CN106319966B - 一种白细胞滤膜的处理方法 - Google Patents
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Abstract
本发明公开了一种白细胞滤膜的处理方法,先利用聚维酮进行表面改性,再利用共聚物进行化学涂覆,基于两步法的组合处理方法,可明显提高第二步化学涂覆聚合物对纤维表面的润湿,达到均匀的涂覆,减少空白点,同时,第一步化学表面改性后,纤维对白细胞的吸附起到一定的作用。涂覆均匀后,可以提高纤维对白细胞的吸附率,在设计白细胞滤器的时候也可以适当减少滤膜从而降低血液在过滤器里的残留,同时由于纤维表面涂覆均匀,血液对纤维的润湿效果也好,在过滤过程中,减少堵塞的概率。
Description
技术领域
本发明涉及医疗卫生和材料领域,具体地说涉及一种白细胞滤膜的处理方法。
背景技术
目前在白细胞过滤器滤膜处理方法上有等离子接枝法、化学接枝、辐照法、化学涂覆法等,采用的原料主要是丙烯酸类的单体,单体包括含碱性的提供正电荷的,含有羟基提供亲水性的。
文献报道的这些方法都是单一的处理方法,等离子法、辐照接枝不稳定,而且耐湿热灭菌不理想,亲水性稍差,但接枝的主要以单体和小分子多,官能团发挥的吸附作用要强,化学表面改性能提高滤材纤维表面的结构,提高白细胞的吸附性能。化学涂覆法主要是大分子多,耐湿热好,亲水性好,但功能团发挥的作用稍弱。
发明内容
发明目的:本发明的目的是提供一种白细胞滤膜的处理方法,结合化学表面改性和化学涂覆以显著改善纤维表面的亲水性和血液相容性问题。
技术方案:为了实现上述发明目的,本发明的一种白细胞滤膜的处理方法,包括如下步骤:
(1)表面改性:选用聚酯纤维无纺布作为基材,浸泡于聚维酮溶液中,取出后抽滤,再浸没于过硫酸钠溶液中浸泡,取出后洗涤、干燥;
(2)将表面改性的聚酯纤维无纺布浸没于甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯按一定比例混合的聚合物醇溶液中,取出后干燥;
所述聚酯纤维无纺布为聚对苯二甲酸乙二酯经过喷熔制成。
聚维酮的全称为“聚乙烯吡咯烷酮(polyvinyl pyrrolidone)”,简称PVP,是一种非离子型高分子化合物。所述步骤(1)的聚维酮溶液按质量百分比含有6~15%聚维酮,溶剂为乙醇、水按体积比4比1配制而成。优选地,溶液按质量百分比含有聚维酮12%。
所述步骤(1)中浸泡在聚维酮溶液的时间为5~8小时,浸泡在过硫酸钠溶液的时间为4~6小时,最后于80~110℃下干燥4~6小时。作为本发明的优选方案,所述步骤(1)中浸泡在聚维酮溶液的时间为6小时,溶液温度40~45摄氏度;浸泡在过硫酸钠溶液的时间为5小时,溶液温度45摄氏度;最后于100摄氏度下干燥5小时。
为了保证聚酯无纺布理化指标合格(包括易氧化物、蒸发残渣、微粒含量、重金属),采用去离子水进行洗涤,直到洗脱水电导率<2.0μs/cm。
所述聚合物醇溶液中先将乙醇、甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯的混合物按体积比9∶1混合,经聚合反应后获得聚合物溶液;再配制成20倍体积的聚合物溶液水溶液使聚合物沉淀,用水清洗以去除残留单体;再溶于乙醇中配置1w/v%的乙醇溶液。
进一步地,所述混合物中,甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯的摩尔比为7∶3~8∶2。本领域技术人员在掌握相关领域的知识和有限次数试验下,在不脱离本发明保护范围的基础上可对该数值范围进行进一步调整优化。
所述步骤(2)中浸没时间为18~24小时,取出后真空干燥。
本发明所述的聚酯纤维无纺布选用聚对苯二甲酸乙二酯材料制成的,但基于本发明的处理方法上,该处理方法的基材包括但不限于聚对苯二甲酸乙二酯制成的无纺布。对于聚对苯二甲酸乙二酯制成的无纺布相同或相近性能的其他聚酯无纺布,都可以用本发明所述的处理方法进行处理。本发明所述聚酯纤维无纺布,其重量为80-100g/m2,孔隙率为75%,厚度0.8mm。
有益效果:本发明采用两步处理方法,可以明显提高第二步化学涂覆聚合物对纤维表面的润湿,达到均匀的涂覆,减少空白点,同时,第一步化学表面改性后,纤维对白细胞的吸附起到一定的作用。涂覆均匀后,可以提高纤维对白细胞的吸附率,在设计白细胞滤器的时候也可以适当减少滤膜从而降低血液在过滤器里的残留,同时由于纤维表面涂覆均匀,血液对纤维的润湿效果也好,在过滤过程中,减少堵塞的概率。
具体实施方式
下面结合具体实施例对本发明进行进一步说明。
实施例1
一种白细胞滤膜的处理方法,选用聚对苯二甲酸乙二酯经过喷熔制成的聚酯纤维无纺布作为基材,其重量为80-100g/m2,孔隙率为75%,厚度0.8mm。
将上述基材浸泡于质量百分比8%的聚维酮聚维酮溶液中(溶剂为乙醇、水按体积比4比1配制而成),浸泡时间为5~8小时,溶液温度40~45摄氏度,然后取出后抽滤,再浸没于质量百分比5%的过硫酸钠溶液中浸泡4~6小时,浸没温度为45摄氏度,然后取出洗涤,洗涤直到洗脱水电导率<2.0μs/cm,于100摄氏度下干燥5小时。
将表面改性的聚酯纤维无纺布浸没于甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯按一定比例混合的聚合物醇溶液中,浸没时间为18~24小时,取出后真空干燥。
聚合物醇溶液中先将乙醇、甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯的混合物按体积比9∶1混合,经聚合反应后获得聚合物溶液;再配制成20倍体积的聚合物溶液水溶液使聚合物沉淀,用水清洗以去除残留单体;再溶于乙醇中配置1w/v%的乙醇溶液。其中,甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯的摩尔比为7∶3。
实施例2
一种白细胞滤膜的处理方法,选用聚对苯二甲酸乙二酯经过喷熔制成的聚酯纤维无纺布作为基材,其重量为80-100g/m2,孔隙率为75%,厚度0.8mm。
将上述基材浸泡于质量百分比12%的聚维酮聚维酮溶液中(溶剂为乙醇、水按体积比4比1配制而成),浸泡时间为8小时,溶液温度40摄氏度,然后取出后抽滤,再浸没于质量百分比8%的过硫酸钠溶液中浸泡4小时,浸没温度为45摄氏度,然后取出洗涤,洗涤直到洗脱水电导率<2.0μs/cm,于100摄氏度下干燥5小时。
将表面改性的聚酯纤维无纺布浸没于甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯按一定比例混合的聚合物醇溶液中,浸没时间为18~24小时,取出后真空干燥。
聚合物醇溶液中先将乙醇、甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯的混合物按体积比9∶1混合,经聚合反应后获得聚合物溶液;再配制成20倍体积的聚合物溶液水溶液使聚合物沉淀,用水清洗以去除残留单体;再溶于乙醇中配置1w/v%的乙醇溶液。其中,甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯的摩尔比为7∶3。
实施例3
一种白细胞滤膜的处理方法,选用聚对苯二甲酸乙二酯经过喷熔制成的聚酯纤维无纺布作为基材,其重量为80-100g/m2,孔隙率为75%,厚度0.8mm。
将上述基材浸泡于质量百分比8%的聚维酮聚维酮溶液中(溶剂为乙醇、水按体积比4比1配制而成),浸泡时间为6小时,溶液温度5摄氏度,然后取出后抽滤,再浸没于质量百分比5%的过硫酸钠溶液中浸泡5小时,浸没温度为45摄氏度,然后取出洗涤,洗涤直到洗脱水电导率<2.0μs/cm,于100摄氏度下干燥5小时。
将表面改性的聚酯纤维无纺布浸没于甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯按一定比例混合的聚合物醇溶液中,浸没时间为18~24小时,取出后真空干燥。
聚合物醇溶液中先将乙醇、甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯的混合物按体积比9∶1混合,经聚合反应后获得聚合物溶液;再配制成20倍体积的聚合物溶液水溶液使聚合物沉淀,用水清洗以去除残留单体;再溶于乙醇中配置1w/v%的乙醇溶液。其中,甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯的摩尔比为8∶2。
以上所述仅是本发明的优选实施方式,应当指出:对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
试验例 血液评价试验
将上述实施例1~3两步法处理的滤膜作为三组试验组,并进一步基于相同基材的聚酯纤维无纺布进行对比试验处理:
对比组1:处理方法与实施例1相同,区别在于没有进行化学涂覆,只经过表面改性处理;
对比组2:处理方法与实施例1相同,区别在于没有进行化学表面改性,只进行了化学涂覆处理;
对比组3:处理方法与实施例1相同,区别在于:聚维酮溶液的质量百分比为5%,过硫酸钠的质量百分比为6%。
对比组4:处理方法与实施例1相同,区别在于:由50%摩尔的甲基丙烯酸2-羟基乙酯和50%摩尔的甲基丙烯酸二甲基氨基乙酯通过聚合反应获得聚合物溶液。
针对上述三组试验组和四组对比组,利用如下方法进行血液评价:
将处理后的聚酯无纺布剪成直径90mm大小,叠7层于直径90mm的圆形滤器壳体中。利用约500ml的全血(含有100ml抗凝剂)借助重力作用通过过滤器进行血液过滤,计算过滤后血液中白细胞的残留量,白细胞残留量检测通过将过滤后的血液用Turk溶液稀释5倍,再移入100ul计数板上,通过光学显微镜进行计数;并进一步计算红细胞回收率,结果如表1所示:
表1不同处理方法的血液评价试验结果
序号 | 白细胞残留量(个) | 红细胞回收率(%) |
实施例1 | 0.5×10<sup>5</sup> | 90.7% |
实施例2 | 0.4×10<sup>5</sup> | 89.8% |
实施例3 | 0.7×10<sup>6</sup> | 91.3% |
对比组1 | 2.3×10<sup>6</sup> | 90.3% |
对比组2 | 1.3×10<sup>6</sup> | 89.3% |
对比组3 | 0.8×10<sup>6</sup> | 89.5% |
对比组4 | 1.1×10<sup>6</sup> | 90.1% |
从上述对比结果可以看出,采用单纯的表面处理或化学涂覆,白细胞残留量显著高于本发明处理方法对应的结果,且聚维酮和过硫酸钠的含量,会较大地影响到最终血液评价结果,从而可以看出本发明提供的技术方案取得了更佳的技术效果。
Claims (4)
1.一种白细胞滤膜的处理方法,其特征在于包括如下步骤:
(1)表面改性:选用聚酯纤维无纺布作为基材,浸泡于聚维酮溶液中,取出后抽滤,再浸没于过硫酸钠溶液中浸泡,取出后采用去离子水进行洗涤,直到洗脱水电导率<2.0μs/cm,干燥;
(2)将表面改性的聚酯纤维无纺布浸没于甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯混合合成的聚合物乙醇溶液中,取出后干燥;
所述聚酯纤维无纺布为聚对苯二甲酸乙二酯经过喷熔制成;
所述步骤(1)中浸泡在聚维酮溶液的时间为6小时,溶液温度40~45摄氏度;浸泡在过硫酸钠溶液的时间为5小时,溶液温度45摄氏度;最后于100摄氏度下干燥5小时;
所述步骤(1)的聚维酮溶液按质量百分比含有6~15%聚维酮,溶剂为乙醇、水按体积比4比1配制而成;
甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯的摩尔比为7:3~8:2。
2.根据权利要求1所述的一种白细胞滤膜的处理方法,其特征在于:所述聚合物乙醇溶液中先将乙醇、甲基丙烯酸2-羟基乙酯和甲基丙烯酸二甲基氨基乙酯的混合物按体积比9:1混合,经聚合反应后获得聚合物溶液;
再配制成20倍体积的聚合物溶液水溶液使聚合物沉淀,用水清洗以去除残留单体;
再溶于乙醇中配置1 w/v %的乙醇溶液。
3.根据权利要求1所述的一种白细胞滤膜的处理方法,其特征在于:所述步骤(2)中浸没时间为18~24小时,取出后真空干燥。
4.根据权利要求1所述的一种白细胞滤膜的处理方法,其特征在于:所述聚酯纤维无纺布的重量为80-100g/m2,孔隙率为75%,厚度0.8mm。
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