Liquid Acrylic Syrup Viscosity Control for Fiber Impregnation

The patent applies parameter changes by modifying the viscosity of the (meth)acrylic syrup through specific formulation adjustments. The syrup viscosity is controlled to fall within the range of 10 to 10,000 mPa·s at 25°C, which is lower than conventional viscous syrups. This viscosity reduction enables complete and correct impregnation of fibrous substrates while maintaining syrup stability, thereby resolving the contradiction between structural stability and impregnation quality.

The patent optimizes the syrup viscosity parameter to a specific range (10 to 10,000 mPa·s at 25°C) that balances two opposing requirements: low enough viscosity to ensure complete fiber impregnation without naked zones, and high enough viscosity to prevent excessive fluidity that would cause polymer drops to form on fibers. This precise parameter control resolves the contradiction between impregnation quality and syrup stability.

The patent applies preliminary action by incorporating a stabilizer into the (meth)acrylic syrup formulation that prevents premature polymerization during storage and handling. This allows the syrup to be prepared and stored in advance without initiating polymerization, ensuring it remains stable and ready for use. When needed, the syrup can be rapidly polymerized under controlled conditions to achieve complete fiber impregnation within 20 minutes, thus resolving the contradiction between productivity and reliability.

The patent replaces the thermal field (heating) with a chemical field approach by using a carefully selected initiator system that enables rapid polymerization at room temperature. The syrup contains an initiator and accelerator combination that triggers fast polymerization without requiring external heating, thereby achieving complete polymerization within 20 minutes while significantly reducing energy consumption and process complexity. This substitution resolves the contradiction between polymerization speed and energy use.