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CN-121975346-A - Black masterbatch and preparation method and application thereof

CN121975346ACN 121975346 ACN121975346 ACN 121975346ACN-121975346-A

Abstract

The invention discloses a black masterbatch and a preparation method and application thereof. The black masterbatch composition comprises, by mass, 50-85 parts of a liquid crystal polymer, 15-40 parts of carbon black, and 0.1-1 part of nano silicon dioxide, wherein the ratio of the average primary particle size of the carbon black to the average primary particle size of the nano silicon dioxide is (3-8): 1. In the black matrix composition, the nano silicon dioxide can improve the viscosity of a system, promote the transmission of shearing force, effectively disperse and adsorb the nano silicon dioxide on the surface of carbon black to form a three-dimensional network structure when the average primary particle diameter of the nano silicon dioxide is smaller than that of the carbon black, reduce the cohesion of the carbon black, improve the dispersibility of the carbon black, reduce the size of carbon black aggregates and reduce the number of the aggregates, so that the carbon black aggregates form a conductive path in matrix resin to reduce the resistivity of the carbon black aggregates, and meanwhile, the high-temperature-resistant performance of the carbon black aggregates is also suitable for a resin material system needing high-temperature processing.

Inventors

  • WANG YINGHUI
  • DING CHAO
  • TANG LEI
  • ZENG SAI

Assignees

  • 金发科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260115

Claims (10)

  1. 1. The black masterbatch composition is characterized by comprising the following components in parts by mass: 50-85 parts of liquid crystal polymer; 15-40 parts of carbon black; 0.1-1 part of nano silicon dioxide; The ratio of the average primary particle diameter of the carbon black to the nano silicon dioxide is (3-8): 1.
  2. 2. The black matrix composition according to claim 1, wherein the melting point of the liquid crystal polymer is 250 to 400 ℃.
  3. 3. The black matrix composition according to claim 1, wherein the average primary particle diameter of the carbon black is 10 to 100nm.
  4. 4. The black matrix composition according to claim 1, wherein the nanosilica has an average primary particle diameter of 2 to 40nm.
  5. 5. The black matrix composition according to claim 1, wherein the nanosilica comprises hydrophobic nanosilica.
  6. 6. The black matrix composition according to claim 1, further comprising an auxiliary agent, wherein the auxiliary agent is 0-2 parts by mass, and preferably the auxiliary agent comprises at least one of an antioxidant, an ultraviolet light absorber, an antistatic agent, a light stabilizer, and a lubricant.
  7. 7. A process for producing a black matrix composition according to any one of claims 1 to 6, comprising the steps of: premixing carbon black and nano silicon dioxide, mixing with the rest components, extruding and granulating to obtain the black masterbatch composition.
  8. 8. The method of producing a black matrix composition according to claim 7, wherein the extrusion temperature is 320 to 360 ℃.
  9. 9. A liquid crystal polymer comprising a liquid crystal polymer resin, a filler, and the black matrix composition according to any one of claims 1 to 6.
  10. 10. A method for producing a liquid crystal polymer according to claim 9, comprising the step of mixing the components and extruding and granulating the mixture to produce the liquid crystal polymer, wherein the extrusion temperature is preferably 320-360 ℃.

Description

Black masterbatch and preparation method and application thereof Technical Field The invention relates to the technical field of materials, in particular to a black masterbatch, a preparation method and application thereof. Background Carbon blacks such as carbon blacks are widely used for preparing conductive polymer composites because of their excellent conductivity and colorability. However, carbon black particles are prone to agglomeration, resulting in uneven dispersion in the matrix, affecting the conductive properties. Traditional dispersants such as polyethylene waxes are susceptible to decomposition at high temperature processing, such as LCP (Liquid Crystal Polymer ) processing temperatures of ≡300 ℃ and high additions (typically > 2%), adding cost and potentially deteriorating mechanical properties of the material. For example, the related art prepares the colored sand by carbon black, silicon dioxide, lubricant, dispersant, maleic anhydride copolymer, initiator and organic solvent, so that the carbon black adheres to the surface of the silicon dioxide, thereby reducing the acting force between the carbon black, reducing the agglomeration of the carbon black and improving the dispersibility of the carbon black, but the used dispersant has low temperature resistance and cannot be used for high-temperature processing. Disclosure of Invention The present invention aims to solve at least one of the above technical problems in the prior art. To this end, the invention aims to provide a black matrix, and a preparation method and application thereof. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: In a first aspect of the present invention, there is provided a black matrix composition comprising the following components in parts by mass: 50-85 parts of liquid crystal polymer; 15-40 parts of carbon black; 0.1-1 part of nano silicon dioxide; The ratio of the average primary particle diameter of the carbon black to the nano silicon dioxide is (3-8): 1. The nano silicon dioxide has high specific surface area, high temperature resistance and excellent dispersion performance, can inhibit carbon black agglomeration through the steric effect of a physical adsorbent, can improve the viscosity of a system, promote the transmission of shear force, can effectively disperse and adsorb on the surface of carbon black to form a three-dimensional network structure when the average primary particle size of the nano silicon dioxide is smaller than that of the carbon black, and reduces the cohesive force of the carbon black, thereby improving the dispersibility of the carbon black, reducing the size of carbon black agglomerates and reducing the number of the agglomerates to form a conductive path in matrix resin, thereby reducing the resistivity of the carbon black agglomerates, and simultaneously, the high temperature resistance of the carbon black is also suitable for a resin material system needing high-temperature processing. In some embodiments, the melting point of the liquid crystal polymer is 250-400 ℃, such as 250 ℃, 280 ℃, 300 ℃, 350 ℃, 380 ℃, 400 ℃ and the like, according to the differential scanning calorimeter DSC method, the melting point is raised to the highest temperature of melting point+ (20-80) DEG C at the temperature rising rate of 20 ℃ per minute from room temperature, the temperature is kept for 2min and then is reduced to room temperature at the rate of 20 ℃ per minute, the temperature of the test sample is raised to the highest temperature of melting point+ (20-80) DEGC at the temperature rising rate of 20 ℃ per minute again after being kept for 2min at room temperature, the second melting curve of the test is obtained, and the melting peak is selected as the melting point. In some embodiments, the type of the liquid crystal polymer is not particularly limited, such as an aromatic polyester and/or an aromatic polyester amide. In addition, polyesters comprising partially aromatic polyesters and/or aromatic polyester amides in the same molecular chain are also within this range. In some embodiments, the liquid crystal polymer includes an aromatic polyester or an aromatic polyester amide having 1 or more than 2 kinds of repeating units derived from an aromatic hydroxycarboxylic acid and its derivative as constituent components. More specifically, there may be mentioned: (1) Polyesters mainly comprising 1 or more than 2 kinds of repeating units derived from aromatic hydroxycarboxylic acids and derivatives thereof; (2) A polyester mainly comprising (a) 1 or more than 2 kinds of repeating units derived from an aromatic hydroxycarboxylic acid and a derivative thereof, and (b) 1 or more than 2 kinds of repeating units derived from an aromatic dicarboxylic acid, an alicyclic dicarboxylic acid, and a derivative thereof; (3) A polyester mainly comprising (a) 1 or 2 or more repeating units derived from an aromatic hydroxycarboxylic acid and a derivative ther