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    Home > Coatings News > Paints and Coatings Market > Coating technology: formulation and preparation method of modified hydrophobic SiO2 self cleaning coating

    Coating technology: formulation and preparation method of modified hydrophobic SiO2 self cleaning coating

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: self cleaning coating can be used on the surface of substrate (such as glass ceramics or wood stone, etc.), depending on the hydrophobic and hydrophilic physical characteristics of the coating itself, it can play a role of antifouling and easy cleaning The formulation is based on the modified hydrophobic SiO2 self-cleaning coating, which is composed of the following components and their mass percentage: fluorosilicone 25-45%, hydroxy terminated polydimethylsiloxane coated modified nano-sio215-30%, aromatic ester mixed solvent 30-55%, and curing agent The relative mass ratio of the curing agent to the above components is 0.4:100-0 Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint Home News: self cleaning paint can be used on the surface of base materials (such as glass ceramics or wood and stone) Depending on the hydrophobic and hydrophilic physical characteristics of the paint itself, it can play a role of antifouling and easy cleaning The formulation is based on the modified hydrophobic SiO2 self-cleaning coating, which is composed of the following components and their mass percentage: fluorosilicone 25-45%, hydroxy terminated polydimethylsiloxane coated modified nano-sio215-30%, aromatic ester mixed solvent 30-55%, and curing agent The relative mass ratio of the curing agent to the above components is 0.4:100-0.72:100 The hydroxy terminated polydimethylsiloxane coated modified nano-SiO2 is prepared by the following process steps: a) mixing and dispersing the gas-phase SiO2 powder in xylene solution, the concentration range of the powder relative to the solution is 0.01g/ml-0.1g/ml, stirring for 20-60 minutes at a speed of 2500-3000 rpm, and then ultrasonic dispersion for 10-20 minutes until the dispersion is uniform; B) Step a: add the hydroxy terminated polydimethylsiloxane with the viscosity range of 1500-800000 MPa · s into the solution, and the mass ratio of the hydroxy terminated polydimethylsiloxane to the gas phase SiO2 is 1:1-1:10, and mix and stir evenly; C) Step B: add dibutyltin dilaurate as catalyst, the amount of which is 0.1% ~ 1% of the total mass of relative hydroxyl terminated polydimethylsiloxane and gas-phase SiO2, stir, raise the temperature to 60 ℃ ~ 80 ℃, and control the reaction time to 0.5 ~ 8 hours The product is centrifuged and then baked in the oven at 80 ℃ ~ 160 ℃ for 6 ~ 18 hours, that is to say, complete hydroxyl terminated polydimethylsiloxane The preparation of Nano-SiO2 coated with basic siloxane In this formula, the hydroxyl terminated polydimethylsiloxane is used to coat and modify the nano gas phase SiO2 Due to the grafting and coating of hydroxyl terminated polydimethylsiloxane, the content of hydrophilic hydroxyl on the surface of SiO2 particles can be effectively reduced, and the hydrophobicity can be improved At the same time, due to the coating modification of macromolecular polymer, the cluster phenomenon of nano SiO2 particles mixed into the polymer can be inhibited, and the content of nano SiO2 can be increased Dispersing efficiency and promoting hydrophobicity of film surface Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,
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