Hezhen Hydrophilic And Hydrophobic Rubbe

Product Introduction

White carbon black is a general term for white powdered X-ray amorphous silicic acid and silicate products. The following is a comprehensive overview of white carbon black, including its definition, properties, production methods, applications, and market trends.

1. Definition and Chemical Composition

Definition: White carbon black, chemically known as silica (SiO₂), is a white, non-toxic, amorphous powder that serves as a highly dispersed nanoscale nonmetallic material. It is named for its white appearance and can be used as an effective substitute for carbon black in various applications.

Chemical Composition: White carbon black is a porous substance with a composition expressed as SiO₂·nH₂O, where nH₂O exists in the form of surface hydroxyl groups. This structure contributes to its unique properties.

2. Physical and Chemical Properties

Physical Properties: Silica crystal is a hard, brittle, non-conductive, refractory material (melting point 1710℃) that is insoluble in water and appears as a colorless solid. Its apparent density is 0.128 g/cm³.

Chemical Properties: Silica is the anhydride of silicic acid and does not react with water to form silicic acid. Due to strong silicon-oxygen bonds, its chemical properties are highly stable. At high temperatures, it can react with basic oxides, alkalis, soda ash, and similar substances to form silicates. White carbon black does not react with common acids, demonstrating good acid resistance, but can be corroded by hydrofluoric acid.

3. Production Methods

Precipitation Method: Sodium silicate solution reacts with acid to form silica colloid, which is then dried and sintered to produce white carbon black. This includes traditional precipitation methods using sulfuric acid, hydrochloric acid, or CO₂ with water glass as raw materials, as well as special methods like supergravity technology, sol-gel, chemical crystallization, secondary crystallization, and reversed-phase micelle microemulsion.

Vapor Phase Method: Silane or siloxane is decomposed at high temperatures to generate silicon nanoparticles, which are collected and dried to yield white carbon black. Fumed white carbon black is entirely nano-silica with purity reaching 99% and particle sizes of 10-20 nm, though the process is complex and costly.

4. Application Fields

Rubber Industry: As a rubber reinforcing agent, it is the largest downstream application, accounting for over 75% of total usage. It enhances rubber strength, wear resistance, aging resistance, and other properties.

Coating Industry: Used to formulate high-performance coatings that improve adhesion, hardness, wear resistance, and other characteristics.

Plastics Industry: Acts as a plastic filler to improve strength, wear resistance, aging resistance, and other properties.

Catalyst Carrier: With a large specific surface area and high activity, it serves as a catalyst carrier to enhance catalyst performance.

Environmental Protection: Used as an adsorbent to effectively remove harmful substances from water, and also in photocatalytic reactions to degrade air and water pollutants.

Biomedical Applications: Exhibiting excellent biocompatibility, it is used to prepare biomedical materials such as scaffolds, bone replacement materials, and drug carriers.

Food Processing: As a food additive, it improves the taste and stability of food products.

Paper Industry: Enhances paper whiteness, smoothness, and gloss, while improving printing performance.

Ink Industry: Boosts the hiding power, adhesion, and stability of inks, enhancing printing performance.

Cosmetics Industry: Improves fineness, stability, and user experience of cosmetics, while regulating skin oil secretion and enhancing skin quality.

Pharmaceutical Industry: Used in pharmaceutical preparations to improve drug dispersion, stability, and bioavailability, while reducing side effects.

5. Market Trends

With the recovery of market demand and the restoration of pricing systems, the market size of precipitated white carbon black in China has returned to an upward trend, with expectations of sustained growth.

Highly dispersed white carbon black manufacturers with strong research and development capabilities and leading products are seeing expanded market sales. In the carbon black industry, brand awareness and reputation remain key competitive factors for manufacturers.