Green food packaging material based on epoxidized soybean oil and preparation method

Abstract

The invention is suitable for the technical field of food packaging, and provides a green food packaging material based on epoxidized soybean oil and a preparation method. The green food packaging material is prepared from the following components in parts by mass: 18.5 to 27.9 parts of epoxidized soybean oil, 3.3 to 5.4 parts of a metal phthalocyanine-PMMA (Polymethyl Methacrylate) compound, 2 to 3 parts of polylactic acid, 1.6 to 2.7 parts of soybean fiber, 0.4 to 1.1 parts of a plasticizer, 0.3 to 0.6 part of a heat stabilizer, 0.2 to 0.8 part of an antioxidant and 0.2 to 0.5 part of a nucleating agent, the preparation method comprises the following steps: step (1), preparing a metal phthalocyanine-PMMA compound: weighing metal phthalocyanine, reacting the metal phthalocyanine with methacryloyl chloride, and then reacting the metal phthalocyanine with MMA to prepare the metal phthalocyanine-PMMA compound; and (2) preparing the green food packaging material. The prepared food packaging material is green, environment-friendly and degradable, has an antibacterial function, is good in toughness and high in strength, and has a wide application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of food packaging, in particular to a green food packaging material based on epoxidized soybean oil and a preparation method thereof. Background Art

[0002] Epoxidized Soybean Oil (ESO) is a vegetable oil derivative obtained through epoxidation reaction. It is mainly made from soybean oil after epoxidation treatment. It has good environmental protection characteristics and a variety of application fields. Epoxidation treatment refers to adding oxygen to the unsaturated fatty acid molecules in soybean oil to form epoxy groups, which changes the molecular structure of soybean oil. Epoxidized soybean oil has excellent performance and has the following main characteristics:

[0003] ①. Environmental protection: Epoxidized soybean oil comes from natural plants and can reduce environmental burden during the production process, so it is considered to be one of the environmentally friendly plasticizers;

[0004] ②Good plasticizing effect: Since epoxy soybean oil has high polarity and excellent plasticizing effect, it is widely used in PVC plastics, rubber and coatings, etc., which can improve the flexibility and heat resistance of materials;

[0005] ③. Stability: Epoxidized soybean oil is stable under certain temperature and humidity, and has good aging resistance and low toxicity;

[0006] ④. Biodegradability: As a compound derived from vegetable oil, epoxidized soybean oil has certain biodegradability and is more environmentally friendly than traditional petroleum-based plasticizers.

[0007] Food packaging materials play an important role in ensuring food safety, extending food shelf life and improving food quality. With the increasing awareness of environmental protection and consumers' demand for healthy food, the research and development of food packaging materials are gradually moving towards environmental protection, biodegradability and non-toxicity.

[0008] Most of the existing food packaging materials on the market are still difficult to degrade, and the types of degradable food packaging materials are still relatively small. In view of this, the present invention proposes a green food packaging material based on epoxidized soybean oil and a preparation method thereof. Summary of the invention

[0009] The purpose of the present invention is to provide a green food packaging material based on epoxidized soybean oil and a preparation method thereof, so as to solve the problem that most of the food packaging materials on the market in the prior art are still difficult to degrade and the types of degradable food packaging materials are still relatively small.

[0010] To achieve the above object, the present invention provides the following technical solution: In a first aspect, the present invention provides a green food packaging material based on epoxidized soybean oil, wherein the green food packaging material comprises the following components and mass fractions:

[0011] 18.5-27.9 parts of epoxidized soybean oil, 3.3-5.4 parts of metal phthalocyanine-PMMA composite, 2-3 parts of polylactic acid, 1.6-2.7 parts of soybean fiber, 0.4-1.1 parts of plasticizer, 0.3-0.6 parts of heat stabilizer, 0.2-0.8 parts of antioxidant, and 0.2-0.5 parts of nucleating agent.

[0012] Preferably, the green food packaging material further comprises montmorillonite and calcium carbonate, wherein the mass proportions thereof are 0.15 to 0.35 parts of montmorillonite and 0.2 to 0.45 parts of calcium carbonate respectively.

[0013] Preferably, the metal phthalocyanine is one or more of tetraaminophthalocyanine cobalt, tetraaminophthalocyanine zinc, and tetraaminophthalocyanine copper, and its structural formula is as follows:

[0014]

[0015] Preferably, the plasticizer is one or more of stearic acid, soybean resin, and beeswax.

[0016] Preferably, the heat stabilizer is one or more of bentonite, sodium citrate, and polybutene-1.

[0017] Preferably, the antioxidant is one or more of alginate, grape seed extract, and olive oil.

[0018] Preferably, the nucleating agent is one or more of nano-silicon dioxide, aluminum hydroxide, and palmitic acid.

[0019] Preferably, the green food packaging material further comprises an antibacterial agent, and the mass fraction of the antibacterial agent is 0.18 to 0.32 parts.

[0020] Preferably, the antibacterial agent is one or more of tea polyphenols, lemon essential oil, and peppermint oil.

[0021] The second aspect of the present invention provides a method for preparing the green food packaging material according to the first aspect of the present invention, comprising the following steps:

[0022] Step (1), preparing a metal phthalocyanine-PMMA composite:

[0023] Weighing metal phthalocyanine, first reacting it with methacryloyl chloride, and then reacting it with MMA to prepare a metal phthalocyanine-PMMA composite;

[0024] Step (2), preparing green food packaging materials:

[0025] The metal phthalocyanine-PMMA complex, epoxy soybean oil and other components are sequentially added into a high-speed mixer in proportion, mixed evenly, and then sent into an extruder for melt blending, and finally extruded and formed, cooled and solidified to obtain a green food packaging material.

[0026] The present invention has at least the following beneficial effects:

[0027] The invention provides a green food packaging material based on epoxidized soybean oil and a preparation method thereof. The prepared food packaging material is green, environmentally friendly, degradable, has antibacterial function, good toughness, high strength, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The figure is a reaction route diagram of the metal phthalocyanine-PMMA complex in the present invention. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The present invention provides a green food packaging material based on epoxidized soybean oil, comprising the following components and weight fractions:

[0031] 18.5-27.9 parts of epoxidized soybean oil, 3.3-5.4 parts of metal phthalocyanine-PMMA composite, 2-3 parts of polylactic acid, 1.6-2.7 parts of soybean fiber, 0.4-1.1 parts of plasticizer, 0.3-0.6 parts of heat stabilizer, 0.2-0.8 parts of antioxidant, and 0.2-0.5 parts of nucleating agent.

[0032] Furthermore, the green food packaging material also includes montmorillonite and calcium carbonate, with the mass proportions of montmorillonite being 0.15 to 0.35 parts and calcium carbonate being 0.2 to 0.45 parts respectively.

[0033] Furthermore, the metal phthalocyanine is one or more of tetraaminophthalocyanine cobalt, tetraaminophthalocyanine zinc, and tetraaminophthalocyanine copper, and its structural formula is as follows:

[0034]

[0035] Furthermore, the plasticizer is one or more of stearic acid, soybean resin, and beeswax.

[0036] Furthermore, the heat stabilizer is one or more of bentonite, sodium citrate, and polybutene-1.

[0037] Furthermore, the antioxidant is one or more of alginate, grape seed extract, and olive oil.

[0038] Furthermore, the nucleating agent is one or more of nano-silicon dioxide, aluminum hydroxide, and palmitic acid.

[0039] Furthermore, the green food packaging material also includes an antibacterial agent, and the mass fraction of the antibacterial agent is 0.18 to 0.32 parts.

[0040] Furthermore, the antibacterial agent is one or more of tea polyphenols, lemon essential oil, and peppermint oil.

[0041] The preparation method of the above green food packaging material comprises the following steps:

[0042] Step (1), preparing a metal phthalocyanine-PMMA composite:

[0043] like Figure 1 As shown, metal phthalocyanine was weighed, mixed with methacryloyl chloride in a molar ratio of 1:4, and appropriate amounts of CH2Cl2 and triethylamine were added, reacted at room temperature for 8 hours, and after the reaction was completed, extracted with saturated sodium bicarbonate and dried to obtain the initial product;

[0044] The primary product was mixed with MMA in a molar ratio of 1:4, and appropriate amounts of N,N-dimethylformamide and AIBN were added, refluxed for 24 hours, filtered, extracted with ethanol, and dried to obtain a metal phthalocyanine-PMMA complex;

[0045] Step (2), preparing green food packaging materials:

[0046] The metal phthalocyanine-PMMA complex, epoxy soybean oil and other components are sequentially added into a high-speed mixer in proportion, mixed evenly, and then sent into an extruder for melt blending, and finally extruded and formed, cooled and solidified to obtain a green food packaging material.

[0047] Based on the above technical solution, the present invention provides the following partial embodiments:

[0048] Example 1

[0049] This embodiment provides a green food packaging material based on epoxidized soybean oil, including the following components and weight fractions:

[0050] 18.5 parts of epoxidized soybean oil, 3.3 parts of metal phthalocyanine-PMMA composite, 2 parts of polylactic acid, 1.6 parts of soybean fiber, 0.4 parts of plasticizer, 0.3 parts of heat stabilizer, 0.2 parts of antioxidant, and 0.2 parts of nucleating agent.

[0051] Among them, the metal phthalocyanine is tetraaminophthalocyanine copper, and its structural formula is as follows:

[0052]

[0053] Among them, the plasticizer is stearic acid; the heat stabilizer is bentonite; the antioxidant is alginate; and the nucleating agent is nano-silicon dioxide.

[0054] Example 2

[0055] This embodiment provides a green food packaging material based on epoxidized soybean oil, including the following components and weight fractions:

[0056] 23.5 parts of epoxidized soybean oil, 4 parts of metal phthalocyanine-PMMA composite, 2.6 parts of polylactic acid, 2.2 parts of soybean fiber, 0.9 parts of plasticizer, 0.5 parts of heat stabilizer, 0.4 parts of antioxidant, and 0.3 parts of nucleating agent.

[0057] Among them, the metal phthalocyanine is tetraaminophthalocyanine cobalt, and its structural formula is as follows:

[0058]

[0059] Among them, the plasticizer is soybean resin; the heat stabilizer is sodium citrate; the antioxidant is grape seed extract; and the nucleating agent is aluminum hydroxide.

[0060] Example 3

[0061] This embodiment provides a green food packaging material based on epoxidized soybean oil, including the following components and weight fractions:

[0062] 27.9 parts of epoxidized soybean oil, 5.4 parts of metal phthalocyanine-PMMA composite, 3 parts of polylactic acid, 2.7 parts of soybean fiber, 1.1 parts of plasticizer, 0.6 parts of heat stabilizer, 0.8 parts of antioxidant, and 0.5 parts of nucleating agent.

[0063] Among them, the metal phthalocyanine is zinc tetraaminophthalocyanine, and its structural formula is as follows:

[0064]

[0065] Among them, the plasticizer is beeswax; the heat stabilizer is polybutene-1; the antioxidant is olive oil; and the nucleating agent is palmitic acid.

[0066] Example 4

[0067] This embodiment provides a green food packaging material based on epoxidized soybean oil, which is the same as that of Embodiment 1 except that it further comprises montmorillonite and calcium carbonate, wherein the mass fractions thereof are 0.15 parts of montmorillonite and 0.2 parts of calcium carbonate respectively.

[0068] Example 5

[0069] This embodiment provides a green food packaging material based on epoxidized soybean oil, which is the same as that of Embodiment 2 except that it further comprises montmorillonite and calcium carbonate, wherein the mass fractions thereof are 0.25 parts of montmorillonite and 0.3 parts of calcium carbonate respectively.

[0070] Example 6

[0071] This embodiment provides a green food packaging material based on epoxidized soybean oil, which is the same as that of embodiment 3 except that it further comprises montmorillonite and calcium carbonate, with the mass fractions of montmorillonite being 0.35 parts and calcium carbonate being 0.45 parts respectively.

[0072] Example 7

[0073] This embodiment provides a green food packaging material based on epoxidized soybean oil, which is the same as that of Embodiment 1. The difference is that it also includes 0.18 parts by weight of an antibacterial agent, which is tea polyphenols.

[0074] Example 8

[0075] This embodiment provides a green food packaging material based on epoxidized soybean oil, which is the same as that of Embodiment 2 except that it further comprises 0.25 parts by weight of an antibacterial agent, which is lemon essential oil.

[0076] Example 9

[0077] This embodiment provides a green food packaging material based on epoxidized soybean oil, which is the same as that of Embodiment 3. The difference is that it also includes 0.32 parts by weight of an antibacterial agent, which is peppermint oil.

[0078] The food packaging materials prepared in the above Examples 1-9 are green, environmentally friendly, degradable, antibacterial, tough, and high in strength, and have broad application prospects. A series of performance tests were conducted on them, and the results are shown in the following table:

[0079]

[0080] The above shows and describes the basic principles, main features and advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0081] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A green food packaging material based on epoxidized soybean oil, characterized in that: The green food packaging material includes the following components and mass fractions: 18.5-27.9 parts of epoxidized soybean oil, 3.3-5.4 parts of metal phthalocyanine-PMMA composite, 2-3 parts of polylactic acid, 1.6-2.7 parts of soybean fiber, 0.4-1.1 parts of plasticizer, 0.3-0.6 parts of heat stabilizer, 0.2-0.8 parts of antioxidant, and 0.2-0.5 parts of nucleating agent.

2. The green food packaging material based on epoxidized soybean oil according to claim 1, characterized in that: The green food packaging material also includes montmorillonite and calcium carbonate, with the mass proportions of montmorillonite being 0.15 to 0.35 and calcium carbonate being 0.2 to 0.45 respectively.

3. The green food packaging material based on epoxidized soybean oil according to claim 1, characterized in that: The metal phthalocyanine is one or more of tetraaminophthalocyanine cobalt, tetraaminophthalocyanine zinc, and tetraaminophthalocyanine copper, and its structural formula is as follows:

4. The green food packaging material based on epoxidized soybean oil according to claim 1, characterized in that: The plasticizer is one or more of stearic acid, soybean resin and beeswax.

5. The green food packaging material based on epoxidized soybean oil according to claim 1, characterized in that: The heat stabilizer is one or more of bentonite, sodium citrate and polybutene-1.

6. The green food packaging material based on epoxidized soybean oil according to claim 1, characterized in that: The antioxidant is one or more of alginate, grape seed extract and olive oil.

7. The green food packaging material based on epoxidized soybean oil according to claim 1, characterized in that: The nucleating agent is one or more of nano silicon dioxide, aluminum hydroxide and palmitic acid.

8. The green food packaging material based on epoxidized soybean oil according to claim 1, characterized in that: The green food packaging material also includes an antibacterial agent, and the mass fraction of the antibacterial agent is 0.18 to 0.32 parts.

9. The green food packaging material based on epoxidized soybean oil according to claim 2, characterized in that: The antibacterial agent is one or more of tea polyphenols, lemon essential oil and peppermint oil.

10. A method for preparing the green food packaging material according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step (1), preparing a metal phthalocyanine-PMMA composite: Weighing metal phthalocyanine, first reacting it with methacryloyl chloride, and then reacting it with MMA to prepare a metal phthalocyanine-PMMA complex; Step (2), preparing green food packaging materials: The metal phthalocyanine-PMMA complex, epoxy soybean oil and other components are sequentially added into a high-speed mixer in proportion, mixed evenly, and then sent into an extruder for melt blending, and finally extruded and formed, cooled and solidified to obtain a green food packaging material.

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