Wearable hydrogenated nitrile rubber compound

Abstract

The invention relates to the technical field of rubber mixed compounds, in particular to a wearable hydrogenated nitrile rubber mixed compound which comprises hydrogenated nitrile rubber, precipitated silica, precipitated white carbon black, triethanolamine, an anti-aging agent, an active agent, a processing aid, a vulcanization cross-linking agent and a vulcanizing agent. Wherein the acrylonitrile content of the hydrogenated nitrile rubber is 27%-41%; the preparation method of the wearable hydrogenated nitrile rubber compound comprises the following steps: S1, raw rubber plastication; s2, rubber material mixing; s3, sheet discharging; s4, dynamic vulcanization; and S5, refining. The precipitation-method white carbon black is adopted to improve the density, ultraviolet resistance and coloring stability of the hydrogenated nitrile rubber compound, the triethanolamine is adopted to reduce the adsorption capacity of the precipitation-method white carbon black, the wearable hydrogenated nitrile rubber compound has good surface strength and stability, no obvious fingerprint is left when a human hand is in contact with the wearable hydrogenated nitrile rubber compound for a long time, and the service life of the wearable hydrogenated nitrile rubber compound is prolonged. The hand perspiration resistance is excellent.

Description

Technical Field

[0001] The invention relates to the technical field of rubber compound rubbers, in particular to a wearable hydrogenated nitrile butadiene rubber compound rubber. Background Art

[0002] In high-end smart watches, fluororubber straps are common. Fluororubber has outstanding resistance to high temperatures, oils, solvents, weather and chemicals, and is favored by smart watch brands. However, fluororubber has weak low-temperature performance, while hydrogenated nitrile rubber performs better than fluororubber in low-temperature environments and has comparable weather resistance and chemical resistance to fluororubber, making it one of the important choices for future wearable device materials. Hydrogenated nitrile rubber is easily affected by light and oxygen, and is prone to aging, cracking and hardening, resulting in loss of elasticity and performance degradation.

[0003] CN115181348B discloses an aging-resistant and wear-resistant rubber and its preparation process. The invention enhances the aging resistance and weather resistance of hydrogenated nitrile rubber products by using barium sulfate. However, the barium sulfate that has not been surface-modified has poor interfacial affinity with the hydrogenated nitrile rubber matrix and is prone to agglomeration, which affects the uniform distribution of the filler and the performance of the rubber products. Summary of the invention

[0004] The object of the present invention is to provide a wearable hydrogenated nitrile rubber compound to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a wearable hydrogenated nitrile rubber compound, the wearable hydrogenated nitrile rubber compound comprising the following components in parts by weight: 100 parts of hydrogenated nitrile rubber, 5-20 parts of precipitated silica, 50-80 parts of precipitated white carbon black, 0.5-2 parts of triethanolamine, 0.5-3 parts of antioxidant, 0.5-5 parts of activator, 0.5-3 parts of processing aid, 0.5-3 parts of vulcanization crosslinking agent, and 3-5 parts of vulcanizing agent;

[0006] Wherein, the acrylonitrile content of the hydrogenated nitrile butadiene rubber is 27% to 41%;

[0007] The preparation method of the wearable hydrogenated nitrile rubber compound comprises the following steps:

[0008] S1. Raw rubber plasticizing: first set the roller temperature of the internal mixer to 110℃, the roller speed to 20rpm, and start the vacuum system, then slowly put the hydrogenated nitrile rubber into the internal mixer, break the rubber and knead for 30s, finally gradually increase the roller temperature to 130-135℃, adjust the roller speed to 25rpm, and plasticize for 60-80s;

[0009] S2, mixing rubber material: first, add precipitated silica, precipitated white carbon black and triethanolamine into the internal mixer in sequence while the internal mixer is kept in vacuum state, mix and knead for 2 minutes, then add antioxidant, activator and processing aid, mix and knead for 10-12 minutes, discharge the material, and obtain the mixed rubber material;

[0010] S3, sheeting: first put the mixed rubber material into an open mixer and refine it at 80-90°C for 5-8 minutes, then filter it, and finally put it into a tablet press to calender and sheet out to obtain a primary rubber;

[0011] S4, dynamic vulcanization: first set the roller temperature of the internal mixer to 100-105°C and the roller speed to 20-30rpm, then put the primary rubber, vulcanization crosslinking agent and vulcanizing agent cooled to room temperature into the internal mixer in turn, mix and knead for 3-5 minutes to obtain the rubber compound;

[0012] S5, refining: putting the rubber material into an open mixer, refining it at 80-90° C. for 5-8 min, filtering it, and finally putting it into a tablet press to calender out sheets to obtain the wearable hydrogenated nitrile rubber compound.

[0013] Optionally, the processing aid is erucamide.

[0014] Optionally, the antioxidant is one of antioxidant RD, antioxidant Nargard445, and antioxidant MBZ.

[0015] Optionally, the vulcanizing agent is dipentadienyl vulcanizing agent or vulcanizing agent BIBP.

[0016] Optionally, the vulcanization cross-linking agent is triallyl isocyanurate.

[0017] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts precipitated silica to improve the density, ultraviolet resistance and coloring stability of hydrogenated nitrile rubber compound, and triethanolamine is adsorbed by the precipitated silica during the mixing process, thereby reducing the adsorption capacity of the precipitated silica, protecting the antioxidant, the activator and the processing aid from being adsorbed by the precipitated silica, thereby ensuring that the wearable hydrogenated nitrile rubber compound has good surface strength and stability, and will not leave obvious fingerprints when touched by human hands for a long time, and has excellent hand sweat resistance. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention are described clearly and completely below. 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.

[0019] Embodiment 1: The present invention provides the following technical solution: A wearable hydrogenated nitrile rubber compound, comprising the following components in parts by weight: 100 parts of hydrogenated nitrile rubber, 5 parts of precipitated silica, 50 parts of precipitated white carbon black, 0.5 parts of triethanolamine, 0.5 parts of antioxidant, 0.5 parts of activator, 0.5 parts of processing aid, 0.5 parts of vulcanization crosslinking agent, and 3 parts of vulcanizing agent. Among them, the acrylonitrile content of the hydrogenated nitrile rubber is 27%.

[0020] The preparation method of wearable hydrogenated nitrile rubber compound comprises the following steps:

[0021] S1. Raw rubber plasticizing: first set the roller temperature of the internal mixer to 110°C, the roller speed to 20rpm, and start the vacuum system, then slowly put the hydrogenated nitrile rubber into the internal mixer, break the rubber and knead for 30s, finally gradually increase the roller temperature to 130°C, adjust the roller speed to 25rpm, and plasticize for 60s;

[0022] S2, mixing rubber material: first, in a vacuum state of the internal mixer, add precipitated silica, precipitated white carbon black, and triethanolamine in order into the internal mixer, mix and knead for 2 minutes, then add antioxidant, activator, and processing aid, mix and knead for 10 minutes, and discharge to obtain a mixed rubber material;

[0023] S3, sheeting: first put the mixed rubber material into an open mixer and refine it at 80°C for 5 minutes, then filter it, and finally put it into a tablet press to calender and sheet out to obtain a primary rubber;

[0024] S4, dynamic vulcanization: first set the roller temperature of the internal mixer to 100 ° C, the roller speed to 20 rpm, then put the primary rubber, vulcanization cross-linking agent and vulcanizing agent cooled to room temperature into the internal mixer in turn, mix and knead for 3 minutes to obtain the rubber compound;

[0025] S5. Refining: The rubber material is put into an open mixing mill, refined at 80°C for 5 minutes, filtered, and finally put into a tablet press for calendering to obtain a wearable hydrogenated nitrile rubber compound.

[0026] Embodiment 2: The present invention provides the following technical solution: A wearable hydrogenated nitrile rubber compound, comprising the following components in parts by weight: 100 parts of hydrogenated nitrile rubber, 10 parts of precipitated silica, 60 parts of precipitated white carbon black, 1 part of triethanolamine, 1 part of antioxidant, 2 parts of activator, 1 part of processing aid, 1 part of vulcanization crosslinking agent, and 4 parts of vulcanizing agent. The acrylonitrile content of the hydrogenated nitrile rubber is 30%.

[0027] The preparation method of wearable hydrogenated nitrile rubber compound comprises the following steps:

[0028] S1. Raw rubber plasticizing: first set the roller temperature of the internal mixer to 110°C, the roller speed to 20rpm, and start the vacuum system, then slowly put the hydrogenated nitrile rubber into the internal mixer, break the rubber and knead for 30s, finally gradually increase the roller temperature to 132°C, adjust the roller speed to 25rpm, and plasticize for 70s;

[0029] S2, mixing rubber material: first, in a vacuum state of the internal mixer, add precipitated silica, precipitated white carbon black, and triethanolamine in order into the internal mixer, mix and knead for 2 minutes, then add antioxidant, activator, and processing aid, mix and knead for 11 minutes, and discharge to obtain a mixed rubber material;

[0030] S3, sheeting: first put the mixed rubber material into an open mixer and refine it at 84°C for 6 minutes, then filter it, and finally put it into a tablet press to calender and sheet out to obtain a primary rubber;

[0031] S4, dynamic vulcanization: first set the roller temperature of the internal mixer to 102 ° C, the roller speed to 24 rpm, then put the primary rubber, vulcanization cross-linking agent and vulcanizing agent cooled to room temperature into the internal mixer in turn, mix and knead for 4 minutes to obtain the rubber compound;

[0032] S5. Refining: The rubber material is put into an open mixing mill, refined at 85°C for 6 minutes, filtered, and finally put into a tablet press for calendering to obtain a wearable hydrogenated nitrile rubber compound.

[0033] Embodiment 3: The present invention provides the following technical solution: A wearable hydrogenated nitrile rubber compound, comprising the following components in parts by weight: 100 parts of hydrogenated nitrile rubber, 15 parts of precipitated silica, 70 parts of precipitated white carbon black, 1.5 parts of triethanolamine, 2 parts of antioxidant, 4 parts of activator, 2 parts of processing aid, 2 parts of vulcanization crosslinking agent, and 4 parts of vulcanizing agent. The acrylonitrile content of the hydrogenated nitrile rubber is 35%.

[0034] The preparation method of wearable hydrogenated nitrile rubber compound comprises the following steps:

[0035] S1. Raw rubber plasticizing: first set the roller temperature of the internal mixer to 110°C, the roller speed to 20rpm, and start the vacuum system, then slowly put the hydrogenated nitrile rubber into the internal mixer, break the rubber and knead for 30s, finally gradually increase the roller temperature to 134°C, adjust the roller speed to 25rpm, and plasticize for 70s;

[0036] S2, mixing rubber material: first, in a vacuum state of the internal mixer, add precipitated silica, precipitated white carbon black, and triethanolamine in order into the internal mixer, mix and knead for 2 minutes, then add antioxidant, activator, and processing aid, mix and knead for 11 minutes, and discharge to obtain a mixed rubber material;

[0037] S3, sheeting: first put the mixed rubber material into an open mixer and refine it at 88°C for 7 minutes, then filter it, and finally put it into a tablet press to calender and sheet out to obtain a primary rubber;

[0038] S4, dynamic vulcanization: first set the roller temperature of the internal mixer to 104 ° C, the roller speed to 28 rpm, then put the primary rubber, vulcanization cross-linking agent and vulcanizing agent cooled to room temperature into the internal mixer in turn, mix and knead for 4 minutes to obtain the rubber compound;

[0039] S5. Refining: The rubber material is put into an open mixing mill, refined at 88° C. for 7 min, filtered, and finally put into a tablet press for calendering to obtain a wearable hydrogenated nitrile rubber compound.

[0040] Embodiment 4: The present invention provides the following technical solution: A wearable hydrogenated nitrile rubber compound, comprising the following components in parts by weight: 100 parts of hydrogenated nitrile rubber, 20 parts of precipitated silica, 80 parts of precipitated white carbon black, 2 parts of triethanolamine, 3 parts of antioxidant, 5 parts of activator, 3 parts of processing aid, 3 parts of vulcanization crosslinking agent, and 5 parts of vulcanizing agent. The acrylonitrile content of the hydrogenated nitrile rubber is 41%.

[0041] The preparation method of wearable hydrogenated nitrile rubber compound comprises the following steps:

[0042] S1. Raw rubber plasticizing: first set the roller temperature of the internal mixer to 110°C, the roller speed to 20rpm, and start the vacuum system, then slowly put the hydrogenated nitrile rubber into the internal mixer, break the rubber and knead for 30s, finally gradually increase the roller temperature to 135°C, adjust the roller speed to 25rpm, and plasticize for 80s;

[0043] S2, mixing rubber material: first, in a vacuum state of the internal mixer, add precipitated silica, precipitated white carbon black, and triethanolamine in order into the internal mixer, mix and knead for 2 minutes, then add antioxidant, activator, and processing aid, mix and knead for 12 minutes, and discharge to obtain a mixed rubber material;

[0044] S3, sheeting: first put the mixed rubber material into an open mixer and refine it at 90°C for 8 minutes, then filter it, and finally put it into a tablet press to calender and sheet out to obtain a primary rubber;

[0045] S4, dynamic vulcanization: first set the roller temperature of the internal mixer to 105 ° C, the roller speed to 30 rpm, then put the primary rubber, vulcanization crosslinking agent and vulcanizing agent cooled to room temperature into the internal mixer in turn, mix and knead for 5 minutes to obtain the rubber compound;

[0046] S5. Refining: The rubber material is put into an open mixing mill, refined at 90°C for 8 minutes, filtered, and finally put into a tablet press for calendering to obtain a wearable hydrogenated nitrile rubber compound.

[0047] In Examples 1 to 4, the processing aid is erucamide, the antioxidant is Nargard 445, the vulcanizing agent is dipentadienyl vulcanizing agent, and the vulcanization crosslinking agent is triallyl isocyanurate.

[0048] Test Example 1

[0049] Test content: Examples 1 to 4 were used as the experimental group, and the hydrogenated nitrile rubber of model Japan Ruiong PBZ123 was used as the control group. The hardness of the experimental group and the control group was tested with a Shore durometer, and the tensile strength of the experimental group and the control group was tested with a TSL-1002 electronic tensile testing machine. The results are recorded in Table 1.

[0050] Table 1

[0051] Shore hardness / degree Tensile strength / MPa Control group 65 18.46 Example 1 72 22.51 Example 2 74 23.78 Example 3 75 24.69 Example 4 76 25.76

[0052] Test Example 2

[0053] Test content: Examples 1 to 4 were used as the experimental group, and the hydrogenated nitrile rubber of model Japan Ruiong PBZ123 was used as the control group. The experimental group and the control group were cut into 5cm×5cm×2cm specimens, and a layer of 60 microns of nitrile rubber paint was coated on the surface of the specimen. After standing at room temperature for 24 hours, a dust-free cloth soaked in artificial sweat was attached to the surface of the specimen and sealed with a plastic bag (a layer of dust-free cloth was used to wrap the test surface of the specimen, and the test surface of the specimen was placed upward in a temperature and humidity test box). After being placed at a temperature of 55°C and a humidity of 95% RH for 24 hours, the sweat on the surface of the specimen was wiped clean, and finally, after standing at room temperature for 2 hours, the adhesion was tested according to the "Scratching Test for Paint and Varnish Film" (GB / T 9286-1998), and the results are recorded in Table 2. The production process of artificial sweat is as follows: first weigh 7g of sodium chloride, 1g of urea, and 4g of 85% lactic acid, then dissolve and dilute to 1000ml with a 1:1 solution of methanol and distilled water.

[0054] Table 2

[0055] Adhesion level Control group 4B Example 1 5B Example 2 5B Example 3 5B Example 4 5B

[0056] 5B means that the edges of the lines are smooth, and there is no paint peeling at the edges and intersections of the lines. 4B means that small pieces of paint have peeled off at the intersections of the lines, and the total peeling area is less than 5%.

[0057] Compared with the hydrogenated nitrile rubber of model PBZ123 produced by Japan Zeon, the wearable hydrogenated nitrile rubber compound prepared in Examples 1 to 4 has excellent hand sweat tolerance.

[0058] Precipitated silica can optimize the processing fluidity of rubber, reduce energy consumption during processing, improve production efficiency, and help achieve a more uniform filling distribution, which can significantly improve the hardness and tensile strength of hydrogenated nitrile rubber, and at the same time improve the flexibility and resilience of hydrogenated nitrile rubber. The present invention uses precipitated silica to improve the density, ultraviolet tolerance and coloring stability of hydrogenated nitrile butadiene rubber compound, and triethanolamine is adsorbed by precipitated silica during the mixing process, thereby reducing the adsorption capacity of precipitated silica, protecting antioxidants, activators, and processing aids from being adsorbed by precipitated silica, thereby ensuring that the wearable hydrogenated nitrile butadiene rubber compound has good surface strength and stability, and no obvious fingerprints will be left after long-term contact with human hands, and the hand sweat resistance is excellent.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wearable hydrogenated nitrile rubber compound, characterized in that: The wearable hydrogenated nitrile rubber compound comprises the following components in parts by weight: 100 parts of hydrogenated nitrile rubber, 5-20 parts of precipitated silica, 50-80 parts of precipitated white carbon black, 0.5-2 parts of triethanolamine, 0.5-3 parts of antioxidant, 0.5-5 parts of activator, 0.5-3 parts of processing aid, 0.5-3 parts of vulcanization crosslinking agent, and 3-5 parts of vulcanizing agent; Wherein, the acrylonitrile content of the hydrogenated nitrile butadiene rubber is 27% to 41%; The preparation method of the wearable hydrogenated nitrile rubber compound comprises the following steps: S1. Raw rubber plasticizing: first set the roller temperature of the internal mixer to 110℃, the roller speed to 20rpm, and start the vacuum system, then slowly put the hydrogenated nitrile rubber into the internal mixer, break the rubber and knead for 30s, finally gradually increase the roller temperature to 130-135℃, adjust the roller speed to 25rpm, and plasticize for 60-80s; S2, mixing rubber material: first, add precipitated silica, precipitated white carbon black and triethanolamine into the internal mixer in sequence while the internal mixer is kept in vacuum state, mix and knead for 2 minutes, then add antioxidant, activator and processing aid, mix and knead for 10-12 minutes, discharge the material, and obtain the mixed rubber material; S3, sheeting: first put the mixed rubber material into an open mixer and refine it at 80-90°C for 5-8 minutes, then filter it, and finally put it into a tablet press to calender and sheet out to obtain a primary rubber; S4, dynamic vulcanization: first set the roller temperature of the internal mixer to 100-105°C and the roller speed to 20-30rpm, then put the primary rubber, vulcanization crosslinking agent and vulcanizing agent cooled to room temperature into the internal mixer in turn, mix and knead for 3-5 minutes to obtain the rubber compound; S5, refining: putting the rubber material into an open mixer, refining it at 80-90° C. for 5-8 min, filtering it, and finally putting it into a tablet press to calender out sheets to obtain the wearable hydrogenated nitrile rubber compound.

2. A wearable hydrogenated nitrile rubber compound according to claim 1, characterized in that: The processing aid is erucamide.

3. A wearable hydrogenated nitrile rubber compound according to claim 1, characterized in that: The antioxidant is one of antioxidant RD, antioxidant Nargard445 and antioxidant MBZ.

4. A wearable hydrogenated nitrile rubber compound according to claim 1, characterized in that: The vulcanizing agent is dipentadienyl vulcanizing agent or vulcanizing agent BIBP.

5. The wearable hydrogenated nitrile rubber compound according to claim 1, characterized in that: The vulcanization crosslinking agent is triallyl isocyanurate.