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Near-infrared reflectance, transmittance and absorptance determination methods of coatings

A measurement method and infrared reflection technology, applied in the direction of transmittance measurement, scattering characteristic measurement, measuring device, etc., can solve the problems of no reflection and heat insulation effect

Active Publication Date: 2019-08-06
JIANGSU TOP FINE NEW RAW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A typical example is to make black paint with permanent yellow, permanent red and phthalocyanine blue in a mixing ratio of 5:2:1. Reflectance is 0.89) on the film making, the near-infrared reflectance of the coating obtained is 0.68, has very good near-infrared reflection effect from the result of measuring, but it is filmed on the black surface of low reflectance ( Near-infrared reflectance is 0.04) and cement pressure plate (near-infrared reflectance is 0.22) The measured near-infrared reflectance of the same thickness of the coating is 0.14 and 0.18, which is largely close to the low reflectance of the substrate Therefore, it can be seen that the coating has good near-infrared transmittance, thus achieving the high near-infrared reflectance result obtained by using the standard measurement method to form a film on a high-reflectance substrate, but this does not mean that Not a highly reflective coating nor significantly reflective insulation

Method used

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  • Near-infrared reflectance, transmittance and absorptance determination methods of coatings
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  • Near-infrared reflectance, transmittance and absorptance determination methods of coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The aluminum plate and the black surface aluminum plate were taken respectively, and the near-infrared reflectance was measured with an Agilent cary-5000 ultraviolet-visible-near-infrared spectrophotometer. The results are shown in Table 1

[0042] Take the gray coating to be tested and use the above-mentioned aluminum plate and the black surface aluminum plate to make a coating of the same thickness, and prepare a sample with a coating thickness of 50 μm; use an Agilent cary-5000 ultraviolet-visible-near-infrared spectrophotometer to measure the near-infrared reflectance of the sample , the results are shown in Table 1

[0043] Calculate the near-infrared reflectance, transmittance, absorptance and near-infrared contrast ratio of the coating according to the following formulas, and the calculation results are shown in Table 1:

[0044] The calculation formula is:

[0045]

[0046] Rc=R H -Tc×R BH (2)

[0047] Ac=1-Tc-Rc (3)

[0048] X=R L / R H (4)

[0049] f...

Embodiment 2

[0061] Using the same gray paint to be tested as in Example 1, except that the thickness of the prepared sample coating was 100 μm, other testing procedures were the same as in Example 1. The results are shown in Table 2

[0062] Table 2

[0063]

Embodiment 3

[0065] Using the same gray paint to be tested as in Example 1, except that the thickness of the prepared sample coating was 150 μm, other testing procedures were the same as in Example 1. The results are shown in Table 3

[0066] table 3

[0067]

[0068] As can be seen from Examples 1, 2, and 3, the near-infrared reflectance R measured by the coating prepared on a high near-infrared reflective substrate aluminum plate is H are 0.671, 0.620, 0.598 respectively, and the coating near-infrared reflectance R calculated by the present invention C Respectively 0.317, 0.445, 0.510, the result is obviously low, because the present invention deducts the near-infrared factor that passes through the coating, and obtains a relatively reliable near-infrared reflection ability of the coating;

[0069] Combined with the near-infrared transmittance Tc and near-infrared absorptance Ac obtained at the same time, it can be seen that the near-infrared reflectance R of the coating itself incr...

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Abstract

The invention relates to a detecting method for near-infrared reflectivity, transmittance and absorptance of a coating. The specific scheme is as follows: firstly, respectively determining the near-infrared reflectivity of a high near-infrared reflectivity substrate and a low near-infrared reflectivity substrate by using a sunlight reflectivity determining instrument with an integrating sphere; respectively forming films on the two substrates by using painting and then preparing the coating after forming the film; detecting the near-infrared reflectivity of the coating attached to the substrate by using the sunlight reflectivity determining instrument with the integrating sphere; and calculating the near-infrared reflectivity, transmittance, absorptance and near-infrared contrast ratio of the coating according to the formula. The invention provides the method for simply and conveniently calculating the near-infrared reflectivity, transmittance, absorptance and near-infrared contrast ratio of the coating, and the method has an important guiding function for comprehensively evaluating the formula design and energy-saving effect of the reflective insulation coating.

Description

technical field [0001] The invention relates to a method for detecting near-infrared reflectance, transmittance and absorptance of a coating. Background technique [0002] The spectrum of sunlight received on the earth can be divided into three parts: ultraviolet region, visible light region and near-infrared region according to different wavelengths. 4% of the total solar energy received; the visible region (VIS) 380-780nm, accounting for 43% of the total solar energy received by the earth; the near-infrared region (NIR) 780-2500nm, accounting for 10% of the total solar energy received by the earth 53%. Among them, near-infrared rays can cause molecular vibrations and have a strong thermal effect. [0003] Both infrared and visible light are electromagnetic waves, which obey the laws of reflection and refraction, and there are phenomena of interference, diffraction and polarization, as well as absorption and scattering in the medium. Infrared rays and visible light both ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/359G01N21/55G01N21/59
CPCG01N21/359G01N21/55G01N21/59G01N2021/558G01N2201/065
Inventor 谢宏伟廖向阳蒋磊王玲王镇张大伟
Owner JIANGSU TOP FINE NEW RAW MATERIAL CO LTD