In the production process of SMC (sheet molding compound), thickeners play an indispensable role. This special additive can transform the SMC with low viscosity and easy glass fiber impregnation into a high viscosity and non-sticky form, thus meeting the subsequent processing requirements. Among them, active magnesium oxide is a commonly used thickener. Although the dosage is small, its effect is extremely significant. Each manufacturer will adjust the addition ratio according to the different uses of the product, but generally speaking, the stability of the activity value of active magnesium oxide is crucial to ensure product quality.
SMC composite material, the full name of which is Sheet Molding Compound, its main raw materials include GF (special yarn), UP (unsaturated resin), low shrinkage additives, MD (filler) and various additives. This material has many advantages, such as waterproof and moisture-proof, high specific strength, good toughness, not easy to deform, and its service life can theoretically be up to more than 30 years. Its regular size and appearance, small deformation coefficient, and easy mass production make SMC an ideal choice for automotive parts, train interior parts, building formwork, water tanks, electrical parts, and sanitary parts.
It is worth mentioning that SMC composite materials, with their unique performance advantages, effectively solve the problems of easy aging, easy corrosion, poor insulation, poor cold resistance, poor flame retardancy and short life of traditional wooden, steel and plastic meter boxes. The composite meter box not only has excellent sealing, waterproof and corrosion resistance, but also has anti-theft function, does not require grounding wire, has beautiful appearance, and is equipped with locks and lead seals for safety protection. Therefore, composite cable brackets, cable trench brackets, composite meter boxes and other products have been widely used in rural and urban network transformation.
In the production of SMC, magnesium oxide is one of the commonly used thickeners, and its purpose is to quickly achieve thickening effect. Generally, the higher the content of magnesium oxide, the better the thickening effect, especially active magnesium oxide, which is the first choice. These thickeners are usually added to the kneader together with the filler powder during the production process. The recommended thickener dosage is 1.0-1.2phr. However, it is worth noting that during the plum rain season, due to the high humidity, filler powder, glass fiber surface and Ca(OH)2 powder are easy to absorb moisture, which may seriously affect the thickening effect. Therefore, it is necessary to prevent and control the influence of humidity.
Messi Biology‘s active magnesium oxide has become a high-quality SMC composite material additive with its high content, optional activity value and stable product quality, providing strong support for the production of SMC.