High-dropping point corrosion-resistant seal wax for cable and anchor head of bridge and preparation method of the seal wax

Abstract

A high-dropping point corrosion-resistant seal wax for cables and anchor heads of bridges is a mixture composed of the following components including, by weight, 35-60 parts of oxidized polyethlene wax, 8-22 parts of candelilla wax, 4-12 parts of oleic acid, 10-35 parts of polyolefin resin, 2-7 parts of a compatibilizer, 5-15 parts of Vaseline, 3-20 parts of liquid rubber, 2-6 parts of antioxidant, 1-5 parts of a defoamer, and 4-15 parts of an antirust agent. A preparation method comprises: successively adding the components into a heating container, and maintaining a certain temperature and stirring the mixture. The high-dropping point corrosion-resistant seal wax is good in defoaming effect, is high in dropping point, is high temperature resistant, has great sealability, is low in shrinking percentage, is high in attachment force, has great weather resistance and is long in corrosion-resistant period; therefore, the seal wax has long-acting protective effect on the cables and anchorheads of bridges, and other steel members, thus prolonging the service life thereof.

Description

technical field [0001] The invention relates to an anti-corrosion and anti-corrosion sealing material and a preparation method thereof, in particular to a high drop point anti-corrosion sealing wax suitable for anti-corrosion of bridge cables and anchor heads and a preparation method thereof. Background technique [0002] As the core component of the bridge, the cable is affected by wind and rain vibration, load vibration, and aging of the sealing material, and the waterproof measures are prone to failure, so that the lower cable guide and the lower anchor head are easy to enter water, resulting in metal corrosion. The most common disease, and also the most serious disease, is the main reason leading to early replacement of cables or even broken cables across bridges, which has brought huge economic losses to the society. At present, in order to solve this problem, the industry mainly pours soft or easy-to-clean anti-corrosion materials into the anchor head, such as polyuret...

AI Technical Summary

Problems solved by technology

During the vibration of the cable, the polyurethane foaming agent is easily destroyed and has a certain degree of water absorption, so that the entire anchor head component is in a humid environment for a long time; non-vulcanized sealant products are prone to plasticizer migration during use , so that its service life is shortened; anti-corrosion grease has good anti-rust performance, but the stability of anti-corrosion grease is not good, especially in summer, it is easy to separate oil, which not only weakens the protective effect, but also causes oil pollution to bridge components; anti-rust wax The antirust effect is good, but most of the antirust waxes on the market are used for ordinary steel or automobiles. This type of wax is used on bridge cables and anchor heads, and there are certain problems, such as steel under high temperature environment. The net oil content is relatively high, and it is easy to cause leakage due to oil separation; the shrinkage rate is too large, it is easy to shrink and sag during the cooling process, and it must be filled twice before it can be completely filled; the solvent-based wax is poured into the cableway pipe for a long time. The solvent contained in it cannot be volatilized and solidified, and the volume shrinkage becomes smaller after the solvent volatilizes and solidifies, so that some metal components are directly exposed to the corrosive environment

In addition, during the vibration process of the cable, the hardness of the wax is too large or the adhesion is poor, it is easy to separate it from the steel strand, forming a hole in the center of the cable, and even causing the wax to crack, and finally the expected protective effect cannot be achieved.

[0003] In order to solve the above-mentioned problems in the prior art, the invention patent with the patent publication number of CN105542490A provides a kind of anti-corrosion sealing wax suitable for bridge cable and anchor head anticorrosion and its preparation method. The anti-corrosion sealing wax is mainly composed of microcrystalline wax As a base material, it has the characteristics of low shrinkage, high adhesion, and long corrosion resistance period, but the disadvantage is that the product has poor temperature resistance, the highest dropping point is only 92 ℃, and the scope of use is limited.

In summer, the temperature in the tropics is high, the sunshine time is long, and the sun directly shines on the bridge deck and the cables. Due to the strong heat absorption and conductivity of concrete and steel, the local temperature can be as high as 90°C, which makes the corrosion-resistant sealing wax prone to decomposition at this temperature for a long time. Oil phenomenon, limited geographical range of use

In addition, due to the particularity of the construction process of the bridge cable and anchor head protection project, the wax is melted first, and then transported to the anchor head filling point several meters away with a high-pressure pump, and then poured into the pipeline several meters deep. In order to reduce the shrinkage of the wax in the technology, inorganic fillers are added, so that if the wax is heated and melted during construction and poured for a long time, the filler will sink. If the construction personnel do not stir before spraying, the quality of the product will be affected. And cause blockage to the spraying equipment; In addition, during the pouring process, the wax is easy to cool down when it is cooled, and the bubbles generated during the pouring process cannot be completely eliminated.

Wax foam floating on the surface, reducing the intended protective effect

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