Application of infrared reflective pigments in water-based energy-saving coatings

As a kind of water-based coating, water-based energy-saving coatings have the functions of heat insulation, solar reflection, infrared radiation, etc.
, and have gradually replaced the application status
of traditional thermal insulation materials in the construction industry.

However, China's research on water-based energy-saving coatings is late, and there are problems such as unstable thermal insulation effect, poor weather resistance, poor construction stability and high cost in practical applications, which make it impossible to vigorously promote and apply
in practical applications.

This paper focuses on the online coating coatingol.
com
of improving the performance of waterborne energy-saving coatings by infrared reflective pigments.

Water-based energy-saving paint preparer

Preparation of slurries

(1) Add distilled water, dispersant, and film-forming additive to a beaker and stir well

(2) Add defoamer to the system and stabilize for 30min after eliminating all foaming

(3) Add infrared radiation pigment and titanium dioxide to the solution, paying attention to stirring while adding to ensure that the stirring is even.

(4) Stabilize for 1h after the addition of infrared radiation pigment and titanium dioxide

Preparation of water-based energy-saving coatings

(1) Stir at a speed of 500r/min, and add film-forming agent and leveling agent
in turn.

(2) Stable stirring for 1h to obtain water-based energy-saving coatings

Analysis of experimental results

Comparison of different infrared reflective pigments

In this experiment, the function of titanium dioxide is to improve the whiteness of the coating, so that more visible light can be reflected
.
As follows, the reflection data of water-based energy-saving coatings obtained from different infrared reflective pigments are as follows:

Table 1 Experimental results of different infrared radiation pigments

The analysis shows that the reflectivity and hemispherical emissivity of water-based energy-saving coatings obtained when three infrared reflective pigments are added to the coatings, namely titanium dioxide, barite and mica powder, are higher than the corresponding indexes
of water-based coatings obtained by the other three combined infrared reflective pigments.

Comparison of infrared reflective pigments in different proportions

After studying the combination of the best infrared reflective pigments, it is also necessary to investigate whether there is a difference
in the reflectivity and hemispheric emissivity of the water-based coatings obtained by adding the above three different proportions of infrared reflective pigments.

As shown in Table 2, the radiation data of the resulting waterborne energy-saving coatings at three ratios were studied:

Table 2 Experimental results of different infrared radiation pigments

The analysis shows that the emissivity and hemispheric reflectivity of 2# water-based energy-saving pigments are better than those of 1# and 3# water-based energy-saving pigments
.

Analysis of practical application results

After studying the optimal proportion of infrared reflective pigments, the next step is to verify whether the water-based energy-saving pigments are better than ordinary water-based pigments
.

Experimental methods

Water-based energy-saving coatings and ordinary water-based coatings are applied to the wall of a roof, and the surface temperature of the two coatings is measured by infrared thermal imagers under real-time temperature conditions
.
The measurement results are shown in Figure 1:

Figure 1 Performance comparison of waterborne coatings

Analysis of results

The left side of the figure is the surface temperature of ordinary water-based coatings, and the right side is the surface temperature
of water-based energy-saving coatings with the optimal proportion of reflective pigments.

In contrast, the surface temperature of waterborne waterborne energy-saving coatings is 45.
5 °C
.
The surface temperature of ordinary water-based coatings is 63 °C, and the surface temperature of the wall is 64.
8 °C
.
Therefore, the water-based energy-saving coating prepared by using m (titanium dioxide): m (barite): m (mica powder) = 5 :2 : 3 has a good energy-saving effect
.

conclusion

After research, m (titanium dioxide): m (barite): m (mica powder) = 5 :2 :3 obtained by adding m (titanium dioxide): m (barite): m (mica powder) = 5 :2 :3 The reflectivity and hemispherical emissivity of water-based energy-saving coatings obtained have the best indicators, and their surface temperature is lower
than that of ordinary water-based coatings in actual application.

Therefore, the research on infrared reflective pigments in water-based coatings should be strengthened, and the best combination of infrared reflective pigments at the best ratio should be obtained, which lays a theoretical foundation
for improving the performance of water-based coatings.