Nano-sio based on polymer melt degradation 2 Surface modification method
A surface modification and polymer technology, applied in the field of nano-SiO2 surface modification based on polymer melt degradation, can solve the problems of unsuitable mass production, unsatisfactory effect, complicated process, etc., to achieve good application value and avoid environmental problems. Problems, the effect of simple process
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[0032] a Polymer / nano-SiO 2 Preparation of premix: nano-SiO 2 Blend with the polymer in a solvent to dissolve the polymer completely, then add a precipitant to precipitate the precipitate, and finally filter the precipitate (suction filtration) and dry it to obtain the polymer / nano-SiO 2 Premix; among them, the polymer and nano-SiO 2 The mass ratio is: 100: 10 ~ 20; b melt blended polymer / nano-SiO 2 Premix: Melt 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 the polymer / nano-SiO 2 blends;
[0033] 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 Nanoparticles; wherein, the high-speed centrifugation conditions are: centrifugation rate 8000-11000rpm, centrifugation time 10-30min;
[0034] d functionalized nano-SiO 2 Purification treatment: the fun...
Embodiment 1
[0042] Example 1 Nanometer SiO 2 Polymer surface modification method (without melt blending)
[0043] PC surface modified nano-SiO 2 method, the specific steps are:
[0044] 1) Ultrasonic dispersion of 5-10g nano-SiO 2 into 500ml THF solvent to obtain SiO 2 Dispersion liquid, ultrasonic power and time were 100W and 1h respectively; then 40-45g PC pellets were dissolved in the above SiO 2 Dispersion solution, stirred at room temperature for 4h; after PC was completely dissolved, 500ml methanol was added to promote PC / SiO 2 The premix is precipitated, filtered and dried for later use;
[0045] 2) 5g dry PC / SiO 2 The premix was dissolved again in 200ml THF, and the nanoparticles in the mixture were separated and extracted by high-speed centrifugation (10000rpm, 30min); in order to ensure that there were 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 solvent, s...
Embodiment 2
[0049] Example 2 Nano SiO 2 Polymer surface modification method (melt blending treatment 10min)
[0050] In this embodiment, the preparation and centrifugation method of the premix are the same as in Example 1, except that the premix (20 g thereof) is melt-blended on a twin-screw extruder for 10 minutes, wherein the screw speed is 30 rpm and the melting temperature 250°C, granulate after extrusion; the functionalized nanoparticles obtained in this example are referred to as SiO 2 -10.
[0051] The resulting SiO 2 -10 carries out thermogravimetric experiment (method is with embodiment 1), and result is as follows figure 1 shown by figure 1 It can be seen that SiO 2 TGA curve of -10 compared to pristine SiO 2 There are significant differences, and there is an obvious mass loss in the range of 350-550 ° C, indicating that the physical and chemical effects in the process of melt blending for 10 min promote the grafting of organic polymers on nano-SiO 2 surface.
[0052] In...
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