CN111892738A - Preparation method of waterborne polyurethane conductive sponge - Google Patents
Preparation method of waterborne polyurethane conductive sponge Download PDFInfo
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- CN111892738A CN111892738A CN202010822211.9A CN202010822211A CN111892738A CN 111892738 A CN111892738 A CN 111892738A CN 202010822211 A CN202010822211 A CN 202010822211A CN 111892738 A CN111892738 A CN 111892738A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/30—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by mixing gases into liquid compositions or plastisols, e.g. frothing with air
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/10—Block- or graft-copolymers containing polysiloxane sequences
- C08J2483/12—Block- or graft-copolymers containing polysiloxane sequences containing polyether sequences
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Abstract
The invention relates to the technical field of conductive sponges, and particularly discloses a preparation method of a waterborne polyurethane conductive sponge, which comprises the following steps: diluting the aqueous polyurethane emulsion to a solid content of 10-30%, and adding 0.5-1% of hydrophilic dispersant; adding 1-2% of carbon black into the diluted polyurethane solution, and stirring for 5-15 min; adding 2-3% of foaming agent into the polyurethane solution mixed with the carbon black, and mechanically stirring for about 10-20 min; taking out the mechanically stirred polyurethane foaming layer foam, and drying in a blast oven at 60-80 ℃; and placing the dried conductive sponge for 20-30 hours under the ventilation condition at room temperature. The preparation method of the conductive sponge of the invention can not cause harm to the environment and human body, and the polyurethane has the excellent characteristics of excellent elasticity, wear resistance, acid resistance, alkali resistance and the like, and the prepared sponge has good air permeability, simple process, mild reaction conditions and low large-scale production cost.
Description
Technical Field
The invention relates to the technical field of conductive sponges, in particular to a preparation method of a waterborne polyurethane conductive sponge.
Background
The sponge is generally produced by Polyurethane (PU) high polymer materials through a foaming technology, and has uniform foaming pore diameter and high elasticity. In the prior art, foaming resin, a foaming auxiliary agent and adhesive resin (which enables a finished product to have adhesiveness) are mixed together for foaming processing, the mixture is placed in a mould for foaming, and closed pores are broken by mechanical force, so that the foaming sponge is prepared; the resulting product generally had a density (d) of 0.028g/cm3 and a 25% compression hardness of 1.9 KPa. The PU sponge has the characteristics of heat preservation, heat insulation, sound absorption, shock absorption, flame retardance, static electricity prevention, good air permeability and the like, so the PU sponge relates to various industries, including the automobile industry, the battery industry, the cosmetic industry, the bra underwear manufacturing industry, the high-grade furniture manufacturing industry and the like.
The current method for manufacturing the conductive sponge generally comprises the steps of soaking the sponge in a conductive latex solution for a certain time and then carrying out drying treatment. The conductive latex solution is obtained by mixing a conductive solution and a latex solution, and conductive particles are adsorbed on the surface of the soaked sponge and are adhered through the latex particles. However, the sponge has insufficient adsorption capacity and uniformity to the conductive particles in the conductive solution, and the surface specific resistance and volume specific resistance of the conductive sponge are easily distributed unevenly.
In addition, the other method for manufacturing the conductive sponge comprises the steps of respectively adding graphene oxide, dye and polypyrrole monomers into deionized water to obtain a solution, adding an aqueous solution containing an oxidant into the obtained solution, stirring, and standing for 24-36 hours at 0-20 ℃; and filtering the obtained precipitate, washing the precipitate for 3 times by using methanol, dilute acid and distilled water respectively, and then drying the precipitate for 24 hours in vacuum at room temperature to obtain the polypyrrole and graphene oxide based sponge structure material. However, the method for preparing the conductive sponge has complex process, large consumption of acid, alcohol and other solutions and expensive raw material cost.
Disclosure of Invention
The invention aims to provide a preparation method of a waterborne polyurethane conductive sponge, which does not cause damage to the environment and human body, and has the advantages of simple process, mild reaction conditions and low large-scale production cost.
In order to solve the technical problems, the invention provides a preparation method of a waterborne polyurethane conductive sponge, which comprises the following steps:
diluting the aqueous polyurethane emulsion to a solid content of 10-30%, and adding 0.5-1% of hydrophilic dispersant;
adding 1-2% of carbon black into the diluted polyurethane solution, and stirring for 5-15 min;
adding 2-3% of foaming agent into the polyurethane solution mixed with the carbon black, and mechanically stirring for about 10-20 min;
taking out the mechanically stirred polyurethane foaming layer foam, and drying in a blast oven at 60-80 ℃;
and placing the dried conductive sponge for 20-30 hours under the ventilation condition at room temperature.
Preferably, the solid content of the diluted aqueous polyurethane emulsion is 20%.
Preferably, the mass fraction of the added carbon black is 1.5%, and the stirring time is 10 min.
Preferably, the mass fraction of the added foaming agent is 2%, and the mechanical stirring time is 20 min.
Preferably, the temperature of the air blowing oven is 70 ℃.
Preferably, the conductive sponge is placed for 24 hours under ventilation conditions at room temperature.
Preferably, the aqueous polyurethane is at least one of aromatic type, aliphatic type and cycloaliphatic type, and the ionization state of the hydrophilic group can be anion or cation.
Preferably, the hydrophilic dispersant is at least one of a polysiloxane hydrophilic agent, a polyester polyoxyethylene condensate, and a polyether-modified silicone.
Preferably, the foaming agent is at least one of coconut oil fatty acid diethanolamide, sodium dodecyl polyoxyethylene ether sulfate, foaming agent Stokal SR, foaming agent Stokal STA, foaming agent HR and foaming agent Ecoma-F911.
Preferably, the carbon black used has a mesh size of greater than 400 mesh.
The invention has the following beneficial effects:
(1) the polyurethane adopted by the invention is waterborne polyurethane, which does not cause harm to the environment and human body, and the polyurethane has the excellent characteristics of excellent elasticity, wear resistance, acid resistance, alkali resistance and the like, and the filtering resistance can be effectively reduced by preparing the polyurethane into a sponge shape, and the method has the advantages of simple process, mild reaction conditions and low large-scale production cost.
(2) According to the invention, the aqueous polyurethane is doped with the carbon black material, so that the conductivity of the aqueous polyurethane can be effectively improved, the structure is stable, the conductivity of the aqueous polyurethane cannot be reduced along with the passage of time, the surface specific resistance and the volume specific resistance of the aqueous polyurethane are small and uniform, and the aqueous polyurethane is a good conductive, porous and wear-resistant material.
Drawings
FIG. 1 is a flow chart of a preparation method provided by an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 1, step a, adding a certain amount of waterborne polyurethane into a container, adding distilled water into the container to dilute the solid content of the waterborne polyurethane to 10%, and adding 0.5% of polyether type organosilicon hydrophilic dispersant;
step B, adding 1% of carbon black into the prepared slurry in the step A;
step C, adding 2% of foaming agent HR into the slurry prepared with the carbon black, then uniformly stirring the mixture under a magnetic stirrer, and finally stirring the mixture on a mechanical stirring device for 20min, wherein the foam multiplying power is about 2 times of the original foaming multiplying power;
step D, pouring the foamed conductive polyurethane slurry into a prepared mould, and then putting the mould into a 60 ℃ oven for curing and molding;
and E, ventilating the conductive waterborne polyurethane foam sponge cured in the oven at room temperature for 20 hours to obtain the required porous conductive sponge material.
Example 2:
step A, adding a certain amount of waterborne polyurethane into a beaker, adding distilled water into the beaker to dilute the solid content of the waterborne polyurethane to 10%, and then adding 0.5% of polysiloxane hydrophilic dispersing agent;
step B, adding 2% of carbon black into the prepared slurry in the step A;
step C, adding 2.5% of foaming agent Ecoma-F911 into the slurry prepared with the carbon black, then uniformly stirring the mixture under a magnetic stirrer, and finally stirring the mixture on a mechanical stirring device for 20min, wherein the foam multiplying power is about 2.5 times of the original multiplying power;
d, pouring the foamed conductive polyurethane slurry into a prepared grinding tool, and then putting the prepared grinding tool into a 60 ℃ drying oven for curing and forming;
and E, ventilating the conductive waterborne polyurethane foam sponge cured in the oven at room temperature for 20 hours to obtain the required porous conductive sponge material.
Example 3:
step A, adding a certain amount of waterborne polyurethane into a beaker, adding distilled water into the beaker to dilute the solid content of the waterborne polyurethane to 15%, and then adding 0.75% of polysiloxane hydrophilic dispersing agent;
step B, adding 1% of carbon black into the prepared slurry in the step A;
step C, adding 2% of foaming agent HR into the slurry prepared with the carbon black, then uniformly stirring the mixture under a magnetic stirrer, and finally stirring the mixture on a mechanical stirring device for 15min, wherein the foam multiplying power is about 2 times of the original foaming multiplying power;
step D, pouring the foamed conductive polyurethane slurry into a prepared mould, and then putting the mould into a 65 ℃ oven for curing and molding;
and E, ventilating the conductive waterborne polyurethane foam sponge cured in the oven at room temperature for 25 hours to obtain the required porous conductive sponge material.
Example 4:
step A, adding a certain amount of waterborne polyurethane into a beaker, adding distilled water into the beaker to dilute the solid content of the waterborne polyurethane to 15%, and adding 1% of a polysiloxane hydrophilic dispersant;
step B, adding 1.5 percent of carbon black into the prepared slurry in the step A;
step C, adding 2% of foaming agent HR into the slurry prepared with the carbon black, then uniformly stirring the mixture under a magnetic stirrer, and finally stirring the mixture on a mechanical stirring device for 10min, wherein the foam multiplying power is about 1.5 times of the original multiplying power;
step D, pouring the foamed conductive polyurethane slurry into a prepared mould, and then putting the mould into a 70 ℃ oven for curing and molding;
and E, ventilating the conductive waterborne polyurethane foam sponge cured in the oven for 30 hours at room temperature to obtain the required porous conductive sponge material.
Example 5:
step A, adding a certain amount of waterborne polyurethane into a beaker, adding distilled water into the beaker to dilute the solid content of the waterborne polyurethane to 20%, and then adding 0.75% of polysiloxane hydrophilic dispersant;
step B, adding 2% of carbon black into the prepared slurry in the step A;
step C, adding 2% of foaming agent Ecoma-F911 into the slurry prepared with the carbon black, then uniformly stirring the mixture under a magnetic stirrer, and finally stirring the mixture on a mechanical stirring device for 20min, wherein the foam multiplying power is about 2.5 times of the original multiplying power;
d, pouring the foamed conductive polyurethane slurry into a prepared grinding tool, and then putting the prepared grinding tool into a 70 ℃ oven for curing and molding;
and E, ventilating the conductive waterborne polyurethane foam sponge cured in the oven for 30 hours at room temperature to obtain the required porous conductive sponge material.
Example 6:
step A, adding a certain amount of waterborne polyurethane into a beaker, adding distilled water into the beaker to dilute the solid content of the waterborne polyurethane to 20%, and then adding 0.75% of polysiloxane hydrophilic dispersant;
step B, adding 1.5 percent of carbon black into the prepared slurry in the step A;
step C, adding 2% of foaming agent Ecoma-F911 into the slurry prepared with the carbon black, then uniformly stirring the mixture under a magnetic stirrer, and finally stirring the mixture on a mechanical stirring device for 15min, wherein the foam multiplying power is about 2 times of the original multiplying power;
d, pouring the foamed conductive polyurethane slurry into a prepared grinding tool, and then putting the grinding tool into a 75 ℃ oven for curing and forming;
and E, ventilating the conductive waterborne polyurethane foam sponge cured in the oven for 30 hours at room temperature to obtain the required porous conductive sponge material.
Example 7:
step A, adding a certain amount of waterborne polyurethane into a beaker, adding distilled water into the beaker to dilute the solid content of the waterborne polyurethane to 25%, and adding 1% of a polysiloxane hydrophilic dispersant;
step B, adding 2% of carbon black into the prepared slurry in the step A;
step C, adding 2% of foaming agent HR into the slurry prepared with the carbon black, then uniformly stirring the mixture under a magnetic stirrer, and finally stirring the mixture on a mechanical stirring device for 20min, wherein the foam multiplying power is about 2 times of the original foaming multiplying power;
d, pouring the foamed conductive polyurethane slurry into a prepared grinding tool, and then putting the prepared grinding tool into a 70 ℃ oven for curing and molding;
and E, ventilating the conductive waterborne polyurethane foam sponge cured in the oven for 30 hours at room temperature to obtain the required porous conductive sponge material.
Example 8:
step A, adding a certain amount of waterborne polyurethane into a beaker, adding distilled water into the beaker to dilute the solid content of the waterborne polyurethane to 25%, and adding 1% of a polysiloxane hydrophilic dispersant;
step B, adding 2% of carbon black into the prepared slurry in the step A;
step C, adding 2.5% of foaming agent Ecoma-F911 into the slurry prepared with the carbon black, then uniformly stirring the mixture under a magnetic stirrer, and finally stirring the mixture on a mechanical stirring device for 20min, wherein the multiplying power of foam is about 2.5 times of the original multiplying power;
d, pouring the foamed conductive polyurethane slurry into a prepared grinding tool, and then putting the grinding tool into a 75 ℃ oven for curing and forming;
and E, ventilating the conductive waterborne polyurethane foam sponge cured in the oven for 30 hours at room temperature to obtain the required porous conductive sponge material.
The polyurethane adopted by the invention is waterborne polyurethane, which does not cause harm to the environment and human body, and the polyurethane has the excellent characteristics of excellent elasticity, wear resistance, acid resistance, alkali resistance and the like, and the filtering resistance can be effectively reduced by preparing the polyurethane into a sponge shape, and the method has the advantages of simple process, mild reaction conditions and low large-scale production cost. According to the invention, the aqueous polyurethane is doped with the carbon black material, so that the conductivity of the aqueous polyurethane can be effectively improved, the structure is stable, the conductivity of the aqueous polyurethane cannot be reduced along with the passage of time, the surface specific resistance and the volume specific resistance of the aqueous polyurethane are small and uniform, and the aqueous polyurethane is a good conductive, porous and wear-resistant material.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The preparation method of the waterborne polyurethane conductive sponge is characterized by comprising the following steps:
diluting the aqueous polyurethane emulsion to a solid content of 10-30%, and adding 0.5-1% of hydrophilic dispersant;
adding 1-2% of carbon black into the diluted polyurethane solution, and stirring for 5-15 min;
adding 2-3% of foaming agent into the polyurethane solution mixed with the carbon black, and mechanically stirring for about 10-20 min;
taking out the mechanically stirred polyurethane foaming layer foam, and drying in a blast oven at 60-80 ℃;
and placing the dried conductive sponge for 20-30 hours under the ventilation condition at room temperature.
2. The preparation method of the waterborne polyurethane conductive sponge as claimed in claim 1, wherein the preparation method comprises the following steps: the solid content of the diluted aqueous polyurethane emulsion is 20%.
3. The preparation method of the waterborne polyurethane conductive sponge as claimed in claim 1, wherein the mass fraction of the added carbon black is 1.5%, and the stirring time is 10 min.
4. The preparation method of the waterborne polyurethane conductive sponge as claimed in claim 1, wherein the mass fraction of the added foaming agent is 2%, and the mechanical stirring time is 20 min.
5. The preparation method of the waterborne polyurethane conductive sponge as claimed in claim 1, wherein the temperature of the air-blast oven is 70 ℃.
6. The preparation method of the waterborne polyurethane conductive sponge as claimed in claim 1, wherein the conductive sponge is placed for 24 hours under ventilation condition at room temperature.
7. The method for preparing the waterborne polyurethane conductive sponge according to claim 1, wherein the waterborne polyurethane is at least one of aromatic type, aliphatic type and cycloaliphatic type, and the ionization state of the hydrophilic group can be anion or cation.
8. The method for preparing the waterborne polyurethane conductive sponge according to claim 1, wherein the hydrophilic dispersant is at least one of polysiloxane hydrophilic agents, polyester polyoxyethylene condensates and polyether modified silicones.
9. The preparation method of the waterborne polyurethane conductive sponge as claimed in claim 1, wherein the foaming agent is at least one of coconut diethanolamide, sodium dodecyl polyoxyethylene ether sulfate, foaming agent Stokal SR, foaming agent StokalSTA, foaming agent HR and foaming agent Ecoma-F911.
10. The method for preparing the waterborne polyurethane conductive sponge as claimed in claim 1, wherein the mesh number of the used carbon black is more than 400 meshes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113651994A (en) * | 2021-08-09 | 2021-11-16 | 哈尔滨工业大学（威海） | Porous elastic conductive composite film and preparation method thereof |
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Cited By (1)
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| CN113651994A (en) * | 2021-08-09 | 2021-11-16 | 哈尔滨工业大学（威海） | Porous elastic conductive composite film and preparation method thereof |
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