CN113234211B - Continuous preparation method of PBAT polymer for low-cost biodegradable film for supermarket shopping bag - Google Patents
Continuous preparation method of PBAT polymer for low-cost biodegradable film for supermarket shopping bag Download PDFInfo
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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
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic 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
- C08G63/66—Polyesters containing oxygen in the form of ether groups
- C08G63/668—Polyesters containing oxygen in the form of ether groups derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/672—Dicarboxylic acids and dihydroxy compounds
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- 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
- C08G63/785—Preparation processes characterised by the apparatus used
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention discloses a continuous preparation method of a PBAT polymer for a low-cost biodegradable film for supermarket shopping bags, which comprises the following steps: pulping, first esterification, second esterification, preparation of powder slurry, pre-polycondensation reaction and final polycondensation reaction, wherein the pulping step comprises the following steps: mixing the components in a molar ratio of 1:1.31 mixture of terephthalic acid (PTA) and adipic acid and, in a molar ratio with respect to butanediol of 1:1.25 putting the mixture into a pulping kettle, adding a catalyst for pulping together, wherein the catalyst is tetrabutyl titanate or tetraisopropyl titanate, preferably tetraisopropyl titanate, and the addition amount of the catalyst is 0.03-0.05 percent of the mass of the PTA, preferably 0.04 percent of the mass of the PTA. The PBAT polymer for the low-cost biodegradable film for the supermarket shopping bag, prepared by the preparation method disclosed by the invention, has the advantages of complete biodegradation, direct film blowing, no need of filling and granulation, low cost, no adhesion of the film, high strength, good toughness, stable quality and capability of well meeting the low-cost use requirement of the supermarket shopping bag.
Description
Technical Field
The invention relates to the technical field of polymer preparation, in particular to a continuous preparation method of a PBAT polymer for a low-cost biodegradable film for supermarket shopping bags.
Background
PBAT is a novel biodegradable high polymer material, has high strength, good film blowing performance and easy biodegradation, is suitable for preparing supermarket shopping bags, is not required to be recycled, is biodegradable, has little influence on the environment, and avoids white pollution of common PE shopping bags to the environment.
The cost of PBAT is higher than that of PE, so that the PBAT is used as a supermarket shopping bag and is limited to a certain extent, and for this reason, many enterprises use pure PBAT and certain mineral powder to be mixed and granulated again to reduce the cost.
Disclosure of Invention
The invention aims to provide a continuous preparation method of a PBAT polymer for a low-cost biodegradable film for supermarket shopping bags, which has the advantages of complete biodegradation, direct film blowing, no need of filling and granulation, low cost, non-adhesion of the film, high strength, good toughness, stable quality, capability of well meeting the low-cost use requirement of the supermarket shopping bags, and capability of solving the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a continuous preparation method of a PBAT polymer for a low-cost biodegradable film for supermarket shopping bags comprises the following steps: pulping, first esterification, second esterification, preparation of powder slurry, pre-polycondensation reaction and final polycondensation reaction.
Preferably, the pulping step: mixing the components in a molar ratio of 1:1.31 mixture of terephthalic acid (PTA) and adipic acid and, in a molar ratio with respect to butanediol of 1:1.25 is put into a pulping kettle, and is added with a catalyst for pulping together, wherein the catalyst is tetrabutyl titanate or tetraisopropyl titanate, preferably tetraisopropyl titanate, and the addition amount is 0.03-0.05 percent of the mass of PTA, preferably 0.04 percent. After 30-50 minutes, preferably 35-40 minutes of beating, it is put into a slurry supply tank for internal circulation for standby, and the terephthalic acid (PTA) is characterized in that: appearance was white powder, purity: 99.9%, density: 1.51g/cm3, said adipic acid being characterized by: white powder in appearance, purity: 99.6 to 99.9%, said butanediol being characterized by: the appearance is colorless liquid, the purity is 99.6-99.9%, the boiling point is as follows: 225-228 ℃.
Preferably, the step of the first esterification: and pumping the slurry in the supply tank into a first esterification kettle for esterification, wherein the esterification temperature is controlled to be 165-185 ℃, preferably 170-185 ℃, and the flow rate is controlled to be 190-210Kg/h, preferably 200-210Kg/h, so that the liquid level is maintained at 1300-1500mm, and the esterification rate reaches 51-55%, preferably 52-54%.
Preferably, the step of the second esterification: pumping the esterified material obtained in the first step into a second esterification reaction production kettle by a pump for ester exchange, controlling the reaction temperature at 215-225 ℃, preferably 215-220 ℃, and the flow rate at 190-210Kg/h, preferably 200-210Kg/h, so that the liquid level is maintained at 1300-1500mm, and the esterification rate reaches 96-99%, preferably 98-99%.
Preferably, the step of preparing powder slurry comprises: the weight ratio of silicon dioxide to calcium carbonate is 1:20-30, preferably 1:25-30, and then mixing with tetrahydrofuran polyether and butanediol according to the weight ratio of 25:5:70, putting the mixture into a ball mill, grinding for 30-50 minutes, preferably 40-50 minutes, for standby, adding the powder slurry by a pipeline injector in a metering way, uniformly mixing the esterification product and the powder slurry which are injected into a melt pipeline by a metering pump by a pipeline homogenizer, wherein 30-50% of the PTA reactant is added as the functional mother liquor, and uniformly mixing the functional mother liquor and the functional mother liquor into a pre-polycondensation reactor by a homogenizer on the pipeline in order to control the flow rate to be 80-100Kg/h, preferably 80-90Kg/h, wherein the silicon dioxide is characterized in that: white powder in appearance, purity: 99.5-99.9%, 8000-10000 mesh, purity of calcium carbonate: 99.5-99.9%, particle size 50-80 nm, the polyether is characterized in that: purity: 99.5-99.9% and number average molecular weight 2500-3000.
Preferably, the step of the prepolycondensation reaction: the melt enters an up-flow type pre-polycondensation reaction kettle for pre-polycondensation reaction, the temperature of the melt is controlled to be 235-245 ℃, the time is 30-60 minutes, the liquid level is controlled to be 500mm, and the vacuum degree is controlled to be 800-1500Pa, preferably 800-1000Pa.
Preferably, the step of the final polycondensation reaction: the pre-condensation polymer enters a final condensation polymerization kettle, the temperature of the melt is controlled to be 250-260 ℃, and the time is 60-60 minutes; the liquid level is controlled at 400mm, the vacuum degree is controlled at 30-100Pa, preferably 50-80Pa, and after the intrinsic viscosity is 1.20-1.30 dL/g through an online detection point, the mixture is extruded, granulated, dried and packaged.
Preferably, the PBAT polymer for the low-cost biodegradable film for the supermarket shopping bag has the intrinsic viscosity of 1.20-1.30 dL/g, the tensile strength of 30-35MPa, the elongation at break of 400-500%, the hardness of 70-85A, the tear strength of 170KN/m, the friction coefficient of the film of 0.18-0.20 and the ash content of 10-20%.
Preferably, the PBAT polymer for the low-cost biodegradable film for the supermarket shopping bag can be prepared by the preparation method.
Compared with the prior art, the invention has the following beneficial effects: the PBAT polymer for the low-cost biodegradable film for the supermarket shopping bag prepared by the method can be completely biodegraded, can be directly blown and granulated without filling, has low cost, is not adhered to the film, has high strength and good toughness, has stable quality, and can well meet the low-cost use requirement of the supermarket shopping bag.
Drawings
FIG. 1 is a schematic process flow diagram of the continuous preparation method of PBAT polymer for low-cost biodegradable film according to the present invention;
FIG. 2 is an infrared spectrum of a PBAT polymer for a low-cost biodegradable film according to the present invention;
FIG. 3 is a TGA graph of a PBAT polymer for a low cost biodegradable film of the present invention;
FIG. 4 is a comparison table of the mechanical properties of PBAT polymers for the low-cost biodegradable film of the present invention.
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.
Referring to fig. 1 to 3, the present invention provides a technical solution: a continuous preparation method of PBAT polymer for a low-cost biodegradable film for supermarket shopping bags.
Example 1
On a small-sized flexible modified polyester continuous polyester polycondensation production device with the daily yield of 5-7 tons, the molar ratio of terephthalic acid to adipic acid is 1:1.31 and butanediol, in a molar ratio of 1:1.25, the catalyst is tetraisopropyl titanate. The addition amount thereof was 0.05% by mass of PTA. Beating for 40 minutes, and placing the mixture into a slurry supply tank for internal circulation for standby.
The obtained slurry is pumped into a first ester reaction kettle from a supply tank by a metering pump, the esterification reaction is carried out, the esterification temperature is controlled to be 170 ℃, the flow rate is controlled to be 200Kg/h, the liquid level is maintained to be 1300mm, and the esterification rate reaches 52 percent. The esterification product is pumped into a second esterification reaction kettle from the material to carry out esterification reaction, the temperature of the reactant is 215 ℃, the flow rate is controlled to be 200Kg/h, the liquid level is maintained at 1300mm, and the esterification rate reaches 99 percent. The ester is pumped into a pipeline by a material pump and enters a pre-polycondensation reaction kettle.
The preparation process of the powder slurry comprises the following steps: the weight ratio of silicon dioxide to calcium carbonate is 1:30, and then mixing the mixture with tetrahydrofuran homopolyether and butanediol according to the weight ratio of 25:5:70, putting the mixture into a ball mill, and grinding for 50 minutes for standby. The powder slurry is metered and added through a pipeline injector, the esterification product and the powder slurry which are pumped into a melt pipeline through a metering pump are uniformly mixed through a pipeline homogenizer, 40 percent of the mass of the PTA reactant of the addition amount of the functional mother liquor flows through the homogenizer on the pipeline for controlling the flow rate to be 80Kg/h, and the mixture is uniformly mixed and enters a pre-polycondensation reactor. The silica is characterized in that: white powder in appearance, purity: 99.5%, mesh number 10000. Purity of calcium carbonate: 99.9%,50 nm; the tetrahydrofuran homopolyether is characterized in that: purity: 99.9% and number average molecular weight 2500.
The esterified substance and the powder slurry are uniformly mixed by a homogenizer and enter a pre-polycondensation reactor.
The melt enters an up-flow pre-polycondensation reaction kettle to carry out pre-polycondensation reaction, the temperature of the melt is controlled at 240 ℃, and the time is 50 minutes; controlling the liquid level at 500mm and the vacuum degree at 800Pa, then feeding the melt into a final polycondensation kettle, and controlling the melt temperature to 260 ℃ for 60 minutes; the liquid level is controlled at 400mm, and the vacuum degree is controlled at 80Pa. After the intrinsic viscosity is 1.28dL/g through an online detection point, extruding, granulating, drying and packaging.
The infrared spectrum of the PBAT prepared is shown in FIG. 1, from which 21.43cm-1 and 2850.67cm-1 are methylene stretching vibration absorption peaks, the peak near 3358.15cm-1 is stretching vibration peak of copolyester hydroxyl, the peak near 1711.55cm-1 belongs to stretching vibration absorption peak of carbonyl-C = O, the peak near 1101.87cm-1 and 1267.46cm-1 is stretching vibration absorption peak of PBAT copolymer C-O-C group, 727.22cm-1 is out-of-plane bending vibration absorption peak of C-H on para-disubstituted benzene ring, and the peak 700-900cm-1 further illustrates the existence of benzene ring. The infrared spectrogram verifies the structure of the synthesized PBAT.
TGA curve (figure 2) of PBAT polymer for preparing low-cost biodegradable film for supermarket shopping bags is prepared, and TGA test conditions are as follows:
a thermal weight loss analysis tester of PerkinElmer in America is adopted, and the thermal weight loss analysis tester is used under the nitrogen atmosphere, wherein the gas flow is 100ml/min, the temperature range is 40-500 ℃, and the temperature rising speed is 10 ℃/min.
The ash content of the powder is 17.04% as can be seen from the curve.
The prepared low-cost PBAT polymer is blown into films, the film blowing process is smooth, the films are blown out uniformly without adhesion, the cost is low, and the method can be widely used for preparing supermarket shopping bag films. The processing temperature of the blown film is 155-175-170 ℃, and the thickness of the film is 5 microns.
Comparative example 1
On a small-sized flexible modified polyester continuous polyester polycondensation production device with the daily yield of 5-7 tons, the molar ratio of terephthalic acid to adipic acid is 1:1.31 and butanediol, in a molar ratio of 1:1.25, the catalyst is tetraisopropyl titanate. The addition amount thereof was 0.05% by mass of PTA. Beating for 40 minutes, and placing the mixture into a slurry supply tank for internal circulation for standby.
The obtained slurry is pumped into a first ester reaction kettle from a supply tank by a metering pump, the esterification reaction is carried out, the esterification temperature is controlled to be 170 ℃, the flow rate is controlled to be 200Kg/h, the liquid level is maintained to be 1300mm, and the esterification rate reaches 52 percent. The esterification product is pumped into a second esterification reaction kettle from the material to carry out esterification reaction, the temperature of the reactant is 215 ℃, the flow rate is controlled to be 200Kg/h, the liquid level is maintained at 1300mm, and the esterification rate reaches 99 percent. The esterified substance is pumped into a pipeline by a material pump and enters a pre-polycondensation reaction kettle.
The melt enters an up-flow pre-polycondensation reaction kettle to carry out pre-polycondensation reaction, the temperature of the melt is controlled at 240 ℃, and the time is 50 minutes; controlling the liquid level at 500mm and the vacuum degree at 800Pa, then feeding the melt into a final polycondensation kettle, and controlling the melt temperature to 260 ℃ for 60 minutes; the liquid level was controlled at 400mm and the vacuum degree at 80Pa. After the intrinsic viscosity number is 1.28dL/g, the mixture is extruded, granulated, dried and packaged at an online detection point.
Drying the prepared PBAT at 70 ℃ for 4 hours, then uniformly mixing the PBAT with 17 percent calcium carbonate (50 nanometers), carrying out extrusion granulation, drying the PBAT at 70 ℃ for 4 hours at the length-diameter ratio of 40/1 of a double-screw extruder, the temperature of the extruder being 110-125-135-145-150-145 ℃, the rotating speed of the extruder being 400rpm, blowing the PBAT at 155-175-170 ℃ and the thickness of the film being 5 micrometers.
Tensile strength: the tensile strength of the product was tested by the GB/T4456 standard method. Elongation at break: the elongation at break of the product was tested by the GB/T4456 standard method, with greater elongation at break indicating better toughness of the product. Test standard for hardness ISO868-2003. Test criteria for intrinsic viscosity: GB632-1993, the test standard for tear strength is GB6578, and the test standard for coefficient of friction is GB10006-1988. The standard for ash testing is TGA.
The prepared PBAT film has the tensile strength of 31MPa, the elongation at break of 490 percent, the hardness of 70A, the tearing strength of 170KN/m, the friction coefficient of 0.20 and the ash content of 17.04 percent, is smooth and stable in the film blowing process, does not adhere, has high quality, low cost and good toughness, and can well meet the low-cost use requirement of supermarket shopping bags.
The data for the performance of example 1 and comparative example 1 are compared for the purposes listed in fig. 4. As can be seen from FIG. 4, the mechanical property of example 1 is obviously superior to that of comparative example 1, secondary blending extrusion granulation is not needed, the cost is low, the strength is high, the toughness is good, the friction coefficient is small, and the film is not sticky, so that the low-cost use requirement of the supermarket shopping bag can be well met.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.
Claims (3)
1. A continuous preparation method of PBAT polymer for low-cost biodegradable film for supermarket shopping bags is characterized by comprising the following steps: the preparation method comprises the following steps: pulping, carrying out first-step esterification and second-step esterification, preparing powder slurry, carrying out pre-polycondensation reaction, and carrying out final polycondensation reaction;
the pulping step comprises: mixing the molar ratio of 1:1.31 mixture of terephthalic acid (PTA) and adipic acid and, in a molar ratio with respect to butanediol of 1:1.25 putting into a pulping kettle, adding a catalyst for pulping together, wherein the catalyst is tetrabutyl titanate or tetraisopropyl titanate, the addition amount of the catalyst is 0.03-0.05% of the mass of the terephthalic acid, the pulping is carried out for 30-50 minutes, and the catalyst is put into a slurry supply tank for internal circulation for standby, and the terephthalic acid is characterized in that: appearance was white powder, purity: 99.9%, density: 1.51g/cm 3 Said adipic acid being characterized in that: white powder in appearance, purity: 99.6 to 99.9%, said butanediol being characterized by: the appearance is colorless liquid, the purity is 99.6-99.9%, the boiling point is as follows: 225-228 ℃;
the first step of esterification comprises the following steps: pumping the slurry in the supply tank into a first esterification kettle for esterification reaction, controlling the esterification temperature to be 165-185 ℃ and the flow rate to be 190-210Kg/h in the esterification reaction, so that the liquid level is maintained at 1300-1500mm and the esterification rate reaches 51-55%;
the second step of esterification comprises the following steps: pumping the esterified material obtained in the first step into a second esterification reaction kettle by a pump for ester exchange, wherein the reaction temperature is controlled to be 215-225 ℃, the flow rate is controlled to be 190-210Kg/h, the liquid level is maintained to be 1300-1500mm, and the esterification rate reaches 96-99%;
the step of preparing powder slurry comprises the following steps: the weight ratio of silicon dioxide to calcium carbonate is 1:20-30, and then mixing with tetrahydrofuran homopolyether and butanediol according to the weight ratio of 25:5:70, grinding for 30-50 minutes in a ball mill, adding the powder slurry in a metering way through a pipeline injector, uniformly mixing the esterification product and the powder slurry which are injected into a melt pipeline through a metering pump through a pipeline homogenizer, wherein the adding amount of the powder slurry is 30-50% of the mass of a terephthalic acid reaction product, and in order to control the flow rate to be 80-100Kg/h, the mixture flows through the homogenizer on the pipeline and uniformly enters a pre-polycondensation reactor, and the silicon dioxide is characterized in that: white powder in appearance, purity: 99.5-99.9%, 8000-10000 mesh, purity of calcium carbonate: 99.5-99.9%, particle size 50-80 nm, the polyether is characterized in that: purity: 99.5-99.9%, number average molecular weight 2500-3000;
the pre-polycondensation reaction comprises the following steps: the melt enters an up-flow type pre-polycondensation reaction kettle for pre-polycondensation reaction, the temperature of the melt is controlled to be 235-245 ℃, the time is 30-60 minutes, the liquid level is controlled to be 500mm, and the vacuum degree is controlled to be 800-1500Pa;
the step of the final polycondensation reaction: the pre-condensation polymer enters a final condensation polymerization kettle, the temperature of the melt is controlled to reach 250-260 ℃, and the time is 60-60 minutes; the liquid level is controlled at 400mm, the vacuum degree is controlled at 30-100Pa, and after the intrinsic viscosity is 1.20-1.30 dL/g through an online detection point, the mixture is extruded, granulated, dried and packaged.
2. The continuous preparation method of the PBAT polymer for the low-cost biodegradable film for the supermarket shopping bags according to claim 1, which is characterized in that: the PBAT polymer for the low-cost biodegradable film for the supermarket shopping bag has the intrinsic viscosity of 1.20-1.30 dL/g, the tensile strength of 30-35MPa, the elongation at break of 400-500%, the hardness of 70-85A, the tear strength of 170KN/m, the friction coefficient of the film of 0.18-0.20 and the ash content of 10-20%.
3. A PBAT polymer for a low-cost biodegradable film for supermarket shopping bags is characterized in that: obtainable by the preparation process as claimed in claim 1 or 2.
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| CN106893273A (en) * | 2017-03-22 | 2017-06-27 | 中国科学院理化技术研究所 | A kind of calcium carbonate as shopping bag filling biodegradable plastic film material high and preparation method thereof |
| CN109679076A (en) * | 2018-12-29 | 2019-04-26 | 中国纺织科学研究院有限公司 | A kind of functional polyester product and preparation method thereof |
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Inventor after: Zhai Fengxiang Inventor after: Liu Bailin Inventor before: Liu Bailin |