CN109566210B - Multi-layer composite multifunctional full-biodegradable plastic mulching film and preparation method thereof - Google Patents

Multi-layer composite multifunctional full-biodegradable plastic mulching film and preparation method thereof Download PDF

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CN109566210B
CN109566210B CN201811492668.7A CN201811492668A CN109566210B CN 109566210 B CN109566210 B CN 109566210B CN 201811492668 A CN201811492668 A CN 201811492668A CN 109566210 B CN109566210 B CN 109566210B
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parts
layer
full
master batch
mulching film
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CN109566210A (en
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苑会林
石岩
胡东良
邵铭泉
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Beijing Huilin Yuan Biotechnology Co ltd
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Beijing Huilin Yuan Biotechnology 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • 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
    • 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
    • B32B27/36—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
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • 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
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/304—Insulating
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/552—Fatigue strength
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • 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
    • B32B2307/71—Resistive to light or to UV
    • 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
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/06—Biodegradable
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/28—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture specially adapted for farming

Abstract

The invention provides a multilayer composite multifunctional full-biodegradable plastic mulching film and a preparation method thereof, wherein the multilayer composite multifunctional full-biodegradable plastic mulching film at least comprises a stratum clinging layer and a supporting layer; the stratum close to the ground layer comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of reinforcing agent, 0-30 parts of filler, 5-20 parts of ground-attaching modified master batch and 0-5 parts of chain extender; the supporting layer comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of reinforcing agent, 0-30 parts of filler, 0-8 parts of auxiliary master batch and 0-5 parts of chain extender. The mulching film has the advantages of biodegradability, good ground adhesion, good mechanical strength and the like, and can freely adjust the required functionality, such as light turning property, heat preservation property and the like; and can be formed in one step by a multilayer coextrusion method.

Description

Multi-layer composite multifunctional full-biodegradable plastic mulching film and preparation method thereof
Technical Field
The invention relates to the field of agricultural mulching films, in particular to a multi-layer composite multifunctional full-biodegradable plastic mulching film and a preparation method thereof.
Background
The agricultural mulching film is used by China from the end of the last 80 th century, and the good heat preservation, water retention and fertilizer retention effects of the agricultural mulching film bring obvious yield increase for agriculture in China. However, the traditional mulching film is prepared by blow molding Polyethylene (PE), is not easy to degrade, can remain in nature for hundreds of years, and causes large-area white pollution. Seriously polluting the land and obviously reducing the yield and the income of crops.
At present, the main problems of white pollution are recycling and using degradable mulching films. The recycling has the defects of low residual film recycling rate, serious secondary processing pollution, overhigh labor cost and the like, so that the use of the full-biodegradable mulching film is an effective mode at present. Among the existing biodegradable plastic mulching films, the existing mulching films are mostly single-layer mulching films, have relatively single functions, and cannot meet the use requirements such as ground adhesion, strength, light conversion performance, ultraviolet resistance and the like.
Disclosure of Invention
In view of the problems in the background art, the present invention aims to provide a multi-layer composite multifunctional fully biodegradable plastic mulching film and a preparation method thereof, wherein the mulching film has the advantages of biodegradability, good ground adhesion, good mechanical strength, etc., and can freely adjust the required functionality, such as light turning performance, heat preservation, etc.; and can be formed in one step by a multilayer coextrusion method.
In order to achieve the above object, in a first aspect, the present invention provides a multi-layer composite multifunctional full-biodegradable plastic mulch film, which at least comprises a ground layer and a supporting layer; the stratum close to the ground layer comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of reinforcing agent, 0-30 parts of filler, 5-20 parts of ground-attaching modified master batch and 0-5 parts of chain extender; the supporting layer comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of reinforcing agent, 0-30 parts of filler, 0-8 parts of auxiliary master batch and 0-5 parts of chain extender.
Further, the multilayer composite multifunctional full-biodegradable plastic mulching film also comprises a functional layer positioned between the ground layer and the supporting layer, and the functional layer comprises the following components in parts by weight: 100 parts of full-biodegradable polyester, 10-20 parts of functional agent master batch and 0-5 parts of chain extender.
Further, the multilayer composite multifunctional full-biodegradable plastic mulching film further comprises a compatible layer, wherein the compatible layer comprises the following components in parts by weight: 100 parts of full-biodegradable polyester, 5-20 parts of compatilizer master batch and 0-5 parts of chain extender.
Further, the multi-functional full biodegradable plastics plastic film of multilayer complex has three layer construction, and three layer construction includes: stratum-functional layer-supporting layer.
Further, the multi-layer composite multifunctional full-biodegradable plastic mulching film has a five-layer structure, wherein the five-layer structure comprises: the adhesive layer, the compatible layer, the functional layer, the compatible layer and the supporting layer.
Further, the all-biodegradable polyester is one or a combination of polylactic acid (PLA), polybutylene adipate/terephthalate (PBAT), polybutylene succinate (PBS), polybutylene succinate-adipate (PBSA), polymethylethylene carbonate (PPC), polybutylene terephthalate-co-succinate (PBST), poly 3-hydroxybutyrate (PHB), polyglycolic acid (PGA), Polycaprolactone (PCL), Polyhydroxyalkanoate (PHA), polyhydroxybutyrate valerate (PHBV); the reinforcing agent is one or a combination of carbon black and white carbon black; the filler is one or combination of a bio-based filler and an inorganic filler; the chain extender comprises one or a combination of 1, 4-butanediol, 1, 6-hexanediol, glycerol, trimethylolpropane, diethylene glycol, triethylene glycol, neopentyl glycol, sorbitol, diethylaminoethanol, ethylenediamine, N-dihydroxy (diisopropyl) aniline, hydroquinone-bis (beta-hydroxyethyl) ether and 4,4 '-diamino-3, 3' -dichlorodiphenylmethane.
Further, the ground-attaching modified master batch comprises the following components in parts by weight: 100 parts of full-biodegradable polyester, 5-10 parts of glycerol and 80-100 parts of corn starch; the auxiliary agent master batch comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of glycerol and 80-100 parts of auxiliary agent.
Further, the functional agent master batch comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of glycerol and 50-100 parts of functional agent; the functional agent at least comprises a light conversion agent and a heat preservation agent; the light conversion agent at least comprises one of fluorescein sodium, acridine yellow, fluorescent yellow YG-51, 4, 8-dimethyl-7 carboxyl coumarin, acridine red and fluorescent red GG; the heat insulating agent at least comprises one of talcum powder, kaolin, calcium carbonate, clay, hydrotalcite, diatomite and glass beads.
Further, the compatilizer master batch comprises the following components in parts by weight: 100 parts of full-biodegradable polyester, 5-10 parts of glycerol and 50-100 parts of compatilizer; the compatilizer at least comprises one of maleic anhydride, bismaleimide, glycidyl methacrylate, vinyl silane and maleic anhydride-acrylic acid copolymer.
In order to achieve the above object, in a second aspect, the present invention provides a method for preparing a multi-layer composite multifunctional fully biodegradable plastic mulch film, for preparing the multi-layer composite multifunctional fully biodegradable plastic mulch film according to the first aspect of the present invention, comprising the steps of: (1) mixing the fully biodegradable polyester, the reinforcing agent, the filler, the ground-adhering modified master batch and the chain extender in proportion, and performing twin-screw extrusion granulation to obtain a ground-adhering to-be-processed granular material; (2) mixing the full-biodegradable polyester, the reinforcing agent, the filler, the auxiliary agent master batch and the chain extender in proportion, and carrying out double-screw extrusion granulation to obtain a granular material to be processed of the supporting layer; (3) mixing the fully biodegradable polyester, the functional agent and the chain extender in proportion, and performing twin-screw extrusion granulation to obtain a functional layer to-be-processed granular material; (4) mixing the fully biodegradable polyester, the compatilizer and the chain extender according to a ratio, and performing double-screw extrusion granulation to obtain a to-be-processed granular material of the compatible layer; (5) at least adding the granules to be processed on the stratum and the granules to be processed on the supporting layer into an extruder in multilayer coextrusion molding equipment with at least two extruders respectively, and performing coextrusion molding to obtain a multilayer composite multifunctional fully biodegradable plastic mulching film; wherein the multilayer coextrusion forming device is a coextrusion blow molding or coextrusion casting device.
The invention has the following beneficial effects:
1. compared with the traditional mulching film, the multilayer composite multifunctional full-biodegradable plastic mulching film has a multilayer structure and comprises a ground layer, a functional layer and a supporting layer; the stratum clinging to the ground contains corn starch, has certain hygroscopicity and viscosity, has better ground clinging property and is beneficial to paving among fields; the functional layer can set functions such as light conversion and the like by adjusting the formula of the functional agent master batch in the preparation process according to needs; the supporting layer has higher mechanical strength, good weather resistance, hydrolysis resistance and ultraviolet aging resistance.
2. The functional layer is arranged between the stratum and the supporting layer, does not contact air and external substances, and avoids the functional failure in a short period; in addition, the independent existence of a plurality of functional layers enables the mulching film to have multiple functions, such as optical rotation and heat preservation, and the like, and avoids adding a plurality of functional additives into a single functional layer, so that the effectiveness of the functional layer is improved under the condition of not reducing the mechanical property of the film.
3. Compatible layer can improve the compatibility between each layer in this plastic film, takes place the inter-lamination and peels off in avoiding the use, realizes can using different full biodegradable polyester in the different layers in this plastic film to make this plastic film have better comprehensive properties, for example have intensity, pliability and ageing resistance etc. concurrently.
4. The modification and forming method used by the invention does not need to add special equipment, is easy to implement and operate, and can be produced on the existing general film forming equipment.
5. The multilayer composite multifunctional full-biodegradable plastic mulching film can be widely applied to agriculture in various regions and is suitable for various crops.
Further features of the invention and advantages thereof will become apparent from the detailed description of exemplary embodiments thereof.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
First, the multi-layer composite multi-functional fully biodegradable plastic mulching film according to the first aspect of the present invention will be described.
The multilayer composite multifunctional full-biodegradable plastic mulching film at least comprises a ground layer and a supporting layer; the stratum close to the ground layer comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of reinforcing agent, 0-30 parts of filler, 5-20 parts of ground-attaching modified master batch and 0-5 parts of chain extender; the supporting layer comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of reinforcing agent, 0-30 parts of filler, 0-8 parts of auxiliary master batch and 0-5 parts of chain extender.
In the multilayer composite multifunctional fully biodegradable plastic mulching film, the multilayer composite multifunctional fully biodegradable plastic mulching film further comprises a functional layer positioned between the ground layer and the supporting layer, and the functional layer comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 10-20 parts of functional agent master batch and 0-5 parts of chain extender.
In the multilayer composite multifunctional fully biodegradable plastic mulching film, the multilayer composite multifunctional fully biodegradable plastic mulching film further comprises a compatible layer, and the compatible layer comprises the following components in parts by weight: 100 parts of full-biodegradable polyester, 5-20 parts of compatilizer master batch and 0-5 parts of chain extender. The compatibilizing layer may be located between the conforming layer and the functional layer, or between the support layer and the functional layer, or between adjacent functional layers.
In the multi-layer composite multifunctional fully biodegradable plastic mulch film according to the present invention, the fully biodegradable polyester is one or a combination of polylactic acid (PLA), polybutylene adipate/terephthalate (PBAT), polybutylene succinate (PBS), polybutylene succinate-adipate (PBSA), polymethylethylene carbonate (PPC), polybutylene terephthalate-co-succinate (PBST), poly 3-hydroxybutyrate (PHB), polyglycolic acid (PGA), Polycaprolactone (PCL), Polyhydroxyalkanoate (PHA), polyhydroxybutyrate valerate (PHBV);
in the multilayer composite multifunctional full-biodegradable plastic mulching film, the reinforcing agent is one or a combination of carbon black and white carbon black.
In the multilayer composite multifunctional fully biodegradable plastic mulching film, the filler is one or a combination of a bio-based filler and an inorganic filler; wherein the bio-based filler is one or a combination of corn starch, thermoplastic starch, wood powder, bamboo powder, rice hull powder and plant fiber; the mesh number of the wood powder, the bamboo powder and the rice hull powder is more than or equal to 100 meshes; the plant fiber is one or a combination of cotton fiber, hemp fiber, bamboo fiber and wood pulp fiber; the inorganic filler is one or a combination of clay, diatomite, glass microspheres, talcum powder, wollastonite, calcium carbonate, mica powder, kaolin, montmorillonite, glass fiber, quartz fiber and aluminum silicate fiber; the inorganic filler is treated by a silane coupling agent.
In the multi-layer composite multifunctional fully biodegradable plastic mulching film according to the present invention, the chain extender includes one or a combination of 1, 4-butanediol, 1, 6-hexanediol, glycerol, trimethylolpropane, diethylene glycol, triethylene glycol, neopentyl glycol, sorbitol, diethylaminoethanol, ethylenediamine, N-dihydroxy (diisopropyl) aniline, hydroquinone-bis (β -hydroxyethyl) ether, 4 '-diamino-3, 3' -dichlorodiphenylmethane.
In the multi-layer composite multifunctional fully biodegradable plastic mulching film according to the present invention, the multi-layer composite multifunctional fully biodegradable plastic mulching film has a three-layer structure comprising: stratum-functional layer-supporting layer.
In the multi-layer composite multifunctional fully biodegradable plastic mulching film according to the present invention, the multi-layer composite multifunctional fully biodegradable plastic mulching film has a five-layer structure comprising: the adhesive layer, the compatible layer, the functional layer, the compatible layer and the supporting layer.
In the multi-layered composite multifunctional fully biodegradable plastic mulching film according to the present invention, the multi-layered composite multifunctional fully biodegradable plastic mulching film has a seven-layered structure comprising: the adhesive layer, the compatible layer, the functional layer, the compatible layer and the supporting layer.
In the multi-layered composite multifunctional fully biodegradable plastic mulching film according to the present invention, the multi-layered composite multifunctional fully biodegradable plastic mulching film has a nine-layered structure comprising: the adhesive layer, the compatible layer, the functional layer, the compatible layer, the supporting layer.
In the multilayer composite multifunctional full-biodegradable plastic mulching film, the ground-attaching modified master batch comprises the following components in parts by weight: 100 parts of full-biodegradable polyester, 5-10 parts of glycerol and 80-100 parts of corn starch.
In the multilayer composite multifunctional full-biodegradable plastic mulching film, the auxiliary agent master batch comprises the following components in parts by weight: 100 parts of full-biodegradable polyester, 5-10 parts of glycerol and 80-100 parts of auxiliary agent. Wherein the auxiliary agent is one or a combination of a light stabilizer, an antioxidant, a plasticizer, a lubricant and an anti-hydrolysis agent; the light stabilizer is one or a combination of UV-123, UV-326 and UV-328; the antioxidant is one or a combination of arylamine tertiary amine antioxidant, hydrazide antioxidant, hindered phenol antioxidant and thioester thioether antioxidant; the arylamine tertiary amine antioxidant is an anti-aging agent AH; the hydrazide antioxidant is ORA; the hindered phenol antioxidant is one or a combination of an antioxidant 1010, an antioxidant 1076 and an antioxidant 2246; the thioester thioether type antioxidant is one or a combination of an antioxidant 2246-S, an antioxidant methylene 4426-S, an antioxidant DLTP and an antioxidant DSTP; the plasticizer is one or a combination of glycerol, polyethylene glycol, sorbitol, polypropylene glycol, adipic acid di (2-ethylhexyl) ester and dibutyl adipate; the lubricant is one or a combination of calcium stearate, fatty amide, stearic acid, oxidized polyethylene wax and glyceryl stearate; the hydrolysis resistant agent is one or a combination of N, N' -bis (2, 6-diisopropylphenyl) carbodiimide, polycarbodiimide, 2-oxazoline, 3-oxazoline, 4-oxazoline, phenyl glycidyl ether, bisphenol A diglycidyl ether, tetra (phenyl glycidyl-ether) ethane and trimethoxy [3- (glycidyl ether) propyl ] silane.
In the multilayer composite multifunctional full-biodegradable plastic mulching film, the functional agent master batch comprises the following components in parts by weight: 100 parts of full-biodegradable polyester, 5-10 parts of glycerol and 50-100 parts of functional agent; wherein, the functional agent at least comprises a light conversion agent and a heat preservation agent; the light conversion agent at least comprises one of fluorescein sodium, acridine yellow, fluorescent yellow YG-51, 4, 8-dimethyl-7 carboxyl coumarin, acridine red and fluorescent red GG; the heat insulating agent at least comprises one of talcum powder, kaolin, calcium carbonate, clay, hydrotalcite, diatomite and glass beads.
In the multilayer composite multifunctional full-biodegradable plastic mulching film, the compatilizer master batch comprises the following components in parts by weight: 100 parts of full-biodegradable polyester, 5-10 parts of glycerol and 50-100 parts of compatilizer; wherein the compatilizer at least comprises one of maleic anhydride, bismaleimide, glycidyl methacrylate, vinyl silane and maleic anhydride-acrylic acid copolymer.
Next, the preparation method of the multi-layer composite multifunctional full-biodegradable plastic mulching film according to the second aspect of the invention is explained.
The preparation method of the multilayer composite multifunctional fully biodegradable plastic mulching film is used for preparing the multilayer composite multifunctional fully biodegradable plastic mulching film according to the first aspect of the invention, and comprises the following steps: (1) mixing the fully biodegradable polyester, the reinforcing agent, the filler, the ground-adhering modified master batch and the chain extender in proportion, and performing twin-screw extrusion granulation to obtain a ground-adhering to-be-processed granular material; (2) mixing the full-biodegradable polyester, the reinforcing agent, the filler, the auxiliary agent master batch and the chain extender in proportion, and carrying out double-screw extrusion granulation to obtain a granular material to be processed of the supporting layer; (3) mixing the fully biodegradable polyester, the functional agent and the chain extender in proportion, and performing twin-screw extrusion granulation to obtain a functional layer to-be-processed granular material; (4) mixing the fully biodegradable polyester, the compatilizer and the chain extender according to a ratio, and performing double-screw extrusion granulation to obtain a to-be-processed granular material of the compatible layer; (5) at least adding the granules to be processed on the stratum and the granules to be processed on the supporting layer into an extruder in multilayer coextrusion molding equipment with at least two extruders respectively, and performing coextrusion molding to obtain a multilayer composite multifunctional fully biodegradable plastic mulching film; wherein the multilayer coextrusion forming device is a coextrusion blow molding or coextrusion casting device.
The preparation method of the multilayer composite multifunctional fully biodegradable plastic mulching film of the invention is specifically described below with reference to specific examples.
Example 1
(1) Mixing polylactic acid (PLA), carbon black and ground-adhering modified master batches according to the mass part ratio of 100:5:5, and performing double-screw extrusion granulation to obtain a ground-adhering layer to-be-processed granular material; wherein, the ground-attaching modified master batch comprises the following components in parts by weight:
polylactic acid (PLA) 100 parts
5 parts of glycerin
80 parts of corn starch.
(2) Mixing polyhydroxybutyrate valerate (PHBV) and carbon black according to the mass part ratio of 100:5, and performing twin-screw extrusion granulation to obtain a granular material to be processed on the supporting layer;
(3) mixing the fully biodegradable polyester and the functional agent master batch according to the mass part ratio of 100:10, and performing double-screw extrusion granulation to obtain a functional layer to-be-processed granular material; wherein the functional agent master batch comprises the following components in parts by mass:
polylactic acid (PLA) 100 parts
5 parts of glycerin
50 portions of hydrotalcite
(4) Adding the particle materials to be processed on the stratum, the particle materials to be processed on the supporting layer and the particle materials to be processed on the functional layer into 3 extruders in a three-layer co-extrusion molding device, and performing co-extrusion blow molding to obtain the multi-layer composite multifunctional fully biodegradable plastic mulching film, wherein the multi-layer composite multifunctional fully biodegradable plastic mulching film has a three-layer structure, and the three-layer structure comprises: the laminated layer-functional layer-supporting layer, the functional layer has the function of heat preservation.
Example 2
(1) Mixing polylactic acid (PLA), carbon black and ground-adhering modified master batches according to the mass part ratio of 100:5:5, and performing double-screw extrusion granulation to obtain a ground-adhering layer to-be-processed granular material; wherein, the ground-attaching modified master batch comprises the following components in parts by weight:
polylactic acid (PLA) 100 parts
5 parts of glycerin
80 parts of corn starch.
(2) Mixing polyhydroxybutyrate valerate (PHBV) and carbon black according to the mass part ratio of 100:5, and performing twin-screw extrusion granulation to obtain a granular material to be processed on the supporting layer;
(3) mixing the fully biodegradable polyester and the functional agent master batch according to the mass part ratio of 100:10, and performing double-screw extrusion granulation to obtain a functional layer to-be-processed granular material; wherein the functional agent master batch comprises the following components in parts by mass:
polylactic acid (PLA) 100 parts
5 parts of glycerin
Fluorescein sodium 50 parts
(4) Mixing Polyhydroxyalkanoate (PHA) and the compatilizer master batch according to the mass part ratio of 100:5, and carrying out twin-screw extrusion granulation to obtain a granular material to be processed of the compatible layer; wherein the compatilizer master batch comprises the following components in parts by mass:
100 portions of Polyhydroxyalkanoate (PHA)
5 parts of glycerin
50 parts of maleic anhydride
(5) Will paste stratum and wait to process granule material, supporting layer and wait to process granule material, functional layer and wait to process granule material and compatible layer and wait to process granule material, add 5 extruders in five layers of coextrusion former respectively, coextrusion blow molding obtains the compound multi-functional full biodegradable plastic mulching film of multilayer, the compound multi-functional full biodegradable plastic mulching film of multilayer has five layer structure, and five layer structure include: the light-transmitting layer comprises a laminated layer, a compatible layer, a functional layer, a compatible layer and a supporting layer, wherein the functional layer has a light-transmitting function.
Example 3
(1) Mixing poly (adipic acid)/butylene terephthalate (PBAT), white carbon black, 300-mesh wood powder, ground-attached modified master batch and 1, 4-butanediol according to the mass part ratio of 100:10:30:20:5, and performing twin-screw extrusion granulation to obtain a granular material to be processed of the ground layer; wherein, the ground-attaching modified master batch comprises the following components in parts by weight:
100 parts of poly (butylene adipate terephthalate) (PBAT)
10 portions of glycerin
90 parts of corn starch.
(2) Mixing poly 3-hydroxybutyrate (PHB), white carbon black, corn starch, auxiliary agent masterbatch and hydroquinone-bis (beta-hydroxyethyl) ether according to the mass ratio of 100:10:30:8:5, and performing twin-screw extrusion granulation to obtain a granular material to be processed on the supporting layer; wherein the auxiliary agent master batch comprises the following components in parts by mass:
100 portions of poly 3-hydroxybutyrate (PHB)
10 portions of glycerin
100 parts of anti-aging agent AH.
(3) Mixing polyglycolic acid (PGA), a functional agent master batch and N, N-dihydroxy (diisopropyl) aniline according to the mass part ratio of 100:20:5, and carrying out double-screw extrusion granulation to obtain a functional layer to-be-processed granular material; wherein the functional agent master batch comprises the following components in parts by mass:
polyglycolic acid (PGA) 100 parts
10 portions of glycerin
100 portions of 4, 8-dimethyl-7 carboxyl coumarin
(4) Mixing Polycaprolactone (PCL), a compatilizer master batch and ethylenediamine according to the mass ratio of 100:20:5, and carrying out twin-screw extrusion granulation to obtain a to-be-processed granular material of the compatible layer; wherein the compatilizer master batch comprises the following components in parts by mass:
100 portions of Polycaprolactone (PCL)
10 portions of glycerin
100 parts of bismaleimide
(5) Will paste stratum and wait to process granule material, supporting layer and wait to process granule material, functional layer and wait to process granule material and compatible layer and wait to process granule material, add 7 extruders in seven layers of coextrusion former respectively in, coextrusion curtain coating shaping obtains the compound multi-functional full biodegradable plastic mulching film of multilayer, the compound multi-functional full biodegradable plastic mulching film of multilayer has seven layer structures, and seven layer structures include: the light-transmitting layer comprises a laminated layer, a compatible layer, a functional layer, a compatible layer and a supporting layer, wherein the functional layer has a light-transmitting function.
Example 4
(1) Mixing polybutylene succinate (PBS), white carbon black, 800-mesh bamboo powder, ground-attached modified master batch and 1, 6-hexanediol according to the mass part ratio of 100:7:15:12:3, and carrying out double-screw extrusion granulation to obtain a ground-attached layer to-be-processed granular material; wherein, the ground-attaching modified master batch comprises the following components in parts by weight:
100 portions of Poly Butylene Succinate (PBS)
8 portions of glycerol
90 parts of corn starch.
(2) Mixing polybutylene succinate (PBS), white carbon black, thermoplastic starch, auxiliary agent masterbatch and glycerol according to the mass part ratio of 100:8:15:4:2, and performing double-screw extrusion granulation to obtain a granular material to be processed on the supporting layer; wherein the auxiliary agent master batch comprises the following components in parts by mass:
100 portions of Poly Butylene Succinate (PBS)
7 parts of glycerol
101090 parts of antioxidant.
(3) Mixing polybutylene succinate (PBS), a functional agent master batch and trimethylolpropane according to the mass part ratio of 100:20:5, and carrying out double-screw extrusion granulation to obtain a functional layer to-be-processed granular material; wherein the functional agent master batch comprises the following components in parts by mass:
100 portions of Poly Butylene Succinate (PBS)
8 portions of glycerol
80 parts of acridine red
(4) Mixing polybutylene succinate (PBS), a compatilizer master batch and diethylene glycol according to the mass part ratio of 100:20:5, and performing double-screw extrusion granulation to obtain a granular material to be processed of a compatible layer; wherein the compatilizer master batch comprises the following components in parts by mass:
100 portions of Poly Butylene Succinate (PBS)
7 parts of glycerol
80 parts of maleic anhydride-acrylic acid copolymer
(5) The particle materials to be processed in the stratum, the particle materials to be processed in the supporting layer, the particle materials to be processed in the functional layer and the particle materials to be processed in the compatible layer are respectively added into 9 extruders in nine-layer co-extrusion molding equipment, and the multi-layer composite multifunctional full-biodegradable plastic mulching film is obtained through co-extrusion blow molding, and has nine-layer structure, and the nine-layer structure comprises: the light-transmitting layer comprises a laminated layer, a compatible layer, a functional layer, a compatible layer and a supporting layer, wherein the functional layer has a light-transmitting function.
Example 5
(1) Mixing poly (butylene succinate-co-adipate) (PBSA), white carbon black, 400-mesh rice hull powder, ground-adhering modified master batches and triethylene glycol according to the mass part ratio of 100:7:15:12:3, and performing double-screw extrusion granulation to obtain a granular material to be processed in a ground adhering layer; wherein, the ground-attaching modified master batch comprises the following components in parts by weight:
100 portions of poly (butylene succinate-adipate) (PBSA)
8 portions of glycerol
90 parts of corn starch.
(2) Mixing polymethyl ethylene carbonate (PPC), white carbon black, cotton fiber, auxiliary agent master batch and neopentyl glycol according to the mass part ratio of 100:8:15:4:2, and performing double-screw extrusion granulation to obtain a to-be-processed granular material of the supporting layer; wherein the auxiliary agent master batch comprises the following components in parts by mass:
100 parts of polymethyl ethylene carbonate (PPC)
7 parts of glycerol
101090 parts of antioxidant.
(3) Mixing poly (terephthalic acid) -co-butylene succinate (PBST), the functional agent master batch and sorbitol according to the mass part ratio of 100:20:5, and carrying out double-screw extrusion granulation to obtain a functional layer to-be-processed granular material; wherein the functional agent master batch comprises the following components in parts by mass:
100 parts of poly (terephthalic acid) -co-butylene succinate (PBST)
8 portions of glycerol
Acridine yellow 80 parts
(4) Mixing Polycaprolactone (PCL), a compatilizer master batch and diethylaminoethanol according to the mass ratio of 100:20:5, and performing twin-screw extrusion granulation to obtain a to-be-processed granular material of the compatible layer; wherein the compatilizer master batch comprises the following components in parts by mass:
100 portions of Polycaprolactone (PCL)
7 parts of glycerol
80 parts of glycidyl methacrylate
(5) The particle materials to be processed in the stratum, the particle materials to be processed in the supporting layer, the particle materials to be processed in the functional layer and the particle materials to be processed in the compatible layer are respectively added into 9 extruders in nine-layer co-extrusion molding equipment, and the multi-layer composite multifunctional full-biodegradable plastic mulching film is obtained through co-extrusion blow molding, and has nine-layer structure, and the nine-layer structure comprises: the light-transmitting layer comprises a laminated layer, a compatible layer, a functional layer, a compatible layer and a supporting layer, wherein the functional layer has a light-transmitting function.
Example 6
(1) Mixing poly (butylene succinate-co-adipate) (PBSA), white carbon black, fibrilia, ground-adhering modified master batch and hydroquinone-bis (beta-hydroxyethyl) ether according to the mass part ratio of 100:7:15:12:3, and performing double-screw extrusion granulation to obtain a ground-adhering to-be-processed granular material; wherein, the ground-attaching modified master batch comprises the following components in parts by weight:
100 portions of poly (butylene succinate-adipate) (PBSA)
8 portions of glycerol
90 parts of corn starch.
(2) Mixing polymethyl ethylene carbonate (PPC), white carbon black, wollastonite, an auxiliary agent master batch and hydroquinone-bis (beta-hydroxyethyl) ether according to the mass ratio of 100:8:15:4:2, and performing double-screw extrusion granulation to obtain a granular material to be processed on the supporting layer; wherein the auxiliary agent master batch comprises the following components in parts by mass:
100 parts of polymethyl ethylene carbonate (PPC)
7 parts of glycerol
101090 parts of antioxidant.
(3) Mixing poly (terephthalic acid) -co-butylene succinate (PBST), a functional agent master batch and 4,4 '-diamino-3, 3' -dichlorodiphenylmethane according to the mass part ratio of 100:20:5, and carrying out double-screw extrusion granulation to obtain a to-be-processed granular material of a first functional layer; wherein the functional agent master batch comprises the following components in parts by mass:
100 parts of poly (terephthalic acid) -co-butylene succinate (PBST)
8 portions of glycerol
Fluorescent yellow YG-5180 parts
(4) Mixing poly (terephthalic acid) -co-butylene succinate (PBST), a functional agent master batch and 4,4 '-diamino-3, 3' -dichlorodiphenylmethane according to the mass part ratio of 100:20:5, and carrying out double-screw extrusion granulation to obtain a to-be-processed granular material of a second functional layer; wherein the functional agent master batch comprises the following components in parts by mass:
100 parts of poly (terephthalic acid) -co-butylene succinate (PBST)
8 portions of glycerol
80 portions of glass beads
Wherein the glass microspheres are treated by a silane coupling agent KH 550.
(5) Mixing poly (terephthalic acid) -co-butylene succinate (PBST), a compatilizer master batch and diethylaminoethanol according to the mass ratio of 100:20:5, and performing double-screw extrusion granulation to obtain a granular material to be processed of a compatible layer; wherein the compatilizer master batch comprises the following components in parts by mass:
100 parts of poly (terephthalic acid) -co-butylene succinate (PBST)
7 parts of glycerol
Vinyl silane 80 parts
(6) Respectively adding the particle materials to be processed in the stratum, the particle materials to be processed in the supporting layer, the particle materials to be processed in the first functional layer, the particle materials to be processed in the second functional layer and the particle materials to be processed in the compatible layer into 9 extruders in nine-layer co-extrusion molding equipment, and performing co-extrusion blow molding to obtain the multi-layer composite multi-functional full-biodegradable plastic mulching film, wherein the multi-layer composite multi-functional full-biodegradable plastic mulching film has nine layers of structures, and the nine layers of structures comprise: the laminated layer-compatible layer-first functional layer-compatible layer-second functional layer-compatible layer-first functional layer-compatible layer-supporting layer, wherein the first functional layer has a light conversion function, and the second functional layer has a heat preservation function.
Comparative example 1
Mixing polylactic acid (PLA) and carbon black according to the mass part ratio of 100:5, carrying out double-screw extrusion granulation, and carrying out extrusion molding to obtain the single-layer film.
Performance testing
1. Measurement of tensile Strength and elongation at Break
According to the test conditions for films and sheets, part 3 of the national Standard "determination of tensile Properties of plastics" (GB \ T1040.3-2006): the dumbbell specimens have a length of 150mm, a narrow parallel width of 10mm, a drawing speed of 200mm/min and a room temperature of 25 ℃.
2. Determination of Right Angle tear Strength
Quote QB/T1130-1991 "Plastic Right Angle tear Performance test method", tensile speed 200mm/min, room temperature 25 ℃.
3. Measurement of peeling Strength
The width of the film sample is 15mm, and the length of the film sample is 200 mm; the polar engineering plastic layer and the polyolefin layer were peeled off in advance in the longitudinal direction of the sample, and T-peeling was carried out, and the average peel force (N) was measured at a test speed of 300 mm/min.
The results of the performance tests are shown in table 1.
Table 1 results of performance testing
Figure BDA0001896062850000141
Figure BDA0001896062850000151
The embodiment shows that the multi-layer composite multifunctional full-biodegradable plastic mulching film provided by the invention has better tensile strength relative to a single-layer mulching film besides functionality, and has better peeling strength due to the existence of the compatible layer; in addition, the modification and forming method can be produced on the existing general film forming equipment, is simple and practical, and does not need to increase special equipment.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (5)

1. The utility model provides a multi-functional full biodegradable plastic mulching film of multilayer complex which characterized in that, multi-functional full biodegradable plastic mulching film of multilayer complex has five layer structure, and five layer structure includes: a stratum-compatible layer-a functional layer-a compatible layer-a supporting layer;
the stratum close to the ground layer comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of reinforcing agent, 0-30 parts of filler, 5-20 parts of ground-attaching modified master batch and 0-5 parts of chain extender; the ground-attaching modified master batch comprises the following components in parts by weight: 100 parts of full-biodegradable polyester, 5-10 parts of glycerol and 80-100 parts of corn starch;
the supporting layer comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of reinforcing agent, 0-30 parts of filler, 0-8 parts of auxiliary master batch and 0-5 parts of chain extender; the auxiliary agent master batch comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of glycerol and 80-100 parts of auxiliary agent;
the functional layer comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 10-20 parts of functional agent master batch and 0-5 parts of chain extender; the functional agent master batch comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of glycerol and 50-100 parts of functional agent;
the compatible layer comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-20 parts of compatilizer master batch and 0-5 parts of chain extender; the compatilizer master batch comprises the following components in parts by mass: 100 parts of full-biodegradable polyester, 5-10 parts of glycerol and 50-100 parts of compatilizer.
2. The multi-layer composite multifunctional full-biodegradable plastic mulching film according to claim 1,
the fully biodegradable polyester is one or a combination of polylactic acid (PLA), polybutylene adipate/terephthalate (PBAT), polybutylene succinate (PBS), polybutylene succinate-adipate (PBSA), polymethyl ethylene carbonate (PPC), polybutylene terephthalate-co-butylene succinate (PBST), poly-3-hydroxybutyrate (PHB), polyglycolic acid (PGA), Polycaprolactone (PCL), Polyhydroxyalkanoate (PHA) and polyhydroxybutyrate valerate (PHBV);
the reinforcing agent is one or a combination of carbon black and white carbon black;
the filler is one or combination of a bio-based filler and an inorganic filler;
the chain extender comprises one or a combination of 1, 4-butanediol, 1, 6-hexanediol, glycerol, trimethylolpropane, diethylene glycol, triethylene glycol, neopentyl glycol, sorbitol, diethylaminoethanol, ethylenediamine, N-dihydroxy (diisopropyl) aniline, hydroquinone-bis (beta-hydroxyethyl) ether and 4,4 '-diamino-3, 3' -dichlorodiphenylmethane.
3. The multi-layer composite multifunctional full-biodegradable plastic mulching film according to claim 1,
the functional agent at least comprises one of a light conversion agent and a heat preservation agent;
the light conversion agent at least comprises one of fluorescein sodium, acridine yellow, fluorescent yellow YG-51, 4, 8-dimethyl-7 carboxyl coumarin, acridine red and fluorescent red GG;
the heat insulating agent at least comprises one of talcum powder, kaolin, calcium carbonate, clay, hydrotalcite, diatomite and glass beads.
4. The preparation method of the multilayer composite multifunctional full-biodegradable plastic mulching film according to claim 1, is characterized in that,
the compatilizer at least comprises one of maleic anhydride, bismaleimide, glycidyl methacrylate, vinyl silane and maleic anhydride-acrylic acid copolymer.
5. A preparation method of the multilayer composite multifunctional fully biodegradable plastic mulching film, which is used for preparing the multilayer composite multifunctional fully biodegradable plastic mulching film as claimed in any one of claims 1 to 4, and is characterized by comprising the following steps:
(1) mixing the fully biodegradable polyester, the reinforcing agent, the filler, the ground-adhering modified master batch and the chain extender in proportion, and performing twin-screw extrusion granulation to obtain a ground-adhering to-be-processed granular material;
(2) mixing the full-biodegradable polyester, the reinforcing agent, the filler, the auxiliary agent master batch and the chain extender in proportion, and carrying out double-screw extrusion granulation to obtain a granular material to be processed of the supporting layer;
(3) mixing the fully biodegradable polyester, the functional agent and the chain extender in proportion, and performing twin-screw extrusion granulation to obtain a functional layer to-be-processed granular material;
(4) mixing the fully biodegradable polyester, the compatilizer and the chain extender according to a ratio, and performing double-screw extrusion granulation to obtain a to-be-processed granular material of the compatible layer;
(5) at least adding the granules to be processed on the stratum and the granules to be processed on the supporting layer into an extruder in multilayer coextrusion molding equipment with at least two extruders respectively, and performing coextrusion molding to obtain a multilayer composite multifunctional fully biodegradable plastic mulching film; wherein the multilayer coextrusion forming device is a coextrusion blow molding or coextrusion casting device.
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