CN103215656B - Solvent Carrier Dope Dyeing Process of Polyester Fiber - Google Patents

Abstract

The solvent carrier pre-spinning solution dyeing process of polyester fiber belongs to the field of chemical fiber production. It includes the following steps: 1) mixing the dye and the solvent carrier into a uniform dye solution for pre-spinning solution dyeing; 2) injecting the dye solution into the polyester melt in the pipeline through a metering injection device and stirring; 3) uniformly mixing the polyester melt and the dye solution through a mixing component; 4) after mixing, entering the melt metering device, and after metering, sending it to the spinning component for spinning. The solvent carrier pre-spinning solution dyeing technology has the advantages of no pollution, environmental protection and energy saving compared with the matrix coloring method due to the short production process and low dye solution preparation temperature (≤150℃).

Description

Solvent Carrier Dope Dyeing Process of Polyester Fiber

technical field

The invention relates to a solvent carrier dope coloring process for polyester fibers before spinning, which belongs to the field of chemical fiber production.

Background technique

At present, the coloring technology of polyester fiber mainly adopts the matrix coloring method, that is, a certain proportion of colored chips is mixed into the natural color chips. In short, 30% pigment (dye) powder and 70% polyester powder are mixed and granulated. , to produce a "color masterbatch", which is melted together with the natural color chips during spinning and input to the spinning machine to directly spin colored fibers. This method is the main process route used in the production of colored silk at present. Its advantages are: less staining on equipment, easy to use, and easy to change colors. However, it is necessary to manufacture "color masterbatch" made of pigment powder and polyester powder as raw materials, and add the ratio of color masterbatch during spinning to realize coloring of stock solution and produce colored silk. Its disadvantages are: in the melt direct spinning production line, it is difficult to realize small batch and multi-variety production; when changing varieties, more raw materials will be consumed to clean up the staining equipment; High-temperature processing (masterbatch manufacturing and pre-spinning melting), so there are certain restrictions on the requirements for dyes and the brightness of the product; in addition, a certain amount of consumption and environmental impact will also occur during the production of masterbatches. pollute.

Contents of the invention

In view of the defects existing in the prior art, the purpose of the present invention is to provide a solvent carrier pre-spinning dope coloring process for polyester fibers. On the basis of the existing pre-spinning dope coloring, a new solvent carrier pre-spinning dope coloring technology is used to produce colored silk.

In order to achieve the above object, the technical solution adopted in the present invention is: solvent carrier pre-spinning dope coloring process of polyester fiber, which is characterized in that it includes the following steps: 1) blending the dye and solvent carrier into a uniform pre-spinning dosing Colored dye stock solution; 2) Inject the dye stock solution into the polyester melt in the pipe through the metering injection device and stir it; 3) Mix the polyester melt and the dye stock solution evenly through the mixing component; 4) After mixing It enters the melt metering device, and after metering, it is sent to the spinning assembly for spinning. The solvent carrier is polyester polyol. The weight ratio of dye to polyester polyol is 1:2~1:15. The dye stock solution is injected into the polyester melt in the pipeline, the temperature of the dye stock solution is 60~150°C, and the stirring speed is 300~1000rpm. The mixing assembly is a mixing element with several sets of static mixers. The metering injection device is several groups of metering injection pumps, each group of metering injection pumps corresponds to a set of mixing components, and the dye stock solutions in the several groups of metering injection pumps are the same or different dye stock solutions.

After adopting the above scheme, compared with the prior art, it has the following beneficial effects: the main characteristics of the solvent carrier dope coloring technology before spinning:

(1) Compared with the existing dope coloring method, it has greater flexibility: on the existing spinning production line (chip spinning or direct spinning), the dye stock solution injection device and mixing elements are equipped to make polyester After the melt is uniformly mixed with the dye stock solution of the solvent carrier, it enters the melt metering device to realize multi-variety and multi-color production on the production line.

(2) Variety replacement is simple and easy; through the deployment of different dye solutions, adding them to the metering injection device, the pipeline cleaning material required for the replacement of varieties is less than that of the parent coloring method, and the reaction is faster.

(3) The fiber color is more vivid: the residence time of the dye under high temperature conditions is shorter than that of the existing dope coloring technology (only after one high-temperature treatment, and the residence time is shorter), so the dye with the same content, its color More vivid, higher color fastness and weather resistance than the parent coloring method.

(4) Using solvent carrier dope dyeing technology before spinning, due to the short production process and low dye solution mixing temperature (≤150°C), compared with the matrix coloring method, it has the advantages of no pollution, environmental protection, and energy saving.

detailed description

Polyester polyol is used as a dye solvent carrier, which has good dye solubility, and dyes have good solubility and high temperature resistance in polyester polyol. At the same time, it also has good miscibility with polyester melt.

Example 1:

Dye: The solvent is 1:8 (weight ratio) to prepare the dye stock solution that can be used for the coloring of the pre-spinning stock solution. Through the injection device, a certain proportion of the dye stock solution is evenly injected into the polyester melt in the pipeline. The temperature of the dye stock solution is 100° C., and the stirring speed is 400 rpm. The mixture of polyester melt and dye stock solution passes through the mixing element with several groups of static mixers to uniformly mix the dye and polyester melt. The metering injection device is several groups of metering injection pumps, each group of metering injection pumps corresponds to a set of mixing components, and the dye stock solutions in the several groups of metering injection pumps are the same dye stock solution. After accurate metering by the melt metering pump, it is sent to the spinning assembly for spinning to produce colored silk. After testing, the dye content in the fiber is 0.5%, and the performance and indicators of the colored fiber are in line with the national standard.

Example 2:

Dye: The solvent is 1:6 (weight ratio) to prepare the dye stock solution that can be used for the coloring of the pre-spinning stock solution. Through the injection device, a certain proportion of the dye stock solution is evenly injected into the polyester melt in the pipeline. The temperature of the dye stock solution is 150° C., and the stirring speed is 600 rpm. The mixture of polyester melt and dye stock solution passes through the mixing element with several groups of static mixers to uniformly mix the dye and polyester melt. The metering injection device is several groups of metering injection pumps, each group of metering injection pumps corresponds to a set of mixing components, and the dye stock solutions in the several groups of metering injection pumps are the same dye stock solution. After accurate metering by the melt metering pump, it is sent to the spinning assembly for spinning to produce colored silk. After testing, the dye content in the fiber is 0.8%, and the performance and indicators of the colored fiber are in line with the national standard.

Example 3:

Dye: The solvent is 1:3 (weight ratio) to prepare the dye stock solution that can be used for the coloring of the pre-spinning stock solution. Through the injection device, a certain proportion of the dye stock solution is evenly injected into the polyester melt in the pipeline. The temperature of the dye stock solution is 100° C., and the stirring speed is 700 rpm. The mixture of polyester melt and dye stock solution passes through the mixing element with several groups of static mixers to uniformly mix the dye and polyester melt. The metering injection device is a plurality of sets of metering injection pumps, each set of metering injection pumps corresponds to a set of mixing components, and the dye stock solutions in the several sets of metering injection pumps are dye stock solutions prepared from different dyes. After accurate metering by the melt metering pump, it is sent to the spinning assembly for spinning to produce colored silk. After testing, the dye content in the fiber is 1%, and the performance and indicators of the colored fiber are in line with the national standard.

The use of solvent carrier dope coloring technology before spinning can save the production process of downstream printing and dyeing enterprises for fiber products, and greatly reduce the printing and dyeing chemical enterprises from the source of pollution, so that energy consumption can be reduced and production costs can be greatly reduced; The variety replacement is simple and easy, so the existing large-scale melt direct spinning production line can be fully utilized. On the basis of the existing production line, through the transformation of part of the melt conveying pipeline or parts, the production difference in the large-scale production line can be realized. Chemical fiber, which solves the problem that it is difficult to achieve multi-variety differentiation in large-scale production lines. The development and application of this technology has opened up a new way to control pollution and protect the environment from the source of the industry and the source of pollution for the production of non-ferrous (differentiated) polyester fibers in my country; Diversification of product varieties, reduction of production costs, and improvement of product differentiation rate have played a driving role.

Claims (3)

1. Solvent carrier pre-spinning dope coloring process of polyester fiber, which is characterized in that it includes the following steps: 1) blending dyes and solvent carriers into a uniform dye stock solution for pre-spinning dope coloring, and the solvent carrier is polyester polyol ;2) Through the metering injection device, inject the dye stock solution into the polyester melt in the pipeline and stir it; 3) Mix the polyester melt and the dye stock solution evenly through the mixing component; 4) Enter the melt metering after mixing The device, after metering, is sent to the spinning assembly for spinning; the weight ratio of dye and polyester polyol is 1:2~1:15; the dye stock solution is injected into the polyester melt in the pipeline, and the temperature of the dye stock solution is 60~ 150°C, the stirring speed is 300~1000rpm. 2. The solvent-carrier pre-spinning dope coloring process for polyester fiber according to claim 1, characterized in that: the mixing component is a mixing element with several sets of static mixers. 3. The solvent carrier dope coloring process of polyester fiber according to claim 1, characterized in that: the metering injection device is several groups of metering injection pumps, each group of metering injection pumps corresponds to a set of mixing components, and several groups The dye stock solutions metered into the pump are the same or different dye stock solutions.