摘要
本文从工艺流程、设备、原材料选择、工艺条件的控制等方面介绍了低密度PTFE生料带的成型加工工艺。结果表明,用分散聚合的中、低压缩比PTFE树脂和助挤剂,通过配混、预成型、推压、压延、萃取、干燥、拉伸等工艺可制得低密度PTFE生料带。其主要工艺参数如下:推压机口模温度30～50℃,推料杆速度控制在50～150mm/min;压延辊线速度为0.05～5m/min,上下辊温度控制在40～60℃;干燥温度为100～200℃,干燥速度0.05～0.9m/s;拉伸比在2～3之间选择。所制产品的主要性能指标已达到日本同类产品的标准:表观密度1.0～1.4g/cm^3,拉伸强度0.07MPa以上,伸长率20%以上,挥发减量0.5%以下,不燃,外观无异常。
The moulding processing technology for low density PTFE unsintered tape, including the flow sheet, equipments, raw ma-terials and technology conditions, were described in this paper. Low density PTFE unsintered tape could be produced from dis-persion polymerized medium and low compression ratio PTFE resins and extrusion aids by compounding, preforming, extru-sion, calendering, extraction, drying and tension. The mein technological parameters were as follows: die temperature 30～50℃, extrusion screw speed 50～150 mm/min, line speed of the calendering roll 0. 05～5m/min, temperature of the rolls 40～60℃, drying temperature 100～200℃, drying speed 0. 05～0.9 m/min, tensile ratio 2～3. The main property index of theproduct had approached to the standard of the same kind of products in Japen: apparent density 1. 0～1.4g/cm^3, tensilestrength>0.07 MPa,elongation>20%, volatile loss<0. 5%, flame retardant. and so on.
出处
《塑料工业》
CAS
CSCD
北大核心
1990年第4期24-26,共3页
China Plastics Industry
