WO2018036017A1

WO2018036017A1 - Antistatic molding composition comprising conductive fiberglass, and method of preparing same

Info

Publication number: WO2018036017A1
Application number: PCT/CN2016/108007
Authority: WO
Inventors: 肖世英; 黄骥
Original assignee: 五行科技股份有限公司
Priority date: 2016-08-24
Filing date: 2016-11-30
Publication date: 2018-03-01
Also published as: CN106280371B; CN106280371A

Abstract

The present invention discloses an antistatic molding composition comprising conductive fiberglass. The composition comprises, by weight percentage, the following: 35-75% of a resin, 20-55% of conductive fiberglass, 2-30% of an impact modifier, 0.5-30% of a flame retardant, 0.2-3% of an anti-drip agent, 0.05-1% of a lubricant, and 0.05-1% of a pigment, wherein the resin is a polycarbonate resin or a polyestercarbonate resin, and a component B may be fiberglass having a conductive sol-gel antimony-doped tin oxide coating layer on an outer surface thereof. The present invention also discloses a method of preparing the antistatic molding composition comprising conductive fiberglass. The antistatic molding composition prepared by the present invention can achieve a permanent antistatic effect, and has the following benefits: easy to be colored, having an aesthetically-pleasing appearance, employing well-chosen materials, having a scientific production process, easy to prepare, having a low cost, long service life, and wide applicability, and suitable for large-scale industrial production.

Description

Antistatic molding composition containing conductive glass fiber and preparation method thereof

Technical field

The invention belongs to the field of polymer materials, and in particular relates to an antistatic molding composition comprising conductive glass fibers and a preparation method thereof.

Background technique

With the development of technology and people's attention to the comfort of the home environment, high-end smart small appliances and smart home systems are becoming more and more popular. Emerging small household appliances, such as smart sweeping robots, wireless vacuum cleaners, etc., in addition to the traditional flame retardant and basic mechanical properties of the shell materials, due to the problem of material damage and poor process caused by static electricity, and the demand for materials is excellent. Conductive (antistatic) or electrical resistance.

Traditional permanent antistatic materials generally use permanent antistatic agents or carbon fibers to achieve a permanent antistatic effect. Permanent antistatic agents, such as MH2030 from Arkema, France, are special auxiliaries based on polyamide based on polyether segments. Generally, such antistatic agents are sensitive to environmental humidity, ie, high humidity and antistatic The effect is good, and vice versa; and such antistatic agents are not easy to color due to their own characteristics, it is difficult to make bright colors, or injection molding defects which are prone to weld lines during the injection molding process affect the appearance experience. A material that uses carbon fiber to achieve a permanent antistatic effect, because of the carbon fiber color limitation, the appearance of the product is black, and the color effect cannot be achieved. Therefore, it is necessary to develop a modified antistatic molding composition capable of achieving a permanent antistatic effect and being easily colored while satisfying various requirements of the product.

Summary of the invention

The present invention is directed to the deficiencies in the prior art, and provides a conductive glass fiber. Dimensional antistatic molding compositions and methods for their preparation to solve the problems in the prior art.

The present invention can be achieved by the following technical solutions: The present invention provides an antistatic molding composition comprising conductive glass fibers, the composition comprising: 35 to 75% resin (A), 20 to 55 by weight percent % conductive glass fiber (B), 2 ~ 30% impact modifier (C), 0.5 ~ 30% flame retardant (D), 0.2 ~ 3% anti-drip agent (E), 0.05 ~ 1% lubricant (F) and 0.05 to 1% of the pigment (G), wherein the resin is a polycarbonate resin or a polyester carbonate resin.

The composition of the present invention may further comprise optionally one or more additives such as 0.1 to 2% of an antioxidant, a heat stabilizer, a light stabilizer, a pigment, a mold release agent, a flow promoter, and the like.

The component A according to the present invention may be a single viscosity polycarbonate or polyester carbonate, or a polycarbonate or polyester carbonate of different viscosity, which can be transesterified, interfacially polymerized, solution polymerized, and bulk. Synthesis by polymerization or the like; the viscosity is related to the molecular weight of the component A, the concentration in the solution, and the temperature, wherein the average molecular weight of the polycarbonate or the polyester carbonate of a single viscosity or a different viscosity is selected from 45,000 to 90,000.

The component B conductive glass fiber of the invention is: the glass fiber substrate of the conductive glass fiber is pretreated to have good coating adhesion, and then the ruthenium doping is provided on the outer surface of the glass fiber. Tin oxide conductive sol gel coating layer; preferably, when the coating layer has a cerium mass content of 5 to 20% and the coating layer has a thickness of 2 to 5 um, the cerium-doped tin oxide coating layer can be uniformly distributed on the surface of the glass fiber The conductive glass fiber has excellent electrical conductivity, transparency, high temperature resistance, oxidation resistance, radiation resistance, and is not limited by the climatic environment and the use environment, and is more durable; more preferably, it is blended in glass fiber and bismuth. a nano silver coating layer is disposed between the tin oxide conductive sol gel coating layer, the nano silver coating layer has a thickness of 2-7 um; and the nano silver coating layer is disposed for the purpose of making the conductive effect stronger, and Nano A layer of antimony-doped tin oxide conductive sol gel coating layer is further provided on the basis of the silver coating layer in order to prevent the nano silver coating layer from falling off.

The component C impact modifier of the present invention may be a copolymer having a core-shell structure, which is a fine particle form composed of an elastomer core and at least one thermoplastic shell, and the particle size is generally 120 ～. 550 nm; the core of the above core-shell copolymer may be: isoprene, butadiene, alkyl acrylate, alkyl methacrylate homopolymer, silicone rubber elastomer, etc.; The shell of the copolymer is one or two or more compounds of styrene olefin, alkyl styrene, alkyl acrylate, alkyl methacrylate, or an aliphatic or aromatic vinyl compound containing a vinyl group. Copolymers such as styrene, acrylonitrile, vinyl acetate, etc.; the core-shell copolymers have higher impact resistance, thermal decomposition temperature and better wear resistance than other impact modifiers.

The structural formula D of the present invention contains at least a P=O double bond, such as a phosphate flame retardant, such as benzenediol diphosphate, oligobisphenol A bis(diphenyl phosphate), phosphoric acid. Tributyl ester or triphenyl phosphate has long-lasting flame retardant effect, good compatibility with other materials, water resistance, heat resistance and migration resistance.

The component E anti-drip agent of the present invention is a polytetrafluoroethylene (PTFE) anti-drip agent, which may be pure PTFE or PTFE coated with styrene acrylonitrile copolymer, except It plays a role in anti-drip, and can also significantly reduce the friction coefficient of the material surface, improve the anti-wear performance of the material itself, and at the same time play the role of internal lubrication and demoulding.

The component F lubricant of the invention is a graft modified polymer wax, such as graft modified polyethylene wax, graft modified polypropylene wax, graft modified ethylene-vinyl acetate copolymer wax, preferably Maleic anhydride modified polyethylene wax, which is easier to blend and bond with other materials.

The component G pigments described in the present invention are conventionally commercially available pigments for color development.

In order to achieve the above object, the technical measure adopted by the present invention is to provide an inclusion The preparation method of the antistatic molding composition of the conductive glass fiber comprises the steps of: modifying the polycarbonate resin or the polyester carbonate resin (A), the conductive glass fiber (B), and the anti-shock according to the above weight percentage ratio The agent (C), the flame retardant (D), the anti-drip agent (E), the lubricant (F) and the pigment (G) are mixed by a high-speed mixer, and then subjected to a twin-screw or single-screw extruder. Melt extrusion; granulation by pelletizer, the resulting pellets are dried in an oven at 80 ° C for 4 hours, and then obtained by injection molding; wherein the high speed mixer rotates at 800-1500 r/min and the extrusion temperature is 230-300. °C.

The above preparation method of the antistatic molding composition comprising the conductive glass fiber further comprises the following pretreatment steps:

The first step: ultrasonically treating the glass fiber in acetone or absolute ethanol or dichloromethane twice, then ultrasonically treating it twice in deionized water, and finally placing it in a hot air drying oven until it is dry;

The second step: optionally immersing the above-mentioned washed glass fiber into the nano silver glue solution, and after the surface thereof is sufficiently covered by the nano silver glue, it is dried by hot air at 70 to 90 ° C to obtain a surface-plated glass. fiber;

The third step: dissolving the crystal of tin tetrachloride in absolute ethanol for 15 to 30 minutes, and magnetically stirring to 80 to 85 ° C for 2 to 3 hours until the colorless transparent solution, and then placed in a constant temperature water bath at 30 ° C In the medium aging for 30 to 45 minutes, a stable pure tin dioxide sol is obtained; the cerium trichloride is dissolved in the tin dioxide sol solution according to the mass doping ratio of 5 to 20%, and then refluxed at 80 to 85 ° C. ~3h, finally placed in a 30 ° C constant temperature water bath for 12h, to obtain an antimony doped tin dioxide sol;

The fourth step: immersing the first-time washed glass fiber or the second-step silver-plated glass fiber into the sol obtained in the third step, and then uniformly and smoothly pulling out;

Step 5: Put the glass fiber impregnated in the fourth step into a drying oven at 80-85 ° C for 30-60 min, and finally put it into a muffle furnace at 450 ° C for 2 h to obtain a conductive glass fiber. Finished product.

The beneficial effects of the present invention over the prior art are that the present invention employs conductive glass fibers in place of conventional permanent antistatic agents or carbon fibers, wherein the conductive glass fibers are preferably provided by ruthenium-doped tin oxide conductive sol on the outer surface of the glass fibers. Compared with the traditional conductive carbon fiber, the composition of the composite material is superior to the conductive carbon fiber in the case of the tensile strength, and is easy to color; the antistatic property can be achieved with respect to the PC permanent antistatic agent MH2030. Requires, and in the case of close surface resistivity and vertical burning level, it has better tensile strength, bending performance, and better appearance of the product, easy coloring, suitable for environmental conditions of different humidity; Exquisite research, process science, convenient production, low cost, long service life and wide applicability, which is conducive to mass industrial production.

detailed description

The invention will be further elucidated in the following in conjunction with specific embodiments.

The raw materials used in the present invention are commercially available from the following companies:

100mg/L Ag solution: Shenzhen Shidejia Technology Co., Ltd.;

2% trisodium citrate solution: West Asia Reagent Company;

Tin tetrachloride crystal: Guangzhou Suyu Chemical Co., Ltd.;

Antimony trichloride: BEHRINGER TECHNOLOGY CO., LTD.;

Component A: A1 polycarbonate (referred to as PC), produced by Korea Lotte Chemical Co., Ltd., grade 1100;

A2 polyester carbonate (referred to as PEC), produced by Wuhan Hezhong Biochemical Manufacturing Co., Ltd.;

Glass fiber, produced by Jiangsu Shuangshan Group;

Component C: epoxy functionalized acrylic core-shell copolymer, manufactured by Dow, under the designation EXL2620;

Component D: oligomeric bisphenol A bis(diphenyl phosphate) (abbreviated as BDP), produced by Japan Big Eight Company, grade CR741;

Component E: Polytetrafluoroethylene (PTFE), produced by DuPont, USA, under the designation

A3800;

Component F: maleic anhydride modified polyethylene wax, lubricant, produced by Mitsui, Japan, grade 1105A;

Component G: red pigment: aminoketone toner, produced by Bayer, USA, grade EG red;

Conductive carbon fiber: produced by Dongguan Carbon Cable Composite Materials Co., Ltd.;

PC permanent antistatic agent MH2030: Shenzhen Jiejiayou Plastic Co., Ltd.

Preparation Example 1:

100 ml of 100 mg/L Ag solution was placed in a small beaker, 100 ml of 2% trisodium citrate solution was added, and irradiated under ultraviolet light of 254 nm for 60 min to obtain a yellow-brown highly dispersible nano silver gum solution.

The glass fiber was ultrasonically treated twice in dichloromethane, then ultrasonically treated twice in deionized water, and finally placed in a hot air drying oven until dry; then the washed glass fiber was immersed in the nano silver glue solution, After the surface thereof is sufficiently covered with nano silver paste, it is dried by hot air at 70 to 90 ° C to obtain a glass fiber coated with silver on the surface.

70.1 g of tin tetrachloride crystals were dissolved in 200 ml of absolute ethanol, ultrasonically shaken for 20 min, and magnetically stirred by heating to 80-85 ° C for 2.5 h until a colorless transparent solution. After being aged in a constant temperature water bath at 30 ° C for 30 min, a stable pure tin dioxide sol is obtained; 2.3 g of antimony trichloride is dissolved in the tin dioxide sol solution according to a mass doping ratio of 5%, and then at 80 It was refluxed at ~85 ° C for 2.5 h, and finally placed in a constant temperature water bath at 30 ° C for 12 h to obtain an antimony doped tin dioxide sol.

The above-mentioned washed glass fiber is directly immersed in the cerium-doped tin dioxide sol, and then uniformly and smoothly pulled out vertically; finally, the impregnated glass fiber is placed in a drying oven at 80-85 ° C for 30 min, and finally put The conductive glass fiber finished component B1 was obtained by entering the muffle furnace at a temperature of 450 ° C for 2 h.

Alternatively, the above-mentioned surface-plated glass fiber is immersed in an antimony doped tin dioxide sol, and then uniformly and smoothly pulled out vertically; finally, the impregnated glass fiber is placed in a drying oven at 80 to 85 ° C for 30 minutes, and finally It was placed in a muffle furnace at a temperature of 450 ° C for 2 h to obtain a conductive glass fiber finished component B2.

Example 1:

Weigh 4.2kg component A1, 4.0kg component B1, 0.5kg component C, 1.25kg component D, 0.02kg component E, 0.02kg component F, 0.01kg red pigment, and pass the above components through high speed. The mixer is uniformly mixed, the speed of the high-speed mixer is set to 1400r/min, and the melt extrusion is performed by a twin-screw or single-screw extruder, and the extrusion temperature is 230-300 ° C; and the granules are pelletized by the granulator to produce pellets. After drying in an oven at 80 ° C for 4 hours, a spline having a thickness of 1.6 mm was obtained by injection molding, the temperature of the injection molding machine was set to 270 ° C, and the injection pressure was 70 to 120 bar.

Example 2:

Weigh 4.2kg component A2, 4.0kg component B1, 0.5kg component C, 1.25kg Component D, 0.02kg component E, 0.02kg component F, 0.01kg red pigment, the above components are uniformly mixed by a high-speed mixer, the high-speed mixer speed is set to 1400r/min, and the twin-screw or single-screw extrusion The machine is melt extruded, and the extrusion temperature is 230-300 ° C; the pellet is pelletized by a granulator, and the resulting pellets are dried in an oven at 80 ° C for 4 hours, and then splined to obtain a spline having a thickness of 1.6 mm, and injection molded. The machine temperature was set to 270 ° C and the injection pressure was 70 to 120 bar.

Example 3:

Weigh 3.5kg component A1, 5.5kg component B1, 0.2kg component C, 0.7kg component D, 0.05kg component E, 0.04kg component F, 0.01kg red pigment, and pass the above components through high speed. The mixer is uniformly mixed, the speed of the high-speed mixer is set to 1400r/min, and the melt extrusion is performed by a twin-screw or single-screw extruder, and the extrusion temperature is 230-300 ° C; and the granules are pelletized by the granulator to produce pellets. After drying in an oven at 80 ° C for 4 hours, a spline having a thickness of 1.6 mm was obtained by injection molding, the temperature of the injection molding machine was set to 270 ° C, and the injection pressure was 70 to 120 bar.

Example 4:

Weigh 6.4kg component A1, 2.0kg component B1, 0.2kg component C, 1.05kg component D, 0.3kg component E, 0.02kg component F, 0.03kg red pigment, and pass the above components through high speed. The mixer is uniformly mixed, the speed of the high-speed mixer is set to 1400r/min, and the melt extrusion is performed by a twin-screw or single-screw extruder, and the extrusion temperature is 230-300 ° C; and the granules are pelletized by the granulator to produce pellets. After drying in an oven at 80 ° C for 4 hours, a spline having a thickness of 1.6 mm was obtained by injection molding, the temperature of the injection molding machine was set to 270 ° C, and the injection pressure was 70 to 120 bar.

Example 5:

Weigh 6.4kg component A1, 2.0kg component B2, 0.2kg component C, 1.05kg component D, 0.3kg component E, 0.02kg component F, 0.03kg red pigment, and pass the above components through high speed. The mixer is uniformly mixed, the speed of the high-speed mixer is set to 1400r/min, and the melt extrusion is performed by a twin-screw or single-screw extruder, and the extrusion temperature is 230-300 ° C; and the granules are pelletized by the granulator to produce pellets. After drying in an oven at 80 ° C for 4 hours, a spline having a thickness of 1.6 mm was obtained by injection molding, the temperature of the injection molding machine was set to 270 ° C, and the injection pressure was 70 to 120 bar.

Comparative example 1:

Weigh 4.2kg component A1, 4.0kg conductive carbon fiber, 0.5kg component C, 1.25kg component D, 0.02kg component E, 0.02kg component F, 0.01kg red pigment, and mix the above components at high speed. The machine is evenly mixed, the high-speed mixer is set to a speed of 1400r/min, and is melt-extruded by a twin-screw or single-screw extruder. The extrusion temperature is 230-300 ° C; and then pelletized by a granulator, the resulting pellets are Drying in an oven at 80 ° C for 4 hours, and then by injection molding to obtain a spline having a thickness of 1.6 mm, the temperature of the injection molding machine was set to 270 ° C, and the injection pressure was 70 to 120 bar.

Comparative example 2:

Weigh 4.2kg component A1, 4.0kg PC permanent antistatic agent MH2030, 0.5kg component C, 1.25kg component D, 0.02kg component E, 0.02kg component F, 0.01kg red pigment, The components are uniformly mixed by a high-speed mixer, the speed of the high-speed mixer is set to 1400r/min, and the melt extrusion is performed by a twin-screw or single-screw extruder, and the extrusion temperature is 230-300 ° C; and then pelletized by a granulator to generate The pellets are dried in an oven at 80 ° C for 4 small Then, a spline having a thickness of 1.6 mm was obtained by injection molding, and the temperature of the injection molding machine was set to 270 ° C, and the injection pressure was 70 to 120 bar.

Comparative example 3:

Weigh 6.4kg of component A1, 2.0kg of silver-plated glass fiber, 0.2kg of component C, 1.05kg of component D, 0.3kg of component E, 0.02kg of component F, 0.03kg of red pigment, The components are uniformly mixed by a high-speed mixer, the speed of the high-speed mixer is set to 1400r/min, and the melt extrusion is performed by a twin-screw or single-screw extruder, and the extrusion temperature is 230-300 ° C; and then pelletized by a granulator to generate The pellets were dried in an oven at 80 ° C for 4 hours, and then injection molded to obtain a spline having a thickness of 1.6 mm. The temperature of the injection molding machine was set to 270 ° C, and the injection pressure was 70 to 120 bar.

Observe the appearance properties of the materials obtained in the above examples and comparative examples and test the corresponding physical properties. According to the tensile strength of ISO 527 test materials, according to the bending properties of ISO 178 test materials, the impact properties of the test materials according to ISO 179, according to GB/ T1410-2006 used three-electrode method to determine the surface resistance of the material and converted it into the corresponding surface resistivity. The flame retardant properties of the material (1.6mm) were measured by UL94 burner. The specific results are shown in Table 1 below.

Table 1: Performance test results of the examples and comparative materials

The test results in the table show that, by using Example 1, Example 2 and Comparative Example 1, it can be seen that the conductive glass fiber is used instead of the conventional conductive carbon fiber, and the Charpy unnotched impact strength (ie, toughness) is equivalent under the tensile strength. It is obviously superior to conductive carbon fiber and easy to color; it can be seen from Example 1, Example 2 and Comparative Example 2 that the permanent antistatic agent MH2030 can be replaced by conductive glass fiber, which can achieve antistatic performance requirements and surface resistance. When the rate and vertical burning level are close, there is better tensile strength, bending performance, Charpy unnotched impact strength, and better appearance of the product, which is easy to color. It can be seen from Example 4, Example 5 and Comparative Example 3 that a guide for providing a ruthenium-doped tin oxide conductive sol gel coating layer on the outer surface of the glass fiber is used. The electric glass fiber replaces the conductive glass fiber with the nano silver coating layer on the surface, which can obviously overcome the defect that the nano silver coating layer is easily peeled off, and also has the tensile strength and the flexural modulus.

The above-mentioned embodiments are only the preferred technical solutions of the present invention, and should not be construed as limiting the present invention. The scope of the present invention should be construed as the technical solutions described in the claims, including the equivalents of the technical features in the technical solutions recited in the claims. It is also within the scope of the invention to provide a scope of protection, i.e. equivalent replacement improvements within this scope.

Claims

An antistatic molding composition comprising conductive glass fibers, characterized in that, by weight percentage, the composition comprises: 35 to 75% resin, 20 to 55% conductive glass fiber, 2 to 30% impact modification A 0.5 to 30% flame retardant, 0.2 to 3% anti-drip agent, 0.05 to 1% lubricant and 0.05 to 1% pigment, wherein the resin is a polycarbonate resin or a polyester carbonate resin.
The antistatic molding composition comprising conductive glass fibers according to claim 1, wherein the conductive glass fibers are provided with an antimony-doped tin oxide conductive sol gel coating on the outer surface of the glass fibers. The coating layer has a cerium mass content of 5 to 20% and a coating layer thickness of 2 to 5 um.
The antistatic molding composition comprising conductive glass fibers according to claim 2, wherein said conductive glass fibers are further further between the glass fibers and the antimony-doped tin oxide conductive sol gel coating layer. A nano silver coating layer is provided, and the nano silver coating layer has a thickness of 2-7 um.
The antistatic molding composition comprising conductive glass fibers according to claim 1, wherein the resin is a single viscosity polycarbonate or polyester carbonate, or a polycarbonate or a polymer having a different viscosity. Ester carbonate.
The antistatic molding composition comprising conductive glass fibers according to claim 1, wherein said impact modifier is a core-shell copolymer, which is an elastomer core and thermoplastic. The fine particle form of the shell, the size of the particles is 120-550 nm; the core of the above core-shell copolymer is: isoprene, butadiene, alkyl acrylate, alkyl methacrylate homopolymer, silicon Oxylate rubber elastomer; the above shell is styrene One or two or more compounds of an alkyl group, an alkyl styrene, an alkyl acrylate, an alkyl methacrylate, or a copolymer thereof with an aliphatic or aromatic vinyl compound containing a vinyl group.
The antistatic molding composition comprising conductive glass fibers according to claim 1, wherein the flame retardant is a phosphate flame retardant.
The antistatic molding composition comprising conductive glass fibers according to claim 6, wherein the phosphate flame retardant is benzenediol diphosphate, oligobisphenol A bis(diphenyl) Phosphate), tributyl phosphate or triphenyl phosphate.
The antistatic molding composition comprising conductive glass fibers according to claim 1, wherein the anti-drip agent is polytetrafluoroethylene, and the lubricant is maleic anhydride-modified polyethylene wax. .
A method for producing an antistatic molding composition comprising conductive glass fibers according to claim 1, comprising the steps of: polycarbonate resin or polyester according to the weight percentage ratio according to claim 1. Carbonate resin, mixed with other materials conductive glass fiber, impact modifier, flame retardant, anti-drip agent, lubricant and pigment through high-speed mixer, melt-squeezed through twin-screw or single-screw extruder The extrusion temperature is 230-300 ° C; the pellets are pelletized by a granulator, and the resulting pellets are dried in an oven at 80 ° C for 4 hours, and then obtained by injection molding; wherein the high-speed mixer rotates at 800-1500 r/min. The extrusion temperature is 230 to 300 °C.
A method of preparing an antistatic molding composition comprising conductive glass fibers according to claim 9, further comprising the following pretreatment steps:

Step 1: Ultrasonic treatment of glass fibers in acetone or absolute ethanol or dichloromethane 2 times, then placed in deionized water for 2 times, and finally placed in a hot air drying oven until dry;

The second step: optionally immersing the above-mentioned washed glass fiber into the nano silver glue solution, and after the surface thereof is sufficiently covered by the nano silver glue, it is dried by hot air at 70 to 90 ° C to obtain a surface-plated glass. fiber;

The third step: dissolving the crystal of tin tetrachloride in absolute ethanol for 15 to 30 minutes, and magnetically stirring to 80 to 85 ° C for 2 to 3 hours until the colorless transparent solution, and then placed in a constant temperature water bath at 30 ° C In the middle aging for 3 to 45 minutes, a stable pure tin dioxide sol is obtained; the cerium trichloride is dissolved in the tin dioxide sol solution according to the mass doping ratio of 5 to 20%, and then refluxed at 80 to 85 ° C. ~3h, finally placed in a 30 ° C constant temperature water bath for 12h, to obtain an antimony doped tin dioxide sol;

The fourth step: immersing the first-time washed glass fiber or the second-step silver-plated glass fiber into the sol obtained in the third step, and then uniformly and smoothly pulling out;

Step 5: The glass fiber impregnated in the fourth step is placed in a drying oven at 80-85 ° C for 30-60 min, and finally placed in a muffle furnace at a temperature of 450 ° C for 2 h to obtain a finished conductive glass fiber.