Hypoallergenic biomass gloves manufacturing method and hypoallergenic biomass gloves

Abstract

To provide a method for producing biomass gloves that significantly reduces the protein extract content and reduces the risk of causing allergic reactions. [Solution] The method for manufacturing biomass gloves of the present invention includes the steps of cleaning and heating a mold, immersing the mold in a coagulant solution, and performing a pre-vulcanization treatment. The pre-vulcanization treatment involves the use of alkaline protease, ultraviolet irradiation, and blending of a cellulose-derived polyol. The latex-coated mold is then dried and washed, vulcanized with specific vulcanizing agents and accelerators, washed with chlorine, and then immersed in polyurethane for a second time to form a hypoallergenic inner layer. The manufactured gloves have a multi-layer structure including first, second, and third layers. The first layer includes nitrile rubber, chloroprene rubber, isoprene rubber, and a polysaccharide biomass material. The second layer includes a natural rubber layer or other synthetic rubber and a polysaccharide biomass material. The third layer includes a polyurethane layer.

Description

[Technical Field]

[0001] The present invention relates to the field of disposable gloves, and in particular to a method for producing biomass gloves with a low protein extractable content, which reduces the risk of causing an allergic reaction in the user. [Background technology]

[0002] Disposable gloves are used in a wide range of fields, including medical, food, and chemical industries, to protect against harmful substances. Many gloves are made of rubber. However, natural rubber is associated with Type I allergic reactions caused by water-soluble proteins present in latex. Accelerators and other chemicals used in the vulcanization of natural rubber can also cause Type IV chemical allergies.

[0003] Nitrile rubber gloves (hereinafter referred to as NBR gloves) have been attracting attention due to their excellent oil resistance, chemical resistance, and puncture resistance, but they have inferior elasticity compared to natural rubber latex gloves. Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, there is a need for gloves that have the elasticity of natural rubber, a low protein extractable content, and reduced allergenicity, and a method for manufacturing the same. [Means for solving the problem]

[0005] To solve the above problems, the present invention provides a method for manufacturing biomass gloves and biomass gloves manufactured by the method. The biomass gloves have a significantly reduced protein extract content, reducing the risk of allergic reactions in users. The pre-vulcanization process involves the use of a specific protease, ultraviolet irradiation, and the incorporation of a specific polyol. This allows for the manufacture of biomass gloves with high safety and performance.

[0006] The present invention aims to provide a method for producing biomass gloves with significantly reduced protein extract content, reduced risk of allergic reactions, and excellent elasticity. The biomass glove production method combines novel processes and novel materials to improve the safety and performance of the gloves.

[0007] During the manufacturing process, the mold is washed in a washing tank and heated in an oven to remove moisture.The mold is then immersed in a coagulant solution in a coagulant bath and heated in an oven to adhere the coagulant to the mold.The coagulant is used to properly coagulate and adhere the subsequent latex.

[0008] The mold is then immersed in a pre-vulcanized latex solution. During the pre-vulcanization, alkaline protease is added at a concentration of 0.1% to 2.0%, the pH is adjusted to 9.5 to 10.5, and the mixture is stirred at room temperature for 12 to 48 hours. Furthermore, the latex solution is irradiated with a wavelength of 240 to 270 nm and an intensity of 1.0 to 15.0 mW / cm. 2 The latex is irradiated with ultraviolet light for 5 seconds to 120 minutes using a UV lamp. Polyol is also added to the latex solution so that it accounts for 10 to 30% of the total solids of the latex solution, and reacts with the acid groups in the latex to form a network structure.

[0009] After immersing the mold in the latex solution for a certain period of time, the latex-coated mold is heated in a pre-drying oven to remove moisture, washed with water in a pre-cleaning tank for 60 to 300 seconds, and dried in a drying oven. The latex-coated mold is then vulcanized at 100 to 120°C for 18 to 25 minutes. The latex mixture contains a vulcanizing agent and an accelerator. The vulcanizing agent and accelerator include inorganic oxides, sulfur, zinc dibutyldithiocarbamate, and zinc diethyldithiocarbamate. The concentration of the inorganic oxide is 0.6 to 2 phr. The concentration of sulfur is 0.6 to 2 phr. The concentration of zinc dibutyldithiocarbamate is 0.2 to 1 phr. The concentration of zinc diethyldithiocarbamate is 0.2 to 1 phr.

[0010] After vulcanization, the gloves are washed in a 100-1000 ppm chlorine washing tank for 60-300 seconds, followed by water washing to neutralize any residual chlorine. The gloves are then washed in a post-washing tank with water for 60-300 seconds. The gloves are then immersed in a secondary material immersion tank containing 1-10% polyurethane (PU) polymer to form an inner layer with a thickness of approximately 0.01 mm or more. The gloves are then dried and demolded to produce biomass gloves. [Effects of the Invention]

[0011] The present invention provides a method for producing nitrile rubber gloves that are stretchy, low cost, high quality, and hypoallergenic. The gloves of the present invention also solve the problems of conventional gloves, can be applied in a wide range of fields, and can achieve high safety and high performance. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a flowchart showing the manufacturing process of the biomass glove of the present invention. [Figure 2] 1 is a flowchart of a mold cleaning process of the present invention. [Figure 3] 1 is a flowchart of a heating process according to the present invention. [Figure 4] 1 is a flowchart of a coagulant immersion step of the present invention. [Figure 5] 1 is a flowchart of a heating process according to the present invention. [Figure 6] 1 is a flow chart for dipping a mold of the present invention into a latex solution. [Figure 7] 1 is a flowchart of the pre-vulcanization process of the present invention. [Figure 8] FIG. 1 is a structural schematic diagram of one embodiment of the biomass glove of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention relates to a method for manufacturing biomass gloves that significantly reduces the protein extract content and reduces the risk of allergic reactions. Conventional nitrile rubber gloves are used in a wide range of fields, including medicine, food processing, and chemistry, and have excellent oil resistance, chemical resistance, and puncture resistance. However, they have issues such as the risk of allergies due to residual proteins and chemicals remaining in the manufacturing process, and poor elasticity.

[0014] In the present invention, "protein extractable content" refers to the amount of protein extracted from a glove. Extractable protein refers to proteins leached out when a glove comes into contact with an aqueous solution, or proteins leached out of a glove in general circumstances. When such proteins come into contact with a user's skin, they can cause allergic reactions in individuals allergic to natural rubber latex proteins. The hypoallergenic nitrile rubber biomass gloves of the present invention minimize their protein extractable content through a special manufacturing process. The protein extractable content is reduced by a pre-vulcanization treatment (described in detail in a later paragraph) involving the use of alkaline protease and ultraviolet irradiation. This process decomposes and removes extractable proteins, thereby reducing the allergenicity of the gloves. The reduction in protein extractable content achieved by this treatment has met rigorous testing standards, such as ASTM D5712. As a result, the protein extractable content of the gloves of the present invention is significantly reduced, and the final gloves are also hypoallergenic. Reducing the protein extractable content directly affects the hypoallergenicity of the gloves. Therefore, reducing extractable proteins can ensure glove safety, particularly in medical and food environments.

[0015] The manufacturing method of the present invention improves the safety and performance of gloves by combining specific processes and materials. The pre-vulcanization process, which is a feature of the present invention, involves the use of alkaline protease, ultraviolet irradiation, and polyol. Furthermore, by integrating the benefits of synthetic and natural rubber through a multi-layer structure, the mechanical performance of the gloves can be improved and hypoallergenic properties can be achieved.

[0016] This method also reduces the risk of Type IV chemical allergies caused by accelerators and other chemicals used in the vulcanization process by forming an inner layer that comes into contact with the user's skin through a secondary polyurethane dipping process. The inner layer acts as a barrier, improving comfort and safety for users with sensitive skin.

[0017] The method of the present invention reduces allergenicity and improves the mechanical performance of gloves. The polyol reacts with the acid groups in the latex to form a network structure, improving the tensile strength and elongation of the product. Multiple dipping strengthens the gloves and allows them to withstand harsh applications.

[0018] FIG. 1 is a flowchart of the manufacturing process for the biomass glove of the present invention. In the manufacturing process, first, a mold is prepared and latex is pre-vulcanized. The mold preferably has a smooth, defect-free surface so that the latex can be uniformly attached to the mold during the manufacturing process. The mold preparation process includes a step of cleaning the mold (step S110) and a step of heating the mold to remove moisture (step S110). Before immersing the mold in the coagulant and latex solution, the mold is cleaned to remove contaminants that may affect the quality of the glove. In this embodiment, shown in FIG. 2, the mold cleaning process includes the following steps:

[0019] S111 (First water wash) First, wash the mold with water to remove particles and surface dust. S112 (Detergent Cleaning) The mold is then cleaned with a detergent solution to remove grease, oily stains, and other organic residues. This process removes contaminants present on the mold surface that may affect the adhesion of latex. S113 (Wash with a Brush) Use a brush to manually or mechanically wash the mold to remove all residue, especially in areas that are difficult to clean with water alone. S114 (Water Wash) After cleaning with a brush, rinse the mold with water to remove any remaining detergent and residue. S115 (Initial drying): Initial drying is performed by drying the cleaned mold naturally with air or in a forced ventilation environment.

[0020] After cleaning and drying the mold, the mold is heated to remove any remaining moisture (step S120). This step S120 prevents defects in the subsequent latex coating and ensures good adhesion of the latex to the mold. As shown in Figure 3, the heating step includes the following steps:

[0021] S121 (preheating) mold is placed in an oven to preheat to a specific temperature to evaporate all moisture. The preheating temperature and time can be adjusted to achieve the desired effect.

[0022] S122 (Continuous Heating) The temperature of continuous heating is set to 50℃~100℃ depending on the requirements of the manufacturing process. The mold is heated for a certain period of time to completely dry it.

[0023] S123 (Cooling) After heating, the mold is cooled slightly before the next process. Cooling stabilizes the mold temperature and ensures the uniformity of the latex coating layer in the subsequent process.

[0024] After the mold is prepared, a coagulant immersion step is performed. The coagulant immersion step involves forming and adhering a latex film to the cleaned and heated mold in a subsequent step. The coagulant immersion step includes immersing the mold in a coagulant solution (step S130) and heating the mold in a coagulant oven (step S140).

[0025] In step S130, the latex applied in the subsequent step is solidified on the mold to form a uniform latex film that will become the glove. As shown in Figure 4, the coagulant immersion step includes the following steps.

[0026] S131 (Preparation of Coagulant Solution) The coagulant solution contains calcium nitrate dissolved in water or alcohol solution. By controlling the concentration of calcium nitrate, the latex can be coagulated to form a uniform thin film. To improve wetting of the mold and uniformity of the applied layer, the coagulant solution may contain additives such as surfactants or wetting agents.

[0027] The S132 (immersion) mold is immersed in the coagulant solution. Those skilled in the art can control the immersion time to ensure a uniform application of the coagulant. Typically, the mold immersion time ranges from a few seconds to a few minutes, depending on the thickness of the coagulant layer and the process parameters.

[0028] S133 (Lifting) To form a uniform coating layer on the surface of the mold, the mold is slowly lifted from the coagulant solution at a constant speed. The lifting speed can be adjusted depending on the thickness of the coagulant layer, and a slower lifting speed can form a thicker coating layer.

[0029] S134 (Initial drying) After immersion, the mold is initially dried for a short period of time to dry the coagulant layer, and then proceed to the next step. Initial drying can be done by drying naturally in air or in a forced ventilation environment.

[0030] After step S130, the mold is heated in a coagulant oven to activate the coagulant and allow the latex to adhere to the surface in the subsequent step. As shown in Figure 5, the heating step includes the following steps:

[0031] S141 (Preheat): The former is placed in a coagulant oven and preheated to a specific temperature. The preheating process dries and activates the coagulant layer for the later latex dipping process.

[0032] S142 (Continuous Heating) The temperature in the coagulant oven is controlled to a specific temperature, typically between 50°C and 100°C, to dry and activate the coagulant. The heating time ranges from a few minutes to an hour, depending on the process requirements and the thickness of the coagulant layer. During the heating process, the temperature and time are monitored and adjusted to ensure uniform activation of the coagulant. This allows the latex to adhere well to the mold in the next process.

[0033] S143 (Cooling) After heating for a certain period of time, in some cases the mold is cooled slightly before the latex dipping process. Cooling stabilizes the coagulant layer and ensures the uniformity of the latex film in subsequent processes.

[0034] Then, steps such as latex immersion (step S160) and pre-drying (step S170) are performed. In this embodiment, steps S160 to S170 must be repeated twice to form the first layer 110 and the second layer 120 of the biomass glove 100 shown in FIG. 8. Step S160 forms a uniform latex layer on the former, improving the mechanical performance of the glove. This will be explained with reference to FIG. 6. The step of immersing the former in the latex solution includes the following steps.

[0035] S161 (Preparing a Latex Solution): In the first step S160, a latex solution is prepared by mixing nitrile rubber latex, a polysaccharide biomass material, and various additives to obtain desired properties. In another embodiment, the latex solution contains other synthetic rubbers (e.g., chloroprene rubber and isoprene rubber) and a polysaccharide biomass material. In the second step S160, a latex solution is prepared by mixing natural rubber latex and various additives to obtain desired properties. The additives may include stabilizers, surfactants, and other compounds to improve the stability and uniformity of the latex. Sufficient homogenization is performed to maintain the consistency of the composition of the latex solution.

[0036] S162 (Immersion): The coagulant-coated and heated mold is immersed in the latex solution. The immersion time is controlled to achieve a specific latex layer thickness. Generally, the mold immersion time is from a few seconds to a few minutes.

[0037] S163 (Lifting): The mold is lifted from the latex solution. The lifting speed of the mold must be controlled because it affects the thickness and uniformity of the latex layer.

[0038] Next, step S170 is performed. In one embodiment, step S170 involves heating the latex-coated mold in a pre-drying oven to remove moisture. In this process, the mold is placed in a pre-drying oven set at a temperature that evaporates moisture without decomposing the latex layer, such as 50°C to 80°C. The drying time is typically 5 to 30 minutes and is determined based on the thickness of the latex layer and the process requirements. After step S170 is completed, step S160 is performed again. The latex solution used in step S160 contains natural rubber latex as its main component. It should be noted that both the latex solution used in step S160 and step S160 have undergone a pre-vulcanization step (step S150). Because natural rubber contains a large amount of protein, the protein must be removed by step S150. This will be explained with reference to Figure 7. Step S150, the pre-vulcanization step, includes the following steps:

[0039] S151 (Addition of Alkaline Protease) The alkaline protease addition process is carried out before immersing the former in the latex solution. Alkaline protease is added to the latex solution at a weight percent concentration of 0.1% to 2.0%. The protease decomposes proteins in the latex, reducing the allergenicity of the gloves. To optimize the activity of the alkaline protease, the pH of the latex solution can be adjusted to, for example, 9.5 to 10.5. This pH range allows the protease to effectively decompose proteins during the pre-vulcanization process. The latex solution containing the added protease is stirred at room temperature for 12 to 48 hours. Stirring for such a long period allows the protease to fully interact with proteins, reducing the protein content in the final product.

[0040] S152 (ultraviolet irradiation) The latex coating mold is irradiated with ultraviolet light from an ultraviolet lamp with a wavelength of 240 to 270 nm. This specific wavelength can decompose proteins and other organic compounds in the latex. The intensity of the ultraviolet irradiation is 1.0 to 15.0 mW / cm. 2The irradiation time ranges from 5 seconds to 120 minutes and is determined depending on the degree of protein reduction and other process parameters. In another embodiment, the entire latex solution is irradiated with UV light before the mold is immersed in the latex solution.

[0041] S153 (Polyol Blending) The polyol blending process is performed before immersing the former in the latex solution. A polyol is blended into the latex solution at a concentration of 10-30% of the total solids in the latex solution. The polyol reacts with the acid groups in the latex to form a network structure that improves the mechanical performance of the glove. In one embodiment, the polyol chemically reacts with the carboxylic acid groups in the latex to form ester bonds, crosslinking the latex molecules. The crosslinked structure forms a network structure in the latex, improving tensile strength, elasticity, and resistance to dissolution by water-soluble proteins. In this embodiment, the polyol is derived from a cellulose material.

[0042] The process will be described with reference to FIG. 1. After the latex immersion, pre-vulcanization, and pre-drying steps are completed, pre-cleaning (step S180) is performed. In the pre-cleaning step, the mold is washed in a pre-cleaning tank to remove water-soluble proteins and other impurities. In step S180, the mold is immersed in a cleaning solution in the pre-cleaning tank. The cleaning solution is typically water, but other reagents, such as surfactants or neutral detergents, may be added to improve the impurity removal effect. The mold is washed in the pre-cleaning tank for 60 to 300 seconds. The specific cleaning time is determined based on the impurity content and the requirements of the manufacturing process. The cleaning solution is gently stirred to improve the removal efficiency of proteins and impurities and clean the surface of the latex-coated mold. In step S180, the temperature of the cleaning solution is preferably 20°C to 40°C to increase the solubility of proteins and other contaminants and facilitate their removal.

[0043] After completing pre-drying, pre-washing, and other processes, the glove is subjected to a vulcanization process (step S190). During the vulcanization process, the latex-coated mold is heated in the presence of a vulcanizing agent and an accelerator to form crosslinks between rubber molecules, thereby improving the elasticity, strength, and durability of the glove. In step S190, the latex-coated mold is placed in a vulcanization oven, which is controlled at a temperature that will not decompose the latex or other materials during the vulcanization process, such as 100°C to 120°C. In this embodiment, the temperature is typically 100°C to 120°C, and the heating time is 18 to 25 minutes. However, those skilled in the art can adjust the heating time depending on the thickness of the latex layer, the ingredients of the latex mixture, and other process parameters.

[0044] In the vulcanization process, specific vulcanizing agents and accelerators are added to the latex to promote crosslinking of rubber molecules. Vulcanizing agents and accelerators include the following compounds:

[0045] [Inorganic oxides] In this embodiment, the concentration of inorganic oxide is 0.6 to 2 phr. The inorganic oxide is used to promote crosslinking and improve the stability and mechanical properties of the rubber.

[0046] [sulfur] Sulfur is a vulcanizing agent. In this embodiment, the concentration of sulfur is 0.4 to 2 phr. Sulfur is used to form crosslinks between rubber molecules, thereby improving the elasticity and durability of the gloves.

[0047] [Zinc dibutyldithiocarbamate] Zinc dibutyldithiocarbamate is a secondary accelerator. In this example, the concentration of zinc dibutyldithiocarbamate is 0.2 to 1 phr. Zinc dibutyldithiocarbamate is used to accelerate the vulcanization process, shorten the time required for crosslinking, and improve the efficiency of the process.

[0048] [Zinc diethyldithiocarbamate] Zinc diethyldithiocarbamate is another secondary accelerator. In this example, the concentration of zinc diethyldithiocarbamate is 0.2 to 1 phr. Similar to zinc dibutyldithiocarbamate, zinc diethyldithiocarbamate is used to accelerate the vulcanization process and create crosslinks within the latex matrix.

[0049] Prior to the mold immersion step (step S160), vulcanizing agents and accelerators are mixed into the latex solution to disperse the compounds into the latex matrix and ensure a consistent degree of vulcanization in each part of the glove.

[0050] The following description will be given with reference to FIG. 1. The chlorine treatment (step S210) and washing (step S220) after vulcanization remove residual proteins, chemicals, and other contaminants, reducing the risk of allergic reactions and ensuring the cleanliness and safety of the final product. The chlorine washing step, step S210, removes proteins and other contaminants remaining on the surface of the gloves. Chlorine treatment denatures proteins, which are insoluble in latex and therefore easily removable, reducing the allergenicity of the gloves. In this example, chlorine is dissolved in water to prepare a 100-1000 ppm chlorine solution. This concentration of chlorine solution denatures proteins without damaging the latex material.

[0051] In step S210, the vulcanized gloves are immersed in a chlorine solution together with the former. The immersion time of the gloves is a time sufficient for the treatment, generally 60 to 300 seconds. During the immersion step, the chlorine solution is gently stirred to ensure that the surface of the gloves is evenly exposed to the chlorine.

[0052] After the gloves are immersed in the chlorine solution, step S220 is performed. In step S220, the gloves are rinsed with water to neutralize any residual chlorine and remove proteins and other contaminants that dissolve in the chlorine solution. In this step, the gloves are rinsed with water to remove the chlorine solution. Multiple water rinses may be performed to remove chlorine and other residues. Optionally, a neutralizing agent, such as sodium thiosulfate, may be added to the water to completely neutralize any residual chlorine.

[0053] Then, step S230 is performed. The post-cleaning bath removes residual soluble contaminants, ensuring the cleanliness of the final glove product and reducing the risk of allergic reactions. The post-cleaning bath contains water at room temperature or between 20°C and 40°C, improving the solubility of residual contaminants. During the cleaning process, the gloves are immersed in the cleaning solution for 60 to 300 seconds while the solution is gently agitated, enhancing the efficiency of contaminant removal and thoroughly cleaning the glove surface.

[0054] Then, step S240, a secondary dipping step, is performed. In this secondary dipping step, polyurethane is applied to the back surface of the biomass glove to form a smooth, non-irritating barrier layer, reducing the risk of Type IV chemical allergies and improving overall comfort. The polyurethane solution is prepared by dissolving or dispersing a polyurethane polymer material in an appropriate solvent or aqueous medium. To achieve the properties of the inner coating layer, the polyurethane solution is prepared so that the weight percent concentration of polyurethane in the polyurethane solution is 1% to 10%. This concentration ensures that the coating layer adheres uniformly and well to the latex surface.

[0055] In the second dipping process, the glove on the former is dipped into the polyurethane solution. The dipping time is controlled to form a thin polyurethane layer on the backside of the glove. Typically, the dipping time of the former is from a few seconds to a few minutes, but it is determined by the thickness of the coating layer. The former is slowly lifted out of the polyurethane solution at a constant speed. The lifting speed affects the thickness and uniformity of the polyurethane layer, and a slower lifting speed allows for the formation of a thicker coating layer.

[0056] In this embodiment, the thickness of the polyurethane inner layer is typically 0.01 to 0.04 mm, which provides a barrier layer against allergens and irritants without affecting the flexibility and feel of the glove.

[0057] This is followed by a drying step (step S250) and a demolding step (step S260). These steps allow the gloves to be completely dried and easily removed from the mold without affecting the integrity and quality of the gloves. In step S250, any solvent or moisture remaining in the secondary dipping step is removed. In this step, the gloves may be placed in a drying oven set at a temperature that will not damage the latex or polyurethane layer, such as 50°C to 70°C, while the remaining moisture or solvent evaporates, or they may be dried using forced ventilation. Depending on the glove properties and layer thickness, the drying time is usually 20 to 60 minutes. This drying time allows the gloves to be thoroughly dried and vulcanized at the same time.

[0058] To ensure uniform drying of all gloves, it is necessary to ensure air circulation within the drying oven. This prevents overheating or under-drying of the glove's genitals, ensuring the quality and performance of the gloves. During the drying process, temperature and time must be monitored to maintain quality, and any deviations must be corrected immediately.

[0059] In step S260, the dried gloves are carefully removed from the formers. If done manually, a craftsman carefully peels the gloves from the formers, requiring precision to avoid tearing or stretching the gloves. If done automatically, automated machinery can be used to remove the gloves from the formers, improving efficiency and consistency and reducing the risk of damage.

[0060] Optionally, a small amount of a release agent or lubricant may be used to facilitate the demolding process, thereby reducing glove sticking to the mold and reducing glove tearing. Mechanical equipment, such as air jets or robotic fingers, may be used to remove the gloves from the mold. This allows the gloves to be gently lifted at the edge, making them easier to peel. After the gloves are demolded, they are inspected for defects or damage. Inspection includes thickness uniformity, the presence of tears or holes, and overall quality. Defective gloves are detected and removed from the production line, and the remaining gloves are sorted and packaged.

[0061] Each batch of gloves is sampled and tested to ensure they meet specified standards such as tensile strength, elongation, and hypoallergenicity, ensuring the gloves meet performance requirements. The gloves are then packaged and shipped according to industry standards, and proper packaging maintains the quality and hygiene of the gloves until they reach the wearer.

[0062] Figure 8 is a structural schematic diagram of one embodiment of the biomass glove of the present invention. As shown in Figure 8, the biomass glove 100 has a multi-layer structure to improve mechanical performance, chemical resistance, and hypoallergenicity. The composition, function, and thickness of each layer of the biomass glove 100 are described in detail below.

[0063] In this embodiment, the multi-layer structure of the biomass glove 100 includes a first layer 110, a second layer 120, and a third layer 130. The first layer 110 is primarily composed of nitrile rubber and a polysaccharide biomass material. Nitrile rubber has excellent oil resistance, chemical resistance, and puncture resistance. The first layer 110 can also achieve specific performance by blending other synthetic rubbers, such as chloroprene rubber and isoprene rubber, in addition to the polysaccharide biomass material. The first layer 110 is the main component of the biomass glove 100 and provides the necessary strength, durability, and chemical resistance. The use of nitrile rubber or other synthetic rubbers allows the biomass glove 100 to withstand harsh environments and exposure to chemicals, making it suitable for industrial, medical, and other applications.

[0064] The second layer 120 is primarily made of natural rubber. Natural rubber has excellent elasticity, tensile strength, and comfort, improving the overall flexibility and fit of the biomass glove 100. The second layer 120 provides additional strength and elasticity to the glove, improving comfort and fit for the wearer. The use of a natural rubber layer improves the feel of the glove and makes it suitable for more precise manipulation.

[0065] In other embodiments, the second layer 120 is made of other synthetic rubbers and polysaccharide biomass materials. Synthetic rubbers, such as nitrile rubber or chloroprene rubber, have excellent oil, chemical, and puncture resistance, allowing gloves to be used in harsh industrial environments and chemical applications. Adding polysaccharide biomass materials (e.g., cellulose or starch) enhances the environmental friendliness of gloves, resulting in a more sustainable product. These biomass materials are biodegradable, reducing the carbon footprint of the product. Combining synthetic rubber and polysaccharide biomass materials improves the mechanical performance of gloves. Polysaccharides act as fillers or reinforcers to enhance the strength and durability of the synthetic rubber layer. This results in durable, lightweight, comfortable gloves suitable for extended wear. Furthermore, combining synthetic rubber and polysaccharide biomass materials reduces the protein extractable content, reducing the risk of allergic reactions. This makes the resulting gloves suitable for users who are allergic to natural rubber proteins, making them suitable for a wide range of applications, including medical, food, and laboratory use.

[0066] The second layer 120, made of a combination of natural or synthetic rubber and polysaccharide biomass material, provides the necessary strength, elasticity, and comfort while also meeting requirements such as chemical resistance, sustainability, and hypoallergenicity, improving glove performance. The biomass glove 100 with its various functions can be used in a wide range of applications, improving performance and user satisfaction.

[0067] In this embodiment, the third layer 130 is primarily made of polyurethane. Polyurethane is hypoallergenic and can form a smooth, non-irritating backing. The function of the third layer is to act as a hypoallergenic barrier layer, reducing the risk of Type IV chemical allergies. The third layer 130 provides a smooth backing for comfortable use by users with sensitive skin and allows the biomass glove 100 to be easily put on and taken off. The third layer 130 is formed in the secondary dipping process (step S240).

[0068] In this embodiment, the thickness of the first layer 110 is 0.01 mm to 0.2 mm. This range allows the biomass glove 100 to have sufficient strength and chemical resistance while maintaining flexibility. The thickness of the second layer 120 is 0.01 mm to 0.2 mm. The second layer 120 increases the overall thickness of the glove, improving elasticity and comfort. The thickness of the third layer 130 is 0.01 mm to 0.04 mm. This range allows the glove to maintain flexibility and comfort while providing a hypoallergenic barrier layer. The total thickness of the three-layer glove is 0.03 mm to 0.44 mm. The biomass glove 100 of this embodiment meets the requirements for strength, flexibility, and hypoallergenicity due to its multi-layer structure, making it suitable for a variety of applications.

[0069] The biomass gloves produced by the above process have excellent performance and can be used in a variety of harsh applications. Biomass gloves containing renewable and degradable materials (such as polysaccharide biomass materials) have a biomass content of 3% to 40%, making them environmentally friendly and sustainable, and meeting environmental awareness in the market.

[0070] The tensile strength of the glove is 14 to 40 MPa. This provides the glove with the mechanical strength required for severe applications. Gloves with this tensile strength can meet the high stress and high elongation requirements in industrial, medical, and laboratory applications. By improving the tensile strength, the durability of the glove is increased, reducing the frequency of glove replacement, which leads to cost benefits.

[0071] The biomass gloves have a breaking elongation of 350% to 800%, providing excellent flexibility and elasticity. This allows the biomass gloves to stretch without tearing, providing a comfortable fit to the user's hand. The high breaking elongation maintains flexibility and a pleasant feel, allowing the user to perform more precise operations.

[0072] One feature of biomass gloves is that they have a protein extractables concentration of less than 50 ppm. This low concentration can be achieved by using alkaline protease and pre-vulcanization treatment, including ultraviolet irradiation, to decompose and remove extractable proteins. Reducing the protein extractables content reduces the risk of allergic reactions to the gloves, making them suitable for use by people who are allergic to latex. Such hypoallergenic gloves can be used in fields such as medicine and food.

[0073] Glove palm thicknesses greater than 0.03 mm provide a good balance of protection and comfort. Gloves with this thickness provide protection against contaminants and hazardous materials while maintaining flexibility for fine motor movements. Gloves with this palm thickness also improve overall durability and can withstand wear in a variety of applications.

[0074] In summary, the biomass gloves produced by the above method have the following characteristics and performance: Its biomass content is between 3% and 40%, making it a renewable material. The tensile strength is 14 to 40 MPa, ensuring mechanical strength. It has excellent flexibility and elasticity with a breaking elongation of 350% to 800%. The protein extract concentration is less than 50 ppm, reducing the risk of causing allergic reactions. The palm thickness is over 0.03mm, providing a good balance between protection and comfort.

[0075] Biomass gloves with these properties can be used in a variety of applications and offer high performance, safety, and sustainability. The gloves, manufactured using novel material combinations and novel manufacturing methods, can meet the rigorous requirements of various industries while providing user comfort and environmental protection.

[0076] To verify that the biomass gloves of the present invention are hypoallergenic, environmentally sustainable, can be used by users with allergies, and have environmental protection effects, the applicant will request a third-party organization to test the protein extract content and biobased carbon content of the gloves.

[0077] The first test report, issued by SGS Taiwan Ltd. (Report No. HQ40011 / 2023), presents the analysis results for the water-soluble protein extractable content of the biomass gloves of the present invention. Analysis was performed using a method based on ASTM D5712-15, specifically the modified Lowry method, and the protein extractable content of the test sample was found to be 27.5 ppm. The low content of extractable water-soluble protein indicates that the biomass gloves of the present invention have a low risk of causing allergic reactions. The test was performed using a Shimadzu UV-1700 UV-VISIBLE spectrophotometer in an environment with an ambient temperature of 25±3°C and a relative humidity of 65±10%. The results indicate that the protein extractable content of the biomass gloves of the present invention is within an acceptable range and can be used by people who are allergic to latex.

[0078] The second test report, issued by Beta Analytic (Report Number: Beta-660692), is an analysis of the bio-based carbon content of biomass gloves. Testing was conducted according to ASTM D6866-22, Method B (AMS) TOC, and found that the gloves were 37% bio-based. This indicates that 37% of the glove's carbon content comes from renewable biomass, such as plants or animal by-products, and the remaining 63% comes from fossil sources such as petroleum. The measured pMC (percentage modern carbon) was 36.61 ± 0.12 pMC. An adjustment factor was used in this test to reflect current carbon dioxide levels. This high percentage of bio-based carbon indicates the gloves' environmental sustainability and meets the demand for environmentally friendly products. The analysis was conducted according to rigorous standards, resulting in ISO / IEC 17025:2017 testing certification PJLA #59423, demonstrating high accuracy and reliability.

[0079] As can be seen from the test reports, the biomass gloves of the present invention are hypoallergenic and contain many renewable materials. The SGS report shows that the gloves have a low protein extract content, reducing the possibility of causing allergic reactions. The Beta Analytic report shows that a significant portion of the gloves' composition is naturally derived, making them sustainable. The biomass gloves of the present invention are a good product for health- and environmentally conscious consumers, and can be used for a variety of purposes while ensuring safety, comfort, and environmental protection. [Explanation of symbols]

[0080] 100 Biomass Gloves 110 1st layer 120 2nd layer 130 3rd layer

Claims

1. A method for producing a biomass glove comprising the following steps (a) to (j): (a) Providing a glove-making mold having a coagulant applied to its surface. (b) The mold is immersed in a latex solution and the latex-coated mold is pre-dried to form a latex-coated mold. (c) Washing the latex-coated former with water. (d) Drying the latex-coated former. (e) The latex-coated former is vulcanized to solidify the latex and produce a glove. (f) chlorine washing the vulcanized gloves to remove residual protein and contaminants; (g) The gloves are washed with water to remove any residual chlorine. (h) dipping the glove into a secondary material dip bath containing a polyurethane polymer material; (i) Drying the glove. (j) The glove is demolded. Before carrying out the step (e), the steps (b) to (d) are carried out at least twice; the latex solution when steps (b) to (d) are performed for the first time contains synthetic rubber and biomass polysaccharides; the latex solution when steps (b) to (d) are performed a second time contains natural rubber; the latex solution before the steps (b) to (d) are performed has been subjected to a pre-vulcanization treatment, The pre-vulcanization treatment includes an alkaline protease addition step. How biomass gloves are manufactured.

2. Adding the alkaline protease at a weight percent concentration of 0.1% to 2.0%; the pH value is 9.5 to 10.5, The latex solution is stirred at room temperature for 12 to 48 hours. The method for producing the biomass glove according to claim 1

3. The pre-vulcanization treatment includes a step of irradiating the latex solution with ultraviolet light. The method for producing the biomass glove according to claim 2.

4. The ultraviolet radiation has a wavelength of 240 to 270 nm and an intensity of 1.0 to 15.0 mW / cm ２ Irradiate with an ultraviolet lamp for 5 seconds to 120 minutes. The method for producing the biomass glove according to claim 1.

5. The pre-vulcanization treatment includes a step of blending a polyol into the latex solution. The method for producing the biomass glove according to claim 1.

6. the weight percent concentration of the polyol is 10 to 30% of the total solids of the latex solution; The polyol reacts with the acid groups in the latex to form a network structure. The method for producing the biomass glove according to claim 5.

7. The step (e) is carried out at a temperature of 100 to 120°C for 18 to 25 minutes, The latex includes a vulcanizing agent and an accelerator. The method for producing the biomass glove according to claim 6.

8. Vulcanizing agents and accelerators include inorganic oxides, sulfur, zinc dibutyldithiocarbamate, and zinc diethyldithiocarbamate; The concentration of inorganic oxide is 0.6 to 2 phr; The concentration of sulfur is 0.6 to 2 phr; the concentration of zinc dibutyldithiocarbamate is 0.2 to 1 phr; The concentration of zinc diethyldithiocarbamate is 0.2 to 1 phr. The method for producing the biomass glove according to claim 7.

9. The step (f) comprises immersing the glove in a 100 to 1000 ppm chlorine solution for 60 to 300 seconds. The method for producing the biomass glove according to claim 1.

10. the secondary material dip bath contains a polyurethane polymer material at a concentration of 1 to 10%; The step (h) forms an inner layer having a thickness of about 0.01 to 0.04 mm. The method for producing the biomass glove according to claim 1.

11. The synthetic rubber is selected from the group consisting of nitrile rubber, chloroprene rubber, and isoprene rubber. The method for producing the biomass glove according to claim 1.

12. A hypoallergenic biomass glove having a multi-layer structure, the multi-layer structure includes a first layer, a second layer, and a third layer; the first layer comprises a combination of nitrile rubber, chloroprene rubber, or isoprene rubber and a polysaccharide biomass material; the second layer comprises a combination of natural or synthetic rubber and a polysaccharide biomass material; the third layer comprises a polyurethane inner layer; The glove has a biomass content of 3% to 40%, a tensile strength of 14 to 40 MPa, a breaking elongation of 350% to 800%, a protein extract concentration of less than 50 ppm, and a palm thickness of more than 0.03 mm. Hypoallergenic biomass gloves.

13. The thickness of the first layer is 0.01 mm to 0.2 mm. The hypoallergenic biomass glove according to claim 12.

14. The thickness of the second layer is 0.01 mm to 0.2 mm. The hypoallergenic biomass glove according to claim 12.

15. The thickness of the third layer is 0.01 mm to 0.04 mm. The hypoallergenic biomass glove according to claim 12.

16. The polyurethane inner layer provides a smooth, non-irritating surface, reducing the risk of triggering Type IV chemical allergies. The hypoallergenic biomass glove according to claim 12.

17. the polysaccharide biomass material of the first layer and the second layer is selected from the group consisting of cellulose and starch; The hypoallergenic biomass glove according to claim 12.

18. In the manufacturing process of the biomass glove, a protein extract concentration is reduced by a pre-vulcanization treatment process, The pre-vulcanization step includes the use of alkaline protease and ultraviolet irradiation. The hypoallergenic biomass glove according to claim 12.

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