CN114106526A - Production process of degradable plastic bag - Google Patents
Production process of degradable plastic bag Download PDFInfo
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- CN114106526A CN114106526A CN202111551095.2A CN202111551095A CN114106526A CN 114106526 A CN114106526 A CN 114106526A CN 202111551095 A CN202111551095 A CN 202111551095A CN 114106526 A CN114106526 A CN 114106526A
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- pbat
- pla
- starch
- plastic bag
- degradable plastic
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- 229920006238 degradable plastic Polymers 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 229920001896 polybutyrate Polymers 0.000 claims abstract description 67
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 41
- 239000004626 polylactic acid Substances 0.000 claims abstract description 41
- 229920003023 plastic Polymers 0.000 claims abstract description 39
- 239000004033 plastic Substances 0.000 claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 34
- 229920000881 Modified starch Polymers 0.000 claims abstract description 32
- 239000004368 Modified starch Substances 0.000 claims abstract description 32
- 238000002156 mixing Methods 0.000 claims abstract description 32
- 235000019426 modified starch Nutrition 0.000 claims abstract description 32
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 32
- 239000004416 thermosoftening plastic Substances 0.000 claims abstract description 32
- 229920002472 Starch Polymers 0.000 claims abstract description 30
- 235000019698 starch Nutrition 0.000 claims abstract description 30
- 239000008107 starch Substances 0.000 claims abstract description 30
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000004342 Benzoyl peroxide Substances 0.000 claims abstract description 21
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims abstract description 21
- 235000019400 benzoyl peroxide Nutrition 0.000 claims abstract description 21
- 239000004629 polybutylene adipate terephthalate Substances 0.000 claims abstract description 17
- 238000001125 extrusion Methods 0.000 claims abstract description 16
- 239000000155 melt Substances 0.000 claims abstract description 16
- -1 polybutylene adipate-terephthalate Polymers 0.000 claims abstract description 11
- 208000034530 PLAA-associated neurodevelopmental disease Diseases 0.000 claims abstract description 9
- 238000010096 film blowing Methods 0.000 claims abstract description 8
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 claims description 21
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 18
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 12
- 239000002202 Polyethylene glycol Substances 0.000 claims description 10
- 229920001610 polycaprolactone Polymers 0.000 claims description 10
- 239000004632 polycaprolactone Substances 0.000 claims description 10
- 229920001223 polyethylene glycol Polymers 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 229920001685 Amylomaize Polymers 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 6
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims description 6
- 238000006467 substitution reaction Methods 0.000 claims description 6
- 230000021736 acetylation Effects 0.000 claims description 2
- 238000006640 acetylation reaction Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims 1
- 150000003254 radicals Chemical class 0.000 description 8
- 230000000397 acetylating effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920000856 Amylose Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000011203 carbon fibre reinforced carbon Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Wrappers (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a production process of a degradable plastic bag, belonging to the field of degradable plastics, and comprising the following steps: s1, mixing thermoplastic modified starch and PBAT, adding polybutylene adipate-terephthalate (PBT) -grafted maleic anhydride compatilizer obtained by melt grafting of maleic anhydride and PBAT, and preparing a starch/PBAT blend by a melt extrusion blending method; s2, mixing the starch/PBAT blend with PLA, adding Benzoyl Peroxide (BPO) as a compatilizer, and preparing the PLA/PBAT blend by adopting a melt extrusion blending method; s3, preparing the PLA/PBAT blend into a plastic bag by using a film blowing machine and a bag making machine. In the invention, the polybutylene adipate-terephthalate grafted maleic anhydride greatly improves the interfacial compatibility between PBAT and starch, and can effectively improve the tensile strength and elongation at break of the prepared plastic bag; when the BPO is melted, extruded and blended, the compatibility of PLA and PBAT can be effectively improved, and the toughness of the prepared plastic bag is increased.
Description
Technical Field
The invention relates to the field of degradable plastics, in particular to a production process of a degradable plastic bag.
Background
Plastics are synthetic high molecular compounds, which are materials polymerized by using monomer raw materials through synthesis or condensation reaction. In daily life, plastic products have penetrated the aspects of our life, and various plastic products bring convenience to our life, but most of plastics are difficult to degrade, so that a large amount of white garbage is generated after the plastics are discarded, and great harm is generated to the ecological environment and animals and plants in the nature. The degradable plastic is characterized in that the chemical structure of the degradable plastic is obviously changed under specific environmental conditions, and the degradable plastic can be degraded by using certain factors in the environment after being discarded, so that the accumulation of plastic wastes in the environment can be reduced.
The plastic bag is the most general and the shortest plastic products of live time of using, and survey shows, before every plastic bag was abandoned, its life was only 12 minutes, consequently promoted the use of degradable plastic bag and can effectively slow down the destruction of abandonment plastics to the environment, but, the bearing capacity of current degradable plastic bag is relatively poor than ordinary plastic bag, is unfavorable for the popularization and use of degradable plastic bag.
Disclosure of Invention
Based on this, there is a need for a production process of degradable plastic bags, comprising the following steps:
s1, mixing thermoplastic modified starch and PBAT, adding polybutylene adipate-terephthalate (PBT) -grafted maleic anhydride compatilizer obtained by melt grafting of maleic anhydride and PBAT, and preparing a starch/PBAT blend by a melt extrusion blending method;
s2, mixing the starch/PBAT blend with PLA, adding Benzoyl Peroxide (BPO) as a compatilizer, and preparing the PLA/PBAT blend by adopting a melt extrusion blending method;
s3, preparing the PLA/PBAT blend into a plastic bag by using a film blowing machine and a bag making machine.
Wherein, the polybutylene adipate-terephthalate graft maleic anhydride greatly improves the interfacial compatibility between PBAT and starch, and can effectively improve the tensile strength and the elongation at break of the plastic bag;
when the BPO is melted, extruded and blended, a primary free radical can be generated due to thermal decomposition, then the primary free radical initiates PLA and PBAT macromolecular chains to react to generate a macromolecular chain free radical, and finally the two macromolecular chain free radicals can be combined to form a carbon-carbon bond connection, so that the compatibility of the PLA and the PBAT can be effectively improved, and the toughness of the plastic bag is increased; therefore, the invention can improve the toughness, tensile strength and elongation at break of the plastic bag, and further can effectively improve the bearing capacity of the plastic bag.
Further, the mass ratio of the PBAT, the PLA and the thermoplastic modified starch is 10-20:0.7-1.3:2.7-5.3, and the optimal mass ratio is 15:1: 4.
Further, the preparation method of the thermoplastic modified starch comprises the following steps: and (3) carrying out acetylation treatment on the starch by using an esterifying agent acetic anhydride, and adding pyridine as a catalyst to prepare the thermoplastic modified starch.
The starch is acetylated by using an esterifying agent acetic anhydride, so that the starch has good thermoplasticity and certain hydrophobicity, the absorption of the plastic bag to moisture in the using process can be reduced, the durability of the plastic bag is improved, the substitution degree of the thermoplastic modified starch is preferably greater than 1.4, and the hydrophobicity of the thermoplastic modified starch can be obviously improved.
Further, the starch is a high amylose starch, such as starch made from high amylose corn.
Wherein, the reduction of the amylose content in the starch can significantly increase the fracture productivity of the thermoplastic modified starch.
Further, in step S1, the added compatibilizer further includes citric acid.
The citric acid is used as the compatilizer, so that the passing of water vapor by the plastic bag can be reduced, the water resistance of the plastic bag can be correspondingly increased, the absorption of the starch in the plastic bag to water can be reduced, the strength of the plastic bag can be further enhanced, and the bearing capacity of the plastic bag can be improved.
Further, in step S2, the added compatibilizer further includes Polycaprolactone (PCL) and polyethylene glycol (PEG).
The polyethylene glycol (PEG) and the Polycaprolactone (PCL) can effectively improve the interaction between PLA and PBAT chain segments and the binding force between two phase interfaces, and further can improve the tensile strength, the bending strength, the impact strength and the modulus of the PLA/PBAT blend on the basis that the toughness of the PLA/PBAT blend is enhanced by Benzoyl Peroxide (BPO), so that the strength of the plastic bag is increased, and the prepared plastic bag has larger bearing capacity.
Further, before step 2, the method also comprises the following steps of pre-treating PLA: maleic anhydride is grafted onto PLA to prepare maleic anhydride grafted polylactic acid.
The maleic anhydride grafted polylactic acid can be combined with hydroxyl on the starch, so that the compatibility between the starch and the PLA can be improved, the interface bonding force is improved, and the strength of the prepared plastic bag can be further improved.
The principle and effect of the present invention will be further explained by combining the above technical solutions:
in the invention, the polybutylene adipate-terephthalate grafted maleic anhydride greatly improves the interfacial compatibility between PBAT and starch, and can effectively improve the tensile strength and elongation at break of the prepared plastic bag; when the BPO is melted, extruded and blended, a primary free radical can be generated due to thermal decomposition, then the primary free radical initiates PLA and PBAT macromolecular chains to react to generate a macromolecular chain free radical, and finally the two macromolecular chain free radicals can be combined to form a carbon-carbon bond connection, so that the compatibility of the PLA and the PBAT can be effectively improved, and the toughness of the prepared plastic bag is increased; therefore, the invention can improve the toughness, tensile strength and elongation at break of the prepared plastic bag, and further can effectively improve the bearing capacity of the prepared plastic bag.
Detailed Description
In order to facilitate understanding for those skilled in the art, the present invention will be described in further detail below with reference to examples:
example 1
A production process of a degradable plastic bag comprises the following steps:
s1, mixing thermoplastic modified starch and PBAT, adding polybutylene adipate-terephthalate (PBT-MAH) grafted maleic anhydride obtained by melt grafting of maleic anhydride and PBAT as a compatilizer, and preparing a starch/PBAT blend by a melt extrusion blending method;
s2, mixing the starch/PBAT blend with PLA, adding Benzoyl Peroxide (BPO) as a compatilizer, and preparing the PLA/PBAT blend by adopting a melt extrusion blending method;
s3, preparing the PLA/PBAT blend into a plastic bag by using a film blowing machine and a bag making machine.
Wherein the mass ratio of the PBAT to the PLA to the thermoplastic modified starch is 15:1: 4.
Example 2
A production process of a degradable plastic bag comprises the following steps:
s0, acetylating high amylose starch by using an esterifying agent acetic anhydride, and adding pyridine as a catalyst to prepare thermoplastic modified starch, wherein the substitution degree of the thermoplastic modified starch is larger than 1.4;
s1, mixing the prepared thermoplastic modified starch and PBAT, adding polybutylene adipate-terephthalate (PBT-MAH) grafted maleic anhydride obtained by melt grafting of maleic anhydride and PBAT as a compatilizer, and then preparing a starch/PBAT blend by a melt extrusion blending method;
s2, mixing the starch/PBAT blend with PLA, adding Benzoyl Peroxide (BPO) as a compatilizer, and preparing the PLA/PBAT blend by adopting a melt extrusion blending method;
s3, preparing the PLA/PBAT blend into a plastic bag by using a film blowing machine and a bag making machine.
Wherein the mass ratio of the PBAT to the PLA to the thermoplastic modified starch is 15:1: 4.
Example 3
A production process of a degradable plastic bag comprises the following steps:
s0, acetylating high amylose starch by using an esterifying agent acetic anhydride, and adding pyridine as a catalyst to prepare thermoplastic modified starch, wherein the substitution degree of the thermoplastic modified starch is larger than 1.4;
s1, mixing the prepared thermoplastic modified starch with PBAT, adding polybutylene adipate terephthalate (PBT) grafted maleic anhydride obtained by melt grafting of maleic anhydride and PBAT and citric acid as compatilizers, and preparing a starch/PBAT blend by a melt extrusion blending method;
s2, mixing the starch/PBAT blend with PLA, adding Benzoyl Peroxide (BPO) as a compatilizer, and preparing the PLA/PBAT blend by adopting a melt extrusion blending method;
s3, preparing the PLA/PBAT blend into a plastic bag by using a film blowing machine and a bag making machine.
Wherein the mass ratio of the PBAT to the PLA to the thermoplastic modified starch is 15:1: 4.
Example 4
A production process of a degradable plastic bag comprises the following steps:
s0, acetylating high amylose starch by using an esterifying agent acetic anhydride, and adding pyridine as a catalyst to prepare thermoplastic modified starch, wherein the substitution degree of the thermoplastic modified starch is larger than 1.4;
s1, mixing the prepared thermoplastic modified starch with PBAT, adding polybutylene adipate terephthalate (PBT) grafted maleic anhydride obtained by melt grafting of maleic anhydride and PBAT and citric acid as compatilizers, and preparing a starch/PBAT blend by a melt extrusion blending method;
s2, mixing the starch/PBAT blend with PLA, adding Benzoyl Peroxide (BPO), Polycaprolactone (PCL) and polyethylene glycol (PEG) as compatilizers, and preparing the PLA/PBAT blend by adopting a melt extrusion blending method;
s3, preparing the PLA/PBAT blend into a plastic bag by using a film blowing machine and a bag making machine.
Wherein the mass ratio of the PBAT to the PLA to the thermoplastic modified starch is 15:1: 4.
Example 5
A production process of a degradable plastic bag comprises the following steps:
s0, acetylating high amylose starch by using an esterifying agent acetic anhydride, and adding pyridine as a catalyst to prepare thermoplastic modified starch, wherein the substitution degree of the thermoplastic modified starch is larger than 1.4;
s1, mixing the prepared thermoplastic modified starch with PBAT, adding polybutylene adipate terephthalate (PBT) grafted maleic anhydride obtained by melt grafting of maleic anhydride and PBAT and citric acid as compatilizers, and preparing a starch/PBAT blend by a melt extrusion blending method;
s2, grafting maleic anhydride to PLA to prepare maleic anhydride grafted polylactic acid;
s3, mixing the starch/PBAT blend with maleic anhydride grafted polylactic acid, adding Benzoyl Peroxide (BPO), Polycaprolactone (PCL) and polyethylene glycol (PEG) as compatilizers, and preparing the PLA/PBAT blend by adopting a melt extrusion blending method;
s4, preparing the PLA/PBAT blend into a plastic bag by using a film blowing machine and a bag making machine.
Wherein the mass ratio of the PBAT to the PLA to the thermoplastic modified starch is 15:1: 4.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. The production process of the degradable plastic bag is characterized by comprising the following steps:
s1, mixing thermoplastic modified starch and PBAT, adding polybutylene adipate-terephthalate (PBT) -grafted maleic anhydride compatilizer obtained by melt grafting of maleic anhydride and PBAT, and preparing a starch/PBAT blend by a melt extrusion blending method;
s2, mixing the starch/PBAT blend with PLA, adding Benzoyl Peroxide (BPO) as a compatilizer, and preparing the PLA/PBAT blend by adopting a melt extrusion blending method;
s3, preparing the PLA/PBAT blend into a plastic bag by using a film blowing machine and a bag making machine.
2. The production process of degradable plastic bags according to claim 1, wherein the mass ratio of PBAT, PLA and thermoplastic modified starch is 10-20:0.7-1.3: 2.7-5.3.
3. The production process of degradable plastic bags according to claim 2, characterized in that the mass ratio of PBAT, PLA and thermoplastic modified starch is 15:1: 4.
4. The production process of the degradable plastic bag according to claim 2 or 3, wherein the preparation method of the thermoplastic modified starch comprises the following steps: and (3) carrying out acetylation treatment on the starch by using an esterifying agent acetic anhydride, and adding pyridine as a catalyst to prepare the thermoplastic modified starch.
5. The process for producing degradable plastic bags according to claim 4, wherein the starch is high amylose starch.
6. The process for producing degradable plastic bags according to claim 5, wherein the degree of substitution of the thermoplastic modified starch is greater than 1.4.
7. The process for producing degradable plastic bags according to claim 4, wherein the compatibilizer added in step S1 further comprises citric acid.
8. The process for producing degradable plastic bags according to claim 4, wherein the compatibilizer added in step S2 further comprises Polycaprolactone (PCL) and polyethylene glycol (PEG).
9. The process for producing degradable plastic bags according to claim 4, further comprising a pre-treatment of PLA before step 2: maleic anhydride is grafted onto PLA to prepare maleic anhydride grafted polylactic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111551095.2A CN114106526A (en) | 2021-12-17 | 2021-12-17 | Production process of degradable plastic bag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111551095.2A CN114106526A (en) | 2021-12-17 | 2021-12-17 | Production process of degradable plastic bag |
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| CN114106526A true CN114106526A (en) | 2022-03-01 |
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| CN202111551095.2A Pending CN114106526A (en) | 2021-12-17 | 2021-12-17 | Production process of degradable plastic bag |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110698844A (en) * | 2019-10-28 | 2020-01-17 | 浙江晟祺实业有限公司 | Novel degradable packaging material and preparation method thereof |
| CN112500611A (en) * | 2020-10-30 | 2021-03-16 | 东莞市鑫海环保材料有限公司 | Biodegradable plastic bag and preparation method thereof |
| CN113754992A (en) * | 2021-09-28 | 2021-12-07 | 河南工业大学 | Biodegradable plastic film and preparation method thereof |
-
2021
- 2021-12-17 CN CN202111551095.2A patent/CN114106526A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110698844A (en) * | 2019-10-28 | 2020-01-17 | 浙江晟祺实业有限公司 | Novel degradable packaging material and preparation method thereof |
| CN112500611A (en) * | 2020-10-30 | 2021-03-16 | 东莞市鑫海环保材料有限公司 | Biodegradable plastic bag and preparation method thereof |
| CN113754992A (en) * | 2021-09-28 | 2021-12-07 | 河南工业大学 | Biodegradable plastic film and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 张水洞: "酯化淀粉的研究进展", 《化学研究与应用》 * |
| 张贺等: "PBAT-g-MA对热塑性淀粉/聚己二酸-对苯二甲酸丁二酯共混合金性能的影响", 《塑料工业》 * |
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Application publication date: 20220301 |