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

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 ...

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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 instruments and equipment. Weak oxalic acid is used as raw material for acid precipitation, and a diatomite-based hierarchical porous composite moisture-controlling material with strong moisture absorption and desorption capacity and reasonable pore structure distribution is prepared by partial alkali dissolution-hydrothermal molding

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