Method for preparing polyethylene glycol/silicon dioxide composite shape-stabilized phase change energy storage material and product thereof

A polyethylene glycol and silica technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of high raw material cost, complex production process and high production cost, and achieve the effect of reducing production cost.

Inactive Publication Date: 2011-01-12
SOUTHWEST JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two main directions for the comprehensive utilization of silicon tetrachloride: one is to convert the silicon tetrachloride in the reduction tail gas into polysilicon raw material - trichlorosilane through high-temperature or low-temperature hydrogenation, and then return it to the polysilicon production system directly Polysilicon is produced, but only part of it can be utilized
The second is to use silicon tetrachloride to produce other chemical products, such as white carbon black, ethyl silicate and organic silicon products, etc., but due to cost and market problems, it is impossible to digest a large amount of silicon tetrachloride produced by polysilicon production
[0004] The currently published sol-gel method for the preparation of SiO 2 The silicon sources of shape-changing energy storage materials are mainly water glass and organosilicon compounds. Accelerators are often added during the preparation process. Because it is an endothermic reaction, an additional heat source is required. Not only the cost of raw materials is high, but also the production cycle is long. The process is more complicated and the production cost is higher, which is not conducive to SiO 2 The industrial production of shape-changing energy storage materials greatly limits the SiO 2 Engineering application of shape-changing energy storage materials

Method used

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  • Method for preparing polyethylene glycol/silicon dioxide composite shape-stabilized phase change energy storage material and product thereof
  • Method for preparing polyethylene glycol/silicon dioxide composite shape-stabilized phase change energy storage material and product thereof
  • Method for preparing polyethylene glycol/silicon dioxide composite shape-stabilized phase change energy storage material and product thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Steps: (1) Dissolve 12.0g PEG-6000 in 15.0ml water at room temperature to obtain a polyethylene glycol solution, and slowly add polycrystalline silicon production by-product SiCl dropwise under stirring with a magnetic stirrer 4 5.73ml, to make the whole gel. Take the gel out and place it in a watch glass, put the watch glass into a blast drying oven, and dry it to constant weight at 80°C to obtain a xerogel. Take out the xerogel, mash it in a mortar, and then Transfer to a watch glass and pulverize with a powerful mechanical pulverizer to obtain a powder. (2) Put the powder into a vacuum drying oven and vacuum-dry it at 40°C for 2.5 hours, further remove water and hydrogen chloride, and then put the powder into a container equipped with a stirrer, nitrogen pipe, reflux pipe, and dropping funnel In a 250ml four-necked bottle, under the protection of nitrogen, add the silane coupling agent KH-550 dropwise at a rate of 0.5% of the total powder weight at 80°C. After surfa...

Embodiment 2

[0026] Steps: (1) Dissolve 17.0g PEG-20000 in 17.0ml water at room temperature to obtain a polyethylene glycol solution, and slowly add polysilicon production by-product SiCl dropwise under stirring with a magnetic stirrer 4 5.74ml, to make the whole gel. Take the gel out and place it in a watch glass, put the watch glass into a blast drying oven, and dry it to constant weight at 80°C to obtain a xerogel. Take out the xerogel, mash it in a mortar, and then Transfer to a watch glass and pulverize with a powerful mechanical pulverizer to obtain a powder. (2) Put the powder into a vacuum drying oven and vacuum-dry it at 40°C for 2.0 hours to further remove water and hydrogen chloride, then put the powder into a container equipped with a stirrer, a nitrogen pipe, a return pipe, and a dropping funnel In a 250ml four-necked bottle, under the protection of nitrogen, add the silane coupling agent KH-560 dropwise at a rate of 0.1% of the total powder weight at 80°C. After surface modi...

Embodiment 3

[0028] Steps: (1) Dissolve 14.0g PEG-10000 in 20.0ml water at room temperature to obtain a polyethylene glycol solution, and slowly add polysilicon production by-product SiCl dropwise under stirring with a magnetic stirrer 4 11.5ml to make the whole gel. Take the gel out and place it in a watch glass, put the watch glass into a blast drying oven, and dry it to constant weight at 80°C to obtain a xerogel. Take out the xerogel, mash it in a mortar, and then Transfer to a watch glass and pulverize with a powerful mechanical pulverizer to obtain a powder. (2) Put the powder into a vacuum drying oven and vacuum-dry it at 40°C for 3.0 hours to further remove water and hydrogen chloride, then put the powder into a container equipped with a stirrer, nitrogen pipe, reflux pipe, and dropping funnel In a 250ml four-necked bottle, under the protection of nitrogen, add the silane coupling agent KH-570 dropwise at a rate of 0.3% of the total powder weight at 80°C. After surface modificatio...

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Abstract

The invention discloses a method for preparing a polyethylene glycol / silicon dioxide composite shape-stabilized phase change energy storage material and a product thereof. The method comprises the following steps of: dissolving polyethylene glycol serving as a work substance into water in an amount of between 0.2 and 1.0g / ml to obtain water solution of the polyethylene glycol; dripping a side product SiCl4 of polycrystalline silicon into the obtained water solution of the polyethylene glycol for a hydrolysis and sol-gel reaction to form gel with a three-dimensional network structure; drying the gel to prepare powder, removing water and hydrogen chloride from the powder; and dripping a modifier for modifying the surface of the powder hydrophobically in an amount which accounts for 0.1 to 1.5 weight percent of the powder at the temperature of 80 DEG C under the protection of nitrogen for surface modification to obtain the polyethylene glycol / silicon dioxide composite shape-stabilized phase change energy storage material. The method can change wastes into valuables and reduce the manufacturing cost of the product by using the side product SiCl4 of the polycrystalline as a silicon source, and is favorable for the industrial production and wide popularization and application of the SiO2 shape-stabilized phase change energy storage material.

Description

Technical field [0001] The invention relates to thermal energy storage materials, in particular to the field of manufacturing polyethylene glycol / silicon dioxide composite shape-fixed phase-change energy storage materials. Background technique [0002] In the process of producing polysilicon with improved Siemens, a large amount of by-product-silicon tetrachloride will be produced, and 10-15 kg of silicon tetrachloride will be produced for every kilogram of polysilicon produced. Silicon tetrachloride is a poisonous, harmful and highly corrosive liquid. If it is not recycled, it will cause great harm to the environment and human safety. According to statistics, there are more than 40 polysilicon manufacturers in my country that have been built or are under construction. The comprehensive utilization of silicon tetrachloride has become a technical bottleneck restricting the sustainable development of polysilicon in my country. At present, there are two main directions for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 赵乘寿田世富陈俊敏冯德志
Owner SOUTHWEST JIAOTONG UNIV
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