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High -resistant alkali -resistant dye chromatin and application

Views: 1     Author: Site Editor     Publish Time: 2022-10-11      Origin: Site Inquire

01 High alkali -resistant dye dyes should be at the same time


Disted dyes of high alkali resistance are not only adapted to the dyeing polyester under weak acidic conditions, but also applies to dyeing polyester under neutral and alkaline conditions. The process execution process is to take the pre -treatment of polyester and dyeing a bath.

Taking polymer coral velvet as an example, the process parameters and operation points of polyester ultra -fine fiber dyed, open fiber, and alkaline decreases under high alkaline conditions. This process has greatly shortened the process and saves time, thereby achieving the purpose of energy saving, reducing emission reduction, and reducing production costs, while reducing environmental pollution. After testing, indicators such as color fastness, color light meet the requirements, and are a new process worthy of respect.


02 The dyeing and high alkali resistance of traditional polyester are scattered


Polyester is a type of synthetic fiber with a large amount of applications. For many years, polyester dyeing has been used to use high -temperature and high -pressure staining traditional processes under weak acidic conditions. For polyester materials that require high alkali treatment, this process has many processes, long process, large consumption of water, electricity, and auto consumption, low production efficiency, high production cost, large sewage discharge, increased the degree of pollution of the ring pen. Increase the burden of processing wastewater.


Using high -alkali -resistant dye dye dye polyester can overcome these shortcomings. Penglai Jiaxin Dye Chemical Co., Ltd. has been committed to the research of high -alkaline -resistant decentralized dyes in recent years. Production and development of high -alkali -resistant dispersed dyes composed of more than a dozen colors such as yellow, foreign red, orchids, Shenlan, and: Polyester is stained in the range of pH = 4.5 to 14.0. Because it can resist 10g/L strong alkali and 6g/L hypox, it can be applied to various dyeing processes of many polyester fabrics. This study takes polymer coral velvet as an example to explore the dyeing process of high -alkali -resistant dye dyes.


03 The general dyeing process of polygin coral velvet


The dyeing and rectification of polygin coral velvet fabric (usually polyester brocade quality ratio 80:20) is generally used to reduce the amount of alkaline and alkaline, then washed and neutralized, and then dyeing polyester in acidic.


The process of dyeing and rectification is as follows: Rough cloth → retreat → sewing head → predetermined → alkaline reduction (boiling fiber) → water washing → high temperature and high pressure dyeing → reducing and cleaning → water washing → upper soft → dehydration → dehydration → dehydration → dehydrated → Drying → pulling hair → combing hair → cutting hair → (shaking grains) → pull fixed shape → later sorted.


1. Booking shape

The processing shape of polygin coral velvet is a key process. After the predetermined rough cloth that passes through alkali reduction (open fiber) and dyeing, the coral silk is bent and messy, irregular, and the coral velvet style cannot be achieved. Essence After the predetermined shape, the corals are arranged regular, straight and fluffy, the base structure is tight and stable, and it is not easy to curl the edge during subsequent dyeing and rectification.


The predetermined shape of coral velvet rough cloth generally has a temperature of 165 to 90 ° C. The time is determined according to the speed of the vehicle, and the tension can reach the flat fabric.


2. Alkali reduction (open fiber)

In the printing and dyeing factory, the use of liquid alkali (generally 30%liquid alkali dosage of 5-8 g/L, can also be converted with chip alkali) for alkaline reduction (open fiber), dissolving the water -soluble polyester in polyester fibers During, the two fiber fibrous filament strips that were originally bonded together were scattered and fluffy, becoming polyester / Jin Chao fine fiber single beam [2]. After washing and acid neutralization, the cloth surface does not conform to alkali, and it is neutral or weakly acidic, which is conducive to the subsequent process of acid staining under high temperature and high pressure. During the above -mentioned dyeing process, the fiber reduction rate is about 5.O % to 6.0 %. Insufficient reduction rate will affect the feel, too much reduction rate will destroy the fabric fiber structure and affect strength. It is necessary to experiment to find reasonable alkali consumption, formulate reasonable process conditions, and ensure that the reduction rate is stable and normal, and cannot exceed 7%to 8%.


The dyeing process consumes a lot of water and ice acetic acid, and the amount of electricity and steam is relatively large. At the same time, a large amount of alkaline sewage is discharged, which increases production costs invisibly.


Alkaline reduction formula


EPD L.0g/L, 30% NAOH 10.0g/L, reduced volume promotion agent 1.0 to 1.5g/L, bath ratio 1: 15-1: 20, temperature 130 ° C, 20 ~ 30 min Essence The amount and time of the alkali and liquid depend on the weight rate of the customer's requirements, which must be tested before; the bath ratio is appropriately selected according to the equipment. Some printing and dyeing plants use temperature of 98 ° C, time of 60min or temperature 110 ° C, and 40min open fiber. The process formula should be adjusted accordingly according to the actual situation.


3. High temperature and high pressure dyeing process


The coral velvet after alkaline reduction is performed under PH = 4.5 ~ 5.0. Due to the larger surface area of the polyester brocade after opening fiber Slow to prevent the generation of color flowers and stains.


Craft formula (color matching): Disted dye A dosage X (OMF), decentralized dye B dosage y (OMF), high temperature and even dyeing agent 1.0g/L, acetic acid 1.0g/L (pH = 4.5 ~ 5.0), bath ratio 1 1 : 8 ~ 1: 12, the temperature is 130 ℃, the time is 30 to 40min (depends on the amount of visual dyes).


Restore cleaning (or soap washing) process: insurance powder 2.0 ~ 4.0g/L, tablets 2.0g/L, bath ratio 1:10, temperature of 90 ℃, 20min time.


04 new process of dyeing and dyeing of alkali -resistant dyeing dyes


The characteristics of high -alkali -resistant dye: conventional decentralized dyes are dyed under acidic conditions, while opening fiber is performed under alkaline conditions. Infinitive (especially under high temperature conditions), color change or even colorless phenomenon occurs. After a large number of experiments, it is confirmed that conventional decentralized dyes cannot achieve the one -bath method of open fiber and dyeing. The use of high -alkali -resistant dyes can make the opening fiber and dyeing at the same time, which greatly shortens the process.


High -alkaline -resistant dye dye has a wide range of dyes, and has many varieties. It can be performed under PH = 4.5 ~ 14.0 conditions; and good improvement, good dyeing; good dispersion. Due to dyeing and discharge under alkaline conditions, the problem of long -term disturbance of polyester dyeing is also solved, and the problem of color flowers, stains and equipment, and pipeline cleaning caused by low polymers. It does not need to be restored to clean after the light and medium -color dyeing.


05 New process of dyeing dye high -bean -resistant dye


1. Process process


Rough cloth (scripture or weft) → (predetermined) → open fiber, dyeing one bath → water washing → (restore cleaning or soap washing) → dehydration → opening shaped (dipping, humid and dry softener) → After finishing.


2. Process formula


The amount of high-alkali-resistant dye dyes x, 30% NaOH 7.0 g/L, alkaline dispersant FA L.0 G/L, oil-de-refined agent EPD-C 1.0 g/L, bath ratio 1: 10 ~ 1: 15, The temperature is 130 ° C, and the time is 40-50 min.


3. Note


(1) Selection of alkaline -resistant additives. Dyeing at high temperature and high -voltage alkali has higher requirements for the additives: it has good alkali resistance (good stability is dispersed at pH = 14), uniform dyeing, hard water, less foam, easy to clean, not sticking to not stick Pollution equipment, environmentally friendly and non -toxic, meets the environmental protection requirements of textiles. A dozen alkaline dyeing agents at home and abroad were screened, a large number of experiments and testing were performed. Finally, the alkaline high -temperature dispersant FA was selected.


(2) Due to the large surface area of polyester / Jin Chao fine fiber than the surface area and thin fiber diameter, the absorption speed of decentralized dyes is fast, which can easily cause color flowers and pigmentation. Therefore, it is necessary to strictly control the heating rate, especially when the temperature is above 80 ° C. It is necessary to control it at 1.0 ° C/min to prevent too fast upper dyeing and cause color flowers.


(3) Because high -alkali -resistant dye dyes are greater than conventional decentralized dye viscosity, the decentralized agent should be checked first, then add the ductual cylinder, stir well with the decentralized dyes, and then enter the dye cylinder. If necessary, filter is filtered, and then enter the dye tank. After adding the dye, run 10 min first, and then slowly hear the dyeing according to the program.


06 dyeing effect


1. Dyeing fastness

Selected the three primary colors of alkali-resistant dye dye, scattered yellow HA-2RW 100%, 200%scattered red HA-R, and 200%of the dispersion blue HA-RL as the representative, testing its dyeing fastness under alkaline conditions. As a result, see Table 1. It can be seen from Table 1 that the three primary colors of high -alkaline dye dye dyeing under alkaline conditions are all level 4 or more. Essence


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