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三元乙丙（EPDM）

?三元乙丙橡膠是由乙烯、丙烯經溶液共聚合而成的橡膠，再引入第三單體（ENB）。三元乙丙橡膠基本上是一種飽和的高聚物，耐老化性能非常好、耐天候性好、電絕緣性能優良、耐化學腐蝕性好、沖擊彈性較好。

???生產線流程：

1. 啟動前的準備工作

   ?1.1給需要潤滑的地方涂上油脂，檢查油位，如有需要，補足油量到油位計的最大值和最小值之間。 ?

   1.2打開水、氣流獲壓縮空氣的閥門，檢查管道是否泄露。檢查水箱水位，加水至水箱容積的2/3，啟動水泵，檢查水壓值是否在0.3-0.4Mpa之間。

   1.3清理料倉和料斗，加入原料，原料至少要滿足1小時的生產。

   1.4啟動切粒機，檢查切刀的旋轉方向是否正確。 ?

2. 啟動 ?

   2.1加熱過程分三個階段來進行，每個階段之間間隔約15min。達到運行溫度時，需要再次緊固加熱器連接螺釘。 ?

   2.2根據工藝要求設定各區溫度，在各區溫度達到設定值后，保持恒溫50分鐘，進一步檢查溫控表和電磁閥是否正常。 ?

   2.3打開潤滑油閥門進一步確認沒有漏油，開啟潤滑油的水冷卻器開關。

   2.4設定主機轉速，啟動主電機并在空轉的狀態下逐漸增速，保持轉速20rpm下轉動約1分鐘，檢測主機的空轉電流是否穩定。 ?

   2.5低速啟動喂料電機并開始喂料。當有物料從機頭擠出的時候，加快螺桿轉速并逐漸加快喂料速度使其與主機轉速相匹配，每次增加不超過50rpm。

   2.6設備運轉穩定一定時間后，調節筒體截止閥開度達到最佳狀態。 ?

   2.7擠出機穩定運行后打開抽真空系統。

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   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.

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   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.

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