SU1380801A1 - Method of producing polymeric coatings - Google Patents

Abstract

The invention relates to a technique for applying polymer powder coatings on metal surfaces in an electrostatic field. It makes it possible to increase the uniformity of the coating thickness of products with large dimensions and installed vertically on the conveyor, by first spraying and charging the powder, directing it to the product by the process gas stream. After a cloud of charged particles appears around the product, the product is earthed and at the same time the process gas flow is turned off for 2-3 seconds, then the powder is recharged and transported in 17-20 seconds and the product is again briefly grounded shutdown of a technological gas stream. you are

Description

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This invention relates to a technique for applying polymer powder coatings on metal surfaces and an electrostatic field.

The aim of the invention is to improve the uniformity of the coating thickness.

An example: P-EI-17 (TU 22-74) and 186-8A paints are used as a coating material.

The coating is applied to the products - metal ducts TU 36-71fi-7R1 up to 2.5 m long with a round and rectangular cross section that fits. in a circle with a diameter of 0.2S to i m, while subjecting both the inner and outer surfaces of the air ducts to the coating. The latter, irrespective of the configuration of the cross-section, are combined in a batch according to the principle of approximately the same area to be coated.

The product is placed on the horse suspension of the dielectric insert and is fed into the deposition chamber of the powdered polymer. In the chamber, the suspension with the product is captured by spring-loaded contacts, which ensure the connection of the product with grounding only via a time relay.

Particles move the particles to the atomizers along the mains; at the same time, a high-voltage potential is applied to their electrodes. In nebulizers, the powder is charged and an electrostatic field is created in the chamber. Due to the fact that the product is currently isolated from the ground, the additional contacts of the time relay provide the supply voltage to the drive of the process gas flow unit. The charged particles of the polymer under the action of electrostatic field forces arising between the polymer, having a charge with a grounded chamber, and under the action of the process gas stream rush down the chamber and pass along the outer and inner side surfaces of the product.

polymers with negatively charged female particles. Then the time relay is triggered and a short-term zlzem is triggered. The psnie products for a period of up to 2-3 s and simultaneously with the earthing of the product turn off the suction unit for suction of the air-powder mixture from B) in the 1st cavity of the chamber (technologist -10-100- toesky gas flow).

During this time, the polymer particles are affected only. electrostatic forces attracting them to the side surfaces of the LIAh product. Then, for 17–20 s, the grounding of the product is interrupted and at the same time the process gas flow unit is put into operation. During this time interval, the polymer particles will fall from the top edge of the product to the bottom and cover its side surface with a cloud. After this, the product is earthed again for a short time and at the same time it stops acting on the process gas flow.

Thus, repeating the polymer deposition process several times

30 for 30-45 s, build up a layer of polymer powder coating on the product.

Next, the sprayed article is fed to the oven for heat treatment of the polymer.

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Claims (1)

Invention Formula The method of obtaining polymer coatings, which consists in applying a powdered polymer in an electrostatic field to a periodically grounded product, which is under the influence of the process gas stream, and heat treatment of the deposited polymer, which is different from ayushi and fi in order to increase the uniformity of thickness the coating, the effect of the process gas stream on the polymer powder is stopped simultaneously with the grounding of the product. The method of obtaining polymer coatings, which consists in applying a powdered polymer in an electrostatic field to a periodically grounded product, which is under the influence of the process gas stream, and heat treatment of the deposited polymer, which is different from ayushi and fi in order to increase the uniformity of thickness the coating, the effect of the process gas stream on the polymer powder is stopped simultaneously with the grounding of the product. create a cloud of suspended dust particles Composer V. Dogogin - ЁЯ§-1 12Е У 1 ± Д2.5.2ДЯ ™ $ Tehred M. Hodaih Proofreader O.Kunddik Zakah 1139/10 Circulation 633 Subscription VNIIPI USSR State Committee for Inventions and Discoveries I3035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, st. Project, 4 Invention Formula The method of obtaining polymer coatings, which consists in applying a powdered polymer in an electrostatic field to a periodically grounded product, which is under the influence of the process gas stream, and heat treatment of the deposited polymer, which is different from ayushi and fi in order to increase the uniformity of thickness the coating, the effect of the process gas stream on the polymer powder is stopped simultaneously with the grounding of the product.