The Preparation of Fire Retardant Paper
|School||Tianjin University of Science and Technology|
|Course||Pulp and Paper Engineering|
|Keywords||Magnesium Hydroxide Coating Flame Retardants Ceramic Fiber Paper Loss on Ignition (LOI) Tensile Index|
In this paper, fire retardant paper was prepared by three different processes including adding fire-retardants into pulp, coating fire-retardants onto paper and manufacturing flame retardant paper using ceramic fiber as raw material. The first two both depended on flame retardant systems based on magnesium hydroxide. The flame retardants were combined effectively to finalize the best flame retardants system. For the last one, different kinds of adhesives were chosen, and the effect of them and their dosages on the properties of ceramic fiber paper applied with the adhesives was investigated.The results of the first process showed that only when fire retardants dosage is up to 50%, a certain degree of flame retardancy of the flame retardant paper was achieved, after flame time is about 2.5s, after glow time about 2.15s, the length of charring nearly 77mm. The best physical properties of fire-retardant paper were attained when c-PAM dosage is 0.04%, or CMC dosage is 1.2%.The results of the second process showed that red phosphorus and APP (ammonium polyphosphate) both had obvious synergies with other flame retardants. There existed good synergy among magnesium hydroxide, aluminum hydroxide and red phosphorus, and better performance of fire retardant paper was attained when the dosage of magnesium hydroxide and aluminum hydroxide is close. Using the combination of magnesium hydroxide, hydrogen Alumina, ammonium polyphosphate, red phosphorus and zinc borate, the best flame retardancy of fire retardant paper was obtained, after flame time is about 2.5 s, after glow time about 5 s, the length of charring nearly 50 mm.According to the results of the last process, compared with using colloidal alumina alone, physical strength of ceramic fiber paper increased when using combination of colloidal alumina and water glass, and decreased when using combination of colloidal alumina and aluminum sulfate-ammonia. It is not suitable for liquid alumina to be used together with other types of adhesives, for physical strength of the ceramic fiber paper decreased when using combination liquid alumina and other kinds of adhesives. The best physical performance of ceramic fiber paper was attained when using liquid alumina alone, with tensile nearly index up to 4.70 N-m/g and low loss on ignition (≦4.6%). High strength was obtained when colloidal alumina was used alone, and loss on ignition is as low as that of liquid alumina.