Antibacterial degradable plastic meal box and preparation method thereof

Abstract

The invention provides an antibacterial degradable plastic meal box, which is prepared from the following ingredients in parts by mass: 45 to 60 parts of T30S polypropylene, 25 to 35 parts of 1080 polypropylene, 7 to 9 parts of ethylene copolymers, 11 to 13 parts of inorganic fillers, 0.3 to 10 parts of antibacterial agents and 0.3 to 3 parts of white oil. The invention also provides a preparation method of the antibacterial degradable plastic meal box. Compared with the prior art, the problems that an existing plastic meal box is low in degradation rate and poor in antibacterial effect can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of packaging boxes, and in particular to an antibacterial degradable plastic lunch box and a preparation method thereof. Background Art

[0002] As people's lives and culture become more colorful and complicated with the development of industry, various types of disposable tableware have emerged in order to save time, including spoons, cups, plates, lunch baskets and other disposable necessities. The application of disposable tableware brings convenience and speed to people's lives while preventing cross-transmission of diseases, which is deeply welcomed by consumers and catering operators. Currently, the widely used disposable plastic tableware is mainly made of polystyrene, which is not degradable and has poor antibacterial effect. Summary of the invention

[0003] The purpose of the present invention is to solve the problems of low degradation rate and poor antibacterial effect of existing plastic lunch boxes, and to provide an antibacterial degradable plastic lunch box and a preparation method thereof.

[0004] In order to achieve the above-mentioned objectives, on the one hand, the present invention provides an antibacterial degradable plastic lunch box, which is composed of the following components, by mass: 45-60 parts of T30S polypropylene, 25-35 parts of 1080 polypropylene, 7-9 parts of ethylene copolymer, 11-13 parts of inorganic filler, 0.3-10 parts of antibacterial agent, and 0.3-3 parts of white oil.

[0005] As a further description of the above technical solution:

[0006] In parts by mass, the T30S polypropylene comprises 50 parts, 1080 polypropylene comprises 30 parts, ethylene copolymer comprises 8 parts, inorganic filler comprises 12.5 parts, antibacterial agent comprises 3 parts, and white oil comprises 0.5 parts.

[0007] As a further description of the above technical solution:

[0008] The ethylene copolymer is one or more of ethylene-vinyl alcohol copolymer and ethylene-vinyl acetate copolymer.

[0009] As a further description of the above technical solution:

[0010] The antibacterial agent consists of antibacterial powder and a carrier and is obtained by modification with vinyl triethoxysilane.

[0011] As a further description of the above technical solution:

[0012] The antibacterial powder is one of nano silver powder, nano copper powder and nano zinc powder; the carrier is one of zeolite, calcium phosphate, zirconium phosphate, hydroxyapatite, bentonite, talc, soluble glass, silica gel, alumina and activated carbon.

[0013] As a further description of the above technical solution:

[0014] The antibacterial agent is extracted from plants containing antibacterial components, and the plants containing antibacterial components are truncatum, juniper, camellia oil, cotinus coggygria, rehmannia root, orange peel, phellodendron, barberry and turmeric.

[0015] As a further description of the above technical solution:

[0016] The method for extracting the antibacterial agent comprises: washing, drying and crushing plants containing effective antibacterial ingredients; ultrasonically extracting the crushed plants with ethanol at a solid-liquid ratio of 1:60 by mass at 25-75°C for 0.1-18h, cooling to room temperature, filtering, concentrating the filtrate, and freeze-drying to obtain a powdered antibacterial agent.

[0017] As a further description of the above technical solution:

[0018] The photosensitizer is one or more of cerium stearate, benzophenone or iron dialkyl dithiocarbamate.

[0019] On the other hand, the present invention also provides a method for preparing an antibacterial degradable plastic lunch box, which comprises the following steps:

[0020] S1: preparing an antibacterial agent, wherein the antibacterial agent is extracted from a plant containing an antibacterial component;

[0021] S2: 50 parts of polypropylene, 30 parts of 1080 polypropylene, 8 parts of ethylene copolymer, 12.5 parts of inorganic filler, 3 parts of antibacterial agent and 0.5 parts of white oil are mixed and stirred to obtain a mixture;

[0022] S3: adding an antibacterial agent and a photosensitizer to the mixture in step S2, and then adding an appropriate amount of starch to make a smooth dough, applying silicone oil on the inner wall and screw of the extruder, extruding into strips by an extruder, cutting into pellets, and drying to obtain a plastic masterbatch;

[0023] S4: Extruding the plastic masterbatch into plastic material by a screw extruder, and then blow-molding the plastic material into a packaging box, wherein the screw temperature of the screw extruder is 120-240° C.

[0024] As a further description of the above technical solution:

[0025] The processing temperature of the screw extruder is: zone 1 temperature is 192°C, zone 2 temperature is 212°C, zone 3 temperature is 230°C, zone 4 temperature is 212°C, zone 5 temperature is 215°C, zone 6 temperature is 220°C, zone 7 temperature is 230°C, and the main engine speed is 300-400 rpm.

[0026] In summary, due to the adoption of the above technical scheme, the beneficial effects of the present invention are: the main components of the packaging box made in the present invention are T30S polypropylene, 1080 polypropylene, ethylene copolymer, inorganic filler, antibacterial agent and white oil, and the addition of antibacterial agent can effectively inhibit the reproduction of bacteria on the plastic surface. The antibacterial agent after ethylene copolymer has better compatibility with plastic, is not easy to fall off the plastic surface, plays a long-term and continuous antibacterial effect, and is more beneficial to the health of consumers. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in detail below.

[0028] The invention provides an antibacterial degradable plastic lunch box and a preparation method thereof. The antibacterial degradable plastic lunch box is composed of the following components, measured by weight: 45-60 parts of T30S polypropylene, 25-35 parts of 1080 polypropylene, 7-9 parts of ethylene copolymer, 11-13 parts of inorganic filler, 0.3-10 parts of antibacterial agent and 0.3-3 parts of white oil.

[0029] In parts by mass, the T30S polypropylene comprises 50 parts, 1080 polypropylene comprises 30 parts, ethylene copolymer comprises 8 parts, inorganic filler comprises 12.5 parts, antibacterial agent comprises 3 parts, and white oil comprises 0.5 parts.

[0030] The ethylene copolymer is one or more of ethylene-vinyl alcohol copolymer and ethylene-vinyl acetate copolymer, has good high temperature resistance, does not deform when exposed to high temperature, and has good antibacterial effect.

[0031] In one embodiment, the antibacterial agent is composed of antibacterial powder and a carrier, and is obtained by modification with vinyltriethoxysilane.

[0032] The antibacterial powder is one of nano silver powder, nano copper powder and nano zinc powder; the carrier is one of zeolite, calcium phosphate, zirconium phosphate, hydroxyapatite, bentonite, talc, soluble glass, silica gel, alumina and activated carbon.

[0033] In another embodiment, the antibacterial agent is extracted from plants containing antibacterial ingredients, and the plants containing antibacterial ingredients are Atractylodes macrocephala, Juniper, Camellia oil, Cotinus coggygria, Rehmannia glutinosa, Citrus aurantium, Phellodendron chinense, Berberis bark and Turmeric.

[0034] The method for extracting the antibacterial agent comprises: washing, drying and crushing plants containing effective antibacterial ingredients; ultrasonically extracting the crushed plants with ethanol at a solid-liquid ratio of 1:60 by mass at 25-75°C for 0.1-18h, cooling to room temperature, filtering, concentrating the filtrate, and freeze-drying to obtain a powdered antibacterial agent.

[0035] A variety of biodegradable plastics with antibacterial properties and added with antibacterial plant active ingredients are prepared, which are not only biodegradable but also have good antibacterial properties and are more environmentally friendly and safe.

[0036] The invention also includes a photosensitizer, which is one or more of cerium stearate, benzophenone or dialkyl dithiocarbamate iron. Under natural conditions, it can be degraded quickly by the action of light and organisms, which is beneficial to environmental protection.

[0037] In summary, due to the adoption of the above technical scheme, the beneficial effects of the present invention are: the main components of the packaging box made in the present invention are T30S polypropylene, 1080 polypropylene, ethylene copolymer, inorganic filler, antibacterial agent and white oil, and the addition of antibacterial agent can effectively inhibit the reproduction of bacteria on the plastic surface. The antibacterial agent after ethylene copolymer has better compatibility with plastic, is not easy to fall off the plastic surface, plays a long-term and continuous antibacterial effect, and is more beneficial to the health of consumers.

[0038] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto:

[0039] Example 1

[0040] Embodiment 1 provides an antibacterial degradable plastic lunch box and a preparation method thereof, comprising the following steps:

[0041] S1: preparing an antibacterial agent, wherein the antibacterial agent is extracted from a plant containing an antibacterial component;

[0042] S2: 50 parts of polypropylene, 30 parts of 1080 polypropylene, 8 parts of ethylene copolymer, 12.5 parts of inorganic filler, 3 parts of antibacterial agent and 0.5 parts of white oil are mixed and stirred to obtain a mixture;

[0043] S3: adding an antibacterial agent and a photosensitizer to the mixture in step S2, and then adding an appropriate amount of starch to make a smooth dough, applying silicone oil on the inner wall and screw of the extruder, extruding into strips by an extruder, cutting into pellets, and drying to obtain a plastic masterbatch;

[0044] S4: Extruding the plastic masterbatch into plastic material by a screw machine, and then blow-molding the plastic material into a packaging box, wherein the screw temperature of the screw extruder is 120-240°C.

[0045] The processing temperature of the screw extruder is: zone 1 temperature is 192°C, zone 2 temperature is 212°C, zone 3 temperature is 230°C, zone 4 temperature is 212°C, zone 5 temperature is 215°C, zone 6 temperature is 220°C, zone 7 temperature is 230°C, and the main engine speed is 300-400 rpm.

[0046] Example 2

[0047] Embodiment 2 provides an antibacterial degradable plastic lunch box and a preparation method thereof, comprising the following steps:

[0048] S1: 50 parts of polypropylene, 30 parts of 1080 polypropylene, 8 parts of ethylene copolymer, 12.5 parts of inorganic filler and 0.5 parts of white oil were mixed and stirred to obtain a mixture;

[0049] S3: adding a photosensitizer to the mixture in step S2, and then adding an appropriate amount of starch to make a smooth dough, applying silicone oil on the inner wall and screw of the extruder, extruding into strips by an extruder, cutting into pellets, and drying to obtain a plastic masterbatch;

[0050] S4: Extruding the plastic masterbatch into plastic material by a screw machine, and then blow-molding the plastic material into a packaging box, wherein the screw temperature of the screw extruder is 120-240°C.

[0051] The processing temperature of the screw extruder is: zone 1 temperature is 192°C, zone 2 temperature is 212°C, zone 3 temperature is 230°C, zone 4 temperature is 212°C, zone 5 temperature is 215°C, zone 6 temperature is 220°C, zone 7 temperature is 230°C, and the main engine speed is 300-400 rpm.

[0052] Example 3

[0053] Embodiment 3 provides an antibacterial degradable plastic lunch box and a preparation method thereof, comprising the following steps:

[0054] S1: preparing an antibacterial agent, wherein the antibacterial agent is extracted from a plant containing an antibacterial component;

[0055] S2: 50 parts of polypropylene, 30 parts of 1080 polypropylene, 8 parts of ethylene copolymer, 12.5 parts of inorganic filler, 3 parts of antibacterial agent and 0.5 parts of white oil are mixed and stirred to obtain a mixture;

[0056] S3: adding an antibacterial agent to the mixture in step S2, and then adding an appropriate amount of starch to make a smooth dough, applying silicone oil on the inner wall and screw of the extruder, extruding into strips by an extruder, cutting into pellets, and drying to obtain a plastic masterbatch;

[0057] S4: Extruding the plastic masterbatch into plastic material by a screw machine, and then blow-molding the plastic material into a packaging box, wherein the screw temperature of the screw extruder is 120-240°C.

[0058] The processing temperature of the screw extruder is: zone 1 temperature is 192°C, zone 2 temperature is 212°C, zone 3 temperature is 230°C, zone 4 temperature is 212°C, zone 5 temperature is 215°C, zone 6 temperature is 220°C, zone 7 temperature is 230°C, and the main engine speed is 300-400 rpm.

[0059] In the above-mentioned embodiment of the present invention, the antibacterial effect of environmentally friendly plastics - antibacterial performance test method and antibacterial effect test and evaluation of the antibacterial effect of the light industry standard QB / T2591-2003 of the People's Republic of China is adopted. The antibacterial plastics whose antibacterial rate meets I>99% can be reported as having strong antibacterial effect; the antibacterial plastics whose antibacterial rate meets II>90% can be reported as having antibacterial effect.

[0060] The method for calculating the degradation rate in the above embodiment of the present invention is: put the prepared environmentally friendly plastic into compost, activated sludge, and soil in a certain proportion, take samples every 7 days to record the mass loss (three parallel samples for each sample), and take samples continuously for 6 months. The mass loss rate formula is: D = (m0-mt) / m0×100%; where m0 is the original mass of the film before degradation; mt is the remaining mass of the film after degradation for t days, and the results are shown in the following table.

[0061] Degradation rate, % Antibacterial rate, % Example 1 93 99.6 Example 2 96 60 Example 3 82 99.5

[0062] It can be seen from the table that the antibacterial properties of the product can be improved by adding antimicrobial agents, and the degradation rate of the product can be increased by adding photosensitizers.

[0063] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An antibacterial degradable plastic lunch box, characterized in that: The invention is composed of the following components in parts by mass: 45-60 parts of T30S polypropylene, 25-35 parts of 1080 polypropylene, 7-9 parts of ethylene copolymer, 11-13 parts of inorganic filler, 0.3-10 parts of antibacterial agent and 0.3-3 parts of white oil.

2. The antibacterial degradable plastic lunch box according to claim 1, characterized in that: In parts by mass, the T30S polypropylene comprises 50 parts, 1080 polypropylene comprises 30 parts, ethylene copolymer comprises 8 parts, inorganic filler comprises 12.5 parts, antibacterial agent comprises 3 parts, and white oil comprises 0.5 parts.

3. An antibacterial degradable plastic lunch box according to claim 1 or 2, characterized in that: The ethylene copolymer is one or more of ethylene-vinyl alcohol copolymer and ethylene-vinyl acetate copolymer.

4. The antibacterial degradable plastic lunch box according to claim 1 or 2, characterized in that: The antibacterial agent consists of antibacterial powder and a carrier and is obtained by modification with vinyl triethoxysilane.

5. The antibacterial degradable plastic lunch box according to claim 4, characterized in that: The antibacterial powder is one of nano silver powder, nano copper powder and nano zinc powder; the carrier is one of zeolite, calcium phosphate, zirconium phosphate, hydroxyapatite, bentonite, talc, soluble glass, silica gel, alumina and activated carbon.

6. The antibacterial degradable plastic lunch box according to claim 1, characterized in that: The antibacterial agent is extracted from plants containing antibacterial components, and the plants containing antibacterial components are truncatum, juniper, camellia oil, cotinus coggygria, rehmannia root, orange peel, phellodendron, barberry and turmeric.

7. The antibacterial degradable plastic lunch box according to claim 6, characterized in that: The method for extracting the antibacterial agent comprises: washing, drying and crushing plants containing effective antibacterial ingredients; ultrasonically extracting the crushed plants with ethanol at a solid-liquid ratio of 1:60 by mass at 25-75°C for 0.1-18h, cooling to room temperature, filtering, concentrating the filtrate, and freeze-drying to obtain a powdered antibacterial agent.

8. The antibacterial degradable plastic lunch box according to claim 1, characterized in that: The invention also includes a photosensitizer, which is one or more of cerium stearate, benzophenone or iron dialkyldithiocarbamate.

9. A method for preparing an antibacterial degradable plastic lunch box, characterized in that: The steps include: S1: preparing an antibacterial agent, wherein the antibacterial agent is extracted from a plant containing an antibacterial component; S2: 50 parts of polypropylene, 30 parts of 1080 polypropylene, 8 parts of ethylene copolymer, 12.5 parts of inorganic filler, 3 parts of antibacterial agent and 0.5 parts of white oil are mixed and stirred to obtain a mixture; S3: adding an antibacterial agent and a photosensitizer to the mixture in step S2, and then adding an appropriate amount of starch to make a smooth dough, applying silicone oil on the inner wall and screw of the extruder, extruding into strips by an extruder, cutting into pellets, and drying to obtain a plastic masterbatch; S4: Extruding the plastic masterbatch into plastic material by a screw machine, and then blow-molding the plastic material into a packaging box, wherein the screw temperature of the screw extruder is 120-240°C.

10. The method for preparing an antibacterial degradable plastic lunch box according to claim 9, characterized in that: The processing temperature of the screw extruder is: zone 1 temperature is 192°C, zone 2 temperature is 212°C, zone 3 temperature is 230°C, zone 4 temperature is 212°C, zone 5 temperature is 215°C, zone 6 temperature is 220°C, zone 7 temperature is 230°C, and the main engine speed is 300-400 rpm.