CN114085481A - Modified formula for enhancing toughness and service life of polytetrafluoroethylene - Google Patents
Modified formula for enhancing toughness and service life of polytetrafluoroethylene Download PDFInfo
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- CN114085481A CN114085481A CN202111551923.2A CN202111551923A CN114085481A CN 114085481 A CN114085481 A CN 114085481A CN 202111551923 A CN202111551923 A CN 202111551923A CN 114085481 A CN114085481 A CN 114085481A
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- Prior art keywords
- polytetrafluoroethylene
- service life
- powder
- modified formula
- toughness
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- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 50
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 46
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 46
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 36
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 238000007723 die pressing method Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims description 45
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000003825 pressing Methods 0.000 claims description 18
- 239000004595 color masterbatch Substances 0.000 claims description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- 229910017052 cobalt Inorganic materials 0.000 claims description 12
- 239000010941 cobalt Substances 0.000 claims description 12
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000000465 moulding Methods 0.000 claims description 11
- 239000012535 impurity Substances 0.000 claims description 6
- 238000000462 isostatic pressing Methods 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 229910052596 spinel Inorganic materials 0.000 claims description 6
- 239000011029 spinel Substances 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 6
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 6
- 238000007789 sealing Methods 0.000 abstract description 22
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000035939 shock Effects 0.000 abstract description 4
- 239000000446 fuel Substances 0.000 abstract description 3
- 238000009472 formulation Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
Abstract
The invention relates to the technical field of polytetrafluoroethylene production, and discloses a modified formula for enhancing the toughness and service life of polytetrafluoroethylene, which comprises the following steps: s1, preparing raw materials; s2, mixing materials; s3, die pressing; s4, sintering; the modified polytetrafluoroethylene produced by the invention can ensure that the turbocharging bypass valve of a fuel automobile has better sealing performance and can bear more than three million thermal shock tests, thereby simultaneously considering the service life of a sealing product and ensuring that the sealing product can play a sealing function in a required service cycle.
Description
Technical Field
The invention belongs to the technical field of polytetrafluoroethylene production, and particularly relates to a modified formula for enhancing the toughness and service life of polytetrafluoroethylene.
Background
At present, the sealing of the vehicle-mounted turbine bypass valve is mainly of a double-lip structure, the sealing performance and the service life of a single-lip structure are poor, the hardness of a sealing product produced and manufactured by a modified polytetrafluoroethylene formula on the market is large, the sealing surface cannot be well attached, the sealing performance is reduced, and meanwhile, million times of service life tests required by automobile tests are difficult to pass under the condition of meeting the sealing performance.
The normal modified polytetrafluoroethylene has the hardness higher than that of pure polytetrafluoroethylene, the strength is high, but the toughness is poor, for an application scene like the sealing of a turbocharging bypass valve, the sealing performance needs to be considered, the service life needs to be considered, the normal modified polytetrafluoroethylene formula hardly meets the required toughness requirement so as to realize single-lip compression sealing, and the service life requirement of a million times thermal shock test cannot be met.
Therefore, a modified formula for enhancing the toughness and the service life of the polytetrafluoroethylene is provided.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a modified formula for enhancing the toughness and the service life of polytetrafluoroethylene.
In order to achieve the purpose, the invention provides the following technical scheme:
a modified formula for enhancing the toughness and service life of polytetrafluoroethylene comprises the following steps:
s1: preparing raw materials, namely selecting raw materials of 90-95% of pure polytetrafluoroethylene powder and 5-10% of organic color master batch powder in weight ratio;
s2: mixing materials, namely placing the tetrafluoroethylene powder obtained in the step S1 and the organic color masterbatch powder into mixed impurities for mixing to obtain a mixed raw material;
s3: die pressing, namely placing the mixed raw material obtained in the step S2 into a die pressing device, and forming a raw material blank by an isostatic pressing film pressing process;
s4: and (4) sintering, and heating and molding the raw material blank obtained in the step (S3) by a heating device.
Preferably, the pure polytetrafluoroethylene powder in S1 is 100% suspension polytetrafluoroethylene resin, the appearance is white powder, the technical index requirement of tensile strength is more than or equal to 27.6MPa, and the technical index requirement of elongation at break is more than or equal to 300.
Preferably, the inorganic color master batch powder in S1 contains 100% of cobalt and aluminum as blue spinel, wherein the normal cobalt accounts for 60% -70%, and the aluminum accounts for 30% -40%.
Preferably, the mixing device in S2 is a mixer, the mixer can adjust the temperature, humidity and rotation speed, the temperature in the mixing device is 15 ℃ to 25 ℃, the humidity is 30% to 85%, and the rotation speed is 3000 r/min.
Preferably, the molding device in S3 is a molding press operating at a pressure of 20 to 50 Mpa.
Preferably, the heating device in S4 is an industrial oven, and the operating temperature of the industrial oven is 370-.
Preferably, the weight ratio of the polytetrafluoroethylene to the inorganic color masterbatch powder in S1 is 95% and 5%, respectively.
Compared with the prior art, the invention provides a modified formula for enhancing the toughness and service life of polytetrafluoroethylene, and the modified formula has the following beneficial effects:
1. the modified polytetrafluoroethylene produced by the invention can ensure that the turbine booster bypass valve of the fuel automobile has better sealing performance and can bear more than three million thermal shock tests, thereby simultaneously giving consideration to the service life of a sealing product and ensuring that the sealing product can play a sealing function in a required service cycle;
2. the invention has the advantages of lower requirement on machines, simple process, simple steps, mechanical production in the production process, higher degree of mechanization, lower material requirement, batch production, lower production cost, higher economic benefit, green and pollution-free production process, reduction of burden on the environment and more environmental protection.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 shows the performance parameters of inorganic color master batch powder in a modified formula for enhancing the toughness and service life of polytetrafluoroethylene;
FIG. 2 is a production flow chart of a modified formula for enhancing the toughness and service life of polytetrafluoroethylene.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 1, a modified formulation for enhancing toughness and lifespan of ptfe comprises the following steps:
s1: preparing raw materials, namely selecting raw materials of 91 percent of pure polytetrafluoroethylene powder and 9 percent of organic color master batch powder in a weight ratio;
s2: mixing materials, namely placing the tetrafluoroethylene powder obtained in the step S1 and the organic color masterbatch powder into mixed impurities for mixing to obtain a mixed raw material;
s3: die pressing, namely placing the mixed raw material obtained in the step S2 into a die pressing device, and forming a raw material blank by an isostatic pressing film pressing process;
s4: and (4) sintering, and heating and molding the raw material blank obtained in the step (S3) by a heating device.
The pure polytetrafluoroethylene powder in S1 is 100% suspension polytetrafluoroethylene resin, the appearance is white powder, the technical index requirement of tensile strength is more than or equal to 27.6MPa, and the technical index requirement of elongation at break is more than or equal to 300.
The inorganic color master powder in S1 contains blue spinel composed of 100% of cobalt and aluminum, wherein the normal cobalt accounts for 60% and the aluminum accounts for 40%.
And S2, the mixing device is a mixer, the mixer can adjust the temperature, the humidity and the rotating speed, the temperature in the mixing device is 25 ℃, the humidity is 55%, and the rotating speed is 3000 r/min.
And S3, setting the mould pressing machine as a mould pressing machine, wherein the pressure of the mould pressing machine during operation is 30 Mpa.
The heating device in the S4 is an industrial oven, and the temperature of the industrial oven during operation is 370-385 ℃.
Example 2:
referring to fig. 1, a modified formulation for enhancing toughness and lifespan of ptfe comprises the following steps:
s1: preparing raw materials, namely selecting raw materials of 95 percent of pure polytetrafluoroethylene powder and 5 percent of organic color master batch powder in weight ratio for preparation;
s2: mixing materials, namely placing the tetrafluoroethylene powder obtained in the step S1 and the organic color masterbatch powder into mixed impurities for mixing to obtain a mixed raw material;
s3: die pressing, namely placing the mixed raw material obtained in the step S2 into a die pressing device, and forming a raw material blank by an isostatic pressing film pressing process;
s4: and (4) sintering, and heating and molding the raw material blank obtained in the step (S3) by a heating device.
The pure polytetrafluoroethylene powder in S1 is 100% suspension polytetrafluoroethylene resin, the appearance is white powder, the technical index requirement of tensile strength is more than or equal to 27.6MPa, and the technical index requirement of elongation at break is more than or equal to 300.
The inorganic color master powder in S1 contains blue spinel composed of 100% of cobalt and aluminum, 60% -70% of normal cobalt and 30% -40% of aluminum.
And S2, the mixing device is a mixer, the mixer can adjust the temperature, the humidity and the rotating speed, the temperature in the mixing device is 20 ℃, the humidity is 60%, and the rotating speed is 3000 r/min.
And S3, setting the mould pressing machine as a mould pressing machine, wherein the pressure of the mould pressing machine in operation is 35 Mpa.
The heating device in the S4 is an industrial oven, and the temperature of the industrial oven during operation is 370-385 ℃.
Example 3:
referring to fig. 1, a modified formulation for enhancing toughness and lifespan of ptfe comprises the following steps:
s1: preparing raw materials, namely selecting 93 percent of pure polytetrafluoroethylene powder and 7 percent of organic color master batch powder in weight ratio;
s2: mixing materials, namely placing the tetrafluoroethylene powder obtained in the step S1 and the organic color masterbatch powder into mixed impurities for mixing to obtain a mixed raw material;
s3: die pressing, namely placing the mixed raw material obtained in the step S2 into a die pressing device, and forming a raw material blank by an isostatic pressing film pressing process;
s4: and (4) sintering, and heating and molding the raw material blank obtained in the step (S3) by a heating device.
The pure polytetrafluoroethylene powder in S1 is 100% suspension polytetrafluoroethylene resin, the appearance is white powder, the technical index requirement of tensile strength is more than or equal to 27.6MPa, and the technical index requirement of elongation at break is more than or equal to 300.
The inorganic color master powder in S1 contains blue spinel composed of 100% of cobalt and aluminum, 60% -70% of normal cobalt and 30% -40% of aluminum.
And S2, the mixing device is a mixer, the mixer can adjust the temperature, the humidity and the rotating speed, the temperature in the mixing device is 15 ℃, the humidity in the mixing device is 65%, and the rotating speed is 3000 r/min.
And S3, setting the mould pressing machine as a mould pressing machine, wherein the pressure of the mould pressing machine during operation is 40 Mpa.
The heating device in the S4 is an industrial oven, and the temperature of the industrial oven during operation is 370-385 ℃.
Example 4:
referring to fig. 1, a modified formulation for enhancing toughness and lifespan of ptfe comprises the following steps:
s1: preparing raw materials, namely selecting raw materials with the weight ratio of 90 percent of pure polytetrafluoroethylene powder to 10 percent of organic color master batch powder for preparation;
s2: mixing materials, namely placing the tetrafluoroethylene powder obtained in the step S1 and the organic color masterbatch powder into mixed impurities for mixing to obtain a mixed raw material;
s3: die pressing, namely placing the mixed raw material obtained in the step S2 into a die pressing device, and forming a raw material blank by an isostatic pressing film pressing process;
s4: and (4) sintering, and heating and molding the raw material blank obtained in the step (S3) by a heating device.
The pure polytetrafluoroethylene powder in S1 is 100% suspension polytetrafluoroethylene resin, the appearance is white powder, the technical index requirement of tensile strength is more than or equal to 27.6MPa, and the technical index requirement of elongation at break is more than or equal to 300.
The inorganic color master powder in S1 contains blue spinel composed of 100% of cobalt and aluminum, 60% -70% of normal cobalt and 30% -40% of aluminum.
And S2, the mixing device is a mixer, the mixer can adjust the temperature, the humidity and the rotating speed, the temperature in the mixing device is 15 ℃, the humidity is 30 percent, and the rotating speed is 3000 r/min.
And S3, setting the mould pressing machine as a mould pressing machine, wherein the pressure of the mould pressing machine in operation is 20 Mpa.
And the heating device in the S4 is an industrial oven, and the temperature of the industrial oven during operation is 370 ℃.
The sealing product made of the modified polytetrafluoroethylene produced in the second embodiment has the best effect, can enable the sealing performance of the turbocharging bypass valve of the fuel automobile to be better, and can bear more than three million thermal shock tests, so that the service life of the sealing product is considered, and the sealing product can play a sealing function in a required service cycle.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A modified formula for enhancing the toughness and service life of polytetrafluoroethylene is characterized in that: comprises the following steps;
s1: preparing raw materials, namely selecting raw materials of 90-95% of pure polytetrafluoroethylene powder and 5-10% of organic color master batch powder in weight ratio;
s2: mixing materials, namely placing the tetrafluoroethylene powder obtained in the step S1 and the organic color masterbatch powder into mixed impurities for mixing to obtain a mixed raw material;
s3: die pressing, namely placing the mixed raw material obtained in the step S2 into a die pressing device, and forming a raw material blank by an isostatic pressing film pressing process;
s4: and (4) sintering, and heating and molding the raw material blank obtained in the step (S3) by a heating device.
2. The modified formula for enhancing toughness and service life of polytetrafluoroethylene according to claim 1, wherein: the pure polytetrafluoroethylene powder in S1 is 100% suspension polytetrafluoroethylene resin, the appearance is white powder, the technical index requirement of tensile strength is more than or equal to 27.6MPa, and the technical index requirement of elongation at break is more than or equal to 300.
3. The modified formula for enhancing toughness and service life of polytetrafluoroethylene according to claim 1, wherein: the inorganic color master batch powder in S1 contains blue spinel composed of 100% of cobalt and aluminum, wherein the normal cobalt accounts for 60% -70%, and the aluminum accounts for 30% -40%.
4. The modified formula for enhancing toughness and service life of polytetrafluoroethylene according to claim 1, wherein: the mixing device in the S2 is a mixer, the mixer can adjust the temperature, the humidity and the rotating speed, the temperature in the mixing device is 15-25 ℃, the humidity is 30-85%, and the rotating speed is 3000 r/min.
5. The modified formula for enhancing toughness and service life of polytetrafluoroethylene according to claim 1, wherein: and S3, the molding device is a molding press, and the pressure of the molding press during operation is 20-50 Mpa.
6. The modified formula for enhancing toughness and service life of polytetrafluoroethylene according to claim 1, wherein: the heating device in the S4 is an industrial oven, and the temperature of the industrial oven during operation is 370-385 ℃.
7. The modified formula for enhancing toughness and service life of polytetrafluoroethylene according to claim 1, wherein: in S1, the weight ratio of the polytetrafluoroethylene to the inorganic color master batch powder is 95% and 5%, respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111551923.2A CN114085481A (en) | 2021-12-17 | 2021-12-17 | Modified formula for enhancing toughness and service life of polytetrafluoroethylene |
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| CN202111551923.2A CN114085481A (en) | 2021-12-17 | 2021-12-17 | Modified formula for enhancing toughness and service life of polytetrafluoroethylene |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050182216A1 (en) * | 2002-11-22 | 2005-08-18 | Morgan Richard A. | Directly polymerized low molecular weight granular polytetrafluoroethylene |
| CN105001565A (en) * | 2015-06-29 | 2015-10-28 | 平高集团有限公司 | Teflon composite material, arc extinguishing nozzle, preparation method of arc extinguishing nozzle and high-voltage circuit breaker |
| CN106859659A (en) * | 2017-02-14 | 2017-06-20 | 西南政法大学 | The preparation of cobalt/aluminium compound blue nanometer powder and its finger mark process for show |
| CN110256790A (en) * | 2019-07-09 | 2019-09-20 | 辽宁华兴橡塑制品有限公司 | The soluble polytetrafluoroethylmodified modified sealing element of high temperature high voltage resistant and production technology |
-
2021
- 2021-12-17 CN CN202111551923.2A patent/CN114085481A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050182216A1 (en) * | 2002-11-22 | 2005-08-18 | Morgan Richard A. | Directly polymerized low molecular weight granular polytetrafluoroethylene |
| CN105001565A (en) * | 2015-06-29 | 2015-10-28 | 平高集团有限公司 | Teflon composite material, arc extinguishing nozzle, preparation method of arc extinguishing nozzle and high-voltage circuit breaker |
| CN106859659A (en) * | 2017-02-14 | 2017-06-20 | 西南政法大学 | The preparation of cobalt/aluminium compound blue nanometer powder and its finger mark process for show |
| CN110256790A (en) * | 2019-07-09 | 2019-09-20 | 辽宁华兴橡塑制品有限公司 | The soluble polytetrafluoroethylmodified modified sealing element of high temperature high voltage resistant and production technology |
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Application publication date: 20220225 |
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