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食品級潤滑油的優點 發布時間:2020-11-26


食品級潤滑油的優點

我的問題是關于在封閉的螺旋齒輪和螺旋錐齒輪上使用食品級潤滑油,主要是噴濺潤滑。通常情況下,我們指定ISO 220 EP潤滑油用于此類應用。不過,我知道,食品級潤滑油通常不含有硫-磷基EP組分。PAO/SHC或PAG食品級潤滑油比單純白礦物油有什么有點呢?就抗氧化、抗磨、耐擦傷或抗乳化方面而言有哪些優勢呢?


食品級,我假設你是指H1——可以與食品偶然接觸的油品。在這種情況下,要求油品只能含有FDA授權許可食品安全化合物清單中的添加劑。一般情況下,H1潤滑劑以聚α-烯烴(PAO)、聚亞烷基二醇(PAG)或白礦物油作為基礎油調制而成。你是正確的,常見的應用于工業齒輪油中的硫-磷化學品不符合H1要求。


H2潤滑劑,用于潤滑劑或潤滑表面沒有任何與食品接觸可能的設備和機械部件上面。這些化合物可以作為封閉系統中的設備和機械部件的潤滑劑、脫模劑或防銹膜,而潤滑劑或潤滑部件與可食用產品沒有接觸的可能。


H3潤滑劑,又稱可溶性或食用油,用于吊鉤、拉桿和類似設備的清潔和防銹。


作為齒輪箱供應商,當然是需要在高負荷條件(邊界條件)下的充分潤滑的能力。精選的H1潤滑劑滿足所需的性能(OK載荷、四球磨損和焊接點、FZG齒輪測試等),應該能夠表現的令人滿意。


在抗氧化方面,合成油(PAO、PAG等等)可以比礦物油表現的稍微好一點,而高度精煉性質意味著白油具有接近合成油的長期氧化穩定性。


同樣,白油和PAO合成油一般在抗乳化方面也優于礦物油(添加劑組分沒有主要差別時,也會影響抗乳化性),因為它們固有的“純度”和不含極性化合物。


在食品級和非食品級之間真正的問題是成本和程度較輕的性能。一般來說,非食品級潤滑劑能以較低成本提供相同或更好的性能。所以,除非使用食品級潤滑劑是必要的,你可以使用傳統的非食品級潤滑劑產品。




原文參考:

Advantages of Food-grade Lubricants

"My question concerns the use of food-grade lubricants in enclosed helical and helical-bevel gearing that is primarily splash lubricated. Normally, we specify ISO VG 220 EP lubricants for this type of gearing. However, I understand that food-grade oils do not typically contain the sulfur-phosphorous-based EP packages. What advantages do food-grade PAO/SHC or food-grade PAG lubricants offer over straight mineral or white oils? Are there any advantages in terms of oxidation resistance, anti-wear or scuffing resistance or water demulsibility?"


By food grade, I assume that you mean H1 – an oil that may be prone to incidental contact with food. Under these circumstances, the requirement is an oil that contains only additives appearing on the Food and Drug Administration’s "approved list" for food-safe compounds. Generally, H1 lubricants are formulated with polyalphaolefin (PAO), polyalkylene glycol (PAG) or white oils as the base oil. You are correct that the common sulfur-phosphorus chemistry used in many industrial gear oils does not meet H1 requirements.


H2 lubricants are used on equipment and machine parts in locations where there is no possibility that the lubricant or lubricated surface contacts food. These compounds may be used as a lubricant, release agent or anti-rust film on equipment and machine parts or in closed systems in locations where there is no possibility of the lubricant or lubricated part contacting edible products.


H3 lubricants, also known as soluble or edible oils, are used to clean and prevent rust on hooks, trolleys and similar equipment.


As a gearbox supplier, what is required of course is the ability to adequately lubricate under high-load (boundary) conditions. Provided the H1 lubricant selected meets the required performance properties (OK load, 4-ball wear and weld, FZG, etc.), it should be able to perform acceptably.


In terms of oxidation resistance, synthetic oils (PAO, PAG, etc.) may show slightly better oxidation resistance than mineral oils, while the highly refined nature of white oils means that their long-term oxidative stability should approach that of a synthetic.

Likewise, the demulsibility of white oils and PAO synthetics will generally be better than mineral oils (not withstanding any major differences in the additive package, which can also affect demulsibility) because of their inherent "purity" and absence of polar compounds.


The real issue between food grade and non-food grade is cost, and to a lesser extent performance. Generally speaking, non-food-grade lubricants will provide the same or often better performance at a lower cost. So unless a food-grade lubricant is necessary for the intended application, you are typically better served with a "conventional" non-food-grade product.


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