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A preparation method of silica airgel ink for 3D direct writing printing

A silicon oxide airgel and ink technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of unfavorable low density, high porosity airgel materials, high solid content, and complexity, and achieve Good effect of maintaining solvent effect, reducing solvent volatilization loss and improving viscosity

Active Publication Date: 2022-06-24
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to add more organic substances to the ink, which is not suitable for the preparation of inorganic materials; Chinese patent CN110423515A discloses a magnesia ceramic ink for 3D direct writing molding and its preparation method. In this invention, 57-70wt% The solid content of ceramic powder magnesium oxide can make the printing ink exhibit good pseudoplasticity, but the solid content of the ink is too high, which is not conducive to the preparation of low-density, high-porosity airgel materials; [Nature, 2020, 584.7821 :387-392] reported a method for additive manufacturing of silica airgel, which uses micron-sized silica airgel powder as the main thickener, and controls the airgel powder in amyl alcohol-water solvent The ratio in the system prepares airgel ink with good pseudoplasticity. Although this method can realize the printing of silica airgel ink at room temperature, it needs to add a large amount of organic polyetheramine to realize the ink’s uniformity during the ink preparation process. Homogeneous phase stability, which makes the removal of organics complicated and difficult by media replacement during subsequent solvent replacement and supercritical drying

Method used

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  • A preparation method of silica airgel ink for 3D direct writing printing
  • A preparation method of silica airgel ink for 3D direct writing printing
  • A preparation method of silica airgel ink for 3D direct writing printing

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Embodiment 1

[0031] This embodiment provides a preparation method of silica aerogel ink for 3D direct writing printing (the operation process is as follows: figure 1 shown), which includes the following steps:

[0032] The first step, prepare defoaming polyvinyl alcohol solution, the method is:

[0033] In an airtight container, the polyvinyl alcohol solid particles are slowly stirred and dissolved in an ethanol-water solvent system under heating at 80° C. to obtain a defoaming polyvinyl alcohol solution with a solid content of 8 wt %. In the preparation process, the mass ratio of water and ethanol is controlled at 9:1;

[0034] The second step is to prepare a glue solution that can be used for gel curing by:

[0035]A defoaming polyvinyl alcohol solution, glycerol and water were added to the aqueous silica sol with a solid content of 40%, and the solution was slowly stirred for 15 minutes at room temperature to obtain a homogeneous, stable, gel-solidifying solution. In this process, th...

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Abstract

The invention discloses a silica airgel ink for 3D direct writing printing and a preparation method thereof. The ink is mainly composed of 5-18wt% nano-silica powder, 15-80wt% silica sol, 0-3wt% Polyvinyl alcohol, composed of 0-50wt% polyalcohol solvent and 0-67wt% water; its preparation process is: first prepare defoaming polyvinyl alcohol solution, then mix silica sol, polyvinyl alcohol solution, polyalcohol solvent and remove Ionized water is used to prepare a glue solution that can be used for gel curing, and finally the glue solution that can be used for gel curing is mixed with nano-silica powder, and the silica airgel ink that can be used for 3D direct writing printing is obtained through degassing; through this The silica airgel ink prepared by the method has good viscoelasticity, low room temperature volatility and printability, which will be beneficial to the additive manufacturing of silica airgel.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing of silicon oxide aerogel, in particular to a preparation method of silicon oxide aerogel ink for 3D direct writing printing. [0002] technical background [0003] The mesoporous silica aerogel prepared by the traditional sol-gel process has significant advantages such as low density, high porosity, high specific surface area, low dielectric constant and low thermal conductivity, and is currently the most widely studied and used. A type of aerogel. Among them, the low thermal conductivity of silica aerogel is particularly noticeable, and its excellent thermal insulation performance makes it show great economic value in the fields of industrial thermal insulation and civil thermal insulation, thus making the market of aerogel thermal insulation materials more attractive. The scale of possession is also expanding. [0004] However, the problem of brittleness is still the key to restr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/158C01B33/155C01B33/145B33Y70/10
CPCC01B33/1585C01B33/145C01B33/155B33Y70/10
Inventor 冯军宗冯坚王鲁凯姜勇刚李良军罗燚
Owner NAT UNIV OF DEFENSE TECH
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