CN103814079A - 聚对苯二甲酸丁二醇酯树脂组合物和熔接体 - Google Patents

聚对苯二甲酸丁二醇酯树脂组合物和熔接体 Download PDF

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Publication number
CN103814079A
CN103814079A CN201280044921.7A CN201280044921A CN103814079A CN 103814079 A CN103814079 A CN 103814079A CN 201280044921 A CN201280044921 A CN 201280044921A CN 103814079 A CN103814079 A CN 103814079A
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Prior art keywords
polybutylene terephthalate
terephthalate resin
welding
products formed
resin combination
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坂田耕一
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WinTech Polymer Ltd
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WinTech Polymer Ltd
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Abstract

本发明提供一种树脂组合物，其为流动性优异的聚对苯二甲酸丁二醇酯树脂组合物，且可提高将由上述聚对苯二甲酸丁二醇酯树脂组合物成型而成的成型品彼此熔接而成的熔接体的熔接强度和耐热冲击性。[解决手段]制作一种聚对苯二甲酸丁二醇酯树脂组合物，其包含重均分子量为60000以上且80000以下的聚对苯二甲酸丁二醇酯树脂（A）和无机填充材料（B）。优选的是，相对于100质量份（A）聚对苯二甲酸丁二醇酯树脂，包含5～20质量份弹性体（C）。

Description

聚对苯二甲酸丁二醇酯树脂组合物和熔接体
技术领域
本发明涉及聚对苯二甲酸丁二醇酯树脂组合物，涉及成型性优异，制成成型品并将多个成型品彼此熔接时，显示高熔接强度和耐热冲击性的树脂组合物、以及将由该树脂组合物构成的成型品熔接而成的熔接体。
背景技术
聚对苯二甲酸丁二醇酯树脂的机械性质、电性质、其它物理性质、化学性质优异，且加工性良好，故作为工程塑料而用于汽车部件、电气/电子部件等广泛的用途。
上述用途中，有容纳搭载有电子部件的基板等的壳体的用途，该壳体是由盖和主体接合而成的。这样的壳体用于保护位于内部的基板等部件免受来自外部的水分、粉尘、冲击的影响，所以要求盖和主体充分地密合。
作为可提高盖和主体的接合强度、且简便的接合方法，已知有振动熔接法、超声波熔接法等熔接法。上述熔接法在上述那样的壳体的盖和主体的接合中优选地被采用，而且不仅限于聚对苯二甲酸丁二醇酯树脂，在由其它的树脂构成的成型品彼此的接合中也优选地被采用。
例如，专利文献1中公开了使用振动熔接法将热塑性树脂组合物制的灯壳（lamp housing）与聚甲基丙烯酸甲酯树脂制、聚碳酸酯树脂制的汽车的灯玻璃（lens）进行接合来制造汽车用灯的技术。使用这样的熔接法将成型品彼此进行接合的技术是已知的，但在实际的产品开发中还必须考虑到熔接体的机械强度。在专利文献1中，构成上述灯壳的原料为具有将甲基丙烯酸甲酯单体与丙烯酸乙酯单体进行聚合而得到的橡胶状接枝共聚物、聚碳酸酯树脂、聚对苯二甲酸烷二醇酯树脂的树脂组合物。该树脂组合物的刚性低、载荷挠曲温度等耐热性差。所以，即使使用专利文献1中记载的技术制造容纳基板等的壳体，也会产生机械强度等问题，因此得不到具有所期望性能的壳体。另外，专利文献1中作为振动熔接性只公开了外观性（熔接余量），而没有关于熔接强度的启示。
另外，专利文献2中公开了用于制造振动熔接的成型品的聚对苯二甲酸丁二醇酯树脂组合物。专利文献2中记载的树脂组合物中包含含有5～30摩尔%共聚单体的改性聚酯共聚物，但在使用该改性聚酯共聚物时，成型品的耐热性降低，所以即使利用专利文献2中记载的技术来制造容纳基板等的壳体，也得不到具有所期望性能的壳体。
另外，专利文献3中公开了用于制造振动熔接的成型品的聚酰胺树脂组合物。专利文献3中记载了，为了提高成型品彼此的熔接强度，可以提高树脂组合物熔融时的粘度。
现有技术文献
专利文献
专利文献1：日本特开2000-302824号公报
专利文献2：日本特开2006-176691号公报
专利文献3：日本特开2009-97011号公报
发明内容
发明要解决的问题
如上所述，专利文献3中记载了，若提高构成熔接的成型品的树脂组合物熔融时的粘度，则熔接强度会提高，但上述粘度高意味着制造成型品时的树脂组合物的流动性降低。
此处，若成型时的树脂组合物的流动性不足，则可成型的成型品的形状有限。尤其在为了赋予实际的产品所需的机械强度等而添加无机填充材料时，流动性容易变得更低。因此，需要在熔融时具有一定水平以上的流动性且熔接强度提高的技术。
用于解决问题的方案
本发明人等针对将由聚对苯二甲酸丁二醇酯树脂组合物构成的成型品熔接而成的熔接体，为了解决上述问题而反复进行了深入研究。此时，关于聚对苯二甲酸丁二醇酯树脂组合物，发现即使提高熔融时的树脂组合物的粘度，有时熔接强度也没有提高，进而发现，在聚对苯二甲酸丁二醇酯树脂组合物的情况下，树脂组合物中所含的聚对苯二甲酸丁二醇酯树脂的分子量与熔接强度之间存在关系，进而，若将上述分子量调整为特定的范围，则能够提高构成熔接体的成型品间的熔接强度，并且能够将构成成型品的树脂组合物的流动性调整为一定水平以上，从而完成了本发明。更具体而言，本发明提供以下的技术方案。
（1）一种聚对苯二甲酸丁二醇酯树脂组合物，其包含重均分子量为60000以上且80000以下的聚对苯二甲酸丁二醇酯树脂（A）和无机填充材料（B）。
（2）根据（1）所述的聚对苯二甲酸丁二醇酯树脂组合物，其中，相对于100质量份聚对苯二甲酸丁二醇酯树脂（A），包含5～20质量份弹性体（C）。
（3）一种熔接体，其是将由（1）或（2）所述的聚对苯二甲酸丁二醇酯树脂组合物构成的成型品彼此熔接而成的。
（4）根据（3）所述的熔接体，其是将前述成型品彼此抵接、在抵接面产生摩擦热而熔接而成的。
发明的效果
本发明的树脂组合物的流动性优异，且将由本发明的树脂组合物构成的成型品彼此熔接而成的熔接体的成型品间的熔接强度强。
将本发明的树脂组合物成型而成的成型品有效利用作为原料的树脂组合物的高流动性、制成熔接品时的成型品间的较强的熔接强度、聚对苯二甲酸丁二醇酯树脂所具有的优异的物性，可以优选地用作容纳电子部件的壳体、罩、外壳用的成型品。
附图说明
图1为示意性地示出振动熔接的2个成型品的截面的图，图1的（a）为表示整体的图，图1的（b）为图1的（a）中的用虚线包围的部分A的放大图。
图2为示意性地示出超声波熔接的2个成型品的截面的图，图2的（a）为表示整体的图，图2的（b）为图2的（a）中的用虚线包围的部分C的放大图。
具体实施方式
以下，依次对本发明的聚对苯二甲酸丁二醇酯树脂组合物的构成成分进行详细说明。
＜聚对苯二甲酸丁二醇酯树脂（A）＞
首先，作为本发明的树脂组合物的基础树脂的聚对苯二甲酸丁二醇酯树脂（A）是指将对苯二甲酸与包含碳数4的亚烷基二醇（1,4-丁二醇）或其成酯性衍生物的二醇成分缩聚而得到的聚对苯二甲酸丁二醇酯树脂。
本发明中，聚对苯二甲酸丁二醇酯树脂为由来自对苯二甲酸的重复单元与来自1,4-丁二醇的重复单元构成的未改性聚对苯二甲酸丁二醇酯树脂。
为了提高熔接的成型品间的熔接强度，有时也使用包含来自对苯二甲酸、1,4-丁二醇以外的其它单体的重复单元的、所谓的改性聚对苯二甲酸丁二醇酯树脂，根据本发明，即使使用未改性的聚对苯二甲酸丁二醇酯树脂也可以提高成型品间的熔接强度，所以从耐热性的观点来看，优选使用未改性的聚对苯二甲酸丁二醇酯树脂。
聚对苯二甲酸丁二醇酯树脂（A）的重均分子量为60000以上且80000以下。重均分子量不足60000时，尽管成型时的流动性优异，但熔接的成型品间的熔接强度不会提高。另外，重均分子量超过80000时，粘度显著增高，因此得不到通过注射成型来制造成型品所必需的流动性。从熔接强度和流动性的观点来看，聚对苯二甲酸丁二醇酯树脂（A）的重均分子量更优选为65000以上且75000以下、进一步优选为65000以上且70000以下。
另外，若聚对苯二甲酸丁二醇酯树脂（A）的重均分子量处于上述范围，则聚对苯二甲酸丁二醇酯树脂（A）的耐热性也变高。此处耐热性是指通过DSC（差示扫描量热计）在升温速度10℃/min、降温速度-10℃/min下测定的结晶温度（Tc），上述结晶温度优选为190℃以上。另外，若聚对苯二甲酸丁二醇酯树脂（A）的重均分子量处于上述范围，则由树脂组合物构成的熔接体的耐热冲击性良好。
需要说明的是，通过将具有不同重均分子量的聚对苯二甲酸丁二醇酯树脂共混，也可以调整重均分子量。例如，通过将重均分子量50000的聚对苯二甲酸丁二醇酯树脂与重均分子量100000的聚对苯二甲酸丁二醇酯树脂共混，可以制备重均分子量70000的聚对苯二甲酸丁二醇酯树脂。
＜无机填充剂（B）＞
作为本发明中使用的无机填充剂（B），公知的玻璃纤维均可优选地使用。而且，对玻璃纤维的玻璃纤维直径、圆筒、茧形、椭圆截面等形状、或者用于短切原丝、粗纱等的制造时的长度、玻璃切割的方法没有特别的限定。本发明中，对玻璃的种类也没有限定，在品质方面，优选使用E玻璃、组成中具有锆元素的耐腐蚀玻璃。
另外，本发明中，为了提高玻璃纤维与树脂基质的界面特性，优选使用利用氨基硅烷化合物、环氧化合物等有机处理剂进行了表面处理的玻璃纤维。其中，特别优选使用以加热失重值表示的有机处理剂量为1质量%以上的玻璃纤维。作为所述玻璃纤维所使用的氨基硅烷化合物、环氧化合物，公知的物质均可优选地使用，本发明中对玻璃纤维的表面处理中使用的氨基硅烷化合物、环氧化合物的种类没有特别的限定。
另外，作为本发明中使用的无机填充剂，例如可列举出玻璃微珠、玻璃鳞片、二氧化硅、高岭土、滑石、粘土、硅灰石、氧化钛、氧化锌、氧化铝、碳酸钙、碳酸镁等非纤维状填充剂。单独使用这些无机填充剂时，不能得到具有充分强度的成型体，所以理想的是将这些无机填充剂与纤维状填充剂组合使用。另外，根据需要，也可以利用表面处理剂等对这些无机填充剂进行处理。
这些无机填充剂（B）的添加量优选在赋予实际的产品所需的机械强度等且不损害成型所需的流动性的范围内适当选择。
＜弹性体（C）＞
在应用超声波熔接、振动熔接工艺等的用途中，有时将连接器等的金属端子、各种传感器部件等与成型品一体化。尤其在搭载于汽车的部件用途中，往往需要在高温/高湿环境、冷热循环环境中的高度的耐久性，所以也可以添加用于改善冷热循环寿命的弹性体。
作为弹性体（C），热塑性弹性体、核壳弹性体等是有用的，作为热塑性弹性体，可列举出烯烃系、苯乙烯系、聚酯系的弹性体。
作为烯烃系弹性体，优选的是以乙烯和/或丙烯为主要成分的共聚物，可以适宜地利用（a-1）乙烯-不饱和羧酸烷基酯共聚物或（a-2）由α-烯烃与α,β-不饱和酸的缩水甘油酯构成的烯烃系共聚物与（b）主要由下述通式（1）所示的重复单元构成的聚合物或共聚物中的一种或二种以上以支链或交联结构化学键合而成的接枝共聚物。
Figure BDA0000477138560000061
（式（3）中，R表示氢原子或低级烷基（例如，C1～C6的烷基），X表示选自由-COOCH3、-COOC2H5、-COOC4H9、-COOCH2CH（C2H5）C4H9、苯基和氰基组成的组中的一种以上的基团。）
所述接枝共聚物尤其在热冲击性的改善方面有效。作为（a-1）乙烯-不饱和羧酸烷基酯共聚物的具体例子，可列举出乙烯-丙烯酸共聚物、乙烯-甲基丙烯酸共聚物、乙烯-丙烯酸-丙烯酸乙酯共聚物、乙烯-丙烯酸乙酯共聚物、乙烯-醋酸乙烯酯共聚物、乙烯-醋酸乙烯酯-丙烯酸乙酯共聚物等无规共聚物，进而还可以将这些共聚物混合使用。
另外，关于作为构成（a-2）的烯烃系共聚物的一种单体的α-烯烃，可列举出乙烯、丙烯、1-丁烯等，优选使用乙烯。此外，作为构成（a-2）成分的另一种单体的α,β-不饱和酸的缩水甘油酯是指下述通式（2）所示的化合物，例如可列举出丙烯酸缩水甘油酯、甲基丙烯酸缩水甘油酯、乙基丙烯酸缩水甘油酯等，特别优选使用甲基丙烯酸缩水甘油酯。
Figure BDA0000477138560000071
（式（4）中，R1表示氢原子、或低级烷基（例如，C1～C6的烷基）。）
α-烯烃（例如乙烯）与α,β-不饱和酸的缩水甘油酯通过利用通常周知的自由基聚合反应进行共聚，可以得到（a-2）的共聚物。链段（a-2）的构成为α-烯烃70～99质量%、α,β-不饱和酸的缩水甘油酯30～1质量%是适宜的。
接着，作为与该烯烃系共聚物（a-1）或（a-2）接枝聚合的聚合物或共聚物（b），其为由一种上述通式（1）所示的重复单元构成的均聚物或由两种以上构成的共聚物，例如可列举出聚甲基丙烯酸甲酯、聚丙烯酸乙酯、聚丙烯酸丁酯、聚丙烯酸-2-乙基己酯、聚苯乙烯、聚丙烯腈、丙烯腈-苯乙烯共聚物、丙烯酸丁酯-甲基丙烯酸甲酯共聚物、丙烯酸丁酯-苯乙烯共聚物等，特别优选为丙烯酸丁酯-甲基丙烯酸甲酯共聚物。这些聚合物或共聚物（b）也可通过对应的乙烯基系单体的自由基聚合来制备。
本发明中使用的接枝共聚物具有如下的特征，其并非单独使用（a-1）或（a-2）的烯烃系共聚物、或（b）的（共）聚合物（（共）聚合物表示共聚物或均聚物），其为具有（a-1）或（a-2）的共聚物与（b）的（共）聚合物在至少一处化学键合而成的支链或交联结构的接枝共聚物，通过具有如后所述的接枝结构，可获得仅单独配混（a-1）、（a-2）或（b）所无法得到的显著效果。此处，用于构成接枝共聚物的（a-1）或（a-2）与（b）的比例为95:5～5:95（质量比）、优选为80:20～20:80是适宜的。
作为苯乙烯系弹性体，优选由聚苯乙烯嵌段与聚烯烃结构的弹性体嵌段形成的嵌段共聚物等。作为这些嵌段共聚物，可列举出聚苯乙烯-聚异戊二烯-聚苯乙烯嵌段共聚物（SIS）、聚苯乙烯-聚（乙烯/丙烯）-聚苯乙烯嵌段共聚物（SEPS）、聚苯乙烯-聚（乙烯/丁烯）-聚苯乙烯嵌段共聚物（SEBS）、聚苯乙烯-聚（乙烯-乙烯/丙烯）-聚苯乙烯嵌段共聚物（SEEPS）等。这些苯乙烯系热塑性弹性体为包含芳香族乙烯基化合物、烯烃系化合物或共轭二烯化合物的嵌段共聚物。
核壳系弹性体为具有由核层（核部）、和覆盖该核层（核层的表面）的一部分或全部的壳层构成的多层结构的聚合物。核壳系弹性体的核层由橡胶成分（软质成分）构成，尤其优选为丙烯酸类橡胶成分。橡胶成分的玻璃化转变温度例如可以为不足0℃（例如，-10℃以下）、优选为-20℃以下（例如，-180～-25℃左右）、进一步优选为-30℃以下（例如，-150～-40℃左右）。
作为橡胶成分的丙烯酸类橡胶为以丙烯酸类单体［尤其是丙烯酸烷基酯（丙烯酸丁酯等丙烯酸C1-12烷基酯、优选为丙烯酸C1-8烷基酯、进一步优选为丙烯酸C2-6烷基酯）等丙烯酸酯］为主要成分的聚合物。丙烯酸类橡胶可以是丙烯酸类单体的均聚物或共聚物（丙烯酸类单体彼此的共聚物、丙烯酸类单体与其它含不饱和键的单体的共聚物等），也可以是丙烯酸类单体（和其它含不饱和键的单体）与交联性单体的共聚物。
接着，聚酯系弹性体可以分为聚醚型和聚酯型，只要其弯曲模量为1000MPa以下、优选为700MPa以下，就可以任意使用。弯曲模量超过1000Mpa时，得不到充分的柔软性。聚醚型是指以芳香族聚酯作为硬链段、以由氧化亚烷基二醇的聚合物和二羧酸形成的聚酯作为软链段的聚酯弹性体。硬链段中的芳香族聚酯单元是指二羧酸化合物与二羟基化合物的缩聚物、羟基羧酸化合物的缩聚物或者这三种成分化合物的缩聚物。例如聚对苯二甲酸丁二醇酯等可用作硬链段。作为软链段可以使用由聚亚烷基醚与二羧酸的缩聚而形成的化合物。例如，可以使用由四氢呋喃衍生的聚氧四亚甲基二醇的酯化合物。
聚酯型是指以芳香族聚酯为硬链段、非晶性聚酯为软链段的聚酯弹性体。硬链段中的芳香族聚酯单元与上述聚醚型同样。软链段是内酯的开环聚合物、即聚内酯、或者由脂肪族二羧酸与脂肪族二醇衍生的脂肪族聚酯。
对本发明使用的弹性体的种类没有特别的限定，具有缩水甘油基的弹性体由于与聚对苯二甲酸丁二醇酯树脂的密合优异，且熔接的成型品间的熔接强度也得到提高，故而优选，具有缩水甘油基的核壳系弹性体由于熔接强度和流动性的平衡良好故而更优选。但是，添加量多时，树脂组合物的粘度上升，因流动性的降低而得不到成型品，所以弹性体的添加量相对于100质量份聚对苯二甲酸丁二醇酯树脂（A），优选为5～20质量份、进一步优选为5～10质量份左右。
在不对熔接的成型品间的熔接强度产生不良影响的范围内，对于本发明的聚对苯二甲酸丁二醇酯树脂组合物，为了赋予所期望的特性，也可以配混通常在热塑性树脂和热固性树脂等中添加的公知的物质，即抗氧化剂、耐热稳定剂、紫外线吸收剂等稳定剂、抗静电剂、染料、颜料等着色剂、润滑剂、增塑剂和结晶促进剂、结晶成核剂、水解促进剂等。
为了赋予成型品的低翘曲性而添加苯乙烯-丙烯腈共聚物、苯乙烯-丁二烯-丙烯腈共聚物等树脂会降低熔接强度，故不优选。
关于本发明中使用的树脂组合物的制备，可以采用作为以往的树脂组合物制备法而通常使用的设备和方法来容易地制得。例如，可以使用1）将各成分混合后，通过单螺杆或双螺杆的挤出机将混合物混炼挤出，制备粒料，然后进行成型的方法；2）暂时制备组成不同的粒料，将该粒料按规定量混合并供于成型，成型后得到目标组成的成型品的方法；3）在成型机中直接投入1种或2种以上的各成分的方法等中的任意方法。此外，在谋求这些成分的均匀配混方面，将部分树脂成分制成微细粉体，与其以外的成分混合添加的方法为优选的方法。
＜熔接体＞
本发明的熔接体是将由本发明的聚对苯二甲酸丁二醇酯树脂组合物构成的成型品彼此熔接而成的。
由本发明的树脂组合物构成的成型品可以通过将本发明的树脂组合物利用现有公知的成型方法进行成型来制造。作为现有公知的成型方法，例如可列举出注射成型法等。
通过将如上所述制造的多个成型品进行熔接，制造本发明的熔接体。本发明中，对将成型品彼此进行熔接的方法没有特别的限定，可以使用现有公知的熔接方法。例如可列举出振动熔接、超声波熔接、旋转熔接、热线熔接、热板熔接、激光熔接。对进行这些熔接时的熔接条件没有特别的限定，可以根据成型品的形状等适当设定。
如上所述熔接法中，构成熔接的一个成型品的树脂组合物和、构成另一个成型品的树脂组合物在成型品彼此的接合部分附近、以熔融状态互相掺混，其后，进行固化，从而进行成型品间的接合。可以认为，本发明中，通过使聚对苯二甲酸丁二醇酯树脂的重均分子量处于60000以上且80000以下的范围，从而在混杂的树脂组合物中高分子间变得容易互相缠绕，成型品间的熔接强度显著提高。
上述熔接法之中，优选将成型品彼此抵接、在抵接面产生摩擦热而熔接的方法。作为在抵接面产生摩擦热而熔接的方法，可列举出振动熔接法、超声波熔接法、旋转熔接法。
振动熔接是指将成型品彼此重叠，使通过重叠而形成的抵接面成为上下压接的状态，在该状态下沿横向施加振动，利用所产生的摩擦热而进行熔接的方法。
超声波熔接是指将成型品彼此重叠，使通过重叠而形成的抵接面成为上下压接的状态，在该状态下通过超声波使抵接面产生纵向的振动，利用其摩擦热而进行熔接的方法。
旋转熔接是指将成型品彼此重叠，使通过重叠而形成的抵接面成为上下压接的状态，在该状态下通过使熔接的一个成型品高速旋转从而产生摩擦热来进行熔接的方法。
如上所述，对于利用摩擦热进行熔接的方法，通过对使成型体彼此重叠而形成的抵接面施加一定的压力并使成型品彼此熔接。通过摩擦热而熔融了的树脂组合物会被压力冲走，存在不充分施加按压力地进行熔接的可能性，但若使聚对苯二甲酸丁二醇酯树脂的重均分子量处于60000以上且80000以下的范围，则熔融的树脂组合物具有不被按压力冲走的水平的粘度，所以可以在充分负载按压力的条件下使成型品间熔接。
实施例
根据以下实施例进一步详细说明本发明，但本发明不限定于这些实施例。
＜材料＞
此外，所用成分的具体情况、物性评价的测定方法如下所述。
（A）聚对苯二甲酸丁二醇酯树脂（PBT树脂）
（A-1）PBT树脂：WinTech Polymer Ltd.制造重均分子量75000、结晶温度192℃
（A-2）PBT树脂：WinTech Polymer Ltd.制造重均分子量66500、结晶温度193℃
（A-3）PBT树脂：WinTech Polymer Ltd.制造重均分子量58000、结晶温度195℃
（A-4）PBT树脂：WinTech Polymer Ltd.制造重均分子量100000、结晶温度190℃
（A’）改性PBT树脂
（A’-1）改性PBT树脂：WinTech Polymer Ltd.制造重均分子量58000、间苯二甲酸30mol%改性
（B）玻璃纤维
（B-1）玻璃纤维：日本电气硝子株式会社制造的T127
（C）弹性体
（C-1）甲基丙烯酸缩水甘油酯改性丙烯酸类核壳聚合物：Rohm andHaas公司制造的EXL2314
（C-2）丙烯酸类核壳聚合物；Rohm and Haas公司制造的EXL2311
（C-3）乙烯/甲基丙烯酸缩水甘油酯-甲基丙烯酸甲酯/丙烯酸丁酯接枝共聚物：日油株式会社Modiper A4300
（C-4）乙烯-丙烯酸乙酯共聚物：Nippon Unicar Company LimitedNUC-6570
＜实施例1～7、比较例1～5＞
将表1所示的各成分秤量后干混，使用株式会社日本制钢所制造的30mm双螺杆挤出机TEX-30进行熔融混炼，制作粒料（制作条件：料筒温度260℃、喷出量15kg/h、螺杆转速130rpm）。接着，由该粒料制成各试验片，测定各物性。将结果一并示于表1中。
＜分子量＞
使用上述制作的聚对苯二甲酸丁二醇酯树脂组合物的粒料，通过东曹HLC-8120GPC制尺寸排阻色谱进行测定。色谱柱使用Polymer LaboratoriesPLgel5μm MiniMIX-C，洗脱液为CHCl3、流速0.5ml/min、检测器UV/254nm、温度40℃下测定，依据Polymer Laboratories公司制造的标准试样PolystyreneStandards（聚苯乙烯标准）（Mw：377400～580）来换算重均分子量。
＜熔融粘度＞
将粒料在140℃×3h的条件下干燥后，用东洋精机株式会社制造的CAPILOGRAPH、在孔口直径=1.0mm、机筒直径=9.55mm、料筒温度=260℃、剪切速度=1000sec-1的条件下测定熔融粘度（kPa·sec）。
＜流动长度＞
将粒料在140℃下干燥3小时后，成型为厚度2mm的棒状试验片，通过其流动长度（mm）进行判断。注射条件为料筒温度260℃、模具温度65℃、注射速度4m/min，并在3个水平的保压压力（50Mpa、75MPa、100MPa）下进行评价。
＜振动熔接强度＞
使用FANUC Corporation制造的ROBOSHOTα100iA，在料筒温度=260℃、注射速度=1m/min、保压压力=60MPa、模具温度=80℃、注射时间=25秒、冷却时间=10秒的条件下，成型为由图1所示的截面形状的2个构件形成的试验片。图1为示意性地示出振动熔接的2个成型品的截面的图，图1的（a）为表示整体的图，图1的（b）为图1的（a）中的用虚线包围的部分A的放大图。
接着，沿图1的（a）的箭头B所示方向施加压力，使该2个构件的端面彼此（图中的2处的A部）抵接，对该抵接而成的A部，使用Emerson Japan,Ltd.制造的Orbital100振动熔接机，在频率=203Hz、实际按压力=1.5Bar、熔接余量（welding margin）=1.0mm、振幅=0.8mm的条件下进行振动熔接。熔接后，将一部分试验片通过切削加工切下，用万能试验机（ORIENTEC CO.,LTD.制造的TENSILONUTA-50kN），在速度5.0mm/min下测定冲裁剪切强度作为振动熔接强度。
＜冷热处理后的振动熔接强度保持率＞
将1次循环设为“-40℃下30分钟、120℃下30分钟”，将上述振动熔接强度测定用试验片经过3000次循环进行处理后测定熔接强度，求出相对于处理前的熔接强度的保持率。
＜冷热处理后的材料强度保持率＞
使用FANUC Corporation制造的ROBOSHOT S2000i100B，在料筒温度=260℃、注射速度=1m/min、保压压力=60MPa、模具温度=80℃下制造依据ISO3167的拉伸试验片，依据ISO527测定拉伸强度。
另外，将1次循环设为“-40℃下30分钟、120℃下30分钟”，将上述拉伸试验片经过3000次循环处理后测定拉伸强度，求出相对于处理前的拉伸强度的保持率。
＜超声波熔接强度＞
使用住友重机械工业株式会社制造的SE100D，在料筒温度=260℃、注射速度=1m/min、保压压力=70MPa、模具温度=80℃、注射时间=10秒、冷却时间=10秒的条件下，成型为由图2所示的截面形状的2个构件形成的试验片。图2为示意性地示出超声波熔接的2个成型品的截面的图，图2的（a）为表示整体的图，图2的（b）为图2的（a）中的用虚线包围的部分C的放大图。
接着，与上述振动熔接的情况同样，使2个构件的端面彼此（图中的2处的C部）抵接，成为对抵接面施加压力的状态，对该抵接而成的C部，使用精电舍电子工业株式会社制造的超声波WELDER SONOPETΣ-1200超声波熔接机，在焊头振幅（horn amplitude）60μm、振荡频率20kHz、输出功率1.2kW、加压力0.1MPa的条件下进行超声波熔接。熔接后，将一部分试验片通过切削加工切下，用万能试验机（ORIENTEC CO.,LTD.制造的TENSILONUTA-50kN），在速度5.0mm/min下测定冲裁剪切强度作为超声波熔接强度。
[表1]
Figure BDA0000477138560000141
如表1记载确认到，包含分子量处于特定范围的聚对苯二甲酸丁二醇酯树脂的聚对苯二甲酸丁二醇酯树脂组合物的流动性优异、且将由本发明的树脂组合物构成的成型品彼此熔接而成的熔接体的成型品间的熔接强度强、耐热冲击性也优异。
需要说明的是，由“冷热处理后的材料强度保持率”的结果所示，即使对由包含分子量不同的聚对苯二甲酸丁二醇酯树脂的聚对苯二甲酸丁二醇酯树脂组合物构成的成型品分别实施相同冷热处理，成型品自身的强度也几乎未发现由分子量造成的影响。尽管如此，由“冷热处理后的振动熔接强度保持率”的结果所示，熔接体的耐热冲击性表现出由分子量造成的影响，本发明的分子量的范围中，显示优异的耐热冲击性。由以上确认到，聚对苯二甲酸丁二醇酯树脂的分子量尤其对熔接体的特性存在影响。

Claims (4)

1.一种聚对苯二甲酸丁二醇酯树脂组合物，其包含重均分子量为60000以上且80000以下的聚对苯二甲酸丁二醇酯树脂（A）和无机填充材料（B）。
2.根据权利要求1所述的聚对苯二甲酸丁二醇酯树脂组合物，其中，相对于100质量份聚对苯二甲酸丁二醇酯树脂（A），包含5～20质量份弹性体（C）。
3.一种熔接体，其是将由权利要求1或2所述的聚对苯二甲酸丁二醇酯树脂组合物构成的成型品彼此熔接而成的。
4.根据权利要求3所述的熔接体，其是将所述成型品彼此抵接、在抵接面产生摩擦热而熔接而成的。
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