A kind of preparation method of cement-based modified porous material

A porous material and cement-based technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problem of restricting the popularization and application of composite phase change materials, restricting the energy storage effect of composite phase change materials, affecting the adsorption rate of phase change materials, etc. problems, achieve precise control of porosity and pore characteristics, good thermal conductivity, and improve poor thermal conductivity

Active Publication Date: 2022-05-06
北京时代思动科技有限公司
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the porous carriers in the prior art all have the following problems: First, the porosity of the material is small and unstable, which directly affects the adsorption rate of the phase change material and restricts the energy storage effect of the composite phase change material; secondly, the inorganic light Aggregate and recycled aggregate-based porous carriers have poor thermal conductivity and small heat storage capacity per unit volume; in addition, porous carbons, especially graphene and carbon nanotubes, are poor in economy when used as porous carriers, which limits the composite phase transition promotion and application of materials

Method used

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preparation example Construction

[0029] The invention provides 1. A method for preparing a cement-based modified porous material, characterized in that it comprises the following steps:

[0030] 1) Weigh the following raw materials in proportion by weight: 150-280 parts of cement, 0-120 parts of mineral admixture, 0.1-0.3 part of early strength agent, 0.2-0.5 part of water reducing agent, 0.2-1 part of glass fiber, 0.8-1.5 parts of thermally conductive carbon fiber, 40-100 parts of water, 25-45 parts of reinforced foam, and 0.2-0.8 parts of modifier;

[0031] 2) Prepare cement-based slurry: mix and stir cement, mineral admixture, early strength agent, glass fiber and heat-conducting carbon fiber in proportion, then add water and water reducing agent, mix and stir evenly, and prepare cement-based slurry;

[0032] 3) Preparation of enhanced foam: first dilute the foaming agent by 35-40 times, then mix evenly with foam enhancer and foam stabilizer, and prepare enhanced foam by mechanical foaming;

[0033] 4) Pr...

Embodiment 1

[0046] A preparation method of cement-based modified porous material, comprising the following steps:

[0047] 1) Mix 280kg of P·O 42.5 cement, 100kg of fly ash, 0.15kg of calcium stearate, 0.6kg of glass fiber, and 1.4kg of thermally conductive carbon fiber to make the glass fiber and thermally conductive carbon fiber evenly dispersed, and add 95kg of water while stirring and 0.45kg of water reducing agent, stirred into a uniform cement-based slurry;

[0048] 2) Weigh 250g of foaming agent, add 10kg of water to dilute, then add 20g of foam enhancer and 18g of foam stabilizer, after mixing evenly, under the action of a vacuum pump, the foaming agent and air are simultaneously pumped into the foaming machine and passed through the machine. Foaming method to prepare reinforced foam;

[0049] 3) Add 25kg of enhanced foam and 0.8kg of modifier to the cement-based slurry prepared in step 1) at the same time, adjust the speed of the mixer to 25r / min, stir for 50s to disperse the en...

Embodiment 2

[0053] With embodiment 1, difference is, the raw material proportioning in step 1) is as follows:

[0054] P·O 42.5 230 parts of cement, 80 parts of fly ash, 0.15 parts of calcium stearate, 0.5 parts of glass fiber, 1.3 parts of thermally conductive carbon fiber, 0.4 parts of water reducing agent, 78 parts of water, 30 parts of reinforced foam, modifier 0.7 parts.

[0055] The total porosity of the finished cement-based modified porous material obtained in this embodiment is 80%, the connected porosity is 68%, and the dry apparent density is 400kg / m 3 , The 28-day compressive strength is 3.0MPa, and the thermal conductivity is 0.30W / (m·K).

[0056] Using the cement-based modified porous material of this embodiment as a carrier, the adsorption rate of the adsorption phase change material can reach 75%. The heat storage and release efficiency of stone as a carrier is increased by 26%.

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Abstract

The invention provides a preparation method of cement-based modified porous material, which mainly comprises the following steps: weighing raw materials, preparing cement-based slurry, preparing reinforced foam, and preparing cement-based modified porous material. The method of the invention is simple in process and low in cost, and the prepared cement-based modified porous material has excellent strength, toughness and thermal conductivity, can be used as a phase change material adsorption carrier, and significantly improves the heat storage performance of the composite phase change material , to meet the needs of different projects.

Description

technical field [0001] The invention relates to the technical field of energy-saving energy storage materials, in particular to a preparation method of a cement-based modified porous material. Background technique [0002] In the current global energy shortage, the research and development of phase change energy storage technology has solved the mismatch between supply and demand caused by the instantaneous and unstable renewable energy. As an important branch of phase change energy storage technology, composite phase change materials can effectively suppress the leakage of liquid phase change materials, and have become a research hotspot in the field of new phase change heat storage materials. Composite phase change materials can be prepared by a porous adsorption method, that is, using a porous material with a rich pore structure as a carrier to absorb liquid phase change materials under negative pressure. Therefore, the selection of porous supports determines the perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B38/10C04B111/40
CPCC04B28/04C04B38/106C04B2201/20C04B2201/32C04B2201/50C04B2111/40C04B18/08C04B18/141C04B18/146C04B14/386C04B14/42C04B2103/10C04B2103/302C04B24/2623C04B24/122C04B24/32C04B24/026C04B22/10
Inventor 杨海娇李树谦吴金花刘子苑董成
Owner 北京时代思动科技有限公司
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