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Drying agent for precision optical instrument and preparation method of drying agent

A technology of precision optics and desiccant, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve problems such as gaps, and achieve the effects of long efficacy period, avoidance of mildew, and excellent water absorption and water retention performance.

Pending Publication Date: 2022-06-17
HANGZHOU GANJIANG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, precision optical instruments used in low-temperature and low-humidity environments (temperature ≤ 14°C, humidity < 3.99g / kg) have strict requirements for desiccants, and put forward higher requirements for heat release and dimensional changes after moisture absorption, but the existing silica gel There is still a certain gap in the desiccant. At present, the development of a silica gel desiccant with excellent comprehensive performance, especially high hygroscopicity, has attracted extensive attention from researchers.

Method used

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  • Drying agent for precision optical instrument and preparation method of drying agent
  • Drying agent for precision optical instrument and preparation method of drying agent

Examples

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Embodiment 1

[0036] A preparation method of a desiccant for precision optical instruments, comprising the following steps:

[0037] S1. Add 1kg of ammonium acrylate to 20kg of water, add 0.1kg of N,N'-methylenebisacrylamide under stirring, heat up to 40°C under stirring, add 5kg of macroporous silica gel to it, ultrasonically treat it for 1h, and ultrasonically The frequency was 20 kHz, the ultrasonic power was 400 W, the temperature was raised to 60 °C, 0.1 kg of ammonium persulfate was added, stirred at a speed of 10000 r / min for 5 min, cooled to room temperature, stirred at a speed of 1000 r / min for 1 h, dried at 80 °C to constant weight, Pulverized to obtain silica gel composite;

[0038] S2, 2kg calcium nitrate is dissolved in 10kg ethanol, it is 0.1mol / L glycine aqueous solution to wherein dripping 5kg concentration under stirring state, add 1kg tetraethyl orthosilicate to wherein after dripping completely, adopt concentrated hydrochloric acid to regulate system pH to be 2-3, Evapor...

Embodiment 2

[0041] A preparation method of a desiccant for precision optical instruments, comprising the following steps:

[0042]S1. Add 4kg of ammonium acrylate to 40kg of water, add 0.15kg of N,N'-methylenebisacrylamide under stirring, heat up to 50°C under stirring, add 10kg of macroporous silica gel to it, ultrasonically treat it for 2h, and ultrasonically The frequency is 30kHz, the ultrasonic power is 600W, the temperature is raised to 70°C, 0.12kg of ammonium persulfate is added, stirred at a speed of 12000r / min for 10min, lowered to room temperature, stirred at a speed of 1200r / min for 2h, dried at 90°C to constant weight, Pulverized to obtain silica gel composite;

[0043] S2, 8kg calcium nitrate is dissolved in 20kg ethanol, dripping 10kg concentration wherein is 1mol / L glycine aqueous solution under agitation, add 2kg ethyl orthosilicate to wherein after dripping completely, adopt concentrated hydrochloric acid to regulate system pH to be 2 -3, Evaporate and concentrate at 70...

Embodiment 3

[0046] A preparation method of a desiccant for precision optical instruments, comprising the following steps:

[0047] S1, add 2kg of ammonium acrylate to 35kg of water, add 0.11kg of N,N'-methylenebisacrylamide under agitation, heat up to 48°C under agitation, add 6kg of macroporous silica gel to it, ultrasonically treat it for 110min, and ultrasonically The frequency is 24kHz, the ultrasonic power is 550W, the temperature is raised to 62°C, 0.115kg of ammonium persulfate is added, stirred at a speed of 10500r / min for 8min, cooled to room temperature, stirred at a speed of 1050r / min for 1.7h, and dried at 82°C to constant weight , pulverized to obtain silica gel composite;

[0048] S2, 6kg calcium nitrate is dissolved in 12kg ethanol, dripping 8kg concentration wherein is 0.2mol / L glycine aqueous solution under agitation, add 1.7kg ethyl orthosilicate to wherein after dripping completely, adopt concentrated hydrochloric acid to adjust system pH For 2-3, 64°C evaporated and c...

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Abstract

The invention discloses a drying agent for a precise optical instrument. The invention discloses a preparation method of the drying agent for the precise optical instrument, which comprises the following steps: cross-linking ammonium acrylate and macroporous silica gel, so that the inner and outer surfaces of the through holes of the macroporous silica gel are coated with polyacrylamide to obtain a silica gel compound; the preparation method comprises the following steps: mixing and dissolving calcium nitrate and glycine, adding tetraethoxysilane, heating and reacting under an acidic condition, drying and roasting to obtain calcium oxide with high specific surface area, and the mass ratio of calcium nitrate to a glycine aqueous solution to tetraethoxysilane is (2-8): (5-10): (1-2); a silica gel compound, high-specific-surface-area calcium oxide, bentonite, attapulgite and aluminum oxide are evenly mixed, compression molding is conducted, vacuum drying is conducted till the weight is constant, cooling is conducted, and the drying agent for the precision optical instrument is obtained. The mass ratio of the silica gel compound to the high-specific-surface-area calcium oxide to the bentonite to the attapulgite to the aluminum oxide is (8-16): (6-12): (1-5): (1-5): (1-2).

Description

technical field [0001] The invention relates to the technical field of desiccants, in particular to a desiccant for precision optical instruments and a preparation method thereof. Background technique [0002] Optical instruments are conventional instruments in physical experiments, such as lasers, microscopes, telescopes, etc. Their structures are precise and expensive. If they are improperly used and stored, they are prone to failure. Among them, it is most likely to cause mold and fog in the optical system due to humidity. Mold and fog are the most harmful to the optical system. These two hazards directly affect the quality and service life of optical instruments and affect the experimental results. Eventually, optical instruments lose their use value due to the reproduction of mold or the corrosion of fog traces. Therefore, the drying of optical instruments is very important. [0003] Desiccant, also known as adsorbent, uses its good dehumidification ability to absorb ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30B01D53/28
CPCB01J20/267B01J20/041B01J20/12B01J20/08B01D53/28
Inventor 吴方平郭贺影胡毓龙
Owner HANGZHOU GANJIANG IND
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