Temperature detection material, temperature detection ink using same, temperature indicator, method for manufacturing temperature detection material, and product management system

1. A temperature indicator comprising a base material and a temperature detection material arranged over the base material,

wherein the temperature detection material includes a leuco dye, a color developer, a color eraser, and a matrix material,

wherein the matrix material is a nonpolar material;

a melting point of the matrix material is higher than a melting point of the temperature-indicating material;

the matrix material has energy δd caused by dipole interaction among molecules estimated by a Hansen solubility parameter and energy δh caused by hydrogen bond among molecules of 3 or less, respectively;

the color eraser has energy δd caused by dipole interaction among molecules estimated by a Hansen solubility parameter and energy δh caused by hydrogen bond among molecules of 1 to 10, respectively;

the matrix material is 1 to 10 parts by weight with respect to the temperature-indicating material of 1 part by weight;

a phase separation structure in which the temperature-indicating material disperses in the matrix material is formed;

the color eraser is a material crystallizing hardly to the extent of forming an amorphous state while cooling naturally from a state of melting at a melting point of the color eraser or higher;

the temperature-indicating material melts and erases the color at an initialization temperature, which is the melting point of the temperature-indicating material, and maintains the colorless state by maintaining the amorphous state when cooled from a molten state above the melting point to a glass transition point and detecting temperature deviation by developing color at a crystallization start temperature higher than the glass transition point.

2. The temperature indicator according to claim 1 , further comprising a transparent base material,

wherein the base material, the temperature detection material, and the transparent base material are stacked in this order.

3. The temperature indicator according to claim 2 ,

wherein the base material or the transparent base material includes a heat-insulating material.

4. The temperature indicator according to claim 2 ,

wherein a thermal conductivity from the base material to the temperature detection material is different from a thermal conductivity from the transparent base material to the temperature detection body.

5. The temperature indicator according to claim 1 ,

wherein the matrix material is in a solid state at an operating temperature of the temperature detection material.

6. The temperature indicator according to claim 1 ,

wherein the matrix material includes only hydrocarbon.

7. The temperature indicator according to claim 6 ,

wherein the matrix material is any one of paraffin wax, microcrystalline wax, polyolefin, and terpene resin.

8. The temperature indicator according to claim 1 ,

wherein the temperature detection material contains the matrix material of 1 to 10 parts by weight with respect to the temperature-indicating material of 1 part by weight.

9. The temperature indicator according to claim 1 ,

wherein the temperature detection material further includes any one of a dye, a pigment, a heat storage capsule, and a conducting agent.

10. The temperature indicator according to claim 1 ,

wherein the base material is a continuous porous material; and

the temperature detection material is impregnated in the continuous porous material.