Between coating and substrate can be combined by mechanical, physical adsorption (including wetting), the formation of hydrogen bonds and bonds, diffusion effect such as each other together, its adhesion is good or bad depends on the degree of the combination of coating and substrate, there are many kinds of way to increase the adhesion (such as with a variety of resin, the processing of the substrate, adding adhesion accelerator, etc.), add
adhesion promoter is a simple and efficient method.Adhesion on ordinary book has introduced a lot of books, now let me talk to you to explore the high-density polyolefin plastic PE, PP and nylon PA way to increase the adhesion, and on how to increase the adhesion to glass:
One. Polyolefin plastic substrate PE, PP briefing:
PE and PP is inert organic material, its itself does not have polar groups and surface energy is low.The surface tension in 1.0 * 10 ˉ & sup2;Dagen below, or less, so ordinary paint doesn't wetting its substrate, not to mention other chemical bonds can play a role.
1. Increases on PP substrate adhesion method can be directly spray on the surface of a thin and uniform layer of chlorinated polypropylene resin, its theory is the same material through the miscibility, winding and HCL free acid of PP substrate "erosion" and play a role, can increase the surface of the substrate, to make the group of paint to "catch" to live.
2. The method of PE substrate: most by corona treatment (for other treatment methods have defended side, such as flame, chromate treatment, etc.).But corona equipment is very expensive, it makes little sense to promote.Suggestion: use fluorocarbon flow ping agent on the PE substrate wetting.Appropriate heated to a temperature of about 80 ℃, the paint application polyamide resin and polyurethane.Add some appropriate split darma resin.Of course there are other ways: with fluorocarbon class of wetting agent wetting at the same time with something such as coupling agent.Make the PE substrate above the polar groups, etc.The adhesive agent for PP substrate has very mature, for PE material end remains to be further discussed.
Two. PA (nylon) substrate to improve adhesion method is to spray a thin and uniform layer of polyamide resin film, or directly with polyamide resin as main resin add some adhesion promoter directly spray can.
Three. Discussion on the adhesion of glass substrate:
Glass substrate is a kind of hydrophilic inorganic substrate.In the general case, the glass is easy to combine with moisture in the air.Even in the dry room can also be seen under a microscope on the glass surface with a thin layer of water spray layer.In wet weather, could be seen with the naked eye.Therefore the paint in the humidity environment construction, the glass substrate is not firm, because there is a layer of water blocking paint group, grasped the glass, even in the long time can capture the glass will be off the paint.So the best way to attach is can penetrate fog layer, with groups hold glass, known as the hydrophilic, and wrapped with paint itself adhesion (That is lipophilicity).
At present is proved with epoxy and amino adhesion promoter can do more than two points.And, of course, many with both epoxy group and amino group and other groups, such as ether bond, etc.) or more groups of coupling agent.Above the adhesion promoter can increase the adhesion to glass well.If the customer requirements more stringent adhesion, can be sprayed on the glass substrate or concentration of one for more than 5% with groups of adhesion promoter and then add 1-2% of total amount of additives to paint adhesion.
标签： adhesion promoter
