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Polyethylene glycol-modified halloysite carbon nanotubes and preparation method thereof

A technology of halloysite nanotube and polyethylene glycol modification, which is applied in the treatment of dyed polymer organic compounds and fibrous fillers, etc., can solve the problems of affecting the application effect, unsatisfactory dispersion effect, and matrix agglomeration.

Inactive Publication Date: 2012-10-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the halloysite nanotubes are affected by the hydrogen bond formed between the surface hydroxyl groups and the size effect, they are prone to agglomeration in the matrix during the preparation of nanocomposites, resulting in unsatisfactory dispersion effects and thus affecting their application effects. Therefore, before use It is often necessary to modify it

Method used

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  • Polyethylene glycol-modified halloysite carbon nanotubes and preparation method thereof
  • Polyethylene glycol-modified halloysite carbon nanotubes and preparation method thereof
  • Polyethylene glycol-modified halloysite carbon nanotubes and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Prepare halloysite nanotubes and absolute ethanol into a suspension according to the mass ratio of 1:20, stir for 50 minutes and then ultrasonically disperse for 30 minutes until a uniform suspension is formed; filter the obtained suspension , take the upper solid and dry it in an oven at 60°C until the quality does not change, and then sieve it with a 200-mesh sieve to obtain impurity-free halloysite nanotubes. The purified halloysite nanotubes were added into deionized water at a mass ratio of 1:20, and ultrasonically dispersed until a uniform suspension was formed. Add polyethylene glycol to the suspension, and control the quality of the added polyethylene glycol to be 30% of the suspension mass. Stir at 60°C for 4 hours and then filter, dry the obtained solid at 60°C until there is no change in quality, grind it into powder, and sieve it with a 200-mesh sieve to obtain the modified halloysite nanotubes. The halloysite nanotube after the modified treatment of gained...

Embodiment 2

[0016] Prepare halloysite nanotubes and absolute ethanol into a suspension according to the mass ratio of 1:25, stir for 60 minutes and then ultrasonically disperse for 40 minutes until a uniform suspension is formed; filter the obtained suspension , take the upper solid and dry it in an oven at 65°C until the quality does not change, and then sieve it with a 250-mesh sieve to obtain impurity-free halloysite nanotubes. The purified halloysite nanotubes were added into deionized water at a mass ratio of 1:25, and ultrasonically dispersed until a uniform suspension was formed. Add polyethylene glycol to the suspension, and control the quality of the added polyethylene glycol to be 35% of the suspension mass. Stir at 65°C for 4.5h and then filter, dry the obtained solid at 65°C until there is no change in quality, grind it into powder, and sieve it with a 250-mesh sieve to obtain the modified halloysite nanotubes. The halloysite nanotube after the modified treatment of gained is...

Embodiment 3

[0018] Prepare halloysite nanotubes and absolute ethanol into a suspension according to the mass ratio of 1:22, stir for 55 minutes and then ultrasonically disperse for 35 minutes until a uniform suspension is formed; filter the obtained suspension , take the upper solid and dry it in an oven at 63°C until the quality does not change, and then sieve it with a 230-mesh sieve to obtain impurity-free halloysite nanotubes. The purified halloysite nanotubes were added into deionized water at a mass ratio of 1:22, and ultrasonically dispersed until a uniform suspension was formed. Add polyethylene glycol to the suspension, and control the quality of the added polyethylene glycol to be 33% of the suspension mass. Stir at 63°C for 4.25h and then filter, dry the obtained solid at 63°C until there is no change in quality, grind it into powder, and sieve it with a 230-mesh sieve to obtain the modified halloysite nanotubes. The modified halloysite nanotubes were observed by scanning elec...

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Abstract

The invention relates to a polyethylene glycol-modified halloysite carbon nanotubes and a preparation method thereof. The preparation method comprises the following steps: purifying halloysite carbon nanotubes with ethanol; adding the purified halloysite carbon nanotubes into deionized water according to a mass ratio of 1: 20 to 1: 25 to prepare a suspension; adding the purified halloysite carbon nanotubes which are 30 to 35 mass percent of the suspension into the suspension; stirring for 4 to 4.5 hours at 60 to 65 DEG C and filtering; drying an obtained solid at 60 to 65 DEG C till there is no mass change; and grinding into powder, sieving with a 200 to 250-mesh sieve, and thus obtaining polyethylene glycol-modified halloysite carbon nanotube particles. In an infrared spectrogram of the modified halloysite carbon nanotubes, an absorption peak near 2894cm<-1> and double absorption peaks near 1358cm<-1> and 1475cm<-1> are newly added, wherein a strong diffraction peak exists when 2Theta is equal to 12 degrees; the layer spacing is about 7.4 and a 10 small peak exists; and part of tubular structures are developed into lamellar structures. The halloysite carbon nanotubes are less likely to aggregate and have wider application potential in preparation of nanocomposites.

Description

technical field [0001] The present invention relates to the technical field of surface modification treatment of inorganic nanoparticles, specifically refers to a method for modifying halloysite nanotubes (halloysite nanotubes, halloysite nanotubes) with polyethylene glycol (PEG), especially The halloysite nanotube is modified by polyethylene glycol and its preparation method. Background technique [0002] Halloysite nanotube (Hallosite nanotube) is a kind of low-cost natural nanotube, which is a double-layer 1:1 type aluminosilicate, and its molecular formula is Al 2 Si 2 o 5 (OH) 4 ·nH 2 O (n=0 or 2), has a typical crystalline structure, usually a multi-walled tubular structure, which is formed by the dislocation of the inner aluminum-oxygen octahedron and the outer silicon-oxygen tetrahedral lattice dislocation. There is water of crystallization between the layers. After analysis, halloysite nanotubes contain two types of hydroxyl groups: silicon hydroxyl groups loc...

Claims

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Application Information

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IPC IPC(8): C09C1/40C09C3/10
Inventor 许鑫华徐志强方海东
Owner TIANJIN UNIV
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