Low-temperature-resistant viscous material for high-altitude damper
By modifying components such as modified silicone rubber and silica, boron-terminated polyborosiloxane is formed, which solves the problem of embrittlement and adhesion failure of viscous materials at low temperatures, achieves efficient shock absorption in high-altitude areas, and meets the weather resistance requirements of a wide temperature range.
Patent Information
- Application Number
- CN202511280734.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-09
- Publication Date
- 2025-12-05
AI Technical Summary
Existing viscous materials are prone to embrittlement and adhesion failure at low temperatures, and their aging is accelerated at high altitudes due to large temperature differences, resulting in poor vibration damping performance and failing to meet the vibration damping requirements of buildings and bridges in high-altitude areas.
Using modified silicone rubber, modified silica, polar rubber and other components, boron-terminated polydimethylsiloxane is formed by boric acid-modified hydroxyl-terminated polydimethylsiloxane and hexamethyldisilazane-modified silica. Combined with phenyl silicone oil and damping agent, the dynamic viscoelasticity and interfacial bonding strength of the material are improved, ensuring that the viscosity remains stable at extremely low temperatures.
Maintaining stable viscosity within a temperature range of -50℃ to -80℃ enhances the material's damping performance and weather resistance, adapts to a wide temperature range, reduces structural impact, and meets low-maintenance requirements, making it an ideal vibration reduction solution for buildings and bridges in high-altitude areas.
Abstract
Description
Technical Field
[0001] This invention relates to the field of viscous materials technology, and more specifically, to a low-temperature viscous material for use in high-altitude dampers. Background Technology
[0002] Damping and vibration isolation technology based on viscoelastic damping materials is an effective way to control vibration, shock, and noise, especially for broadband random vibration and shock problems in high-precision equipment, where it plays an irreplaceable role. Phenyl silicone rubber possesses many excellent properties of silicone rubber, such as weather resistance, aging resistance, electrical insulation, and a wide operating temperature range, giving it advantages as a damping material that other general-purpose rubbers do not have.
[0003] However, the damping performance of phenyl silicone rubber cannot meet the actual application requirements. In order to improve its damping performance, the current technology can introduce large-volume side groups into its molecular side chains. Although this method can improve the damping performance to a certain extent, the synthesis process is complicated, the raw materials are expensive, and it is mostly reported in general academic literature, making it difficult to industrialize.
[0004] Existing technologies also report methods to improve the damping performance of phenyl silicone rubber by adding "damping agents." This involves adding small, polar organic molecules to a polymer matrix with polar side groups, utilizing the reversible interactions (such as hydrogen bonds) between the small organic molecules and polymer segments to enhance the material's damping performance. The principle is that when the material is subjected to external force, some hydrogen bonds break, while new hydrogen bonds are formed. This process consumes a significant amount of energy, thus improving the material's damping performance. However, the dynamic mechanical properties of the small organic molecules depend on their molecular weight and structure. Inappropriate selection can cause the small molecules to precipitate from the polymer, affecting the material's mechanical properties and rendering it unsuitable for practical applications.
[0005] The damping properties of viscous materials (such as silicone oil or viscoelastic polymers) are highly temperature-dependent. At low temperatures, these materials tend to enter a "glassy state," losing their viscoelasticity and resulting in weakened or absent damping. Viscoelastic materials are in a glassy state at low temperatures, exhibiting high internal friction but essentially losing their damping effect, remaining effective only in the intermediate temperature range; at high temperatures, they become rubbery, with reduced damping. Furthermore, as temperature decreases, viscosity increases, potentially leading to an excessive increase in damping force, causing the structure to bear excessive additional forces and affecting normal deformation.
[0006] Low-temperature resistant adhesive materials are prone to embrittlement and adhesion failure at low temperatures. High cross-linking density and low surface energy make it difficult for the material to bond with the substrate, leading to easy debonding; poor interfacial penetration results in the formation of a thick adhesive layer, inducing residual stress; low-temperature freezing also causes volume shrinkage and increased brittleness, reducing the ability to transmit mechanical forces. This is particularly serious in high-altitude applications, because low temperatures and large temperature differences (the diurnal temperature range at high altitudes can reach 50°C) accelerate material cracking and fatigue.
[0007] Viscous materials are prone to aging under low temperatures and temperature cycling. Viscous dampers are susceptible to aging and failure due to prolonged use or external factors (such as temperature fluctuations), and their damping effect deteriorates further with increasing temperature. It is also emphasized that there is limited research on the adhesion mechanism at low temperatures, resulting in insufficient stability. Summary of the Invention
[0008] This invention provides a low-temperature resistant viscous material for high-altitude dampers. The resulting low-temperature resistant viscous material maintains stable viscosity at extremely low temperatures (-50°C to -80°C), preventing hardening or failure due to sudden temperature drops. It improves adaptability over a wide temperature range, has efficient energy dissipation capabilities, minimal impact on the structure, and superior weather resistance, meeting low-maintenance requirements. These characteristics make viscous dampers an ideal vibration reduction solution for buildings and bridges in high-altitude areas. In particular, the silicone oil-based material has solved the low-temperature hardening problem through technological innovation.
[0009] In a first aspect, the present invention provides a low-temperature resistant viscosity material, comprising the following components: 30-50 parts of silicone rubber; 50-60 parts of modified silicone rubber; 10-30 parts of polar rubber; 20-50 parts of modified silica; 10-40 parts of high-gluten powder; 10-20 parts of crosslinking accelerator; 10-50 parts of organosilicon elastomer micro powder; 1-3 parts of diphenylsilanediol; 1-5 parts of phenyl silicone oil; 1-5 parts of damping agent; 1 to 2 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0010] Preferably, the modified silicone rubber is prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 200~250℃ and then performing a dehydration condensation reaction to obtain boron-terminated polyborosiloxane, which is then compounded with silicone rubber; the mass ratio of boron-terminated polyborosiloxane to silicone rubber is 1:3~2:5.
[0011] Preferably, the modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:2 to 1:3.
[0012] Preferably, the polar rubber includes at least one of acrylate rubber, chloroprene rubber, or nitrile rubber.
[0013] Preferably, the crosslinking accelerator is selected from at least one of N.N'-4,4'-diphenylmethane bismaleimide, diallyl terephthalate, triallyl cyanurate, triallyl isocyanate, SAC-100, and UN-7.
[0014] Preferably, the silicone rubber is a linear polydiorganosiloxane.
[0015] Preferably, the damping agent is one of 4-acetylphenylboronic acid, 4-benzyloxyphenylboronic acid, styrene-acrylate copolymer, styrene-butadiene copolymer, or polycarboborane methylsiloxane.
[0016] Preferably, the organosilicon elastomer microparticles have a particle size of 4-20 μm.
[0017] Preferably, the viscosity of the phenyl silicone oil is 20~50 CST.
[0018] Secondly, the present invention provides a low-temperature resistant viscous material for use in high-altitude dampers.
[0019] In summary, the present invention has the following beneficial effects: In this invention, the modified silicone rubber exhibits a loss factor greater than 0.3 in the high-temperature range, significantly higher than conventional damping rubber, filling a gap in high-temperature damping materials. The dynamic boron-oxygen coordination bonds (Si-O:B) formed within the silicone rubber by the boron-terminated polyborosiloxane efficiently dissipate vibrational energy. The introduction of boron-oxygen bonds in the boron-terminated polyborosiloxane significantly improves the material's thermal stability. Boron-terminated polyborosiloxane with boron hydroxyl end groups is formed through dehydration condensation of boric acid and hydroxyl-terminated polydimethylsiloxane (PDMS-OH) at 200-250℃ (silicon-boron ratio approximately 300:1). The strong hydrogen bonding between the end groups endows the material with dynamic viscoelasticity resembling a supramolecular elastomer.
[0020] 2. This invention utilizes modified silica. The hexamethyldisilazane modification in the modified silica significantly reduces its surface tension, decreases particle aggregation, and improves its dispersibility in the silicone rubber matrix. This directly reduces the viscosity of the mixture, allowing the material to maintain good fluidity at low temperatures and avoiding processing problems caused by a sharp increase in viscosity. The modified silica exhibits reduced drying loss and enhanced hydrophobicity. Combined with low-temperature resistant viscous materials, it further ensures interfacial bonding strength at low temperatures. The hexamethyldisilazane-modified silica, by reducing surface hydroxyl groups and enhancing hydrophobicity and dispersibility, provides an ideal basis for the addition of low-temperature resistant viscous materials. The synergistic effect of these two modifications significantly improves the processing fluidity of the material at low temperatures, inhibits structuring, maintains mechanical properties, and enhances production efficiency and economy.
[0021] 3. The low-temperature viscous material prepared by this invention can maintain stable viscosity at extremely low temperatures (-50℃ to -80℃), avoiding material hardening or failure due to sudden temperature drops. This improves adaptability over a wide temperature range, provides efficient energy dissipation, has minimal impact on the structure, exhibits superior weather resistance, and meets low-maintenance requirements. These characteristics make viscous dampers an ideal vibration reduction solution for buildings and bridges in high-altitude areas. In particular, the silicone oil-based material has solved the low-temperature hardening problem through technological innovation.
[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the scope of protection of the present invention. Detailed Implementation
[0023] The present invention will be further described in detail below with reference to the embodiments. It should be noted that: unless otherwise specified, the conditions in the following embodiments are carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following embodiments can be obtained from commercially available sources. Example Example 1
[0024] A low-temperature resistant viscous material, comprising the following components: 30 parts silicone rubber; 50 parts of modified silicone rubber; 10 parts polar rubber; 20 parts modified silica; 10 parts of high-gluten powder; 10 parts of crosslinking accelerator; 10 parts of organosilicon elastomer micro powder; 1 part of diphenylsilanediol; 1 part phenyl silicone oil; 1 part damping agent; 1 part of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0025] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 200℃ and then performing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 1:3.
[0026] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:2.
[0027] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0028] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0029] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0030] The particle size of the organosilicon elastomer powder is 4 μm; the viscosity of the phenyl silicone oil is 20 CST.
[0031] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 120°C to obtain a low-temperature resistant viscous material. Example 2
[0032] A low-temperature resistant viscous material, comprising the following components: 35 parts silicone rubber; 55 parts of modified silicone rubber; 10 parts polar rubber; 20 parts modified silica; 10 parts of high-gluten powder; 10 parts of crosslinking accelerator; 10 parts of organosilicon elastomer micro powder; 1 part of diphenylsilanediol; 1 part phenyl silicone oil; 1 part damping agent; 1 part of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0033] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 210℃ and then undergoing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 1:3.
[0034] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:3.
[0035] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0036] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0037] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0038] The particle size of the organosilicon elastomer powder is 5 μm; the viscosity of the phenyl silicone oil is 20 CST.
[0039] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 120°C to obtain a low-temperature resistant viscous material. Example 3
[0040] A low-temperature resistant viscous material, comprising the following components: 38 parts of silicone rubber; 56 parts of modified silicone rubber; 12 parts polar rubber; 20 parts modified silica; 10 parts of high-gluten powder; 10 parts of crosslinking accelerator; 10 parts of organosilicon elastomer micro powder; 1 part of diphenylsilanediol; 1 part phenyl silicone oil; 1 part damping agent; 1 part of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0041] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 220℃ and then performing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 1:4.
[0042] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:2.
[0043] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0044] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0045] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0046] The particle size of the organosilicon elastomer powder is 5 μm; the viscosity of the phenyl silicone oil is 20 CST.
[0047] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 120°C to obtain a low-temperature resistant viscous material. Example 4
[0048] A low-temperature resistant viscous material, comprising the following components: 40 parts silicone rubber; 50 parts of modified silicone rubber; 15 parts polar rubber; 20 parts modified silica; 10 parts of high-gluten powder; 10 parts of crosslinking accelerator; 10 parts of organosilicon elastomer micro powder; 1 part of diphenylsilanediol; 1 part phenyl silicone oil; 1 part damping agent; 1 part of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0049] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 230℃ and then undergoing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 2:3.
[0050] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:2.
[0051] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0052] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0053] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0054] The particle size of the organosilicon elastomer powder is 8 μm; the viscosity of the phenyl silicone oil is 25 CST.
[0055] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 120°C to obtain a low-temperature resistant viscous material. Example 5
[0056] A low-temperature resistant viscous material, comprising the following components: 30 parts silicone rubber; 50 parts of modified silicone rubber; 20 parts of polar rubber; 20 parts modified silica; 10 parts of high-gluten powder; 10 parts of crosslinking accelerator; 10 parts of organosilicon elastomer micro powder; 1 part of diphenylsilanediol; 1 part phenyl silicone oil; 1 part damping agent; 1 part of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0057] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 240℃ and then performing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 1:3.
[0058] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:2.
[0059] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0060] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0061] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0062] The particle size of the organosilicon elastomer powder is 5 μm; the viscosity of the phenyl silicone oil is 20 CST.
[0063] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 120°C to obtain a low-temperature resistant viscous material. Example 6
[0064] A low-temperature resistant viscous material, comprising the following components: 50 parts silicone rubber; 50 parts of modified silicone rubber; 10 parts polar rubber; 20 parts modified silica; 10 parts of high-gluten powder; 10 parts of crosslinking accelerator; 10 parts of organosilicon elastomer micro powder; 1 part of diphenylsilanediol; 1 part phenyl silicone oil; 1-5 parts of damping agent; 1 part of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0065] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 200℃ and then undergoing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 1:5.
[0066] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:2.
[0067] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0068] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0069] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0070] The particle size of the organosilicon elastomer powder is 5 μm; the viscosity of the phenyl silicone oil is 20 CST.
[0071] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 130°C to obtain a low-temperature resistant viscous material. Example 7
[0072] A low-temperature resistant viscous material, comprising the following components: 50 parts silicone rubber; 50 parts of modified silicone rubber; 10 parts polar rubber; 20 parts modified silica; 10 parts of high-gluten powder; 10 parts of crosslinking accelerator; 10 parts of organosilicon elastomer micro powder; 1 part of diphenylsilanediol; 1 part phenyl silicone oil; 1 part damping agent; 1 part of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0073] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 200℃ and then performing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 1:3.
[0074] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:2.
[0075] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0076] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0077] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0078] The particle size of the organosilicon elastomer powder is 8 μm; the viscosity of the phenyl silicone oil is 20 CST.
[0079] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 130°C to obtain a low-temperature resistant viscous material. Example 8
[0080] A low-temperature resistant viscous material, comprising the following components: 50 parts silicone rubber; 50 parts of modified silicone rubber; 30 parts of polar rubber; 20 parts modified silica; 10 parts of high-gluten powder; 10 parts of crosslinking accelerator; 10 parts of organosilicon elastomer micro powder; 1 part of diphenylsilanediol; 1 part phenyl silicone oil; 1 part damping agent; 1 part of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0081] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 200℃ and then undergoing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 2:5.
[0082] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:3.
[0083] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0084] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0085] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0086] The particle size of the organosilicon elastomer powder is 10 μm; the viscosity of the phenyl silicone oil is 30 CST.
[0087] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 150°C to obtain a low-temperature resistant viscous material. Example 9
[0088] A low-temperature resistant viscous material, comprising the following components: 50 parts silicone rubber; 50 parts of modified silicone rubber; 20 parts of polar rubber; 30 parts modified silica; 20 parts of high-gluten powder; 15 parts of crosslinking accelerator; 20 parts of organosilicon elastomer micro powder; 1 part of diphenylsilanediol; 1 part phenyl silicone oil; 1 part damping agent; 1 part of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0089] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 210℃ and then undergoing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 1:4.
[0090] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:3.
[0091] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0092] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0093] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0094] The particle size of the organosilicon elastomer powder is 12 μm; the viscosity of the phenyl silicone oil is 30 CST.
[0095] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 140°C to obtain a low-temperature resistant viscous material. Example 10
[0096] A low-temperature resistant viscous material, comprising the following components: 50 parts silicone rubber; 50 parts of modified silicone rubber; 20 parts of polar rubber; 30 parts modified silica; 20 parts of high-gluten powder; 15 parts of crosslinking accelerator; 25 parts of organosilicon elastomer micro powder; Two parts of diphenylsilanediol; 2 parts phenyl silicone oil; Two parts of damping agent; 2 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0097] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 200℃ and then performing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 1:3.
[0098] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:2.
[0099] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0100] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0101] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0102] The particle size of the organosilicon elastomer powder is 10 μm; the viscosity of the phenyl silicone oil is 20 CST.
[0103] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 120°C to obtain a low-temperature resistant viscous material. Example 11
[0104] A low-temperature resistant viscous material, comprising the following components: 40 parts silicone rubber; 60 parts of modified silicone rubber; 20 parts of polar rubber; 40 parts modified silica; 30 parts of high-gluten powder; 18 parts of crosslinking accelerator; 30 parts of organosilicon elastomer micro powder; Two parts of diphenylsilanediol; 4 parts phenyl silicone oil; 3 parts damping agent; 2 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0105] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 220℃ and then performing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 2:5.
[0106] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:2.
[0107] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0108] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0109] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0110] The particle size of the organosilicon elastomer powder is 12 μm; the viscosity of the phenyl silicone oil is 30 CST.
[0111] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 150°C to obtain a low-temperature resistant viscous material. Example 12
[0112] A low-temperature resistant viscous material, comprising the following components: 40 parts silicone rubber; 50 parts of modified silicone rubber; 30 parts of polar rubber; 40 parts modified silica; 20 parts of high-gluten powder; 10 parts of crosslinking accelerator; 50 parts of organosilicon elastomer micro powder; 3 parts of diphenylsilanediol; 5 parts phenyl silicone oil; 5 parts damping agent; 2 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0113] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 250°C and then undergoing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 2:5.
[0114] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:3.
[0115] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0116] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0117] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0118] The particle size of the organosilicon elastomer powder is 20 μm; the viscosity of the phenyl silicone oil is 50 CST.
[0119] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 150°C to obtain a low-temperature resistant viscous material. Example 13
[0120] A low-temperature resistant viscous material, comprising the following components: 45 parts silicone rubber; 55 parts of modified silicone rubber; 25 parts of polar rubber; 35 parts modified silica; 25 parts of high-gluten powder; 15 parts of crosslinking accelerator; 35 parts of organosilicon elastomer micro powder; 3 parts of diphenylsilanediol; 2 parts phenyl silicone oil; Two parts of damping agent; 2 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0121] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 200℃ and then undergoing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 1:5.
[0122] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:3.
[0123] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0124] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0125] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0126] The particle size of the organosilicon elastomer powder is 8 μm; the viscosity of the phenyl silicone oil is 25 CST.
[0127] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 140°C to obtain a low-temperature resistant viscous material. Example 14
[0128] A low-temperature resistant viscous material, comprising the following components: 50 parts silicone rubber; 55 parts of modified silicone rubber; 25 parts of polar rubber; 45 parts modified silica; 25 parts of high-gluten powder; 15 parts of crosslinking accelerator; 30 parts of organosilicon elastomer micro powder; Two parts of diphenylsilanediol; 3 parts phenyl silicone oil; Two parts of damping agent; 2 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0129] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 200℃ and then performing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 1:3.
[0130] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:2.
[0131] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0132] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0133] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0134] The particle size of the organosilicon elastomer powder is 15 μm; the viscosity of the phenyl silicone oil is 30 CST.
[0135] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 180°C to obtain a low-temperature resistant viscous material. Example 15
[0136] A low-temperature resistant viscous material, comprising the following components: 50 parts silicone rubber; 60 parts of modified silicone rubber; 30 parts of polar rubber; 50 parts modified silica; 40 parts of high-gluten powder; 20 parts of crosslinking accelerator; 50 parts of organosilicon elastomer micro powder; 3 parts of diphenylsilanediol; 5 parts phenyl silicone oil; 5 parts damping agent; 2 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.
[0137] Boron-terminated polyborosiloxane was prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 250°C and then undergoing a dehydration condensation reaction. The boron-terminated polyborosiloxane was then combined with silicone rubber to obtain the final product. The mass ratio of boron-terminated polyborosiloxane to silicone rubber was 2:5.
[0138] Modified silica is prepared by modifying silica with hexamethyldisilazane, wherein the molar ratio of hexamethyldisilazane to silica is 1:3.
[0139] Polar rubbers include acrylate rubbers and chloroprene rubbers.
[0140] The crosslinking accelerator is selected from N.N'-4,4'-diphenylmethane bismaleimide.
[0141] The silicone rubber is a linear polydiorganosiloxane; the damping agent is 4-acetylphenylboronic acid.
[0142] The particle size of the organosilicon elastomer powder is 20 μm; the viscosity of the phenyl silicone oil is 50 CST.
[0143] A method for preparing a low-temperature resistant viscous material includes the following steps: S1. A solid mixture is obtained by uniformly mixing modified silicone rubber, silicone rubber, damping agent, polar rubber, modified silica, high-rubber powder and other additives. S2. A liquid mixture is obtained by uniformly mixing organosilicon elastomer micro powder, diphenylsilanediol, phenyl silicone oil, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and crosslinking accelerator. S3. The solid mixture obtained in S1 and the liquid mixture obtained in S2 are added into the extruder through different feed ports and extruded and granulated at 200°C to obtain a low-temperature resistant viscous material.
[0144] Comparative Example 1 This comparative example provides a low-temperature resistant viscous material. The formulation differs from Example 1 in that no modified silicone rubber is added.
[0145] Comparative Example 2 This comparative example provides a low-temperature resistant viscous material. The formulation differs from that of Example 1 in that no polar rubber is added.
[0146] Comparative Example 3 This comparative example provides a low-temperature resistant viscous material. The formulation differs from Example 1 in that no modified silica is added.
[0147] Comparative Example 4 This comparative example provides a low-temperature resistant viscous material. The difference between the formulation and Example 1 is that the modified silica is replaced with ordinary silica.
[0148] Comparative Example 5 This comparative example provides a low-temperature resistant viscous material. The difference between this formulation and Example 1 is that no silicone elastomer micropowder is added.
[0149] The low-temperature resistant viscous materials prepared in Examples 1-15 and Comparative Examples 1-5 were used in high-altitude dampers.
[0150] Performance testing: 1. Damping performance: Low-temperature resistant viscous material was injection molded into a specimen and tested using a TA DMA Q800 dynamic mechanical analyzer. Test conditions: multi-frequency double cantilever beam mode, test temperature range -50℃~150℃, heating rate 2℃ / min, frequency 10Hz. The minimum value tanδmin in the test temperature range was taken to compare the damping performance. The larger the tanδ value, the more material loss and the better the damping performance. 2. High temperature and low compression resistance: The compression set of the material was tested according to GB / T 7759.1-2015 standard. The smaller the test result value, the better the elasticity of the material is maintained at high temperature and the better the high temperature resistance.
[0151] Table 1. Performance test results of the low-temperature resistant viscous materials prepared in Examples 1-15 and Comparative Examples 1-5 Tensile strength (MPa) Damping coefficient (-50℃~100℃, 10Hz) Compression set (%) Elongation at break (%) Example 1 10.8 0.65 12 720 Example 2 10.2 0.63 11 710 Example 3 10.5 0.62 11 705 Example 4 10.3 0.58 10 700 Example 5 10.0 0.60 12 680 Example 6 10.1 0.64 11 715 Example 7 10.2 0.62 10 710 Example 8 9.8 0.62 12 700 Example 9 9.9 0.65 11 705 Example 10 10.2 0.59 10 710 Example 11 10.5 0.60 9 700 Example 12 10.3 0.61 9.5 690 Example 13 10.1 0.62 9 710 Example 14 9.6 0.63 11 700 Example 15 9.8 0.60 10 720 Comparative Example 1 6 0.16 6 630 Comparative Example 2 8 0.23 7 680 Comparative Example 3 7 0.19 7 620 Comparative Example 4 6 0.22 8 650 Comparative Example 5 8 0.21 6 640 As shown in Table 1, the low-temperature viscous material prepared in this embodiment maintains stable viscosity at extremely low temperatures (-50℃ to -80℃), avoiding material hardening or failure due to sudden temperature drops. This improves adaptability over a wide temperature range, provides efficient energy dissipation, has minimal impact on the structure, exhibits superior weather resistance, and meets low-maintenance requirements. These characteristics make viscous dampers an ideal vibration reduction solution for buildings and bridges in high-altitude areas, especially since silicone oil-based materials have solved the low-temperature hardening problem through technological innovation.
[0152] The above description is merely an exemplary embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A low temperature resistant viscous material, characterized by, The low-temperature resistant viscous material comprises the following components: silicone rubber 30-50 parts; modified silicone rubber 50-60 parts; polar rubber 10-30 parts; modified white carbon black 20-50 parts; high glue powder 10-40 parts; crosslinking accelerator 10-20 parts; silicone elastomer micro powder 10-50 parts; diphenylsilanediol 1-3 parts; phenyl silicone oil 1-5 parts; damping agent 1-5 parts; 2,5-dimethyl-2,5-bis(tert-butyl peroxy) hexane 1-2 parts.
2. The low temperature resistant viscous material of claim 1, wherein The modified silicone rubber is prepared by modifying hydroxyl-terminated polydimethylsiloxane with boric acid at 200-250 DEG C, and preparing boron-terminated polysiloxane by dehydration condensation reaction, and the boron-terminated polysiloxane is compounded with silicone rubber; the mass ratio of the boron-terminated polysiloxane to the silicone rubber is 1:3-2:
5.
3. The low temperature resistant viscous material of claim 1, wherein The modified white carbon black is prepared by modifying white carbon black with hexamethyldisilazane, and the molar ratio of the hexamethyldisilazane to the white carbon black is 1:2-1:
3.
4. The low temperature resistant viscous material of claim 1, wherein The polar rubber comprises at least one of acrylate rubber, chloroprene rubber, or nitrile rubber.
5. The low temperature resistant viscous material of claim 1, wherein The crosslinking accelerator is selected from at least one of N.N'-4.4'-diphenylmethane bismaleimide, diallyl terephthalate, triallyl cyanurate, triallyl isocyanurate, SAC-100, UN-7.
6. The low temperature resistant viscous material of claim 1, wherein The silicone rubber is linear polydiorganosiloxane.
7. The low temperature resistant viscous material of claim 1, wherein The damping agent is one of 4-acetylphenylboronic acid, 4-benzyloxyphenylboronic acid, styrene-acrylate copolymer, styrene butadiene copolymer, or polycarbosilane methylsiloxane.
8. The low temperature resistant viscous material of claim 1, wherein The silicone elastomer micro powder has a particle size of 4-20 um.
9. The low temperature resistant viscous material of claim 1, wherein The phenyl silicone oil has a viscosity of 20-50 CST.
10. Use of a low-temperature-resistant viscous material according to any one of claims 1 to 9, characterized in that The low-temperature resistant viscous material is used in a high-altitude damper.