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Material with low humidity sensitivity and high saturation water absorption and preparation method thereof

A sensitivity and water absorption technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of adsorption loss, limitation, low saturated water absorption of molecular sieve materials, etc., and achieve the effect of high thermal stability

Active Publication Date: 2022-04-12
GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the saturated water absorption of molecular sieve materials is low (about 23wt%), so it needs to be replaced regularly during use, and its application in a closed environment with complex structures is limited to a certain extent.
In addition, since the adsorption of molecular sieves is related to the molecular size, the adsorption of water vapor and other gases such as CO 2 Non-directional adsorption may occur when coexisting (the saturated carbon dioxide adsorption capacity of commercial 13X molecular sieve is about 17.5wt%), which will cause the loss of adsorption capacity on the one hand, and destroy the atmosphere composition in the environment on the other hand

Method used

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  • Material with low humidity sensitivity and high saturation water absorption and preparation method thereof
  • Material with low humidity sensitivity and high saturation water absorption and preparation method thereof
  • Material with low humidity sensitivity and high saturation water absorption and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Hydroxy-terminated polysiloxane preparation

[0054] Measure 50ml of dimethyldichlorosilane into a 500ml round-bottomed flask, add 150ml of ether, stir, cool in an ice bath to 4°C, add 50ml of 1M hydrochloric acid solution dropwise into the flask while stirring, and continue the reaction for 2 hours after the addition is complete. Then let it stand for layering. The organic layer was washed successively with saturated sodium bicarbonate and deionized water, and then dried with anhydrous sodium sulfate, diethyl ether was distilled off under reduced pressure to obtain a colorless transparent clear liquid. Adopt the method test of Gel Permeation Chromatography, monodisperse PDMS is that standard product is calculated and shows that the molecular weight of product is about 2.5KDa (chromatogram such as figure 1 shown).

[0055] Absorbent material preparation

[0056] Weigh 1.0 g of hydroxyl-terminated polydimethylsiloxane (M n ~2.5KDa) in a 100ml beaker, add 20ml of ethy...

Embodiment 2

[0061] Weigh 1.0g of p-1,4-bis(hydroxydimethylsilyl)benzene into a 100ml beaker, add 20ml of ethyl acetate to dissolve to obtain an ethyl acetate solution; take another beaker, weigh 12g of 400 mesh Diboron trioxide, slowly add the ethyl acetate solution into diboron trioxide under stirring, keep the reaction temperature of the system at 100°C, after the reaction is finished, volatilize the ethyl acetate and dehydrate under vacuum at 120°C to obtain The white powder has a water absorption of 63.2wt% when placed at room temperature at a relative humidity of 68% for 3 hours; and a water absorption of 64.5% after being placed at room temperature at a relative humidity of 4% for two months.

[0062] The thermogravimetric loss of the saturated sample in a nitrogen atmosphere shows that the weight loss temperature of the sample is greater than 80°C (such as Figure 4 shown).

Embodiment 3

[0064] Take by weighing 1.0g hydroxyl end-capped MQ resin (hydroxyl content 5wt%), add in the 250ml ball mill jar, then add 21g boric acid in the ball mill jar, and ball mill 24h, keep system reaction temperature at 160 ℃, after the completion of the reaction, put The product was passed through a 200-mesh sieve and dehydrated under vacuum. The water absorption of the obtained white solid was 62.2wt% when placed at room temperature for 3 hours at a relative humidity of 68%, and 61.8% after being placed at room temperature for two months at a relative humidity of 4%.

[0065] The thermogravimetric loss of the saturated sample in a nitrogen atmosphere shows that the weight loss temperature of the sample is greater than 80°C (such as Figure 5 shown).

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Abstract

The invention provides a material with low humidity sensitivity and high saturation water absorption capacity and a preparation method thereof, and relates to the technical field of water absorption material preparation. Hydroxyl siloxane and a boron-containing compound mixture react to prepare the low-humidity sensitive high-water-absorption material, and the hydroxyl siloxane is selected from any one of a hydroxyalkyl-containing compound, a silanol structure-containing compound and a hydroxyalkyl-containing and silanol-containing polymer, and the boron-containing compound is selected from a boron-containing compound, a boron-containing compound, a boron-containing compound, a boron-containing compound, a boron-containing compound, a boron-containing compound and a boron-containing compound. The boron-containing compound is selected from any one or more of boric acid, boric anhydride and boric acid ester; the prepared water absorption material has good moisture absorption activity in a low-humidity environment, the saturated water absorption capacity is larger than 55 wt% in an environment with the relative humidity being 4%, meanwhile, the dehydration temperature of a saturated material adsorbing water is larger than 80 DEG C in dry nitrogen, and the water absorption material has high thermal stability.

Description

technical field [0001] The invention relates to the technical field of preparation of water-absorbing materials, in particular to a material with low humidity sensitivity and high saturated water absorption and a preparation method thereof. Background technique [0002] Due to the conductivity and chemical reactivity of water, it is necessary to control the humidity in the environment in many fields such as the battery industry and the chemical industry to prolong the service life of materials and devices. In the field of chemical industry, many alkali metals, alkaline earth metals, transition metals and their compounds can react with water, among which hydrides generate hydrogen gas due to the reaction, and hydrogen gas is flammable and explosive, thus posing a serious safety threat. Molecular sieves with various structures are currently widely used dehumidification materials. Commercial molecular sieves have high low humidity sensitivity and can be used at low humidity (RH...

Claims

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Application Information

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IPC IPC(8): C08G77/398C08G77/16B01J20/26B01J20/30
Inventor 邢涛衣志勇陈柯全李保强何韧吴菊英
Owner GENERAL ENG RES INST CHINA ACAD OF ENG PHYSICS
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