Polyurethane composites and methods of preparation are described herein. The methods of making the polyurethane composite can include mixing (1) at least one isocyanate selected from the group consisting of diisocyanates, polyisocyanates, and mixtures thereof, (2) at least one polyol, (3) an inorganic filler, and (4) an evaporative coolant in an extruder to form a mixture. The method also include extruding the mixture into a mold cavity, generating heat in the mold cavity from the reaction of the at least one isocyanate and the at least one polyol, and allowing the evaporative coolant to migrate to an interface between the mixture and the interior mold surface. The temperature of the mixture causes evaporation of the evaporative coolant at the interface thereby removing heat at the interface. Suitable evaporative coolants for use in the methods of making the polyurethane composites include hydrofluorocarbons and hydrochlorofluorocarbons.
本文描述了聚
氨酯复合材料及其制备方法。制造聚
氨酯复合材料的方法可包括在挤压机中混合 (1) 至少一种选自二
异氰酸酯、多
异氰酸酯及其混合物的
异氰酸酯、(2) 至少一种多元醇、(3) 无机填料和 (4) 蒸发冷却剂,以形成混合物。该方法还包括将混合物挤入模腔,在模腔中产生至少一种
异氰酸酯和至少一种多元醇反应产生的热量,并允许蒸发冷却剂迁移到混合物和模具内表面之间的界面。混合物的温度会导致蒸发冷却剂在界面处蒸发,从而带走界面处的热量。适用于聚
氨酯复合材料制造方法的蒸发冷却剂包括氢
氟碳化合物和氢
氯氟碳化合物。