Antistatic and antibacterial functional three-dimensional bag and preparation method thereof

Abstract

The invention discloses an antistatic and antibacterial functional three-dimensional bag and a preparation method thereof, and belongs to the technical field of three-dimensional bag preparation. The antistatic and antibacterial functional three-dimensional bag is prepared from the following components in parts by weight: 70-85 parts of polyethylene, 3-8 parts of an antibacterial and antistatic agent, 2-5 parts of a modified toughening agent, 0.5-1 part of an antioxidant, 0.5-1.1 parts of a lubricant and 0.1-2 parts of a coloring agent, the antibacterial and antistatic agent is prepared from 3-bromobenzoic acid, propylene glycol, palmitoleic acid, propylene and hydroxyethyl methylacrylate, and the modified toughening agent is prepared from 3-bromobenzoic acid, propylene glycol, palmitoleic acid, propylene and hydroxyethyl methylacrylate. The toughening agent is prepared from polylactic acid, collagen, wheat straw, propionic acid and propionic anhydride. The three-dimensional bag prepared by the method has excellent antibacterial property, antistatic property and toughness.

Description

Technical Field

[0001] The present invention belongs to the technical field of three-dimensional bag preparation, and particularly relates to an antistatic and antibacterial functional three-dimensional bag and a preparation method thereof. Background Art

[0002] In modern industry and daily life, the selection and application of packaging materials play a crucial role in product protection, storage, transportation, and the ultimate consumer experience. With the progress of technology and the diversification of consumer demands, traditional packaging materials are increasingly unable to meet the market's requirements for high efficiency, safety, environmental protection, and other aspects. Especially in industries such as electronics, food, and medicine, more stringent standards are imposed on the performance of packaging materials.

[0003] In the electronics industry, with the miniaturization and increased integration of electronic components, static electricity has become a major concern. It can not only damage sensitive electronic components but also pose safety risks such as fires or explosions. Traditional packaging materials such as ordinary plastic bags, due to their relatively high resistivity, are prone to static electricity accumulation and cannot meet the high requirements for antistatic performance in electronic products. At the same time, the food industry also faces challenges such as freshness preservation and antibacterial properties. Traditional materials such as polyethylene and polypropylene have deficiencies in antibacterial performance, and food is easily contaminated by microorganisms during storage and transportation, leading to spoilage and deterioration. Especially in the packaging of powdered foods, static electricity can also affect the sealing performance of the packaging and exacerbate the risk of food spoilage. The medical industry has extremely high requirements for the sterility and antistatic performance of packaging materials to ensure the safety and effectiveness of products such as medical devices and drugs. Therefore, the development of packaging materials with excellent antistatic and antibacterial properties has become an industry consensus.

[0004] Patent CN115434033A discloses an antistatic plastic woven bag and a preparation method thereof. The technical solution includes polypropylene, linear polyethylene, antistatic masterbatch, coupling agent, antistatic agent, environmentally friendly flame retardant, talcum powder, silicone resin, filling masterbatch, ultraviolet absorber, nano-silica, synthetic agent, mildew and antibacterial agent, antioxidant, blending agent, plasticizer, alkyl primary amine, and polyacrylamide. The woven bag prepared by this technical solution has excellent antistatic properties and service strength, but there is still room for improvement in the antistatic performance, antibacterial performance, and toughness of the woven bag prepared by this method. Summary of the Invention

[0005] The purpose of the present invention is to provide an antistatic and antibacterial functional three-dimensional bag and a preparation method thereof to solve the technical problems of poor antistatic performance, antibacterial performance, and toughness of three-dimensional bags in the prior art.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The present invention provides an antistatic and antibacterial functional three-dimensional bag, which is composed of the following components in parts by weight: 70-85 parts of polyethylene, 3-8 parts of an antibacterial and antistatic agent, 2-5 parts of a modified toughening agent, 0.5-1 part of an antioxidant, 0.5-1.1 parts of a lubricant, 0.1-2 parts of a colorant. Among them, the antibacterial and antistatic agent is prepared from 3-bromobenzoic acid, propylene glycol, palmitoleic acid, propylene and 2-hydroxyethyl methacrylate, and the toughening agent is prepared from polylactic acid, collagen, wheat straw, propionic acid and propionic anhydride.

[0008] Preferably, the preparation method of the antibacterial and antistatic agent comprises the following steps:

[0009] Q1: Add 3-bromobenzoic acid and propylene glycol into a closed container, heat and distill for reaction. After the reaction is completed, wash, dissolve, dry and rotary evaporate to obtain Compound 1;

[0010] Q2: Add palmitoleic acid and toluene into a container, heat and react in an oil bath. Then, dropwise add N,N-dibenzylethanolamine under stirring conditions. After the addition is completed, raise the temperature for reflux reaction. After the reaction is completed, perform vacuum distillation, recrystallization and vacuum drying to obtain Compound 2;

[0011] Q3: Add Compound 1 and Compound 2 into a container containing chloroform, heat, stir and reflux for reaction, rotary evaporate, recrystallize and vacuum dry to obtain Compound 3;

[0012] Q4: Under a nitrogen atmosphere, sequentially add anhydrous ethanol, propylene, 2-hydroxyethyl methacrylate and Compound 3 into a container equipped with a stirring device, a condensing reflux device and a thermometer. Stir at room temperature and then add azobisisobutyronitrile. Slowly raise the temperature for reaction. After the reaction is completed, cool down, rotary evaporate, concentrate, precipitate and vacuum dry to obtain the antibacterial and antistatic agent.

[0013] In the above process, the synthesis reaction formula of the antibacterial and antistatic agent is as follows:

[0014]

[0015] The results of mass spectrometry analysis of Compound 1 were as follows: m / z: 441.92 (100.0%), 439.93 (51.4%), 443.92 (48.6%), 442.93 (18.8%), 440.93 (9.6%), 444.93 (9.3%), 443.93 (2.5%), 441.93 (1.3%), 445.93 (1.2%); the results of mass spectrometry analysis of Compound 2 were as follows: m / z: 477.36 (100.0%), 478.36 (35.1%), 479.37 (6.0%); the results of mass spectrometry analysis of Compound 3 were as follows: m / z: 1396.65 (100.0%), 1397.65 (74.5%), 1394.65 (42.5%), 1398.64 (40.3%), 1395.65 (37.9%), 1399.65 (37.3%), 1398.65 (34.4%), 1400.65 (16.6%), 1399.66 (9.7%), 1401.65 (5.1%), 1397.66 (4.8%), 1400.66 (2.6%), 1398.66 (1.3%), 1402.66 (1.0%).

[0016] Preferably, in Q1, the molar ratio of 3-bromobenzoic acid to propylene glycol is (1.8 - 2.3):(0.9 - 1.1), the reaction temperature for heating and distillation is 120 - 150 °C, the reaction time is 6 - 8 h. First, it is washed with distilled water, and then washed with an aqueous methanol solution. The volume ratio of methanol to distilled water in the aqueous methanol solution is (80 - 100):(20 - 25). Then it is dissolved in chloroform and dried with anhydrous sodium sulfate.

[0017] Preferably, in Q2, the molar ratio of palmitoleic acid to N,N-dibenzylethanolamine is (1 - 1.4):(1.5 - 2.1), the reaction temperature for heating in an oil bath is 90 - 110 °C, the reaction temperature for heating under reflux is 150 - 160 °C, the reflux reaction time is 14 - 18 h, and it is recrystallized with petroleum ether.

[0018] Preferably, in Q3, the molar ratio of Compound 1 to Compound 2 is (1 - 1.5):(1.9 - 2.8), the heating and stirring reflux reaction temperature is 60 - 70 °C, the reaction time is 8 - 12 h, and recrystallization is carried out with a mixed solution of acetone and distilled water with a volume ratio of 40:1; in Q4, the dosage ratio of absolute ethanol, propylene, 2-hydroxyethyl methacrylate, Compound 3 and azobisisobutyronitrile is (110 - 130) mL:(4.82 - 5.24) g:(6.12 - 6.88) g:(25.12 - 28.54) g:(0.26 - 0.45) g, the stirring speed at room temperature is 200 - 250 rpm, the temperature for the temperature-raising reaction is 70 - 80 °C, the reaction time is 6 - 8 h, the vacuum drying temperature is 75 - 85 °C, and the time is 20 - 24 h.

[0019] Preferably, the preparation method of the modified toughening agent comprises the following steps:

[0020] S1: Add polylactic acid and collagen into a container filled with dimethyl sulfoxide, stir to dissolve and then place it in a water bath environment. Under stirring conditions, slowly add the dimethyl sulfoxide solution of N,N'-dicyclohexylcarbodiimide into the container for reaction. After the reaction is completed, pour it into distilled water, collect the precipitate, wash and dry to obtain modified polylactic acid;

[0021] S2: Wash, dry, crush and sieve wheat straw to obtain pretreated straw, and then add it into an aqueous potassium hydroxide solution for heating reaction. After the reaction is completed, cool, mechanically stir, wash, filter and freeze-dry to obtain microfibers;

[0022] S3: Add the microfibers into sodium hypochlorite, stir, take out and wash to obtain oxidized microfibers. Add the oxidized microfibers and propionic acid into a container for soaking, and then add propionic anhydride and concentrated sulfuric acid for heating and magnetic stirring reaction. After the reaction is completed, add deionized water, cool, centrifuge, wash and freeze-dry to obtain modified microfibers;

[0023] S4: Carry out melt mixing of the modified polylactic acid and the modified microfibers, and obtain the modified toughening agent by melt spinning.

[0024] In the above process, N,N'-dicyclohexylcarbodiimide is used as a dehydrating condensing agent to activate the carboxyl group of polylactic acid to form an active intermediate. Subsequently, the amino group in collagen attacks the active intermediate to form an amide bond, realizing the grafting of collagen onto polylactic acid to obtain modified polylactic acid. Wheat straw is prepared into modified microfibers through alkaline hydrolysis, oxidation and esterification reactions. Then, the modified polylactic acid and the modified microfibers are melt-mixed to obtain the modified toughening agent.

[0025] Preferably, in S1, the dosage ratio of polylactic acid, collagen and N,N-dicyclohexylcarbodiimide is (2-3.5) g:(2-4.8) g:(0.1-0.13) g, the water bath environment temperature is 18-22 °C, and the reaction time is 12-14 h; in S2, the dosage ratio of pretreated straw and potassium hydroxide aqueous solution is (5-7.5) g:(100-130) mL, the mass fraction of the potassium hydroxide aqueous solution is 15 wt%, the heating reaction temperature is 90-95 °C, the reaction time is 1-2 h, and the mechanical stirring time is 4-6 h.

[0026] Preferably, in S3, the dosage ratio of microfiber and sodium hypochlorite is (3-4.2) g:(12-18) mL, and the dosage ratio of oxidized microfiber, propionic acid, propionic anhydride and concentrated sulfuric acid is (3-5) g:(20-25) g:(6-13) g:(0.02-0.03) mL. The heating magnetic stirring reaction temperature is 90-110 °C, and the reaction time is 2-3 h; in S4, the dosage ratio of modified polylactic acid and modified microfiber is (12-20) g:(3-5) g. The melting mixing temperatures are set at 160 °C, 165 °C, 175 °C, 185 °C and 190 °C respectively, the mixing speed is 100-110 rpm, the spinning temperature during the micro-melt spinning process is 190-195 °C, the screw speed is 30-45 rpm, and the winding speed is 20-24 m / min.

[0027] Preferably, the preparation method of the antistatic antibacterial functional three-dimensional bag includes the following steps:

[0028] Step 1: Add polyethylene, antibacterial and antistatic agent, modified toughening agent, antioxidant, lubricant and colorant to a high-speed mixer for mixing to obtain a mixed material;

[0029] Step 2: Melt, extrude, granulate, cool, blow film, cure, slit, and thermoform the mixed material to obtain an antistatic antibacterial functional three-dimensional bag.

[0030] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0031] The present invention first uses 3-bromobenzoic acid, propylene glycol, palmitoleic acid, propylene, and 2-hydroxyethyl methacrylate as raw materials to prepare an antibacterial and antistatic agent. Subsequently, polylactic acid, collagen, wheat straw, propionic acid, and propionic anhydride are used as raw materials to prepare a toughening agent. During the process of preparing a three-dimensional bag, adding the antibacterial and antistatic agent and the toughening agent can effectively improve the antibacterial performance, antistatic performance, and toughness of the three-dimensional bag. The quaternary ammonium salt structure contained in the antibacterial and antistatic agent has excellent bactericidal effects. At the same time, the cations in the quaternary ammonium salt can form a conductive layer on the surface of the three-dimensional bag, dissipating static charges through ion migration. The polar groups contained in the antibacterial and antistatic agent neutralize local charges through intramolecular polarization, reducing static charge accumulation. The flexible network formed by grafting collagen onto polylactic acid can form a "soft-hard" synergistic structure with the rigid reinforcement of the modified microfibers, significantly enhancing the toughness of the three-dimensional bag through multiple energy dissipation mechanisms. Detailed implementation mode

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Example 1: This example discloses a preparation method of an antibacterial and antistatic agent, including the following steps:

[0034] Q1: Add 4.121 g of 3-bromobenzoic acid and 0.76 mL of propylene glycol into a closed container, heat and distill at 130 °C for 8 h. After the reaction, first wash with distilled water, and then wash with a methanol aqueous solution. The volume ratio of methanol to distilled water in the methanol aqueous solution is 80 mL:20 mL. Dissolve in chloroform and dry with anhydrous sodium sulfate, then rotary evaporate to obtain Compound 1;

[0035] Q2: Add 1.016 g of palmitoleic acid and 20 mL of toluene into a container, heat and react in an oil bath at 100 °C, and then dropwise add 1.446 mL of N,N-dibenzylethanolamine under stirring conditions. After the addition, raise the temperature to 150 °C and reflux for 18 h. After the reaction, perform vacuum distillation, recrystallize with petroleum ether, and dry in vacuum to obtain Compound 2;

[0036] Q3: Add 1.065 g of Compound 1 and 2.3 g of Compound 2 into a container filled with chloroform, heat, stir, and reflux at 65 °C for 12 h, then rotary evaporate, recrystallize with a mixed solution of acetone and distilled water with a volume ratio of 40:1, and dry in vacuum to obtain Compound 3;

[0037] Q4: Under a nitrogen atmosphere, 120 mL of absolute ethanol, 5.03 g of propylene, 6.5 g of 2-hydroxyethyl methacrylate, and 26.83 g of Compound 3 were successively added to a container equipped with a stirring device, a condensing reflux device, and a thermometer. After stirring at 250 rpm at room temperature, 0.35 g of azobisisobutyronitrile was added, and the temperature was slowly raised to 75 °C and reacted for 8 h. After the reaction, the temperature was lowered, rotary evaporation was carried out, concentration was carried out, precipitation was carried out, and vacuum drying was carried out at 80 °C for 24 h to obtain an antibacterial and antistatic agent.

[0038] This example discloses a preparation method of a modified toughening agent, comprising the following steps:

[0039] S1: 2.75 g of polylactic acid and 3.4 g of collagen were added to a container containing 5 mL of dimethyl sulfoxide. After stirring and dissolving, it was placed in a water bath environment at 20 °C. Under stirring conditions, 3 mL of dimethyl sulfoxide dissolved with 0.115 g of N,N'-dicyclohexylcarbodiimide was slowly added to the container, and the reaction was carried out for 12 h. After the reaction, it was poured into distilled water, and the precipitate was collected, washed, and dried to obtain modified polylactic acid;

[0040] S2: Wheat straw was washed, dried, crushed, and sieved to obtain pretreated straw. Then, 6.25 g of pretreated straw was added to 115 mL of a potassium hydroxide aqueous solution with a mass fraction of 15 wt%, and the reaction was carried out by heating at 90 °C for 2 h. After the reaction, it was cooled, mechanically stirred for 6 h, washed, filtered, and freeze-dried to obtain microfibers;

[0041] S3: 3.6 g of microfibers were added to 15 mL of sodium hypochlorite, stirred, taken out, and washed to obtain oxidized microfibers. 4 g of oxidized microfibers and 22.5 g of propionic acid were added to a container, soaked, and then 9.5 g of propionic anhydride and 0.025 mL of concentrated sulfuric acid were added. The reaction was carried out by heating and magnetic stirring at 100 °C for 3 h. After the reaction, deionized water was added, cooled, centrifuged, washed, and freeze-dried to obtain modified microfibers;

[0042] S4: 16 g of modified polylactic acid and 4 g of modified microfibers were melt-mixed. The melt-mixing temperatures were set at 160 °C, 165 °C, 175 °C, 185 °C, and 190 °C respectively, the mixing rotation speed was 110 rpm, and micro-melt spinning was carried out. During the micro-melt spinning process, the spinning temperature was 195 °C, the screw rotation speed was 35 rpm, and the winding speed was 20 m / min to obtain a modified toughening agent.

[0043] This example discloses an antistatic and antibacterial functional three-dimensional bag, which is composed of the following components in parts by weight: 77.5 parts of polyethylene, 5.5 parts of an antibacterial and antistatic agent, 3.5 parts of a modified toughening agent, 0.75 parts of an antioxidant, 0.8 parts of a lubricant, and 1.05 parts of a colorant.

[0044] This embodiment discloses a preparation method of an antistatic and antibacterial functional three-dimensional bag, comprising the following steps:

[0045] Step 1: Add polyethylene, antibacterial and antistatic agent, modified toughening agent, antioxidant, lubricant and colorant into a high-speed mixer for mixing to obtain a mixed material;

[0046] Step 2: Melt, extrude, granulate, cool, blow film, age, slit and thermoform the mixed material to obtain the antistatic and antibacterial functional three-dimensional bag.

[0047] Example 2: This embodiment discloses a preparation method of an antibacterial and antistatic agent, comprising the following steps:

[0048] Q1: Add 3.618 g of 3-bromobenzoic acid and 0.684 mL of propylene glycol into a sealed container, heat and distill at 130 °C for 8 h. After the reaction, first wash with distilled water, and then wash with a methanol aqueous solution with a volume ratio of methanol to distilled water of 80 mL:20 mL. Dissolve in chloroform and dry with anhydrous sodium sulfate, then rotary evaporate to obtain Compound 1;

[0049] Q2: Add 0.847 g of palmitoleic acid and 20 mL of toluene into a container, heat and react in an oil bath at 100 °C, then dropwise add 1.205 mL of N,N-dibenzylethanolamine dropwise under stirring conditions. After the addition, raise the temperature to 150 °C and reflux for 18 h. After the reaction, perform vacuum distillation, recrystallize with petroleum ether, and dry in vacuum to obtain Compound 2;

[0050] Q3: Add 0.852 g of Compound 1 and 1.86 g of Compound 2 into a container filled with chloroform, heat, stir and reflux at 65 °C for 12 h, then rotary evaporate, recrystallize with a mixed solution of acetone and distilled water with a volume ratio of 40:1, and dry in vacuum to obtain Compound 3;

[0051] Q4: Under a nitrogen atmosphere, add 110 mL of absolute ethanol, 4.82 g of propylene, 6.12 g of 2-hydroxyethyl methacrylate and 25.12 g of Compound 3 into a container equipped with a stirring device, a condensation reflux device and a thermometer in sequence. After stirring at room temperature at 250 rpm, add 0.26 g of azobisisobutyronitrile, slowly raise the temperature to 75 °C and react for 8 h. After the reaction, cool down, rotary evaporate, concentrate, precipitate, and dry in vacuum at 80 °C for 24 h to obtain the antibacterial and antistatic agent.

[0052] This embodiment discloses a preparation method of a modified toughening agent, comprising the following steps:

[0053] S1: Add 2 g of polylactic acid and 2 g of collagen into a container containing 5 mL of dimethyl sulfoxide. After stirring and dissolving, place it in a water bath environment at 20 °C. Under stirring conditions, slowly add 3 mL of dimethyl sulfoxide dissolved with 0.1 g of N,N'-dicyclohexylcarbodiimide into the container, react for 12 h. After the reaction is completed, pour it into distilled water, collect the precipitate, wash, and dry to obtain modified polylactic acid;

[0054] S2: Wash, dry, crush, and sieve wheat straw to obtain pretreated straw. Then add 5 g of pretreated straw into 100 mL of potassium hydroxide aqueous solution with a mass fraction of 15 wt%, heat and react at 90 °C for 2 h. After the reaction is completed, cool, mechanically stir for 6 h, wash, filter, and freeze-dry to obtain microfibers;

[0055] S3: Add 3 g of microfibers into 12 mL of sodium hypochlorite, stir, take out, and wash to obtain oxidized microfibers. Add 3 g of oxidized microfibers and 20 g of propionic acid into a container, soak, then add 6 g of propionic anhydride and 0.02 mL of concentrated sulfuric acid, heat and magnetically stir at 100 °C for 3 h. After the reaction is completed, add deionized water, cool, centrifuge, wash, and freeze-dry to obtain modified microfibers;

[0056] S4: Melt and mix 12 g of modified polylactic acid and 3 g of modified microfibers. The melt mixing temperatures are set at 160 °C, 165 °C, 175 °C, 185 °C, and 190 °C respectively, the mixing rotation speed is 110 rpm, and micro-melt spinning is carried out. During the micro-melt spinning process, the spinning temperature is 195 °C, the screw rotation speed is 35 rpm, and the winding speed is 20 m / min to obtain a modified toughening agent.

[0057] This example discloses an antistatic and antibacterial functional three-dimensional bag, which is composed of the following components in parts by weight: 70 parts of polyethylene, 3 parts of antibacterial and antistatic agent, 2 parts of modified toughening agent, 0.5 part of antioxidant, 0.5 part of lubricant, and 0.1 part of colorant.

[0058] This example discloses a preparation method of an antistatic and antibacterial functional three-dimensional bag, including the following steps:

[0059] Step 1: Add polyethylene, antibacterial and antistatic agent, modified toughening agent, antioxidant, lubricant, and colorant into a high-speed mixer for mixing to obtain a mixed material;

[0060] Step 2: Melt, extrude, granulate, cool, blow film, cure, slit, and thermoform the mixed material to obtain an antistatic and antibacterial functional three-dimensional bag.

[0061] Example 3: This example discloses a preparation method of an antibacterial and antistatic agent, including the following steps:

[0062] Q1: Add 4.623 g of 3-bromobenzoic acid and 0.836 mL of propylene glycol into a sealed container, heat and distill at 130 °C for 8 h. After the reaction, wash with distilled water first, and then wash with an aqueous methanol solution with a volume ratio of methanol to distilled water of 80 mL:20 mL. Dissolve in chloroform, dry with anhydrous sodium sulfate, and rotary evaporate to obtain Compound 1;

[0063] Q2: Add 1.185 g of palmitoleic acid and 20 mL of toluene into a container, heat and react in an oil bath at 100 °C, and then dropwise add 1.687 mL of N,N-dibenzylethanolamine dropwise under stirring. After the addition, raise the temperature to 150 °C and reflux for 18 h. After the reaction, perform vacuum distillation, recrystallize with petroleum ether, and dry in vacuum to obtain Compound 2;

[0064] Q3: Add 1.278 g of Compound 1 and 2.74 g of Compound 2 into a container containing chloroform, heat and stir under reflux at 65 °C for 12 h, rotary evaporate, recrystallize with a mixed solution of acetone and distilled water with a volume ratio of 40:1, and dry in vacuum to obtain Compound 3;

[0065] Q4: Under a nitrogen atmosphere, add 130 mL of absolute ethanol, 5.24 g of propylene, 6.88 g of 2-hydroxyethyl methacrylate, and 28.54 g of Compound 3 into a container equipped with a stirring device, a condenser reflux device, and a thermometer in sequence. Stir at 250 rpm at room temperature and then add 0.45 g of azobisisobutyronitrile. Slowly raise the temperature to 75 °C and react for 8 h. After the reaction, cool down, rotary evaporate, concentrate, precipitate, and dry in vacuum at 80 °C for 24 h to obtain the antibacterial and antistatic agent.

[0066] This example discloses a preparation method of a modified toughening agent, including the following steps:

[0067] S1: Add 3.5 g of polylactic acid and 4.8 g of collagen into a container containing 5 mL of dimethyl sulfoxide. After stirring and dissolving, place it in a water bath environment at 20 °C. Under stirring, slowly add 3 mL of dimethyl sulfoxide dissolved with 0.13 g of N,N-dicyclohexylcarbodiimide into the container and react for 12 h. After the reaction, pour it into distilled water, collect the precipitate, wash, and dry to obtain modified polylactic acid;

[0068] S2: Wash, dry, crush, and sieve wheat straw to obtain pretreated straw. Then add 7.5 g of pretreated straw into 130 mL of an aqueous potassium hydroxide solution with a mass fraction of 15 wt%, heat and react at 90 °C for 2 h. After the reaction, cool down, mechanically stir for 6 h, wash, filter, and freeze-dry to obtain microfibers;

[0069] S3: Add 4.2 g of microfibers to 18 mL of sodium hypochlorite, stir, take out, wash to obtain oxidized microfibers. Add 5 g of oxidized microfibers and 25 g of propionic acid to a container, soak, then add 13 g of propionic anhydride and 0.03 mL of concentrated sulfuric acid, heat with magnetic stirring at 100 °C for 3 h. After the reaction, add deionized water, cool, centrifuge, wash, and freeze-dry to obtain modified microfibers;

[0070] S4: Melt-mix 20 g of modified polylactic acid and 5 g of modified microfibers. The melt-mixing temperatures are set at 160 °C, 165 °C, 175 °C, 185 °C, and 190 °C respectively, the mixing rotation speed is 110 rpm, and micro-melt spinning is carried out. During the micro-melt spinning process, the spinning temperature is 195 °C, the screw rotation speed is 35 rpm, and the winding speed is 20 m / min to obtain a modified toughening agent.

[0071] This example discloses an antistatic and antibacterial functional three-dimensional bag, which is composed of the following components in parts by weight: 85 parts of polyethylene, 8 parts of antibacterial and antistatic agent, 5 parts of modified toughening agent, 1 part of antioxidant, 1.1 parts of lubricant, and 2 parts of colorant.

[0072] This example discloses a preparation method of an antistatic and antibacterial functional three-dimensional bag, including the following steps:

[0073] Step 1: Add polyethylene, antibacterial and antistatic agent, modified toughening agent, antioxidant, lubricant, and colorant to a high-speed mixer for mixing to obtain a mixed material;

[0074] Step 2: Melt, extrude, granulate, cool, blow film, cure, slit, and thermoform the mixed material to obtain an antistatic and antibacterial functional three-dimensional bag.

[0075] Example 4: This example discloses a preparation method of an antibacterial and antistatic agent, including the following steps:

[0076] Q1: Add 3.871 g of 3-bromobenzoic acid and 0.722 mL of propylene glycol to a sealed container, heat and distill at 130 °C for 8 h. After the reaction, first wash with distilled water, and then wash with a methanol aqueous solution. The volume ratio of methanol to distilled water in the methanol aqueous solution is 80 mL:20 mL. Dissolve in chloroform and dry with anhydrous sodium sulfate, then rotary evaporate to obtain Compound 1;

[0077] Q2: Add 0.916 g of palmitoleic acid and 20 mL of toluene to a container, heat and react in an oil bath at 100 °C, then dropwise add 1.325 mL of N,N-dibenzylethanolamine dropwise under stirring. After the addition, raise the temperature to 150 °C and reflux for 18 h. After the reaction, carry out vacuum distillation, recrystallize with petroleum ether, and dry in vacuum to obtain Compound 2;

[0078] Q3: Add 0.953 g of Compound 1 and 1.95 g of Compound 2 into a container filled with chloroform, heat and stir under reflux at 65 °C for 12 h, rotary evaporate, recrystallize with a mixed solution of acetone and distilled water with a volume ratio of 40:1, and vacuum dry to obtain Compound 3;

[0079] Q4: Under a nitrogen atmosphere, add 105 mL of absolute ethanol, 4.92 g of propylene, 6.31 g of 2-hydroxyethyl methacrylate, and 25.63 g of Compound 3 into a container equipped with a stirring device, a condensing reflux device, and a thermometer in sequence. After stirring at 250 rpm at room temperature, add 0.31 g of azobisisobutyronitrile, slowly heat up to 75 °C and react for 8 h. After the reaction, cool down, rotary evaporate, concentrate, precipitate, and vacuum dry at 80 °C for 24 h to obtain the antibacterial and antistatic agent.

[0080] This example discloses a preparation method of a modified toughening agent, which includes the following steps:

[0081] S1: Add 2.4 g of polylactic acid and 2.7 g of collagen into a container filled with 5 mL of dimethyl sulfoxide. After stirring and dissolving, place it in a water bath environment at 20 °C. Under stirring conditions, slowly add 3 mL of dimethyl sulfoxide dissolved with 0.12 g of N,N'-dicyclohexylcarbodiimide into the container, react for 12 h. After the reaction, pour it into distilled water, collect the precipitate, wash, and dry to obtain modified polylactic acid;

[0082] S2: Wash, dry, crush, and sieve wheat straw to obtain pretreated straw. Then add 5.5 g of pretreated straw into 110 mL of a potassium hydroxide aqueous solution with a mass fraction of 15 wt%, heat and react at 90 °C for 2 h. After the reaction, cool down, mechanically stir for 6 h, wash, filter, and freeze-dry to obtain microfibers;

[0083] S3: Add 3.3 g of microfibers into 13 mL of sodium hypochlorite, stir, take out, and wash to obtain oxidized microfibers. Add 3.5 g of oxidized microfibers and 21 g of propionic acid into a container, soak, then add 8 g of propionic anhydride and 0.021 mL of concentrated sulfuric acid, heat and magnetically stir at 100 °C for 3 h. After the reaction, add deionized water, cool down, centrifuge, wash, and freeze-dry to obtain modified microfibers;

[0084] S4: Melt and mix 14 g of modified polylactic acid and 3.5 g of modified microfibers. The melt mixing temperatures are set at 160 °C, 165 °C, 175 °C, 185 °C, and 190 °C respectively, the mixing rotation speed is 110 rpm, and micro-melt spinning is carried out. During the micro-melt spinning process, the spinning temperature is 195 °C, the screw rotation speed is 35 rpm, and the winding speed is 20 m / min to obtain the modified toughening agent.

[0085] This embodiment discloses an antistatic and antibacterial functional three-dimensional bag, which is composed of the following components in parts by weight: 75 parts of polyethylene, 4 parts of antibacterial and antistatic agent, 3 parts of modified toughening agent, 0.6 parts of antioxidant, 0.6 parts of lubricant, and 0.8 parts of colorant.

[0086] This embodiment discloses a preparation method of an antistatic and antibacterial functional three-dimensional bag, which includes the following steps:

[0087] Step 1: Add polyethylene, antibacterial and antistatic agent, modified toughening agent, antioxidant, lubricant, and colorant into a high-speed mixer for mixing to obtain a mixed material;

[0088] Step 2: Melt, extrude, granulate, cool, blow film, age, slit, and thermoform the mixed material to obtain an antistatic and antibacterial functional three-dimensional bag.

[0089] Comparative Example 1: Compared with Example 1, in the process of preparing the antistatic and antibacterial functional three-dimensional bag in Comparative Example 1, the antibacterial and antistatic agent is not added, and other conditions remain unchanged.

[0090] Comparative Example 2: Compared with Example 1, in the process of preparing the antistatic and antibacterial functional three-dimensional bag in Comparative Example 2, the modified toughening agent is not added, and other conditions remain unchanged.

[0091] Experimental Example: Perform performance tests on the three-dimensional bags prepared in Examples 1-4 and Comparative Examples 1-2. Test the antibacterial performance of the samples according to GB / T31402-2023, test the antistatic performance of the samples according to GB / T 37977.48-2023, and test the tensile performance of the samples according to GB / T 1040.3-2006. The test results are shown in Table 1:

[0092] Table 1

[0093]

[0094] The smaller the surface resistance, the less surface static electricity dissipation, and the worse the antistatic effect. It can be seen from the test results in Table 1 that the antistatic and antibacterial functional three-dimensional bags prepared in Examples 1-4 of the present invention have excellent antibacterial performance, antistatic performance, and toughness. By comparing Comparative Example 1 with Examples 1-4, it can be known that the addition of the antibacterial and antistatic agent can effectively improve the antibacterial performance and antistatic performance of the three-dimensional bag; by comparing Comparative Example 2 with Examples 1-4, it can be known that the addition of the modified toughening agent can effectively improve the toughness of the three-dimensional bag.

[0095] As described above, only the preferred specific embodiments of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered within the protection scope of the present invention.

[0096] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific embodiments. Obviously, according to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. Antistatic and antibacterial functional three-dimensional bag, characterized by: The invention is composed of the following components in parts by weight: 70-85 parts of polyethylene, 3-8 parts of antibacterial and antistatic agents, 2-5 parts of modified toughening agents, 0.5-1 parts of antioxidants, 0.5-1.1 parts of lubricants, and 0.1-2 parts of colorants, wherein the antibacterial and antistatic agents are prepared from 3-bromobenzoic acid, propylene glycol, palmitoleic acid, propylene and hydroxyethyl methacrylate, and the toughening agents are prepared from polylactic acid, collagen, wheat straw, propionic acid and propionic anhydride.

2. The antistatic and antibacterial functional three-dimensional bag according to claim 1, characterized in that: The preparation method of the antibacterial and antistatic agent comprises the following steps: Q1: Add 3-bromobenzoic acid and propylene glycol into a sealed container, heat and distill to react, and after the reaction is completed, wash, dissolve, dry, and rotary evaporate to obtain compound 1; Q2: Add palmitic acid and toluene to a container, heat in an oil bath for reaction, then add N,N-dibenzylethanolamine dropwise under stirring, raise the temperature to reflux for reaction after the addition is complete, and after the reaction is complete, perform vacuum distillation, recrystallization, and vacuum drying to obtain compound 2; Q3: Compound 1 and Compound 2 were added to a container filled with chloroform, heated and stirred to reflux for reaction, rotary evaporated, recrystallized, and vacuum dried to obtain Compound 3; Q4: Under a nitrogen atmosphere, add anhydrous ethanol, propylene, hydroxyethyl methacrylate and compound 3 in sequence to a container equipped with a stirring device, a condensing reflux device and a thermometer, add azobisisobutyronitrile after stirring at room temperature, slowly raise the temperature to react, and after the reaction is completed, cool down, rotary evaporate, concentrate, precipitate, and vacuum dry to obtain an antibacterial and antistatic agent.

3. The antistatic and antibacterial functional three-dimensional bag according to claim 2, characterized in that: In the Q1, the molar ratio of 3-bromobenzoic acid and propylene glycol is (1.8-2.3): (0.9-1.1), the heating distillation reaction temperature is 120-150°C, the reaction time is 6-8h, and it is first washed with distilled water and then washed with methanol aqueous solution. The volume ratio of methanol and distilled water in the methanol aqueous solution is (80-100): (20-25), and then dissolved in chloroform and dried with anhydrous sodium sulfate.

4. The antistatic and antibacterial functional three-dimensional bag according to claim 2, characterized in that: In Q2, the molar ratio of palmitic acid to N,N-dibenzylethanolamine is (1-1.4):(1.5-2.1), the oil bath heating reaction temperature is 90-110°C, the reflux reaction temperature is 150-160°C, the reflux reaction time is 14-18h, and recrystallization is performed using petroleum ether.

5. The antistatic and antibacterial functional three-dimensional bag according to claim 2, characterized in that: In the Q3, the molar ratio of compound 1 to compound 2 is (1-1.5): (1.9-2.8), the heating stirring reflux reaction temperature is 60-70°C, the reaction time is 8-12h, and recrystallization is carried out using a mixed solution of acetone and distilled water with a volume ratio of 40:1; in the Q4, the amount ratio of anhydrous ethanol, propylene, hydroxyethyl methacrylate, compound 3 and azobisisobutyronitrile is (110-130) mL: (4.82-5.24) g: (6.12-6.88) g: (25.12-28.54) g: (0.26-0.45) g, the room temperature stirring speed is 200-250 rpm, the heating reaction temperature is 70-80°C, the reaction time is 6-8h, and the vacuum drying temperature is 75-85°C for 20-24h.

6. The antistatic and antibacterial functional three-dimensional bag according to claim 1, characterized in that: The preparation method of the modified toughening agent comprises the following steps: S1: adding polylactic acid and collagen to a container containing dimethyl sulfoxide, stirring and dissolving, and then placing in a water bath environment, under stirring conditions, slowly adding dimethyl sulfoxide containing N,N-dicyclohexylcarbodiimide to the container for reaction, and after the reaction is completed, pouring into distilled water, collecting the precipitate, washing, and drying to obtain modified polylactic acid; S2: washing, drying, crushing and sieving the wheat straw to obtain pretreated straw, then adding the pretreated straw to a potassium hydroxide aqueous solution, heating for reaction, cooling, mechanically stirring, washing, filtering and freeze-drying after the reaction to obtain microfibers; S3: adding the microfibers to sodium hypochlorite, stirring, taking out, washing, and obtaining oxidized microfibers; adding the oxidized microfibers and propionic acid to a container, soaking, and then adding propionic anhydride and concentrated sulfuric acid, heating and magnetic stirring to react; after the reaction is completed, adding deionized water, cooling, centrifuging, washing, and freeze-drying to obtain modified microfibers; S4: melt-mixing the modified polylactic acid and the modified microfibers, and performing micro-melt spinning to obtain a modified toughening agent.

7. The antistatic and antibacterial functional three-dimensional bag according to claim 6, characterized in that: In the S1, the dosage ratio of polylactic acid, collagen and N,N-dicyclohexylcarbodiimide is (2-3.5) g: (2-4.8) g: (0.1-0.13) g, the water bath environment temperature is 18-22° C., and the reaction time is 12-14 h. In the S2, the dosage ratio of pretreated straw and potassium hydroxide aqueous solution is (5-7.5) g: (100-130) mL, the mass fraction of potassium hydroxide aqueous solution is 15 wt %, the heating reaction temperature is 90-95° C., the reaction time is 1-2 h, and the mechanical stirring time is 4-6 h.

8. The antistatic and antibacterial functional three-dimensional bag according to claim 6, characterized in that: In S3, the dosage ratio of microfibers and sodium hypochlorite is (3-4.2) g: (12-18) mL, the dosage ratio of oxidized microfibers, propionic acid, propionic anhydride and concentrated sulfuric acid is (3-5) g: (20-25) g: (6-13) g: (0.02-0.03) mL, the heating magnetic stirring reaction temperature is 90-110° C., and the reaction time is 2-3 h. In S4, the dosage ratio of modified polylactic acid and modified microfibers is (12-20) g: (3-5) g, the melt mixing temperatures are set to 160° C., 165° C., 175° C., 185° C. and 190° C., respectively, the mixing speed is 100-110 rpm, the spinning temperature during micro melt spinning is 190-195° C., the screw speed is 30-45 rpm, and the winding speed is 20-24 m / min.

9. The method for preparing the antistatic and antibacterial functional three-dimensional bag according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: adding polyethylene, antibacterial and antistatic agent, modified toughening agent, antioxidant, lubricant and colorant into a high-speed mixer for mixing to obtain a mixture; Step 2: The mixed material is melted, extruded, granulated, cooled, film-blown, aged, cut, and thermally synthesized to obtain an antistatic and antibacterial functional three-dimensional bag.

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