CN1599663A - Underbody sound damping structure for motor vehicles - Google Patents

Underbody sound damping structure for motor vehicles Download PDF

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Publication number
CN1599663A
CN1599663A CNA028240634A CN02824063A CN1599663A CN 1599663 A CN1599663 A CN 1599663A CN A028240634 A CNA028240634 A CN A028240634A CN 02824063 A CN02824063 A CN 02824063A CN 1599663 A CN1599663 A CN 1599663A
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China
Prior art keywords
underbody
epoxy
noise elimination
acryloyl group
resin
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CNA028240634A
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Chinese (zh)
Inventor
今井宏治
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3M Innovative Properties Co
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3M Innovative Properties Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B05D7/16—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies using synthetic lacquers or varnishes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • B60R13/0861—Insulating elements, e.g. for sound insulation for covering undersurfaces of vehicles, e.g. wheel houses

Abstract

Provided is an underbody sound damping structure capable of damping stone chipping with a low cost. An underbody sound damping structure for motor vehicles, characterized by having an acryl-epoxy type heat-cured layer on the coating surface of a steel panel coated with a primer.

Description

The noise elimination structure of motorcar body base plate
Invention field
The present invention relates to the noise elimination structure of motorcar body base plate.
Background of invention
The motor vehicle run duration, often have the cracked formation motorcar body of stone one type objects bottom (as shown in Figure 4, the rear portion of base plate A, wheelhouse portions part B, the underbody of bottom girder C etc. sends the cracked noise of stone.In order to protect body bottom, to exempt from the influence of cracked noise of stone and corrosion, on scribbling the steel substrate of priming paint, Vehicular side body and bottom apply one deck priming coat up to now.In high-grade car, scribble one deck resin bed, but,, do not adopt resin bed for cost consideration for mass car, priming coat (as polyvinyl chloride (PVC)) only is provided.In this class plain edition car, in order to improve resistance to corrosion, obtain the noise elimination effect with low cost again simultaneously, can adopt the method that applies thick priming coat.Yet because the priming coat drop, tare increases, and factor such as cost increase, can only make primer thickness be defined in about 1,200 μ m.In order to address these problems, Japanese uncensored patent disclosure (Kokai) 2-202560 has proposed a kind of protective coating that motorcar body is used, and wherein blowing agent is added in the priming coat, can increase coating thickness and be unlikely to increase tare again.Yet motorcar body adopts this protective coating, and in the automobile making process, foaming layer is very inhomogeneous sometimes, perhaps produces bubble at coating surface.And, even on priming paint, paste the common pressure sensitive adhesive tape of one deck, owing to making adhesive layer be easy to peel off, the existence of the plasticizer of priming coat becomes a kind of shortcoming.
Summary of the invention
The noise elimination structure that the purpose of this invention is to provide a kind of underbody, it can stop the cracked noise that sends of stone.This infrastructure cost that the present invention can provide is cheap.
Noise elimination structure according to underbody provided by the invention contains acryloyl group-epoxies heat cure layer, and it is coated on the coated side of the motor vehicle steel substrate that scribbles priming paint.
According to the present invention, the acoustical absorptivity that the motorcar body base plate of making has is more than or equal to conventional resin bed, and is higher than the sort of situation that directly applies priming coat on steel substrate.It is with low cost that the present invention also has an advantage.
Brief Description Of Drawings
Shown in Figure 1 is the cross-sectional view of floor panel structure for automobile body in one embodiment of the present invention.
Figure 2 shows that the sound level meter schematic diagram.
Figure 3 shows that the sound level figure that each embodiment is measured.
Figure 4 shows that the schematic diagram of the underbody that constitutes the motor vehicle bottom.
The detailed description of the invention
According to the noise elimination structure of motorcar body base plate of the present invention, comprise scribbling priming paint and acryloyl group-epoxies cured layer. It is one deck bottom that steel substrate is coated with through cation or anionic electrodeposition deposition plating method usually; acryloyl group-epoxies cured layer has rustproof property; also have and inter coat and/or top coat adhesive property; therefore usually not necessarily need priming coat, but priming coat is applied on the cured layer generally.
Acryloyl group-epoxies cured layer is by containing the acryloyl group-pressure-sensitive adhesive mucous membrane of epoxies curable resin or being solidified to form of adhesive tape. Pressure-sensitive tape or tacky film can be used to make underbody noise elimination structure of the present invention, after priming paint or inter coat and/or top coat coating, can under certain baking temperature, for example carry out heat cure at 80-180 ℃. Require this class adhesive tape or tacky film to have shatter-resistant (stone is cracked) and anti-plasticizer effect is arranged.
Pressure-sensitive tape or the tacky film that can satisfy this requirement comprise acrylic polymer, contain the thermosets of epoxy and thisly contain the thermal curing agents that epoxy material is used.
Radiation polymerization by acrylic monomers is made acrylic polymer, and this polymer can be made pressure-sensitive tape or tacky film shape, and gives viscosity simultaneously.Generate for convenience, the glass transition temperature of this acrylic polymer is preferably in-25 ℃-200 ℃.
Contain moisture if pressure-sensitive tape or tacky film absorb, then afterwards in the heating process, expand because the water volume increase causes this adhesive tape or tacky film to foam.Can cause delamination like this, flake from steel substrate or priming paint.Therefore, the monomer of formation acrylic polymer preferably has following properties.The monomer that is applicable to acrylic polymer is the polymerisable acrylic monomers of irradiation, and what this acrylic monomers presented is 10-14 (cal/cm as the homopolymers solubility parameter 3) 0.5This acrylic monomers does not preferably have nitrogen-atoms in its molecule." irradiation " speech here comprises the ray with energy in a broad sense, as can trigger the various light of its polymerisation by the irradiation acrylic monomers.The object lesson of this lightlike line comprises ultraviolet ray and electron beam.Here used " solubility parameter (SP) " speech is defined by following formula:
Solubility parameter (SP)
δ = Σ i ei Σ i vi
Wherein, Δ e iBe to form each atom of homopolymers or the evaporation energy of functional group, and Δ v iBe to form each atom of homopolymers or the volume of functional group. Polymer Engineeringand ScienceVol.14 among the No.2 (Polym Eng Sci) (in February, 1974), has been described in detail the definition of this solubility parameter in " solubility parameter of liquid and the assay method of molecular volume " literary composition of being write by Robert F.Fedors.
Preferably contain acrylic polymer 40-250 weight portion in the epoxy material in containing of per 100 weight portions.If acrylic polymer content is less than 40 weight portions, then this pressure-sensitive tape or tacky film almost can't be kept its effective constant shapes, become very crisp under many occasions.On the other hand, if acrylic polymer content surpasses 250 weight portions, then the cross-linked state of heat cure pressure sensitive adhesive tape or viscose glue can not be satisfactory, easily presents low heat resistanceheat resistant performance or final adhesive property is very poor.
Acrylic monomers, its solubility parameter as homopolymers is 10-14 (cal/cm 3) 0.5, account for the 50-100% of whole acrylic monomers material weight.If acrylic monomers content in this scope, then with contain the epoxy thermosetting material can fine the mixing, and can finely mix the curing process that quickens to contain epoxy material with other component.Also have, except above-mentioned solubility parameter 10-14 (cal/cm 3) 0.5Outside, the solubility of acrylic monomers in 25 ℃ of water is preferably 0.2 weight %.Owing in water, have this solubility, make pressure-sensitive tape or tacky film have excellent humidity resistance.
Specifically, the acrylic monomers example that is suitable for comprises the 2-phenoxyethyl acrylate, benzyl acrylate, phenyl acrylate, phenylethyl, acrylic acid two cyclopentene esters, acrylic acid two cyclopentene 2-ethoxyethyl acetates and acrylic acid three ring [5.2.1.0 2,6] last of the ten Heavenly stems ester.They can be used singly or in combination.What wherein acrylic monomers was more suitable is the 2-phenoxyethyl acrylate, benzyl acrylate, phenyl acrylate, or their mixture.Fortunately these acrylic monomers markets are on sale, for example the commodity " Biscoat#192 " by name and " Biscoat#160 " of the Yuki Kagaku company of Osaka product.
Because the humidity resistance of acrylic monomers excellence is carried out the quality control of pressure-sensitive tape or tacky film easily, for example says in the winter time and will avoid its dewfall, there is no need pressure-sensitive tape or tacky film placed in the drier or with drier and place.And even in pressure-sensitive tape or tacky film, contain before epoxide resin material is heating and curing, long-term no words under hot and humid condition, this adhesive tape or tacky film are nonhygroscopic substantially.
In the embodiment of this invention, if needed, acrylic monomers can generate acrylic polymer with other vinyl monomer.The vinyl monomer that adds usefulness does not have any restriction, but in an embodiment, can comprise with acrylic acid-2-ethyl caproite, butyl acrylate is (methyl) epoxy with alkyl of representative, and (methyl) isobornyl acrylate, (methyl) glycidyl acrylate, (methyl) hydroxyethyl acrylate, (methyl) acrylic acid ethoxy ethyl ester, (methyl) acrylic acid, (methyl) acrylic acid-2-methoxyl group ethyl ester and ethyl acetate.
As monomer component, acrylic monomers generally contains the polyfunctional group acrylic monomers of a vinyl in a molecule, but also can contain the polyfunctional group acrylic monomers of two above vinyl.The example of this polyfunctional group vinyl monomer comprises diacrylate-1,4-butanediol ester and 1,6-hexylene glycol diepoxy.Usually preferably per 100 parts of acrylic monomers contain the polyfunctional group acrylic monomers of 0-5 weight portion.
In order to guarantee its high moisture energy, be used for constituting pressure-sensitive tape or tacky film acrylic polymer acrylic monomers can with such as N, the N-DMAA, N-ethyl caprolactam, the N-vinyl pyrrolidone, acryloyl morpholine uses with the nitrogenous vinyl monomer of acrylonitrile one class, in order to improve and the compatibility that contains epoxy material.For example per 100 parts of acrylic monomers contain the nitrogenous vinyl monomer of 0-10 weight portion.
Acrylic polymer is by contain the polymerisation generation that monomer takes place acrylic monomers in the presence of initiators for polymerization.Here the initiators for polymerization of Cai Yonging preferably can produce the initiators for polymerization of free radical under the irradiation of making radiation source such as ultraviolet ray.An example of the initiators for polymerization that is suitable for is 1,2-dimethoxy-1, and 2-diphenylethane-1-ketone can be buied from Ciba Geigy company, commodity are by name " Irgacure651 ".
When carrying out polymerisation, except initiators for polymerization, also to add chain-transferring agent, in order to reduce the molecular weight of the polymer that the acrylic monomers irradiation polymerization forms.Add chain-transferring agent and can control the molecular weight of acrylic polymer, make adhesive composition have suitable fluidity of molten thus.The object lesson of spendable chain-transferring agent comprises for example halogenated hydrocarbons of carbon tetrachloride and so on, lauryl mercaptan for example, butyl mercaptan, ethyl mercaptan, the sulphur compound of sulfenyl ether and sulfydryl 3-propionic ester and so on.
Contain final adhesive property and heat resistanceheat resistant performance that the epoxy thermosetting material can improve pressure-sensitive tape or tacky film in pressure-sensitive tape or the tacky film.The epoxy material that contains of the useful employing of the present invention is a kind ofly to have an energy at least by the epoxy resin of the epoxide ring of ring-opening reaction polymerization.These contain epoxy material and are referred to as " epoxides " in a broad sense, comprise monomer attitude epoxides and polymeric form epoxides, can be aliphatic series, alicyclic or aromatic compound.Contain each molecule of epoxy material average and have two or more oxygen bases.These materials are called as polyepoxide especially, comprise that having epoxy contains epoxy material, and degree of functionality is slightly smaller than 2.0, for example 1.8 contain epoxy material.The average epoxy radicals number of each molecule is defined as the epoxy radicals number that contains in the epoxy material divided by epoxy molecule sum.Polyepoxide comprises that end has the linear polymer of epoxy radicals (for example diglycidyl ether of polyglycols) and has the polymer (for example polybutadiene polyepoxides) of skeleton epoxy unit.The molecular weight that contains epoxy material is at 58-100, and 000 does not wait.If any requiring, also can adopt the various mixtures that contain epoxy material.
Specifically, contain the epoxy thermosetting examples of material, comprise bisphenol A epoxide resin, bisphenol-A D type epoxy resin, bisphenol f type epoxy resin, phenolic resin varnish, cresols varnish epoxy resin, alicyclic ring epoxide resin, isocyanic acid three-glycidyl ester and such as the hydantoins epoxy, contain the heterocyclic ring epoxy resins; Aromatic series or aliphatic epoxy resin as A Hydrogenated Bisphenol A a type epoxy resin and so on; The copolymer of propane diols-diglycidyl ether and penta season tetrol-diglycidyl ether copolymer, the epoxy resin that obtains by reaction between alicyclic carboxylic acid and the chloropropylene oxide; Contain volution epoxy resin; Tetraglycidel ether epoxy resin as positive allyl phenyl phenolic aldehyde Qinghua compound chloropropylene oxide product; And as the tetraglycidel ether epoxy resin that on each hydroxyl ortho position of bis-phenol a type, has allylic diallyl bisphenol compound and chloropropylene oxide product.
Thermal curing agents is used for the above-mentioned epoxy thermosetting material heating that contains and solidifies.Thermal curing agents preferably is made of heat activated compound, thereby pressure-sensitive tape or tacky film act on certain hour and will solidify under suitable heat source.In other words, this thermal curing agents at room temperature has latent heat and solidifies property, and is at first contained the heat cure of epoxy material when being heated by hot activation.The thermal curing agents that is suitable for includes but not limited to dicyandiamide, the organic acid hydrazides, and acid anhydrides, the salt of lewis acid or Bronsted acid is as the imidazoles and the tertiary amine of urea derivative and so on.If needed, these thermal curing agents can be used in combination.
More particularly, the organic acid hydrazides comprises ethylene acid hydrazide as the representative example of thermal curing agents; The representative example of acid anhydrides comprises anhydride phthalic acid, 1,2, and 4-benzenetricarboxylic anhydride, 1,2,4,5-pyromellitic anhydride; The representative example of the salt of lewis acid and Bronsted acid comprises the croak pyridine of boron triflouride-mono aminoethane and boron trifluoride; The representative example of imidazoles comprises 2,4-diaminourea-6-[2 '-methylimidazole-(1 ')]-ethyl-S-triazine, 2,4-diaminourea-6-[2 '-methylimidazole-(1 ')]-ethyl-S-triazine-isocyanuric acid ester, 2-phenyl-4-benzyl-5-hydroxyethyl imidazole and O-phthalic imidazole acid nickel; The example of urea derivative and so on tertiary amine comprises 3-phenyl-1,1-dimethyl urea and 3-p-chlorphenyl-1,1-dimethyl urea.In these thermal curing agents, the imidazoles of urea derivative and tertiary amine do not use separately.This compounds is wanted and dicyandiamide, and organic acid hydrazides or acid anhydrides are used in combination, and just can manifest the effect of its accelerator.
If desired, pressure-sensitive tape or tacky film can contain filler.Filler is the powder of calcium carbonate, silica, aluminium oxide, talcum one class, the microballon filler of silica one class; Also can contain the plasticizer of forming by phthalic acid derivative, adipic acid derivative or liquid rubber, antioxidant, surfactant and the defoamer that constitutes by dimethyl silicone polymer.
If desired, the material of making pressure-sensitive tape or tacky film can also comprise woven fabric, supatex fabric one class.Before pressure-sensitive tape or the shaping of tacky film mat acrylic monomers radiation-induced polymerization, textile impregnation is entered in the material, make pressure-sensitive tape or tacky film vertically strengthen with adhesion strength transversely, machinings such as cutting or punching press are easy.Machining property improves.Here fabric of Cai Yonging or adhesive-bonded fabric are natural or the fabric of artificial synthetic fiber's formation, such as polyester, and nylon, cotton, polypropylene, acetate fiber, acetate, or their mixture.
Because the thickness of acryloyl group-epoxies heat cure layer that aforesaid propylene acyl group-epoxy thermosetting resin forms through curing is thicker, the noise elimination effect is also higher.In order to play sufficiently high noise elimination effect, thickness is preferably 0.1mm.But, consider outward appearance and cost for equilibrium, the thickness of cured layer is more suitable at 0.8-3mm.
Can be used as pressure-sensitive tape of the present invention or tacky film can buy from market, and their example comprises " Tape#9259 (trade name) " that Sumitomo 3M company produces.
Underbody preferably is coated with the last layer priming coat and plays the corrosion protection effect.In the present invention, conventionally can adopt priming coat such as polyvinyl chloride, polyurethane, or acryloyl group priming coat.Yet, consider for balance between the Cost And Performance, adopt the polyvinyl chloride plastisol to make priming coat usually.
In one embodiment, priming coat contains vinyl chloride resin, plasticizer, filler, tackifier and pigment.As vinyl chloride resin, can use vinyl chloride and homopolymers or the copolymer of vinyl chloride vinylacetate, if needed, can also use their mixture.
Normally used plasticizer has DOP (dioctyl phthalate), DINP (diisononyl phthalate), DIDP (diisooctyl phthalate) or high molecular weight polyesters (adipic acid base polyester).
Filler often uses such as calcium carbonate, talcum and fused silica one class inorganic filler.Yet, consider to apply or the workability of japanning that calcium carbonate is the most frequently used a kind of.For tackifier, adopt blocked isocyanate resinoid or polyamine resinoid, epoxy resin and latent curing materials, or their mixture with general fashion.
For pigment, carbon black is as black pigment, and titanium oxide is used as Chinese white, the azo class, and thren class or 1-isoindolinone class pigment are made yellow uitramarine, and phthalocyanine pigment is made blue pigment.In the present invention, these pigment, every kind by a certain amount of appropriate mixing and mixes with the vinyl chloride plastisol component of above-mentioned material, and color controls to about suitable with the electro-deposition color.
The vinyl chloride acrylic sol composition contains mentioned component basically, yet if needed, viscosity modifier or moisture absorption stabilizing agent can be admixed into.The example of viscosity modifier comprises such as silica anhydride, silicate hydrate, particulate calcium carbonate, bentonite one class thickener.In addition, if needed, use the reactivity diluted material in due form.For the moisture absorption stabilizing agent, often adopt calcium oxide one compounds.
There is not any restriction for the ratio that is mixed in each component in the vinyl chloride acrylic sol composition, as long as roughly can be satisfied with electro-deposition plated film aberration.In a representative example, the preparation of compositions for use of the present invention is the plasticizer of the mixed 100-180 weight portion of vinyl chloride resin of per 100 weight portions, the filler of 160-180 weight portion, the tackifier of 2-4 weight portion, the pigment of 2-10 weight portion, and 1-4 weight portion viscosity modifier.
Yet in practical operation, component can not have problems in the above-mentioned scope, the relation of the amount of these batch mixing components can change, as long as in the scope of the problem that does not go out, depend on and wait to mix vinyl chloride resin granules size and mixed proportion, the viscosity of plasticizer etc., and, if needed, can also add other additive.
The thickness of priming coat does not have any restriction, but usually between 0.1-1.0mm.If thickness less than 0.1mm, can cause the problem of corrosion protection difference, and if thickness surpasses 1.0mm, the droplets fall problem can appear.
The manufacturing of underbody noise elimination structure
Fig. 1 is the cross-sectional view of an embodiment of expression underbody noise elimination structure.Underbody noise elimination structure 1 has steel substrate 2, the thermoset resin layer 3 that scribbles on the steel plate, the priming paint that scribbles on this steel plate and priming coat 4.This underbody noise elimination structure adopts acryloyl group-epoxies thermosetting pressure-sensitive tape or tacky film is pasted on the steel substrate that has priming paint; be coated with stacking material of formation that one deck priming coat covers this acryloyl group-epoxies thermosetting pressure-sensitive tape or tacky film then; to this stacking material heating; acryloyl group-epoxies thermosetting pressure-sensitive tape or tacky film are solidified, simultaneously priming coat is toasted.Although do not show among the figure, also can adopt on the outer surface of acryloyl group-epoxies pressure-sensitive tape or tacky film when making the underbody noise elimination structure and not be coated with priming coat.
Stacked again top coat of above-mentioned coating and/or inter coat are become structure of bottom girder, are that method is specifically made below adopting.
At room temperature acryloyl group-epoxies thermosetting pressure-sensitive tape or tacky film are sticked on the steel substrate that scribbles priming paint; be coated with the material layer that laminates that the last layer priming coat obtains to constitute underbody noise elimination structure predecessor then thereon, on this structure priming coat arranged.Subsequently, to this stacking material layer heating, for example heating-up temperature is 80-150 ℃, and the time is 5-20 minute, and epoxy-epoxies thermosetting pressure-sensitive tape or tacky film are solidified, and simultaneously priming coat is toasted, and has obtained the noise elimination structure of underbody of the present invention.This structure also will be coated with the last layer top coat, perhaps inter coat and top coat (two-layer altogether).Inter coat and each layer of top coat for example adopt electrodeposition process to apply with melamine alkyl coating, and thickness is 20-40 μ m.After coating, inter coat and top coat generally toasted 20-30 minute down at 140-180 ℃.Therefore, the baking of the curing of heat cure pressure-sensitive tape or tacky film and priming coat can be carried out when baking inter coat or top coat.
Embodiment
Embodiment 1
(below be referred to as " ED coated board ") is coated with the thick priming paint of last layer 0.8mm on the electro-deposition coated board of 70mm * 150mm; acryloyl group-epoxy glue adhesive tape (is produced by Sumitomo 3M; commodity are called " Acryl Tape#9259 "; thickness is 1.0mm) paste; all paste on whole surface, and only isolated edge is reserved the exposed area of 15mm in the vertical.Then this cladding plate is placed temperature to be set in 140 ℃ the baking oven, reach 20 minutes, make resin solidification, be chilled to room temperature then.Obtain the sample of the stacking material of ED coated board and heat reactive resin layer thus as present embodiment.This sample is exactly the bottom girder as underbody noise elimination structure of the present invention.
Comparative example 1
With the sample of embodiment 1 described ED coated board itself as present embodiment.
Comparative example 2
Filler contains 20 weight portion Corvics and (is produced by Nippon Zeon, trade name " G121 ") for sizing mixing usefulness, 20 weight portion vinyl chloride resins (are produced by Nippon Zeon, trade name " G103ZX ") making batch mixing uses, 30 weight portion dioctyl phthalates (are produced by Shin Nihon Rika Sha company, trade name " SANSONIZER DOP " and 45 weight portion calcium carbonate are mixed into the vinyl chloride plastisol as liquid bottom coating composition with these components.Be similar to embodiment 1, be coated with this thick plastisol of last layer 1.5mm in the one side of ED coated board, only isolated edge is reserved the exposed area of 15mm in the vertical.Then this plate is placed temperature to be set in 140 ℃ the baking oven, reach 20 minutes, colloidal sol is solidified, be chilled to room temperature then.Obtain the sample of the laminated material of ED coated board and PVC priming coat thus as present embodiment.This sample is exactly the bottom girder of traditional underbody noise elimination structure.
Comparative example 3
PP resin (Honda produces, trade name " Side Garnish ", thickness 3.0mm) is cut into 70mm * 150mm size, as the present embodiment sample.This sample is the noise elimination resin bed, generally makes the bottom girder of high-grade car.
The sound level measurement method
Fig. 2 is the schematic diagram of expression sound level assay method 10.As shown in Figure 2, the exposed area 13 of the sample 11 of each embodiment is fixed on the anchor clamps 12, and and clip vertical.Place embodiment 1 sample, its thermoset resin layer is faced up; And the sample of placement comparative example 2 makes its PVC prime layer side up.Above sample 11 diagonal intersection points, place a positioning pipe 14, allow a hard ball 15 from falling from sample 50cm eminence.Place a microphone 16, make the 5cm place of this microphone top below distance hard ball 15 cracked positions, and be connected with the PC (not shown).Weight is 3/8 for the 3.5g diameter " hard ball 15 fall from the 50cm eminence, at frequency 500-8, real-time multiple scale analysis software (being provided by OnoSokki) is provided 000Hz area inner measuring sound level.
Condition determination:
Frequency: 500-8,000Hz
Record data: maximum
Wave filter: 1/3 octave component
Measuring Time: 1 second
Following table 1 with Figure 3 shows that measured result.The abscissa of Fig. 3 is measuring frequency (Hz), and ordinate is sound level (dB (A)).
Table 1
??????????????????????dB(A)
????Hz Embodiment 1 Comparative example 2 Comparative example 2 Comparative example 3
????500 ????65.23 ????79.36 ????73.45 ????73.51
????630 ????67.52 ????82.63 ????72.16 ????84.05
????800 ????73.43 ????86.90 ????90.34 ????82.46
????1000 ????80.46 ????93.89 ????93.22 ????82.92
????1250 ????80.37 ????100.51 ????96.74 ????91.10
????1600 ????83.20 ????94.66 ????93.31 ????92.54
????2000 ????82.88 ????98.86 ????91.19 ????89.59
????2500 ????85.47 ????100.68 ????99.00 ????88.57
????3150 ????91.23 ????96.11 ????94.36 ????95.43
????4000 ????89.16 ????97.10 ????93.85 ????92.56
????5000 ????89.11 ????102.02 ????91.29 ????91.91
????6300 ????82.41 ????96.31 ????83.99 ????86.45
????8000 ????78.15 ????94.16 ????87.48 ????82.21
From the result of table 1 and Fig. 3 as can be known, simulate the embodiment 1 of structure of bottom girder of the present invention, form by the stacking material that contains acryloyl group-epoxy resin.Sound level is very low under all measuring frequencies, and the result is best.Comparative example 1 is made up of monolithic ED coated board, and in being higher than the 1000Hz zone, sound level is the highest, shows that its noise elimination effect is the poorest.Traditional bottom girder that comparative example 2 simulation is made of ED coated board and PVC priming coat stacking material, sound level be in that to be higher than the 3000Hz zone lower, but in low frequency region the sound level height.Comparative example 3 is resin beds that sedan limousine uses, and it is lower that its sound level keeps generally.
Underbody noise elimination structure of the present invention can guarantee that acoustic attenuation performance more than or equal to adopting traditional resin bed, is better than the situation that directly applies priming coat on steel substrate simultaneously, and is with low cost.

Claims (4)

1. a noise elimination structure that is used for the motorcar body base plate is characterized in that: acryloyl group-epoxies heat cure layer is arranged on the coated side of the steel substrate that scribbles priming paint.
2. the noise elimination structure that is used for the motorcar body base plate as claimed in claim 1 is characterized in that: also have priming coat on described acryloyl group-epoxies heat cure layer.
3. the noise elimination structure that is used for the motorcar body base plate as claimed in claim 1 or 2 is characterized in that: the thickness of described acryloyl group-epoxies heat cure layer is 0.1mm or thicker.
4. as the described noise elimination structure that is used for the motorcar body base plate of claim 1-3, it is characterized in that: described acryloyl group-epoxies heat cure layer contains the acryloyl group component of 40-250 weight portion for per 100 weight portion epoxy component.
CNA028240634A 2001-12-04 2002-10-28 Underbody sound damping structure for motor vehicles Pending CN1599663A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP370376/2001 2001-12-04
JP2001370376A JP2003182645A (en) 2001-12-04 2001-12-04 Noise insulation structure for automotive under body portion

Publications (1)

Publication Number Publication Date
CN1599663A true CN1599663A (en) 2005-03-23

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CNA028240634A Pending CN1599663A (en) 2001-12-04 2002-10-28 Underbody sound damping structure for motor vehicles

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EP (1) EP1453670A1 (en)
JP (1) JP2003182645A (en)
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Publication number Priority date Publication date Assignee Title
CN112592142A (en) * 2020-12-30 2021-04-02 浙江创想节能科技有限公司 High-temperature-resistant sound-insulation noise-reduction coating for equipment and preparation method thereof

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GB1329723A (en) * 1970-09-08 1973-09-12 Ici Ltd Laminated sheets of metals and plastics
JPH08150685A (en) * 1993-01-20 1996-06-11 Iida Sangyo Kk Thin plate-reinforcing laminated body
DE4313762C1 (en) * 1993-04-27 1994-04-28 Ppg Ind Deutschland Gmbh Coating metal to improve stone impact resistance - by spraying primer-coated metal with a powder paint, presintering, applying a filler compsn. and stoving

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112592142A (en) * 2020-12-30 2021-04-02 浙江创想节能科技有限公司 High-temperature-resistant sound-insulation noise-reduction coating for equipment and preparation method thereof

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KR20050040861A (en) 2005-05-03
JP2003182645A (en) 2003-07-03
EP1453670A1 (en) 2004-09-08
WO2003047851A1 (en) 2003-06-12
AU2002340299A1 (en) 2003-06-17

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