Automotive soft plastic parts spray paint (bumper spray paint) introduction
The most common exterior polypropylene component is a bumper, as shown in Figure 5-47. The surface treatment of polypropylene bumpers is different from that of basic bumpers. Softeners are required, otherwise they will peel. If acrylic paint is used as the top coat, the steps are as follows.
① First wash the area to be repaired with soapy water, and remove metal poisons on the surface), and then clean it with water. Clean the surface with a topcoat thinner.
② Grind the area to be repaired to form a bevel (thin edge). When the electric sander is used for compacting construction, the 36th coarse grinding wheel is used first, and then the fine micro-paint part (collecting net starting plate) is processed by the 180th finer grinding wheel.
公司的No05900）先薄薄地刮一层，然后再刮至比损坏部位稍稍高一点，干燥30min，再用180号砂纸打磨收边。 ③After applying the masking tape, spray a polyolefin tackifier (such as No05907 from 3M Company) and dry it for 10 minutes. Use a rubber scraper on the tackifier to scrape a thin layer of the intermediate coating first, then Scrape a little higher than the damaged part, dry for 30min, and then sand the edge with 180 grit sandpaper.
④ Spray the polymer starting hydrocarbon tackifier again to the sanded repair area, dry, and then spray the intermediate paint to fill up the small depressions, pinholes and sanding marks. Sand with 240 grit sandpaper until it is flat, replace with 320 or 400 grit sandpaper to thoroughly polish the original paint layer on the plastic part, and remove 80% to 90% of its gloss.
⑤ Spray the tackifier for the third time and dry. Spray intermediate coating, flash dry for 10 ~ 15min, spray another layer of intermediate coating, dry for 1 ~ 2h, and smooth the surface with 400 # sandpaper.
⑥ Dilute and mix the acrylic paint and curing agent, spray after mixing according to the instructions. Do not add softener to the finish.Dry for 8h.
For small surface scratches, you can generally follow the steps below: If the scratches have not entered the substrate, you can directly apply paint; if the scratches have entered the substrate, first apply a thin layer of No05907 tackifier for polypropylene , Dry for 10min, then scrape No05900 putty, and finally use polyolefin tackifier to prime the repaired area, then spray the topcoat.
2. Spraying of polyurethane bumper、脱脂、填补腻子（同聚丙烯保险杠的表面 ），随后擦拭和吹净待修补区域，并遮盖除待漆部位以外的所有区域。 ① First the polyurethane bumper to be repaired, degrease and fill the putty (same as the surface polypropylene bumper), then wipe and blow the area to be repaired, and cover all areas except the area to be painted.
② Spray 2 wet coatings on the area to be repaired with 3M Na0S905, dry for 10 ~ 15min, and then spray the second coating. After drying for 1-2 hours, use 320 or 400 grit sandpaper to smooth the coating.
③ Mix softener with thermoplastic acrylic paint or two-component acrylic paint (no need to add softener in base paint).
④Before spraying, the sample should be sprayed for color comparison. If it is a two-stage application, flash dry for about 5 minutes after coating, then apply a layer of clear coating (softener is added to the varnish), and dry as required in the instruction.
The above is all the content that Xiaobian introduced to you, so after you read it, do you understand the problem of spraying soft plastics inside and outside the car? 后是不是非常有帮助呢，最后希望小编的介绍能够帮助到大家。 After reading this , is it very helpful? Finally, I hope that the introduction of the editor will help everyone.