A kind of diatomite/white carbon black composite humidity control material and preparation method thereof

Abstract

The invention relates to a diatomaceous earth / white carbon black composite humidity controlling material and a preparation method thereof. The preparation method comprises the following steps: first, preparing mixed ore pulp of sodium silicate and diatomaceous by taking diatomaceous earth as a silicon source and adopting a partial alkali dissolution-acid precipitation method; adding 40 to 60 mass percent of sulphuric acid solution into the mixed ore pulp; performing acid precipitation on the sodium silicate to generate precipitated white carbon black; then, aging for 20 to 40 minutes, filtering, washing and drying. The main component of the composite humidity controlling material is amorphous silicon dioxide; the nitrogen adsorption specific surface area is greater than or equal to 150 m<2> / g; the pore volume is greater than or equal to 0.20 cm<3> / g; the average pore diameter is 10 to 30 nm; the maximum humidity adsorbing amounts respectively reach 30 percent and 25 percent or higher under the relative humidity of 90 percent and 80 percent at the ambient temperature of 30 DEG C; the maximum humidity releasing amounts respectively reach 20 percent and 15 percent or higher under the relative humidity of 65 percent and 55 percent at the ambient temperature of 30 DEG C. The maximum humidity adsorbing amounts and the maximum humidity releasing amounts of the diatomaceous earth / white carbon black composite humidity controlling material are improved by 5 times or more when being compared with those of pure diatomaceous earth; the diatomaceous earth / white carbon black composite humidity controlling material has a good application prospect.

Description

Technical field

[0001] The invention relates to a diatomite / white carbon black composite humidity control material and a preparation method thereof, belonging to the field of mineral materials and non-metal deep processing. Background technique

[0002] Humidity is one of the important indicators for evaluating indoor air environment. Too high humidity can cause mold growth, accelerate the corrosion of the equipment, and shorten the service life of the equipment. Too low humidity can cause problems such as human skin cracks, respiratory diseases, and furniture deformation and cracking. At present, people mainly use humidifiers and air conditioners to adjust the relative humidity of indoor air. Mechanical humidity control means consume a lot of energy. Humidity control materials use the moisture absorption and release characteristics of materials to reasonably regulate indoor humidity, without consuming non-renewable energy such as electricity, and meet the needs of energy conse...

Images