Automobile suspension noise reduction damping liquid containing gel and preparation method thereof
阅读说明：本技术 一种汽车悬置含凝胶的降噪阻尼液及其制备方法 (Automobile suspension noise reduction damping liquid containing gel and preparation method thereof ) 是由 易政 吴耀明 程勇 王立民 孙成俭 高文智 尹东明 梁飞 张嘉佳 王立东 于 2020-07-28 设计创作，主要内容包括：本发明公开了属于振动与噪声控制技术领域的一种汽车悬置含凝胶的降噪阻尼液及其制备方法；该阻尼液由A和B双组分构成,A组分为丙烯酸-淀粉-膨润土三元共聚的高吸水树脂(SAP)水凝胶,B组分是乙二醇；配方为：A组分占阻尼液比例为48wt.％至50wt.％,B组分占阻尼液比例为50wt.％至52wt.％。将凝聚态凝胶引入该汽车悬置的阻尼液中,使得汽车发动机液压悬置降噪约2dB(A),振动与噪声控制效果好。为凝聚态凝胶引入其它行业,诸如舰船、潜艇、航空、航天、轨道交通、矿山机械以及电池振动台等的液压阻尼减振器的阻尼液中,开创了全新方向。(The invention discloses a noise reduction damping liquid containing gel for an automobile suspension and a preparation method thereof, belonging to the technical field of vibration and noise control; the damping fluid consists of a component A and a component B, wherein the component A is acrylic acid-starch-bentonite ternary copolymerized super absorbent resin (SAP) hydrogel, and the component B is ethylene glycol; the formula is as follows: the component A accounts for 48 wt.% to 50 wt.% of the damping fluid, and the component B accounts for 50 wt.% to 52 wt.% of the damping fluid. The condensed gel is introduced into the damping fluid of the automobile suspension, so that the noise of the hydraulic suspension of the automobile engine is reduced by about 2dB (A), and the vibration and noise control effect is good. The gel is introduced into damping liquid of hydraulic damping vibration absorbers of other industries such as ships, submarines, aviation, aerospace, rail transit, mining machinery, battery vibration tables and the like, and a brand new direction is created.)
1. The noise-reducing damping fluid containing gel for the automobile suspension is characterized by being constructed by two components A and B, wherein the two components are composed of: the component A accounts for 48 wt.% to 50 wt.% of the damping fluid, and the component B accounts for 50 wt.% to 52 wt.% of the damping fluid;
the component A is acrylic acid-starch-bentonite ternary copolymerized super absorbent resin hydrogel which is formed by absorbing deionized water 11-15 times of the weight of acrylic acid-starch-bentonite ternary copolymerized super absorbent resin powder; wherein the super absorbent resin powder:
the end value range of the powder particle size distribution is 0.15mm to 0.25mm, or the end of the minimum value of the powder particle size is 0.15mm, and the end of the maximum value of the powder particle size is 0.25 mm; the residual monomer content in the powder is in the range of 110ppm to 200ppm, or the acrylic residual monomer content in the powder is in the range of 110ppm to 200 ppm;
the component B is chemically pure ethylene glycol.
2. The preparation method of the noise-reducing damping fluid containing gel for the suspension of the automobile according to claim 1, is characterized by comprising the following steps:
the first step is as follows: selecting materials:
taking 1 g of super absorbent resin powder which passes through a 60-mesh Taylor standard sieve for acrylic acid-starch-bentonite ternary polymerization; adding the 1 g of resin powder into a beaker containing 1000 ml of deionized water, starting a magnetic stirrer, enabling the stirring speed of a rotor on the stirrer to reach 60 r/min, stirring for 10 hours, sealing the opening of the beaker by using a 200-mesh metal nickel screen, filtering to obtain clear liquid, standing the clear liquid for 24 hours, taking 10 ml of the clear liquid on the clear liquid, analyzing the content of the residual monomers on a liquid chromatograph, or analyzing the content of acrylic acid which does not generate polymerization reaction, wherein the content of the residual monomers is in the range of 110ppm to 200ppm, or the content of the residual monomers is in the range of 110 microgram/g to 200 microgram/g, selecting the resin powder, and selecting the resin powder beyond the range;
the second step is that: screening:
placing a 60-mesh Taylor standard sieve and a 100-mesh Taylor standard sieve in a laminated manner, placing the 60-mesh Taylor standard sieve above the 100-mesh sieve, pouring acrylic acid-starch-bentonite ternary polymerization super absorbent resin powder into an upper-layer sieve of the laminated sieve constructed by the 60-mesh Taylor standard sieve and the 100-mesh Taylor standard sieve, and shaking the laminated sieve for sieving to obtain three kinds of powder, namely coarse powder, coarse powder and fine powder, wherein the coarse powder is the super absorbent resin powder which cannot pass through the 60-mesh Taylor standard sieve and is retained in the 60-mesh Taylor standard sieve; the coarse powder is as follows: the super absorbent resin powder which can pass through a 60-mesh Taylor standard sieve but cannot pass through a 100-mesh Taylor standard sieve and is retained in the 100-mesh Taylor standard sieve is acrylic acid-starch-bentonite ternary polymerization super absorbent resin powder with the particle size distribution end value range of 0.15mm to 0.25mm to be obtained by sieving, the super absorbent resin powder is packaged in a self-sealing bag and is retained for standby, and the fine powder is powder which passes through the 100-mesh Taylor standard sieve, and the fine powder and the most coarse powder are retained for other uses;
the third step: constructing a component A:
at room temperature, according to the weight ratio of 1 part of super absorbent resin powder to 11 parts to 15 parts of deionized water, or the following steps: 1 kg of the resin powder is mixed with 11 kg to 15 kg of deionized water; firstly, pouring weighed deionized water into a bucket, scattering super absorbent resin powder on the water surface in batches according to the proportion, manually stirring until the water surface powder is uniformly distributed into the water, then scattering a second batch of super absorbent resin powder on the liquid surface in the bucket, stirring, and repeating until all the super absorbent resin powder is scattered into the bucket; after checking that the resin powder scattered into the barrel is free of agglomeration, standing for 24 hours to ensure that the resin powder absorbs water to ensure that the resin particles absorb water uniformly inside and outside, thereby obtaining super absorbent resin hydrogel which is the component A, and completing the step of constructing the component A;
the fourth step: preparing damping liquid:
at room temperature, firstly, pouring weighed ethylene glycol into a batching barrel, wherein the purity of the ethylene glycol is chemical purity, then pouring the weighed component A into the batching barrel, inserting a stirring paddle rotating at 60 revolutions per minute into the batching barrel, and stirring the mixture in the batching barrel for 15 minutes; the mixing proportion of the two is as follows: the component A accounts for 48 to 50 wt.% of the mixture, and the balance is ethylene glycol; or ethylene glycol in a proportion of 50 wt.% to 52 wt.% of the mixture; the mixture is a prepared target product, namely the noise reduction damping liquid containing the gel.
Technical Field
The invention relates to a damping fluid containing gel and having a noise reduction function for an automobile hydraulic suspension. In particular to a formula of a novel damping fluid for improving the noise reduction function of a front suspension of a household car engine and a preparation method thereof.
Background
For the conception and development history of the suspension in the invention entitled "automobile suspension containing gel noise reduction damping fluid and preparation method thereof", it is obvious that Chinese words such as "suspension" (suspension) and "engine suspension" (suspension system or engine mounting system) are rather strange for non-automobile professionals. "suspension" appears to be an abbreviation for "placement or device in a suspended manner" as the name suggests in Chinese. However, "suspension" is a term in the automotive profession that has been converted to a proprietary automotive component.
Automobile repairmen colloquially refer to the automobile engine suspension as a 'machine claw mat' (engine claw rubber mat or engine claw suspension); this common name, whether Chinese or English, is helpful to the understanding of the term "hang" by "exterior Chinese".
The three characters of 'machine', 'claw' and 'pad' in the 'claw pad' are separated, the 'machine' obviously refers to an engine, and the 'claw' schematically indicates: the 'claw' of the animal is used for grabbing an automobile engine like the 'claw' of the animal; "pad" is obviously referred to as "shim", a shim to isolate vibration. The English engine rubber scrubber gaskets decomposition is also similar, redundancy is given to non-English professionals in the second foreign language: the engine word means the engine, the claw word means the (animal) "paw", the gasket word means the "pad" or "washer" or "shim"; none of these "mats" are, in the present day, more specifically defined as "rubber mats" (rubber mats).
In view of the development history of automobiles, "suspension" is not difficult to understand, automobiles were originally developed or produced, in order to prevent the vibration of automobile engines from being transmitted to automobile bodies, a wood block is used for vibration isolation and engine fixing between engines and engine frames, the wood block is used for initial "stopping" (stopping vibration) "suspension", due to the good rubber vibration isolation effect, a rubber rod is inserted into the middle of the wood block in a drilling mode or a rubber pad is added for better stopping and vibration isolation, and the wood block is used for "upgraded suspension" on the basis of the wood block. Wood is flammable, wood is replaced with damping alloys, and is designed to facilitate vibration damping and isolation of complex systems or devices. It can be seen that the "suspension" in the automotive industry today is subject to the evolution of material component devices, and conforms to the evolution process of "all things being, from the beginning to the beginning, from the large to the simple, and from the evolution to the complex".
Essentially, the suspension is not a vehicle shock absorber, and is a special shock absorber for a vehicle vibration source, namely an engine; the automobile industry is not called engine shock absorber, and a proper term "suspension" is created after the shock absorber is taken out, which shows that the suspension is like an engine or a tire and plays an indispensable important role for hundreds of components or devices in an automobile. For example, it is understood that while a vehicle tire is a vibration absorber of a vehicle when standing in a vibration and noise control perspective, the position of the vibration absorber is indispensable relative to other vibration absorbing members in the vehicle, or a vehicle without a tire is difficult to be called a "vehicle", which is likely to be a rail vehicle or a train, and it is necessary to give the proper term "tire" from among a plurality of vibration absorbers alone.
The invention relates to a concept of damping liquid in an automobile suspension gel-containing noise reduction damping liquid and a preparation method thereof and application thereof. Since the damping fluid is mostly used in the shock absorber or the shock absorber, those in the field of vibration control are often called as "damping fluid", and obviously, the "damping fluid" is a concept of "damping fluid" more "upper. In the related websites of the Chinese and foreign patent offices, by using damming liquid as a keyword for caliber retrieval, hundreds of patent publications relating to the damping liquid of the shock absorber or the hydraulic cylinder can be retrieved, and the application range is wide. For example, table 1 summarizes the patent publications retrieved by the chinese patent office for the caliber retrieval using "damping fluid" as the keyword.
TABLE 1 representative application fields and uses of damping fluids disclosed by the Chinese patent office
The interface of the damping fluid in the shock absorber is made of metal, most of the damping fluid is oil of lubricating oil, and the oil can prevent the metal in the shock absorber from being corroded in the service process, the damping fluid in the table 1 is basically oil, and the damping fluid listed in the table 1 can only be related to the damping fluid in the invention, but not closely related. The damping fluid is water-based, and the water-based damping fluid cannot be directly connected with a metal interface in the shock absorber, and the connection interface is usually rubber. Most of the oil-resistant rubber is swelled to a greater or lesser extent when meeting grease because the oil-resistant rubber is scarce in variety and high in price, and the water-based damping fluid is adopted, so that the rubber can be prevented from swelling when meeting oil, and metal corrosion in the shock absorber is not necessary to worry because the damping fluid is not directly connected with the metal. Table 2 summarizes the formulation of the damping fluid disclosed in the Chinese patent office and closely related to the aqueous damping fluid of the present invention.
TABLE 2 aqueous damping fluid formulation for hydraulic mount of automobile disclosed by the Chinese patent office
As can be seen from table 2, one: the main material of the water-based damping fluid is glycols, wherein ethylene glycol is the most common, and the wide temperature property and the low cost property of the ethylene glycol meet the requirements of the automobile industry; the glycol is not only used for suspending an automobile engine, but also used for replacing water for cooling the engine by an automobile water tank, and is very common; the automobile industry commonly refers to a glycol aqueous solution which is used for replacing water for an automobile water tank to cool an engine as an automobile antifreeze solution; the products with different brands are marked out due to different proportions of the ethylene glycol and the water, wherein the freezing point of the automobile antifreeze fluid can reach minus 40 ℃ below zero by a certain proportion of the ethylene glycol and the water.
Two of these are visible from table 2: the "liquid" of the damping fluid in the suspension is not a liquid in the true physical sense, wherein the added magnesium aluminum silicate is a refractory brick powder, or white carbon black, both of which are solids; strictly speaking: the suspension damping fluid should be a liquid containing solid components and having damping effect. Obviously, solid powder is added into glycol with low viscosity, aluminum magnesium silicate adsorbs glycol and the like to form clusters, which is equivalent to greatly improving viscosity and thixotropy, and the damping liquid forming the clusters shuttles through micropores of a suspension net, so that energy consumption quantity or energy consumption speed is greatly improved, or the value of a common 'C' value in a vibration control formula is increased.
However, there is a disadvantage that the degree of firmness of the firebrick powder to adsorb ethylene glycol and the like to form clusters is necessarily limited; when the automobile stops or the automobile engine stops burning, the vibration of the automobile engine disappears, the cluster can generate gravity sedimentation due to the action of a gravity field, and the longer the stopping time is, the more serious the gravity sedimentation is until the cluster is condensed; the engine is restarted and needs a relatively long time to recover or is difficult to recover, and another disadvantage is that the cluster is not firm enough and can generate solid-liquid separation under certain conditions.
It is well known that in the condensed state, there is a gel state in the solid, liquid or gaseous state, which is a common matter, and if the gel state material is used to replace the solid material such as refractory brick powder or white carbon black in table 2 above, it may fundamentally solve the disadvantages of insufficient viscosity due to low molecular weight of ethylene glycol, and further low energy consumption coefficient (C) and the 'solid-liquid cluster' to cause suspension damping fluid.
The invention relates to a concept of 'gel' in a noise reduction damping fluid containing gel for an automobile suspension and a preparation method thereof and application thereof, and the gel (gel), in particular to hydrogel strictly in the polymer industry, is a gel which can not be dissolved in water. More than thousands of gels and preparation methods thereof can be searched in patent websites at home and abroad; among them, well-known gels obtained from animal collagen or plants, such as "pigskin jelly" which is frequently eaten by people or "jelly" which is frequently eaten by children, silicone (gel) gel which is synthesized from silicone and glycol and used for "breast enlargement", gels containing sodium alginate and the like which are used by dentists and the like for "bite impression", and the like; the gel is used for suspending damping fluid, and the viscosity or thixotropic property of the suspending damping fluid can be changed in an initial state, so that the value of energy consumption coefficient C is increased or the vibration frequency is changed; however, automotive engine mounts are often subjected to high-strength and almost endless vibrations, which are harsh service environments, and gels of insufficient mechanical strength "disintegrate" soon after use; meanwhile, if the main component of the suspension damping fluid is ethylene glycol (automobile antifreeze) with a wide working temperature area, the gel and the ethylene glycol are required to have good matching property. Table 3 lists the disclosure and reasons of the invention disclosed by the Chinese patent office which is not suitable for adding the gel into the hydraulic suspension water-based damping fluid of the automobile.
TABLE 3 representative gel types and reasons for their list, which are not suitable for use in hydraulic suspension of automobiles, as disclosed by the Chinese patent office
The main objectives of the invention listing the types of gels that are not suitable for incorporation in automotive hydraulic suspension aqueous damping fluids are: the reference is provided to the inventor later, so that the inventor can select the material of the gel to reduce the 'curve' of the material. For the working condition that the hydraulic mount of the automobile engine is always in high-strength and high-vibration-intensity service, the gel with high mechanical strength needs to be added into the damping fluid, and the research on water-soluble polymers is well known:
the gel with the net space structure has the highest strength, and is synthesized by adopting acrylic acid or acrylamide or acrylonitrile monomers and using methylene as a cross-linking agent, and the gel is a high-strength gel obtained by performing bionics research according to edible fungus structure in 1954 by American agricultural research institute. In the last 70 years, this type of gel has been used in many industries; originally, gels having a network-like spatial structure formed by an acrylamide-based or acrylonitrile-based monomer and a "methylidene group" or the like were widely used, and since about 1980, gels formed by an acrylic acid monomer became mainstream products used in many industries, typically, sanitary products are widely used in diapers for infants or the elderly, which cannot be used for self-care, and sanitary napkins for women. The paper diaper for the infant or the old usually contains 8 g or more of gel dry powder taking acrylic acid as a monomer in each piece, and is used for reducing the using amount of natural wood pulp and improving the quantity of 'absorbed urine'. Obviously, standing at the angle of needing to add high mechanical strength gel in the damping fluid of the automobile engine hydraulic suspension, the addition of acrylic high mechanical strength gel similar to that used in baby diapers should be the first choice of the present invention, and table 4 lists the invention representative of such gel disclosed in the chinese patent office.
TABLE 4 listing representative gels suitable for use in automotive hydraulic suspension aqueous damping fluids as disclosed by the Chinese patent office
The invention with the serial number of 6 in Table 4 or the invention with the patent application number of 99126337.5 in the Chinese patent office, the super absorbent resin of the invention, the hydrogel generated after absorbing water, is considered to be the most suitable for the automobile hydraulic suspension damping fluid, and the reason is that:
mineralogy peers are well known: the material commonly called bentonite by common people is the mineralogical name Montmorillonite (montmorillonites) powder, which belongs to a mineral powder with a layered structure, the layers can slide mutually in a nanometer scale, and the mineral powder is a dislocation damping nano material. Even if the nano material is added into the damping liquid separately, the damping effect is better than that of the 'magnesium aluminosilicate' (a refractory brick powder) added into the three inventions with the serial numbers of 2+3+4 in the table 2, because the interlayer dislocation damping clusters increase the first-order gradient damping compared with the 'magnesium aluminosilicate' clusters; the bentonite is synthesized into acrylic resin, and the 'cluster' damping formed by the 'magnesium aluminosilicate' added in the three inventions with the serial numbers of 2+3+4 in the table 2 is equivalent to the two-stage gradient damping.
The invention provides a clarification of a concept of a noise reduction damping liquid containing gel for an automobile suspension and a preparation method thereof, namely the noise reduction damping liquid:
the noise reduction damping liquid is a concept proposed or created according to the invention effect, and is characterized in that: the damping fluid is used in the damping fluid of the hydraulic mount of the automobile engine, can obviously increase the noise reduction effect, and is named as noise reduction damping fluid.
The control of vibration and noise of an automobile engine is a very complex scientific problem, wherein the relation between the vibration and the noise of the hydraulic mount of the automobile engine is also a very complex scientific problem, although the vibration and the noise control commonly say that the vibration is the parent of the noise, the vibration intensity or the intensity is reduced, the sound pressure level dB (an acoustic intensity) of the noise can be reduced, the human ear can hear the sound at 20Hz to 2 ten thousand Hz, the corresponding sound pressure level has about 2 ten thousand dB values, a contrast curve formed by two groups of contrast values in a frequency-sound pressure level curve is only that all the dB values corresponding to 20Hz to 2 ten thousand Hz are respectively reduced, and the noise index can be reduced. But cannot be realized by 98 percent of the current vibration and control devices or devices.
In most cases, within the range of 20Hz to 2 ten thousand Hz, one part of the frequency band is increased in dB value compared with the blank (comparison group), while the other part of the frequency band is decreased in dB value compared with the blank (comparison group), and after the "sound level" dB (a) value weighted according to the sound curve is decreased, it can be called "noise reduction"; or vibration and noise control as commonly said: for improvements in vibration control and noise control devices or arrangements, "10 or 20 dB reductions are easy, 0.1 dB (a) reductions are extremely difficult"; for those who are not acoustically or non-noise control professionals, it is difficult to understand what an "a" added to dB means, or the difference between dB and dB (a), two acoustic indicators, and the difficulty for those skilled in the art of noise control in dB (a).
On the other hand, for the hydraulic suspension of the automobile engine, the vibration of the automobile engine to the automobile body is reduced, the main force is that the damping rubber component and the shell damping alloy component in the suspension or both contribute to the value K (energy absorption coefficient) in the vibration noise control formula, and the damping fluid only bears the contribution of the value C (energy consumption coefficient) in the formula, and the noise reduction attempt starting from the improvement of the value C is more difficult than the noise reduction attempt taking the value K as the noise reduction cut-in point.
The invention provides a gel-containing noise reduction damping liquid for automobile suspension and a preparation method thereof, and relates to the concepts of 'suspension', 'damping liquid', 'gel' and 'noise reduction damping liquid' involved in the process, related background technologies and the development thereof, and aims to facilitate the understanding of examiners and the like on the invention; the other purpose is to provide reference for the future to improve the same line of hydraulic mount of the automobile engine.
In summary, the following is the description of the prior art: the hydraulic suspension of the automobile engine is distinguished from a hydraulic damper or an automobile damper row, is continuously developed from simple to complex, and is transited from a component or a device to a 'device' level; the damping liquid is transited to the liquid with a quotation mark from the pure liquid or the pure liquid is upgraded to a liquid-solid composition layer containing the solid; while the inventor stands in the scientific perspective of the gradient damping design to think that:
the "transition" or "upgrade" (liquid state including solid) should introduce the gel state between the solid state and the liquid state as a gradient transition, and more optimally: the solid state with dislocation function is embedded into the gel to form a novel gel which is added into the liquid damping liquid matrix, and the constructed gradient damping overcomes the defects of solid-liquid separation or gravity sedimentation and the like caused by the 'transition' or 'upgrade' and can bring unexpected technical effects, such as 'noise reduction' effect and the like.
Disclosure of Invention
To what automobile engine hydraulic pressure suspension damping fluid prior art exists: the technical defects of poor damping gradient caused by too fast liquid-solid upgrading, unreasonable upgrading gradient and the like are overcome, and unexpected technical effects in the field of vibration and noise control are found; the invention aims to provide a noise reduction damping liquid containing gel for an automobile suspension and a preparation method thereof; in particular to a formula of a novel damping fluid for improving the noise reduction function of a front suspension of a household car engine and a preparation method thereof.
The invention also aims to: a novel gel efficient noise reduction system taking hydrogel containing mineral powder as hydraulic suspension damping fluid is developed in a 'throwing brick jade' form, the novel solution or suspension type hydraulic suspension damping fluid is gradually replaced, and a novel special hydrogel material is introduced into the suspension damping fluid to improve the quality and social benefits of vibration reduction and noise reduction elements. It is either:
throwing out a 'rough brick' which introduces SAP containing montmorillonite powder and acrylic acid co-cluster into the automobile hydraulic suspension damping fluid, and leading out a 'same line' which introduces SAP containing various natural mineral powder and acrylic acid co-cluster, such as copolymerization SAP of acrylic acid and attapulgite, diatomite, talcum powder, perlite powder, mica powder and the like, for the automobile hydraulic suspension damping fluid, and creating a series of 'beautiful jade' which is a novel automobile hydraulic suspension gel damping fluid with lasting vibration reduction, high noise reduction efficiency and low cost, thereby improving the social benefit of the patent.
The technical scheme adopted for realizing the aim of the invention is as follows:
a noise reduction damping fluid for an automobile hydraulic suspension is composed of a component A and a component B, wherein the component A is acrylic acid-starch-bentonite ternary copolymerized Super Absorbent Polymer (SAP) hydrogel, and the component B is chemically pure ethylene glycol; the mixture ratio of the two is as follows: the component A accounts for 48 wt.% to 50 wt.% of the damping fluid, and the component B accounts for 50 wt.% to 52 wt.% of the damping fluid.
The component A is formed by a hydrogel structure formed by absorbing deionized water 11-15 times of the weight of acrylic acid-starch-bentonite ternary copolymerized high water-absorbent resin powder;
the component A absorbs super absorbent resin powder used before deionized water forms hydrogel, and the particle size distribution end value of the powder ranges from 0.15mm to 0.25 mm;
the A component absorbs the super absorbent resin powder used before deionized water forms hydrogel, and the content of the residual monomer of the powder is in the range of 110ppm to 200 ppm.
The preparation steps, conditions and method of the noise reduction damping liquid containing gel for the hydraulic suspension of the automobile are as follows:
the first step is as follows: selecting materials:
taking 1 g of super absorbent resin powder which passes through a 60-mesh Taylor standard sieve for acrylic acid-starch-bentonite ternary polymerization; adding 1 g of the resin powder into a beaker containing 1000 ml of deionized water, starting a magnetic stirrer, enabling the stirring speed of a rotor on the stirrer to reach 60 r/min, stirring for 10 hours, sealing the opening of the beaker by using a 200-mesh metal nickel screen, filtering to obtain clear liquid, standing the clear liquid for 24 hours, taking 10 ml of the clear liquid on the clear liquid, analyzing the content of the residual monomers on a liquid chromatograph, or analyzing the content of acrylic acid which does not generate polymerization reaction, wherein the content of the residual monomers is in the range of 110ppm to 200ppm, or the content of the residual monomers is in the range of 110 microgram/g to 200 microgram/g, selecting the resin powder, and selecting the resin powder beyond the range.
The second step is that: screening:
placing a 60-mesh Taylor standard sieve and a 100-mesh Taylor standard sieve in a laminated manner, placing the 60-mesh Taylor standard sieve above the 100-mesh sieve, pouring acrylic acid-starch-bentonite ternary polymerization super absorbent resin powder into an upper-layer sieve of the laminated sieve constructed by the 60-mesh Taylor standard sieve and the 100-mesh Taylor standard sieve, and shaking the laminated sieve for sieving to obtain three kinds of powder, namely coarse powder, coarse powder and fine powder, wherein the coarse powder is the super absorbent resin powder which cannot pass through the 60-mesh Taylor standard sieve and is retained in the 60-mesh Taylor standard sieve; the coarse powder is as follows: the super absorbent resin powder which can pass through a 60-mesh Taylor standard sieve but can not pass through a 100-mesh Taylor standard sieve and is retained in the 100-mesh Taylor standard sieve is acrylic acid-starch-bentonite ternary polymerization super absorbent resin powder with a particle size distribution end value range of 0.15mm to 0.25mm to be obtained by sieving, the powder retained in the 100-mesh Taylor standard sieve is packaged in a self-sealing bag and is retained for standby, and the fine powder is powder passing through the 100-mesh Taylor standard sieve, and the fine powder and the coarsest powder are retained for other use.
The third step: constructing a component A:
at room temperature, according to the weight ratio of 1 part of super absorbent resin powder to 11 parts to 15 parts of deionized water, or the following steps: 1 kg of the resin powder is mixed with 11 kg to 15 kg of deionized water; firstly, pouring weighed deionized water into a bucket, scattering super absorbent resin powder on the water surface in batches according to the proportion, manually stirring until the water surface powder is uniformly distributed into the water, then scattering a second batch of super absorbent resin powder on the liquid surface in the bucket, stirring, and repeating until all the super absorbent resin powder is scattered into the bucket; after checking that the resin powder scattered into the barrel is free of agglomeration, standing for 24 hours to ensure that the resin powder absorbs water to ensure that the resin particles absorb water uniformly inside and outside, thereby obtaining super absorbent resin hydrogel which is the component A, and completing the step of constructing the component A;
the fourth step: preparing damping liquid:
at room temperature, firstly, pouring weighed ethylene glycol into a batching barrel, wherein the purity of the ethylene glycol is chemical purity, then pouring the weighed component A into the batching barrel, inserting a stirring paddle rotating at 60 revolutions per minute into the batching barrel, and stirring the mixture in the batching barrel for 15 minutes; the mixing proportion of the two is as follows: the component A accounts for 48 to 50 wt.% of the mixture, and the balance is ethylene glycol; or ethylene glycol in a proportion of 50 wt.% to 52 wt.% of the mixture; the mixture is a prepared target product, namely the noise reduction damping liquid containing the gel.
The fifth step: bench test control characterization
The automobile rack is constructed according to the installation structure of an automobile engine in an automobile, and the rack is installed in a factory building with a large space (as shown in figure 1), so that an acoustic test is close to a free field as much as possible, the influence on the test precision caused by repeated superposition of acoustic reflection of a factory building wall is avoided, wherein the linear distance from an acoustic probe to the factory building wall is not less than 25 square meters, and the distance from the acoustic probe to the height of the factory building is not less than 6 meters. The control assay method was:
one is as follows: ambient noise subtraction control test: during the measurement, the measured engine is not started and other sound sources in the plant are shut down, the environmental noise is measured, and then the target noise is measured, wherein the difference between the environmental noise and the target noise is more than 8dB (A). To ensure acoustic measurement accuracy.
The second step is as follows: the noise reduction effect of the product with the original damping fluid formula is used as a blank and a reference. And measuring each new formula of the damping fluid, respectively filling the new formula into the commodity front suspension of the same model, and performing contrast noise reduction measurement by taking the original formula of the damping fluid of the model as a blank. The test was carried out in this "good to good" manner.
The beneficial effects of the invention are mainly shown as three:
one is as follows: in the field of hydraulic suspension damping fluid of automobile engines, the 'acrylic acid-starch-bentonite ternary' network copolymer is introduced into the damping fluid formula for the first time, and compared with the original 'ethylene glycol + propylene glycol + triethanolamine + magnesium aluminum silicate' quaternary mixture formula, the damping fluid has a remarkable noise reduction effect. Fig. 2 is a representative data test chart showing such noise reduction effect highlighting, revealing: compared with the prior general use of the 'quaternary mixture formula', the novel damping fluid formula has the noise reduction of 2.001dB (A), and lays a practical foundation for improving the riding comfort of the household car.
The second step is as follows: noise control is well known in the art: test results were obtained for the total reduction in sound pressure level of the full spectrum or near full spectrum plot of the control test, one view being: "meet but not meet", another view is that it is impossible to achieve without extensive testing on the basis of fine new material screening. The present invention achieves the latter (total reduction of sound pressure levels near the full spectrogram). FIG. 3 is a graph of the data from a full spectrum of a representative control experiment, with frequency on the horizontal axis and sound pressure level on the vertical axis, showing that the sound pressure levels obtained by denoising the new formulation of the present invention are lower than those obtained from the old formulation within 40Hz to 2 ten thousand Hz, and the human ear can hear the sound at frequencies of 20Hz to 2 ten thousand Hz, or at the internationally specified dB (A) value. The sound frequency range can be heard by human ears at 20Hz to 20000Hz, compared with the prior formulation, the novel formulation of the damping fluid only has the short frequency range of 20Hz to 40Hz, and the sound pressure level of the novel formulation is higher than that of the prior formulation; the
And thirdly: the long-term application experience of the reticular cross-linked polyacrylate or the multipolymer thereof in the agriculture, forestry and physiological product industries shows that the production cost of the dry product is low, and the ton cost of the hydrogel product is almost in direct proportion to the water absorption multiplying power after the hydrogel product absorbs water. The advantage promotes that the cost of the original automobile glycol damping fluid can be reduced after the glycol is replaced in the damping fluid. Particularly, for the domestic car in the tropical countries, the suspension damping fluid of the damping fluid uses the reticular cross-linked polyacrylate or the multipolymer thereof to the maximum extent, the cost is low, the market competitiveness of the car suspension can be improved, and the damping fluid has huge market potential in the domestic car industry in the tropical countries.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic diagram of an engine bench test operating condition environment provided by an embodiment of the present invention. FIG. 1 is an automotive engine; 2, hydraulic suspension; 3 is the horizontal distance between the hydraulic mount and the acoustic probe, and the specific numerical value is 1 meter; 4, an acoustic probe of the vibration noise tester; 5 is the longest distance between the tested automobile engine and the engine teaching factory building in the horizontal direction, and the value is 38 meters; 6 is the shortest distance between the tested automobile engine and the engine teaching factory building in the horizontal direction, and the value is 26 meters; and 7, the distance between the tested automobile engine and the noise reduction ceiling of the pore plate of the engine teaching factory building in the vertical direction is 8 meters.
Fig. 2 is a diagram of a representative noise reduction effect provided by an embodiment of the present invention. In the figure, a
Fig. 3 is a diagram of a representative spectrum analysis provided by an embodiment of the present invention. FIG. 1 is a graph showing the frequency-sound pressure correlation of noise generated by the operation of an engine to which a blank hydraulic mount for comparison is attached; 2 is the frequency-sound pressure curve of the noise generated by the operation of the engine when the hydraulic mount containing gel is installed on the engine.
Detailed Description
The present invention is further illustrated by the following specific examples.
In the following examples, component A is acrylic acid-starch-bentonite terpolymer super absorbent resin (SAP) hydrogel, and component B is chemically pure ethylene glycol; the mixture ratio of the two is as follows: the component A accounts for 48 wt.% to 50 wt.% of the damping fluid, and the component B accounts for 50 wt.% to 52 wt.% of the damping fluid.
The component A is formed by a hydrogel structure formed by absorbing deionized water 11-15 times of the weight of acrylic acid-starch-bentonite ternary copolymerized high water-absorbent resin powder; the particle size distribution end value range of the water-absorbent resin powder is 0.15mm to 0.25 mm; the distribution range of the residual monomers is 110ppm to 200 ppm.