Stretch-resistant food-grade packaging film and production process thereof
By using specific proportioning and bidirectional stretching processes of materials such as PBAT, cellulose acetate, epoxy soybean oil acrylate in food-grade packaging films, the problem of insufficient tensile resistance of traditional plastic packaging materials is solved, and a kind of The food-grade packaging film has good tensile resistance and environmentally friendly, achieving improvements in mechanical strength and biodegradability.
Patent Information
- Application Number
- CN202411219458.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2024-12-13
AI Technical Summary
Traditional plastic packaging materials have shortcomings in tensile resistance, resulting in limited application in the field of high-deficiency packaging. At the same time, their non-degradability and potential environmental pollution problems are becoming increasingly prominent. It is necessary to develop a kind of tensile resistance and environmental protection. Friendly food grade packaging film.
Using specific ratios of PBAT, cellulose acetate, epoxy soybean oil acrylate, sodium cocoaminopropionate, polyacrylic acid intercalated hydrotalcite, antibacterial agent, antioxidant and UV stabilizer, melted through a twin-screw extruder Extrusion, cooling molding and bidirectional stretching processes prepare tensile-resistant food-grade packaging films to enhance their mechanical strength and biodegradability.
The prepared food-grade packaging films have excellent performance in tensile resistance, biodegradability and environmental friendliness, extending the shelf life of food, reducing production energy consumption, and improving production efficiency.
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Abstract
Description
Technical Field
[0001] The present application relates to the technical field of packaging films, and in particular to a stretch-resistant food-grade packaging film and a production process thereof. Background Art
[0002] With the rapid development of the global food industry, efficient and safe packaging film materials have become a key factor in ensuring the freshness and quality of food. Traditional food packaging film materials, such as polyethylene (PE) and polypropylene (PP), have long been widely used in the field of food packaging films due to their low production costs and excellent isolation properties. These materials can effectively isolate air, moisture and light, thereby extending the shelf life of food and protecting food from contamination or physical damage by external microorganisms. However, the non-degradability and potential environmental pollution problems of traditional plastic packaging materials have become increasingly prominent. The widespread use of materials such as polyethylene (PE) and polypropylene (PP) has not only exacerbated the "white pollution" on the earth, but also caused plastic pollution in the ocean. In addition, some traditional plastics may release harmful substances such as plasticizers during processing or use, posing a potential threat to consumer health.
[0003] In order to meet the above challenges, researchers have gradually turned to exploring more environmentally friendly packaging film materials. Among them, bio-based materials, such as polylactic acid (PLA) and polybutylene adipate / terephthalate (PBAT), stand out as environmentally friendly materials. PLA is derived from renewable resources such as corn starch and sugars. It is not only biodegradable under natural conditions, which greatly reduces the environmental burden, but also has high transparency and good aesthetics, making it suitable for food packaging with high requirements for display effects. However, the physical properties of PLA have great limitations, especially heat resistance and toughness, which greatly limit its application in different scenarios.
[0004] In contrast, PBAT provides a tougher and more durable option for the packaging industry with its good processing properties, high elasticity and toughness. However, PBAT still faces challenges in terms of tensile resistance, which limits its application in certain demanding packaging fields.
[0005] Therefore, there is an urgent need to develop an environmentally friendly food-grade packaging film with good tensile strength. Summary of the invention
[0006] In order to solve at least one of the above technical problems and develop an environmentally friendly food-grade packaging film with good tensile properties, the present application provides a tensile-resistant food-grade packaging film and a production process thereof.
[0007] On the one hand, the present application provides a stretch-resistant food-grade packaging film, whose raw material composition includes, by weight: 50 to 70 parts of PBAT, 10 to 20 parts of cellulose acetate, 5 to 20 parts of epoxy soybean oil acrylate, 1 to 5 parts of sodium cocoyl aminopropionate, 3 to 13 parts of polyacrylic acid intercalated hydrotalcite, 1 to 3 parts of antibacterial agent, 0.5 to 2 parts of antioxidant, and 0.5 to 2 parts of ultraviolet stabilizer.
[0008] By adopting the above technical scheme, the present application adopts specific raw materials and proportions to produce a food-grade packaging film with good tensile strength and environmental friendliness. The present application adopts PBAT as the main substrate, which has good biodegradability, good toughness and processing performance, and provides basic mechanical strength and processing convenience for the packaging film; cellulose acetate is a modified natural polymer that helps to improve the mechanical properties and gas barrier properties of the packaging film, thereby extending the shelf life of food; the addition of epoxy soybean oil acrylate increases the toughness of the packaging film, introduces epoxy groups, and can also improve the compatibility of the raw materials, thereby improving the mechanical properties of the packaging film; sodium cocoyl aminopropionate can improve the dispersibility and compatibility between different components, and its own biological source properties increase the overall environmental friendliness. The present application also adds polyacrylic acid intercalated hydrotalcite, whose interlayer structure can enhance the tensile strength of the packaging film and help to block gas and moisture.
[0009] Optionally, the raw material composition includes, by weight: 55-65 parts of PBAT, 12-18 parts of cellulose acetate, 10-15 parts of epoxy soybean oil acrylate, 2-4 parts of sodium cocoyl aminopropionate, 6.5-10 parts of polyacrylic acid intercalated hydrotalcite, 1.5-2.5 parts of antibacterial agent, 1-1.5 parts of antioxidant, and 1-1.5 parts of ultraviolet stabilizer.
[0010] Optionally, the raw material composition includes, by weight: 60 parts of PBAT, 15 parts of cellulose acetate, 12 parts of epoxy soybean oil acrylate, 3 parts of sodium cocoyl aminopropionate, 8 parts of polyacrylic acid intercalated hydrotalcite, 2 parts of antibacterial agent, 1.2 parts of antioxidant, and 1.2 parts of ultraviolet stabilizer.
[0011] Optionally, the weight ratio of the epoxy soybean oil acrylate to the polyacrylic acid intercalated hydrotalcite is 1 to 2:1.
[0012] By adopting the above technical solution, the epoxy soybean oil acrylate and polyacrylic acid intercalated hydrotalcite are mixed in a specific proportion in the present application, which can balance the flexibility and mechanical strength of the packaging film, and at the same time enhance the flexibility, also improve the tensile strength of the packaging film.
[0013] Optionally, the preparation method of the polyacrylic acid intercalated hydrotalcite is: Step 1: Mix Mg(NO3)2·6H2O and Al(NO3)3·9H2O, add water to dissolve, and prepare a mixed salt solution; Mg 2+ and Al 3+ The molar ratio is 2 to 3:1; Step 2: adding a sodium hydroxide solution dropwise to the mixed salt solution, stirring to generate a precipitate, separating, washing, and drying to obtain a basic hydrotalcite; Step 3: ultrasonically dispersing the basic hydrotalcite in water to obtain a hydrotalcite suspension; Step 4: adding polyacrylic acid to the hydrotalcite suspension, adding potassium persulfate, stirring, separating, washing, and drying to obtain polyacrylic acid intercalated hydrotalcite.
[0014] Optionally, the antibacterial agent is selected from at least one of chitosan, ε-polylysine, artemisia annua extract and curcumin.
[0015] By adopting the above technical solution, the present application adopts natural antibacterial agents, which are highly safe and environmentally friendly.
[0016] Optionally, the antioxidant is selected from at least one of butylated hydroxyanisole, dibutyl hydroxytoluene and propyl gallate.
[0017] By adopting the above technical scheme, the antioxidant of the present application shows high efficiency in preventing aging of food-grade packaging film materials and protecting packaging contents from oxidation, ensuring the stability and life of the packaging material itself without causing adverse effects on food.
[0018] Optionally, the UV stabilizer is selected from at least one of UV absorber UV-531 and UV absorber UV-329.
[0019] By adopting the above technical solution, the addition of UV stabilizer in the present application can reduce the aging of the packaging film caused by ultraviolet rays, thereby extending the service life of the packaging film and protecting food from indirect damage by ultraviolet rays, thereby maintaining the freshness and nutritional content of the food.
[0020] In a second aspect, the present application provides a production process for the above-mentioned stretch-resistant food-grade packaging film, comprising the following steps: S1, mixing the PBAT, cellulose acetate, epoxy soybean oil acrylate, sodium cocoyl aminopropionate, polyacrylic acid intercalated hydrotalcite, antibacterial agent, antioxidant and ultraviolet stabilizer to prepare a mixture; S2, feeding the mixed material into a twin-screw extruder, melting and extruding, cooling and forming, biaxially stretching, and heat-setting to obtain a stretch-resistant food-grade packaging film.
[0021] By adopting the above technical solution, the production process adopted in this application has a simple process, is easy to operate, improves production efficiency, reduces energy consumption and is environmentally friendly. In step S2, biaxial stretching can form a highly oriented structure and enhance the tensile strength of the packaging film material. Heat setting can fix the orientation of the molecular chain, further improve dimensional stability, and prevent shrinkage or deformation caused by stress release during use.
[0022] Optionally, in step S2, the extrusion temperature is 180-230°C; the heat setting temperature is 100-150°C.
[0023] Optionally, in step S2, the biaxial stretching includes longitudinal stretching and transverse stretching, the stretching ratio of the longitudinal stretching (i.e. the ratio of the length after stretching to the original length) is 2-3, and the stretching ratio of the transverse stretching is 2-4.
[0024] In summary, the present invention includes at least one of the following beneficial technical effects: 1. This application adopts specific raw materials and proportions to produce a food-grade packaging film with good tensile strength and environmental friendliness.
[0025] 2. The present application also adds polyacrylic acid intercalated hydrotalcite, whose interlayer structure can enhance the tensile strength of the packaging film.
[0026] 3. The production process adopted in this application has a simple process, is easy to operate, improves production efficiency, reduces energy consumption and is environmentally friendly. DETAILED DESCRIPTION
[0027] The present application is further described in detail below with reference to the embodiments.
[0028] The present application designs a stretch-resistant food-grade packaging film, and its raw material composition includes, by weight: 50-70 parts of PBAT, 10-20 parts of cellulose acetate, 5-20 parts of epoxy soybean oil acrylate, 1-5 parts of sodium cocoyl aminopropionate, 3-13 parts of polyacrylic acid intercalated hydrotalcite, 1-3 parts of antibacterial agent, 0.5-2 parts of antioxidant, and 0.5-2 parts of ultraviolet stabilizer.
[0029] The stretch-resistant food-grade packaging film of the present application is prepared by the following method, comprising the following steps: S1, mixing the PBAT, cellulose acetate, epoxy soybean oil acrylate, sodium cocoyl aminopropionate, polyacrylic acid intercalated hydrotalcite, antibacterial agent, antioxidant and ultraviolet stabilizer to prepare a mixture; S2, feeding the mixed material into a twin-screw extruder, melting and extruding, cooling and forming, biaxially stretching, and heat-setting to obtain a stretch-resistant food-grade packaging film.
[0030] The applicant has designed the technical solution of the present application in view of the problem that existing food-grade packaging films still have limitations in terms of tensile strength.
[0031] Firstly, the present invention proposes a stretch-resistant food-grade packaging film, the components of which include: PBAT, cellulose acetate, epoxy soybean oil acrylate, sodium cocoyl aminopropionate, polyacrylic acid intercalated hydrotalcite, antibacterial agent, antioxidant and ultraviolet stabilizer. The prepared stretch-resistant food-grade packaging film has good stretch resistance and is environmentally friendly.
[0032] Secondly, the production process of the stretch-resistant food-grade packaging film adopted in the present application has a simple process, is easy to operate, improves production efficiency, reduces energy consumption and is environmentally friendly.
[0033] The raw materials used in this application are as follows: PBAT:CAS:55231-08-8.
[0034] Cellulose acetate: CAS: 9004-35-7.
[0035] Epoxidized soybean oil acrylate: Huainan Kedi Chemical Technology Co., Ltd.
[0036] Sodium Cocoyl Alanine: CAS: 68608-68-4.
[0037] Mg(NO3)2·6H2O (magnesium nitrate hexahydrate): CAS: 13446-18-9.
[0038] Al(NO3)3·9H2O (aluminum nitrate nonahydrate): CAS: 7784-27-2.
[0039] Polyacrylic acid: CAS: 9003-01-4.
[0040] Potassium persulfate: CAS: 7727-21-1.
[0041] ε-Polylysine: CAS: 28211-04-3.
[0042] Artemisia argyi extract: Fufeng Snot Biotechnology Co., Ltd., specification: 10:1.
[0043] Butylated hydroxyanisole: CAS: 25013-16-5.
[0044] Butylated hydroxytoluene: CAS: 128-37-0.
[0045] Ultraviolet absorber UV-531: CAS: 1843-05-6.
[0046] Ultraviolet absorber UV-329: CAS: 3147-75-9. Specific embodiments
[0047] The preparation method of the polyacrylic acid intercalated hydrotalcite used in Examples 1 to 5 is: Step 1: Mix Mg(NO3)2·6H2O and Al(NO3)3·9H2O, add water to dissolve, and prepare a mixed salt solution; Mg 2+ and Al 3+ The molar ratio is 3:1; Step 2: adding a sodium hydroxide solution with a mass fraction of 5% dropwise into the mixed salt solution, stirring to generate a precipitate, separating, washing, and drying to obtain a basic hydrotalcite; Step 3: ultrasonically dispersing the basic hydrotalcite in water to obtain a hydrotalcite suspension; Step 4: adding polyacrylic acid to the hydrotalcite suspension, adding potassium persulfate, stirring at 70° C. for 7 hours, separating, washing, and drying to obtain polyacrylic acid intercalated hydrotalcite.
[0048] Examples 1 to 5 Example 1 The present embodiment provides a stretch-resistant food-grade packaging film, and its raw material composition includes, by weight: 70 parts of PBAT, 20 parts of cellulose acetate, 5 parts of epoxy soybean oil acrylate, 1 part of sodium cocoyl aminopropionate, 3 parts of polyacrylic acid intercalated hydrotalcite, 3 parts of antibacterial agent, 2 parts of antioxidant, and 0.5 parts of ultraviolet stabilizer; The antibacterial agent is Artemisia argyi extract; the antioxidant is butylated hydroxyanisole; the ultraviolet stabilizer is ultraviolet absorber UV-531; The production process includes the following steps: S1, mixing PBAT, cellulose acetate, epoxy soybean oil acrylate, sodium cocoyl aminopropionate, polyacrylic acid intercalated hydrotalcite, antibacterial agent, antioxidant and ultraviolet stabilizer to prepare a mixture; S2. The mixed material is fed into a twin-screw extruder for melt extrusion, cooling and molding, biaxial stretching, and heat setting to obtain a stretch-resistant food-grade packaging film; wherein the extrusion temperature is 200°C; the biaxial stretching includes longitudinal stretching and transverse stretching, the longitudinal stretching ratio is 2, and the transverse stretching ratio is 4; the heat setting temperature is 125°C.
[0049] Example 2 The present embodiment provides a stretch-resistant food-grade packaging film, and its raw material composition includes, by weight: 55 parts of PBAT, 18 parts of cellulose acetate, 15 parts of epoxy soybean oil acrylate, 2 parts of sodium cocoyl aminopropionate, 10 parts of polyacrylic acid intercalated hydrotalcite, 1.5 parts of antibacterial agent, 1 part of antioxidant, and 1 part of ultraviolet stabilizer; The antibacterial agent is Artemisia argyi extract; the antioxidant is butylated hydroxyanisole; the ultraviolet stabilizer is ultraviolet absorber UV-531; The production process includes the following steps: S1, mixing PBAT, cellulose acetate, epoxy soybean oil acrylate, sodium cocoyl aminopropionate, polyacrylic acid intercalated hydrotalcite, antibacterial agent, antioxidant and ultraviolet stabilizer to prepare a mixture; S2. The mixed material is fed into a twin-screw extruder for melt extrusion, cooling and molding, biaxial stretching, and heat setting to obtain a stretch-resistant food-grade packaging film; wherein the extrusion temperature is 200°C; the biaxial stretching includes longitudinal stretching and transverse stretching, the longitudinal stretching ratio is 2, and the transverse stretching ratio is 4; the heat setting temperature is 125°C.
[0050] Example 3 The present embodiment provides a stretch-resistant food-grade packaging film, and its raw material composition includes, by weight: 60 parts of PBAT, 15 parts of cellulose acetate, 12 parts of epoxy soybean oil acrylate, 3 parts of sodium cocoyl aminopropionate, 8 parts of polyacrylic acid intercalated hydrotalcite, 2 parts of antibacterial agent, 1.2 parts of antioxidant, and 1.2 parts of ultraviolet stabilizer; The antibacterial agent is Artemisia argyi extract; the antioxidant is butylated hydroxyanisole; the ultraviolet stabilizer is ultraviolet absorber UV-531; The production process includes the following steps: S1, mixing PBAT, cellulose acetate, epoxy soybean oil acrylate, sodium cocoyl aminopropionate, polyacrylic acid intercalated hydrotalcite, antibacterial agent, antioxidant and ultraviolet stabilizer to prepare a mixture; S2. The mixed material is fed into a twin-screw extruder for melt extrusion, cooling and molding, biaxial stretching, and heat setting to obtain a stretch-resistant food-grade packaging film; wherein the extrusion temperature is 200°C; the biaxial stretching includes longitudinal stretching and transverse stretching, the longitudinal stretching ratio is 2, and the transverse stretching ratio is 4; the heat setting temperature is 125°C.
[0051] Example 4 The present embodiment provides a stretch-resistant food-grade packaging film, and its raw material composition includes, by weight: 65 parts of PBAT, 12 parts of cellulose acetate, 10 parts of epoxy soybean oil acrylate, 4 parts of sodium cocoyl aminopropionate, 6.5 parts of polyacrylic acid intercalated hydrotalcite, 2.5 parts of antibacterial agent, 1.5 parts of antioxidant, and 1.5 parts of ultraviolet stabilizer; The antibacterial agent is Artemisia argyi extract; the antioxidant is butylated hydroxyanisole; the ultraviolet stabilizer is ultraviolet absorber UV-531; The production process includes the following steps: S1, mixing PBAT, cellulose acetate, epoxy soybean oil acrylate, sodium cocoyl aminopropionate, polyacrylic acid intercalated hydrotalcite, antibacterial agent, antioxidant and ultraviolet stabilizer to prepare a mixture; S2. The mixed material is fed into a twin-screw extruder for melt extrusion, cooling and molding, biaxial stretching, and heat setting to obtain a stretch-resistant food-grade packaging film; wherein the extrusion temperature is 200°C; the biaxial stretching includes longitudinal stretching and transverse stretching, the longitudinal stretching ratio is 2, and the transverse stretching ratio is 4; the heat setting temperature is 125°C.
[0052] Example 5 The present embodiment provides a stretch-resistant food-grade packaging film, and its raw material composition includes, by weight: 50 parts of PBAT, 10 parts of cellulose acetate, 20 parts of epoxy soybean oil acrylate, 5 parts of sodium cocoyl aminopropionate, 13 parts of polyacrylic acid intercalated hydrotalcite, 1 part of antibacterial agent, 0.5 parts of antioxidant, and 2 parts of ultraviolet stabilizer; The antibacterial agent is Artemisia argyi extract; the antioxidant is butylated hydroxyanisole; the ultraviolet stabilizer is ultraviolet absorber UV-531; The production process includes the following steps: S1, mixing PBAT, cellulose acetate, epoxy soybean oil acrylate, sodium cocoyl aminopropionate, polyacrylic acid intercalated hydrotalcite, antibacterial agent, antioxidant and ultraviolet stabilizer to prepare a mixture; S2. The mixed material is fed into a twin-screw extruder for melt extrusion, cooling and molding, biaxial stretching, and heat setting to obtain a stretch-resistant food-grade packaging film; wherein the extrusion temperature is 200°C; the biaxial stretching includes longitudinal stretching and transverse stretching, the longitudinal stretching ratio is 2, and the transverse stretching ratio is 4; the heat setting temperature is 125°C.
[0053] Comparative Examples 1 to 4 Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that epoxy soybean oil acrylate and polyacrylic acid intercalated hydrotalcite are not added in Comparative Example 1.
[0054] Comparative Example 2 The difference between Comparative Example 2 and Example 3 is that no epoxy soybean oil acrylate is added in Comparative Example 2.
[0055] Comparative Example 3 The difference between Comparative Example 3 and Example 3 is that no polyacrylic acid intercalated hydrotalcite is added in Comparative Example 3.
[0056] Comparative Example 4 The difference between Comparative Example 4 and Example 3 is that sodium cocoyl aminopropionate is not added in Comparative Example 4.
[0057] Experimental testing Test items and test methods According to GB / T 1040.3-2006 "Determination of tensile properties of plastics Part 3: Test conditions for thin plastics and sheets", the tensile strength and elongation at break of food-grade packaging films are measured; According to GB / T 20197-2006 “Definition, classification, labeling and degradation performance requirements of degradable plastics”, the biodegradability of food-grade packaging film is tested and the degradation rate is determined.
[0058] The food-grade packaging films prepared in Examples 1 to 5 and Comparative Examples 1 to 4 were tested for tensile strength, elongation at break and degradation rate. The test results are shown in Table 1.
[0059] Table 1 From the test results in Table 1, it can be seen that the food-grade packaging films prepared in Examples 1 to 5 have high tensile strength, elongation at break and degradation rate, good tensile resistance, good biodegradability and are environmentally friendly.
[0060] In Comparative Example 1, epoxy soybean oil acrylate and polyacrylic acid intercalated hydrotalcite were not added, and the tensile strength, elongation at break and degradation rate of the prepared food-grade packaging film were significantly reduced.
[0061] Comparative Example 2 did not add epoxy soybean oil acrylate, and Comparative Example 3 did not add polyacrylic acid intercalated hydrotalcite. The tensile strength and elongation at break of the prepared food-grade packaging film were both lower than those of Example 3.
[0062] In Comparative Example 4, sodium cocoyl aminopropionate was not added, and the tensile strength and elongation at break of the prepared food-grade packaging film were reduced.
[0063] Embodiments 6 to 12 Example 6 The difference between Example 6 and Example 3 is that in Example 6, the weight ratio of epoxy soybean oil acrylate and polyacrylic acid intercalated hydrotalcite is 1:1, and the total weight of epoxy soybean oil acrylate and polyacrylic acid intercalated hydrotalcite is 20 parts.
[0064] Example 7 The difference between Example 7 and Example 3 is that in Example 7, the weight ratio of epoxy soybean oil acrylate and polyacrylic acid intercalated hydrotalcite is 2:1, and the total weight of epoxy soybean oil acrylate and polyacrylic acid intercalated hydrotalcite is 20 parts.
[0065] Example 8 The difference between Example 8 and Example 3 is that in Example 8, the antibacterial agent is ε-polylysine.
[0066] Example 9 The difference between Example 9 and Example 3 is that in Example 9, the antioxidant is butylated hydroxytoluene.
[0067] Example 10 The difference between Example 10 and Example 3 is that in Example 10, the ultraviolet stabilizer is the ultraviolet absorber UV-329.
[0068] Embodiment 11 The difference between Example 11 and Example 3 is that in step S2 of Example 11, the extrusion temperature is 180°C; and the heat setting temperature is 100°C.
[0069] Example 12 The difference between Example 12 and Example 3 is that in step S2 of Example 12, the extrusion temperature is 230°C; and the heat setting temperature is 150°C.
[0070] The food-grade packaging films prepared in Examples 6 to 12 were tested for tensile strength, elongation at break and degradation rate. The test results are shown in Table 2.
[0071] Table 2 Tensile strength / MPa Elongation at break / % Degradation rate / % Example 6 37.1 205 87.3 Example 7 36.5 213 87.1 Example 8 37.6 216 87.9 Example 9 37.9 220 88.5 Example 10 37.5 215 88.1 Embodiment 11 37.2 212 87.7 Example 12 37.0 210 87.5 From the test results in Table 2, it can be seen that the difference between Example 6 and Example 7 and Example 3 is that the weight ratios of epoxidized soybean oil acrylate and polyacrylic acid intercalated hydrotalcite are different, among which the food-grade packaging film prepared in Example 3 has the best tensile strength, elongation at break and degradation rate.
[0072] Examples 8 to 10 respectively use different antimicrobial agents, antioxidants and UV stabilizers, and the tensile strength, elongation at break and degradation rate of the prepared food-grade packaging films are similar to those of Example 3.
[0073] The difference between Example 11 and Example 12 and Example 3 is that the extrusion temperature and the heat setting temperature of step S2 are different, wherein the food-grade packaging film prepared in Example 3 has higher tensile strength, elongation at break and degradation rate.
[0074] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A stretch-resistant food-grade packaging film, characterized in that: The raw material composition includes, by weight: 50-70 parts of PBAT, 10-20 parts of cellulose acetate, 5-20 parts of epoxy soybean oil acrylate, 1-5 parts of sodium cocoyl aminopropionate, 3-13 parts of polyacrylic acid intercalated hydrotalcite, 1-3 parts of antibacterial agent, 0.5-2 parts of antioxidant, and 0.5-2 parts of ultraviolet stabilizer.
2. The stretch-resistant food-grade packaging film according to claim 1, characterized in that: The raw material composition includes, by weight: 55-65 parts of PBAT, 12-18 parts of cellulose acetate, 10-15 parts of epoxy soybean oil acrylate, 2-4 parts of sodium cocoyl aminopropionate, 6.5-10 parts of polyacrylic acid intercalated hydrotalcite, 1.5-2.5 parts of antibacterial agent, 1-1.5 parts of antioxidant, and 1-1.5 parts of ultraviolet stabilizer.
3. The stretch-resistant food-grade packaging film according to claim 1, characterized in that: The raw material composition includes, by weight: 60 parts of PBAT, 15 parts of cellulose acetate, 12 parts of epoxy soybean oil acrylate, 3 parts of sodium cocoyl aminopropionate, 8 parts of polyacrylic acid intercalated hydrotalcite, 2 parts of antibacterial agent, 1.2 parts of antioxidant, and 1.2 parts of ultraviolet stabilizer.
4. The stretch-resistant food-grade packaging film according to claim 1, characterized in that: The weight ratio of the epoxy soybean oil acrylate to the polyacrylic acid intercalated hydrotalcite is 1-2:
1.
5. The stretch-resistant food-grade packaging film according to claim 1, characterized in that: The preparation method of the polyacrylic acid intercalated hydrotalcite is: Step 1: Mix Mg(NO3)2·6H2O and Al(NO3)3·9H2O, add water to dissolve, and prepare a mixed salt solution; Mg 2+ and Al 3+ The molar ratio is 2~3:1; Step 2: adding a sodium hydroxide solution dropwise to the mixed salt solution, stirring to generate a precipitate, separating, washing, and drying to obtain a basic hydrotalcite; Step 3: ultrasonically dispersing the basic hydrotalcite in water to obtain a hydrotalcite suspension; Step 4: adding polyacrylic acid to the hydrotalcite suspension, adding potassium persulfate, stirring, separating, washing, and drying to obtain polyacrylic acid intercalated hydrotalcite.
6. The stretch-resistant food-grade packaging film according to claim 1, characterized in that: The antibacterial agent is selected from at least one of chitosan, ε-polylysine, mugwort extract and curcumin.
7. The stretch-resistant food-grade packaging film according to claim 1, characterized in that: The antioxidant is selected from at least one of butylated hydroxyanisole, butylated hydroxytoluene and propyl gallate.
8. The stretch-resistant food-grade packaging film according to claim 1, characterized in that: The ultraviolet stabilizer is selected from at least one of ultraviolet absorber UV-531 and ultraviolet absorber UV-329.
9. A production process for the stretch-resistant food-grade packaging film according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, mixing the PBAT, cellulose acetate, epoxy soybean oil acrylate, sodium cocoyl aminopropionate, polyacrylic acid intercalated hydrotalcite, antibacterial agent, antioxidant and ultraviolet stabilizer to prepare a mixture; S2, feeding the mixed material into a twin-screw extruder, melting and extruding, cooling and forming, biaxially stretching, and heat-setting to obtain a stretch-resistant food-grade packaging film.
10. The production process of the stretch-resistant food-grade packaging film according to claim 9, characterized in that: In the step S2, the extrusion temperature is 180-230°C; the heat setting temperature is 100-150°C.