Phenolic resin aerogel with nanofiber network structure, carbon aerogel material and preparation method of phenolic resin aerogel

A phenolic resin and nanofiber technology is applied in the field of phenolic resin aerogel and carbon aerogel materials and their preparation, which can solve the problems of high material density and limitation, and achieve the effects of low density, low cost and convenient preparation.

Active Publication Date: 2018-08-24
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The phenolic resin airgel obtained by the above method has certain elasticity, but the density of the obtained airgel material is 132~172mg / cm 3 Among them, there are problems such as high material density, which greatly limits its practical application

Method used

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  • Phenolic resin aerogel with nanofiber network structure, carbon aerogel material and preparation method of phenolic resin aerogel
  • Phenolic resin aerogel with nanofiber network structure, carbon aerogel material and preparation method of phenolic resin aerogel
  • Phenolic resin aerogel with nanofiber network structure, carbon aerogel material and preparation method of phenolic resin aerogel

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preparation example Construction

[0049] The invention provides a method for preparing a phenolic resin airgel with a nanofiber network structure, comprising the following steps:

[0050] S1. Dispersing one-dimensional nanomaterials, surfactants, catalysts, phenolic compounds and aldehyde compounds in a solvent to form a sol;

[0051] The one-dimensional nanomaterial is selected from tellurium nanowires, cellulose nanofibers, carbon nanotubes, silver nanowires, calcium silicate nanowires, vanadium oxide nanowires, aluminum oxide nanowires, protein nanofibers and chitin nanofibers at least one of;

[0052] S2, heating the sol to obtain a phenolic resin hydrogel;

[0053] S3, performing supercritical drying on the phenolic resin hydrogel to obtain a phenolic resin airgel having a nanofiber network structure.

[0054]The phenolic resin airgel material prepared by the invention has excellent mechanical properties and low density. Moreover, the preparation method provided by the invention has a simple and contro...

Embodiment 1

[0078] The present embodiment phenolic resin nanofiber airgel and carbon nanofiber airgel are carried out as follows:

[0079] a. Disperse 0.922 g of sodium tellurite (Mayer Reagent) and 10 g of polyvinylpyrrolidone (Sinopharm Chemical Reagent Co., Ltd.) in 330 mL of deionized water, and stir for 1 hour. Then add 33.5mL of ammonia water and 16.5mL of hydrazine hydrate in sequence, stir evenly, put it into a 500mL polytetrafluoroethylene-lined hydrothermal reaction kettle, place it in an oven at 180°C, and conduct a hydrothermal reaction for 3 hours to obtain a tellurium nanowire dispersion.

[0080] The transmission electron microscope pictures of the obtained tellurium nanowires are as follows: figure 1 Shown; its diameter is 6 ~ 8nm, the length is hundreds of nanometers to tens of microns.

[0081]b. Take 10 mL of the tellurium nanowire dispersion into a centrifuge tube, add acetone to settle, separate the precipitate, add 10 mL of ethylene glycol, shake vigorously to dispe...

Embodiment 2～3

[0087] The phenolic resin nanofiber airgel material was prepared according to the method of Example 1, the only difference being that the amount of tellurium nanowire dispersion liquid added was different, which were 20mL and 30mL in turn. All the rest are the same, including the amount of resin, catalyst, solvent.

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Abstract

The invention provides phenolic resin aerogel with a nanofiber network structure, a carbon aerogel material and a preparation method of the phenolic resin aerogel. The preparation method of the phenolic resin aerogel comprises the following steps: S1, dispersing a one-dimensional nanomaterial, a surfactant, a catalyst, a phenolic compound and an aldehyde compound in a solvent to form sol, whereinthe one-dimensional nanomaterial is selected from at least one of tellurium nanowires, cellulose nanofibers, carbon nanotubes, silver nanowires, calcium silicate nanowires, vanadium oxide nanowires, aluminum oxide nanowires, protein nanofibers and chitin nanofibers; S2, heating the sol to obtain phenolic resin hydrogel; and S3, carrying out supercritical drying on the phenolic resin hydrogel to obtain the phenolic resin aerogel. The phenolic resin aerogel and the carbon aerogel material have nanofiber network structures, good mechanical properties and low density. One-dimensional templates used in the preparation method are rich in types, convenient to prepare and low-cost.

Description

technical field [0001] The invention relates to the technical field of phenolic resin airgel materials, in particular to a phenolic resin airgel and carbon airgel material with a nanofiber network structure and a preparation method thereof. Background technique [0002] Phenolic resin airgel material is an organic airgel material with three-dimensional network structure and ultra-low density, which was first prepared by American scientist Pekala in 1989. Due to the excellent flame retardancy of phenolic resin itself and the unique structure of airgel, phenolic resin airgel is widely used as a fireproof and heat insulating material in construction, aerospace and other high-tech fields. Phenolic resin aerogels are generally prepared by sol-gel method followed by drying. However, the mechanical properties of phenolic resin aerogels prepared by traditional sol-gel methods are relatively brittle, which greatly limits their wide application. [0003] At present, using nanomateria...

Claims

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Application Information

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IPC IPC(8): C08L61/06C08L1/02C08K7/06C08K3/04C01B32/05C08J3/075
CPCC01B32/05C08J3/075C08J2361/06C08J2401/02C08K3/041C08K7/06C08K2201/003C08K2201/011
Inventor 俞书宏于志龙秦冰
Owner UNIV OF SCI & TECH OF CHINA
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