Application of medium plastic core special pigment in coatings

Medium core pigment thermal reflective waterproof coating is a water-proof energy-saving coating produced by waterborne acrylic emulsion and excellent reflective material. The medium plastic core thermal reflection waterproof system adopts the system of 1 base layer and 1 surface layer, which can not only achieve waterproof and protection, but also have good heat insulation function, but also have strong anti contamination ability.

The test results of the National Building Materials Test Center show that the medium plastic core thermal reflection waterproof coating can reflect 86% of the sunlight, with a hemispherical emissivity of 87%, and can quickly emit the heat accumulated by the substrate.

There are many colors available except white. The top coat adopts special reflective pigment (such as medium plastic core functional black pigment (Applied in paint, ink and heat insulation king) energy saving and environmental protection / Chinese brand / world quality cpcnop ® Black L 0084 (infrared reflective pigment black 34) cpcnop ® Black L 0086 (infrared reflective pigment black 33) cpcnop ® Black k0087 (infrared reflective pigment black 31) cpcnop ® Black K 0088 (infrared reflection absorption pigment black 32) website: www.cpc1688.com (national hotline: 4008307608) enables dark colors to reflect sunlight like light colors.

Compared with the same color coating, the medium plastic core thermal reflection waterproof coating can reduce the temperature at the surface of the steel plate by 15 ° C or more, and reduce the indoor temperature by 3-7 ° C (the closer it is to the roof, the hotter it is), so as to achieve the effect of energy saving.

UV stability, durable performance retention. The UV curing agent in the surface coating makes its surface dense and smooth, so it has excellent self-cleaning function. The results of q-sun accelerated aging test show that there is very little fading, the reflection and emission properties do not decrease after accelerated aging, and there will be no loss of light and pulverization.

The elongation of waterproof membrane exceeds 200%, the adhesive force (peel strength) with steel plate base exceeds 800N / m, the tensile strength reaches 2MPa, and has good fracture resistance. Good adhesion and crack resistance can also be maintained on the base surface with large base deformation. According to the research of Klaus Mullen National Laboratory and the internal test of China Plastics core (Songshan Lake Materials Laboratory), the "China Plastics core thermal reflection waterproof coating system" can reflect 86% of the sunlight and has a hemispherical emissivity of more than 87%. Generally, it can reduce the surface temperature by 23 ℃, the indoor temperature by 3-7 ℃ and the air temperature on both sides of the surface by more than 9 ℃, Save 20% - 70% of air conditioning cost. Action principle of medium plastic core thermal reflection waterproof coating. The medium plastic core heat reflective waterproof coating projects the visible and near-infrared bands of radiation to the sun, has high reflectivity (the main heat source), and radiates the absorbed heat energy to the external space in the form of long wave, Thus, the energy-saving functional coating material can inhibit the rise of the coating surface temperature and reduce the internal and surrounding temperature of the coating without consuming energy.

1. Basic concept: reflectivity: the percentage of the reflected energy of light in a certain band and its total energy. The reflectivity of different colors is very different. u

Emissivity: the percentage of solar energy absorbed by a material radiated from the material. Materials with low emissivity can gather heat energy, and materials with high emissivity can quickly dissipate heat. The emissivity of different materials also varies greatly

2. Principle of energy radiation (building energy source): in the atom of an object, when the electrons in the bound state transition from the high-energy level to the low-energy level, the energy released by the electronic transition will be radiated to the surrounding with alternating electromagnetic waves. This energy is called radiant energy.

Radiant energy is the result of complex excitation inside an atom. As long as the temperature of the object is higher than absolute zero, it will inevitably emit radiant energy. The above formula shows that the higher the temperature of the object, the more radiant energy will be emitted. Thermal radiation is a heat transfer method that does not rely on any medium and uses electromagnetic waves to transfer heat energy. Radiant heat transfer is a heat transfer process that can be carried out at the speed of light in vacuum. The heat of outdoor buildings mainly comes from solar radiation.

Solar spectrum and radiation characteristics: the distribution of solar radiation spectrum is shown in the figure. The distribution of radiation energy is as follows: the ultraviolet region accounts for 3% of the total energy; Visible light area: 39% of the total energy; The near infrared region accounts for 58% of the total energy. The energy of solar rays is mainly concentrated in the visible and near-infrared regions. Medium plastic core thermal reflective waterproof coating is a kind of spectral selective coating. The coating has high reflectivity, which can reduce the energy absorption on the coating surface and reduce the temperature rise of the coating. At the same time, the coating has the ability to emit the absorbed energy. Therefore, the most effective way to reduce the roof temperature is to use high reflectivity and high emissivity materials (such as medium plastic core heat reflective waterproof coating) heat transfer mode and heat insulation mode.

As we all know, there are three ways of heat transfer: heat conduction, convective heat transfer and heat radiation. In order to reduce the rise of the external environment (mainly solar energy) to the building, the traditional method is to reduce the heat conduction rate by using thermal insulation materials with small heat transfer coefficient to reduce the heat conduction of solar energy to the building.

However, there are the following problems in reducing heat conduction through thermal insulation structure:

(1) Once the heat energy is introduced into the internal space, even if the external temperature decreases, it is difficult to release the heat energy;

(2) The outer wall of the thermal insulation layer is not tightly sealed, and gaps are inevitably left. Moisture and moisture are immersed in the thermal insulation layer along the gaps. Once the thermal insulation structure is damaged, the maintenance workload is large and the cost is high. The use of plastic core thermal reflection waterproof coating technology can avoid the shortcomings of traditional thermal insulation mode. 3、 China plastic core domestic test report: normal gray and medium plastic core thermal reflection waterproof coating gray paint are used for the temperature difference of the inner surface of the roof behind the roof, the temperature difference of the inner surface of the roof (normal gray and reflective gray), and the temperature difference of other thermal reflection waterproof coatings compared with similar color coatings.