Butyronitrile frosted glove and preparation method thereof

Abstract

The invention provides butyronitrile frosted gloves and a preparation method thereof. The butyronitrile slurry adopted by the butyronitrile frosted gloves is prepared from the following components in parts by weight: 100 parts of butyronitrile rubber, 5-20 parts of water-based PU (Polyurethane), 3-6 parts of composite foaming powder, 8-20 parts of water, 0.7-5 parts of a dispersing agent, 0.2-1.5 parts of a foaming aid and 0.3-2 parts of a thickening agent, wherein the butadiene-acrylonitrile rubber comprises natural butadiene-acrylonitrile rubber and carboxyl-terminated butadiene-acrylonitrile rubber in a weight ratio of (30: 70)-(50: 50). The high-performance butyronitrile frosted glove can be prepared by optimizing the butyronitrile slurry adopted for gum dipping and matching with the step of high-temperature drying without the step of salt spraying, and the wear resistance of the glove can reach 8000 revolutions or above, the wear resistance grade can reach grade 4, and the cutting resistance grade can reach grade A3 or above in the American standard according to the test of EN388: 2016.

Description

Technical Field

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

[0002] Frosted gloves are gloves with high friction and are commonly used as protective gloves for labor in special labor situations such as coal mining operations and the handling of steel and building materials. Currently, commercially available frosted gloves are mainly latex frosted, nitrile frosted, or PVC frosted. Although nitrile frosted gloves have outstanding advantages, they also have many problems that cannot be ignored. For example, the preparation process of frosted gloves requires spraying a large amount of inorganic salt (sodium chloride or sodium sulfate) on the surface of the glove rubber layer that has not yet fully solidified, and then repeatedly rinsing or soaking with water. For example, in the preparation of nitrile frosted gloves disclosed in patent documents CN106835721A, CN113563648A, CN109457465A, and CN117700780A, salt spraying is required. Salt spraying not only makes the workshop air susceptible to dust pollution and consumes a large amount of water resources, but the spilled salt, such as sodium chloride and sodium sulfate, can corrode metal pipes and metal equipment, accelerating equipment damage and indirectly increasing the company's production costs.

[0003] Based on this, a high-performance preparation process for nitrile frosted gloves that does not require salt spraying was developed. On the one hand, it meets the requirements of green environmental protection, and on the other hand, it can simplify the process and reduce production costs. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a nitrile scrub glove and a preparation method thereof.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a nitrile slurry comprising the following components in parts by weight: 100 parts of nitrile rubber, 5-20 parts of water-based PU, 3-6 parts of composite foaming powder, 8-20 parts of water, 0.7-5 parts of dispersant, 0.2-1.5 parts of foaming aid, and 0.3-2 parts of thickener;

[0007] The nitrile rubber comprises natural nitrile rubber and carboxyl-terminated nitrile rubber in a weight ratio of 30:70 to 50:50.

[0008] As a preferred embodiment, the composite foaming powder is a mixture of small-particle foaming powder and large-particle foaming powder. By combining small-particle foaming powder and large-particle foaming powder, the present invention achieves a frosted feel to the gloves after the foamed mixture breaks down, which is softer than the frosted feel produced by the salt spraying process. This not only saves costs and shortens the process, but also provides superior wear resistance and cutting performance.

[0009] As a further preferred solution, the particle size range of the small-particle foaming powder is 3 to 5 μm, and the particle size range of the small-particle foaming powder is 8 to 12 μm.

[0010] As a further preferred embodiment, the mixing mass ratio of the small-particle foaming powder to the large-particle foaming powder is 55:45 to 70:30.

[0011] As a further preferred embodiment, the small-particle foaming powder is azodicarbonamide, and the large-particle foaming powder is diisopropyl azodicarboxylate.

[0012] As a preferred embodiment, the dispersant is at least one of polyvinyl pyrrolidone, sodium methylene bisnaphthalene sulfonate, and sodium lignin sulfonate.

[0013] As a preferred embodiment, the foaming aid is at least one of silicone polyether emulsion, fatty alcohol, and fatty acid.

[0014] As a preferred embodiment, the thickener is at least one of carboxymethyl cellulose, sodium polyacrylate, and cellulose gum.

[0015] As a preferred embodiment, the components of the nitrile slurry further include a pH regulator and a color paste.

[0016] As a preferred solution, the amount of the color paste added is 1 to 5 parts by weight.

[0017] As a further preferred embodiment, the color paste is selected from any one of titanium dioxide, carbon black or other pigment pastes. The present invention does not impose any particular limitation thereto, and the type of color paste to be added can be selected accordingly based on the color that the gloves need to present.

[0018] As a further preferred embodiment, the amount of the pH regulator is an amount required to adjust the pH of the butyronitrile slurry to 7.5-10.

[0019] As a further preferred embodiment, the pH regulator is selected from hydroxides, such as sodium hydroxide, etc. The present invention does not make any special limitation, and any one or more pH regulators that can adjust the pH value to the desired range can be used.

[0020] As a preferred solution, the viscosity of the nitrile slurry is 500-3000 mPa·s.

[0021] In a second aspect, the present invention provides a method for preparing the aforementioned butyronitrile slurry, comprising the following steps:

[0022] Mix the nitrile rubber and water-based PU, stir evenly, adjust the slurry pH to 7.5-10, then add composite foaming powder, water, foaming aid, dispersant, color paste and thickener, stir and foam for 1-5 hours to obtain the nitrile slurry.

[0023] In a third aspect, the present invention provides a method for preparing nitrile scrub gloves, comprising the following steps:

[0024] The glove blank is put on the hand mold and preheated, and then sequentially subjected to a coagulant dipping treatment, a glue dipping treatment, a glue leveling treatment, a pre-vulcanization treatment, and a vulcanization treatment; finally, the glove blank is cooled and demoulded to obtain the nitrile frosted gloves;

[0025] Wherein, the slurry used in the dipping treatment is the aforementioned nitrile slurry;

[0026] No salt spraying is performed in the method.

[0027] As a preferred embodiment, the preheating temperature is 45-75°C;

[0028] The time for the dipping coagulant treatment, the dipping glue treatment, and the leveling glue treatment is 30-65 seconds respectively;

[0029] The coagulant is any one of calcium nitrate, acetic acid, carbonic acid, zinc chloride, calcium chloride, or a mixture thereof with alcohol; the glove blank is knitted using one or more of Johnson & Johnson PE fiber, nylon fiber, polyester fiber, and spandex fiber using a 13-needle, 15-needle, 18-needle, or 21-needle process.

[0030] As a preferred solution, the pre-sulfurization treatment conditions are: pre-sulfurization at 70-100° C. for 10-30 minutes.

[0031] As a preferred solution, the vulcanization treatment conditions are: vulcanization at 80-120°C for 10-30 minutes and vulcanization at 130-140°C for 20-50 minutes.

[0032] In a third aspect, the present invention provides a nitrile scrub glove prepared according to the aforementioned method.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1) The present invention optimizes the nitrile slurry used for dipping and combines it with a high-temperature drying step to prepare a high-performance nitrile frosted glove. The wear resistance of the glove tested by EN388:2016 can reach more than 8000 revolutions, the wear resistance level can reach level 4, and the cut resistance level can reach American standard A3 or above.

[0035] 2) In the method for preparing nitrile scrub gloves of the present invention, no salt spraying step is required, which meets environmental protection requirements, simplifies the process steps and greatly reduces the production cost, and has very good application prospects. DETAILED DESCRIPTION

[0036] Unless otherwise defined, technical or scientific terms used in this specification and claims shall have the ordinary meaning as understood by persons having ordinary skill in the art to which this application belongs. All numerical values listed herein, from the lowest value to the highest value, refer to all numerical values obtained by incrementing the lowest value to the highest value by one unit when the difference between the lowest value and the highest value is two units or more.

[0037] The following describes specific embodiments of the present application. It should be noted that, in the specific description of these embodiments, for the sake of brevity, this specification cannot provide a detailed description of all features of the actual embodiments. Without departing from the spirit and scope of this application, those skilled in the art may modify and replace the embodiments of this application, and the resulting embodiments are also within the scope of protection of this application.

[0038] Example

[0039] The embodiments of the present application will be described in detail below. This embodiment is implemented based on the technical solution of the present application, and a detailed implementation method and specific operation process are given, but the scope of protection of the present application is not limited to the following embodiments.

[0040] The equipment used in the specific embodiments of the present invention are all conventional equipment for producing gloves, and the raw materials used are also prepared or purchased using conventional methods, and the present invention does not impose any particular limitations thereon.

[0041] Example 1

[0042] This embodiment provides a method for preparing nitrile scrub gloves, comprising the following steps:

[0043] 1) Glove blank preparation: Polyester and spandex blended yarn is used to knit a 15-gauge knitted glove blank;

[0044] 2) Preparation of composite foaming powder: 4 parts of small-particle foaming powder (azodicarbonamide, purchased from Jinan Yeqing Biotechnology Co., Ltd., model AC, with a particle size of 3-5 μm) and 2 parts of large-particle foaming powder (diisopropyl azodicarboxylate, purchased from Jinan Yeqing Biotechnology Co., Ltd., model H, with a particle size of 8-12 μm) were mixed uniformly to obtain composite foaming powder;

[0045] 3) Preparation of nitrile slurry: 50 parts of natural nitrile rubber (purchased from Shanghai Zhuzi New Materials Co., Ltd.), 50 parts of carboxyl-terminated nitrile rubber (purchased from Shanghai Zhuzi New Materials Co., Ltd.), and 10 parts of water-based PU (purchased from Shanghai Zhuzi New Materials Co., Ltd.) were mixed and stirred evenly, and a 10% mass fraction of sodium hydroxide solution was added to adjust the pH to 8.5; then the composite foaming powder prepared in step 2) was added, and then 10 parts of water, 1 part of silicone resin polyether emulsion (purchased from Shandong Fengtai Biotechnology Co., Ltd.), 3 parts of dispersant (sodium methylene bisnaphthalene sulfonate, purchased from Shandong Fengtai Biotechnology Co., Ltd.), 2 parts of titanium dioxide (purchased from Shandong Fengtai Biotechnology Co., Ltd.) and 1 part of carboxymethyl cellulose (purchased from Shandong Fengtai Biotechnology Co., Ltd.) were added, and mechanically stirred and foamed for 3 hours to obtain a nitrile slurry, and its viscosity was measured to be 2300 mPa·s (the viscosity test method used was a rotational viscometer test, and the test temperature was 25°C);

[0046] 4) Mold fitting and preheating: The glove blank prepared in step 1) is fitted onto the hand mold and then heated to 55° C.

[0047] 5) Coagulant Dipping Treatment: Immerse the preheated glove blank in a coagulant (a mixture of calcium nitrate and ethanol at a mass ratio of 4:96) for 50 seconds;

[0048] 6) Dipping: Dip the glove blank treated in step 5) into the nitrile slurry prepared in step 3) for 60 seconds;

[0049] 7) Glueing treatment: Glue the glove blank treated in step 6) for 30 seconds;

[0050] 8) Pre-vulcanization treatment: Dry the glove blank treated in step 7) at 80°C for 20 minutes;

[0051] 9) Vulcanization treatment: The glove blank treated in step 8) is vulcanized at 90° C. for 20 min and 135° C. for 40 min, followed by cooling and demolding to obtain the nitrile frosted gloves.

[0052] Example 2

[0053] This embodiment provides a method for preparing nitrile scrub gloves, comprising the following steps:

[0054] 1) Glove blank preparation: Polyester and spandex blended yarn is used to knit a 15-gauge knitted glove blank;

[0055] 2) Preparation of composite foaming powder: 3.5 parts of small-particle foaming powder (azodicarbonamide, purchased from Jinan Yeqing Biotechnology Co., Ltd., model AC, with a particle size of 3-5 μm) and 1.5 parts of large-particle foaming powder (diisopropyl azodicarboxylate, purchased from Jinan Yeqing Biotechnology Co., Ltd., model H, with a particle size of 8-12 μm) were mixed uniformly to obtain composite foaming powder;

[0056] 3) Preparation of nitrile slurry: 40 parts of natural nitrile rubber (purchased from Shanghai Zhuzi New Materials Co., Ltd.), 60 parts of carboxyl-terminated nitrile rubber (purchased from Shanghai Zhuzi New Materials Co., Ltd.), and 5 parts of water-based PU (purchased from Shanghai Zhuzi New Materials Co., Ltd.) were mixed and stirred evenly, and a 10% mass fraction of sodium hydroxide solution was added to adjust the pH to 7.5; then the composite foaming powder prepared in step 2) was added, and then 15 parts of water, 0.5 parts of silicone resin polyether emulsion (purchased from Shandong Fengtai Biotechnology Co., Ltd.), 1 part of dispersant (sodium methylene bisnaphthalene sulfonate, purchased from Shandong Fengtai Biotechnology Co., Ltd.), 3 parts of titanium dioxide (purchased from Shandong Fengtai Biotechnology Co., Ltd.) and 0.5 parts of carboxymethyl cellulose (purchased from Shandong Fengtai Biotechnology Co., Ltd.) were added, and mechanically stirred and foamed for 5 hours to obtain a nitrile slurry, and its viscosity was measured to be 500mPa·s (the viscosity test method used was a rotational viscometer test, and the test temperature was 25°C);

[0057] 4) Mold fitting and preheating: The glove blank prepared in step 1) is fitted onto the hand mold and then heated to 65° C.

[0058] 5) Coagulant Dipping Treatment: Immerse the preheated glove blank in a coagulant (a mixture of calcium nitrate and ethanol at a mass ratio of 4:96) for 30 seconds;

[0059] 6) Dipping: Dip the glove blank treated in step 5) into the nitrile slurry prepared in step 3) for 40 seconds;

[0060] 7) Glue Spreading: The glove blank treated in step 6) is subjected to glue spreading for 60 seconds;

[0061] 8) Pre-vulcanization treatment: drying the glove blanks treated in step 7) at 100°C for 10 minutes;

[0062] 9) Vulcanization treatment: The glove blank treated in step 8) is vulcanized at 110° C. for 15 minutes and then at 140° C. for 20 minutes, followed by cooling and demolding to obtain the nitrile frosted gloves.

[0063] Example 3

[0064] This embodiment provides a method for preparing nitrile scrub gloves, comprising the following steps:

[0065] 1) Glove blank preparation: Polyester and spandex blended yarn is used to knit a 15-gauge knitted glove blank;

[0066] 2) Preparation of composite foaming powder: 1.5 parts of small-particle foaming powder (azodicarbonamide, purchased from Jinan Yeqing Biotechnology Co., Ltd., model AC, particle size 3-5 μm) and 1.5 parts of large-particle foaming powder (diisopropyl azodicarboxylate, purchased from Jinan Yeqing Biotechnology Co., Ltd., model H, particle size 8-12 μm) were mixed uniformly to obtain composite foaming powder;

[0067] 3) Preparation of nitrile slurry: 30 parts of natural nitrile rubber (purchased from Shanghai Zhuzi New Materials Co., Ltd.), 70 parts of carboxyl-terminated nitrile rubber (purchased from Shanghai Zhuzi New Materials Co., Ltd.), and 20 parts of water-based PU (purchased from Shanghai Zhuzi New Materials Co., Ltd.) were mixed and stirred evenly, and a 10% mass fraction of sodium hydroxide solution was added to adjust the pH to 9.0; then the composite foaming powder prepared in step 2) was added, and then 8 parts of water, 1.5 parts of silicone resin polyether emulsion (purchased from Shandong Fengtai Biotechnology Co., Ltd.), 4 parts of dispersant (sodium methylene bisnaphthalene sulfonate, purchased from Shandong Fengtai Biotechnology Co., Ltd.), 3 parts of titanium dioxide (purchased from Shandong Fengtai Biotechnology Co., Ltd.) and 0.3 parts of carboxymethyl cellulose (purchased from Shandong Fengtai Biotechnology Co., Ltd.) were added, and mechanically stirred and foamed for 2 hours to obtain a nitrile slurry, and its viscosity was measured to be 1500 mPa·s (the viscosity test method used was a rotational viscometer test, and the test temperature was 25°C);

[0068] 4) Mold fitting and preheating: The glove blank prepared in step 1) is fitted onto the hand mold and then heated to 55° C.

[0069] 5) Coagulant Dipping Treatment: Immerse the preheated glove blank in a coagulant (a mixture of calcium nitrate and ethanol at a mass ratio of 4:96) for 60 seconds;

[0070] 6) Dipping: Dip the glove blank treated in step 5) into the nitrile slurry prepared in step 3) for 60 seconds;

[0071] 7) Glueing treatment: Glue the glove blank treated in step 6) for 50 seconds;

[0072] 8) Pre-vulcanization treatment: Dry the glove blank treated in step 7) at 70°C for 30 minutes;

[0073] 9) Vulcanization treatment: The glove blank treated in step 8) is vulcanized at 80° C. for 30 min and 130° C. for 50 min, followed by cooling and demolding to obtain the nitrile frosted gloves.

[0074] Example 4

[0075] This embodiment provides a method for preparing nitrile scrub gloves, comprising the following steps:

[0076] 1) Glove blank preparation: Polyester and spandex blended yarn is used to knit a 15-gauge knitted glove blank;

[0077] 2) Preparation of composite foaming powder: 2.2 parts of small-particle foaming powder (azodicarbonamide, purchased from Jinan Yeqing Biotechnology Co., Ltd., model AC, particle size 3-5 μm) and 1.8 parts of large-particle foaming powder (diisopropyl azodicarboxylate, purchased from Jinan Yeqing Biotechnology Co., Ltd., model H, particle size 8-12 μm) were mixed uniformly to obtain composite foaming powder;

[0078] 3) Preparation of nitrile slurry: 50 parts of natural nitrile rubber (purchased from Shanghai Zhuzi New Materials Co., Ltd.), 50 parts of carboxyl-terminated nitrile rubber (purchased from Shanghai Zhuzi New Materials Co., Ltd.), and 15 parts of water-based PU (purchased from Shanghai Zhuzi New Materials Co., Ltd.) were mixed and stirred evenly, and a 10% mass fraction of sodium hydroxide solution was added to adjust the pH to 8.0; then the composite foaming powder prepared in step 2) was added, and then 12 parts of water, 0.2 parts of silicone resin polyether emulsion (purchased from Shandong Fengtai Biotechnology Co., Ltd.), 0.7 parts of dispersant (sodium methylene bisnaphthalene sulfonate, purchased from Shandong Fengtai Biotechnology Co., Ltd.), 5 parts of titanium dioxide (purchased from Shandong Fengtai Biotechnology Co., Ltd.) and 2 parts of carboxymethyl cellulose (purchased from Shandong Fengtai Biotechnology Co., Ltd.) were added, and mechanically stirred and foamed for 4 hours to obtain a nitrile slurry, and its viscosity was measured to be 3000 mPa·s (the viscosity test method used was a rotational viscometer test, and the test temperature was 25°C);

[0079] 4) Mold fitting and preheating: The glove blank prepared in step 1) is fitted onto the hand mold and then heated to 75° C.

[0080] 5) Coagulant Dipping Treatment: Immerse the preheated glove blank in a coagulant (a mixture of calcium nitrate and ethanol at a mass ratio of 4:96) for 45 seconds;

[0081] 6) Dipping: Dip the glove blank treated in step 5) into the nitrile slurry prepared in step 3) for 45 seconds;

[0082] 7) Glue Spreading: The glove blank treated in step 6) is subjected to glue spreading for 65 seconds;

[0083] 8) Pre-vulcanization treatment: Dry the glove blank treated in step 7) at 90°C for 20 minutes;

[0084] 9) Vulcanization treatment: The glove blank treated in step 8) is vulcanized at 120° C. for 10 min and 135° C. for 30 min, followed by cooling and demolding to obtain the nitrile frosted gloves.

[0085] Example 5

[0086] This embodiment provides a method for preparing nitrile scrub gloves, which is basically the same as the preparation method in Example 1, except that: in this embodiment, step 2) the composite foaming powder is prepared by mixing 2 parts of small-particle foaming powder (azodicarbonamide, purchased from Jinan Yeqing Biotechnology Co., Ltd., model AC, with a particle size of 3-5 μm) and 4 parts of large-particle foaming powder (diisopropyl azodicarboxylate, purchased from Jinan Yeqing Biotechnology Co., Ltd., model H, with a particle size of 8-12 μm) to obtain a composite foaming powder.

[0087] Example 6

[0088] This embodiment provides a method for preparing nitrile scrub gloves, which is basically the same as the preparation method of Example 4, except that: in this embodiment, step 2) the composite foaming powder is prepared as follows: 3 parts of small-particle foaming powder (azodicarbonamide, purchased from Jinan Yeqing Biotechnology Co., Ltd., model AC, particle size 3-5 μm) and 1 part of large-particle foaming powder (diisopropyl azodicarboxylate, purchased from Jinan Yeqing Biotechnology Co., Ltd., model H, particle size 8-12 μm) are mixed uniformly to obtain the composite foaming powder.

[0089] Comparative Example 1

[0090] This comparative example provides a method for preparing nitrile scrub gloves, which is basically the same as the preparation method in Example 1, except that: in this comparative example, step 2) the composite foaming powder is prepared as follows: 6 parts of small-particle foaming powder (azodicarbonamide, purchased from Jinan Yeqing Biotechnology Co., Ltd., model AC, particle size 3-5 μm) and 0 parts of large-particle foaming powder (diisopropyl azodicarboxylate, purchased from Jinan Yeqing Biotechnology Co., Ltd., model H, particle size 8-12 μm) are mixed uniformly to obtain a composite foaming powder.

[0091] Comparative Example 2

[0092] This comparative example provides a method for preparing nitrile scrub gloves, which is basically the same as the preparation method in Example 1, except that: in this comparative example, step 2) the composite foaming powder is prepared as follows: 0 parts of small-particle foaming powder (azodicarbonamide, purchased from Jinan Yeqing Biotechnology Co., Ltd., model AC, particle size 3-5 μm) and 6 parts of large-particle foaming powder (diisopropyl azodicarboxylate, purchased from Jinan Yeqing Biotechnology Co., Ltd., model H, particle size 8-12 μm) are mixed evenly to obtain a composite foaming powder.

[0093] Comparative Example 3

[0094] This comparative example provides a method for preparing nitrile scrub gloves, which is basically the same as the preparation method in Example 3, except that: in this comparative example, 20 parts of natural nitrile rubber and 80 parts of carboxyl-terminated nitrile rubber are used in the preparation of the nitrile slurry in step 3).

[0095] Comparative Example 4

[0096] This comparative example provides a method for preparing nitrile scrub gloves, which is basically the same as the preparation method in Example 3, except that: in this comparative example, 60 parts of natural nitrile rubber and 40 parts of carboxyl-terminated nitrile rubber are used in the preparation of the nitrile slurry in step 3).

[0097] Comparative Example 5

[0098] This comparative example provides a method for preparing nitrile frosted gloves, which is basically the same as the preparation method in Example 4, except that: in this comparative example, the vulcanization treatment in step 8) is as follows: the glove blank treated in step 7) is vulcanized at 120°C for 40 minutes, then cooled and demolded to obtain the nitrile frosted gloves.

[0099] Comparative Example 6

[0100] This comparative example provides a method for preparing nitrile frosted gloves, which is basically the same as the preparation method in Example 4, except that: in this comparative example, the vulcanization treatment in step 8) is as follows: the glove blank treated in step 7) is vulcanized at 135°C for 40 minutes, then cooled and demolded to obtain the nitrile frosted gloves.

[0101] Comparative Example 7

[0102] This comparative example provides a method for preparing nitrile frosted gloves, which is basically the same as the preparation method in Example 2, except that: in this comparative example, the vulcanization treatment in step 8) is as follows: the glove blank treated in step 7) is vulcanized at 110°C for 15 minutes and 125°C for 20 minutes, followed by cooling and demolding to obtain the nitrile frosted gloves.

[0103] Performance Testing

[0104] The PVC frosted gloves prepared in each example were tested for wear resistance and tear resistance. The wear resistance test was performed using the EN388:2016 method, and the tear resistance test was performed using the ASTM standard. The test results are shown in Table 1 below.

[0105] Table 1

[0106]

[0107] From the performance test results in Table 1, it can be seen that the wear resistance grade of the nitrile frosted gloves prepared in Examples 1-6 reaches grade 3-4 and the wear resistance revolution number reaches more than 7200 revolutions, the tear resistance grade reaches American standard A2-A3, and the appearance of the frosted surface of the prepared gloves is good.

[0108] Comparison of the results of Example 1 with Comparative Examples 1-2 shows that the use of only a single small-particle foaming powder or a single large-particle foaming powder significantly reduces wear resistance and tear resistance. Furthermore, comparison of the results of Example 1 with Example 5, and of Example 4 with Example 6, shows that a ratio outside the range of 55:45 to 70:30 for small-particle foaming powder to large-particle foaming powder also significantly reduces wear resistance and tear resistance.

[0109] From the comparison of the results of Example 3 and Comparative Examples 3-4, it can be seen that when the compounding ratio of natural nitrile rubber and end-carboxyl nitrile rubber is not within the range of 30:70 to 50:50, it will also lead to a significant decrease in wear resistance and / or tear resistance.

[0110] Comparing the results of Example 4 with Comparative Examples 5-6, it can be seen that gloves prepared using only a vulcanization temperature of 120°C cannot effectively break down the composite foaming powder, resulting in a poor frosted surface appearance and deteriorating wear and tear resistance. Gloves prepared using only a vulcanization temperature of 135°C have a good frosted surface appearance, but deteriorate wear and tear resistance. Comparing the results of Example 2 with Comparative Example 7, it can be seen that using a vulcanization temperature that is too low in the second step still results in a poor frosted surface appearance and deteriorated wear resistance.

[0111] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A nitrile slurry, characterized in that The invention comprises the following components in parts by weight: 100 parts of nitrile rubber, 5-20 parts of water-based PU, 3-6 parts of composite foaming powder, 8-20 parts of water, 0.7-5 parts of dispersant, 0.2-1.5 parts of foaming aid, and 0.3-2 parts of thickener; The nitrile rubber comprises natural nitrile rubber and carboxyl-terminated nitrile rubber in a weight ratio of 30:70 to 50:

50.

2. The nitrile slurry according to claim 1, wherein The composite foaming powder is a mixture of small-particle foaming powder and large-particle foaming powder; The particle size range of the small-particle foaming powder is 3 to 5 μm, and the particle size range of the small-particle foaming powder is 8 to 12 μm; The mixing mass ratio of the small-particle foaming powder to the large-particle foaming powder is 55:45 to 70:

30.

3. The nitrile slurry according to claim 1, wherein The dispersant is at least one of polyvinyl pyrrolidone, sodium methylene bisnaphthalene sulfonate, and sodium lignin sulfonate; The foaming aid is at least one of silicone polyether emulsion, fatty alcohol, and fatty acid; The thickener is at least one of carboxymethyl cellulose, sodium polyacrylate, and cellulose gum.

4. The nitrile slurry according to claim 1, wherein The components of the nitrile slurry also include a pH regulator and a color paste; The amount of the pH regulator is the amount required to adjust the pH of the nitrile slurry to 7.5-10; The added weight of the color paste is 1 to 5 parts.

5. The nitrile slurry according to claim 1, wherein The viscosity of the nitrile slurry is 500-3000 mPa·s.

6. A method for preparing a butyronitrile slurry according to any one of claims 1 to 5, characterized in that: The following steps are involved: Mix the nitrile rubber and water-based PU, stir evenly, adjust the slurry pH to 7.5-10, then add composite foaming powder, water, foaming aid, dispersant, color paste and thickener, stir and foam for 1-5 hours to obtain the nitrile slurry.

7. A method for preparing nitrile frosted gloves, characterized in that: The following steps are involved: The glove blank is put on the hand mold and preheated, and then sequentially subjected to a coagulant dipping treatment, a glue dipping treatment, a glue leveling treatment, a pre-vulcanization treatment, and a vulcanization treatment; finally, the glove blank is cooled and demoulded to obtain the nitrile frosted gloves; Wherein, the slurry used in the dipping treatment is the nitrile slurry according to any one of claims 1 to 5; No salt spraying is performed in the method.

8. The method for preparing nitrile scrub gloves according to claim 7, characterized in that: The preheating temperature is 45-75°C; The time for the dipping coagulant treatment, the dipping glue treatment, and the leveling glue treatment is 30-65 seconds respectively; The coagulant is any one of calcium nitrate, acetic acid, carbonic acid, zinc chloride, calcium chloride, or a mixture thereof with alcohol; the glove blank is knitted using one or more of Johnson & Johnson PE fiber, nylon fiber, polyester fiber, and spandex fiber using a 13-needle, 15-needle, 18-needle, or 21-needle process.

9. The method for preparing nitrile scrub gloves according to claim 7, characterized in that: The pre-sulfurization treatment conditions are: pre-sulfurization at 70-100°C for 10-30 minutes; The vulcanization treatment conditions are: vulcanization at 80-120° C. for 10-30 minutes and vulcanization at 130-140° C. for 20-50 minutes.

10. A nitrile scrub glove prepared according to the method according to any one of claims 7 to 9.

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