CN111717524B - Medical sterilization bag resistant to high temperature and high pressure and preparation method thereof - Google Patents

Medical sterilization bag resistant to high temperature and high pressure and preparation method thereof Download PDF

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Publication number
CN111717524B
CN111717524B CN201910338570.4A CN201910338570A CN111717524B CN 111717524 B CN111717524 B CN 111717524B CN 201910338570 A CN201910338570 A CN 201910338570A CN 111717524 B CN111717524 B CN 111717524B
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protective layer
mixture
temperature
extruder
plastic film
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CN111717524A (en
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旷奇章
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Guangzhou Jinzhang Plastic Products Co ltd
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Guangzhou Jinzhang Plastic Products Co ltd
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    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls
    • 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
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/16—Cutting webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • 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
    • C08L23/06—Polyethene
    • 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
    • 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
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/02—Applications for biomedical use
    • 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
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Abstract

A high-temperature and high-pressure resistant medical sterilization bag is used for sterilizing medical instruments and medical wastes and using a high-pressure bin, and comprises a bag body, wherein the bag body comprises a composite plastic film, and the composite plastic film comprises an inner protective layer, an outer protective layer and a filling layer positioned between the inner protective layer and the outer protective layer; the inner protective layer and the outer protective layer are respectively composed of 45-55% of High Density Polyethylene (HDPE), 20-30% of Linear Low Density Polyethylene (LLDPE) and 20-30% of calcium carbonate (CaCO) by 100% by mass 3 ) The filling layer comprises, by mass, 100% of polypropylene (PP) 20-30% and LLDPE 70-80%. The high-temperature and high-pressure resistant medical sterilization bag is prepared through the steps of proportioning, extruding, film blowing, rolling, bag making and the like, has good high-temperature and high-pressure resistance, simple preparation process, low cost and wide application range.

Description

Medical sterilization bag resistant to high temperature and high pressure and preparation method thereof
Technical Field
The invention relates to the technical field of medical plastic bags, in particular to a high-temperature and high-pressure resistant medical sterilization bag and a preparation method thereof.
Background
The medical industry always generates a plurality of medical wastes, and the untreated or incompletely treated medical wastes are randomly piled, so that the pollution to water, soil and air is easily caused, the direct or indirect harm to human bodies is generated, and the medical wastes are possibly a source of epidemic diseases. At present, the treatment methods of medical waste include a sterilization method, a high-temperature incineration method, a pyrolysis treatment method, a plasma method and the like, a large number of sterilization bags which are simple to use, low in cost and resistant to high temperature and high pressure are often needed when the medical waste is treated, and the medical equipment is also required to be sterilized before or after being used, and a large number of sterilization bags which are resistant to high temperature and high pressure are also needed in the treatment process, so that a sterilization bag which is simple to use, low in cost and resistant to high temperature and high pressure is needed in the market
Disclosure of Invention
In view of the above, the invention provides a high-temperature and high-pressure resistant medical sterilization bag and a preparation method thereof, and provides a new choice for the medical sterilization bag.
The medical sterilization bag comprises a bag body, wherein the bag body comprises a composite plastic film, and the composite plastic film comprises an inner protective layer, an outer protective layer and a filling layer positioned between the inner protective layer and the outer protective layer; the inner protective layer and the outer protective layer are respectively composed of 45-55% of High Density Polyethylene (HDPE), 20-30% of Linear Low Density Polyethylene (LLDPE) and 20-30% of calcium carbonate (CaCO) by 100% by mass 3 ) The filling layer comprises, by mass, 100% of polypropylene (PP) 20-30% and LLDPE 70-80%.
Further preferably, the inner protective layer and the outer protective layer are each composed of 48 to 52% by mass of High Density Polyethylene (HDPE), 23 to 27% by mass of Linear Low Density Polyethylene (LLDPE) and 23 to 27% by mass of calcium carbonate (CaCO) based on 100% by mass 3 ) The filling layer comprises, by mass, 100% of a filling layer component, 23% -28% of polypropylene (PP) and 72% -77% of LLDPE.
Further preferably, the thickness of the inner protective layer and the outer protective layer is 0.1-0.5mm, and the thickness of the filling layer is 0.08-0.4 mm.
Further preferably, the inner protective layer is of a uniform thickness as the outer protective layer.
Further preferably, the thickness ratio of the inner protective layer or the outer protective layer to the filling layer is 5:4.
the invention also provides a preparation method of the high-temperature and high-pressure resistant medical sterilization bag, which is used for preparing the high-temperature and high-pressure resistant medical sterilization bag and comprises the following steps: step 1, batching: will be according to the composition of the inner protective layer and the outer protective layerA quantity of said HDPE, said LLDPE and said CaCO arranged in proportions 3 Putting the mixture into a stirrer to stir uniformly to obtain a mixture A; placing a certain amount of PP and LLDPE which are configured according to the component proportion of the filling layer into a stirrer to be uniformly stirred, so as to obtain a mixture B; step 2, extrusion: placing the mixture A into a first extruder, controlling the temperature in the first extruder to be 180-200 ℃, placing the mixture B into a second extruder, controlling the temperature in the second extruder to be 155-170 ℃, melting the mixture A and the mixture B, and enabling the melted mixture A and the melted mixture B to enter a connecting body connecting the first extruder and the second extruder, wherein the mixture A and the mixture B form a three-layer structure of the mixture A, the mixture B and the mixture A from inside to outside in sequence in the connecting body; step 3, film blowing: blowing out the three-layer structure through a die head to form a cylindrical composite plastic film bubble with an unsealed bottom, and cooling and shaping the composite plastic film bubble through cooling air to obtain the composite plastic film; and 4, winding: winding the composite plastic film obtained in the step 3; and 5, bag making: and sealing and cutting off the wound composite plastic film by a bag making machine to obtain the high-temperature and high-pressure resistant medical sterilizing bag.
Further preferably, the temperature of the connector is 190 ℃ to 195 ℃ and the temperature of the die head is 180 ℃ to 185 ℃.
Further preferably, the flow ratio of the mixture a in the first extruder to the mixture B in the second extruder into the connecting body is 10:8.
the invention has the beneficial effects that: the invention uses high-density polyethylene and linear low-density polyethylene to compound light calcium carbonate, wherein the addition of the light calcium carbonate enables the linear low-density polyethylene to crystallize at a higher temperature, improves the thermal stability of a mixed system, enables the obtained inner protective layer and outer protective layer to have excellent heat resistance and high pressure resistance, and simultaneously enables the obtained double protective layer structure formed by the inner protective layer and the outer protective layer to have good high temperature and high pressure resistance.
Drawings
FIG. 1 is a schematic view of the structure of the composite plastic film.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and the examples.
Referring to fig. 1, the present invention provides a medical sterilization bag resistant to high temperature and high pressure, which is used for sterilizing medical instruments and medical wastes and using a high-pressure bin, the medical sterilization bag resistant to high temperature and high pressure comprises a bag body, the bag body comprises a composite plastic film, the composite plastic film comprises an inner protection layer 1, an outer protection layer 2 and a filling layer 3 positioned between the inner protection layer 1 and the outer protection layer 2; the inner protective layer and the outer protective layer are respectively composed of 45-55% of High Density Polyethylene (HDPE), 20-30% of Linear Low Density Polyethylene (LLDPE) and 20-30% of calcium carbonate (CaCO) by 100% by mass 3 ) The filling layer comprises, by mass, 100% of polypropylene (PP) 20-30% and LLDPE 70-80%.
The thickness of the inner protective layer and the thickness of the outer protective layer are 0.1-0.5mm, the thickness of the filling layer is 0.08-0.4 mm, the thickness of the inner protective layer is consistent with the thickness of the outer protective layer, and the thickness ratio of the inner protective layer or the outer protective layer to the filling layer is 5:4. the invention also provides a preparation method of the high-temperature and high-pressure resistant medical sterilization bag, which is used for preparing the high-temperature and high-pressure resistant medical sterilization bag and mainly comprises the following steps:
step 1, batching: a quantity of the HDPE, LLDE and CaCO to be arranged in proportion to the components of the inner protective layer and the outer protective layer 3 Putting the mixture into a stirrer to stir uniformly to obtain a mixture A; placing a certain amount of PP and LLDPE which are configured according to the component proportion of the filling layer into a stirrer to be uniformly stirred, so as to obtain a mixture B;
step 2, extrusion: placing the mixture A into a first extruder, controlling the temperature in the first extruder to be 180-200 ℃, placing the mixture B into a second extruder, controlling the temperature in the second extruder to be 155-170 ℃, enabling the mixture A and the mixture B to be melted, enabling the melted mixture A and the melted mixture B to enter a connecting body connecting the first extruder and the second extruder, and controlling the flow ratio of the mixture A in the first extruder to the mixture B in the second extruder to enter the connecting body to be 10:8, the temperature of the connector is 190-195 ℃, and the mixture A and the mixture B form a three-layer structure of the mixture A, the mixture B and the mixture A in the connector from inside to outside in sequence;
step 3, film blowing: blowing out the three-layer structure through a die head to form a cylindrical composite plastic film bubble with an unsealed bottom, controlling the temperature of the die head to be 180-185 ℃, and cooling and shaping the composite plastic film bubble through cooling air to obtain the composite plastic film;
and 4, winding: winding the composite plastic film obtained in the step 3;
and 5, bag making: and sealing and cutting off the wound composite plastic film by a bag making machine to obtain the high-temperature and high-pressure resistant medical sterilizing bag.
Example 1
The embodiment provides a high-temperature and high-pressure resistant medical sterilization bag, which comprises a bag body, wherein the bag body comprises a composite plastic film, and the composite plastic film comprises an inner protective layer 1, an outer protective layer 2 and a filling layer 3 positioned between the inner protective layer 1 and the outer protective layer 2; the inner protective layer and the outer protective layer comprise 45% of HDPE, 30% of LLDPE and 25% of CaCO by mass calculated by 100% by mass 3 The filler layer component comprises 20% by mass of the PP and 80% by mass of the LLDPE, calculated as 100% by mass.
Example 2
The present embodiment is different from embodiment 1 in that this embodiment provides a high temperature and high pressure resistant medical sterilization bag; the inner protective layer and the outer protective layer comprise 55% of HDPE and 25% of HDPE by mass calculated by 100% of the mass partsParts of the LLDPE and 20% by mass of the CaCO 3 The filler layer component comprises 30% by mass of the PP and 70% by mass of the LLDPE, calculated as 100% by mass.
Example 3
The present embodiment is different from embodiment 1 in that this embodiment provides a high temperature and high pressure resistant medical sterilization bag; the inner protective layer and the outer protective layer comprise 50% of HDPE, 25% of LLDPE and 25% of CaCO by mass calculated by 100% by mass 3 The filler layer component comprises 25% by mass of the PP and 75% by mass of the LLDPE, calculated as 100% by mass.
Example 4
The present embodiment is different from embodiment 1 in that this embodiment provides a high temperature and high pressure resistant medical sterilization bag; the inner protective layer and the outer protective layer comprise 48% of HDPE, 25% of LLDPE and 27% of CaCO by mass calculated by 100% by mass 3 The filler layer component comprises 23% by mass of the PP and 77% by mass of the LLDPE, calculated as 100% by mass.
Example 5
The present embodiment is different from embodiment 1 in that this embodiment provides a high temperature and high pressure resistant medical sterilization bag; the inner protective layer and the outer protective layer comprise 52% of HDPE, 23% of LLDPE and 25% of CaCO by mass calculated by 100% by mass 3 The filler layer component comprises 28% by mass of the PP and 73% by mass of the LLDPE, calculated as 100% by mass.
Example 6
The present embodiment is different from embodiment 1 in that this embodiment provides a high temperature and high pressure resistant medical sterilization bag; the inner protective layer and the outer protective layer comprise 50% of HDPE, 27% of LLDPE and 23% of CaCO by mass calculated by 100% by mass 3 The filler layer component comprises 23% by mass of the PP and 77% by mass of the L, calculated as 100% by massLDPE。
Example 7
The embodiment provides a preparation method for preparing the high-temperature and high-pressure resistant medical sterilization bag provided by any one of the embodiments, which comprises the following steps:
step 1, batching: the HDPE, LLDE and CaCO are mixed according to the composition ratio of the inner protective layer and the outer protective layer in any of the above embodiments 3 Stirring in a stirrer at 25 ℃ to obtain a mixture A; placing the PP and the LLDPE which are configured according to the component proportion of the filling layer in any embodiment into a stirrer for stirring at 25 ℃ to obtain a mixture B;
step 2, extrusion: placing the mixture A into a first extruder, controlling the temperature in the first extruder to be 185-195 ℃, placing the mixture B into a second extruder, controlling the temperature in the second extruder to be 160-165 ℃, enabling the mixture A and the mixture B to be melted, enabling the melted mixture A and the melted mixture B to enter a connecting body connecting the first extruder and the second extruder, and controlling the flow ratio of the mixture A in the first extruder to the mixture B in the second extruder to enter the connecting body to be 10:8, the temperature of the connector is 190-195 ℃, and the mixture A and the mixture B form a three-layer structure of the mixture A, the mixture B and the mixture A in the connector from inside to outside in sequence;
step 3, film blowing: blowing out the three-layer structure through a die head of a film blowing machine to form a cylindrical composite plastic film bubble with an unsealed bottom, controlling the temperature of the die head to be 180-185 ℃, and cooling and shaping the composite plastic film bubble through cooling air to obtain the composite plastic film;
and 4, winding: winding the composite plastic film obtained in the step 3;
and 5, bag making: and sealing and cutting off the wound composite plastic film by a bag making machine to obtain the high-temperature and high-pressure resistant medical sterilizing bag.
In the process of preparing the high-temperature and high-pressure resistant medical sterilization bag, the inflation ratio and the traction ratio of a film blowing machine are required to be strictly controlled, so that the surface of the obtained high-temperature and high-pressure resistant medical sterilization bag is smooth and flat, and the quality of the high-temperature and high-pressure resistant medical sterilization bag is ensured.
The high-temperature and high-pressure resistant medical sterilization bag prepared by the embodiment 7 has good high-temperature and high-pressure resistant performance, is simple in preparation process and low in cost, can be used as a sterilization bag for sterilization before and after use of medical equipment, can be used as a garbage bag, often generates a plurality of medical wastes in the medical industry, and generates a plurality of harmful substances to the environment and human beings in the biochemical industry, the medical wastes and the harmful substances are usually required to be subjected to sterilization and disinfection treatment, the medical sterilization bag can be used as a garbage bag in the industries, and the medical wastes or the harmful substances in the high-temperature resistant sterilization bag can be treated together with the high-temperature and high-pressure resistant sterilization bag when being subjected to sterilization and disinfection, and the high-temperature resistant sterilization bag is not damaged after treatment, so that the medical wastes or the harmful substances are prevented from being scattered due to the damage of the bag, and the medical wastes or the harmful substances are convenient and good in use effect.
The foregoing description is only of a specific embodiment of the invention, but it will be understood by those skilled in the art that the present invention is illustrative only and the scope of the invention is defined by the appended claims. Equivalent variations to the claims of the present invention are therefore intended to be covered by the present invention.

Claims (6)

1. The high-temperature and high-pressure resistant medical sterilization bag is used for sterilizing medical instruments and medical wastes and is characterized by comprising a bag body, wherein the bag body comprises a composite plastic film, and the composite plastic film comprises an inner protective layer, an outer protective layer and a filling layer positioned between the inner protective layer and the outer protective layer; the thickness ratio of the inner protective layer to the outer protective layer is 5:4, a step of; the inner protective layer and the outer protective layer comprise 45-55% of High Density Polyethylene (HDPE) and 20% of the components in parts by mass of 100%About 30% of Linear Low Density Polyethylene (LLDPE) and 20% -30% of calcium carbonate (CaCO) 3 ) The filling layer comprises, by mass, 100% of polypropylene (PP) 20-30% and LLDPE 70-80%.
2. The high temperature and high pressure resistant medical sterilization bag according to claim 1, wherein the inner protective layer and the outer protective layer each comprise 48 to 52% of High Density Polyethylene (HDPE), 23 to 27% of Linear Low Density Polyethylene (LLDPE) and 23 to 27% of calcium carbonate (CaCO) in terms of 100% by mass 3 ) The filling layer comprises, by mass, 100% of polypropylene (PP) 23% -28% and LLDPE 72% -77%.
3. The high temperature and high pressure resistant medical sterilization bag according to claim 1, wherein the thickness of the inner protective layer and the outer protective layer is 0.1-0.5mm, and the thickness of the filling layer is 0.08-0.4 mm.
4. A method for preparing a medical sterilization bag resistant to high temperature and high pressure, which is used for preparing the medical sterilization bag resistant to high temperature and high pressure as claimed in claim 1, and is characterized by comprising the following steps:
step 1, batching: an amount of said HDPE, said LLDPE and said CaCO arranged in the proportions of the components of said inner protective layer and said outer protective layer as defined in claim 1 3 Putting the mixture into a stirrer to stir uniformly to obtain a mixture A; placing a certain amount of PP and LLDPE which are configured according to the component proportion of the filling layer in claim 1 into a stirrer to be uniformly stirred, so as to obtain a mixture B;
step 2, extrusion: placing the mixture A into a first extruder, controlling the temperature in the first extruder to be 180-200 ℃, placing the mixture B into a second extruder, controlling the temperature in the second extruder to be 155-170 ℃, melting the mixture A and the mixture B, and enabling the melted mixture A and the melted mixture B to enter a connecting body connecting the first extruder and the second extruder, wherein the mixture A and the mixture B form a three-layer structure of the mixture A, the mixture B and the mixture A from inside to outside in sequence in the connecting body;
step 3, film blowing: blowing out the three-layer structure through a die head to form a cylindrical composite plastic film bubble with an unsealed bottom, and cooling and shaping the composite plastic film bubble through cooling air to obtain the composite plastic film;
and 4, winding: winding the composite plastic film obtained in the step 3;
and 5, bag making: and sealing and cutting off the wound composite plastic film by a bag making machine to obtain the high-temperature and high-pressure resistant medical sterilizing bag.
5. The method for preparing a high temperature and high pressure resistant medical sterilization bag according to claim 4, wherein the temperature of the connector is 190 ℃ to 195 ℃ and the temperature of the die head is 180 ℃ to 185 ℃.
6. The method for preparing a high temperature and high pressure resistant medical sterilization bag according to claim 4, wherein a flow ratio of the mixture a in the first extruder to the mixture B in the second extruder to the connector is 10:8.
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