CN113667459A - Electric heating flexible composite phase change material, preparation method thereof and application of electric heating flexible composite phase change material as thermal therapy product - Google Patents
Electric heating flexible composite phase change material, preparation method thereof and application of electric heating flexible composite phase change material as thermal therapy product Download PDFInfo
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- CN113667459A CN113667459A CN202111017085.0A CN202111017085A CN113667459A CN 113667459 A CN113667459 A CN 113667459A CN 202111017085 A CN202111017085 A CN 202111017085A CN 113667459 A CN113667459 A CN 113667459A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
- C09K5/06—Materials undergoing a change of physical state when used the change of state being from liquid to solid or vice versa
- C09K5/063—Materials absorbing or liberating heat during crystallisation; Heat storage materials
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F7/02—Compresses or poultices for effecting heating or cooling
- A61F7/0241—Apparatus for the preparation of hot packs, hot compresses, cooling pads, e.g. heaters or refrigerators
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F2007/0001—Body part
- A61F2007/0002—Head or parts thereof
- A61F2007/0003—Face
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F2007/0001—Body part
- A61F2007/0018—Trunk or parts thereof
- A61F2007/0023—Waist
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F2007/0001—Body part
- A61F2007/0018—Trunk or parts thereof
- A61F2007/0024—Back
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F2007/0001—Body part
- A61F2007/0029—Arm or parts thereof
- A61F2007/0032—Elbow
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F7/02—Compresses or poultices for effecting heating or cooling
- A61F2007/0292—Compresses or poultices for effecting heating or cooling using latent heat produced or absorbed during phase change of materials, e.g. of super-cooled solutions
Abstract
The invention discloses an electric heating flexible composite phase change material, a preparation method thereof and application of the electric heating flexible composite phase change material as a thermal therapy product. The composite material is a flexible phase change film which can be rapidly heated, the composite material is endowed with electric heating performance by using a conductive material, and a power supply is directly charged for heating, so that the temperature is rapidly raised in a short time; by adding the flexible material, the hardness is greatly reduced at normal temperature; different temperature platforms are possessed by adding different phase-change materials, so that the maximum temperature difference is reduced, and the temperature uniformity is good. The material can be used for thermal therapy to act on face, elbow, waist, knee, etc., and has the effects of rapid heating, comfortable wearing, uniform temperature, etc. The material can use domestic power or commercial precious direct charging heating that charges, rapid heating up in the short time, has good flexibility at normal atmospheric temperature simultaneously, improves and dresses the travelling comfort, and the temperature controllability is strong, and temperature uniformity is good, possess portable high-efficient, economic environmental protection, advantages such as the material selection wide range, provide new treatment instrument for the medical field.
Description
Technical Field
The invention designs an electric heating flexible composite phase change material and a thermotherapy product, in particular to a novel heating film which has good flexibility at normal temperature and provides a stable temperature platform through electric heating and a product prepared by the novel heating film.
Background
As a constant temperature animal, human beings have more obvious influence on life activities due to comfortable temperature. Therefore, the thermotherapy means can be used for controlling the temperature of the surrounding environment of the living body, so that certain prevention or treatment effects are exerted, and particularly for temperature-sensitive diseases such as cardiovascular diseases, respiratory diseases and rheumatic joint diseases, the condition of the disease is aggravated when the temperature is too low, so that troubles are caused to patients. Can be used for relieving symptoms by reasonably regulating temperature, reducing anaphylaxis, and relieving various diseases such as sneeze, nasal obstruction, and soreness of shoulder, neck and elbow of allergic rhinitis. The thermotherapy has the advantages of mild treatment, no stimulation or side effect, simple and convenient operation and the like, and is an optimal treatment means.
According to the principle of thermal therapy, there are divided into a magnetic electrotherapy, a radiation thermotherapy and a conduction thermotherapy. The magnetic resonance therapy is to release a magnetic field in the vicinity of a diseased part, so that a patient can absorb the energy of the electromagnetic field and change the energy into heat energy, the requirement on instruments and equipment is high, a special medical institution is required for diagnosis and treatment during treatment, the operation is inconvenient, the cost is high, and a large economic burden is brought to the patient. The far infrared thermotherapy is inconvenient to carry and needs to be powered on all the time. Therefore, it is most convenient and economical for the patient to use conduction thermotherapy, i.e. heat conduction through an object above body temperature, to achieve a thermotherapy effect. The thermotherapy can also be divided into a dry heating method and a wet heating method, wherein the dry heating method adopts a hot water bag, an infrared electric oven and the like for external hot compress, and the wet heating method utilizes water bath or medicine for fumigation by water to relieve discomfort of an affected part.
At present, portable products for hot compress appear on the market, and the products are mainly divided into disposable heat-releasing hot compress and functional products using resistance wires to release heat. The disposable product has the disadvantages of being not economic and environment-friendly enough and uncontrollable in hot compress temperature, and the resistance wire heating product has the disadvantages of low heating speed, overhigh local temperature, need of being electrified and heated all the time, and the like.
Many scientists have searched and tried to explore new thermal therapeutic tools, and CN113017977A discloses a new thermal therapeutic machine, but the apparatus is heavy, cumbersome to operate and inconvenient to carry. CN112998938A discloses a gynecological hot compress bag, but the material self-heating speed is slow, and the bag is a disposable product, which is not environment-friendly, and CN104644321A discloses a thermal therapy mask, the material is filled with phase-change material, but the defects of tedious heating, slow speed and the like still exist. CN113015275A discloses an electric heating film, which uses a conductive heating strip to realize rapid heating, but the wearing comfort of the material is low, and the wearing requirements of human body cannot be met.
The above treatment method brings inconvenience to patients, so that it is of great significance to develop a thermal therapy means with rapid heating, convenient carrying and high comfort.
Disclosure of Invention
The invention aims to provide an electrothermal flexible composite phase change material for thermal therapy and a preparation method thereof, which overcome the defects of uneven temperature, poor comfort level, low heating rate and the like.
In order to achieve the purpose, the invention adopts the technical scheme that:
an electric heating flexible composite phase change material is a flexible phase change film capable of being heated rapidly, an electric conductive material is used for endowing the composite material with electric heating performance, a power supply is charged directly for heating, the temperature is raised rapidly in a short time, and the heating rate is increased by 3 times compared with that of hot air heating; by adding a certain mass fraction of flexible material, the hardness is greatly reduced at normal temperature; different phase-change materials are added to have different temperature platforms, so that the maximum temperature difference is reduced, and the temperature uniformity is good; .
Further, the power supply comprises a household power supply or a USB charger.
Further, the electrothermal flexible composite phase change material comprises the following components: 50-88% of phase-change material, 2-25% of expanded graphite, 10-30% of polystyrene-polyethylene-polybutylene-polystyrene block copolymer (SEBS) and 0-15% of flexible material.
Furthermore, the thermal conductivity of the composite phase change material is 0.8-3.8W/(m.K), the electrical conductivity is 1-1030S/m, the hardness at normal temperature (25 ℃) is 40-68 HA, the hardness is reduced to 0HA after the phase change temperature is exceeded, and the thickness of the material is 1-20 mm.
Further, the phase change material includes straight chain paraffin, paraffin mixture and commercial paraffin, polyol and fatty acid industrial products.
Further, the phase-change material is a material with a phase-change temperature of 40-60 ℃.
Further, the flexible material is silicone oil which is liquid at normal temperature, an organic oily material which is liquid at normal temperature, paraffin with lower phase transition temperature, polyhydric alcohol or fatty acid; the silicone oil which is liquid at normal temperature comprises methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen-containing silicone oil, methyl phenyl silicone oil, methyl chlorphenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropyl silicone oil, methyl vinyl silicone oil, methyl hydroxyl silicone oil, ethyl hydrogen-containing silicone oil, hydroxyl hydrogen-containing silicone oil or cyanogen-containing silicone oil; the organic oily material which is liquid at normal temperature comprises alkane with the carbon number less than eighteen.
A preparation method of an electric heating flexible composite phase change material comprises the following steps: preheating the components, and weighing the materials; filling the pretreated expanded graphite into a beaker, adding other components according to the proportion, physically stirring, transferring to a wall breaking machine, and dispersing for 5-40 s to obtain uniform powder; transferring to a beaker, putting into an oil bath pan, and stirring; and weighing the prepared material, putting the weighed material into a mold, and transferring the mold to a flat vulcanizing machine for shaping to obtain the electric heating flexible composite phase change material.
The method comprises the following specific steps:
1) preheating a raw material phase-change material, namely SEBS (styrene-ethylene-butadiene-styrene) at 80 ℃ to ensure that a liquid phase-change material is obtained, and removing moisture in the SEBS material;
2) weighing the materials according to the proportion, wherein the materials comprise the following components: 50-88% of phase-change material, 2-25% of expanded graphite, 10-30% of polystyrene-polyethylene-polybutylene-polystyrene block copolymer (SEBS) and 0-15% of flexible material.
3) And (3) filling the pretreated expanded graphite into a beaker, adding the phase-change material, the flexible material and the SEBS according to the proportion, physically stirring, transferring to a wall breaking machine, and dispersing for 15-40 s to obtain uniform powder.
4) The powder was transferred to a beaker and transferred to an oil bath and stirred.
5) And weighing the prepared material, putting the weighed material into a mold, and transferring the mold to a flat vulcanizing machine for shaping to obtain the electric heating flexible composite phase change material.
And the expanded graphite pretreatment operation is drying at 120 ℃ for 12-24 h.
The shaping process comprises the steps of preheating for 2min at 125 ℃ by using a shaping mold, and hot-pressing for 10-30min in a flat vulcanizing machine under the pressure of 5-14 Mpa.
The phase change material and the flexible material are preferably materials with the same group, and have better compatibility according to the principle of similarity and intermiscibility.
The utility model provides an application of electric heat flexible composite phase change material, will make composite material both ends use conductive adhesive to paste two sets of electrode slices through the conductive adhesive, as attached 2, pass through direct connections circular telegram such as transformer or commercial precious USB mouth that charges with domestic circuit, fixed current: 0-5A, voltage: 5 ~ 220V, the accessible is parallelly connected polylith composite phase change material in series and is obtained more high-power, pastes and applies face, elbow, waist, back electricity heating realization thermotherapy function.
In the application, the thermal therapy product is a thermal therapy means which takes the obtained composite material as a heating film or is filled in a thermal application and acts on the face, the waist, the elbow, the back and the like in medical treatment, and a portable, efficient, economic and environment-friendly thermal therapy tool with wide material selection range is provided for thermal therapy.
The specific steps for preparing the thermotherapy product are as follows:
1) and respectively adhering electrode plates to the upper end and the lower end of the shaped composite phase change material prepared by the steps, connecting a lead, and connecting a circuit by using a commercial electric plug through a transformer or directly connecting a commercial USB interface to form an electric heating circuit.
2) The composite material can adjust the size and the proportion according to the acting part to meet the requirements of thermal therapy, and the cotton woven cloth plays a role in protecting and insulating heat, so that the material effect is safer and more effective.
3) The thermotherapy product prepared by sewing can be added with a timing button according to the setting of an external circuit to control the thermotherapy time; meanwhile, the heating current can be controlled through the temperature sensor so as to control the heating temperature and the heating speed.
Compared with the prior art, the invention has the following advantages:
1) the key performance is increased, namely, the electric conduction and heating are realized, and the added carbon-based material has excellent electric conduction performance, so that the heating rate of the electric heating is improved by about 3 times compared with that of hot air or hot water, and the heating time is greatly shortened;
2) the addition of the flexible material breaks through the limitations of poor flexibility, poor comfort and the like of the traditional composite phase change material at normal temperature, and the hardness is reduced by about 10-20% at normal temperature;
3) compared with the traditional hot application, the temperature uniformity is greatly improved;
4) the composite phase change material prepared by the method provided by the invention has the advantages of excellent electric-heat conversion performance, good circulation stability, simple preparation process and low cost, and is suitable for large-scale production.
The invention aims to prepare an economical and practical thermotherapy product, wherein expanded graphite and SEBS are selected as an adsorption material and a flexible matrix, a flexible additive is added by utilizing the phase change performance of a phase change material, so that a composite phase change material with flexibility, conductivity and high heat conductivity is prepared, the phase change temperature range of the composite phase change material is suitable for the thermotherapy temperature, and the prepared composite phase change material has the characteristics of softness, environmental protection, economy, portability, easiness in heating and the like, can be manufactured into a hot-compress patch by a textile technology or directly used as a filler of a thermotherapy material component, and is finally applied to the thermotherapy industry.
Drawings
FIG. 1 is a DSC spectrum of the composite material obtained in example 1 of the present invention.
FIG. 2 is a schematic diagram of an electrical heating model for the composite material of embodiment 1 of the present invention.
Wherein, the mask body and the tightening belt are provided; secondly, the electrode plates are pasted on the upper surface and the lower surface; and the third is electric heating flexible composite phase change material.
The specific implementation mode is as follows:
the following describes the object of the present invention in further detail with reference to the drawings and specific examples, which are not repeated herein, but the embodiments of the present invention are not limited to the following examples.
Example 1
(1) Preparation of composite phase-change material
10g of expanded graphite (pretreatment) and 70g of paraffin (phase transition temperature 44 ℃), 5g of simethicone and 15g of SEBS are weighed.
In order to better improve the effective adsorption rate of the phase-change material and the silicone oil, the paraffin is added into the expanded graphite, the silicone oil and the SEBS are added after being uniformly stirred, and the mixture is transferred to a wall breaking machine for crushing for 20s after being stirred.
And transferring the obtained uniform powder into an oil bath pan, wherein the SEBS long chain part in the material is opened at the moment to form an adsorption network together with the expanded graphite, and paraffin and silicone oil are filled in the adsorption network, and the filling of the silicone oil in a normal-temperature liquid state enables the paraffin to still have a moving space even if being adsorbed in the network at normal temperature, so that the paraffin has normal-temperature flexibility.
Preheating the prepared powder for 2min at 125 ℃ through a die, and then shaping for 12min to obtain the composite material block.
(2) Composite material applications
The present embodiment takes the electric heating of the thermal therapy mask as an example, and the working performance of the present invention is explained as follows.
Filling the obtained composite phase change material block into the middle of a double-layer mask, and attaching upper and lower copper sheets with the thickness of 0.2mm to two ends of the composite material block as shown in figure 2.
The composite phase change material is electrically heated by using an electric heating instrument and setting the constant current to be 2.1A (commercial charger output current), the heating and heat release time of the material is determined through one-time electric heating test, the heating can be carried out for only 5min, and the heat release energy can be maintained for more than 1 h. Meanwhile, ten-cycle tests verify that the thermal stability of the material is good. Therefore, the flexible composite material can meet the requirements of thermal therapy.
Example 2
(1) Preparation of composite phase-change material
Other technical features in the embodiment are the same as those in embodiment 1 except that the following different technical features are different:
the weight of the expanded graphite is 2g, the weight of the paraffin is 88g, and the weight of SEBS is 10 g.
(2) Composite material applications
The prepared composite material block can be used as a rapid heating film to be coated in a hot water bag material to drive the rapid heating of the hot water bag.
Example 3
(1) Preparation of composite phase-change material
Other technical features in the embodiment are the same as those in embodiment 1 except that the following different technical features are different:
the content of the expanded graphite is 25g, the content of the paraffin is 50g, the content of the silicone oil is 15g, and the content of the SEBS is 10 g.
(2) Composite material applications
The prepared composite material block is strong in electrical conductivity, good in thermal conductivity and good in flexibility, can be used as an outer heat-conducting film of a thermal therapy product, is attached to a human body through an insulating film, is in contact with the human body, and provides better comfort, so that the wearing comfort of the thermal therapy product is improved.
Example 4
(1) Preparation of composite phase-change material
Other technical features in the embodiment are the same as those in embodiment 1 except that the following different technical features are different:
the phase-change material is composed of polyethylene glycol with a phase-change temperature of 40-60 ℃.
The flexible material is composed of methyl hydroxyl silicone oil.
(2) Composite material applications
In this embodiment, the application of the material of the present invention as an electric heating film is described below by taking a Chinese medicine application as an example.
After being connected the back with the wire with combined material design and applying in traditional chinese medicine package, connect the power, use domestic power to heat, combined material is under the circular telegram, and the resistance of heat conduction material generates heat to phase change material in the heating material makes the bulk temperature of material promote, simultaneously because phase change material takes place the phase transition, turns into liquid from solid-state, and the material flexibility increases, can regard as heating film and traditional chinese medicine package to ally oneself with, applies as hot application and acts on the affected part. After the power supply is cut off, the material melts and accumulates a large amount of latent heat of phase change after heating, takes place heat conduction in the air convection, and the heat that produces supplyes the heat in the hot compress patch and loses for steady temperature platform appears in the material, and the maximum difference in temperature is about 3 ℃ in the heating process, and the maximum difference in temperature of the heating position of commercial thermotherapy gauze mask that does not add phase change material and other positions surpasss 30 ℃ and constantly rises, causes the damage to human skin easily. It can be seen that the temperature uniformity of the material is far superior to commercial masks.
Example 5
(1) Preparation of composite phase-change material
In this embodiment, other technical features are the same as those in embodiment 1 except that the following different technical features are different:
the phase-change material is composed of a binary mixture of eicosane and docosane with the phase-change temperature of 40-60 ℃.
The flexible material is composed of tetradecane.
(2) Composite material applications
The present embodiment takes a thermotherapy belt as an example, and the following description is made of the application of the material of the present invention as an electric heating film.
The composite material is prepared into a plurality of composite phase change material blocks with the diameter of 15 multiplied by 7.5mm, the materials are mutually connected through electrode plates and leads to form a heating module, a thermotherapy waistband is sewn through an upper layer of cotton woven fabric and a lower layer of cotton woven fabric, a time control circuit and a temperature sensor are configured, and the thermotherapy time and the thermotherapy temperature are controlled through the control circuit and the sensor.
Through tests, the material heated by hot air has the heating rate of about 2.08 ℃/min and the heating rate of 5.80 ℃/min, and the heating rate is increased by nearly 3 times compared with the heating rate of hot air when the material is heated. Meanwhile, for thirty grams of materials, the material can reach the phase transition temperature only in 3 minutes and 30 seconds, so that the timeliness is greatly improved, the material can be used after being charged, and is more portable.
Example 6
(1) Preparation of composite phase-change material
In this embodiment, other technical features are the same as those in embodiment 1 except that the following different technical features are different:
the phase change material consists of fatty acid with the phase change temperature of 40-60 ℃.
The flexible material is composed of vegetable oil.
(2) Composite material applications
The present embodiment takes thermotherapy knee pad as an example, and the application of the material of the present invention as an electric heating film is explained below.
The composite material is prepared into a film-shaped composite phase change material through a mould, a plurality of films are connected with a plurality of leads through electrode plates and are connected with a control circuit, after the upper surface and the lower surface of the film-shaped composite phase change material are covered with cotton woven cloth, magic tapes are sewn at two ends of the film-shaped composite phase change material to form the thermal therapy kneepad.
When the kneepad is used, the power interface is connected with the USB and then powered on, after the kneepad reaches a set temperature, the position and the wearing state are adjusted through the magic tape, and feet are straightened to carry out hot compress. When carrying out outdoor activities winter simultaneously, can pull out the power as outdoor protective apparatus after heating the knee-pad in advance, if be in for a long time in the open air, can use commercial treasured that charges to charge once more.
Example 7
(1) Preparation of composite phase-change material
In this embodiment, other technical features are the same as those in embodiment 1 except that the following different technical features are different:
the phase-change material is composed of methyl stearate with the phase-change temperature of 40-60 ℃.
The flexible material is composed of vegetable oil.
(2) Composite material applications
The present embodiment takes an electric blanket as an example, and the following description is made of the application of the material of the present invention as an electric heating film.
The prepared composite material is injected into the central layer of the electric blanket, the existence of the phase-change material provides a uniform and stable temperature platform for the electric blanket, and meanwhile, the latent heat value of the material can reduce energy consumption. The electric heating flexible composite phase change material is added into the electric blanket, so that comfortable temperature of a human body can be provided in a cold environment in winter, and meanwhile, the low current requirement of the material and heat energy supply are more green and environment-friendly.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The electric heating flexible composite phase change material is characterized in that the composite material is a flexible phase change film capable of being heated rapidly, the composite material is endowed with electric heating performance by using a conductive material, a power supply is directly charged for heating, the temperature is rapidly raised in a short time, and the heating rate is increased by 3 times compared with that of hot air heating; by adding the flexible material, the hardness is greatly reduced at normal temperature; different temperature platforms are possessed by adding different phase-change materials, so that the maximum temperature difference is reduced, and the temperature uniformity is good.
2. The electrothermal flexible composite phase change material according to claim 1, wherein the power supply comprises a household power supply or a charger USB.
3. The electrothermal flexible composite phase change material of claim 1, wherein the electrothermal flexible composite phase change material composition comprises: 50-88% of phase-change material, 2-25% of expanded graphite, 10-30% of polystyrene-polyethylene-polybutylene-polystyrene block copolymer (SEBS) and 0-15% of flexible material.
4. The electrothermal flexible composite phase change material as claimed in claim 1, wherein the composite phase change material HAs a thermal conductivity of 0.8-3.8W/(m-K), an electrical conductivity of 1-1030S/m, a normal temperature (25 ℃) hardness of 40-68 HA, a hardness drop of 0HA after exceeding a phase change temperature, and a material thickness of 1-20 mm.
5. The electrothermal flexible composite phase-change material according to claim 1 or 3, wherein the phase-change material comprises linear paraffin, paraffin mixture, paraffin, polyol and fatty acid industrial products.
6. The electrothermal flexible composite phase change material according to claim 1 or 3, wherein the phase change material has a phase change temperature of 40-60 ℃.
7. The electrothermal flexible composite phase change material according to claim 1 or 3, wherein the flexible material is silicone oil that is liquid at normal temperature, an organic oily material that is liquid at normal temperature, paraffin with a lower phase change temperature, polyhydric alcohol, or fatty acid; the silicone oil which is liquid at normal temperature comprises methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen-containing silicone oil, methyl phenyl silicone oil, methyl chlorphenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropyl silicone oil, methyl vinyl silicone oil, methyl hydroxyl silicone oil, ethyl hydrogen-containing silicone oil, hydroxyl hydrogen-containing silicone oil or cyanogen-containing silicone oil; the organic oily material which is liquid at normal temperature comprises alkane with the carbon number less than eighteen.
8. The preparation method of the electrothermal flexible composite phase-change material as claimed in any one of claims 1 to 7, characterized in that:
preheating the components, and weighing the materials; filling the pretreated expanded graphite into a beaker, adding other components according to the proportion, physically stirring, transferring to a wall breaking machine, and dispersing for 5-40 s to obtain uniform powder; transferring to a beaker, putting into an oil bath pan, and stirring; and weighing the prepared material, putting the weighed material into a mold, and transferring the mold to a flat vulcanizing machine for shaping to obtain the electric heating flexible composite phase change material.
9. The application of the electrothermal flexible composite phase-change material as claimed in any one of claims 1 to 8, is characterized in that: will make composite material both ends use conductive adhesive to paste two sets of electrode slices through the conductive adhesive, pass through transformer or precious USB mouth lug connection circular telegram that charges with domestic circuit, stationary current: 0-5A, voltage: 5 ~ 220V, obtain more high-power through parallelly connected polylith composite phase change material of establishing ties, paste and apply in face, elbow, waist, back electricity heat realization thermotherapy function.
10. The use of the electrothermal flexible composite phase change material as claimed in claim 1, wherein the thermotherapy product is a thermotherapy means for applying the composite material obtained as a heating film or filled in a hot compress to the face, waist, elbow, or back in medical treatment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111017085.0A CN113667459A (en) | 2021-08-31 | 2021-08-31 | Electric heating flexible composite phase change material, preparation method thereof and application of electric heating flexible composite phase change material as thermal therapy product |
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| CN202111017085.0A CN113667459A (en) | 2021-08-31 | 2021-08-31 | Electric heating flexible composite phase change material, preparation method thereof and application of electric heating flexible composite phase change material as thermal therapy product |
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