CN112552713B - Preparation method of carbon black aqueous phase dispersion liquid special for fruit cultivation bag paper - Google Patents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/44—Carbon
- C09C1/48—Carbon black
- C09C1/56—Treatment of carbon black ; Purification
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/44—Carbon
- C09C1/48—Carbon black
- C09C1/56—Treatment of carbon black ; Purification
- C09C1/58—Agglomerating, pelleting, or the like by wet methods
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/08—Treatment with low-molecular-weight non-polymer organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/10—Treatment with macromolecular organic compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/42—Coatings with pigments characterised by the pigments at least partly organic
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- Inorganic Chemistry (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The invention relates to a preparation method of a special carbon black aqueous phase dispersion liquid for fruit bag paper, belonging to the field of functional pigments for papermaking coatings. Based on the DLVO dispersion stability theory, the invention creatively utilizes the electrostatic effect formed by sodium lauroyl sarcosine and the steric hindrance effect formed by hydroxypropyl methylcellulose, and fully exerts the synergistic effect of the sodium lauroyl sarcosine and the hydroxypropyl methylcellulose through optimizing the dispersion process to prepare the carbon black aqueous phase dispersion liquid with high stability. The raw materials are environment-friendly, pollution-free and wide in source, and are environment-friendly materials, so that the synthesized dispersing agent is environment-friendly and safe, the environment-friendly property of the dispersing agent is ensured from the source, and the trend requirement of modern environment protection is met; the carbon black aqueous phase dispersion liquid prepared based on the method is uniform and stable in dispersion, and creates good conditions for subsequent functional application.
Description
Technical Field
The invention relates to the field of functional pigments for papermaking coatings, in particular to a preparation method of a carbon black aqueous phase dispersion liquid special for fruit bag cultivation paper.
Background
The fruit-cultivating bag paper is used as paper for high-added-value agricultural technology and is more and more widely applied in China, wherein the black layer paper part of the fruit-cultivating bag paper is dyed by carbon black, so that the light shielding capability is improved, and the fruit quality is improved.
The preparation method of the black layer paper of the fruit cultivation bag paper mainly comprises two methods: firstly, a wet-end forming method is adopted, wherein fillers such as carbon black and the like are mainly deposited between or on the plant fibers in a physical and/or chemical method, and a thin paper sheet with certain strength is obtained by a traditional wet-end forming technology; secondly, a surface coating method is adopted, fillers such as carbon black and the like are used as main raw materials, auxiliaries such as adhesives and the like are used as auxiliary materials, the special coating for the fruit bag paper is prepared, and a functional coating is formed on the surface of the paper in a surface coating mode, so that the coated fruit bag paper is obtained. However, carbon black has very small primary particles and a large surface area, and generates extremely strong surface energy when dispersed in a water body, so that agglomeration occurs in slurry/coating, the black layer paper of the prepared fruit bag paper has serious black leakage and uneven coloring, and fruits generate local high temperature to damage the fruits. In more serious cases, the production efficiency is reduced, and a large amount of carbon black flows into wastewater, which not only consumes energy, but also affects the environment.
In order to solve the problems of serious loss and uneven dispersion of carbon black in slurry/coating, it is urgently needed to develop a carbon black aqueous phase dispersion liquid for fruit bag paper, uniformly dispersing carbon black, keeping the carbon black in a good and stable dispersion state, and adding the carbon black into the slurry/coating to uniformly disperse the carbon black in the slurry/coating.
Disclosure of Invention
The invention provides a preparation method of a carbon black aqueous phase dispersion liquid special for fruit bag paper, aiming at the problems of serious loss and uneven dispersion of carbon black in slurry/coating, and the dispersion stability of a carbon black aqueous phase is improved through electrostatic action and steric hindrance effect.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a preparation method of a special carbon black aqueous phase dispersion liquid for fruit bag paper comprises the following steps:
(1) preparing a sodium lauroylsarcosine solution: dissolving 0.6-1.4 wt% (to absolute dry carbon black) of sodium lauroyl sarcosinate in 40 ml of deionized water, adjusting the pH to 8.0-8.5, and shearing and stirring for several minutes to obtain a sodium lauroyl sarcosinate solution;
(2) preparing a hydroxypropyl methyl cellulose solution: dissolving 0.6-1.4 wt% (to absolute dry carbon black) of hydroxypropyl methyl cellulose in 40 ml of deionized water, adjusting the pH value to 8.0-8.5, and shearing and stirring for several minutes to obtain a hydroxypropyl methyl cellulose solution;
(3) preparing a dispersing agent: mixing the sodium lauroyl sarcosinate solution obtained in the step (1) with the hydroxypropyl methyl cellulose solution obtained in the step (2), adjusting the pH value to 8.0-8.5, and continuously stirring for a plurality of minutes to obtain a dispersing agent;
(4) preparing a carbon black aqueous phase dispersion liquid: adding carbon black into the dispersing agent prepared in the step (3), continuously shearing and stirring for a plurality of minutes, and then carrying out ultrasonic treatment to obtain the special high-stability carbon black aqueous phase dispersing liquid for the fruit bag paper.
Preferably, in the step (2), the viscosity of the hydroxypropyl methyl cellulose is 6 Pa.s, the content of methoxyl is 28% -30%, and the content of hydroxypropyl is 7.0% -12%.
Preferably, the total amount of the dispersing agents sodium lauroyl sarcosinate and hydroxypropyl methylcellulose used in step (3) is 2wt.% (for absolutely dry carbon black).
Preferably, the stirring in step (3) is carried out at a shear rate of 1500 r/min.
Preferably, the equipment used in step (4) is a high-speed disperser and the shear rate is 3000 r/min.
Preferably, the carbon black aqueous dispersion liquid obtained in the step (4) has an average particle size of 240 nm.
Preferably, the clear liquid transmittance of the carbon black aqueous dispersion liquid supernatant obtained in the step (4) is 25%.
The invention has the beneficial effects that:
(1) the raw materials adopted by the invention are environment-friendly, pollution-free and wide in source, and are environment-friendly materials, so that the synthesized dispersing agent is environment-friendly and safe, the environment-friendly property of the dispersing agent is ensured from the source, and the trend requirement of modern environment protection is met.
(2) The carbon black aqueous phase dispersion liquid has low production cost and simple operation, and is suitable for industrial continuous production.
(3) According to the invention, through the steric hindrance effect formed by the adsorption layer formed by the amide of sodium lauroyl sarcosine and sodium ions adsorbed on the surface of carbon black and the macromolecular chain of hydroxypropyl methylcellulose, charge repulsion force and steric hindrance are generated, and the carbon black particles are prevented from flocculating again, so that the carbon black particles are kept in a stable suspension state, and the problem that the carbon black is difficult to disperse is solved. Sodium lauroyl sarcosine and hydroxypropyl methyl cellulose are compounded, a dispersion process is optimized, the synergistic effect of the sodium lauroyl sarcosine and the hydroxypropyl methyl cellulose is fully exerted, the uniformity of dispersion is improved, and the carbon black aqueous phase dispersion liquid with high stability is prepared.
Drawings
(1) FIG. 1 is a schematic view of a carbon black dispersion, wherein: a, no dispersant is added; b: example 1; c: example 2; d: example 3; e: example 4; f: example 5;
(2) FIG. 2 is a scanning electron micrograph of carbon black without a dispersant;
(3) FIG. 3 is a scanning electron microscope image of carbon black with dispersant added;
(4) FIG. 4 shows the clear liquid permeability of the supernatant of the carbon black dispersion under different process conditions.
Detailed Description
For further understanding of the present invention, embodiments of the present invention will be described in further detail below with reference to examples and comparative examples, but embodiments of the present invention are not limited thereto.
Example 1
(1) Preparing a sodium lauroylsarcosine solution: dissolving 0.6 wt% (to absolute dry carbon black) of sodium lauroyl sarcosinate in 40 ml of deionized water, adjusting the pH value to 8.0-8.5, and stirring at a shear speed of 1200 r/min for 15 min to obtain a sodium lauroyl sarcosinate solution;
(2) preparing a hydroxypropyl methyl cellulose solution: dissolving 1.4 wt% (to absolute dry carbon black) of hydroxypropyl methyl cellulose in 40 ml of deionized water, adjusting the pH value to 8.0-8.5, and stirring at a shear speed of 1200 r/min for 15 min to obtain a hydroxypropyl methyl cellulose solution;
(3) preparing a dispersing agent: mixing the sodium lauroyl sarcosinate solution obtained in the step (1) with the hydroxypropyl methyl cellulose solution obtained in the step (2), adjusting the pH value to 8.0-8.5, and continuously stirring for 30 min at a shearing speed of 1500r/min to obtain a dispersing agent;
(4) preparing a carbon black aqueous phase dispersion liquid: adding carbon black into the dispersing agent prepared in the step (3), continuously shearing and stirring for 60 min, and then carrying out ultrasonic treatment for 30 min to obtain the special high-stability carbon black aqueous phase dispersing liquid for the fruit bag paper.
Example 2
(1) Preparing a sodium lauroylsarcosine solution: dissolving 0.8 wt% (to absolute dry carbon black) of sodium lauroyl sarcosinate in 40 ml of deionized water, adjusting the pH value to 8.0-8.5, and stirring at a shear speed of 1200 r/min for 15 min to obtain a sodium lauroyl sarcosinate solution;
(2) preparing a hydroxypropyl methyl cellulose solution: dissolving 1.2 wt% (to absolute dry carbon black) of hydroxypropyl methyl cellulose in 40 ml of deionized water, adjusting the pH value to 8.0-8.5, and stirring at a shear speed of 1200 r/min for 15 min to obtain a hydroxypropyl methyl cellulose solution;
(3) preparing a dispersing agent: mixing the sodium lauroyl sarcosinate solution obtained in the step (1) with the hydroxypropyl methyl cellulose solution obtained in the step (2), adjusting the pH value to 8.0-8.5, and continuously stirring for 30 min at a shearing speed of 1500r/min to obtain a dispersing agent;
(4) preparing a carbon black aqueous phase dispersion liquid: adding carbon black into the dispersing agent prepared in the step (3), continuously shearing and stirring for 60 min, and then carrying out ultrasonic treatment for 30 min to obtain the special high-stability carbon black aqueous phase dispersing liquid for the fruit bag paper.
Example 3
(1) Preparing a sodium lauroylsarcosine solution: dissolving 1.0 wt% (to absolute dry carbon black) of sodium lauroyl sarcosinate in 40 ml of deionized water, adjusting the pH value to 8.0-8.5, and stirring at a shear speed of 1200 r/min for 15 min to obtain a sodium lauroyl sarcosinate solution;
(2) preparing a hydroxypropyl methyl cellulose solution: dissolving 1.0 wt% (to absolute dry carbon black) of hydroxypropyl methyl cellulose in 40 ml of deionized water, adjusting the pH value to 8.0-8.5, and stirring at a shear speed of 1200 r/min for 15 min to obtain a hydroxypropyl methyl cellulose solution;
(3) preparing a dispersing agent: mixing the sodium lauroyl sarcosinate solution obtained in the step (1) with the hydroxypropyl methyl cellulose solution obtained in the step (2), adjusting the pH value to 8.0-8.5, and continuously stirring for 30 min at a shearing speed of 1500r/min to obtain a dispersing agent;
(4) preparing a carbon black aqueous phase dispersion liquid: adding carbon black into the dispersing agent prepared in the step (3), continuously shearing and stirring for 60 min, and then carrying out ultrasonic treatment for 30 min to obtain the special high-stability carbon black aqueous phase dispersing liquid for the fruit bag paper.
Example 4
(1) Preparing a sodium lauroylsarcosine solution: dissolving 1.2 wt% (to absolute dry carbon black) of sodium lauroyl sarcosinate in 40 ml of deionized water, adjusting the pH value to 8.0-8.5, and stirring at a shear speed of 1200 r/min for 15 min to obtain a sodium lauroyl sarcosinate solution;
(2) preparing a hydroxypropyl methyl cellulose solution: dissolving 0.8 wt% (to absolute dry carbon black) of hydroxypropyl methyl cellulose in 40 ml of deionized water, adjusting the pH value to 8.0-8.5, and stirring at a shear speed of 1200 r/min for 15 min to obtain a hydroxypropyl methyl cellulose solution;
(3) preparing a dispersing agent: mixing the sodium lauroyl sarcosinate solution obtained in the step (1) with the hydroxypropyl methyl cellulose solution obtained in the step (2), adjusting the pH value to 8.0-8.5, and continuously stirring for 30 min at a shearing speed of 1500r/min to obtain a dispersing agent;
(4) preparing a carbon black aqueous phase dispersion liquid: adding carbon black into the dispersing agent prepared in the step (3), continuously shearing and stirring for 60 min, and then carrying out ultrasonic treatment for 30 min to obtain the special high-stability carbon black aqueous phase dispersing liquid for the fruit bag paper.
Example 5
(1) Preparing a sodium lauroylsarcosine solution: dissolving 1.4 wt% (to absolute dry carbon black) of sodium lauroyl sarcosinate in 40 ml of deionized water, adjusting the pH value to 8.0-8.5, and stirring at a shear speed of 1200 r/min for 15 min to obtain a sodium lauroyl sarcosinate solution;
(2) preparing a hydroxypropyl methyl cellulose solution: dissolving 0.6 wt% (to absolute dry carbon black) of hydroxypropyl methyl cellulose in 40 ml of deionized water, adjusting the pH value to 8.0-8.5, and stirring at a shear speed of 1200 r/min for 15 min to obtain a hydroxypropyl methyl cellulose solution;
(3) preparing a dispersing agent: mixing the sodium lauroyl sarcosinate solution obtained in the step (1) with the hydroxypropyl methyl cellulose solution obtained in the step (2), adjusting the pH value to 8.0-8.5, and continuously stirring for 30 min at a shearing speed of 1500r/min to obtain a dispersing agent;
(4) preparing a carbon black aqueous phase dispersion liquid: adding carbon black into the dispersing agent prepared in the step (3), continuously shearing and stirring for 60 min, and then carrying out ultrasonic treatment for 30 min to obtain the special high-stability carbon black aqueous phase dispersing liquid for the fruit bag paper.
The results of the above example are shown below:
in fig. 1, a is a carbon black dispersion without a dispersant, B is a carbon black dispersion with a complex dispersant of 0.6% sodium lauroyl sarcosinate and 1.4% hydroxypropyl methylcellulose added thereto, C is a carbon black dispersion with a complex dispersant of 0.8% sodium lauroyl sarcosinate and 1.2% hydroxypropyl methylcellulose added thereto, D is a carbon black dispersion with a complex dispersant of 1.0% sodium lauroyl sarcosinate and 1.0% hydroxypropyl methylcellulose added thereto, E is a carbon black dispersion with a complex dispersant of 1.2% sodium lauroyl sarcosinate and 0.8% hydroxypropyl methylcellulose added thereto, and F is a carbon black dispersion with a complex dispersant of 1.4% sodium lauroyl sarcosinate and 0.6% hydroxypropyl methylcellulose added thereto. As can be seen from FIG. 1, the carbon black rapidly settled at the bottom of the bottle without the dispersant added, and the layers were separated. B. C, D, E, F the addition of the dispersant made it possible to maintain the carbon black dispersion in a uniform and stable state for a long period of time without delamination. The dispersing agent can be adsorbed on the surface of the carbon black to reduce the surface energy of the carbon black, reduce the agglomeration of the carbon black and the internal friction among molecular chains, and enhance the stability of the carbon black dispersing liquid.
FIG. 2 is a scanning electron microscope image of carbon black without dispersant, and FIG. 3 is a scanning electron microscope image of carbon black with dispersant. As can be seen from fig. 2, the carbon black dispersion is dropped on the glass slide, after the deionized water is evaporated, a small part of the surface of the glass slide is exposed, and at the same time, the carbon black is observed to be agglomerated, which indicates that the carbon black dispersion without the dispersant does not achieve a good dispersion effect; fig. 3 clearly shows that the carbon black is uniformly distributed, although the particles are not uniform in size, the particles are tightly combined together, and the gap structure between the particles is basically not seen, and after the deionized water is evaporated, the carbon black is uniformly dispersed on the surface of the glass slide, which shows that the carbon black dispersion liquid added with the dispersing agent achieves good dispersing effect, and this is consistent with the analysis result of fig. 1.
FIG. 4 shows the clear liquid permeability of the supernatant of the carbon black dispersion under different process conditions. The transmittance of supernatant without dispersant is 80%, and the liquid is clear and transparent; the supernatant of example 1 had a permeability of about 70% and the liquid was in a relatively clear state; the supernatant transmittance of example 2 was about 50%, and the liquid began to assume a cloudy state; the transmittance of the supernatant liquid of the example 3 is about 38 percent, and the liquid is in a turbid state and is slightly dark; the transmittance of the supernatant of the example 4 is about 30%, and the liquid is turbid and darker; the supernatant of example 5 had a permeability of about 25%, and the solution was darker and cloudy. Compared with various performances, the dispersant in example 5 has a better formula, and the obtained carbon black aqueous phase dispersion liquid is more stable.
Claims (4)
1. A preparation method of a carbon black aqueous phase dispersion liquid special for fruit bag paper is characterized by comprising the following steps: the method comprises the following steps:
(1) preparing a sodium lauroylsarcosine solution: dissolving 0.6-1.4 wt.% of sodium lauroyl sarcosinate relative to absolutely dry carbon black in deionized water, adjusting the pH to 8.0-8.5, and shearing and stirring for several minutes to obtain a sodium lauroyl sarcosinate solution;
(2) preparing a hydroxypropyl methyl cellulose solution: dissolving 0.6-1.4 wt.% of hydroxypropyl methyl cellulose relative to absolutely dry carbon black in deionized water, adjusting the pH to 8.0-8.5, and shearing and stirring for several minutes to obtain a hydroxypropyl methyl cellulose solution;
(3) preparing a dispersing agent: mixing the sodium lauroyl sarcosinate solution obtained in the step (1) with the hydroxypropyl methyl cellulose solution obtained in the step (2), adjusting the pH value to 8.0-8.5, and continuously stirring for a plurality of minutes to obtain a dispersing agent;
(4) preparing a carbon black aqueous phase dispersion liquid: adding carbon black into the dispersing agent prepared in the step (3), continuously shearing and stirring for a plurality of minutes, and then carrying out ultrasonic treatment to obtain the special high-stability carbon black aqueous phase dispersing liquid for the fruit bag paper;
in the step (3), the total usage amount of sodium lauroyl sarcosinate and hydroxypropyl methylcellulose in the dispersing agent is 2wt.% relative to absolutely dry carbon black;
the average particle size of the carbon black aqueous phase dispersion liquid finally obtained in the step (4) is 240 nm;
and (4) the transmittance of the supernatant of the carbon black aqueous phase dispersion liquid finally obtained in the step (4) is 25%.
2. The method for preparing the carbon black aqueous dispersion liquid special for fruit bag cultivating paper as claimed in claim 1, wherein the method comprises the following steps: in the step (2), the viscosity of the hydroxypropyl methyl cellulose is 6 Pa.s, the content of the methoxyl is 28-30%, and the content of the hydroxypropyl is 7.0-12%.
3. The method for preparing the carbon black aqueous dispersion liquid special for fruit bag cultivating paper as claimed in claim 1, wherein the method comprises the following steps: the stirring in step (3) is carried out at a shear rate of 1500 r/min.
4. The method for preparing the carbon black aqueous dispersion liquid special for fruit bag cultivating paper as claimed in claim 1, wherein the method comprises the following steps: the equipment used in the step (4) is a high-speed dispersion machine, and the shearing speed is 3000 r/min.
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