Characteristics of special lubricant for food machinery
As the special lubricant for food machinery is specially designed for food machinery formula, and in the food processing industry, the working environment of food machinery is complex and diverse, which puts forward higher requirements for mechanical lubrication and food safety protection, such as: withstand high temperature or low temperature, high humidity; To carry an impact or large load; Inhibit the growth of microorganisms and bacteria to ensure food safety and hygiene.
For the above requirements, the professional lubricant of food machinery should have very good oxidation resistance, high and low temperature resistance and anti-emulsification performance. For the impact load and large load of some machines, lubricants also have excellent extreme pressure. For food processing machinery which is easy to breed bacteria and microorganisms, lubricants should also have good anti-microbial reproduction characteristics.
For example, if lard, peanut and salad oil are used to lubricate food machinery, there will be many problems. First of all, its lubrication performance is far less than professional lubricants, in the case of impact load or large load is difficult to meet the lubrication requirements. Secondly, these animal and vegetable oils in high temperature, high humidity environment use easily moldy deterioration, produce toxic and harmful substances and pollution of food; These oils will solidify at low temperatures and will not provide good lubrication.
In short, the biggest difference between special lubricants and ordinary lubricants for food machinery is that their components, including base oils and additives are required to be non-toxic and harmless, even accidental contact with food will not contaminate food, to ensure the safety and health of food production.
Composition of lubricating fluid for food machinery
Special lubricants for food machinery are mainly divided into: lubricating oil, grease. Lubricating oil is mainly composed of base oil and additives. Grease is mainly composed of base oil, thickener and additive.
As the special lubricant for food machinery is used in the food industry, so the requirements for lubricants are very strict, not only to meet the mechanical lubrication, but also can not affect food safety.
1. The base oil
The base oil is usually refined mineral oil (white oil) from hydrocracking, which is characterized by its purity, less sulfur and aromatic components, less water content, and less oxidation and emulsification. Such as hydrocracking refined mineral oil, its chain saturated hydrocarbons accounted for more than 99%, and no aromatic hydrocarbons, sulfur content is less than 10ppm. However, for mineral oil extracted with ordinary solvent, only 65% ~ 75% of its chain hydrocarbons and 25% ~ 35% of its aromatic hydrocarbons, with sulfur content of 13 ~ 15000ppm.
In addition, common base oils are polyalphaolefins (PAO). This is a synthetic base oil, pure and simple, no sulfur and aromatic components, with natural hydrophobic properties and temperature resistance and antioxidant properties. Synthetic base oils, oil molecules can be artificially designed to a certain size and structure, the composition is single, in the microstructure does not give oxidants and water to combine space.
In general, the base oil of the special lubricant for food machinery must have very good oxidation resistance, high and low resistance and anti-emulsification performance, long service life, can reduce the wear of the equipment, extend the service life of the equipment, and reduce the maintenance frequency. At the same time, it does not contain toxic substances and will not cause pollution to the products.
2. The additives
Additives can significantly improve some special properties of lubricating grease, or give it some properties that it does not have. In high performance lubricants, especially many artificial super high performance lubricants, the number and variety of additives are less than ordinary lubricants, or even without additives. And for many ordinary lubricant additives, such as antioxidants, extreme pressure additives, oily agents, etc., these additives performance is good, but often have a certain toxicity, not suitable for the lubrication of food machinery.
In addition, because the food mechanical lubrication is mainly used in depth refined white oil, but the oil to load large or impact load of the lubrication site, its lubrication properties can not meet the requirements, so you need to add oil agent or extreme pressure agent. Oilers often use animal and vegetable oils such as whale oil or castor oil, while extreme pressure agents may use materials approved by FDA or USDA, such as polyalkyl glycol.
3. The thickener
Lubricating grease is prepared with thickener such as composite aluminum base, composite calcium base and base oil. From the appearance of white or milk white, and these thickener must be non-toxic, odorless, tasteless. All the raw materials should adopt the safety components stipulated in pharmacopoeia or pharmacology.
From this point of view, to improve the performance of special lubricants for food machinery, we can start from two aspects, one is to use superior performance of the base oil; The second is to develop non-toxic additives and thickeners suitable for lubrication of food machinery.
With the progress of science and technology and the development of food processing industry, will put forward higher requirements of food machinery lubrication, this requires that the special lubricating oil food machinery in the future to have a higher quality of base oil and additive performance, all PAO synthetic base oil and non-toxic harmless professional food machinery lubrication additives will become the future trend of development.