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Process for recovering polytetrafluorethylene

A polytetrafluoroethylene and recycling method technology, which is applied to the recycling of filled polytetrafluoroethylene and non-filled polytetrafluoroethylene waste, and the recycling field of filled polytetrafluoroethylene, can solve the problem of inability to solve the problem of filling polytetrafluoroethylene waste recycling. problems, high cost, complex process and other problems, to achieve the effect of easy large-scale industrial production, low cost and simple process

Active Publication Date: 2011-06-15
广东新志密封技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polytetrafluoroethylene plastic has excellent properties such as heat resistance, abrasion resistance, weather resistance and chemical corrosion resistance. Therefore, in the industrial, agricultural and petrochemical industries, the use and amount of polytetrafluoroethylene are increasing, but Then there will be a lot of PTFE waste, because PTFE has problems such as difficulty in crushing, especially filled PTFE plastics, because it is filled with metal or fiber, which increases the difficulty of crushing, and the filler It is difficult to separate from the plastic, so most factories today do not recycle PTFE plastic, but dispose of PTFE waste as garbage
Due to the problems of refractory degradation and crushing of PTFE, the incineration of PTFE will produce highly toxic gases such as hydrogen fluoride, which seriously pollutes the environment. Therefore, the current industry regulations require that PTFE waste must be buried deep, which is labor-intensive. time consuming
[0003] At present, methods such as radiation, liquid nitrogen cooling or water-based cooling are generally used at home and abroad for recycling, but the above methods have disadvantages such as complex process, high cost, and environmental pollution, so they are not widely used, and this method still cannot solve the problem of filling Recycling of PTFE waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: a kind of recovery method of filling polytetrafluoroethylene, it may further comprise the steps:

[0024] 1. Put the filled polytetrafluoroethylene waste (hereinafter referred to as waste) into an ultrasonic cleaning machine equipped with deionized water, and perform ultrasonic cleaning at a temperature of 50-80 ° C, and the cleaning time is 1-5 minutes;

[0025] 2. Put the cleaned waste into a dehydrator for dehydration, then put it into an oven, and dry it at a temperature of 50-200°C;

[0026] 3. Put the dried waste in step 2 into a plastic crusher for primary crushing to prepare particles with a particle size of 1 to 3 mm;

[0027] 4. Put the granules obtained in step 3 into an air-cooled pulverizer for secondary pulverization and sieving to prepare a powder with a particle size of 200 to 1000 mesh;

[0028] 5. Mix the powder prepared in step 4 with the new polytetrafluoroethylene powder according to the weight ratio of 100:1~100:100;

[0029] 6. Put...

Embodiment 2

[0033] Embodiment 2: the recovery method of the filling polytetrafluoroethylene described in this embodiment and embodiment 1 is basically the same, and its difference is that, after the secondary pulverization of step 4, the polytetrafluoroethylene powder obtained is mixed with After the PTFE new material is fully mixed in a weight ratio of 100:30 to 100:100, the obtained mixture and filler are fully mixed in a weight ratio of 100:5 to 100:60, and then the mixture is mixed Putting it into a mold and performing the operation of step 5, the tensile strength of the polytetrafluoroethylene composite prepared by the above method is 16MPa-25Mpa, and the elongation at break is 250%-450%.

[0034] The above filler is one or more of graphite, bronze powder, carbon fiber, molybdenum disulfide or titanium dioxide.

[0035] The above embodiments are also applicable to the recovery of non-filled PTFE.

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Abstract

The invention provides a recycling method for PTFE, which comprises procedures as follows: (1) filled PTFE waste is washed in an ultrasonic way; (2) after being dehydrated, the PTFE waste is dried; (3) the PTFE waste is made into the particles with a diameter of 1 to 3mm; (4) the PTFE waste is crashed and screened again for the purpose of being made into powder with a particle size ranging from 200 to 1000 meshes; (5) the powder is mixed with stuffing evenly; (6) the mixed powder is put into a mould to be heated; afterwards, the mixed powder is cooled to room temperature to be demoulded; and (7) after being demoulded, the PTFE waste is put into a post forming mould; the mould is put into a sintering furnace to be sintered at a sintering temperature of 360 to 390 DEG C; after the mould is kept at a temperature of 360 to 390 DEG C for 3 to 10h, the mould is pressurized to 15 to 30MPa; and then, the mould is cooled by radiation to the room temperature to be demoulded, thus obtaining finished products. The recycling method for PTFE has simple technology and low cost and is easy for large-scale industrial production. In addition, the recycling method for PTFE fills in the gap of the recycling technology of PTFE.

Description

technical field [0001] The invention belongs to the field of chemistry and chemical engineering, and in particular relates to a recycling method for filled polytetrafluoroethylene and non-filled polytetrafluoroethylene waste, in particular to a recycling method for filled polytetrafluoroethylene. Background technique [0002] Polytetrafluoroethylene plastic has excellent properties such as heat resistance, abrasion resistance, weather resistance and chemical corrosion resistance. Therefore, in the industrial, agricultural and petrochemical industries, the use and amount of polytetrafluoroethylene are increasing, but Then there will be a lot of PTFE waste, because PTFE has problems such as difficulty in crushing, especially filled PTFE plastics, because it is filled with metal or fiber, which increases the difficulty of crushing, and the filler It is difficult to separate from the plastic, so most factories today do not recycle PTFE plastic and instead dispose of PTFE waste a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B17/00B29B17/04B29B7/00B29C51/00B29C71/02B29B13/06B29B13/00B29K27/06
CPCY02P70/10Y02W30/52Y02W30/62
Inventor 周完成
Owner 广东新志密封技术有限公司