Preparation method of ablation-resistant heat insulation paint

Abstract

The invention relates to a preparation method of ablation-resistant heat insulation paint, and belongs to the field of heat insulation paint. The heat insulation paint comprises 29 percent to 34 percent of phenol-formaldehyde resin and 66 percent to 72 percent of 22-1 type powder. The preparation method of the heat insulation paint comprises the following steps that absolute ethyl alcohol, 29 percent to 34 percent of phenol-formaldehyde resin and 66 percent to 72 percent of 22-1 type powder are sequentially added into a reaction vessel; after the stirring is carried out for 50 to 60 minutes, a small amount of large-granule powder which is not uniformly dispersed is filtered by a 200-mesh screen mesh; a heat insulation paint solution is obtained, wherein the adding proportion of the absolute ethyl alcohol is 1.3 to 1.6 times of the mass of solid powder. The preparation method is also applicable to two application processes including a roll coating process and a spray coating process; compared with that of a traditional recipe paint coating process, the rejection rate is low; after the curing, the adhesive force and the hardness of a coating are obviously superior to those of the traditional heat insulation coating; the coating is thicker in single-time operation; the production efficiency is high; the multi-time overlay coating can be carried out according to use requirements, and the coating thickness is increased. Wide application prospects are realized in national defense and military industry and civil industry.

Description

technical field [0001] The invention relates to a preparation method of an ablation-resistant heat-insulating coating, which belongs to the field of heat-insulating coatings. Background technique [0002] During the ignition and flight of the rocket, the engine releases a large amount of heat when it is working, and the temperature will reach 2000-2500°C in a short period of time, and its shell is generally made of metal steel or aluminum, and its melting point is much lower than the working temperature. If the working surface of the engine casing is not protected by heat insulation, it may be burned through by high temperature, making the rocket unable to fly normally. [0003] For products with long range and long engine working time, the protective measure is to bond and mold ablation-resistant molding compound on the working surface; for products with short shooting range and short engine working time, the working surface is coated with a certain thickness Ablation-resi...

AI Technical Summary

Problems solved by technology

[0005] Silicone resin-based ablation-resistant and heat-insulating coatings have the advantage of good heat resistance, but the disadvantages are poor mechanical strength and adhesion. When the ambient temperature of the production site is high (≥25°C), the coating surface is prone to foaming, resulting in defects in the appearance of the coating. And because the solid powder is easy to settle, it is not suitable for the spraying process; the advantages of barium phenolic resin and boron phenolic resin ablation-resistant and heat-insulating coatings are good heat resistance, mechanical strength and adhesion, but affected by the composition and structure of the resin, in Cracks are prone to occur in the process of rolling coating with a thick coating at one time, so it is not suitable for rolling coating process