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发明公开
CN107791491A 矿用复合PVC管的制备工艺 无效 - 撤回

矿用复合PVC管的制备工艺
摘要：
本发明公布一种矿用复合PVC管的制备工艺，属于复合管生产技术领域。包括如下步骤，①对PVC管加温80℃-140℃；②组装外套管与PVC管，将PVC管两端封口并预留进气口；③用储气罐连通进气口充气；④储气罐内保持压力为1-2kg/cm2，持续时间10-15分钟；⑤储气罐内保持压力为2-4kg/cm2，持续时间15-20分钟；⑥储气罐内保持压力为4-6kg/cm2，持续时间20-30分钟；⑦PVC管外壁与外套管贴合，用水进行冷却；⑧待PVC管温度≤60℃，外套管与PVC管成为一体。本发明储气罐的压力有小到大，呈多挡依次变化，有效保护了PVC管的分子链，减少或杜绝了PVC管分子链的拉断现象。
摘要（英）：

The invention discloses a preparation technology of a mine composite PVC pipe and belongs to the technical field of composite tube production. The preparation technology comprises the following steps:(1) warming the PVC pipe to 80-140 DEG C; (2) assembling an outer bushing and the PVC pipe, and sealing the two ends of the PVC pipe and reserving an air inlet; (3) communicating the air inlet with agas storage tank to inflate; (4) keeping the pressure in the gas storage tank at 1-2kg/cm<2> for 10-15min continuously; (5) keeping the pressure in the gas storage tank at 2-4kg/cm<2> for 15-20min continuously; (6) keeping the pressure in the gas storage tank at 4-6kg/cm<2> for 20-30min continuously; (7) fitting the outer wall of the PVC pipe and the outer bushing and cooling the PVC pipe and theouter bushing with water; and (8) after the temperature of the PVC pipe is lower than or equal to 60 DEG C, integrating the outer bushing and the PVC pipe. The pressure of the gas storage tank is gradually increased and changes successively in multiple grades, so that the molecular chains of the PVC pipe are protected effectively, and the breaking phenomenon of the molecular chains of the PVC pipe is reduced or avoided.

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