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為什么要選擇親水性極強的乳化劑

2018-02-01     524次瀏覽

一、HLB值 乳化劑必須有較強的乳化能力,評定這種乳化能力的標準是乳化劑的HLB值。它表示乳化劑的親油基和親水基之間在大小和力量上的平衡關系。 HLB值=7+Σ(親油基)+Σ(親水基) 也可根據乳化劑的HLB值表查詢 由于瀝青的HLB值一般為8~18,用于瀝青的乳化劑的HLB值也應該近在此范圍為宜。如果作為乳化瀝青的乳化劑親水基過大,親油基數過小,與水連接,與瀝青脫離;如果乳化劑親油基數過大,親油基數過小,只與瀝青連接,與水脫離。只有親油基與親水基為適宜時,乳化劑便將瀝青和水相連接起來。 這就是說有許多帶有親油基和親水基結構的表面活性劑不能作用乳化劑,尤其不能作為瀝青乳化劑广东11选5走势图。因此,當瀝青的標號與成分發生變化時,一定要重新配乳化劑的品種及用量。

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