CN108102338B - 一种发泡鞋中底 - Google Patents

一种发泡鞋中底 Download PDF

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CN108102338B
CN108102338B CN201810078516.6A CN201810078516A CN108102338B CN 108102338 B CN108102338 B CN 108102338B CN 201810078516 A CN201810078516 A CN 201810078516A CN 108102338 B CN108102338 B CN 108102338B
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张振秀
朱桐玉
戴欣汝
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Fujian Xingxun New Material Technology Co.,Ltd.
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    • C08J9/12Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
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    • A43FOOTWEAR
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    • C08J2453/00Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
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Abstract

本发明提供一种发泡鞋中底,这种鞋中底是由TPU、EVA、SEBS(MP‑10)、OBC等材料为原料,将TPU与其他一种或几种按配比称量好后混匀、交联,之后将交联后粒子放入高压反应釜中,通过超临界发泡得到发泡颗粒,然后将发泡颗粒放入模具中进行蒸汽成型,冷却后得到鞋中底成品。此款鞋中底具有优异的弹性和舒适性,同时又能适当降低成本,通过超临界法进行发泡,无毒、环保、无污染,具有非常广阔的市场。

Description

一种发泡鞋中底
技术领域
本发明属于高分子领域,涉及一种发泡材料的配方制备方法,主要用于鞋中底。
背景技术
近年来,随着阿迪达斯的boost系列运动鞋的火爆,TPU发泡材料越来越被人熟知,与传统的EVA发泡鞋底相比,TPU发泡鞋底具有低密度,轻质量、高回弹性、耐压缩,压缩永久形变率低、低温柔韧性、良好的机械力学性能、绿色安全环保,可再生利用等优点。作为性能优异的产品,当然其市场售价也较高,对于国内如此大的消费群体,这款boost鞋底在价格竞争力上还是不如传统的EVA发泡鞋底。因此,如何既能获得良好性能与舒适度的鞋材,又能适当降低成本,扩大市场占有率也显得尤为重要。专利CN102911430A公开了一种EVA/TPU/POE复合发泡材料的制备方法,在此专利中,发明人将EVA与TPU、POE共混发泡后,来得到一种性能优于普通EVA鞋底的材料,其中以EVA为主,TPU和POE所占比例都比较少,其中还加入了EVA接枝马来酸酐(EVA-g-MA)来提高相容性,这几者共混均匀后,加入发泡剂偶氮二甲酰胺和交联剂过氧化二异丙苯进行化学发泡,得到发泡鞋底材料。专利CN 103642200A公开了一种发泡热塑性聚氨酯珠粒及其制备方法,其中也是以TPU为原料,加入适量的熔体粘度调节剂,其中EVA、PVC、ABS、SBS都是以熔体粘度调节剂加入配方中,用量较少且无需交联,用来解决TPU发泡后产品收缩的问题。
TPU原材料的价格高;目前TPU爆米花产品的收缩,都是现在存在的问题。
发明内容
本发明的目的在于提供一种发泡鞋中底,其不仅具有TPU爆米花鞋底的高弹耐磨、耐压缩的高性能,还具有更好的柔软性和舒适度,同时适当的降低了成本。本发明以TPU、EVA、SEBS(MP-10)、OBC为原料挤出共混后造粒,然后对其进行交联,制备得到一种新的弹性体粒子,将此粒子放入高压反应釜中,通过超临界发泡得到其发泡颗粒,然后将发泡颗粒放入模具中进行蒸汽成型,冷却后得到鞋中底成品。
为实现上述目的,本发明一种发泡鞋中底,其中,所述的鞋中底是由TPU与EVA、SEBS(MP-10)、OBC共混后,经过交联,之后将交联后材料进行超临界发泡,得到发泡鞋中底;其特征在于,所述配方为TPU含量为总份数的50-90%,EVA、SEBS(MP-10)、OBC的含量为总份数的10-50%;发泡鞋中底的制备工艺为:将TPU、EVA、SEBS(MP-10)、OBC按配方配比称量好,进行共混、造粒、交联后得到粒子,将此粒子放入带有水的超临界反应釜中,加入物理发泡剂,然后对反应釜进行升温、加压,达到超临界状态,饱和0.5-2h后,泄压,得到发泡颗粒,将颗粒放入模具中通入蒸汽进行二次成型,冷却后得到发泡鞋中底成品。
其中,交联方式可以为动态交联或辐射交联,动态交联选用过氧化物为交联剂,如DCP、BIPB、双二五中的任一种,用量为EVA、SEBS(MP-10)、OBC份数总和的0.1-0.6%;辐射交联为电子束辐照交联,辐照剂量为25-80kGy。
其中,超临界发泡过程中的工艺如下:将交联后粒子放入带有水超临界反应釜中,然后向反应釜中加入戊烷,然后通入CO2、N2中的一种或者两者混合物,使反应釜温度控制在30-140℃之间,釜内压力达到7-20Mpa,饱和0.5-2h,之后泄压,得到弹性体发泡材料。
其中,蒸汽二次成型工艺中,蒸汽压力为0.15-0.4Mpa,热压时间为50s,冷却时间为120s。
本发明的有益效果为:以TPU、EVA、SEBS(MP-10)、OBC共混料为原材料,经过交联后增加了弹性,之后进过超临界发泡后,得到发泡颗粒,此发泡颗粒弹性好,密度轻,收缩小,耐黄变,且易于成型,将此发泡颗粒蒸汽成型后,得到了兼具性能和舒适度的鞋中底,而且适当降低了成本。
具体实施方式
下面通过具体的实施例对本发明的技术方案进行详细的说明,但是本发明的范围不受这些实施例的限制。
实施例1-2
TPU、EVA、OBC、MP-10按照配方配比称量好,然后将配方中粒料混匀,加入挤出机中,挤出机温度设置为180℃-185℃-190℃-200℃,挤出后,吹干,切粒,将粒子送入电子束辐射室中进行辐射交联,将交联后粒子放入超临界反应釜中,釜中加入水和戊烷,然后通入气体,开启搅拌,升温,饱压一定时间后,泄压,得到发泡颗粒,然后将这些发泡颗粒放入鞋底模具中通入蒸汽,进行二次成型,冷却定型后得到鞋中底成品。
实施例1-2的具体配方、工艺参数和性能见表1。
表1
Figure BDA0001560299700000031
实施例3-4
TPU、EVA、OBC、MP-10按照配方配比称量好,然后称取交联剂DCP,用量分别为EVA、OBC、MP-10总质量份数之和的0.4%,然后将各种原料混匀,加入挤出机中,挤出机温度设置为180℃-185℃-190℃-200℃,挤出后,吹干,切粒得到动态交联粒子,将粒子放入超临界反应釜中,釜中加入水和戊烷,然后通入气体,开启搅拌,升温,饱压一定时间后,泄压,得到发泡颗粒,然后将这些发泡颗粒放入鞋底模具中通入蒸汽,进行二次成型,冷却定型后得到鞋中底成品。实施例3-4的具体配方、工艺参数和性能见表2。
表2
Figure BDA0001560299700000041
上述仅为本发明具体实施方式,但本发明的设计构思并不局限于此,凡利用此构思对本发明进行非实质性的改动,均应属于侵犯本发明保护范围的行为。

Claims (3)

1.一种发泡鞋中底的制备方法,其特征在于,
所述发泡鞋中底由TPU与EVA、SEBS MP-10、OBC共混后,经过交联,之后将交联后材料进行超临界发泡,得到发泡鞋中底;所述发泡鞋中底的配方为TPU含量为总份数的50-90%,EVA、SEBS MP-10、OBC的含量为总份数的10-50%;
所述发泡鞋中底的制备工艺为:1)将TPU、EVA、SEBS MP-10、OBC按配方配比称量好,进行共混、造粒、交联后得到粒子;2)将此粒子放入带有水的超临界反应釜中,然后向反应釜中加入戊烷,然后通入CO2和N2的混合物,对反应釜进行升温、加压,达到超临界状态,使反应釜温度控制在30-140℃之间,釜内压力达到7-20MPa,饱和0.5-2h,泄压,得到发泡颗粒;3)将发泡颗粒放入模具中通入蒸汽进行二次成型,蒸汽压力为0.15-0.4MPa,热压时间为50s,冷却时间为120s,冷却后得到发泡鞋中底成品。
2.根据权利要求书1所述的一种发泡鞋中底的制备方法,其特征在于,所述交联方式可以为动态交联或辐射交联,动态交联选用过氧化物为交联剂,用量为EVA、SEBS MP-10、OBC份数总和的0.1-0.6%;辐射交联为电子束辐照交联,辐照剂量为25-80kGy。
3.根据权利要求书2所述的一种发泡鞋中底的制备方法,其特征在于,所述动态交联选用的交联剂为DCP、BIPB、双二五中的任一种。
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