CURRENT TYPES OF PAINT SOLVERS

What are the characteristics of the most common paint thinners on the market? Which solvent should be chosen the most suitable?

Which paint solvents are safe and popular today?

Paint solvents are often divided into different types to best combine with paint products. In which, the most common chemicals are straight-chain solvents, aromatic roots, ketones, alcohols, etc. Thanks to the solvents, the paint can maintain its fluidity during use, but the quality will change. exchange if not using the correct genuine product. Find out about paint solvents with Viet My Chemicals to get the right solvent.

The uses of paint solvents

The main use of paint thinners is the liquid used to dilute the paint during use. As a result, painting becomes easier and the volume of surface coating is increased. Besides, the solvent is often the substance that gives the ability to protect the beauty of the wall or painted material. The reason is because it has waterproof, mildewproof, anti-green moss or plaque that forms after a while.

In addition, these paint solvent chemicals are also used in many other industries. In which, the most popular is the leather shoe manufacturing industry, the glue or adhesive tape industry and the photography industry. Thus, in order to choose an appropriate solvent, it is best to pay attention to technical specifications, solvent quality and contact safety.

CURRENT TYPES OF PAINT SOLVERS

Acetone

Acetone is an organic chemical with the formula C3H6O or (CH3)2CO. The common characteristic of this substance is that it is in liquid form, capable of soluble in water and some other solvents such as ethanol, acetone, ethyl acetate, etc. In addition, acetone has no color, has a slightly sweet smell, and is very volatile. vapor and flammable when exposed to high temperature.

In fact, acetone is used as a solvent for various paints such as electrostatic paint, water-based paint, etc. Besides, this chemical is also used in the production of synthetic fiber or plastic products. In some industries, acetone is also used as a reducing agent for drugs, detergents or used in cosmetic products.

Sell ​​solvent BA

Semi-solvent trisolvent or butyl ethanote is an organic chemical with the chemical formula C6H12O2. The characteristic property of butyl acetate is that it is a clear, colorless, viscous liquid with a rather sweet taste like that of apples and bananas. This organic substance is very slightly soluble in water but mixes well with other solvents such as alcohol, glycol, ester, etc. And this is a very volatile liquid, very flammable even at room temperature.

The main cause of hearing fruit flavors is that butyl acetate is commonly found in many fruits. It can be said that butyl acetate is a chemical that plays an important role in the production of industrial paint solvents. Thanks to butyl acetate, the components in the paint are dissolved better than usual. And the drying process or surface effects are also simplified to create a uniform color and good gloss. However, care should be taken to avoid mixing butyl acetate with paint products with free OH groups.

Xylene

Xylene is a colorless, liquid chemical with a mildly sweet odor similar to butyl ethanote. This is also a chemical that has the ability to evaporate quickly and easily ignite at room temperature. In addition to being widely used in paint solvents, xylene is also present in the printing, tanning or rubber industry.

Thus, in order to choose the appropriate paint solvents, it is necessary to understand their characteristics to make sure they are suitable for the purchased paint product. However, the most necessary thing is still to buy the right genuine solvent, with clear origin and origin to ensure quality. Contact Viet My Chemicals to get more details!

Characteristics of solvents used in the paint industry

The characteristics of solvents used in the paint industry are:

– Quality characteristics

– Specification of specifications

– Characteristics of safety to use

1.Quality characteristics of solvents used in the paint industry:

          The properties of the solvent that affect the quality of the paint. In which there are 2 properties: Solubility and evaporation rate are the most important.

* Solvent solubility:

Is the effect of the solvent to separate the polymer molecule forming the film. Then disperse the strain in the solvents.

Solvent solubility in paint is determined by the viscosity of the resin solution. % solids contained in this solution. Painters tend to choose to use solvents as small as possible while achieving the lowest viscosity rates for paint fabrication and application.

The nature of the solvent is determined by its strong and weak solubility. Based on this solubility, solvents are classified into the following 4 types:

True solvents are also known as activated solvents. As a solvent used alone to dissolve paint resin.

LATENT SOLVENTS is not an activator solvent. Only used to wet paint resins – typically in NC resins – to avoid exposure to air.

Diluent-solvents are not activating solvents. Only mixed with the main solvent in order to reduce the cost of the solvent used in the required paint formulation.

Thinner solvents (THINNERS) are usually a mixture of solvents present in the paint formulation intended to reduce the viscosity of the paint according to the application requirements.

For example, about distinguishing solvents as follows:

Activating solvent: Straight chain hydrocarbons for aliphatic alkyd resins. Cyclic hydrocarbons for thin alkyd resins, Acrylic. Epoxy, Ketones for Vinyl, PU, ​​Acrylic. Ester for NC, Epoxy.

Latent: Alchols for NC.

Diluent: hydrocarbon used for most plastics.

Thinner: White Spirit for most Fat Alkyds.

* Evaporation rate of solvent

Evaporation rate, like solubility, is an important property of the solvent, reflecting the evaporation from the paint film during and after paint application.

The choice of solvent is usually based on the fast or slow evaporation of the solvent as follows:

Fast evaporating solvents have the following advantages:

+ Rapidly increases the viscosity and thus reduces the flow of the paint film when applied to vertical surfaces

+ Make the curing reaction of 2-component paint happen faster. Reduces foaming on the paint film.

Slow evaporating solvents have the following advantages:

+ Overcoming the disadvantage of solvents evaporating too quickly when spraying paint. (makes a poor paint film spread over the surface of the painted bridge).

+ Make the paint surface temperature not drop suddenly due to the solvent flying too quickly and moisture still clinging to the surface causing blistering or opaque paint film.

            Solvent Balance: As mentioned in the solvent evaporation rate. Both fast and slow evaporating solvents used in most paints have their own advantages and disadvantages. Therefore, paint manufacturers often mix these solvents together so that the paint film has the desired quality. In practice, it is common to mix the main solvent and the diluent. The appropriate mixing ratio is determined through specific experiments.

Characteristics of solvents used in the paint industry

2. Specifications of solvents for paint industry:

          It is imperative that suppliers and manufacturers of solvents inform users of their choice.

– Appearance (Appearance): quick identification of impurities: mechanics, color, turbidity….

– Bromine value: It is a factor that adversely affects the stored finished paint.

– Color value: Quickly identify impurities causing color in solvents.

– Density or specific gravity: accurately determine the type of solvent.

– Distillation temperature range: To determine the presence of impurities with high or low boiling point.

– Flash point: Determination of fire safety

– Purity: Determination of adverse impurities in the solvent.

eg: Secondary Butanol in MEK, Benzene in aromatic ring solvent, water in alcohol and Ester.

– Refractive index: Determined for each type of solvent.

Note: The above specifications are determined according to the ASTM standard

3.Safety characteristics of solvents used in the paint industry:

The safety of using solvents includes the following factors: Flash point, toxicity to humans through ingestion, inhalation, skin contact.

Solvent manufacturers and suppliers should notify users of these safety data using the following technique: MSDS (Material safety Data sheets) as required by regulations in Australia, the US or CHDS (Chemical Hazard Data Sheets) in Europe. Europe.

* Flash point:

It is the most important parameter that is related to a variety of problems such as: production, handling, transportation, and storage of products containing solvents.

Flash point is defined as the lowest temperature at which a solvent in contact with air can ignite in the presence of a spark or flame.

Often in some countries there is a law that prescribes safe thresholds for flash points for solvents that apply to transport and storage. Products containing solvents with a flash point above this safety threshold are considered to be conformable.

* Toxicity and environmental pollution: Including factors harmful to human health such as: respiratory, digestive, skin. Most commonly applied is the TLV “safety threshold value” index (=Threshold, Limit Value) for solvent concentrations in the plant atmosphere. The TLV index shows the average concentration (p.p.m = million VND). Do not exceed the safe threshold for human health in a working day.

4.Different quality characteristics of solvents used in paint industry:

The content of alcohol (-OH) and water (-OH) adversely affects the quality of PU paint.

Aromatic hydrocarbon content in low-aromatic solvent-based paints. Too much excess will change the solids/viscosity ratio and may cause the paint to have an unpleasant odor.

Bromine value present in Hydrocarbon solvents affects the color, odor and resin agglomeration of finished paints when stored.

The smell of solvents is especially important when applying paint in sensitive environments such as schools, hospitals, etc.

The color of the solvent can reduce the aesthetics of the paint film. Especially in the case of decorative varnish.

Surface tension affects the wettability of painted surfaces. Solvent surface tension with a low value is preferable because of its ability to penetrate paint easily into the edges of the painted surface.

The viscosity of the solvent has an effect on the speed and efficiency of paint grinding. At the same time, it also meets the conditions of paint construction.

Additives for paints

Types of solvents

Solvent

METHYL ETHYL KETONE (M.E.K)

TOLUENE, BAC, METHANOL

Butyl cellosolve Solvent (BCS)

When it comes to industrial solvents, people often think of industrial solvents used in mining or industrial solvents in the paint industry. In particular, each different type of solvent has different properties, advantages and limitations. In the following article, let's learn in detail about some industrial solvents used in the paint industry.

Paint industry solvents are chemicals commonly used in all paints from ordinary paints to special paints such as water-soluble paints, printing inks, dyes, varnishes, etc. These solvents are used to dilute or add other properties to the paint such as waterproof, anti-moss, anti-adhesive, or want to control the drying speed of the paint...

Toluene

Toluene is a paint industry solvent discovered in 1037 by two genius scientists, Ps. Pelletie and P.Walter. This industrial solvent was discovered during the preparation of turpentine. Toluene is a chemical that exists in the form of a transparent, low-viscosity liquid, slightly soluble in water but easily soluble in other industrial solvents such as ketones, acetone or alcohol.

Toluene is an aromatic hydrocarbon widely used in the chemical industry. It is often substituted for Benzene, because of its high solubility and volatility. In addition, Toluene is also used in the production of glues and adhesives. In addition, Toluene is also found as a main ingredient in detergents such as: dishwashing liquid, soap, washing powder, floor cleaner, toothpaste, facial cleanser, shower gel, toilet chemicals, solvents, etc. body hygiene products, makeup removers, laundry detergents... In the field of biology, Toluen is applied in cell processing technology and TNT explosives preparation.

However, the most important and prominent application of Toluene is as a solvent used in the manufacture of paints. Therefore, this chemical is most commonly known as a solvent in the paint industry. Due to some suitable physical and chemical properties, Toluene is often used to dissolve paint and paint household items such as car paint, furniture paint, ship paint, ... Few people know that Toluene is prepared from coal tar and petroleum by catalytic reforming (about 87%) or steam cracking. In addition, in some other cases, Toluene is prepared from Alkanes and Cycloalkanes in the laboratory…

Acetone

The next paint industry solvent is Acetone. This is a chemical used very commonly in industrial plants. Acetone exists as a colorless, transparent, extremely flammable liquid. Due to such physical properties, extreme care must be taken when using this industrial solvent Acetone.

Due to its very good solubility in water, Acetone is often used a lot in laboratory cleaning. This is also the main ingredient in some cleaning solutions such as nail polish remover, soap, dishwashing liquid, hand sanitizer, etc. In addition, Acetone is also used to dissolve a number of other organic substances. in the factory for preparation and production. In which, people know Acetone with the most common and important application as a paint solvent. It is used in the construction of architectural infrastructure by diluting paints or preparing varnishes in the field of home or interior decoration. This is one of the most commonly used industrial solvents in the construction industry.

Xylene

The next type of industrial solvent for paint industry is Xylene with the chemical formula C8H10. This chemical exists in liquid, colorless form.

Methyl ethyl ketone (MEK)

Methyl ethyl ketone is one of the paint industry solvents known quite commonly with the chemical formula C4H8O. Methyl Ethyl Ketone (MEK), or Butanone, is a colorless, liquid organic compound with an acetone-like odor. This chemical is soluble in water and is used as an industrial solvent. It is used in the field of industrial production on a rather large scale.