A brief introduction to water based resins and water based coatings

Due to the large difference between the use of water as a medium and solvent-based industrial coatings, the main aspects are as follows: the influence of surface tension: the surface tension of water is higher than 72 dynes, so it is much higher than that of general solvents, resulting in a large difference in construction effect, in order to meet the construction requirements, surfactants must be added to reduce the surface tension of water-based coatings; Effects of bubbles:

Because the introduction of surfactants will cause foam, resulting in defects such as pinholes, craters, and shrinkage holes on the surface of the coating, defoamers need to be added to water-based industrial paints; Dispersibility: The structure of the dispersant in the waterborne system will also be different from that of the solvent-based coating, because the hydration chain of the dispersant in the water-based system needs to be stretched in water, so some of the dispersants of the solvent-based coating cannot be applied to the water-based system coating; Tianjin Hepfil New Materials....

Based on the polymerization reaction theory of coating resin synthesis, this book introduces the synthetic monomer, synthesis principle, synthesis formula and synthesis process of waterborne alkyd resin, waterborne polyester resin, waterborne acrylic resin, waterborne polyurethane resin, waterborne light-curing resin, waterborne epoxy resin and waterborne amino resin, focusing on revealing the principle of waterborne resin and the relationship between structure and performance. At the same time, the basic composition and formulation principle of water-based coatings, water-based architectural coatings, water-based wood coatings, water-based plastic coatings, and water-based metal coatings were introduced. This book combines theory and practice, and lists a large number of synthesis examples and coating formulations, which has strong practicability.

What is the difference between oil-based paint and water-based paint.

The components of water-based coatings include water, emulsions, film-forming additives, preservatives, pH adjusters, pigments, fillers, thickeners, dispersants, defoamers, wetting agents, and rheology modifiers.

According to the different main components of water-based coatings, there are three main categories: acrylic; compounds of acrylic acid and polyurethane; Polyurethanes.

Solvent-based coatings are architectural coatings made with organic solvents as dispersion mediums. Although solvent-based coatings have problems such as polluting the environment, wasting energy and high cost, solvent-based coatings still have a certain range of applications and their own obvious advantages. First of all, from the perspective of performance comparison, solvent-based coatings still have a great advantage.

1) The quality of the coating film: In the occasion with high decorative requirements, the fullness of water-based coatings usually does not meet people's requirements, and high-gloss coatings are mostly achieved by using solvent-based coatings. 2) Adaptability to various construction environments:

For water-based coatings, the volatilization rate cannot be adjusted, and in order to obtain high-performance water-based latex coating films, it is necessary to control the temperature and humidity of the construction environment. In some harsh environments, such as the construction of exterior walls and bridges, it is impossible to artificially create a temperature and humidity controllable condition, so the application of water-based coatings may be limited; On the other hand, solvent-based coatings allow the solvent ratio to be controlled according to location and climate to obtain a high-quality coating film. 3) Solvent-based coatings have a wide range of resins to choose from:

In solvent-based coatings, almost all kinds of old resin can be dissolved in solvents, and the choice is wide. Different resins have their own unique properties, such as polyurethane has excellent weather and chemical resistance, high gloss, wear resistance, etc., silicone resin has excellent heat resistance and can be used as a binder for heat-resistant and weather-resistant coatings, 4) cleaning problems. The construction tools of solvent-based coatings must be cleaned with solvents, which are harmful to the human body and the environment.

The construction tools of water-based coatings can be cleaned with clean water and are harmless to the human body.

All coatings that use water as a solvent or as a dispersion medium can be called water-based coating materials. There are three types of water-based coatings: water-soluble paints, water-dilution paints, and water-dispersible paints (latex coatings). Water-soluble coatings are water-soluble resins as film-formers, represented by polyvinyl alcohol and its various modifiers, in addition to water-soluble alkyd resins, water-soluble epoxy resins and inorganic polymer water-based resins.

1.Water-based coatings use water as a solvent, saving a lot of resources; Water-based coatings eliminate fire hazards during construction; Reduced pollution to the atmosphere; Water-based coatings use only a small amount of low-toxicity alcohol ether organic solvents, which improves the working environment conditions. The general organic solvent of water-based paint (accounting for the coating) is between 10 and 15, and the current cathode electrophoretic coating has been reduced to the following, which has a significant effect on reducing pollution and saving resources.

2.Water-based coatings can be applied directly on wet surfaces and in wet environments; Water-based coatings have good adaptability to the surface of the material and strong coating adhesion. 3.

Water-based paint coating tools can be cleaned with water, which greatly reduces the consumption of cleaning solvents. 4.The electrophoretic coating film of water-based paint is uniform and flat.

Good flattening; The inner cavity, weld, edges and edges can be coated with a certain thickness of coating film, which has good protection; The electrophoretic coating has the best corrosion resistance, and the salt spray resistance of the thick film cathode electrophoretic coating can reach up to 1200h.

Generally speaking, the paint with the dissolving wheel blind hunger agent as the dispersion medium is the dosage form coating of the dissolving god clan.

Generally speaking, the paint with water as the main dispersion medium is a water-based coating.

Solvent-based coatings are coatings that use organic solvents (such as benzene, dichloroethane, etc.) as solvents to disperse or tremble or dissolve cavities to form films, pigments and fillers, etc.; Water-based paints are paints that use water as a solvent to disperse or dissolve film-forming substances, pigments and fillers, etc.