Seawater corrosion resistant rubber support

Abstract

The invention relates to the technical field of high polymer materials, and provides a seawater corrosion-resistant rubber support which comprises steel plate layers and rubber layers which are alternately laminated and compounded, the rubber layer comprises the following components in parts by weight: 45-50 parts of ethylene propylene diene monomer, 25-35 parts of chloroprene rubber, 5-8 parts of polypropylene, 3-5 parts of a compatilizer, 2-4 parts of a vulcanizing agent, 1-3 parts of an active agent, 1-2 parts of an accelerant, 0.5-1.5 parts of an anti-aging agent and 6-12 parts of a corrosion-resistant system; the corrosion-resistant system comprises the following components in parts by weight: 5-10 parts of flaky filler, 2-5 parts of needle-like wollastonite and 1-3 parts of zinc benzoate. By means of the technical scheme, the problem that in the prior art, a rubber support is poor in seawater corrosion resistance is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymer materials, in particular to a rubber support resistant to seawater corrosion. BACKGROUND

[0002] In bridge, cross-sea building and other engineering structures, rubber supports become core support components due to their excellent elastic shock absorption and load transmission performance. However, in coastal and cross-sea engineering scenarios, the rubber layer of traditional rubber supports is in long-term contact with seawater medium, and the defect of insufficient corrosion resistance is increasingly prominent.

[0003] High-concentration chloride ions, sulfate ions and marine microorganisms contained in seawater systems are prone to chemical reactions with components such as cross-linking agents and reinforcing fillers in the rubber matrix, destroying the cross-linking network of the rubber molecular chain, and at the same time causing swelling, aging and cracking of the rubber surface. The existing technology mainly improves the weather resistance by adding a single antioxidant or modifying the filler, but does not specifically solve the problem of the synergistic effect of seawater ion corrosion and microbial degradation, resulting in mechanical property degradation, sealing failure and other faults of the rubber layer in seawater immersion conditions in a short period of time, which not only reduces the service life of the support, but also threatens the stability and safety of the entire engineering structure. Therefore, it is necessary to develop a rubber support that is suitable for marine environment and has excellent seawater corrosion resistance. SUMMARY

[0004] The present application provides a rubber support resistant to seawater corrosion, which solves the problem of poor seawater corrosion resistance of the rubber support in the related art.

[0005] The technical scheme of the present application is as follows: The present application provides a rubber support resistant to seawater corrosion, which includes a steel plate layer and a rubber layer alternately stacked and combined. The rubber layer includes the following components by weight: 45-50 parts of ethylene-propylene-diene rubber, 25-35 parts of chloroprene rubber, 5-8 parts of polypropylene, 3-5 parts of a compatibilizer, 2-4 parts of a vulcanizing agent, 1-3 parts of an active agent, 1-2 parts of a promoter, 0.5-1.5 parts of an antioxidant, and 6-12 parts of a corrosion-resistant system. The corrosion-resistant system includes the following components by weight: 5-10 parts of flaky filler, 2-5 parts of acicular wollastonite, and 1-3 parts of zinc benzoate.

[0006] As a further technical scheme, the flaky filler includes one or both of flaky graphite and mica flakes.

[0007] As a further technical scheme, the acicular wollastonite includes one or more of acicular wollastonite I, acicular wollastonite II, and acicular wollastonite III. The length of the acicular wollastonite I is 60 μm, and the diameter is 4.7 μm. The length of the needle-shaped wollastonite II is 150-160 mu m, and the diameter is 8-12 mu m. The length of the needle-shaped wollastonite III is 120 mu m, and the diameter is 15 mu m.

[0008] As a further technical solution, the needle-shaped wollastonite includes needle-shaped wollastonite I, needle-shaped wollastonite II and needle-shaped wollastonite III.

[0009] As a further technical solution, the mass ratio of the needle-shaped wollastonite I, the needle-shaped wollastonite II and the needle-shaped wollastonite III is 3:2:1-5.

[0010] In the corrosion-resistant system of the application, the needle-shaped wollastonite includes needle-shaped wollastonite I, needle-shaped wollastonite II and needle-shaped wollastonite III, which further improves the seawater corrosion resistance of the rubber support, the needle-shaped wollastonite I realizes fine filling and micro stress dispersion, the needle-shaped wollastonite II realizes reinforcing network construction and adsorption and slow release, the needle-shaped wollastonite III realizes macroscopic support and performance adjustment, and the synergistic effect of the barrier effect of the flaky filler and the protection effect of zinc benzoate is optimal, the diffusion path of the corrosion medium is prolonged, the permeation rate is reduced, and the seawater corrosion resistance of the rubber support is comprehensively improved.

[0011] As a further technical solution, the flaky filler has a flaky diameter of 40-50 mu m.

[0012] As a further technical solution, the vulcanizing agent includes a peroxide.

[0013] As a further technical solution, the compatibilizer includes one or more of ethylene-vinyl acetate copolymer, maleic anhydride grafted polypropylene and SEBS.

[0014] As a further technical solution, the anti-aging agent includes a hindered phenolic anti-aging agent and a phosphite anti-aging agent.

[0015] The application further provides a preparation method of the seawater corrosion-resistant rubber support. The components of the rubber layer are mixed to obtain a mixed rubber; The steel plate and the mixed rubber are alternately stacked and compounded, and vulcanized to obtain the rubber support.

[0016] The working principle and beneficial effects of the application are as follows: In the present application, the flaky filler, the acicular wollastonite and the zinc benzoate are used as the corrosion-resistant system of the rubber layer of the rubber support, which significantly improves the corrosion resistance of the rubber support. The flaky filler in the corrosion-resistant system forms a barrier structure to block the invasion of the corrosion medium, the acicular wollastonite fills and enhances the rubber structure, and absorbs and neutralizes harmful substances, and the zinc benzoate inhibits the oxidation and aging of the rubber, and the three are synergistic, which comprehensively improves the corrosion resistance of the rubber support. Compared with the rubber support protected by the traditional corrosion-resistant system, the rubber support of the present application can better resist the erosion of seawater and other corrosion media in the bridge construction in the coastal area, prolong the service life of the rubber support, reduce the maintenance cost of the bridge, and ensure the safety and stability of the bridge structure. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] In the following examples and comparative examples, the type of ethylene-propylene-diene rubber is 3720P (American Dow), the type of chloroprene rubber is CR244 (Huojiazhonghua), and the type of polypropylene is X101A.

[0019] Example 1 The seawater corrosion-resistant rubber support comprises alternately laminated steel plate layers and rubber layers. The rubber layer comprises the following components in parts by weight: 45 parts of ethylene-propylene-diene rubber, 25 parts of chloroprene rubber, 5 parts of polypropylene, 2 parts of ethylene-vinyl acetate copolymer, 1 part of maleic anhydride grafted polypropylene, 2 parts of dicumyl peroxide, 1 part of stearic acid, 1 part of accelerator CZ, 0.2 parts of antioxidant 626, 0.3 parts of antioxidant BHT, and 6 parts of a corrosion-resistant system. The corrosion-resistant system comprises the following components in parts by weight: 5 parts of flaky graphite (flake diameter of 40 μm), 2 parts of acicular wollastonite (150 μm, diameter of 8 μm), and 1 part of zinc benzoate.

[0020] The preparation method of the seawater corrosion-resistant rubber support comprises the following steps: The components of the rubber layer are mixed to obtain a rubber compound. The steel plate and the rubber compound are alternately laminated and compounded, and vulcanized to obtain the rubber support.

[0021] Example 2 The seawater corrosion-resistant rubber support comprises alternately laminated steel plate layers and rubber layers. The rubber layer comprises the following components by weight: 50 parts of ethylene-propylene-diene rubber, 35 parts of chloroprene rubber, 8 parts of polypropylene, 2 parts of SEBS, 3 parts of maleic anhydride grafted polypropylene, 4 parts of dicumyl peroxide, 3 parts of stearic acid, 2 parts of accelerator CZ, 1 part of antioxidant 626, 0.5 part of antioxidant BHT, and 12 parts of a corrosion-resistant system. The corrosion-resistant system comprises the following components by weight: 10 parts of flaky graphite (flake diameter of 50 μm), 5 parts of acicular wollastonite (160 μm, diameter of 10 μm), and 3 parts of zinc benzoate.

[0022] The method for preparing the seawater corrosion-resistant rubber support comprises the following steps: The components of the rubber layer are mixed to obtain a rubber compound; The steel plate and the rubber compound are alternately stacked and compounded, and vulcanized to obtain the rubber support.

[0023] Example 3 The seawater corrosion-resistant rubber support comprises alternately stacked and compounded steel plate layers and rubber layers. The rubber layer comprises the following components by weight: 47 parts of ethylene-propylene-diene rubber, 30 parts of chloroprene rubber, 6 parts of polypropylene, 2 parts of ethylene-vinyl acetate copolymer, 2 parts of maleic anhydride grafted polypropylene, 3 parts of dicumyl peroxide, 2 parts of stearic acid, 1 part of accelerator CZ, 0.5 part of antioxidant 626, 0.5 part of antioxidant BHT, and 10 parts of a corrosion-resistant system. The corrosion-resistant system comprises the following components by weight: 8 parts of flaky graphite (flake diameter of 45 μm), 4 parts of acicular wollastonite (120 μm, diameter of 15 μm), and 2 parts of zinc benzoate.

[0024] The method for preparing the seawater corrosion-resistant rubber support comprises the following steps: The components of the rubber layer are mixed to obtain a rubber compound; The steel plate and the rubber compound are alternately stacked and compounded, and vulcanized to obtain the rubber support.

[0025] Example 4 The difference between this example and Example 3 is that the acicular wollastonite (120 μm, diameter of 15 μm) is replaced by acicular wollastonite (length of 60 μm, diameter of 4.7 μm).

[0026] Example 5 The difference between this example and Example 3 is that the acicular wollastonite (120 μm, diameter of 15 μm) is replaced by acicular wollastonite (length of 160 μm, diameter of 12 μm).

[0027] Example 6 The difference between this example and Example 3 is that the wollastonite (length 60 μm, diameter 4.7 μm) is replaced by a composite wollastonite; the composite wollastonite is a mass ratio of 3:2 of wollastonite I (length 60 μm, diameter 4.7 μm), wollastonite II (length 160 μm, diameter 12 μm).

[0028] Example 7 The difference between this example and Example 3 is that the wollastonite (length 60 μm, diameter 4.7 μm) is replaced by a composite wollastonite; the composite wollastonite is a mass ratio of 2:1 of wollastonite II (length 160 μm, diameter 12 μm) and wollastonite III (120 μm, diameter 15 μm).

[0029] Example 8 The difference between this example and Example 3 is that the wollastonite (length 60 μm, diameter 4.7 μm) is replaced by a composite wollastonite; the composite wollastonite is a mass ratio of 3:1 of wollastonite I (length 60 μm, diameter 4.7 μm) and wollastonite III (120 μm, diameter 15 μm).

[0030] Example 9 The difference between this example and Example 3 is that the wollastonite (length 60 μm, diameter 4.7 μm) is replaced by a composite wollastonite; the composite wollastonite is a mass ratio of 3:2:1 of wollastonite I (length 60 μm, diameter 4.7 μm), wollastonite II (length 160 μm, diameter 12 μm) and wollastonite III (120 μm, diameter 15 μm).

[0031] Example 10 The difference between this example and Example 3 is that the wollastonite (length 60 μm, diameter 4.7 μm) is replaced by a composite wollastonite; the composite wollastonite is a mass ratio of 3:2:5 of wollastonite I (length 60 μm, diameter 4.7 μm), wollastonite II (length 160 μm, diameter 12 μm) and wollastonite III (120 μm, diameter 15 μm).

[0032] Comparative Example 1 The difference between this comparative example and Example 3 is that the corrosion resistant system includes the following components in parts by weight: flaky graphite (flaky diameter 45 μm) 8 parts, zinc benzoate 2 parts.

[0033] Comparative Example 2 The difference between this comparative example and Example 3 is that the corrosion resistant system includes the following components in parts by weight: flaky graphite (flaky diameter 45 μm) 8 parts, wollastonite (120 μm, diameter 15 μm) 4 parts.

[0034] Comparative Example 3 The difference between the present comparative example and Example 3 is that the corrosion-resistant system comprises the following components by weight: acicular wollastonite (120 μm, 15 μm in diameter) 4 parts, zinc benzoate 2 parts.

[0035] The rubber layers of the rubber supports prepared in Examples 1-10 and Comparative Examples 1-3 were subjected to the seawater corrosion resistance test, respectively: The rubber layer sample was immersed in a sodium chloride solution with a concentration of 3.5 wt% for 3 days, and the tensile strength of the sample before and after immersion was tested according to the standard GB / T 528-2009 Rubber, Vulcanized or Thermoplastic - Determination of Tensile Stress-Strain Properties, the sample type was 1A dumbbell-shaped sample, and the tensile strength change rate was calculated.

[0036] The results are shown in Table 1 below.

[0037] Table 1 Performance test results

[0038] Compared with Comparative Examples 1-3, the sheet-shaped filler, acicular wollastonite and zinc benzoate are used as the corrosion-resistant system of the rubber layer of the rubber support in Examples 1-10 of the present application, and the tensile strength change rate of the rubber layer is lower, thus significantly improving the corrosion resistance of the rubber support.

[0039] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rubber bearing resistant to seawater corrosion, characterized in that, It includes alternating layers of steel plates and rubber layers; The rubber layer comprises the following components in parts by weight: 45-50 parts of EPDM rubber, 25-35 parts of chloroprene rubber, 5-8 parts of polypropylene, 3-5 parts of compatibilizer, 2-4 parts of vulcanizing agent, 1-3 parts of activator, 1-2 parts of accelerator, 0.5-1.5 parts of antioxidant, and 6-12 parts of corrosion resistant system. The corrosion-resistant system comprises the following components in parts by weight: 5-10 parts of flake filler, 2-5 parts of needle-shaped wollastonite, and 1-3 parts of zinc benzoate.

2. The seawater corrosion-resistant rubber bearing according to claim 1, characterized in that, The sheet-like filler includes one or both of sheet graphite and mica sheets.

3. The seawater corrosion-resistant rubber bearing according to claim 1, characterized in that, The acicular wollastonite includes one or more of acicular wollastonite I, acicular wollastonite II, and acicular wollastonite III; The needle-shaped wollastonite I has a length of 60 μm and a diameter of 4.7 μm; The needle-shaped wollastonite II has a length of 150~160μm and a diameter of 8~12μm; The needle-shaped wollastonite III has a length of 120 μm and a diameter of 15 μm.

4. The seawater corrosion-resistant rubber bearing according to claim 3, characterized in that, The acicular wollastonite includes acicular wollastonite I, acicular wollastonite II, and acicular wollastonite III.

5. A seawater corrosion-resistant rubber bearing according to claim 4, characterized in that, The mass ratio of acicular wollastonite I, acicular wollastonite II, and acicular wollastonite III is 3:2:1~5.

6. A seawater corrosion-resistant rubber bearing according to claim 1, characterized in that, The sheet-like filler has a sheet diameter of 40~50μm.

7. A seawater corrosion-resistant rubber bearing according to claim 1, characterized in that, The vulcanizing agent includes peroxides.

8. A seawater corrosion-resistant rubber bearing according to claim 1, characterized in that, The compatibilizer includes one or more of ethylene-vinyl acetate copolymer, maleic anhydride-grafted polypropylene, and SEBS.

9. A seawater corrosion-resistant rubber bearing according to claim 1, characterized in that, The antioxidants include hindered phenolic antioxidants and phosphite antioxidants.

10. A method for preparing a seawater corrosion-resistant rubber bearing, used to prepare the seawater corrosion-resistant rubber bearing according to any one of claims 1 to 9, characterized in that, Includes the following steps: The components of the rubber layer are mixed to obtain a compound rubber; Steel plates and rubber compound are alternately layered and vulcanized to obtain rubber bearings.

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