CN102852006B - Brightening dyeing method for wool knitting fabric - Google Patents

Abstract

The invention discloses a brightening dyeing method for wool knitted fabrics, which comprises: a pretreatment process, a dyeing process and a cleaning process. In the dyeing process of the method of the invention, the oxygen bleaching process and the dyeing process are combined, that is, dyeing while bleaching under acidic conditions. At the same time, temperature insulation steps are realized in the dyeing process, that is, the insulation platform is set in the middle of the dyeing heating process, so that the dyes can dye wool fibers more evenly. The invention is easy to operate, has low requirements on equipment and saves time; the hydrogen peroxide consumption in the dyeing method of the invention is obviously lower than that in the traditional bleaching process. The wool knitted fabric dyed by the present invention has a remarkable bright feeling, and the brilliance of the shade is significantly improved compared with the traditional wool dyed, and the strength of the wool knitted fabric is effectively protected, which can fully meet the normal wearing conditions.

Description

A kind of brightening dyeing method of wool knitted fabric

technical field

The invention relates to a brightening dyeing method for fabrics, in particular to a brightening dyeing method for wool knitted fabrics, which belongs to the field of textile printing and dyeing.

Background technique

With the progress of society and the continuous improvement of living standards, people pay more attention to the individual needs of clothing. The color system of clothing fabrics shows a trend of diversification. Major buyers have higher and higher requirements for the shade of fabrics. Wool, as a traditional natural fiber, has the advantages of comfort, warmth, and resistance to deformation after a series of weaving, dyeing and finishing processes, and has a high value for consumption. However, the dyeing color system of wool fabrics has not been well broadened, mainly in dark colors. The main reasons are as follows: (1) The wool fiber itself is light yellow, and if it is shaped, the yellowness will be further improved; from the perspective of color superposition, the light yellow background will obviously dye wool in bright colors cause negative impact. (2) In order to further improve the color fastness of wool fabrics, a considerable number of manufacturers in the industry now use reactive dyes for wool to dye wool fabrics. Reactive dyes have very good washing fastness. However, its disadvantages It is the brightness of the color that is duller than that of acid dyes.

The way to improve the light yellow background color of wool fabrics is bleaching. However, conventional pre-dyeing bleaching uses a large amount of hydrogen peroxide, high bleaching temperature, and a long time. After pretreatment, the whiteness of wool fabrics has been significantly improved. After finishing, finishing and other processes, the physical strength of the finished wool fabric will also be greatly reduced, the damage will be serious, and it may even be unusable.

In summary, the following problems exist in the brightening dyeing process of wool knitted fabrics:

(1) In the process of wool bleaching, the degree of physical strength damage of wool fiber depends on the two factors of the amount of hydrogen peroxide and the temperature. (2) Acid dyes with bright colors, such as sapphire blue and sky blue dyes, tend to produce unevenness or color flowers on the wool fabric surface, especially the medium and light-colored wool fabric surface. (3) The process of adding hydrogen peroxide, if it is added too quickly, the temperature will be too high, resulting in uneven oxygen bleaching, and finally uneven color and light on the cloth surface.

Therefore, those skilled in the art are committed to developing a new dyeing process for woolen brightening, using reasonable techniques to increase the whiteness of woolen fabrics, and then improving the brightness of woolen fabrics after dyeing; while making the physical strength of woolen to a certain extent. range of protection.

Contents of the invention

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a process for improving the brightness of wool fabric after dyeing.

In order to achieve the above object, the invention provides a method for brightening dyeing of wool knitted fabrics,

Aiming at the dyeing difficulties in the prior art, the present invention makes targeted changes to the existing brightening dyeing process parameters and dyeing and chemical auxiliaries, and formulates a new brightening dyeing process suitable for wool knitted fabrics.

Compared with the prior art, the present invention combines the oxygen bleaching process with the dyeing process, and the bleaching is carried out under acidic conditions. It also greatly shortens the physical movement time of the wool knitted fabric in the bath, reduces the physical friction damage of the wool knitted fabric, and effectively protects the physical strength of the wool fiber.

Aiming at the problem that bright-colored acid dyes are easy to produce colored flowers, the present invention sets a temperature insulation ladder, that is, during the dyeing heating process, a heat preservation platform is set in the middle, so that the dye can dye wool fibers more evenly. At the same time, the organic anionic gradient acid is selected, and as the temperature rises, the organic acid is slowly released, and the pH is gradually reduced, so as to achieve the purpose of level dyeing.

Specifically, the brightening dyeing method of wool knitted fabric of the present invention includes a pretreatment process, a dyeing process and a cleaning process; the dyeing process includes an oxygen bleaching process and a dyeing process, and the oxygen bleaching process and the dyeing process are carried out simultaneously of.

In the traditional process of wool dyeing, wool is generally only dyed without bleaching. Its reason is because the bleaching temperature of traditional technology is high, takes a long time, and the consumption of hydrogen peroxide is 2-4 times of the consumption of the present invention, and damages big to wool fiber. In addition, if the bleaching process is carried out separately from the dyeing process, the process flow of the process will be lengthened, and the damage to the wool fiber will also be increased.

In a preferred embodiment of the present invention, the post-finishing process may also be included, that is, dehydration, drying, soft setting and the like are carried out in sequence.

In a specific embodiment of the present invention, in the dyeing process, hydrogen peroxide is used in the first heat preservation stage (85-90°C, heat preservation for 10-30 minutes) and the second heat preservation stage (85-90°C, heat preservation for 10-30 minutes) minutes) added slowly between. In addition, the temperature needs to be lowered when hydrogen peroxide is added. Preferably, the temperature of the dye solution is lowered by 70-80° C., and then the temperature is raised to 85-90° C. after slowly adding hydrogen peroxide.

A specific embodiment of the brightening dyeing method of wool knitted fabric of the present invention, comprises the following steps:

(1) Pre-treatment process: inject water into the dyeing machine at a bath ratio of 1:15-20, add wool knitted fabric, and circulate for 5-20 minutes; then add detergent, heat up to 50-90°C, and keep warm for 15 minutes. -30 minutes, then cool down to below 60°C, discharge the lotion;

(2) Dyeing process: inject water into the dyeing machine according to the bath ratio of 1:15-20, and circulate for 5-20 minutes; add Glauber's salt, pH regulator, lubricant in the bath, leveling agent, hydrogen peroxide activator, Raise the temperature to 35-40°C, then add the dye, and the aqueous solution at this time is the dye solution; raise the temperature of the dye solution to 85-90°C, and after the first stage of heat preservation for 10-30 minutes, add hydrogen peroxide, and then carry out the second stage of heat preservation 10-30 minutes, then lower the temperature to below 60°C, and discharge the dye liquor;

Wherein, the amount of Glauber's salt is 5-10% of the weight of the wool knitted fabric. The dosage of the leveling agent is 1-2% of the weight of the wool knitted fabric.

(3) Cleaning process: Add water to the dyeing machine, heat up to 50-80°C, keep warm for 10-30 minutes, cool down, drain the lotion, and finally wash with cold water (20-30°C) until the water is clear and the cloth is ready.

The inventors found that in the pretreatment process of the method of the present invention, after adding the cleaning agent and before heating up, adding soda ash to adjust the pH of the solution to be alkaline, the effect of removing grease on the fabric is better.

In a specific embodiment of the present invention, the amount of detergent used in the pretreatment process is preferably 1-2 g per 1 liter of water.

In a preferred embodiment of the present invention, the dosages of the pH regulator, lubricant in the bath, and hydrogen peroxide activator in the dyeing process are respectively 0.5-2g, 1-3g, and 1-8g per 1 liter of water; more preferably, the dyeing process The consumption of the 35% hydrogen peroxide added midway is 5-10g in every 1 liter of water.

The hydrogen peroxide activator described in the dyeing process of the method of the present invention is a kind of organic salt solution, preferably commercially available PO brightening agent. The hydrogen peroxide activator can form peroxide with hydrogen peroxide, and the combination of hydrogen peroxide under acidic conditions can not only significantly improve the bleaching effect, but also make the amount of hydrogen peroxide significantly lower than that of the traditional wool bleaching process. The purpose of this improvement is to Maximize the protection of the physical strength of the wool fiber.

The dyestuff described in the dyeing procedure of the inventive method is the acid dyestuff commonly used in this area, preferred Huntsman company's Elinier series dyestuff (the dyestuff of all models under this series of dyestuff, property is similar, can be used for the present invention) . The use of Elinier A series dyes can make wool knitted fabrics have excellent color fastness and high dye uptake. The amount of the dyestuff is adjusted according to the desired color, usually a medium-light color, and those skilled in the art can easily determine the amount according to specific needs.

Since the bright colors are mostly medium and light colors, appropriately lowering the dyeing temperature can also ensure the ideal dyeing yield. At the same time, lowering the dyeing temperature can also play a positive role in protecting the physical strength of wool. Generally, the conventional wool dyeing temperature is 99°C. In a preferred embodiment of the present invention, the wool dyeing temperature in the dyeing process is lowered to 85-90°C.

In another preferred embodiment of the present invention, in the dyeing process, the specific operation procedure of the dye liquor heating process is as follows: after adding the dye, the temperature is first raised to 50-60°C, and the heating process is preferably 10-20 minutes Complete within 10-20 minutes of heat preservation; then raise the temperature to 85-90°C, this heating process is completed within 15-30 minutes, and then carry out the first stage of heat preservation for 10-30 minutes; the temperature of the dyeing solution drops back to 70-80°C, After slowly adding hydrogen peroxide, heat preservation cycle for 5-10 minutes; then the temperature rises to 85-90°C, this heating process is completed within 5-20 minutes, and the second stage of heat preservation is carried out for 10-30 minutes.

In a preferred embodiment of the brightening dyeing method of the present invention, the water used in steps (1), (2) and (3) all refers to industrial soft water, and the selected dyeing machine is an overflow or jet dyeing machine.

In the method of the present invention, the detergent, pH regulator, lubricant in the bath, leveling agent, etc. are all commonly used auxiliaries in the technical field, and there is no special limitation on this.

In the method of the present invention, the "water" used in the water, water washing, etc. all refer to industrial soft water commonly used in this field, and those skilled in the art can easily determine the amount of water used.

The brightening dyeing method of the wool knitted fabric of the present invention is easy to operate, requires less equipment and saves time; the hydrogen peroxide consumption in the dyeing method of the present invention is obviously lower than that in the traditional bleaching process. The knitted wool fabric dyed by the method of the present invention has a remarkable brilliance, although compared with the traditional wool dyeing process, the increase in brilliance will be different due to different dyes. However, when the same dye is used, compared with the conventional wool dyeing process, the wool knitted fabric dyed by the present invention has obvious improvement in color brightness, and the color brightness brightness is as high as 20%. Simultaneously, the bleaching of the inventive method has very little influence on the physical strength of the wool knitted fabric, the physical strength of the wool knitted fabric treated by the inventive method is maintained at a good level, and the wear-resistant strength loss can be controlled within 8%. Burst strength is almost unchanged. The strength of the wool knitted fabric is effectively protected, and it can fully meet the normal wearing conditions.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

The brightening agent used in the examples is PO brightening agent purchased from Germany Duowen Company.

Example 1

A wool knitted fabric, in a jet dyeing machine, the method for dyeing it comprises the steps:

1) Pretreatment process: Inject 612 liters of industrial soft water into the dyeing machine, put 41 kg of wool knitted fabric into the dyeing machine and circulate it for 10 minutes. Add 612g of Sima DEPICOL JT, 326g of soda ash, run for 10 minutes, heat up to 60°C, keep warm for 15 minutes, then cool down to below 60°C, drain the lotion, and wash in cold water for 10 minutes;

2) Dyeing process: inject 612 liters of industrial soft water into the dyeing machine, and after 10 minutes of circulating operation, add Glauber's salt 2040g, Shandeic acid VS 612g, Yuzhongbao C 1224g, Abaig SET 408g, PO brightening agent 1530g , run for 10 minutes, and heat up to 40°C; then slowly add the dye solution (the dye solution contains dye T/BLUE A-G 62g) mixed with water into the dyeing machine slowly, the adding time is 15 minutes, and the temperature is raised to 85°C, carry out the first stage of heat preservation for 20 minutes; then the temperature of the dye solution drops to 70°C, slowly add 3672g of 35% hydrogen peroxide, heat preservation cycle for 10 minutes, the temperature rises to 85°C within 15 minutes, and carry out the second stage of heat preservation for 20 minutes Minutes; finally cool down to below 60°C and discharge the dye liquor;

3) Cleaning process: Add 612 liters of industrial soft water into the dyeing machine, raise the temperature to 60°C, keep it warm for 20 minutes, then cool down, drain the lotion, wash with cold water at 20°C until the cloth is clear;

After the fabric comes out of the vat, it enters the post-finishing process, which successively includes the steps of anti-insect finishing in the bath, dehydration, drying, and inspection of softness and shaping.

After testing, the wear-resistant strength loss of the wool knitted fabric is 4.1%, and the bursting strength is almost unchanged. The brightness-enhancing dyeing method of the present invention is the most remarkable in the degree of brightness-enhancement of the bright blue color of the cloth surface of wool knitted fabrics. The boost was 21%.

Comparative example:

A traditional dyeing method for wool knitted fabrics, in a jet dyeing machine, the dyeing method using the same dyestuff as in Example 1 includes a pretreatment process, a dyeing process, and a cleaning process. Wherein, the pretreatment process and the cleaning process of the method are the same as in Example 1, and the specific operations of the dyeing process are:

Dyeing process: Inject 612 liters of industrial soft water into the dyeing machine, circulate for 10 minutes, add Glauber’s salt 2040g, Shandeic acid VS 612g, Yuzhongbao C 1224g, Abaig SET 408g, run for 10 minutes, heat up to 40°C, Add the dye solution evenly mixed with water (the dye solution contains dye T/BLUE A-G 62g), slowly add it into the dyeing machine for 15 minutes, heat up to 99°C after running for 10 minutes, keep it warm for 30 minutes, and then cool down to Below 60°C, discharge the dye solution.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims (3)

1. A brightening dyeing method for wool knitted fabrics, comprising a pretreatment process, a dyeing process and a cleaning process, characterized in that the dyeing process comprises an oxygen bleaching process and a dyeing process, and the oxygen bleaching process and the dyeing process are simultaneously ongoing: (1) Pre-treatment process: inject water into the dyeing machine at a bath ratio of 1:15-20, add wool knitted fabric, and circulate for 5-20 minutes; add detergent, the amount of detergent is 1 Add 1-2g of water, add soda ash to adjust the pH to be alkaline, heat up to 50-90°C, keep warm for 15-30 minutes, then cool down to below 60°C, and discharge the lotion; (2) Dyeing process: inject water into the dyeing machine at a liquor ratio of 1:15-20, and run it in a cycle for 5-20 minutes; add Glauber's salt, pH regulator Shandeic acid VS, lubricant in the bath, leveling agent, hydrogen peroxide Activator, heat up to 35-40°C; then add dye, heat up to 85-90°C, keep warm for 10-30 minutes, add hydrogen peroxide, keep warm at 85-90°C for 10-30 minutes; then cool down to below 60°C, discharge Dyeing liquor, the pH regulator Shandeic acid VS, the lubricant in the bath, the consumption of hydrogen peroxide activator are respectively 0.5-2g, 1-3g, 1-8g per 1 liter of water, and the consumption of described Glauber's salt is the wool 5-10% of the weight of the knitted fabric, the amount of the leveling agent is 1-2% of the weight of the wool knitted fabric; The specific procedure for raising the temperature of the dye solution in the dyeing process is as follows: after adding the dye, first raise the temperature to 50-60° C. within 10-20 minutes, keep it warm for 10-20 minutes, and then raise the temperature to 85-85° C. within 15-30 minutes. 90°C, carry out the first stage of heat preservation for 10-30 minutes; the temperature of the dyeing solution drops to 70-80°C, after slowly adding hydrogen peroxide, the amount of hydrogen peroxide is 5-10g per 1 liter of water, and the heat preservation cycle is 5-10 minutes , the temperature rises to 85-90°C within 5-20 minutes, and the second stage of heat preservation is carried out for 10-30 minutes; (3) Cleaning process: Add water into the dyeing machine, heat up to 50-80°C, keep warm for 10-30 minutes, then cool down, drain the lotion, and then wash with cold water until the cloth is clear. 2. the brightening dyeing method of wool knitted fabric as claimed in claim 1, is characterized in that, described hydrogen peroxide activator is PO brightening agent. 3. the brightening dyeing method of wool knitted fabric as claimed in claim 1, is characterized in that, described dyestuff is the acid dyestuff of Ilinier series.