Coating material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of coatings, in particular to the field of IPC C09F, and more particularly relates to a coating material and a preparation method and application thereof.The coating material is prepared from 30-50 parts of resin emulsion, 35-60 parts of deionized water, 0.5-2 parts of a wetting agent, 3-15 parts of a smooth auxiliary agent, 0.5-2.5 parts of matting powder, 0.3-0.5 part of a dispersing agent, 3-10 parts of a functional auxiliary agent, 0.2-0.8 part of a defoaming agent and 0.5-5 parts of a rheological auxiliary agent. When applied to a butyronitrile glove dip-coating process, the emulsion can replace a chlorine washing process, promote glove demolding and properly reduce the use amount of a demolding agent; the fabric is excellent in smoothness and convenient to wear; the sweat yellowing resistance is good; the organic silicon modified emulsion is used as the resin emulsion, so that the adhesive force and the water resistance of the coating can be improved, the smoothness of the coating is improved, and glove demolding is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of coating technology, in particular to the field of IPC C09F, and more specifically to a coating material and a preparation method and application thereof. Background Art

[0002] The traditional post-processing method of nitrile gloves is mainly through the chlorine washing process. In the field of chemical surface treatment technology, the chlorine washing process is a commonly used surface treatment method. It can reduce the adhesion of the substrate, remove impurities and additives remaining on the surface of the material, and improve performance. It is often used for surface treatment in medical devices, food packaging and other fields. Nitrile rubber gloves using chlorine washing processing technology. Not only are the gloves silky and smooth to wear, but they also feel very good to wear. The chlorine washing process can use the current plating processing technology, which can reduce the cost of gloves. The earliest chlorine washing is to use chlorine gas into the water to prepare chlorine washing solution. This method requires the operator to take chlorine gas into the water. There is a risk of chlorine gas escaping during the entire operation process, and the storage of chlorine gas cylinders is also inconvenient. Although the chlorine washing process can improve the performance of gloves, its existing problems limit its application scope and use effect.

[0003] CN106397894A discloses a method for preparing nitrile gloves, including preparing latex raw materials for nitrile gloves, acid washing, first water washing, alkali washing, second water washing, drying, chlorine washing the hand model, dipping the hand model in a coagulant solution, dipping the hand model, cleaning the film, and demoulding the film. Wherein a chlorine washing is performed once, and the chlorine washing is performed before dipping the hand model, that is, the hand model is first chlorinated before dipping the hand model, so that the surface of the nitrile gloves formed after dipping is smooth, convenient to wear and non-adhesive, and the processing procedure is simplified, and the chlorine content of the nitrile gloves is greatly reduced, but the chlorine washing process will produce a large amount of chlorine-containing wastewater, causing serious pollution to the environment. Secondly, the chlorine washing process is harmful to the human body, and long-term contact with chlorine water may cause damage to the skin, respiratory tract, etc. In addition, the chlorine washing process easily causes excessive aging of the gloves, thereby affecting the service life of the gloves, and the release agent dosage will bring a powdery feeling, and it will cause the hand model to be difficult to clean, thereby causing the problem of increased defective rate of gloves. Summary of the invention

[0004] The first aspect of the present invention provides a coating material, which comprises, by weight, 30 to 50 parts of resin emulsion, 35 to 60 parts of deionized water, 0.5 to 2 parts of wetting agent, 3 to 15 parts of slip agent, 0.5 to 2.5 parts of matting powder, 0.3 to 0.5 parts of dispersant, 3 to 10 parts of functional additives, 0.2 to 0.8 parts of defoaming agent, and 0.5 to 5 parts of rheological additive.

[0005] Preferably, the components include, by weight: 35-45 parts of resin emulsion, 35-55 parts of deionized water, 0.5-1 parts of wetting agent, 4-8 parts of slip agent, 0.5-2.5 parts of matting powder, 0.3-0.5 parts of dispersant, 3-10 parts of functional additives, 0.2-0.8 parts of defoaming agent, and 0.5-2 parts of rheological additive.

[0006] The resin emulsion includes an organosilicon-modified waterborne polyurethane resin emulsion and / or an organosilicon-modified acrylic emulsion.

[0007] The viscosity of the silicone-modified acrylic emulsion at 25° C. is 1500-6000 mPa·s.

[0008] Preferably, the viscosity of the silicone-modified acrylic emulsion at 25° C. is 3000-5000 mPa·s.

[0009] Preferably, the resin emulsion comprises at least one of the following models: Dolphin 1087R3 (Silok), WH103C (Wanhua New Materials) and any one of the products prepared in Examples 1-3 in Chinese invention patent CN108840987 B.

[0010] The present application has found that the resin emulsion includes a silicone-modified waterborne polyurethane resin emulsion and / or a silicone-modified acrylic emulsion, which can improve the adhesion and water resistance of the coating, while increasing the slipperiness of the coating, which is beneficial to the demolding of the gloves. Further research has found that the slip aid includes a wax emulsion and a silicone emulsion, and the weight ratio of the wax emulsion to the silicone emulsion is 1: (1-9), which can reduce the adhesion effect, thereby reducing the amount of the release agent and improving the durability of the gloves. Further research has found that the weight ratio of the wax emulsion to the silicone emulsion is 1: (1-4), which can improve the yellowing resistance of nitrile gloves. This may be due to the interaction between the silicone compound in the two emulsions and the polyether segment in the resin emulsion, thereby improving the stability of the segment.

[0011] The wetting agent includes polyether-modified silicones.

[0012] Preferably, the polyether-modified silicone includes at least one of the following models: TEGO-270, TEGO-4100, YMT-328, YMT-245, and YMT-320.

[0013] Preferably, the dispersant includes at least one of BYK-110, BYK-111, BYK-191, BYK-121, and Disponer W-18.

[0014] The slip agent comprises wax emulsion and silicone emulsion, and the weight ratio of the wax emulsion to the silicone emulsion is 1:(1-9).

[0015] Preferably, the weight ratio of the wax emulsion to the silicone emulsion is 1:(1-4).

[0016] More preferably, the weight ratio of the wax emulsion to the silicone emulsion is 1:(1-2).

[0017] Preferably, the wax emulsion includes at least one of the following models: MD-2011 (Keim-Additec, Germany), D-806 (Keim-Additec, Germany), PEW-2011 (Tianshi), and the silicone emulsion includes at least one of the following models: DC-51 (Dow Corning), 9146M (Silco), T-52 (Silcona, Germany).

[0018] The matting powder includes silicon dioxide and / or talc.

[0019] Preferably, the average particle size of the matting powder is 2-10 microns.

[0020] Further preferably, the matting powder includes at least one of the following models: Evonik ACEMATT OK 520 and Tosoh SS-50C.

[0021] The defoaming agent includes a polyether siloxane defoaming agent.

[0022] Preferably, the defoaming agent includes at least one of the following types: FOAMEX 822, FOAMEX 805N and DAPRO DF7072.

[0023] Selected rheology modifiers include alkali swellable acrylics and / or cellulosics.

[0024] Preferably, the rheological additive includes at least one of the following models: DR50 (Dow), C-1 (China Federation), SN580 (Shanghai Snow Chemical).

[0025] A second aspect of the present invention provides a method for preparing a coating material, comprising the following steps:

[0026] S1, adding matting powder, dispersant and defoaming agent into deionized water, stirring evenly to obtain a mixture;

[0027] S2, adding the resin emulsion, wetting agent, slip agent, functional agent and rheological agent into the mixture, stirring evenly to obtain.

[0028] Preferably, the method comprises the following steps:

[0029] S1, adding matting powder, dispersant and defoaming agent to deionized water in sequence, stirring evenly to obtain a mixture;

[0030] S2, adding resin emulsion, wetting agent, slip agent, functional agent and rheological agent to the mixture in sequence, wherein each material is stirred for 1-5 minutes after addition, and then the next material is added. After all materials are added, high-speed stirring is performed at 1500-2500 rpm for 1-3 hours until they are evenly stirred to obtain the product.

[0031] A third aspect of the present invention provides an application of a coating material, which is applied to a dipping process of nitrile gloves, wherein the coagulant system of the dipping process contains 0.5-1.5wt% of a release agent.

[0032] Beneficial Effects

[0033] 1. The resin emulsion includes an organosilicon-modified waterborne polyurethane resin emulsion and / or an organosilicon-modified acrylic emulsion,

[0034] It can improve the adhesion and water resistance of the coating, while increasing the smoothness of the coating, which is beneficial for glove demoulding.

[0035] 2. The slip agent includes wax emulsion and silicone emulsion, and the weight ratio of the wax emulsion to the silicone emulsion is

[0036] The ratio of 1: (1-9) can reduce the adhesion effect, thereby reducing the amount of release agent used and improving the durability of the gloves.

[0037] 3. The weight ratio of wax emulsion to silicone emulsion is 1:(1-4), which can improve the yellowing resistance of nitrile gloves.

[0038] 4. The coating material prepared in this application is applied to the dipping process of nitrile gloves, which can replace the existing chlorine washing process and increase environmental protection.

[0039] 5. The coating material prepared in this application has good sweat resistance and can further improve the wearability. DETAILED DESCRIPTION

[0040] Example 1

[0041] A coating material, comprising the following components, by weight: 40 parts of a resin emulsion (the resin emulsion of Example 2 of Chinese invention patent CN108840987B), 47.4 parts of deionized water, 0.6 parts of a wetting agent (YMT-328), 4.8 parts of a slip agent, 1 part of a matting agent (ACEMATT OK 520 produced by Evonik), 0.3 parts of a dispersant (BYK-191), 4 parts of a functional additive (the functional additive of Example 2 of Chinese invention patent CN115926524B), 0.3 parts of a defoaming agent (FOAMEX 822), and 1.6 parts of a rheological additive (China Federation C-1).

[0042] The slip agent is composed of a wax emulsion (MD-2011 from Keim-Additec, Germany) and an organosilicon emulsion (DC-51), and the weight ratio of the wax emulsion to the organosilicon emulsion is 1:1.

[0043] A method for preparing a coating material comprises the following steps:

[0044] Add 2.37kg of deionized water to the batching tank, start stirring, and add 0.015kg of dispersant, 0.015kg of defoamer, and 0.05kg of matting powder 1 in sequence while stirring, and stir for 15 minutes. Then add 2.0kg of resin emulsion, 0.12kg of wax emulsion, 0.12kg of silicone emulsion, 0.2kg of functional additives, 0.08kg of rheological additives, and 0.03kg of wetting agent in sequence. Stir for 3 minutes after adding each material, and then add the next material. After all materials are added, stir at 1800rpm for 2 hours.

[0045] Example 2

[0046] A coating material, comprising the following components, by weight: 35 parts of resin emulsion (Wanhua New Materials WH103C), 49.56 parts of deionized water, 0.6 parts of wetting agent (TEGO4100), 5 parts of slip agent, 2.4 parts of matting powder (ACEMATT OK 520 from Evonik), 0.4 parts of dispersant (BYK-191), 5 parts of functional additive (functional additive of Example 2 in Chinese invention patent CN115926524B), 0.24 parts of defoaming agent (FOAMEX 805N), and 1.8 parts of rheological additive (SN580 from Shanghai Snow Chemical).

[0047] The slip agent is composed of wax emulsion (D-806) and silicone emulsion (T-52), and the weight ratio of the wax emulsion to the silicone emulsion is 1:1.5.

[0048] A method for preparing a coating material comprises the following steps:

[0049] Add 2.478kg of deionized water to the batching tank, start stirring, and add 0.02kg of dispersant, 0.012kg of defoamer, and 0.12kg of matting powder in sequence while stirring, and stir for 15 minutes. Then add 1.75kg of resin emulsion, 0.10kg of wax emulsion, 0.15kg of silicone emulsion, 0.25kg of functional additives, 0.09kg of rheological additives, and 0.03kg of wetting agent in sequence. Stir for 3 minutes after adding each material, and then add the next material. After all materials are added, stir at 1800rpm for 2 hours.

[0050] Example 3

[0051] A coating material comprises the following components, measured by weight: 45 parts of a resin emulsion (Dolphin 1087R3), 38.56 parts of deionized water, 0.8 parts of a wetting agent (YMT-320), 6 parts of a slip agent, 1.5 parts of a matting powder (Tosoh SS-50C), 0.3 parts of a dispersant (Disponer W-18), 6 parts of a functional additive (the functional additive of Example 2 in Chinese invention patent CN115926524B), 0.24 parts of a defoaming agent (DAPRO DF7072), and 1.6 parts of a rheological additive (Dow DR50).

[0052] The slip agent consists of a wax emulsion (PEW-2011) and an organosilicon emulsion (9146M), and the weight ratio of the wax emulsion to the organosilicon emulsion is 1:2.

[0053] A method for preparing a coating material comprises the following steps:

[0054] Add 1.928kg of deionized water to the batching tank, start stirring, and add 0.015kg of dispersant, 0.012kg of defoamer, and 0.075kg of matting powder in sequence while stirring, and stir for 15 minutes. Then add 2.25kg of resin emulsion, 0.1kg of wax emulsion, 0.2kg of silicone feel agent, 0.3kg of functional additive, 0.08kg of rheological additive, and 0.04kg of wetting agent in sequence. Stir for 3 minutes after adding each material, and then add the next material. After all materials are added, stir at 1800rpm for 2 hours.

[0055] The slip agent is composed of wax emulsion (D-806) and silicone emulsion (T-52), and the weight ratio of the wax emulsion to the silicone emulsion is 1:1.5.

[0056] Example 4

[0057] A coating material, comprising the following components, by weight: 46 parts of resin emulsion (34.5 parts of resin emulsion of Example 2 of Chinese invention patent CN108840987B and 11.5 parts of Wanhua New Materials WH103C), 54.51 parts of deionized water, 0.69 parts of wetting agent (YMT-328), 5.52 parts of slip agent, 1.15 parts of matting powder (Tosoh SS-50C), 0.345 parts of dispersant (BYK-191), 4.6 parts of functional additive (Example 2 of Chinese invention patent CN115926524B), 0.345 parts of defoaming agent (FOAMEX 822), and 1.84 parts of rheological additive (China Federation C-1).

[0058] The slip agent is composed of a wax emulsion (MD-2011 from Keim-Additec, Germany) and an organosilicon emulsion (DC-51), and the weight ratio of the wax emulsion to the organosilicon emulsion is 1:1.

[0059] A method for preparing a coating material comprises the following steps:

[0060] Add 2.37kg of deionized water to the batching tank, start stirring, and add 0.015kg of dispersant, 0.015kg of defoamer, and 0.05kg of matting powder in sequence while stirring, and stir for 15 minutes. Then add 2kg of resin emulsion, 0.12kg of wax emulsion, 0.12kg of silicone emulsion, 0.2kg of functional additives, 0.08kg of rheological additives, and 0.03kg of wetting agent in sequence. Stir for 3 minutes after adding each material, and then add the next material. After all materials are added, stir at 1800rpm for 2 hours.

[0061] Comparative Example 1

[0062] Chlorine wash solution with 300 ppm chlorine.

[0063] The specific formula of the chlorine washing liquid is: 27mL of sodium hypochlorite solution (effective chlorine 10%), 10g of sodium hydroxide, 3g of surfactant AEO-9, and the remaining deionized water is adjusted to 10L to obtain 10L of chlorine washing liquid with a chlorine content of 300ppm.

[0064] Comparative Example 2

[0065] Commercially available Malaysian B232 nitrile coating agent.

[0066] Performance Testing Methods

[0067] The products prepared in the examples and comparative examples were applied to dip coating of nitrile gloves.

[0068] 1. Preparation method of impregnation material dilution solution: dilute the impregnation materials prepared in Examples 1, 2, 3, and 4 with the sample of Comparative Example 2 in a ratio of 1:10, weigh 1 kg of the impregnation material into a batching tank, add 10 kg of deionized water, and disperse and stir at 300 rpm for 30 minutes for use.

[0069] Then, the gloves are prepared according to the nitrile gloves dip coating process of the present invention. The details are as follows:

[0070] Hand mold pre-treatment → latex dipping → leaching → lip curling → dip coating → vulcanization → demoulding.

[0071] a) Washing the mold, acid washing, the pH value of the acid tank is about 2; alkali washing, the pH value of the alkali tank is about 11; hot water washing, the temperature is 65℃, and the hand mold is dried at 80℃.

[0072] b) The hand mold is immersed in coagulant at 65°C for 15 seconds and dried at 105°C for 120 seconds;

[0073] c) dipping the first layer of nitrile latex for 6 seconds, the nitrile latex temperature is 30° C., and the solid content is 15%; and baking at 105° C. for 60 seconds;

[0074] d) dipping in a second layer of nitrile latex for 6 seconds, the nitrile latex temperature is 30° C., and the solid content is 15%; and baking at 105° C. for 60 seconds;

[0075] e) leaching for 30 seconds at 60°C and drying at 105°C for 60 seconds;

[0076] f) curling;

[0077] g) impregnating the impregnation material prepared in the relevant embodiment or comparative example for 6 seconds;

[0078] The gloves were vulcanized in an oven at 105° C. for 25 minutes and demoulded to obtain disposable nitrile rubber gloves.

[0079] The gloves of Comparative Example 1 were prepared according to the chlorine treatment process of nitrile gloves.

[0080] Prepare chlorine water with a PPM of about 300, and prepare gloves according to the chlorine washing process for nitrile gloves:

[0081] Hand model pre-treatment → latex dipping → leaching → lip curling → vulcanization → chlorine washing → rinsing → drying → demoulding. The specific steps are as follows:

[0082] r) Washing the mold, sequentially undergoing acid washing, the pH value of the acid tank is about 2; alkali washing, the pH value of the alkali tank is about 11; hot water washing, the temperature is 65°C, and the hand mold is dried at 80°C.

[0083] s) The hand mold is immersed in coagulant at 65°C for 15 seconds and dried at 105°C for 120 seconds;

[0084] t) dipping the first layer of nitrile latex for 5 seconds, the nitrile latex temperature is 30° C., and the solid content is 15%; and baking at 105° C. for 60 seconds;

[0085] u) dipping in a second layer of nitrile latex for 5 seconds, the nitrile latex temperature is 30° C., and the solid content is 15%; and drying at 105° C. for 60 seconds;

[0086] v) leaching for 30 seconds at 60°C and drying at 105°C for 60 seconds;

[0087] w) curling, and then vulcanizing in an oven at 105° C. for 25 minutes to obtain the prepared nitrile gloves;

[0088] x) Chlorine washing: washing the gloves prepared in step w) with chlorine water having a PPM of about 300 for 1-3 minutes;

[0089] y) Rinse with reverse osmosis pure water 3 times, 20 minutes each time;

[0090] The prepared composite gloves were dried at 100° C. and demoulded to obtain disposable nitrile rubber gloves.

[0091] The coagulant system consists of: 10 wt% calcium nitrate tetrahydrate (Sanxi Chemical), 0.9 wt% mold release agent (Budget Champ Sdn Bhd, CTF-M2), 0.2 wt% wetting agent (Huntsman TERIC 320), and 88.9 wt% deionized water.

[0092] 2. Glove performance test: The results are summarized in Table 1.

[0093] 1. Wearing comfort

[0094] 20 users were selected to blindly test the wearing comfort of the glove products of the embodiments, with the usage experience of more than 80% being taken as the standard.

[0095] 2. Accelerate aging at a temperature of 70±2°C and a pressure of 3±0.2kg, and observe the adhesion after 24 hours.

[0096] 3. Soak the gloves in artificial sweat and place them in a 37℃ constant temperature box. After 4 hours, pour out the liquid and observe whether the gloves turn yellow. The pH of artificial sweat is 6.5±0.1. Soak 3 gloves of the same sample in parallel.

[0097] 4. Demolding effect: observe the demoulding effect with naked eyes.

[0098] Performance test data

[0099] Table 1

[0100]

Claims

1. A coating material, characterized in that: In parts by weight, the components include: 30-50 parts of resin emulsion, 35-60 parts of deionized water, 0.5-2 parts of wetting agent, 3-15 parts of slip agent, 0.5-2.5 parts of matting powder, 0.3-0.5 parts of dispersant, 3-10 parts of functional additives, 0.2-0.8 parts of defoaming agent, and 0.5-5 parts of rheological additive.

2. The coating material according to claim 1, characterized in that The resin emulsion includes an organosilicon-modified waterborne polyurethane resin emulsion and / or an organosilicon-modified acrylic emulsion.

3. The coating material according to claim 2, characterized in that The viscosity of the silicone-modified acrylic emulsion at 25° C. is 1500-6000 mPa·s.

4. The coating material according to claim 3, characterized in that The wetting agent includes polyether-modified silicones.

5. The coating material according to claim 4, characterized in that The slip agent comprises wax emulsion and silicone emulsion, and the weight ratio of the wax emulsion to the silicone emulsion is 1:(1-9).

6. The coating material according to claim 5, characterized in that The average particle size of the matting powder is 2-10 microns.

7. The coating material according to claim 6, characterized in that The matting powder includes silicon dioxide and / or talc.

8. The coating material according to claim 1 or 6, characterized in that: Selected rheology modifiers include alkali swellable acrylics and / or cellulosics.

9. A method for preparing a coating material according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, adding matting powder, dispersant and defoaming agent into deionized water, stirring evenly to obtain a mixture; S2, adding the resin emulsion, wetting agent, slip agent, functional agent and rheological agent into the mixture, stirring evenly to obtain.

10. A use of the coating material according to any one of claims 1 to 7, characterized in that: The invention is applied to the dipping process of nitrile gloves, wherein the coagulant system of the dipping process contains 0.5-1.5wt% of a release agent.

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