"Coating Society Science" waterproof coatings and other common problems analysis, super detailed!

With the diversification of modern building functions, waterproof coatings in the building more and more applications, but because the paint belongs to the semi-finished waterproof materials, after strict quality control of the material in the hands of customers, inevitably because of transportation, construction and other reasons will cause some problems, today's customer applications in the common problems of the cause, solutions and precautions for the analysis of the use of late customers to avoid risks.
1 single-component polyurethane waterproof coating summer storage reason analysis wet curing single-component material in the loading and unloading and transportation process, bumps and collisions lead to seal sealing is not strict.
summer if open storage, high temperature, rain, water vapor and materials will slowly polymerization reaction, resulting in increased viscosity of the paint or even clinging, seriously affecting the use of the effect.
resolution measures in accordance with GB/T 19250-2013 polyurethane waterproof coating standards in the "storage and transportation" requirements, materials in the storage and transportation process should avoid sun and rain, storage temperature of 5 degrees C to 40 degrees C.
recommends that it be stored indoors.
note single-component polyurethane is recommended for inverted placement, which can be "liquid sealed" by coating to avoid polymerization with moisture in the air.
2 two-part, single-group polyurethane coating after the construction of long drying time analysis (1) double-group polyurethane is not strictly in accordance with the use of the instruction manual ratio, resulting in local-NCO deficiency or lack of curing chain agent, curing no strength or even can not cure; Polyurethane construction with the addition of lively H-plus diluent, consumption of paint free-NCO active group, two-component armor can not react with the curing ingredients in the B material into a film;
(3) thinner is added too much, the diluent evaporates slowly, resulting in the inability to form a film.
(4) polyurethane coating belongs to the reactive coating, which is constructed under low temperature conditions in winter, resulting in a relatively long dry time.
solution (1) in strict accordance with the construction requirements ratio weighing, mixing evenly used, not recommended manual stirring, it is recommended to use electric mixer stirring for more than 2 minutes.
(2) need to add diluent, add the company designated model, and first a small area to add a brush, can normally form a film, and then use in bulk.
(3) thinner addition is recommended to be less than 5% of the weight of B.
(4) according to GB 50108-2008 underground engineering waterproofing technical specifications and JGJ 298-2013 residential indoor waterproof engineering specifications, both require construction temperature of 5 to 35 degrees C.
the long drying time of polyurethane coating due to low winter temperatures, after coating drying and curing does not affect product performance.
3 polymer cement waterproof coating construction cracks and yin and yang angle, wall root easy to crack cause analysis (1) construction environment temperature is too low, 0 degrees C below, paint moisture volatility slow, alternately frozen melt cycle, resulting in non-film, cracks;
(2) when the grass-roots water, there is clear water place and grass-roots adhesion difference brush too thin, and the grass-roots can not penetrate bond.
(3) Yin and Yang angle and wall root due to the thickness of paint accumulation is too thick, surface moisture volatile conjunctivation, the inside layer can not be dried through, the material inside and outside contraction is inconsistent and the inside water vapor volatile impact, the surface produces small cracks.
(4) construction, random addition of water, resulting in ratio imbalance, viscosity is too small, flowing to the root of the wall, can not be fully cured.
(1) in accordance with the JGJ 298-2013 waterproof indoor construction ambient temperature requirements of 5 degrees C to 35 degrees C, does not meet this ambient temperature is prohibited construction.
(2) in strict accordance with the instruction manual ratio requirements, can not change the ratio or water dilution at will.
(3) All detail nodes should be rounded treatment, large areas before painting, should be in the tube root, wall root, yin and yang corner to do additional layer, and paved tire body enhancement materials.
the paint thin coating many times brush, the direction of the secondary brush vertical, to avoid accumulation.
4 cement base osmosis crystalline waterproof coating sand, shell cause analysis (1) grass-roots unprocessed, there are floating ash, sand, oil pollution and other conditions, directly painted resulting in coating and grass-roots shedding shell.
(2) before the construction of the grass-roots wetting treatment, the grass is dry and water-scarce state, direct brushing caused the coating and grass-roots shedding shell.
(3) did not according to the required proportion of the configuration of slurry, water added too much, resulting in shelling with the grass roots.
(4) did not carry out maintenance in accordance with conservation requirements, resulting in paint sanding.
Solution measures (1) the grass-roots should be treated as no floating ash, sand, no oil pollution, if necessary, with steel brush high-pressure water flushing the grass-roots; In accordance with the proportion of product requirements to configure the slurry, not to add too much water, and the use of electric mixer fully stirred evenly;
5 emulsified type spray coating construction after the reason analysis of the reasons for sunburn foaming bag (1) brush class, one-time brush is too thick, resulting in the water inside can not be volatile, but the surface into a film, the formation of the drum bag.
(2) spray class, A and B are not fully exposed when spraying, or the amount of B is insufficient.
(3) before the construction is not fully cured, washed away by rain, resulting in film damage, paint absorbent water, after exposure to the sun foaming.
solution (1) brush class, thin coating many times brush, the first solid work before painting two.
(2) spray coating, adjust A, B parts of two nozzles, so that it can cross into a fan shape, full contact with broken milk.
adjust the flow and spray in proportion.
note that outdoor use of emulsified coatings, should avoid rainy weather, paint generally at room temperature 24h basic can be done, complete do-it-it needs 72h.
6 Poor bonding effect with substate after non-curing construction, poor cause analysis of coating creep (1) no removal of substate before construction, surface debris, oil, sand, stone, etc. more, resulting in paint and substate contact surface small, poor bonding; Cement strength is not up to standard, easy peeling, sanding, resulting in the coating and substate bonding strength is poor, (3) the thickness of the coating did not meet the construction standards of 2mm thick, the coating is too thin, resulting in poor creep, (4) the pre-construction coating heating temperature is too high, heating time is too long, the material aging is serious, loss of creep.
measures (1) must be carried out before the construction of the base surface removal, to ensure that the grass-roots no debris, oil, sand, stone and so on.
to clean up the foundation side of the construction, to ensure that there will be no new debris at the grass-roots level.
(2) grass-roots concrete or cement must be maintained with sufficient strength before construction can take place.
(3) regardless of scraping or spraying, after construction needs to randomly take local points, needle and needle method acceptance construction thickness, after meeting the standards can be laid roll.
not cure before the construction of equipment to preheat, to ensure that the paint minimum heating time to complete the construction, while the heating equipment is not too high, to prevent material aging.
7 on non-curing coatings understanding the error of non-curing coating advantages non-curing coatings, that is, to make long-term placement will not cure, to maintain the original properties of waterproof materials, can improve the life of the waterproof layer.
non-curing coatings are introduced from Korea to the Chinese market, it has a unique ultra-strong creep performance, and a variety of materials can form a composite waterproof and sell well.
non-curing characteristics of high creep, zero cohesion, super-extension, high bonding, self-healing, can repair the soil structure cracks caused by leakage.
The distinction between "high bonding" and "high bonding force" is not possible for many customers to distinguish between "high bonding" and "high bonding force", and believe that non-curing must be pulled like self-adhesive coils, or that stretching requires a lot of effort to qualify for the product.
In fact, if the material itself is very cohesion force is very large, it will lead to its mobility, creep, poor bondability, can not repair the cracks in the soil structure, it will not be self-healing function.
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