CN112874096A - PVDC co-extrusion film for sealing inner gasket of bottle cap - Google Patents
PVDC co-extrusion film for sealing inner gasket of bottle cap Download PDFInfo
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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
- B32B27/06—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
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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
- B32B27/304—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
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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
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- 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
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- 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
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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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- 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
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- 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
- C08L2207/066—LDPE (radical process)
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Abstract
The utility model provides a sealed PVDC of bottle lid inner gasket is crowded membrane altogether, comprises skin, first bond line, barrier layer, second bond line, inferior inlayer and the inlayer that sets gradually, and to the part by mass, the barrier layer includes following component: 80-90 parts of vinylidene chloride monomer, 5-15 parts of methyl acrylate monomer, 3-7.5 parts of chitosan, 1-2 parts of plasticizer, 3-4 parts of heat stabilizer, 0.5 part of lubricant, 0.3 part of dispersant and 0.2 part of chelating agent. The sealing film prepared by adopting the formula of the barrier layer has excellent oxygen resistance and water resistance, the oxygen resistance of the sealing film is not influenced by the ambient environment humidity, and the external bad smell can be effectively prevented from entering the sealing film through the bottle cap; meanwhile, the water in the bottle can be prevented from losing in the storage process.
Description
Technical Field
The invention relates to the technical field of bottle cap packaging, in particular to a PVDC co-extrusion film for sealing a gasket in a bottle cap.
Background
In recent years, as importance of food/medicine safety is increased, market demand is increasing, and the gasket in the bottle cap plays a very large role in food/medicine packaging. The inner gasket of the bottle cap can better protect food/medicine from bacteria invasion in a plurality of processes such as transportation, goods shelves and the like, and the inner gasket can ensure that the bottle cap is sealed more tightly, thereby playing a good role in protecting the articles in the bottle.
The bottle cap gasket has wide application in food packaging, including health products, seasoning bottles, beer and the like. Market research in 2014 shows that the products in the bottle cap gasket market in China are hundreds of types, and the bottle cap gaskets of various types, specifications and types fill the food packaging container market and are mainly made of the following types: PVC material bottle lid gasket: soybean milk, beer, health product bottle caps, etc.; PE material bottle lid gasket: soybean milk, beer, health product bottle caps, etc.; other material bottle cap gasket: epoxy resin coating sauce bottle caps and the like. The invention aims to provide a bottle cap gasket sealing film which is light in weight and excellent in barrier property aiming at the prior art in the market.
Disclosure of Invention
The sealing film prepared by adopting the formula of the barrier layer has excellent oxygen resistance and water resistance, the oxygen resistance of the sealing film is not influenced by the ambient environment humidity, and the external bad smell can be effectively prevented from entering the sealing film through the bottle cap; meanwhile, the water in the bottle can be prevented from losing in the storage process.
The technical scheme adopted by the invention for realizing the purpose is as follows: the utility model provides a sealed PVDC of bottle lid inner gasket is crowded membrane altogether, comprises skin, first bond line, barrier layer, second bond line, inferior inlayer and the inlayer that sets gradually, and to the part by mass, the barrier layer includes following component: 80-90 parts of vinylidene chloride monomer, 5-15 parts of methyl acrylate monomer, 3-7.5 parts of chitosan, 1-2 parts of plasticizer, 3-4 parts of heat stabilizer, 0.5 part of lubricant, 0.3 part of dispersant and 0.2 part of chelating agent.
Preferably, the plasticizer is dioctyl sebacate, the heat stabilizer is epoxy resin, the lubricant is stearic acid amide, the chelating agent is EGTA, and the dispersing agent is hydroxypropyl methyl cellulose.
Wherein the thicknesses of the outer layer, the first adhesive layer, the barrier layer, the second adhesive layer, the secondary inner layer and the inner layer respectively account for 20%, 10%, 25% and 25% of the total thickness of the sealing film.
In the invention, the outer layer comprises the following raw materials in percentage by mass: 65-75% of linear low-density polyethylene, 25-35% of low-density polyethylene, 5-10% of antibacterial master batch, 20-30% of white master batch, 1.5-2.5% of opening slipping agent, 2-5% of filler and 0.5-1.5% of plasticizer. Wherein, the filler is prepared from modified bamboo fiber, nano montmorillonite and a dispersing agent according to the weight ratio of 1-2: 1-3: 0.1-0.2, wherein a proper amount of bamboo fiber is mixed with silane coupling agent accounting for 1-3 times of the weight of the bamboo fiber, and the mixture is stirred for 6-10h and then dried in vacuum to obtain the modified bamboo fiber.
In the invention, the secondary inner layer comprises the following raw materials in percentage by mass: 65-75% of linear low-density polyethylene, 15-25% of low-density polyethylene and 5-15% of metallocene polyethylene, wherein the mass of the white master batch accounts for 8-15% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene, and the mass of the plasticizer accounts for 0.5-1.5% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene.
In the invention, the inner layer comprises the following raw materials in percentage by mass: 65-75% of linear low-density polyethylene, 15-25% of low-density polyethylene and 5-15% of metallocene polyethylene, wherein the mass of the additive accounts for 3.5-8.0% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene, the mass of the opening smooth auxiliary agent accounts for 1.5-2.0% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene, the mass of the plasticizer accounts for 0.5-1.0% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene, and the mass of the white master batch accounts for 8-12% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene. Wherein the additive is titanium dioxide, vegetable oil and porous corn starch according to the weight ratio of 1-2: 1: 1, in a mass ratio of 1.
In the invention, dioctyl sebacate plasticizer and epoxy resin stabilizer are added, and stearic acid amide is adopted as lubricant, so that thermal decomposition in the processing of the barrier layer is effectively reduced, and the aging resistance is improved, so that the sealing film has excellent thermal stability and processing performance.
Particularly, the bottle body sealing problem in the prior art is that an aluminum foil product is generally adopted for sealing, so that the cost is high, the aluminum foil is fragile and easy to break in use, and the sealed liquid article is easy to leak; meanwhile, the acid resistance is poor, for example, the acid-resistant apple vinegar is easy to oxidize and has short shelf life when being filled with acid fruit juice such as apple vinegar. The sealing film prepared by the formula has low cost, is soft, has good water vapor isolation performance, can prevent peculiar smell from permeating, has good fresh-keeping and fragrance-keeping performance, is suitable for preserving food for a long time, and has excellent acid resistance, alkali resistance, chemical medicine resistance and oil and grease resistance.
The sealing film prepared by the formula has oxygen transmission capacity of less than or equal to 8 cm/square meter.24 h.0.1 MPa and water vapor transmission capacity of less than or equal to 3 g/cm/24 h, is a high-molecular copolymer, has better chemical resistance, tougher product, higher impact strength, good thermal shrinkage and chemical stability and can be subjected to low-temperature heat sealing compared with other inner gaskets in the prior art, and has the biggest characteristic of excellent comprehensive barrier property because of high crystallinity. Because the product does not contain hydrophilic groups, the product can well block the permeation of water vapor, and the barrier property to gas is not influenced by the ambient temperature and humidity.
Detailed Description
The invention is further illustrated below with reference to specific examples.
Example 1
The utility model provides a sealed PVDC of bottle lid inner gasket crowded membrane altogether, comprises skin, first bond line, barrier layer, second bond line, inferior inlayer and the inlayer that sets gradually, and the thickness of skin, first bond line, barrier layer, second bond line, inferior inlayer and inlayer accounts for 20%, 10%, 25% of seal membrane gross thickness respectively. The barrier layer comprises the following components in parts by mass: 87 parts of vinylidene chloride monomer, 13 parts of methyl acrylate monomer, 3 parts of chitosan, 2 parts of plasticizer, 4 parts of epoxy resin, 0.5 part of lubricant, 0.3 part of dispersant and 0.2 part of chelating agent.
Wherein, the raw materials of the first adhesive layer and the second adhesive layer are TIE, and the raw materials in the outer layer are as follows: 70% of linear low-density polyethylene, 30% of low-density polyethylene, 10% of antibacterial master batch, 22% of white master batch, 2.0% of opening slipping agent, 1.0% of plasticizer and 5% of filler, wherein the filler is prepared from modified bamboo fibers, nano montmorillonite and dispersing agent according to the weight ratio of 1: 3: 0.2, wherein a proper amount of bamboo fiber is mixed with silane coupling agent accounting for 1.5 times of the weight of the bamboo fiber, and the mixture is stirred for 8 hours and then dried in vacuum to obtain the modified bamboo fiber.
The barrier layer has excellent barrier performance, and the sealing film has excellent antibacterial performance due to the addition of the chitosan and the antibacterial master batch. Meanwhile, the sealing film has excellent thermal stability and tear resistance due to the synergistic effect of the components in the outer-layer filler, the layered structure of the montmorillonite is interwoven with the fibrous structure of the bamboo fiber, so that the bonding strength of the filler and the outer-layer matrix polyethylene is improved, the filler is well coated in the matrix polyethylene, and the tear resistance of the sealing film is improved.
The secondary inner layer comprises the following raw materials: 70% of linear low-density polyethylene, 20% of low-density polyethylene and 10% of metallocene polyethylene, wherein the mass of the white master batch accounts for 11% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene, and the mass of the plasticizer accounts for 1.0% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene.
The inner layer comprises the following raw materials: 70% of linear low-density polyethylene, 20% of low-density polyethylene, 10% of metallocene polyethylene, 2.0% of an opening smooth auxiliary agent by mass, 1.0% of a plasticizer by mass, 11% of a white master batch by mass, 7.0% of an additive by mass, and the balance of titanium dioxide, vegetable oil and porous corn starch as additives, wherein the mass of the opening smooth auxiliary agent accounts for the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene, the mass of the plasticizer accounts for the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene is 1: 1: 1, in a mass ratio of 1. The vegetable oil in the inner layer is adsorbed in the porous corn starch, so that the inner layer has excellent antioxidant effect, and the titanium dioxide is also adsorbed in the porous corn starch, so that the anti-aging performance and the antifouling and antibacterial capacity of the sealing film are greatly improved due to the good ultraviolet absorption capacity and mechanical property of the sealing film.
The barrier layer comprises a vinylidene chloride monomer and a methyl acrylate monomer, wherein the vinylidene chloride monomer has strong intermolecular cohesion and high crystallinity, chlorine atoms in the molecules have hydrophobicity and cannot form hydrogen bonds, and oxygen molecules and water molecules are difficult to move in the molecules of the vinylidene chloride monomer, so that the barrier layer has excellent oxygen resistance and water resistance, and the oxygen resistance is not influenced by the humidity of the surrounding environment.
The outer layer is composed of linear low-density polyethylene, white master batch, opening slipping agent and plasticizer, the linear low-density polyethylene is used as a main body, the processing formability is good, the thickness is 8-150 micrometers, the linear low-density polyethylene is used as a seal, the seal is firm and is not easy to pierce, the thickness of the seal film can be correspondingly reduced, and therefore the weight of the seal film is reduced.
The secondary inner layer is composed of linear low-density polyethylene, metallocene polyethylene, white master batch and a plasticizer, the inner layer is composed of linear low-density polyethylene, metallocene polyethylene, white master batch, an opening slipping agent and a plasticizer, the metallocene polyethylene is added, the pollution resistance, puncture resistance and heat sealing performance of the sealing film are improved, the metallocene polyethylene can save energy consumption, and more stable production operation, film production line yield and film quality are created, so that waste is reduced. The bag breaking rate is lower, the material loss is lower, and the shelf life of the packaging shelf is longer. Metallocene polyethylene film grades have lower melting points and distinct melt zones and are significantly superior to conventional polyethylenes in terms of toughness, clarity, hot tack, heat seal temperature, low odor, and the like.
Wherein the linear low density polyethylene has a melt flow rate of about 0.9g/10min and a density of about 0.92g/cm 3; the metallocene polyethylene has a melt flow rate of about 9.5g/10min and a density of about 0.89g/cm 3; the low density polyethylene had a melt flow rate of about 0.965g/10min and a density of about 0.93g/cm 3.
The preparation process of the embodiment comprises the following steps: 1. determining the production time according to the order requirement; heating a film blowing machine die set before starting up; setting the temperature of a first zone, a second zone, a third zone and a fourth zone of the first heating die set to be 150 ℃, setting the temperature of the die to be 184 ℃ for the second time when the temperature of the die reaches 150 ℃, and continuously heating to the set temperature; simultaneously setting the temperature of each extruder for the first time and starting heating; the temperature of the first zone of the No. 1, No. 3 and No. 5 extruders is set to be 130 ℃, and the temperature of the second zone, the third zone, the fourth zone and the fifth zone are set to be 140 ℃; the temperature of a first zone of the No. 2 extruder is set to be 100 ℃, and the temperature of a second zone, a third zone, a fourth zone and a fifth zone of the No. 2 extruder is set to be 110 ℃; the first temperature zone of No. 4 and No. 6 extruders is set to be 80 ℃, and the second zone, the third zone, the fourth zone and the fifth zone are all set to be 100 ℃; when the temperatures of all the extruders reach the set temperature, setting the temperature for the second time, and setting the temperature of each extruder, wherein the first zone of the No. 1 extruder is set to be 170 ℃, the second zone is set to be 180 ℃, the third zone is set to be 185 ℃ and the fourth zone is set to be 186 ℃; the first zone of the No. 2 extruder is set to be 130 ℃, the second zone and the third zone are 140 ℃, and the fourth zone and the fifth zone are 142 ℃; the first zone of the No. 3 extruder is set to be 172 ℃, the second zone is set to be 180 ℃, the third zone and the fourth zone are set to be 185 ℃, and the fifth zone is set to be 186 ℃; the first zone of the No. 5 extruder is set to be 174 ℃, the second zone is set to be 182 ℃, the third zone and the fourth zone are set to be 184 ℃, and the fifth zone is set to be 186 ℃; the first zone of the No. 4 and No. 6 extruders is set to be 135 ℃, and the second zone, the third zone, the fourth zone and the fifth zone are set to be 150 ℃; and when the temperature of the die and the temperature of the extruder reach the set temperature, starting the extruder after heat preservation is carried out for 0.5 h. The temperature of each extruder is adjusted in a small range according to the condition of the film surface after the extruder is started.
The white master batch is a food-grade film white master batch purchased in the market. The raw materials and auxiliary materials pass the safety certification of China QS food. The test data for example 1 is shown in table 1 below.
Table 1 example 1 test data
Example 2
The utility model provides a sealed PVDC of bottle lid inner gasket is crowded membrane altogether, comprises skin, first bond line, barrier layer, second bond line, inferior inlayer and the inlayer that sets gradually, and to the part by mass, the barrier layer includes following component: 85 parts of vinylidene chloride monomer, 15 parts of methyl acrylate monomer, 5.5 parts of chitosan, 1 part of plasticizer, 3 parts of epoxy resin, 0.5 part of lubricant, 0.3 part of dispersant and 0.2 part of chelating agent.
Wherein, the raw materials in the outer layer are as follows: 72% of linear low-density polyethylene, 28% of low-density polyethylene, 20% of white master batch, 6.5% of antibacterial master batch, 1.7% of opening slipping agent, 0.5% of plasticizer, 2% of filler, wherein the white master batch is composed of modified bamboo fibers, nano-montmorillonite and dispersing agent according to the mass ratio of 2: 1: 0.1, wherein a proper amount of bamboo fiber is mixed with silane coupling agent accounting for 2 times of the mass of the bamboo fiber, and then the mixture is stirred for 7 hours and dried in vacuum to obtain the modified bamboo fiber.
The secondary inner layer comprises the following raw materials: 75% of linear low-density polyethylene, 15% of low-density polyethylene and 10% of metallocene polyethylene, wherein the mass of the white master batch accounts for 10% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene, and the mass of the plasticizer accounts for 1.5% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene.
The inner layer comprises the following raw materials: 65% of linear low-density polyethylene, 22% of low-density polyethylene, 13% of metallocene polyethylene, 1.5% of an opening smooth auxiliary agent by mass, 0.8% of a plasticizer by mass, 12% of a white master batch by mass, 8.0% of an additive by mass, wherein the additive is titanium dioxide, vegetable oil and porous corn starch according to a weight ratio of 1.3: 1: 1, in a mass ratio of 1.
Table 2 example 2 test data
Example 3
The utility model provides a sealed PVDC of bottle lid inner gasket is crowded membrane altogether, comprises skin, first bond line, barrier layer, second bond line, inferior inlayer and the inlayer that sets gradually, and to the part by mass, the barrier layer includes following component: 90 parts of vinylidene chloride monomer, 10 parts of methyl acrylate monomer, 7.5 parts of chitosan, 1.5 parts of dioctyl sebacate, 3.5 parts of epoxy resin, 0.5 part of stearic acid amide, 0.3 part of dispersant and 0.2 part of chelating agent.
Wherein, the raw materials in the outer layer are as follows: 65% of linear low-density polyethylene, 35% of low-density polyethylene, 25% of white master batch, 2.2% of opening slipping agent, 5% of antibacterial master batch, 1.3% of plasticizer, 3.5% of filler, and the balance of modified bamboo fiber, nano-montmorillonite and dispersant according to the weight ratio of 1.5: 2: 0.2, wherein a proper amount of bamboo fiber is mixed with silane coupling agent accounting for 1 time of the mass of the bamboo fiber, and the mixture is stirred for 10 hours and then dried in vacuum to obtain the modified bamboo fiber.
The secondary inner layer comprises the following raw materials: 68% of linear low-density polyethylene, 24% of low-density polyethylene and 8% of metallocene polyethylene, wherein the mass of the white master batch accounts for 13% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene, and the mass of the plasticizer accounts for 0.5% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene.
The inner layer comprises the following raw materials: 74% of linear low-density polyethylene, 15% of low-density polyethylene, 11% of metallocene polyethylene, 1.7% of an opening smooth auxiliary agent by mass, 0.5% of a plasticizer by mass, 10% of a white master batch by mass, 5.0% of an additive by mass, and the additive is titanium dioxide, vegetable oil and porous corn starch according to a ratio of 2: 1: 1, in a mass ratio of 1.
The raw materials adopted by the invention are nontoxic and odorless, the metallocene polyethylene in the raw materials is obviously superior to the traditional polyethylene in the aspects of toughness, transparency, hot adhesiveness, heat sealing temperature and the like, and the added slipping agent increases the extensibility, so that the metallocene polyethylene is easy to pull and is not easy to break.
Table 3 example 3 test data
The preparation process of the product of the invention comprises the following steps: 1. determining the production time according to the order requirement; heating a film blowing machine die set before starting up; setting the temperature of a first zone, a second zone, a third zone and a fourth zone of the first heating die set to be 150 ℃, setting the temperature of the die to be 184 ℃ for the second time when the temperature of the die reaches 150 ℃, and continuously heating to the set temperature; simultaneously setting the temperature of each extruder for the first time and starting heating; the temperature of the first zone of the No. 1, No. 3 and No. 5 extruders is set to be 130 ℃, and the temperature of the second zone, the third zone, the fourth zone and the fifth zone are set to be 140 ℃; the temperature of a first zone of the No. 2 extruder is set to be 100 ℃, and the temperature of a second zone, a third zone, a fourth zone and a fifth zone of the No. 2 extruder is set to be 110 ℃; the first temperature zone of No. 4 and No. 6 extruders is set to be 80 ℃, and the second zone, the third zone, the fourth zone and the fifth zone are all set to be 100 ℃; when the temperatures of all the extruders reach the set temperature, setting the temperature for the second time, and setting the temperature of each extruder, wherein the first zone of the No. 1 extruder is set to be 170 ℃, the second zone is set to be 180 ℃, the third zone is set to be 185 ℃ and the fourth zone is set to be 186 ℃; the first zone of the No. 2 extruder is set to be 130 ℃, the second zone and the third zone are 140 ℃, and the fourth zone and the fifth zone are 142 ℃; the first zone of the No. 3 extruder is set to be 172 ℃, the second zone is set to be 180 ℃, the third zone and the fourth zone are set to be 185 ℃, and the fifth zone is set to be 186 ℃; the first zone of the No. 5 extruder is set to be 174 ℃, the second zone is set to be 182 ℃, the third zone and the fourth zone are set to be 184 ℃, and the fifth zone is set to be 186 ℃; the first zone of the No. 4 and No. 6 extruders is set as 140 ℃ and the second zone, the third zone, the fourth zone and the fifth zone are set as 160 ℃ at 130-; and when the temperature of the die and the temperature of the extruder reach the set temperature, starting the extruder after heat preservation is carried out for 0.5 hour. The temperature of each extruder is adjusted in a small range according to the condition of the film surface after the extruder is started.
2. Weighing the used raw materials according to a formula ratio, and sequentially feeding the raw materials into a mixer for mixing, wherein the mixing time is 15min after all the raw materials enter the mixer, so that all the raw materials are uniformly mixed; the raw materials used by the extruders are different and are sequentially and respectively proportioned, wherein the raw materials used by the No. 2, No. 4 and No. 6 extruders do not need to be proportioned.
3. The raw materials which are uniformly mixed and stirred are circulated to a film blowing machine by a stainless steel circulating basket; when blown film unit mould temperature and extruder temperature reach the settlement degree, with each required raw materials of extruder of group in passing through the auto sucking machine suction hopper, then adjust each extruder rotational speed respectively in well accuse, No. 1, No. 3, No. 5 adjustment rotational speeds are 30Hz, No. 2 position 20 Hz, No. 4 and No. 6 are 15 Hz, after the raw materials in the extruder reached the die orifice through the mould, operating personnel drew out the membrane from the die orifice play, upwards in proper order through steady bubble ware, the deck, draw I, go up the rotation, then pass through each roller bearing downwards in proper order, the corona machine, rectify a deviation, draw II, reach the rolling shaft at last, adjust each extruder rotational speed this moment and do not: numbers 1, 3 and 5 were 50 Hz, numbers 2 were 30Hz, and numbers 4 and 6 were 25 Hz; setting the speed of traction I to be 10 Hz, the speed of traction II to be 30Hz, external air to be 36, air to be 13, air to be 25 and winding to be 11 m/min; when the film surface of the co-extrusion film meets the quality requirement, an operator measures the thickness, the width and the corona and adjusts the thickness, the width and the corona to the order requirement; in the production process, an operator performs self-inspection on the specification, the model, the appearance quality and the like of the product according to the product quality requirement; obviously marking the defective products, and remarking on the production record;
4. after the products are produced, packaging is carried out, the products are transferred to a semi-finished product storage area and placed on a tray for later use; and is covered by a black film to prevent light from directly irradiating the product;
5. during cutting, black spots, crystal spots and impurities generated in the production process are removed by operators; packaging the cut products in an inner package according to the packaging requirements, boxing and labeling;
6. the product is cut and is packed the in-process detection room and sample immediately according to this batch of product quantity and detect, and the detection project is: sensory, specification and size, mechanical index, optical property, barrier property and other indexes; and (5) placing the boxed products on the tray according to the requirement, and transferring the boxed products to a finished product warehouse in time.
In the processing process, the position of the throttling ring at the outlet of each layer of runner is adjusted to adjust the gap of the outlet of each layer of runner so as to control the melt flow of each runner, thereby achieving the purpose of controlling the thickness of the film. When the film is blown, the blow ratio of the finished film is 2-3. The traction of the PVDC co-extruded film is actually to longitudinally stretch the PVDC co-extruded film, so that the PVDC co-extruded film has an orientation effect in the longitudinal direction, the longitudinal strength is increased, and the thickness of the film is reduced. The traction can be expressed by a traction ratio, namely the ratio of the traction speed to the extrusion speed of the pipe ring, if the traction speed is too high, the film breaking phenomenon is likely to occur, and the traction ratio of the PVDC co-extruded film in the traction process is 3-5.
In the present invention, the adhesive layer is TIE adhesive resin or EVA resin. Preferably, the adhesive layer is an EVA resin, and the EVA resin is composed of 40-50 wt% of resin A and 50-60 wt% of resin B, wherein the VA content of the resin A is 25 wt% and the VA content of the resin B is 18 wt%. The adhesive layer is composed of two EVA with different viscosities, so that the film is high in integral high-temperature resistance and resistant to high temperature of more than 95 ℃, meanwhile, the film is smoother, delamination between layers is avoided, the color is not whitish, and the packaging appearance is effectively improved.
The sealing film prepared by the invention is detected according to GB/T28117-2011 by randomly sampling a 45-box, the plasticizer content is not detected (the limit of quantitation is 5.0, GB/T31604.30-2016), and the detection results are shown in the following table 4.
Table 4 PVDC film test data of the invention
Claims (8)
1. The utility model provides a sealed PVDC of bottle lid inner gasket is crowded membrane altogether which characterized in that: the anti-blocking coating comprises an outer layer, a first bonding layer, a blocking layer, a second bonding layer, a secondary inner layer and an inner layer which are sequentially arranged, wherein the blocking layer comprises the following components in parts by mass: 80-90 parts of vinylidene chloride monomer, 5-15 parts of methyl acrylate monomer, 3-7.5 parts of chitosan, 1-2 parts of plasticizer, 3-4 parts of heat stabilizer, 0.5 part of lubricant, 0.3 part of dispersant and 0.2 part of chelating agent.
2. The bottle cap inner gasket seal PVDC coextruded film of claim 1, wherein: the plasticizer is dioctyl sebacate, the heat stabilizer is epoxy resin, the lubricant is stearic acid amide, the chelating agent is EGTA, and the dispersant is hydroxypropyl methyl cellulose.
3. The bottle cap inner gasket seal PVDC coextruded film of claim 1, wherein: the thicknesses of the outer layer, the first adhesive layer, the barrier layer, the second adhesive layer, the secondary inner layer and the inner layer account for 20%, 10%, 25% and 25% of the total thickness of the sealant film, respectively.
4. The bottle cap inner gasket seal PVDC coextruded film of claim 1, wherein: the outer layer comprises the following raw materials in percentage by mass: 65-75% of linear low-density polyethylene, 25-35% of low-density polyethylene, 5-10% of antibacterial master batch, 20-30% of white master batch, 1.5-2.5% of opening slipping agent, 2-5% of filler and 0.5-1.5% of plasticizer.
5. The bottle cap inner gasket seal PVDC co-extruded film of claim 4, wherein: the filler is prepared from modified bamboo fibers, nano montmorillonite and a dispersing agent according to the weight ratio of 1-2: 1-3: 0.1-0.2, wherein a proper amount of bamboo fiber is mixed with silane coupling agent accounting for 1-3 times of the weight of the bamboo fiber, and the mixture is stirred for 6-10h and then dried in vacuum to obtain the modified bamboo fiber.
6. The bottle cap inner gasket seal PVDC coextruded film of claim 1, wherein: the secondary inner layer comprises the following raw materials in percentage by mass: 65-75% of linear low-density polyethylene, 15-25% of low-density polyethylene and 5-15% of metallocene polyethylene, wherein the mass of the white master batch accounts for 8-15% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene, and the mass of the plasticizer accounts for 0.5-1.5% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene.
7. The bottle cap inner gasket seal PVDC coextruded film of claim 1, wherein: the inner layer comprises the following raw materials in percentage by mass: 65-75% of linear low-density polyethylene, 15-25% of low-density polyethylene and 5-15% of metallocene polyethylene, wherein the mass of the additive accounts for 3.5-8.0% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene, the mass of the opening smooth auxiliary agent accounts for 1.5-2.0% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene, the mass of the plasticizer accounts for 0.5-1.0% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene, and the mass of the white master batch accounts for 8-12% of the total mass of the linear low-density polyethylene, the low-density polyethylene and the metallocene polyethylene.
8. The bottle cap inner gasket seal PVDC coextruded film of claim 7, wherein: the additive is prepared from titanium dioxide, vegetable oil and porous corn starch according to the weight ratio of 1-2: 1: 1, in a mass ratio of 1.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101560276A (en) * | 2009-05-21 | 2009-10-21 | 浙江巨化股份有限公司电化厂 | VDC/MA copolymerized PVDC composition |
| CN102321410A (en) * | 2011-07-27 | 2012-01-18 | 甘肃圣邦新材料有限公司 | Composite modified starch environmentally-friendly interior wall coating and preparation method thereof |
| CN105538857A (en) * | 2016-01-18 | 2016-05-04 | 广东星格新材料有限公司 | Antibacterial film, preparation method thereof and antibacterial packaging bag |
| CN106273954A (en) * | 2015-05-18 | 2017-01-04 | 上海圳拓实业有限公司 | A kind of antibiosis layered board and preparation method thereof |
| CN106366408A (en) * | 2016-08-30 | 2017-02-01 | 滁州市朝昱农业科技有限公司 | Degradable insect prevention and removal agricultural thin film |
| CN106475082A (en) * | 2016-08-31 | 2017-03-08 | 姚望新 | A kind of activated carbon based titanium dioxide catalysis material |
| CN106973951A (en) * | 2017-03-24 | 2017-07-25 | 李军 | A kind of catalytically bactericidal process agent for loading clove oil and its preparation technology |
| CN107236318A (en) * | 2017-06-28 | 2017-10-10 | 太仓清宇特种塑料有限公司 | A kind of degradable bamboo is nanocomposite moulded |
| CN109093974A (en) * | 2018-08-02 | 2018-12-28 | 洛阳兴瑞新材料科技有限公司 | A kind of mold and film-forming method of the stretchable co-extrusion film of extrudable PVDC high-barrier |
| CN110016179A (en) * | 2019-04-30 | 2019-07-16 | 长沙而道新能源科技有限公司 | A kind of degredation plastic bag and preparation method thereof |
-
2021
- 2021-02-03 CN CN202110147033.9A patent/CN112874096A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101560276A (en) * | 2009-05-21 | 2009-10-21 | 浙江巨化股份有限公司电化厂 | VDC/MA copolymerized PVDC composition |
| CN102321410A (en) * | 2011-07-27 | 2012-01-18 | 甘肃圣邦新材料有限公司 | Composite modified starch environmentally-friendly interior wall coating and preparation method thereof |
| CN106273954A (en) * | 2015-05-18 | 2017-01-04 | 上海圳拓实业有限公司 | A kind of antibiosis layered board and preparation method thereof |
| CN105538857A (en) * | 2016-01-18 | 2016-05-04 | 广东星格新材料有限公司 | Antibacterial film, preparation method thereof and antibacterial packaging bag |
| CN106366408A (en) * | 2016-08-30 | 2017-02-01 | 滁州市朝昱农业科技有限公司 | Degradable insect prevention and removal agricultural thin film |
| CN106475082A (en) * | 2016-08-31 | 2017-03-08 | 姚望新 | A kind of activated carbon based titanium dioxide catalysis material |
| CN106973951A (en) * | 2017-03-24 | 2017-07-25 | 李军 | A kind of catalytically bactericidal process agent for loading clove oil and its preparation technology |
| CN107236318A (en) * | 2017-06-28 | 2017-10-10 | 太仓清宇特种塑料有限公司 | A kind of degradable bamboo is nanocomposite moulded |
| CN109093974A (en) * | 2018-08-02 | 2018-12-28 | 洛阳兴瑞新材料科技有限公司 | A kind of mold and film-forming method of the stretchable co-extrusion film of extrudable PVDC high-barrier |
| CN110016179A (en) * | 2019-04-30 | 2019-07-16 | 长沙而道新能源科技有限公司 | A kind of degredation plastic bag and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 刘美均: "竹纤维增强P34HB复合材料及P34HB热稳定性的研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》, no. 01, 15 January 2015 (2015-01-15), pages 23 - 25 * |
| 科尔斯等: "《保健食品工艺学》", 中国医药科技出版社, pages: 216 * |
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