产品性能：
聚苯并咪唑纤维呈金黄色，抗张强度39.7～43.2cN/dtex（短纤维为27.4cN/dtex），延伸率23%～24%（短纤维为30%）。突出性能是在火焰及高温下仍有良好的尺寸稳定性，在空气中不燃，在氧气中燃烧缓慢。可耐强酸、强碱、有机溶剂，是唯一兼有耐高温、耐化学品腐蚀及良好纺织性能的合成纤维。吸湿率15%，高于棉花，手感好，织物穿着舒适。
制作方法：
聚苯并咪唑纤维是由 3，3′，4，4′-四氨基联苯与间苯二甲酸二苯酯在高温及惰性气流下，先制得泡沫状预聚体，经冷却、粉碎后在真空高温下进行固相缩聚，得到对数比粘度为 0.7～0.8dl/g的聚苯并咪唑(简称PBI)，这种聚合物加压溶于含有少量氯化锂的二甲基乙酰胺中，进行干法纺丝，丝经拉伸及磺化处理，以降低在火焰和高温中的收缩率，最后进行卷曲和切断，得到纤维。也可在乙二醇凝固浴中进行湿法纺丝，再经水洗和干燥后，在高温下拉伸、热定型得到纤维。
应用领域：
聚苯并咪唑纤维可用于制作宇宙飞船中的绳索、耐烧蚀热屏蔽材料、减速用阻力降落伞及宇航员的加压安全服等。在一般工业中可作石棉代用品，包括耐高温手套、高温防护服、传送带等，使用温度常为250～300℃，能在500℃下短时间使用，还可作气体、液体的耐腐蚀滤材和烟道气滤袋，可在150～200℃范围内使用，在酸的露点温度以下不受腐蚀。聚苯并咪唑纤维还可与聚间苯二甲酰间苯二胺纤维混织，经碳化以后的纤维可作复合材料的高强度、高模量增强材料，其中空纤维（见化学纤维）可用作反渗透膜。
聚苯并咪唑纤维是采用先进的静电纺丝技术制备而成，PBI长纤丝径均匀，拥有着高强度，高拉伸，导热小，隔热性能极强，防火阻燃，耐化学腐蚀，耐辐射等特性，是消防装备，防弹装备，宇航服，防化服，户外装备，降落伞，航空航天复合隔热层的最佳材料。
Product Performance:
Polybenzimidazole fiber is golden yellow, tensile strength is 39.7~43.2cN/dtex (short fiber is 27.4cN/dtex), and elongation is 23%~24% (short fiber is 30%). The outstanding performance is that it still has good dimensional stability under flame and high temperature, is non-combustible in air, and burns slowly in oxygen. It can resist strong acids, strong alkalis and organic solvents, and is the only synthetic fiber with high temperature resistance, chemical corrosion resistance and good textile properties. The moisture absorption rate is 15%, which is higher than that of cotton, and the feel is good, and the fabric is comfortable to wear.
Directions:
Polybenzimidazole fiber is made of 3,3′,4,4′-tetraaminobiphenyl and diphenyl isophthalate under high temperature and inert gas flow, first prepared foam-like prepolymer, after cooling, crushing and solid phase polycondensation at vacuum high temperature to obtain polybenzimidazole (referred to as PBI) with logarithmic viscosity of 0.7~0.8dl/g, this polymer is dissolved in dimethylacetamide containing a small amount of lithium chloride under pressure, dry spinning, silk stretching and sulfonation treatment, in order to reduce the shrinkage rate in flame and high temperature, Finally, it is curled and cut to obtain the fibers. It can also be wet spun in a glycol coagulation bath, and then washed and dried with water, and then stretched and heat-set at high temperature to obtain fibers.
Applications:
Polybenzimidazole fibers can be used to make ropes in spacecraft, ablative heat shielding materials, drag parachutes for deceleration, and pressurized safety suits for astronauts. It can be used as an asbestos substitute in general industry, including high-temperature resistant gloves, high-temperature protective clothing, conveyor belts, etc., the use temperature is often 250~300 °C, which can be used for a short time at 500 °C, and can also be used as a corrosion-resistant filter material for gas and liquid and flue gas filter bag, which can be used in the range of 150~200 °C, and is not corroded below the dew point temperature of the acid. Polybenzimidazole fibers can also be blended with polyisophthaloyl-m-phenylenediamine fibers, and the carbonized fibers can be used as high-strength and high-modulus reinforcement materials for composite materials, and the hollow fibers (see chemical fibers) can be used as .
reverse osmosis membranes.
Polybenzimidazole fiber is prepared by advanced electrospinning technology, PBI filament has a uniform diameter, has high strength, high tensile, small thermal conductivity, strong thermal insulation performance, fire retardant, chemical corrosion resistance, radiation resistance and other characteristics, is the best material for fire fighting equipment, bulletproof equipment, spacesuits, chemical protection suits, outdoor equipment, parachutes, aerospace composite thermal insulation layer.
