What is lubricating grease made of?Its raw materials include three parts, one is the base oil, the second is thickening agent, the third is additive.The so-called base oil generally refers to the refined and dewaxed petroleum fractions to a certain quality standard.For grease with special requirements, it is also necessary to use liquid organic compounds containing oxygen, silicon or fluorine as the base oil.Thickeners are mainly fatty acid salts, also known as soaps, which thicken the base oil into a semisolid jelly.We commonly used soap is the sodium salt of fatty acids, because sodium salt is easily soluble in water, so generally not sodium soap to make grease thickener, the actual use is more calcium soap of fatty acids, in addition to lithium soap, barium soap and aluminum soap.Silicone structural adhesive
These soaps have their own characteristics, some are resistant to high temperature, some are resistant to water, some are resistant to moisture and salt spray, etc., each has its use.Sometimes according to the need to several kinds of soap compound use, the so-called additives include additives and fillers.In order to improve some properties of grease, it is generally necessary to add additives with different functions such as oxidation resistance and rust resistance.Graphite, molybdenum disulfide and other solids are sometimes added as fillers to improve the performance of grease in terms of pressure and high temperature resistance. There are many varieties of lubricating grease according to the different types of base oil, thickeners and additives as well as their content.
The difference between structural adhesive and non-structural adhesive
Structural adhesive refers to high strength (compression strength >65MPa, steel-steel tensile bonding strength >30MPa, shear strength >18MPa), can withstand large load, and aging resistance, fatigue resistance, corrosion resistance, stable performance in the expected life, suitable for bearing strong structural parts bonding.
Non-structural adhesive has low strength and poor durability, and can only be used for ordinary and temporary bonding, sealing and fixing, not for structural parts bonding.
The service life of construction projects is generally more than 50 years, and the components bear large complex stress, which is directly related to the safety of life and property of personnel. Structural adhesive should be used for bonding.Structural adhesive is widely used in engineering, mainly used for strengthening, anchoring, bonding, repair and so on;Such as sticking steel, sticking carbon fiber, planting reinforcement, crack reinforcement, sealing, hole repair, spike paste, surface protection, concrete bonding, etc.
