A kind of preparation method of room temperature inorganic phase change material

An inorganic phase change material, room temperature technology, applied in the chemical industry, can solve the problems of difficult preparation of manganese nitrate hexahydrate raw materials, no published patent documents, expensive and corrosive potassium fluoride tetrahydrate, etc., to achieve large latent heat of phase change, variety The effect of less and convenient operation

Active Publication Date: 2011-12-07
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Common hydrated salts in this temperature range include manganese nitrate hexahydrate (25.8°C) and potassium fluoride tetrahydrate (18.5°C), but manganese nitrate hexahydrate raw materials are not easy to prepare, and the price is relatively high; potassium fluoride tetrahydrate is expensive And strong corrosion, not suitable for energy storage materials
[0005] Through searching, no published patent documents related to this patent application have been found

Method used

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  • A kind of preparation method of room temperature inorganic phase change material
  • A kind of preparation method of room temperature inorganic phase change material

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0025] Formulate each component according to Table 1 and carry out the following experimental steps:

[0026] Step 1: Weigh 100g of anhydrous calcium chloride, add 100g of water, and dissolve it completely at 50°C to 80°C to obtain a 50% calcium chloride solution;

[0027] Step 2: get 50% calcium chloride solution prepared in step 1 without adding modifier bischofite, directly take out 20g of 50% calcium chloride solution as sample;

[0028] Step 3: Add 0.4g of nucleating agent to the sample in step 2, and then reheat to about 120°C to make it evenly mixed to form a fluid brine compound;

[0029] Step 4: crystallize the brine compound obtained in step 3 at a low temperature of 10°C, melt it at 30°C to 40°C, and then pour it into a container for packaging to obtain a finished inorganic room temperature phase change material.

[0030] The test results of this embodiment are shown in Table 1, and the phase transition temperature is 25.8°C.

Embodiment 2

[0032] Step 1: Weigh 100g of anhydrous calcium chloride, add 100g of water, and dissolve it completely at 50°C to 80°C to obtain a 50% calcium chloride solution;

[0033] Step 2: get 50% calcium chloride solution prepared in step 1 and add modifier bischolite, be mixed with 20g of brine compound containing 5% bischolite as sample;

[0034] Step 3: Add 0.4 g of nucleating agent to the sample in step 2, reheat to about 120°C, and mix it uniformly to form a fluid salt water compound;

[0035] Step 4: crystallize the brine compound obtained in step 3 at a low temperature of 10°C, melt it at 30°C to 40°C, and then pour it into a container for packaging.

[0036] The test results of this embodiment are shown in Table 1, and the phase transition temperature is 24.2°C.

Embodiment 3

[0038] Step 1: Weigh 100g of anhydrous calcium chloride, add 100g of water, and dissolve it completely at 50°C to 80°C to obtain a 50% calcium chloride solution;

[0039] Step 2: get 50% calcium chloride solution prepared in step 1 and add modifier bischolite, be mixed with 20g sample of brine compound containing 10% bischolite;

[0040] Step 3: Add 0.4 g of nucleating agent to the sample in step 2, reheat to about 120°C, and mix it uniformly to form a fluid salt water compound;

[0041] Step 4: crystallize the brine compound obtained in step 3 at a low temperature of 10°C, melt it at 30°C to 40°C, and then pour it into a container for packaging.

[0042] The test results of this embodiment are shown in Table 1, and the phase transition temperature is 22.5°C.

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Abstract

The invention relates to a preparation method of a room temperature inorganic phase-change material. The room temperature inorganic phase-change material is a hydrate which consists of calcium chloride, bischofite, water and a nucleating agent, wherein calcium chloride and bischofite are rich in raw material and cheap. The preparation method comprises the following steps: (1) heating calcium chloride or a hydrate thereof in an aqueous solution until the calcium chloride or the hydrate thereof is completely melted so as to prepare a calcium chloride solution with a special composition; (2) adding bischofite and the nucleating agent once and continuously stirring; (3) reheating and warming until the bischofite and the nucleating agent are fully melted so that an even fluid is formed by fully mixing; and (4) carrying out low temperature crystallization on the fluid, warming and melting again, then injecting into a container, and packaging. The room temperature phase-change material provided by the invention has rich raw materials, cheap price and large phase-change latent heat, and the phase-change temperature is 15 DEG C-26 DEG C; and repetition tests verify that the room temperature phase-change material has the advantages of stable property, small condensate depression, no phase separation and the like.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to the preparation of inorganic phase change materials, in particular to a preparation method of greenhouse inorganic phase change materials. Background technique [0002] Phase change materials can absorb heat (cold) from the environment during their phase change, and release heat (cold) to the environment when needed, so as to achieve the purpose of controlling the temperature of the environment. In the field of construction, as people have higher and higher requirements for the comfort of the living environment, the energy consumption of construction, heating and living is high. If phase change materials are applied to building materials, the circulation heat capacity of phase change materials can not only reduce building energy consumption, but also improve building comfort and improve the environment, opening up a new way for the development of building energy conservation. . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 邓天龙高道林郭亚飞王士强闫东军章磊汤艳荣
Owner TIANJIN UNIV OF SCI & TECH
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