A bakelite nib, a method for manufacturing the same and a fountain pen having the same

Abstract

The application belongs to the technical field of high polymer materials, and discloses a rubber pen tongue, a preparation method thereof and a pen with the rubber pen tongue. Through step (1), mixing and dense mixing, dense mixing particles are obtained; through step (2), a pen tongue blank is prepared; through step (3), a hydrophilic polymer filter membrane is cut into a strip-shaped polymer filter strip and wound on the pen tongue blank to obtain a semi-finished product; and through step (4), the semi-finished product is heated to 100 DEG C to 250 DEG C under vacuum condition, and kept warm for 3 min to 5 min, and then the rubber pen tongue is obtained after trimming after cooling. The scheme omits a complicated surface hydrophilic modification process, and has the advantages of simple process flow, easy realization, stable product quality, low requirement on equipment, and environmental protection of the process method and material selection.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, in particular to a bakelite feed and a preparation method thereof, and a fountain pen with the bakelite feed. Background Art

[0002] Most fountain pen inks are water-based. Bakelite nibs, primarily composed of matrix materials and butadiene rubber, have poor hydrophilicity, leading to poor ink flow and increased adhesion to the nib surface, resulting in ink breakage and impaired writing. CN104292486B discloses a nib wetting treatment solution and its use method. The nib wetting treatment solution comprises an organic surfactant and a humectant, wherein the organic surfactant is used in an amount of 0.1 to 50 g / l and the humectant is used in an amount of 0.1 to 100 g / l. The roughened nib is immersed in the nib wetting treatment solution for a specified period of time, then removed, spin-dried, and dried at 40 to 60°C. This invention soaks the roughened nib in a wetting treatment solution containing a surfactant and a humectant, allowing the surfactant and humectant to adsorb onto the nib surface, achieving the goal of improving plastic surface wettability and accelerating ink release. CN106827486A discloses a method and application for improving the surface wettability of a fountain pen nib using air plasma. Under a certain vacuum, plasma discharge is used to modify the surface wettability of the nib. The present invention uses air plasma to treat the nib, imparting excellent wettability, achieving rapid ink release and preventing ink loss. Furthermore, the surface of the nib treated with air plasma is more aesthetically pleasing than that treated with a sulfuric acid-chromic acid solution. Both methods improve the hydrophilicity of the nib through surface treatment, but these methods gradually lose their effectiveness over time. Summary of the Invention

[0003] To solve the above problems, the present invention provides a bakelite feed and a preparation method thereof, and a fountain pen with a bakelite feed, which eliminates the complicated surface hydrophilic modification process, has a simple process flow and is easy to implement, and the resulting product has the characteristics of stable quality.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] This solution proposes a method for preparing a bakelite pen tongue, comprising the following steps:

[0006] Step (1), mixing: after uniformly blending 10 to 15 parts of a matrix material, 0.3 to 1 part of cellulose and 1 to 8 parts of butadiene rubber by weight, add 1.5 to 2 parts of a vulcanizing agent, 1 to 3 parts of a recycled powder, 1 to 1.5 parts of an oil agent and 2 to 4 parts of a filler, stir uniformly, and knead under anaerobic conditions to obtain kneaded particles;

[0007] Step (2), preparing a nib blank: putting the mixed granules into a molding device, molding, and obtaining a nib blank; polishing the nib blank, and cleaning the surface to obtain a nib blank;

[0008] Step (3) preparing a semi-finished product: immersing a hydrophilic polymer filter membrane into a filler suspension, taking it out after being fully soaked, dehydrating it, and then cutting it into a strip-shaped polymer filter belt; immersing the polymer filter belt in an alcohol solution of a plasticizer for 1s to 5s, taking it out and dealcoholizing it, and then winding it around a pen tongue blank to obtain a semi-finished product; in the semi-finished product, the winding thickness of the polymer filter belt is 1mm to 2mm; the filtration accuracy of the hydrophilic polymer filter membrane is 50μm to 100μm;

[0009] Step (4), preparing the bakelite pen tongue: placing the semi-finished product under vacuum conditions and heating it to 100°C~250°C, keeping it warm for 3min~5min, cooling it and then shaping it to obtain the bakelite pen tongue.

[0010] The method for preparing the bakelite pen tongue in this scheme has the following characteristics:

[0011] 1. A surface hydrophilic effect is obtained by winding a hydrophilic polymer filter membrane on the surface of a conventional bakelite pen tongue. The hydrophilic polymer filter membrane has a good hydrophilic effect. The prepared polymer filter belt can obtain excellent hydrophilicity when wound on the bakelite pen tongue. However, there are a large number of micropores on its surface. If not treated, these micropores will cause the ink to be rapidly guided to the pen tip, resulting in ink leakage. Taking this into consideration, this scheme has made further improvement measures. In step (4), the micropores can be blocked by keeping the temperature at 100℃~250℃ under vacuum conditions for 3min~5min, and micro pits can be formed on the surface. The polymer filter belt is immersed in a plasticizer alcohol solution for 1s~5s, taken out and dealcoholized, and then wound on the pen tongue blank. The plasticizer is evenly distributed on the polymer filter belt. The plasticizer can lower the melting point of the polymer filter belt, so that the polymer filter belt can basically melt under vacuum conditions of 100℃~250℃ in step (4). In the vacuum environment, the micropores in the film gradually merge into bubbles and overflow. The hydrophilic polymer filter membrane used to prepare the polymer filter belt is relatively expensive, so the winding thickness should not be too large. More importantly, in step (4), the semi-finished product is kept at 100°C to 250°C under vacuum conditions for 3 to 5 minutes. If the thickness is too large, the temperature distribution in the semi-finished product will be difficult to control, which will easily lead to a decrease in the shear strength of the polymer filter belt and the pen tongue blank.

[0012] 2. Strengthen the surface. The hydrophilic polymer filter membrane has good toughness, but its strength is relatively low. In this solution, the surface of the pen tongue blank is polished to make the surface of the pen tongue blank rough, thereby increasing the friction when the polymer filter belt is wound, so that the polymer filter belt can be better wound. At the same time, it can also ensure that the polymer filter belt can be more tightly combined with the pen tongue blank during heating and remolding under vacuum conditions in step (4). Furthermore, the hydrophilic polymer filter membrane is immersed in a filler suspension. The filler remaining on its surface after dehydration can enhance its strength. At the same time, different functional fillers can be selected according to needs, such as nano-titanium dioxide to enhance antioxidant properties.

[0013] 3. Improved uniformity and strength are achieved through banburying. Existing technologies typically produce the nib by directly extruding or injection molding the mixed materials. This solution incorporates a banburying process, where the materials are initially mixed and granulated at high temperatures before entering an extruder or injection molding machine for further processing. This ensures more uniform mixing of the materials and initiates the initial vulcanization reaction of the rubber. This allows for further reactions during subsequent processing, integrating some of the components into the vulcanization network and enhancing the strength and toughness of the nib blank.

[0014] Preferably, in step (1), the matrix material is raw rubber; the oil agent is one of engine oil, soybean oil or paraffin oil; the recycled powder is bakelite recycled powder; the filler is one or more of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder; and the vulcanizing agent is one or more of sulfur, TMTD, benzoyl peroxide, quinone oxime compound, polysulfide polymer, ethyl carbamate, and maleimide derivative.

[0015] This solution uses the above materials to create a nib blank, which then needs to be wrapped with a polymer filter belt. The primary focus for the resulting nib blank is strength, so a relatively high amount of vulcanizer is added. The oil acts as a plasticizer, and the filler acts as a strengthening agent.

[0016] Preferably, in step (1), the process of banburying under anaerobic conditions is as follows: the uniformly stirred materials are put into a banbury mixer, and banburying is carried out at 80°C to 100°C for 20 to 40 minutes under vacuum or nitrogen atmosphere protection to obtain banburying particles.

[0017] The main purpose of internal mixing is to fully mix the materials and initially vulcanize the raw rubber, while improving the production efficiency of subsequent processes.

[0018] Preferably, in step (2), the molding equipment is an extruder or an injection molding machine; and the molding process is extrusion molding or injection molding.

[0019] Preferably, in step (2), the surface roughness Ra of the brush tongue blank after surface grinding is 1.6 μm to 6.3 μm.

[0020] Preferably, in step (3), the suspended particles in the filler suspension are one or more of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder; and the mass proportion of the suspended particles is 5% to 10%.

[0021] The liquid phase of the filler suspension is water. The hydrophilic polymer filter membrane is immersed in the filler suspension and needs to be dehydrated after being fully soaked.

[0022] Preferably, in step (3), the hydrophilic polymer filter membrane is one of a polyethersulfone filter membrane, a polycarbonate filter membrane, and a cellulose ester filter membrane.

[0023] In this solution, the filtration accuracy of the hydrophilic polymer filtration membrane should not be too high, that is, it should not be less than 50 μm. In this solution, the micropores of the hydrophilic polymer filtration membrane are used to create surface pits for storing ink. If the accuracy is too high, that is, the pore size is smaller, then the bubbles formed by the gradual merging of the micropores in the film in step (4) will be too small, and the pit size formed after overflow will be too small, resulting in a poor hydrophilic effect.

[0024] Preferably, in step (3), in the alcohol solution of the plasticizer, the plasticizer is one of aliphatic dibasic acid ester plasticizer, fatty acid ester plasticizer, and benzene polyester plasticizer, and the alcohol is ethanol; the mass proportion of the plasticizer in the alcohol solution of the plasticizer is 5% to 10%.

[0025] Preferably, in step (3), the dealcoholization method is: standing for 3 min to 5 min under 0.01 MPa to 0.05 MPa conditions for dealcoholization.

[0026] Leaving it in the air and waiting for the alcohol to evaporate is also a feasible solution, but it is less efficient.

[0027] This solution also proposes a bakelite pen feed prepared by the above bakelite pen feed preparation method.

[0028] This solution also proposes a fountain pen with a bakelite feed prepared by the above bakelite feed preparation method.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. This solution achieves a surface hydrophilic effect by wrapping a hydrophilic polymer filter membrane around the surface of a conventional bakelite pen feed. It further utilizes the thermoplastic properties of the hydrophilic polymer filter membrane raw material to firmly attach it to the pen feed blank by heating, giving the pen feed a very good hydrophilic effect. At the same time, it further utilizes the micropores of the hydrophilic polymer filter membrane to overflow to the surface during the heating and remolding process, forming a pit structure, which is conducive to storing ink.

[0031] 2. This solution utilizes the characteristics of the material itself, eliminating the complicated surface hydrophilic modification process. The process flow is simple and easy to implement. At the same time, the product has stable quality, low equipment requirements, and environmentally friendly process methods and material selection. DETAILED DESCRIPTION

[0032] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0033] Example 1

[0034] A method for preparing a bakelite pen tongue comprises the following steps:

[0035] Step (1), mixing: after uniformly blending 10 parts of raw rubber, 0.3 parts of cellulose and 3 parts of butadiene rubber by weight, add 1.5 parts of sulfur, 2 parts of bakelite recycled powder, 1 part of engine oil, 1 part of carbon black powder, 1 part of white carbon black powder and 1 part of calcium carbonate powder, stir evenly, put into an internal mixer, and mix at 90°C for 20 minutes under the protection of nitrogen atmosphere to obtain internally mixed particles;

[0036] Step (2), preparing a nib blank: putting the mixed granules into an extrusion molding device, extruding and molding to obtain a nib blank, polishing the surface of the nib blank, and cleaning it to obtain a nib blank with a surface roughness Ra of 2.3 μm;

[0037] Step (3) is to prepare a semi-finished product: immerse a polyethersulfone filter membrane with a filtration accuracy of 50 μm in a filler suspension containing 8% by mass of suspended particles, wherein the suspended particles are a mixture of equal proportions of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder; the liquid phase in the filler suspension is water, and after being fully soaked, the filter is taken out, dehydrated, and cut into a strip-shaped polymer filter belt; the polymer filter belt is immersed in an ethanol solution containing a fatty acid ester plasticizer with a mass ratio of 5% for 3 seconds, taken out, and placed under 0.03 MPa for 5 minutes for dealcoholization, and then wound on a pen tongue blank to obtain a semi-finished polymer filter belt with a winding thickness of 1 mm;

[0038] Step (4), preparing the bakelite pen tongue: placing the semi-finished product under vacuum conditions and heating it to 240°C, keeping it warm for 3 minutes, cooling it and then reshaping it to obtain the bakelite pen tongue.

[0039] Example 2

[0040] A method for preparing a bakelite pen tongue comprises the following steps:

[0041] Step (1), mixing: after uniformly blending 15 parts of raw rubber, 0.8 parts of cellulose and 6 parts of butadiene rubber by weight, add 1.5 parts of polysulfide polymer, 2 parts of bakelite recycled powder, 1 part of engine oil, 1 part of titanium dioxide powder, 1 part of magnesium oxide powder and 1 part of calcium carbonate powder, stir evenly, put into an internal mixer, and mix under vacuum at 80°C for 30 minutes to obtain internally mixed particles;

[0042] Step (2), preparing a nib blank: putting the mixed granules into an injection molding machine, injection molding, obtaining a nib blank, polishing the nib blank, and cleaning the nib blank to obtain a nib blank with a surface roughness Ra of 5.2 μm;

[0043] Step (3), preparing a semi-finished product: immersing a polycarbonate filter membrane with a filtration accuracy of 80 μm into a filler suspension containing 5% by mass of suspended particles, wherein the suspended particles are a mixture of equal proportions of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder; the liquid phase in the filler suspension is water, and after being fully infiltrated, the membrane is taken out, dehydrated, and cut into a strip-shaped polymer filter belt; the polymer filter belt is immersed in an ethanol solution containing an aliphatic dibasic acid ester plasticizer with a mass ratio of 8% for 5 seconds, taken out, and placed under 0.05 MPa for 4 minutes for dealcoholization, and then wound on a pen tongue blank to obtain a semi-finished polymer filter belt with a winding thickness of 2 mm;

[0044] Step (4), preparing the bakelite pen tongue: placing the semi-finished product under vacuum conditions and heating it to 220°C, keeping it warm for 5 minutes, cooling it and then reshaping it to obtain the bakelite pen tongue.

[0045] Example 3

[0046] A method for preparing a bakelite pen tongue comprises the following steps:

[0047] Step (1), mixing: after uniformly blending 12 parts of raw rubber, 0.8 parts of cellulose and 6 parts of butadiene rubber by weight, add 2 parts of sulfur, 3 parts of bakelite recycled powder, 1 part of soybean oil, 1 part of titanium dioxide powder, 1 part of magnesium oxide powder and 1 part of calcium carbonate powder, stir evenly, put into an internal mixer, and mix under vacuum at 90°C for 40 minutes to obtain internally mixed particles;

[0048] Step (2), preparing a nib blank: putting the mixed granules into an injection molding machine, injection molding, obtaining a nib blank, polishing the nib blank, and cleaning the nib blank to obtain a nib blank with a surface roughness Ra of 4.6 μm;

[0049] Step (3) preparing a semi-finished product: immersing a cellulose ester filter membrane with a filtration accuracy of 100 μm into a filler suspension containing 10% by mass of suspended particles, wherein the suspended particles are a mixture of equal proportions of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder; the liquid phase in the filler suspension is water, and after being fully soaked, the membrane is taken out, dehydrated, and cut into a strip-shaped polymer filter belt; the polymer filter belt is immersed in an ethanol solution containing a fatty acid ester plasticizer with a mass ratio of 5% for 5 seconds, taken out, and placed under 0.03 MPa for 3 minutes for dealcoholization, and then wound on a pen tongue blank to obtain a semi-finished polymer filter belt with a winding thickness of 1.5 mm;

[0050] Step (4), preparing the bakelite pen tongue: heating the semi-finished product to 200°C under vacuum conditions, keeping the temperature for 3 minutes, and then cooling and shaping it to obtain the bakelite pen tongue.

[0051] Comparative Example 1

[0052] A method for preparing a bakelite pen tongue is prepared by the following steps:

[0053] In parts by weight, 15 parts of raw rubber, 0.8 parts of cellulose and 6 parts of butadiene rubber are evenly blended, and then 1.5 parts of polysulfide polymer, 2 parts of bakelite recycled powder, 1 part of engine oil, 1 part of titanium dioxide powder, 1 part of magnesium oxide powder, and 1 part of calcium carbonate powder are added. The mixture is stirred evenly and put into injection molding equipment. After injection molding, the mixture is reshaped and cleaned to obtain a bakelite pen tongue.

[0054] Comparative Example 2

[0055] A method for preparing a bakelite pen tongue comprises the following steps:

[0056] Step (1), mixing: after uniformly blending 10 parts of raw rubber, 0.3 parts of cellulose and 3 parts of butadiene rubber by weight, add 1.5 parts of sulfur, 2 parts of bakelite recycled powder, 1 part of engine oil, 1 part of carbon black powder, 1 part of white carbon black powder and 1 part of calcium carbonate powder, stir evenly, put into an internal mixer, and mix at 90°C for 20 minutes under the protection of nitrogen atmosphere to obtain internally mixed particles;

[0057] Step (2), preparing a nib blank: putting the mixed granules into an extrusion molding device, extruding and molding to obtain a nib blank, polishing the surface of the nib blank, and cleaning it to obtain a nib blank with a surface roughness Ra of 2.3 μm;

[0058] Step (3) is to prepare a semi-finished product: immerse a polyethersulfone filter membrane with a filtration accuracy of 10 μm in a filler suspension containing 8% by mass of suspended particles, wherein the suspended particles are a mixture of equal proportions of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder; the liquid phase in the filler suspension is water, and after being fully soaked, the filter is taken out, dehydrated, and cut into a strip-shaped polymer filter belt; the polymer filter belt is immersed in an ethanol solution containing a fatty acid ester plasticizer with a mass ratio of 5% for 3 seconds, taken out, and placed under 0.03 MPa for 5 minutes for dealcoholization, and then wound on a pen tongue blank to obtain a semi-finished polymer filter belt with a winding thickness of 1 mm;

[0059] Step (4), preparing the bakelite pen tongue: placing the semi-finished product under vacuum conditions and heating it to 240°C, keeping it warm for 3 minutes, cooling it and then reshaping it to obtain the bakelite pen tongue.

[0060] Comparative Example 3

[0061] A method for preparing a bakelite pen tongue comprises the following steps:

[0062] Step (1), mixing: after uniformly blending 10 parts of raw rubber, 0.3 parts of cellulose and 3 parts of butadiene rubber by weight, add 1.5 parts of sulfur, 2 parts of bakelite recycled powder, 1 part of engine oil, 1 part of carbon black powder, 1 part of white carbon black powder and 1 part of calcium carbonate powder, stir evenly, and then put into an extrusion molding equipment, extrude and mold to obtain a pen tongue blank, grind the surface of the pen tongue blank, and wash it to obtain a pen tongue blank with a surface roughness Ra of 2.3 μm;

[0063] Step (2), preparing a semi-finished product: immersing a polyethersulfone filter membrane with a filtration accuracy of 50 μm into a filler suspension containing 8% by mass of suspended particles, wherein the suspended particles are a mixture of equal proportions of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder; the liquid phase in the filler suspension is water, and after being fully soaked, the membrane is taken out, dehydrated, and cut into a strip-shaped polymer filter belt; the polymer filter belt is immersed in an ethanol solution containing a fatty acid ester plasticizer with a mass ratio of 5% for 3 seconds, taken out, and placed under 0.03 MPa for 5 minutes for dealcoholization, and then wound on a pen tongue blank to obtain a semi-finished polymer filter belt with a winding thickness of 1 mm;

[0064] Step (3), preparing the bakelite pen tongue: placing the semi-finished product under vacuum conditions and heating it to 240°C, keeping it warm for 3 minutes, cooling it and then reshaping it to obtain the bakelite pen tongue.

[0065] Comparative Example 4

[0066] A method for preparing a bakelite pen tongue comprises the following steps:

[0067] Step (1), mixing: after uniformly blending 10 parts of raw rubber, 0.3 parts of cellulose and 3 parts of butadiene rubber by weight, add 1.5 parts of sulfur, 2 parts of bakelite recycled powder, 1 part of engine oil, 1 part of carbon black powder, 1 part of white carbon black powder and 1 part of calcium carbonate powder, stir evenly, put into an internal mixer, and mix at 90°C for 20 minutes under the protection of nitrogen atmosphere to obtain internally mixed particles;

[0068] Step (2), preparing a nib blank: putting the mixed granules into an extrusion molding device, extruding and molding to obtain a nib blank, polishing the surface of the nib blank, and cleaning it to obtain a nib blank with a surface roughness Ra of 2.3 μm;

[0069] Step (3) is to prepare a semi-finished product: immerse a polyethersulfone filter membrane with a filtration accuracy of 50 μm in a filler suspension containing 8% by mass of suspended particles, wherein the suspended particles are a mixture of equal proportions of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder; the liquid phase in the filler suspension is water, and after being fully soaked, the membrane is taken out, dehydrated, and cut into a strip-shaped polymer filter belt; the polymer filter belt is immersed in an ethanol solution containing a fatty acid ester plasticizer with a mass ratio of 5% for 3 seconds, taken out, and placed under 0.03 MPa for 5 minutes for dealcoholization, and then wound on a pen tongue blank to obtain a semi-finished polymer filter belt with a winding thickness of 5 mm;

[0070] Step (4), preparing the bakelite pen tongue: placing the semi-finished product under vacuum conditions and heating it to 240°C, keeping it warm for 3 minutes, cooling it and then reshaping it to obtain the bakelite pen tongue.

[0071] Comparative Example 5

[0072] A method for preparing a bakelite pen tongue comprises the following steps:

[0073] Step (1), mixing: after uniformly blending 10 parts of raw rubber, 0.3 parts of cellulose and 3 parts of butadiene rubber by weight, add 1.5 parts of sulfur, 2 parts of bakelite recycled powder, 1 part of engine oil, 1 part of carbon black powder, 1 part of white carbon black powder and 1 part of calcium carbonate powder, stir evenly, put into an internal mixer, and mix at 90°C for 20 minutes under the protection of nitrogen atmosphere to obtain internally mixed particles;

[0074] Step (2), preparing a nib blank: putting the mixed granules into an extrusion molding device, extruding and molding to obtain a nib blank, polishing the surface of the nib blank, and cleaning it to obtain a nib blank with a surface roughness Ra of 2.3 μm;

[0075] Step (3) is to prepare a semi-finished product: immerse a polyethersulfone filter membrane with a filtration accuracy of 50 μm in a filler suspension containing 8% by mass of suspended particles, wherein the suspended particles are a mixture of equal proportions of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder; the liquid phase in the filler suspension is water, and after being fully soaked, the filter is taken out, dehydrated, and cut into a strip-shaped polymer filter belt; the polymer filter belt is immersed in an ethanol solution containing a fatty acid ester plasticizer with a mass ratio of 5% for 3 seconds, taken out, and placed under 0.03 MPa for 5 minutes for dealcoholization, and then wound on a pen tongue blank to obtain a semi-finished polymer filter belt with a winding thickness of 1 mm;

[0076] Step (4), preparing the bakelite pen tongue: heating the semi-finished product to 240°C, keeping the temperature for 3 minutes, cooling it, and then reshaping it to obtain the bakelite pen tongue.

[0077] Comparative Example 6

[0078] A method for preparing a bakelite pen tongue comprises the following steps:

[0079] Step (1), mixing: after uniformly blending 10 parts of raw rubber, 0.3 parts of cellulose and 3 parts of butadiene rubber by weight, add 1.5 parts of sulfur, 2 parts of bakelite recycled powder, 1 part of engine oil, 1 part of carbon black powder, 1 part of white carbon black powder and 1 part of calcium carbonate powder, stir evenly, put into an internal mixer, and mix at 90°C for 20 minutes under the protection of nitrogen atmosphere to obtain internally mixed particles;

[0080] Step (2), preparing a nib blank: putting the mixed granules into an extrusion molding device, extruding and molding to obtain a nib blank, polishing the surface of the nib blank, and cleaning it to obtain a nib blank with a surface roughness Ra of 2.3 μm;

[0081] Step (3) is to prepare a semi-finished product: immerse the PE film in a filler suspension containing 8% by weight of suspended particles, wherein the suspended particles are a mixture of equal proportions of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder; the liquid phase in the filler suspension is water, and the film is taken out after being fully soaked, dehydrated, and cut into a strip-shaped polymer filter belt; the polymer filter belt is immersed in an ethanol solution containing a fatty acid ester plasticizer with a mass ratio of 5% for 3 seconds, taken out, and placed under 0.03 MPa for 5 minutes for dealcoholization, and then wound on a pen tongue blank to obtain a semi-finished polymer filter belt with a winding thickness of 5 mm;

[0082] Step (4), preparing the bakelite pen tongue: placing the semi-finished product under vacuum conditions and heating it to 240°C, keeping it warm for 3 minutes, cooling it and then reshaping it to obtain the bakelite pen tongue.

[0083] Performance testing:

[0084] 1. Hydrophilicity test: Drop 0.1 mL of ink on the surface of the bakelite pen tongue prepared in Examples 1 to 3 and Comparative Examples 1 to 6, and measure the time required for the ink to spread completely. The shorter the time, the better the hydrophilic effect.

[0085] 2. Writing test: The bakelite pen tongues prepared in Examples 1 to 3 and Comparative Examples 1 to 6 were made into fountain pens, and the writing effect was tested, including the ink flow time of the first writing and the ink flow effect during the 30-min writing process.

[0086] The test results are shown in Table 1.

[0087] Table 1

[0088]

[0089]

[0090] From the above results, it can be seen that the bakelite pen feeds prepared in Examples 1 to 3 have better hydrophilicity and writing effect than the bakelite pen feeds prepared in Comparative Examples 1 to 6.

[0091] The main difference between Comparative Example 1 and Example 1 is that the polymer filter belt made of the hydrophilic polymer filter membrane in Comparative Example 1 is not wound, and the surface hydrophilic effect is poor, resulting in a long ink discharge time and ink breakage during the writing process;

[0092] The main difference between Comparative Example 2 and Example 1 is that the high-precision hydrophilic polymer filter membrane used in Comparative Example 2 is too high in precision, resulting in surface pits that are too small, and the droplets cannot spread immediately under the action of surface tension.

[0093] The main difference between Comparative Example 3 and Example 1 is that the brush tip blank in Comparative Example 3 was not densified during preparation. This is likely due to uneven mixing of the brush tip blank in Comparative Example 3, resulting in an uneven density distribution within the brush tip blank. This, in turn, causes fluctuations in the brush tip stress distribution during writing, leading to occasional ink breakage. The densification process primarily improves the mechanical properties of the brush tip blank. The process in Comparative Example 3 is prone to breakage during preparation, particularly during the extrusion molding process. The extrusion process requires extruding a rubber stick, which is then further processed into the desired shape. This uneven density distribution can lead to breakage, resulting in a decrease in product yield.

[0094] The main difference between Comparative Example 4 and Example 1 is that the polymer filter belt made by winding the hydrophilic polymer filter membrane in Comparative Example 4 is too thick. Under the temperature conditions of step (4) of this solution, the micropores fail to merge into pores in time and overflow, and there are more microporous channels inside, resulting in ink leakage;

[0095] The main difference between Comparative Example 5 and Example 1 is that in step (4) of Comparative Example 5, the semi-finished product is heated to 240° C. and kept warm for 3 minutes, which is not performed under a vacuum environment, which also leads to ink leakage due to insufficient micropore merging.

[0096] The main difference between Comparative Example 6 and Example 1 is that Comparative Example 6 is wrapped with a hydrophobic PE film, which is not a filter membrane and has no microporous structure, so the ink cannot be fully spread.

[0097] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein.

Claims

1. A method for preparing a bakelite pen tongue, characterized in that: The following steps are involved: Step (1), mixing: after uniformly blending 10 to 15 parts of a matrix material, 0.3 to 1 part of cellulose and 1 to 8 parts of butadiene rubber by weight, add 1.5 to 2 parts of a vulcanizing agent, 1 to 3 parts of a recycled powder, 1 to 1.5 parts of an oil agent and 2 to 4 parts of a filler, stir uniformly, and knead under anaerobic conditions to obtain kneaded particles; In step (1), the process of banburying under anaerobic conditions is as follows: the uniformly stirred materials are put into a banbury mixer, and banburying is carried out at 80°C to 100°C for 20 to 40 minutes under vacuum or nitrogen atmosphere protection to obtain banburying particles; Step (2), preparing a nib blank: putting the mixed granules into a molding device, molding, and obtaining a nib blank; polishing the nib blank, and cleaning the surface to obtain a nib blank; Step (3) preparing a semi-finished product: immersing a hydrophilic polymer filter membrane into a filler suspension, taking it out after being fully soaked, dehydrating it, and then cutting it into a strip-shaped polymer filter belt; immersing the polymer filter belt in an alcohol solution of a plasticizer for 1s to 5s, taking it out and dealcoholizing it, and then winding it around a pen tongue blank to obtain a semi-finished product; in the semi-finished product, the winding thickness of the polymer filter belt is 1mm to 2mm; the filtration accuracy of the hydrophilic polymer filter membrane is 50μm to 100μm; In the alcohol solution of the plasticizer, the plasticizer is one of aliphatic dibasic acid ester plasticizer, fatty acid ester plasticizer, and benzene polyester plasticizer, and the alcohol is ethanol; the mass proportion of the plasticizer in the alcohol solution of the plasticizer is 5% to 10%; Under the condition of 0.01MPa~0.05MPa, stand for 3min~5min for dealcoholization; Step (4), preparing the bakelite pen tongue: placing the semi-finished product under vacuum conditions and heating it to 100°C~250°C, keeping it warm for 3min~5min, cooling it and then shaping it to obtain the bakelite pen tongue.

2. The method for preparing a bakelite pen tongue according to claim 1, wherein: In step (1), the matrix material is raw rubber; the oil agent is one of engine oil, soybean oil or paraffin oil; the recycled powder is bakelite recycled powder; the filler is one or more of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder and magnesium oxide powder; and the vulcanizing agent is one or more of sulfur, TMTD, benzoyl peroxide, quinone oxime compound, polysulfide polymer, ethyl carbamate and maleimide derivative.

3. The method for preparing the bakelite pen tongue according to claim 1, wherein: In step (2), the molding equipment is an extruder or an injection molding machine; and the molding process is extrusion molding or injection molding.

4. The method for preparing a bakelite pen tongue according to claim 1, wherein: In step (2), the surface roughness Ra of the brush tongue blank after surface grinding is 1.6 μm~6.3 μm.

5. The method for preparing the bakelite pen tongue according to claim 1, wherein: In step (3), the suspended particles in the filler suspension are one or more of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder; and the mass proportion of the suspended particles is 5% to 10%.

6. The method for preparing the bakelite pen tongue according to claim 1, wherein: In step (3), the hydrophilic polymer filter membrane is one of a polyethersulfone filter membrane, a polycarbonate filter membrane, and a cellulose ester filter membrane.

7. A bakelite pen feed prepared by the method for preparing a bakelite pen feed according to any one of claims 1 to 6.

8. A fountain pen having a bakelite feed prepared by the method for preparing a bakelite feed according to any one of claims 1 to 6.

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