The reinforcing filler used in silicone rubber mainly refers to synthetic silica, also known as silica. Silica is divided into fumed silica and precipitated silica.

Surface high temperature treatment is to perform high temperature heat treatment on the precipitated silica to remove some molecules adsorbed on the surface of silica, namely water and other low molecular weight adsorbates. As a result of this, partial vulcanization characteristics can be improved, but the effect is not significant. Surface chemical treatment is to use some chemical reagents to react with the surface active silanol groups of silica to improve the affinity and reactivity of silica and polymer compounds. There are many reagents that can chemically treat the surface of silica, and there are various methods for chemical treatment. There are many literatures and patents on this aspect. The following is a brief introduction.

On May 26, the 18th Shanghai Derivatives Market Forum hosted by Shanghai Futures Exchange opened in Shanghai Futures Building. In the round table forum of Shangyan Rubber (11365, -50.00, -0.44%) Forum held in the afternoon of the same day, the guests had in-depth discussions on some issues facing the current international rubber market.

Salvatore Pinizzotto, secretary-general of the International Rubber Research Group (IRSG), said that despite the strong growth in demand for rubber in Asia, especially China, the recovery of demand in the international rubber market in 2021 is expected to be lower than expected due to possible delays in the large-scale promotion of vaccines.

The current policy has obviously suppressed commodities, especially ferrous metals, which have fallen by more than 20% from the highest point. Some varieties have shown signs of stabilizing.

Molding temperature: When the formula is fixed, the temperature is the basis for vulcanization. If the temperature is not enough, the rubber compound will not react. If the temperature is too high, the product will be brittle and deformed. Usually lower than 170 degrees, the vulcanization speed is slow and the time must be extended. ; The temperature is higher than 180 degrees, the vulcanization speed is very fast, and the output is high, but it is easy to be dirty, shiny, the product is deformed, the size becomes smaller, the thickness of the thin film exceeds the standard, and the burr becomes brittle.

Liquid silicone, referred to as LSR in English, is used to make silicone products, such as silicone pacifiers, baby bottles, mobile phone cases, and gas masks, which are some of the most popular and popular liquid silicone products. Liquid silicone is favored by consumers and manufacturers. Why is it so attractive.

At present, there are several kinds of silicone vulcanizing agents: double two-four curing agent, double two-penta curing agent, platinum curing agent and so on. How to choose the right vulcanizing agent? Below is a detailed explanation for you

Reasons for impurities and black spots on the surface of the silicone tube: