CN105419070B - 一种迷彩eva长跑鞋中底及其制备方法 - Google Patents
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Abstract
本发明涉及有机高分子化合物技术领域，提供一种迷彩EVA长跑鞋中底及其制备方法，该鞋底材料随着运动频率的增大，阻尼因子先增大后减小，为运动鞋减震缓冲和推动力找到了最佳的平衡点，达到最大的能量吸收，特别适合做长跑鞋的中底材料，所述迷彩EVA长跑鞋中底由原料EVA、乙烯辛烯共聚物、发泡剂、交联剂、硬脂酸锌、氧化锌、硬脂酸、滑石粉经过密炼、开炼、造粒制得本色EVA料米，EVA料米再和颜料搅拌得到多种不同颜色的料米，然后将不同颜色的料米搅拌得到多种颜色混合料米，最后经升温发泡、二次油压成型得到。
Description
技术领域
本发明属于有机高分子化合物技术领域，特别涉及一种迷彩EVA长跑鞋中底及其制备方法。
背景技术
多孔结构的存在，赋予了发泡材料优异的能量吸收性能，使其能够被应用于生产和生活的诸多方面，当受到外界冲击或压缩载荷时，发泡材料能够通过自身的变形吸收部分能量。通常而言，材料的组成成分对于其阻尼性能的好坏起到了决定性作用，但是在不同的使用环境如温度、频率和振幅，以及发泡材料本身的密度，对于材料阻尼性能的影响也不容忽视。有相关研究(Polymer Testing，2001(20)：287-193；合成橡胶工业，38(2)，126-131)表明，发泡材料与其基体材料具有不同的粘弹性行为，填料含量、单位面积内微孔数量多少、泡孔壁的厚薄等因素都会直接影响发泡材料的阻尼因子。
动态力学热分析(DMA)是指测试材料在交变应力或交变应变的作用下的应变响应或应力响应：高分子在受到外力时，分子链之间容易产生相对运动，而分子内部化学键之间也能够自由旋转，使得聚合物在形变过程中，由于粘性形变而产生损耗模量，由于弹性形变产生储能模量，两者的比值用阻尼因子(即力学损耗tanδ)来表示。阻尼因子的大小代表了动态变形下能量损耗的大小。DMA能直接绘出损耗模量和tanδ值随温度或频率的变化，因而被广泛用于测定高分子粘弹性材料的阻尼性能，通常情况下，在发泡制品的使用温度和使用频率条件下，阻尼材料的tanδ值越高，其阻尼性能越好。
专利CN 103951921 A和CN 104177742 A公开了两种宽温域橡塑共混发泡材料，以醋酸乙烯酯含量为70％的乙烯-醋酸乙烯酯橡胶为主体材料，聚乳酸、超支化多元醇作为改性剂，有效拓宽了材料阻尼温域，提高了阻尼因子，制得的发泡材料具有泡孔均匀、力学性能优异、外表美观、环境友好性、有效阻尼温域超过100℃等有益效果，实现了聚合物自身粘弹性阻尼与微孔结构阻尼的叠加，是优异发泡阻尼材料。但是乙烯-醋酸乙烯酯橡胶的结晶性能差，闭孔容易变成联孔，导致泡孔部分塌陷，必然存在压缩变形大的问题，产品的稳定性不够好。目前，鲜有运动休闲鞋阻尼材料的相关研究报道。根据运动休闲鞋的使用环境选择最适合的频率范围，找到一种充分利用阻尼性能的材料，也是材料研究人员值得研究的课题。
发明内容
本发明的目的就是针对现有技术存在的不足而提供一种迷彩EVA长跑鞋中底及其制备方法，所述迷彩EVA长跑鞋中底随运动频率增大、阻尼因子先增大后减小的EVA鞋材，具有高能量吸收、高尺寸稳定性、综合力学性能好等特点，为运动鞋减震缓冲和推动力找到了最佳的平衡点，达到最大的能量吸收，特别适合做长跑鞋的中底材料。
为实现上述目的，本发明采取的解决方案为：所述的迷彩EVA长跑鞋中底，由以下原料组成制得：EVA、乙烯辛烯共聚物、发泡剂、交联剂、硬脂酸锌、氧化锌、硬脂酸、滑石粉、颜料。
进一步的是，各原料的重量份如下：
进一步优选的，各组分按下列重量份配置：
进一步的是：所述EVA的VA含量在10％-17％之间。
进一步的是：所述乙烯辛烯共聚物为陶氏EngageTM系列共聚物。
进一步的是：所述陶氏EngageTM系列共聚物至少包括8452、8440、8402、8480中的一种。
进一步的是：所述发泡剂是AC发泡剂；所述交联剂是交联剂BIBP。
进一步的是：所述颜料是塑料用无机或有机颜料，热稳定性高于190度。
一种制备所述迷彩EVA长跑鞋中底的制备方法，包括以下步骤：
步骤1：先将原料EVA、乙烯辛烯共聚物、发泡剂、交联剂、硬脂酸锌、氧化锌、硬脂酸、滑石粉混合进行密炼，调整密炼温度为95-98℃，保持4-6min，然后翻料2次，继续密炼升温，出料温度为105-107℃，密炼结束后进行开炼、造粒，得到本色EVA料米；
步骤2：本色EVA料米和不同种类颜料搅拌均匀，得到多种不同颜色的料米，然后将不同颜色的料米搅拌得到多种颜色混合料米。
步骤3：多种颜色混合料米，准确称量后，经升温发泡、二次油压成型，得到迷彩EVA长跑鞋中底。
通过采取前述技术方案，本发明具有如下有益效果：
1，普通EVA鞋底材料随运动频率的增大，阻尼因子先减小后增大，在一般的长跑运动频率区间(1-5Hz)，阻尼因子均小于0.11(如图1示)，导致鞋底反冲击力量较大，容易导致运动员受伤，而本发明的EVA长跑鞋中底随运动频率的增大，阻尼因子先增大后减小，在长跑运动频率区间(1-5Hz)的阻尼因子均大于0.144，甚至达到0.169，能有效吸收鞋底的冲击能量，减少运动伤害，同时，在低频时的阻尼因子小，能给脚步带来足够的反弹力。
2，本发明的迷彩EVA长跑鞋中底，通过选择合适的原材料型号和不同材料的比例，实现了聚合物自身粘弹性阻尼与微孔结构阻尼的有效结合，还可以根据特殊产品的需求，通过调整原材料的比例，实现阻尼因子峰值往低频率或高频率方向移动，使材料的阻尼性能得到更为充分的应用，适合不同运动频率的工作环境。
3，本发明迷彩EVA长跑鞋中底的生产工艺成熟、产品成型速度快，颜色艳丽吸引众人眼球，而且直接使用二次油压与橡胶贴合，避免接触有毒的处理剂和胶水，具有很好的发展前景。
附图说明
图1是本发明实施例1-3和对比例中制备得到的发泡材料的动态机械分析仪测试数据。
测试说明：美国TA公司的动态机械分析仪RSA G2，使用8mm平行板，压缩模式，测试温度30度，扫描频率0.05-500rad/s，应变0.5％，静态力400g。测试样品为直径12mm、高10mm的圆柱体。
具体实施方式
现结合具体实施例对本发明进一步说明。
实施例1：
本实施例中，所述迷彩EVA长跑鞋中底由以下组分按重量份组成：
所述迷彩EVA长跑鞋中底的制备方法，包括步骤：
步骤1：先将以上原料(除颜料之外)混合进行密炼，调整密炼温度为97℃，保持6min，然后翻料2次，继续密炼升温，出料温度为107℃，密炼结束后进行开炼、造粒，得到本色EVA料米；
步骤2：本色EVA料米和酞菁绿311在搅拌桶中搅拌均匀，得到绿色料米；本色EVA料米和永固黄1148在搅拌桶中搅拌均匀，得到黄色料米；本色EVA料米和永固红BH-5RK在搅拌桶中搅拌均匀，得到红色料米；然后将绿色料米、黄色料米和红色料米按比例搅拌得到多种颜色混合料米。
步骤3：多种颜色混合料米，准确称量后，经升温发泡、二次油压成型，得到迷彩EVA长跑鞋中底。
上述制备得到的迷彩EVA长跑鞋中底，密度0.16g/cm3，硬度50，尺寸收缩0.3％，回弹率38％，压缩变形率50％，撕裂强度8.7N/mm，拉伸强度2.5MPa，Tanδ峰值是0.148，Tanδ峰值对应的频率是1.41Hz。
实施例2：
本实施例中，一种迷彩EVA长跑鞋中底的制备方法与实施例1中的制备方法相同，所不同的是原料配比中：
EVA 7240M 45份、乙烯辛烯共聚物8440 30份、乙烯辛烯共聚物8480 15份、滑石粉8份、永固紫HR-256 0.2份、酞青蓝156 0.2份、永固橙TR139 0.2份。
上述制备得到的迷彩EVA长跑鞋中底，密度0.175g/cm3，硬度59，尺寸收缩0.2％，回弹率34％，压缩变形率54％，撕裂强度10.1N/mm，拉伸强度2.8MPa，Tanδ峰值是0.155，Tanδ峰值对应的频率是2.51Hz。
实施例3：
本实施例中，一种迷彩EVA长跑鞋中底的制备方法与实施例1中的制备方法相同，所不同的是原料配比中：
EVA V4110J 35份、EVA 550 20份、乙烯辛烯共聚物8452 35份、交联剂BIBP 1.8份、硬脂酸锌1.8份、滑石粉12份。
上述制备得到的迷彩EVA长跑鞋中底，密度0.152g/cm3，硬度49，尺寸收缩1.0％，回弹率32％，压缩变形率63％，撕裂强度6.4N/mm，拉伸强度2.1MPa，Tanδ峰值是0.169，Tanδ峰值对应的频率是0.79Hz。
对比例：
本对比例中，材料的制备方法与实施例1中的制备方法相同，所不同的是原料配比中的型号选择不同：
EVA V5110J替代EVA V4110J、EVA 7470M替代EVA 12J4、乙烯辛烯共聚物8003替代乙烯辛烯共聚物8402、乙烯辛烯共聚物8480替代乙烯辛烯共聚物8452。
上述制备得到的对比例EVA中底，密度0.21g/cm3，硬度53，尺寸收缩1.9％，回弹率48％，压缩变形率33％，撕裂强度8.9N/mm，拉伸强度2.7MPa。
将上述实施例1～3和对比例的数据整理后，得到如下表1(注：硬度采用GS-701N硬度计测试，尺寸收缩率按照70度40分钟测试，回弹率测试采用GT-7042-RE型冲击弹性试验机，压缩变形率按照50度6小时测试，撕裂强度按照GB/T 529-2008测试直角撕裂，拉伸强度按照GB/T 528-2009测试)：
表1、实施例1-4的性能参数对照表
综上所述，按照本发明的迷彩EVA长跑鞋中底的制备方法，能够制得随运动频率增大、阻尼因子先增大后减小的EVA鞋材，具有高能量吸收、高尺寸稳定性、综合力学性能好等特点的迷彩EVA长跑鞋中底，该鞋底材料随着运动频率的增大，阻尼因子先增大后减小，为运动鞋减震缓冲和推动力找到了最佳的平衡点，达到最大的能量吸收，特别适合做长跑鞋的中底材料。
以上所记载，仅为利用本创作技术内容的实施例，任何熟悉本项技艺者运用本创作所做的修饰、变化，皆属本创作主张的专利范围，而不限于实施例所揭示者。
Claims (3)
1.一种迷彩EVA长跑鞋中底，其特征在于，鞋底材料随着运动频率的增大，阻尼因子先增大后减小；
所述迷彩EVA长跑鞋中底，由以下重量份的原料组成制得：
EVA 45 - 55 份
乙烯辛烯共聚物 35 - 45 份
发泡剂 2.6 - 2.8 份
交联剂 1.6 - 1.8 份
硬脂酸锌 1.5 - 1.8 份
硬脂酸 1 - 1.2 份
氧化锌 1.5 - 1.8 份
滑石粉 8 - 12份
颜料 0.3 - 0.6份；
所述EVA的VA含量在10%-17%之间，所述EVA至少包括EVA V4110J、EVA 12J4、EVA7240M、EVA 550中的一种；所述乙烯辛烯共聚物为陶氏EngageTM系列共聚物，所述陶氏EngageTM系列共聚物至少包括8452、8440、8402、8480中的一种。
2.根据权利要求1所述的迷彩EVA长跑鞋中底，其特征在于：由以下组分按下列重量份原料制备而成:
EVA 50 份
乙烯辛烯共聚物 40 份
发泡剂 2.6 份
交联剂 1.7 份
硬脂酸锌 1.6 份
硬脂酸 1.2 份
氧化锌 1.5 份
滑石粉 10份
颜料 0.4份。
3.一种制备权利要求1-2任一所述迷彩EVA长跑鞋中底的制备方法，其特征在于，包括以下步骤：
步骤1：先将原料EVA、乙烯辛烯共聚物、发泡剂、交联剂、硬脂酸锌、氧化锌、硬脂酸、滑石粉混合进行密炼，调整密炼温度为 95-98℃，保持 4-6min，然后翻料2次，继续密炼升温，出料温度为105-107℃，密炼结束后进行开炼、造粒，得到本色EVA料米；
步骤2：本色EVA料米和不同种类颜料在搅拌桶中搅拌均匀，得到多种不同颜色的料米，然后将不同颜色的料米搅拌得到多种颜色混合料米；
步骤3：多种颜色混合料米，准确称量后，经升温发泡、二次油压成型，得到迷彩EVA长跑鞋中底。
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