CN110747662A - 一种天然染料染色方法 - Google Patents

一种天然染料染色方法 Download PDF

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CN110747662A
CN110747662A CN201910891591.9A CN201910891591A CN110747662A CN 110747662 A CN110747662 A CN 110747662A CN 201910891591 A CN201910891591 A CN 201910891591A CN 110747662 A CN110747662 A CN 110747662A
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Abstract

本发明公开一种天然染料染色方法,包括:步骤1):采用天然染料对织物进行染色,天然染料用量为0.5‑5%(o.m.f),浴比1:20‑40,染色温度50‑80℃,染色结束后,自然晾干,备用;步骤2):将媒染剂溶于去离子水中,调节pH值3‑4,加入中性电解质,完全溶解;步骤3):将经步骤(1)染色织物浸入媒染浴中,浴比1:5‑1:8,20‑25℃媒染温度下处理45‑90min后,加去离子水稀释至浴比1:30‑1:40;然后升温至50‑60℃,处理后,织物经0.5%草酸溶液漂洗后,再用水洗,自然晾干。在低碱度、较低温度和pH下,进行媒染处理,在媒染后期,通过提高pH、升温、加水稀释等方式,使水合金属离子水解、配聚作用增大,使金属络合物分子变大,促进金属络合物与天然染料、纤维的结合,提高天然染料的染色牢度。

Description

一种天然染料染色方法
技术领域
本发明属于纺织技术领域,特别涉及一种天然染料染色方法。
背景技术
天然染料是从植物、动物、矿物和微生物等原料中提取的染料,它不仅可给纺织品着色,而且在着色的同时可赋予纺织品其他附加功能,如抗菌、抗紫外,因此,深受人们的喜爱。
天然染料染色织物由于色牢度较差,通常需要进行媒染处理。其基本原理为:金属媒染剂在合适的条件下可与天然染料形成络合物,从而提高其水洗牢度。众所周知,固体金属盐溶于水,绝大多数金属离子首先与水分子形成水合离子,水合金属离子在溶液中会发生反应,给出H+,使水合金属离子带正电荷降低。如铬离子在水溶液中会发生如下水解反应:
Figure 111165DEST_PATH_IMAGE001
除此之外,水合金属离子在水解的同时,还会发生配聚作用,例如铬离子会发生如下配聚反应:
从而将单核的水合配离子或水合羟配离子联接起来,形成二核或多核的较大配离子,使分子变大、电荷升高。
传统天然染料媒染并未考虑金属离子在溶液中的水解、配聚作用,通常是在较高的温度,较大的浴比下进行,因此,染色效果不理想。
发明内容
为了解决上述问题,本发明公开了一种天然染料染色方法。
本发明的技术方案为:一种天然染料染色方法,包括下列步骤:
步骤1):采用天然染料对织物进行染色,天然染料用量为0.5-5%(o.m.f),浴比1:20-40,染色温度50-80℃,染色时间30-45min,染色结束后,织物经水洗3-5次,自然晾干,备用;
步骤2):将媒染剂溶于去离子水中,调节pH值3-4,加入中性电解质,待其完全溶解后,备用;
步骤3):将经步骤(1)染色织物浸入媒染浴中,浴比1:5-1:8,20-25℃媒染温度下处理45-90min后,加去离子水稀释至浴比1:30-1:40;然后升温至50-60℃,处理30-60min后,用小苏打调节溶液pH值至6-7,保温10-15min后,取出织物,经0.5%草酸溶液漂洗后,再用水洗3-5次,自然晾干,即可。
进一步地,步骤(1)中的天然染料为姜黄色素、板栗壳色素、栀子黄色素、苏木色素、紫胶色素中的一种或几种。
进一步地,步骤(1)中的织物为真丝织物、羊毛织物或丝/毛混纺织物。
进一步地,步骤(2)中的媒染浴组成为:媒染剂用量2-4%(o.m.f), pH值用甲酸调节;中性电解质5-10g/L;其中:媒染剂为:二价铁盐、三价铁盐、三价铝盐、二价锌盐、四价钛盐中的一种;中性电解质为无水硫酸钠或氯化钠。
本发明首先在较低pH、较低温度、较小浴比条件下对织物进行媒染处理,在此条件下,水合金属离子水解、配聚反应发生的较少,水合金属离子尺寸较小,利于媒染剂向纤维内部的渗透;在媒染后期,通过加水稀释、升温、加碱,促进金属离子配聚反应的发生,使金属络合物分子变大,有利于天然染料牢度提高。通过在媒染浴中添加中性电解质,中性电解质在溶液中电离的阴离子可进入金属络合物内界,取代部分不稳定的水分子,使金属络合物带的正电荷降低(反应如下),有利于金属络合物向纤维内部的渗透。
Figure 507698DEST_PATH_IMAGE004
此外,用于调节PH值的甲酸,在溶液中可电离出HCOO-,它也可进入金属络合物内界,取代部分不稳定的水分子,使金属络合物带的正电荷降低,反应如下:
Figure 64581DEST_PATH_IMAGE006
在媒染初期,通过中性电解质电离阴离子以及甲酸根离子双重作用下,抑制媒染剂中金属离子配聚反应的发生,有利于媒染过程中,金属离子向纤维内部的渗透;在媒染后期,通过加水稀释、升高温度、提高pH值等方式,使水合金属离子水解、配聚作用增大,使金属络合物分子变大,促进金属络合物与天然染料、纤维的结合,提高天然染料的染色牢度。
本发明的有益之处:本申请充分考虑金属媒染剂在溶液中的水解反应、配聚作用,在低碱度、较低温度和pH下,进行媒染处理,在媒染后期,通过提高pH、升温、加水稀释等方式,使水合金属离子水解、配聚作用增大,使金属络合物分子变大,促进金属络合物与天然染料、纤维的结合,提高天然染料的染色牢度。
具体实施方式
为了加深对本发明的理解,下面结合实施例详细描述本发明的具体实施方式,该实施例仅用于解释本发明,并不构成对本发明的保护范围的限定。
实施例1
步骤1):采用姜黄色素对真丝织物进行染色,天然染料用量为0.5%(o.m.f),浴比1:20,染色温度50℃,染色时间30min,染色结束后,织物经水洗3次,自然晾干,备用;
步骤2):将媒染剂硫酸亚铁溶于去离子水中,用甲酸调节pH值3,加入无水硫酸钠,待其完全溶解后,备用,
步骤3):将经步骤(1)染色织物浸入上述媒染浴中,媒染浴中各组分用量为:硫酸亚铁用量2%(o.m.f),无水硫酸钠5g/L;浴比1:5,20℃处理90min,加去离子水稀释至浴比1:30;然后升温至50℃,处理60min后,用小苏打调节溶液pH值至6,保温10min后,取出织物,织物经0.5%草酸溶液漂洗后,再用水洗3次,自然晾干,即可。
比较例1(传统媒染)
步骤1):采用姜黄色素对真丝织物进行染色,天然染料用量为0.5%(o.m.f),浴比1:20,染色温度50℃,染色时间30min,染色结束后,织物经水洗3次,自然晾干,备用;
步骤2):将经步骤(1)染色织物浸入媒染浴中,媒染浴组成为:硫酸亚铁用量2%(o.m.f),pH值3,pH值用冰醋酸调节;浴比1:40,40℃入染,以2℃/min速度升温至50℃,处理60min后,取出,织物经0.5%草酸溶液漂洗后,再用水洗3次,自然晾干,即可。
实施例2
步骤1):采用板栗壳色素对羊毛织物进行染色,天然染料用量为5%(o.m.f),浴比1:40,染色温度80℃,染色时间30min,染色结束后,织物经水洗5次,自然晾干,备用;
步骤2):将媒染剂氯化铁溶于去离子水中,用甲酸调节pH值4,加入无水硫酸钠,待其完全溶解后,备用,
步骤3):将经步骤(1)染色织物浸入上述媒染浴中,媒染浴中各组分用量为:氯化铁用量4%(o.m.f),无水硫酸钠10g/L;浴比1:8,25℃处理45min,加去离子水稀释至浴比1:40;然后升温至60℃,处理30min后,用小苏打调节溶液pH值至7,保温15min后,取出织物,织物经0.5%草酸溶液漂洗后,再用水洗5次,自然晾干,即可。
比较例2(传统媒染)
步骤1):采用板栗壳色素对羊毛织物进行染色,天然染料用量为5%(o.m.f),浴比1:40,染色温度80℃,染色时间30min,染色结束后,织物经水洗5次,自然晾干,备用;
步骤2):将经步骤(1)染色织物浸入媒染浴中,媒染浴组成为:氯化铁用量4%(o.m.f),pH值4,pH值用冰醋酸调节,浴比1:40;然后以2℃/min速度升温至60℃,处理30min后,取出,织物经0.5%草酸溶液漂洗后,再用水洗5次,自然晾干,即可。
实施例3
步骤1):采用栀子黄色素对真丝/毛混纺织物进行染色,天然染料用量为1%(o.m.f),浴比1:30,染色温度60℃,染色时间40min,染色结束后,织物经水洗4次,自然晾干,备用;
步骤2):将媒染剂硫酸铝溶于去离子水中,用甲酸调节pH值3.5,加入无水硫酸钠,待其完全溶解后,备用,
步骤3):将经步骤(1)染色织物浸入上述媒染浴中,媒染浴中各组分用量为:硫酸铝用量3%(o.m.f),无水硫酸钠6g/L;浴比1:6,22℃处理60min,加去离子水稀释至浴比1:35;然后升温至55℃,处理45min后,用小苏打调节溶液pH值6.5,保温12min后,取出织物,织物经0.5%草酸溶液漂洗后,再用水洗4次,自然晾干,即可。
比较例3
步骤1):采用栀子黄色素对真丝/毛混纺织物进行染色,天然染料用量为1%(o.m.f),浴比1:30,染色温度60℃,染色时间40min,染色结束后,织物经水洗4次,自然晾干,备用;
步骤2):将经步骤(1)染色织物浸入媒染浴中,媒染浴组成为:硫酸铝用量3%(o.m.f),pH值3.5,pH值用冰醋酸调节,浴比1:35;然后以2℃/min速度升温至55℃,处理45min后,取出,织物经0.5%草酸溶液漂洗后,再用水洗4次,自然晾干,即可。
实施例4
步骤1):采用苏木色素对真丝织物进行染色,天然染料用量为2%(o.m.f),浴比1:25,染色温度70℃,染色时间35min,染色结束后,织物经水洗5次,自然晾干,备用;
步骤2):将媒染剂氯化锌溶于去离子水中,用甲酸调节pH值3.3,加入无水硫酸钠,待其完全溶解后,备用,
步骤3):将经步骤(1)染色织物浸入上述媒染浴中,媒染浴中各组分用量为:氯化锌用量2.5%(o.m.f),无水硫酸钠8g/L;浴比1:7,23℃处理75min,加去离子水稀释至浴比1:32;然后升温至52℃,处理40min后,用小苏打调节溶液pH值6.7,保温13min后,取出织物,织物经0.5%草酸溶液漂洗后,再用水洗5次,自然晾干,即可。
比较例4
步骤1):采用苏木色素对真丝织物进行染色,天然染料用量为2%(o.m.f),浴比1:25,染色温度70℃,染色时间35min,染色结束后,织物经水洗5次,自然晾干,备用;
步骤2):将经步骤(1)染色织物浸入媒染浴中,媒染浴组成为:氯化锌用量2.5%(o.m.f),pH值3,pH值用冰醋酸调节,浴比1:32;然后以2℃/min速度升温至52℃,处理40min后,取出,织物经0.5%草酸溶液漂洗后,再用水洗5次,自然晾干,即可。
实施例5
颜色深度(K/S值)的测定:将染色织物折叠两次(四层),采用Datacolor SF600X电脑测色配色仪在λmax处测定染色织物的K/S值,每个试样测四次取平均值。
色牢度的测定:耐摩擦色牢度按GB/T 3920-2008规定方法测定;耐洗色牢度按GB/T 3921-2008《纺织品 色牢度试验 耐皂洗色牢度》方法测定。
表1 染色织物的K/S值及其色牢度
Figure 800456DEST_PATH_IMAGE007
从上表可看出,采用本发明方法染色织物K/S值,摩擦牢度、皂洗牢度明显高于传统媒染方法所得织物。

Claims (4)

1.一种天然染料染色方法,其特征在于,包括下列步骤:
步骤1):采用天然染料对织物进行染色,天然染料用量为0.5-5%(o.m.f),浴比1:20-40,染色温度50-80℃,染色时间30-45min,染色结束后,织物经水洗3-5次,自然晾干,备用;
步骤2):将媒染剂溶于去离子水中,调节pH值3-4,加入中性电解质,待其完全溶解后,备用;
步骤3):将经步骤(1)染色织物浸入步骤2)中的媒染浴中,浴比1:5-1:8,20-25℃媒染温度下处理45-90min后,加去离子水稀释至浴比1:30-1:40;然后升温至50-60℃,处理30-60min后,调节溶液pH值至6-7,保温10-15min后,取出织物,经0.5%草酸溶液漂洗后,再用水洗3-5次,自然晾干,即可。
2.根据权利要求1所述的一种天然染料染色方法,其特征在于:所述步骤(1)中的天然染料为姜黄色素、板栗壳色素、栀子黄色素、苏木色素、紫胶色素中的一种或几种。
3.根据权利要求1所述的一种天然染料染色方法,其特征在于:所述步骤(1)中的织物为真丝织物、羊毛织物或丝/毛混纺织物。
4.根据权利要求1所述的一种天然染料染色方法,其特征在于:所述步骤(2)中的媒染浴组成为:媒染剂用量2-4%(o.m.f),pH值用甲酸调节;中性电解质5-10g/L;其中:媒染剂为:二价铁盐、三价铁盐、三价铝盐、二价锌盐、四价钛盐中的一种;中性电解质为无水硫酸钠或氯化钠。
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