Paint knowledge | polymer cement-based waterproof coating and construction technology

Core tip: the waterproof principle of polymer cement-based waterproof coating is that it can penetrate into the pores of concrete, form the composition similar to calcium silicate, and seal the pores of concrete to achieve the waterproof effect There is no clear requirement for the strength of concrete, but there is a requirement for the humidity of concrete In terms of technology, it is required to demould for 7 days, that is to say, it is required to make the pores of concrete JS cement-based materials can penetrate into the concrete to achieve the waterproof effect Here, I'd like to introduce the relevant knowledge of polymer cement-based waterproof coating and the construction process of polymer cement-based waterproof coating, hoping to depolymerize you Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Home of coatings: the waterproof principle of polymer cement-based waterproof coating is that it can penetrate into concrete In the pores of the concrete, there is a composition similar to calcium silicate, which can seal the pores of the concrete to achieve the waterproof effect There is no clear requirement for the strength of the concrete, but there is a requirement for the humidity of the concrete In the process, it is required that the demoulding can be done after 7 days, that is, the water in the pores of the concrete should be evaporated to dry, JS cement-based materials can penetrate into the concrete, so as to achieve the goal of To waterproof effect Here, I'd like to introduce the relevant knowledge of polymer cement-based waterproof coating and the construction process of polymer cement-based waterproof coating, hoping to help you understand the polymer cement-based waterproof coating Polymer cement based waterproofing coating is a two-component waterproof coating made of synthetic polymer emulsion (such as polyacrylate, polyvinyl acetate, styrene butadiene rubber latex) and various additives It is composed of special cement and graded sand It is a two component waterproof coating, which is composed of synthetic polymer materials with high elasticity and inorganic materials Good waterproof material Main components of polymer cement-based waterproof coating: 1 Cement 2 Polymer latex (rubber powder) 3 Sand (quartz sand mesh) 4 Filler (e.g calcium bicarbonate) 5 Auxiliaries (defoamers, anti precipitation agents, etc.) Features of polymer cement-based waterproof coating: air permeability and water impermeability: air permeability on the surface, which can prevent the formation of water vapor pressure, but also water impermeability, with good waterproof performance; strong weather resistance: wide application range, which can be used in the exposed environment, such as the sky; polymer modification: to strengthen the adhesion to each substrate; Good flexibility: it can be subject to slight vibration and displacement no more than 2-3mm wide (flexible and waterproof); simple construction: Based on cement products, tiles, plasters or paints can be directly laid on the waterproof layer; environmental protection: innocuous and harmless, can be directly applied to the drinking water pool; danger: non combustible materials, non corrosive; The wet area can be constructed: because the paint must penetrate into the bottom material through the action of water, the wet area can be constructed, such as the concrete is dry, and must be wetted with water before construction Construction process of polymer cement-based waterproof coating: 1 Base conditions: 1 Remove the sundries, oil dirt, sand on the base surface, stones and mortar pimples protruding from the surface, etc., and the cleaning work must be carried out at any time during the construction 2 In order to ensure that the film is firmly bonded to the surface of the base course, the leveling layer shall have sufficient strength, and the surface shall be smooth without sand or peeling 3 There is no requirement for the moisture content of the base course If there is open water on the base surface, the construction can be carried out by sweeping 4 The internal and external corners shall be plastered with cement mortar to form an arc angle 2、 Process flow: base treatment → primer application → preparation of polymer cement-based waterproof coating → strengthening treatment of node parts → coating and scraping of polymer cement-based waterproof coating on large surface layer by layer → end of waterproof layer → organization and acceptance 3、 Construction steps: 1 Base surface treatment: use shovels, brooms and other tools to remove construction waste If there is any stain, use solvent to clean it If there is any defect or sand running on the base, it needs to be newly repaired The internal and external corners should be made into an arc shape during leveling 2 Primer application: when the flatness of the base course is poor, mix a proper amount of water in the modifier (the general proportion is modifier: water = 1:4) and mix evenly, then apply it on the surface of the base course for primer 3 Preparation of polymer cement-based waterproof coating: first, prepare the waterproof coating (according to the weight ratio of modifier: Cement = 1:0.8), mix it with a mixer until it is even and fine, and the mixture without particles can be used The quantity of ingredients depends on the labor force arranged by the project surface and completion time, and the prepared materials shall be used up within 40 minutes 4 Strengthening treatment of joint parts: according to the design or specification requirements, the joint parts (internal and external corners, construction joints, floor drains, etc.) shall be coated with polymer cement-based waterproof coating reinforcement layer, and the matrix material shall be added in the middle of the coating for reinforcement 5 Apply and scrape polymer cement-based waterproof coating on large surface layer by layer: apply and scrape polymer cement-based waterproof coating in vertical and horizontal directions, and the latter coating shall be constructed when the surface of the previous coating is dry but not dry (generally, the time between the two layers is about 2-4 hours), whichever is not sticky 6 End of waterproof layer: the end of polymer cement-based waterproof coating shall be painted several times or sealed with sealing materials 7 Organize acceptance 4、 Precautions: 1 Each layer of coating shall be tested first to determine the amount of coating per m2, and materials shall be taken according to the measured amount during construction 2 The coating material shall be even It is required to brush and roll evenly for many times before and after, without local deposition The facade and slope shall be brushed from top to bottom to prevent falling or excessive thickness 3 the collocation of gel or conjunctiva shall not be used or mixed with new materials 4 Finished product protection: after the waterproof film is fully solidified and accepted, the film-forming protection shall be done in time to prevent the damage of subsequent process to the film, thus affecting the waterproof performance of the overall waterproof layer The education of relevant construction personnel shall be strengthened to consciously form the awareness of finished product protection, and corresponding measures shall be taken to ensure the waterproof performance of the waterproof layer 5、 Main control items of quality inspection standards and methods 1 Polymer waterproof mortar modifier must meet the design requirements and specifications Inspection method: check the factory certificate, quality inspection report, measurement measures and on-site sampling re inspection report 2 No leakage is allowed in the coating waterproof layer Inspection method: observation and inspection or water pouring and storage inspection 3 The coating waterproof layer and its details must meet the design requirements and specifications Inspection method: observe and inspect the acceptance records of concealed works General item 1 Film quality The waterproof layer of the coating shall be firmly bonded with the base course, the surface shall be flat and evenly brushed, and there shall be no defects such as flowing, folding, bubbling, exposed carcass and edge warping Inspection method: observation and inspection 2 The average thickness of the coating waterproof layer shall meet the design requirements, and the minimum thickness shall not be less than 80% of the design thickness Inspection method: needle measurement or sampling measurement Application scope of polymer cement-based waterproof coating: it can be used in wet or dry masonry, mortar, concrete, metal, wood, hard plastic, glass, gypsum board The construction of foam board, rubber, and other base planes can be used for new and old buildings and structures (such as houses, underground works, tunnels, bridges, pools, reservoirs, etc.), and can also be used as binding agents It is especially suitable for the construction of basement, underground tunnel, bathroom, water pool, etc., especially under the conditions of damp and long-term immersion in water 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 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