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style="text-indent:25px">金屬脫脂除油是機(jī)械涂裝行業(yè)前處理工藝中較關(guān)鍵的工序之一。金屬表面脫脂的程度將直接影響磷化序和涂裝質(zhì)量。它利用高效液體脫脂劑對油脂和污物的皂化，徐州脫脂劑生產(chǎn)廠家、潤濕、乳化、滲透、卷離、分散和增溶等作用把工件表面的各種油脂、灰塵泥沙、金屬粉末手汗及其工件在加工過程中所粘附的油性臟物高效的去除脫離徹底。隨著環(huán)保要求的提高，目前比較流行研究應(yīng)用生物可降解表面活性劑，對于活性劑，清洗劑要求無磷、無硅和低COD/BOD排放。雖然此方面的研究工作已開展30多年，徐州脫脂劑生產(chǎn)廠家，但是目前還沒有一種無磷助劑能夠同時(shí)保證去污能力、對人體和環(huán)境無危害和潛在危害，徐州脫脂劑生產(chǎn)廠家、成本較低這3項(xiàng)要求?，F(xiàn)在已研究出無磷脫脂劑，但成本高，應(yīng)用還有一定的阻力。除油脫脂劑所需要清洗的油污有皂化油類和非皂化油類。徐州脫脂劑生產(chǎn)廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="徐州脫脂劑生產(chǎn)廠家,脫脂劑" src="https://tyunfile.71360.com/UploadFile/haolin123/637333784186044922/7495406.png"></div><p style="text-indent:25px">化學(xué)性質(zhì)根據(jù)油污能否與脫脂劑發(fā)生化學(xué)反應(yīng)而分為可皂化油污和不可皂化油污。植物油脂和動(dòng)物油脂是可皂化的，他們可以依靠皂化、乳化和溶解的作用脫除。礦物油和凡士林是不可皂化的，他們只能依靠乳化或溶解的作用來脫除。物理性質(zhì)根據(jù)油污黏度或滴落點(diǎn)的不同，其形態(tài)有液體和半固體。黏度越大或滴落點(diǎn)越高．清洗越困難。根據(jù)油污對基體金屬的吸附作用?？煞譃闃O性油污和非極性油污。極性油污，如含有脂肪酸和極性添加劑的油污，有強(qiáng)烈的吸附在基體金屬上的傾向，清洗較困難，要靠化學(xué)作用或較強(qiáng)的機(jī)械作用力來脫除。臺(tái)州除油劑在電鍍加工過程中，應(yīng)用比較多的還是水基脫脂劑。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="徐州脫脂劑生產(chǎn)廠家,脫脂劑" src="https://tyunfile.71360.com/UploadFile/haolin123/637333784089150391/7621596.png"></div><p style="text-indent:25px">除油脫脂劑對脫脂效果的影響：除油脫脂劑的組成和使用方法對脫脂效果有很大的影響。例如，含有表面活性劑的堿性除油脫脂劑比單獨(dú)的堿性溶液脫脂效果好。對于滴落點(diǎn)高的固態(tài)或半固態(tài)油脂，用溶劑清洗比用其他脫脂效果有效。為了提高油污的乳化和分散能力，適當(dāng)提高除油脫脂劑中表面活性劑的含量是有效的，不同的表面活性劑品種及不同的堿性物都使脫脂效果產(chǎn)生一定差異，良好的除油脫脂劑都是經(jīng)過大量試驗(yàn)，對其成分相互搭配比例進(jìn)行反復(fù)篩選而確定的。對于含有表面活性劑的堿性除油脫脂劑，較有效的發(fā)揮洗凈作用是在表面活性劑的臨界膠束濃度的上限。使用過程中，除油脫脂劑會(huì)不斷的被消耗，使?jié)舛冉档?，因此，必須定期的補(bǔ)加脫脂劑原液，以保持必要的濃度。除油脫脂劑的脫脂效果與濃度并不是直線上升的關(guān)系，因此對于脫脂質(zhì)量要求很高的情況，不應(yīng)當(dāng)采取大幅度提高濃度的方法，而應(yīng)該采用二次脫脂的辦法，倆個(gè)脫脂液可以是相同的，而且不必額外的提高濃度。</p><p style="text-indent:25px">堿性化學(xué)脫脂劑除油機(jī)理:皂化作用：金屬表面油脂中的動(dòng)植物油（主要成分是硬脂酸），與堿性化學(xué)脫脂劑中的堿生成硬脂酸鈉（即肥皂）和甘油溶解進(jìn)入堿性溶液，俗稱皂化反應(yīng)，以除去金屬表面油脂。乳化作用：乳化劑為表面活性物質(zhì)，吸附在界面上，憎水基團(tuán)向著金屬基體，親水基團(tuán)溶液方向，使金屬與溶液間界面張力降低，從而在流體動(dòng)力等因素的作用下，油膜破裂變成細(xì)小的珠狀，脫離金屬表面，到溶液中形成乳濁液。皂化與乳化作用是相輔相成的，相互配合才能徹底去除金屬表面油污。浸透潤濕作用：皂化與乳化作用均系從油污表面逐步進(jìn)行，而使含堿性化學(xué)脫脂劑的堿性溶液浸透油脂內(nèi)部，達(dá)到并潤濕工件表面，增進(jìn)了脫脂除油的效果，這就是表面活性劑的浸透潤濕作用。此外還仍具有分散作用，將從工件除下的油脂分散到脫脂液之中。浸泡脫脂所需設(shè)備簡單、對復(fù)雜工件、有空腔結(jié)構(gòu)等的工件脫脂效果好，但脫脂處理時(shí)間相對較長。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="徐州脫脂劑生產(chǎn)廠家,脫脂劑" src="https://tyunfile.71360.com/UploadFile/haolin123/637333784108935547/3139676.png"></div><p style="text-indent:25px">脫脂劑的漂洗性能。漂洗性能試驗(yàn)主要用于檢查覆蓋在鋼帶基板表面上的清洗劑殘留物被水洗去的性能。將在清洗劑中清洗后的試片取出呈45°角放置到晾干為止，將晾干的試片全浸在蒸餾水中擺洗10次立即取出用熱風(fēng)機(jī)吹干試片。檢查試片表面有無清洗劑的殘留物，再在試片上滴一滴無水乙醇，乙醇自然揮發(fā)后再檢查試片上有無白色殘留物。對金屬的腐蝕性能。對金屬的腐蝕性能試驗(yàn)是將試片全浸在一定溫度的水基脫脂劑水溶液中，以試片失重和表面顏色的變化評(píng)定清洗劑對金屬的腐蝕性能。我們可以從金屬脫脂劑的外觀、PH值、消泡性能、漂洗性能、總堿度的檢測來綜合判斷金屬脫脂劑的質(zhì)量如何。湖州脫脂劑生產(chǎn)廠家</p><p style="text-indent:25px">金屬脫脂劑主要用于脫除金屬材料表面的油污、油脂類。徐州脫脂劑生產(chǎn)廠家</p><p style="text-indent:25px">我們選擇脫脂劑前應(yīng)先了解所脫脂脂的種類。如果是蠟質(zhì)油脂，比如拋光膏、拉伸油、凡士林等，應(yīng)選擇乳化脫脂劑為佳。這時(shí)若使用70℃以上高溫，再配合超聲波，其效果更好。如果是普通油脂，則較好選擇置換型脫脂劑，可使在室溫下脫脂，節(jié)能明顯。如果零件表面浮灰較多，則應(yīng)在化學(xué)脫脂后再補(bǔ)充電解脫脂，或采用擦洗脫脂。還可以選擇一種置換型脫脂劑，采用不同溫度下去除不同油脂的方法。但這種方法在高溫下要使用較低濃度，否則會(huì)有表面活性劑物質(zhì)析出粘在零件上更難以去除而造成麻煩。在使用脫脂劑時(shí)，不僅要注意它的性能，還應(yīng)考慮到經(jīng)濟(jì)因素。脫脂劑的使用壽命是決定成本的主要因素。脫脂劑的壽命由長到短的順序是：置換型大于乳化型大于皂化型。徐州脫脂劑生產(chǎn)廠家</p><p style="text-indent:25px">上海昊琳化工有限公司總部位于白鶴鎮(zhèn)白石公路1360路28號(hào)，是一家化學(xué)原料及產(chǎn)品（除危險(xiǎn)化學(xué)品、監(jiān)控化學(xué)品、煙花爆竹、易制毒化學(xué)品）的銷售，包括環(huán)保化學(xué)鍍鎳、脫脂清洗劑、拋光鈍化劑（前處理和后處理使用制劑）、鋁浸鋅液等化學(xué)制品，五金制品、機(jī)械零配件生產(chǎn)、加工和其他的公司。上海昊琳化工作為化學(xué)原料及產(chǎn)品（除危險(xiǎn)化學(xué)品、監(jiān)控化學(xué)品、煙花爆竹、易制毒化學(xué)品）的銷售，包括環(huán)?；瘜W(xué)鍍鎳、脫脂清洗劑、拋光鈍化劑（前處理和后處理使用制劑）、鋁浸鋅液等化學(xué)制品，五金制品、機(jī)械零配件生產(chǎn)、加工和其他的企業(yè)之一，為客戶提供良好的環(huán)?；瘜W(xué)鍍鎳，脫脂清洗劑，拋光鈍化劑，鋁浸鋅液。上海昊琳化工致力于把技術(shù)上的創(chuàng)新展現(xiàn)成對用戶產(chǎn)品上的貼心，為用戶帶來良好體驗(yàn)。上海昊琳化工始終關(guān)注化工行業(yè)。滿足市場需求，提高產(chǎn)品價(jià)值，是我們前行的力量。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1773837.html</p></div></div></div></div></div><div id="tgdv88w" class="page-right twoColRt"><div id="6oqn3e2" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="vi8dv37" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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