CN102965979A - Green and environment-friendly textile printing process - Google Patents

Abstract

The invention relates to a green environmental protection textile printing process, which includes the steps of pulp mixing, printing and steaming. The pulp mixing includes the preparation of color paste and the preparation of original paste. The colorant is stirred until uniform, and the original paste is prepared by adding pure sodium alginate to the prepared color paste to adjust the paste to the corresponding viscosity; the proportion of the color paste is that the reactive dye accounts for 5.5-6.5% of the total weight of the color paste. The agent RUF accounts for 8-12% of the total weight of the color paste, the resist salt S accounts for 1-3% of the total weight of the color paste, the original paste accounts for 55-65% of the total weight of the color paste, and the water accounts for 20-20% of the total weight of the color paste. 25%; the ratio of the original paste is 2-6% sodium alginate and 94-98% water. The production process of the present invention does not need to use urea, which saves production costs and reduces environmental pollution; its product quality is the same as that of traditional printing products, and it is a green and sustainable green printing process.

Description

A Green and Environmentally Friendly Textile Printing Process

technical field

The invention belongs to the technical field of textile printing, in particular to a green and environment-friendly textile printing process.

technical background

Printing is the process of making color paste from dyes or paints, applying them on textiles, and printing patterns. When printing, the dye is adjusted into a color paste. After printing and drying, steaming, color development or color fixation are usually carried out, and then soaping and water washing are carried out to fully remove the paste, chemicals and floating colors in the color paste. Printing paste is composed of dyes, auxiliaries and raw paste. Dyes can generally be divided into direct dyes, insoluble azo dyes, reactive dyes and so on. Nowadays, reactive dyes are the main dyes for cellulose fiber printing because of their complete color spectrum, high wet fastness and soft hand feeling. Reactive dyes are not only widely used in cotton, viscose, tencel, and linen fabrics, but also in real silk fabrics. The function of the original paste is to transfer dyes and chemical auxiliaries to the fabric. After printing, the dye (paint) is fixed, and the original paste is washed away. It does not react during the printing process, and mainly acts as a transfer medium. Auxiliaries are generally urea; NaHCO ₃ ; anti-staining salt S, etc., depending on the fiber structure of the fabric, add auxiliaries.

Reactive dyes are widely used due to their many advantages, but there are many problems in printing, such as low color fixation rate, easy white staining, and difficulty in dye diffusion and penetration. In order to solve these problems, a large amount of urea is often added to the color paste during production. Urea is the product of carbon dioxide and ammonia at 180-200°C and 200pa. It is a white powder or crystal, deliquescent, soluble in water at a ratio of 1:1, and the solution is slightly alkaline. Urea has the properties of solubilization, dissolution and moisture absorption, and can be used to prepare dyes, help dyes dissolve and stabilize colorants. The main effects of urea on reactive dyes are as follows:

(1) Although the reactive dye molecule has a hydrophilic sulfonic acid group, the solubility is already good, but due to the high amount of dye used in printing and the small bath ratio, urea is still needed to help dissolve it.

(2) Urea is a hygroscopic agent with a moisture absorption of about 24.4%. It has hygroscopic effect during steaming, and can also promote fiber expansion, which is beneficial to dye penetration and improves color yield. It has a more significant color yield effect on thermosetting dyes.

(3) Urea is the water retention agent in the color paste, and the minimum dosage of urea is generally 1%. When the amount of dye is higher than 1%, the amount of urea is equal to the dye or increased by 3%-5%.

However, the active printing process not only increases the production cost due to the large amount of urea used, but also urea is discharged into the water body and naturally decomposes into carbon dioxide and nitrogen-containing compounds. The latter can accelerate the growth of algae and eventually cause eutrophication of water quality. High content, serious pollution. Therefore, in today's environment of concern, reducing the use of urea and developing a printing process with less urea or even a printing process without urea has become an urgent problem to be solved.

Contents of the invention

In order to overcome the deficiencies of the prior art, the invention provides a green environmental protection textile printing process without adding urea to reactive dyes.

The present invention is realized by following technology:

A green and environmentally friendly textile printing process, including paste mixing, printing, and steaming processes, characterized in that: the paste preparation includes the preparation of color paste and the preparation of raw paste, and the color paste is prepared by stirring the chemical materials according to the proportion of the color paste, and then adding The color fixing agent is stirred until uniform, and the original paste is prepared by adding pure sodium alginate to the prepared color paste to adjust the paste to the corresponding viscosity; the proportion of the color paste is that the reactive dye accounts for 5.5-6.5% of the total weight of the color paste The colorant RUF accounts for 8-12% of the total weight of the color paste, the resist salt S accounts for 1-3% of the total weight of the color paste, the original paste accounts for 55-65% of the total weight of the color paste, and water accounts for 20% of the total weight of the color paste. ~25%; the ratio of the original paste is that sodium alginate accounts for 2-6% of the total weight of the original paste, and water accounts for 94-98% of the total weight of the original paste.

Described reactive dyestuff adopts the PF series reactive printing dye product that U.S. Huntsman textile dyeing chemical company provides, comprises products such as reactive red PF-2G, reactive red PF-2B, reactive yellow PF-4G and reactive yellow PF-2R; The colorant RUF is a product provided by Huntsman Textile Effects and Chemicals Company of the United States.

The water temperature of the chemical is strictly controlled below 90°C, the chemical temperature of the monochloro-s-triazine reactive dye is 80°C, and the chemical temperature of the vinylsulfone reactive dye is not allowed to exceed 70°C; Alkali, the dosage is 10Kg per hectoliter, mix and stir with the dye, add warm water at 60°C while stirring to chemicalize the material, the material water has no particles and is in a black and translucent state, then stop the stirring and place it for use.

The printing should ensure penetration, the front and back are consistent, the dry humidity of the falling cloth should be strictly controlled, and the temperature of the dry cloth surface should be controlled at 20°C to 30°C.

The steaming requires a humidity of 0.4-0.8Kg, and the cloth surface is slightly damp.

Compared with the prior art, the present invention has the following advantages: no need to add urea in the production process of the present invention, which saves the production cost and reduces the pollution to the environment; the quality of its printed products is the same as that of traditional printed products, and both reach the national textile industry. Quality standards; and low cost, low energy consumption, less pollution, is a green and sustainable green printing process.

Detailed ways

Below by embodiment the present invention will be further described.

Embodiment 1: small sample test

The comparative experiment of traditional printing and new printing using pure cotton fabric, the color paste prescription is as follows:

As shown in the above tables 1 and 2, there is no urea and alkali agent in the printing prescription of the printing process of the present invention, but the color fixing agent RUF is used. The color fixing agent RUF is provided by Huntsman Textile Effects and Chemicals Company of the United States. Reactive dyes were provided by Huntsman Textile Effects and Chemicals Company of the United States.

Process flow: Weighing→Chemicalizing→Pulp mixing→Printing→Steaming (104℃, 7min.)→Washing→Soaping→Washing→Drying

This experiment uses AR224CN electronic balance to weigh materials; STM-G2003 steamer, the parameters are: steam pressure 0.5mpa±0.05mpa, temperature 104°C±1°C, time 7min.

(1) Traditional printing process

Weighing: Weigh enough dyes, baking soda, urea and anti-staining salt.

Chemical material: Stir the chemical material according to the ratio of the color paste.

Sizing: add pure sodium alginate to adjust the slurry to the corresponding viscosity.

Auxiliaries used in this printing process and their functions: baking soda, alkali agent, printing color fixing agent (weak alkaline at room temperature, more alkaline at high temperature); anti-dyeing salt S, weak oxidant; urea, aid in solubility and moisture.

(2) Printing process of the present invention

Weighing: Only weigh resist salt S and reactive dyes.

Chemical material: Stir the chemical material according to the ratio of the color paste. Then add the corresponding color fixing agent and stir until uniform.

Sizing: add pure sodium alginate to adjust the slurry to the corresponding viscosity.

The traditional printed products and the printed products of the present invention are subjected to the following treatments: (1) The printed products are subjected to humidification treatment, and then steamed. (2) After printing, the product is dried and then steamed.

Result: the comparison of the product quality standards between the traditional process and the process of the present invention is shown in Table 3.

Example 2: Large cargo experiment

Technological process: calico rolling → pulping → printing → steaming → washing → tentering

The printing machine used in this experiment is a rotary screen printing machine, and its parameters are: speed 20-40m/min, pressure 1-10mpa, blade 45*0.15 50*0.15mm, drying room temperature 100-130℃.

After printing, steaming is carried out, the purpose of which is to make the printed textile complete the moisture absorption and temperature rise of the fiber and the color paste film, accelerate the reduction of the dye, that is, the dissolution on the fiber, and make the dye diffuse into the fiber and fix it on the fiber. In this experiment, Italian Arioli bottomless steamer was used. The parameters are: vehicle speed 30±0.5m/min, temperature 103±1℃, time 7min±30s, main steam pressure 0.2±0.05mpa, ring length 190±5cm, saturation Steam tank pressure 0.03±0.01mpa.

After steaming, wash with water. The parameters of the washing machine are: vehicle speed 40-70m/min; washing temperature 1-2# washing tank cold water washing, open cold water spray 2±0.3m ³ /h, turn on the water circulation pump in 2# washing tank , 3-10# washing tank 95 ± 2 ℃ hot water washing, water flow rate of 2 ± 0.3 m ³ /h, step by step reverse flow, 4 #, 7 # washing tanks add soaping liquid, soaping material rotor flow, 4 The washing flow rate of #washing tank is 300L/h, the washing flow rate of 7# washing tank is 300L/h, the pH value of the first half of the 11# washing tank is adjusted to 6.5±0.5, the temperature is 55±5℃, and the rear half of the 11# washing tank is 70 Wash with warm water at ±5°C and add water for circulation, the flow rate of circulating water is 4±0.3m ³ /h. The pressure of the two-roll paddle is 0.3±0.05Mpa, the pressure of the three-roll paddle is 0.6±0.05Mpa, the tension of the tension frame is 0.25±0.05Mpa, the steam pressure of the drying cylinder is within 0.2Mpa, and the humidity of the falling cloth is controlled at 6±0.5Kg.

Stentering after washing, the parameters of the tenter machine are: vehicle speed 45-55m/min, hot air pressure 0.3-0.4mpa/bar, 1#, 8# drying room temperature 140-150℃, 2-7# drying room temperature 160°C.

(1) Traditional printing process

Weighing: Strictly weigh the accuracy to ensure the accuracy of the process. The additives are weighed strictly according to the process amount to weigh urea and anti-staining salt. Only 50L and 100L barrels are allowed for weighing. Prepare 100L slurry and weigh.

Chemicals: The water temperature is strictly controlled below 90°C, 80°C is used for the monochloro-s-triazine type, and the chemical temperature of the vinylsulfone dye is not allowed to exceed 70°C. Make sure that the chemical material is sufficient, and the material water has no particles and is in a black and transparent state, then stop stirring and place it for use. For special colors, urea is needed for dissolution aid.

Stirring: Push the accurately weighed slurry to the timing mixer for full stirring (timed stirring for 2 minutes), take an appropriate amount of slurry with a small beaker to measure the viscosity and record it

Printing: Guaranteed penetration, consistent front and back.

Steaming: steaming according to the standard process, the moisture content of the cloth surface is required to reach 0.4kg.

(2) Printing process of the present invention

Weighing: Strictly weigh the accuracy to ensure the accuracy of the process, only the anti-staining salt and reactive dyes are weighed, and no other additives are added.

Chemicals: The water temperature is strictly controlled below 90°C, 80°C is used for the monochloro-s-triazine type, and the chemical temperature of the vinylsulfone dye is not allowed to exceed 70°C. Make sure that the chemical is sufficient. When chemical, first add the color-fixing agent RUF, the dosage is 10kg/100L, mix and stir with the dye, and add warm water (60°C) to chemical while stirring. The water has no particles and is in a black and transparent state. Stop the stirring and place it for later use.

Blending: the paste is made of pure seaweed without any additives, and the corresponding viscosity can be adjusted.

Printing: Guaranteed permeation, the front and back are consistent, and the dry humidity of the falling cloth is required to be strictly controlled, controlled at 80% dry on the cloth surface, and the temperature of the cloth surface is 20°C-30°C.

Steaming: It is required that the amount of moisture supplied by steaming should be large, and the cloth surface should be slightly damp to achieve the effect of supplementing urea.

(3) Textile testing

Textile testing is the work of testing and appraising the quality of textiles in accordance with relevant laws, administrative regulations, standards or other regulations. The testing standards are divided into national standard GB, industry standard FZ, international standard ISO, etc. The routine testing items include fabric rubbing fastness, washing fastness, hand feeling, color performance, etc. In this test, the rubbing fastness, original whitening, and color of printed fabrics with traditional and new printing techniques are tested. The indicators are as follows:

Result: the traditional process and the product quality standard of the process of the present invention are compared, see Table 6.

It is known from Table 3 and Table 6 that the two processes are basically the same in terms of color fastness, color depth, and hue.

In addition, the hand feeling is also the same; the urea-free printing must obtain greater humidity conditions during steaming. From this test, it can be concluded that the color yield and color brightness of the dyes without urea printing are basically the same as those of conventional printing.

In this experiment, the printing process of the present invention (no urea) is compared with the traditional printing (urea). The quality of the former printing product is the same as that of the traditional printing product, and both reach the national textile quality standard. And low cost, low energy consumption, less pollution, is a green and sustainable green printing system.

Claims (5)

1. environmental protection technology for printing fabric made, comprise and size mixing, stamp, evaporate operation, it is characterized in that: described size mixing comprise mill base preparation and former paste standby, mill base is prepared as in the mill base ratio and carries out the material stirring, rear adding color-fixing agent is stirred to evenly, and former paste is prepared as in the mill base that makes and adds pure sodium alginate and size mixing to corresponding viscosity; The proportioning of mill base be REACTIVE DYES account for the mill base gross weight 5.5～6.5%, Fixative R UF account for the mill base gross weight 8～12%, reservehao S account for the mill base gross weight 1～3%, former paste account for the mill base gross weight 55～65%, water accounts for 20～25% of mill base gross weight; The proportioning of former paste be sodium alginate account for former paste gross weight 2～6%, water accounts for 94～98% of former paste gross weight.

2. environmental protection technology for printing fabric made according to claim 1, it is characterized in that: described REACTIVE DYES adopts U.S.'s Hensel to step the PF series reactive printing dyes product that dying of weaving company provides, and comprises reactive red PF-2G, reactive red PF-2B, reactive yellow PF-4G and reactive yellow PF-2R product; Fixative R UF is that U.S.'s Hensel steps dying of weaving company product.

3. environmental protection technology for printing fabric made according to claim 1 and 2, it is characterized in that described material water temperature is strict controlled in below 90 ℃, the material temperature of one chloro-s-triazine type REACTIVE DYES is 80 ℃, and the material temperature of vinyl-sulfone reactive dyes does not allow above 70 ℃; Add first color-fixing agent during material, consumption is every hectolitre 10Kg, carries out and the dyestuff mix and blend, adds 60 ℃ of warm water and carry out material when stirring, and material water is pitch-black bright state without particle, can stop stirring and place stand-by.

4. environmental protection technology for printing fabric made according to claim 1 and 2 is characterized in that: described stamp guarantees infiltration, and is positive and negative consistent, strictly controls the cropping humidity behind the stamp, is controlled at cloth cover and most probably does 20 ℃ ~ 30 ℃ of cloth surface temperatures.

5. environmental protection technology for printing fabric made according to claim 1 and 2, it is characterized in that: the described requirement humidity of evaporating reaches 0.4 ~ 0.8Kg saturated vapor, and cloth cover is tide slightly.