For those who decorate new homes, the waterproofing of kitchens and bathrooms is a problem that people attach great importance to. Neighboring disputes between neighbors because the kitchen and toilet are not properly done, resulting in water leakage and neighborhood disputes occur from time to time, for these reasons, people are also cautious about the choice of waterproof coating. However, in the current installation, the waterproof coating is the most commonly used polyurethane waterproof coating , and the polyurethane waterproof coating is a one-component environmentally friendly coating for liquid construction. The polyurethane prepolymer is used as the basic component, and there is no additive such as tar and bitumen. It is therefore extremely environmentally friendly and is welcomed by the modern home improvement market. Today Xiaobian wants to share with you is the polyurethane waterproof coating construction process, let's take a look.
First, the material requirements
1, polyurethane coating waterproof material (two-component), should be factory certificate, should be retested after use.
2. Group A is a polyurethane prepolymer containing isocyanate groups prepared by polymerization and reaction of polyether resin and diisocyanate. The appearance is light yellow, sticky, barreled, 20kg per barrel. . Part B is made of curing agents, accelerators, toughening agents, mildewproofing agents, fillers, and thinners. It has red, black, white, yellow and brown colors, pastes, and barrels. 40kg per barrel.
Second, the main equipment
Should generally be equipped with electric mixer (power 0.3-0.5KW, 200-500r/min), stirring barrel (volume 10L), paint bucket (3L), plastic or rubber scraper, rolling brush, paint brush, spring scale, dry powder fire extinguisher Wait.
Third, the operating conditions
1, brushing the surface of the waterproof layer of the grass-roots level, you must clean the dust, debris, etc., the surface of the residual mortar blocks and protruding parts should be shoveling, sweeping, plastering, pressure is not, the yin and yang angle should be rounded or Obtuse angle.
2. The base surface of the waterproofing layer should be kept dry, and it should be smooth and firm.
3, in the leveling layer ground leakage, pipe roots, outlets, sanitary ware roots (edges), to close the sleek. The slope meets the design requirements and the components must be firmly attached and tightly sealed. After acceptance.
4, highlight the roots of the ground, floor drain, drain, yin and yang, and other details, should do an additional layer of supplementary treatment, after brushing the polyurethane primer, after inspection and complete the hidden project acceptance.
5, all kinds of materials used in the waterproof layer, the base layer treatment agent, xylene, etc. are all flammable materials, storage and storage should be far away from the fire, the construction operation, should be strictly prohibited fireworks.
6. The construction of waterproof layer shall not be carried out in rainy or windy days, and the ambient temperature during winter construction shall not be lower than 5°C.
Fourth, the operating process
1, process flow
Clean the surface of the base layer → Detail treatment → Prepare the primer → Brush the primer (equivalent to the cold base oil) → Detail the middle layer construction → The first pass of the coating → The second pass of the coating → The third pass of the coating waterproof layer → Waterproof Layer test once →Protective layer facing layer construction →Waterproof layer secondary test water →Waterproof layer acceptance
2, before the construction of the waterproof layer, the surface of the base should be cleaned of dust and other debris, and wipe with a clean damp cloth once.
3, brushing the surface layer of the waterproof layer of the base, shall not be uneven, loose, empty drums, sand, cracking and other defects, the water content is generally not more than 9%.
4, brush primer (equivalent to cold oil):
1) Prepare the primer, first add the polyurethane material and the material to the xylene, and the ratio is 1:1.5:2 (by weight), mix well, and the amount of preparation should be determined according to the specific conditions, and should not be too much.
2) Apply the primer, press the primer mixture prepared by the above method, and evenly brush on the surface of the base layer with a long roller brush. The brushing amount is 0.15-0.2kg/m2. After the coating is applied for 4 hours at room temperature, feel. When not sticky, you can do the next process.
5, coating waterproof layer construction: polyurethane waterproof material for the polyurethane material, polyurethane material and xylene, the ratio of 1:1.5:0.2 (weight ratio).
1) In the construction of film waterproof material, the mixing ratio must be accurately measured, and must be stirred with an electric mixer.
2) Construction of additional layers: floor drains, pipe roots, outlets, roots (edges) of sanitary ware, yin and yang corners, etc., should be coated with an additional layer of waterproof cloth before painting a large area. The pressure of each side of the junction seam 200mm. Brushing the water-imitation material, the specific requirement is that, after drying at room temperature for 4h, the second coat of waterproof material should be applied. After 24 hours of drying, a large-area coating waterproof layer can be applied.
3) Coating Waterproof Layer: The first coating waterproof layer: The waterproof material that has been prepared with polyurethane coating film, with a plastic or squeegee evenly smeared on the base surface of the primer has been painted, the amount per square meter is 0.8kg, there must be no defects such as leaking brush and bubbling. After 24h curing, the second coating can be performed.
Second coating: On the cured coating, the coating is evenly applied to the surface of the coating in the direction perpendicular to the first coating. The amount of scraping is the same as that of the first pass. There must be no leakage brushing and bubbling. defect. After curing for 24 hours, the third coating film shall be smeared according to the above formula and method, and the amount of scraping is preferably 0.4-0.5 kg/m2. The three coats have a thickness of 1.5mm. The first test of the water, in case of leakage, should be repaired until no leakage.
In addition to the above-described painting method, it is also possible to use a long brush roller to layer the brushes in four directions in a direction perpendicular to each other. Spraying can also be used if conditions permit, but thickness and uniformity must be mastered. The parts that are not easy to be sprayed on details should be filled with brush after being dried.
4) Prior to the construction of the waterproof layer of the coating film, relevant personnel should be organized to make a serious presentation of the technology and the use of materials. After the completion of the construction of the waterproof layer, after a storage test of more than 24 hours, no leakage of seepage water was found to be qualified, and then the inspection and inspection of the concealed works was carried out and the construction of the next track was completed.
6, in the construction process encountered problems should be done as follows:
1) When it is found that the coating viscosity is too large to be easily painted, a small amount of xylene may be added to dilute it. The amount of the added material should not exceed 10% of the material.
2) When it is found that the paint cures too fast and affects the construction, a small amount of retarder such as phosphoric acid or benzenesulfonyl chloride may be added, and the amount of the retarder added should not be greater than 0.5% of the material.
3) When the coating is found to be too slow to affect the construction, a small amount of dibutyltin dilaurate may be added as a coagulant, and the amount of addition should not be greater than 0.3% of the material.
4) The coating waterproof layer is still sticky after being cured for 24 hours. If it is difficult to apply the second coating, a layer of talcum powder may be applied. When the person performs the operation, the feet may not adhere and the coating will not be affected. Film quality.
If it is found that the material is precipitated, it should be mixed with A material before mixing, otherwise it will affect the quality of the coating film.
V. Quality standards
1, ensure the project
1) The technical performance of the coating waterproof material and non-woven fabric must meet the design requirements and relevant standards. The product should be accompanied by the factory certificate, waterproof material quality certification, on-site sampling test, unqualified or retest unqualified waterproof Material must not be used.
2) Polyurethane coating waterproof layer and its details must comply with the design requirements and construction specifications, and must not have leakage phenomenon.
2. Basic items
1) The base layer of the polyurethane coating waterproof layer should be solid, clean and flat, with rounded or obtuse angles at the yin and sun corners.
2) Polyurethane primer, polyurethane coating additional layer, the brushing method, lap joint, head should meet the requirements, and should be firmly bonded, tight, joint sealing, no damage, empty drums and other defects.
3) The waterproof layer of polyurethane coating film should be painted evenly, and the protective layer and waterproof layer should be firmly bonded with no defects such as damage and uneven thickness.
Sixth, finished product protection
1. If the waterproof layer of polyurethane coating film has been painted, protective measures should be taken in time. Before the protection layer can be used, it is not allowed to wear spiked shoes into the room to avoid damaging the waterproof layer.
2. The surrounding waterproof layer on the ground pipe roots, floor drains, drain outlets, sanitary ware, etc. shall not be damaged, and parts shall not be displaced.
3, floor drains, drains, etc. should be kept open, construction should prevent debris from falling into the water, and should be carefully cleaned after testing the water.
4. During the construction of the waterproofing layer of polyurethane coating film, people must not walk before uncured so as not to damage the waterproof layer and cause hidden troubles of leakage.
5, polyurethane coating waterproof layer construction process, should pay attention to protect the door, wall and other parts to prevent pollution of finished products.
Seventh, should pay attention to the quality problem
1, empty drum: waterproof layer empty drum generally occurs between the leveling layer and the coating waterproof layer and joints, because the base layer of water is too large, so that empty film coating, the formation of bubbles. The moisture content should be controlled during construction and carefully handled.
2. Leakage: Leakage of water in the waterproof layer occurs in the pipe roots, floor drains, sanitary ware, and yin and yang corners that pass through the floor. The reason is that the roots, floor drains and other components are loose, the bonding is not strong, and the brushing is not strict. Or the waterproof layer is partially damaged, and the length of the lap joint of the component joint seal is not enough. Before the construction of waterproof layer of coating film, it should be carefully checked and repaired.
The above about the construction process of polyurethane waterproof coating is briefly introduced here, I hope to help you. For more information, please visit this website. Stay tuned.
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