AU2021104309A4 - Degradable packaging bag and preparation method thereof - Google Patents
Degradable packaging bag and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—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
- 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
- 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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/02—Starch; Degradation products thereof, e.g. dextrin
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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
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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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
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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
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Abstract
DEGRADABLE PACKAGING BAG AND PREPARATION METHOD THEREOF
ABSTRACT
The disclosure provides a degradable packaging bag including by weight: 5-10 parts of
polylactic acid (PLA); 60-70 parts of polybutylene adipate terephthalate (PBAT); 25-30
parts of corn starch; and 0.1-0.3 parts of a crosslinking agent.
11
Description
[0001] The disclosure relates to the field of degradable packaging equipment, and more particularly, to a degradable packaging bag and a preparation method thereof.
[0002] Plastic bags have characteristics of high strength, light weight, corrosion resistance, and low price, thus, people often use plastic bags to hold things in their daily lives. However, while bringing great convenience to people, application of plastic bags also has serious negative effects. For example, in addition to being degradable under special conditions, speed that most of discarded plastic bags may be degraded by light or biodegradation speed in natural environment is very slow, and the discarded plastic bags may take hundreds of years to completely disappear. A large number of discarded plastic bags may not be self-degraded, and long-time residues in the natural environment can cause serious environmental pollution, which not only affects ecological balance, but also threatens human health.
[0003] With promulgation of "Opinions of National Development and Reform Commission and Ministry of Ecology and Environment on Further Strengthening the Treatment of Plastic Pollution", time for banning on plastics in many parts of the country has entered a countdown. The first to be banned is use of non-degradable plastic films, plastic shopping bags, plastic packaging bags, and the like.
[0004] Therefore, preparation of packaging bags that are degradable and does not pollute the environment is what people urgently need.
[0005] At present, there are some "degradable" packaging bags on the market, but most of their production processes are complicated and cumbersome. For example, they are prepared by adding bio-based ingredients, or adding photo-oxidation degradable masterbatch to PP or PE. Because of containing more or less non-degradable materials,
"degradable" packaging bags on the market cannot be regarded as a real degradable product.
[0006] In view of problems in existing technologies, the disclosure provides a degradable packaging bag and a preparation method thereof, with characteristics of reasonable design and compact structure, which solves the problems of "degradable" packaging bag in existing technologies, such as having complicated and cumbersome production process, containing some non-degradable materials with poor degradability. Raw materials used in the degradable packaging bag in the disclosure are all degradable. In addition, compatibility effect of each raw material is improved by adding a crosslinking agent, thus, performance of the product is improved. Further, the degradable packaging bag in the disclosure may be widely used in supermarkets or stores for disposable packaging because of simple processing by using a simple preparation process.
[0007] A degradable packaging bag comprises by weight: 5-10 parts of polylactic acid (PLA); 60-70 parts of polybutylene adipate terephthalate (PBAT); 25-30 parts of corn starch; and 0.1-0.3 parts of a crosslinking agent.
[0008] Further, the crosslinking agent is 1, 4-bis-tert-butyl diisopropyl benzene peroxide (BIBP).
[0009] Further, a method for preparing a degradable packaging bag comprises:
[0010] 1) preparing and drying PLA, PBAT, and corn starch under vacuum at 80-90°C for 5-6 hours;
[0011] 2) placing the dried PLA, PBAT, and corn starch in a mixing box to mix the same according to a formula for the degradable packaging bag, and fully stirring the mixture with a stirring rod for 1-3 hours;
[0012] 3) melting and extruding the mixture on a twin-screw extruder, water-cooling and pelletizing the extruded mixture, where the temperature range of the twin-screw extruder from the inlet to the outlet is respectively, 185°C, 190°C, 195°C, and 195°C, 195°C, 195°C; the size of the obtained blend masterbatch is 3-5 mm, which can be easily blown film; then drying the obtained blend masterbatch at 60°C for 12 hours;
[0013] 4) blowing the dried blend masterbatch on a film blowing machine, pressing the blown blend masterbatch into a film, and printing the film with ink; the blowing conditions: first stage: 185°C; second stage: 190°C; third stage: 195°C; fourth stage: 200°C; fifth stage: 195°C; where the traction speed is 5 rpm and the winding speed is 8.23 rpm; and
[0014] 5) cutting and sub-rolling the blow film into a finished product of the required specifications by using a bag making machine or a heat sealing machine.
[0015] Further, in 3), the screw speed of the twin-screw extruder is 190 rpm, the feeding speed is 4 kg/min, the barrel diameter is 16 mm, the screw diameter is 15.5 mm, the thread depth is 3.4 mm, and the barrel length (L/D) is 25: 1.
[0016] Further, in 4), the film is printed with UV ink.
[0017] Further, in 4), the film-blow pressure is 10 MPa to 12 MPa.
[0018] The following advantages are associated with a degradable packaging bag and a preparation method thereof:
[0019] 1. The raw materials for the packaging bags of the disclosure are all degradable, non-toxic and non-hazardous in combination with the production method.
[0020] 2. The crosslinking agent improves grafting performance of the molecular chain between PLA and PBAT. Compatibility of PBAT is applied to blown film production to improve product performance.
[0021] 3. The preparation method of the disclosure is suitable for simple blow film products, and can be widely used in disposable packaging in supermarkets or stores.
[0022] 4. Corn starch is used instead of traditional starch, because PLA is extracted from corn starch, which is compatible with corn starch.
[0023] To further illustrate the disclosure, embodiments detailing a degradable packaging bag and a preparation method thereof are described below. It should be noted that the following embodiments are intended to describe and not limit disclosure.
Example 1
[0024] A degradable packaging bag comprises by weight: 10 parts of polylactic acid (PLA); 70 parts of polybutylene adipate terephthalate (PBAT); 30 parts of corn starch; and 0.3 parts of a crosslinking agent.
[0025] Corn starch is used instead of traditional starch, because PLA is extracted from corn starch, which is compatible with corn starch.
[0026] The cross-linking agent is preferably 1,4-bis-tert-butyl diisopropyl benzene (BIBP), which is non-toxic and odorless. The cross-linking agent improves grafting performance of the molecular chain between PLA and PBAT, improves the compatibility between PLA and PBAT, and is applied for blown film production.
[0027] A method for preparing a degradable packaging bag comprises:
[0028] 1) Polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), and corn starch under vacuum are dried at 80-90°C for 5-6 hours;
[0029] 2) the dried PLA, PBAT, and corn starch are mixed in a mixing box according to the formula, and then stirred for 1-3 hours with a stirring rod;
[0030] 3) the mixture is melted and extruded on a twin-screw extruder, then water cooled, and pelletized, where the temperature range of the twin-screw extruder from the inlet to the outlet is 185°C, 190°C, 195°C, 195°C, 195°C, 195°C, the screw speed is 190 rpm, the feeding speed is 4 kg/min, the barrel diameter is 16 mm, the screw diameter is 15.5 mm, the thread depth is 3.4 mm, the barrel length (L/D) is 25:1;
[0031] In 3), the obtained blend masterbatch has a size of 3-5 mm, facilitating film blowing; and then is dried at 60°C for 12 hours;
[0032] 4) the blend masterbatch obtained in 3) is blown on a film blowing machine, press into a film, and printed with ink, where the film blowing conditions: one stage: 185°C; second stage: 190°C; third stage: 195°C; four stage: 200°C; five stage: 195°C, the traction speed is 5 rpm, and the winding is 8.23 rpm.
[0033] In 4), the film is printed with UV ink, which has good adhesion and abrasion resistance, the surface of the resulting film is flat and smooth, without bubbles, rupture, obvious black spots or impurities, which overcomes the problems of similar products or other plastic products in the process of extrusion blown film, such as uneven thickness, rough surface, and yellowing.
[0034] The pressure of blow molding is 10 MPa-12M Pa.
[0035] 5) The film in 4) is cut and sub-rolled into a finished product package with the required specifications by using a bag making machine or a heat sealing machine.
[0036] The packaging bag of the disclosure comprises degradable, non-toxic and non hazardous raw materials which are in combination with the production method.
[0037] The preparation method of the disclosure is suitable for simple blow molding products, and can be widely used in disposable packaging in supermarkets or stores;
[0038] The drying process procedures improves the curing and crystallization effects of PLA and PBAT, improving the product performance.
Example 2
[0039] The difference between this Example and Example 1 is as follows: a degradable packaging bag comprises by weight: 5 parts of PLA; 60 parts of PBAT; 25 parts of corn starch; 0.1 part of a crosslinking agent.
Example 3
[0040] The difference between this Example and Example 1 is as follows: a degradable packaging bag comprises by weight: 8 parts of PLA; 65 parts of PBAT; 27 parts of corn starch; 0.2 parts of a crosslinking agent.
Example 4
[0041] The difference between this Example and Example 1 is as follows:
[0042] A degradable packaging bag comprises by weight: 15 parts of PLA; 55 parts of PBAT; 35 parts of corn starch; 0.3 parts of a crosslinking agent.
Example 5
[0043] The difference between this Example and Example 1 is as follows:
[0044] A degradable packaging bag comprises by weight: 10 parts of PLA; 70 parts of PBAT; 30 parts of corn starch.
Example 6
[0045] The difference between this Example and Example 1 is as follows: the drying process is not involved in the method for preparing the degradable packaging bag.
[0046] The following experiments are carried out to measure the various properties of the packaging bags of Examples 1-5, as shown in Table 1.
Table 1:
Degradation Tensile strength Elongation Water resistance rate (%) (MPa) rate (%) (unit)
Example 1 95.6 24.8 465 0 Example 2 96.1 25.2 450 0 Example 3 96.3 25.6 485 0 Example 4 94.5 16.5 425 1 Example 5 93.2 12.6 210 3
Example 94.6 18.3 320 2
[0047] Table 1 is a comparison table of degradation rate, tensile strength, elongation at break, and water resistance of degradable packaging bags obtained in different examples.
[0048] Degradability test: In accordance with Appendix D: Test Method for Compostability of Biodegradable Materials in "GB/T 18006.2-1999 Degradability Test Method for Disposable Degradable Tableware", the biodegradability R is tested and calculated in %.
[0049] Tensile strength test: in accordance with "GB/T 1040.1-2018 Determination of the Tensile Properties of Plastics", the tensile strength is tested in MPa.
[0050] Elongation at break test: According to "GB/T 1040.1-2018 Determination of Tensile Properties of Plastics", the tensile breaking strain is tested and calculated in %.
[0051] Water resistance test: According to "GB T 24984-2010 Daily Plastic Bags" 5.6.2 Anti-leakage test, observe whether there are dripping water droplets in the three plastic bags of each group of tests, and the number of plastic bags with dripping water droplets is recorded.
[0052] According to various performance tests and various indicators in Table 1, it is not difficult to see that the best example is Example 3. From the comparison of Example 1, Example 2 and Example 4, the content of each is different, which has a little effect on the performance of the degradable packaging bags, but each content in Example 3 reaches the optimal rate.
[0053] According to the comparison between Example 1 and Example 5, it can be seen that the effect of the crosslinking agent on the degradable packaging bags is significant, thereby improving compatibility and performance of the degradable packaging bags.
[0054] According to the comparison between Example 1 and Example 6, it is indicated that the drying process in the preparation method affects the curing and crystallization of PLA and PBAT, which also plays a vital role in the performance of the degradable packaging bags.
[0055] It would be obvious to those skilled in the arts that changes and modifications may be made; therefore, the aim of the appended claims is to cover all such changes and modifications.
Claims (6)
1. A degradable packaging bag, comprising by weight:
5-10 parts of polylactic acid (PLA);
60-70 parts of polybutylene adipate terephthalate (PBAT);
25-30 parts of corn starch; and
0.1-0.3 parts of a crosslinking agent.
2. The degradable packaging bag of claim 1, wherein the crosslinking agent is 1, 4
bis-tert-butyl diisopropyl benzene peroxide (BIBP).
3. A method for preparing a degradable packaging bag of claim 1, the method
comprising:
1) preparing and drying PLA, PBAT, and corn starch under vacuum at 80 90°C for 5-6 hours;
2) placing the dried PLA, PBAT, and corn starch in a mixing box to mix the same according to a formula for the degradable packaging bag, and fully stirring the mixture with a stirring rod for 1-3 hours;
3) melting and extruding the mixture on a twin-screw extruder, water cooling and pelletizing the extruded mixture, wherein a temperature range of the twin-screw extruder from an inlet to an outlet thereof is respectively, 185°C, 190°C, 195°C, 195°C, 195°C, and 195°C; a size of an obtained blend masterbatch is 3-5 mm; and drying the obtained blend masterbatch at 60°C for 12 hours;
4) blowing the dried blend masterbatch on a film blowing machine, pressing the blown blend masterbatch into a film, and printing the film with ink; the blowing conditions: first stage: 185°C; second stage: 190°C; third stage: 195°C; fourth stage: 200°C; fifth stage: 195°C; wherein a traction speed is 5 rpm and a winding speed is 8.23 rpm; and
5) cutting and sub-rolling the blow film into a finished product of required specifications by using a bag making machine or a heat sealing machine.
4. The method of claim 3, wherein in 3), a screw speed of the twin-screw extruder is
190 rpm, a feeding speed is 4 kg/min, a barrel diameter is 16 mm, a screw
diameter is 15.5 mm, a thread depth is 3.4 mm, and a barrel length (L /D) is 25: 1.
5. The method of claim 3, wherein in 4), the film is printed with UV ink.
6. The method of claim 3, wherein in 4), a film-blow pressure is 10 MPa to 12 MPa.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110428081.5 | 2021-04-21 | ||
| CN202110428081.5A CN113121964A (en) | 2021-04-21 | 2021-04-21 | Environment-friendly degradable packaging bag and preparation method thereof |
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| AU2021104309A4 true AU2021104309A4 (en) | 2021-09-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114015203B (en) * | 2021-10-14 | 2023-08-18 | 寿光金远东变性淀粉有限公司 | Preparation method of starch-based full-biodegradable plastic lifting rope for greenhouse vegetable cultivation |
| CN114407395A (en) * | 2022-01-25 | 2022-04-29 | 广西顺兴包装有限公司 | Manufacturing process of square-bottom valve bag |
| CN114835937A (en) * | 2022-05-12 | 2022-08-02 | 嘉兴华悦包装用品有限公司 | Production process for blowing and printing integrated vest bag |
| CN114851672B (en) * | 2022-07-07 | 2022-09-02 | 山东兰德英科新材料科技有限公司 | Method for preparing infusion bag by adopting biodegradable infusion bag special material |
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| CN111454555A (en) * | 2020-05-20 | 2020-07-28 | 嵊州市森拓新材料有限公司 | High-strength modified polylactic acid degradable composite material and preparation method thereof |
| CN112500611B (en) * | 2020-10-30 | 2022-04-12 | 东莞市鑫海环保材料有限公司 | Biodegradable plastic bag and preparation method thereof |
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