Coating process: Causes and precautions of high temperature resistant paint coating process

Core tip: high temperature resistant paint is the paint that can withstand high temperature oxidation and other media corrosion It has good heat resistance, corrosion resistance up to 400-1700 ℃, long service life, self curing at room temperature, aging resistance, radiation resistance, water resistance, salt fog resistance, organic solvent resistance It is widely used in auto parts, semiconductor industry, aerospace industry, petrochemical industry, mechanical industry, medical industry, electronic and electrical fields, etc Generally, there are many lesions in the coating process of high temperature resistant paint Here is an introduction to the causes of the lesions and construction precautions 1、 High temperature resistance Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Paint Home News: high temperature resistant paint is the paint that can withstand high temperature oxidation and other media corrosion It has good heat resistance, corrosion resistance up to 400-1700 ℃, long service life, self curing at room temperature, aging resistance, radiation resistance, water resistance, salt fog resistance, organic solvent resistance It is widely used in auto parts, semiconductor industry, aerospace industry, petrochemical industry, mechanical industry, medical industry, electronic and electrical fields, etc Generally, there are many lesions in the coating process of high temperature resistant paint Here is an introduction to the causes of the lesions and construction precautions 1、 Causes of yellowing of high temperature resistant paint: 1 High air humidity due to environmental factors; 2 Over reaction due to high temperature; 3 Direct ultraviolet radiation; low yellowing resistance of high temperature resistant paint itself 2、 Causes of high temperature resistant paint sagging: 1 The coating surface is flat and neat; 2 The operation is wrong, and the nozzle gun is too large; 3 The coating is too thick, and the coating is thin for many times; 4 The coating is too thin 3、 Reasons for cracking of high temperature resistant paint: 1 The coating is too thick; 2 The paint is out of date; 3 The solid content of the top coat is low, the resin itself has problems and the external environment; 4 The accelerator content is too high; 5 The coating is too thick, the hardness of the coating itself is high, and it is brittle 4、 The reasons for the whiteness of high temperature resistant paint: 1 Insufficient solvent resolution; 2 Too high moisture concentration; 3 Too high moisture content of the substrate itself 5、 Causes of undercut of high temperature resistant paint: 1 Two kinds of primer and finish paint are not matched; 2 The primer coating is too thick; 3 The upper paint is not completely dry; 6 There is sandpaper grain on the high temperature resistant paint: 1 It is not polished along the direction of wood grain; 2 The sandpaper number is too large, and it is polished before it is dry 7、 Reasons for oil leakage of high temperature resistant paint: 1 Oil residue and wax in the coating; 2 Water or oil residue in the high temperature resistant paint; 3 Too high or too low viscosity of the paint 8、 Blistering causes of high temperature resistant paint: 1 The diluent and curing agent are not matched; 2 The coating has moisture; 3 The air humidity is high; 4 The mixing is uneven; 5 The surface is uneven; 6 The coating has moisture and oil stain 9、 Reasons for granulation of high temperature resistant paint: 1 There are impurities in the high temperature resistant paint that have not been filtered; 2 There are too much dust or impurities; 3 The mixing is uneven and not fully mixed; 4 The diluent is not matched and does not make the agent dissolve; 5 The spraying is not standardized 10、 Reasons for the surface roughness of high temperature resistant paint: 1 The fineness of the coating is not enough, and there is dirt on the surface of the coating; 2 The construction environment is too dirty and not clean; 3 The coating is not enough 11、 Causes for peeling of high temperature resistant paint: 1 No oil sealing treatment; 2 The primer is not dry and the top coat is not applied; 3 The moisture content of the surface layer of the coating is too high; 4 Two kinds of primer and top coat are not matched 12、 Wrinkle causes of high temperature resistant paint: 1 Too much curing agent, too fast drying speed; 2 Inconsistent drying speed of primer and finish paint; 3 Nozzle not adjusted well; 4 Too thick coating, too high viscosity 13、 The reasons of high temperature resistant paint: 1 The coating is too thin, the spraying is uneven, the bottom is shallow; 2 The cover is low, and the sanding is excessive 14、 Reasons for orange peel of high temperature resistant paint: 1 Poor leveling; 2 Too many diluents or mismatches; 3 Uneven substrate or poor treatment; 4 Low temperature 15、 The reasons of high temperature resistant paint coating sticking to sandpaper are as follows: 1 The solvent itself has poor solubility, and the air humidity is large; 2 The coating is not dry, the coating is too thick, and there are few accelerators 16、 There are pinhole lesions in the coating of high temperature resistant paint: 1 Oil and water pollution; 2 Even mixing, air inside the high temperature resistant paint; 3 Uneven surface of the coating; 4 Too thick spraying, poor volatile solvent, precautions for high temperature resistant paint construction 1 Base treatment - Sa2.5 level treatment: before the construction of high temperature resistant paint, the surface of the workpiece shall be treated with sand blasting and shot peening to Sa2.5 level Specific operation: clean the dust, oil, welding slag, rust and old paint film on the surface of the object, sand blasting and shot peening to meet the construction requirements Local repair surface shall be polished to ST3 It is strictly prohibited to bring water into the construction of high temperature paint 2 Specific operation: scrub the surface of workpiece with diluent; (1) adjust the viscosity of coating with special diluent, and the diluent is special diluent, the dosage is about: Airless Spray - about 5% (by coating weight); air spray - about 15-20% (by coating weight); brush - about 10-15% (by coating weight); (2) construction method: Airless spray, air spray or brush Note: during construction, the temperature of the base material must be 3 ℃ higher than the dew point, but not higher than 60 ℃; (3) coating curing: after coating, put into use or dry at room temperature for 0.5-1.0 hours after natural curing at room temperature, then bake in an oven at 180-200 ℃ for 0.5 hours, take out the temperature to be used 3 High temperature resistant paint construction method: high pressure airless spraying airless spraying airtight spraying high temperature resistant paint; The spraying pressure of the orifice with the maximum dilution 3, the thickness of the film 4, and the temperature of the substrate with the shortest coating interval are the longest Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,