This technology is a manufacturing method for synthesizing 513MHSH, a basic magnesium sulfate fiber, by refluxing MgSO4·7H2O and MgO as starting materials in a mixed solvent of water and ethylene glycol at approximately 120°C. The resulting fibers can be used as a reinforcing agent in polypropylene to create fiber-reinforced polymer composites.
While 513MHSH is used as an inorganic fiber reinforcement to replace asbestos, the industry has largely relied on expensive Japanese imports, and domestic synthesis has been limited to high-temperature, high-pressure hydrothermal methods exceeding 170°C. Conventional reflux methods using only water are hindered by boiling point limitations, resulting in long reaction times, the need for excess MgSO4·7H2O, and short fiber lengths of only about 5㎛, which limits the improvement of polymer properties.
This technology uses a polyol solvent with a boiling point above 100°C to stably supply higher energy to the reaction system, achieving a yield of over 90% and fiber lengths of 25–30㎛ within 6 hours, even at a 1:1 molar ratio of starting materials. Incorporating these fibers can increase the elastic modulus and flexural modulus of pure polypropylene by approximately 18%. It can be applied to polymer fillers for automotive parts, flame retardants, and fireproof building materials, allowing for the replacement of imported inorganic fibers with low-cost domestic materials.
This invention was developed with support from the Small and Medium Business Administration for the development and improvement of synthesis processes for eco-friendly new inorganic fibers.
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