Environmentally Friendly Lubricants Related Issues (1)--Li Yunpeng

We, especially as chemical industry practitioners, often say that structure determines properties. For example, allotropes refer to simple substances that are composed of the same single chemical element but have different properties. The same element is different due to different arrangements. The physical chemical properties of.

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Coal, diamond, fullerene are all carbon.An isomer is a compound that has the same molecular formula but a different arrangement of atoms. Simply put, the phenomenon that compounds have the same molecular formula but different structures is called isomerism; compounds with the same molecular formula but different structures are isomers of each other. Although many isomers have similar properties, in general their chemical properties are different. In organic chemistry, isomers can be similar substances (containing the same functional groups) different types of substances (containing different functional groups). For example, ethanol methyl ether are composed of C2H6O, but they have completely different properties.

It can be roughly understood that in the field of lubricants, the same oil, such as hydraulic oil, can be divided into biodegradable non-biodegradable.

The so-called biodegradation means that the material is continuously discharged the body during the process of tissue growth through dissolution, enzymatic hydrolysis, cell phagocytosis in the organism. The repaired tissue completely replaces the position of the implanted material, the material does exist in the body. Residual nature.

Specific to lubricants, bio-degradable (bio-degradable) is also called Environment friendly, that is, green oil.

A typical example, more than 80% of the hydraulic oil used in the forest mining industry in Sweden Germany are green hydraulic oil.

Generally, mineral oil has poor biodegradability does decompose after being exposed to the air for 3 years, while green oil products can generally be degraded into carbon dioxide water by active microorganisms within 18-28 days.

At present, several major lubricant products, such as outboard two-stroke engine oil, chain saw oil, hydraulic oil, machining lubricant, food processing machinery lubricant, are increasingly using environmentally friendly products.

The International Organization for Standardization (ISO) passed the draft ISO/DIS 15380 green hydraulic oil quality standard in June 2000. The green hydraulic oil is divided into four series: ①HETG, environmentally acceptable triglyceride; ②HEPG, environmentally acceptable polyether; ③HEES, environmentally acceptable synthetic ester; ④HEPR, environmentally acceptable polya-olefin synthetic oil, etc. 4 series . Each series contains 4 viscosity grades of No. 22, No. 32, No. 46 No. 68.

There is no uniform standard for green hydraulic oil products in the world, the biodegradation rate is generally required to be greater than 80%.

Green hydraulic oil mainly investigates biodegradability toxicity.

The type of biodegradation test is divided into ① attenuation test, ② indirect test ③ continuous test.

AFNOR-T-90-302, CEC-L-33-T-93, CLOSEDBOTTLE, etc. are commonly used in the attenuation test;

The indirect test has SCAS method;

There are ROLL-ROHREN KARLSRUHER methods for continuous testing.

(to be continued)

Author: Li Yunpeng, Research Institute of Petrochemical Sciences, professor, senior engineer, graduate tutor, joined the Academy of Petroleum Sciences after graduating Nankai University in 1987, engaged in the research development of lubricants additives for nearly 30 years, published papers in academic journals at home abroad More than 70 articles, 15 invention patents, the leading research development products won the ministerial first prize of science technology once, several other awards.