Polyvinyl alcohol chemical resistant glove and method of making

Abstract

The application discloses a polyvinyl alcohol chemical-proof glove and a manufacturing method thereof, and belongs to the field of glove materials and processing technology. In order to solve the problem of uneven flexibility and thickness of the existing gloves, the polyvinyl alcohol chemical-proof glove and the manufacturing method thereof are provided, and the glove comprises an inner lining layer and a PVA outer layer, and a water-based latex blending layer is formed between the PVA outer layer and the inner lining layer. The water-based latex blending layer is made of raw materials in the following weight proportions: PVA: 10-90; water-based latex: 140-200; glycerol: 8.0-15; polyglycerol: 5.0-15; high-molecular water-absorbing resin I: 2.0-4.0; defoaming agent: 0.5-1.5; bridging agent I: 0.5-2.0; and water: 300-400. The application can effectively reduce the probability of hydrogen bond formation between PVA molecular chains, destroy the regular structure of the film, reduce the crystallinity, thereby reducing the hardness of PVA, and improving the softness and thickness uniformity of the glove.

Description

Technical Field

[0001] This invention relates to a polyvinyl alcohol chemical-resistant glove and its manufacturing method, belonging to the field of glove materials and processing technology. Background Technology

[0002] Chemical protective gloves, as protective equipment for production workers, are primarily used to protect the hands when exposed to chemical solvents. Different materials are used for chemical protective gloves depending on the composition of the chemicals being handled, and they are applied in chemical, printing, and other work environments. Although there are many types of chemical protective gloves available, most are uncomfortable to use or make it difficult for operators to control their hands due to their stiffness and lack of flexibility.

[0003] For chemical protective gloves, existing nitrile gloves often suffer from quality problems such as glue seepage and glue run-through during production and processing, resulting in poor performance in terms of pressure resistance and sealing, which seriously affects their chemical solvent resistance as chemical protective gloves. There are also chemical protective gloves made of polyvinyl alcohol (PVA) and chloroprene. PVA gloves are the only gloves suitable for handling strong organic solvents. In terms of chemical protection, they can make up for the shortcomings of chloroprene and butyl gloves. Production operators in the chemical industry who are exposed to toxic solvents such as toluene and xylene often need to wear protective chemical protective gloves to protect them from corrosion or prevent their hands from coming into contact with harmful substances. They can also be well applied. For example, a PVA chemical protective glove disclosed in the prior art Chinese patent application (publication number: CN112126016A) uses a three-layer impregnation process to prepare the PVA-lined glove. The process is complex, and the slurry used in the three impregnations is all PVA slurry, resulting in low production efficiency. Moreover, because pure PVA slurry is prone to seepage, it can easily cause the lining to permeate. Furthermore, due to the multiple impregnations, the glove is thicker at the palm and thinner at the cuff, resulting in a rough appearance. It still has defects such as insufficient protective performance and uneven glove hardness. At the same time, it is essentially a glove made of PVA slurry material. With all three layers made of pure PVA material, the overall thickness is large. In addition, the PVA molecular chain contains a large number of hydrogen bonds. The strong forces between hydrogen bonds can easily form regular crystalline regions, making the PVA film hard and brittle, and still causing problems such as stiffness of the glove during use. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a polyvinyl alcohol chemical-resistant glove and its manufacturing method, solving the problem of how to achieve good softness and uniform thickness of the glove.

[0005] One of the objectives of this invention is achieved through the following technical solution: a polyvinyl alcohol (PVA) chemical-resistant glove, comprising an inner lining layer and a PVA outer layer, wherein an aqueous latex blend layer is formed between the PVA outer layer and the inner lining layer, and the aqueous latex blend layer is made from raw materials comprising the following parts by weight ratio:

[0006] PVA: 10-90; Water-based latex: 140-200; Glycerin: 8.0-15; Polyglycerol: 5.0-15; Superabsorbent polymer: 2.0-4.0; Defoamer: 0.5-1.5; Crosslinking agent: 0.5-2.0; Water: 300-400.

[0007] By improving the layer structure of polyvinyl alcohol (PVA) gloves, a water-based latex blend layer is formed between the inner lining and the outer PVA layer. This effectively addresses the stiffness issue inherent in gloves made entirely of PVA. Specifically, the water-based latex blend layer bonds the inner lining to the outer PVA layer. The softer molecular chains of the water-based latex are positioned between the inner lining and the outer PVA layer, allowing direct contact between the outer PVA layer and the intermediate water-based latex blend layer. This effectively disperses the latex within the PVA matrix, reducing the probability of hydrogen bonding between PVA molecular chains, disrupting the regular structure of the film, and decreasing crystallinity. This reduces the hardness of the PVA, improves its softness, and effectively solves the problem of poor film formation and difficulty in controlling the film formation during the molding process when using only PVA. The uniform thickness of the sleeve ensures uniform overall hardness and quality. Furthermore, the addition of a crosslinking agent allows it to react with the hydroxyl groups in PVA during glove manufacturing, bridging two or more PVA molecules together to form a high-molecular-weight three-dimensional network structure. This effectively improves the overall water and solvent resistance. The formation of a water-based latex blend layer in the middle effectively avoids PVA seepage defects and achieves overall softness in the PVA glove. The water-based latex blend layer structure also provides excellent adhesion to the outer PVA material, ensuring overall interlayer strength.

[0008] In the aforementioned polyvinyl alcohol (PVA) chemical-resistant gloves, preferably, the PVA content in the water-based latex blend layer is 35-60% by weight. This improves the interlayer adhesion, as the water-based latex blend layer contains a certain amount of PVA, which is equivalent to the presence of hydroxyl groups. These hydroxyl groups allow for a strong bond between the PVA and the outer PVA layer, resulting in stronger overall adhesion, reduced delamination under external forces, and overall high strength.

[0009] In the aforementioned polyvinyl alcohol (PVA) chemical-resistant gloves, preferably, the water-based latex is selected from one or more of natural rubber, butyl rubber, nitrile rubber, and water-based PU. By using the aforementioned water-based latex, the PVA gloves can achieve the advantage of good overall softness. Furthermore, blending the water-based latex with PVA allows the intermediate layer to gel more quickly during manufacturing under the action of the coagulant on the lining, reducing fluidity and enabling it to gel rapidly on the lining surface. This reduces slurry seepage and dripping, resulting in improved overall uniformity and a more uniform overall glove thickness, especially in the palm area.

[0010] In the aforementioned polyvinyl alcohol chemical-resistant gloves, a superabsorbent polymer (SAP) is used, which possesses both water-absorbing and water-retaining properties, thereby improving the gloves' softness and enhancing user comfort. The SAP contains strong hydrophilic groups such as carboxyl groups, sulfonic acid groups, and polymeric carboxylates. Preferably, the SAP is selected from one or more of acrylamide-acrylonitrile-acrylic acid terpolymers, starch-acrylate polymers, starch-acrylonitrile graft copolymers, and polyacrylates.

[0011] In the above-mentioned polyvinyl alcohol chemical-resistant gloves, preferably, the crosslinking agent is selected from one or more of epoxy silane polymers, blocked isocyanates, melamine, and aziridine.

[0012] The use of a crosslinking agent allows it to react with the hydroxyl groups on PVA during the glove molding process, forming a three-dimensional network structure, which further effectively improves water and solvent resistance. As a further preferred option, the first crosslinking agent is a self-blocking isocyanate with a deblocking temperature of 90℃~110℃. This crosslinking agent can coexist stably with resins containing active groups (hydroxyl, carboxyl, amino, epoxy, etc.) for a long time at room temperature. After heating to the deblocking temperature, the crosslinking agent releases -NCO groups and reacts with hydroxyl, carboxyl, amino, and other groups on the resin molecular chain to form crosslinks, which can significantly improve the solvent and water resistance of waterborne PVA.

[0013] In the aforementioned polyvinyl alcohol chemical-resistant gloves, preferably, the raw materials also include 0.5 to 1.0 parts by weight of a bactericide and 1.0 to 2.0 parts by weight of a colorant. To enhance the functionality of the gloves, bactericides and colorants can be added, which can better improve the antibacterial properties of the gloves and diversify the color requirements. The bactericide and colorant can be selected according to actual needs.

[0014] In the aforementioned polyvinyl alcohol (PVA) chemical-resistant gloves, preferably, the PVA outer layer is made from raw materials comprising the following parts by weight:

[0015] PVA: 45-55; Glycerin: 5.0-10; Polyglycerol: 10-16; Superabsorbent polymer II: 2.0-4.0; Defoamer: 0.5-1.5; Crosslinking agent II: 0.5-2.0; Water: 400-500.

[0016] In the above-mentioned polyvinyl alcohol chemical-resistant gloves, preferably, the superabsorbent polymer in the raw material of the PVA outer layer is selected from one or more of acrylamide-acrylonitrile-acrylic acid terpolymer, starch acrylate polymer, starch-acrylonitrile graft copolymer and polyacrylate.

[0017] In the above-mentioned polyvinyl alcohol chemical-resistant gloves, preferably, the crosslinking agent in the raw material of the PVA outer layer is selected from one or more of blocked isocyanates, epoxy silane polymers, melamine and aziridine.

[0018] The terms "superabsorbent polymer 1" and "superabsorbent polymer 2" mentioned above are merely for better distinction and description and do not have any special meaning. They both refer to superabsorbent polymer materials. In actual applications, the superabsorbent polymers in the two terms may be the same or different. Similarly, "crosslinker 1" and "crosslinker 2" mentioned above are also merely for better distinction and description, and may be the same or different in actual use.

[0019] In the above-mentioned polyvinyl alcohol chemical-resistant gloves, preferably, the raw material of the PVA outer layer also includes 0.5 to 1.0 parts by weight of bactericide and 1.0 to 2.0 parts by weight of color paste.

[0020] The second objective of this invention is achieved through the following technical solution: a method for manufacturing polyvinyl alcohol chemical-resistant gloves, the method comprising the following steps:

[0021] A. An inner lining layer is fitted onto a glove mold. After heating the mold, it is impregnated with a coagulant and dried. Then, it is sprayed or immersed in an aqueous latex blending slurry to form an aqueous latex layer. After drying, a semi-finished glove is formed with an aqueous latex layer on the surface of the inner lining layer. The aqueous latex blending slurry comprises the following raw materials in the indicated weight proportions:

[0022] PVA: 10-60; Water-based latex: 140-200; Glycerin: 8.0-15; Polyglycerol: 5.0-15; Superabsorbent polymer: 2.0-4.0; Defoamer: 0.5-1.5; Crosslinking agent: 0.5-2.0; Water: 300-400;

[0023] B. Spray or immerse in PVA slurry to form an outer PVA layer on the surface of the water-based latex layer, dry, demold, and obtain the finished PVA chemical-resistant gloves.

[0024] This invention effectively enhances the softness of PVA gloves through a two-layer slurry covering system. The overall processing is convenient and efficient. By immersing the inner lining layer in a coagulant and drying it, and then applying the aforementioned water-based latex blend slurry to the surface, a water-based latex blend layer can be effectively formed during processing. The slurry solidifies more quickly under the action of the coagulant, reducing fluidity and effectively preventing slurry seepage. This also ensures uniform thickness of the molded glove, especially in the hand support area, resulting in good overall quality. Furthermore, by using PVA slurry to form an outer PVA layer, effective chemical resistance is achieved. The outer PVA layer of this invention is thinner than conventional multi-layer PVA systems, and its combined effect with the middle water-based latex blend layer further ensures the resulting glove maintains excellent softness.

[0025] In summary, compared with the prior art, the present invention has the following advantages:

[0026] 1. By employing a water-based latex blend layer between the inner lining and the PVA outer layer, the water-based latex blend layer can directly contact the PVA outer layer, essentially dispersing within the PVA matrix. Furthermore, the softer water-based latex molecular chains effectively reduce the probability of hydrogen bonding between PVA molecular chains, disrupting the film's regular structure and reducing crystallinity, thereby lowering the PVA's hardness and improving the glove's softness and thickness uniformity. The addition of a crosslinking agent allows it to react with PVA hydroxyl groups during glove manufacturing, bridging two or more PVA molecules to form a high-molecular-weight three-dimensional network structure, which more effectively improves the overall water resistance and solvent resistance.

[0027] 2. By including a certain amount of PVA in the water-based latex blend layer, it is equivalent to the layer containing hydroxyl structures. This allows the blend layer and the outer layer to form a large number of strong hydrogen bonds at the interface, thereby improving the interlayer adhesion and bonding strength. The blend layer can be firmly bonded to the outer layer of Ws through hydroxyl groups, resulting in stronger overall adhesion, reducing delamination under external forces, and achieving a strong overall strength.

[0028] 3. By using water-based latex as the main raw material for the intermediate layer, the PVA gloves can have the advantage of good overall softness. The selected water-based latex is blended with PVA, which can more effectively enable the intermediate layer to gel quickly under the action of the coagulant on the lining during the manufacturing process, reducing fluidity and allowing it to gel quickly on the surface of the lining. This reduces the phenomenon of slurry seepage and dripping, which is beneficial to the processing process and can more effectively improve the overall uniformity, resulting in a uniform thickness of the glove, especially the palm area.

[0029] 4. The two-layer structure system has the advantages of relatively simplified processing technology and simple operation. When combined with the above-mentioned water-based latex blended slurry for processing, it can produce gloves with better uniform thickness and high overall interlayer bonding strength. Detailed Implementation

[0030] The technical solution of the present invention will be further described in detail below through specific embodiments, but the present invention is not limited to these embodiments.

[0031] Example 1

[0032] This polyvinyl alcohol (PVA) chemical-resistant glove includes an inner lining layer and a PVA outer layer. More importantly, the PVA outer layer and the inner lining layer are bonded together by a water-based latex blend layer, which is made from raw materials comprising the following parts by weight:

[0033] PVA: 10-90; Water-based latex: 140-200; Glycerin: 8.0-15; Polyglycerol: 5.0-15; Superabsorbent polymer: 2.0-4.0; Defoamer: 0.5-1.5; Crosslinking agent: 0.5-2.0; Water: 300-400.

[0034] Ideally, the above-mentioned PVA outer layer should be made from raw materials comprising the following parts by weight:

[0035] PVA: 45-55; Glycerin: 5.0-10; Polyglycerol: 10-16; Superabsorbent polymer II: 2.0-4.0; Defoamer: 0.5-1.5; Crosslinking agent II: 0.5-2.0; Water: 400-500.

[0036] This is equivalent to a polyvinyl alcohol glove consisting of an inner lining, a water-based latex blend layer, and a PVA outer layer, from the inside out. The inner lining is the glove lining. It is best to soak the inner lining in a coagulant during the manufacturing process so that the inner lining is covered with the coagulant.

[0037] As a preferred embodiment, it is preferable that the water-based latex in the raw materials of the aforementioned water-based latex blend layer is selected from one or more of natural rubber, butyl rubber, nitrile rubber, and water-based PU. This provides the advantage of good softness and synergistic effect with the blend system to improve overall softness and chemical resistance. Furthermore, both the aforementioned superabsorbent polymer one and superabsorbent polymer two contain strongly absorbent groups, such as carboxyl groups or sulfonic acid groups. Preferably, superabsorbent polymer one and superabsorbent polymer two are each independently selected from one or more of acrylamide-acrylonitrile-acrylic acid terpolymer, starch acrylate polymer, starch-acrylonitrile graft copolymer, and polyacrylate.

[0038] The crosslinking agent 1 and crosslinking agent 2 mentioned above are each independently selected from blocked isocyanates, epoxy silane polymers, melamine, aziridine, etc., with aziridine being the preferred choice.

[0039] Defoamers can be made from any commonly used materials, but it is best to use one or a combination of several of the following: emulsified silicone oil, high carbon alcohol fatty acid ester complex, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene alcohol amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether, and polydimethylsiloxane.

[0040] In a further embodiment, it is preferable that the raw material of the aforementioned waterborne latex blend layer also contains 35 to 60 parts by weight of PVA. This ensures that the raw material of the intermediate waterborne latex layer is primarily a blend of PVA and waterborne latex, thereby better achieving overall softness and interlayer adhesive strength.

[0041] Of course, to further enhance the functionality of the gloves, 0.5–1.0 parts by weight of bactericide and 1.0–2.0 parts by weight of colorant can be added independently to the raw materials of the water-based latex blend layer and the PVA outer layer. This will result in better antibacterial properties and meet color requirements.

[0042] The performance of the polyvinyl alcohol chemical protective gloves was tested and analyzed. The results show that, within the scope of this invention, the obtained polyvinyl alcohol chemical protective gloves all have good performance and can at least meet the following performance indicators.

[0043] EN388 test results: abrasion resistance level 3, cutting resistance level 1, tear resistance level 3, puncture resistance level 1, straight blade cutting resistance level B;

[0044] The EN374 chemical resistance test results are as follows: acetone, ethyl acetate, acetonitrile, dichloromethane, tetrahydrofuran, and carbon disulfide are all at level 6, and toluene is at level 2; the flexibility test result is the highest level, level 5.

[0045] The above-mentioned polyvinyl alcohol chemical-resistant gloves can be manufactured using general glove processing techniques. However, it is best to use the following method:

[0046] The inner lining of the glove is placed on the glove mold. After heating the mold, the heating temperature is preferably 65℃~75℃. After impregnation with a coagulant, it is dried. Then, it is sprayed or immersed in a water-based latex blending slurry to form a water-based latex blending layer on the surface of the inner lining. It is then dried, preferably at a drying temperature of 65℃~75℃, to form a semi-finished glove with a water-based latex layer on the surface of the inner lining. The water-based latex blending slurry comprises the following raw materials in the following weight proportions:

[0047] PVA: 10-90; Water-based latex: 140-200; Glycerin: 8.0-15; Polyglycerol: 5.0-15; Superabsorbent polymer: 2.0-4.0; Defoamer: 0.5-1.5; Crosslinking agent: 0.5-2.0; Water: 300-400;

[0048] The PVA slurry is then sprayed or immersed to form an outer PVA layer on the surface of the water-based latex blend layer. The mixture is then dried, preferably at a temperature of 90℃~95℃, and demolded to obtain the finished PVA chemical-resistant gloves.

[0049] Example 2

[0050] This polyvinyl alcohol (PVA) chemical-resistant glove comprises an inner lining layer and a PVA outer layer, bonded together by an aqueous latex blend layer. The aqueous latex blend layer is made from raw materials comprising the following parts by weight:

[0051] PVA: 50; Water-based latex: 140; Glycerin: 15; Polyglycerol: 10; Superabsorbent polymer: 3.0; Defoamer: 1.0; Bactericide: 1.0; Color paste: 2.0; Crosslinking agent: 1.0; Water: 400; Wherein the water-based latex is nitrile rubber, superabsorbent polymer is acrylamide-acrylonitrile-acrylic acid terpolymer, and crosslinking agent is melamine.

[0052] The aforementioned PVA outer layer is made from raw materials comprising the following weight proportions:

[0053] PVA: 50; Glycerin: 10; Polyglycerol: 16; Superabsorbent polymer II: 3.0; Defoamer: 1.0; Bactericide: 1.0; Color paste: 2.0; Crosslinking agent II: 1.0; Water: 400. Among them, the superabsorbent polymer is an acrylamide-acrylonitrile-acrylic acid terpolymer, and the crosslinking agent is melamine.

[0054] The specific production method is as follows:

[0055] To dissolve PVA, add PVA particles and water to a mixing container, stir well, add a small amount of defoamer, heat to 60°C, keep warm for 30 minutes, then heat to 95°C and keep warm for 1 hour.

[0056] According to the weight ratio requirements of the raw material slurry for the water-based latex blend layer, other raw materials are added to the PVA raw material dissolved in the above manner, stirred evenly, and allowed to stand to degas before use, forming the following raw material slurry for the water-based latex blend layer:

[0057] 50 parts PVA, 140 parts water-based latex, 15 parts glycerin, 10 parts polyglycerol, 3 parts superabsorbent polymer, 1 part bactericide, 1 part defoamer, 2 parts color paste, 1 part crosslinking agent, and 400 parts water.

[0058] Using the same method, according to the required proportions of the PVA outer layer raw material slurry, other raw materials are added to the PVA raw material dissolved using the above method, stirred evenly, and allowed to stand to degas before use, forming the following PVA outer layer raw material slurry:

[0059] 50 parts PVA, 10 parts glycerin, 16 parts polyglycerol, 3 parts superabsorbent polymer (SAP), 1 part bactericide, 1 part defoamer, 2 parts color paste, 1 part crosslinking agent, and 400 parts water.

[0060] Place the glove liner on the glove mold, heat the mold to 70°C, immerse the whole mold in coagulant, rotate the mold around its axis for 3 minutes, immerse the water-based latex blend slurry to form a water-based latex blend layer, drip the slurry, tilt the mold upward and rotate it around its axis for 2 minutes, and dry it in an oven at 70°C for 40 minutes.

[0061] After the PVA outer layer is formed by immersing it in the raw material slurry, the slurry is dripped, and the mold is rotated horizontally around its axis for 2 minutes. It is then dried in an oven at 90°C for 1 hour and demolded to obtain the finished polyvinyl alcohol chemical-resistant gloves.

[0062] Example 3

[0063] This polyvinyl alcohol (PVA) chemical-resistant glove comprises an inner lining layer and a PVA outer layer, bonded together by an aqueous latex blend layer. The aqueous latex blend layer is made from raw materials comprising the following parts by weight:

[0064] PVA: 60; Water-based latex: 200; Glycerin: 8.0; Polyglycerol: 8.0; Superabsorbent polymer: 2.0; Defoamer: 1.5; Bactericide: 0.5; Color paste: 1.0; Crosslinking agent: 1.5; Water: 300; Wherein the water-based latex is made of natural rubber, the superabsorbent polymer is made of polyacrylate, and the crosslinking agent is made of melamine.

[0065] The aforementioned PVA outer layer is made from raw materials comprising the following weight proportions:

[0066] PVA: 55; Glycerin: 5.0; Polyglycerol: 12; Superabsorbent polymer II: 2.0; Defoamer: 1.5; Bactericide: 0.5; Color paste: 1.0; Crosslinking agent II: 1.5; Water: 450. Among them, the superabsorbent polymer is a starch acrylate polymer, and the crosslinking agent is a low-temperature deblocking isocyanate.

[0067] The specific manufacturing method of the chemical protective gloves in this embodiment is the same as that in Embodiment 2, and will not be repeated here.

[0068] Example 4

[0069] This polyvinyl alcohol (PVA) chemical-resistant glove comprises an inner lining layer and a PVA outer layer, bonded together by an aqueous latex blend layer. The aqueous latex blend layer is made from raw materials comprising the following parts by weight:

[0070] PVA: 45; Waterborne latex: 160; Glycerin: 10; Polyglycerol: 10; Superabsorbent polymer: 2.0; Defoamer: 1.0; Bactericide: 1.0; Color paste: 2.0; Crosslinking agent: 0.5; Water: 350; Wherein the waterborne latex is nitrile rubber, superabsorbent polymer is starch-acrylonitrile graft copolymer, and crosslinking agent is aziridine.

[0071] The aforementioned PVA outer layer is made from raw materials comprising the following weight proportions:

[0072] PVA: 45; Glycerin: 8.0; Polyglycerol: 12; Superabsorbent polymer II: 2.0; Defoamer: 1.0; Bactericide: 1.0; Color paste: 2.0; Crosslinking agent II: 0.5; Water: 500, wherein the superabsorbent polymer II is a starch-acrylonitrile graft copolymer, and the crosslinking agent II is aziridine.

[0073] The specific manufacturing method of the polyvinyl alcohol chemical protective gloves in this embodiment is the same as that in Embodiment 2, and will not be repeated here.

[0074] Example 5

[0075] This polyvinyl alcohol (PVA) chemical-resistant glove comprises an inner lining layer and a PVA outer layer, bonded together by an aqueous latex blend layer. The aqueous latex blend layer is made from raw materials comprising the following parts by weight:

[0076] PVA: 90; Water-based latex: 160; Glycerin: 8.0; Polyglycerol: 6.0; Superabsorbent polymer: 4.0; Defoamer: 1.5; Bactericide: 1.0; Color paste: 2.0; Crosslinking agent: 1.2; Water: 350; Wherein the water-based latex is water-based PU, the superabsorbent polymer is melamine, and the crosslinking agent is a low-temperature deblocking isocyanate.

[0077] The aforementioned PVA outer layer is made from raw materials comprising the following weight proportions:

[0078] PVA: 50; Glycerin: 7.0; Polyglycerol: 10; Superabsorbent polymer II: 3.5; Defoamer: 1.5; Bactericide: 0.5; Color paste: 2.0; Crosslinking agent II: 1.5; Water: 400. Among them, superabsorbent polymer II is melamine, and crosslinking agent II is low-temperature deblocking isocyanate.

[0079] The specific manufacturing method of the chemical protective gloves in this embodiment is the same as that in Embodiment 2, and will not be repeated here.

[0080] Example 6

[0081] This polyvinyl alcohol (PVA) chemical-resistant glove comprises an inner lining layer and a PVA outer layer, bonded together by an aqueous latex blend layer. The aqueous latex blend layer is made from raw materials comprising the following parts by weight:

[0082] PVA: 10; Water-based latex: 170; Glycerin: 12; Polyglycerol: 11; Superabsorbent polymer: 3.5; Defoamer: 0.8; Bactericide: 0.5; Color paste: 1.0; Crosslinking agent: 1.5; Water: 400; Wherein the water-based latex is made of nitrile rubber, superabsorbent polymer is made of starch acrylate polymer, and crosslinking agent is made of low-temperature deblocking isocyanate.

[0083] The aforementioned PVA outer layer is made from raw materials comprising the following weight proportions:

[0084] PVA: 50; Glycerin: 6.0; Polyglycerol: 11; Superabsorbent polymer II: 3.0; Defoamer: 1.5; Bactericide: 1.0; Color paste: 2.0; Crosslinking agent II: 1.5; Water: 400. Among them, superabsorbent polymer II is a starch acrylate polymer, and crosslinking agent II is a low-temperature deblocking isocyanate.

[0085] The specific manufacturing method of this embodiment is the same as that of Embodiment 2, and will not be repeated here.

[0086] The chemical protective gloves of Examples 2 to 6 were randomly selected and subjected to corresponding performance tests. The results showed that they all achieved the following performance effects, indicating that they have excellent performance.

[0087] EN388 test results: abrasion resistance level 3, cutting resistance level 1, tear resistance level 3, puncture resistance level 1, straight blade cutting resistance level B;

[0088] The EN374 chemical resistance test results are as follows: acetone, ethyl acetate, acetonitrile, dichloromethane, tetrahydrofuran, and carbon disulfide are all at level 6, and toluene is at level 2.

[0089] The flexibility test is rated as the highest level, Level 5.

[0090] Furthermore, the overall thickness of the polyvinyl alcohol chemical protective gloves is uniform.

[0091] The specific embodiments described in this invention are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains can make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0092] Although the present invention has been described in detail and specific embodiments have been cited, it will be apparent to those skilled in the art that various changes or modifications can be made without departing from the spirit and scope of the invention.

Claims

1. A polyvinyl alcohol (PVA) chemical-resistant glove, comprising an inner lining layer and a PVA outer layer, characterized in that, An aqueous latex blend layer is formed between the PVA outer layer and the inner liner layer, and the aqueous latex blend layer is made from raw materials comprising the following parts by weight: PVA: 10-90; Water-based latex: 140-200; Glycerin: 8.0–15; Polyglycerol: 5.0–15; Superabsorbent polymer (SAP): 2.0–4.0; Defoamer: 0.5-1.5; Crosslinking agent 1: 0.5-2.0; Water: 300-400; The aqueous latex blend layer is in direct contact with the PVA outer layer, effectively reducing the probability of hydrogen bonds forming between PVA molecular chains, disrupting the regular structure of the film, and reducing crystallinity.

2. The polyvinyl alcohol chemical-resistant gloves according to claim 1, characterized in that, The water-based latex blend layer contains 35-60 parts by weight of PVA.

3. The polyvinyl alcohol chemical-resistant gloves according to claim 1, characterized in that, The water-based latex is selected from one or more of natural rubber, butyl rubber, nitrile rubber, and water-based PU.

4. The polyvinyl alcohol chemical-resistant gloves according to claim 1, 2, or 3, characterized in that, The superabsorbent polymer is selected from one or more of acrylamide-acrylonitrile-acrylic acid terpolymer, starch acrylate polymer, starch-acrylonitrile graft copolymer and polyacrylate.

5. The polyvinyl alcohol chemical-resistant gloves according to claim 1, 2, or 3, characterized in that, The crosslinking agent is selected from one or more of epoxy silane polymers, blocked isocyanates, melamine, and aziridine.

6. The polyvinyl alcohol chemical-resistant gloves according to claim 1, 2, or 3, characterized in that, The PVA outer layer is made from raw materials comprising the following parts by weight: PVA: 45-55; Glycerin: 5.0-10; Polyglycerol: 10-16; Superabsorbent polymer II: 2.0-4.0; Defoamer: 0.5-1.5; Crosslinking agent II: 0.5-2.0; Water: 400-500.

7. The polyvinyl alcohol chemical-resistant gloves according to claim 6, characterized in that, The superabsorbent polymer in the raw material of the PVA outer layer is selected from one or more of acrylamide-acrylonitrile-acrylic acid terpolymer, starch acrylate polymer, starch-acrylonitrile graft copolymer and polyacrylate.

8. The polyvinyl alcohol chemical-resistant gloves according to claim 6, characterized in that, The crosslinking agent 2 in the raw material of the PVA outer layer is selected from one or more of epoxy silane polymers, blocked isocyanates, melamine and aziridine.

9. A method for manufacturing polyvinyl alcohol chemical-resistant gloves, characterized in that, The method includes the following steps: A. An inner lining layer is fitted onto a glove mold. After heating the mold, it is impregnated with a coagulant and dried. Then, it is sprayed or immersed in an aqueous latex blending slurry to form an aqueous latex layer. After drying, a semi-finished glove is formed with an aqueous latex layer on the surface of the inner lining layer. The aqueous latex blending slurry comprises the following raw materials in the indicated weight proportions: PVA: 10-90; Water-based latex: 140-200; Glycerin: 8.0-15; Polyglycerol: 5.0-15; Superabsorbent polymer: 2.0-4.0; Defoamer: 0.5-1.5; Crosslinking agent: 0.5-2.0; Water: 300-400; B. Spray or immerse in PVA slurry to form an outer PVA layer on the surface of the water-based latex layer, dry, demold, and obtain the finished PVA chemical-resistant gloves.