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Method for producing polytetrafluoroethylene regenerated turned strip

A technology of polytetrafluoroethylene and production method, which can be applied to other household appliances, flat products, household appliances, etc., can solve problems such as inability to apply, and achieve the effect of excellent dielectric properties

Inactive Publication Date: 2012-12-12
HUZHOU NINGXIN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing PTFE turning plates, films, and belts are all made of good PTFE materials, and the recycled PTFE materials cannot be used in PTFE turning plates, films, and belts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method for regenerated polytetrafluoroethylene powder, comprising the following steps:

[0034] 1. Impurity removal treatment, cutting PTFE waste, cleaning, drying, and sorting out impurities;

[0035] 2. For powder grinding, cut the above-mentioned massive PTFE waste into strips, and the filaments can also be crushed into granules, and finely ground into powder with emery wheels;

[0036] 3. Sintering. Dry the polytetrafluoroethylene powder obtained above evenly in an oven, set the temperature of the oven at 100-200°C for drying, and then sinter at a constant temperature of 350-380°C for 18 hours;

[0037] 4. Cut into strips, cut the sintered powder into strips with a strip cutter, and cheap dry fine grinding;

[0038] 5. Grind again, use strip-shaped block powder, and use a dry fine grinder to grind into a powder with a size of 450-600 microns;

[0039] 6. Sieve, and then sieve with a steel sieve to obtain powder with uniform particles of 450~600 mesh...

Embodiment 2

[0042] Obtained polytetrafluoroethylene regenerated powder of the present invention by above-mentioned embodiment 1 technique, the technique that prepares turning bar with it is as follows:

[0043] 1. Clean and install abrasives;

[0044] 2. Add the prepared powder evenly into the mold cavity, and add an appropriate amount of powder according to the required size;

[0045] 3. Adopt self-controlled two-head press, press with constant pressure in two directions at the same time every 30 seconds, which is conducive to the air discharge of the powder and compaction on time;

[0046] 4. After 6 hours of constant pressure, stop when the pressure is 35 mp per square centimeter;

[0047] 5. Do not loosen, continue to hold the pressure with constant force, and take it after two hours;

[0048] 6. After taking out the billet, put it in a constant temperature box at 25-30°C for 24 hours to release the pressure and stress;

[0049] 7. Put the billet after constant temperature into the...

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Abstract

The invention belongs to the field of recycling of polytetrafluoroethylene scrap and particularly relates to a method for producing a polytetrafluoroethylene regenerated turned strip, comprising the following steps: (1) adding prepared powder into a die cavity uniformly, adding polytetrafluoroethylene regenerated powder according to the needed size, and pressurizing by an automatic-control double-head pressing machine; (2) taking out a blank, and putting into a thermotank for thermostating; (3) putting the thermostated blank into a sintering furnace with the automatic-control thermostating function, and sintering; (4) opening the sintering furnace, taking out the blank for later use after the blank is fully cooled, feeding into a turning machine, and turning into plates; and (5) putting the plates into a strip separating machine, and separating strips. The performance of the polytetrafluoroethylene regenerated turned strip produced by adopting the method basically meets the requirement of the primary powder turned strip, and the polytetrafluoroethylene regenerated turned strip has excellent dielectric performance, can not age and has a smooth impurity-free surface. The detection of the Shanghai Plastics Research Institute shows that all performance indexes of the polytetrafluoroethylene regenerated turned strip are basically close to those of the primary powder turned strip.

Description

technical field [0001] The invention relates to the field of recycling polytetrafluoroethylene wastes, in particular to a production method of recycled polytetrafluoroethylene turning strips. Background technique [0002] PTFE plastic is an engineering plastic with excellent performance. It has good self-lubrication performance, low friction coefficient, high and low temperature resistance, corrosion resistance, good insulation performance and non-stickiness. It is widely used in machinery, electronics, petroleum, Chemical, food, light industry and other industries. Due to the non-natural degradability of PTFE plastics, discarded PTFE plastics will cause great pollution to the environment. Therefore, how to recycle polytetrafluoroethylene waste and turn waste into treasure has become a research direction. [0003] Existing polytetrafluoroethylene waste regeneration technology such as Chinese invention patent (notification number is 1048267) discloses a kind of recycled pol...

Claims

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Application Information

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IPC IPC(8): B29D7/00B29B9/00
Inventor 章宁
Owner HUZHOU NINGXIN NEW MATERIAL TECH
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