High color fastness fiber and its preparation method and application

Abstract

The embodiment of the present application discloses a high color fastness fiber and its preparation method and application. The high color fastness fiber includes 70-90 parts of PET and 1-10 parts of modified masterbatch. The modified masterbatch includes a first carrier resin and a modified pigment, and the weight ratio of the first carrier resin to the modified pigment is 50-70:10-30; the modified pigment includes a pigment and a nucleating agent. The pigment is modified by a nucleating agent so that the pigment has the nucleating property of PET, so that the PET in the high color fastness fiber binds the pigment to the crystal region, restricts the movement and migration of the pigment, effectively prevents the pigment from migrating outward, and improves the color fastness of the high color fastness fiber.

Description

Technical Field

[0001] The present application belongs to the field of textile technology, and specifically relates to a high color fastness fiber and a preparation method and application thereof. Background Art

[0002] Polyethylene glycol terephthalate (PET) is obtained by condensation polymerization of dimethyl terephthalate (DMT) or p-phthalic acid (PTA) with ethylene glycol, and is an important textile raw material. PET fiber, also known as polyester, is widely used in textiles, automotive accessories, filling and other fields. The structure of PET fiber is regularly arranged, tightly combined, with high crystallinity and orientation. At the same time, the molecular structure does not contain hydrophilic groups, so it has the advantages of high breaking strength, wear resistance, easy washing and drying, etc.

[0003] Traditional colored fibers are mainly prepared by wet dyeing. The wet dyeing process is to first spin the fibers to obtain fibers, and then dye the fibers to obtain colored fibers. However, due to the lack of color-absorbing groups in PET molecules, colored PET fibers obtained by wet dyeing have disadvantages such as poor dyeability and low color fastness. In addition, the wet dyeing process is the most polluting link in the textile industry chain, which produces a large amount of high-COD wastewater, and often requires a lot of cost for wastewater treatment.

[0004] In order to solve the problems of poor dyeability, low color fastness and serious pollution in the preparation of colored PET fibers by wet dyeing, colored PET fibers can also be prepared by pre-spinning stock solution masterbatch coloring technology. The pre-spinning stock solution masterbatch coloring technology is to mix the pigment, dispersing aid and carrier resin in a mixer, and then melt extrude to obtain the pigment masterbatch, and then mix the pigment masterbatch with PET according to the proportion and melt spin to prepare colored PET fibers. The colored PET fibers prepared by the pre-spinning stock solution masterbatch coloring technology are processed into textile products with the advantages of uniform coloring, high color fastness, simple process and low cost, and at the same time effectively solve the environmental problems of high energy consumption, high water consumption and high COD organic wastewater discharge in the preparation of colored PET fibers by traditional wet dyeing.

[0005] Although the pre-spinning solution masterbatch coloring technology avoids the generation of waste water and has good coloring properties, in the colored PET fiber prepared by the prior art pre-spinning solution masterbatch coloring technology, part of the pigment is present in the non-crystalline region of the polyester matrix. Under certain external forces or under certain environments, such as saliva, surfactants and oil agents, this part of the pigment may migrate outward, thereby causing the colored PET fiber to show the characteristics of easy decolorization by washing and friction, and the washing color fastness and rubbing color fastness of the colored PET fiber are low. In addition, adding pigments to the PET spinning melt will cause the PET colored fiber to feel harder. Therefore, a certain elastomer is often added to the PET spinning melt as a toughening agent to achieve the toughening purpose, so as to improve the problem that the colored PET fiber feels harder. The addition of toughening agents often leads to an increase in the proportion of the non-crystalline region of the polyester matrix, which is more conducive to the escape of the pigments in the non-crystalline region, resulting in a further reduction in the color fastness of the colored PET fiber. Summary of the invention

[0006] The purpose of the present application is to provide a fiber with high color fastness and a preparation method thereof, so as to solve the technical problem of low color fastness of colored PET fiber in the prior art.

[0007] In a first aspect, the present application provides a fiber with high color fastness. The fiber with high color fastness comprises the following components in parts by weight:

[0008] PET 70-90 parts;

[0009] Modified masterbatch 1-10 parts.

[0010] The modified masterbatch comprises a first carrier resin and a modified pigment, and the weight ratio of the first carrier resin to the modified pigment is 50-70:10-30; the modified pigment comprises a pigment and a nucleating agent.

[0011] The high color fastness fiber of the present application example is modified by using a nucleating agent to modify the surface of the pigment, so that the nucleating agent is adsorbed on the surface of the pigment particles to obtain a modified pigment, and then the modified pigment has PET nucleation performance. The modified masterbatch including the modified pigment is further added to the high color fastness fiber, so that the pigment exists inside the crystal region of the polyester matrix, effectively restraining the movement of the pigment, preventing the pigment from migrating outward, making it difficult for the pigment to come out under the conditions of surfactants, friction, etc., thereby improving the color fastness of the high color fastness fiber of the application example.

[0012] In a second aspect, the present application provides a method for preparing a fiber with high color fastness. The method for preparing a fiber with high color fastness comprises the following steps:

[0013] Performing a first mixing treatment on the modified pigment, the first carrier resin and the first dispersant to obtain a modified pigment mixture;

[0014] The modified pigment mixture and the elastomer are subjected to a first mixing process to obtain a modified masterbatch;

[0015] The modified masterbatch and the PET material are subjected to a second mixing process and a spinning process to obtain a fiber with high color fastness.

[0016] Among them, the modified pigment includes a pigment and a nucleating agent; the PET material and the modified masterbatch are subjected to a second mixing treatment according to the weight ratio of 70-90 parts of PET material and 1-10 parts of modified masterbatch; the first carrier resin and the modified pigment are subjected to a first mixing treatment according to a weight ratio of 50-70:10-30.

[0017] The modified pigment having a pigment and a nucleating agent in the preparation method of the high color fastness fiber implemented in the present application has the PET nucleation performance. By mixing the modified masterbatch including the modified pigment with the PET material and then spinning it, when the PET melt is cooled and crystallized during the spinning process, the PET crystallizes with the modified pigment as the crystal nucleus, so that the pigment exists in the interior of the crystal as a component of the crystal nucleus. The crystalline region of the high color fastness fiber prepared by the preparation method of the embodiment of the present application restrains the movement of the pigment, effectively prevents the pigment from migrating outward and escaping, and improves the color fastness of the high color fastness fiber. In addition, the preparation method of the embodiment of the present application adds the pigment to the spinning melt through the dope spinning technology, the utilization rate of the pigment is high, the cost is low, the coloring is uniform, the process is simple, and the generation of waste water in the wet dyeing process is effectively avoided.

[0018] On the third aspect, the embodiments of the present application provide the application of the high color fastness fiber of the embodiments of the present application or the high color fastness fiber prepared by the preparation method of the high color fastness fiber of the embodiments of the present application in needle-punched nonwoven fabrics, clothing and home textiles.

[0019] The high color fastness fiber prepared based on the high color fastness fiber of the embodiment of the present application or the preparation method of the high color fastness fiber of the embodiment of the present application has the characteristic of high color fastness, so that the needle-punched nonwoven fabrics, clothing and home textiles using the high color fastness fiber have the advantages of no fading during washing, use and friction, and good color stability, thereby improving the product quality of the needle-punched nonwoven fabrics, clothing and home textiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the process flow of the method for preparing high color fastness fiber according to an embodiment of the present application.

[0022] Figure 2 This is a schematic diagram of the process flow of the method for preparing high color fastness fiber according to the embodiment of the present application, including the step of preparing modified pigment;

[0023] Figure 3 This is the SEM image of the modified masterbatch provided in Example 1 of the present application.

[0024] Figure 4 This is a differential scanning calorimetry analysis diagram of the high color fastness fiber provided in Examples 1 to 5 of the present application and Comparative Example 1. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0027] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple, respectively.

[0028] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0029] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0030] The weight of the relevant components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the embodiment description of the present application, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass described in the embodiment description of the present application can be a mass unit known in the chemical industry such as μg, mg, g, kg, etc.

[0031] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0032] In a first aspect, the present application provides a fiber with high color fastness. The fiber with high color fastness comprises the following components in parts by weight:

[0033] PET 70-90 parts;

[0034] Modified masterbatch 1-10 parts.

[0035] The modified masterbatch comprises a first carrier resin and a modified pigment, and the weight ratio of the first carrier resin to the modified pigment is 50-70:10-30; the modified pigment comprises a pigment and a nucleating agent.

[0036] The modified pigment contained in the high color fastness fiber of the embodiment of the present application has PET nucleation performance due to the inclusion of a nucleating agent, so that the PET in the high color fastness fiber can be crystallized with the modified pigment as a crystal nucleus, and then the pigment exists in the interior of the crystal as a component of the crystal nucleus. The PET crystal region effectively restrains the movement of the pigment molecules and prevents the escape of the pigment, so that the color fastness of the high color fastness fiber of the embodiment of the present application is improved, and good color stability can be maintained in environments such as saliva, surfactants, oils, acid and alkali solutions, or under the action of external forces. At the same time, the high color fastness fiber of the embodiment of the present application controls the weight fractions of PET and the modified masterbatch, and controls the weight ratio of the first carrier resin and the modified pigment in the modified masterbatch, so that the high color fastness fiber has a good coloring effect while avoiding the high color fastness fiber from feeling too hard.

[0037] It should be noted that the parts in this application specification are all parts by weight.

[0038] In some embodiments, PET can be controlled to be virgin PET, or PET can be controlled to be recycled PET (R-PET), or PET can be controlled to include virgin PET and R-PET. PET has important applications in packaging, textiles, electronic appliances and other fields, so the output of PET is huge. However, PET is difficult to degrade naturally, and the wide application of PET in various fields and the huge output have led to the accumulation of a large amount of waste PET. By controlling the PET in the high color fastness fiber raw material of the embodiment of the present application to be R-PET, the production cost of the color fastness fiber is further reduced, and at the same time, the waste PET can be recycled and reused, and R-PET can be applied to textiles, automotive accessories, filling and other fields, reducing environmental pollution and waste of resources.

[0039] In some embodiments, the intrinsic viscosity of PET can be controlled to be 0.65-0.80 dL / g, and specifically can be 0.65 dL / g, 0.70 dL / g, 0.75 dL / g, 0.80 dL / g, etc. Typical but non-limiting intrinsic viscosities. Controlling the intrinsic viscosity of PET within this range allows the PET melt to have suitable viscosity and rheological properties, improves the mixing uniformity with the modified masterbatch, and further improves the coloring uniformity of the high color fastness fiber.

[0040] In some embodiments, the first carrier resin can be controlled to be PET. Furthermore, the first carrier resin can include at least one of the friction materials prepared from R-PET obtained from waste fibers, R-PET obtained from waste fabrics, and R-PET obtained from waste films. Specifically, these first carrier resins have good compatibility with PET, thereby avoiding the presence of obvious phase separation structure in high color fastness fibers. Moreover, these first carrier resins have a wider molecular weight distribution, and will show faster fluidity under high shear rates of spinning, so that the pigment particles carried by the carrier resin are more evenly dispersed, which is conducive to uniform nucleation and improvement of coloring uniformity.

[0041] In some embodiments, the intrinsic viscosity of the first carrier resin is 0.40-0.50 dL / g, specifically, it can be 0.40 dL / g, 0.42 dL / g, 0.45 dL / g, 0.47 dL / g, 0.5 dL / g, etc. Typical but non-limiting intrinsic viscosities. The intrinsic viscosity of the first carrier resin is controlled so that the first carrier resin has good rheological properties, thereby making the modified pigment uniformly dispersed in the first carrier resin, preventing the modified pigment from being unevenly dispersed in the modified masterbatch, improving the dispersion uniformity of the modified pigment in the modified masterbatch, and further improving the color uniformity of the high color fastness fiber.

[0042] In some embodiments, the modified masterbatch may include a first dispersant, and further, the weight ratio of the first dispersant to the first carrier resin may be controlled to be 0.5-3:50-70. Adding the first dispersant is beneficial to uniform dispersion of the modified pigment in the first carrier resin, and improves the uniformity of pigment dispersion in the modified masterbatch.

[0043] In a further embodiment, the first dispersant can be controlled to include at least one of stearic acid monoglyceride, polyethylene wax, magnesium stearate, copper stearate, barium stearate, and polymetaphosphoric acid. These first dispersants have good lubrication effects, so that the modified pigment is fully dispersed.

[0044] In some embodiments, the modified masterbatch can be controlled to include an elastomer, and further, the weight ratio of the elastomer to the first carrier resin can be controlled to be 5-20:50-70. Modified pigments, especially modified pigments with small particle sizes, can greatly improve the crystallinity of high color fastness fibers, resulting in a decrease in the toughness and impact resistance of high color fastness fibers. The addition of elastomers improves the toughness and impact resistance of high color fastness fibers.

[0045] In some embodiments, the elastomer can be controlled to include a hard segment with a molar ratio of 20-70% and a soft segment with a molar ratio of 30-80%. Further, the hard segment can be controlled to include at least one of polybutylene terephthalate, polyethylene terephthalate, polycaprolactone, and polylactic acid, and the soft segment can be controlled to include at least one of polyethylene glycol, polytetramethylene glycol, polypropylene glycol, and polybutylene glycol. Controlling the hard segment and soft segment of the elastomer further improves the toughness and impact resistance of the high color fastness fiber. It should be noted that the molar ratio of the hard segment or soft segment referred to in the specification of this application is the molar ratio of the monomer in the hard segment or soft segment.

[0046] In some embodiments, the pigment contained in the modified pigment can be controlled to include at least one of phthalocyanine red, phthalocyanine blue, phthalocyanine green, fast red, macromolecular red, macromolecular yellow, permanent yellow, permanent violet, and azo red. These pigments have good compatibility with PET and good thermal stability, and can withstand high temperatures during processing without causing color changes.

[0047] In some embodiments, the particle size D90 of the pigment can be controlled to be less than or equal to 500 nm. Without fine grinding, the coloring amount of organic pigments is higher than that of inorganic pigments, and the deterioration effect on the mechanical properties of the matrix polymer is greater. Controlling the particle size of the pigment within this range greatly increases the specific surface area of ​​the pigment particles, so that the surface of the pigment particles is fully in contact with the nucleating agent, thereby improving the adsorption of the nucleating agent on the pigment surface. When the modified pigment is used as the crystal nucleus of PET crystallization, the pigment particles with high specific surface area are in full contact with the PET molecules, so that the PET molecules quickly crystallize with the modified pigment as the crystal nucleus, thereby improving the PET nucleation performance of the modified pigment.

[0048] In some embodiments, the nucleating agent can be controlled to include at least one of sodium carboxylate, potassium carboxylate, sodium benzoate, dibenzylidene sorbitol, aromatic hydroxysulfonate, and butylpyrazone potassium salt. These nucleating agents can be refined during grinding, or dissolved into liquids when heated, and attached to the surface of the pigment particles, effectively modifying the pigment so that the modified pigment has nucleating properties.

[0049] In some embodiments, the weight ratio of the pigment to the nucleating agent can be controlled to be 90-98:0.5-9, specifically, it can be 90:9, 90:8, 98:5, 95:4, 94:3, 98:0.5, etc., which are typical but non-limiting weight ratios. By controlling the weight ratio of the pigment to the nucleating agent, the nucleating agent is fully attached to the surface of the pigment particles to form a modified pigment with PET nucleating properties, thereby enabling the pigment particles to be bound to the crystalline region of the high-chroma fiber. At the same time, avoid adding too much nucleating agent so that a large amount of free nucleating agent exists in the modified pigment, resulting in a decrease in the toughness and impact resistance of the high-color fastness fiber.

[0050] In some embodiments, the modified pigment may include a second dispersant. When the particle size of the pigment particles is small, the pigment particles need to have a high degree of dispersion in order to allow the nucleating agent to fully adhere to the surface of the pigment particles. By adding the second dispersant, the dispersion of the pigment particles can be increased, so that the nucleating agent can fully adhere to the surface of the pigment particles.

[0051] In some embodiments, the second dispersant may include at least one of stearic acid monoglyceride, polyethylene wax, magnesium stearate, copper stearate, barium stearate, and polymetaphosphoric acid. These second dispersants have good lubrication, so that the pigment particles are fully dispersed and do not adsorb with the nucleating agent or the pigment.

[0052] In some embodiments, the weight ratio of the pigment to the second dispersant can be controlled to be 90-98:0.5-4, specifically, 90:3, 90:4, 98:2.5, 95:0.5, 94:1, etc. The weight ratio is typical but not limiting. By controlling the weight ratio of the pigment to the second dispersant, the pigment particles are fully dispersed evenly.

[0053] In some implementations, the high color fastness fiber of the present application also includes an antioxidant masterbatch, and its content can be 1-5 parts. In further implementations, the antioxidant masterbatch can be controlled to include a second carrier resin, an antioxidant, and a third dispersant. In a further embodiment, the weight ratio of the second carrier resin, the antioxidant, and the third dispersant can be controlled to be 60-80:10-30:0.5-3. The addition of the antioxidant masterbatch improves the aging resistance of the high color fastness fiber. The simultaneous addition of the antioxidant and the nucleating agent has a certain effect on the crystallization behavior of PET. By making the antioxidant into an antioxidant masterbatch and adding it separately from the modified masterbatch, the effect of the antioxidant on the nucleating performance of the modified pigment is reduced.

[0054] In some embodiments, the second carrier resin may be PET. Further, the second carrier resin may be controlled to include at least one of the friction materials prepared from R-PET obtained from waste fibers, R-PET obtained from waste fabrics, and R-PET obtained from waste films. Further, the intrinsic viscosity of the second carrier resin may be controlled to be 0.40-0.50 dL / g, specifically, typical but non-limiting intrinsic viscosities such as 0.40 dL / g, 0.42 dL / g, 0.45 dL / g, 0.47 dL / g, and 0.5 dL / g. These second carrier resins have good compatibility with PET, preventing the spinning melt or high color fastness fiber from producing a phase separation structure. These second carrier resins also have a wider molecular weight distribution and good rheological properties, which are conducive to the smooth progress of the spinning process. The intrinsic viscosity range of the second carrier resin is controlled so that the antioxidant is evenly dispersed in the second carrier resin, thereby improving the uniformity of the antioxidant in the antioxidant masterbatch.

[0055] In some implementations, the antioxidant may be controlled to include at least one of a hindered phenol antioxidant, a thioester antioxidant, and an aromatic amine antioxidant.

[0056] In some implementations, the color fastness to soap washing of the high color fastness fiber implemented in this application is 4-5 levels. Specifically, the color fastness to soap washing of the high color fastness fiber can be tested according to GB / T3921-2008 "Color fastness to soap washing of textiles". Further, the color fastness to rubbing of the high color fastness fiber is 4-5 levels. Specifically, the color fastness to rubbing of the high color fastness fiber can be tested according to GB / T3920-2008 "Color fastness to rubbing of textiles". The improvement of color fastness to soap washing and color fastness to rubbing effectively prevents the high color fastness fiber from fading during washing or use, and broadens the application scope of the high color fastness fiber.

[0057] In some embodiments, the initial crystallization temperature of the high color fastness fiber of the embodiment of the present application can be controlled to be 205-220°C, specifically, it can be non-limiting initial crystallization temperatures such as 205°C, 208°C, 210°C, 215°C, and 220°C.

[0058] In a second aspect, the present application provides a method for preparing a fiber with high color fastness. Figure 1 As shown, the preparation method of the high color fastness fiber comprises the following steps:

[0059] Step S01, performing a first mixing treatment on the modified pigment, the first carrier resin and the first dispersant to obtain a modified pigment mixture;

[0060] Step S02, performing a first mixing process on the modified pigment mixture and the elastomer to obtain a modified masterbatch;

[0061] Step S03, performing a second mixing process and a spinning process on the modified masterbatch and the PET material to obtain a fiber with high color fastness.

[0062] Among them, the modified pigment includes a pigment and a nucleating agent; the PET material and the modified masterbatch are subjected to a second mixing treatment according to the weight proportion of 70-90 parts of the PET material and 1-10 parts of the modified masterbatch; the first carrier resin and the modified pigment are subjected to a first mixing treatment according to a weight ratio of 50-70:10-30.

[0063] The method for preparing high color fastness fiber of the embodiment of the present application modifies the pigment by using a nucleating agent, so that the nucleating agent is adsorbed on the surface of the pigment particles to form a modified pigment, and the modified pigment has PET nucleation performance. In the further spinning process, the PET melt crystallizes with the modified pigment as a crystal nucleus to form a crystal region covering the pigment particles, and then the crystal region restrains the movement of the pigment to prevent the pigment from escaping from the fiber, forming a high color fastness fiber with high color fastness to friction and soaping.

[0064] Step S01:

[0065] In step S01, the modified pigment is subjected to a first mixing treatment with a first carrier resin and a first dispersant, so that the modified pigment is fully dispersed and uniformly mixed with the first carrier resin to form a modified pigment mixture.

[0066] In some embodiments, the weight ratio of the first carrier resin, the modified pigment and the first dispersant can be controlled to be 50-70:10-30:0.5-3. The first dispersant is an additive with a relatively small molecular weight, which can reduce the viscosity of the first carrier resin, thereby making the modified pigment easier to diffuse. However, if too much of the first dispersant is added, the "viscosity reduction" effect of the processing system will be too serious, thereby weakening the force of the equipment on the modified pigment, resulting in a decrease in the dispersion of the pigment particles in the first carrier resin. Controlling the weight ratio of the first carrier resin, the modified pigment and the first dispersant within this range further improves the dispersibility of the modified pigment in the first carrier resin.

[0067] In some embodiments, the first carrier resin can be controlled to include at least one of the friction materials prepared from R-PET obtained from waste fibers, R-PET obtained from waste fabrics, and R-PET obtained from waste films. In a specific example, the first carrier resin can be PET. In a further embodiment, the intrinsic viscosity of the first carrier resin can be controlled to be 0.40-0.50 dl / g, specifically, it can be 0.40 dL / g, 0.42 dL / g, 0.45 dL / g, 0.47 dL / g, 0.5 dL / g, etc. Typical but non-limiting intrinsic viscosities. These first carrier resins and the intrinsic viscosity of the first carrier resin enable the first carrier resin to effectively coat the modified pigment, improve the stability of the modified pigment, and have certain rheological properties, which is conducive to the uniform dispersion of the modified pigment in the first carrier resin.

[0068] In some embodiments, the first dispersant can be controlled to include at least one of stearic acid monoglyceride, polyethylene wax, magnesium stearate, copper stearate, barium stearate, and polymetaphosphoric acid. These first dispersants have good wettability to the modified pigment, can diffuse and penetrate into the interior of the modified pigment to transmit external shear stress, disperse the modified pigment agglomerates, and improve the dispersibility of the modified pigment.

[0069] In some embodiments, the first mixing process can be controlled to be performed in a high-speed mixer. Furthermore, the temperature of the first mixing process can be 70-120° C., the speed can be 500-1500 r / min, and the time can be 2-10 hours. The conditions of the first mixing process are controlled so that the modified pigment is evenly dispersed in the first carrier resin.

[0070] In some embodiments, the modified pigment in step S01 can be carried out as follows: Figure 2 The process flow shown is as follows, for example, the modified pigment can be prepared by a method comprising the following steps:

[0071] Step SA1, performing a third mixing process on the pigment and the second dispersant to obtain a pigment mixture;

[0072] Step SA2: performing a fourth mixing treatment on the pigment mixture and the nucleating agent to obtain a modified pigment.

[0073] Step SA1:

[0074] The pigment and the second dispersant are subjected to a third mixing treatment through step SA1, so that the pigment particles are dispersed to obtain a pigment mixture. In the embodiment, the pigment and the second dispersant can be subjected to the third mixing treatment at a weight ratio of 90-98:0.5-4. By controlling the ratio of the pigment and the second dispersant within this range, the dispersibility of the pigment particles can be further improved, the spinnability of the masterbatch can be improved, the coloring effect of the modified masterbatch can be improved, and the influence of the second dispersant on the mechanical properties of the high color fastness fiber can be reduced.

[0075] In some embodiments, the third mixing process can be performed by a ball mill. The ball mill is used to grind the pigments in the pigment mixture so that the pigments are fully dispersed, and the particle size of the pigment particles can be reduced by grinding. For example, the particle size D90 of the pigment particles in the pigment mixture can be made less than or equal to 500 nm, so as to increase the specific surface area of ​​the pigment particles and improve the PET nucleation performance of the modified pigment.

[0076] In some embodiments, the pigment can be controlled to include at least one of phthalocyanine red, phthalocyanine blue, phthalocyanine green, fast red, macromolecular red, macromolecular yellow, permanent yellow, permanent violet, and azo red. These pigments have good thermal stability and can withstand high temperature processing without significant changes.

[0077] In some embodiments, the second dispersant can be controlled to include at least one of stearic acid monoglyceride, polyethylene wax, magnesium stearate, copper stearate, barium stearate, and polymetaphosphoric acid. These second dispersants have good lubricity, can effectively prevent the agglomeration of pigment particles, and improve the dispersibility of pigment particles.

[0078] Step SA2:

[0079] The pigment mixture and the nucleating agent are subjected to a fourth mixing treatment in step SA2 to prepare a modified pigment.

[0080] In some implementations, the nucleating agent can be dispersed in a dispersion solvent to obtain a nucleating agent dispersion, and then the nucleating agent dispersion and the pigment mixture are subjected to a fourth mixing treatment to improve the dispersibility of the nucleating agent and allow the nucleating agent to fully contact the pigment particles. In further implementations, a drying treatment can be performed after the fourth mixing treatment to evaporate the dispersion solvent to form a modified pigment.

[0081] In the exemplary embodiment, the dispersion solvent of the nucleating agent dispersion may include at least one of ethanol, water, chlorinated alkanes, ethers, esters, and phenols. These dispersion solvents have good wettability to the nucleating agent, the nucleating agent has good dispersibility in these dispersion solvents, and the performance of the nucleating agent and the pigment is not affected after evaporation.

[0082] In some embodiments, the fourth mixing process can be performed by a ball mill, and the pigment particles and the nucleating agent are uniformly mixed and fully contacted by grinding, and the nucleating agent is attached to the surface of the pigment particles to form a modified pigment.

[0083] In some embodiments, the weight ratio of the pigment, the second dispersant and the nucleating agent can be controlled to be 90-98: 0.5-4: 0.5-9. The weight ratio is controlled within this range so that the pigment particles are fully dispersed and the nucleating agent is fully attached to the surface of the pigment particles, and the pigment particles are fully modified so that the formed modified pigment has nucleating properties.

[0084] Step S02:

[0085] Step S02 prepares the modified pigment mixture into a modified masterbatch by subjecting the modified pigment mixture and the elastomer to a first mixing process, thereby improving the dispersibility and stability of the modified pigment, making the modified pigment durable in storage, and improving the dispersibility of the modified pigment in the spinning solution.

[0086] In some embodiments, the weight ratio of the modified pigment and the elastomer in the first mixing process can be controlled to be 10-30:5-20. In a further embodiment, the elastomer can be controlled to include a hard segment with a molar ratio of 20-70% and a soft segment with a molar ratio of 30-80%. In a further embodiment, the hard segment can be controlled to include at least one of polybutylene terephthalate, polyethylene terephthalate, polycaprolactone, and polylactic acid, and the soft segment can also be controlled to include at least one of polyethylene glycol, polytetramethylene glycol, polypropylene glycol, and polybutylene glycol. The nucleation property of the modified pigment will reduce the toughness and impact resistance of the fiber. By adding an elastomer and controlling the amount of elasticity added, the hard segment and the soft segment, the toughness and impact resistance of the high color fastness fiber prepared by the preparation method of the embodiment of the present application are improved.

[0087] In some embodiments, the first mixing process can be controlled to be carried out in a twin-screw extruder, and the modified pigment mixture and the elastomer are extruded through the twin-screw extruder and pelletized to obtain a modified masterbatch. Further, the mixing process temperature can be 240-280° C. The temperature of the first mixing process is controlled so that the first carrier resin is dissolved and the modified pigment is fully dispersed in the first carrier resin.

[0088] Step S03:

[0089] Step S03: After the modified masterbatch and the PET material are subjected to a second mixing process, a spinning process is performed to obtain a fiber with high color fastness.

[0090] In some embodiments, the PET material can be controlled to be virgin PET material, or the PET material can be controlled to be R-PET material. Furthermore, the PET material can be polyester bottle flakes obtained by recycling waste, specifically, it can be PET bottle flakes obtained by recycled PET slices obtained after processing recycled PET bottles.

[0091] It should be noted that the PET material can be particles, powder or friction material, and there is no specific limitation. The raw materials of R-PET are widely available, and the re-melting during recycling causes some fiber molecules to degrade, resulting in a lower molecular weight and wider distribution of R-PET, which makes it difficult to process R-PET into products with higher strength, affecting the high-value utilization of R-PET. Most domestic R-PET products are still in the low-end market, and the profit margin is very limited. The preparation method of the high color fastness fiber in the embodiment of the present application can make R-PET into high color fastness fiber, which increases the application space of R-PET, reduces the production cost of colored fibers, and has good economic benefits.

[0092] In some embodiments, the PET material can also be controlled to include a mixture of PET material and R-PET material. The PET raw material has a higher molecular weight and a high melt viscosity, and the molecular weight of R-PET is relatively lower. The low molecular weight component has a self-plasticizing effect on the material, and the melt viscosity can be reduced during processing. By mixing the PET raw material and R-PET, the molecular weight distribution of the PET material is wide, which is conducive to the smooth progress of the spinning process.

[0093] In some embodiments, the intrinsic viscosity of the PET material can be controlled to be 0.65-0.80 dL / g, specifically, it can be 0.65 dL / g, 0.70 dL / g, 0.75 dL / g, 0.80 dL / g and other typical but non-limiting intrinsic viscosities. Controlling the intrinsic viscosity of the PET material within this range is conducive to the smooth progress of the spinning process. The intrinsic viscosity is closely related to the mechanical properties of the filaments, the uniformity of the filaments, the uniformity of the coloring and the operating stability of the spinning stretching. Controlling the intrinsic viscosity of the PET material within this range makes the PET melt have suitable viscosity and rheological properties during the spinning process, so that the PET melt and the modified masterbatch are mixed uniformly, further improving the coloring uniformity of the high color fastness fiber, preventing the fiber from feeling too hard, and preventing the spinning process from causing problems such as hairy fibers, broken ends, low spinning tension, floating fibers, and slurry dripping.

[0094] In some embodiments, in the second mixing process, the PET material can be controlled to be 70-90 parts, specifically 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, etc., typical but non-limiting weight parts, and the modified masterbatch can be 1-10 parts, specifically 1 part, 3 parts, 5 parts, 7 parts, 9 parts, etc. typical but non-limiting weight parts. The parts of the PET material and the modified masterbatch are controlled, and the amount of the first carrier resin added is controlled to reduce the influence of the first carrier resin on the rheological properties of the spinning melt and the mechanical properties of the high color fastness fiber.

[0095] In some embodiments, before the second mixing treatment, the PET material is also subjected to a pre-crystallization treatment. Furthermore, the temperature of the pre-crystallization treatment can be controlled to be 120-150°C and the time can be 2-4 hours. Further, after the pre-crystallization treatment of the PET material, the PET material can also be subjected to a first vacuum drying treatment. Furthermore, the temperature of the first vacuum drying treatment can be controlled to be 120-160°C, the vacuum degree can be -0.05MPa to -0.1MPa, and the drying time can be 8-12 hours. Through the drying treatment, the water content in the PET material is further reduced, the high-temperature hydrolysis of PET during the spinning process is avoided to cause a decrease in molecular weight, and the quality stability of the high-color fastness fiber product prepared by the spinning process is improved. Through the pre-crystallization treatment, the particles or fragments in the PET material are crystallized to prevent PET from agglomerating in the first vacuum drying process.

[0096] In some embodiments, before the second mixing process, the modified masterbatch can be subjected to a second vacuum drying process. Furthermore, the temperature of the second vacuum drying process can be controlled to be 120-150° C., the vacuum degree can be -0.05 MPa to -0.1 MPa, and the drying time can be 8-12 hours. The second vacuum drying process can be used to reduce the water content in the modified masterbatch and avoid high-temperature hydrolysis of PET during the spinning process.

[0097] It should be noted that the vacuum values ​​in this application specification are all relative to the atmospheric pressure. For example, the vacuum value of -0.05 MPa is the atmospheric pressure minus 0.05 MPa.

[0098] In some embodiments, the spinning screw temperature of the spinning process can be controlled to be 240-280° C., the spinning assembly temperature to be 260-280° C., the spinneret temperature to be 270-280° C., the spinning speed to be 1000-1200 m / min, and the annular blowing temperature to be 10-25° C. The spinning conditions are controlled to improve the uniformity of the melt so that the spinning process proceeds smoothly.

[0099] In some embodiments, after the spinning process, cutting, curling and other processes may be performed according to actual needs to obtain high color fastness fibers that meet target requirements.

[0100] In some embodiments, during the second mixing process, it also includes the step of adding an antioxidant masterbatch to mix with the modified masterbatch and the PET material. Further, the PET material in the second mixing process can be controlled to be 70-90 parts, and the antioxidant masterbatch can be 1-5 parts, specifically 2 parts, 3 parts, 4 parts and other typical but non-limiting parts. Antioxidants have the effect of delaying or inhibiting the oxidation process of polymers. Adding antioxidant masterbatch can effectively delay the aging of high color fastness fibers and extend their service life. Controlling the amount of antioxidant masterbatch added can extend the service life of high color fastness fibers while reducing the impact of antioxidants on the human body when using high color fastness fibers. According to existing research, antioxidants and nucleating agents are added to the spinning solution at the same time, which has an impact on the nucleation performance of the nucleating agent. The preparation method of the embodiment of the present application reduces the impact of antioxidants on the nucleation performance of modified pigments by making antioxidant masterbatch.

[0101] In some embodiments, before the antioxidant masterbatch is mixed with the modified masterbatch and the PET material, the antioxidant masterbatch can be subjected to a third vacuum drying treatment. Furthermore, the temperature of the third vacuum drying treatment can be controlled to be 120-150° C., the vacuum degree to be -0.05 MPa to -0.1 MPa, and the drying time to be 8-12 hours. The third vacuum drying treatment can further reduce the water content in the antioxidant masterbatch to prevent high-temperature hydrolysis of PET during the spinning process.

[0102] In some embodiments, the antioxidant masterbatch is prepared by a method comprising the following steps:

[0103] Step SC1, performing a fifth mixing treatment on the antioxidant, the second carrier resin and the third dispersant to obtain an antioxidant mixture;

[0104] Step SC2: subjecting the antioxidant mixture to a second mixing process to obtain an antioxidant masterbatch.

[0105] Step SC1:

[0106] Step SC1: The antioxidant is mixed with the second carrier resin and the third dispersant to obtain an antioxidant mixture. The third dispersant is added to improve the dispersibility of the antioxidant, and the mixing conditions are controlled to improve the dispersibility of the antioxidant in the second carrier resin.

[0107] In some embodiments, the antioxidant may be controlled to include at least one of a hindered phenol antioxidant, a thioester antioxidant, and an aromatic amine antioxidant.

[0108] In some embodiments, the third dispersant includes at least one of stearic acid monoglyceride, polyethylene wax, magnesium stearate, copper stearate, barium stearate, and polymetaphosphoric acid.

[0109] In some embodiments, the second carrier resin can be controlled to include at least one of the friction materials prepared from R-PET obtained from waste fibers, R-PET obtained from waste fabrics, and R-PET obtained from waste films. These carrier resins have good compatibility with PET. Furthermore, the characteristic viscosity of the second carrier resin can be controlled to be 0.40-0.50dL / g, so that the second carrier resin has a better flow phase and improves the dispersion uniformity of the antioxidant in the second carrier resin.

[0110] In some embodiments, the fifth mixing process can be performed in a high-speed mixer, and further, the temperature of the fifth mixing process can be controlled to be 70-120° C., the speed to be 500-1500 r / min, and the time to be 0-20 min. The conditions of the fifth mixing process are controlled so that the second carrier resin and the antioxidant in the antioxidant mixture are uniformly mixed.

[0111] Step SC2:

[0112] Step SC2: The antioxidant mixture is subjected to a second mixing process to obtain an antioxidant masterbatch.

[0113] In some embodiments, the second mixing process can be carried out in a twin-screw extruder, and the antioxidant mixture is extruded through the twin-screw extruder and pelletized to obtain an antioxidant masterbatch. Further, the temperature of the second mixing process can be controlled to be 240-280° C. The conditions of the second mixing process are controlled so that the second carrier resin dissolves and coats the antioxidant, so that the antioxidant is evenly dispersed in the second carrier resin.

[0114] On the third aspect, the embodiments of the present application provide the application of the high color fastness fiber of the embodiments of the present application or the high color fastness fiber prepared by the preparation method of the high color fastness fiber of the embodiments of the present application in needle-punched nonwoven fabrics, clothing and home textiles.

[0115] The high color fastness fiber of the embodiment of the present application has high color fastness, is resistant to washing and friction, and is applied to needle-punched nonwoven fabrics, clothing and home textiles, so that the needle-punched nonwoven fabrics, clothing and home textiles have the advantages of good color stability and no fading after washing and use, thereby improving the quality of the needle-punched nonwoven fabrics, clothing and home textiles. In particular, the high chromaticity fiber with shorter fibers is prepared using R-PET as a raw material, and is applied to the needle-punched nonwoven fabrics, which improves the quality of the needle-punched nonwoven fabrics while improving the economic benefits.

[0116] The following is a description of the high color fastness fiber and its preparation method and application according to the present application through a number of specific embodiments.

[0117] Example 1

[0118] This embodiment provides a high color fastness fiber, which includes 85 parts of PET, 10 parts of modified masterbatch and 5 parts of antioxidant masterbatch.

[0119] Among them, PET comes from R-PET polyester bottle flakes, and its intrinsic viscosity is 0.70dL / g.

[0120] The modified masterbatch includes a first carrier resin, a modified pigment, an elastomer and a first dispersant in a weight ratio of 50:12:8:1. The first carrier resin is R-PET friction material, and the characteristic viscosity of the first carrier resin is 0.50dL / g; the modified pigment includes a pigment, a nucleating agent and a second dispersant in a weight ratio of 94:1:5, the pigment is phthalocyanine red, the second dispersant is polymetaphosphoric acid, and the nucleating agent is dibenzylidene sorbitol; the elastomer includes a hard segment with a molar ratio of 60% and a soft segment with a molar ratio of 40%, the hard segment is polybutylene terephthalate, and the soft segment is polyethylene glycol; the first dispersant is barium stearate.

[0121] The antioxidant masterbatch comprises a second carrier resin, an antioxidant and a third dispersant in a weight ratio of 75:15:3, wherein the second carrier resin is R-PET friction material, the intrinsic viscosity of the second carrier resin is 0.50 dL / g, the antioxidant is antioxidant 1010, and the third dispersant is barium stearate.

[0122] The preparation method of the high color fastness fiber of this embodiment comprises the following steps:

[0123] Preparation of modified pigments:

[0124] The pigment and the second dispersant were subjected to a third mixing treatment at a weight ratio of 94:1. Specifically, they were placed in a ball mill and ground for 30 minutes at a ball milling ratio of 15:1 and a rotation speed of 300 r / min to obtain a pigment mixture. The pigment mixture and the nucleating agent dispersion were subjected to a fourth mixing treatment at a weight ratio of 94:5 for the pigment and the nucleating agent. Specifically, they were placed in a ball mill and ground for 60 minutes at a ball milling ratio of 15:1 and a rotation speed of 400 r / min, and then dried to obtain a modified pigment. The dispersion medium of the nucleating agent dispersion is anhydrous ethanol.

[0125] Modified masterbatch preparation:

[0126] The first carrier resin, the modified pigment, the elastomer and the first dispersant are added to a high-speed mixer in a weight ratio of 50:12:8:1 for a first mixing treatment to obtain a modified pigment mixture, and then the modified pigment mixture is subjected to a first kneading treatment to obtain a modified masterbatch. In the first mixing treatment, the barrel temperature of the high-speed mixer is 100°C, the speed is 1000r / min, and the mixing time is 2h; the first kneading treatment is to add the modified pigment mixture to a twin-screw extruder at 270°C for extrusion, and pelletize the extrudate to obtain the modified masterbatch.

[0127] Preparation of antioxidant masterbatch:

[0128] The second carrier resin, the antioxidant, and the third dispersant are added to a high-speed mixer in a weight ratio of 75:15:3 for a fifth mixing process to obtain an antioxidant mixture, and then the antioxidant mixture is subjected to a second mixing process to obtain an antioxidant masterbatch. In the fifth mixing process, the barrel temperature of the high-speed mixer is 120°C, the speed is 1000r / min, and the mixing time is 20min; the second mixing process is to add the antioxidant mixture to a twin-screw extruder at 270°C for extrusion, obtain the extrudate and pelletize it to obtain the antioxidant masterbatch.

[0129] Raw material pretreatment:

[0130] The PET material was pre-crystallized at a temperature of 120°C for 4 hours. The pre-crystallized PET material was then vacuum dried at a temperature of 150°C and a vacuum degree of -0.1 MPa for 12 hours. The PET material was R-PET polyester bottle flakes with an intrinsic viscosity of 0.70 dL / g.

[0131] The modified masterbatch and antioxidant masterbatch were vacuum dried at a temperature of 130° C. and a vacuum degree of -0.1 MPa for 10 h respectively.

[0132] Preparation of high color fastness fibers:

[0133] 85 parts of dried PET material, 10 parts of modified masterbatch and 5 parts of antioxidant masterbatch were mixed evenly, added into the silo for spinning treatment, and then high color fastness fiber was obtained according to the conventional short fiber forming process. Among them, the spinning treatment conditions are as follows: the spinning screw temperature is set at 270℃, the spinning assembly temperature is 275℃, the spinneret temperature is 270℃, the spinning speed is 1000m / min, and the annular blowing temperature is 20℃. The initial crystallization temperature of the high color fastness fiber is 209℃.

[0134] Example 2 to Example 5

[0135] Embodiment 2 to embodiment 5 respectively provide a high color fastness fiber, and the high color fastness fiber of embodiment 2 to embodiment 5 is basically the same as the high color fastness fiber of embodiment 1, and the difference is that the weight ratio of the second dispersant of the pigment and the nucleating agent in the modified pigment of the high color fastness fiber of embodiment 2 to embodiment 5 is different, and the weight ratio of the first carrier resin, modified pigment, elastomer and first dispersant in the modified masterbatch is different, as shown in Table 1.

[0136] The preparation process of the high color fastness fiber of Examples 2 to 5 is basically the same as the preparation process of the high color fastness fiber of Example 1, and the main differences include: the grinding time of the pigment and the second dispersant during the third mixing treatment in the preparation process of the modified pigment is different, the grinding time of the pigment and the nucleating agent during the fourth mixing treatment is different, and the mixing time of the first carrier resin, the modified pigment, the elastomer and the first dispersant in the second mixing treatment is different, as shown in Table 1.

[0137] Table 1

[0138]

[0139] Embodiment 6-10

[0140] Examples 6-10 provide a high color fastness fiber respectively. The high color fastness fibers and the preparation processes of Examples 6-10 are basically the same as the high color fastness fibers and the preparation process of Example 2, except that:

[0141] In Example 6, there are 90 parts of PET material, 1 part of modified masterbatch, and 5 parts of antioxidant masterbatch.

[0142] In Example 7, there are 70 parts of PET material, 5 parts of modified masterbatch, and 3 parts of antioxidant masterbatch.

[0143] In Example 8, there are 80 parts of PET material, 10 parts of modified masterbatch, and 1 part of antioxidant masterbatch.

[0144] The weight ratio of the first carrier resin, the modified pigment, the elastomer and the first dispersant in the modified masterbatch of Example 9 is 70:10:17:3.

[0145] The weight ratio of the first carrier resin, the modified pigment, the elastomer and the first dispersant in the modified masterbatch of Example 10 is 62:22:15:1.

[0146] Comparative Example 1

[0147] Comparative Example 1 provides a high color fastness fiber. The high color fastness fiber and the preparation process thereof in Comparative Example 1 are the same as the high color fastness fiber and the preparation process thereof in Example 1, except that:

[0148] In comparative example 1, no nucleating agent was added during the preparation of the modified masterbatch.

[0149] Performance Test:

[0150] Take the modified masterbatch of Example 1 and observe the surface of the modified masterbatch using a scanning electron microscope. The results are as follows: Figure 3 As shown, Figure 3 This is a SEM image of the modified masterbatch provided in Example 1 of the present application. Figure 3 As shown, in the modified masterbatch, the modified pigment particles are coated in the first carrier resin. Since the first carrier resin and the polymer matrix of the high color fastness fiber are both PET, there is no obvious phase separation structure in the spinning melt or the high color fastness fiber.

[0151] The high color fastness fibers of Examples 1 to 5 and Comparative Example 1 were subjected to differential scanning calorimetry analysis. The results are as follows: Figure 4 As shown in Table 2, Figure 4 This is a differential scanning calorimetry analysis diagram of the high color fastness fiber provided in Examples 1 to 5 of the present application and Comparative Example 1.

[0152] The high color fastness fibers of Examples 1 to 5 and Comparative Example 1 were tested for color fastness according to the standards of GB / T3920-2008 "Textile Color Fastness Tests - Color Fastness to Rubbing" and GB / T3921-2008 "Textile Color Fastness Tests - Color Fastness to Soaping", and the results are shown in Table 2.

[0153] Table 2

[0154]

[0155] like Figure 4 As shown in Table 2, the initial crystallization temperature of the high color fastness fiber in Comparative Example 1 is the lowest. In the order of Comparative Example 1, Example 5, Example 1 and Example 4, and Example 3 to Example 2, as the nucleating agent is added and the content of the nucleating agent increases, the initial crystallization temperature of the high color fastness fiber gradually increases, and the initial crystallization temperatures of Examples 1 to 5 are significantly different from the initial crystallization temperature of Comparative Example 1, indicating that in the preparation method of the embodiment of the present application, the crystallinity of the spinning melt is increased by adsorbing the nucleating agent on the surface of the pigment particles, and the pigment particles are effectively bound to the crystallization area. With the addition of the nucleating agent and the increase in the amount of the nucleating agent added, the color fastness to friction and soaping of the high color fastness fiber gradually increases, proving that in the high color fastness fiber of the embodiment of the present application, the pigment is effectively bound to the crystal area to improve the color fastness of the PET fiber.

[0156] The high color fastness fibers of Examples 6 to 10 were tested for color fastness according to the standards of GB / T3920-2008 "Textile Color Fastness Test - Color Fastness to Rubbing" and GB / T3921-2008 "Textile Color Fastness Test - Color Fastness to Washing with Soap". The color fastness to rubbing and the color fastness to washing with soap of the high color fastness fibers of Examples 6 to 10 were similar to those of the high color fastness fibers of Example 2.

[0157] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A fiber with high color fastness, characterized in that: The high color fastness fiber comprises the following components in parts by weight: PET 70-90 parts; Modified masterbatch 1-10 parts; Wherein, the modified masterbatch comprises a first carrier resin and a modified pigment, and the weight ratio of the first carrier resin to the modified pigment is 50-70:10-30; The first carrier resin is PET; The modified masterbatch further comprises an elastomer, wherein the weight ratio of the elastomer to the first carrier resin is 5-20:50-70, the elastomer comprises a hard segment with a molar proportion of 20-70% and a soft segment with a molar proportion of 30-80%, the hard segment comprises at least one of polybutylene terephthalate and polyethylene terephthalate, and the soft segment comprises at least one of polyethylene glycol, polytetramethylene glycol, polypropylene glycol, and polybutylene glycol; The modified pigment comprises a pigment and a nucleating agent, and the weight ratio of the pigment to the nucleating agent is 90-98:0.5-9; The particle size D90 of the pigment is less than or equal to 500 nm, and the pigment includes at least one of phthalocyanine red, phthalocyanine blue, phthalocyanine green, light-fast red, macromolecular red, macromolecular yellow, permanent yellow, permanent violet, and azo red; The nucleating agent includes at least one of sodium carboxylate, potassium carboxylate, sodium benzoate, dibenzylidene sorbitol, aromatic hydroxy sulfonate, and butyl pyraclostrobin potassium salt.

2. The high color fastness fiber according to claim 1, characterized in that: The intrinsic viscosity of the PET is 0.65-0.80 dL / g; and / or The modified masterbatch further comprises a first dispersant, and the weight ratio of the first dispersant to the first carrier resin is 0.5-3:50-70; and / or The modified pigment further comprises a second dispersant, and the weight ratio of the pigment to the second dispersant is 90-98:0.5-4.

3. The high color fastness fiber according to claim 2, characterized in that: The first dispersant comprises at least one of stearic acid monoglyceride, polyethylene wax, magnesium stearate, copper stearate, barium stearate, and polymetaphosphoric acid; and / or The second dispersant includes at least one of stearic acid monoglyceride, polyethylene wax, magnesium stearate, copper stearate, barium stearate, and polymetaphosphoric acid.

4. The high color fastness fiber according to any one of claims 1 to 3, characterized in that: The first carrier resin has an intrinsic viscosity of 0.40-0.50 dL / g; and / or The high color fastness fiber further comprises 1-5 parts of antioxidant masterbatch, wherein the antioxidant masterbatch comprises a second carrier resin, an antioxidant, and a third dispersant, and the weight ratio of the second carrier resin, the antioxidant, and the third dispersant is 60-80:10-30:0.5-3; and / or The color fastness to soaping of the high color fastness fiber is grade 4-5; and / or The high color fastness fiber has a color fastness to rubbing of level 4-5; and / or The initial crystallization temperature of the high color fastness fiber is 205-220°C.

5. The high color fastness fiber according to claim 4, characterized in that: The second carrier resin is PET; and / or The intrinsic viscosity of the second carrier is 0.40-0.50 dL / g; and / or The antioxidant comprises at least one of a hindered phenol antioxidant, a thioester antioxidant and an aromatic amine antioxidant; and / or The third dispersant includes at least one of stearic acid monoglyceride, polyethylene wax, magnesium stearate, copper stearate, barium stearate, and polymetaphosphoric acid.

6. A method for preparing a fiber with high color fastness as claimed in any one of claims 1 to 5, characterized in that: The steps include: Performing a first mixing treatment on the modified pigment, the first carrier resin and the first dispersant to obtain a modified pigment mixture; The modified pigment mixture and the elastomer are subjected to a first mixing process to obtain a modified masterbatch; The modified masterbatch and the PET material are subjected to a second mixing process and a spinning process to obtain the high color fastness fiber; Wherein, the modified pigment includes a pigment and a nucleating agent; the PET material and the modified masterbatch are subjected to a second mixing treatment according to the weight proportion of 70-90 parts of PET material and 1-10 parts of modified masterbatch; the first carrier resin and the modified pigment are subjected to a first mixing treatment according to a weight ratio of 50-70:10-30.

7. The preparation method according to claim 6, characterized in that: The modified pigment is prepared by a method comprising the following steps: Performing a third mixing process on the pigment and the second dispersant to obtain a pigment mixture; Performing a fourth mixing process on the pigment mixture and the nucleating agent to obtain the modified pigment; Wherein, the weight ratio of the pigment, the second dispersant and the nucleating agent is 90-98:0.5-4:0.5-9; and / or In the second mixing process, the step of adding an antioxidant masterbatch to mix with the modified masterbatch and the PET material is also included, and the weight ratio of the antioxidant masterbatch to the PET material is 1-5:70-90; and / or The conditions of the first mixing process include at least one of the following: The temperature is 70-120℃, the speed is 500-1500r / min, and the time is 2-10h; and / or The temperature of the first mixing treatment is 240-280°C; and / or The spinning process conditions include at least one of the following: The spinning screw temperature is 240-280°C, the spinning assembly temperature is 260-280°C, the spinneret temperature is 270-280°C, the spinning speed is 1000-1200m / min, and the annular air temperature is 10-25°C; and / or Before the second mixing process, the preparation method further comprises: The PET material is subjected to a pre-crystallization treatment, wherein the pre-crystallization treatment is performed at a temperature of 120-150° C. and for a time of 2-4 hours.

8. The preparation method according to claim 7, characterized in that: The antioxidant masterbatch is prepared by a method comprising the following steps: The antioxidant is mixed with the second carrier resin and the third dispersant in a fifth mixing process to obtain an antioxidant mixture, wherein the fifth mixing process is performed at a temperature of 70-120° C., a rotation speed of 500-1500 r / min, and a time of 0-20 min; The antioxidant mixture is subjected to a second mixing process to obtain the antioxidant masterbatch, wherein the temperature of the second mixing process is 240-280°C.

9. Use of the high color fastness fiber according to any one of claims 1 to 5 or the high color fastness fiber prepared by the preparation method according to any one of claims 6 to 8 in needle-punched nonwoven fabrics, clothing, and home textiles.

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