Preparation method for silicon dioxide humidity regulating material

A technology of humidity control material and silicon dioxide, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of high humidity and energy consumption, and achieve the effects of simple equipment, easy industrialization, and convenient reuse.

Inactive Publication Date: 2015-03-11
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The machinery for adjusting humidity mainly includes dehumidifiers, humidifiers, and constant humidity air conditioners. The advantage of this method is high efficiency, but the disadvantage is that it consumes a lot of energy to adjust humidity continuously when it is turned on 24 hours a day; non-mechanical adjustment mainly refers to the use of humidity adjustment. The moisture absorption and desorption properties of the material can independently and adaptively adjust the environmental humidity. This method does not require any mechanical equipment and energy consumption, and is an environmentally friendly control and adjustment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: adopt following steps:

[0014] A) According to the mass fraction, take 5 parts of polyacrylic acid with a relative molecular mass of 25,000 and 37 parts of a 60% dilute nitric acid solution in 100 parts of deionized water;

[0015] B) Take 60 parts of sodium silicate in the solution prepared in step A) according to the mass fraction, and fully stir until the sodium silicate is completely dissolved;

[0016] C) Place the homogeneous solution obtained in step B) in a closed plastic container, and let it gel in an oven at 25°C for 24 hours;

[0017] D) Fully wash the wet gel obtained in step C) with distilled water, and then dry it in a vacuum oven at 50°C for 30 minutes;

[0018] E) Aging the gel obtained in step D) in 0.1mol / L ammonia solution at 50°C for 72h;

[0019] F) The obtained xerogel was calcined in a muffle furnace at 700°C for 2 hours to obtain silica with a bimodal structure.

Embodiment 2

[0020] Embodiment 2: adopt following steps:

[0021] A) According to the mass fraction, take 8 parts of polyacrylic acid with a relative molecular mass of 25,000 and 37 parts of a 60% dilute nitric acid solution in 100 parts of deionized water;

[0022] B) Take 50 parts of sodium silicate in the solution prepared in step A) according to the mass fraction, and fully stir until the sodium silicate is completely dissolved;

[0023] C) Place the homogeneous solution obtained in step B) in a closed plastic container, and let it gel in an oven at 25°C for 24 hours;

[0024] D) Fully wash the wet gel obtained in step C) with distilled water, and then dry it in a vacuum oven at 50°C for 30 minutes;

[0025] E) Aging the gel obtained in step D) in 0.1mol / L ammonia solution at 80°C for 72h;

[0026] F) The obtained xerogel was calcined in a muffle furnace at 700°C for 2 hours to obtain silica with a bimodal structure.

Embodiment 3

[0027] Embodiment 3: adopt following steps:

[0028] A) According to the mass fraction, take 6.5 parts of polyacrylic acid with a relative molecular mass of 25000 and 37 parts of a 60% dilute nitric acid solution in 100 parts of deionized water;

[0029] B) Take 55 parts of sodium silicate in the solution prepared in step A) according to the mass fraction, and fully stir until the sodium silicate is completely dissolved;

[0030] C) Place the homogeneous solution obtained in step B) in a closed plastic container, and let it gel in an oven at 25°C for 24 hours;

[0031] D) Fully wash the wet gel obtained in step C) with distilled water, and then dry it in a vacuum oven at 50°C for 30 minutes;

[0032] E) Aging the gel obtained in step D) in 0.1mol / L ammonia solution at 65°C for 72h;

[0033] F) The obtained xerogel was calcined in a muffle furnace at 700°C for 2 hours to obtain silica with a bimodal structure.

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PUM

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Abstract

The invention discloses a preparation method for a silicon dioxide humidity regulating material. Sodium silicate, polyacrylic acid, dilute nitric acid, deionized water and other raw materials are synthesized to compound the functional humidity regulating material. A mesoporous material is adopted as the skeleton, on the basis, polyacrylic acid is added and a phase separation technique is utilized to introduce large pore channels to the skeleton of the mesoporous material, thus further improving the humidity regulating performance of silicon dioxide. Compared with existing humidity regulating materials, the silicon dioxide humidity regulating material provided by the invention has the advantages of: 1) fast moisture absorption and desorption response speed, efficient and rapid regulation of microenvironment relative humidity; 2) convenient regeneration and reuse; 3) cheap and abundant silicon source sodium silicate; 4) simple production process and equipment, and easy industrialization; and 5) no generation of harmful substances in the production process.

Description

technical field [0001] The invention belongs to the field of humidity control materials, in particular to a method for preparing a silicon dioxide humidity control material with bimodal hole structure. Background technique [0002] Humidity is an environmental parameter closely related to people's life and production. It is of great significance to human comfort, product production process and quality, and item preservation. Especially for cultural relics, medicines, etc., the damage caused by fluctuations in the relative humidity of the environment is great. High humidity environments often cause mildew and decay, while low humidity environments make materials brittle and broken. Generally speaking, a relative humidity of 40-65% is more beneficial to both people and objects, while the annual average relative humidity in most southern regions of my country is 70-80%, sometimes as high as 95-100%. Relative humidity can even reach below 10%, so humidity regulation is extremely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 冯道言苑宏伟彭志勤
Owner ZHEJIANG SCI-TECH UNIV
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