JPS6333788B2 - - Google Patents
Info
- Publication number
- JPS6333788B2 JPS6333788B2 JP58222721A JP22272183A JPS6333788B2 JP S6333788 B2 JPS6333788 B2 JP S6333788B2 JP 58222721 A JP58222721 A JP 58222721A JP 22272183 A JP22272183 A JP 22272183A JP S6333788 B2 JPS6333788 B2 JP S6333788B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- vibration damping
- acid
- parts
- petroleum resin
- 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.)
- Expired
Links
- 238000013016 damping Methods 0.000 claims description 29
- 229920005989 resin Polymers 0.000 claims description 20
- 239000011347 resin Substances 0.000 claims description 20
- 239000003208 petroleum Substances 0.000 claims description 17
- 239000011256 inorganic filler Substances 0.000 claims description 14
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 14
- 239000004014 plasticizer Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- 230000000452 restraining effect Effects 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 7
- -1 polypropylene Polymers 0.000 claims description 3
- 150000008064 anhydrides Chemical class 0.000 claims description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims 2
- 229920001155 polypropylene Polymers 0.000 claims 1
- 239000010410 layer Substances 0.000 description 29
- 238000002156 mixing Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000003981 vehicle Substances 0.000 description 9
- 239000012790 adhesive layer Substances 0.000 description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 235000019198 oils Nutrition 0.000 description 4
- 239000005060 rubber Substances 0.000 description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
- 229920001083 polybutene Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000010734 process oil Substances 0.000 description 2
- 238000007127 saponification reaction Methods 0.000 description 2
- 150000003377 silicon compounds Chemical class 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- KMOUUZVZFBCRAM-OLQVQODUSA-N (3as,7ar)-3a,4,7,7a-tetrahydro-2-benzofuran-1,3-dione Chemical compound C1C=CC[C@@H]2C(=O)OC(=O)[C@@H]21 KMOUUZVZFBCRAM-OLQVQODUSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- AYKYXWQEBUNJCN-UHFFFAOYSA-N 3-methylfuran-2,5-dione Chemical compound CC1=CC(=O)OC1=O AYKYXWQEBUNJCN-UHFFFAOYSA-N 0.000 description 1
- OFNISBHGPNMTMS-UHFFFAOYSA-N 3-methylideneoxolane-2,5-dione Chemical compound C=C1CC(=O)OC1=O OFNISBHGPNMTMS-UHFFFAOYSA-N 0.000 description 1
- KNDQHSIWLOJIGP-UHFFFAOYSA-N 826-62-0 Chemical compound C1C2C3C(=O)OC(=O)C3C1C=C2 KNDQHSIWLOJIGP-UHFFFAOYSA-N 0.000 description 1
- XTJFFFGAUHQWII-UHFFFAOYSA-N Dibutyl adipate Chemical compound CCCCOC(=O)CCCCC(=O)OCCCC XTJFFFGAUHQWII-UHFFFAOYSA-N 0.000 description 1
- PYGXAGIECVVIOZ-UHFFFAOYSA-N Dibutyl decanedioate Chemical compound CCCCOC(=O)CCCCCCCCC(=O)OCCCC PYGXAGIECVVIOZ-UHFFFAOYSA-N 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 239000013032 Hydrocarbon resin Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 229920006271 aliphatic hydrocarbon resin Polymers 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 229920006272 aromatic hydrocarbon resin Polymers 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- HNEGQIOMVPPMNR-IHWYPQMZSA-N citraconic acid Chemical compound OC(=O)C(/C)=C\C(O)=O HNEGQIOMVPPMNR-IHWYPQMZSA-N 0.000 description 1
- 229940018557 citraconic acid Drugs 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 235000012343 cottonseed oil Nutrition 0.000 description 1
- 239000002385 cottonseed oil Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- JBSLOWBPDRZSMB-BQYQJAHWSA-N dibutyl (e)-but-2-enedioate Chemical compound CCCCOC(=O)\C=C\C(=O)OCCCC JBSLOWBPDRZSMB-BQYQJAHWSA-N 0.000 description 1
- VNGOYPQMJFJDLV-UHFFFAOYSA-N dimethyl benzene-1,3-dicarboxylate Chemical compound COC(=O)C1=CC=CC(C(=O)OC)=C1 VNGOYPQMJFJDLV-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229920006270 hydrocarbon resin Polymers 0.000 description 1
- 150000003949 imides Chemical class 0.000 description 1
- 239000000944 linseed oil Substances 0.000 description 1
- 235000021388 linseed oil Nutrition 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 235000014593 oils and fats Nutrition 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 150000003097 polyterpenes Chemical class 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 150000003505 terpenes Chemical class 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Landscapes
- Vibration Prevention Devices (AREA)
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
〈技術分野〉
この発明は、車両床面等、振動する金属製基体
上に貼着して振動の減衰を図る制振シートにおけ
る拘束層用配合物であつて、石油樹脂に無機フイ
ラー及び可塑剤類が配合されてなるものに関す
る。
〈背景技術〉
制振シートにおける拘束層用材料は、大きな制
振力を得るために、剛性の高いことは勿論、粘着
剤層に対する密着性が良好であることが望まれる
とともに、作業性の観点から加熱溶融時良好な流
動性を示すことが要望される。さらには、制振シ
ートは悪路走行中に飛石等により車両床面を介し
て衝撃を受けることが多く、耐衝撃性も要求され
る。なお、耐衝撃性に乏しく拘束層にクラツクが
入つたりすると制振性が大幅に減殺される。
上記諸要求を満たすために、本願出願人と同一
人に係る特許願（特願昭58−170109号、出願日：
昭和58年９月15日）において、拘束層用材料とし
て石油樹脂に無機フイラー及び可塑剤類を配合し
てなるものが提案されている。この材料で拘束層
を形成した場合、大きな制振力が得られかつ耐衝
撃性も優れているが、可塑剤類を含むも材料溶融
時の流動性が十分でなく、成形時等における作業
性が必ずしも良好とは言えなかつた。可塑剤類を
十分な流動性が得られるように多量に添加すれ
ば、上記問題点は解決するが、逆に拘束層の剛性
が、即ち制振力が大きく低下して望ましくない。
〈発明の開示〉
この発明は、上記にかんがみて、石油樹脂に無
機フイラー及び可塑剤類が配合されてなる制振シ
ートの拘束層用配合物において、制振力の低下を
ほとんど招かずに拘束層の流動性を向上させるこ
とを目的とする。
この発明の制振シートの拘束層用配合物は、こ
の目的を、石油樹脂に酸変性アタクチツクPPを
無機フイラー及び可塑剤類とともに配合すること
により達成するものである。
〈各構成の説明〉
以下の説明で配合部数「部」は、特にことわら
ない限り重量単位である。
制振シートの拘束層用配合物は、下記石油樹脂
(A)に酸変性アタクチツクPP(B)が無機フイラー(C)
及び可塑剤類(D)とともに配合されてなるものであ
る。
(A) 石油樹脂…軟化点60〜130℃の上市されてい
るものでよく、合成ポリテルペン系、脂肪族
系、芳香族系、環状脂肪族系、不飽和炭化水素
系及びそれらの水添加物等を例示できる。これ
らの石油樹脂は通常、酸価0.1以下でカルボキ
シル基等の官能基を有しない。ここで拘束層の
耐衝撃性（可撓性）の見地から芳香族系以外の
ものが望ましい。この石油樹脂は、拘束層の母
材となるが、それ自体強い粘着性を有するの
で、粘着剤層と良好に密着し、確実に拘束効果
を奏し、制振性の向上に寄与する。
(B) 酸変性アタクチツクPP…分子量ｎ＝300〜
20000（望ましくは500〜10000）のアタクチツク
PPをエチレン性不飽和カルボン酸（無水物を
含む）で変性したもの及びそれらの酸誘導体を
いう。
ここでエチレン性不飽和カルボン酸として
は、アクリル酸、メタクリル酸、マレイン酸、
フマル酸、イタコン酸、シトラコン酸、無水マ
レイン酸、イタコン酸無水物、シトラコン酸無
水物、テトラヒドロ無水フタル酸、エンドメチ
レンテトラヒドロ無水フタル酸等を例示でき
る。また、酸誘導体とは、エステル、イミド、
アミド又は金属塩をいう。エチレン性不飽和カ
ルボン酸の反応量は、反応生成物である酸変性
アタクチツクPPのケン化価が0.5〜250（望まし
くは５〜220）の範囲となるようなものとする。
この酸変性アタクチツクPPは、拘束層用材
料の流動性を少量の配合で改善させる作用を奏
し、その配合量は石油樹脂100部に対して1.5〜
35部（望ましくは２〜20部）とする。1.5部未
満では上記流動性改善効果がでず、35部を超え
ると耐衝撃性に悪影響を与える。
(C) 無機フイラー…SiO2を主体とするケイ素化
合物群及び炭酸カルシウム（重質・軽質）又は
硫酸バリウム（バライト粉・沈降性）から選ば
れる１種の又は２種以上を混合したもの。
無機フイラーの形態は、粉粒体（粉末状、フ
レーク状、顆粒状等）又は繊維いずれでもかま
わないが、前者の大きさは0.5〜500μｍ、後者
の長さは＜25mmとする。上記SiO2を主体とす
るケイ素化合物群としては、粉粒体状のクレー
（ハード・ソフト）、タルク、ミルドガラス、ガ
ラスフレーク、繊維状のガラス繊維等を挙げる
ことができ、さらに特殊なものとして嵩比重＜
0.6のシラスバルーン、ガラスバルーン、発泡
石等の無機発泡体も使用できる。この無機発泡
体を使用した場合は拘束層を軽量化できる効果
を奏する。この無機フイラーは、拘束層の剛性
を高め制振力を増大させるとともに、理由は不
明であるが、―一般に無機フイラーはポリマー
の耐衝撃性を低下させる傾向にある―、母材と
なる石油樹脂の耐衝撃性を改善する。無機フイ
ラーの配合量は、これらの効果達成及び作業性
の見地から、石油樹脂100部に対して100〜800
部とする。
(D) 可塑剤類…各種エステル系可塑剤及びプロセ
スオイルの他に、アマニ油、綿実油、大豆油、
ヒマシ油等の天然油脂、ポリブデン油、ポリブ
タジエン油、ポリペンタジエン油等のポリマ
油、液状炭化水素樹脂、液状テルペン樹脂、液
状ロジンなどの液状樹脂、及びアルキツド樹
脂、キシレン樹脂などを含む。
エステル系可塑剤としては上記石油樹脂と一
般的に相溶性が良好なジブチルフタレート、ジ
（２―エチルヘキシル）フタレート（DOP）、
ジ―ｎ―ブチルアジペート、ジメチルイソフタ
レート、ジ―ｎ―ブチルセバケート、ジ―ｎ―
ブチルヌレート、ジ―ｎ―ブチルフマレート、
ジ―ｎ―ブチルステアレート等が望ましく、ま
たプロセスオイルとしては上記石油樹脂と相溶
性の良好なパラフイン系又はナフテン系が望ま
しい。この可塑剤類は、無機フイラーの配合に
よる溶融粘度の上昇を押さえ、また、拘束層の
耐衝撃性を改善する。可塑剤類の配合量は、こ
れらの効果達成及び作業性の見地から石油樹脂
100部に対して通常３〜25部とする。
〈使用態様〉
上記構成の拘束層用配合物は、加熱して溶融混
合したものを流し塗り、刷毛塗り、ロール塗り等
の塗布手段により粘着剤層１の上面に塗布するこ
とにより拘束層２を形成し制振シートをなす（第
１図参照）。拘束層は厚い方が制振力が大きいが
車両の重量軽減の見地から、その厚みは拘束作用
を奏する範囲内でできるだけ薄い方が望ましく、
通常0.05〜10mm（望ましくは0.2〜３mm）とする。
尚、粘着剤層１は従来の粘着シートと同様にし
て形成される。即ち、各種ゴム配合物又はそれら
にアスフアルトを配合したものをニーダー等で混
練し押出し成形したものからなる。ここでゴム材
料は、NBR，IIR，EPDM，SBR等の各種ゴム
又はそれらの再生ゴムを使用できる。この粘着剤
層１の厚みは、厚くする方が制振効果が大きい
が、軽量化の見地から通常0.05〜５mmとする。
上記構成の制振シートは、第２図に示すように
車両床面３にセツト後、乾燥炉内を通して加熱処
理を行なうと、熱軟化又は流動化して車両床面に
十分なじみ、続いて冷却されると拘束層２は略剛
体化して、第２図に示すように車両床面３に貼着
される。
〈実施例〉
粘着剤層は、下記組成の配合物をニーダーで混
練後、厚さ１mmのシート状物として押出し、それ
を200mm口に裁断して形成した。
配合組成：
再生ブチルゴム 100部
粘着付与剤（芳香族系炭化水素樹脂；軟化点
100℃） 80部
炭酸カルシウム（重質） 300部
ポリブテン 50部
DOP 50部
酸変性アタクチツクPP（ポリマＡ〜Ｄ）は、ア
タクチツクPP（ｎ＝1000）100部に無水マレイ
ン酸を第１表に示す部数を加えて160℃で反応さ
せて表示のケン化価のものを得た。
拘束層は下記基準配合において、第２表に示す
ポリマＡ〜Ｅを（ ）内の表示部数配合し、200
℃で30分溶融混合して得た拘束層用材料を、粘着
剤層の上面に厚さ２mmとなるように流し塗りして
形成した。
配合組成：
脂肪族系炭化水素樹脂（軟化点95℃、酸価
0.1以下） 100部
重質炭酸カルシウム 385部
DOP 15部
ポリマ 変量
上記各制振シートを鉄板基体（0.8mmｔ）上に
セツト後、140℃×60分の条件で熱処理を行ない、
各実施例、比較例の制振力・耐衝撃性試験用の試
験片とした。
制振効果は常温雰囲気における減衰法による測
定結果から算出される損失係数ηで判定した。耐
衝撃性は上記試験片を鉄板側を上にして橋かけ支
持した状態で、鋼球（通常50ｇ）を鉄板上に落下
させ拘束層のクラツクの発生する“重さ×高さ
（ｇ・cm）”で判定した。また、拘束層の流動性
は、各実施例（比較例）の配合物30ｇを200℃で
加熱溶融したものを4.5cmの高さからアルミニウ
ム板上に落下させ、落下後の配合物の広がりを測
定し、長径と短径の平均値で表示した。試験結果
を第２表に示す。
〈発明の効果〉
この発明の制振シートは、石油樹脂、無機フイ
ラー及び可塑剤類を含有する配合物で拘束層が形
成されている制振シートにおいて、上記拘束層用
配合物中に酸変性アタクチツクPPを加えること
により、制振力の低下をほとんど招かずに拘束層
の流動性を向上させることができる。従つて、拘
束層用材料の混合・塗布作業性、さらには制振シ
ートの車両床面への貼着作業性が良好となる。
これは、上記実施例における第２表の試験結果
により裏付けられる。即ち、各実施例は、いずれ
も酸変性の代りに未変性のアタクチツクPPを用
いた比較例に比して、制振力（損失係数）の低下
をほとんど招かず、耐衝撃性及び流動性、特に流
動性が向上している。これらの理由は、極性部分
と無極性部分を有する酸変性アタクチツクPPを
拘束層用配合物中に導入することにより、有極性
の無機フイラーと無極性の石油樹脂とのなじみ
（相溶性）がよくなるためと推定される。なお、
アタクチツクPPはアイソタチツクPPの副生物で
あり、安価に入手でき経済的である。
<Technical Field> The present invention relates to a composition for a restraining layer in a vibration damping sheet that is attached to a vibrating metal substrate such as a vehicle floor surface to damp vibration, and which comprises a petroleum resin, an inorganic filler, and a plasticizer. Concerning products in which the following are combined. <Background Art> In order to obtain a large vibration damping force, the material for the restraining layer in a vibration damping sheet is desired to have not only high rigidity but also good adhesion to the adhesive layer. Therefore, it is required to exhibit good fluidity when melted by heating. Furthermore, the damping sheet is often subjected to impact from flying stones etc. through the vehicle floor surface while driving on rough roads, and is therefore required to have impact resistance. Note that if the restraint layer has poor impact resistance and cracks occur, the vibration damping performance will be significantly reduced. In order to meet the above requirements, a patent application filed by the same person as the applicant (Japanese Patent Application No. 58-170109, filing date:
(September 15, 1981) proposed a material for a constraining layer made of petroleum resin mixed with an inorganic filler and a plasticizer. When a restraining layer is formed with this material, a large vibration damping force can be obtained and it has excellent impact resistance, but even though it contains plasticizers, the material does not have sufficient fluidity when melted, making it difficult to work during molding etc. was not necessarily good. If a large amount of plasticizer is added to obtain sufficient fluidity, the above problem can be solved, but on the other hand, the rigidity of the constraining layer, that is, the vibration damping force is greatly reduced, which is not desirable. <Disclosure of the Invention> In view of the above, the present invention provides a composition for a restraining layer of a vibration damping sheet in which a petroleum resin is blended with an inorganic filler and a plasticizer, which provides restraint without causing almost any decrease in damping force. The purpose is to improve the fluidity of the layer. The composition for the restraining layer of a damping sheet of the present invention achieves this objective by blending acid-modified attic PP with a petroleum resin together with an inorganic filler and a plasticizer. <Description of each component> In the following description, the number of blended parts "parts" is a weight unit unless otherwise specified. The compound for the restraining layer of the vibration damping sheet is the following petroleum resin.
(A) is acid-modified atactic PP (B) is an inorganic filler (C)
and plasticizers (D). (A) Petroleum resin...Any commercially available one with a softening point of 60 to 130°C may be used, including synthetic polyterpene, aliphatic, aromatic, cycloaliphatic, unsaturated hydrocarbon, and water additives thereof. can be exemplified. These petroleum resins usually have an acid value of 0.1 or less and do not have functional groups such as carboxyl groups. From the viewpoint of impact resistance (flexibility) of the constraining layer, it is desirable to use a material other than aromatic. This petroleum resin serves as a base material for the constraining layer, and since it itself has strong adhesive properties, it adheres well to the adhesive layer, reliably exerts a constraining effect, and contributes to improving vibration damping properties. (B) Acid-modified atactic PP…molecular weight n=300~
20000 (preferably 500-10000) attacks
Refers to PP modified with ethylenically unsaturated carboxylic acids (including anhydrides) and their acid derivatives. Here, the ethylenically unsaturated carboxylic acids include acrylic acid, methacrylic acid, maleic acid,
Examples include fumaric acid, itaconic acid, citraconic acid, maleic anhydride, itaconic anhydride, citraconic anhydride, tetrahydrophthalic anhydride, and endomethylenetetrahydrophthalic anhydride. In addition, acid derivatives include esters, imides,
Refers to amides or metal salts. The reaction amount of the ethylenically unsaturated carboxylic acid is such that the saponification value of the acid-modified atactic PP, which is the reaction product, is in the range of 0.5 to 250 (preferably 5 to 220). This acid-modified atactic PP has the effect of improving the fluidity of the constrained layer material when mixed in a small amount, and the blending amount is 1.5 to 100 parts of petroleum resin.
35 parts (preferably 2 to 20 parts). If it is less than 1.5 parts, the above-mentioned fluidity improving effect will not be achieved, and if it exceeds 35 parts, impact resistance will be adversely affected. (C) Inorganic filler: one or a mixture of two or more selected from silicon compounds mainly composed of SiO 2 and calcium carbonate (heavy/light) or barium sulfate (barite powder/sedimentable). The form of the inorganic filler may be either powder (powder, flake, granule, etc.) or fiber, the former having a size of 0.5 to 500 μm, and the latter having a length of <25 mm. The group of silicon compounds mainly composed of SiO 2 mentioned above includes powdered clay (hard and soft), talc, milled glass, glass flakes, fibrous glass fiber, etc. Bulk specific gravity <
Inorganic foams such as 0.6 glass balloons, glass balloons, and foam stones can also be used. When this inorganic foam is used, the weight of the constraint layer can be reduced. This inorganic filler increases the rigidity of the constraining layer and increases the damping force.For reasons that are unclear, inorganic fillers generally tend to reduce the impact resistance of polymers. Improves impact resistance. From the viewpoint of achieving these effects and workability, the blending amount of inorganic filler is 100 to 800 parts per 100 parts of petroleum resin.
Department. (D) Plasticizers...In addition to various ester plasticizers and process oils, linseed oil, cottonseed oil, soybean oil,
Includes natural oils and fats such as castor oil, polymer oils such as polybutene oil, polybutadiene oil, and polypentadiene oil, liquid resins such as liquid hydrocarbon resins, liquid terpene resins, liquid rosins, alkyd resins, xylene resins, etc. Examples of ester plasticizers include dibutyl phthalate, di(2-ethylhexyl) phthalate (DOP), which generally have good compatibility with the above petroleum resins.
Di-n-butyl adipate, dimethyl isophthalate, di-n-butyl sebacate, di-n-
Butyl nurate, di-n-butyl fumarate,
Di-n-butyl stearate and the like are preferred, and the process oil is preferably paraffinic or naphthenic, which has good compatibility with the above-mentioned petroleum resins. These plasticizers suppress the increase in melt viscosity caused by blending the inorganic filler, and also improve the impact resistance of the constraining layer. From the viewpoint of achieving these effects and workability, the blending amount of plasticizers is determined by petroleum resin.
Usually 3 to 25 copies per 100 copies. <Usage mode> The constraining layer composition having the above structure is heated and melted and mixed and applied to the upper surface of the adhesive layer 1 by a coating method such as flow coating, brush coating, roll coating, etc. to form the constraining layer 2. It forms a vibration damping sheet (see Figure 1). The thicker the restraint layer, the greater the damping force, but from the perspective of reducing the weight of the vehicle, it is desirable that the thickness be as thin as possible within the range that still exerts the restraint effect.
Usually 0.05 to 10 mm (preferably 0.2 to 3 mm). Note that the adhesive layer 1 is formed in the same manner as a conventional adhesive sheet. That is, it is made by kneading various rubber compounds or blending them with asphalt using a kneader or the like and extruding the mixture. As the rubber material here, various rubbers such as NBR, IIR, EPDM, and SBR, or recycled rubber thereof can be used. The thickness of the adhesive layer 1 is usually set to 0.05 to 5 mm from the viewpoint of weight reduction, although the thicker the thickness, the greater the vibration damping effect. As shown in Fig. 2, the vibration damping sheet having the above structure is set on the vehicle floor surface 3 and then heat-treated through a drying oven, whereupon it becomes thermally softened or fluidized and fully conforms to the vehicle floor surface, and is then cooled. Then, the restraining layer 2 becomes substantially rigid and is adhered to the vehicle floor surface 3 as shown in FIG. <Example> The adhesive layer was formed by kneading a compound having the composition shown below in a kneader, extruding it into a sheet with a thickness of 1 mm, and cutting the sheet into a 200 mm opening. Blending composition: 100 parts recycled butyl rubber Tackifier (aromatic hydrocarbon resin; softening point
100℃) 80 parts calcium carbonate (heavy) 300 parts polybutene 50 parts DOP 50 parts Acid-modified atactic PP (Polymer A to D) is prepared by adding maleic anhydride to 100 parts of atactic PP (n=1000) as shown in Table 1. The parts were added and reacted at 160°C to obtain the indicated saponification value. The constraining layer is made by blending polymers A to E shown in Table 2 in the number of parts shown in parentheses in the following standard formulation, and 200
A constraining layer material obtained by melt-mixing at ℃ for 30 minutes was flow-coated onto the top surface of the adhesive layer to a thickness of 2 mm. Blending composition: Aliphatic hydrocarbon resin (softening point 95℃, acid value
0.1 or less) 100 parts heavy calcium carbonate 385 parts DOP 15 parts polymer Variables After setting each of the above vibration damping sheets on a steel plate base (0.8 mm thick), heat treatment was performed at 140°C for 60 minutes.
This was used as a test piece for vibration damping force and impact resistance tests for each of the Examples and Comparative Examples. The damping effect was judged by the loss coefficient η calculated from the measurement results by the damping method in a room temperature atmosphere. Impact resistance is measured by dropping a steel ball (usually 50 g) onto the iron plate with the above test piece supported on a bridge with the iron plate side up, and measuring the weight x height (g cm) at which cracks occur in the restraining layer. )”. In addition, the fluidity of the constrained layer was determined by heating and melting 30 g of the compound of each example (comparative example) at 200°C and dropping it onto an aluminum plate from a height of 4.5 cm, and checking the spread of the compound after falling. It was measured and expressed as the average value of the major axis and minor axis. The test results are shown in Table 2. <Effects of the Invention> The vibration damping sheet of the present invention has a restraining layer formed of a compound containing a petroleum resin, an inorganic filler, and a plasticizer. By adding atactic PP, the fluidity of the constrained layer can be improved with almost no reduction in damping force. Therefore, the workability of mixing and applying the restraining layer material and the workability of adhering the damping sheet to the vehicle floor surface are improved. This is supported by the test results in Table 2 in the above examples. That is, in each of the examples, compared to the comparative example in which unmodified atactic PP was used instead of acid-modified, the damping force (loss coefficient) hardly decreased, and the impact resistance, fluidity, In particular, liquidity has improved. These reasons are that by introducing acid-modified atactic PP, which has a polar part and a non-polar part, into the constraining layer formulation, the compatibility (compatibility) between the polar inorganic filler and the non-polar petroleum resin becomes better. It is estimated that this is due to In addition,
Atactic PP is a by-product of isotactic PP and is inexpensive and economical.
【表】【table】
第１図はこの発明の制振シートの部分断面図、
第２図はこの発明の制振シートを車両床面へ貼着
した状態を示す断面図である。
１…粘着剤層、２…拘束層、３…車両床面（金
属製基体）。
FIG. 1 is a partial sectional view of the vibration damping sheet of this invention.
FIG. 2 is a sectional view showing a state in which the vibration damping sheet of the present invention is adhered to the floor surface of a vehicle. 1...Adhesive layer, 2...Restriction layer, 3...Vehicle floor surface (metal base).
Claims (1)
されてなる制振シートの拘束層用配合物におい
て、 分子量ｎ＝300〜20000のアタクチツクポリプ
ロピレンをエチレン性不飽和カルボン酸（無水物
を含む）で変性したもの及び／又はそれらの誘導
体（以下「酸変性アタクチツクPP」という）が
1.5〜35重量部、前記石油樹脂に対して添加され
ていることを特徴とする制振シートの拘束層用配
合物。[Claims] 1. In a compound for a restraining layer of a vibration damping sheet, which is a mixture of a petroleum resin with an inorganic filler and a plasticizer, atactic polypropylene with a molecular weight of n=300 to 20,000 is mixed with an ethylenically unsaturated carboxylic acid ( (including anhydrides) and/or their derivatives (hereinafter referred to as "acid-modified atactic PP").
A composition for a restraining layer of a vibration damping sheet, characterized in that 1.5 to 35 parts by weight is added to the petroleum resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58222721A JPS60112439A (en) | 1983-11-25 | 1983-11-25 | Blend for constraint layer of vibration-damping sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58222721A JPS60112439A (en) | 1983-11-25 | 1983-11-25 | Blend for constraint layer of vibration-damping sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60112439A JPS60112439A (en) | 1985-06-18 |
| JPS6333788B2 true JPS6333788B2 (en) | 1988-07-06 |
Family
ID=16786862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58222721A Granted JPS60112439A (en) | 1983-11-25 | 1983-11-25 | Blend for constraint layer of vibration-damping sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60112439A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0465083U (en) * | 1990-10-15 | 1992-06-04 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007008417A (en) * | 2005-07-04 | 2007-01-18 | Toyota Motor Corp | Panel structure |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5776041A (en) * | 1980-10-29 | 1982-05-12 | Mitsubishi Petrochem Co Ltd | Filler-containing propylene polymer composition |
-
1983
- 1983-11-25 JP JP58222721A patent/JPS60112439A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5776041A (en) * | 1980-10-29 | 1982-05-12 | Mitsubishi Petrochem Co Ltd | Filler-containing propylene polymer composition |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0465083U (en) * | 1990-10-15 | 1992-06-04 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60112439A (en) | 1985-06-18 |
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