Flexible body temperature sensing material and preparation method therefor
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A body temperature sensing and flexible technology, applied in the field of temperature sensing, can solve the problems of skin detachment from data, instability, poor skin adhesion, etc., and achieve the effects of good human compatibility, easy processing, and slow heat dissipation
Inactive Publication Date: 2016-08-17
包磊
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[0005] For wearable body temperature sensing inventions, most of them simply introduce their structure, for example, using polydimethylsiloxane as a flexible packaging substrate to prepare body temperature and ambient temperature measuring device (CN203400136U), heating the body temperature of the drum structure Sensor fabric device (CN203855818U), chest strap body temperature measuring device (CN103315722A), layered composite body temperature measuring temperature sensor (CN102378905A), body temperature measuring device composited with metal sheet and epoxy resin (CN102288315B), etc., finished products of such sensors It can be used to measure body temperature data in the form of a small-volume sheet, but it has poor skin adhesion. If it is used in non-tight clothing, the detachment from the skin will easily cause data instability
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[0032] figure 1 A flow chart of the preparation method of the flexible body temperature sensing material is given, and the preparation method of the flexible body temperature material of the present invention includes the following steps:
[0033] S1. Dissolving the polyvinylidene fluoride polymer in an organic solvent, then adding graphene with a mass ratio of 1: (0.1 to 0.4) to the polyvinylidene fluoride polymer, and mixing until uniformly dispersed to obtain a mixed solution;
[0034] S2. Electrostatically stretching the mixed solution using electrospinning technology, during the stretching process, the organic solvent volatilizes to form a nanofiber mat or film of a dry composite material; or, use a mold to hold the mixed solution, and dry it Until the organic solvent is completely volatilized, a thin block or sheet of the composite material is generated;
[0035] S3. Process the composite material into a thin sheet and place it on a flat substrate; mix the polydimethyls...
Embodiment
[0038] The preparation method of the flexible body temperature sensing material of this embodiment includes the following steps:
[0039] (1) Dissolve polyvinylidene fluoride polymers (molecular weight greater than 5000) in organic solvents, such as acetone, tetrahydrofuran, methyl ethyl acetone, dimethylformamide, dimethyl sulfoxide, N-methylpyrrolidone, etc. One or more solvent mixtures. Place it in a closed environment at about 40°C and stir until the polyvinylidene fluoride is completely dissolved, and then the mass ratio of the polyvinylidene fluoride to the polyvinylidene fluoride is 1: (0.1-0.4) with few or multiple layers of graphene (the particle size is 70nm-200nm, The specific surface area is 150m 2 / g~250m 2 / g) placed in the solution, and continued ultrasonic stirring for 5 to 15 minutes until the solution was uniformly dispersed.
[0040] (2) Among the solvents used above, if a solvent with a low boiling point is used, such as acetone or tetrahydrofuran, the mix...
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Abstract
The invention relates to a flexible body temperature sensing material and a preparation method therefor. The sensing material contains a flaky composite material, at least two flexible conductive fibers and a flexible coating, wherein the at least two flexible conductive fibers are in electrical conduction with the composite material separately, and the external surface of the composite material is coated with the flexible coating; and the composite material is a composite material of polyvinylidene fluoride and graphene. The flexible body temperature sensing material and the preparation method therefor have the following characteristics: (1) the graphene is adopted as a conductive material, so that the sensing material is low in consumption, low in cost, good in conduction effect and high in accuracy; (2) the polyvinylidene fluoride is adopted as a temperature responsive expansion body, so that the positive correlation is accurate, and particularly, the linear precision is more sensitive after carrying out partial irradiation; and (3) a polydimethylsiloxane flexible coating has the characteristics of being relatively easy to process, good compatibility with human bodies, and the like and is large in relative specific heat capacity and low in heat dissipating speed, so that body surface temperature can be more accurately measured; and meanwhile, polydimethylsiloxane is good in air permeability and good in flexibility, so that the improvement on comfort level of wearers and the accuracy of temperature measurement is facilitated.
Description
technical field [0001] The invention relates to the technical field of temperature sensing, in particular to a flexible sensing material for body temperature measurement and a preparation method thereof. Background technique [0002] Temperature sensing materials refer to materials that can sense temperature and its changes and output corresponding signals. It can be divided into two types: thermal resistance type and thermocouple type. The former refers to the measurement of temperature by using the principle that the resistance value of a conductor or semiconductor changes with temperature, and the latter refers to the measurement of temperature by using the principle that the thermoelectromotive force generated between the thermal electrodes changes with temperature. The latter is an active sensor, which is inconvenient for body temperature measurement. [0003] Thermal resistance temperature sensing materials, if the resistance value increases as the temperature rises,...
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