2K PU INDUSTRIAL WOOD PAINT FOR INTERIOR DESIGN

1. Introduction to 2K PU industrial wood paint 

Vietnam's wood paint market is diverse in types, quality, and origin. After a long period of establishment and development, domestic manufacturing enterprises have been meeting most of the market's demand. Wood paint can be 1K or 2K grade, dry natural, or UV dry paint. Wood paints are classified according to manufacturing technologies such as solvent-based paints, water-based paints, high-solids paints, and UV curing paints.

Indoor 2K PU wood paint is one of the popular wood paints for furniture. 3 typical types of paints: primer, high-gloss coating, matte coating.

- Wood primer is the first layer to be painted directly on the wood surface with the aim of filling the wood heart, increasing the adhesion between the wood surface and the coating, protecting the wood from the inside, increasing the smoothness of the wood surface before coating.

- Paint finish and matte paint is the next layer after primer to improve the aesthetics of interior products after finishing, protecting the wood surface from the environment (scratch resistant, moisture resistant). Depending on the aesthetic needs of the product, people choose a glossy or matte finish.

- Paint finishes usually have a very high gloss (above 95 GU). The market has 4 popular types: matte 30 - 50 - 75 and 100.

2. Raw materials for 2K PU wood coating

The main raw materials for 2K PU industrial wood paint include Alkyd short oil resin, TDI type Isocyanate curing, additives, and solvents.

- Alkyd short oil resin acts as a film-forming agent. Depending on whether the 2K PU wood paint is primed or coated, glossy, or matte, the manufacturer will choose the right short oil resin. Short oil resin for wood has 4 main types: soybean oil-based resin, coconut oil-based resin, synthetic resin, and resin from some other special oils (such as castor oil, tall oil ...)

- The TDI curing agent chemically reacts with the short oil resin to form an internal bond in the paint film and the external bond - between the paint film and the wood surface (for primers) and between the paint layers.

- Additives play a role in modifying and enhancing some properties of the paint film such as anti-foaming, anti-deposition, face tension, blurring ...

- Solvents help dilute and adjust the viscosity during construction.

Photo: Some chemicals producing 2K PU wood paint

3. The experimental process at Megarad Research and Experimental Center

- Finished paint samples at Megarad lab of Mega Vietnam are processed according to the following steps:

Planning-> Prepare sample materials -> Make samples -> Sample paint finished products.

>> See more video: 2K PU wood paint production technology <<

- The paint sample is filtered out of impurities, sprayed to evaluate technical criteria.

At Megarad laboratory, we experimented with 3 finished PU2K wood paint samples, including primer, varnish, and 50% matte coating.

- The primer has a viscosity of about 16-20 Pa.s, and the solid content is about 64%.

- The varnish has a viscosity of about 85-90 KU, the solid content of about 67%

- The matte coating has a viscosity of about 2.5-3 Pa.s and solid content of about 60%.

In order to assess the quality of the finished paint sample, we execute the sample construction on the wooden template. The construction process includes the following steps:

- Step 1: Prepare the wooden sample. Prepare treatment by sanding for smooth wooden specimen surfaces.

- Step 2: Prepare paint samples before spraying: Mix original paint, curing agent, and solvent in the correct ratio.

- Step 3: Fix the template on the spray rack

- Step 4: Prepare spray gun. Check bec spray.

- Step 5: Spray the first primer to spray the sample from left to right, from top to bottom until the hearts are filled.

- Step 6: After at least 1 hour, make sanding by machine (or hand) and clean the template.

                   At this step, the quality of the primer is fully assessed.

- Step 7: Continue to spray the 2nd primer, depending on the surface of each type of wood will spray with different thickness.

- Step 8: After at least 1 hour, continue sanding and cleaning the template

- Step 9: Apply glossy or matte finish depending on the intended use. Spray the sample from left to right, from top to bottom until the surface is stretched, clear, and evenly spread.

- Step 10: Store the template in a clean, dusty area and evaluate the surface, surface dry time, and dryness. Wait for the sample to dry completely after 7 days to assess other physical and mechanical properties.

4. Evaluate finished paint samples

The satisfactory specimen is the one with a flat, stretch, clear, well-spread appearance, free from foam, chrome, and dry thickness in the sample test standard.

The sample template is assessed with the following mechanical and mechanical properties: sanding time (with primer). Paint film surface, pencil hardness, gloss, adhesion.

Photo: Table of evaluation results of 2K PU wood paint

The coating surface dries quickly, with dry thickness in the range of 50 - 60 μm.

+ With lining: Minimum sanding time 1 hour, good spreading without scum, good adhesion (point 1), pencil hardness (HB).

+ With a matte coating: Smooth surface, deep, cool hands, good adhesion (point 1), gloss (about 50-55GU), pencil hardness (H)

+ With gloss coating: Surface is glossy, clear, sharp, cool hands, good grip (point 1), high gloss (above 95 GU), pencil hardness (H)

After assessing the basic criteria, indoor 2K PU wood paint samples continue to be monitored and stored for a minimum of 1 year.

5. Some notices for 2K PU industrial wood paint products

- Increasing viscosity when storing

- Deposited with powder and gel when stored

- Slow to dry during the construction

- The paint film has air bubbles, chrome, or a lumpy surface

- The paint film surface must be moldy when applied in humid and humid weather

Photo: PU 2K wood paint 

Mega Vietnam Chemical Company provides reliable and stable raw materials, and at the same time, provides consulting services on the transfer of production technology based on experiments with high reliability.

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Contact

MEGA VIETNAM

Office address: Floor 2-A2-IA20, Nam Thang Long Urban Area, Pham Van Dong Street,

Dong Ngac Ward, Bac Tu Liem District, Hanoi City, Vietnam

Tel: (+84) 24 375 89089; Fax: (+84) 24 375 89 098

Website: megavietnam.vn

Hotline: 1800.577.728 Zalo: 0971.023.523