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CN-121991534-A - Preparation method of carbon black dispersion with coffee grounds synergistically modified, carbon black dispersion with coffee grounds synergistically modified and application of carbon black dispersion

CN121991534ACN 121991534 ACN121991534 ACN 121991534ACN-121991534-A

Abstract

The invention relates to the technical field of functional nano composite materials, and discloses a preparation method of a carbon black dispersion with coffee grounds synergistically modified, the carbon black dispersion with the coffee grounds synergistically modified and application thereof. The method comprises the steps of mixing carbon black, coffee grounds, a nonionic surfactant, hydrogen peroxide, ethanol and water, adjusting the pH value to be first alkaline, mechanically shearing to obtain an oxidized carbon black dispersion, reacting ferrous chloride, ferric chloride and the oxidized carbon black dispersion under the second alkaline to obtain a carbon black dispersion modified in situ by Fe 3 O 4 , and mixing waterborne polyurethane with the carbon black dispersion modified in situ by Fe 3 O 4 . The coffee grounds are added in the preparation process of the carbon black dispersion, the dissolution concentration of the effective pigment in water can be greatly improved by grinding the coffee grounds in a strong alkali environment, the coloring depth and the ultraviolet absorption capacity of the carbon black are improved, the Fe 3 O 4 is tightly contacted with the carbon black, so that the efficient absorption type electromagnetic shielding is realized, and the dispersion has high stability.

Inventors

  • AI LI
  • Jia Kangqu
  • WANG ZIFEI
  • HUANG ZAIXING
  • XIE YUNFENG
  • DU GUOHAI

Assignees

  • 武汉纺织大学
  • 福建省向兴纺织科技有限公司

Dates

Publication Date
20260508
Application Date
20251223

Claims (10)

  1. 1. A method for preparing a carbon black dispersion synergistically modified with coffee grounds, comprising the steps of: (1) Mixing carbon black, coffee grounds, a nonionic surfactant, hydrogen peroxide, ethanol and water to obtain a mixed solution, adjusting the pH value of the mixed solution to be first alkaline, and mechanically shearing to obtain an oxidized carbon black dispersion; (2) Reacting ferrous chloride, ferric chloride and oxidized carbon black dispersoid under inert atmosphere and second alkaline condition to obtain carbon black dispersoid modified in situ by Fe 3 O 4 ; (3) And mixing the aqueous polyurethane with the carbon black dispersion modified in situ by Fe 3 O 4 to obtain the modified carbon black dispersion.
  2. 2. The method according to claim 1, wherein the carbon black is used in an amount of 12 to 16 mass%, the coffee grounds is used in an amount of 5 to 10 mass%, the nonionic surfactant is used in an amount of 1 to 2 mass%, the hydrogen peroxide is used in an amount of 3 to 5 mass%, the ethanol is used in an amount of 2 to 5 mass%, the ferrous chloride is used in an amount of 3 to 5 mass%, the ferric chloride is used in an amount of 9 to 11 mass%, the aqueous polyurethane is used in an amount of 2 to 3 mass%, and the water is the balance, based on 100 mass% of the total weight of carbon black, coffee grounds, nonionic surfactant, hydrogen peroxide, ethanol, ferrous chloride, ferric chloride, aqueous polyurethane and water.
  3. 3. The method according to claim 1 or 2, wherein the nonionic surfactant is a combination of isomeric tridecyl alcohol polyoxyethylene ethers and styryl phenol polyoxyethylene ethers; preferably, the weight ratio of the usage amount of the isomeric tridecanol polyoxyethylene ether to the styrylphenol polyoxyethylene ether is 1 (0.5-2).
  4. 4. The method according to claim 2, characterized in that the molar ratio of ferrous chloride to ferric chloride is 1 (1.5-2.5), preferably 1:2, wherein the ferrous chloride is calculated as Fe 2+ and the ferric chloride is calculated as Fe 3+ .
  5. 5. The method according to any one of claims 1 to 4, wherein in step (1), the pH of the mixed liquor is adjusted to a first alkalinity using an alkaline solution; and/or, in step (1), the first alkaline pH is 10 to 10.5; And/or in the step (1), the conditions of mechanical shearing comprise a shearing rate of 1200-2500r/min, a temperature of 10-40 ℃ and a time of 1-2 hours.
  6. 6. The method according to any one of claims 1 to 5, wherein in step (2), the second alkaline pH is 10 to 10.5; And/or in step (2), the reaction conditions include a temperature of 10-40 ℃ for 1-2 hours; And/or, in step (3), the mixing conditions include a temperature of 10-40 ℃ for 0.5-2 hours.
  7. 7. A carbon black dispersion synergistically modified with coffee grounds prepared by the process of any one of claims 1-6.
  8. 8. Use of the coffee grounds co-modified carbon black dispersion of claim 7 in the preparation of a multifunctional textile.
  9. 9. A functional textile fabric, characterized in that the process for the preparation of the functional textile fabric comprises: A textile fabric is immersed in the coffee grounds co-modified carbon black dispersion of claim 8, and then dried and baked.
  10. 10. The functional textile fabric according to claim 9, wherein said padding conditions include a concentration of modified carbon black of 0.5-20%, a padding ratio of 75-85%, and a temperature of 10-40 ℃; And/or the baking condition comprises 130-160 ℃ and 0.5-5min.

Description

Preparation method of carbon black dispersion with coffee grounds synergistically modified, carbon black dispersion with coffee grounds synergistically modified and application of carbon black dispersion Technical Field The invention relates to the technical field of functional nano composite materials, in particular to a preparation method of a carbon black dispersion with coffee grounds synergistically modified, the carbon black dispersion with the coffee grounds synergistically modified and application thereof. Background Carbon black is used as an important functional nano material and has wide application in the fields of conduction, coloring, ultraviolet shielding, electromagnetic shielding and the like. However, carbon black particles have large specific surface area and high surface energy, are extremely easy to agglomerate, and have poor dispersion stability in a liquid medium, so that the application performance of the carbon black particles is severely restricted. Therefore, the dispersion stability and performance of carbon black are often improved by physical modification and chemical modification. Such as stabilizing carbon black particles by physical adsorption or steric hindrance using surfactants (e.g., anionic sulfonates, nonionic PEG-like) or polymers (e.g., polyvinylpyrrolidone PVP). The method can be used for deagglomerating and possibly introducing a small amount of defects under the action of mechanical force by means of high-speed shearing, ball milling and the like, and can be used for mechanical fusion with other particles. The most classical is oxidation modification, and strong oxidants (such as concentrated nitric acid, hydrogen peroxide, ozone and potassium permanganate) are used for introducing oxygen-containing functional groups such as carboxyl (-COOH), hydroxyl (-OH), carbonyl (C=O) and the like on the surface of carbon black, so that the hydrophilicity and the dispersibility of the carbon black and the reactivity with other polar substances can be obviously enhanced. There are also active groups on the surface of carbon black, such as polymethyl methacrylate, aqueous polyurethane, to modify the surface properties of carbon black and improve compatibility with the polymer matrix. Or carrying Ag, siO 2、TiO2, fe 3O4 and other nano particles on the surface of the carbon black by in-situ precipitation or adsorption, and endowing the carbon black with new functions of antibiosis, catalysis, magnetism and the like. Fe 3O4 is a ferrimagnetic material whose unique tetrahedral and octahedral lattice structure allows electrons to migrate rapidly between Fe 2+ and Fe 3+, creating a powerful magnetic dipole. When electromagnetic waves are incident, hysteresis loss and eddy current loss occur in the dipoles, and the electromagnetic energy is converted into heat energy, so that the magnetic loss type shielding is realized. Carbon black is an excellent electrically lossy shielding material whose conductive network attenuates electromagnetic waves by reflection and multiple reflection mechanisms. By adopting the technology, the modified carbon black can still be agglomerated again in long-term storage or different environments (such as pH and salinity change), and the long-term stability of the dispersion is a great difficulty in industrialization. In particular, to obtain an excellent magnetic loss type shielding effect, a high total iron content ensures that a sufficient amount of Fe 3O4 is produced, and thus, an excellent dispersion stability of carbon black is required to support Fe 3O4. In addition, many chemical modification methods involve strong acid, strong alkali, high temperature and high pressure, have high requirements on equipment, produce wastewater after post treatment, have large process pollution, have large environmental protection pressure and have high cost. Excessive oxidation, in turn, may destroy the intrinsic sp2 carbon structure of the carbon black, resulting in a decrease in conductivity thereof. In addition, single carbon black materials have functional limitations, for example, as a coloring for textile use, the color depth is insufficient. As another example, as an electromagnetic shielding function for textile, the electromagnetic shielding mechanism is mainly reflection, which is easy to cause secondary electromagnetic pollution. In the prior art, carbon black or various modified carbon blacks, which are used as colorants and functional materials (such as ultraviolet resistance function, electromagnetic shielding function and the like), have some defects in textile application, such as insufficient color depth, and the color depth is not linearly increased with the increase of the carbon black dosage. As another example, it is difficult to meet the multi-functional needs of multiple varieties of textiles, limiting their application in textiles. This is because, in the padding of textiles, the modified carbon black is diluted, which tends to cause instability