CN113845714A - Green environment-friendly packaging bag and production method thereof - Google Patents

Green environment-friendly packaging bag and production method thereof Download PDF

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Publication number
CN113845714A
CN113845714A CN202111381156.5A CN202111381156A CN113845714A CN 113845714 A CN113845714 A CN 113845714A CN 202111381156 A CN202111381156 A CN 202111381156A CN 113845714 A CN113845714 A CN 113845714A
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parts
packaging bag
environment
density polyethylene
friendly packaging
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黄建峰
冯园园
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Zhengzhou Yanfeng Plastic Packaging Co Ltd
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Zhengzhou Yanfeng Plastic Packaging Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2401/02—Cellulose; Modified cellulose
    • C08J2401/04—Oxycellulose; Hydrocellulose
    • 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
    • C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
    • 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
    • C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
    • C08J2405/08—Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/10—Esters; Ether-esters
    • C08K5/11—Esters; Ether-esters of acyclic polycarboxylic acids
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/17—Amines; Quaternary ammonium compounds
    • C08K5/19—Quaternary ammonium compounds
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
    • C08K5/41—Compounds containing sulfur bound to oxygen

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Wrappers (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Bag Frames (AREA)

Abstract

The application relates to the technical field of environment-friendly packaging bags, and particularly discloses an environment-friendly packaging bag and a production method thereof. A green environment-friendly packaging bag is mainly prepared from the following raw materials in parts by weight: 150 parts of low-density polyethylene 120-35 parts, 20-35 parts of high-density polyethylene, 3-7 parts of dibutyl maleate, 30-50 parts of starch, 5-10 parts of microcrystalline cellulose, 5-8 parts of polyhydroxyalkanoate, 2-3.5 parts of a cross-linking agent and 10-20 parts of a reinforcing agent; the reinforcing agent consists of tetrabutylammonium bromide, dimethyl sulfoxide and animal polysaccharide in a mass ratio of (1-2.5) to (0.5-1) to (7-12). The green environment-friendly packaging bag can be used for industrial production and daily life, and has the advantages of high strength, environmental friendliness and degradability.

Description

Green environment-friendly packaging bag and production method thereof
Technical Field
The application relates to the technical field of environment-friendly packaging bags, in particular to an environment-friendly packaging bag and a production method thereof.
Background
The plastic packaging bag is an article widely used in various industries at present, has the advantages of low cost, light weight, easy processing and convenient use, and brings great convenience to the life of people. However, the discarded plastic packaging bags have great influence on the ecological environment, cause serious white pollution and generate great damage to the ecological environment such as soil, rivers, lakes and the like.
In order to reduce the harm caused by plastic packaging bags, technicians develop various degradable environment-friendly packaging bags, for example, a Chinese patent with application publication number of CN107663282A discloses an environment-friendly plastic bag which comprises the following components: modified plant starch, polyvinyl alcohol, cellulose acetate, polylactic acid, acetate starch, nano bentonite, paraffin, a cross-linking agent and a stabilizing agent, and has the advantages of good transparency and degradability. Also, for example, chinese patent application publication No. CN103589182A discloses an environmental protection plastic bag, which contains the following components in parts by weight: the waste regenerated plastic particles, the high-density polyethylene, the linear low-density polyethylene, the starch, the antistatic agent and the defoaming agent are added, so that the raw materials are saved, the production cost is reduced, and the degradable performance is better.
Aiming at the environment-friendly plastic bag, the raw materials are added with additives such as starch, waste and old regenerated plastic particles and the like, so that although the degradable property is ensured to a certain extent and the environment-friendly plastic bag has better environment-friendly characteristic, the additives can have adverse effects on the mechanical property of the plastic bag, and the strength of the plastic bag is insufficient.
Disclosure of Invention
In order to improve the strength of the packaging bag while ensuring the degradability of the packaging bag, the application provides a green environment-friendly packaging bag and a production method thereof.
First aspect, the application provides a green type wrapping bag, adopts following technical scheme:
a green environment-friendly packaging bag is mainly prepared from the following raw materials in parts by weight: 150 parts of low-density polyethylene 120-35 parts, 20-35 parts of high-density polyethylene, 3-7 parts of dibutyl maleate, 30-50 parts of starch, 5-10 parts of microcrystalline cellulose, 5-8 parts of polyhydroxyalkanoate, 2-3.5 parts of a cross-linking agent and 10-20 parts of a reinforcing agent; the reinforcing agent consists of tetrabutylammonium bromide, dimethyl sulfoxide and animal polysaccharide in a mass ratio of (1-2.5) to (0.5-1) to (7-12).
By adopting the technical scheme, the low-density polyethylene and the high-density polyethylene are mixed for use, and dibutyl maleate, starch, microcrystalline cellulose and polyhydroxyalkanoate are added to form a stable and uniform cross-linked structure after melt blending. And the macromolecular chains are displaced and rearranged under the promotion of the cross-linking agent, the toughness of the cross-linked structure is enhanced, and when the high-molecular chains are under the action of external force, the movement between the macromolecular chains can keep up with the application speed of the external force, so that the strength and the elongation at break of the packaging bag are improved. In addition, the animal polysaccharide in the reinforcing agent has good film forming property and biodegradability, and a large number of aldehyde groups and disaccharide structures contained in molecules can be combined with the crosslinking structure to reinforce the strength and the stress stability of the crosslinking structure. And after the dimethyl sulfoxide is added, the strong polarity of the dimethyl sulfoxide can promote the animal polysaccharide to be compatible and move in the cross-linked structure, the dispersion uniformity of the animal polysaccharide is improved, the reaction energy between the cross-linked structure and the animal polysaccharide can be reduced, and molecules are easier to associate. Meanwhile, after tetrabutylammonium bromide is added, the toughness and the mechanical property of a cross-linked structure are further improved by utilizing the macromolecular characteristic and the larger steric hindrance of the tetrabutylammonium bromide, and in the reaction process of combining the animal polysaccharide and the cross-linked structure, the anion and cation pairs generated by self quaternary ammonium cation and bromide ion play a good promoting role, so that the binding force between molecular chains of the cross-linked structure is improved, and the strength and the tensile property of the packaging bag are further improved.
Preferably, the animal polysaccharide is at least two of keratan sulfate, chondroitin sulfate and chitin.
By adopting the technical scheme, the types of the animal polysaccharides are optimized and adjusted, the compatibility of molecules of keratan sulfate, chondroitin sulfate and chitin and a cross-linking structure is better, and the mechanical property of the formed combination is better.
Preferably, the animal is composed of the saccharides keratan sulfate, chondroitin sulfate and chitin according to the mass ratio of (10-18) to (7-15) to (3-8).
By adopting the technical scheme, the composition ratio of the keratan sulfate, the chondroitin sulfate and the chitin is further tested, so that the microstructure of the combined keratan sulfate, chondroitin sulfate and chitin after combination with the cross-linked structure is more uniform, the number of internal defects is small, stress defect points are not easy to generate, and the mechanical property is better.
Preferably, the chondroitin sulfate is subjected to an oxidation treatment.
By adopting the technical scheme, a part of hydroxyl groups on the molecules of the chondroitin sulfate after oxidation treatment are converted into aldehyde groups, the chemical bonding capacity with a cross-linking structure is better, and the formed structure is more stable.
Preferably, the chondroitin sulfate has an oxidation degree of 12-25%.
By adopting the technical scheme, the oxidation degree of the chondroitin sulfate is adjusted and optimized, the bonding speed and the bonding force of the chondroitin sulfate and the cross-linked structure are balanced, and the strength of the packaging bag is further improved.
Preferably, the mass ratio of the low-density polyethylene to the reinforcing agent is (6-15): 1.
By adopting the technical scheme, different proportions of the low-density polyethylene and the reinforcing agent are tested, and when the low-density polyethylene with the mass ratio of (6-15):1 is compounded with the reinforcing agent for use, the mechanical property of the crosslinking structure is better.
Preferably, the raw material also comprises (2-3.5) parts by weight of dioctyl phthalate.
By adopting the technical scheme, after dioctyl phthalate is added into the raw materials, the dispersibility of the raw materials is improved, the toughness of a cross-linked structure is improved, the softness and the ductility of the packaging bag are improved, and the tensile property and the strength are better.
In a second aspect, the application provides a method for producing an environment-friendly packaging bag, which adopts the following technical scheme: a production method of a green environment-friendly packaging bag comprises the following steps:
s1: uniformly mixing dibutyl maleate, starch, microcrystalline cellulose and polyhydroxyalkanoate, and then adding low-density polyethylene, high-density polyethylene, a cross-linking agent and a reinforcing agent to be uniformly mixed to obtain a mixture;
s2: the mixture is melted, blended, extruded and then granulated to prepare master batches;
s3: and blowing the master batch into a film and cutting to obtain the master batch.
By adopting the technical scheme, the dibutyl maleate, the starch, the microcrystalline cellulose and the polyhydroxyalkanoate are premixed to be uniformly mixed with the low-density polyethylene and the high-density polyethylene, meanwhile, the cross-linking agent and the reinforcing agent are added and uniformly mixed to prepare a uniform mixture, then, the uniform mixture is melted and blended to prepare stable and uniform master batches, and finally, the environment-friendly packaging bag with high strength and good tensile property is prepared by film blowing.
Preferably, in step S1, the method further includes the step of adding dioctyl phthalate to the mixture of dibutyl maleate, starch, microcrystalline cellulose and polyhydroxyalkanoate.
By adopting the technical scheme, after the dioctyl phthalate is added, the compatibility and the dispersion uniformity among dibutyl maleate, starch, microcrystalline cellulose and polyhydroxyalkanoate are improved, and the prepared packaging bag has better isotropy.
In summary, the present application has the following beneficial effects:
1. because the raw materials such as low-density polyethylene, high-density polyethylene, starch and the like are adopted for melt blending, and good mechanical properties are obtained under the reinforcing action of tetrabutylammonium bromide, dimethyl sulfoxide and animal polysaccharide in the reinforcing agent, the tensile strength (longitudinal/transverse) can reach 21.3/22.8MPa, the elongation at break can also reach 358.6 percent, and the degradable performance is better.
2. In the application, the compound of keratan sulfate, chondroitin sulfate and chitin is preferably adopted as animal polysaccharide, and the chondroitin sulfate is subjected to oxidation treatment, so that the mechanical property of a cross-linked structure is further improved, and the tensile strength (longitudinal/transverse) of the packaging bag is improved to 28.7/33.9 MPa.
3. The green environment-friendly packaging bag prepared by the production method has high strength and good degradability.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials of the examples and comparative examples of the present application are generally commercially available unless otherwise specified.
Examples
Example 1
The green environment-friendly packaging bag is prepared from the following raw materials in parts by weight: 120kg of low-density polyethylene, 20kg of high-density polyethylene, 3kg of dibutyl maleate, 30kg of starch, 5kg of microcrystalline cellulose, 5kg of polyhydroxyalkanoate, 2kg of a cross-linking agent and 20kg of a reinforcing agent.
Wherein the reinforcing agent consists of tetrabutylammonium bromide, dimethyl sulfoxide and animal polysaccharide in a mass ratio of 1:0.5: 7. The cross-linking agent is dicumyl peroxide. The animal polysaccharide is chitosan.
The production method of the green environment-friendly packaging bag comprises the following steps:
s1: mixing dibutyl maleate, starch, microcrystalline cellulose and polyhydroxyalkanoate with a formula ratio in a mixer at a stirring speed of 300rpm for 15min, then adding low-density polyethylene, high-density polyethylene, a cross-linking agent and a reinforcing agent, heating to 60 ℃, and then mixing at a stirring speed of 200rpm for 20min to obtain a mixture;
s2: melting, blending, extruding and cooling the mixture in a double-screw extruder at the extrusion temperature of 200 ℃, and then granulating to obtain master batches;
s3: and blowing the master batch on a blow molding machine, and then cutting to a proper size to obtain the master batch.
Example 2
The green environment-friendly packaging bag of the embodiment is prepared from the following raw materials in parts by weight: 150kg of low-density polyethylene, 35kg of high-density polyethylene, 7kg of dibutyl maleate, 50kg of starch, 10kg of microcrystalline cellulose, 8kg of polyhydroxyalkanoate, 3.5kg of a cross-linking agent and 10kg of a reinforcing agent.
Wherein the reinforcing agent consists of tetrabutylammonium bromide, dimethyl sulfoxide and animal polysaccharide in a mass ratio of 1:0.5: 7. The cross-linking agent is dicumyl peroxide. The animal polysaccharide is keratan sulfate.
The production method of the green environment-friendly packaging bag comprises the following steps:
s1: mixing dibutyl maleate, starch, microcrystalline cellulose and polyhydroxyalkanoate with a formula ratio in a mixer at a stirring speed of 400rpm for 25min, then adding low-density polyethylene, high-density polyethylene, a cross-linking agent and a reinforcing agent, heating to 70 ℃, and then mixing at a stirring speed of 150rpm for 10min to obtain a mixture;
s2: melting, blending, extruding and cooling the mixture in a double-screw extruder, wherein the extrusion temperature is 170 ℃, and then granulating to obtain master batches;
s3: and blowing the master batch on a blow molding machine, and then cutting to a proper size to obtain the master batch.
Example 3
The green environment-friendly packaging bag is prepared from the following raw materials in parts by weight: 130kg of low-density polyethylene, 25kg of high-density polyethylene, 5kg of dibutyl maleate, 42kg of starch, 8kg of microcrystalline cellulose, 6kg of polyhydroxyalkanoate, 2.8kg of a cross-linking agent and 16kg of a reinforcing agent.
Wherein the reinforcing agent consists of tetrabutylammonium bromide, dimethyl sulfoxide and animal polysaccharide in a mass ratio of 1:0.5: 7. The cross-linking agent is dicumyl peroxide. The animal polysaccharide is hyaluronic acid.
The production method of the green environment-friendly packaging bag comprises the following steps:
s1: mixing dibutyl maleate, starch, microcrystalline cellulose and polyhydroxyalkanoate with a formula ratio in a mixer at a stirring speed of 350rpm for 20min, then adding low-density polyethylene, high-density polyethylene, a cross-linking agent and a reinforcing agent, heating to 80 ℃, and mixing at a stirring speed of 180rpm for 15min to obtain a mixture;
s2: melting, blending, extruding and cooling the mixture in a double-screw extruder, wherein the extrusion temperature is 180 ℃, and then granulating to obtain master batches;
s3: and blowing the master batch on a blow molding machine, and then cutting to a proper size to obtain the master batch.
Example 4
The difference between the green environmental protection type package bag of this embodiment and embodiment 3 is: the reinforcing agent in the raw material consists of tetrabutylammonium bromide, dimethyl sulfoxide and animal polysaccharide according to the mass ratio of 1.8:0.7:9, and the rest is the same as that in the embodiment 3.
The production method of the green environmental protection type packaging bag of the embodiment is the same as that of the embodiment 3.
Example 5
The difference between the green environmental protection type package bag of this embodiment and embodiment 3 is: the reinforcing agent in the raw material consists of tetrabutylammonium bromide, dimethyl sulfoxide and animal polysaccharide according to the mass ratio of 2.5:1:12, and the rest is the same as that in the embodiment 3.
The production method of the green environmental protection type packaging bag of the embodiment is the same as that of the embodiment 3.
Example 6
The difference between the green environmental protection type package bag of this embodiment and embodiment 4 is: the animal polysaccharide in the raw material consists of keratan sulfate and chitin according to the mass ratio of 2:1, and the rest is the same as that in the embodiment 4.
The production method of the green environmental protection type packaging bag of this embodiment is the same as that of embodiment 4.
Example 7
The difference between the green environmental protection type package bag of this embodiment and embodiment 4 is: the animal polysaccharide in the raw material consists of keratan sulfate and chondroitin sulfate according to the mass ratio of 3:2, and the rest is the same as that in the example 4.
The production method of the green environmental protection type packaging bag of this embodiment is the same as that of embodiment 4.
Example 8
The difference between the green environmental protection type package bag of this embodiment and embodiment 4 is: the animal polysaccharide in the raw material consists of keratan sulfate, chondroitin sulfate and chitin according to the mass ratio of 10:7:3, and the rest is the same as that in the embodiment 4.
The production method of the green environmental protection type packaging bag of this embodiment is the same as that of embodiment 4.
Example 9
The difference between the green environmental protection type package bag of this embodiment and embodiment 4 is: the animal polysaccharide in the raw material consists of keratan sulfate, chondroitin sulfate and chitin according to the mass ratio of 18:15:8, and the rest is the same as that in the embodiment 4.
The production method of the green environmental protection type packaging bag of this embodiment is the same as that of embodiment 4.
Example 10
The difference between the green environmental protection type package bag of this embodiment and embodiment 9 is: chondroitin sulfate in the raw material was subjected to oxidation treatment to have an oxidation degree of 12%, and the rest was the same as in example 9.
The method for oxidation treatment of chondroitin sulfate of the present embodiment includes the steps of:
A. dissolving sodium periodate in water to prepare 10 percent of oxidizing solution;
B. adding the oxidizing solution and chondroitin sulfate into a reaction kettle, heating to 60 ℃, carrying out oxidation reaction at a stirring speed of 500rpm, and then washing and drying to obtain the product.
The production method of the green environmental protection type packaging bag of this embodiment is the same as that of embodiment 9.
Example 11
The difference between the green environmental protection type package bag of this embodiment and embodiment 10 is: chondroitin sulfate in the raw material was subjected to oxidation treatment to an oxidation degree of 25%, and the rest was the same as in example 10.
The oxidation treatment method of chondroitin sulfate in this example is the same as that of example 10
The production method of the green environmental protection type packaging bag of this embodiment is the same as that of embodiment 10.
Example 12
The difference between the green environmental protection type package bag of this embodiment and embodiment 11 is: the starting material also included 2.8kg of dioctyl phthalate, the remainder being the same as in example 11.
The oxidation treatment method of chondroitin sulfate in this example is the same as in example 11.
The production method of the green environment-friendly packaging bag comprises the following steps:
s1: dibutyl maleate, starch, microcrystalline cellulose, polyhydroxyalkanoate and dioctyl phthalate with the formula ratio are mixed in a mixer at a stirring speed of 350rpm for 20min, then low-density polyethylene, high-density polyethylene, a crosslinking agent and a reinforcing agent are added, the temperature is increased to 80 ℃, and then the mixture is mixed at a stirring speed of 180rpm for 15min to obtain a mixture;
s2: melting, blending, extruding and cooling the mixture in a double-screw extruder, wherein the extrusion temperature is 180 ℃, and then granulating to obtain master batches;
s3: and blowing the master batch on a blow molding machine, and then cutting to a proper size to obtain the master batch.
Comparative example
Comparative example 1
The green environment-friendly packaging bag of the comparative example is prepared from the following raw materials in parts by weight: 100kg of low-density polyethylene, 50kg of high-density polyethylene, 10kg of dibutyl maleate, 50kg of starch, 15kg of microcrystalline cellulose, 3kg of polyhydroxyalkanoate, 1.5kg of cross-linking agent and 8kg of reinforcing agent.
Wherein the reinforcing agent consists of tetrabutylammonium bromide, dimethyl sulfoxide and animal polysaccharide in a mass ratio of 1:0.5: 7. The cross-linking agent is dicumyl peroxide. The animal polysaccharide is hyaluronic acid.
The production method of the green environmental protection type packaging bag of the comparative example is the same as that of the example 1.
Comparative example 2
The green environment-friendly packaging bag of the comparative example is prepared from the following raw materials in parts by weight: 120kg of low-density polyethylene, 20kg of high-density polyethylene, 3kg of dibutyl maleate, 30kg of starch, 5kg of microcrystalline cellulose, 5kg of polyhydroxyalkanoate, 2kg of a cross-linking agent and 20kg of a reinforcing agent.
Wherein the reinforcing agent consists of tetrabutylammonium bromide and dimethyl sulfoxide according to the mass ratio of 1: 0.5. The cross-linking agent is dicumyl peroxide. The animal polysaccharide is chitosan.
The production method of the green environmental protection type packaging bag of the comparative example is the same as that of the example 1.
Comparative example 3
The green environment-friendly packaging bag of the comparative example is prepared from the following raw materials in parts by weight: 120kg of low-density polyethylene, 20kg of high-density polyethylene, 3kg of dibutyl maleate, 30kg of starch, 5kg of microcrystalline cellulose, 5kg of polyhydroxyalkanoate, 2kg of a cross-linking agent and 20kg of a reinforcing agent.
Wherein the reinforcing agent consists of dimethyl sulfoxide and animal polysaccharide in a mass ratio of 1: 5. The cross-linking agent is dicumyl peroxide. The animal polysaccharide is chitosan.
The production method of the green environmental protection type packaging bag of the comparative example is the same as that of the example 1.
Comparative example 4
The green environment-friendly packaging bag of the comparative example is prepared from the following raw materials in parts by weight: 120kg of low-density polyethylene, 20kg of high-density polyethylene, 3kg of dibutyl maleate, 30kg of starch, 5kg of microcrystalline cellulose, 5kg of polyhydroxyalkanoate, 2kg of a cross-linking agent and 20kg of a reinforcing agent.
Wherein the reinforcing agent is distearoyl isopropoxy aluminate. The cross-linking agent is dicumyl peroxide.
The production method of the green environmental protection type packaging bag of the comparative example is the same as that of the example 1.
Comparative example 5
The green environmental protection type packaging bag of this comparative example is different from example 4 in that: the animal polysaccharide in the raw material consists of keratan sulfate, chondroitin sulfate and chitin according to the mass ratio of 25:6:10, and the rest is the same as that in the embodiment 4.
The production method of the green environmental protection type packaging bag of the comparative example is the same as that of example 4.
Comparative example 6
The green environmental protection type packaging bag of this comparative example is different from example 9 in that: chondroitin sulfate in the raw material was subjected to oxidation treatment to an oxidation degree of 50%, and the rest was the same as in example 9.
The oxidation treatment method of chondroitin sulfate of this comparative example is the same as that of example 9.
The production method of the green environmental protection type packaging bag of this comparative example is the same as that of example 9.
Performance test
Detection method
Taking the green environment-friendly packaging bags of the examples 1-12 and the comparative examples 1-6 to test the mechanical property according to the national standard GB/T1040.3-2018 'determination of plastic tensile property'; in addition, the degradable performance was tested, the green environmental protection type packaging bags of examples 1 to 12 and comparative examples 1 to 6 were buried in soil and placed in a natural environment, the degradation rate after 9 months was tested, and the test results are shown in table 1.
TABLE 1 data of testing green environmental protection type packing bags of examples 1-12 and comparative examples 1-6
Figure BDA0003365601860000081
It can be seen from the analysis of examples 1 to 3 and comparative example 1 in combination with table 1 that, through the tests of different raw material ratios, the mechanical properties of the packaging bag prepared according to the raw material ratio in example 3 are better, and the longitudinal tensile strength can be improved by 40% compared with the packaging bag of comparative example 1.
As can be seen by analyzing examples 4 to 5 and comparative examples 2 to 4 in combination with table 1, the tensile strength (longitudinal strength) of the resulting packaging bag was drastically reduced by 49% compared to the packaging bag of example 4 without adding animal polysaccharides to the raw material of comparative example 2; in the raw material of comparative example 3, tetrabutylammonium bromide was not added, and the tensile strength (longitudinal strength) was reduced by 43% as compared with the packaging bag of example 4, and it can be seen that the animal polysaccharides had a greater influence on the mechanical properties of the packaging bag, and tetrabutylammonium bromide and dimethyl sulfoxide had a promoting and reinforcing effect. Also, as can be seen from comparative example 4, the reinforcing agent of the present application can increase the tensile strength of the packaging bag by 55% as compared with the conventional reinforcing agent.
Analyzing examples 6-7, examples 8-9, comparative example 5 and combining table 1, it can be seen that the tensile strength of the packaging bag is higher when the animal polysaccharide is composed of keratan sulfate, chondroitin sulfate and chitin according to the mass ratio of 18:15:8, and can be improved by 12% compared with the packaging bag in comparative example 5.
Analysis of example 10, example 11, and comparative example 6 in combination with table 1 shows that the compatibility and bonding strength of the chondroitin sulfate after oxidation treatment with the cross-linked structure are higher, and the elongation at break of the packaging bag is improved by 10.8%. And the over-oxidized chondroitin sulfate can cause the reduction of the mechanical property of the packaging bag, and the proper oxidation degree is 25%.
Analysis example 12 and table 1 show that the mechanical properties of the crosslinked structure are further improved after dioctyl phthalate is added to the raw material, the tensile strength (longitudinal/transverse) of the packaging bag can reach 30.2/35.3MPa, and the elongation at break is improved to 411.2%.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (9)

1. The green environment-friendly packaging bag is characterized by being mainly prepared from the following raw materials in parts by weight: 150 parts of low-density polyethylene 120-35 parts, 20-35 parts of high-density polyethylene, 3-7 parts of dibutyl maleate, 30-50 parts of starch, 5-10 parts of microcrystalline cellulose, 5-8 parts of polyhydroxyalkanoate, 2-3.5 parts of a cross-linking agent and 10-20 parts of a reinforcing agent; the reinforcing agent consists of tetrabutylammonium bromide, dimethyl sulfoxide and animal polysaccharide in a mass ratio of (1-2.5) to (0.5-1) to (7-12).
2. The environment-friendly packaging bag as claimed in claim 1, wherein the animal polysaccharides are at least two of keratan sulfate, chondroitin sulfate and chitin.
3. The environment-friendly packaging bag as claimed in claim 2, wherein the animal is composed of a sugar selected from the group consisting of keratan sulfate, chondroitin sulfate and chitin in a mass ratio of (10-18) to (7-15) to (3-8).
4. The packaging bag as claimed in claim 2, wherein the chondroitin sulfate is oxidized.
5. The environment-friendly packaging bag as claimed in claim 4, wherein the chondroitin sulfate has an oxidation degree of 12-25%.
6. The environment-friendly packaging bag as claimed in claim 1, wherein the mass ratio of the low-density polyethylene to the reinforcing agent is (6-15): 1.
7. The environment-friendly packaging bag as claimed in claim 1, wherein the raw material further comprises (2-3.5) parts by weight of dioctyl phthalate.
8. A method for producing an environment-friendly packaging bag as defined in any one of claims 1 to 6, comprising the steps of:
s1: uniformly mixing dibutyl maleate, starch, microcrystalline cellulose and polyhydroxyalkanoate, and then adding low-density polyethylene, high-density polyethylene, a cross-linking agent and a reinforcing agent to be uniformly mixed to obtain a mixture;
s2: the mixture is melted, blended, extruded and then granulated to prepare master batches;
s3: and blowing the master batch into a film and cutting to obtain the master batch.
9. The method for producing green environmental protection type packaging bag according to claim 8, wherein in step S1, the step of mixing dibutyl maleate, starch, microcrystalline cellulose, polyhydroxyalkanoate uniformly further comprises the step of adding dioctyl phthalate.
CN202111381156.5A 2021-11-20 2021-11-20 Green environment-friendly packaging bag and production method thereof Pending CN113845714A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114456556A (en) * 2022-01-13 2022-05-10 珠海麦得发生物科技股份有限公司 Polyhydroxyalkanoate tablet, and preparation method and application thereof

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CN106496762A (en) * 2016-11-23 2017-03-15 广西大学 A kind of Degradable environment-friendlyplastic plastic and preparation method thereof
CN112442221A (en) * 2019-08-29 2021-03-05 徐州金太阳包装材料有限公司 Environment-friendly oxygen-isolating degradable plastic film and preparation method thereof
CN113183190A (en) * 2021-05-19 2021-07-30 孙锐 Bubble bag and preparation process thereof

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Publication number Priority date Publication date Assignee Title
CN106496762A (en) * 2016-11-23 2017-03-15 广西大学 A kind of Degradable environment-friendlyplastic plastic and preparation method thereof
CN112442221A (en) * 2019-08-29 2021-03-05 徐州金太阳包装材料有限公司 Environment-friendly oxygen-isolating degradable plastic film and preparation method thereof
CN113183190A (en) * 2021-05-19 2021-07-30 孙锐 Bubble bag and preparation process thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114456556A (en) * 2022-01-13 2022-05-10 珠海麦得发生物科技股份有限公司 Polyhydroxyalkanoate tablet, and preparation method and application thereof
CN114456556B (en) * 2022-01-13 2023-09-12 珠海麦得发生物科技股份有限公司 Polyhydroxyalkanoate tablet and preparation method and application thereof

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