Method for preparing poly(vinylidene difluoride) plates through dual-band screw extrusion

A polyvinylidene fluoride and double-stage screw technology, which is applied in the field of preparing polyvinylidene fluoride sheets, can solve the problems of many impurities, the flatness and smoothness of the surface of the sheet, the lack of smoothness, and the inability to enlarge the area of ​​the sheet, etc., to achieve a stable and easy preparation process. control effect

Inactive Publication Date: 2012-06-27
江苏昊华光伏科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the existing process for manufacturing PVDF sheets is a molding process, which has some shortcomings. The main problems are: the flatness and smoothness of the surface of the sheet are not enough; the surface of the sheet is yellow; there are many impurities in the sheet product; the area of ​​the sheet cannot be enlarged; steam drum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Fully mix 100 kg of raw material PVDF and 0.1 kg of antioxidant 1076.

[0021] 2) Input the above-mentioned mixed raw material PVDF into the first-stage plasticizing extruder (twin-screw extruder) for mixed extrusion. The temperature of the front section of the extruder is controlled at 155-160°C, and the middle section of extrusion is controlled at 175-180°C °C, the extrusion end section is controlled at 190-195 °C. Use the exhaust device at the plasticizing end of the screw to discharge the moisture and low-molecular raw materials in the raw materials to obtain primary plasticized materials.

[0022] 3) The primary plasticizing material is input into the secondary plasticizing section, the temperature is controlled at 205°C, and the pressure is extruded under the pressure of 22MPa to ensure the compactness of the finished plate.

[0023] 4) The PVDF in the secondary plasticizing section is extruded at a high pressure with an extrusion speed of 0.4m / h, and then ent...

Embodiment 2

[0028] 1) Fully mix 100 kg of raw material PVDF and 0.085 kg of antioxidant 168.

[0029] 2) Input the above-mentioned mixed raw material PVDF into the first-stage plasticizing extruder (twin-screw extruder) for mixed extrusion. The temperature in the front section of the extruder is controlled at 150-155°C, and the middle section of extrusion is controlled at 170-175°C. °C, the extrusion end section is controlled at 195-200 °C. Use the exhaust device at the plasticizing end of the screw to discharge the moisture and low-molecular raw materials in the raw materials to obtain primary plasticized materials.

[0030] 3) The primary plasticizing material is input into the secondary plasticizing section, the temperature is controlled at 220°C, and the pressure is extruded under a pressure of 20MPa to ensure the compactness of the finished plate.

[0031] 4) The PVDF in the secondary plasticizing section is extruded at a high pressure with an extrusion speed of 0.15m / h, and then en...

Embodiment 3

[0036] 1) Fully mix 100 kg of raw material PVDF and 0.09 kg of antioxidant 1076.

[0037] 2) Input the above-mentioned mixed raw material PVDF into the first-stage plasticizing extruder (twin-screw extruder) for mixed extrusion. The temperature of the front section of the extruder is controlled at 155-160°C, and the middle section of extrusion is controlled at 170-175°C. °C, the extrusion end section is controlled at 190-195 °C. Use the exhaust device at the plasticizing end of the screw to discharge the moisture and low-molecular raw materials in the raw materials to obtain primary plasticized materials.

[0038] 3) The primary plasticizing material is input into the secondary plasticizing section, the temperature is controlled at 210°C, and the pressure is extruded under the pressure of 25MPa to ensure the compactness of the finished plate.

[0039] 4) The PVDF in the secondary plasticizing section is extruded at a high pressure with an extrusion speed of 0.15m / h, and then ...

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Abstract

The invention relates to a method for preparing poly(vinylidene difluoride) (PVDF for short) plates through dual-band screw extrusion. The PVDF is taken as a raw material and an antioxidant 1076 or an antioxidant 168 is taken as an anti-ageing aid, and the method comprises the following steps of: performing melt blending and dispersion through a twin screw; extruding by using a single screw extruder; and molding by using a coat-hanger die to obtain the PVDF plates. The preparation method is stable and easy to control; wastewater and waste gas are not generated in the preparation process, the manufactured PVDF plates are dense and have bright and jade green surfaces, bubbles are absent in the plates, and the length of the PBDF plates can be cut according to requirements.

Description

technical field [0001] The invention relates to a method for preparing polyvinylidene fluoride sheets, in particular to a method for preparing polyvinylidene fluoride sheets by double-stage screw extrusion. Background technique [0002] PVDF sheet, that is, polyvinylidene fluoride sheet, English name Polyvinylidene fluoride, is extruded into a sheet with PVDF resin at high temperature, it is a fairly pure polymer, it does not contain UV stabilizers, softeners, lubricants or flame retardants additives such as agents. PVDF plates can be welded into tanks and equipment with PVDF welding rods. Used to hold various chemical liquids. It is especially suitable for pure water systems and the transfer of pure chemical reagents in the semiconductor industry. Due to its chemical inertness, PVDF hardly reacts with any media. [0003] PVDF sheet has high temperature resistance (can work continuously at 150 degrees), has excellent chemical corrosion resistance and hydrolysis resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C69/00B29C47/00B29C47/38B29C47/60B29C59/04B29C71/02B29L7/00B29C48/385B29C48/395B29C48/40
CPCB29C48/397B29C48/385B29C48/40
Inventor 龚福根王海林王卫国徐一峰
Owner 江苏昊华光伏科技有限公司
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