Special coating agent for butyronitrile gloves applied to clean room and preparation method of special coating agent

Abstract

The invention relates to the technical field of coating agents, in particular to a special butyronitrile glove coating agent applied to a clean room and a preparation method of the special butyronitrile glove coating agent. The ink is prepared from the following raw materials in parts by weight: 10-20 parts of hand feeling resin, 4-10 parts of a hand feeling aid, 3-5 parts of a flatting agent, 1-2 parts of an anti-freezing agent, 5-10 parts of a thickening agent, 2-4 parts of a pH regulator, 2-4 parts of a surfactant, 0.1-0.5 part of a bactericide, 3-6 parts of a wetting agent and 50-60 parts of a solvent. According to the special coating agent for the butyronitrile gloves applied to the clean room, a complex chlorine washing process is replaced, so that the butyronitrile gloves have excellent smoothness and anti-adhesion effect, meanwhile, the stability of a coating is improved, the demolding effect is smooth, and the coating agent has very high practical value.

Description

Technical Field

[0001] The invention relates to the technical field of finishing agents, and in particular to a special finishing agent for nitrile gloves used in a clean room and a preparation method thereof. Background Art

[0002] In a high-standard production environment, cleanrooms are an indispensable part of ensuring product quality and employee safety. They are widely used in high-tech manufacturing, pharmaceuticals and other fields, creating a dust-free and sterile working space for sensitive and precise production processes. In such an environment, cleanroom gloves have become the core protective equipment to protect employees' hands and prevent contamination, and their key role is obvious.

[0003] Nitrile cleanroom gloves, carefully made of high-quality nitrile latex, play an important role in many key cleanroom operation industries such as semiconductors, photovoltaics, food processing, chemical laboratories and medical due to their excellent chemical resistance, puncture resistance and abrasion resistance.

[0004] However, the current mainstream treatment technology relies on chlorine water to oxidize the glove surface to remove sticky substances and achieve smooth demoulding. However, in view of the fact that clean room nitrile gloves need to be used in a dust-free, sterile environment, and must not contain silicon and halogen elements, the chlorine water treatment method is not suitable enough. In order to solve this problem, it is urgent to develop a brand-new nitrile glove finishing agent that does not contain silicon and halogen to achieve anti-sticking effect and easy demoulding function, so as to better meet the application requirements of clean rooms. Chinese patent CN101050321A discloses an aloe finishing agent and its application, and the raw materials for preparation mainly include aloe extract, common finishing agent and other auxiliary agents, which are used for the finishing of latex gloves, PVC gloves or nitrile rubber gloves, and fiber or cotton clothes or leather surfaces. However, the finishing agent in the above technology is difficult to demould when used for nitrile rubber gloves, and large-area gloves will adhere after aging, and the stability is not high. Summary of the invention

[0005] In order to solve the problems in the prior art, the first aspect of the present invention provides a special coating agent for nitrile gloves used in clean rooms. The preparation raw materials include, by weight: 10-20 parts of hand feel resin, 4-10 parts of hand feel aid, 3-5 parts of leveling agent, 1-2 parts of antifreeze agent, 5-10 parts of thickener, 2-4 parts of pH adjuster, 2-4 parts of surfactant, 0.1-0.5 parts of bactericide, 3-6 parts of wetting agent, and 50-60 parts of solvent.

[0006] In one embodiment, the mass ratio of the hand feeling resin to the hand feeling aid is (8-10): (2-5).

[0007] In a preferred embodiment, the mass ratio of the hand feeling resin to the hand feeling aid is selected from any one of 4:1, 2:1, and 5:2.

[0008] In one embodiment, the hand-feel resin is a water-based polyurethane material.

[0009] In one embodiment, the average particle size D50 of the waterborne polyurethane material is 3.5-4 μm.

[0010] In one embodiment, the waterborne polyurethane material includes at least one of an acrylic modified polyurethane emulsion and a waterborne polyurethane dispersion.

[0011] In a preferred embodiment, the waterborne polyurethane material is an acrylic modified polyurethane emulsion.

[0012] In a more preferred embodiment, the acrylic modified polyurethane emulsion is of brand DR-789, purchased from Shanghai Pulide Industrial Co., Ltd.

[0013] In one embodiment, the feel aid is a wax emulsion.

[0014] In a preferred embodiment, the wax emulsion is high-density polyethylene wax.

[0015] In one embodiment, the wax emulsion has a melting point of 132° C. and an average particle size D50 of 3-5 μm.

[0016] In one embodiment, the wax emulsion is ADD-1682 was purchased from Guangzhou Jinyuan Material Technology Co., Ltd.

[0017] The inventors have found through a large number of creative experiments that the coating agent prepared by using a specific wax emulsion and water-based polyurethane substances in the nitrile gloves for clean room has excellent smooth feeling and anti-adhesion effect. ADD-1682 and the water-based polyurethane material are acrylic modified polyurethane emulsions with the brand name DR-789. When the mass ratio of the water-based polyurethane material to the wax emulsion is (8-10): (2-5), the coating agent not only improves the smoothness and anti-adhesion effect of the nitrile gloves, but also improves the stability of the coating and has a smooth demolding effect. The possible reasons are that, on the one hand, during the cooling process of the coating, the wax particles will recrystallize to form a thin and continuous wax-rich surface layer, which can change the friction coefficient (CoF) of the substrate, thereby giving the coating the required anti-sticking effect; on the other hand, the unique core-shell structure of the acrylic modified polyurethane emulsion improves the smoothness of the emulsion after film formation. When the average particle size D50 is further controlled to be 3.5-4μm, the melting point of the wax emulsion is 132°C, and the average particle size is 3-5μm, a uniform thin film can be formed on the coating surface, reducing the mutual friction between the particles and improving the smoothness of the coating; secondly, the acrylic modified polyurethane emulsion has good stability under the synergistic effect of the specific wax emulsion and other components in the system, thereby improving the stability of the coating agent.

[0018] In one embodiment, the leveling agent is a polyurethane leveling agent.

[0019] In one embodiment, the polyurethane leveling agent is a non-ionic hydrophobically modified polyurethane leveling agent.

[0020] In a preferred embodiment, the non-ionic hydrophobically modified polyurethane leveling agent is of brand H200D, purchased from Hefei Huayue New Material Technology Co., Ltd.

[0021] In one embodiment, the antifreeze agent comprises isopropyl alcohol.

[0022] In a preferred embodiment, the isopropanol is purchased from PetroChina Jinzhou Petrochemical Company.

[0023] In one embodiment, the thickener is an anionic thickener.

[0024] In one embodiment, the brand of the anionic thickener is RT-300RM, which is purchased from Beijing Runbo Hengtong Technology Co., Ltd.

[0025] In one embodiment, the pH adjuster is of brand HR-95, purchased from Wuxi Hairuo New Materials Co., Ltd.

[0026] In one embodiment, the surfactant comprises a nonionic surfactant.

[0027] In a preferred embodiment, the nonionic surfactant is a nonionic surfactant that does not contain alkylphenol.

[0028] In a more preferred embodiment, the non-ionic surfactant not containing alkylphenol is of brand Wink061, purchased from Jingzhijie (Beijing) Technology Co., Ltd.

[0029] In one embodiment, the fungicide is TNB-5, which is purchased from Tianshi Landun Technology Co., Ltd.

[0030] In one embodiment, the wetting agent is a silicon-free wetting agent.

[0031] In a preferred embodiment, the grade of the silicon-free wetting agent is H-306 was purchased from Haichuan New Material Technology Co., Ltd.

[0032] In one embodiment, the solvent is deionized water.

[0033] The second aspect of the present invention provides a method for preparing a special finishing agent for nitrile gloves used in a clean room, comprising at least the following steps:

[0034] S1. Add solvent into the batching tank and add the hand feeling resin, hand feeling additive, leveling agent and antifreeze agent in sequence under stirring;

[0035] S2. Continue to add thickener and stir at 500r / min for 10-15min;

[0036] S3. After adding the pH adjuster while maintaining the speed, increase the speed to 800-1000r / min and stir for 20-30min. Keeping the speed unchanged, add the fungicide and wetting agent in sequence and stir.

[0037] In one embodiment, the interval time for adding the hand feeling resin, the hand feeling aid, the leveling agent, and the antifreeze agent in step S1 is 5 minutes.

[0038] In one embodiment, the stirring speed in step S1 is 290-310 r / min, which can be 2900 r / min, 3000 r / min, or 3100 r / min.

[0039] In a preferred embodiment, the stirring speed in step S1 is 300 r / min.

[0040] In one embodiment, in step S1, after adding the antifreeze agent, stirring is performed for 20-30 minutes before step S2 is performed, which may be 20 minutes, 25 minutes, or 30 minutes.

[0041] In a preferred embodiment, after adding the antifreeze in step S1, stirring for 20-30 minutes is performed before step S2.

[0042] In one embodiment, the step S2 specifically comprises: continuing to add the thickener and stirring at 500 r / min for 10 min;

[0043] In one embodiment, the interval time for adding the bactericide and the wetting agent in step S3 is 5 minutes; and the stirring time is 30-40 minutes.

[0044] In a preferred embodiment, the step S3 is specifically as follows: maintaining the rotation speed, adding the pH regulator, increasing the rotation speed to 900 r / min and stirring for 20 minutes, maintaining the rotation speed unchanged, adding the bactericide for 5 minutes, and then adding the wetting agent, stirring for 30 minutes.

[0045] Beneficial Effects

[0046] 1. The special coating agent for nitrile gloves used in clean rooms provided in this application replaces the complicated chlorine washing process, so that the nitrile gloves have excellent smooth feeling and anti-adhesion effect.

[0047] 2. This application uses a specific hand-feel resin acrylic modified polyurethane emulsion, and limits its pathogen particle size D50 to 3.5-4 μm, which can improve the smoothness of the coating and smooth the demoulding effect.

[0048] 3. This application selects a specific wax emulsion as a hand feel enhancer, and further limits the melting point of the wax emulsion to 132°C and the average particle size to 3-5 μm, which can make the nitrile gloves have excellent smooth feeling and anti-adhesion effect.

[0049] 4. This application selects specific hand-feel resins and hand-feel additives, and limits the mass ratio of the two to (8-10): (2-5), which not only improves the smoothness and anti-adhesion effect of nitrile gloves, but also improves the stability of the coating and the demolding effect is smooth.

[0050] 5. The preparation method of the special coating agent for nitrile gloves used in clean rooms provided in this application has simple process, high production efficiency and high practical value. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The experimental methods in the examples without specifying specific conditions are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used without specifying the manufacturer are all conventional products that can be purchased commercially.

[0052] Example 1

[0053] The first aspect of the present embodiment provides a special coating agent for nitrile gloves used in clean rooms. The raw materials for preparation include, by weight: 20 parts of hand feeling resin, 8 parts of hand feeling aid, 5 parts of leveling agent, 1 part of antifreeze agent, 8 parts of thickener, 3 parts of pH adjuster, 3 parts of surfactant, 0.2 parts of bactericide, 1 part of wetting agent, and 55 parts of solvent.

[0054] The hand-feel resin is an acrylic acid-modified polyurethane emulsion. The brand of the acrylic acid-modified polyurethane emulsion is DR-789, which is purchased from Shanghai Pulide Industrial Co., Ltd.

[0055] The hand feel aid is a wax emulsion. The brand of the wax emulsion is ADD-1682 was purchased from Guangzhou Jinyuan Material Technology Co., Ltd.

[0056] The leveling agent is a non-ionic hydrophobically modified polyurethane leveling agent. The brand of the non-ionic hydrophobically modified polyurethane leveling agent is H200D, which is purchased from Hefei Huayue New Material Technology Co., Ltd.

[0057] The antifreeze agent includes isopropanol, which is purchased from Jinzhou Petrochemical Company of PetroChina Co., Ltd.

[0058] The thickener is an anionic thickener. The brand of the anionic thickener is RT-300RM, purchased from Beijing Runbo Hengtong Technology Co., Ltd.

[0059] The pH regulator is HR-95, purchased from Wuxi Hairuo New Materials Co., Ltd.

[0060] The surfactant is a non-ionic surfactant that does not contain alkylphenol, with a brand name of Wink 061, purchased from Jingzhijie (Beijing) Technology Co., Ltd.

[0061] The fungicide is TNB-5, purchased from Tianshi Landun Technology Co., Ltd.

[0062] The wetting agent is a silicon-free wetting agent with a brand name of H-306 was purchased from Haichuan New Material Technology Co., Ltd.

[0063] The solvent is deionized water.

[0064] The second aspect of the present embodiment provides a method for preparing a special finishing agent for nitrile gloves used in a clean room, comprising at least the following steps:

[0065] S1. Add solvent into the batching tank, and add the hand feeling resin, hand feeling aid, leveling agent and antifreeze agent in sequence under the stirring state of the stirring speed of 300r / min; the addition interval of the hand feeling resin, hand feeling aid, leveling agent and antifreeze agent is 5min;

[0066] S2, continue to add thickener and stir at 500r / min for 10min;

[0067] S3. Keep the speed constant, add the pH regulator, then increase the speed to 900r / min and stir for 20min. Keep the speed constant, add the fungicide for 5min, then add the wetting agent and stir for 30min.

[0068] In the step S1, after adding the antifreeze agent, stirring for 20 minutes is performed and then the step S2 is performed.

[0069] Example 2

[0070] The specific implementation method of this embodiment is the same as that of Example 1, except that, calculated by weight, the prepared raw materials include: 20 parts of hand feel resin, 10 parts of hand feel aid, 5 parts of leveling agent, 1 part of antifreeze agent, 8 parts of thickener, 3 parts of pH adjuster, 3 parts of surfactant, 0.2 parts of bactericide, 1 part of wetting agent, and 55 parts of solvent.

[0071] Example 3

[0072] The specific implementation method of this embodiment is the same as that of Example 1, except that, calculated by weight, the prepared raw materials include: 16 parts of hand feel resin, 8 parts of hand feel aid, 5 parts of leveling agent, 1 part of antifreeze agent, 8 parts of thickener, 3 parts of pH adjuster, 3 parts of surfactant, 0.2 parts of bactericide, 1 part of wetting agent, and 55 parts of solvent.

[0073] Example 4

[0074] The specific implementation method of this embodiment is the same as that of Example 1, except that, calculated by weight, the prepared raw materials include: 16 parts of hand feel resin, 4 parts of hand feel aid, 5 parts of leveling agent, 1 part of antifreeze agent, 8 parts of thickener, 3 parts of pH adjuster, 3 parts of surfactant, 0.2 parts of bactericide, 1 part of wetting agent, and 55 parts of solvent.

[0075] Comparative Example 1

[0076] The specific implementation method of this comparative example is the same as that of Example 1, except that, calculated by weight, the prepared raw materials include: 16 parts of hand feeling resin, 8 parts of hand feeling aid, 5 parts of leveling agent, 1 part of antifreeze agent, 8 parts of thickener, 3 parts of pH adjuster, 3 parts of surfactant, 0.2 parts of bactericide, 1 part of wetting agent, and 55 parts of solvent.

[0077] The hand-feel resin is an anionic waterborne polyurethane dispersion. The brand of the anionic waterborne polyurethane dispersion is ADT-0765, which is purchased from Guangzhou Edit New Material Technology Co., Ltd.

[0078] Comparative Example 2

[0079] The specific implementation method of this comparative example is the same as that of Example 1, except that, calculated by weight, the prepared raw materials include: 16 parts of hand feeling resin, 8 parts of hand feeling aid, 5 parts of leveling agent, 1 part of antifreeze agent, 8 parts of thickener, 3 parts of pH adjuster, 3 parts of surfactant, 0.2 parts of bactericide, 1 part of wetting agent, and 55 parts of solvent.

[0080] The hand-feel resin is an acrylic acid-modified polyurethane emulsion. The brand of the acrylic acid-modified polyurethane emulsion is DR-781, which is purchased from Shanghai Pulide Industrial Co., Ltd.

[0081] Comparative Example 3

[0082] The specific implementation method of this comparative example is the same as that of Example 1, except that, calculated by weight, the prepared raw materials include: 16 parts of hand feeling resin, 8 parts of hand feeling aid, 5 parts of leveling agent, 1 part of antifreeze agent, 8 parts of thickener, 3 parts of pH adjuster, 3 parts of surfactant, 0.2 parts of bactericide, 1 part of wetting agent, and 55 parts of solvent.

[0083] The hand feel additive is a wax microdispersion. The wax microdispersion is DHX-3040B and is purchased from Wuxi Dinghengxin New Material Technology Co., Ltd.

[0084] Comparative Example 4

[0085] The specific implementation method of this comparative example is the same as that of Example 1, except that, calculated by weight, the prepared raw materials include: 16 parts of hand feeling resin, 8 parts of hand feeling aid, 5 parts of leveling agent, 1 part of antifreeze agent, 8 parts of thickener, 3 parts of pH adjuster, 3 parts of surfactant, 0.2 parts of bactericide, 1 part of wetting agent, and 55 parts of solvent.

[0086] The hand feeling aid is high-density polyethylene wax. The brand of the high-density polyethylene wax is Polychem 2145, which is purchased from China Wax Technology (Guangzhou) Co., Ltd.

[0087] Comparative Example 5

[0088] The specific implementation method of this comparative example is the same as that of Example 1, except that, calculated by weight, the prepared raw materials include: 16 parts of hand feeling resin, 8 parts of hand feeling aid, 5 parts of leveling agent, 1 part of antifreeze agent, 8 parts of thickener, 3 parts of pH adjuster, 3 parts of surfactant, 0.2 parts of bactericide, 1 part of wetting agent, and 55 parts of solvent.

[0089] The hand feeling aid is high-density polyethylene wax. The brand of the high-density polyethylene wax is Polychem 2155, which is purchased from China Wax Technology (Guangzhou) Co., Ltd.

[0090] Comparative Example 6

[0091] The specific implementation method of this comparative example is the same as that of Example 1, except that, calculated by weight, the prepared raw materials include: 16 parts of hand feeling resin, 8 parts of hand feeling aid, 5 parts of leveling agent, 1 part of antifreeze agent, 8 parts of thickener, 3 parts of pH adjuster, 3 parts of surfactant, 0.2 parts of bactericide, 1 part of wetting agent, and 55 parts of solvent.

[0092] The hand feel aid is an amide-modified synthetic wax. The grade of the amide-modified synthetic wax is 2740TP, purchased from Klein Chemical Co., Ltd.

[0093] Performance Testing

[0094] The special finishing agent for nitrile gloves used in clean rooms prepared in each embodiment and comparative example was dip-coated on nitrile gloves to conduct the following tests:

[0095] (1) Appearance of coating: observe whether the coating is uniform and whether there are flow marks;

[0096] (2) Smoothness of coating: Use a friction coefficient meter to test the static friction coefficient and dynamic friction coefficient (the lower the friction coefficient, the better the smoothness);

[0097] (3) Aging adhesion: The process conditions are: placing the gloves in an oven at 100 degrees Celsius for 24 hours with a load of 6 kg;

[0098] (4) Stability of the coating: Place the coating at room temperature to observe whether there is any stratification or whitening.

[0099] The dipping method of nitrile gloves is as follows: dilute the special coating agent for nitrile gloves used in clean rooms by 10 times, disperse it at a low speed for 5 minutes, immerse the nitrile gloves in the diluted and dispersed coating agent for 8 seconds, and place the gloves in an oven for vulcanization. The vulcanization time and temperature are 18 minutes and 85°C respectively.

[0100] The test results are shown in Table 1.

[0101] Table 1

[0102]

[0103]

Claims

1. A special finishing agent for nitrile gloves used in clean rooms, characterized in that: Calculated by weight, the raw materials include: 10-20 parts of hand feeling resin, 4-10 parts of hand feeling additive, 3-5 parts of leveling agent, 1-2 parts of antifreeze agent, 5-10 parts of thickener, 2-4 parts of pH adjuster, 2-4 parts of surfactant, 0.1-0.5 parts of bactericide, 3-6 parts of wetting agent and 50-60 parts of solvent.

2. The special finishing agent for nitrile gloves used in clean rooms according to claim 1, characterized in that: The mass ratio of the hand feeling resin to the hand feeling additive is (8-10):(2-5).

3. The special finishing agent for nitrile gloves used in clean rooms according to claim 1, characterized in that: The hand-feel resin is a water-based polyurethane material.

4. The special finishing agent for nitrile gloves used in clean rooms according to claim 3, characterized in that: The average particle size D50 of the waterborne polyurethane material is 3.5-4 μm.

5. The special finishing agent for nitrile gloves used in clean rooms according to claim 3 or 4, characterized in that: The waterborne polyurethane material includes at least one of acrylic modified polyurethane emulsion and waterborne polyurethane dispersion.

6. The special finishing agent for nitrile gloves used in clean rooms according to claim 1, characterized in that: The hand feeling aid is a wax emulsion.

7. The special finishing agent for nitrile gloves used in clean rooms according to claim 6, characterized in that: The wax emulsion has a melting point of 132° C. and an average particle size D50 of 3-5 μm.

8. A method for preparing a special finishing agent for nitrile gloves used in clean rooms according to any one of claims 1 to 7, characterized in that: At least the following steps are included: S1. Add solvent into the batching tank and add feel resin, feel additive, leveling agent and antifreeze agent in sequence under stirring; S2. Continue to add thickener and stir at 500r / min for 10-15min; S3. After adding the pH adjuster while maintaining the speed, increase the speed to 800-1000r / min and stir for 20-30min. Keeping the speed unchanged, add the fungicide and wetting agent in sequence and stir.

9. The method for preparing a special finishing agent for nitrile gloves used in clean rooms according to claim 8, characterized in that: In the step S1, the interval time for adding the hand feeling resin, the hand feeling aid, the leveling agent and the antifreeze agent is 5 minutes.

10. The method for preparing a special finishing agent for nitrile gloves used in clean rooms according to claim 8, characterized in that: In the step S3, the interval time for adding the bactericide and the wetting agent is 5 minutes; and the stirring time is 30-40 minutes.

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