CN109535405A - The preparation method of polyarylate of the one kind based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles - Google Patents
The preparation method of polyarylate of the one kind based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles Download PDFInfo
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- CN109535405A CN109535405A CN201710852987.3A CN201710852987A CN109535405A CN 109535405 A CN109535405 A CN 109535405A CN 201710852987 A CN201710852987 A CN 201710852987A CN 109535405 A CN109535405 A CN 109535405A
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- 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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/68—Polyesters containing atoms other than carbon, hydrogen and oxygen
- C08G63/685—Polyesters containing atoms other than carbon, hydrogen and oxygen containing nitrogen
- C08G63/6852—Polyesters containing atoms other than carbon, hydrogen and oxygen containing nitrogen derived from hydroxy carboxylic acids
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- 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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
- C08G63/80—Solid-state polycondensation
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/38—Polymers
- C09K19/3804—Polymers with mesogenic groups in the main chain
- C09K19/3809—Polyesters; Polyester derivatives, e.g. polyamides
Abstract
The preparation method of polyarylate of the one kind based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles, the present invention relates to a kind of preparation methods of polyarylate based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles, it is in order to which the preparation difficulty for solving the problems, such as liquid crystal polyarylate is big, tensile strength is lower.Preparation method: one, by P-hydroxybenzoic acid and 2- (4- carboxyl phenyl) -5- pyridone and imidazoles, acetic anhydride and 4- ethylamino pyridine and antioxidant are added to the prepolymer for preparing Thermotropic Liquid Crystalline Copolyesters in polymeric kettle by melt polycondensation；Two, prepolymer is placed under the conditions of nitrogen protection carries out solid state polycondensation in rotary kiln, obtains heavy polymer powder；Three, heavy polymer powder is cooling after being kneaded, and drawing-off prepares nascent polyarylate；Four, nascent polyarylate is heat-treated.The preparation method of Thermotropic Liquid Crystalline Copolyesters fiber of the present invention is easy to operate, and the drawing of finally obtained polyarylate fiber stretches intensity up to 165~205MPa.
Description
Technical field
The present invention relates to a kind of preparation methods of polyarylate based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles.
Background technique
Thermotropic Liquid Crystalline Copolyesters (TLCP) are the special engineering plastics that aromatic ring and ester bond are had on molecular backbone.Its point
Subchain regularity is very high, and during melt-processed, polyarylate strand is in liquid crystal phase always, under external force easily
Regular arrangement forms multilayer oriented structure.
Polyarylate has excellent creep resistant, impact resistance, strain recovery, wearability and higher machinery strong
Degree and rigidity.Polyarylate shows higher tensile strength within the scope of very wide temperature.In addition, it also has excellent resistance to purple
Outside line shielding, impact resistance, surface hardness and creep resistance.
Domestic patent 200410054025.6 reports a kind of solid-state preparation method of liquid crystal copolyester, specifically will melting
Performed polymer after polymerization carries out tens of hours solid-state polymerizations to prepare the liquid crystal polyester of high molecular weight.But this method is clearly present
Production cycle too long problem, be not suitable for industrialization large-scale continuous production.United States Patent (USP) 4,169,933 describes one kind and contains
There is the polymer system for the repetitive unit being transformed from quinhydrones, P-hydroxybenzoic acid, 2,6 naphthalene dicarboxylic acid and 4-HBA
Preparation Method.United States Patent (USP) 5,079,289,5,097,001 and 5,221,730 describe containing from quinhydrones, P-hydroxybenzoic acid,
The method for producing polymer for the repetitive unit that terephthalic acid (TPA) and 4-HBA are transformed.United States Patent (USP) 5,492,946
It is related to LCP, United States Patent (USP) 4,851,497 is related to aromatic polyester.
Summary of the invention
The problem that the purpose of the present invention is to solve the preparation difficulty of liquid crystal polyarylate is big, tensile strength is lower, and mention
For a kind of preparation method of polyarylate based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles.
The preparation method of Thermotropic Liquid Crystalline Copolyesters of the present invention follows these steps to realize:
It one, is (0.5~4.0): 1 P-hydroxybenzoic acid and 2- (4- carboxyl phenyl) -5- hydroxyl by polymerized monomer molar ratio
Yl pyridines and imidazoles, acetic anhydride and 4- ethylamino pyridine and stannous chloride are added in Hastelloy polymeric kettle, 115~
4~8h is kept between 160 DEG C, then heats to 310 DEG C, nitrogen is filled with into Hastelloy polymeric kettle after keeping the temperature 3h, through Kazakhstan
The discharge of alloy polymeric kettle crushes, obtains prepolymer after drying；
Two, under the conditions of the prepolymer for obtaining step 1 is placed in nitrogen protection, with 200~215 DEG C in being carried out in rotary kiln
Solid state polycondensation obtains heavy polymer powder；
Three, the heavy polymer powder for obtaining step 2 mixes at 320~350 DEG C by single screw extrusion machine
Refining, again through metering pump and component after exhaust, after ring wind quenching, drawing-off obtains nascent polyarylate after pelletizing；
Four, under the conditions of nitrogen protection, nascent polyarylate is heat-treated, Thermotropic Liquid Crystalline Copolyesters are obtained.
The preparation method of Thermotropic Liquid Crystalline Copolyesters of the present invention is easy to operate, and reaction condition is easily controllable, step 2 preparation
The weight average molecular weight of polymer powder is 3.5 × 104~9.0 × 104, molecular weight height.Preparation process can be in polymeric kettle and single spiral shell
Implement in bar extruder, be convenient for continuous production, tensile strength can reach 90~130MPa, using final after heat treatment
The drawing of obtained Thermotropic Liquid Crystalline Copolyesters stretches intensity up to 170~200MPa.Solves previous Thermotropic Liquid Crystalline Copolyesters preparation work
Skill is complicated, and condition is not easy to control, unstable quality, the lower disadvantage of finished product mechanical property.
Specific embodiment
Specific embodiment 1: the preparation method of present embodiment Thermotropic Liquid Crystalline Copolyesters follows these steps to implement:
It one, is (0.5~4.0): 1 P-hydroxybenzoic acid and 2- (4- carboxyl phenyl) -5- hydroxyl by polymerized monomer molar ratio
Yl pyridines and imidazoles, acetic anhydride and 4- ethylamino pyridine and stannous chloride are added in Hastelloy polymeric kettle, 115~
4~8h is kept between 160 DEG C, then heats to 310 DEG C, nitrogen is filled with into Hastelloy polymeric kettle after keeping the temperature 3h, through Kazakhstan
The discharge of alloy polymeric kettle crushes, obtains prepolymer after drying；
Two, under the conditions of the prepolymer for obtaining step 1 is placed in nitrogen protection, with 200~215 DEG C in being carried out in rotary kiln
Solid state polycondensation obtains heavy polymer powder；
Three, the heavy polymer powder for obtaining step 2 mixes at 320~350 DEG C by single screw extrusion machine
Refining, again through metering pump and component after exhaust, after ring wind quenching, drawing-off, pelletizing obtains nascent polyarylate；
Four, under the conditions of nitrogen protection, nascent polyarylate is heat-treated, Thermotropic Liquid Crystalline Copolyesters are obtained.
The inherent viscosity for the prepolymer that present embodiment step 1 obtains is 0.5~3.2dl/g, [is molten with Pentafluorophenol
Agent is made into the solution of 0.1mol/l, with determination of ubbelohde viscometer], the characteristic for the heavy polymer powder that step 2 obtains
For viscosity in 5.0~10.0dl/g, weight average molecular weight is 3.5 × 104~9.0 × 104。
The preparation method of thermotropic liquid crystal high-performance polyarylate described in present embodiment can be squeezed by polymeric kettle and single screw rod
Machine out, draw roll, the combination of pelleter realize that the shear force for having made full use of single screw extrusion machine to have is big, object
The advantages that material contact is abundant can also be obviously shortened the production cycle while Thermotropic Liquid Crystalline Copolyesters of high molecular weight are made,
And the shortcomings that overcoming unstable product quality provides one simply for industrial large-scale continuous production liquid crystal polyarylate
Easy new method.
Specific embodiment 2: the present embodiment is different from the first embodiment in that P-hydroxybenzoic acid in step 1
It is greater than 99.5% with the purity of 2- (4- carboxyl phenyl) -5- pyridone and imidazoles.Other steps and parameter and specific embodiment party
Formula one is identical.
Specific embodiment 3: the present embodiment is different from the first and the second embodiment in that acetic anhydride in step 1
Mole is total hydroxyl moles in polymerized monomer P-hydroxybenzoic acid and 2- (4- carboxyl phenyl) -5- pyridone and imidazoles
2~2.5 times.Other steps and parameter are the same as one or two specific embodiments.
Specific embodiment 4: 4- second in step 1 unlike one of present embodiment and specific embodiment one to three
The molal quantity of aminopyridine is polymerized monomer P-hydroxybenzoic acid and 2- (4- carboxyl phenyl) -5- pyridone and imidazoles total moles
Several 0.02~0.03 times.Other steps and parameter are identical as one of specific embodiment one to three.
Existing melt polycondensation reaction catalyst is zinc acetate, manganese acetate, sodium acetate, potassium acetate, cobalt acetate, lithium acetate, titanium
One or more of acid esters, dibutyl tin laurate, dibutyltin oxide, antimony oxide or antimony glycol, conversion ratio compared with
It is low, the polymer of high molecular weight cannot be formed, therefore high performance Thermotropic Liquid Crystalline Copolyesters can not be prepared.And the present invention is made
Catalyst is not belonging to any one of above-mentioned catalyst, improves the conversion ratio of polycondensation reaction.
Specific embodiment 5: step 1 unlike one of present embodiment and specific embodiment one to four then with
The speed of 0.5 DEG C/min is warming up to 310 DEG C, is filled with nitrogen into Hastelloy polymeric kettle after keeping the temperature 3h.Other steps and parameter
It is identical as one of specific embodiment one to four.
Specific embodiment 6: step is once Kazakhstan unlike one of present embodiment and specific embodiment one to five
Alloy polymeric kettle diameter be 3mm 10 hole dispensing valves be discharged, crush, 150 DEG C be dried to obtain prepolymer.Other steps and parameter
It is identical as one of specific embodiment one to five.
Specific embodiment 7: step 3 drawing-off unlike one of present embodiment and specific embodiment one to six
Speed is 10~50m/min.Other steps and parameter are identical as one of specific embodiment one to six.
Specific embodiment 8: step 4 is unlike one of present embodiment and specific embodiment one to seven with 260
~280 DEG C of temperature carries out heat treatment 60h to nascent polyarylate.Other steps and one of parameter and specific embodiment one to seven
It is identical.
Specific embodiment 9: preheating rank described unlike one of present embodiment and specific embodiment one to eight
The antioxidant that section is added is stannous chloride.Other steps and parameter are identical as one of specific embodiment one to eight.
Common antioxidant in existing polyester are as follows: antioxidant 1010, antioxidant 1024, resists antioxidant 1076
The combination of one or more of oxidant 618, antioxidant 626, antioxidant 1024, antioxidant 1098, it is common anti-
Oxidant cannot play expected ideal effect in the present invention and polymer color can be made to deepen, and then can using stannous chloride
Make resulting polymer color close to white.
Embodiment:
100g ammonia spirit is added in 250ml there-necked flask, is cooled to 0 DEG C, 4- ethyl chloropyridine 17.8g is then added,
Temperature rising reflux 1 hour, after cooling, 50g toluene is added, extracts 2 times, combining extraction liquid, anhydrous magnesium sulfate 10g drying is added for 24 hours,
Filtering, revolving, obtains crude product, adds in 50g dimethylbenzene, recrystallizes, obtains nearly colorless plate crystal 4- ethylamino pyridine 9g, standby
With.
Polyphosphoric acids 100g is added in the there-necked flask of 250ml, is evacuated to 20mmHg hereinafter, being heated to 100 DEG C of heat preservations
3h is down to room temperature, and 12g 5- hydroxyl -2,3- diamino-pyridine and 15g terephthalic acid (TPA) is added, and is warming up to 90 DEG C, and five oxygen are added
Change two phosphorus 43g, be warming up to 150 DEG C with the speed of 0.5 DEG C/min and be down to room temperature, add in 1l water, filter, gained crude product adds to
In 15% NaOH solution, flow back 2h, with 10% HCL aqueous solution tune pH=3, filtering, the methanol of products obtained therefrom 50g DMF
Solution (DMF: methanol=9:1) recrystallization obtains sterling 2- (4- carboxyl phenyl) -5- pyridone simultaneously imidazoles 10g, spare.
Embodiment one: the preparation method of the present embodiment Thermotropic Liquid Crystalline Copolyesters follows these steps to realize:
One, by 69g P-hydroxybenzoic acid and 254g 2- (4- carboxyl phenyl) -5- pyridone and imidazoles, 310g acetic anhydride
It is added in 2l Hastelloy polymeric kettle with 4.5g 4- ethylamino pyridine and 0.4g stannous chloride, in 120 DEG C of holding 5h, so
310 DEG C are warming up to the speed of 0.5 DEG C/min afterwards, is filled with 0.2MPa nitrogen into Hastelloy polymeric kettle after keeping the temperature 3h, is passed through
It after the 10 hole dispensing valves of diameter 3mm are released, crushes, 20 meshes is crossed, to obtain prepolymer after 150 DEG C of dry 3h；
Two, it is 0.3m that the prepolymer for obtaining step 1, which is placed in nitrogen flow,3Under/h protective condition, with 200 DEG C in rotation
Solid state polycondensation 48h is carried out in kiln, obtains heavy polymer powder；
Three, the heavy polymer powder that step 2 obtains is kneaded at 320 DEG C by single screw extrusion machine, is vented
Afterwards again through metering pump and component, after 25 DEG C of quenchings, pelletizing obtains nascent polyarylate；
It four, is 0.3m in nitrogen flow3Under conditions of/h, nascent polyarylate is heat-treated with 280 DEG C of temperature
60h obtains Thermotropic Liquid Crystalline Copolyesters.
The inherent viscosity of the prepolymer of the present embodiment step 1 preparation is 1.0dl/g, the high-molecular-weight poly of step 2 preparation
The inherent viscosity for closing object powder is 5.0dl/g, weight average molecular weight 45000.The stretching for the nascent polyarylate that step 3 obtains is strong
Degree is 85MPa, and the drawing for the Thermotropic Liquid Crystalline Copolyesters that step 4 obtains stretches intensity up to 165MPa.
Embodiment two: the preparation method of the present embodiment Thermotropic Liquid Crystalline Copolyesters follows these steps to realize:
One, by 138g P-hydroxybenzoic acid and 254g 2- (4- carboxyl phenyl) -5- pyridone and imidazoles, 410g acetic acid
Acid anhydride and 4.5g 4- ethylamino pyridine and 0.5g stannous chloride are added in 2l Hastelloy polymeric kettle, in 120 DEG C of holding 5h,
Then 310 DEG C are warming up to the speed of 0.5 DEG C/min, are filled with 0.2MPa nitrogen into Hastelloy polymeric kettle after keeping the temperature 3h, passed through
After crossing the 10 hole dispensing valves releasing of diameter 3mm, crushes, 20 meshes are crossed, to obtain prepolymer after 150 DEG C of dry 3h；
Two, it is 0.3m that the prepolymer for obtaining step 1, which is placed in nitrogen flow,3Under/h condition, with 200 DEG C in rotary kiln
Solid state polycondensation 48h is carried out, heavy polymer powder is obtained；
Three, the heavy polymer powder that step 2 obtains is kneaded at 320 DEG C by single screw extrusion machine, is vented
Afterwards again through metering pump and component, after 25 DEG C of quenchings, pelletizing obtains nascent polyarylate；
It four, is 0.3m in nitrogen flow3Under conditions of/h, nascent polyarylate is heat-treated with 280 DEG C of temperature
60h obtains Thermotropic Liquid Crystalline Copolyesters.
The inherent viscosity of the prepolymer of the present embodiment step 1 preparation is 2.0dl/g, the high-molecular-weight poly of step 2 preparation
The inherent viscosity for closing object powder is 6.6dl/g, weight average molecular weight 46400.The stretching for the nascent polyarylate that step 3 obtains is strong
Degree is 107MPa, and the drawing for the Thermotropic Liquid Crystalline Copolyesters that step 4 obtains stretches intensity up to 183MPa.
Embodiment three: the preparation method of the present embodiment Thermotropic Liquid Crystalline Copolyesters follows these steps to realize:
One, by 276g P-hydroxybenzoic acid and 254g 2- (4- carboxyl phenyl) -5- pyridone and imidazoles, 612g acetic acid
Acid anhydride and 6.9g 4- ethylamino pyridine and 0.9g stannous chloride are added in 2l Hastelloy polymeric kettle, in 120 DEG C of holding 5h,
Then 310 DEG C are warming up to the speed of 0.5 DEG C/min, are filled with 0.2MPa nitrogen into Hastelloy polymeric kettle after keeping the temperature 3h, passed through
After crossing the 10 hole dispensing valves releasing of diameter 3mm, crushes, 20 meshes are crossed, to obtain prepolymer after 150 DEG C of dry 3h；
Two, it is 0.3m that the prepolymer for obtaining step 1, which is placed in nitrogen flow,3Under/h condition, with 200 DEG C in rotary kiln
Solid state polycondensation 48h is carried out, heavy polymer powder is obtained；
Three, the heavy polymer powder that step 2 obtains is kneaded at 320 DEG C by single screw extrusion machine, is vented
Afterwards again through metering pump and component, after 25 DEG C of quenchings, pelletizing obtains nascent polyarylate；
It four, is 0.3m in nitrogen flow3Under conditions of/h, nascent polyarylate is heat-treated with 280 DEG C of temperature
60h obtains Thermotropic Liquid Crystalline Copolyesters.
The inherent viscosity of the prepolymer of the present embodiment step 1 preparation is 2.5dl/g, the high-molecular-weight poly of step 2 preparation
The inherent viscosity for closing object powder is 8.3dl/g, weight average molecular weight 55300.The stretching for the nascent polyarylate that step 3 obtains is strong
Degree is 118MPa, and the drawing for the Thermotropic Liquid Crystalline Copolyesters that step 4 obtains stretches intensity up to 200MPa.
Example IV: the preparation method of the present embodiment Thermotropic Liquid Crystalline Copolyesters follows these steps to realize:
One, by 413g P-hydroxybenzoic acid and 254g 2- (4- carboxyl phenyl) -5- pyridone and imidazoles, 820g acetic acid
Acid anhydride and 15g 4- ethylamino pyridine and 1.2g stannous chloride are added in 2l Hastelloy polymeric kettle, in 120 DEG C of holding 5h, so
310 DEG C are warming up to the speed of 0.5 DEG C/min afterwards, is filled with 0.2MPa nitrogen into Hastelloy polymeric kettle after keeping the temperature 3h, is passed through
It after the 10 hole dispensing valves of diameter 3mm are released, crushes, 20 meshes is crossed, to obtain prepolymer after 150 DEG C of dry 3h；
Two, it is 0.3m that the prepolymer for obtaining step 1, which is placed in nitrogen flow,3Under/h condition, with 200 DEG C in rotary kiln
Solid state polycondensation 48h is carried out, heavy polymer powder is obtained；
Three, the heavy polymer powder that step 2 obtains is kneaded at 320 DEG C by single screw extrusion machine, is vented
Afterwards again through metering pump and component, after 25 DEG C of quenchings, pelletizing obtains nascent polyarylate；
It four, is 0.3m in nitrogen flow3Under conditions of/h, nascent polyarylate is heat-treated with 280 DEG C of temperature
60h obtains Thermotropic Liquid Crystalline Copolyesters.
The inherent viscosity of the prepolymer of the present embodiment step 1 preparation is 2.9dl/g, the high-molecular-weight poly of step 2 preparation
The inherent viscosity for closing object powder is 9.3dl/g, weight average molecular weight 77800.The stretching for the nascent polyarylate that step 3 obtains is strong
Degree is 127MPa, and the drawing for the Thermotropic Liquid Crystalline Copolyesters that step 4 obtains stretches intensity up to 205MPa.
Claims (9)
1. the preparation method of polyarylate of the one kind based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles, it is characterised in that be
It follows these steps to realize:
It one, is (0.5~4.0): 1 P-hydroxybenzoic acid and 2- (4- carboxyl phenyl) -5- hydroxyl pyrrole by polymerized monomer molar ratio
Simultaneously imidazoles, acetic anhydride and 4- ethylamino pyridine and antioxidant are added in Hastelloy polymeric kettle for pyridine, at 115~160 DEG C
Between keep 4~8h, then heat to 310 DEG C, be filled with nitrogen into Hastelloy polymeric kettle after keeping the temperature 3h, it is poly- through Hastelloy
Kettle discharge is closed, crushes, obtain prepolymer after drying；
Two, under the conditions of the prepolymer for obtaining step 1 is placed in nitrogen protection, with 200~215 DEG C in carrying out solid phase in rotary kiln
Polycondensation reaction obtains heavy polymer powder；
Three, the heavy polymer powder that step 2 obtains is kneaded at 320~350 DEG C by single screw extrusion machine, is arranged
Again through metering pump and component after gas, after ring wind quenching, drawing-off, pelletizing obtains nascent polyarylate；
Four, under the conditions of nitrogen protection, nascent polyarylate is heat-treated, Thermotropic Liquid Crystalline Copolyesters are obtained.
2. a kind of system of polyarylate based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles according to claim 1
Preparation Method, it is characterised in that the purity of P-hydroxybenzoic acid and 2- (4- carboxyl phenyl) -5- pyridone and imidazoles in step 1
Greater than 99.5%.
3. a kind of system of polyarylate based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles according to claim 1
Preparation Method, it is characterised in that the mole of acetic anhydride is polymerized monomer P-hydroxybenzoic acid and 2- (4- carboxyl benzene in step 1
Base) 2~2.5 times of total hydroxyl moles in -5- pyridone and imidazoles.
4. a kind of system of polyarylate based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles according to claim 1
Preparation Method, it is characterised in that the molal quantity of 4- ethylamino pyridine is polymerized monomer P-hydroxybenzoic acid and 2- (4- carboxylic in step 1
Base phenyl) 0.02~0.03 times of -5- pyridone and imidazoles total mole number.
5. a kind of system of polyarylate based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles according to claim 1
Preparation Method, it is characterised in that then step 1 is warming up to 310 DEG C with the speed of 0.5 DEG C/min, gather after keeping the temperature 3h to Hastelloy
It closes in kettle and is filled with nitrogen.
6. a kind of system of polyarylate based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles according to claim 1
Preparation Method, it is characterised in that step is discharged once the 10 hole dispensing valves that Hastelloy polymeric kettle diameter is 3mm, crushes, 150
DEG C it is dried to obtain prepolymer.
7. a kind of system of polyarylate based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles according to claim 1
Preparation Method, it is characterised in that the speed of step 3 drawing-off is 10~50m/min.
8. a kind of system of polyarylate based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles according to claim 1
Preparation Method, it is characterised in that step 4 carries out heat treatment 60h to nascent polyarylate with 260~280 DEG C of temperature.
9. a kind of system of polyarylate based on 2- (4- carboxyl phenyl) -5- pyridone and imidazoles according to claim 1
Preparation Method, it is characterised in that antioxidant described in step 1 is stannous chloride.
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