CN114578880B - Energy-saving constant-temperature control box and preparation method thereof - Google Patents

Energy-saving constant-temperature control box and preparation method thereof Download PDF

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CN114578880B
CN114578880B CN202210181786.6A CN202210181786A CN114578880B CN 114578880 B CN114578880 B CN 114578880B CN 202210181786 A CN202210181786 A CN 202210181786A CN 114578880 B CN114578880 B CN 114578880B
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temperature
hydrogel
control box
temperature control
heater
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CN114578880A (en
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王涛
刘龚关
何哲健
袁忠和
孙尉翔
童真
陈欣
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South China University of Technology SCUT
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
    • G05D23/32—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature with provision for adjustment of the effect of the auxiliary heating device, e.g. a function of time
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C08J3/075—Macromolecular gels
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2333/24—Homopolymers or copolymers of amides or imides
    • C08J2333/26—Homopolymers or copolymers of acrylamide or methacrylamide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2401/08—Cellulose derivatives
    • C08J2401/26—Cellulose ethers
    • C08J2401/28—Alkyl ethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/16—Halogen-containing compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25—Greenhouse technology, e.g. cooling systems therefor

Abstract

The invention discloses an energy-saving constant-temperature control box and a preparation method thereof. The constant temperature control box comprises a hydrogel box body, a cold light source arranged outside the hydrogel box body and a temperature control system arranged in the hydrogel box body, wherein the temperature control system comprises a heater, a temperature-light intensity combined sensing device, a relay and a power supply, the temperature-light intensity combined sensing device is opposite to the cold light source, the temperature-light intensity combined sensing device comprises hydrogel and a photoresistor, and the hydrogel in the hydrogel box body and the temperature-light intensity combined sensing device is temperature sensitive hydrogel with transparency changing along with temperature. The hydrogel senses the environmental temperature to change the transparency of the hydrogel, so that the resistance value of the photoresistor is changed to control the on-off of the heater, the diffusion of heat inside the system can be effectively reduced, the heat input of the external environment can be blocked, the energy consumption of heating and cooling equipment is reduced, the environmental temperature is kept in a relatively stable range, and the energy-saving effect is achieved.

Description

Energy-saving constant-temperature control box and preparation method thereof
Technical Field
The invention relates to the field of energy-saving constant-temperature control materials, in particular to an energy-saving constant-temperature control box and a preparation method thereof.
Background
The constant temperature control system has wide application in a plurality of fields such as biological culture, article storage, etc., but the constant temperature control system often uses temperature sensor as the accuse temperature module at present, and the function is comparatively single, and the box generally is glass, metal etc. and does not have the heat preservation performance usually, and the energy consumption is higher, and the box that has the heat preservation performance generally is opaque, and is difficult to observe the environment in the case. On the other hand, the hydrogel soft material has a three-dimensional network structure and abundant water, which makes it soft and tough, thereby being capable of adapting to various curved surfaces or irregular surfaces. And because the water-saving temperature control window contains abundant water, the water-saving temperature control window can absorb a large amount of heat and can be used as a window for energy conservation and temperature control. On the basis, the hydrogel with phase change response to external environment stimulation can spontaneously regulate and control energy input and blocking, and further reduce energy consumption. Under the background of global energy shortage, the application of the hydrogel material in the research of the field of energy conservation and temperature control has great practical value.
Among various reversible phase-transition hydrogels, the temperature-sensitive hydrogel has a phase transition temperature, and can respond to the change of the environmental temperature to change from a fully-transparent energy input state at a certain temperature to a non-transparent energy blocking state at another temperature. The whole response process is directly regulated by the ambient temperature and sunlight, additional energy supply is not needed, and the hydrogel is the most widely researched energy-saving hydrogel. For example, solar Energy Materials and Solar Cells,2021,232,111348 report a hydroxypropyl cellulose-polyacrylamide hydrogel which turns from transparent to white at a temperature higher than 40 ℃ and can block the heat caused by sunlight. However, the energy-saving property of hydrogel materials is currently applied to practical scenes, and most of the energy-saving property is limited by studying the structure and performance of the hydrogel.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an energy-saving constant-temperature control box and a preparation method thereof.
In order to realize the aim of the invention, the invention provides an energy-saving constant temperature control box which comprises a hydrogel box body, a cold light source arranged outside the hydrogel box body and a temperature control system arranged inside the hydrogel box body,
the temperature control system comprises a heater, a temperature-light intensity combined sensing device, a relay and a power supply, wherein the temperature-light intensity combined sensing device is connected with the heater and the relay through leads, and the power supply is connected with the heater and the relay through leads;
the temperature-light intensity combined sensing device is arranged opposite to the cold light source and comprises temperature-sensitive hydrogel and a photoresistor, one side of the temperature-sensitive hydrogel is opposite to the cold light source, and the photoresistor is arranged on the other side of the temperature-sensitive hydrogel;
the hydrogel in the hydrogel box body and the hydrogel in the temperature-light intensity combined sensing device are temperature-sensitive hydrogels with transparency changing along with temperature.
By adopting the control box of the scheme, the hydrogel box body and the temperature-light intensity combined sensing device are both temperature-sensitive color-changing hydrogel, the transparency of the hydrogel is changed by sensing the environmental temperature through the hydrogel, the resistance value of the photoresistor is changed, and the on-off of the heater is controlled.
Further, the hydrogel box body is a box body made of temperature-sensitive hydrogel with transparency changing along with temperature.
Furthermore, temperature-sensitive hydrogel with transparency changing along with temperature is stuck on the inner wall or the outer wall of the hydrogel box body, the inner wall can be the whole inner wall or partial inner wall of the box body, and the outer wall can be the whole outer wall or partial outer wall of the box body.
Furthermore, the combination mode of the hydrogel and the photoresistor in the temperature-light intensity combined sensing device is an attaching mode, namely the photoresistor is attached to one side, back to the cold light source, of the hydrogel.
Furthermore, the combination mode of the hydrogel and the photoresistor in the temperature-light intensity combined sensing device is an embedded type, namely the photoresistor is embedded in the hydrogel.
The preparation method of the energy-saving constant temperature control system comprises the following steps:
(1) Preparing the temperature-sensitive hydrogel with the transparency changing along with the temperature: sequentially adding inorganic salt, hydroxypropyl methyl cellulose, an acrylamide monomer and a cross-linking agent into deionized water, uniformly stirring to obtain a mixed solution, introducing inert gas to remove oxygen in the mixed solution, then adding an initiator, uniformly stirring to obtain a hydrogel reaction solution, injecting the reaction solution into a mold, sealing, and carrying out polymerization reaction to obtain a temperature-sensitive hydrogel with the transparency changing along with the temperature;
(2) Preparation of a hydrogel box: preparing a hydrogel box body by adopting the temperature-sensitive hydrogel with the transparency changing along with the temperature, which is prepared in the step (1); or attaching the temperature-sensitive hydrogel with the transparency changing along with the temperature, which is prepared in the step (1), to the inner wall or the outer wall of the box body to prepare a hydrogel box body;
(3) Preparing a temperature-light intensity combined induction device: attaching a photoresistor to one side of the temperature-sensitive hydrogel with the transparency changing along with the temperature prepared in the step (1), or embedding the photoresistor in the temperature-sensitive hydrogel with the transparency changing along with the temperature prepared in the step (1) to prepare the temperature-light intensity combined sensing device;
(4) Preparation of a temperature control system: electrically connecting the temperature-light intensity combined sensing device obtained in the step (3) with a relay, connecting a heater with a power supply by using the relay, controlling the on-off of the relay through the temperature-light intensity combined sensing device, and further controlling the on-off of the power supply of the heater through the relay;
(5) Preparing an energy-saving constant temperature control system: placing a cold light source outside the hydrogel box body, placing a temperature control system inside the hydrogel box body, wherein the temperature-light intensity combined sensing device is arranged right opposite to the cold light source, so that light emitted by the cold light source passes through hydrogel in the temperature-light intensity combined sensing device and then irradiates the photoresistor.
Further, lithium chloride, sodium chloride and potassium chloride are used as the inorganic salt in the step (1), the acrylamide monomer comprises any one of acrylamide, N-dimethylacrylamide and N, N-diethylacrylamide, the crosslinking agent is N, N' -methylenebisacrylamide, the inert gas adopts any one of nitrogen and argon, and the initiator is potassium persulfate or ammonium persulfate.
Further, the concentration of the inorganic salt relative to the deionized water in the step (1) is 0-0.35 g/mL, the concentration of the hydroxypropyl methylcellulose relative to the deionized water is 0.01-0.10 g/mL, the concentration of the acrylamide monomer relative to the deionized water is 2-5 mol/L, the molar ratio of the cross-linking agent to the acrylamide monomer is 0.1-1.5%, the molar ratio of the initiator to the acrylamide monomer is 0.2-0.5%, and the polymerization reaction is carried out at 60-80 ℃ for 8-24 hours.
Furthermore, the resistance value of the photoresistor as a switch in the step (3) is changed within the range of 3-150 k omega.
Further, in the step (4), the working voltage of a relay of the constant temperature control system is 5-12V direct current, the working voltage of the heater is 125-250V alternating current or 28-30V direct current, and the cold light source is an LED lamp.
Further, the working mode of the energy-saving thermostatic control box comprises the following steps:
(1) When the temperature in the energy-saving constant-temperature control box is low, the hydrogel in the temperature-light intensity combined sensing device is in a transparent state, the resistance value of the photoresistor is small under the irradiation of a cold light source, a relay connected with the photoresistor is in a power-on state, a power supply is connected with the heater, the heater works, and the ambient temperature in the box is increased;
(2) When the temperature in the box rises to a certain degree, hydrogel in the temperature-light intensity combined sensing device is changed into an opaque state, the light intensity received by the photoresistor is weakened, the resistance value is increased, the relay is changed into a power-off state, the connection between the heater and the power supply is cut off, the heater stops heating, and the temperature in the box stops rising;
(3) When the temperature in the oven is reduced to a certain temperature, the hydrogel returns to a transparent state, the resistance value of the photoresistor is reduced, the relay is switched to a power-on state, and the heater is started again to heat the constant temperature oven;
(4) The steps (1) to (3) are carried out repeatedly, so that the temperature in the box is stabilized within a certain temperature range;
(5) When the constant temperature control box is used, hydrogel is changed into an opaque state due to temperature rise, and further in a box body formed by the hydrogel, the transmission of heat inside the system to the environment outside the system is greatly reduced, so that the temperature reduction in the box is slowed down, and the working time of a heater can be reduced; on the other hand, the high temperature of the external environment can cause the phase change of hydrogel in the control box, the transparency is reduced, and the radiation of the external heat to the constant temperature control box is blocked, so that the constant temperature in the system is realized without additional cooling equipment, and the combined action of the two aspects ensures that the constant temperature box achieves the energy-saving effect
Compared with the prior art, the invention at least has the following beneficial effects:
1. the constant temperature control box provided by the invention has the effects of constant temperature and energy conservation. According to the working mechanism of the constant temperature control box, the temperature of the environment in the constant temperature box can be in a stable range, namely, the constant temperature effect is realized; meanwhile, the heater is started at low temperature, namely when the environment temperature is low to a set value and the hydrogel is in a transparent state, the hydrogel becomes opaque after the temperature in the box is increased, the resistance value of the photoresistor is increased, so that the heater stops working, the opaque hydrogel can reduce the outward diffusion of heat in the box, the heat preservation performance in the box is improved, and the service time of the heater is shortened; in addition, when the external temperature is higher, the opaque hydrogel can effectively prevent external radiant heat, so that the temperature in the box is not heated too fast, the cooling effect in the box can be achieved without additionally connecting a refrigerator, and the transparency-temperature cooperative regulation function enables the constant temperature control box to achieve an efficient energy-saving effect.
2. The core temperature-light intensity combined sensing device has the characteristics of adjustable transparency and heat insulation. Compared with a temperature-sensitive resistor, the temperature-sensitive component is transparent and has adjustable transparency, so that the condition in the box can be observed conveniently; compared with the fully transparent glass, the glass has the function of heat insulation, can effectively reduce energy consumption and achieves the effect of energy conservation.
3. The raw materials used in the invention are easy to obtain, the formula is simple, and the preparation is simple. The hydroxypropyl methyl cellulose as the functional component is a derivative of cellulose and has wide source; the inorganic salt for adjusting the phase change condition of the hydrogel is a common salt; acrylamide monomers, cross-linking agents and initiators are common medicines for synthesizing hydrogel. The hydrogel is obtained by direct polymerization through a one-pot method, and is simpler than the traditional hydrogel synthesis.
4. According to the invention, the wide-narrow conversion of the modulation range of the hydrogel material to the photo-thermal can be realized by simply adjusting the concentration of hydroxypropyl methyl cellulose or inorganic salt, and the photo-thermal modulation range changes in the wide-narrow range and is reflected as the depth change of the phase change degree of the hydrogel material, so that the hydrogel material can adapt to the condition of large or small environmental temperature difference, and is simple to operate and remarkable in effect.
5. In the invention, the phase transition temperature range of the hydrogel material is simple and convenient to adjust, and the phase transition temperature range can be realized by simply changing the concentration of the inorganic salt.
6. The hydrogel material has good flexibility, can better adapt to various plane curved surfaces compared with the traditional temperature control window made of hard glass or other materials, has more application scenes and has wider application prospect.
Drawings
Fig. 1 is a schematic structural diagram of an energy-saving thermostatic control cabinet according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a bonded temperature-light intensity combined sensor device according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an embedded temperature-light intensity combined sensor provided in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples. For the hydrogels obtained in the examples, the mold used for synthesis consisted of two glass plates with a gasket sandwiched between them, and the reaction solution was polymerized in the cavity to form a sheet-like hydrogel. The tensile strength and elongation at break of the hydrogels were determined using the methods disclosed in Zhang et al adv.Funct.Mater.2018,28, 1707245. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention.
The invention provides an energy-saving constant temperature control box which comprises a hydrogel box body 1, a cold light source 2 arranged outside the hydrogel box body 1 and a temperature control system arranged inside the hydrogel box body 1, wherein the temperature control system comprises a heater 3, a temperature-light intensity combined sensing device 4, a relay 5 and a power supply 6, the temperature-light intensity combined sensing device 4 is connected with the heater 3 and the relay 5 through leads, and the power supply 6 is connected with the heater 3 and the relay 5 through leads; the temperature-light intensity combined sensing device 4 is arranged opposite to the cold light source 1 and comprises temperature-sensitive hydrogel 8 and a photoresistor 9, one side of the temperature-sensitive hydrogel 8 is opposite to the cold light source 2, and the photoresistor 9 is arranged on the other side of the temperature-sensitive hydrogel 8; the hydrogel in the hydrogel box body 1 and the hydrogel in the temperature-light intensity combined sensing device 4 are temperature-sensitive hydrogels with transparency changing along with temperature.
Wherein, the photoresistor 9 is connected with the heater 3 and the relay 5, and the temperature sensitive hydrogel 8 is connected with the photoresistor 9.
By adopting the constant temperature control box provided by the invention, the transparency of the temperature-sensitive hydrogel 8 in the temperature-light intensity combined sensing device 4 changes along with time, so that the stepless regulation of the material on energy can be realized under the condition of changing the environmental temperature and the sunlight illumination, and the actual requirements can be more conveniently met. The temperature-sensitive hydrogel 8 is combined with the photoresistor 9 and used for controlling the heater, whether the heater works or not is determined by the phase change state of the hydrogel material, the heater works only when the ambient temperature is low to a certain value, and the gel becomes opaque after the temperature rises, so that the external dissipation of internal heat can be reduced, and the constant temperature is realized; when the temperature is high, the opaque hydrogel can block part of external radiant heat on one hand, and on the other hand, the water energy in the opaque hydrogel can absorb a large amount of convection heat and conduction heat, so that the influence of the external heat on a system is reduced, the cooling effect can be achieved without connecting a refrigerator, unnecessary energy consumption is reduced, and the energy-saving effect is realized.
Example 1
Firstly, preparing temperature-sensitive hydrogel with transparency changing along with temperature, sequentially dispersing 0g of sodium chloride, 1g of hydroxypropyl methyl cellulose, 14.2g of acrylamide monomer and 0.03g of N, N' -methylene bisacrylamide into 100g of deionized water subjected to nitrogen deoxygenation at room temperature, stirring to obtain uniform mixed solution, and introducing nitrogen to remove oxygen in the mixed solution; then adding 0.1g of potassium persulfate, uniformly stirring to obtain hydrogel reaction liquid, finally injecting the reaction liquid into a mould, sealing, reacting for 8 hours at 60 ℃, and polymerizing to obtain temperature-sensitive hydrogel; the tensile strength is 50kPa, and the elongation at break is 800%; assembling a hydrogel box body by adopting temperature-sensitive hydrogel; a photoresistor is tightly attached to the surface of one side, back to a cold light source, of the temperature-sensitive hydrogel and combined with the surface to form a temperature-light intensity combined sensing device 4, and the temperature-light intensity combined sensing device 4 is connected with a heater 3 (125V alternating current) and a relay 5 (5V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 20 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is lower than 3k omega, the relay 5 is connected with the load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 24 ℃, the gel turns white and becomes opaque, the resistance value of the photoresistor 9 is higher than 3k omega, the relay 5 cuts off the load circuit, the heater 3 stops working, and the temperature in the constant temperature control box begins to drop; when the temperature in the constant temperature control box is reduced to 20 ℃, the temperature-sensitive hydrogel becomes transparent, the resistance value of the photosensitive resistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the circulation is carried out in such a way, so that the temperature in the constant temperature control box is maintained within the range of 20-24 ℃, and the constant temperature effect is achieved; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel box body can block heat radiation and reduce outward diffusion of heat in the constant temperature box, so that the temperature in the constant temperature control box is reduced, the working time of the heater 3 can be shortened, and the energy-saving effect is achieved.
Example 2
Dispersing 10g of sodium chloride, 5g of hydroxypropyl methyl cellulose, 21.3g of acrylamide monomer and 0.75g of N, N' -methylene bisacrylamide into 100g of deionized water which is deaerated by nitrogen in sequence at room temperature, stirring to obtain uniform mixed solution, and introducing nitrogen to remove oxygen in the mixed solution; then adding 0.38g of potassium persulfate, uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould, sealing, reacting at 60 ℃ for 24 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 100kPa, and the elongation at break was 600%. Assembling a hydrogel box body by adopting temperature-sensitive hydrogel; a photoresistor 9 is tightly attached to the surface of one side, back to a cold light source 2, of a temperature-sensitive hydrogel 8, and is combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (220V alternating current) and a relay 5 (5V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 22 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is lower than 20k omega, the relay 5 is connected with the load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 25 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance value of the photosensitive resistor 9 is higher than 20k omega, the relay 5 disconnects the load circuit, the heater 3 stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 22 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 22-25 ℃ so as to achieve the effect of constant temperature; after the temperature in the thermostatic control box rises, the opaque temperature-sensitive hydrogel box body can block heat radiation and reduce the outward diffusion of heat in the thermostatic control box, so that the temperature in the thermostatic control box is reduced, the working time of the heater 3 is shortened, and the energy-saving effect is achieved.
Example 3
Sequentially dispersing 10g of sodium chloride, 5g of hydroxypropyl methyl cellulose, 35.5g of acrylamide monomer and 0.75g of N, N' -methylene-bisacrylamide into 100g of deionized water which is deaerated by nitrogen at room temperature, stirring to obtain uniform mixed liquid, and introducing nitrogen to remove oxygen in the mixed liquid; then adding 0.25g of potassium persulfate, uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould, sealing, reacting at 60 ℃ for 12 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 150kPa, and the elongation at break was 500%. Assembling a hydrogel box body by adopting temperature-sensitive hydrogel; a photoresistor 9 is tightly attached to the surface of one side, back to a cold light source 2, of a temperature-sensitive hydrogel 8, and is combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (250V alternating current) and a relay 5 (5V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 23 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is lower than 30k omega, the relay 5 is connected with a load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 27 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance value of the photosensitive resistor 9 is higher than 30k omega, the relay 5 disconnects the load circuit, the heater 3 stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 23 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photoresistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the circulation is carried out in such a way, so that the temperature in the constant temperature control box is maintained within the range of 23-27 ℃, and the constant temperature effect is achieved; after the temperature in the thermostatic control box rises, the opaque temperature-sensitive hydrogel box body can block heat radiation and reduce the outward diffusion of heat in the thermostatic control box, so that the temperature in the thermostatic control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 4
Dispersing 10g of sodium chloride, 5g of hydroxypropyl methyl cellulose, 35.5g of acrylamide monomer and 0.9g of N, N' -methylene bisacrylamide into 100g of deionized water which is subjected to nitrogen deoxygenation at room temperature in sequence, stirring to obtain uniform mixed solution, and introducing nitrogen to remove oxygen in the mixed solution; then adding 0.3g of potassium persulfate, uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould, sealing, reacting at 60 ℃ for 24 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 300kPa, and the elongation at break was 300%. Assembling a hydrogel box body by adopting temperature-sensitive hydrogel; a photoresistor 9 is tightly attached to the surface of one side, opposite to the cold light source 2, of the temperature-sensitive hydrogel 8, and is combined with the surface to form a temperature-light intensity combined induction device, and the temperature-light intensity combined induction device is connected with a heater 3 (220V alternating current) and a relay 5 (5V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 30 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor is lower than 100k omega, the relay 5 is connected with a load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 35 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance 9 value of the photoresistor is higher than 100k omega, the relay 5 disconnects the load circuit, the heater 3 stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 30 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photoresistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 30-35 ℃ so as to achieve the effect of constant temperature; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of the heat in the constant temperature system, so that the temperature in the constant temperature control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 5
Sequentially dispersing 10g of sodium chloride, 5g of hydroxypropyl methyl cellulose, 35.5g of acrylamide monomer and 0.09g of N, N' -methylene-bisacrylamide into 100g of deionized water which is deaerated by nitrogen at room temperature, stirring to obtain uniform mixed liquid, and introducing nitrogen to remove oxygen in the mixed liquid; then adding 0.75g of potassium persulfate, uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould, sealing, reacting for 24 hours at 60 ℃, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 220kPa, and the elongation at break was 400%. Assembling the temperature-sensitive hydrogel into a hydrogel box body; a photoresistor 9 is tightly attached to the surface of one side, back to a cold light source 2, of a temperature-sensitive hydrogel 8, and is combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (220V alternating current) and a relay 5 (10V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 23 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance 9 value of the photosensitive resistor is lower than 50k omega, the relay 5 is connected with a load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 27 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance value of the photosensitive resistor 9 is higher than 50k omega, the relay 5 disconnects the load circuit, the heater 3 stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 23 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 23-27 ℃ so as to achieve the effect of constant temperature; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel box body can block heat radiation and reduce the outward diffusion of heat in the constant temperature control box, so that the temperature in the constant temperature control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 6
Dispersing 10g of sodium chloride, 5g of hydroxypropyl methyl cellulose, 35.5g of acrylamide monomer and 0.38g of N, N' -methylene bisacrylamide into 100g of deionized water which is deaerated by nitrogen in sequence at room temperature, stirring to obtain uniform mixed solution, and introducing nitrogen to remove oxygen in the mixed solution; then adding 0.38g of potassium persulfate, uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould, sealing, reacting at 60 ℃ for 12 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 250kPa, and the elongation at break was 350%. Assembling a hydrogel box body by adopting temperature-sensitive hydrogel; a photoresistor 9 is tightly attached to the surface of one side, back to a cold light source 2, of a temperature-sensitive hydrogel 8, and is combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (220V alternating current) and a relay 5 (12V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 27 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is lower than 70k omega, the relay 5 is connected with a load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 30 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance value of the photosensitive resistor 9 is higher than 70k omega, the relay 5 disconnects the load circuit, the heater 3 stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 27 ℃, the temperature-sensitive hydrogel 8 becomes transparent, the resistance value of the photosensitive resistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the circulation is carried out in such a way, so that the temperature in the constant temperature control box is maintained within the range of 27-30 ℃, and the constant temperature effect is achieved; after the temperature in the thermostatic control box rises, the opaque temperature-sensitive hydrogel box body can block heat radiation and reduce the outward diffusion of heat in the thermostatic control box, so that the temperature in the thermostatic control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 7
Sequentially dispersing 10g of sodium chloride, 5g of hydroxypropyl methyl cellulose, 35.5g of acrylamide monomer and 0.38g of N, N' -methylene-bis-acrylamide into 100g of deionized water which is deaerated by nitrogen at room temperature, stirring to obtain uniform mixed liquid, and introducing nitrogen to remove oxygen in the mixed liquid; then adding 0.38g of potassium persulfate, uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mold, sealing, reacting at 70 ℃ for 12 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 200kPa, and the elongation at break was 450%. Assembling a hydrogel box body by adopting temperature-sensitive hydrogel; a photoresistor 9 is tightly attached to the surface of one side, back to a cold light source 2, of a temperature-sensitive hydrogel 8, and is combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (220V alternating current) and a relay 5 (12V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 24 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is lower than 40k omega, the relay 5 is connected with a load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 28 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance value of the photosensitive resistor 9 is higher than 40k omega, the relay 5 disconnects the load circuit, the heater 3 stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 24 ℃, the temperature-sensitive hydrogel 8 becomes transparent, the resistance value of the photosensitive resistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 24-28 ℃ so as to achieve the effect of constant temperature; after the temperature in the thermostatic control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of the heat in the thermostatic control box, so that the temperature in the thermostatic control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 8
Dispersing 10g of sodium chloride, 5g of hydroxypropyl methyl cellulose, 35.5g of acrylamide monomer and 0.45g of N, N' -methylene bisacrylamide into 100g of deionized water which is deaerated by nitrogen in sequence at room temperature, stirring to obtain uniform mixed solution, and introducing nitrogen to remove oxygen in the mixed solution; then adding 0.45g of potassium persulfate, uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould, sealing, reacting at 70 ℃ for 12 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 350kPa, and the elongation at break was 250%. Assembling the temperature-sensitive hydrogel into a hydrogel box body; a photoresistor 9 is tightly attached to the surface of one side, back to a cold light source 2, of a temperature-sensitive hydrogel 8, and is combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (220V alternating current) and a relay 5 (12V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 36 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is lower than 120 kOmega, the relay 5 is connected with a load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 40 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance 9 value of the photoresistor is higher than 120k omega, the relay 5 disconnects the load circuit, the heater 3 stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 36 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 36-40 ℃ so as to achieve the effect of constant temperature; after the temperature in the thermostatic control box rises, the opaque temperature-sensitive hydrogel box body can block heat radiation and reduce the outward diffusion of heat in the thermostatic control box, so that the temperature in the thermostatic control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 9
Dispersing 35g of sodium chloride, 1g of hydroxypropyl methyl cellulose, 35.5g of acrylamide monomer and 0.38g of N, N' -methylene bisacrylamide into 100g of deionized water which is deaerated by nitrogen in sequence at room temperature, stirring to obtain uniform mixed solution, and introducing nitrogen to remove oxygen in the mixed solution; then adding 0.3g of potassium persulfate, uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould, sealing, reacting at 80 ℃ for 12 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 310kPa, and the elongation at break was 300%. Assembling a hydrogel box body by adopting temperature-sensitive hydrogel; a photoresistor 9 is tightly attached to the surface of one side, back to a cold light source 2, of a temperature-sensitive hydrogel 8, and is combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (220V alternating current) and a relay 5 (12V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 33 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is lower than 110k omega, the relay 5 is connected with a load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 37 ℃, the gel turns white and becomes opaque, the resistance value of the photoresistor is higher than 110k omega, the relay disconnects the load circuit, the heater stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 33 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is reduced, the heater starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 33-37 ℃ so as to achieve the effect of constant temperature; after the temperature in the thermostatic control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of the heat in the thermostatic control box, so that the temperature in the thermostatic control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 10
Dispersing 35g of sodium chloride, 10g of hydroxypropyl methyl cellulose, 35.5g of acrylamide monomer and 0.38g of N, N' -methylene bisacrylamide into 100g of deionized water which is deaerated by nitrogen in sequence at room temperature, stirring to obtain uniform mixed solution, and introducing nitrogen to remove oxygen in the mixed solution; then adding 0.4g of potassium persulfate, uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould, sealing, reacting at 60 ℃ for 12 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 250kPa, and the elongation at break was 400%. Assembling the temperature-sensitive hydrogel into a hydrogel box body; a photoresistor 9 is tightly attached to the surface of one side, back to a cold light source 2, of a temperature-sensitive hydrogel 8, and is combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (220V alternating current) and a relay 5 (12V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 27 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is lower than 70k omega, the relay 5 is connected with a load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 30 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance value of the photoresistor is higher than 70k omega, the relay disconnects the load circuit, the heater stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 27 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is reduced, the heater starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the circulation is carried out in such a way, so that the temperature in the constant temperature control box is maintained within the range of 27-30 ℃, and the constant temperature effect is achieved; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of the heat in the constant temperature system, so that the temperature in the constant temperature control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 11
Dispersing 10g of lithium chloride, 5g of hydroxypropyl methylcellulose, 19.8g of N, N-dimethylacrylamide monomer and 0.38g of N, N' -methylenebisacrylamide into 100g of deionized water which is deaerated by nitrogen in sequence at room temperature, stirring to obtain uniform mixed liquid, and introducing nitrogen to remove oxygen in the mixed liquid; then adding 0.34g of ammonium persulfate and uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould, sealing, reacting at 60 ℃ for 12 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 60kPa, and the elongation at break was 780%. Assembling a hydrogel box body by adopting temperature-sensitive hydrogel; a photoresistor 9 is tightly attached to the surface of one side, back to the cold light source 2, of the temperature-sensitive hydrogel 8 and combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (28V direct current) and a relay 5 (5V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 20 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is lower than 10k omega, the relay 5 is connected with a load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 24 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance value of the photoresistor 9 is higher than 10k omega, the relay 5 disconnects the load circuit, the heater 3 stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 20 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 20-24 ℃ so as to achieve the effect of constant temperature; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of heat in the constant temperature control box, so that the temperature in the constant temperature control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 12
Sequentially dispersing 10g of lithium chloride, 5g of hydroxypropyl methyl cellulose, 29.7g of acrylamide monomer and 0.38g of N, N' -methylene-bis-acrylamide into 100g of deionized water which is deaerated by nitrogen at room temperature, stirring to obtain a uniform mixed solution, and introducing nitrogen to remove oxygen in the mixed solution; then adding 0.34g of ammonium persulfate and uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould and sealing, reacting at 70 ℃ for 12 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 150kPa, and the elongation at break was 500%. Assembling a hydrogel box body by adopting temperature-sensitive hydrogel; a photoresistor 9 is tightly attached to the surface of one side, back to a cold light source 2, of a temperature-sensitive hydrogel 8, and is combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (30V direct current) and a relay 5 (5V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 23 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is lower than 30k omega, the relay 5 is connected with a load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 27 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance value of the photosensitive resistor 9 is higher than 30k omega, the relay 5 disconnects the load circuit, the heater 3 stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 23 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the circulation is carried out in such a way, so that the temperature in the constant temperature control box is maintained within the range of 23-27 ℃, and the constant temperature effect is achieved; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of heat in the constant temperature control box, so that the temperature in the constant temperature control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 13
Dispersing 20g of lithium chloride, 5g of hydroxypropyl methyl cellulose, 49.6g of N, N-dimethylacrylamide monomer and 0.38g of N, N' -methylenebisacrylamide into 100g of deionized water which is subjected to nitrogen deoxidization at room temperature in sequence, stirring to obtain a uniform mixed solution, and introducing nitrogen to remove oxygen in the mixed solution; then adding 0.34g of ammonium persulfate and uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould and sealing, reacting at 70 ℃ for 12 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 230kPa, and the elongation at break was 480%. Assembling the temperature-sensitive hydrogel into a hydrogel box body; a photoresistor 9 is tightly attached to the surface of one side, opposite to the cold light source 2, of the temperature-sensitive hydrogel 8, and is combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (direct current at 29V) and a relay 5 (direct current at 5V) to form a temperature control system. When the temperature in the constant temperature control box is lower than 25 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is lower than 60k omega, the relay 5 is connected with a load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 29 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance value of the photosensitive resistor 9 is higher than 60k omega, the relay 5 disconnects the load circuit, the heater stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 25 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 25-29 ℃ so as to achieve the effect of constant temperature; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of heat in the constant temperature control box, so that the temperature in the constant temperature control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 14
Sequentially dispersing 20g of lithium chloride, 5g of hydroxypropyl methyl cellulose, 63.6g of N, N-diethyl acrylamide monomer and 0.38g of N, N' -methylene-bis-acrylamide into 100g of deionized water subjected to nitrogen deoxidization at room temperature, stirring to obtain a uniform mixed solution, and introducing nitrogen to remove oxygen in the mixed solution; then adding 0.34g of ammonium persulfate and uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould and sealing, reacting at 80 ℃ for 12 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 260kPa, and the elongation at break was 420%. Assembling a hydrogel box body by adopting temperature-sensitive hydrogel; a photoresistor 9 is tightly attached to the surface of one side, opposite to the cold light source 2, of the temperature-sensitive hydrogel 8, and is combined with the surface of the side, opposite to the cold light source 2, to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (28V direct current) and a relay 5 (5V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 28 ℃, the temperature-sensitive hydrogel 8 becomes transparent, the resistance value of the photosensitive resistor 9 is lower than 80k omega, the relay 5 is connected with the load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 32 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance value of the photoresistor is higher than 80k omega, the relay disconnects the load circuit, the heater stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 28 ℃, the temperature-sensitive hydrogel 8 becomes transparent, the resistance value of the photosensitive resistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the circulation is carried out in such a way, so that the temperature in the constant temperature control box is maintained within the range of 28-32 ℃, and the constant temperature effect is achieved; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of heat in the constant temperature control box, so that the temperature in the constant temperature control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 15
Dispersing 30g of lithium chloride, 10g of hydroxypropyl methyl cellulose, 63.6g of N, N-diethyl acrylamide monomer and 0.38g of N, N' -methylene bisacrylamide into 100g of deionized water which is subjected to nitrogen deoxidization at room temperature in sequence, stirring to obtain a uniform mixed solution, and introducing nitrogen to remove oxygen in the mixed solution; then adding 0.34g of ammonium persulfate and uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould, sealing, reacting for 24 hours at 80 ℃, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 260kPa, and the elongation at break was 430%. Assembling a hydrogel box body by adopting temperature-sensitive hydrogel; a photoresistor 9 is tightly attached to the surface of one side, opposite to the cold light source 2, of the temperature-sensitive hydrogel 8, and is combined with the surface of the side, opposite to the cold light source 2, to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater 3 (28V direct current) and a relay 5 (5V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 28 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is lower than 80k omega, the relay 5 is connected with a load circuit, the heater 3 works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 32 ℃, the temperature-sensitive hydrogel 8 turns white and becomes opaque, the resistance value of the photosensitive resistor 9 is higher than 80k omega, the relay 5 disconnects the load circuit, the heater 3 stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 28 ℃, the temperature-sensitive hydrogel 8 is transparent, the resistance value of the photosensitive resistor 9 is reduced, the heater 3 starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 28-32 ℃ so as to achieve the effect of constant temperature; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of heat in the constant temperature control box, so that the temperature in the constant temperature control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 16
Dispersing 30g of lithium chloride, 10g of hydroxypropyl methyl cellulose, 63.6g of N, N-diethyl acrylamide monomer and 0.9g of N, N' -methylene bisacrylamide into 100g of deionized water which is subjected to nitrogen deoxygenation at room temperature in sequence, stirring to obtain a uniform mixed solution, and introducing nitrogen to remove oxygen in the mixed solution; then adding 0.4g of ammonium persulfate and uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould and sealing, reacting at 80 ℃ for 24 hours, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 500kPa, and the elongation at break was 200%. Assembling the temperature-sensitive hydrogel into a hydrogel box body; a photoresistor is tightly attached to the surface of one side, back to a cold light source, of the temperature-sensitive hydrogel and combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater (28V direct current) and a relay (5V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 40 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is lower than 150k omega, the relay is connected with the load circuit, the heater works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 44 ℃, the gel turns white and becomes opaque, the resistance value of the photoresistor is higher than 150k omega, the relay disconnects the load circuit, the heater stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 40 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is reduced, the heater starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 40-44 ℃ so as to achieve the effect of constant temperature; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of the heat in the constant temperature system, so that the temperature in the constant temperature control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 17
Dispersing 10g of potassium chloride, 5g of hydroxypropyl methyl cellulose, 50.9g of N, N-diethyl acrylamide monomer and 0.3g of N, N' -methylene bisacrylamide into 100g of deionized water which is subjected to argon oxygen removal at room temperature in sequence, stirring to obtain uniform mixed solution, and introducing argon to remove oxygen in the mixed solution; then adding 0.46g of ammonium persulfate and uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould, sealing, reacting for 8 hours at 70 ℃, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 230kPa, and the elongation at break was 500%. Assembling the temperature-sensitive hydrogel into a hydrogel box body; a photoresistor is tightly attached to the surface of one side, back to a cold light source, of the temperature-sensitive hydrogel and combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater (220V alternating current) and a relay (12V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 25 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is lower than 60k omega, the relay is connected with the load circuit, the heater works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 29 ℃, the gel turns white and becomes opaque, the resistance value of the photoresistor is higher than 60k omega, the relay disconnects the load circuit, the heater stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 25 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is reduced, the heater starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 25-29 ℃ so as to achieve the effect of constant temperature; after the temperature in the thermostatic control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of the heat in the thermostatic system, so that the temperature in the thermostatic control box falls and is slowed down, the working time of a heater is shortened, and the energy-saving effect is achieved.
Example 18
Sequentially dispersing 10g of potassium chloride, 10g of hydroxypropyl methyl cellulose, 50.9g of N, N-diethyl acrylamide monomer and 0.3g of N, N' -methylene bisacrylamide into 100g of deionized water which is introduced with argon for removing oxygen at room temperature, stirring to obtain a uniform mixed solution, and introducing argon for removing oxygen in the mixed solution; then adding 0.46g of ammonium persulfate and uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould and sealing, reacting for 8 hours at 70 ℃, and polymerizing to obtain temperature-sensitive color-changing hydrogel; the tensile strength was 230kPa, and the elongation at break was 510%. Assembling the temperature-sensitive hydrogel into a hydrogel box body; a photoresistor is tightly attached to the surface of one side, back to a cold light source, of the temperature-sensitive hydrogel and combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater (220V alternating current) and a relay (12V direct current) to form a temperature control system. When the temperature in the thermostatic control box is lower than 25 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is lower than 60k omega, the relay is connected with the load circuit, the heater works, and the temperature in the thermostatic control box is increased; when the temperature in the constant temperature control box is higher than 29 ℃, the gel turns white and becomes opaque, the resistance value of the photoresistor is higher than 60k omega, the relay disconnects the load circuit, the heater stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 25 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is reduced, the heater starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 25-29 ℃ so as to achieve the effect of constant temperature; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of the heat in the constant temperature system, so that the temperature in the constant temperature control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 19
Sequentially dispersing 20g of potassium chloride, 10g of hydroxypropyl methyl cellulose, 50.9gN, N-diethyl acrylamide monomer and 0.3g of N, N' -methylene bisacrylamide into 100g of deionized water which is introduced with argon for removing oxygen at room temperature, stirring to obtain a uniform mixed solution, and introducing argon for removing oxygen in the mixed solution; then adding 0.46g of ammonium persulfate and uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould, sealing, reacting for 8 hours at 70 ℃, and polymerizing to obtain the temperature-sensitive color-changing hydrogel; the tensile strength was 230kPa, and the elongation at break was 500%. The outer wall of the box body is pasted with temperature-sensitive color-changing hydrogel to form a hydrogel box body 1; the photoresistor 9 is embedded inside the temperature-sensitive hydrogel 8, the outer side of the temperature-sensitive hydrogel 8 faces the cold light source 2 to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater (220V alternating current) and a relay (12V direct current) to form a temperature control system. When the temperature in the constant temperature control box is lower than 25 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is lower than 80k omega, the relay is connected with the load circuit, the heater works, and the temperature in the constant temperature control box is increased; when the temperature in the constant temperature control box is higher than 28 ℃, the gel turns white and becomes opaque, the resistance value of the photoresistor is higher than 80k omega, the relay disconnects the load circuit, the heater stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 32 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is reduced, the heater starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the circulation is carried out in such a way, so that the temperature in the constant temperature control box is maintained within the range of 28-32 ℃, and the constant temperature effect is achieved; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of the heat in the constant temperature system, so that the temperature in the constant temperature control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
Example 20
Dispersing 30g of potassium chloride, 10g of hydroxypropyl methyl cellulose, 50.9gN, N-diethyl acrylamide monomer and 0.3g of N, N' -methylene bisacrylamide into 100g of deionized water which is introduced with argon for deoxidization at room temperature in sequence, stirring to obtain uniform mixed solution, and introducing argon for removing oxygen in the mixed solution; then adding 0.46g of ammonium persulfate and uniformly stirring to obtain a hydrogel reaction solution, finally injecting the reaction solution into a mould and sealing, reacting for 8 hours at 70 ℃, and polymerizing to obtain temperature-sensitive color-changing hydrogel; the tensile strength was 230kPa, and the elongation at break was 500%. The temperature-sensitive color-changing hydrogel is stuck on the inner wall of the box body to form a hydrogel box body 1; a photoresistor is tightly attached to the surface of one side, back to a cold light source, of the temperature-sensitive hydrogel and combined with the surface to form a temperature-light intensity combined sensing device, and the temperature-light intensity combined sensing device is connected with a heater (220V alternating current) and a relay (12V direct current) to form a temperature control system. When the temperature in the thermostatic control box is lower than 30 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is lower than 100k omega, the relay is connected with the load circuit, the heater works, and the temperature in the thermostatic control box is increased; when the temperature in the constant temperature control box is higher than 35 ℃, the gel turns white and becomes opaque, the resistance value of the photoresistor is higher than 100k omega, the relay disconnects the load circuit, the heater stops working, and the temperature in the constant temperature control box is reduced; when the temperature in the constant temperature control box is reduced to 30 ℃, the temperature-sensitive hydrogel is transparent, the resistance value of the photosensitive resistor is reduced, the heater starts to work again, and the temperature in the constant temperature control box is increased along with the temperature; the above steps are repeated to maintain the temperature in the constant temperature control box within the range of 30-35 ℃ so as to achieve the effect of constant temperature; after the temperature in the constant temperature control box rises, the opaque temperature-sensitive hydrogel can block heat radiation and reduce the outward diffusion of the heat in the constant temperature system, so that the temperature in the constant temperature control box is reduced, the working time of the heater is shortened, and the energy-saving effect is achieved.
In conclusion, the embodiment of the invention introduces the hydroxypropyl methyl cellulose with reversible temperature-sensitive phase change property to obtain the temperature-sensitive hydrogel with the phase change degree gradually deepened along with the temperature change, thereby realizing the stepless regulation of the material on energy under the condition of changing the environmental temperature and the sunlight illumination and more conveniently meeting the actual requirement. Furthermore, the hydrogel material is combined with the photoresistor and used for controlling the heater, the working condition of the heater is determined by the phase change state of the hydrogel material, the heater works when the environmental temperature is low to a certain value, and the gel becomes opaque after the temperature is raised, so that the external dissipation of internal heat can be reduced, and the constant temperature is realized; when the temperature is high, the opaque hydrogel can block part of external radiation heat on one hand, and on the other hand, the water energy in the opaque hydrogel can absorb a large amount of convection heat and conduction heat, so that the influence of the external heat on a system is reduced, the cooling effect can be achieved without connecting a refrigerator, unnecessary energy consumption is reduced, and the energy-saving effect is realized.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An energy-saving constant temperature control box is characterized by comprising a hydrogel box body (1), a cold light source (2) arranged outside the hydrogel box body (1) and a temperature control system arranged inside the hydrogel box body (1),
the temperature control system comprises a heater (3), a temperature-light intensity combined sensing device (4), a relay (5) and a power supply (6), wherein the temperature-light intensity combined sensing device (4) is connected with the heater (3) and the relay (5) through leads, and the power supply (6) is connected with the heater (3) and the relay (5) through leads;
the temperature-light intensity combined sensing device (4) is arranged opposite to the cold light source (2), the temperature-light intensity combined sensing device comprises a temperature-sensitive hydrogel (8) and a photoresistor (9), one side of the temperature-sensitive hydrogel (8) is opposite to the cold light source (2), and the photoresistor (9) is arranged on the other side of the temperature-sensitive hydrogel (8);
the hydrogel in the hydrogel box body (1) and the hydrogel in the temperature-light intensity combined sensing device (4) are temperature-sensitive hydrogels of which the transparency changes along with the temperature.
2. The energy-saving thermostatic control cabinet according to claim 1, characterized in that the hydrogel cabinet (1) is a cabinet made of temperature-sensitive hydrogel with transparency changing with temperature.
3. The energy-saving thermostatic control cabinet according to claim 1, characterized in that the inner wall or outer wall of the hydrogel cabinet (1) is adhered with temperature-sensitive hydrogel with transparency changing with temperature, the inner wall can be the whole inner wall or partial inner wall of the cabinet, and the outer wall can be the whole outer wall or partial outer wall of the cabinet.
4. The energy-saving constant temperature control cabinet according to claim 1, characterized in that the combination of the hydrogel (8) and the photoresistor (9) in the temperature-light intensity combined sensing device (4) is an attached type, that is, the photoresistor (9) is attached to the side of the hydrogel (8) opposite to the cold light source (2).
5. The energy-saving thermostatic control cabinet according to any one of claims 1 to 4, characterized in that the hydrogel (8) and the photoresistor (9) in the temperature-light intensity combined sensing device (4) are embedded, i.e. the photoresistor (9) is embedded in the hydrogel (8).
6. A method for preparing an energy-saving thermostatic control cabinet as claimed in any one of claims 1-5, characterized by comprising the following steps:
(1) Preparing temperature-sensitive hydrogel with transparency changing along with temperature: sequentially adding inorganic salt, hydroxypropyl methyl cellulose, an acrylamide monomer and a cross-linking agent into deionized water, uniformly stirring to obtain a mixed solution, introducing inert gas to remove oxygen in the mixed solution, then adding an initiator, uniformly stirring to obtain a hydrogel reaction solution, injecting the reaction solution into a mold, sealing, and carrying out polymerization reaction to obtain a temperature-sensitive hydrogel with the transparency changing along with the temperature;
(2) Preparation of a hydrogel box: preparing the temperature-sensitive hydrogel with the transparency changing along with the temperature, which is prepared in the step (1), to obtain a hydrogel box body (1); or attaching the temperature-sensitive hydrogel with the transparency changing along with the temperature, which is prepared in the step (1), to the inner wall or the outer wall of the box body to prepare a hydrogel box body (1);
(3) Preparing a temperature-light intensity combined induction device: attaching a photoresistor (9) to one side of the temperature-sensitive hydrogel (8) with the transparency changing along with the temperature prepared in the step (1), or embedding the photoresistor in the temperature-sensitive hydrogel (8) with the transparency changing along with the temperature prepared in the step (1), so as to prepare the temperature-light intensity combined sensing device;
(4) Preparation of a temperature control system: electrically connecting the temperature-light intensity combined sensing device obtained in the step (3) with a relay (5), connecting the heater (3) with a power supply (6) by using the relay (5), controlling the on-off of the relay (5) through the temperature-light intensity combined sensing device, and further controlling the on-off of the power supply (6) of the heater (3) through the relay (5);
(5) Preparing an energy-saving constant temperature control system: placing a cold light source (2) outside the hydrogel box body (1), placing a temperature control system inside the hydrogel box body (1), wherein the temperature-light intensity combined sensing device is arranged at a position opposite to the cold light source, so that light emitted by the cold light source (2) passes through hydrogel (8) in the temperature-light intensity combined sensing device and then irradiates the photoresistor (9).
7. The method for preparing an energy-saving thermostatic control cabinet according to claim 6, characterized in that the inorganic salt in step (1) is lithium chloride, sodium chloride or potassium chloride, and the acrylamide monomer is any one of acrylamide, N-dimethylacrylamide and N, N-diethylacrylamide.
8. The preparation method of the energy-saving thermostatic control box according to claim 6, wherein the concentration of the inorganic salt in the step (1) relative to the deionized water is 0 to 0.35g/mL, the concentration of the hydroxypropyl methylcellulose relative to the deionized water is 0.01 to 0.10g/mL, the concentration of the acrylamide monomer relative to the deionized water is 2 to 5mol/L, the molar ratio of the cross-linking agent to the acrylamide monomer is 0.1 to 1.5%, the molar ratio of the initiator to the acrylamide monomer is 0.2 to 0.5%, and the polymerization reaction is performed at 60 to 80 ℃ for 8 to 24 hours.
9. The preparation method of the energy-saving thermostatic control cabinet according to claim 6, characterized in that the resistance value of the photo-resistor (9) as a switch in the step (3) is varied within a range of 3-150 kOmega.
10. The method for preparing the energy-saving thermostatic control cabinet according to any one of claims 6-9, wherein the relay operating voltage of the thermostatic control system in the step (4) is 5-12V direct current, and the heater operating voltage is 125-250V alternating current or 28-30V direct current.
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