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Clay composite drying agent and preparation method thereof

A composite drying and desiccant technology, applied in chemical instruments and methods, silicon compounds, other chemical processes, etc., can solve the problems of many components and complex processes, and achieve the effects of low preparation cost, simple process and fast adsorption speed.

Inactive Publication Date: 2010-03-31
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent 200510038164.4 discloses a desiccant for preventing insects and mildew of grain and its production method. Composed of fennel, acidified, milled, granulated, roasted and dried, mixed and packaged as a finished product, but the composition has many ingredients and complicated processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add a certain amount of 1% acetic acid solution in a 250-liter reactor, then add 5 kg of chitosan with a molecular weight of 100,000 and a degree of deacetylation of 90%, stir and dissolve at room temperature, then add 75 kg of attapulgite clay and After continuing to stir 20 kg of montmorillonite for 4 hours, put it into 5% sodium hydroxide solution and continue stirring for 30 minutes, filter and dry to obtain a granular clay-based composite desiccant. The test and use results show that the desiccant produced by this method has a static moisture absorption rate of 50-90% at a relative humidity of 60%. The antibacterial effect on Bacillus subtilis, Staphylococcus aureus, Streptococcus and Escherichia coli is better than that of sodium benzoate.

Embodiment 2

[0020] Add a certain amount of 1% acetic acid solution in a 250-liter reactor, then add 8 kg of chitosan with a molecular weight of 50,000 and a deacetylation degree of 83%, stir and dissolve at room temperature, and then add 80 kg of 2mol / L acid for treatment Attapulgite clay and 12 kg of rectorite were continuously stirred for 4 hours, then put into 5% sodium hydroxide solution and continued to stir for 30 minutes, filtered and dried to obtain a granular clay-based composite desiccant. The test and application results show that the desiccant produced by this method has a static moisture absorption rate of 65-90% at a relative humidity of 60%. The antibacterial effect on Bacillus subtilis, Staphylococcus aureus, Streptococcus and Escherichia coli is better than that of sodium benzoate.

Embodiment 3

[0022] Add a certain amount of 1% acetic acid solution in a 250-liter reactor, then add 5 kg of carboxymethyl chitosan with a molecular weight of 80,000 and a degree of substitution of 0.25, stir and dissolve at room temperature, then add 70 kg of mica and 25 kg of After the attapulgite clay treated with 12mol / L acid was stirred for 4 hours, it was put into 5% sodium hydroxide solution and stirred for 30 minutes, filtered and dried to obtain a granular clay-based composite desiccant. The test and application results show that the desiccant produced by this method has a static moisture absorption rate of 70-110% at a relative humidity of 60%. The antibacterial effect on Bacillus subtilis, Staphylococcus aureus, Streptococcus and Escherichia coli is better than that of sodium benzoate.

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Abstract

The invention discloses a clay composite drying agent and a preparation method thereof. The drying agent mainly comprises clay and chitosan. The drying agent has the characteristics of high adsorptionrate, high absorption capacity, no toxicity, no taste, non-contact corrosion, bacteriostasis and the like, is low in preparation cost and simple in process, and is applicable to various occasions needing the drying agent. Because of no expansion or pulverization after moisture absorption, the drying agent can be repeatedly reused after being dried.

Description

technical field [0001] The invention relates to a composite desiccant and a preparation method thereof. Specifically, the present invention relates to a clay composite desiccant with the characteristics of fast adsorption speed, high adsorption capacity, non-toxic, tasteless, non-contact corrosion and bacteriostasis and its preparation method. Background technique [0002] Using the desiccant to absorb the moisture in the items can keep the items relatively dry for a long time, so as to achieve the purpose of moisture-proof, mildew-proof, insect-proof, rust-proof, anti-oxidation and prolong the product shelf life. However, the desiccants used in the past, such as silica gel desiccant and calcium chloride desiccant, have their own shortcomings. Silica gel desiccant is a physical water absorption method. When the moisture content in the article and the air is lower than that of the desiccant, the phenomenon of reverse adsorption of moisture will occur. The adsorption capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/24
Inventor 王爱勤汪琴
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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