Water-based paint tips!

Water-based paint, including water-based wood paint, is a paint that uses water as a dispersion medium and diluent

Unlike solvent-based coatings that are not commonly used, their formulation system is a more complex system

Sometimes some special additives are selected according to special requirements, and finally a suitable formula is formed

01 The basic composition of the formula

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.
Filler: Mainly used in putty and solid color paint to increase solid content and reduce cost
.

13.
pH adjuster: adjust the pH value of the paint solution to stabilize the paint solution
.

14.
Wax emulsion or wax powder: improve the scratch resistance of the paint film and improve its feel
.

15.
Special additives: additives added to the special requirements of water-based paint, such as anti-rust agent (iron cans packaging to prevent premature rust), hardening agent (increasing the hardness of the paint film), matting agent (reducing the gloss of the paint film), Anti-scratch agent, slip agent (to improve the feel of the paint film), anti-blocking agent (to prevent the coating from overlapping and blocking), cross-linking agent (to make a two-component paint to improve overall performance), water repellent (to make the coating Has the lotus leaf effect), anti-wear agent (increase the wear resistance of the coating), ultraviolet absorber (outdoor paint anti-aging, prevent yellowing) and so on
.

16.
Ionized water: In formula design, a small amount of deionized water is often added to make paint
.

02 Water-based colorful paint formulation design skills

 ▲ Basic paint

1.
Cellulose is the key to the gel system and must be added;

2.
Protective glue helps to form an internal "card house" structure and improve the toughness of colorful particles;

3.
The viscosity of the base paint affects the rough shape, and VS affects the flatness of the paint film;

4.
Surface active material can effectively moisturize the "card house" structure, and TSPP reduces viscosity (it can be considered as structural wetting);

5.
Emulsion with poor compatibility with protective glue, the particles are easy to swell and have poor water resistance;

 ▲ Granulation 

1.
An appropriate amount of protective glue will help the particles form a "card house" shell and avoid secondary aggregation;

2.
After the whole TSPP enters, the protective glue will not separate out, thicken, and particles will re-aggregate
.

 ▲ Color matching, paint making 

1.
Emulsion with poor compatibility with protective glue, the colorful paint will gelatinize and become thick after pseudoplastic;

2.
Thickeners with strong polar cationic groups are easy to cause thickening after colorful paint;

3.
Jinming emulsion is beneficial to improve the opening effect and second repair application;

4.
The KU of the colorful paint is around 90, and the large particles can also be adjusted to 100-120
.

03 The main points of the production and preparation of water-based coatings

Water-based paint is a kind of paint that uses water as solvent.
It has been gradually recognized as a substitute for solvent-containing paint systems.
In recent years, because the ideal water-based paint has no pollution to the human ecological environment and is It has certain advantages in performance, and its products are quickly accepted by the market and are called high-tech replacement products
.

The following briefly talk about the main points in the preparation of water-based coating production process:

1.
The formulation materials should use pigments and ultra-fine fillers with good dispersibility as much as possible, so that under the premise of stably improving product quality, grinding operations are eliminated, the production process is simplified, and the production efficiency is improved;

2.
In the early dispersion stage, you can put in a proper amount of HEC in advance, which not only helps dispersion, but also prevents or reduces the phenomenon of slurry sticking to the wall and improves the dispersion effect;

3.
Before adding the liquid thickener, try to dilute it with 3~5 times of water, and then slowly add it under full stirring to prevent the local thickener from being too high to cause the emulsion to clump or form micelles.
Thickener It can be put into the slurry after being dispersed and stirred fully to avoid the above problems;

4.
Half of the defoaming agent is added to the slurry, and the other half is added to the paint mixing process, which can make the defoaming effect better; during the paint mixing process, the stirring speed should be controlled at 200~400r/min.
Prevent the introduction of a large number of bubbles in the production process, which affects the quality of the coating
.