What are the main flaws of paint?

There are three main types of paint defects:

1. The defects generated during the painting operation include bubbles, whitishness, sagging, and bottom biting;

2. The defects on the dry film after coating are mainly pinholes, shrinkage holes and orange lines.

color difference, discoloration, not drying, brush marks and unclear wood grain, etc.;

3. The defects that may occur in the coating film during the use of furniture include color cracks, permeability, peeling and white spots.

Wait. Paint is a chemical mixture coating that can firmly cover the surface of objects for protection, decoration, signs and other special purposes. The authoritative book "Coating Technology" in China's coating industry is defined as follows:

Paint is a material that can be applied to the surface of an object using different construction techniques to form a solid film with strong adhesion and a certain strength, continuity. The film formed in this way is commonly known as a coating film, also known as a paint film or coating. ”

Coatings are generally composed of four parts: film-forming substances, fillers (pigments and fillers), solvents, and additives. Depending on the performance requirements, sometimes the composition will change slightly, such as varnish without pigment filler and powder coating.

can be without solvents.

Defects are the causes.

1.Surface peeling The surface of the base layer is not cleaned, and there are dust or oil stains.

2.Partial wrinkling: The paint is too thick, the surface is dry, the inside is not dry, or the previous paint is not dry and the next one is brushed.

3.Yellowing alkali Paint is of poor quality and contains too much alkaline substance.

4.Bite the bottom and bite the color The first paint is brushed down before it is dry, or two different brands of paint are used.

5.Paint sinks The paint is too thin, too much thinner, or the brush contains too much paint and is not evenly applied.

6.Surface bumps are mixed with impurities in the paint, and should be filtered with a filter before painting.

7.The surface is not cleaned after sanding, and the dust brushed into the paint film.

8.Obvious brush marks The brush is too hard, or the force is uneven when applying.

The benefits of various paints are many, and they play a role in decorating the coated objects beautifully, practically, prolonging life, and improving performance. It has a wide range of uses, such as doors, windows, furniture, interior and exterior walls, floors, electrical appliances, handicrafts and other daily necessities.

There are also packaging industry, industry, aviation, national defense, scientific research and other fields are inseparable from paint.

Uses and characteristics of various paints.

1.Anticorrosive paint.

Main features: excellent gloss retention with ultra-long weather resistance (15 20 years), acid resistance, resistance to salt spray, ultra-long pollution resistance, high strength and high gloss, and strong adhesion, dense coating film, good freeze-thaw resistance, and good decoration.

Uses: It is widely used in anti-corrosion and anti-leakage of pipelines, equipment storage tanks, reaction axes, underwater steel structures and cement structures in petroleum and chemical plants, protection of underground pipelines and lower water tanks of gas storage cabinets, anti-corrosion of various machinery in coastal and salt farms in high-temperature areas, anti-corrosion and decoration of highway buildings.

2.High temperature paint.

Characteristics: high temperature resistance, good heat resistance and mechanical and physical properties.

Uses: Suitable for steel surfaces that are adapted to work below temperature. and heat-resistant, anti-corrosion protective coating of parts.

3.Floor paint.

Characteristics: It has strong permeability and excellent adhesion to cement, high hardness and good interlayer adhesion.

Uses: Mainly used as a supporting primer for epoxy coal asphalt paint for cement substrate.

4.Inner wall paint.

Characteristics: The paint film is hard and durable, with good adhesion, excellent water resistance, salt spray resistance and rust resistance. It can withstand the temperature test of +200 degrees to -150 degrees, and the adhesion of heat resistance to +200 degrees Celsius can still reach the level of 2 in a short time test, and it also has the characteristics of slowing down fouling, which is suitable for the anti-corrosion of the inner wall of the radiator.

Application: It is suitable for the anti-corrosion treatment of the inner wall of the radiator.

5.Route paint.

Characteristics: fast drying of the paint film, good adhesion, UV resistance.

It has good performance, good outdoor durability, and can be applied in low temperature conditions.

Uses: Mainly used for asphalt and concrete pavement as road mark coatings.

6.Mechanical paint.

Characteristics: The coating is smooth and has excellent mechanical properties.

and higher grade resistance, dust cliquity, color retention and gloss retention.

Uses: Suitable for substrates and steel surfaces. It is used for external coating of construction machinery, agricultural machinery, light industrial products and some plastic products.

7.Insulating varnish.

Characteristics: It has the characteristics of low temperature drying. It has high heat resistance, dielectric properties, and heat resistance.

Uses: It can be used for silicone rubber cable to lead out with glass wire sleeve and impregnated motor. Electrical coils.

8.Fluorocarbon paint.

Characteristics: It has ultra-long weather resistance, and can be used outdoors for up to 20 years. Good stain and washout resistance. Outstanding salt spray resistance, excellent chemical resistance.

Uses: Widely used in aviation, aerospace, bridges, vehicles, ship anti-corrosion and chemical construction and other fields.

1 All 1Orange peel and grapefruit peel: mainly due to the fact that when the atomized fine paint particles reach the paint surface, they cannot flow with each other and are poorly combined.

2.Shrinkage porosity and fisheye: the phenomenon of shrinkage and exposure of the coated surface, or the presence of fine trachoma due to the lack of treatment of the primer and the unevenness of the topcoat is called shrinkage porosity.