CN113561515A - Sintering method of polytetrafluoroethylene - Google Patents
Sintering method of polytetrafluoroethylene Download PDFInfo
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- CN113561515A CN113561515A CN202110879572.1A CN202110879572A CN113561515A CN 113561515 A CN113561515 A CN 113561515A CN 202110879572 A CN202110879572 A CN 202110879572A CN 113561515 A CN113561515 A CN 113561515A
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- sintering
- polytetrafluoroethylene
- hour
- temperature
- heating
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- 238000005245 sintering Methods 0.000 title claims abstract description 45
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 44
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 44
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 238000007493 shaping process Methods 0.000 claims abstract description 6
- 239000011347 resin Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 12
- 239000000725 suspension Substances 0.000 claims description 12
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 11
- 239000004917 carbon fiber Substances 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 1
- 238000003889 chemical engineering Methods 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- 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
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/06—Making preforms by moulding the material
- B29B11/12—Compression moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
- B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0288—Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process
-
- 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
- B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
-
- 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
-
- 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
- B29K2201/00—Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, as reinforcement
Abstract
The invention belongs to the technical field of chemistry and chemical engineering, and particularly relates to a sintering method of polytetrafluoroethylene. The method comprises the following steps: preparing materials and pressing a film; adding aluminum plates above and below the compression molded polytetrafluoroethylene sample for protection and then sintering, freely heating to 300 ℃ during sintering, keeping the temperature for half an hour at constant temperature, then heating to 340 ℃ and preserving heat for 1 hour, then freely heating to 375 ℃ and preserving heat for 2 hours, then cooling to 310 ℃ and preserving heat for 1 hour, and then cooling to 100 ℃; taking out, adjusting and shaping. The invention adopts one-step sintering, avoids oxidation caused by air contact during multi-step sintering, and improves the service performance of the product. Meanwhile, before sintering, the upper and lower aluminum plates are used for protection, so that the phenomenon that the contact part with the oven is blackened in the sintering process can be effectively prevented, and the appearance of the product is improved.
Description
Technical Field
The invention belongs to the technical field of chemistry and chemical engineering, and particularly relates to a sintering method of polytetrafluoroethylene.
Background
Polytetrafluoroethylene PTFE is a high molecular polymer prepared by polymerizing tetrafluoroethylene as a monomer, and is commonly called "plastic king". Has corrosion resistance, is inert to most chemicals and solvents, and can resist strong acid, strong alkali, water and various organic solvents. Meanwhile, the polytetrafluoroethylene has the characteristics of high temperature resistance and low temperature resistance, and is high temperature resistant, and the use working temperature reaches 250 ℃. Low temperature resistance, good mechanical toughness at low temperature, and 5 percent of elongation rate can be maintained even if the temperature is reduced to-196 ℃. Good weatherability and optimal aging life in plastics. High lubrication, the lowest coefficient of friction in solid materials.
In general, polytetrafluoroethylene has excellent chemical stability, corrosion resistance, sealing property, high lubrication non-stick property, electrical insulation property and good ageing resistance, so that the polytetrafluoroethylene has wide application. For example, the preparation method is used for preparing insulating devices in the electrical industry, the industries of aerospace, aviation, electronics, instruments, computers and the like, and is used for preparing corrosion-resistant devices in the fields of electrical appliances, chemical engineering, aviation, machinery and the like.
Sintering is a very important link in the production and processing process of polytetrafluoroethylene products, the calcining temperature, the calcining time and cooling all relate to the physical and mechanical properties of finished products, the sintering process in the prior art is generally complicated, drying is needed firstly, and nitrogen is also needed to be introduced in the sintering process.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a polytetrafluoroethylene sintering method, which is one-step sintering and has the advantages of simple process and high automation degree.
The present invention achieves the above-described object by the following technical means.
A sintering method of polytetrafluoroethylene comprises the following steps:
(1) preparing materials: placing the polytetrafluoroethylene suspension resin in a mould, and pressing the mould;
(2) pre-sintering treatment: cleaning the inside of the oven, adding aluminum plates to protect the upper and lower parts of the polytetrafluoroethylene sample which is die-molded in the step (1), and then integrally placing the polytetrafluoroethylene sample in the oven;
(3) and (3) sintering: heating the oven to a sintering temperature, and starting a blower to uniformly distribute the temperature in the oven; heating to 300 ℃, keeping the temperature for half an hour, heating to 340 ℃, preserving heat for 1 hour, heating to 375 ℃, preserving heat for 2 hours, cooling to 310 ℃, preserving heat for 1 hour, and then cooling to 100 ℃;
(4) and (4) taking out the sintered sample obtained in the step (3), adjusting and shaping.
In the step (1), the particle size of the polytetrafluoroethylene suspension resin is 170-270 μm, and the polytetrafluoroethylene suspension resin is pressed into a plate shape, a rod shape or a tube shape;
in the step (1), the raw materials also comprise carbon fibers, the adding amount of the carbon fibers is 5-10% of the mass of the polytetrafluoroethylene suspension resin, and after the carbon fibers are added, the carbon fibers are uniformly stirred and then pressed into a film.
In the step (3), the temperature rise is programmed temperature rise or free temperature rise.
Further, the heating mode is as follows: freely heating to 300 ℃, keeping the temperature for half an hour, then heating to 340 ℃, preserving the heat for 1 hour, then freely heating to 375 ℃, preserving the heat for 2 hours, then cooling to 310 ℃, preserving the heat for 1 hour, and then cooling to 100 ℃.
The invention has the beneficial effects that:
(1) the invention adopts one-step sintering, avoids oxidation caused by air contact during multi-step sintering, and improves the service performance of the product. And the requirement on temperature rise is low, and the product performance can be ensured by programmed temperature rise or free temperature rise.
(2) According to the invention, the upper and lower aluminum plates are adopted for protection before sintering, so that the phenomenon that the contact part with the oven is blackened in the sintering process can be effectively prevented, and the appearance of the product is improved.
Drawings
FIG. 1 is a control diagram of the sintering temperature of the present invention.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
Example 1
A sintering method of polytetrafluoroethylene comprises the following steps:
(1) preparing materials: placing polytetrafluoroethylene suspension resin with the particle size of 200 mu m in a mould, and pressing a film;
(2) pre-sintering treatment: cleaning the inside of the oven, adding aluminum plates to protect the upper and lower parts of the polytetrafluoroethylene sample which is die-molded in the step (1), and then integrally placing the polytetrafluoroethylene sample in the oven;
(3) and (3) sintering: heating the baking oven to a sintering temperature by a program, and starting a blower to uniformly distribute the temperature in the baking oven; freely heating to 300 ℃, keeping the temperature for half an hour, then heating to 340 ℃, preserving the heat for 1 hour, then freely heating to 375 ℃, preserving the heat for 2 hours, then cooling to 310 ℃, preserving the heat for 1 hour, and then cooling to 100 ℃;
(4) and (4) taking out the sintered sample obtained in the step (3), adjusting and shaping.
Example 2
A sintering method of polytetrafluoroethylene comprises the following steps:
(1) preparing materials: placing polytetrafluoroethylene suspension resin with the particle size of 230 mu m and carbon fiber in a mold, and pressing the mold; the addition amount of the carbon fiber is 5 percent of the mass of the polytetrafluoroethylene suspension resin;
(2) pre-sintering treatment: cleaning the inside of the oven, adding aluminum plates to protect the upper and lower parts of the polytetrafluoroethylene sample which is die-molded in the step (1), and then integrally placing the polytetrafluoroethylene sample in the oven;
(3) and (3) sintering: heating the baking oven to a sintering temperature by a program, and starting a blower to uniformly distribute the temperature in the baking oven; freely heating to 300 ℃, keeping the temperature for half an hour, then heating to 340 ℃, preserving the heat for 1 hour, then freely heating to 375 ℃, preserving the heat for 2 hours, then cooling to 310 ℃, preserving the heat for 1 hour, and then cooling to 100 ℃;
(4) and (4) taking out the sintered sample obtained in the step (3), adjusting and shaping.
Example 3
A sintering method of polytetrafluoroethylene comprises the following steps:
(1) preparing materials: placing polytetrafluoroethylene suspension resin with the particle size of 250 mu m and carbon fiber in a mold, and pressing the mold; the adding amount of the carbon fiber is 10 percent of the mass of the polytetrafluoroethylene suspension resin;
(2) pre-sintering treatment: cleaning the inside of the oven, adding aluminum plates to protect the upper and lower parts of the polytetrafluoroethylene sample which is die-molded in the step (1), and then integrally placing the polytetrafluoroethylene sample in the oven;
(3) and (3) sintering: heating the baking oven to a sintering temperature by a program, and starting a blower to uniformly distribute the temperature in the baking oven; freely heating to 300 ℃, keeping the temperature for half an hour, then heating to 340 ℃, preserving the heat for 1 hour, then freely heating to 375 ℃, preserving the heat for 2 hours, then cooling to 310 ℃, preserving the heat for 1 hour, and then cooling to 100 ℃;
(4) and (4) taking out the sintered sample obtained in the step (3), adjusting and shaping.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (6)
1. A method for sintering polytetrafluoroethylene is characterized by comprising the following steps:
(1) preparing materials: placing the polytetrafluoroethylene suspension resin in a mould, and pressing the mould;
(2) pre-sintering treatment: cleaning the inside of the oven, adding aluminum plates to protect the upper and lower parts of the polytetrafluoroethylene sample which is die-molded in the step (1), and then integrally placing the polytetrafluoroethylene sample in the oven;
(3) and (3) sintering: heating to 300 ℃, keeping the temperature for half an hour, heating to 340 ℃, preserving heat for 1 hour, heating to 375 ℃, preserving heat for 2 hours, cooling to 310 ℃, preserving heat for 1 hour, and then cooling to 100 ℃;
(4) and (4) taking out the sintered sample obtained in the step (3), adjusting and shaping.
2. The method for sintering polytetrafluoroethylene according to claim 1, wherein in step (1), the particle size of the polytetrafluoroethylene suspension resin is 170-270 μm.
3. The method for sintering polytetrafluoroethylene according to claim 1, wherein in step (1), the plate-like, rod-like or tube-like shape is press-molded.
4. The method for sintering polytetrafluoroethylene as claimed in claim 1, wherein in step (1), the raw materials further comprise carbon fibers, the addition amount of the carbon fibers is 5-10% of the mass of the polytetrafluoroethylene suspension resin, and after the carbon fibers are added, the mixture is stirred uniformly and pressed into a film.
5. The method for sintering polytetrafluoroethylene according to claim 1, wherein in step (3), the temperature is raised to the sintering temperature by programmed temperature raising or free temperature raising, and the blower is turned on to uniformly distribute the temperature in the oven.
6. The method for sintering polytetrafluoroethylene according to claim 1, wherein in the step (3), the temperature is raised in such a manner that: freely heating to 300 ℃, keeping the temperature for half an hour, then heating to 340 ℃, preserving the heat for 1 hour, then freely heating to 375 ℃, preserving the heat for 2 hours, then cooling to 310 ℃, preserving the heat for 1 hour, and then cooling to 100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110879572.1A CN113561515A (en) | 2021-08-02 | 2021-08-02 | Sintering method of polytetrafluoroethylene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110879572.1A CN113561515A (en) | 2021-08-02 | 2021-08-02 | Sintering method of polytetrafluoroethylene |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113561515A true CN113561515A (en) | 2021-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110879572.1A Pending CN113561515A (en) | 2021-08-02 | 2021-08-02 | Sintering method of polytetrafluoroethylene |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104723567A (en) * | 2015-02-25 | 2015-06-24 | 中昊晨光化工研究院有限公司 | Forming method for modified polytetrafluoroethylene plastic product |
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2021
- 2021-08-02 CN CN202110879572.1A patent/CN113561515A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104723567A (en) * | 2015-02-25 | 2015-06-24 | 中昊晨光化工研究院有限公司 | Forming method for modified polytetrafluoroethylene plastic product |
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Application publication date: 20211029 |