Latex glove coating agent, preparation method thereof and latex gloves

Abstract

The invention provides a latex glove coating agent, a preparation method thereof and latex gloves, and belongs to the technical field of coating agents. The latex glove coating agent provided by the invention comprises the following components in parts by mass: 30-50 parts of styrene-butadiene latex, the solid content of the styrene-butadiene latex is 45-50 wt%; 0.3 to 2 parts of a wetting agent; 3 to 15 parts of a slipping agent; 0.5 to 5 parts of matting powder; 0.1 to 0.5 part of a dispersant; 0.2 to 0.8 part of a defoaming agent; 0.5-5 parts of a rheological additive; 2 to 8 parts of a slipping-demoulding auxiliary agent; and 40-60 parts of water. The styrene-butadiene latex is used as a film-forming substance and has excellent water resistance and thermal aging resistance, meanwhile, the wetting agent, the slipping agent, the matting powder, the dispersing agent, the defoaming agent, the rheological agent and the slipping-demolding agent are used in a compounded mode, the obtained latex glove coating agent is used for preparing latex gloves, the excellent water resistance and thermal aging resistance can be kept, and the service life of the latex gloves is prolonged. The after-tack condition does not exist under the high-temperature condition.

Description

Technical Field

[0001] The invention relates to the technical field of finishing agents, in particular to a latex glove finishing agent and a preparation method thereof and latex gloves. Background Art

[0002] Latex gloves are widely used in the fields of medical treatment, hygiene, electronics, and chemical industry. In order to improve the wearing comfort and protective performance of latex gloves, the inner surface of the gloves is usually coated with corn starch, talcum powder, or polymer materials to form a coating, and powdered latex gloves and powder-free latex gloves are obtained accordingly. Powdered latex gloves have the risk of allergies and wound contamination, and are gradually being replaced by powder-free latex gloves.

[0003] At present, the polymer material inner coating used in powder-free latex gloves mainly uses polyurethane resin or acrylic resin as the film-forming substance, which has the problem of poor water resistance. In addition, the film-forming substance using acrylic resin has poor heat aging resistance and there is a risk of re-sticking under high temperature conditions. Summary of the invention

[0004] The purpose of the present invention is to provide a latex glove finishing agent and a preparation method thereof and latex gloves. The latex glove finishing agent provided by the present invention has excellent water resistance and heat aging resistance.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a latex glove finishing agent, comprising the following components in parts by weight:

[0007] 30-50 parts of styrene-butadiene latex, wherein the solid content of the styrene-butadiene latex is 45-50wt%; 0.3-2 parts of a wetting agent; 3-15 parts of a lubricant; 0.5-5 parts of a matting powder; 0.1-0.5 parts of a dispersant; 0.2-0.8 parts of a defoaming agent; 0.5-5 parts of a rheological additive; 2-8 parts of a lubricating-release agent; and 40-60 parts of water.

[0008] Preferably, the styrene butadiene latex includes unmodified styrene butadiene latex and / or carboxyl-modified styrene butadiene latex; the glass transition temperature of the carboxyl-modified styrene butadiene latex is 15 to 60° C., and the carboxyl-modified styrene butadiene latex includes LIGOSTM F 3800, DL294PA or HZ2380A.

[0009] Preferably, the wetting agent is a polyether-modified silicone wetting agent, and the polyether-modified silicone wetting agent includes BYK-333, YMT-328, YMT-245 or YMT-320.

[0010] Preferably, the lubricant includes one or more of a wax lubricant, a silicone lubricant and an amide lubricant; the wax lubricant includes one or more of MD-2011, PE-2045A and PEW-2013, the silicone lubricant includes one or more of DC-51, F-12 and G-7045; the amide lubricant includes erucamide and / or oleamide.

[0011] Preferably, the matting powder is silicon dioxide, and the particle size of the silicon dioxide is 2 to 10 μm.

[0012] Preferably, the dispersant is an aqueous dispersant, and the aqueous dispersant includes HY-201 or BYK-191.

[0013] Preferably, the defoaming agent includes a modified silicone defoaming agent, and the modified silicone defoaming agent includes TSA-630, B-107 or DF-855.

[0014] Preferably, the rheological additive comprises an alkali-swellable acrylic rheological additive or a cellulose rheological additive.

[0015] The present invention provides a method for preparing the latex glove finishing agent described in the above technical solution, comprising the following steps:

[0016] The components of the latex glove finishing agent are mixed to obtain the latex glove finishing agent.

[0017] The present invention provides a latex glove, comprising a latex glove substrate and a coating attached to the inner surface of the latex glove substrate, wherein the raw materials for preparing the coating comprise the latex glove finishing agent described in the above technical solution or the latex glove finishing agent prepared by the preparation method described in the above technical solution.

[0018] The invention provides a latex glove finishing agent, comprising the following components in parts by weight: 30-50 parts of styrene-butadiene latex, wherein the solid content of the styrene-butadiene latex is 45-55wt%; 0.3-2 parts of a wetting agent; 3-15 parts of a lubricant; 0.5-5 parts of a matting powder; 0.1-0.5 parts of a dispersant; 0.2-0.8 parts of a defoaming agent; 0.5-5 parts of a rheological aid; 2-8 parts of a lubricating-release aid; and 40-60 parts of water. In the invention, the latex glove finishing agent uses styrene-butadiene latex as a film-forming substance, which has excellent water resistance and heat aging resistance. The wetting agent, lubricant, matting powder, dispersant, defoaming agent, rheological aid and lubricating-release aid are compounded and used. The obtained latex glove finishing agent is used to prepare latex gloves, which can maintain excellent water resistance and heat aging resistance, and does not have a sticking phenomenon under high temperature conditions.

[0019] In addition, the cost of using polyurethane resin as a film-forming material is relatively high. The present invention uses styrene-butadiene latex as a film-forming material, and the resulting latex glove finishing agent has a relatively low cost and is suitable for industrialization. DETAILED DESCRIPTION

[0020] The present invention provides a latex glove finishing agent, comprising the following components in parts by weight:

[0021] 30-50 parts of styrene-butadiene latex, wherein the solid content of the styrene-butadiene latex is 45-50wt%; 0.3-2 parts of a wetting agent; 3-15 parts of a lubricant; 0.5-5 parts of a matting powder; 0.1-0.5 parts of a dispersant; 0.2-0.8 parts of a defoaming agent; 0.5-5 parts of a rheological additive; 2-8 parts of a lubricating-release agent; and 40-60 parts of water.

[0022] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known to those skilled in the art or are prepared by methods well known to those skilled in the art.

[0023] In terms of mass fraction, the latex glove finishing agent of the present invention includes 30 to 50 parts of styrene butadiene latex, specifically 30 parts, 33 parts, 35 parts, 37 parts, 40 parts, 42 parts, 45 parts, 47 parts or 50 parts. In the present invention, the solid content of the styrene butadiene latex is 45 to 55 wt%, and further can be 48 to 50 wt%. As an embodiment of the present invention, the styrene butadiene latex can include unmodified styrene butadiene latex and / or carboxyl-modified styrene butadiene latex, preferably carboxyl-modified styrene butadiene latex, and the use of carboxyl-modified styrene butadiene latex is more conducive to improving the adhesion of the coating; the glass transition temperature of the carboxyl-modified styrene butadiene latex can be 15 to 60°C; the carboxyl-modified styrene butadiene latex can include LIGOS TM F 3800, DL294PA or HZ2380A. In an embodiment of the present invention, the LIGOS TM F 3800 (solid content of 50wt%) is specifically from Trinseo SA; the DL294PA (solid content of 50wt%) is specifically from Foshan Jinjia New Materials Co., Ltd.; the HZ2380A (solid content of 48wt%) is specifically from Hebei Haoze Chemical Co., Ltd. In the embodiments of the present invention, the above-mentioned carboxyl-modified styrene-butadiene latex is used. After the carboxyl modification, the polarity of the styrene-butadiene latex is enhanced, the adhesion effect with the latex glove substrate is better, the mechanical properties are improved, the storage stability is better, and it is not easy to decompose and crosslink under high temperature conditions, and it can still maintain good performance and excellent thermal aging performance.

[0024] Based on the mass fraction of the styrene-butadiene latex, the latex glove finishing agent of the present invention includes 0.3 to 2 parts of a wetting agent, specifically 0.3 parts, 0.5 parts, 0.8 parts, 1 parts, 1.3 parts, 1.5 parts, 1.8 parts or 2 parts. As an embodiment of the present invention, the wetting agent can be a polyether-modified silicone wetting agent, and the polyether-modified silicone wetting agent can include BYK-333, YMT-328, YMT-245 or YMT-320. In the embodiment of the present invention, the BYK-333 is specifically from BYK, Germany; YMT-328, YMT-245 and YMT-320 are specifically from Umet (Beijing) Environmental Materials Technology Co., Ltd. The above-mentioned types of wetting agents are used in the embodiment of the present invention to effectively reduce the surface tension of the latex glove finishing agent, so that the latex glove finishing agent can be better wetted and spread on the glove substrate.

[0025] Based on the mass fraction of the styrene-butadiene latex, the latex glove finishing agent of the present invention includes 3 to 15 parts of a lubricant, specifically 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 12 parts or 15 parts. As an embodiment of the present invention, the lubricant may include one or more of a wax lubricant, a silicone lubricant and an amide lubricant; the wax lubricant may be an aqueous wax emulsion, specifically one or more of MD-2011, PE-2045A and PEW-2013, for example, MD-2011, PE-2045A or PEW-2013; the silicone lubricant includes one or more of DC-51, F-12 and G-7045, specifically DC-51, F-12 or G-7045; the amide lubricant includes erucamide and / or oleamide, specifically erucamide or oleamide. In the embodiment of the present invention, the MD-2011 is specifically from Keim-Additec of Germany; PE-2045A is specifically from Longkou Yijiu Environmental Protection Technology Co., Ltd.; PEW-2013 is specifically from Nanjing Tianshi New Materials Technology Co., Ltd.; DC-51 is specifically from Dow Chemical Company; F-12 is specifically from Guangzhou Huitu New Materials Co., Ltd.; G-7045 is specifically from Foshan Guiju Environmental Protection New Materials Co., Ltd. As an embodiment of the present invention, the lubricant can be specifically a wax lubricant and an organosilicon lubricant, and the mass ratio of the wax lubricant to the organosilicon lubricant can be 1:1-9, specifically 1:1, 1:1.5, 1:1.7, 1:1.8, 1:2, 1:5 or 1:9. In the embodiment of the present invention, a wax lubricant and a silicone lubricant are used in combination, which can combine the advantages of the two types of lubricants, so that the coating has better slip and anti-adhesion effects, avoiding the problem of insufficient hand feel when using a small amount of wax lubricant alone and affecting the adhesion of the coating when using a large amount. It also avoids the high cost of using a silicone lubricant alone, and the possibility of migration problems of small molecule silicone lubricants that cause the coating to become sticky.

[0026] Based on the mass fraction of the styrene-butadiene latex, the latex glove finishing agent of the present invention includes 0.5 to 5 parts of matting powder, specifically 0.5 parts, 0.8 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts. As an embodiment of the present invention, the matting powder can be silicon dioxide, and the particle size of the silicon dioxide can be 2 to 10 μm. In the embodiment of the present invention, the matting powder is specifically TSA230, which comes from Guangzhou Lingwei Technology Co., Ltd. In the embodiment of the present invention, silicon dioxide with the above particle size is used as the matting powder, which can form a microscopic rough structure on the surface of the coating and improve the touch of the latex gloves; at the same time, the uneven texture and other defects on the surface of the latex gloves are covered by diffuse reflection of light, so that the surface of the latex gloves looks smoother and more uniform; and the addition of matting powder will also prevent adhesion of the coating.

[0027] Based on the mass fraction of the styrene-butadiene latex, the latex glove finishing agent of the present invention includes 0.1 to 0.5 parts of a dispersant, specifically 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts or 0.5 parts. As an embodiment of the present invention, the dispersant may be an aqueous dispersant, and the aqueous dispersant may include HY-201 or BYK-191. In the embodiment of the present invention, the HY-201 is specifically from Beijing Maier Chemical Technology Co., Ltd.; the BYK-191 is specifically from BYK Chemical. The use of the above-mentioned types of dispersants in the embodiment of the present invention can make the matting powder better distributed in the latex glove finishing agent, prevent the matting powder from settling during dilution and use, and prevent the problem of uneven coating after settling.

[0028] Based on the mass fraction of the styrene-butadiene latex, the latex glove finishing agent of the present invention includes 0.2 to 0.8 parts of defoaming agent, which can be specifically 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts or 0.8 parts. As an embodiment of the present invention, the defoaming agent can include a modified silicone defoaming agent, and the modified silicone defoaming agent can include TSA-630, B-107 or DF-855. In the embodiment of the present invention, the TSA-630 is specifically from Jiangsu Tengda Auxiliary Co., Ltd.; the B-107 is specifically from Guangdong Zhongke Hongtai New Materials Co., Ltd.; and the DF-855 is specifically from Dongguan Defeng Defoaming Agent Co., Ltd. The above-mentioned types of defoaming agents used in the embodiment of the present invention can effectively eliminate the foam of the latex glove finishing agent during the production and application process, and prevent the foam from causing pinholes, fish eyes and other problems on the coating surface; and it has good compatibility with the components in the latex glove finishing agent and is not easy to cause shrinkage holes.

[0029] Based on the mass fraction of the styrene-butadiene latex, the latex glove finishing agent of the present invention includes 0.5 to 5 parts of rheological additives, specifically 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts. As an embodiment of the present invention, the rheological additive may include an alkali-swellable acrylic rheological additive or a cellulose rheological additive; the alkali-swellable acrylic rheological additive may be 585-75, and the cellulose rheological additive may be hydroxyethyl cellulose, specifically HBR250. In the embodiment of the present invention, the 585-75 is specifically from Shanghai Snow Chemical Technology Co., Ltd.; the HBR250 is specifically from Ashland Corporation of the United States. The above-mentioned types of rheological additives used in the embodiment of the present invention can increase the viscosity of the latex glove finishing agent and maintain its stability; during the dilution and use process, the diluent can have a certain viscosity, which is conducive to the coating of the coating on the latex glove substrate, so that the coating thickness meets the requirements.

[0030] Based on the mass fraction of the styrene-butadiene latex, the latex glove finishing agent of the present invention includes 40 to 60 parts of water, specifically 40 parts, 45 parts, 50 parts, 55 parts or 60 parts. As an embodiment of the present invention, the water can specifically be deionized water.

[0031] Based on the mass fraction of the styrene-butadiene latex, the latex glove finishing agent of the present invention includes 2 to 8 parts of a slip-release aid, specifically 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts or 8 parts. As one embodiment of the present invention, the slip-release aid includes the following components in mass fractions: 6 to 12 parts of a nonionic emulsifier (the nonionic emulsifier is a lipophilic emulsifier and a hydrophilic emulsifier, and the mass ratio of the lipophilic emulsifier to the hydrophilic emulsifier can be 1:1.2-2; the lipophilic emulsifier is one or more of fatty alcohol polyoxyethylene ether, sorbitan fatty acid ester and lipophilic octylphenol polyoxyethylene ether, and the hydrophilic emulsifier is nonylphenol polyoxyethylene ether, fatty acid polyoxyethylene ether, One or more of ethylene oxide (10) ester, polyoxyethylene sorbitan fatty acid ester and hydrophilic octylphenol polyoxyethylene ether); 1 to 3 parts of a slip agent (the slip agent is erucic acid amide and / or oleic acid amide); 0.3 to 0.8 parts of a release agent (the release agent is one or more of stearic acid SA1801, stearic acid SA1810, zinc stearate and stearic acid amide); 3 to 10 parts of a cosolvent (the cosolvent may include an alcohol cosolvent and / or an ether cosolvent); 75 to 89 parts of water. As an embodiment of the present invention, the slip-release aid is specifically prepared with reference to Chinese patent CN115926524A, which will not be repeated here. The above-mentioned slip-release aid is used in the embodiment of the present invention, which can improve the slipperiness of the coating surface, promote the smooth demoulding of latex gloves, and facilitate the wearing of latex gloves.

[0032] The present invention provides a method for preparing the latex glove finishing agent described in the above technical solution, comprising the following steps:

[0033] The components of the latex glove finishing agent are mixed to obtain the latex glove finishing agent.

[0034] As an embodiment of the present invention, the mixing specifically includes: adding a dispersant, a defoaming agent and a matting powder to water in sequence to obtain a first mixture; adding styrene-butadiene latex, a lubricant, a lubricating-release aid, a rheological aid and a wetting agent to the first mixture in sequence. As an embodiment of the present invention, the mixing is carried out under stirring conditions; wherein the stirring rate when preparing the first mixed material can be 300-500rpm, specifically 400rpm, and when preparing the first mixed material, stirring for 3min after each material is added during the feeding process, and then the next material is added, and stirring for 15min after the matting powder is added, to obtain the first mixed material; the stirring rate when preparing the second mixed material can be 400-600, specifically 500rpm, and when preparing the latex glove finishing agent from the first mixed material, stirring for 3min after each material is added during the feeding process, and then the next material is added, and after the wetting agent is added, the speed is increased to 1500-2000 (specifically 1800rpm) and stirred for 1-2.5h (specifically 2h) to obtain the latex glove finishing agent.

[0035] The present invention provides a latex glove, comprising a latex glove substrate and a coating attached to the inner surface of the latex glove substrate, wherein the raw materials for preparing the coating include the latex glove finishing agent described in the above technical solution or the latex glove finishing agent prepared by the preparation method described in the above technical solution. The latex glove described in the present invention is specifically a disposable latex glove.

[0036] As an embodiment of the present invention, the method for preparing the latex gloves may include the following steps:

[0037] The hand mold was sequentially acid-washed (temperature was room temperature, pH value was 2), alkali-washed (temperature was room temperature, pH value was 11) and hot water-washed (temperature was 65°C), dried (temperature was 80°C, time was 8 minutes), and then immersed in a coagulant (temperature was 70°C, time was 15 seconds), wherein the coagulant was composed of calcium nitrate tetrahydrate, RE-40D release agent and water (the mass ratio of calcium nitrate tetrahydrate, RE-40D release agent and water was 13:2.5:84.5), dried (temperature was 105°C, time was 120 seconds); after that The latex after aging is impregnated (solid content 35wt%; temperature is 30°C, time is 8s), and dried (temperature is 105°C, time is 60s); then leaching (water temperature is 60°C, time is 30s), drying (temperature is 105°C, time is 60s); then impregnating with a diluent of a finishing agent (prepared by the latex glove finishing agent and water according to a mass ratio of 1:10; temperature is 50-55°C, time is 6s), curling, vulcanization (temperature is 105°C, time is 25min), and demoulding to obtain the latex gloves.

[0038] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Example 1

[0040] 2.96 kg of deionized water was added to the batching tank, stirring was started and the stirring rate was set to 400 rpm, 0.005 kg of dispersant (BYK-191), 0.015 kg of defoaming agent (TSA-630) and 0.05 kg of matting powder (TSA230) were added in sequence, and each material was stirred for 3 minutes after adding, and then the next material was added. After the matting powder was added, it was stirred for 15 minutes to obtain a first mixed material;

[0041] 1.5 kg of styrene-butadiene latex (LIGOS TMF 3800), 0.2kg lubricant (0.1kg wax lubricant MD-2011 and 0.1kg silicone lubricant DC-51), 0.2kg lubricant-release aid (prepared according to Example 1 in patent CN115926524A), 0.04kg rheological aid (hydroxyethyl cellulose HBR250) and 0.03kg wetting agent (polyether modified silicone wetting agent YMT-328). During the feeding process, stir for 3min after adding each material, and then add the next material. After the wetting agent is added, increase the speed to 1800rpm and stir for 2h to obtain a latex glove finishing agent.

[0042] Example 2

[0043] 2.89 kg of deionized water was added to the batching tank, stirring was started and the stirring rate was set to 400 rpm, 0.005 kg of dispersant (HY201), 0.015 kg of defoaming agent (TSA-630) and 0.06 kg of matting powder (TSA230) were added in sequence, and each material was stirred for 3 minutes after adding, and then the next material was added. After the matting powder was added, it was stirred for 15 minutes to obtain the first mixed material;

[0044] 1.5 kg of styrene-butadiene latex (HZ2830A), 0.22 kg of lubricant (0.08 kg of wax lubricant PEW-2013 and 0.14 kg of silicone lubricant G7045), 0.2 kg of lubricant-release aid (prepared according to Example 2 in patent CN115926524A), 0.08 kg of rheological aid (Snow 585-75) and 0.03 kg of wetting agent (polyether-modified silicone wetting agent BYK-333) were added to the first mixture in sequence. After adding each material, the mixture was stirred for 3 minutes, and then the next material was added. After the wetting agent was added, the speed was increased to 1800 rpm and stirred for 2 hours to obtain a latex glove finishing agent.

[0045] Example 3

[0046] 2.72 kg of deionized water was added to the batching tank, stirring was started and the stirring rate was set to 400 rpm, 0.005 kg of dispersant (HY201), 0.015 kg of defoaming agent (TSA-630) and 0.06 kg of matting powder (TSA230) were added in sequence, and each material was stirred for 3 minutes after adding, and then the next material was added. After the matting powder was added, the mixture was stirred for 15 minutes to obtain the first mixed material;

[0047] 1.6 kg of styrene-butadiene latex (DL294PA), 0.23 kg of lubricant (0.08 kg of wax lubricant PEW-2013 and 0.15 kg of silicone lubricant F-12), 0.25 kg of lubricant-release aid (prepared according to Example 3 in patent CN115926524A), 0.08 kg of rheological aid (Snow 585-75) and 0.04 kg of wetting agent (polyether modified silicone wetting agent YMT-320) were added to the first mixture in sequence. After adding each material, the mixture was stirred for 3 minutes, and then the next material was added. After the wetting agent was added, the rotation speed was increased to 1800 rpm and stirred for 2 hours to obtain a latex glove finishing agent.

[0048] Comparative Example 1

[0049] Commercially available Stahl acrylic latex glove finishing agent.

[0050] Comparative Example 2

[0051] The method of Example 1 is used, except that the styrene-butadiene latex is replaced by an acrylic emulsion ( 5161, purchased from Wanhua Chemical Group Co., Ltd.).

[0052] Comparative Example 3

[0053] The method of Example 3 is used, except that the styrene-butadiene latex is replaced by an acrylic emulsion ( 5161, purchased from Wanhua Chemical Group Co., Ltd.).

[0054] Comparative Example 4

[0055] The method of Example 1 is used, except that the slip-release agent is omitted and the amount of the slip agent is increased accordingly, as follows:

[0056] 2.96 kg of deionized water was added to the batching tank, stirring was started and the stirring rate was set to 400 rpm, 0.005 kg of dispersant (BYK-191), 0.015 kg of defoaming agent (TSA-630) and 0.05 kg of matting powder (TSA230) were added in sequence, and each material was stirred for 3 minutes after adding, and then the next material was added. After the matting powder was added, it was stirred for 15 minutes to obtain a first mixed material;

[0057] 1.5 kg of styrene-butadiene latex (LIGOS TMF 3800), 0.4kg lubricant (0.2kg wax lubricant MD-2011 and 0.2kg silicone lubricant DC-51), 0.04kg rheological additive (hydroxyethyl cellulose HBR250) and 0.03kg wetting agent (polyether modified silicone wetting agent YMT-328). During the adding process, stir for 3 minutes after adding each material, and then add the next material. After the wetting agent is added, increase the speed to 1800rpm and stir for 2h to obtain a latex glove finishing agent.

[0058] Comparative Example 5

[0059] The method of Example 1 is used, except that the lubricant is omitted and the amount of the lubricant-release agent is increased accordingly, as follows:

[0060] 2.96 kg of deionized water was added to the batching tank, stirring was started and the stirring rate was set to 400 rpm, 0.005 kg of dispersant (BYK-191), 0.015 kg of defoaming agent (TSA-630) and 0.05 kg of matting powder (TSA230) were added in sequence, and each material was stirred for 3 minutes after adding, and then the next material was added. After the matting powder was added, it was stirred for 15 minutes to obtain a first mixed material;

[0061] 1.5 kg of styrene-butadiene latex (LIGOS TM F 3800), 0.4kg of slip-release agent (prepared according to Example 1 in patent CN115926524A), 0.04kg of rheological agent (hydroxyethyl cellulose HBR250) and 0.03kg of wetting agent (polyether modified silicone wetting agent YMT-328). During the adding process, each material is stirred for 3 minutes after adding, and then the next material is added. After the wetting agent is added, the speed is increased to 1800rpm and stirred for 2 hours to obtain a latex glove finishing agent.

[0062] Test Example 1

[0063] Take 1 kg of the finishing agent in each embodiment and comparative example, add 10 kg of deionized water, and stir at 300 rpm for 30 minutes to obtain a finishing agent dilution solution;

[0064] The hand model (i.e., the glove model) was sequentially subjected to acid washing with a pH value of 2 (temperature at room temperature), alkali washing with a pH value of 11 (temperature at room temperature) and hot water washing at 65°C, dried at 80°C for 8 minutes, and then immersed in a coagulant at 70°C for 15 seconds, wherein the coagulant was composed of 13wt% calcium nitrate tetrahydrate (Sanxi Chemical Co., Ltd.), 2.5wt% RE-40D release agent (Shandong Langli New Materials Co., Ltd.) and 84.5wt% deionized water, and dried at 105°C for 120 seconds; then immersed in the matured latex (solid content 35wt%) at 30°C for 8 seconds, and dried at 105°C for 60 seconds; then leached at a water temperature of 60°C for 30 seconds, and dried at 105°C for 60 seconds; then immersed in the dilution of the finishing agent at 50°C for 6 seconds, curled, vulcanized in an oven at 105°C for 25 minutes, and demolded to obtain a disposable latex glove.

[0065] The disposable latex gloves were subjected to performance tests, as follows:

[0066] 1. Smoothness test

[0067] The newly prepared disposable latex gloves were tested according to the film-to-film test method in 8.2 of GB / T 10006-2021 "Determination of friction coefficient of plastic films and sheets", and the instrument used was the FPT-F1 friction coefficient tester. The results are shown in Table 1, where the smaller the friction coefficient, the better the corresponding coating smoothness. As can be seen from Table 1, the disposable latex gloves prepared using the latex glove finishing agent of the present invention have excellent smoothness.

[0068] Table 1 Friction coefficient test results of disposable latex gloves

[0069]

[0070]

[0071] 2. Adhesion test

[0072] The newly prepared disposable latex gloves were subjected to accelerated aging at a temperature of 70±2°C and a pressure of 5±0.2kg, and the adhesion was observed after 24 hours. The results are shown in Table 2. As can be seen from Table 2, the disposable latex gloves prepared using the latex glove finishing agent of the present invention have excellent anti-adhesion properties.

[0073] Table 2 Adhesion test results of disposable latex gloves

[0074] Source of coating agent Experimental Results Example 1 Non-stick Example 2 Non-stick Example 3 Non-stick Comparative Example 1 Fingers and palms are partially adhered Comparative Example 2 Slight adhesion of fingers Comparative Example 3 Fingers and palms are partially adhered Comparative Example 4 Non-stick Comparative Example 5 Slight adhesion of fingers

[0075] 3. High temperature water resistance

[0076] The powder content test of medical gloves is an important step to ensure the quality and safety of gloves. If the powder content is too high, it may cause powder residue, which may lead to allergic reactions, tissue inflammation, etc., posing a potential threat to the health of patients and users. In order to ensure that the powder content of medical gloves meets the relevant standards and safety requirements, the gloves are usually washed in hot water, which requires the glove coating to have good high temperature water resistance.

[0077] In this experiment, the newly prepared disposable latex gloves were tested for high temperature water resistance, and the specific experimental conditions were as follows: the hot water temperature was 70°C or 80°C, the soaking time was 1h, and after soaking, a drum dryer was used to bake for 2h at 60°C, and it was observed whether the coating fell off during the soaking process, and whether there was adhesion between the glove coatings after soaking and drying; the results are shown in Table 3. As can be seen from Table 3, the latex glove finishing agent in the present invention uses styrene-butadiene latex as a film-forming substance, and the obtained coating has excellent high temperature water resistance and low cost, which is suitable for mass production and application of latex glove finishing agents.

[0078] Table 3 High temperature water resistance test results of disposable latex gloves

[0079]

[0080]

[0081] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A latex glove finishing agent comprising the following components in parts by weight: 30-50 parts of styrene-butadiene latex, wherein the solid content of the styrene-butadiene latex is 45-50wt%; 0.3-2 parts of a wetting agent; 3-15 parts of a lubricant; 0.5-5 parts of a matting powder; 0.1-0.5 parts of a dispersant; 0.2-0.8 parts of a defoaming agent; 0.5-5 parts of a rheological additive; 2-8 parts of a lubricating-release agent; and 40-60 parts of water.

2. The latex glove finishing agent according to claim 1, characterized in that: The styrene butadiene latex includes unmodified styrene butadiene latex and / or carboxyl-modified styrene butadiene latex; the glass transition temperature of the carboxyl-modified styrene butadiene latex is 15 to 60° C., and the carboxyl-modified styrene butadiene latex includes LIGOS TM F3800, DL294PA or HZ2380A.

3. The latex glove finishing agent according to claim 1 or 2, characterized in that: The wetting agent is a polyether-modified silicone wetting agent, and the polyether-modified silicone wetting agent includes BYK-333, YMT-328, YMT-245 or YMT-320.

4. The latex glove finishing agent according to claim 1 or 2, characterized in that: The lubricant includes one or more of a wax lubricant, a silicone lubricant and an amide lubricant; the wax lubricant includes one or more of MD-2011, PE-2045A and PEW-2013, the silicone lubricant includes one or more of DC-51, F-12 and G-7045; the amide lubricant includes erucamide and / or oleamide.

5. The latex glove finishing agent according to claim 1 or 2, characterized in that: The matting powder is silicon dioxide, and the particle size of the silicon dioxide is 2 to 10 μm.

6. The latex glove finishing agent according to claim 1 or 2, characterized in that: The dispersant is an aqueous dispersant, and the aqueous dispersant includes HY-201 or BYK-191.

7. The latex glove finishing agent according to claim 1 or 2, characterized in that: The defoaming agent includes a modified silicone defoaming agent, and the modified silicone defoaming agent includes TSA-630, B-107 or DF-855.

8. The latex glove finishing agent according to claim 1 or 2, characterized in that: The rheological additive includes an alkali-swellable acrylic rheological additive or a cellulose rheological additive.

9. A method for preparing the latex glove finishing agent according to any one of claims 1 to 8, comprising the following steps: The components of the latex glove finishing agent are mixed to obtain the latex glove finishing agent.

10. A latex glove comprising a latex glove substrate and a coating attached to the inner surface of the latex glove substrate, wherein the raw material for preparing the coating comprises the latex glove finishing agent according to any one of claims 1 to 8 or the latex glove finishing agent prepared by the preparation method according to claim 9.

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