CN111255956A - Multilayer polytetrafluoroethylene tube and preparation process thereof - Google Patents
Multilayer polytetrafluoroethylene tube and preparation process thereof Download PDFInfo
- Publication number
- CN111255956A CN111255956A CN201911362320.0A CN201911362320A CN111255956A CN 111255956 A CN111255956 A CN 111255956A CN 201911362320 A CN201911362320 A CN 201911362320A CN 111255956 A CN111255956 A CN 111255956A
- Authority
- CN
- China
- Prior art keywords
- polytetrafluoroethylene
- layer
- stainless steel
- steel wire
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
- F16L9/127—Rigid pipes of plastics with or without reinforcement the walls consisting of a single layer
- F16L9/128—Reinforced pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a multilayer polytetrafluoroethylene tube and a preparation method thereof, wherein polytetrafluoroethylene comprises a polytetrafluoroethylene layer serving as an inner container, a stainless steel wire woven layer and an organic silicon rubber layer, the stainless steel wire woven layer is positioned between the polytetrafluoroethylene layer and the organic silicon rubber layer, the stainless steel wire woven layer is provided with meshes, and the polytetrafluoroethylene layer is in contact with the organic silicon rubber layer through the meshes. According to the invention, the stainless steel wire woven net is coated on the outer wall of the pure polytetrafluoroethylene, so that the polytetrafluoroethylene can be bent in a small radius without being damaged, wherein the externally coated silicone rubber layer has excellent low temperature resistance and high temperature resistance and good ductility, and can further guarantee the small radius bending of the polytetrafluoroethylene tube. The stainless steel wire mesh grid is wrapped in the polytetrafluoroethylene layer and the organic silicon rubber layer at the same time, so that each layer can not fall off when the stainless steel wire mesh grid is used.
Description
Technical Field
The invention relates to a pipe production technology, in particular to a multilayer polytetrafluoroethylene pipe and a preparation process thereof.
Background
The polytetrafluoroethylene has excellent chemical stability, corrosion resistance, high lubrication non-adhesiveness and good ageing resistance, can be prepared into polytetrafluoroethylene tubes, rods, belts, films and the like, and is widely applied to the fields of machinery, chemical engineering, aviation, electrical and electronic industry, national defense industry, advanced science and technology, medical sanitation, electrical insulation and the like.
The existing polytetrafluoroethylene tube cannot be bent in a small radius, and the polytetrafluoroethylene tube is damaged due to the excessively small bending radius, so that the popularization and the use of the polytetrafluoroethylene tube are restricted.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a multilayer polytetrafluoroethylene tube and a preparation process thereof, so as to overcome the defect that the rigidity of the existing polytetrafluoroethylene tube is too high, and meet the requirement of small-radius bending on the basis of not changing the advantages of polytetrafluoroethylene.
According to the technical scheme, the multi-layer polytetrafluoroethylene tube comprises a polytetrafluoroethylene layer serving as an inner container, a stainless steel wire woven layer and an organic silicon rubber layer, wherein the stainless steel wire woven layer is located between the polytetrafluoroethylene layer and the organic silicon rubber layer, meshes are formed in the stainless steel wire woven layer, and the polytetrafluoroethylene layer and the organic silicon rubber layer are in contact through the meshes.
Furthermore, the outer surface of the organic silicon rubber layer is covered with a stainless steel wire woven layer.
Further, the polytetrafluoroethylene layer is composed of the following components in parts by mass: 85-95% of polytetrafluoroethylene dispersion resin and 5-15% of extrusion auxiliary agent.
Further, the polytetrafluoroethylene layer is composed of the following components in parts by mass: 85% of polytetrafluoroethylene dispersion resin and 15% of extrusion auxiliary agent.
Further, the polytetrafluoroethylene layer is composed of the following components in parts by mass: 90% of polytetrafluoroethylene dispersion resin and 10% of extrusion auxiliary agent.
Further, the polytetrafluoroethylene layer is composed of the following components in parts by mass: 95% of polytetrafluoroethylene dispersion resin and 15% of extrusion auxiliary agent.
Further, the preparation process of the multilayer polytetrafluoroethylene tube comprises the following steps:
s1, constant-temperature treatment of raw materials: grinding and mixing polytetrafluoroethylene dispersion resin and an extrusion auxiliary agent in a specified mass part at normal temperature;
s2, constant-temperature curing: curing the prepared polytetrafluoroethylene dispersion resin and the extrusion auxiliary agent at the constant temperature of 35-45 ℃ for 48 h;
s3, prepressing to prepare a blank: guiding the cured polytetrafluoroethylene dispersion resin and the extrusion auxiliary agent into a material cavity of a blank making machine to make a blank;
s4, extrusion and push-out: feeding the pre-pressed blank into a material cavity of an extruder to prepare a polytetrafluoroethylene layer serving as an inner container;
s5, coating 1: attaching a glowing stainless steel wire mesh grid on the surface of the stainless steel wire mesh grid, wherein the temperature of the stainless steel wire mesh grid is not lower than 500 ℃;
s6, deoiling and drying: drying and decontaminating the extrusion aid in the pipe by heating at high temperature;
s7, coating 2: placing the basically molded pipe in a mold, taking the basically molded pipe as the inner wall of the mold, and pouring an organic silicon rubber solution;
and S8, high-temperature sintering and shaping.
Further, in step S1, the particle size of the tetrafluoroethylene and the extrusion assistant after grinding is 1300 mesh.
The invention has the beneficial effects that:
according to the invention, the stainless steel wire woven net is coated on the outer wall of the pure polytetrafluoroethylene, so that the polytetrafluoroethylene can be bent in a small radius without being damaged, wherein the externally coated silicone rubber layer has excellent low temperature resistance and high temperature resistance and good ductility, and can further guarantee the small radius bending of the polytetrafluoroethylene tube. The stainless steel wire mesh grid is wrapped in the polytetrafluoroethylene layer and the organic silicon rubber layer at the same time, so that each layer can not fall off when the stainless steel wire mesh grid is used.
Detailed Description
The following describes the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The utility model provides a multilayer polytetrafluoroethylene pipe, polytetrafluoroethylene includes polytetrafluoroethylene layer, stainless steel wire woven layer, the organosilicon rubber layer as the inner bag, stainless steel wire woven layer is located between polytetrafluoroethylene layer and the organosilicon rubber layer, be equipped with the mesh on the stainless steel wire woven layer, polytetrafluoroethylene layer and organosilicon rubber layer pass the mesh and have the contact.
Wherein the polytetrafluoroethylene layer consists of 85% of polytetrafluoroethylene dispersion resin and 15% of extrusion auxiliary agent.
The preparation process of the multilayer polytetrafluoroethylene tube comprises the following steps:
s1, constant-temperature treatment of raw materials: grinding and mixing polytetrafluoroethylene dispersion resin and an extrusion auxiliary agent in a specified mass part at normal temperature;
s2, constant-temperature curing: curing the prepared polytetrafluoroethylene dispersion resin and the extrusion auxiliary agent at the constant temperature of 35 ℃ for 48h, and setting the temperature of a thermostat to be 48 ℃ so that the extrusion auxiliary agent is fully diffused into resin molecules;
s3, prepressing to prepare a blank: and introducing the cured polytetrafluoroethylene dispersion resin and the extrusion auxiliary agent into a material cavity of a blank making machine to prepare a blank. The pressure is controlled at 1MPa, and the speed is 100 mm/min. Setting the heating temperature of the blank making cavity to be 48 ℃;
s4, extrusion and push-out: and (3) feeding the pre-pressed blank into a material cavity of an extruder to prepare the polytetrafluoroethylene layer serving as the inner container. The pressure of the extruder is 10MPa, the speed is 10mm/min, the heating temperature of the material cavity is set to be 48 ℃, and the heating temperature of the neck ring mold is set to be 50 ℃. (ii) a
S5, coating 1: attaching a glowing stainless steel wire mesh grid on the surface of the stainless steel wire mesh grid, wherein the temperature of the stainless steel wire mesh grid is 500 ℃;
s6, deoiling and drying: the extrusion aid in the pipe is dried and completely removed by heating at high temperature, the heating temperature is divided into 2 sections, and the temperature is set as: 205 ℃, 225 ℃, and the traction speed is as follows: 10 mm/min;
s7, coating 2: placing the basically molded pipe in a mold, taking the basically molded pipe as the inner wall of the mold, and pouring an organic silicon rubber solution;
and S8, high-temperature sintering and shaping. The technological parameters are set as follows: quenching temperature: and (3) quenching liquid temperature of 380 ℃: 15 ℃, quenching time: for 20 minutes.
Example 2
The utility model provides a multilayer polytetrafluoroethylene pipe, polytetrafluoroethylene includes polytetrafluoroethylene layer, stainless steel wire woven layer, the organosilicon rubber layer as the inner bag, stainless steel wire woven layer is located between polytetrafluoroethylene layer and the organosilicon rubber layer, be equipped with the mesh on the stainless steel wire woven layer, polytetrafluoroethylene layer and organosilicon rubber layer pass the mesh and have the contact.
Wherein the polytetrafluoroethylene layer consists of 90% of polytetrafluoroethylene dispersion resin and 10% of extrusion auxiliary agent.
The preparation process of the multilayer polytetrafluoroethylene tube comprises the following steps:
s1, constant-temperature treatment of raw materials: grinding and mixing polytetrafluoroethylene dispersion resin and an extrusion auxiliary agent in a specified mass part at normal temperature;
s2, constant-temperature curing: curing the prepared polytetrafluoroethylene dispersion resin and the extrusion auxiliary agent at the constant temperature of 35 ℃ for 48h, and setting the temperature of a thermostat to be 48 ℃ so that the extrusion auxiliary agent is fully diffused into resin molecules;
s3, prepressing to prepare a blank: and introducing the cured polytetrafluoroethylene dispersion resin and the extrusion auxiliary agent into a material cavity of a blank making machine to prepare a blank. The pressure is controlled at 1MPa, and the speed is 100 mm/min. Setting the heating temperature of the blank making cavity to be 48 ℃;
s4, extrusion and push-out: and (3) feeding the pre-pressed blank into a material cavity of an extruder to prepare the polytetrafluoroethylene layer serving as the inner container. The pressure of the extruder is 10MPa, the speed is 10mm/min, the heating temperature of the material cavity is set to be 48 ℃, and the heating temperature of the neck ring mold is set to be 50 ℃. (ii) a
S5, coating 1: attaching a glowing stainless steel wire mesh grid on the surface of the stainless steel wire mesh grid, wherein the temperature of the stainless steel wire mesh grid is 600 ℃;
s6, deoiling and drying: the extrusion aid in the pipe is dried and completely removed by heating at high temperature, the heating temperature is divided into 2 sections, and the temperature is set as: 205 ℃, 225 ℃, and the traction speed is as follows: 10 mm/min;
s7, coating 2: placing the basically molded pipe in a mold, taking the basically molded pipe as the inner wall of the mold, and pouring an organic silicon rubber solution;
and S8, high-temperature sintering and shaping. The technological parameters are set as follows: quenching temperature: and (3) quenching liquid temperature of 380 ℃: 15 ℃, quenching time: for 20 minutes.
Example 3
The utility model provides a multilayer polytetrafluoroethylene pipe, polytetrafluoroethylene includes polytetrafluoroethylene layer, stainless steel wire woven layer, the organosilicon rubber layer as the inner bag, stainless steel wire woven layer is located between polytetrafluoroethylene layer and the organosilicon rubber layer, be equipped with the mesh on the stainless steel wire woven layer, polytetrafluoroethylene layer and organosilicon rubber layer pass the mesh and have the contact.
Wherein the polytetrafluoroethylene layer consists of 85% of polytetrafluoroethylene dispersion resin and 15% of extrusion auxiliary agent.
The preparation process of the multilayer polytetrafluoroethylene tube comprises the following steps:
s1, constant-temperature treatment of raw materials: grinding and mixing polytetrafluoroethylene dispersion resin and an extrusion auxiliary agent in a specified mass part at normal temperature;
s2, constant-temperature curing: curing the prepared polytetrafluoroethylene dispersion resin and the extrusion auxiliary agent at the constant temperature of 35 ℃ for 48h, and setting the temperature of a thermostat to be 48 ℃ so that the extrusion auxiliary agent is fully diffused into resin molecules;
s3, prepressing to prepare a blank: and introducing the cured polytetrafluoroethylene dispersion resin and the extrusion auxiliary agent into a material cavity of a blank making machine to prepare a blank. The pressure is controlled at 1MPa, and the speed is 100 mm/min. Setting the heating temperature of the blank making cavity to be 48 ℃;
s4, extrusion and push-out: and (3) feeding the pre-pressed blank into a material cavity of an extruder to prepare the polytetrafluoroethylene layer serving as the inner container. The pressure of the extruder is 10MPa, the speed is 10mm/min, the heating temperature of the material cavity is set to be 48 ℃, and the heating temperature of the neck ring mold is set to be 50 ℃. (ii) a
S5, coating 1: attaching a glowing stainless steel wire mesh grid on the surface of the stainless steel wire mesh grid, wherein the temperature of the stainless steel wire mesh grid is 700 ℃;
s6, deoiling and drying: the extrusion aid in the pipe is dried and completely removed by heating at high temperature, the heating temperature is divided into 2 sections, and the temperature is set as: 205 ℃, 225 ℃, and the traction speed is as follows: 10 mm/min;
s7, coating 2: placing the basically molded pipe in a mold to be used as the inner wall of the mold, placing a cylindrical stainless steel wire mesh grid on the mold wall in a manner of being tightly attached to the mold wall, and pouring an organic silicon rubber solution;
s8, weaving: a stainless steel wire woven net is woven outside the organic silicon rubber layer, and an anti-drop joint is arranged at the end part of the organic silicon rubber layer;
and S9, high-temperature sintering and shaping. The technological parameters are set as follows: quenching temperature: and (3) quenching liquid temperature of 380 ℃: 15 ℃, quenching time: for 20 minutes.
Comparative example
A polytetrafluoroethylene tube is prepared from 85% of polytetrafluoroethylene dispersion resin and 15% of extrusion auxiliary agent by the following processes:
s1, constant-temperature treatment of raw materials: grinding and mixing polytetrafluoroethylene dispersion resin and an extrusion auxiliary agent in a specified mass part at normal temperature;
s2, constant-temperature curing: curing the prepared polytetrafluoroethylene dispersion resin and the extrusion auxiliary agent at the constant temperature of 35 ℃ for 48h, and setting the temperature of a thermostat to be 48 ℃ so that the extrusion auxiliary agent is fully diffused into resin molecules;
s3, prepressing to prepare a blank: and introducing the cured polytetrafluoroethylene dispersion resin and the extrusion auxiliary agent into a material cavity of a blank making machine to prepare a blank. The pressure is controlled at 1MPa, and the speed is 100 mm/min. Setting the heating temperature of the blank making cavity to be 48 ℃;
s4, extrusion and push-out: and (3) feeding the pre-pressed blank into a material cavity of an extruder to prepare the polytetrafluoroethylene layer serving as the inner container. The pressure of the extruder is 10MPa, the speed is 10mm/min, the heating temperature of the material cavity is set to be 48 ℃, and the heating temperature of the neck ring mold is set to be 50 ℃. (ii) a
S5, deoiling and drying: the extrusion aid in the pipe is dried and completely removed by heating at high temperature, the heating temperature is divided into 2 sections, and the temperature is set as: 205 ℃, 225 ℃, and the traction speed is as follows: 10 mm/min;
and S6, high-temperature sintering and shaping. The technological parameters are set as follows: quenching temperature: and (3) quenching liquid temperature of 380 ℃: 15 ℃, quenching time: for 20 minutes.
The polytetrafluoroethylene tube manufactured according to the formula and the preparation process of the example 1 and the comparative example is tested according to the detection method given by the national standard, and the test results are as follows:
the foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A multilayer polytetrafluoroethylene tube characterized by: the polytetrafluoroethylene comprises a polytetrafluoroethylene layer serving as an inner container, a stainless steel wire woven layer and an organic silicon rubber layer, wherein the stainless steel wire woven layer is located between the polytetrafluoroethylene layer and the organic silicon rubber layer, a mesh is arranged on the stainless steel wire woven layer, and the polytetrafluoroethylene layer and the organic silicon rubber layer penetrate through the mesh to be in contact.
2. The multilayer polytetrafluoroethylene tube according to claim 1, wherein: the outer surface of the organic silicon rubber layer is covered with a stainless steel wire woven layer.
3. The multilayer polytetrafluoroethylene tube according to claim 1, wherein the polytetrafluoroethylene layer comprises the following components in parts by mass: 85-95% of polytetrafluoroethylene dispersion resin and 5-15% of extrusion auxiliary agent.
4. The multilayer polytetrafluoroethylene tube according to claim 3, wherein said polytetrafluoroethylene layer is composed of the following components in parts by mass: 85% of polytetrafluoroethylene dispersion resin and 15% of extrusion auxiliary agent.
5. The multilayer polytetrafluoroethylene tube according to claim 3, wherein said polytetrafluoroethylene layer is composed of the following components in parts by mass: 90% of polytetrafluoroethylene dispersion resin and 10% of extrusion auxiliary agent.
6. The multilayer polytetrafluoroethylene tube according to claim 3, wherein said polytetrafluoroethylene layer is composed of the following components in parts by mass: 95% of polytetrafluoroethylene dispersion resin and 15% of extrusion auxiliary agent.
7. The process for the preparation of a multilayer polytetrafluoroethylene tube according to any one of claims 4 to 6, comprising the following steps:
s1, constant-temperature treatment of raw materials: grinding and mixing polytetrafluoroethylene dispersion resin and an extrusion auxiliary agent in a specified mass part at normal temperature;
s2, constant-temperature curing: curing the prepared polytetrafluoroethylene dispersion resin and the extrusion auxiliary agent at the constant temperature of 35-45 ℃ for 48 h;
s3, prepressing to prepare a blank: guiding the cured polytetrafluoroethylene dispersion resin and the extrusion auxiliary agent into a material cavity of a blank making machine to make a blank;
s4, extrusion and push-out: feeding the pre-pressed blank into a material cavity of an extruder to prepare a polytetrafluoroethylene layer serving as an inner container;
s5, coating 1: attaching a glowing stainless steel wire mesh grid on the surface of the stainless steel wire mesh grid, wherein the temperature of the stainless steel wire mesh grid is not lower than 500 ℃;
s6, deoiling and drying: drying and decontaminating the extrusion aid in the pipe by heating at high temperature;
s7, coating 2: placing the basically molded pipe in a mold, taking the basically molded pipe as the inner wall of the mold, pouring an organic silicon rubber solution, and cooling and shaping;
and S8, high-temperature sintering and shaping.
8. The process of claim 7 for the preparation of a multilayer polytetrafluoroethylene tube, wherein: in the step S1, the particle size of the tetrafluoroethylene and the extrusion assistant after grinding is 1300 mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911362320.0A CN111255956A (en) | 2019-12-26 | 2019-12-26 | Multilayer polytetrafluoroethylene tube and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911362320.0A CN111255956A (en) | 2019-12-26 | 2019-12-26 | Multilayer polytetrafluoroethylene tube and preparation process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111255956A true CN111255956A (en) | 2020-06-09 |
Family
ID=70952282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911362320.0A Pending CN111255956A (en) | 2019-12-26 | 2019-12-26 | Multilayer polytetrafluoroethylene tube and preparation process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111255956A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5170011A (en) * | 1991-09-25 | 1992-12-08 | Teleflex Incorporated | Hose assembly |
| CN101896334A (en) * | 2007-12-28 | 2010-11-24 | 美国圣戈班性能塑料公司 | Reinforced tube |
| CN104797409A (en) * | 2012-11-16 | 2015-07-22 | 康斯博格驱动***第二公司 | Method of forming a hose assembly |
| CN105965923A (en) * | 2016-06-06 | 2016-09-28 | 苏州捷宁模塑有限公司 | Processing process for polytetrafluoroethylene steel wire composite pipe |
| CN108698358A (en) * | 2016-09-19 | 2018-10-23 | 康蒂泰克Mgw有限公司 | Fluoroelastomer/EPDM hoses for the application of cold side pressurized air |
-
2019
- 2019-12-26 CN CN201911362320.0A patent/CN111255956A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5170011A (en) * | 1991-09-25 | 1992-12-08 | Teleflex Incorporated | Hose assembly |
| CN101896334A (en) * | 2007-12-28 | 2010-11-24 | 美国圣戈班性能塑料公司 | Reinforced tube |
| CN104797409A (en) * | 2012-11-16 | 2015-07-22 | 康斯博格驱动***第二公司 | Method of forming a hose assembly |
| CN105965923A (en) * | 2016-06-06 | 2016-09-28 | 苏州捷宁模塑有限公司 | Processing process for polytetrafluoroethylene steel wire composite pipe |
| CN108698358A (en) * | 2016-09-19 | 2018-10-23 | 康蒂泰克Mgw有限公司 | Fluoroelastomer/EPDM hoses for the application of cold side pressurized air |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109400934B (en) | Preparation method of flexible super-hydrophobic self-cleaning surface | |
| JP2014169458A5 (en) | ||
| CN105751539A (en) | Preparation method of waterproof polytetrafluoroethylene thin film | |
| JP5109102B2 (en) | PTFE tube manufacturing method | |
| CN106495695A (en) | A kind of method for improving graphite-pipe thermal conductivity | |
| CN106566235A (en) | High-temperature-resistant nylon/attapulgite composite material and preparation method thereof | |
| EP3738756B1 (en) | A pfa molded body with improved blister resistance and its use for semiconductor application | |
| CN111255956A (en) | Multilayer polytetrafluoroethylene tube and preparation process thereof | |
| CN110978562B (en) | Preparation method of high-temperature-resistant composite material cabin section | |
| CN104529533B (en) | The preparation method of graphite-pipe for a kind of heat exchanger | |
| CN205255306U (en) | Raw materials heating and melting device of polytetrafluoroethylene raw material area production | |
| CN108003613A (en) | A kind of nylon of resistance to alcohol and preparation method thereof | |
| WO2019109203A1 (en) | Heat treatment method for 3d printed workpiece | |
| CN105965923A (en) | Processing process for polytetrafluoroethylene steel wire composite pipe | |
| CN109338717B (en) | Flexible conductive fiber based on silver nanowires and preparation method thereof | |
| CN114834076B (en) | Preparation method and device for directly forming large-diameter latex filaments | |
| CN108864994B (en) | Soluble adhesive, soluble core mold and preparation method | |
| CN115124777A (en) | Glass fiber reinforced plastic pipe and preparation method thereof | |
| CN102604594B (en) | Preparation method of high-temperature composite sealing material | |
| CN106783165A (en) | A kind of thin film capacitor sealing wax and preparation method thereof | |
| CN107471698A (en) | A kind of production method of polyfluortetraethylene pipe | |
| CN106079475B (en) | The manufacturing method of the solid head tube material of one end closure of composite material | |
| CN114347538A (en) | Preparation process of special protective gloves | |
| CN111255957A (en) | High-pressure-resistance tetrafluoride pipe and preparation method thereof | |
| CN114230835B (en) | Low-permeability polytetrafluoroethylene tube and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200609 |
|
| RJ01 | Rejection of invention patent application after publication |