Silica Dioxide 7631-86-9 For Coil Paint

Due to this special physical and chemical structure, ordinary silica particles are prone to a large number of surface adsorbed water molecules,

secondary aggregation between molecules, and excessive specific surface area when forming aggregates, which affects the effect of its industrial

application. Specifically,it is manifested as follows:

(1) Hydrophilic surface: Since the surface of silica aggregates contains a large number of polar hydroxyl groups, it will have a strong adsorption effect

on external water molecules, causing a large number of water molecules to be adsorbed on its surface. During the processing of rubber products, a

large number of water molecules adsorbed on the surface of silica particles will cause bubbles and voids in the mixed rubber during vulcanization,

thereby affecting the performance of the colloid. At the same time, the surface of rubber products is generally not polar, while the surface of silica

contains a large number of polar hydroxyl groups, resulting in poor compatibility between the two, thus affecting the reinforcing effect of silica.

(2) Poor dispersibilit: The structure of silica is a chain-like aggregate. Ordinary silica produced by precipitation method is prone to secondary aggregation

when forming aggregates and the structure is not easily destroyed. Compared with silica particles prepared by the gas phase method, ordinary silica

particles produced by the precipitation method often cross-link into a whole when aggregated, resulting in poor dispersibility of silica particles. When used

as an industrial reinforcing agent, poor dispersibility is not conducive to the combination of silica and the reinforcing matrix, which will reduce its reinforcing

effect.

(3) Excessive specific surface area: Silica particles have a small particle size and a large specific surface area. Although a large specific surface area usually

plays a promoting role in the rubber reinforcement process, an excessively large specific surface area will enhance the cohesive force between silica particles,

resulting in it being difficult to disperse in the rubber matrix, and it is easy to adsorb a large amount of accelerators, delay vulcanization time, generate excessive

heat, and burn the matrix during the processing of rubber products.

Therefore, silica mostly needs to be modified before industrial application to improve its industrial application performance.

Tips: 

* Before you use it, please test and make sure the dosage before using according different formulations and conditions.

* Recommended dosage is 3% -5%.

              Anticorrosion Pigments, Inkjet Receptive Coating, Matting Agent