A high-molecular damping liquid, a preparation method and application thereof

Abstract

This invention provides a polymeric damping fluid, its preparation method, and its application, belonging to the field of damping and vibration reduction technology. The polymeric damping fluid disclosed in this invention comprises the following raw materials: liquid butyl rubber, liquid nitrile rubber, and polysiloxane. The liquid butyl rubber, liquid nitrile rubber, and polysiloxane in the polymeric damping fluid of this invention have numerous and large side groups on their molecular chains. When subjected to external force, the sliding between the molecular chains is hindered by these side groups, generating intramolecular frictional damping. This converts the applied force into intramolecular frictional heat, thereby utilizing the inherent polymeric damping material properties of the damping fluid to absorb the transmitted vibrations and achieve self-damping vibration reduction. Therefore, the polymeric damping fluid of this invention has a dual vibration reduction effect, namely, external frictional vibration reduction and self-damping vibration reduction, resulting in excellent damping and vibration reduction performance.

Description

Technical Field

[0001] This invention belongs to the field of damping and vibration reduction technology, specifically relating to a polymer damping fluid, its preparation method, and its application. Background Technology

[0002] To prevent objects from being subjected to sudden impacts, damping shock absorbers have wide applications in daily life, such as in automotive shock absorption systems. Hydraulic shock absorbers are a widely used type, primarily achieving damping by utilizing the friction between the damping fluid filling the shock absorber and its inner wall. Traditional damping fluids are mostly made of small-molecule liquids, whose main function is to convert kinetic energy into heat energy through friction with the pipe wall when subjected to vibration, thereby reducing vibration. However, small-molecule liquids themselves do not have a damping effect. When the vibration frequency increases, the deformation of the parts reaches its limit, the volume of the flow channel cavity shrinks, and the small-molecule liquid cannot flow, thus generating friction, the damping effect decreases significantly.

[0003] Therefore, it is necessary to develop a damping fluid with better damping and shock absorption effect, which can still produce a good damping and shock absorption effect when the deformation of the parts reaches the limit value, the volume of the flow channel cavity shrinks, and the damping fluid cannot flow. Summary of the Invention

[0004] The present invention aims to solve one of the aforementioned problems existing in the prior art. Therefore, one objective of the present invention is to provide a polymeric damping fluid in which the polymer material inherently possesses damping properties, and can still produce a good damping and vibration reduction effect even when the deformation of the part reaches its limit, the volume of the flow channel cavity shrinks, and the damping fluid cannot flow.

[0005] The second objective of this invention is to provide a method for preparing the above-mentioned polymeric damping fluid.

[0006] The third objective of this invention is to provide a hydraulic shock absorber comprising the aforementioned polymer damping fluid.

[0007] The fourth objective of this invention is to provide an automotive shock absorption system.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] The first aspect of the present invention provides a polymeric damping fluid comprising the following raw materials: liquid butyl rubber, liquid nitrile rubber, and polysiloxane.

[0010] The polymeric damping fluid according to the first aspect of the present invention has at least the following beneficial effects:

[0011] When subjected to low-frequency, large-amplitude vibrations (below 20Hz), the polymer damping fluid in the flow channel of the damping block is forced to flow back and forth within the channel under the large-amplitude reciprocating motion. At this time, it generates heat through friction with the channel wall, converting some of the vibrational kinetic energy into heat energy, thus achieving the first level of damping (external friction damping). When the vibration frequency increases (above 20Hz), due to the increased frequency, the flow channel filled with polymer damping fluid is compressed to a certain extent and cannot recover its deformation. The volume of the flow channel cavity shrinks, and the polymer damping fluid within... The liquid will therefore be unable to continue flowing and will not be able to generate frictional heat to dissipate the vibration. At this point, the molecular chains of liquid butyl rubber, liquid nitrile rubber, and polysiloxane in the polymer damping liquid of this invention have many and large side groups. When sliding under external force, the sliding between molecular chains will be hindered by the side groups, generating intramolecular frictional damping. The force can be converted into intramolecular frictional heat, thereby utilizing the polymer damping material properties of the damping liquid itself to absorb the transmitted vibration and achieve a second damping effect (self-damping vibration reduction). Therefore, the polymer damping liquid of this invention has a dual damping effect, namely external frictional vibration reduction and self-damping vibration reduction, and the damping vibration reduction effect is good.

[0012] In some embodiments of the present invention, the average molecular weight of the liquid butyl rubber is ≤40000.

[0013] In some embodiments of the present invention, the average molecular weight of the liquid nitrile rubber is ≤40,000.

[0014] In some embodiments of the present invention, the average molecular weight of the polysiloxane is 500 to 30,000.

[0015] In some embodiments of the present invention, the polysiloxane includes at least one of polydimethylsiloxane, polyvinylsiloxane, or polymethylvinylsiloxane.

[0016] In some embodiments of the present invention, the mass ratio of the liquid butyl rubber to the liquid nitrile rubber is 1:(0.01-5).

[0017] In some embodiments of the present invention, the mass ratio of the liquid butyl rubber to the polysiloxane is 1:(0.1-5).

[0018] In some embodiments of the present invention, the raw materials for preparation also include additives.

[0019] In some embodiments of the present invention, the additives include at least one of plasticizers, molecular weight regulators, surfactants, antioxidants, or organic solvents.

[0020] In some embodiments of the present invention, the plasticizer is selected from ester plasticizers.

[0021] In some embodiments of the present invention, the surfactant includes one or a combination of anionic surfactants, nonionic surfactants.

[0022] In some embodiments of the present invention, the organic solvent includes at least one of hydrocarbon solvents, ester solvents, or alcohol solvents.

[0023] In some embodiments of the present invention, the viscosity of the polymer damping fluid at 40°C is 8000–30000 mPa·s.

[0024] The second aspect of the present invention provides a method for preparing the polymeric damping fluid described in the first aspect of the present invention, comprising the following steps: mixing the raw materials and reacting them to obtain the polymeric damping fluid.

[0025] The method for preparing the polymeric damping fluid according to the second aspect of the present invention has at least the following beneficial effects:

[0026] The preparation method of the polymer damping fluid provided by this invention is simple and easy to operate.

[0027] In some embodiments of the present invention, the temperature of the reaction is ≤30°C.

[0028] In some embodiments of the present invention, the reaction time is ≤20 min.

[0029] A third aspect of the present invention provides a hydraulic shock absorber comprising the polymer damping fluid described in the first aspect of the present invention.

[0030] The hydraulic shock absorber according to the third aspect of the present invention has at least the following beneficial effects:

[0031] The hydraulic shock absorber provided by this invention has a dual damping effect, and still has a good damping effect under high frequency (above 20Hz) conditions, with good damping effect.

[0032] A fourth aspect of the present invention provides an automotive shock absorption system, the automotive shock absorption system comprising one or a combination of the polymer damping fluid described in the first aspect of the present invention and the hydraulic shock absorber described in the third aspect of the present invention.

[0033] The automotive shock absorption system according to the fourth aspect of the present invention has at least the following beneficial effects:

[0034] The automotive shock absorption system provided by this invention includes polymer damping fluid, hydraulic shock absorber or a combination thereof, all of which have dual shock absorption effects. Therefore, the automotive shock absorption system of this invention also has good damping shock absorption effect. Detailed Implementation

[0035] The following examples further illustrate the content of the present invention in detail. It should also be understood that the following examples are only for further explanation of the present invention and should not be construed as limiting the scope of protection of the present invention. Non-essential improvements and adjustments made by those skilled in the art based on the principles described herein are all within the scope of protection of the present invention. The specific process parameters, etc., in the following examples are merely examples within a suitable range; that is, those skilled in the art can make selections within a suitable range based on the description herein, and are not intended to be limited to the specific data in the examples below. Unless otherwise specified, the raw materials, reagents, or apparatus used in the following examples and comparative examples can be obtained from conventional commercial sources or by existing known methods.

[0036] The first aspect of this invention provides a polymeric damping fluid, comprising the following raw materials: liquid butyl rubber, liquid nitrile rubber, and polysiloxane. When subjected to low-frequency, large-amplitude vibration (below 20Hz), the polymeric damping fluid in the flow channel of the damping block is forced to flow back and forth within the channel under the large-amplitude reciprocating motion. At this time, it generates heat through friction with the channel wall, converting a portion of the vibrational kinetic energy into heat energy, thus achieving the first-level damping effect (external friction damping). When the vibration frequency increases (above 20Hz), due to the increased frequency, the flow channel filled with the polymeric damping fluid is compressed to a certain extent and cannot recover its deformation. The volume of the flow channel cavity shrinks, and the polymeric damping fluid within it... The liquid will therefore be unable to continue flowing and will not be able to generate frictional heat to dissipate the vibration. At this point, the molecular chains of liquid butyl rubber, liquid nitrile rubber, and polysiloxane in the polymer damping liquid of this invention have many and large side groups. When sliding under external force, the sliding between molecular chains will be hindered by the side groups, generating intramolecular frictional damping. The force can be converted into intramolecular frictional heat, thereby utilizing the polymer damping material properties of the damping liquid itself to absorb the transmitted vibration and achieve a second damping effect (self-damping vibration reduction). Therefore, the polymer damping liquid of this invention has a dual damping effect, namely external frictional vibration reduction and self-damping vibration reduction, and the damping vibration reduction effect is good.

[0037] Liquid butyl rubber is a synthetic rubber copolymerized from isobutylene and a small amount of isoprene, often abbreviated as butyl rubber. Butyl rubber with lower molecular weights, or processed with solvents and plasticizers, can exist in a liquid state, but its sealing and damping properties remain unchanged.

[0038] Liquid nitrile rubber (LNBR) is a rubber with butadiene and acrylonitrile as its main chain structure, containing or without other functional groups, and which is a viscous liquid at room temperature. Liquid nitrile rubber possesses good damping properties.

[0039] Polysiloxanes are molecules formed by the alternating bonding of silicon atoms and oxygen atoms. Polysiloxanes have excellent mechanical properties, electrical insulation properties and heat resistance. The polysiloxane used in the embodiments of this invention is in liquid form.

[0040] This invention uses these three materials in combination to achieve the effect of converting the external force into intramolecular frictional heat when sliding under external force. This utilizes the polymer damping material properties of the damping fluid itself to absorb the transmitted vibration and improve the damping and vibration reduction effect of the damping fluid.

[0041] In some embodiments of the present invention, liquid butyl rubber, liquid nitrile rubber and polysiloxane are in liquid form.

[0042] In some embodiments of the present invention, the average molecular weight of the liquid butyl rubber is ≤40,000; in some specific embodiments of the present invention, the average molecular weight of the liquid butyl rubber is ≤30,000; in some examples of the present invention, the average molecular weight of the liquid butyl rubber is 10,000 to 30,000. In some specific examples of the present invention, the average molecular weight of the liquid butyl rubber is selected from 10,000, 15,000, 20,000, 25,000, or 30,000.

[0043] In some embodiments of the present invention, the average molecular weight of the liquid nitrile rubber is ≤40,000; in some specific embodiments of the present invention, the average molecular weight of the liquid nitrile rubber is ≤30,000; in some examples of the present invention, the average molecular weight of the liquid nitrile rubber is 10,000 to 30,000. In some specific examples of the present invention, the average molecular weight of the liquid nitrile rubber is selected from 10,000, 15,000, 20,000, 25,000, or 30,000.

[0044] In some embodiments of the present invention, the average molecular weight of the polysiloxane is 500–30,000; in some specific embodiments of the present invention, the average molecular weight of the polysiloxane is 800–25,000; in some examples of the present invention, the average molecular weight of the polysiloxane is 1,000–20,000. In some specific examples of the present invention, the average molecular weight of the polysiloxane is selected from 1,000, 2,000, 5,000, 8,000, 10,000, 15,000, or 20,000.

[0045] In specific embodiments of the present invention, the average molecular weight of the liquid butyl rubber is ≤40,000, the average molecular weight of the liquid nitrile rubber is ≤40,000, and the average molecular weight of the polysiloxane is 500–30,000. This is to ensure good room-temperature fluidity of the damping fluid. When the molecular weight of the butyl rubber or nitrile rubber is greater than 40,000, and the molecular weight of the polysiloxane is greater than 30,000, the room-temperature fluidity of these three raw materials deteriorates, resulting in a correspondingly poor room-temperature fluidity of the damping fluid. If the molecular weight is even higher, it will exist in solid form, which does not meet the usage requirements. It is understood that the liquid butyl rubber, liquid nitrile rubber, or polysiloxane used in the embodiments of the present invention must all be in liquid form.

[0046] In some embodiments of the present invention, the polysiloxane is selected from silicone oil. The silicone oil in these embodiments refers to a linear polysiloxane product that remains liquid at room temperature.

[0047] In some embodiments of the present invention, the polysiloxane includes at least one of polydimethylsiloxane, polyvinylsiloxane, or polymethylvinylsiloxane; in some specific embodiments of the present invention, the polysiloxane is selected from polydimethylsiloxane.

[0048] Polydimethylsiloxane, also known as dimethyl silicone oil, varies in appearance from a colorless, transparent, volatile liquid to an extremely viscous liquid or silica gel, depending on its relative molecular mass. Dimethyl silicone oil is non-toxic and odorless, possesses physiological inertness, chemical stability, electrical insulation, and high shear resistance, and can be used for extended periods at temperatures ranging from -50℃ to 200℃. In this invention, polydimethylsiloxane is used as one of the raw materials for a polymeric damping fluid, resulting in a polymeric damping fluid with excellent damping and shock absorption effects.

[0049] In some embodiments of the present invention, the mass ratio of liquid butyl rubber to liquid nitrile rubber is 1:(0.01-5); in some specific embodiments of the present invention, the mass ratio of liquid butyl rubber to liquid nitrile rubber is 1:(0.05-3); in some examples of the present invention, the mass ratio of liquid butyl rubber to liquid nitrile rubber is 1:(0.08-2). In some specific examples of the present invention, the mass ratio of liquid butyl rubber to liquid nitrile rubber is 1:0.08, 1:0.1, 1:0.2, 1:0.5, 1:1, 1:1.5, or 1:2.

[0050] In this embodiment of the invention, if the mass ratio of liquid butyl rubber to liquid nitrile rubber is not within the range of 1:(0.01~5), the viscosity of the resulting damping fluid will be too high or too low. For example, if too much liquid nitrile rubber is used, such as a mass ratio of liquid butyl rubber to liquid nitrile rubber of 1:6, the viscosity of the damping fluid will increase, exceeding 30000 mPa·s. Excessive viscosity will greatly affect the normal operation of the damping fluid, resulting in poor damping and shock absorption effects. If too little liquid nitrile rubber is used, the viscosity of the resulting damping fluid will be too low, and its damping and shock absorption effects will also be poor.

[0051] In some embodiments of the present invention, the mass ratio of liquid butyl rubber to polysiloxane is 1:(0.1-5); in some specific embodiments of the present invention, the mass ratio of liquid butyl rubber to polysiloxane is 1:(0.05-3); in some examples of the present invention, the mass ratio of liquid butyl rubber to polysiloxane is 1:(0.08-2). In some specific examples of the present invention, the mass ratio of liquid butyl rubber to polysiloxane is 1:0.08, 1:0.1, 1:0.2, 1:0.5, 1:1, 1:1.5, or 1:2.

[0052] In this embodiment of the invention, if the mass ratio of liquid butyl rubber to polysiloxane is not within the range of 1:(0.1~5), the damping performance of the resulting damping fluid will be poor. For example, if too much polysiloxane is used, such as a mass ratio of liquid butyl rubber to liquid polysiloxane of 1:6, the damping coefficient (solid) of the damping fluid at 20℃ / 10Hz will decrease significantly, becoming much less than 0.2, resulting in a decrease in damping performance. If too little polysiloxane is used, the damping coefficient of the resulting damping fluid will also be too low, resulting in poor damping performance.

[0053] In some embodiments of the present invention, the raw materials also include additives. It is understood that the present invention achieves the damping and shock absorption effect using three main materials: liquid butyl rubber, liquid nitrile rubber, and polysiloxane, while the additives are auxiliary materials used to improve the overall performance of the damping fluid. Therefore, in specific implementations, the raw materials may or may not include additives.

[0054] In some embodiments of the present invention, the mass ratio of liquid butyl rubber to additives is 1:(1-10); in some specific embodiments of the present invention, the mass ratio of liquid butyl rubber to additives is 1:(2-8); in some examples of the present invention, the mass ratio of liquid butyl rubber to additives is 1:(3-6). In some specific examples of the present invention, the mass ratio of liquid butyl rubber to additives is 1:3, 1:3.5, 1:4, 1:4.5, 1:5, 1:5.5, or 1:6.

[0055] In some embodiments of the present invention, the additives include at least one of plasticizers, molecular weight regulators, surfactants, antioxidants, or organic solvents; in some specific embodiments of the present invention, the additives include plasticizers, molecular weight regulators, surfactants, antioxidants, and organic solvents.

[0056] In some embodiments of the present invention, the plasticizer is selected from ester plasticizers; in some specific embodiments of the present invention, the plasticizer includes at least one of phthalate esters, fatty acid esters, phosphate esters, or polyol ester plasticizers; in some examples of the present invention, the plasticizer includes at least one of dibutyl phthalate, dioctyl phthalate, di(2-ethylhexyl) phthalate, butyl oleate, butyl stearate, tri(2-ethylhexyl) phosphate, diphenyl octyl phosphate, dimethyl methacrylate, tricresyl phosphate, or diethylene glycol-C5-9 ester. In some specific examples of the present invention, the plasticizer is selected from dibutyl phthalate, dioctyl phthalate, or di(2-ethylhexyl) phthalate.

[0057] Dibutyl phthalate, dioctyl phthalate, and di(2-ethylhexyl) phthalate are all phthalate plasticizers. In some embodiments of the present invention, dioctyl phthalate is used to adjust the viscosity of the polymer damping liquid, which has a good plasticizing effect.

[0058] In some embodiments of the present invention, the plasticizer accounts for 18-50% by mass in the polymeric damping fluid; in some specific embodiments of the present invention, the plasticizer accounts for 20-48% by mass in the polymeric damping fluid; in some examples of the present invention, the plasticizer accounts for 22-45% by mass in the polymeric damping fluid. In some specific examples of the present invention, the plasticizer accounts for 22%, 23%, 25%, 28%, 30%, 35%, 40%, or 45% by mass in the polymeric damping fluid.

[0059] In some specific embodiments of the present invention, the molecular weight regulator includes at least one of aliphatic thiols, halides, or α-methylstyrene dimers; in some specific embodiments of the present invention, the molecular weight regulator is selected from α-methylstyrene dimers.

[0060] α-Methylstyrene dimer (AMSD) is an odorless, sulfur-free molecular weight regulator that can reduce the branching degree of polymer chains, decrease the molecular weight, and achieve a uniform and narrow molecular weight distribution. It is safe and environmentally friendly, serving as a green molecular weight regulator, chain transfer agent, chain terminator, and polymer modifier. In this invention, it is used as an optional raw material for controlling molecular weight, and can control the molecular weight and viscosity of the mixed damping fluid.

[0061] In some embodiments of the present invention, the mass percentage of the molecular weight regulator in the polymer damping liquid is 0.5% to 4%; in some specific embodiments of the present invention, the mass percentage of the molecular weight regulator in the polymer damping liquid is 0.8% to 3.5%; in some examples of the present invention, the mass percentage of the molecular weight regulator in the polymer damping liquid is 1% to 3%. In some specific examples of the present invention, the mass percentage of the molecular weight regulator in the polymer damping liquid is 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, 2.2%, 2.5%, 2.8%, or 3%.

[0062] In some embodiments of the present invention, the surfactant includes one or a combination of anionic surfactants, nonionic surfactants.

[0063] In some embodiments of the present invention, the anionic surfactant includes at least one of carboxylates, sulfonates, sulfates, or phosphates; in some specific embodiments of the present invention, the anionic surfactant is selected from sulfates; in some examples of the present invention, the sulfate includes at least one of alkyl sulfates, fatty alcohol polyoxyethylene ether sulfates, or glycerol fatty acid ester sulfates.

[0064] In some embodiments of the present invention, the nonionic surfactant includes at least one of polyoxyethylene type, polyol type, alkanolamide type, polyether type or amine oxide type surfactant.

[0065] In some specific embodiments of the present invention, the surfactant is selected from anionic surfactants; in some examples of the present invention, the surfactant includes at least one selected from sodium dodecyl sulfate, sodium tetradecyl sulfate, sodium hexadecyl sulfate, sodium lauryl ether sulfate, or sodium glyceromonoester disulfate. In some specific examples of the present invention, the surfactant is selected from sodium dodecyl sulfate, sodium tetradecyl sulfate, or sodium hexadecyl sulfate.

[0066] Sodium dodecyl sulfate, sodium tetradecyl sulfate, and sodium hexadecyl sulfate are all anionic surfactants. Sodium dodecyl sulfate has good emulsifying, foaming, water solubility, biodegradability, alkali resistance, and hard water resistance properties. When applied in some embodiments of the present invention, it has a good emulsifying effect and plays a role in optimizing processability and flowability.

[0067] In some embodiments of the present invention, the surfactant accounts for 0.5% to 10% of the polymeric damping fluid by mass; in some specific embodiments of the present invention, the surfactant accounts for 0.8% to 8% of the polymeric damping fluid by mass; in some examples of the present invention, the surfactant accounts for 1% to 7.5% of the polymeric damping fluid by mass. In some specific examples of the present invention, the surfactant accounts for 1%, 1.2%, 1.5%, 1.8%, 2%, 2.5%, 3%, 3.5%, 4%, 5%, 6%, 7%, or 7.5% of the polymeric damping fluid by mass.

[0068] In some embodiments of the present invention, the antioxidant includes at least one of hindered phenolic, phosphite, or thioester antioxidants; in some specific embodiments of the present invention, the antioxidant is selected from hindered phenolic antioxidants; in some examples of the present invention, the antioxidant includes at least one of antioxidant TH-CPL, antioxidant 1010, antioxidant 1076, or antioxidant 1135. In some specific examples of the present invention, the antioxidant is selected from antioxidant TH-CPL.

[0069] The antioxidant TH-CPL, or poly(dicyclopentadiene-co-p-cresol), is a hindered phenolic antioxidant with good thermal stability. In some embodiments of this invention, it is used as a protective antioxidant for the damping fluid, which can extend the service life of the damping fluid.

[0070] In some embodiments of the present invention, the antioxidant accounts for 0.05% to 2% of the polymeric damping liquid by mass; in some specific embodiments of the present invention, the antioxidant accounts for 0.08% to 1.5% of the polymeric damping liquid by mass; in some examples of the present invention, the antioxidant accounts for 0.1% to 1% of the polymeric damping liquid by mass. In some specific examples of the present invention, the antioxidant accounts for 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1% of the polymeric damping liquid by mass.

[0071] In some embodiments of the present invention, the organic solvent includes at least one of hydrocarbon solvents, ester solvents, or alcohol solvents.

[0072] In some embodiments of the present invention, the hydrocarbon solvent includes at least one selected from ethane, propane, butane, ethylene, propylene, butene, toluene, xylene, ethylbenzene, or diethylbenzene.

[0073] In some embodiments of the present invention, the ester solvent includes at least one of methyl formate, ethyl formate, propyl formate, methyl benzoate, ethyl benzoate, propyl benzoate, isoamyl benzoate, or ethyl phenylacetate.

[0074] In some embodiments of the present invention, the alcohol solvent includes at least one of methanol, ethanol, propanol, isopropanol, ethylene glycol, glycerol, benzyl alcohol, or phenylethanol.

[0075] In some specific embodiments of the present invention, the organic solvent is selected from hydrocarbon solvents; in some examples of the present invention, the organic solvent includes at least one selected from ethane, propane, butane, ethylene, propylene, butene, toluene, xylene, ethylbenzene, or diethylbenzene. In some specific examples, the organic solvent is selected from toluene, xylene, ethylbenzene, or diethylbenzene.

[0076] Xylene can be used as a solvent for coatings, adhesives and varnishes. As a good solvent in some embodiments of the present invention, it can adjust the viscosity and canning processability of polymer damping fluid.

[0077] In some embodiments of the present invention, the organic solvent accounts for 15-45% by mass in the polymeric damping liquid; in some specific embodiments of the present invention, the organic solvent accounts for 20-40% by mass in the polymeric damping liquid; in some examples of the present invention, the organic solvent accounts for 24-35% by mass in the polymeric damping liquid. In some specific examples of the present invention, the organic solvent accounts for 24%, 25%, 27%, 29%, 30%, 32%, or 35% by mass in the polymeric damping liquid.

[0078] In some embodiments of the present invention, the polymeric damping fluid comprises the following raw materials in weight percentages: 5-20% liquid butyl rubber, 0.5-20% liquid nitrile rubber, 5-20% polysiloxane, 18-50% plasticizer, 0.5-4% molecular weight regulator, 0.5-10% surfactant, 0.05-2% antioxidant, and 15-45% organic solvent.

[0079] In some specific embodiments of the present invention, the polymeric damping fluid comprises the following raw materials in weight percentage: 6-18% liquid butyl rubber, 0.8-18% liquid nitrile rubber, 6-18% polysiloxane, 20-48% plasticizer, 0.8-3.5% molecular weight regulator, 0.8-8% surfactant, 0.08-1.5% antioxidant, and 20-40% organic solvent.

[0080] In some specific examples of the present invention, the polymeric damping fluid comprises the following raw materials in weight percentage: 7-15% liquid butyl rubber, 1-15% liquid nitrile rubber, 7-15% polysiloxane, 22-45% plasticizer, 1-3% molecular weight regulator, 1-7.5% surfactant, 0.1-1% antioxidant, and 24-35% organic solvent.

[0081] In some embodiments of the present invention, the viscosity of the polymeric damping fluid at 40°C is 8000–30000 mPa·s; in some specific embodiments of the present invention, the viscosity of the polymeric damping fluid at 40°C is 10000–28000 mPa·s; in some examples of the present invention, the viscosity of the polymeric damping fluid at 40°C is 12000–26000 mPa·s. In some specific examples of the present invention, the viscosity of the polymeric damping fluid at 40°C is 12000 mPa·s, 14000 mPa·s, 16000 mPa·s, 18000 mPa·s, 20000 mPa·s, 22000 mPa·s, 24000 mPa·s, or 26000 mPa·s.

[0082] In some embodiments of the present invention, the failure temperature of the polymer damping fluid is 80–120°C; in some specific embodiments of the present invention, the failure temperature of the polymer damping fluid is 82–110°C; in some examples of the present invention, the failure temperature of the polymer damping fluid is 85–100°C. In some specific examples of the present invention, the failure temperatures of the polymer damping fluid are 85°C, 88°C, 90°C, 92°C, 95°C, 98°C, and 100°C.

[0083] In some embodiments of the present invention, the solid damping coefficient of the polymer damping liquid at 20°C and 10Hz is >0.1; in some specific embodiments of the present invention, the solid damping coefficient of the polymer damping liquid at 20°C and 10Hz is >0.15; in some examples of the present invention, the solid damping coefficient of the polymer damping liquid at 20°C and 10Hz is >0.2.

[0084] In some embodiments of the present invention, the density of the polymeric damping fluid is 0.7–1.05 g / cm³. 3 In some specific embodiments of the present invention, the density of the polymer damping fluid is 0.8–1.02 g / cm³. 3 In some examples of this invention, the density of the polymeric damping fluid is 0.85–1 g / cm³. 3 In some specific examples of this invention, the density of the polymeric damping fluid is 0.85 g / cm³. 3 0.87g / cm 3 0.89 g / cm 3 0.9g / cm 3 0.91g / cm 3 0.95g / cm 3 0.97g / cm 3 or 1g / cm 3 .

[0085] In some embodiments of the present invention, the Tg of the polymer damping fluid is -75 to -45°C; in some specific embodiments of the present invention, the Tg of the polymer damping fluid is -70 to -50°C; in some examples of the present invention, the Tg of the polymer damping fluid is -68 to -55°C. In some specific examples of the present invention, the Tg of the polymer damping fluid is -68°C, -65°C, -63°C, -61°C, -60°C, -58°C, or -55°C.

[0086] A second aspect of this invention provides a method for preparing the polymeric damping fluid of the first aspect of this invention, comprising the following steps: mixing and reacting various raw materials to obtain the polymeric damping fluid. This method for preparing the polymeric damping fluid is simple and convenient to operate.

[0087] In some embodiments of the present invention, the reaction temperature is ≤30°C; in some specific embodiments of the present invention, the reaction temperature is 10–30°C.

[0088] In some embodiments of the present invention, the reaction time is ≤20 min; in some specific embodiments of the present invention, the reaction time is 5 to 20 min.

[0089] In some embodiments of the present invention, the preparation method of the polymer damping fluid includes the following steps: mixing liquid butyl rubber, liquid nitrile series and polysiloxane for a first reaction, then adding plasticizer and mixing for a second reaction, then adding molecular weight regulator, surfactant and antioxidant and mixing for a third reaction, then adding organic solvent and mixing for a fourth reaction, and mixing under vacuum conditions for a fifth reaction to obtain the polymer damping fluid.

[0090] In some embodiments of the present invention, the temperature of the first reaction is 10 to 30°C; in some specific embodiments of the present invention, the temperature of the first reaction is 10°C, 15°C, 20°C, 23°C, 25°C, or 30°C.

[0091] In some embodiments of the present invention, the time of the first reaction is 10 to 60 seconds; in some specific embodiments of the present invention, the time of the first reaction is 10 seconds, 20 seconds, 30 seconds, 40 seconds, 50 seconds, or 60 seconds.

[0092] In some embodiments of the present invention, the temperature of the second reaction is 10 to 30°C; in some specific embodiments of the present invention, the temperature of the second reaction is 10°C, 15°C, 20°C, 23°C, 25°C, or 30°C.

[0093] In some embodiments of the present invention, the time of the second reaction is 80 to 180 s; in some specific embodiments of the present invention, the time of the second reaction is 80 s, 90 s, 100 s, 110 s, 120 s, 130 s, 140 s, 150 s, 160 s, 170 s or 180 s.

[0094] In some embodiments of the present invention, the temperature of the third reaction is ≤23°C; in some specific embodiments of the present invention, the temperature of the third reaction is 10°C, 12°C, 15°C, 18°C, 20°C or 23°C.

[0095] In some embodiments of the present invention, the time of the third reaction is 80 to 180 s; in some specific embodiments of the present invention, the time of the third reaction is 80 s, 90 s, 100 s, 110 s, 120 s, 130 s, 140 s, 150 s, 160 s, 170 s or 180 s.

[0096] In some embodiments of the present invention, the temperature of the fourth reaction is ≤23°C; in some specific embodiments of the present invention, the temperature of the fourth reaction is 10°C, 12°C, 15°C, 18°C, 20°C or 23°C.

[0097] In some embodiments of the present invention, the time of the fourth reaction is 400-600 s; in some specific embodiments of the present invention, the time of the fourth reaction is 400 s, 420 s, 450 s, 480 s, 500 s, 520 s, 550 s, 580 s or 600 s.

[0098] In some embodiments of the present invention, the temperature of the fifth reaction is ≤23°C; in some specific embodiments of the present invention, the temperature of the fifth reaction is 10°C, 12°C, 15°C, 18°C, 20°C or 23°C.

[0099] In some embodiments of the present invention, the time for the fifth reaction is 3 to 8 minutes; in some specific embodiments of the present invention, the time for the fifth reaction is 3 minutes, 4 minutes, 5 minutes, 6 minutes, 7 minutes, or 8 minutes.

[0100] In the above method for preparing the damping fluid, the temperature during any mixing process should preferably not exceed 30°C, and the total mixing time should preferably be less than 20 minutes. If the reaction temperature is too high or the reaction time is too long, the raw materials will cross-link and solidify, making it impossible to obtain the damping fluid.

[0101] A third aspect of this invention provides a hydraulic shock absorber comprising the polymer damping fluid of the first aspect of this invention. The hydraulic shock absorber provided by this invention has a dual damping effect, maintaining good damping performance even under high-frequency (above 20Hz) conditions, resulting in excellent shock absorption.

[0102] A fourth aspect of this invention provides an automotive shock absorption system, comprising one or a combination of a polymeric damping fluid from the first aspect of this invention and a hydraulic shock absorber from the third aspect of this invention. The automotive shock absorption system provided by this invention includes a polymeric damping fluid, a hydraulic shock absorber, or a combination thereof, all of which have dual damping effects; therefore, the automotive shock absorption system of this invention also has good damping and shock absorption effects.

[0103] The present invention will be further described below with reference to specific embodiments.

[0104] In a specific embodiment of the present invention, the liquid butyl rubber used was purchased from Shenzhen Masni ROCEOILLIIR-30K.

[0105] In a specific embodiment of the present invention, the liquid nitrile rubber used was purchased from Shanghai Zhuzi ROCEOILLNBR40.

[0106] In a specific embodiment of the present invention, the dimethyl polysiloxane used was purchased from Dow Corning PMX-500CS.

[0107] In a specific embodiment of the present invention, the dioctyl phthalate used was purchased from Qilu Petrochemical.

[0108] In a specific embodiment of the present invention, the molecular weight regulator AMSD used was purchased from Wuxi Yiyuan New Materials.

[0109] In a specific embodiment of the present invention, the sodium dodecyl sulfate (K12, liquid) used was purchased from Jinan Ausley.

[0110] In a specific embodiment of the present invention, the antioxidant TH-CPL used was purchased from Huaxiang Kejie.

[0111] In a specific embodiment of the present invention, the xylene used was purchased from Wuxi Jingke.

[0112] Examples 1-4

[0113] A polymeric damping fluid is prepared using the raw materials shown in Table 1. The specific preparation method includes the following steps:

[0114] S1. Add liquid butyl rubber, liquid nitrile series, and liquid polydimethylsiloxane to a stirrer and stir for 30 seconds at a temperature of 23°C. Then add dioctyl phthalate to the stirrer and stir for 120 seconds at a temperature of 23°C. Then remove the resulting liquid and cool it for later use.

[0115] S2. The mixture obtained in step S1 is put into a vacuum mixer, and then the molecular weight regulator AMSD, sodium dodecyl sulfate, and antioxidant TH-CPL are added. The mixture is mixed at 23°C for 120 seconds, then xylene is added and the mixture is mixed at 23°C for 480 seconds. After the mixture is completed, a vacuum is drawn for 5 minutes. After the vacuum is drawn, the resulting mixture is taken out to obtain the polymer damping liquid.

[0116] In the above-mentioned method for preparing polymer damping fluid, the temperature during any process of stirring shall not exceed 30°C, and the total stirring and mixing time shall be less than 20 min.

[0117] Table 1. Raw materials used in the preparation of Examples 1-4 (unit: wt%)

[0118] Example 1 Example 2 Example 3 Example 4 Liquid butyl rubber 14.6 12.4 13.9 14.9 Liquid nitrile rubber 1.5 3.7 13.9 14.9 Dimethylpolysiloxane 14.6 12.4 13.9 14.9 Dioctyl phthalate (DOP) 29.2 37.3 27.7 22.4 Molecular weight regulator AMSD 2.9 2.5 1.4 1.5 Sodium dodecyl sulfate (K12) 7.3 6.2 1.4 1.5 Antioxidant TH-CPL 0.7 0.6 0.1 0.1 xylene 29.2 24.8 27.7 29.8

[0119] Comparative Example 1

[0120] This example provides a small molecule ethylene glycol damping fluid, which is composed of ethylene glycol and water in a mass ratio of 1:1.

[0121] Performance testing

[0122] The viscosity (spiral viscometer, GB / T 265), failure temperature (thermometer, failure mode: visual curing), damping coefficient (Hitachi DMA7100, reference GB / T 18258), density (densitometer, reference GB / T 533), and Tg (Hitachi DSC200, reference GB / T 19466 and GB / T 29611) of the damping fluids in Examples 1-4 and Comparative Example 1 were tested according to their respective national standards (if applicable) and industry-standard methods (if no standards exist). Furthermore, the viscosity test temperature for Examples 1-4 was 40°C, and the test temperature for Comparative Example 1 was 16°C.

[0123] The test results are shown in Table 2.

[0124] Table 2 shows the performance test results of the damping fluids in Examples 1-4 and Comparative Example 1.

[0125]

[0126]

[0127] The small-molecule damping fluid in Comparative Example 1, under conditions of increased vibration frequency, component deformation reaching its limit, and reduced flow channel cavity volume, exhibits a significant decrease in damping and vibration reduction effect due to its inability to flow, resulting in frictional damping. It lacks self-damping and vibration reduction capabilities, thus exhibiting poor vibration reduction at vibration frequencies above 20Hz. In contrast, the three polymeric materials in the damping fluids of Examples 1-4—liquid butyl rubber, liquid nitrile rubber, and dimethyl polysiloxane—possess excellent self-damping and vibration reduction effects. Even when unable to flow and thus unable to generate frictional damping, their molecular chains have numerous and large side groups. When the molecular chains slide under external force, the sliding between the molecular chains is hindered by these side groups, generating intramolecular frictional damping. This converts the applied force into intramolecular frictional heat, thereby absorbing the transmitted vibration and providing a second layer of damping and vibration reduction effect—the self-damping effect. In other words, the polymeric damping fluids of Examples 1-4 still exhibit good vibration reduction effects even under conditions of vibration frequencies above 20Hz, component deformation reaching its limit, and reduced flow channel cavity volume.

[0128] In some embodiments of the present invention, the polymer damping fluid of the present invention is applied to a hydraulic shock absorber to obtain a hydraulic shock absorber with dual damping effect. It still has a good damping effect when the vibration frequency increases, the deformation of the parts reaches the limit value, and the volume of the flow channel cavity shrinks.

[0129] In some embodiments of the present invention, the polymer damping fluid or hydraulic shock absorber of the present invention is applied to the automotive shock absorption system to obtain an automotive shock absorption system with dual shock absorption effect, which still has a good shock absorption effect when the vibration frequency increases, the deformation of the parts reaches the limit value, and the volume of the flow channel cavity shrinks.

[0130] In the description of this specification, references to terms such as "some embodiments," "examples," or "specific embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A polymeric damping fluid, characterized in that, The preparation materials include: liquid butyl rubber, liquid nitrile rubber, and polysiloxane; the average molecular weight of the liquid butyl rubber is ≤40,000; the average molecular weight of the liquid nitrile rubber is ≤40,000; the average molecular weight of the polysiloxane is 500~30,000; the polysiloxane includes at least one of polydimethylsiloxane, polyvinylsiloxane, or polymethylvinylsiloxane; the mass ratio of the liquid butyl rubber to the liquid nitrile rubber is 1:(0.01~5); the mass ratio of the liquid butyl rubber to the polysiloxane is 1:(0.1~5).

2. The polymer damping fluid according to claim 1, characterized in that, The raw materials used in the preparation also include auxiliary agents.

3. The polymer damping fluid according to claim 2, characterized in that, The additives include at least one of plasticizers, molecular weight regulators, surfactants, antioxidants, or organic solvents.

4. The polymer damping fluid according to claim 3, characterized in that, The plasticizer is selected from ester plasticizers; And / or, the surfactant includes one or a combination of anionic surfactants, nonionic surfactants; And / or, the organic solvent includes at least one of hydrocarbon solvents, ester solvents, or alcohol solvents.

5. The polymeric damping fluid according to any one of claims 1 to 4, characterized in that, The viscosity of the polymer damping fluid at 40°C is 8000~30000 mPa·s.

6. The method for preparing the polymeric damping fluid according to any one of claims 1 to 5, characterized in that, Includes the following steps: The raw materials are mixed and reacted to obtain the polymer damping fluid.

7. The preparation method according to claim 6, characterized in that, The temperature of the reaction is ≤30℃; And / or, the reaction time is ≤20 min.

8. A hydraulic shock absorber, characterized in that, Includes the polymeric damping fluid as described in any one of claims 1 to 5.

9. A vehicle shock absorption system, characterized in that, It includes one or a combination of the polymer damping fluid as described in any one of claims 1 to 5 and the hydraulic shock absorber as described in claim 8.

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