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A kind of modified nano silicon dioxide and preparation method thereof

A nano-silica and modification technology, applied in the field of nano-silica modification, can solve the problems of difficulty in obtaining uniform dispersion, easy agglomeration, and high surface energy, and achieve good toughness, good dispersibility, and reasonable synthesis methods. Effect

Active Publication Date: 2018-01-09
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering SiO 2 The surface energy is high, and it is easy to agglomerate. It is difficult to obtain uniform dispersion on the nanometer scale and nano-SiO 2 Good interfacial bonding between particles and polymer matrix materials

Method used

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  • A kind of modified nano silicon dioxide and preparation method thereof
  • A kind of modified nano silicon dioxide and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0017] The preparation method of the nano silicon dioxide modified by tin catalyst of the present invention comprises the following steps:

[0018] Step (1): Nano silica and cationic surfactant are dispersed in an organic solvent to obtain a uniformly dispersed mixed solution;

[0019] Step (2): adding an isocyanate silane coupling agent to the mixed solution described in step (1), and reacting to obtain nano-silica modified by an isocyanate silane coupling agent;

[0020] Step (3): reacting the isocyanate-based silane coupling agent-modified nano-silica obtained in step (2) with a catalyst to obtain catalyst-modified nano-silica.

[0021] [Step (1): Nano silica and cationic surfactant are dispersed in an organic solvent to obtain a uniformly dispersed mixture]

[0022] Add a certain amount of cationic surfactant to an appropriate amount of organic solvent, the electromagnetic stirring speed is 400-600r / min, the temperature is 50-70°C, and the stirring time is 10-60min to obt...

Embodiment 1

[0039] Disperse 10g of tetraoctylammonium bromide in 1500ml of xylene, the electromagnetic stirring speed is 500r / min, and magnetically stir for 20min to obtain solution A; 50g of nano silicon dioxide is added to solution A, and ultrasonic treatment is performed for 1h to obtain Uniformly dispersed mixture B.

[0040] Put the mixed liquid B into the condensing reflux device, under N 2 Under protection, 10 ml of triethoxysilane isocyanate coupling agent was added dropwise, and reacted in an oil bath at 80° C. for 24 hours. After the reaction is completed, the product is separated and washed several times with xylene to obtain nano silicon dioxide modified by grafted silane coupling agent.

[0041] The above-mentioned modified nano-silica was again ultrasonically dispersed in xylene, N 2 Protected and magnetically stirred, 15g of catalyst was added, the reaction temperature was 80°C, and the reaction was carried out for 6h. After the reaction is completed, the product is sepa...

Embodiment 2

[0044] Using the catalyst-modified nano-silica prepared in Example 1, a pCBT nanocomposite material with 5 wt% catalyst-modified nano-silica was prepared. The fracture absorption energy of this composite material is 610J, compared with 370J of the pure pCBT composite material, its toughening effect is increased by about 65%.

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Abstract

The invention belongs to a modification technology of nano-silica for composites and particularly relates to a modification technology of nano-silica for a cyclic butylene terephthalate nanocomposite. The designed synthetic method is reasonable, and obtained modified nano-silica particles have good dispersibility; the obtained modified nano-silica particles can serve as a filling agent and also can serve as a catalyst, and the prepared polybutylene terephthalate / nano-silica composite has good toughness.

Description

[0001] technical field [0002] The invention belongs to the modification technology of nano silicon dioxide for composite materials, in particular to the modification technology of nano silicon dioxide suitable for cyclic butylene terephthalate nano composite materials. Background technique [0003] Cyclic butylene terephthalate oligomer (CBT) is a composite material matrix resin with high fluidity, high wettability and high filling capacity. Polymer. CBT has a low melt viscosity (24mPa s, 190°C), and can quickly infiltrate various reinforcements after melting; adding a catalyst can obtain high molecular weight polybutylene terephthalate through ring-opening polymerization at a temperature lower than the melting point of the product Alcohol ester (PBT, the polybutylene terephthalate obtained by CBT polymerization is marked as pCBT to distinguish it from conventional PBT), the reaction is very easy to control and there is no release of small molecule by-products, no heat of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/06C08K9/04C08K3/36C08L67/02
CPCC08K3/36C08K9/04C08K9/06C08K2201/011C08L67/02
Inventor 张利公绪强王雅祺包锦标
Owner NINGBO UNIV
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