CN105385015B - 一种超轻eva鞋底及其制备方法 - Google Patents

一种超轻eva鞋底及其制备方法 Download PDF

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CN105385015B
CN105385015B CN201510952164.9A CN201510952164A CN105385015B CN 105385015 B CN105385015 B CN 105385015B CN 201510952164 A CN201510952164 A CN 201510952164A CN 105385015 B CN105385015 B CN 105385015B
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卢鑫
罗显发
丁思博
廖毅彬
王育玲
郭彩莲
林臭知
金校红
郑荣大
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Maotai Fujian New Material Technology Co ltd
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Abstract

本发明涉及有机高分子化合物技术领域,提供一种超轻EVA鞋底及其制备方法,由原料EVA、聚烯烃嵌段共聚物、PP弹性体、成核剂、发泡剂、交联剂、硬脂酸锌、氧化锌、硬脂酸、耐磨剂、纳米碳酸钙经过密炼、开炼、造粒制得超轻EVA料米,再经一次射出成型得到所述超轻EVA鞋底,所述超轻EVA鞋底密度小于0.1g/cm3,具有超轻、高弹、高尺寸稳定性、表面不易起皱等特点,特别适合生产高档、轻量、环保EVA运动休闲鞋,使穿着者行走更轻盈。

Description

一种超轻EVA鞋底及其制备方法
技术领域
本发明属于有机高分子化合物技术领域,特别涉及一种超轻EVA鞋底及其制备方法。
背景技术
鞋是每个人都离不开的生活必需品,出于舒适性的考虑,生活中人们更愿意选择轻一些的鞋靴。鞋的重量大小会对运动能力的发挥产生影响,鞋是下肢的附加物,重的鞋子更易使人在穿着的过程中产生脱落感。鞋的质量越大,人在运动中消耗的体能也就越多。生物力学专家表明,跑步会对膝盖造成剧烈的冲击,冲击力量大约是体重的3~5倍,跑步的时候整个人腾空而起,然后落地,瞬间再腾空而起,这些冲量主要由膝盖的软骨吸收。而鞋的重量每增加1克,每跑100米,人就会多消耗8%的体能;鞋的重量每减少1克,就相当于减轻560克的重力负担。对于热爱运动的人来说,轻量化的鞋,保持功能性不下降,将消耗穿着者更少的能量,并提高其运动效能和穿着舒适性。
普通EVA材料的密度为0.23-0.3g/cm3,力学性能及柔韧性不够好,研究人员都在寻找合适的EVA改性剂,以制得兼具不同发泡材料优点的超轻EVA发泡材料。专利CN102993546 B公开了天然橡胶和三元乙丙橡胶改性EVA,得到了超轻橡塑发泡材料。众所周知,天然橡胶和三元乙丙橡胶都是非结晶性聚合物,大倍率的发泡产品必然存在压缩变形大的问题,产品的稳定性不够好。专利CN 101497715 B公开了利用低密度聚乙烯和EVA得到了密度为0.035-0.06g/cm3的超轻发泡材料,但低密度聚乙烯是只有少量长支链的高结晶性聚合物,产品硬度大、弹性差,从而限制了它的使用。
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超轻EVA鞋底及其制备方法,所述超轻EVA鞋底具有超轻、高弹、高尺寸稳定性、表面不易起皱等特点,特别适合生产高档、轻量、环保EVA运动休闲鞋。
为实现上述目的,本发明采取的解决方案为:一种超轻EVA鞋底,由以下原料组成制得:EVA、聚烯烃嵌段共聚物、PP弹性体、成核剂、发泡剂、交联剂、硬脂酸锌、氧化锌、硬脂酸、耐磨剂、纳米碳酸钙。
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为VA含量在22%-28%之间。
进一步的是:所述PP弹性体为埃克森美孚Vistamaxx系列共聚物。
进一步的是:所述PP弹性体为DSC熔点在65-85度之间。
进一步的是:所述聚烯烃嵌段共聚物为邵氏硬度在50-65A之间。
进一步的是:所述聚烯烃嵌段共聚物为DSC熔点在115-125度内。
进一步的是:所述成核剂是聚烯烃成核剂HPN-20E。
进一步的是:所述发泡剂是AC发泡剂。
进一步的是:所述交联剂是BIBP。
进一步的是:所述耐磨剂是耐磨剂AG209。
一种制备所述超轻EVA鞋底的制备方法,包括步骤:
步骤1:制备超轻EVA料米,先将原料EVA、聚烯烃嵌段共聚物、PP弹性体、成核剂、发泡剂、交联剂、硬脂酸锌、氧化锌、硬脂酸、耐磨剂、纳米碳酸钙、颜料混合进行密炼,调整密炼温度为98-100℃,保持4-6min,然后翻料2次,继续密炼升温,出料温度为108-110℃,密炼结束后进行开炼、造粒,得到超轻EVA料米;
步骤2:将超轻EVA料米倒入一次EVA注射机台的吸料桶,经一次射出成型得到超轻EVA鞋底。
通过采取前述技术方案,本发明具有如下有益效果:
1,本发明使用结晶温度适中、力学性能好、相对分子量分布窄的聚烯烃嵌段共聚物和短支链分布、高弹性的PP弹性体作为EVA的改性剂,提供优异的回弹性,柔软韧性好,又能有效控制收缩保持尺寸稳定,得到超轻EVA鞋底的密度达到0.09g/cm3,而普通EVA鞋底的密度是0.23g/cm3-0.3g/cm3,大大降低了鞋底重量,节省了穿着者行走时的能量损耗,并直接降低了生产成本,增强了市场竞争优势,可广泛应用与儿童玩具、运动鞋、运动器材、浮标等的制造。
2,本发明使用聚烯烃成核剂,提高了鞋底成型时的结晶速度,使材料结晶率更高、晶形更大更均匀,明显改善了几种不同结晶温度材料的协同结晶性能,提高了材料的撕裂强度,有效改善了鞋底表面的光洁度。如附图1,实施例1的热稳定性明显好于未添加成核剂的实施例4。
3,本发明超轻EVA鞋底的结晶温度高,产品定型快、合格率高;鞋底极性大,成型加工方便,大大提高了生产效率,适合批量化生产。
4,本发明超轻EVA鞋底具有超低密度、高尺寸稳定性、力学性能优异等特点,而且具有比较好的缓冲和支撑性,提高了穿着舒适性,并使穿着者行走更轻盈。
附图说明
图1是本发明实施例1和实施例4制备得到的超轻EVA鞋底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,扫描频率10rad/s,应变0.2%,静态力250g,测试温度30-140度,升温速率5度/分钟,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,所述超轻EVA鞋底由以下组分按重量份组成:
所述超轻EVA鞋底的制备方法,包括步骤:
步骤1:制备超轻EVA料米,先将所有组分原料混合进行密炼,调整密炼温度为100℃,保持6min,然后翻料2次,继续密炼升温,出料温度为110℃,密炼结束后进行开炼、造粒,得到超轻EVA料米。
步骤2:将料米倒入一次EVA注射机台的吸料桶,经一次射出成型得到超轻EVA鞋底。
上述制备得到的超轻EVA鞋底,密度0.09g/cm3,硬度39,DIN耐磨192mm3,尺寸收缩0.2%,回弹率61%,压缩变形率48%,撕裂强度6.6N/mm,拉伸强度2.6MPa,动态止滑系数平滑干式0.70湿式0.48。
实施例2:
本实施例中,一种超轻EVA鞋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 7470M 50份、聚烯烃嵌段共聚物9077 30份、PP弹性体3000 25份、成核剂0.1份、AC发泡剂3.4份、交联剂BIBP 1.8份。
上述制备得到的超轻EVA鞋底,密度0.10g/cm3,硬度42,DIN耐磨224mm3,尺寸收缩0.9%,回弹率62%,压缩变形率53%,撕裂强度5.8N/mm,拉伸强度2.0MPa,动态止滑系数平滑干式0.70湿式0.43。
实施例3:
本实施例中,一种超轻EVA鞋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 265 50份、聚烯烃嵌段共聚物9507 25份、PP弹性体3020 23份、成核剂0.3份、AC发泡剂2.8份、交联剂BIBP 1.6份、耐磨剂3份、纳米碳酸钙2份。
上述制备得到的超轻EVA鞋底,密度0.09g/cm3,硬度37,DIN耐磨183mm3,尺寸收缩0.7%,回弹率59%,压缩变形率50%,撕裂强度6.2N/mm,拉伸强度2.5MPa,动态止滑系数平滑干式0.58湿式0.39。
实施例4:
实施例4中,一种超轻EVA鞋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:
成核剂0份。
上述制备得到的超轻EVA鞋底,密度0.09g/cm3,硬度39,DIN耐磨256mm3,尺寸收缩1.8%,回弹率62%,压缩变形率60%,撕裂强度5.1N/mm,拉伸强度2.0MPa,动态止滑系数平滑干式0.66湿式0.43。
将上述实施例1~4的数据整理后,得到如下表1(注:硬度采用GS-701N硬度计测试,DIN耐磨按照GB/T 9867:2001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H50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,动态止滑系数按照TM144:2011测试):
实施例1 实施例2 实施例3 实施例4
密度(g/cm3) 0.09 0.10 0.09 0.09
硬度 39 42 37 39
DIN耐磨(mm3) 192 224 183 256
尺寸收缩率(%) 0.2 0.9 0.7 1.8
回弹性(%) 61 62 59 62
压缩变形率(%) 48 53 50 60
撕裂强度(N/mm) 6.6 5.8 6.2 5.1
拉伸强度(MPa) 2.6 2.0 2.5 2.0
动态止滑系数(平滑干式) 0.70 0.70 0.58 0.66
动态止滑系数(平滑湿式) 0.48 0.43 0.39 0.43
表1、实施例1-4的性能参数对照表
综上所述,按照本发明的超轻EVA鞋底的制备方法,能够制得具有超低密度、高尺寸稳定性、表面不易起皱等特点的超轻EVA鞋底,而且具有力学性能好、产品定型速度快、产品合格率高等特点,可以使EVA鞋底更轻量化,特别适合生产高档EVA运动休闲鞋,节省了穿着者行走时的能量损耗,并直接降低了生产成本,增强了市场竞争优势。
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 (4)

1.一种超轻EVA鞋底,其特征在于,由以下原料组成制得:各原料的重量份如下:
EVA 50 份
聚烯烃嵌段共聚物 25 - 30 份
PP弹性体 20 - 25 份
成核剂 0 - 0.3 份
发泡剂 2.8 - 3.4 份
交联剂 1.6 - 1.8 份
硬脂酸锌 2 - 2.2 份
氧化锌 1.2 - 1.5 份
硬脂酸 1 - 1.3 份
耐磨剂 2 - 3 份
纳米碳酸钙 2 - 3份;
其中,所述EVA的VA重量含量在22%-28%之间;所述PP弹性体为埃克森美孚Vistamaxx系列共聚物,DSC熔点在65-85度之间;所述聚烯烃嵌段共聚物的邵氏硬度在50-65A之间,DSC熔点在115-125度之间。
2.根据权利要求1所述的超轻EVA鞋底,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
聚烯烃嵌段共聚物 26 份
PP弹性体 21 份
成核剂 0.2 份
发泡剂 3.1 份
交联剂 1.7 份
硬脂酸锌 2.2 份
氧化锌 1.3 份
硬脂酸 1.3 份
耐磨剂 2.5 份
纳米碳酸钙 3份。
3.根据权利要求1或2所述超轻EVA鞋底,其特征在于:所述成核剂是聚烯烃成核剂HPN-20E。
4.一种制备权利要求1-3任一所述超轻EVA鞋底的制备方法,其特征在于,包括如下步骤:
步骤1:制备超轻EVA料米,先将原料EVA、聚烯烃嵌段共聚物、PP弹性体、成核剂、发泡剂、交联剂、硬脂酸锌、氧化锌、硬脂酸、耐磨剂、纳米碳酸钙、颜料混合进行密炼,调整密炼温度为98-100℃,保持4-6min,然后翻料2次,继续密炼升温,出料温度为108-110℃,密炼结束后进行开炼、造粒,得到超轻EVA料米;
步骤2:将超轻EVA料米倒入一次EVA注射机台的吸料桶,经一次射出成型得到超轻EVA鞋底。
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WO2019147861A1 (en) * 2018-01-24 2019-08-01 Nike Innovate C.V. Sole structures including polyolefin plates and articles of footwear formed therefrom
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