Method for preparing gradient directional porous cement based on two-phase pore former system freezing molding technology

A pore-forming agent and system technology, which is applied in the field of porous cement preparation, can solve the problems of high-temperature heat treatment and complicated preparation process, and achieve the effect of avoiding the collapse and cracking of the pattern

Inactive Publication Date: 2017-06-27
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a gradient-oriented porous cement material with simple process, low cost, no need for post-treatment, and the ability to customize the pore structure according to different application requirements, which solves the problem of the preparation of traditional inorganic porous materials (such as ceramics, zeolites, etc.) The complex process and the need for high-temperature heat treatment further broaden the potential application range of traditional building materials-cement

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  • Method for preparing gradient directional porous cement based on two-phase pore former system freezing molding technology
  • Method for preparing gradient directional porous cement based on two-phase pore former system freezing molding technology
  • Method for preparing gradient directional porous cement based on two-phase pore former system freezing molding technology

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Embodiment 1

[0043] A method for preparing gradient oriented porous cement based on two-phase pore-forming agent system freeze molding technology, comprising the following steps:

[0044] (1) Preparation of cement mixture slurry based on the two-phase pore-forming agent system: Weigh all the raw materials according to the ratio in Table 1, and add the dispersant (polyvinylpyrrolidone) and binder (ethyl cellulose) to the two-phase Porogen system (TBA-H 2 In (0), mechanically stir for 1 hour to obtain a uniformly dispersed organic mixture, then put the organic mixture and Portland cement powder into a ball mill for ball milling for 12 hours, and obtain a uniformly dispersed cement-based mixed slurry after vacuum degassing;

[0045] (2) Preparation of frozen cement-based body: inject the above-mentioned cement-based mixed slurry into a self-made directional freezing mold for directional freezing and shaping. The freezing temperature is -40°C and the freezing time is 0.5h. It is carefully rel...

Embodiment 2

[0049] A method for preparing gradient oriented porous cement based on two-phase pore-forming agent system freeze molding technology, comprising the following steps:

[0050] (1) Preparation of cement mixture slurry based on the two-phase pore-forming agent system: Weigh all the raw materials according to the ratio in Table 1, and add the dispersant (gum arabic) and binder (polyethylene) to the two-phase pore-forming agent system (TBA-H 2 (0), stir mechanically for 2 hours to obtain a uniformly dispersed organic mixed solution, then put the organic mixed solution and composite Portland cement powder into a ball mill for ball milling for 24 hours, and obtain a uniformly dispersed cement-based mixed slurry after vacuum degassing ;

[0051] (2) Preparation of frozen cement-based body: inject the above-mentioned cement-based mixed slurry into a self-made directional freezing mold for directional freezing and shaping. The freezing temperature is -60°C and the freezing time is 1 h....

Embodiment 3

[0055] A method for preparing gradient oriented porous cement based on two-phase pore-forming agent system freeze molding technology, comprising the following steps:

[0056] (1) Preparation of cement mixture slurry based on two-phase pore-forming agent system: Weigh all raw materials according to the ratio in Table 1, add dispersant (polyethylene glycol) and binder (polyvinyl butyral) to the two-phase pore former system (TBA-H 2 In (0), mechanically stir for 1.5h to obtain a uniformly dispersed organic mixed solution, then put the organic mixed solution and pozzolanic cement powder into a ball mill for ball milling for 48h, and obtain a uniformly dispersed cement-based mixed slurry after vacuum degassing;

[0057] (2) Preparation of frozen cement-based body: inject the above-mentioned cement-based mixed slurry into a self-made directional freezing mold for directional freezing and shaping. The freezing temperature is -80°C and the freezing time is 2 hours. Carefully eject fr...

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Abstract

The invention discloses a method for preparing a gradient directional porous cement based on a two-phase pore former system freeze molding technology, and belongs to the technical field of porous material preparation methods. Cement powder is stirred and mixed with a mixed solution based on a two-phase pore former system to form a uniform system, and a gradient directional porous cement material is obtained through freeze forming, freeze drying and maintenance in sequence; the porous material structurally comprises directional macropores and interior mesopores, the pore size distribution is 3 nm to 400 microns, the porosity is 40% to 65%, and the porous material has the characteristics of uniform pore distribution, various open-framework structures and excellent directional degree. According to the method, the pore passage morphology of the prepared gradient directional porous cement is regulated and controlled by changing the proportion of tert butyl alcohol to water, so that different application requirements are met; moreover, the preparation technology is simple and convenient, relatively low in cost and simple and mild in maintenance conditions, the problem of style collapse cracking caused by a traditional high-temperature sintering method is avoided, and the method is more energy-saving and environmentally-friendly.

Description

technical field [0001] The invention relates to a method for preparing porous cement, in particular to a method for preparing gradient oriented porous cement based on a two-phase pore-forming agent system freeze molding technology. Background technique [0002] Porous materials with gradient pore structure distribution are widely used, such as membrane separation, catalytic reaction, bio-scaffold preparation and electrochemical energy storage. The special properties of these materials are determined by their internal micropores, mesopores and macropores. Traditionally, methods for preparing multi-layered pore structures mainly include sol-gel method, extrusion method, sacrificial template method, etc. Although the porous materials obtained by these processes have high open porosity, they cannot precisely control the pore structure and morphology according to specific requirements, and these methods are more complicated to operate and the process cost is higher. [0003] As...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/04C04B38/06C04B28/04C04B28/02C04B28/08
Inventor 高学理董森杰王小娟
Owner OCEAN UNIV OF CHINA
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