A kind of organosilicon modified aqueous polyurethane emulsion and preparation method thereof

A water-based polyurethane and silicone technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of water-based polyurethane with poor water resistance, poor stability, and poor solvent resistance, and achieve excellent weather resistance and water resistance. Decreased water resistance and low surface tension effects

Active Publication Date: 2018-04-10
ANHUI SKSHU PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a silicone-modified polyurethane emulsion and a preparation method thereof, which solves technical problems such as poor water resistance, poor solvent resistance and poor stability of water-based polyurethane. The invention uses the intermediate product polyurethane prepolymer as a self- Emulsifier, avoiding the problem of water resistance drop caused by external emulsifier; polysiloxane terminated with hydroxyalkyl group and polyurethane copolymerized, greatly improving the water resistance, mechanical properties, thermal properties, etc. of water-based polyurethane paint film

Method used

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  • A kind of organosilicon modified aqueous polyurethane emulsion and preparation method thereof
  • A kind of organosilicon modified aqueous polyurethane emulsion and preparation method thereof
  • A kind of organosilicon modified aqueous polyurethane emulsion and preparation method thereof

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specific Embodiment approach

[0048] A silicone-modified polyurethane emulsion, characterized in that: it is formulated from the following components in the following parts by weight:

[0049]

[0050] A silicone-modified polyurethane emulsion, characterized in that: the silicone-modified polyurethane emulsion is prepared according to the following steps in sequence:

[0051] 1) Preparation of polyurethane prepolymer:

[0052] Add 24.00-26.00 parts of polyester polyol and 25.36-30.18 parts of isophorone diisocyanate into the reactor, heat to 80-85 ° C under the stirring speed of 300-500 rpm and nitrogen protection, and react until the measured -NCO The content reaches the theoretical value;

[0053] 2) Preparation of organosilicon-modified polyurethane prepolymer:

[0054] Then, keep the above speed and temperature, add 42.00-46.00 parts of diluent to adjust the viscosity of the system, then add 4.00-5.00 parts of hydrophilic chain extender, 1.00-8.00 parts of silicone and 0.04-0.08 parts of dilauric ac...

Embodiment 1

[0060] A silicone-modified water-based polyurethane emulsion, which is formulated by the following components in the following parts by weight ratio:

[0061]

[0062] A kind of preparation of organosilicon modified water-based polyurethane emulsion, it is prepared according to the following steps carried out in order by the raw material of following weight ratio:

[0063] 1) Preparation of polyurethane prepolymer:

[0064] Add 24.00 parts of polyester polyol and 25.36 parts of isophorone diisocyanate into a 500mL four-necked flask equipped with a stirrer, thermometer, and condenser tube, heat to 80°C at a stirring speed of 300rpm and under nitrogen protection, and react to the The measured -NCO content reached the theoretical value (15.33%).

[0065] 2) Preparation of organosilicon-modified polyurethane prepolymer:

[0066] Add 42 parts of diluent to the above reaction system to adjust the viscosity of the system, then add 4 parts of hydrophilic chain extender 2,2-dimeth...

Embodiment 2

[0070] A silicone-modified water-based polyurethane emulsion, which is formulated by the following components in the following parts by weight ratio:

[0071]

[0072] A kind of preparation of organosilicon modified water-based polyurethane emulsion, it is prepared according to the following steps carried out in order by the raw material of following weight ratio:

[0073] 1) Preparation of polyurethane prepolymer:

[0074] Add 26 parts of polyester polyol and 30.18 parts of isophorone diisocyanate into a 500mL four-necked flask equipped with a stirrer, thermometer, and condenser tube, heat to 85°C at a stirring speed of 500rpm and under nitrogen protection, and react to the The measured -NCO content reached the theoretical value (16.41%).

[0075] 2) Silicone modified polyurethane prepolymer:

[0076] Add 46 parts of diluent to the reaction system to adjust the viscosity of the system, then add 5 parts of hydrophilic chain extender 2,2-dimethylolpropionic acid (DMPA), 3 ...

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Abstract

The invention relates to an organosilicon modified waterborne polyurethane emulsion and a preparation method thereof. The organosilicon modified waterborne polyurethane emulsion is prepared from the following components: polyester polyol, isophorone diisocyanate, a diluent, a hydrophilic chain extender, bis(hydroxypropyl)-terminiated polysiloxane, dihydric alcohol, dibutyltin dilaurate, a neutralizer, water and ethylene diamine. The invention has the following advantages: the problem of deterioration of water resistance caused by addition of an emulsifier is overcome; and copolymerization of hydroxyalkyl-terminiated polysiloxane and polyurethane substantially improves water resistance, mechanical properties, thermal behaviors and the like of a waterborne polyurethane film.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to an organosilicon-modified polyurethane emulsion and a preparation method thereof. Background technique [0002] With the increasing awareness of environmental protection in various countries around the world, some environmental protection laws and regulations have been formulated to limit the emission of volatile organic compounds (VOC) to the atmosphere. High performance and environmental protection have become the development direction of coatings. The synthesis of polyurethane resin has changed from traditional solvent-based to water-based polyurethane. [0003] Waterborne polyurethane has attracted much attention because of its non-toxic, non-flammable, environmentally friendly, low cost, easy to clean, excellent low temperature resistance and hand feeling. However, compared with solvent-based polyurethane, water-based polyurethane has a smaller solid content an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/42C08G18/61C08G18/34C08G18/32C08G18/12C08G77/16C09D175/06
CPCC08G18/0823C08G18/12C08G18/4009C08G18/42C08G18/61C08G18/6541C08G18/6659C08G18/755C08G77/16C09D175/06C08G18/3228
Inventor 洪杰王艳林伟
Owner ANHUI SKSHU PAINT CO LTD
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