C08G18/32C09D175/08
CPCC08G18/4854C08G18/6685C08G18/6692C09D175/08
Inventor 周超单久航
Owner CHANGCHUN UNIV OF TECH
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