CN115300661A - 一种医用抗菌纱布及其制备方法 - Google Patents
一种医用抗菌纱布及其制备方法 Download PDFInfo
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- CN115300661A CN115300661A CN202211104250.0A CN202211104250A CN115300661A CN 115300661 A CN115300661 A CN 115300661A CN 202211104250 A CN202211104250 A CN 202211104250A CN 115300661 A CN115300661 A CN 115300661A
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- antibacterial
- gauze
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- Materials For Medical Uses (AREA)
Abstract
本发明公开了一种医用抗菌纱布及其制备方法,涉及医用纱布技术领域,配方包括:棉纤维、壳聚糖纤维、竹纤维、陶瓷纤维、抗菌剂、氧化石墨烯分散液和整理液;制备方法,包括以下步骤:步骤一,抗菌剂制备;步骤二,一次抗菌处理;步骤三,混纺处理;步骤四,二次抗菌处理。通过多种纤维混纺,以棉纤维为主体,配合壳聚糖纤维、竹纤维和陶瓷纤维混纺成医用纱布,较粗的经纱和较细的纬纱混纺,使纱布的表面形成不平整的网格状,提高纱布的透气性,减少纱布黏连伤口,同时通过壳聚糖纤维的使用,通过壳聚糖纤维与棉纤维混纺,可提高该纱布表面的顺滑性,减少纱布与伤口的分泌物产生黏连,减轻患者痛苦。
Description
技术领域
本发明涉及医用纱布技术领域,具体为一种医用抗菌纱布及其制备方法。
背景技术
皮肤是保护人体免受侵害的第一道屏障,人们在日常生活中,难免会遇到各种意外,造成皮肤的损伤。烧伤是最为常见的一种类型,烧伤的程度往往是较大面积的皮肤损伤,而且在愈合的过程中极易在环境中受到病菌的感染,容易引起伤口的恶化,现有用于治疗轻度烧伤的主要是医用纱布,现有的医用纱布价格低廉,具有良好的透气性,但是仍然存在一些问题。
医用纱布通常由棉纤维制作而成,由于其高的通透性,抗菌性能较差,如果长时间不更换,容易滋生细菌,造成伤口再次感染,减缓了伤口的愈合速度;同时伤口的分泌物与纱布黏连在一起,不易将纱布从伤口处揭除,在揭除纱布时给患者造成很大的痛苦,而且不易透风,在高温潮湿的环境中极易滋生病菌,易造成伤口再次感染,给患者造成很大的伤害,而现有的抗菌性医用纱布大多在现有医用纱布基础上喷涂抗菌材料,提高现有医用纱布的抗菌性,但是抗菌性能较差,仍然不能满足需求,因此,现阶段提供一种医用抗菌纱布及其制备方法。
发明内容
本发明的目的在于提供一种医用抗菌纱布及其制备方法,以解决上述背景技术中提出的问题。
为实现上述目的,本发明提供如下技术方案:一种医用抗菌纱布,配方包括:棉纤维、壳聚糖纤维、竹纤维、陶瓷纤维、抗菌剂、氧化石墨烯分散液和整理液,各组分的重量份数分别是:棉纤维60~63份、壳聚糖纤维45~48份、竹纤维35~38份、陶瓷纤维8~10份、抗菌剂1.1~1.5份、氧化石墨烯分散液1.5~3份和整理液3~5份。
优选地,所述抗菌剂包括重量份数分别为36~38份的大叶桉叶、10~12份的黄栌叶、20~25份的黄连和8~10份的黄芩。
优选地,所述整理液包括重量份数分别为2~5份的羟丙基-β-环糊精,7~8份的柠檬酸,1~3份的磷酸二氢钠和90~110份的水。
一种医用抗菌纱布的制备方法,包括以下步骤:步骤一,抗菌剂制备;步骤二,一次抗菌处理;步骤三,混纺处理;步骤四,二次抗菌处理;
其中上述步骤一中,将抗菌剂原料进行粉碎处理,然后加入450~500份的水进行煎煮,煎煮至体积为原来的二十分之一,然后再过滤处理,再向滤渣中加入滤渣重量45~50倍量的体积分数为70~75%的酒精溶液,于40~45℃、30~35kHz超声提取30~40分钟,过滤,合并所有滤液,再蒸发至无酒精状态,然后使用AB-8大孔树脂进行纯化,收集纯化液,冷冻干燥至无水分,安全无毒,制得抗菌剂;
其中上述步骤二中,首先抗菌剂中加水,搅拌均匀,使抗菌剂的质量浓度为0.1~0.3%,得抗菌液,然后将陶瓷纤维浸于抗菌液中,直至完全吸收,再进行冷冻干燥至含水量为0~3%,制得抗菌陶瓷纤维;冷冻干燥,温度为-35~-32℃;
其中上述步骤三中,将棉纤维和抗菌陶瓷纤维进行混纺,得中心纤维;将竹纤维与二分之一的中心纤维进行混纺,使竹纤维包裹中心纤维,得纬纱;将竹纤维、壳聚糖纤维与中心纤维进行混纺,使壳聚糖纤维包裹粗中心纤维,得经纱;将经纱和纬纱进行纺织,制得一次抗菌处理的医用抗菌纱布;
其中上述步骤四中,将步骤三中制得的医用抗菌纱布置于整理液中进行浸轧处理,然后进行蒸汽交联,再水洗后得到羟丙基-β-环糊精修饰的纱布,然后将修饰后的纱布浸渍于氧化石墨烯分散液中,加热反应,取出后水洗得到石墨烯修饰的纱布,再经过冷风干燥得到二次抗菌处理的医用抗菌纱布;浸轧处理后纱布的带液率为100~110%,蒸汽交联温度140~160℃,蒸汽交联时间3~5min;所述氧化石墨烯分散液中氧化石墨烯的浓度为1~3mg/mL,添加的抗坏血酸与氧化石墨烯的质量比为0.5~10:1;加热反应温度为60~80℃,反应时间为2~3h;冷风干燥温度为6~8℃。
与现有技术相比,本发明的有益效果是:通过多种纤维混纺,以棉纤维为主体,配合壳聚糖纤维、竹纤维和陶瓷纤维混纺成医用纱布,较粗的经纱和较细的纬纱混纺,使纱布的表面形成不平整的网格状,提高纱布的透气性,减少纱布黏连伤口,同时通过壳聚糖纤维的使用,通过壳聚糖纤维与棉纤维混纺,可提高该纱布表面的顺滑性,减少纱布与伤口的分泌物产生黏连,减轻患者痛苦,通过对陶瓷纤维混纺前就进行一次抗菌处理,提高该医用纱布的抗菌性能,通过对陶瓷纤维进行冷冻干燥,增加陶瓷纤维的多孔性,进而增强医用纱布的吸水性和透气性。
本发明通过大叶桉叶、黄栌叶、黄连和黄芩的使用,在大叶桉叶和黄栌叶的基础上,增加黄连和黄芩,其中黄连可治痈肿疔疮,具有抗菌、抗毒和抗溃疡的作用,进一步提高抗菌效果,其中黄芩具有止血和治痈肿疔疮的效果,且具有较好的抗菌性,不产生抗药性,如此,通过大叶桉叶、黄栌叶、黄连和黄芩配合,作为抗菌剂使用,具有明显的抗菌效果。
本发明在制备方法上在制成医用纱布后,再一次进行抗菌处理,通过氧化石墨烯分散液的使用,实现对医用纱布进行第二次抗菌处理,进一步提高医用纱布的抗菌性,通过陶瓷纤维多孔性,便于与氧化石墨烯分散液充分结合,便于陶瓷纤维充分吸收氧化石墨烯分散液,且通过整理剂将氧化石墨烯分散液很好的固化在医用纱布上,便于抗菌使用,进一步提高医用纱布的抗菌效果,实用性高。
附图说明
图1为本发明的方法流程图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
请参阅图1,本发明提供的一种技术方案:
实施例1
一种医用抗菌纱布,配方包括:棉纤维、壳聚糖纤维、竹纤维、陶瓷纤维、抗菌剂、氧化石墨烯分散液和整理液,各组分的重量份数分别是:棉纤维60份、壳聚糖纤维45份、竹纤维35份、陶瓷纤维8份、抗菌剂1.1份、氧化石墨烯分散液1.5份和整理液3份;抗菌剂包括重量份数分别为36份的大叶桉叶、10份的黄栌叶、20份的黄连和8份的黄芩,整理液包括重量份数分别为2份的羟丙基-β-环糊精,7份的柠檬酸,1份的磷酸二氢钠和90份的水。
一种医用抗菌纱布的制备方法,包括以下步骤:步骤一,抗菌剂制备;步骤二,一次抗菌处理;步骤三,混纺处理;步骤四,二次抗菌处理;
其中上述步骤一中,将抗菌剂原料进行粉碎处理,然后加入450份的水进行煎煮,煎煮至体积为原来的二十分之一,然后再过滤处理,再向滤渣中加入滤渣重量45倍量的体积分数为70%的酒精溶液,于40℃、30kHz超声提取30分钟,过滤,合并所有滤液,再蒸发至无酒精状态,然后使用AB-8大孔树脂进行纯化,收集纯化液,冷冻干燥至无水分,安全无毒,制得抗菌剂;
其中上述步骤二中,首先抗菌剂中加水,搅拌均匀,使抗菌剂的质量浓度为0.1%,得抗菌液,然后将陶瓷纤维浸于抗菌液中,直至完全吸收,再进行冷冻干燥至含水量为3%,制得抗菌陶瓷纤维;冷冻干燥,冷冻温度为-35℃;
其中上述步骤三中,将棉纤维和抗菌陶瓷纤维进行混纺,得中心纤维;将竹纤维与二分之一的中心纤维进行混纺,使竹纤维包裹中心纤维,得较细的纬纱;将竹纤维、壳聚糖纤维与中心纤维进行混纺,使壳聚糖纤维包裹粗中心纤维,得较粗的经纱;将经纱和纬纱进行纺织,制得一次抗菌处理的医用抗菌纱布;
其中上述步骤四中,将步骤三中制得的医用抗菌纱布置于整理液中进行浸轧处理,然后进行蒸汽交联,再水洗后得到羟丙基-β-环糊精修饰的纱布,然后将修饰后的纱布浸渍于氧化石墨烯分散液中,加热反应,取出后水洗得到石墨烯修饰的纱布,再经过冷风干燥得到二次抗菌处理的医用抗菌纱布;浸轧处理后纱布的带液率为100%,蒸汽交联温度140℃,蒸汽交联时间3min;氧化石墨烯分散液中氧化石墨烯的浓度为1mg/mL,添加的抗坏血酸与氧化石墨烯的质量比为3:1;加热反应温度为60℃,反应时间为2h;冷风干燥温度为6℃。
实施例2
一种医用抗菌纱布,配方包括:棉纤维、壳聚糖纤维、竹纤维、陶瓷纤维、抗菌剂、氧化石墨烯分散液和整理液,各组分的重量份数分别是:棉纤维62份、壳聚糖纤维47份、竹纤维37份、陶瓷纤维9份、抗菌剂1.3份、氧化石墨烯分散液2份和整理液4份;抗菌剂包括重量份数分别为37份的大叶桉叶、11份的黄栌叶、23份的黄连和9份的黄芩,整理液包括重量份数分别为3份的羟丙基-β-环糊精,7份的柠檬酸,2份的磷酸二氢钠和100份的水。
一种医用抗菌纱布的制备方法,包括以下步骤:步骤一,抗菌剂制备;步骤二,一次抗菌处理;步骤三,混纺处理;步骤四,二次抗菌处理;
其中上述步骤一中,将抗菌剂原料进行粉碎处理,然后加入480份的水进行煎煮,煎煮至体积为原来的二十分之一,然后再过滤处理,再向滤渣中加入滤渣重量48倍量的体积分数为73%的酒精溶液,于43℃、33kHz超声提取35分钟,过滤,合并所有滤液,再蒸发至无酒精状态,然后使用AB-8大孔树脂进行纯化,收集纯化液,冷冻干燥至无水分,安全无毒,制得抗菌剂;
其中上述步骤二中,首先抗菌剂中加水,搅拌均匀,使抗菌剂的质量浓度为0.2%,得抗菌液,然后将陶瓷纤维浸于抗菌液中,直至完全吸收,再进行冷冻干燥至含水量为2%,制得抗菌陶瓷纤维;冷冻干燥,冷冻温度为-33℃;
其中上述步骤三中,将棉纤维和抗菌陶瓷纤维进行混纺,得中心纤维;将竹纤维与二分之一的中心纤维进行混纺,使竹纤维包裹中心纤维,得较细的纬纱;将竹纤维、壳聚糖纤维与中心纤维进行混纺,使壳聚糖纤维包裹粗中心纤维,得较粗的经纱;将经纱和纬纱进行纺织,制得一次抗菌处理的医用抗菌纱布;
其中上述步骤四中,将步骤三中制得的医用抗菌纱布置于整理液中进行浸轧处理,然后进行蒸汽交联,再水洗后得到羟丙基-β-环糊精修饰的纱布,然后将修饰后的纱布浸渍于氧化石墨烯分散液中,加热反应,取出后水洗得到石墨烯修饰的纱布,再经过冷风干燥得到二次抗菌处理的医用抗菌纱布;浸轧处理后纱布的带液率为105%,蒸汽交联温度150℃,蒸汽交联时间4min;氧化石墨烯分散液中氧化石墨烯的浓度为2mg/mL,添加的抗坏血酸与氧化石墨烯的质量比为5:1;加热反应温度为70℃,反应时间为2h;冷风干燥温度为7℃。
实施例3
一种医用抗菌纱布,配方包括:棉纤维、壳聚糖纤维、竹纤维、陶瓷纤维、抗菌剂、氧化石墨烯分散液和整理液,各组分的重量份数分别是:棉纤维63份、壳聚糖纤维48份、竹纤维38份、陶瓷纤维10份、抗菌剂1.5份、氧化石墨烯分散液3份和整理液5份;抗菌剂包括重量份数分别为38份的大叶桉叶、12份的黄栌叶、25份的黄连和10份的黄芩,整理液包括重量份数分别为5份的羟丙基-β-环糊精,8份的柠檬酸,3份的磷酸二氢钠和110份的水。
一种医用抗菌纱布的制备方法,包括以下步骤:步骤一,抗菌剂制备;步骤二,一次抗菌处理;步骤三,混纺处理;步骤四,二次抗菌处理;
其中上述步骤一中,将抗菌剂原料进行粉碎处理,然后加入500份的水进行煎煮,煎煮至体积为原来的二十分之一,然后再过滤处理,再向滤渣中加入滤渣重量50倍量的体积分数为74%的酒精溶液,于45℃、35kHz超声提取40分钟,过滤,合并所有滤液,再蒸发至无酒精状态,然后使用AB-8大孔树脂进行纯化,收集纯化液,冷冻干燥至无水分,安全无毒,制得抗菌剂;
其中上述步骤二中,首先抗菌剂中加水,搅拌均匀,使抗菌剂的质量浓度为0.3%,得抗菌液,然后将陶瓷纤维浸于抗菌液中,直至完全吸收,再进行冷冻干燥至含水量为3%,制得抗菌陶瓷纤维;冷冻干燥,冷冻温度为-32℃;
其中上述步骤三中,将棉纤维和抗菌陶瓷纤维进行混纺,得中心纤维;将竹纤维与二分之一的中心纤维进行混纺,使竹纤维包裹中心纤维,得较细的纬纱;将竹纤维、壳聚糖纤维与中心纤维进行混纺,使壳聚糖纤维包裹粗中心纤维,得较粗的经纱;将经纱和纬纱进行纺织,制得一次抗菌处理的医用抗菌纱布;
其中上述步骤四中,将步骤三中制得的医用抗菌纱布置于整理液中进行浸轧处理,然后进行蒸汽交联,再水洗后得到羟丙基-β-环糊精修饰的纱布,然后将修饰后的纱布浸渍于氧化石墨烯分散液中,加热反应,取出后水洗得到石墨烯修饰的纱布,再经过冷风干燥得到二次抗菌处理的医用抗菌纱布;浸轧处理后纱布的带液率为110%,蒸汽交联温度160℃,蒸汽交联时间5min;氧化石墨烯分散液中氧化石墨烯的浓度为3mg/mL,添加的抗坏血酸与氧化石墨烯的质量比为8:1;加热反应温度为80℃,反应时间为3h;冷风干燥温度为8℃。
对比例
一种医用抗菌纱布,由以下重量份的原料制成:棉纤维62、壳聚糖纤维46、竹纤维37、海藻纤维18、聚乳酸纤维15、陶瓷纤维8、抗菌剂1.2。
所述的抗菌剂,由以下重量份的原料组成:大叶桉叶36、苦楝皮24、木槿花17、黄栌叶10,将所有原料粉碎,加入所有原料重量70倍量的水,煎煮至体积为原来的1/20,过滤,向滤渣中加入滤渣重量50倍量的体积分数为72%的酒精溶液,于43℃、31kHz超声提取30分钟,过滤,合并所有滤液,旋转蒸发至无酒精,过AB-8大孔树脂进行纯化,收集纯化液,冷冻干燥至无水分,安全无毒,得抗菌剂。
所述的陶瓷纤维,长度为32~34mm。
一种医用抗菌纱布的制备方法,包括以下步骤:
(1)向抗菌剂中加水,搅拌均匀,使抗菌剂的质量浓度为0.25%,得抗菌液;
(2)将陶瓷纤维浸于抗菌液中,完全吸收后,抑制病菌滋生,加快伤口愈合,将陶瓷纤维冷冻干燥至含水量为0~3%,温度为-35℃,增加陶瓷纤维的多孔性,使纱布的吸水性和透气性明显增强,得抗菌陶瓷纤维;
(3)将棉纤维、竹纤维和抗菌陶瓷纤维进行混纺,增强中心纤维的抗菌性、透气性和吸水性,得中心纤维;
(4)将海藻纤维与1/2的中心纤维进行混纺,使海藻纤维包裹中心纤维,号数为12tex,利于提高伤口微循环,促进新陈代谢,加快伤口愈合,得粗中层纤维;
(5)将壳聚糖纤维与粗中层纤维进行混纺,使壳聚糖纤维包裹粗中层纤维,提高纱布的顺滑性,避免纱布与伤口的分泌物产生黏连,减轻患者痛苦,得纬纱;
(6)将聚乳酸纤维与剩下1/2的中心纤维进行混纺,使聚乳酸纤维包裹中心纤维,号数为8tex,安全无毒,增加经纱的抗菌性和生物性,促进伤口愈合,得经纱;
(7)将经纱和纬纱进行纺织,使纱布的表面形成不平整的网格状,提高纱布的透气性,避免纱布黏连伤口,促进伤口愈合,减轻患者痛苦,得医用抗菌纱布。
基于上述,各组分性质如下表所示:
通过采用上述技术方案,通过多种纤维混纺,以棉纤维为主体,配合壳聚糖纤维、竹纤维和陶瓷纤维混纺成医用纱布,较粗的经纱和较细的纬纱混纺,使纱布的表面形成不平整的网格状,提高纱布的透气性,减少纱布黏连伤口,同时通过壳聚糖纤维的使用,通过壳聚糖纤维与棉纤维混纺,可提高该纱布表面的顺滑性,减少纱布与伤口的分泌物产生黏连,减轻患者痛苦,通过对陶瓷纤维混纺前进行抗菌处理,提高该医用纱布的抗菌性能,通过对陶瓷纤维进行冷冻干燥,增加陶瓷纤维的多孔性,进而增强医用纱布的吸水性和透气性。
与现有技术相比,本发明通过大叶桉叶、黄栌叶、黄连和黄芩的使用,在大叶桉叶和黄栌叶的基础上,增加黄连和黄芩,其中黄连可治痈肿疔疮,具有抗菌、抗毒和抗溃疡的作用,进一步提高抗菌效果,其中黄芩具有止血和治痈肿疔疮的效果,且具有较好的抗菌性,不产生抗药性,如此,通过大叶桉叶、黄栌叶、黄连和黄芩配合,作为抗菌剂使用,具有明显的抗菌效果。
与现有技术相比,本发明在制备方法上在制成医用纱布后,再一次进行抗菌处理,通过氧化石墨烯分散液的使用,实现对医用纱布进行第二次抗菌处理,进一步提高医用纱布的抗菌性,通过陶瓷纤维多孔性,便于与氧化石墨烯分散液充分结合,便于陶瓷纤维充分吸收氧化石墨烯分散液,且通过整理剂将氧化石墨烯分散液很好的固化在医用纱布上,进一步提高医用纱布的抗菌效果,实用性高。
对于本领域技术人员而言,显然本发明不限于上述示范性实施例的细节,而且在不背离本发明的精神或基本特征的情况下,能够以其他的具体形式实现本发明。因此,无论从哪一点来看,均应将实施例看作是示范性的,而且是非限制性的,本发明的范围由所附权利要求而不是上述说明限定,因此旨在将落在权利要求的等同要件的含义和范围内的所有变化囊括在本发明内。不应将权利要求中的任何附图标记视为限制所涉及的权利要求。
Claims (8)
1.一种医用抗菌纱布,配方包括:棉纤维、壳聚糖纤维、竹纤维、陶瓷纤维、抗菌剂、氧化石墨烯分散液和整理液,其特征在于:各组分的重量份数分别是:棉纤维60~63份、壳聚糖纤维45~48份、竹纤维35~38份、陶瓷纤维8~10份、抗菌剂1.1~1.5份、氧化石墨烯分散液1.5~3份和整理液3~5份。
2.根据权利要求1所述的一种医用抗菌纱布,其特征在于:所述抗菌剂包括重量份数分别为36~38份的大叶桉叶、10~12份的黄栌叶、20~25份的黄连和8~10份的黄芩。
3.根据权利要求3所述的一种医用抗菌纱布,其特征在于:所述整理液包括重量份数分别为2~5份的羟丙基-β-环糊精,7~8份的柠檬酸,1~3份的磷酸二氢钠和90~110份的水。
4.一种医用抗菌纱布的制备方法,包括以下步骤:步骤一,抗菌剂制备;步骤二,一次抗菌处理;步骤三,混纺处理;步骤四,二次抗菌处理;其特征在于:
其中上述步骤一中,将抗菌剂原料进行粉碎处理,然后加入450~500份的水进行煎煮,煎煮至体积为原来的二十分之一,然后再过滤处理,再向滤渣中加入滤渣重量45~50倍量的体积分数为70~75%的酒精溶液,于40~45℃、30~35kHz超声提取30~40分钟,过滤,合并所有滤液,再蒸发至无酒精状态,然后使用AB-8大孔树脂进行纯化,收集纯化液,冷冻干燥至无水分,安全无毒,制得抗菌剂;
其中上述步骤二中,首先抗菌剂中加水,搅拌均匀,使抗菌剂的质量浓度为0.1~0.3%,得抗菌液,然后将陶瓷纤维浸于抗菌液中,直至完全吸收,再进行冷冻干燥至含水量为0~3%,制得抗菌陶瓷纤维;冷冻干燥,温度为-35~-32℃;
其中上述步骤三中,将棉纤维和抗菌陶瓷纤维进行混纺,得中心纤维;将竹纤维与二分之一的中心纤维进行混纺,使竹纤维包裹中心纤维,得纬纱;将竹纤维、壳聚糖纤维与中心纤维进行混纺,使壳聚糖纤维包裹粗中心纤维,得经纱;将经纱和纬纱进行纺织,制得一次抗菌处理的医用抗菌纱布;
其中上述步骤四中,将步骤三中制得的医用抗菌纱布置于整理液中进行浸轧处理,然后进行蒸汽交联,再水洗后得到羟丙基-β-环糊精修饰的纱布,然后将修饰后的纱布浸渍于氧化石墨烯分散液中,加热反应,取出后水洗得到石墨烯修饰的纱布,再经过冷风干燥得到二次抗菌处理的医用抗菌纱布。
5.根据权利要求4所述的一种医用抗菌纱布的制备方法,其特征在于:所述步骤四中,浸轧处理后纱布的带液率为100~110%,蒸汽交联温度140~160℃,蒸汽交联时间3~5min。
6.根据权利要求4所述的一种医用抗菌纱布的制备方法,其特征在于:所述步骤四中,所述氧化石墨烯分散液中氧化石墨烯的浓度为1~3mg/mL,添加的抗坏血酸与氧化石墨烯的质量比为0.5~10:1。
7.根据权利要求4所述的一种医用抗菌纱布的制备方法,其特征在于:所述步骤四中,加热反应温度为60~80℃,反应时间为2~3h。
8.根据权利要求4所述的一种医用抗菌纱布的制备方法,其特征在于:所述步骤四中,冷风干燥温度为6~8℃。
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