What Are the Different Types of Resin Coating?

Coatings that use synthetic resin as the main film-forming substance are called synthetic resin coatings. Synthetic resin coatings are based on petrochemical products, with many names and excellent performance, and have become the main varieties of modern coatings. In recent decades, due to the rapid development of the petrochemical industry, synthetic resin coatings have become the center of the coatings industry, accounting for more than 70% of the entire coatings output. ^[1]

Synthetic resin is a kind of artificially synthesized high molecular weight polymer. It is a resin that has or exceeds the inherent characteristics of natural resins. ASTM D883-65T defines synthetic resins as solid, semi-solid, or pseudo (quasi) solid organic substances with an unrestricted molecular weight but often high molecular weight. They tend to flow when stressed, often have a softening or melting range and when broken Shell-shaped.

In practical applications, it is often used synonymously with polymers and even plastics, especially referring to the basic materials produced by the polymerization reaction of the monomers without any additives or with only a small amount of additives. In addition, it is sometimes used to represent uncured flowable thermosetting polymer materials.

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In order to meet the requirements of coating manufacturing and construction technology, the synthetic resin for coating needs to have the following characteristics:

Good solubility or dispersibility in a dispersion medium for coatings.

Has excellent film-forming properties and specific coating film properties, such as gloss, fullness, hardness, elasticity, weather resistance, chemical resistance, etc.

It is miscible with other synthetic resins for coatings, so as to modify each other and improve coating performance.

The pigment can be properly wetted to facilitate the dispersion of the pigment in the coating.

Good storage stability.

The molecular weight is appropriate. For example, the molecular weight of synthetic resins for solvent-based cross-linked curing coatings is generally below 104, the molecular weight of synthetic resins for solvent-based non-conversion coatings is from 104 to 105, and the molecular weight for latex coatings is above 105.

Resin for electrodeposition coating should be charged and soluble in water.

There are many types of synthetic resin coatings, and there are usually two classification methods:

Classification by main film-forming substances

Each resin has its own characteristics.

Since the introduction of water-based coatings in the early 1960s, a variety of new (low) pollution-free, resource-saving, and energy-saving coatings have been developed. Among them, the following are the types with large output and wide application.

The first set: Encyclopedia of the latest foreign resin coating production technology patents (Chinese)

Composite particles and tread rubber, coating and resin composition prepared using the same (Japan-87 pages)

Production method of resin composition, boron-containing polymer, and antifouling paint (Japan-16 pages)

Method for producing resin composition for coatings (Japan-16 pages)

Coating material containing colored resin flakes, water-based coating composition containing resin flakes, coating material for forming colorful patterns, and flexible sheet-like surface decoration material (Japan-21 pages)

Preparation method of organic solvent-soluble composition of (meth) acrylic resin, and use of the composition as antifouling ship coating (France-9 pages)

Epoxy-functional polyester resin with higher molecular weight, preparation method thereof, and outdoor durable coating composition containing the same (Netherlands, page 17)

Epoxy-functional polyester resin, preparation method thereof, and outdoor durability coating composition containing the same (Netherlands, page 18)

Metal-containing monomer dissolved mixture, metal-containing resin, and antifouling coating composition (Japan-48 pages)

Coatings for improving resin dust resistance (US-20 pages)

Water-dispersible / redispersible hydrophobic polyester resin and its application in coatings (US-25 pages)

Amine-based curing agent, curable resin composition containing the curing agent, and anticorrosive coating composition containing the curing agent (Japan-19 pages)

Polyester resin composition, resin hardened material and coating (Japan-16 pages)

Vigorously develop high-grade synthetic resin coatings

Vigorously develop high-grade synthetic resin coatings, the proportion of which has increased from 70% to 80% in 2005. Develop energy-saving and low-pollution water-based coatings, high-solid coatings, powder coatings, solvent-free coatings, and radiation-curing coatings. Increase the proportion of latex coatings in architectural coatings to reach 60% -70% by 2005; expand the application of water-based coatings, high-solids coatings and powder coatings in industrial coatings; by 2005, increase the proportion of water-based coatings to 15% and powder The paint proportion reaches 10%.

Focus on the development of weather-resistant (more than 10 years) architectural coatings, such as organic, organic fluorine and its modified acrylic latex coatings, accelerate the research of waterborne and serialized automotive coatings, focusing on car paints, focusing on high decoration and low pollution Car paint, the development of water-based, high solids, solvent-free, metallic glitter paint and high freshness and other products.

Develop heavy-duty anti-corrosion coatings for bridges and ships with an anti-corrosive age of more than 15 years; develop fire-proof, sound-proof, high-temperature-resistant, heat-insulating coatings with special functions; develop various aliphatic and aromatic polyurethane coatings and rings with low energy consumption and high performance Oxygen resin coating.

Adjust the structure of inorganic pigment products, improve the grade, and develop high-grade titanium dioxide, non-toxic anti-rust pigments, super weather-resistant pigments, super-durable pigments and pearlescent pigments.

Synthetic resin coatings forbidden to use four types of coatings in Sichuan

Sichuan Province decided to ban and restrict the use of four types of architectural coatings from October 1, 2005. Prohibited architectural coatings are

Mainly composed of synthetic resin emulsion interior wall paint, also known as interior wall latex paint. Based on synthetic resin emulsion, it is formulated with pigments, extender pigments and various additives.

Main characteristics: The paint film has good water resistance, alkali resistance, scrub resistance, and mildew resistance. The colors are soft and easy to refurbish, making decorative walls look like new.

Main use: indoor and new wall painting of plaster, mortar, concrete and other materials.

Executive standard: GB / T 97562001

Basic parameters: a variety of suitable colors (refer to the color card)

Gloss: mercerized, soft, semi-gloss, matte

Drying time: surface drying 2h

Scrub resistance: 1,000 times for superior products, 500 times for first-class products, 200 times for qualified products

Theoretical paint consumption: 8 10m ² / kg / channel

Construction reference: Dilute with 10-20% water, stir thoroughly, brush, roller or spray. After construction, wash the tools with water. The construction environment requires that the temperature is not lower than 10 and the humidity is not higher than 85%.

Surface treatment: It should be smooth, smooth, dry and without cracks.

Recommended painting

Number of passes: 1 to 2 alkali-resistant primers, and then 2 to 3 inner wall emulsion paints.

Overcoating interval

Time: more than 2h (25 ° C, 50% relative humidity)

Matching paint: alkali-resistant primer

Shelf life: 6 months in a cool, dry place. Overdue can be inspected according to quality standards, and can still be used if it meets the requirements.

Note: Packaging specifications: 25, 6, etc.