Bakelite pen tongue, preparation method thereof and pen with bakelite pen tongue

Abstract

The invention belongs to the technical field of high polymer materials, and discloses a bakelite pen tongue, a preparation method of the bakelite pen tongue and a pen with the bakelite pen tongue. (2) preparing a pen tongue green body; (3) cutting a hydrophilic high-molecular filter membrane into a strip-shaped high-molecular filter strip, and winding the strip-shaped high-molecular filter strip on the pen tongue blank body to obtain a semi-finished product; and (4) the semi-finished product is placed under the vacuum condition to be heated to 100-250 DEG C, heat preservation is conducted for 3-5 min, and the bakelite pen tongue is obtained after cooling and shaping. According to the scheme, a complicated surface hydrophilic modification process is omitted, the process flow is simple and easy to realize, and meanwhile, the prepared product has the characteristics of stable quality, low equipment requirement and environment-friendly process method and material selection.

Description

Technical Field

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

[0002] Most fountain pen inks are water-based inks. The main components of bakelite nibs include matrix materials, butadiene rubber, etc., which have poor hydrophilicity, resulting in poor ink flow and easy adhesion on the surface of the nib, resulting in ink breakage, which in turn affects writing. In the prior art, CN104292486B discloses a nib wetting treatment solution and a method for using the nib, wherein the nib wetting treatment solution comprises an organic surfactant and a moisturizer, wherein the amount of the organic surfactant is 0.1 to 50 g / l, and the amount of the moisturizer is 0.1 to 100 g / l; after the roughened nib is soaked in the nib wetting treatment solution for a certain period of time, it is taken out, spun dry, and dried at 40 to 60°C. The invention soaks the roughened pen tongue in a wetting treatment solution containing a surfactant and a moisturizing agent, so that the surface of the pen tongue adsorbs the surfactant and the moisturizing agent, thereby achieving the purpose of modifying the plastic surface to wet and release ink quickly; CN106827486A discloses a method for improving the surface wettability of a fountain pen tongue by air plasma and its use, and uses plasma discharge to modify the surface wettability of the fountain pen tongue under a certain vacuum degree. The present invention uses air plasma to treat the pen tongue, so that the pen tongue has good wettability, achieves the effect of fast water release and no ink loss, and the surface of the pen tongue treated with air plasma is more beautiful than that treated with sulfuric acid-chromic acid solution. Both methods improve the hydrophilicity of the pen tongue through surface treatment, and will gradually become ineffective with the use 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 obtained product has the characteristics of stable quality.

[0004] To achieve the above object, the technical solution of the present invention is: This scheme proposes a method for preparing a bakelite pen tongue, comprising the following steps: Step (1), mixing: by weight, 10 to 15 parts of a matrix material, 0.3 to 1 part of cellulose and 1 to 8 parts of butadiene rubber are uniformly blended, and then 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 are added, stirred evenly, and kneaded under anaerobic conditions to obtain kneaded particles; Step (2), preparing a nib blank: putting the kneaded particles into a molding device, molding them, obtaining a nib blank, polishing the surface of the nib blank, and cleaning it 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 infiltrated, dehydrating it, and 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 winding it on a pen tongue blank after dealcoholization 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; Step (4), preparing a bakelite pen feed: heating the semi-finished product to 100°C to 250°C under vacuum conditions, keeping the temperature for 3min to 5min, and then cooling and shaping the semi-finished product to obtain a bakelite pen feed.

[0005] The method for preparing the bakelite pen tongue in this scheme has the following characteristics: 1. The surface hydrophilic effect is obtained by winding a hydrophilic polymer filter tape made 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 tape can obtain excellent hydrophilicity when wound on the bakelite pen tongue, but 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, causing ink leakage. Taking this into account, 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 tape 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 tape. The plasticizer can reduce the melting point of the polymer filter tape, so that the polymer filter tape can basically melt under the vacuum conditions of 100℃~250℃ in step (4) to prepare the bakelite pen tongue. 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, and the winding thickness should not be too large. More importantly, in step (4), the semi-finished product is kept at 100°C~250°C under vacuum conditions for 3min~5min. If the thickness is too large, the temperature distribution in the semi-finished product is difficult to control, which may easily lead to a decrease in the shear strength of the polymer filter belt and the pen tongue blank.

[0006] 2. Strengthen the surface. The hydrophilic polymer filter membrane has good toughness, but its strength is relatively low. In this scheme, 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, and at the same time, it can also ensure that when heating and remolding under vacuum conditions in step (4), the polymer filter belt can be more closely combined with the pen tongue blank; furthermore, the hydrophilic polymer filter membrane is immersed in the filler suspension, and 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.

[0007] 3. Obtain better uniformity and strength through banburying. Most of the existing technologies directly extrude or injection mold the materials after mixing to make the pen tongue. This solution adds a banburying process, in which the materials are initially mixed and granulated at high temperature, and then enter the extruder or injection molding machine for further processing. This can make the material mixing more uniform, and at the same time, the vulcanization reaction of the rubber can be initially carried out, and further reaction can be carried out in the subsequent processing process, so that part of the materials in each component are integrated into the vulcanization network, and the strength and toughness of the pen tongue blank are enhanced.

[0008] 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 formate, and maleimide derivative.

[0009] In this scheme, the pen tongue blank is made from the above materials, and needs to be further wrapped with a polymer filter belt. The strength of the pen tongue blank is the main concern, so a large amount of vulcanizer is added. The oil agent is used as a plasticizer, and the filler is used as a reinforcing agent.

[0010] Preferably, in step (1), the process of internal mixing under anaerobic conditions is: putting the uniformly stirred materials into an internal mixer, and internal mixing for 20 min to 40 min at 80° C. to 100° C. under vacuum or nitrogen atmosphere protection to obtain internal mixing particles.

[0011] The main purpose of internal mixing is to fully mix the materials and initially vulcanize the raw rubber, while also improving the production efficiency of subsequent processes.

[0012] 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.

[0013] Preferably, in step (2), the surface roughness Ra of the brush tongue blank after surface grinding is 1.6 μm to 6.3 μm.

[0014] 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%.

[0015] The liquid phase of the filler suspension is water, and the hydrophilic polymer filtration membrane is immersed in the filler suspension. After being fully infiltrated, it needs to be dehydrated when taken out.

[0016] 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.

[0017] In this scheme, the filtration accuracy of the hydrophilic polymer filtration membrane should not be too high, that is, it should not be less than 50μm. In this scheme, the micropores of the hydrophilic polymer filtration membrane are used to manufacture surface pits for storing ink. If the accuracy is too high, that is, the smaller the pore size of the micropores, the bubbles gradually merged into the micropores in the film in step (4) are too small, and the pit size formed after overflow is too small, and the hydrophilic effect is poor.

[0018] 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%.

[0019] 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.

[0020] Leaving the alcohol in the air to evaporate is also a feasible solution, but the efficiency is lower.

[0021] This solution also proposes a bakelite pen feed prepared by the bakelite pen feed preparation method.

[0022] This solution also proposes a fountain pen with a bakelite feed prepared by the bakelite feed preparation method.

[0023] Compared with the prior art, the present invention has the following advantages: 1. This scheme obtains a surface hydrophilic effect by winding a hydrophilic polymer filter belt made of a hydrophilic polymer filter membrane on the surface of a conventional bakelite pen tongue, and further utilizes the thermoplastic characteristics of the hydrophilic polymer filter membrane raw material to firmly attach it to the pen tongue blank by heating, so that the pen tongue obtains a very good hydrophilic effect. At the same time, the micropores of the hydrophilic polymer filter membrane are further utilized, which overflow to the surface during the heating and remolding process to form a pit structure, which is conducive to storing ink.

[0024] 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 the characteristics of stable quality, low equipment requirements, and environmentally friendly process methods and material selection. DETAILED DESCRIPTION

[0025] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1 A method for preparing a bakelite pen tongue comprises the following steps: Step (1), mixing: by weight, 10 parts of raw rubber, 0.3 parts of cellulose and 3 parts of butadiene rubber are uniformly blended, and then 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 are added, and the mixture is uniformly stirred, and the mixture is put into an internal mixer, and is internally kneaded for 20 minutes at 90° C. under the protection of a nitrogen atmosphere to obtain internally kneaded particles; Step (2), preparing a pen tongue blank: putting the kneaded granules into an extrusion molding device, extruding and molding, obtaining a pen tongue blank, polishing the surface of the pen tongue blank, and washing the surface to obtain a pen tongue blank with a surface roughness Ra of 2.3 μm; Step (3), preparing a semi-finished product: immersing a polyethersulfone filter membrane with a filtration accuracy of 50 μm into a filler suspension containing 8% by weight of suspended particles, wherein the suspended particles are a mixture of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder in equal proportions; the liquid phase in the filler suspension is water, and after being fully infiltrated, 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; Step (4), preparing a bakelite pen feed: heating the semi-finished product to 240° C. under vacuum conditions, keeping the temperature for 3 minutes, and then cooling and shaping the semi-finished product to obtain a bakelite pen feed.

[0027] Embodiment 2 A method for preparing a bakelite pen tongue comprises the following steps: Step (1), mixing: by weight, 15 parts of raw rubber, 0.8 parts of cellulose and 6 parts of butadiene rubber are uniformly 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, and the mixture is uniformly stirred, and the mixture is put into an internal mixer, and is internally kneaded for 30 minutes at 80° C. under vacuum to obtain internally kneaded particles; Step (2), preparing a pen tongue blank: putting the kneaded granules into an injection molding device, injection molding, obtaining a pen tongue blank, polishing the pen tongue blank, and cleaning the pen tongue blank to obtain a pen tongue blank with a surface roughness Ra of 5.2 μm; 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 carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder in equal proportions; the liquid phase in the filler suspension is water, and after being fully infiltrated, 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 8% by mass of an aliphatic dibasic acid ester plasticizer for 5 seconds, taken out, left to stand for 4 minutes under 0.05 MPa conditions 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; Step (4), preparing a bakelite pen feed: heating the semi-finished product to 220° C. under vacuum conditions, keeping the temperature for 5 minutes, cooling it, and then trimming it to obtain a bakelite pen feed.

[0028] Embodiment 3 A method for preparing a bakelite pen tongue comprises the following steps: Step (1), mixing: by weight, 12 parts of raw rubber, 0.8 parts of cellulose and 6 parts of butadiene rubber are uniformly blended, and then 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 are added, and the mixture is uniformly stirred, and the mixture is put into an internal mixer, and is internally kneaded for 40 minutes at 90° C. under vacuum to obtain internally kneaded particles; Step (2), preparing a nib blank: putting the kneaded granules into an injection molding device, 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; 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 suspended particles of 10% by mass, wherein the suspended particles are a mixture of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder in equal proportions; the liquid phase in the filler suspension is water, and after being fully infiltrated, 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 of 5% by mass 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; Step (4), preparing a bakelite pen feed: heating the semi-finished product to 200° C. under vacuum conditions, keeping the temperature for 3 minutes, and then cooling and shaping the semi-finished product to obtain a bakelite pen feed.

[0029] Comparative Example 1 A method for preparing a bakelite pen tongue is prepared by the following steps: 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 trimmed and cleaned to obtain a bakelite pen tongue.

[0030] Comparative Example 2 A method for preparing a bakelite pen tongue comprises the following steps: Step (1), mixing: by weight, 10 parts of raw rubber, 0.3 parts of cellulose and 3 parts of butadiene rubber are uniformly blended, and then 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 are added, and the mixture is uniformly stirred, and the mixture is put into an internal mixer, and is internally kneaded for 20 minutes at 90° C. under the protection of a nitrogen atmosphere to obtain internally kneaded particles; Step (2), preparing a pen tongue blank: putting the kneaded granules into an extrusion molding device, extruding and molding, obtaining a pen tongue blank, polishing the surface of the pen tongue blank, and washing the surface to obtain a pen tongue blank with a surface roughness Ra of 2.3 μm; Step (3), preparing a semi-finished product: immersing a polyethersulfone filter membrane with a filtration accuracy of 10 μm into a filler suspension containing 8% by mass of suspended particles, wherein the suspended particles are a mixture of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder in equal proportions; the liquid phase in the filler suspension is water, and after being fully infiltrated, 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; Step (4), preparing a bakelite pen feed: heating the semi-finished product to 240° C. under vacuum conditions, keeping the temperature for 3 minutes, and then cooling and shaping the semi-finished product to obtain a bakelite pen feed.

[0031] Comparative Example 3 A method for preparing a bakelite pen tongue comprises the following steps: Step (1), mixing: by weight, 10 parts of raw rubber, 0.3 parts of cellulose and 3 parts of butadiene rubber are uniformly blended, and then 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 are added, and the mixture is uniformly stirred, and then put into an extrusion molding equipment, and extruded to obtain a pen tongue blank, and the pen tongue blank is surface-polished and cleaned to obtain a pen tongue blank with a surface roughness Ra of 2.3 μm; Step (2), preparing a semi-finished product: immersing a polyethersulfone filter membrane with a filtration accuracy of 50 μm into a filler suspension in which the mass proportion of suspended particles is 8%, and the suspended particles are a mixture of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder in equal proportions; the liquid phase in the filler suspension is water, and after being fully infiltrated, 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. After standstill for 5 minutes, dealcoholization is carried out and then wound on a pen tongue blank to obtain a semi-finished polymer filter belt with a winding thickness of 1 mm; Step (3), preparing a bakelite pen feed: heating the semi-finished product to 240° C. under vacuum conditions, keeping the temperature for 3 minutes, cooling it, and then reshaping it to obtain a bakelite pen feed.

[0032] Comparative Example 4 A method for preparing a bakelite pen tongue comprises the following steps: Step (1), mixing: by weight, 10 parts of raw rubber, 0.3 parts of cellulose and 3 parts of butadiene rubber are uniformly blended, and then 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 are added, and the mixture is uniformly stirred, and the mixture is put into an internal mixer, and is internally kneaded for 20 minutes at 90° C. under the protection of a nitrogen atmosphere to obtain internally kneaded particles; Step (2), preparing a pen tongue blank: putting the kneaded granules into an extrusion molding device, extruding and molding, obtaining a pen tongue blank, polishing the surface of the pen tongue blank, and washing the surface to obtain a pen tongue blank with a surface roughness Ra of 2.3 μm; Step (3), preparing a semi-finished product: immersing a polyethersulfone filter membrane with a filtration accuracy of 50 μm into a filler suspension containing 8% by weight of suspended particles, wherein the suspended particles are a mixture of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder in equal proportions; the liquid phase in the filler suspension is water, and after being fully infiltrated, 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 5 mm; Step (4), preparing a bakelite pen feed: heating the semi-finished product to 240° C. under vacuum conditions, keeping the temperature for 3 minutes, and then cooling and shaping the semi-finished product to obtain a bakelite pen feed.

[0033] Comparative Example 5 A method for preparing a bakelite pen tongue comprises the following steps: Step (1), mixing: by weight, 10 parts of raw rubber, 0.3 parts of cellulose and 3 parts of butadiene rubber are uniformly blended, and then 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 are added, and the mixture is uniformly stirred, and the mixture is put into an internal mixer, and is internally kneaded for 20 minutes at 90° C. under the protection of a nitrogen atmosphere to obtain internally kneaded particles; Step (2), preparing a pen tongue blank: putting the kneaded granules into an extrusion molding device, extruding and molding, obtaining a pen tongue blank, polishing the surface of the pen tongue blank, and washing the surface to obtain a pen tongue blank with a surface roughness Ra of 2.3 μm; Step (3), preparing a semi-finished product: immersing a polyethersulfone filter membrane with a filtration accuracy of 50 μm into a filler suspension containing 8% by weight of suspended particles, wherein the suspended particles are a mixture of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder in equal proportions; the liquid phase in the filler suspension is water, and after being fully infiltrated, 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; Step (4), preparing a bakelite pen feed: heating the semi-finished product to 240° C., keeping the temperature for 3 minutes, cooling it, and then trimming the shape to obtain a bakelite pen feed.

[0034] Comparative Example 6 A method for preparing a bakelite pen tongue comprises the following steps: Step (1), mixing: by weight, 10 parts of raw rubber, 0.3 parts of cellulose and 3 parts of butadiene rubber are uniformly blended, and then 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 are added, and the mixture is uniformly stirred, and the mixture is put into an internal mixer, and is internally kneaded for 20 minutes at 90° C. under the protection of a nitrogen atmosphere to obtain internally kneaded particles; Step (2), preparing a pen tongue blank: putting the kneaded granules into an extrusion molding device, extruding and molding, obtaining a pen tongue blank, polishing the surface of the pen tongue blank, and washing the surface to obtain a pen tongue blank with a surface roughness Ra of 2.3 μm; Step (3), preparing a semi-finished product: immersing the PE film in a filler suspension containing 8% by weight of suspended particles, wherein the suspended particles are a mixture of carbon black powder, white carbon black powder, calcium carbonate powder, titanium dioxide powder, aluminum oxide powder, and magnesium oxide powder in equal proportions; the liquid phase in the filler suspension is water, and after being fully infiltrated, the film 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 0.03MPa 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 5mm; Step (4), preparing a bakelite pen feed: heating the semi-finished product to 240° C. under vacuum conditions, keeping the temperature for 3 minutes, and then cooling and shaping the semi-finished product to obtain a bakelite pen feed.

[0035] Performance testing: 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.

[0036] 2. Writing test: The bakelite pen tongues prepared in the above examples 1 to 3 and comparative examples 1 to 6 were made into fountain pens, and the writing effect was tested, including the ink release time of the first writing and the ink release effect during the 30-minute writing process.

[0037] The test results are shown in Table 1.

[0038] Table 1 It can be seen from the above results that the bakelite pen tongues prepared in Examples 1 to 3 have better hydrophilicity and writing effect than the bakelite pen tongues prepared in Comparative Examples 1 to 6.

[0039] The main difference between Comparative Example 1 and Example 1 is that the polymer filter belt made of the hydrophilic polymer filter membrane is not wound in Comparative Example 1, and the surface hydrophilic effect is poor, resulting in a long ink release time and ink breakage during the writing process; The main difference between Comparative Example 2 and Example 1 is that the high-precision hydrophilic polymer filter membrane used in Comparative Example 2 has too high a precision, resulting in surface pits that are too small, and cannot be spread immediately under the action of the surface tension of the droplets.

[0040] The main difference between Comparative Example 3 and Example 1 is that the tongue blank of Comparative Example 3 is not densified during the preparation process. This may be due to the uneven mixing of the tongue blank of Comparative Example 3, which leads to uneven density distribution of the tongue blank, and then causes fluctuations in the stress distribution of the tongue during writing, resulting in occasional ink breakage. The densification process improves the mechanical properties of the tongue blank more. The process of Comparative Example 3 is prone to breakage during the preparation process, especially during the extrusion molding process. The extrusion process requires the rubber stick to be extruded first, and then further processed into the required shape. During this process, the uneven density distribution of the rubber stick will cause breakage, resulting in a decrease in the yield rate.

[0041] 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 many micropore channels inside, resulting in ink leakage. 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, but is not performed under a vacuum environment, which also leads to ink leakage due to insufficient micropore merging.

[0042] The main difference between Comparative Example 6 and Example 1 is that Comparative Example 6 is wrapped with a hydrophobic PE film, and is not a filter membrane and has no microporous structure, so the ink cannot be fully spread.

[0043] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. The present 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 technical means in the art that are not disclosed in the present disclosure.

Claims

1. A method for preparing a bakelite pen tongue, characterized in that: The following steps are involved: Step (1), mixing: by weight, 10 to 15 parts of a matrix material, 0.3 to 1 part of cellulose and 1 to 8 parts of butadiene rubber are uniformly blended, and then 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 are added, stirred evenly, and kneaded under anaerobic conditions to obtain kneaded particles; Step (2), preparing a nib blank: putting the kneaded particles into a molding device, molding them, obtaining a nib blank, polishing the surface of the nib blank, and cleaning it 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 infiltrated, dehydrating it, and 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 winding it on a pen tongue blank after dealcoholization 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; Step (4), preparing a bakelite pen feed: heating the semi-finished product to 100°C to 250°C under vacuum conditions, keeping the temperature for 3min to 5min, and then cooling and shaping the semi-finished product to obtain a bakelite pen feed.

2. The method for preparing the bakelite pen tongue according to claim 1, characterized in that: 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 formate, and maleimide derivative.

3. The method for preparing the bakelite pen tongue according to claim 1, characterized in that: In step (1), the process of internal mixing under anaerobic conditions is as follows: the uniformly stirred materials are put into an internal mixer, and internal mixing is performed at 80°C to 100°C for 20 minutes to 40 minutes under vacuum or nitrogen atmosphere protection to obtain internal mixing particles.

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

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

6. The method for preparing the bakelite pen tongue according to claim 1, characterized in that: 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%.

7. The method for preparing the bakelite pen tongue according to claim 1, characterized in that: 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; in the alcohol solution of the plasticizer, the plasticizer is one of an aliphatic dibasic acid ester plasticizer, a fatty acid ester plasticizer, and a 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%.

8. The method for preparing the bakelite pen tongue according to claim 1, characterized in that: 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.

9. A bakelite pen feed prepared by the method for preparing a bakelite pen feed as claimed in any one of claims 1 to 8.

10. A fountain pen having a bakelite feed prepared by the method for preparing a bakelite feed as claimed in any one of claims 1 to 8.

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