Coating technology: factors affecting adhesion of plastic coating

Core tips: 1 Solubility parameter theory The solubility parameters of solvents, coatings and plastics are respectively represented by δ s, δ B and δ P when △ δ∣＞ 2, there is no compatibility (solubility) between them If ∣ δ b-δ P ∣ < 2, ∣ δ s-δ P ∣ = 2, the coating film has good adhesion For example, it is known that ABS plastics have better painting performance, because ABS surface contains solution Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Paint Home News: 1 The theoretical solvent of solubility parameter, the basis of paint and the solubility parameter of plastic are respectively represented by δ s, δ B and δ P when △ δ＞ 2, there is no compatibility (solubility) between them If ∣ δ b-δ P ∣ < 2, ∣ δ s-δ P ∣ = 2, the coating film has good adhesion For example, it is known that ABS plastics have better painting performance Because ABS surface contains styrene chain segment which can be dissolved and expanded by solvent, its solubility parameter δ PS = 8.6-9.7, while the acrylic paint δ acrylic acid = 9.0-9.5, the polyurethane paint δ polyurethane ≈ 10.0, the nitro paint δ nitro paint ≈ 11.0.2 In order to increase the adhesion of the film, the physical adsorption theory can precoat a film with stable orientation For example, a thin film with orientation can be formed after the ABS plastic surface is sprayed with dilute acrylic paint with higher glass transition temperature, the modified polypropylene surface is sprayed with chlorinated polypropylene solution, or the plastic parts are treated with dilute aqueous polymer solution as surface modifier 3 When the wettability of the film increases, the distance between the molecules will also be shortened, and the force will also increase, so the increase of wettability can improve the adhesion of the film 4 The anchoring effect of the film solidified by the rough porous surface will produce many anchoring points, which will increase the adhesion of the film, but will affect the appearance of the film Therefore, solvent cleaning should prevent excessive swelling residue, so as to avoid porosity or paint absorption Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,