Water-type steel structure industrial paint category and application!

，、、、。 ，。《ISO12944》：C1、C2、C3、C4、C5、C5mcom" href="http://">coatingol.
com。C1、C2、C3。

C1、,60u，120u，180u。，，。

C2、：，，，，。

C3、，，，，。，，。

【C1、C2、C3，】

C4.
Commonly used in high-salinity industrial areas, chemical areas, coastal areas, bridges, chemical plants, power plants, shipyards, sea ships, etc.
Its main application environment is high salinity and high humidity environment.

C5.

C5M has higher requirements.
It is commonly found in marine and high-salinity coastal offshore areas.
Environmentally speaking, it is a building with high humidity and high pollution, such as offshore drilling platforms and navigation towers.

The concept of water-based steel structure anticorrosive coating

Water-based steel structure anticorrosive paint is an environmentally friendly paint with water as the medium, and water-based steel structure anticorrosive paint is an environmentally friendly paint with water as the medium.
The water-based paint is non-toxic, environmentally friendly, odorless, with minimal volatiles, non-flammable and non-explosive.
It has the advantages of high safety, and it also has the characteristics of non-yellowing and large painted area.
As people's awareness of environmental protection increases, water-based paints will become more and more popular in the market.

The basic steps for the development of water-based steel structure anticorrosive coatings:

The first step: Evaluate the main film-forming material-resin.

Alkyd or acrylic can be used for C1C2C3, and epoxy or polyurethane can be used for C3C4.
C5 or C5M, the current water-based system is not up to it.

We use a wire rod, or a wet film preparer, a wet film preparer to make the resin into a dry film.
If there are defects in film formation, you can choose the corresponding film-forming assistant or co-solvent, and consider the compatibility of the co-solvent with the resin.

There are many types of film forming aids, such as ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, ethylene glycol phenyl ether, alcohol ester twelve and so on.
We have to choose additives with good compatibility according to our own resin characteristics.
After forming a complete paint film with film-forming additives and resin, test it on a steel plate or a metal machine.

Step 2: Choose flash rust agent.

The compatibility of flash rust agent and resin from different manufacturers is also different.
The first thing to test is the compatibility of the flash rust agent with its own resin.
After selecting the best flash rust agent, you can do some preliminary tests.

The third step: select wetting agent, leveling agent, defoamer

After the resin passes through the film-forming aids and flash rust agents, a complete paint film can be made.
At this time, the initial performance or basic performance of the resin can be tested.

It mainly includes the adhesion, impact, media resistance, water resistance, salt water resistance, acid resistance, alkali resistance, etc.
after the film or dry board is made.
This is the basic criterion for selecting resin.
There are hundreds of wetting agents and leveling agents at home and abroad.
This is also the most common job as an application engineer, that is, the screening of these additives.
After choosing the leveling wetting agent, it will generally bring some additional defects of its own at the same time, because the leveling wetting agent is more prone to bubbles.

   Defoamers generally include silicone oil, mineral oil, etc.
, and their performance has advantages and disadvantages.
Improper selection of defoaming agent will also cause many defects of the paint film.
Those with stronger defoaming ability will form shrinkage holes, and those with weaker defoaming ability will not eliminate bubbles, forming microfoams, pinhole bubbles, etc.
Therefore, the choice of defoamer is also a very important process.

The fourth step: the matching of the slurry.

In addition to resins and additives, water-based industrial paints have the largest content of pigments and fillers.

The general stability of water-based resins is relatively poor compared to oiliness, so there is usually a separate slurry plan, including powder, dispersant, wetting agent, defoamer, etc.

The choice of powder is also important, and there are many differences.
For example, talc powder has needle-like, juan mica flake-like, amorphous shape.
.
.
and according to the difference in oil absorption and performance, it needs to be matched with some anti-corrosion products.
Rust pigments, zinc phosphate, aluminum tripolyphosphate, etc.
Therefore, the slurry formula is actually to make a reasonable combination of the different properties, shapes, and oil absorption of the powder in your entire combination, so as to master the balance of the formula.

The fifth step: the choice of thixotropic agent.

 There are also many varieties of thixotropic agents, including some polyurethane, hydroxyethyl cellulose, attapulgite, and bentonite, all of which have a thixotropic effect.
The surface construction of many substrates is vertical or multi-sided, and the surface tension of water-based paint is different, so the requirements for thixotropic agents are relatively high.
The thixotropic agent should also be matched to the resin system we choose.

The basic steps for the development of water-based steel structure anticorrosive coatings:

1.
Cracking of the paint film is the poor film-forming property: it is generally the reason for the selection of film-forming aids or improper dosage.

2.
Regarding the materials added in the formula: the smaller the value, the more accurate the addition of the material, because the smaller the value, the greater the impact of the material on the finished paint.

3.
Partially unpainted: In fact, the main reason is poor wetting or oil residue on the substrate.

4.
Sagging: Generally, sagging occurs, mainly because the proportion of boiling water is too high, or the spray is too thick at one time.

5.
Regarding viscosity: add water to solve the problem of excessive construction viscosity.

6.
Shrinkage: Shrinkage is generally caused by excessive addition of defoamer or contamination by oil stains.