CN102718907B - Preparation method of ethylene-tetrafluoroethylene copolymer resin - Google Patents
Preparation method of ethylene-tetrafluoroethylene copolymer resin Download PDFInfo
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- CN102718907B CN102718907B CN201210211170.5A CN201210211170A CN102718907B CN 102718907 B CN102718907 B CN 102718907B CN 201210211170 A CN201210211170 A CN 201210211170A CN 102718907 B CN102718907 B CN 102718907B
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- reaction kettle
- mixing tank
- polymerization reaction
- ethylene
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- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 title claims abstract description 22
- 229920005989 resin Polymers 0.000 title claims abstract description 10
- 239000011347 resin Substances 0.000 title claims abstract description 10
- 238000002360 preparation method Methods 0.000 title claims description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000000178 monomer Substances 0.000 claims abstract description 8
- 229920006026 co-polymeric resin Polymers 0.000 claims abstract description 6
- 239000011790 ferrous sulphate Substances 0.000 claims description 17
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 17
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 15
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 15
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 12
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 10
- 239000005977 Ethylene Substances 0.000 claims description 10
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 10
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 4
- 239000003999 initiator Substances 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 230000000977 initiatory effect Effects 0.000 abstract description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract description 8
- 150000002978 peroxides Chemical class 0.000 abstract description 7
- -1 Polytetrafluoroethylene Polymers 0.000 abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 229920002313 fluoropolymer Polymers 0.000 abstract description 3
- 239000012966 redox initiator Substances 0.000 abstract description 3
- 229920005603 alternating copolymer Polymers 0.000 abstract 1
- 230000033116 oxidation-reduction process Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 description 13
- 230000008018 melting Effects 0.000 description 13
- VAZSKTXWXKYQJF-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)OOS([O-])=O VAZSKTXWXKYQJF-UHFFFAOYSA-N 0.000 description 8
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 7
- 229910052731 fluorine Inorganic materials 0.000 description 7
- 239000011737 fluorine Substances 0.000 description 7
- 238000002441 X-ray diffraction Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000007334 copolymerization reaction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000000921 elemental analysis Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012934 organic peroxide initiator Substances 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Polymerisation Methods In General (AREA)
Abstract
The invention relates to a method for preparing ethylene-tetrafluoroethylene copolymer resin by utilizing an inorganic oxidation-reduction system, which solves the technical problems of high initiation temperature of inorganic peroxides and adverse influence on alternating structures, and belongs to the technical field of fluoroplastics. The method is characterized in that an independent gas-mixing tank and a pressurizing system of the gas-mixing tank are arranged, and the gas-mixing tank and a reaction kettle are connected through a check valve, so that gas can only flow from the mixing groove to the reaction kettle in a unidirectional manner; during polymerization reaction, the temperature is reduced to 10 DEG C and is kept constant, the following monomer is added and supplied in the form of mixed gas, and constant pressure is kept in the kettle; and the polymerization reaction adopts an ammonium persulfate-ferrisulphas inorganic redox initiation system. The method has the beneficial effects that the initiation temperature of the inorganic peroxides is lowered, the prepared copolymer resin is in an alternating copolymer structure, radiation-resisting and mechanical performances are improved to a great degree while the good performance of PTFE (Polytetrafluoroethylene) is kept, and the tensile strength can reach 50MPa which is approximately twice as that of the PTFE.
Description
Technical Field
The invention belongs to the technical field of fluorine-containing plastics and preparation methods thereof, relates to a preparation method of ethylene-tetrafluoroethylene copolymer resin, and particularly relates to a method for preparing the ethylene-tetrafluoroethylene copolymer resin by initiating an inorganic redox system.
Background
The ethylene-tetrafluoroethylene (ETFE) copolymer resin is used as a crystalline high polymer, has a melting point of 256-280 ℃, can be self-extinguished during combustion, is the most tough fluoroplastic, has high shear mechanical strength and low-temperature impact resistance, is the best of the existing fluoroplastics, maintains the good heat resistance, chemical resistance and electrical insulation performance of Polytetrafluoroethylene (PTFE), greatly improves the radiation resistance and mechanical performance, and has the tensile strength of 50MPa which is 2 times that of the PTFE. The use temperature is usually set between-65 ℃ and 150 ℃.
ETFE is prepared by copolymerizing two monomers of ethylene and tetrafluoroethylene, the copolymerization structure is divided into four types of block, random, graft and alternating, for the ETFE, the molecular rigidity and the crystallinity of the alternating structure are the highest, the structural defect that the molar ratio of the components deviates from 50/50 influences the crystal form of the polymer, so that the melting point and the glass transition temperature are reduced, and particularly when the ethylene ratio is higher, the difference between the decomposition temperature and the melting point of the polymer is smaller, so that the forming processing is not facilitated.
In the domestic related reports about ETFE, only the processing and application fields are involved, and no related patent report in the aspect of polymerization preparation is found; the foreign ETFE preparation process adopts an organic peroxide initiator, and has the advantages of no need of molecular tail end group treatment and high initiator cost and harsh storage and use conditions. In contrast, inorganic peroxides (such as ammonium persulfate and the like) have low cost and do not need special solvents, but the initiation temperature of the inorganic peroxide during the polymerization of ETFE needs to be higher than 60 ℃, while the low temperature in the copolymerization reaction is favorable for the formation of the ETFE with an alternating structure, and the initiation temperature of the inorganic peroxide is higher, so that the alternating structure is adversely affected.
Disclosure of Invention
The invention aims to provide a preparation method of ethylene-tetrafluoroethylene copolymer resin which adopts an inorganic initiation system and is beneficial to the ETFE copolymerization with an alternate structure.
In order to achieve the purpose, the technical scheme is as follows: a preparation method of ethylene-tetrafluoroethylene copolymer resin is characterized by comprising the following steps:
the polymerization reaction kettle is connected with the gas mixing tank through a check valve, so that gas can only flow from the mixing tank to the reaction kettle in a one-way mode;
adding an ammonium persulfate solution with the mass percentage concentration of 1 thousandth into a polymerization reaction kettle, controlling the reaction temperature to be 10 ℃ and keeping the temperature constant, filling tetrafluoroethylene and ethylene monomers into the polymerization reaction kettle, enabling the absolute pressure-partial pressure ratio of the tetrafluoroethylene to the ethylene to be 7: 3, adding a ferrous sulfate solution with the mass percentage concentration of 1% within 2 hours at a constant speed, wherein the adding amount (volume ratio) is as follows: ferrous sulfate to ammonium persulfate ratio of 3 to 20; pressurizing the mixed gas in the gas mixing tank and then filling the pressurized mixed gas into a polymerization reaction kettle in the process of adding ferrous sulfate, and supplementing and adding subsequent monomers in a mixed gas mode to keep the polymerization reaction kettle at a constant pressure; finishing the reaction after 20 minutes after the ferrous sulfate solution is added, discharging the residual gas out of the reaction kettle by using a vacuum pump, opening the kettle and collecting the material;
repeatedly washing the obtained materials with deionized water for more than three times, and removing the residual initiator until the measured conductivity of the filtrate is reduced to below 1 mu S/m; and finally, drying at the temperature of not higher than 150 ℃ to obtain the ETFE copolymer resin in a solid powder state.
The invention has the beneficial effects that: the method for preparing the ethylene-tetrafluoroethylene by initiating the inorganic redox system not only avoids the problems of high cost and harsh use conditions of organic peroxide, but also overcomes the defects of high initiation temperature and adverse influence on an alternate structure of the inorganic peroxide. The invention reduces the initiation temperature of inorganic peroxide, and the molecular structural formula of the prepared copolymer resin polymer is- [ CH2-CH2-CF2-CF2]nThe composite material has an alternating coalescence structure, high shear mechanical strength and good low-temperature impact resistance, maintains the good performance of PTFE, improves the radiation resistance and the mechanical performance to a great extent, and has tensile strength of 50MPa which is 2 times that of PTFE.
Detailed Description
The following examples further illustrate the present invention and are intended to enable one of ordinary skill in the art to understand and practice the present invention. It is to be noted, however, that the present invention is not limited to the preferred embodiments disclosed, and that any obvious modifications or equivalents thereof, based on the teachings of the present invention, should also be considered as falling within the scope of the present invention.
The invention designs an independent gas mixing tank and a pressurization system thereof, wherein the gas mixing tank is externally connected with a circulating return pipeline and a pressurization buffer pipeline, and the gas mixing tank is connected with a reaction kettle by a check valve, so that gas can only flow from the mixing tank to the reaction kettle in a one-way manner. When the polymerization reaction is carried out, the subsequent monomers are supplemented and added in a mixed gas form, and the constant pressure in the kettle is kept; in the polymerization reaction, an ammonium persulfate-ferrous sulfate inorganic redox initiation system is adopted, and the ammonium persulfate-ferrous sulfate inorganic redox initiation system is added in a quantitative and continuous adding mode in the whole process.
In the examples, the materials were in mass percent unless otherwise noted. Wherein,
the ferrous sulfate solution has the mass percent concentration of 1 percent, and the ammonium persulfate solution has the mass percent concentration of 1 per mill; the addition amount (volume ratio) is as follows: ferrous sulfate to ammonium persulfate 3: 20. The conductivity of the deionized water was 0.7. mu.S/m.
The detection items include DSC, XRD and elemental analysis.
Example 1:
a preparation method of ethylene-tetrafluoroethylene copolymer resin is characterized by comprising the following steps:
the method comprises the steps of performing evacuation replacement treatment on a gas mixing tank with the volume of 20L and related pipelines thereof, adding tetrafluoroethylene gas to gauge pressure of 0.7MPa (namely absolute pressure of 0.8 MPa), adding ethylene gas to gauge pressure of 1.5MPa (namely absolute pressure of 1.6MPa, and the absolute pressure partial pressures of tetrafluoroethylene and ethylene are all equal to 0.8MPa, namely the molar numbers are equal), and enabling the gas in the tank to flow circularly through an external circulating backflow pipeline and a pressurization buffer pipeline by using a compression pump;
adding 5L of 1 per mill ammonium persulfate solution into a 10L reaction kettle with the volume, reducing the temperature in the kettle to 10 ℃ by using a circulating thermostatic bath, adding tetrafluoroethylene gas to the gage pressure of 1.37MPa (the absolute pressure of 1.47 MPa), and then adding ethylene gas to the gage pressure of 2.0MPa (the absolute pressure of 2.1 MPa), wherein the absolute pressure partial pressures of tetrafluoroethylene and ethylene are respectively 1.47MPa and 0.63 MPa; adding 750ml of 1% ferrous sulfate solution into the reaction kettle at a constant speed by using a metering pump, adjusting the flow of the metering pump to 375ml/h, sealing a circulating reflux pipeline of the gas mixing tank, opening a pressurization buffer pipeline, pressurizing the mixed gas to gauge pressure of 2.0MPa by using a compression pump, maintaining the pressure in a polymerization stage until the reaction is finished after the ferrous sulfate solution is added and maintaining the pressure for 20 minutes, then discharging the residual gas out of the reaction kettle by using a vacuum pump, and opening the kettle to receive the material;
and step three, repeating the washing for more than three times, and removing the residual initiator until the conductivity of the filtrate is measured to be reduced to below 1 mu S/m. Then drying (not higher than 150 ℃) for 24 hours to obtain the copolymer resin in a solid powder state.
The detection result of this embodiment is: a fluorine content of 59.79%; the melting point is 278.6 ℃, and the melting peak width is 23.5 ℃; x-ray diffraction angle 18.660 ° singlet.
Example 2:
the volume of the gas mixing tank in example 1 was changed to 10L, the volume of the reaction kettle was changed to 2L, the volume of the ammonium persulfate solution was changed to 1 liter, the volume of the ferrous sulfate solution was changed to 150ml, and the flow rate of the metering pump was changed to 75ml/h, otherwise the operation was the same as that in example 1. The detection result of this embodiment is: the fluorine content is 58.99 percent; melting point 277.94 ℃, melting peak width 21 ℃; x-ray diffraction angle 18.620 ° singlet.
Example 3:
the volume of the gas mixing tank in example 1 was changed to 1000L, the volume of the reaction kettle was changed to 500L, the volume of the ammonium persulfate solution was changed to 250L, the volume of the ferrous sulfate solution was changed to 3.75L, the flow rate of the metering pump was changed to 1.875L/h, and the rest of the procedure was the same as that of example 1. The detection result of this embodiment is: the fluorine content is 59.34%; melting point 275.66 ℃, melting peak width 30.3 ℃; x-ray diffraction angle 18.780 ° singlet.
Elemental analysis characterizes the fluorine content in the polymer, and the corresponding fluorine content is 59.375 percent when the molecular quantities of the two monomer components are equal (i.e. the molar proportions are equal) through calculation; XRD characterization of X-ray diffraction Angle, -CH2-CF2A value of 18.6 ℃ is a characteristic value of the alternating structure, the other structure-CF2-CF2Diffraction angle 25 °, -CH2-CH2-19.8 °, 21.4 °, 23.7 °, 36.1 ° depending on the crystalline form, respectively; DSC can characterize the melting point of the polymer, and the molecular weight distribution range can be characterized by the melting peak width under the premise of determining the molecular structure.
The above embodiments are completed in different scale equipment, and the operability and the universality of the process are proved; the measured fluorine content and the calculated value of the embodiment 1, the embodiment 2 and the embodiment 3 respectively reach the accuracy of 99.3 percent, 99.35 percent and 99.94 percent, and the single X-ray diffraction angles are all-CH2-CF2-a characteristic value; the relative error of melting points is not more than 1 percent, the width of melting peak is not more than 30 ℃, which shows that the difference of molecular weight is small. It was confirmed that the ethylene-tetrafluoroethylene copolymer resin of the present invention has a uniform alternating structure and a uniform molecular weight distribution.
Claims (1)
1. A preparation method of ethylene-tetrafluoroethylene copolymer resin is characterized by comprising the following steps:
the polymerization reaction kettle is connected with the gas mixing tank through a check valve, so that gas can only flow from the gas mixing tank to the reaction kettle in one direction;
adding an ammonium persulfate solution with the mass percentage concentration of 1 thousandth into a polymerization reaction kettle, controlling the reaction temperature to be 10 ℃ and keeping the temperature constant, filling tetrafluoroethylene and ethylene monomers into the polymerization reaction kettle, enabling the absolute pressure-partial pressure ratio of the tetrafluoroethylene to the ethylene to be 7: 3, adding a ferrous sulfate solution with the mass percentage concentration of 1% within 2 hours at a constant speed, and adding the ferrous sulfate solution in an amount of volume ratio: ferrous sulfate to ammonium persulfate ratio of 3 to 20; the method comprises the steps of pressurizing mixed gas in a gas mixing tank and then filling the pressurized mixed gas into a polymerization reaction kettle in the process of adding ferrous sulfate, and supplementing and adding subsequent monomers in the form of mixed gas to keep the polymerization reaction kettle at a constant pressure; finishing the reaction after 20 minutes after the ferrous sulfate solution is added, discharging the residual gas out of the reaction kettle by using a vacuum pump, opening the kettle and collecting the material;
repeatedly washing the obtained materials with deionized water for more than three times, and removing the residual initiator until the measured conductivity of the filtrate is reduced to below 1 mu S/m; and finally, drying at the temperature of not higher than 150 ℃ to obtain the ETFE copolymer resin in a solid powder state.
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| CN201210211170.5A CN102718907B (en) | 2012-06-26 | 2012-06-26 | Preparation method of ethylene-tetrafluoroethylene copolymer resin |
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| CN102718907B true CN102718907B (en) | 2014-08-06 |
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| CN115894765A (en) * | 2022-06-08 | 2023-04-04 | 泰兴梅兰新材料有限公司 | Preparation method of high-melt-flow-stability fluorinated ethylene propylene resin |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4277586A (en) * | 1974-11-20 | 1981-07-07 | Asahi Glass Company, Ltd. | Process for preparing a propylene-tetrafluoroethylene copolymer |
| CN101033277A (en) * | 2007-03-27 | 2007-09-12 | 上海三爱富新材料股份有限公司 | Tetrafluoroethylene-propylene fluorine-containing elastic body and preparing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1317833B1 (en) * | 2000-02-15 | 2003-07-15 | Ausimont Spa | THERMO-PROCESSABLE FLUORINATED POLYMERS. |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4277586A (en) * | 1974-11-20 | 1981-07-07 | Asahi Glass Company, Ltd. | Process for preparing a propylene-tetrafluoroethylene copolymer |
| CN101033277A (en) * | 2007-03-27 | 2007-09-12 | 上海三爱富新材料股份有限公司 | Tetrafluoroethylene-propylene fluorine-containing elastic body and preparing method thereof |
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Effective date of registration: 20191225 Address after: No.3 Zhabei Road, Taixing Economic Development Zone, Taizhou City, Jiangsu Province Patentee after: Taixing Meilan New Material Co., Ltd Address before: 225300 No. 460, Yangzhou Road, Taizhou, Jiangsu Patentee before: Jiangsu Meilan Chemical Co., Ltd. |