Environment-friendly composite degradable packaging structure design and manufacturing method thereof

Abstract

The invention belongs to the technical field of packaging structures, and provides a green composite degradable packaging structure design and a manufacturing method thereof. The inner layer material is prepared from polylactic acid, polyester, maleimide compounds, triethanolamine and a heat stabilizer; wherein the packaging structure is of a spherical, cubic or cylindrical structure; the green composite degradable packaging structure provided by the invention is made of a bio-based material, can be quickly degraded under specific conditions, reduces environmental pollution, and meets the green and environment-friendly requirements; through the reasonable packaging structure and form design, the packaging rigidity and strength are improved, and the requirements for secondary packaging and transportation packaging are reduced, so that materials are saved, and the packaging cost is reduced; meanwhile, the environment-friendly composite degradable packaging structure is beneficial for reducing resource waste, promoting recycling of resources and promoting the society to develop in a more sustainable direction.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging structures, in particular to a green composite degradable packaging structure design and a manufacturing method thereof. Background Art

[0002] With the strengthening of environmental protection awareness, traditional packaging materials such as plastics are difficult to degrade, causing long-term pollution to the natural environment. At the same time, the production of these materials consumes a lot of energy and emits greenhouse gases. Therefore, green packaging, as an effective way to reduce environmental pollution and reduce resource waste, is gaining favor from more and more companies and consumers. Green packaging can not only help companies establish a good brand image in market competition, but also promote the entire society to develop in a more sustainable direction.

[0003] At present, bio-based materials have become an important choice for green packaging materials due to their good biodegradability. Under certain conditions, they can be decomposed into water and carbon dioxide by microorganisms in nature without causing persistent pollution. Some products based on bio-based materials such as PLA (polylactic acid) have appeared on the market and are widely used in the field of food packaging. However, in the actual promotion process, green packaging still faces the problem of high cost and inability to be promoted and applied on a large scale.

[0004] To this end, those skilled in the art have proposed a green composite degradable packaging structure design and a manufacturing method thereof to solve the problems raised by the background technology. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a green composite degradable packaging structure design and a manufacturing method thereof, so as to solve the problems faced by green packaging in the prior art, such as high cost and inability to be promoted and applied on a large scale.

[0006] A green composite degradable packaging structure, comprising:

[0007] The packaging material is composed of the following components by weight: 28-36 parts of polybutylene succinate, 31-44 parts of polycaprolactone, 25-36 parts of wheat straw fiber, 6-12 parts of propylene glycol, 18-29 parts of modified starch, 1-5 parts of dispersant, 2-7 parts of defoamer, 1.8-4.7 parts of titanate coupling agent, 3-8 parts of plasticizer, 4-8.2 parts of nisin, and environmentally friendly additives;

[0008] The inner layer material is composed of polylactic acid, polyester, maleimide compound, triethanolamine and heat stabilizer;

[0009] The packaging structure adopts a spherical, cubic or cylindrical structure through a reasonable packaging shape design to save raw materials to the maximum extent and improve the rigidity and strength of the packaging.

[0010] Preferably, the packaging structure further comprises a partition plate, and the partition plate is arranged in the middle position between the packaging material and the inner layer material.

[0011] Preferably, the preparation method of the modified starch comprises: adding 10g of starch to 100mL of 95wt% ethanol, adding 42g of polyvinyl alcohol at the same time, stirring evenly, adding a 40wt% sodium hydroxide solution while stirring, wherein the amount of sodium hydroxide is 3% of the dry weight of the starch, stirring for 15 minutes, adding a certain amount of propylene oxide, and flushing with nitrogen protection at the same time, heating to 75°C in a constant temperature water bath, and keeping the temperature for reaction for 10h; after the etherification reaction, adjusting the pH to 6.5 with 10% hydrochloric acid, washing the reaction product with 90% ethanol, and filtering, washing, drying and crushing the emulsion.

[0012] Preferably, the dispersant is a mixture of hydroxyethyl cellulose, sodium polyacrylate and polyethylene glycol in a weight ratio of 4:2:1.

[0013] Preferably, the defoaming agent is polyoxyethylene polyoxypropanolamine ether.

[0014] Preferably, the plasticizer is tributyl citrate.

[0015] Preferably, a method for manufacturing a green composite degradable packaging structure is characterized in that: using the above-mentioned green composite degradable packaging structure, the method comprises the following steps:

[0016] S1, mixing wheat straw fiber and titanate coupling agent in a high-speed mixer;

[0017] S2, mixing polybutylene succinate, polycaprolactone, propylene glycol, modified starch and dispersant, and then adding plasticizer, defoamer and nisin and continuing to mix;

[0018] S3. The mixed material is extruded into granules using a twin-screw extruder. The extruded granules are molded on a flat vulcanizer and then cooled and demolded to obtain a composite material sample.

[0019] Preferably, in step S1, the mixing time in the high-speed mixer is 20 minutes and the temperature is 65°C.

[0020] Preferably, in step S1, the mixing time in the high-speed mixer is 20 minutes and the temperature is 65°C.

[0021] Preferably, in step S3, the plate vulcanizing press is operated at 170° C. and 15 MPa.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. Environmental performance: The green composite degradable packaging structure provided by the present invention is made of bio-based materials, can be rapidly degraded under certain conditions, reduces environmental pollution, and meets green environmental protection requirements;

[0024] 2. Save materials: Through reasonable packaging structure and shape design, the rigidity and strength of the packaging can be improved, and the requirements for secondary packaging and transport packaging can be reduced, thereby saving materials and reducing packaging costs;

[0025] 3. Wide application scope: The green composite degradable packaging structure of the present invention is not only applicable to the field of food packaging, but also can be applied to other fields that require packaging protection, such as electronic products, cosmetics, etc.;

[0026] 4. Promote sustainable development: Promoting the use of green packaging is an indispensable part of achieving sustainable development goals; the green composite degradable packaging structure of the present invention helps to reduce resource waste, promote the recycling of resources, and promote social development in a more sustainable direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the green composite degradable packaging structure of the present invention;

[0028] Figure 2 The present invention is a flow chart of the manufacturing method of the green composite degradable packaging structure. DETAILED DESCRIPTION

[0029] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] Embodiment: The present invention provides a green composite degradable packaging structure, such as Figure 1 As shown, the packaging structure includes:

[0031] The packaging material is composed of the following components by weight: 28-36 parts of polybutylene succinate, 31-44 parts of polycaprolactone, 25-36 parts of wheat straw fiber, 6-12 parts of propylene glycol, 18-29 parts of modified starch, 1-5 parts of dispersant, 2-7 parts of defoamer, 1.8-4.7 parts of titanate coupling agent, 3-8 parts of plasticizer, 4-8.2 parts of nisin, and environmentally friendly additives such as bio-based lubricants, antioxidants or ultraviolet absorbers;

[0032] The inner layer material is composed of polylactic acid, polyester, maleimide compound, triethanolamine and heat stabilizer;

[0033] Wherein, the packaging structure adopts a spherical, cubic or cylindrical structure;

[0034] The packaging structure further comprises a partition plate, which is arranged in the middle of the packaging material and the inner layer material;

[0035] The preparation method of the modified starch comprises: adding 10g of starch to 100mL of 95wt% ethanol, adding 42g of polyvinyl alcohol at the same time, stirring evenly, adding a sodium hydroxide solution with a mass fraction of 40wt% while stirring, wherein the amount of sodium hydroxide is 3% of the dry weight of the starch, stirring for 15 minutes, adding a certain amount of propylene oxide, flushing with nitrogen protection at the same time, heating to 75°C in a constant temperature water bath, and keeping the temperature for reaction for 10h; adjusting the pH to 6.5 with hydrochloric acid with a mass fraction of 10% after the etherification reaction, washing the reaction product with 90% ethanol, filtering, washing, drying and crushing the emulsion;

[0036] The dispersant is a mixture of hydroxyethyl cellulose, sodium polyacrylate and polyethylene glycol in a weight ratio of 4:2:1;

[0037] The defoamer is polyoxyethylene polyoxypropanolamine ether;

[0038] The plasticizer is tributyl citrate;

[0039] A method for manufacturing a green composite degradable packaging structure, using the above-mentioned green composite degradable packaging structure, such as Figure 2 As shown, the following steps are included:

[0040] S1. Mix 25-36 parts of wheat straw fiber and 1.8-4.7 parts of titanate coupling agent in a high-speed mixer for 20 minutes at a temperature of 65°C. The high-speed mixer is equipped with a temperature control system to maintain the temperature in the mixer at 65°C and to adjust dynamically according to real-time feedback during the mixing process. For example, when an upward trend in the temperature of the mixed material is detected, the cooling device is automatically started to ensure that the temperature is always maintained within the optimal range to improve the mixing effect and material properties. Before formal mixing, the wheat straw fiber is pretreated, such as crushing, screening or pre-wetting, to improve its compatibility with other components. At the same time, the titanate coupling agent can be added to the mixer in stages to control the reaction rate and mixing effect.

[0041] S2, 28-36 parts of polybutylene succinate, 31-44 parts of polycaprolactone, 6-12 parts of propylene glycol, 18-29 parts of modified starch and 1-5 parts of dispersant, high-speed mixing for 10 minutes, then adding 3-8 parts of plasticizer and continuing to mix for 5 minutes, then adding 2-7 parts of defoamer and 4-8.2 parts of nisin and environmentally friendly additives and continuing to mix for 10 minutes, the mixing temperature is 70°C;

[0042] S3. The mixed material in step 2 is extruded and granulated at 170° C. using a twin-screw extruder. The extruded granules are molded at 170° C. and 15 MPa using a flat vulcanizer for 10 min, and then cooled and demolded to obtain a composite material sample.

[0043] From the above, it can be seen that the green composite degradable packaging structure provided by the present invention is made of bio-based materials, can be rapidly degraded under specific conditions, reduces environmental pollution, and meets green environmental protection requirements; through reasonable packaging structure and morphological design, the rigidity and strength of the packaging are improved, and the requirements for secondary packaging and transport packaging are reduced, thereby saving materials and reducing packaging costs; at the same time, the green composite degradable packaging structure of the present invention is not only suitable for the field of food packaging, but also can be applied to other fields that require packaging protection, such as electronic products, cosmetics, etc.; promoting the use of green packaging is an indispensable part of achieving sustainable development goals; the green composite degradable packaging structure of the present invention helps to reduce resource waste, promote the recycling of resources, and promote social development in a more sustainable direction.

[0044] Embodiment 1: This embodiment proposes a green composite degradable packaging structure, which includes:

[0045] The packaging material is composed of the following components by weight: 28 parts of polybutylene succinate, 31 parts of polycaprolactone, 25 parts of wheat straw fiber, 6 parts of propylene glycol, 18 parts of modified starch, 1 part of dispersant, 2 parts of defoamer, 1.8 parts of titanate coupling agent, 3 parts of plasticizer, 4 parts of nisin, and environmentally friendly additives;

[0046] The inner layer material is composed of polylactic acid, polyester, maleimide compound, triethanolamine and heat stabilizer;

[0047] Wherein, the packaging structure adopts a spherical, cubic or cylindrical structure;

[0048] The packaging structure further comprises a partition plate, which is arranged in the middle of the packaging material and the inner layer material;

[0049] The preparation method of the modified starch comprises: adding 10g of starch to 100mL of 95wt% ethanol, adding 42g of polyvinyl alcohol at the same time, stirring evenly, adding a sodium hydroxide solution with a mass fraction of 40wt% while stirring, wherein the amount of sodium hydroxide is 3% of the dry weight of the starch, stirring for 15 minutes, adding a certain amount of propylene oxide, flushing with nitrogen protection at the same time, heating to 75°C in a constant temperature water bath, and keeping the temperature for reaction for 10h; adjusting the pH to 6.5 with hydrochloric acid with a mass fraction of 10% after the etherification reaction, washing the reaction product with 90% ethanol, filtering, washing, drying and crushing the emulsion;

[0050] The dispersant is a mixture of hydroxyethyl cellulose, sodium polyacrylate and polyethylene glycol in a weight ratio of 4:2:1;

[0051] The defoamer is polyoxyethylene polyoxypropanolamine ether;

[0052] The plasticizer is tributyl citrate;

[0053] A method for manufacturing a green composite degradable packaging structure, using the above-mentioned green composite degradable packaging structure, comprises the following steps:

[0054] S1, mixing 25 parts of wheat straw fiber and 1.8 parts of titanate coupling agent in a high-speed mixer for 20 minutes at a temperature of 65°C;

[0055] S2, 28 parts of polybutylene succinate, 31 parts of polycaprolactone, 6 parts of propylene glycol, 18 parts of modified starch and 1 part of dispersant were mixed at high speed for 10 minutes, and then 3 parts of plasticizer were added and mixed for 5 minutes, and then 2 parts of defoamer and 4 parts of nisin were added and mixed for 10 minutes, and the mixing temperature was 70°C;

[0056] S3. The mixed material in step 2 is extruded and granulated at 170° C. using a twin-screw extruder. The extruded granules are molded at 170° C. and 15 MPa using a flat vulcanizer for 10 min, and then cooled and demolded to obtain a composite material sample.

[0057] Embodiment 2: This embodiment proposes a green composite degradable packaging structure, which includes:

[0058] The packaging material is composed of the following components by weight: 32 parts of polybutylene succinate, 37 parts of polycaprolactone, 30 parts of wheat straw fiber, 9 parts of propylene glycol, 24 parts of modified starch, 3 parts of dispersant, 5 parts of defoamer, 3.2 parts of titanate coupling agent, 5 parts of plasticizer, 6.1 parts of nisin, and environmentally friendly additives;

[0059] The inner layer material is composed of polylactic acid, polyester, maleimide compound, triethanolamine and heat stabilizer;

[0060] Wherein, the packaging structure adopts a spherical, cubic or cylindrical structure;

[0061] The packaging structure further comprises a partition plate, which is arranged in the middle of the packaging material and the inner layer material;

[0062] The preparation method of the modified starch comprises: adding 10g of starch to 100mL of 95wt% ethanol, adding 42g of polyvinyl alcohol at the same time, stirring evenly, adding a sodium hydroxide solution with a mass fraction of 40wt% while stirring, wherein the amount of sodium hydroxide is 3% of the dry weight of the starch, stirring for 15 minutes, adding a certain amount of propylene oxide, flushing with nitrogen protection at the same time, heating to 75°C in a constant temperature water bath, and keeping the temperature for reaction for 10h; adjusting the pH to 6.5 with hydrochloric acid with a mass fraction of 10% after the etherification reaction, washing the reaction product with 90% ethanol, filtering, washing, drying and crushing the emulsion;

[0063] The dispersant is a mixture of hydroxyethyl cellulose, sodium polyacrylate and polyethylene glycol in a weight ratio of 4:2:1;

[0064] The defoamer is polyoxyethylene polyoxypropanolamine ether;

[0065] The plasticizer is tributyl citrate;

[0066] A method for manufacturing a green composite degradable packaging structure, using the above-mentioned green composite degradable packaging structure, comprises the following steps:

[0067] S1, mixing 30 parts of wheat straw fiber and 3.2 parts of titanate coupling agent in a high-speed mixer for 20 minutes at a temperature of 65°C;

[0068] S2, 32 parts of polybutylene succinate, 37 parts of polycaprolactone, 9 parts of propylene glycol, 24 parts of modified starch and 3 parts of dispersant were mixed at high speed for 10 minutes, and then 5 parts of plasticizer were added and mixed for 5 minutes, and then 5 parts of defoamer and 6.1 parts of nisin were added and mixed for 10 minutes, and the mixing temperature was 70°C;

[0069] S3. The mixed material in step 2 is extruded and granulated at 170° C. using a twin-screw extruder. The extruded granules are molded at 170° C. and 15 MPa using a flat vulcanizer for 10 min, and then cooled and demolded to obtain a composite material sample.

[0070] Embodiment 3: This embodiment proposes a green composite degradable packaging structure, which includes:

[0071] The packaging material is composed of the following components by weight: 36 parts of polybutylene succinate, 44 parts of polycaprolactone, 36 parts of wheat straw fiber, 12 parts of propylene glycol, 29 parts of modified starch, 5 parts of dispersant, 7 parts of defoamer, 4.7 parts of titanate coupling agent, 8 parts of plasticizer, 8.2 parts of nisin, and environmentally friendly additives;

[0072] The inner layer material is composed of polylactic acid, polyester, maleimide compound, triethanolamine and heat stabilizer;

[0073] Wherein, the packaging structure adopts a spherical, cubic or cylindrical structure;

[0074] The packaging structure further comprises a partition plate, which is arranged in the middle of the packaging material and the inner layer material;

[0075] The preparation method of the modified starch comprises: adding 10g of starch to 100mL of 95wt% ethanol, adding 42g of polyvinyl alcohol at the same time, stirring evenly, adding a sodium hydroxide solution with a mass fraction of 40wt% while stirring, wherein the amount of sodium hydroxide is 3% of the dry weight of the starch, stirring for 15 minutes, adding a certain amount of propylene oxide, flushing with nitrogen protection at the same time, heating to 75°C in a constant temperature water bath, and keeping the temperature for reaction for 10h; adjusting the pH to 6.5 with hydrochloric acid with a mass fraction of 10% after the etherification reaction, washing the reaction product with 90% ethanol, filtering, washing, drying and crushing the emulsion;

[0076] The dispersant is a mixture of hydroxyethyl cellulose, sodium polyacrylate and polyethylene glycol in a weight ratio of 4:2:1;

[0077] The defoamer is polyoxyethylene polyoxypropanolamine ether;

[0078] The plasticizer is tributyl citrate;

[0079] A method for manufacturing a green composite degradable packaging structure, using the above-mentioned green composite degradable packaging structure, comprises the following steps:

[0080] S1, mixing 36 parts of wheat straw fiber and 4.7 parts of titanate coupling agent in a high-speed mixer for 20 minutes at a temperature of 65°C;

[0081] S2, 36 parts of polybutylene succinate, 44 parts of polycaprolactone, 12 parts of propylene glycol, 29 parts of modified starch and 5 parts of dispersant were mixed at high speed for 10 minutes, and then 8 parts of plasticizer were added and mixed for 5 minutes, and then 7 parts of defoamer and 8.2 parts of nisin were added and mixed for 10 minutes, and the mixing temperature was 70°C;

[0082] S3. The mixed material in step 2 is extruded and granulated at 170° C. using a twin-screw extruder. The extruded granules are molded at 170° C. and 15 MPa using a flat vulcanizer for 10 min, and then cooled and demolded to obtain a composite material sample.

[0083] Comparative Example: A packaging material based on bio-based materials, comprising: polylactic acid (PLA): 50-70 parts; polycaprolactone (PCL): 10-20 parts; lignin fiber: 10-20 parts; talcum powder: 5-10 parts; dispersant (conventional type): 0.5-1.5 parts; plasticizer (such as phthalates): 2-5 parts;

[0084] A method for preparing a packaging material obtained from the above-mentioned material comprises the following steps:

[0085] Step 1, raw material preparation: weigh polylactic acid, polycaprolactone, lignin fiber, talcum powder, dispersant and plasticizer according to the above proportions;

[0086] Step 2, mixing: polylactic acid, polycaprolactone, lignin fiber and talcum powder are mixed evenly in a high-speed mixer for about 15 minutes at room temperature; dispersant and plasticizer are added, and mixing is continued for 5-10 minutes to ensure that all ingredients are fully mixed;

[0087] Step 3: Granulation: The mixed materials are fed into a twin-screw extruder and melt-extruded and granulated at a temperature of about 180°C;

[0088] Step 4: Molding: The extruded pellets are processed into the desired packaging products through injection molding, blow molding or other molding processes.

[0089] Furthermore, the effects of Examples 1 to 3 were compared with the comparative example, and a comparison table was obtained as follows:

[0090]

[0091]

[0092] From the above, it can be seen that Examples 1 to 3 are superior to the control examples in terms of environmental performance, cost, mechanical properties, degradation performance, application range, and comprehensive performance evaluation. The application effect of this green composite degradable packaging structure design and its manufacturing method is high and suitable for large-scale promotion.

[0093] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A green composite degradable packaging structure, characterized in that: The packaging structure comprises: The packaging material is composed of the following components by weight: 28-36 parts of polybutylene succinate, 31-44 parts of polycaprolactone, 25-36 parts of wheat straw fiber, 6-12 parts of propylene glycol, 18-29 parts of modified starch, 1-5 parts of dispersant, 2-7 parts of defoamer, 1.8-4.7 parts of titanate coupling agent, 3-8 parts of plasticizer, 4-8.2 parts of nisin, and environmentally friendly additives; The inner layer material is composed of polylactic acid, polyester, maleimide compound, triethanolamine and heat stabilizer; Wherein, the packaging structure adopts a spherical, cubic or cylindrical structure.

2. A green composite degradable packaging structure as claimed in claim 1, characterized in that: The packaging structure also includes a partition plate.

3. A green composite degradable packaging structure as claimed in claim 1, characterized in that: The preparation method of the modified starch comprises: adding 10g of starch to 100mL of 95wt% ethanol, adding 42g of polyvinyl alcohol at the same time, stirring evenly, adding a sodium hydroxide solution with a mass fraction of 40wt% while stirring, wherein the amount of sodium hydroxide is 3% of the dry weight of the starch, stirring for 15 minutes, adding a certain amount of propylene oxide, flushing with nitrogen protection at the same time, heating to 75°C in a constant temperature water bath, and keeping the temperature for reaction for 10h; after the etherification reaction, adjusting the pH to 6.5 with hydrochloric acid with a mass fraction of 10%, washing the reaction product with 90% ethanol, filtering, washing, drying and crushing the emulsion.

4. A green composite degradable packaging structure as claimed in claim 1, characterized in that: The dispersant is prepared by mixing hydroxyethyl cellulose, sodium polyacrylate and polyethylene glycol in a weight ratio of 4:2:

1.

5. A green composite degradable packaging structure as claimed in claim 1, characterized in that: The defoamer is polyoxyethylene polyoxypropanolamine ether.

6. A green composite degradable packaging structure as claimed in claim 1, characterized in that: The plasticizer is tributyl citrate.

7. A method for manufacturing a green composite degradable packaging structure, characterized in that: Using a green composite degradable packaging structure as described in any one of claims 1 to 6, characterized in that it includes the following steps: S1, mixing wheat straw fiber and titanate coupling agent in a high-speed mixer; S2, mixing polybutylene succinate, polycaprolactone, propylene glycol, modified starch and dispersant, and then adding plasticizer, defoamer and nisin and continuing to mix; S3. The mixed material is extruded into granules using a twin-screw extruder. The extruded granules are molded on a flat vulcanizer and then cooled and demolded to obtain a composite material sample.

8. A green composite degradable packaging structure design and manufacturing method as claimed in claim 7, characterized in that: In step S1, the mixing time in the high-speed mixer is 20 minutes and the temperature is 65°C.

9. A green composite degradable packaging structure design and manufacturing method as claimed in claim 7, characterized in that: In step S2, the first mixing time is 5 minutes, and the second mixing time is 10 minutes.

10. A green composite degradable packaging structure design and manufacturing method as claimed in claim 7, characterized in that: In step S3, the plate vulcanizing press is operated at 170° C. and 15 MPa.

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