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電泳專用超濾膜簡介中英對照版

1425 人參與 2011年11月26日 02:39 分類 : 電泳工藝電泳原理評論

Membranes????????? 隔膜

Membranes are selective barriers which allow particles or molecules of? one kind to pass and exclude all others. This condition can be achieved by using size-exclusion membranes or by using anolyte (electrodialysis) membranes which operate in the presence of dense electric charges. 隔膜可以有選擇性的允許一種粒子或一種分子通過，而擋住其它物質(zhì)。使用特定尺寸的隔膜或使用在高電荷密度下運(yùn)行的陽極液（電滲析）隔膜，可以達(dá)到這種狀況。 Two types of membranes are found in all electrocoat tanks: anolyte and ultrafilter membranes.? The purpose of the anolyte membrane is to remove acid buildup which occurs when cationic resin is deposited upon a part.? The purpose of the ultrafilter system is twofold: 在所有的電泳槽中泳用到兩種隔膜，陽極膜和超濾膜。陽極膜的作用是除去陽離子樹脂電泳到工件時產(chǎn)生的酸積聚。超濾膜的作用有兩個： To provide a rinse solution to achieve the closed loop system, which will remove dragout, enabling high paint usage and resulting in clean coated products. 為閉路沖洗系統(tǒng)提供清洗液，沖洗掉由電泳槽中帶出的浮漆，提高油漆利用率，從而得到清潔的產(chǎn)品。 To remove water-soluble contaminants which might enter the tank through phosphate carry-in. 除去可能從磷化帶入電泳槽中的水溶性污染物。

1.1.1.????????????? Ultrafilter Membranes

???????? ???超濾膜

Ultrafilter membranes work on the principle of size exclusion. Dissolved molecules and particles are sorted out according to whether or not they are small enough to pass through the pores of the membrane. 超濾膜是利用篩分原理工作藉此把所需的并能通過隔膜微孔的物質(zhì)與不能通過的溶解分子顆粒分開。 In normal particulate filtration, liquid is forced under pressure through a porous medium. In ultrafiltration, similarly, liquid is forced under pressure through a porous medium. However, the pores are 1,000 times smaller. In fact, the membranes are so small that even some bacteria are unable to pass through. 一般的過濾是在壓力作用下強(qiáng)行是液體通過多孔介質(zhì)，同樣，在超濾中，也實(shí)在壓力下強(qiáng)行通過多孔介質(zhì)。然而，這孔徑要小1，000倍，實(shí)際上，隔膜的孔徑小得連有些細(xì)菌都不能通過。 The ultrafilter membrane will pass water, acid, some solvent, low-molecular- weight fractions of resin, and contaminating ions. When the bath is operating within the proper conductivity parameters, the ultrafiltrate is used to achieve the closed-loop rinse system. High conductivity is an indication of ion contamination. When this condition occurs, the ultrafiltrate is sent to drain, and deionized water is added to the rinses. 超濾膜可以通過水，酸，某些溶劑，低分子量樹脂及雜質(zhì)離子。當(dāng)電泳槽在正常的電導(dǎo)率參數(shù)內(nèi)運(yùn)行時，使用超濾供封閉循環(huán)的清洗系統(tǒng)，電導(dǎo)率高，表明有離子污染，當(dāng)發(fā)生這樣情況時，要排放超濾液，加去離子水供清洗用。 Two forces oppose the production of ultrafiltrate: osmotic force and concentration polarization force: 阻礙超濾液的生成有兩種力，滲透力和濃差極化力。 Osmotic force is the tendency of a solvent to equalize concentration throughout its volume. This force is overcome by applying pressure to the paint passing through the ultrafilter. 滲透力是一個溶劑在其容積內(nèi)濃度不斷平衡的趨勢。這個力靠施加壓力使油漆通過超濾裝置來克服。 Concentration polarization force is the tendency for molecules to build up or concentrate at the membrane surface. Again, pressure may be applied, but a rapid movement of paint across the membrane is also important.? At least four types of ultrafilters are available: 濃差極化力是分子在膜表面堆積或濃縮的趨勢。仍然是要施加壓力，而且使油漆快速通過膜表面，來減少這個濃差極化力。超濾裝置有四種類型中，后面兩種最普及。

Plate and frame

板框式

Spiral wound

螺旋式

Open tube

開管式

Hollow fiber

中空纖維式

1.1.2.????????????? Anolyte Membranes

??????????? 陽極液隔膜

These membranes work on the principle of electrodialysis. Unlike ultrafilters, they do not require pressure. The energy required is supplied by an electric field across the membrane. This membrane has a dense concentration of fixed charges and contains fine pores, permitting it to be selectively permeable to ions bearing the correct charge. 這類隔膜以電滲析原理工作，與超濾器不同，他們不需要壓力。由穿過隔膜的兩側(cè)提供所需的能量，隔膜帶有稠密的電荷密度及微孔。能有選擇的允許帶相應(yīng)電荷的離子透過。 When the resin deposits at the cathode, the counter ion which keeps the resin in solution accumulates. Since the counter ion is acidic, its buildup reduces the pH. However, the anolyte membrane permits the acid, but not the resin, to pass. Thus, the excess acid is removed, and the target pH of the bath is maintained. 當(dāng)樹脂在陰極上沉淀時，平衡樹脂的離子在溶液中累積，由于這些平衡離子是酸性的，它的累積使pH下降。然而，陽極液隔膜僅允許酸通過，但不允許樹脂通過。這樣，除去多余的酸，來維持槽液的正常pH值。

Section Summary

本節(jié)摘要 Summary:? Resin and pigment are deposited at the cathode in the cathodic system of electrocoating. This method is superior to the anodic method because of the greatly enhanced corrosion protection. 要點(diǎn)：在陰極電泳系統(tǒng)中，樹脂和顏料沉積在陰極上，因此大大地提高了防腐蝕性，這個方法比陽極法優(yōu)越。 The four reactions that occur as a car body is being coated are listed below. The key word from the definition follows in parentheses. 下面列出了涂裝一臺車身時發(fā)生的四個反應(yīng)。定義的關(guān)鍵字寫在括號中。 1???????????? Electrolysis (decomposition) 電解（分解） 2???????????? Electrophoresis (migration) 電泳（泳動，遷移） 3???????????? Electrodeposition (precipitation) 電沉積（析出） 4???????????? Electroendosmosis (dehydration) 電滲（脫水）

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