CN112195650A - 羟基酯化络合抗菌纤维、制备方法及应用 - Google Patents
羟基酯化络合抗菌纤维、制备方法及应用 Download PDFInfo
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- CN112195650A CN112195650A CN202011167585.8A CN202011167585A CN112195650A CN 112195650 A CN112195650 A CN 112195650A CN 202011167585 A CN202011167585 A CN 202011167585A CN 112195650 A CN112195650 A CN 112195650A
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Abstract
本发明涉及纺织品领域,尤其涉及一种抗菌纤维。一种羟基酯化络合抗菌纤维制备方法,选取纤维上含有羟基的纤维作为待改性原料,交联反应,双功能交联剂至少含有一个羧基活性基团与羟基发生酯化反应,交联剂还至少另含有一个络合活性基团与抗菌金属离子发生络合反应;交联剂洗涤;络合反应,得到抗菌纤维。本发明利用纤维上的羟基官能团与双功能交联剂进行酯化反应后,再利用金属离子络合活性基团络合抗菌金属离子,利用双向的共价键在纤维表面接枝抗菌金属离子,最终得到的抗菌纤维产物。该法制备的抗菌纤维具有物理性质好,抗菌有效期长,无有毒有害物质溶出,耐洗涤性高的优点;同时,工艺过程简单,成本低,特别适合推广应用到大规模工业生产中。
Description
技术领域
本发明涉及纺织品领域,尤其涉及一种抗菌纤维。
背景技术
随着社会经济的发展和人民生活水平的提高,人们对纺织品的要求,已从基本的保暖、舒适等要求,上升到希望纺织品同时兼具保健、安全等多功能。许多致病性微生物不仅会引起皮肤感染,分解人体代谢产物产生异味,危害人类身体、心理健康,而且会在人际之间传播,引发传染病,如院内感染。在病原的传播中,纺织品是重要的媒介之一。因而纺织品的抗菌加工技术就应运而生,现有的抗菌纤维一般是靠添加抗菌剂来实现的。抗菌加工方法分为两种:
一种是将抗菌剂加到成纤前的聚合物中,采用共混纺丝来制得抗菌纤维。这种抗菌剂可以是纳米金属及其氧化物,如纳米银、纳米铜、纳米氧化亚铜、纳米氧化锌等,或负载等处理后的纳米材料,如专利“一种十字异型铜抗菌纤维(CN107779981A)”,通过将纳米铜、添加剂和聚酯混合,制得功能性母粒,将母粒与聚酯混合后进行发纺丝。这种方法抗菌耐久性较好,但具有两项相冲突的特征导致实用性不强:一、抗菌性与添加剂含量有关,抗菌添加剂含量越高抗菌性越强,但是抗菌添加剂含量越高,纤维的物理指标会越差,因此添加量不能太大。二、因为抗菌添加剂是在纺丝前添加在母粒中,使得抗菌添加剂在母粒中均匀分布,而实际起到抗菌作用的仅有纺丝后纤维表面位置的添加剂才能起作用,纤维内部的抗菌剂实际上毫无用处,起不到抗菌作用,进一步增加纤维中添加剂的含量,则影响到纤维物理性能。
抗菌加工的另一种方法是使用抗菌剂对纤维进行后加工整理,也就是在纤维成纤纺丝完成后,用抗菌加工整理剂再处理,使抗菌剂与纤维结合,从而使纺织品获得抗菌性能。如发明专利“一种抗菌功能性纤维素纤维的制备方法(CN103422339B)”,该发明利用纤维上的环糊精对抗菌药物进行包合然后接枝到纤维素上制备抗菌纤维素。这种加工方法使用的有机抗菌剂用量少且效果显著,但多数属于溶出性抗菌剂,一经洗涤就会流失,抗菌性能很快丧失,甚至还可能导致过敏等反应,这是标准FZ/T 73023-2006不允许的。后整理法使用无机抗菌剂时,多数是靠涂覆或者范德华力吸附。涂覆的涂层不耐洗涤,而且使纤维和纺织品显得僵硬。范德华力吸附(比如浸渍法,如专利 “HAP掺合银和铜抗菌剂复合涂层的制备方法(CN201410366746.4)”)加工的纺织品结合力不够强,不耐洗涤,较容易在盐存在的情况下脱附而丧失持久抗菌性能,且纤维僵硬,织物柔软度下降。另有中国专利CN108239881A中公开了一种抗菌纤维制备方法,在该方法中虽然采用了中间体(甲基丙烯酸二甲氨基乙酯)接枝方式将纤维与杀菌离子通过化学键连接在一起,解决了涂层式杀菌层不耐洗涤的缺陷;但是中间体一端到的接枝方式为采用辐射高能与纤维端接枝,这种方式不但具有能耗高,接枝率低、经济性差,无法应用于大规模工业生产以外,其中间产物(季胺化纤维产物)还可能具有一定的人体毒性,影响生育和胎儿发育(Toxicol. Sci. 2019,DOI:10.1093/toxsci/kfz139),需要进一步研究观察,不适合直接应用于直接穿戴的纺织品上;同时,中间体另一端通过离子键与高锰酸根结合实现杀菌效果,但是高锰酸根具有很强的氧化性,极易被还原而导致抗菌性流失;并且离子键不耐盐,而汗液和洗涤剂中盐是必然存在的,从而使得该产品的抗菌性有效期不长,另外高锰酸根离子本身带有***,影响后续纺织品的染色过程。
发明内容
本发明所要解决的技术问题是提供一种羟基酯化络合抗菌纤维及制备方法,该方法利用纤维上的羟基官能团与双功能交联剂进行酯化反应后,再利用双功能交联剂上的金属离子络合活性基团络合抗菌金属离子,利用双向的共价键在纤维表面接枝抗菌金属离子,最终得到的抗菌纤维产物,在交联改性前进行染色步骤后,解决了现有技术中抗菌有效期短,不耐洗涤,染色后的纤维织物成品抗菌效果大大降低的缺陷。
本发明是这样实现的:一种羟基酯化络合抗菌纤维制备方法,选取待改性纤维作为原料,所述待改性纤维上含有羟基“-OH”官能团,包括以下步骤:
S1.交联反应,将待改性纤维浸轧于交联剂和催化剂的溶液中,通过酯化反应利用待改性纤维上的羟基“-OH”与交联剂反应得到改性纤维中间体;
所述交联剂至少含有一个羧基活性基团“-COOH”与羟基“-OH”发生酯化反应,同时交联剂还至少另含有一个络合活性基团与抗菌金属离子发生络合反应;
S2.交联剂洗涤,选用交联剂洗涤剂洗涤改性纤维中间体,使得改性纤维中间体充分洗涤除去未反应交联到纤维上的交联剂;
S3.络合反应,将洗涤后的改性纤维中间体浸轧于抗菌金属离子的盐溶液中,进行络合反应,得到抗菌纤维,最后洗涤、干燥得到抗菌纤维成品。
所述交联剂为同时含有A基团与B基团的双功能交联剂,所述A基团选自羧基活性基团“-COOH”,所述B基团选自多羧酸根、羧基羟基、磷酸根、多羧酸、多羧基羟基、多磷酸,或以上基团的盐中的一种或多种;
所述待改性纤维为纤维素纤维或蛋白质纤维。
所述纤维素纤维包括棉、麻、再生纤维素基纤维。
所述蛋白质纤维包括兽毛、蚕丝、羽绒、再生蛋白纤维。
所述步骤S1之间前还包括染色步骤,选用偶氮苯磺酸盐类或蒽醌类染色剂对待改性纤维进行染色。
所述染色剂选择直接冻黄g或对氯磺酸蒽醌;染色采用轧染工艺,将织物在染液中经过短暂的浸渍后,随即用压辊轧压,将染液挤入纺织品的组织空隙中,并除去多余染液,使染料均匀分布在织物上,然后通过汽蒸过程进行固色处理,汽蒸温度80℃。
所述步骤S2中使用的交联剂洗涤剂为质量百分比浓度为0.001%~1%的十二烷基磺酸盐和硫酸钠的混合水溶液,所述混合水溶液中十二烷基磺酸盐与硫酸钠的质量比为10:1~1:1。
所述交联剂和催化剂的溶液质量百分比浓度为1%~10%;其中,交联剂与催化剂的质量比为1:1~10:1;所述交联反应的条件是:反应时间1min~60min;反应温度20~90℃。
所述催化剂选自磷酸、硼酸、磺酸、甲基苯磺酸。
所述抗菌金属离子选自Ag+、Cu2+、Zn2+或其中任意一种或多种的任意比例混合。
所述抗菌金属离子的质量为抗菌纤维成品干重的0.1%~30%。
所述步骤S3中的洗涤方式为使用清水进行浸轧洗涤或逆流洗涤,所述洗涤水用量为,水:抗菌纤维的体积比40:1~2:1;洗涤时间为30~50min;所述干燥时间为15~60min,温度为35℃~80℃的热风吹干。
一种上述方法所制得的羟基酯化络合抗菌纤维。
一种羟基酯化络合抗菌纤维的应用,将羟基酯化络合抗菌纤维应用在纺织品上。
本发明羟基酯化络合抗菌纤维及制备方法利用纤维上的羟基官能团与双功能交联剂进行酯化反应后,再利用双功能交联剂上的金属离子络合活性基团络合抗菌金属离子,利用双向的共价键在纤维表面接枝抗菌金属离子,最终得到的抗菌纤维产物;同时,为了提升商业价值,还可以在交联改性前先进行染色的步骤,使得该抗菌纤维产物具有物理性质好,抗菌有效期长,无有毒有害物质溶出,耐洗涤性高的优点;同时,工艺过程简单,成本低,特别适合推广应用到大规模工业生产中。
附图说明
图1为本发明中纤维素纤维基本结构示意图;
图2为本发明中蛋白质纤维基本结构示意图;
图3本发明中纤维与双功能交联剂发生酯化反应的机理示意图;
图4为本发明羟基酯化络合抗菌纤维及制备方法中所使用的双功能交联剂分子结构示意图
图中:括号中的基团代表-(R0)i-H,R0代表亚甲基-CH2-、烯基团-CH=CH-、芳香基团,或以上基团的N、P、卤素、硝基取代基团;
R代指双功能交联剂上除-COOH以外的其它基团、R´代指纤维上糖单元其余基团、R”代指蛋白质肽链侧基团;
i=0~20的自然数;k指代聚合度,其值为20~200000之间自然数。
具体实施方式
下面结合具体实施例,进一步阐述本发明。应理解,这些实施例仅用于说明本发明而不用于限制本发明的范围。此外应理解,在阅读了本发明表述的内容之后,本领域技术人员可以对本发明作各种改动或修改,这些等价形式同样落于本申请所附权利要求书所限定的范围。
实施例
在本说明书中,除非另有说明,所有份数都是重量份。
一种羟基酯化络合抗菌纤维制备方法,选取待改性纤维作为原料,所述待改性纤维上含有羟基“-OH”官能团,以便于进行酯化反应;所述待改性纤维为纤维素纤维或蛋白质纤维。
如图1所示,在本发明中,纤维素纤维可分为天然纤维素纤维如棉、麻类和再生纤维素基纤维如Lyocell、Modal纤维、竹纤维、铜氨纤维等。这类纤维主要是由纤维素组成,纤维素(cellulose)是由葡萄糖组成的大分子多糖,不溶于水及一般有机溶剂,每个D-吡喃式葡萄糖的2,3,6位都有活性羟基,可作为酯化反应的活性位点。
如图2所示,在本发明中,蛋白质纤维,主要包括天然蛋白纤维如蚕丝、兽毛、羽绒等,以及再生蛋白纤维,如大豆蛋白纤维、花生蛋白纤维、牛奶蛋白纤维等。多数蛋白质由20种基本氨基酸(NH2-CHR-COOH)经肽键缩合而成,氨基酸主链接近,差异主要在于侧链基团,不同来源蛋白中各氨基酸的种类和数量不完全一致甚至差异很大。蛋白质主链均是肽键连接,因蛋白纤维上含有羟基活性基团“-OH”,可作为酯化反应的活性位点。
包括以下步骤:
S1.如图3所示的交联反应,将待改性纤维浸轧于交联剂和催化剂的溶液中,通过酯化反应利用待改性纤维上的羟基“-OH”与交联剂反应得到改性纤维中间体;
所述交联剂至少含有一个羧基活性基团“-COOH”与羟基“-OH”发生酯化反应,同时交联剂还至少另含有一个络合活性基团与抗菌金属离子发生络合反应;
在本发明中,所述交联剂为同时含有A基团与B基团的双功能交联剂,所述A基团选自羧基活性基团“-COOH”;这是因为需要交联剂上至少一个羧基活性基团“-COOH”通过共价键与待改性纤维的羟基“-OH”发生酯化反应通过共价键结合
所述B基团为络合活性基团,选自多羧酸根、羧基羟基、多磷酸根、多羧酸、多羧基羟基、多磷酸,或以上基团的盐中的一种或多种;络合活性基团用于与抗菌金属离子配位络合,以提高抗菌金属离子附着在纤维素纤维上的牢固性,实现长效、抗洗涤的抗菌能力;
如图4所示,本发明中的交联剂选自多羧酸及其盐类(I)、多磷酸及其盐类(II)、羟基羧酸及其盐类(III)、羧酸膦酸及其盐类(IV);在本实施例中,作为优选,所述交联剂选自:柠檬酸、1,2,3,4-丁烷四羧酸、乙二胺四乙酸、2-羟基丙烷-1,2,3-三羧酸、2-膦酸丁烷-1,2,4-三羧酸、2-膦酰基-2-(膦酰基甲基)戊二酸、1,1-二磷酸-乙醇、巯基丁二酸;以上这些物质都含有羧基活性基团“-COOH”,另外还带有金属离子络合活性基团,以满足双功能交联剂的要求。
在本发明中,所用的催化剂与交联剂相配合,在本实施例中,所述催化剂选自磷酸、硼酸、磺酸、甲基苯磺酸,所述交联剂和催化剂的溶液质量百分比浓度为1%~10%;
其中,交联剂与催化剂的质量比为1:1~10:1;所述交联反应的条件是:反应时间1min~60min;反应温度20~90℃;反应环境为水热反应、微波反应、超声反应等。
S2. 交联剂洗涤,选用交联剂洗涤剂洗涤改性纤维中间体,使得改性纤维中间体充分洗涤除去未反应交联到纤维上的交联剂;
这是因为未反应的交联剂也会络合金属离子,这部分未被交联上的交联剂即使可以络合金属离子,但将会被洗涤带出,既影响后续络合反应的效率,也影响处理后抗菌纤维抗菌性能的耐久性。因而需要将改性纤维中间体用交联剂洗涤剂清洁干净后再进行络合反应,因此交联剂洗涤剂的选用与交联剂有关。
在本发明中,所述交联剂洗涤剂通常包括表面活性剂C与助剂D混合而成;所述表面活性剂C选自磺酸盐类、硫酸盐类、苯磺酸盐类阴离子表面活性剂;聚氧乙烯醚类、烷醇酰胺类非离子表面活性剂;甜菜碱两性表面活性剂;所述助剂D选自三聚磷酸钠、硅酸钠、硫酸钠或碳酸钠;所述助剂D的选用与表面活性剂C相配合;在本实施例中,作为优选,所述交联剂洗涤剂为质量百分比浓度为0.001%~1%的十二烷基磺酸盐和硫酸钠的混合水溶液,所述混合水溶液中十二烷基磺酸盐与硫酸钠的质量比为10:1~1:1,优选比例为4:1。
S3.络合反应,将洗涤后的改性纤维中间体浸轧于抗菌金属离子的盐溶液中,进行络合反应,得到抗菌纤维,最后洗涤、干燥得到抗菌纤维成品;通常抗菌金属离子的盐溶液选自硫酸铜水溶液、硫酸锌水溶液、氯化锌水溶液、硝酸银水溶液等。
在本实施例中,所述抗菌金属离子选自Ag+、Cu2+、Zn2+或其中任意一种或多种的任意比例混合,抗菌金属离子的质量为抗菌纤维成品干重的0.1%~30%。
络合反应后的洗涤方式优选为,使用清水进行浸轧洗涤或逆流洗涤,所述洗涤水用量为,水:抗菌纤维素纤维的体积比40:1~2:1;洗涤时间为30~50min;所述干燥时间为15~60min,温度为35℃~80℃的热风吹干。
本发明需要特别说明的是,考虑到成品的实际商用性,成品纤维一般不会直接采用原色制作各类纺织品,必然需要对纤维进行染色,而成品络合后的纤维再进行染色时,某些染料会破坏络合的抗菌金属离子抗菌性,而有些染色后的染料本身会覆盖住抗菌金属离子等等原因最终都会使得染色工艺可能影响到已经络合抗菌金属离子的纤维的抗菌性能,因此在本发明中,所述步骤S1之前还包括染色步骤,选用偶氮苯磺酸盐(直接冻黄G)类或蒽醌类类染色剂对预处理纤维进行染色。
在本实施例中,作为优选,所述染色剂选择直接冻黄g或对氯磺酸蒽醌;染色步骤中的染色采用轧染工艺,将预处理纤维浸轧于染色剂溶液中,浸泡10~60分钟后烘干,再汽蒸1~10分钟后,洗净、冷却至室温。
通过选用合适的染色剂,并控制染色工艺的参数,使得纤维能够被顺利上色且不会影响到后续的交联反应,以提高本发明羟基酯化络合抗菌纤维素纤维的商业价值。
本发明中的羟基酯化络合抗菌纤维的应用,可以单独或与其他纤维一起混纺应用在纺织品上。
实施例1~5为利用上述方法制备所得到的羟基酯化络合抗菌纤维:
下表1为实施例1~5中分别采用具体的参数,表2为所采用交联剂的分子结构:
表1
表2
将实施例3所得的羟基酯化络合抗菌纤维纺织成毛巾大小的织物后进行如下抗菌实验:
抗菌物质溶出性测试:洗涤程序:根据FZ/T73023-2006抗菌针织品附录C.3标准化洗涤条件及程序进行1次洗涤后,抗菌织物中的抗菌物质的溶出性测试,结果如表3所示:检测要求:安全性试验(抑菌圈法)检测方法:安全性试验:FZ/T73023-2006抗菌针织品附录E抗菌物质的溶出性测试方法
检测菌种 | 大肠杆菌8099 | 金黄色葡萄球菌ATCC6538 | 白色念珠菌ATCC10231 |
培养时间(小时) | 18h | 18h | 48h |
抑菌圈宽度D(mm) | 0 | 0 | 0 |
表3为抗菌织物中的抗菌物质的溶出性测试结果
抗菌测试:
洗涤程序:根据FZ/T73023-2006抗菌针织品附录C.4简化洗涤条件及程序进行50次(10个完整洗涤循环)洗涤后的抗菌效果试验结果,如表4所示:检测要求:抗菌效果试验检测方法:抗菌效果试验:FZ/T73023-2006抗菌针织品附录D.8抗菌织物测试方法:振荡法
表4洗涤后的抗菌效果试验结果
备注: 标准空白样为100%纯棉布,样品灭菌方式为高压蒸汽灭菌(121℃,15min)。
Claims (17)
1.一种羟基酯化络合抗菌纤维制备方法,其特征是,选取待改性纤维作为原料,所述待改性纤维上含有羟基“-OH”官能团,包括以下步骤:
S1.交联反应,将待改性纤维浸轧于交联剂和催化剂的溶液中,通过酯化反应利用待改性纤维上的羟基“-OH”与交联剂反应得到改性纤维中间体;
所述交联剂至少含有一个羧基活性基团“-COOH”与羟基“-OH”发生酯化反应,同时交联剂还至少另含有一个络合活性基团与抗菌金属离子发生络合反应;
S2.交联剂洗涤,选用交联剂洗涤剂洗涤改性纤维中间体,使得改性纤维中间体充分洗涤除去未反应交联到纤维上的交联剂;
S3.络合反应,将洗涤后的改性纤维中间体浸轧于抗菌金属离子的盐溶液中,进行络合反应,得到抗菌纤维,最后洗涤、干燥得到抗菌纤维成品。
2.如权利要求1所述的羟基酯化络合抗菌纤维制备方法,其特征是:所述交联剂为同时含有A基团与B基团的双功能交联剂,所述A基团选自羧基活性基团“-COOH”,所述B基团选自多羧酸根、羧基羟基、多磷酸根、多羧酸、多羧基羟基、多磷酸,或以上基团的盐中的一种或多种。
3.如权利要求2所述的羟基酯化络合抗菌纤维制备方法,其特征是:所述待改性纤维为纤维素纤维或蛋白质纤维。
4.如权利要求3所述的羟基酯化络合抗菌纤维制备方法,其特征是:所述纤维素纤维包括棉、麻、再生纤维素基纤维。
5.如权利要求3所述的羟基酯化络合抗菌纤维制备方法,其特征是:所述蛋白质纤维包括兽毛、蚕丝、羽绒、再生蛋白纤维。
6.如权利要求1~5中任意一权利要求所述的羟基酯化络合抗菌纤维制备方法,其特征是:所述步骤S1之间前还包括染色步骤,选用偶氮苯磺酸盐类或蒽醌类染色剂对待改性纤维进行染色。
7.如权利要求6所述的羟基酯化络合抗菌纤维制备方法,其特征是:所述染色剂选择直接冻黄g或对氯磺酸蒽醌;染色采用轧染工艺,将织物在染液中经过短暂的浸渍后,随即用压辊轧压,将染液挤入纺织品的组织空隙中,并除去多余染液,使染料均匀分布在织物上,然后通过汽蒸过程进行固色处理,汽蒸温度80℃。
8.如权利要求6所述的羟基酯化络合抗菌纤维制备方法,其特征是:所述步骤S2中使用的交联剂洗涤剂为质量百分比浓度为0.001%~1%的十二烷基磺酸盐和硫酸钠的混合水溶液,所述混合水溶液中十二烷基磺酸盐与硫酸钠的质量比为10:1~1:1。
9.如权利要求6所述的羟基酯化络合抗菌纤维制备方法,其特征是:所述交联剂和催化剂的溶液质量百分比浓度为1%~10%;其中,交联剂与催化剂的质量比为1:1~10:1;所述交联反应的条件是:反应时间1min~60min;反应温度20~90℃。
10.如权利要求6所述的羟基酯化络合抗菌纤维制备方法,其特征是:所述催化剂选自磷酸、硼酸、磺酸、甲基苯磺酸。
11.如权利要求6所述的羟基酯化络合抗菌纤维制备方法,其特征是:所述抗菌金属离子选自Ag+、Cu2+、Zn2+或其中任意一种或多种的任意比例混合。
12.如权利要求11所述的羟基酯化络合抗菌纤维制备方法,其特征是:所述抗菌金属离子的质量为抗菌纤维成品干重的0.1%~30%。
13.如权利要求6所述的羟基酯化络合抗菌纤维制备方法,其特征是:所述步骤S3中的洗涤方式为使用清水进行浸轧洗涤或逆流洗涤,所述洗涤水用量为,水:抗菌纤维的体积比40:1~2:1;洗涤时间为30~50min;所述干燥时间为15~60min,温度为35℃~80℃的热风吹干。
14.一种如权利要求1~5中任意一权利要求所述的制备方法所制得的羟基酯化络合抗菌纤维。
15.一种如权利要求14所述的羟基酯化络合抗菌纤维的应用,其特征是:将羟基酯化络合抗菌纤维应用在纺织品上。
16.一种如权利要求6所述的制备方法所制得的羟基酯化络合抗菌纤维。
17.一种如权利要求16所述的羟基酯化络合抗菌纤维的应用,其特征是:将羟基酯化络合抗菌纤维应用在纺织品上。
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