Protective grease for bridge inhaul cables, and preparation method thereof

Abstract

A protective grease for bridge inhaul cables is a mixture comprising 15-28 parts by weight of polyamide resin, 12-30 parts by weight of methyl phenyl silicone resin, 8-20 parts by weight of microcrystalline wax, 3-15 parts by weight of polytetrafluoroethylene micro-powder, 5-15 parts by weight of naphthenic mineral oil, 8-20 parts by weight of a high-temperature-resistant alkaline filler, 10-25 parts by weight of a tackifier, 5-15 parts by weight of an antirust agent, 2-5 parts by weight of an antioxidant and 5-20 parts by weight of a flame retardant. A preparation method of the protective grease comprises the following steps: sequentially adding the components into a heating container, keeping a certain temperature, and stirring. The protective grease for bridge inhaul cables has the advantages of being good in stability, strong in adhesive force, strong in salt spray resistance, long in corrosion inhibition period, strong in lubricating property, not prone to combustion, good in flame retardant effect and the like, and is particularly suitable for sealing protection of the bridge inhaul cables with high requirements for flame retardant property and lubricating property.

Description

technical field [0001] The invention relates to an anti-corrosion sealing material and a preparation method thereof, in particular to a protective grease for bridge cables and a preparation method thereof. Background technique [0002] In order to solve the problem of corrosion of the steel strand of the cable, the prior art usually sprays epoxy powder or galvanizing on the outer layer of the steel strand, then applies anti-corrosion grease, and finally wraps it in a high-density polyethylene plastic sleeve. Multi-layer protection is carried out in order to achieve the goal of the designed service life of the cable system for 30 years. However, after more than ten years of general cable service, due to the influence of gravity, the anti-corrosion grease will slide from the upper end of the cable to the lower end, especially for the cable in the vertical direction. Poor, poor high temperature resistance, grease separation will occur during long-term use, this phenomenon is v...

AI Technical Summary

Problems solved by technology

However, after more than ten years of general cable service, due to the influence of gravity, the anti-corrosion grease will slide from the upper end of the cable to the lower end, especially for the cable in the vertical direction. Poor, poor high temperature resistance, grease separation will occur during long-term use, this phenomenon is very obvious in tropical areas, the seeping grease will eventually drip or penetrate to the outside of the cable structure, contaminating bridge components; In addition, once the anti-corrosion grease is in contact with water for a long time, it will emulsify and turn white; the deterioration or loss of the anti-corrosion grease caused by the above problems makes it unable to perform the expected anti-corrosion protection, which seriously affects the service life of the cable. It also has a negative impact on the project, and even causes safety accidents

The reason for its anti-corrosion failure is mainly that the anti-corrosion lubricating grease usually used in the steel strands of the cables is prepared from mineral oil (or synthetic oil) and thickeners. The products prepared by this method are mainly suitable for ordinary machinery. For lubrication and anti-rust working conditions, the oil separation amount of the steel mesh is basically about 5%, which can meet the use requirements, but the working condition of the bridge cable is outdoors for a long time in the sun and rain, high temperature and water leakage will further aggravate the oil separation, The stability of the anti-corrosion grease has become the key issue of whether the cables can be effectively protected; in addition, during the operation of the bridge, fires will inevitably occur. As the core stress-bearing components of the bridge, once the cables are damaged, the bridge may collapse , the consequences cannot be estimated

Therefore, the anti-corrosion grease used in the cable should have a certain flame-retardant function, but the current anti-corrosion grease with flame-retardant function is expensive, and the flame-retardant effect is also limited

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