Drying agent and preparation method thereof

Abstract

The invention discloses a drying agent and a preparation method thereof, the drying agent is mainly composed of magnesium oxide and magnesium chloride, and the drying agent comprises the following components in parts by weight: 1090 parts of magnesium oxide with high magnesium oxide content, magnesium hydroxide, magnesium carbonate or a mixture of one or more of the magnesium oxide, the magnesiumhydroxide and the magnesium carbonate; 5-90 parts of anhydrous magnesium chloride with high magnesium chloride content or / and magnesium chloride with N crystal waters; aluminum oxide and / or clay, lignin and / or molecular sieve raw powder, glass fibers, carboxymethyl cellulose and the like are added, stirring and mixing, granulation, screening, drying and roasting are sequentially carried out, and the prepared drying agent is granular and extremely good in moisture absorption effect and still appears in a granular block shape after moisture absorption.

Description

technical field [0001] The invention relates to a desiccant and a preparation method of the desiccant. Background technique [0002] The desiccant came into being in order to avoid the occurrence of defective products caused by excess moisture. The types of desiccants are divided into physical adsorption desiccants and chemical adsorption desiccants according to their drying principles. The physical adsorption desiccant takes molecular sieve as an example, which absorbs water through physical means, such as using the numerous micropores inside the desiccant particles; the chemical adsorption desiccant takes calcium oxide as an example, which generates stable hydrogen by combining with water Calcium oxide to achieve its drying effect. [0003] Desiccant is widely used, and it is suitable for various industries such as instruments, meters, electrical equipment, medicines, food, textiles and other packaging items. According to their own environmental requirements, various in...

AI Technical Summary

Problems solved by technology

According to their own environmental requirements, various industries will put forward different requirements for performance and form of desiccants. For example, in the field of surveillance cameras, due to the existence of water vapor inside the camera and changes in temperature, it is easy to cause lens "fogging" phenomenon , resulting in blurred images, so the moisture-proof work of the surveillance camera lens is an important part of its product quality rate, which also makes the desiccant have a high moisture absorption effect, and it is difficult for general desiccants to meet the requirements; During use, there is a risk of colliding with the sharp corners of electronic components and causing holes. It is required that the desiccant should be in a granular state before and after moisture absorption, and it will not affect the equipment during use.

However, the existing desiccants such as molecular sieves and calcium oxide have low hygroscopic performance, and it is difficult to meet the requirements of some equipment. At the same time, magnesium oxide / magnesium chloride desiccants with high hygroscopic performance are powder before and after moisture absorption. It is easy to affect the equipment and has a great potential safety hazard

To sum up, the existing desiccants have the defects of low hygroscopic performance or powder state, which cannot meet the needs of some equipment and products with high requirements. Therefore, it is necessary to develop a new type of desiccant to solve the hygroscopic effect of the desiccant. And the use safety of the powder state before and after the desiccant absorbs moisture