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A kind of heat-resistant high-solid content water-based polyurethane emulsion and its preparation method and application

A technology of water-based polyurethane with high solid content, applied in the field of polyurethane materials, can solve problems such as difficulty and achieve good heat resistance

Inactive Publication Date: 2020-08-18
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In short, although some progress has been made in the preparation technology of high-solid water-based polyurethane and heat-resistant water-based polyurethane at home and abroad, the basis of high-solid water-based polyurethane with good preparation stability and good reproducibility in the synthesis process In fact, it is not easy to ensure that waterborne polyurethane has various excellent physical and mechanical properties in applications, especially heat resistance, and there is still a lot of work to be done

Method used

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  • A kind of heat-resistant high-solid content water-based polyurethane emulsion and its preparation method and application
  • A kind of heat-resistant high-solid content water-based polyurethane emulsion and its preparation method and application
  • A kind of heat-resistant high-solid content water-based polyurethane emulsion and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of prepolymer: Add 80.0 g of PCL with a molecular weight of 2000 into a 500 mL four-necked flask equipped with a stirrer, a thermometer and a condenser tube, heat and melt, then add 35.0 g of IPDI while blowing nitrogen, and heat it at 80 ° C. The reaction was carried out for 130 minutes to obtain a polyurethane prepolymer whose terminal group was -NCO group.

[0037] (2) Dilution and chain extension of the prepolymer: the temperature of the prepolymer obtained in the previous step was lowered to 65°C, and 198.3g butanone was added to reduce the viscosity of the system, then a mixed solution of 6.5g BDO and 15g butanone was added, and 5.1 The mixture of gC4AS and 15g butanone was continued to react at 65° C. for 90 minutes to obtain a polyurethane prepolymer solution.

[0038] (3) Neutralization, emulsification and solvent removal: Cool the prepolymer solution obtained in the previous step to 35°C, add 123mL deionized water with 1.10g NaOH dissolved in i...

Embodiment 2

[0040] (1) Preparation of prepolymer: Add 50.0g of PBA and 25.0g of PPG with a molecular weight of 2000 into a 500mL four-necked flask equipped with a stirrer, a thermometer and a condenser tube, heat and melt, and then add IPDI while flowing nitrogen. 37.0 g was reacted at 85° C. for 120 min to obtain a polyurethane prepolymer whose end group is -NCO group.

[0041] (2) Dilution and chain extension of the prepolymer: the temperature of the prepolymer obtained in the previous step was lowered to 55°C, and 221.4g of butanone was added to reduce the viscosity of the system, then a mixed solution of 7.2g of BDO and 15g of butanone was added, and 6.6 The mixture of gC4AS and 15g butanone was continued to react at 65°C for 120min to prepare a polyurethane prepolymer solution.

[0042] (3) Neutralization, emulsification and solvent removal: Cool the prepolymer solution obtained in the previous step to 30°C, add 121mL deionized water with 1.42g NaOH dissolved in it, Next, neutralize...

Embodiment 3

[0044] (1) Preparation of prepolymer: Add 42.0g of PCDL and 28.0g of PTMG with a molecular weight of 2000 into a 500mL four-necked flask equipped with a stirrer, a thermometer and a condenser tube, heat and melt, and then add 40.0 g IPDI, reacted at 75°C for 150min to prepare a polyurethane prepolymer whose end group is -NCO group.

[0045] (2) Dilution and chain extension of the prepolymer: the temperature of the prepolymer obtained in the previous step was lowered to 60°C, and 173.5g butanone was added to reduce the viscosity of the system, then a mixed solution of 8.8g BDO and 15g butanone was added, and 4.5 The mixture of gC4AS and 15g butanone was continued to react at 65°C for 60min to prepare a polyurethane prepolymer solution.

[0046] (3) Neutralization, emulsification and solvent removal: Cool the prepolymer solution obtained in the previous step to 40°C, add 120mL of deionized water with 0.97g NaOH dissolved in it, Next, neutralize and emulsify for 20 minutes. Fin...

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Abstract

The invention belongs to the technical field of polyurethane material, and discloses a heat-resistant high-solid-content waterborne polyurethane emulsion, and a preparation method and applications thereof. The preparation method comprises following steps: a polymer polyol is reacted with polyisocyanate so as to obtain a polyurethane performed polymer with -NCO terminal groups; a small molecular chain extender and a sulfonyl calixarene hydrophilic chain extender are added in the presence of an organic solvent, and reaction is carried out so as to obtain a polyurethane performed polymer solution; the polyurethane performed polymer solution is subjected to neutralization and emulsification, the organic solvent is removed so as to obtain the heat-resistant high-solid-content waterborne polyurethane emulsion. According to the preparation method, the sulfonyl calixarene compound is taken as a hydrophilic chain extender, so that the heat resistance and the solid content of the obtained heat-resistant high-solid-content waterborne polyurethane emulsion, and the heat-resistant high-solid-content waterborne polyurethane emulsion can be applied in fields such as coating, adhesive, or printing ink.

Description

technical field [0001] The invention belongs to the technical field of polyurethane materials, and in particular relates to a heat-resistant high-solid-content aqueous polyurethane emulsion and a preparation method and application thereof. Background technique [0002] Polyurethane is a kind of polymer material with excellent performance, which is widely used in fine chemicals such as coatings, adhesives and inks. With the development of science and technology and the continuous enhancement of human environmental protection awareness, the environmental protection regulations of various countries are becoming increasingly stringent, and the emission of volatile organic compounds (VOC) in traditional solvent-based polyurethanes is subject to more and more restrictions. Therefore, water-based polyurethane materials are increasingly valued. , and the application is becoming more and more extensive. Now, in many fields such as leather finishing, fiber treatment and fabric coatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/32C08G18/66C08G18/40C08G18/48C08G18/42C08G18/44C08G18/10C08G18/12C09J175/06C09J175/08
CPCC08G18/10C08G18/12C08G18/4018C08G18/4238C08G18/4277C08G18/44C08G18/4854C08G18/6607C08G18/664C09J175/06C09J175/08C08G18/3206C08G18/3855
Inventor 夏正斌曹高华张逢君
Owner SOUTH CHINA UNIV OF TECH
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