A dyeing and finishing process for high amino nylon

Abstract

The invention discloses a dyeing and finishing process of high-amino nylon, which includes a casting process, a desizing process, a predetermined process, a dyeing process and a drying process. In order to avoid the high-amino nylon from having a too fast dyeing rate under the condition of 40°C-50°C, the dyeing process is achieved by a stage acid-base control method. While adding an acid dye auxiliary, the pH value of the cylinder is controlled within the alkaline range of 9.5-10.0, so that the fabric is heated to 50°C in an alkaline environment. When the temperature is raised to 50°C, the pH value of the cylinder is adjusted to 4.0-6.5, and the temperature is slowly raised to 80°C at a heating rate of 0.5°C / min, and the temperature is lowered to room temperature after constant temperature before the cloth is discharged. The dyeing and finishing process of high-amino nylon of the present invention can make the dyed high-amino nylon uniformly colored.

Description

Technical Field

[0001] The invention relates to the technical field of cloth dyeing and finishing, in particular to a dyeing and finishing process of high-amino nylon. Background Art

[0002] Nylon fabric, also known as nylon fabric, is a synthetic fiber. The emergence of nylon (foreign names include nylon, nylon, capron, etc.) has brought a new look to textile fabrics. Its synthesis is a major breakthrough in the synthetic fiber industry. Nylon is the domestic product name of polyamide fiber. There are many varieties of it, but all of them contain amino groups in their molecular structure. The number of amino groups in conventional nylon 6 fabrics is about 40-45, and the number of amino groups in high-amino nylon 6 fabrics can reach more than 70.

[0003] At present, conventional nylon is difficult to meet the requirements on some bright color and dark color fabrics, and there will be problems such as poor fastness. In order to improve the current situation, combined with the nylon dyeing principle, the more amino groups are combined with the dye, the more sufficient the color saturation is. However, since the number of amino groups in high-amino nylon is relatively high, it is easy to produce the influence of color difference and color flower according to the conventional dyeing method. Based on this, the present invention proposes a dyeing and finishing process for improving the uneven coloring of high-amino nylon. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a dyeing and finishing process for high-amino nylon which improves the uneven coloring of high-amino nylon.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] The present invention discloses a dyeing and finishing process of high-amino nylon, which comprises the following steps:

[0007] Step A, blank casting process: the grey fabric is made of 20D-70D high amino nylon fabric;

[0008] Step B, desizing process: passing the grey cloth through a desizing machine for desizing treatment;

[0009] Step C, presetting process: the desizing fabric is preset through a setting machine;

[0010] Step D, dyeing process: put the cloth formed in step C into the overflow dyeing tank for dyeing. The dye is an acid dye. The dyeing process is achieved by a staged acid-base control method, which specifically includes the following steps:

[0011] Step d1, while adding the acid dye auxiliary agent, the pH value of the cylinder is controlled within the alkaline range of 9.5-10.0, so that the fabric is heated to 50°C in an alkaline environment;

[0012] Step d2, when the temperature is raised to 50°C, the pH value of the cylinder is adjusted to 4.0-6.5, and the temperature is slowly raised to 80°C at a heating rate of 0.5°C / min;

[0013] Step d4, after constant temperature, cool down to room temperature and take out the cloth;

[0014] Step E, drying process: drying the cloth dyed in step D.

[0015] Furthermore, step d3 is included between step d2 and step d4, when the temperature reaches 80°C, the temperature is increased to 100°C at a rate of 1°C / min and kept constant for 45min-60min.

[0016] Furthermore, in step C, the predetermined conditions are set as temperature 160° C.-170° C., speed 30 m / min, and overfeed 1%-3%.

[0017] The dyeing and finishing process of high-amino nylon of the present invention further comprises step F, a water splashing process: the dried cloth is passed through a setting machine for water splashing treatment.

[0018] Furthermore, the penetrant of the water splashing process is 20-30G / L, the softener is 1-2G / L, the water splashing agent is 15G / L-30G / L, the setting temperature is 150℃-160℃, the speed is 40m / min-50m / mi, the width is 148cm-150cm, and the overfeed is 1%-3%.

[0019] Furthermore, the softener is a silicone softener, and the water repellent is a weak cationic water repellent.

[0020] Furthermore, in step B, the desizing machine is a 7-slot tight continuous desizing machine.

[0021] After adopting the above structure, the dyeing and finishing process of high-amino nylon of the present invention predetermines the grey cloth in the predetermined process, thereby preventing the grey cloth from shrinking easily during the dyeing process, which causes the density of the fabric to increase too much and leads to color difference between the left, the middle and the right during dyeing. Then, by coordinating the temperature during dyeing and controlling the pH value in the dyeing vat in stages, it is prevented that the dyeing rate of the high-amino nylon fabric is too fast at 40°C-50°C, thereby improving the uniformity of dyeing. DETAILED DESCRIPTION

[0022] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0023] The present invention discloses a dyeing and finishing process for high-amino nylon fabric, which comprises the following steps:

[0024] Step A, blank casting process: the grey fabric is made of 20D-70D high amino nylon fabric.

[0025] Step B, desizing process: the grey cloth is desizing treated by a desizing machine, and a 7-slot compact continuous desizing machine is selected as the desizing machine.

[0026] Step C, preset process: put the desized fabric through the setting machine to set the width to keep stable; the preset conditions are set as temperature 160℃-170℃, speed 30m / min, overfeed 1%-3%. Generally, the dyeing and finishing process of non-elastic grey fabric does not include a preset process. However, due to the relatively large boiling shrinkage of high-amino nylon fabric, it is easy to shrink during dyeing, which increases the density of the fabric and causes color difference on the left, middle and right during dyeing. Therefore, the process of grey fabric setting is controlled.

[0027] Step D, dyeing process: put the fabric after shaping in step C into the overflow dyeing vat for dyeing, and the dye is an acid dye. Since high-amino nylon has more amino groups than conventional nylon 6, it is easy for acid dyes to combine, so the dyeing rate is faster than nylon 6. Under normal circumstances, the dyeing rate of nylon 6 is 10%-15% at a temperature of 40℃-50℃, while the dyeing rate of high-amino nylon is 40%-50% at a temperature of 40℃-50℃. The general dyeing process of nylon is to put the fabric into the vat, add dyes and additives (the pH value of the vat is controlled at about 7.5-8.5). In order to ensure the uniformity of dyeing, it is usually circulated at room temperature for 20min-30min. However, due to the water circulation, the temperature will rise to about 40℃. Under such conditions, the dyeing rate of high-amino nylon reaches 40%-50%, which is not conducive to the uniformity of subsequent dyeing of fabrics. In order to prevent the high amino nylon from having too fast dye uptake at 40°C-50°C and to improve the uniformity of fabric dyeing, the dyeing process of step D is achieved by a staged acid-base control method, which specifically includes the following steps:

[0028] Step d1, while adding the acid dye auxiliary, the pH value of the cylinder is controlled within the alkaline range of 9.5-10.0, so that the fabric is heated to 50°C in an alkaline environment. This can effectively slow down the dyeing rate of high amino nylon at 50°C, and the dyeing rate is about 15%.

[0029] Step d2, when the temperature is raised to 50°C, the pH value of the cylinder is adjusted to 4.0-6.5, and the temperature is slowly raised to 80°C at a heating rate of 0.5°C / min. The uniformity of coloring is ensured by slowly raising the temperature, so as to avoid color spots due to local coloring being too fast.

[0030] Step d3, although the fabric has been almost colored by the process of heating and dyeing in the above step d2, in order to ensure the uniformity of the coloring of the fabric, it is necessary to heat it to 100°C at a rate of 1°C / min and keep it at a constant temperature for 45min-60min.

[0031] Step d4, after maintaining the temperature at 100℃, reduce the temperature to room temperature at full speed and take out the cloth.

[0032] Step E, drying process: drying the dyed cloth on a cylinder.

[0033] Step F, water splashing process: the dried fabric is sprayed with water in a setting machine under the following conditions: IPA (penetrant): 20-30G / L; softener: 1-2G / L; water splashing agent: 15G / L-30G / L; temperature 150℃-160℃, speed 40m / min-50m / min, width 148cm-150cm, overfeed 1%-3%. The softener is a silicone softener, which plays a role in adjusting the feel. The water splashing agent is a weak cationic water splashing agent, which mainly plays a role in preventing the fabric from splashing water.

[0034] The above embodiments do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A dyeing and finishing process for high amino nylon, characterized in that: The following steps are involved: Step A, blank casting process: the grey fabric is made of 20D-70D high amino nylon fabric; Step B, desizing process: passing the grey cloth through a desizing machine for desizing treatment; Step C, presetting process: the desizing fabric is preset through a setting machine; Step D, dyeing process: put the cloth formed in step C into the overflow dyeing tank for dyeing. The dye is an acid dye. The dyeing process is achieved by a staged acid-base control method, which specifically includes the following steps: Step d1, while adding the acid dye auxiliary agent, the pH value of the cylinder is controlled within the alkaline range of 9.5-10.0, so that the fabric is heated to 50° C. in an alkaline environment; Step d2, when the temperature is raised to 50°C, the pH value of the cylinder is adjusted to 4.0-6.5, and the temperature is slowly raised to 80°C at a heating rate of 0.5°C / min; Step d3, when the temperature reaches 80°C, the temperature is raised to 100°C at a rate of 1°C / min and kept constant for 45min-60min; Step d4, after constant temperature, cool down to room temperature and take out the cloth; Step E, drying process: drying the cloth dyed in step D.

2. The dyeing and finishing process of high-amino nylon according to claim 1, characterized in that: In the step C, the predetermined conditions are set as temperature 160° C.-170° C., speed 30 m / min, and overfeed 1%-3%.

3. The dyeing and finishing process of high-amino nylon according to claim 1, characterized in that: The method also includes step F, a water splashing process, in which the dried cloth is passed through a setting machine for water splashing treatment.

4. The dyeing and finishing process of high-amino nylon according to claim 3, characterized in that: The penetrant in the water splashing process is 20-30 g / L, the softener is 1-2 g / L, the water splashing agent is 15 g / L-30 g / L, the setting temperature is 150° C.-160° C., the speed is 40 m / min-50 m / mi, the width is 148 cm-150 cm, and the overfeed is 1%-3%.

5. The dyeing and finishing process of high-amino nylon according to claim 4, characterized in that: The softener is a silicone softener, and the water repellent is a weak cationic water repellent.

6. The dyeing and finishing process of high-amino nylon according to claim 1, characterized in that: In the step B, the desizing machine is a 7-slot tight continuous desizing machine.