Diatomite-based hierarchical porous composite humidity-controlling material and preparation method thereof

A technology for humidity control material and diatomite, which is applied in silicon compounds, chemical instruments and methods, and other chemical processes, etc., can solve the problems of weak moisture absorption and release ability, unreasonable pore structure, etc., and achieves low production cost and good application. Prospect, effect of improving humidity control performance

Pending Publication Date: 2021-05-11
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the above-mentioned characteristics that the single diatomite humidity-controlling material has weak moisture absorption and desorption capacity, and the traditional diatomite-based material channel mechanism is unreasonable, and proposes a diatomite-based silicon source to reduce corrosion of in

Method used

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  • Diatomite-based hierarchical porous composite humidity-controlling material and preparation method thereof
  • Diatomite-based hierarchical porous composite humidity-controlling material and preparation method thereof
  • Diatomite-based hierarchical porous composite humidity-controlling material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Raw material introduction: Diatomite concentrate comes from Linjiang Beifeng Diatomite Co., Ltd., the main chemical composition and content are SiO 2 86.97%, Al 2 o 3 3.76%, Fe 2 o 3 2.13%, MgO 0.23%, CaO 0.35%, particle size 200 mesh sieve is less than 2.0%; sodium hydroxide is from Chengdu Jinshan Chemical Reagent Co., Ltd., analytically pure; oxalic acid is from Chengdu Kelong Chemical Co., Ltd., crystalline aluminum chloride is from Chengdu City Kelong Chemicals Co., Ltd.

[0032] The preparation process steps are as follows:

[0033] Mix diatomite and sodium hydroxide according to the mass ratio of 1.75, and dissolve in alkali at a temperature of 80°C for 30 minutes to prepare a mixed pulp containing sodium silicate and diatomite; then add oxalic acid solution with a mass fraction of 60% to the mixed pulp , Acid analysis of sodium silicate to generate precipitated white carbon black, add crystalline aluminum chloride and sodium hydroxide at a molar ratio of ...

Embodiment 2

[0047] The raw materials and process steps are the same as those in Example 1, except that the diatomite and sodium hydroxide are proportioned in a mass ratio of 2.0, and the temperature is 60° C. for 20 minutes to prepare a mixed pulp containing sodium silicate and diatomite. Adding mass fraction to the mixed pulp again is 50% oxalic acid solution, acid analysis of sodium silicate to generate precipitated white carbon black, adding crystalline aluminum chloride and sodium hydroxide with a molar ratio of 1:2, and aging the mixed pulp 120min, stirred evenly, then transferred to a reaction kettle for hydrothermal reaction at 150°C for 9h. The method for measuring the humidity-conditioning performance of the sample in the example is the same as in Example 1, and the results are listed in Table 1.

Embodiment 3

[0049] The raw materials and process steps are the same as those in Example 1, except that the diatomite and sodium hydroxide are proportioned in a mass ratio of 2.5, and the temperature is 50° C. for 40 minutes to prepare a mixed pulp containing sodium silicate and diatomite. Adding mass fraction to the mixed pulp again is 40% oxalic acid solution, acid analysis sodium silicate generates precipitated white carbon black, adds crystalline aluminum chloride and sodium hydroxide with a molar ratio of 1:3, and ages the mixed pulp 60min, stirred evenly, transferred to the reaction kettle, and hydrothermally reacted at 100°C for 6h. The method for measuring the humidity-conditioning performance of the samples in the examples is the same as that in Example 1.

[0050] The results are listed in Table 1.

[0051] Table 1, Example sample humidity control performance and pore structure characteristics

[0052]

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Abstract

The invention relates to a diatomite-based hierarchical porous composite humidity-controlling material and a preparation method thereof, diatomite is used as a silicon source and a carrier, a partial alkali dissolution-hydrothermal forming method is adopted, the diatomite and sodium hydroxide are subjected to alkali dissolution for 10-40 min at the temperature of 50-80 DEG C according to the mass ratio of 1.5-3.5, and mixed ore pulp of sodium silicate and diatomite is prepared; and an oxalic acid solution with the mass fraction of 30%-60% and low corrosivity is added into the mixed ore pulp, acidification is carried out to generate white carbon black, crystalline aluminum chloride and sodium hydroxide are added according to the molar ratio of 1: 3-1: 1, aging is carried out for 30-150 minutes, uniformly stirring is carried out, a mixture is transferred into a reaction kettle, hydrothermal reaction is carried out for 6-12 hours at the temperature of 100-150 DEG C, and then filtering, washing and drying are carried out. The main components of the material are amorphous silicon dioxide and hydroxyl aluminum oxide; the nitrogen adsorption specific surface area is 110 m < 2 >/g, the pore volume is 0.15 cm < 3 >/g, and the average pore size is 10-40 nm; under the environment temperature of 10-30 DEG C and the relative humidity of 95% and 85%, the maximum moisture absorption capacities respectively reach 25% and 20% or above; and under the environment temperature of 10-30 DEG C and the relative humidity of 45% and 35%, the maximum moisture liberation amount reachesmore than 15% and 10%, which are improved by more than 3 times compared with the diatomite, so that the material has a good application prospect.

Description

technical field [0001] The invention relates to a diatomite-based multi-level porous composite humidity-regulating material and a preparation method thereof, belonging to the field of deep processing of mineral materials and non-metallic mineral resources. Background technique [0002] With the improvement of people's living standards, people are increasingly pursuing a comfortable living environment. Humidity is an important indicator that affects indoor comfort and is related to people's health. Studies have shown that too high or too low humidity will have adverse effects on people's life, study and work. As the main means of adjusting the relative humidity of indoor air at present, mechanical humidity control equipment such as air conditioners and humidifiers consume a lot of electric energy, which does not meet the requirements of building a resource-saving and environment-friendly society. At present, building energy consumption accounts for a large proportion of my ...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/30
CPCB01J20/103B01J20/08B01J2220/4806B01J2220/4812
Inventor 胡志波李渝文兴青郭美羚徐丹张子浩
Owner SOUTHWEAT UNIV OF SCI & TECH
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