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2022-02-19
Precipitated silica is a high-tech inorganic fine chemical product.
White carbon black, also known as silica, is scientifically termed precipitated hydrated silica. It is a high‑tech inorganic fine chemical product whose main constituent is SiO₂. Its physical properties resemble those of carbon black, appearing as a highly dispersed white amorphous powder or flocculent powder; it is also processed into granular forms for commercial use. Lightweight, with an original particle size below 0.3 μm and a relative density ranging from 2.319 to 2.653, it has a melting point of 1750°C. It is insoluble in water and most acids, but absorbs moisture from the air, forming hygroscopic fine particles. It is soluble in caustic soda and hydrofluoric acid, while remaining inert to other chemicals; it does not decompose at high temperatures nor does it burn. It is chemically inert toward substrates, active ingredients, and additives, and exhibits excellent compatibility with many active components commonly used in vitamins, hormones, fluorides, antibiotics, enzyme preparations, and cosmetics. It possesses high electrical insulation properties. Owing to its porosity and large specific surface area, it demonstrates strong dispersibility in raw rubber and imparts superior reinforcing performance in rubber compounds. Surface‑modified hydrophobic silica readily disperses in oils, rubbers, and plastics as a reinforcing filler, significantly enhancing mechanical strength and tear resistance. Due to variations in manufacturing processes, the physical and chemical characteristics, as well as the microstructure, of silica may differ, leading to distinct application areas and performance outcomes.
Do you know the types and properties of silicon dioxide?
The reinforcing fillers used in silicone rubber are primarily synthetic silica, also known as precipitated silica. Precipitated silica is classified into fumed silica and precipitated silica.
What method is used for the high-temperature surface treatment of precipitated silica?
Surface high‑temperature treatment involves subjecting precipitated silica to elevated temperatures to remove adsorbed molecules—such as water and other low‑molecular‑weight species—from its surface. While this approach can modestly improve certain vulcanization properties, the effect is not particularly pronounced. Surface chemical treatment, on the other hand, entails reacting the active silanol groups on the silica surface with specific chemical reagents, thereby enhancing the compatibility and reactive activity of the silica with polymeric matrices. A wide variety of reagents can be employed for such chemical modification, and numerous methods exist; a substantial body of literature and patents addresses these approaches. The following provides a brief overview of some key aspects.
Challenges Facing the Future Development of the International Rubber Industry
On May 26, the 18th Shanghai Derivatives Market Forum, hosted by the Shanghai Futures Exchange, opened at the Shanghai Futures Building. At the forum’s rubber-themed roundtable held that afternoon, participants engaged in an in-depth discussion on several challenges currently facing the international rubber market.
The 2021 recovery in global rubber demand is expected to fall short of expectations.
Salvatore Pinizzotto, Secretary-General of the International Rubber Study Group (IRSG), stated that although demand for rubber in Asia, particularly in China, is growing robustly, the recovery of global rubber market demand in 2021 is expected to fall short of expectations, given the potential delay in the large-scale rollout of vaccines.
Is the day of Black’s rise also the day of rubber’s plunge?
Currently, policy measures are clearly weighing on commodity markets, with black metals showing the most pronounced weakness; prices in this sector have already fallen by more than 20% from their peak. Some individual commodities are beginning to show signs of stabilization.
2022-01-14
What are the six key factors in silicone rubber compression molding and vulcanization?
1. Molding temperature: When the formulation is fixed, temperature is the key factor determining whether vulcanization proceeds properly. If the temperature is too low, the rubber compound will not react; if it is too high, the product becomes brittle and deformed. Typically, below 170°C, the vulcanization rate is slow, requiring longer curing times. Above 180°C, vulcanization occurs very rapidly, yielding a high production rate, but the mold often becomes fouled, the surface develops a glossy sheen, the product may warp, dimensions shrink, wall thickness exceeds specifications, and flash becomes brittle.
What exactly makes liquid silicone so appealing?
Liquid silicone rubber, abbreviated as LSR in English, is used to manufacture silicone products such as silicone nipples and baby bottles, phone cases, and gas‑tight respirators—some of the most popular and best‑selling LSR items. LSR is highly favored by both consumers and manufacturers. So what exactly accounts for its widespread appeal?
How to choose the right silicone vulcanizing agent?
Silicone vulcanizing agents currently include bis‑dibutyltin dilaurate, bis‑dipentyltin dilaurate, platinum‑based catalysts, and several others. How do you choose the right vulcanizing agent? Below, we’ll provide a detailed explanation.
How should impurities and black spots on the surface of a silicone tube be handled?
1. Causes of impurities and black spots on the surface of silicone tubing: 1. Raw material defects: Approximately 20% of black spots in silicone tubes or strips during production originate from black‑spot impurities present in the raw materials. 2. Excessive black spots due to secondary mixing: When compounded rubber is stored for extended periods, the curing agent may lose its effectiveness. In such cases, the compound must be reprocessed and the curing agent replenished; however, black‑spot impurities can still arise during this secondary mixing step. 3. Issues arising from molding operations: During production, if the machine’s venting stroke is excessively long, black‑spot impurities may be drawn into the mold during venting.
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