Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of polyvinylidene fluoride thin film

A technology of polyvinylidene fluoride gel film and polyvinylidene fluoride, which is applied in the field of preparation of polyvinylidene fluoride film, can solve the problems of PVDF thermal price reduction, unsuitable use, influence on PVDF mechanical strength and comprehensive performance, etc., and achieve excellent mechanical properties Performance, the effect of preventing thermal depreciation

Active Publication Date: 2012-11-14
无锡高拓新材料股份有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, only a few companies in the world, such as the United States, France and Japan, can produce PVDF films, all of which use the melting method for production. The requirements of melt processing conditions usually require the polymer to have a high flow coefficient, so it is not suitable to use ultra-high molecular weight grade PVDF, thereby reducing the mechanical strength of PVDF film
[0004] Generally, PVDF can be improved by adding some fillers or introducing other polymers for modification in order to improve its mechanical properties when it satisfies the processing conditions of the melt method, which will inevitably reduce the overall fluorine content of the film material. , thus having some adverse effects on the inherent excellent characteristics of PVDF
[0005] On the other hand, if high-molecular-weight PVDF is used for melting film-making, due to the influence of the increase in the melting strength of the material and the decrease in the flow coefficient, the molding processing temperature and pressure will also increase accordingly, which will easily cause thermal price reduction of PVDF, and it The decomposition product HF is a strong acid, which has self-catalytic price reduction and corrosiveness, which will affect the mechanical strength and comprehensive performance of PVDF

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Under the condition of stirring at 10-30 rpm, add high-molecular-weight domestic PVDF (purchased from T series of Zhejiang Juhua Group) with a melt index of 0-1.5 g / min into the trimethyl phosphate, and gradually raise the temperature to 50-80 °C , maintained for 1 to 3 hours to fully dissolve the PVDF to obtain a uniform solution with a PVDF weight percentage of 50%.

[0035] At 70°C, the PVDF solution was subjected to vacuum defoaming for 2 hours to remove the air bubbles in the solution, and the temperature was maintained. on the drum, rapidly cooled into a gel film with self-sustaining strength, and peeled off from the surface of the drum, placed on a series of rollers at a temperature of 80°C for longitudinal stretching, the stretching degree is 200%, and then placed on In a tenter with a temperature of 120° C., transverse stretching is carried out, and the stretching degree is 150%. Under these conditions, hot air drying at a temperature of 150°C is carried out t...

Embodiment 2

[0039] With embodiment 1, difference is solvent with acetone, or dimethyl phthalate, or dipropylene carbonate, or tetrahydrofuran, or methyl ethyl ketone, or dimethyl formamide, or dimethyl acetamide, or dimethyl Base sulfoxide, or N-methylpyrrolidone, or diacetone alcohol, or glycol ether replacement, the performance evaluation results are the same as in Example 1.

Embodiment 3

[0041] Same as Example 1, the difference is that the solvent is a mixed solvent of dimethylformamide and dimethyl sulfoxide in a volume ratio of 1: 1, or N-methylpyrrolidone and dimethylacetamide in a volume ratio of 1: 1 The mixed solvent is replaced, and performance evaluation result is the same as embodiment 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
temperatureaaaaaaaaaa
temperatureaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a polyvinylidene fluoride thin film, which comprises the following steps: fully dissolving polyvinylidene fluoride in an organic solvent at the temperature of 30-80 DEG C, keeping the temperature at 30-80 DEG C, and performing vacuum deaeration for 1-5 hours; slobbering polyvinylidene fluoride solution onto a stainless steel rotating wheel, enablingthe surface temperature of the stainless steel rotating wheel to be minus 10-20 DEG C, cooling and molding, further stripping from the wheel surface, and finally obtaining a polyvinylidene fluoride gel film; performing longitudinal stretching on the polyvinylidene fluoride gel film through a roller drum, wherein the longitudinal stretching temperature is 20-120 DEG C, and the stretching degree is50-550%; further performing transverse stretching through an expanding device, wherein the transverse stretching temperature is 80-140 DEG C, and the stretching degree is 50-550%; and finally performing hot air drying so as to obtain the polyvinylidene fluoride thin film. The polyvinylidene fluoride thin film with excellent mechanical properties can be prepared through the preparation method, andthe polyvinylidene fluoride thin film can particularly provide a base material with excellent quality for a solar photovoltaic back plate.

Description

technical field [0001] The invention relates to a method for preparing a film, in particular to a method for preparing a polyvinylidene fluoride film Background technique [0002] Due to its high fluorine content and high crystallinity, polyvinylidene fluoride (PVDF) has excellent chemical resistance and outdoor weather resistance, high mechanical strength and good thermal stability, excellent stain resistance and sterilization ability, and is effective Blocking ultraviolet rays, completely resisting sunlight degradation, high dielectric strength and volume resistivity and other special properties, have been widely used in various fields. As a thin film material, it is a new generation of basic material for solar photovoltaic backplanes, which are rapidly growing in use today. [0003] At present, only a few companies in the world, such as the United States, France and Japan, can produce PVDF films, all of which use the melting method for production. The requirements of me...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L27/16B29C51/00
Inventor 沈国强
Owner 无锡高拓新材料股份有限公司