Composite polyester fiber for bacteriostatic flow guide cloth as well as preparation method and application of composite polyester fiber

Abstract

The invention discloses a composite polyester fiber for bacteriostatic diversion cloth and a preparation method and application thereof, the composite polyester fiber comprises a skin layer and a core part, the skin layer is formed by melt extrusion of polyester cut particles A, the core part is formed by melt extrusion of polyester cut particles B, the intrinsic viscosity of the polyester cut particles A is 0.64-65 dL / g, the glass transition temperature is 72-75 DEG C, and the melting point is 170-182 DEG C; and the polyester diced particles B are spinning-grade PET polyester diced particles, the intrinsic viscosity is 0.68-0.69 dL / g, and the melting point is 257-259 DEG C. The flow guide cloth prepared from the composite polyester fiber for the bacteriostatic flow guide cloth is low in cost and long in service life, and the operation cost of a filter element is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and specifically relates to an antibacterial composite polyester fiber for a guide cloth, and a preparation method and application thereof. Background Art

[0002] Reverse osmosis technology is based on the principle of reverse osmosis. It uses pressure difference as a driving force to separate the solvent from the solution to achieve the purpose of separation, concentration and purification. This technology has been widely used in many fields such as food, medicine, chemical industry and water treatment, and has become one of the most important means in today's separation science.

[0003] However, when dealing with water sources with high microbial content, the filtration time of the reverse osmosis membrane is short, resulting in poor filtration effect. The filtered water still contains a certain amount of microorganisms such as bacteria and viruses. This not only makes the final water production unable to meet the user's standard requirements, but also, over time, the residual microorganisms in the water will gather and multiply on the surface of the filter components such as the raw water guide cloth, thereby contaminating the membrane and the guide cloth, shortening the service life of the product and increasing the risk of contamination of the filtered water.

[0004] Therefore, improving the antibacterial properties of the guide cloth is of great significance for expanding the application range of the filter membrane and reducing the operating cost, which will bring significant economic benefits. CN118345544 discloses a method for preparing an RO guide cloth with antibacterial properties. The technical solution first uses antibacterial agents such as zinc oxide, sodium hypochlorite and calcium sorbate to prepare antibacterial masterbatch, then uses the masterbatch method to prepare antibacterial polyester filaments, and finally makes the guide cloth through warping and weaving processes. Despite this, the technical solution still has some problems, such as short contact time with water, limited antibacterial effect of the antibacterial agent, and unsatisfactory treatment effect.

[0005] In addition, existing guide fabrics on the market face other challenges, such as low mechanical strength, poor supporting performance, and the internal guide holes are prone to irreversible deformation and slippage when subjected to external forces. These problems seriously affect the filtration effect and guide speed. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a composite polyester fiber for antibacterial guide cloth.

[0007] Another object of the present invention is to provide a method for preparing the above-mentioned antibacterial composite polyester fiber for guide cloth.

[0008] Another object of the present invention is to provide an application of the above-mentioned antibacterial composite polyester fiber for guide cloth.

[0009] The technical solution of the present invention is as follows:

[0010] A composite polyester fiber for antibacterial diversion cloth, comprising a skin layer and a core, wherein the skin layer is formed by melt extrusion of polyester pellets A, and the core is formed by melt extrusion of polyester pellets B.

[0011] Polyester pellets A, with an intrinsic viscosity of 0.64-65 dL / g, a glass transition temperature of 72-75°C, and a melting point of 170-182°C, are prepared by reacting a composite dibasic acid, trimethyl phosphate, ethylene glycol, diethylene glycol, polyethylene glycol, an antibacterial agent, aldohexose, an antioxidant, and titanium glycolate, wherein the composite dibasic acid is composed of terephthalic acid, isophthalic acid, and 2,6-naphthalene dicarboxylic acid;

[0012] Polyester pellets B are spinning-grade PET polyester pellets with an intrinsic viscosity of 0.68-0.69 dL / g and a melting point of 257-259°C.

[0013] In a preferred embodiment of the present invention, the composite dibasic acid is composed of terephthalic acid, isophthalic acid and 2,6-naphthalene dicarboxylic acid in a mass ratio of 370-400:100-125:15-25.

[0014] Further preferably, the mass ratio of the composite dibasic acid to ethylene glycol is 51-53:27.

[0015] In a preferred embodiment of the present invention, the antibacterial agent is a nano-silver antibacterial agent.

[0016] In a preferred embodiment of the present invention, the antioxidant is antioxidant 1222.

[0017] In a preferred embodiment of the present invention, the amount of the antibacterial agent added is 190-350ppm of the complex dibasic acid, the amount of the aldohexose added is 1-10wt% of the complex dibasic acid, the amount of the trimethyl phosphate added is 100-200ppm of the complex dibasic acid, the amount of the antioxidant added is 1500-2800ppm of the complex dibasic acid, and the amount of the diethylene glycol added is 3-8wt% of the complex dibasic acid.

[0018] The method for preparing the above-mentioned antibacterial composite polyester fiber for guide cloth comprises the following steps:

[0019] (1) terephthalic acid, isophthalic acid, 2,6-naphthalene dicarboxylic acid, trimethyl phosphate and ethylene glycol are mixed and stirred uniformly, and then nitrogen is charged to replace air, followed by an esterification reaction. The esterification reaction is carried out at a positive pressure of 0.04-0.06 MPa and a temperature of 210-230° C. The esterification reaction is completed when the amount of esterified water reaches a theoretical calculated value;

[0020] (2) adding diethylene glycol and polyethylene glycol to the material obtained in step (1) while maintaining a positive pressure of 0.05-0.1 MPa, and maintaining the temperature at 220-230° C. for reaction for 25-35 min, then adding an antibacterial agent, aldohexose, an antioxidant and titanium glycol, balancing for 10-15 min, evacuating to 20 Pa within 30-40 min, and slowly raising the temperature to 250-260° C. for reaction for 60-70 min, and extruding and pelletizing to obtain polyester pellets A;

[0021] (3) The polyester pellets A and the polyester pellets B are melt-extruded through their respective screw extruders, enter the corresponding spinning boxes in the core-sheath type composite spinning assembly through their respective melt pipes, and are compositely extruded at the spinneret in a mass ratio of 1:1. After cooling, oiling and winding, the composite polyester fiber for antibacterial guide cloth is obtained.

[0022] In a preferred embodiment of the present invention, in step (3), the temperatures of the spinning boxes corresponding to the polyester pellets A and polyester pellets B are 225-240° C. and 275-280° C. respectively, and the spinning speed is 4700-4800 m / min.

[0023] The use of the composite polyester fiber for antibacterial guide cloth in preparing the antibacterial guide cloth.

[0024] The invention discloses an antibacterial guide cloth, which is prepared by weaving, alkali treating and shaping the fibers including the above-mentioned fibers.

[0025] The beneficial effects of the present invention are:

[0026] 1. The antibacterial composite polyester fiber for the guide cloth prepared by the present invention has a high antibacterial rate, good antibacterial effect, and no secondary pollution risk.

[0027] 2. The composite polyester fiber for the antibacterial guide cloth prepared by the present invention has high breaking strength, high mechanical strength for making the guide cloth, good supporting performance, not easy to deform and slip under the action of external force, and good guide effect.

[0028] 3. The guide cloth prepared by the composite polyester fiber for the antibacterial guide cloth of the present invention has low cost and long service life, which greatly reduces the operating cost of the filter element. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further illustrated and described below through specific implementation methods.

[0030] In the following examples: the polyester pellets B used are spinning-grade PET polyester pellets (purchased from Xiamen Xianglu Chemical Fiber Co., Ltd.), with an intrinsic viscosity of 0.68-0.69 dL / g and a melting point of 257-259°C;

[0031] In addition, polyester pellets A, comparative polyester pellets and polyester pellets B were dried to a moisture content of ≤30 ppm under the following conditions before entering the screw extruder: polyester pellets A and comparative polyester pellets were dried at 100 Pa vacuum and 65°C for 18-25 h, and polyester pellets B were dried at normal pressure and 150°C for 15-20 h.

[0032] Example 1

[0033] (1) Weigh 4000 g of terephthalic acid, 1000 g of isophthalic acid, 150 g of 2,6-naphthalene dicarboxylic acid, 1 g of trimethyl phosphate and 2700 g of ethylene glycol into a reactor, start a stirring device to stir, and after 10 minutes, fill with nitrogen to replace the air in the reactor. Maintain the esterification reaction at a positive pressure of 0.05 MPa and 215° C. The esterification is completed when the amount of esterified water reaches the theoretical calculated value;

[0034] (2) adding 300 g of diethylene glycol and 600 g of polyethylene glycol under a positive pressure of 0.05-0.1 MPa in the reactor, and maintaining the temperature at 225° C. for reaction for 30 min, then adding 6 g of nano silver antibacterial agent (AGT330, particle size ≤100 nm, purchased from Toagosei Co., Ltd., Japan), 100 g of aldohexose, 10 g of antioxidant 1222 and 6 g of titanium glycol, balancing for 12 min, evacuating to 20 Pa within 35 min, and slowly heating to 255° C. for reaction for 60 min, extruding and pelletizing to obtain polyester pellets A, which have an intrinsic viscosity of 0.640 dL / g, a glass transition temperature of 72° C., and a melting point of 180° C.;

[0035] (3) The dried polyester pellets A and polyester pellets B are melt-extruded through their respective screw extruders, enter the sheath-core composite spinning assembly through their respective melt pipes (polyester pellets A and polyester pellets B form the sheath and core of the composite polyester fiber, respectively), and are compositely extruded at the spinneret at a mass ratio of 1:1, cooled, oiled, and wound. The temperatures of the spinning manifolds corresponding to the polyester pellets A and polyester pellets B are 240°C and 280°C, respectively, and the spinning speed is 4800m / min. The specification of the prepared composite polyester fiber is 50dtex / 24f.

[0036] Example 2

[0037] (1) Weigh 4000 g of terephthalic acid, 1000 g of isophthalic acid, 250 g of 2,6-naphthalene dicarboxylic acid, 1 g of trimethyl phosphate, and 2700 g of ethylene glycol and add them into a reactor, start a stirring device to stir, and after 10 minutes, fill with nitrogen to replace the air in the reactor, maintain the esterification reaction at a positive pressure of 0.05 MPa and 223° C., and the esterification is completed when the amount of esterified water reaches the theoretical calculated value;

[0038] (2) adding 300 g of diethylene glycol and 600 g of polyethylene glycol under a positive pressure of 0.05-0.1 MPa in the kettle, and maintaining the temperature at 225° C. for reaction for 30 min, adding 6 g of nano-silver antibacterial agent (same as in Example 1), 250 g of aldohexose, 10 g of antioxidant 1222 and 6 g of titanium glycol, balancing for 12 min, evacuating to 20 Pa within 35 min, and slowly heating to 252° C. for reaction for 60 min, extruding and pelletizing to obtain polyester pellets A, with an intrinsic viscosity of 0.650 dL / g, a glass transition temperature of 75° C., and a melting point of 182° C.;

[0039] (3) As in Example 1, the specification of the prepared composite polyester fiber is 50dtex / 24f.

[0040] Example 3

[0041] (1) 3750 g of terephthalic acid, 1250 g of isophthalic acid, 250 g of 2,6-naphthalene dicarboxylic acid, 1 g of trimethyl phosphate, and 2700 g of ethylene glycol were weighed and added to a reaction kettle, and a stirring device was started to stir. After 10 minutes, nitrogen was filled to replace the air in the reaction kettle, and the esterification reaction was maintained at a positive pressure of 0.05 MPa and 224° C. The esterification was completed when the amount of esterified water reached the theoretical calculated value;

[0042] (2) adding 400 g of diethylene glycol and 500 g of polyethylene glycol under a positive pressure of 0.05-0.1 MPa in the kettle, and maintaining the temperature at 225° C. for reaction for 30 min, adding 5 g of nano-silver antibacterial agent (same as in Example 1), 400 g of aldohexose, 12 g of antioxidant 1222 and 6 g of titanium glycol, balancing for 12 min, evacuating to 20 Pa within 35 min, and slowly heating to 250° C. for reaction for 70 min, extruding and pelletizing to obtain polyester pellets A, with an intrinsic viscosity of 0.647 dL / g, a glass transition temperature of 73° C., and a melting point of 170° C.;

[0043] (3) The dried polyester pellets A and polyester pellets B are melt-extruded through their respective screw extruders, enter the core-skin composite spinning assembly through their respective melt pipes, and are compositely extruded at the spinneret at a mass ratio of 1:1, cooled, oiled, and wound. The temperatures of the spinning manifolds corresponding to the polyester pellets A and polyester pellets B are 230° C. and 280° C., respectively, and the spinning speed is 4750 m / min. The specification of the prepared composite polyester fiber is 50 dtex / 24f.

[0044] Comparative Example 1

[0045] (1) Weigh 4000 g of terephthalic acid, 1000 g of isophthalic acid, 1 g of trimethyl phosphate, and 2700 g of ethylene glycol into a reactor, start a stirring device to stir, and after 10 minutes, fill with nitrogen to replace the air in the reactor. Maintain the esterification reaction at a positive pressure of 0.05 MPa and 223° C. The esterification is completed when the amount of esterified water reaches the theoretical calculated value;

[0046] (2) Add 300 g of diethylene glycol and 600 g of polyethylene glycol under a positive pressure of 0.05-0.1 MPa in the kettle, and keep the temperature at 225° C. for reaction for 30 min, add 6 g of nano-silver antibacterial agent (same as in Example 1), 10 g of antioxidant 1222 and 6 g of titanium glycol, balance for 12 min, evacuate to 20 Pa within 35 min, and slowly raise the temperature to 252° C. for reaction for 60 min, extrusion and pelletization to obtain comparative polyester pellets, which have an intrinsic viscosity of 0.649 dL / g, a glass transition temperature of 67° C., and a melting point of 168° C.;

[0047] (3) The dried comparative polyester pellets and polyester pellets B were melt-extruded through their respective screw extruders, respectively, and entered the sheath-core composite spinning assembly through their respective melt pipes (the comparative polyester pellets and polyester pellets B formed the sheath and core of the composite polyester fiber, respectively), and were compositely extruded at the spinneret at a mass ratio of 1:1, cooled, oiled and wound. The temperatures of the spinning manifolds corresponding to the comparative polyester pellets and polyester pellets B were 228°C and 280°C, respectively, and the spinning speed was 4000m / min. The specification of the prepared composite polyester fiber was 50dtex / 24f.

[0048] The composite polyester fibers prepared in the above embodiments and comparative examples were woven into weft knitted fabrics, treated in 0.1% NaOH solution at 99°C for 30 min, and fixed at 200°C for 3 min to obtain a guide cloth. A conventional guide cloth on the market was used as comparative sample 2. The antibacterial reduction rate under different oscillation contact times was tested with reference to the national standard GB / T 20944.3. The fiber breaking strength test was conducted with reference to GB / T 14344. The test data are shown in Table 1 (Comparative sample 1 is a weft knitted fabric made of the composite polyester fibers prepared in comparative example 1).

[0049] Table 1. Performance test data of examples and comparative samples

[0050]

[0051] It can be seen from the test data in Table 1 that the polyester fiber for guide cloth prepared by the technology of the present invention has excellent antibacterial performance, antibacterial rate and breaking strength, so the guide cloth fabric prepared therefrom has high mechanical strength, good supporting performance, and is not easily deformed under the action of external force.

[0052] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A composite polyester fiber for antibacterial guide cloth, characterized in that: It consists of a skin layer and a core. The skin layer is formed by melt extrusion of polyester pellets A, and the core is formed by melt extrusion of polyester pellets B. Polyester pellets A, with an intrinsic viscosity of 0.64-65dL / g, a glass transition temperature of 72-75°C, and a melting point of 170-182°C, are prepared by reacting a complex dibasic acid, trimethyl phosphate, ethylene glycol, diethylene glycol, polyethylene glycol, an antibacterial agent, aldohexose, an antioxidant, and titanium glycol. The complex dibasic acid is composed of terephthalic acid, isophthalic acid, and 2,6-naphthalene dicarboxylic acid. Polyester pellets B are spinning-grade PET polyester pellets with an intrinsic viscosity of 0.68-0.69dL / g and a melting point of 257-259°C.

2. The antibacterial composite polyester fiber for guide cloth according to claim 1, characterized in that: The composite dibasic acid is composed of terephthalic acid, isophthalic acid and 2,6-naphthalene dicarboxylic acid in a mass ratio of 370-400:100-125:15-25.

3. The antibacterial composite polyester fiber for guide cloth according to claim 2, characterized in that: The mass ratio of the composite dibasic acid to ethylene glycol is 51-53:

27.

4. The antibacterial composite polyester fiber for guide cloth according to claim 1, characterized in that: The antibacterial agent is a nano silver antibacterial agent.

5. The antibacterial composite polyester fiber for guide cloth according to claim 1, characterized in that: The antioxidant is antioxidant 1222.

6. The antibacterial composite polyester fiber for guide cloth according to any one of claims 1 to 5, characterized in that: The amount of the antibacterial agent added is 190-350ppm of the composite dibasic acid, the amount of the aldohexose added is 1-10wt% of the composite dibasic acid, the amount of the trimethyl phosphate added is 100-200ppm of the composite dibasic acid, the amount of the antioxidant added is 1500-2800ppm of the composite dibasic acid, and the amount of the diethylene glycol added is 3-8wt% of the composite dibasic acid.

7. The method for preparing the antibacterial composite polyester fiber for guide cloth according to any one of claims 1 to 6, characterized in that: The steps include: (1) terephthalic acid, isophthalic acid, 2,6-naphthalene dicarboxylic acid, trimethyl phosphate and ethylene glycol are mixed and stirred uniformly, and then nitrogen is charged to replace air, followed by an esterification reaction. The esterification reaction is carried out at a positive pressure of 0.04-0.06 MPa and a temperature of 210-230° C. The esterification reaction is completed when the amount of esterified water reaches a theoretical calculated value; (2) adding diethylene glycol and polyethylene glycol to the material obtained in step (1) while maintaining a positive pressure of 0.05-0.1 MPa, and maintaining the temperature at 220-230° C. for reaction for 25-35 min, then adding an antibacterial agent, aldohexose, an antioxidant and titanium glycol, balancing for 10-15 min, evacuating to 20 Pa within 30-40 min, and slowly raising the temperature to 250-260° C. for reaction for 60-70 min, and extruding and pelletizing to obtain polyester pellets A; (3) The polyester pellets A and the polyester pellets B are melt-extruded through their respective screw extruders, enter the corresponding spinning boxes in the core-sheath type composite spinning assembly through their respective melt pipes, and are compositely extruded at the spinneret in a mass ratio of 1:

1. After cooling, oiling and winding, the composite polyester fiber for antibacterial guide cloth is obtained.

8. The preparation method according to claim 7, characterized in that: In the step (3), the temperatures of the spinning boxes corresponding to the polyester pellets A and polyester pellets B are 225-240° C. and 275-280° C. respectively, and the spinning speed is 4700-4800 m / min.

9. Use of the composite polyester fiber for antibacterial guide cloth according to any one of claims 1 to 6 in the preparation of antibacterial guide cloth.

10. An antibacterial guide cloth, characterized in that: The fiber including the composite polyester fiber for antibacterial guide cloth as claimed in any one of claims 1 to 6 is prepared by weaving, alkali treatment and shaping.

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