Shock insulation support rubber composite material, preparation method thereof and shock insulation support

Abstract

The invention relates to the technical field of building shock insulation supports, and provides a shock insulation support rubber composite material, a preparation method of the shock insulation support rubber composite material and a shock insulation support. And good vertical rigidity and horizontal rigidity can be kept under the condition that the overall height of the shock insulation support is reduced. The composite material is prepared from the following components in parts by weight: 100 parts by weight of base rubber, 2-10 parts by weight of an anti-aging agent, 8-20 parts by weight of an active agent, 3-10 parts by weight of petroleum resin, 10-13 parts by weight of hardening resin, 15-32 parts by weight of a reinforcing agent, 10-20 parts by weight of a plasticizer, 1.0-2.1 parts by weight of a vulcanizing agent and 0.8-4.5 parts by weight of an accelerant.

Description

Technical Field

[0001] The present invention relates to the technical field of building seismic isolation bearings, and in particular to a seismic isolation bearing rubber composite material, a preparation method thereof, and a seismic isolation bearing. Background Art

[0002] With the advancement of society and the development of technology, as well as the increasing requirements for high-rise buildings, higher requirements are being placed on the performance and technology of seismic isolation rubber bearings. At the construction site, the higher the height of the seismic isolation bearing, the more inconvenient it is to transport the bearing and the more likely it is to cause damage to the outer skin and tearing of the rubber layer during the stress process.

[0003] See the schematic diagram of the seismic isolation bearing for details. Figure 1 , which includes a top support cover plate 1, a bottom support cover plate 4, and stiffening steel plates 2 and rubber layers 3 alternately stacked between the top and bottom support cover plates.

[0004] In the prior art, the prepared seismic isolation bearing is relatively high in overall height, which poses certain risks in construction. At the same time, the rubber layer of the bearing will increase, and the number of layers of stiffening steel plates will also increase, which greatly increases the cost.

[0005] How to reduce the height of the seismic isolation bearing while maintaining good vertical and horizontal stiffness is one of the technical difficulties that urgently needs a breakthrough in this field. Summary of the Invention

[0006] In response to the technical difficulty in reducing the height of the isolation bearing in the existing technology, the present invention provides a seismic isolation bearing rubber composite material, a preparation method thereof, and a seismic isolation bearing. The seismic isolation bearing rubber composite material of the present invention is used to prepare the seismic isolation bearing, which not only meets the requirement of 450% shear deformation, but also maintains good vertical stiffness and horizontal stiffness when the overall height of the isolation bearing is reduced, which not only facilitates the transportation and construction of the seismic isolation bearing, but also can greatly reduce the production cost.

[0007] To achieve its purpose, the present invention provides the following technical solutions:

[0008] The present invention provides a high-hardness and low-shear-modulus seismic isolation bearing rubber composite material, wherein the composite material is prepared by using the following components in parts by weight:

[0009] 100 parts by weight of base rubber,

[0010] 2-10 parts by weight of antioxidant,

[0011] 8-20 parts by weight of active agent,

[0012] 3-10 parts by weight of petroleum resin,

[0013] 10-13 parts by weight of hardening resin,

[0014] 15-32 parts by weight of reinforcing agent,

[0015] 10-20 parts by weight of plasticizer,

[0016] 1.0-2.1 parts by weight of vulcanizing agent,

[0017] 0.8-4.5 parts by weight of accelerator;

[0018] The hardening resin is composed of a tall oil-modified thermoplastic phenol-formaldehyde resin and a pre-dispersed powder, and the weight ratio of the tall oil-modified thermoplastic phenol-formaldehyde resin to the pre-dispersed powder is 1.5-2.5; the pre-dispersed powder is purchased from Shanghai Changyu Chemical Co., Ltd. and is branded Altermix HMMM-70PD.

[0019] The inventors have discovered that in the above-mentioned isolation bearing rubber composite material, tall oil-modified thermoplastic phenol-formaldehyde resin and the above-mentioned pre-dispersed powder are used in combination, and the total weight and total amount ratio of the two are controlled within the above-mentioned range. When used in conjunction with other components in the formulation system, a high-hardness, low-shear-modulus isolation bearing rubber composite material can be obtained. Moreover, when the composite material is used as the rubber layer in the isolation bearing, the height of the isolation bearing can be reduced while maintaining good vertical and horizontal stiffness; thereby, the amount of rubber layer and steel plate used can be reduced, thereby reducing costs.

[0020] Preferably, the total weight of the tall oil modified thermoplastic phenol-formaldehyde resin and the pre-dispersed powder is 11-13 parts by weight, and the weight ratio of the tall oil modified thermoplastic phenol-formaldehyde resin to the pre-dispersed powder is 1.8-2.2.

[0021] Preferably, the base rubber is a combination of natural rubber and styrene-butadiene rubber, wherein the amount of the natural rubber is 50-80 parts by weight, and the amount of the styrene-butadiene rubber is 30-40 parts by weight.

[0022] In some embodiments, the antioxidant is selected from one or more of antioxidant 4020 (N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine), antioxidant 4010Na (N-isopropyl-N'-phenyl-p-phenylenediamine), and antioxidant D (N-phenyl-2-naphthylamine);

[0023] In some embodiments, the activator is selected from zinc oxide and stearic acid; preferably, the weight ratio of zinc oxide to stearic acid is (4.5-5.3): (3.0-3.4).

[0024] In some embodiments, the petroleum resin is selected from one or more of coumarone resin, C5 petroleum resin, C9 petroleum resin, phenolic resin, and vinyl resin.

[0025] In some embodiments, the reinforcing agent is carbon black; preferably, the reinforcing agent is selected from one or more of carbon black N774 and carbon black N330; further preferably, the reinforcing agent is a combination of carbon black N774 and carbon black N330 in a weight ratio of (5.2-3.4): (0.8-1.3).

[0026] In some embodiments, the plasticizer is pine tar;

[0027] In some embodiments, the vulcanizing agent is sulfur;

[0028] In some embodiments, the accelerator is selected from one or more of accelerators CZ (N-cyclohexyl-2-benzothiazole sulfenamide), M (2-mercaptobenzothiazole), DM (dibenzothiazyl disulfide), TMTD (tetramethylthiuram disulfide), and DTDM (4,4′-dimorpholine disulfide).

[0029] In some embodiments, the seismic isolation bearing rubber composite material further comprises 3-5 parts by weight of an antiozonant, specifically, CTU or the like.

[0030] Furthermore, the tall oil modified thermoplastic phenol-formaldehyde resin was purchased from Shanghai Changyu Chemical Co., Ltd. with the brand name ST-2101.

[0031] Unless otherwise specified, all components of the seismic isolation bearing rubber composite material of the present invention may be made of corresponding commercially available raw materials.

[0032] The present invention also provides a method for preparing the above-mentioned seismic isolation bearing rubber composite material, comprising the following steps: masticating a base rubber, for example, first masticating natural rubber for about 50-70 seconds, then adding styrene-butadiene rubber and continuing to masticate for about 20-30 seconds, then mixing the masticated base rubber with the remaining components except the vulcanizing agent, and then adding the vulcanizing agent for vulcanization;

[0033] Preferably, the mixing includes the following steps: mixing the plasticized base rubber with the antioxidant, the active agent, the petroleum resin, the hardening resin, and the accelerator in a first stage, and an antiozonant may be added during the first stage of mixing, for example, the first stage of mixing is about 80-240s; then adding the reinforcing agent and the plasticizer for a second stage of mixing, for example, the second stage of mixing is carried out at about 100-130°C for 210-360s, and then the rubber is discharged to obtain a section of rubber; then the section of rubber is mixed with the vulcanizing agent for vulcanization, for example, vulcanization is carried out at 135±5°C.

[0034] The present invention further provides a seismic isolation bearing comprising alternatingly stacked stiffening steel plates and rubber layers, wherein the rubber layers are made of the seismic isolation bearing rubber composite material described above or prepared using the preparation method described above. Specifically, the seismic isolation bearing can have a structure corresponding to conventional seismic isolation bearings in the art, and there are no particular limitations thereon, and no detailed description is provided herein; the key point is that the rubber layers are made of the seismic isolation bearing rubber composite material provided above by the present invention.

[0035] The technical solution provided by the present invention has the following beneficial effects:

[0036] The isolation bearing rubber composite material of the present invention is used to prepare the isolation bearing, which can meet the requirement of 450% shear deformation and maintain good vertical stiffness and horizontal stiffness when the overall height of the isolation bearing is greatly reduced. It not only facilitates the transportation and construction of the isolation bearing, but also can greatly reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a height diagram of the seismic isolation bearing in a comparative example;

[0038] Figure 2 Schematic diagram of the height of the seismic isolation support in one embodiment. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present invention, the present invention will be further described below in conjunction with examples. It should be understood that the following examples are only for a better understanding of the present invention and do not mean that the present invention is limited to the following examples.

[0040] Where specific experimental steps or conditions are not specified in the examples, the corresponding conventional experimental steps or conditions in the art can be used. Reagents or instruments used without specifying the manufacturer are all commercially available conventional products.

[0041] The raw materials used in the examples and comparative examples are described as follows:

[0042] Natural rubber: SCR WF, Yunnan Natural Rubber Industry Group Xishuangbanna Sunny Co., Ltd. Mengla Rubber Factory)

[0043] Styrene butadiene rubber: 1712, Sinopec;

[0044] Antioxidant: Antioxidant 4020 (N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, Shandong Shengao Chemical Technology Co., Ltd.);

[0045] Antiozonant: CTU, Hebei Ronghao Chemical Co., Ltd.

[0046] Petroleum resin: C5 petroleum resin, Sinopec;

[0047] ST-2101: tall oil-modified thermoplastic phenol-formaldehyde resin, purchased from Shanghai Changyu Chemical Co., Ltd.

[0048] Altermix HMMM-70PD (hereinafter referred to as "HMMM"): 67% hexamethylenetetramine pre-dispersed powder, purchased from Shanghai Changyu Chemical Co., Ltd.

[0049] R206: reinforcing and hardening resin, Laifu Ruiguang Rubber Additive Factory;

[0050] RSP6701: reinforcing and hardening resin, Guangzhou Liben Rubber Trading Co., Ltd.

[0051] Carbon black N774: Longxing Chemical;

[0052] Carbon black N330: Longxing Chemical;

[0053] Accelerator CZ: N-cyclohexyl-2-benzothiazolesulfenamide, Tianjin First Chemical Co., Ltd.;

[0054] Accelerator DM: dibenzothiazyl disulfide, Tianjin First Chemical Co., Ltd.

[0055] Example 1

[0056] The raw material formula of the seismic isolation bearing rubber composite material includes, by weight:

[0057] 70 parts of natural rubber, 30 parts of styrene-butadiene rubber (1712), 4 parts of antioxidant (4020), 10 parts of activator (zinc oxide and stearic acid in a weight ratio of 5.1:3.2), 3 parts of antiozonant, 3 parts of petroleum resin, 12 parts of hardening resin (including 8 parts of ST-2101 and 4 parts of HMMM), 24 parts of carbon black N774, 6 parts of carbon black N330, 10 parts of pine tar, 2.8 parts of accelerator (CZ and DM in a weight ratio of 4.2:0.3), and 1.2 parts of sulfur.

[0058] The steps for preparing the seismic isolation bearing rubber composite material include:

[0059] 1) Mastinate the natural rubber for about 50-70 seconds, then add the styrene-butadiene rubber and continue to masticate for about 20-30 seconds;

[0060] 2) Add antioxidant, active agent, accelerator, antiozonant, petroleum resin and hardening resin and mix them for 80-100 seconds;

[0061] 4) Add carbon black N774, carbon black N330 and pine tar and mix at about 105°C for 240-300s, then discharge the glue, thin it and then cut it into sheets;

[0062] 5) Mix the obtained rubber compound with sulfur and vulcanize it at 135±5°C.

[0063] Example 2

[0064] The same method was used as in Example 1, except that the amount of hardening resin was 10 parts, of which ST-2101 was 7.1 parts and HMMM was 2.9 parts.

[0065] Comparative Example 0

[0066] The same method was used as in Example 1, except that the amount of hardening resin used was 14 parts, of which ST-2101 was 9.4 parts and HMMM was 4.6 parts.

[0067] Comparative Example 1

[0068] The same method is carried out with reference to Example 1, except that the amount of the hardening resin is 10 parts, and the hardening resin is a combination of 7 parts by weight of R206 and 3 parts by weight of HMMM.

[0069] Comparative Example 2

[0070] The same method was carried out with reference to Example 1, except that the amount of the hardening resin was 12 parts by weight, and the hardening resin was a combination of 8 parts by weight of RSP6701 and 4 parts by weight of HMMM.

[0071] Comparative Example 3

[0072] The same method was used as in Example 1, except that the amount of hardening resin was 15 parts by weight, of which ST-2101 was 10 parts by weight and HMMM was 5 parts by weight.

[0073] Comparative Example 4

[0074] The same method was used as in Example 1, except that the amount of hardening resin was 8 parts by weight, of which ST-2101 was 5.4 parts by weight and HMMM was 2.6 parts by weight.

[0075] Comparative Example 5 (Prior Art)

[0076] The raw material formula of the seismic isolation bearing rubber composite material includes, by weight:

[0077] 70 parts of natural rubber, 30 parts of styrene-butadiene rubber (1712), 4 parts of antioxidant (4020), 10 parts of activator (zinc oxide and stearic acid in a weight ratio of 5.1:3.2), 3 parts of antiozonant, 3 parts of petroleum resin, 28 parts of carbon black N774, 7 parts of carbon black N330, 10 parts of pine tar, 2.8 parts of accelerator (CZ and DM in a weight ratio of 4.2:0.3), and 1.2 parts of sulfur.

[0078] The preparation steps were carried out with reference to Example 1.

[0079] The composite materials prepared in the above examples and comparative examples were subjected to performance tests, and the results are shown in Table 1.

[0080] Table 1

[0081]

[0082] The results in Table 1 show that the embodiments of the present invention can meet the requirements of GB / T 20688.3, ​​with a tensile strength of ≥ 14 MPa and an elongation of ≥ 650%. The elongations of Comparative Examples 0, 1, 2, and 3 do not meet the requirements.

[0083] The composite material obtained in Example 1 was used as a rubber layer to make a seismic isolation bearing to examine its application performance. Figure 2 , wherein the rubber layer and the stiffening steel plate are alternately stacked. The other embodiments and comparative examples all refer to Example 1 to make the composite material as the rubber layer into the seismic isolation bearing. The performance test results of the seismic isolation bearings prepared in Examples 1-2 and Comparative Examples 0-5 are shown in Table 2. Specifically, the height schematic diagram of the seismic isolation bearings prepared in Examples 1-2 and Comparative Examples 0-4 is shown in Figure 2 , the height diagram of the seismic isolation support prepared in Example 5 is shown in Figure 1 , Figure 1 、 2 The difference lies in the height of the isolation bearings.

[0084] Table 2

[0085]

[0086] As can be seen from Table 2, compared with Comparative Example 5 which adopts the prior art formula, under the premise of achieving basically equivalent vertical stiffness and horizontal stiffness, the rubber bearing height in Comparative Example 5 is 246 mm, while the embodiment of the present invention only requires 208 mm, which greatly reduces the bearing height, reduces the total thickness of the rubber layer and the total thickness of the steel plate, can significantly reduce production costs, facilitate transportation and construction, and also help save the time of the bearing in the vulcanization mold and improve production efficiency.

[0087] From the experimental results of Examples 1-2 and Comparative Examples 0-4, it can be seen that under the same condition of lower support height than that of Comparative Example 5 in the prior art, it is difficult for Comparative Examples 0-4 to obtain a seismic isolation support with a qualified shear deformation of 450%.

[0088] In Table 2, the detection method is described:

[0089] Vertical stiffness: vertical stiffness test method in GB / T20688.1;

[0090] 100% equivalent horizontal stiffness: horizontal shear test method in GB / T20688.1;

[0091] 450% shear deformation: DBJ53 / T-47-2020, if the horizontal shear displacement can reach 450% of the thickness of the bearing adhesive layer, it is considered qualified, otherwise it is unqualified.

[0092] It will be readily understood that the above embodiments are merely examples for clarity of description and are not intended to limit the present invention to these examples. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to enumerate all possible implementations here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A seismic isolation bearing rubber composite material, characterized in that: The composite material is prepared by using the following components in parts by weight: 100 parts by weight of base rubber, 2-10 parts by weight of antioxidant, 8-20 parts by weight of active agent, 3-10 parts by weight of petroleum resin, 10-13 parts by weight of hardening resin, Reinforcing agent 15-32 parts by weight, 10-20 parts by weight of plasticizer, 1.0-2.1 parts by weight of vulcanizing agent, Accelerator 0.8-4.5 parts by weight; The hardening resin is composed of a tall oil modified thermoplastic phenol-formaldehyde resin and a pre-dispersed powder, and the weight ratio of the tall oil modified thermoplastic phenol-formaldehyde resin to the pre-dispersed powder is 1.5-2.5; The pre-dispersed powder was purchased from Shanghai Changyu Chemical Co., Ltd., with the brand name Altermix HMMM-70PD.

2. The seismic isolation bearing rubber composite material according to claim 1, characterized in that: The total weight parts of the tall oil modified thermoplastic phenol-formaldehyde resin and the pre-dispersed powder is 11-13 weight parts, and the weight ratio of the tall oil modified thermoplastic phenol-formaldehyde resin to the pre-dispersed powder is 1.8-2.

2.

3. The seismic isolation bearing rubber composite material according to claim 1 or 2, characterized in that: The base rubber is a combination of natural rubber and styrene-butadiene rubber, wherein the amount of the natural rubber is 50-80 parts by weight, and the amount of the styrene-butadiene rubber is 30-40 parts by weight.

4. The seismic isolation bearing rubber composite material according to any one of claims 1 to 3, characterized in that: The antioxidant is selected from one or more of antioxidant 4020, antioxidant 4010Na, and antioxidant D; And / or, the activator is selected from zinc oxide and stearic acid; preferably, the weight ratio of zinc oxide to stearic acid is (4.5-5.3): (3.0-3.4); And / or, the petroleum resin is selected from one or more of coumarone resin, C5 petroleum resin, C9 petroleum resin, phenolic resin and vinyl resin.

5. The seismic isolation bearing rubber composite material according to any one of claims 1 to 4, characterized in that: The reinforcing agent is carbon black; Preferably, the reinforcing agent is selected from one or more of carbon black N774 and carbon black N330; Further preferably, the reinforcing agent is a combination of carbon black N774 and carbon black N330 in a weight ratio of (5.2-3.4):(0.8-1.3).

6. The seismic isolation bearing rubber composite material according to any one of claims 1 to 5, characterized in that: The plasticizer is pine tar; And / or, the vulcanizing agent is sulfur; And / or, the accelerator is selected from one or more of accelerators CZ, M, DM, TMTD, and DTDM.

7. The seismic isolation bearing rubber composite material according to any one of claims 1 to 6, characterized in that: Also included is 3-5 parts by weight of an antiozonant.

8. The seismic isolation bearing rubber composite material according to any one of claims 1 to 7, characterized in that: The tall oil modified thermoplastic phenol-formaldehyde resin was purchased from Shanghai Changyu Chemical Co., Ltd. with the brand name ST-2101.

9. The method for preparing the seismic isolation bearing rubber composite material according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: plasticizing the base rubber, mixing the plasticized base rubber with other components except the vulcanizing agent, and then adding the vulcanizing agent for vulcanization; Preferably, the mixing includes the following steps: mixing the plasticized base rubber with the antioxidant, the activator, the petroleum resin, the hardening resin and the accelerator in a first stage; then adding the reinforcing agent and the plasticizer for a second stage of mixing, followed by rubber discharge to obtain a rubber compound; and then mixing the rubber compound and the vulcanizing agent for vulcanization.

10. A seismic isolation support, comprising alternately stacked stiffening steel plates and rubber layers, characterized in that: The rubber layer is made of the seismic isolation bearing rubber composite material described in any one of claims 1 to 8 or the seismic isolation bearing rubber composite material prepared by the preparation method described in claim 9.

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