Talking about steel drum coating (2)

Talking about steel drum coating (2)

Shanghai Xugong Coating Technology Co., Ltd. Xu Guoxing

9. Perchloroethylene lacquer

Perchloroethylene lacquer is a coating material in which perchloroethylene resin is the main film-forming material.

The characteristics of this type of paint are:

1 Dry faster, dry for about 2 hours

2 has good atmospheric stability, climate resistance is better than alkyd paint

3 has excellent chemical stability. It can withstand 25% sulfuric acid, nitric acid and % caustic soda solution at room temperature for up to several months. For alcohol. The stability of the medium such as lubricating oil, oxygen and ozone is also very good;

4 paint film is water resistant and has good antibacterial properties;

The disadvantages are:

1 poor adhesion, easy to release film when construction is not correct:

2 solvent release is poor;

3 The gloss of the paint film is slightly worse, the hardness is not as good as that of the nitrocellulose lacquer, so the polishing and polishing properties are poor;

4 poor heat resistance, decomposition temperature 145 ° C, use temperature below 60 ° C

5 low solid content, requires multiple construction.

Perchloroethylene lacquer is a kind of volatile lacquer. Its manufacturing, construction, drying and other aspects have many similarities with nitrocellulose lacquer; however, its performance (such as three-proof performance) is superior to that of nitrocellulose lacquer, and it is widely used because of its wide source of raw materials, low price, and great significance for popularization and application. Transportation, agricultural machinery, machinery, wood, paper, etc. However, due to poor adhesion, it is not suitable for use as steel drum coating.

10, vinyl resin paint

The vinyl resin paint is a paint made of a polymer resin obtained by bulk polymerization or copolymerization of ethylene and a derivative thereof containing a double bond. , such as polyvinyl chloride / polyvinyl acetate, polystyrene, polyvinyl fluoride and other resin coatings

The characteristics of this type of resin paint are:

1 paint film is flexible;

2 The color of the paint is light and not easy to yellow;

3 resistant to wear;

4 good chemical resistance;

5 fluorine resin paint can withstand high temperature and corrosion resistance.

weakness is:

1 paint film has poor solvent resistance;

2 The solid content in the paint is low;

3 varnish is not resistant to ultraviolet radiation.

The use of such paints varies depending on the film forming material. For example, polyvinyl chloride resin paint can be used for surface coating of polyvinyl chloride plastic products; vinyl chloride-vinyl chloride resin paint can be used for metal, concrete surface of buildings, leather or rubber fabrics, etc.; vinyl chloride tetraacetate copolymer resin paint It can be used for chemical corrosion resistance, seawater-resistant structures and various parts of ships; polyvinyl acetate paint is used in the construction sector; polyvinyl acetal paint can be used as enameled paint; divinyl acetylene resin is used as anti-corrosion Corrosive coatings, waterproof coatings, anti-rust paints for ships, etc.; polyvinyl fluoride coatings can be used as anti-chemical corrosion coatings; the latter two coatings can be used as internal coatings for steel drums, but polyvinyl fluoride coatings are not resistant to polarities. Solvent.

11. Acrylic resin paint

Acrylic paints are generally made from copolymers of methacrylate and acrylate derivative monomers. These resins have a wide range of physical properties, such as rubber, and the elongation of the resin can be more than 10 times; A saw can be used, such as plexiglass (scientific name: polymethyl methacrylate). The thermoplastic resin and the thermosetting resin lacquer may be classified according to the nature of the monomer at the time of synthesis. The lacquer made of a thermoplastic resin is dried to form a film at a normal temperature, and the thermosetting property is baked to form a film.

The characteristics of this type of paint are:

1 resin color is light, can be made of light or white paint;

2 bright color, with excellent gloss and color retention;

3 heat resistance is good;

4 Good chemical resistance, outstanding anti-humidity, anti-salt spray, anti-fungal performance and water resistance;

5 can be made into high hardness, good wear resistance paint.

The disadvantages are:

1 thermoplastic film has poor solvent resistance;

2 thermosetting paint film is easy to be brittle after curing at high temperature;

3 When spraying, it sometimes produces low light, brushed and orange peel. The cost of using acrylic lacquer alone is high.

Acrylic paints are mainly used in industrial and civil sectors that require strong decorative feel and high weather resistance, such as automobiles (mainly cars), aviation, medical equipment, instrumentation and high-end furniture.

12. Polyester resin paint

The lacquer is a coating material in which a polyester resin is a main film-forming material. Both saturated and unsaturated polyester paints are available. The main varieties of saturated polyester paints are oil-modified polyester resin paints, commonly referred to as alkyd resin paints; unsaturated polyester resin paints are collectively referred to as polyester resin paints.

The advantages of unsaturated polyester resin paint are:

1 can be cured at room temperature or heat;

2 no solvent, a thicker coating can be obtained at one time;

3 The coating film has high hardness, good wear resistance, gloss retention and good color retention;

4 has a certain heat resistance, cold resistance and temperature resistance;

5 has a certain resistance to weak acid, weak base, solvent and other properties.

The disadvantages are:

1 adhesion to metal is poor;

2 The paint film is brittle and the stability of the paint is poor.

The main varieties of unsaturated polyester paints are varnishes and insulating varnishes for use on wooden surfaces and impregnated coils.

13. Epoxy paint

A coating made of epoxy resin as the main film-forming material.

The characteristics of epoxy resin are:

1 strong adhesion. The resin contains polar hydroxyl and ether bonds, which can form chemical bonds with free bonds on the metal surface, so it has good adhesion and adhesion to metals, glass, ceramics, plastics, wood, cement, paper, fabrics, etc.

2 resistant to chemical corrosion, especially alkali resistance, and has good resistance to water, solvents, acids and other chemicals;

3 insulation performance is good.

The disadvantages are:

1 The adhesion to other resin paint films is not good;

2 powdering fast, poor gloss retention;

There are many varieties of epoxy resin paint, which can be divided into three types:

1 solution type. The solution type epoxy resin paint has various kinds of curing agents, such as a cured epoxy resin, a phenolic resin crosslinked, and an amine resin, which are cured by an amine and an amine adduct.

2100% solid or solvent-free paint. There are solid and liquid coatings. A curing agent is added during use, and when the viscosity is too large, a reactive diluent can be added. Commonly used reactive diluents are phenyl glycidyl ether or butyl glycidyl ether. The solid epoxy resin paint is composed of a powder resin, a pigment curing agent and the like, and is a very fine powder, which is called a powder coating;

3 esterified epoxy resin paint, also known as epoxy ester paint. The paint is formed by reacting vegetable oleic acid with an epoxy resin. It does not need to add curing agent when used, and the stability of the paint liquid is good. The water resistance and chemical resistance of the paint film are not as good as the above two paints, but it is better than the alkyd paint.

Most of the epoxy coatings currently used in the steel drum industry are solution-type epoxy baking varnishes crosslinked with phenolic resins, and two-component curing with amines and amine additions or isocyanates. Normal temperature smoked paint. The production process of such coatings is relatively simple, and the equipment investment is also small, so it is also more suitable for the steel barrel industry to manufacture itself. The raw material cost of this type of coating is about 16 yuan per kilogram.

14. Polyurethane paint

Polyurethane paint is an abbreviation for polyurethane. A coating containing a urethane as a main film-forming substance formed by reacting a polyisocyanate with a polyhydroxy compound.

There are many varieties of polyurethane paint. There are:

Polyurethane oil. It is an alcoholysis product of a diisocyanate and a vegetable oil;

2 moisture-curing polyurethane. It is an end-group isocyanate addition polymer prepared by reacting a diisocyanate with a polyether triol or a polyester polyol, and is a one-component white dry type coating;

3 closed polyurethane. It is a coating made of diisocyanate with phenol or other blocked compound and polyhydroxy component. This lacquer is characterized by the temporary encapsulation of active isocyanates, eliminating the toxicity of isocyanates;

4 Catalytic polyurethane, is a two-component coating: component one is a prepolymer of diisocyanate, such as toluene diisocyanate and castor oil and glycerol alcohol ester (sometimes added epoxy resin); component two is a catalyst, such as Amines, organic tins. This coating is also a moisture curing type.

5 polyhydroxy polyurethane, is a two-component coating: component one is a binary or ternary isocyanate adduct; component two is a polyhydroxy compound such as polyester or polyether containing free -OH.

The common features of polyurethane paint are:

1 paint film is hard and wearable;

2 has excellent chemical resistance;

3 has good oil and solvent resistance;

4 the paint film is bright and full;

5 has good heat resistance and adhesion.

The disadvantages are:

1 gloss retention, poor color retention;

2 During the construction, the paint is easy to foam. Multi-packaged component paint, troublesome operation, high demand;

3 isocyanate volatilization has a strong stimulating effect on the human body.

These types of paints are used in a wide range of applications, such as petrochemical, electromechanical and other industrial sectors. The materials that can be coated include non-metallic materials such as metal, rubber, wood, leather, fabric, and plastic.

15. Elemental organic paint

Elemental organic polymer paint is referred to as elemental organic paint. It includes organic organic polymers such as silicone, organotitanium and organoaluminum. The most commonly used elemental organic paint is a coating with a silicone polymer as the main film-forming material.

The characteristics of silicone resin paint are:

1 excellent heat resistance;

2 insulation performance and water repellency;

3 cold resistance is good;

4 chemical resistance and mildew resistance.

The disadvantages are:

1 It is not easy to cure into film at normal temperature;

2 poor gasoline resistance;

3 parts of the paint film is easy to be brittle;

4 the price is more expensive.

This type of paint is mainly used for the application of heat-resistant or insulating parts.

16. Rubber paint

The rubber paint is a paint mainly composed of a rubber derivative or a synthetic rubber.

Its characteristics are:

1 coating drying fast;

2 chemical resistant;

3 paint film is flexible and wear resistant;

4 good aging resistance;

5 Construction is not affected by the season;

6 water resistant, low water vapor permeability.

The disadvantages are:

1 paint film is easy to change color;

2 varnish is not resistant to ultraviolet light;

The 3 parts of the variety have a low solid content.

The main types of rubber paint are chlorinated rubber paint, neoprene paint and so on. The chlorinated rubber paint remained intact after being immersed in 95% sulfuric acid, 35% hydrochloric acid, 5% caustic soda, 20% saline solution for two weeks. When the chlorine content is above 62%, the paint is not easy to burn, and the fireproof paint can be made. Chlorinated rubber paints are widely used in ship primers, deck paints, cargo tank paints, acid and alkali paints, etc. Neoprene has excellent water resistance, wear-resistant shed exposure, acid and alkali resistance, humidity resistance (such as high temperature resistance up to 93 ° C, low temperature resistance -40 ° C), widely used in ships, chemical plant production equipment, cement, etc. . It can also be used as a paint for exterior steel drums, but the gloss is not very good.

Five, a variety of coating performance comparison

Types of coatings Advantages Disadvantages 1, grease paint Good resistance to atmospheric; cheap; good brushing performance; good permeability. Slow drying; soft coating film; poor mechanical properties; large water swelling; can not be polished; not alkali resistant. 2, natural resin paint dry than grease paint faster; short oily film is hard and polished; long oily film is flexible, good atmospheric resistance. Poor mechanical properties; short oil resistance to atmospheric; poor oil paint can not be polished, polished. 3, phenolic resin paint Hard coating film; good water resistance; pure phenolic chemical resistance is good; has a certain dielectric strength; good adhesion. The paint film is brittle; the color is easy to become deep; the atmospheric resistance is worse than the alkyd paint; it is easy to be powdered; 4, asphalt paint resistance to moisture, water resistance; cheap; chemical resistance; a certain dielectric strength; good blackness. Color black; can not make light paint; unstable to sunlight; dry and not smooth. 5, alkyd paint, good gloss; excellent weather resistance; good construction performance, can be brushed, sprayable, can be baked; good adhesion. The coating film is soft; it is poor in water and alkali resistance; the drying is slower than the volatile paint; it cannot be polished. 6, amino paint coating film is hard, can be polished and polished; good gloss fullness; light color, not easy to yellow; good adhesion; have certain heat resistance; good weather resistance; good water resistance. It needs to be baked at high temperature to cure; baking too much film is easy to be brittle. 7, nitrocellulose paint is fast drying; oil resistant; hard coating film; 'can be polished and polished. Flammable; varnish is not resistant to UV light; can not be used at temperatures above 60 °C; low solids. 8, cellulose paint resistance to atmospheric: good color retention; can be polished; individual varieties of heat, alkali and insulation. Poor adhesion; dampness and shame; high price. 9, perchloroethylene paint Excellent weather resistance; excellent chemical resistance; water, oil and fire retardant; good three-proof performance. Poor adhesion; poor polishing and polishing; can not be used above 70 °C; low solid content. 10, vinyl paint has a certain flexibility; light color; good chemical resistance; good water resistance, poor solvent resistance; low solids. Carbonized at high temperatures; varnish is not resistant to UV rays. 11, acrylic paint, light color film; good color retention; excellent weather resistance; certain chemical resistance; good heat resistance. Poor solvent resistance; low solids. 12. Polyester paint High solid content; resistant to certain high temperature; abrasion resistant, capable of polishing; good insulation. Dryness is difficult to grasp; construction methods are more complicated; adhesion to metals is poor. 13, epoxy paint, strong adhesion, alkali resistance, solvent resistance; good insulation properties; coating film tough. Outdoor exposure is easy to powder; poor gloss retention; darker color; poor appearance of the film. 14, polyurethane paint, strong wear resistance; good adhesion; moisture, water, heat, solvent resistance; chemical and petroleum corrosion; good insulation. The coating film is easy to be powdered and yellowed; it is sensitive to acids, alkalis, alcohols, water, etc.; it has certain toxicity. 15. Silicone paint is resistant to high temperature; excellent weather resistance; moisture resistance, water resistance; good insulation performance. Poor gasoline resistance; hard and brittle coating film; generally need to be baked and dried; poor adhesion. 16, rubber paint, strong chemical resistance; good water resistance; wear resistance. Easy to change color, varnish is not resistant to ultraviolet light; poor solvent resistance; complex construction of individual varieties.

of course! The properties of various coatings can be improved by modification of the resin or by crosslinking or mating with other resins. If 38% chlorine vinegar copolymer resin is mixed with nitrocellulose and other resins, it can enhance the chemical resistance and durability of the lacquer. The epoxy resin cured epoxy resin can make the amino resin lacquer have good gloss and weather resistance. Good to bond with the chemical resistance of epoxy resin, and so on.

Sixth, the basic performance of steel drum coating

The most basic properties that should be available as a paint for steel drums are:

1. Strong adhesion to steel drum substrates. This performance is the most basic requirement for steel drums.

2. Excellent resistance to aging and weathering. Steel drums need to be exposed to the open air for a long time, and they are exposed to the sun and rain, and the heat is cold. This performance is also required.

3. Good abrasion resistance and impact resistance. As a package, steel drums must be collided and rubbed during transportation, loading and unloading and stacking. Only steel and barrels can be protected if they have good wear resistance and impact resistance.

4. Has a certain degree of corrosion resistance. The contents of the steel drum and the working place are complicated. If there is no good anti-corrosion performance, it is impossible to protect the steel drum.

5. Bright color. This performance is a lot of paint that can be done and is easy to understand. In combination with the above various properties, compared with the better steel drum outer coating, and the price performance ratio is also the best should be amino alkyd baking paint.

The most basic performance that should be possessed as a steel drum inner coating should take into account the manufacturing process of the steel drum. Because the construction of the inner coating of the steel drum is generally carried out before the top and the top of the bucket, the paint inside the steel drum should first be able to withstand the curl and be intact. Therefore, the following performance should be achieved:

1. Same as steel drum paint.

2. Good flexibility. Since the coating in the steel drum is applied before the bottom of the steel drum and the top of the barrel, it needs to be rolled up after coating. If the flexibility is good, the coating will be prone to crack during the winding process. The effect of the paint should be there.

3. Has a certain mechanical strength and wear resistance. As a coating in steel drums, the flexibility must be combined with a certain mechanical strength of the Mengding, and it can withstand collision and friction with the contents.

4. The anti-composite medium has strong corrosion resistance. This performance can also be changed to a specific resistance to certain media corrosion (because some steel drums are limited to filling a small number of media), such as 2126 phenolic. Drying paint; limited to some acidic liquids, lacquer enamel chelating paint, etc.

Of course, the choice of steel drum coating should also take into account various factors. If some coatings need to be used with the primer; some coatings require multiple layers of construction; some coatings require specific construction conditions and so on.

In combination with the above internal coating properties, the coatings in the steel drum with better price performance are epoxy phenolic drying anticorrosive paint, epoxy two-component paint and fluorine-containing paint.

With the continuous development of science and technology, new varieties are emerging, more and more varieties suitable for steel drum coatings, performance is getting better and better, and there is more and more room for us to choose. Steel drum coatings will be better and better as our steel drums, and our steel drums will be more beautiful and more durable.

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