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Polyvinylidene fluoride composite material and preparation method thereof

A technology of polyvinylidene fluoride and polyvinylidene fluoride matrix, which is applied in the field of polyvinylidene fluoride composite materials with high β crystal content and its preparation, and can solve the problems of low content, increasing the dispersion of nano fillers, technology promotion and Industrial application constraints and other issues to achieve the effect of increasing the crystallization speed and shortening the molding cycle

Inactive Publication Date: 2013-03-20
HANGZHOU NORMAL UNIVERSITY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have found that although the addition of these fillers can effectively obtain the PVDF of the β crystal form, its content is not very high, and usually a high content of β crystal form requires a high content of fillers, which undoubtedly increases the number of nanoparticles in the polymer matrix. Difficulties in filler dispersibility and processability of the material itself
In summary, there are many defects in the current methods for obtaining β-PVDF, which are restricted in both technology promotion and industrial application.

Method used

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  • Polyvinylidene fluoride composite material and preparation method thereof
  • Polyvinylidene fluoride composite material and preparation method thereof
  • Polyvinylidene fluoride composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0045] PVDF was dried overnight in a vacuum drying oven at 80°C, and 50.00 g was weighed for later use; a certain mass of carbon nanotubes and a certain mass of ionic liquid were weighed according to the formula in Table 1, and placed in the mortar of an automatic grinder, at room temperature Grinding for 15 minutes to obtain modified carbon nanotubes. Add the modified carbon nanotubes and PVDF into the internal mixer in batches. The temperature of the internal mixer is 190°C. When the rotor speed of the internal mixer is 20rpm / min, the internal mixer is mixed for 1min; then the speed is increased to 50rpm / min And banburying 5min after discharge. After discharging, the samples are hot-pressed into sheets or films on a press at 200°C. See Table 1 for the sample code and the ratio of the three components in the sample.

Embodiment 8

[0047] PVDF was dried overnight in a vacuum oven at 80°C, and 50.00 g was weighed for later use; carbon nanotubes and ionic liquid were weighed according to the formula in Table 1, and stirred evenly without grinding. Add the modified carbon nanotubes and PVDF into the internal mixer in batches. The temperature of the internal mixer is 190°C. When the rotor speed of the internal mixer is 20rpm / min, the internal mixer is mixed for 1min; then the speed is increased to 50rpm / min And banburying 5min after discharge.

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Abstract

The present invention discloses a high beta crystal form content polyvinylidene fluoride composite material and a preparation method thereof. The composite material comprises ionic liquid modified carbon nanotubes and an organic material polyvinylidene fluoride, wherein a mass ratio of the polyvinylidene fluoride substrate to the modified carbon nanotubes is 100:0-12, and a mass ratio of the ionic liquid to the carbon nanotubes is 0-10:1. The preparation method comprises: carrying out coating modification on carbon nanotubes by using an ionic liquid, carrying out melt blending on the modified carbon nanotubes and polyvinylidene fluoride, and carrying out direct melt molding cooling to obtain the finished product. According to the present invention, polar crystal form content of PVDF in the prepared composite material can be 100%, the preparation process has characteristics of simpleness, energy source saving, and green environment protection, and the polyvinylidene fluoride composite material is expected to be provided for preparing various devices in fields such as piezoelectric materials, thermoelectric materials, dielectric materials and the like.

Description

1. Technical field [0001] The invention relates to a polyvinylidene fluoride composite material and a preparation method thereof, in particular to a polyvinylidene fluoride composite material with high β-crystal content obtained through the synergistic effect of ionic liquid and carbon nanotubes and a preparation method thereof. 2. Background technology [0002] PVDF (polyvinylidene fluoride) piezoelectric material is a kind of functional material sensitive to force, electricity, sound, light, heat, etc. It can realize the mutual conversion between mechanical energy and electrical energy, so it is widely used in industrial sectors and high-tech fields . Compared with traditional piezoelectric materials, PVDF piezoelectric materials have the following characteristics: 1. Small specific gravity, good frequency response, especially suitable for electroacoustic materials. The microphone developed with this material has the characteristics of simple structure, good water resista...

Claims

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Application Information

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IPC IPC(8): C08L27/16C08K9/10C08K7/00C08K3/04
Inventor 李勇进邢晨阳赵丽萍
Owner HANGZHOU NORMAL UNIVERSITY
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