An environmentally friendly heat-insulating plastic bottle and its preparation process

Abstract

This invention discloses an environmentally friendly heat-insulating plastic bottle and its preparation process, comprising the following components: polylactic acid resin, grafted modified bamboo powder composite, plasticizer, inorganic filler, nano-silica, antioxidant, and lubricant. The plastic bottle prepared by this invention is biodegradable and poses no pollution risk to the environment, thus enabling large-scale use and aligning with current green development themes. This invention uses bamboo powder as a raw material to prepare a grafted modified bamboo powder composite, which not only significantly improves the mechanical properties of the prepared plastic bottle but also enhances its heat insulation performance. Furthermore, bamboo powder, as a natural material, is widely available and renewable, with low cost, making it more economical. The bamboo powder used is biodegradable, meeting environmental protection requirements.

Description

Technical Field

[0001] This invention belongs to the field of environmental protection materials technology, and specifically relates to an environmentally friendly heat-insulating plastic bottle and its preparation process. Background Technology

[0002] Plastic bottles are primarily used for packaging various liquid or solid products. They are widely used in various fields, including but not limited to: 1. Food and beverage industry: Used for packaging various food and beverages such as drinking water, juice, dairy products, and condiments.

[0003] 2. Cosmetics industry: Used for packaging various cosmetics such as shampoo, shower gel, skin care products, and perfumes.

[0004] 3. Pharmaceutical industry: Used for packaging medicines, medical devices and other medical supplies.

[0005] 4. Other fields: such as chemical packaging, daily necessities packaging, etc.

[0006] With the increasing environmental awareness of people and the continuous development of technology, the application of conventional polyethylene plastic bottles is becoming more and more restricted. Because polyethylene plastic bottles cannot be degraded in a short time, they will cause large-scale white pollution and impose a significant burden on the environment.

[0007] To reduce environmental impact, existing technologies have begun to use environmentally friendly materials such as polylactic acid (PLA) to process and manufacture plastic bottles. However, plastic bottles made of pure PLA have relatively poor heat insulation properties, which limits their application.

[0008] Therefore, the present invention solves the corresponding problem by providing an environmentally friendly heat-insulating plastic bottle. Summary of the Invention

[0009] The purpose of this invention is to provide an environmentally friendly, heat-insulating plastic bottle to overcome the shortcomings of existing technologies.

[0010] The technical solution adopted in this invention is based on the following: An environmentally friendly heat-insulating plastic bottle is made of the following components by weight: 70-78 parts polylactic acid resin, 35-38 parts grafted modified bamboo powder composite, 2-3 parts plasticizer, 12-16 parts inorganic filler, 8-10 parts nano silica, 0.3-0.5 parts antioxidant, and 0.6-0.8 parts lubricant.

[0011] As a further technical solution: the method for preparing the grafted modified bamboo powder is as follows: First, prepare a sodium chloride solution by adding bamboo powder to the sodium chloride solution, adjusting the temperature to 60°C, keeping it in a water bath, and stirring for 30 minutes. Then, add sodium hydroxide solution dropwise to the sodium chloride solution over 10 minutes. Continue stirring for 2 hours after the addition is complete. Then, add maleic anhydride and continue stirring for 3 hours to obtain an intermediate mixture. The intermediate mixture was adjusted to neutral pH to obtain a neutral mixture, which was then filtered and vacuum dried to obtain grafted bamboo powder. Grafted bamboo powder, corn starch, caprolactam, and glycerol were added to a mixer in sequence and mixed evenly to obtain a preliminary mixture. The preliminary mixture was added to a twin-screw extruder for extrusion granulation and cooling to obtain the grafted modified bamboo powder composite.

[0012] As a further technical solution: the sodium chloride solution has a mass fraction of 1%; The mixing ratio of bamboo powder and sodium chloride solution is 22-25g: 200mL; The volume ratio of sodium chloride solution to sodium hydroxide solution is 5:1; The sodium hydroxide solution has a mass fraction of 5%. The mass ratio of maleic anhydride to bamboo powder is 1:10-12.

[0013] As a further technical solution: the vacuum drying temperature is 55℃ and the time is 2 hours.

[0014] As a further technical solution: the mass ratio of the grafted bamboo powder, corn starch, caprolactam, and glycerol is 30:5:1:3; The stirring speed was 500 r / min, and the stirring time was 30 min.

[0015] As a further technical solution: the temperatures of zones 1-5 of the twin-screw extruder are 115, 118, 125, 120, and 118°C, respectively, the die head temperature is 114°C, and the screw speed is 150 r / min.

[0016] As a further technical solution: the plasticizer is epoxidized soybean oil; The inorganic filler is calcium carbonate.

[0017] As a further technical solution: the antioxidant is thiopropionate; The lubricant is glyceryl monostearate.

[0018] A manufacturing process for an environmentally friendly, heat-insulating plastic bottle includes the following steps: (1) Preparation of materials: Weigh the following materials according to their weight parts: polylactic acid resin, grafted modified bamboo powder composite, plasticizer, inorganic filler, nano silica, antioxidant, and lubricant; (2) Mixing: Add the above components to the mixer in sequence and mix them evenly to obtain a mixture. (3) Granulation: The above mixture is added to a twin-screw extruder for melt extrusion granulation to obtain masterbatch; (4) Blow molding: The masterbatch obtained above is injected into the mold cavity through an injection molding machine, and then blow molded at 175°C using hot air blow molding method, and then annealed at 155°C for 2 hours to obtain an environmentally friendly heat-insulating plastic bottle.

[0019] As a further technical solution: in step (2), the stirring speed in the mixer is 800 r / min and the stirring time is 35 min; In step (3), the temperatures of zones 1-5 of the twin-screw extruder are 150, 180, 195, 200, and 205°C, respectively, the die head temperature is 165°C, and the screw speed is 50 r / min. Beneficial effects

[0020] The plastic bottles prepared by this invention are biodegradable and do not pose a pollution threat to the environment. Therefore, they can be used on a large scale, which is in line with the current theme of green development.

[0021] This invention uses bamboo powder as raw material to prepare a grafted modified bamboo powder composite, which can not only greatly improve the mechanical properties of the prepared plastic bottle, but also improve the heat insulation performance of the prepared plastic bottle. Moreover, bamboo powder is a natural material that is widely available and renewable, with low cost and greater economic benefits. The bamboo powder used is biodegradable and meets environmental protection requirements.

[0022] Directly introducing bamboo powder has limited reinforcing effect on plastic bottles, and it is prone to uneven dispersion in the plastic bottle system. Therefore, this invention prepares a grafted modified bamboo powder composite based on bamboo powder, which can further enhance the mechanical properties, thermal stability and other functional characteristics of the prepared plastic bottle.

[0023] Through appropriate treatment, the interfacial compatibility between bamboo powder and polylactic acid can be greatly improved, thereby improving the overall performance of the composite material.

[0024] This invention introduces grafted modified bamboo powder composites, which can introduce functional groups or structures with heat insulation functions, significantly improving the UV shielding performance and thermal stability of the produced plastic bottles. The grafted modified bamboo powder composites can form a certain barrier layer in the polylactic acid material system, which reduces the heat transfer path and significantly lowers the thermal conductivity, thereby enabling the plastic bottles to maintain a more stable internal temperature when heated.

[0025] This invention utilizes the combined effect of grafted modified bamboo powder composite and nano-silica to achieve good interfacial interaction with polylactic acid, thereby helping to improve the overall performance of plastic bottles. Furthermore, this interaction can reduce defects and voids at the interface, thus improving the density and heat insulation performance of plastic bottles. Attached Figure Description

[0026] Figure 1 This is a flowchart illustrating the manufacturing process of an environmentally friendly, heat-insulating plastic bottle. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The following are specific embodiments. Example 1

[0029] A manufacturing process for an environmentally friendly, heat-insulating plastic bottle includes the following steps: (1) Preparation of materials: Weigh the following materials according to their weight: 70 parts polylactic acid resin, 35 parts grafted modified bamboo powder composite, 2 parts epoxidized soybean oil, 12 parts calcium carbonate, 8 parts nano silica, 0.3 parts thiopropionate, and 0.6 parts glyceryl monostearate. The plasticizer is: The preparation method of grafted modified bamboo powder is as follows: First, prepare a sodium chloride solution by adding bamboo powder to the sodium chloride solution, adjusting the temperature to 60°C, keeping it in a water bath, and stirring for 30 minutes. Then, add sodium hydroxide solution dropwise to the sodium chloride solution over 10 minutes. Continue stirring for 2 hours after the addition is complete. Then, add maleic anhydride and continue stirring for 3 hours to obtain an intermediate mixture. The intermediate mixture was adjusted to neutral pH to obtain a neutral mixture, which was then filtered and vacuum dried to obtain grafted bamboo powder. Grafted bamboo powder, corn starch, caprolactam, and glycerol were added to a mixer in sequence and mixed evenly to obtain a preliminary mixture. The preliminary mixture was added to a twin-screw extruder for extrusion granulation and cooling to obtain the grafted modified bamboo powder composite.

[0030] The sodium chloride solution has a mass fraction of 1%. The mixing ratio of bamboo powder and sodium chloride solution is 22g:200mL; The volume ratio of sodium chloride solution to sodium hydroxide solution is 5:1; The sodium hydroxide solution has a mass fraction of 5%. The mass ratio of maleic anhydride to bamboo powder is 1:10.

[0031] The vacuum drying temperature is 55℃ and the time is 2 hours.

[0032] The mass ratio of grafted bamboo powder, corn starch, caprolactam, and glycerol is 30:5:1:3. The stirring speed was 500 r / min, and the stirring time was 30 min.

[0033] The temperatures of zones 1-5 of the twin-screw extruder are 115, 118, 125, 120, and 118°C, respectively, the die head temperature is 114°C, and the screw speed is 150 r / min.

[0034] (2) Mixing: Add the above components to the mixer in sequence and mix them evenly to obtain a mixture; the mixing speed in the mixer is 800 r / min and the mixing time is 35 min; (3) Granulation: The above mixture is added to a twin-screw extruder for melt extrusion granulation to obtain masterbatch; the temperatures of zones 1-5 of the twin-screw extruder are 150, 180, 195, 200, and 205℃, respectively, the die head temperature is 165℃, and the screw speed is 50r / min.

[0035] (4) Blow molding: The masterbatch obtained above is injected into the mold cavity through an injection molding machine, and then blow molded at 175°C using hot air blow molding method, and then annealed at 155°C for 2 hours to obtain an environmentally friendly heat-insulating plastic bottle. Example 2

[0036] A manufacturing process for an environmentally friendly, heat-insulating plastic bottle includes the following steps: (1) Preparation of materials: Weigh the following materials according to their weight: 72 parts polylactic acid resin, 36 parts grafted modified bamboo powder composite, 2.5 parts epoxidized soybean oil, 15 parts calcium carbonate, 9 parts nano silica, 0.4 parts thiopropionate, and 0.7 parts glyceryl monostearate. The plasticizer is: The preparation method of grafted modified bamboo powder is as follows: First, prepare a sodium chloride solution by adding bamboo powder to the sodium chloride solution, adjusting the temperature to 60°C, keeping it in a water bath, and stirring for 30 minutes. Then, add sodium hydroxide solution dropwise to the sodium chloride solution over 10 minutes. Continue stirring for 2 hours after the addition is complete. Then, add maleic anhydride and continue stirring for 3 hours to obtain an intermediate mixture. The intermediate mixture was adjusted to neutral pH to obtain a neutral mixture, which was then filtered and vacuum dried to obtain grafted bamboo powder. Grafted bamboo powder, corn starch, caprolactam, and glycerol were added to a mixer in sequence and mixed evenly to obtain a preliminary mixture. The preliminary mixture was added to a twin-screw extruder for extrusion granulation and cooling to obtain the grafted modified bamboo powder composite.

[0037] The sodium chloride solution has a mass fraction of 1%. The mixing ratio of bamboo powder and sodium chloride solution is 24g:200mL; The volume ratio of sodium chloride solution to sodium hydroxide solution is 5:1; The sodium hydroxide solution has a mass fraction of 5%. The mass ratio of maleic anhydride to bamboo powder is 1:11.

[0038] The vacuum drying temperature is 55℃ and the time is 2 hours.

[0039] The mass ratio of grafted bamboo powder, corn starch, caprolactam, and glycerol is 30:5:1:3. The stirring speed was 500 r / min, and the stirring time was 30 min.

[0040] The temperatures of zones 1-5 of the twin-screw extruder are 115, 118, 125, 120, and 118°C, respectively, the die head temperature is 114°C, and the screw speed is 150 r / min.

[0041] (2) Mixing: Add the above components to the mixer in sequence and mix them evenly to obtain a mixture; the mixing speed in the mixer is 800 r / min and the mixing time is 35 min; (3) Granulation: The above mixture is added to a twin-screw extruder for melt extrusion granulation to obtain masterbatch; the temperatures of zones 1-5 of the twin-screw extruder are 150, 180, 195, 200, and 205℃, respectively, the die head temperature is 165℃, and the screw speed is 50r / min.

[0042] (4) Blow molding: The masterbatch obtained above is injected into the mold cavity through an injection molding machine, and then blow molded at 175°C using hot air blow molding method, and then annealed at 155°C for 2 hours to obtain an environmentally friendly heat-insulating plastic bottle. Example 3

[0043] A manufacturing process for an environmentally friendly, heat-insulating plastic bottle includes the following steps: (1) Preparation of materials: Weigh the following materials according to their weight parts: 78 parts polylactic acid resin, 38 parts grafted modified bamboo powder composite, 3 parts epoxidized soybean oil, 16 parts calcium carbonate, 10 parts nano silica, 0.5 parts thiopropionate, and 0.8 parts glyceryl monostearate. The plasticizer is: The preparation method of grafted modified bamboo powder is as follows: First, prepare a sodium chloride solution by adding bamboo powder to the sodium chloride solution, adjusting the temperature to 60°C, keeping it in a water bath, and stirring for 30 minutes. Then, add sodium hydroxide solution dropwise to the sodium chloride solution over 10 minutes. Continue stirring for 2 hours after the addition is complete. Then, add maleic anhydride and continue stirring for 3 hours to obtain an intermediate mixture. The intermediate mixture was adjusted to neutral pH to obtain a neutral mixture, which was then filtered and vacuum dried to obtain grafted bamboo powder. Grafted bamboo powder, corn starch, caprolactam, and glycerol were added to a mixer in sequence and mixed evenly to obtain a preliminary mixture. The preliminary mixture was added to a twin-screw extruder for extrusion granulation and cooling to obtain the grafted modified bamboo powder composite.

[0044] The sodium chloride solution has a mass fraction of 1%. The mixing ratio of bamboo powder and sodium chloride solution is 25g:200mL; The volume ratio of sodium chloride solution to sodium hydroxide solution is 5:1; The sodium hydroxide solution has a mass fraction of 5%. The mass ratio of maleic anhydride to bamboo powder is 1:12.

[0045] The vacuum drying temperature is 55℃ and the time is 2 hours.

[0046] The mass ratio of grafted bamboo powder, corn starch, caprolactam, and glycerol is 30:5:1:3. The stirring speed was 500 r / min, and the stirring time was 30 min.

[0047] The temperatures of zones 1-5 of the twin-screw extruder are 115, 118, 125, 120, and 118°C, respectively, the die head temperature is 114°C, and the screw speed is 150 r / min.

[0048] (2) Mixing: Add the above components to the mixer in sequence and mix them evenly to obtain a mixture; the mixing speed in the mixer is 800 r / min and the mixing time is 35 min; (3) Granulation: The above mixture is added to a twin-screw extruder for melt extrusion granulation to obtain masterbatch; the temperatures of zones 1-5 of the twin-screw extruder are 150, 180, 195, 200, and 205℃, respectively, the die head temperature is 165℃, and the screw speed is 50r / min.

[0049] (4) Blow molding: The masterbatch obtained above is injected into the mold cavity through an injection molding machine, and then blow molded at 175°C using hot air blow molding method, and then annealed at 155°C for 2 hours to obtain an environmentally friendly heat-insulating plastic bottle.

[0050] Comparative Example 1: Based on the technical solution of Example 1, the grafted modified bamboo powder composite is replaced with an equal amount of bamboo powder, while the rest of the technical solution remains unchanged.

[0051] Comparative Example 2: Based on the technical solution of Example 1, the grafted modified bamboo powder compound is replaced with an equal amount of corn starch, while the rest of the technical solution remains unchanged.

[0052] Comparative Example 3: Based on the technical solution of Example 1, the grafted modified bamboo powder composite is not added, and the rest of the technical solution remains unchanged.

[0053] test: Tensile strength tests were performed on the examples and comparative examples according to GB / T1040-1992, with each test conducted 5 times and the average value taken. The results are shown in Table 1. Table 1

[0054] As can be seen from Table 1, the product prepared according to the present invention...

[0055] The elongation at break of the specimens from the examples and comparative examples was tested according to GB / T1040.1-2006. Each test was performed 5 times, and the average value was taken. The results are shown in Table 2.

[0056] As can be seen from Table 2, the plastic bottle prepared by the present invention has a high elongation at break.

[0057] Impact strength tests were conducted on the examples and comparative examples according to GB / T1043-1993. Each test was performed 5 times, and the average value was taken. The results are shown in Table 3. Table 3

[0058] As can be seen from Table 3, the plastic bottle prepared by this invention has excellent impact strength.

[0059] Thermal conductivity tests were conducted on the examples and comparative examples according to GB / T3399-1982. Each test was performed 5 times, and the average value was taken. The results are shown in Table 4. Table 4

[0060] As can be seen from Table 4, the plastic bottle prepared by this invention has a low thermal conductivity and good heat insulation performance.

[0061] The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to have equivalent changes, shall be within the protection scope of the present invention as long as they do not exceed the spirit covered by the specification.

Claims

1. An environmentally friendly, heat-insulating plastic bottle, characterized in that, The product comprises, by weight, the following components: 70-78 parts polylactic acid resin, 35-38 parts grafted modified bamboo powder composite, 2-3 parts plasticizer, 12-16 parts inorganic filler, 8-10 parts nano silica, 0.3-0.5 parts antioxidant, and 0.6-0.8 parts lubricant; wherein the plasticizer is epoxidized soybean oil; the inorganic filler is calcium carbonate; the antioxidant is thiopropionate; and the lubricant is glyceryl monostearate. The method for preparing the grafted modified bamboo powder is as follows: First, prepare a sodium chloride solution by adding bamboo powder to the sodium chloride solution, adjusting the temperature to 60°C, keeping it in a water bath, and stirring for 30 minutes. Then, add sodium hydroxide solution dropwise to the sodium chloride solution over 10 minutes. Continue stirring for 2 hours after the addition is complete. Then, add maleic anhydride and continue stirring for 3 hours to obtain an intermediate mixture. The intermediate mixture was adjusted to neutral pH to obtain a neutral mixture, which was then filtered and vacuum dried to obtain grafted bamboo powder. Grafted bamboo powder, corn starch, caprolactam, and glycerol were added to a mixer in sequence and stirred until homogeneous to obtain a preliminary mixture. The mass ratio of grafted bamboo powder, corn starch, caprolactam, and glycerol was 30:5:1:

3. The stirring speed was 500 r / min and the stirring time was 30 min. The preliminary mixture was added to a twin-screw extruder for extrusion granulation and cooling to obtain a grafted modified bamboo powder composite. The sodium chloride solution has a mass fraction of 1%; The mixing ratio of bamboo powder and sodium chloride solution is 22-25g: 200mL; The volume ratio of sodium chloride solution to sodium hydroxide solution is 5:1; The sodium hydroxide solution has a mass fraction of 5%. The mass ratio of maleic anhydride to bamboo powder is 1:10-12.

2. The environmentally friendly heat-insulating plastic bottle according to claim 1, characterized in that: The vacuum drying temperature is 55°C and the time is 2 hours.

3. The environmentally friendly heat-insulating plastic bottle according to claim 1, characterized in that: The temperatures of zones 1-5 of the twin-screw extruder are 115, 118, 125, 120, and 118°C, respectively, the die head temperature is 114°C, and the screw speed is 150 r / min.

4. The manufacturing process of an environmentally friendly heat-insulating plastic bottle according to any one of claims 1-3, characterized in that: Includes the following steps: (1) Preparation of materials: Weigh the following materials according to their weight parts: polylactic acid resin, grafted modified bamboo powder composite, plasticizer, inorganic filler, nano silica, antioxidant, and lubricant; (2) Mixing: Add the above components to the mixer in sequence and mix them evenly to obtain a mixture. (3) Granulation: The above mixture is added to a twin-screw extruder for melt extrusion granulation to obtain masterbatch; (4) Blow molding: The masterbatch obtained above is injected into the mold cavity through an injection molding machine, and then blow molded at 175°C using hot air blow molding method, and then annealed at 155°C for 2 hours to obtain an environmentally friendly heat-insulating plastic bottle.

5. The manufacturing process of an environmentally friendly heat-insulating plastic bottle according to claim 4, characterized in that: In step (2), the mixing speed in the mixer is 800 r / min and the mixing time is 35 min; In step (3), the temperatures of zones 1-5 of the twin-screw extruder are 150, 180, 195, 200, and 205°C, respectively, the die head temperature is 165°C, and the screw speed is 50 r / min.

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