A logistics packaging box based on functional plastics and its manufacturing process

Abstract

The present invention discloses a logistics packaging box based on functional plastics and a manufacturing process thereof, and relates to the technical field of functional plastics. The manufacturing process of the logistics packaging box based on functional plastics of the present invention comprises the following steps: putting the functional plastic into an injection molding machine for injection molding to obtain a logistics packaging box; the preparation method of the functional plastic comprises the following steps: blending polypropylene, an additive, white carbon black, a plasticizer, a light stabilizer, and a lubricant to obtain a mixture; putting the mixture into a twin-screw extruder for extrusion and granulation to obtain a functional plastic; the additive prepared in the present application is added to the functional plastic to effectively improve the low-temperature toughness of the material.

Description

Technical Field

[0001] The present invention relates to the technical field of functional plastics, and in particular to a logistics packaging box based on functional plastics and a manufacturing process thereof. Background Art

[0002] Plastic packaging boxes for logistics are used as outer packaging boxes for short-distance transportation of parts or semi-finished products between workshops and factories, replacing traditional wooden boxes and cartons. Traditional wooden boxes need to be unloaded by manpower during the circulation process. Wooden turnover boxes are heavy, expensive, unstable in performance, and waste a lot of wood resources. Although cartons are cheap, they have low compressive strength during transportation, limited stacking height, and are easily affected by moisture, which is not conducive to sales. Plastic packaging boxes are a kind of rigid packaging container made of various rigid plastics as raw materials. Plastic packaging boxes are loved by the majority of users because of their lightness, acid and alkali resistance, corrosion resistance, water resistance, collision resistance and durability, and have become an indispensable and important packaging product in people's daily life. Plastic packaging boxes for logistics are widely used in the national defense industry, transportation industry, electromechanical products, building materials, agriculture, science, education, health and daily life.

[0003] Polypropylene is one of the five major general-purpose plastics. It has the characteristics of low price, easy processing and molding, and excellent comprehensive product performance. However, polypropylene materials have large molding shrinkage, high brittleness, and low notched impact strength, especially at low temperatures, which restricts the further promotion of polypropylene materials. Hard plastic materials prepared with polypropylene as the base material have the following problems: (1) poor low-temperature drop resistance; (2) low stacking strength due to insufficient mechanical strength and heat resistance; (3) poor resistance to environmental stress cracking. Summary of the invention

[0004] The purpose of the present invention is to provide a logistics packaging box based on functional plastics and a manufacturing process thereof to solve the following technical problems:

[0005] Existing polypropylene materials have defects such as poor impact resistance and brittle fracture at low temperatures.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A manufacturing process of a logistics packaging box based on functional plastics comprises the following steps: injecting the functional plastic into an injection molding machine for injection molding to obtain a logistics packaging box;

[0008] The preparation method of the functional plastic comprises the following steps: blending polypropylene, additive, white carbon black, plasticizer, light stabilizer and lubricant to obtain a mixture; extruding and granulating the mixture in a twin-screw extruder to obtain the functional plastic;

[0009] The preparation method of the admixture comprises the following steps:

[0010] S1: Add nano calcium carbonate, deionized water and anhydrous ethanol into a reaction kettle and disperse them evenly, add γ-(methacryloyloxy)propyltrimethoxysilane, control the temperature at 70-80°C, keep warm and stir for 1-3h, filter and dry to obtain component 1;

[0011] S2: In a nitrogen atmosphere, add component 1, N,N-dimethylformamide, azobisisobutyronitrile and glycidyl methacrylate into a reaction kettle, control the temperature at 65-75°C, keep the reaction for 18-21 hours, filter and dry to obtain component 2;

[0012] S3: Add component three, sodium chloroacetate and cyclohexane into a reaction kettle, control the temperature at 90-100°C, add sodium hydroxide solution, keep the temperature for 6-9 hours, wash with anhydrous ethanol, and dry to obtain an admixture.

[0013] As a further solution of the present invention: the addition ratio of nano calcium carbonate, deionized water, anhydrous ethanol, and γ-(methacryloyloxy)propyltrimethoxysilane in S1 is 10 g: 30-60 mL: 10-20 mL: 2-5 g.

[0014] As a further solution of the present invention: the addition ratio of component 1, N,N-dimethylformamide, azobisisobutyronitrile, and glycidyl methacrylate in S2 is 10 g: 50-100 mL: 0.4-0.8 g: 15-30 mL.

[0015] As a further solution of the present invention: the sodium hydroxide solution in S3 is a 40-50wt% sodium hydroxide aqueous solution, and the addition ratio of component three, sodium chloroacetate, cyclohexane, and sodium hydroxide solution is 10g:5-8g:15-20mL:6-10mL.

[0016] As a further solution of the present invention: the mixture includes the following raw materials in weight percentage: 70-80% polypropylene, 10-20% additive, 1-5% white carbon black, 3-5% plasticizer, 1-3% lubricant, 1-2% light stabilizer, and the sum of the weight percentages of the raw materials is 100%.

[0017] As a further solution of the present invention: the plasticizer is glycerin, and the lubricant is paraffin.

[0018] As a further embodiment of the present invention: the light stabilizer is any one of 2-(2'-hydroxy-3',5'-dicyclopentylphenyl)benzotriazole and 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole.

[0019] As a further solution of the present invention: the twin-screw extruder is set at a temperature of 220-230° C. and a screw speed of 200-500 rpm.

[0020] A logistics packaging box based on functional plastics is made by any one of the above preparation methods.

[0021] Beneficial effects of the present invention:

[0022] The present application utilizes γ-(methacryloyloxy)propyltrimethoxysilane to perform surface treatment on calcium carbonate. γ-(methacryloyloxy)propyltrimethoxysilane can bond with -OH groups on the surface of calcium carbonate, thereby forming an organic layer composed of silicate molecules on the surface of calcium carbonate, improving the affinity between calcium carbonate ions and polymers, and obtaining component one; then, the carbon-carbon double bonds grafted on the surface of component one are copolymerized and grafted with monomer glycidyl methacrylate to obtain component two; then, sodium chloroacetate is used to perform a ring-opening reaction with epoxy groups on the surface of component two to obtain an additive; the present application modifies calcium carbonate, improves the interface adhesion between calcium carbonate and polypropylene, and buffers the shrinkage stress generated during the molding and cooling process of the material, thereby having a good toughening effect.

[0023] The organic layer coated on the surface of the additive prepared in the present application adds a flexible mechanical action layer on the surface of calcium carbonate, which not only effectively improves the low-temperature toughness of polypropylene, but also generates physical entanglement between the alkyl carboxylate molecular chain on the surface of calcium carbonate and polypropylene, thereby increasing the free volume of polypropylene near the surface of calcium carbonate, making it easy for polypropylene to produce shear yield or plastic deformation, absorb impact energy, and improve the impact strength of the material. The additive prepared in the present application effectively entangles with the polypropylene molecular chain, thereby significantly improving its low-temperature impact toughness. DETAILED DESCRIPTION

[0024] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0025] Example 1

[0026] The preparation method of the admixture comprises the following steps:

[0027] S1: 10 g of nano calcium carbonate, 30 mL of deionized water and 10 mL of anhydrous ethanol were added to a reaction kettle and dispersed evenly, 2 g of γ-(methacryloyloxy)propyltrimethoxysilane was added, the temperature was controlled at 70°C, the mixture was stirred for 1 h, filtered and dried to obtain component 1;

[0028] S2: In a nitrogen atmosphere, 10 g of component 1, 50 mL of N,N-dimethylformamide, 0.4 g of azobisisobutyronitrile, and 15 mL of glycidyl methacrylate were added to a reaction kettle, the temperature was controlled at 65°C, the reaction was kept warm for 18 h, and then filtered and dried to obtain component 2;

[0029] S3: Add 10g of component three, 5g of sodium chloroacetate and 15mL of cyclohexane into a reaction kettle, control the temperature at 90°C, add 6mL of 40wt% sodium hydroxide aqueous solution, keep the temperature for 6h, wash with anhydrous ethanol and dry to obtain an admixture.

[0030] Example 2

[0031] The preparation method of the admixture comprises the following steps:

[0032] S1: 10 g of nano calcium carbonate, 45 mL of deionized water and 15 mL of anhydrous ethanol were added to a reaction kettle and dispersed evenly, 3 g of γ-(methacryloyloxy)propyltrimethoxysilane was added, the temperature was controlled at 75°C, the mixture was stirred for 2 h, filtered and dried to obtain component 1;

[0033] S2: In a nitrogen atmosphere, 10 g of component 1, 70 mL of N,N-dimethylformamide, 0.6 g of azobisisobutyronitrile, and 20 mL of glycidyl methacrylate were added to a reaction kettle, the temperature was controlled at 70°C, the reaction was kept warm for 18 hours, and then filtered and dried to obtain component 2;

[0034] S3: Add 10g of component three, 6g of sodium chloroacetate and 15mL of cyclohexane into a reaction kettle, control the temperature at 95°C, add 8mL of 40wt% sodium hydroxide aqueous solution, keep the temperature for 9h, wash with anhydrous ethanol and dry to obtain an admixture.

[0035] Example 3

[0036] The preparation method of the admixture comprises the following steps:

[0037] S1: 10 g of nano calcium carbonate, 60 mL of deionized water and 20 mL of anhydrous ethanol were added to a reaction kettle and dispersed evenly, 5 g of γ-(methacryloyloxy)propyltrimethoxysilane was added, the temperature was controlled at 80°C, the mixture was stirred for 3 h, filtered and dried to obtain component 1;

[0038] S2: In a nitrogen atmosphere, 10 g of component 1, 100 mL of N,N-dimethylformamide, 0.8 g of azobisisobutyronitrile, and 30 mL of glycidyl methacrylate were added to a reaction kettle, the temperature was controlled at 75°C, the reaction was kept warm for 21 hours, and then filtered and dried to obtain component 2;

[0039] S3: Add 10 g of component three, 8 g of sodium chloroacetate and 20 mL of cyclohexane into a reaction kettle, control the temperature at 100° C., add 10 mL of 50 wt % sodium hydroxide aqueous solution, keep the temperature for 9 h, wash with anhydrous ethanol and dry to obtain an admixture.

[0040] Example 4

[0041] A manufacturing process of a logistics packaging box based on functional plastics comprises the following steps:

[0042] A1: 75g polypropylene (produced by Beijing Yanshan Petrochemical Company, grade 1300, melt index of 1.2g / 10min, density of 0.91g / cm 3 ), 16g of the additive prepared in Example 1, 3.5g of glycerol, 3g of white carbon black, 1g of 2-(2'-hydroxy 3', 5'-bis(cyclopentylphenyl)phenyl)benzotriazole, and 1.5g of paraffin are blended to obtain a mixture; the mixture is put into a twin-screw extruder for extrusion and granulation, the twin-screw extruder is set at a temperature of 220°C and a screw speed of 300rpm to obtain a functional plastic;

[0043] A2: Put the functional plastic into an injection molding machine for injection molding to obtain a logistics packaging box.

[0044] Example 5

[0045] Compared with Example 4, Example 5 is a method in which only an equal amount of the admixture prepared in Example 1 added in Example 4 is replaced by an admixture prepared in Example 2, and the remaining components and preparation method are completely consistent with those of Example 4.

[0046] Example 6

[0047] Compared with Example 4, Example 6 is a method in which only an equal amount of the admixture prepared in Example 1 added in Example 4 is replaced by an admixture prepared in Example 3, and the remaining components and preparation method are completely consistent with those of Example 4.

[0048] Comparative Example 1

[0049] The preparation method of the admixture comprises the following steps:

[0050] 10 g of nano calcium carbonate, 45 mL of deionized water and 15 mL of anhydrous ethanol were added into a reaction kettle and dispersed evenly. 3 g of γ-(methacryloyloxy)propyltrimethoxysilane was added. The temperature was controlled at 75° C. and stirred for 2 h. The mixture was filtered and dried to obtain an admixture.

[0051] Comparative Example 2

[0052] The preparation method of the admixture comprises the following steps:

[0053] S1: 10 g of nano calcium carbonate, 45 mL of deionized water and 15 mL of anhydrous ethanol were added to a reaction kettle and dispersed evenly, 3 g of γ-(methacryloyloxy)propyltrimethoxysilane was added, the temperature was controlled at 75°C, the mixture was stirred for 2 h, filtered and dried to obtain component 1;

[0054] S2: In a nitrogen atmosphere, 10 g of component 1, 70 mL of N,N-dimethylformamide, 0.6 g of azobisisobutyronitrile, and 20 mL of glycidyl methacrylate were added to a reaction kettle, the temperature was controlled at 70°C, the reaction was kept warm for 18 hours, and then filtered and dried to obtain an admixture.

[0055] Comparative Example 3

[0056] Compared with Example 4, Comparative Example 3 is that only the admixture prepared in Example 1 added in Example 4 is replaced by the admixture prepared in Comparative Example 1 in an equal amount, and the other components and preparation method are completely consistent with Example 4.

[0057] Comparative Example 4

[0058] Compared with Example 4, Comparative Example 3 is that only the admixture prepared in Example 1 added in Example 4 is replaced by the admixture prepared in Comparative Example 2 in equal amount, and the other components and preparation method are completely consistent with Example 4.

[0059] Performance Testing

[0060] (1) Vertical impact drop test: The test is carried out in accordance with GB / T 4857.5 "Vertical impact drop test method for packaging and transport packages", with a drop height of 0.9m. The test results are shown in Table 1;

[0061] (2) Sine constant frequency vertical vibration test: The test is carried out in accordance with GB / T 4857.7 "Sine constant frequency vertical vibration test method for packaging and transport packages", with a vibration frequency of 3-5 Hz and an acceleration of 9.8 m / s 2 , test time 2h, load 250kg, test results are shown in Table 1;

[0062] (3) Pressure test: The test was conducted in accordance with GB / T 4857.4 “Pressure test method for packaging and transport packages”, with a test pressure of 25 kN. The test results are shown in Table 1.

[0063] (4) Low temperature vertical impact drop test: The test is carried out in accordance with GB / T 4857.5 "Vertical impact drop test method for packaging and transport packages". After being placed at -40°C for 24 hours, the vertical impact drop test is immediately carried out with a drop height of 0.45m. The test results are shown in Table 1;

[0064] Table 1: Performance test of Examples 4-6 and Comparative Examples 3-4

[0065]

[0066] (5) Tensile strength: tested according to GB / T 1040-2006 “Test method for tensile properties of plastics”, with sample size of 100 mm × 10 mm × 1 mm, gauge length of 50 mm, and tensile speed of 20 mm / min. The test results are shown in Table 2.

[0067] (6) Impact strength: tested according to GB / T 1043-1993 “Rigid Plastics Simply Supported Beam Impact Test Method”, the sample size is 100 mm × 10 mm × 1 mm, the test results are shown in Table 2;

[0068] Table 2: Mechanical properties test of Examples 4-6 and Comparative Examples 3-4

[0069]

[0070] It can be seen from Table 1-2 that the functional plastic prepared in this application has excellent mechanical properties and is suitable for the field of logistics packaging boxes.

[0071] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A process for manufacturing a logistics packaging box based on functional plastics, characterized in that: The method comprises the following steps: injecting functional plastic into an injection molding machine for injection molding to obtain a packaging box for logistics; The preparation method of the functional plastic comprises the following steps: blending polypropylene, additives, white carbon black, plasticizer, light stabilizer and lubricant to obtain a mixture; extruding and granulating the mixture in a twin-screw extruder to obtain the functional plastic; The preparation method of the admixture comprises the following steps: S1: Add nano calcium carbonate, deionized water and anhydrous ethanol into a reaction kettle and disperse them evenly, add γ-(methacryloyloxy)propyltrimethoxysilane, control the temperature at 70-80°C, keep warm and stir for 1-3h, filter and dry to obtain component 1; S2: In a nitrogen atmosphere, add component 1, N,N-dimethylformamide, azobisisobutyronitrile and glycidyl methacrylate into a reaction kettle, control the temperature at 65-75°C, keep the reaction for 18-21 hours, filter and dry to obtain component 2; S3: Add component 2, sodium chloroacetate and cyclohexane into a reaction kettle, control the temperature at 90-100°C, add sodium hydroxide solution, keep the temperature for 6-9 hours, wash with anhydrous ethanol, and dry to obtain an admixture.

2. The manufacturing process of a logistics packaging box based on functional plastic according to claim 1 is characterized in that: The addition ratio of nano calcium carbonate, deionized water, anhydrous ethanol, and γ-(methacryloyloxy)propyltrimethoxysilane in S1 is 10 g: 30-60 mL: 10-20 mL: 2-5 g.

3. The manufacturing process of a logistics packaging box based on functional plastics according to claim 1 is characterized in that: The addition ratio of component 1, N,N-dimethylformamide, azobisisobutyronitrile, and glycidyl methacrylate in S2 is 10g:50-100mL:0.4-0.8g:15-30mL.

4. The manufacturing process of a logistics packaging box based on functional plastics according to claim 1 is characterized in that: The sodium hydroxide solution in S3 is a 40-50wt% sodium hydroxide aqueous solution, and the addition ratio of component 2, sodium chloroacetate, cyclohexane, and sodium hydroxide solution is 10g: 5-8g: 15-20mL: 6-10mL.

5. The manufacturing process of a logistics packaging box based on functional plastics according to claim 1 is characterized in that: The mixture includes the following raw materials in weight percentage: 70-80% polypropylene, 10-20% additive, 1-5% white carbon black, 3-5% plasticizer, 1-3% lubricant, 1-2% light stabilizer, and the sum of the weight percentages of the raw materials is 100%.

6. The manufacturing process of a logistics packaging box based on functional plastics according to claim 1 is characterized in that: The plasticizer is glycerin, and the lubricant is paraffin.

7. The manufacturing process of a logistics packaging box based on functional plastics according to claim 1 is characterized in that: The light stabilizer is any one of 2-(2'-hydroxy-3',5'-dicyclopentylphenyl)benzotriazole and 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole.

8. The manufacturing process of a logistics packaging box based on functional plastics according to claim 1 is characterized in that: The twin-screw extruder was set at a temperature of 220-230°C and a screw speed of 200-500 rpm.

9. A logistics packaging box based on functional plastics, characterized in that: Made by the manufacturing process described in any one of claims 1-8.

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