Thermoresponsive material, method for producing thermoresponsive material, and heat control device
AssigneeToyo Tire & Rubber Co., Ltd.
InventorSeiji Iseki
Life of this patent
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Abstract
Provided is a thermoresponsive material containing bubbles and has improved durability. A thermoresponsive material 1 whose state changes, depending on a change in temperature, comprises a matrix 2 in which bubbles 4 having an average diameter of 30 to 400 μm are dispersed. Satisfied is D/a≤0.7, where D represents the standard deviation of diameters of the bubbles 4, and a represents the average diameter of the bubbles 4. Satisfied is 0.3≤V1/V2≤0.9, where V1 represents the volume of the bubbles 4 at room temperature, and V2 represents the apparent volume of the matrix 2 at room temperature. The matrix 2 contains a liquid crystalline polyurethane.
Claims19
1-10. (canceled)
A thermoresponsive material whose state changes, depending on a change in temperature, comprising:
- a matrix in which bubbles having an average diameter of 30 to 400 μm are dispersed.
A method for producing a thermoresponsive material whose state changes, depending on a change in temperature, the method comprising:
- a bubble generation step of adding a pyrolytic blowing agent to a liquid crystalline polyol that has or has not been melted by heating, the weight ratio of the pyrolytic blowing agent to the liquid crystalline polyol being 0.02 to 0.20 times, and adding an isocyanate compound to the liquid crystalline polyol that has been melted by heating, the weight ratio of the isocyanate compound to the liquid crystalline polyol being 0.15 to 0.45 times, to generate bubbles in the melt of the liquid crystalline polyol;
- and
- a cooling step of cooling the melt containing the bubbles to form a liquid crystalline polyurethane.
Dependencies are inferred from the claim text.