三元乙丙（EPDM）
三元乙丙橡胶是由乙烯、丙烯经溶液共聚合而成的橡胶，再引入第三单体（ENB）。三元乙丙橡胶基本上是一种饱和的高聚物，耐老化性能非常好、耐天候性好、电绝缘性能优良、耐化学腐蚀性好、冲击弹性较好。
生产线流程：
1.启动前的准备工作
1.1给需要润滑的地方涂上油脂，检查油位，如有需要，补足油量到油位计的大值和小值之间。
1.2打开水、气流获压缩空气的阀门，检查管道是否泄露。检查水箱水位，加水至水箱容积的2/3，启动水泵，检查水压值是否在0.3-0.4Mpa之间。
1.3清理料仓和料斗，加入原料，原料至少要满足1小时的生产。
1.4启动切粒机，检查切刀的旋转方向是否正确。
2.启动
2.1加热过程分三个阶段来进行，每个阶段之间间隔约15min。达到运行温度时，需要再次紧固加热器连接螺钉。
2.2根据工艺要求设定各区温度，在各区温度达到设定值后，保持恒温50分钟，进一步检查温控表和电磁阀是否正常。
2.3打开润滑油阀门进一步确认没有漏油，开启润滑油的水冷却器开关。
2.4设定主机转速，启动主电机并在空转的状态下逐渐增速，保持转速20rpm下转动约1分钟，检测主机的空转电流是否稳定。
2.5低速启动喂料电机并开始喂料。当有物料从机头挤出的时候，加快螺杆转速并逐渐加快喂料速度使其与主机转速相匹配，每次增加不超过50rpm。
2.6设备运转稳定一定时间后，调节筒体截止阀开度达到佳状态。
2.7挤出机稳定运行后打开抽真空系统。
Epdm is a rubber that is polymerized by ethylene and propylene through solution, and then the third monomer (ENB) is introduced.Epdm is basically a kind of saturated high polymer, good aging resistance, good weather resistance, excellent electrical insulation, good chemical resistance and good impact elasticity.
Production line:
1. Preparation before launch.
1.1 apply grease to the place where lubrication is needed, check the oil level, and make up the maximum and minimum of the oil level if necessary.
1.2 open the valve of the compressed air and check whether the pipe is leaking.Check the water level of the tank, add water to 2/3 of the tank volume, start the pump, and check whether the water pressure value is between 0.3-0.4Mpa.
1.3 cleaning bin and hopper, adding raw materials, raw materials should meet at least 1 hour of production.
1.4 start the cutting machine to check whether the rotation direction of the cutter is correct.
2. Start
2.1 the heating process is carried out in three stages, and the interval is about 15min between each stage.When the operating temperature is reached, it is necessary to tighten the heater connection screw again.
2.2 according to the requirements of the process, the temperature of each region shall be set. After the temperature in each region reaches the set value, the temperature shall remain constant for 50 minutes, and the temperature control meter and solenoid valve shall be checked for normal.
2.3 open the lubricating oil valve to further confirm that there is no oil leak and open the water cooler switch of the lubricating oil.
2.4 set the main engine speed, start the main motor and gradually increase under the condition of idling, keep the rotating speed of 20rpm for about 1 minute, and check whether the idle current of the main engine is stable.
2.5 low speed start feeding motor and start feeding.When the material is extruded from the head, accelerate the screw speed and gradually speed up the feeding speed to match the speed of the main engine, increasing no more than 50rpm each time.
2.6 when the equipment is stable for a certain period of time, the valve opening of the regulating cylinder is at its best.
2.7 the vacuum system is opened after stable operation of the extruder.