CN116836341A - Preparation method of polybenzimidazole-polypropylene copolymer - Google Patents
Preparation method of polybenzimidazole-polypropylene copolymer Download PDFInfo
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- CN116836341A CN116836341A CN202310832065.1A CN202310832065A CN116836341A CN 116836341 A CN116836341 A CN 116836341A CN 202310832065 A CN202310832065 A CN 202310832065A CN 116836341 A CN116836341 A CN 116836341A
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- 229920005606 polypropylene copolymer Polymers 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 229920000642 polymer Polymers 0.000 claims abstract description 56
- 239000002904 solvent Substances 0.000 claims abstract description 31
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 239000000178 monomer Substances 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 21
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 21
- 239000006184 cosolvent Substances 0.000 claims abstract description 17
- 239000011259 mixed solution Substances 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 239000002244 precipitate Substances 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 239000011261 inert gas Substances 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 26
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 18
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 18
- 239000003999 initiator Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 16
- 239000000706 filtrate Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 10
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 8
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 8
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 239000003230 hygroscopic agent Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000001376 precipitating effect Effects 0.000 claims description 4
- 239000006228 supernatant Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 238000010981 drying operation Methods 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- 239000000047 product Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 9
- 238000006116 polymerization reaction Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- -1 aromatic ring compound Chemical class 0.000 abstract description 5
- 239000003054 catalyst Substances 0.000 abstract description 5
- 238000001291 vacuum drying Methods 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 8
- 239000012535 impurity Substances 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000000376 reactant Substances 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000710 polymer precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/06—Treatment of polymer solutions
- C08F6/12—Separation of polymers from solutions
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/18—Polybenzimidazoles
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a preparation method of a polybenzimidazole-polypropylene copolymer, which comprises the steps of adding a cosolvent into a three-neck flask, adding benzimidazole and propylene monomers, heating and stirring under the protection of inert gas, adding the cosolvent, heating and stirring a solvent, adding the solvent, stirring and filtering, heating to obtain a polymer precipitate, and vacuum drying the polymer precipitate to obtain a mixed solution, namely the polybenzimidazole-polypropylene copolymer. The polybenzimidazole-polypropylene copolymer is prepared by benzimidazole and propylene monomers, has simple preparation process, low cost and easy mass production, and the benzimidazole serving as an aromatic ring compound has high stability and solubility, is an excellent catalyst, can effectively promote the polymerization reaction of the propylene monomers, and improves the reaction activity and the product yield.
Description
Technical Field
The invention relates to a preparation method of a polybenzimidazole-polypropylene copolymer, in particular to a preparation method of the polybenzimidazole-polypropylene copolymer.
Background
The polybenzimidazole-polypropylene copolymer is a material with high performance, high temperature resistance and chemical corrosion resistance, has higher temperature stability and chemical corrosion resistance, can be used for manufacturing high-temperature and high-strength parts, chemical containers and other products, and along with the development of industry, the market demand for the polybenzimidazole-polypropylene copolymer is more and more, and the preparation method of the polybenzimidazole-polypropylene copolymer is more and more.
The current process for preparing polybenzimidazole-polypropylene copolymers then has the following disadvantages: the process is complex, the cost is high, the prepared polybenzimidazole-polypropylene copolymer has low purity and poor quality, the composition, molecular weight and structure of the copolymer are difficult to control by the existing method for preparing the polybenzimidazole-polypropylene copolymer, and meanwhile, the grafting efficiency is low, so that the performance of the product is influenced; the existing method for preparing the polybenzimidazole-polypropylene copolymer does not carry out filtration treatment before polymer precipitation, and a large amount of insoluble impurities and unreacted substances are doped in the polymer solution, so that the quality of the prepared polybenzimidazole-polypropylene copolymer is seriously affected; the solvents used in the existing method for preparing the polybenzimidazole-polypropylene copolymer are expensive, so that the cost for preparing the polybenzimidazole-polypropylene copolymer by the preparation method is high.
Disclosure of Invention
The invention aims to solve the problems of complex process, high cost and low purity and poor quality of the polybenzimidazole-polypropylene copolymer prepared by the prior art, and provides a preparation method of the polybenzimidazole-polypropylene copolymer, which has the advantages of simple process, easy mass production, low price of a solvent and low preparation cost.
The aim of the invention can be achieved by the following technical scheme: a method for preparing a polybenzimidazole-polypropylene copolymer, which comprises the following steps:
step one: adding a cosolvent into a three-neck flask, wherein the cosolvent is anhydrous and oxygen-free so as to avoid affecting the activity of an initiator added in the subsequent step, adding benzimidazole and propylene monomers, wherein the reaction between the benzimidazole and the propylene monomers requires a certain temperature and time, using the cosolvent can uniformly mix a reaction system, reducing the local concentration difference of the reaction, improving the reaction effect, improving the product quality, regulating the reaction rate, reducing the activity of the reaction to a certain extent, avoiding excessively severe reaction, ensuring the safety of the reaction, adding benzimidazole and propylene monomers, and adding benzimidazole serving as an aromatic ring compound, has high stability and solubility, is an excellent catalyst, can effectively promote the polymerization reaction of the propylene monomers, improves the reaction activity and the product yield, avoids the interference of oxygen or moisture on the reaction under the protection of inert gas, and is heated to 70-80 ℃ for 3-4 hours to obtain a mixed solution;
step two: the initiator is added into the mixed solution prepared in the first step, the initiator should be added in time to avoid the decomposition or aging of reactants caused by overlong storage time of the mixture at room temperature, the quality of the copolymer is affected, the initiator can guide the reaction between benzimidazole and propylene monomers, promote the reaction, shorten the reaction time, and accelerate the rate of polymerization reaction, the heating temperature is controlled to be 80-120 ℃, the stirring is continuously carried out in the heating process, and the polymer solution is obtained after the reaction is finished;
step three: adding a solvent into the polymer solution prepared in the second step, stirring for 5-9h, dissolving the polymer in the polymer solution into the solvent, filtering by using a filter to obtain filtrate, adding the solvent to enable the polymers dispersed in the polymer solution to be more uniformly mixed together, and filtering to remove insoluble impurities and unreacted substances and purify the polymer solution, thereby improving the quality of the prepared polybenzimidazole-polypropylene copolymer;
step four: heating the filtrate in the third step to 155-160 ℃, continuously stirring in the heating process to volatilize organic matters in the filtrate, precipitating polymers in the filtrate, pouring out supernatant fluid, and collecting the polymer precipitate;
step five: and (3) placing the polymer precipitate in the step (IV) in a drying chamber, controlling the drying temperature to be 60-90 ℃, and drying in a vacuum environment until the polymer precipitate is completely anhydrous, thus obtaining the polybenzimidazole-polypropylene copolymer.
The invention further technically improves that: in the first step, the cosolvent is one of dimethylformamide or dimethyl sulfoxide, nitrogen is selected as inert gas, toluene is added into the three-neck flask after the first operation and before the second operation, and the mixture is boiled and refluxed for 4-24 hours, so that the toluene is distilled out.
The invention further technically improves that: in the first step, the mol ratio of benzimidazole to propylene monomer is controlled to be 1:1-1.8, and the volume ratio of benzimidazole to cosolvent is controlled to be 1:0.6-0.8.
The invention further technically improves that: in the second step, the molar ratio of the initiator to the benzimidazole added in the first step is controlled to be 1:1.2-1.6, and the initiator is one of benzoyl peroxide or dibenzoyl peroxide.
The invention further technically improves that: the volume ratio of the solvent in the third step to the polymer solution in the second step is controlled to be 1:8-15, and the solvent is one of chloroform, methanol, toluene and dimethylformamide.
The invention further technically improves that: and step five, before the drying operation, placing a hygroscopic agent in a drying chamber, wherein the hygroscopic agent is selected from one of silica gel or alumina.
The invention further technically improves that: after the first operation and before the second operation, extracting agent is added into the mixed solution to extract, the cosolvent is separated from the polymer, and unreacted monomers and impurities in the reaction can be effectively removed by extracting and removing the cosolvent, so that the purity and quality of the product are improved.
The invention further technically improves that: the extraction agent is the absolute ethyl alcohol, the absolute ethyl alcohol is a common and economic solvent, compared with other solvents, the absolute ethyl alcohol is used as the extraction solvent, the production cost can be reduced, meanwhile, the operability of the extraction operation by using the absolute ethyl alcohol is very high, the operation is simple and easy to master, and the volume ratio of the absolute ethyl alcohol to the mixed solution is 1:2-10.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention prepares the polybenzimidazole-polypropylene copolymer by using benzimidazole and propylene monomers, has simple preparation process, low cost and easy mass production, and the benzimidazole is used as an aromatic ring compound, has high stability and solubility, is an excellent catalyst, can effectively promote the polymerization reaction of the propylene monomers, and improves the reaction activity and the product yield.
(2) According to the invention, the solvent is added, so that the polymers dispersed in the polymer solution can be more uniformly mixed together, and meanwhile, insoluble impurities and unreacted substances can be removed by filtering, so that the polymer solution is purified, and the quality of the prepared polybenzimidazole-polypropylene copolymer is improved.
(3) According to the invention, the extracting agent is added into the mixed solution for extraction, the cosolvent is separated from the polymer, and unreacted monomers and impurities in the reaction can be effectively removed by extracting and removing the cosolvent, so that the purity and quality of the product are improved, the extracting agent is anhydrous ethanol which is a common and economic solvent, compared with other solvents, the production cost can be reduced by using the anhydrous ethanol as the extracting solvent, and meanwhile, the operability of the extraction operation by using the anhydrous ethanol is very high, and the operation is simple and easy to grasp.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A method for preparing a polybenzimidazole-polypropylene copolymer, which comprises the following steps:
step one: in addition, the dimethylformamide is an inexpensive and easily available cosolvent, the cost of preparing the polybenzimidazole-polypropylene copolymer can be reduced, benzimidazole and propylene monomers are added, the molar ratio of the benzimidazole to the propylene monomers is controlled at 1:1.5, the volume ratio of the benzimidazole to the dimethylformamide is controlled at 1:0.7, the benzimidazole is used as an aromatic ring compound, has high stability and solubility, is an excellent catalyst, can effectively promote the polymerization reaction of the propylene monomers, improves the reaction activity and the product yield, avoids the interference of oxygen or moisture on the reaction by introducing nitrogen under the protection of nitrogen gas, heats up to 75 ℃, stirs for 3.2 hours, and then the mixed solution is distilled and refluxed for 16 hours to obtain a mixed solution;
step two: the initiator is added into the mixed solution prepared in the first step, the initiator should be added in time, the problem that the mixture is stored for too long at room temperature to cause decomposition or aging of reactants, the quality of the copolymer is affected, the initiator can guide the reaction between benzimidazole and propylene monomers, promote the reaction, shorten the reaction time, and further accelerate the rate of polymerization, the initiator selects benzoyl peroxide, the molar ratio of the benzoyl peroxide to the benzimidazole added in the first step is controlled to be 1:1.4, the benzoyl peroxide has high initiator activity, the polymerization reaction can be initiated at a lower temperature, the interaction between the benzoyl peroxide and a product is small, the polymer is not greatly affected, the purification and performance adjustment of the polymer are facilitated, the heating temperature is controlled to be 90 ℃, the mixture is continuously stirred in the heating process, and the mixture is naturally cooled after the reaction is finished, so as to obtain a polymer solution;
step three: adding a solvent into the polymer solution prepared in the second step, wherein the solvent is chloroform, the volume ratio of the chloroform to the polymer solution in the second step is controlled to be 1:10, stirring is carried out for 7 hours, so that the polymer in the polymer solution is dissolved into the solvent, filtering is carried out by using a filter to obtain filtrate, the polymers dispersed in the polymer solution can be more uniformly mixed together by adding the solvent, and simultaneously, insoluble impurities and unreacted substances can be removed by filtering, and the polymer solution is purified, so that the quality of the prepared polybenzimidazole-polypropylene copolymer is improved;
step four: heating the filtrate in the third step to 155 ℃, continuously stirring in the heating process to volatilize organic matters in the filtrate, precipitating polymers in the filtrate, pouring out supernatant fluid, and collecting the polymer precipitate;
step five: and (3) placing the polymer precipitate in the step (IV) in a drying chamber, placing aluminum oxide as a moisture absorbent in the drying chamber, controlling the drying temperature at 70 ℃, and drying in a vacuum environment until the polymer precipitate is completely anhydrous, thus obtaining the polybenzimidazole-polypropylene copolymer.
Example two
A method for preparing a polybenzimidazole-polypropylene copolymer, which comprises the following steps:
step one: adding a cosolvent into a three-neck flask, selecting dimethyl sulfoxide, adding benzimidazole and propylene monomers, controlling the molar ratio of the benzimidazole to the propylene monomers to be 1:1.6, controlling the volume ratio of the benzimidazole to the dimethyl sulfoxide to be 1:0.75, wherein the benzimidazole is used as an aromatic ring compound, has high stability and solubility, is an excellent catalyst, can effectively promote the polymerization reaction of the propylene monomers, improves the reaction activity and the product yield, avoids the interference of oxygen or moisture on the reaction by introducing nitrogen under the protection of nitrogen gas, heats for 78 ℃ for 3.5 hours to obtain a mixed solution, adding absolute ethyl alcohol into the three-neck flask for extraction, and the extractant adopts the absolute ethyl alcohol which is a common and economic solvent compared with other solvents, and can reduce the production cost by using the absolute ethyl alcohol as an extraction solvent;
step two: the initiator is added into the mixed solution prepared in the first step, the initiator should be added in time, the problem that the mixture is stored for too long at room temperature to decompose or age reactants, the quality of the copolymer is affected, the initiator can guide the reaction between benzimidazole and propylene monomers, promote the reaction, shorten the reaction time, and accelerate the rate of polymerization, the initiator selects dibenzoyl peroxide, the mole ratio of the dibenzoyl peroxide to benzimidazole added in the first step is controlled at 1:1.5, the heating temperature is controlled at 85 ℃, the mixture is continuously stirred in the heating process, and the polymer solution is obtained after the reaction is finished;
step three: adding a solvent into the polymer solution prepared in the second step, wherein the solvent is methanol, the volume ratio of the methanol to the polymer solution in the second step is controlled at 1:12, stirring is carried out for 8 hours, so that the polymer in the polymer solution is dissolved into the solvent, filtering is carried out by using a filter to obtain filtrate, the polymers dispersed in the polymer solution can be more uniformly mixed together by adding the solvent, and simultaneously, insoluble impurities and unreacted substances can be removed by filtering, and the polymer solution is purified, so that the quality of the prepared polybenzimidazole-polypropylene copolymer is improved;
step four: heating the filtrate in the third step to 160 ℃, continuously stirring in the heating process to volatilize organic matters in the filtrate, precipitating polymers in the filtrate, pouring out supernatant fluid, and collecting the polymer precipitate;
step five: and (3) placing the polymer precipitate in the step (IV) in a drying chamber, placing aluminum oxide as a moisture absorbent in the drying chamber, controlling the drying temperature to be 80 ℃, and drying in a vacuum environment until the polymer precipitate is completely anhydrous, thus obtaining the polybenzimidazole-polypropylene copolymer.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (8)
1. A preparation method of a polybenzimidazole-polypropylene copolymer is characterized by comprising the following steps: the preparation method comprises the following steps:
step one: adding a cosolvent into the three-neck flask, adding benzimidazole and propylene monomers, heating to 70-80 ℃ under the protection of inert gas, and stirring for 3-4 hours to obtain a mixed solution;
step two: adding an initiator into the mixed solution prepared in the step one, heating for 8-16h, controlling the heating temperature to be 80-120 ℃, continuously stirring in the heating process, and naturally cooling after the reaction is finished to obtain a polymer solution;
step three: adding a solvent into the polymer solution prepared in the second step, stirring for 5-9h, dissolving the polymer in the polymer solution into the solvent, and filtering by using a filter to obtain filtrate;
step four: heating the filtrate in the third step to 155-160 ℃, continuously stirring in the heating process to volatilize organic matters in the filtrate, precipitating polymers in the filtrate, pouring out supernatant fluid, and collecting the polymer precipitate;
step five: and (3) placing the polymer precipitate in the step (IV) in a drying chamber, controlling the drying temperature to be 60-90 ℃, and drying in a vacuum environment until the polymer precipitate is completely anhydrous, thus obtaining the polybenzimidazole-polypropylene copolymer.
2. A process for the preparation of a polybenzimidazole-polypropylene copolymer according to claim 1 where: in the first step, the cosolvent is one of dimethylformamide or dimethyl sulfoxide, nitrogen is selected as inert gas, toluene is added into the three-neck flask after the first operation and before the second operation, and the mixture is boiled and refluxed for 4-24 hours, so that the toluene is distilled out.
3. A process for the preparation of a polybenzimidazole-polypropylene copolymer according to claim 1 where: in the first step, the mol ratio of benzimidazole to propylene monomer is controlled to be 1:1-1.8, and the volume ratio of benzimidazole to cosolvent is controlled to be 1:0.6-0.8.
4. A process for the preparation of a polybenzimidazole-polypropylene copolymer according to claim 1 where: in the second step, the molar ratio of the initiator to the benzimidazole added in the first step is controlled to be 1:1.2-1.6, and the initiator is one of benzoyl peroxide or dibenzoyl peroxide.
5. A process for the preparation of a polybenzimidazole-polypropylene copolymer according to claim 1 where: the volume ratio of the solvent in the third step to the polymer solution in the second step is controlled to be 1:8-15, and the solvent is one of chloroform, methanol, toluene and dimethylformamide.
6. A process for the preparation of a polybenzimidazole-polypropylene copolymer according to claim 1 where: and step five, before the drying operation, placing a hygroscopic agent in a drying chamber, wherein the hygroscopic agent is selected from one of silica gel or alumina.
7. A process for the preparation of a polybenzimidazole-polypropylene copolymer according to claim 1 where: after the first operation and before the second operation, extracting agent is added into the mixed solution for extraction, and the cosolvent is separated from the polymer.
8. A process for the preparation of a polybenzimidazole-polypropylene copolymer according to claim 7 where: the extractant is absolute ethyl alcohol, and the volume ratio of the absolute ethyl alcohol to the mixed solution is 1:2-10.
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