Disposable tableware forming method based on biomass composite material

Abstract

The invention discloses a disposable tableware forming method based on a biomass composite material, and relates to the technical field of disposable tableware manufacturing, and the forming method comprises the following specific steps: S100, raw material mixing preparation: weighing rice hull powder, bagasse powder, cornstalk powder, corncob powder and honeysuckle vine powder according to a mass ratio, the high-performance biomass composite material is successfully developed by combining various biomass raw materials including the rice hull powder, the bagasse powder, the cornstalk powder, the corncob powder and the honeysuckle vine powder and adding auxiliary materials including the polybutadiene rubber, the rosemary extract, the plant polyphenol substances and the natural vegetable wax. The composite material not only has excellent biodegradability and environmental protection property, but also is remarkably improved in mechanical property and water resistance, and compared with traditional plastic tableware, the biomass composite material tableware disclosed by the invention has the advantages that the environmental pollution is reduced, and the use performance and safety of the tableware are also ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of disposable tableware manufacturing, and specifically to a forming method of disposable tableware based on biomass composite materials. Background Art

[0002] With the increasing awareness of environmental protection and the deepening of the concept of sustainable development, finding new materials that can replace traditional plastics and have excellent biodegradability has become an important direction in current materials science research. In the catering industry, the use of disposable tableware is huge, but its treatment often brings a heavy burden to the environment. Therefore, it is particularly urgent to develop environmentally friendly and biodegradable disposable tableware materials. As an emerging environmentally friendly material, biomass composite materials have attracted much attention due to their wide raw material sources, renewable and biodegradable characteristics. It is mainly prepared from crop waste and forestry waste through specific processing techniques and has broad application prospects.

[0003] Although biomass composite materials have significant advantages in environmental protection, there are still many deficiencies in applying this material with traditional disposable tableware forming technologies. On the one hand, traditional forming processes often use high temperature and high pressure methods, which not only consume a large amount of energy but also may damage the original structure of the biomass material, resulting in a decline in its mechanical properties. On the other hand, traditional forming processes often require the addition of a large amount of chemical additives during the preparation process, which not only increases the production cost but also may cause secondary pollution to the environment. In addition, disposable tableware prepared by traditional forming processes also has deficiencies in water resistance and heat resistance and is difficult to meet the actual use requirements.

[0004] Therefore, developing a forming method of disposable tableware based on biomass composite materials is of great significance for promoting the resource utilization of agricultural waste, reducing plastic pollution, and protecting the ecological environment. At the same time, it also opens up a new way for the application of biomass materials. Summary of the Invention

[0005] The purpose of the present invention is to make up for the deficiencies of the existing technology and provide a forming method of disposable tableware based on biomass composite materials. This method uses agricultural waste such as rice husk powder and bagasse powder as raw materials and successfully prepares environmentally friendly tableware with excellent mechanical properties and water resistance through steps of microwave pretreatment, composite material preparation, and microwave-assisted forming. The forming method of the present invention has a simple process, is easy to operate, and the prepared tableware can be completely biodegradable, solving the environmental pollution problem brought by traditional disposable tableware.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A forming method of disposable tableware based on biomass composite materials, and the specific steps of this forming method are as follows:

[0007] S100, Preparation of raw material mixture: Weigh the raw materials of rice husk powder, bagasse powder, corn stalk powder, corn cob powder and honeysuckle vine powder according to the mass ratio. After screening, stir and mix them in a high-strength mixer to make a composite biomass fiber raw material; at the same time, prepare the raw materials of polybutadiene rubber, rosemary extract, plant polyphenols and natural plant wax.

[0008] S200, Strengthening of raw material pretreatment: Place the mixed biomass fiber raw material in a microwave device and process it according to the set microwave power.

[0009] S300, Preparation of composite material: Add the biomass fiber raw material pretreated by microwave, polybutadiene rubber, rosemary extract, plant polyphenol modifier, natural plant wax and polylactic acid bio-based resin into a twin-screw extruder with heating, stirring and vacuum functions for mixing and stirring, and cut it into composite material particles with a size of 3-5 mm by a water-cooled pelletizer.

[0010] S400, Microwave-assisted molding: Uniformly put the prepared composite material particles into a special mold, place the mold in a microwave molding device, heat up to 180-220 °C, the material softens and fills the mold cavity, and the equipment cooling system cools the outside of the mold with a coolant at 20-30 °C to keep the mold temperature at 120-150 °C. After heating, the mold cools naturally in the equipment.

[0011] S500, Post-treatment and finished product: Air-cool the molded tableware, polish and trim the edges, correct the dimensional accuracy, and package it after quality inspection.

[0012] Furthermore, in the S100, preparation of raw material mixture, the particle size of the rice husk powder is 40-60 mesh, accounting for 20%-30% of the total mass of the composite biomass fiber raw material; the particle size of the bagasse powder is 30-50 mesh, accounting for 15%-25% of the composite biomass fiber raw material; the particle size of the corn stalk powder is 50-70 mesh, accounting for 20%-25% of the composite biomass fiber raw material; the particle size of the corn cob powder is 40-60 mesh, accounting for 10%-20% of the composite biomass fiber raw material; the particle size of the honeysuckle vine powder is 35-55 mesh, accounting for 10%-15% of the composite biomass fiber raw material.

[0013] Even further, in the S100, preparation of raw material mixture, the dosage of polybutadiene rubber is 5%-10% of the mass of the composite biomass fiber raw material, the addition amount of rosemary extract is 0.5%-2% of the mass of the composite biomass fiber raw material, the addition amount of plant polyphenols is 1%-3% of the mass of the composite biomass fiber raw material, and the addition amount of natural plant wax is 2%-5% of the mass of the composite biomass fiber raw material.

[0014] Furthermore, in S100, during the preparation of raw material mixing, the plant polyphenol substances are a mixture of tannic acid and catechin, which are combined with biomass fibers through physical blending or chemical cross-linking, and the ratio of the two is 1:1.

[0015] Furthermore, in S200, during the strengthening of raw material pretreatment, the microwave power is 5 - 10 kW, and the treatment time is 10 - 20 minutes.

[0016] Furthermore, in S300, during the preparation of the composite material, the intrinsic viscosity of the polylactic acid bio-based resin is 0.6 - 0.8 dL / g, and the weight-average molecular weight is 10×10 4 - 15×10 4 , and the addition amount is 30% - 50% of the mass of the composite biomass fiber raw material.

[0017] Furthermore, in S300, during the preparation of the composite material, the temperature of the front section of the twin-screw extruder is 150 - 170 °C, the temperature of the middle section is 160 - 180 °C, the temperature of the rear section is 170 - 190 °C, the temperature of the die head is 180 - 200 °C, the initial screw speed is 80 - 120 revolutions per minute, and finally it is adjusted to 180 - 220 revolutions per minute, and the vacuum degree is 0.07 - 0.09 MPa.

[0018] Furthermore, in S400, during the microwave-assisted molding, the mold is made of silicon carbide material, preheated to 70 - 90 °C before use, the power of the microwave molding equipment is 5 - 20 kW, the heating time is 5 - 10 minutes, and it is naturally cooled for 4 - 6 minutes after heating.

[0019] Furthermore, in S500, during the post-treatment and finished product, when air-cooling, the distance between the fan and the mold is 0.4 - 0.6 m, the wind speed is 4 - 6 m per second, the cooling time is 30 - 50 minutes, and it is polished and trimmed with 200-mesh, 400-mesh, and 600-mesh sandpapers in sequence; a sharp trimming knife is used to trim the edge; the quality inspection includes appearance, dimensional accuracy, mechanical properties, and water resistance detection.

[0020] Compared with the prior art, this one-time tableware molding method based on biomass composite materials has the following beneficial effects:

[0021] I. The present invention combines various biomass raw materials such as rice husk powder, bagasse powder, corn stalk powder, corn cob powder, and honeysuckle vine powder, and adds auxiliary materials such as polybutadiene rubber, rosemary extract, plant polyphenols, and natural plant wax to successfully develop a high-performance biomass composite material. This composite material not only has excellent biodegradability and environmental friendliness, but also its mechanical properties and water resistance have been significantly improved. Compared with traditional plastic tableware, the biomass composite tableware of the present invention reduces environmental pollution while ensuring the usability and safety of the tableware. In addition, by precisely controlling the particle size, proportion of raw materials, and microwave pretreatment process parameters, it can ensure that the biomass composite material is evenly heated during the microwave-assisted forming process, thereby further improving the forming accuracy and stability of the tableware, not only broadening the application field of the biomass composite material, but also providing new ideas for the research and development of environmentally friendly tableware.

[0022] II. Through the heating, stirring, and vacuum functions of the twin-screw extruder, the present invention realizes the full mixing and uniform dispersion of biomass fiber raw materials and various additives, thereby improving the uniformity and performance stability of the composite material. In the microwave-assisted forming stage, a mold made of silicon carbide and high-efficiency microwave forming equipment are used to achieve the rapid softening and forming of the composite material, while ensuring the high-temperature resistance and durability of the mold. In addition, by precisely controlling the process parameters such as microwave power, heating time, and cooling method, the forming method of the present invention can further optimize the forming effect and performance of the tableware, not only improving the production efficiency and product quality of the biomass composite tableware, but also providing a useful reference for process optimization and equipment improvement in related fields.

[0023] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be learned from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a flowchart of a forming method for disposable tableware based on biomass composite materials. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0027] Embodiment 1:

[0028] Raw material mixing preparation: According to the claims, accurately weigh various raw materials. Prepare rice husk powder with a particle size of 40-60 mesh, accounting for 25% of the total composite biomass fiber raw material mass, sugarcane bagasse powder with a particle size of 30-50 mesh, accounting for 18%, corn stalk powder with a particle size of 50-70 mesh, accounting for 22%, corn cob powder with a particle size of 40-60 mesh, accounting for 15%, and honeysuckle vine powder with a particle size of 35-55 mesh, accounting for 12%. After screening these raw materials, put them into a strong mixer and stir and mix them thoroughly to make composite biomass fiber raw materials.

[0029] Meanwhile, prepare polybutadiene rubber, the amount of which is 7% of the mass of the composite biomass fiber raw material; rosemary extract, the amount of which is 1.2% of the mass of the composite biomass fiber raw material; plant polyphenols (tannic acid and catechins mixed in a ratio of 1:1), the amount of which is 2% of the mass of the composite biomass fiber raw material; natural plant wax, the amount of which is 3% of the mass of the composite biomass fiber raw material.

[0030] Raw material pretreatment enhancement: Place the mixed biomass fiber raw materials in the microwave equipment, set the microwave power to 8 kilowatts, and the processing time to 15 minutes. Through microwave treatment, the raw material properties are enhanced to prepare for subsequent processing.

[0031] Preparation of composite materials: Polylactic acid bio-based resin was selected, with an intrinsic viscosity of 0.7dL / g and a weight average molecular weight of 120,000, and the addition amount was 40% of the mass of the composite biomass fiber raw material. The biomass fiber raw material pretreated by microwave was added together with polybutadiene rubber, rosemary extract, plant polyphenol modifier, natural plant wax and polylactic acid bio-based resin into a twin-screw extruder with heating, stirring and vacuum functions.

[0032] The temperature of the front section of the twin-screw extruder was set to 160°C, the temperature of the middle section was 170°C, the temperature of the rear section was 180°C, and the temperature of the die head was 190°C. The screw speed was initially set to 100 revolutions per minute, and gradually adjusted to 200 revolutions per minute, and the vacuum degree was maintained at 0.08MPa. After sufficient mixing and stirring, the composite material was cut into 3-5 mm composite material particles by a water-cooled pelletizer.

[0033] Microwave-assisted forming: Select a special mold made of silicon carbide. Preheat the mold to 80 °C before use. Evenly put the prepared composite material particles into the mold, and then place the mold in the microwave forming equipment. Set the power of the microwave forming equipment to 15 kW and the heating time to 8 minutes to raise the temperature in the mold to 200 °C. At this time, the material softens and fills the mold cavity. The cooling system of the equipment cools the outside of the mold with a coolant at 25 °C to keep the mold temperature at 130 °C. After heating, the mold is naturally cooled in the equipment for 5 minutes.

[0034] Post-treatment and finished product: Air-cool the formed disposable lunch box. Set the distance between the fan and the mold to 0.5 m, the wind speed to 5 m per second, and the cooling time to 40 minutes. After cooling, use 200-mesh, 400-mesh, and 600-mesh sandpapers to polish the lunch box in sequence, and then use a sharp trimming knife to trim the edges to ensure that the appearance of the lunch box is smooth and the edges are neat.

[0035] Finally, conduct quality inspections, including checking whether there are defects in the appearance of the lunch box, whether the dimensional accuracy meets the standards, testing whether the mechanical properties of the lunch box meet the usage requirements, and testing the water resistance of the lunch box. The qualified lunch boxes after inspection are packaged and prepared for market launch.

[0036] In summary, the present invention is a method for forming disposable tableware based on biomass composite materials. First, weigh a variety of raw materials such as rice husk powder according to a specific mass ratio and mix them to make a composite biomass fiber raw material, and prepare other auxiliary raw materials. Then, microwave-treat and strengthen the mixed raw materials, and then make composite material particles with a variety of additives in a twin-screw extruder. After that, put the particles into a silicon carbide mold, heat and form them in a microwave equipment, and conduct post-treatments such as air-cooling, polishing and edge trimming, and precision correction after cooling. This method uses a variety of biomass raw materials, which are environmentally friendly and renewable. The parameters of each link are accurately set to ensure the quality of disposable tableware, and it has good application prospects in the field of tableware production.

[0037] Example two:

[0038] In this research on the method for forming disposable tableware based on biomass composite materials, focusing on the influence of the content of polybutadiene rubber on the product performance, 10 comparative experiments were carried out while keeping other raw materials and process parameters unchanged.

[0039] The experimental process was strictly carried out according to the forming method in the invention, and only the content of polybutadiene rubber was changed in sequence, which was set to 3%-12% of the mass of the composite biomass fiber raw material respectively. In the stage of raw material mixing and preparation, each raw material was accurately weighed to ensure that the proportions and specifications of biomass fiber raw materials such as rice husk powder and bagasse powder, as well as additives such as rosemary extract and plant polyphenols, met the requirements of the original invention except for the content of polybutadiene rubber. In subsequent links such as raw material pretreatment and strengthening, composite material preparation, microwave-assisted forming, and post-treatment, the established process parameters were also strictly followed.

[0040] After a series of experiments, rich data were obtained. The specific results are shown in the following table:

[0041]

[0042] It can be seen from the experimental results that the content of polybutadiene rubber has a significant impact on the performance of disposable tableware. When the content is between 3% and 7%, as the content increases, the dimensional accuracy deviation decreases, and the tensile strength, flexural strength, and water resistance time all show an upward trend. This indicates that appropriately increasing the polybutadiene rubber can effectively improve the comprehensive performance of the product, making the tableware more durable and having better appearance quality. However, when the content of polybutadiene rubber exceeds 7%, the performance of the product begins to decline. For example, when the content reaches 10%, the glossiness significantly decreases and the phenomenon of sticking to the mold appears; when the content is 12%, the surface of the product is rough, with many defects, the tensile strength and flexural strength are greatly reduced, and the water resistance time is also significantly shortened. This shows that too high a content of polybutadiene rubber will have a negative impact on the product quality, which is not conducive to the production and use of disposable tableware. Generally speaking, in the production of disposable tableware based on this biomass composite material, when the content of polybutadiene rubber is controlled at about 7%, the product performance reaches the relatively optimal state.

[0043] Example 3:

[0044] In this study, to explore the influence of the content of rosemary extract on the performance of disposable tableware based on biomass composite materials, while keeping other raw materials and process parameters unchanged, only the content of rosemary extract was changed, and 10 comparative experiments were carried out. The whole process of the experiment was strictly carried out according to the original method for forming disposable tableware of the invention to ensure the reliability and comparability of the experimental results.

[0045] During the experiment, various raw materials were accurately weighed. The proportions and specifications of biomass fiber raw materials such as rice husk powder and bagasse powder, as well as additives such as polybutadiene rubber and plant polyphenols, all followed the requirements of the original invention. In the links of raw material pretreatment strengthening, composite material preparation, microwave-assisted forming, and post-treatment, the process parameters were also strictly controlled. For example, the microwave power, the temperature of the twin-screw extruder, and the screw speed were all the same as those of the original invention.

[0046] In the 10 comparative experiments, the content of rosemary extract was successively set at 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, and 2.0% of the mass of the composite biomass fiber raw material. After a series of rigorous experimental operations, the following experimental results were obtained:

[0047]

[0048] It can be seen from the experimental data that the content of rosemary extract has a significant impact on the performance of disposable tableware. In the range of 0.2%-1.0%, as the content of rosemary extract increases, the dimensional accuracy deviation decreases, and the tensile strength, flexural strength, and water resistance time all increase, and the antibacterial rate also increases significantly. This indicates that appropriate addition of rosemary extract helps to enhance the comprehensive performance of the tableware, not only improving the physical properties but also endowing the product with good antibacterial ability. However, when the content of rosemary extract exceeds 1.0%, the appearance quality, mechanical properties, and antibacterial properties of the product all show varying degrees of decline. For example, when the content reaches 2.0%, the surface is rough and there is an obvious color difference, the tensile strength and flexural strength drop to a level similar to that at 0.2% content, and the antibacterial rate also decreases. Thus, it can be seen that during the production of this disposable tableware, when the content of rosemary extract is controlled at about 1.0%, the comprehensive performance of the product reaches the relatively optimal state.

[0049] Example 4:

[0050] This experiment aims to explore the influence of the content of plant polyphenols on the performance of disposable tableware based on biomass composites. Throughout the experiment, the operation was strictly carried out according to the original disposable tableware forming method of the invention, only changing the content of plant polyphenols, while other raw materials and process parameters remained unchanged to ensure the accuracy and reliability of the experimental results.

[0051] Before the experiment started, various biomass fiber raw materials such as rice husk powder and bagasse powder, as well as additives such as polybutadiene rubber, rosemary extract, natural plant wax, and polylactic acid bio-based resin were accurately weighed, and their proportions and specifications all followed the requirements of the original invention. In the raw material pretreatment strengthening stage, the mixed biomass fiber raw materials were placed in a microwave device, with the microwave power set at 5-10 kW and the treatment time at 10-20 minutes; in the composite material preparation process, parameters such as the front section, middle section, rear section, and head temperature of the twin-screw extruder, screw speed, and vacuum degree were all strictly set according to the original invention; the same was true for the microwave-assisted forming and post-treatment stages.

[0052] In 10 comparative experiments, the content of plant polyphenols (a 1:1 mixture of tannic acid and catechin) was successively set at 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, and 5.0% of the mass of the composite biomass fiber raw materials. After careful experimental operations, the following experimental data were obtained:

[0053]

[0054] It can be seen from the experimental results that the content of plant polyphenols has an important impact on the performance of disposable tableware. When the content is between 0.5% and 2.5%, with the increase of its content, the dimensional accuracy deviation decreases, and the tensile strength, bending strength, water resistance time and antioxidant property all show an upward trend. This indicates that appropriately increasing the content of plant polyphenols can effectively improve the physical properties, water resistance and antioxidant properties of the tableware. However, when the content of plant polyphenols exceeds 2.5%, the performance of the product begins to decline. For example, when the content reaches 5.0%, the surface of the product is rough and has obvious defects, the tensile strength and bending strength decrease, the water resistance time shortens, and the antioxidant property is also significantly weakened. To sum up, in the production of disposable tableware based on this biomass composite material, when the content of plant polyphenols is controlled at about 2.5%, the comprehensive performance of the product reaches the relatively best state and can meet various actual use requirements.

[0055] Example Five:

[0056] In this experiment, the focus was on exploring the influence of the content of natural plant wax on the performance of disposable tableware based on biomass composite materials. The whole experiment was carried out strictly in accordance with the original disposable tableware forming method of the invention, only the content of natural plant wax was adjusted, and the other raw materials and process parameters remained unchanged to ensure the scientificity and reliability of the experimental results.

[0057] Before the experiment, the biomass fiber raw materials such as rice husk powder and bagasse powder, as well as additives such as polybutadiene rubber, rosemary extract, plant polyphenols and polylactic acid bio-based resin were accurately weighed to ensure that their proportions and specifications fully met the requirements of the original invention. In each link of raw material pretreatment strengthening, composite material preparation, microwave-assisted forming and post-treatment, the parameters set by the original invention were strictly followed, such as microwave power, temperature and rotation speed of the twin-screw extruder, and vacuum degree.

[0058] In 10 comparative experiments, the content of natural plant wax was set at 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5% of the mass of the composite biomass fiber raw material respectively. After rigorous experimental operations, the following experimental data were finally obtained:

[0059]

[0060] Analysis of the experimental data shows that the content of natural plant wax has a significant impact on the performance of disposable tableware. When the content gradually increases within the range of 1%-3%, the dimensional accuracy deviation decreases, and the tensile strength, flexural strength, water resistance time, and hydrophobicity all show an upward trend. This indicates that appropriately increasing the natural plant wax can effectively improve the physical properties, water resistance, and surface hydrophobic characteristics of the tableware. However, when the content of natural plant wax exceeds 3%, the performance of the product begins to decline. For example, when the content reaches 5.5%, the product surface is rough with obvious defects and water stains, the tensile strength and flexural strength decrease, the water resistance time shortens, and the hydrophobicity also weakens significantly. Thus, in the production process of disposable tableware based on this biomass composite material, when the content of natural plant wax is controlled at about 3%, the comprehensive performance of the product is relatively optimal and can better meet the actual use requirements.

[0061] Example Six:

[0062] This experiment focused on studying the performance changes of disposable tableware based on biomass composite materials at different storage times. The experiment was strictly carried out according to the original disposable tableware forming method of the invention, ensuring that the content of each substance and the production process parameters remained unchanged, and only changing the storage time of the product to observe the dynamic changes in product performance, providing a reference basis for product quality evaluation and shelf life setting.

[0063] In the experimental preparation stage, biomass fiber raw materials such as rice husk powder, bagasse powder, corn stalk powder, corn cob powder, and honeysuckle vine powder, as well as additives such as polybutadiene rubber, rosemary extract, plant polyphenols, natural plant wax, and polylactic acid bio-based resin, were accurately weighed to make their proportions and specifications fully meet the requirements of the original invention. In each link of raw material pretreatment strengthening, composite material preparation, microwave-assisted forming, and post-treatment, the process parameters set by the original invention were strictly followed, including microwave power, temperature and rotation speed of the twin-screw extruder, vacuum degree, etc.

[0064] After a batch of disposable tableware was produced, product samples of the same specification and qualified quality were selected and stored for 0 months (i.e., just produced), 1 month, 2 months, 3 months, 4 months, 5 months, 6 months, 7 months, 8 months, and 9 months respectively in a normal temperature, dry, and well-ventilated environment.

[0065] At each storage time node, a comprehensive performance test was carried out on the product, and the specific experimental data are as follows:

[0066]

[0067] As can be seen from the experimental results, with the extension of storage time, the various properties of disposable tableware gradually deteriorate. The dimensional accuracy deviation gradually increases, which may affect the usability of the product. The tensile strength and flexural strength also show a downward trend, indicating that the mechanical properties of the product are continuously weakened and it is more likely to be damaged during use. The water resistance time gradually shortens, meaning that the waterproof performance of the product decreases. And the continuous increase in the color difference directly reflects the degree of color change of the product. Based on comprehensive data, in an environment of normal temperature, dryness and good ventilation, after 4-5 months of storage, the properties of the disposable tableware based on this biomass composite material decline significantly. Considering from the perspectives of product quality and usability, its shelf life can be initially set at about 4 months, but the actual shelf life needs to be further studied and determined in combination with more usage scenarios and conditions.

[0068] Example VII:

[0069] The purpose of this experiment is to compare the performance differences between the disposable tableware produced based on the present invention and the common disposable tableware on the market. When producing the disposable tableware of the present invention, it is strictly carried out according to the established forming method to ensure that the content of each substance and the process parameters remain unchanged. Based on this, a comprehensive performance comparison is made with disposable tableware of different materials in society, providing a basis for evaluating the market competitiveness of the products of the present invention.

[0070] The production process of the disposable tableware of the present invention starts from the preparation of raw material mixing. Biomass fiber raw materials such as rice husk powder and bagasse powder, as well as additives such as polybutadiene rubber and rosemary extract are accurately weighed to make their proportions meet the requirements of the original invention. Then, steps such as raw material pretreatment strengthening, composite material preparation, microwave-assisted forming and post-treatment are carried out in sequence, and the parameters of each link are strictly controlled.

[0071] Common plastic (polypropylene PP material), paper and starch-based disposable tableware on the market are selected as comparison objects. The appearance, dimensional accuracy, mechanical properties, water resistance, environmental protection performance, etc. of various tableware are detected, and the specific comparison data are as follows:

[0072]

[0073] As can be seen from the comparison results, in terms of appearance, the disposable tableware of the present invention has unique natural textures. Although it is not as brightly colored as plastic tableware, it also has its own characteristics; the surface of paper tableware is relatively rough, and the starch-based tableware is between the two. In terms of dimensional accuracy, the tableware of the present invention performs well, being similar to plastic tableware and superior to paper and starch-based tableware. In terms of mechanical properties, the plastic tableware has the highest tensile and flexural strengths, followed by the tableware of the present invention, then the starch-based tableware, and the paper tableware is the worst. In terms of water resistance, the plastic tableware performs best, the tableware of the present invention can meet daily use, the starch-based tableware is acceptable, and the paper tableware is relatively poor.

[0074] In terms of environmental protection performance, the disposable tableware of the present invention has a relatively fast degradation rate, only about 3 - 6 months, which is much shorter than the 200 - 500 years of plastic tableware, similar to paper tableware and superior to starch-based tableware. In terms of raw material costs, the costs of several types of tableware are not much different, and the cost of the tableware of the present invention is at a medium level. In terms of energy consumption during the production process, the energy consumption of the tableware of the present invention is lower than that of plastic and paper tableware, and slightly higher than that of starch-based tableware. Generally speaking, the disposable tableware of the present invention has advantages in terms of environmental protection performance and energy consumption. Although it is slightly inferior to plastic tableware in some mechanical properties and water resistance, its overall performance is relatively balanced, and it has a certain market competitiveness under the market trend of pursuing environmental protection and sustainable development.

[0075] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the above-disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A forming method for disposable tableware based on biomass composite materials, characterized in that, The specific steps of this forming method are as follows: S100, Preparation of raw material mixing: Weigh raw materials such as rice husk powder, bagasse powder, corn straw powder, corn cob powder and honeysuckle vine powder according to mass ratio. After screening, stir and mix them in a high-strength mixer to make a composite biomass fiber raw material; at the same time, prepare raw materials such as polybutadiene rubber, rosemary extract, plant polyphenols and natural plant wax; S200, Strengthening of raw material pretreatment: Place the mixed biomass fiber raw material in a microwave device and process it according to the set microwave power; S300, Preparation of composite material: Add the biomass fiber raw material pretreated by microwave, polybutadiene rubber, rosemary extract, plant polyphenol modifier, natural plant wax and polylactic acid bio-based resin into a twin-screw extruder with heating, stirring and vacuum functions for mixing and stirring, and cut it into composite material particles with a size of 3-5 mm by a water-cooled pelletizer; S400, Microwave-assisted forming: Uniformly put the prepared composite material particles into a special mold, place the mold in a microwave forming device, heat up to 180-220 °C, the material softens and fills the mold cavity, and the equipment cooling system cools the outside of the mold with a coolant at 20-30 °C to keep the mold temperature at 120-150 °C. After heating, the mold cools naturally in the equipment; S500, Post-treatment and finished product: Air-cool the formed tableware, polish and trim the edges, correct the dimensional accuracy, and package it after quality inspection.

2. A method for forming a disposable tableware based on a biomass composite material according to claim 1, wherein, In S100, the particle size of the rice husk powder in the preparation of raw material mixing is 40-60 mesh, accounting for 20%-30% of the total mass of the composite biomass fiber raw material; the particle size of the bagasse powder is 30-50 mesh, accounting for 15%-25% of the composite biomass fiber raw material; the particle size of the corn straw powder is 50-70 mesh, accounting for 20%-25% of the composite biomass fiber raw material; the particle size of the corn cob powder is 40-60 mesh, accounting for 10%-20% of the composite biomass fiber raw material; the particle size of the honeysuckle vine powder is 35-55 mesh, accounting for 10%-15% of the composite biomass fiber raw material.

3. The one-off tableware forming method based on biomass composite materials according to claim 1, characterized in that In S100, the dosage of polybutadiene rubber in the preparation of raw material mixing is 5%-10% of the mass of the composite biomass fiber raw material, the addition amount of rosemary extract is 0.5%-2% of the mass of the composite biomass fiber raw material, the addition amount of plant polyphenols is 1%-3% of the mass of the composite biomass fiber raw material, and the addition amount of natural plant wax is 2%-5% of the mass of the composite biomass fiber raw material.

4. A method for forming a disposable tableware based on a biomass composite material according to claim 3, characterized in that, In S100, the plant polyphenols in the preparation of raw material mixing are a mixture of tannic acid and catechin, and the ratio of the two is 1:

1.

5. A method for forming a disposable tableware based on a biomass composite material according to claim 1, characterized in that, In S200, the microwave power in the strengthening of raw material pretreatment is 5-10 kW, and the treatment time is 10-20 minutes.

6. A method for forming a disposable tableware based on a biomass composite material according to claim 1, characterized in that, For the S300, the intrinsic viscosity of the polylactic acid biobased resin in the composite material preparation is 0.6 - 0.8 dL / g, and the weight-average molecular weight is 10×10 4 - 15×10 4 , and the addition amount is 30% - 50% of the mass of the composite biomass fiber raw material.

7. A method for forming a disposable tableware based on a biomass composite material according to claim 1, characterized in that In S300, the temperature of the front section of the twin-screw extruder in the preparation of composite material is 150-170 °C, the temperature of the middle section is 160-180 °C, the temperature of the rear section is 170-190 °C, the temperature of the head is 180-200 °C, the initial screw speed is 80-120 revolutions per minute, and finally adjusted to 180-220 revolutions per minute, and the vacuum degree is 0.07-0.09 MPa.

8. A method for forming a disposable tableware based on a biomass composite material according to claim 1, characterized in that, For the S400, in microwave-assisted molding, the mold is made of silicon carbide. It is preheated to 70 - 90 °C before use. The power of the microwave molding equipment is 5 - 20 kW, the heating time is 5 - 10 minutes, and after heating, it is naturally cooled for 4 - 6 minutes.

9. A method for forming a disposable tableware based on a biomass composite material according to claim 1, characterized in that, For the S500, during air cooling in post-treatment and for the finished product, the distance between the fan and the mold is 0.4 - 0.6 m, the wind speed is 4 - 6 m per second, the cooling time is 30 - 50 minutes, and it is polished and trimmed with 200-mesh, 400-mesh, and 600-mesh sandpapers in sequence; a sharp trimming knife is used to trim the edges; quality inspection includes appearance, dimensional accuracy, mechanical properties, and water resistance inspection.

Images