<b>Wait for the flowers to bloom: the application and promotion of polyurethane in domestic building insulation</b>

Introduction—— On March 29, the Ministry of Housing and Urban-Rural Development (Ministry of Housing and Urban-Rural Development) issued the "Notice on Strengthening Green and Low-Carbon Construction in County Towns (Public Consultation Draft)" notice. The notice proposed that limit the height of residential buildings in the county. The height of residential buildings in county towns should match the fire rescue capabilities. The new housing in the county is 6layer-based,6The proportion of residences with floors and below should not be lower than75%. The highest new housing in the county is not more than18 layer. Really need to build18For residential buildings above one storey, strict and full demonstrations shall be made, and the construction of fire emergency response and municipal supporting facilities shall be strengthened.

In addition, the opinion also pointed out that we should vigorously develop green buildings and building energy conservation. The new buildings in the county should generally meet the basic level of green building requirements. Encourage the development of star green buildings. Accelerate the implementation of green building and building energy-saving standards, strengthen design, construction and operation management, and continuously increase the proportion of green buildings in new buildings. Promote energy-saving renovation and functional improvement of old communities. Vigorously promote the application of green building materials. Promote new construction methods such as prefabricated steel structures. Improve the efficiency of energy use in counties, vigorously develop renewable energy that adapts to local resource endowments and needs, promote the application of clean energy, promote clean heating in northern counties, and reduce the proportion of traditional fossil energy in building energy consumption.

It can be seen that the state is vigorously encouraging and advocating the development of green and energy-saving buildings. The restriction on building height will also benefit the promotion of polyurethane in the field of building insulation. According to Tiantian Xiaobian from many industry promotion experts, polyurethane The reason why the application and promotion of materials in the field of building insulation in European and American countries is better than that in China is also related to the lower height of foreign buildings (lower building heights are easier to control fires, and the requirements for flame retardancy of insulation materials are not too strict) .

External wall insulation materials are included in the national key industrial products Regulatory Directory

Shortly before the above notice was issued, that is, on March 14, 2021, the State Administration for Market Regulation issued the "National Key Industrial Product Quality Safety Supervision Catalog (2020 Edition), which included external wall insulation materials in the national key industrial product supervision catalog. It is required that "on the basis of safety assessment, according to the level of product quality and safety risks, measures such as strengthened supervision and spot checks, production licenses, law enforcement and anti-counterfeiting, certification and accreditation, risk monitoring, and defective product recalls shall be adopted." This will force the thermal insulation wall material industry to accelerate Product and technology innovation.

Shortly after the State Administration for Market Regulation issued this catalogue, Chongqing It also issued a document prohibiting the use of external wall insulation.

Chongqing: March 2021 On the 26th, Chongqing City issued the "Notice of the Chongqing Municipal Housing and Urban-Rural Development Committee on Relevant Technical Requirements for Prohibited and Restricted Civil Building External Wall External Insulation Engineering". Thin plaster external wall thermal insulation system and external wall thermal insulation and decoration integrated system fixed only by bonding and anchoring methods will be banned from 2022.
Jiaxing:November 2020 On the 25th, Jiaxing City issued the "Notice on Further Regulating the Use of Energy-saving Thermal Insulation Materials (Products) for Civil Buildings in China", which clearly restricted the use of external thermal insulation systems for external walls from three aspects: product materials, construction techniques, and places of use.>The rigid foam roof is formed by on-site foaming, the process equipment is simple, the operation is convenient, it can be sprayed or poured, and it can be used for any complicated roof construction. Usually, the construction is done by 3-4Manual operation, can be sprayed every day20More than cubic meters, according to the thickness of the sprayed layer30 Calculated in millimeters, it can spray about 700more than square meters, more than laying traditional materialsThe work efficiency is increased by ten times, and at the same time, the labor intensity is reduced, the working environment is improved, and the pollution to the environment is reduced. PUThe on-site foaming expansion volume of hard foam liquid raw materials is15-18 times, so the amount of raw material transportation is small. According to statistics, it can be reduced by 80% The above vehicle transportation costs also greatly reduce the workload of vertical transportation shifts at the construction site.

4, good engineering quality and long service life:PUHard foam is a dense microcellular foam with a closed cell rate of up to 92% above, with smooth self-crusting, is an excellent impermeable material, using direct spray molding technology in construction, The polyurethane rigid foam layer without joints forms a complete impermeability, which fundamentally eliminates the possibility of roof water seeping in from along the joints. PUThe hard foam layer can be firmly bonded to the base layer, and its bonding strength can exceed the tear strength of the foam itself, so that PUThe hard foam is integrated with the base layer, which is not easy to delaminate, and avoids the water along the interlayer penetration. And these features are manyWaterproof membrane does not have. Traditional roofinsulation materialEasy to absorb water and moisture, conventionalWaterproof membraneThe service life is very long Short, must be regularly maintained and replaced; and PUThe service life of hard foam can reach 10 more than 10 years, the maintenance cost savings during this period is considerable.

Polyurethane has broad prospects in the field of building insulation:

Polyurethane panels in the field of building insulation are divided into PUR panels and PIR panels . From the perspective of flame retardancy, PUR boards rely on flame retardants to meet fire performance requirements. PIR boards have excellent flame retardancy. The latter is regarded as the mainstream material in the construction industry and can be used for slope and flat roofs, sandwich walls and floor etc. In the North American market, PIR panels are mostly used, especially in the application of roofs and walls. In the European Union, although rock wool and glass wool are mainly used in occasions where flame retardant grade A is required, polyurethane sheets, especially PIR sheets, are the fastest growing materials. According to estimates by industry experts, the total volume of PIR foam in Europe and the United States will reach about 1.25 million tons in 2019. If converted according to the per capita consumption of PIR sheets in Europe and the United States, the potential market capacity in China can reach about 1.5 million tons.

In spite of this, polyurethane is currently used in the field of building insulation (civil, public Facilities and industrial plants, etc.) are still limited in application, but as mentioned above, the development potential of polyurethane in the field of building insulation has attracted much attention and expectations in the industry. Co-sponsored by Shanghai Polyurethane Industry Association and Tiantian Chemical Network, the 2021 Yangtze River Economic Belt Building Thermal Insulation Polyurethane Application Summit Forum will be held in Shanghai on April 22, 2021. Experts and teachers from China Building Energy Conservation Association, China Polyurethane Industry Association, China Building Standard Design and Research Institute, Tongji University and other associations and universities, and senior leaders of technology application and market from polyurethane enterprises, will Share the application experience of polyurethane in building thermal insulation, and discuss the development trend of polyurethane in the domestic construction field. If you want to know the detailed agenda of this summit forum, please call the conference affairs group: 13917244048, Ms. Wu
�, PIR panels have excellent flame retardant performance, and the latter is more regarded as a mainstream material in the construction industry, which can be used for slope and flat roofs, sandwich walls and floors. In the North American market, PIR panels are mostly used, especially in the application of roofs and walls. In the European Union, although rock wool and glass wool are mainly used in occasions where flame retardant grade A is required, polyurethane sheets, especially PIR sheets, are the fastest growing materials. According to estimates by industry experts, the total volume of PIR foam in Europe and the United States will reach about 1.25 million tons in 2019. If converted according to the per capita consumption of PIR sheets in Europe and the United States, the potential market capacity in China can reach about 1.5 million tons.

In spite of this, polyurethane is currently used in the field of building insulation (civil, public Facilities and industrial plants, etc.) are still limited in application, but as mentioned above, the development potential of polyurethane in the field of building insulation has attracted much attention and expectations in the industry. Co-sponsored by Shanghai Polyurethane Industry Association and Tiantian Chemical Network, the 2021 Yangtze River Economic Belt Building Thermal Insulation Polyurethane Application Summit Forum will be held in Shanghai on April 22, 2021. Experts and teachers from China Building Energy Conservation Association, China Polyurethane Industry Association, China Building Standard Design and Research Institute, Tongji University and other associations and universities, and senior leaders of technology application and market from polyurethane enterprises, will Share the application experience of polyurethane in building thermal insulation, and discuss the development trend of polyurethane in the domestic construction field. If you want to know the detailed agenda of this summit forum, please call the conference affairs group: 13917244048, Ms. Wu