油漆知识65问（Knowledge of paint）.doc

油漆知识65问（Knowledge of paint） 1. Why is it best to use primer as the underlying filling in the paint process? Answer: because the primer, designed to fill for the main purpose of formula design, it has excellent filling and polished, and the cost is low, and if do the bottom filled with paint, filling effect is poor, And the cost is high. 2. In the bottom coloring process, why not use transparent putty to fill wooden eyes? Answer: before colouring, use transparent putty, can make plank is not lubricious. If transparent putty is used after colouring, because the putty is thick and uneven, it will affect the uniformity of coloring. 3. What is the difference between a closed and a primer? A: the permeability of the base is better than the primer. After the film is formed, the seal between the base and the wood fibers is more dense than the primer. Closed effect is better. 4. Why should the primer be thoroughly polished before coating? Answer: 1, enhance its adhesion. 2, the surface paint has the stronger with the trap, if the ground lacquer is uneven, the coating effect of the coating is poor. What is the standard for the thorough polishing of the primer? Answer: 1, 450 Angle to see a light spot. 2. It is made of wool glass. 6. What is the standard for the number of paint brushes? Answer: should thoroughly fill the wooden eye. The effect of the paint film is obtained by grinding. 7. Why does PU paint emphasize the supporting use of main paint, curing agent and thinner? Answer: different PU paint, have different dilution system, solid content is also different. If the use of unmatched diluent or curing agent, it will affect the crosslinking reaction of paint, produce hardness not enough, no Dry, film cracking and other defects. 8. Why do you emphasize the proportion of PU paint when blending? A: the ratio of PU paint to curing agent is calculated by chemical reaction molecular formula. The proportion should be strictly controlled. If you add the hardener, the paint film i