High-strength rubber material for butyronitrile gloves and production process of high-strength rubber material

Abstract

The invention relates to the technical field of rubber materials, and provides a high-strength rubber material for butyronitrile gloves and a production process of the high-strength rubber material. The high-strength rubber material for the butyronitrile gloves comprises the following components in parts by weight: 120 parts of modified butyronitrile latex, 2-4 parts of a vulcanizing agent, 0.3-0.8 part of an accelerant, 1-3 parts of titanium dioxide, 1-2 parts of an anti-aging agent, 1-4 parts of a surfactant and 150 parts of water, the modified butyronitrile latex is obtained by modifying butyronitrile latex through a modifier; the weight ratio of the butyronitrile latex to the modifier is 100: (4-8); the modifier comprises light calcium carbonate and cellulose acetate butyrate in a weight ratio of (1: 9)-(9: 1); the butyronitrile latex comprises carboxyl butyronitrile latex. According to the technical scheme, the problems of poor tensile property and poor aging resistance of the rubber material for the butyronitrile gloves in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber materials, and in particular to a high-strength rubber material for nitrile gloves and a production process thereof. Background Art

[0002] Nitrile gloves are protective gloves made of nitrile rubber materials, which are widely used in medical and health care, food processing, chemical protection, petrochemical industry, etc. Nitrile gloves are mainly made of nitrile rubber materials, which are synthetic rubber materials made from butadiene and acrylonitrile by emulsion polymerization. The rubber materials currently used have weak resistance to ozone, and long-term exposure to ozone environment may cause cracks or aging on the surface of the gloves. In addition, the tensile properties of rubber materials used for nitrile gloves are limited. In some extreme cases, such as encountering strong tearing or other external forces, the gloves will break to a large extent and cannot provide sufficient protection for the hands. Therefore, a high-strength rubber material for nitrile gloves is developed, which has good tensile properties and good aging resistance, which is of great significance for improving the use effect and safety of nitrile rubber gloves. Summary of the invention

[0003] The present invention provides a high-strength rubber material for nitrile gloves and a production process thereof, which solves the problems of poor tensile properties and poor aging resistance of the rubber material for nitrile gloves in the related art.

[0004] The technical solution of the present invention is as follows: The present invention provides a high-strength rubber material for nitrile gloves, comprising the following components in parts by weight: 120 parts of modified nitrile latex, 2-4 parts of vulcanizing agent, 0.3-0.8 parts of accelerator, 1-3 parts of titanium dioxide, 1-2 parts of anti-aging agent, 1-4 parts of surfactant, 150 parts of water; The modified nitrile latex is obtained by modifying the nitrile latex with a modifier; The weight ratio of the nitrile latex to the modifier is 100:4-8; The modifier comprises light calcium carbonate and cellulose acetate butyrate in a weight ratio of 1:9 to 9:1; The nitrile latex includes carboxyl nitrile latex.

[0005] As a further technical solution, the weight ratio of the light calcium carbonate to cellulose acetate butyrate is 1~3:1.

[0006] When the weight ratio of light calcium carbonate to cellulose acetate butyrate is 1-3:1, the tensile properties and aging resistance of the high-strength rubber material for nitrile gloves can be further improved.

[0007] As a further technical solution, the preparation method of the modified nitrile latex comprises the following steps: adding a dispersant to the modifier, ball milling once, adding the nitrile latex, ball milling twice, to obtain the modified nitrile latex; The weight ratio of the modifier to the dispersant is 10:0.5.

[0008] As a further technical solution, during the first ball milling, the rotation speed is 150-200 r / min and the time is 10-30 min; during the second ball milling, the rotation speed is 200-260 r / min and the time is 60-80 min.

[0009] As a further technical solution, the modifier also includes ethylene-vinyl acetate copolymer.

[0010] In the present invention, the inventors found that when the modifier also includes ethylene-vinyl acetate copolymer, the tensile properties and aging resistance of the high-strength rubber material for nitrile gloves can be further improved by using light calcium carbonate, cellulose acetate butyrate and ethylene-vinyl acetate copolymer to modify the nitrile latex. The reason may be that when ethylene-vinyl acetate copolymer exists, the agglomeration of light calcium carbonate and cellulose acetate butyrate in the nitrile latex can be reduced, and the dispersion of light calcium carbonate and cellulose acetate butyrate in the nitrile latex and the interaction with the nitrile latex matrix can be improved, thereby further improving the tensile properties and aging resistance of the high-strength rubber material for nitrile gloves.

[0011] As a further technical solution, in the modifier, the weight ratio of the light calcium carbonate to the cellulose acetate butyrate and to the ethylene-vinyl acetate copolymer is 4-7:1.

[0012] When the weight ratio of light calcium carbonate to cellulose acetate butyrate and to ethylene-vinyl acetate copolymer is 4-7:1, the tensile properties and aging resistance of the high-strength rubber material for nitrile gloves can be further improved.

[0013] As a further technical solution, the preparation method of the modified nitrile latex comprises the following steps: A1. After melting the ethylene-vinyl acetate copolymer, add the light calcium carbonate and the cellulose acetate butyrate, mix them evenly, and obtain a mixed modifier; A2, adding dispersant to the mixed modifier, ball milling once, adding the nitrile latex, ball milling twice, to obtain the modified nitrile rubber; The weight ratio of the mixed modifier to the dispersant is 10:0.5.

[0014] As a further technical solution, in step A1, the temperature during melting is 85-95°C.

[0015] As a further technical solution, in step A2, during the first ball milling, the rotation speed is 150-200 r / min, and the time is 10-30 min; in step A2, during the second ball milling, the rotation speed is 200-260 r / min, and the time is 60-80 min.

[0016] As a further technical solution, the dispersants are independently one or two of alkylphenol polyoxyethylene ether and ethylene stearic acid amide.

[0017] As a further technical solution, the nitrile latex also includes ordinary nitrile latex.

[0018] As a further technical solution, the weight ratio of the carboxyl nitrile latex to the ordinary nitrile latex is 1~4:1.

[0019] As a further technical solution, the vulcanizing agent includes one or two of sulfur and dicumyl peroxide.

[0020] As a further technical solution, the accelerator includes one or more of accelerator NA-22, accelerator BZ, and accelerator TP.

[0021] As a further technical solution, the surfactant includes one or both of polyvinyl alcohol and sodium lauryl sulfate.

[0022] As a further technical solution, the anti-aging agent includes one or more of anti-aging agent 4010NA, anti-aging agent 2246, and anti-aging agent D.

[0023] The present invention also proposes a production process of the high-strength rubber material for nitrile gloves, comprising the following steps: S1, mixing an accelerator, titanium dioxide, an anti-aging agent, a surfactant and water, and stirring to obtain a mixture; S2, adding the modified nitrile latex and the vulcanizing agent into the mixture, mixing, stirring, and vulcanizing to obtain the high-strength rubber material for nitrile gloves. As a further technical solution, in step S1, during the stirring, the temperature is 45-55°C, the stirring time is 50-70 min, and the stirring speed is 300-400 r / min.

[0024] As a further technical solution, in step S2, during the stirring, the temperature is 55-65°C, the stirring time is 80-100 min, and the stirring speed is 500-600 r / min; during the vulcanization, the temperature is 110-130°C, and the vulcanization time is 15-24 min.

[0025] The working principle and beneficial effects of the present invention are: In the present invention, a high-strength rubber material for nitrile gloves can be prepared by using modified nitrile latex as the main base material under the action of a vulcanizing agent, an accelerator, titanium dioxide, an anti-aging agent, a surfactant and water, and the high-strength rubber material has good tensile properties and aging resistance. The modified nitrile latex is obtained by modifying the nitrile latex with a modifier, and when the modifier is light calcium carbonate and cellulose acetate butyrate, the light calcium carbonate and cellulose acetate butyrate can interact with the nitrile latex base material, and the nitrile latex is modified by light calcium carbonate and cellulose acetate butyrate, so that the structure of the nitrile latex is dense and stable, so that the prepared high-strength rubber material for nitrile gloves has good tensile properties and aging resistance. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0027] In the following embodiments and comparative examples, the model of carboxyl nitrile latex is SH-820; the model of ordinary nitrile latex is NBR-501; the particle size of titanium dioxide is 1250 mesh; the model of cellulose acetate butyrate is CAB-551-0.2; the particle size of light calcium carbonate is 1250 mesh; the model of alkylphenol polyoxyethylene ether is NP-10; and the model of ethylene-vinyl acetate copolymer is V961RC.

[0028] Example 1 A high-strength rubber material for nitrile gloves, comprising the following components in parts by weight: 120 parts of modified nitrile latex, 2 parts of sulfur, 0.3 parts of accelerator BZ, 1 part of titanium dioxide, 1 part of antioxidant 4010NA, 1 part of sodium lauryl sulfate, 150 parts of water; The preparation method of modified nitrile latex comprises the following steps: adding alkylphenol polyoxyethylene ether to 4 parts of a modifier consisting of 0.4 parts of light calcium carbonate and 3.6 parts of cellulose acetate butyrate, ball milling at 150 r / min for 10 minutes, adding 100 parts of carboxyl nitrile latex, ball milling at 200 r / min for 60 minutes, and obtaining the modified nitrile latex; wherein the weight ratio of the modifier to the alkylphenol polyoxyethylene ether is 10:0.5; A production process of high-strength rubber material for nitrile gloves comprises the following steps: S1. Mix accelerator BZ, titanium dioxide, antioxidant 4010NA, sodium lauryl sulfate and water, and stir at 45° C. at a stirring speed of 300 r / min for 70 min to obtain a mixture; S2. Add modified nitrile latex and sulfur to the mixture, mix, stir at 55° C. at a stirring speed of 500 r / min for 100 min, and vulcanize at 110° C. for 24 min to obtain a high-strength rubber material for nitrile gloves.

[0029] Example 2 A high-strength rubber material for nitrile gloves, comprising the following components in parts by weight: 120 parts of modified nitrile latex, 4 parts of sulfur, 0.8 parts of accelerator BZ, 3 parts of titanium dioxide, 2 parts of antioxidant 4010NA, 4 parts of sodium lauryl sulfate, 150 parts of water; The preparation method of modified nitrile latex comprises the following steps: adding alkylphenol polyoxyethylene ether to 8 parts of a modifier consisting of 7.2 parts of light calcium carbonate and 0.8 parts of cellulose acetate butyrate, ball milling at 200 r / min for 30 minutes, adding 100 parts of carboxyl nitrile latex, ball milling at 260 r / min for 80 minutes, and obtaining the modified nitrile latex; wherein the weight ratio of the modifier to the alkylphenol polyoxyethylene ether is 10:0.5; A production process of high-strength rubber material for nitrile gloves comprises the following steps: S1, mixing accelerator BZ, titanium dioxide, antioxidant 4010NA, sodium lauryl sulfate and water, stirring at 55° C. and a stirring speed of 400 r / min for 50 min to obtain a mixture; S2. Add modified nitrile latex and sulfur to the mixture, mix, stir at 65° C. at a stirring speed of 600 r / min for 80 min, and vulcanize at 130° C. for 15 min to obtain a high-strength rubber material for nitrile gloves.

[0030] Example 3 The only difference between this embodiment and embodiment 2 is that, in this embodiment, 3 parts of light calcium carbonate and 5 parts of cellulose acetate butyrate are added.

[0031] Example 4 The only difference between this embodiment and embodiment 2 is that, in this embodiment, 6 parts of light calcium carbonate and 2 parts of cellulose acetate butyrate are added.

[0032] Example 5 The only difference between this embodiment and embodiment 2 is that, in this embodiment, 4 parts of light calcium carbonate and 4 parts of cellulose acetate butyrate are added.

[0033] Example 6 The difference between this embodiment and embodiment 5 is that, in this embodiment, 2.5 parts of light calcium carbonate, 2.5 parts of cellulose acetate butyrate, and 3 parts of ethylene-vinyl acetate copolymer are added; The preparation method of modified nitrile latex comprises the following steps: A1. After melting 3 parts of ethylene-vinyl acetate copolymer at 90° C., add 2.5 parts of light calcium carbonate and 2.5 parts of cellulose acetate butyrate, mix well, and obtain a mixed modifier; A2. Add alkylphenol polyoxyethylene ether to the mixed modifier, ball mill for 20 minutes, add 100 parts of carboxyl nitrile latex, and ball mill for 70 minutes to obtain modified nitrile rubber; the weight ratio of the mixed modifier to the alkylphenol polyoxyethylene ether is 10:0.5.

[0034] Example 7 The only difference between this embodiment and embodiment 6 is that in this embodiment, 3.8 parts of light calcium carbonate, 3.8 parts of cellulose acetate butyrate, and 0.4 parts of ethylene-vinyl acetate copolymer are added.

[0035] Example 8 The only difference between this embodiment and embodiment 6 is that, in this embodiment, 3.2 parts of light calcium carbonate, 3.2 parts of cellulose acetate butyrate, and 1.6 parts of ethylene-vinyl acetate copolymer are added.

[0036] Example 9 The only difference between this embodiment and embodiment 6 is that in this embodiment, 3.5 parts of light calcium carbonate, 3.5 parts of cellulose acetate butyrate and 1 part of ethylene-vinyl acetate copolymer are added.

[0037] Example 10 The only difference between this embodiment and embodiment 9 is that in this embodiment, 100 parts of carboxylated nitrile latex are replaced by 50 parts of carboxylated nitrile latex and 50 parts of ordinary nitrile latex.

[0038] Embodiment 11 The only difference between this embodiment and embodiment 9 is that in this embodiment, 100 parts of carboxylated nitrile latex are replaced by 80 parts of carboxylated nitrile latex and 20 parts of ordinary nitrile latex.

[0039] Comparative Example 1 The difference between this comparative example and Example 1 is that in this comparative example, no light calcium carbonate is added, and 4 parts of cellulose acetate butyrate are added.

[0040] Comparative Example 2 The difference between this comparative example and Example 1 is that in this comparative example, cellulose acetate butyrate is not added, and 4 parts of light calcium carbonate are added.

[0041] Comparative Example 3 The difference between this comparative example and Example 1 is that in this comparative example, 0.4 parts of light calcium carbonate and 3.6 parts of cellulose acetate butyrate are replaced by 4 parts of ethylene-vinyl acetate copolymer; The preparation method of modified nitrile latex comprises the following steps: adding alkylphenol polyoxyethylene ether to 4 parts of ethylene-vinyl acetate copolymer, ball milling for 30 minutes, adding 100 parts of carboxyl nitrile latex, ball milling for 80 minutes, and obtaining modified nitrile latex; wherein the weight ratio of ethylene-vinyl acetate copolymer to alkylphenol polyoxyethylene ether is 10:0.5.

[0042] Comparative Example 4 The only difference between this comparative example and Example 1 is that in this comparative example, 120 parts of modified nitrile latex are replaced by an equal amount of carboxyl nitrile latex.

[0043] Experimental Example 1 Tensile Properties Test The high-strength rubber materials for nitrile gloves obtained in Examples 1 to 11 and Comparative Examples 1 to 4 were used as raw materials to prepare molded gloves. The tensile strength of the sliced ​​samples was tested according to ASTM D412 standard. The test results are shown in Table 1 below.

[0044] Experimental Example 2 Aging resistance test The high-strength rubber materials for nitrile gloves prepared in Examples 1 to 11 and Comparative Examples 1 to 4 were used as raw materials to prepare molded gloves. Slice samples were prepared according to the standard in ASTM D412. After the slice samples were aged at 70° C. for 168 h, the tensile strength test after the aging test was carried out according to the above-mentioned tensile strength test method. The test results are shown in Table 1 below.

[0045] Table 1 Performance test results of Examples 1 to 11 and Comparative Examples 1 to 4

[0046] It can be seen from Table 1 that compared with Comparative Examples 1 to 4, the tensile strength and tensile strength after aging of Example 1 are significantly improved, indicating that the modification of nitrile latex by light calcium carbonate and cellulose acetate butyrate can make the structure of nitrile latex dense and stable, so that the prepared high-strength rubber material for nitrile gloves has good tensile properties and aging resistance.

[0047] Compared with Examples 2 to 3, the tensile strength and tensile strength after aging of Examples 4 to 5 are improved, indicating that when the weight ratio of light calcium carbonate to cellulose acetate butyrate is 1 to 3:1, the tensile properties and aging resistance of the high-strength rubber material for nitrile gloves can be further improved.

[0048] Compared with Example 5, the tensile strength and tensile strength after aging of Examples 6 to 9 are improved, indicating that when the modifier also includes ethylene-vinyl acetate copolymer, the nitrile latex is modified by light calcium carbonate, cellulose acetate butyrate and ethylene-vinyl acetate copolymer, which can further improve the tensile properties and aging resistance of the high-strength rubber material for nitrile gloves.

[0049] Compared with Examples 6 to 7, the tensile strength and tensile strength after aging of Examples 8 to 9 are improved, indicating that when the weight ratio of light calcium carbonate to cellulose acetate butyrate and to ethylene-vinyl acetate copolymer is 4 to 7:1, the tensile properties and aging resistance of the high-strength rubber material for nitrile gloves can be further improved.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength rubber material for nitrile gloves, characterized in that: The composition comprises the following components in parts by weight: 120 parts of modified nitrile latex, 2-4 parts of vulcanizing agent, 0.3-0.8 parts of accelerator, 1-3 parts of titanium dioxide, 1-2 parts of anti-aging agent, 1-4 parts of surfactant, 150 parts of water; The modified nitrile latex is obtained by modifying the nitrile latex with a modifier; The weight ratio of the nitrile latex to the modifier is 100:4-8; The modifier comprises light calcium carbonate and cellulose acetate butyrate in a weight ratio of 1:9 to 9:1; The nitrile latex includes carboxyl nitrile latex.

2. The high-strength rubber material for nitrile gloves according to claim 1, characterized in that: The weight ratio of the light calcium carbonate to cellulose acetate butyrate is 1-3:

1.

3. The high-strength rubber material for nitrile gloves according to claim 1, characterized in that: The preparation method of the modified nitrile latex comprises the following steps: adding a dispersant to the modifier, ball milling once, adding the nitrile latex, ball milling twice, and obtaining the modified nitrile latex; The weight ratio of the modifier to the dispersant is 10:0.

5.

4. The high-strength rubber material for nitrile gloves according to claim 1, characterized in that: The modifier also includes ethylene-vinyl acetate copolymer.

5. The high-strength rubber material for nitrile gloves according to claim 4, characterized in that: In the modifier, the weight ratio of the light calcium carbonate to the cellulose acetate butyrate and to the ethylene-vinyl acetate copolymer is 4-7:

1.

6. The high-strength rubber material for nitrile gloves according to claim 5, characterized in that: The preparation method of the modified nitrile latex comprises the following steps: A1. After melting the ethylene-vinyl acetate copolymer, add the light calcium carbonate and the cellulose acetate butyrate, mix them evenly, and obtain a mixed modifier; A2, adding dispersant to the mixed modifier, ball milling once, adding the nitrile latex, ball milling twice, to obtain the modified nitrile rubber; The weight ratio of the mixed modifier to the dispersant is 10:0.

5.

7. The high-strength rubber material for nitrile gloves according to claim 1, characterized in that: Nitrile latex also includes ordinary nitrile latex.

8. The high-strength rubber material for nitrile gloves according to claim 7, characterized in that: The weight ratio of the carboxyl nitrile latex to the ordinary nitrile latex is 1-4:

1.

9. The high-strength rubber material for nitrile gloves according to claim 1, characterized in that: The vulcanizing agent includes one or two of sulfur and dicumyl peroxide; and / or The accelerator includes one or more of accelerator NA-22, accelerator BZ, and accelerator TP; and / or The surfactant includes one or both of polyvinyl alcohol and sodium lauryl sulfate; and / or The anti-aging agent includes one or more of anti-aging agent 4010NA, anti-aging agent 2246, and anti-aging agent D.

10. The production process of a high-strength rubber material for nitrile gloves according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, mixing an accelerator, titanium dioxide, an anti-aging agent, a surfactant and water, and stirring to obtain a mixture; S2, adding the modified nitrile latex and the vulcanizing agent into the mixture, mixing, stirring, drying, and vulcanizing to obtain the high-strength rubber material for nitrile gloves.

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