CN117327379A - Full-biodegradation vest bag and preparation method thereof - Google Patents
Full-biodegradation vest bag and preparation method thereof Download PDFInfo
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- CN117327379A CN117327379A CN202311335743.XA CN202311335743A CN117327379A CN 117327379 A CN117327379 A CN 117327379A CN 202311335743 A CN202311335743 A CN 202311335743A CN 117327379 A CN117327379 A CN 117327379A
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- starch
- vest bag
- vest
- inorganic filler
- film
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- 238000002360 preparation method Methods 0.000 title abstract description 70
- 238000006065 biodegradation reaction Methods 0.000 title abstract description 7
- 229920002472 Starch Polymers 0.000 claims abstract description 60
- 239000008107 starch Substances 0.000 claims abstract description 60
- 235000019698 starch Nutrition 0.000 claims abstract description 60
- 229920000881 Modified starch Polymers 0.000 claims abstract description 48
- 239000004368 Modified starch Substances 0.000 claims abstract description 48
- 235000019426 modified starch Nutrition 0.000 claims abstract description 48
- 229920002261 Corn starch Polymers 0.000 claims abstract description 41
- 239000008120 corn starch Substances 0.000 claims abstract description 41
- 240000003183 Manihot esculenta Species 0.000 claims abstract description 40
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims abstract description 40
- 239000011256 inorganic filler Substances 0.000 claims abstract description 39
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 25
- 239000000701 coagulant Substances 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 239000004014 plasticizer Substances 0.000 claims abstract description 19
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 17
- -1 poly (terephthalic acid) -adipic acid-butanediol ester Chemical class 0.000 claims abstract description 16
- 239000004626 polylactic acid Substances 0.000 claims abstract description 16
- 239000004970 Chain extender Substances 0.000 claims abstract description 15
- 239000000314 lubricant Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 238000010096 film blowing Methods 0.000 claims abstract description 12
- 230000000655 anti-hydrolysis Effects 0.000 claims abstract description 11
- 239000007822 coupling agent Substances 0.000 claims abstract description 8
- 238000013508 migration Methods 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 7
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 239000003607 modifier Substances 0.000 claims abstract description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 90
- 239000001913 cellulose Substances 0.000 claims description 46
- 229920002678 cellulose Polymers 0.000 claims description 46
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 45
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 41
- FCBUKWWQSZQDDI-UHFFFAOYSA-N rhamnolipid Chemical compound CCCCCCCC(CC(O)=O)OC(=O)CC(CCCCCCC)OC1OC(C)C(O)C(O)C1OC1C(O)C(O)C(O)C(C)O1 FCBUKWWQSZQDDI-UHFFFAOYSA-N 0.000 claims description 40
- 235000004347 Perilla Nutrition 0.000 claims description 32
- 235000012054 meals Nutrition 0.000 claims description 32
- 230000002209 hydrophobic effect Effects 0.000 claims description 29
- 239000002245 particle Substances 0.000 claims description 27
- 239000000843 powder Substances 0.000 claims description 24
- 241000241413 Propolis Species 0.000 claims description 22
- 229940069949 propolis Drugs 0.000 claims description 22
- 230000007062 hydrolysis Effects 0.000 claims description 16
- 238000006460 hydrolysis reaction Methods 0.000 claims description 16
- 239000003112 inhibitor Substances 0.000 claims description 9
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 9
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 8
- 239000004200 microcrystalline wax Substances 0.000 claims description 7
- 235000019808 microcrystalline wax Nutrition 0.000 claims description 7
- 150000001718 carbodiimides Chemical class 0.000 claims description 6
- ISCWFTAITDXUKO-UHFFFAOYSA-N oxiran-2-ylmethyl 2-methylprop-2-enoate prop-2-enoic acid styrene Chemical compound C(C=C)(=O)O.C=CC1=CC=CC=C1.C(C(=C)C)(=O)OCC1CO1 ISCWFTAITDXUKO-UHFFFAOYSA-N 0.000 claims description 6
- 238000012986 modification Methods 0.000 claims description 5
- 230000004048 modification Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000454 talc Substances 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- 244000124853 Perilla frutescens Species 0.000 claims 2
- 238000007789 sealing Methods 0.000 abstract description 28
- 239000002861 polymer material Substances 0.000 abstract description 6
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 abstract description 4
- 238000007664 blowing Methods 0.000 abstract description 3
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 abstract description 2
- 241000229722 Perilla <angiosperm> Species 0.000 description 30
- 238000003756 stirring Methods 0.000 description 23
- 238000000034 method Methods 0.000 description 21
- 238000005507 spraying Methods 0.000 description 19
- 238000006731 degradation reaction Methods 0.000 description 17
- 230000015556 catabolic process Effects 0.000 description 15
- 238000001035 drying Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 12
- 244000005700 microbiome Species 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000011049 filling Methods 0.000 description 6
- PEDCQBHIVMGVHV-UHFFFAOYSA-N glycerol group Chemical group OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 239000002985 plastic film Substances 0.000 description 5
- 229920006255 plastic film Polymers 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 102000004169 proteins and genes Human genes 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- 239000004382 Amylase Substances 0.000 description 2
- 102000013142 Amylases Human genes 0.000 description 2
- 108010065511 Amylases Proteins 0.000 description 2
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 2
- 239000006087 Silane Coupling Agent Substances 0.000 description 2
- 235000019418 amylase Nutrition 0.000 description 2
- YNLZFQPOEWEPTM-UHFFFAOYSA-N butane-1,1-diol;hexanedioic acid;terephthalic acid Chemical compound CCCC(O)O.OC(=O)CCCCC(O)=O.OC(=O)C1=CC=C(C(O)=O)C=C1 YNLZFQPOEWEPTM-UHFFFAOYSA-N 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000600 sorbitol Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UZBRNILSUGWULW-UHFFFAOYSA-N 3,8-dioxabicyclo[8.2.2]tetradeca-1(12),10,13-triene-2,9-dione;hexanedioic acid Chemical compound OC(=O)CCCCC(O)=O.O=C1OCCCCOC(=O)C2=CC=C1C=C2 UZBRNILSUGWULW-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229920003232 aliphatic polyester Polymers 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920000704 biodegradable plastic Polymers 0.000 description 1
- 229920002988 biodegradable polymer Polymers 0.000 description 1
- 239000004621 biodegradable polymer Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000012222 talc Nutrition 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/46—Applications of disintegrable, dissolvable or edible materials
- B65D65/466—Bio- or photodegradable packaging materials
-
- 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
-
- 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
-
- 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
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- 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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application relates to the field of high polymer materials, and particularly discloses a full-biodegradation vest bag and a preparation method thereof; a fully biodegradable vest bag comprising the following raw materials: poly (terephthalic acid) -poly (butylene glycol) adipate, poly (lactic acid), modified starch, inorganic filler, coagulant, anti-hydrolysis agent, chain extender and lubricant; the modified starch is a mixture of corn starch and tapioca starch modified by a modifier, and the modifier comprises a plasticizer, a compatilizer, a coupling agent and an anti-migration agent; the preparation method comprises the following steps: uniformly mixing the poly (terephthalic acid) -adipic acid-butanediol ester and the polylactic acid, and then adding modified starch, inorganic filler, coagulant, anti-hydrolysis agent, chain extender and lubricant to uniformly mix to prepare a mixture; extruding and granulating the mixture to prepare the film blowing resin; blowing film to obtain a blend film; the blended film is made into bags to prepare vest bags; has the advantages of low cost, high quality, high heat sealing strength and complete biodegradation after use.
Description
Technical Field
The application relates to the field of high polymer materials, in particular to a full-biodegradation vest bag and a preparation method thereof.
Background
The widespread use of plastic articles, particularly plastic film articles, has led to increasing environmental problems and petroleum crisis in the world today; therefore, the development of biodegradable polymer materials to replace petroleum-based plastics has become a hot spot of current research.
Among the many biodegradable plastics developed, poly (butylene terephthalate-adipate) (PBAT) is a completely biodegradable aliphatic polyester, which has been widely used in film production due to its superior flexibility and processability. However, films prepared from PBAT have low strength and high cost and are limited in many fields of application. Therefore, the PBAT is generally blended and modified with other materials to improve the service performance and expand the application range.
At present, the high price of PBAT is a main reason for influencing popularization and application. Therefore, the filling modification of the material in the processing process can reduce the cost and achieve the purpose of reinforcing and toughening to a certain extent. The filling modification of the PBAT is mainly divided into two types of starch filling and inorganic filling, and the filling modification can effectively reduce the production cost, so that the starch and inorganic filling PBAT full-biodegradable blend film material is of great concern and has been widely applied and studied. However, the surface of the starch-filled PBAT blend film has a plasticizer precipitation phenomenon, so that the hand feeling is sticky, and the inorganic-filled PBAT blend film has poor heat sealing performance; therefore, there is a need to further improve the film properties of starch and inorganic filled PBAT to meet market usage requirements.
Therefore, how to prepare a film which is low in cost, high in quality, high in heat seal strength and capable of being completely biodegraded after use is a problem to be solved.
Disclosure of Invention
In order to prepare a film which is low in cost, high in quality, high in heat sealing strength and capable of being completely biodegraded after being used, the application provides a full biodegraded vest bag and a preparation method thereof.
In a first aspect, the present application provides a fully biodegradable vest bag, which adopts the following technical scheme:
a full-biodegradable vest bag comprises the following raw materials in parts by weight: 55-90 parts of poly (terephthalic acid) -adipic acid-butanediol ester, 1-5 parts of polylactic acid, 5-30 parts of modified starch, 5-30 parts of inorganic filler, 0.5-1.5 parts of coagulant, 0.2-0.6 part of hydrolysis resistance agent, 0.1-0.3 part of chain extender and 0.1-0.5 part of lubricant;
the modified starch is a mixture of corn starch and tapioca starch modified by a modifier, and the modifier comprises the following raw materials in parts by weight: 2-12 parts of plasticizer, 0.1-0.3 part of compatilizer, 0.1-1 part of coupling agent and 0.2-0.6 part of anti-migration agent.
By adopting the technical scheme, the poly (terephthalic acid) -poly (butylene glycol) adipate, the polylactic acid and the modified starch can be degraded, and the polylactic acid and the modified starch can provide nutrition for microorganisms in the degradation process, so that the propagation of the microorganisms is promoted, and the degradation speed is improved; meanwhile, the inorganic filler promotes the inorganic material in the vest bag to be rapidly separated from the high-molecular polymer by utilizing the rapid disintegration effect in the degradation process, and increases the contact area between the high-molecular polymer and microorganisms, thereby further improving the degradation efficiency.
The addition of modified starch and inorganic filler reduces the addition amount of the poly (terephthalic acid) -adipic acid-butanediol ester, thereby reducing the product cost; the modified starch and the inorganic filler are added, so that the finished vest bag has higher strength and better toughness, thereby having higher quality; meanwhile, the plasticizer and the compatilizer in the modified starch are matched with the polybutylene terephthalate-adipic acid-butanediol ester and the inorganic filler, so that the heat sealing strength of the finished vest bag is improved by utilizing the good bonding compatibility of the plasticizer and the compatilizer.
Preferably, the weight ratio of the corn starch to the tapioca starch is 90:10-10:90.
By adopting the technical scheme, the tapioca starch mainly comprises starch molecules and amylase, the corn starch comprises the components of the starch molecules, the protein, the fatty acid and the like, and the growth and the propagation of microorganisms are promoted by utilizing the cooperation of the starch molecules, the amylase, the protein and the fatty acid, so that the degradation of the finished vest bag is promoted.
Preferably, the corn starch and the tapioca starch are respectively carrier corn starch and carrier tapioca starch, and the carrier corn starch consists of corn starch, rhamnolipid solution and perilla meal powder in a weight ratio of 1:0.1-0.3:0.2-0.4; the carrier tapioca starch consists of tapioca starch, rhamnolipid solution and perilla meal powder in a weight ratio of 1:0.1-0.3:0.2-0.4.
By adopting the technical scheme, the surfaces of the corn starch and the tapioca starch are coated with the rhamnolipid solution, and then the perilla meal is bonded, so that the adhesion of the perilla meal with the corn starch and the tapioca starch is facilitated by utilizing the viscosity of the rhamnolipid solution; and the hydrophilic end of the rhamnolipid is lipophilic, and the hydroxyl of the hydrophilic end in the rhamnolipid is mutually attracted and connected with the hydroxyl in the starch molecule, so that the hydrophobic end of the rhamnolipid faces outwards.
After the plastic film is prepared, if the plastic film is placed for a period of time and then is manufactured into a vest bag, starch molecules in the film are easy to absorb moisture, so that internal molecular expansion is easy to generate, the connection between starch and high polymer plastic is affected, internal expansion stress is generated, and substances such as a plasticizer, an inorganic filler and the like are not directly connected with the high polymer material and are only bonded by means of the viscosity of the high polymer material in a hot melting way, so that once the internal expansion stress is generated, the problems of surface precipitation of the plasticizer and the inorganic filler are easy to occur, the quality is affected, and the problem that the heat sealing strength is difficult to reduce due to moisture absorption is also easy to the film.
Corn starch, tapioca starch, rhamnolipid solution and perilla meal powder are matched, and the rhamnolipid solution and the perilla meal powder are coated, so that the surface of starch particles is sequentially loaded with the rhamnolipid and the perilla meal powder; the hydrophobicity of the perilla meal powder is matched with the hydrophobicity of one side of the rhamnolipid solution close to the surface of the perilla meal powder, so that the starch particles are prevented from absorbing moisture as much as possible, and the internal starch particles are prevented from absorbing moisture after the film is placed for a period of time as much as possible, so that internal expansion stress is generated; the porous structure of the perilla meal is matched with the supporting network of the rhamnolipid to provide space for internal molecular expansion stress, so that even if the internal expansion stress is generated, the precipitation of a plasticizer and an inorganic filler caused by the expansion stress can be avoided as much as possible; meanwhile, the heat sealing strength of the finished vest bag is further ensured by utilizing the hot melting viscosity of rhamnolipid, and the mechanical strength of the finished vest bag can be ensured by stably bonding the plasticizer and the inorganic filler, so that the finished vest bag has higher quality and longer service life.
Corn starch, tapioca starch, rhamnolipid solution and perilla meal powder are matched, and when the corn starch, tapioca starch, rhamnolipid solution and perilla meal powder are degraded, the porous structure of the perilla meal powder is matched with protein, cellulose and the like in the perilla meal, so that the growth and propagation of microorganisms in soil are promoted, and the degradation speed is improved; the porous structure can further increase the contact area between microorganisms and the finished vest bag, and the degradation rate is improved; meanwhile, the rapid degradation of rhamnolipid, perilla meal and starch particles can promote the rapid disintegration of the internal structure of the vest bag, thereby further increasing the contact area of microorganisms and each component in the vest bag and improving the overall degradation rate of the vest bag.
Preferably, the inorganic filler is one or more of talcum powder and calcium carbonate.
By adopting the technical scheme, the micron-sized talcum powder and the nano-sized calcium carbonate are matched, and different grading particle sizes are utilized, so that the plastic film structure for preparing the vest bag is compact, and the mechanical strength and the service life of the finished vest bag can be further improved by matching with the higher strength of the talcum powder and the calcium carbonate.
Preferably, the talcum powder is prepared by modifying talcum powder particles through propolis liquid and hydrophobic cellulose fibrils; the calcium carbonate is prepared by modifying calcium carbonate particles through propolis and hydrophobic cellulose fibrils.
By adopting the technical scheme, talcum powder and calcium carbonate are placed for a period of time after film blowing due to smaller particle size, and the heat sealing effect and the heat sealing strength are easily reduced due to moisture absorption.
Talcum powder, calcium carbonate, propolis liquid and hydrophobic cellulose fibrils are matched, the propolis melt liquid is adhered to the surfaces of the talcum powder and the calcium carbonate, and can fill the pores of part of the cellulose fibrils, and the water-blocking property of the propolis and the hydrophobic effect of the hydrophobic cellulose fibrils are utilized, so that the cellulose fibrils, the talcum powder and the calcium carbonate are prevented from absorbing moisture, and the heat sealing strength of a finished vest bag is improved; and utilize the flexibility of cellulose fibril, can increase talcum powder, calcium carbonate's specific surface area moreover, not only improve talcum powder, calcium carbonate and macromolecular material's area of contact, improve bonding stability, but also can prevent that calcium carbonate and talcum powder from appearing agglomerating the problem, make calcium carbonate and talcum powder can be comparatively even and stable disperse in the undershirt bag, even place a period after blowing, cooperation coagulant, hydrolysis inhibitor, lubricant and propolis's hydrophobicity, also be difficult for making undershirt bag inside raw materials moisture absorption, thereby can guarantee undershirt bag's heat-seal effect and heat-seal intensity.
The propolis and cellulose fibrils can realize degradation, can ensure the biodegradation effect of the vest bag, and the surface of the propolis is lipophilic and is convenient for being connected with modified starch in an attractive manner, so that the bonding stability between the raw materials in the vest bag is improved, and the finished vest bag has the advantages of degradability, high mechanical strength and high heat sealing strength.
Preferably, the hydrophobic cellulose fibrils are prepared by hydrophobically modifying cellulose fibrils with methyl silicone oil.
Through adopting above-mentioned technical scheme, cellulose fibril, methyl silicone oil phase cooperation utilizes softening, the dispersibility of methyl silicone oil, not only can improve the pliability of cellulose fibril, can give the hydrophobic effect of cellulose fibril in addition, be convenient for cooperate with assistants such as coagulant, chain extender, hydrolysis inhibitor simultaneously, improve the bonding compatibility of each raw materials, thereby improve the structure compactness of undershirt bag, make undershirt bag have better mechanical strength, higher heat-seal intensity and longer life, even place or use under humid environment, also can guarantee that undershirt bag has longer life.
Preferably, the coagulant consists of sodium polyacrylate and microcrystalline wax in a weight ratio of 1:0.1-0.3.
By adopting the technical scheme, the sodium polyacrylate is matched with the microcrystalline wax, the carboxyl in the sodium polyacrylate is matched with the polylactic acid, the poly (terephthalic acid) -adipic acid-butanediol ester and the inorganic filler, and the anchoring connection principle is utilized to improve the fusion bonding of the inorganic filler, the poly (terephthalic acid) -adipic acid-butanediol ester and the polylactic acid, so that the mechanical strength of a finished product is improved, and the heat sealing strength of the finished product is improved; the microcrystalline wax has good lubricating effect, and can smooth the connection surface of inorganic filler and polymer materials such as poly (terephthalic acid) -adipic acid-butanediol ester, so that the film surface is smooth and free of flocculent particle agglomeration, thereby improving the quality of the finished vest bag.
Preferably, the chain extender is an oligomer of styrene-acrylic acid-glycidyl methacrylate.
By adopting the technical scheme, the styrene-acrylic acid-glycidyl methacrylate oligomer, the poly terephthalic acid-adipic acid-butanediol ester, the inorganic filler, the modified starch and the polylactic acid are matched, so that the molecular chain is expanded, the bonding compatibility between the raw materials in the vest bag can be improved, the mechanical strength of the finished vest bag is improved, and the service life of the vest bag is prolonged.
Preferably, the hydrolysis inhibitor is a polymeric carbodiimide hydrolysis inhibitor.
By adopting the technical scheme, amino, inorganic filler, polylactic acid and styrene-acrylic acid-glycidyl methacrylate oligomer in the polymerization carbodiimide hydrolysis resisting agent are matched, so that the bonding compatibility between basic raw materials is improved, and the water resistance effect is achieved by improving the structural density; the polymerization type carbodiimide hydrolysis resistance agent is matched with the propolis for modifying the hydrophobic groups on the fiber surface and the inorganic filler, so that the hydrophobicity of the finished vest bag is further improved, and the vest bag has better hydrolysis resistance, higher mechanical strength and longer service life; but also has higher heat seal strength.
In a second aspect, the present application provides a method for preparing a fully biodegradable vest bag, which adopts the following technical scheme: a method for preparing a fully biodegradable vest bag, comprising the following steps:
s1, uniformly mixing the poly (terephthalic acid) -adipic acid-butanediol ester and the polylactic acid, and then adding modified starch, inorganic filler, coagulant, anti-hydrolysis agent, chain extender and lubricant to uniformly mix to prepare a mixture;
s2, extruding and granulating the mixture to prepare the film blowing resin; the film blowing resin is processed by film blowing to prepare a blend film;
s3, preparing bags from the blend film to obtain the finished vest bag.
By adopting the technical scheme, the finished vest bag has the advantages of low cost, high quality, high heat seal strength and complete biodegradation after use.
In summary, the present application has the following beneficial effects:
1. the modified starch and the inorganic filler are added, so that the addition amount of the modified starch and the inorganic filler is reduced, the product cost is reduced, and the finished vest bag has higher strength and better toughness, so that the finished vest bag has higher quality; meanwhile, the plasticizer and the compatilizer in the modified starch are matched with the polybutylene terephthalate-adipic acid-butanediol ester and the inorganic filler, so that the heat sealing strength of the finished vest bag is improved by utilizing the good bonding compatibility of the plasticizer and the compatilizer.
2. Corn starch, tapioca starch, rhamnolipid solution and perilla meal are matched, and hydrophobicity of the perilla meal is matched with hydrophobicity of one side of the rhamnolipid solution close to the surface of the perilla meal, so that moisture absorption of starch particles is prevented as much as possible, and internal expansion stress is reduced; and the porous structure of the perilla meal is matched with the supporting network of the rhamnolipid to provide space for internal molecular expansion stress, so that the phenomenon that the plasticizer and the inorganic filler are separated out due to the expansion stress is avoided as much as possible, and the vest bag is ensured to have higher heat sealing strength.
3. Talcum powder, calcium carbonate, propolis liquid and cellulose fibrils are matched, the moisture absorption of the cellulose fibrils, talcum powder and calcium carbonate is prevented by utilizing the water resistance of the propolis, and the heat sealing strength of the finished vest bag is improved; even if the film is placed for a period of time after being blown, the film is matched with the coagulant, the anti-hydrolysis agent, the lubricant and the hydrophobicity of the propolis, the raw materials inside the vest bag are not easy to absorb moisture, so that the heat sealing effect and the heat sealing strength of the vest bag can be ensured.
Detailed Description
The present application is described in further detail below with reference to examples.
Preparation example of Supported corn starch
Rhamnolipids in the following raw materials were purchased from wuhan Hua Xiangke biotechnology limited; other raw materials and equipment are all commonly and commercially available.
Preparation example 1: the carrier corn starch is prepared by the following method:
the rhamnolipid solution is a rhamnolipid methanol solution with the mass fraction of 1%, and the mass fraction of methanol is 90%;
extracting oil from fructus Perillae to obtain fructus Perillae cake, scattering, drying to obtain fructus Perillae cake powder, and sieving with 800 mesh sieve; uniformly spraying 0.2kg of rhamnolipid solution in 1kg of corn starch, wherein the adding speed of rhamnolipid is 20g/min, stirring at the rotating speed of 80r/min in the adding process, uniformly stirring and mixing, uniformly spraying 0.3kg of perilla meal powder, and drying and dispersing to obtain the finished product.
Preparation example 2: the present preparation example differs from preparation example 1 in that:
uniformly spraying 0.1kg of rhamnolipid solution in 1kg of corn starch, wherein the adding speed of rhamnolipid is 20g/min, stirring at the rotating speed of 80r/min in the adding process, uniformly stirring and mixing, uniformly spraying 0.2kg of perilla meal powder, and drying and dispersing to obtain the finished product.
Preparation example 3: the present preparation example differs from preparation example 1 in that:
uniformly spraying 0.3kg of rhamnolipid solution in 1kg of corn starch, wherein the adding speed of rhamnolipid is 20g/min, stirring at the rotating speed of 80r/min in the adding process, uniformly stirring and mixing, uniformly spraying 0.4kg of perilla meal powder, and drying and dispersing to obtain the finished product.
Preparation example of Carrier cassava starch
Preparation example 4: the carrier tapioca starch is prepared by the following method:
the rhamnolipid solution is a rhamnolipid methanol solution with the mass fraction of 1%, and the mass fraction of methanol is 90%;
extracting oil from fructus Perillae to obtain fructus Perillae cake, scattering, drying to obtain fructus Perillae cake powder, and sieving with 800 mesh sieve; uniformly spraying 0.2kg of rhamnolipid solution in 1kg of cassava starch, wherein the adding speed of rhamnolipid is 20g/min, stirring at the rotating speed of 80r/min in the adding process, uniformly stirring and mixing, uniformly spraying 0.3kg of perilla meal powder, and drying and dispersing to obtain the finished product.
Preparation example 5: the present preparation example differs from preparation example 4 in that:
uniformly spraying 0.1kg of rhamnolipid solution in 1kg of cassava starch, wherein the adding speed of rhamnolipid is 20g/min, stirring at the rotating speed of 80r/min in the adding process, uniformly stirring and mixing, uniformly spraying 0.2kg of perilla meal powder, and drying and dispersing to obtain the finished product.
Preparation example 6: the present preparation example differs from preparation example 4 in that:
uniformly spraying 0.3kg of rhamnolipid solution in 1kg of cassava starch, wherein the adding speed of rhamnolipid is 20g/min, stirring at the rotating speed of 80r/min in the adding process, uniformly stirring and mixing, uniformly spraying 0.4kg of perilla meal powder, and drying and dispersing to obtain the finished product.
Preparation example of modified starch
The anti-migration agent in the following raw materials is purchased from Shanghai Qian Bao fine chemical industry Co., ltd; model PA-107; other raw materials are all commonly and commercially available.
Preparation example 7: the modified starch is prepared by the following method:
weighing 53.7kg of corn starch, 20kg of tapioca starch, 10kg of plasticizer, 0.2kg of compatilizer, 0.3kg of coupling agent and 0.3kg of anti-migration agent, mixing and putting into a high-speed mixer, stirring for 15min at the rotating speed of 1000r/min, enabling the material to reach 80 ℃, and discharging to obtain modified starch; the plasticizer is glycerol; the compatilizer is maleic anhydride; the coupling agent is silane coupling agent KH-570.
Preparation example 8: the present preparation example differs from preparation example 7 in that:
weighing 10kg of corn starch, 90kg of tapioca starch, 2kg of plasticizer, 0.1kg of compatilizer, 0.1kg of coupling agent and 0.2kg of anti-migration agent, mixing and putting into a high-speed mixer, stirring for 10min at the rotating speed of 1000r/min, enabling the material to reach 70 ℃, and discharging to obtain modified starch; corn starch and tapioca starch are both commonly commercially available; the plasticizer is glycerol; the compatilizer is maleic anhydride; the coupling agent is silane coupling agent KH-570.
Preparation example 9: the present preparation example differs from preparation example 7 in that:
90kg of corn starch, 10kg of tapioca starch, 12kg of plasticizer, 0.3kg of compatilizer, 1kg of coupling agent and 0.6kg of anti-migration agent are weighed, mixed and put into a high-speed mixer, stirred for 30min at the rotating speed of 1000r/min, the materials reach 100 ℃, and the materials are discharged to prepare the modified starch.
Preparation example 10: the present preparation example differs from preparation example 7 in that:
the corn starch is the carrier corn starch prepared in preparation example 1; the tapioca starch is the carrier tapioca starch prepared in preparation example 4.
Preparation example 11: the present preparation example differs from preparation example 10 in that:
the corn starch is the carrier corn starch prepared in preparation example 2; the tapioca starch is the carrier tapioca starch prepared in preparation example 5.
Preparation example 12: the present preparation example differs from preparation example 10 in that:
the corn starch is the carrier corn starch prepared in preparation example 3; the tapioca starch is the carrier tapioca starch prepared in preparation example 6.
Preparation example of Talc powder
Preparation example 13: the talcum powder is prepared by the following method:
weighing 100g of cellulose fibrils, soaking and dispersing the cellulose fibrils in 1000g of methyl silicone oil, wherein the length of the cellulose fibrils is 10 mu m, the diameter of the cellulose fibrils is 5nm, the dispersing and stirring speed is 1000r/min in the soaking process, the stirring time is 15min, filtering the cellulose fibrils, and drying the cellulose fibrils to obtain hydrophobic cellulose fibrils;
weighing 1kg of talcum powder particles, uniformly spraying 0.18kg of propolis liquid on the surfaces of the talcum powder particles to prepare the loaded talcum powder, wherein the particle size of the talcum powder particles is 10 mu m, and the propolis liquid is prepared by heating the propolis liquid to 100 ℃ for softening and hot melting;
uniformly spraying 0.1kg of hydrophobic cellulose fibrils on the surface of 1kg of carrying talcum powder, wherein the spraying speed of the hydrophobic cellulose fibrils is 30g/min, the stirring speed of the carrying talcum powder in the spraying process is 200r/min, and then drying and dispersing are carried out to obtain finished talcum powder; sieving pulvis Talci with 800 mesh sieve.
Preparation example of calcium carbonate
Preparation example 14: the calcium carbonate is prepared by the following method:
weighing 100g of cellulose fibrils, soaking and dispersing the cellulose fibrils in 1000g of methyl silicone oil, wherein the length of the cellulose fibrils is 10 mu m, the diameter of the cellulose fibrils is 5nm, the dispersing and stirring speed is 1000r/min in the soaking process, the stirring time is 15min, filtering the cellulose fibrils, and drying the cellulose fibrils to obtain hydrophobic cellulose fibrils;
weighing 1kg of calcium carbonate particles, mixing and stirring uniformly with 0.2kg of propolis, wherein the particle size of the calcium carbonate particles is 80nm, the propolis is propolis particles with the particle size of 100nm, the adding speed of the propolis is 30g/min, the calcium carbonate particles are stirred at the rotating speed of 80r/min in the adding process, and then the temperature is raised to 100 ℃ and the mixture is stirred for 5s to prepare the carrier calcium carbonate;
uniformly spraying 0.1kg of hydrophobic cellulose fibrils on the surface of 1kg of carrier calcium carbonate, wherein the spraying speed of the hydrophobic cellulose fibrils is 30g/min, the stirring speed of the carrier calcium carbonate in the spraying process is 200r/min, and then drying and dispersing to obtain the finished product calcium carbonate, and the particle size of the finished product calcium carbonate is less than 500nm.
Examples
Sodium polyacrylate in the following raw materials is purchased from Jiangsu Miao biosciences, inc.; polymeric carbodiimide hydrolysis inhibitors are purchased from Shanghai Langmuir functional materials Co., ltd; ethylene bis-stearamide was purchased from kepler biotechnology limited, shandong; the oligomer of styrene-acrylic acid-glycidyl methacrylate is purchased from Qingdao Lini Co., ltd., model CXP5045; other raw materials and equipment are all commonly and commercially available.
Example 1: a fully biodegradable vest bag:
71kg of poly (terephthalic acid-adipic acid-butanediol), 3kg of polylactic acid, 15kg of modified starch, 10kg of inorganic filler, 0.5kg of coagulant, 0.2kg of anti-hydrolysis agent, 0.1kg of chain extender and 0.2kg of lubricant; the weight average molecular weight of the poly (terephthalic acid) -adipic acid-butanediol ester is 5 ten thousand g/mol; the modified starch is the modified starch prepared in preparation example 7; the inorganic filler is calcium carbonate which is common commercial calcium carbonate with the grain diameter of 100nm; the coagulant is sodium polyacrylate; the hydrolysis resistance agent is a polymeric carbodiimide hydrolysis resistance agent; the chain extender is an oligomer of styrene-acrylic acid-glycidyl methacrylate; the lubricant is ethylene bis-stearamide; the preparation method comprises the following steps:
s1, mixing the poly (terephthalic acid) -adipic acid-butanediol ester and the polylactic acid, placing the mixture into a high-speed mixer, and stirring the mixture for 3min at a rotating speed of 3000r/min to obtain a mixture A; continuously stirring modified starch, inorganic filler, coagulant, anti-hydrolysis agent, chain extender and lubricant for 3min to obtain a mixture B;
s2, putting the mixture A into a main feeder, putting the mixture B into a side feeder, extruding and granulating at 160 ℃ of an extruder, wherein the rotating speed of a main machine screw is 250r/min, and after extrusion, sequentially carrying out air cooling, granulating and drying to obtain the film blowing resin; the film blowing resin is placed in a film blowing machine, film blowing processing is carried out at 150 ℃, the rotating speed of a main machine screw is 200r/min, the traction speed is 15m/min, and the blowing ratio is 4, so that a blended film is prepared;
s3, making bags of the blend film by a bag making machine, wherein the bag making temperature is 180 ℃, and the bag thickness is 30 mu m, so that the finished vest bag is obtained.
Example 2: this embodiment differs from embodiment 1 in that:
55kg of poly (terephthalic acid) -adipic acid-butanediol ester, 1kg of polylactic acid, 5kg of modified starch, 5kg of inorganic filler, 0.5kg of coagulant, 0.2kg of anti-hydrolysis agent, 0.1kg of chain extender and 0.1kg of lubricant; the modified starch was the modified starch prepared in preparation example 8.
Example 3: this embodiment differs from embodiment 1 in that:
90kg of poly (terephthalic acid-adipic acid-butanediol), 5kg of polylactic acid, 30kg of modified starch, 30kg of inorganic filler, 1.5kg of coagulant, 0.6kg of anti-hydrolysis agent, 0.3kg of chain extender and 0.5kg of lubricant; the modified starch was the modified starch prepared in preparation example 9.
Example 4: this embodiment differs from embodiment 1 in that:
70kg of poly (terephthalic acid) -adipic acid-butanediol ester, 3kg of polylactic acid, 15kg of modified starch, 18kg of inorganic filler, 1.2kg of coagulant, 0.5kg of anti-hydrolysis agent, 0.2kg of chain extender and 0.3kg of lubricant;
the modified starch is the modified starch prepared in preparation example 10; the inorganic filler consists of talcum powder and calcium carbonate in a weight ratio of 2:1, wherein the talcum powder is prepared in preparation example 13, and the calcium carbonate is prepared in preparation example 14; the coagulant consists of sodium polyacrylate and microcrystalline wax in the weight ratio of 1 to 0.2.
Example 5: this embodiment differs from embodiment 4 in that:
1.1kg of coagulant; the modified starch is the modified starch prepared in preparation example 11; the inorganic filler consists of talcum powder and calcium carbonate in a weight ratio of 2:1, wherein the talcum powder is prepared in preparation example 13, and the calcium carbonate is prepared in preparation example 14; the coagulant consists of sodium polyacrylate and microcrystalline wax in the weight ratio of 1 to 0.1.
Example 6: this embodiment differs from embodiment 4 in that:
1.3kg of coagulant; the modified starch is the modified starch prepared in preparation example 12; the inorganic filler consists of talcum powder and calcium carbonate in a weight ratio of 2:1, wherein the talcum powder is prepared in preparation example 13, and the calcium carbonate is prepared in preparation example 14; the coagulant consists of sodium polyacrylate and microcrystalline wax in the weight ratio of 1 to 0.3.
Example 7: this embodiment differs from embodiment 4 in that:
the carrier corn starch and the carrier tapioca starch are not added with perilla meal powder.
Example 8: this embodiment differs from embodiment 4 in that:
the rhamnolipid solution is replaced by carboxymethyl cellulose solution with the same quality in the carrier corn starch and the carrier tapioca starch.
Example 9: this embodiment differs from embodiment 4 in that:
in the preparation process of talcum powder and calcium carbonate, the surfaces of talcum powder particles and calcium carbonate particles are free of hydrophobic cellulose fibrils.
Example 10: this embodiment differs from embodiment 4 in that:
in the preparation process of talcum powder and calcium carbonate, the same quality of fibril is used for replacing hydrophobic fibril, namely, the cellulose fibril is not treated by methyl silicone oil.
Comparative example
Comparative example 1: this comparative example differs from example 1 in that:
the preparation process of the modified starch comprises the following steps: 75 parts of corn starch and 25 parts of sorbitol are weighed, added into a high-speed mixer and stirred for 15min at the rotating speed of 1000r/min, so as to obtain modified starch.
Comparative example 2: this comparative example differs from example 1 in that:
inorganic filler, an anti-hydrolysis agent and a coagulant are not added into the raw materials.
Performance test
1. Mechanical strength detection
The finished vest bags were prepared by the preparation methods of examples 1-10 and comparative examples 1-2, respectively, and the tensile strength and bag bottom heat seal strength were measured with reference to GB/T1040-2006 and the data recorded.
2. Water resistance detection
The preparation methods of examples 1-10 and comparative examples 1-2 were used to prepare blend films, the blend films were placed at a relative humidity of 90%, a temperature of 30℃for 24 hours, and then a vest bag was prepared, and the tensile strength and the heat-seal strength of the bag bottom after wet treatment were again examined with reference to GB/T1040-2006, and data were recorded.
3. Degradability detection
The preparation methods of examples 1-7 and 9 were used to prepare a finished vest bag, the vest bag was placed in soil with a relative humidity of 70% and a temperature of 20 ℃, and the composting degradation rate after 60 days was recorded, and the data was recorded.
Table 1 performance test table
As can be seen by combining examples 1-3 and Table 1, the vest bag prepared by the method has higher tensile strength and heat-seal strength, and has high degradation speed, and is a film which has low cost, high quality and high heat-seal strength and can be completely biodegraded after being used.
As can be seen from the combination of examples 1 and 4-6 and the combination of table 1, the modified starch, inorganic filler and polymer material can be improved in bonding compatibility after the modified starch, the modified starch and the modified starch are subjected to the modified treatment of the carrier material and matched with talcum powder and calcium carbonate, so that the mechanical strength is improved; after treatment, starch molecules are not easy to absorb water, talcum powder and calcium carbonate are not easy to absorb moisture in a humid environment, so that the plastic film is placed for a period of time to prepare the vest bag, the mechanical property and the heat sealing strength are not easy to influence, and the service life of the vest bag is ensured; meanwhile, after treatment, the degradation efficiency can be accelerated, and the degradation of the vest bag can be promoted.
As can be seen from the combination of examples 4 and examples 7-10 and the combination of table 1, in example 7, the carrier corn starch and the carrier tapioca starch are not added with perilla meal, and compared with example 4, the tensile strength and the heat-seal strength of the vest bag prepared in example 7 are lower than those of example 4, the loss values of the tensile strength and the heat-seal strength after wet treatment are greater than those of example 4, and the degradation rate is lower than that of example 4; the perilla meal powder not only can prevent starch from separating, agglomerating and absorbing water by utilizing the hydrophobicity of the perilla meal powder and ensure the mechanical strength and the heat sealing strength, but also can provide nutrient substances for the growth and propagation of microorganisms and promote the microorganisms to quickly decompose the vest bag.
Example 8 the rhamnolipid solution is replaced by carboxymethyl cellulose solution with the same quality in the corn starch and the tapioca starch, compared with example 4, the tensile strength and the heat-sealing strength of the vest bag prepared in example 8 are lower than those of example 4, and after wet treatment, the loss values of the tensile strength and the heat-sealing strength are larger than those corresponding to example 4; the carboxymethyl cellulose is hydrophilic and absorbs water, and the mechanical strength and the heat sealing strength of the finished vest bag are easily affected due to the moisture absorption after the wet treatment; the hydrophilic end of the rhamnolipid is hydrophobic, the hydrophilic end is convenient to adhere to the surface of starch molecules, and the hydrophobic end outwards adheres to hydrophobic perilla meal powder, so that the good dispersibility of the starch molecules is realized, and the influence of water absorption of the starch molecules on the processing performance of the vest bag is prevented.
In the preparation process of talcum powder and calcium carbonate in example 9, the surfaces of talcum powder particles and calcium carbonate particles are free of hydrophobic cellulose fibrils, compared with example 4, the tensile strength and heat-sealing strength of the vest bag prepared in example 9 are lower than those of example 4, after wet treatment, the loss values of the tensile strength and the heat-sealing strength are larger than those of example 4, and the degradation rate is lower than that of example 4; the addition of the hydrophobic cellulose fibrils can promote the dispersion, promote the growth and propagation of microorganisms and improve the degradation speed; meanwhile, the hot-melting flowing effect in the propolis heat-sealing process is convenient for blocking the pore structure of cellulose fibrils, and the strength of the vest bag is ensured while moisture absorption is prevented by matching with the hydrophobic effect of hydrophobic fiber fibrils.
Example 10 the cellulose fibrils were not treated with methyl silicone oil during the preparation of talc and calcium carbonate and were common commercial cellulose fibrils, and compared with example 4, the tensile strength and heat seal strength of the vest bag prepared in example 10 were lower than those of example 4, and after wet treatment, the loss values of tensile strength and heat seal strength were greater than those corresponding to example 4; it is explained that after the cellulose fibrils are hydrophobic, talcum powder and calcium carbonate can be prevented from absorbing moisture as much as possible, while the non-hydrophobic fibrils are easy to influence the heat sealing strength and the mechanical strength due to the moisture absorption problem.
As can be seen in combination with examples 1 and comparative examples 1-2 and with table 1, comparative example 1 modified starch was mixed with sorbitol alone, and the tensile strength and heat seal strength of the vest bag prepared in comparative example 1 were smaller than those of example 1, and the loss values of tensile strength and heat seal strength after wet treatment were larger than those corresponding to example 1; the corn starch and the tapioca starch modified by the plasticizer, the compatilizer and the anti-migration agent can ensure that the finished vest bag has higher mechanical strength and heat-sealing strength.
The raw materials of the comparative example 2 are not added with inorganic filler, hydrolysis inhibitor and coagulant, compared with the raw materials of the example 1, the tensile strength and heat-sealing strength of the vest bag prepared in the comparative example 2 are smaller than those of the example 1, and the loss values of the tensile strength and the heat-sealing strength after wet treatment are larger than those corresponding to the example 1; the addition of inorganic filler increases the mechanical strength of the vest bag, while the addition of the hydrolysis inhibitor and the coagulant can improve the waterproofness and prolong the service life of the vest bag.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (10)
1. The full-biodegradable vest bag is characterized by comprising the following raw materials in parts by weight: 55-90 parts of poly (terephthalic acid) -adipic acid-butanediol ester, 1-5 parts of polylactic acid, 5-30 parts of modified starch, 5-30 parts of inorganic filler, 0.5-1.5 parts of coagulant, 0.2-0.6 part of hydrolysis resistance agent, 0.1-0.3 part of chain extender and 0.1-0.5 part of lubricant;
the modified starch is a mixture of corn starch and tapioca starch modified by a modifier, and the modifier comprises the following raw materials in parts by weight: 2-12 parts of plasticizer, 0.1-0.3 part of compatilizer, 0.1-1 part of coupling agent and 0.2-0.6 part of anti-migration agent.
2. A fully biodegradable vest bag according to claim 1, in which: the weight ratio of the corn starch to the tapioca starch is 10-90:10-90.
3. The fully biodegradable vest bag according to claim 1, characterized in that the corn starch and the tapioca starch are respectively carrier corn starch and carrier tapioca starch, and the carrier corn starch is composed of corn starch, rhamnolipid solution and perilla meal powder in a weight ratio of 1:0.1-0.3:0.2-0.4; the carrier tapioca starch consists of tapioca starch, rhamnolipid solution and perilla meal powder in a weight ratio of 1:0.1-0.3:0.2-0.4.
4. A fully biodegradable vest bag according to claim 1 in which the inorganic filler is one or more of talc and calcium carbonate.
5. The fully biodegradable vest bag according to claim 4 in which the talc powder is prepared by modifying particles of talc powder with propolis liquid and hydrophobic cellulose fibrils; the calcium carbonate is prepared by modifying calcium carbonate particles through propolis and hydrophobic cellulose fibrils.
6. The fully biodegradable vest bag of claim 5, wherein said hydrophobic cellulose filaments are prepared from cellulose filaments by hydrophobic modification with methyl silicone oil.
7. A fully biodegradable vest bag according to claim 1 in which the coagulant consists of sodium polyacrylate and microcrystalline wax in a weight ratio of 1:0.1-0.3.
8. A fully biodegradable vest bag according to claim 1 in which the chain extender is an oligomer of styrene-acrylic acid-glycidyl methacrylate.
9. A fully biodegradable vest bag according to claim 1 in which the hydrolysis inhibitor is a polymeric carbodiimide hydrolysis inhibitor.
10. A method of making a fully biodegradable vest bag according to any one of claims 1 to 9, comprising the steps of:
s1, uniformly mixing the poly (terephthalic acid) -adipic acid-butanediol ester and the polylactic acid, and then adding modified starch, inorganic filler, coagulant, anti-hydrolysis agent, chain extender and lubricant to uniformly mix to prepare a mixture;
s2, extruding and granulating the mixture to prepare the film blowing resin; the film blowing resin is processed by film blowing to prepare a blend film;
s3, preparing bags from the blend film to obtain the finished vest bag.
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| CN112694722A (en) * | 2020-12-24 | 2021-04-23 | 广州亚俊氏电器有限公司 | Plastic film and plastic bag and preparation method thereof |
| CN113043699A (en) * | 2021-03-23 | 2021-06-29 | 邢台北人印刷有限公司 | Novel biodegradable packaging film for chocolate packaging |
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