Antibacterial and degradable plant fiber tableware and preparation method thereof

Abstract

The present invention discloses an antibacterial and degradable plant fiber tableware and a preparation method thereof. The antibacterial and degradable plant fiber tableware is prepared by high-temperature anaerobic pyrolysis technology to prepare plant-derived antibacterial liquid, and microfiber loading and sustained release technology and in-situ molding composite technology are used to organically combine antibacterial materials with degradable tableware. Compared with the prior art, the antibacterial and degradable plant fiber tableware prepared by the present invention has the advantages of mildness and non-toxicity, good degradability, good antibacterial properties, no cytotoxicity and no skin irritation.

Description

Technical Field

[0001] The present invention relates to the technical field of environmentally friendly tableware, and in particular to antibacterial and degradable plant fiber tableware and a preparation method thereof. Background Art

[0002] In recent years, with the rapid development of "Internet + Catering," the use of disposable tableware in the takeout industry has increased, sparking public concern about environmental issues. The emergence of new products such as bagasse tableware and pulp mold tableware has provided strong support for addressing environmental issues.

[0003] However, the development and application of non-food bio-based materials, particularly plant fibers, still face many key challenges. Among them, excessive microbial content during raw material pretreatment, product production, storage, and transportation is a major risk factor. During manufacturing and processing, plant-derived products are susceptible to microbial contamination. If not thoroughly disinfected, they can come into contact with various pathogens and molds, creating a breeding ground for bacteria and viruses, leading to product contamination. Packaging damage during storage and transportation can also lead to excessive microbial content. Storage in damp, hot, and poorly ventilated warehouses, particularly during the rainy season, can increase the temperature and humidity, fostering bacterial growth. Even with high-temperature sterilization prior to shipment, numerous contact contamination steps can occur during storage, transportation, and use, leading to microbial proliferation and even the production of mycotoxins, posing health and safety risks.

[0004] Therefore, how to provide a method for preparing plant fiber tableware so that the prepared tableware can achieve the technical effects of reducing cytotoxicity, improving antibacterial properties and improving degradation properties is a technical problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0005] In view of the hidden dangers of microbial contamination in degradable tableware in the prior art, the potential toxicity and non-degradability of chemically synthesized antibacterial agents, the technical problem to be solved by the present invention is to prepare plant-derived antibacterial agents through high-temperature anaerobic pyrolysis technology, and to organically combine antibacterial materials with degradable tableware using microfiber loading technology, sustained-release technology and in-situ molding composite technology to obtain a plant fiber tableware with active sterilization function, good antibacterial and degradability, and no potential toxicity.

[0006] To achieve the above object, the present invention provides a method for preparing antibacterial and degradable plant fiber tableware.

[0007] S1. Antibacterial microfibers are prepared by mixing a substrate with a plant-derived antibacterial liquid, beating the mixture, and slurrying the mixture; the substrate is one or more of sugarcane pulp and bamboo fiber pulp; and the plant-derived antibacterial liquid is prepared by high-temperature anaerobic pyrolysis of agricultural and forestry waste as raw materials;

[0008] S2. The antibacterial microfibers are sequentially subjected to the processes of blanking, shaping, hot pressing, and trimming to obtain antibacterial and degradable plant fiber tableware.

[0009] Preferably, the method of preparing the antibacterial microfibers by mixing the substrate with the plant-derived antibacterial liquid, and then beating and slurrying the fibers comprises:

[0010] S11, preparing an antibacterial aqueous solution using a plant-derived antibacterial liquid as a functional component and water as a solvent;

[0011] S12, adding the substrate into the antibacterial aqueous solution, and preparing the antibacterial microfibers by beating and slurrying.

[0012] Preferably, the preparation method of the plant-derived antibacterial liquid is as follows:

[0013] S111, sorting agricultural and forestry waste to remove impurities and cutting into small pieces;

[0014] S112, dry distilling the agricultural and forestry waste cut into small pieces by high-temperature anaerobic pyrolysis to obtain a dry distillation product, wherein the dry distillation temperature is 300 to 600 degrees Celsius;

[0015] S113, condensing the obtained dry distillation product and allowing it to stand, and then subjecting it to rectification and purification processes to remove solid impurities to obtain the plant-derived antibacterial liquid.

[0016] Preferably, the agricultural and forestry waste includes one or more of grapevines, lychee wood, chestnut wood, casuarina, apple wood, and pear wood.

[0017] Preferably, the substrate is one or more of sugarcane pulp board and bamboo fiber pulp board.

[0018] Preferably, the hot pressing temperature is 150 to 350 degrees Celsius, the hot pressing time is 10 to 120 seconds, and the molding pressure during hot pressing is 0.5 to 1.5 MPa.

[0019] Due to the adoption of the above technical solutions, the present invention has the following advantages compared with the prior art: 1) The present invention uses plant-derived antibacterial liquid as the antibacterial agent for the fiber, which has the advantages of being mild, non-toxic, degradable, non-cytotoxic and non-skin irritating compared with traditional antibacterial agents; 2) The base material adopted by the present invention is 100% sugarcane pulp board or bamboo fiber pulp board, which is a 100% non-food bio-based material, achieving zero plastic addition and completely avoiding the generation of microplastics; 3) The present invention utilizes lignin in the soft A certain pressure is applied at the melting point to make it tightly adhere to the cellulose, forming a composite structure with lignin as the adhesive and cellulose and hemicellulose as the "skeleton". This composite structure realizes the slow release of antibacterial components and ensures a long-term antibacterial effect. The antibacterial rate reaches 99.99%, and the antibacterial rate can still be maintained above 99% after 3 months; 4) The raw materials used in the preparation of the plant-derived antibacterial liquid of the present invention are all derived from agricultural and forestry wastes. The promotion of the project can realize the high-value resource utilization and environmental protection of the entire industrial chain of agricultural and forestry residues, and effectively reduce the emission of CO2 from agricultural and forestry residues. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. 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 paying any creative work.

[0021] Figure 1 This is a simplified process flow chart for the preparation of antibacterial and biodegradable plant fiber tableware;

[0022] Figure 2 is the SEM picture of the antibacterial fiber before hot pressing;

[0023] Figure 3 This is the SEM photo of the antibacterial tableware after hot pressing;

[0024] Figure 4 This is a light microscope photo of antibacterial tableware after heat pressing. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the embodiments described are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this invention.

[0026] Example 1

[0027] like Figure 1As shown, this embodiment 1 provides a method for preparing antibacterial and degradable plant fiber tableware, which specifically includes: S1, preparing antibacterial microfibers by mixing a base material with a plant-derived antibacterial agent, and pulping and slurrying; the base material is one or more of sugarcane pulp board and bamboo fiber pulp board; the plant-derived antibacterial agent is prepared by high-temperature anaerobic pyrolysis technology using agricultural and forestry waste as raw materials; S2, preparing antibacterial and degradable plant fiber tableware by subjecting the antibacterial microfibers to a one-time molding, shaping, hot pressing, and trimming process.

[0028] Compared with the prior art, the method for preparing antibacterial and degradable plant fiber tableware provided in Example 1 of the present invention has the following advantages:

[0029] 1) The present invention uses plant-derived antibacterial liquid as an antibacterial agent for fibers. Compared with traditional antibacterial agents, the plant-derived antibacterial liquid has the advantages of being mild, non-toxic, non-irritating, degradable, non-cytotoxic and non-skin irritating. 2) The base material used in the present invention is 100% sugarcane pulp board or bamboo fiber pulp board, which is a 100% non-food bio-based material, achieving zero plastic addition and completely avoiding the production of microplastics. 3) The present invention precisely selects the hot pressing temperature, hot pressing time and hot pressing molding pressure, and uses lignin to apply a certain pressure at the softening point to make it tightly adhere to and bond with cellulose, forming a composite structure with lignin as a binder and cellulose and hemicellulose as a "skeleton". This composite structure realizes the slow release of antibacterial components and ensures a long-term antibacterial effect. The antibacterial rate reaches 99.99%, and the antibacterial rate can still be maintained at more than 99% after 3 months. 4) The raw materials used in the preparation of the plant-derived antibacterial liquid of the present invention are all derived from agricultural and forestry wastes. The promotion of the project can realize the high-value resource and environmentally friendly utilization of the entire industrial chain of agricultural and forestry residues, and effectively reduce the emission of CO2 from agricultural and forestry residues.

[0030] In some possible implementations, the method of preparing antibacterial microfibers by mixing a substrate with a plant-derived antibacterial liquid and pulping and slurrying specifically includes: S11, preparing an antibacterial aqueous solution using the plant-derived antibacterial liquid as a functional component and water as a solvent; S12, adding the substrate to the antibacterial aqueous solution, and pulping and slurrying to produce antibacterial microfibers.

[0031] Specifically, plant-derived antimicrobial agents as antimicrobial ingredients can achieve high-efficiency disinfection of common bacteria, fungi and viruses, and are mild, non-irritating and biodegradable. 100% sugarcane pulp board or bamboo fiber pulp board is used as the base material, and plant-derived antimicrobial liquid is used as the antimicrobial ingredient. The two are mixed, and during the high-speed beating process, the fibers are split longitudinally, and the fiber surface is filamentous and fluffy. The hydrogen bonds and van der Waals forces between the microfibers and the antimicrobial liquid molecules are used to achieve a high surface loading of the antimicrobial agent, so that the obtained microfibers have antibacterial properties.

[0032] In some possible implementations, the method for preparing the plant-derived antibacterial liquid is as follows: S111, sorting agricultural and forestry waste to remove impurities and cutting them into small segments; S112, dry distilling the agricultural and forestry waste cut into small segments by high-temperature anaerobic cracking to obtain a dry distillation product; S113, condensing the obtained dry distillation product and letting it stand, and then subjecting it to distillation and purification processes to obtain the plant-derived antibacterial liquid.

[0033] Specifically, agricultural and forestry waste is cut into small sections and then distilled to allow the antibacterial components in the waste to be distilled more fully; agricultural and forestry waste decomposes at high temperatures to form small molecular organic matter rich in plant phenols, acids, alcohols, and ketones, which can achieve efficient disinfection of common bacteria, fungi, and viruses, and is mild, non-irritating, and degradable.

[0034] In some possible implementations, in the process of preparing antibacterial and degradable plant fiber tableware by subjecting the antibacterial microfibers to a one-time molding process of blanking, shaping, hot pressing, and trimming, the hot pressing temperature is 150 to 350 degrees Celsius, the hot pressing time is 10 to 120 seconds, and the molding pressure during hot pressing is 0.5 to 1.5 MPa.

[0035] Specifically, by precisely selecting the hot pressing temperature, hot pressing time and hot pressing molding pressure, and applying a certain pressure to lignin at its softening point, it is tightly bonded and glued to cellulose, forming a composite structure with lignin as the adhesive and cellulose and hemicellulose as the "skeleton". This composite structure achieves the slow release of antibacterial ingredients and ensures long-term antibacterial effects. The antibacterial rate reaches 99.99%, and the antibacterial rate can still be maintained at above 99% after 3 months.

[0036] Example 2

[0037] like Figure 3 and Figure 4 As shown, the second embodiment of the present invention provides an antibacterial and degradable plant fiber tableware, which is prepared by the preparation method in the above-mentioned embodiment one. Those skilled in the art can understand that since the tableware uses 100% sugarcane pulp board or bamboo fiber pulp board as the base material, the plant-derived antibacterial liquid is used as the antibacterial component, and is formed in one step through the blanking, hot pressing, and trimming processes, the antibacterial and degradable plant fiber tableware has the advantages of being mild and non-toxic, non-skin irritating, non-cytotoxic, and having good antibacterial and degradable properties. It should be noted that the antibacterial and degradable plant fiber tableware in this embodiment two is prepared by the preparation method described in embodiment one, so the performance principle of the antibacterial and degradable plant fiber tableware will not be repeated here. For the undetailed part, please refer to embodiment one.

[0038] In order to further illustrate the technical solution of the present application in detail to support the technical problem to be solved by the present application, the preparation method is described below with specific examples, such as Examples 1 to 3.

[0039] Example 1

[0040] A method for preparing antibacterial and degradable plant fiber tableware, comprising the following steps:

[0041] Sorting litchi wood to remove impurities and cutting into small pieces;

[0042] The agricultural and forestry waste cut into small pieces is subjected to dry distillation by high-temperature anaerobic pyrolysis to obtain a dry distillation product at a dry distillation temperature of 450 degrees Celsius;

[0043] The obtained dry distillation product is condensed and allowed to stand, and then subjected to conventional rectification and purification processes in the prior art to remove solid impurities to obtain a plant-derived antibacterial liquid;

[0044] The obtained plant-derived antibacterial liquid was used as the functional component and water was used as the solvent to prepare an antibacterial aqueous solution with a mass concentration of 5%;

[0045] Adding sugarcane pulp into a prepared antibacterial aqueous solution with a mass concentration of 5%, beating and slurrying to produce antibacterial microfibers with a mass concentration of 0.5%;

[0046] The antibacterial microfibers with a mass concentration of 0.5% are formed into antibacterial and degradable plant fiber tableware through a conventional blanking, hot pressing and trimming process in the prior art. The hot pressing temperature is 150 degrees Celsius, the hot pressing time is 120 seconds, and the forming pressure during hot pressing is 0.5 MPa.

[0047] Example 2

[0048] A method for preparing antibacterial and degradable plant fiber tableware, comprising the following steps:

[0049] Sorting litchi wood to remove impurities and cutting into small pieces;

[0050] The agricultural and forestry waste cut into small pieces is subjected to dry distillation by high-temperature anaerobic pyrolysis to obtain a dry distillation product at a dry distillation temperature of 450 degrees Celsius;

[0051] The obtained dry distillation product is condensed and allowed to stand, and then subjected to conventional rectification and purification processes in the prior art to remove solid impurities to obtain a plant-derived antibacterial liquid;

[0052] The obtained plant-derived antibacterial liquid was used as the functional component and water was used as the solvent to prepare an antibacterial aqueous solution with a mass concentration of 20%;

[0053] Adding sugarcane pulp into a prepared antibacterial aqueous solution with a mass concentration of 20%, beating and slurrying to produce antibacterial microfibers with a mass concentration of 2.5%;

[0054] The antibacterial microfibers with a mass concentration of 2.5% are formed into antibacterial and degradable plant fiber tableware through a conventional blanking, hot pressing and trimming process in the prior art. The hot pressing temperature is 200 degrees Celsius, the hot pressing time is 60 seconds, and the forming pressure during hot pressing is 1 MPa.

[0055] Example 3

[0056] A method for preparing antibacterial and degradable plant fiber tableware, comprising the following steps:

[0057] Sorting litchi wood to remove impurities and cutting into small pieces;

[0058] The agricultural and forestry waste cut into small pieces is subjected to dry distillation by high-temperature anaerobic pyrolysis to obtain a dry distillation product at a dry distillation temperature of 450 degrees Celsius;

[0059] The obtained dry distillation product is condensed and allowed to stand, and then subjected to conventional rectification and purification processes in the prior art to remove solid impurities to obtain a plant-derived antibacterial liquid;

[0060] The obtained plant-derived antibacterial liquid was used as the functional component and water was used as the solvent to prepare an antibacterial aqueous solution with a mass concentration of 40%;

[0061] Adding sugarcane pulp into a prepared antibacterial aqueous solution with a mass concentration of 40%, beating and slurrying to produce antibacterial microfibers with a mass concentration of 5%;

[0062] The antibacterial microfibers with a mass concentration of 5% are formed into antibacterial and degradable plant fiber tableware through a conventional blanking, hot pressing and trimming process in the existing technical field. The hot pressing temperature is 350 degrees Celsius, the hot pressing time is 10 seconds, and the forming pressure during hot pressing is 1.5 MPa.

[0063] The safety evaluation of the antibacterial tableware prepared by Example 1, Example 2, and Example 3 is as follows:

[0064] Safety evaluation of antibacterial tableware:

[0065] Table 1 Safety evaluation of antibacterial tableware

[0066]

[0067] As can be seen from Table 1, the antibacterial and degradable plant fiber tableware prepared in the present invention has the characteristics of being mild, non-toxic, non-skin irritating, and non-cytotoxic.

[0068] The performance comparison of the antibacterial and degradable plant fiber tableware prepared in Example 1, Example 2, and Example 3 is as follows:

[0069] Antibacterial testing:

[0070] The antibacterial property of the antibacterial and degradable plant fiber tableware prepared by the present invention was tested with reference to the Chinese national standard GB / T 20944.3-2008 "Evaluation of antibacterial properties of textiles Part 3: Oscillation method". The test bacteria was Escherichia coli (ATCC 8739). The test results are shown in Table 2.

[0071] Table 2 Antibacterial effect

[0072] Group Antibacterial rate / % Antibacterial rate after 1 month / % Antibacterial rate after 2 months / % Antibacterial rate after 3 months / % Example 1 99.38 99.21 99.16 99.10 Example 2 99.98 99.49 99.24 99.12 Example 3 99.99 99.58 99.44 99.39

[0073] As shown in Table 2, the antibacterial rate of the antibacterial and degradable plant fiber tableware prepared by the present invention can reach 99.99%, and the antibacterial rate can still be maintained above 99% after 3 months, with good antibacterial property and antibacterial stability.

[0074] Degradability test:

[0075] The antibacterial and degradable plant fiber tableware prepared in the present invention was subjected to a degradability test with reference to the Chinese national standard GB / T 19277.1-2011 “Determination of the ultimate aerobic biodegradability of materials under controlled composting conditions using the method of measuring released carbon dioxide Part 1: General method”. The biodegradability rate was calculated based on the released CO2. The test results are shown in Table 3.

[0076] Table 3 Degradation effect

[0077] Group 180-day degradation rate / % Example 1 98.9 Example 2 97.8 Example 3 96.6

[0078] As shown in Table 3, the 180-day degradation rate of the antibacterial and degradable plant fiber tableware prepared by the present invention is maintained at above 96%, and can reach 98.9%, with good degradation effect.

[0079] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A method for preparing antibacterial and degradable plant fiber tableware, characterized in that: S1. The antibacterial microfibers are prepared by mixing a substrate with a plant-based antibacterial liquid, beating the pulp, and adjusting the pulp; the substrate is one or more of a sugarcane pulp board and a bamboo fiber pulp board; the plant-based antibacterial liquid is prepared by high-temperature anaerobic pyrolysis technology using agricultural and forestry waste as raw materials; S2, preparing antibacterial and degradable plant fiber tableware by subjecting the antibacterial microfibers to a one-step molding process of blanking, shaping, hot pressing, and trimming; In the process of preparing antibacterial and degradable plant fiber tableware by subjecting the antibacterial microfibers to one-time molding through blanking, shaping, hot pressing, and trimming processes, the hot pressing temperature is 150 to 350 degrees Celsius, the hot pressing time is 10 to 120 seconds, and the molding pressure during hot pressing is 0.5 to 1.5 MPa.

2. The method for preparing antibacterial and degradable plant fiber tableware according to claim 1, characterized in that: The method of preparing the antibacterial microfiber by mixing the substrate with the plant-derived antibacterial liquid and pulping and adjusting the pulp specifically includes: S11, preparing an antibacterial aqueous solution using a plant-derived antibacterial liquid as a functional component and water as a solvent; S12, adding the substrate into the antibacterial aqueous solution, and preparing the antibacterial microfibers by pulping and slurry adjustment.

3. The method for preparing antibacterial and degradable plant fiber tableware according to claim 2, characterized in that: The preparation method of the plant-derived antibacterial liquid is as follows: S111, sorting agricultural and forestry waste to remove impurities and cutting them into small pieces; S112, dry distilling the agricultural and forestry waste cut into small pieces by high-temperature anaerobic pyrolysis to obtain a dry distillation product; S113, condensing the obtained dry distillation product and letting it stand, and then subjecting it to rectification and purification processes to obtain the plant-derived antibacterial liquid.

4. The method for preparing antibacterial and degradable plant fiber tableware according to claim 3, characterized in that: The agricultural and forestry wastes include one or more of grapevines, litchi wood, chestnut wood, casuarina, apple wood, and pear wood.

5. The method for preparing antibacterial and degradable plant fiber tableware according to claim 4, characterized in that: In the process of dry distilling the agricultural and forestry waste cut into small pieces by high-temperature anaerobic pyrolysis, the temperature of the dry distillation is 300 to 600 degrees Celsius.

6. The method for preparing antibacterial and degradable plant fiber tableware according to claim 5, characterized in that: The mass concentration of the plant-derived antibacterial liquid in the antibacterial aqueous solution is 5-40%.

7. The method for preparing antibacterial and degradable plant fiber tableware according to claim 6, characterized in that: The mass concentration of the base material in the antibacterial microfiber is 0.5-5%.

8. The method for preparing antibacterial and degradable plant fiber tableware according to claim 1, characterized in that: In the process of preparing antibacterial and degradable plant fiber tableware by subjecting the antibacterial microfibers to one-time molding, shaping, hot pressing, and trimming processes, the hot pressing temperature is 150 degrees Celsius, the hot pressing time is 120 seconds, and the molding pressure during hot pressing is 0.5 MPa. 9.An antibacterial and degradable plant fiber tableware, characterized by: The antibacterial and degradable plant fiber tableware is prepared by the preparation method according to any one of claims 1 to 8.

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