Rubber material and application thereof, plate-type rubber support and preparation method and application thereof

Abstract

The invention belongs to the technical field of bridge supports, and particularly relates to a rubber material and application thereof, a plate-type rubber support and a preparation method and application thereof. The rubber material provided by the invention comprises 200 parts of ethylene propylene diene monomer, 2-6 parts of a rubber bonding enhancer, 10-15 parts of an activator, 2-5 parts of an anti-aging agent, 70-100 parts of a reinforcing agent, 8-15 parts of a plasticizer, 2-3 parts of an accelerant and 1.2-1.8 parts of a vulcanizing agent. The ethylene propylene diene monomer is oil-filled ethylene propylene diene monomer; the rubber adhesion enhancer is an adhesion enhancer HBZ; aCCEL EM33 is adopted as the accelerant; and the plasticizer is white factice. The rubber material disclosed by the invention is excellent in aging resistance, and is not easy to age and crack under the influence of oxygen, ozone, ultraviolet rays and external force; the obtained plate-type rubber support is good in durability, and bridge engineering quality accidents can be reduced in the service period.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge bearings, and specifically relates to rubber materials and applications thereof, plate-type rubber bearings and preparation methods and applications thereof. Background Art

[0002] Plate rubber bearings are important structural components of bridge superstructures. They are widely used in domestic bridge construction due to their simple production process, low cost, and convenient installation and later maintenance and replacement. To ensure that plate rubber bearings can function normally during the life of the bridge, in addition to meeting the basic physical and mechanical performance indicators specified in the standards, they should also have excellent durability.

[0003] However, in recent years, many bridge projects using plate rubber bearings have frequently experienced quality accidents, and the durability and service life of plate rubber bearings have attracted more and more attention.

[0004] The service life of the plate rubber bearing mainly depends on the durability of the rubber matrix in the plate rubber bearing. The rubber matrix will age and crack under the influence of oxygen, ozone, ultraviolet rays and external forces. Eventually, the aging of the rubber matrix will cause the performance of the plate rubber bearing to decline or even be destroyed. Summary of the invention

[0005] The purpose of the present invention is to provide a rubber material and its application, a plate-type rubber bearing and its preparation method and application. The rubber material provided by the present invention has excellent aging resistance and is not prone to aging and cracking under the influence of oxygen, ozone, ultraviolet rays and external forces; the plate-type rubber bearing obtained therefrom has good durability and can reduce the occurrence of bridge engineering quality accidents during service.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: The present invention provides a rubber material comprising the following components in parts by weight: 200 parts of EPDM rubber, 2-6 parts of rubber adhesion enhancer, 10-15 parts of activator, 2-5 parts of antioxidant, 70-100 parts of reinforcing agent, 8-15 parts of plasticizer, 2-3 parts of accelerator, 1.2-1.8 parts of vulcanizer; The EPDM rubber is an oil-filled EPDM rubber, the third monomer of the EPDM rubber is ENB, the mass content of the third monomer in the EPDM rubber is 3-5%, and the mass content of ethylene is 70-75%; the rubber adhesion enhancer is adhesion enhancer HBZ; the accelerator is ACCEL EM33; and the plasticizer is white oil paste.

[0007] Preferably, the oil filling amount of the EPDM rubber is 100%; The activator comprises zinc oxide and stearic acid; the mass ratio of zinc oxide to stearic acid is 1.5:1 to 3:1; The antioxidant is an amine antioxidant; The reinforcing agent is carbon black N330.

[0008] Preferably, the active ingredient in the white ointment is a thioester compound, the mass content of the thioester compound in the white ointment is ≥99%, and the mass content of free sulfur is ≤3%; The vulcanizing agent includes sulfur and 4,4'-dithiodimorpholine (DTDM).

[0009] The present invention provides the application of the rubber material described in the above technical solution in a plate-type rubber bearing.

[0010] The present invention provides a plate-type rubber bearing, comprising a rubber matrix and a plurality of stiffening steel plates dispersedly arranged in the rubber matrix, wherein the stiffening steel plates are parallel to the bottom surface of the rubber matrix; the rubber matrix is ​​the rubber material described in the above technical solution.

[0011] The present invention provides a method for preparing the plate-type rubber bearing described in the above technical solution, comprising the following steps: Preparing a final mixed rubber from the various components of the rubber material; Adhesive is applied to both surfaces of the stiffened steel plate to obtain a glue-stiffened steel plate; The rubber reinforcement steel plates and the rubber sheets of the final mixed rubber are alternately stacked and arranged to obtain a molded body; The molded body is vulcanized to obtain the plate-type rubber bearing.

[0012] Preferably, the adhesive is a double-coat adhesive; the stiffening steel plate base coat is Pruton 813, and the base coat thickness is 8-12 μm; the stiffening steel plate top coat is Pruton 828, and the top coat thickness is 15-25 μm.

[0013] Preferably, the method for preparing the final mixed rubber comprises the following steps: Premixing the EPDM rubber to obtain premixed EPDM rubber; The premixed EPDM rubber and the rubber adhesion enhancer are mixed in the first stage, and then an activator and an antioxidant are added to mix in the second stage, and then a reinforcing agent and a plasticizer are added to mix in the third stage, and then the rubber is discharged and the rubber is mixed to obtain a first-stage mixed rubber; The first-stage rubber mix is ​​allowed to stand at room temperature and then mixed with an accelerator and a vulcanizing agent to obtain a final rubber mix.

[0014] Preferably, the vulcanization temperature is 140-150° C., the pressure is 8-10 MPa, and the time is 6-12 h.

[0015] The present invention provides the application of the plate-type rubber bearing described in the above technical solution or the plate-type rubber bearing prepared by the preparation method described in the above technical solution in bridge engineering.

[0016] The invention provides a rubber material, comprising the following components in parts by mass: 200 parts of EPDM rubber, 2-6 parts of a rubber adhesion enhancer, 10-15 parts of an activator, 2-5 parts of an antioxidant, 70-100 parts of a reinforcing agent, 8-15 parts of a plasticizer, 2-3 parts of an accelerator, and 1.2-1.8 parts of a vulcanizer; the EPDM rubber is an oil-filled EPDM rubber, the third monomer of the EPDM rubber is ENB, the mass content of the third monomer in the EPDM rubber is 3-5%, and the mass content of ethylene is 70-75%; the rubber adhesion enhancer is an adhesion enhancer HBZ; the accelerator is ACCEL EM33; and the plasticizer is white oil paste. The rubber component used in the rubber material provided by the present invention is an oil-filled EPDM rubber, and the mass content of the third monomer ENB in ​​the EPDM rubber is strictly controlled to be 3-5%, and the mass content of ethylene is 70-75%, so that the rubber component in the present invention can have good aging resistance such as ozone resistance, heat resistance, weather resistance, etc., and at the same time have a faster vulcanization speed and lower compression permanent deformation. In the present invention, the plasticizer is white oil paste. The plasticizer in the present invention is selected from white oil paste, which can promote the reinforcement component to be evenly dispersed in the rubber material system, and the white oil paste has the characteristics of sunlight resistance and ozone cracking resistance, which can further improve the aging resistance of the rubber material. In the present invention, the accelerator is ACCEL EM33; in the vulcanization system of the present invention, ACCEL EM33 is used as an accelerator, and the cross-linking bonds that can be generated are mainly disulfide bonds and monosulfide bonds, which can effectively improve the high temperature aging resistance of the rubber material and reduce the constant compression permanent deformation. The rubber bonding enhancer is the bonding enhancer HBZ. The bonding enhancer HBZ used in the present invention has the dual effects of bonding and strengthening. Since the bonding performance of EPDM rubber is extremely poor, the bonding enhancer HBZ can effectively improve the bonding strength between the rubber material and the stiffening steel plate in the present invention, thereby improving the durability of the plate-type rubber bearing. In summary, the present invention synergistically compounds the EPDM rubber with the above-mentioned performance with the rubber bonding enhancer, activator, antioxidant, reinforcing agent, plasticizer, accelerator and vulcanizer according to the above-mentioned mass fractions, and the obtained rubber material has excellent aging resistance and is not prone to aging and cracking under the influence of oxygen, ozone, ultraviolet rays and external forces; the plate-type rubber bearing obtained therefrom has good durability and can reduce the occurrence of bridge engineering quality accidents during service.

[0017] Furthermore, in the present invention, the adhesive coated on both surfaces of the stiffening steel plate is a double-coated adhesive of the Pulitong brand; the base coating model of the stiffening steel plate is 813, and the top coating model is 828, which can still ensure good bonding between the EPDM rubber and the stiffening steel plate after vulcanization. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of the plate-type rubber bearing provided by the present invention; Figure 1 Middle: 1 is the stiffening steel plate, 2 is the rubber matrix. DETAILED DESCRIPTION

[0019] The present invention provides a rubber material comprising the following components in parts by weight: 200 parts of EPDM rubber, 2-6 parts of rubber adhesion enhancer, 10-15 parts of activator, 2-5 parts of antioxidant, 70-100 parts of reinforcing agent, 8-15 parts of plasticizer, 2-3 parts of accelerator, 1.2-1.8 parts of vulcanizer; The EPDM rubber is an oil-filled EPDM rubber, the third monomer of the EPDM rubber is ENB, the mass content of the third monomer in the EPDM rubber is 3-5%, and the mass content of ethylene is 70-75%; the rubber adhesion enhancer is adhesion enhancer HBZ; the accelerator is ACCEL EM33; and the plasticizer is white oil paste.

[0020] In the present invention, unless otherwise specified, all preparation raw materials / components are commercially available products well known to those skilled in the art.

[0021] In terms of parts by mass, the rubber material provided by the present invention includes 200 parts of ethylene propylene diene monomer (EPDM). In the present invention, the EPDM is an oil-filled EPDM. The third monomer of the EPDM is ENB. The mass content of the third monomer in the EPDM is 3-5%, specifically 3%, 3.5%, 4%, 4.5% or 5% in the embodiment, and the mass content of ethylene in the EPDM is 70-75%, specifically 70%, 71%, 72%, 73%, 74% or 75% in the embodiment. The oil filling amount of the EPDM is preferably 100%.

[0022] Based on the mass fraction of the EPDM rubber, the rubber material provided by the present invention includes 2 to 6 parts of a rubber adhesion enhancer, specifically 2 parts, 3 parts, 4 parts, 5 parts or 6 parts in the embodiment. In the present invention, the rubber adhesion enhancer is an adhesion enhancer HBZ. The manufacturer of the adhesion enhancer HBZ is Jiaozuo Huabang Additive Co., Ltd.

[0023] Based on the mass fraction of the EPDM rubber, the rubber material provided by the present invention includes 10 to 15 parts of an activator, and specifically 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts in the embodiment. In the present invention, the activator preferably includes zinc oxide and stearic acid. The mass ratio of the zinc oxide to stearic acid is preferably 1.5:1 to 3:1, and specifically 1.5:1, 3:1 or 2:1 in the embodiment. In the present invention, the zinc oxide and stearic acid are synergistically compounded to help improve the hardness, strength, heat resistance and weather resistance of rubber products.

[0024] Based on the mass fraction of the EPDM rubber, the rubber material provided by the present invention includes 2 to 5 parts of an antioxidant, specifically 2 parts, 2.5 parts, 3 parts, 4 parts or 5 parts in the embodiment. In the present invention, the antioxidant is preferably an amine antioxidant, more preferably one or more of antioxidant RD, antioxidant 4010NA and antioxidant 4020, specifically antioxidant RD, antioxidant 4010NA or antioxidant 4020 in the embodiment.

[0025] Based on the mass fraction of the EPDM rubber, the rubber material provided by the present invention includes 70 to 100 parts of a reinforcing agent, specifically 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, 95 parts or 100 parts in the embodiment. In the present invention, the reinforcing agent is carbon black N330.

[0026] Based on the mass fraction of the EPDM rubber, the rubber material provided by the present invention comprises 8 to 15 parts of a plasticizer, and in the embodiments, the plasticizer is specifically 8, 9, 10, 11, 12, 13, 14 or 15 parts. In the present invention, the plasticizer is a white oil paste, and the active ingredient in the white oil paste is a thioester compound, and the mass content of the thioester compound in the white oil paste is ≥99%, and the mass content of free sulfur is ≤3%.

[0027] Based on the mass fraction of the EPDM rubber, the rubber material provided by the present invention includes 2 to 3 parts of an accelerator, specifically 2 parts, 2.5 parts or 3 parts in the embodiment. In the present invention, the accelerator is ACCEL EM33.

[0028] Based on the mass fraction of the EPDM rubber, the rubber material provided by the present invention includes 1.2 to 1.8 parts of a vulcanizing agent, and specifically 1.2, 1.3, 1.4, 1.5, 1.6, 1.7 or 1.8 parts in the embodiment. In the present invention, the vulcanizing agent preferably includes sulfur and 4,4'-dithiodimorpholine (DTDM). The mass ratio of the sulfur to the DTDM is preferably 1:2 to 1:3, and specifically 1:2 in the embodiment. In the present invention, the present invention preferably uses sulfur and DTDM as vulcanizing agents, and controls the mass ratio of the two, which can not only increase the vulcanization speed of the rubber, but also increase the content of monosulfide bonds and disulfide bonds in the vulcanized rubber, thereby improving the aging resistance of the rubber material.

[0029] The present invention provides the application of the rubber material described in the above technical solution in a plate-type rubber bearing.

[0030] The present invention provides a plate-type rubber bearing, comprising a rubber matrix and a plurality of stiffening steel plates dispersedly arranged in the rubber matrix, wherein the stiffening steel plates are parallel to the bottom surface of the rubber matrix; the rubber matrix is ​​the rubber material described in the above technical solution.

[0031] The structural formula of the plate type rubber bearing provided by the present invention is as follows Figure 1 As shown, the plate-type rubber bearing provided by the present invention includes a rubber matrix, and the rubber matrix is ​​the rubber material described in the above technical solution. The rubber matrix is ​​formed by vulcanizing multiple layers of rubber material. The plate-type rubber bearing provided by the present invention includes a plurality of stiffening steel plates dispersedly arranged in the rubber matrix. There are a plurality of stiffening steel plates, and the plurality of stiffening steel plates are parallel to each other. The stiffening steel plates are parallel to the bottom surface of the rubber matrix.

[0032] The present invention provides a method for preparing the plate-type rubber bearing described in the above technical solution, comprising the following steps: Preparing a final mixed rubber from the various components of the rubber material; Adhesive is applied to both surfaces of the stiffened steel plate to obtain a glue-stiffened steel plate; The rubber reinforcement steel plates and the rubber sheets of the final mixed rubber are alternately stacked and arranged to obtain a molded body; The molded body is vulcanized to obtain the plate-type rubber bearing.

[0033] The invention prepares the final mixed rubber from the components of the rubber material.

[0034] In the present invention, the preparation method of the final mixing rubber comprises the following steps: Premixing the EPDM rubber to obtain premixed EPDM rubber; The premixed EPDM rubber and the rubber adhesion enhancer are mixed in the first stage, and then an activator and an antioxidant are added to mix in the second stage, and then a reinforcing agent and a plasticizer are added to mix in the third stage, and then the rubber is discharged and the rubber is mixed to obtain a first-stage mixed rubber; The first-stage rubber mix is ​​allowed to stand at room temperature and then mixed with an accelerator and a vulcanizing agent to obtain a final rubber mix.

[0035] The present invention premixes the EPDM rubber to obtain premixed EPDM rubber. In the present invention, the premixing is performed in an internal mixer, and the premixing time is preferably 40 to 80 seconds.

[0036] After obtaining the premixed EPDM rubber, the present invention performs the first stage mixing of the premixed EPDM rubber and the rubber adhesion enhancer, then adds the activator and the antioxidant for the second stage mixing, then adds the reinforcing agent and the plasticizer for the third stage mixing, degumming and Broadpass in sequence to obtain a mixed rubber. In the present invention, the time of the first stage mixing is preferably 30 to 50 seconds. The time of the second stage mixing is until the temperature of the mixed material is heated to 80 to 90°C. The time of the third stage mixing is until the temperature of the mixed material is heated to 150 to 160°C. The first stage mixing, the second stage mixing and the third stage mixing are all carried out in an internal mixer. The present invention has no special requirements for the specific implementation process of the degumming, the thin pass is carried out on an open mill, the number of the thin pass is preferably 1 to 3 times, and the roller distance of the open mill during the thin pass is preferably 1 to 2 mm.

[0037] After obtaining a first-stage rubber mix, the present invention allows the first-stage rubber mix to stand at room temperature and then mixes it with an accelerator and a vulcanizing agent to obtain a final mixed rubber mix. In the present invention, the standing time is preferably 8 to 16 hours. The mixing is performed in an internal mixer.

[0038] The present invention coats the two surfaces of the stiffened steel plate with adhesive to obtain a cloth-adhesive stiffened steel plate. In the present invention, the adhesive is preferably a double-coated adhesive, and in the embodiment, it is a double-coated adhesive of the brand of Pulitong. The primer of the stiffened steel plate is preferably Pulitong 813, and the primer thickness is preferably 8-12μm, and in the embodiment, it is specifically 8μm, 9μm, 10μm or 12μm; the topcoat of the stiffened steel plate is preferably Pulitong 828, and the topcoat thickness is preferably 15-25μm, and in the embodiment, it is specifically 15μm, 17μm, 18μm, 20μm, 22μm or 25μm.

[0039] After obtaining the final mixed rubber and the rubber cloth stiffening steel plate, the present invention arranges the rubber cloth stiffening steel plate and the rubber sheets of the final mixed rubber in alternating layers to obtain a molded body. In the present invention, the alternating layers are specifically: from bottom to top, the rubber sheets of the final mixed rubber, the rubber cloth stiffening steel plate, the rubber sheets of the final mixed rubber, the rubber cloth stiffening steel plate, the rubber sheets of the final mixed rubber, the rubber cloth stiffening steel plate, ..., the rubber cloth stiffening steel plate, the rubber sheets of the final mixed rubber are arranged in sequence. In the present invention, when the alternating layers are arranged, the edges (the bottom layer and the top layer) are all the rubber sheets of the final mixed rubber, and the rubber cloth stiffening steel plate is wrapped inside the rubber sheets of the final mixed rubber.

[0040] After obtaining the molded body, the present invention vulcanizes the molded body to obtain the plate-type rubber bearing. In the present invention, the vulcanization is preferably performed on a flat vulcanizer. The vulcanization is preferably pressurized hot vulcanization; the vulcanization temperature is preferably 140-150°C, specifically 140°C, 145°C or 150°C in the embodiment, the pressure is preferably 8-10MPa, specifically 8MPa, 9MPa or 10MPa in the embodiment, and the time is preferably 6-12h, specifically 7h, 8h or 9h in the embodiment.

[0041] The present invention provides the application of the plate-type rubber bearing described in the above technical solution or the plate-type rubber bearing prepared by the preparation method described in the above technical solution in bridge engineering. The present invention has no special requirements on the specific implementation of the application.

[0042] In order to further illustrate the present invention, the technical solutions provided by the present invention are described in detail below in conjunction with embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0043] The structural schematic diagram of the plate-type rubber bearing prepared in the following embodiments and comparative examples is as follows: Figure 1 shown.

[0044] Example 1 The present invention provides a method for preparing a durable plate-type rubber bearing, comprising the following steps: The first step is mixing 200 parts by weight of oil-filled EPDM rubber (oil filling amount is 100%, the third monomer is ENB, the mass content of the third monomer is 5%, and the mass content of ethylene is 70%) are mixed in an internal mixer for 45 seconds, and then 2 parts by weight of rubber adhesion enhancer HBZ are added. After mixing for 35 seconds, 6 parts by weight of zinc oxide, 4 parts by weight of stearic acid, and 3 parts by weight of antioxidant RD are added in sequence, and the mixture is mixed until the temperature rises to 85°C, and then 100 parts by weight of carbon black N330 and 15 parts by weight of white oil paste (active ingredient content ≥99%, free sulfur content ≤3%) are added. When the temperature rises to 160°C, the rubber is discharged, and the mixture is thinly passed 3 times on an open mixer with a roller distance of 2mm to obtain a mixed rubber. After standing at room temperature for 12 hours, a mixed rubber is added to an internal mixer, 3 parts by weight of accelerator ACCEL EM33, 0.4 parts by weight of sulfur, and 0.8 parts by weight of DTDM are added, and the final mixed rubber is obtained after mixing evenly.

[0045] Second step: vulcanization Adhesive is applied on the stiffened steel plate after shot blasting and rust removal. The primer is Pruton 813 with a coating thickness of 12μm, and the top coating is Pruton 828 with a coating thickness of 17μm. The stiffened steel plates after gluing and the rubber sheets obtained in the first step are alternately stacked (rubber sheets, stiffened steel plates after gluing, rubber sheets, stiffened steel plates after gluing, ..., stiffened steel plates after gluing, rubber sheets are arranged from bottom to top), and hot vulcanized on a flat vulcanizer with pressure at 145°C, a vulcanization pressure of 10MPa, and a vulcanization time of 8h.

[0046] Example 2 The present embodiment provides a method for preparing a durable plate-type rubber bearing, comprising the following steps: The first step is mixing 200 parts by weight of oil-filled EPDM rubber (oil filling amount is 100%, the third monomer is ENB, the mass content of the third monomer is 4.5%, and the mass content of ethylene is 71.5%) are mixed in an internal mixer for 80 seconds, and then 6 parts by weight of rubber adhesion enhancer HBZ are added. After mixing for 50 seconds, 9 parts by weight of zinc oxide, 3 parts by weight of stearic acid, and 2.5 parts by weight of antioxidant 4010NA are added in sequence, and the mixture is mixed until the temperature rises to 90°C, and then 85 parts by weight of carbon black N330 and 10 parts by weight of white oil paste (active ingredient content ≥99%, free sulfur content ≤3%) are added. When the temperature rises to 150-160°C, the rubber is discharged, and the mixture is thinly passed through an open mixer once with a roller distance of 1 mm to obtain a mixed rubber. After standing at room temperature for 8 hours, a mixed rubber is added to an internal mixer, 2.5 parts by weight of accelerator ACCELEM33, 0.5 parts by weight of sulfur, and 1.0 parts by weight of DTDM are added, and the final mixed rubber is obtained after mixing evenly.

[0047] Second step: vulcanization Adhesive is applied on the stiffened steel plate after shot blasting and rust removal. The primer is Pruton 813 with a coating thickness of 9μm, and the top coating is Pruton 828 with a coating thickness of 20μm. The stiffened steel plates after gluing and the rubber sheets obtained in the first step are alternately stacked (rubber sheets, stiffened steel plates after gluing, rubber sheets, stiffened steel plates after gluing, ..., stiffened steel plates after gluing, rubber sheets are arranged from bottom to top), and the plates are pressurized and heated for vulcanization on a flat vulcanizer. The vulcanization temperature is 150°C, the vulcanization pressure is 8-10MPa, and the vulcanization time is 9h.

[0048] Example 3 The present embodiment provides a method for preparing a durable plate-type rubber bearing, comprising the following steps: The first step is mixing 200 parts by weight of oil-filled EPDM rubber (oil filling amount is 100%, the third monomer is ENB, the mass content of the third monomer is 3%, and the mass content of ethylene is 72%) are mixed in an internal mixer for 60 seconds, and then 6 parts by weight of rubber adhesion enhancer HBZ are added. After mixing for 45 seconds, 10 parts by weight of zinc oxide, 5 parts by weight of stearic acid, and 5 parts by weight of antioxidant 4020 are added in sequence, and the mixture is mixed until the temperature rises to 90°C, and then 70 parts by weight of carbon black N330 and 10 parts by weight of white oil paste (active ingredient content ≥99%, free sulfur content ≤3%) are added. When the temperature rises to 150°C, the rubber is discharged, and the mixture is thinly passed twice on an open mixer with a roller distance of 1.5 mm to obtain a mixed rubber. After standing at room temperature for 10 hours, the mixed rubber is put into an internal mixer, 2 parts by weight of accelerator ACCEL EM33, 0.6 parts by weight of sulfur, and 1.2 parts by weight of DTDM are added, and the final mixed rubber is obtained after mixing evenly.

[0049] Second step: vulcanization Adhesive is applied on the stiffened steel plate after shot blasting and rust removal. The primer is Pruton 813 with a coating thickness of 10μm, and the top coating is Pruton 828 with a coating thickness of 18μm. The stiffened steel plates after gluing and the rubber sheets obtained in the first step are alternately stacked (rubber sheets, stiffened steel plates after gluing, rubber sheets, stiffened steel plates after gluing, ..., stiffened steel plates after gluing, rubber sheets are arranged from bottom to top), and hot vulcanized on a flat vulcanizer with pressure at 140°C, a vulcanization pressure of 8MPa, and a vulcanization time of 7h.

[0050] Comparative Example 1 (basically the same as Example 3, except that no adhesive (rubber adhesion enhancer HBZ) was added) The first step is mixing 200 parts by weight of oil-filled EPDM rubber (oil filling amount is 100%, the third monomer is ENB, the mass content of the third monomer is 3%, and the mass content of ethylene is 72%) are mixed in an internal mixer for 60 seconds, and then 10 parts by weight of zinc oxide, 5 parts by weight of stearic acid, and 5 parts by weight of antioxidant 4020 are added in sequence, and the mixture is mixed until the temperature rises to 90°C, and then 70 parts by weight of carbon black N330 and 10 parts by weight of white oil paste (active ingredient content ≥99%, free sulfur content ≤3%) are added. When the temperature rises to 150°C, the rubber is discharged, and the mixture is thinly passed twice on an open mixer with a roller distance of 1.5 mm to obtain a mixed rubber. After standing at room temperature for 10 hours, the mixed rubber is put into an internal mixer, 2 parts by weight of accelerator ACCEL EM33, 0.6 parts by weight of sulfur, and 1.2 parts by weight of DTDM are added, and the final mixed rubber is obtained after being mixed evenly.

[0051] Second step: vulcanization Adhesive is applied on the stiffened steel plate after shot blasting and rust removal. The primer is Pruton 813 with a coating thickness of 10μm, and the top coating is Pruton 828 with a coating thickness of 18μm. The stiffened steel plates after gluing and the rubber sheets obtained in the first step are alternately stacked (rubber sheets, stiffened steel plates after gluing, rubber sheets, stiffened steel plates after gluing, ..., stiffened steel plates after gluing, rubber sheets are arranged from bottom to top), and hot vulcanized on a flat vulcanizer with pressure at 140°C, a vulcanization pressure of 8MPa, and a vulcanization time of 7h.

[0052] Comparative Example 2 (basically the same as Example 3, except that the accelerator ACCEL EM33 is not added) The first step is mixing 200 parts by weight of oil-filled EPDM rubber (oil filling amount is 100%, the third monomer is ENB, the mass content of the third monomer is 3%, and the mass content of ethylene is 72%) are mixed in an internal mixer for 60 seconds, and then 6 parts by weight of rubber adhesion enhancer HBZ are added. After mixing for 45 seconds, 10 parts by weight of zinc oxide, 5 parts by weight of stearic acid, and 5 parts by weight of antioxidant 4020 are added in sequence, and the mixture is mixed until the temperature rises to 90°C, and then 70 parts by weight of carbon black N330 and 10 parts by weight of white oil paste (active ingredient content ≥99%, free sulfur content ≤3%) are added. When the temperature rises to 150°C, the rubber is discharged, and the mixture is thinly passed twice on an open mixer with a roller distance of 1.5 mm to obtain a mixed rubber. After standing at room temperature for 10 hours, the mixed rubber is put into an internal mixer, 0.6 parts by weight of accelerator TMTD, 1 part by weight of accelerator BZ, 1.2 parts by weight of accelerator DM and 1.2 parts by weight of sulfur are added, and the final mixed rubber is obtained after mixing evenly.

[0053] Second step: vulcanization Adhesive is applied on the stiffened steel plate after shot blasting and rust removal. The primer is Pruton 813 with a coating thickness of 10μm, and the top coating is Pruton 828 with a coating thickness of 18μm. The stiffened steel plates after gluing and the rubber sheets obtained in the first step are alternately stacked (rubber sheets, stiffened steel plates after gluing, rubber sheets, stiffened steel plates after gluing, ..., stiffened steel plates after gluing, rubber sheets are arranged from bottom to top), and hot vulcanized on a flat vulcanizer with pressure at 140°C, a vulcanization pressure of 8MPa, and a vulcanization time of 7h.

[0054] Comparative Example 3 (basically the same as Example 3, except that the type of adhesive used for the stiffening steel plate is changed) This comparative example provides a method for preparing a durable plate-type rubber bearing, comprising the following steps: The first step is mixing 200 parts by weight of oil-filled EPDM rubber (oil filling amount is 100%, the third monomer is ENB, the mass content of the third monomer is 3%, and the mass content of ethylene is 72%) are mixed in an internal mixer for 60 seconds, and then 6 parts by weight of rubber adhesion enhancer HBZ are added. After mixing for 45 seconds, 10 parts by weight of zinc oxide, 5 parts by weight of stearic acid, and 5 parts by weight of antioxidant 4020 are added in sequence, and the mixture is mixed until the temperature rises to 90°C, and then 70 parts by weight of carbon black N330 and 10 parts by weight of white oil paste (active ingredient content ≥99%, free sulfur content ≤3%) are added. When the temperature rises to 150°C, the rubber is discharged, and the mixture is thinly passed twice on an open mixer with a roller distance of 1.5 mm to obtain a mixed rubber. After standing at room temperature for 10 hours, the mixed rubber is put into an internal mixer, 2 parts by weight of accelerator ACCEL EM33, 0.6 parts by weight of sulfur, and 1.2 parts by weight of DTDM are added, and the final mixed rubber is obtained after mixing evenly.

[0055] Second step: vulcanization Adhesive is applied on the stiffening steel plate after shot blasting and rust removal. Chemlock 252X is used as the adhesive for the primer and top coat. The thickness of the primer and top coat is 20 μm. The stiffening steel plates and rubber sheets are alternately stacked (rubber sheet, stiffening steel plate after glue coating, rubber sheet, stiffening steel plate after glue coating, ..., stiffening steel plate after glue coating, rubber sheet are arranged from bottom to top). Pressurized hot vulcanization is performed on a flat vulcanizer. The vulcanization temperature is 140°C, the vulcanization pressure is 8 MPa, and the vulcanization time is 8 h.

[0056] Comparative Example 4 (Current method for preparing rubber bearings, using natural rubber as raw material) The first step is mixing 100 parts by mass of natural rubber were mixed in an internal mixer for 56 seconds, and 5 parts by mass of zinc oxide, 2 parts by mass of stearic acid, 2.5 parts by mass of antioxidant RD, 2.5 parts by mass of antioxidant 4010NA, 2.5 parts by mass of antioxidant 4020 and 2 parts by mass of protective wax were added in sequence; 50 parts by mass of carbon black N330 and 10 parts by mass of plasticizer paraffin oil were added, and the rubber was discharged when the temperature rose to 140°C; After standing at room temperature for 13 hours, 1.6 parts by mass of sulfur, 0.6 parts by mass of accelerator benzothiazole disulfide and 1.0 parts by mass of accelerator CZ were added into an internal mixer and mixed evenly to obtain a rubber compound.

[0057] Second step: vulcanization Adhesive is applied on the stiffening steel plate after shot blasting and rust removal. The adhesive used for the primer and top coat is Prudent 838. The coating thickness of the primer and top coat is 20μm. The stiffening steel plates and rubber sheets are stacked alternately (rubber sheet, stiffening steel plate after glue coating, rubber sheet, stiffening steel plate after glue coating, ..., stiffening steel plate after glue coating, rubber sheet are arranged from bottom to top) and hot vulcanized on a flat vulcanizer under pressure. The vulcanization temperature is 145℃, the vulcanization pressure is 8.5MPa, and the vulcanization time is 5h.

[0058] Comparative Example 5 (basically the same as Example 3, except that the EPDM grade is EPDM 8550C) The present embodiment provides a method for preparing a durable plate-type rubber bearing, comprising the following steps: The first step is mixing 100 parts by weight of EPDM 8550C (non-oil-filled rubber, the third monomer is ENB, the mass content of the third monomer is 5.4%, and the mass content of ethylene is 48.9%) are mixed in an internal mixer for 60 seconds, and then 6 parts by weight of rubber adhesion enhancer HBZ are added. After mixing for 45 seconds, 10 parts by weight of zinc oxide, 5 parts by weight of stearic acid, and 5 parts by weight of antioxidant 4020 are added in sequence, and the mixture is mixed until the temperature rises to 90°C, and then 70 parts by weight of carbon black N330 and 40 parts by weight of white oil paste (active ingredient content ≥99%, free sulfur content ≤3%) are added. When the temperature rises to 150°C, the rubber is discharged, and the mixture is thinly passed twice on an open mixer with a roller distance of 1.5 mm to obtain a mixed rubber. After standing at room temperature for 10 hours, the mixed rubber is put into an internal mixer, 2 parts by weight of accelerator ACCEL EM33, 0.6 parts by weight of sulfur, and 1.2 parts by weight of DTDM are added, and the final mixed rubber is obtained after mixing evenly.

[0059] Second step: vulcanization Adhesive is applied on the stiffened steel plate after shot blasting and rust removal. The primer is Pruton 813 with a coating thickness of 10μm, and the top coating is Pruton 828 with a coating thickness of 18μm. The stiffened steel plate after glue coating and the rubber sheet obtained in the first step are stacked alternately (rubber sheet, stiffened steel plate after glue coating, rubber sheet, stiffened steel plate after glue coating, ..., stiffened steel plate after glue coating, rubber sheet are arranged from bottom to top), and hot vulcanization is performed on a flat vulcanizer under pressure. The vulcanization temperature is 140℃, the vulcanization pressure is 8MPa, and the vulcanization time is 7h.

[0060] Comparative Example 6 The preparation method is basically the same as that of Example 3, except that paraffin oil is used as the plasticizer.

[0061] The preparation method of a durable plate-type rubber bearing provided in this comparative example comprises the following steps: The first step is mixing 200 parts by weight of oil-filled EPDM rubber (oil filling amount is 100%, the third monomer is ENB, the mass content of the third monomer is 3%, and the mass content of ethylene is 72%) are mixed in an internal mixer for 60 seconds, and then 6 parts by weight of rubber adhesion enhancer HBZ are added. After mixing for 45 seconds, 10 parts by weight of zinc oxide, 5 parts by weight of stearic acid, and 5 parts by weight of antioxidant 4020 are added in sequence, and the mixture is mixed until the temperature rises to 90°C, and then 70 parts by weight of carbon black N330 and 10 parts by weight of paraffin oil are added. When the temperature rises to 150°C, the rubber is discharged, and the mixture is thinly passed twice on an open mixer with a roller distance of 1.5 mm to obtain a mixed rubber. After standing at room temperature for 10 hours, the mixed rubber is put into an internal mixer, 2 parts by weight of accelerator ACCEL EM33, 0.6 parts by weight of sulfur, and 1.2 parts by weight of DTDM are added, and the final mixed rubber is obtained after mixing evenly.

[0062] Second step: vulcanization Adhesive is applied on the stiffened steel plate after shot blasting and rust removal. The primer is Pruton 813 with a coating thickness of 10μm, and the top coating is Pruton 828 with a coating thickness of 18μm. The stiffened steel plate after glue coating and the rubber sheet obtained in the first step are stacked alternately (rubber sheet, stiffened steel plate after glue coating, rubber sheet, stiffened steel plate after glue coating, ..., stiffened steel plate after glue coating, rubber sheet are arranged from bottom to top), and hot vulcanization is performed on a flat vulcanizer under pressure. The vulcanization temperature is 140℃, the vulcanization pressure is 8MPa, and the vulcanization time is 7h.

[0063] Test Case The performance of the plate rubber bearings prepared in the above embodiments and comparative examples was tested according to the "Test Method of the Present Invention" in Table 1, wherein the test conditions used in the present invention are more stringent than those in "Plate Rubber Bearings for Highway Bridges" (JT / T4-2019). The specific comparison is shown in Table 1.

[0064] Table 1 Test method for the performance of plate rubber bearings

[0065] The test results of the performance of the plate rubber bearing prepared in the above embodiments and comparative examples are shown in Table 2. In Table 2, the tensile strength, hot air aging, ozone aging, rubber-steel plate bonding strength and constant compression permanent deformation test the rubber properties of the plate rubber bearing, and the shear elastic modulus change rate after aging test the performance of the plate rubber bearing. Among them, the tensile strength is tested according to GB / T528 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber"; hot air aging is tested according to GB / T3512 "Hot air accelerated aging and heat resistance test of vulcanized rubber or thermoplastic rubber"; ozone aging is tested according to GB / T 7762 "Static tensile test of ozone cracking resistance of vulcanized rubber or thermoplastic rubber"; constant compression permanent deformation (70℃×24 hours) is tested according to GB / T 7759.1 "Determination of compression permanent deformation of vulcanized rubber or thermoplastic rubber Part 1: Under normal and high temperature conditions".

[0066] Table 2 Properties of rubber products prepared in Examples and Comparative Examples

[0067] As can be seen from Table 2, the hot air aging resistance and ozone resistance of the rubber material in the present invention are significantly improved. Compared with the commonly used natural rubber (Comparative Example 3), the elongation at break and the tensile strength of the rubber material in the present invention after aging are significantly reduced after the aging test, and the compression permanent deformation performance is also improved.

[0068] From the above embodiments, it can be seen that the rubber component used in the rubber material provided by the present invention is an oil-filled EPDM rubber, and the mass content of the third monomer ENB in ​​the EPDM rubber is strictly controlled to be 3-5%, and the mass content of ethylene is 70-75%, so that the rubber component in the present invention has good aging resistance such as ozone resistance, heat resistance, weather resistance, etc., and at the same time has a faster vulcanization speed and lower compression permanent deformation; the present invention synergistically compounded the EPDM rubber with the above-mentioned properties with a rubber adhesion enhancer, an activator, an antioxidant, a reinforcing agent, a plasticizer, a accelerator and a vulcanizing agent according to the above-mentioned mass fractions, and the obtained rubber material has excellent aging resistance and is not prone to aging cracking under the influence of oxygen, ozone, ultraviolet rays and external forces; the plate rubber bearing obtained therefrom has good durability and can reduce the occurrence of bridge engineering quality accidents during service.

[0069] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A rubber material, characterized in that: The composition includes the following components in parts by weight: 200 parts of EPDM rubber, 2-6 parts of rubber adhesion enhancer, 10-15 parts of activator, 2-5 parts of antioxidant, 70-100 parts of reinforcing agent, 8-15 parts of plasticizer, 2-3 parts of accelerator, 1.2-1.8 parts of vulcanizer; The EPDM rubber is an oil-filled EPDM rubber, the third monomer of the EPDM rubber is ENB, the mass content of the third monomer in the EPDM rubber is 3-5%, and the mass content of ethylene is 70-75%; the rubber adhesion enhancer is adhesion enhancer HBZ; the accelerator is ACCEL EM33; and the plasticizer is white oil paste.

2. The rubber material according to claim 1, characterized in that: The oil filling amount of the EPDM rubber is 100%; The activator comprises zinc oxide and stearic acid; the mass ratio of zinc oxide to stearic acid is 1.5:1 to 3:1; The antioxidant is an amine antioxidant; The reinforcing agent is carbon black N330.

3. The rubber material according to claim 1 or 2, characterized in that: The active ingredient in the white ointment is a thioester compound, the mass content of the thioester compound in the white ointment is ≥99%, and the mass content of free sulfur is ≤3%; The vulcanizing agent includes sulfur and 4,4'-dithiodimorpholine.

4. Use of the rubber material according to any one of claims 1 to 3 in a plate-type rubber bearing.

5. A plate-type rubber bearing, characterized in that: It comprises a rubber matrix and a plurality of stiffening steel plates dispersedly arranged in the rubber matrix, wherein the stiffening steel plates are parallel to the bottom surface of the rubber matrix; the rubber matrix is ​​the rubber material according to any one of claims 1 to 3.

6. The method for preparing the plate-type rubber bearing according to claim 5, characterized in that: The following steps are involved: Preparing a final mixed rubber from the various components of the rubber material; Adhesive is applied to both surfaces of the stiffened steel plate to obtain a glue-stiffened steel plate; The rubber reinforcement steel plates and the rubber sheets of the final mixed rubber are alternately stacked and arranged to obtain a molded body; The molded body is vulcanized to obtain the plate-type rubber bearing.

7. The preparation method according to claim 6, characterized in that: The adhesive is a double-coating adhesive; the base coating of the stiffening steel plate is Pruton 813, and the base coating thickness is 8-12 μm; the top coating of the stiffening steel plate is Pruton 828, and the top coating thickness is 15-25 μm.

8. The preparation method according to claim 6, characterized in that: The preparation method of the final mixing rubber comprises the following steps: Premixing the EPDM rubber to obtain premixed EPDM rubber; The premixed EPDM rubber and the rubber adhesion enhancer are mixed in the first stage, and then an activator and an antioxidant are added to mix in the second stage, and then a reinforcing agent and a plasticizer are added to mix in the third stage, and then the rubber is discharged and the rubber is mixed to obtain a first-stage mixed rubber; The first-stage rubber mix is ​​allowed to stand at room temperature and then mixed with an accelerator and a vulcanizing agent to obtain a final rubber mix.

9. The preparation method according to claim 6, characterized in that: The vulcanization temperature is 140-150° C., the pressure is 8-10 MPa, and the time is 6-12 hours.

10. Application of the plate rubber bearing according to claim 5 or the plate rubber bearing prepared by the preparation method according to any one of claims 6 to 9 in bridge engineering.

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