A kind of preparation method of silicone resin microemulsion

Abstract

The invention relates to the field of water-based silicone resin, in particular to a method for preparing a silicone resin microemulsion. The invention combines vinyl silicone resin with chemical formula HS(CH 2 ) n The mercapto-containing carboxylic acid of COOH (n=2~6) reacts under photoinitiator and ultraviolet light irradiation to obtain carboxyl-modified silicone resin, then add alkaline water, vigorously stir and neutralize to obtain translucent silicone resin micro lotion. The silicone resin microemulsion has good stability and can be applied to the field of water-based finishing agent or water-based paint.

Description

technical field

[0001] The invention relates to the field of silicone resins, in particular to a method for preparing silicone resin microemulsions. Background technique

[0002] Water-based materials refer to materials that use water as a diluent to dissolve or disperse the medium in water. Water-based materials, especially water-based coatings, have the advantages of low VOC (volatile organic compounds), non-toxic and environmentally friendly, non-flammable and non-explosive, and are more and more popular in the market as people's awareness of environmental protection becomes higher and higher. The country is also paying more and more attention to environmental protection issues, and the control of solvent-based materials is becoming more and more stringent. Therefore, water-based materials and their application in water-based products are issues that need to be paid more and more attention, and have become a development direction in the field of materials.

[0003] Sili...

Examples

Embodiment 1

[0026] In terms of parts by mass, add 100 parts of vinyl MQ silicone resin with a viscosity of 2000mPa.s and a vinyl content of 10wt%, 35.4 parts of 3-mercaptopropionic acid and 2.7 parts of benzoin bimethacin in a container equipped with a thermometer and a stirring rod Ether, at room temperature, irradiated with ultraviolet light with a main wavelength of 365nm and an intensity of 120W / cm for 8 minutes, raised the temperature to 70°C, added 140 parts of triethanolamine solution with a concentration of 36wt% under vigorous stirring, and continued to stir vigorously for half an hour to obtain a solid containing About 50 wt% of the translucent silicone resin microemulsion has a pH value of 7.2 as measured by a pH meter.

Embodiment 2

[0028] In terms of parts by mass, add 100 parts of vinyl phenyl silicone resin with a viscosity of 100mPa.s and a vinyl content of 1wt%, 4.45 parts of 4-mercaptobutyric acid and 5.2 parts of benzoin bis Methyl ether is irradiated with ultraviolet light with a main wavelength of 365nm and an intensity of 120W / cm for 5 minutes, and the temperature is raised to 80°C, and 105 parts of triethanolamine solution with a concentration of 5.5wt% is added under vigorous stirring, and the vigorous stirring is continued for half an hour to obtain a solid content of about The pH value of the 50 wt% translucent silicone resin microemulsion is 7.1 as measured by a pH meter.

Embodiment 3

[0030] In terms of parts by mass, add 100 parts of vinyl fluorine-containing silicone resin with a viscosity of 500mPa.s and a vinyl content of 4wt%, 20.9 parts of 6-mercaptocaproic acid and 3.6 parts of benzoin cloves in a container equipped with a thermometer and a stirring rod Ether, irradiated with ultraviolet light with a main wavelength of 365nm and an intensity of 80W / cm for 3 minutes, raised the temperature to 80°C, added 120 parts of diethanolamine solution with a concentration of 12.5wt% under vigorous stirring, and continued to stir vigorously for half an hour to obtain a solid content of about 50wt % translucent silicone resin microemulsion, the pH value measured by a pH meter is 7.1.

technical field

[0001] The invention relates to the field of silicone resins, in particular to a method for preparing silicone resin microemulsions. Background technique

[0002] Water-based materials refer to materials that use water as a diluent to dissolve or disperse the medium in water. Water-based materials, especially water-based coatings, have the advantages of low VOC (volatile organic compounds), non-toxic and environmentally friendly, non-flammable and non-explosive, and are more and more popular in the market as people's awareness of environmental protection becomes higher and higher. The country is also paying more and more attention to environmental protection issues, and the control of solvent-based materials is becoming more and more stringent. Therefore, water-based materials and their application in water-based products are issues that need to be paid more and more attention, and have become a development direction in the field of materials.

[0003] Sili...

Examples

Embodiment 1

[0026] In terms of parts by mass, add 100 parts of vinyl MQ silicone resin with a viscosity of 2000mPa.s and a vinyl content of 10wt%, 35.4 parts of 3-mercaptopropionic acid and 2.7 parts of benzoin bimethacin in a container equipped with a thermometer and a stirring rod Ether, at room temperature, irradiated with ultraviolet light with a main wavelength of 365nm and an intensity of 120W / cm for 8 minutes, raised the temperature to 70°C, added 140 parts of triethanolamine solution with a concentration of 36wt% under vigorous stirring, and continued to stir vigorously for half an hour to obtain a solid containing About 50 wt% of the translucent silicone resin microemulsion has a pH value of 7.2 as measured by a pH meter.

Embodiment 2

[0028] In terms of parts by mass, add 100 parts of vinyl phenyl silicone resin with a viscosity of 100mPa.s and a vinyl content of 1wt%, 4.45 parts of 4-mercaptobutyric acid and 5.2 parts of benzoin bis Methyl ether is irradiated with ultraviolet light with a main wavelength of 365nm and an intensity of 120W / cm for 5 minutes, and the temperature is raised to 80°C, and 105 parts of triethanolamine solution with a concentration of 5.5wt% is added under vigorous stirring, and the vigorous stirring is continued for half an hour to obtain a solid content of about The pH value of the 50 wt% translucent silicone resin microemulsion is 7.1 as measured by a pH meter.

Embodiment 3

[0030] In terms of parts by mass, add 100 parts of vinyl fluorine-containing silicone resin with a viscosity of 500mPa.s and a vinyl content of 4wt%, 20.9 parts of 6-mercaptocaproic acid and 3.6 parts of benzoin cloves in a container equipped with a thermometer and a stirring rod Ether, irradiated with ultraviolet light with a main wavelength of 365nm and an intensity of 80W / cm for 3 minutes, raised the temperature to 80°C, added 120 parts of diethanolamine solution with a concentration of 12.5wt% under vigorous stirring, and continued to stir vigorously for half an hour to obtain a solid content of about 50wt % translucent silicone resin microemulsion, the pH value measured by a pH meter is 7.1.

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