Coating technology: new environmental protection coating application of dust-free sand blasting

The main purpose of steel structure surface pretreatment is to enhance and improve the adhesion between coating and base Generally, the surface of the workpiece needs to be sandblasted or shot blasted to achieve a certain degree of cleanliness and roughness, so as to increase its surface area, so as to obtain higher adhesion in subsequent spraying The abrasive of traditional sandblasting machine is sprayed on the surface of workpiece at high speed after passing through venturi nozzle The crushed sand will cause dust, pollute the environment and affect the health of construction personnel At the same time, the retention of dust will also affect the quality of spraying Therefore, the application of dust-free sand blasting is more and more extensive Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Coating House News: the main purpose of steel structure surface pretreatment is to enhance and improve the adhesion between coating and base Generally, the surface of the workpiece needs to be sandblasted or shot blasted to achieve a certain degree of cleanliness and roughness, so as to increase its surface area, so as to obtain higher adhesion in subsequent spraying The abrasive of traditional sandblasting machine is sprayed on the surface of workpiece at high speed after passing through venturi nozzle The crushed sand will cause dust, pollute the environment and affect the health of construction personnel At the same time, the retention of dust will also affect the quality of spraying Therefore, the application of dust-free sand blasting is more and more extensive The so-called dust-free sand blasting, in fact, is to recover sand dust together with sand blasting At present, the most classic sandblasting equipment is as follows: 1 vacuum sandblasting machine Figure 1 vacuum sandblasting machine appearance figure Its working principle is to combine the sand blasting machine and vacuum equipment, and connect a sand suction head at the end of the sand blasting pipe: the front end of the sand suction head is an open cone-shaped chamber, and there is another opening on its cone, which is connected with the vacuum equipment The abrasive rebounds after spraying and impacting the steel surface through the nozzle in the venturi Due to the limitation of the working chamber, it can not splash everywhere At this time, the negative pressure generated by the vacuum generator will just grind the steel Material with dust is sucked back together In the sandblasting machine, the dust is separated (generally free falling principle), and the collected abrasive falls into the sandblasting machine cylinder for further use Theoretically speaking, the machine is an automatic circulation sand blasting machine If the abrasive has good comprehensive mechanical properties, it can work continuously In fact, abrasives will gradually wear or break after multiple ejection, so Abrasives should be replaced regularly 2 portable vacuum sandblasting machine the working principle of the sandblasting machine is similar to the above vacuum sandblasting machine, but its structure is more compact, and its self weight is only 3.5kg The sand blasting head is actually a rubber head, which can be close to the workpiece The middle of the rubber head is a concentric circle, the middle hole diameter is a sand blasting channel, and the interlayer is a sand suction channel Its vacuum negative pressure is generated by siphon, and finally the dust is discharged directly into the cloth bag or dust pipe (Fig 2) Fig 2 working principle of portable vacuum sandblasting machine coating house focuses on coating, diatom mud, paint coating, coating process, news and coating of fire retardant coating, diatom mud, paint coating, coating process, decoration knowledge and decoration effect of fire retardant coating,