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Method for preparing paraffin composite phase change energy storage material shaped by silica sol

A technology of composite phase change and energy storage materials, applied in the field of preparation of paraffin composite phase change energy storage materials, can solve the problems of high price of ethyl orthosilicate, aging of matrix materials, low latent heat of phase change, etc., and achieves easy popularization and application. , avoid product cost, good stability effect

Inactive Publication Date: 2008-12-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, composite phase change energy storage materials obtained with organic carriers have disadvantages such as relatively low latent heat of phase change, low thermal conductivity, high flammability, and aging of matrix materials.
Chen et al. (United States Patent: 4,504,402) used microencapsulation technology to wrap inorganic solid-liquid phase change materials with asphalt as a capsule material, and obtained a microencapsulated composite phase change energy storage material; The preparation technology of the encapsulation method is complicated and the controllability is poor. The volume effect produced during the solid-liquid phase transition has a great negative impact on the stability of the material, which directly affects the application of the material.
SiO invented by Tang Guoyi and others at Tsinghua University 2 The raw material used in the preparation method of the coated phase change material is ethyl orthosilicate, and the product is obtained by hydrolysis, but the price of ethyl orthosilicate is high and the toxicity is high; the existence of these shortcomings affects the paraffin-based high-performance composite phase change energy storage Material acquisition and practical application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0031] Step 1. Add 100ml of 20% silica sol into a 500ml beaker, add 100ml of deionized water, and stir evenly with a magnetic stirrer to obtain SiO 2 The content is 10% silicon hydrosol, stir well.

[0032] Step 2. In the silica sol obtained in step 1, put 12.0 g of n-octadecane, 2 ml of OP, and 0.1 g of alum.

[0033] Step 3. Heat the mixed system obtained in step 2 and keep stirring. Stop heating when the temperature rises to 80°C higher than the melting point of paraffin, and maintain the temperature for 1.0 to 2.0 hours. Stir quickly to allow the system to form an emulsion.

[0034] Step 4. Add precipitant ammonium carbonate and pH regulator dilute hydrochloric acid to the emulsion while maintaining the temperature of the emulsion system obtained in step 3, adjust the pH value of the system to 8.0, and continue stirring for 2 to 3 hours. At this time, a white precipitate will precipitate out of the system. Continue to stir until all the silicic acid is precipitated, and ...

Embodiment approach 2

[0038] Step 1. Put 100ml of 20% silica sol into a 500ml beaker, add 100ml of deionized water, and stir evenly with a magnetic stirrer to obtain SiO 2 The content is 10% silicon hydrosol, stir well.

[0039] Step 2. Put 10.0 g of section paraffin, 2 ml of OP, and 0.1 g of alum into the silica sol obtained in step 1.

[0040] Step 3, heating the mixed system obtained in step 2, and stirring continuously. Stop heating when the temperature rises to 80°C higher than the melting point of paraffin, and maintain the temperature for 1.0 to 2.0 hours. Stir quickly to allow the system to form an emulsion.

[0041] Step 4. Add precipitant urea and pH adjuster dilute hydrochloric acid to the emulsion while maintaining the temperature of the emulsion system obtained in step 3, adjust the pH of the system to 8.0, and continue stirring for 2 to 3 hours. At this time, a white precipitate will precipitate out of the system. Continue to stir until all the silicic acid is precipitated, and th...

Embodiment approach 3

[0045] Step 1. Add 100ml of 20% silica sol into a 500ml beaker, add 100ml of deionized water, and stir evenly with a magnetic stirrer to obtain SiO 2 The content is 10% silicon hydrosol, stir well.

[0046] Step 2. In the silica sol obtained in step 1, put 12.0 g of section paraffin, 3.0 g of OP, and 0.1 g of CMC sodium salt.

[0047] Step 3, heating the mixed system obtained in step 2, and stirring continuously. Stop heating when the temperature rises to 80°C higher than the melting point of paraffin, and maintain the temperature for 1.0 to 2.0 hours. Stir quickly to allow the system to form an emulsion.

[0048] Step 4. Add 4.0 g of precipitant NH to the emulsion while maintaining the temperature of the emulsion system obtained in step 3 4 HCO 3 , 0.5ml of n-butyl titanate, then adjust the pH value of the system to 6.0, and continue stirring for 2-3 hours. At this time, a white precipitate will precipitate out of the system. Continue to stir until all the silicic acid ...

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Abstract

Disclosed is a method for preparing wax composite phase change energy storage material for shaping silica sol, belonging to the technical filed of the preparation of composite phase change energy storage material for shaping. The invention takes silica sol and wax as materials, and during the preparation process, firstly, wax is added into the silica sol, then necessary addition agent is added; after that, the mixture is heated and blended fast so as to develop into emulsion; the pH valve of the system is adjusted or that precipitation reagent is added so as to make the mixture of wax and silicic acid to separate out from the system; in this way, wax composite phase change energy storage material for shaping silica sol can be prepared. The invention provides an economic, simple, convenient and practical universal method for preparing wax composite phase change energy storage material for shaping silica sol. The method has no pollution to the environment and the wax composite phase change energy storage material prepared through the method is high in purity and good in energy storage performance. Therefore, the method is of application prospect in the fields of constant temperature material, solar energy storage, energy utilization and conversion, and the utilization of waste heat and waste cold energy.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to the preparation of composite phase-change energy storage materials, in particular to a preparation method of paraffin composite phase-change energy storage materials shaped by silica sol. technical background [0002] The research on phase change materials as a kind of energy conversion and storage materials began in the 1940s. In 2001, the Annex17 program (advanced phase change energy storage and chemical energy storage technology and materials) launched by the United States further promoted the research in this field. . The working principle of phase change materials is to realize the absorption and release of heat (cold) in the environment through the energy change accompanying the material phase change process, so as to achieve the purpose of energy storage and control of the surrounding environment temperature. In recent years, issues such as the energy crisis and the heat ...

Claims

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Application Information

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IPC IPC(8): C09K5/06C08L91/06
Inventor 邓龙江王守绪翁小龙陈良
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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