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Impregnating Paint for Organosilicon Glass Cloth Laminates

Jul 15, 2024

Organosilicon glass cloth laminates are widely used as insulation for H-class motors, including slot beams, wiring boards, instrument panels, insulation boards, radar antenna covers, transformer sleeves, high-frequency and waveguide engineering, and microwave baffles for microwave cookware. They can also be used as other heat-resistant insulation materials.

The production of glass cloth laminates mainly uses low R/Si value (1.0~1.2) methylphenyl silicone resin as the adhesive. To manufacture glass cloth laminates, the manufacturing process is as follows: first, immerse a layer of silicone paint solution containing a curing agent on the glass cloth that has undergone desizing and alkali removal. After extraction, dry it on its own in a circulating air flow for 30 minutes, evaporate the solvent at a temperature of about 100 ℃ and pre cure for 5 minutes. After cooling, perform a one-step heat treatment of the pre impregnated paint to improve its mechanical properties and solvent resistance.To prevent interlayer delamination during the post curing process, it is necessary to first maintain it at 90-120 ℃ for a period of time, and then slowly heat it up to 250 ℃ for 12-24 hours or longer.

Low temperature or room temperature cured silicone paint
Usually, pure organic silicon impregnating paint requires heating to 150-250 ℃ and a long time (10-15 hours) to fully cure. Due to the high curing temperature, its range of use is often limited. Long term baking causes oxidation of organic groups and breakage of Si-C bonds, which makes the use of impregnating paint difficult. In order to reduce the curing temperature of silicone impregnating paint, various countries have successfully developed low-temperature drying paints.

The production method of low-temperature drying paint is to use organic silicone resin with low R/Si and high methyl content in the preparation of resin for CD, in order to achieve the performance of low-temperature drying. However, this inevitably reduces the heat resistance and elasticity of the coating Choose a curing agent to cure S at a low temperature of 100-150 ℃! - The OH bond undergoes condensation or ring opening polymerization in the inner ring, achieving complete drying in a short period of time at 100-150 ℃, without affecting the electrical performance and heat resistance of this catalyst.

The most important catalysts include soluble salts of lead, iron, diamond, lead, tin, quinone, as well as amines and quaternary amine bases. Cyanates or octanoates of metals such as drills, picks, lead, zinc, etc. are commonly used as drying agents, with an addition amount of 0.1% to 0 5% (based on metal concentration) can achieve the goal of reducing curing temperature and shortening curing time. Among these drying agents, zinc octanoate is preferred because it has a light color and has a relatively small impact on the heat resistance and mechanical properties of the paint film.

Using dibutyltin dilaurate or dibutyltin diacetate, the dosage is 0 5% -2%, the silicone paint film can be catalyzed and dried at room temperature. Using organic metal compounds with acyloxy groups as catalysts can catalyze and dry the silicone paint at 80 ℃. However, the service life is short, and the heat resistance and mechanical properties of the paint film are poor. Triacetylacetone aluminum is a relatively good curing agent, with a dosage of 0.5% -0% of the organic silicone resin 75%, the paint film can cure at 80 ℃ and has a shelf life of one month. The dried paint film has good thermal elasticity and excellent moisture-proof insulation performance.

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