Anti-aging butyronitrile glove and preparation method thereof

Abstract

The invention relates to the technical field of rubber glove production, and discloses an anti-aging butyronitrile glove and a preparation method thereof.The anti-aging butyronitrile glove is prepared from, by weight, 90-100 parts of butyronitrile latex, 1-3 parts of modified sericite, 1-3 parts of modified nano-zinc oxide, 3-5 parts of vulcanizing agent, 0.5-2 parts of accelerant, 0.1-0.5 part of surfactant and 60-80 parts of deionized water; the modified sericite is obtained by modifying sericite through chitosan intercalation, complexing the sericite with silver ions and reducing the sericite into nano-silver; the modified sericite and the modified nano-zinc oxide are added into the formula of the anti-aging butyronitrile glove, the modified sericite and the modified nano-zinc oxide have a synergistic effect, aging inducements such as heat and light can be completely covered, and the anti-aging butyronitrile glove has the advantages that the anti-aging coupling agent is grafted on the surface of nano-zinc oxide, so that the anti-aging butyronitrile glove has the anti-aging function, and the anti-aging performance of the anti-aging butyronitrile glove is improved. The anti-aging life of the butyronitrile gloves is obviously prolonged, and meanwhile, the butyronitrile gloves have good antibacterial property.

Description

Technical Field

[0001] This invention belongs to the field of rubber glove production technology, specifically relating to an anti-aging nitrile glove and its preparation method. Background Technology

[0002] Nitrile gloves are synthetic rubber protective gloves made primarily of nitrile rubber through processes such as dipping and molding. As a synthetic material, nitrile gloves do not contain the allergenic proteins found in natural latex, effectively avoiding latex allergy problems. Simultaneously, the acrylonitrile segments in the nitrile rubber molecular structure give it excellent oil and chemical resistance, while the butadiene segments provide good elasticity and flexibility, resulting in a combination of tensile strength and a good fit. Therefore, nitrile gloves are widely used in medical care, food processing, industrial operations, and laboratory research, primarily for hand protection, isolating hands from direct contact with contaminants, chemicals, and microorganisms, ensuring operational safety and hygiene.

[0003] Because nitrile rubber (NBR) contains molecular chains with double bonds in its chemical structure, and these double bonds have low bond energies, they are easily broken by external factors, causing NBR to rapidly lose its properties and affecting the performance of NBR gloves. Therefore, antioxidants need to be added to NBR to improve its aging resistance and prepare polymerically stabilized NBR. However, antioxidants in NBR tend to agglomerate or be unevenly distributed, and they are prone to migration and volatilization during the use and processing of the rubber, leading to a significant decrease in the aging resistance of NBR. Summary of the Invention

[0004] To address the shortcomings mentioned in the background art, the present invention aims to provide an anti-aging nitrile glove and its preparation method. The anti-aging nitrile glove formula includes modified sericite and modified nano zinc oxide. The two work synergistically to comprehensively cover aging factors such as heat and light, significantly improve the anti-aging life of the nitrile glove, and also have good antibacterial properties.

[0005] The objective of this invention can be achieved through the following technical solutions: An anti-aging nitrile glove comprises the following raw materials in parts by weight: 90-100 parts nitrile latex, 1-3 parts modified sericite, 1-3 parts modified nano zinc oxide, 3-5 parts vulcanizing agent, 0.5-2 parts accelerator, 0.1-0.5 parts surfactant, and 60-80 parts deionized water; Modified sericite is sericite that has been modified by chitosan intercalation, which then complexes silver ions and reduces them to nano-silver. Modified nano zinc oxide is a nano zinc oxide surface grafted with an anti-aging coupling agent, which is obtained by reacting an amino-containing anti-aging agent with an isocyanate-based silane.

[0006] Preferably, the vulcanizing agent is sulfur, the accelerator is a mixture of N-cyclohexyl-2-benzothiazole sulfenamide and zinc dimethyl dithiocarbamate in a mass ratio of 4:1, and the surfactant is one of sodium dodecylbenzenesulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, and sodium lauryl sulfate.

[0007] Preferably, the preparation method of modified sericite includes the following steps: (1) Add sericite to deionized water and disperse it by ultrasonication. Add chitosan to 2 vol% acetic acid solution and stir to dissolve. Then slowly add the chitosan solution to the sericite dispersion, sonicate for 3-5 hours, centrifuge, wash and dry to obtain chitosan-intercalated sericite. (2) Prepare 0.1 mol / L silver nitrate solution and 0.1 mol / L sodium citrate solution with deionized water respectively. Add chitosan-intercalated sericite to deionized water and disperse by ultrasonication. Add silver nitrate solution to chitosan-intercalated sericite dispersion. Stir at 70~80℃ for 2~4 h. Then add sodium citrate solution and continue stirring for 18~24 h. After filtration, washing and drying, modified sericite is obtained.

[0008] Preferably, the mass ratio of sericite to chitosan is 1:0.5~0.8, and the mass ratio of chitosan-intercalated sericite, silver nitrate and sodium citrate is 1:0.2~0.4:0.2~0.4.

[0009] Preferably, the preparation method of modified nano zinc oxide includes the following steps: A. Add 4-aminodiphenylamine to toluene and heat to 60°C with stirring to completely dissolve the aminodiphenylamine. Under a nitrogen atmosphere, slowly add dibutyltin dilaurate and propyltriethoxysilane 3-isocyanate. Heat to 80°C and keep the temperature for 4-6 hours. After the reaction is completed, cool to room temperature and remove toluene by vacuum distillation to obtain the anti-aging coupling agent. B. Add nano zinc oxide to an ethanol / water mixture and ultrasonically disperse for 5-10 minutes. Then slowly add an anti-aging coupling agent and continue ultrasonic dispersion for 5-10 minutes. Heat to 80°C and keep the temperature for 3-5 hours. After cooling, filter, wash, and dry to obtain modified nano zinc oxide.

[0010] Preferably, the molar ratio of 4-aminodiphenylamine and 3-isocyanate propyltriethoxysilane is 1:1 to 1.2, and the amount of dibutyltin dilaurate is 0.2 to 0.3% of the total mass of 4-aminodiphenylamine and 3-isocyanate propyltriethoxysilane.

[0011] Preferably, the mass ratio of nano zinc oxide to anti-aging coupling agent is 3~5:1.

[0012] A method for preparing an anti-aging nitrile glove includes the following steps: S1. Mix nitrile latex, modified sericite, modified nano zinc oxide, vulcanizing agent, accelerator, surfactant, and deionized water, and stir at a rate of 200~300 r / min for 20~24 h to obtain a slurry; S2. Clean and dry the glove mold, immerse it in the release agent solution and then drip dry it. Then immerse it in the slurry and drip dry it. Repeat this process 1-2 times. After hemming, vulcanizing, cleaning, and drying, demold the glove to obtain anti-aging nitrile gloves.

[0013] The beneficial effects of this invention are: The anti-aging nitrile glove formulation of this invention incorporates modified sericite and modified nano-zinc oxide. Modified sericite primarily enhances the mechanical properties and thermal aging resistance of nitrile gloves through physical reinforcement and the thermo-oxidative stabilization effect of nano-silver, while also imparting antibacterial properties. Modified nano-zinc oxide dominates the anti-photoaging performance through ultraviolet absorption and the free radical scavenging effect of the anti-aging coupling agent, and synergistically enhances thermal aging stability. When the two work synergistically, they can comprehensively cover aging factors such as heat and light, significantly improving the anti-aging lifespan of nitrile gloves, while also exhibiting good antibacterial properties. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0015] Example 1: A method for preparing modified sericite includes the following steps: (1) Add 10g of sericite to 200mL of deionized water and disperse by ultrasonication. Add 6.5g of chitosan to 100mL of 2vol% acetic acid solution and stir to dissolve. Then slowly add the chitosan solution to the sericite dispersion, sonicate for 4h, centrifuge, wash and dry to obtain chitosan-intercalated sericite. (2) Prepare 0.1 mol / L silver nitrate solution and 0.1 mol / L sodium citrate solution with deionized water respectively. Add 10 g of chitosan-intercalated sericite to 200 mL of deionized water and disperse by ultrasonication. Add 180 mL of silver nitrate solution to the chitosan-intercalated sericite dispersion. Stir and react at 70~80℃ for 2~4 h. Then add 140 mL of sodium citrate solution and continue stirring and reacting for 20 h. After filtration, washing and drying, the modified sericite is obtained.

[0016] Example 2: A method for preparing modified nano zinc oxide includes the following steps: A. Add 20g of 4-aminodiphenylamine to 200mL of toluene and heat to 60℃ with stirring to completely dissolve the aminodiphenylamine. Under a nitrogen atmosphere, slowly add 0.1g of dibutyltin dilaurate and 22.7g of propyltriethoxysilane 3-isocyanate. Heat to 80℃ and maintain the temperature for 5h. After the reaction is completed, cool to room temperature and remove toluene by vacuum distillation to obtain the anti-aging coupling agent. B. Add 10g of nano zinc oxide to a 90mL ethanol / 10mL water mixture, sonicate for 8min, then slowly add 2.5g of anti-aging coupling agent, continue sonication for 8min, heat to 80℃ and keep the reaction for 4h, cool, filter, wash and dry to obtain modified nano zinc oxide.

[0017] Example 3: An anti-aging nitrile glove, comprising the following raw materials in parts by weight: 90 parts nitrile latex, 3 parts modified sericite, 1 part modified nano zinc oxide, 5 parts sulfur, 0.4 parts N-cyclohexyl-2-benzothiazole sulfenamide, 0.1 parts zinc dimethyl dithiocarbamate, 0.5 parts sodium lauryl sulfate, and 60 parts deionized water; the modified sericite was prepared in Example 1; the modified nano zinc oxide was prepared in Example 2.

[0018] The preparation method of the above-mentioned anti-aging nitrile gloves includes the following steps: S1. Mix nitrile latex, modified sericite, modified nano zinc oxide, sulfur, N-cyclohexyl-2-benzothiazole sulfenamide, zinc dimethyl dithiocarbamate, sodium lauryl sulfate, and deionized water, and stir at 300 r / min for 20 h to obtain a slurry. S2. Clean and dry the glove mold, immerse it in the release agent solution and then drip dry it, then immerse it in the slurry and drip dry it. Repeat this process 1-2 times. After hemming, vulcanizing, cleaning, drying, and demolding, the anti-aging nitrile gloves are obtained.

[0019] Example 4: An anti-aging nitrile glove, comprising the following raw materials in parts by weight: 100 parts nitrile latex, 1 part modified sericite, 3 parts modified nano zinc oxide, 3 parts sulfur, 1.6 parts N-cyclohexyl-2-benzothiazole sulfenamide, 0.4 parts zinc dimethyl dithiocarbamate, 0.1 parts sodium fatty alcohol polyoxyethylene ether sulfate, and 80 parts deionized water; the modified sericite was prepared in Example 1; the modified nano zinc oxide was prepared in Example 2.

[0020] The preparation method of the above-mentioned anti-aging nitrile gloves includes the following steps: S1. Mix nitrile latex, modified sericite, modified nano zinc oxide, sulfur, N-cyclohexyl-2-benzothiazole sulfenamide, zinc dimethyl dithiocarbamate, sodium fatty alcohol polyoxyethylene ether sulfate, and deionized water, and stir at 200 r / min for 24 h to obtain a slurry. S2. Clean and dry the glove mold, immerse it in the release agent solution and then drip dry it, then immerse it in the slurry and drip dry it. Repeat this process 1-2 times. After hemming, vulcanizing, cleaning, drying, and demolding, the anti-aging nitrile gloves are obtained.

[0021] Example 5: An anti-aging nitrile glove, comprising the following raw materials in parts by weight: 95 parts nitrile latex, 2 parts modified sericite, 2 parts modified nano zinc oxide, 4 parts sulfur, 0.96 parts N-cyclohexyl-2-benzothiazole sulfenamide, 0.24 parts zinc dimethyl dithiocarbamate, 0.3 parts sodium dodecylbenzenesulfonate, and 70 parts deionized water; the modified sericite was prepared in Example 1; the modified nano zinc oxide was prepared in Example 2.

[0022] The preparation method of the above-mentioned anti-aging nitrile gloves includes the following steps: S1. Mix nitrile latex, modified sericite, modified nano zinc oxide, sulfur, N-cyclohexyl-2-benzothiazole sulfenamide, zinc dimethyl dithiocarbamate, sodium dodecylbenzenesulfonate, and deionized water, and stir at 250 r / min for 22 h to obtain a slurry. S2. Clean and dry the glove mold, immerse it in the release agent solution and then drip dry it, then immerse it in the slurry and drip dry it. Repeat this process 1-2 times. After hemming, vulcanizing, cleaning, drying, and demolding, the anti-aging nitrile gloves are obtained.

[0023] Comparative Example 1: An anti-aging nitrile glove, comprising the following raw materials in parts by weight: 95 parts nitrile latex, 2 parts modified nano zinc oxide, 4 parts sulfur, 0.96 parts N-cyclohexyl-2-benzothiazole sulfenamide, 0.24 parts zinc dimethyl dithiocarbamate, 0.3 parts sodium dodecylbenzenesulfonate, and 70 parts deionized water; the modified nano zinc oxide was prepared in Example 2.

[0024] The preparation method of the above-mentioned anti-aging nitrile gloves includes the following steps: S1. Mix nitrile latex, modified nano zinc oxide, sulfur, N-cyclohexyl-2-benzothiazole sulfenamide, zinc dimethyl dithiocarbamate, sodium dodecylbenzenesulfonate, and deionized water, and stir at 250 r / min for 22 h to obtain a slurry. S2. Clean and dry the glove mold, immerse it in the release agent solution and then drip dry it, then immerse it in the slurry and drip dry it. Repeat this process 1-2 times. After hemming, vulcanizing, cleaning, drying, and demolding, the anti-aging nitrile gloves are obtained.

[0025] Comparative Example 2: An anti-aging nitrile glove, comprising the following raw materials in parts by weight: 95 parts nitrile latex, 2 parts modified sericite, 4 parts sulfur, 0.96 parts N-cyclohexyl-2-benzothiazole sulfenamide, 0.24 parts zinc dimethyl dithiocarbamate, 0.3 parts sodium dodecylbenzenesulfonate, and 70 parts deionized water; the modified sericite was prepared in Example 1.

[0026] The preparation method of the above-mentioned anti-aging nitrile gloves includes the following steps: S1. Mix nitrile latex, modified sericite, sulfur, N-cyclohexyl-2-benzothiazole sulfenamide, zinc dimethyl dithiocarbamate, sodium dodecylbenzenesulfonate, and deionized water, and stir at 250 r / min for 22 h to obtain a slurry. S2. Clean and dry the glove mold, immerse it in the release agent solution and then drip dry it, then immerse it in the slurry and drip dry it. Repeat this process 1-2 times. After hemming, vulcanizing, cleaning, drying, and demolding, the anti-aging nitrile gloves are obtained.

[0027] Comparative Example 3: An anti-aging nitrile glove, comprising the following raw materials in parts by weight: 95 parts nitrile latex, 4 parts sulfur, 0.96 parts N-cyclohexyl-2-benzothiazole sulfenamide, 0.24 parts zinc dimethyl dithiocarbamate, 0.3 parts sodium dodecylbenzenesulfonate, and 70 parts deionized water.

[0028] The preparation method of the above-mentioned anti-aging nitrile gloves includes the following steps: S1. Mix nitrile latex sulfur, N-cyclohexyl-2-benzothiazole sulfenamide, zinc dimethyl dithiocarbamate, sodium dodecylbenzenesulfonate, and deionized water, and stir at 250 r / min for 22 h to obtain a slurry. S2. Clean and dry the glove mold, immerse it in the release agent solution and then drip dry it, then immerse it in the slurry and drip dry it. Repeat this process 1-2 times. After hemming, vulcanizing, cleaning, drying, and demolding, the anti-aging nitrile gloves are obtained.

[0029] Performance testing Ten intact gloves were randomly selected from the anti-aging nitrile gloves prepared in Examples 3-5 and Comparative Examples 1-3. Samples were cut from the palm area (a region of uniform thickness), avoiding edges and defective areas, and the following tests were performed: (1) Mechanical property testing Tensile strength, elongation at break and hardness were tested in accordance with GB / T32103-2015 standard. Dumbbell-shaped specimens were used for tensile performance testing, and 6mm thick laminated specimens were used for hardness testing (if the thickness of a single glove is insufficient, 2 to 3 layers can be stacked). The data are shown in Table 1 below.

[0030] Table 1

[0031] (2) Air aging resistance test Accelerated aging and heat resistance tests were conducted in accordance with GB / T3512-2014 standard. The samples were suspended in the hot air aging test chamber and aged at 100±2℃ for 72h. After aging, the samples were taken out and placed in an environment of (23±2)℃ and (50±5)% humidity for 24h. The tensile strength and hardness after aging were measured, and the tensile strength retention rate and hardness change value were calculated. The data are shown in Table 2 below.

[0032] Table 2

[0033] (3) Ultraviolet aging performance test The ultraviolet aging test was conducted according to GB / T16422.3-2014 standard, and the yellowing index was tested according to GB / T2409-2021 standard. The sample was laid flat on the sample rack of the fluorescent ultraviolet aging test chamber and continuously irradiated with 340nm ultraviolet light for 168h. The tensile strength and color value before and after aging were measured, and the tensile strength retention rate, elongation at break retention rate and yellowing index were calculated. The data are shown in Table 3 below.

[0034] Table 3

[0035] (4) Antibacterial performance test Antimicrobial performance was tested according to GB / T20944.3-2008 standard. The antimicrobial effect was evaluated by quantitatively determining the inhibition rate of the samples against bacteria. *Escherichia coli* and *Staphylococcus aureus* were selected as test strains. 4cm × 4cm samples were cut and placed in sterile petri dishes, then autoclaved at 121℃ for 20 minutes and cooled before use. The preserved *E. coli* and *Staphylococcus aureus* were inoculated onto nutrient agar medium and incubated at 37℃ for 24 hours. Single colonies were picked and transferred to nutrient broth medium and incubated with shaking at 37℃ for 18 hours to obtain bacterial suspensions. The bacterial suspensions were diluted to 1.0 × 10⁻⁶ with 0.85% sterile physiological saline. 5 CFU / mL, completely immerse the sterilized sample in the bacterial solution, and incubate at 37℃ and 150 rpm for 24 h. After incubation, take 1 mL of bacterial solution from each flask and serially dilute with sterile physiological saline (10 CFU / mL). -1 ~10 -4 Take 0.1 mL of bacterial solution of each dilution, spread it evenly on nutrient agar plates, incubate at 37℃ for 24 h, count the number of colonies on the plates, and calculate the antibacterial rate. The inhibition rate (%) = [(number of viable bacteria in blank control group - number of viable bacteria in sample group) / number of viable bacteria in blank control group] × 100%. The data are shown in Table 4 below.

[0036] Table 4

[0037] As can be seen from the data in Tables 1-3, compared with Comparative Example 1 (lacking modified sericite), the original mechanical properties (tensile strength and elongation) of Comparative Example 1 are slightly lower, and the retention rate of strength / elongation after heat aging decreases more significantly (approximately 10-15% lower), with a greater change in hardness. This is because after chitosan intercalation, the layered structure of the modified sericite can be uniformly dispersed in the latex, enhancing the mechanical strength of the rubber network through a "reinforcing effect." Furthermore, the interlayered silver nanoparticles can inhibit free radicals generated by thermal oxidation, delaying the breakage of rubber molecular chains, thereby improving thermal aging stability.

[0038] Compared with Examples 3-5, Comparative Example 2 (lacking modified nano-zinc oxide), the yellowing index of Comparative Example 2 after UV aging was significantly increased, and the strength retention rate decreased by approximately 5-8%. Nano-zinc oxide itself is a highly efficient UV absorber, capable of blocking 300-400nm UV rays (one of the main causes of rubber aging); its surface-grafted anti-aging coupling agent (containing diphenylamine groups) can capture free radicals generated by photo-oxidation, forming a dual anti-photoaging mechanism of "physical shielding + chemical anti-oxidation," which is the core component for inhibiting UV aging. The thermal aging performance of Comparative Example 2 was slightly lower than that of Examples 3-5 (but higher than that of Comparative Example 1), indicating that the anti-aging coupling agent of modified nano-zinc oxide can synergistically work with the vulcanization system to help improve the thermal aging retention rate by stabilizing the rubber crosslinking structure.

[0039] Comparing Examples 3-5 with Comparative Example 3 (both lacking), the anti-aging indicators of Examples 3-5 were significantly better than those of Comparative Example 3, and the original mechanical properties were significantly improved. This indicates that the "reinforcement + thermo-oxidative stabilization" of modified sericite and the "UV protection + free radical capture" of modified nano zinc oxide complement each other, covering the main aging pathways such as thermal aging and photoaging. The modification processes of both (chitosan intercalation and coupling agent grafting) improved the compatibility with nitrile latex, avoiding local aging defects caused by inorganic powder agglomeration, and making the anti-aging effect uniform and efficient.

[0040] As shown in Table 4, Examples 3-5 all achieved antibacterial rates of over 99% against both bacteria, while Comparative Example 1 (lacking modified sericite) and Comparative Example 3 (lacking both) showed antibacterial rates of only 10%-15% (close to blank, as nitrile latex itself has no antibacterial properties). This indicates that the antibacterial performance is entirely attributable to the nano-silver in the modified sericite. The nano-silver achieves highly efficient sterilization by disrupting the bacterial cell membrane and inhibiting its DNA replication. The antibacterial rate of Comparative Example 2 (lacking only modified nano-zinc oxide) was close to that of Examples 3-5, indicating that the modified nano-zinc oxide does not participate in the antibacterial effect, further confirming that the sole source of the antibacterial function is the modified sericite.

[0041] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An anti-aging nitrile glove, characterized in that, The raw materials include the following parts by weight: 90-100 parts of nitrile latex, 1-3 parts of modified sericite, 1-3 parts of modified nano zinc oxide, 3-5 parts of vulcanizing agent, 0.5-2 parts of accelerator, 0.1-0.5 parts of surfactant, and 60-80 parts of deionized water; The modified sericite is sericite that has been modified by chitosan intercalation, then complexed with silver ions and reduced to nano-silver. The modified nano zinc oxide is a nano zinc oxide surface grafted with an anti-aging coupling agent, which is obtained by reacting an amino-containing anti-aging agent with an isocyanate-based silane.

2. The anti-aging nitrile glove according to claim 1, characterized in that, The vulcanizing agent is sulfur, the accelerator is a mixture of N-cyclohexyl-2-benzothiazole sulfenamide and zinc dimethyl dithiocarbamate in a mass ratio of 4:1, and the surfactant is one of sodium dodecylbenzenesulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, and sodium lauryl sulfate.

3. The anti-aging nitrile glove according to claim 1, characterized in that, The preparation method of the modified sericite includes the following steps: (1) Add sericite to deionized water and disperse it by ultrasonication. Add chitosan to 2 vol% acetic acid solution and stir to dissolve. Then slowly add the chitosan solution to the sericite dispersion, sonicate for 3-5 hours, centrifuge, wash and dry to obtain chitosan-intercalated sericite. (2) Prepare 0.1 mol / L silver nitrate solution and 0.1 mol / L sodium citrate solution with deionized water respectively. Add chitosan-intercalated sericite to deionized water and disperse by ultrasonication. Add silver nitrate solution to chitosan-intercalated sericite dispersion. Stir at 70~80℃ for 2~4 h. Then add sodium citrate solution and continue stirring for 18~24 h. After filtration, washing and drying, the modified sericite is obtained.

4. The anti-aging nitrile glove according to claim 3, characterized in that, The mass ratio of sericite to chitosan is 1:0.5~0.8, and the mass ratio of chitosan-intercalated sericite, silver nitrate and sodium citrate is 1:0.2~0.4:0.2~0.

4.

5. The anti-aging nitrile glove according to claim 1, characterized in that, The preparation method of the modified nano zinc oxide includes the following steps: A. Add 4-aminodiphenylamine to toluene and heat to 60°C with stirring to completely dissolve the aminodiphenylamine. Under a nitrogen atmosphere, slowly add dibutyltin dilaurate and propyltriethoxysilane 3-isocyanate. Heat to 80°C and keep the temperature for 4-6 hours. After the reaction is completed, cool to room temperature and remove toluene by vacuum distillation to obtain the anti-aging coupling agent. B. Add nano zinc oxide to an ethanol / water mixture and ultrasonically disperse for 5-10 minutes. Then slowly add an anti-aging coupling agent and continue ultrasonic dispersion for 5-10 minutes. Heat to 80°C and keep the temperature for 3-5 hours. After cooling, filter, wash, and dry to obtain modified nano zinc oxide.

6. The anti-aging nitrile glove according to claim 5, characterized in that, The molar ratio of 4-aminodiphenylamine and 3-isocyanate propyltriethoxysilane is 1:1 to 1.2, and the amount of dibutyltin dilaurate is 0.2 to 0.3% of the total mass of 4-aminodiphenylamine and 3-isocyanate propyltriethoxysilane.

7. The anti-aging nitrile glove according to claim 5, characterized in that, The mass ratio of the nano zinc oxide to the anti-aging coupling agent is 3~5:

1.

8. The method for preparing the anti-aging nitrile gloves according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Mix nitrile latex, modified sericite, modified nano zinc oxide, vulcanizing agent, accelerator, surfactant, and deionized water, and stir at a rate of 200~300 r / min for 20~24 h to obtain a slurry; S2. Clean and dry the glove mold, immerse it in the release agent solution and then drip dry it, then immerse it in the slurry and drip dry it. Repeat this process 1-2 times. After hemming, vulcanizing, cleaning, drying, and demolding, the anti-aging nitrile gloves are obtained.

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