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Production method of polytetrafluoroethylene film

A technology of polytetrafluoroethylene and its production method, which is applied in the field of chemical materials and can solve problems such as unreasonable process conditions, uneven products, and insufficient density

Pending Publication Date: 2018-02-23
镇江春环密封件集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Plastic film is a kind of film with a wide range of applications, and with the development of society, there are more and more demands for plastic films in all walks of life. Plastic films are mainly used for packaging and laminating, and have been widely used in food , medicine, chemical industry and other fields have brought great convenience to people's life, and polytetrafluoroethylene has good heat resistance and light weight performance, and the market share is also high, so it promotes polytetrafluoroethylene The development of ethylene film technology, especially the PTFE film has good heat resistance, acid and alkali resistance, friction resistance, light weight, non-toxic, odorless and other advantages, so it develops very rapidly. However, the existing PTFE film Due to the shortcomings of the formula and production method of the vinyl film, its stretchability, thermal conductivity, corrosion resistance and smoothness cannot be guaranteed, especially the unreasonable process conditions in the production process, which makes the product uneven and dense. not enough flaws

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The production method of the polytetrafluoroethylene film of the present embodiment may further comprise the steps:

[0015] A, take by weight 75 parts of polytetrafluoroethylene, 15 parts of polyacrylamide, 7 parts of calcium carbonate, 1 part of silicon dioxide, 6 parts of polyurethane, and 13 parts of polyimide are put into the reactor;

[0016] B. Introduce nitrogen into the reactor and heat for 20 minutes, the heating temperature is 170°C, then weigh 2 parts of glass fiber, 3 parts of talcum powder, and 1 part of carbon black by weight and put them into the reactor to continue heating and reaction for 40 minutes minutes, the heating temperature is 230°C;

[0017] C. Feed the reacted mixture into the twin-screw extruder through the constant temperature hopper for processing, and the temperature of the constant temperature hopper is controlled at 75°C;

[0018] D. The twin-screw extruded strips of the twin-screw extruder are air-cooled and then water-cooled in the t...

Embodiment 2

[0020] The production method of the polytetrafluoroethylene film of the present embodiment may further comprise the steps:

[0021] A, take by weight 80 parts of polytetrafluoroethylene, 17 parts of polyacrylamide, 9 parts of calcium carbonate, 1 part of silicon dioxide, 7 parts of polyurethane, and 14 parts of polyimide and put them into the reactor;

[0022] B. Feed nitrogen gas into the reactor and heat for 25 minutes. The heating temperature is 190°C. Then weigh 3 parts of glass fiber, 4 parts of talcum powder and 1 part of carbon black by weight and put them into the reactor to continue heating and reacting for 50 minutes. minutes, the heating temperature is 240°C;

[0023] C. Feed the reacted compound into the twin-screw extruder through the constant temperature hopper for processing, and the temperature of the constant temperature hopper is controlled at 77°C;

[0024] D. The twin-screw extruded strips of the twin-screw extruder are air-cooled and then water-cooled in ...

Embodiment 3

[0026] The production method of the polytetrafluoroethylene film of the present embodiment may further comprise the steps:

[0027] A, take by weight 95 parts of polytetrafluoroethylene, 18 parts of polyacrylamide, 10 parts of calcium carbonate, 2 parts of silicon dioxide, 8 parts of polyurethane, and 15 parts of polyimide are put into the reactor;

[0028] B. Feed nitrogen into the reactor and heat for 30 minutes, the heating temperature is 210°C, then weigh 3 parts of glass fiber, 5 parts of talcum powder, and 2 parts of carbon black by weight and put them into the reactor to continue heating and reacting for 60 minutes, the heating temperature is 250°C;

[0029] C. Send the reacted mixture into the twin-screw extruder through the constant temperature hopper for processing, and the temperature of the constant temperature hopper is controlled at 80°C;

[0030] D. The twin-screw extruded strip of the twin-screw extruder is air-cooled and then water-cooled in the temperature c...

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Abstract

The invention discloses a production method of polytetrafluoroethylene film. The production method comprises following steps: A, polytetrafluoroethylene, polyacrylamide, calcium carbonate, silicon dioxide, polyurethane, and polyimide are weighed and are introduced into a reaction vessel; B, nitrogen is introduced into the reaction vessel, heating is carried out, glass fiber, talcum powder, and carbon black are weighed and are introduced into the reaction vessel, and continuous heating is carried out; C, a mixed material obtained via reaction is delivered into a double screw extrusion machine through a constant temperature material hopper for processing; and D, sample strips obtained via double screw extrusion are subjected to wind cooling, are subjected to heating water cooling in a temperature controlled chamber, and are subjected to air drying and cutting so as to obtain a master batch, and the master batch is introduced into a plastic film blowing machine for extrusion film blowingso as to obtain finished products. The production method is capable of increasing the fusion performance of the ingredients greatly, ensuring product density and flatness, avoiding defects, providingproducts with excellent heat resistance, acid resistance, alkaline resistance, wear resistance, light weight, nontoxicity, and odourlessness; and the stretching capacity, the heat conductivity, the corrosion resistance, and the smoothness are improved greatly.

Description

technical field [0001] The invention relates to a polymer material, in particular to a production method of a polytetrafluoroethylene film, which belongs to the technical field of chemical materials. Background technique [0002] Plastic film is a kind of film with a wide range of applications, and with the development of society, there are more and more demands for plastic films in all walks of life. Plastic films are mainly used for packaging and laminating, and have been widely used in food , medicine, chemical industry and other fields have brought great convenience to people's life, and polytetrafluoroethylene has good heat resistance and light weight performance, and the market share is also high, so it promotes polytetrafluoroethylene The development of ethylene film technology, especially the PTFE film has good heat resistance, acid and alkali resistance, friction resistance, light weight, non-toxic, odorless and other advantages, so it develops very rapidly. However...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08L33/26C08L75/04C08L79/08C08K13/04C08K3/26C08K3/36C08K7/14C08K3/34C08K3/04C08J5/18B29B9/06B29C55/28
CPCC08J5/18C08L27/18B29B9/06B29C55/28C08L2205/035C08L2203/16C08K2003/265C08L33/26C08L75/04C08L79/08C08K13/04C08K3/26C08K3/36C08K7/14C08K3/34C08K3/04
Inventor 刘小芳
Owner 镇江春环密封件集团有限公司
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