Coating technology: petroleum asphalt polyurethane waterproof coating and its construction technology

Core tips: petroleum asphalt polyurethane waterproof coating and its construction technology -- standard leaf forest waterproof coating with high elongation The product is an amorphous viscous liquid substance before construction and solidification, which is easy to construct on the base surface with complex shape, vertical and horizontal pipes and variable cross section Petroleum asphalt polyurethane waterproof coating is a two-component chemical reaction curing waterproof material with high elasticity and high elongation Component A is a polyurethane prepolymer containing isocyanate group (NCO) which is made of polyether resin, diisocyanate and other raw materials through hydrogen transfer to form a polymerization reaction; component B is a curing agent (or "curing agent") Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Home of coatings news: petroleum asphalt polyurethane waterproof coating and its construction technology standard leaf forest, high elongation waterproof coating The product is an amorphous viscous liquid substance before construction and solidification, which is easy to construct on the base surface with complex shape, vertical and horizontal pipes and variable cross section Petroleum asphalt polyurethane waterproof coating is a kind of two-component chemical reaction curing waterproof material with high elasticity and high elongation Component A is a kind of urethane prepolymer containing isocyanate group (NCO) which is made of polyether resin, diisocyanate and other raw materials through hydrogen transfer to form polymerization reaction; component B is a kind of curing agent (or crosslinking curing agent) and catalyst (or accelerant) and the prepared petroleum asphalt and cosolvent and other materials are processed by vacuum dehydration, mixing, grinding and dispersion and other processes The two components of a and B are mixed evenly according to a certain proportion, and painted on the surface of the base course that needs to be waterproof treatment, and often cross-linked and solidified at a temperature, so as to form a low toxic, odor free, continuous, elastic, seamless and overall film waterproof layer Since its successful development, petroleum asphalt polyurethane waterproof coating has been successively built in Zhongnanhai substation, Beijing Financial Building, Beijing celebrity hotel and Zhengzhou State Administration of Taxation complex building with an area of more than 200000 square meters, or Ye Lin Biao was born in Yangchun City, Guangdong Province in November 1933 Beijing Construction Engineering Research Institute, professor level senior engineer, has been engaged in waterproof materials and waterproofing for many years In the scientific research and development of the project, many achievements have won the second and third prizes of the Ministry of construction, Beijing Municipality and the national science and technology progress, and the construction and application of the basement, toilet and bath room rebuilt on Fuxing Road 34 in Beijing, as well as the roof and pool with rigid protective layer and other waterproof projects 1 Composition and technical characteristics of petroleum asphalt polyurethane waterproof coating 1.1 for many years, the polyurethane waterproof coating of petroleum asphalt has been used in the construction of polymer coating waterproof projects in China However, due to the complex composition of coal tar, it has varying degrees of volatility and toxicity, and even contains some carcinogenic substances, which is very easy to pollute the environment and affect people's health For this reason, some provinces and cities (such as Beijing) have officially issued a document to prohibit the use of coal tar polyurethane waterproof coating in all new projects and maintenance projects The low toxicity and low pollution polyurethane waterproof coating with better durability and more stable physical and mechanical properties is just a new product developed under this situation 1.2 preparation mechanism of asphalt polyurethane waterproof coating: adding a proper amount of hydrophobic materials such as asphalt or coal tar into the polyurethane waterproof coating as fillers can not only reduce the cost of the coating, but also prevent the hydrolysis of hydrophilic groups in the polyurethane, so as to further improve the water resistance of the coating waterproof layer and extend the service life Limit Compared with coal tar, petroleum asphalt has the characteristics of low toxicity, less environmental pollution, no active group in itself, no polyurethane curing reaction, more regular molecular structure and more stable physical and chemical properties However, petroleum asphalt is a kind of macromolecular hydrocarbon and non hydrocarbon material with the largest molecular weight, the most complex composition and structure, and containing small amount of sulfur and nitrogen and composed of oxygen atoms It is mainly composed of asphaltene, gum and oil Its content varies with the origin and processing method of crude oil In general, petroleum asphalt contains 10% ~ 20% asphaltene Asphaltene is often used as the core to absorb colloid to form a stable micelle, which is surrounded by a weak polarity saturated hydrocarbon (i.e oil) to form a dispersion The polarity of petroleum asphalt is far lower than that of coal tar, so the compatibility between petroleum asphalt and polyether polyurethane prepolymer is far worse than that of coal tar, so it is difficult to mix them directly Only by adding a kind of cosolvent with different polarity at both ends of the molecular structure segment between them, the polar end is compatible with polyurethane prepolymer, and the polar end is weak Compatible with petroleum asphalt In this way, the cosolvent acts as a rope to connect the polyurethane prepolymer with the petroleum asphalt, so that the whole system can be mixed uniformly In the production process, the prepared asphalt is mixed with a certain amount of cosolvent, curing agent, accelerator, etc to prepare the B component with room temperature crosslinking curing effect The rubber like elastomer can be formed by mixing component B and component a (i.e polyurethane prepolymer) in a certain proportion and uniformly 1.3 compared with coal tar polyurethane waterproof coating, the technical characteristics and scope of application of petroleum asphalt polyurethane waterproof coating are lower in toxicity, less in irritant odor, less in environmental pollution, stable in product performance and good in durability of waterproof coating (3) it is easy to form a continuous, elastic, seamless and overall film waterproof layer in the construction process, so as to improve the waterproof and impermeability function of the construction project and ensure the quality of the waterproof project Petroleum asphalt polyurethane waterproof coating is most suitable for basement engineering waterproof, toilet and bath room, spray pool, water channel and other engineering waterproof, and also can be used for roof engineering waterproof with rigid protective layer (such as human roof or inverted roof, etc.) The disadvantage of waterproof coating is that the thickness of the coating film is difficult to be uniform, so the construction must adhere to the process principle of "thin coating multiple times, cross coating", and it is strictly prohibited to adopt the method of Jerry building The main properties of asphalt polyurethane waterproof coating are shown in Table 1 2 Key points for construction of asphalt polyurethane waterproof coating 2.1 construction preparation 2.1.1 material requirements for asphalt polyurethane waterproof coating: the content of isocyanate group in component A is 3.5% ~ 4.0%, and the content of curing agent and accelerator in component B is 5% ~ 6% The main physical properties of the waterproof coating and formed waterproof coating shall meet the requirements of Table 1 (2) polyester fiber non-woven fabric is made of polyester fiber as the main raw material and processed by spunbond process It is mainly used as the matrix reinforcement material of asphalt polyurethane waterproof coating Ethylene resin, as the main raw material, is processed by mixing, molding, foaming and other processes It can be mainly used as the soft protective layer of petroleum asphalt polyurethane waterproof coating outside the basement outer wall, and its quality shall meet the requirements of Table 2 2.1.2 construction machines and tools shall be equipped with electric mixer, mixing barrel, rolling brush, paint brush, scale and fire fighting equipment 2.1.3 the construction conditions require that the base course shall be solid, the surface shall be flat and smooth, without sand holes and holes, and shall be clean and dry If there are sand holes and holes, cement mortar shall be leveled It is required to smooth or press the putty filled with 1%~20% cement In case of sanitary ware, wall bushing, etc., they shall be installed firmly as required, with smooth end The construction of asphalt polyurethane waterproof coating is strictly prohibited in rainy days, snowy days or when the base course is wet The construction is not allowed when the wind is above grade 5 or the temperature is lower than 0C 2.2 construction process 2.2.1 after the dust and sundries on the surface of the base course are cleaned carefully, the components a and B of the asphalt polyurethane waterproof coating and the diluent shall be mixed evenly according to the proportion of 1: (1.5 ~ 2.0): 2.0 (weight ratio, the same below), and then the mixture shall be dipped with a long roller brush to evenly brush on the cleaned surface of the base course, without accumulation or exposure , 0.2kg /! 2 or so After painting, it shall be dried and solidified for more than 4H before the construction of the next process 2.2.2 preparation of coating mix material: pour components a and B of asphalt polyurethane waterproof coating into the mixing barrel according to the proportion specified in the specification, and mix them evenly with electric mixer for standby The mixed material should be used as needed, and the prepared mixed material should be used up within 2 hours If the viscosity of the mixed material is too large and it is inconvenient for construction, a small amount of diluent can be added and mixed evenly before painting construction 2.2.3 for the construction of membrane waterproof layer, roll brush or scraper shall be used to scrape the mixed materials on the surface of the base course which has been dried and cured by the base treatment agent in sequence The thickness shall be uniform when scraping When the first coating is cured for more than 5 hours and the finger touch is basically non stick, the second coating shall be scraped again The direction of the second coating shall be perpendicular to the direction of the first coating In case of internal corner connecting plane and facade, polyester non-woven fabric can be laid as carcass reinforcement material for additional reinforcement treatment when necessary General plane base course is suitable for 3-4 times of scraping, each time of scraping is 0.6-0.81 (: 112, facade base course is suitable for 4-5 times of scraping, each time of scraping is 0.5-0.6k/m2 The total thickness of the film waterproof layer should not be less than 2.0mm 2.2.4 protective layer construction basement film waterproof layer protective layer: for the surface of the film on the plane part, a layer of paper-based asphalt felt should be laid for protection and isolation Layer, and 40 mm thick fine aggregate concrete C10 ~ C15 is poured on it as the rigid protective layer, then the steel bar can be bound and the structural concrete bottom plate can be poured; the waterproof coating on the facade of the external wall shall be directly painted on the structural concrete After the thickness of the coating is up to the standard, 5~6mm thick polyethylene foam sheets can be directly pasted before the final coating is solidified, and a tight seam is required to form a soft protective layer Then the backfill is filled according to the requirements of the lime soil, and step by step backfill is adopted to tamp it After the film thickness meets the specified requirements and passes the acceptance, it is advisable to scratch the film mixture again on the film surface, and immediately spread a small amount of clean and dry medium sand to make it firmly bond with the film waterproof layer The construction technology is to stop leakage and prevent seepage The construction method is to ensure that the construction method is jodegui yuan Deming 1 XYPEX waterproof agent 1.1 material performance XYPEX It is an efficient waterproof material produced by XYPEX Chemical Co., Ltd of Canada Its components are Portland cement, treated silica sand and various active chemicals in powder form When in use, after mixing with cement in proper proportion,