CN111186195A - Full PE bearing self-supporting bag and PE bearing base film thereof - Google Patents
Full PE bearing self-supporting bag and PE bearing base film thereof Download PDFInfo
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- CN111186195A CN111186195A CN202010066730.7A CN202010066730A CN111186195A CN 111186195 A CN111186195 A CN 111186195A CN 202010066730 A CN202010066730 A CN 202010066730A CN 111186195 A CN111186195 A CN 111186195A
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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
- 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
- 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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- 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
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
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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
- 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
- C08J2323/06—Polyethene
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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
- 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
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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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—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
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- 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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—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
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
Abstract
The invention discloses an all-PE load-bearing self-supporting bag and a PE load-bearing base film thereof, wherein the PE load-bearing base film comprises a first surface layer, a middle layer and a second surface layer which are sequentially overlapped, the first surface layer comprises 43-59% of LLDPE, 40-50% of HDPE, 0.5-5% of crosslinked UHMWPE, 0.3-1.5% of flow promoter, 0.2-0.5% of nucleating agent, the middle layer comprises 48-64% of LLDPE, 35-45% of HDPE, 0.5-5% of crosslinked HDPE, 0.3-1.5% of flow promoter, 0.2-0.5% of nucleating agent, and the second surface layer comprises 20-40% of LLDPE, 29.8-39.5% of HDPE, 30-40% of LDPE and 0.2-0.5% of nucleating agent. The PE load-bearing base film has good processability; the prepared self-supporting bag is high in strength, good in heat sealing, long in service life and environment-friendly.
Description
Technical Field
The invention relates to the field of packaging, in particular to an all-PE (polyethylene) load-bearing self-supporting bag and a PE load-bearing base film thereof.
Background
The good package can establish the high-quality image of the product and improve the competitiveness of the product, thereby promoting the sale of the product. There are a wide variety of product packaging categories, with stand-up pouches being considered one of the classic of modern packaging. It can adapt to automated production and fast-speed packing operation, can realize perfect printing quality through the plane printing, and the quality is light, can reduce the sale and store the cost, and the abandonment bag is handled easily, promotes product grade, strengthens goods shelves visual effect, carries lightly, convenient to use, dampproofing and waterproofing anti-oxidation and can the leakproofness etc. all possess certain advantage in a great deal of aspects. A free-standing pouch packaged product is very convenient for the consumer. In addition, the self-standing bag with the zipper/the stick bone can be reused, and the suction nozzle self-standing bag enables food to be poured out more conveniently.
The self-supporting bag generally consists of a bearing base layer and a heat sealing layer, and functional layers such as an oxygen-isolating protective layer and the like can be added according to the requirements of different packaged products so as to reduce the oxygen permeability and prolong the shelf life of the products; the heat-sealing layer is directly contacted with a packaged article, and has the functions of adaptability, permeability resistance, good heat sealing property, transparency, openness and the like. Existing stand-up pouches are typically compounded from different composite materials. Common composite film structures for use in stand-up bags are Polyester (PET)/Polyethylene (PE), PET/AL (aluminum foil)/PE, PET/AL/NY (nylon)/PE, and the like. The self-supporting bag film disclosed in CN104924712B, chinese patent, is similar to the above, and comprises a PET layer, a PET aluminum layer and a PE film in sequence; the PE film comprises a composite layer, a middle layer and a heat sealing layer which are sequentially overlapped, namely, only the inner layer of the self-supporting bag adopts the PE film. Such load-bearing stand-up bags comprise thermoplastics such as PET and PE gates, and the film layers cannot be completely separated or are costly to separate, making them difficult to separate and recycle. And the cost of directly using the bag body materials for plastic modification is high, even if the bag body materials are used for downshifting, the bag body materials are heated and melted again to form coarse and low-grade plastic products, the reutilization capability is also limited, and the bag body materials cannot be separately collected, simply and quickly recovered like common plastic tanks and plastic films of PET, PE and the like.
In the prior art, the PE film in the self-supporting bag is used as an inner film material close to one side of a packaged object, has low strength, mainly plays a role in heat sealing, and is difficult to independently bear the weight. Although PE is a material that meets the standards for food hygiene packaging very well, PET tensile strength is typically above 200MPa compared to pure PET, whereas PE tensile strength is an order of magnitude smaller. Although the strength of the PE film can be improved to a certain extent by increasing the thickness, the bag body which is too thick is still difficult to rot and dissipate for many years after being discarded from the packaging perspective, and is very harmful to the environment; and the PE bag body thickness is simply increased to improve the strength, so that the good heat-sealing of the self-standing bag is difficult to realize, the PE is easy to melt out to form a film defect, but the sealing effect of the bag body is poor, the food quality guarantee is influenced, and the method runs counter to the original intention of the design of the packaging bag.
Disclosure of Invention
Based on the fact that the full PE load-bearing self-standing packaging bag and the PE outer wrapping film with good load-bearing capacity are difficult to see in the prior art, the invention aims to overcome the defects in the prior art and provide the PE load-bearing base film for the full PE load-bearing self-standing bag with good mechanical property and heat sealing property.
It is another object of the present invention to provide an all-PE load-bearing stand-up pouch that has good mechanical and heat-sealing properties.
In order to realize the first purpose of the invention, the technical scheme of the invention is that the PE load-bearing base film for the full-PE load-bearing self-supporting bag is a three-layer co-extrusion blown film, and comprises a first surface layer, a middle layer and a second surface layer which are sequentially overlapped, wherein the first surface layer is composed of the following raw materials in percentage by weight: 43-59% of LLDPE, 40-50% of HDPE, 0.5-5% of crosslinked UHMWPE, 0.3-1.5% of flow promoter, 0.2-0.5% of nucleating agent, and the middle layer is composed of the following raw materials in percentage by weight: 48-64% of LLDPE, 35-45% of HDPE, 0.5-5% of cross-linked HDPE, 0.3-1.5% of flow promoter, 0.2-0.5% of nucleating agent, and the second surface layer is composed of the following raw materials in percentage by weight: 20-40% of LLDPE, 29.8-39.5% of HDPE, 30-40% of LDPE and 0.2-0.5% of nucleating agent.
The LLDPE is selected as a main material of the PE bearing base film, the crosslinked UHMWPE is added in the first surface layer, the crosslinked HDPE is added in the middle layer, a high-molecular-weight branched structure is added in the formula of the PE bearing base film, and the heat resistance protection with gradually increased heat resistance and the mechanical protection with gradually increased strength are formed from the second surface layer to the first surface layer by matching with the gradual increase of the HDPE content from the second surface layer to the first surface layer; the incremental heat-resistant protection ensures that the PE bearing base film is compounded with the PE heat-sealing film and the PE bearing base film can not melt out during heat sealing, thereby avoiding the defects of the film layer; the gradual and incremental mechanical protection is beneficial to preventing the leakage of the content after the PE bearing base film is made into the bag body, and the service durability of the bag body is improved; in addition, the added crosslinked UHMWPE and the crosslinked HDPE also play a role in improving the melt strength, and the defect of poor stability of the film bubble during LLDPE processing is overcome, so that the first surface layer and the middle layer can be stably blown into the film bubble under the condition that the LDPE with poor heat resistance and relatively low strength is not matched.
To improve processability, preferably the flow promoter is a polyethylene wax. The selected polyethylene wax has good compatibility with each component of the film layer, and particularly can promote the fluidity of the crosslinked UHMWPE and the crosslinked HDPE, and play a role in excellent internal lubrication. Polyethylene wax is used as the molecular PE material, and polyethylene wax is also selected as the flow promoter to facilitate the recovery of the self-supporting bag.
The nucleating agent is added, so that the crystallization speed can be accelerated, fine and compact spherulite particles are formed, molecular chains have high crystallization speed at a high temperature, regular spherulites are formed, and the transparency, the surface gloss and the mechanical property of the product are improved. Preferably, the nucleating agent is a polyvinyl high-molecular nucleating agent. The selected polyethylene-based high-molecular nucleating agent has good compatibility with all components of the film layer, can be uniformly dispersed in PE melt as tiny particles, cannot migrate and decompose, cannot reduce the transparency, and is also beneficial to the recovery of the self-supporting bag. The polyvinyl polymer nucleating agent may be selected from polyvinyl cyclohexane, etc.
The conventional UHMWPE has longer molecular chain and low branching degree, and only 0.3 side group is arranged on each main chain with 1000 carbon atoms, so the UHMWPE has high crystallization, and has outstanding density, rigidity, hardness and the like. Preferably, the degree of branching of the crosslinked UHMWPE is between 15 and 35 branches per 1000 carbon atoms. The UHMWPE with the increased branching degree still has thermoplasticity, and can obtain a proper melt flow rate by matching with an auxiliary agent so as to facilitate blow molding processing, thereby realizing the improvement of the strength and the heat resistance of a film layer. Further preferably, the preparation method of the crosslinked UHMWPE is: melt blending UHMWPE with a peroxide crosslinking agent; the peroxide crosslinking agent is peroxide dibenzoyl; the peroxide crosslinking agent is used in an amount of 0.01-0.1% by weight of the UHMWPE. UHMWPE is easily broken and degraded under the action of shearing force and heat. The crosslinking treatment is carried out by using the peroxide crosslinking agent in a molten state, and the crosslinking and the degradation are simultaneously carried out, so that the branched structure is increased, the molecular weight is not remarkably increased, and the thermoplastic influence on UHMWPE is small.
HDPE has high molecular weight, low branching, only 5-7 ethyl side chains per 1000 carbon atoms of the main chain, high crystallinity, and excellent density, rigidity, and hardness. Preferably, the crosslinked HDPE has a degree of branching of 15 to 35 branches per 1000 carbon atoms. By increasing the branching degree, stable blow molding bubble can be obtained, and further the strength and heat resistance of the film layer are improved. Further preferably, the preparation method of the crosslinked HDPE is as follows: the HDPE powder is irradiated by electron or gamma ray, and the irradiation dose of the electron or gamma ray is 2-10 kGy. After irradiation, a part of main chains or side chains in the HDPE molecular structure can be cut off by rays to generate a certain number of free radicals, the free radicals are combined with each other to form a cross-linked chain to form a branched macromolecular structure, and the physical properties such as the hardness of the film are improved to a certain extent. And HDPE crosslinking and chain scission can occur simultaneously after irradiation, so that the branched structure is increased, and the HDPE can still keep better thermoplasticity.
In order to achieve the second object of the invention, the technical scheme of the invention is that the full-PE load-bearing self-supporting bag is made of a PE composite film, the PE composite film comprises a PE heat-sealing film and the PE load-bearing base film, and the second surface layer of the PE load-bearing base film is printed and then bonded with the PE heat-sealing film through a PE laminating film. The special PE bearing base film is used as a bearing main body of the self-standing bag, so that the self-standing bag is endowed with excellent mechanical performance, and the heat resistance improved by the PE bearing base film enables the bag body not to easily generate film defects during heat sealing, so that good heat sealing is realized.
In order to adapt to processing, preferably, the PE heat-sealing film is a three-layer co-extrusion blown film, and includes a composite layer, a skeleton layer and a heat-sealing layer which are sequentially stacked, and the second surface layer of the PE load-bearing base film is printed and then bonded with the composite layer through a PE lamination. Thus, the PE heat-sealing film and the PE bearing base film are in the same layer number state, and the warping caused by compounding the PE heat-sealing film and the PE bearing base film is reduced.
Further preferably, the composite layer is composed of the following raw materials in percentage by weight: 60-70% of LLDPE and 78-40% of LDPE30, wherein the framework layer is composed of the following raw materials in percentage by weight: 20-40% of LLDPE, 29.8-39.5% of HDPE, 30-40% of LDPE and 0.2-0.5% of nucleating agent, wherein the heat-sealing layer is composed of the following raw materials in percentage by weight: 48.5-58.5% of LLDPE, 40-50% of LDPE, 1-1.2% of an opening agent and 0.3-0.5% of a slipping agent. The heat sealing temperature of the PE heat sealing film is adjusted through the formula design, and the PE load-bearing base film with improved heat resistance is matched, so that the high heat sealing strength is realized, and the surface of the self-supporting bag is kept smooth and flat. In the formula design, the PE heat-sealing film is compounded with the PE bearing base film by a composite layer and is heat-sealed by a heat-sealing layer; the framework layer plays a role in supporting the heat sealing film, the components of the framework layer of the PE heat sealing film are similar to those of the second surface layer of the PE bearing base film, a symmetrical structure on two sides of the printing layer is formed, and deformation of the printing pattern is avoided. The UHMWPE contained in the first surface layer also has the advantages of reducing the surface friction coefficient of the bag body, leading the surface of the bag body to be smooth and even,
the invention has the advantages and beneficial effects that: the invention designs an all-PE bearing self-supporting bag and a PE bearing base film mainly used for bearing, the obtained PE bearing base film can form heat-resistant gradient protection and mechanical gradient protection, has improved heat resistance and mechanical strength, is matched with a heat-sealing film, particularly the heat-sealing film with reduced heat-sealing temperature, and cannot generate PE melt fusion in the heat-sealing process, so that the original good properties of the all-PE bearing self-supporting bag still need to be kept after heat-sealing, and each film bubble has good stability during blow molding of the PE bearing base film, good film processability and high yield; the prepared full PE load-bearing self-supporting bag has high strength, good heat sealing performance and long service life, is green and environment-friendly, can be recycled as a PE material after being used, and has low recycling cost. Through the detection, the full PE load-bearing self-supporting bag can bear more than 2 kilograms.
Detailed Description
The following further describes embodiments of the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The embodiment of the invention discloses a PE bearing base film for a full PE bearing self-supporting bag, which is a three-layer co-extrusion blow molding film and comprises a first surface layer, a middle layer and a second surface layer which are sequentially overlapped.
The first surface layer is composed of the following raw materials in percentage by weight: 43-59% of LLDPE, 40-50% of HDPE, 0.5-5% of crosslinked UHMWPE, 0.3-1.5% of flow promoter and 0.2-0.5% of nucleating agent. The middle layer is composed of the following raw materials in percentage by weight: 48-64% of LLDPE, 35-45% of HDPE, 0.5-5% of cross-linked HDPE, 0.3-1.5% of flow promoter and 0.2-0.5% of nucleating agent. The second surface layer is composed of the following raw materials in percentage by weight: 20-40% of LLDPE, 29.8-39.5% of HDPE, 30-40% of LDPE and 0.2-0.5% of nucleating agent.
LLDPE has the characteristics of "rigidity in shear" and "softness in extension" and is very suitable for processing into films. However, the PE load-bearing base film does not participate in heat sealing and plays a role in bearing, the good heat sealability of the LLDPE serving as a main material becomes a defect to be overcome in the PE load-bearing base film, and the heat resistance and the strength of the LLDPE also need to be improved. Therefore, HDPE with longer molecular chain and higher crystallinity is added into three film layers of the PE load-bearing base film to increase the mechanical property of the film layers; the crosslinked UHMWPE added in the first surface layer and the crosslinked HDPE added in the middle layer further improve the strength and the heat resistance of the film layer. Here, crosslinked UHMWPE and crosslinked HDPE are chosen which contain a degree of branching of 15-35 branches per 1000 carbon atoms. The crosslinked UHMWPE and the crosslinked HDPE with the branching degree range also have good thermoplasticity, and have the functions of stabilizing the film bubble and overcoming the defects of poor stability of LLDPE film bubble. The LDPE in the second surface layer also serves to overcome the poor stability of the LLDPE film bubble.
Here, crosslinked UHMWPE is prepared by melt blending UHMWPE with 0.01-0.1% peroxide crosslinking agent by weight of UHMWPE; the peroxide crosslinking agent preferably adopts peroxide dibenzoyl to prepare crosslinked UHMWPE; crosslinked HDPE is prepared by irradiating HDPE powder with electrons or gamma rays at an irradiation dose of 2-10kGy to produce crosslinked HDPE.
The flow promoter may be selected from a variety of options to lubricate and promote the flow of the process of crosslinked UHMWPE and crosslinked HDPE. But polyethylene waxes which are also PE-based materials are preferred. Nucleating agents are added into all three film layers of the PE load-bearing base film, various options are available, and the PE load-bearing base film is preferably a polyvinyl high-molecular nucleating agent such as polyvinyl cyclohexane.
Through the technology, the PE bearing base film forms heat-resistant protection with gradually increased heat resistance from the second surface layer to the first surface layer and mechanical protection with gradually increased strength, prevents the leakage of the contents packaged in the later self-supporting bag, can effectively prevent PE from melting out when the PE bearing base film is compounded with the PE heat-sealing film and the self-supporting bag is subjected to heat sealing, and avoids the defects of uneven surface, uneven film performance and other film layers. And under the condition that only the second surface layer is added with LDPE with poor heat resistance, the films of all the film layers have good processing performance, stable film bubbles and uniform film performance.
The invention also provides the full PE load-bearing self-supporting bag. The full PE load-bearing self-supporting bag is made of a PE composite film, and the PE composite film comprises a PE heat-sealing film and the PE load-bearing base film.
The PE heat-sealing film is a three-layer co-extrusion blow-molding film and comprises a composite layer, a framework layer and a heat-sealing layer which are sequentially overlapped, and the second surface layer of the PE bearing base film is printed and then bonded together through a PE laminating film with the thickness of 10-30 microns. Wherein, the composite layer is composed of the following raw materials by weight percent: 60-70% of LLDPE and 30-40% of LDPE, and the framework layer is composed of the following raw materials in percentage by weight: 20-40% of LLDPE, 29.8-39.5% of HDPE, 30-40% of LDPE, 0.2-0.5% of nucleating agent, and the heat-sealing layer is composed of the following raw materials in percentage by weight: 48.5-58.5% of LLDPE, 40-50% of LDPE, 1-1.2% of an opening agent and 0.3-0.5% of a slipping agent. The opening agent is selected from conventional opening agent such as AB-20LD, and the slipping agent is selected from conventional slipping agent such as 10090-K.
In the following examples, the LLDPE was selected from seiko LL0209AA, unless otherwise specified; the LDPE is Yanshan LD66, the PE film is 1C7A of coating grade of mountain petrochemicals, the HDPE powder for crosslinking is DGDA6098 powder, and the HDPE powder except the HDPE powder is Sieke HD5401 AA; the UHMWPE for crosslinking is selected from U-PE 350; the flow promoting agent adopts polyethylene wax; the nucleating agent adopts polyvinyl cyclohexane; the opening agent is AB-20 LD; the slipping agent is 10090-K.
Example 1
And preparing the PE load-bearing base film. A three-layer co-extrusion blow molding device is used for preparing a three-layer co-extrusion blow molding film by respectively adding the following resin formula into three charging barrels, wherein the three-layer co-extrusion blow molding film comprises a first surface layer, a middle layer and a second surface layer which are sequentially overlapped. And melting the resins in the three charging barrels through an extruder to form a tube blank, blowing the tube blank into a film bubble, and cooling and shaping the film bubble to obtain the PE load-bearing base film. The formula of each layer is as follows:
the first surface layer is composed of the following raw materials in percentage by weight: 43% of LLDPE, 50% of HDPE, 5% of crosslinked UHMWPE, 1.5% of flow promoter and 0.5% of nucleating agent. Wherein, when the crosslinked UHMWPE is prepared, the dibenzoyl peroxide accounts for 0.1 percent of the weight of the UHMWPE.
The middle layer is composed of the following raw materials in percentage by weight: 48% of LLDPE, 45% of HDPE, 5% of cross-linked HDPE, 1.5% of flow promoter and 0.5% of nucleating agent. Wherein, the irradiation dose is 10kGy when the crosslinked HDPE is prepared.
The second surface layer is composed of the following raw materials in percentage by weight: 40% of LLDPE, 29.8% of HDPE, 30% of LDPE and 0.2% of nucleating agent.
A PE heat-seal film was prepared. A three-layer co-extrusion blow molding device is used for preparing a three-layer co-extrusion blow molding film by respectively adding the following resin formula into three charging barrels, wherein the three-layer co-extrusion blow molding film comprises a composite layer, a framework layer and a heat sealing layer which are sequentially overlapped. And melting the mixture by an extruder to form a tube blank, blowing the tube blank into a film bubble, and cooling and shaping the film bubble to obtain the PE heat-sealing film. The formula of each layer is as follows:
the composite layer is composed of the following raw materials in percentage by weight: 70% of LLDPE and 30% of LDPE.
The framework layer is composed of the following raw materials in percentage by weight: 20% of LLDPE, 39.5% of HDPE, 40% of LDPE and 0.5% of nucleating agent.
The heat sealing layer is composed of the following raw materials in percentage by weight: 58.5 percent of LLDPE, 40 percent of LDPE, 1 percent of opening agent and 0.5 percent of slipping agent
After obtaining a PE bearing base film and a PE heat-sealing film, printing a packaging pattern on a second surface layer of the PE bearing base film, after printing the second surface layer of the PE bearing base film, spraying a layer of PE spraying film of 10 microns on the surface of one printing side, then bonding a composite layer of the PE bearing base film and the PE heat-sealing film together through the PE spraying film to prepare a PE composite film, and manufacturing a full-PE bearing self-supporting bag by using the PE composite film.
Example 2
And preparing the PE load-bearing base film. A three-layer co-extrusion blow molding device is used for preparing a three-layer co-extrusion blow molding film by respectively adding the following resin formula into three charging barrels, wherein the three-layer co-extrusion blow molding film comprises a first surface layer, a middle layer and a second surface layer which are sequentially overlapped. And melting the resins in the three charging barrels through an extruder to form a tube blank, blowing the tube blank into a film bubble, and cooling and shaping the film bubble to obtain the PE load-bearing base film. The formula of each layer is as follows:
the first surface layer is composed of the following raw materials in percentage by weight: 52% of LLDPE, 45% of HDPE, 2% of crosslinked UHMWPE, 0.7% of flow promoter and 0.3% of nucleating agent. Wherein, when the crosslinked UHMWPE is prepared, the dibenzoyl peroxide accounts for 0.05 percent of the weight of the UHMWPE.
The middle layer is composed of the following raw materials in percentage by weight: 56% of LLDPE, 40% of HDPE, 3% of cross-linked HDPE, 0.7% of flow promoter and 0.3% of nucleating agent. Wherein, the irradiation dose is 5kGy when the crosslinked HDPE is prepared.
The second surface layer is composed of the following raw materials in percentage by weight: 30% of LLDPE, 34.7% of HDPE, 35% of LDPE and 0.3% of nucleating agent.
A PE heat-seal film was prepared. A three-layer co-extrusion blow molding device is used for preparing a three-layer co-extrusion blow molding film by respectively adding the following resin formula into three charging barrels, wherein the three-layer co-extrusion blow molding film comprises a composite layer, a framework layer and a heat sealing layer which are sequentially overlapped. And melting the mixture by an extruder to form a tube blank, blowing the tube blank into a film bubble, and cooling and shaping the film bubble to obtain the PE heat-sealing film. The formula of each layer is as follows:
the composite layer is composed of the following raw materials in percentage by weight: 65% of LLDPE and 35% of LDPE.
The framework layer is composed of the following raw materials in percentage by weight: 30% of LLDPE, 34.7% of HDPE, 35% of LDPE and 0.3% of nucleating agent.
The heat sealing layer is composed of the following raw materials in percentage by weight: 53.5% of LLDPE, 45% of LDPE, 1.1% of an opening agent and 0.4% of a slipping agent.
After obtaining a PE bearing base film and a PE heat-sealing film, printing a packaging pattern on a second surface layer of the PE bearing base film, after printing the second surface layer of the PE bearing base film, spraying a layer of 20-micrometer PE spraying film on the surface of one printing side, then bonding a composite layer of the PE bearing base film and the PE heat-sealing film together through the PE spraying film to prepare a PE composite film, and manufacturing a full-PE bearing self-supporting bag by using the PE composite film.
Example 3
And preparing the PE load-bearing base film. A three-layer co-extrusion blow molding device is used for preparing a three-layer co-extrusion blow molding film by respectively adding the following resin formula into three charging barrels, wherein the three-layer co-extrusion blow molding film comprises a first surface layer, a middle layer and a second surface layer which are sequentially overlapped. And melting the resins in the three charging barrels through an extruder to form a tube blank, blowing the tube blank into a film bubble, and cooling and shaping the film bubble to obtain the PE load-bearing base film. The formula of each layer is as follows:
the first surface layer is composed of the following raw materials in percentage by weight: 59% of LLDPE, 40% of HDPE, 0.5% of crosslinked UHMWPE, 0.3% of flow promoter and 0.2% of nucleating agent. Wherein, when the crosslinked UHMWPE is prepared, the dibenzoyl peroxide accounts for 0.01 percent of the weight of the UHMWPE.
The middle layer is composed of the following raw materials in percentage by weight: 64% of LLDPE, 35% of HDPE, 0.5% of cross-linked HDPE, 0.3% of flow promoter and 0.2% of nucleating agent. Wherein, the irradiation dose is 2kGy when the crosslinked HDPE is prepared.
The second surface layer is composed of the following raw materials in percentage by weight: 40% of LLDPE, 29.8% of HDPE, 30% of LDPE and 0.2% of nucleating agent.
A PE heat-seal film was prepared. A three-layer co-extrusion blow molding device is used for preparing a three-layer co-extrusion blow molding film by respectively adding the following resin formula into three charging barrels, wherein the three-layer co-extrusion blow molding film comprises a composite layer, a framework layer and a heat sealing layer which are sequentially overlapped. And melting the mixture by an extruder to form a tube blank, blowing the tube blank into a film bubble, and cooling and shaping the film bubble to obtain the PE heat-sealing film. The formula of each layer is as follows:
the composite layer is composed of the following raw materials in percentage by weight: 60% of LLDPE and 40% of LDPE.
The framework layer is composed of the following raw materials in percentage by weight: 40% of LLDPE, 29.8% of HDPE, 30% of LDPE and 0.2% of nucleating agent.
The heat sealing layer is composed of the following raw materials in percentage by weight: 48.5 percent of LLDPE, 50 percent of LDPE, 1 to 1.2 percent of opening agent and 0.3 percent of slipping agent.
After obtaining a PE bearing base film and a PE heat-sealing film, printing a packaging pattern on a second surface layer of the PE bearing base film, after printing the second surface layer of the PE bearing base film, spraying a layer of PE spraying film of 30 micrometers on the surface of one printing side, then adhering a composite layer of the PE bearing base film and the PE heat-sealing film together through the PE spraying film to prepare a PE composite film, and manufacturing a full-PE bearing self-supporting bag by using the PE composite film.
Comparative example 1
A free-standing pouch was made from 2 PE heat-seal films prepared according to example 3, the heat-seal layer of one PE heat-seal film and the composite layer of the other PE heat-seal film being bonded together by a 10 micron PE laminate.
The stability of the blown film bubble of each layer of the PE load-bearing base film in the examples 1-3 is observed, and the prepared PE load-bearing base film is subjected to mechanical property test, and the result is shown in Table 1; the PE heat-sealable films obtained in examples 1 to 3 were subjected to mechanical property tests for comparison, and the results are also shown in Table 1.
After the self-supporting bags were produced for examples 1 to 3 and comparative example 1, the heat-sealed portions of the self-supporting bags were observed. And the bag was filled with 500g of water, sealed and tested according to GB/T1005-1998 pressure test method. The test results are shown in Table 2.
TABLE 1
TABLE 2
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a full PE bearing self-reliance PE bearing base film for bag which characterized in that, PE bearing base film is three-layer coextrusion blown film, including superimposed first superficial layer, intermediate level and second superficial layer in proper order, first superficial layer comprises following weight percent's raw materials: 43-59% of LLDPE, 40-50% of HDPE, 0.5-5% of crosslinked UHMWPE, 0.3-1.5% of flow promoter, 0.2-0.5% of nucleating agent, and the middle layer is composed of the following raw materials in percentage by weight: 48-64% of LLDPE, 35-45% of HDPE, 0.5-5% of cross-linked HDPE, 0.3-1.5% of flow promoter, 0.2-0.5% of nucleating agent, and the second surface layer is composed of the following raw materials in percentage by weight: 20-40% of LLDPE, 29.8-39.5% of HDPE, 30-40% of LDPE and 0.2-0.5% of nucleating agent.
2. A PE load-bearing base film for an all-PE load-bearing stand-up pouch according to claim 1 wherein said flow promoter is polyethylene wax.
3. The PE load-bearing base film for an all-PE load-bearing stand-up pouch of claim 1, wherein the nucleating agent is a polyethylene-based polymeric nucleating agent.
4. The PE load-bearing base film for an all-PE load-bearing stand-up pouch according to claim 1, wherein the crosslinked UHMWPE has a branching degree of 15 to 35 branches per 1000 carbon atoms.
5. The PE load-bearing base film for the all-PE load-bearing stand-up pouch according to claim 4, wherein the crosslinked UHMWPE is prepared by: melt blending UHMWPE with a peroxide crosslinking agent; the peroxide crosslinking agent is peroxide dibenzoyl; the peroxide crosslinking agent is used in an amount of 0.01-0.1% by weight of the UHMWPE.
6. The PE load-bearing base film for an all-PE load-bearing stand-up bag of claim 1, wherein the crosslinked HDPE has a branching degree of 15 to 35 branches per 1000 carbon atoms.
7. The PE load-bearing base film for the all-PE load-bearing stand-up pouch of claim 6, wherein the crosslinked HDPE is prepared by: the HDPE powder is irradiated by electron or gamma ray, and the irradiation dose of the electron or gamma ray is 2-10 kGy.
8. An all-PE load-bearing stand-up pouch made of a PE composite film comprising a PE heat-seal film and the PE load-bearing base film of any one of claims 1-7, wherein the second surface layer of the PE load-bearing base film is printed and then bonded to the PE heat-seal film by a PE shower film.
9. The polyethylene load-bearing self-supporting bag according to claim 8, wherein the PE heat-sealing film is a three-layer co-extrusion blown film comprising a composite layer, a framework layer and a heat-sealing layer which are sequentially laminated, and the second surface layer of the PE load-bearing base film is printed and then is thermally bonded with the composite layer through PE film lamination adhesion.
10. A polyethylene load-bearing stand-up pouch according to claim 9, wherein said composite layer is comprised of the following raw materials in weight percent: 60-70% of LLDPE and 30-40% of LDPE, wherein the framework layer is composed of the following raw materials in percentage by weight: 20-40% of LLDPE, 29.8-39.5% of HDPE, 30-40% of LDPE and 0.2-0.5% of nucleating agent, wherein the heat-sealing layer is composed of the following raw materials in percentage by weight: 48.5-58.5% of LLDPE, 40-50% of LDPE, 1-1.2% of an opening agent and 0.3-0.5% of a slipping agent.
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| CN113997665A (en) * | 2021-10-15 | 2022-02-01 | 江苏利特尔绿色包装股份有限公司 | Homogeneous olefin packaging self-supporting bag and preparation method thereof |
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