Seal wax composition for train end connector of motor train unit and preparation method thereof

Abstract

The invention discloses a seal wax composition for a train end connector of a motor train unit. The seal wax composition comprises the following components in percentage by weight: 62-70% of wax material, 1-10% of tackifier, 15-25% of fire retardant, 5-15% of hydroxyl-terminated polydiorgaonsiloxane polymer, 1-5% of siloxane cross-linking agent and 0.1-3% of catalyst. The invention also discloses a preparation method of the seal wax composition. The seal wax composition prepared by the method contains no solvent and has good initial adhesion and favorable sealing, waterproofing, insulating and antiflaming properties; and the seal wax composition does not flow at the high temperature of 100 DEG C and does not crack at the low temperature of -35 DEG C, is in a paste state at room temperature and can be filled in a hose with a sharp mouth to be extruded, thereby facilitating construction. More importantly, the surface of the wax coating is not tacky and can become properly tackier along with elapse of time; the surface of the wax coating is in a plastic or rubber state, but the inside of the wax is still in a semi-solid state; and the original signal line can be replaced with a new one by simply removing the wax around the signal line and then refilling the seal wax.

Description

technical field [0001] The invention relates to a sealing wax composition, in particular to a sealing wax composition used for a train end connector of an EMU and a preparation method thereof. Background technique [0002] The sixth major speed increase of China's railways, all the EMUs (Harmony) on the line, formerly known as CRH series, CRH is the abbreviation of China Railway High-speed (China Railway High-speed), imported from Japan, Germany, France and other countries Advanced technology, assimilation and localization, has become the EMU product series with "my country's independent intellectual property rights", and the current technology belongs to the international leading level. At present, there are more than 80 CRH3 EMU trains in operation in China, and the high-speed rail project under construction now has set a world record in the test speed of the train, reaching 487 km / h. Dozens of signal lines between the two cars of the EMU are connected through the car-end ...

AI Technical Summary

Problems solved by technology

[0013] Among the existing sealing materials, there are many types of patented product introductions, but none of them can meet all the above requirements:

[0014] The first category: pre-installation is required. If it is replaced midway, the original sealing material will be destroyed.

For example, the patent "ZL200410005103.3 A halogen-free low-density fireproof sealing material" is suitable for fireproof sealing of building holes, cable trays of warships, ships, and aircraft; the patent "(application number) 94111223.3 Insulation and sealing of low-voltage wire busbars and various electrical exposed joints; patent "(Application No.) 200910144745.4 A non-toxic and fireproof rubber sealing strip for rail vehicle doors and windows and its preparation method", which is suitable for the sealing of rail vehicle doors and windows; patent "(Application No.) 200680014622.3 Sealing material and its method of use", this type of sealing material is well bonded and sealed, but usually it can only be used once in advance, and all subsequent replacements must be re-sealed

[0015] The second category: no structural strength or insufficient structural strength when used

Such as the patent (90102223.3) "Filling thixotropic optical cable filler at room temperature and its preparation", waterproof, sealed, insulated, and easy to use, but it cannot be cured and has no structural strength. When the train accelerates, under the action of inertia, the sealing strength of the paste is not enough. , it will break away from the sealing position and lose its waterproof effect, so it is not suitable as a sealing material for the EMU car end connector

[0016] The third category: too much structural strength and too strong adhesion

Such as adhesive, when used, it will pollute other materials in contact, and after curing, the signal line is fixed in the connector module and cannot be replaced. If it is hot melt adhesive, it needs to be heated and melted before use, which will damage the signal line

[0017] The fourth category: Insufficient adhesive force, easy to delaminate and lose sealing effect during vibration

[0020] In the prior art, there are also some wax compositions that play a role in protection and sealing. For example, the Chinese patent (ZL97116401.0) "A Wax Composition for Automobile Inner Cavity Protection and Its Preparation Method" consists of wax, resin, wax film improver, anti-corrosion It is composed of rust agent, thixotropic agent and solvent. It is thixotropic. The formed wax film is flexible and dense, and is not easy to crack. However, this wax contains solvents and flows during construction, so it cannot be filled on the facade. There is flow at 80°C, so it is not suitable as sealing wax for EMU car end connectors; Chinese patent (ZL200410042842. The wax composition for sealing cracked pills can be used to prepare waterproof products, and can also be used for electrical insulation wax, but it needs to be heated and filled. First, the signal line is not suitable for high temperature. Mention of flame retardancy

Therefore, they are not suitable as sealing wax for EMU car end connectors.

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