CN108609611B - High-stability environment-friendly water dispersion of carbon nano tube and preparation method thereof - Google Patents
High-stability environment-friendly water dispersion of carbon nano tube and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-stability environment-friendly carbon nanotube aqueous dispersion and a preparation method thereof. The method comprises the steps of mixing 1-5 parts by mass of carbon nano tubes, 0.5-20 parts by mass of lignosulfonate and 0.1-5 parts by mass of deionized water; and (3) adding water for dilution after grinding treatment, adjusting the pH value to 6-8, adding a stabilizer, and performing ultrasonic dispersion to obtain the stably dispersed carbon nano tube water dispersion. The stabilizer is one or more of Triton X-100, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, dodecyl hydroxy sulfobetaine and sodium methyl palmitate sulfonate. The invention has the characteristics of good carbon nanotube dispersing effect, high stability, high concentration, short process flow and preparation period, environmental friendliness, good compatibility with water-based resin and the like.
Description
Technical Field
The invention relates to a preparation method of a carbon nano tube dispersion liquid, in particular to a preparation method of a carbon nano tube dispersion stabilizer based on a water phase.
Background
The Carbon Nanotubes (CNTs) have excellent mechanical properties (elastic strength 150GPa, Young modulus 1200GPa), metal electrical conductivity (1104S/cm), thermal conductivity (3000W/m.K), electromagnetic wave shielding effect and length-diameter ratio of more than 1000, and are the best choice for preparing the enhanced composite material.
However, the surface of the carbon nanotube is chemically inert, lacks active groups, and has low solubility in water or organic solvents; in addition, the carbon nano tube has the characteristics of large specific surface area and large length-diameter ratio, so that the carbon nano tube is easy to agglomerate and wind in a solvent, and the application of the carbon nano tube is severely limited by the combination of the factors. Therefore, it is important and critical to make full use of the carbon nanotubes to enhance various properties of the composite material and to solve the problem of good dispersion of the carbon nanotubes.
At present, there are physical and chemical methods for preparing the carbon nanotube aqueous dispersion. Physical methods are high shear, sonication, or the addition of surfactants to dissolve in the solvent. According to the preparation method of the carbon nano tube dispersion liquid and the carbon nano tube cement-based composite material, through shearing and ultrasonic treatment, for example, the nano silica gel is used as a dispersing agent, the nano silica gel and the carbon nano tube are mixed in a container, then the mixture is stirred in a magnetic stirrer, and finally ultrasonic dispersion is carried out in ultrasonic dispersion equipment. However, this method is not very effective in dispersing, and the dispersion of the carbon nanotubes can be continued for a short time by shearing or ultrasonic treatment. For example, the nanocarbon material dispersion liquid and the preparation method thereof disclosed in chinese patent application CN 102180458A introduce a high pressure dispersion method, and the prepared carbon nanotube dispersion liquid can exist stably for a long time, but has high requirements for equipment due to high pressure requirements, and requires a special high pressure device, which is difficult to popularize.
There are two chemical treatment methods. Firstly, the surface of the carbon nano tube is modified by a chemical oxidation grafting method to obtain hydrophilic characteristic. For example, chinese patent application CN201410338909.8 discloses a method for preparing a high-concentration carbon nanotube dispersion, which comprises reacting carbon nanotubes in a strong oxidation solution to prepare carboxylated carbon nanotubes, performing amination treatment on the carboxylated carbon nanotubes, and finally obtaining the carbon nanotube dispersion with the assistance of ultrasound. However, the chemical oxidation method not only destroys the surface properties of the carbon nanotubes and greatly reduces the mechanical and electrical properties thereof, but also generates a large amount of acid, alkali and organic wastewater to pollute the environment.
Secondly, the carbon nano tube is grafted by the non-covalent bond of the surfactant to ensure that the carbon nano tube obtains hydrophilicity. The existing dispersing agents for dispersing the carbon nanotubes are chemical synthesis type small molecular compounds, such as CTAB, SDS, SDBS and the like, and although the dispersing agents have a certain dispersing effect, the dispersing effect is not ideal because the steric hindrance which can be improved when the dispersing agents are adsorbed on the surfaces of the carbon nanotubes is small.
Chinese patent application CN 101173107a discloses a method for preparing lignin-inorganic nanocomposite; the method also needs to use concentrated acid for precipitation treatment after dispersion treatment, and the obtained material still needs to be washed for many times to remove the adsorbed acidity, thus being greatly limited in application. The Chinese patent application CN 104356674A discloses a preparation method of a carbon nano tube lignin compound, the used carbon nano tube can be compounded with lignin after concentrated acid and acyl chlorination treatment, the steps are complex, the energy consumption is large, acid and alkali and organic waste liquid are generated, and the environmental pollution is great.
Disclosure of Invention
The invention mainly solves the problems of easy agglomeration, small dispersion concentration, poor stability and serious environmental pollution of the carbon nano tubes in the existing carbon nano tube dispersion liquid, and provides the high-stability environment-friendly carbon nano tube aqueous dispersion liquid.
The purpose of the invention is realized by the following technical scheme:
the preparation method of the environment-friendly carbon nano tube aqueous dispersion with high stability comprises the following steps: mixing 1-5 parts of carbon nano tube, 0.5-20 parts of lignosulfonate and 0.1-5 parts of deionized water in parts by mass; adding water for dilution after grinding treatment, adjusting the pH value to 6-8, adding a stabilizer, and performing ultrasonic dispersion to obtain a stably dispersed carbon nanotube water dispersion; the stabilizer is one or more of Triton X-100, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, dodecyl hydroxy sulfobetaine and sodium methyl palmitate sulfonate.
To further achieve the object of the present invention, preferably, the carbon nanotube is one of a single-walled carbon nanotube, a double-walled carbon nanotube, a multi-walled carbon nanotube, a nitrogen-doped carbon nanotube and a fluorine-doped carbon nanotube.
Preferably, the lignosulfonate is one or more of calcium lignosulfonate, sodium lignosulfonate and iron-chromium lignosulfonate; the molecular weight of the lignosulfonate is 5000-10000.
Preferably, the grinding treatment is manual mortar grinding or ball mill grinding; the grinding material for grinding treatment is one of carborundum, brown corundum, white corundum, black corundum, silicon carbide, walnut shell and corncob; the grinding time is 0.5-8 h.
Preferably, the dilution factor by adding water is 1-500 times.
Preferably, the dosage of the stabilizer is 5-50 times of the mass of the carbon nano tube.
Preferably, the ultrasonic power of the ultrasonic dispersion is 70-120W, and the time is 0.15-3 h.
Preferably, the pH is adjusted by using dilute hydrochloric acid or NaOH solution.
Preferably, the concentration of the dilute hydrochloric acid is 0.1M; the concentration of the NaOH solution was 0.1M.
The high-stability environment-friendly carbon nanotube aqueous dispersion is prepared by the preparation method, the apparent color of the carbon nanotube aqueous dispersion is dark black, the Zeta potential of the aqueous dispersion is-40 mV to-80 mV, the hydrated particle size is 450nm to 650nm, and the aqueous dispersion can be stably placed for more than 6 months without any precipitation and delamination.
The lignosulfonate is a derivative of biomass resource lignin with the second most abundant natural content and can be biologically regenerated. Meanwhile, the lignosulfonate is a main waste and pollutant in the acid pulping and papermaking industry, is low in price and is sufficient in supply. The lignosulfonate has great application potential and competitive advantages in concrete water reducing agents, water coal additives, pesticide dispersants, printing ink and dye dispersants. The method has important significance for solving the environmental pollution and protecting the ecological environment by dispersing the carbon nano tube by using the lignosulfonate, and meets the requirements of sustainable development and green chemistry.
In the prior art, lignosulfonate, as an amphiphilic molecule, has a strongly hydrophilic sulfonate segment at one end and a hydrophobic aromatic segment at the other end, and can be essentially used as a surfactant to act as a dispersant, stabilizer or to reduce the surface energy of a system. In industrial and pesticide application, sodium lignosulfonate is directly added into a system as an additive, micelles are naturally formed in the system due to the action of the lowest surface energy, and thus dispersoids are wrapped and dispersed in a dispersing agent, so that the system can form a colloid system in a metastable state. In the system, a large amount of lignosulfonate and dispersoid form weak connection of intermolecular force by hydrophobic effect, and the weak connection is easily destabilized by external influence to break micelles and precipitate the dispersoid. In agriculture, the sodium lignin sulfonate, a metastable micelle system, can wrap and slowly release pesticides, and lignin is a natural polymer, can be decomposed by microorganisms and enters biological circulation, so that the environment-friendly and harmless micelle system is environment-friendly and recyclable. In industry, the structure of sodium lignosulfonate has certain rigidity effect and hard water hardness reducing effect, so that the structural strength, crystallinity and density of a cement matrix can be improved. The difference of the lignosulfonate of the invention from the prior art is that the carbon nano tube and the lignosulfonate form a strong intermolecular force by extruding and compressing the intermolecular distance of the carbon nano tube and the lignosulfonate through the grinding strong shearing force, the lignosulfonate is adsorbed and wound on the surface of the carbon nano tube, and the carbon nano tube can be well dispersed in water because the surface of the carbon nano tube is grafted by a strong hydrophilic group. The stability of the system can be increased by adding the negative electricity stabilizer. Unlike the surfactant action of the traditional lignosulfonate, the method is characterized in that sodium lignosulfonate is used as a modifier to graft sulfonate onto the surface of the carbon nanotube with strong shearing force so as to endow the carbon nanotube with hydrophilicity.
The mechanism of the invention is as follows: the method is characterized in that lignosulfonate has an amphiphilic property and a ring-shaped conjugated structure, under the condition of a water phase, lignosulfonate is used as a dispersing agent used in the process of preparing the carbon nano tube, in the grinding process, the fragment of the agglomerated carbon nano tube is stripped, and lignosulfonate forms pi-pi conjugated action with the carbon nano tube through an aromatic ring structure of lignosulfonate and is adsorbed to the surface of the carbon nano tube; meanwhile, the lignosulfonate has charged groups such as sulfonic acid groups and the like, and negative charges of the lignosulfonate form a double-layer structure on the surface of the carbon nano tube, so that the carbon nano tube is effectively prevented from being agglomerated by electrostatic repulsion; on the other hand, the lignosulfonate has a unique three-dimensional network structure and has larger steric hindrance compared with a straight-chain type high-molecular anionic surfactant. Therefore, the lignosulfonate can effectively prevent agglomeration between the carbon nanotubes. Meanwhile, lignosulfonate is weak in hydrophobicity, and can be improved in hydrophobicity, the hydrophobic effect of the carbon nano tube is enhanced, the adsorption capacity is increased by adding a negatively charged stabilizer and the like for non-covalent bond modification, so that the dispersion of the water-based carbon nano tube is facilitated.
The invention has the beneficial effects that:
1. the invention overcomes the problems of easy agglomeration and difficult dispersion of the carbon nano tube in the aqueous solution, and obtains the carbon nano tube aqueous dispersion with high stability (no layering or precipitation phenomenon in 6 months) and high concentration (the highest concentration can reach 3 g/L).
2. The method uses the waste lignosulfonate in the acid pulping and papermaking process as the dispersing agent, is green and environment-friendly, can be biologically regenerated, is environment-friendly, and does not need a concentrated acid, a concentrated alkali and a strong oxidant in the dispersing process, so that the preparation process has no pollution to the environment to human bodies.
3. The method uses water as a reaction medium, avoids using toxic and harmful organic solvents, and is green and environment-friendly.
4. The invention adopts the surfactant with negative electricity as the stabilizer, enhances the dispersion stability of the carbon nano tube-lignosulfonate, and the obtained dispersion has high stability and wide applicable range.
5. The carbon nano tube aqueous dispersion prepared by the invention has the characteristic of high stability in water, so that the carbon nano tube aqueous dispersion has good compatibility with aqueous resin, does not have the defect of film formation, and is suitable for being added into matrix resin as an additive to prepare functional resin with high added value.
6. The preparation process is carried out under normal pressure, the steps of the process are few, the preparation period is short, the cost performance is excellent, and the industrial production value is high.
Drawings
FIG. 1 is a high-power scanning electron microscope image of the environmentally friendly aqueous dispersion of carbon nanotubes with high stability obtained in example 1.
FIG. 2 is a photograph of the high-stability and environmentally friendly aqueous dispersion of carbon nanotubes obtained in example 1 and pristine carbon nanotubes.
Fig. 3 shows the high-stability environment-friendly carbon nanotube aqueous dispersion obtained in example 1 and a hydroxyl acrylic acid aqueous dispersion provided by bayer corporation under the designation 2470: 1 proportion and preparing a paint film appearance picture according to a paint film coating method in GB/T1727-1992.
Detailed Description
For better understanding of the present invention, the present invention is further illustrated by the following specific examples, which are not intended to limit the scope of the claims of the present invention, and other examples obtained by those skilled in the art without inventive efforts shall fall within the scope of the present invention.
In the embodiment of the present invention, a Malvern particle size analyzer (Malvern, ZS Nano S) was used to test the Zeta potential of the aqueous solution of carbon nanotubes, and the dispersion stability of the carbon nanotubes was analyzed.
In the embodiment of the invention, a Malvern particle size analyzer (Malvern, ZS Nano S) is used for testing the hydration particle size of the carbon Nano tube aqueous solution, and the dispersion stability of the carbon Nano tube is analyzed.
The embodiment of the invention uses the method described in GB/T6753.3-1986 to measure the stability of the carbon nano tube dispersion by a centrifugal sedimentation method.
In the embodiment of the invention, a scanning electron microscope (FE-SEM, SU-8200, Japan) is used for representing the micro-dispersion condition of the carbon nanotubes in the carbon nanotube aqueous solution.
The embodiment of the invention uses hydroxyl acrylic acid aqueous dispersion and carbon nano tube aqueous solution with the mark number of 2470 provided by Bayer company, wherein the weight ratio of 1: 1 proportion, preparing a paint film according to a paint film blade coating method in GB/T1727-1992, and observing the characteristics of the paint film to judge the compatibility of the carbon nano tube aqueous dispersion and the resin.
Example 1
According to mass fraction, 1 part of multi-wall carbon nano-tube (CNT-E3010, Zhongshan Ka super plastics Co., Ltd.), 10 parts of sodium lignosulfonate (NF-2, Yanbian double deer industry Co., Ltd.), the content of reducing substances is less than or equal to 12 percent, and the content of inorganic salts is less than or equal to 3.0 percent (Na)2SO4) 0.2 parts of deionized water, and artificially grindingGrinding for 3h, adding 400 parts of deionized water for dilution after grinding treatment, adjusting the pH to 7 by using 0.1M dilute hydrochloric acid or 0.1M dilute NaOH solution, and adding 5 parts of sodium dodecyl benzene sulfonate for ultrasonic dispersion for 0.5h to obtain the stably dispersed carbon nanotube aqueous dispersion.
FIG. 1 is a high-magnification scanning electron microscope (FE-SEM, SU-8200, Japan) photograph of the environmentally friendly aqueous dispersion of carbon nanotubes having high stability obtained in example 1. The figure shows that the carbon nano tubes are uniformly dispersed and are in a single-layer flat state, and the carbon nano tubes can be well dispersed in a solvent system after being modified.
FIG. 2 is a photograph of the highly stable and environmentally friendly aqueous dispersion of carbon nanotubes obtained in example 1 and pristine carbon nanotubes using a digital camera (Olibbas E-M10 II). As seen from the figure, the carbon nano tube dispersed by the method of the invention has high stability and no precipitation and delamination after long-term storage.
The obtained carbon nanotube aqueous dispersion had an apparent color of dark black and a concentration of 2.5 g/L. The aqueous dispersion was found to have a Zeta potential of-56.8 mV and a hydrated particle size of 523.2nm, and no precipitate was observed after centrifugation at 5000r/min for 15min using a centrifuge. The carbon nano tube water dispersion liquid is proved to have good stability. Generally, the larger the absolute value of the Zeta potential is, the more no precipitation is found in the centrifugal sedimentation test, and the dispersion stability can be proved to be more than 3 months. Compared with the preparation method of the carbon nano tube lignin compound disclosed in the Chinese patent application CN 104356674A in the background art, the used carbon nano tube can be compounded with lignin after concentrated acid and acyl chlorination treatment, the steps are complex, the energy consumption is large, acid and alkali and organic waste liquid are generated, and the environmental pollution is great.
The hydroxyl acrylic acid aqueous dispersion with the mark number of 2470 provided by Bayer company and a carbon nano tube aqueous solution are mixed in a proportion of 1: 1, preparing a paint film according to a paint film blade coating method in GB/T1727-1992, observing that the paint film is uniform black in appearance and does not find any granular substance, and proving that the compatibility of the carbon nano tube aqueous dispersion and the water-based resin is good. Fig. 3 shows the high-stability environment-friendly carbon nanotube aqueous dispersion obtained in example 1 and a hydroxyl acrylic acid aqueous dispersion provided by bayer corporation under the designation 2470: 1 proportion and preparing a paint film appearance picture according to a paint film coating method in GB/T1727-1992. The figure shows that the carbon nano tube modified by the invention can be well compatible with aqueous resin, has no defects in film formation, and is suitable for being used as an additive to be added into a resin matrix to prepare functional resin with high added value.
Example 2
According to mass fraction, 1 part of multi-walled carbon nano-tube (CNT-E3010, Zhongshan Ka super-plastic Co., Ltd.), 7 parts of calcium lignosulfonate (M-9, Yanbian Shi 23704Shuanglu Dow industries Co., Ltd., content of reducing substances is less than or equal to 12%, content of calcium and magnesium particles is less than or equal to 1.5%), 0.4 part of deionized water are mixed, a ball mill is used for grinding for 3 hours, 500 parts of deionized water is added for dilution after grinding treatment, pH is adjusted to 8, and 5 parts of sodium dodecyl sulfate is added for ultrasonic dispersion for 1 hour to obtain the stably dispersed carbon nano-tube aqueous dispersion liquid.
The obtained carbon nanotube aqueous dispersion had an apparent color of dark black and a concentration of 2.0 g/L. The Zeta potential of the aqueous dispersion was determined to be-54.2 mV, the hydrated particle size was determined to be 600.2nm, and no precipitate was found by centrifugation at 5000r/min for 15min using a centrifuge. The carbon nano tube water dispersion liquid is proved to have good stability.
And a hydroxyl acrylic acid aqueous dispersion and a carbon nano tube aqueous solution which are provided by Bayer company and have the trade mark of 2470 are mixed in a proportion of 1: 1 proportion, preparing a paint film according to a paint film blade coating method in GB/T1727-1992, observing that the paint film is uniform black in appearance and does not find any granular substance, and proving that the compatibility of the carbon nano tube water dispersion and the water-based resin is good.
Example 3
By mass fraction, 2 parts of single-walled carbon nanotube (TNST, China age nanometer), 10 parts of sodium lignosulfonate (NF-2, Yanbian Shuanglu industry Limited liability company, the content of reducing substances is less than or equal to 12%, the content of inorganic salts is less than or equal to 3.0% (Na2SO4)), 0.6 part of deionized water are mixed, ground by a ball mill for 2 hours, added with 500 parts of deionized water for dilution after grinding treatment, adjusted to have a pH value of 7, and added with 10 parts of dodecyl hydroxy sulfobetaine for ultrasonic dispersion for 1 hour to obtain the stably dispersed carbon nanotube aqueous dispersion.
The obtained carbon nanotube aqueous dispersion had a dark black color and a concentration of 4.0 g/L. The Zeta potential of the aqueous dispersion was determined to be-59.2 mV, the hydrated particle size was 590.8nm, and no precipitate was observed upon centrifugation using a centrifuge at 5000r/min for 15 min. The carbon nano tube water dispersion liquid is proved to have good stability.
And a hydroxyl acrylic acid aqueous dispersion and a carbon nano tube aqueous solution which are provided by Bayer company and have the trade mark of 2470 are mixed in a proportion of 1: 1 proportion, preparing a paint film according to a paint film blade coating method in GB/T1727-1992, observing that the paint film is uniform black in appearance and does not find any granular substance, and proving that the compatibility of the carbon nano tube water dispersion and the water-based resin is good.
Example 4
According to mass fraction, 1.5 parts of single-walled carbon nanotubes (TNST, China age nanometer), 10 parts of calcium lignosulfonate (M-9, Yanbian Shi \23704ShuangluLimited company, the content of reducing substances is less than or equal to 12%, the content of calcium and magnesium particles is less than or equal to 1.5%) and 0.6 part of deionized water are mixed, ground by a ball mill for 6 hours, diluted by 500 parts of deionized water after grinding treatment, the pH value is adjusted to 7, and 10 parts of methyl palmitate sodium sulfonate is added for ultrasonic dispersion for 1 hour to obtain the stably dispersed carbon nanotube aqueous dispersion liquid.
The obtained carbon nanotube aqueous dispersion had a dark black color and a concentration of 3 g/L. The Zeta potential of the aqueous dispersion was determined to be-64.2 mV, the hydrated particle size was 550.3nm, and no precipitate was observed upon centrifugation using a centrifuge at 5000r/min for 15 min. The carbon nano tube water dispersion liquid is proved to have good stability.
And a hydroxyl acrylic acid aqueous dispersion and a carbon nano tube aqueous solution which are provided by Bayer company and have the trade mark of 2470 are mixed in a proportion of 1: 1 proportion, preparing a paint film according to a paint film blade coating method in GB/T1727-1992, observing that the paint film is uniform black in appearance and does not find any granular substance, and proving that the compatibility of the carbon nano tube water dispersion and the water-based resin is good.
It should be noted that the present invention is not limited by the above-mentioned embodiments, and various changes and modifications can be made in the present invention without departing from the spirit and scope of the invention, and these changes and modifications fall into the scope of the invention as claimed. The scope of the invention is defined by the following claims.
Claims (8)
1. The preparation method of the environment-friendly carbon nano tube aqueous dispersion with high stability is characterized by comprising the following steps: mixing 1-5 parts of carbon nano tube, 0.5-20 parts of lignosulfonate and 0.1-5 parts of deionized water in parts by mass; adding water for dilution after grinding treatment, adjusting the pH value to 6-8, adding a stabilizer, and performing ultrasonic dispersion to obtain a stably dispersed carbon nanotube water dispersion; the stabilizer is one or more of Triton X-100, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, dodecyl hydroxy sulfobetaine and sodium methyl palmitate sulfonate; the lignosulfonate is one or more of calcium lignosulfonate, sodium lignosulfonate and iron-chromium lignosulfonate; the molecular weight of the lignosulfonate is 5000-10000; the dosage of the stabilizer is 5-50 times of the mass of the carbon nano tube;
the concentration of the aqueous dispersion of the carbon nano tube is 0.05 mg/ml-3 mg/ml, the Zeta potential of the aqueous dispersion of the carbon nano tube is-40 mV to-80 mV, the hydrated particle size is 450 nm-650 nm, and the aqueous dispersion can be stably placed for more than 6 months without any precipitation and delamination.
2. The method as claimed in claim 1, wherein the carbon nanotubes are selected from single-walled carbon nanotubes, double-walled carbon nanotubes, multi-walled carbon nanotubes, nitrogen-doped carbon nanotubes, and fluorine-doped carbon nanotubes.
3. The method for preparing the aqueous dispersion of highly stable environmentally friendly carbon nanotubes as claimed in claim 1, wherein the grinding process is a manual mortar grinding or ball mill grinding; the grinding material for grinding treatment is one of carborundum, brown corundum, white corundum, black corundum, silicon carbide, walnut shell and corncob; the grinding time is 0.5-8 h.
4. The method for preparing the aqueous dispersion of highly stable environmentally friendly carbon nanotubes as claimed in claim 1, wherein the dilution factor with water is 1-500 times.
5. The method for preparing the aqueous dispersion of the carbon nanotubes with high stability and environmental protection as claimed in claim 1, wherein the ultrasonic power of the ultrasonic dispersion is 70-120W, and the time is 0.15-3 h.
6. The method of claim 1, wherein the pH of the aqueous dispersion of highly stable environmentally friendly carbon nanotubes is adjusted by using dilute hydrochloric acid or NaOH solution.
7. The method of claim 6, wherein the concentration of the diluted hydrochloric acid is 0.1M; the concentration of the NaOH solution was 0.1M.
8. The preparation method is characterized in that the high-stability environment-friendly carbon nanotube aqueous dispersion is prepared by the preparation method of any one of claims 1 to 7, the concentration of the carbon nanotube aqueous dispersion is 0.05mg/ml to 3mg/ml, the apparent color is dark black, the Zeta potential of the aqueous dispersion is-40 mV to-80 mV, the hydrated particle size is 450nm to 650nm, and the aqueous dispersion can be stably placed for more than 6 months without any precipitation and delamination phenomenon.
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| CN114958062B (en) * | 2022-05-26 | 2024-02-13 | 苏州纳普乐思纳米材料有限公司 | Environment-friendly carbon nano tube antistatic agent and film |
| CN115895220A (en) * | 2022-11-03 | 2023-04-04 | 四川坚卓装配式建筑科技有限公司 | Heat-conducting insulating cable protection pipe and preparation method thereof |
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