CN101074500A

CN101074500A - Method for producing polytef flocks

Info

Publication number: CN101074500A
Application number: CNA2006100266496A
Authority: CN
Inventors: 黄斌香; 黄磊; 苏韵芳; 徐欧
Original assignee: LINGQIAO ENVIRONMENTAL PROTECTION EQUIPMENT FACTORY CO Ltd SHANGHAI
Current assignee: SHANGHAI JINYOU FLUORINE MATERIALS CO., LTD.
Priority date: 2006-05-18
Filing date: 2006-05-18
Publication date: 2007-11-21
Anticipated expiration: 2026-05-18
Also published as: CN101074500B

Abstract

This invention relates to a production process for Short fiber PTFE. The raw materials in this invention is 100% PTFE, the processing equipment includes spiral extrusion machine, calendar, stretching machine, heating tensile machine, slitter, twisting machines, extrusion tensile machine, curling machine, a cutting machine and opener. The process for producing PTFE short fiber is as follows: crash the PTFE in the spiral extrusion machine, calendar, stretch in stretching machine, stretch in the heating tensile machine, stretch in the heating tensile machine again, sub-cut in the slitter, twisting into beam in the twisting machines, rough and fine rafah in the extrusion tensile machine, stretch in the heating tensile machine, curl in curling machine, cut in the cutting machine, open by the opener. The PTFE short fiber produced by this invention can be used as PTFE thorn felt filter and bags in the bags filter, which longer the duration of use.

Description

A kind of manufacture method of polytef flocks

Technical field:

The present invention relates to a kind of manufacture method of fiber, particularly relate to a kind of manufacture method of polytef flocks.

Background technology:

Sack cleaner is widely used in industry, be mainly used in flue gas to discharging in the industrial production or surrounding enviroment take place, the processing of dust, removed the pollution of environment, purified air, it has played active and effective effect, the work of sack cleaner mainly is to rely on the cloth bag of sack cleaner to filter flue gas, dust, and the cloth bag filtrate of sack cleaner has determined the cloth bag of sack cleaner to various flue gases, the adaptability of dust, and service life, at present, the cloth bag filtrate of sack cleaner is mainly selected for use aromatic polyamide fibre, polyphenylene sulfide fibre, poly-aromatic imide fiber and glass fibre etc., the characteristic of aromatic polyamide fibre is that proportion is 1.38g/cm ³, limited oxygen index 29, not spontaneous combustion is combustion-supporting, stands the operating temperature about 200 ℃ under drying condition, when operating temperature when moisture and chemical composition are arranged will reduce, especially at SO ₂Exist, when having moisture, can be corroded, strength retention ratio reduces; Polyphenylene sulfide fibre is that temperature tolerance and chemical stability are better, and its anti-flammability, DIMENSIONAL STABILITY are also better in addition, and the short time can be stood 190 ℃ high temperature, can resist the chemical attack of multiple acid, alkali and oxidant, can hydrolysis, and its shortcoming is to the oxidant sensitivity; Poly-aromatic imide fiber is high temperature resistant, can be exposed to continuously in 240 ℃, and resistance to chemical attack, good permeability, its shortcoming is a hydrolysis not, and PPS compares with polyphenylene sulfide fibre, and price is higher; Glass fibre is an inanimate matter, and main component is Sio ₂Can be high temperature resistant, DIMENSIONAL STABILITY is good, resistance to chemical attack, can be under 260 ℃ high temperature expose continuously, but, take a broad view of above-mentioned several filtrate commonly used and all have certain defective in varying degrees the corrosion-resistant of hydrofluoric acid, highly basic, can not tackle the processing under particle concentration height, flue gas acid gas-containing, the toxic organic situation in vapour content height, the flue gas in the dust, particularly flue-gas temperature height and fluctuation, flue gas all sidedly.

In sum, along with industrial development, the generation of flue gas, dust, variation has also taken place in its composition, character, in order to obtain a comparatively ideal results, must seek a kind of cloth bag filtrate of sack cleaner of renewal.

Polytetrafluoroethylene (PTFE) is big molecule linear structure, does not almost have side chain, and the molecule both sides all are the C-F key greatly, highly stable chemical bond.Fluorine atom gets up the carbon atom shielding protection on the main chain; strand is difficult to be destroyed; so have best corrosion resistance and heat resistance; can resist oxidation and surface contaminants; do not become fragile; the macromolecular surface free energy of polytetrafluoroethylene (PTFE) is very low; not adhesiveness and lowest friction coefficient with height; its crystalline melt point is 327 ℃, can use in-210 ℃ of-260 ℃ of scopes for a long time, and itself does not rupture polytetrafluoroethylene (PTFE); do not burn; its " limited oxygen index " (LOI) up to 95%, polytetrafluoroethylene (PTFE) has extremely strong hydrolytic resistance simultaneously, and is all better than the anti-vapour permeability of any material.

Because polytetrafluoroethylene (PTFE) has aforesaid every excellent specific property, with it is that raw material is processed into polytetrafluoroethylene fibre, have high temperature resistant, acid and alkali resistance burn into oxidation resistance by force, characteristic that can not hydrolysis, compare with above-mentioned several high-temperature fibres and to have unrivaled superiority, very be suitable for the processing of various flue gases, dust.As if but there is difficult processability in polytetrafluoroethylene (PTFE), make that making polytetrafluoroethylene fibre becomes a very thing of difficulty, also is difficult to become the cloth bag filtrate of sack cleaner.

Summary of the invention:

The objective of the invention is to provide a kind of manufacture method of polytef flocks, behind the polytef flocks that obtains with the method, can become the filtrate that is used to make the sack cleaner cloth bag.

The present invention is achieved in that the raw material that the present invention selects is 100% polytetrafluoroethylene (PTFE) to achieve the above object, the process equipment that uses has spiral extruder, calender, stretching-machine, add heat stretching machine, cutting machine, twisting mill, the extrusion stretching machine, crimping machine, cutting machine and opener, at first dropping into polytetrafluoroethylene (PTFE) at spiral extruder pushes, the operating temperature of spiral extruder is 325～420 ℃, rotating speed is 3～100r/min, behind spiral extruder, enter the calender calendering, the operating temperature of calender is 10～50 ℃, linear velocity is 0.5～1m/min, then entering stretching-machine stretches, the stretching-machine operating temperature is 10～50 ℃, linear velocity is 0.3～1.2m/min, then enter and add heat stretching machine heating stretching, adding the heat stretching machine operating temperature is 130～190 ℃, linear velocity is 0.4～1.5m/min, after enter again and add heat stretching machine heating and stretch, adding the heat stretching machine operating temperature is 190～220 ℃, linear velocity is 0.5～1.1m/min, then cut by cutting machine, the cutting machine linear velocity is 1～2m/min, the back is by twisting mill twisting bunchy, the twisting mill linear velocity is 1.1～2.1m/min, then entering the extrusion stretching machine implements rough, extrusion stretching machine operating temperature is 30～80 ℃, linear velocity is 4～6m/min, after enter the extrusion stretching machine again and carefully draw, extrusion stretching machine operating temperature is 80～120 ℃, linear velocity is 6～15m/min, then enter and add heat stretching machine heating stretching, adding the heat stretching machine operating temperature is 160～265 ℃, linear velocity is 5～15m/min, then curl by crimping machine, the crimping machine operating temperature is 200～250 ℃, linear velocity is 2～4m/min, after enter cutting machine and cut off, by the opener shredding, promptly make the polytef flocks finished product at last.

Because the present invention is that 100% polytetrafluoroethylene (PTFE) is implemented extruding to raw material, calendering, stretch, add hot-stretch, add hot-stretch, cut, the twisting bunchy, rough extrusion stretching, thin pultrusion is pressed and is stretched, add hot-stretch, curl, the manufacture process of cut-out and shredding, finish at last and obtain the polytef flocks finished product, the manufacturing of polytef flocks is achieved, polytef flocks can pass through needling process, the polytetrafluoroethylpunched punched felt filtrate is made in acupuncture on base cloth, be made into cloth bag, can use on sack cleaner, this sack cleaner is suitable for existing various character, the flue gas of composition, the processing of dust, and can also use in waste incineration, high temperature such as hospital refuse burning, in the processing operating mode of the flue gas that corrosivity is strong, simultaneously, this filter bag has service life preferably.

Description of drawings:

The manufacture method of polytef flocks of the present invention is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is the schematic diagram of the manufacture method of a kind of polytef flocks of the present invention.

The specific embodiment:

Below in conjunction with accompanying drawing embodiments of the invention are described in detail.

Referring to Fig. 1, the step of manufacturing of a kind of polytef flocks of the present invention is as follows:

1,100% polytetrafluoroethylene (PTFE) is dropped into spiral extruder and push, the operating temperature of spiral extruder is that 325～420 ℃, rotating speed are 3～100r/min;

2, enter calender calendering, the operating temperature of calender is that 10～50 ℃, linear velocity are 0.5～1m/min;

3, enter stretching-machine and stretch, the stretching-machine operating temperature is that 10～50 ℃, linear velocity are 0.3～1.2m/min;

4, enter and add heat stretching machine heating and stretch, adding the heat stretching machine operating temperature and be 130～190 ℃, linear velocity is 0.4～1.5m/min;

5, enter and add heat stretching machine heating and stretch, the stretching-machine operating temperature is that 190～220 ℃, linear velocity are 0.5～1.1m/min;

6, cut by cutting machine, the cutting machine linear velocity is 1～2m/min;

7, by twisting mill twisting bunchy, the twisting mill linear velocity is 1.1～2.1m/min;

8, enter the extrusion stretching machine and implement roughly, extrusion stretching machine operating temperature is that 30～80 ℃, linear velocity are 4～6m/min;

9, enter the extrusion stretching machine and carefully draw, extrusion stretching machine operating temperature is that 80～120 ℃, linear velocity are 6～15m/min;

10, enter and add heat stretching machine heating and stretch, the stretching-machine operating temperature is that 160～265 ℃, linear velocity are 5～15m/min;

11, curled by crimping machine, the crimping machine operating temperature is that 200～250 ℃, linear velocity are 2～4m/min;

12, entering cutting machine cuts off;

13, at last by the opener shredding, promptly finish the manufacturing of polytef flocks finished product.

Claims

1. the manufacture method of a polytef flocks, the raw material that the present invention selects is 100% polytetrafluoroethylene (PTFE), the process equipment that uses has spiral extruder, calender, stretching-machine, add heat stretching machine, cutting machine, twisting mill, the extrusion stretching machine, crimping machine, cutting machine and opener, at first dropping into polytetrafluoroethylene (PTFE) at spiral extruder pushes, the operating temperature of spiral extruder is 325～420 ℃, rotating speed is 3～100r/min, behind spiral extruder, enter the calender calendering, the operating temperature of calender is 10～50 ℃, linear velocity is 0.5～1m/min, then entering stretching-machine stretches, the stretching-machine operating temperature is 10～50 ℃, linear velocity is 0.3～1.2m/min, then enter and add heat stretching machine heating stretching, adding the heat stretching machine operating temperature is 130～190 ℃, linear velocity is 0.4～1.5m/min, after enter again and add heat stretching machine heating and stretch, adding the heat stretching machine operating temperature is 190～220 ℃, linear velocity is 0.5～1.1m/min, then cut by cutting machine, the cutting machine linear velocity is 1～2m/min, the back is by twisting mill twisting bunchy, the twisting mill linear velocity is 1.1～2.1m/min, then entering the extrusion stretching machine implements rough, extrusion stretching machine operating temperature is 30～80 ℃, linear velocity is 4～6m/min, entering the extrusion stretching machine more carefully draws, extrusion stretching machine operating temperature is 80～120 ℃, linear velocity is 6～15m/min, then enter and add heat stretching machine heating stretching, adding the heat stretching machine operating temperature is 160～265 ℃, linear velocity is 5～15m/min, then curl by crimping machine, the crimping machine operating temperature is 200～250 ℃, linear velocity is 2～4m/min, after enter cutting machine and cut off, by the opener shredding, promptly make the polytef flocks finished product at last.