Preparation method of monodispersed mesoporous silica, and nano-composite foaming agent as well as preparation method and application thereof

A mesoporous silica and nanocomposite technology, applied in the direction of silica, silica, etc., can solve the problem that the foaming efficiency and quality need to be further improved, the nucleation point of the composite foaming agent needs to be improved, and the cell size is difficult to control. and other problems, to achieve the effect of small cells, excellent dispersion, and good foaming quality.

Active Publication Date: 2017-08-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention is: although the existing composite foaming agent can solve the problem that the cell size is difficult to control to a certain extent, the current foaming agent The composite effect still needs to be improved, the nucleation point on the composite blowing agent still needs to be improved, and the foaming efficiency and quality need to be further improved

Method used

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  • Preparation method of monodispersed mesoporous silica, and nano-composite foaming agent as well as preparation method and application thereof
  • Preparation method of monodispersed mesoporous silica, and nano-composite foaming agent as well as preparation method and application thereof
  • Preparation method of monodispersed mesoporous silica, and nano-composite foaming agent as well as preparation method and application thereof

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preparation example Construction

[0101] Preparation of mesoporous silica:

[0102] The mesoporous silica was obtained by polymerization-induced colloidal coagulation method, and the elemental silicon powder was activated by immersing in hot water at 70°C for 10 minutes, and then centrifuged to obtain activated elemental silicon powder. Then add 200g of sodium hydroxide solution with a mass concentration of 0.5% into a three-necked flask, heat it to 60-80°C, add activated silicon powder, stir and react for 12-24h, then separate the reaction mixture, and the separated solution is It is the primary particle of silica sol. The primary particles of the obtained silica sol are used as the mother liquor, and the same steps as the preparation of primary particles are adopted to obtain silica sols with different particle sizes by supplementing silicon powder and 0.5% sodium hydroxide solution by mass fraction. Supplementary silicon powder and sodium hydroxide solution consumption and the corresponding raw material el...

Embodiment 1

[0115] The preparation of embodiment 1 silica sol (primary particle)

[0116] Add 200g of sodium hydroxide solution with a concentration of 0.5% into a three-necked flask, heat it to 70°C, add 21g of activated silicon powder, stir and react for 12 hours, and centrifuge the reaction mixture. The separated solution is the primary particle of silica sol Silica sol, its mass concentration is 10%.

[0117] Depend on Figure 1-a As shown, the primary particle size of silica sol is 15nm.

Embodiment 2

[0118] The preparation of embodiment 2 silica sol (embodiment 1 silica sol carries out 2 times of silicon replenishment)

[0119] The silica sol obtained in Example 1 was used as the mother liquor, and 50 mL of the mother liquor was taken, and 5.25 g of elemental silicon powder after activation and 50 g of sodium hydroxide solution with a mass fraction of 0.5% were added to it for the first time, heated to 70°C, and stirred for 12 hours. Afterwards, the reaction mixture was centrifuged to obtain silica sol. Using this silica sol as the mother liquor, add 11.5g of elemental silicon powder after activation and 100g of sodium hydroxide solution with a mass fraction of 0.5% to it for the second time, heat to 70°C, stir and react for 12 hours, and then centrifuge the reaction mixture to obtain silicon Sol, its mass concentration is: 20%.

[0120] Depend on Figure 1-b As shown, the primary particle size of silica sol is 25nm.

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Abstract

The invention provides a preparation method of monodispersed mesoporous silica, and a nano-composite foaming agent as well as a preparation method and application thereof. The preparation method of the monodispersed mesoporous silica comprises the steps of preparing silica sol by taking monatomic silicon powder as a silicon source, adjusting the particle sizes of the silica sol by supplementing silica powder and a sodium hydroxide solution, synthesizing the silica sol into urea formaldehyde resin / SiO2 composite microspheres by using a polymerization-induced colloid aggregation method, and calcining to obtain the monodispersed mesoporous silica. The nano-composite foaming agent is prepared by compounding the monodispersed mesoporous silica and azodicarbonamide. The composite foaming agent prepared by the method not only is small in particle size, and is high in loading amount of a chemical foaming agent, thus being used for preparing microcellular foam plastics with better foaming quality and having wide application prospect.

Description

technical field [0001] The invention relates to the field of foaming agents, mainly to the field of nano-composite foaming agents, and in particular to composite foaming agents, foaming products and their preparation methods and applications. Background technique [0002] Silica microspheres are widely used in chromatographic column fillers, coatings and catalysts due to their high mechanical strength, good stability and easy dispersion in solvents. At the same time, silica microspheres also have the advantages of non-toxicity, hydrophilicity, and easy functionalization of surface hydroxyl groups, which have potential application values ​​in the fields of biological detection and medicine. Porous silica microspheres with uniform particle size and easy control of pore size are the most commonly used carrier materials in nano-mesoporous composite materials. [0003] Microcellular foam means that the cell size is 0.1-10μm, and the cell density is concentrated at 10 9 -10 15 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/10C08J9/00C08L63/00C01B33/12
CPCC01B33/12C08J9/0066C08J9/103C08L63/00C01P2004/04C01P2004/03C01P2004/61C01P2006/14C01P2006/16C01P2006/17C08L2203/14C08J2363/00C08J2203/04C08J2205/044
Inventor 郭灿雄梅莉
Owner BEIJING UNIV OF CHEM TECH
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