Effect of silicone intermediates and their dosage on the performance of modified resins

The half-life of phenyl and methyl is longer, and their substituted silicone intermediates have good weathering performance. The amount of silicone intermediates is large, weatherability, light retention and anti-powdering properties. Generally choose the dosage of 30%-50% of phenyl or methyl silicone intermediates, less than 30% modified alkyd resin performance changes are not obvious, higher than 50% is too soft film and the cost is too high.

When the higher the silicone content of the modified resin is required, the lower the hydroxysiloxane conversion rate in the co-condensation reaction. When placing the unpurified modified compound, the silicone content of 60% of the formula, less than 3 months storage occurred delamination, which is due to the poor compatibility of the unreacted part of the hydroxysiloxane and generated. In contrast, modified mixtures with 40% or 30% silicone content remained stable even when stored for half a year.

The co-condensation modified resin was made into a varnish with unmodified alkyd resin and cold blend resin, and a test piece was coated. Although the adhesion of the modified varnish (circling method) did not change much, while heat resistance, hardness and impact strength.

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