Flame spraying process of the hottest polyphenylen

2022-08-17
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Polyphenylene sulfide powder flame spraying process

1 The flame spraying process of polyphenylene sulfide powder plays a decisive role in the measurement of tension accuracy

the process flow is: degreasing and cleaning of the surface to be sprayed → sandblasting of the surface to be sprayed → spraying a layer of zinc or aluminum on the surface to be sprayed (thickness 0.05 ~ 0.08mm) → flame preheating → spraying polyphenylene sulfide coating on the surface to be sprayed → stress reduction or elimination treatment → cooling treatment → quality inspection

note: during flame spraying of polyphenylene sulfide powder, The surface to be sprayed must be preheated. The preheating temperature is about 300 ℃. If the surface to be sprayed is steel, a layer of iron oxide will be produced on the surface to be sprayed after preheating, which will easily affect the adhesion between polyphenylene sulfide coating and steel. In order to improve the adhesion between polyphenylene sulfide coating and steel, it is recommended to spray a layer of zinc or aluminum (thickness 0.05 ~ 0.08mm) on the surface to be sprayed with sand, Then preheat on the zinc or aluminum coating (no oxide layer will be produced). Spraying polyphenylene sulfide can improve the adhesion. As long as other metals do not produce oxide layer during preheating, they can directly spray polyphenylene sulfide coating on the surface to be sprayed as long as they have a strong relationship with research institutions, universities, enterprises and scientists

2. Technological process of repairing chemical enamel coating by polyphenylene sulfide powder flame spraying

the process flow is: degreasing and cleaning of the surface to be sprayed → sandblasting or roughening of the surface to be sprayed → coating of polyphenylene sulfide on the surface to be sprayed → stress reduction or elimination treatment → cooling treatment → quality inspection

3. Spraying process parameters

three process parameters of polyphenylene sulfide powder flame spraying: pressure and flow of each gas, preheating temperature of parts and spraying distance:

(1) pressure and flow of each gas

according to the operating instructions of zk6018 plastic powder flame spraying machine, such as detection method, structure of the whole machine, rigidity of the whole machine, parallelism of the pressure plate, measuring elements, materials, displacement and sinking of load sensors, adjust the pressure and flow of each gas before spraying, To ensure stable flame of the spray gun, uniform powder feeding and excellent coating performance

(2) preheating temperature of parts

in the process of plastic powder flame spraying, the preheating temperature of the surface of parts is a very important process parameter. Practice has proved that the low preheating temperature of parts will directly affect the bonding strength between the coating and the substrate; If the preheating temperature is too high, the bonding strength will also be reduced, and the plastic coating will be charred or even burned. The preheating temperature of the surface to be sprayed is generally 300 ~ 350 ℃. When using zk6018 plastic powder flame spraying machine, preheating gun and computer thermometer, it is generally operated synchronously by two people during large-area field construction, that is, one person will preheat with a preheating gun in front and measure the temperature with a computer, and the other person will directly spray on the preheated surface. This will not affect the construction progress nor the coating quality

(3) spraying distance

during polyphenylene sulfide powder flame spraying, the reasonable adjustment of spraying distance is also very important to ensure the coating quality. Generally speaking, when polyphenylene sulfide powder is sprayed by flame, the distance between the nozzle end face and the part surface should be 150 ~ 200 mm. The spraying distance is too close, it is difficult to control the coating temperature, and it is easy to scorch and burn; Spraying distance is too large, which is easy to reduce the spraying efficiency

in actual operation, the spraying distance should be adjusted at any time according to the flame temperature. When the powder feeding valve is opened, it is obvious that the flame color turns red and the length of the flame becomes longer. According to experience, the spraying surface of parts should be placed at the end of the red flame. At the same time, the appearance quality of the coating should be continuously observed

4. The coating performance and supporting equipment of polyphenylene sulfide powder flame spraying

(I) coating performance. Polyphenylene sulfide for flame spraying is prepared from PPS raw powder plus modified materials, including various pigments, anti-aging agents, leveling agents, plasticizers, etc. Through modification, polyphenylene sulfide powder is easy to be flame sprayed, so that the coating has the required color and various properties. The particle size of the powder is generally 60-80 mesh

Shaanxi Zhongke Surface Engineering Co., Ltd. provides users with polyphenylene sulfide powder manufacturers for flame spraying to ensure the supply of domestic flame spraying polyphenylene sulfide Market

Table 2 performance of polyphenylene sulfide coating with modified materials

(2) supporting equipment for spraying:

air compressor: one set of 0.6 and 6 cubic meters/minute respectively

oil water separator: supporting with air compressor

sand blasting machine: pressure type or adsorption type

drying oven: 0 ℃ ~ 300 ℃

coating pinhole detector

coating thickness gauge acetylene gas Oxygen

special equipment for polyphenylene sulfide powder flame spraying 98.07 standby includes:

zk6018 plastic powder flame spraying machine

preheating gun (with oxygen and acetylene)

Computer thermometer (end)

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