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CN-121293876-B - Weather-resistant polysiloxane silicone rubber glass decorative protective coating and preparation method thereof

CN121293876BCN 121293876 BCN121293876 BCN 121293876BCN-121293876-B

Abstract

The invention discloses a weather-resistant polysiloxane silicone rubber glass decorative protective coating and a preparation method thereof, and relates to the technical field of protective coatings. The modified cellulose nano-crystalline material comprises 83-100 parts of epoxy polysiloxane solution, 1.8-2.2 parts of cerium 2-ethylhexanoate, 8-9.5 parts of AG-80 epoxy resin, 36-43 parts of curing agent and 2-4 parts of modified cellulose nano-crystalline material, wherein the modified cellulose nano-crystalline material is prepared from cellulose nano-crystalline material, heptadecafluorodecyl trimethoxysilane and MXene quantum dots. The hard compact coating formed by mixing the components of the epoxy polysiloxane solution, AG-80 epoxy resin, the curing agent and the like effectively improves the hardness and the salt fog resistance, and the introduction of the modified cellulose nanocrystals and the cerium 2-ethylhexanoate further improves the adhesive force, the protection property and the weather resistance. Therefore, the invention has wider application prospect.

Inventors

  • ZHANG JUMING
  • SONG JIANG
  • SONG JIANGHUA
  • CHENG HONGWEI
  • YANG JING
  • WANG ZHEN
  • ZHANG YOUMING

Assignees

  • 浙江凌志新材料有限公司

Dates

Publication Date
20260508
Application Date
20251113

Claims (7)

  1. 1. The weather-proof polysiloxane silicone rubber glass decorative protective coating is characterized by comprising the following raw materials, by mass, 83-100 parts of epoxy polysiloxane solution, 1.8-2.2 parts of 2-cerium ethylhexanoate, 8-9.5 parts of AG-80 epoxy resin, 36-43 parts of curing agent and 2-4 parts of modified cellulose nanocrystals; the preparation method of the epoxy polysiloxane solution comprises the following steps: Adding anhydrous potassium carbonate into deionized water and stirring for 10-30min, then adding tetrahydrofuran and stirring for 20-30min, then adding a silane coupling agent KH-560 under the nitrogen atmosphere and reacting for 36-40h, adding dichloromethane and stirring for 20-30min after removing tetrahydrofuran by rotary evaporation, finally adding anhydrous magnesium sulfate and stirring for 24-30h, and filtering to remove precipitate to obtain an epoxy polysiloxane solution; the preparation method of the curing agent comprises the following steps: A1, adding diphenyl chlorophosphate into dichloromethane, and stirring for 30-60min to obtain diphenyl chlorophosphate solution; A2, adding diethylenetriamine and triethylamine into dichloromethane, stirring for 20-60min, then dripping diphenyl chlorophosphate solution into the dichloromethane under the nitrogen atmosphere at the temperature of 0-5 ℃ for reaction for 10-15h, filtering, and removing the dichloromethane and the triethylamine by rotary evaporation to obtain a curing agent; The preparation method of the modified cellulose nanocrystals comprises the following steps: B1, adding cellulose nanocrystals into deionized water, performing ultrasonic dispersion, and then adjusting the pH to 4.5-5.0 to obtain a cellulose nanocrystal suspension; Adding deionized water into absolute ethyl alcohol and stirring for 10-30min, then dropwise adding heptadecafluorodecyl trimethoxysilane while stirring, adjusting the pH to 4.0-4.5, stirring for 40-60min under the atmosphere of nitrogen at 40-45 ℃, adding MXene quantum dots after cooling, and performing ultrasonic dispersion to obtain mixed hydrolysate; And B3, dripping the mixed hydrolysate into the cellulose nanocrystal suspension, stirring for 10-30min, regulating the pH to 8.0-8.5, stirring and refluxing for 10-15h under the nitrogen atmosphere at 58-62 ℃, centrifugally separating, washing the precipitate, adding into absolute ethyl alcohol, performing ultrasonic dispersion, and drying to obtain the modified cellulose nanocrystal.
  2. 2. The weather-resistant polysiloxane-silicone rubber glass decorative protective coating according to claim 1, wherein the mass ratio of deionized water, anhydrous potassium carbonate, tetrahydrofuran, a silane coupling agent KH-560, methylene chloride and anhydrous magnesium sulfate in the preparation process of the epoxy polysiloxane solution is 30-50:0.25-0.37:222-310:118-177:66-99:60-100.
  3. 3. The weather-resistant polysiloxane silicone rubber glass decorative protective paint according to claim 1, wherein the mass ratio of dichloromethane to diphenyl chlorophosphate in A1 is 66-99:26-39; The methylene dichloride, diethylenetriamine, triethylamine and diphenyl chlorophosphate solution 331-463:10-15:10-15:92-138 are described in A2.
  4. 4. The weather-resistant polysiloxane-silicone rubber glass decorative protective paint according to claim 1, wherein the mass ratio of deionized water to cellulose nanocrystals in B1 is 100-150:2-3.
  5. 5. The weather-resistant polysiloxane-silicone rubber glass decorative protective paint according to claim 1, wherein the dosage of the absolute ethyl alcohol, the deionized water, the heptadecafluorodecyl trimethoxysilane and the MXene quantum dots in the B2 is 20-30mL:5-7mL:2-3mL:0.1-0.15g.
  6. 6. The weatherable polysiloxane silicone rubber glass decorative protective coating according to claim 1, wherein the volume ratio of the mixed hydrolysate, the cellulose nanocrystal suspension, and the absolute ethanol in B3 is 27-40:100-150:5-10.
  7. 7. A method for preparing the weather-resistant polysiloxane silicone rubber glass decorative protective paint according to any one of claims 1 to 6, comprising the following steps: Adding cerium 2-ethylhexanoate and AG-80 epoxy resin into the epoxy polysiloxane solution, stirring for 20-30min at 65-70 ℃, then adding a curing agent and modified cellulose nanocrystals, and stirring for 30-60min at 65-70 ℃ to obtain the weather-resistant polysiloxane silicone rubber glass decorative protective coating.

Description

Weather-resistant polysiloxane silicone rubber glass decorative protective coating and preparation method thereof Technical Field The invention relates to the technical field of protective coatings, in particular to a weather-resistant polysiloxane silicone rubber glass decorative protective coating and a preparation method thereof. Background The protective coating for silicon rubber glass is a coating material prepared by taking elastic polymer with siloxane as a framework as a base material, adding functional filler, curing agent and the like, and forming a transparent, flexible and protective film on the surface of glass through a crosslinking reaction. As a novel coating material, the coating material has excellent protection capability and good high and low temperature resistance, and is widely applied because the coating material can meet the diversified requirements of different application scenes. However, in practical application, the silicone rubber glass protective coating still has the problems of low hardness, poor adhesive force, easy scratch or falling off in daily cleaning, and damage to an antifouling and hydrophobic functional layer, and the problems of poor salt spray resistance and ultraviolet aging resistance, easy foaming, easy yellowing and easy pulverization after long-time rain wash or sun exposure. Therefore, the anti-discoloration capability, adhesive force, protection performance, weather resistance and construction simplicity of the existing silicone rubber glass protective coating are still to be improved. Disclosure of Invention The invention aims to provide a weather-resistant polysiloxane silicone rubber glass decorative protective coating and a preparation method thereof, which solve the following technical problems: The existing silicone rubber glass protective paint still has the problems of easy color change, poor adhesive force, high construction requirement, poor protection performance and relatively poor weather resistance. The aim of the invention can be achieved by the following technical scheme: The weather-proof polysiloxane-silicone rubber glass decorative protective paint comprises 83-100 parts of epoxy polysiloxane solution, 1.8-2.2 parts of 2-cerium ethylhexanoate, 8-9.5 parts of AG-80 epoxy resin, 36-43 parts of curing agent and 2-4 parts of modified cellulose nanocrystals; The modified cellulose nanocrystals are prepared from cellulose nanocrystals, heptadecafluorodecyl trimethoxy silane and MXene quantum dots. Preferably, the preparation method of the epoxy polysiloxane solution comprises the following steps: adding anhydrous potassium carbonate into deionized water and stirring for 10-30min, adding tetrahydrofuran and stirring for 20-30min, adding a silane coupling agent KH-560 under nitrogen atmosphere, reacting for 36-40h, steaming off tetrahydrofuran at 68-75 ℃ in a rotating way, adding dichloromethane and stirring for 20-30min, finally adding anhydrous magnesium sulfate and stirring for 24-30h, and filtering to remove precipitate to obtain the epoxy polysiloxane solution. Preferably, the mass ratio of deionized water, anhydrous potassium carbonate, tetrahydrofuran, silane coupling agent KH-560, methylene dichloride and anhydrous magnesium sulfate is 30-50:0.25-0.37:222-310:118-177:66-99:60-100. Preferably, the preparation method of the curing agent comprises the following steps: A1, adding diphenyl chlorophosphate into dichloromethane, and stirring for 30-60min to obtain diphenyl chlorophosphate solution; A2, adding diethylenetriamine and triethylamine into dichloromethane, stirring for 20-60min, then dripping diphenyl chlorophosphate solution into the dichloromethane under the nitrogen atmosphere at the temperature of 0-5 ℃ for reaction for 10-15h, filtering, and removing the dichloromethane and the triethylamine by rotary evaporation at the temperature of 90-95 ℃ to obtain the curing agent. Preferably, the mass ratio of the dichloromethane to the diphenyl chlorophosphate in the A1 is 66-99:26-39; The methylene dichloride, diethylenetriamine, triethylamine and diphenyl chlorophosphate solution 331-463:10-15:10-15:92-138 are described in A2. Preferably, the preparation method of the modified cellulose nanocrystals comprises the following steps: b1, adding cellulose nanocrystals into deionized water, performing ultrasonic dispersion with power of 200-300W and frequency of 30-40kHz for 30-60min, and then adjusting pH to 4.5-5.0 by using 1mol/L acetic acid solution to obtain cellulose nanocrystal suspension; Adding deionized water into absolute ethyl alcohol and stirring for 10-30min, then dropwise adding heptadecafluorodecyl trimethoxy silane while stirring, regulating the pH to 4.0-4.5 by using 1mol/L acetic acid, stirring for 40-60min under the atmosphere of 40-45 ℃ and nitrogen, cooling to 20-30 ℃, adding MXene quantum dots, and performing ultrasonic dispersion with the power of 200-300W and the frequency of 30-40kHz for 15-30min to obtain mixed hydr