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Aug 6, 2024
The method of cold mixing is mechanical mixing, which requires a higher phenyl content of organosilicon. It can produce a certain degree of condensation reaction during baking, heating or use to form a more uniform paint film. If the phenyl monomer contains a large amount of organosilicon monomer, it can be cold mixed with phenolic cheese, amino, alcohol acid, epoxy, polyester and other resins, resulting in modified organosilicon resin with improved adhesion and mechanical strength, and lower price.
When combined with alkyd resin (dosage 1:1~1:3), it can reduce brittleness, improve adhesion and solvent resistance, but correspondingly reduce high temperature resistance. Suitable for surfaces between 150-260 ℃. It can also be combined with phenolic resin, polyacrylic acid resin, nitrocellulose, and ethyl fiber to make self drying paint.
Although the cold mixing method is relatively simple, the paint film structure is not uniform enough, which cannot fully utilize the excellent properties of the two resins. The organic silicon heat-resistant paint made by this method can be dried at room temperature, which is convenient for large-area application. However, this drying method actually belongs to the "false drying" property. At higher temperatures, the paint film will become soft and sticky, so it should be cured by the coated part being in a high temperature state during use.
This paint is diluted with a mixture of butyl acetate, ethylene glycol acetate ester, and xylene solvent and sprayed onto the steel surface after sandblasting and rust removal. The surface is dried within 2 hours at 18-25 ℃ (room temperature). After the paint film is fully cured during use, its heat resistance is: at 300 ℃, it can withstand heat for 500 hours, the paint film is intact, without cracks or loss of gloss; At 400 ℃, heat-resistant for 100 hours, the paint film is intact, without cracks or loss of gloss. But the heat resistance of the mortar colored paint at 400 ℃ is only 50 hours.
Alkaline pigments such as zinc oxide cannot be used in the above formula, as the acid value of the poly (methyl methacrylate) resin solution is high, and adding alkaline pigments can easily cause the enamel to thicken and form a gel.
Due to the slightly poor adhesion and mechanical strength of pure silicone coatings, they generally need to be modified before use. The chemical modification method is achieved by copolymerizing organic silicon oligomers (silicon intermediates) containing hydroxyl groups (usually methoxy or ethoxy) or light groups with organic resins containing active functional groups such as - OH, - OC2Hs, - OC pressure, etc. through chemical reactions. The copolymer prepared by this method not only has reduced heat resistance, but also has significantly improved curing, solvent resistance, and mechanical strength compared to pure organosilicon; Its structure is more regular, uniform, transparent, non layered, with better color retention, adhesion, and flexibility than cold mixed types, and can exhibit better paint performance.
To carry out a co polymerization reaction, a catalyst needs to be added. The catalyst dehydrates and condenses the intermolecular groups of silanol, causing low molecular weight rings to crack and high molecular weight rearrangement to cause chain growth. Catalysts are generally alkali metals that can cause chain growth and rearrangement in complex structures.
Organic silicon ceramic paint (drying type) is a heat-resistant and corrosion-resistant enamel paint composed of organic silicon modified epoxy resin as the base material, amino resin as the crosslinking agent, heat-resistant pigments and low melting point ceramic powder. It comes in silver, green, mortar color, iron red and other colors, with a heat-resistant temperature of up to 900 ℃. The reason why this paint can withstand such high temperatures and has good protective performance is also based on the same principle as organic silicon aluminum powder coating. At high temperatures, all organic groups in the coating components are oxidized and cracked by heat, and the remaining SiO2 components, pigments and low melting point ceramic powder fuse together, transforming into a more heat-resistant and protective ceramic coating.
Our main products are Silicone Resin Adhesive,Silicone Resin of mica plate,Silicone Resin for transformer coils,Silicone Resin Emulsion,Silicone Resin Intermediate,Silicone Resin for Coating,silicone coating resin,Silicone Resin Paint,Silicone Modified Acrylic Resin.