CN111171572A

CN111171572A - Passive capacitive pen nib, passive capacitive pen and nib manufacturing method

Info

Publication number: CN111171572A
Application number: CN202010061088.3A
Authority: CN
Inventors: 万虎; 冯先强
Original assignee: Guangzhou Shiyuan Electronics Thecnology Co Ltd
Current assignee: Guangzhou Shiyuan Electronics Thecnology Co Ltd
Priority date: 2020-01-19
Filing date: 2020-01-19
Publication date: 2020-05-19

Abstract

The invention belongs to the technical field of touch control, and provides a passive capacitive pen nib, a passive capacitive pen and a nib preparation method thereof. Passive electric capacity pen nib, including nib skin and nib bulk layer, the outer cladding of nib is fixed in the surface of nib bulk layer, the nib skin includes the raw materials of following parts by weight: 100-150 parts of a first nib base material, 2-15 parts of a first conductive filler, 3-20 parts of a wear-resistant auxiliary agent, 0.1-8 parts of a plasticizer, 0.2-3 parts of a first coupling agent, 0.1-5 parts of a first dispersing agent, 0-6 parts of a first vulcanizing agent and 0-10 parts of a coloring agent; the pen point main body layer comprises the following raw materials in parts by weight: 300-500 parts of second pen point base material, 5-25 parts of second conductive filler, 0.2-3 parts of second coupling agent, 0.1-5 parts of second dispersing agent and 0-6 parts of second vulcanizing agent. The pen point of the passive capacitance pen has the advantages of high writing smoothness, good wear resistance, small screen impact sound, no damage to a screen, good conductivity and high mechanical strength, and excellent writing experience is obtained after the passive capacitance pen is assembled into the capacitance pen.

Description

Passive capacitive pen nib, passive capacitive pen and nib manufacturing method

Technical Field

The invention belongs to the technical field of touch control, and particularly relates to a passive capacitive pen nib, a passive capacitive pen and a nib preparation method.

Background

With the popularization of touch screens in life and work of people, touch pens with the advantages of high touch precision, rich expanded functions, accordance with the use habits of consumers and the like have gradually become one of mainstream human-computer interaction modes. In order to achieve the best writing effect and use experience, the nib material needs to be optimally modified and the processing and forming process needs to be adjusted.

The principle of the passive capacitive pen is to simulate the touch effect of fingers, a pen point is made of a conductive material and can cause capacitance change of a touch screen matrix when being in contact with a touch screen, and pen point materials of the passive capacitive pen popular in the market at present comprise conductive foam, metal, conductive fibers, conductive silica gel or conductive cloth and the like. Wherein electrically conductive bubble is cotton, conductive fiber and electrically conductive cloth material all have the problem that wear resistance is not enough to a certain extent, and the nib of metal class is scraped the touch screen easily and is colored and striking the screen when writing sound great, and electrically conductive silica gel can effectively avoid the problem that wear resistance is not enough and damage the screen, and the screen impact sound is little, but is subject to the characteristic of material itself, and electrically conductive silica gel class nib damping is great when writing, writes not smooth enough, uses easy fatigue for a long time.

Aiming at the above problems, the industry has been to improve the conductivity and wear resistance of the pen point by adjusting the formula of the pen point material and adding conductive filler or wear-resistant material. However, the addition of fillers with different components often cracks the continuous phase of the matrix material, and interface defects seriously damage the integrity of the matrix material, so that the mechanical properties such as toughness, impact resistance and the like are reduced, and unrecoverable deformation and damage are easy to occur during drop test.

Therefore, the pen point material with excellent comprehensive performance, good conductivity, high writing smoothness, good wear resistance, small screen impact sound, no damage to the screen and high mechanical strength is developed, and has important significance for improving the writing experience of the passive capacitance pen.

Disclosure of Invention

Based on the above, the embodiment of the invention provides the passive capacitive pen nib which is high in writing smoothness, good in wear resistance, small in screen impact sound, free of damage to a screen, good in conductivity and high in mechanical strength, and obtains excellent writing experience after being assembled into a capacitive pen.

The utility model provides a passive form electric capacity pen nib, includes nib skin and nib bulk layer, the outer cladding of nib is fixed in the surface of nib bulk layer, the nib skin includes the raw materials of following parts by weight:

the pen point main body layer comprises the following raw materials in parts by weight:

according to the passive capacitive pen nib provided by the embodiment of the invention, the multi-stage structural design of the nib outer layer and the nib main body layer is carried out on the passive capacitive pen nib, so that the nib outer layer and the nib main body layer respectively have different attributes, and thus the passive capacitive pen nib has multiple performance advantages, has excellent comprehensive performance, and effectively avoids the performance loss of the passive capacitive pen nib made of materials of the same system in the traditional process and formula; in the formula of the material of the outer layer of the pen point, the pen point has conductive performance by adding the conductive filler, the surface friction coefficient of the base material can be reduced by adding the wear-resistant auxiliary agent, the wear resistance and the writing smoothness of the pen point are improved, and better writing experience is achieved; because nib bulk layer material does not with screen direct contact, its formula is simple relatively with nib outer layer material, under the prerequisite of guaranteeing nib conductivity, has reduced the component as far as possible, makes passive form electric capacity pen nib mechanical strength higher, and structural toughness is better to play stronger supporting role.

Further, the pen point main body layer encloses an assembly groove; the ratio of the thickness of the nib outer layer to the thickness of the nib main body layer is 1:2 to 1: 20. The above is a preferable ratio of the thicknesses of the outer layer and the main body layer of the pen tip, and if the outer layer is too thick, mechanical properties such as toughness and impact resistance are deteriorated, and if the main body layer is too thick, electrical conductivity is deteriorated, and properties such as writing smoothness and screen impact noise are deteriorated.

Preferably, the first nib base material and the second nib base material are the same. The substrate materials of the outer layer and the main body layer of the pen point are the same, so that the compatibility of the outer layer and the main body layer of the pen point can be improved, and the outer layer and the main body layer of the pen point are combined more tightly and firmly.

Further, the first nib base material and the second nib base material are selected from at least one of thermoplastic resin, thermoplastic rubber and silica gel materials. Preferably, the first nib base material and the second nib base material are selected from at least one of polyethylene, polyamide, styrene butadiene rubber, nitrile butadiene rubber, chloroprene rubber and silica gel materials.

Further, the first conductive filler and the second conductive filler are selected from at least one of silver powder, copper powder, nano silver wires, carbon nanotubes, graphene, carbon black or graphite.

Further, the wear-resistant auxiliary agent comprises polytetrafluoroethylene and at least one of glass beads, light calcium carbonate or mica powder. The polytetrafluoroethylene has wear resistance, the glass beads, the light calcium carbonate or the mica powder have certain wear resistance and can play a weight-reducing role, the glass beads are preferably hollow glass beads, the porosity and the pore size of the outer layer material of the pen point and the overall hardness and the weight of the pen point can be adjusted by reasonably matching wear-resistant auxiliaries made of various materials as composite fillers, so that the porosity of the outer layer material of the finally formed pen point is high, the pore size distribution is uniform, the structure can also play a role in reducing the overall weight of the pen point and absorbing sound and shock, and meanwhile, the screen impact sound can be effectively reduced due to proper hardness.

Preferably, the plasticizer is at least one selected from phthalate, phosphate, aliphatic dibasic acid ester, fatty acid ester, benzene polyacid ester, polyol ester, epoxy hydrocarbon, alkyl sulfonate and the like, and the plasticizer is added to reduce the softening temperature range of the composite material and improve the processability, flexibility and ductility of the composite material; the first coupling agent and the second coupling agent are selected from at least one of silane coupling agent, titanate and aluminate coupling agent; the first dispersant and the second dispersant are selected from at least one of vinyl bis-stearamide, fatty acids, fatty amides, triethyl hexyl phosphoric acid and fatty acid polyethylene glycol ester; the first vulcanizing agent and the second vulcanizing agent are at least one selected from elemental sulfur, elemental selenium, elemental tellurium, sulfur-containing compounds and peroxides, quinone compounds, amine compounds, resin compounds, metal oxides and isocyanate. In addition, the coloring agent is preferably carbon powder which has stable performance, heat resistance, chemical resistance, light resistance, low cost and strong coloring power, and the selection of the coloring agent can be adjusted according to the design of the pen point ID.

The embodiment of the invention also provides a passive capacitance pen which comprises the pen point of the passive capacitance pen.

The embodiment of the invention also provides a preparation method of the passive capacitance pen nib, which comprises the following steps:

preparing the nib outer sheet;

preparing the nib body layer sheet;

and carrying out hot press molding on the pen point outer layer material and the pen point main body layer material to form a pen point composite sheet, forming the pen point composite sheet in a mold, and demolding to obtain the passive capacitance pen point.

Furthermore, the preparation method of the passive capacitance pen nib,

the preparation method of the pen point outer layer sheet comprises the following steps:

(1) weighing the raw materials according to the weight parts in the formula of the outer layer of the pen point for later use;

(2) adding a first pen point base material, a plasticizer and a first coupling agent into a mixing roll, mixing for 30-120 minutes at the temperature of 60-150 ℃, then adding a first dispersing agent, a first conductive filler, a wear-resistant auxiliary agent, a coloring agent, a first dispersing agent and a first vulcanizing agent, continuously mixing for 30-120 minutes, vacuumizing to remove bubbles, and standing for 10-90 minutes to obtain a first molten fluid;

(3) forming the molten fluid into a pen point outer layer sheet material through calendering;

the preparation method of the pen point main body layer sheet comprises the following steps:

(1) weighing the raw materials according to the weight parts in the formula of the nib main body layer for later use;

(2) adding a second pen point base material, a second conductive filler, a second coupling agent, a second dispersing agent and a second vulcanizing agent into a mixing mill, mixing at the temperature of 60-150 ℃ for 30-120 minutes, then adding the dispersing agent, the conductive filler, a wear-resistant assistant, a coloring agent and a vulcanizing agent, continuously mixing for 30-120 minutes, vacuumizing to remove bubbles, and standing for 10-90 minutes to obtain a second molten fluid;

(3) forming the second molten fluid into a pen point outer layer sheet through calendering;

the preparation method of the composite sheet material for the pen point comprises the following steps: and (3) overlapping the pen point outer layer sheet and the pen point main body layer sheet, heating to 50-80 ℃, and calendering by a press roller to form the pen point composite sheet.

According to the preparation method of the passive capacitive pen nib, the nib is processed in a solid hot press forming mode, so that the process control is simple, the yield is high, the quality of a finished product is stable, and the method is suitable for industrial production.

Drawings

FIG. 1 is a schematic diagram of a pen tip of the passive capacitive pen according to embodiments 1-5;

FIG. 2 is a schematic structural diagram of a composite material of a pen tip obtained in a process of preparing the pen tip of the passive capacitance pen of examples 6 to 10;

in the figure: 1-nib outer layer, 2-nib main body layer, 3-assembly groove, 4-nib outer layer sheet and 5-nib main body layer sheet.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

The passive capacitance pen nib of the embodiment comprises a nib outer layer 1 and a nib main body layer 2, as shown in fig. 1, wherein the nib outer layer 1 is covered and fixed on the outer surface of the nib main body layer 2, the nib main body layer encloses an assembly groove 3, and the ratio of the thickness of the nib outer layer 1 to the thickness of the nib main body layer 2 is 1: 5.

The outer layer 1 of the pen point comprises the following raw materials in parts by weight: 120 parts of first nib base material silicone rubber, and the first conductive filler is silver powder and copper powder in a weight ratio of 1:1, and the wear-resistant auxiliary agent is polytetrafluoroethylene PTFE, glass beads and light calcium carbonate according to the weight ratio of 1: 1:1, 1.5 parts of silane coupling agent, 3 parts of plasticizer phthalate, 2 parts of first dispersant vinyl bis stearamide, 5 parts of carbon powder and 1 part of vulcanizing agent;

the pen point main body layer comprises the following raw materials in parts by weight: 400 parts of second pen point base material silicon rubber, 10 parts of second conductive filler silver powder, 2 parts of silane coupling agent, 3 parts of second dispersant fatty acid polyglycol ester and 1 part of vulcanizing agent.

Example 2

The passive capacitance pen nib of the embodiment comprises a nib outer layer 1 and a nib main body layer 2, as shown in fig. 1, wherein the nib outer layer 1 is covered and fixed on the outer surface of the nib main body layer 2, the nib main body layer encloses an assembly groove 3, and the ratio of the thickness of the nib outer layer 1 to the thickness of the nib main body layer 2 is 1: 10.

The outer layer 1 of the pen point comprises the following raw materials in parts by weight: 130 parts of nitrile rubber serving as a first nib base material, and a first conductive filler which is silver powder and carbon nano tubes in a weight ratio of 20: 1, and the wear-resistant auxiliary agent is tetrafluoroethylene (PTFE) and glass beads in a weight ratio of 1:1 part to 20 parts, titanate coupling agent 2 parts, plasticizer aliphatic dibasic acid ester 5 parts, first dispersant triethyl hexyl phosphoric acid 4 parts, carbon powder 6 parts and vulcanizing agent 2 parts;

the pen point main body layer 2 comprises the following raw materials in parts by weight: 450 parts of nitrile rubber serving as a base material of the second pen point, 12 parts of silver powder serving as a second conductive filler, 2 parts of titanate coupling agent, 4 parts of fatty acid polyglycol ester serving as a second dispersing agent and 2 parts of vulcanizing agent.

Example 3

The passive capacitance pen nib of the embodiment comprises a nib outer layer 1 and a nib main body layer 2, as shown in fig. 1, wherein the nib outer layer 1 is covered and fixed on the outer surface of the nib main body layer 2, the nib main body layer encloses an assembly groove 3, and the ratio of the thickness of the nib outer layer 1 to the thickness of the nib main body layer 2 is 1: 8.

The outer layer 1 of the pen point comprises the following raw materials in parts by weight: 110 parts of first nib base material silicon rubber, and the first conductive filler is silver powder, copper powder and carbon nano tubes in a weight ratio of 20: 20: 1, and the wear-resistant auxiliary agent is tetrafluoroethylene (PTFE) and light calcium carbonate according to the weight ratio of 1:1 to 16 parts, 3 parts of plasticizer phthalate, 2.5 parts of silane coupling agent, 2.5 parts of first dispersant fatty acid polyglycol ester, 7 parts of carbon powder and 3 parts of vulcanizing agent;

the pen point main body layer 2 comprises the following raw materials in parts by weight: 480 parts of nitrile rubber serving as a base material of the second pen point, 15 parts of silver powder serving as a second conductive filler, 2.5 parts of titanate coupling agent, 3.5 parts of fatty acid polyglycol ester serving as a second dispersing agent and 3 parts of vulcanizing agent.

Example 4

The passive capacitance pen nib of the embodiment comprises a nib outer layer 1 and a nib main body layer 2, as shown in fig. 1, wherein the nib outer layer 1 is fixed on the outer surface of the nib main body layer 2 in a covering manner, an assembly groove 3 is defined by the nib main body layer, and the ratio of the thickness of the nib outer layer 1 to the thickness of the nib main body layer 2 is 1: 2.

The outer layer 1 of the pen point comprises the following raw materials in parts by weight: 100 parts of styrene butadiene rubber as a first pen point base material, silver powder as a conductive filler, copper powder and a carbon nano tube in a weight ratio of 10: 10: 1, and the wear-resistant auxiliary agent is tetrafluoroethylene (PTFE) and light calcium carbonate in a weight ratio of 1:1 to 3 parts, 8 parts of plasticizer phthalate, 3 parts of silane coupling agent and 5 parts of first dispersant fatty acid polyglycol ester;

the pen point main body layer 2 comprises the following raw materials in parts by weight: 500 parts of styrene butadiene rubber as a base material of the second pen point, 3 parts of copper powder as a second conductive filler, 0.2 part of titanate coupling agent, 0.1 part of vinyl bis stearamide as a second dispersing agent and 6 parts of vulcanizing agent.

Example 5

The passive capacitance pen nib of the embodiment comprises a nib outer layer 1 and a nib main body layer 2, as shown in fig. 1, wherein the nib outer layer 1 is covered and fixed on the outer surface of the nib main body layer 2, the nib main body layer encloses an assembly groove 3, and the ratio of the thickness of the nib outer layer 1 to the thickness of the nib main body layer 2 is 1: 20.

The outer layer 1 of the pen point comprises the following raw materials in parts by weight: 150 parts of first pen point base material chloroprene rubber, and the first conductive filler is copper powder, carbon nano tubes and graphene according to a weight ratio of 5: 5: 1, and the wear-resistant auxiliary agent is tetrafluoroethylene (PTFE), hollow glass microspheres and mica powder in a weight ratio of 1: 1:1 to 20 parts, 0.1 part of plasticizer phthalate, 0.2 part of silane coupling agent, 0.1 part of first dispersant fatty acid polyglycol ester, 10 parts of carbon powder and 6 parts of vulcanizing agent;

the pen point main body layer 2 comprises the following raw materials in parts by weight: 300 parts of second nib base material chloroprene rubber, 25 parts of second conductive filler carbon nano tubes, 3 parts of titanate coupling agent and 5 parts of second dispersant fatty acid polyethylene glycol ester.

Example 6

The passive capacitive pen nib of example 1 was prepared as follows:

(1) weighing 120 parts of first nib base material silicone rubber and a first conductive filler comprising silver powder and copper powder according to the weight ratio of 1:1, and the wear-resistant auxiliary agent is tetrafluoroethylene (PTFE), glass beads and light calcium carbonate according to the weight ratio of 1: 1:1 to 18 parts, 3 parts of plasticizer phthalate, 1.5 parts of silane coupling agent, 2 parts of first dispersant vinyl bis stearamide, 5 parts of carbon powder and 1 part of vulcanizing agent for later use;

(2) adding a first pen point base material, a plasticizer and a silane coupling agent into a clean mixing mill, mixing for 60 minutes at the temperature of 100 ℃, then adding a first dispersing agent, a first conductive filler, a wear-resistant auxiliary agent, a coloring agent and a vulcanizing agent, continuously mixing for 90 minutes, vacuumizing to remove bubbles, and standing for 30 minutes to obtain a uniformly mixed first molten fluid;

(3) and (3) preparing the molten fluid I obtained in the step (2) into a sheet with a certain thickness and a certain using area through rolling and forming, namely the outer layer sheet of the pen point.

(4) Weighing 400 parts of second pen point base material silicon rubber, 10 parts of second conductive filler silver powder, 2 parts of silane coupling agent, 3 parts of second dispersant fatty acid polyglycol ester and 1 part of vulcanizing agent according to the parts by weight in the formula of the pen point main body layer, adding into a mixing roll, mixing for 90 minutes at the temperature of 100 ℃, vacuumizing to remove bubbles, and standing for 30 minutes to obtain uniformly mixed molten fluid II;

(5) and (4) carrying out extension pressing on the second molten fluid in the step (4) to prepare a sheet with a certain thickness and a certain use area, namely the pen point main body layer sheet.

(6) Superposing the pen point outer layer sheet and the pen point main body layer sheet, heating to 60 ℃, then rolling and pressing the materials into a composite sheet with the required thickness through a pressing roller, and cooling to room temperature to obtain the pen point composite sheet, wherein the pen point composite sheet comprises a pen point outer layer sheet 4 and a pen point main body layer sheet 5 as shown in figure 2;

(7) putting the nib composite sheet into a nib mould of a hot press for heating, exhausting, maintaining pressure and forming;

(8) and cooling, demolding and finishing to obtain the passive capacitance pen point.

Example 7

The passive capacitive pen nib of example 2 was prepared as follows:

(1) weighing 130 parts of nitrile rubber as a first nib base material, silver powder as a first conductive filler and a carbon nano tube according to the weight part in the nib outer layer formula, wherein the weight ratio of the nitrile rubber to the silver powder to the carbon nano tube is 20: 1, and the wear-resistant auxiliary agent is tetrafluoroethylene (PTFE) and glass beads in a weight ratio of 1:1 to 20 parts, 5 parts of plasticizer aliphatic dibasic acid ester, 2 parts of titanate coupling agent, 4 parts of first dispersant triethylhexyl phosphoric acid, 6 parts of carbon powder and 2 parts of vulcanizing agent for later use;

(2) adding a first pen point base material, a plasticizer and a titanate coupling agent into a clean mixing mill, mixing for 60 minutes at the temperature of 90 ℃, then adding a first dispersing agent, a first conductive filler, a wear-resistant auxiliary agent, a coloring agent and a vulcanizing agent, continuously mixing for 90 minutes, vacuumizing to remove bubbles, and standing for 30 minutes to obtain a uniformly mixed first molten fluid;

(3) the first molten fluid in the step (2) is subjected to rolling forming to prepare a sheet with a certain thickness and a certain use area, namely the outer layer sheet of the pen point;

(4) weighing 450 parts of nitrile rubber as a second nib base material, 12 parts of silver powder as a second conductive filler, 2 parts of titanate coupling agent, 4 parts of second dispersant fatty acid polyglycol ester and 2 parts of vulcanizing agent according to the parts by weight in the nib main body layer formula, adding into a mixing roll, mixing at 90 ℃ for 90 minutes, vacuumizing to remove bubbles, and standing for 30 minutes to obtain a uniformly mixed molten fluid II;

(5) the second molten fluid in the step (4) is subjected to extension pressing forming to prepare a sheet with a certain thickness and a certain using area, namely the pen point main body layer sheet;

(6) superposing the pen point outer layer sheet and the pen point main body layer sheet, heating to 60 ℃, then rolling and pressing the materials into a composite sheet with required thickness through a pressing roller, and cooling to room temperature to obtain the pen point composite sheet, wherein the pen point composite sheet comprises a pen point outer layer sheet 4 and a pen point main body layer sheet 5;

Example 8

The passive capacitive pen nib of example 3 was prepared as follows:

(1) weighing 110 parts of first nib base material silicon rubber, silver powder as a first conductive filler, copper powder and carbon nano tubes according to the weight parts in the nib outer layer formula, wherein the weight ratio of the silver powder to the copper powder to the carbon nano tubes is 20: 20: 1, and the wear-resistant auxiliary agent is tetrafluoroethylene (PTFE) and light calcium carbonate according to the weight ratio of 1:1 part to 16 parts, 3 parts of plasticizer phthalate, 2.5 parts of silane coupling agent, 2.5 parts of first dispersant fatty acid polyethylene glycol ester, 7 parts of carbon powder and 3 parts of vulcanizing agent for later use;

(4) weighing 480 parts of nitrile rubber as a second pen point base material, 15 parts of silver powder as a second conductive filler, 2.5 parts of titanate coupling agent, 3.5 parts of second dispersant fatty acid polyglycol ester and 3 parts of vulcanizing agent according to the parts by weight in the formula of the pen point main body layer, adding the materials into a mixing roll, mixing for 90 minutes at the temperature of 100 ℃, vacuumizing to remove bubbles, and standing for 30 minutes to obtain a uniformly mixed molten fluid II;

Example 9

The passive capacitive pen nib of example 4 was prepared as follows:

(2) adding a first pen point base material, a plasticizer and a silane coupling agent into a clean mixing mill, mixing for 30 minutes at the temperature of 150 ℃, then adding a first dispersing agent, a first conductive filler and a wear-resistant auxiliary agent, continuously mixing for 30 minutes, vacuumizing to remove bubbles, and standing for 90 minutes to obtain a uniformly mixed first molten fluid;

(4) weighing the raw materials in parts by weight in the formula of the pen point main body layer, adding the raw materials into a mixing roll, mixing for 30 minutes at the temperature of 150 ℃, vacuumizing to remove bubbles, and standing for 30 minutes to obtain a uniformly mixed molten fluid II;

(6) superposing the pen point outer layer sheet and the pen point main body layer sheet, heating to 80 ℃, then rolling and pressing the pen point outer layer sheet and the pen point main body layer sheet into a composite sheet with required thickness through a pressing roller, and cooling to room temperature to obtain the pen point composite sheet, wherein the pen point composite sheet comprises a pen point outer layer sheet 4 and a pen point main body layer sheet 5;

Example 10

The passive capacitive pen nib of example 5 was prepared as follows:

(2) adding a first pen point base material, a plasticizer and a silane coupling agent into a clean mixing mill, mixing for 120 minutes at the temperature of 60 ℃, then adding a first dispersing agent, a first conductive filler, a wear-resistant auxiliary agent, a coloring agent and a vulcanizing agent, continuously mixing for 120 minutes, vacuumizing to remove bubbles, and standing for 10 minutes to obtain a uniformly mixed first molten fluid;

(4) weighing the raw materials according to the weight parts in the formula of the pen point main body layer, adding the raw materials into a mixing mill, mixing for 120 minutes at the temperature of 60 ℃, vacuumizing to remove bubbles, and standing for 10 minutes to obtain a uniformly mixed molten fluid II;

(6) superposing the pen point outer layer sheet and the pen point main body layer sheet, heating to 50 ℃, rolling into a composite sheet with the required thickness by a press roller, and cooling to room temperature to obtain the pen point composite sheet, wherein the pen point composite sheet comprises a pen point outer layer sheet 4 and a pen point main body layer sheet 5;

Comparative example 1

The passive capacitive pen nib of the present comparative example was prepared as follows:

(1) weighing 120 parts of base material silicone rubber and conductive filler of silver powder and copper powder according to the formula of the nib outer layer material in the embodiment 1 in a weight ratio of 1:1, and the wear-resistant auxiliary agent is tetrafluoroethylene (PTFE), glass beads and light calcium carbonate according to the weight ratio of 1: 1:1 to 18 parts, 3 parts of plasticizer phthalate, 1.5 parts of silane coupling agent, 2 parts of dispersant vinyl bis stearamide, 5 parts of carbon powder and 1 part of vulcanizing agent for later use;

(2) adding a base material, a plasticizer and a coupling agent into a clean mixing mill, mixing for 60 minutes at the temperature of 100 ℃, then adding a dispersing agent, a conductive filler, a wear-resistant additive, a coloring agent and a vulcanizing agent, continuously mixing for 90 minutes, vacuumizing to remove bubbles, and standing for 30 minutes to obtain a uniformly mixed molten fluid I;

(3) the first molten fluid in the step (2) is subjected to rolling forming to prepare a sheet with a certain thickness and a certain use area, namely the nib raw material;

(4) putting the nib raw material into a nib mould of a hot press for heating, exhausting, maintaining pressure and forming;

(5) and cooling, demolding and finishing to obtain the passive capacitance pen point.

Comparative example 2

(1) weighing 400 parts of base material silicone rubber, 10 parts of conductive filler silver powder, 2 parts of silane coupling agent, 3 parts of dispersant fatty acid polyglycol ester and 1 part of vulcanizing agent according to the formula of the nib body layer material in the embodiment 1, adding the materials into a mixing roll, mixing for 90 minutes at the temperature of 100 ℃, vacuumizing to remove bubbles, and standing for 30 minutes to obtain uniformly mixed molten fluid;

(2) the molten fluid in the step (1) is subjected to rolling forming to prepare a sheet with a certain thickness and a certain use area, namely the nib raw material;

(3) putting the nib raw material into a nib mould of a hot press for heating, exhausting, maintaining pressure and forming;

(4) and cooling, demolding and finishing to obtain the hot-press formed passive capacitance pen point.

Example 11

In the present example, the pen tips of the passive capacitive pens of examples 1 to 5 and comparative examples 1 to 2 were used for performance test, and the test results are shown in the following table 1:

TABLE 1 test results of nib performance of the passive capacitive pens of examples 1 to 5 and comparative examples 1 to 2

As can be seen from table 1, the pen tip performance test results of the passive capacitive pen with the multi-level structural design according to the embodiments of the present invention are significantly better than the performance of the passive capacitive pen tip prepared by a single material formulation in each proportion.

According to the passive capacitive pen nib, the multi-stage structural design of the nib outer layer and the nib main body layer is carried out, so that the nib outer layer and the nib main body layer respectively have different attributes, the passive capacitive pen nib has multiple performance advantages, the comprehensive performance is excellent, and the problem that the nibs are different in performance when being made of materials of the same system in the traditional process and formula is effectively avoided; in the formula of the material of the outer layer of the pen point, the pen point has conductive performance by adding the conductive filler, the surface friction coefficient of the base material can be reduced by adding the wear-resistant auxiliary agent, the wear resistance and the writing smoothness of the pen point are improved, and better writing experience is achieved; because nib bulk layer material does not with screen direct contact, its formula is simple relatively with nib outer layer material, under the prerequisite of guaranteeing nib conductivity, has reduced the component as far as possible, makes passive form electric capacity pen nib mechanical strength higher, and structural toughness is better to play stronger supporting role. The passive capacitance pen nib has the advantages of high writing smoothness, good wear resistance, small screen impact sound, no damage to a screen, good conductivity and high mechanical strength.

Example 12

The passive capacitive pen of the embodiment comprises the passive capacitive pen nib of the invention.

The pen point of the passive capacitive pen has the advantages of high writing smoothness, good wear resistance, small screen impact sound, no damage to a screen, good conductivity and high mechanical strength, and the pen point of the passive capacitive pen obtains excellent writing experience after being assembled into the capacitive pen.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims

1. The utility model provides a passive form electric capacity pen nib which characterized in that: including nib outer layer and nib bulk layer, the outer cladding of nib is fixed in the surface of nib bulk layer, the nib outer layer includes the raw materials of following parts by weight:

2. the passive capacitive pen nib of claim 1, wherein: the pen point main body layer encloses an assembly groove; the ratio of the thickness of the nib outer layer to the thickness of the nib main body layer is 1:2 to 1: 20.

3. The passive capacitive pen nib of claim 1, wherein: the first nib base material and the second nib base material are the same.

4. The passive capacitive pen nib of claim 1, wherein: the first nib base material and the second nib base material are at least one selected from thermoplastic resin, thermoplastic rubber or silica gel materials.

5. The passive capacitive pen nib of claim 1, wherein: the first conductive filler and the second conductive filler are at least one selected from silver powder, copper powder, nano silver wires, carbon nano tubes, graphene, carbon black or graphite.

6. The passive capacitive pen nib of claim 1, wherein: the wear-resistant auxiliary agent comprises polytetrafluoroethylene and at least one of glass beads, light calcium carbonate or mica powder.

7. The passive capacitive pen nib of claim 1, wherein: the plasticizer is selected from at least one of phthalate, phosphate, aliphatic dibasic acid ester, fatty acid ester, benzene polyacid ester, polyol ester, epoxy hydrocarbon, alkyl sulfonate and the like; the first coupling agent and the second coupling agent are selected from at least one of silane coupling agent, titanate and aluminate coupling agent; the first dispersant and the second dispersant are selected from at least one of vinyl bis-stearamide, fatty acids, fatty amides, triethyl hexyl phosphoric acid and fatty acid polyethylene glycol ester; the first vulcanizing agent and the second vulcanizing agent are at least one selected from elemental sulfur, elemental selenium, elemental tellurium, sulfur-containing compounds and peroxides, quinone compounds, amine compounds, resin compounds, metal oxides and isocyanate, and the coloring agent is carbon powder.

8. A passive capacitive stylus comprising the tip of any one of claims 1 to 7.

9. The method for manufacturing a passive capacitive pen nib according to any one of claims 1 to 7, comprising the steps of:

preparing the nib outer sheet;

preparing the nib body layer sheet;

10. The method of making a passive capacitive pen nib of claim 9, wherein: