Coating knowledge: technical application of high elastic rubber asphalt waterproof coating

Core tip: over the years, polymer modified bitumen has been widely applied in various waterproofing works It has fully demonstrated its excellent performance Besides being characterized by good elasticity, weather resistance, fatigue resistance and aging resistance, it also has the advantages of reliable quality and economy Polymer modified asphalt waterproof materials include polymer modified asphalt waterproof roll and polymer modified asphalt waterproof coating Coil and coating have their own advantages Compared with coil, coating construction is more simple and convenient It is suitable for any shape of base surface and can form a compact seamless coating Therefore, polymer modified asphalt waterproof coating has been widely used in various waterproof projects, and has been developed rapidly 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 Coatings home: over the years, polymer modified bitumen has been widely used in various waterproofing works, which has fully demonstrated its excellent performance Besides being characterized by good elasticity, weather resistance, fatigue resistance and aging resistance, it also has the advantages of reliable quality and economy Polymer modified asphalt waterproof materials include polymer modified asphalt waterproof roll and polymer modified asphalt waterproof coating Coil and coating have their own advantages Compared with coil, coating construction is more simple and convenient It is suitable for any shape of base surface and can form a compact seamless coating Therefore, polymer modified asphalt waterproof coating has been widely used in various waterproof projects, and has been developed rapidly 1 Background: the application of solvent polymer modified asphalt waterproof coating will pollute the environment, be harmful to human health and waste a lot of resources, so the development of water-based environmental protection waterproof coating, such as high-performance water-based polymer modified asphalt waterproof coating is the general trend Due to technical reasons, the traditional water emulsion polymer modified asphalt waterproof coating products are relatively poor in mechanical properties and durability During the construction, because the traditional polymer modified asphalt coating is a single component material, it can only be brushed or rolled on the base layer, and a continuous waterproof membrane will be formed after the moisture volatilization; during the brushing, it can only be applied several times and thinly, which seriously affects the construction progress and increases the construction cost In order to meet the requirements of rapid construction and environmental protection of modern buildings and infrastructure, polymer modified asphalt waterproof coating should be developed in the direction of higher performance and stronger adaptability to base expansion or cracking deformation; the construction method should also be changed from manual painting to the use of mechanical equipment on-site spraying, instant film-forming rapid construction process At present, the rapid development of China's infrastructure construction, especially the construction of high-speed railway, expressway and urban subway, has brought unprecedented opportunities for the development of high-performance waterproof coating The research and development of high-performance waterproof coating and the development and promotion of new supporting construction machinery have been highly valued by the waterproof industry at home and abroad, and its work has achieved initial results Internationally, such products have been developed in the United States, Canada and South Korea, and the supporting spraying construction equipment has been applied; in China, there are also enterprises that have started the technology research, development, production and application 2 Characteristics and technical specifications The spray elastomeric asphalt waterproof coating is a new type of waterproof coating developed and popularized in nearly 10 years and nearly 5 years abroad It is a kind of elastic waterproof coating modified by polymer latex and modified by emulsified bitumen made by special process The method of spraying directly on the project site is adopted in construction The main characteristics of the material are as follows: 1) the film has good elasticity and elongation, the elongation can reach 16 times of its own, and the recovery rate can reach more than 90% See Table 1 for the main technical properties and indexes of the material The technology can solve the leakage and corrosion problems of the structure caused by stress deformation, expansion cracking, puncture or poor connection 2) The coating can completely cover the base course, 100% bond with the base course, no water channeling, no peeling, especially suitable for special structure or complex shape parts, and the construction is relatively simple 3) It has good environmental protection, does not contain benzene, toluene, formaldehyde and other toxic and harmful substances, and has no waste gas emission in the process of production, construction and use It can be applied to Abstract: This paper introduces the characteristics, main technical indexes and comparison with the traditional polymer modified asphalt waterproof coating, and expounds the construction process and application scope of the waterproof coating 。 Key words: polymer modified asphalt waterproof coating; high elastic rubber asphalt waterproof coating; spraying construction; construction application of instant curing confined space 4) Instantaneous forming, using professional spraying equipment construction, saving labor, can greatly shorten the construction period, save construction costs 5) Good adhesion, good adhesion with concrete, steel, wood, metal and other materials 6) The painting methods are various (spraying, brushing and rolling painting), the construction is simple, and it can meet the operation requirements of various details, such as drain outlet, internal and external corners, cracking parts, etc 7) It can be constructed on wet surface to speed up the construction progress of the whole EPC project 3 Different from the traditional polymer modified asphalt waterproof coating 1) different technical performance The traditional polymer modified asphalt waterproof coating has the advantages of low solid content, poor elasticity, small elongation at break, poor resistance to bursting and small application temperature range The present spraying high elastic rubber asphalt waterproof coating has high solid content, good elasticity, recoverability after stretching can reach more than 90%, elongation at break is much higher than the traditional modified asphalt coating, at the same time, it has excellent anti bursting ability, the application environment temperature range has also been expanded, low temperature resistance and high temperature resistance are better, which can meet the requirements of waterproof materials for road, bridge and concrete pavement Temperature requirements See Table 2 for the comparison of the main technical indexes between the traditional polymer modified asphalt waterproof coating which implements the standard of water emulsion asphalt waterproof coating (JC / t408-2005) and the present spraying high elastic rubber asphalt waterproof coating 2) Different construction methods The traditional polymer modified asphalt waterproof coating generally adopts brush coating and roll coating The thickness of the coating can not be too thick at one time It needs several times of brush coating to reach the design thickness Each time of brush coating can only be carried out after the last coating is dry Therefore, the construction speed is slow, the construction period is long, and the thickness of the film is not uniform, which seriously restricts the application and development of the coating The present spraying of high elastic rubber asphalt waterproof coating can be applied and cured quickly, which overcomes the above problems 3) The application range is different The traditional polymer modified asphalt coating is generally not used in subway, tunnel, culvert, landfill, artificial lake water conservancy facilities, as well as more top and facade projects because of its low physical performance index and the limitation of manual brush (roll coating) construction technology Because of its excellent technical performance and the construction technology of on-site spraying and instant curing, the application of high elastic rubber asphalt waterproof coating is more extensive 4、 The construction technology of spraying high elastic rubber asphalt waterproof coating now has changed the traditional construction method of manual painting of waterproof coating The construction technology of spraying on site with professional spraying equipment has ensured the uniformity of film thickness, eliminated the influence of human factors, and made the waterproof more reliable Under normal temperature, a and B two-component materials are composed of main agent and curing agent, which are respectively atomized and mixed at high speed by two nozzles through the pipeline, and the materials are solidified into film immediately after being sprayed to the base surface (Fig 1 shows the mechanism of instant curing and forming during field spraying construction) The daily construction capacity of each spraying equipment can reach 1500-2000m2 on the premise that the construction base surface has the construction conditions, which greatly improves the efficiency of waterproof construction The following describes the construction process of spraying high elastic rubber asphalt waterproof coating on the concrete base for example 1) Construction sequence: Brush high elastic rubber asphalt waterproof coating + non-woven fabric for strengthening treatment in weak parts → spray special primer of high elastic rubber asphalt waterproof coating with dosage of 0.1kg/m2 → spray 1.5mm thick high elastic rubber asphalt waterproof coating as main waterproof with dosage of 2.1kg/m2 → if necessary, brush top coat with dosage of 0.5kg/m2 2) Construction method ① after the base surface is dry, solid and clean, and meets the requirements of spraying construction, brush type high elastic rubber asphalt waterproof coating and non-woven cloth are applied to strengthen the treatment of cracks, corners and other weak parts ② In order to enhance the adhesion strength of high elastic rubber asphalt waterproof coating, a matching primer shall be sprayed before large-area spraying ③ After the primer is completely cured, the special spraying equipment shall be used to evenly spray the high elastic rubber asphalt waterproof coating with a thickness of more than 1.5mm, and the one-time spraying shall reach the design thickness ④ After spraying the high elastic rubber asphalt waterproof coating, if the thickness is not up to the standard or local parts need to be strengthened, it shall be treated by brushing ⑤ According to different protection and beautification requirements of the project, top coat or other protective materials can be applied on the waterproof layer 5 The application range of the present spraying high elastic rubber asphalt waterproof coating is very wide because of the combination of its excellent waterproof performance and the simple and quick process method of on-site spraying construction [focus on WeChat official account "paint net"; pay attention to surprises, scan code to see if your husband is selling paint.. 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