CN115746407B - Film for fully degradable garbage bag and preparation method thereof - Google Patents
Film for fully degradable garbage bag and preparation method thereof Download PDFInfo
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- CN115746407B CN115746407B CN202211697558.0A CN202211697558A CN115746407B CN 115746407 B CN115746407 B CN 115746407B CN 202211697558 A CN202211697558 A CN 202211697558A CN 115746407 B CN115746407 B CN 115746407B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 229920000881 Modified starch Polymers 0.000 claims abstract description 37
- 239000004368 Modified starch Substances 0.000 claims abstract description 37
- 235000019426 modified starch Nutrition 0.000 claims abstract description 35
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 34
- 239000002253 acid Substances 0.000 claims abstract description 25
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 17
- 150000002500 ions Chemical class 0.000 claims abstract description 14
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229920002261 Corn starch Polymers 0.000 claims abstract description 12
- 208000034530 PLAA-associated neurodevelopmental disease Diseases 0.000 claims abstract description 12
- 239000008120 corn starch Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000004227 calcium gluconate Substances 0.000 claims abstract description 8
- 229960004494 calcium gluconate Drugs 0.000 claims abstract description 8
- 235000013927 calcium gluconate Nutrition 0.000 claims abstract description 8
- NEEHYRZPVYRGPP-UHFFFAOYSA-L calcium;2,3,4,5,6-pentahydroxyhexanoate Chemical compound [Ca+2].OCC(O)C(O)C(O)C(O)C([O-])=O.OCC(O)C(O)C(O)C(O)C([O-])=O NEEHYRZPVYRGPP-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229920001896 polybutyrate Polymers 0.000 claims abstract 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 39
- 238000003756 stirring Methods 0.000 claims description 29
- 238000010096 film blowing Methods 0.000 claims description 26
- 239000008187 granular material Substances 0.000 claims description 26
- 238000005469 granulation Methods 0.000 claims description 17
- 230000003179 granulation Effects 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 11
- 238000001125 extrusion Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 238000001291 vacuum drying Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 230000015556 catabolic process Effects 0.000 abstract description 8
- 238000006731 degradation reaction Methods 0.000 abstract description 8
- 229920002472 Starch Polymers 0.000 abstract description 5
- 230000004048 modification Effects 0.000 abstract description 5
- 238000012986 modification Methods 0.000 abstract description 5
- 239000008107 starch Substances 0.000 abstract description 5
- 235000019698 starch Nutrition 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 2
- 229920000728 polyester Polymers 0.000 abstract description 2
- 230000000813 microbial effect Effects 0.000 abstract 2
- 230000035755 proliferation Effects 0.000 abstract 2
- 239000004629 polybutylene adipate terephthalate Substances 0.000 description 12
- 229920002961 polybutylene succinate Polymers 0.000 description 10
- 239000004631 polybutylene succinate Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 7
- 239000002689 soil Substances 0.000 description 5
- 229920000747 poly(lactic acid) Polymers 0.000 description 4
- 239000004626 polylactic acid Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229920013716 polyethylene resin Polymers 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 229920005615 natural polymer Polymers 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- -1 polybutylene succinate Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 241000186660 Lactobacillus Species 0.000 description 1
- 241000235342 Saccharomycetes Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000005661 hydrophobic surface Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229940039696 lactobacillus Drugs 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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 film for a fully degradable garbage bag and a preparation method thereof, belonging to the technical field of garbage bag preparation, and comprising the following raw materials in parts by weight: 40-140 parts of acid modified starch, 100-110 parts of nano calcium carbonate, 35-45 parts of PBS, 385-495 parts of PBAT, 280-360 parts of PLA and 1.85-3 parts of maleic anhydride; the acid modified starch is prepared by carrying out ion modification on corn starch through calcium gluconate and further carrying out acid modification through citric acid. The acid modified starch in the inner layer of the film can form a large number of small crystals with polyester, so that the intermolecular acting force is enhanced, the film is more compact, the mechanical property and the water blocking property of the film are improved, active sites are provided for microbial proliferation, the starch is preferentially degraded, and the microbial proliferation is increased, so that the degradation rate of the outer layer of the film is improved.
Description
Technical Field
The invention belongs to the technical field of garbage bag preparation, and particularly relates to a film for a fully-degradable garbage bag and a preparation method thereof.
Background
Fully degradable disposal bags are disposal bags that can be completely decomposed into low molecular compounds by microorganisms (such as bacteria, fungi, algae, etc.) under appropriate and deadly-indicative natural environmental conditions. The film for fully degrading the garbage bag fully utilizes the potential characteristics of natural polymer materials and is prepared to be more excellent, and is a development trend of fully degrading the garbage bag.
Chinese patent CN106243451a discloses a starch-polyethylene resin blended fully degradable garbage bag and a preparation method thereof, the raw material components include corn starch and polyethylene resin, wherein the corn starch is a natural polymer, has reproducibility, biodegradability and biocompatibility, has excellent film forming capability, but has poor mechanical properties and water blocking properties due to strong hydrogen bond interaction inside natural starch particles; polyethylene resins, although degradable, generally take years to fully degrade in natural environments due to their extremely slow rate of biodegradation.
Disclosure of Invention
The invention aims to provide a fully-degradable film for garbage bags and a preparation method thereof, which are used for solving the problems in the background technology.
The aim of the invention can be achieved by the following technical scheme:
the fully degradable film for the garbage bag comprises the following raw materials in parts by weight: 40-140 parts of acid modified starch, 100-110 parts of nano calcium carbonate, 35-45 parts of PBS (polybutylene succinate), 385-495 parts of PBAT (polybutylene adipate-terephthalate), 280-360 parts of PLA (polylactic acid) and 1.85-3 parts of maleic anhydride;
the acid modified starch comprises the following preparation steps:
step one, drying corn starch at 50 ℃ for 16-20 hours, adding glycerol, stirring for 15-30 minutes, adding calcium gluconate, and stirring and mixing for 1-3 hours to obtain ion modified starch;
and step two, adding glycerol into the ion modified starch, stirring for 15-30min, adding citric acid, stirring and mixing for 1-3h, and conveying the mixture to a double-screw extruder for extrusion granulation to obtain the acid modified starch.
As a further scheme of the invention, the particle size of the nano calcium carbonate is 60-80nm. The nano calcium carbonate has oleophylic and hydrophobic surface and has the functions of filling, reinforcing and toughening.
As a further scheme of the invention, the mass ratio of the corn starch, the glycerol and the calcium gluconate in the step one is 8-10:4-5:0.35-1.4.
As a further scheme of the invention, the mass ratio of the ion modified starch, the glycerol and the citric acid in the second step is 8-10:4-5:0.08-0.1.
As a further scheme of the invention, the temperature of the twin-screw extruder in the second step is set to be 90-145 ℃ from the feeding section to the head section, and the rotating speed of the screw is 90-110rpm.
As a further scheme of the invention, the preparation method of the film for the fully-degradable garbage bag comprises the following steps:
s1, weighing raw materials according to a formula, mixing and stirring acid modified starch and nano calcium carbonate for 1-3 hours, and conveying the mixture to a double-screw granulator for granulation to obtain inner-layer granules;
s2, drying PBS, PBAT, PLA and maleic anhydride in vacuum at 50-80 ℃ for 10-12 hours, removing water and impurities, stirring for 1-3 hours, and conveying to a double-screw granulator for granulation to obtain outer-layer granules;
and S3, conveying the inner granular material and the outer granular material to two feed inlets of a coextrusion film blowing system respectively for extrusion film blowing, so as to obtain the film for the fully degradable garbage bag.
As a further aspect of the present invention, the coextrusion film blowing system of step S3 comprises two single screw extruders and one A/B/A film blowing head, the melt stream of the outer layer pellets being divided into two parts, and being combined with the inner layer pellets prior to the film blowing head to obtain a three-layer composite film.
As a further scheme of the invention, the temperature of a heating zone of the coextrusion film blowing system is 160-180 ℃, and the temperature of a film blowing machine head is 150 ℃.
The invention has the beneficial effects that:
1. the invention adopts the main raw materials of acid modified starch and PBS, PBAT, PLA which are all completely biodegradable materials, wherein:
(1) The acid-modified starch is prepared by ionizing and acid-modifying corn starch, wherein Ca 2+ The calcium gluconate reacts with starch/glycerol mixture, and the obtained chelate structure can remarkably improve the thermal property and mechanical property of the starch; the citric acid and the ion modified starch undergo hydrolysis reaction, so that the molecular weight of the ion modified starch is reduced, a large amount of small crystals can be formed with the polyester, the intermolecular acting force is enhanced, and the film is more compact, thereby being beneficial to improving the mechanical property and the water blocking property of the film;
(2) The PBAT has high elongation, excellent flexibility and good processability; PLA has reproducibility and biocompatibility, high strength and high rigidity; the maleic anhydride enhances the interaction of the maleic anhydride and the film, thereby improving the impact strength and the elongation at break of the film; the PBS main chain contains a large number of nonpolar methylene structures and ester bonds, so that the compatibility of PLA and PBAT is improved, the interaction force between PLA and PBAT molecules is reduced, and the tensile strength of the film is improved.
2. According to the invention, acid modified starch and nano calcium carbonate are mixed and granulated and used as the inner layer of the film, PBS, PBAT, PLA and maleic anhydride are mixed and granulated and used as the outer layer of the film, the acid modified starch in the inner layer of the film provides an active site for microorganism propagation, the starch is preferentially degraded, and microorganism propagation is increased, so that the degradation rate of the outer layer of the film is improved.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent 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
The acid modified starch comprises the following preparation steps:
step one, drying 800g of corn starch at 50 ℃ for 16 hours, adding 400g of glycerol, stirring for 15 minutes, adding 35g of calcium gluconate, and stirring and mixing for 1 hour to obtain ion modified starch;
adding 400g of glycerol into 800g of ion modified starch, stirring for 15min, adding 8g of citric acid, stirring and mixing for 1h, and conveying the mixture to a double-screw extruder (the temperature from a feeding section to a machine head section is set at 90-145 ℃ and the screw rotating speed is 90 rpm) for extrusion granulation to obtain the acid modified starch.
Example 2
The acid modified starch comprises the following preparation steps:
step one, drying 1000g of corn starch at 50 ℃ for 20 hours, adding 500g of glycerol, stirring for 30 minutes, adding 140g of calcium gluconate, and stirring and mixing for 3 hours to obtain ion modified starch;
adding 500g of glycerol into 1000g of ion modified starch, stirring for 30min, adding 10g of citric acid, stirring and mixing for 3h, and conveying the mixture to a double-screw extruder (the temperature from a feeding section to a machine head section is set at 90-145 ℃ and the screw rotating speed is 110 rpm) for extrusion granulation to obtain the acid modified starch.
Example 3
A preparation method of a film for a fully degradable garbage bag comprises the following steps:
step S1, weighing raw materials according to a formula, mixing 400g of the acid modified starch prepared in the embodiment 1 and 1000g of nano calcium carbonate (the particle size of the nano calcium carbonate is 60-80 nm), stirring for 1h, and conveying the mixture to a double-screw granulator for granulation to obtain inner-layer granules;
step S2, carrying out vacuum drying on 350g of PBS, 3850g of PBAT, 2800g of PLA and 18.5g of maleic anhydride at 50 ℃ for 10 hours, stirring for 1 hour, and conveying to a double-screw granulator for granulation to obtain outer-layer granules;
and S3, respectively conveying the inner-layer granules and the outer-layer granules to two feed inlets of a coextrusion film blowing system (comprising two single-screw extruders and an A/B/A film blowing machine head, wherein the temperature of a heating zone is 160 ℃, and the temperature of the film blowing machine head is 150 ℃) to extrude and blow films, so as to obtain the film for the fully-degradable garbage bag.
Example 4
A preparation method of a film for a fully degradable garbage bag comprises the following steps:
step S1, weighing raw materials according to a formula, mixing 1400g of acid modified starch prepared in the embodiment 2 and 1100g of nano calcium carbonate (the particle size of the nano calcium carbonate is 60-80 nm), stirring for 3 hours, and conveying the mixture to a double-screw granulator for granulation to obtain inner-layer granules;
s2, carrying out vacuum drying on 450g of PBS, 4950g of PBAT, 3600g of PLA and 30g of maleic anhydride at 80 ℃ for 12 hours, stirring for 3 hours, and conveying to a double-screw granulator for granulation to obtain outer-layer granules;
and S3, respectively conveying the inner-layer granules and the outer-layer granules to two feed inlets of a coextrusion film blowing system (comprising two single-screw extruders and an A/B/A film blowing machine head, wherein the temperature of a heating zone is 180 ℃, and the temperature of the film blowing machine head is 150 ℃) to extrude and blow films, so as to obtain the film for the fully-degradable garbage bag.
Example 5
A preparation method of a film for a fully degradable garbage bag comprises the following steps:
step S1, weighing raw materials according to a formula, mixing and stirring 900g of the acid modified starch prepared in the embodiment 1 and 1050g of nano calcium carbonate (the particle size of the nano calcium carbonate is 60-80 nm) for 1h, and conveying the mixture to a double-screw granulator for granulation to obtain inner-layer granules;
step S2, carrying out vacuum drying on 400g of PBS, 4400g of PBAT, 3200g of PLA and 18.5g of maleic anhydride at 50 ℃ for 10 hours, stirring for 1 hour, and conveying to a double-screw granulator for granulation to obtain outer-layer granules;
and S3, respectively conveying the inner-layer granules and the outer-layer granules to two feed inlets of a coextrusion film blowing system (comprising two single-screw extruders and an A/B/A film blowing machine head, wherein the temperature of a heating zone is 160 ℃, and the temperature of the film blowing machine head is 150 ℃) to extrude and blow films, so as to obtain the film for the fully-degradable garbage bag.
Comparative example 1
In this comparative example, as compared with example 3, only "400g of the acid-modified starch prepared in example 1 was" changed to "400g of corn starch", i.e., the corn starch was not subjected to ion modification and acid modification, and the other steps and parameters were the same.
Comparative example 2
A preparation method of a film for a fully degradable garbage bag comprises the following steps:
step S1, weighing raw materials according to a formula, vacuum-drying 400g of acid modified starch prepared in the embodiment 1, 1000g of nano calcium carbonate, 350g of PBS, 3850g of PBAT, 2800g of PLA and 18.5g of maleic anhydride at 50 ℃ for 10 hours, stirring for 1 hour, and conveying to a double-screw granulator for granulation to obtain granules;
and S2, conveying the granules to an extrusion film blowing system for extrusion film blowing, and obtaining the film for the fully-degradable garbage bag.
The films for fully degradable garbage bags prepared in examples 3 to 5 and comparative examples 1 to 2 were subjected to the following performance tests:
mechanical property test: tensile strength and elongation at break are tested according to GB/T1040-G92 standard, and the tensile speed is 20mm/min;
and (3) water resistance performance test: water vapour transmission capacity was tested according to GB/T1037-2021: the water vapor permeation was measured at 38.+ -. 0.5 ℃ per 90.+ -. 2RH 2 The mass of the film to be measured is g/m 2 ·24h；
Degradation performance test: and (3) dividing a proper amount of soil into 5 groups, preparing a soil-buried environment containing lactobacillus and saccharomycetes with the water content of 35%, spreading soil with the thickness of 10cm at the bottom of an experimental container, putting a film to be tested on the soil, and spreading soil with the thickness of 10cm on the film to be tested, and repeating the steps. After 30d of testing, the film to be tested is taken out of the soil, rinsed, dried to constant weight in vacuum at 60 ℃, observed and weighed to record data. The calculation formula of the degradation rate of the film to be tested (the experimental result is obtained by taking the average value of 6 data under the same condition) is as follows:
N(％)＝(m 0 －m t )/m 0 ×100％
wherein: m is the degradation rate of the film to be tested; m is m 0 The initial mass of the film to be tested; m is m t The film to be tested is dried to constant weight quality when the degradation time is t.
The test results are shown in Table 1.
TABLE 1
| Test item | Example 3 | Example 4 | Example 5 | Comparative example 1 | Comparative example 2 |
| Tensile Strength/MPa | 46.78 | 46.80 | 51.59 | 12.68 | 18.97 |
| Elongation at break/% | 586.65 | 584.96 | 585.40 | 425.44 | 433.56 |
| Water vapor transmission rate/(g/m) 2 ·24h) | 0 | 0 | 0 | 307.12 | 382.67 |
| Degradation rate/% | 31.8 | 33.4 | 32.7 | 32.3 | 18.5 |
As can be seen from Table 1, the films for fully degradable garbage bags prepared in examples 3-5 have better mechanical properties and water blocking properties and faster degradation rate than the films for fully degradable garbage bags prepared in comparative examples 1-2.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The fully degradable film for the garbage bag is characterized by comprising the following raw materials in parts by weight: 40-140 parts of acid modified starch, 100-110 parts of nano calcium carbonate, 35-45 parts of PBS, 385-495 parts of PBAT, 280-360 parts of PLA and 1.85-3 parts of maleic anhydride;
the acid modified starch comprises the following preparation steps:
step one, drying corn starch at 50 ℃ for 16-20 hours, adding glycerol, stirring for 15-30 minutes, adding calcium gluconate, and stirring and mixing for 1-3 hours to obtain ion modified starch;
step two, adding glycerol into the ion modified starch, stirring for 15-30min, adding citric acid, stirring and mixing for 1-3h, and conveying the mixture to a double-screw extruder for extrusion granulation to obtain acid modified starch;
step one, the mass ratio of the corn starch, the glycerol and the calcium gluconate is 8-10:4-5:0.35-1.4;
step two, the mass ratio of the ion modified starch, the glycerol and the citric acid is 8-10:4-5:0.08-0.1;
the preparation method of the film for the fully-degradable garbage bag comprises the following steps:
s1, weighing raw materials according to a formula, mixing and stirring acid modified starch and nano calcium carbonate for 1-3 hours, and conveying the mixture to a double-screw granulator for granulation to obtain inner-layer granules;
s2, vacuum drying PBS, PBAT, PLA and maleic anhydride at 50-80 ℃ for 10-12 hours, stirring for 1-3 hours, and conveying to a double-screw granulator for granulation to obtain outer-layer granules;
and S3, conveying the inner granular material and the outer granular material to two feed inlets of a coextrusion film blowing system respectively for extrusion film blowing, so as to obtain the film for the fully degradable garbage bag.
2. The fully degradable disposal bag film of claim 1, wherein the particle size of the nano calcium carbonate is 60-80nm.
3. The fully degradable disposal bag film of claim 1, wherein the temperature of said twin screw extruder in step two is set to 90-145 ℃ from the feeding section to the head section, and the screw speed is 90-110rpm.
4. The method for preparing the film for the fully degradable garbage bag according to claim 1, which is characterized by comprising the following steps:
s1, weighing raw materials according to a formula, mixing and stirring acid modified starch and nano calcium carbonate for 1-3 hours, and conveying the mixture to a double-screw granulator for granulation to obtain inner-layer granules;
s2, vacuum drying PBS, PBAT, PLA and maleic anhydride at 50-80 ℃ for 10-12 hours, stirring for 1-3 hours, and conveying to a double-screw granulator for granulation to obtain outer-layer granules;
and S3, conveying the inner granular material and the outer granular material to two feed inlets of a coextrusion film blowing system respectively for extrusion film blowing, so as to obtain the film for the fully degradable garbage bag.
5. The method for preparing the film for the fully degradable garbage bag, which is claimed in claim 4, wherein the coextrusion film blowing system comprises two single screw extruders and one A/B/A film blowing machine head.
6. The method for preparing the film for the fully degradable garbage bag, which is characterized in that the temperature of a heating zone of the coextrusion film blowing system is 160-180 ℃, and the temperature of a film blowing machine head is 150 ℃.
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| CN109929229A (en) * | 2019-04-19 | 2019-06-25 | 浙江中科应化科技有限公司 | Poly terephthalic acid-adipic acid fourth diester/starch full-biodegradable film with and preparation method thereof |
| CN113652063A (en) * | 2021-08-02 | 2021-11-16 | 安徽瑞鸿新材料科技有限公司 | Calcium carbonate filled PBAT/PLA degradable film and preparation method thereof |
| CN113845621A (en) * | 2021-10-15 | 2021-12-28 | 江苏安普林新材料研究院有限公司 | Compatibilizer and high-starch-content full-biodegradable film adopting same |
| CN113861635A (en) * | 2021-10-19 | 2021-12-31 | 上海复命新材料科技有限公司 | Starch modified PBAT/PLA biodegradable plastic film and preparation method thereof |
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