Nylon soft pen point, preparation method thereof and alcohol mark pen

Abstract

The invention discloses a nylon soft pen point and a preparation method thereof and an alcohol mark pen, the nylon soft pen point is composed of a fiber bundle formed by a nylon pen point synthetic material and an adhesive, the nylon pen point synthetic material comprises the following components in parts by weight: 50-80 parts of copolymerized modified nylon, 1-5 parts of a coupling agent and 1-5 parts of a coupling agent. The composite material is prepared from the following components in parts by weight: 5-15 parts of nano silicon dioxide, 5-10 parts of maleic anhydride grafted polypropylene, 0.5-1.5 parts of an antioxidant and 0.5-1.5 parts of an ultraviolet light absorber. The formula of the nylon pen point synthetic material and the formula of the adhesive are optimized and modified, all components in the modified nylon pen point synthetic material have a synergistic effect, and the chemical stability and compactness of the material are improved; the modified nylon pen point adhesive has good adhesive performance and chemical corrosion resistance, and can effectively isolate alcohol ink from a nylon pen point and prevent ink from changing color. And the problem of ink color change caused by contact between the nylon pen point and alcohol ink is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of pen making, in particular to a nylon soft pen tip and a preparation method thereof, and an alcohol marker pen. Background Art

[0002] With the development of the writing and painting industries, alcohol ink has become widely used in writing and painting tools such as alcohol markers due to its advantages such as fast drying and low smudging. Nylon nibs are a common material for writing and painting tools due to their excellent wear resistance and elasticity. However, in actual use, the ink is prone to discoloration, seriously affecting the writing and painting effect. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a nylon soft brush tip and a preparation method thereof, which effectively solves the problem of ink discoloration caused by contact between the nylon soft brush tip and alcohol ink by modifying the synthetic material of the nylon brush tip and the adhesive used.

[0004] In the first aspect, an embodiment of the present invention provides a nylon soft pen tip, which is composed of a fiber bundle formed by a nylon pen tip synthetic material and an adhesive, wherein the nylon pen tip synthetic material includes, by weight: 50-80 parts of copolymer-modified nylon, 5-15 parts of nano-silica, 5-10 parts of maleic anhydride grafted polypropylene, 0.5-1.5 parts of an antioxidant, and 0.5-1.5 parts of an ultraviolet absorber.

[0005] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved and realized.

[0006] As a preferred technical solution, the nylon soft brush tip, wherein the adhesive, by weight, includes: 50-70 parts of epoxy resin, 20-35 parts of polyurethane prepolymer, 5-10 parts of reactive diluent, 10-20 parts of curing agent, 3-8 parts of nano-silica, 1-3 parts of ultraviolet absorber, 1-3 parts of silane coupling agent and 0.5-1.5 parts of defoaming agent.

[0007] As a preferred technical solution, the nylon soft brush tip, wherein the copolymer modified nylon, in parts by weight, includes: 50-70 parts of caprolactam, 30-50 parts of modified PA66 monomer, 0.01-0.1 parts of phosphorylating agent and 0.1-1 parts of acetic acid molecular weight regulator.

[0008] As a preferred technical solution, the nylon soft brush tip, wherein the preparation method of the nylon brush tip synthetic fiber comprises:

[0009] The copolymer modified nylon after dehydration is mixed with nano silicon dioxide, maleic anhydride grafted polypropylene, an antioxidant and an ultraviolet absorber to obtain a mixed material;

[0010] The mixed material is added to a twin-screw extruder and melt-extruded to obtain a modified synthetic material; the temperature of the screw extruder is set to: zone 1 temperature 210-220°C, zone 2 temperature 220-240°C, zone 3 temperature 240-260°C, zone 4 temperature 250-270°C, and die head temperature 260-270°C;

[0011] The modified synthetic material is subjected to a wire drawing process to obtain the nylon pen tip synthetic fiber.

[0012] As a preferred technical solution, the nylon soft brush tip, wherein the particle size of the nano-silicon dioxide is less than 100 nm.

[0013] As a preferred technical solution, the nylon soft brush tip, wherein the copolymer modified nylon is obtained by using copolymer nylon, introducing a benzene ring structure monomer or a tetrafluoroethylene monomer and copolymerizing the copolymer nylon; or the copolymer nylon is treated with oxygen plasma and then grafted with methyl methacrylate.

[0014] As a preferred technical solution, the nylon soft brush tip, wherein the copolymer modified nylon is obtained by introducing melamine resin or amino resin into the copolymer nylon and performing a cross-linking reaction with the hydroxyl groups in the copolymer nylon.

[0015] As a preferred technical solution, in the nylon soft brush tip, the polyurethane prepolymer is a fluorine-containing polyurethane prepolymer; and the reactive diluent is an epoxy reactive diluent.

[0016] As a preferred technical solution, the nylon soft brush tip, wherein the curing agent is one or a combination of acid anhydrides and phenolic resins.

[0017] In a second aspect, a method for preparing the nylon soft brush tip according to the first aspect, comprising:

[0018] The nylon pen tip synthetic fibers are bundled according to the number of strands, and the stranded fibers are drawn into a yarn shaker by a hub to obtain a fiber bundle;

[0019] shaping the fiber bundle, and then introducing the fiber bundle into a dipping tank for dipping;

[0020] After the glue is added, foaming is carried out under the added conditions to obtain the rod material;

[0021] According to the size of the prepared pen tip, the rod material is cut into short rods, and the nylon soft pen tip is obtained after grinding, cleaning and drying.

[0022] In a third aspect, an alcohol marker pen comprises a pen body, a core filled with alcohol ink, and the above-mentioned nylon soft pen tip, wherein the nylon soft pen tip is installed at at least one end of the pen body, and the core is installed in the pen body and connected to the nylon soft pen tip.

[0023] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0024] By optimizing and modifying the formula of a synthetic nylon pen tip material, this invention effectively solves the problem of discoloration caused by contact between soft nylon pen tips and alcohol ink. The components of the modified nylon pen tip synthetic material work synergistically, improving the material's chemical stability and density. This prevents discoloration of the writing ink, improves the performance and quality of writing instruments, and has broad market application prospects. DETAILED DESCRIPTION

[0025] To help those skilled in the art better understand the solutions of the present invention, the following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work shall fall within the scope of protection of the present invention.

[0026] The inventors discovered that the synthetic material of alcohol marker nylon tips and the adhesive used to connect the tips internally can interact with alcohol ink, causing discoloration. To address this, the inventors have developed a nylon soft pen tip that prevents discoloration. The tip is composed of a fiber bundle of nylon pen tip synthetic fibers and an adhesive. The nylon pen tip synthetic fibers comprise, by weight, 50-80 parts copolymer-modified nylon, 5-15 parts nano-silica, 5-10 parts maleic anhydride-grafted polypropylene, 0.5-1.5 parts antioxidant, and 0.5-1.5 parts UV absorber.

[0027] In one embodiment of the present invention, copolymer modified nylon can be copolymerized and modified by using copolymer nylon (PA6 / PA66) and introducing benzene ring structure monomer (such as dimethyl terephthalate) or tetrafluoroethylene. The introduction of benzene ring structure reduces the gap between molecular chains, hinders the penetration of solvent molecules and reduces the swelling rate; tetrafluoroethylene monomer copolymer modified nylon can form a low surface energy inert layer and improve the strong acid and alkali resistance. The purchase source of the copolymer nylon is not particularly limited. For example, DuPont Elvamide A combination of one or more of 8061, Ube 5034TX26, BASF Ultramid C35, and Radici N609.

[0028] In one implementation of the present invention, a cross-linking resin can be introduced into the copolymer nylon through melamine resin or amino resin, and covalent bonds are formed by cross-linking reaction with amino groups or hydroxyl groups, which restricts the movement of molecular chains, reduces the invasion path of solvents or other chemicals, and improves stability.

[0029] In one implementation of the present invention, the copolymerized nylon may be treated with oxygen plasma to introduce active groups such as hydroxyl and carboxyl groups, and then grafted with MMA to form a solvent-resistant chemical structure to enhance the stability of the nylon.

[0030] In one implementation of the present invention, the copolymer-modified nylon comprises, by weight, 55-60 parts of caprolactam, 35-40 parts of modified PA66 monomer, 0.05-0.1 parts of phosphorylating agent, and 0.3-0.6 parts of acetic acid molecular weight regulator; wherein the modified PA66 monomer may be a styrene / tetrafluoroethylene monomer modified PA66 monomer.

[0031] In one embodiment of the present invention, the addition of a certain proportion of nano-silica can enhance the overall performance of the modified synthetic material by strengthening mechanical properties, improving heat and wear resistance, and optimizing functional stability. The nano-silica can be selected from one or a combination of Evonik A200, R972, and R974. The maleic anhydride-grafted polypropylene can be selected from one or a combination of Mitsui ADMER resin QB510, Huaxiang ZJ-900P, and Mitsui Chemicals AT2937. The antioxidant can be selected from one or a combination of BASF 1010, BASF 1098, and BASF 168. The UV absorber can be selected from C81 or Tinuvin 328.

[0032] In the present invention, the nano-silica particle size is less than 100nm. When the nano-silica particle size is less than 100nm, the nano-silica has a large specific surface area, forming a strong interface bond with the PA matrix, acting as a "rigid skeleton" to hinder the movement of molecular chains, significantly improving the material rigidity. At the same time, when the PA is subjected to external forces, microcracks are generated around the nano-SiO2 and absorb energy, inhibiting the expansion of the main cracks and significantly improving the PA's elongation at break.

[0033] In one implementation of the present invention, the method for preparing the modified nylon pen tip synthetic material comprises at least the following steps:

[0034] Weigh the modified nylon resin and dry it at 70-100°C for 3-6 hours to remove moisture and prevent hydrolysis during processing. Add the dried modified nylon resin, nanosilica, maleic anhydride-grafted polypropylene, antioxidant, and UV absorber to a high-speed mixer and mix at 100-350 rpm for 30-60 minutes to ensure thorough and even dispersion of the components. Add the mixed materials to a twin-screw extruder for melt blending. The extruder temperatures are set to: 210-220°C for zone 1, 220-240°C for zone 2, 240-260°C for zone 3, 250-270°C for zone 4, and 260-270°C for the die head. The screw speed is 150-400r / min. Through high-temperature melting and the shearing action of the screw, the components are fully integrated at the molecular level. Finally, the molten blended material is extruded through the die hole of the extruder head, and after being water-cooled and drawn into strands, it is cut into uniform particles by a pelletizer.

[0035] Preparation of nylon fiber filaments: The modified nylon pen tip synthetic material particles are heated to a molten state in a screw extruder (heating temperature 250℃-270℃) to form a uniform melt. The melt is quantitatively delivered to a spinneret with a micropore diameter of 0.3-1.0mm via a metering pump. It is extruded into a thin stream through the spinneret micropores and then cooled by air or water bath to control the cooling and solidification rate. Air cooling requires adjusting the wind speed (0.5-2m / s) and temperature (20-50℃) to avoid melt fracture or surface roughness. The blank is stretched by pulling rollers to improve orientation and strength. The pulling speed is matched with the extrusion speed (speed ratio 1.2-2.0) to produce nylon fiber filaments.

[0036] In one embodiment of the present invention, the adhesive comprises, by weight, 55-60 parts epoxy resin, 25-30 parts polyurethane prepolymer, 7-8 parts reactive diluent, 10-15 parts curing agent, 5-7 parts nano-silica, 1-2 parts UV absorber, 1-2 parts silane coupling agent, and 0.5-0.8 parts defoaming agent. The epoxy resin, with its excellent bonding properties, is the primary component of the adhesive; the polyurethane prepolymer improves the adhesive's flexibility and chemical resistance; the reactive diluent reduces the adhesive's viscosity and toughness, facilitating construction; the curing agent causes the epoxy resin and polyurethane prepolymer to undergo a cross-linking reaction, forming a strong adhesive layer; the nano-titanium dioxide exhibits excellent chemical inertness and shielding properties, preventing contact between the alcohol ink and the adhesive; and the UV absorber further improves the adhesive's aging resistance, preventing adverse reactions between the adhesive and the alcohol ink due to environmental factors. The polyurethane prepolymer is a self-made fluorinated polyurethane prepolymer, and the reactive diluent is an epoxy reactive diluent selected from one or more of Dow 702, Sanmu 632, and 6690. The curing agent is selected from one or a combination of anhydride, phenolic resin, etc.

[0037] In one embodiment of the present invention, the epoxy resin is a bisphenol F epoxy resin. The bisphenol F epoxy resin is not particularly limited. For example, a combination of one or more of Dow 356, Dow 354, Star 830, and Nan Ya 171 brands can be purchased.

[0038] In one implementation of the present invention, the method for preparing the adhesive comprises at least the following steps:

[0039] First, add epoxy resin, reactive diluent, polyurethane prepolymer, and nano-silica to a reactor and stir at 50-80°C for 40-50 minutes to thoroughly mix. Then, add the coupling agent and continue stirring for 20-30 minutes. After cooling to room temperature, add the curing agent and stir for 15-20 minutes. Finally, add the defoamer and stir for 10-15 minutes to eliminate bubbles in the system. This results in a one-component epoxy resin adhesive. The prepared adhesive is sealed and stored in a cool, dry place.

[0040] In one implementation of the present invention, the preparation method of the nylon soft brush tip comprises:

[0041] The prepared nylon fibers are bundled according to the number of strands, and the stranded fibers enter the shaking machine under the drawing action of the hub (drawing speed is 2.4mm / s); then the fiber bundles enter the shaping hot box, and the shaping temperature is 220℃, so that the fibers on the surface of the rod are bonded together under the action of heat; the shaped rods are pulled to the dipping tank, and the gluing time is 140s, and then the rods enter the low-temperature oven (temperature 80℃) to evaporate the solvent in the adhesive; then the rods enter the high-temperature oven (temperature 130℃) for rod foaming molding, and after molding, the rods are cut into 1m rods under traction; according to the size of the prepared pen tip, they are cut into short rods, and then sent to the grinding head workshop to be ground into the required shape (pen tip shapes include but are not limited to brush head and duckbill types), and the dust inside and outside the pen tip is cleaned after grinding, and finally dried to obtain the nylon soft pen tip.

[0042] Based on the same inventive concept, the present invention also provides an alcohol marker pen comprising a nylon soft pen tip, a pen holder, and a core containing alcohol ink, wherein the nylon soft pen tip is the nylon soft pen tip described above. The alcohol marker pen has the function of preventing ink from discoloring.

[0043] The following is a further explanation of the nylon soft brush tip and its preparation method provided by the present invention through specific preparation examples.

[0044] Example 1

[0045] Preparation of modified nylon pen tip synthetic material

[0046] Weigh 50 parts by weight of copolymer-modified nylon, 5 parts of nano-silica, 5 parts of maleic anhydride-grafted polypropylene, 0.5 parts of antioxidant, and 0.5 parts of ultraviolet absorber. Add these components to a high-speed mixer and mix at 70°C for 15 minutes to thoroughly mix the components. Add the mixed materials to a twin-screw extruder and melt-extrude at 240°C for granulation to obtain a modified nylon pen tip synthetic material.

[0047] Preparation of modified nylon pen tip adhesive

[0048] Weigh 50 parts of epoxy resin, 20 parts of polyurethane prepolymer, 5 parts of reactive diluent, 10 parts of curing agent, 3 parts of nano-silica, 1 part of silane coupling agent, 0.5 parts of defoaming agent, and 1 part of ultraviolet absorber by weight. First, add the epoxy resin, epoxy reactive diluent, nano-silica, silane coupling agent, and polyurethane prepolymer to a reactor and stir evenly at 80°C. Then add the reactive diluent and continue stirring for 20 minutes. Finally, add the curing agent, defoaming agent, and ultraviolet absorber and stir for 20 minutes to fully mix the components to obtain a modified nylon pen tip adhesive.

[0049] Pen tip production and testing

[0050] Using the prepared modified nylon nib synthetic fiber material and modified nylon nib adhesive, a duckbill nylon soft nib was fabricated through a fiber nib bonding process. A core filled with alcohol ink was placed within the bonded pen barrel and left for 24 hours before a writing test. The results showed no discoloration of the alcohol ink during writing, and the writing was smooth and legible.

[0051] Example 2

[0052] Preparation of modified nylon pen tip synthetic material

[0053] Weigh 60 parts of copolymer-modified nylon, 10 parts of nano-silica, 8 parts of maleic anhydride-grafted polypropylene, 0.5 parts of antioxidant, and 1 part of ultraviolet absorber according to weight.

[0054] The above components were added to a high-speed mixer and mixed at 70°C for 15 minutes to ensure that the components were fully mixed. The mixed materials were added to a twin-screw extruder and melt-extruded at 260°C and granulated to obtain a modified nylon pen tip synthetic material.

[0055] Preparation of modified nylon pen tip adhesive

[0056] Weigh 65 parts of epoxy resin, 20 parts of polyurethane prepolymer, 5 parts of reactive diluent, 10 parts of curing agent, 3 parts of nano-silica, 1 part of silane coupling agent, 0.5 parts of defoaming agent, and 1 part of ultraviolet absorber by weight. First, add the epoxy resin, epoxy reactive diluent, nano-silica, silane coupling agent, and polyurethane prepolymer to a reactor and stir evenly at 80°C. Then add the reactive diluent and continue stirring for 20 minutes. Finally, add the curing agent, defoaming agent, and ultraviolet absorber and stir for 15 minutes to fully mix the components to obtain a modified nylon pen tip adhesive.

[0057] Pen tip production and testing

[0058] Using the prepared modified nylon nib synthetic fiber material and modified nylon nib adhesive, a duckbill nylon soft nib was fabricated through a fiber nib bonding process. A core filled with alcohol ink was placed within the bonded pen barrel and left for 24 hours before a writing test. The results showed no discoloration of the alcohol ink during writing, and the writing was smooth and legible.

[0059] Example 3

[0060] Preparation of modified nylon pen tip synthetic material

[0061] Weigh 65 parts of copolymer-modified nylon, 12 parts of nano-silica, 10 parts of maleic anhydride-grafted polypropylene, 1 part of antioxidant, and 1 part of ultraviolet absorber according to weight.

[0062] The above components were added to a high-speed mixer and mixed at 100°C for 10 minutes to ensure that the components were fully mixed. The mixed materials were added to a twin-screw extruder and melt-extruded at 270°C and granulated to obtain a modified nylon pen tip synthetic material.

[0063] Preparation of modified nylon pen tip adhesive

[0064] Weigh 70 parts of epoxy resin, 35 parts of polyurethane prepolymer, 5 parts of reactive diluent, 20 parts of curing agent, 3 parts of nano-silica, 1.5 parts of silane coupling agent, 0.5 parts of defoaming agent, and 1 part of ultraviolet absorber by weight. First, add the epoxy resin, epoxy reactive diluent, nano-silica, silane coupling agent, and polyurethane prepolymer to a reactor and stir evenly at 80°C. Then add the reactive diluent and continue stirring for 20 minutes. Finally, add the curing agent, defoaming agent, and ultraviolet absorber and stir for 15 minutes to fully mix the components to obtain a modified nylon pen tip adhesive.

[0065] Pen tip production and testing

[0066] The prepared modified nylon pen tip synthetic fiber material and the modified nylon pen tip adhesive are used to manufacture a duckbill-shaped nylon soft pen tip through a fiber pen tip bonding process.

[0067] The core containing alcohol ink was installed in the bonded pen barrel and left for 24 hours before a writing test. The results showed that the alcohol ink did not change color during the writing process, and the writing was smooth and clear.

[0068] Comparative Example 1

[0069] Preparation of modified nylon pen tip synthetic material

[0070] Weigh 50 parts of nylon PA66, 5 parts of nano-silicon dioxide, 5 parts of maleic anhydride grafted polypropylene, 0.5 parts of antioxidant, and 0.5 parts of ultraviolet absorber according to weight.

[0071] The above components were added to a high-speed mixer and mixed at 70°C for 15 minutes to ensure that the components were fully mixed. The mixed materials were added to a twin-screw extruder and melt-extruded at 240°C and granulated to obtain a modified nylon pen tip synthetic material.

[0072] Preparation of modified nylon pen tip adhesive

[0073] Weigh 50 parts of epoxy resin, 20 parts of polyurethane prepolymer, 5 parts of reactive diluent, 10 parts of curing agent, 3 parts of nano-silica, 1 part of silane coupling agent, 0.5 parts of defoaming agent, and 1 part of ultraviolet absorber by weight. First, add the epoxy resin, epoxy reactive diluent, nano-silica, silane coupling agent, and polyurethane prepolymer to a reactor and stir evenly at 80°C. Then add the reactive diluent and continue stirring for 20 minutes. Finally, add the curing agent, defoaming agent, and ultraviolet absorber and stir for 20 minutes to fully mix the components to obtain a modified nylon pen tip adhesive.

[0074] Pen tip production and testing

[0075] Using the prepared modified nylon pen tip synthetic fiber material and modified nylon pen tip adhesive, a duckbill nylon soft pen tip was produced through a fiber pen tip bonding process. A core filled with alcohol ink was placed within the bonded pen holder and left for 24 hours before a writing test. The results showed that the alcohol ink changed color during writing, but writing was smooth and legible.

[0076] Comparative Example 2

[0077] Preparation of modified nylon pen tip synthetic material

[0078] Weigh 50 parts of copolymer-modified nylon, 5 parts of nano-silica, 5 parts of maleic anhydride-grafted polypropylene, 0.5 parts of antioxidant, and 0.5 parts of ultraviolet absorber according to weight.

[0079] Add the above components into a high-speed mixer and mix at 70°C for 15 minutes to ensure that the components are fully mixed.

[0080] The mixed materials are added into a twin-screw extruder, melt-extruded at 240° C., and granulated to obtain a modified nylon pen tip synthetic material.

[0081] Commercially available polyurethane adhesives

[0082] Pen tip production and testing

[0083] Using the prepared modified nylon pen tip synthetic fiber material and modified nylon pen tip adhesive, a duckbill-shaped nylon soft pen tip was produced through a fiber pen tip bonding process. A core filled with alcohol ink was installed within the bonded pen holder and left for 24 hours before writing tests. The results showed that the alcohol ink discolored during writing, the writing felt hollow, and the pen tip developed burrs.

[0084] Table 1

[0085]

[0086]

[0087] Result Analysis

[0088] The ink pens obtained from Examples 1 to 3 and Comparative Examples 1 to 2 were tested for discoloration, writing smoothness, and whether the pen tip was burred, as shown in Table 1. The alcohol ink pens of Examples 1 to 3 showed no discoloration when written, while the alcohol ink pens of Comparative Examples 1 to 2 showed discoloration when written, indicating that the copolymerized modified nylon and the modified pen tip adhesive had good chemical resistance and the ink did not chemically react with the pen tip material and adhesive; the hollowness and burrs in the writing of Comparative Example 2 indicated that the pen tip adhesive was corroded by the alcohol ink, resulting in a chemical reaction and poor ink discharge; the discoloration of the ink in Comparative Examples 1 and 2 indicated that both the ink pen tip and the adhesive would affect the discoloration of the ink writing.

[0089] In summary, the present invention effectively solves the problem of discoloration caused by contact between nylon pen tips and alcohol ink by optimizing and modifying the formula of the nylon pen tip synthetic material and adhesive. The components of the modified nylon pen tip synthetic material work synergistically, improving the material's chemical stability and density. The modified nylon pen tip adhesive exhibits excellent bonding properties and chemical resistance, effectively isolating alcohol ink from the nylon pen tip, preventing ink discoloration, and improving the performance and quality of writing instruments, thus possessing broad market application prospects.

[0090] It should be understood that the present invention is not limited to the precise construction described and illustrated above and that various modifications and variations can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A nylon soft pen tip, comprising a fiber bundle formed of a nylon pen tip synthetic material and an adhesive, characterized in that: The nylon pen tip synthetic material comprises, by weight, 50-80 parts of copolymer modified nylon, 5-15 parts of nano silicon dioxide, 5-10 parts of maleic anhydride grafted polypropylene, 0.5-1.5 parts of antioxidant, and 0.5-1.5 parts of ultraviolet absorber.

2. The nylon soft brush tip according to claim 1, characterized in that: The adhesive comprises, by weight, 50-70 parts of epoxy resin, 20-35 parts of polyurethane prepolymer, 5-10 parts of active diluent, 10-20 parts of curing agent, 3-8 parts of nano silicon dioxide, 1-3 parts of ultraviolet absorber, 1-3 parts of silane coupling agent and 0.5-1.5 parts of defoaming agent.

3. The nylon soft brush tip according to claim 1, characterized in that: The copolymer modified nylon is obtained by introducing a benzene ring structure monomer or a tetrafluoroethylene monomer into the copolymer nylon for copolymerization reaction; or by subjecting the copolymer nylon to oxygen plasma treatment and grafting methyl methacrylate.

4. The nylon soft brush tip according to claim 1, characterized in that: The copolymer modified nylon is obtained by introducing melamine resin or amino resin into the copolymer nylon for cross-linking reaction modification.

5. The nylon soft brush tip according to claim 1, characterized in that: The copolymer modified nylon comprises, by weight, 50-70 parts of caprolactam, 30-50 parts of modified PA66 monomer, 0.01-0.1 parts of phosphorylating agent and 0.1-1 parts of acetic acid molecular weight regulator.

6. The nylon soft brush tip according to claim 1, characterized in that: The particle size of the nano-silicon dioxide is less than 100 nm.

7. The nylon soft brush tip according to claim 1, characterized in that: The preparation method of nylon pen tip synthetic fiber comprises: The copolymer modified nylon after dehydration is mixed with nano silicon dioxide, maleic anhydride grafted polypropylene, an antioxidant and an ultraviolet absorber to obtain a mixed material; The mixed material is added to a twin-screw extruder and melt-extruded to obtain a modified synthetic material; the temperature of the screw extruder is set to: zone 1 temperature 210-220°C, zone 2 temperature 220-240°C, zone 3 temperature 240-260°C, zone 4 temperature 250-270°C, and die head temperature 260-270°C; The modified synthetic material is subjected to a wire drawing process to obtain the nylon pen tip synthetic fiber.

8. The nylon soft brush tip according to claim 2, characterized in that: The polyurethane prepolymer is a fluorine-containing polyurethane prepolymer; and the active diluent is an epoxy active diluent.

9. A method for preparing the nylon soft brush tip according to claim 1, characterized in that: include: The nylon pen tip synthetic fibers are bundled according to the number of strands, and the stranded fibers are drawn into a yarn shaker by a hub to obtain the fiber bundles; shaping the fiber bundle, and then introducing the fiber bundle into a dipping tank for dipping; After the glue is added, foaming is carried out under the added conditions to obtain the rod material; According to the size of the prepared pen tip, the rod material is cut into short rods, and the nylon soft pen tip is obtained after grinding, cleaning and drying.

10. An alcohol marker, characterized in that: The invention comprises a pen body, a core filled with alcohol ink, and a nylon soft brush head according to any one of claims 1 to 8, wherein the nylon soft brush head is installed at at least one end of the pen body, and the core is installed in the pen body and connected to the nylon soft brush head.

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