CN115947982B - Aloe cold-storage heat-conduction elastomer and preparation method and application thereof - Google Patents
Aloe cold-storage heat-conduction elastomer and preparation method and application thereof Download PDFInfo
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Abstract
The application relates to the field of cold accumulation heat conduction materials, and particularly discloses an aloe cold accumulation heat conduction elastomer and a preparation method and application thereof. The aloe cold-storage heat-conduction elastomer comprises the following raw materials in parts by weight: 60-90 parts of aloe elastomer, 10-20 parts of phase modification and 5-8 parts of nitride, nitride coating phase modification, and are embedded in the aloe elastomer; the melting point of the phase variant is 40-55 ℃; the aloe elastomer is prepared from aloe; the phase change body is prepared from 50-70 parts of sodium sulfate decahydrate, 50-70 parts of sodium hydrogen phosphate dodecahydrate and 3-6 parts of short-chain naphthenic acid modified cyclopropylamide; the aloe cold-storage heat-conducting elastomer can be applied to mattresses, eyepatches, pillows, back cushions, insoles and the like. The aloe cold-storage heat-conducting elastomer has the effect of higher comfort level for human body when conducting heat for the human body.
Description
Technical Field
The application relates to the field of cold accumulation heat conduction materials, in particular to an aloe cold accumulation heat conduction elastomer, a preparation method and application thereof.
Background
The mattress is an essential sleeping article in daily life and seriously affects the sleeping quality of people; especially in summer, it is very important to have a mattress capable of accumulating cold and heat for sleeping comfort.
In the related art, the traditional bamboo mat has a heat conduction coefficient of 0.16w/km and cannot conduct heat effectively; the heat conductivity coefficient of the ice pad is 2.2w/km, the super heat conduction causes the nerve of the human body to be disordered, and the long-term use affects the health of the human body; the latex is used as a main material for manufacturing mattresses frequently, the heat conductivity coefficient is 0.047w/km, which is far lower than that of a human body, and the human body is in long-time contact, so that heat accumulation is easy to generate; and the latex is too soft, so that the mattress is used for a long time and the skeleton structure of a human body is easy to change.
Aloe has a conductor coefficient close to that of a human body, and Chinese patent CN113802374A discloses a moisturizing and antibacterial health-preserving mattress containing aloe extract, and weaving and forming textile threads soaked in aloe extract soaking liquid to obtain the moisturizing and antibacterial health-preserving mattress containing aloe extract; chinese patent CN109233010a discloses a high-elastic non-allergic antibacterial latex for mattresses, which is prepared from the following raw materials in parts by weight: 50-80 parts of dandelion extract, 50-100 parts of silver chrysanthemum glue, 10-20 parts of aloe glue, 2-5 parts of tea dreg extract, 20-30 parts of gutta-percha, 5-10 parts of tapioca, 1-3 parts of cactus extract, 0.5-1 part of terpene resin, 1-2 parts of rosin ester, 1-2 parts of casein and 3-10 parts of starch. The aloe mattress is respectively prepared by soaking aloe extract into a woven thread and spinning and adding a small amount of aloe gel, and the small amount of aloe can not exert the effective heat conduction of aloe, so that the aloe mattress can not conduct heat conduction for a long time and comfort to a human body, and can not provide a good sleeping environment for the human body.
Disclosure of Invention
In order to provide a cold-storage heat-conducting material suitable for long-term contact of human bodies, the application provides an aloe cold-storage heat-conducting elastomer and a preparation method and application thereof.
In a first aspect, the application provides an aloe cold-storage heat-conduction elastomer, which adopts the following technical scheme:
an aloe cold-storage heat-conduction elastomer comprises the following raw materials in parts by weight: 60-90 parts of aloe elastomer, 10-20 parts of phase modification and 5-8 parts of nitride, nitride coating phase modification, and are embedded in the aloe elastomer; the melting point of the phase variant is 40-55 ℃;
the aloe elastomer is prepared from aloe;
the phase change body is prepared from 50-70 parts of sodium sulfate decahydrate, 50-70 parts of sodium hydrogen phosphate dodecahydrate and 3-6 parts of short-chain naphthenic acid modified cyclopropylamide; the parts by weight are based on the phase change material.
By adopting the technical scheme, the human body heat conductivity coefficient estimated by the blood heat conductivity coefficient and the muscle heat conductivity coefficient is 0.46w/km, and the aloe cold-storage heat-conducting elastomer taking aloe as a main body is 0.479w/km, so that the heat conductivity coefficient is slightly higher than the heat conductivity coefficient of the human body, and the comfort level of the human body is higher when the heat is conducted to the human body. The body temperature of the human body is 37 ℃, the surface temperature of the human body is 33 ℃, and when the human body is in a static state, the environment temperature exceeds the surface temperature of the human body, so that the human body can sweat; if the human body contacts with the elastic body without heat conduction effect, the temperature can exceed 33 ℃ under the conduction of the body temperature of the human body, and the human body can sweat; when the ambient temperature is 30 ℃, the temperature of the aloe cold-storage heat-conduction elastomer is about 28.5 ℃, a small temperature difference of 4.5 ℃ is formed between the aloe cold-storage heat-conduction elastomer and the surface temperature of a human body, and cold-heat molecules meet to generate exchange cooling; and the human body feels more comfortable.
The phase change body can absorb heat at high temperature and store the redundant heat; the nitride belongs to a high-heat-conductivity material with high stability, and can be used for tightly connecting the phase change body with the aloe elastomer, so that the phase change body can quickly absorb redundant heat of a human body through the nitride and the aloe elastomer in sequence in an environment of 40-55 ℃; cooling the human body.
In the phase change body, sodium sulfate decahydrate and sodium hydrogen phosphate dodecahydrate can form eutectic hydrated salt with the melting temperature of 32.05 ℃, and can be used as a phase change material to store heat at high temperature and release heat at low temperature; the traditional cyclopropylamide can be used as a nucleating agent, so that the melted eutectic hydrated salt can be rapidly condensed and released, and the phase change latent heat of the eutectic hydrated salt can be improved due to the fact that the melting point is higher than 100 ℃; however, the larger the consumption of the cyclopropylamide provided with the nucleating agent, the larger the phase change latent heat of the eutectic hydrated salt is, so that the heat absorption and release of the phase change body are faster; therefore, the application adopts the short-chain naphthenic acid modified cyclopropylamide to improve the phase change latent heat of eutectic water and salt, so that when the cyclopropylamide is used as a nucleating agent to assist the condensation of sodium sulfate decahydrate and sodium hydrogen phosphate dodecahydrate, the melting temperature of a phase change body is only 5-15 ℃ higher than the summer temperature, and the comfort is higher when a human body contacts aloe cold-storage heat-conducting elastomer.
Optionally, the short-chain naphthenic acid is cyclobutyl formic acid or cyclopentanic acid.
By adopting the technical scheme, the cyclobutylThe melting point of formic acid is-20 to-7 ℃, the melting point of cyclopentanecarboxylic acid is 3 to 5 ℃, and the reactive groups of cyclobutylformic acid, cyclopentanecarboxylic acid and cyclopropylamide are-COOH and-NH 4 The reason why the melting points of the cyclobutyl formic acid and the cyclopentanecarboxylic acid are low is that the cyclobutyl formic acid and the cyclopentanecarboxylic acid both contain short-chain naphthenes, and the reaction of the short-chain naphthenic acid modified cyclopropylamide does not affect the melting points of the cyclobutyl formic acid and the cyclopentanecarboxylic acid, so the short-chain naphthenic acid modified cyclopropylamide can be used as a preferable material for improving the phase change latent heat of the eutectic hydrated salt of sodium sulfate decahydrate and sodium hydrogen phosphate dodecahydrate.
Optionally, the preparation method of the short-chain naphthenic acid modified cyclopropylamide comprises the following steps: adding short-chain naphthenic acid and cyclopropylamide into chloroform, and reacting for 1-3h at the temperature of-5-20 ℃; then volatilizing and evaporating chloroform at 33-38 ℃ to obtain short-chain naphthenic acid modified cyclopropylamide.
By adopting the technical scheme, chloroform is used as a solvent, so that short-chain naphthenic acid and cyclopropylamide fully react, and after the reaction, 99% of chloroform can be completely volatilized directly at 33-38 ℃ to ensure the purity of the short-chain naphthenic acid modified cyclopropylamide, and the purity of the finally prepared short-chain naphthenic acid modified cyclopropylamide is higher.
Optionally, the nitride is one or more of magnesium nitride, aluminum nitride, and silicon nitride.
By adopting the technical scheme, the magnesium nitride, the aluminum nitride and the silicon nitride are used as the nitride, so that the stability is high, and on one hand, the three substances also have high heat conductivity coefficient, so that the heat between the aloe elastomer and the phase change body can be conducted sufficiently and rapidly; on the other hand, the three substances can surround the phase change body, so that the phenomenon that all components which are easy to melt in the phase change body enter the aloe elastomer after being melted and influence the temperature regulation property of the phase change body is avoided.
In a second aspect, the application provides a preparation method of an aloe cold-storage heat-conduction elastomer, which adopts the following technical scheme:
firstly, crushing aloe, and separating to obtain aloe juice and crushed slag;
secondly, heating aloe juice at high temperature, concentrating to 50-70% to obtain aloe juice concentrate; drying the crushed slag, and crushing to obtain powder;
thirdly, crushing the phase change body to obtain a granular phase change body precursor, and adhering nitride on the surface of the phase change body precursor through an adhesive to obtain a heat conduction phase change body;
fourthly, uniformly mixing the aloe juice concentrate, the powder and the thickener, adding the cross-linking agent, adjusting the pH value to 6-8, adding the heat conduction phase modification, uniformly mixing, heating, and injecting into a mould to obtain the aloe cold accumulation heat conduction elastomer.
By adopting the technical scheme, in the first step and the second step, the aloe juice and the crushed slag are separately processed, so that the aloe in the aloe cold-storage heat-conducting elastomer is fine and comfortable in touch sense, the crushed slag has a larger specific surface area, and cold storage heat conduction is facilitated; in the third step, the phase change body is coated with the high heat conduction material, which is favorable for the heat transmission between the phase change body and aloe in all directions; in the fourth step, as the main components of aloe are small molecules with average molecular weight of about 418Da, a cross-linking agent is added, and the polysaccharide component in aloe juice is combined with the cross-linking agent to obtain macromolecules after cross-linking, and the proper pH value is regulated, the prepared aloe cold-storage heat-conducting elastomer HAs certain strength and formability, HAs the Shore hardness of 25-28HA, is similar to human muscle, and is convenient for subsequent further application.
Optionally, the preparation steps of the phase variant are as follows: uniformly mixing sodium sulfate decahydrate, sodium hydrogen phosphate dodecahydrate and short-chain naphthenic acid modified cyclopropylamide at 32-37 ℃, and cooling to below 25 ℃ to obtain a phase variant.
By adopting the technical scheme, as the melting temperature of the sodium sulfate decahydrate is 32 ℃, the melting temperature of the sodium hydrogen phosphate dodecahydrate is 35 ℃, the melting temperature of the cyclopropylamide is more than 100 ℃, and the melting temperature of the short-chain naphthenic acid is lower than 10 ℃; thus, at 32-37 ℃, the solid powdery short-chain naphthenic acid modified cyclopropylamide is uniformly mixed with viscous liquid sodium sulfate decahydrate and sodium hydrogen phosphate dodecahydrate; cooling to below 25 deg.c, and forming phase change body with sodium sulfate decahydrate, sodium hydrogen phosphate dodecahydrate and short chain naphthenic acid modified cyclopropylamide as solid.
Optionally, in the fourth step, the weight ratio of aloe vera juice concentrate to powder is (8-10): 1.
By adopting the technical scheme, the aloe elastomer with certain hardness can be prepared by using the aloe concentrated juice and the aloe powder in proper proportion, so that the aloe elastomer can be used as a main body part of substances such as a mattress and the like which are in contact with a human body, and the aloe elastomer can conduct heat conduction and temperature reduction to the human body better.
Optionally, in the fourth step, the weight ratio of aloe juice concentrate to cross-linking agent is (8-10): 1.
By adopting the technical scheme, the aloe elastomer with certain hardness can be prepared by using the aloe concentrated juice and the cross-linking agent in proper proportion, so that the aloe elastomer can be used as a main body part of substances such as a mattress and the like which are in contact with a human body, and the aloe elastomer can conduct heat conduction and temperature reduction to the human body better.
In a third aspect, the application provides an application of aloe cold-storage heat-conduction elastomer, which adopts the following technical scheme:
an application of aloe cold-storage heat-conduction elastomer in mattress, eye patch, pillow, back cushion and insole is provided.
By adopting the technical scheme, the mattress, the eyeshade, the pillow, the back cushion and the insole which are made of the aloe cold-storage heat-conducting elastomer exceed the soft latex in the prior art, have elasticity under the condition of enough hardness, and are more suitable for physiological structures of human bodies after being made into the mattress; the aloe cold-storage heat-conducting elastomer has the advantage that the heat-conducting coefficient is slightly higher than that of a human body, and when the aloe cold-storage heat-conducting elastomer conducts heat to the human body in summer, the comfort of the human body is high.
In summary, the application has the following beneficial effects:
1. in the application, aloe cold accumulation heat conduction elastomer taking aloe as a main body is adopted, the heat conduction coefficient of aloe elastomer prepared by aloe is 0.479w/km, the heat conduction coefficient is slightly higher than that of human body, and the comfort level of the human body is higher when conducting heat; and the phase change latent heat is only 5-15 ℃ higher than the summer temperature, and the comfort is higher when the human body contacts the aloe cold accumulation heat conduction elastomer.
2. The magnesium nitride, aluminum nitride and silicon nitride have higher heat conductivity coefficients, and can conduct the temperature between the aloe elastomer and the phase change body sufficiently and rapidly; the phase change body can be surrounded, so that the easily-melted components in the phase change body are prevented from completely entering the aloe elastomer after being melted, and the temperature property of the phase change body is prevented from being influenced;
3. in the preparation method, the cross-linking agent is added, and the proper pH value is regulated, so that the polysaccharide component in the aloe juice can be promoted to be combined with the cross-linking agent to obtain macromolecules, so that the prepared aloe cold-storage heat-conducting elastomer has certain strength and formability, and is convenient for subsequent further application.
Drawings
Fig. 1 is intended to show the ambient temperature, the body temperature, and the temperature of the aloe cold-storage heat-conducting elastomer.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
The following examples and comparative examples are provided as sources of raw materials: the raw materials of the examples and the comparative examples are commercially available, and the ceramic inorganic adhesive uses a high-temperature resistant inorganic adhesive ZS-1071; phosphate buffer was used for pH adjustment.
Preparation example of phase modification
Preparation example 1
The preparation method of the phase variant comprises the following steps:
step S1: preparation of short-chain naphthenic acid modified cyclopropylamide: 5g of cyclobutyl formic acid and 5g of cyclopropylamide are added into 25mL of chloroform and stirred at the speed of 1000rpm for reaction for 3h under the condition of-5 ℃; then evaporating chloroform at 38 ℃ to obtain solid powdery short-chain naphthenic acid modified cyclopropylamide.
Step S2: preparation of phase variants: 50g of sodium sulfate decahydrate, 70g of sodium hydrogen phosphate dodecahydrate and 3g of short-chain naphthenic acid modified cyclopropylamide were mixed at 33℃and stirred at a speed of 100rpm for 10 minutes, and then cooled to 20℃to obtain a phase modification.
Preparation example 2
Step S1: preparation of short-chain naphthenic acid modified cyclopropylamide: 5g of cyclobutyl formic acid and 5g of cyclopropylamide are added into 25mL of chloroform and stirred at a speed of 1000rpm for reaction for 1h under the condition of 20 ℃; then, at the temperature of 33 ℃, the chloroform is volatilized and distilled off to obtain the solid powdery short-chain naphthenic acid modified cyclopropylamide.
Step S2: preparation of phase variants: 70g of sodium sulfate decahydrate, 50g of sodium hydrogen phosphate dodecahydrate and 6g of short-chain naphthenic acid modified cyclopropylamide are mixed at 37 ℃ and stirred at a speed of 100rpm for 10min, and then cooled to 25 ℃ to obtain a phase modification.
Preparation example 3
Step S1: preparation of short-chain naphthenic acid modified cyclopropylamide: 5g of cyclobutyl formic acid and 5g of cyclopropylamide are added into 25mL of chloroform and stirred at 1000rpm for reaction for 2h under the condition of 10 ℃; then evaporating chloroform at 36 ℃ to obtain solid powdery short-chain naphthenic acid modified cyclopropylamide.
Step S2: preparation of phase variants: 60g of sodium sulfate decahydrate, 60g of sodium hydrogen phosphate dodecahydrate and 4.5g of short-chain naphthenic acid modified cyclopropylamide are mixed at 35 ℃ and stirred at a speed of 100rpm for 10min, and then cooled to 25 ℃ to obtain a phase modification.
Preparation example 4
The difference from preparation example 3 is that the cyclobutylformic acid of preparation example 3 is replaced by an equal weight of cyclopentanecarboxylic acid.
Comparative preparation example 1
The difference from preparation 3 is that the cyclopropylamide of preparation 3 is replaced by an equal weight of urea.
Comparative example 2
The difference from example 3 is that the cyclobutylformic acid of preparation 3 is replaced by an equal weight of lunar silicic acid.
Comparative example 3
The difference from example 3 is that only step S2 is performed, the specific steps are as follows;
preparation of phase variants: 60g of sodium sulfate decahydrate, 60g of sodium hydrogen phosphate dodecahydrate and 4.5g of cyclopropylamide were mixed at 35℃and stirred at 100rpm for 10 minutes, and then cooled to 25℃to obtain a phase modification.
An embodiment of a preparation method of aloe cold-storage heat-conducting elastomer
Example 1
A preparation method of aloe cold-storage heat-conduction elastomer comprises the following steps:
firstly, crushing 200g of aloe vera, and centrifugally separating for 15min at a speed of 1000rpm by using a centrifugal machine to obtain aloe juice and crushed slag;
secondly, heating aloe juice to 150 ℃, keeping the vacuum degree at 0.68MPa, reacting for 2 hours, and concentrating to 60% of the original weight to obtain aloe juice concentrate; drying the residue at 135 ℃, pulverizing again, and sieving to obtain 40 mesh powder;
thirdly, crushing and sieving the phase-change body prepared in the preparation example 1 to obtain a granular phase-change body precursor with the grain diameter of 1-5mm, taking 20g of the granular phase-change body precursor with the grain diameter of 1-5mm, mixing 5g of silicon nitride powder with the grain diameter of 2-3 mu m with 5g of ceramic inorganic adhesive, spraying on the surface of the phase-change body precursor, and freeze-drying for 2 hours at the temperature of-4 ℃ to obtain a heat-conducting phase-change body;
fourthly, uniformly mixing 54g of aloe juice concentrate, 6g of powder and 0.4g of thickener corn starch, adding 6g of cross-linking agent, namely, trimethyl tetraurea, adjusting the pH to 7, adding 30g of heat conduction phase variant, uniformly mixing, heating to 60 ℃, reacting for 1h, and injecting into a die to obtain the aloe cold-storage heat conduction elastomer with the thickness of 10 mm; in actual production, the top surface and the bottom surface of the injection mold are pre-placed with polyester mesh cloth.
Example 2
A preparation method of aloe cold-storage heat-conduction elastomer comprises the following steps:
firstly, crushing 200g of aloe vera, and centrifugally separating for 15min at a speed of 1000rpm by using a centrifugal machine to obtain aloe juice and crushed slag;
secondly, heating aloe juice to 150 ℃, keeping the vacuum degree at 0.68MPa, reacting for 2 hours, and concentrating to 60% of the original weight to obtain aloe juice concentrate; drying the residue at 135 ℃, pulverizing again, and sieving to obtain 40 mesh powder;
thirdly, crushing and sieving the phase-change body prepared in preparation example 2 to obtain a granular phase-change body precursor with the particle size of 1-5mm, taking 10g of the granular phase-change body precursor with the particle size of 1-5mm, mixing 8g of silicon nitride powder with the particle size of 2-3 mu m with 8g of ceramic inorganic adhesive, spraying on the surface of the phase-change body precursor, and freeze-drying for 2 hours at the temperature of-4 ℃ to obtain a heat-conducting phase-change body;
fourthly, uniformly mixing 81g of aloe juice concentrate, 9g of powder and 0.4g of thickener corn starch, adding 9g of cross-linking agent, namely, trimethyl tetraurea, adjusting the pH to 7, adding 16g of heat conduction phase variant, uniformly mixing, heating to 60 ℃, reacting for 1h, and injecting into a die to obtain the aloe cold-storage heat conduction elastomer with the thickness of 10 mm; in actual production, the top surface and the bottom surface of the injection mold are pre-placed with polyester mesh cloth.
Example 3
A preparation method of aloe cold-storage heat-conduction elastomer comprises the following steps:
firstly, crushing 200g of aloe vera, and centrifugally separating for 15min at a speed of 1000rpm by using a centrifugal machine to obtain aloe juice and crushed slag;
secondly, heating aloe juice to 150 ℃, keeping the vacuum degree at 0.68MPa, reacting for 2 hours, and concentrating to 60% of the original weight to obtain aloe juice concentrate; drying the residue at 135 ℃, pulverizing again, and sieving to obtain 40 mesh powder;
thirdly, crushing and sieving the phase-change body prepared in the preparation example 3 to obtain a granular phase-change body precursor with the grain diameter of 1-5mm, taking 15g of the granular phase-change body precursor with the grain diameter of 1-5mm, mixing 6.5g of silicon nitride powder with the grain diameter of 2-3 mu m with 6.5g of ceramic inorganic adhesive, spraying on the surface of the phase-change body precursor, and freeze-drying for 2 hours at the temperature of-4 ℃ to obtain a heat-conducting phase-change body;
fourthly, uniformly mixing 67.5g of aloe juice concentrate, 7.5g of powder and 0.4g of thickener corn starch, then adding 7.5g of cross-linking agent trimethyl tetraurea, adjusting the pH to 7, adding 30g of heat conduction phase modification, uniformly mixing, heating to 60 ℃, reacting for 1h, and injecting into a die to obtain the aloe cold-storage heat-conduction elastomer with the thickness of 10 mm; in actual production, the top surface and the bottom surface of the injection mold are pre-placed with polyester mesh cloth.
Example 4
The difference from example 3 is that the phase change body prepared in example 3 was replaced with the phase change body prepared in example 4 in an equal weight.
Example 5
The difference from example 3 is that the silicon nitride powder of the third step in example 3 is replaced with an equal weight of magnesium nitride powder.
Example 6
The difference from example 3 is that the fourth step of adjusting pH to 7 in example 3 is replaced with adjusting pH to 6.
Example 7
The difference from example 3 is that the fourth step of adjusting pH to 7 in example 3 is replaced with adjusting pH to 8.
Example 8
The difference from example 3 is that the amount of aloe juice concentrate and powder used in the fourth step of example 3 is changed; instead, 62.5g aloe juice concentrate, 12.5g powder; wherein the weight ratio of aloe juice concentrate to powder is 5:1.
Example 9
The difference from example 3 is that the amount of aloe juice concentrate and powder used in the fourth step of example 3 is changed; instead, 69.2g aloe vera juice concentrate, 5.8g powder; wherein the weight ratio of aloe juice concentrate to powder is 12:1.
Example 10
The difference from example 3 is that the aloe vera juice concentrate and the crosslinker of the fourth step of example 3 were varied in the amount of trimethyltetraurea; instead, 62.5g aloe vera juice concentrate, 12.5g of the crosslinker, trimethy tetraurea; wherein the weight ratio of aloe juice concentrate to the cross-linking agent of trimethyl tetraurea is 5:1.
Example 11
The difference from example 3 is that the aloe vera juice concentrate and the crosslinker of the fourth step of example 3 were varied in the amount of trimethyltetraurea; 69.2g aloe vera juice concentrate, 5.8g crosslinker trimethy tetraurea; wherein the weight ratio of aloe juice concentrate to the cross-linking agent of trimethyl tetraurea is 12:1.
Comparative example 1
The difference from example 3 is that the phase change body prepared in example 3 was replaced with the phase change body prepared in comparative example 1 of equal weight.
Comparative example 2
The difference from example 3 is that the phase change body prepared in example 3 was replaced with the phase change body prepared in comparative example 2 of equal weight.
Comparative example 3
The difference from example 3 is that the phase change body prepared in example 3 was replaced with the phase change body prepared in comparative example 3 of equal weight.
Comparative example 4
The difference from example 3 is that the silicon nitride powder of the third step in example 3 is replaced with an equal weight of graphene powder.
Comparative example 5
The difference from example 3 is that the phase change body prepared in preparation example 3 in example 3 is replaced by an equivalent weight of commercial phase change body, model: PCM-BM-35; name: a high molecular phase change material; the manufacturer: guangzhou New Material science and technology Co., ltd.
Comparative example 6
The difference from example 3 is that silicon nitride is not added in the third step.
Comparative example 7
The difference from example 3 is that the fourth step does not add a thermally conductive phase modification.
Performance test
The phase change bodies prepared in comparative preparation examples 1 to 3 were subjected to performance test by using preparation examples 1 to 4, and melting point and latent heat of phase change were detected; the detection basis is as follows: detecting melting point and latent heat of phase change by adopting a differential thermal analysis method; the detection results are shown in the following table 1;
performance tests were performed using the aloe cold-storage heat-conducting elastomers prepared in examples 1 to 11 and comparative examples 1 to 7, and the heat-conducting coefficient, shore hardness, compression recovery rate, and tensile rebound rate were detected; detecting Shore hardness by using a Shore A durometer, and detecting a heat conductivity coefficient by using an international standard of ASTM D5470; detecting compression recovery rate by JB/T9141.4-1999; the tensile resilience rate detection and calculation method comprises the following steps: stretching the length to 2 times of the original length, and multiplying the ratio of the detected length to the original length by 100% after 10 minutes; the detection results are shown in the following table 2;
TABLE 1
TABLE 2
Table 1 analysis of test results:
it can be seen from the combination of preparation examples 1, 2 and 3 that preparation examples 1, 2 and 3 differ only in the amount of raw materials for synthesizing phase modification, and the phase transition temperatures of preparation examples 1, 2 and 3 are all in the range of 40-55 ℃, which proves that the amounts of raw materials for preparation examples 1, 2 and 3 are suitable in the protection scope of the present application, wherein the raw material proportion of preparation example 3 is optimal.
As can be seen from the combination of preparation examples 3 and 4, preparation example 4 differs from preparation example 3 in that the cyclobutyl formic acid in preparation example 3 was replaced by cyclopentanecarboxylic acid, and the phase transition temperature of the phase transition prepared in preparation example 4 was in the range of 40-55℃and the latent heat of phase transition was also high.
As can be seen from the combination of preparation example 3 and comparative preparation examples 1, 2 and 3, in preparation example 1, cyclopropylamide is replaced by urea, in preparation example 2, cyclobutyl formic acid is replaced by Cheng Yue silicic acid, in preparation example 3, no cyclopropylformic acid is added, the phase transition temperatures of the phase-change bodies prepared in preparation examples 1, 2 and 3 are higher than 55 ℃ and are too different from the body temperature, and when the aloe cold-storage heat-conducting elastomer prepared by using the phase-change bodies finally contacts with a human body, the heat conductivity coefficient is greatly different from the human body, and the comfort level of the human body is lower.
Table 2 analysis of test results:
by combining the embodiments 1, 2 and 3, it can be seen that the embodiments 1, 2 and 3 are different in using ratio of raw materials, and the elastomers prepared in the preparation examples 1, 2 and 3 are respectively used, and the thermal conductivity coefficients of the finally prepared aloe cold-storage thermal-conductive elastomers are all between 0.46 and 0.49w/km and are close to the thermal conductivity coefficients of a human body of 0.46w/km; the Shore hardness is proper, and the compression recovery rate and the tensile rebound rate are both close to 100%; the raw materials of examples 1, 2 and 3 are properly used in the protection scope of the application, wherein the raw material proportion of example 3 is optimal.
In combination with examples 3 and 4, 5, it can be seen that example 4 differs from example 3 in that example 4 uses the elastomer prepared in preparation example 4; example 5 differs from example 3 in that example 5 uses magnesium nitride instead of silicon nitride; the thermal conductivity coefficients of the aloe cold-storage thermal-conductive elastomer finally prepared in the embodiments 4 and 5 are all between 0.46 and 0.49w/km and are close to the thermal conductivity coefficient of a human body of 0.46w/km; the Shore hardness is proper, and the compression recovery rate and the tensile rebound rate are both close to 100%; the elastomer prepared in preparation example 4 has better performance; magnesium nitride can be used instead of silicon nitride.
By combining the embodiments 3, 6 and 7, it can be seen that the embodiments 3, 6 and 7 are different in that in the process of preparing aloe cold-storage heat-conducting elastomer, the pH is 7, 6 and 8 respectively, and the heat conductivity coefficients of the prepared aloe cold-storage heat-conducting elastomer are all between 0.46 and 0.49w/km and are close to the heat conductivity coefficient of a human body of 0.46w/km; the Shore hardness is proper, and the compression recovery rate and the tensile rebound rate are both close to 100%; the prepared aloe cold-storage heat-conducting elastomer has better performance within the pH range of 6-8.
In combination with examples 3 and examples 8, 9, 10, 11, it can be seen that in example 3, the weight ratio of aloe vera juice concentrate to powder is 9:1 and the weight ratio of aloe vera juice concentrate to crosslinker is 9:1; in example 8, the weight ratio of aloe vera juice concentrate to powder was 5:1; in example 9, the weight ratio of aloe vera juice concentrate to powder was 12:1; in example 10, the weight ratio of aloe vera juice concentrate to the crosslinker, trimethyenetetraurea, was 5:1; in example 11, the weight ratio of aloe vera juice concentrate to the crosslinker, trimethyenetetraurea, was 12:1; the thermal conductivity coefficients of the aloe cold-storage thermal-conductive elastomer prepared in the embodiments 8, 9, 10 and 11 are all larger than 0.5w/km, and the difference between the thermal conductivity coefficients of the aloe cold-storage thermal-conductive elastomer and the thermal conductivity coefficients of the human body is slightly larger than 0.46w/km; the Shore hardness is not proper, the compression recovery rate is too low, and the tensile rebound rate is too high; the weight ratio of aloe juice concentrate to powder was found to be in the range of (8-10): 1, and the weight ratio of aloe juice concentrate to cross-linking agent was found to be in the range of (8-10): 1.
In combination with example 3 and comparative examples 1, 2 and 3, it can be seen that the elastomers prepared in comparative examples 1, 2 and 3 are used in comparative examples 1, 2 and 3, respectively, and the thermal conductivity coefficients of the aloe cold-storage thermal-conductive elastomers prepared in comparative examples 1, 2 and 3 are all greater than 0.7w/km, and the difference between the aloe cold-storage thermal-conductive elastomers and the thermal conductivity coefficients of human bodies is too great; finally, when the aloe cold-storage heat-conduction elastomer prepared by using the phase change material contacts with a human body for heat conduction, the human body comfort level is lower.
In combination with example 3 and comparative examples 4, 5, 6, and 7, it can be seen that in comparative example 4, graphene is used, and the thermal conductivity and shore hardness of the aloe cold-storage thermal-conductive elastomer are seriously affected due to the ultrahigh thermal conductivity and excessive hardness of graphene; in the comparative example 5, other phase variants are used, and the heat conductivity coefficient of the prepared aloe cold-storage heat-conducting elastomer is also higher; comparative example 6 without silicon nitride added, the phase change body was in direct contact with aloe elastomer; comparative example 7 was free of phase modification, and the thermal conductivity, shore hardness, compression recovery rate and tensile resilience of the aloe cold-storage thermal-conductive elastomer prepared in comparative examples 6 and 7 were all severely affected; the phase variants and nitrides of the application proved to be irreplaceable and indispensable.
As can be seen from fig. 1 of the specification, when the ambient temperature is 30 ℃, the temperature of the surface of the human body is 33 ℃, the temperature of the aloe cold-storage heat-conduction elastomer is 28.5 ℃, the temperature difference between the aloe cold-storage heat-conduction elastomer and the surface of the human body is 4.5 ℃, and when the aloe cold-storage heat-conduction elastomer is used as a mattress, the human body has good comfort.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (7)
1. The aloe cold-storage heat-conduction elastomer is characterized by comprising the following raw materials in parts by weight: 60-90 parts of aloe elastomer, 10-20 parts of phase modification and 5-8 parts of nitride, nitride coating phase modification, and are embedded in the aloe elastomer; the melting point of the phase variant is 40-55 ℃;
the aloe elastomer is prepared from aloe;
the phase change body is prepared from 50-70 parts of sodium sulfate decahydrate, 50-70 parts of sodium hydrogen phosphate dodecahydrate and 3-6 parts of short-chain naphthenic acid modified cyclopropylamide; the parts by weight are based on the phase change body;
the short-chain naphthenic acid is cyclobutyl formic acid or cyclopentanic acid;
the nitride is one or more of magnesium nitride, aluminum nitride and silicon nitride.
2. The aloe cold-storage heat-conducting elastomer according to claim 1, wherein the preparation method of the short-chain naphthenic acid modified cyclopropylamide is as follows: adding short-chain naphthenic acid and cyclopropylamide into chloroform, and reacting for 1-3h at the temperature of-5-20 ℃; then volatilizing and evaporating chloroform at 33-38 ℃ to obtain short-chain naphthenic acid modified cyclopropylamide.
3. A method for preparing an aloe cold-storage heat-conducting elastomer according to any one of claims 1-2, comprising the steps of:
firstly, crushing aloe, and separating to obtain aloe juice and crushed slag;
secondly, heating aloe juice at high temperature, concentrating to 50-70% to obtain aloe juice concentrate; drying the crushed slag, and crushing to obtain powder;
thirdly, crushing the phase change body to obtain a granular phase change body precursor, and adhering nitride on the surface of the phase change body precursor through an adhesive to obtain a heat conduction phase change body;
fourthly, uniformly mixing the aloe juice concentrate, the powder and the thickener, adding the cross-linking agent, adjusting the pH value to 6-8, adding the heat conduction phase modification, uniformly mixing, heating, and injecting into a mould to obtain the aloe cold accumulation heat conduction elastomer.
4. A method for preparing aloe cold-storage heat-conducting elastomer according to claim 3, wherein the phase-change body is prepared by the following steps: uniformly mixing sodium sulfate decahydrate, sodium hydrogen phosphate dodecahydrate and short-chain naphthenic acid modified cyclopropylamide at 32-37 ℃, and cooling to below 25 ℃ to obtain a phase variant.
5. The method of producing an aloe cold-storage heat-conducting elastomer according to claim 3, wherein in the fourth step, the weight ratio of aloe juice concentrate to powder is (8-10): 1.
6. The method of producing an aloe cold-storage heat-conducting elastomer according to claim 3, wherein in the fourth step, the weight ratio of aloe juice concentrate to crosslinking agent is (8-10): 1.
7. Use of the aloe cold-storage heat-conducting elastomer according to claim 1 in mattresses, eye masks, pillows, back pads, insoles.
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| CN105062428A (en) * | 2015-07-21 | 2015-11-18 | 浙江夏舒生物科技有限公司 | Cold accumulation and heat conduction composite soft crystal material |
| CN108997976A (en) * | 2017-06-07 | 2018-12-14 | 桂林市庆通有色金属工艺材料开发有限公司 | A kind of enhanced thermal conduction Inorganic phase change energy storage material and preparation method thereof |
| CN113214796A (en) * | 2021-04-12 | 2021-08-06 | 东南大学 | Composite inorganic salt phase change cold storage agent and preparation method thereof |
| CN114316497A (en) * | 2021-12-28 | 2022-04-12 | 青岛理工大学 | Phase change trigger type thermal interface material with low contact thermal resistance and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105062428A (en) * | 2015-07-21 | 2015-11-18 | 浙江夏舒生物科技有限公司 | Cold accumulation and heat conduction composite soft crystal material |
| CN108997976A (en) * | 2017-06-07 | 2018-12-14 | 桂林市庆通有色金属工艺材料开发有限公司 | A kind of enhanced thermal conduction Inorganic phase change energy storage material and preparation method thereof |
| CN113214796A (en) * | 2021-04-12 | 2021-08-06 | 东南大学 | Composite inorganic salt phase change cold storage agent and preparation method thereof |
| CN114316497A (en) * | 2021-12-28 | 2022-04-12 | 青岛理工大学 | Phase change trigger type thermal interface material with low contact thermal resistance and preparation method thereof |
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