Preparation method of diatom-based hydrated calcium silicate powder moisture regulating material

A technology of hydrated calcium silicate powder and humidity control material, applied in chemical instruments and methods, other chemical processes, etc., can solve the problem of inability to achieve reversible adsorption/desorption of a large amount of water vapor, difficulty in water molecule migration/diffusion, mesoporous , low content of macropores, etc., to achieve the effect of strong moisture absorption and release ability of the product, cheap raw materials, and easy availability of raw materials

Inactive Publication Date: 2018-07-10
SHENYANG JIANZHU UNIVERSITY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The reason is mainly because although the microporous structure in cement concrete and other building materials products is rich, the content of mesopores and macropores is low, and the pores are not connected to each other, resulting in the migration / diffusion of water molecules inside the product. Difficult to achieve reversible adsorption / desorption of a large amount of water vapor, and it is impossible to obtain building materials with excellent humidity control performance

Method used

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  • Preparation method of diatom-based hydrated calcium silicate powder moisture regulating material
  • Preparation method of diatom-based hydrated calcium silicate powder moisture regulating material
  • Preparation method of diatom-based hydrated calcium silicate powder moisture regulating material

Examples

Experimental program
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Effect test

Embodiment 1

[0029] In this example, Jilin Changbai produces diatomite, SiO 2 The content is 61.38% by mass percentage, and the specific surface area is 65m 2 / g. Using diatomite as raw material, the specific process and technical parameters of the diatom-based calcium silicate hydrate powder humidity-conditioning material are:

[0030] (1) Mix diatomaceous earth and calcium hydroxide according to the calcium-silicon molar ratio of 0.45, add mixing water with a dry weight of 20% and continue mixing until completely uniform;

[0031] (2) The reaction mixture is subjected to a hydrothermal reaction for 4 hours in a saturated water vapor environment at 200°C;

[0032] (3) The obtained sample is moderately ground after drying to obtain a diatom-based calcium silicate hydrate powder humidity control material.

[0033] The X-ray diffraction (XRD) results of the calcium silicate hydrate powder obtained by the hydrothermal reaction are shown in figure 1 , analysis showed that the reaction prod...

Embodiment 2

[0036] In this example, the diatom-based calcium silicate hydrate powder humidity-conditioning material was prepared according to the steps of Example 1, the difference is that calcium oxide is used as the calcium raw material in step (1), and the calcium-silicon molar ratio is adjusted to 1.0; other operating steps and conditions are the same. The X-ray diffraction (XRD) results of the calcium silicate hydrate powder obtained by the hydrothermal reaction are shown in figure 1, the analysis showed that the reaction product in the powder was mainly semi-crystalline calcium silicate hydrate CSH (B), but the diffraction peak of calcium hydroxide remained, indicating that the calcium oxide in the raw material was excessive. The humidity control performance test shows that the 24h moisture absorption of the powder in an environment with a relative humidity of 75% after drying (105°C) reaches 6.56% (mass percentage), and then the 24h moisture release in an environment with a relativ...

Embodiment 3

[0038] In this example, the diatom-based calcium silicate hydrate powder humidity-conditioning material was prepared according to the steps of Example 1, the difference being that the hydrothermal reaction conditions in step (2) were adjusted to 120°C and 4h; other operating steps and Same conditions. The scanning electron microscope (SEM) microscopic morphology of calcium silicate hydrate powder obtained by hydrothermal reaction is shown in figure 2 (a), indicating that the hydration product is calcium silicate hydrate with poor crystallinity, and the reaction is not complete. Nitrogen adsorption experiments show that the pore content of the calcium silicate hydrate powder in the range of 2-50nm pore diameter reaches 0.012cm 3 / g, the humidity control performance test shows that the moisture absorption of the powder after drying (105°C) in an environment with a relative humidity of 75% reaches 5.31% (mass percentage) for 24 hours, and then it is transferred to an environmen...

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Abstract

The invention relates to the field of inorganic functional powder, in particular to a preparation method of a diatom-based hydrated calcium silicate powder moisture regulating material. Diatomaceous earth serves as a natural mineral raw material and is subjected to a combination reaction with calcium raw materials and water in high-temperature saturated steam to form the powder moisture regulatingmaterial with hydrated calcium silicate as a main component. The method is characterized by comprising the steps that (1) diatomaceous earth and the calcium raw materials are matched and evenly mixedaccording to a certain proportion, mixing water the mass of which is 20-50% of that of the dry materials is added, and mixing continues to be conducted until the materials are completely uniform; (2)the reaction mixture is subjected to a hydrothermal reaction in the saturated steam environment at 120-240 DEG C for 2-24 hours; (3) an obtained sample is dried and moderately ground to obtain the diatom-based hydrated calcium silicate powder moisture regulating material. By means of the method, the powder material with hydrated calcium silicate as the main component can be obtained, the abundantmesoporous structure of diatomaceous earth can be reserved to a certain extent, the powder material is endowed with the considerable moisture absorption and desorption capacity accordingly, and the moisture regulating performance is excellent.

Description

technical field [0001] The invention relates to the field of inorganic functional powders, in particular to a method for preparing a diatom-based calcium silicate hydrate powder humidity-conditioning material. Background technique [0002] In people's production and life, air conditioning equipment is usually used to maintain a comfortable temperature and humidity in the living environment, but there are disadvantages such as high equipment investment and high energy consumption. In addition, it is easy to cause indoor air quality problems and affect people's physical and mental health. [0003] Humidity-regulating materials refer to materials that can sense changes in air temperature / humidity in the space they are in according to their own moisture absorption / release performance, and can automatically adjust the relative humidity of the air without consuming artificial energy. The preservation quality of items, more importantly, has far-reaching significance for reducing en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/14B01J20/30
CPCB01J20/10B01J20/14B01J2220/42B01J2220/4806
Inventor 佟钰马秀梅赵竹玉李晓王晴
Owner SHENYANG JIANZHU UNIVERSITY
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