Silicone caulking material for concrete expansion joints of ballastless tracks and preparation method thereof

A ballastless track and caulking material technology, applied in the direction of chemical instruments and methods, other chemical processes, adhesive additives, etc., can solve the problems of poor deep curing performance of caulking materials, non-curing performance of materials, and easy "wrinkling" on the surface , to achieve the effect of improving deep curing performance, improving storage stability, and reducing surface "wrinkles"

Active Publication Date: 2014-08-27
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Asphalt caulking materials have the advantages of easy availability of raw materials and low cost, but there are many disadvantages: such as complex construction process, need to be heated before use; poor temperature adaptability, easy to become brittle at low temperature, easy to flow and extrude at high temperature ; Poor aging resistance, short service life, etc.
Most polyurethane caulking materials are two-component packaging, which needs to be measured and mixed on site. It is easy to cause the material to not cure or the performance after curing to meet the requirements due to measurement errors or uneven mixing; the temperature sensitivity is high, and the condition of low temperature (≤5°C) Under low temperature, the curing speed is slow, which has a great influence on the caulking effect
The failure of the caulking material will lead to the loss of the waterproof function of the joints of the ballastless track structure, and water will enter the interior of the ballastless track structure from the joints, which wil

Method used

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  • Silicone caulking material for concrete expansion joints of ballastless tracks and preparation method thereof
  • Silicone caulking material for concrete expansion joints of ballastless tracks and preparation method thereof
  • Silicone caulking material for concrete expansion joints of ballastless tracks and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0033] Example 1

[0034] Material composition:

[0035]

[0036] Preparation:

[0037] The above table shows the composition of raw materials in Example 1. Mix hexamethyldisilazane and plasticizer at a ratio of 1:1 by mass and stir evenly, stir at 110°C for 3 hours, cool and seal for later use; Add polydimethylsiloxane, plasticizer, filler, thixotropic agent and pigment to the vacuum kneader in sequence, and dehydrate under vacuum at 130°C for 3 hours at a speed of 30rpm to obtain the base rubber; put the base rubber into three-roll grinding Grind on the machine to a fineness of 45 μm, and cool to room temperature; put the ground rubber base into a power mixer, use a planetary paddle at 60 rpm, and a dispersing paddle at a speed of 500 rpm, vacuumize and stir at room temperature for 12 minutes, and cool with condensed water as needed. Make sure that the temperature of the base rubber is below 50°C; add the crosslinking agent, chain extender and deep curing agent in seque...

Example Embodiment

[0039] Example 2

[0040] Material composition:

[0041]

[0042]

[0043] Preparation:

[0044]The above table shows the composition of raw materials in Example 2. Mix vinyltrimethoxysilane and plasticizer at a ratio of 1:1 by mass and stir evenly, stir at 110°C for 3 hours, cool and seal for later use; Add dimethyl siloxane, plasticizer, filler, thixotropic agent and pigment into the vacuum kneader in sequence, and dehydrate under vacuum at 140°C for 3 hours at a speed of 30rpm to obtain the base rubber; put the base rubber into the three-roll mill Grind to a fineness of 30 μm, and cool to room temperature; put the ground rubber into a dynamic mixer, use a planetary paddle at 40 rpm, and a dispersing paddle at a speed of 350 rpm, vacuumize and stir at room temperature for 10 minutes, and cool with condensed water as needed to ensure The temperature of the base glue is below 50°C; add the crosslinking agent, chain extender and deep curing agent in turn, vacuumize and ...

Example Embodiment

[0046] Example 3

[0047] Material composition:

[0048]

[0049]

[0050] Preparation:

[0051] The above table shows the composition of raw materials in Example 3. Mix magnesium chloride and plasticizer at a ratio of 1:1 by mass and stir evenly, stir at 140°C for 3 hours, cool and seal for later use; mix α,ω-dihydroxy polydimethylsiloxane Alkanes, plasticizers, fillers, thixotropic agents and pigments were added to the vacuum kneader in turn, and the base rubber was obtained after vacuum dehydration at 130 °C for 3 hours at a speed of 30 rpm; the base rubber was put into a three-roll mill and ground to a fineness of 30μm, cooled to room temperature; put the ground rubber base into a power mixer, with a planetary paddle of 80rpm and a dispersing paddle of 100rpm, vacuumize and stir for 8min at room temperature, and cool with condensed water as needed to ensure that the temperature of the base rubber is at 50 Below ℃; add cross-linking agent, chain extender and deep la...

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Abstract

The invention relates to a silicone caulking material for concrete expansion joints of ballastless tracks and a preparation method thereof. The caulking material is composed of the following raw materials in parts by mass: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 10-35 parts of a plasticizer, 70-120 parts of filler, 0.5-10 parts of a thixotropic agent, 6-12 parts of a crosslinking agent, 1-8 parts of a chain extender, 0.3-3 parts of an adhesion promoter, 0.1-2 parts of a catalyst, 0.005-0.5 part of a pigment, 0.5-5 parts of a storage stabilizer, and 1-3 parts of a deep curing agent. The silicone caulking material is prepared by using the preparation method disclosed by the invention. The silicone caulking material has the characteristics of good construction performance, high displacement capacity, good interface adhesion, excellent aging resistance, long storage life, good deep-layer curing performance, and the like, is suitable for being applied to concrete expansion joints of ballastless tracks of high-speed rails, expansion joints of airport pavements and cement concrete pavements, and the like, and also can be applied to the failure repair of existing expansion caulking materials.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a silicone caulking material used for ballastless track concrete expansion joints and a preparation method thereof. Background technique [0002] With the rapid development of high-speed railway network construction, ballastless track structure has become the main track structure type used in my country's high-speed railway construction. The development of ballastless track technology is one of the important measures for my country's railways to rapidly improve the level of technical equipment and realize the leapfrog development of railways. In the ballastless track structure, in order to adapt to the deformation of the concrete structure at different temperatures, it is often necessary to set an expansion joint at a certain distance. At the same time, expansion joints are also reserved at the interface between the track structure and the foundation below the line,...

Claims

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Application Information

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IPC IPC(8): C09J183/06C09J11/04C09J11/06C09J11/08C09K3/10
Inventor 李化建易忠来温浩靳昊谭盐宾谢永江
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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