Coating classification: pinhole phenomenon of coating film

Core tip: the pinhole phenomenon of paint film refers to a kind of pinpoint pinhole phenomenon that appears on the surface of paint film The needle tip is small, just like a pinhole, with an aperture of about 100 μ M The main reasons for pinhole phenomenon are as follows: ① The hole on the surface of wood is too deep, filling is difficult and grinding is not good; ② The interval between two spraying is too short, the lower coating is not completely dry, and the upper coating is rapidly dry; ③ The coated surface has dust and moisture, and the compressed air has water and oil; ④ There is not enough time for the paint to stand after mixing; ⑤ One time thick coating, surface Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Paint Home News: the pinhole phenomenon of paint film refers to a kind of pinpoint pinhole phenomenon that appears on the surface of paint film The needle tip is small, just like a pinhole, with an aperture of about 100 μ M The main reasons for pinhole phenomenon are as follows: ① the wood hole on the wood surface is too deep, filling is difficult, and grinding is not good; ② the interval between two spraying is too short, the lower coating is not completely dry, and the upper coating is rapidly dry; ③ the coated surface has dust, moisture, and compressed air has water and oil; ④ the paint is mixed well, and the standing time is not enough; ⑤ One time thick coating, the surface is dry and the underlying solvent continues to evaporate and bulge; ⑥ use poor paint diluent or misuse diluent; ⑦ add too much curing agent or misuse curing agent; ⑧ use too little diluent, the viscosity of the paint is too high; ⑨ the construction environment temperature is too high, the humidity is too high; ⑩ spray pressure is too large or too far Solutions: ① the wood surface shall be fully filled and sanded to meet the requirements; ② when painting for many times, the recoating time shall be extended to allow the lower layer to be fully dry; ③ the dust and water on the surface shall be treated well, and the air shall be dried for more than 2-3 hours after water grinding to purify the compressed air; ④ it can only be used after mixing evenly and standing for 5-10 minutes; ⑤ it shall be constructed twice and many times; ⑥ Use matching products; ⑦ mix the paint correctly according to the specified mixing proportion, and fully mix evenly; ⑧ increase the amount of diluent to achieve the best viscosity in construction; ⑨ try to improve the working environment, the temperature is too high in summer, so the amount of curing agent should be reduced accordingly, and slow drying solvent (such as cyclohexanone and CAC) should be properly selected; ⑩ adjust the spraying pressure and distance Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,