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Surface modification treatment method of halloysite nanotube

A halloysite nanotube and surface modification technology, which is applied in the field of preparation of nanocomposite materials, can solve the problems of not exhibiting mechanical properties, etc., and achieve the effects of strong effect, good dispersibility and compatibility, and improved mechanical properties.

Active Publication Date: 2014-10-29
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, infrared and SEM methods were not used to characterize the changes, and the mechanical properties were not much better than the pure epoxy resin system, and there were a certain amount of aggregates in the halloysite nanotubes in the system.

Method used

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  • Surface modification treatment method of halloysite nanotube
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  • Surface modification treatment method of halloysite nanotube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Purification of halloysite nanotube particles:

[0044] The halloysite nanotube particles of 50g pulverized and sieved are mixed with 1250g deionized water to form a mixed solution, and 0.25g of sodium pyrophosphate is added, and stirred for 24 hours until forming a uniform suspension containing halloysite nanotube particles; The suspension was left to stand for 18 hours and layered, and the upper layer slurry after standing was put into a centrifuge, and centrifuged at 7000r / min for 30 minutes, and the precipitate solid obtained by centrifugation was placed in an oven at a temperature of Dry at 60°C until there is no change in quality, and then sieve with a 150-mesh sieve to obtain purified halloysite nanotube particles;

[0045] (2) Halloysite nanotube particles are modified with silane coupling agent:

[0046] Add 12g of the purified halloysite nanotube particles obtained in step (1) to 200mL of hydrochloric acid solution (2.5mol / L), ultrasonically disperse for ...

Embodiment 2

[0054] (1) Purification of halloysite nanotube particles:

[0055] Mix 30 g of halloysite nanotube particles crushed and sieved with 240 g of deionized water to form a mixed solution, add 0.03 g of sodium hexametaphosphate, and stir for 1 hour until a uniform suspension containing halloysite nanotube particles is formed; The suspension was left to stand for 48 hours, separated into layers, and the upper layer slurry after standing was put into a centrifuge, and centrifuged at 10000r / min for 3 minutes, and the precipitate solid obtained by centrifugation was placed in an oven at temperature Dry at 80°C until there is no change in quality, and then sieve with a 250-mesh sieve to obtain purified halloysite nanotube particles;

[0056] (2) Halloysite nanotube particles are modified with silane coupling agent:

[0057] Add 15g of the purified halloysite nanotube particles obtained in step (1) into 1000mL of hydrogen peroxide, ultrasonically disperse for 5 minutes and then stir at ...

Embodiment 3

[0065] (1) Purification of halloysite nanotube particles:

[0066] Mix 15 g of halloysite nanotube particles crushed and sieved with 180 g of deionized water to form a mixed solution, add 0.015 g of sodium polyacrylate with a molecular weight of 5000 g / mol, and stir for 10 hours until uniform halloysite nanotubes are formed. Suspension of particles; the suspension was left to stand for 8 hours, layered, and the upper layer slurry after standing was put into a centrifuge, and centrifuged at 4000r / min for 30 minutes, and the precipitate solid obtained by centrifugation was separated Dry in an oven at a temperature of 100°C until the quality does not change, and then sieve with a 150-mesh sieve to obtain purified halloysite nanotube particles;

[0067] (2) Halloysite nanotube particles are modified with silane coupling agent:

[0068] Add 10 g of the purified halloysite nanotube particles obtained in step (1) to 500 mL of concentrated sulfuric acid, ultrasonically disperse for 4...

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Abstract

The invention relates to a method for preparing a nanocomposite and particularly relates to a method for modifying a halloysite nanotube with a silane coupling agent and an epoxy resin nanocomposite prepared by mixing the modified halloysite nanotube obtained by the method and epoxy resin. The surface modification treatment method of the halloysite nanotube, which is disclosed by the invention comprises the following steps of adding the silane coupling agent into a suspension containing the acidified halloysite nanotube and carrying out condensation reaction on a hydrolyzable X group on the silane coupling agent and a hydroxy group on the lamella on the surface of the halloysite nanotube to obtain the halloysite nanotube which is modified by the silane coupling agent and of which an inner cavity and the outer surface are grafted by the silane coupling agent, and mixing the modified halloysite nanotube and epoxy resin to prepare the epoxy resin nanocomposite. The epoxy resin nanocomposite can obtain the desired mechanical properties and thermal properties.

Description

technical field [0001] The invention relates to a preparation method of nanocomposite materials, in particular to a method for modifying halloysite nanotubes with a silane coupling agent, and an epoxy compound prepared by mixing the modified halloysite nanotubes obtained by the method with epoxy resin Resin nanocomposite material, the prepared epoxy resin nanocomposite material can obtain ideal mechanical properties and thermal properties. Background technique [0002] Epoxy resin is widely used in adhesives, electronic instruments, light industry, construction, machinery, Coatings and electrical insulation and other fields. However, due to the highly cross-linked network molecular structure, epoxy resins often exhibit disadvantages such as poor toughness, susceptibility to stress cracking, and short fatigue life, which limit their applications. Aiming at the problem of poor toughness of epoxy resin, many scholars improved it by introducing fillers, but there are also insu...

Claims

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Application Information

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IPC IPC(8): C09C1/40C09C3/12C08L63/00C08K9/06C08K7/00C08K3/34
Inventor 孙攀刘国明刘学新赵莹董侠周勇苏允兰王笃金
Owner INST OF CHEM CHINESE ACAD OF SCI
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