Is varnish water separating and oil based? What are the characteristics of each?

Yes, varnishes are divided into watery and oily.

Features of water-based varnish include:

1.It uses water as a solvent and does not contain volatile organic compounds (VOCs), which is harmless to the environment and human health.

2.The drying time is short, and it is durable and decorative.

3.It can be used for the protection and decoration of furniture, wood products, flooring and steel surfaces.

4.It does not require much ventilation when used.

Features of oil-based varnish include:

1.Varnishes that use organic solvents as solvents contain high VOCs and are highly volatile, which may affect indoor air quality and human health.

2.Fast drying, high transparency, strong brightness, widely used in furniture, wood products and metal surface protection and decoration.

In summary, waterborne and oil-based varnishes each have their own characteristics and uses, and the choice of which type of varnish to choose depends on the specific application needs and environmental requirements.

Water-based varnish – hydrophilic.

Before drying, it can be diluted and washed with water. It is mostly used for indoor walls and dries quickly (it is no longer hydrophilic after drying).

Ordinary varnish - not hydrophilic, mostly used for low-grade wooden furniture. It is also used for metal furniture topcoat and metal rust prevention, both indoor and outdoor.

Yes, water-based and oil-based are directly diluted with water, while oily ones need to be as such.

Heavenly water. Dilution, both have their own benefits, water-based without oily wear-resistant can not do outdoors. I have various natures.

Varnish. You can find me.

From a practical point of view, water-based protective agents are not resistant to acid and alkali, and the protective effect on cement is almost non-alkali (will be anti-alkali), and some marble performance is particularly outstanding (such as Egyptian beige), and oil-based protective agents will be relatively better.

The use of water-based varnish on gravure printing machine is more convenient than that of general solvent-based varnish, mainly to control the viscosity of the varnish, the depth of the anilox roller and the temperature of the oven.

1) Environmental protection and safety of water-based varnish. Water-based varnish uses water as the dispersion medium, which can be diluted with water during the printing process, and the equipment is cleaned with water, which will not produce harmful gases containing aromatic hydrocarbons, is not easy to burn and is very safe for production and storage. Solvent-based varnish can be divided into aromatics and alcohols.

Due to the large amount of benzene harmful substances, aromatic hydrocarbon varnish will seriously damage the health of the operator and pollute the environment during the printing process, and it is flammable and explosive; The alcohol varnish is relatively less toxic, but it also has the problem of flammability and explosiveness, and the safety problems in the production process are more prominent.

2) Water-based varnish equipment adaptability. Water-based varnish is mainly composed of water-soluble resin and water-dispersible resin, and the viscosity of the varnish can be flexibly adjusted by changing the ratio of the two. This characteristic of water-based varnish makes it possible to adapt to the requirements of almost all printing equipment.

Water-based varnish is volatile drying type, and infrared, hot air and other drying devices can be used for drying water-based varnish. Solvent-based water-based varnish exists in the form of resin solution, with a small range of viscosity adjustment and poor adaptability to equipment.

First, the type of varnish.

Varnish UV varnish is mainly composed of oligomers, reactive diluents, photoinitiators and other additives.

1) Oligomers.

Oligomers, also known as prepolymers, are the most basic components of UV varnish. It is a film-forming substance, and its properties are solid.

The chemical process and the nature of the curing film play an important role. From a structural point of view, the oligomers are all unsaturated double bonds containing C=C.

Most of the low-molecular-weight resins are acrylic resins.

2) Reactive diluent.

Also called cross-linked monomer, it is a functional monomer. Its role in varnish is to adjust the viscosity and curing speed.

and curing film performance.

3) Photoinitiators.

Photoinitiators are active intermediates that can absorb radiant energy and undergo chemical changes to produce active intermediates with the ability to initiate polymerization.

is the main ingredient required for any UV curing system.

4. Additives. It is used to improve the performance of inks. The additives commonly used in UV varnish are:

1) Stabilizer is used to reduce the occurrence of thermal polymerization during storage and improve the storage stability of varnish;

2) Leveling agent is used to improve the leveling of the glazing film surface, prevent the occurrence of shrinkage porosity, and also increase the glazing.

gloss of the coating;

3) Defoamer is used to prevent and eliminate bubbles generated by varnish during manufacturing and use.

2.Water-based varnish.

Water-based varnish is composed of synthetic resin and water, which is composed of 45 synthetic resin and 55 water.

1) Main agent: film-forming resin, the film-forming substance of the glazing agent is usually a synthetic resin that affects drying, adhesion, and light.

Ze, and other qualities of the glazing.

2) Adjuvant:

1) Curing agent, improve the film-forming property of the water-based main agent, and enhance the poly-strength of the film-forming degree;

2) surfactant, reduce surface tension and improve leveling;

3) Defoamer, control foaming, needle eye, orange peel, pitting;

4) Desiccant, increase the speed of varnishing and drying, and improve the adaptability of printed products;

5) Adhesion promoter to improve the adhesion of varnish prints;

6) Wetting and dispersing agent to prevent stickiness and improve wear resistance;

7) Plasticizer to improve folding resistance.

3) Solvent: disperse and dissolve synthetic resin, additives, the main component is water (can add a certain amount of ethanol to improve.

drying properties).

Second, the drying of varnish.

Generally speaking, drying is mainly equipped with ultraviolet drying, infrared drying, cooling and exhaust.

2.Water-based varnish drying mainly uses infrared rays and hot air drying.

1. Environmental protection and safety.

Water-based varnish uses water as the dispersion medium, which can be diluted with water during the printing process and cleaned with water, so that it will not produce aroma.

Hydrocarbons are harmful gases, not easy to burn and **, and are very safe to produce and store.

2. Glossiness.

1) The gloss of water-based varnish coating is low, on the one hand, due to the slow volatilization rate of water molecules, which is easy in the process of water volatilization.

Make the coating film uneven;

On the other hand, the presence of emulsion-like resin particles in water-based varnish makes the surface flatness of the coating film.

affected. In order to improve the gloss of the water-based varnish coating, on the one hand, the particle size of the emulsion should be reduced as much as possible to make the flatness of the coating film corresponding.

Improve. In recent years, with the development of microemulsion polymerization technology, the luster of water-based varnish has been continuously improved. On the other hand, it can be used.

A small amount of high boiling point solvent is added to the water-based varnish to moisten the emulsion particles and promote the formation of a coating film with good flatness.

After the above improvements, the gloss of the water-based varnish coating can be achieved.

More than 90%, it is close to UV

Coating of varnish light.

Ze level, which can meet the requirements of general high-gloss products.

2) In the field of matte and matte products, one way to make the coating film achieve the effect of matte or matte is in the varnish.

Add matting agent;

Another approach is to use two immiscible resins in the same system.

In aqueous varnish, the resin exists in the form of an aqueous dispersion, which creates conditions for the existence of two immiscible resins in the same system.

The ratio of resins can flexibly adjust the gloss of the product, so as to achieve a matte or no effect.

It can be said that in matte,

In the field of matte glazing, water-based varnish has unique advantages.

3) Water resistance.

In the water-based varnish system, due to the presence of a large number of carboxyl groups in the water-soluble resin and the influence of the hydrophilic properties of the emulsifier in the emulsion.

The waterproofness of water-based varnish was once restricted.

In recent years, with the advancement of emulsion-free polymerization technology and functional hydrophobicity.

With the advent of additives, water-based varnish has been greatly improved in terms of waterproof performance, which can meet the requirements of general printing for waterproof performance. 4

Smoothness of glazing products.

Due to the emergence of a large number of water-based coating slip additives, the slip problem of water-based varnish has been completely solved, and its performance in terms of smoothness of printed matter is no less than that of any solvent-based products.

3. Equipment adaptability.

Water-based varnish is mainly composed of water-soluble resin and water-dispersible resin, and the ratio of the two can be flexibly adjusted.

The viscosity of the varnish.

This characteristic allows water-based varnish to adapt to the requirements of almost all printing equipment.

Water-based varnish. It is a volatile drying type, and infrared and hot air drying devices can be used for drying water-based varnishes.

Water-based varnish is mainly divided into three types according to the use of the product: high gloss, ordinary gloss, and matte luster.

From the processing technology, it can be divided into: ink fountain glazing process, water bucket glazing process (using the water and ink fountain of ordinary offset printing machine), special glazing machine glazing process, and online glazing process.

Water-based varnish can eliminate the harm to the human body and the pollution to the environment in operation, and has been paid more and more attention by food and tobacco printing enterprises.