CN106995547A - 一种eva微胶囊发泡母粒及制备工艺 - Google Patents
一种eva微胶囊发泡母粒及制备工艺 Download PDFInfo
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Abstract
一种EVA微胶囊发泡母粒及制备工艺,包括微胶囊发泡母粒的材料结构和制备微胶囊发泡母粒的工艺步骤,微胶囊发泡母粒的材料结构按质量百分比由33~50%的乙烯‑乙酸乙烯酯共聚物(EVA)粉末、65~40%的微胶囊发泡剂和2~10%的硅油组成。制备工艺及步骤包括:先将组分量的乙烯‑乙酸乙烯酯共聚物(EVA)研磨成不大于100微米粒径的粉末;然后再按组分量称取乙烯‑乙酸乙烯酯共聚物(EVA)粉末、微胶囊发泡剂和硅油,再将原料同时加入到密闭式混炼机混炼,混炼温度 50~70℃,混炼速度5~20r/min,混炼时间 8~15min;最后将混炼后的物料加入到螺杆式挤出造粒机造粒,造粒的温度控制在50~60°C,冷却后得到EVA微胶囊发泡母粒。
Description
所属技术领域:
本发明涉及一种微胶囊发泡母粒,特别涉及一种EVA微胶囊发泡母粒及制备工艺,属高分子辅料技术领域。
背景技术:
目前,EVA 发泡材料由 EVA 基体、AC 发泡剂、 交联剂、发泡促进剂、填料等组成,一般混炼温度在 110-120℃,混炼造粒后发泡,发泡是通过发泡剂分解产生气体实现的。其中AC 发泡剂的分解温度高,最低分解温度 140℃,能源消耗大;添加架桥剂交联 EVA 达到高温下产生的气体被控制在 EVA 基体内的目的,但交联后的材料不利于回收;发泡促进剂可以降低AC发泡剂的分解温度,最低可降至140℃。这种EVA发泡材料具有配方复杂,加工工序多,能源消耗大,回弹性不高,柔软性不够等缺点。物理发泡微胶囊是一种热膨胀性微胶囊。它外有热塑性壳层,内含低沸点有机溶剂,根据不同的用途直径为 5 ~ 100μm 不等。在技术上外壳称为壁材或囊膜,内含的有机溶剂称为芯材。受热时,芯材汽化产生足够的压力,迫使塑性化壁材膨胀,使微球的体积增大到原来的数十倍乃至100倍。 膨胀后的微胶囊具有相对的形状稳定性,冷却后不回缩。但是这种物理发泡剂的应用范围还比较有限。
发明内容:
为了让具有优良性能的物理发泡微胶囊的优越性应用到传统橡塑制品中,本发明公开一种EVA微胶囊发泡母粒及制备工艺。
本发明所采用的技术方案是:一种EVA微胶囊发泡母粒及制备工艺,包括微胶囊发泡母粒的材料结构和制备微胶囊发泡母粒的工艺步骤,微胶囊发泡母粒的材料结构按质量百分比由33~50%的乙烯-乙酸乙烯酯共聚物(EVA)粉末、65~40%的微胶囊发泡剂和2~10%的硅油组成;制备工艺及步骤包括:
(1)、磨粉:将组分量的乙烯-乙酸乙烯酯共聚物(EVA)研磨成不大于100微米粒径的粉末;
(2)、混炼:按组分量称取步骤1的乙烯-乙酸乙烯酯共聚物(EVA)粉末、微胶囊发泡剂和硅油,将原料同时加入到密闭式混炼机混炼,混炼温度 50~70℃,混炼时间 8~15min;
(3)、造粒:将步骤2混炼后的物料加入到螺杆式挤出造粒机造粒,造粒的温度控制在50~60°C,冷却后得到EVA微胶囊发泡母粒。
乙烯-乙酸乙烯酯共聚物(EVA)采用的是醋酸乙烯酯(VA)含量在 28-45 %的乙烯-醋酸乙烯酯共聚物。
微胶囊发泡剂采用的是以丙烯酸类树脂为壳体,内含碳氢化合物的微球,球径10-45微米,起泡温度 140℃的DU120微胶囊发泡剂。
本发明的有益效果是:采用本EVA微胶囊发泡母粒进行制品发泡制造时,所制得的制品因克服了化学发泡在接触模具表层不发泡的弊端,制品几乎里外一致的均匀发泡,可有效减轻制品重量10~40%,进而降低制品成本;此外,采用本EVA微胶囊发泡母粒因里外均匀发泡,可有效消除产品注塑和脱模时的缩水痕,制品外表美观的同时,因减少产品注塑后内应力及收缩所产生的弯曲或变形,还因减少注塑时保压时间,缩短注塑周期,可有效提高生产效率。
附图说明:
无附图说明
具体实施方式:
一种EVA微胶囊发泡母粒及制备工艺,包括微胶囊发泡母粒的材料结构和制备微胶囊发泡母粒的工艺步骤,微胶囊发泡母粒的材料结构按质量百分比由33~50%的乙烯-乙酸乙烯酯共聚物(EVA)粉末、65~40%的微胶囊发泡剂和2~10%的硅油组成;制备工艺及步骤包括:
1、磨粉:将组分量的乙烯-乙酸乙烯酯共聚物(EVA)研磨成不大于100微米粒径的粉末;
2、混炼:按组分量称取步骤1的乙烯-乙酸乙烯酯共聚物(EVA)粉末、微胶囊发泡剂和硅油,将原料同时加入到密闭式混炼机混炼,混炼温度 50~70℃, 混炼时间 8~15min;
3、造粒:将步骤2混炼后的物料加入到螺杆式挤出造粒机造粒,造粒的温度控制在50~60°C,冷却后得到EVA微胶囊发泡母粒。
乙烯-乙酸乙烯酯共聚物(EVA)采用的是醋酸乙烯酯(VA)含量在 28-45 %的乙烯-醋酸乙烯酯共聚物。
微胶囊发泡剂采用的是以丙烯酸类树脂为壳体,内含碳氢化合物的微球,球径10-45微米,起泡温度 140℃的DU120微胶囊发泡剂。
实施例:微胶囊发泡母粒的材料结构由48%的乙烯-乙酸乙烯酯共聚物(EVA)粉末、50%的微胶囊发泡剂和2%的硅油组成,其制备工艺及步骤:
1、磨粉:将组分量的乙烯-乙酸乙烯酯共聚物(EVA)在专用的磨粉设备里研磨成不大于100微米粒径的粉末;
2、混炼:按组分量称取乙烯-乙酸乙烯酯共聚物(EVA)粉末、微胶囊发泡剂和硅油,将原料同时加入到密闭式混炼机混炼,混炼温度 65℃正负2°C,混炼时间 12min。
3、造粒:将混炼后的物料加入到螺杆式挤出造粒机造粒,造粒的温度控制在55°C正负2°C,冷却后得到EVA微胶囊发泡母。
Claims (3)
1.一种EVA微胶囊发泡母粒及制备工艺,其特征是:包括微胶囊发泡母粒的材料结构和制备微胶囊发泡母粒的工艺步骤,微胶囊发泡母粒的材料结构按质量百分比由33~50%的乙烯-乙酸乙烯酯共聚物(EVA)粉末、65~40%的微胶囊发泡剂和2~10%的硅油组成;制备EVA微胶囊发泡母粒工艺及步骤包括:
(1)、磨粉:将组分量的乙烯-乙酸乙烯酯共聚物(EVA)研磨成不大于100微米粒径的粉末;
(2)、混炼:按组分量称取步骤1的乙烯-乙酸乙烯酯共聚物(EVA)粉末、微胶囊发泡剂和硅油,将原料同时加入到密闭式混炼机混炼,混炼温度 50~70℃,混炼时间 8~15min;
(3)、造粒:将步骤2混炼后的物料加入到螺杆式挤出造粒机造粒,造粒的温度控制在50~60°C,冷却后得到EVA微胶囊发泡母粒。
2.根据权利要求1所述的一种EVA微胶囊发泡母粒及制备工艺,其特征是:所述的乙烯-乙酸乙烯酯共聚物(EVA)采用的是醋酸乙烯酯(VA)含量在 28-45 %的乙烯-醋酸乙烯酯共聚物。
3.根据权利要求1所述的一种EVA微胶囊发泡母粒及制备工艺,其特征是:所述的微胶囊发泡剂采用的是:以丙烯酸类树脂为壳体,内含碳氢化合物的微球,球径10-45微米,起泡温度 140℃的DU120微胶囊发泡剂。
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CN110669278A (zh) * | 2019-11-17 | 2020-01-10 | 斯莱达医疗用品(惠州)有限公司 | 一种有效减少呼吸管路冷凝水管材 |
CN111300718A (zh) * | 2019-04-18 | 2020-06-19 | 美国投资公司 | 多核芯纤维复合材料内正交结构件、制作工艺和薄膜材料 |
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CN111300718A (zh) * | 2019-04-18 | 2020-06-19 | 美国投资公司 | 多核芯纤维复合材料内正交结构件、制作工艺和薄膜材料 |
CN114269538A (zh) * | 2019-04-18 | 2022-04-01 | 美国投资公司 | 多核芯纤维复合材料内正交结构件、制作工艺和薄膜材料 |
CN111300718B (zh) * | 2019-04-18 | 2023-10-13 | 美国投资公司 | 多核芯纤维复合材料内正交结构件、制作工艺和薄膜材料 |
CN110669278A (zh) * | 2019-11-17 | 2020-01-10 | 斯莱达医疗用品(惠州)有限公司 | 一种有效减少呼吸管路冷凝水管材 |
CN110669278B (zh) * | 2019-11-17 | 2022-04-26 | 斯莱达医疗用品(惠州)有限公司 | 一种有效减少呼吸管路冷凝水管材 |
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