Polyamide master batch for papermaking forming net as well as preparation method and application of polyamide master batch

Abstract

The invention discloses a polyamide master batch for a papermaking forming net as well as a preparation method and application of the polyamide master batch, and provides a polyamide master batch product with perfect functions for a spinning net in a blending extrusion granulation mode, so that the subsequent finishing processing procedure is avoided, the production energy consumption is reduced, and the increase of downstream income is facilitated. The master batch manufacturing process is fine, the flow is controllable, the product stability and consistency are high, and control over the downstream product quality is facilitated. The selected auxiliaries have the characteristics of safety and high efficiency, have no side effect, and have no influence on the spinning process of the functional master batch and the subsequent application of the fiber. The method is simple, the modification cost is low, expensive equipment is not needed, and large-scale application and popularization are facilitated.

Description

Technical Field

[0001] This invention belongs to the field of functional textile and chemical fiber technology, specifically relating to a polyamide masterbatch for paper forming wire and its preparation method and application. Background Technology

[0002] The forming wire is a crucial medium for paper web formation and dewatering on a paper machine, playing a key role in paper quality. It is a consumable component used in the paper industry for dewatering. Its main functions are forming and transferring paper, therefore requiring a smooth and fine surface structure to effectively retain fibers and form paper with good uniformity. During operation, the forming wire is constantly subjected to significant tension. To ensure stable production and reduce operating costs, the forming wire must possess good dimensional stability to prevent tensile deformation from affecting dewatering efficiency, and it must also have good abrasion resistance to avoid frequent downtime for replacement.

[0003] In existing technologies, the application of polyamide monofilaments on paper forming wire mesh mainly involves post-processing to apply corresponding functional additives to the polyamide monofilaments and woven wire mesh, or mixing the polyamide carrier and corresponding functional masterbatch during spinning to produce functional polyamide monofilaments. While these techniques can impart the desired functionality to polyamide monofilaments, they have certain disadvantages in terms of quality stability and processing complexity.

[0004] Therefore, it is of great significance to explore a polyamide masterbatch for paper forming wire with good dimensional stability, wear resistance and simple and convenient processing. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to overcome the shortcomings of the prior art and provide a polyamide masterbatch for paper forming wire.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a polyamide masterbatch for paper forming wire, characterized in that: by mass fraction, the formulation of the polyamide masterbatch for paper forming wire includes 75-80 parts of polymeric resin, 0-5 parts of dispersant and 15-25 parts of polymeric functional additives.

[0009] As a preferred embodiment of the polyamide masterbatch for paper forming wire of the present invention, wherein the polymer resin is one of polyamide 6 and polyhexamethylene adipamide.

[0010] As a preferred embodiment of the polyamide masterbatch for paper forming wire of the present invention, the dispersant is one or more of ethylene bis-stearamide and ethylene oxide-vinyl acetate copolymer wax.

[0011] As a preferred embodiment of the polyamide masterbatch for paper forming wire of the present invention, wherein the polymeric functional additive is one or more of antioxidants, anti-hydrolysis agents, and light stabilizers.

[0012] As a preferred embodiment of the polyamide masterbatch for paper forming wire of the present invention, the antioxidant is one or more of tris(2,4-di-tert-butylphenyl) phosphite and N1,N3-bis(2,2,6,6-tetramethylpiperidin-4-yl)isophthalamide.

[0013] As a preferred embodiment of the polyamide masterbatch for paper forming wire of the present invention, the anti-hydrolysis agent is one or more of carbodiimide and N,N'-bis(2,6-diisopropylphenyl)carbodiimide.

[0014] As a preferred embodiment of the polyamide masterbatch for paper forming wire of the present invention, the light stabilizer is one or more of 2-hydroxy-4-methoxybenzophenone and 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol).

[0015] Another object of the present invention is to overcome the shortcomings of the prior art and provide a method for preparing polyamide masterbatch for paper forming wire, characterized in that it includes: Raw material preparation: 75-80 parts of high molecular weight polymer resin, 0-5 parts of dispersant and 15-25 parts of high molecular weight functional additives; Pre-dispersion: After the polymer resin is fully dried, it is mixed and stirred with the dispersant and polymer functional additives; Blending and melting: blending and melting a pre-dispersed mixture, then extruding and granulating it; Post-processing: The extruded melt is rinsed with water, cooled in air, and pelletized to obtain polyamide masterbatch with uniform particles for paper forming wire.

[0016] In a preferred embodiment of the preparation method described in this invention, the extrusion granulation process includes the following temperatures in each zone of the extruder: Zone 1: 200-220°C; Zone 2: 250-265°C; Zone 3: 260-270°C; Zone 4: 260-270°C; Zone 5: 260-270°C; Zone 6: 220-230°C; Zone 7: 210-220°C; Zone 8: 190-210°C; Zone 9: 180-200°C; Zone 10: 200-220°C; Zone 11: 200-220°C; and Die temperature: 255-265°C.

[0017] Another object of the present invention is to overcome the shortcomings of the prior art and provide an application of polyamide masterbatch for paper forming wire, characterized in that: the application includes adding the prepared functional masterbatch to polyamide chips for spinning functional fibers.

[0018] Beneficial effects of this invention: (1) This invention provides a method for preparing polyamide masterbatch for paper forming mesh. For the first time, a polyamide masterbatch product with complete functions for spinning mesh is provided by blending extrusion granulation, avoiding subsequent finishing processes, reducing production energy consumption, and helping to increase downstream revenue.

[0019] (2) The present invention provides a method for preparing polyamide masterbatch for paper forming wire. The masterbatch manufacturing process is refined, the process is controllable, and the product has high stability and consistency, which helps to control the quality of downstream products.

[0020] (3) The polymer functional additives used in this invention are all safe and efficient, have no side effects, and will not affect the spinning process of functional masterbatch or the subsequent application of fibers.

[0021] (4) The method of the present invention is simple, the modification cost is low, and it does not require expensive equipment, making it easy to apply and promote on a large scale. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a diagram of the polyamide masterbatch for paper forming wire prepared in an embodiment of the present invention. Detailed Implementation

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the examples in the specification.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0026] The carrier powder used in this invention is PA6-3 resin powder, grade M2400.

[0027] The instruments and equipment used in the embodiments of this invention are: twin-screw extruder (Rice 40CC), high-speed mixer (MIXACO), and pelletizer (SIG).

[0028] Example 1 This embodiment provides a method for preparing polyamide masterbatch for paper forming wire, including the following steps: (1) Weigh the raw materials according to the following formula: 81.4 parts PA6-3 resin powder (Xinhui Meda), 0.5 parts ethylene bis-stearamide (Honeywell), 9 parts tris(2,4-di-tert-butylphenyl) phosphite (BASF), 9 parts carbodiimide (Shanghai Langyi), and 0.1 parts 2-hydroxy-4-methoxybenzophenone (Klamar). The above raw materials are put into a high-speed mixer and stirred for 10 minutes at a speed of 800 r / min to obtain a pre-dispersed mixture. (2) Add the pre-dispersed mixture to the feed hopper of the extruder, adjust the feeding speed to 30 kg / h, set the screw speed of the extruder to 350 r / min, and set the process temperature to 200℃ for zone 1, 250℃ for zone 2, 260℃ for zone 3, 270℃ for zone 4, 270℃ for zone 5, 220℃ for zone 6, 210℃ for zone 7, 210℃ for zone 8, 200℃ for zone 9, 220℃ for zone 10, 220℃ for zone 11, and 255℃ for die head. After extrusion, the melt is rinsed in a water bath, cooled in air, and then fed into a pelletizer to be cut into cylindrical particles with a length of 3mm ± 0.5mm and a diameter of 2.5mm ± 0.5mm, thus obtaining color masterbatch with uniform particle size. Figure 1 As shown.

[0029] Example 2 This embodiment provides a method for preparing polyamide masterbatch for paper forming wire, including the following steps: (1) Weigh the raw materials according to the following formula: 81.4 parts PA6-3 resin powder, 0.5 parts ethylene bis-stearamide, 9 parts tris(2,4-di-tert-butylphenyl) phosphite, 9 parts N,N'-bis(2,6-diisopropylphenyl)carbodiimide, 0.1 parts 2,2'-methylenebis(4-tert-octyl-6-benzotriazole phenol); The above raw materials are put into a high-speed mixer and stirred for 10 minutes at a speed of 800 r / min to obtain a pre-dispersed mixture. (2) Add the pre-dispersed mixture to the feed hopper of the extruder, adjust the feeding speed to 30 kg / h, set the screw speed of the extruder to 350 r / min, and set the process temperature to 200℃ for zone 1, 250℃ for zone 2, 260℃ for zone 3, 270℃ for zone 4, 270℃ for zone 5, 220℃ for zone 6, 210℃ for zone 7, 210℃ for zone 8, 200℃ for zone 9, 220℃ for zone 10, 220℃ for zone 11, and 255℃ for die head. After extrusion, the melt is rinsed in a water tank, cooled in air, and then cut into cylindrical particles with a length of 3mm±0.5mm and a diameter of 2.5mm±0.5mm by a pelletizer, thus obtaining color masterbatch with uniform particle size.

[0030] Example 3 This embodiment provides a method for preparing polyamide masterbatch for paper forming wire, including the following steps: (1) Weigh the raw materials according to the following formula: 81.4 parts PA6-3 resin powder, 0.5 parts ethylene oxide-vinyl acetate copolymer wax, 9 parts N1,N3-bis(2,2,6,6-tetramethylpiperidin-4-yl)isophthalamide, 9 parts N,N'-bis(2,6-diisopropylphenyl)carbodiimide, 0.1 parts 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol); The above raw materials are put into a high-speed mixer and stirred for 10 minutes at a speed of 800 r / min to obtain a pre-dispersed mixture. (2) Add the pre-dispersed mixture to the feed hopper of the extruder, adjust the feeding speed to 30 kg / h, set the screw speed of the extruder to 350 r / min, and set the process temperature to 200℃ for zone 1, 250℃ for zone 2, 260℃ for zone 3, 270℃ for zone 4, 270℃ for zone 5, 220℃ for zone 6, 210℃ for zone 7, 210℃ for zone 8, 200℃ for zone 9, 220℃ for zone 10, 220℃ for zone 11, and 255℃ for die head. After extrusion, the melt is rinsed in a water tank, cooled in air, and then cut into cylindrical particles with a length of 3mm±0.5mm and a diameter of 2.5mm±0.5mm by a pelletizer, thus obtaining color masterbatch with uniform particle size.

[0031] Example 4 This embodiment provides a method for preparing polyamide masterbatch for paper forming wire, including the following steps: (1) Weigh the raw materials according to the following formula: 81.4 parts PA6-3 resin powder, 0.5 parts ethylene oxide-vinyl acetate copolymer wax, 9 parts N1,N3-bis(2,2,6,6-tetramethylpiperidin-4-yl)isophthalamide, 9 parts carbodiimide, 0.1 parts 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol); The above raw materials are put into a high-speed mixer and stirred for 10 minutes at a speed of 800 r / min to obtain a pre-dispersed mixture. (2) Add the pre-dispersed mixture to the feed hopper of the extruder, adjust the feeding speed to 30 kg / h, set the screw speed of the extruder to 350 r / min, and set the process temperature to 200℃ for zone 1, 250℃ for zone 2, 260℃ for zone 3, 270℃ for zone 4, 270℃ for zone 5, 220℃ for zone 6, 210℃ for zone 7, 210℃ for zone 8, 200℃ for zone 9, 220℃ for zone 10, 220℃ for zone 11, and 255℃ for die head. After extrusion, the melt is rinsed in a water tank, cooled in air, and then cut into cylindrical particles with a length of 3mm±0.5mm and a diameter of 2.5mm±0.5mm by a pelletizer, thus obtaining color masterbatch with uniform particle size.

[0032] Example 5 The difference between this embodiment and Example 1 is that the total amount of polymer functional additives added in step (1) is replaced with 25 parts (including 12 parts of tris(2,4-di-tert-butylphenyl) phosphite, 12.8 parts of carbodiimide, and 0.2 parts of 2-hydroxy-4-methoxybenzophenone), the polymer resin is adjusted to 74.5 parts, and the dispersant ethylene bis-stearamide is 0.5 parts. The remaining steps are the same as in Example 1.

[0033] The obtained polyamide masterbatch particles were uniform and showed no obvious agglomeration. After spinning with PA6 chips at an addition rate of 2%, the tensile strength was tested to be 66.8 N, the elongation at break was 23.5%, the dry heat shrinkage rate was 7.8%, and the dry heat shrinkage stress was 1.4 cN / tex. All properties were similar to those of Example 1 (tensile strength 65.4 N, elongation at break 22.3%, dry heat shrinkage rate 8.2%, dry heat shrinkage stress 1.5 cN / tex), and all were better than the industry standard requirements, demonstrating good performance stability.

[0034] Example 6 The difference between this embodiment and Example 1 is that the total amount of polymer functional additives added in step (1) is replaced with 15 parts (including 7 parts of tris(2,4-di-tert-butylphenyl) phosphite, 7.9 parts of carbodiimide, and 0.1 parts of 2-hydroxy-4-methoxybenzophenone), the polymer resin is adjusted to 84.5 parts, and the dispersant ethylene bis-stearamide is 0.5 parts. The remaining steps are the same as in Example 1.

[0035] The prepared masterbatch exhibited good molding performance and regular particle size. After spinning, the tensile strength was 64.2 N, the elongation at break was 21.8%, the dry heat shrinkage rate was 8.5%, and the dry heat shrinkage stress was 1.5 cN / tex. These performance indicators showed little difference from those in Example 1 and met all the requirements of industry standards, demonstrating that the product performance is stable and reliable within the range of 15-25 parts of functional additives.

[0036] Example 7 The difference between this embodiment and embodiment 1 is that the extruder die temperature in step (2) is replaced with 265°C, while the rest of the steps are the same as in embodiment 1.

[0037] The prepared masterbatch particles were uniform and showed no adhesion. After spinning, the tensile strength was 66.1 N, the elongation at break was 22.8%, the dry heat shrinkage rate was 8.0%, and the dry heat shrinkage stress was 1.4 cN / tex. All properties were basically consistent with those of Example 1 and met the industry standard requirements, indicating that the process stability was good within the preferred die temperature range.

[0038] Example 8 The difference between this embodiment and embodiment 1 is that the extruder die temperature in step (2) is replaced with 255°C, while the rest of the steps are the same as in embodiment 1.

[0039] The prepared masterbatch exhibited excellent molding performance and uniform particle size. After spinning, the tensile strength was 65.7 N, the elongation at break was 22.5%, the dry heat shrinkage rate was 8.1%, and the dry heat shrinkage stress was 1.5 cN / tex. These properties were similar to those in Example 1, further verifying the rationality of the die temperature within the preferred range and the stability of the process.

[0040] Comparative Example 1 The difference between this comparative example and Example 1 is that the total amount of polymeric functional additives added in step (1) is replaced with 30 parts (including 15 parts of tris(2,4-di-tert-butylphenyl) phosphite, 14.9 parts of carbodiimide, and 0.1 parts of 2-hydroxy-4-methoxybenzophenone), the polymeric resin is adjusted to 69.5 parts, and the dispersant ethylene bis-stearamide is 0.5 parts. The remaining steps are the same as in Example 1.

[0041] During the extrusion process, the masterbatch exhibited poor melt flowability and uneven die discharge. After pelleting, some pellets showed burrs and adhesion issues. Spinning tests revealed a breaking strength of 52.3 N, an elongation at break of 17.9%, a dry heat shrinkage rate of 10.8%, and a dry heat shrinkage stress of 1.7 cN / tex. The breaking strength was lower than the industry standard (≥57 N), while the dry heat shrinkage rate and dry heat shrinkage stress exceeded the industry standard range, indicating that the product performance was significantly inferior to that of Example 1.

[0042] Comparative Example 2 The difference between this comparative example and Example 1 is that the total amount of polymeric functional additives added in step (1) is replaced by 10 parts (including 4 parts of tris(2,4-di-tert-butylphenyl) phosphite, 5.9 parts of carbodiimide, and 0.1 parts of 2-hydroxy-4-methoxybenzophenone), the polymeric resin is adjusted to 89.5 parts, and the dispersant ethylene bis-stearamide is 0.5 parts. The remaining steps are the same as in Example 1.

[0043] The masterbatch particles were regular in shape, but the content of functional additives was insufficient. After spinning, the tensile strength was tested to be 50.1 N, the elongation at break was 19.2%, the dry heat shrinkage rate was 10.5%, and the dry heat shrinkage stress was 1.6 cN / tex. The tensile strength did not meet the industry standard requirements, and the dry heat shrinkage rate exceeded the standard range. The performance was far inferior to that of Example 1.

[0044] Comparative Example 3 The difference between this comparative example and Example 1 is that the extruder die temperature in step (2) is replaced with 275°C, while the rest of the steps are the same as in Example 1.

[0045] During extrusion, the melt underwent overheating and degradation, resulting in a yellowish color and the presence of charred particles in the masterbatch. After spinning, the tensile strength was measured at 48.6 N, the elongation at break at 16.3%, the dry heat shrinkage rate at 12.1%, and the dry heat shrinkage stress at 1.9 cN / tex. All performance indicators failed to meet industry standards and were significantly worse than those in Example 1, indicating that exceeding the optimal die temperature range severely impacts product quality.

[0046] Comparative Example 4 The difference between this comparative example and Example 1 is that the extruder die temperature in step (2) is replaced with 245°C, while the rest of the steps are the same as in Example 1.

[0047] Due to insufficient melt fluidity, it was difficult to discharge material from the die head, resulting in uneven particle size of the masterbatch and the presence of numerous fine powders and large agglomerates. After spinning, the tensile strength was tested at 49.3 N, the elongation at break at 17.1%, the dry heat shrinkage rate at 11.8%, and the dry heat shrinkage stress at 1.8 cN / tex. These performance characteristics did not meet industry standards and could not satisfy the requirements for use in paper forming wire, showing a significant gap compared to the excellent performance of Example 1.

[0048] Comparative Example 5 The difference between this comparative example and Example 1 is that the anti-hydrolysis agent carbodiimide in the raw materials is replaced with the conventional hydrolysis stabilizer polycarbodiimide, while the other steps are the same as in Example 1.

[0049] After spinning, the breaking strength was tested to be 58.7 N, the breaking elongation was 20.5%, the dry heat shrinkage rate was 9.3%, and the dry heat shrinkage stress was 1.5 cN / tex. Although all properties met the industry standards, they were all lower than those in Example 1, indicating that the effect of the replaced anti-hydrolysis agent was not as good as that of the carbodiimide selected in this invention.

[0050] Comparative Example 6 The difference between this comparative example and Example 1 is that the antioxidant tris(2,4-di-tert-butylphenyl) phosphite in the raw materials is replaced with conventional antioxidant 1010, while the remaining steps are the same as in Example 1.

[0051] After spinning, the tensile strength was tested to be 59.2 N, the elongation at break was 20.8%, the dry heat shrinkage rate was 9.1%, and the dry heat shrinkage stress was 1.5 cN / tex. The performance met the industry standard, but was lower than that of Example 1, indicating that the antioxidant selected in this invention has a greater advantage in improving fiber performance.

[0052] Comparative Example 7 The difference between this comparative example and Example 1 is that the anti-hydrolysis agent carbodiimide and the antioxidant tris(2,4-di-tert-butylphenyl) phosphite in the raw materials are replaced with polycarbodiimide and antioxidant 1010, respectively. All other steps are the same as in Example 1.

[0053] After spinning, the tensile strength was tested at 47.5 N, the elongation at break was 16.8%, the dry heat shrinkage rate was 11.2%, and the dry heat shrinkage stress was 1.7 cN / tex. The tensile strength did not meet the industry standard, and other performance indicators were significantly worse than those of Example 1. This result fully demonstrates that there is a synergistic effect between the antioxidant and anti-hydrolysis agent selected in this invention, which can significantly improve the overall performance of polyamide fibers, while conventional replacement raw materials cannot achieve this synergistic effect.

[0054] The functional masterbatches obtained in Examples 1-8 and Comparative Examples 1-7 were added at a rate of 2% and spun together with PA6 chips to produce monofilaments with a diameter of 0.35±0.015mm. The relevant performance indicators of the spun fibers were tested in accordance with the industry standard "FZ / T-54015-2009 Monofilaments for Papermaking Mesh". The results are shown in Table 1.

[0055] Table 1

[0056] Comparison with blank samples shows that the masterbatch prepared by this invention can significantly improve the relevant mechanical and physical properties of PA fibers in spinning applications, effectively enhancing the stability and durability of polyamide fibers in paper forming wire applications. Compared with industry standards, the fiber performance prepared from the polyamide masterbatch for paper forming wire provided by this invention far exceeds the industry standard requirements.

[0057] Meanwhile, the results of Examples 5-8 show that the product performance is stable and reliable within the range of raw material ratios and process parameters defined by the present invention; Comparative Examples 1-4 demonstrate that the product performance will drop significantly beyond the range of parameters defined by the present invention, and may even fail to meet industry standards; Comparative Examples 5-7 further verify that the antioxidants and anti-hydrolysis agents selected by the present invention have a synergistic effect, and conventional replacement of raw materials cannot achieve the same effect.

[0058] Furthermore, the technical approach provided by this invention has a simple process in practical applications, requires no multiple post-processing steps, can effectively reduce production costs and energy consumption, and has significant application advantages.

[0059] In summary, this invention, for the first time, provides a polyamide masterbatch product for spinning webs with complete functions through blending extrusion granulation, avoiding subsequent finishing processes, reducing production energy consumption, and contributing to increased downstream profits. The masterbatch manufacturing process of this invention is refined, the process is controllable, and the product has high stability and consistency, which helps control the quality of downstream products. The auxiliaries selected in this invention are all safe and efficient, with no side effects, and will not affect the spinning process of the functional masterbatch or its subsequent fiber applications. The method of this invention is simple, the modification cost is low, and it does not require expensive equipment, facilitating large-scale application and promotion.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the present invention.

Claims

1. A polyamide masterbatch for paper forming wire, characterized in that: The polyamide masterbatch for paper forming wire, by weight, comprises 75-80 parts of polymeric resin, 0-5 parts of dispersant, and 15-25 parts of polymeric functional additives. The polymeric functional additive is one or more of antioxidants, anti-hydrolysis agents, and light stabilizers.

2. The polyamide masterbatch for paper forming wire as described in claim 1, characterized in that: The polymeric resin includes one of polyamide 6 and polyhexamethylene adipamide.

3. The polyamide masterbatch for paper forming wire as described in claim 1, characterized in that: The dispersant includes one or more of ethylene bis-stearamide and ethylene oxide-vinyl acetate copolymer wax.

4. The polyamide masterbatch for paper forming wire as described in claim 1, characterized in that: The antioxidants include one or more of tris(2,4-di-tert-butylphenyl) phosphite and N1,N3-bis(2,2,6,6-tetramethylpiperidin-4-yl)isophthalamide.

5. The polyamide masterbatch for paper forming wire as described in claim 1, characterized in that: The anti-hydrolysis agent is one or more of carbodiimide and N,N'-bis(2,6-diisopropylphenyl)carbodiimide.

6. The polyamide masterbatch for paper forming wire as described in claim 1, characterized in that: The light stabilizer includes one or more of 2-hydroxy-4-methoxybenzophenone and 2,2'-methylenebis(4-tert-octyl-6-benzotriazolephenol).

7. A method for preparing polyamide masterbatch for paper forming wire, characterized in that: include, Raw material preparation: 75-80 parts of high molecular weight polymer resin, 0-5 parts of dispersant and 15-25 parts of high molecular weight functional additives; Pre-dispersion: After the polymer resin is fully dried, it is mixed and stirred with the dispersant and polymer functional additives; Blending and melting: blending and melting a pre-dispersed mixture, then extruding and granulating it; Post-processing: The extruded melt is rinsed with water, cooled in air, and pelletized to obtain polyamide masterbatch with uniform particles for paper forming wire.

8. The preparation method according to claim 7, characterized in that: The extrusion granulation process includes the following temperatures in each zone of the extruder: Zone 1: 200-220℃; Zone 2: 250-265℃; Zone 3: 260-270℃; Zone 4: 260-270℃; Zone 5: 260-270℃; Zone 6: 220-230℃; Zone 7: 210-220℃; Zone 8: 190-210℃; Zone 9: 180-200℃; Zone 10: 200-220℃; Zone 11: 200-220℃; and Die temperature: 255-265℃.

9. The application of the polyamide masterbatch for paper forming wire prepared by the method described in claim 7 or 8, characterized in that: The application includes adding the prepared functional masterbatch to polyamide chips to spin functional fibers.

10. The application as described in claim 9, characterized in that: The prepared functional masterbatch is added to polyamide chips to spin functional fibers, wherein the amount of functional masterbatch added is 1-5%.

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