CN110612846A - Bio-based fully-degradable insect-proof mulching film - Google Patents

Bio-based fully-degradable insect-proof mulching film Download PDF

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Publication number
CN110612846A
CN110612846A CN201910479312.8A CN201910479312A CN110612846A CN 110612846 A CN110612846 A CN 110612846A CN 201910479312 A CN201910479312 A CN 201910479312A CN 110612846 A CN110612846 A CN 110612846A
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layer
additive
resin
bio
degradation
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张建华
张博
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TIANJIN JIANNA WOTE PLASTICIZATION TECHNOLOGY Co Ltd
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TIANJIN JIANNA WOTE PLASTICIZATION TECHNOLOGY Co Ltd
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G13/00—Protecting plants
    • A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
    • A01G13/0256—Ground coverings
    • A01G13/0268—Mats or sheets, e.g. nets or fabrics
    • A01G13/0275—Films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/716—Degradable
    • B32B2307/7163—Biodegradable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2410/00—Agriculture-related articles
    • 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
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2296—Oxides; Hydroxides of metals of zinc
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Laminated Bodies (AREA)
  • Biological Depolymerization Polymers (AREA)

Abstract

The invention belongs to the technical field of bio-based degradation, and particularly relates to a bio-based fully-degradable insect-proof mulching film which comprises a surface layer, a middle layer and an inner layer; the surface layer comprises a surface resin layer and a surface additive layer, the surface additive layer is positioned below the surface resin layer, the surface resin layer is modified polyvinyl alcohol resin, and the surface additive layer is an oxidative light degradation additive; the middle layer comprises a middle layer resin layer and a middle layer additive layer, the middle layer additive layer is positioned below the middle layer resin layer, the middle layer resin layer is modified polylactic acid resin, and the middle layer additive layer is an oxidative thermal degradation additive; the inner layer comprises an inner layer resin layer and an inner layer additive layer, the inner layer additive layer is positioned below the inner layer resin layer, the inner layer resin layer is modified polyhydroxyalkanoate resin, and the inner layer additive layer is an oxidative biodegradation additive.

Description

Bio-based fully-degradable insect-proof mulching film
Technical Field
The invention belongs to the technical field of bio-based degradation, and particularly relates to a bio-based fully-degradable insect-proof mulching film.
Background
With the rapid development of economy, people are increasingly seriously damaged to the environment, and particularly, non-degradable plastics are not easily degraded by soil microorganisms and are stored in the soil for a long time after being randomly thrown by people, so that the ecological environment is seriously polluted. Disposable tableware, disposable plastic products, agricultural mulching films and the like are difficult to recycle, and the traditional treatment method mainly comprises incineration and burying. A large amount of harmful gas is generated by burning, so that the environment is polluted; if buried, the polymer in the buried polymer cannot be decomposed by microorganisms in a short time, and the environment is polluted. The residual plastic film exists in the soil, which hinders the development of crop roots and the absorption of water and nutrients, so that the air permeability of the soil is reduced, and the yield of crops is reduced; after the residual plastic film is eaten in action, intestinal obstruction is caused and the patient dies; synthetic fiber fishing nets and fishing lines lost to or discarded in the ocean have caused considerable damage to marine life, and thus it is imperative to promote green consumption and enhance environmental protection.
In order to reduce white pollution and protect the ecological environment, people begin to research degradable plastics, the first-generation degradable plastics researched is degradable plastics, and a small part of degradable master batch or starch-based raw materials are added on the basis of the original raw materials, and the majority of the degradable plastics cannot be degraded and are not beneficial to the recovery and reconstruction of the plastics; the second generation of degraded plastics researched is bio-based controllable full-degradable plastics, biomass which is rich in resources and renewable is used as a raw material, the degradation process is green and clean, the benign cycle of a land and environment system is also facilitated to be constructed, and the method is an effective way for relieving the petroleum crisis and eliminating white pollution.
At present, the bio-based fully-degradable insect-proof mulching film applied in practice has the advantages of simple structure, incomplete degradation and poor implementation effect.
Disclosure of Invention
The invention provides a bio-based fully-degradable insect-proof mulching film, which aims to solve the problems of simple structure and incomplete degradation in the background technology.
The technical problem solved by the invention is realized by adopting the following technical scheme:
a bio-based full-degradable insect-proof mulching film comprises a surface layer, a middle layer and an inner layer;
the surface layer comprises a surface resin layer and a surface additive layer, the surface additive layer is positioned below the surface resin layer, the surface resin layer is modified polyvinyl alcohol resin, and the surface additive layer is an oxidative light degradation additive;
the middle layer comprises a middle layer resin layer and a middle layer additive layer, the middle layer additive layer is positioned below the middle layer resin layer, the middle layer resin layer is modified polylactic acid resin, and the middle layer additive layer is an oxidative thermal degradation additive;
the inner layer comprises an inner layer resin layer and an inner layer additive layer, the inner layer additive layer is positioned below the inner layer resin layer, the inner layer resin layer is modified polyhydroxyalkanoate resin, and the inner layer additive layer is an oxidative biodegradation additive.
The thickness percentage of the surface layer is 15%, the thickness percentage of the middle layer is 70%, and the thickness percentage of the inner layer is 15%.
The thickness percentage of the surface resin layer is 85 percent, and the thickness percentage of the surface additive layer is 15 percent.
The thickness percentage of the middle layer resin layer is 90%, and the thickness percentage of the middle layer additive layer is 10%.
The thickness percentage of the inner resin layer is 95%, and the thickness percentage of the inner additive layer is 5%.
The oxidative photodegradation additive, the oxidative thermal degradation additive and the oxidative biodegradation additive are all nano zinc oxide.
The invention has the beneficial effects that:
the mulching film prepared by the technical scheme can realize complete degradation, has ideal implementation effect,
the concrete component effects are as follows:
1 modified polyvinyl alcohol resin: is the modification of polyvinyl alcohol resin, the modified polyvinyl alcohol resin has two functional groups of hydrophilic group and hydrophobic group, and can be completely degraded into CO by utilizing the film-forming property of PVA and the degradation characteristics of water and biology2And H2O is a genuine green high-new environment-friendly fully-degradable packaging material; the modified polyvinyl alcohol is a degradable novel barrier material which is comparable to three barrier materials of PVDC, EVOH and PA and has oxygen barrier property (5-10) cc/24h/m2Water vapor barrier property (50-100) cc/24h/m2(ii) a The modified polyvinyl alcohol is a high molecular polymer, and is white or slightly yellow granular or powdery solid in appearance; the modified polyvinyl alcohol is water-soluble resin, and has the characteristics of good chemical stability, cohesiveness, film-forming property, insulativity, oil resistance, wear resistance, gas barrier property and the like; the modified polyvinyl alcohol is a controllable barrier degradation material, can control barrier degradation time according to the storage period of an article, and is mainly used for manufacturing various food packaging, medical packaging, household appliance packaging and other degradation films.
2 modified polylactic resin: the polylactic acid resin is modified, belongs to a polyester family, is a polymer obtained by polymerizing lactic acid serving as a main raw material, is sufficient in raw material source and can be regenerated, is crisp and poor in flexibility, and solves the problem of brittleness of the polylactic acid through modification, so that the flexibility is improved; the modified polylactic resin is a novel biodegradable material, has good safety and compatibility, is similar to the basic physical properties of petrochemical synthetic plastics, has good mechanical properties and physical properties, and has the best tensile strength and extensibility; the improved polylactic resin has the unique characteristics of high strength and transparency, strong resistance to climate change and odor isolation; the improved polylactic resin is mainly used for manufacturing various biodegradable packaging products such as agricultural mulching films, shopping bags, vest bags, garbage bags, commodity bags, controllable degradation barrier bags and the like.
3 modified polyhydroxyalkanoate resin: the polyhydroxyalkanoate resin is an intracellular polyester synthesized by various bacteria, is an important non-petroleum-based high polymer material, has complete degradation performance, has the defect of high cost, and reduces the cost due to the modified polyhydroxyalkanoate resin; the modified polyhydroxyalkanoate resin has biocompatibility, biodegradability, piezoelectricity and good use and processing performance, and the basic performance is similar to that of petroleum-based resin; the modified polyhydroxyalkanoate resin can be blended with other degradable materials on the basis of PHA according to different applications; the modified polyhydroxyalkanoate resin is mainly used in agricultural mulching film markets, daily-use department goods supermarkets, food and meat cold chain markets, vegetable and fruit storage and transportation markets and the like.
4, adding a degradation additive in a raw material modification production process in a ratio to change various modified resins into modified resin raw materials with controllable degradation, and adding the degradation additive in a degradation product production process to change various non-degradable plastic products into controllable completely degradable plastic products; the degradation additive is added into the resin in the production process of the plastic product, production equipment and procedures do not need to be changed, the degradation plastic product added with the degradation additive can be degraded when being exposed to sunlight, high temperature or external force, and the degradation time and speed are controllable; the degradation additive is nontoxic, can be contacted with edible objects, has strong processability, can be compatible with most materials, can control the degradability, can control the degradation time according to the required requirements, has 100 percent of environmental degradability, can be completely converted into water, carbon dioxide and organic matters, can not be harmful to the environment or soil, has high cost performance, and has lower cost compared with other degradation technologies; the degradation additive is mainly used in garbage disposal system, packaging industry, agriculture, compost and plastic manufacturing industry, and is suitable for manufacturing various degradation plastic products, such as agricultural mulching films, drip irrigation belts, shopping bags, vest bags, garbage bags, express bags, snack boxes and the like.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1-surface layer, 2-middle layer, 3-inner layer, 4-surface resin layer, 5-surface additive layer, 6-middle resin layer, 7-middle additive layer, 8-inner resin layer and 9-inner additive layer.
Detailed Description
A bio-based full-degradable insect-proof mulching film comprises a surface layer, a middle layer and an inner layer;
the surface layer comprises a surface resin layer and a surface additive layer, the surface additive layer is positioned below the surface resin layer, the surface resin layer is modified polyvinyl alcohol resin, and the surface additive layer is an oxidative light degradation additive;
the middle layer comprises a middle layer resin layer and a middle layer additive layer, the middle layer additive layer is positioned below the middle layer resin layer, the middle layer resin layer is modified polylactic acid resin, and the middle layer additive layer is an oxidative thermal degradation additive;
the inner layer comprises an inner layer resin layer and an inner layer additive layer, the inner layer additive layer is positioned below the inner layer resin layer, the inner layer resin layer is modified polyhydroxyalkanoate resin, and the inner layer additive layer is an oxidative biodegradation additive.
The thickness percentage of the surface layer is 15%, the thickness percentage of the middle layer is 70%, and the thickness percentage of the inner layer is 15%.
The thickness percentage of the surface resin layer is 85 percent, and the thickness percentage of the surface additive layer is 15 percent.
The thickness percentage of the middle layer resin layer is 90%, and the thickness percentage of the middle layer additive layer is 10%.
The thickness percentage of the inner resin layer is 95%, and the thickness percentage of the inner additive layer is 5%.
The oxidative photodegradation additive, the oxidative thermal degradation additive and the oxidative biodegradation additive are all nano zinc oxide.
The technical scheme adopts a binary process forming technology, which means that a forming process is added on the basis of unitary process forming (formula process), the unitary formula process only occupies 50% of technical content in the production process of a product, and the basic technical guarantee of the product can be perfected by the binary forming process, mainly embodying the thinning and thickening of the product, thinning and reinforcing, effectively reducing the cost and improving the market share.
The binary process forming technology comprises the following steps: a unitary formula process and a binary forming process.
The unitary formula process comprises the following steps:
1, a formula process of an oxygen-containing polyolefin controllable degradation material;
2, oxidizing the biological controllable degradation material formula process;
3PVA biological-based controllable degradation material formula process;
4PBAT bio-based controllable degradation material formula process;
5, a triple controllable degradation technology formula process;
6 fourfold controllable degradation technology formula process;
7 quintuple controllable degradation technology formula process;
8, a formula process of a sextuple controllable degradation technology;
9 three-layer water-retention type controllable degradation technology formula process.
The binary forming process comprises the following steps:
1, vacuum sizing forming process;
2, an intelligent weighing system forming process;
3, controlling materials between layers to intelligently control a forming process;
4, intelligently controlling a thickness forming process;
5 intelligently controlling the width forming process;
6, intelligent deviation rectifying and forming process;
7, a two-bubble forming process;
8, forming by a three-bubble method;
9, forming by a four-bubble method;
10 automatic rolling and forming process of intelligent manipulator.
The principle is as follows:
the bio-based controllable fully degradable plastics can be classified into starch, polyester and other types according to raw materials;
starch is a natural high molecular material with rich source and low priceHowever, starch exists in the form of small particles having a crystalline structure inside, and its molecular structure includes both linear and branched chains. The morphology and size of the starch granules and the ratio of amylose to amylopectin content vary from plant species to plant species. The grain size of the starch grains is 15-100 mu m. Amylose glucose is a chain compound having alpha-D-1, 4 glycosidic bonds and having a relative molecular mass of (20-200) x104. The connection mode of each glucose unit in the amylopectin is that besides alpha-D-1, 4 glycosidic bonds, alpha-D-1, 6 glycosidic bonds exist, and the relative molecular mass is (100-6. The properties of starch are related to the relative molecular mass of the starch, the length of the amylopectin, and the ratio of amylose to amylopectin. The high amylose starch is more suitable for the preparation of plastics and the resulting products have better mechanical properties. Natural starch has hydrogen bonds among molecules, has poor solubility, is hydrophilic but not easily soluble in water, and has a strong polar crystalline property. Because of the strong hydrogen bonding between macromolecules of natural starch, the natural starch is difficult to directly process and form. In order to improve the processing property, the method is generally realized by opening hydrogen bonds among starch chains to ensure that the starch loses crystallization. The operation method comprises two methods, one is heating starch solution with water content more than 90%, and the starch granule content is 60-70%oSwelling begins between C and reaches 90 DEG CoC, the starch particles begin to crack, and hydrogen bonds among high molecular chains are opened to generate gelatinization; and the other is heating in a closed state, plasticating and extruding the starch with the water content of less than 28 percent.
Polylactic acid (PLA), also known as polylactide, belongs to the family of polyesters, and has the structural formula (-O-CHCH 3-CO-) n.
The two most important polymerization methods of polylactic acid are the direct polymerization method and the ring-opening polymerization method. The direct polymerization process is typically a polycondensation reaction. The polylactic acid is obtained by heating and dehydration condensation reaction between lactic acid molecules by utilizing the activity of the lactic acid. The direct polymerization method has simple production process and low production cost, and does not need to separate reaction intermediates. However, polylactic acid has a low molecular weight, a wide molecular weight distribution, and poor properties. The lactide ring-opening polymerization method adopts a two-step method to produce polylactic acid. Firstly, lactic acid is subjected to dehydration cyclization to prepare lactide, and then refined lactide is subjected to ring-opening polymerization to prepare polylactic acid. The polylactic acid prepared by the ring-opening polymerization method has better physical and mechanical properties, and the production cost of the method is higher than that of a direct polymerization method.
The degradation of polylactic acid is divided into simple hydrolysis (acid-base catalysis) and enzymatic hydrolysis degradation. The main degradation mode of polylactic acid is bulk erosion. Hydrophobic polymers become low relative molecular weight, water soluble molecules and monomers by hydrolysis of labile bonds (C-O bonds) in the backbone and then are further degraded by enzymes into water and carbon dioxide. The degradation of polylactic acid is firstly the hydrolysis of the amorphous regions and secondly the crystalline regions. The hydrolysis reaction is accelerated by the presence of carboxyl groups. The polylactic acid has autocatalysis inside, and the internal degradation speed is higher than that of the surface. At the beginning of the degradation, the hydrolysis of the ester bonds in the matrix is isotropic. During the degradation process, the terminal carboxyl groups play a catalytic role in hydrolysis. As the degradation proceeds, the amount of terminal carboxyl groups increases and the degradation rate increases.
Although the embodiments of the present invention have been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the invention, and all equivalent changes and modifications made within the scope of the present invention should be covered by the claims of the present invention.

Claims (6)

1. A bio-based full-degradable insect-proof mulching film is characterized in that:
comprises a surface layer, a middle layer and an inner layer;
the surface layer comprises a surface resin layer and a surface additive layer, the surface additive layer is positioned below the surface resin layer, the surface resin layer is modified polyvinyl alcohol resin, and the surface additive layer is an oxidative light degradation additive;
the middle layer comprises a middle layer resin layer and a middle layer additive layer, the middle layer additive layer is positioned below the middle layer resin layer, the middle layer resin layer is modified polylactic acid resin, and the middle layer additive layer is an oxidative thermal degradation additive;
the inner layer comprises an inner layer resin layer and an inner layer additive layer, the inner layer additive layer is positioned below the inner layer resin layer, the inner layer resin layer is modified polyhydroxyalkanoate resin, and the inner layer additive layer is an oxidative biodegradation additive.
2. The bio-based fully-degradable insect-proof mulching film according to claim 1, wherein: the thickness percentage of the surface layer is 15%, the thickness percentage of the middle layer is 70%, and the thickness percentage of the inner layer is 15%.
3. The bio-based fully-degradable insect-proof mulching film according to claim 1, wherein: the thickness percentage of the surface resin layer is 85 percent, and the thickness percentage of the surface additive layer is 15 percent.
4. The bio-based fully-degradable insect-proof mulching film according to claim 1, wherein: the thickness percentage of the middle layer resin layer is 90%, and the thickness percentage of the middle layer additive layer is 10%.
5. The bio-based fully-degradable insect-proof mulching film according to claim 1, wherein: the thickness percentage of the inner resin layer is 95%, and the thickness percentage of the inner additive layer is 5%.
6. The bio-based fully-degradable insect-proof mulching film according to claim 1, wherein: the oxidative photodegradation additive, the oxidative thermal degradation additive and the oxidative biodegradation additive are all nano zinc oxide.
CN201910479312.8A 2019-06-04 2019-06-04 Bio-based fully-degradable insect-proof mulching film Withdrawn CN110612846A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022043441A1 (en) * 2020-08-26 2022-03-03 Drypac Gmbh Packaging body

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022043441A1 (en) * 2020-08-26 2022-03-03 Drypac Gmbh Packaging body

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Application publication date: 20191227