CN111136930A - Processing and production process of polytetrafluoroethylene suspension resin - Google Patents
Processing and production process of polytetrafluoroethylene suspension resin Download PDFInfo
- Publication number
- CN111136930A CN111136930A CN201911365901.XA CN201911365901A CN111136930A CN 111136930 A CN111136930 A CN 111136930A CN 201911365901 A CN201911365901 A CN 201911365901A CN 111136930 A CN111136930 A CN 111136930A
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- China
- Prior art keywords
- sintering
- polytetrafluoroethylene
- resin
- blank
- cooling
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- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
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- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
-
- 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
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/02—Moulding by agglomerating
- B29C67/04—Sintering
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5808—Measuring, controlling or regulating pressure or compressing force
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5816—Measuring, controlling or regulating temperature
-
- 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
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a processing and production process of polytetrafluoroethylene suspension resin, which comprises the following steps: preforming, namely pressing polytetrafluoroethylene resin powder into a blank, namely a preform at 20-200 ℃ and 16-64 MaP; sintering, namely placing the preformed product in a mould, placing the preformed product and the mould in a sintering furnace for sintering, and heating the preformed product to be more than 327 ℃; cooling, namely gradually cooling the blank in the sintering material to room temperature in the die at a set cooling rate; turning and forming, namely turning the polytetrafluoroethylene suspension resin blank into a sheet or a film with a certain thickness; casting, namely, reheating the sintered preform or sheet to 320 ℃ and then pressing the preheated preform or sheet into a mold with the temperature of more than 180 ℃ for secondary molding; extrusion, in which a polytetrafluoroethylene suspension resin is continuously fed into a screw or ram extruder, compacted at the head through a sintering zone and cooled to produce elongated products such as rods and tubes. The invention improves the existing processing technology, can enhance the creep resistance and weldability of the resin, and improves the basic strength.
Description
Technical Field
The invention belongs to the field of detection, and particularly relates to a processing and production process of polytetrafluoroethylene suspension resin for improving detection precision.
Background
The polytetrafluoroethylene has excellent chemical corrosion resistance, high and low temperature resistance, aging resistance, low friction, non-adhesiveness and physiological inertia, so that the polytetrafluoroethylene becomes an indispensable special material in the fields of chemical industry, machinery, electricity, construction, medical treatment and the like. At present, most of the polytetrafluoroethylene suspension resins in China are general type molding resins, belong to middle and low grade resin products, and are generally prepared by adopting a thermal decomposition initiation system of ammonium persulfate or an oxidation-reduction system of ammonium persulfate-sodium bisulfite or an oxidation-reduction system catalyzed by ferrous sulfate. With the widening of the application of the polytetrafluoroethylene suspension resin and the progress of the processing technology of manufactured products, the internal quality of the general PTFE suspension resin needs to be improved, and the core of the improvement is that the resin has defects in molecular weight and low basic strength, and the high-end application of the suspension PTFE resin is limited.
The processing performance of the existing polytetrafluoroethylene suspension resin needs to be improved to enhance the creep resistance and weldability of the resin and improve the basic strength.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the problem of improving the existing polytetrafluoroethylene suspension resin processing technology so as to enhance the creep resistance and weldability of the resin and improve the basic strength.
In order to achieve the purpose, the invention adopts the following technical scheme: a processing and production process of polytetrafluoroethylene suspension resin comprises the following steps:
s1, performing in a pre-forming mode,
pressing polytetrafluoroethylene resin powder at 20-200 ℃ and 16-64 MaP to form a blank, namely a preform;
s2, sintering the mixture,
pre-forming, putting the mixture into a mould, putting the mould and the mould into a sintering furnace for sintering, and heating the mixture to be higher than 327 ℃;
s3, cooling the mixture,
gradually cooling the blank in the sintering material to room temperature in a mould at a set cooling rate;
s4, turning and forming the blank,
turning the polytetrafluoroethylene suspension resin blank into a sheet or a film with a certain thickness;
s5, casting and pressing the steel plate,
heating the sintered preform or sheet to 320 ℃ and pressing the heated preform or sheet into a mold with the temperature of over 180 ℃ for secondary molding;
s6, extruding the mixture,
the polytetrafluoroethylene suspension resin is continuously fed into a screw or ram extruder where the material is compacted at the head through a sintering zone and then cooled to process elongated products such as rods and tubes.
Further, S1. at the preforming step, polytetrafluoroethylene resin powder should be sieved with a fine sieve to break up agglomerated powder.
Further, S2, during the sintering step, the temperature distribution on the workpiece should be uniform, and the temperature difference should be controlled within +/-5 ℃; the sintering furnace should be equipped with an exhaust channel or fan to exhaust the exhaust gas; the furnace door is provided with a linkage mechanism, and the circulating fan can stop when the furnace door is opened; the sintering furnace should have a good thermal insulation so that the cooling rate does not exceed 20 ℃/h when the door is closed for cooling.
Further, in the step S3, water circulation is adopted to accelerate cooling.
Further, S5, in the step of casting and pressing, a press capable of rapidly rising is selected for the die-casting machine, the pressure needs to reach 64MPa, a heating furnace is arranged on the press, and the sintering parison can be kept at a constant temperature at 320 ℃ during the die-casting; the die is a full-pressure die made of heat-treated nickel-chromium steel and is heated by hot oil circulation or electric heating.
The invention has the beneficial effects that:
the invention improves the existing processing technology of the polytetrafluoroethylene suspension resin, can enhance the creep resistance and weldability of the resin, and improves the basic strength.
Drawings
FIG. 1 is a schematic view of the steps of the production process for polytetrafluoroethylene suspension resin according to the invention;
Detailed Description
The details of the present invention are described below with reference to the accompanying drawings and specific embodiments.
As shown in FIG. 1, a process for producing a polytetrafluoroethylene suspension resin comprises the following steps:
s1, performing in a pre-forming mode,
pressing polytetrafluoroethylene resin powder at 20-200 ℃ and 16-64 MaP to form a blank, namely a preform;
s2, sintering the mixture,
pre-forming, putting the mixture into a mould, putting the mould and the mould into a sintering furnace for sintering, and heating the mixture to be higher than 327 ℃;
s3, cooling the mixture,
gradually cooling the blank in the sintering material to room temperature in a mould at a set cooling rate;
s4, turning and forming the blank,
turning the polytetrafluoroethylene suspension resin blank into a sheet or a film with a certain thickness;
s5, casting and pressing the steel plate,
heating the sintered preform or sheet to 320 ℃ and pressing the heated preform or sheet into a mold with the temperature of over 180 ℃ for secondary molding;
s6, extruding the mixture,
the polytetrafluoroethylene suspension resin is continuously fed into a screw or ram extruder where the material is compacted at the head through a sintering zone and then cooled to process elongated products such as rods and tubes.
In practical applications, S1. in the preforming step, the polytetrafluoroethylene resin powder should be sieved with a fine sieve to break up the agglomerated powder.
In practical application, S2, in the sintering step, the temperature distribution on the workpiece is uniform, and the temperature difference is controlled within +/-5 ℃; the sintering furnace should be equipped with an exhaust channel or fan to exhaust the exhaust gas; the furnace door is provided with a linkage mechanism, and the circulating fan can stop when the furnace door is opened; the sintering furnace should have a good thermal insulation so that the cooling rate does not exceed 20 ℃/h when the door is closed for cooling.
In practical application, in the step S3, water circulation is adopted to accelerate cooling.
In practical application, S5, in the step of die casting, a press capable of rapidly rising is selected for the die casting machine, the pressure needs to reach 64MPa, a heating furnace is arranged on the press, and the sintering parison can keep constant temperature at 320 ℃ during die casting; the die is a full-pressure die made of heat-treated nickel-chromium steel and is heated by hot oil circulation or electric heating.
In conclusion, the invention improves the existing processing technology of the polytetrafluoroethylene suspension resin, can enhance the creep resistance and weldability of the resin, and improves the basic strength.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the technical spirit and features of the present invention, and the present invention is not limited thereto but may be implemented by those skilled in the art.
Claims (5)
1. A processing and production process of polytetrafluoroethylene suspension resin is characterized by comprising the following steps: the method comprises the following steps:
s1, performing in a pre-forming mode,
pressing polytetrafluoroethylene resin powder at 20-200 ℃ and 16-64 MaP to form a blank, namely a preform;
s2, sintering the mixture,
pre-forming, putting the mixture into a mould, putting the mould and the mould into a sintering furnace for sintering, and heating the mixture to be higher than 327 ℃;
s3, cooling the mixture,
gradually cooling the blank in the sintering material to room temperature in a mould at a set cooling rate;
s4, turning and forming the blank,
turning the polytetrafluoroethylene suspension resin blank into a sheet or a film with a certain thickness;
s5, casting and pressing the steel plate,
heating the sintered preform or sheet to 320 ℃ and pressing the heated preform or sheet into a mold with the temperature of over 180 ℃ for secondary molding;
s6, extruding the mixture,
the polytetrafluoroethylene suspension resin is continuously fed into a screw or ram extruder where the material is compacted at the head through a sintering zone and then cooled to process elongated products such as rods and tubes.
2. The process for preparing polytetrafluoroethylene suspension resin according to claim 1, wherein: s1, in the preforming step, polytetrafluoroethylene resin powder is sieved by a fine sieve to break agglomerated powder.
3. The process for preparing polytetrafluoroethylene suspension resin according to claim 2, wherein: s2, during the sintering step, the temperature distribution on the workpiece is uniform, and the temperature difference is controlled within +/-5 ℃; the sintering furnace should be equipped with an exhaust channel or fan to exhaust the exhaust gas; the furnace door is provided with a linkage mechanism, and the circulating fan can stop when the furnace door is opened; the sintering furnace should have a good thermal insulation so that the cooling rate does not exceed 20 ℃/h when the door is closed for cooling.
4. The process for preparing polytetrafluoroethylene suspension resin according to claim 3, wherein: s3, in the cooling step, water circulation accelerated cooling can be adopted.
5. The process for preparing polytetrafluoroethylene suspension resin according to claim 4, wherein: s5, in the step of casting and pressing, a press capable of rapidly rising is selected for the die-casting machine, the pressure needs to reach 64MPa, a heating furnace is arranged on the press, and the sintering parison can be kept at a constant temperature at 320 ℃ during the die-casting; the die is a full-pressure die made of heat-treated nickel-chromium steel and is heated by hot oil circulation or electric heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911365901.XA CN111136930A (en) | 2019-12-26 | 2019-12-26 | Processing and production process of polytetrafluoroethylene suspension resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911365901.XA CN111136930A (en) | 2019-12-26 | 2019-12-26 | Processing and production process of polytetrafluoroethylene suspension resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111136930A true CN111136930A (en) | 2020-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911365901.XA Pending CN111136930A (en) | 2019-12-26 | 2019-12-26 | Processing and production process of polytetrafluoroethylene suspension resin |
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| CN (1) | CN111136930A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115519810A (en) * | 2022-09-27 | 2022-12-27 | 佛山慧氟高分子材料有限公司 | Production process of PTFE waterproof breathable film |
-
2019
- 2019-12-26 CN CN201911365901.XA patent/CN111136930A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115519810A (en) * | 2022-09-27 | 2022-12-27 | 佛山慧氟高分子材料有限公司 | Production process of PTFE waterproof breathable film |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200512 |