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Preparation method of straw phase change plate with phase change heat storage and insulation function

A phase change heat storage, straw board technology, applied in flat products, household appliances, manufacturing tools, etc., can solve the problem of low utilization rate of straw resources, achieve good durability, reduce supercooling, and prevent leakage loss. Effect

Inactive Publication Date: 2019-11-12
江苏禾吉新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resource utilization rate of straw is low. At present, most of the straw is disposed of by burning or directly discarding, which brings great pressure to the environment.

Method used

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  • Preparation method of straw phase change plate with phase change heat storage and insulation function
  • Preparation method of straw phase change plate with phase change heat storage and insulation function
  • Preparation method of straw phase change plate with phase change heat storage and insulation function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Straw pretreatment: crush the straw with a hay cutter, and sieve through a 10 mm standard to obtain straw powder. o C to dry to less than 1% moisture content;

[0023] (2) Loading and packaging of phase change materials: at 40 o Prepare saturated Na at C 2 SO 4 solution, then in saturated Na 2 SO 4 Add borax and polyvinyl alcohol solution to the solution to obtain a phase-change mixed solution, and Na in the phase-change mixed solution 2 SO 4 :H 2 O: borax: the mass ratio of polyvinyl alcohol is 1:2:0.02:0.10. Add straw powder into the mixer, and add the phase-change mixture while stirring, so that the phase-change mixture and the straw are evenly mixed, and dry at room temperature to obtain the phase-change straw. The mass ratio of straw powder:phase-change mixture is 1:6 .

[0024] (3) Molding of straw plates: using geopolymer as the binder of phase-change straws, straw phase-change plates were prepared by compression molding. In the mixer, add the phase...

Embodiment 2

[0028] Design 5 groups of parallel experiments, the basic steps are the same as in Example 1, the difference is that the amount of nucleating agent borax is changed, other conditions are the same as in Example 1, and the influence of the amount of nucleating agent on the degree of phase transition supercooling is investigated. Among them, 1 group did not add borax (sample 2-1), and the other 4 groups experimented with Na 2 SO 4 :H 2 The mass ratio of O: borax: polyvinyl alcohol is 1:2:0.01:0.10 (sample 2-2), 1:2:0.02:0.10 (sample 2-3), 1:2:0.04:0.10 (sample 2) -4), 1:2:0.05:0.10 (sample 2-5).

[0029]

[0030] The experimental results show that the addition of nucleating agent borax can effectively reduce the supercooling degree of phase change materials.

Embodiment 3

[0032] Design 4 groups of parallel experiments, the basic steps are the same as in Example 1, the difference is that the amount of polyvinyl alcohol added is changed, and other conditions are the same as in Example 1, to investigate the effect of the amount of polyvinyl alcohol on the performance of the board. Among them, one group did not add polyvinyl alcohol (sample 3-1), and the other three groups experimented with Na 2 SO 4 :H 2 The mass ratio of O: borax: polyvinyl alcohol is 1:2:0.01:0.06 (sample 3-2), 1:2:0.01:0.10 (sample 3-3), 1:2:0.01:0.16 (sample 3 -4).

[0033] After 5 phase change cycles, the optical microscope observation found that the solid particles of sample 3-1 and 3-2 phase change materials increased significantly, and there was a phase separation phenomenon, while the plates of samples 3-3 and 3-4 after 100 phase change cycles The appearance did not change significantly.

[0034] The experimental results show that an appropriate amount of polyvinyl al...

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Abstract

The invention discloses a preparation method of a straw phase change plate with a phase change heat storage and insulation function. According to the straw plate, environment-friendly and renewable crop straws are used as raw materials, a large number of micropores existing in the straw are used for loading and packaging an inorganic phase change material Na2SO4.10H2O, and the inorganic phase change material and the inorganic binder geopolymer cement are subjected to compression molding to obtain the straw plate. The preparation method comprises the first step of straw pretreatment, the secondstep of loading and packaging of phase change materials in micropores of straw, and the third step of compression molding of the straw plate. Compared with the prior art, according to the prepared straw plate, the apparent density is less than or equal to 300 kg / m<3>, the thermal conductivity is less than or equal to 0.08 W / (m.K), the phase change heat can reach 143.3 J / g, and the straw plate hasa good application prospect in the field of thermal insulation building materials.

Description

technical field [0001] The invention relates to the technical field of phase change plate preparation, in particular to a method for preparing a straw phase change plate with the function of phase change heat storage and heat preservation. Background technique [0002] With the rapid development of industrialization and urbanization, my country pays more and more attention to building energy conservation. Building energy saving is mainly achieved by using green and environmentally friendly building materials and reducing the heat transfer coefficient of building envelopes. At present, less than 5% of the existing building areas in my country's urban and rural areas meet the energy-saving standards. Therefore, the development of new thermal insulation building materials is not only the demand of building energy saving, but also the demand of the market. [0003] my country is a big agricultural country with abundant straw resources. However, the resource utilization rate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N1/02B27N3/08B27N3/10B27L11/06
CPCB27L11/06B27N1/0209B27N3/08B27N3/10
Inventor 王路明张峰钟栋青刘华臣蒋蕾季杰
Owner 江苏禾吉新材料科技有限公司
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