CN210285289U

CN210285289U - Environment-friendly antibacterial preservative film

Info

Publication number: CN210285289U
Application number: CN201920682728.5U
Authority: CN
Inventors: 吴永鑫; 钟元杰; 康朝晖; 林文端
Original assignee: Jinda Nano Tech Xiamen Co ltd
Current assignee: Jinda Nano Tech Xiamen Co ltd
Priority date: 2019-05-13
Filing date: 2019-05-13
Publication date: 2020-04-10
Anticipated expiration: 2029-05-13

Abstract

The utility model relates to an antibiotic plastic wrap of environmental protection, including top layer, sandwich layer and the bottom that stacks gradually, wherein the sandwich layer sets up discontinuously the top layer with between the bottom, the top layer is polyethylene and polyhydroxyalkanoate mixture layer, the sandwich layer is polyethylene and inorganic antibiotic powder mixture layer, the bottom includes high density polyethylene. The environment-friendly antibacterial preservative film is made of non-toxic raw materials, high in safety, food-grade, durable and stable in antibacterial effect, low in production cost and good in breathability, and can start to be subjected to microbial degradation from the surface layer after being used up.

Description

Environment-friendly antibacterial preservative film

Technical Field

The utility model relates to a membrane product, especially an antibiotic plastic wrap of environmental protection.

Background

The preservative film is used for packaging food, is convenient and quick, can slow down the water volatilization of the food, and prolongs the shelf life to a certain extent. Generally, the preservative films comprise three types of PE, PVC and PVDC, and with the increasing demand for food safety at present, the preservative films made of PVC gradually fade out of the field of food packaging due to the toxic substances contained in the preservative films. The preservative film on the market at present is mainly made of PE (polyethylene), and has excellent chemical stability, good toughness and tensile resistance. However, after the preservative film is contacted with food, bacteria are easy to breed and mildew, and in addition, the common PE film has poor air permeability, the propagation of anaerobic bacteria is accelerated in a closed system, so that the preservation of the food is not facilitated.

Chinese utility model patent CN203651118U discloses an antibacterial and mould-proof plastic wrap, including: the preservative film comprises a preservative film base layer, wherein a plurality of micropores are formed in the preservative film base layer, and a chitosan antibacterial layer is arranged on one side of the preservative film base layer. The preservative film is not stretch-proof, and the antibacterial effect of the chitosan is not durable, so that the transparency of the product is also adversely affected.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides an antibiotic plastic wrap of environmental protection has three layer construction: the surface layer is formed by a mixture of polyethylene and polyhydroxyalkanoate, so that the surface layer has the advantages of a polyethylene film, and polyhydroxyalkanoate is added, so that the product has biodegradable performance in a natural environment, and the environment-friendly concept is met. The core layer mainly plays an antibacterial role, and the inorganic antibacterial powder is adopted, so that the safety and heat resistance are extremely high, the stability is also extremely good, the transparency is better, and the influence on the transparency of the product after the core layer is mixed with PE is small. The bottom layer is in contact with food in use, and the high density polyethylene has heat resisting effect, and can be used for packaging cooked food at 120 deg.C or below.

The utility model discloses in, the top layer is with polyethylene and polyhydroxy fatty acid ester mixture, and the sandwich layer is with polyethylene and the mixing of inorganic antibiotic powder, adds the hopper respectively with the bottom raw materials at last, prepares according to conventional three-layer crowded technology altogether.

In order to solve the technical problem, the utility model discloses take following scheme:

the utility model provides an antibiotic plastic wrap of environmental protection, is including the top layer, sandwich layer and the bottom that stacks gradually, wherein the sandwich layer sets up discontinuously the top layer with between the bottom, the top layer is polyethylene and polyhydroxyalkanoate mixture layer, the sandwich layer is polyethylene and the antibiotic powder mixture layer of inorganic, the bottom includes high density polyethylene.

Further, the surface layer is a thin layer composed of a mixture of linear low density polyethylene and polyhydroxyalkanoate.

Further, the thickness of the surface layer is 2-10 μm.

Furthermore, the core layer is distributed in a strip shape, and the extending direction of the core layer is perpendicular to the extending direction of the environment-friendly antibacterial preservative film.

Further, the inorganic antibacterial powder in the core layer is a mixture of silicate-supported silver and silicate-supported zinc, and the particle size is 1-3 μm.

Further, the inorganic antibacterial powder in the core layer is Jinda nanometer functional powder JDGKP-002.

Further, the thickness of the core layer is 5-10 μm.

Further, the bottom layer is a mixture layer of high-density polyethylene and straw fiber.

Further, the thickness of the bottom layer is 0.5-4 μm.

Furthermore, the thickness of the environment-friendly antibacterial preservative film is 10-20 μm.

Through adopting aforementioned technical scheme, the utility model discloses compare with prior art, adopt the top layer that contains polyhydroxyalkanoate, make the plastic wrap can begin to carry out microbial degradation by the top layer under natural state. The core layer made of the inorganic antibacterial powder is utilized to exert the antibacterial effect; furthermore, the core layer adopts a discontinuous design, so that the raw material cost is saved, and the air permeability of the whole film layer is improved.

Preferably, the sandwich layer distributes for the banding, and is perpendicular with the extending direction of sandwich layer design into with the extending direction of the antibiotic plastic wrap of environmental protection, and the marginal line of usable sandwich layer carries out the straight line and tears, and the plastic wrap is cuted to the bare-handed of being convenient for, facilitates the use.

Finally, the bottom layer of the environment-friendly antibacterial preservative film adopts high-density polyethylene, and can resist the high temperature of 100 plus 120 ℃. Preferably, the bottom layer is formed by a mixture of high-density polyethylene and straw fibers, the straw fibers are renewable resources, and the straw fibers not only further reduce the production cost, but also have the effect of improving the ventilation effect of the bottom layer.

Drawings

FIG. 1 is a schematic view of the structure of an environmentally friendly antibacterial plastic wrap provided in embodiment 1 of the present invention;

fig. 2 is a schematic view of a top view structure of an environment-friendly antibacterial plastic wrap provided by embodiment 1 of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings and detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1, the environment-friendly antibacterial preservative film is prepared by sequentially laminating a surface layer 1, a core layer 2 and a bottom layer 3, wherein the thicknesses are 5 micrometers, 5 micrometers and 3 micrometers, and adopting a three-layer co-extrusion process. The surface layer 1 is formed by a mixture of polyethylene and polyhydroxyalkanoate (weight ratio of polyethylene to polyhydroxyalkanoate is 1:1), the core layer 2 is discontinuously arranged between the surface layer 1 and the bottom layer 3, the core layer 2 is in a mutually parallel strip shape, the extending direction of the core layer 2 is perpendicular to the extending direction of the environment-friendly antibacterial preservative film (see figure 2), an interlayer formed by the core layer 2 is formed by a mixture of polyethylene and inorganic antibacterial powder, preferably, large nanometer functional powder JDGKP-002 is added in an amount of 1% of polyethylene, and silver, zinc and the like with antibacterial action are uniformly distributed to particles with silicate bonding action with durability in a stable form. It belongs to inorganic class, so that it is high in safety and heat-resisting property, and its stability is excellent, and it has no any harm to human body and environment.

It should be noted that the antibacterial property of the interlayer 2 with antibacterial effect mainly aims at harmful bacteria such as escherichia coli, staphylococcus aureus, candida albicans and the like, and does not interfere with the metabolism of microorganisms degrading the preservative film.

The discontinuous design of the core layer 2 enables the product to have difference in thickness in the longitudinal direction, the difference is not easy to identify by naked eyes, but due to the small difference in thickness, the preservative film can be torn at the discontinuous position of the core layer 2 during use, and the product has an easy tearing effect.

The bottom layer 3 adopts high-density polyethylene, the heat-resistant temperature is 100-120 ℃, and the bottom layer can be used for directly packaging cooked food.

Example 2:

this example is substantially the same as example 1 except that the bottom layer 3 is formed by mixing high density polyethylene and straw fibers, and the straw fibers account for 20 wt% of the high density polyethylene in the bottom layer 3. The regeneration of the wheat straw fiber is utilized, the cost of raw materials can be reduced, the air permeability of the product is enhanced, the bottom layer containing the wheat straw fiber can also promote the microbial degradation of the product, and a good substance metabolism basis is provided for degrading microbes.

Example 3:

an environment-friendly antibacterial preservative film is prepared by sequentially laminating a surface layer 1, a core layer 2 and a bottom layer 3, wherein the thicknesses are 10 micrometers, 10 micrometers and 4 micrometers, and adopting a three-layer co-extrusion process. The surface layer 1 is formed by a mixture of linear low-density polyethylene and polyhydroxyalkanoate, the core layer 2 is discontinuously arranged between the surface layer 1 and the bottom layer 3 and is in a mutually parallel strip shape, the extending direction of the core layer 2 is vertical to the extending direction of the environment-friendly antibacterial preservative film, an interlayer formed by the core layer 2 is formed by a mixture of polyethylene and inorganic antibacterial powder, the inorganic antibacterial powder is preferably a mixture of silicate-loaded silver and silicate-loaded zinc, the particle size is 1-3 mu m, and the adding amount is 2 wt% of the polyethylene in the core layer 2. The bottom layer 3 is made of high density polyethylene.

The product in this example had better strength and rigidity than example 1.

Example 4:

an environment-friendly antibacterial preservative film is prepared by sequentially laminating a surface layer 1, a core layer 2 and a bottom layer 3, wherein the thicknesses are 5 micrometers, 6 micrometers and 0.5 micrometer in sequence, and adopting a three-layer co-extrusion process. Wherein, the surface layer 1 is composed of linear low density polyethylene and polyhydroxyalkanoate mixture, the core layer 2 is discontinuously arranged between the surface layer 1 and the bottom layer 3, the interlayer composed of the core layer 2 is composed of polyethylene and inorganic antibacterial powder mixture, the inorganic antibacterial powder is preferably mixture of silicate-carried silver and silicate-carried zinc, the grain diameter is 1 μm, and the addition amount is 1 wt% of the polyethylene in the core layer 2. The bottom layer 3 is made of high density polyethylene.

The product of this embodiment has ultra-thin, antibiotic effect, is applicable to the encapsulation of fruit.

Example 5:

an environment-friendly antibacterial preservative film is prepared by sequentially laminating a surface layer 1, a core layer 2 and a bottom layer 3, wherein the thicknesses are sequentially 2 micrometers, 8 micrometers and 2 micrometers, and a three-layer co-extrusion process is adopted. Wherein, the surface layer 1 is composed of linear low density polyethylene and polyhydroxyalkanoate mixture, the core layer 2 is discontinuously arranged between the surface layer 1 and the bottom layer 3, the interlayer composed of the core layer 2 is composed of polyethylene and inorganic antibacterial powder mixture, the inorganic antibacterial powder is preferably mixture of silicate-carried silver and silicate-carried zinc, the grain diameter is 1 μm, and the addition amount is 1 wt% of the polyethylene in the core layer 2. The bottom layer 3 is formed by a mixture of high-density polyethylene and wheat straw fibers, and the wheat straw fibers account for 15 wt% of the high-density polyethylene in the bottom layer 3.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims

1. An environment-friendly antibacterial preservative film is characterized in that: including top layer, sandwich layer and the bottom that stacks gradually, wherein the sandwich layer sets up discontinuously the top layer with between the bottom, the top layer is polyethylene and polyhydroxyalkanoate mixture layer, the sandwich layer is polyethylene and inorganic antibiotic powder mixture layer, the bottom is the mixture layer of high density polyethylene and wheat straw fiber.

2. The environmental-friendly antibacterial preservative film according to claim 1, characterized in that: the surface layer is a thin layer composed of a mixture of linear low-density polyethylene and polyhydroxyalkanoate.

3. The environmentally friendly antibacterial cling film of claim 1 or 2, wherein: the thickness of the surface layer is 2-10 μm.

4. The environmental-friendly antibacterial preservative film according to claim 1, characterized in that: the core layer is distributed in a strip shape, and the extending direction of the core layer is perpendicular to the extending direction of the environment-friendly antibacterial preservative film.

5. The environmental-friendly antibacterial preservative film according to claim 1, characterized in that: the inorganic antibacterial powder in the core layer is a mixture of silicate-carried silver and silicate-carried zinc, and the particle size is 1-3 mu m.

6. The environmentally friendly antibacterial plastic wrap of claim 5, wherein: the inorganic antibacterial powder in the core layer is Jinda nano functional powder JDGKP-002.

7. The environmentally friendly antibacterial cling film of claim 1 or 4, wherein: the thickness of the core layer is 5-10 μm.

8. The environmental-friendly antibacterial preservative film according to claim 1, characterized in that: the thickness of the bottom layer is 0.5-4 μm.

9. The environmental-friendly antibacterial preservative film according to claim 1, characterized in that: the thickness of the environment-friendly antibacterial preservative film is 10-20 mu m.