Coating classification: coating film forming substances

Core tip: Introduction: The film-forming material is also called resin, adhesive or base material It will be said that there are coating components bonded together to form an overall uniform coating or film, and at the same time, it will play a role of wetting, penetration and interaction on the substrate or bottom coating to produce necessary adhesion, and basically meet the performance requirements of the coating (varnish or transparent coating is mainly composed of film-forming substances), so film-forming substances are the basic components of the coating Film formation mechanism: 1 Physical mode - solvent volatilization and film formation Traditional thermoplastic solvent based coatings, such as chlorinated polyolefin, nitrocellulose, acrylic resin 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 Coating home news: Introduction: film-forming material also known as resin, adhesive or base material It will be said that there are coating components bonded together to form an overall uniform coating or film, and at the same time, it will play a role of wetting, penetration and interaction on the substrate or bottom coating to produce necessary adhesion, and basically meet the performance requirements of the coating (varnish or transparent coating is mainly composed of film-forming substances), so film-forming substances are the basic components of the coating Mechanism of film formation: 1 Physical way: traditional thermoplastic solvent based coatings, such as chlorinated polyolefin, nitrocellulose, acrylic resin, cab, polyvinyl formal and other film-forming materials, are dissolved in a certain solvent system to prepare coatings with less than 50% solid content After coating, the coatings are evaporated and solidified by solvent It is generally believed that solvent evaporation can be divided into two stages: the first stage is the beginning of film formation, and the macromolecules of film-forming matter have little influence on solvent evaporation, which is mainly determined by the vapor pressure of solvent or the relative evaporation rate of melting international In the second stage, with the solvent evaporation, the viscosity of the coating film increases to a certain extent, the free volume decreases, the solvent diffusion from the coating to the surface is blocked, the solvent evaporation changes from the surface evaporation control to the diffusion control, and the evaporation rate significantly slows down This phase can last for a long time 2 the polymer dispersion system of polymer dispersed system includes emulsion with water as dispersing medium, and non aqueous dispersible organo sol, etc polymer is insoluble in medium and dispersed in separated medium in particle state When the film was formed, the dispersed medium volatilized Under the action of capillary force and surface tension, the emulsion particles were tightly stacked and deformed, the particle shell cracked, the interface between particles gradually disappeared, and polymer molecular chains penetrated and intertwined, thus forming a continuous uniform coating 3 In the process of chemical film-forming, the chemical reaction takes place, and the continuous coating with three-dimensional structure is called chemical film-forming The chemical reactions that may occur cross-linking almost include all chemical reactions in the film-forming materials According to different requirements of film-forming conditions and construction technology, there are room temperature curing, heating curing, UV curing, and single component and two-component membrane Generally, the comprehensive properties of the coating formed by chemical method are better than that by physical method This kind of film-forming material is often called thermosetting resin Except for powder coating, they are all low molecular weight oligomers with low construction viscosity With the increase of cross-linking density, viscosity increases, free volume decreases, TG increases, until a continuous uniform solid coating is formed Classification: home of coatings focuses on 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 effect map,