Low-temperature vulcanized rubber and its preparation method and application

Abstract

The present invention provides a low-temperature vulcanized rubber, a preparation method thereof, and an application thereof. The low-temperature vulcanized rubber comprises the following components, measured in parts by weight: 137 to 175 parts of base rubber, 1 to 2 parts of sulfur, 0.5 to 1 part of urea grease, 0.2 to 0.4 parts of accelerator ZBEC, 0.5 to 1 part of accelerator TBBS, and 0.5 to 1 part of accelerator ZDDP. The present invention uses accelerator ZBEC, accelerator TBBS, and accelerator ZDDP to form an accelerator for the low-temperature vulcanized rubber, and limits the dosage ratio of the base rubber, sulfur, urea grease, and each accelerator. While ensuring that the low-temperature vulcanized rubber has good physical and mechanical properties, the vulcanization can be completed at a lower temperature, with a fast vulcanization speed and a long scorch time. This solves the problems of high processing temperature and short scorch time of vulcanized rubber and is also conducive to reducing the production cost of vulcanized rubber.

Description

Technical Field

[0001] The present invention relates to the field of rubber technology, and in particular to a low-temperature vulcanized rubber and a preparation method and application thereof. Background Art

[0002] Rubber materials typically feature low density, excellent mechanical properties, high and low temperature resistance, and high hydrophobicity. Rubber products are increasingly used in fields such as footwear, automobiles, aerospace, and oil extraction. With the in-depth development of these fields, the demand for rubber continues to increase, and the performance requirements for rubber are also becoming increasingly higher.

[0003] The vulcanization temperature of rubber is one of the three major vulcanization factors and a fundamental condition for the vulcanization reaction. It directly affects the vulcanization speed and product quality. Like all chemical reactions, vulcanization accelerates with increasing temperature, favoring the formation of more low-sulfur crosslinks. Lower vulcanization temperatures slow the reaction and result in more polysulfide crosslinks. In theory, higher vulcanization temperatures are better for improving vulcanization efficiency, but in reality, they cannot be raised indefinitely. Rubber is a high-molecular polymer, and high temperatures can cause cleavage reactions in the rubber molecular chains, breaking crosslinks and causing a phenomenon known as "reversion," which degrades the physical and mechanical properties of the vulcanized rubber. For example, when vulcanizing natural rubber at high temperatures, the activity of dissolved oxygen in the rubber increases with temperature, causing intense oxidation, destroying the rubber's structure, and reducing its physical and mechanical properties. The vulcanization temperature for conventional rubber is generally between 150°C and 170°C. Higher vulcanization temperatures require more heat and increase heat loss, increasing production costs and hindering energy conservation and emission reduction. While ensuring that the physical and mechanical properties of the rubber remain unchanged, vulcanization is completed within the same time and the vulcanization temperature is lowered, which is conducive to reducing the production cost of rubber and achieving environmentally friendly production of rubber.

[0004] Currently, xanthate accelerators are primarily used to achieve low-temperature vulcanization of rubber. However, these accelerators result in extremely fast vulcanization, a narrow vulcanization plateau, poor storage stability, and the rubber is prone to self-vulcanization, leading to scrapping. This does not meet the requirements for long-term stable use of rubber. In addition, ultra-fast acid accelerators SIP, PZ, and BZ are also used to vulcanize rubber balls at lower temperatures. However, the large-scale use of ultra-fast acid accelerators can easily cause premature vulcanization of the rubber, which is not conducive to the stable storage of semi-finished rubber and cannot achieve large-scale production of rubber. Summary of the Invention

[0005] The invention aims to solve the problems of high temperature of existing rubber vulcanization and early vulcanization of rubber during the vulcanization process.

[0006] To solve the above problems, the first aspect of the present invention provides a low-temperature vulcanized rubber, which includes the following components, calculated by weight: 137-175 parts of base rubber, 1-2 parts of sulfur, 0.5-1 part of urea ester, 0.2-0.4 part of accelerator ZBEC, 0.5-1 part of accelerator TBBS, and 0.5-1 part of accelerator ZDDP.

[0007] Furthermore, the low-temperature vulcanized rubber comprises the following components in parts by weight: 155 parts of base rubber, 1.5 parts of sulfur, 0.75 parts of urea ester, 0.28 parts of accelerator ZBEC, 0.65 parts of accelerator TBBS, and 0.8 parts of accelerator ZDDP.

[0008] Furthermore, the base rubber includes the following components, in parts by weight: 30-50 parts of styrene-butadiene rubber, 10-30 parts of natural rubber, 30-50 parts of butadiene rubber, 0.5-2 parts of rubber protective wax, 0.5-2 parts of antioxidant, 1-5 parts of cyclohexane oil, 20-50 parts of white carbon black, 1-3 parts of polyethylene glycol PEG4000, 1-3 parts of diethylene glycol, 0.5-2 parts of stearic acid, 2-6 parts of zinc oxide, and 0.5-2 parts of silane coupling agent.

[0009] Furthermore, the total weight of the styrene-butadiene rubber, the natural rubber and the butadiene rubber is 100 parts.

[0010] Furthermore, the base rubber includes the following components: 40 parts of styrene-butadiene rubber, 15 parts of natural rubber, 45 parts of butadiene rubber, 1 part of rubber protective wax, 1 part of antioxidant, 3 parts of cyclohexane oil, 40 parts of white carbon black, 2 parts of polyethylene glycol PEG4000, 2 parts of diethylene glycol, 1 part of stearic acid, 4 parts of zinc oxide, and 1 part of silane coupling agent.

[0011] A second aspect of the present invention provides a method for preparing a low-temperature vulcanized rubber, which is used to prepare the low-temperature vulcanized rubber described in the first aspect, comprising the following steps:

[0012] Weigh each component according to weight;

[0013] kneading the base rubber to obtain the kneaded base rubber;

[0014] The mixed base rubber, sulfur, urea ester, accelerator ZBEC, accelerator TBBS and accelerator ZDDP are mixed to obtain a mixture I;

[0015] The mixture I is subjected to refining to obtain a mixture II;

[0016] The mixture II is vulcanized to obtain the low-temperature vulcanized rubber.

[0017] Furthermore, the banburying of the base rubber includes: banburying styrene-butadiene rubber, natural rubber and butadiene rubber to obtain a mixed rubber, and then banburying the mixed rubber, rubber protective wax, antioxidant, cyclohexane oil, white carbon black, polyethylene glycol PEG4000, diethylene glycol, stearic acid, zinc oxide and silane coupling agent to obtain the banburying base rubber; wherein, when banburying the mixed rubber, the banburying temperature is set to 80-100°C and the banburying time is 3-5 minutes; when banburying the base rubber, the banburying temperature is set to 80-100°C and the banburying time is 4-6 minutes.

[0018] Furthermore, when banburying the mixture I, the banburying temperature is set to 85-105° C., and the banburying time is 3-5 min; when refining the mixture I, the roller temperature of the open mill is set to 70-80° C., the roller distance is 1.5-2.5 mm, and the rubber is turned over 3 times.

[0019] Furthermore, the temperature of the vulcanization treatment is 130° C., and the time of the vulcanization treatment is (TC90+2) min.

[0020] A third aspect of the present invention provides a use of the low-temperature vulcanized rubber as described in the first aspect in preparing shoe soles.

[0021] The low-temperature vulcanized rubber of the present invention uses accelerators ZBEC, accelerator TBBS and accelerator ZDDP to form a vulcanized rubber accelerator. These three accelerators have different active functional groups. These active functional groups can form different complexes during the vulcanization process of the rubber. These complexes can not only reduce the active free sulfur, improve the scorch resistance of the vulcanized rubber, and solve the problem of early vulcanization of the vulcanized rubber, but also these complexes can activate and synergize with each other to achieve the cracking and activation of sulfur at a lower temperature, and cross-link the active sulfur with the rubber macromolecules to form a network vulcanization of the rubber molecules, and obtain a vulcanized rubber with a relatively stable network structure. The accelerators of the vulcanized rubber are composed of accelerators ZBEC, accelerator TBBS and accelerator ZDDP, and the dosage ratios of the base rubber, sulfur, urea ester and each accelerator are limited. Under the condition of ensuring that the low-temperature vulcanized rubber has good physical and mechanical properties, the vulcanization can be completed at a lower temperature, with a fast vulcanization speed and a long scorch time, thereby solving the problems of high processing temperature and short scorch time of the vulcanized rubber and reducing the production cost of the vulcanized rubber.

[0022] The method for preparing low-temperature vulcanized rubber of the present invention uses specific raw materials to prepare low-temperature vulcanized rubber. While ensuring that the low-temperature vulcanized rubber has good physical and mechanical properties, it can complete vulcanization at a lower temperature, with a fast vulcanization speed and a long scorch time, thereby solving the problems of high processing temperature and short scorch time of vulcanized rubber and helping to reduce the production cost of vulcanized rubber. Moreover, the method for preparing low-temperature vulcanized rubber of the present application can improve the safety of production and processing by adopting specific preparation procedures, avoid scorch of rubber, and improve the effect of rubber mixing, thereby performing efficient vulcanization and improving the comprehensive performance of rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a process flow chart for preparing low-temperature vulcanized rubber provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0026] In addition, the terms "comprising", "including", "containing", and "having" are not restrictive, and other steps and other components that do not affect the results can be added. Unless otherwise specified, materials, equipment, and reagents are commercially available.

[0027] In addition, although the present invention describes the various steps in the preparation in the form of S1, S2, S3, etc., this description is only for ease of understanding. The form of S1, S2, S3, etc. does not limit the order of the steps.

[0028] A first aspect of an embodiment of the present application provides a low-temperature vulcanized rubber, which includes the following components, calculated by weight: 137 to 175 parts of base rubber, 1 to 2 parts of sulfur, 0.5 to 1 part of urea ester, 0.2 to 0.4 parts of accelerator ZBEC, 0.5 to 1 parts of accelerator TBBS, and 0.5 to 1 parts of accelerator ZDDP.

[0029] Among them, the accelerator TBBS (N-tert-butyl-2-benzothiazole sulfenamide) is a sulfenamide accelerator, and its effective active center functional group is Compared with thiazole accelerators, sulfonamide accelerators have anti-scorch groups and are less likely to undergo early vulcanization. In addition, accelerator TBBS has the characteristics of low decomposition temperature and low vulcanization activity temperature among sulfonamide accelerators. It also has an aftereffect, almost no discoloration, does not generate N-nitrosamines, and has little pollution. The use of accelerator TBBS is beneficial to improving the scorch resistance of vulcanized rubber and is conducive to completing vulcanization at a lower temperature.

[0030] Accelerator ZBEC (zinc dibenzyl dithiocarbamate) is an ultra-fast accelerator, and its effective active center functional group is Compared with other dithiocarbamate accelerators, accelerator ZBEC has the characteristics of long scorch time and high operational safety. Its low vulcanization activity temperature is conducive to reducing the vulcanization temperature. It does not produce carcinogenic nitrosamines during use, making it safer and more environmentally friendly. In addition, accelerator ZBEC can activate accelerator TBBS as a secondary accelerator. When used together, accelerator ZBEC and accelerator TBBS can regulate the scorch time and activation energy.

[0031] The effective active center functional group of the accelerator ZDDP (zinc dialkyl dithiophosphate) is The structure of its central functional group is similar to that of the central active functional group of accelerator ZBEC. When used together, the two can activate each other, which is beneficial to improving the efficiency of the entire vulcanization system and achieving rapid vulcanization at a lower temperature. In addition, the polarity of the P=S bond in accelerator ZDDP is small, and it is not easy to promote rubber cross-linking in the early stage of vulcanization, which is beneficial to improving the scorch resistance of vulcanized rubber. Accelerator ZDDP can also be used as an antioxidant to decompose the peroxy groups produced during the oxidation process, and synergistically with phenolic antioxidants to achieve anti-aging and yellowing effects. Accelerator ZDDP does not produce carcinogenic nitrosamines during use, making it safer and more environmentally friendly.

[0032] The low-temperature vulcanized rubber in the embodiment of the present application uses accelerators ZBEC, accelerator TBBS and accelerator ZDDP to form the accelerators of the vulcanized rubber. These three accelerators have different active functional groups. These active functional groups can form different complexes during the vulcanization process of the rubber. These complexes can not only reduce the active free sulfur, improve the scorch resistance of the vulcanized rubber, and solve the problem of early vulcanization of the vulcanized rubber, but also these complexes can activate and synergize with each other to achieve the cracking and activation of sulfur at a lower temperature, and cross-link the active sulfur with the rubber macromolecules to form a network vulcanization of the rubber molecules, and obtain a vulcanized rubber with a relatively stable network structure. The accelerators of the vulcanized rubber are composed of accelerators ZBEC, accelerator TBBS and accelerator ZDDP, and the dosage ratios of the base rubber, sulfur, urea ester and each accelerator are limited. Under the condition of ensuring that the low-temperature vulcanized rubber has good physical and mechanical properties, the vulcanization can be completed at a lower temperature, with a fast vulcanization speed and a long scorch time, thereby solving the problems of high processing temperature and short scorch time of the vulcanized rubber and reducing the production cost of the vulcanized rubber.

[0033] Based on the above embodiment, the low-temperature vulcanized rubber includes the following components by weight: 155 parts base rubber, 1.5 parts sulfur, 0.75 parts urea ester BK, 0.28 parts accelerator ZBEC, 0.65 parts accelerator TBBS, and 0.8 parts accelerator ZDDP. This can further improve the performance of the prepared low-temperature vulcanized rubber.

[0034] In this embodiment, the base rubber includes the following components, in parts by weight: 30-50 parts of styrene-butadiene rubber, 10-30 parts of natural rubber, 30-50 parts of butadiene rubber, 0.5-2 parts of rubber protective wax, 0.5-2 parts of antioxidant, 1-5 parts of naphthenic oil, 20-50 parts of white carbon black, 1-3 parts of polyethylene glycol PEG4000, 1-3 parts of diethylene glycol, 0.5-2 parts of stearic acid, 2-6 parts of zinc oxide, and 0.5-2 parts of silane coupling agent.

[0035] Based on the above embodiment, the total weight of styrene-butadiene rubber, natural rubber and butadiene rubber is 100 parts. Thus, using these three rubbers as the base rubber and limiting the amount of these three rubbers can ensure that the low-temperature vulcanized rubber has better physical and mechanical properties and mechanical properties.

[0036] Based on the above embodiment, the base rubber includes the following components: 40 parts of styrene-butadiene rubber, 15 parts of natural rubber, 45 parts of butadiene rubber, 1 part of rubber protective wax, 1 part of antioxidant, 3 parts of cyclohexane oil, 40 parts of white carbon black, 2 parts of polyethylene glycol PEG4000, 2 parts of diethylene glycol, 1 part of stearic acid, 4 parts of zinc oxide, and 1 part of silane coupling agent.

[0037] In this embodiment, styrene-butadiene rubber, natural rubber and butadiene rubber are used as base rubbers, and various complementary additives are added to limit the usage ratio of each component in the base rubber, which can ensure that the low-temperature vulcanized rubber has better physical and mechanical properties and mechanical properties.

[0038] Specifically, the styrene-butadiene rubber in this embodiment is styrene-butadiene rubber SBR-1502, the natural rubber is natural rubber NR, the butadiene rubber is butadiene rubber BR9000, the antioxidant is antioxidant BHT, the naphthenic oil is naphthenic oil KN4006, the white carbon black is white carbon black ZC-185, the silane coupling agent is silane coupling agent Si-69, and the urea ester is urea ester BK.

[0039] Figure 1 This is a process flow chart for preparing low-temperature vulcanized rubber in the embodiments of this application. Figure 1 As shown, the second aspect of the embodiment of the present application provides a method for preparing low-temperature vulcanized rubber, comprising the following steps:

[0040] Step S1, weighing each component by weight;

[0041] Step S2, performing banburying on the base rubber to obtain the banburying base rubber;

[0042] Step S3, mixing the base rubber, sulfur, urea ester, accelerator ZBEC, accelerator TBBS and accelerator ZDDP to obtain a mixture I;

[0043] Step S4, refining the mixture I to obtain a mixture II;

[0044] Step S5: vulcanizing the mixture II to obtain low-temperature vulcanized rubber.

[0045] The method for preparing low-temperature vulcanized rubber of the present application uses specific raw materials to prepare low-temperature vulcanized rubber. While ensuring that the low-temperature vulcanized rubber has good physical and mechanical properties, it can complete vulcanization at a lower temperature, with a fast vulcanization speed and a long scorch time, thereby solving the problems of high processing temperature and short scorch time of vulcanized rubber and helping to reduce the production cost of vulcanized rubber. Moreover, the method for preparing low-temperature vulcanized rubber of the present application adopts a specific preparation process, thereby improving the safety of production and processing, avoiding scorch of rubber, and improving the effect of rubber mixing, achieving efficient vulcanization and improving the comprehensive performance of rubber.

[0046] On the basis of the above embodiment, in step S2, the base rubber is subjected to banburying, which includes the following steps: banburying styrene-butadiene rubber, natural rubber and butadiene rubber, setting the banburying temperature to 80-100°C and the banburying time to 3-5 minutes to obtain a mixed rubber; then banburying the mixed rubber, rubber protective wax, antioxidant, cyclohexane oil, white carbon black, polyethylene glycol PEG4000, diethylene glycol, stearic acid, zinc oxide and silane coupling agent, setting the banburying temperature to 80-100°C and the banburying time to 4-6 minutes to obtain the banburyed base rubber.

[0047] Based on the above embodiment, in step S3, the base rubber, sulfur, urea ester BK, accelerator ZBEC, accelerator TBBS and accelerator ZDDP after banburying are banburying, and the banburying temperature is set to 85-105° C. and the banburying time is 3-5 minutes to obtain a mixture I.

[0048] On the basis of the above embodiment, in step S4, the mixture I is put into the open mill for refining, the roller temperature of the open mill is set to 70-80°C, the roller distance is 1.5-2.5 mm, and the rubber is turned over 3 times to obtain the mixture II.

[0049] On the basis of the above embodiment, in step S5, the vulcanization temperature is 130° C., and the vulcanization time is (TC90+2) min, wherein TC90 represents the time when the torque reaches (ML+90%(MH-ML)), and (TC90+2) represents the time when the torque reaches (ML+90%(MH-ML)) plus 2 min. Therefore, compared with the vulcanization of traditional rubber, the vulcanization of the rubber in this embodiment can be achieved at 130° C., thereby lowering the temperature of the rubber vulcanization treatment, which is beneficial to reducing energy consumption in the preparation process of low-temperature vulcanized rubber, reducing production costs, shortening the vulcanization time, and increasing the vulcanization speed.

[0050] The third aspect of the embodiments of the present application provides an application of low-temperature vulcanized rubber in the preparation of shoe soles. The low-temperature vulcanized rubber prepared in this embodiment can be used for the rubber outsole of shoes. It not only has good physical and mechanical properties, but also can be vulcanized at a lower temperature, which is beneficial to reducing production costs. In addition, the rubber is safe and environmentally friendly, and does not pose a risk of carcinogenicity caused by nitrosamines.

[0051] In order to further explain the present invention in detail, the present invention will be further described below with reference to specific examples. Unless otherwise specified, the experimental methods used in the examples of the present invention are conventional methods; unless otherwise specified, the materials, reagents, etc. used in the examples of the present invention are all purchased from the market.

[0052] Example 1

[0053] This embodiment provides a low-temperature vulcanized rubber, which includes the following components, measured in parts by weight: 155 parts of base rubber, 1.2 parts of sulfur, 0.5 parts of urea ester BK, 0.4 parts of accelerator ZBEC, 1 part of accelerator TBBS, and 0.5 parts of accelerator ZDDP. The base rubber includes the following components: 240 parts of styrene-butadiene rubber SBR-150, 15 parts of natural rubber NR, 45 parts of butadiene rubber BR9000, 1 part of rubber protective wax, 1 part of antioxidant BHT, 63 parts of naphthenic oil KN400, 40 parts of white carbon black ZC-185, 2 parts of polyethylene glycol PEG4000, 2 parts of diethylene glycol, 1 part of stearic acid, 4 parts of zinc oxide, and 1 part of silane coupling agent Si-69.

[0054] This embodiment also provides a method for preparing the above-mentioned low-temperature vulcanized rubber, comprising the following steps:

[0055] Step S1, weighing each component by weight;

[0056] Step S2, putting styrene-butadiene rubber SBR-1502, natural rubber NR and butadiene rubber BR9000 into an internal mixer, setting the mixing temperature to 90° C. and the mixing time to 4 minutes to obtain a mixed rubber; raising the pressing device of the internal mixer, adding rubber protective wax, antioxidant BHT, naphthenic oil KN4006, white carbon black ZC-185, polyethylene glycol PEG4000, diethylene glycol, stearic acid, zinc oxide and silane coupling agent Si-69 to the mixed rubber, lowering the pressing device, setting the mixing temperature to 90° C. and the mixing time to 5 minutes to obtain a mixed base rubber;

[0057] Step S3, raising the pressing device of the internal mixer, adding sulfur, urea ester BK, accelerator ZBEC, accelerator TBBS and accelerator ZDDP to the base rubber, lowering the pressing device, setting the mixing temperature to 95° C. and the mixing time to 4 minutes, to obtain a mixture I;

[0058] Step S4, putting the mixture I into an open mill for refining, setting the roller temperature of the open mill to 75° C., the roller distance to 2.0 mm, and turning the rubber thinly for 3 times to obtain a mixture II;

[0059] Step S5, weighing mixture II according to the volume of the mold, placing mixture II into the mold, heating the mold and stabilizing the temperature at 130° C., vulcanizing the mixture II for (TC90+2) min, and naturally cooling to room temperature after demolding to obtain low-temperature vulcanized rubber.

[0060] Example 2

[0061] This embodiment provides a low-temperature vulcanized rubber, which includes the following components, measured in parts by weight: 155 parts of base rubber, 1.5 parts of sulfur, 0.75 parts of urea ester BK, 0.3 parts of accelerator ZBEC, 0.65 parts of accelerator TBBS, and 0.8 parts of accelerator ZDDP. The base rubber includes the following components: 240 parts of styrene-butadiene rubber SBR-150, 15 parts of natural rubber NR, 45 parts of butadiene rubber BR9000, 1 part of rubber protective wax, 1 part of antioxidant BHT, 63 parts of naphthenic oil KN400, 40 parts of white carbon black ZC-185, 2 parts of polyethylene glycol PEG4000, 2 parts of diethylene glycol, 1 part of stearic acid, 4 parts of zinc oxide, and 1 part of silane coupling agent Si-69.

[0062] The preparation method of the low-temperature vulcanized rubber in this embodiment is the same as that in Example 1, with the only difference being the different ratios of the components in the low-temperature vulcanized rubber.

[0063] Example 3

[0064] This embodiment provides a low-temperature vulcanized rubber, which includes the following components, measured in parts by weight: 155 parts of base rubber, 1.5 parts of sulfur, 1 part of urea ester BK, 0.2 parts of accelerator ZBEC, 0.5 parts of accelerator TBBS, and 1 part of accelerator ZDDP. The base rubber includes the following components: 240 parts of styrene-butadiene rubber SBR-150, 15 parts of natural rubber NR, 45 parts of butadiene rubber BR9000, 1 part of rubber protective wax, 1 part of antioxidant BHT, 63 parts of naphthenic oil KN400, 40 parts of white carbon black ZC-185, 2 parts of polyethylene glycol PEG4000, 2 parts of diethylene glycol, 1 part of stearic acid, 4 parts of zinc oxide, and 1 part of silane coupling agent Si-69.

[0065] The preparation method of the low-temperature vulcanized rubber in this embodiment is the same as that in Example 1, with the only difference being the different ratios of the components in the low-temperature vulcanized rubber.

[0066] Comparative Example 1

[0067] This comparative example provides a low-temperature vulcanized rubber, comprising the following components, in parts by weight: 155 parts of base rubber, 1.5 parts of sulfur, 0.3 parts of accelerator ZBEC, 0.65 parts of accelerator TBBS, and 0.8 parts of accelerator ZDDP. The components and proportions of the base rubber are the same as those of the base rubber in Example 1. That is, compared with the low-temperature vulcanized rubber in Example 2, the low-temperature vulcanized rubber in this comparative example lacks urea ester BK.

[0068] Comparative Example 2

[0069] This comparative example provides a low-temperature vulcanized rubber, comprising the following components, in parts by weight: 155 parts of base rubber, 1.5 parts of sulfur, 0.75 parts of urea ester BK, 0.65 parts of accelerator TBBS, 0.8 parts of accelerator ZDDP, and 0.3 parts of accelerator ZDBC. The components and proportions of the base rubber are the same as those of the base rubber in Example 1. That is, compared with the low-temperature vulcanized rubber in Example 2, the accelerator ZBEC is replaced with accelerator ZDBC in the low-temperature vulcanized rubber in this comparative example.

[0070] Comparative Example 3

[0071] This comparative example provides a low-temperature vulcanized rubber, comprising the following components, in parts by weight: 155 parts of base rubber, 1.5 parts of sulfur, 0.75 parts of urea ester BK, 0.3 parts of accelerator ZBEC, 0.8 parts of accelerator ZDDP, and 0.65 parts of accelerator CBS. The components and proportions of the base rubber are the same as those of the base rubber in Example 1. That is, compared with the low-temperature vulcanized rubber in Example 2, the accelerator TBBS is replaced with the accelerator CBS in the low-temperature vulcanized rubber in this comparative example.

[0072] Comparative Example 4

[0073] This comparative example provides a low-temperature vulcanized rubber, comprising the following components, in parts by weight: 155 parts of base rubber, 1.5 parts of sulfur, 0.75 parts of urea ester BK, 0.3 parts of accelerator TMTD, 0.65 parts of accelerator TBBS, and 0.8 parts of accelerator ZDDP. The components and proportions of the base rubber are the same as those of the base rubber in Example 1.

[0074] Comparative Example 5

[0075] This comparative example provides a low-temperature vulcanized rubber, comprising the following components, in parts by weight: 155 parts of base rubber, 1.5 parts of sulfur, 0.75 parts of urea ester BK, 0.3 parts of accelerator TMTM, 1 part of accelerator MBTS, and 0.5 parts of accelerator MBT. The components and proportions of the base rubber are the same as those of the base rubber in Example 1.

[0076] The effects of the low-temperature vulcanized rubber of the present application will be described below in conjunction with specific experiments and experimental results.

[0077] The low-temperature vulcanized rubber prepared using the formula of Example 1 of the present application (hereinafter referred to as Formula 1), the formula of Example 2 (hereinafter referred to as Formula 2) and the formula of Example 3 (hereinafter referred to as Formula 3) and the low-temperature vulcanized rubber prepared using the formula of Comparative Example 1 (hereinafter referred to as Formula 4), the formula of Comparative Example 2 (hereinafter referred to as Formula 5), the formula of Comparative Example 3 (hereinafter referred to as Formula 6), the formula of Comparative Example 4 (hereinafter referred to as Formula 7) and the formula of Comparative Example 5 (hereinafter referred to as Formula 8) were subjected to vulcanization performance comparison tests and mechanical property comparison tests, respectively, wherein Formulas 1 to 6 were all processed according to the preparation method in Example 1, a portion of Formulas 7 and 8 were processed according to the preparation method in Example 1, and were all vulcanized at 130°C, and another portion of Formulas 7 and 8 were processed according to the preparation method in Example 1, but were vulcanized at 165°C. After the processing of each group of formulas was completed, vulcanization performance tests and mechanical property tests were performed to obtain the results shown in Table 1.

[0078] Table 1 Test results of each group of formulas

[0079]

[0080] As can be seen from Table 1, Formulas 1 to 6 can be vulcanized normally at 130°C, but Formulas 7 and 8 cannot be vulcanized normally at 130°C. In order to further verify the effect of the low-temperature vulcanized rubber in this application, Formulas 7 and 8 are vulcanized at high temperature, that is, under the vulcanization conditions of 165°C / 10 minutes. After the vulcanization is completed, the vulcanization performance test and the mechanical property test are carried out, and the results shown in Table 2 are obtained.

[0081] Table 2 Test results of formula 7 and formula 8

[0082]

[0083]

[0084] It can be seen from Table 1 that the traditional rubber formula 7 and formula 8 cannot be vulcanized normally at 130°C, but can be vulcanized normally at a high temperature of 165°C, and formulas 1 to 6 can all be vulcanized normally at 130°C, and the mechanical properties of the low-temperature vulcanized rubber obtained by vulcanizing at 130°C using formulas 1, 2 and 3 of the rubber formula of the present application are basically the same as those of the low-temperature vulcanized rubber obtained by formula 7 and formula 8 at 165°C, indicating that the low-temperature vulcanized rubber of the present application can be vulcanized at a lower temperature while ensuring good physical and mechanical properties; and the low-temperature vulcanized rubber of formulas 4 and 5 can be vulcanized at a lower temperature. Compared with Formula 2, urea ester BK can increase the activity during the vulcanization process, which is beneficial to increase the speed of vulcanization and shorten the time of positive vulcanization TC90; compared with Formula 5 and Formula 2, ZDBC and ZBEC, which are also dithiocarbamate accelerators, have a significantly shorter scorch time TS2 of accelerator ZDBC than that of accelerator ZBEC, which significantly reduces the safety of the vulcanization operation; compared with Formula 6 and Formula 2, CBS and TBBS, which are also sulfonamide accelerators, have a shorter scorch time of accelerator CBS than that of accelerator TBBS, and the vulcanization rate of accelerator CBS at 130°C is slow, and vulcanization cannot be completed smoothly. It can be seen from the above embodiments and comparative examples that the low-temperature vulcanized rubber of the present application can achieve vulcanization at a lower temperature while ensuring that the low-temperature vulcanized rubber has good physical and mechanical properties, and the vulcanization speed is fast and the scorch time is long, which solves the problems of high processing temperature and short scorch time of vulcanized rubber and is also beneficial to reducing the production cost of vulcanized rubber.

[0085] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A low-temperature vulcanized rubber, characterized in that: The composition comprises the following components in parts by weight: 137-175 parts of base rubber, 1-2 parts of sulfur, 0.5-1 parts of urea ester, 0.2-0.4 parts of accelerator ZBEC, 0.5-1 parts of accelerator TBBS, and 0.5-1 parts of accelerator ZDDP; The base rubber includes the following components in parts by weight: 30-50 parts of styrene-butadiene rubber, 10-30 parts of natural rubber, 30-50 parts of butadiene rubber, 0.5-2 parts of rubber protective wax, 0.5-2 parts of antioxidant, 1-5 parts of naphthenic oil, 20-50 parts of white carbon black, 1-3 parts of polyethylene glycol PEG4000, 1-3 parts of diethylene glycol, 0.5-2 parts of stearic acid, 2-6 parts of zinc oxide, and 0.5-2 parts of silane coupling agent.

2. The low-temperature vulcanized rubber according to claim 1, characterized in that The low-temperature vulcanized rubber comprises the following components in parts by weight: 155 parts of base rubber, 1.5 parts of sulfur, 0.75 parts of urea ester, 0.28 parts of accelerator ZBEC, 0.65 parts of accelerator TBBS, and 0.8 parts of accelerator ZDDP.

3. The low-temperature vulcanized rubber according to claim 1, characterized in that The total weight of the styrene-butadiene rubber, the natural rubber and the butadiene rubber is 100 parts.

4. The low-temperature vulcanized rubber according to claim 1, characterized in that The base rubber includes the following components: 40 parts of styrene-butadiene rubber, 15 parts of natural rubber, 45 parts of butadiene rubber, 1 part of rubber protective wax, 1 part of antioxidant, 3 parts of naphthenic oil, 40 parts of white carbon black, 2 parts of polyethylene glycol PEG4000, 2 parts of diethylene glycol, 1 part of stearic acid, 4 parts of zinc oxide, and 1 part of silane coupling agent.

5. A method for preparing low-temperature vulcanized rubber, characterized in that: The method for preparing the low-temperature vulcanized rubber according to any one of claims 1 to 4 comprises the following steps: Weigh each component according to weight; kneading the base rubber to obtain the kneaded base rubber; The mixed base rubber, sulfur, urea ester, accelerator ZBEC, accelerator TBBS and accelerator ZDDP are mixed to obtain a mixture I; The mixture I is subjected to open refining to obtain a mixture II; The mixture II is vulcanized to obtain the low-temperature vulcanized rubber.

6. The method for preparing low-temperature vulcanized rubber according to claim 5, characterized in that: The banburying of the base rubber includes: banburying styrene-butadiene rubber, natural rubber and butadiene rubber to obtain a mixed rubber, and then banburying the mixed rubber, rubber protective wax, antioxidant, cyclohexane oil, white carbon black, polyethylene glycol PEG4000, diethylene glycol, stearic acid, zinc oxide and silane coupling agent to obtain the banburyed base rubber; wherein, when banburying the mixed rubber, the banburying temperature is set to 80-100° C. and the banburying time is set to 3-5 minutes; when banburying the base rubber, the banburying temperature is set to 80-100° C. and the banburying time is set to 4-6 minutes.

7. The method for preparing low-temperature vulcanized rubber according to claim 5, characterized in that: When the mixture I is mixed, the mixing temperature is set to 85-105° C. and the mixing time is 3-5 min. When the mixture I is mixed, the roller temperature of the mixing mill is set to 70-80° C., the roller distance is 1.5-2.5 mm, and the rubber is turned over 3 times.

8. The method for preparing low-temperature vulcanized rubber according to claim 5, characterized in that: The temperature of the vulcanization treatment is 130° C., and the time of the vulcanization treatment is (TC90+2) min.

9. Use of the low-temperature vulcanized rubber according to any one of claims 1 to 4 in the preparation of shoe soles.

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