CN111138748A - Waterproof and antibacterial packaging film and preparation process thereof - Google Patents

Waterproof and antibacterial packaging film and preparation process thereof Download PDF

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Publication number
CN111138748A
CN111138748A CN201911331326.1A CN201911331326A CN111138748A CN 111138748 A CN111138748 A CN 111138748A CN 201911331326 A CN201911331326 A CN 201911331326A CN 111138748 A CN111138748 A CN 111138748A
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waterproof
stirring
packaging film
antibacterial
rotating shaft
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不公告发明人
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
    • B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
    • B29B7/12—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft
    • B29B7/14—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft with screw or helix
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
    • B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
    • B29B7/12—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft
    • B29B7/16—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft with paddles or arms
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/22—Component parts, details or accessories; Auxiliary operations
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/82—Heating or cooling
    • B29B7/826—Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
    • C08H8/00—Macromolecular compounds derived from lignocellulosic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0633—LDPE, i.e. low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/04—Polyesters derived from hydroxycarboxylic acids
    • B29K2067/046—PLA, i.e. polylactic acid or polylactide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
    • 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
    • C08J2400/00—Characterised by the use of unspecified polymers
    • C08J2400/16—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
    • C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
    • C08J2405/04—Alginic acid; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2489/00—Characterised by the use of proteins; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2497/00—Characterised by the use of lignin-containing materials
    • C08J2497/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • 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
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
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    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2248—Oxides; Hydroxides of metals of copper
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
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    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
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    • C08K2003/328—Phosphates of heavy metals
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  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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Abstract

The invention discloses a waterproof and antibacterial packaging film and a preparation process thereof, belonging to the technical field of packaging materials. The waterproof and antibacterial packaging film disclosed by the invention takes low-density polyethylene, polylactic acid and modified bamboo fiber as main raw materials, has a good waterproof and oxygen-insulating function, is biodegradable, has no pollution to the environment, has continuous antibacterial capability, and inhibits or prevents the growth of microorganisms. The preparation process of the invention has simple flow, film formation by an extrusion casting method, processing by a multi-layer co-extrusion method, small equipment investment and suitability for large-scale industrial production.

Description

Waterproof and antibacterial packaging film and preparation process thereof
Technical Field
The invention relates to the technical field of packaging materials, in particular to a waterproof and antibacterial packaging film and a preparation process thereof.
Background
The safety and sanitation of food and medicine are directly closely related to the life health of people, so that the selection of proper packaging materials is one of the important links for ensuring the quality of food and medicine. The barrier properties of packaging materials are critical factors affecting the packaging effect, and the main causes of the deterioration of the packaging contents are the attack by moisture and oxygen, the exposure to visible light and the contamination by microorganisms. The water causes the microorganism to breed, the oxygen causes the content to be oxidized and deteriorated, and partial food and medicine are decomposed and lose efficacy when exposed to light. The barrier property of the packaging material is good, so that the original characteristics of the contents can be kept; otherwise, the contents may be deteriorated by inhalation of moisture and oxygen in the air, or a photodecomposition reaction may occur, resulting in food spoilage or drug failure.
Typically, the outer skin layer of the packaging film is polyethylene or polypropylene and the barrier layer is ethylene-vinyl alcohol copolymer or polyamide. The outer surface layer is only composed of C, H elements and does not contain polar elements; while the barrier layer is a polar polymer, which has poor adhesion to the outer skin layer. To improve the adhesion between the outer skin and the barrier layer, a binder (e.g., ethylene-vinyl acetate copolymer or maleic anhydride modified ethylene polymer) is typically added. Therefore, the packaging film is usually processed by a multilayer co-extrusion method, so that the equipment investment is large, the production process is complex, and the production cost of the packaging film is high.
Disclosure of Invention
1. Technical problem to be solved
The waterproof and antibacterial packaging film takes low-density polyethylene, polylactic acid and modified bamboo fiber as main raw materials, has good waterproof and oxygen-insulating functions, can be biodegraded, has no pollution to the environment, has continuous antibacterial capability, and inhibits or prevents the growth of microorganisms. The preparation process of the invention has simple flow, film formation by an extrusion casting method, processing by a multi-layer co-extrusion method, small equipment investment and suitability for large-scale industrial production.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A waterproof and antibacterial packaging film comprises the following components in parts by weight:
100 portions of low-density polyethylene, 60 to 80 portions of polylactic acid, 30 to 40 portions of modified bamboo fiber, 0.2 to 0.4 portion of calcium carbonate, 0.2 to 0.4 portion of oleic acid, 0.4 to 1 portion of alginate, 0.2 to 0.6 portion of antibacterial agent and 0.5 to 2.5 portions of waterproofing agent.
Further, the raw materials of the modified bamboo fiber comprise bamboo fiber, acetic anhydride, propionic acid and acetic acid, and the preparation method of the modified bamboo fiber comprises the following steps: putting the bamboo fiber into toluene, carrying out ultrasonic treatment, sequentially adding propionic acid, acetic acid and acetic anhydride, stirring, then pouring into an ethanol solution to generate a precipitate, centrifuging, then washing with distilled water, and carrying out vacuum freeze drying to obtain the modified bamboo fiber.
Further, the alginate is formed by mixing calcium alginate, potassium alginate and sodium alginate, wherein the mass ratio of the calcium alginate to the potassium alginate to the sodium alginate is (2-5): 2-5: 2-5.
Further, the antibacterial agent comprises the following components in parts by weight: 22-26 parts of zirconium phosphate powder, 18-22 parts of zeolite powder, 16-20 parts of copper oxide powder, 14-18 parts of silver oxide powder, 12-16 parts of heavy calcium carbonate powder, 8-12 parts of nano titanium dioxide and 1-3 parts of mineral filler.
Further, the mineral filler is a mixture of the perilla glory stone powder, the cross stone powder and the eudragite powder according to the weight ratio of 5:2:1, wherein the particle sizes of the perilla glory stone powder, the cross stone powder and the eudragite powder are 100-200 meshes.
Further, the waterproof agent is formed by mixing soybean protein isolate, zein and wheat gluten, wherein the mass ratio of the soybean protein isolate to the zein to the wheat gluten is 1-3: 1-3: 1-3.
A preparation process of a waterproof and antibacterial packaging film comprises the following steps:
s1, preparing raw materials of the components according to the weight portion: low-density polyethylene, polylactic acid, modified bamboo fiber, calcium carbonate, oleic acid, alginate, an antibacterial agent and a waterproof agent;
s2, placing the low-density polyethylene, the polylactic acid, the modified bamboo fiber, the calcium carbonate, the oleic acid, the alginate, the antibacterial agent and the waterproof agent into a mixing device, and mixing for 15-20min at 50-100rpm to obtain a mixed material;
s3, adding the mixed material into a double-screw extrusion granulator, and carrying out extrusion granulation to obtain raw material particles;
s4, feeding the raw material particles into an extruder to form a film at the temperature of 80-160 ℃ so as to obtain the waterproof and antibacterial packaging film.
Further, the mixing device comprises a machine body, a mixing barrel is arranged in the machine body, the mixing barrel and the machine body are coaxially arranged, a feeding port is formed in the left end of the upper side of the mixing barrel, a support column is fixed in the center of the inner wall of the lower side of the machine body, the bottom end of the mixing barrel is fixed on the support column, a bearing is arranged at the contact position of the mixing barrel and the support column, a stirring rotating shaft is vertically arranged in the mixing barrel, a driving motor is arranged on the upper side of the machine body, the top end of the stirring rotating shaft extends out of the top end of the machine body and is connected with the driving motor, a first stirring blade is arranged on the stirring rotating shaft and is a spiral stirring blade, a gear transmission mechanism is arranged at the connection position of the stirring rotating shaft and the mixing barrel, a connecting block is arranged between the gear transmission mechanism and the first stirring blade on the, the equal welded connection in the left and right sides of connecting block has the connecting rod, the tip of connecting rod all is equipped with the puddler, be equipped with the second stirring vane that the symmetry set up on the outer wall of puddler, it has third stirring vane to go back evenly distributed on the inner wall of compounding section of thick bamboo, second stirring vane and third stirring vane are crisscross the setting from top to bottom, the bottom of compounding section of thick bamboo is equipped with the discharge gate and is equipped with the bleeder valve on the discharge gate, is connected with the discharging pipe in the right side bottom of organism.
Further, gear drive constructs including the cover establish the external gear on stirring pivot outer wall and fix the internal gear that sets up side wall axle center department on the mixing barrel, external gear and internal gear coaxial and coplanar set up, be equipped with drive gear between external gear and the internal gear, drive gear is connected with external gear and internal gear meshing respectively.
Further, a rotating shaft cooling mechanism is arranged between the driving motor and the machine body, the rotating shaft cooling rotating shaft is arranged on the outer wall of the stirring rotating shaft and comprises a cover body, an air inlet is formed in the left side of the cover body, a condenser is arranged at the air inlet, a filter screen is fixedly connected to the air inlet, an air outlet is formed in the right side of the cover body and corresponds to the air inlet, a fan is arranged at the air outlet, a shaft sleeve is sleeved on one section of outer wall, located on the cover body, of the stirring rotating shaft, an air guide shaft is connected to the left side of the shaft sleeve, the left end of the air guide shaft is arranged right opposite to the air inlet, and spiral air guide plates are spirally distributed.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the waterproof and antibacterial packaging film disclosed by the invention takes low-density polyethylene, polylactic acid and modified bamboo fiber as main raw materials, and calcium carbonate, alginate, an antibacterial agent, a waterproof agent and other auxiliary materials as auxiliary materials, has a good waterproof and oxygen-insulating function, is biodegradable, has no pollution to the environment, has continuous antibacterial capability, and inhibits or prevents the growth of microorganisms. The preparation process has simple process flow, film formation by an extrusion casting method, processing by a multi-layer co-extrusion method, small equipment investment and suitability for large-scale industrial production.
(2) The antibacterial modifier is added into the waterproof antibacterial packaging film, the antibacterial modifier comprises a plurality of antibacterial agents and mineral fillers, the mineral fillers are a mixture of perilla pumice powder, cross stone powder and feldspar powder, the mineral fillers play a filling role in the packaging film, the antibacterial agents are tightly connected, the antibacterial agents act together to play a role in keeping consistency, and the sterilization effect is greatly enhanced.
(3) The modified bamboo fibers are added into the waterproof and antibacterial packaging film, so that the packaging film has good degradability, the pollution of the packaging film to the environment is effectively reduced, and in the modification process of the modified bamboo fibers, the surface acetylation and the length-diameter ratio of the bamboo fibers are reduced, so that the lipophilicity of the bamboo fibers is improved, the compatibility of the bamboo fibers and a polymer is improved, and the toughness of the packaging film is improved.
(4) When using the compounding device, put into the material mixing section of thick bamboo inside, driving motor drives the (mixing) shaft rotation, and first stirring vane and second stirring vane stir the material and mix, the effectual material mixing efficiency that has improved, after the compounding, carry out the ejection of compact through discharging pipe and bleeder valve cooperation.
(5) Owing to set up gear drive, can drive the mixing barrel simultaneously rotatory, and the rotation opposite direction of mixing barrel and stirring pivot to drive third stirring vane counter rotation, through first stirring vane, second stirring vane and the cooperation stirring of third stirring vane, great improvement stirring effect, make the stirring mix more abundant, and three stirring vane is by a motor drive, great saving the energy, reduced production and use cost.
(6) The fan is internal with outside air by the air inlet suction cover, cool down through the condenser and become the cold air, the cold air can directly cool off stirring pivot on the one hand, on the other hand cooling air guide shaft and axle sleeve, the heat of stirring pivot can be absorbed to refrigerated air guide shaft and axle sleeve, further cool off the stirring pivot, the contact time of long cold air and air guide shaft can be followed to the spiral aviation baffle, guarantee the refrigerated effect of air guide shaft and axle sleeve, thereby guarantee the two heat absorption effect to the stirring pivot, the effectual life who prolongs the stirring pivot, the use and the maintenance cost of compounding device have been reduced, and need not to shut down and cool down, and the work efficiency is improved.
Drawings
FIG. 1 is a flow chart of the manufacturing process of the present invention;
FIG. 2 is a schematic structural view of a mixing device according to the present invention;
FIG. 3 is a schematic structural view of a gear transmission mechanism of the mixing device of the present invention;
FIG. 4 is a schematic structural diagram of a cooling mechanism for a rotating shaft of a mixing device according to the present invention.
The reference numbers in the figures illustrate:
1 machine body, 2 mixing barrels, 3 material inlet ports, 4 support columns, 5 stirring rotating shafts, 6 gear transmission mechanisms, 601 external gears, 602 internal gears, 603 transmission gears, 7 driving motors, 601 external gears, 602 internal gears, 603 transmission gears, 8 rotating shaft cooling mechanisms, 81 cover bodies, 82 air inlet ports, 83 filter screens, 84 condensers, 85 shaft sleeves, 86 air guide shafts, 87 spiral air guide plates, 88 fans, 89 air outlet ports, 9 connecting blocks, 10 connecting rods, 11 first stirring blades, 12 stirring rods, 13 second stirring blades, 14 third stirring blades, 15 material outlet ports and 151 material outlet pipes.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
a waterproof and antibacterial packaging film comprises the following components in parts by weight:
100 portions of low-density polyethylene, 60 to 80 portions of polylactic acid, 30 to 40 portions of modified bamboo fiber, 0.2 to 0.4 portion of calcium carbonate, 0.2 to 0.4 portion of oleic acid, 0.4 to 1 portion of alginate, 0.2 to 0.6 portion of antibacterial agent and 0.5 to 2.5 portions of waterproofing agent.
The raw materials of the modified bamboo fiber comprise bamboo fiber, acetic anhydride, propionic acid and acetic acid, and the preparation method of the modified bamboo fiber comprises the following steps: putting the bamboo fiber into toluene, carrying out ultrasonic treatment, sequentially adding propionic acid, acetic acid and acetic anhydride, stirring, then pouring into an ethanol solution to generate a precipitate, centrifuging, then washing with distilled water, and carrying out vacuum freeze drying to obtain the modified bamboo fiber.
The alginate is formed by mixing calcium alginate, potassium alginate and sodium alginate, wherein the mass ratio of the calcium alginate to the potassium alginate to the sodium alginate is (2-5): 2-5: 2-5.
The antibacterial agent comprises the following components in parts by weight: 22-26 parts of zirconium phosphate powder, 18-22 parts of zeolite powder, 16-20 parts of copper oxide powder, 14-18 parts of silver oxide powder, 12-16 parts of heavy calcium carbonate powder, 8-12 parts of nano titanium dioxide and 1-3 parts of mineral filler.
The mineral filler is a mixture of perilla glorionite powder, cross-stone powder and eudragite powder according to the weight ratio of 5:2:1, wherein the particle sizes of the perilla glorionite powder, the cross-stone powder and the eudragite powder are 100-200 meshes.
The waterproof agent is prepared by mixing soybean protein isolate, zein and wheat gluten protein, wherein the mass ratio of the soybean protein isolate to the zein to the wheat gluten protein is 1-3: 1-3: 1-3.
Referring to fig. 1, a process for preparing a waterproof and antibacterial packaging film includes the following steps:
s1, preparing raw materials of the components according to the weight portion: low-density polyethylene, polylactic acid, modified bamboo fiber, calcium carbonate, oleic acid, alginate, an antibacterial agent and a waterproof agent;
s2, placing the low-density polyethylene, the polylactic acid, the modified bamboo fiber, the calcium carbonate, the oleic acid, the alginate, the antibacterial agent and the waterproof agent into a mixing device, and mixing for 15-20min at 50-100rpm to obtain a mixed material;
s3, adding the mixed material into a double-screw extrusion granulator, and carrying out extrusion granulation to obtain raw material particles;
s4, feeding the raw material particles into an extruder to form a film at the temperature of 80-160 ℃ so as to obtain the waterproof and antibacterial packaging film.
The waterproof and antibacterial packaging film disclosed by the invention takes low-density polyethylene, polylactic acid and modified bamboo fiber as main raw materials, and calcium carbonate, alginate, an antibacterial agent, a waterproof agent and other auxiliary materials as auxiliary materials, has a good waterproof and oxygen-insulating function, is biodegradable, has no pollution to the environment, has continuous antibacterial capability, and inhibits or prevents the growth of microorganisms.
The antibacterial modifier is added into the waterproof antibacterial packaging film, the antibacterial modifier comprises a plurality of antibacterial agents and mineral fillers, the mineral fillers are a mixture of perilla pumice powder, cross stone powder and feldspar powder, the mineral fillers play a filling role in the packaging film, the antibacterial agents are tightly connected, the antibacterial agents act together to play a role in keeping consistency, and the sterilization effect is greatly enhanced.
The modified bamboo fibers are added into the waterproof and antibacterial packaging film, so that the packaging film has good degradability, the pollution of the packaging film to the environment is effectively reduced, and in the modification process of the modified bamboo fibers, the surface acetylation and the length-diameter ratio of the bamboo fibers are reduced, so that the lipophilicity of the bamboo fibers is improved, the compatibility of the bamboo fibers and a polymer is improved, and the toughness of the packaging film is improved.
The preparation process has simple process flow, film formation by an extrusion casting method, processing by a multi-layer co-extrusion method, small equipment investment and suitability for large-scale industrial production.
Referring to fig. 2-4, the mixing device includes a machine body 1, a mixing barrel 2 is disposed inside the machine body 1, the mixing barrel 2 and the machine body 1 are coaxially disposed, a feeding port 3 is disposed at the left end of the upper side of the mixing barrel 2, a supporting column 4 is fixed at the center of the inner wall of the lower side of the machine body 1, the bottom end of the mixing barrel 2 is fixed on the supporting column 4, a bearing is disposed at the contact position of the mixing barrel 2 and the supporting column 4, a stirring rotating shaft 5 is vertically disposed inside the mixing barrel 2, a driving motor 7 is disposed on the upper side of the machine body 1, the top end of the stirring rotating shaft 5 extends out of the top end of the machine body 1 and is connected with the driving motor 7, a first stirring blade 11 is disposed on the stirring rotating shaft 5, the first stirring blade 11 is a spiral stirring blade, a gear transmission mechanism 6 is disposed at the connection position between the stirring, connecting block 9 welds on the outer wall of stirring pivot 5, the equal welded connection in the left and right sides of connecting block 9 has connecting rod 10, the tip of connecting rod 10 all is equipped with puddler 12, be equipped with the second stirring vane 13 that the symmetry set up on the outer wall of puddler 12, it has third stirring vane 14 to go back evenly distributed on the inner wall of compounding section of thick bamboo 2, second stirring vane 13 and third stirring vane 14 crisscross the setting from top to bottom, the bottom of compounding section of thick bamboo 2 is equipped with discharge gate 15 and is equipped with the bleeder valve on discharge gate 15, be connected with discharging pipe 151 in the right side bottom of organism 1.
When using the compounding device, put into mixing barrel 2 with the material inside, driving motor 7 drives (mixing) shaft 5 rotatory, and first stirring vane 11 and second stirring vane 13 stir the material and mix, the effectual material mixing efficiency that has improved, after the compounding, carry out the ejection of compact through discharging pipe 151 and bleeder valve cooperation.
The gear transmission mechanism 6 comprises an external gear 601 sleeved on the outer wall of the stirring rotating shaft 5 and an internal gear 602 fixed on the mixing barrel 2 and arranged on the axis of the upper side wall of the mixing barrel 2, the external gear 601 and the internal gear 602 are coaxially and coplanarly arranged, a transmission gear 603 is arranged between the external gear 601 and the internal gear 602, and the transmission gear 603 is respectively connected with the external gear 601 and the internal gear 602 in a meshing manner.
Owing to set up gear 6, can drive mixing barrel 2 simultaneously rotatory, and mixing barrel 2 is opposite with the direction of rotation of stirring pivot 5, thereby drive third stirring vane 14 counter-rotation, stir through first stirring vane 11, second stirring vane 13 and third stirring vane 14 cooperation, great improvement the stirring effect, it is more abundant to make the stirring mix, and three stirring vane is by a motor drive, great saving the energy, production and use cost have been reduced.
Be equipped with pivot cooling body 8 between driving motor 7 and the organism 1, pivot cooling body 8 sets up on the outer wall of stirring pivot 5, pivot cooling body 8 is including the cover body 81, air inlet 82 has been seted up on the cover body 81 left side, air inlet 82 department is equipped with condenser 84, air inlet 82 department still fixedly connected with filter screen 83, gas outlet 89 has been seted up with the corresponding position of air inlet 82 on the cover body 81 right side, gas outlet 89 department is provided with fan 88, stirring pivot 5 is located one section outer wall of the cover body 81 and overlaps and is equipped with axle sleeve 85, axle sleeve 85 left side is connected with air guide shaft 86, air guide shaft 86 left end is just setting up air inlet 82, air guide shaft 86's outer wall has spiral air deflector 87 along.
Fan 88 inhales the cover body 81 with the outside air by air inlet 82 in, it becomes cold air to cool down through condenser 84, cold air can direct cooling stirring pivot 5 on the one hand, on the other hand cooling air guide shaft 86 and axle sleeve 85, refrigerated air guide shaft 86 and axle sleeve 85 can absorb the heat of stirring pivot 5, further cool off stirring pivot 5, the contact time of long cold air and air guide shaft 86 can be followed to spiral aviation baffle 87, guarantee air guide shaft 86 and axle sleeve 85 refrigerated effect, thereby guarantee the two heat absorption effect to stirring pivot 5, the effectual life who prolongs stirring pivot 5, the use and the maintenance cost of compounding device have been reduced, and need not to shut down and cool down, and the work efficiency is improved.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.

Claims (10)

1. The utility model provides a waterproof fungi-proofing type packaging film which characterized in that: the paint comprises the following components in parts by weight:
100 portions of low-density polyethylene, 60 to 80 portions of polylactic acid, 30 to 40 portions of modified bamboo fiber, 0.2 to 0.4 portion of calcium carbonate, 0.2 to 0.4 portion of oleic acid, 0.4 to 1 portion of alginate, 0.2 to 0.6 portion of antibacterial agent and 0.5 to 2.5 portions of waterproofing agent.
2. The waterproof and antibacterial packaging film according to claim 1, characterized in that: the raw materials of the modified bamboo fiber comprise bamboo fiber, acetic anhydride, propionic acid and acetic acid, and the preparation method of the modified bamboo fiber comprises the following steps: putting the bamboo fiber into toluene, carrying out ultrasonic treatment, sequentially adding propionic acid, acetic acid and acetic anhydride, stirring, then pouring into an ethanol solution to generate a precipitate, centrifuging, then washing with distilled water, and carrying out vacuum freeze drying to obtain the modified bamboo fiber.
3. The waterproof and antibacterial packaging film according to claim 1, characterized in that: the alginate is formed by mixing calcium alginate, potassium alginate and sodium alginate, wherein the mass ratio of the calcium alginate to the potassium alginate to the sodium alginate is (2-5): 2-5: 2-5.
4. The waterproof and antibacterial packaging film according to claim 1, characterized in that: the antibacterial agent comprises the following components in parts by weight: 22-26 parts of zirconium phosphate powder, 18-22 parts of zeolite powder, 16-20 parts of copper oxide powder, 14-18 parts of silver oxide powder, 12-16 parts of heavy calcium carbonate powder, 8-12 parts of nano titanium dioxide and 1-3 parts of mineral filler.
5. The waterproof and antibacterial packaging film according to claim 4, wherein: the mineral filler is a mixture of perilla glorionite powder, cross-stone powder and eudragite powder according to the weight ratio of 5:2:1, wherein the particle sizes of the perilla glorionite powder, the cross-stone powder and the eudragite powder are 100-200 meshes.
6. The waterproof and antibacterial packaging film according to claim 1, characterized in that: the waterproof agent is formed by mixing soybean protein isolate, zein and wheat gluten protein, wherein the mass ratio of the soybean protein isolate to the zein to the wheat gluten protein is 1-3: 1-3: 1-3.
7. A process for preparing the waterproof and antibacterial packaging film according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
s1, preparing raw materials of the components according to the weight portion: low-density polyethylene, polylactic acid, modified bamboo fiber, calcium carbonate, oleic acid, alginate, an antibacterial agent and a waterproof agent;
s2, placing the low-density polyethylene, the polylactic acid, the modified bamboo fiber, the calcium carbonate, the oleic acid, the alginate, the antibacterial agent and the waterproof agent into a mixing device, and mixing for 15-20min at 50-100rpm to obtain a mixed material;
s3, adding the mixed material into a double-screw extrusion granulator, and carrying out extrusion granulation to obtain raw material particles;
s4, feeding the raw material particles into an extruder to form a film at the temperature of 80-160 ℃ so as to obtain the waterproof and antibacterial packaging film.
8. The preparation process of the waterproof and antibacterial packaging film according to claim 7, characterized in that: the mixing device comprises a machine body (1), a mixing barrel (2) is arranged in the machine body (1), the mixing barrel (2) and the machine body (1) are coaxially arranged, a feeding port (3) is formed in the left end of the upper side of the mixing barrel (2), a support column (4) is fixed in the center of the inner wall of the lower side of the machine body (1), the bottom end of the mixing barrel (2) is fixed on the support column (4), a bearing is arranged at the contact position of the mixing barrel (2) and the support column (4), a stirring rotating shaft (5) is vertically arranged in the mixing barrel (2), a driving motor (7) is arranged on the upper side of the machine body (1), the top end of the stirring rotating shaft (5) extends out of the top end of the machine body (1) and is connected with the driving motor (7), a first stirring blade (11) is arranged on the stirring rotating shaft (5), and the first stirring blade, a gear transmission mechanism (6) is arranged at the joint of the stirring rotating shaft (5) and the mixing barrel (2), a connecting block (9) is arranged between the gear transmission mechanism (6) and the first stirring blade (11) on the outer wall of the stirring rotating shaft (5), the connecting block (9) is welded on the outer wall of the stirring rotating shaft (5), connecting rods (10) are welded on the left side and the right side of the connecting block (9), stirring rods (12) are arranged at the end parts of the connecting rods (10), second stirring blades (13) which are symmetrically arranged are arranged on the outer wall of each stirring rod (12), third stirring blades (14) are uniformly distributed on the inner wall of the mixing barrel (2), the second stirring blades (13) and the third stirring blades (14) are vertically staggered, a discharge port (15) is arranged at the bottom of the mixing barrel (2), and a discharge valve is arranged on the discharge port (15), the bottom end of the right side of the machine body (1) is connected with a discharge pipe (151).
9. The preparation process of the waterproof and antibacterial packaging film according to claim 8, characterized in that: gear drive mechanism (6) establish outer gear (601) on stirring pivot (5) outer wall and fix on mixing barrel (2) and set up inner gear (602) in mixing barrel (2) side wall axle center department, outer gear (601) and inner gear (602) coaxial and coplanar set up, be equipped with drive gear (603) between outer gear (601) and inner gear (602), drive gear (603) are connected with outer gear (601) and inner gear (602) meshing respectively.
10. The preparation process of the waterproof and antibacterial packaging film according to claim 8, characterized in that: a rotating shaft cooling mechanism (8) is arranged between the driving motor (7) and the machine body (1), the rotating shaft cooling rotating shaft (8) is arranged on the outer wall of the stirring rotating shaft (5), the rotating shaft cooling mechanism (8) comprises a cover body (81), an air inlet (82) is formed in the left side of the cover body (81), a condenser (84) is arranged at the air inlet (82), a filter screen (83) is fixedly connected at the air inlet (82), an air outlet (89) is arranged at the corresponding position of the right side of the cover body (81) and the air inlet (82), a fan (88) is arranged at the air outlet (89), a shaft sleeve (85) is sleeved on the outer wall of the section of the stirring rotating shaft (5) positioned on the cover body (81), the left side of the shaft sleeve (85) is connected with an air guide shaft (86), the left end of the air guide shaft (86) is arranged right opposite to the air inlet (82), spiral air deflectors (87) are spirally distributed on the outer wall of the air guide shaft (86) along the axial direction.
CN201911331326.1A 2019-12-21 2019-12-21 Waterproof and antibacterial packaging film and preparation process thereof Withdrawn CN111138748A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112515861A (en) * 2021-01-04 2021-03-19 川田卫生用品(浙江)有限公司 Portable sanitary towel
CN112898661A (en) * 2021-01-21 2021-06-04 宇豪(马鞍山)科技有限公司 Antibacterial and antiviral composite material for automobile steering wheel
RU2752860C1 (en) * 2021-03-22 2021-08-11 Федеральное Государственное Бюджетное Учреждение Науки Институт Биохимической Физики Им. Н.М. Эмануэля Российской Академии Наук (Ибхф Ран) Biodegradable composite material with antibacterial effect
CN117511159A (en) * 2024-01-05 2024-02-06 湖南大道新材料有限公司 Cosmetic dry-wet separation packaging bag

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112515861A (en) * 2021-01-04 2021-03-19 川田卫生用品(浙江)有限公司 Portable sanitary towel
CN112898661A (en) * 2021-01-21 2021-06-04 宇豪(马鞍山)科技有限公司 Antibacterial and antiviral composite material for automobile steering wheel
RU2752860C1 (en) * 2021-03-22 2021-08-11 Федеральное Государственное Бюджетное Учреждение Науки Институт Биохимической Физики Им. Н.М. Эмануэля Российской Академии Наук (Ибхф Ран) Biodegradable composite material with antibacterial effect
CN117511159A (en) * 2024-01-05 2024-02-06 湖南大道新材料有限公司 Cosmetic dry-wet separation packaging bag
CN117511159B (en) * 2024-01-05 2024-03-22 湖南大道新材料有限公司 Cosmetic dry-wet separation packaging bag

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