Silica sol specifically for papermaking

#Application ·2025-08-21 17:00:09

I. Core Features

• The particle size is controllable and the dispersibility is excellent
  The particle size is usually within the range of 5 to 100 nanometers and can be precisely regulated according to the type of paper (such as cultural paper, packaging paper, specialty paper, etc.). Nanoparticles can be uniformly dispersed in pulp or coatings, preventing agglomeration and ensuring the stability of paper performance.
• High specific surface area and surface activity
  The surface of silica particles is rich in hydroxyl groups (-OH), with a specific surface area of up to 100-300 m²/g. It has strong adsorption and reactivity, and can form stable bonds with pulp fibers, additives, etc.
• Good chemical stability
  It is resistant to acid and alkali (specific models), and is not easily decomposed in the pH value fluctuations during the papermaking process (such as acidic papermaking and neutral papermaking). It has excellent compatibility with starch, sizing agents, fillers, etc.
• It has excellent film-forming properties
  After the water evaporates, the silica sol particles can form a continuous and dense silica film, enhancing the physical properties and surface characteristics of the paper.

Ii. Main Roles in Papermaking

1. Enhance the strength of paper
   • It is combined with pulp fibers through hydrogen bonds or chemical bonds, filling the gaps between the fibers and enhancing the tensile strength, bursting strength and tear strength of the paper, especially suitable for low basis weight paper (such as thin sheet paper).
   • As a wet-end additive, it can reduce fiber loss and improve the uniformity of paper sheet formation.
2. Improve the surface properties of paper
   • In coating processing, silica sol can be used as a pigment or binder for coatings, filling the tiny concavities and convexities on the coating surface, making the paper surface smoother and improving printability (such as uniform ink absorption and print clarity).
   • It enhances the gloss and whiteness of paper, improves the visual texture, and is suitable for high-end cultural paper, coated paper, etc.
3. Improve the water resistance and anti-aging properties of paper
   • The formed silicon oxide film can prevent water penetration. When used in combination with sizing agents, it can significantly enhance the water resistance of paper (such as the moisture-proof property of packaging paper).
   • The chemical inertness of silicon dioxide can enhance the anti-ultraviolet aging ability of paper and extend its preservation time (such as archive paper and book paper).
4. Adjust the air permeability and ink absorption of the paper
   • By controlling the addition amount and particle size of silica sol, the pore structure of the paper can be adjusted to balance its air permeability (such as filter paper) and ink absorbency (such as printing paper), avoiding problems such as pass-through or slow ink drying.

Iii. Application Fields

• Cultural paper: such as newsprint, writing paper, and coated paper, enhances strength, printing performance and whiteness.
• Packaging paper: such as kraft paper, boxboard paper, with enhanced burst resistance, water resistance and moisture resistance.
• Specialty paper: such as filter paper, release paper, decorative paper, for adjusting air permeability, surface smoothness or weather resistance.
• Cardboard: such as corrugated cardboard and hard cardboard, to enhance the interlayer bonding strength and compressive strength.

Iv. Advantages of Use