Method for dip-coating metal rubber part by adopting high-temperature resistant organosilicon coating

Abstract

The invention relates to a method for dip-coating a metal rubber part by adopting a high-temperature resistant organosilicon coating, which comprises the following steps of: adopting bicomponent organosilicon self-dry heat-resistant paint, mixing the component 1 of the paint with a filling material, ball milling, then adding the component 2, uniformly mixing and settling to obtain the high-temperature resistant organosilicon coating; soaking and washing the metal rubber part to be coated with washing gasoline and drying; and adopting a thinner to regulate the viscosity of the high-temperatureresistant organosilicon coating, immerging the metal rubber part into the coating and taking out for solidification after ultrasonic vibration. The metal rubber part obtained by using the method of the invention has smooth appearance and uniform inside immersion; a paint film is not shed when bent in 180 degrees; the paint film is not foamed or shed through heat preservation at 900 DEG C for 48 hours; the paint film is not foamed or shed when the part is preserved at the temperature of 900+ / -10 DEG C for 30 minutes, then decreased to the room temperature, kept for 30 minutes and circulated for 10 times; and the paint film is still not foamed or shed when the part is placed in NO. 3 jet fuel and soaked for 24 hours and placed in water and soaked for 24 hours.

Description

technical field [0001] The invention relates to a dip-coating method for metal rubber parts, in particular to a method for dip-coating metal rubber parts with high-temperature-resistant organic silicon paint. Background technique [0002] Silicone coating is a commonly used coating. In silicone coatings, the bond energy of Si-O bond (89 kcal / mol) is higher than that of C-C bond (58.5 kcal / mol), so it is different from general synthetic resin coatings. In comparison, silicone coatings have particularly good heat resistance, low temperature resistance, chemical corrosion resistance, and electrical properties; because the side chains of silicone resin molecules have organic groups, they have the toughness of general organic polymers; at the same time, they can By modifying with resin or inorganic materials, its service temperature and flexibility can be improved. Although silicone coatings have good performance, there are also some disadvantages, mainly because they generally ...

AI Technical Summary

Problems solved by technology

Although silicone coatings have good performance, there are also some disadvantages, mainly because they generally require a higher curing temperature (180-200°C), the mechanical strength and adhesion are not ideal, and the use temperature cannot meet the requirements of some higher temperature components. requirements

[0003] "Metal rubber parts" are metal mesh parts with a certain density pressed by thin metal wires. There are many gaps inside the parts. Coating with conventional coating methods often makes the internal coating uneven. , Corrosion, oxidation and other problems occur in places with thin coatings or no coatings during use, reducing the service life of parts; at the same time, the use temperature of commonly used silicone coatings is not high enough, which also makes the coating of ordinary silicone coatings The use of metal rubber parts is limited. Develop a high temperature resistant coating and optimize its curing process so that its long-term working temperature can reach 900 ° C. It has certain toughness and adhesion, and the coating can completely cover the interior of metal rubber parts. The gap, which plays the dual role of sealing and anti-corrosion, is a problem that needs to be solved at present