Preparation And Properties Of Highperformance Shield Tail Sealing Grease

Shield tail sealing grease is a commonly used sealing composite material in subway shield construction.It is used to protect the internal devices of the shield tail and prevent mud and groundwater from leaking into the shield machine through the shield tail gap.At present,the quality of shield tail sealing grease in the domestic market It is uneven and has not formed a unified test method and evaluation standard.Therefore,in response to these issues,the following work has been done on this subject.In this paper,mineral oil,wood fiber,lithium-based grease,organic bentonite,polyisobutylene,C5 petroleum resin,etc.are used as the main raw materials,and the physical kneading method is used to prepare high water pressure resistance,high pumpability,and high Adhesive shield tail sealing grease material.The content and length of wood fiber,mineral oil,lithium-based grease,organic bentonite,mineral oil,lithium-based grease,organic bentonite,The influence of the content of poly isobutylene and C5 petroleum resin on the performance of shield tail sealing grease.At the same time,the difference in performance of the shield tail sealing grease between vegetable oil base,animal oil base oil and mineral oil base oil is compared,and the shield tail seal is designed and self-made Grease adhesion,water impact resistance,and water tightness testing device.Concluded as follow:(1)Select mineral oil,wood fiber,lithium-based grease,organic bentonite,polyisobutylene,and C5 petroleum resin as the main components of the shield tail sealing grease,and adjust the content of each component to prepare a series of shield tail sealing greases.It was finally determined that when mineral oil is 240 parts,wood fiber is 30 parts,lithium-based grease is 20 parts,organic bentonite is 20 parts,polyisobutylene is 140 parts,and C5 petroleum resin is 65 parts,the overall performance of shield tail sealing grease is the best..At this time,the penetration of the shield tail sealing grease is 212.4,the pumpability is 62.5g/min,and the shield tail sealing grease can withstand the high water pressure of 3.5MPa;the adhesion is 0cm when the grease adheres to the steel plate within 10 minutes.The percentage of water impact resistance is 0.737%,and the loss of water impact resistance is 0.018g.(2)In order to further improve the environmental performance,a highperformance environmentally friendly shield tail sealing grease was prepared with soybean oil instead of mineral oil.The comprehensive performance of soybean oil-based shield tail sealing grease is better than mineral oil-based shield tail sealing grease and animal oil-based shield tail sealing grease.When the soybean oil-based shield tail seal oil component content is the same,the cone penetration is 251.6,the pumpability is 75.6g/min,the water-resistant seal can withstand 3.5MP high water pressure,and the adhesion is within 10 minutes.The sliding displacement of the attached steel plate is 0cm,the water impact resistance percentage is 0.552%,and the water impact loss is 0.011g.