New products and new technologies•Analysis report on the application of architectural reflective and thermal insulation coatings in 2019

Directly or indirectly affected by human activities, the concentration of greenhouse gases continues to rise, leading to frequent occurrences of high temperature and extreme weather around the world in recent years, posing a threat to the living environment of residents.
With the implementation of the country’s policies to promote energy conservation and environmental protection industries, people’s awareness of energy conservation is increasing day by day, especially building energy conservation has been paid more and more attention.
Domestic provinces and cities have successively introduced energy-saving regulations for industrial and civil buildings.
In the coating industry, the variety that can better reflect building energy-saving is architectural reflective insulation coatings.

1.
Overview of architectural reflective thermal insulation coatings Architectural reflective thermal insulation coatings isolate solar energy by reflecting visible light and infrared light to achieve the purpose of thermal insulation, including thermal insulation middle coating, reflective thermal insulation flat coating and reflective insulation Thermal texture finish.
Specifically, by selecting suitable resins, metals or metal oxides (nano materials) and other functional fillers, a specific production process is used to prepare high-reflectivity coatings, which have the dual functions of decoration and heat insulation, and are functional coating.
1.
Development status of reflective thermal insulation coatings The application of reflective thermal insulation coatings in China began in the late 20th century from the application of metal storage tanks for petroleum and liquefied natural gas and oil pipelines in chemical fields.
After their success, they have attracted the attention of people in the construction industry.
And began to be used in building roofs, exterior walls and building materials in the early 21st century.
In order to make the market standard and orderly, in 2010, the National Quality Supervision Department formulated GB/T 25261-2010 National Standard for Reflective Thermal Insulation for Buildings, and in 2014 the Ministry of Construction formulated JC/T 235-2014 Industrial Standard for Reflective Thermal Insulation Coatings for Buildings.
, The heat insulation indicators are mainly solar reflectance and hemispherical emissivity.
Architectural reflective thermal insulation coatings were not paid attention to in the early stage and failed to be widely used.
By 2006, the Ministry of Construction launched the "Regulations on the Energy Conservation Management of Civil Buildings".
After the country began to enforce building energy conservation, as building reflective thermal insulation coatings can meet some of the requirements for building energy conservation, its application area has been expanded and the application volume has increased, and the application technology Relevant technical standards have been promulgated and implemented successively.

2.
Scope of application of reflective insulation coatingsThermal insulation coatings are mainly divided into barrier thermal insulation coatings, reflective thermal insulation coatings and radiation thermal insulation coatings according to different thermal insulation mechanisms.
Reflective heat-insulating coatings use the high reflection effect of the coating film on light and heat to reflect most of the sun's energy on the coating film instead of being absorbed by the coating film.
At the same time, the thermal conductivity of this type of coating film itself is small, which prevents the conduction of heat through the coating film.

Reflective thermal insulation coatings are mainly used in thermal insulation in the field of construction engineering, that is, the use of highly reflective thermal insulation coatings on the surface of the outer protective structure can reduce the absorption of solar radiation heat by the building and prevent the surface of the building from absorbing solar radiation.
The resulting temperature rise reduces the heat transfer into the room.

2.
Progress in the application of architectural reflective thermal insulation coatings As it involves the calculation of building energy saving, compared with ordinary coatings, the application technology of architectural reflective thermal insulation coatings is more important, and sometimes even becomes a key factor restricting its application.
Its application technology mainly includes the analysis of the composite external insulation system in the engineering application, the evaluation of the actual energy-saving effect of the coating project, etc.
1.
Thermal insulation coating composite thermal insulation system In hot summer and warm winter areas, architectural reflective thermal insulation coatings can be used alone; while in hot summer and cold winter areas, the coating needs to be combined with other thermal insulation materials to form an external wall insulation system to meet Building energy-saving requirements, such as thermal insulation putty-architectural reflective thermal insulation coating system, thermal mortar-architectural reflective thermal insulation coating system, building reflective thermal insulation coating combined desulfurized gypsum light aggregate mortar system, etc.
on the market.
 2.
Energy-saving effect of thermal insulation coating project.
Under the strong solar radiation in summer, architectural reflective thermal insulation coating can effectively reduce the temperature of the outer surface of the building envelope and reduce energy consumption.
Compared with ordinary paints of the same chromaticity, the use of dark reflective heat-insulating coatings can greatly reduce building roofs and exterior walls in summer to achieve energy-saving effects; while in winter when the solar radiation intensity is not high, reflective heat-insulating coatings The average temperature difference on the surface of ordinary paint with the same chromaticity is only 1-2℃, which has little effect.

At present, some researches on the energy-saving effect of reflective insulation coatings for buildings can obtain the results of obvious energy-saving effects, but there are more qualitative and less quantitative results.

Third, the advantages and disadvantages of architectural reflective insulation coatingsAs a new type of energy-saving material, reflective thermal insulation coatings can be widely used in building exterior walls and roofs.
It can effectively reflect, block, and radiate the energy of sunlight, significantly reduce the indoor temperature of buildings, and reduce the high temperature of air conditioning and other cooling equipment The energy consumption under the conditions not only improves the living environment but also saves a lot of energy.
1.
Advantages of reflective thermal insulation coatings 1) Thermal insulation and cooling can reflect sunlight and heat, reduce its heat transfer, and block the communication between outdoor and indoor temperatures, thereby reducing indoor temperature;  2) Environmentally friendly and beautiful, it is a new type of environmentally friendly and energy-saving material, which does not contain Harmful substances to the human body, will not cause pollution to the environment, and the diversity of colors can well beautify and decorate the exterior walls of buildings, which is environmentally friendly and beautiful;  3) Durable, belongs to exterior wall coatings, and is resistant to weathering, acid and alkali, Anti-aging and waterproof hardness are all required to be high, not only to achieve the performance of advanced exterior wall coatings, but also to have the function of heat insulation and sun protection; and durable, not easy to change color and crack; 4) Convenient construction.
The process is simple and the operation is relatively easy during the construction process.
Convenient, can effectively shorten the construction period, save man-hours, and reduce costs.
2.
Insufficiency of reflective insulation coatings 1) In hot summer and cold winter areas, the solar radiation heat of the wall or roof will be reflected in winter, which is not conducive to energy saving and has certain geographical limitations; 2) Thermal insulation performance and painted surface Flatness has a lot to do.
The smoother the surface of the coating film, the better the heat insulation effect, and the higher the construction quality requirements; 3) The market has less knowledge about the energy-saving effect of this new material, and it can reflect solar heat.
Doubt, awareness needs to be improved.
4.
Project cases of architectural reflective and thermal insulation coatingsAccording to the monitoring data of the big data cloud platform of Youcai, well-known real estate companies such as Vanke, Country Garden, Sunac, Greenland, Longhu, and Xuhui have applied reflective thermal insulation coatings in their development of residential products, and are paying more and more attention to reflective thermal insulation In the recruitment and procurement of coatings, the reflective and thermal insulation coatings of Chenguang, Kaisheng, Meitus, Dewitt, Xiaguang, Valspar and other brands have a higher application rate in the project.
In addition, public facilities such as hospitals, schools, research institutes, etc.
have also adopted a large number of reflective thermal insulation coating products.
Fifth, the development prospects of architectural reflective thermal insulation coatings Architectural reflective thermal insulation coatings are a new type of functional coatings.
With the rapid development of science and technology, the continuous improvement of product quality, and the continuous improvement of related standards, the market's recognition of reflective thermal insulation coatings will gradually increase.
The vigorous development of building thermal insulation coatings and related technologies has a wide range of application prospects.
1.
The main brands of reflective thermal insulation coatings.
2.
The development trend of reflective thermal insulation coatings.
In recent years, under the impetus of high-tech applications, building thermal insulation coatings have developed rapidly.
With the development of organic polymer resin synthesis technology and nano-material technology, new thermal insulation coating products are constantly being developed.
From the perspective of the development of the entire coating industry, architectural reflective thermal insulation coatings will become environmentally friendly, composite, and multifunctional.
Intensified development in the direction of sex.
1) Environmental protection Due to the increasingly stringent environmental regulations and the continuous improvement of people's requirements for the living environment, the corresponding requirements for coatings are also getting higher and higher, and environmentally friendly coatings are the key development direction of architectural coatings.
As a kind of functional coatings, reflective thermal insulation coatings are also environmentally friendly.
 2) The composite type has a deeper understanding of the optical performance of a single pigment through the research and experiment on the optical properties of high-purity pigments, and then develops various high-performance composite pigments and fillers through special processes to make the optical efficiency of reflective thermal insulation coatings more efficient.
High and better effect.
 3) Versatility Versatility has received more and more attention in architectural coatings.
In addition to heat insulation for buildings, reflective thermal insulation coatings should also have other additional functions, such as waterproofing and anti-seepage, high pollution resistance, and fire prevention.
Flame retardant, anti-carbonization, anti-mildew and other functions.
  Reference materials:1) JG/T 235-2014 "Reflective and Thermal Insulation Coatings for Buildings"  2) GB/T 25261-2018 "Reflective and Thermal Insulation Coatings for Buildings" 3) JC/T 1040-2007 "Reflective and Thermal Insulation Coatings for Building Exterior Surfaces" 4) JGJ/T 359-2015 "Technical Regulations for the Application of Reflective Thermal Insulation Coatings for Buildings" | Liu Shaohu , Wang Lei, Research Specialist of Ucai Big Data Research Institute