What is the adhesion of water based paint, and how to increase the adhesion of water based paint?

In the use of water-based wood paints, especially in the process of "water and oil combination" like yours, poor adhesion often occurs. The reason is that the oily bottom film is very dense, and the affinity of the water-based coating to the substrate is insufficient, resulting in poor adhesion. You can try SV-6145, a waterborne acrylic modified polyurethane dispersion.

We also encountered these problems at the beginning of this year and looked for a long time to solve them, and we have been using them for a long time.

The adhesion of water-based paint itself is not as good as that of oil-based paint, and the more water you add, the lower the solid content per unit area, the worse the adhesion is

The adaptability of water-based paint to the surface of the material is very good, and the adhesion of the coating is strong.

The adhesion of water-based paint is not as good as that of oil-based paint. High requirements for substrates. In short, it is not as good as oil-based paint.

Can you introduce a better water-based one?

I've been a waterborne wood paint technician for many years, so I know a lot about this problem.

Water-based paint is used separately to make boards and processes, and there is generally no big problem.

However, there are big problems with "water-oil combination" or "oil-bottom water surface" (the substrate is oil-based paint, PU primer or UV primer), and there are some harder and smoother substrates where the adhesion is not easy to meet, such as melamine boards and the like.

This problem is also a difficult point in the industry, and the most important thing is in the choice of resin.

I tried an SV-6145 from Qingdao Jiaye Tiancheng, and the effect was good, and I was quite impressed.

The choice of resin is the main cause of the problem. You can also add some coupling agent to the formula, the effect is obvious, but it is not too mainstream, and it may also cause the expiration date to be shortened.

Material surface treatment First of all, it is necessary to ensure that the surface of the spraying substrate is oil-free and clean. Dirty surfaces can seriously affect adhesion. Secondly, for smooth substrates that are difficult to adhere, surface treatments such as sandblasting, corona, primer, and flame can be carried out to obtain porous, rough, and multi-functional surface substrates;

Coating film-forming performance The film-forming performance of the coating directly affects the size of adhesion, so it is necessary to adjust the type and dosage of film-forming additives and control the length of film-forming time to achieve the best compactness of the paint film, and a good film-forming can bring lasting adhesion;

Coating wetting performance Dilution of water-based paint with pure water has a relatively large surface tension, and there is no way to adhere to the low surface tension substrate, which seriously affects the adhesion improvement. According to the coating application process, choosing an economical and suitable wetting agent is one of the effective ways to improve adhesion.

Dry film thickness The thickness of the paint film is inversely proportional to the adhesion. Excessively thick paint film not only causes waste, but also reduces coating adhesion. Because as the thickness of the coating film increases, so does its cohesion, and the adhesion ensures that it remains the same; When the increase in cohesion is greater than the adhesion, the coating has poor adhesion.

The reduction of polar groups on either side of the surface of the paint film and the substrate will lead to a decrease in the adhesion of the paint film; The presence of contaminants on the surface of the substrate will reduce the polarity of the substrate and cause a decrease in adhesion; In the drying process of the coating, with the increase of the solvent and the degree of cross-linking, the polar groups in the coating will be consumed, and the cohesion between the molecules of the film-forming substances will increase, and the shrinkage of the paint film will lead to the reduction of the adhesion of the paint film.

Therefore, the purpose of improving adhesion can be achieved by reducing the cohesion of the paint film

1. Add appropriate pigments to the paint to reduce the cohesion of the paint film and improve the adhesion of the paint film on the substrate. This is the reason why pigment coats generally have better adhesion than varnishes.

2. Reduce the thickness of the coating, reduce the cohesion, and improve the adhesion strength of the paint film to the substrate;

Water-based paint. The wettability of the paint on the substrate is another important factor affecting the adhesion of the water-based paint, and the wetting of the paint on the surface of the substrate depends on the surface tension of the paint liquid, therefore, reducing the surface tension of the paint can improve the wetting efficiency and enhance the adhesion of the coating to the surface of the substrate.

The difference in the coefficient of thermal expansion between the paint film and the substrate will also have an impact on the adhesion performance of the paint film. In general, the expansion coefficient of the paint film is greater than that of the substrate, and the expansion or contraction of the paint film is greater than that of the substrate when the temperature changes, which causes the corresponding deformation of the paint film and leads to the reduction of adhesion. The smaller the coefficient of thermal expansion of the coating, the better the adhesion of the coating film.

The adhesion of water-based paint has not been good, and the primer can be relieved to a certain extent, if it is for adhesion and using a corrosive solvent does not seem to be cost-effective LZ or switch to oil-based paint......Wish.

Hello, I am glad to answer for you, how to solve the poor adhesion of rubber water-based paint? Method of poor adhesion of water-based paint: first ensure that the pre-treatment is clean, no rust, no acid and alkali, no dust and dirt.

Second, do a good job of surface treatment, do phosphating electrophoresis for steel, and remove surface stress for plastics, which can be properly polished. Third, choose the right paint. Fourth, it is necessary to have a suitable process and spraying environment, temperature and humidity control, spraying film thickness, etc.

Fifth, baking is important, the temperature and the length of time have a great impact on adhesion.

Summary. In general, oil-based polyester paints have stronger adhesion than water-based polyester paints. This is because oil-based polyester paints often contain organic solvents that can penetrate deeper into the surface underneath the coating, enhancing the adhesion of the coating to the substrate.

However, with the continuous development of technology, the formulation of waterborne polyester paint has also been improved, with better adhesion and corrosion resistance. Therefore, when choosing the right coating, it is necessary to consider the characteristics of the coating and the actual application situation, so as to choose the most suitable type of coating.

In general, oil-based polyester paints have stronger adhesion than water-based polyester paints. This is because oil-based polyester paints often contain organic solvents that can penetrate deeper into the surface underneath the coating, enhancing the adhesion of the coating to the substrate. However, with the continuous development of technology, the formulation of water-based polyester paints has also been improved by the group of punches, with better adhesion and corrosion resistance.

Therefore, when choosing the right coating, it is necessary to consider the characteristics of the coating and the actual application situation, so as to select the most suitable type of coating megadifference.

Water-based polyester paint will not fade when bleached in high-temperature hydrogen peroxide.

Waterborne polyester paint is an environmentally friendly coating that usually has good chemical and temperature resistance, but the performance of different brands and models will vary. Water-based polyester paint may fade or be damaged in hydrogen peroxide at high temperatures, depending on the paint formula and the specific use environment. Hydrogen peroxide is an oxidizing agent with strong oxidizing properties, and when used at high temperatures, its oxidizing properties will be more powerful, which may cause oxidation reactions of organic pigment molecules in waterborne polyester paints, which will cause the pigments to fade or fall off.

In addition, high temperatures and strong oxidizing agents can also cause damage to the substrate of waterborne polyester paints, resulting in blistering or cracking of the coating. Therefore, when using water-based polyester paints, care should be taken to avoid exposing them to high temperatures and strong oxidizing agents. If you must use it in this environment, you can choose a coating that is more chemically resistant and add a chemical-resistant agent to the surface of the coating to improve its resistance.

At the same time, the coating should be fully pretreated and coated according to the specific situation to ensure the bond strength between the coating and the substrate and the durability of the coating.

The adhesion of modern water paint is very slow, the shaping force is strong, the hail is fast, it is also more environmentally friendly, durable and durable, and it can also purify the air.

The product responsibility of the modern water machine is very good, if you dry the stool Ling Zhaozhi Wang block, your general things are not able to weigh the jujube rent, the adhesion is very good, and it is very environmentally friendly.

It is a good interior decoration product with clean odor and environmental protection, strong hiding power, mildew and moisture resistance, and good scrubbing resistance.

It is necessary to improve the coating amount process technology for the adhesion of water-based paint film for furniture. The size of the adhesion of the water paint.

The product responsibility of modern water machine is very good, if it is dry, your general things are not weighed, the adhesion is very good, and it is very environmentally friendly.

PP color paint can make the surface of PP substrate products colorful, and the paint has weather resistance and other protective effects. However, the PP substrate is a non-polar material, and it is easy to apply oil or peel off the paint when painting, and it is difficult to meet the quality requirements of the spraying coating.

The traditional way to improve the adhesion of PP substrate can be treated by flame or arc to improve the adhesion of the upper coating.

The equipment is expensive and the operation is inconvenient, which makes it quite limited in use The use of Shizukawa Chemical PP treatment agent as a primer can not only improve the adhesion of paint to the PP substrate, form a good interlayer adhesion, but also improve the water resistance, gasoline resistance and heat resistance of coatings and inks.

Shizukawa PP treatment agent can be applied to PP materials, modified PP materials, miscellaneous materials and other surface spraying processes, which can improve the wettability and surface adhesion of PP substrates, and form a layer of film between the substrate and paint, combined with each other, so that they can achieve full cross-linking, so as to promote the interlayer adhesion between paint and PP materials, and form a firm coating, so as to solve the spraying caused by poor adhesion.

Paint off and other undesirable phenomena.