A method for manufacturing a needle stick protective glove based on a textile substrate impregnation process

Abstract

The application relates to the technical field of protective equipment, and discloses a preparation method of a needle-penetration-resistant protective glove based on a textile substrate impregnation process, which comprises the following steps: substrate pretreatment, pretreatment liquid coating, polymer impregnation liquid preparation, impregnation treatment, plasticization and curing forming; through the introduction of surface-activated inorganic rigid particles and short fibers as a composite reinforcing phase, the two are interwoven and dispersed to form a composite reinforcing structure; the rigid particles improve the surface hardness and modulus of the coating to resist sharp object penetration, and the dispersed short fibers absorb and dissipate the penetration energy to improve the toughness; the two synergistically form a composite protective layer on the glove surface, thereby strengthening the needle-penetration-resistant ability of the product; the substrate is coated with a silane coupling agent pretreatment liquid before impregnation; active groups of the silane coupling agent can form chemical bonding with the fiber surface and the subsequent polymer coating, thereby improving the interfacial compatibility and bonding force of the polymer and the fiber substrate.

Description

Technical Field

[0001] This invention relates to the field of protective equipment technology, specifically to a method for preparing needle-resistant protective gloves based on a textile substrate impregnation process. Background Technology

[0002] Gloves are widely used in daily life, and their functions vary. Protective gloves are medical antibacterial and industrial protective equipment. In machining and equipment manufacturing operations, gloves protect the hands from cuts and injuries. The use of protective gloves reduces the wearer's exposure to external hazards, especially in police and medical settings where the number of hazards increases, requiring higher levels of functionality and strength from protective gloves.

[0003] Currently, in the field of preparing needle-resistant gloves using the impregnation process, due to the difficult-to-coordinate interaction between the surface characteristics of the textile substrate, the flow behavior of the polymer coating, and complex process parameters, the penetration depth and surface deposition of the polymer slurry between the fibers of the glove substrate are often unevenly distributed during the impregnation process. When the penetration is too deep, the gloves become stiff and lose flexibility. When the surface deposition is too thick, cracks or peeling are likely to occur during subsequent curing. It is impossible to provide a uniform and reliable puncture barrier while ensuring wearing flexibility.

[0004] Therefore, a method for preparing needle-puncture resistant protective gloves based on a textile substrate impregnation process is proposed to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for preparing puncture-resistant protective gloves based on a textile substrate impregnation process. This method solves the problem mentioned in the background art that the penetration depth and surface deposition of polymer slurry between the fibers of the glove substrate are often unevenly distributed, making it impossible to provide a uniform and reliable puncture-resistant barrier while ensuring wearing flexibility.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing needle-puncture resistant protective gloves based on a textile substrate impregnation process, comprising the following steps: Step 1: Substrate pretreatment. Select the knitted glove blank as the substrate and clean and dry it. Step 2: Pretreatment solution coating. A layer of pretreatment solution is evenly coated onto the surface of the pretreated knitted glove blank through an immersion process. Step 3: Preparation of polymer impregnation solution, which includes polymer emulsion, reinforcing material, functional additives and diluent; Step 4: Impregnation treatment. The pre-treated knitted glove blank is placed in the polymer impregnation solution for impregnation treatment, so that it can fully absorb the impregnation solution. Step 5: Plasticization and curing molding. The impregnated glove blank is placed on the hand mold, and after plasticization, drying and curing, a polymer protective coating is formed to obtain the needle-puncture resistant protective glove.

[0007] Preferably, the substrate pretreatment in step one includes the following steps: immersing the knitted glove blank in an aqueous solution containing a cleaning agent, ultrasonically treating it at 40-60°C for 10-20 minutes, then rinsing it repeatedly with deionized water 2-3 times to remove residual cleaning agent and impurities, and finally placing it in a forced-air drying oven and drying it at 60-80°C to a constant weight. The knitted glove blank is made of one of the following materials: high-strength nylon fiber, para-aramid fiber, or ultra-high molecular weight polyethylene fiber.

[0008] Preferably, the pretreatment solution in step two is prepared by mixing silane coupling agent, ethanol and water, wherein the volume concentration of silane coupling agent is 1%-3%, the volume ratio of ethanol to water is 7:3, the immersion time is 30-60 seconds, and after immersion, it is pre-dried at 80-100℃ for 1-2 minutes.

[0009] Preferably, the reinforcing material in step three is an inorganic rigid particle or short-cut fiber that has undergone surface modification treatment. The particle size of the reinforcing material is 1-50 micrometers. The surface modification treatment is as follows: the reinforcing material is placed in a plasma treatment device and treated with 200-500W power for 5-15 minutes under an argon atmosphere.

[0010] Preferably, the inorganic rigid particles are selected from alumina, silicon carbide, and boron nitride; the chopped fibers are selected from chopped aramid fibers, chopped carbon fibers, or chopped glass fibers.

[0011] Preferably, in step three, the polymer impregnation solution is made from the following raw materials in parts by weight: 100 parts polymer emulsion, 20-50 parts reinforcing material, 5-15 parts functional additives, and 10-30 parts diluent. The polymer emulsion is an aqueous polyurethane dispersion, nitrile latex, natural latex, or a mixture thereof. The functional additives include dispersants, thickeners, wetting agents, and defoamers. The dispersant is an anionic or nonionic dispersant. The thickener is selected from polyurethane thickeners, acrylic thickeners, or cellulose thickeners. The wetting agent is an organosilicon surfactant or an acetylenic diol surfactant. The defoamer is an organosilicon defoamer or a mineral oil defoamer. The diluent is deionized water.

[0012] Preferably, the preparation method of the polymer impregnation solution in step three is as follows: First, the polymer emulsion and half of the diluent are added to a reaction vessel equipped with stirring and temperature control. The mixture is stirred and mixed for 5-10 minutes at 25-35℃ and 300-500 r / min to form a uniform premix. Then, the reinforcing material is slowly added to the premix while the stirring speed is increased to 800-1200 r / min and stirred continuously for 20-40 minutes. Next, the functional additive is added and stirred for another 10-20 minutes at the same speed. Finally, the remaining diluent is added, the stirring speed is adjusted to 200-400 r / min, and the mixture is stirred for 5-10 minutes to obtain the polymer impregnation solution. The temperature must be controlled not to exceed 40℃ throughout the entire process.

[0013] Preferably, the impregnation process in step four includes the following steps: completely immersing the knitted glove blank coated with pretreatment liquid and pre-dried in polymer impregnation liquid, maintaining it under vacuum conditions of 0.1-0.3MPa for 2-5 minutes to remove air from the fiber gaps; after releasing the vacuum, continuing to let it stand and impregnate for 5-10 minutes under normal pressure; then lifting the glove blank out of the liquid surface and centrifuging it in a low-speed centrifuge at a speed of 200-500r / min for 10-20 seconds to remove excess impregnation liquid from the surface.

[0014] Preferably, the plasticizing and curing molding in step five includes the following steps: quickly placing the impregnated and dehydrated glove blank onto a hand mold preheated to 50-70°C, first pre-plasticizing and shaping it in an oven at 80-100°C for 2-4 minutes, then transferring it to a circulating hot air oven at 120-150°C for final curing and cross-linking for 8-12 minutes, demolding it after curing, and allowing it to cool naturally to room temperature to obtain the finished needle-resistant protective gloves.

[0015] Preferably, between steps four and five, a draining and pre-drying step is also included: the glove blank after centrifugation and dehydration is transferred to a draining area with temperature and humidity control, and left to drain for 5-10 minutes at a temperature of 25-35℃ and a relative humidity of 40%-60%, and then pre-dryed for 2-4 minutes under circulating hot air at 60-80℃.

[0016] Compared with the prior art, the present invention provides a method for preparing needle-puncture resistant protective gloves based on a textile substrate impregnation process, which has the following beneficial effects: 1. In this invention, surface-activated inorganic rigid particles and chopped fibers are introduced as composite reinforcing phases. The two are interwoven and dispersed to form a composite reinforcing structure. The rigid particles increase the surface hardness and modulus of the coating to resist the penetration of sharp objects, while the dispersed chopped fibers absorb and dissipate the puncture energy and improve toughness. The two work together to form a composite protective layer on the surface of the glove, which strengthens the product's resistance to needle puncture.

[0017] 2. In this invention, the substrate is pretreated with a silane coupling agent before impregnation. The active groups of the agent can form chemical bonds with the fiber surface and subsequent polymer coating, improving the interfacial compatibility and bonding force between the polymer and the fiber substrate. The subsequent impregnation process allows the impregnation liquid to initially penetrate into the fiber bundle. Combined with the draining and pre-drying steps, the slurry is evenly distributed and initially stabilized between the fibers and on the surface. This series of processes works synergistically to ensure that a uniform and continuous bonding interface is formed between the protective coating and the textile substrate, preventing coating peeling and cracking caused by stress concentration during use.

[0018] 3. In this invention, by implementing a phased plasticizing and curing process on the impregnated glove blank, combined with the rational selection and compounding of polymer emulsion and functional additives in the slurry formulation, the final protective coating not only has puncture resistance but also maintains flexibility and fit. The phased heating and curing ensures the orderly cross-linking of polymer molecules and the release of internal stress, while the selected substrate and the formed polymer coating ensure the overall bendability of the glove, thereby enabling the glove to maintain hand flexibility and wearing comfort while providing reliable protection. Detailed Implementation

[0019] 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.

[0020] Example 1: A method for preparing needle-puncture resistant protective gloves based on a textile substrate impregnation process, comprising the following steps: Step 1: Substrate pretreatment. Select the knitted glove blank as the substrate and clean and dry it. Step 2: Pretreatment solution coating. A layer of pretreatment solution is evenly coated onto the surface of the pretreated knitted glove blank through an immersion process. Step 3: Preparation of polymer impregnation solution, which includes polymer emulsion, reinforcing material, functional additives and diluent; Step 4: Impregnation treatment. The pre-treated knitted glove blank is placed in the polymer impregnation solution for impregnation treatment, so that it can fully absorb the impregnation solution. Step 5: Plasticization and curing molding. The impregnated glove blank is placed on the hand mold, and after plasticization, drying and curing, a polymer protective coating is formed to obtain the needle-puncture resistant protective glove.

[0021] The substrate pretreatment in step one includes the following steps: immersing the knitted glove blank in an aqueous solution containing detergent, ultrasonically treating it at 40°C for 10 minutes, then rinsing it twice with deionized water to remove residual detergent and impurities, and finally placing it in a forced-air drying oven and drying it at 60°C to constant weight. The knitted glove blank is made of high-strength nylon fiber.

[0022] The pretreatment solution in step two is made by mixing silane coupling agent, ethanol and water, wherein the volume concentration of silane coupling agent is 1%, the volume ratio of ethanol to water is 7:3, the immersion time is 30 seconds, and after immersion, it is pre-dried at 80°C for 1 minute.

[0023] The reinforcing material in step three is an inorganic rigid particle with a surface-modified particle size of 10 micrometers. The surface modification process involves placing the reinforcing material in a plasma treatment device and treating it at 200 kW for 5 minutes under an argon atmosphere.

[0024] The inorganic rigid particles are selected from alumina; the chopped fibers are selected from chopped aramid fibers.

[0025] In step three, the polymer impregnation solution is made from the following raw materials in parts by weight: 100 parts polymer emulsion, 20 parts reinforcing material, 5 parts functional additives, and 10 parts diluent; The polymer emulsion is an aqueous polyurethane dispersion. The functional additives include dispersants, thickeners, wetting agents, and defoamers. The dispersant is an anionic dispersant, the thickener is selected from polyurethane thickeners, the wetting agent is an organosilicon surfactant, the defoamer is an organosilicon defoamer, and the diluent is deionized water.

[0026] The preparation method of the polymer impregnation solution in step three is as follows: First, add the polymer emulsion and half of the diluent to a reaction vessel equipped with stirring and temperature control. Stir and mix for 5 minutes at 25℃ and 300r / min to form a uniform premix. Then, slowly add the reinforcing material to the premix while increasing the stirring speed to 800r / min and stirring continuously for 20 minutes. Next, add the functional additives and continue stirring for 10 minutes at the same speed. Finally, add the remaining diluent, adjust the stirring speed to 200r / min, and stir for 5 minutes to obtain the polymer impregnation solution. The temperature must be controlled not to exceed 40℃ throughout the entire process.

[0027] The impregnation process in step four includes the following steps: the knitted glove blank coated with pretreatment solution and pre-dried is completely immersed in the polymer impregnation solution and kept under a vacuum of 0.1 MPa for 2 minutes to remove air from the fiber gaps; after the vacuum is released, it is left to stand and impregnate for 5 minutes under normal pressure; then the glove blank is lifted out of the liquid and centrifuged at 200 r / min for 10 seconds in a low-speed centrifuge to remove excess impregnation solution from the surface.

[0028] Step 5, plasticizing and curing, includes the following steps: the impregnated and dehydrated glove blank is quickly placed on a hand mold preheated to 50°C, pre-plasticized and shaped in an 80°C oven for 2 minutes, and then transferred to a 120°C circulating hot air oven for final curing and cross-linking for 8 minutes. After curing, the glove is demolded and allowed to cool naturally to room temperature to obtain the finished needle-resistant protective glove.

[0029] Between steps four and five, there is also a draining and pre-drying step: the glove blank after centrifugation and dehydration is transferred to a draining area with temperature and humidity control, and left to drain for 5 minutes at a temperature of 25°C and a relative humidity of 40%, and then pre-dryed for 2 minutes under circulating hot air at 60°C.

[0030] Example 2: A method for preparing needle-puncture resistant protective gloves based on a textile substrate impregnation process, comprising the following steps: Step 1: Substrate pretreatment. Select the knitted glove blank as the substrate and clean and dry it. Step 2: Pretreatment solution coating. A layer of pretreatment solution is evenly coated onto the surface of the pretreated knitted glove blank through an immersion process. Step 3: Preparation of polymer impregnation solution, which includes polymer emulsion, reinforcing material, functional additives and diluent; Step 4: Impregnation treatment. The pre-treated knitted glove blank is placed in the polymer impregnation solution for impregnation treatment, so that it can fully absorb the impregnation solution. Step 5: Plasticization and curing molding. The impregnated glove blank is placed on the hand mold, and after plasticization, drying and curing, a polymer protective coating is formed to obtain the needle-puncture resistant protective glove.

[0031] The substrate pretreatment in step one includes the following steps: immersing the knitted glove blank in an aqueous solution containing detergent, ultrasonically treating it at 50°C for 15 minutes, then rinsing it twice with deionized water to remove residual detergent and impurities, and finally placing it in a forced-air drying oven and drying it at 70°C to constant weight. The material of the knitted glove blank is made of para-aramid fiber.

[0032] The pretreatment solution in step two is made by mixing silane coupling agent, ethanol and water, wherein the volume concentration of silane coupling agent is 2%, the volume ratio of ethanol to water is 7:3, the immersion time is 45 seconds, and after immersion, it is pre-dried at 90°C for 1.5 minutes.

[0033] The reinforcing material in step three is short-cut fiber with surface modification treatment. The particle size of the reinforcing material is 30 micrometers. The surface modification treatment is as follows: the reinforcing material is placed in a plasma treatment device and treated with 350W power for 10 minutes under an argon atmosphere.

[0034] The inorganic rigid particles are selected from silicon carbide; the chopped fibers are selected from chopped carbon fibers.

[0035] In step three, the polymer impregnation solution is made from the following raw materials in parts by weight: 100 parts polymer emulsion, 35 parts reinforcing material, 10 parts functional additives, and 20 parts diluent. The polymer emulsion is nitrile latex, and the functional additives include dispersants, thickeners, wetting agents, and defoamers. The dispersant is a nonionic dispersant, the thickener is selected from acrylic thickeners, the wetting agent is an acetylenic diol surfactant, the defoamer is a mineral oil defoamer, and the diluent is deionized water.

[0036] The preparation method of the polymer impregnation solution in step three is as follows: First, add the polymer emulsion and half of the diluent to a reaction vessel equipped with stirring and temperature control. Stir and mix for 7 minutes at 30℃ and 400r / min to form a uniform premix. Then, slowly add the reinforcing material to the premix while increasing the stirring speed to 1000r / min and stirring continuously for 30 minutes. Then, add the functional additives and continue stirring for 12 minutes at the same speed. Finally, add the remaining diluent, adjust the stirring speed to 300r / min, and stir for 7 minutes to obtain the polymer impregnation solution. The temperature must be controlled not to exceed 40℃ throughout the entire process.

[0037] The impregnation process in step four includes the following steps: the knitted glove blank coated with pretreatment solution and pre-dried is completely immersed in the polymer impregnation solution and kept under a vacuum of 0.2 MPa for 3 minutes to remove air from the fiber gaps; after the vacuum is released, it is left to stand and impregnate for 7 minutes under normal pressure; then the glove blank is lifted out of the liquid and centrifuged at 350 r / min for 15 seconds in a low-speed centrifuge to remove excess impregnation solution from the surface.

[0038] Step 5, plasticizing and curing, includes the following steps: the glove blank after impregnation and dehydration is quickly placed on a hand mold preheated to 60°C, and then pre-plasticized and shaped in a drying tunnel at 90°C for 3 minutes. Then, it is transferred to a circulating hot air oven at 135°C for final curing and cross-linking for 10 minutes. After curing, it is demolded and allowed to cool naturally to room temperature to obtain the finished needle-resistant protective glove.

[0039] Between steps four and five, there is also a draining and pre-drying step: the glove blank after centrifugation and dehydration is transferred to a draining area with temperature and humidity control, and left to drain for 7 minutes at a temperature of 30°C and a relative humidity of 50%, and then pre-dryed for 3 minutes under circulating hot air at 70°C.

[0040] Example 3: A method for preparing needle-puncture resistant protective gloves based on a textile substrate impregnation process, comprising the following steps: Step 1: Substrate pretreatment. Select the knitted glove blank as the substrate and clean and dry it. Step 2: Pretreatment solution coating. A layer of pretreatment solution is evenly coated onto the surface of the pretreated knitted glove blank through an immersion process. Step 3: Preparation of polymer impregnation solution, which includes polymer emulsion, reinforcing material, functional additives and diluent; Step 4: Impregnation treatment. The pre-treated knitted glove blank is placed in the polymer impregnation solution for impregnation treatment, so that it can fully absorb the impregnation solution. Step 5: Plasticization and curing molding. The impregnated glove blank is placed on the hand mold, and after plasticization, drying and curing, a polymer protective coating is formed to obtain the needle-puncture resistant protective glove.

[0041] The substrate pretreatment in step one includes the following steps: immersing the knitted glove blank in an aqueous solution containing a cleaning agent, ultrasonically treating it at 60°C for 20 minutes, then rinsing it repeatedly with deionized water 3 times to remove residual cleaning agent and impurities, and finally placing it in a forced-air drying oven and drying it at 80°C to constant weight. The material of the knitted glove blank is woven from ultra-high molecular weight polyethylene fiber.

[0042] The pretreatment solution in step two is made by mixing silane coupling agent, ethanol and water, wherein the volume concentration of silane coupling agent is 3%, the volume ratio of ethanol to water is 7:3, the immersion time is 60 seconds, and after immersion, it is pre-dried at 100°C for 2 minutes.

[0043] The reinforcing material in step three is an inorganic rigid particle with a surface-modified particle size of 50 micrometers. The surface modification process involves placing the reinforcing material in a plasma treatment device and treating it for 15 minutes at a power of 500W under an argon atmosphere.

[0044] The inorganic rigid particles are selected from boron nitride; the chopped fibers are selected from chopped glass fibers.

[0045] In step three, the polymer impregnation solution is made from the following raw materials in parts by weight: 100 parts polymer emulsion, 50 parts reinforcing material, 15 parts functional additives, and 30 parts diluent. The polymer emulsion is a mixture of aqueous polyurethane dispersion and natural rubber latex. The functional additives include dispersants, thickeners, wetting agents and defoamers. The dispersant is anionic, the thickener is selected from cellulose thickeners, the wetting agent is an organosilicon surfactant, the defoamer is an organosilicon defoamer, and the diluent is deionized water.

[0046] The preparation method of the polymer impregnation solution in step three is as follows: First, add the polymer emulsion and half of the diluent to a reaction vessel equipped with stirring and temperature control. Stir and mix for 10 minutes at 35℃ and 500r / min to form a uniform premix. Then, slowly add the reinforcing material to the premix while increasing the stirring speed to 1200r / min and stirring for 40 minutes. Next, add the functional additive and continue stirring for 20 minutes at the same speed. Finally, add the remaining diluent, adjust the stirring speed to 400r / min, and stir for 10 minutes to obtain the polymer impregnation solution. The temperature must be controlled not to exceed 40℃ throughout the entire process.

[0047] The impregnation process in step four includes the following steps: the knitted glove blank coated with pretreatment solution and pre-dried is completely immersed in the polymer impregnation solution and kept under a vacuum of 0.3 MPa for 5 minutes to remove air from the fiber gaps; after the vacuum is released, it is left to stand and impregnate for 10 minutes under normal pressure; then the glove blank is lifted out of the liquid and centrifuged at 500 r / min for 20 seconds in a low-speed centrifuge to remove excess impregnation solution from the surface.

[0048] Step 5, plasticizing and curing, includes the following steps: the impregnated and dehydrated glove blank is quickly placed on a hand mold preheated to 70°C, pre-plasticized and shaped in a 100°C oven for 4 minutes, and then transferred to a 150°C circulating hot air oven for final curing and cross-linking for 12 minutes. After curing, the glove is demolded and allowed to cool naturally to room temperature to obtain the finished needle-resistant protective glove.

[0049] Between steps four and five, there is also a draining and pre-drying step: the glove blank after centrifugation and dehydration is transferred to a draining area with temperature and humidity control, and left to drain for 10 minutes at a temperature of 35°C and a relative humidity of 60%, and then pre-dryed for 4 minutes under circulating hot air at 80°C.

[0050] Comparative Example 1: The difference between this comparative example and Example 1 is that no reinforcing material was added when preparing the impregnation solution in this comparative example.

[0051] Comparative Example 2 differs from Example 1 in that vacuum impregnation was not performed during the impregnation process in this comparative example.

[0052] Comparative Example 3 differs from Example 1 in that the pre-treatment liquid coating was not applied to the knitted glove blank in this comparative example.

[0053] Comparative Example 4 differs from Example 1 in that no functional additives were added when preparing the impregnation solution in this comparative example.

[0054] The puncture-resistant protective gloves prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to performance tests. The test items and test methods are as follows: For the puncture resistance test, after the sample has been conditioned for 24 hours at a temperature of 23°C and a relative humidity of 50%, a conical puncture probe is used to vertically puncture the palm of the glove at a constant speed of 100 mm / min until it penetrates, and the maximum puncture force required is recorded. For coating adhesion testing, a 25 mm diameter coated disc was prepared on the dipped surface of the glove. The adhesive tape method was used to test the coating. Standard adhesive tape was tightly adhered to the coating surface and then quickly peeled off. The percentage of the coating area that was peeled off was observed and recorded. For the color fastness to rubbing test, a rubbing tester is used. A standard rubbing cloth is rubbed 10 times in a 180-degree arc on the dipped surface of the glove. The rubbing load is 500 grams. Then, a standard light source box is used to compare the color change before and after rubbing to evaluate the color fastness grade. The color fastness grades are divided into 5 levels, with level 5 being the highest level and level 1 being the lowest level. For the puncture resistance retention test, the glove sample was placed in a constant temperature and humidity environment of 70℃ and 85% for 168 hours for aging treatment. After being taken out and restored to room temperature, the puncture resistance test was carried out again. The ratio of the puncture force after aging to the initial puncture force was calculated and expressed as a percentage.

[0055] The test data of the needle-resistant protective gloves prepared in Examples 1-3 and Comparative Examples 1-4 are recorded in the table below:

[0056] By comparing and analyzing the data in Table 1, it can be seen that the needle-puncture resistant protective gloves prepared using the processes in Examples 1-3 have superior overall performance compared to the needle-puncture resistant protective gloves prepared using the processes in Comparative Examples 1-4. This indicates that by introducing surface-activated inorganic rigid particles and chopped fibers as composite reinforcing phases, the two interweave and disperse to form a composite reinforcing structure. The rigid particles increase the surface hardness and modulus of the coating to resist the penetration of sharp objects, while the dispersed chopped fibers absorb and dissipate puncture energy, improving toughness. The two work synergistically to form a composite protective layer on the glove surface, enhancing the needle-puncture resistance of the product. Before impregnation, the substrate is pretreated with a silane coupling agent, whose active groups can form chemical bonds with the fiber surface and subsequent polymer coating, improving the interfacial compatibility and adhesion between the polymer and the fiber substrate. The subsequent impregnation process allows the impregnation solution to initially penetrate into the fiber bundle. Combined with the draining and pre-drying steps, the sizing agent is evenly distributed and initially stabilized between the fibers and on the surface. This series of processes works synergistically to ensure a uniform and continuous bonding interface between the protective coating and the textile matrix, preventing coating peeling and cracking caused by stress concentration during use. By implementing a staged plasticizing and curing process on the glove blank after impregnation, combined with the rational selection and compounding of polymer emulsions and functional additives in the sizing agent formulation, the final protective coating maintains flexibility and fit while possessing puncture resistance. Staged temperature curing ensures the orderly cross-linking of polymer molecules and the release of internal stress, while the selected substrate and the formed polymer coating ensure the overall flexibility of the glove, thus providing reliable protection while maintaining hand flexibility and wearing comfort.

[0057] By comparing and analyzing the relevant data in the table, it can be seen that the puncture-resistant protective gloves prepared by the process of this invention not only have excellent puncture resistance, but also exhibit good coating adhesion, abrasion resistance, and reliable long-term protection retention. This demonstrates that the glove manufacturing process provided by this invention can solve the problem of balancing protective performance, wearing comfort, and durability.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for preparing needle-puncture resistant protective gloves based on a textile substrate impregnation process, characterized in that: Includes the following steps: Step 1: Substrate pretreatment. Select the knitted glove blank as the substrate and clean and dry it. Step 2: Pretreatment solution coating. A layer of pretreatment solution is evenly coated onto the surface of the pretreated knitted glove blank through an immersion process. Step 3: Preparation of polymer impregnation solution, which includes polymer emulsion, reinforcing material, functional additives and diluent; Step 4: Impregnation treatment. The pre-treated knitted glove blank is placed in the polymer impregnation solution for impregnation treatment, so that it can fully absorb the impregnation solution. Step 5: Plasticization and curing molding. The impregnated glove blank is placed on the hand mold, and after plasticization, drying and curing, a polymer protective coating is formed to obtain the needle-puncture resistant protective glove.

2. The method for preparing a needle-puncture resistant protective glove based on a textile substrate impregnation process according to claim 1, characterized in that: The substrate pretreatment in step one includes the following steps: immersing the knitted glove blank in an aqueous solution containing a cleaning agent, ultrasonically treating it at 40-60℃ for 10-20 minutes, then rinsing it repeatedly with deionized water 2-3 times to remove residual cleaning agent and impurities, and finally placing it in a forced-air drying oven and drying it at 60-80℃ to constant weight. The knitted glove blank is made of one of the following materials: high-strength nylon fiber, para-aramid fiber, or ultra-high molecular weight polyethylene fiber.

3. The method for preparing a needle-puncture resistant protective glove based on a textile substrate impregnation process according to claim 1, characterized in that: The pretreatment solution in step two is made by mixing silane coupling agent, ethanol and water, wherein the volume concentration of silane coupling agent is 1%-3%, the volume ratio of ethanol to water is 7:3, the impregnation time is 30-60 seconds, and after impregnation, it is pre-dried at 80-100℃ for 1-2 minutes.

4. The method for preparing a needle-puncture resistant protective glove based on a textile substrate impregnation process according to claim 1, characterized in that: The reinforcing material in step three is an inorganic rigid particle or short-cut fiber that has undergone surface modification treatment. The particle size of the reinforcing material is 1-50 micrometers. The surface modification treatment is as follows: the reinforcing material is placed in a plasma treatment device and treated with 200-500W power for 5-15 minutes under an argon atmosphere.

5. The method for preparing a needle-puncture resistant protective glove based on a textile substrate impregnation process according to claim 4, characterized in that: The inorganic rigid particles are selected from one of alumina, silicon carbide, and boron nitride; the chopped fibers are selected from one of chopped aramid fibers, chopped carbon fibers, or chopped glass fibers.

6. The method for preparing a needle-puncture resistant protective glove based on a textile substrate impregnation process according to claim 1, characterized in that: In step three, the polymer impregnation solution is made from the following raw materials in parts by weight: 100 parts polymer emulsion, 20-50 parts reinforcing material, 5-15 parts functional additives, and 10-30 parts diluent. The polymer emulsion is an aqueous polyurethane dispersion, nitrile latex, natural latex, or a mixture thereof. The functional additives include dispersants, thickeners, wetting agents, and defoamers. The dispersant is an anionic or nonionic dispersant. The thickener is selected from polyurethane thickeners, acrylic thickeners, or cellulose thickeners. The wetting agent is an organosilicon surfactant or an acetylenic diol surfactant. The defoamer is an organosilicon defoamer or a mineral oil defoamer. The diluent is deionized water.

7. A method for preparing a needle-puncture resistant protective glove based on a textile substrate impregnation process according to claim 6, characterized in that: The preparation method of the polymer impregnation solution in step three is as follows: First, add the polymer emulsion and half of the diluent to a reaction vessel equipped with stirring and temperature control. Stir and mix for 5-10 minutes at 25-35℃ and 300-500 r / min to form a uniform premix. Then, slowly add the reinforcing material to the premix while increasing the stirring speed to 800-1200 r / min and stirring continuously for 20-40 minutes. Next, add the functional additives and continue stirring at the same speed for 10-20 minutes. Finally, add the remaining diluent, adjust the stirring speed to 200-400 r / min, and stir for 5-10 minutes to obtain the polymer impregnation solution. The temperature must be controlled not to exceed 40℃ throughout the entire process.

8. The method for preparing a needle-puncture resistant protective glove based on a textile substrate impregnation process according to claim 1, characterized in that: The impregnation process in step four includes the following steps: the knitted glove blank coated with pretreatment solution and pre-dried is completely immersed in polymer impregnation solution and kept under vacuum of 0.1-0.3MPa for 2-5 minutes to remove air from the fiber gaps; after the vacuum is released, it is allowed to stand and impregnate for 5-10 minutes under normal pressure; then the glove blank is lifted out of the liquid and centrifuged in a low-speed centrifuge at a speed of 200-500r / min for 10-20 seconds to remove excess impregnation solution from the surface.

9. A method for preparing a needle-puncture resistant protective glove based on a textile substrate impregnation process according to claim 1, characterized in that: The plasticizing and curing process in step five includes the following steps: the impregnated and dehydrated glove blank is quickly placed on a hand mold preheated to 50-70°C, and then pre-plasticized and shaped in an oven at 80-100°C for 2-4 minutes. After that, it is transferred to a circulating hot air oven at 120-150°C for final curing and cross-linking for 8-12 minutes. After curing, the glove is demolded and allowed to cool naturally to room temperature to obtain the finished needle-resistant protective glove.

10. A method for preparing a needle-puncture resistant protective glove based on a textile substrate impregnation process according to claim 9, characterized in that: Between steps four and five, there is also a draining and pre-drying step: the glove blank after centrifugation and dehydration is transferred to a draining area with temperature and humidity control, and left to drain for 5-10 minutes at a temperature of 25-35℃ and a relative humidity of 40%-60%, and then pre-dryed for 2-4 minutes under circulating hot air at 60-80℃.

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