CN117445512A - Composite recyclable ton bag material and preparation method thereof - Google Patents

Composite recyclable ton bag material and preparation method thereof Download PDF

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Publication number
CN117445512A
CN117445512A CN202311378658.1A CN202311378658A CN117445512A CN 117445512 A CN117445512 A CN 117445512A CN 202311378658 A CN202311378658 A CN 202311378658A CN 117445512 A CN117445512 A CN 117445512A
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China
Prior art keywords
ton bag
bag material
layer
parts
aramid fiber
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Chinese (zh)
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余文俊
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Shanghai Tangke New Material Technology Co ltd
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Shanghai Tangke New Material Technology Co ltd
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Priority to CN202311378658.1A priority Critical patent/CN117445512A/en
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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
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of 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
    • B32B27/06—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
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • 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
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
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    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • 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
    • 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
    • B65D88/00—Large containers
    • B65D88/16—Large containers flexible
    • B65D88/1606—Large containers flexible double-walled or with linings
    • 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
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • B65D90/022—Laminated structures
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C08L23/0853—Vinylacetate
    • C08L23/0861—Saponified vinylacetate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08L27/08—Homopolymers or copolymers of vinylidene chloride
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B32B2262/0269—Aromatic polyamide fibres
    • 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
    • B32B2307/554—Wear resistance
    • 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
    • B32B2307/7244—Oxygen barrier
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/02—Open containers
    • B32B2439/06—Bags, sacks, sachets
    • 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
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/062—HDPE
    • 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
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

The application relates to the technical field of high polymer materials, and particularly discloses a composite recyclable ton bag material and a preparation method thereof. A composite recyclable ton bag material comprises a POE layer, a base cloth, a PVDC layer and an EVOH layer which are sequentially arranged from top to bottom; the POE layer comprises the following components in parts by weight: 50-70 parts of POE; 15-20 parts of HDPE; 0.5-0.8 part of modified aramid fiber; the preparation method of the modified aramid fiber comprises the following steps: adding aramid fiber into the dopamine solution, regulating the pH to 8.5-9.5, mixing, adding a coupling agent, dispersing and drying to obtain the product. The utility model provides a but combined type cyclic utilization ton bag material, it has the advantage that the wearability is good to maintain long-term effectual separation nature, promote ton bag's life.

Description

Composite recyclable ton bag material and preparation method thereof
Technical Field
The application relates to the technical field of high polymer materials, in particular to a composite recyclable ton bag material and a preparation method thereof.
Background
The ton bag is also called a flexible transport packaging container, has the advantages of moisture resistance, dust resistance, radiation resistance, firmness and safety, and has enough strength structurally. One of the basic properties of packaging containers is the barrier properties of the material, which means the barrier properties of the material against penetration of substances such as oxygen, water vapor, air, organic gases, etc. from one side of the material to the other, and therefore, when the flexible container is used in the packaging of food, medicine, electronic devices, it is often desirable to have a higher barrier property.
At present, a high-barrier packaging material is provided, which is composed of a POE coating layer, a base cloth, a POE coating layer and an EVOH barrier coating layer which are sequentially arranged from top to bottom, and the gas barrier property of the packaging material is better by means of the characteristic that the POE material is poor in air permeability.
The POE layer is adhered to the surface of the ton bag, so that the barrier property of the ton bag can be improved, but the POE layer is more frictional when the ton bag is transported for a long time, and the POE layer is general in wear resistance, so that the excellent barrier property is difficult to ensure under long-term wear, and the service life of the ton bag is shortened.
Disclosure of Invention
In order to improve the wear resistance of the POE coating layer and further ensure that the ton bag has longer-time barrier property, the application provides a composite recyclable ton bag material and a preparation method thereof.
In a first aspect, the present application provides a composite recyclable ton bag material, which adopts the following technical scheme: a composite recyclable ton bag material comprises a POE layer, a base cloth, a PVDC layer and an EVOH layer which are sequentially arranged from top to bottom;
the POE layer comprises the following components in parts by weight:
50-70 parts of POE; 15-20 parts of HDPE; 0.5-0.8 part of modified aramid fiber;
the preparation method of the modified aramid fiber comprises the following steps: adding aramid fiber into the dopamine solution, regulating the pH value to 8.5-9.5, mixing, adding a coupling agent, dispersing, and drying to obtain the modified aramid fiber.
By adopting the technical scheme: the flexibility of the aramid fiber is high, the stress transmission in POE resin can be realized, and the wear resistance of the POE layer is improved through reinforcement; after the dopamine is added, the dopamine is wrapped under an alkaline condition and polymerized on the surface of the aramid fiber to form a polydopamine layer, and phenolic hydroxyl groups of the polydopamine layer react with a coupling agent, so that active functional groups such as hydroxyl groups are introduced on the surface of the aramid fiber, the interfacial bonding capability between the aramid fiber and POE is improved, and the wear resistance is further improved.
According to detection, when the modified aramid fiber is added, the oxygen transmission amount difference of the ton bag material after friction is only 2.58cm 3 /m 2 D.bar, when unmodified aramid fiber is added, the oxygen transmission rate of the ton bag material after friction is up to 4.79cm 3 /m 2 D.bar, which shows that the modified aramid fiber can obviously reduce the lifting amplitude of the oxygen transmission amount after friction, namely, the abrasion resistance is better, and the service life of the ton bag is prolonged.
Optionally, the concentration of dopamine in the dopamine solution is 2.5-3g/L.
By adopting the technical scheme: the polymerization rate of dopamine is related to the concentration thereof, and the polymerization rate is higher as the concentration of dopamine is higher within a certain range, and when the concentration of dopamine is higher than the above range, the polymer structure is unstable and is easy to fall off, so that when the concentration of dopamine is within the above range, the obtained modified aramid fiber has the best synergistic effect on the POE layer.
The polymerization rate of dopamine is related to the concentration thereof, and in a certain range, the higher the concentration of dopamine is, the faster the polymerization rate is, and in a range larger than the above range, the polymer is easily peeled off due to unstable structure, and the abrasion resistance of the ton bag is further improved.
Optionally, squalene is added in the process of adding aramid fiber into the dopamine solution, wherein the weight ratio of squalene to the dopamine solution is (0.04-0.06): 1.
By adopting the technical scheme: however, the formation speed of the polydopamine layer is low, the efficiency is low, and the complete polymerization of dopamine is difficult to ensure when the mixing time is shortened, so that the coating effect and the efficiency are not compatible; therefore, squalene is further added, probably because the squalene reacts with oxygen in the air to release a large amount of active hydroxyl free radicals to induce dopamine to form semi-quinone free radicals, and the polymerization efficiency of dopamine can be improved.
Through detection, under the condition of equivalent mixing time, the oxygen transmission rate difference value of the ton bag is 2.36cm at the lowest when squalene is not added 3 /m 2 D.d.bar, the squalene is added to obviously reduce the oxygen transmission capacity difference after static friction of ton bags to 1.77-1.95cm 3 /m 2 D.bar, which shows that under the same time, the dopamine is polymerized more completely, the synergistic effect of the modified aramid fiber on the ton bag is better, and a certain hint is provided for shortening the preparation time of the modified aramid fiber.
Optionally, in the preparation process of the modified aramid fiber, the mixing conditions are as follows: stirring and mixing at 25-30deg.C for 0.4-0.6 hr.
By adopting the technical scheme: because the dopamine coating effect is better, when the mixing time is shortened to be within the range, the oxygen transmission amount difference value of the ton bag material after friction is not obviously improved, the use requirement can be met, and the efficiency is obviously improved.
Optionally, the PVDC layer comprises the following components in parts by weight:
50-65 parts of PVDC;
10-15 parts of EEA;
10-15 parts of PP-g-MAH.
By adopting the technical scheme: PP-g-MAH is added as a compatilizer, so that the compatibility among the components is improved, and the performance of the PVDC layer is optimal.
Optionally, the preparation raw materials of the EVOH layer comprise the following components in parts by weight:
50-70 parts of EVOH;
10-15 parts of HDPE;
10-15 parts of LLDPE;
10-15 parts of PP-g-MAH.
By adopting the technical scheme: EVOH has extremely high gas barrier property, high mechanical strength, elasticity, surface hardness, abrasion resistance and weather resistance, and has strong antistatic property; HDPE has good barrier property to water vapor and air, low water absorption and good wear resistance, but has poor ageing resistance and is easy to crack; LLDPE has better environmental stress cracking resistance, impact resistance, tear strength and other properties; the combination of the three components ensures that the comprehensive performance of the prepared EVOH layer is better, and the prepared ton bag has the mechanical property and the barrier property of making friends.
Optionally, the EVOH has an ethylene molar fraction ranging from 27 to 38mol%.
By adopting the technical scheme: when the ethylene content is within the above range, the gas barrier property and processability of the EVOH layer produced are balanced, and when the content is increased, the gas barrier effect of the EVOH layer is decreased, and when the content is decreased, the processability of the EVOH layer is decreased, which also results in a decrease in the barrier effect of the EVOH layer.
Optionally, the base fabric is nylon woven fabric, the warp density is 12-13 pieces/5 cm, and the weft density is 12-13 pieces/5 cm.
In a second aspect, the present application provides a method for preparing a composite recyclable ton bag material, which adopts the following technical scheme:
a preparation method of a composite recyclable ton bag material comprises the following steps:
s1, adding the preparation raw materials of the POE layer into an extruder, carrying out melt extrusion, then thermally compounding the melt extrusion on the base fabric, and cooling and shaping;
s2, melting the preparation raw materials of the PVDC layer and then carrying out double-layer coextrusion to form a composite film;
and S3, placing the composite membrane on the side surface of the base fabric, which is far away from the POE layer, carrying out hot pressing compounding, cooling and shaping to obtain the composite recyclable ton bag material.
By adopting the technical scheme: the ton bag material which is composed of the POE layer, the base cloth, the PVDC layer and the EVOH layer from top to bottom is prepared, and the barrier property and the mechanical property of the material meet the use requirement, especially the wear resistance is more outstanding, so that the ton bag material has longer service life.
In summary, the present application has the following beneficial effects:
1. according to the method, the modified aramid fiber is added, the polydopamine layer is formed on the surface of the aramid fiber by using the dopamine, and then the phenolic hydroxyl group in the polydopamine layer reacts with the coupling agent, so that an active functional group is introduced on the surface of the aramid fiber, the interfacial bonding capability of the aramid fiber and the POE layer is improved, the synergistic effect on the wear resistance of the ton bag is further improved, and the long-term effective blocking effect and the service life of the ton bag are ensured;
2. in the preparation process of the modified aramid fiber, squalene is added, and the squalene reacts with oxygen in the air to generate a large number of active hydroxyl free radicals, so that dopamine is induced to form semi-quinone free radicals, the effect of improving the polymerization efficiency of the dopamine is improved, and a better modification effect is obtained in the same reaction time;
3. due to the fact that the polymerization efficiency of dopamine is improved, the preparation time of the modified aramid fiber is shortened, the preparation efficiency is improved, and the modified aramid fiber is beneficial to industrial preparation and application to ton bag materials.
Detailed Description
The present application is described in further detail below with reference to examples.
Preparation example 1
The modified aramid fiber is prepared from the following components and corresponding weights shown in table 1:
adding dopamine hydrochloride into water, stirring and mixing to obtain 2g/L dopamine solution for later use; adding the aramid fiber into acetone with the volume being 10 times that of the aramid fiber, washing for 3 times at 40kHz for 30min each time, then taking out the aramid fiber, washing with water with the volume being 2 times that of the aramid fiber, putting into an oven, and drying for 30min at the temperature of 30 ℃ to obtain the pretreated aramid fiber for later use.
Adding pretreated aramid fiber into dopamine solution, adding Tris to adjust the pH to 8.5, mixing (stirring and mixing at 25 ℃ for 1.5 h), adding coupling agent KH560, dispersing (stirring and mixing at 50 ℃ for 1 h), filtering to remove filtrate, and drying the filtered product at 30 ℃ for 30min to obtain the novel dopamine.
Aramid fiber: a tensile strength of 2900MPa, an elongation of 2.5%, a density of 1.42g/cm and an average length of 1mm; tris is Tris (hydroxymethyl) aminomethane.
It should be noted that: the pH value adjusted after Tris addition can be selected in the range of 8.5-9.5, and can be specifically 8.5, 8.6, 8.7, 8.8, 8.9, 9.0, 9.1, 9.2, 9.3, 9.4 and 9.5, wherein the selection does not greatly influence the performance of the modified aramid fiber, and only 8.5 is taken as an example for brief description in the embodiment of the application, but other pH values are not influenced in the application.
PREPARATION EXAMPLES 2 to 4
The modified aramid fiber is different from the preparation example 1 in the concentration of the dopamine solution, and specifically comprises the following steps:
preparation example 2
The concentration of dopamine hydrochloride in the dopamine solution is 2.5g/L.
Preparation example 3
The concentration of dopamine hydrochloride in the dopamine solution is 2.7g/L.
Preparation example 4
The concentration of dopamine hydrochloride in the dopamine solution is 3g/L.
Preparation examples 5 to 7
The modified aramid fiber is different from the preparation example 3 in that squalene is further added during the addition of the pretreated aramid fiber to the dopamine solution, and the addition amount of squalene is shown in table 1.
TABLE 1 preparation examples 1, 3, 5-7, the components and their weights (kg)
Preparation examples 8 to 10
The modified aramid fiber is different from preparation example 6 in that the mixing conditions after the adjustment of pH by adding Tris are different, specifically as follows: preparation example 8
Mix under stirring at 25℃for 0.6h.
Preparation example 9
Mix under stirring at 27℃for 0.5h.
Preparation example 10
Mix under stirring at 30℃for 0.4h.
Example 1
A composite recyclable ton bag material comprises a POE layer, a base cloth, a PVDC layer and an EVOH layer which are sequentially arranged from top to bottom; the components in each layer and their corresponding weights are shown in table 2 and are prepared by the following steps:
s1, adding the preparation raw materials of the POE layer into an extruder, controlling the temperature to 170 ℃, melting and extruding to form a flaky melt, thermally compounding the melt onto a base fabric through a compression roller (the hot pressing temperature is 120 ℃, the time is 4S, the pressure is 9 kg), cooling and shaping through a cooling roller, forming the POE layer on the surface of the base fabric, and controlling the thickness of the POE layer to be 0.15mm;
s2, respectively adding the preparation raw materials of the PVDC layer and the preparation raw materials of the EVOH layer into two die cavities of a double-layer co-extrusion die head, carrying out double-layer co-extrusion on the fused melt, controlling the temperature at 240 ℃ to form a composite film, and controlling the thickness of the PVDC layer and the EVOH layer in the composite film to be 0.1mm and 0.01mm;
s3, placing the composite film on the side surface of the base fabric far away from the POE layer, performing hot-pressing compounding (the temperature is 120 ℃, the time is 3S, the pressure is 10 kg), and cooling and shaping by a cooling roller to obtain the composite film.
Wherein the base fabric is nylon woven cloth, the warp density is 12 pieces/5 cm, the weft density is 12 pieces/5 cm, and the gram weight is 170g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The modified aramid fiber is prepared in preparation example 1; POE is polyolefin elastomer, obtained from Dongguan Baojia Plastic Co., ltd., trade name 8880; HDPE is high-density polyethylene, and is obtained from Ningbo core rain plasticization Co., ltd, and the brand DMDA-8008H; PVDC is polyvinylidene, and is obtained from Dongguan plastic Co., ltd, model XH4090YFHNMU; EEA is an ethylene-acrylic acid copolymer available from Shanghai Kingyuan plasticizing technology Co., ltd, trade name 2116AC; PP-g-MAH is maleic anhydride grafted polyethylene, and is obtained from Dongguan Shangshan brand new material and technology Co., ltd, model P613; EVOH is an ethylene/vinyl alcohol copolymer obtained from Dongguan Chensig Plastic Material Co., ltd, model E105B, and has an ethylene mole fraction of 44mol%; LLDPE is low density polyethylene, and is obtained from Shanghai bridge micro chemical technology Co., ltd, and the brand is DFDA-7042.
TABLE 2 Components of examples 1-3 and comparative examples 1-2 and weights (kg)
Comparative example 3
A ton bag material differs from example 1 in that an equivalent amount of aramid fibers is used instead of modified aramid fibers.
Examples 4 to 12
The composite recyclable ton bag material is different from example 2 in that the use condition of the modified aramid fiber is shown in table 3, but the addition amount of the modified aramid fiber in the POE layer is not changed.
Table 3 Table of the use cases of the modified aramid fibers in examples 4 to 12
Examples 4 5 6 7 8 9 10 11 12
Preparation example of modified aramid fiber 2 3 4 5 6 7 8 9 10
Examples 13 to 18
A composite recyclable ton bag material differs from example 11 in the amount of components used in each layer, and the components and their corresponding weights in each layer are shown in table 4.
Table 4 the components and weights (kg) thereof in examples 13 to 18
Examples 19 to 21
The composite recyclable ton bag material differs from example 17 in the molar fraction of ethylene in EVOH, specifically as follows:
example 19
The ethylene mole fraction in EVOH was 38 mole%.
Example 20
The ethylene mole fraction in EVOH was 32mol%.
Example 21
The ethylene mole fraction in EVOH was 27mol%.
Example 22
The composite recyclable ton bag material differs from example 20 in the precision of the base fabric, which is 13 pieces per 5cm, and the weft density of 13 pieces per 5cm.
Performance detection
The ton bag materials prepared in examples and comparative examples were subjected to the following performance tests, and the test results are recorded in table 5.
Detection method
1. Abrasion resistance: detecting oxygen transmission quantity Q1 of ton bag material according to GB/T1038-2000, and unit cm 3 /m 2 D.bar; the method is operated according to the inclined plane method of GB/T20859-2007, so that the surface of the ton bag material attached with the POE layer is worn, the oxygen transmission quantity Q2 of the ton bag material after being worn is detected according to GB/T1038-2000, the oxygen transmission quantity difference value between the ton bag material after being worn and the ton bag material before being worn is calculated according to the following formula, and the lower Q3 is recorded as Q3, the better the wear resistance of the material is, and the higher barrier property can be ensured under the same wear.
Q3＝Q2-Q1。
2. Tensile load: the longitudinal tensile load of the ton bag material is detected according to GB/T1040.3-2006, the test sample in the test is in a strip shape, the space between clamps is 150mm, the width is 50mm, and the test speed is 200mm/min.
TABLE 5 Performance test results
Referring to Table 5, in example 1, the oxygen transmission amount difference after friction was only 2.58cm by using the modified aramid fiber obtained in preparation example 1 3 /m 2 D.bar, whereas in comparative example 3, the oxygen transmission of the ton bag material obtained by rubbing was as high as 4.79cm due to the use of unmodified aramid fibers 3 /m 2 D.bar, showing that the abrasion resistance of the material is significantly improved by adding modified aramid fibers in the present application, the analysis may be that:
under alkaline conditions, dopamine in the modified aramid fiber wraps the surface of the aramid fiber and forms a polydopamine layer, phenolic hydroxyl groups in the polydopamine layer react with a coupling agent, so that active functional groups such as hydroxyl groups and the like are introduced into the surface of the aramid fiber, the interfacial bonding capability between the aramid fiber and POE is improved, the reinforcing effect of the aramid fiber is fully exerted, and the wear resistance of the POE layer is further improved.
Examples 2 to 3 and comparative examples 1 to 2 differ from example 1 in the amounts of the respective components used, and as can be seen from Table 5, when the amounts are within the ranges of examples 1 to 3, the performance of the produced ton bag material is excellent.
Examples 4-6 differ from example 2 in that in the preparation of the modified aramid fiber, the dopamine concentration was increased progressively, and the difference in oxygen transmission of the ton bag material after friction was reduced to a minimum of less than 2.36cm 3 /m 2 D.bar, further improvement of the abrasion resistance.
Examples 7 to 9 are different from example 5 in that squalene is added in the preparation process of the modified aramid fiber, and the difference of oxygen transmission rate of the ton bag material after friction is obviously reduced to be 1.77 cm to 1.95cm 3 /m 2 D.bar. Because the mixing time is only 1.5h, the coating effect caused by the fact that dopamine fails to polymerize completely still has a further improvement space, and the added squalene can remarkably improve the polymerization efficiency of dopamine so as to improve the coating effect, so that the quantity of active groups introduced on the surface of the aramid fiber is improved, the modification effect is improved, the difference is reduced, and the analysis of the reasons is probably that:
the squalene reacts with oxygen in the air to generate and release a large amount of active hydroxyl free radicals, so that the dopamine is induced to form semi-quinone free radicals, and the polymerization efficiency of the dopamine can be improved.
Examples 10-12 differ from example 8 in that the mixing time during the preparation of the modified aramid fiber is shortened, and the oxygen transmission difference of the prepared ton bag material after friction is not significantly improved, which indicates that the dopamine polymerization degree can be more complete within 0.4-0.6h after squalene is added, the polymerization time is greatly shortened, and the efficiency is improved.
Examples 13-15 differ from example 11 in that the PVDC layer has compatibilizing agent PP-g-MAH added therein, which has better compatibility among the components and improves the overall performance of the ton bag material.
Examples 16-18 differ from example 14 in that the amount of each component in the EVOH layer is different, LLDPE is added and the resulting ton bag has better abrasion resistance.
Examples 19-21 differ from example 15 in that the molar fraction of ethylene in the EVOH layer is reduced, the barrier properties of the produced ton bag material are enhanced, but the resistance is not significantly improved, so that the difference in oxygen transmission after rubbing is not significantly reduced.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.

Claims (9)

1. The composite recyclable ton bag material is characterized by comprising a POE layer, a base cloth, a PVDC layer and an EVOH layer which are sequentially arranged from top to bottom;
the POE layer comprises the following components in parts by weight:
50-70 parts of POE; 15-20 parts of HDPE; 0.5-0.8 part of modified aramid fiber;
the preparation method of the modified aramid fiber comprises the following steps: adding aramid fiber into the dopamine solution, regulating the pH value to 8.5-9.5, mixing, adding a coupling agent, dispersing, and drying to obtain the modified aramid fiber.
2. A composite reusable ton bag material as in claim 1, wherein: the concentration of dopamine in the dopamine solution is 2.5-3g/L.
3. A composite reusable ton bag material as in claim 1, wherein: in the process of adding the aramid fiber into the dopamine solution, squalene is also added, and the weight ratio of the squalene to the dopamine solution is (0.04-0.06): 1.
4. A composite reusable ton bag material as in claim 1, wherein: in the preparation process of the modified aramid fiber, the mixing conditions are as follows: stirring and mixing at 25-30deg.C for 0.4-0.6 hr.
5. A composite reusable ton bag material as in claim 1, wherein: the PVDC layer comprises the following components in parts by weight:
50-65 parts of PVDC;
10-15 parts of EEA;
10-15 parts of PP-g-MAH.
6. A composite reusable ton bag material as in claim 1, wherein: the EVOH layer is prepared from the following raw materials in parts by weight:
50-70 parts of EVOH;
10-15 parts of HDPE;
10-15 parts of LLDPE;
10-15 parts of PP-g-MAH.
7. A composite reusable ton bag material as in claim 6, wherein: the EVOH has an ethylene mole fraction of 27-38mol%.
8. A composite reusable ton bag material as in claim 1, wherein: the base cloth is nylon woven cloth, the warp density is 12-13 pieces/5 cm, and the weft density is 12-13 pieces/5 cm.
9. A method of making a composite reusable ton bag material according to any one of claims 1-8, comprising the steps of:
s1, adding the preparation raw materials of the POE layer into an extruder, carrying out melt extrusion, then thermally compounding the melt extrusion on the base fabric, and cooling and shaping;
s2, melting the preparation raw materials of the PVDC layer and then carrying out double-layer coextrusion to form a composite film;
and S3, placing the composite membrane on the side surface of the base fabric, which is far away from the POE layer, carrying out hot pressing compounding, cooling and shaping to obtain the composite recyclable ton bag material.
CN202311378658.1A 2023-10-24 2023-10-24 Composite recyclable ton bag material and preparation method thereof Pending CN117445512A (en)

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CN112322064A (en) * 2020-11-12 2021-02-05 东北林业大学 Method for reinforcing wood powder/polyolefin composite material by using surface-treated continuous aramid fiber
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