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      四川成都永通機械經過24年的發展已成為集粉流體混合機,攪拌機,反應釜,輸送機,分散機,除塵器,計量包裝機,研磨機,涂料建材化工成套設備等綜合性機械制造企業如:干粉砂漿設備,膩子粉設備,儲罐,;⒅樵O備,涂料設備,研磨設備,化工反應釜設備,樹脂設備,等設備,永通還致力于:鋼襯塑,鋼襯PE,鋼襯PO,鋼襯四氟儲罐反應釜和管道的非標化工防腐設備生產為一體的大型企業,2009年成立四川金梯永通四氟防腐科技有限公司將四氟防腐高端技術帶進四川成都、重慶等大城市力圖打造西部化工防腐強軍。

      反應釜生產新型白乳膠工藝

      來源:永通機械設備有限公司 瀏覽次數:10433次 更新日期:2009-06-25

      新型白乳膠產品特點與用途

      新型白乳膠是一種水溶性膠黏劑,是有醋酸單體在引發劑的作用下經聚合反應而制得的一種熱塑性黏合劑,通常稱為白乳膠或簡稱PVAC乳液,化學名稱聚醋酸乙烯乳液;它是以水為分散劑,使用安全、無毒、不燃、清洗方便,常溫固化,對木材、紙張和織物有很好的黏著力,膠接強度高,固化后的膠層無色透明,韌性好,不污染被粘結物;乳液穩定性好,儲存期可達半年以上。因此,廣泛地用于印刷裝訂和家具制造,用作紙張、木材、布、皮革、陶瓷等黏合劑,還可作酚醛樹脂、脲醛樹脂等黏合劑的改性劑,用于制作聚醋酸乙烯乳膠漆等。

      聚醋酸乙烯乳液黏合劑的缺點是耐水性和耐濕性產,易在潮濕空氣中吸濕,在高溫下使用會產生蠕變現象,使膠接強度下降;在-5℃以下儲存易凍結,使乳液受到破壞。新型白乳膠以聚乙烯醇與甲醛聚合而成的高分子化合物為改性劑,使乳液的耐水性和抗凍融性能有所改善,擴大了乳液的應用范圍。

      新型白乳膠的生產工藝

      1. 溶解 將75kg蒸餾水(或冷開水、清潔水)倒入反應釜內,再將10kg聚乙烯醇緩慢加入,以直接火加熱反應釜【我公司推薦使用:電加熱反應釜、搪瓷反應釜、蒸汽加熱反應釜、導熱油加熱反應釜,安全環保!,使水溫慢慢升至90℃左右,并開動攪拌機攪拌,使其溶解。
      2. 反應 待反應釜內聚乙烯醇完全溶解后(約需2-4h),在不停攪拌下加入7.5kg醋酸乙烯、0.75kg濃度為36%的甲醛,繼續攪拌40-60min進行縮合反應。同時,小心地加入0.25kg濃度為30%的鹽酸調節pH值為2-2.5,保溫15min,使反應在酸的作用下更好地進行。
      3. 中和 用冷卻水冷卻反應釜,待溫度下降至60℃時,滴入0.25kg濃度為40%的氫氧化鈉溶液進行中和,值pH值為6-7左右,并攪拌均勻。
      4. 增塑 待反應釜內溶液溫度繼續下降至50℃時,將2.25kg鄰苯二甲酸二丁酯滴入,不斷攪拌均勻,再加入尿素3kg進行氨基化處理,達到無醛味為止,使乳液增加可塑性能。
      5. 過濾、包裝 待物料溫度下降至40℃左右,用80目過濾篩過濾,除去雜質后即得到白乳膠成品【我公司推薦使用:振動篩】。必要時可按膠料3%加入適量銳鈦型的鈦白粉,攪拌均勻,鈦白粉加入量根據白乳膠的顏色而確定,應靈活掌握。產品經檢驗合格后,用塑料桶包裝入庫。

      注:成都市新都永通機械廠工程師根據【新型白乳膠生產工藝】可為新老客戶提供反應釜、過濾篩、高速分散機、拉缸、調色罐等生產線成套設備,可參考我公司為客戶量身定制的乳膠漆成套生產設備、涂料生產線等。乳膠漆成套生產設備可實現從投料到生產,采用真空吸料、自動化生產。

      新型白乳膠生產注意事項

      1. 聚乙烯醇除起乳化作用外,還起保護膠體和增稠的作用,用量過多乳液穩定性好,但黏度大,耐水性差。從乳化效果和產品質量考慮,經實際證明,其用量以10%左右為好。
      2. 鄰苯二甲酸二丁酯可增加乳液的柔韌性和黏附力,并降低膠的成膜溫度,但用量過多會影響膠接質量并增加成本,一般用量為單體的10%左右。
      3. 聚乙烯醇聚合度對乳液的黏度有影響。一般常用的聚乙烯醇型號為1788和1799,聚合度均為1750±50,但醇解度不同。1799的醇解度高,結晶性大,其水溶液在低溫時很易凝膠,用它制成的乳液防凍性差,初黏性小,但膠接強度比1788高。1788由于在醇解時剩下一部分乙;,所以,聚乙烯醇分子結構上帶有部分不對稱結構和極性不同的基團,結晶性小,因此防凍性好。乳化作用和穩定性都比較好,但其價格較貴。因此在生產時可將兩種型號聚乙烯醇混合使用效果更好。
      4. 水是分散介質,單體或聚合物顆粒是分散在水中的,這樣使反應熱易于分散,放熱反應易控制,有助于制得均勻的高分子產物。水的用量影響乳液含量和黏度,所以應根據使用要求確定水的用量。
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