CN110614830A - Bio-based high-barrier composite membrane - Google Patents

Bio-based high-barrier composite membrane Download PDF

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Publication number
CN110614830A
CN110614830A CN201910479289.2A CN201910479289A CN110614830A CN 110614830 A CN110614830 A CN 110614830A CN 201910479289 A CN201910479289 A CN 201910479289A CN 110614830 A CN110614830 A CN 110614830A
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layer
additive
resin
degradation
bio
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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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    • 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
    • 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
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B32B2307/306—Resistant to heat
    • 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
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • 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
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/16—Biodegradable polymers
    • 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
    • C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2469/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
    • 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
    • C08K5/39—Thiocarbamic acids; Derivatives thereof, e.g. dithiocarbamates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Biological Depolymerization Polymers (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

The invention belongs to the technical field of bio-based degradation, and particularly relates to a bio-based high-barrier composite membrane, 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 resin layer is quintuple controllably degradable (WCSZ) resin, and the surface additive layer is quadruple controllably degradable (SCZJ) 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 polybutylene succinate (SHQ-MBS) resin, and the middle layer additive layer is an oxygen-containing polymer material controllable degradation (JHZJ) additive; the inner layer comprises an inner resin layer and an inner additive layer, the inner additive layer is positioned below the inner resin layer, the inner resin layer is modified polypropylene carbonate (SHQ-MPC) resin, and the inner additive layer is an oxygen-containing resin controlled degradation (YZZJ) additive.

Description

Bio-based high-barrier composite membrane
Technical Field
The invention belongs to the technical field of bio-based degradation, and particularly relates to a bio-based high-barrier composite membrane.
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 high-barrier composite membrane applied in practice is not thoroughly degraded and has poor implementation effect.
Disclosure of Invention
The invention provides a bio-based high-barrier composite membrane, 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 high-barrier composite membrane 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 quintuple controlled degradation (WCSZ) resin, and the surface additive layer is quadruple controlled degradation (SCZJ) 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 polybutylene succinate (SHQ-MBS) resin, and the middle layer additive layer is an oxygen-containing polymer material controllable degradation (JHZJ) additive;
the inner layer comprises an inner resin layer and an inner additive layer, the inner additive layer is positioned below the inner resin layer, the inner resin layer is modified polypropylene carbonate (SHQ-MPC) resin, and the inner additive layer is an oxygen-containing resin controlled degradation (YZZJ) 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 quadruple controlled degradation (SCZJ) additive, the oxygen-containing polymer material controlled degradation (JHZJ) additive and the oxygen-containing resin controlled degradation (YZJ) additive are all as follows: nickel dithiocarbamate.
The invention has the beneficial effects that:
the composite membrane prepared by the technical scheme can realize complete degradation, has ideal implementation effect,
the concrete component effects are as follows:
1 quintuple controlled degradation (WCSZ) resin: the degradable modified resin is added in the production process of the degradable plastic product, so that various non-degradable plastic products are changed into controllable and completely degradable plastic products, the degradable plastic products using the degradable modified resin can be degraded when being exposed to sunlight, high temperature or external force, and the degradation time and speed are controllable. In the production process of the degradable plastics, the triple controllable degradable resins are prepared by adopting a multi-layer co-extrusion molding process, and the degradable resins with different polarities are co-extruded into a molding chamber by utilizing a special process, so that the biodegradation of compost and the oxidative biodegradation are effectively combined together, and the degradation controllability and the complete degradability are really realized. The triple controllable degradable resin has no toxicity, can be contacted with edible substances, has strong processability, is compatible with most materials, has controllable degradability, can control the degradation time according to the required requirement, has 100 percent of environmental degradability, can be completely converted into water, carbon dioxide and organic substances, can not be harmful to the environment or soil, has high cost performance, and has lower cost compared with other degradation technologies. The triple controllable degradable resin is mainly used in garbage treating system, packing industry, agriculture, compost and plastic producing industry, and is suitable for producing various degradable plastic products, such as mulching film, drip irrigation belt, shopping bag, vest bag, garbage bag, express bag, snack box, etc.
2 modified polybutylene succinate (SHQ-MBS) resin: the polybutylene succinate is synthesized by condensation polymerization of succinic acid and butanediol, the short part of the polybutylene succinate is brittle in performance, low in transparency and poor in flexibility, after resin modification, the modified polybutylene succinate resin solves the problem of short part of brittle performance, improves the transparency and enhances the flexibility, the modified polybutylene succinate resin is a typical completely biodegradable polymer material, has good biocompatibility and biological absorbability and good heat resistance, and the synthetic raw material source of the polybutylene succinate resin can be petroleum resources and also can be obtained by fermentation of biological resources. The modified poly (butylene succinate) resin has the performance between that of polyethylene and polypropylene, can be directly used as plastic for processing and use, has wide application, can be used for the packaging field, such as packaging films, lunch boxes, cosmetic bottles, medicine bottles, electronic device packages and the like, can be used for disposable appliances, can be used for the agricultural field, such as agricultural films, pesticides, fertilizer slow-release materials and the like, and can also be used for the medical field, such as biomedical high polymer materials.
3 modified polypropylene carbonate (SHQ-MPC) resin: the poly (propylene carbonate) resin is a completely degradable environment-friendly plastic synthesized by taking carbon dioxide and propylene oxide as raw materials, has the defects of poor compatibility with other degradable resin materials and higher cost, solves the compatibility with other resin materials through modification, and reduces the cost. The modified polypropylene carbonate resin has full biodegradability and good gas barrier property, does not cause any damage influence on the environment, avoids the phenomenon of white pollution, belongs to an environment-friendly material, and is superior in barrier property and cost performance compared with EVOH, PVDC and PA petroleum-based barrier materials. The modified polypropylene carbonate resin is a controllable barrier degradation material, can control barrier degradation time according to the storage period of articles, and is mainly used for manufacturing various food packaging, medical packaging, household appliance packaging and other degradation films.
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 high-barrier composite membrane comprises a surface layer 1, a middle layer 2 and an inner layer 3;
the surface layer 1 comprises a surface layer resin layer 4 and a surface layer additive layer 5, the surface layer additive layer 5 is positioned below the surface layer resin layer 4, the surface layer resin layer 4 is quintuple controlled degradation (WCSZ) resin, and the surface layer additive layer 5 is quadruple controlled degradation (SCZJ) additive;
the middle layer 2 comprises a middle layer resin layer 6 and a middle layer additive layer 7, the middle layer additive layer 7 is positioned below the middle layer resin layer 6, the middle layer resin layer 6 is modified polybutylene succinate (SHQ-MBS) resin, and the middle layer additive layer 7 is an oxygen-containing polymer material controllable degradation (JHZJ) additive;
the inner layer 3 comprises an inner resin layer 8 and an inner additive layer 9, the inner additive layer 9 is positioned below the inner resin layer 8, the inner resin layer 8 is modified polypropylene carbonate (SHQ-MPC) resin, and the inner additive layer 9 is an oxygen-containing resin controlled degradation (YZJ) additive.
The thickness percentage of the surface layer 1 is 15%, the thickness percentage of the middle layer 2 is 70%, and the thickness percentage of the inner layer 3 is 15%.
The thickness percentage of the surface layer resin layer 4 is 85%, and the thickness percentage of the surface layer additive layer 5 is 15%.
The thickness percentage of the middle resin layer 6 is 90%, and the thickness percentage of the middle additive layer 7 is 10%.
The inner resin layer 8 had a thickness percentage of 95% and the inner additive layer 9 had a thickness percentage of 5%.
The quadruple controlled degradation (SCZJ) additive, the oxygen-containing polymer material controlled degradation (JHZJ) additive and the oxygen-containing resin controlled degradation (YZJ) additive are all as follows: nickel dithiocarbamate.
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;
the starch is a natural high molecular material with rich sources and low price, the natural starch exists in a small particle state with a crystal structure inside, and the molecular structure of the natural starch has two types of straight chain and branched chain. 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; the other is heating in a closed state, and the water content of plastication extrusion is less than 28 percentThe starch of (4).
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 high-barrier composite membrane 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 quintuple controlled degradation (WCSZ) resin, and the surface additive layer is quadruple controlled degradation (SCZJ) 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 polybutylene succinate (SHQ-MBS) resin, and the middle layer additive layer is an oxygen-containing polymer material controllable degradation (JHZJ) additive;
the inner layer comprises an inner resin layer and an inner additive layer, the inner additive layer is positioned below the inner resin layer, the inner resin layer is modified polypropylene carbonate (SHQ-MPC) resin, and the inner additive layer is an oxygen-containing resin controlled degradation (YZZJ) additive.
2. The bio-based high-barrier composite membrane 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 high-barrier composite membrane 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 high-barrier composite membrane 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 high-barrier composite membrane 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 high-barrier composite membrane according to claim 1, wherein: the quadruple controlled degradation (SCZJ) additive, the oxygen-containing polymer material controlled degradation (JHZJ) additive and the oxygen-containing resin controlled degradation (YZJ) additive are all as follows: nickel dithiocarbamate.
CN201910479289.2A 2019-06-04 2019-06-04 Bio-based high-barrier composite membrane Withdrawn CN110614830A (en)

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Application publication date: 20191227