CS239381B1 - Viscious-elastic material for dumping vibracion level and noice - Google Patents
Viscious-elastic material for dumping vibracion level and noice Download PDFInfo
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- CS239381B1 CS239381B1 CS842970A CS297084A CS239381B1 CS 239381 B1 CS239381 B1 CS 239381B1 CS 842970 A CS842970 A CS 842970A CS 297084 A CS297084 A CS 297084A CS 239381 B1 CS239381 B1 CS 239381B1
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- 239000013013 elastic material Substances 0.000 title description 2
- 238000013016 damping Methods 0.000 claims abstract description 13
- 239000006185 dispersion Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000010439 graphite Substances 0.000 claims abstract description 7
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 7
- 229920002689 polyvinyl acetate Polymers 0.000 claims abstract description 5
- 239000011118 polyvinyl acetate Substances 0.000 claims abstract description 5
- 239000000945 filler Substances 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 9
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 6
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000460 chlorine Substances 0.000 claims description 6
- 229910052801 chlorine Inorganic materials 0.000 claims description 6
- 239000012188 paraffin wax Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000005725 8-Hydroxyquinoline Substances 0.000 claims description 5
- 229960003540 oxyquinoline Drugs 0.000 claims description 5
- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 239000010425 asbestos Substances 0.000 claims description 4
- 229910052895 riebeckite Inorganic materials 0.000 claims description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 3
- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 claims description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- 239000001263 FEMA 3042 Substances 0.000 claims description 2
- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000007334 copolymerization reaction Methods 0.000 claims description 2
- 239000000839 emulsion Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 claims description 2
- 229940033123 tannic acid Drugs 0.000 claims description 2
- 235000015523 tannic acid Nutrition 0.000 claims description 2
- 229920002258 tannic acid Polymers 0.000 claims description 2
- 239000011345 viscous material Substances 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims 1
- 239000003999 initiator Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 230000000379 polymerizing effect Effects 0.000 claims 1
- 229920002451 polyvinyl alcohol Polymers 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 7
- 239000000654 additive Substances 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract description 3
- 238000004378 air conditioning Methods 0.000 abstract description 2
- 230000003110 anti-inflammatory effect Effects 0.000 abstract 1
- 238000009413 insulation Methods 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 239000008240 homogeneous mixture Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229920001864 tannin Polymers 0.000 description 2
- 239000001648 tannin Substances 0.000 description 2
- 235000018553 tannin Nutrition 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 239000010428 baryte Substances 0.000 description 1
- 229910052601 baryte Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- -1 chalk Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000010454 slate Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
Abstract
Vynález rieši zloženie izolácie, určenej pre tlmenie úrovně vibrácií a hluku na kovových konštrukciách dopravných prostriedkov. Izolačná zmes sa připravuje z polyvinylacetáto-vej disperzie, krystalického grafitu, antikorozívnych a protihorfavostných přísad, resp inertných plniv podl’a stanovených pomerov. Aplikuje sa v hrůbkách 1,2 až l,5násobok hrůbky kovového podkladu. Může sa používat v teplotnom intervale od —40 do +150 °C, pričom najvyššie hodnoty koeficientu vnútorného tlmenia dosahuje v oblastiach od +30 do +60 °C. Může sa využívat na tlmenie vibrácie a hluku v dopravných prostriedkoch, vzduchotechnických zariadeniach a podThe invention solves the composition of the insulation intended to dampen the level of vibration and noise on metal means of transport. The insulating mixture is prepared from polyvinyl acetate dispersions, crystalline graphite, anti-corrosive and anti-inflammatory additives or inert fillers as specified conditions. It is applied in ridges 1,2 up to 1.5 times the ridge of the metal substrate. It can be used in the temperature range from -40 to +150 ° C, with the highest values the coefficient of internal damping reaches v from +30 to +60 ° C. Can be used to dampen vibration and noise in traffic means, air conditioning and so on
Description
Predmetom vynálezu je vazkopružný materiál na báze disperzného, spojiva, grafitu a iných přísad na tlmenie ohybových vibrácií kovových konštrukcií. Je to, prvok pasívnej vibroizolácie, ktorý zvyšuje konstrukčně tlmenie dynamicky namáhaných súčiastok. V spojení s nosnou kovovou vrstvou vznikne sústava s výbornými disipatývnymi vlastnosťami.It is an object of the present invention to provide a viscous-elastic material based on dispersion, binder, graphite and other additives to dampen the bending vibrations of metal structures. It is an element of passive vibroinsulation that increases the structural damping of dynamically stressed components. In connection with the supporting metal layer, a system with excellent dissipatty properties is created.
Problematika hluku a vibrácií v technickej praxi (dopravné prostriedky, autá, lodě, vzduchotechnické zariadenia, atd'.) sa stala velmi závažnou otázkou, čo súvisí s trendom sústavného sprísňovania hygienických predpisov stanovujúcich maximálně dovolené úrovně hluku a vibrácií. Jedným z progresívnych sposobov zníženia úrovně hluku je obloženie kovověj konštrukcie ma· teriálmi s vysokým koeficientom vnútornéto tlmenia — vytvorenie tzv. vrstvených konštrukcií.The issue of noise and vibration in technical practice (vehicles, cars, ships, air-conditioning equipment, etc.) has become a very serious issue, which is related to the trend of continuous tightening of hygiene regulations setting maximum permissible noise and vibration levels. One of the progressive ways of reducing the noise level is the lining of the metal structure with materials with a high coefficient of internal damping. laminated structures.
Hlavnými požiadavkami na tlmiace vázkopružné materiály s účelom použitia v technickej praxi sú: vysoká hodnota koeficientu vnútorného tlmenia vo všetkých oblastiach prevádzkových teplot a v širo,kom frekvenčnom rozsahu, dokonalá adhézia ku kovovému podkladu, objemová stálost' pri daných prevádzkových podmienkach, dlhodotoá a spolahlivá protikorózna ochrana, možnost nanášania progresívnymi metodami. Známe sposoby vytvárania vibroizolačných materiálov vychádzajú zo zmesi, ktoré sa skladajú z organických spojiv, ako sú akrylátové a vinylacetátové disperzie, polyuretánové a polyesterové živice, PVC, guma. Obsahujú anorganické plnívá ako sú baryt, azbest, vápenec, brydlica, krieda, sadze, cement, sfuda a ďalšie přísady.The main requirements for damping viscous materials for use in technical practice are: high value of internal damping coefficient in all areas of operating temperatures and in wide, wide frequency range, perfect adhesion to metal substrate, volume stability under given operating conditions, long-term and reliable corrosion protection , possibility of application by progressive methods. Known methods for forming vibro-insulating materials are based on mixtures consisting of organic binders such as acrylate and vinyl acetate dispersions, polyurethane and polyester resins, PVC, rubber. They contain inorganic fillers such as barite, asbestos, limestone, slate, chalk, soot, cement, sparse and other additives.
Kombináciou uvedených materiálov sú vytvárané také zmesi, ktoré majú okrem požadovaných výsledných vlastností aj vhodné technologické vlastnosti potřebné pri konkrétnej aplikácii. Nevýhody známých vibroizolačných materiálov je možné zhrnúť následovně: vyznačujú sa poměrně nízkou hodnotou koeficientu vnútorného tlmenia, koeficient vnútorného tlmenia je velmi závislý od teploty. Maximálna hodnota u známých riešení je okolo 20 °C a pri vyšších teplotách rapidně klesá. Z hladiska hořlavosti, tepelnej a koróznej odolnosti sú na nízkej úrovni. Technológia vytvárania antivibračných izolácií je zložitá, a vyžaduje velmi přísné dodržanie technologických podmienok.By combining the above materials, mixtures are formed which have, in addition to the desired final properties, also suitable technological properties required for a particular application. The disadvantages of known vibroinsulating materials can be summarized as follows: they are characterized by a relatively low value of the internal damping coefficient, the internal damping coefficient being very temperature dependent. The maximum value of known solutions is about 20 ° C and drops rapidly at higher temperatures. They are low in terms of flammability, heat and corrosion resistance. The technology of creating antivibration isolations is complex and requires very strict observance of technological conditions.
Vyššie uvedené nedostatky sú odstraněné podta vynálezu, ktorého podstatou je zloženie vibroizolačného materiálu na báze disperzného organického spojiva, grafitu ako plniva, 8-hydroxychinolínu alebo tanínu ako antikoróznej přísady, oxidu antimonitého alebo hlinitého a chlórovaného parafínu s obsahom chlóru 40—70 % ako protihorlavostných přísad. Podlá tohto vynálezu vibroizolačný materiál sa připravuje zmiešaním a homogenizáciou týchto komponentov v stanovených pomeroch: akrylátová disperzi,a vyrobená emulznou kopolymerizáciou styrénu, etylhexylakrylátu a kyseliny akrylovej alebo polyvinylacetátu strednodisperzného vyrobeného polymerizáciou vinylacetátu vo vodnej emulzií za použitia ochranného koloidu polyvinylalkoholu a iniciátora, kryštalický grafit o zrnitosti 75—90 μπι, 8-hydroxychinolín alebo kyselina trieslová, oxid antimonitý alebo hlinitý, chlórovaný parafín s obsahom chlóru 40—70 % hmotnostných, vodný roztok hydroxidu sodného, azbest krátkovláknitý, resp. iné inertně a nehořlavé plnivo, voda.The above-mentioned drawbacks are eliminated according to the invention, which is based on the composition of vibro-insulating material based on disperse organic binder, graphite as filler, 8-hydroxyquinoline or tannin as anticorrosive additive, antimony or aluminum oxide and chlorinated paraffin with chlorine content 40-70% as flame retardant. . According to the present invention, the vibro-insulating material is prepared by mixing and homogenizing the following components in specified ratios: acrylate dispersion, and produced by emulsion copolymerization of styrene, ethylhexyl acrylate and acrylic acid or polyvinyl acetate medium dispersed by polymerization of vinyl acetate in water 75-90 μπι, 8-hydroxyquinoline or tannic acid, antimony trioxide or alumina, chlorinated paraffin with a chlorine content of 40-70% by weight, aqueous sodium hydroxide solution, asbestos, short-fiber, resp. other inert and non-flammable filler, water.
Výhody izolačnej zmesi podlá vynálezu v porovnaní so známými riešeniami sú: vysoká hodnota koeficientu vnútorného tlmenia predovšetkým v oblastiach od 40—60 °C. Maximálnu hodnotu koeficientu tlmenia (0,3) dosiahne pri t = 50 °C. Koeficient tlmenia vykazuje typické vlastnosti lineárneho tlmenia. Materiál má dobré odhézne vlastnosti, dané spojivom, ktoré zabezpečuje přilnavost cca 1,5 MPa k základnému materiálu. Má dohrú objemovú stálost v rozmedzí teplot —40 až +150 °C. Antiko,rózna účinnost 1 mm vrstvy vibroizolačného materiálu bez základného nátěru na oceli je vyššia ako 3 roky. Nanášanie vibroizolačného materiálu je preveditelné štetcom, špachtlou, pneumatickým striekaním alebo šnekovým vytlačováním a nasledovnýin rozstrekom v rozmedzí +5 až +35 °C. Reálna časť komplexného modulu pružnosti v ohybu materiálu klesá s teplotou mierne.The advantages of the insulating composition according to the invention compared to the known solutions are: a high value of the internal damping coefficient, especially in the range of 40-60 ° C. It reaches the maximum value of the damping coefficient (0,3) at t = 50 ° C. The damping coefficient exhibits typical linear damping properties. The material has good casting properties given by the binder, which ensures adhesion of about 1.5 MPa to the base material. It has a volume stability in the temperature range of -40 to +150 ° C. The anticorrosive effect of a 1 mm thick layer of vibro-insulating material without primer on steel is higher than 3 years. The application of the vibro-insulating material can be accomplished by brush, spatula, pneumatic spraying or screw extrusion and subsequent spraying in the range of +5 to +35 ° C. The real part of the complex flexural modulus decreases slightly with temperature.
Příklad 1Example 1
Do 45 hmotnostných dielov polyvinylacetátovej disperzie sa pridajú 2 hmotnostně diely 10 % roztoku hydroxidu sodného, 9 hmotnostných dielov chlórovaného parafínu s obsahom chlóru 40 %, 0,3 hmotnostných dielov 8-hydroxychinolínu, 8 hmotnostných dielov oxidu hlinitého a 40 hmotnostných dielov grafitu. Zmieša sa s přidáním 4 hmotnostných dielov vody na homogénnu zmes.To 45 parts by weight of the polyvinyl acetate dispersion were added 2 parts by weight of 10% sodium hydroxide solution, 9 parts by weight of chlorinated paraffin containing 40% chlorine, 0.3 parts by weight of 8-hydroxyquinoline, 8 parts by weight of alumina and 40 parts by weight of graphite. It is mixed with the addition of 4 parts by weight of water to a homogeneous mixture.
P r í k 1 a d 2Example 1 a d 2
Do 55 hmotnostných dielov akrylátovej disperzie sa pridajú 3 hmotnostně diely 10 pere. roztoku hydroxidu sodného, 6 hmotnostných dielov chlórovaného, parafínu s obsahom chlóru 70 %, 0,2 hmotnostně diely 8-hydroxychinolínu, 7 hmotnostných dielov oxidu antimonitého a 35 hmotnostných dielov grafitu. Zmieša sa s přidáním 2 hmotnostných dielov vody na homogénnu zmes.To 55 parts by weight of the acrylate dispersion are added 3 parts by weight of 10 pens. sodium hydroxide solution, 6 parts by weight of chlorinated paraffin with a chlorine content of 70%, 0.2 parts by weight of 8-hydroxyquinoline, 7 parts by weight of antimony trioxide and 35 parts by weight of graphite. Mix with 2 parts by weight of water per homogeneous mixture.
Příklad 3Example 3
Do 50 hmotnostných dielov polyvinylacetátovej disperzie sa pridajú 2,4 hmotnostně diely 10 % roztoku hydroxidu sodného, 0,22To 50 parts by weight of polyvinyl acetate dispersion were added 2.4 parts by weight of 10% sodium hydroxide, 0.22
39 3 5 hmotnostných dielov tanínu, 7,3 hmotnostných dielov oxidu hlinitého, 7,3 hmotnostných dielov chlórovaného parafínu s obsahom chlóru 40 %, 36 hmotnostných dielov grafitu, 12 hmotnostných dielov krátkovláknitého azbestu a 5 hmotnostných dielov cementu. Zmieša sa s přidáním 9 hmotnostných dielův vody na homogénnu zmes.39 parts by weight of tannin, 7.3 parts by weight of alumina, 7.3 parts by weight of chlorinated paraffin with a chlorine content of 40%, 36 parts by weight of graphite, 12 parts by weight of short-fiber asbestos and 5 parts by weight of cement. It is mixed with the addition of 9 parts by weight of water to a homogeneous mixture.
Po nanášaní a vyschnutí trvajúcom 1 až 2 dni sa vytvoří vo všetkých týchto- príkladoch na kovovom podklade vazkopružnýAfter application and drying for 1 to 2 days, a viscous elastic is formed on the metal substrate in all these examples.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS842970A CS239381B1 (en) | 1984-04-19 | 1984-04-19 | Viscious-elastic material for dumping vibracion level and noice |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS842970A CS239381B1 (en) | 1984-04-19 | 1984-04-19 | Viscious-elastic material for dumping vibracion level and noice |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CS297084A1 CS297084A1 (en) | 1985-05-15 |
| CS239381B1 true CS239381B1 (en) | 1986-01-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS842970A CS239381B1 (en) | 1984-04-19 | 1984-04-19 | Viscious-elastic material for dumping vibracion level and noice |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS239381B1 (en) |
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1984
- 1984-04-19 CS CS842970A patent/CS239381B1/en unknown
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| Publication number | Publication date |
|---|---|
| CS297084A1 (en) | 1985-05-15 |
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