Find a specific scheme for the construction process of acrylic polyurethane topcoat

Baoshan Paint Guidance:

Acrylic polyurethane topcoat is a two-component acrylic polyurethane coating, good decoration, compared with BF-4002 acrylic aliphatic polyurethane topcoat, the weather resistance is slightly worse, but better than ordinary polyurethane, rubber, vinyl coatings. The primer is type A, the topcoat is type B, the varnish is type C, and the aluminum powder paint is type D. Acrylic polyurethane topcoats are suitable for the coating of steel structures and the maintenance of existing substrates, and are suitable for a variety of environments, including offshore installations, chemical and petrochemical plants, bridges, pulp and paper mills, power plants, and more.

Acrylic polyurethane topcoat construction method:

1. Open the barrel and stir: After opening the barrel, stir the paint thoroughly until there is no sediment and no color difference at the bottom of the barrel.

2. Surface treatment requirements: When coating the metal surface, it is required that sandblasting, shot blasting and rust removal reach the national standard SA212 level, keep the surface dry, free of oil, dust and other foreign substances, and paint within 4 hours.

3. Mixing ratio: weight ratio 4 (base material): 1 (curing agent).

4. Coating method: airless spraying, air spraying, and brushing can be used.

5. Theoretical coating rate: under the condition of dry film thickness 60 80 microns, kilogram square meters. Dosage of diluent: According to the construction situation, special diluent can be added appropriately, and the dosage is 5 15%.

6. After the last topcoat is finished, it must be cured naturally for 7 days before it can be put into use. If the ambient temperature is lower than 10, it should be extended appropriately.

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The construction method of acrylic polyurethane topcoat spraying is as follows:1. Substrate treatmentThe surface to be coated should be clean and dry without oil, dust and loose substances, and the topcoat should be applied immediately after sanding and sanding, and the topcoat can also be applied after the surface of the primer is dry.

2. Paint mixingAfter opening the barrel, stir the paint until there is no sediment at the bottom of the barrel, and mix the acrylic polyurethane topcoat and curing agent in strict accordance with the ratio of 5:1, the curing agent can not be added more or less, add special diluent, stir evenly with a power stirrer, and let stand for 20 minutes. The mixed paint should be used up within 4-6 hours, if it takes too long to gel, it cannot be used.

3. Construction coatingPre-coat primer and intermediate coat and reapply the product after 24 hours drying. Using the spraying process, spraying 1-2 lines, to reach the specified film thickness, the recommended thickness of 60 m, the paint film should be smooth and flat after construction, the color is consistent, no sagging, blistering, orange peel and other paint diseases.

When we choose paint, we will choose environmentally friendly, because people still pay more attention to environmental protection, and the ground paint will generally choose to use a large venue, such as a parking lot or a large stadium, thenAcrylic polyurethane topcoatWhat are the construction methods? What are the key points of acrylic polyurethane topcoat construction? Let's talk about it and introduce it to you.

1. Construction method of acrylic polyurethane topcoat.

1.Open the barrel and stir: After opening the barrel, stir the paint until there is no deposit at the bottom of the barrel, and press the paint:

Curing agent = 4:1 (weight ratio) ratio mixed and stirred, after 15 20 minutes of curing can be constructed, if the coating is indeed too thick, you can add a special thinner, the dosage is 5 15%, it is strictly forbidden to dilute with water, alcohol, banana water and gasoline, etc., and immediately after the use of the paint tightly sealed, in order to prevent moisture deterioration.

2.Surface treatment requirements: steel structure, substrate treatment requirements to reach the national standard or above, or manual rust removal to reach ST3 or above; Chemical rust removal can also be used, which is required to be oil-free, rust-free, debris-free, dry and clean.

3.The best temperature for construction is 5 30 and the relative humidity is 80%. If the temperature is too low, the curing time will be prolonged, and if the temperature is too high, the solvent will volatilize too quickly and cause the leveling to deteriorate; If the relative humidity is greater than 80%, it will cause the coating to be white, bubbles and other drawbacks.

4.Theoretical consumption: If the influence of the coating environment, coating method, coating technology, surface condition and structure, shape, and surface area size of the chain air finger during the actual construction is not considered, the general consumption is.

Second, the main points of topcoat construction.

1. The amount of paint should be determined according to the length of the active period of the coating, so that how much to use during the active period, how much to match, not too much at a time, and strictly according to the ratio in the product description to deploy. When preparing or finishing polyurethane paints, they should not be in contact with water, acids, alkalis, and alcohols. In particular, the hardener should be sealed tightly after storage and opening to prevent moisture from entering.

2. Before finishing, the surface of the substrate should be treated flat and clean, remove all kinds of dirt, and the moisture content of the substrate should be appropriate (depending on the balanced moisture content of the area where the product is used, generally about 2% lower than it), when the topcoat is polyester paint, the primer should not be shellac paint, nitro, polyurethane and polyvinyl butyral solution can be used. When polyurethane is used as primer, polyester paint must be covered within 5 hours, otherwise the adhesion of the paint film will be affected.

3. Try to avoid coating polyurethane paint in rainy days or high temperature and high humidity in summer, and low temperature and high humidity in winter, otherwise, the coating film is easy to "white". If it is necessary to paint in the above-mentioned environment, it can be prevented by adding an appropriate amount of PU anti-whitening agent to the paint, or properly heating the coated substrate to evaporate water vapor.

In our large venues, we will always see the appearance of paint, so what are the construction methods of acrylic polyurethane topcoat and what are the key points of acrylic polyurethane topcoat construction, I think you have also understood these through the introduction.

Introduction: In many large chemical and petrochemical plants, as well as many pulp mills, paper mills and power plants, you will see a kind of topcoat used by people, that is, acrylic polyurethane topcoat, which has its own unique characteristics and product characteristics, and these are the reasons why people buy it. In fact, many people who use it do not know what the characteristics and characteristics of acrylic polyurethane topcoat are, and they don't know how to buy and use it.

In our daily life, we often see that more enterprises in the factory are using acrylic polyurethane topcoat, and because of its unique advantages, it is also well-known in the topcoat industry, so what are its characteristics and product characteristics? Here's the answer.

1. Acrylic polyurethane topcoat characteristics

In addition to the acid, alkali, water, solvent and oil resistance characteristics of the general topcoat, its adhesion, color retention, thermal stability and electrical insulation are also better. Under normal circumstances, the use of topcoat is used for decorative purposes, and its paint film is relatively full, and there will be no early stupid depression to the touch, smooth and smooth, and the decoration is very strong.

In addition, the acrylic polyurethane topcoat is widely used, so it can also be used according to different customers' requirements for the topcoat, to produce different gloss effects, and these effects look very natural, like the general home matte, matte, high-gloss, or glossy, it can be done.

Second, the product characteristics of acrylic polyurethane topcoat

When it comes to the characteristics of acrylic polyurethane topcoat, the first thing to mention is that it has good weather resistance. Since it is used on the surface of a material such as a steel structure, it definitely has a strong advantage in terms of weather resistance. Generally, this kind of topcoat will be used in chemical industry, offshore facilities, petrochemical plants and other places, so the paint film should be hard and the adhesion should be better, and it almost has these advantages.

In terms of decorativeness, the color of the acrylic polyurethane topcoat is relatively bright and full. And as mentioned above, it has good wear resistance, acid resistance, water resistance, oil resistance, heat resistance and other excellent properties, in terms of gloss and color retention, it is also very dominant. Because the paint film is relatively hard, it also has excellent impact resistance.

The above is for you to introduce the relevant knowledge of acrylic polyurethane topcoat, no matter in which aspect, this kind of topcoat is relatively cost-effective, users can buy according to their own needs, I hope the article can help you.

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