Rubber for foot pad and preparation method thereof

Abstract

The invention relates to rubber for a foot pad and a preparation method thereof. The rubber for the foot pad comprises the following raw materials in percentage by weight: 24-27% of styrene butadiene rubber SBR; 24 to 27% of butadiene rubber BR; 18-20% of white carbon black; 18-20% of nano calcium carbonate; 0.2 to 0.3 percent of zinc oxide; 0.8%-1% of stearic acid; 4-6% of a toughening agent; 0.4 to 0.5 percent of sulfur; 1 to 1.5 percent of a silane coupling agent; 0.4 to 0.5 percent of accelerant; 0.4 to 0.5 percent of a plasticizer; 1.5-2% of a release agent; and 1.7-2% of color glue. According to the rubber foot pad, on the premise that the proportion of an accelerant is not increased, a high-sulfur system and a semi-effective vulcanization system are not adopted, a composite metal oxide is not introduced and the proportion of stearic acid is not increased, the use amount of zinc oxide is reduced, and the mechanical performance of the rubber foot pad is not affected.

Description

Technical Field

[0001] This application relates to the technical field of copolymers with styrene, and specifically relates to a rubber for floor mats and a preparation method thereof. Background Art

[0002] The mechanical properties of rubber floor mats mainly include elasticity, abrasion resistance, hardness, tear strength, etc., and these properties directly affect their use effect and service life. Among them, in the rubber formulation, zinc oxide (ZnO) is a key additive, and its function and content change have a significant impact on rubber floor mats.

[0003] As a vulcanization activator, zinc oxide reacts with stearic acid to form zinc soap, which improves the vulcanization efficiency, promotes the cross-linking of sulfur and rubber molecules, shortens the vulcanization time, and can enhance the vulcanization network density and improve the mechanical properties of rubber, such as tensile strength, elasticity and tear resistance.

[0004] The conventional dosage of zinc oxide in the rubber formulation is 1-5 phr, and the content of zinc oxide in the floor mat rubber is usually 3-5 phr. Due to the high cost of zinc oxide, the raw material cost of rubber floor mats is high. In order to reduce the production cost of enterprises, the production cost of enterprises can be reduced by reducing the content of zinc oxide, but the reduction of the content of zinc oxide (ZnO) will lead to the loss of the performance of rubber floor mats. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a rubber for floor mats with low zinc oxide content and excellent mechanical properties and a preparation method thereof. The technical solutions adopted include:

[0006] A rubber for floor mats, the raw materials of which include, by weight percentage:

[0007] Styrene-butadiene rubber SBR 24-27%

[0008] Butadiene rubber BR 24-27%

[0009] Silica 18-20%

[0010] Nano calcium carbonate 18-20%

[0011] Zinc oxide 0.2-0.3%

[0012] Stearic acid 0.8-1%

[0013] Toughening agent 4-6%

[0014] Sulfur 0.4-0.5%

[0015] Silane coupling agent 1-1.5%

[0016] Accelerator 0.4-0.5%

[0017] Plasticizer 0.4 - 0.5%

[0018] Release agent 1.5 - 2%

[0019] Colored glue 1.7 - 2%.

[0020] A technical solution adopted by an embodiment of the present invention to solve its technical problems is that the accelerator includes 0.2 - 0.25% of accelerator D and 0.2 - 0.25% of accelerator DM.

[0021] A technical solution adopted by an embodiment of the present invention to solve its technical problems is that the silane coupling agent is silane coupling agent Si - 69.

[0022] A technical solution adopted by an embodiment of the present invention to solve its technical problems is that the plasticizer is PEG - 4000.

[0023] A technical solution adopted by an embodiment of the present invention to solve its technical problems is that the toughening agent is HS - 68.

[0024] This application also proposes a preparation method of the rubber for the foot mat, including:

[0025] Step 1, mixing: Add styrene - butadiene rubber SBR, butadiene rubber BR, plasticizer, toughening agent, release agent, and silane coupling agent into an open mill for mixing evenly. Then add zinc oxide, stearic acid, white carbon black, and nano - calcium carbonate and continue mixing for 5 - 8 minutes. After that, add sulfur and accelerator and mix for 5 - 15 minutes, and then take out the sheet to obtain the mixed rubber.

[0026] Step 2, vulcanization: Vulcanize the mixed rubber on a vulcanizer to obtain the rubber for the foot mat.

[0027] Advantages of the present invention:

[0028] In this application, on the premise of not increasing the proportion of accelerator, not adopting a high - sulfur system and a semi - efficient vulcanization system, not introducing composite metal oxides, and not increasing the proportion of stearic acid, the dosage of zinc oxide is reduced, and the mechanical properties of the rubber foot mat are not affected. Description of the drawings

[0029] The above - mentioned and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0030] Figure 1 is an example diagram of the foot mat in the embodiment of this application. Detailed implementation manners

[0031] The terms used in the present invention, unless otherwise specified, generally have the meanings commonly understood by those of ordinary skill in the art.

[0032] The present invention will be further described in detail below with reference to specific embodiments and data. It should be understood that the embodiments are only for illustrative purposes of the present invention and do not limit the scope of the present invention in any way.

[0033] In the following embodiments, various processes and methods not described in detail are conventional methods well known in the art. The materials, reagents, devices, instruments, equipment, etc. used in the following examples can be obtained from commercial sources unless otherwise specified.

[0034] Referring to Figure 1 the shown foot mat, the present application proposes a rubber formulation for foot mats, including by weight percentage:

[0035]

[0036] For the above rubber formulation, Embodiments 1-3 of the present application are proposed, and the models and contents of the respective raw materials in Embodiments 1-3 are shown in Table 1.

[0037] Table 1

[0038]

[0039]

[0040] The rubber in Embodiments 1-3 is prepared by the following method:

[0041] Step 1, mixing: Styrene-butadiene rubber SBR, butadiene rubber BR, plasticizer, toughener, release agent, and silane coupling agent are added to an open mill and mixed evenly at 130-160 °C. Then, zinc oxide, stearic acid, white carbon black, and nano calcium carbonate are added and mixing continues for 5-8 minutes. After that, sulfur and accelerator are added and mixed for 5-15 minutes, and then the mixed rubber is taken out of the mill to obtain a mixed rubber;

[0042] Step 2, vulcanization: The mixed rubber is vulcanized on a vulcanizer, and the vulcanization conditions are 150 °C * 45 min to obtain the rubber for foot mats.

[0043] The foot mats made of the above-obtained rubber are subjected to performance tests, and the test items and results are shown in Table 2.

[0044] Table 2

[0045] Project Example 1 Example 2 Example 3 Hardness / Shore A 83 84 81 Tensile strength / (MPa) 20.5 22.3 21.8 Tear strength / (KN / m) 59 60 58

[0046] According to the test results in Table 2 above, the rubber foot mats prepared in Embodiments 1-3 of the present application have relatively excellent mechanical properties.

[0047] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations and substitutions are all included within the scope defined by the claims of this application.

Claims

1. A rubber for a foot mat, characterized in that, Its raw materials include, by weight percentage:

2. The rubber for a foot mat according to claim 1, wherein, The accelerator includes 0.2 - 0.25% of accelerator D and 0.2 - 0.25% of accelerator DM.

3. The rubber for a foot mat according to claim 1, characterized in that, The silane coupling agent is silane coupling agent Si-69.

4. The rubber for a foot mat according to claim 1, characterized in that, The plasticizer is PEG-4000.

5. The rubber for a foot mat according to claim 1, characterized in that, The toughening agent is HS-68.

6. A preparation method of rubber for a foot mat according to any one of claims 1-5, characterized in that, It includes: Step 1, mixing: Add styrene-butadiene rubber (SBR), butadiene rubber (BR), plasticizer, toughening agent, mold release agent, and silane coupling agent into an open mill and mix evenly. Then add zinc oxide, stearic acid, white carbon black, and nano calcium carbonate and continue mixing for 5 - 8 minutes. After that, add sulfur and accelerator and mix for 5 - 15 minutes, and then take out the sheet to obtain the mixed rubber. Step 2, vulcanization: Vulcanize the mixed rubber on a vulcanizer to obtain the rubber for the foot mat.

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