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Nano SiO2 surface modification method on basis of polymer melt degradation

A surface modification and polymer technology, which is applied in the field of nano-SiO2 surface modification based on polymer melt degradation, can solve the problems of unsuitable mass production, unsatisfactory effect, and complicated process, so as to achieve good application value and avoid environmental pollution. The problem, the simple effect of the process

Active Publication Date: 2015-08-19
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above modification methods are not suitable for mass production of composite materials due to the complexity of the process, high cost, or unsatisfactory effects.

Method used

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  • Nano SiO2 surface modification method on basis of polymer melt degradation
  • Nano SiO2 surface modification method on basis of polymer melt degradation
  • Nano SiO2 surface modification method on basis of polymer melt degradation

Examples

Experimental program
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Effect test

preparation example Construction

[0028] a polymer / nano SiO 2 Preparation of premix: the nano SiO 2 Blend with the polymer in the solvent through the solution to completely dissolve the polymer, then add a precipitation agent to precipitate the precipitate, and finally filter (suction) and dry the precipitate to obtain the polymer / nano-SiO 2 Premix; among them, polymer and nano SiO 2 The mass ratio is: 100:10~20; b melt blended polymer / nano SiO 2 Premix: melt and blend the premix prepared in step a above the melting point of the polymer and below the decomposition temperature for 5-30 minutes to obtain polymer / nano-SiO 2 Blend

[0029] c Centrifugal extraction of polymer surface modified nano SiO 2 : Dissolve the blend obtained in step b into a solvent, and obtain functionalized SiO by high-speed centrifugation 2 Nano particles; Among them, the high-speed centrifugation conditions are: centrifugation speed 8000-11000rpm, centrifugation time 10-30min;

[0030] d Functionalized nano SiO 2 Purification treatment: the fu...

Embodiment 1

[0038] Example 1 Nano SiO 2 The polymer surface modification method (without melt blending treatment)

[0039] PC surface modified nano SiO 2 The method, the specific steps are:

[0040] 1) Ultrasonic dispersion of 5~10g nano-SiO 2 Get SiO in 500ml THF solvent 2 Dispersion liquid, ultrasonic power and time are 100W and 1h respectively; then 40~45g PC pellets are dissolved in the above SiO under mechanical stirring conditions 2 Disperse liquid, stir at room temperature for 4h; after PC is completely dissolved, add 500ml methanol to promote PC / SiO 2 Premix precipitated out, filtered and dried for later use;

[0041] 2) Put 5g of dry PC / SiO 2 The premix was dissolved in 200ml THF again, and the nanoparticles in the extraction mixture were separated by high-speed centrifugation (10000rpm, 30min); in order to ensure that there are no free PC molecular chains on the surface of the separated nanoparticles, the precipitate obtained by the first centrifugation was redispersed into THF In the ...

Embodiment 2

[0045] Example 2 Nano SiO 2 Polymer surface modification method (melt blending treatment 10min)

[0046] In this example, the preparation and centrifugal treatment method of the premix is ​​the same as in Example 1, except that the premix (20g of which is weighed) is melted and blended on a twin-screw extruder for 10 minutes. The screw speed is 30rpm and the melting temperature is 250°C, pelletizing after extrusion; the functionalized nanoparticles obtained in this example are referred to as SiO for short 2 -10.

[0047] SiO 2 -10 Perform thermogravimetric experiment (the method is the same as in Example 1), the results are as follows figure 1 Shown by figure 1 It can be seen that SiO 2 -10 thermogravimetric curve compared to the original SiO 2 There is a significant difference, and there is a significant mass loss in the range of 350 to 550 ℃, indicating that the physical and chemical effects during the 10 min melt blending process promote the grafting of organic polymers on nano-S...

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Abstract

The invention belongs to the field of the inorganic nano particle surface modification, and particularly relates to a nano SiO2 polymer surface modification method on the basis of polymer melt degradation. The nano SiO2 surface modification method on the basis of the polymer melt degradation comprises the following steps: a, preparing a polymer / nano SiO2 premix; b, melting and blending the polymer / nano SiO2 premix; c, centrifugally extracting functional nano SiO2 in the polymer / nano SiO2 blend; d, purifying the functional nano SiO2. According to the novel SiO2 nano particle surface modification method, the polymer molecular chains are chemically grafted onto the surface of the nano SiO2 by utilizing the degradation of polymer in the physical melt blending process, compared with the traditional polymer grafting inorganic nano particle method, the method is suitable for mass production; moreover, the method has characteristics of simple process, low cost, high grafting rate and the like, and the environmental problem caused by the consumption of a great amount of organic solvent in the traditional chemical modification process can be avoided.

Description

Technical field: [0001] The invention belongs to the field of surface modification of inorganic nanoparticles, and specifically relates to a nano SiO based on polymer melt degradation 2 Surface modification method. Background technique: [0002] Since inorganic nanoparticles exhibit specific properties different from those of general materials in terms of heat, magnetism, light, surface activity, etc., their application and development have attracted more and more attention. But in terms of the nature of the nanoparticle itself, due to its high surface energy, it often leads to agglomeration of the nanoparticle, which affects the performance of the nanoparticle. In recent years, there have been many studies on the surface modification and dispersion of nanoparticles, and corresponding simple and feasible methods for characterizing dispersion have also been produced. [0003] Nano SiO 2 As a typical spherical nanoparticle, it has been widely used as a polymer nanofiller due to its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/04C08K3/36C08L69/00C09C1/28C09C3/10
Inventor 王波冯跃战陈阳陈薇薇孙瑞洲刘春太申长雨
Owner ZHENGZHOU UNIV
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