Polyurethane waterproof coating as a multi-functional polymer materials, with waterproof layer light, high strength, good elasticity, strong adhesion, high and low temperature resistance, corrosion resistance, easy construction, easy to repair and other advantages. Since the birth of polyurethane waterproof coating, it has been favored and sought after by the market.
Because of the multi-functional polyurethane waterproofing coating and the overall film, it overcomes the shortcomings of the waterproofing membrane need to lap, with the building structure to form a full adhesion of the overall waterproofing effect, to meet the requirements of a variety of building waterproofing projects, suitable for any construction of complex grass-roots construction, especially suitable for shaped structures and pipelines more roof, basement and toilet waterproofing, impermeability, to ensure the quality of the entire project waterproofing impermeability .
Earlier, the Central Economic Work Conference held in Beijing, the conference redefined infrastructure construction, 5G base station construction, ultra-high voltage, intercity high-speed rail and urban rail transit, new energy vehicle charging pile, big data center, artificial intelligence, industrial Internet seven areas defined as “new infrastructure construction” (referred to as the new infrastructure) The new infrastructure.
Based on the excellent performance of polyurethane waterproofing coatings, it has been playing an important role in civil construction, municipal engineering and national infrastructure waterproofing protection, the country’s new infrastructure needs for waterproofing materials to open up a broader space for development.
-The development status of polyurethane waterproof coating-
From the 1980s, with the improvement of science and technology in China and the progress of the chemical building materials industry, polyurethane waterproof coatings have been rapidly promoted, the Beijing Institute of Building Engineering and Shanxi Institute of Chemical Engineering from 1974 to take the lead in theoretical research on polyether-type polyurethane waterproof coatings, combined with the requirements of the bathroom, bathroom floor waterproofing practical research, included in the national “Seventh Five-Year Plan” scientific and technological research program.
In 1985, Shanghai Tunnel Company developed a successful 851-type tar polyurethane waterproofing coating, and a large number of popularized in waterproofing projects, which is China’s section of commercialized polyurethane waterproofing coatings; in 1989, the Ministry of Construction of the national waterproofing materials market consolidation and evaluation, confirming that polyurethane waterproofing coatings become a trusted waterproofing materials, after the 1990s, polyurethane waterproofing coatings have occurred rapid development.
In 1990, China’s Ministry of Construction included polyurethane waterproof coating in the “eight five” plan to implement one of the key projects; in 1991, Shanghai Wet Kwei’s Li Kunquan and Suzhou Building Materials Research Institute Professor Shen Chunlin developed a new polyurethane waterproof coating codenamed 911, the material’s big innovation is to add water as a cross-linking Curing agent, and no longer add coal tar, a toxic substance.
In 1992, the development of building materials industry standards JC 500-1992, and in 1993 began to implement, which greatly contributed to the market for the development and application of polyurethane waterproofing coatings; in 1998, the Ministry of Construction will be tar-type polyurethane waterproofing coatings as a national residential waterproofing materials banned, thus prompting research institutes and production units to upgrade technology.
The market soon appeared a variety of coal tar polyurethane alternative products, including asphalt modified polyurethane waterproof coating, one-component polyurethane waterproof coating, color polyurethane waterproof coating, solvent-free spray polyurethane waterproof coating.
After more than a decade of promotion and development, China’s polyurethane waterproof coating by becoming a complete range of excellent performance of the thriving situation, when the industry standard JC 500 has been unable to meet the needs of market development, in 2003 by the China Building Materials Federation proposed the development of the People’s Republic of China national standard GB/T 19250 “polyurethane waterproof coating.
According to the tensile properties of the product, polyurethane waterproof coatings into I, II category, increased the number of single-component products, additional test items such as tear strength, wet base bond strength, test methods and technical indicators have also made a major adjustment.
With the rapid development of national economic construction in the 21st century, polyurethane waterproof coating in addition to the explosive growth of the civil market, in the field of national key engineering construction has also made leaps and bounds, especially in China’s high-speed rail, subway, highways, water conservancy projects and other key areas, the high performance of polyurethane waterproof coating put forward higher requirements.
Among them in 2005 by the China Construction Materials Joint Institute proposed the development of industry standards JC/T 975-2005 “waterproof coating for road and bridge”, the Ministry of Railways in 2011 the development of industry standards TB/T 2965-2011 “technical conditions for railroad concrete bridge deck waterproofing layer”, both on polyurethane waterproof coating 98% solid content requirements, greatly promoting the polyurethane waterproof coating in The healthy development of domestic.
With the application of polyurethane waterproof coating more and more widely, the product is becoming more and more diversified, in 2013 by the China Building Materials Federation proposed to GB/T 19250 “polyurethane waterproof coating” to revise again, the standard will be divided into three types of products.
Type Ⅰ is usually used for industrial and civil construction projects in general waterproofing, there are two single- and two-component products, the main indicators of tensile strength greater than 2 MPa; Type Ⅱ is usually used for bridges and other non-direct access parts of the bridge deck waterproofing, the main indicators of tensile strength greater than 6 MPa; Type Ⅲ is usually used for bridges, parking lots and other exposed access parts of waterproofing, the main tensile strength greater than 12 MPa. in addition to the standard also increased Burning performance and harmful substances limit test items, to promote a wider application of polyurethane waterproofing coatings in the field of construction.
-Specific applications in the industry –
Building waterproofing industry has been part of the “big industry, small business” pattern. Industry concentration is low, with production licenses (waterproofing membrane need quality and technical supervision for permits, waterproof coatings do not need) more than 1,500 enterprises, there are more than 600 enterprises without a license, the sales revenue of unlicensed enterprises reached 30% of the industry sales revenue.
But with the AQSIQ, the Ministry of Industry and Information Technology and market supervision to strengthen the industry above-scale enterprise income ratio gradually increased, the competitiveness of backbone waterproofing enterprises continue to improve, backward products and production capacity was eliminated. 2016, the industry’s first listed company Oriental rainbow (002271.SZ) operating results of 7.011 billion, an increase of 32.18%.
By 2017 operating income exceeded the 10 billion yuan mark, ranked 3rd in the entire building materials sector, performance increased by 45.62% over the previous year, 2018 should reach 14.2 billion yuan, an increase of 38%, of which polyurethane waterproofing coating production data for the past three years, the annual growth rate is more than over 50%, this set of data is sufficient to illustrate the market horse effect in the construction waterproofing industry is staged .
In 2017, with Karen shares (300715.SZ), Feilu shares (300665.SZ), Keshun shares (300737.SZ) listed on the GEM, while three trees (60373.SH), Weixing shares (002003.SZ) have also announced the establishment of waterproofing coatings and coil production lines, announced a formal entry into the waterproofing market, the next few years will have More and more funds into the waterproofing industry, the building waterproofing industry ushered in a new competitive landscape.
At present, more than 5,000 domestic waterproofing material manufacturers, including waterproof coating manufacturers nearly 2,000, due to the relative difficulty of production technology, production equipment and industrial and technical personnel requirements are high, the market can produce polyurethane waterproofing coatings less than 200 companies.
For polyurethane waterproof coating, since its birth has been supported by the national industrial policy and the market, from the 1990s, the annual output of several tens of thousands of tons, growing to the annual output of more than 100,000 tons at the beginning of the 21st century, and then in recent years, the annual output of several hundred thousand tons of market size, showing the advantages of polyurethane waterproof coating products in the field of construction.
And manufacturers and market demand is mainly concentrated in the coastal economically developed provinces, especially in Guangdong, Shanghai, Jiangsu, Beijing, the standing volume has exceeded half of the total market, indicating that the more mature the market for high-performance products, the more robust demand.
In recent years, due to the accelerated pace of urbanization in China, the continued investment in the country’s major infrastructure and the development of the real estate industry, the application of building waterproofing materials is becoming more and more widespread.
According to China Construction Waterproofing Association statistics, China’s waterproofing materials market annual demand of more than 2 billion m2, waterproofing market output value in 200 billion yuan. Waterproofing materials are mainly divided into waterproofing membrane and waterproof coating two categories of products, including waterproofing membrane accounts for about 62.8%, waterproof coating accounts for about 27.8%, the annual growth rate of polyurethane waterproof coating in recent years has remained at about 10%, showing a good momentum of development.
Policies and regulations
Polyurethane waterproof coating is a solvent-based products, the main policy risk from the product VOCs emissions. From the national laws and regulations and macro policy level, China’s attention to VOCs governance and control began at the end of the “Eleventh Five-Year Plan”, and in the “Twelfth Five-Year Plan” period began to improve the laws, regulations and technical policies. 2017 the State Council issued the “Thirteenth Five-Year Plan”. “Thirteenth Five-Year Plan” comprehensive work plan for energy conservation and emission reduction, VOCs will be included in the emission reduction targets, and proposed that by 2020 the total emissions of VOCs than in 2015 by 10%.
Polyurethane waterproofing coatings currently implemented standard GB/T19250-2013 on the limit of harmful substances put forward clear requirements, which require VOC less than or equal to 50g / L, Class B requirements VOC less than or equal to 50g / L.
In accordance with the “12th Five-Year Plan”, some local regulations have been introduced, December 15, 2014 Shenzhen released SZJG48-2014 “building decoration coatings and adhesives harmful substances limit” standard, requiring polyurethane waterproofing coatings VOC less than or equal to 150g / L; published in 2017 Beijing, Tianjin and Hebei DB11/3005-2017 “building-type coatings and adhesives volatile organic compound content limits”, the polyurethane waterproofing coating VOC less than or equal to 100g / L requirements.
From the national macro-industrial policy, the 2015 national “Thirteenth Five-Year Plan” development plan outline will continue to promote the development of polyurethane waterproofing coatings as a key species.
Polyurethane waterproof coating raw materials status
At present, the domestic polyurethane waterproof coating is mainly composed of pre-polymer, plasticizers, inorganic fillers, pigments, crosslinkers, diluents and additives. Prepolymer by poly(propylene oxide polyol) (i.e. PPG) and diisocyanate monomer condensation, of which polyether polyol domestic brands, mainstream manufacturers are Fushun Petrochemical, Tianjin Petrochemical plant, Blue Star Dongda, Wanhua Chemical, a Novelty, etc..
Commonly used isocyanate monomers are liquefied MDI (mainly including MI-50 of Wanhua, MIPS or MI-50 of BASF) and TDI (mainly including T-80 of Wanhua Chemical and BASF); plasticizers are chlorinated paraffin and phthalate esters; inorganic fillers are mainly one or a combination of microfine calcium carbonate, talc, kaolin; cross-linking agents are mainly MOCA of Xiangyuan Chemical. Diluents mainly use aromatic solvents, such as S100 or S150; additives include catalysts, dispersants, defoamers, latent curing agents, etc.
As there has been a problem of overcapacity in the construction market, serious homogenization of products and fierce competition, most manufacturers still take the production of environmentally unfriendly materials due to cost factors.
The first is the main production raw material toluene diisocyanate (TDI), volatile, with a strong irritating smell, toxic, irritating to human mucous membranes, large doses will cause mucous membrane congestion, individuals will have allergies; followed by diluent, in many small cities or inland provinces still take toluene, xylene and other toxic solvents to reduce viscosity.
In addition, including coal tar, which is explicitly prohibited by the state, is still secretly produced and sold. If the use of these harmful raw materials to produce polyurethane coatings used in indoor and underground space, easy to produce safety hazards and personal injury accidents.
Polyurethane waterproof coating production status
At present, the domestic polyurethane waterproof coating intermittent production mode, in terms of production equipment, mainstream manufacturers to take a multi-level platform approach to the production process to split, a platform for the ingredients and pre-dispersion kettle, secondary platform for dehydration kettle, three-level platform for the polymerization kettle, which can improve product production efficiency and reduce production energy consumption.
The main bulk raw materials of polyether polyol, plasticizer, diluent and powder can be measured and conveyed by PLC control, while the auxiliaries and isocyanate monomer are conveyed by vacuum or artificial material, which is mainly because the reaction activity of isocyanate monomer is relatively high and the storage period is short, while the amount of auxiliaries added each time is too small to be suitable for storage tank storage.
The advantage of taking PLC control is stable product quality and high production efficiency, but at the same time, the equipment investment is relatively large, not quite suitable for small and medium-sized enterprises with small production capacity. Enterprises with large production capacity generally take tanker truck transportation plus storage tank storage of raw materials, which can save a large part of the material costs.
-Outlook –
Polyurethane waterproof coating product development direction
Under the dual pressure of environmental protection and security, the building waterproofing industry is speeding up the reshuffle and the process of the stronger, with the introduction of advanced technology and the establishment of joint ventures, foreign companies brought scientific management and thoughtful after-sales service, for the domestic production and operation to provide an opportunity to learn and learn from.
For many enterprises, advanced foreign technology can not only stay on the introduction, but also to digest, absorb, innovate and develop their own core competitiveness, the future development of polyurethane waterproof coating trends include the following aspects:
(1) technological innovation will become the main way to compete in the future. With the growth of labor wages, the development of polyurethane waterproofing coatings that can dry quickly and can reach the construction thickness at a time, will receive market favor because of the construction schedule savings;.
(2) most of the polyurethane waterproofing coatings on the market are aromatic products, can not be directly exposed to the atmosphere, with the rise of the repair market, can be exposed to polyurethane waterproofing coatings will become the new darling of the future retail channels;.
(3) green environmental protection is the eternal theme of building materials, from raw material screening and process improvement, change the production and application of polyurethane waterproof coatings, the development of water-based, powdered, UV-curable low VOC coatings, to effectively protect the health of workers and customers, to protect our environment.
Polyurethane waterproof coating market prospects
With the growth of investment in the country’s traditional infrastructure and new infrastructure, waterproofing materials have also ushered in new opportunities. Among the 2019-2025 subway investment growth rate will reach more than 20%, according to the waterproofing materials company experience data, subway construction is mainly underground projects, its waterproofing materials unit consumption is high, subway platform (per seat) and subway tunnel (per kilometer) using waterproofing materials value of about 1.5 / 1 million yuan, respectively.
Summary
The next few years, driven by the comprehensive underground corridor, rail transit construction, housing construction, existing building upgrades and other projects, the waterproofing industry in the short and medium term is still in the high-speed growth phase, the demand for waterproofing materials will certainly maintain a certain growth rate.
In addition, with the establishment and improvement of the home improvement market, as well as the rise of the maintenance market, as the main product of the retail channel waterproof coatings in the sales market is growing rapidly, is also bound to drive the growth of polyurethane waterproof coatings.
