Standard rubber material, its production and use

Abstract

The application provides a standard rubber material and a preparation method and application thereof. The standard rubber material comprises a rubber base material and an additive; wherein the rubber base material comprises natural rubber, cis-butadiene rubber, styrene-butadiene rubber, high styrene and a vulcanizing agent; and the content of the natural rubber is 5-15%, the content of the cis-butadiene rubber is 20-40%, the content of the styrene-butadiene rubber is 20-40%, the content of the high styrene is 20-40%, and the content of the vulcanizing agent is 1-3% based on the total mass of the rubber base material being 100%. The standard rubber material of the application can meet the performance requirements of S96 standard rubber sliding blocks, has appropriate hardness and resilience, has excellent uniformity and stability, and is suitable for calibrating the friction coefficient of the anti-skid test interface.

Description

Technical Field

[0001] This invention relates to a standard rubber material, its preparation method, and its uses, belonging to the field of standard sample preparation. Background Technology

[0002] The S96 standard rubber definition can be traced back to Appendix C of the ISO 13287:2019 standard, and its full name is "SpecimenSlider S96". It is mainly used for the calibration of anti-slip test interfaces.

[0003] Currently, the main testing methods for the anti-slip performance of footwear both domestically and internationally include HG / T 3780-2012, GB / T 3903.6-2024, GB / T 28287-2012, ISO 13287: 2012, SATRA TM144-2011, and ASTM F2913-2011. From the testing principles and instruments, it can be seen that GB / T 3903.6-2024, GB / T 28287-2012, ASTM F2913-2011, ISO 13287: 2019, and SATRA TM 144-2011 are essentially the same and are internationally accepted methods. However, the S96 standard rubber used for calibration of various anti-slip interfaces (such as ceramic tiles and wood flooring) in the current standards is still entirely dependent on imports. This product not only has a short shelf life (1 year), but its price has also been rising continuously in recent years, and the supply cycle is long and unstable. This has seriously affected the implementation and enforcement of domestic testing standards for anti-slip methods in footwear.

[0004] S96 standard rubber materials must not only meet the performance requirements for S96 standard rubber sliders in ISO 13287:2019 Annex C.2.1, GB / T 3903.2-2017 5.6, and GB / T 28287-2012 Annex B.1.1 (hardness of (96±2)IRHD and resilience of (24±2)% at (23±2)℃), but also conform to the characteristics of standard samples, exhibiting good uniformity and stability. Furthermore, they must be suitable for calibrating anti-slip test interfaces.

[0005] Currently, there is no standard rubber material in the existing technology that can meet the above requirements. Therefore, researching a standard rubber material that can meet the above requirements has become an urgent technical problem to be solved. Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In view of the technical problems existing in the prior art, the present invention first provides a standard rubber material. The standard rubber material of the present invention can meet the performance requirements of the S96 standard rubber slider, with suitable hardness and resilience, and also has excellent uniformity and stability, making it suitable for friction coefficient calibration testing of anti-slip test interfaces.

[0008] The present invention also provides a method for preparing a standard rubber material, which is simple and easy to implement, uses readily available raw materials, and is suitable for mass production.

[0009] Solution for solving the problem

[0010] This invention provides a standard rubber material, comprising: a rubber base material and additives; wherein,

[0011] The rubber substrate includes natural rubber, butadiene rubber, styrene-butadiene rubber, high-styrene rubber, and a vulcanizing agent; and...

[0012] Based on the total mass of the rubber substrate as 100%, the content of natural rubber is 5-15%, the content of butadiene rubber is 20-40%, the content of styrene-butadiene rubber is 20-40%, the content of high styrene is 20-40%, and the content of vulcanizing agent is 1-3%.

[0013] According to the standard rubber material of the present invention, the mass ratio of natural rubber, butadiene rubber, styrene-butadiene rubber, and high styrene is 1:1~5:1~6:1~6.

[0014] According to the standard rubber material of the present invention, the content of the additive is 50-90% based on the total mass of the rubber substrate as 100%.

[0015] According to the standard rubber material of the present invention, the additives include one or more of the following: fillers, plasticizers, activators, antioxidants, and vulcanization accelerators.

[0016] According to the standard rubber material of the present invention, the content of the filler is 40-65% based on the total mass of the rubber substrate (100%), the content of the plasticizer is 5-15%, the content of the activator is 5-15%, the content of the antioxidant is 0.1-3%, and the content of the vulcanization accelerator is 0.5-5%.

[0017] The present invention also provides a method for preparing a standard rubber material according to the present invention, which includes mixing the raw materials of the standard rubber material, refining them into sheets, and then molding them to obtain the standard rubber material.

[0018] According to the preparation method of the present invention, the preparation method includes the following steps:

[0019] (1) After mixing the rubber base material and additives, a compound rubber is obtained;

[0020] (2) The compounded rubber is sheeted to obtain compounded rubber sheets;

[0021] (3) The compounded rubber sheet is molded to obtain standard rubber material.

[0022] According to the preparation method of the present invention, the mixing temperature is 75-85°C;

[0023] During the refining process, the temperature of the roller surface is 40~60℃.

[0024] According to the preparation method of the present invention, the molding temperature is 140-160℃, the molding pressure is 3-10 MPa, and the molding time is 10-20 min.

[0025] The present invention also provides a method for using the standard rubber material according to the present invention in footwear anti-slip testing;

[0026] Preferably, the footwear anti-slip test includes a friction coefficient calibration test to calibrate the anti-slip test interface.

[0027] The effects of the invention

[0028] The standard rubber material of this invention can meet the performance requirements of S96 standard rubber sliders, with suitable hardness and resilience, as well as excellent uniformity and stability, and is suitable for friction coefficient calibration testing of anti-slip test interfaces.

[0029] The preparation method of the standard rubber material of the present invention is simple and easy to implement, the raw materials are readily available, and it is suitable for mass production. Attached Figure Description

[0030] Figure 1 A photograph of the standard rubber material of the present invention is shown. Detailed Implementation

[0031] Various exemplary embodiments, features, and aspects of the present invention will be described in detail below. The term "exemplary" as used herein means "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as superior to or better than other embodiments.

[0032] Furthermore, to better illustrate the present invention, numerous specific details are set forth in the following detailed embodiments. Those skilled in the art should understand that the present invention can be practiced without certain specific details. In other instances, methods, means, apparatus, and steps well known to those skilled in the art have not been described in detail in order to highlight the spirit of the present invention.

[0033] Unless otherwise stated, all units used in this specification are international standard units, and all numerical values ​​and ranges appearing in this invention should be understood to include systematic errors that are unavoidable in industrial production.

[0034] In this specification, the word "may" has two meanings: to perform a certain process and not to perform a certain process.

[0035] In this specification, references to "some specific / preferred embodiments," "other specific / preferred embodiments," "implementation," etc., refer to specific elements (e.g., features, structures, properties, and / or characteristics) related to that embodiment, which are included in at least one of the embodiments described herein and may or may not be present in other embodiments. Furthermore, it should be understood that these elements may be combined in any suitable manner in various embodiments.

[0036] In this specification, the range of values ​​referred to as "value A to value B" refers to the range including the endpoint values ​​A and B.

[0037] <First Aspect>

[0038] A first aspect of the present invention provides a standard rubber material comprising: a rubber substrate and additives; wherein,

[0039] The rubber substrate includes natural rubber, butadiene rubber, styrene-butadiene rubber, high-styrene rubber, and a vulcanizing agent; and...

[0040] Based on the total mass of the rubber substrate as 100%, the content of natural rubber is 5-15%, the content of butadiene rubber is 20-40%, the content of styrene-butadiene rubber is 20-40%, the content of high styrene is 20-40%, and the content of vulcanizing agent is 1-3%.

[0041] The standard rubber material of this invention can meet the performance requirements of S96 standard rubber sliders, with suitable hardness and resilience, as well as excellent uniformity and stability, and is suitable for friction coefficient calibration testing of anti-slip test interfaces.

[0042] The inventors of this invention have discovered that by using natural rubber, butadiene rubber, styrene-butadiene rubber, and high-styrene rubber, the standard rubber material of this invention can meet the requirements for hardness and resilience of standard rubber in ISO 13287 S96; and can also meet the friction coefficient requirements for anti-slip tile interface testing. Furthermore, the standard rubber material of this invention exhibits excellent uniformity and stability; uniformity refers to the absence of significant differences between and within samples, and stability can achieve a shelf life of more than 3 years.

[0043] Specifically, based on the total mass of the rubber substrate as 100%, the content of natural rubber is 5-15%, for example: 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, etc. Natural rubber can provide the basic strength and processability of standard rubber materials. If the content of natural rubber is less than 5%, it cannot play its corresponding role; if the content of natural rubber is higher than 15%, the aging resistance of the standard rubber material is poor.

[0044] Furthermore, based on the total mass of the rubber substrate as 100%, the content of butadiene rubber is 20-40%, for example: 21%, 23%, 25%, 27%, 29%, 31%, 32%, 35%, 37%, 39%, etc. Butadiene rubber ensures wear resistance and high elasticity. If the content of butadiene rubber is less than 20%, it will not function effectively; if the content of butadiene rubber is greater than 40%, the strength will be lower and the processing performance will be poor.

[0045] Furthermore, based on the total mass of the rubber substrate as 100%, the content of styrene-butadiene rubber (SBR) is 20-40%, for example: 21%, 23%, 25%, 27%, 29%, 31%, 32%, 35%, 37%, 39%, etc. SBR provides good heat resistance and aging resistance. If the SBR content is less than 20%, it will not function effectively; if the SBR content is greater than 40%, elasticity will decrease and processing performance will be poor.

[0046] Furthermore, based on the total mass of the rubber substrate (100%), the content of high-styrene is 20-40%, for example: 21%, 23%, 25%, 27%, 29%, 31%, 32%, 35%, 37%, 39%, etc. In this invention, high-styrene provides greater hardness. If the content of high-styrene is less than 20%, it is ineffective; if the content of high-styrene is greater than 40%, the processing performance decreases.

[0047] In some specific implementations, the mass ratio of natural rubber, butadiene rubber, styrene-butadiene rubber, and high-styrene is 1:1~5:1~6:1~6, for example: 1:2~4:2~5:2~5, 1:2.5~3.5:3~4:3~4, etc. When the mass ratio of natural rubber, butadiene rubber, styrene-butadiene rubber, and high-styrene is 1:1~5:1~6:1~6, the hardness and resilience are more suitable, and it has better uniformity and stability.

[0048] Vulcanized rubber is obtained by using a vulcanizing agent. The present invention does not impose a particular limitation on the vulcanizing agent, and it can be a vulcanizing agent commonly used in the art. Specifically, in the present invention, based on 100% of the total mass of the rubber substrate, the content of the vulcanizing agent is 1-3%, for example: 1.2%, 1.5%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, etc.; when the content of the vulcanizing agent is 1-3%, it is more advantageous to obtain the desired vulcanized rubber.

[0049] Generally, vulcanizing agents include inorganic vulcanizing agents and organic vulcanizing agents. Inorganic vulcanizing agents include sulfur, sulfur monochloride, selenium, tellurium, etc. Organic vulcanizing agents include sulfur-containing accelerators (such as accelerator TMTD), organic peroxides (such as benzoyl peroxide), quinone oxime compounds, polysulfide polymers, ethyl carbamate, maleimide derivatives, etc. In this invention, to avoid introducing other impurities, sulfur is preferably used as the vulcanizing agent.

[0050] In this invention, based on the total mass of the rubber substrate as 100%, the content of the additive is 50-90%, for example: 55%, 60%, 65%, 70%, 75%, 80%, 85%, etc. Further, the additive includes one or a combination of two or more of fillers, plasticizers, activators, antioxidants, and vulcanization accelerators.

[0051] Regarding the filler, this invention uses a filler to reinforce the rubber, thereby improving its mechanical strength. Furthermore, in this invention, based on the total mass of the rubber substrate (100%), the filler content is 40-60%, for example: 42%, 45%, 48%, 50%, 52%, 55%, 58%, etc. When the filler content is 40-65%, the mechanical strength of the rubber can be effectively improved. Specifically, in this invention, the filler can be precipitated hydrated silica, also known as white carbon black or white smoke.

[0052] Plasticizers can be used to reduce the Mooney viscosity of the rubber compound to improve in-mold flowability, thereby improving molding. In this invention, the plasticizer can be a naphthenic oil. Based on 100% of the total mass of the rubber substrate, the content of the plasticizer is 5-15%, for example: 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, etc. When the plasticizer content is 5-15%, the plasticizer's effect can be effectively exerted.

[0053] For activators, they are chemical substances that can increase the activity of vulcanization accelerators, improve the vulcanization speed and efficiency of rubber compounds, and improve the properties of vulcanized rubber. Furthermore, in this invention, based on the total mass of the rubber substrate as 100%, the content of the activator is 5-15%, for example: 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, etc. When the content of the activator is 5-15%, the activator can better exert its effect, improve vulcanization activity, and improve the surface smoothness and texture of the vulcanized rubber. Specifically, in this invention, the activator can be one or a combination of two or more of polyethylene glycol, zinc oxide, magnesium oxide, etc.

[0054] For vulcanization accelerators, they are compounding agents that can accelerate the crosslinking reaction of rubber compounds, shorten vulcanization time, lower vulcanization temperature, and reduce the amount of vulcanizing agent used. Furthermore, in this invention, based on the total mass of the rubber substrate as 100%, the content of the vulcanization accelerator is 0.5-5%, for example: 1%, 1.5%, 2 parts, 2.5%, 3%, 3.5%, 4%, 4.5%, etc.; when the content of the vulcanization accelerator is 0.5-5 parts, it can exert a higher vulcanization promoting effect and ensure scorch safety.

[0055] Specifically, in this invention, the vulcanization accelerator may be one or a combination of two or more of N-cyclohexyl-2-benzothiazole sulfenamide, N-tert-butyl-2-benzothiazole sulfenamide, 2,2'-dibenzothiazole disulfide, tetramethylthiuram monosulfide, 2-thiol benzothiazole, dibenzothiazole disulfide, and tetramethylthiuram disulfide.

[0056] The antioxidant in this invention is used to prevent rubber aging and extend the service life of rubber products, thus giving the rubber adhesive strength standard sample of this invention excellent aging resistance. Furthermore, in this invention, based on the total mass of the rubber substrate as 100%, the content of the antioxidant is 0.1-3%, for example: 0.5%, 1%, 1.5%, 2%, 2.5%, etc.; when the content of the antioxidant is 0.1-3 parts, the antioxidant can effectively exert its anti-aging effect and is less prone to blooming.

[0057] The antioxidant may be one or a combination of two or more of the following: 1,2-bis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hydrazine, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 4,4'-thiobis(6-tert-butyl-3-methylphenol), N-isopropyl-N'-phenyl-p-phenylenediamine, distearate thiodipropionate, and dilaurate thiodipropionate.

[0058] <Second aspect>

[0059] A second aspect of the present invention provides a method for preparing a standard rubber material according to the first aspect of the present invention, which includes mixing raw materials of the standard rubber material, refining them into sheets, and then molding them to obtain a vulcanized rubber layer.

[0060] In some specific implementations, the preparation method includes the following steps:

[0061] (1) After mixing the rubber base material and additives, a compound rubber is obtained;

[0062] (2) The compounded rubber is sheeted to obtain compounded rubber sheets;

[0063] (3) The compounded rubber sheet is molded to obtain vulcanized rubber sheet.

[0064] Specifically, the mixing temperature is 75-85℃; during the sheeting process, the temperature of the roller surface is 40-60℃.

[0065] In some specific implementations, the molding temperature is 140-160℃, the molding pressure is 3-10 MPa, and the molding time is 10-20 min.

[0066] <Third aspect>

[0067] A third aspect of the present invention provides a method for using the standard rubber material described in the first aspect of the present invention in a footwear anti-slip test.

[0068] Specifically, the footwear anti-slip test includes a friction coefficient calibration test to calibrate the anti-slip test interface.

[0069] Example

[0070] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0071] Example 1

[0072] First, preheat the internal mixer to 80±5℃. Add approximately 167 g of natural rubber, 500 g of butadiene rubber, 666 g of styrene-butadiene rubber, and 667 g of high-styrene rubber to the internal mixer at a speed of 30 r / min. After 7.5 minutes of mixing, add 160 g of zinc oxide, 30 g of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and 100 g of naphthenic oil. After 5 minutes of mixing, add 1000 g of silica. After 15 minutes of mixing, add 50 g of sulfur, 34 g of dibenzothiazole 2,2'-disulfide, and 6 g of tetramethylthiuram disulfide. Continue mixing for another 5 minutes, then discharge the mixture to obtain the final compound. The final temperature of the compound is controlled at 75℃±5℃.

[0073] The mixed rubber is then transferred to an open mill for sheet production. The open mill has a diameter of 250 mm and a working width of 400 mm. The roller surface temperature is 50℃±5℃. After 1 minute of open milling, the rubber is cut 3-4 times. After 5 minutes, the rubber sheet is flipped and pressed. After 10 minutes, the sheet production ends. The final temperature is controlled at around 70℃ to obtain the mixed rubber sheet.

[0074] The mixed rubber sheet (approximately 6.5 mm) after open mixing is placed into a mold preheated to 150℃±2℃, and then placed on a flat vulcanizing machine to apply pressure for degassing. The pressure is then increased to 5 MPa, and vulcanization is performed for 15 minutes. After vulcanization, the mold is opened to obtain standard rubber material, such as... Figure 1 As shown.

[0075] Example 2

[0076] First, preheat the internal mixer to 80±5℃. Add approximately 254 g of natural rubber, 476 g of butadiene rubber, 635 g of styrene-butadiene rubber, and 635 g of high-styrene rubber to the internal mixer at a speed of 30 r / min. After 7.5 min of mixing, add 160 g of zinc oxide, 30 g of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and 100 g of naphthenic oil. After 5 min of mixing, add 1000 g of silica. After 15 min of mixing, add 50 g of sulfur, 34 g of dibenzothiazole 2,2'-disulfide, and 6 g of tetramethylthiuram disulfide. After 5 min of mixing, discharge the mixture to obtain the compound. The final temperature of the compound is controlled at 75℃±5℃.

[0077] The mixed rubber is then transferred to an open mill for sheet production. The open mill has a diameter of 250 mm and a working width of 400 mm. The roller surface temperature is 50℃±5℃. After 1 minute of open milling, the rubber is cut 3-4 times. After 5 minutes, the rubber sheet is flipped and pressed. After 10 minutes, the sheet production ends. The final sheet temperature is controlled at around 70℃ to obtain the mixed rubber sheet.

[0078] The mixed rubber sheet (approximately 6.5 mm) after open milling is placed into a mold preheated to 150℃±2℃, placed on a flat vulcanizing machine to apply pressure for degassing, and then pressurized to 5 MPa. After vulcanizing for 15 min, the mold is opened to obtain standard rubber material.

[0079] Example 3

[0080] First, preheat the internal mixer to 80±5℃. Add approximately 233 g of natural rubber, 433 g of butadiene rubber, 667 g of styrene-butadiene rubber, and 667 g of high-styrene rubber to the internal mixer at a speed of 30 r / min. After 7.5 minutes of mixing, add 160 g of zinc oxide, 30 g of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and 100 g of naphthenic oil. After 5 minutes of mixing, add 1000 g of silica. After 15 minutes of mixing, add 50 g of sulfur, 34 g of dibenzothiazole 2,2'-disulfide, and 6 g of tetramethylthiuram disulfide. After 5 minutes of mixing, discharge the mixture to obtain the compound. The final temperature of the compound is controlled at 75℃±5℃.

[0081] The mixed rubber is then transferred to an open mill for sheet production. The open mill has a diameter of 250 mm and a working width of 400 mm. The roller surface temperature is 50℃±5℃. After 1 minute of open milling, the rubber is cut 3-4 times. After 5 minutes, the rubber sheet is flipped and pressed. After 10 minutes, the sheet production ends. The final sheet temperature is controlled at around 70℃ to obtain the mixed rubber sheet.

[0082] The mixed rubber sheet (approximately 6.5 mm) after open milling is placed into a mold preheated to 150℃±2℃, placed on a flat vulcanizing machine to apply pressure for degassing, and then pressurized to 5 MPa. After vulcanizing for 15 min, the mold is opened to obtain standard rubber material.

[0083] Example 4

[0084] First, preheat the internal mixer to 80±5℃. Add approximately 300 g of natural rubber, 366 g of butadiene rubber, 667 g of styrene-butadiene rubber, and 667 g of high-styrene rubber to the internal mixer at a speed of 30 r / min. After 7.5 minutes of mixing, add 160 g of zinc oxide, 30 g of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and 100 g of naphthenic oil. After 5 minutes of mixing, add 1000 g of silica. After 15 minutes of mixing, add 50 g of sulfur, 34 g of dibenzothiazole 2,2'-disulfide, and 6 g of tetramethylthiuram disulfide. After 5 minutes of mixing, discharge the mixture to obtain the compound. The final temperature of the compound is controlled at 75℃±5℃.

[0085] The mixed rubber is then transferred to an open mill for sheet production. The open mill has a diameter of 250 mm and a working width of 400 mm. The roller surface temperature is 50℃±5℃. After 1 minute of open milling, the rubber is cut 3-4 times. After 5 minutes, the rubber sheet is flipped and pressed. After 10 minutes, the sheet production ends. The final sheet temperature is controlled at around 70℃ to obtain the mixed rubber sheet.

[0086] The mixed rubber sheet (approximately 6.5 mm) after open milling is placed into a mold preheated to 150℃±2℃, placed on a flat vulcanizing machine to apply pressure for degassing, and then pressurized to 5 MPa. After vulcanizing for 15 min, the mold is opened to obtain standard rubber material.

[0087] Comparative Example 1

[0088] First, preheat the internal mixer to 80±5℃. Add approximately 222 g of natural rubber, 667 g of butadiene rubber, and 1111 g of styrene-butadiene rubber to the internal mixer at a speed of 30 r / min. After 7.5 min of mixing, add 160 g of zinc oxide, 30 g of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and 100 g of naphthenic oil. After 5 min of mixing, add 1000 g of silica. After 15 min of mixing, add 50 g of sulfur, 34 g of dibenzothiazole 2,2'-disulfide, and 6 g of tetramethylthiuram disulfide. After 5 min of mixing, discharge the mixture to obtain the compound. The final temperature of the compound is controlled at 75℃±5℃.

[0089] The mixed rubber is then transferred to an open mill for sheet production. The open mill has a diameter of 250 mm and a working width of 400 mm. The roller surface temperature is 50℃±5℃. After 1 minute of open milling, the rubber is cut 3-4 times. After 5 minutes, the rubber sheet is flipped and pressed. After 10 minutes, the sheet production ends. The final sheet temperature is controlled at around 70℃ to obtain the mixed rubber sheet.

[0090] The mixed rubber sheet (approximately 6.5 mm) after open milling is placed into a mold preheated to 150℃±2℃, placed on a flat vulcanizing machine to apply pressure for degassing, and then pressurized to 5 MPa. After vulcanizing for 15 min, the mold is opened to obtain standard rubber material.

[0091] Comparative Example 2

[0092] First, preheat the internal mixer to 80±5℃. Add approximately 267 g of natural rubber, 333 g of butadiene rubber, 500 g of styrene-butadiene rubber, and 900 g of high-styrene rubber to the internal mixer at a speed of 30 r / min. After 7.5 minutes of mixing, add 160 g of zinc oxide, 30 g of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and 100 g of naphthenic oil. After 5 minutes of mixing, add 1000 g of silica. After 15 minutes of mixing, add 50 g of sulfur, 34 g of dibenzothiazole 2,2'-disulfide, and 6 g of tetramethylthiuram disulfide. After 5 minutes of mixing, discharge the mixture to obtain the compound. The final temperature of the compound is controlled at 75℃±5℃.

[0093] The mixed rubber is then transferred to an open mill for sheet production. The open mill has a diameter of 250 mm and a working width of 400 mm. The roller surface temperature is 50℃±5℃. After 1 minute of open milling, the rubber is cut 3-4 times. After 5 minutes, the rubber sheet is flipped and pressed. After 10 minutes, the sheet production ends. The final sheet temperature is controlled at around 70℃ to obtain the mixed rubber sheet.

[0094] The mixed rubber sheet (approximately 6.5 mm) after open milling is placed into a mold preheated to 150℃±2℃, placed on a flat vulcanizing machine to apply pressure for degassing, and then pressurized to 5 MPa. After vulcanizing for 15 min, the mold is opened to obtain standard rubber material.

[0095] Comparative Example 3

[0096] First, preheat the internal mixer to 80±5℃. Add approximately 200 g of natural rubber, 600 g of butadiene rubber, 1000 g of styrene-butadiene rubber, and 200 g of high-styrene rubber to the internal mixer at a speed of 30 r / min. After 7.5 minutes of mixing, add 160 g of zinc oxide, 30 g of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and 100 g of naphthenic oil. After 5 minutes of mixing, add 1000 g of silica. After 15 minutes of mixing, add 50 g of sulfur, 34 g of dibenzothiazole 2,2'-disulfide, and 6 g of tetramethylthiuram disulfide. After 5 minutes of mixing, discharge the mixture to obtain the compound. The final temperature of the compound is controlled at 75℃±5℃.

[0097] The mixed rubber is then transferred to an open mill for sheet production. The open mill has a diameter of 250 mm and a working width of 400 mm. The roller surface temperature is 50℃±5℃. After 1 minute of open milling, the rubber is cut 3-4 times. After 5 minutes, the rubber sheet is flipped and pressed. After 10 minutes, the sheet production ends. The final sheet temperature is controlled at around 70℃ to obtain the mixed rubber sheet.

[0098] The mixed rubber sheet (approximately 6.5 mm) after open milling is placed into a mold preheated to 150℃±2℃, placed on a flat vulcanizing machine to apply pressure for degassing, and then pressurized to 5 MPa. After vulcanizing for 15 min, the mold is opened to obtain standard rubber material.

[0099] Comparative Example 4

[0100] SATRA-S96# sample (Smithers, UK).

[0101] Performance testing

[0102] 1. Friction test

[0103] The dry and wet dynamic friction cross-verification tests of Examples 1-4 and Comparative Examples 1-4 were conducted according to GB / T 3903.6-2017, and the results are shown in Table 1 below.

[0104] Table 1

[0105]

[0106] The results of the dry and wet dynamic friction tests of Examples 1-4 and Comparative Example 4 show that the test results of Examples 1-4 are basically consistent with SATRA-S96#, and all meet the standard value range requirements of GSB 16-4167-2024 and SATRA STM-603, indicating that there is no significant difference between the standard rubber material of the present invention and SATRA-S96#.

[0107] In Comparative Examples 1-2, the dry and wet friction coefficients were too high, both exceeding the standard value range requirements of GSB 16-4167-2024 and SATRA STM-603.

[0108] In Comparative Example 3, the dry and wet friction coefficients were too low, falling below the standard value range requirements of GSB 16-4167-2024 and SATRA STM-603.

[0109] 2. Stability Test

[0110] Stability testing was conducted using ISO 48-2:2018 "Rubber, vulcanized or thermoplastic - Determination of hardness - Part 2: Hardness between 10 IRHD and 100 IRHD" and ISO 4662:2017 "Rubber, vulcanized or thermoplastic - Determination of reboundresilience" to test the hardness and resilience of Example 1, including short-term and long-term stability tests. Short-term stability was related to external environmental factors during sample transportation, primarily studying the effects of high temperature (70℃) and low temperature (-20℃) conditions on the samples during transport. Long-term stability was related to storage conditions and storage time, primarily studying the stability of the samples within 36 months under normal temperature storage conditions.

[0111] Table 2. Short-term stability test results of rubber standard samples in Example 1

[0112]

[0113] Table 3. Results of long-term stability test of rubber standard samples in Example 1

[0114]

[0115] As can be seen from Tables 2 and 3, the shelf life of the standard rubber material of the present invention is 3 years, while the shelf life of the standard rubber material of Comparative Example 4 is only 1 year. Therefore, the standard rubber material of the present invention has better stability.

[0116] 3. Hardness and resilience test

[0117] The hardness and resilience of the standard rubber material from Example 1 were tested.

[0118] (1) Hardness testing was conducted according to ISO 48-2: 2018 "Rubber, vulcanized or thermoplastic - Determination of hardness - Part 2: Hardness between 10 IRHD and 100 IRHD", and the results are shown in Table 4.

[0119] (2) The rebound resilience test was conducted according to ISO 4662:2017 "Rubber, vulcanized or thermoplastic - Determination of rebound resilience", and the results are shown in Table 4.

[0120] Table 4 Standard values ​​and uncertainties of the rubber standard samples in Example 1

[0121]

[0122] As can be seen from Table 4, the standard adhesive material of the present invention has excellent hardness and resilience, which can meet the testing requirements.

[0123] It should be noted that although the technical solution of the present invention has been described with specific examples, those skilled in the art will understand that the present invention should not be limited thereto.

[0124] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A standard rubber material, characterized in that, include: Rubber base material and additives; among which, The rubber substrate includes natural rubber, butadiene rubber, styrene-butadiene rubber, high-styrene rubber, and a vulcanizing agent; and... Based on the total mass of the rubber substrate as 100%, the content of natural rubber is 5-15%, the content of butadiene rubber is 20-40%, the content of styrene-butadiene rubber is 20-40%, the content of high styrene is 20-40%, and the content of vulcanizing agent is 1-3%.

2. The standard rubber material according to claim 1, characterized in that, The mass ratio of natural rubber, butadiene rubber, styrene-butadiene rubber, and high styrene is 1:1~5:1~6:1~6.

3. The standard rubber material according to claim 1 or 2, characterized in that, The content of the additive is 50-90% based on the total mass of the rubber substrate as 100%.

4. The standard rubber material according to any one of claims 1-3, characterized in that, The additives include one or more of the following: fillers, plasticizers, activators, antioxidants, and vulcanization accelerators.

5. The standard rubber material according to claim 4, characterized in that, Based on the total mass of the rubber substrate (100%), the content of the filler is 40-65%, the content of the plasticizer is 5-15%, the content of the activator is 5-15%, the content of the antioxidant is 0.1-3%, and the content of the vulcanization accelerator is 0.5-5%.

6. A method for preparing a standard rubber material according to any one of claims 1-5, characterized in that, This involves mixing the raw materials of standard rubber materials, refining them into sheets, and then molding them to obtain standard rubber materials.

7. The preparation method according to claim 6, characterized in that, The preparation method includes the following steps: (1) After mixing the rubber base material and additives, a compound rubber is obtained; (2) The compounded rubber is sheeted to obtain compounded rubber sheets; (3) The compounded rubber sheet is molded to obtain standard rubber material.

8. The preparation method according to claim 7, characterized in that, The mixing temperature is 75-85℃; During the refining process, the temperature of the roller surface is 40~60℃.

9. The preparation method according to claim 7 or 8, characterized in that, The molding temperature is 140-160℃, the molding pressure is 3-10 MPa, and the molding time is 10-20 min.

10. A method for using a standard rubber material according to any one of claims 1-5 in a footwear anti-slip test; Preferably, the footwear anti-slip test includes a friction coefficient calibration test to calibrate the anti-slip test interface.

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