High-elasticity anti-radiation nanofiber aerogel material and preparation method thereof

A technology of nanofibers and nanofiber membranes, which is applied in the fields of fiber chemical characteristics, rayon manufacturing, textiles and papermaking, etc. It can solve the problems of insufficient heat insulation performance, poor radiation resistance performance, large thermal conductivity, etc., and achieve excellent radiation resistance Features, good high temperature insulation performance, good radiation resistance effect

Active Publication Date: 2021-12-24
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although nanofiber airgel solves the problem of elasticity, its thermal insulation performance is far behind that of traditional airgel materials.
Chinese patent application CN201910202661.5 discloses a method for preparing a modified silica powder/silica nanofiber composite airgel material, which consists of electrospun silica nanofibers and silica airgel powder The modified silica powder/silica nanofiber composite airgel material was prepared by combining the bulk phase, the compression rebound rate can reach 85%, and the uniform and stable dispersion of the nano-scale airgel powder improves the simple The heat insulation performance of nanofiber airgel, but the nanofibers in this patent application are pure s

Method used

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  • High-elasticity anti-radiation nanofiber aerogel material and preparation method thereof
  • High-elasticity anti-radiation nanofiber aerogel material and preparation method thereof
  • High-elasticity anti-radiation nanofiber aerogel material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] The present invention provides a preparation method of a high-elastic anti-radiation nanofiber gas gel material in a first aspect, the method comprising the steps of:

[0035] (1) Ethyl silicate (TEOS), phosphoric acid (H 3 PO 4 ) And water (e.g., deionized water) are mixed uniform, resulting in a mixed liquid, then stirring the mixture for 1 to 24 h (e.g., 1, 6, 12 or 24 h) to obtain a hydrolyzate, and then add titanium dioxide in the hydrolysis. Nanoflin and continued to be stirred for 1 to 12 hours (e.g., 1, 3, 6, 8, 10 or 12h), and finally chemically treated from 0.5 to 2 hours (e.g., 0.5, 1, 1.1.5 or 2h) to obtain a composite hydrolyzate (also recorded as TEOS). Composite hydrolyzing fluid); specifically, step (1) is: at room temperature, take a certain mass of TEOS, H 3 PO 4 And deionized water according to N (TEOS): N (h 3 PO 4 : N (h 2 O) = (0.5 ~ 1) :( 0.005 ~ 0.05): (1 to 20), preferably 1: (0.015 ~ 0.025): (8 to 15) more preferably 1: 0.02: 10 molar ratio mixed, ...

Example Embodiment

[0068] Example 1

[0069] ① Preparation of hybrid nanofiber membrane of

[0070] Preparation of Compound TEOS hydrolyzate: at room temperature and a TEOS (tetraethyl orthosilicate), H 3 PO 4 (Phosphoric acid) and deionized water according to n (TEOS): n (H 3 PO 4 ): N (H 2O) = 1: 0.02: 10 molar ratio is mixed, stirred on a magnetic stirrer for 12 hours to obtain a hydrolyzate; then add titanium dioxide nanoptripet with a titanium dioxide to a hydrolyzate to ensure that the titanium dioxide nanoptripets account for 2% of the mass of the hydrolyzate. The mixture was stirred for 1 h, so that the titanium dioxide nanopow was uniformly dispersed in the hydrolyzate to obtain a TEOS composite hydrolyzate.

[0071] Preparation of PVA aqueous solution: The polyvinyl alcohol powder was obtained into deionized water, and the mixture was dissolved at 80 ° C, stirred for 5 h; stirring was completed, stirred at a magnetic stirrer at room temperature until it was reduced to room temperature; The...

Example Embodiment

[0084] Example 2

[0085] Example 2 is basically the same as that of Example 1, and the difference is:

[0086] In step 1, the TEOS composite hydrolyzing is prepared: at room temperature, TEOS, H 3 PO 4 And deionized water according to N (TEOS): N (h 3 PO 4 : N (h 2 O) = 1: 0.02: 10 molar ratio is mixed, stirred on a magnetic agitator for 12 hours, resulting in a hydrolyzate; then adding titanium dioxide nanoptripets into the hydrolyzate to ensure that the titanium dioxide nanopowage is 1% of the quality of the hydrolyzate, The mixture was stirred for 6 h, so that the titanium dioxide nanowe was uniformly dispersed in the hydrolyzate to obtain a TEOS composite hydrolyzate.

[0087] The high-elastic anti-radiation nanofiber gas gel material in Example 2 performs performance test, as shown in Table 1.

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Abstract

The invention relates to a high-elasticity anti-radiation nanofiber aerogel material and a preparation method thereof. The method comprises the steps of mixing and stirring tetraethoxysilane, phosphoric acid and water evenly for 1-24 h, then adding titanium dioxide nano powder, continuing stirring for 1-12 h, and conducting ultrasonic treatment to obtain composite hydrolysate; uniformly mixing a polyvinyl alcohol aqueous solution and the composite hydrolysate with water, conducting stirring for 1-12 hours, and then carrying out electrostatic spinning on the precursor solution to obtain a hybrid nanofiber membrane; carrying out heat treatment on the hybrid nanofiber membrane; adding the hybrid nanofiber membrane subjected to heat treatment, tetraethoxysilane, boric acid and aluminum chloride into water, adding a graphene oxide solution, and conducting stirring at a high speed to obtain a homogeneous dispersion liquid; and then sequentially subjecting the homogeneous dispersion liquid to freezing, freeze drying and post-treatment processes, so as to prepare the high-elasticity anti-radiation nanofiber aerogel material. The material prepared by the invention has high elasticity and also has excellent radiation resistance, temperature resistance and high-temperature heat insulation performance.

Description

technical field [0001] The invention relates to the technical field of airgel preparation, in particular to a highly elastic anti-radiation nanofiber airgel material and a preparation method thereof. Background technique [0002] Nanoporous airgel (airgel for short) material is a kind of gel material whose dispersion medium is gas. It is a nanoporous solid material with a network structure composed of colloidal particles or polymer molecules. The size of the pores in the material is on the order of nanometers. Its porosity is as high as 80-99.8%, the typical size of the pores is 1-100nm, and the specific surface area is 200-1000m 2 / g, while the density can be as low as 3kg / m 3 , The thermal conductivity at room temperature can be as low as 0.012W / m·K. It is precisely because of these characteristics that airgel materials have broad application potential in thermal, acoustic, optical, microelectronics, and particle detection. At present, the most widely used field of aer...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L29/04C08K3/36C08K3/22C08K3/04D01F6/50D01F1/10D04H1/728D04H1/4309
CPCC08J9/28C08J9/0071C08J9/0066D01F6/50D01F1/10D04H1/728D04H1/4309C08J2329/04C08K3/36C08K2201/011C08K2003/2241C08K3/042C08J2201/0484C08J2205/026
Inventor 张恩爽李文静刘圆圆张昊黄红岩张凡
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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