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氯醚橡(xiang)膠混煉(lian)機混煉(lian)工藝
氯(lv)(lv)醚(mi)(mi)橡(xiang)(xiang)(xiang)膠(jiao)(jiao)--氯(lv)(lv)醚(mi)(mi)橡(xiang)(xiang)(xiang)膠(jiao)(jiao)一(yi)般(ban)不經(jing)塑煉(lian)即(ji)可(ke)進(jin)行(xing)混(hun)(hun)煉(lian)。均(jun)聚(ju)型氯(lv)(lv)醚(mi)(mi)橡(xiang)(xiang)(xiang)膠(jiao)(jiao)門(men)尼(ni)粘度(du)低,包輥(gun)(gun)性良好(hao)(hao),但易粘輥(gun)(gun)造成混(hun)(hun)煉(lian)困(kun)難,共聚(ju)型氯(lv)(lv)醚(mi)(mi)橡(xiang)(xiang)(xiang)膠(jiao)(jiao)門(men)尼(ni)點度(du)高(gao),雖無粘輥(gun)(gun)傾向,但不易包輥(gun)(gun)。開煉(lian)機(ji)混(hun)(hun)煉(lian)均(jun)聚(ju)型氯(lv)(lv)醚(mi)(mi)橡(xiang)(xiang)(xiang)膠(jiao)(jiao)要(yao)添(tian)加防粘劑——硬(ying)脂酸(suan)、硬(ying)脂酸(suan)鋅或硬(ying)脂酸(suan)錫,開煉(lian)機(ji)混(hun)(hun)煉(lian)共聚(ju)型氯(lv)(lv)醚(mi)(mi)橡(xiang)(xiang)(xiang)膠(jiao)(jiao)進(jin),可(ke)先(xian)將(jiang)生膠(jiao)(jiao)薄通(tong)2—3次,促進(jin)其包輥(gun)(gun)。開煉(lian)機(ji)混(hun)(hun)煉(lian),輥(gun)(gun)溫比一(yi)般(ban)橡(xiang)(xiang)(xiang)膠(jiao)(jiao)高(gao)些,前輥(gun)(gun)70—75℃,后輥(gun)(gun)85—90℃。密煉(lian)機(ji)混(hun)(hun)煉(lian)比開煉(lian)機(ji)容(rong)易,混(hun)(hun)煉(lian)均(jun)聚(ju)膠(jiao)(jiao)時,18寸二手混(hun)(hun)煉(lian)機(ji),可(ke)將(jiang)防粘劑一(yi)部(bu)分(fen)投入(ru)密煉(lian)機(ji),另一(yi)部(bu)分(fen)則(ze)在壓片機(ji)上與硫化劑同時加入(ru)(輥(gun)(gun)溫在90℃以下)。混(hun)(hun)煉(lian)共聚(ju)膠(jiao)(jiao)時,操作助劑在壓片機(ji)上加入(ru)效果更(geng)好(hao)(hao)。
順丁橡膠的混煉方法
順丁橡膠(jiao)--順丁橡膠(jiao)內聚強(qiang)度低,粘附性自(zi)粘性較弱,在混(hun)(hun)煉(lian)(lian)(lian)(lian)(lian)(lian)過程中,生膠(jiao)呈破碎狀,配合(he)(he)劑分(fen)(fen)散(san)(san)(san)不(bu)(bu)良,易發生脫輥(gun)。順丁膠(jiao)在開(kai)煉(lian)(lian)(lian)(lian)(lian)(lian)機(ji)上(shang)混(hun)(hun)煉(lian)(lian)(lian)(lian)(lian)(lian)不(bu)(bu)易壓合(he)(he)成片,二手(shou)混(hun)(hun)煉(lian)(lian)(lian)(lian)(lian)(lian)機(ji)買賣,且容易脫輥(gun),故宜采用(yong)小輥(gun)矩、低輥(gun)溫(wen)(wen)(40—50℃)混(hun)(hun)煉(lian)(lian)(lian)(lian)(lian)(lian)。為使配合(he)(he)劑均勻分(fen)(fen)散(san)(san)(san),二手(shou)混(hun)(hun)煉(lian)(lian)(lian)(lian)(lian)(lian)機(ji),需進(jin)行補(bu)充加工,用(yong)密(mi)煉(lian)(lian)(lian)(lian)(lian)(lian)機(ji)混(hun)(hun)煉(lian)(lian)(lian)(lian)(lian)(lian)時(shi),容量可(ke)增(zeng)加10%,混(hun)(hun)煉(lian)(lian)(lian)(lian)(lian)(lian)溫(wen)(wen)度也可(ke)稍高,以利于配合(he)(he)劑分(fen)(fen)散(san)(san)(san),排膠(jiao)溫(wen)(wen)度一般在 130—140℃,采用(yong)兩段混(hun)(hun)煉(lian)(lian)(lian)(lian)(lian)(lian)有利于分(fen)(fen)散(san)(san)(san)均勻,也可(ke)采用(yong)逆混(hun)(hun)法混(hun)(hun)煉(lian)(lian)(lian)(lian)(lian)(lian),這(zhe)樣能節(jie)省(sheng)40%的煉(lian)(lian)(lian)(lian)(lian)(lian)膠(jiao)時(shi)間。
混煉(lian)機混煉(lian)的棍溫差異
輥(gun)(gun)(gun)(gun)溫(wen) 適當的輥(gun)(gun)(gun)(gun)溫(wen)有助于(yu)(yu)膠(jiao)(jiao)料(liao)流動,容易混(hun)煉(lian)。輥(gun)(gun)(gun)(gun)溫(wen)過高,則導致(zhi)膠(jiao)(jiao)料(liao)軟化而降低混(hun)煉(lian)效果,甚至引起膠(jiao)(jiao)料(liao)焦燒和(he)低熔(rong)點配合劑融(rong)化結團(tuan)無法分散。輥(gun)(gun)(gun)(gun)溫(wen)一般應(ying)控制在(zai)(zai)50~60℃.但(dan)在(zai)(zai)混(hun)煉(lian)高熔(rong)點配合劑的膠(jiao)(jiao)料(liao)時(shi)(shi),輥(gun)(gun)(gun)(gun)溫(wen)應(ying)適當提高。為了便(bian)于(yu)(yu)膠(jiao)(jiao)料(liao)包前(qian)輥(gun)(gun)(gun)(gun),軸承式二(er)手混(hun)煉(lian)機,應(ying)使(shi)前(qian)、后(hou)輥(gun)(gun)(gun)(gun)溫(wen)保持一定溫(wen)差。天然橡(xiang)膠(jiao)(jiao)包前(qian)輥(gun)(gun)(gun)(gun),此時(shi)(shi)前(qian)輥(gun)(gun)(gun)(gun)溫(wen)度應(ying)稍高于(yu)(yu)后(hou)輥(gun)(gun)(gun)(gun);多數合成(cheng)
橡膠(jiao)(jiao)包冷(leng)輥,此時前(qian)輥溫度應稍(shao)低于后輥。大部分合(he)成橡膠(jiao)(jiao)或生(sheng)熱量大,或對溫度敏感性大,因此輥溫應低于天然(ran)橡膠(jiao)(jiao)5~10℃以上。
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