General knowledge of coating: treatment standard of base surface in the construction of metal fluorocarbon paint

Core tip: for the construction of metal fluorocarbon paint, qualified wall base is the foundation of construction, and also the first layer of guarantee for the project The qualified substrate shall meet five basic characteristics: firm, flat, dry, neutral and clean The construction of metal fluorocarbon paint should first check the condition of the base layer 1 Strength (the strength of the base course will directly affect the adhesion of the coating and the hardness of the coating): it can be checked by visual inspection, beating, carving and other methods The qualified base course shall be free from powder dropping, sand rising, hollowing, layer rising, cracking, peeling and other phenomena Cement mortar base plastering surface Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint Home News: for the construction of metal fluorocarbon paint, the qualified wall base is the foundation of construction, and also the first layer of guarantee for the project The qualified substrate shall meet five basic characteristics: firm, flat, dry, neutral and clean The construction of metal fluorocarbon paint should first check the condition of the base layer 1 Strength (the strength of the base course will directly affect the adhesion of the coating and the hardness of the coating): it can be checked by visual inspection, beating, carving and other methods The qualified base course shall be free from powder dropping, sand rising, hollowing, layer rising, cracking, peeling and other phenomena The plastering surface of cement mortar base course shall be troweled and compacted, with uniform color, no brush lines, plastering marks and smooth joints 2 Flatness (the flatness of the base course will affect the final decoration effect and project cost of the coating) There are four items for flatness inspection: surface flatness, internal and external corners vertical, elevation vertical and internal and external corners square, with deviation less than 2mm The base course shall be flat without hollowing, and the holes shall be filled with cement mortar, and the higher parts shall be ground with portable sand mill The concave can also be filled with special putty for spot leveling For the hollowing part, the hollowing and 10 cm around shall be removed completely, and the putty shall be repaired with cement mortar, and the next process can be started after drying For cracks larger than 2 mm, chisel them into a "V" shape perpendicular to the wall, and then repair with putty 3 Dryness: insufficient drying makes the coating soft, efflorescence, blistering, peeling, etc The moisture content of the base course shall be less than 7% Generally, the newly poured concrete wall shall be dry (1-2 months) under the condition of good ventilation The moisture content of the base layer can be accurately measured by the surface moisture meter of the mortar; it can also be preliminarily determined by the transparent film covering method The method is: cutting the film into 30cm × 30cm blocks, covering the surface of the base layer in the evening, sealing the four sides with tape, and observing whether there is obvious condensation in the film in the afternoon of the next day to determine whether the moisture content is too high If there is obvious condensation, the construction cannot be carried out 4 The alkalinity (too high base alkalinity will affect the adhesive strength of the coating, and cause quality accidents such as discoloration, blooming and peeling off of the coating) the cement mortar and lime have strong alkalinity, and the alkalinity will decrease with the evaporation of water Generally, the coating can be applied only when the base pH is less than 9 If the pH is more than 9, the base surface shall be cleaned with dilute acid solution, and then washed with clean water for drying Test method of pH value: first wet the absorbent cotton with clear water, then lightly press it on the base surface to be tested, and then measure the pH value of the wet cotton in contact with the base with pH value test paper one minute later, or directly measure the pH value after the base surface is wetted with water 5 Cleanliness: the surface of the base course shall be free of dust, laitance, oil, demoulding wax, dirt and other attachments, so as not to affect the adhesion of fluorocarbon paint 6 Others: various components, embedded parts, water heating facilities, etc on the wall shall be positioned as soon as possible according to the requirements, and the exposed steel parts shall be derusted and antirust 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,