Nitrile rubber gloves and preparation method thereof

Abstract

The invention provides a nitrile rubber glove and a preparation method thereof, and belongs to the technical field of gloves. The invention provides a nitrile rubber glove base material. Carrying out first dipping treatment on the nitrile rubber glove base material in a diluent of a coating agent to obtain a composite glove base material; and vulcanizing the composite glove base material to obtain the nitrile rubber glove, the coating agent is prepared from the following components in parts by mass: 30 to 50 parts of styrene-butadiene latex, 0.5 to 2 parts of a wetting agent, 3 to 15 parts of a slipping agent, 0.2 to 0.8 part of a defoaming agent, 0.5 to 5 parts of a rheological agent, 3 to 10 parts of a slipping-demolding agent and 40 to 60 parts of water. The nitrile rubber gloves prepared by the method disclosed by the invention do not need a chlorine washing process, and have excellent smoothness, adhesion resistance and aging resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of gloves, and in particular to a nitrile rubber glove and a preparation method thereof. Background Art

[0002] Gloves are a common protective product, widely used in many fields such as medical treatment, daily life, food and catering processing, industrial production, etc. The performance of gloves directly affects the safety and effectiveness of personnel operations. Among them, the smoothness, anti-adhesion and aging resistance of gloves are important indicators for evaluating the performance of gloves. The traditional post-processing method of nitrile gloves includes chlorine washing process, which can reduce the adhesion of the substrate and remove impurities and additives remaining on the surface of the material to improve the performance of the gloves. However, the chlorine washing process is highly polluting and harmful to the human body. Summary of the invention

[0003] The object of the present invention is to provide a nitrile rubber glove and a preparation method thereof. The nitrile rubber glove is prepared by the method of the present invention without the need for a chlorine washing process, and the nitrile rubber glove has excellent smoothness, anti-adhesion and aging resistance.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] The present invention provides a method for preparing nitrile rubber gloves, which does not use a chlorine washing process and comprises the following steps:

[0006] Provide nitrile rubber gloves base material;

[0007] The nitrile rubber glove substrate is subjected to a first immersion treatment in a diluent of a finishing agent to obtain a composite glove substrate;

[0008] vulcanizing the composite glove substrate to obtain the nitrile rubber gloves;

[0009] The finishing agent comprises the following components in parts by mass: 30-50 parts of styrene-butadiene latex, 0.5-2 parts of wetting agent, 3-15 parts of lubricant, 0.2-0.8 parts of defoamer, 0.5-5 parts of rheological additive, 3-10 parts of lubricant-release agent and 40-60 parts of water.

[0010] Preferably, the diluent of the finishing agent comprises a finishing agent and a diluent, and the mass ratio of the finishing agent to the diluent is 1:8-12.

[0011] 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 50° C., and the carboxyl-modified styrene butadiene latex includes LIGOSTM F 3800, LJ1322 or LJ1225.

[0012] Preferably, the conditions of the first immersion treatment include: the temperature of the diluted solution of the finishing agent is 50-55° C., and the immersion time is 5-10 seconds.

[0013] Preferably, the vulcanization temperature is 105-120° C. and the time is 20-30 min.

[0014] Preferably, before the first dipping treatment, the method further comprises: curling the nitrile rubber glove substrate.

[0015] Preferably, the method for preparing the nitrile rubber glove substrate comprises the following steps:

[0016] The hand mold is subjected to a second dipping treatment in nitrile latex, and an initial glove substrate is obtained after drying;

[0017] The initial glove substrate is leached and dried to obtain the nitrile rubber glove substrate.

[0018] Preferably, the second dipping treatment comprises sequentially performing a first stage dipping and a second stage dipping, wherein the conditions of the first stage dipping and the second stage dipping independently include: the temperature of the nitrile latex is 20 to 40° C., and the dipping time is 4 to 8 seconds;

[0019] Preferably, the leaching conditions include: water temperature of 60-65° C., and leaching time of 25-40 seconds.

[0020] Preferably, before the second immersion treatment, the method further comprises: washing the hand model and then performing a third immersion treatment in a coagulant.

[0021] The present invention provides a nitrile rubber glove prepared by the preparation method described in the above technical solution, comprising a nitrile rubber glove substrate and a coating attached to the inner surface of the nitrile rubber glove substrate, wherein the coating is formed by the finishing agent.

[0022] The invention provides a method for preparing nitrile rubber gloves, which does not adopt a chlorine washing process and comprises the following steps: providing a nitrile rubber glove substrate; subjecting the nitrile rubber glove substrate to a first immersion treatment in a diluent of a finishing agent to obtain a composite glove substrate; and vulcanizing the composite glove substrate to obtain the nitrile rubber gloves; the finishing agent comprises the following components in parts by mass: 30 to 50 parts of styrene-butadiene latex, 0.5 to 2 parts of a wetting agent, 3 to 15 parts of a lubricant, 0.2 to 0.8 parts of a defoaming agent, 0.5 to 5 parts of a rheological additive, 3 to 10 parts of a lubricating-release additive, and 40 to 60 parts of water. The present invention adopts a finishing agent to form a coating on the surface of a nitrile rubber glove. The finishing agent adopts styrene-butadiene latex as a film-forming substance, has excellent water resistance and good heat aging resistance. A wetting agent, a lubricant, a defoaming agent, a rheological aid and a lubricating-release aid are compounded and used. The obtained finishing agent is used to prepare the nitrile rubber glove without the need for a chlorine washing process, that is, the nitrile rubber glove can maintain excellent lubricity, anti-adhesion property and aging resistance.

[0023] In addition, the present invention uses styrene-butadiene latex as a film-forming substance, and the obtained coating agent has a low cost and is suitable for industrialization. DETAILED DESCRIPTION

[0024] The present invention provides a method for preparing nitrile rubber gloves, which does not use a chlorine washing process and comprises the following steps:

[0025] Provide nitrile rubber gloves base material;

[0026] The nitrile rubber glove substrate is subjected to a first immersion treatment in a diluent of a finishing agent to obtain a composite glove substrate;

[0027] vulcanizing the composite glove substrate to obtain the nitrile rubber gloves;

[0028] The finishing agent comprises the following components in parts by mass: 30-50 parts of styrene-butadiene latex, 0.5-2 parts of wetting agent, 3-15 parts of lubricant, 0.2-0.8 parts of defoamer, 0.5-5 parts of rheological additive, 3-10 parts of lubricant-release agent and 40-60 parts of water.

[0029] 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.

[0030] In some prior art, the inner coating of gloves mainly uses polyurethane resin or acrylic resin as film-forming material, which has the problem of poor water resistance, and the film-forming material using acrylic resin has poor heat aging resistance, and there is a risk of re-adhesion under high temperature conditions, and polyurethane resin also has the problem of high cost. The present invention uses styrene-butadiene latex as a film-forming material, and the resulting coating agent has low cost and is suitable for industrialization; the coating agent is used to prepare nitrile rubber gloves, and no chlorine washing process is required, that is, the nitrile rubber gloves can maintain excellent smoothness, anti-adhesion and aging resistance. The coating agent of the present invention is first described in detail below.

[0031] In terms of mass fraction, the coating 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; the solid content of the styrene butadiene latex can be 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 50° C. The carboxyl-modified styrene butadiene latex can include LIGOS TM F 3800, LJ1322 or LJ1225. In an embodiment of the present invention, the LIGOS TM F3800 (solid content of 50wt%) is specifically from Trinseo SA; the LJ1322 (solid content of 48wt%) and LJ1225 (solid content of 48wt%) are specifically from Hangzhou Longju Synthetic Materials Co., Ltd. In the embodiment of the present invention, the carboxyl-modified styrene-butadiene latex of the above type is used, which can form good adhesion with the nitrile rubber glove substrate, and the coatings are not easy to stick together.

[0032] Based on the mass fraction of the styrene-butadiene latex, the finishing agent of the present invention includes 0.5 to 2 parts of a wetting agent, specifically 0.5 parts, 0.8 parts, 1 parts, 1.2 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 TEGO4100, YMT-328, YMT-245 or YMT-320. In an embodiment of the present invention, the TEGO4100 is specifically from Evonik Digo Chemical Co., Ltd., and YMT-328, YMT-245 and YMT-320 are specifically from Youmei Special (Beijing) Environmental Materials Technology Co., Ltd. The above-mentioned types of wetting agents are used in the embodiments of the present invention, which have a good wetting effect and can make the coating better wet and spread on the nitrile rubber glove substrate.

[0033] Based on the mass fraction of the styrene-butadiene latex, the coating 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 a wax lubricant and / or an organosilicon lubricant, specifically a wax lubricant and an organosilicon lubricant; the wax lubricant may be an aqueous wax emulsion, specifically D-806 and / or PEW-2011, for example, D-806 or PEW-2011; the organosilicon lubricant includes one or more of DC-51, FE212 and T-52, specifically DC-51, FE212 or T-52. In the embodiment of the present invention, the D-806 is specifically from Wengkaier Co., Ltd.; PEW-2011 is specifically from Nanjing Tianshi New Materials Technology Co., Ltd.; DC-51 is specifically from Dow Chemical Company; FE212 is specifically from Yongqi Materials Technology (Shanghai) Co., Ltd.; T-52 is specifically from Wengkaier Co., Ltd. As an embodiment of the present invention, when the lubricant is a wax lubricant and an organosilicon lubricant, the mass ratio of the wax lubricant to the organosilicon lubricant can be 1:1-10, specifically 1:1, 1:1.3, 1:1.5, 1:1.7, 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.

[0034] Based on the mass fraction of the styrene-butadiene latex, the 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 may include a modified silicone defoaming agent, and the modified silicone defoaming agent may include TSA-630 or Foamex 822. In the embodiment of the present invention, the TSA-630 is specifically from Jiangsu Tengda Additive Co., Ltd.; the Foamex 822 is specifically from Evonik Digo Chemical Co., Ltd. The above-mentioned types of defoaming agents used in the embodiment of the present invention can have good compatibility with the various components in the finishing agent, and are not prone to shrinkage problems while having good defoaming.

[0035] Based on the mass fraction of the styrene-butadiene latex, the coating agent of the present invention includes 0.5 to 5 parts of rheological additives, which can be specifically 0.5 parts, 1 parts, 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 can include an alkali-swellable acrylic rheological additive or a cellulose rheological additive; the alkali-swellable acrylic rheological additive can be specifically DR50 or SN580, and the cellulose rheological additive can be specifically hydroxyethyl cellulose, which can be specifically HBR250. In the embodiment of the present invention, the DR50 is specifically from Dow Chemical Company; the SN580 is specifically from Shanghai Sinuo Chemical Technology Co., Ltd.; and the HBR250 is specifically from Ashland Corporation of the United States. The above-mentioned types of rheological additives are used in the embodiment of the present invention to quickly increase the viscosity of the coating agent, and the diluent can still maintain the corresponding viscosity during the dilution process, so that the coating reaches the required thickness on the nitrile rubber glove substrate.

[0036] Based on the mass fraction of the styrene-butadiene latex, the coating 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.

[0037] Based on the mass fraction of the styrene-butadiene latex, the coating agent of the present invention has 3 to 10 parts of slip-release aid, which can be specifically 3, 4, 5, 6, 7, 8, 9 or 10 parts. As one embodiment of the present invention, the slip-release aid includes the following components in mass fractions: 6 to 12 parts of non-ionic emulsifier (the non-ionic 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 to 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 solvent (the solvent may include an alcohol solvent and / or an ether solvent); 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 slip-release aid of the above type is used in the embodiment of the present invention, which can increase the slipperiness of the coating, is beneficial to the demoulding of nitrile rubber gloves, and is beneficial to the wearing of nitrile rubber gloves.

[0038] As an embodiment of the present invention, the preparation method of the finishing agent may include the following steps: mixing the components of the finishing agent to obtain the finishing agent. As an embodiment of the present invention, the mixing specifically includes: adding a defoamer, styrene-butadiene latex, a slip agent, a slip-release agent, a rheological agent and a wetting agent to water in sequence; as an embodiment of the present invention, the mixing is carried out under stirring conditions; the stirring rate may be 300 to 800 rpm, specifically 500 rpm, and during the feeding process, each material is stirred for 3 minutes after being added, and then the next material is added. After the wetting agent is added, the speed is increased to 1500 to 2000 rpm (specifically 1800 rpm) and stirred for 1 to 2 hours (specifically 1.5 hours) to obtain the finishing agent.

[0039] The preparation method of the nitrile rubber gloves of the present invention is described in detail below.

[0040] The present invention provides a nitrile rubber glove substrate. As one embodiment of the present invention, the preparation method of the nitrile rubber glove substrate comprises the following steps:

[0041] The hand mold is subjected to a second dipping treatment in nitrile latex, and an initial glove substrate is obtained after drying;

[0042] The initial glove substrate is leached and dried to obtain the nitrile rubber glove substrate.

[0043] The present invention performs a second dipping treatment on the hand model in nitrile latex, and obtains the initial glove substrate after drying. As an embodiment of the present invention, the second dipping treatment preferably also includes: washing the hand model (i.e., the glove model) and then performing a third dipping treatment in a coagulant. As an embodiment of the present invention, the cleaning includes acid washing, alkali washing and water washing in sequence; the pH value of the acid reagent used for the acid washing can be 1.8 to 2, and the acid washing can be carried out at room temperature; the pH value of the alkali reagent used for the alkali washing can be 10.8 to 11, and the alkali washing can be carried out at room temperature; the water washing temperature can be 55 to 60°C. As an embodiment of the present invention, the cleaning also includes drying, and the drying temperature can be 75 to 80°C, and the time can be 4 to 6 minutes. As an embodiment of the present invention, the coagulant includes calcium nitrate tetrahydrate, RE-40D release agent (from Shandong Langli New Materials Co., Ltd.), Huntsman TERIC320 wetting agent and water, and the mass ratio of calcium nitrate tetrahydrate, RE-40D release agent, Huntsman TERIC320 wetting agent and water can be 10:1.5~2.5:0.15~0.25:80~90, specifically 10:1.9:0.2:87.9. As an embodiment of the present invention, the conditions of the third immersion treatment may include: the temperature may be 60~65°C, and the time may be 13~15s. As an embodiment of the present invention, the third immersion treatment also includes drying, and the drying temperature may be 105~110°C, and the time may be 110~120s.

[0044] As an embodiment of the present invention, after completing the third dipping treatment and drying, the obtained hand model is subjected to a second dipping treatment in nitrile latex. As an embodiment of the present invention, the nitrile latex can be a carboxyl nitrile latex, and in the embodiment of the present invention, the carboxyl nitrile latex after ripening is specifically used. The present invention is not particularly limited to the carboxyl nitrile latex after ripening, and the carboxyl nitrile latex after ripening well known to those skilled in the art is used; in the embodiment of the present invention, the solid content of the carboxyl nitrile latex after ripening is specifically 15wt%. In the present invention, nitrile rubber gloves are prepared by coagulation vulcanization surface treatment of carboxyl nitrile latex, and the chemical formula of carboxyl nitrile latex is as follows:

[0045] ~-(CH2-CH=CH-CH2) m -(CH2-CH(CN)) n -(CH2-CR(COOH)) p -~

[0046] Wherein, m, n, and p represent the average degree of polymerization of butadiene, acrylonitrile, and unsaturated carboxylic acid units in the polymer molecular chain, respectively, and R represents other groups in the unsaturated carboxylic acid except the carboxyl group, such as a hydrogen atom, a methyl group, and the like.

[0047] The general chemical formula of carboxyl-modified styrene-butadiene latex is as follows:

[0048] ~-(CH2-CH=CH-CH2) x -(CH2-CH(C6H5)) y -(CH2-CR(COOH)) z -~

[0049] Wherein, x, y, and z represent the average degree of polymerization of butadiene, styrene, and unsaturated carboxylic acid units in the polymer molecular chain, respectively, and R represents the remaining groups in the unsaturated carboxylic acid except the carboxyl group, such as a hydrogen atom.

[0050] It can be seen that carboxyl-modified styrene butadiene latex and carboxyl nitrile latex have similar polarity, and the coating formed by styrene butadiene latex as a film-forming substance has better adhesion to the nitrile rubber glove matrix; and the carboxyl group in styrene butadiene latex will also participate in the vulcanization and cross-linking reaction of nitrile rubber gloves to form an anchoring effect, and then firmly adhere to the surface of the gloves and are not easy to fall off. This can ensure that the performance of the coating can be fully exerted, and the protective effect of the gloves will not be affected by the shedding of the coating during use. At the same time, the good bonding strength also allows the coating to maintain good integrity after the gloves are used.

[0051] As an embodiment of the present invention, the second dipping treatment includes sequentially performing stage I dipping and stage II dipping, and the conditions of the stage I dipping and stage II dipping independently include: the temperature of the nitrile latex can be 25-40°C, specifically 30°C; the dipping time can be 4-8s, specifically 5s. As an embodiment of the present invention, drying is preferably performed after the stage I dipping and before the stage II dipping, and the drying temperature can be 105-110°C and the time can be 50-60s. As an embodiment of the present invention, after completing the second dipping treatment (specifically after completing the stage II dipping), drying is performed to obtain the glove substrate; the drying temperature can be 105-110°C and the time can be 50-60s.

[0052] After obtaining the initial glove substrate, the present invention leaches the initial glove substrate and obtains the nitrile rubber glove substrate after drying. As an embodiment of the present invention, the leaching conditions include: the water temperature can be 60-65°C, specifically 60°C; the leaching time can be 25-40s, specifically 30s. As an embodiment of the present invention, the drying temperature can be 105-110°C, and the drying time can be 50-60s.

[0053] After obtaining the nitrile rubber glove substrate, the present invention performs a first immersion treatment on the nitrile rubber glove substrate in a diluent of a finishing agent to obtain a composite glove substrate. As an embodiment of the present invention, the first immersion treatment also includes: curling the nitrile rubber glove substrate; the present invention has no special limitation on the curling, and a method well known to those skilled in the art can be used. As an embodiment of the present invention, the diluent of the finishing agent includes a finishing agent and a diluent, and the mass ratio of the finishing agent to the diluent can be 1:8-12, specifically 1:10; the diluent can be water, specifically deionized water. As an embodiment of the present invention, the conditions of the first immersion treatment include: the temperature of the diluent of the finishing agent is 50-55°C; the immersion time can be 5-10s, specifically 6s. The use of the finishing agent of the present invention to prepare nitrile rubber gloves can eliminate a large amount of wastewater generated by the chlorine washing process from a process point of view, greatly reduce environmental pollution, shorten the production process, and achieve good environmental protection and energy saving effects; at the same time, the coating formed by using styrene-butadiene latex as a film-forming substance has better adhesion.

[0054] After obtaining the composite glove substrate, the present invention vulcanizes the composite glove substrate to obtain the nitrile rubber gloves. As an embodiment of the present invention, the vulcanization temperature can be 105-120°C, specifically 110°C; the time can be 20-30 minutes, specifically 25 minutes. As an embodiment of the present invention, demolding is also included after vulcanization to obtain the nitrile rubber gloves.

[0055] The present invention provides a nitrile rubber glove prepared by the preparation method described in the above technical solution, comprising a nitrile rubber glove substrate and a coating attached to the inner surface of the nitrile rubber glove substrate, wherein the coating is formed by the finishing agent described in the above technical solution. As an embodiment of the present invention, the nitrile rubber glove is specifically a disposable nitrile rubber glove.

[0056] 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.

[0057] Example 1

[0058] 2.495 kg of deionized water was added to a batching tank, stirring was started and the stirring rate was set to 500 rpm, and 0.015 kg of defoamer (FOAMEX 822), 2 kg of styrene-butadiene latex (LJ1322), 0.2 kg of lubricant (0.1 kg of wax lubricant D-806 and 0.1 kg of silicone lubricant DC-51), 0.18 kg of lubricant-release aid (prepared according to Example 1 in patent CN115926524A), 0.08 kg of rheological aid (DR50) and 0.03 kg of wetting agent (YMT-328) were added in sequence. During the feeding process, each material was stirred for 3 minutes after being added, and then the next material was added. After all the materials were added, the speed was increased to 1800 rpm and stirred for 2 hours to obtain a glove finishing agent.

[0059] Example 2

[0060] 2.72 kg of deionized water was added to a batching tank, stirring was started and the stirring rate was set to 500 rpm, and 0.01 kg of defoamer (FOAMEX 822), 1.75 kg of styrene-butadiene latex (LJ12525), 0.2 kg of lubricant (0.08 kg of wax lubricant D-806 and 0.12 kg of silicone lubricant T-52), 0.2 kg of lubricant-release aid (prepared according to Example 2 in patent CN115926524A), 0.09 kg of rheological aid (SN580) and 0.03 kg of wetting agent (TEGO4100) were added in sequence. After each material was added during the feeding process, stirring was performed for 3 minutes, and then the next material was added. After all the materials were added, the speed was increased to 1800 rpm and stirred for 2 hours to obtain a glove finishing agent.

[0061] Example 3

[0062] 2.70 kg of deionized water was added to the batching tank, stirring was started and the stirring rate was set to 500 rpm, and 0.01 kg of defoamer (TSA630), 1.75 kg of styrene-butadiene latex (LIGOS TM F 3800), 0.2kg lubricant (0.08kg wax lubricant PEW-2011 and 0.12kg silicone lubricant FE-212), 0.22kg lubricant-release agent (prepared according to Example 2 in patent CN115926524A), 0.08kg rheological additive (SN580) and 0.04kg wetting agent (YMT-320). During the adding process, each material is stirred for 3 minutes after being added, and then the next material is added. After all the materials are added, the speed is increased to 1800rpm and stirred for 2 hours to obtain a glove finishing agent.

[0063] Comparative Example 1

[0064] Chlorine wash solution with 400 ppm chlorine.

[0065] Comparative Example 2

[0066] 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.).

[0067] Comparative Example 3

[0068] The method of Example 2 is used, except that the styrene-butadiene latex is replaced by an acrylic emulsion ( 5161, purchased from Wanhua Chemical Group Co., Ltd.).

[0069] Comparative Example 4

[0070] 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:

[0071] 2.495 kg of deionized water was added to the batching tank, stirring was started and the stirring rate was set to 500 rpm, and 0.015 kg of defoamer (FOAMEX 822), 2 kg of styrene-butadiene latex (LJ1322), 0.38 kg of lubricant (0.19 kg of wax lubricant D-806 and 0.19 kg of silicone lubricant DC-51), 0.08 kg of rheological additive (DR50) and 0.03 kg of wetting agent (YMT-328) were added in sequence. During the addition process, each material was stirred for 3 minutes after being added, and then the next material was added. After all the materials were added, the speed was increased to 1800 rpm and stirred for 2 hours to obtain a glove finishing agent.

[0072] Comparative Example 5

[0073] 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:

[0074] 2.495 kg of deionized water was added to a batching tank, stirring was started and the stirring rate was set to 500 rpm, and 0.015 kg of defoamer (FOAMEX 822), 2 kg of styrene-butadiene latex (LJ1322), 0.38 kg of slip-release aid (prepared according to Example 1 in patent CN115926524A), 0.08 kg of rheological aid (DR50) and 0.03 kg of wetting agent (YMT-328) were added in sequence. During the adding process, each material was stirred for 3 minutes after being added, and then the next material was added. After all the materials were added, the speed was increased to 1800 rpm and stirred for 2 hours to obtain a glove finishing agent.

[0075] Application Examples 1 to 3

[0076] The glove finishing agents in Examples 1 to 3 are respectively used to prepare nitrile gloves, and the steps are as follows:

[0077] a) Cleaning: The hand mold is sequentially subjected to acid washing with a pH value of 2 (temperature is room temperature), alkaline washing with a pH value of 11 (temperature is room temperature), and hot water washing at 60°C, and drying at 80°C for 6 minutes;

[0078] b) Immersing in a coagulant: The cleaned hand model is immersed in a coagulant at 65° C. for 15 seconds. The coagulant is composed of 10wt% calcium nitrate tetrahydrate (Sanxi Chemical Co., Ltd.), 1.9wt% RE-40D mold release agent (Shandong Langli New Materials Co., Ltd.), 0.2wt% Huntsman TERIC320 wetting agent and 87.9wt% deionized water, and then dried at 110° C. for 120 seconds;

[0079] c) Dipping in nitrile latex: dipping the hand model (temperature of 60° C.) after dipping in the coagulant into the matured carboxylated nitrile latex (temperature of 30° C., solid content of 15 wt%) for 5 seconds, wherein the solid content of the nitrile latex is 15 wt%, and then drying at 110° C. for 60 seconds; repeating the above-mentioned dipping in nitrile latex and drying operation once, i.e., performing the dipping in nitrile latex and drying operation twice in total, to obtain an initial glove substrate;

[0080] d) leaching: leaching the initial glove substrate at a water temperature of 60° C. for 30 seconds, and then drying at 110° C. for 60 seconds to obtain a nitrile rubber glove substrate;

[0081] e) Curling and dipping in a finishing agent: curling the nitrile rubber glove substrate, and then dipping in a finishing agent dilution at 50° C. for 6 seconds to obtain a composite glove substrate; the finishing agent dilution is obtained by mixing the glove finishing agent and deionized water at a mass ratio of 1:10 at 300 rpm for 30 minutes;

[0082] f) Vulcanization: The composite glove substrate is vulcanized in an oven at 110° C. for 25 min, and demoulded to obtain a disposable nitrile rubber glove.

[0083] Comparative application example 1

[0084] The chlorine lotion in Comparative Example 1 was used to prepare nitrile gloves, and the steps were as follows:

[0085] a) Cleaning: The hand mold is sequentially subjected to acid washing with a pH value of 2 (temperature is room temperature), alkaline washing with a pH value of 11 (temperature is room temperature), and hot water washing at 60°C, and drying at 80°C for 6 minutes;

[0086] b) Immersing in a coagulant: The cleaned hand model is immersed in a coagulant at 65° C. for 15 seconds. The coagulant is composed of 10wt% calcium nitrate tetrahydrate (Sanxi Chemical Co., Ltd.), 1.9wt% RE-40D mold release agent (Shandong Langli New Materials Co., Ltd.), 0.2wt% Huntsman TERIC320 wetting agent and 87.9wt% deionized water, and then dried at 110° C. for 120 seconds;

[0087] c) Dipping in nitrile latex: dipping the hand mold (temperature is 60° C.) after dipping in the coagulant in nitrile latex (temperature is 30° C.) for 5 seconds, wherein the solid content of the nitrile latex is 15 wt%, and then drying at 110° C. for 60 seconds; repeating the above-mentioned dipping in nitrile latex and drying operations once, i.e., performing the dipping in nitrile latex and drying operations twice in total, to obtain an initial glove substrate;

[0088] d) Leaching: Leaching the initial glove substrate at 60°C for 30 seconds, and then drying at 110°C for 60 seconds;

[0089] e) Curling and vulcanization: The leached glove substrate is curled and then vulcanized in an oven at 110° C. for 25 min to obtain a vulcanized glove substrate;

[0090] f) Chlorine washing and rinsing: The vulcanized glove substrate was washed with the chlorine washing solution described in Comparative Example 1 for 30 seconds, and then rinsed with pure water for 3 times, each rinsing time was 20 minutes, and dried at 100° C. for 3 minutes after rinsing, and demoulding was performed to obtain disposable nitrile rubber gloves.

[0091] Comparative Application Examples 2 to 5

[0092] The operation was carried out in accordance with the method of Application Example 1, except that the glove finishing agents used were the glove finishing agents prepared in Comparative Examples 2 to 5.

[0093] Test Example 1

[0094] 1. Smoothness test

[0095] The newly prepared disposable nitrile rubber 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 nitrile rubber gloves prepared using the glove finishing agent of the present invention have excellent smoothness.

[0096] Table 1 Friction coefficient test results of disposable nitrile rubber gloves

[0097]

[0098]

[0099] 2. Whether the coating falls off after wearing

[0100] 20 users were selected to blindly test the wearing effect of the newly prepared disposable nitrile rubber gloves, and the wearing time was 4 hours. After that, the gloves were taken off to observe whether the coating had fallen off, and the results are shown in Table 2. As can be seen from Table 2, the coating of the disposable nitrile rubber gloves prepared by the glove finishing agent of the present invention did not fall off after wearing, indicating that the coating formed by the glove finishing agent has excellent adhesion on the nitrile glove substrate.

[0101] Table 2 Whether the coating of disposable nitrile rubber gloves falls off after wearing

[0102] Sample source Experimental Results Application Example 1 No shedding Application Example 2 No shedding Application Example 3 No shedding Comparative application example 1 No shedding Comparative Application Example 2 Fingers and fingers partially fall off Comparative Application Example 3 Fingers and fingers partially fall off Comparative Application Example 4 Slight finger peeling Comparative Application Example 5 No shedding

[0103] 3. Adhesion test

[0104] The newly prepared disposable nitrile rubber 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 3. As can be seen from Table 3, the disposable nitrile rubber gloves prepared using the glove finishing agent of the present invention have excellent anti-adhesion properties.

[0105] Table 3 Adhesion test results of disposable nitrile rubber gloves

[0106] Sample source Test results Application Example 1 Non-stick Application Example 2 Non-stick Application Example 3 Non-stick Comparative application example 1 Non-stick Comparative Application Example 2 Slight adhesion between fingers Comparative Application Example 3 Fingers and palms are partially adhered Comparative Application Example 4 Non-stick Comparative Application Example 5 Fingers and fingers are partially stuck

[0107] 4. Aging resistance test

[0108] The newly prepared disposable nitrile rubber gloves were placed in a 70°C oven for 168 hours of aging. The mechanical properties of the disposable nitrile rubber gloves before and after aging were measured according to the standard GB / T528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber", and 3 groups of data were measured in parallel to take the average value. The results are shown in Table 4. As can be seen from Table 4, the coating formed by the use of styrene-butadiene emulsion as a film-forming substance in the present invention has a positive effect on improving the mechanical properties of the gloves after thermal aging, while the coating formed by the use of acrylic acid emulsion as a film-forming substance has a reduced mechanical property of the gloves after thermal aging.

[0109] Table 4 Aging resistance test results of disposable nitrile rubber gloves

[0110]

[0111] 5. Water resistance test

[0112] The newly prepared disposable nitrile rubber gloves were soaked in 70°C hot water for 1 hour, and then baked at 60°C for 1 hour to observe whether the coating fell off. The results are shown in Table 5. As can be seen from Table 5, the disposable nitrile rubber gloves prepared using the glove finishing agent of the present invention have excellent water resistance.

[0113] Table 5 Water resistance test results of disposable nitrile rubber gloves

[0114] Sample source Test results Application Example 1 No shedding Application Example 2 No shedding Application Example 3 No shedding Comparative application example 1 No shedding Comparative Application Example 2 Fingers are falling off Comparative Application Example 3 Fingers and palms are falling off Comparative Application Example 4 Slight loss of fingers Comparative Application Example 5 No shedding

[0115] 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 method for preparing nitrile rubber gloves without using a chlorine washing process, comprising the following steps: Provide nitrile rubber gloves base material; The nitrile rubber glove substrate is subjected to a first immersion treatment in a diluent of a finishing agent to obtain a composite glove substrate; vulcanizing the composite glove substrate to obtain the nitrile rubber gloves; The finishing agent comprises the following components in parts by mass: 30-50 parts of styrene-butadiene latex, 0.5-2 parts of wetting agent, 3-15 parts of lubricant, 0.2-0.8 parts of defoamer, 0.5-5 parts of rheological additive, 3-10 parts of lubricant-release agent and 40-60 parts of water.

2. The preparation method according to claim 1, characterized in that: The diluent of the finishing agent comprises a finishing agent and a diluent, and the mass ratio of the finishing agent to the diluent is 1:8-12.

3. The preparation method according to claim 1 or 2, 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 50° C., and the carboxyl-modified styrene butadiene latex includes LIGOS TM F3800, LJ1322 or LJ1225.

4. The preparation method according to claim 1 or 2, characterized in that: The conditions of the first immersion treatment include: the temperature of the diluted solution of the finishing agent is 50-55° C., and the immersion time is 5-10 seconds.

5. The preparation method according to claim 1, characterized in that: The vulcanization temperature is 105-120° C. and the vulcanization time is 20-30 minutes.

6. The preparation method according to claim 1, characterized in that: Before the first dipping treatment, the method further comprises: curling the nitrile rubber glove substrate.

7. The preparation method according to claim 1, characterized in that: The preparation method of the nitrile rubber glove substrate comprises the following steps: The hand mold is subjected to a second dipping treatment in nitrile latex, and an initial glove substrate is obtained after drying; The initial glove substrate is leached and dried to obtain the nitrile rubber glove substrate.

8. The preparation method according to claim 7, characterized in that: The second dipping treatment includes sequentially performing a first stage dipping and a second stage dipping, wherein the conditions of the first stage dipping and the second stage dipping independently include: the temperature of the nitrile latex is 20 to 40° C., and the dipping time is 4 to 8 seconds; The leaching conditions include: water temperature of 60-65° C. and leaching time of 25-40 seconds.

9. The preparation method according to claim 7 or 8, characterized in that: Before the second immersion treatment, the method further includes: washing the hand model and then performing a third immersion treatment in a coagulant.

10. The nitrile rubber gloves prepared by the preparation method according to any one of claims 1 to 9, comprising a nitrile rubber glove substrate and a coating attached to the inner surface of the nitrile rubber glove substrate, wherein the coating is formed by the finishing agent.

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