What should we pay attention to when painting metal and plastic

What should we pay attention to when painting metal and plastic:

Dalian metal plastic coating mainly plays the role of covering. Do not spray too thick, otherwise the paint color will be too dark and too deep. The matching diluent and corresponding dilution ratio must be selected according to the instructions provided by the paint manufacturer, and the viscometer shall be used correctly to master the required viscosity to ensure that the paint color meets the requirements. When the paint output of the spray gun needs to be adjusted, the trigger of the spray gun can be pulled to the bottom, and the moving speed of the spray gun can be used to increase or reduce the thickness and dryness of the paint film.

Check the air compressor and water dust separator in the oil painting room to keep the painting hose clean. All other processes before spraying shall be completed outside the paint baking room, except for dust removal with blower gun and sticky cloth; You must wear the specified painting clothes and safety protection equipment before entering the paint baking room for operation; Non essential personnel are not allowed to enter the paint baking room. Due to the different organizational structure and hardness of various materials, for example, the paint layer is harder than the plastic, so after being polished by the same sandpaper at the same time, the plastic will be knocked off more, resulting in uneven phenomenon. Because the concave layer is very shallow and on the flat surface, the adhesion of atomic ash is poor, and the drying time is slow, so it is not easy to polish.

After degreasing and dedusting of Dalian metal plastic coating, use the diluted primer (the ratio of primer to quick drying diluent is 1:1) to spray it falsely once, and then spray it again after drying. In order to reduce the spraying times and grinding time, the smooth flow of primer shall be ensured as far as possible without flash drying between each pass. Blow dry the paint film on the surface. After the primer loses its brightness, continue spraying again and again until the depression thickness is reached. Anti sticking is applicable to dark wire slot and double wire slot; Positive adhesion is suitable for decorative interface; Compaction is suitable for large-area spraying and repair at the edge of gap; Masking is applicable to open trunking (this method is used for spraying primer); Covering is applicable to the treatment of tires, headlights and two adjacent parts at the same time; It is applicable to door trim strip and front and rear bumper trim strip.

On the premise of meeting the strength requirements, the substrate of the workpiece can use ordinary materials instead of valuable materials, and only high-quality materials are used for the coating, so that "good steel is used on the blade", and it can also be spray formed. In addition to spray welding, the combination of thermal spraying coating and substrate is mainly physical and mechanical combination, the bonding strength is not high, and the impact resistance and heavy load performance of the coating are poor.

When the coating position of Dalian metal plastic is all the outer surfaces of the workpiece, the substrate edge at the coating position must be chamfered, and the chamfering shall not be greater than 45 °, generally 45 ° or 30 °, and the width shall not be less than 1mm; The depth of the spraying groove is the thickness of the design coating, and the tolerance is generally controlled within 0.05mm. When designing and machining the spraying groove, it is necessary to consider the subsequent grinding or turning to align the positioning position, so as to avoid no benchmark for subsequent machining.