One-bath dyeing process for dark polyester cotton cloth

Abstract

The invention relates to a one-bath dyeing process for dark polyester cotton cloth, which comprises the following steps of: firstly, screening dye and fabric, and simultaneously coloring polyester and cotton fiber by the screened dye under a neutral condition; then appropriate fabric is screened out, and disperse dye capable of coloring under the neutral or weak acid condition is adopted for polyester; for cotton fibers, reactive dye with good performance under a neutral condition is adopted; under the normal temperature condition, the screened fabric is put into a dye bath, industrial salt, a DH value regulator and an alkali-free reactive dye are sequentially added into the dye bath, then the temperature is gradually increased to the dyeing temperature, and heat preservation is conducted at the temperature; after the fabric dyeing procedure is completed, cooling, soaping and water washing are conducted, and finally the dyed fabric is detected. Dacron dyeing and cotton dyeing are combined into one step, the technological process is greatly simplified, the production efficiency is improved, meanwhile, due to the fact that only one-time dyeing is needed, energy consumption and water consumption are remarkably reduced, and the requirements for environmental protection, energy conservation and consumption reduction are met; the dyeing is uniform and stable.

Description

Technical Field

[0001] The invention relates to the technical field of cloth dyeing, in particular to a one-bath dyeing process for polyester-cotton dark-colored cloth. Background Art

[0002] With the rapid development of the textile industry and the intensification of market competition, textile enterprises are facing severe challenges, mainly focusing on how to reduce production costs, improve product quality and production efficiency. Especially in the polyester-cotton dyeing process, the traditional process exposes significant problems such as huge water consumption, long production cycle, high energy consumption and frequent fluctuations in fabric quality. Knitted fabrics, as a polyester-cotton fabric with a cotton content equal to or not more than 50%, are widely loved by consumers because of their advantages such as crisp wrinkle resistance, strong wear resistance, moisture absorption and breathability, softness and comfort, so their share in the textile and clothing fabric market is also increasing. However, the conventional dyeing process of knitted fabrics, namely the disperse / active two-bath dyeing, has problems such as long time consumption, low efficiency, large water, electricity and gas consumption, high wastewater chromaticity value, and difficult treatment. This is far from the current national advocacy of energy conservation, emission reduction and clean production concepts.

[0003] In order to solve the problems existing in the above traditional processes, the new alkali-free reactive dye one-bath method for dyeing knitted fabrics can be considered in theory. This method can theoretically make up for the shortcomings of the traditional two-bath method, but it faces some challenges in practical applications. The main reason is the difference in dyeing process conditions between reactive dyes and disperse dyes, which leads to the problem of color spots (spots), low dark color fastness, and insufficient fabric effect after one-bath dyeing. In the face of the three core development directions of environmental protection, high efficiency, and quality in the textile industry, the research and development of new processes is particularly urgent. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a one-bath dyeing process for polyester-cotton dark-colored fabrics to solve the problems in the above-mentioned background technology.

[0005] The technical problem solved by the present invention is achieved by adopting the following technical solutions: A one-bath dyeing process for polyester-cotton dark-colored fabrics, the specific steps are as follows: 1) Screening of dyes and fabrics In order to ensure the uniformity and color fastness of dark dyeing, it is necessary to solve the compatibility problem between dyes and fabric fibers. First, the appropriate dyes must be screened out. The selected dyes must be able to color both polyester and cotton fibers under neutral conditions; then the appropriate fabrics are screened out; For polyester, use disperse dyes that can be colored under neutral or weakly acidic conditions; for cotton fibers, choose reactive dyes that perform well under neutral conditions; 2) Dyeing Under normal temperature conditions, the fabrics selected in step 1) are placed in a dye bath, and industrial salt, DH value regulator and alkali-free reactive dye are added to the dye bath in sequence, and then the temperature is gradually raised to the dyeing temperature, and kept at this temperature for a period of time to enable the dye to fully penetrate into the fabric fibers; The dyeing process parameters are: temperature 110°C, holding time 5 minutes, the temperature determines the activity of the dye molecules, and the holding time is used to ensure that the dye is fully in contact with the fabric fibers, thereby improving the uniformity and depth of dyeing; 3) Cooling After the fabric dyeing process in step 2) is completed, the temperature is cooled for 5 minutes at a temperature of 65°C; 4) Soaping After the cooling treatment in step 3) is completed, the fabric is soaped with 10% soda ash and 90% soda ash. The soaping process parameters are: temperature: 65°C, the soaping time with 10% soda ash is 25 minutes, and the soaping time with 90% soda ash is 20 minutes; 5) Washing After the soap washing in step 4) is completed, the temperature is lowered to 60°C and water washing is performed for 30 minutes; 6) Performance testing The washed fabrics are tested for color fastness and level dyeing performance to ensure that the dyeing effect meets the requirements. Beneficial Effects

[0006] 1) The energy-efficient dyeing process of the present invention can effectively reduce energy consumption by 20% and improve production efficiency by 30% by optimizing process parameters and equipment operation; 2) The present invention can improve the dyeing effect, realize dark and uniform dyeing of knitted fabrics, and has excellent color fastness (above grade 4) and brightness; 3) The present invention is environmentally friendly and sustainable, effectively reducing wastewater discharge (more than 20%) and the use of chemical substances, and meets environmental protection requirements; 4) The present invention can provide personalized dyeing solutions and provide customized dyeing process solutions according to the requirements of different customers on color and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a process diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0008] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments.

[0009] A one-bath dyeing process for polyester-cotton dark-colored fabrics, the specific steps are as follows: 1) Screening of dyes and fabrics In order to ensure the uniformity and color fastness of dark dyeing, it is necessary to solve the compatibility problem between dyes and fabric fibers. First, the appropriate dyes must be screened out. The selected dyes must be able to color both polyester and cotton fibers under neutral conditions; then the appropriate fabrics are screened out; For polyester, choose disperse dyes that can be colored under neutral or weakly acidic conditions; for cotton fibers, choose reactive dyes that perform well under neutral conditions; 2) Dyeing Under normal temperature conditions, the fabrics selected in step 1) are placed in a dye bath, and industrial salt, DH value regulator and alkali-free reactive dye are added to the dye bath in sequence, and then the temperature is gradually raised to the dyeing temperature, and kept at this temperature for a period of time to enable the dye to fully penetrate into the fabric fibers; The dyeing process parameters are: temperature 110°C, holding time 5 minutes, the temperature determines the activity of the dye molecules, and the holding time is used to ensure that the dye is fully in contact with the fabric fibers, thereby improving the uniformity and depth of dyeing; 3) Cooling After the fabric dyeing process in step 2) is completed, the temperature is cooled for 5 minutes at a temperature of 65°C; 4) Soaping After the cooling treatment in step 3) is completed, the fabric is soaped with 10% soda ash and 90% soda ash. The soaping process parameters are: temperature: 65°C, the soaping time with 10% soda ash is 25 minutes, and the soaping time with 90% soda ash is 20 minutes; 5) Washing After the soap washing in step 4) is completed, the temperature is lowered to 60°C and water washing is performed for 30 minutes; 6) Performance testing The washed fabrics are tested for color fastness and level dyeing performance to ensure that the dyeing effect meets the requirements.

[0010] In this embodiment, the dyeing of polyester and cotton is combined into one step, which greatly simplifies the process flow and improves production efficiency. At the same time, since only one dyeing is required, energy consumption and water consumption are significantly reduced, and the consumption of water, electricity and steam is reduced by 20% to 25%, and the amount of sewage discharge is also reduced, which meets the requirements of environmental protection and energy saving and consumption reduction. The use of selected dyes and auxiliaries can meet the dyeing needs of polyester and cotton in one dyeing, with less damage to the fibers and a more uniform and stable dyeing effect; Compared with traditional processes, it effectively simplifies the process and improves production efficiency.

[0011] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0012] At the same time, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0013] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A one-bath dyeing process for polyester-cotton dark-colored fabrics, characterized in that: The specific steps are as follows: 1) Screening of dyes and fabrics First, select suitable dyes that can color both polyester and cotton fibers under neutral conditions; then select suitable fabrics; For polyester, disperse dyes that can be colored under neutral or weakly acidic conditions are used; for cotton fibers, reactive dyes that perform well under neutral conditions are used; 2) Dyeing Under normal temperature conditions, the fabric selected in step 1) is placed in a dye bath, and industrial salt, DH value regulator and alkali-free reactive dye are added to the dye bath in sequence, and then the temperature is gradually raised to the dyeing temperature, and kept at this temperature for a period of time to enable the dye to fully penetrate into the fabric fiber; 3) Cooling After the fabric dyeing process in step 2) is completed, a cooling treatment is performed; 4) Soaping After the cooling treatment in step 3) is completed, the fabric is soaped with 10% soda ash and 90% soda ash; 5) Washing After the soap washing in step 4) is completed, the temperature is lowered again and then washed with water; 6) Performance testing The washed fabrics are tested for color fastness and level dyeing performance to ensure that the dyeing effect meets the requirements.

2. A one-bath dyeing process for polyester-cotton dark-colored fabrics according to claim 1, characterized in that: In step 2), the dyeing process parameters are: temperature 110°C, and holding time 5 minutes.

3. A one-bath dyeing process for polyester-cotton dark-colored fabrics according to claim 1, characterized in that: In step 3), the cooling time is 5 minutes and the temperature is 65°C.

4. A one-bath dyeing process for polyester-cotton dark-colored fabrics according to claim 1, characterized in that: In step 4), the soap washing process parameters are: temperature: 65°C, the soap washing time with 10% soda ash is 25 minutes, and the soap washing time with 90% soda ash is 20 minutes.

5. A one-bath dyeing process for polyester-cotton dark-colored fabrics according to claim 1, characterized in that: In step 5), the washing time is 30 minutes and the temperature is 60°C.

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