Fusible polytetrafluoroethylene pipe and its preparation method
A polytetrafluoroethylene pipe and polytetrafluoroethylene technology are applied in the field of fusible polytetrafluoroethylene pipes and their preparation, which can solve the problems of decreased strength of PFA pipes, peeling off of PFA layers, affecting service life and the like, and achieve increased strength , the effect of reducing shrinkage and improving service life
Active Publication Date: 2017-11-10
SHANGHAI JINYOU FLUORINE MATERIALS
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Problems solved by technology
[0004] First, as the temperature increases, especially after reaching 200°C, the strength of PFA pipes decreases significantly, and at 260°C, its strength is almost close to zero
[0005] Second, the thermal expansion coefficient of PFA is much higher than that of metal or other materials. Therefore, in the process of alternating cold and heat, the temperature change will cause a certain thermal stress, and the shrinkage rate of the PFA layer is much larger than that of other materials such as metal. It is easy to cause the PFA layer to peel off and affect the service life
Method used
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[0041] Preferred embodiments of the present invention will be described in detail below in order to better understand the purpose, features and advantages of the present invention. It should be understood that these embodiments are not intended to limit the scope of the present invention, but only to illustrate the essence of the technical solution of the present invention.
[0042] Glossary
[0043] The ultra-fine short fiber in the present invention refers to the fiber whose long-term temperature resistance is above 260°C, the melting temperature is above 300°C, the fineness is 0.5-5den, the cutting length is 0.5-5mm, and the strength is above 300MPa, which includes but Not limited to PTFE, stainless steel fiber, carbon fiber, glass fiber, ceramic fiber and other high temperature resistant fibers.
[0044] After extensive and in-depth research, the inventor first developed an enhanced, high-temperature-resistant and corrosion-resistant fusible polytetrafluoroethylene pipe. ...
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Abstract
The invention discloses a polyfluoroalkoxy pipe and a preparation method thereof. The polyfluoroalkoxy pipe consists of polyfluoroalkoxy particles; the polyfluoroalkoxy particles are formed by granulating solid rods, and the solid rods are formed by adding superfine staple fibers into polyfluoroalkoxy under a molten state to form a mixture and then extruding the mixture by an extruder. The method comprises the step of preparing the superfine staple fibers, the step of preparing the polyfluoroalkoxy particles and the step of preparing the polyfluoroalkoxy pipe. The polyfluoroalkoxy (PFA) pipe disclosed by the invention not only can be processed by a processing method of thermoplastic forming but also can be greatly improved in strength and toughness; meanwhile, the polyfluoroalkoxy pipe has the advantages that the shrinkage rate of the material is reduced, and the like, therefore the service life of the pipe can be greatly prolonged, and the use cost is reduced.
Description
technical field [0001] The invention relates to the field of pipes, in particular to a fusible polytetrafluoroethylene pipe and a preparation method thereof. Background technique [0002] Fusible polytetrafluoroethylene (PFA) pipe has excellent high and low temperature resistance characteristics, and can be used for a long time under the condition of -20 ~ 200 ℃. It has good chemical stability. It only reacts with fluorine vapor and alkali metal at high temperature, and does not react with all other concentrated and dilute inorganic organic acids, alkalis and esters. Low surface friction coefficient, water repellent, oil repellent, no fouling inside and outside the pipe wall. Non-toxic, non-flammable, etc., with high transparency, the lowest light refractive index among all plastics, easy secondary processing, self-sealing, self-welding, and flanging. It can be widely used in semiconductor manufacturing equipment, heat exchangers, steam piping, high-purity reagent delivery...
Claims
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IPC IPC(8): F16L9/127F16L11/14B29C47/00
CPCB29C48/0018B29C48/09F16L9/127F16L11/14
Inventor 黄斌香侯成成顾榴俊
Owner SHANGHAI JINYOU FLUORINE MATERIALS