CN114957847A - 一种eva超临界发泡鞋底及其制备方法 - Google Patents

一种eva超临界发泡鞋底及其制备方法 Download PDF

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CN114957847A
CN114957847A CN202210759053.6A CN202210759053A CN114957847A CN 114957847 A CN114957847 A CN 114957847A CN 202210759053 A CN202210759053 A CN 202210759053A CN 114957847 A CN114957847 A CN 114957847A
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陆猷良
卓东贤
瞿波
陆猷广
吴立新
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Abstract

本发明公开一种EVA超临界发泡鞋底,按重量份计,包括如下用量的原料:EVA 10~80份,OBC 10~30份,SEBS 0~20份,交联剂0.5~3份,填充剂0~20份,耐磨剂0~10份和均泡剂0.1~1份,所述均泡剂为甲基硅氧烷、乙烯基硅氧烷和丙烯基硅氧烷中的一种或几种的组合。本发明还公开了一种EVA超临界发泡鞋底的制备方法,以EVA、OBC、SEBS、交联剂、填充剂、耐磨剂和均泡剂为原料,依次经过造粒、注塑成型,之后经过N2超临界发泡,得到发泡鞋底,具有轻质性能的同时,又具有较好的回弹性能。

Description

一种EVA超临界发泡鞋底及其制备方法
技术领域
本发明涉及发泡材料技术领域,具体涉及的是一种EVA超临界发泡鞋底及其制备方法。
背景技术
随着TPU超临界CO2发泡制取ETPU及ETPU水蒸气成型鞋底的成功开发,各种鞋材的超临界发泡的研发与试产如火如荼地展开。EVA发泡材料无疑是鞋材市场的主力军,其主要做法是将EVA鞋底生胚经过超临界CO2或N2发泡成初胚,但初胚尺寸远大于设计的尺寸要求,必须经过模具二次回压定型到所需要的大小,这样必然耗时耗力,导致鞋底成本的飙升,其鞋底回弹性能也会受到损失。
针对EVA超临界发泡鞋底存在的上述问题,通过对EVA超临界发泡鞋材发泡机理和所得泡孔结构的研究,本发明旨在开发一种不仅具备EVA发泡材料的轻质、低硬度等特性,而且同时兼具优良回弹性的EVA超临界发泡鞋材。
发明内容
本发明的目的在于提供一种EVA超临界发泡鞋底,不仅具备轻质、低硬度等特性,而且具有较好的回弹性。
本发明的目的还在于提供一种EVA超临界发泡鞋底的制备方法。
为了达成上述目的,本发明的解决方案是:
一种EVA超临界发泡鞋底,按重量份计,包括如下用量的原料:EVA 10~80份,OBC10~30份,SEBS 0~20份,交联剂0.5~3份,填充剂0~20份,耐磨剂0~10份和均泡剂0.1~1份,所述均泡剂为甲基硅氧烷、乙烯基硅氧烷和丙烯基硅氧烷中的一种或几种的组合。
所述EVA为20~65份,所述OBC为10~20份,所述SEBS为5~15份,所述交联剂为0.5~2.5份,所述填充剂为5~15份,所述耐磨剂为2~7份,所述均泡剂为0.5~1.0份。
所述EVA为乙酸乙烯(VA)含量在10%~60%的乙烯-乙酸乙烯共聚物中的一种或几种的组合。
所述填充剂为滑石粉、硫酸钡和二氧化钛中的一种或几种的组合,所述耐磨剂为分子量在1~100万的聚硅氧烷,所述交联剂为过氧化二异丙苯、双叔丁基过氧异丙基苯、2,5-二甲基-2,5-双(过氧化叔丁基)己烷和过氧化(2-乙基己基)碳酸叔戊酯中的一种或几种的组合。
一种EVA超临界发泡鞋底的制备方法,包括以下步骤:
步骤1、先将10~80份EVA、10~30份OBC、0~20份SEBS、0.5~3份交联剂、0~20份填充剂、0~10份耐磨剂和0.1~1份均泡剂预混合在高混机中,得到组合物;
步骤2、然后将步骤1所得的组合物经过造粒后,在注塑温度为80~130℃、模具温度为150~200℃的条件下注塑,保压200~800s,制成鞋胚;
步骤3、最后将步骤2所得的鞋胚放入N2超临界釜中进行发泡,控制N2压力在10~20MPa,发泡温度为100~200℃,保温保压时间1~2h后泄压,取出冷却至室温,即得到成品鞋底。
采用上述技术方案后,本发明一种EVA超临界发泡鞋底,具有以下有益效果:
1、在原料中加入SEBS,在保持EVA发泡鞋材轻质、低硬度特性的基础上,可以适当降低成本;
2、在原料中加入均泡剂,可使得EVA超临界发泡鞋底的泡孔结构更加均一完整,当受到冲击应力时,可将应力均摊到每个泡孔上,保证该EVA超临界发泡鞋底具有轻质性能的同时,又具有较好的回弹性能;
3、由于在原料中加入均泡剂,使鞋底的泡孔结构细密而均匀,鞋胚经物理发泡就可以直接得到所要求的尺寸,无需二次回压。
因此,本发明一种EVA超临界发泡鞋底,不仅具备轻质、低硬度等特性,而且具有较好的回弹性。
本发明一种EVA超临界发泡鞋底的制备方法,以EVA、OBC、SEBS、交联剂、填充剂、耐磨剂和均泡剂为原料,依次经过造粒、注塑成型,之后经过N2超临界发泡,得到发泡鞋底,具有轻质性能的同时,又具有较好的回弹性能。
附图说明
图1为对比例制备得到的发泡鞋底的SEM图;
图2为实施例3制备得到的发泡鞋底的SEM图。
具体实施方式
为了进一步解释本发明的技术方案,下面通过具体实施例来对本发明进行详细阐述。
实施例1
1、EVA超临界发泡鞋底的组成
VA含量为10%的EVA 50份、SEBS 20份,OBC 20份,DCP(过氧化二异丙苯)2.0份、滑石粉5.0份、分子量为1万的聚硅氧烷6.2份、甲基硅氧烷0.8份。
2、EVA超临界发泡鞋底的制备
步骤1、先按配方比例,将上述各原料预混合在高混机中,得到组合物;
步骤2、然后将步骤1所得的组合物经过造粒后,在注塑温度为100℃、模具温度为180℃的条件下注塑,保压500s,制成鞋胚;
步骤3、最后将步骤2所得的鞋胚放入N2超临界釜中进行发泡,控制N2压力在12MPa,发泡温度为150℃,保温保压时间1.5h后泄压,取出冷却至室温,即得到成品鞋底。
实施例2
1、EVA超临界发泡鞋底的组成
VA含量为18%的EVA 62份、SEBS 10份,OBC 10份,BIBP(双叔丁基过氧异丙基苯)0.7份、硫酸钡10.3份、分子量为10万的聚硅氧烷6.2份、乙烯基硅氧烷0.8份。
2、EVA超临界发泡鞋底的制备
步骤1、先按配方比例,将上述各原料预混合在高混机中,得到组合物;
步骤2、然后将步骤1所得的组合物经过造粒后,在注塑温度为80℃、模具温度为150℃的条件下注塑,保压800s,制成鞋胚;
步骤3、最后将步骤2所得的鞋胚放入N2超临界釜中进行发泡,控制N2压力在15MPa,发泡温度为160℃,保温保压时间1.2h后泄压,取出冷却至室温,即得到成品鞋底。
实施例3
1、EVA超临界发泡鞋底的组成
VA含量为25%的EVA 62份、SEBS 10份,OBC 10份,BIBP(双叔丁基过氧异丙基苯)0.7份、滑石粉10.3份、分子量为1万的聚硅氧烷6.2份、丙烯基硅氧烷0.8份。
2、EVA超临界发泡鞋底的制备
步骤1、先按配方比例,将上述各原料预混合在高混机中,得到组合物;
步骤2、然后将步骤1所得的组合物经过造粒后,在注塑温度为130℃、模具温度为200℃的条件下注塑,保压200s,制成鞋胚;
步骤3、最后将步骤2所得的鞋胚放入N2超临界釜中进行发泡,控制N2压力在20MPa,发泡温度为180℃,保温保压时间1h后泄压,取出冷却至室温,即得到成品鞋底。
对比例
1、EVA超临界发泡鞋底的组成
VA含量为25%的EVA 62.8份、SEBS 10份,OBC 10份,BIBP(双叔丁基过氧异丙基苯)0.7份、滑石粉10.3份、分子量为1万的聚硅氧烷6.2份。
2、EVA超临界发泡鞋底的制备
步骤1、先按配方比例,将上述各原料预混合在高混机中,得到组合物;
步骤2、然后将步骤1所得的组合物经过造粒后,在注塑温度为110℃、模具温度为170℃的条件下注塑,保压400s,制成鞋胚;
步骤3、最后将步骤2所得的鞋胚放入N2超临界釜中进行发泡,控制N2压力在20MPa,发泡温度为180℃,保温保压时间1h后泄压,取出冷却至室温,即得到成品鞋底。
在该对比例中未添加均泡剂。
性能测试:
对各实施例中得到的成品鞋底进行物性性能测试,并与对比例中传统的发泡鞋底的性能进行比较,测试结果如表1所示。
表1各实施例和对比例的性能测试结果
Figure BDA0003720478460000061
从表1的数据可以看出,引入均泡剂的EVA超临界发泡鞋底,与未添加均泡剂的发泡鞋底相比,硬度、密度变化不大,而回弹性较好,说明该EVA超临界发泡鞋底具有轻质、低硬度性能的同时,又具有较好的回弹性能。
为直观地说明该EVA超临界发泡鞋底的泡孔结构的变化,将对比例和实施例3制备得到的成品鞋底进行扫描电镜测试,如图1和图2所示,可以看出,由于均泡剂的加入,改进后的EVA超临界发泡鞋底的泡孔细密,孔径均匀分布在30~50μm,泡孔形状呈规整的圆形,鞋底在受到应力冲击时,可以均匀分散到邻近的泡孔单元上,从而具有较高的回弹性能;而对比例中,泡孔大小不一,孔径分布在200~300μm,且大多呈不规则的椭圆形,鞋底在受到冲击应力时,更易变形,其回弹性能必然变差。
上述实施例和图式并非限定本发明的产品形态和式样,任何所属技术领域的普通技术人员对其所做的适当变化或修饰,皆应视为不脱离本发明的专利范畴。

Claims (5)

1.一种EVA超临界发泡鞋底,其特征在于:按重量份计,包括如下用量的原料:EVA 10~80份,OBC 10~30份,SEBS 0~20份,交联剂0.5~3份,填充剂0~20份,耐磨剂0~10份和均泡剂0.1~1份,所述均泡剂为甲基硅氧烷、乙烯基硅氧烷和丙烯基硅氧烷中的一种或几种的组合。
2.根据权利要求1所述的一种EVA超临界发泡鞋底,其特征在于:所述EVA为20~65份,所述OBC为10~20份,所述SEBS为5~15份,所述交联剂为0.5~2.5份,所述填充剂为5~15份,所述耐磨剂为2~7份,所述均泡剂为0.5~1.0份。
3.根据权利要求1所述的一种EVA超临界发泡鞋底,其特征在于:所述EVA为乙酸乙烯(VA)含量在10%~60%的乙烯-乙酸乙烯共聚物中的一种或几种的组合。
4.根据权利要求1所述的一种EVA超临界发泡鞋底,其特征在于:所述填充剂为滑石粉、硫酸钡和二氧化钛中的一种或几种的组合,所述耐磨剂为分子量在1~100万的聚硅氧烷,所述交联剂为过氧化二异丙苯、双叔丁基过氧异丙基苯、2,5-二甲基-2,5-双(过氧化叔丁基)己烷和过氧化(2-乙基己基)碳酸叔戊酯中的一种或几种的组合。
5.如权利要求1所述的一种EVA超临界发泡鞋底的制备方法,其特征在于:包括以下步骤:
步骤1、先将10~80份EVA、10~30份OBC、0~20份SEBS、0.5~3份交联剂、0~20份填充剂、0~10份耐磨剂和0.1~1份均泡剂预混合在高混机中,得到组合物;
步骤2、然后将步骤1所得的组合物经过造粒后,在注塑温度为80~130℃、模具温度为150~200℃的条件下注塑,保压200~800s,制成鞋胚;
步骤3、最后将步骤2所得的鞋胚放入N2超临界釜中进行发泡,控制N2压力在10~20MPa,发泡温度为100~200℃,保温保压时间1~2h后泄压,取出冷却至室温,即得到成品鞋底。
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