An impact-resistant composite material used for powdery paint and modified powdery paint

Abstract

The invention relates to an impact-resistant composite material used for powdery paint. The composite material includes an inorganic filler and a silane modifying agent. The mass of the silane modifying agent added is 10-20% of the total mass of the composite material. The inorganic filler has hydroxy, the particle size D50 is not more than 4 [mu]m, and the particle size D100 is less than 15 [mu]m. The silane modifying agent is a mixture of first silane and second silane in a mass ratio of 1.5-3:1. The first silane is one or more selected from epoxy silane, aminosilane, and vinyl silane, and the second silane is an alkyl oligomer. Through improving the formula and a preparing method of the composite material, impact resistance of the powdery paint is increased to 80 kg.cm or above, pencilhardness of the powdery paint is increased to 2 H, the leveling degree of the powdery paint is not less than 4, and adhesive force of the powdery paint is 0.

Description

technical field [0001] The invention belongs to the field of paint materials, and relates to an impact-resistant composite material for powder paint and a modified powder paint. Background technique [0002] Powder coatings usually use barium sulfate as the main filler in the powder coating formula, which can improve the hardness and fullness of the paint film in the coating. However, because the barium sulfate material itself has a Mohs hardness of 3.5 and no hydroxyl groups on the surface, it is compatible with the resin. The binding force is very poor, so that the impact force is less than 30kg.cm, and the hardness is less than 1H. However, the current market puts forward higher requirements on the impact performance of powder coatings, that is, the impact performance is ≥80kg.cm. At present, there is no powder material developed solely to improve the impact performance on the market. To improve the impact performance of powder coatings can only be achieved by replacing ...

AI Technical Summary

Problems solved by technology

There is a major defect in this preparation process, that is, when it is applied to the existing dark or black paint formulations, white threads will appear on the surface. According to analysis, this is caused by the instability of the silane treatment agent after it is diluted and modified with alcohols. Precipitation

In addition, since the second silane used is a long-chain alkylsilane, although the dispersion can be better improved, the long-chain alkylsilane cannot be well combined with the resin system, and the coating will be damaged when impacted. The impact point breaks and cracks occur, so the mechanical properties are poor, and its impact performance is less than or equal to 50kg.cm, which cannot meet the high requirements of the market

Images