CN108908923A - A kind of polyfluortetraethylene pipe technique - Google Patents
A kind of polyfluortetraethylene pipe technique Download PDFInfo
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- CN108908923A CN108908923A CN201810739359.9A CN201810739359A CN108908923A CN 108908923 A CN108908923 A CN 108908923A CN 201810739359 A CN201810739359 A CN 201810739359A CN 108908923 A CN108908923 A CN 108908923A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000002156 mixing Methods 0.000 claims abstract description 36
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 26
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 26
- 238000001125 extrusion Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims abstract description 10
- 238000010348 incorporation Methods 0.000 claims abstract description 10
- 210000001161 mammalian embryo Anatomy 0.000 claims abstract description 10
- 238000003860 storage Methods 0.000 claims abstract description 4
- 238000005245 sintering Methods 0.000 claims description 73
- 238000001035 drying Methods 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 19
- 239000011347 resin Substances 0.000 claims description 15
- 229920005989 resin Polymers 0.000 claims description 15
- 239000006185 dispersion Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- 239000002826 coolant Substances 0.000 claims description 9
- 238000004781 supercooling Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 8
- 230000005484 gravity Effects 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims 1
- 239000005977 Ethylene Substances 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 5
- 230000008602 contraction Effects 0.000 abstract description 4
- 238000002955 isolation Methods 0.000 abstract description 3
- 239000004809 Teflon Substances 0.000 description 7
- 229920006362 Teflon® Polymers 0.000 description 7
- 239000004615 ingredient Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920006361 Polyflon Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/06—Making preforms having internal stresses, e.g. plastic memory
- B29C61/08—Making preforms having internal stresses, e.g. plastic memory by stretching tubes
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of polyfluortetraethylene pipe techniques, include the following steps：Mixing：PTFE and extrusion aid are mixed by mixing machine, incorporation time 10min-20min, mixing temperature is no more than 19 DEG C；Storage：It is stored 24 hours or more under conditions of 25 DEG C -30 DEG C after mixing；It is preforming：By preforming mechanism embryo, compression speed 50mm/min, pressure is controlled in 0-3MPa；It pushes：It is pushed by upright push machine, material chamber temperature when pushing is controlled at 30 DEG C -50 DEG C.Polyfluortetraethylene pipe produced by the invention has the characteristic of heat shrinkable, therefore the appearance of other workpiece can be closely coated on, the workpiece is set to have corrosion-resistant, electrical isolation and antistick characteristic, it can be widely used for the industry such as electrical, chemical industry, machinery, printing, FIFE heat-shrinkable tube maximum contraction rate is greater than 75%, the problem of polyfluortetraethylene pipe heat shrinkable for solving prior art production is poor, can not effectively improve the corrosion-resistant of workpiece, electrical insulating property and antistick characteristic.
Description
Technical field
The present invention relates to technical field of plastic, specially a kind of polyfluortetraethylene pipe technique.
Background technique
Polytetrafluoroethylene (PTFE) is referred to as " kings of plastics ", with colourless, nontoxic, temperature resistant range is wide, chemical inertness and friction are
A variety of excellent properties such as small are counted, are become now centered on the industry such as automobile, national defence, machinery, chemical industry, electronics, building
The all indispensable important materials of all branchs of industry.
Polyfluortetraethylene pipe is to make steel pipe and plastics using special processing process using the plunger work extruding pipe of high quality
Pipe is combined closely, and positive pressure 1.6Mpa, negative pressure can be born：77Kpa；Can in -60 DEG C~+260 DEG C normal use, have reliable
Excellent corrosion resistance.The strong corrosive air-liquid body under high temperature is conveyed, this is that other pipeline institutes are irreplaceable.
A kind of polytetrafluoroethylhose hose manufacturing process of the disclosure of the invention of Patent No. CN102416701A, it is characterised in that
Include the following steps：1）Ingredient；1.1）With the polyflon material after screening, by weight 1000g：200g polytetrafluoroethyl-ne
The ratio of olefine resin and 200 ﹟ gasoline carries out mixing, and parks 24 hours；1.2）Also ingredient can be rocked by hand and makes the tree of immersion oil
Rouge particle is uniformly mixed；1.3）Mixed ingredient is put on blender, revolving speed be 0~100r/min, rotate 20 minutes, such as
There is viscosity phenomenon, can have a power failure within 10 minutes under gently vibration, be further continued for mixing to the stipulated time；1.4）It is small that 48 are placed at 25 ± 5 DEG C of room temperature
When, in case slug press.The polyfluortetraethylene pipe heat shrinkable of prior art production is poor, can not effectively improve the corrosion resistant of workpiece
Erosion, electrical insulating property and antistick characteristic, for this purpose, it is proposed that a kind of polyfluortetraethylene pipe technique.
Summary of the invention
The purpose of the present invention is to provide a kind of polyfluortetraethylene pipe techniques, to solve mentioned above in the background art ask
Topic.
To achieve the above object, the present invention provides the following technical solutions：A kind of polyfluortetraethylene pipe technique, including walk as follows
Suddenly：
（1）Mixing：PTFE and extrusion aid are mixed by mixing machine, incorporation time 10min-20min, mixing temperature is not
More than 19 DEG C；
（2）Storage：It is stored 24 hours or more under conditions of 25 DEG C -30 DEG C after mixing；
（3）It is preforming：By preforming mechanism embryo, compression speed 50mm/min, pressure is controlled in 0-3MPa；
（4）It pushes：It is pushed by upright push machine, material chamber temperature control when pushing is at 30 DEG C -50 DEG C, die temperature control
System is at 50 DEG C -60 DEG C；
（5）It is dry：The material after pushing is dried at 210 DEG C or less by dry and sintering furnace, drying time control exists
2h-3h；
（6）Sintering：After the completion of drying, dry and sintering furnace carries out indirect sintering, 60 DEG C/h of heating rate, 375 DEG C of ± 5 DEG C of heat preservations
4h, then continuous sintering are cooled down after the completion of sintering；
（7）Heat treatment：The process being quenched after the good pipe of drying and sintering is further sufficiently sintered at high temperature again, temperature
390 DEG C ± 2 DEG C, -5 DEG C of coolant liquid；
（8）Inflation：At 310 DEG C or so, 0.98MPa or less compressed gas, blow-up ratio 200%- are filled with by inflation machine
400%；
（9）It is cooling：Finished product is obtained through supercooling after the completion of inflation, cooling zone temperature is controlled at 300 DEG C or less.
Preferably, the step（1）The group of the formula number of middle teflon rod is divided into：Dispersion PTFE resin
100 parts, 20-22 parts of extrusion aid.
Preferably, the step（4）Middle pushing rate becomes smaller with the increase of caliber, accelerates with becoming smaller for wall thickness.
Preferably, the step（5）At 100 DEG C -250 DEG C, preheating zone temperature is controlled 250 for middle dry section temperature control
DEG C -330 DEG C, sintering zone temperature is controlled at 380 DEG C -420 DEG C.
Preferably, the dielectric strength of the polyfluortetraethylene pipe is 37-50Kv/mm, and shrinkage temperature is greater than 330 DEG C, specific gravity
It is 2.15 × 103kg/m3。
Preferably, the polyfluortetraethylene pipe tensile strength of the production is 19.6MPa, and specific elongation rate is 250%.
Preferably, the partial size of the dispersion PTFE resin is 500 μm, and apparent density 0.45g/ml-0.55g/ml is helped crowded
No. 200 or No. 260 solvent naphthas are selected in agent.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention is processed into using dispersion P1 resin, principle
It is that FIFE work in-process is allowed to freeze by forced high-elastic deformation, this deformation is generated after stress with invertibity, low temperature, if weight
Newly heating the forced high-elastic deformation freezed will fade away and be returned to original state, and the polyfluortetraethylene pipe of production has heated
The characteristic of contraction, therefore can closely be coated on the appearance of other workpiece makes the workpiece have corrosion-resistant, electrical isolation and anti-sticking
Property, it can be widely used for the industry such as electrical, chemical industry, machinery, printing, FIFE heat-shrinkable tube maximum contraction rate is greater than 75%, solves
The polyfluortetraethylene pipe heat shrinkable of prior art production is poor, can not effectively improve the corrosion-resistant of workpiece, electrical insulating property and prevent
The problem of viscosity.
Specific embodiment
The following is a clear and complete description of the technical scheme in the embodiments of the invention, it is clear that described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
The present invention provides a kind of technical solution：A kind of polyfluortetraethylene pipe technique, includes the following steps：
（1）Mixing：PTFE and extrusion aid are mixed by mixing machine, incorporation time 10min-20min, mixing temperature is not
More than 19 DEG C；
（2）Storage：It is stored 24 hours or more under conditions of 25 DEG C -30 DEG C after mixing；
（3）It is preforming：By preforming mechanism embryo, compression speed 50mm/min, pressure is controlled in 0-3MPa；
（4）It pushes：It is pushed by upright push machine, material chamber temperature control when pushing is at 30 DEG C -50 DEG C, die temperature control
System is at 50 DEG C -60 DEG C；
（5）It is dry：The material after pushing is dried at 210 DEG C or less by dry and sintering furnace, drying time control exists
2h-3h；
（6）Sintering：After the completion of drying, dry and sintering furnace carries out indirect sintering, 60 DEG C/h of heating rate, 375 DEG C of ± 5 DEG C of heat preservations
4h, then continuous sintering are cooled down after the completion of sintering；
（7）Heat treatment：The process being quenched after the good pipe of drying and sintering is further sufficiently sintered at high temperature again, temperature
390 DEG C ± 2 DEG C, -5 DEG C of coolant liquid；
（8）Inflation：At 310 DEG C or so, 0.98MPa or less compressed gas, blow-up ratio 200%- are filled with by inflation machine
400%；
（9）It is cooling：Finished product is obtained through supercooling after the completion of inflation, cooling zone temperature is controlled at 300 DEG C or less.
Embodiment one：
PTFE and extrusion aid are mixed by mixing machine first, incorporation time 10min-20min, mixing temperature is no more than
19℃；It is stored 24 hours or more under conditions of 25 DEG C -30 DEG C after mixing；By preforming mechanism embryo, compression speed is
50mm/min, pressure are controlled in 0-3MPa；Then it is pushed by upright push machine, material chamber temperature when pushing is controlled 30
DEG C -50 DEG C, die temperature is controlled at 50 DEG C -60 DEG C；Pass through dry and sintering furnace after pushing at 210 DEG C or less to the object after pushing
Material is dried, and drying time controls in 2h-3h；After the completion of drying, dry and sintering furnace carries out indirect sintering, heating rate 60
DEG C/h, 375 DEG C of ± 5 DEG C of heat preservation 4h, then continuous sintering, sintering after the completion of cooled down；By pipe that drying and sintering is good after sintering
The process that son is quenched after being further sufficiently sintered at high temperature again, 390 DEG C ± 2 DEG C, -5 DEG C of coolant liquid of temperature；After heat treatment
310 DEG C or so, 0.98MPa or less compressed gas, blow-up ratio 200%-400% are filled with by inflation machine；Inflation passes through after completing
Supercooling obtains finished product, and cooling zone temperature is controlled at 300 DEG C or less.
Embodiment two：
In example 1, following processes are added：
Step（1）The group of the formula number of middle teflon rod is divided into：100 parts of dispersion PTFE resin, extrusion aid 20-
22 parts.
PTFE and extrusion aid are mixed by mixing machine first, incorporation time 10min-20min, mixing temperature is not
More than 19 DEG C, wherein the group of the formula number of teflon rod is divided into：100 parts of dispersion PTFE resin, extrusion aid 20-
22 parts；It is stored 24 hours or more under conditions of 25 DEG C -30 DEG C after mixing；By preforming mechanism embryo, compression speed is
50mm/min, pressure are controlled in 0-3MPa；Then it is pushed by upright push machine, material chamber temperature when pushing is controlled 30
DEG C -50 DEG C, die temperature is controlled at 50 DEG C -60 DEG C；Pass through dry and sintering furnace after pushing at 210 DEG C or less to the object after pushing
Material is dried, and drying time controls in 2h-3h；After the completion of drying, dry and sintering furnace carries out indirect sintering, heating rate 60
DEG C/h, 375 DEG C of ± 5 DEG C of heat preservation 4h, then continuous sintering, sintering after the completion of cooled down；By pipe that drying and sintering is good after sintering
The process that son is quenched after being further sufficiently sintered at high temperature again, 390 DEG C ± 2 DEG C, -5 DEG C of coolant liquid of temperature；After heat treatment
310 DEG C or so, 0.98MPa or less compressed gas, blow-up ratio 200%-400% are filled with by inflation machine；Inflation passes through after completing
Supercooling obtains finished product, and cooling zone temperature is controlled at 300 DEG C or less.
Embodiment three：
In example 2, following processes are added：
Step（4）Middle pushing rate becomes smaller with the increase of caliber, accelerates with becoming smaller for wall thickness.
PTFE and extrusion aid are mixed by mixing machine first, incorporation time 10min-20min, mixing temperature is not
More than 19 DEG C, wherein the group of the formula number of teflon rod is divided into：100 parts of dispersion PTFE resin, extrusion aid 20-
22 parts；It is stored 24 hours or more under conditions of 25 DEG C -30 DEG C after mixing；By preforming mechanism embryo, compression speed is
50mm/min, pressure are controlled in 0-3MPa；Then it is pushed by upright push machine, material chamber temperature when pushing is controlled 30
DEG C -50 DEG C, die temperature is controlled at 50 DEG C -60 DEG C, is pushed rate and is become smaller with the increase of caliber, with becoming smaller for wall thickness plus
Fastly；The material after pushing is dried at 210 DEG C or less by dry and sintering furnace after pushing, drying time controls in 2h-
3h；After the completion of drying, dry and sintering furnace carries out indirect sintering, heating rate 60 DEG C/h, then 375 DEG C of ± 5 DEG C of heat preservation 4h connect
Continuous sintering, is cooled down after the completion of sintering；The further sufficiently sintering at high temperature again by the good pipe of drying and sintering after sintering
The process being quenched afterwards, 390 DEG C ± 2 DEG C, -5 DEG C of coolant liquid of temperature；At 310 DEG C or so after heat treatment, it is filled with by inflation machine
0.98MPa or less compressed gas, blow-up ratio 200%-400%；Finished product, cooling zone temperature are obtained through supercooling after the completion of inflation
Control is at 300 DEG C or less.
Example IV：
In the third embodiment, following processes are added：
Step（5）The control of middle dry section temperature is at 100 DEG C -250 DEG C, and temperature control in preheating zone is at 250 DEG C -330 DEG C, sintering zone temperature
Degree control is at 380 DEG C -420 DEG C.
PTFE and extrusion aid are mixed by mixing machine first, incorporation time 10min-20min, mixing temperature is not
More than 19 DEG C, wherein the group of the formula number of teflon rod is divided into：100 parts of dispersion PTFE resin, extrusion aid 20-
22 parts；It is stored 24 hours or more under conditions of 25 DEG C -30 DEG C after mixing；By preforming mechanism embryo, compression speed is
50mm/min, pressure are controlled in 0-3MPa；Then it is pushed by upright push machine, material chamber temperature when pushing is controlled 30
DEG C -50 DEG C, die temperature is controlled at 50 DEG C -60 DEG C, is pushed rate and is become smaller with the increase of caliber, with becoming smaller for wall thickness plus
Fastly；The material after pushing is dried at 210 DEG C or less by dry and sintering furnace after pushing, drying time controls in 2h-
3h, the control of dry section temperature is at 100 DEG C -250 DEG C, and at 250 DEG C -330 DEG C, temperature control in sintering zone exists the control of preheating zone temperature
380℃-420℃；After the completion of drying, dry and sintering furnace carries out indirect sintering, 60 DEG C/h of heating rate, 375 DEG C of ± 5 DEG C of heat preservations
4h, then continuous sintering are cooled down after the completion of sintering；It is after sintering that the good pipe of drying and sintering is further at high temperature again
The process being sufficiently quenched after sintering, 390 DEG C ± 2 DEG C, -5 DEG C of coolant liquid of temperature；At 310 DEG C or so after heat treatment, pass through inflation machine
It is filled with 0.98MPa or less compressed gas, blow-up ratio 200%-400%；Finished product, cooling zone are obtained through supercooling after the completion of inflation
Temperature is controlled at 300 DEG C or less.
Embodiment five：
In example IV, following processes are added：
The dielectric strength of polyfluortetraethylene pipe is 37-50Kv/mm, and shrinkage temperature is greater than 330 DEG C, and specific gravity is 2.15 × 103kg/
m3；The polyfluortetraethylene pipe tensile strength of production is 19.6MPa, and specific elongation rate is 250%.
PTFE and extrusion aid are mixed by mixing machine first, incorporation time 10min-20min, mixing temperature is not
More than 19 DEG C, wherein the group of the formula number of teflon rod is divided into：100 parts of dispersion PTFE resin, extrusion aid 20-
22 parts；It is stored 24 hours or more under conditions of 25 DEG C -30 DEG C after mixing；By preforming mechanism embryo, compression speed is
50mm/min, pressure are controlled in 0-3MPa；Then it is pushed by upright push machine, material chamber temperature when pushing is controlled 30
DEG C -50 DEG C, die temperature is controlled at 50 DEG C -60 DEG C, is pushed rate and is become smaller with the increase of caliber, with becoming smaller for wall thickness plus
Fastly；The material after pushing is dried at 210 DEG C or less by dry and sintering furnace after pushing, drying time controls in 2h-
3h, the control of dry section temperature is at 100 DEG C -250 DEG C, and at 250 DEG C -330 DEG C, temperature control in sintering zone exists the control of preheating zone temperature
380℃-420℃；After the completion of drying, dry and sintering furnace carries out indirect sintering, 60 DEG C/h of heating rate, 375 DEG C of ± 5 DEG C of heat preservations
4h, then continuous sintering are cooled down after the completion of sintering；It is after sintering that the good pipe of drying and sintering is further at high temperature again
The process being sufficiently quenched after sintering, 390 DEG C ± 2 DEG C, -5 DEG C of coolant liquid of temperature；At 310 DEG C or so after heat treatment, pass through inflation machine
It is filled with 0.98MPa or less compressed gas, blow-up ratio 200%-400%；Finished product, cooling zone are obtained through supercooling after the completion of inflation
Temperature is controlled at 300 DEG C or less；The dielectric strength of polyfluortetraethylene pipe is 37-50Kv/mm, and shrinkage temperature is greater than 330 DEG C, specific gravity
It is 2.15 × 103kg/m3；The polyfluortetraethylene pipe tensile strength of production is 19.6MPa, and specific elongation rate is 250%.
Embodiment six：
In embodiment five, following processes are added：
The partial size of dispersion PTFE resin be 500 μm, apparent density 0.45g/ml-0.55g/ml, extrusion aid select No. 200 or
No. 260 solvent naphthas.
PTFE and extrusion aid are mixed by mixing machine first, incorporation time 10min-20min, mixing temperature is not
More than 19 DEG C, wherein the group of the formula number of teflon rod is divided into：100 parts of dispersion PTFE resin, extrusion aid 20-
22 parts, the partial size of dispersion PTFE resin is 500 μm, apparent density 0.45g/ml-0.55g/ml, extrusion aid select No. 200 or
No. 260 solvent naphthas；It is stored 24 hours or more under conditions of 25 DEG C -30 DEG C after mixing；Pass through preforming mechanism embryo, compression
Rate is 50mm/min, and pressure is controlled in 0-3MPa；Then it is pushed by upright push machine, material chamber temperature control when pushing
At 30 DEG C -50 DEG C, die temperature is controlled at 50 DEG C -60 DEG C system, is pushed rate and is become smaller with the increase of caliber, with becoming smaller for wall thickness
And accelerate；The material after pushing is dried at 210 DEG C or less by dry and sintering furnace after pushing, drying time control exists
2h-3h, the control of dry section temperature is at 100 DEG C -250 DEG C, and at 250 DEG C -330 DEG C, sintering zone temperature controls the control of preheating zone temperature
At 380 DEG C -420 DEG C；After the completion of drying, dry and sintering furnace carries out indirect sintering, 60 DEG C/h of heating rate, 375 DEG C of ± 5 DEG C of guarantors
Warm 4h, then continuous sintering are cooled down after the completion of sintering；By the good pipe of drying and sintering again at high temperature into one after sintering
The process being quenched after step sufficiently sintering, 390 DEG C ± 2 DEG C, -5 DEG C of coolant liquid of temperature；At 310 DEG C or so after heat treatment, pass through inflation
Machine is filled with 0.98MPa or less compressed gas, blow-up ratio 200%-400%；Finished product is obtained through supercooling after the completion of inflation, it is cooling
Area's temperature is controlled at 300 DEG C or less；The dielectric strength of polyfluortetraethylene pipe is 37-50Kv/mm, and shrinkage temperature is greater than 330 DEG C, than
Weight is 2.15 × 103kg/m3；The polyfluortetraethylene pipe tensile strength of production is 19.6MPa, and specific elongation rate is 250%.
The present invention is processed into using dispersion P1 resin, and principle is that FIFE work in-process is forced high by generating after stress
Deformation is played, this deformation has invertibity, and low temperature is allowed to freeze, if reheating the forced high-elastic deformation freezed will gradually disappear
Original state is lost and is returned to, the polyfluortetraethylene pipe of production has the characteristic of heat shrinkable, therefore can closely be coated on other
The appearance of workpiece makes the workpiece have corrosion-resistant, electrical isolation and antistick characteristic, can be widely used for electrical, chemical industry, machinery, printing etc.
Industry, FIFE heat-shrinkable tube maximum contraction rate are greater than 75%, solve the polyfluortetraethylene pipe heat shrinkable of prior art production
The problem of property is poor, can not effectively improve the corrosion-resistant of workpiece, electrical insulating property and antistick characteristic.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (7)
1. a kind of polyfluortetraethylene pipe technique, it is characterised in that：Include the following steps：
（1）Mixing：PTFE and extrusion aid are mixed by mixing machine, incorporation time 10min-20min, mixing temperature is not
More than 19 DEG C；
（2）Storage：It is stored 24 hours or more under conditions of 25 DEG C -30 DEG C after mixing；
（3）It is preforming：By preforming mechanism embryo, compression speed 50mm/min, pressure is controlled in 0-3MPa；
（4）It pushes：It is pushed by upright push machine, material chamber temperature control when pushing is at 30 DEG C -50 DEG C, die temperature control
System is at 50 DEG C -60 DEG C；
（5）It is dry：The material after pushing is dried at 210 DEG C or less by dry and sintering furnace, drying time control exists
2h-3h；
（6）Sintering：After the completion of drying, dry and sintering furnace carries out indirect sintering, 60 DEG C/h of heating rate, 375 DEG C of ± 5 DEG C of heat preservations
4h, then continuous sintering are cooled down after the completion of sintering；
（7）Heat treatment：The process being quenched after the good pipe of drying and sintering is further sufficiently sintered at high temperature again, temperature
390 DEG C ± 2 DEG C, -5 DEG C of coolant liquid；
（8）Inflation：At 310 DEG C or so, 0.98MPa or less compressed gas, blow-up ratio 200%- are filled with by inflation machine
400%；
（9）It is cooling：Finished product is obtained through supercooling after the completion of inflation, cooling zone temperature is controlled at 300 DEG C or less.
2. a kind of polyfluortetraethylene pipe technique according to claim 1, it is characterised in that：The step（1）Middle polytetrafluoro
The group of the formula number of ethylene stick is divided into：100 parts of dispersion PTFE resin, 20-22 parts of extrusion aid.
3. a kind of polyfluortetraethylene pipe technique according to claim 1, it is characterised in that：The step（4）Middle pushing speed
Rate becomes smaller with the increase of caliber, accelerates with becoming smaller for wall thickness.
4. a kind of polyfluortetraethylene pipe technique according to claim 1, it is characterised in that：The step（5）Middle dry section
Temperature control is at 100 DEG C -250 DEG C, and at 250 DEG C -330 DEG C, sintering zone temperature is controlled at 380 DEG C -420 the control of preheating zone temperature
℃。
5. a kind of polyfluortetraethylene pipe technique according to claim 1, it is characterised in that：The polyfluortetraethylene pipe it is exhausted
Edge intensity is 37-50Kv/mm, and shrinkage temperature is greater than 330 DEG C, and specific gravity is 2.15 × 103kg/m3。
6. a kind of polyfluortetraethylene pipe technique according to claim 1, it is characterised in that：The polytetrafluoroethylene (PTFE) of the production
Pipe tensile strength is 19.6MPa, and specific elongation rate is 250%.
7. a kind of polyfluortetraethylene pipe technique according to claim 2, it is characterised in that：The grain of the dispersion PTFE resin
Diameter is 500 μm, apparent density 0.45g/ml-0.55g/ml, and extrusion aid selects No. 200 or No. 260 solvent naphthas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810739359.9A CN108908923A (en) | 2018-07-06 | 2018-07-06 | A kind of polyfluortetraethylene pipe technique |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810739359.9A CN108908923A (en) | 2018-07-06 | 2018-07-06 | A kind of polyfluortetraethylene pipe technique |
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| Publication Number | Publication Date |
|---|---|
| CN108908923A true CN108908923A (en) | 2018-11-30 |
Family
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| CN201810739359.9A Pending CN108908923A (en) | 2018-07-06 | 2018-07-06 | A kind of polyfluortetraethylene pipe technique |
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| CN113480817A (en) * | 2021-06-11 | 2021-10-08 | 湖北宇辰新材料有限公司 | Preparation method of polytetrafluoroethylene rod |
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Application publication date: 20181130 |