CN113717452A - Degradable plastic express bag - Google Patents
Degradable plastic express bag Download PDFInfo
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- CN113717452A CN113717452A CN202110812112.7A CN202110812112A CN113717452A CN 113717452 A CN113717452 A CN 113717452A CN 202110812112 A CN202110812112 A CN 202110812112A CN 113717452 A CN113717452 A CN 113717452A
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- Prior art keywords
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- degradable plastic
- density polyethylene
- silicon
- express delivery
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- 229920006238 degradable plastic Polymers 0.000 title claims abstract description 32
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 54
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229920002472 Starch Polymers 0.000 claims abstract description 26
- 239000007822 coupling agent Substances 0.000 claims abstract description 26
- 239000005014 poly(hydroxyalkanoate) Substances 0.000 claims abstract description 26
- 229920000903 polyhydroxyalkanoate Polymers 0.000 claims abstract description 26
- 239000008107 starch Substances 0.000 claims abstract description 26
- 235000019698 starch Nutrition 0.000 claims abstract description 26
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 22
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 22
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 19
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 19
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 18
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 18
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 56
- 239000012065 filter cake Substances 0.000 claims description 26
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 230000032683 aging Effects 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 12
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 11
- 239000002270 dispersing agent Substances 0.000 claims description 11
- 150000001282 organosilanes Chemical class 0.000 claims description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 9
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 8
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 8
- 235000019353 potassium silicate Nutrition 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000001694 spray drying Methods 0.000 claims description 7
- 239000012266 salt solution Substances 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- 235000021355 Stearic acid Nutrition 0.000 claims description 2
- 229940077441 fluorapatite Drugs 0.000 claims description 2
- 229910052587 fluorapatite Inorganic materials 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 claims description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 2
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 239000008117 stearic acid Substances 0.000 claims description 2
- 150000007970 thio esters Chemical class 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 5
- 244000005700 microbiome Species 0.000 abstract description 4
- 238000006065 biodegradation reaction Methods 0.000 abstract description 3
- 238000009395 breeding Methods 0.000 abstract description 2
- 230000001488 breeding effect Effects 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 235000015097 nutrients Nutrition 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 17
- 239000000047 product Substances 0.000 description 11
- 238000002360 preparation method Methods 0.000 description 10
- 238000003756 stirring Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010902 jet-milling Methods 0.000 description 5
- 239000002985 plastic film Substances 0.000 description 5
- 229920006255 plastic film Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000008399 tap water Substances 0.000 description 5
- 235000020679 tap water Nutrition 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 description 3
- 239000004115 Sodium Silicate Substances 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- -1 fatty acid ester Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910052911 sodium silicate Inorganic materials 0.000 description 3
- 239000002585 base Substances 0.000 description 2
- 238000000071 blow moulding Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical group O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- FATBGEAMYMYZAF-KTKRTIGZSA-N oleamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(N)=O FATBGEAMYMYZAF-KTKRTIGZSA-N 0.000 description 2
- FATBGEAMYMYZAF-UHFFFAOYSA-N oleicacidamide-heptaglycolether Natural products CCCCCCCCC=CCCCCCCCC(N)=O FATBGEAMYMYZAF-UHFFFAOYSA-N 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 241000894007 species Species 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001782 photodegradation Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910021426 porous silicon Inorganic materials 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
-
- 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
-
- 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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention discloses a degradable plastic express delivery bag which comprises the following components in parts by weight: 20-50 parts of high-density polyethylene; 10-30 parts of low-density polyethylene; 15-30 parts of starch; 8-15 parts of polyhydroxyalkanoate; 1-5 parts of a silicon-aluminum film opening agent; 1-3 parts of a coupling agent; 0.1-1 part of antioxidant. The invention takes high-density polyethylene and low-density polyethylene as base materials, the base materials, starch, polyhydroxyalkanoate and a coupling agent form a structural framework of the degradable plastic express bag, and a silicon-aluminum film opening agent is added, so that the opening performance and the tensile strength of the express bag can be improved, wherein the starch is a nutrient substance and can provide a breeding place for microorganisms, the structural framework is gradually disintegrated along with the biodegradation of the starch, other substances are gradually degraded by the microorganisms, and the express bag is gradually degraded to avoid environmental pollution.
Description
Technical Field
The invention relates to the technical field of polymers, in particular to a degradable plastic express bag.
Background
With the development of society and the improvement of living standard of people, more and more people select to shop on the internet, and the commodity exchange of people is more and more frequent, so that the logistics industry is rapidly developed. During the transportation process of the articles, the articles need to be packaged by using packaging bags so as to avoid the contamination of the articles. The plastic express bags are used as express bags in a large amount due to the advantages of light weight and low price, but the use of the express bags in a large amount causes increasingly serious white pollution to the environment. The preparation of degradable express delivery bags is a technical problem which needs to be solved at present.
The plastic film of degradable express bag is in production and storage process, and its surface has a large amount of exposed molecular chains after the film shaping, produces macromolecular chain intertwine adhesion after two films are closed, therefore receives the hot pressing or receives the thing pressure condition under, and the adhesion takes place easily for two films. In the subsequent production and use processes, the unwinding speed of the plastic film is slightly influenced, and the plastic film cannot be unfolded for use due to the serious influence, so that the difficulty is brought to the automatic packaging application. In order to solve the problem, in the production process of the plastic film, solid inert particles are added as an opening agent, so that a large number of raised small points are formed on the surfaces of the film and the sheet, and a bridging phenomenon between two layers is formed, so that the problem of adhesion caused by the fact that two inner wall surfaces are attached together is avoided; on the other hand, air is made to penetrate into the inner walls of the two films along the gaps between the small raised points formed on the surfaces of the films/sheets by the opening agent so as to counteract atmospheric pressure, thereby effectively preventing the adhesion between the films.
The initial opening agent is talcum powder, diatomite, etc., and the intermediate stage is developed into oleamide, erucamide EBS derivative, etc. The auxiliary agents have defects in different degrees, and are mainly reflected in poor dispersibility of opening agents such as talcum powder, diatomite and the like; the opening agents such as oleamide and erucamide EBS derivatives are easy to be precipitated on the surface of the film, and influence the printing property and the color of the film.
The current opening agent has been developed into porous silicon-based oxide, the main component of which is silicon dioxide particles, which form a plurality of fine and hard protrusions on the surface of the film, reduce the contact area between the films, so as to reduce the friction between the films and facilitate the separation of the films, and the defects are that the bonding force between the silicon dioxide particles and the film resin is poor, the silicon dioxide particles are not easy to disperse, and the opening performance is affected.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the degradable plastic express delivery bag, the opening agent of the degradable plastic express delivery bag can be uniformly dispersed in the film resin, and the opening agent and the film resin have good affinity and can achieve a better opening effect.
The invention is realized by adopting the following technical scheme:
a degradable plastic express delivery bag comprises the following components in parts by weight:
20-50 parts of high-density polyethylene;
10-30 parts of low-density polyethylene;
15-30 parts of starch;
8-15 parts of polyhydroxyalkanoate;
1-5 parts of a silicon-aluminum film opening agent;
1-3 parts of a coupling agent;
0.1-1 part of antioxidant.
Further, the degradable plastic express delivery bag comprises the following components in parts by weight:
20-40 parts of high-density polyethylene;
15-25 parts of low-density polyethylene;
15-25 parts of starch;
10-15 parts of polyhydroxyalkanoate;
1-5 parts of a silicon-aluminum film opening agent;
1-3 parts of a coupling agent;
0.1-1 part of antioxidant.
Further, the silicon-aluminum film opening agent is prepared by the following steps:
s1: preparing a water glass solution with the silicon dioxide concentration of 10-20 wt% and the modulus of 3.35 for later use;
s2: adding water and aluminum salt into a reaction kettle at the temperature of 30-60 ℃, adding 10-30 wt% sulfuric acid after the aluminum salt is completely dissolved, and adjusting the pH value to 1-3;
s3: simultaneously adding the prepared water glass solution and sulfuric acid into an aluminum salt solution, wherein the parallel flow time is 30-60 min, and the pH value of the system is kept at 1-3;
s4: after the parallel flow is finished, adding sodium hydroxide, adjusting the pH value to 8-10, simultaneously heating to 80-100 ℃, and aging for 2h at the temperature;
s5: after the aging is finished, adding dilute sulfuric acid, adjusting the pH value to 2-4, aging for 0.5-1.5 h, cooling to 60-70 ℃, and filtering to obtain a filter cake;
s6: sequentially washing the filter cake with 1-3 wt% sulfuric acid and water, re-dispersing the washed filter cake in a small amount of water, adding 1-3% of solid content organosilane dispersing agent, and uniformly dispersing to obtain slurry;
s7: spray drying the slurry, and then crushing by air flow to obtain the silicon-aluminum film opening agent with the grain size of 3-7 mu m.
Further, the aluminum salt solution is one or more of aluminum sulfate solution, aluminum nitrate solution and aluminum chloride solution.
Further, the molar ratio of aluminum in the aluminum salt solution to silicon in the water glass is 0.05-0.30: 1.
further, the organosilane dispersing agent is one or more of KH-550, KH-104 and KH-910.
Further, the polyhydroxy fatty acid ester is a mixture of short-chain polyhydroxy fatty acid ester and medium-length polyhydroxy fatty acid ester in a mass ratio of 1: 1-3.
Further, the mass of the silicon-aluminum film opening agent, the high-density polyethylene and the starch is 1: 10-15: 5-8.
Further, the mass ratio of the coupling agent to the high-density polyethylene to the starch to the polyhydroxyalkanoate is 1: 15-20: 5-8: 5.
further, the coupling agent is a silane coupling agent or a stearic acid coupling agent; the antioxidant is one or a combination of several of antioxidant 1010, thioester, fluorapatite and cyanuric acid.
Compared with the prior art, the invention has the beneficial effects that:
the silicon-aluminum film opening agent provided by the invention can be uniformly dispersed in a plastic film, and by adding aluminum species, on one hand, the bulk ratio of the obtained opening agent can be regulated, and simultaneously, the surface defects of opening agent particles are increased, so that the opening agent particles and an organosilane dispersing agent have better combination, the affinity degree of the obtained opening agent particles and film resin is improved, the antistatic property, the lubricating property and the moisture resistance of the opening agent particles are improved, the friction coefficient and the bonding resistance are reduced, and a better opening effect is achieved.
The invention takes high-density polyethylene and low-density polyethylene as base materials, the base materials, starch, polyhydroxyalkanoate and a coupling agent form a structural framework of the degradable plastic express bag, and a silicon-aluminum film opening agent is added, so that the opening performance and the tensile strength of the express bag can be improved, wherein the starch is a nutrient substance and can provide a breeding place for microorganisms, the structural framework is gradually disintegrated along with the biodegradation of the starch, other substances are gradually degraded by the microorganisms, and the express bag is gradually degraded to avoid environmental pollution.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
The invention provides a degradable plastic express delivery bag which comprises the following components in parts by weight:
20-50 parts of high-density polyethylene; 10-30 parts of low-density polyethylene; 15-30 parts of starch; 8-15 parts of polyhydroxyalkanoate; 1-5 parts of a silicon-aluminum film opening agent; 1-3 parts of a coupling agent; 0.1-1 part of antioxidant.
By adding aluminum species into the silicon-aluminum film opening agent, on one hand, the bulk ratio of the obtained opening agent can be regulated, and simultaneously, the surface defects of opening agent particles are increased, so that the opening agent particles are better combined with an organosilane dispersing agent, the affinity degree of the obtained opening agent particles and film resin is improved, the antistatic property, the lubricating property and the moisture-proof property of the opening agent particles are improved, the friction coefficient and the bonding resistance are reduced, and a better opening effect is achieved.
The preparation method of the degradable plastic express delivery bag comprises the following steps: at normal temperature, putting high-density polyethylene, low-density polyethylene, starch, polyhydroxyalkanoate and a coupling agent into a stirrer, uniformly stirring, adding a silicon-aluminum film opening agent and an antioxidant, continuously stirring until the materials are uniformly mixed to obtain a mixture, then extruding and granulating the mixture on a double-screw extruder, and finally carrying out melt extrusion and blow molding to obtain the express bag.
The coupling agent in the following embodiments is vinyltrimethoxysilane coupling agent, the antioxidant is antioxidant 1010, the polyhydroxyalkanoate is a mixture of short-chain polyhydroxyalkanoate and medium-length polyhydroxyalkanoate with the mass ratio of 1:1, and raw materials, equipment and the like used in the following examples can be obtained by purchase except for special limitations.
Example 1:
a degradable plastic express delivery bag comprises the following components in parts by weight:
40 parts of high-density polyethylene; 15 parts of low-density polyethylene; 15 parts of starch; 10 parts of polyhydroxyalkanoate; 3 parts of a silicon-aluminum film opening agent; 2 parts of a coupling agent; 0.1 part of antioxidant.
The silicon-aluminum film opening agent is prepared by the following method:
50L of bottom water and 45 moles of aluminum sulfate are injected into a stirring reaction vessel at the temperature of 30 ℃, after the aluminum sulfate is completely dissolved, 30 wt% of sulfuric acid is added to adjust the pH value of the system to be 2, 20 wt% of sodium silicate 75L and 30 wt% of sulfuric acid are added in a concurrent flow manner, the pH value of the system is kept to be 2, and the concurrent flow time is 30 minutes.
After the completion of the parallel flow, the temperature was adjusted to 90 ℃, the pH was adjusted to 9 with sodium hydroxide, and aging was carried out for 2 hours. After the aging is finished, adding sulfuric acid to adjust the pH value to 3, aging for 0.5 hour, then cooling to 60 ℃, and filtering to obtain a filter cake. Washing the filter cake with 1 wt% sulfuric acid, washing with tap water and pure water, and press filtering to obtain the filter cake. The filter cake was redispersed in a small amount of water and 3% solids content of organosilane dispersant KH550 was added. And after uniform dispersion, spray drying the obtained slurry, and performing jet milling to obtain a product with the particle size of 3-7 microns. The physical and chemical properties of seven parallel products of the silicon-aluminum film opening agent are shown in a table I:
watch 1
The preparation method of the degradable plastic express delivery bag comprises the following steps: at normal temperature, putting high-density polyethylene, low-density polyethylene, starch, polyhydroxyalkanoate and a coupling agent into a stirrer, uniformly stirring, adding a silicon-aluminum film opening agent and an antioxidant, continuously stirring until the materials are uniformly mixed to obtain a mixture, then extruding and granulating the mixture on a double-screw extruder, and finally carrying out melt extrusion and blow molding to obtain the express bag.
Example 2:
a degradable plastic express delivery bag comprises the following components in parts by weight:
40 parts of high-density polyethylene; 15 parts of low-density polyethylene; 15 parts of starch; 10 parts of polyhydroxyalkanoate; 3 parts of a silicon-aluminum film opening agent; 2 parts of a coupling agent; 0.1 part of antioxidant.
The silicon-aluminum film opening agent is prepared by the following method:
50L of bottom water and 15 moles of aluminum nitrate are injected into a stirring reaction vessel at the temperature of 60 ℃, after the aluminum nitrate is completely dissolved, 10 wt% of sulfuric acid is added to adjust the pH value of the system to be 2, 75L of water glass with the concentration of 20 wt% and 10 wt% of sulfuric acid are added in a concurrent mode, the pH value of the system is kept to be 2, and the concurrent flow time is 90 minutes. After the completion of the parallel flow, the temperature was adjusted to 100 ℃, the pH was adjusted to 10 with sodium hydroxide, and aging was carried out for 2 hours. After the aging is finished, adding sulfuric acid to adjust the pH value to 2, aging for 1.5 hours, then cooling to 60 ℃, and filtering to obtain a filter cake. Washing the filter cake with 3 wt% sulfuric acid, washing with tap water and pure water, and press filtering to obtain the filter cake. The filter cake was redispersed in a small amount of water and the organosilane dispersant KH550 was added at 1% solids content. And after uniform dispersion, spray drying the obtained slurry, and performing jet milling to obtain a product with the particle size of 3-7 microns. The physicochemical properties of seven parallel products of the silicon-aluminum film opening agent are shown in the table II:
watch two
The preparation method is the same as that of example 1.
Example 3:
a degradable plastic express delivery bag comprises the following components in parts by weight:
40 parts of high-density polyethylene; 15 parts of low-density polyethylene; 15 parts of starch; 10 parts of polyhydroxyalkanoate; 3 parts of a silicon-aluminum film opening agent; 2 parts of a coupling agent; 0.1 part of antioxidant.
The silicon-aluminum film opening agent is prepared by the following method:
50L of bottom water and 30 moles of aluminum chloride are injected into a stirring reaction vessel at the temperature of 40 ℃, sulfuric acid with the concentration of 30 wt% is added after the aluminum chloride is completely dissolved to adjust the pH value of the system to be 2, 75L of water glass with the concentration of 10 wt% and 30 wt% of sulfuric acid are added in a concurrent mode, the pH value of the system is kept to be 2, and the concurrent flow time is 60 minutes. After the completion of the parallel flow, the temperature was adjusted to 80 ℃, the pH was adjusted to 8 with sodium hydroxide, and aging was carried out for 2 hours. After the aging is finished, adding sulfuric acid to adjust the pH value to be 4, aging for 1 hour, then cooling to 70 ℃, and filtering to obtain a filter cake. Washing the filter cake with 1 wt% sulfuric acid, washing with tap water and pure water, and press filtering to obtain the filter cake. The filter cake was redispersed in a small amount of water and the organosilane dispersant KH104 was added at 2% solids content. And after uniform dispersion, spray drying the obtained slurry, and performing jet milling to obtain a product with the particle size of 3-7 microns. The physicochemical properties of seven parallel products of the silicon-aluminum film opening agent are shown in the third table:
watch III
The preparation method is the same as that of example 1.
Example 4:
a degradable plastic express delivery bag comprises the following components in parts by weight:
40 parts of high-density polyethylene; 15 parts of low-density polyethylene; 15 parts of starch; 10 parts of polyhydroxyalkanoate; 3 parts of a silicon-aluminum film opening agent; 2 parts of a coupling agent; 0.1 part of antioxidant.
The silicon-aluminum film opening agent is prepared by the following method:
50L of bottom water and 15 moles of aluminum sulfate are injected into a stirring reaction vessel at the temperature of 30 ℃, after the aluminum sulfate is completely dissolved, 30 wt% of sulfuric acid is added to adjust the pH value of the system to be 2, 20 wt% of sodium silicate 75L and 30 wt% of sulfuric acid are added in a concurrent flow manner, the pH value of the system is kept to be 2, and the concurrent flow time is 30 minutes. After the completion of the parallel flow, the temperature was adjusted to 90 ℃, the pH was adjusted to 9 with sodium hydroxide, and aging was carried out for 2 hours. After the aging is finished, adding sulfuric acid to adjust the pH value to 3, aging for 0.5 hour, then cooling to 60 ℃, and filtering to obtain a filter cake. Washing the filter cake with 1 wt% sulfuric acid, washing with tap water and pure water, and press filtering to obtain the filter cake. The filter cake was redispersed in a small amount of water and 2% solids content of organosilane dispersant KH910 was added. And after uniform dispersion, spray drying the obtained slurry, and performing jet milling to obtain a product with the particle size of 3-7 microns. The physicochemical properties of seven parallel products of the silicon-aluminum film opening agent are shown in the fourth table:
watch four
The preparation method is the same as that of example 1.
Example 5:
a degradable plastic express delivery bag comprises the following components in parts by weight:
40 parts of high-density polyethylene; 15 parts of low-density polyethylene; 15 parts of starch; 10 parts of polyhydroxyalkanoate; 3 parts of a silicon-aluminum film opening agent; 2 parts of a coupling agent; 0.1 part of antioxidant.
The silicon-aluminum film opening agent is prepared by the following method:
under the condition of 30 ℃ of temperature, 50L of bottom water and 30 moles of aluminum sulfate are injected into a stirring reaction vessel, after the aluminum sulfate is completely dissolved, 30 wt% of sulfuric acid is added to adjust the pH value of the system to be 2, 20 wt% of sodium silicate 75L and 30 wt% of sulfuric acid are added in a concurrent flow mode, the pH value of the system is kept to be 2, and the concurrent flow time is 30 minutes. After the completion of the parallel flow, the temperature was adjusted to 90 ℃, the pH was adjusted to 9 with sodium hydroxide, and aging was carried out for 2 hours. After the aging is finished, adding sulfuric acid to adjust the pH value to 3, aging for 0.5 hour, then cooling to 60 ℃, and filtering to obtain a filter cake. Washing the filter cake with 1 wt% sulfuric acid, washing with tap water and pure water, and press filtering to obtain the filter cake. The filter cake was redispersed in a small amount of water and 2% solids content of the organosilane dispersant KH550 was added. And after uniform dispersion, spray drying the obtained slurry, and performing jet milling to obtain a product with the particle size of 3-7 microns. The physicochemical properties of seven parallel products of the silicon-aluminum film opening agent are shown in the table five:
watch five
The preparation method is the same as that of example 1.
In the above embodiments, each material is not limited to the above components, and each material may also be composed of other single components or multiple components described in the present invention, and the component parts of each material are not limited to the above parts, and the component parts of each material may also be a combination of other component parts described in the present invention, and are not described herein again.
Comparative example 1
A degradable plastic express delivery bag comprises the following components in parts by weight:
40 parts of high-density polyethylene; 15 parts of low-density polyethylene; 15 parts of starch; 10 parts of polyhydroxyalkanoate; 3 parts of a silicon-aluminum film opening agent; 2 parts of a coupling agent; 0.1 part of antioxidant.
The operation of the silicon-aluminum film opening agent was the same as in example 1 except that no aluminum salt was added. The physicochemical properties of seven parallel products of the silicon-aluminum film opening agent are shown in the sixth table:
watch six
The preparation method is the same as that of example 1.
Comparative example 2
A degradable plastic express delivery bag comprises the following components in parts by weight:
40 parts of high-density polyethylene; 15 parts of low-density polyethylene; 15 parts of starch; 10 parts of polyhydroxyalkanoate; 2 parts of a coupling agent; 0.1 part of antioxidant.
The preparation method is the same as that of example 1.
Comparative example 3
A degradable plastic express delivery bag comprises the following components in parts by weight:
40 parts of high-density polyethylene; 15 parts of low-density polyethylene; 15 parts of starch; 10 parts of polyhydroxyalkanoate; 3 parts of erucamide; 2 parts of a coupling agent; 0.1 part of antioxidant.
The preparation method is the same as that of example 1.
Performance testing and Effect evaluation
The performance of the express bags obtained in examples 1-5 and the express bags obtained in comparative examples 1-3 will be tested, and degradation observed by exposing the express bags to soil naturally to observe their degradation changes, if as shown in table seven below.
Watch seven
Through the comparative analysis, the express bag prepared from the degradable plastic express bag material has good tensile strength and good openness, and after the express bag is naturally exposed in soil for 30 days, the express bag has more than 55% of area with obvious cracks, which shows that the express bag material has good composite effects of photodegradation and biodegradation under the action of biological erosion and illumination.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. The degradable plastic express delivery bag is characterized by comprising the following components in parts by weight:
20-50 parts of high-density polyethylene;
10-30 parts of low-density polyethylene;
15-30 parts of starch;
8-15 parts of polyhydroxyalkanoate;
1-5 parts of a silicon-aluminum film opening agent;
1-3 parts of a coupling agent;
0.1-1 part of antioxidant.
2. The degradable plastic express delivery bag of claim 1, comprising the following components in parts by weight:
20-40 parts of high-density polyethylene;
15-25 parts of low-density polyethylene;
15-25 parts of starch;
10-15 parts of polyhydroxyalkanoate;
1-5 parts of a silicon-aluminum film opening agent;
1-3 parts of a coupling agent;
0.1-1 part of antioxidant.
3. The degradable plastic express delivery bag of claim 1, wherein the silicon-aluminum film opening agent is prepared by:
s1: preparing a water glass solution with the silicon dioxide concentration of 10-20 wt% and the modulus of 3.35 for later use;
s2: adding water and aluminum salt into a reaction kettle at the temperature of 30-60 ℃, adding 10-30 wt% sulfuric acid after the aluminum salt is completely dissolved, and adjusting the pH value to 1-3;
s3: simultaneously adding the prepared water glass solution and sulfuric acid into an aluminum salt solution, wherein the parallel flow time is 30-60 min, and the pH value of the system is kept at 1-3;
s4: after the parallel flow is finished, adding sodium hydroxide, adjusting the pH value to 8-10, simultaneously heating to 80-100 ℃, and aging for 2h at the temperature;
s5: after the aging is finished, adding dilute sulfuric acid, adjusting the pH value to 2-4, aging for 0.5-1.5 h, cooling to 60-70 ℃, and filtering to obtain a filter cake;
s6: sequentially washing the filter cake with 1-3 wt% sulfuric acid and water, re-dispersing the washed filter cake in a small amount of water, adding 1-3% of solid content organosilane dispersing agent, and uniformly dispersing to obtain slurry;
s7: spray drying the slurry, and then crushing by air flow to obtain the silicon-aluminum film opening agent with the grain size of 3-7 mu m.
4. The degradable plastic express delivery bag of claim 3 wherein the aluminum salt solution is one or more of a combination of an aluminum sulfate solution, an aluminum nitrate solution, and an aluminum chloride solution.
5. The degradable plastic express delivery bag of claim 3, wherein the molar ratio of aluminum in the aluminum salt solution to silicon in the water glass is 0.05-0.30: 1.
6. the degradable plastic express delivery bag of claim 3, wherein the organosilane dispersant is one or more combinations of KH-550, KH-104, KH-910.
7. The degradable plastic express delivery bag of claim 1, wherein the polyhydroxyalkanoate is a mixture of short-chain polyhydroxyalkanoate and medium-length polyhydroxyalkanoate in a mass ratio of 1: 1-3.
8. The degradable plastic express delivery bag of claim 1, wherein the silicon-aluminum film opening agent, the high-density polyethylene and the starch are mixed in a mass ratio of 1: 10-15: 5-8.
9. The degradable plastic express delivery bag of claim 1, wherein the mass ratio of the coupling agent to the high density polyethylene to the starch to the polyhydroxyalkanoate is 1: 15-20: 5-8: 5.
10. the degradable plastic express delivery bag of claim 1, wherein the coupling agent is a silane coupling agent or a stearic acid coupling agent; the antioxidant is one or a combination of several of antioxidant 1010, thioester, fluorapatite and cyanuric acid.
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