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</table> <div id="qwcagsgoaso" class="text-more" contextmenu="return false" unselectable="on">  <div> <p>據記載，中國是世界上早生產(chǎn)炭黑的國家之一。在古時(shí)候，人們焚燒動(dòng)植物油、松樹(shù)枝,收集火煙凝成的黑灰，用來(lái)調制墨和黑色顏料。這種被稱(chēng)之為“炱”的黑灰就是早的炭黑。<br /> 1821 年人們在北美地區用天然氣為原料生產(chǎn)炭黑，從此炭黑不再是“炱”那么簡(jiǎn)單，它是“氣態(tài)或液態(tài)的碳氫化合物在空氣不足的條件下進(jìn)行不完全燃燒或熱裂分解所生成的無(wú)定形碳，為疏松、質(zhì)輕而極細的黑色粉末”。大片油氣田相繼開(kāi)采,源源不斷的原料供應推動(dòng)炭黑生產(chǎn)由手工操作邁入了大規模工業(yè)化時(shí)代。<br /> 1912 年人們發(fā)現炭黑對橡膠具有補強作用，從此炭黑逐漸成為橡膠工業(yè)不可缺少的原材料。世界橡膠工業(yè)原材料耗用量排在位的是生膠，第二位的是炭黑；換言之，炭黑已成為消費量大的橡膠配合劑。炭黑的耗用量一般占橡膠耗用量的40%～50%，也就是說(shuō)，在橡膠配方中，通常每使用2份橡膠就會(huì )搭配使用1份炭黑。<br/><img src="http://jmage0.huangye88.net/live/2021/07/18/acd4fd3f9c21d0b8e69b37c65d3e1a4c.jpg@750w_750h_90Q" /><br/>為了適應從海洋生物演變?yōu)殛懙厣?，陸生植物開(kāi)始產(chǎn)生海洋生物所不具有的抗氧化劑比如維生素C、多酚和生育酚。五千萬(wàn)年到兩億年前被子植物植物在進(jìn)化的過(guò)程中發(fā)展出了許多抗氧化的天然色素--特別是在侏羅紀時(shí)代--作為一種化學(xué)手段抵御光合作用的副產(chǎn)物活性氧類(lèi)物質(zhì)。本來(lái)抗氧化劑一詞特指那類(lèi)可以防止氧氣消耗的化學(xué)物質(zhì)。在19世紀末至20世紀初，廣泛研究集中在重要的工業(yè)生產(chǎn)過(guò)程對抗氧化劑的使用上，比如防止金屬腐蝕、橡膠的硫化、由燃料聚合導致的內燃機積垢等。<br /> 生物學(xué)對抗氧劑的研究早期集中在是如何使用抗氧化劑來(lái)避免不飽和脂肪酸氧化引起的酸敗?？梢酝ㄟ^(guò)將一塊脂肪置于一個(gè)充氧的密封容器后對其氧化速率進(jìn)行測定的簡(jiǎn)單方法度量抗氧化活性。然而隨著(zhù)具有抗氧化作用的維生素A、C、E的發(fā)現和確認，人們意識到抗氧化劑在生物體內起到生化作用的重要性。當認識到具有抗氧化活性的物質(zhì)可能本身就容易被氧化的事實(shí)后，對抗氧化劑可能作用機理的探索開(kāi)始。通過(guò)研究維生素E如何防止脂質(zhì)過(guò)氧化，明確了抗氧化劑作為還原劑通過(guò)與活性氧物質(zhì)反應來(lái)避免活性氧物質(zhì)對細胞的破壞，達到抗氧化的效果。<br/><img src="http://jmage0.huangye88.net/live/2022/04/08/0b40087b79d0b2be2cfbeb201b0efea4.jpg@750w_750h_90Q" /><br/>消泡劑應具備下列性質(zhì)：①消泡力強，用量少；②加到起泡體系中不影響體系的基本性質(zhì)，即不與被消泡體系起反應；③表面張力??；④ 與表面的平衡性好；⑤耐熱性好；⑥擴散性、滲透性好，正鋪展系數較高；⑦化學(xué)性穩定，耐氧化性強；⑧氣體溶解性、透過(guò)性好；⑨在起泡性溶液中的溶解性??；⑩無(wú)生理活性，安全性高。 <br /> 消泡劑的應用十分廣泛，如食品工業(yè)、造紙工業(yè)、水處理、采油工業(yè)、印染工業(yè)、涂料工業(yè)、洗滌劑工業(yè)、橡膠膠乳工業(yè)、氣溶膠工業(yè)、日化工業(yè)、醫藥工業(yè)、奶制品工業(yè)等。</p> </div> <div id="qwcagsgoaso" class="pages"> <span id="qwcagsgoaso" class="leftpage"><font>上一條 </font><a target="_blank" title="荊州二手油墨回收印刷油墨收購">荊州二手油墨回收印刷油墨收購</a></span> <span id="qwcagsgoaso" class="rightpage"><font> 下一條</font><a href="http://m.guizhouboda.com/sell/info-052md54v04a617.html" target="_blank" title="武清進(jìn)口油墨回收紙張油墨收購">武清進(jìn)口油墨回收紙張油墨收購</a></span> </div> </div> </div> </div> </div> <div id="qwcagsgoaso" class="list"> <h2 class="titles" style="float:left;">環(huán)?；ぶ鷦┗厥障嚓P(guān)信息</h2> <a class="r-more" rel="nofollow" target="_blank" style="float:right;margin-right:30px;">查看更多信息</a> <div id="qwcagsgoaso" class="similar-info"> <ul class="info-item"> <li > <a target="_blank" title="棗莊倉庫到期庫存化學(xué)原料回收"> <img src="http://oss11.huangye88.net/live/2024/11/25/98424a13963e05172c23797903caabb0.jpg@1e_1c_220w_220h_90Q"> </a> <a class="ci" target="_blank" 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