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Organic-inorganic coupling phase change material without leakage at normal temperature

A technology of phase change materials and composite materials, applied in the field of organic-inorganic coupling phase change materials, can solve problems such as liquid leakage, poor packaging, and reduced heat transfer rate of materials, and achieve fast heat transfer rate, low cost, and easy operation Effect

Active Publication Date: 2021-10-22
TARIM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic phase change materials have the advantages of stability and no overcooling phenomenon that inorganic phase change materials do not have, but there are phenomena such as poor packaging and liquid leakage.
[0003] Wu Qihui et al., Gu Qingjun et al. used the melt blending method to compound the two materials, and the heat transfer rate of the obtained material was reduced.

Method used

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  • Organic-inorganic coupling phase change material without leakage at normal temperature
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  • Organic-inorganic coupling phase change material without leakage at normal temperature

Examples

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Effect test

preparation example Construction

[0039] (2) Preparation of organic-inorganic coupling phase change materials

[0040] Weigh a certain amount of acrylamide as a polymerizable monomer, N,N-methylenebisacrylamide as a crosslinking agent, and polyvinylpyrrolidone as a co-emulsifier, put the three into the same beaker, and add 5mL of distilled water to the beaker , dissolve acrylamide into the water phase under ultrasound for later use. Take out the beaker containing the acrylamide aqueous solution and put it into a water bath for stirring, add the oil-in-water emulsifier Tween 85 into the water phase, stir for 10 minutes, then slowly and evenly add the molten organic phase cetyl alcohol into the water phase phase, under the joint action of emulsifier and co-emulsifier, continue stirring to make cetyl alcohol-in-water emulsion. Then add the sodium sulfate decahydrate / diatomite composite material into the cetyl alcohol-in-water emulsion, and after stirring evenly, quickly mix ammonium persulfate (oxidant) and N,N,...

Embodiment 1

[0042] (1) Preparation of sodium sulfate decahydrate / diatomite composite material

[0043] According to the mass ratio of sodium sulfate decahydrate: diatomaceous earth = 4:1, weigh 4.00 grams of sodium sulfate decahydrate (SSD) and 1.00 grams of dried diatomaceous earth, mix them evenly and place them at 30 °C Dry it in a vacuum drying oven for 4 hours, and use vacuum impregnation and physical adsorption to adsorb the inorganic hydrated salt sodium sulfate decahydrate into diatomite with a porous structure. Put the prepared sodium sulfate decahydrate / diatomite composite phase change material into an oven at 30°C to dry for 6-8 hours, take it out after drying, grind and sieve, and make a sodium sulfate decahydrate / diatomite composite material as a spare .

[0044] (2) Preparation of organic-inorganic coupling phase change materials

[0045] Weigh 1.60 grams of acrylamide as a polymerization monomer, 0.40 grams of N,N-methylenebisacrylamide as a crosslinking agent, and 0.01 g...

Embodiment 2

[0047] The added quality of cetyl alcohol is 5 grams, and others are the same as in Example 1.

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Abstract

The invention relates to an organic-inorganic coupling phase change material without leakage at normal temperature. The material is prepared by the following steps: adsorbing sodium sulfate decahydrate into diatomite through vacuum adsorption and physical adsorption to prepare a sodium sulfate decahydrate / diatomite composite material; adding acrylamide, N, N-methylene bisacrylamide, polyvinylpyrrolidone and distilled water into a beaker, dissolving acrylamide into a water phase under ultrasonic waves, adding an emulsifier and hexadecanol, and stirring; and adding the sodium sulfate decahydrate / diatomite composite material, uniformly stirring, and quickly adding ammonium persulfate and N, N, N, N-tetramethylethylenediamine to polymerize the composite material into a solid, thereby obtaining the organic-inorganic coupling phase change material. The sodium sulfate decahydrate / diatomite composite material and hexadecanol are coated in polyacrylamide by an emulsion polymerization method, so that the phase separation phenomenon of sodium sulfate decahydrate is relieved; and the phase change latent heat of the obtained phase change material is 164.13 J / g, the heat conductivity coefficient is 0.2061 W / (m.k), and good heat storage performance is shown.

Description

technical field [0001] The invention relates to the technical field of new material preparation, in particular to an organic-inorganic coupling phase change material without leakage at room temperature. Background technique [0002] Phase change materials are capable of singularly changing physical states while maintaining a constant temperature, while their chemical properties remain unchanged. According to the phase change temperature, it can be divided into low temperature phase change materials, medium temperature phase change materials and high temperature phase change materials. Common phase change energy storage materials can be divided into two categories based on chemical composition: organic and inorganic, both of which have their own advantages. Organic phase change materials have the advantages of stability and no overcooling phenomenon that inorganic phase change materials do not have, but there are phenomena such as poor packaging and liquid leakage. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/06
Inventor 吕喜风张路祥李旭白金刚
Owner TARIM UNIV
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