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Effect of Concentration of Thermochromic Ink on Performance of Waterborne Finish Films for the Surface of Cunninghamia Lanceolata - PubMed

  • ️Wed Jan 01 2020

Effect of Concentration of Thermochromic Ink on Performance of Waterborne Finish Films for the Surface of Cunninghamia Lanceolata

Xiaoxing Yan et al. Polymers (Basel). 2020.

Abstract

Using Cunninghamia lanceolata as a substrate, the thermochromic ink was added to the waterborne finish to test the optical properties and mechanical properties of the finish film. The results showed that the discoloration performance of the finish film with 15.0% and 30.0% of the thermochromic ink was better. The gloss of the finish film changes irregularly when the concentration increases. The finish film with a thermochromic ink concentration of 10.0% has the highest gloss, and with a concentration of 30.0% has the lowest gloss. When the thermochromic ink concentration exceeds 15.0%, the impact resistance of the finish film is slightly enhanced. The concentration is not related to the liquid resistance of the finish film. When the thermochromic ink concentration was 0-15.0%, the particle distribution uniform reunion was not much. The discoloration mechanism of discolored finish film can be considered to be as follows. After adding thermochromic ink, when the finish film temperature rises, it fades from red to colorless. When the temperature is lowered, the thermochromic ink changes to its original colour again, and the thermochromic effect is stable and sustainable. On the basis of the above results, when the thermochromic ink concentration is 15.0%, the general performance of the waterborne finish film on the Cunninghamia lanceolata surface is the best. This study provides new prospects in using thermochromic ink for waterborne finish film.

Keywords: film performance; finish film; thermochromic ink.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1

Change of L* value from 18 to 40 °C.

Figure 2
Figure 2

Change of a* value from 18 to 40 °C.

Figure 3
Figure 3

Image of of the finish film with 15.0% thermochromic ink changing with temperature: (A) 20 °C, (B) 32 °C, (C) 34 °C, (D) 36 °C, (E) 40 °C.

Figure 4
Figure 4

Effect of thermochromic ink concentration on colour difference of waterborne finish film from 18 to 40 °C.

Figure 5
Figure 5

Effect of thermochromic ink concentration on colour difference of waterborne finish film from 40 to 18 °C.

Figure 6
Figure 6

SEM image of (A) pure finish film and (B) thermochromic microcapsules. The finish film with different thermochromic ink concentration: (C) 5.0%, (D) 15.0%, and (E) 30.0%.

Figure 7
Figure 7

SEM of finish film with 15.0% thermochromic ink before (A) and after (B) UV aging.

Figure 8
Figure 8

Infrared spectra of Cunninghamia lanceolata, waterborne wood finish, thermochromic microcapsules, finish film with 15.0% thermochromic ink before and after heating.

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