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Analysis and solutions to the causes of stains in acrylic dyeing



Reason for color flowers:</p 1. Improper dye selection</p 染腈纶与染其他纤维不同,如果染料选择不当,即使通过多加入匀染剂或者改善染色条件也很难达到匀染的效果。因此选阳离子染料应选配伍值相同的染料,配方中染料的配伍值差异要小于0.5。 </p 2. Leveling agent sel…

Reason for color flowers:</p

1. Improper dye selection</p

染腈纶与染其他纤维不同,如果染料选择不当,即使通过多加入匀染剂或者改善染色条件也很难达到匀染的效果。因此选阳离子染料应选配伍值相同的染料,配方中染料的配伍值差异要小于0.5。

</p

2. Leveling agent selection and Improper dosage</p

⑴Acrylic fiber leveling agents are divided into two categories: slow dyeing leveling agents and shifting dyeing leveling agents</p

a. Retarder leveling agents are also called dye resisters. The retarding principle of retarding leveling agents is as follows: during dyeing, the retarder occupies the dye seat first. As the temperature gradually increases, the retarder is absorbed by the dye. Substitute and combine with fibers to achieve the purpose of leveling. �</p

Precautions when using retarder:</p

①如果用量少,匀染效果不好,易造成色花。如果用量过多,也会造成色花。

②由于大多数腈纶上染的关键温度为90℃左右。如果PAN的用量适当,在90℃保持20分钟就可以匀速上染。如果过量,就会造成上染温度升高,染色速度加快,从而造成色花。

③以庄杰的阳离子匀染剂ZJ-CH13为例,一般来说,深色用量为1g/l ,中浅色用量为0.2-0。5g/l。

b. 移染匀染剂 :它具有迁移、移染的性能,能够把染料从色深的地方迁移到色浅的地方。

</p

3. Differences in raw materials</p

国内各公司生产的腈纶,染色性能各不相同,比如:上海金山化工厂的腈纶上色快,兰州石化的腈纶上色较慢,这样就给染厂带来很大的困难。

</p

4. Improper control of temperature rise</p

一般来说,腈纶从80℃开始上色,87-92℃之间是上色的关键阶段,在这期间必须慢升温,速度在1℃/3分钟—1℃/6分钟之间。好在90℃时保温20分钟.

</p

5. PH value changes</p

染腈纶时,PH值应掌握在3.5—5.5之间。PH值低时,上染速度慢,不容易染花。但PH值过低,染色牢度差。PH值高时,上染速度快,得色高。但PH过高时,容易染花,如果PH 高于6,还可能会造成变色。

一般来说染腈纶的PH值掌握在4.5左右。染腈纶用醋酸,为了保证在染色全过程中PH值趋于稳定,在染浴中加入醋酸钠为PH值的缓冲剂,使染色上色过程不随PH浮动而变化,达到匀染效果。一般醋酸钠的用量为0.5g/l。

</p

6. Impact of water quality</p

染腈纶要使用软水,总硬度值在75PPM以下。如果水的硬度高,就会造成染花。有些染厂经常出现染花的现象,可能是水的硬度过高造成的。

</p

综上所述;染腈纶与染其他纤维相比。难度要高一些,制定工艺时,考虑的因素比较多。如何制定一个佳的染色工艺,建议实验室多次打样确定工艺。

Normal temperature</p

此升温工艺是比较通用的染色工艺。客户可根据所染布、纱的种类进行适当调整。比如:

①克重小的布升温要慢些,克重大的布可升温快一些。

②高支纱升温要慢些,低支纱升温可快些。

③Dark colors heat up faster, while light colors heat up slower</p

④Dark colors should be kept warm at 98℃ for a longer time, 45 minutes to 60 minutes, but light colors only need to be kept</p

保温15分钟就可以了�

Extended reading: https://www.china-fire-retardant.com/post/9379 .html
Extended reading: https://www.yingjietex.com/product/1600D-YARN-DYED-OXFORD-Fabric.html
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Extended reading:https://www.china-fire-retardant.com/post/9393.html
Extended reading: https://www.china-fire-retardant.com/post/9568.ht

Author: clsrich

 
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