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Method for preparing superfine phenolic fibre

A technology of phenolic fiber and phenolic resin, which is applied in the field of preparation of ultrafine phenolic fiber and can solve the problems of preparing phenolic fiber

Active Publication Date: 2013-01-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If electrospinning can be used for the preparation of phenolic fibers, it will not only simplify the preparation process of phenolic fibers, but also make them have more excellent physical and chemical properties, but so far there is no technology to prepare phenolic fibers using electrospinning technology. to report

Method used

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  • Method for preparing superfine phenolic fibre
  • Method for preparing superfine phenolic fibre
  • Method for preparing superfine phenolic fibre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment includes the following steps:

[0027] Step 1, the commercially available low molecular weight 500w <3000 resol resin is configured as an organic solution of 20wt% resol resin, the resol resin is a thermosetting phenol resin with Mw=2000, and the solvent is ethanol;

[0028] Step 2. Add 0-1.5 wt% high molecular weight linear polymer to the solution and stir until completely dissolved. The high molecular weight linear polymer is polyvinyl butyral PVB;

[0029] Step 3: Electrospin the obtained solution to obtain superfine phenolic fiber and phenolic fiber felt. During the electrospinning process, the ambient humidity is RH35%, the temperature is 25°C, the voltage is 25kv, and the distance between the needle and the substrate is 25cm. The feed rate was 1 ml / h.

[0030] The morphology of the electrospun product is shown in Figure (1). When no polyvinyl butyral PVB is added, the product has an uneven bead structure. With the increase of PVB content, the prod...

Embodiment 2

[0032] This embodiment includes the following steps:

[0033] Step 1, the commercially available low molecular weight 500w <3000 resol resin is configured as an organic solution of 25wt% resol resin, the resol resin is a thermosetting phenol resin with Mw=2000, and the solvent is ethanol;

[0034] Step 2: Add 0.6wt% high molecular weight linear polymer to the solution and stir until completely dissolved. The high molecular weight linear polymer is polyvinyl butyral PVB

[0035]Step 3: Electrospinning the obtained solution to obtain superfine phenolic fiber and phenolic fiber felt. During the electrospinning process, electrospinning is carried out under two conditions of ambient humidity RH50% and RH30% respectively, the temperature is 25°C, and the voltage The voltage is 25kv, the distance between the needle and the substrate is 25cm, and the solution feed rate is 1ml / h.

[0036] The morphology of the electrospun product is shown in the attached figure (2). It can be seen tha...

Embodiment 3

[0039] This embodiment includes the following steps:

[0040] Step 1, the commercially available low molecular weight 500w <3000 resol resin is configured as an organic solution of 25wt% resol resin, the resol resin is a thermosetting phenol resin with Mw=2000, and the solvent is a mixture of acetone, ethanol or ethanol and DMF in different volume ratios (9:1 and 7:3);

[0041] Step 2: Add 0.6wt% high molecular weight linear polymer to the solution and stir until completely dissolved. The high molecular weight linear polymer is polyvinyl butyral PVB

[0042] Step 3: Electrospinning the obtained solution to obtain superfine phenolic fiber and phenolic fiber felt, the ambient humidity is RH30%, the temperature is 25°C, the voltage is 25kv, the distance between the needle and the substrate is 25cm, and the solution feed rate is 1ml / h .

[0043] The morphology of the prepared electrospun product is shown in Figure 5 , when the solvent is acetone, the cross-section of the resul...

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Abstract

The invention relates to a method for preparing superfine phenolic fibre, comprising the following steps of: firstly, preparing commercially available soluble phenolic resin with low molecular weight (Mw)of 500-3000 into organic solution containing 10-40wt% of soluble phenolic resin; secondly, adding high molecular weight linear polymer into the solution and stirring until the high molecular weight linear polymer is completely dissolved, wherein mass ratio of the high molecular weight linear polymer to the soluble phenolic resin is 1: (20-100); and thirdly, carrying out electrostatic spinning on the solution to obtain the superfine phenolic fibre and a phenolic fiber felt, wherein relative humidity RH of an electrostatic spinning experiment is 15-55%, and the obtained superfine phenolic fibres can be cylindrical, elliptic cylinder-shaped and belt-shaped. Aiming at the characteristic that low-molecular-weight phenolic resin can be easily melted, the invention provides a non-constant-speed stepped heating and curing process, and curing time is shortened under the condition that the fibers are fully crosslinked and are not melted.

Description

technical field [0001] The invention belongs to the field of phenolic fiber preparation, and in particular relates to a preparation method of ultrafine phenolic fiber. Background technique [0002] Since phenolic fiber has a unique three-dimensional cross-linked structure and properties such as flame resistance, heat insulation and corrosion resistance, it has shown a wide range of application prospects since it was first successfully studied by J.Economy of Carborundum Company in the United States in 1963. Phenolic fibers can be used for thermal insulation, insulation and corrosion-resistant materials in aerospace, national defense and aviation industries, and can also be used as fireproof and corrosion-resistant clothing and acid-resistant and corrosion-resistant filter materials. At the same time, it is also the precursor raw material for special fibers such as carbon fiber, activated carbon fiber and ion exchange. [0003] Traditional phenolic fiber preparation methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94D01F1/10D04H1/4326D04H1/728
Inventor 黄正宏王磊康飞宇
Owner TSINGHUA UNIV
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