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WO2024239274A1 - Compositions aqueuses d'amortissement acoustique, et articles et ensembles obtenus à partir de celles-ci - Google Patents

Compositions aqueuses d'amortissement acoustique, et articles et ensembles obtenus à partir de celles-ci Download PDF

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Publication number
WO2024239274A1
WO2024239274A1 PCT/CN2023/096041 CN2023096041W WO2024239274A1 WO 2024239274 A1 WO2024239274 A1 WO 2024239274A1 CN 2023096041 W CN2023096041 W CN 2023096041W WO 2024239274 A1 WO2024239274 A1 WO 2024239274A1
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WIPO (PCT)
Prior art keywords
acoustic damping
aqueous
weight
damping composition
parts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2023/096041
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English (en)
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WO2024239274A9 (fr
Inventor
Chongyu ZHU
Qi Chen
Yuan Zhao
JinFeng ZHONG
Xuewen Zhang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henkel China Co Ltd
Henkel AG and Co KGaA
Original Assignee
Henkel China Co Ltd
Henkel AG and Co KGaA
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Publication date
Application filed by Henkel China Co Ltd, Henkel AG and Co KGaA filed Critical Henkel China Co Ltd
Priority to CN202380098558.5A priority Critical patent/CN121175384A/zh
Priority to PCT/CN2023/096041 priority patent/WO2024239274A1/fr
Publication of WO2024239274A1 publication Critical patent/WO2024239274A1/fr
Publication of WO2024239274A9 publication Critical patent/WO2024239274A9/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02—Emulsion paints including aerosols
    • C09D5/024—Emulsion paints including aerosols characterised by the additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular

Definitions

  • the present disclosure relates to aqueous acoustic damping compositions for motor vehicle applications, articles and assemblies therefrom, especially an aqueous acoustic damping composition with good anti-shocking performance at low temperature.
  • the aqueous acoustic damping compositions can be used, for example, in automotive industrial applications.
  • LASD liquid-applied acoustic damping
  • LASD compositions can be characterized as either aqueous or non-aqueous systems.
  • aqueous systems In comparison to non-aqueous LASD coatings, aqueous systems have undoubted advantages such as easier design, wider damping range, less VOC emission, and lower cost.
  • their drying performance in bakeable or air-dried conditions is often with narrow temperature window and may often lead to large blisters and cracks.
  • the adhesion of aqueous LASD coatings can be greatly affected by the targeted surfaces.
  • aqueous LASD composition with both good anti-shocking performance at low temperature (equal to or less than -20°C) , and good acoustic & vibration damping performance at ambient temperature (-10°C ⁇ 60°C) .
  • aqueous acoustic damping composition prepared from a curable aqueous composition comprising at least an acrylic polymer; at least a filler; a starch, an ester based anti-shocking agent and a rosin ester, which provides very good balance between the damping performance and anti-shocking performance at low temperature.
  • the present invention relates to a curable damping coating composition, comprising: a) an acrylic polymer, b) at least a filler, c) a starch, d) an anti-shocking agent, and e) a rosin ester, wherein the anti-shocking agent being an ester based anti-shocking agent.
  • the present invention is directed to a damping coating comprising a cured product of the aqueous acoustic damping composition according to present invention.
  • Figure 1 shows the damping coefficient measurement results of E5, CE5, CE8 and CE9.
  • ambient temperature refers to a temperature in the range of -10°C. to 60°C., inclusive.
  • low temperature refers to a temperature in the range of equal to or less than -20°C., preferably -30°C. to -20°C., inclusive.
  • polymer is used herein consistent with its common usage in chemistry. Polymers are composed of many repeated subunits. The term “polymer” is used to describe the resultant material formed from a polymerization reaction.
  • acrylic refers to both or any one of “acrylic” and “methacrylic” .
  • alkyl refers to a monovalent group that is a residue of an alkane and includes straight-chain, branched, cyclic, and bicyclic alkyl groups, and combinations thereof, including both unsubstituted and substituted alkyl groups. Unless otherwise indicated, the alkyl groups typically contain from 1 to 20 carbon atoms. In some embodiments, the alkyl groups contain 1 to 15 carbon atoms, 1 to 10 carbon atoms, 1 to 6 carbon atoms, 1 to 4 carbon atoms, or 1 to 3 carbon atoms.
  • weight average molecular weight is determined by gel permeation chromatography against a polystyrene standard.
  • Viscosities of the composition compositions may be determined using the Brookfield Viscometer, Model RVT at standard conditions of 25°C and 50%Relative Humidity (RH) .
  • the viscometer is calibrated using silicone oils of known viscosities, which vary from 5,000 cps to 300,000 cps.
  • a set of RV spindles that attach to the viscometer are used for the calibration.
  • Measurements of the damping composition are done at 25°C using the No. 7 spindle at a speed of 20 revolutions per minute for 1 minute until the viscometer equilibrates.
  • softening point refers to the temperature at which a material, such as a polymer, loses its solid characteristics and becomes relatively fluid.
  • a material's softening point as given herein is that temperature measured using the standard ball and ring method according to ASTM E28.
  • the glass transition temperature (T g ) is determined by differential scanning calorimetry (DSC) employing a 20 K/min ramp rate and midpoint measurement in accordance with DIN 53 765.
  • an aqueous acoustic damping composition comprising at least an acrylic polymer; at least a filler; a starch, an ester based anti-shocking agent, and a rosin ester.
  • the aqueous acoustic damping composition further comprises a surface-active agent, and/or a thickener, and/or an expandable microsphere, and/or a coalescent agent, and/or a colorant, and/or a biocide, and/or a defoaming agent.
  • the liquid phase of the aqueous acoustic damping composition includes water.
  • the acrylic polymers suitable for present invention are in dispersed (emulsified) form and may be selected from any of the acrylic polymeric materials conventionally used in aqueous compositions capable of forming vibration and/or damping coatings on substrate surfaces.
  • Preferred acrylic polymers include dispersions of acrylate polymers and copolymers (sometimes referred to in the art as acrylic resins) such as, for example, copolymers of lower alkyl (meth) acrylates such as n-butyl acrylate with comonomers such as styrene and/or acrylonitrile are also preferred for use.
  • Mixtures of the aforedescribed polymers may be used and may be preferred for purposes of obtaining the desired combination of properties in the final cured coating.
  • aqueous dispersions of the acrylic polymer are generally obtained with a solids content of greater than 45%by weight, preferably greater than 50%.
  • the amount of the acrylic polymer in the composition is from 5 to 20 parts by weight, or from 5 to 15 parts by weight, or from 5 to 11 parts by weight, or from 7 to 10 parts by weight.
  • Present invention comprises one or more inorganic fillers in particulate form being incorporated into the aqueous compositions for the purpose of providing bulk to the dried coating, adjusting the hardness of the dried coating, improving the sound or vibration damping properties of the dried coating, controlling blistering of the dried coating, and/or modifying the flammability of the dried coating, among other purposes.
  • the inorganic filler (s) may be in any suitable form such as powder, fibrous, needle-like, scale-like, spherical, plate-like, and other shapes known in the art and should be insoluble in water.
  • the surface of fillers can be either coated with hydrophilic/hydrophobic small molecules/polymer or without any modification.
  • inorganic fillers suitable for use include, but are not limited to, calcium carbonate, silica, alumina, clay, talc, mica, diatomaceous earth, glass powder or fibers, aluminum hydroxide, perlite, barium sulfate, magnesium carbonate, calcium dihydrate, rock wool, asbestos, wollastonite, zeolite, glass or ceramic microspheres, graphite, and the like and mixtures thereof.
  • Preferred inorganic fillers includes calcium carbonate, silica, alumina.
  • the amount of inorganic filler in the composition is particularly at least 55 parts by weight, or at least 60 parts by weight, or at least 62 parts by weight, or at least 65 parts by weight, or at least 70 parts by weight, or at least 75 parts by weight, of particulate filler of the composition.
  • the drying control agent minimizes the occurrence of cracks and blistering in the damping composition coating films when the coating films are baked and dried.
  • the use of a polysaccharide drying control agent based on cellulose or starch may be desirable with the use of partial water insoluble starch particularly preferred.
  • Modified cellulose or starch, for example phosphorylated cellulose, with partial solubility in water can also be used.
  • ester-based anti-shocking agents suitable for present invention comprises ester compounds are represented by the following formulas:
  • the amount of the ester-based anti-shocking agent in the composition is from 0.3 parts by weight to 6.0 parts by weight, and preferably from 0.4 parts by weight to 5.0 parts by weight, of the composition.
  • R represents any organic group.
  • rosin portion of the rosin ester is, or is derived from, the standard material of commerce known as rosin. Rosin is mainly a mixture of C 20 , tricyclic fused-ring, monocarboxylic acids: whilst pimaric acid and abietic acid are the predominant acids, any one or more of the C 20 cyclic carboxylic acid-containing isomers present in rosin is suitable as the rosin portion of the rosin ester.
  • the or each rosin ester present in the composition to have a softening point of from 40°C to 130°C, preferably from 50°C to 110°C and more preferably from 50°C to 90°C.
  • a softening point of from 40°C to 130°C, preferably from 50°C to 110°C and more preferably from 50°C to 90°C.
  • compositions of the present invention will typically further comprise optional additives, which are necessarily minor components, but which can nevertheless impart improved properties to these compositions.
  • the total amount of optional additives in the compositions will preferably be up to 10 parts by weight, and more preferably from 0.1 to 10 parts by weight or from 0.1 to 7.5 parts by weight, of the composition.
  • the desired viscosity of the compositions will typically be determinative of the total amount of optional additives added.
  • adjunct materials include co-solvents; thickeners; drying control agents; surface-active agents, such as sodium hexametaphosphate, sodium tripolyphosphates or polymer surface-active agents polycarboxylic acids; defoamers; and blowing agents.
  • the aqueous coating compositions of the present invention contain an amount of expandable microspheres effective to improve the surface appearance of the coating formed by heating and drying the composition and/or improve the sound or vibration damping properties of the coating.
  • Expandable microspheres are well known to workers in the field and generally comprise small diameter polymeric shells or bubbles which encapsulate one or more volatile substances such as light hydrocarbons and halocarbons.
  • Suitable expandable microspheres are also available from commercial sources, such as the products sold under the trademark "EXPANCEL” by Casco Nobel AB or Akzo Nobel.
  • the average particle size of the microspheres and temperature at which expansion of the microspheres begins are not believed to be particularly critical. Generally speaking, however, the microspheres will have weight average particle sizes in the range of from about 5 to about 50 microns and onset temperatures of expansion (T start , as measured by thermomechanical analysis) in the range of from about 70°C. to about 160 °C. Mixtures of different expandable microspheres having different average particle sizes and/or different expansion properties may be employed.
  • the aqueous acoustic damping compositions are formulated by simple mixing of the various components. Whilst the order of mixing of the components is not intended to be limited, it may be prudent to first form an aqueous dispersion of the acrylic copolymer and a separate aqueous dispersion of the rosin ester component before mixing said dispersions and the further components. In this scenario, the aqueous dispersion of the rosin ester may, for example, be at a solids content of from 45 to 70 wt. %.
  • the aqueous acoustic damping composition comprises from 5.0 to 30.0 parts by weight of water as a liquid phase.
  • compositions may be prepared well in advance of its application.
  • a concentrated composition may first be obtained by mixing components with only a fraction of the water that would be present in the composition as applied: the concentrated composition may then be diluted with the remaining water shortly before its application.
  • concentrated compositions may be prepared and stored as either single-package concentrates -that can be converted by dilution with water only -or as multi-part concentrates, two or more of which must be combined and diluted to form a complete working composition according to the invention. Any dilution can be affected simply by the addition of water, in particular deionized and/or demineralized water, under mixing.
  • the composition might equally be prepared within a rinse stream whereby one or more streams of the concentrate (s) is injected into a continuous stream of water.
  • compositions contain from 5 to 20 wt. %, preferably from 5 to 15 wt. %, based on the weight of the composition, of water.
  • the composition may be defined by a viscosity of from 10 to 300 Pa. s, for example 50 to 200 Pa. s, as measured using a Brookfield viscometer at 25°C.
  • compositions are applied to a substrate and then cured in situ.
  • exemplary substrates may be metallic, polymeric or combinations thereof.
  • ferrous metals such as iron, steel, and alloys thereof
  • nonferrous metals such as aluminum, zinc and alloys thereof
  • the substrate may be formed from: cold rolled steel; electro-galvanized steel, such as hot dip electro-galvanized steel or electro-galvanized iron-zinc steel; or aluminum.
  • this step can, if applicable, facilitate the subsequent adhesion of the compositions thereto.
  • Such treatments are known in the art and can be performed in a single or multi-stage manner constituted by, for instance, immersion in a waterborne alkaline degreasing bath; treatment with a waterborne cleaning emulsion; treatment with a cleaning solvent, such as carbon tetrachloride or trichloroethylene; and, water rinsing, preferably with deionized or demineralized water.
  • any of the degreasing agent remaining on the surface should desirably be removed by rinsing the substrate surface with deionized or demineralized water.
  • compositions are then applied to the preferably pre-treated, optionally primed surfaces of the substrate by conventional application methods such as: brushing; roll coating; doctor-blade application; printing methods; and, spraying methods, including but not limited to air-atomized spray, air-assisted spray, airless spray and high-volume low-pressure spray.
  • the thickness of the applied coating in the present invention may be adjusted such that the final cured coating is effective in suppressing noise and vibration transmission to the desired extent.
  • the compositions will be applied to a wet film thickness of from 1 to 5 mm.
  • the application of thinner layers within this range is more economical and provides for a reduced likelihood of deleterious thick cured regions.
  • great control must be exercised in applying thinner coatings or layers so as to avoid the formation of discontinuous cured films.
  • the curing of the compositions of the invention typically occurs at temperatures in the range of from 80°C to 200°C, preferably from 90°C to 180°C.
  • the temperature that is suitable depends on the specific compounds present and the desired curing rate and can be determined in the individual case by the skilled artisan, using simple preliminary tests if necessary.
  • An aqueous acoustic damping composition comprising:
  • anti-shocking agent being an ester based anti-shocking agent
  • R 1 , R 2 , R 3 and R 4 each independently representing H or and R 5 representing straight-chain or branched alkyl group having 1 to 18 carbons.
  • aqueous acoustic damping composition of any one of preceding embodiments, wherein the aqueous acoustic damping composition comprises from 0.3 to 6.0 parts by weight of anti-shocking agent.
  • aqueous acoustic damping composition of any one of preceding embodiments, wherein the aqueous acoustic damping composition comprises from 0.4 to 5.0 parts by weight of anti-shocking agent.
  • aqueous acoustic damping composition of any one of preceding embodiments, wherein the rosin ester has a softening point of from 50°C to 130°C, preferably from 60°C to 120°C and more preferably from 70°C to 110°C.
  • aqueous acoustic damping composition of any one of preceding embodiments, wherein the acrylic polymer comprises 10-50%by weight of styrene-based monomers, based on the total acrylic polymer.
  • aqueous acoustic damping composition of any one of preceding embodiments, wherein the aqueous acoustic damping composition further comprises from 0.1 to 1.0 parts by weight of thickener, and/or 0.1 to 0.5 parts by weight of expandable microspheres.
  • aqueous acoustic damping composition of any one of preceding embodiments, wherein, based on the total weight of the aqueous acoustic damping composition, comprises:
  • aqueous acoustic damping composition of any one of preceding embodiments, wherein the aqueous acoustic damping composition comprises from 5.0 to 30.0 parts by weight of water as a liquid phase.
  • a damping coating comprising a cured product of the aqueous acoustic damping composition according to any one of claims 1-12.
  • An article comprising a substrate and a damping coating disposed on the substrate and the second substrate, wherein the damping coating is the cured product of the aqueous acoustic damping composition according to any one of embodiments 1-12.
  • An automotive panel comprises an article of embodiment 15.
  • compositions of the invention comprise the following raw materials at the indicated levels.
  • the compositions were obtained by first adding the liquid materials to a vessel and mixing at 5°C-25°C.
  • the powder filler materials were then added and mixed until a smooth homogeneous paste was obtained.
  • the rheological additives and water were then added with mixing to adjust the desired viscosity. Vacuum is preferred during mixing to reduce the trapped air bubbles.
  • compositions were applied to the substrate by manual brushing.
  • the thickness was controlled from about 1 mm to about 5 mm (e.g., from about 2 to about 4 mm) .
  • the composition was typically baked for at least about 10 minutes, more typically from about 15 to about 30 minutes.
  • E1 to E7, CE1 to CE10 the curing of the compositions was performed at about 150°C for 20 mins.
  • the aqueous acoustic damping compositions of E2 to E7, CE1 to CE10 were prepared in reference to Example 1.
  • the aqueous acoustic damping composition of E2 to E7 and CE1 to CE10 were cured in reference to Example 1. More details are listed in below result part.
  • the damping test was carried out by TWS Michael Schulthes obster test system on the water-based damping coatings prepared in the selected Examples and Comparative Examples.
  • the specific damping test method was tested in accordance with the provisions of GB/T 18258-2000.
  • the size of the steel plate was 240mm ⁇ 10mm ⁇ 1mm.
  • the size of the water-based damping paint was 216mm ⁇ 10mm ⁇ 3.0mm and baked at standard curing conditions. Before testing, the samples were left at room temperature for at least 24 h.
  • the damping coefficient test was carried out under the temperature ranging from -40°C to 60°C and the measurement was tested every 2.5°C when the temperature was stable.
  • the composite loss factor at a frequency of 200 Hz was recorded and normalized by the area density of 3 kg/cm 3 .
  • the damping coefficient measurement results are shown in Table 1.
  • Damping coefficient results are recorded and ranked as follows:
  • the loss factor is equal to or greater than 0.12.
  • compositions were first applied to the substrate by manual brushing.
  • the size of samples was 12cm*8cm with a thickness of 3.5 mm.
  • the samples were left at 25°C and 50%RH for 24h before curing at 150°C for 20 min.
  • Open time test results are recorded and ranked as follows:
  • blister size is greater than 20mm after baking; or sagging is equal to or greater than 2mm after baking.
  • blister size is equal to or greater than 5mm, and equal to or less than 20mm after baking; or surface cracks size is equal to or greater than 20mm.
  • compositions were first applied to the substrate by manual brushing.
  • the size of the applied coating was 16cm*7cm with a thickness of 2 mm.
  • the samples were left at 25C 50%RH for 10 min before curing at 150°C for 20 min.
  • the samples were cooled at 25°C and 50%RH for 24 h and placed at a cold chamber at -30°C for 2h.
  • the cold drop test was performed.
  • a steel ball (diameter: 40mm, weight: circa 250g) was dropped on the backside of the substrate at a height of 400mm.
  • the sample is chipping-off or formed deep cracks down to the substrate;
  • Table 1 shows the aqueous acoustic damping compositions of E1-E7.
  • Table 2 shows testing results of the aqueous acoustic damping compositions E1-E7.
  • the aqueous acoustic damping compositions were prepared according to the formulations provided by the present invention. These formulations especially included the acrylic polymer, filler, starch, anti-shocking agent, and rosin ester. It can be seen that when the contents of the claimed components of the present invention are within certain ranges, anti-shocking agent can act synergistically with rosin ester such that the prepared aqueous acoustic damping compositions have both good acoustic performance and good anti-shocking performance at low temperature (represented by the cold drop test result) is demanding.
  • the aqueous acoustic damping composition comprises a suitable anti-shocking agent in an amount of at least 0.44 parts by weight.
  • E1 to E6 show that the acoustic performance improved with the increase of the anti-shocking agent.
  • Table 3 shows the aqueous acoustic damping compositions of CE1-CE10.
  • Table 4 shows testing results of the aqueous acoustic damping compositions CE1-CE10.
  • the aqueous acoustic damping compositions were prepared without anti-shocking agent.
  • the cured aqueous acoustic damping compositions can’t pass cold drop test, and then don’t have good anti-shocking performance at low temperature.
  • the aqueous acoustic damping compositions were prepared without rosin ester.
  • the cured aqueous acoustic damping compositions don’t have desired anti-shocking performance at low temperature either.
  • the amount of anti-shocking agent is higher than the desired amount. It can be seen that excess amount of anti-shocking agent has negative impact on open time.
  • the amount of anti-shocking agent in comparative example 7 is less than desired amount, and the aqueous acoustic damping composition with insufficient amount of anti-shocking agent can’t pass the cold drop test.
  • Figure 1 shows the damping coefficient measurement results of E5, CE5, CE8 and CE9.
  • aqueous acoustic damping compositions focus on some properties like good acoustic performance and good anti-shocking performance at low temperature (e.g. -30°C) .
  • the aqueous acoustic damping compositions don’t comprise any anti-shocking agents but conventional plasticizers, such as DOA or DINP.
  • CE8, CE9 and E5 comprise the same acrylic emulsion as main polymer.
  • the aqueous acoustic damping compositions without anti-shocking agents have a loss factor of less than 0.12 in the temperature range of 20°C to 30°C.
  • the conventional plasticizers, such as ester compounds DOA and DINP, which play a role as small molecule plasticizer could increase the flexibility of the aqueous acoustic damping compositions, thus the samples could pass the cold drop test.
  • the conventional plasticizers move the loss factor peek value of the polymer compositions to lower temperature range, which gives a negative impact on the acoustic damping performance. Without the anti-shocking agent, the damping tests failed.
  • aqueous acoustic damping compositions comprising both ester-based anti-shocking agent and rosin ester have good acoustic performance and good anti-shocking performance at low temperature simultaneously.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

La présente invention concerne une composition aqueuse d'amortissement acoustique comprenant un polymère acrylique, au moins une charge, un amidon, un agent anti-choc et un ester de colophane, l'agent anti-choc étant un agent anti-choc à base d'ester. La composition aqueuse d'amortissement acoustique peut être utilisée en tant que revêtement d'amortissement acoustique, par exemple, dans des applications d'amortissement acoustique par application d'un liquide aqueux dans l'industrie automobile, qui permet d'obtenir de très bonnes performances anti-choc à basse température (inférieure à -20 °C) ainsi que de bonnes performances acoustiques.
PCT/CN2023/096041 2023-05-24 2023-05-24 Compositions aqueuses d'amortissement acoustique, et articles et ensembles obtenus à partir de celles-ci Pending WO2024239274A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202380098558.5A CN121175384A (zh) 2023-05-24 2023-05-24 水性声阻尼组合物及其制品和组件
PCT/CN2023/096041 WO2024239274A1 (fr) 2023-05-24 2023-05-24 Compositions aqueuses d'amortissement acoustique, et articles et ensembles obtenus à partir de celles-ci

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PCT/CN2023/096041 WO2024239274A1 (fr) 2023-05-24 2023-05-24 Compositions aqueuses d'amortissement acoustique, et articles et ensembles obtenus à partir de celles-ci

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WO2024239274A9 WO2024239274A9 (fr) 2025-11-20

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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