What are the areas where waterborne coatings can be applied?

Water-based paint is a paint that uses water as a diluent and does not contain organic solvents.

Water paint has the characteristics of energy saving and environmental protection, non-flammable and non-explosive, ultra-low emission, low-carbon and healthy, and can be widely used in wood, metal, industrial coating , plastic, glass, building surface and other materials

Water-based industrial coatings are mainly used in automobiles, railway vehicles, bridge pipes, steel structures, containers and other fields

Used for: automotive coatings

With the rapid development of the automotive industry, the amount of automotive coatings is also increasing

The successful application of waterborne coatings in the automotive industry is mainly due to the following aspects:

First, water-based coatings are low-carbon and environmentally friendly

Second, the water-based paint itself has excellent performance

Third, water-based coatings are the main trend in the development of the automotive industry

Fourth, the application of water-based coatings can help reflect the social responsibility of automobile companies and enhance their corporate image
.
Water-based automotive coatings have good performance and are low-carbon and environmentally friendly.
They can not only improve the service quality and image of automotive companies, but also have positive significance for protecting the environment and help shape the image of companies taking social responsibility
.

Fifth, the application of water-based coatings provides a safer and healthier environment for auto painting workers
.
Water-based paints contain a lower proportion of harmful substances, helping to protect the health of painters
.

Used for: Railway Vehicle Coatings

Most of the body painting uses traditional solvent-based coatings, which contain a large amount of organic solvents, which brings inconvenience and safety hazards to storage, transportation and construction
.
The harmful gases released during the production and use of solvent-based coatings will have a negative impact on the health of production employees and the atmospheric environment that cannot be ignored
.
At present, the localization and water-based process of coatings in the fields of high-speed trains, high-speed railways and rail transit have entered the work plan of the General Railways
.

However, the following matters should be paid attention to in the use of water-based paint railway vehicles:

1.
Coating environment

The best state of the coating environment is room temperature, relative humidity below 70%, and gentle ventilation
.
Under this condition, the water can be quickly evaporated.
The temperature of the coating environment is lower than 10℃ or higher than 30℃, which will affect the coating effect, such as sagging, prickly heat, orange peel, air bubbles and other disadvantages
.

2.
Dealing with defects

Use a soft brush for brushing the sinker, which requires no shedding, softness, and strong water absorption.
Before use, remove the hair that is not firmly fixed, wash it with water, and shake it dry before use
.
Before the brush is dipped in the paint, it must be moistened with water in advance, but there must be no dripping water, otherwise the paint brush will dry and solidify quickly, or the paint in the paint brush will dry and slag, which will affect the quality of the coating film
.

3.
Spraying facilities and tools

Parts of the spray equipment that come into contact with the paint should be protected with stainless steel or with a Teflon lining, preferably without aluminum parts
.
Because water-based resins and additives in coatings may contain substances that can react with aluminum and aluminum alloys, these compounds can cause pitting corrosion, chalking, and paint contamination and discoloration on aluminum
.

4.
Pre-grinding treatment

The abrasive cloth used for sanding should not use abrasive cloth containing stearate, otherwise the residue of stearate after sanding may cause shrinkage cavities
.

5.
Preparation before using water-based paint

The paint liquid should be fully stirred before use, and the paint should not be mixed by shaking
.
In order to ensure the quality of the paint, the water-based paint must be filtered with a filter screen of more than 200 meshes before use
.

6.
Coating and film treatment of water-based paint

The number of coating passes depends on the quality and effect required by the product coating, and usually 2 passes can achieve good results
.
When high fullness is required, the number of coating passes should be increased, and the drying time should be appropriately extended to more than 4h
.
Before painting, the compatibility of the water-based paint and primer must be confirmed.
The oil-based system should be dried for at least 24 hours before applying the water-based paint.
Before applying the water-based paint, it should be fully polished and cleaned
.
Although the water-based paint surface dries quickly, it takes a long time for the water in the paint film to completely escape, usually after 7 days of drying to reach the final strength (the time should be appropriately extended in winter)
.

Used for: Heavy-duty anti-corrosion coatings

Corrosion and rusting of metal products can be seen everywhere in daily life, resulting in waste of resources, energy, economic losses, and sometimes even endangering personal safety
.
The development of environmentally friendly industrial heavy-duty anti-corrosion coatings is a high-tech project being actively explored by coating experts in many developed countries around the world, and it is an emerging field in China
.
The use of waterborne coatings is increasing in some typical heavy duty coatings markets such as infrastructure, oil and gas, power, barrel and tank, marine and chemical industries
.
There are water-based alkyd systems, water-based epoxy systems (epoxy micaceous iron primer and epoxy zinc-rich primer), water-based inorganic zinc-rich systems, and water-based epoxy ester systems used in the field of heavy anti-corrosion
.

The application of water-based paints in heavy-duty anti-corrosion paints is on the rise, such as infrastructure, oil and gas and power industries, as well as industrial tanks, marine and chemical industries
.
The best representative of water-based paint in the field of heavy anti-corrosion is water-based inorganic zinc-rich primer
.

Practical applications show that water-based inorganic zinc-rich primers can provide effective protection for steel under extreme conditions
.
Since water is their main solvent, water can also be used to wash and thin water-based paints
.
They have almost no solvent smell, and at the same time, the use of water-based paints can also bring lower costs to the user
.
Fast drying (saves time), low flammability (reduces insurance costs), less room ventilation (reduces energy consumption), and eliminates the cost of solvents and cleaning agents, using a single coat (eg a single coat) thick-film inorganic zinc silicate coatings), which saves downtime and scaffolding costs
.
With the water-based epoxy zinc-rich primer, epoxy micaceous iron intermediate paint, and acrylic polyurethane topcoat, which are the most widely used in the field of traditional anti-corrosion coatings, water-based anti-corrosion coatings have been able to handle most anti-corrosion conditions
.

Used for: Waterborne Container Coatings

At present, most of the container coatings used in the world are solvent-based.
During the process of container production and painting, a large amount of harmful gases will be generated, which not only endangers the health of painting operators, but also causes environmental pollution
.
With the increasingly strict environmental regulations, the International Committee for Standardization of Containers has put forward higher requirements for the environmental protection and hygiene of container coatings: such as heavy metals such as Cd, Pb, Cr, Hg, etc.
shall not be contained in the coating; non-toxic pigments such as phosphate shall be used; high solids , low VOC,
etc.
The replacement of chlorinated rubber topcoat with acrylic topcoat and the special paint for box bottom has also begun to be gradually promoted
.
Water-based container coatings have been piloted in China
.