阅读说明：本技术 涤纶织物的拔染助剂、印花浆和拔染印花方法 (Discharge assistant, printing paste and discharge printing method for polyester fabric ) 是由 梅立斌 于 2019-09-11 设计创作，主要内容包括：本发明提供一种涤纶织物的拔染助剂,包括以下重量百分含量的组分：去离子水50-73％；磷酸：1-5％；还原剂：15-25％；乳化剂：1-5％；增稠剂：10-15％；涤纶织物的印花浆,包括上述拔染助剂94-100％、P型分散染料：0-6％。本发明还提供一种涤纶织物的拔染印花方法,包括以下步骤：(1)印花浆印制：将印花浆在已染色的涤纶织物表面印形成具有颜色的图案；(2)蒸化：所述还原剂还原涤纶织物表面已上染的原有分散染料；(3)清洗残余印花浆；该工艺简单,节能减耗。本发明的拔染助剂稳定性好,使用该拔染助剂的印花浆能够实现涤纶织物经高温染色后再印花,节能省时；高温染色后再印花得到的涤纶织物,各项牢度优异,拔色印花均匀,且具有柔软和丰满的手感。(the invention provides a discharge auxiliary agent for polyester fabrics, which comprises the following components in percentage by weight: 50-73% of deionized water; phosphoric acid: 1 to 5 percent; reducing agent: 15 to 25 percent; emulsifier: 1 to 5 percent; thickening agent: 10 to 15 percent; the printing paste for the polyester fabric comprises 94-100% of the discharge assistant and P-type disperse dye: 0 to 6 percent. The invention also provides a discharge printing method of the polyester fabric, which comprises the following steps: (1) printing with printing paste: printing the printing paste on the surface of the dyed polyester fabric to form a pattern with color; (2) and (3) steaming: the reducing agent reduces the original disperse dye dyed on the surface of the polyester fabric; (3) cleaning residual printing paste; the process is simple, energy-saving and consumption-reducing. The discharge auxiliary agent has good stability, and the printing paste using the discharge auxiliary agent can realize the printing of the polyester fabric after high-temperature dyeing, thereby saving energy and time; the polyester fabric obtained by printing after high-temperature dyeing has excellent fastness, uniform discharge printing and soft and plump hand feeling.)

1. The discharge auxiliary agent for the polyester fabric is characterized by comprising the following components in percentage by weight:

2. The discharge assistant for polyester fabrics according to claim 1, characterized in that: the reducing agent is one of stannous chloride dihydrate, sodium hydrosulfite, rongalite C, rongalite Z and dacoline.

3. The discharge assistant for polyester fabrics according to claim 1, characterized in that: the emulsifier is naphtha or petroleum spirit.

4. The discharge assistant for polyester fabrics according to claim 1, characterized in that: the thickening agent is one of guar gum, starch thickening agent and tamarind thickening agent.

5. the printing paste for the polyester fabric is characterized by comprising the following components in percentage by weight:

The discharge assistant for polyester fabrics according to any one of claims 1 to 4: 94-100%;

P-type disperse dye: 0 to 6 percent.

6. The discharge printing method of the polyester fabric is characterized by comprising the following steps:

(1) Printing with printing paste: printing the printing paste of claim 5 on the surface of the dyed polyester fabric to form a pattern with color;

(2) And (3) steaming: under the condition of steaming, reducing the original disperse dye dyed on the surface of the polyester fabric by the reducing agent;

(3) Cleaning: and cleaning the steamed polyester fabric.

7. The discharge printing method for polyester fabric according to claim 6, characterized in that step (1) is preceded by the following steps:

Dyeing the polyester fabric; preparing a discharge assistant for the polyester fabric according to any one of claims 1 to 4; printing paste for preparing the polyester fabric according to claim 5.

8. The discharge printing method for the polyester fabric as claimed in claim 7, wherein the method for dyeing the polyester fabric is: and dyeing the polyester fabric by using heterocyclic azo disperse dyes, wherein the dyeing temperature is 125-135 ℃, and the dyeing time is 25-35 minutes.

9. The method for preparing the discharge assistant for polyester fabrics according to claim 6, which is characterized in that: the steaming conditions comprise: the steaming temperature is 165-175 ℃, and the steaming time is 6-10 minutes.

10. The method for preparing the discharge assistant for polyester fabrics according to claim 6, which is characterized in that: and (3) when cleaning, the washing temperature is 75-85 ℃, the washing time is 10-20 minutes, and the dosage of the detergent is as follows: 3-5 g/L.

Technical Field

the invention belongs to the field of textile printing and dyeing, and particularly relates to a discharge auxiliary agent, a printing paste and a discharge printing method for polyester fabrics.

Background

POLYESTER FIBERS (POLYESTER FIBERS), commonly known as "dacron". The PET fiber is a synthetic fiber obtained by spinning polyester formed by polycondensation of organic dibasic acid and dihydric alcohol, is called PET fiber for short, and belongs to a high molecular compound. Invented in 1941, is the first major variety of current synthetic fibers. The polyester fiber has the advantages of good crease resistance and shape retention, high strength and elastic recovery capability. It is firm and durable, has the functions of resisting wrinkle, preventing ironing and preventing hair from sticking. The dyeing of polyester fibers generally requires the use of disperse dyes.

The disperse dye has the following characteristics:

(1) The disperse dye is the most important and main type of nonionic dye in the dye industry, does not contain strong water-soluble groups, and dyes in a disperse state in the dyeing process. The particle fineness is required to be about 1 mu m. After the raw dye is prepared, the commercial dye can be prepared by post-treatment processing, including commercialized treatment such as stable crystal form and grinding together with a dispersing agent. The method is mainly used for printing and dyeing the terylene and the blended fabrics thereof. It can also be used for printing and dyeing synthetic fibers such as acetate fiber, nylon, polypropylene fiber, polyvinyl chloride fiber, acrylic fiber, etc.

(2) The disperse dye has small molecules and contains no water-soluble group structurally, and can be uniformly dispersed in the dye solution by virtue of the action of the dispersant to carry out dyeing. It can dye polyester fiber, acetate fiber and polyamide fiber to become the special dye for terylene.

(3) The disperse dyes can be roughly divided into disperse orange, disperse blue, disperse yellow and disperse red, and several different disperse dyes can be matched according to a certain proportion to obtain disperse dyes such as disperse black, disperse green and disperse violet.

(4) in the commercial processing process of the disperse dye, in order to enable the commercial dye to be rapidly dispersed in water to form uniform and stable colloidal suspension, the fineness of the dye particles must reach about 1 micron, a dispersing agent and a wetting agent are added in the sanding process, and the post-processing of the disperse dye generally comprises sanding, seasoning, spray drying and packaging. In the post-treatment process, a plurality of auxiliary agents are used, such as lignin, MF, an anti-settling agent (SOS), a dust-proof agent and a dispersing agent NNO, and sodium sulfate is added for strength adjustment.

According to the reduction process of the azobenzene disperse dye, the color of a reduction product and the influence of the chemical structure of the disperse dye on the discharge performance of the azobenzene disperse dye, the substituent group at the ortho position of the azo group on the diazo component of the monoazo benzene disperse dye has great influence on the dischargeability of the dye and the color of the reduction product. The extractability of the dye is increased along with the increase of the electron donating capability of the N, N' -substituent on the coupling component; most heterocyclic azo disperse dyes have good extractability, and for example, methine, quinophthalone, aminoketone and benzodifuranone disperse dyes and anthraquinone disperse dyes except individual varieties can be used as flower color dyes of stannous chloride. However, in the case of stannous chloride, stannous chloride used for color discharge needs to be maintained in an aqueous solution, and is easily hydrolyzed and oxidized to lose the color discharge performance, and it is difficult to maintain the stability of the discharge assistant in the conventional process. The traditional reducing agent has the defect of poor stability, so that the conventional discharge auxiliary agent fails in a short period, or the discharge force is limited and the discharge is uneven during discharge printing, so that the surface quality of the fabric is poor. Therefore, in the conventional process, long car padding is generally used, so that the disperse dye temporarily stays on the surface of the polyester fabric in a van der waals force action mode and is not sublimated to the interior of the fiber, and then the reducing agent is printed for stripping. This approach requires extra control over the uniformity and humidity of padding, which can result in uneven color and thus affect the quality of the fabric.

Therefore, the method of dyeing at high temperature and then discharging is adopted, so that the discharge printing of the dyed fabric has no internal and external difference after the ground color is dyed, the ground color is uniform, and the product has a high-grade image, which is a difficult problem at present.

Disclosure of Invention

based on the above, the invention aims to provide the discharge auxiliary agent for the polyester fabric, which has good stability, and the discharge auxiliary agent can realize the purpose that the polyester fabric is printed after being dyed at high temperature, thereby saving energy and time; the polyester fabric obtained by printing after high-temperature dyeing has excellent fastness, uniform discharge printing and soft and plump hand feeling.

The technical scheme adopted by the invention is as follows:

The discharge auxiliary agent for the polyester fabric is characterized by comprising the following components in percentage by weight:

The invention is used as the discharge assistant of the polyester fabric by compounding the reducing agent, the phosphoric acid, the emulsifier and the like, and can be stable and effective for a long time, so that the invention can be applied to printing after the polyester fabric is dyed at high temperature. The use of phosphoric acid controls the overall pH value of the discharge assistant to be 1-3, avoids the strong corrosivity caused by volatilization when hydrochloric acid is used or sulfuric acid, nitric acid and the like are used, and the selection of the emulsifier enables the reducing agent to exist in a water-in-oil mode in a system, reduces the contact with air and greatly improves the overall stability of the discharge assistant; the combination of the phosphoric acid and the emulsifier can also enhance the capability of damaging the dyed disperse dye at high temperature, and the elastic fiber can not be damaged, so that the original elasticity of the fabric is maintained; by adopting the formula, the viscosity of the discharge auxiliary agent of the polyester fabric can be controlled to be 20000 +/-500 cps, so that the polyester fabric is convenient to print during subsequent printing, and patterns obtained by printing are clear. Therefore, the discharge auxiliary agent can be used for dyeing the polyester fabric at high temperature without padding process of long-distance vehicle equipment, so that the energy-saving and environment-friendly implementation process is realized, and then the discharge process is carried out according to the personalized patterns; meanwhile, after the textile is treated by the printing paste prepared by the discharge auxiliary agent, the textile can be endowed with soft and plump hand feeling, so that the discharge process of the polyester textile is changed from the traditional limit of difficult control, large equipment investment and energy consumption into a simple process which saves energy and time, and the phenomenon of various defects caused by padding is avoided.

Further, the reducing agent is one of stannous chloride dihydrate, sodium hydrosulfite, rongalite C, rongalite Z and dacoline. Among them, especially when the reducing agent is stannous chloride dihydrate, the influence on the effect of discharge printing is most obvious.

further, the emulsifier is naphtha or petroleum spirit.

Further, the thickening agent is one of guar gum, starch thickening agent and tamarind thickening agent.

The invention also provides printing paste for polyester fabrics, which is characterized by comprising the following components in percentage by weight:

The discharge auxiliary agent of the polyester fabric comprises the following components: 94-100%;

P-type disperse dye: 0 to 6 percent.

The invention also provides a discharge printing method of the polyester fabric, which is characterized by comprising the following steps:

(1) Printing with printing paste: printing the printing paste on the surface of the dyed polyester fabric to form a pattern with color;

(2) and (3) steaming: under the condition of steaming, reducing the original disperse dye dyed on the surface of the polyester fabric by the reducing agent;

(3) cleaning: and cleaning the steamed polyester fabric.

the printing paste prepared by the discharge assistant for the polyester fabric is used for discharge printing of the dyed polyester fabric, so that the discharge printing process can be simplified, the energy consumption is reduced, and the time is saved.

Further, step (1) is preceded by the following steps:

Dyeing the polyester fabric; preparing the discharge assistant of the polyester fabric; preparing the printing paste of the polyester fabric.

further, the method for dyeing the polyester fabric comprises the following steps: and dyeing the polyester fabric by using heterocyclic azo disperse dyes, wherein the dyeing temperature is 125-135 ℃, and the dyeing time is 25-35 minutes.

Further, the steaming conditions include: the steaming temperature is 165-175 ℃, and the steaming time is 6-10 minutes.

Further, the washing temperature in the step (3) is 75-85 ℃, the washing time is 10-20 minutes, and the dosage of the detergent is as follows: 3-5 g/L.

the invention has the beneficial effects that:

(1) The invention uses the compounding of the reducing agent, the phosphoric acid, the emulsifier and the like as the discharge auxiliary agent of the polyester fabric, and can realize the technology of printing the polyester fabric after high-temperature dyeing under the combined action. On one hand, the discharge auxiliary agent has long-term stability, so that the discharge capability is kept stable; on the other hand, the compounded discharge auxiliary agent can enhance the capability of destroying the dyed disperse dye at high temperature, does not destroy elastic fibers, and keeps the original elasticity of the fabric; on the other hand, the discharge assistant is convenient to print after being prepared into printing paste, patterns obtained by printing are clear, various fastness of printing on polyester fabrics is excellent, and particularly, the discharge assistant shows a better performance effect on fabrics of sports clothes.

(2) The discharge assistant can be prepared into Printing paste with P-type disperse dye (P is Printing, P is disperse dye suitable for Printing), the Printing paste can be used for Printing the polyester fabric dyed at high temperature, and the fabric can be endowed with soft and plump hand feeling.

(3) the invention changes the existing discharge printing method, and changes the traditional limitation of difficult control, large equipment investment and energy consumption into a simple process with energy and time saving, thereby realizing the beneficial effect of avoiding various defects caused by padding.

Detailed Description

For a better understanding and practice, the invention is described in detail below with reference to specific embodiments.