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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/2022/04/08/1c41b3289aaa0165ea2472c7cd02d038.jpg@750w_750h_90Q" /><br/>松香可從世界各地類(lèi)似松樹(shù)的樹(shù)種中獲得，特別是產(chǎn)于美國東南部的長(cháng)葉松（Pinus palustris）、古巴松（Pinus caribaea）和火炬松（Pinus taeda）。在這些樹(shù)身上割出口子，使高黏度的分泌物，稱(chēng)為松脂精（Gum thus）被蒸餾提取。這種易揮發(fā)的液體就是松節油；剩下的硬實(shí)樹(shù)脂叫做松香。盡管松香作為任何上光油和顏料的成分，都不盡如人意，但由于它是廉價(jià)的原料之一，它一直作為上光油和顏料的摻雜物而被使用。另外，松香在藝術(shù)領(lǐng)域里還有其他許多用途，如黏結、密封和其他機械性作用。松香還曾被稱(chēng)為松脂（Colophony）和希臘樹(shù)脂（Greek pitch）。<br/><img src="http://jmage0.huangye88.net/live/2021/07/18/acd4fd3f9c21d0b8e69b37c65d3e1a4c.jpg@750w_750h_90Q" /><br/>硬脂酸是自然界廣泛存在的一種脂肪酸，幾乎所有油脂中都有含量不等的硬脂酸，在動(dòng)物脂肪中的含量較高，如牛油中含量可達24%，植物油中含量較少，茶油為0.8%，棕櫚油為6%，但可可脂中的含量則高達34%。工業(yè)硬脂酸的生產(chǎn)方法主要有分餾法和壓榨法兩種。在硬化油中加入分解劑，然后水解得粗脂肪酸，再經(jīng)水洗、蒸餾、脫色即得成品。同時(shí)副產(chǎn)甘油。<br /> （1）分餾法在水解鍋中加入棉籽油硬化油6t，水解劑硬脂酸甲酚磺酸和硬脂酸萘磺酸120kg。通入蒸氣至油層透明后，加水4200kg。繼續加熱至沸，常壓下反應7.5h，澄清0.5h，分離下層甘油水。此后再加水解劑120kg，通入蒸氣加熱到油層透明后，加水3600kg，反應約10h，當混合酸價(jià)達190mg KOH/g以上時(shí)即為水解終點(diǎn)。此后澄清0.5h，分離甘油水后，加鹽7kg、水3600 kg進(jìn)行水洗。再用鹽14kg、水4200kg進(jìn)行二次水洗滌。步洗滌后澄清0.5h，第二步洗滌后澄清2h。<br/><img src="http://jmage0.huangye88.net/live/2021/07/18/510181625d863db32cc2fd0e67a0d94e.jpg@750w_750h_90Q" /><br/>草酸又名乙二酸，廣泛存在于植物源食品中。草酸是無(wú)色的柱狀晶體，易溶于水而不溶于乙醚等有機溶劑，<br /> 草酸根有很強的配合作用，是植物源食品中另一類(lèi)金屬螯合劑。當草酸與一些堿土金屬元素結合時(shí)，其溶解性大大降低，如草酸鈣幾乎不溶于水。因此草酸的存在對礦物質(zhì)的生物有效性有很大影響；當草酸與一些過(guò)渡性金屬元素結合時(shí)，由于草酸的配合作用，形成了可溶性的配合物，其溶解性大大增加 [2] 。<br /> 草酸在100℃開(kāi)始升華，125℃時(shí)迅速升華，157℃時(shí)大量升華，并開(kāi)始分解。<br /> 可與堿反應，可以發(fā)生酯化、酰鹵化、酰胺化反應。也可以發(fā)生還原反應，受熱發(fā)生脫羧反應。無(wú)水草酸有吸濕性。草酸能與許多金屬形成溶于水的絡(luò )合物。<br/><img src="http://jmage0.huangye88.net/live/2022/04/08/edcd211dc854358f41de5977de115477.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://oss.huangye88.net/live/2021/06/11/dc0979fccfc87a14d03f1499cbbef84a.jpg@750w_750h_90Q" /><br/>①二苯乙烯型，用于棉纖維及某些合成纖維、造紙、制皂等工業(yè)，具有藍色熒光；<br /> ②香豆素型，具有香豆酮基本結構，用于賽璐璐、聚氯乙烯塑料等，具有較強的藍色熒光；<br /> ③吡唑啉型，用于羊毛、聚酰胺、腈綸等纖維，具有綠色熒色；<br /> ④苯并氧氮型，用于腈綸等纖維及聚氯乙烯、聚苯乙烯等塑料，具有紅色熒光；<br /> ⑤苯二甲酰亞胺型，用于滌綸、腈綸、錦綸等纖維，具有藍色熒光。<br /> 按用途常分為：<br /> ①洗滌劑用熒光增白劑；②紡織品熒光增白劑；③造紙用熒光增白劑；④塑料和合成材料用熒光增白劑；⑤其他用途的熒光增白劑。</p> </div> <div id="qwcagsgoaso" class="pages"> <span id="qwcagsgoaso" class="leftpage"><font>上一條 </font><a href="http://m.guizhouboda.com/sell/a93j40l98dd892.html" target="_blank" title="佛山熱熔膠回收專(zhuān)業(yè)回收">佛山熱熔膠回收專(zhuān)業(yè)回收</a></span> <span 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