CN1875079A - 汽车门用密封材料 - Google Patents

汽车门用密封材料 Download PDF

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CN1875079A
CN1875079A CNA2004800326477A CN200480032647A CN1875079A CN 1875079 A CN1875079 A CN 1875079A CN A2004800326477 A CNA2004800326477 A CN A2004800326477A CN 200480032647 A CN200480032647 A CN 200480032647A CN 1875079 A CN1875079 A CN 1875079A
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automobile door
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CN100572485C (zh
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南博隆
真山义范
义本恭之
中田芳浩
长谷川清
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Honda Motor Co Ltd
Sunstar Giken KK
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    • C09J133/00—Adhesives 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; Adhesives based on derivatives of such polymers
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    • C09J135/00—Adhesives 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 a carboxyl radical, and containing at least another carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Adhesives based on derivatives of such polymers
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    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013—Fillers, pigments or reinforcing additives
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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Abstract

本发明提供一种用于将内侧隔屏粘接到汽车门内板上、尤其是为了适用于夏季而具有出色的热蠕变性能和在热状态下的剪切粘接强度的汽车门用密封材料。本发明的汽车门用密封材料由部分交联型NBR及/或SBR、增塑剂及填充材料构成。

Description

汽车门用密封材料
技术领域
本发明涉及一种汽车门用密封材料，尤其是涉及用于将内侧隔屏(日文：インサイドスクリ一ン)粘接到汽车门内板上、通过使用部分交联型的特定合成橡胶作为橡胶成分而具有特别适用于夏季的出色的热蠕变性能和在热状态下的剪切粘接强度的密封材料。
背景技术
这种汽车门用密封材料的主要目的是用于防水，例如，以往使用将增塑剂、增粘剂、填充材料、溶剂等加入丁基橡胶中后形成的含溶剂型的、在常温下成糊状的丁基橡胶类密封材料，但在夏季使用时，在高温(例如80℃)下的强度、例如热蠕变性能和在热状态下的剪切粘接强度较差，很多时候内侧隔屏(一般为聚乙烯和聚氯乙烯薄膜)会发生剥落和偏移，从而给作为主要目的的防水功能带来妨碍。
另一方面，作为无溶剂型的常温高粘度型密封材料，提出了一种将润滑剂、粘接剂、填充材料及纤维状成分加入聚丁烯树脂中后形成的材料，该密封材料具有在40℃～80℃下适于涂敷的排出性，由于其是热应用型的，因此，在80℃时能够防止流动，且具有低剥离强度，从而使维修时易于剥离回收等(参照日本专利特开2000-26836)。
发明内容
为了提供具有不比上述热应用型材料逊色的加温排出性、且可发挥出色的热状态下强度的汽车门用密封材料，本发明者们进行了专心研究，发现将部分交联型的丁腈橡胶(NBR)及/或丁苯橡胶(SBR)、增塑剂及填充材料相混合后作为橡胶成分，便能得到实现期望目的的密封材料，从而完成本发明。
即，本发明提供了一种汽车门用密封材料，其特征在于，由部分交联型NBR及/或SBR、增塑剂及填充材料构成，用于将内侧隔屏粘接到汽车门的内板上。
本发明中的上述部分交联型NBR及SBR分别是利用二乙烯基苯或硫磺等交联剂对NBR及SBR部分地进行加热交联而得到的，可以从日本合成ゴム(株)、日本ゼオン(株)等公司购买。
又，除了这种部分交联型的合成橡胶外，也可使用未交联型的合成橡胶，例如，丙烯腈-异戊二烯橡胶(NIR)、NBR、SBR、聚丁橡胶、异戊二烯橡胶等完全未交联的合成橡胶，尤其是孟纳粘度(JIS K-6300)为30～50的合成橡胶最好。
本发明中的上述增塑剂用于膨润溶解上述部分交联型的合成橡胶，具体来说，列举有：邻苯二甲酸脂和石油类分馏精制物、例如DOP、DBP、DIDP、BBP、DINP、DHP、高级邻苯二甲酸乙醇酯等。
本发明中的上述填充材料用于调整流动特性和物性，例如，列举有：重质碳酸钙、表面处理碳酸钙、粘土、滑石、硅粉、纤维素粉、树脂粉末、金属粉末、玻璃微球、塑料微球、纤维状填料、针状填料等。
本发明的汽车门用密封材料中，上述部分交联型NBR及/或SBR、增塑剂及填充材料为必要成分，除此之外，最好是加入上述未交联型的合成橡胶(尤其是未交联型NBR)，并根据需要适量地加入普通的添加剂、例如颜料、粘附剂、防老化剂、交联剂等。
在此，部分交联型合成橡胶的总含量一般可选在5～45％(重量％，以下相同)之间，最好是选在5～25％的范围内。不满5％就得不到足够的热蠕变性能，而如果超过45％的话，则排出性、操作性便有恶化的倾向。
具体实施方式
下面举出实施例和比较例，对本发明作更具体的说明。
实施例1
用混料用滚压机对5.5份(重量份，以下相同)的部分交联型NBR(日本合成ゴム(株)制造的“DN214”)及5.5份的部分交联型SBR(本ゼオン(株)制造的“ニポ一ル1009”)进行压片后，将这些合成橡胶利用强力拌和机混合溶解到DINP(33份)中，接着加入重质碳酸钙36份及表面处理碳酸钙20份，利用拌和机使它们分散均匀，从而得到汽车门用密封材料100份。
比较例1
使用含溶剂型的、在常温下成糊状的丁基橡胶类密封材料。
性能试验
对实施例1或比较例1的密封材料进行下述性能试验。
(1)SOD粘度
在密封材料的初始状态下，或者经过50℃×5天或80℃×5天的存储后，利用SOD粘度计对各种剪切速度(sec-1)及测定温度下的SOD粘度(Pa·s)进行测定。结果如下述表1所示。
表1                                                  单位：Pa·s
                 剪切速度(sec-1)
  10   20   78   200   430
  实施例1 初期 测定温度   20℃   -   696   294   -   133
  60℃   645   411   155   91   51
  80℃   560   350   134   73   46
  50℃×5天后   60℃   739   459   184   103   61
80℃×5天后 60℃ 872 510 199 112 63
比较例1 初期 20℃ 525 421 289 226 S.O.
  30℃   335   246   156   124   104
  40℃   283   204   134   103   84
注)S.O.：超出数值范围
(2)剪切粘接强度
对涂漆钢板的周围边缘以コ字形涂敷上密封材料(在实施例1中，在60℃下进行热应用)，并在上面贴上聚酯膜，在经过20℃、65％RH×2小时的养生后，在各种测定温度下对剪切粘接强度(N/6.25cm2)进行测定。结果如下述表2所示。
表2：
  测定温度   实施例1   比较例1
  20℃60℃80℃   4.19CF3.11CF2.86CF   2.15CF0.58CF0.50CF
注)CF：密封材料的粘接破坏
(3)热蠕变试验
对电泳涂漆钢板以100mm宽×100mm长×5mm厚的条状(日文：ビ一ド状)涂敷密封材料(在实施例1中，在60℃下进行热应用)。在该条状的密封材料上，以正好露出40mm长度的状态贴上20mm宽×150mm长的聚乙烯膜，在经过20℃、65％RH×2小时的养生后，在膜的露出端施加0.5g或1.0g的载荷，接着，为使该载荷在上方，使试验体垂直竖立(由此，因载荷的自重使膜端弯曲)，并将其保持在80℃的热风恒温器中，观察在3小时或24小时后膜有无剥落和偏移。结果如下述表3所示。
表3：
  载荷   80℃下的时间   实施例1   比较例1
  0.5g0.5g1.0g1.0g   3小时24小时3小时24小时   无变化无变化CF、0.5～1.0mmCF、0.5～1.0mm   AF、60mm＜AF、60mm＜AF、60mm＜AF、60mm＜
注)AF：膜与密封材料间的界面破坏，CF：密封材料的粘接破坏，mm表示剥落长度。

Claims (2)

1、一种汽车门用密封材料，其特征在于，由部分交联型的丁腈橡胶(NBR)及/或丁苯橡胶(SBR)、增塑剂及填充材料构成，用于将内侧隔屏粘接到汽车门的内板上。
2、如权利要求1所述的汽车门用密封材料，其特征在于，部分交联型NBR及/或SBR的总含量为5～45重量％。
CNB2004800326477A 2004-06-18 2004-06-18 汽车门用密封材料 Expired - Lifetime CN100572485C (zh)

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