[Information of Tu Society] Why is it difficult to "change oil to water"?

Under the pressure of environmental protection policies, the external pressure of "oil-to-water" paint for steel structure production is also increasing.

During the "14th Five-Year Plan" period, the coordinated control of PM2.
5 and ozone is one of the key objectives of air pollution prevention and control.
The key is the coordinated reduction of nitrogen oxides and VOC.
In particular, VOC will become the main contradiction and shortcoming of governance.
board.

This means that, like many industries, the raw material end of the domestic steel structure industry is also facing the proposition of changing oil to water.
At present, the trend of upstream and downstream cooperation between steel structure companies and water paint companies is obvious.

Although many steel structure companies have included water-based paint in their centralized procurement list, after using water-based paint products, VOCs emissions have also been greatly reduced, but they still encounter some difficulties: 01 Cost concerns The unit cost of water paint is superficially higher than that of oily paint.
Paint, there are more cost concerns before the data is established, and it is difficult to make up your mind.

02Performance concerns Due to the short development time, there are concerns about unstable performance and immature formulations, resulting in a series of problems such as slow drying, sagging, and rust back after spraying, which will affect the delivery time.

03 Construction concerns The construction conditions of water-based paint are relatively strict, the humidity and temperature have a greater impact, and the construction process requirements are high.

First of all, in terms of cost control, although the price of water-based paint is slightly higher than that of oil-based paint, with the help of technological advances, the price gap has gradually equalized.

At the same time, the use of oil-based paint construction requires much higher capital investment in equipment maintenance and hazardous waste and solid waste management.
Therefore, when the amount is similar, the cost of water-based paint and the discharge of hazardous waste and solid waste are much higher.
The amount is much lower; the use of paint for construction, during the environmental protection and safety inspection period, may also be subject to administrative impacts such as complaints, suspension of production, and rectification.
These hidden losses are also very costly for the company.
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As for performance, the current water-based steel paint can have a surface drying time of less than 15 minutes under a construction environment of 20°C, and no more than 10 minutes under a construction environment of 25°C or higher.

In the field of long-lasting heavy anti-corrosion, water-based paint can also be used for supporting coating, usually water-based epoxy zinc-rich primer + water-based epoxy mica intermediate paint + mid-end water-based acrylic, polyurethane anticorrosive topcoat or high-end water-based fluorocarbon surface Lacquer painting scheme.

Now, many properties of water-based steel paint have surpassed traditional solvent-based paints.

In terms of construction, pay attention to the following points when changing oil to water, so you don’t have to worry about the problems of sagging, slow drying, and rust return mentioned above: 1.
The spray gun and the conveying pipe must not be mixed with water and oil, and must be water-based.

If you need to spray water-based paint with equipment that has been sprayed with oil-based paint, first use oil-based thinner to thoroughly clean the sprayer, spray gun and pipeline system (to achieve colorless and transparent paint mist).

2.
Use special water-based paint and special gun washing water to clean the entire system (sprayer, spray gun, pipeline) in the same way to ensure that the sprayed paint mist has no solvent smell.

3.
Use tap water to clean the entire sprayer, spray gun and pipeline again (the paint mist sprayed on the palm of the hand is odorless, dry and non-sticky).

4.
When spraying water-based paint, if the sprayed water-based paint film has a small amount of shrinkage or shrinkage in the early stage, and then disappears later, it means that there is still a trace of oily solvent remaining in the entire system.
Continue spraying, and spray to cover after drying.

5.
The amount of water added in autumn and winter (weight ratio) is 5-8%, and the amount of water added in summer does not exceed 10-13%, and the thickness of the paint film is controlled to be >40μm.

The diameter of the nozzle is 0.
4-0.
5mm, and the spraying pressure is 3.
5-4.
0MPa.
6.
The water paint must be fully stirred before use, and the paint bucket must be cleaned after use and placed in the designated position.

The implementation of "oil-to-water" is not as simple as surface conversion to water-based paint and spray equipment upgrades.
It involves the specific operation details of "oil-to-water conversion".
It is impossible to get on the right track in a short time by relying solely on water-based paint manufacturers or coating companies themselves.
This requires in-depth docking between the two parties in order to shorten the process of "oil-to-water".