Coating standard: underground polyurethane waterproof coating cold operation construction standard

Core tips: 1 Scope This process standard is applicable to the application of polyurethane waterproof coating in cold working film waterproof engineering for underground waterproof engineering of industrial and civil buildings and structures 2 Construction preparation 2.1 materials and requirements 2.1.1 polyurethane waterproof coating shall have factory certificate and manufacturer's product certification documents, and retest the following technical performance Polyurethane waterproof coating shall be delivered in drums of component A and component B; the content of component A: isocyanate group shall be 3.5 ± 0.2% Component B: hydroxyl content 0.7 & plusm 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 Coating home news: 1 Scope this process standard is applicable to the underground waterproof engineering of industrial and civil buildings and structures using polyurethane waterproof coating for cold operation 2 2.1 construction preparation 2.1 materials and requirements 2.1.1 polyurethane waterproof coating shall be provided with factory certificate and manufacturer's product certification document, and the following technical performance shall be retested Polyurethane waterproof coating shall be delivered in drums of component A and component B; the content of component A: isocyanate group shall be 3.5 ± 0.2% Component B: the content of hydroxyl is 0.7 ± 0.1% The two-component materials shall be kept separately and stored indoors in a ventilated and dry place The storage period is 6 months for component A and 12 months for component B when in use, component A and component B shall be mixed according to the proportion of 1:1 to form polyurethane waterproof coating The technical performance indexes are as follows: solid content: ≥ 93% tensile strength: ≥ 0.6MPa, elongation: ≥ 300% low temperature flexibility: no crack around the round rod of φ 20mm at - 20 ℃ Heat resistance: 80 ℃ impermeability: 0.2MPa drying time: 1-6h 2.1.2 auxiliary material: 2.1.2.1 phosphoric acid: used as retarder 2.1.2.2 dibutyltin dilaurate: used as accelerator 2.1.2.3 xylene or ethyl acetate: used for dilution and cleaning tools 2.1.2.4 cement and 325 ordinary portland cement are used to prepare cement mortar to plaster the protective layer 2.1.2.5 medium sand: round medium sand with particle size of 2-3mm and mud content of no more than 3%; it is used to prepare cement mortar for plastering protective layer 2.2 main machines and tools: 2.2.1 electric machines and tools: electric mixer 2.2.2 hand tools: mixing bucket, small iron bucket, small flat shovel, plastic or rubber scraper, rolling brush, brush, spring scale, fire equipment, etc 2.3 operation conditions: 2.3.1 for the cold operation of polyurethane waterproof coating for the underground waterproof layer, before the waterproof layer is painted under the condition of high underground water level, the underground water level shall be lowered and the drainage treatment shall be done to make the underground water level drop to 300 mm below the operation elevation of the waterproof layer and keep it until the construction of the waterproof layer is completed 2.3.2 the base course applied with waterproof layer shall be plastered with leveling layer according to the design It is required to be troweled, calendered, solid and flat, without sanding, with water content less than 9% The internal and external corners shall be plastered into an arc angle 2.3.3 before the application of waterproof layer, the dust, sundries, residual mortar blocks and protruding parts shall be treated and cleaned 2.3.4 the polyurethane coating shall not be constructed under the conditions of rain, and the construction ambient temperature shall not be lower than 5 ℃, and no fireworks are allowed during operation 3 Operation process 3.1 process flow: base cleaning → primer application → construction of waterproof coating layer → protective layer 3.2 base treatment: before the construction of waterproof coating, first clean the sundries and mortar blocks on the base surface, and wipe them with a clean wet cloth After checking that the base is free of defects such as uneven, air crack and sanding, the next process can be carried out 3.3 primer (equivalent to cold primer oil): 3.3.1 preparation of primer (base treatment agent): mix polyurethane a, B and xylene in the proportion of 1:1.5:2 (weight ratio) and mix evenly, and use up the prepared material within 2H 3.3.2 primer brushing: the prepared primer shall be evenly brushed on the surface of the base course with a long roller brush, the brushing amount is about 0.3KG / ㎡, and the next process can be carried out when the handle is not sticky about 4h after brushing 3.4 construction of membrane waterproof layer: 3.4.1 material preparation: Polyurethane shall be mixed in the proportion of 1:1.5:0.3 (weight ratio) according to a material, B material and xylene, and be forced to mix with an electric mixer for 3-5min, until it is fully mixed and evenly used The prepared mixture shall be used up within 2h, and the time shall not be too long 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,