Preparation method for compound porous mineral humidifying materials with excellent moisture absorption performance

Abstract

The invention discloses a preparation method for compound porous mineral humidifying materials with excellent moisture absorption performance. On the basis of the mixing expanded perlite and activatedsepiolite, calcium chloride is taken as modifier; after mixed materials are subjected to impregnation modification, drying is carried out. The sepiolite subjected to modified treatment by acid has alarge specific surface area and total pore volume, and therefore, the sepiolite has better moisture absorption and initial moisture absorption rate in a low moisture range; in a high moisture range, the capillary condensation amount of the expanded perlite with a large aperture is greater than the capillary condensation amount of the sepiolite. The prepared compound humidifying material has good moisture absorption performance under various moisture environments, in addition, calcium chloride which is deposited on the surface of the porous mineral can generate hydration reaction with vapour, and physical absorption and chemical adsorption in the humidifying materials are mutually accelerated so as to improve the moisture adsorption amount of the humidifying materials.

Description

technical field [0001] The invention relates to the preparation of a self-humidity-regulating material, in particular to a method for preparing a composite porous mineral humidity-regulating material with excellent hygroscopic performance. Background technique [0002] Air humidity is an important environmental parameter closely related to people's life and production, and it has attracted people's attention day by day. Excessive humidity in the air can cause discomfort such as dampness and chest tightness, induce arthritis and other diseases, cause metal surface corrosion, lead to a decrease in electrical insulation performance, and affect the production and quality of mechanical parts. However, if the air temperature is too low, it will cause skin allergies, dry eyes and nose, cause respiratory infection and asthma and other diseases to invade, and also cause static electricity. The use of humidity-regulating materials can rely on its own moisture absorption and desorptio...

AI Technical Summary

Problems solved by technology

[0003] At present, composite materials with humidity control function are mainly divided into five categories: first, special silica gel, which has outstanding moisture absorption capacity and moisture absorption speed, but the analysis process presents a more serious hysteresis than moisture absorption; second, inorganic salts, with With the increase of moisture absorption, it will slowly deliquify itself; third, organic polymer materials, the moisture absorption and desorption speed are affected by the expansion speed of polymer, so the manufacturing cost is high and the functional life is short; fourth, the organic-inorganic composite humidity control function Composite materials increase the moisture absorption and desorption rate and speed, but the manufacturing cost is higher; fifth, porous inorganic materials, including bamboo charcoal, activated carbon, zeolite, sepiolite, etc. The hysteresis is small, non-toxic and harmless to the human body and the environment, but when a single porous inorganic material acts alone, it needs to add a variety of admixtures to achieve the desired effect