CN106555334B - 一种亚麻短纤维的化学改性方法 - Google Patents
一种亚麻短纤维的化学改性方法 Download PDFInfo
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Abstract
本发明公开了一种亚麻短纤维的化学改性方法,该方法以亚麻短纤维为原料,首先使用废碱循环复煮法进行前处理,然后采用高碘酸钠对其进行选择性氧化、丙三醇溶液浸泡、去离子水洗涤、脱水、烘干工序加工而成。该方法可以提高亚麻短纤维的分裂度、白度、可纺性,使短纤维变得柔软,且抗折皱性提高。改性后的亚麻短纤维醛基含量216.67~233.58 umol/g,O’KI红外结晶指数0.8285~0.8374,分裂度1225~1262 Nm,断裂强度7.64~8.40cN·tex‑1,伸长率4.97~5.46%,白度72.11~75.03%,满足圆机纬编汗布用亚麻纱生产的技术要求,亚麻短纤维的加工范围扩大。
Description
技术领域
本发明涉及一种亚麻短纤维的化学改性方法,属于纺织技术领域。
背景技术
亚麻短纤维是栉梳机梳理打成麻的过程中产生的机器短麻,其杂质含量高,可纺性差,但其数量却比全部纺纱原料的一半还要高,且相对于长麻而言,短麻的价格低廉。合理有效的利用亚麻短纤维,可节约成本,可利用的价值空间大。
本发明首先使用废碱循环复煮法对亚麻短纤维进行前处理,除去部分果胶、木质素等杂质。然后采用高碘酸钠对煮练后的亚麻短纤维进行选择性氧化,在短纤维的纤维素大分子上引入醛基,达到改性的目的。利用醛基还可以将其转变为其它的官能团,使亚麻短纤维具有新用途和新功能。同时,未氧化亚麻短纤维的O’KI红外结晶指数为0.9048,氧化改性后亚麻短纤维的O’KI红外结晶指数为0.8285~0.8374,说明结晶度降低,无定形区增大,有利于化学试剂和染料向纤维的内部渗透及扩散,改善染色性能和后续的加工性能。此外,改性后的亚麻短纤维其分裂度等综合性能指标改善,满足棉纺设备上的纺纱技术要求。据调查,采用此加工方法,由亚麻短纤维制成适合针织圆机纬编汗布用纱目前国内外资料未见报道。
发明内容
本发明要解决的技术问题在于提供一种亚麻短纤维的化学改性方法。该方法可以很好地对亚麻短纤维进行选择性氧化,显著提高其分裂度、白度、可纺性,使亚麻短纤维变得柔软,且抗折皱性提高。改性后的亚麻短纤维醛基含量216.67~233.58 umol/g,O’KI红外结晶指数0.8285~0.8374,分裂度1225~1262 Nm,断裂强度7.64~8.40cN·tex-1,伸长率4.97~5.46%,白度72.11~75.03%,满足圆机纬编汗布用亚麻纱生产的技术要求,提高亚麻短纤维的加工性能。
本发明的技术方案是:以亚麻短纤维为原料,首先使用废碱循环复煮法进行前处理,然后采用高碘酸钠对其选择性氧化、丙三醇溶液浸泡、去离子水洗涤、脱水、烘干工序加工而成,具体工艺流程如下:
(1) 废碱循环复煮前处理:碳酸钠6.0 g/L,亚硫酸钠3.0 g/L,尿素 8.0 g/L,温度90~95℃,时间 50~60 min,浴比1:30,循环煮练;
(2)温水洗:35~45℃;净洗至pH为7.0~7.2;
(3)高碘酸钠氧化:高碘酸钠4.0~5.0 g/L,温度35~45℃,时间30~40 min,浴比1:30,避光浸泡;
(4)丙三醇溶液浸泡:0.10~0.15 mol/L ,温度20~25℃,时间25~35 min;
(5)去离子水洗涤:温度20~30℃,充分水洗;
(6) 脱水;
(7) 烘干:90~95℃至恒重。
上述第(1)步骤的废碱循环复煮法是将第一次煮练后的废液用于第二次煮练工艺的预煮处理中去,二次碱煮的废液再循环到下一个亚麻短纤维处理中去,如此循环,原则就是脏水煮赃物,净水煮净物。这样避免了亚麻短纤维煮练中的高能耗,减少了试剂成本,且达到部分果胶及木质素等杂质的去除目的。在废液循环煮练中加入尿素可以充分润湿、溶胀纤维,提高煮练效果,使亚麻短纤维的物理化学性能指标优化,提高分裂度和成纱质量等级,可纺性得以改善。然后通过步骤(2)将短纤维洗净。
上述第(3)步骤的高碘酸钠氧化,高碘酸钠是一种强氧化剂,其对亚麻短纤维的氧化是具有选择性的,它可以将纤维素分子葡萄糖环上的邻羟基氧化成两个醛基,而伯羟基却不发生反应。值得注意的是此步骤需要严格控制高碘酸钠的浓度、温度和时间,否则IO4 -离子使短纤维的氧化程度加深,降解程度和失重率过大,反而使其综合性能下降。经过合理氧化处理后的亚麻短纤维结晶度降低,对纤维的强度、尺寸稳定性、保水性以及化学反应性等都有影响,其物理和化学性质有决定性的改变。因此,对后续的加工有实际意义。此外,高碘酸钠作为一种氧化剂还能破坏色素中的共轭体系,使之消色,达到漂白的目的,在亚麻短纤维加工过程中可以省略漂白工序。
上述第(4)步骤工序中,将亚麻短纤维浸泡在丙三醇溶液中,主要是除去没有反应的高碘酸钠。
上述第(5)步骤工序中,去离子水能防止水中的钙、镁等金属离子与酸根离子结合形成不溶性的盐沉积在短纤维上,并促进清洗过程中杂质的去除,提高手感和白度,提高水洗的综合效果。
改性后的亚麻短纤维醛基含量216.67~233.58 umol/g,O’KI红外结晶指数0.8285~0.8374,分裂度1225~1262 Nm,断裂强度7.64~8.40cN·tex-1,伸长率4.97~5.46%,白度72.11~75.03%,满足圆机纬编汗布用亚麻纱生产的技术要求,提高亚麻短纤维的加工性能。
本发明的有益效果是:采用环保型废碱循环复煮法去除亚麻短纤维中部分果胶和木质素等杂质,不会造成废水污染,且加工条件相对温和,弥补了传统工艺中强碱和高温使纤维强力损伤大的问题。采用高碘酸钠对煮练后的亚麻短纤维进行选择性氧化,在纤维素大分子上引入醛基,达到改性的目的。利用醛基还可以将其转变为其它的官能团,使亚麻短纤维具有新用途和新功能。经过氧化处理后的亚麻短纤维结晶度降低,纤维的无定形区增大,有利于化学试剂和染料向纤维的内部渗透及扩散,改善染色性能和后续的加工性能。该加工方法对基础设施和设备无特殊要求,可以利用原有配套工程,操作简单,成本低廉。改性后的短纤维洁白、柔软,分裂度高,可纺性好,成纱质量提高,满足圆机纬编汗布用亚麻纱生产的技术要求。
具体实施方式
实施例1
本发明的工艺流程:
(1) 废碱循环复煮前处理:碳酸钠6.0 g/L,亚硫酸钠 3.0 g/L,尿素 8.0 g/L,温度95℃,时间 50min,浴比1:30,循环煮练;
(2)温水洗:35℃;净洗至pH为7.0~7.2;
(3) 高碘酸钠氧化:高碘酸钠4.0g/L,温度35℃,时间30min,浴比 1:30,避光浸泡;
(4) 丙三醇溶液浸泡:0.10 mol/L ,温度20℃,时间25 min;
(5) 去离子水洗涤:20~30℃,充分水洗;
(6) 脱水;
(7) 烘干:90~95℃至恒重。
改性后的亚麻短纤维醛基含量216.67 umol/g,O’KI红外结晶指数0.8293,分裂度1259 Nm,断裂强度7.89 cN·tex-1,伸长率5.03 %,白度73.15 % 。
实施例2
本发明的工艺流程:
(1) 废碱循环复煮前处理:碳酸钠6.0 g/L,亚硫酸钠3.0 g/L,尿素 8.0 g/L,温度95℃,时间 55 min,浴比1:30,循环煮练;
(2)温水洗:35℃;净洗至pH为7.0~7.2;
(3) 高碘酸钠氧化:高碘酸钠4.5g/L,温度40℃,时间30min,浴比 1:30,避光浸泡;
(4) 丙三醇溶液浸泡:0.12mol/L ,温度20℃,时间25min;
(5)去离子水洗涤:温度20~30℃,充分水洗;
(6) 脱水;
(7) 烘干:90~95℃至恒重。
改性后的亚麻短纤维醛基含量223.41 umol/g,O’KI红外结晶指数0.8351,分裂度1248 Nm,断裂强度7.72 cN·tex-1,伸长率5.43 %,白度74.71 % 。
实施例3
本发明的工艺流程:
(1) 废碱循环复煮前处理:碳酸钠6.0 g/L,亚硫酸钠3.0 g/L,尿素 8.0 g/L,温度90℃,时间 55 min,浴比1:30,循环煮练;
(2)温水洗:40℃;净洗至pH为7.0~7.2;
(3) 高碘酸钠氧化:高碘酸钠4.5g/L,温度40℃,时间35 min,浴比 1:30,避光浸泡;
(4) 丙三醇溶液浸泡:0.15 mol/L ,温度22℃,时间30min;
(5) 去离子水洗涤:温度20~30℃,充分水洗;
(6) 脱水;
(7) 烘干:90~95℃至恒重。
改性后的亚麻短纤维醛基含量230.55 umol/g,O’KI红外结晶指数0.8362,分裂度1257 Nm,断裂强度8.03 cN·tex-1,伸长率4.99 %,白度74.96 % 。
实施例4
本发明的工艺流程:
(1) 废碱循环复煮前处理:碳酸钠6.0 g/L,亚硫酸钠3.0 g/L,尿素 8.0 g/L,温度90℃,时间 60 min,浴比1:30,循环煮练;
(2)温水洗:40℃;净洗至pH为7.0~7.2;
(3) 高碘酸钠氧化:高碘酸钠5.0 g/L,温度35℃,时间30 min,浴比 1:30,避光浸泡;
(4) 丙三醇溶液浸泡:0.15 mol/L ,温度25℃,时间30 min;
(5)去离子水洗涤:温度20~30℃,充分水洗;
(6) 脱水;
(7) 烘干:90~95℃至恒重。
改性后的亚麻短纤维醛基含量228.75 umol/g,O’KI红外结晶指数0.8346,分裂度1254 Nm,断裂强度7.92 cN·tex-1,伸长率5.16 %,白度74.82 % 。
实施例5
本发明的工艺流程:
(1) 废碱循环复煮前处理:碳酸钠6.0 g/L,亚硫酸钠3.0 g/L,尿素 8.0 g/L,温度95℃,时间 50 min,浴比1:30,循环煮练;
(2)温水洗:45℃;净洗至pH为7.0~7.2;
(3) 高碘酸钠氧化:高碘酸钠5.0 g/L,温度35℃,时间40 min,浴比 1:30,避光浸泡;
(4) 丙三醇溶液浸泡:0.15 mol/L ,温度25℃,时间35 min;
(5)去离子水洗涤:温度20~30℃,充分水洗;
(6) 脱水;
(7) 烘干:90~95℃至恒重。
改性后的亚麻短纤维醛基含量231.22 umol/g,O’KI红外结晶指数0.8337,分裂度1239 Nm,断裂强度7.85 cN·tex-1,伸长率5.26 %,白度73.97 % 。
实施例6
本发明的工艺流程:
(1) 废碱循环复煮前处理:碳酸钠6.0 g/L,亚硫酸钠3.0 g/L,尿素 8.0 g/L,温度90℃,时间 60 min,浴比1:30,循环煮练;
(2)温水洗:45℃;净洗至pH为7.0~7.2;
(3) 高碘酸钠氧化:高碘酸钠4.0g/L,温度45℃,时间30min,浴比 1:30,避光浸泡;
(4) 丙三醇溶液浸泡:0.10 mol/L ,温度25℃,时间35 min;
(5)去离子水洗涤:温度20~30℃,充分水洗;
(6) 脱水
(7) 烘干:90~95℃至恒重。
改性后的亚麻短纤维醛基含量227.58 umol/g,O’KI红外结晶指数0.8329,分裂度1262 Nm,断裂强度7.64 cN·tex-1,伸长率5.46 %,白度75.01 % 。
实施例7
本发明的工艺流程:
(1) 废碱循环复煮前处理:碳酸钠6.0 g/L,亚硫酸钠3.0 g/L,尿素 8.0 g/L,温度95℃,时间 60 min,浴比1:30,循环煮练;
(2)温水洗:45℃;净洗至pH为7.0~7.2;
(3) 高碘酸钠氧化:高碘酸钠4.5g/L,温度40℃,时间35 min,浴比 1:30,避光浸泡;
(4) 丙三醇溶液浸泡:0.10 mol/L ,温度25℃,时间35 min;
(5)去离子水洗涤:温度20~30℃,充分水洗;
(6) 脱水
(7) 烘干:90~95℃至恒重。
改性后的亚麻短纤维醛基含量232.34 umol/g,O’KI红外结晶指数0.8374,分裂度1244 Nm,断裂强度8.16 cN·tex-1,伸长率5.01 %,白度73.66 % 。
Claims (1)
1.一种亚麻短纤维的化学改性方法,其特征在于:以亚麻短纤维为原料,首先使用废碱循环复煮法进行前处理,然后采用高碘酸钠对其进行选择性氧化、丙三醇溶液浸泡、去离子水洗涤、脱水、烘干工序加工而成,具体工艺流程如下:
(1)废碱循环复煮前处理:碳酸钠6.0 g/L,亚硫酸钠 3.0 g/L,尿素 8.0 g/L,温度90~95℃,时间 50~60 min,浴比1:30,循环煮练;
(2)温水洗:35~45℃;净洗至pH为7.0~7.2;
(3)高碘酸钠氧化:高碘酸钠4.0~5.0 g/L,温度35~45℃,时间30~40 min,浴比 1:30,避光浸泡;
(4)丙三醇溶液浸泡:0.10~0.15 mol/L ,温度20~25℃,
时间25~35 min;
(5)去离子水洗涤:温度20~30℃,充分水洗;
(6) 脱水;
(7) 烘干:90~95℃至恒重。
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