CN105585740A - 一种醋酸纤维素开孔微孔发泡材料的制备方法 - Google Patents
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Abstract
本发明涉及一种醋酸纤维素开孔微孔发泡材料的制备方法,将醋酸纤维素、聚丙烯和助剂按比例混合后加入一定量的超临界二氧化碳,以超临界二氧化碳辅助挤出发泡制得醋酸纤维素开孔微孔发泡材料。本发明操作简单,原料便宜,所得材料可以广泛的应用于清洁海绵、抗震材料、衬垫材料、吸音材料和各种过滤材料,具有良好的市场应用前景。本发明制备得到的发泡材料,孔径为1~10微米,孔密度为106~109cells/cm3,开孔率大于80%。
Description
技术领域
本发明涉及一种醋酸纤维素材料,具体来说涉及一种醋酸纤维素开孔微孔发泡材料的制备方法。
背景技术
醋酸纤维素作为纤维素的衍生物,具有用途广泛、产品附加值高、生产方便、流程短、服用性能优良、生产过程无污染及原料可再生等优点,受到了全世界的广泛关注。目前醋酸纤维素主要应用于纺织品制造,香烟过滤材料,膜材料,生物组织工程材料等。
开孔发泡材料是指材料泡体中的泡孔间相互连通,泡体中的气相和材料都是连续相的泡沫材料。开孔发泡材料的特点是材料的聚合物基体中的泡孔不是封闭的,泡孔壁破裂,气泡间相互连通,能形成复杂的通道,让小分子气体或流体通过材料流动,通过的难易程度与聚合物材料的性能及开孔率有关。假如能够精确地控制开孔发泡材料中泡孔的尺寸和形态,就可以确定穿过材料的微粒的大小,使其起到分离作用,实现特殊用途。
开孔发泡材料(如聚氨酯、橡胶、乙烯-乙酸乙烯酯共聚物和聚丙烯等)由于其本身具有柔韧性和易加工性,被广泛使用作清洁海绵、抗震材料、衬垫材料、吸音材料和各种过滤材料。
由于醋酸纤维素特别是二醋酸纤维素的热降解温度与熔融温度接近,因此很难进行熔融加工,难以被广泛应用,因此有必要研发一种改善醋酸纤维素的发泡性能的醋酸纤维素发泡加工技术。
发明内容
为改善醋酸纤维素的热塑性及发泡性能,本发明提供一种醋酸纤维素开孔微孔发泡材料的制备方法。
本发明通过下列技术方案实现:一种醋酸纤维素开孔微孔发泡材料的制备方法,经过下列各步骤:
(1)按下列质量份的组分进行备料,并混合制得混合物料:
醋酸纤维素99~70份、聚丙烯1~30份、助剂1~10份;
(2)在步骤(1)的混合物料中加入1~10质量份的超临界二氧化碳,以超临界二氧化碳辅助挤出发泡制得醋酸纤维素开孔微孔发泡材料。
所述步骤(1)的醋酸纤维素为一醋酸纤维素、二醋酸纤维素或三醋酸纤维素。
所述步骤(1)的助剂包括增塑剂、发泡剂、稳定剂中的一种或几种。
所述增塑剂为柠檬酸酯类增塑剂。
所述发泡剂为偶氮类发泡剂或碳酸盐类发泡剂。
所述稳定剂为亚磷酸酯类稳定剂。
所述步骤(2)的以超临界二氧化碳辅助挤出发泡是采用常规双螺杆挤出发泡成型机组,控制入口温度为150~175℃、第一段温度为170~185℃、第二段温度为185~195℃、第三段温度为195~200℃、第四段温度为200~195℃、第五段温度195~185℃、模口温度为185~150℃,将步骤(1)所得混合物料加入,并在第二段加入超临界二氧化碳,挤出后在200~240℃下进行发泡1~5min。
聚丙烯材料作为一种热塑性工程塑料,具有良好的加工性能。由于其优异的流变性能及合适的熔体强度,在醋酸纤维素中加入聚丙烯材料,能降低醋酸纤维素的热加工温度,同时调节醋酸纤维素的熔体强度,改善醋酸纤维素的发泡性能。
本发明具备的优点及效果:本发明操作简单,原料便宜,所得材料可以广泛的应用于清洁海绵、抗震材料、衬垫材料、吸音材料和各种过滤材料,具有良好的市场应用前景。本发明制备得到的发泡材料,孔径为1~10微米,孔密度为106~109cells/cm3,开孔率大于80%。
具体实施方式
下面通过实施例对本发明做进一步说明。
实施例1
(1)按下列质量份的组分进行备料,并混合制得混合物料:
三醋酸纤维素99份、聚丙烯1份、柠檬酸三乙酯1份、碳酸钠5份、亚磷酸酯助剂4份;
(2)采用常规双螺杆挤出发泡成型机组,控制入口温度为150℃、第一段温度为175℃、第二段温度为185℃、第三段温度为195℃、第四段温度为200℃、第五段温度185℃、模口温度为150℃,将步骤(1)所得混合物料加入,再在第二段加入10质量份的超临界二氧化碳进行挤出,挤出后在240℃下进行发泡5min,即得醋酸纤维素开孔微孔发泡材料。经测定其平均孔径为8.4微米,孔密度为1.8×108cells/cm3,开孔率91%。
实施例2
(1)按下列质量份的组分进行备料,并混合制得混合物料:
二醋酸纤维素70份、聚丙烯30份、AC发泡剂1份;
(2)采用常规双螺杆挤出发泡成型机组,控制入口温度为175℃、第一段温度为185℃、第二段温度为195℃、第三段温度为200℃、第四段温度为195℃、第五段温度195℃、模口温度为185℃,将步骤(1)所得混合物料加入,再在第二段加入1质量份的超临界二氧化碳进行挤出,挤出后在200℃下进行发泡1min,即得醋酸纤维素开孔微孔发泡材料。经测定其平均孔径为9.4微米,孔密度为5.3×107cells/cm3,开孔率83%。
实施例3
(1)按下列质量份的组分进行备料,并混合制得混合物料:
一醋酸纤维素75份、聚丙烯25份、柠檬酸三丁酯1份、碳酸氢钠发泡剂3份、亚磷酸酯助剂1份;
(2)采用常规双螺杆挤出发泡成型机组,控制入口温度为165℃、第一段温度为170℃、第二段温度为190℃、第三段温度为195℃、第四段温度为200℃、第五段温度190℃、模口温度为175℃,将步骤(1)所得混合物料加入,再在第二段加入5质量份的超临界二氧化碳进行挤出,挤出后在230℃下进行发泡2min,即得醋酸纤维素开孔微孔发泡材料。经测定其平均孔径为2.6微米,孔密度为7.0×106cells/cm3,开孔率87%。
实施例4
(1)按下列质量份的组分进行备料,并混合制得混合物料:
二醋酸纤维素85份、聚丙烯15份、柠檬酸乙酯3份、AC发泡剂2份、亚磷酸酯助剂2份;
(2)采用常规双螺杆挤出发泡成型机组,控制入口温度为170℃、第一段温度为180℃、第二段温度为190℃、第三段温度为195℃、第四段温度为200℃、第五段温度190℃、模口温度为165℃,将步骤(1)所得混合物料加入,再在第二段加入6质量份的超临界二氧化碳进行挤出,挤出后在220℃下进行发泡2min,即得醋酸纤维素开孔微孔发泡材料。经测定其平均孔径为1.9微米,孔密度为2.2×109cells/cm3,开孔率82%。
实施例5
(1)按下列质量份的组分进行备料,并混合制得混合物料:
三醋酸纤维素95份、聚丙烯15份、柠檬酸乙酯4份、碳酸氢钙发泡剂2份、亚磷酸酯助剂3份;
(2)采用常规双螺杆挤出发泡成型机组,控制入口温度为160℃、第一段温度为180℃、第二段温度为195℃、第三段温度为200℃、第四段温度为195℃、第五段温度185℃、模口温度为170℃,将步骤(1)所得混合物料加入,再在第二段加入3质量份的超临界二氧化碳进行挤出,挤出后在240℃下进行发泡5min,即得醋酸纤维素开孔微孔发泡材料。经测定其平均孔径为3.5微米,孔密度为3.8×107cells/cm3,开孔率90%。
对比例1:同实施例2,仅删除聚丙烯,不使用聚丙烯。
对比例2:同实施例2,仅将聚丙烯替换为聚乳酸。
由上表对比可知,加入聚丙烯后,材料的孔径减小,孔密度增加,开口率也显著增加,明显的改善了醋酸纤维素的开孔发泡性能。
Claims (7)
1.一种醋酸纤维素开孔微孔发泡材料的制备方法,其特征在于经过下列各步骤:
(1)按下列质量份的组分进行备料,并混合制得混合物料:
醋酸纤维素99~70份、聚丙烯1~30份、助剂1~10份;
(2)在步骤(1)的混合物料中加入1~10质量份的超临界二氧化碳,以超临界二氧化碳辅助挤出发泡制得醋酸纤维素开孔微孔发泡材料。
2.根据权利要求1所述的制备方法,其特征在于:所述步骤(1)的醋酸纤维素为一醋酸纤维素、二醋酸纤维素或三醋酸纤维素。
3.根据权利要求1所述的制备方法,其特征在于:所述步骤(1)的助剂包括增塑剂、发泡剂、稳定剂中的一种或几种。
4.根据权利要求3所述的制备方法,其特征在于:所述增塑剂为柠檬酸酯类增塑剂。
5.根据权利要求3所述的制备方法,其特征在于:所述发泡剂为偶氮类发泡剂或碳酸盐类发泡剂。
6.根据权利要求3所述的制备方法,其特征在于:所述稳定剂为亚磷酸酯类稳定剂。
7.根据权利要求1所述的制备方法,其特征在于:所述步骤(2)的以超临界二氧化碳辅助挤出发泡是采用常规双螺杆挤出发泡成型机组,控制入口温度为150~175℃、第一段温度为170~185℃、第二段温度为185~195℃、第三段温度为195~200℃、第四段温度为200~195℃、第五段温度195~185℃、模口温度为185~150℃,将步骤(1)所得混合物料加入,并在第二段加入超临界二氧化碳,挤出后在200~240℃下进行发泡1~5min。
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Cited By (3)
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CN107983089A (zh) * | 2017-11-29 | 2018-05-04 | 苏州绿碳环保科技有限公司 | 一种工厂电厂炼厂烟气捕获、转化和应用全量资源化系统 |
WO2023220007A1 (en) * | 2022-05-09 | 2023-11-16 | Cryovac, Llc | Sustainable foam |
WO2024064815A1 (en) * | 2022-09-23 | 2024-03-28 | Eastman Chemical Company | Foamable cellulose acetate compositions comprising carbon dioxide and a chemical blowing agent and foams formed therefrom |
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CN107983089B (zh) * | 2017-11-29 | 2019-09-13 | 苏州绿碳环保科技有限公司 | 一种工厂电厂炼厂烟气捕获、转化和应用全量资源化系统 |
WO2023220007A1 (en) * | 2022-05-09 | 2023-11-16 | Cryovac, Llc | Sustainable foam |
WO2024064815A1 (en) * | 2022-09-23 | 2024-03-28 | Eastman Chemical Company | Foamable cellulose acetate compositions comprising carbon dioxide and a chemical blowing agent and foams formed therefrom |
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