Antibacterial and degradable food packaging material and preparation method thereof

Abstract

The present invention discloses an antibacterial and degradable food packaging material. The materials include, by weight, resin, plant fiber, filler, compatibilizer, and dispersant. The prepared antibacterial and degradable packaging material not only has biodegradability and natural antibacterial ability, but also has puncture resistance. The prepared food packaging material is safe, non-toxic, and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the C08L1 / 02 field, and in particular to an antibacterial and degradable food packaging material and a preparation method thereof. Background Art

[0002] With the development of society, due to the convenience of plastic, we began to use a lot of plastic, which caused serious environmental pollution. The degradability of plastic has also become a research topic. In the application of food packaging materials, there are already many biodegradable plastic products.

[0003] Chinese patent CN201611075267 discloses an antibacterial and degradable food packaging material and its preparation, which uses essential oils, starch, polyhydroxybutyrate, polymethyl ethylene carbonate, and polyvinyl alcohol as raw materials for the packaging and preservation material, but the packaging material has poor puncture resistance.

[0004] Chinese patent CN201710205800 discloses an antibacterial and degradable food packaging material and its preparation, which uses nano-titanium dioxide, polycaprolactone, polybutylene succinate, polyvinyl alcohol, polyhydroxyalkanoate, polylactic acid, and polymethyl ethylene carbonate as raw materials for the packaging and preservation material, but the antibacterial effect is not obvious.

[0005] Chinese patent CN201510516064 discloses an antibacterial and degradable packaging material and a preparation method thereof, which has a low film-forming temperature but poor food preservation ability. Summary of the Invention

[0006] In order to solve the above problems, the present invention discloses an antibacterial and degradable food packaging material, which comprises, by weight, 60-80 parts of resin, 10-20 parts of plant fiber, 2-8 parts of filler, 1-3 parts of compatibilizer, and 1-5 parts of dispersant.

[0007] Preferably, in parts by weight, the material includes 73 parts of resin, 16 parts of plant fiber, 7 parts of filler, 2.5 parts of compatibilizer, and 1.5 parts of dispersant.

[0008] Preferably, the resin is selected from one or both of thermosetting resin and thermoplastic resin.

[0009] More preferably, the thermoplastic resin is selected from polycarbonate and biodegradable resin, and the weight ratio thereof is 5:(1-10).

[0010] More preferably, the weight ratio is 1:1.

[0011] Preferably, the biodegradable resin is selected from one or more of polylactic acid, polycaprolactone, polyhydroxyalkanoate, and polybutylene adipate-succinate.

[0012] Further preferably, the biodegradable resin is selected from polylactic acid and polycaprolactone, and the weight ratio thereof is 2:(1-5).

[0013] More preferably, the weight ratio is 2:3.

[0014] The applicant has discovered that when the biodegradable resin is polylactic acid, the packaging material will become heat-inresistant during the production process, resulting in film blowing failure, and the addition of plant fibers will cause the plant fibers to float to the surface of the packaging material. However, when polycaprolactone is selected for compounding, the problem of plant fiber exposure can be solved due to the good compatibility of polycaprolactone with polymer materials. In addition, since the plant fibers are evenly dispersed in the resin, they are interwoven inside the packaging material to form a layered structure of plant fibers, which unexpectedly makes the material puncture-resistant.

[0015] Preferably, the plant fiber is selected from one or more of kapok fiber, bamboo fiber, tea fiber, and mugwort fiber.

[0016] Further preferably, the plant fibers are selected from bamboo fiber, mugwort fiber, and kapok fiber, and the weight ratio thereof is 1:3:(1-5).

[0017] More preferably, the weight ratio is 1:3:1.

[0018] The applicant has found that existing packaging materials often use chemical antibacterial agents to make the packaging materials antibacterial. However, the antibacterial agents will precipitate under high temperature or other improper storage conditions, thereby endangering human health. However, the use of natural antibacterial fibers can solve this problem. In the preparation process, since bamboo fiber is a long fiber, the internal friction between the inside and the resin is large, which increases the flexibility of the resin. In addition, bamboo fiber and mugwort fiber are mixed and interwoven inside the resin to form a long and short fiber network, which makes the material have strong puncture resistance and can hold some hard and sharp foods.

[0019] Preferably, the filler is selected from one or more of silicon dioxide, volcanic rock, sepiolite and starch.

[0020] Further preferably, the filler is selected from silica and volcanic rock in a weight ratio of 5:(1-6).

[0021] More preferably, the weight ratio is 5:3.

[0022] Preferably, the average particle size of the volcanic rock is 10-50 nm.

[0023] Further preferably, the average particle size of the volcanic rock is 15 nm.

[0024] The applicant has discovered that when volcanic rock is used as an inorganic filler, its porosity and small particle size can lead to poor compatibility with the resin during mixing due to particle agglomeration. However, as the particles become larger, their increased hardness reduces the toughness of the packaging material. However, controlling the average particle size of the volcanic rock to between 10 and 50 nm not only improves compatibility but also maintains the packaging material's flexibility.

[0025] Preferably, the compatibilizer is selected from one or more of a maleic acid-type compatibilizer, an acrylic acid-modified resin compatibilizer, and an epoxy resin-modified polymer compatibilizer.

[0026] More preferably, the compatibilizer is maleic anhydride grafted PE among maleic acid type compatibilizers.

[0027] More preferably, the maleic anhydride grafted PE brand M603 is purchased from Ziyi Plastic Business Department, Zhangmutou, Dongguan City.

[0028] Preferably, the dispersant is selected from one or more of paraffin waxes, metal soaps, and low molecular weight waxes.

[0029] Further preferably, the dispersant is selected from paraffin wax and purchased from Henan Rongshen Chemical Co., Ltd.

[0030] Preferably, the polycarbonate brand is PC141R-111, purchased from Xunhua New Material Technology Co., Ltd.

[0031] Preferably, the polylactic acid brand is 4032D, purchased from Yihuan Plastic Chemical Co., Ltd.

[0032] Preferably, the polycaprolactone brand: CAS number is 24980-41-4, brand 6800, purchased from Xinwangda Plastic Technology Co., Ltd.

[0033] Preferably, the bamboo fiber is purchased from Yujiajia Plastic Raw Materials Co., Ltd.

[0034] Preferably, the kapok fiber brand: MM015, purchased from Qianbaidu Decoration Materials Co., Ltd.

[0035] Preferably, the mugwort fiber brand is BetterTex, purchased from Bonte Ecological Textile Technology Co., Ltd.

[0036] Preferably, the silicon dioxide brand HS-19 is purchased from Hengshuo Nanomaterials Co., Ltd.

[0037] Preferably, the volcanic rock grade HSYF01 is purchased from Allen Mineral Products Co., Ltd.

[0038] The present invention also discloses a method for preparing an antibacterial and degradable food packaging material, comprising the following steps:

[0039] S1: Put the raw materials into the blender and mix them evenly;

[0040] S2: Use a twin-screw extruder, with the temperature of zone 1 at 110-120°C, zone 2 at 120-140°C, zone 3 at 130-150°C, and zone 4 at 160-180°C.

[0041] S3: Using a film blowing machine to blow film to prepare a packaging bag.

[0042] In one embodiment, the raw materials in step S1 are placed in a blender and stirred at a speed of 1000-1200 rpm for 30-60 minutes.

[0043] Preferably, the raw materials in step S1 are placed in a blender and stirred at a speed of 1100 rpm for 45 minutes.

[0044] In one embodiment, the step S2 uses a twin-screw extruder with a temperature of 113°C in zone 1, 135°C in zone 2, 141°C in zone 3, and 175°C in zone 4.

[0045] Beneficial effects:

[0046] The present invention not only enables the packaging material to have an antibacterial effect but also increases the puncture resistance of the packaging material by adding plant fibers.

[0047] By controlling the weight ratio of silicon dioxide to volcanic rock, the present invention can make the packaging material have good hygroscopicity, absorb moisture in the packaging air into the interior of the packaging material, and ensure a dry environment inside the packaging.

[0048] The present invention can make the packaging material have excellent degradation effect by compounding with biodegradable resin.

[0049] The packaging material prepared by the invention has good decorative performance and good adhesion to the decorative layer.

[0050] The packaging material prepared by the invention is environmentally friendly and pollution-free, and complies with national food safety standards. Specific embodiments

[0051] Example 1

[0052] This embodiment 1 discloses an antibacterial and degradable food packaging material, which includes: 60 parts of resin, 10 parts of plant fiber, 2 parts of filler, 1 part of compatibilizer, and 1 part of dispersant.

[0053] The resin is selected from thermoplastic resin polycarbonate and biodegradable resin, and the weight ratio thereof is 5:1.

[0054] The biodegradable resin is selected from polylactic acid and polycaprolactone in a weight ratio of 2:1.

[0055] The plant fibers are selected from bamboo fiber, mugwort fiber and kapok fiber, and the weight ratio thereof is 1:3:1.

[0056] The filler is selected from silica and volcanic rock in a weight ratio of 5:1.

[0057] The compatibilizer is maleic anhydride grafted PE in the maleic acid type compatibilizer.

[0058] The maleic anhydride grafted PE brand M603 was purchased from Ziyi Plastics Business Department in Zhangmutou, Dongguan City.

[0059] The dispersant is selected from paraffin wax and purchased from Henan Rongshen Chemical Co., Ltd.

[0060] The polycarbonate grade: PC141R-111, purchased from Xunhua New Material Technology Co., Ltd.

[0061] The polylactic acid brand: 4032D, purchased from Yihuan Plastic Chemical Co., Ltd.

[0062] The polycaprolactone brand: CAS number 24980-41-4, brand 6800, purchased from Xinwangda Plastic Technology Co., Ltd.

[0063] The bamboo fiber was purchased from Yujiajia Plastic Raw Materials Co., Ltd.

[0064] The kapok fiber brand: MM015, purchased from Qianbaidu Decoration Materials Co., Ltd.

[0065] The wormwood fiber brand: BetterTex, purchased from Bangte Ecological Textile Technology Co., Ltd.

[0066] The silicon dioxide brand HS-19 was purchased from Hengshuo Nanomaterials Co., Ltd.

[0067] The volcanic rock grade HSYF01 was purchased from Allen Mineral Products Co., Ltd.

[0068] This embodiment 1 also discloses a method for preparing an antibacterial and degradable food packaging material, comprising the following steps:

[0069] S1: Put the raw materials into a blender and mix well.

[0070] S2: Use a twin-screw extruder, with the temperature of zone 1 at 110°C, zone 2 at 120°C, zone 3 at 130°C, and zone 4 at 160°C.

[0071] S3: Using a film blowing machine to blow film to prepare a packaging bag.

[0072] In step S1, the raw materials are placed in a blender at a speed of 1000 rpm and stirred for 30 minutes.

[0073] Example 2

[0074] Example 2 of the present invention discloses an antibacterial and degradable food packaging material, which includes: 80 parts of resin, 20 parts of plant fiber, 8 parts of filler, 3 parts of compatibilizer, and 5 parts of dispersant.

[0075] The resin is selected from polycarbonate and biodegradable resin, and the weight ratio thereof is 5:10.

[0076] The biodegradable resin is selected from polylactic acid and polycaprolactone in a weight ratio of 2:1.

[0077] The plant fibers are selected from bamboo fiber, mugwort fiber and kapok fiber, and the weight ratio thereof is 1:3:5.

[0078] The filler is selected from silica and volcanic rock in a weight ratio of 5:6.

[0079] The compatibilizer is maleic anhydride grafted PE in the maleic acid type compatibilizer.

[0080] The maleic anhydride grafted PE brand M603 was purchased from Ziyi Plastics Business Department in Zhangmutou, Dongguan City.

[0081] The dispersant is selected from paraffin wax and purchased from Henan Rongshen Chemical Co., Ltd.

[0082] The polycarbonate grade: PC141R-111, purchased from Xunhua New Material Technology Co., Ltd.

[0083] The polylactic acid brand: 4032D, purchased from Yihuan Plastic Chemical Co., Ltd.

[0084] The polycaprolactone brand: CAS number 24980-41-4, brand 6800, purchased from Xinwangda Plastic Technology Co., Ltd.

[0085] The bamboo fiber was purchased from Yujiajia Plastic Raw Materials Co., Ltd.

[0086] The kapok fiber brand: MM015, purchased from Qianbaidu Decoration Materials Co., Ltd.

[0087] The wormwood fiber brand: BetterTex, purchased from Bangte Ecological Textile Technology Co., Ltd.

[0088] The silicon dioxide brand HS-19 was purchased from Hengshuo Nanomaterials Co., Ltd.

[0089] The volcanic rock grade HSYF01 was purchased from Allen Mineral Products Co., Ltd.

[0090] This embodiment 2 also discloses a method for preparing an antibacterial and degradable food packaging material, comprising the following steps:

[0091] S1: Put the raw materials into the blender and mix them evenly;

[0092] S2: Use a twin-screw extruder, with the temperature of zone 1 at 120°C, zone 2 at 140°C, zone 3 at 150°C, and zone 4 at 180°C.

[0093] S3: Using a film blowing machine to blow film to prepare a packaging bag.

[0094] In step S1, the raw materials are placed in a blender and stirred at a speed of 1200 rpm for 60 minutes.

[0095] Example 3

[0096] Example 3 of the present invention discloses an antibacterial and degradable food packaging material. The material comprises, by weight, 73 parts of resin, 16 parts of plant fiber, 7 parts of filler, 2.5 parts of compatibilizer, and 1.5 parts of dispersant.

[0097] The resin is selected from thermoplastic resin polycarbonate and biodegradable resin, with a weight ratio of 1:1.

[0098] The biodegradable resin is selected from polylactic acid and polycaprolactone in a weight ratio of 2:3.

[0099] The plant fibers are selected from bamboo fiber, mugwort fiber and kapok fiber, and the weight ratio thereof is 1:3:1.

[0100] The filler is selected from silica and volcanic rock in a weight ratio of 5:3.

[0101] The maleic anhydride grafted PE brand M603 was purchased from Ziyi Plastics Business Department in Zhangmutou, Dongguan City.

[0102] The dispersant is selected from paraffin wax and purchased from Henan Rongshen Chemical Co., Ltd.

[0103] The polycarbonate grade: PC141R-111, purchased from Xunhua New Material Technology Co., Ltd.

[0104] The polylactic acid brand: 4032D, purchased from Yihuan Plastic Chemical Co., Ltd.

[0105] The polycaprolactone brand: CAS number 24980-41-4, brand 6800, purchased from Xinwangda Plastic Technology Co., Ltd.

[0106] The bamboo fiber was purchased from Yujiajia Plastic Raw Materials Co., Ltd.

[0107] The kapok fiber brand: MM015, purchased from Qianbaidu Decoration Materials Co., Ltd.

[0108] The wormwood fiber brand: BetterTex, purchased from Bangte Ecological Textile Technology Co., Ltd.

[0109] The silicon dioxide brand HS-19 was purchased from Hengshuo Nanomaterials Co., Ltd.

[0110] The volcanic rock grade HSYF01 was purchased from Allen Mineral Products Co., Ltd.

[0111] This embodiment 3 also discloses a method for preparing an antibacterial and degradable food packaging material, comprising the following steps:

[0112] S1: Place the raw materials into a blender at 1100 rpm and stir for 45 minutes.

[0113] S2: Twin-screw extruder was used, with the temperature of zone 1 at 113°C, zone 2 at 135°C, zone 3 at 141°C, and zone 4 at 175°C.

[0114] S3: Using a film blowing machine to blow film to prepare a packaging bag.

[0115] Comparative Example 1

[0116] The weight ratio of the polylactic acid to the polycaprolactone is 1:7. The rest is the same as in Example 3.

[0117] Comparative Example 2

[0118] The inorganic filler is sepiolite and silicon dioxide, and the weight ratio thereof is 3:5. The rest is the same as in Example 3.

[0119] Performance testing:

[0120] 1. Antibacterial ability test: Test in accordance with FZ / T 73023-2006 and record the results in Table 1.

[0121] 2. Flexibility test: According to GB / T1731-93 "Determination of paint film flexibility", the results are recorded in Table 1.

[0122] 3. Puncture resistance test: Refer to GB / T37841-2019 "Test method for puncture resistance of plastic film and sheeting" and record the results in Table 1.

[0123] Table 1

[0124]

Claims

1. An antibacterial and degradable food packaging material, characterized in that: The material comprises, by weight, 70-80 parts of resin, 10-20 parts of plant fiber, 2-8 parts of filler, 1-3 parts of compatibilizer, and 1-5 parts of dispersant; The resin is selected from thermoplastic resin polycarbonate and biodegradable resin, and the weight ratio thereof is 5:(1-10); The biodegradable resin is selected from polylactic acid and polycaprolactone in a weight ratio of 2:(1-5); The plant fibers are selected from bamboo fibers, wormwood fibers, and kapok fibers, and the weight ratio thereof is 1:3:(1-5); The filler is selected from silicon dioxide and volcanic rock in a weight ratio of 5:(1-6); the average particle size of the volcanic rock is 10-50 nm.

2. The material according to claim 1, characterized in that The compatibilizer is selected from one or more of a maleic acid compatibilizer, an acrylic acid modified resin compatibilizer, and an epoxy resin modified polymer compatibilizer.

3. The material according to claim 1, characterized in that The dispersant is selected from one or more of paraffin waxes, metal soaps, and low molecular weight waxes.

4. A method for preparing the material according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1: Put the raw materials into the blender and mix them evenly; S2: Use a twin-screw extruder, with the temperature of zone 1 at 110-120°C, zone 2 at 120-140°C, zone 3 at 130-150°C, and zone 4 at 160-180°C; S3: Using a film blowing machine to blow film to prepare a packaging bag.

5. The preparation method according to claim 4, characterized in that: In step S1, the raw materials are placed in a blender and stirred at a speed of 100-1200 rpm for 30-60 minutes.

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