CN104831396A - Processing method for high-strength polytetrafluoroethylene fiber - Google Patents

Abstract

The invention especially relates to a processing method for a high-strength polytetrafluoroethylene fiber, which belongs to the field of processing technology for plastic filaments. A raw material used in the invention is suspension polytetrafluoroethylene resin; and equipment used by the method comprises a pressing machine, a sintering furnace, a filament manufacturing machine, a setting machine and a drawing machine. The processing method for the high-strength polytetrafluoroethylene fiber can produce a filament without any auxiliary agent and with fine and closely-woven cross section texture, high tensile strength and good rigidity; and the produced high-strength polytetrafluoroethylene fiber is applicable to the chemical industry, the oil refinery, the iron and steel industry for recovery and filtering of waste and gas-liquid separation and can perfectly overcome problems in environmental protection.

Description

High strength polytetrafluoroethylfiber fiber processing method

Technical field

The invention belongs to the processing technology of plastic optical fibre, particularly a kind of high strength polytetrafluoroethylfiber fiber processing method.

Background technology

At present, the line that dispersed polytetrafluoroethylresin resin is made is adopted, owing to adding auxiliary agent, after removal auxiliary agent, containing a large amount of micropores on line, line reaches flexibility, but does not have rigidity, dispersed polytetrafluoroethylresin is Fibrotic particle, extrude formation longitudinal fiber by auxiliary agent, there is longitudinal tensile strength, laterally easily ftracture, fluffing, loses the characteristic of polytetrafluoroethylmaterial material not viscosity and low-friction coefficient.The auxiliary agent added in the process making silk mostly is inflammable solvent naphtha, paraffin, gasoline etc., so manufacturing cost high yield is low, and in removal auxiliary agent process, also can cause environmental pollution, inflammable, cause potential safety hazard.In addition, the silk made can not meet the tensile strength requirement of loom following process.

Summary of the invention

The object of the invention is to overcome above-mentioned technical deficiency, provide a kind of process not need auxiliary agent, low cost of manufacture, the tensile strength of silk can meet the high strength polytetrafluoroethylfiber fiber processing method of following process requirement.

The technical scheme that technical solution problem of the present invention adopts is: the raw material that high strength polytetrafluoroethylfiber fiber processing method adopts is suspension injecting tetrafluoroethylene resin, the equipment adopted is press, sintering furnace, wire producing machine, setting machine, wire drawing machine, is characterized in that the processing method that it adopts is as follows:

1, the polyflon chosen is placed 24 hours at 10 ~ 25 DEG C of temperature;

2, the polytetrafluoroethylene (PTFE) measured, join in press mould with 200 ~ 500Kg/cm ²the pressure of unit is suppressed, pressurize 10 ~ 30 minutes, and obtained blank, places 20 ~ 30 hours, at normal temperatures to eliminate internal stress;

3, the blank after elimination internal stress is put into sintering furnace to sinter, the temperature of setting is 20 ~ 300 ~ 327 ~ 360 ~ 327 ~ 20 DEG C, the blank of obtained degree of crystallinity 50 ~ 80%;

4, by the blank of degree of crystallinity 50 ~ 80% in wire producing machine with the thrust of pressure 15 ~ 50 MPa, make the crin with high rigidity at 50 ~ 300 DEG C of temperature;

5, crin is put into wire drawing machine and carry out stretching of heating, through heating for multiple times, stretching, process is crin → heating → stretching → heating → stretching → heating → stretching → heating → acceptable fiber; The temperature arranged in heating and drawing process and draw roll pass speed and are: at a, temperature 15 ~ 100 DEG C, 200 ~ 300 DEG C, 500 ~ 100 DEG C situations, corresponding employing draw roll rotating speed is 10 ~ 25 revs/min, 30 ~ 50 revs/min, 20 ~ 70 revs/min; At b, temperature 20 ~ 200 DEG C, 300 ~ 450 DEG C, 450 ~ 80 DEG C situations, corresponding employing draw roll rotating speed is 10 ~ 30 revs/min, 35 ~ 60 revs/min, 25`80 rev/min; At c, temperature 50 ~ 150 DEG C, 150 ~ 400 DEG C, 400 ~ 150 DEG C situations, the corresponding draw roll rotating speed adopted is 10 ~ 35 revs/min, 40 ~ 70 revs/min, 30 ~ 90 revs/min;

6, shaped on setting machine by stretched qualified fiber, the fiber after qualified after testing carries out winding packaging, and qualified fibre section is elliptical shape.

The invention has the beneficial effects as follows: high strength polytetrafluoroethylfiber fiber processing method can produce do not add any auxiliary agent have that cross section is of close texture, tensile strength is high, the fiber of good rigidly, the Litters such as its adaptable chemical industry, oil plant, steel industry reclaim and filter, gas-liquid separation, solves environmental issue well.

Detailed description of the invention

Below in conjunction with embodiment, the present invention is illustrated.

Embodiment, high strength polytetrafluoroethylfiber fiber processing method is: adopt suspension injecting tetrafluoroethylene resin, the polyflon chosen is placed 24 hours at 10 ~ 25 DEG C of temperature, the polyflon of placement after 24 hours is sent in the mould of press, with 200 ~ 500kg/cm through metering ²the pressure of unit is suppressed, and through pressurize 10 ~ 30 minutes, obtained blank, placed 20 ~ 30 hours at normal temperatures by blank, make it eliminate internal stress.Then the blank after elimination internal stress is put into sintering furnace to sinter, the temperature that sintering process is arranged is 20 ~ 300 ~ 327 ~ 360 ~ 327 ~ 20 DEG C, the blank of obtained degree of crystallinity 50 ~ 80%.The blank that will obtain degree of crystallinity 50 ~ 80% with the thrust of pressure 15 ~ 50 MPa, makes the crin with high rigidity at 50 ~ 300 DEG C of temperature in wire producing machine.Crin is put into wire drawing machine to carry out heating, stretching, need the heating of multi-step, stretching, its technical process is crin → heating → stretching → heating → stretching → heating → stretching → heating → acceptable fiber.The temperature arranged in heating and drawing process and the draw roll rotating speed of corresponding wire drawing machine are: a, temperature 15 ~ 100 →, corresponding employing draw roll rotating speed is 10 ~ 25 revs/min, 30 ~ 50 revs/min, 20 ~ 70 revs/min in 200 ~ 300 DEG C, 500 ~ 100 DEG C situations; At b, temperature 20 ~ 200 DEG C, 300 ~ 450 DEG C, 450 ~ 80 DEG C situations, corresponding employing draw roll rotating speed is 10 ~ 30 revs/min, 35 ~ 60 revs/min, 25 ~ 80 revs/min; At c, temperature 50 ~ 150 DEG C, 150 ~ 400 DEG C, 400 ~ 150 DEG C situations, the corresponding draw roll rotating speed adopted is 10 ~ 35 revs/min, 40 ~ 70 revs/min, 30 ~ 90 revs/min.

Shaped on setting machine by stretched qualified fiber, the fiber after qualified after testing carries out winding packaging, and qualified fibre section is elliptical shape.

The technical parameter of the polytetrafluoroethylene fibre obtained is as following table;

No.	Area (mm 2)	Maximum, force (N)	Draw and stretch intensity (MPa)	Elastic modelling quantity (MPa)	Yield strength (MPa)
						1	0.068	15.455	227.284	42.770	96.913
2	0.068	15.867	233.341	37.542	78.453
						Mean value	0.068	15.33	230.3	40.156	87.683.019

Claims (1)

1. the raw material that high strength polytetrafluoroethylfiber fiber processing method adopts is a suspension injecting tetrafluoroethylene resin, and the equipment of employing is press, sintering furnace, wire producing machine, setting machine, wire drawing machine, it is characterized in that the processing method that it adopts is as follows:

1, the polyflon chosen is placed 24 hours at 10 ~ 25 DEG C of temperature;

2, the polytetrafluoroethylene (PTFE) measured, join in press mould with 200 ~ 500Kg/cm ²the pressure of unit is suppressed, pressurize 10 ~ 30 minutes, and obtained blank, places 20 ~ 30 hours, at normal temperatures to eliminate internal stress;

3, the blank after elimination internal stress is put into sintering furnace to sinter, the temperature of setting is 20 ~ 300 ~ 327 ~ 360 ~ 327 ~ 20 DEG C, the blank of obtained degree of crystallinity 50 ~ 80%;

4, by the blank of degree of crystallinity 50 ~ 80% in wire producing machine with the thrust of pressure 15 ~ 50 MPa, make the crin with high rigidity at 50 ~ 300 DEG C of temperature;

5, crin is put into wire drawing machine and carry out stretching of heating, through heating for multiple times, stretching, process is crin → heating → stretching → heating → stretching → heating → stretching → heating → acceptable fiber; The temperature arranged in heating and drawing process and draw roll pass speed and are: at a, temperature 15 ~ 100 DEG C, 200 ~ 300 DEG C, 500 ~ 100 DEG C situations, corresponding employing draw roll rotating speed is 10 ~ 25 revs/min, 30 ~ 50 revs/min, 20 ~ 70 revs/min; At b, temperature 20 ~ 200 DEG C, 300 ~ 450 DEG C, 450 ~ 80 DEG C situations, corresponding employing draw roll rotating speed is 10 ~ 30 revs/min, 35 ~ 60 revs/min, 25`80 rev/min; At c, temperature 50 ~ 150 DEG C, 150 ~ 400 DEG C, 400 ~ 150 DEG C situations, the corresponding draw roll rotating speed adopted is 10 ~ 35 revs/min, 40 ~ 70 revs/min, 30 ~ 90 revs/min;

6, shaped on setting machine by stretched qualified fiber, the fiber after qualified after testing carries out winding packaging, and qualified fibre section is elliptical shape.