A green and degradable packaging box material for logistics and preparation method thereof

Abstract

The invention relates to the technical field of packaging box materials, and discloses a green and degradable packaging box material for logistics and a preparation method thereof. The packaging box material comprises the following raw materials: polylactic acid, polycaprolactone, a composite reinforcing agent, a wear-resistant filler, a plasticizer, a lubricant, and an antioxidant; wherein the composite reinforcing agent is prepared by grafting styrene-butadiene rubber onto the surface of bamboo fiber, thereby improving the mechanical properties and toughness of the packaging box material; the wear-resistant filler is prepared by combining halloysite nanotubes with hollow glass microspheres, thereby producing a "ball bearing" effect in the packaging box material, thereby improving the wear resistance of the packaging box material, effectively protecting the safety of internal items during transportation, and meeting the requirements of green, environmental protection and sustainable development, and being able to meet the requirements of the modern logistics industry for packaging box materials.

Description

Technical Field

[0001] The invention relates to the technical field of packaging box materials, and in particular to a green and degradable packaging box material for logistics and a preparation method thereof. Background Art

[0002] With the rapid development of the logistics industry, the use of packaging materials has increased dramatically. However, traditional packaging materials are often difficult to degrade after use, causing serious pollution to the environment. In order to solve this problem, green degradable packaging materials have emerged. This material is made of biodegradable raw materials and has the ability to decompose quickly in the natural environment without causing negative impacts on the environment, thus meeting the urgent needs of modern society for green and sustainable development. Among the many biodegradable raw materials, polylactic acid has good plasticity, moisture resistance, transparency and other advantages. It is used as the base material of packaging materials. On this basis, other functional additives are added to modify the base material to prepare high-performance packaging materials.

[0003] In practical applications, the mechanical properties of packaging box materials made with polylactic acid as the base material are poor. During transportation, the items in the packaging box may be subjected to various external forces such as collision, extrusion, and vibration. If the mechanical properties of the packaging box material are poor, it will be difficult to effectively resist these external forces, and deformation, breakage, and other problems may easily occur, resulting in damage or loss of items. In addition, its wear resistance is poor. During transportation, the packaging box often needs to undergo multiple handling, loading and unloading, and transportation. These operations are likely to cause wear on the surface of the packaging box and shorten its service life. Therefore, it is very important to improve the mechanical properties and wear resistance of the packaging box material, which can not only ensure the quality and safety of the items, but also reduce losses and disputes during the logistics process.

[0004] The patent with publication number CN103992518B discloses a biodegradable packaging material. The invention adds raw and auxiliary materials such as octyl succinate starch ester, polycaprolactone, xylan, etc., and utilizes the advantages of each raw and auxiliary material to make the prepared packaging material have good waterproofness, tensile properties, degradability, toughness and strength. Therefore, by adding other functional additives to the matrix, its functionality can be enriched to promote its further development and application. Summary of the invention

[0005] The purpose of the present invention is to provide a green and degradable packaging box material for logistics and a preparation method thereof, which solves the following technical problems:

[0006] (1) Solved the problem of poor mechanical properties of packaging box materials;

[0007] (2) The problem of poor wear resistance of packaging box materials has been solved.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A green and degradable packaging box material for logistics includes the following raw materials in parts by weight: 20 to 40 parts of polylactic acid, 10 to 30 parts of polycaprolactone, 4 to 6 parts of composite reinforcing agent, 8 to 10 parts of wear-resistant filler, 2 to 3 parts of plasticizer, 1 to 2 parts of lubricant, and 0.5 to 1.5 parts of antioxidant.

[0010] Furthermore, the preparation method of the composite reinforcing agent comprises the following steps:

[0011] S1: adding bamboo fiber and potassium hydroxide solution into a reactor, and then placing it in a constant temperature oscillator, oscillating it at a temperature of 40-50° C. and a rotation speed of 100-200 r / min for 0.5-1.5 h, then washing it with ionized water, filtering it, and drying it to obtain pretreated bamboo fiber;

[0012] S2: placing the pretreated bamboo fiber in toluene, ultrasonically dispersing for 20 to 40 minutes, passing nitrogen protection, then adding thioglycolic acid and a catalyst, stirring evenly, raising the system temperature to 90 to 110°C, heat preservation for 5 to 7 hours, cooling and discharging, and obtaining modified bamboo fiber;

[0013] S3: Add modified bamboo fiber, styrene-butadiene rubber and cyclohexane into a reactor, stir mechanically to mix them thoroughly, evaporate the solvent, dry to obtain a masterbatch, mix the masterbatch with diphenylguanidine, and then pour into a torque rheometer, set the temperature in the torque rheometer to 130-150°C, mix at a speed of 40-60r / min for 10-20min, take out the product, and obtain a composite reinforcing agent.

[0014] Furthermore, in step S1, the bamboo fiber has a diameter of 1 to 10 μm and a length of 1 to 3 mm.

[0015] Furthermore, in step S1, the mass fraction of the potassium hydroxide solution is 10% to 40%.

[0016] Furthermore, in step S2, the catalyst is any one of aminosulfonic acid, trifluoromethanesulfonic acid or p-toluenesulfonic acid.

[0017] Through the above technical scheme, the bamboo fiber is treated with potassium hydroxide solution to remove surface impurities to obtain pretreated bamboo fiber. Under the action of a catalyst, the hydroxyl groups on the surface of the pretreated bamboo fiber can react with the carboxyl groups in the thioglycolic acid structure to modify the thiol groups on the surface of the bamboo fiber to obtain modified bamboo fiber. The styrene-butadiene rubber is grafted on the surface of the bamboo fiber through a heat-induced "thiol-ene" click chemistry reaction to obtain a composite reinforcing agent.

[0018] Furthermore, the preparation method of the wear-resistant filler comprises the following steps:

[0019] Ⅰ: Place the hollow glass microspheres in the chamber of the plasma treatment instrument, turn on the power, turn on the vacuum pump, and when the vacuum degree in the chamber reaches 8-10Pa, open the flow valve to let in oxygen to activate the hollow glass microspheres to obtain pretreated hollow glass microspheres;

[0020] II: Pretreated hollow glass microspheres and halloysite nanotubes are dispersed in dimethyl sulfoxide to form a uniform suspension, and then diacyl chloride monomer and accelerator are added to the suspension, stirred and mixed evenly, stirred at room temperature for 4 to 6 hours, and then filtered to collect solid materials to obtain wear-resistant filler.

[0021] Furthermore, in step II, the length of the halloysite nanotube is 5 to 10 μm, and the diameter is 50 to 800 nm.

[0022] Furthermore, in step II, the diacyl chloride monomer is any one of succinyl chloride, glutaryl chloride or adipoyl chloride.

[0023] Furthermore, in step II, the promoter is any one of sodium carbonate, potassium carbonate or sodium bicarbonate.

[0024] Through the above technical scheme, the hollow glass microspheres are plasma treated, and hydroxyl groups are introduced on the surface of the hollow glass microspheres. Under the action of a promoter, the acyl chloride group at one end of the diacyl chloride monomer structure can react with the hydroxyl groups on the surface of the hollow glass microspheres, and the acyl chloride groups are modified on the surface of the hollow glass microspheres. The surface of the halloysite nanotubes is rich in hydroxyl groups. The high reactivity of the acyl chloride groups can be used to further react with the hydroxyl groups on the surface of the halloysite nanotubes under the action of a promoter, thereby combining the halloysite nanotubes with the hollow glass microspheres to obtain a wear-resistant filler.

[0025] A method for preparing a green and degradable packaging box material for logistics, comprising the following steps:

[0026] (1) placing polylactic acid, polycaprolactone, a composite reinforcing agent, a wear-resistant filler, a plasticizer, a lubricant, and an antioxidant in a high-speed mixer and mixing for 10 to 20 minutes to obtain a premix;

[0027] (2) placing the premix obtained in step (1) in a screw extruder at a temperature of 140 to 160° C., plasticizing and melting the premix to form a mixed material, and then extruding the mixed material through a corresponding die and a pelletizer to form a masterbatch, and then molding the masterbatch to obtain a packaging box material.

[0028] Beneficial effects of the present invention:

[0029] (1) The present invention prepares bamboo fiber modified with styrene-butadiene rubber as a composite reinforcing agent. After being organically modified, the bamboo fiber can be evenly dispersed in the matrix and is not prone to agglomeration. On the one hand, the advantages of bamboo fiber are utilized to improve the mechanical properties of the packaging box material, thereby avoiding problems such as damage, loss or pollution of goods due to damage or deformation of the packaging box during the logistics process. On the other hand, the styrene-butadiene rubber grafted on the surface of the bamboo fiber can improve the toughness of the packaging box material, so that the packaging box can better resist deformation or damage when subjected to external impact or extrusion, thereby more effectively protecting the internal goods, significantly improving the durability of the packaging box material, and making it more suitable for logistics packaging needs.

[0030] (2) The present invention prepares wear-resistant fillers as filling modifiers for packaging box materials, mixes them with a polylactic acid matrix and other additives, and forms an inorganic protective layer in the matrix. When the packaging box material is subjected to friction, the halloysite nanotubes and hollow glass microspheres will play a "ball"-like effect, enhancing the effect of rolling friction while reducing the friction coefficient between the phase interfaces, significantly improving the wear resistance of the packaging box material, and avoiding wear and tear caused by frequent handling, loading and unloading, stacking and transportation of the packaging box during the logistics process, thereby ensuring the safety and integrity of the items during transportation.

[0031] (3) The present invention uses biodegradable polylactic acid as the base material of the packaging box, avoiding the potential risk of environmental pollution caused by using traditional polyolefin materials. It is an environmentally friendly packaging box material with broad application prospects.

[0032] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is an infrared spectrum test chart of the modified bamboo fiber and the composite reinforcing agent prepared in Example 1 of the present invention;

[0035] Figure 2 This is a scanning electron microscope image of the halloysite nanotubes and wear-resistant filler prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe 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.

[0037] 1. Preparation of composite reinforcing agent

[0038] S1: Add 3 g of bamboo fiber with a diameter of 5 μm and a length of 2 mm and 50 ml of a 10% potassium hydroxide solution in a reactor, then place it in a constant temperature oscillator, oscillate for 1 hour at a temperature of 45°C and a rotation speed of 150 r / min, then wash with ionized water, filter, and dry to obtain pretreated bamboo fiber;

[0039] S2: 3 g of pretreated bamboo fiber was placed in toluene, ultrasonically dispersed for 30 min, nitrogen was passed through for protection, and then 1.2 g of thioglycolic acid and 0.05 g of p-toluenesulfonic acid were added, stirred evenly, the system temperature was raised to 100 ° C, kept warm for 6 h, cooled and discharged, and the modified bamboo fiber was obtained;

[0040] S3: Add 3g of modified bamboo fiber, 1.8g of styrene-butadiene rubber and cyclohexane into the reactor, stir mechanically to mix them thoroughly, then evaporate the solvent, dry and obtain a masterbatch, mix the masterbatch with 0.1g of diphenylguanidine, and then pour into a torque rheometer, set the temperature in the torque rheometer to 140°C, mix at a speed of 50r / min for 15min, take out the product, and obtain a composite reinforcing agent.

[0041] The modified bamboo fiber and composite reinforcement were tested by infrared spectrometer Bruker Vertex 70. Figure 1 As shown in the figure, the analysis shows that in the infrared spectrum of the modified bamboo fiber, 2560cm -1 The characteristic absorption peak of SH appears at 1745 cm -1 The characteristic absorption peak of ester group C=O appears at 1740cm -1 The characteristic absorption peak of ester group C=O appears at 1190cm -1 The characteristic absorption peak of CSC appears at 3080cm -1 The characteristic absorption peak of CH in the benzene ring appears at 2560cm -1 The disappearance of the absorption peak at SH indicates that -SH has participated in the reaction.

[0042] 2. Preparation of wear-resistant filler

[0043] Ⅰ: Place 5g of hollow glass microspheres in the plasma treatment chamber, turn on the power, turn on the vacuum pump, and when the vacuum degree in the chamber reaches 9Pa, open the flow valve to let in oxygen to activate the hollow glass microspheres to obtain pretreated hollow glass microspheres;

[0044] Ⅱ: Disperse 5 g of pretreated hollow glass microspheres and 5 g of halloysite nanotubes with a length of 8 μm and a diameter of 500 nm in dimethyl sulfoxide to form a uniform suspension, then add 1.8 g of adipoyl chloride and 1 g of potassium carbonate to the suspension, stir and mix evenly, stir at room temperature for 5 hours, and then filter and collect the solid material to obtain a wear-resistant filler.

[0045] The morphology of the halloysite nanotubes and wear-resistant fillers was analyzed using an Elionix, ELS-7500EXTK scanning electron microscope. The test results are shown in Figure 1 , where A is halloysite nanotubes and B is wear-resistant filler. As can be seen from the figure, the surface of the halloysite nanotubes is smooth, while the surface of the wear-resistant filler is rough. This is because the hollow glass microspheres are combined with the halloysite nanotubes.

[0046] 3. Preparation of packaging materials

[0047] (1) 20 g of polylactic acid, 10 g of polycaprolactone, 4 g of composite reinforcing agent, 8 g of wear-resistant filler, 2 g of dimethyl phthalate, 1 g of polyethylene wax, and 0.5 g of antioxidant 1098 were placed in a high-speed mixer and mixed for 10 min to obtain a premix;

[0048] (2) The premix obtained in step (1) is placed in a screw extruder at a temperature of 140° C. to plasticize and melt the premix into a mixed material, and then the mixed material is extruded and granulated through a corresponding die and a pelletizer to form a masterbatch, and then the masterbatch is molded by molding to obtain a packaging box material.

[0049] Example 2

[0050] Preparation of packaging materials

[0051] (1) 30 g of polylactic acid, 20 g of polycaprolactone, 5 g of composite reinforcing agent, 9 g of wear-resistant filler, 2.5 g of dimethyl phthalate, 1.5 g of polyethylene wax, and 1 g of antioxidant 1098 were placed in a high-speed mixer and mixed for 15 min to obtain a premix;

[0052] (2) The premix obtained in step (1) is placed in a screw extruder at a temperature of 150° C. to plasticize and melt the premix into a mixture, and then the mixture is extruded and granulated through a corresponding die and a pelletizer to form a masterbatch, and then the masterbatch is molded by molding to obtain a packaging box material.

[0053] The preparation method of the composite reinforcing agent and the wear-resistant filler is the same as that in Example 1.

[0054] Example 3

[0055] Preparation of packaging materials

[0056] (1) 40 g of polylactic acid, 30 g of polycaprolactone, 6 g of composite reinforcing agent, 10 g of wear-resistant filler, 3 g of dimethyl phthalate, 2 g of polyethylene wax, and 1.5 g of antioxidant 1098 were placed in a high-speed mixer and mixed for 20 min to obtain a premix;

[0057] (2) The premix obtained in step (1) is placed in a screw extruder at a temperature of 160° C. to plasticize and melt the premix into a mixed material, and then the mixed material is extruded and granulated through a corresponding die and a pelletizer to form a masterbatch, and then the masterbatch is molded by molding to obtain a packaging box material.

[0058] The preparation method of the composite reinforcing agent and the wear-resistant filler is the same as that in Example 1.

[0059] Comparative Example 1

[0060] Preparation of packaging materials

[0061] (1) 30 g of polylactic acid, 20 g of polycaprolactone, 5 g of composite reinforcing agent, 2.5 g of dimethyl phthalate, 1.5 g of polyethylene wax, and 1 g of antioxidant 1098 were placed in a high-speed mixer and mixed for 15 min to obtain a premix;

[0062] (2) The premix obtained in step (1) is placed in a screw extruder at a temperature of 150° C. to plasticize and melt the premix into a mixture, and then the mixture is extruded and granulated through a corresponding die and a pelletizer to form a masterbatch, and then the masterbatch is molded by molding to obtain a packaging box material.

[0063] The preparation method of the composite reinforcing agent is the same as that in Example 1.

[0064] Comparative Example 2

[0065] Preparation of packaging materials

[0066] (1) 30 g of polylactic acid, 20 g of polycaprolactone, 9 g of wear-resistant filler, 2.5 g of dimethyl phthalate, 1.5 g of polyethylene wax, and 1 g of antioxidant 1098 were placed in a high-speed mixer and mixed for 15 min to obtain a premix;

[0067] (2) The premix obtained in step (1) is placed in a screw extruder at a temperature of 150° C. to plasticize and melt the premix into a mixture, and then the mixture is extruded and granulated through a corresponding die and a pelletizer to form a masterbatch, and then the masterbatch is molded by molding to obtain a packaging box material.

[0068] The preparation method of the wear-resistant filler is the same as that in Example 1.

[0069] Comparative Example 3

[0070] Preparation of packaging materials

[0071] (1) 30 g of polylactic acid, 20 g of polycaprolactone, 5 g of a composite reinforcing agent, 5 g of halloysite nanotubes, 4 g of hollow glass microspheres, 2.5 g of dimethyl phthalate, 1.5 g of polyethylene wax, and 1 g of antioxidant 1098 were placed in a high-speed mixer and mixed for 15 min to obtain a premix;

[0072] (2) The premix obtained in step (1) is placed in a screw extruder at a temperature of 150° C. to plasticize and melt the premix into a mixture, and then the mixture is extruded and granulated through a corresponding die and a pelletizer to form a masterbatch, and then the masterbatch is molded by molding to obtain a packaging box material.

[0073] The preparation method of the composite reinforcing agent is the same as that in Example 1.

[0074] Comparative Example 4

[0075] Preparation of packaging materials

[0076] (1) 30 g of polylactic acid, 20 g of polycaprolactone, 2.5 g of dimethyl phthalate, 1.5 g of polyethylene wax, and 1 g of antioxidant 1098 were placed in a high-speed mixer and mixed for 15 min to obtain a premix;

[0077] (2) The premix obtained in step (1) is placed in a screw extruder at a temperature of 150° C. to plasticize and melt the premix into a mixture, and then the mixture is extruded and granulated through a corresponding die and a pelletizer to form a masterbatch, and then the masterbatch is molded by molding to obtain a packaging box material.

[0078] Performance Testing

[0079] The packaging box materials prepared in Examples 1 to 3 of the present invention and Comparative Examples 1 to 4 were made into samples that met the specifications. The tensile properties and elongation at break of the samples were tested according to GB / T 1040.1-2018 "Determination of tensile properties of plastics Part 1: General Principles"; the bending properties of the samples were tested according to GB / T 9341-2008 "Determination of bending properties of plastics"; the impact strength of the samples was tested according to GB / T 1843-2008 "Determination of cantilever beam impact strength of plastics"; according to GB / T 3960-2016 "Plastic sliding friction and wear test method", the friction and wear performance test was carried out on an M-2000 wear tester, the test load was 200N, the wear time was 2h, and the wear resistance of the samples was evaluated by calculating the friction coefficient. The specific test results are shown in the following table:

[0080]

[0081] From the test results in the above table, it can be seen that the samples prepared in Examples 1 to 3 have good mechanical properties, toughness and wear resistance; a composite reinforcing agent is added to the sample prepared in Comparative Example 1, and compared with the example, the mechanical properties and toughness of the sample are better, and the wear resistance is poorer; wear-resistant fillers are added to the samples prepared in Comparative Example 2, and compared with the example, the wear resistance of the sample is better, and the mechanical properties and toughness are poorer; composite reinforcing agents, halloysite nanotubes and hollow glass microspheres are added to the samples prepared in Comparative Example 3, and compared with the example, the mechanical properties and toughness of the sample are better, and the wear resistance is average. It is speculated that in the preparation process of the packaging box material, the compatibility between the halloysite nanotubes and the hollow glass microspheres and the matrix material is poor, and agglomeration occurs, resulting in a decrease in the performance of the sample; neither composite reinforcing agents nor wear-resistant fillers are added to the samples prepared in Comparative Example 5, and the mechanical properties, toughness and wear resistance of the samples are all poor.

[0082] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A green and degradable packaging box material for logistics, characterized in that: The invention comprises the following raw materials in parts by weight: 20 to 40 parts of polylactic acid, 10 to 30 parts of polycaprolactone, 4 to 6 parts of composite reinforcing agent, 8 to 10 parts of wear-resistant filler, 2 to 3 parts of plasticizer, 1 to 2 parts of lubricant, and 0.5 to 1.5 parts of antioxidant; The preparation method of the composite reinforcing agent comprises the following steps: S1: adding bamboo fiber and potassium hydroxide solution into a reactor, and then placing it in a constant temperature oscillator, oscillating it at a temperature of 40-50° C. and a rotation speed of 100-200 r / min for 0.5-1.5 h, then washing it with ionized water, filtering it, and drying it to obtain pretreated bamboo fiber; S2: placing the pretreated bamboo fiber in toluene, ultrasonically dispersing for 20 to 40 minutes, passing nitrogen protection, then adding thioglycolic acid and a catalyst, stirring evenly, raising the system temperature to 90 to 110°C, heat preservation for 5 to 7 hours, cooling and discharging, and obtaining modified bamboo fiber; S3: adding modified bamboo fiber, styrene-butadiene rubber and cyclohexane into a reactor, mechanically stirring to fully mix them, then volatilizing the solvent, drying to obtain a masterbatch, mixing the masterbatch with diphenylguanidine, and then pouring it into a torque rheometer, setting the temperature in the torque rheometer to 130-150° C., mixing at a speed of 40-60 r / min for 10-20 min, taking out the product, and obtaining a composite reinforcing agent; The preparation method of the wear-resistant filler comprises the following steps: Ⅰ: Place the hollow glass microspheres in the chamber of the plasma treatment instrument, turn on the power, turn on the vacuum pump, and when the vacuum degree in the chamber reaches 8-10Pa, open the flow valve to let in oxygen to activate the hollow glass microspheres to obtain pretreated hollow glass microspheres; II: The pretreated hollow glass microspheres and halloysite nanotubes are dispersed in dimethyl sulfoxide to form a uniform suspension, and then the diacyl chloride monomer and the accelerator are added to the suspension, stirred at room temperature for 4 to 6 hours, and then filtered to collect the solid material to obtain a wear-resistant filler.

2. The green and degradable packaging box material for logistics according to claim 1, characterized in that: In step S1, the bamboo fiber has a diameter of 1 to 10 μm and a length of 1 to 3 mm.

3. The green and degradable packaging box material for logistics according to claim 1, characterized in that: In step S1, the mass fraction of the potassium hydroxide solution is 10% to 40%.

4. The green and degradable packaging box material for logistics according to claim 1, characterized in that: In step S2, the catalyst is any one of aminosulfonic acid, trifluoromethanesulfonic acid or p-toluenesulfonic acid.

5. The green and degradable packaging box material for logistics according to claim 1, characterized in that: In step II, the length of the halloysite nanotube is 5 to 10 μm, and the diameter is 50 to 800 nm.

6. The green and degradable packaging box material for logistics according to claim 1, characterized in that: In step II, the diacyl chloride monomer is any one of succinyl chloride, glutaryl chloride or adipoyl chloride.

7. The green and degradable packaging box material for logistics according to claim 1, characterized in that: In step II, the accelerator is any one of sodium carbonate, potassium carbonate or sodium bicarbonate.

8. A method for preparing a green and degradable packaging box material for logistics as claimed in claim 1, characterized in that: The following steps are involved: (1) placing polylactic acid, polycaprolactone, a composite reinforcing agent, a wear-resistant filler, a plasticizer, a lubricant, and an antioxidant in a high-speed mixer and mixing for 10 to 20 minutes to obtain a premix; (2) placing the premix obtained in step (1) in a screw extruder at a temperature of 140 to 160° C., plasticizing and melting the premix to form a mixed material, and then extruding the mixed material through a corresponding die and a pelletizer to form a masterbatch, and then molding the masterbatch to obtain a packaging box material.

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