Environment-friendly heat insulation type plastic bottle and preparation process thereof

Abstract

The invention discloses an environment-friendly heat-insulating plastic bottle and a preparation process thereof. The environment-friendly heat-insulating plastic bottle is prepared from the following components: polylactic resin, a graft modified bamboo powder compound, a plasticizer, an inorganic filler, nano silicon dioxide, an antioxidant and a lubricant. The prepared plastic bottle can be biodegraded and has no pollution pressure on the environment, so that the plastic bottle can be used on a large scale and conforms to the current green development theme. The bamboo powder is used as a raw material to prepare the grafting modified bamboo powder compound, the mechanical property of the prepared plastic bottle can be greatly improved, meanwhile, the heat insulation performance of the prepared plastic bottle is improved, and the bamboo powder is used as a natural material, is wide in source, renewable and low in cost, has more economic benefits and is suitable for popularization and application. And the adopted bamboo powder has biodegradability and meets the environmental protection requirement.

Description

Technical Field

[0001] The invention belongs to the technical field of environmentally friendly materials, in particular to an environmentally friendly heat-insulating plastic bottle and a preparation process thereof. Background Art

[0002] Plastic bottles are mainly used to package various liquid or solid products. Plastic bottles are widely used in various fields, including but not limited to: 1. Food and beverage industry: used for packaging drinking water, juice, dairy products, condiments and other foods and beverages.

[0003] 2. Cosmetics industry: used for packaging shampoo, shower gel, skin care products, perfume and other cosmetics.

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

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

[0006] With the continuous improvement of people's environmental awareness and the continuous development of science and technology, the application restrictions on conventional polyethylene plastic bottles are becoming higher and higher. Since polyethylene plastic bottles cannot be degraded in a short time, they will cause large-scale white pollution and impose a heavy burden on the environment.

[0007] In order to reduce environmental pressure, the existing technology begins to use environmentally friendly materials such as polylactic acid to process and prepare plastic bottles. However, the thermal insulation performance of plastic bottles made of pure polylactic acid materials is relatively poor, which limits its application.

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

[0009] The purpose of the present invention is to provide an environmentally friendly heat-insulating plastic bottle to solve the deficiencies in the prior art.

[0010] The technical solution adopted by the present invention is as follows: An environmentally friendly heat-insulating plastic bottle comprises the following ingredients by weight: 70-78 parts of polylactic acid resin, 35-38 parts of grafted modified bamboo powder composite, 2-3 parts of plasticizer, 12-16 parts of inorganic filler, 8-10 parts of nano silicon dioxide, 0.3-0.5 parts of antioxidant and 0.6-0.8 parts of lubricant.

[0011] As a further technical solution: the preparation method of the grafted modified bamboo powder is: First, prepare a sodium chloride solution, add bamboo powder to the sodium chloride solution, adjust the temperature to 60°C, keep warm in a water bath, stir for 30 minutes, then drop sodium hydroxide solution into the sodium chloride solution, after the dropwise addition is completed within 10 minutes, continue stirring for 2 hours, then add maleic anhydride, continue to keep warm and stir for 3 hours, and obtain an intermediate mixture; The pH value of the intermediate mixture is adjusted to neutral to obtain a neutral mixture, and then the mixture is filtered and vacuum dried to obtain grafted bamboo powder; Adding grafted bamboo powder, corn starch, caprolactam and propylene glycol to a mixer in sequence, stirring and mixing evenly to obtain a preliminary mixture; The preliminary mixed material is added into a twin-screw extruder for extrusion granulation and cooled to obtain a grafted modified bamboo powder composite.

[0012] As a further technical solution: the mass fraction of the sodium chloride solution is 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 mass fraction of sodium hydroxide solution is 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° C. and the time is 2 hours.

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

[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 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 stearic acid monoglyceride.

[0018] A preparation process of an environmentally friendly heat-insulating plastic bottle comprises the following steps: (1) Preparation of materials: Weigh the following according to weight: polylactic acid resin, grafted modified bamboo powder composite, plasticizer, inorganic filler, nano-silicon dioxide, antioxidant, and lubricant; (2) Mixing: Add the above components into a mixer in sequence, stir and mix them evenly to obtain a mixed material; (3) Granulation: Add the above-mentioned mixed material into a twin-screw extruder for melt extrusion granulation to obtain masterbatch; (4) Film blowing: The masterbatch obtained above is injected into the mold cavity by an injection molding machine, and then blow-molded by hot air blow molding at 175°C, and then annealed at 155°C for 2h to obtain an environmentally friendly heat-insulating plastic bottle.

[0019] As a further technical solution: in step (2), the stirring speed in the stirrer 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 temperature is 165° C., and the screw speed is 50 r / min. Beneficial Effects

[0020] The plastic bottle prepared by the present invention can be biodegraded and has no pollution pressure on the environment. Therefore, it can be used on a large scale, which is in line with the current green development theme.

[0021] The present invention uses bamboo powder as a 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. In addition, bamboo powder, as a natural material, has a wide source and is renewable, has a low cost, and is more economical. 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 easy to be unevenly dispersed in the plastic bottle system. Therefore, the present invention prepares a grafted modified bamboo powder composite based on bamboo powder, which can further enhance the mechanical properties, thermal stability and other functional properties of the prepared plastic bottle.

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

[0024] The grafted modified bamboo powder composite of the present invention can introduce a functional group or structure with a heat insulation function, which can significantly improve the ultraviolet shielding performance and thermal stability of the manufactured plastic bottle. The grafted modified bamboo powder composite can form a certain barrier layer in the polylactic acid material system, which can reduce the heat transfer path and significantly reduce the thermal conductivity, thereby enabling the plastic bottle to more effectively maintain the internal temperature stability when heated.

[0025] The invention can achieve good interface interaction with polylactic acid through the coordination of the grafted modified bamboo powder composite and nano silicon dioxide, thereby helping to improve the overall performance of the plastic bottle. Moreover, the interaction can reduce defects and gaps at the interface, thereby improving the compactness and heat insulation performance of the plastic bottle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A flow chart for preparing an environmentally friendly, heat-insulating plastic bottle. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The following are specific embodiments Example 1

[0029] A preparation process of an environmentally friendly heat-insulating plastic bottle comprises the following steps: (1) Preparation: Weigh the following materials by weight: 70 parts of polylactic acid resin, 35 parts of grafted modified bamboo powder composite, 2 parts of epoxidized soybean oil, 12 parts of calcium carbonate, 8 parts of nano-silicon dioxide, 0.3 parts of thiopropionate, and 0.6 parts of stearic acid monoglyceride. The plasticizer is; The preparation method of grafted modified bamboo powder is as follows: First, prepare a sodium chloride solution, add bamboo powder to the sodium chloride solution, adjust the temperature to 60°C, keep warm in a water bath, stir for 30 minutes, then drop sodium hydroxide solution into the sodium chloride solution, after the dropwise addition is completed within 10 minutes, continue stirring for 2 hours, then add maleic anhydride, continue to keep warm and stir for 3 hours, and obtain an intermediate mixture; The pH value of the intermediate mixture is adjusted to neutral to obtain a neutral mixture, and then the mixture is filtered and vacuum dried to obtain grafted bamboo powder; Adding grafted bamboo powder, corn starch, caprolactam and propylene glycol to a mixer in sequence, stirring and mixing evenly to obtain a preliminary mixture; The preliminary mixed material is added into a twin-screw extruder for extrusion granulation and cooled to obtain a grafted modified bamboo powder composite.

[0030] The mass fraction of sodium chloride solution is 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 mass fraction of sodium hydroxide solution is 5%; The mass ratio of maleic anhydride to bamboo powder is 1:10.

[0031] The vacuum drying temperature was 55°C and the time was 2 hours.

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

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

[0034] (2) Mixing: Add the above components into a mixer in sequence, stir and mix them evenly to obtain a mixed material; the stirring speed in the mixer is 800 r / min, and the stirring time is 35 min; (3) Granulation: Add the above-mentioned mixed material into 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°C, respectively; the die temperature is 165°C; and the screw speed is 50 r / min.

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

[0036] A preparation process of an environmentally friendly heat-insulating plastic bottle comprises the following steps: (1) Preparation: Weigh the following materials by weight: 72 parts of polylactic acid resin, 36 parts of grafted modified bamboo powder composite, 2.5 parts of epoxidized soybean oil, 15 parts of calcium carbonate, 9 parts of nano-silicon dioxide, 0.4 parts of thiopropionate, and 0.7 parts of stearic acid monoglyceride. The plasticizer is; The preparation method of grafted modified bamboo powder is as follows: First, prepare a sodium chloride solution, add bamboo powder to the sodium chloride solution, adjust the temperature to 60°C, keep warm in a water bath, stir for 30 minutes, then drop sodium hydroxide solution into the sodium chloride solution, after the dropwise addition is completed within 10 minutes, continue stirring for 2 hours, then add maleic anhydride, continue to keep warm and stir for 3 hours, and obtain an intermediate mixture; The pH value of the intermediate mixture is adjusted to neutral to obtain a neutral mixture, and then the mixture is filtered and vacuum dried to obtain grafted bamboo powder; Adding grafted bamboo powder, corn starch, caprolactam and propylene glycol to a mixer in sequence, stirring and mixing evenly to obtain a preliminary mixture; The preliminary mixed material is added into a twin-screw extruder for extrusion granulation and cooled to obtain a grafted modified bamboo powder composite.

[0037] The mass fraction of sodium chloride solution is 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 mass fraction of sodium hydroxide solution is 5%; The mass ratio of maleic anhydride to bamboo powder is 1:11.

[0038] The vacuum drying temperature was 55°C and the time was 2 hours.

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

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

[0041] (2) Mixing: Add the above components into a mixer in sequence, stir and mix them evenly to obtain a mixed material; the stirring speed in the mixer is 800 r / min, and the stirring time is 35 min; (3) Granulation: Add the above-mentioned mixed material into 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°C, respectively; the die temperature is 165°C; and the screw speed is 50 r / min.

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

[0043] A preparation process of an environmentally friendly heat-insulating plastic bottle comprises the following steps: (1) Preparation: Weigh the following materials by weight: 78 parts of polylactic acid resin, 38 parts of grafted modified bamboo powder composite, 3 parts of epoxidized soybean oil, 16 parts of calcium carbonate, 10 parts of nano-silicon dioxide, 0.5 parts of thiopropionate, and 0.8 parts of stearic acid monoglyceride. The plasticizer is; The preparation method of grafted modified bamboo powder is as follows: First, prepare a sodium chloride solution, add bamboo powder to the sodium chloride solution, adjust the temperature to 60°C, keep warm in a water bath, stir for 30 minutes, then drop sodium hydroxide solution into the sodium chloride solution, after the dropwise addition is completed within 10 minutes, continue stirring for 2 hours, then add maleic anhydride, continue to keep warm and stir for 3 hours, and obtain an intermediate mixture; The pH value of the intermediate mixture is adjusted to neutral to obtain a neutral mixture, and then the mixture is filtered and vacuum dried to obtain grafted bamboo powder; Adding grafted bamboo powder, corn starch, caprolactam and glycerol into a mixer in sequence, stirring and mixing evenly to obtain a preliminary mixture; The preliminary mixed material is added into a twin-screw extruder for extrusion granulation and cooled to obtain a grafted modified bamboo powder composite.

[0044] The mass fraction of sodium chloride solution is 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 mass fraction of sodium hydroxide solution is 5%; The mass ratio of maleic anhydride to bamboo powder is 1:12.

[0045] The vacuum drying temperature was 55°C and the time was 2 hours.

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

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

[0048] (2) Mixing: Add the above components into a mixer in sequence, stir and mix them evenly to obtain a mixed material; the stirring speed in the mixer is 800 r / min, and the stirring time is 35 min; (3) Granulation: Add the above-mentioned mixed material into 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°C, respectively; the die temperature is 165°C; and the screw speed is 50 r / min.

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

[0050] Comparative Example 1: On the basis of the technical solution of Example 1, the grafted modified bamboo powder composite was replaced with an equal amount of bamboo powder, and the rest of the technical solutions remained unchanged.

[0051] Comparative Example 2: On the basis of the technical solution of Example 1, the grafted modified bamboo powder composite was replaced with an equal amount of corn starch, and the rest of the technical solutions remained unchanged.

[0052] Comparative Example 3: On the basis of the technical solution of Example 1, the grafted modified bamboo powder composite is not added, and the rest of the technical solutions remain unchanged.

[0053] test: The tensile strength test of the embodiment and the comparative example was carried out according to GB / T1040-1992, each test was performed 5 times, and the average value was taken. The results are shown in Table 1: Table 1

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

[0055] The elongation at break of the samples of the embodiment and the comparative example was tested with reference to GB / T1040.1-2006, and each test was performed 5 times, and the average value was taken. The results are shown in Table 2:

[0056] It can be seen from Table 2 that the plastic bottle prepared by the present invention has a higher elongation at break.

[0057] The impact strength test of the embodiment and the comparative example was carried out 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] It can be seen from Table 3 that the plastic bottle prepared by the present invention has excellent impact strength.

[0059] The thermal conductivity of the embodiment and the comparative example was tested according to GB / T3399-1982, and each test was repeated 5 times to obtain the average value. The results are shown in Table 4: Table 4

[0060] It can be seen from Table 4 that the plastic bottle prepared by the present invention has a lower thermal conductivity and better thermal 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 modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification, should be within the protection scope of the present invention.

Claims

1. An environmentally friendly heat-insulating plastic bottle, characterized in that: The invention comprises the following ingredients by weight: 70-78 parts of polylactic acid resin, 35-38 parts of grafted modified bamboo powder composite, 2-3 parts of plasticizer, 12-16 parts of inorganic filler, 8-10 parts of nano silicon dioxide, 0.3-0.5 parts of antioxidant and 0.6-0.8 parts of lubricant.

2. The environmentally friendly heat-insulating plastic bottle according to claim 1, characterized in that: The preparation method of the grafted modified bamboo powder is as follows: First, prepare a sodium chloride solution, add bamboo powder to the sodium chloride solution, adjust the temperature to 60°C, keep warm in a water bath, stir for 30 minutes, then drop sodium hydroxide solution into the sodium chloride solution, after the dropwise addition is completed within 10 minutes, continue stirring for 2 hours, then add maleic anhydride, continue to keep warm and stir for 3 hours, and obtain an intermediate mixture; The pH value of the intermediate mixture is adjusted to neutral to obtain a neutral mixture, and then the mixture is filtered and vacuum dried to obtain grafted bamboo powder; Adding grafted bamboo powder, corn starch, caprolactam and propylene glycol to a mixer in sequence, stirring and mixing evenly to obtain a preliminary mixture; The preliminary mixed material is added into a twin-screw extruder for extrusion granulation and cooled to obtain a grafted modified bamboo powder composite.

3. The environmentally friendly heat-insulating plastic bottle according to claim 2, characterized in that: The mass fraction of the sodium chloride solution is 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 mass fraction of sodium hydroxide solution is 5%; The mass ratio of maleic anhydride to bamboo powder is 1:10-12.

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

5. The environmentally friendly heat-insulating plastic bottle according to claim 2, characterized in that: The grafted bamboo powder, corn starch, caprolactam and glycerol are mixed in a mass ratio of 30:5:1:3; The stirring speed is 500r / min and the time is 30min.

6. The environmentally friendly heat-insulating plastic bottle according to claim 2, characterized in that: The temperatures of zones 1-5 of the twin-screw extruder are 115, 118, 125, 120, 118°C, respectively; the die temperature is 114°C; and the screw speed is 150r / min.

7. The environmentally friendly heat-insulating plastic bottle according to claim 1, characterized in that: The plasticizer is epoxidized soybean oil; The inorganic filler is calcium carbonate.

8. The process for preparing an environmentally friendly heat-insulating plastic bottle according to claim 1, characterized in that: The antioxidant is thiopropionate; The lubricant is stearic acid monoglyceride.

9. A process for preparing an environmentally friendly heat-insulating plastic bottle according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Preparation of materials: Weigh the following according to weight: polylactic acid resin, grafted modified bamboo powder composite, plasticizer, inorganic filler, nano-silicon dioxide, antioxidant, and lubricant; (2) Mixing: Add the above components into a mixer in sequence, stir and mix them evenly to obtain a mixed material; (3) Granulation: Add the above-mentioned mixed material into a twin-screw extruder for melt extrusion granulation to obtain masterbatch; (4) Film blowing: The masterbatch obtained above is injected into the mold cavity by an injection molding machine, and then blow-molded by hot air blow molding at 175°C, and then annealed at 155°C for 2h to obtain an environmentally friendly heat-insulating plastic bottle.

10. The process for preparing an environmentally friendly heat-insulating plastic bottle according to claim 8, characterized in that: 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 temperature is 165° C., and the screw speed is 50 r / min.

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