(Continued from the previous period) Niu Guangquan product standards and specifications. In 2004, a large number of waterproof material product standards and technical specifications and procedures were formulated and revised. The formulation and revision of these standards and norms will play a positive role in promoting the level of building waterproof technology in China and regulating the market of waterproof materials. The product standards and specifications formulated and revised in 2004 are shown in Table 3. Industrial policies. 1 The Ministry of Construction issued Document No. 227 "Opinions on Strengthening the Management of the Production and Application of Building Waterproof Materials", re-defining the development goals and technical routes of building waterproof materials, and vigorously developing the elastomer (SBS) and plastic (APP) modified waterproofing. Coil, actively promote the polymer waterproof membrane, and strive to develop environmentally friendly waterproof coating.

Research and development of high-end building sealing materials, underground engineering waterproof materials, waterproof materials for urban bridge projects, landfills, and waterproof materials for urban sewage treatment plants; restrictions on the development and use of asphalt composite tire waterproofing materials, polyethylene polypropylene composite waterproofing membrane And asphalt-paper felt linoleum; eliminated tar-type waterproof material and compound base material made of high-alkali glass fiber. The market share of medium-to-high-grade waterproof materials will be enhanced, and the serialization, matching and application of waterproof materials will be systematized to improve the overall level of China's building waterproof technology.

Please refer to Table 4. The State issued the National Construction Waterproof Coil Production Permit (Export) Certificate Implementation Regulations of the Ministry of Construction's No. 218 Announcement "Promotion and Application and Restriction, Prohibition of Use of Technical Bulletins" concerning waterproof materials. The implementation details of the waterproofing coil production license have become the threshold of market access for the waterproofing coil industry. The preparation and release of the "Implementing Rules" is in line with the needs of the state's industrial policies and the current macro-control. It imposes restrictions on redundant construction projects with high resource consumption, low technological level, serious pollution, and oversupply. The equipment threshold is: the annual production capacity of the modified bitumen waterproofing membrane production line is more than 2 million square meters; the annual production capacity of polymer waterproofing membrane production line is more than 1 million square meters; the annual production capacity of paper tar felt production line is more than 1 million rolls.

The above industrial policies further regulate the waterproof material market from the two fields of production and application.

China's building waterproof material industry trends The overall market size forecast for the construction industry. According to the "Eleventh Five-Year Plan" requirements and the World Bank's estimation, by 2010, China's total output value (the turnover) of the construction industry is expected to exceed 900 billion yuan, an average annual increase of 7%, and the added value of the construction industry will reach more than 1.5 trillion yuan. The average annual growth rate is 8%, accounting for about 7% of the GDP. In the medium to long term, the construction industry will still be an industry with broad development prospects.

The urbanization process promotes the development of the construction industry. At present, China is entering an accelerated phase of urbanization. According to the “Eleventh Five-Year Plan” of the Ministry of Construction, the level of urbanization in China will increase by 0.84 percentage points each year. By 2010, the level of urbanization in China will reach 45% and the urban population will reach 630 million. The investment growth brought about by the urbanization process, the construction of new-type urban infrastructure and the reform of the service management system in the urban infrastructure sector will bring new opportunities to the construction and waterproofing industries. In particular, after China's accession to the WTO, the funds and advanced technology brought by foreign companies will not only directly expand and enhance the construction market demand, but also will accelerate the pace of our country’s construction companies in tandem with the international market, allowing Chinese construction companies to enter the large-scale market. The foreign construction market promotes the international operation of the construction industry.

In the next 10 years, China will continue to maintain the constant increase in the total investment in fixed assets.

Table 3 Product Standards and Regulations Developed and Revised in 2004 Approved or Examined Waterproofing Coil Test Methods National Standards Approval Batch Sealing Materials Test Methods National Standard Petroleum Asphalt Plywood Lint National Standard Roofing Technical Specification National Standard Water-based Asphalt Base Waterproofing National standards for coatings have been completed. Asphalt shingles. National standards. Roads for bridges.Waterproofing materials. Industry standard Bridges. Waterproof coatings. Industry standards. Preparation of bituminous waterproofing membranes. Primary treatment agent. Industry standard. Glue Industry Standard Urban Bridge Waterproofing Technical Regulations Industry Standards To be applied to formulate and revise the national standard for elastomer modified bituminous waterproofing membranes Plastic modified bituminous waterproofing membranes National standard Asphalt composite tires Flexible waterproofing membranes National standards Slope roofing engineering Technical specifications Waterproofing Technical Specification for Standard Planting Roofing Projects Industry Standards Table 4 Contents of Waterproofing Materials in the Announcement No. 218 of the Ministry of Construction are listed as waterproof technology and products promoted by the government* SBS or APP modified bitumen waterproofing membrane H type product EPDM rubber (vulcanized type) waterproof sheet PVC waterproof roll () Products Polyurethane Waterproof Coatings Polymer Cement Waterproof Coatings Silicone Structural Adhesives, Silicone, Polysulfide, Polyurethane Building Sealant Bituminous Tiles Concrete Tiles Composite Plastic Tiles Listed as Restricted Use Technologies and Products Petroleum Asphalt Plies Felt Asphalt Asphalt Compounds Flexible waterproofing membrane Polyethylene film with a thickness of 0.5 mm or less Polypropylene and other composite waterproofing membranes Listed as prohibited technology and products S-type polyvinyl chloride waterproofing membrane Tar-type polyurethane waterproof coating Water-based polyvinyl chloride tar waterproof coating Polypropylene, polypropylene, and other composite waterproofing membranes used in the secondary heating production process were constructed. According to the World Bank’s estimation, the funds needed for infrastructure construction in China in the next 10 years will be more than US$270 billion. In particular, China's underground rail transit and tunnel construction have entered a new period of rapid development. Due to its advantages of not occupying ground resources, easing ground transportation, not affecting the landscape, and being environmentally friendly, underground construction projects are on the rise. According to statistics, the current subway lines that have been included in the plans of all cities have reached 1,500 kilometers, and the estimated investment is nearly 500 billion yuan.

real estate. Residential construction will continue to be the focus of investment in the next 10 years and will continue to grow. China will build 640 million 450 million square meters of new residential space each year, and it will reach 800 million square meters by 2015.

Environmental Engineering. With the gradual implementation of the sustainable development strategy, the environmental engineering market has become a market with the greatest potential and development prospects. During the “10th Five-Year Plan” period, the daily treatment capacity of urban sewage shall be increased by 26 million m3, and the daily garbage disposal capacity shall be 150,000 tons. In 2005, the centralized treatment rate of urban sewage will reach 45*%, and the city with more than 500,000 population will reach 60% or more. . After 2005, infrastructure and environmental protection will continue to maintain the momentum of development.

Urban Construction. Beijing's total fixed asset investment during the "10th Five-Year Plan" period will be 800 billion yuan; Shanghai will reach 1,000 billion yuan, of which the scale of major projects will reach 400 billion yuan; and the total investment in Chongqing will be 520 billion yuan. It is estimated that the investment scale of key national provinces and cities in the next 51 years will reach 4 billion yuan.

The operating cycle of the construction waterproofing industry is lagging behind that of the investment and construction industries. The lag period is about 1 year. This conclusion was confirmed by analyzing the correlation of historical data. The industry's total output value curve has undergone unusually severe fluctuations since the mid-1990s. This is the result of the industry's operation of new materials and low-grade materials that were developed at the same time during this period.

According to the World Bank's forecast for China's construction industry, and excluding the impact of price factors caused by the rising proportion of new materials, optimistic and pessimistic estimates are based on the upper and lower limits of the total construction area for waterproof construction (excluding underground engineering), 2010 The main demand for water-repellent materials is shown in Table 5. Table 5 Demand Forecast of Major Water-proof Materials in 2010 Product Category Demand Forecast in 2010 Construction Area / 10,000m2 Total /% New Waterproof Material Total SBS/APP Modified Bituminous Coil Polymer Waterproof Coil Waterproof Coatings Bituminous Lint Tiles Self-adhesive Coil Others Waterproof Material Petroleum Asphalt Paper Felt Yarn Asphalt Composite Tire Pre-roll Total Source: CNBWMIA 2004 China Building Waterproofing Industry Development Report.

The total waterproof construction area will increase from 612 million square meters in 2004 to 735 million square meters, of which the application of new materials in waterproof construction projects will increase from 44.44% in 2004 to 87.76% in 2010 (calculated as waterproof construction area), Annual growth rate of 11.26%. (1) SBS.SBS modified asphalt membrane is the leading waterproof material in China. According to forecast, by 2010, the cost for SBS/APP modified bituminous coils will be approximately 240 million square meters, and it is estimated that most of them are SBS modified waterproofing membranes. If 200 million square meters are used, a 4 mm thick coil will require approximately 4.8 kg/m2 (12% SBS addition). In 2010, the SBS demand will be approximately 96,000 tons.

According to forecasts, by 2010, the demand for polymer waterproofing membranes will be 130 million square meters; the demand for EPDM waterproofing membranes will be about 70 million square meters; if the amount of square meters added is 3.6 kg, 2010 will be EPDM. The demand is about 25,000 tons.

Rubber-based waterproof material problems and recommendations (1) rubber-based modified bitumen membrane. SBS modified bitumen membrane is the leading new type of waterproof material currently used in China. The main problem currently exists is market chaos. Counterfeit and shoddy products flood the market, mainly manifested in the use of composite tires as polyester felt, partially or completely replaced by rubber powder. In SBS, short-filament polyester felts with poor performance were used in place of conventional filament polyester felts that were used in large quantities, resulting in severe deterioration of SBS coils. It is recommended that competent authorities at all levels increase efforts to combat counterfeit and shoddy SBS modified bituminous membranes, eliminate the use of composite tires and rubber powders in SBS coils, and promote the use of filament polyester felts and limit the use of short-filament polyester felts. In addition, the current national standards in the I-type index is too low to give counterfeit and inferior products, it is recommended to modify the modified bitumen waterproofing membrane standards as soon as possible, and properly increase the indicators, so that there is no time to drill. Submerged SBS membranes have to increase the water absorption rate to avoid excessive water absorption caused by the water absorption of the carcass.

The foreign standards for modified bitumen membranes are all specified for multi-storey roofing and waterproofing systems. Multilayers are more reliable than single layers. This is the main advantage of modified bituminous coils. China is keen to use it in single layers and it is commonly used. Millimeters thick (specified 4 mm), so that the quality of waterproof construction is often not guaranteed. It is suggested that the concept be changed. It is stipulated in the standard for multi-layered systems and multi-layered systems are promoted in use. When used in a single layer, the thickness must be 4 mm or more, and a layer of oxidized asphalt mat felt should be added.

Various SBS modified bituminous membranes have been developed for different purposes in foreign countries, and the performance is much higher than that of our country's products. There are special products for different purposes such as roofing, bridges, and waterproofing, but our country's SBS varieties are singular and lack special products. It is suggested to strengthen the research and development work, develop SBS coils for various purposes according to different requirements, and form diversified SBS waterproofing membranes.

In summary, foreign SBS has grown to nearly 100 varieties, and its quality has also improved, which is much less than that of our country. It is recommended that the rubber industry strengthen its technical innovation efforts and work hard to develop or introduce new varieties such as SB, SIS, SEBS and new varieties with better high and low temperature performance.

Foreign self-adhesive SBS modified coils are classified into underground and roofing applications, underground uses no tyres, roofing uses tires, and all performance requirements are high. The development of self-adhered coils in China is relatively late. The underground waterproof technical specifications are limited to the use of tires with SBS and APP modified bituminous membranes. The newly revised roofing technical specification has already mentioned the use of self-adhered coils, but no specific provisions have been made. The self-adhesive membrane index that has been issued is lower than that of foreign countries, and just started, price competition has begun, resulting in a decline in the quality of some products and unsatisfactory long-term adhesion. Recommended foreign experience, in the standard clear underground suitable for non-tire products, roofing with tires, and put forward high standards of technical requirements (such as low temperature flexibility to -30 * C), the product to ensure long-term bonding function, Eliminating the listing of counterfeit and inferior products.

Low-quality products over high-quality products, there are misunderstandings. In recent years, China's polymer waterproofing membranes have made significant progress, but the technical problems appear to be even more than the modified asphalt membranes. The first is the low price of polyethylene-polypropylene composite waterproofing membranes with low prices and low investment in equipment. Many manufacturers have adopted this type of products, resulting in a rapid increase in production. When the annual sales volume exceeds 50 million, it is far ahead of the products advocated by the government. The development of advanced products such as EPDM and PVC.

Second, there is a problem in understanding, and the evaluation of the function and durability of the polymer coil is too high, and a new understanding needs to be made. According to the results of a U.S. expert's study, the durability of polymer coils is not as optimistic as we had previously estimated. The lifespan of the US's low-grade waterproof system is shown in Table 6. Moreover, the effect of local climate on the average durability of roof systems is only Subsequent to the effect of the degree of drainage, especially plastics and rubber sheets show a tendency to decrease the average durability significantly when the average temperature increases, and the average years of durability under different heat loads are shown in Table 7. China has resolved the thermal stability of such coils. Sexual issues lack the necessary awareness and take appropriate measures to overestimate their durability.

Table 6 U.S. Low Grade Roofing Waterproof System Service Life Year System Average Minimum Value 5 Houses 5 95% Roof Estimated Service Life Upper Limit Asphalt Fiberglass Mat Layered Roof SBS Modified Bituminous Asphalt Pavement Stacked Roof Spray Polyurethane Foam APP Asphalt Table 7 Average Years of Durability Under Different Heat Loads Year Temperature Material Heat Load/C Asphalt Fiberglass Mat Layered Roof SBS Modified Asphalt Asphalt Plies Tilted Roof Sprayed Polyurethane Foam APP Modified Asphalt 2 Rubber-based Waterproofing Membrane EPDM waterproofing membrane. EPDM waterproofing membranes should become the dominant or important waterproof material in polymer webs. Compared with foreign countries, the use of EPDM in China is limited (8 million m2), while the use of foreign countries, especially in the United States and Japan, has a large proportion. For example, the annual application of Carlisle-House Company in the United States amounts to 60 million m2. Therefore, there should be a large amount of development.

The quality of the products of large manufacturers in China generally meets the standards, but some small manufacturers who come late will produce a lot of inferior products that need to be combated and stopped.

China's EPDM has only a single long-term product. It is only 1.2 meters wide in width and has no wide-width products. It is only homogenous in its variety, and it is not reinforced and backed. It is limited to the construction method, and it is mechanically fixed. Law and loose paved top method are rarely used. It is recommended that enterprises pay attention to technological innovation and increase investment in research and development. It is recommended to develop reinforced and back-lined products and actively adopt mechanical fixing methods and loose-sandwich pressing methods.

Although the supporting materials for EPDM have progressed, they are still not complete enough, such as no special flooding materials, protective coatings, fixtures, and construction equipment. It is suggested that U.S. experience develop various supporting materials and construction equipment to form a complete material supporting system.

China’s long-term belief in the judgment of Japanese technicians suggests that EPDM can be used for 50-70 years. The actual situation is far from this. Table 6 and Table 7 show that the average service life of EPDM roofs is only 14.2 years. Durability under 17*C and 27*C heat loads was 15.4 years and 12.0 years, respectively. The experience of the United States is worth learning from. The heat aging test conditions of American black products are 670 hours at 116C, and the products have been improved. As a result, durability has increased. Large manufacturers have provided a guarantee period of 20 years. The heat aging conditions in our country are only 168 hours under 80C, and there is a big gap. It is recommended to increase the test requirements and continuously improve the quality of products in order to help extend the life of the roof and the export of products.

EPDM is mainly used for roofing, but it can also be used underground. The requirements of the two are different. It is recommended to produce underground-specific products and develop EPDM standards for underground use.

The quality of EPDM raw materials in China is not as good as that of foreign manufacturers. It is recommended that improvements be made to improve the quality of EPDM materials to replace foreign products.

Butyl rubber waterproofing membrane. China knows very little about butyl rubber waterproofing membranes and produces few products. At present, only one company produces, the standard is not standardized, and the index is low. In fact, butyl rubber waterproofing membranes are suitable for waterproofing underground because of their airtightness and watertightness. The overall functional capability is better than that of EPDM, and the roofing is inferior to EPDM. Therefore, it is recommended to pay attention to the development of butyl rubber waterproofing for underground waterproofing. Coil and the United States standard (ASTMD6134-97), developed China's underground waterproof butyl rubber waterproof membrane industry or national standards.

TPO waterproofing membrane. TPO waterproofing membranes have the advantages of both rubber and plastics, and have excellent performance. It is the most sustainable waterproof material with the most environmental protection and the most comprehensive performance in waterproofing membranes. It is naturally favored by all countries and has developed rapidly. However, due to the high prices in China and the lack of production in domestic raw materials, most companies generally adopt a wait-and-see attitude despite long-term propaganda. Only one company has developed this product and has produced homogeneous products. It is still not fully in line with the United States' newly issued ASTM standard, which has a wide gap with foreign countries.

It is recommended to have more waterproof material companies, to recognize the advantages of this product, to involve in the development and production of TPO, to build a 2 meter wide production facility first, so that this kind of product with good prospects for development can also form a certain market scale in China. .

According to foreign experience, TPO waterproof material has three kinds of homogenization, reinforcement and backing type. The most popular and successful use of enhanced type is to suggest that the product development should be based on enhanced type.

TPO materials for TPO waterproofing materials are not yet available in China. In order to meet China's need to develop such products, it is recommended that Chinese petrochemical companies introduce foreign equipment and technologies for the production of such raw materials as soon as possible to lay the foundation for their development. At present, the use of raw materials for foreign companies is relatively stable, and the development process of EPDM waterproofing membranes is roughly the same, making TPO waterproof membranes a good start.

Polyurethane waterproof coating. China's polyurethane waterproof coating production has a considerable scale, the current priority is to adhere to the standard, two-component reaction type, should not add or less solvent, strive to reach 95% or more solid content, construction should not be added solvent To prevent fire or personal accidents. One-component benzene solvents should be banned and there should be strict regulations on VOC content. It is recommended to promote and improve the existing water-curing polyurethane waterproof coatings and develop new varieties of polyurethane, such as exposed PU waterproof coatings.

Acrylic waterproof coating. Acrylic waterproof coating should use elastomer-based acrylic emulsion as base material, and strive to improve the paint's anti-pollution, to avoid the problem of discoloration in the short term. It is recommended to study the special products needed for roof and wall surfaces. The problem of wall penetration currently occurs from time to time, and it is recommended to study new acrylic and silicone-based wall surface repair waterproof coatings.

Spray polyurethane foam on site. China's on-site injection of polyurethane foam has a low closed cell porosity, which can not reach more than 95% of the closed cell rate. It can only be said that it is a thermal insulation material and cannot be considered as a thermal insulation and waterproof integrated material.

It is suggested to develop a material that can really play a role in waterproofing, and to establish standards and construction specifications for in-situ polyurethane foam insulation and waterproof materials in China. mouth

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