Preparation method of multifunctional butyronitrile protective gloves

Abstract

The invention provides a preparation method of multifunctional butyronitrile protective gloves, which belongs to the technical field of protective articles and comprises the following steps: respectively preparing inner latex containing a composite antibacterial agent, middle latex containing nano iron-manganese dioxide core-shell particles and outer latex containing a mesoporous composite carrier, an oil-proof agent and antibacterial peptide; and a temperature-sensitive color-changing coating liquid containing a temperature-sensitive color-changing microcapsule. Immersing the pretreated hand mold into a coagulator, drying, then sequentially immersing into inner-layer latex for applying an electrostatic field to enable an antibacterial agent to be directionally enriched, middle-layer latex for preventing nano iron powder from being oxidized through nitrogen protection and outer-layer latex, and drying after each layer of latex is immersed, so as to form a three-layer functional adhesive film. And spraying a temperature-sensitive color-changing coating liquid on the surface of the outermost layer of the adhesive film, and drying to finally complete the preparation of the protective gloves. The preparation method of the multifunctional butyronitrile protective gloves is excellent in protective effect, firm and stable in adhesive film adhesion, long in service life and good in product quality.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of protective products, more specifically, it relates to a preparation method of multifunctional nitrile protective gloves. BACKGROUND

[0002] Nitrile protective gloves have been widely used in medical, chemical, food processing and other fields due to their advantages such as oil resistance, chemical corrosion resistance and no natural rubber protein allergy risk. However, with the complexity of application scenarios, traditional nitrile gloves gradually expose many defects: prone to brittle cracking in low temperature environment, unable to meet the operation requirements of cold chain logistics, low temperature laboratory and other scenes; difficult to discharge hand sweat for a long time, easy to breed bacteria and cause itching; lack of damage warning and pollutant indication function, users are difficult to detect in time when the protection fails; prone to aging in ozone environment, short service life, and difficult to balance oil resistance and antibacterial performance.

[0003] In the prior art, there are improvements for single performance of nitrile gloves, such as some schemes improve low temperature resistance by adjusting latex formula, or achieve basic antibacterial function by adding antibacterial agent, but none of them achieve multifunctional integration. Another scheme attempts to use a multi-layer structure design, but the interlayer bonding force is poor and easy to peel off, and the production process lacks control of the stability of functional additives, resulting in poor product performance and short service life. In addition, the existing preparation method is easy to cause uneven film thickness and functional failure, which is difficult to meet the stability and efficiency requirements of industrial production. SUMMARY

[0004] The purpose of the present application is to provide a preparation method of multifunctional nitrile protective gloves, aiming to solve the problems of unstable glove structure, poor stability and short service life.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is to provide a preparation method of multifunctional nitrile protective gloves, comprising: The ceramic hand mold is pretreated, then sprayed with silane coupling agent and cured; the inner layer latex containing composite antibacterial agent, the middle layer latex containing nano iron-manganese dioxide core-shell particles, the outer layer latex containing mesoporous composite carrier, oil-proof agent and antibacterial peptide, and the temperature-sensitive color-changing coating liquid containing temperature-sensitive color-changing microcapsules are prepared respectively; The pretreated hand mold is immersed in a coagulant, and after drying, it is immersed in the inner layer latex for directional enrichment of the antibacterial agent, the middle layer latex for preventing oxidation of nano iron powder by nitrogen protection, and the outer layer latex, and after each layer of latex is immersed, drying treatment is carried out, forming a three-layer functional film; The temperature-sensitive color-changing coating liquid is sprayed on the surface of the outermost layer of film and dried, and the preparation of protective gloves is finally completed after chlorination treatment, water washing, high temperature vulcanization, mechanical edge folding and automatic demolding.

[0006] In a possible implementation, the pre-treatment of the ceramic hand mold, followed by spraying of the silane coupling agent and curing treatment, comprises: During the hand mold treatment process, a dilute sulfuric acid solution is used to remove the surface oxide layer and stubborn stains of the hand mold, and a sodium hydroxide solution is used to remove the oil on the surface of the hand mold. After spraying the silane coupling agent, it is cured at 120°C for 30 minutes to improve the adhesion of the hand mold and the latex.

[0007] In a possible implementation, the preparation of the inner layer latex containing the composite antibacterial agent and the middle layer latex containing the nano-iron-manganese dioxide core-shell particles comprises: Using specific direction continuous stirring combined with ultrasonic dispersion technology ensures uniform dispersion and no agglomeration of the composite antibacterial agent; During the preparation of the middle layer latex, the whole process is carried out in a nitrogen protective atmosphere to avoid the oxidation of nano-iron powder in the nano-iron-manganese dioxide core-shell particles.

[0008] In a possible implementation, the outer layer latex containing the mesoporous composite carrier and the oil-proof agent and the antibacterial peptide comprises: Mixing the mesoporous composite carrier with the oil-proof agent and the antibacterial peptide and ultrasonic dispersion treatment makes the oil-proof agent and the antibacterial peptide fully adsorbed in the pore structure of the mesoporous composite carrier, and then mixing and stirring with other components ensures the long-term effectiveness of the oil-resistant and antibacterial functions of the outer layer latex film.

[0009] In a possible implementation, the immersion of the pre-treated hand mold into the coagulant comprises: First, the hand mold is preheated and then immersed in the coagulant containing calcium chloride, and after immersion, it is dried to form a uniform coagulation layer; During the immersion of each subsequent layer of latex, the immersion temperature and time are controlled according to the characteristics of the latex to ensure uniform thickness and meet the design requirements.

[0010] In a possible implementation, the inner layer latex after drying is immersed in a static electric field to make the antibacterial agent directional enrichment comprises: The application of a static electric field makes the inner metal layer of the hand mold and the latex container form a loop, so that the positively charged composite antibacterial agent moves to the surface of the hand mold, realizing the enrichment of the antibacterial agent inside the inner layer latex film.

[0011] In a possible implementation, the middle layer latex and the outer layer latex prevented from oxidation of nano-iron powder by nitrogen protection comprises: After the immersion of the middle layer latex, drying is carried out under nitrogen protection to ensure drying efficiency while avoiding oxidation of nano-iron powder; The outer layer latex dip solution is dried at a preset temperature to promote the cross-linking of the rubber film and to enhance the bonding force between the mesoporous composite carrier and the latex base material.

[0012] In a possible implementation, the spraying of the temperature-sensitive color-changing coating liquid on the surface of the outermost rubber film and drying include: The spraying rate and the hand mold rotation speed are controlled when the temperature-sensitive color-changing coating liquid is sprayed to ensure that the coating layer uniformly covers the surface of the outer rubber film; and low-temperature drying is performed after spraying to avoid damage to the temperature-sensitive color-changing microcapsules due to high temperature.

[0013] In a possible implementation, the chlorination treatment, water washing, high-temperature vulcanization, mechanical crimping, and automatic demolding finally complete the preparation of the protective gloves include: A low-concentration chlorine solution is used to control the treatment temperature and time, and the smoothness and wear comfort of the glove surface are improved; after chlorination treatment, the gloves are sequentially washed with warm water and deionized water to remove residual chlorine and impurities while avoiding negative effects on the subsequent vulcanization process and glove performance.

[0014] In a possible implementation, the chlorination treatment, water washing, high-temperature vulcanization, mechanical crimping, and automatic demolding finally complete the preparation of the protective gloves include: The high-temperature vulcanization adopts a segmented temperature rising mode, gradually increasing the temperature and keeping it warm; the crimping width is controlled during mechanical crimping to facilitate glove wearing and removal, and to improve the sealing performance of the glove wrist part.

[0015] The multifunctional nitrile protective glove preparation method provided by the application has the following advantages compared with the prior art: first, the ceramic hand mold is pretreated, then the silane coupling agent is sprayed and solidified, then the inner layer latex containing a composite antibacterial agent, the middle layer latex containing nano iron-manganese dioxide core-shell particles, the outer layer latex containing a mesoporous composite carrier and an oil-proof agent and an antibacterial peptide, and the temperature-sensitive color-changing coating liquid containing temperature-sensitive color-changing microcapsules are prepared.

[0016] After the above steps are completed, the pretreated hand mold is immersed in a coagulant, and after drying, it is sequentially immersed in the inner layer latex for directional enrichment of the antibacterial agent, the middle layer latex protected by nitrogen to prevent oxidation of the nano iron powder, and the outer layer latex, and drying treatment is performed after each layer of latex is immersed, finally forming a three-layer functional rubber film. Then the temperature-sensitive color-changing coating liquid is sprayed on the surface of the outermost rubber film and dried, and the chlorination treatment, water washing, high-temperature vulcanization, mechanical crimping, and automatic demolding finally complete the preparation of the protective gloves. The protective gloves prepared by the method provided in the application have excellent protection effect, the rubber film is firmly attached, the service life is long, and the product quality is good. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings.

[0018] Figure 1 The flow chart of the preparation method of the multifunctional nitrile protective glove provided by the embodiments of the present application. DETAILED DESCRIPTION

[0019] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly, the following will further describe the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0020] Please refer to Figure 1 The preparation method of the multifunctional nitrile protective glove provided by the present application will be described. The preparation method of the multifunctional nitrile protective glove comprises: The ceramic hand mold is pretreated, then silane coupling agent is sprayed and solidified treatment is performed; the inner layer latex containing composite antibacterial agent, the middle layer latex containing nano iron-manganese dioxide core-shell particles, the outer layer latex containing mesoporous composite carrier and oil-proof agent and antibacterial peptide, and the temperature-sensitive color-changing coating liquid containing temperature-sensitive color-changing microcapsules are prepared respectively; The pretreated hand mold is immersed in a coagulant, and then the inner layer latex for directional enrichment of antibacterial agent, the middle layer latex for preventing oxidation of nano iron powder by nitrogen protection and the outer layer latex are sequentially immersed after drying, and drying treatment is performed after each layer of latex is immersed, to form three layers of functional glue film; The temperature-sensitive color-changing coating liquid is sprayed on the surface of the outermost layer of glue film and dried, and the preparation of the protective glove is finally completed through chlorination treatment, water washing, high temperature vulcanization, mechanical crimping and automatic demolding.

[0021] The preparation method of the multifunctional nitrile protective glove provided by the present application has the beneficial effects that, compared with the prior art, the preparation method of the multifunctional nitrile protective glove of the present application first pretreats the ceramic hand mold, then sprays silane coupling agent and performs solidification treatment, and then prepares the inner layer latex containing composite antibacterial agent, the middle layer latex containing nano iron-manganese dioxide core-shell particles, the outer layer latex containing mesoporous composite carrier and oil-proof agent and antibacterial peptide, and the temperature-sensitive color-changing coating liquid containing temperature-sensitive color-changing microcapsules.

[0022] After completing the above steps, the pretreated hand mold is immersed in a coagulant, dried, and then sequentially immersed in an inner latex layer where an antibacterial agent is directionally enriched under an electrostatic field, a middle latex layer protected by nitrogen to prevent oxidation of nano-iron powder, and an outer latex layer. Each latex layer is dried after immersion, ultimately forming a three-layer functional film. A thermosensitive color-changing coating is then sprayed onto the outermost film surface and dried. Following chlorination, washing, high-temperature vulcanization, mechanical edge curling, and automatic demolding, the protective glove is finally complete. The protective gloves prepared by the method provided in this application exhibit excellent protective performance, with firmly adhered and stable film adhesion, a long service life, and high product quality.

[0023] Through the orderly combination of a four-layer structure—inner layer, middle layer, outer layer, and thermosensitive color-changing layer—complementary functions are achieved. The inner layer's composite antibacterial agent addresses the problem of bacterial growth on the hands, while the microfluidic structure (formed using grooves in the hand mold) facilitates sweat drainage. The middle layer's nano-iron-manganese dioxide core-shell particles provide both damage warning (iron powder oxidizes and turns red) and ozone resistance (manganese dioxide decomposes ozone). The outer layer's mesoporous composite carrier adsorbs oil-repellent agents and antimicrobial peptides, enhancing oil resistance and broad-spectrum antibacterial properties. The thermosensitive color-changing layer uses microcapsule color changes to reflect ambient temperature, forming a complete protective system of "active protection + intelligent early warning," breaking through the limitations of traditional gloves' single function.

[0024] The steps are not simply superimposed, but form a logical closed loop. For example, the silane coupling agent modification during hand mold pretreatment lays the foundation for tight adhesion of the subsequent adhesive film; the electrostatic field enrichment during inner layer impregnation ensures the antibacterial agent is directionally distributed on the hand contact side, improving antibacterial efficiency; nitrogen protection in the middle layer and high-temperature drying in the outer layer respectively ensure the activity of the nano-iron powder and the functional stability of the mesoporous carrier; the post-treatment process of chlorination-sulfurization-edge curling optimizes the mechanical properties of the glove and improves wearing convenience. This synergistic design throughout the entire process solves the key problems of interlayer delamination and functional agent failure in existing technologies.

[0025] The foundation of modified carboxylated nitrile butadiene latex: Through monomer emulsion polymerization, addition of functional additives and treatment with composite modifiers, the latex is made to have specific solid content, pH value and viscosity, which can not only meet the molding requirements of each layer of film, but also ensure the interlayer bonding force (avoiding delamination caused by the mismatch of latex properties), and provide a substrate guarantee for the realization of multifunctional structures.

[0026] In some embodiments of the method for preparing multifunctional nitrile protective gloves provided in this application, the pretreatment of the ceramic hand mold followed by spraying with a silane coupling agent and curing includes: During the hand mold processing, dilute sulfuric acid solution is used to remove the oxide layer and stubborn stains on the surface of the hand mold, and sodium hydroxide solution is used to remove grease from the surface of the hand mold.

[0027] After silane coupling agent spraying and curing at 120℃ for 30 minutes to improve the adhesion of the hand mold and the latex.

[0028] Acid washing (dilute sulfuric acid solution) can remove the oxidation layer and stubborn stains on the surface of the hand mold. If the oxidation layer remains, it will cause uneven adhesion of the latex and cause film defects. Alkaline washing (sodium hydroxide solution) can remove grease. Grease will reduce the affinity of the latex and the hand mold, causing the film to break when demolding. Hot water cleaning at 80-82℃ can thoroughly rinse the remaining acid and alkali, avoid damage to the pH value and polymer structure of the latex, and ensure stable film performance.

[0029] The process parameters of 120℃ curing for 30 minutes are the optimal conditions verified by a large number of experiments. If the temperature is too low or the time is insufficient, the coupling agent cannot fully react with the hydroxyl groups on the surface of the hand mold, and the adhesion improvement is limited. If the temperature is too high or the time is too long, the coupling agent is easily carbonized, which affects the adhesion of the film. After modification, the adhesion of the hand mold and the latex is improved by more than 30%, effectively solving the problem of uneven film thickness and demolding damage caused by insufficient adhesion of traditional hand molds.

[0030] The modified carboxyl nitrile latex is made by monomer emulsion polymerization, functional additive addition, and composite modifier treatment. The surface of the hand mold is provided with a strip-shaped groove matched with the micro-channel of the inner surface of the glove.

[0031] In some embodiments of the method for preparing multifunctional nitrile protective gloves provided in the application, the inner layer latex containing a composite antibacterial agent and the middle layer latex containing nano iron-manganese dioxide core-shell particles are prepared respectively, including: Specific direction continuous stirring combined with ultrasonic dispersion technology is used to ensure uniform dispersion and no agglomeration of the composite antibacterial agent.

[0032] The preparation of the middle layer latex is carried out in a nitrogen protective atmosphere to avoid oxidation of the nano iron powder in the nano iron-manganese dioxide core-shell particles.

[0033] The combination process of "specific direction stirring + colloid mill grinding + ultrasonic dispersion" is designed for the characteristics of the composite antibacterial agent, which is prone to agglomeration. Specific direction stirring (such as clockwise) can avoid latex stratification, colloid mill grinding can reduce particle size, and 500W ultrasonic dispersion can break the agglomerates of the antibacterial agent using cavitation effect, ensuring uniform distribution of the antibacterial agent in the latex, avoiding mechanical performance decline of the film caused by too high local antibacterial concentration, or antibacterial failure caused by too low concentration.

[0034] The nano iron powder in the nano iron-manganese dioxide core-shell particle has very high activity, and if it is exposed to air during preparation, it will be oxidized and turned red in advance, resulting in failure of the subsequent damage warning function. Therefore, an inert atmosphere is formed by nitrogen protection throughout the process to isolate oxygen from the iron powder, ensuring that the iron powder reacts with air only when the glove is damaged, ensuring the reliability of the warning function and solving the technical pain point of easy pre-oxidation of nano iron powder in the prior art.

[0035] In some embodiments of the preparation method of the multifunctional nitrile protective glove provided in the application, the outer layer latex containing the mesoporous composite carrier and the oil repellent agent and the antibacterial peptide comprises: The mesoporous composite carrier, the oil repellent agent and the antibacterial peptide are mixed and subjected to ultrasonic dispersion treatment, so that the oil repellent agent and the antibacterial peptide are fully adsorbed in the pore structure of the mesoporous composite carrier, and then mixed and stirred with other components to ensure the long-term effectiveness of the oil resistance and antibacterial functions of the outer layer film.

[0036] The mesoporous composite carrier (such as mesoporous silica-montmorillonite) has rich pore structure and high specific surface area, and the oil repellent agent and the antibacterial peptide are first adsorbed in the pores of the carrier by ultrasonic dispersion, which can avoid the functional failure caused by the direct reaction of the auxiliary agent with the latex polymer molecules; at the same time, the dispersibility of the carrier can drive the uniform distribution of the auxiliary agent in the film, avoiding the uneven oil resistance / antibacterial caused by local enrichment of the auxiliary agent.

[0037] The sequence design of "adsorption first and mixing later" is a key innovation that distinguishes from the traditional direct addition of auxiliary agents - if the latex and the carrier are mixed first and then the auxiliary agent is added, the auxiliary agent is difficult to fully enter the pores of the carrier, and is prone to loss caused by surface adsorption; while the adsorption of the auxiliary agent-carrier is completed first, and then mixed with the latex, the auxiliary agent can be stably loaded in the carrier, slowly released during the use of the glove, prolonging the effective period of the oil resistance and antibacterial functions, and solving the problem of easy loss and short effect of functional auxiliary agents in the prior art.

[0038] In some embodiments of the preparation method of the multifunctional nitrile protective glove provided in the application, immersing the pretreated hand mold into the coagulant comprises: The hand mold is first preheated and then immersed in a coagulant containing calcium chloride, and the immersion liquid is dried to form a uniform coagulation layer.

[0039] During the immersion of the subsequent layers of latex, the immersion temperature and time are controlled according to the characteristics of the latex to ensure that the film thickness is uniform and meets the design requirements.

[0040] Preheating the hand mold (e.g., 48-50°C) can make the coagulant (calcium chloride solution) quickly form a uniform coagulation layer on the surface of the hand. If the temperature of the hand mold is too low, the coagulant has poor flowability on the surface of the hand, and it is easy to have uneven coagulation layer thickness. If the temperature is too high, the coagulant is easy to evaporate quickly, and it cannot form a continuous coagulation layer. The presence of the coagulation layer can promote the subsequent latex to quickly coagulate on the surface of the hand, avoid the thickness deviation of the rubber film caused by the flow of the latex, and lay the foundation for the uniform formation of each layer of the rubber film.

[0041] The properties (e.g., viscosity, flowability) of different latexes are different, so the immersion liquid temperature and time need to be controlled accordingly. For example, the inner layer latex has low viscosity, and the immersion time needs to be appropriately shortened to avoid the rubber film being too thick. The outer layer latex has high viscosity due to containing mesoporous carriers, and the immersion time needs to be appropriately extended to ensure that the thickness of the rubber film meets the standard. This parameter differentiation design ensures that the thickness of each layer of the rubber film meets the design requirements, and avoids the performance of the functional layer not meeting the standard due to uniform parameters.

[0042] In some embodiments of the method for preparing the multifunctional nitrile protective glove provided in the present application, the inner layer latex, which is sequentially immersed after drying and subjected to an electrostatic field to allow the antibacterial agent to be directionally enriched, comprises: The electrostatic field is applied to form a loop between the inner metal layer of the hand mold and the latex container, so that the positively charged composite antibacterial agent moves to the surface of the hand mold, realizing the enrichment of the antibacterial agent on the inside of the inner layer rubber film.

[0043] The composite antibacterial agent (e.g., modified polylysine-chitosan) is positively charged in the latex, and a stable electrostatic field is formed by the loop formed between the inner metal layer (negative electrode) of the hand mold and the latex container (positive electrode). Under the action of the electric field force, the positively charged antibacterial agent moves to the surface of the hand mold (negative electrode), and finally enriches on the inside of the inner layer rubber film (the side in contact with the hand). This directional distribution makes the concentration of the antibacterial agent on the contact side 2-3 times higher than that on the non-contact side, which not only improves the antibacterial effect of the contact part of the hand, but also avoids the waste of the antibacterial agent on the non-contact side, solving the problem of low efficiency caused by the uniform distribution of the antibacterial agent in the traditional process.

[0044] A stable voltage (e.g., 100±2V) is applied through a direct current power supply to ensure that the enrichment degree of the antibacterial agent is consistent. If the voltage is too low, the enrichment effect is not obvious. If the voltage is too high, the latex is easy to be electrolyzed, which damages the structure of the rubber film. This parameter design has been verified through a large number of experiments, which can ensure the antibacterial effect while avoiding negative effects on the performance of the latex.

[0045] In some embodiments of the method for preparing the multifunctional nitrile protective glove provided in the present application, the middle layer latex and the outer layer latex, which are prevented from being oxidized by the nano iron powder through nitrogen protection, comprise: The middle layer latex is dried under nitrogen protection after immersion, which ensures the drying efficiency and avoids the oxidation of the nano iron powder.

[0046] The outer layer latex is immersed and then dried at a preset temperature to promote cross-linking of the rubber film and to enhance the bonding force between the mesoporous composite carrier and the latex base material.

[0047] The nitrogen flow is controlled within a specific range (e.g., 5-8 L / min) to ensure a stable inert atmosphere around the hand mold during the drying process, preventing oxidation of the nano-iron powder, while avoiding excessive flow that would cause the latex surface to dry too quickly and crack. Meanwhile, a drying temperature of 89-91°C ensures efficient drying while preventing high temperatures from damaging the structure of the core-shell particles, ensuring the proper functioning of the early warning and ozone resistance of the middle rubber film.

[0048] The outer rubber film is dried at a higher temperature of 111-113°C, which promotes the cross-linking of latex polymer molecules, enhancing the mechanical strength and chemical corrosion resistance of the outer rubber film. Additionally, high temperatures enhance the bonding force between the mesoporous composite carrier and the latex base material, preventing the carrier from falling off during use and ensuring the long-term effectiveness of the oil resistance and antibacterial functions. This temperature differentiation design reflects the precise matching of the functional requirements and process parameters of each layer of rubber film.

[0049] In some embodiments of the method for preparing the multifunctional nitrile protective glove provided in the present application, the surface of the outermost rubber film is sprayed with a temperature-sensitive color-changing coating liquid and then dried, including: The spraying rate and hand mold rotation speed are controlled during the spraying of the temperature-sensitive color-changing coating liquid to ensure uniform coverage of the coating layer on the surface of the outer rubber film. Low-temperature drying is performed after spraying to prevent the temperature-sensitive color-changing microcapsules from being damaged by high temperatures, affecting their color-changing function.

[0050] The matching of the spraying rate (1.0-1.2 ml / min) and the hand mold rotation speed (2 revolutions / min) ensures uniform coverage of the coating liquid on the surface of the outer rubber film, preventing incomplete coating or excessively thick coating, which would result in incomplete temperature indication or affect the flexibility of the glove. Meanwhile, low-temperature drying at 80°C prevents high temperatures from causing the temperature-sensitive color-changing microcapsules to rupture, ensuring that the microcapsules normally exhibit gradient color change within the range of -35°C to 50°C, solving the problem of microcapsule failure caused by traditional high-temperature drying.

[0051] The uniform coverage of the temperature-sensitive color-changing layer allows any part of the glove to feedback the environmental temperature, enabling users to intuitively judge temperature risks (e.g., blue indicating low temperature and red indicating high temperature) through color, achieving "active early warning" and breaking through the limitations of traditional gloves that cannot feedback environmental risks.

[0052] In some embodiments of the method for preparing the multifunctional nitrile protective glove provided in the present application, the preparation of the protective glove is finally completed through chlorination treatment, washing, high-temperature vulcanization, mechanical crimping, and automatic demolding, including: Low concentration of chlorine solution is used to control the processing temperature and time, improve the surface smoothness and wearing comfort of gloves; after chlorination treatment, the gloves are washed with warm water and deionized water in sequence to remove residual chlorine and impurities and avoid negative effects on subsequent vulcanization process and glove performance.

[0053] Low concentration of chlorine solution (0.1-0.2%) is used to treat the gloves at 25-30°C for 5-8 minutes, which can improve the surface smoothness of the gloves, reduce the wearing resistance, and avoid the aging and brittleness of the rubber film caused by high concentration of chlorine. During the chlorination process, chlorine molecules react with double bonds on the surface of the latex to form polar groups, which improve the surface wettability and smoothness, and solve the problem of difficult wearing of traditional nitrile gloves.

[0054] Washing with warm water (40-50°C) can promote the dissolution of residual chlorine, and washing with deionized water can completely remove residual impurities (such as unreacted chlorine and latex additives), thereby avoiding the stimulation of residual chlorine to the skin of the hands or affecting the subsequent vulcanization process. Experimental verification shows that the water washing process can remove ≥98% of residual chlorine, ensuring the safety of the gloves, and providing a clean rubber film surface for high-temperature vulcanization, thereby ensuring the vulcanization effect.

[0055] In some embodiments of the multifunctional nitrile protective glove preparation method provided in the present application, the preparation of the protective gloves is finally completed through chlorination treatment, water washing, high-temperature vulcanization, mechanical crimping and automatic demolding, comprising the following steps: The high-temperature vulcanization adopts a segmented heating mode, gradually increases the temperature and keeps it constant; and the mechanical crimping controls the crimping width to facilitate the wearing and removal of the gloves, and improve the sealing performance of the wrist part of the gloves.

[0056] The segmented heating mode of “50°C→80°C→132°C” is adopted to gradually increase the temperature and keep it constant, which can avoid the rapid evaporation of water in the rubber film caused by direct high-temperature vulcanization, and the occurrence of bubbles or cracks. The water on the surface of the rubber film is removed at the low-temperature stage (50°C), the latex is preliminarily crosslinked at the medium-temperature stage (80°C), and complete crosslinking is achieved at the high-temperature stage (132°C), thereby increasing the tensile strength of the gloves by more than 20% and keeping the elongation at break at more than 300%, and solving the problem of rubber film defects caused by traditional one-time vulcanization.

[0057] Practical design of mechanical crimping: control the crimping width (5-6mm), which increases the thickness and strength of the wrist part of the gloves to avoid tearing during wearing, and forms a certain sealing structure to prevent pollutants from entering the inside of the gloves from the wrist part. At the same time, the crimping design facilitates the rapid wearing and removal of the gloves, improves the convenience of use, and solves the problem of easy deformation of the wrist part of the traditional gloves and the inconvenience of wearing.

[0058] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for manufacturing multi-functional nitrile protective gloves, characterized in that, The application relates to a method for preparing a protective glove. The method comprises the following steps: Pre-treating a ceramic hand mold, then spraying a silane coupling agent and curing treatment; Preparation of an inner layer latex containing a composite antibacterial agent, a middle layer latex containing nano-iron-manganese dioxide core-shell particles, an outer layer latex containing a mesoporous composite carrier and an oil-proof agent and an antibacterial peptide, and a temperature-sensitive color-changing coating liquid containing temperature-sensitive color-changing microcapsules; After the pre-treatment, the hand mold is immersed in a coagulant, and after drying, the hand mold is sequentially immersed in an inner layer latex for directional enrichment of the antibacterial agent, a middle layer latex for preventing oxidation of nano-iron powder by nitrogen protection, and an outer layer latex, and after each layer of latex is immersed, drying treatment is performed, so as to form a three-layer functional glue film; 2. The method of making multi-functional nitrile examination glove of claim 1, wherein, The temperature-sensitive color-changing coating liquid is sprayed on the surface of the outermost layer of glue film and dried, and after chlorination treatment, water washing, high-temperature vulcanization, mechanical edge rolling and automatic demolding, the preparation of the protective glove is finally completed. The pre-treatment of the ceramic hand mold and the spraying and curing treatment of the silane coupling agent comprise the following steps: During the treatment of the hand mold, a dilute sulfuric acid solution is used to remove the oxidation layer and stubborn stains on the surface of the hand mold, and a sodium hydroxide solution is used to remove oil on the surface of the hand mold; 3. The method of making multi-functional nitrile examination glove of claim 1, wherein, After the spraying of the silane coupling agent, curing treatment is performed at 120 DEG C for 30 minutes to improve the adhesion between the hand mold and the latex. The preparation of the inner layer latex containing a composite antibacterial agent and the middle layer latex containing nano-iron-manganese dioxide core-shell particles comprises the following steps: Specific direction continuous stirring is combined with grinding and ultrasonic dispersion technology to ensure that the composite antibacterial agent is uniformly dispersed and not aggregated; 4. The method of making multi-functional nitrile examination glove of claim 1, wherein, During the preparation of the middle layer latex, the whole process is performed in a nitrogen protection atmosphere to avoid the oxidation of nano-iron powder in the nano-iron-manganese dioxide core-shell particles in advance. The outer layer latex containing a mesoporous composite carrier and an oil-proof agent and an antibacterial peptide comprises the following steps:

5. The method of making multi-functional nitrile examination glove of claim 1, wherein, The mesoporous composite carrier, the oil-proof agent and the antibacterial peptide are mixed and subjected to ultrasonic dispersion treatment, so that the oil-proof agent and the antibacterial peptide are fully adsorbed in the pore structure of the mesoporous composite carrier, and then other components are mixed and stirred, so as to ensure the long-term effectiveness of the oil resistance and antibacterial function of the outer layer glue film. The immersion of the pre-treated hand mold in the coagulant comprises the following steps: The hand mold is preheated and then immersed in the coagulant containing calcium chloride, and after immersion, drying is performed to form a uniform coagulation layer; 6. The method of making multi-functional nitrile examination glove of claim 1, wherein, During the immersion of each layer of latex, the immersion temperature and time are controlled according to the characteristics of the latex to ensure that the glue film thickness is uniform and meets the design requirements. The sequential immersion of the dried hand mold in the inner layer latex for directional enrichment of the antibacterial agent comprises the following steps:

7. The method of making multi-functional nitrile examination glove of claim 1, wherein, An electrostatic field is applied to form a loop between the inner metal layer of the hand mold and the latex container, so that the positively charged composite antibacterial agent moves to the surface of the hand mold, and the enrichment of the antibacterial agent in the inner side of the inner layer glue film is realized. The middle layer latex and the outer layer latex for preventing oxidation of nano-iron powder by nitrogen protection comprise the following steps: After the immersion of the middle layer latex, drying is performed under nitrogen protection to ensure drying efficiency while preventing oxidation of nano-iron powder; 8. The method of making multi-functional nitrile examination glove of claim 1, wherein, After the immersion of the outer layer latex, drying is performed at a preset temperature to promote the crosslinking and molding of the glue film and to enhance the bonding force between the mesoporous composite carrier and the latex base material. The spraying of the temperature-sensitive color-changing coating liquid on the surface of the outermost layer of glue film and the drying comprise the following steps: The temperature-sensitive color-changing coating liquid is sprayed while controlling the spraying rate and the hand mold rotation speed to ensure that the coating layer uniformly covers the surface of the outer rubber film; and low-temperature drying is performed after spraying to avoid damage to the temperature-sensitive color-changing microcapsules due to high temperature and affect the color-changing function.

9. The method of making multi-functional nitrile examination glove of claim 1, wherein, The preparation of the protective glove finally includes chlorination treatment, water washing, high-temperature vulcanization, mechanical crimping, and automatic demolding. Low-concentration chlorine solution is used to control the treatment temperature and time, and the smoothness and wear comfort of the glove surface are improved; after chlorination treatment, the gloves are washed with warm water and deionized water in sequence to remove residual chlorine and impurities while avoiding negative effects on the subsequent vulcanization process and glove performance.

10. The method of making multi-functional nitrile examination glove of claim 1, wherein, The preparation of the protective glove finally includes chlorination treatment, water washing, high-temperature vulcanization, mechanical crimping, and automatic demolding. High-temperature vulcanization adopts a segmented heating method, gradually increasing the temperature and keeping it warm; the crimping width is controlled during mechanical crimping to facilitate glove wearing and removal, and at the same time, the sealing performance of the glove wrist part is improved.

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