Interface agent for high-speed railway ballastless track polyurethane caulking material and preparation method thereof

A technology of caulking material and ballastless track, which is applied in the field of building materials, can solve problems such as poor bonding strength, high material viscosity, and falling off, and achieve the effects of small material performance deviation, high bonding strength, and strong wetting ability

Active Publication Date: 2014-12-03
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many single-component polyurethane interface agents, but there are still the following problems in the application of high-speed railway ballastless track expansion joints: (1) The bonding substrates are mostly glass, ceramics, metals, organic polymers, wood, etc. , does not match the concrete interface; (2) the viscosity is high, the thickness of the coating is not easy to control, and it is easy to foam; (3) the curing time is long, the early bonding strength is poor, and even the bonding surface does not cure for a long time; (4) The material is brittle, and it is easy to break and fall off after long-term use; (5) The resistance to ultraviolet aging, heat aging and hydrolysis is poor
[0004] Chinese patent CN102140304A "A interface agent for polyurethane sealant and its preparation method" discloses a one-component polyurethane interface agent, which improves the bonding performance and aging resistance of the material through modification of epoxy resin, but introduces After epoxy resin, the viscosity of the material is high and the brittleness is relatively large. Under the action of long-term dynamic load and temperature force, it is easy to fall off or have a gap
The molecular chain structure of the isocyanate prepolymer prepared by this method is difficult to control, the molecular weight dispersion is large, and the molecular chain structure of the prepolymer produced in different batches is quite different.

Method used

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  • Interface agent for high-speed railway ballastless track polyurethane caulking material and preparation method thereof
  • Interface agent for high-speed railway ballastless track polyurethane caulking material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A high-speed railway ballastless track polyurethane caulking material interface agent and preparation method thereof, comprising the following steps:

[0033] Dehydration treatment: dehydrate the fatty acid dimer diol, polyether ester diol and tetrahydrofuran copolyether diol in vacuum (vacuum degree ≤ -0.09MPa) at 120°C to water content ≤ 0.05%, and cool down and seal for storage.

[0034] Preparation of prepolymer: put 30 parts of TDI trimer into the reaction kettle, heat to 85°C, start to drop 35 parts of fatty acid dimer diol, 15 parts of polyether ester diol and 15 parts of tetrahydrofuran copolyether diol After 1.5 hours, the dropwise addition was completed, and the temperature was raised to 90°C. After reacting for 0.5 hours, the NCO group content was tested every 0.5 hours until the value was 16%, and N-β (aminoethyl)- 5 parts of γ-aminopropyltrioxymethylsilane, after continuing to react for 1 hour, test the NCO group content every 0.5 hours until the value is 1...

Embodiment 2

[0037] A high-speed railway ballastless track polyurethane caulking material interface agent and preparation method thereof, comprising the following steps:

[0038] Dehydration treatment: Dehydrate fatty acid dimer diol, polyether ester diol and hydrogenated hydroxyl-terminated polybutadiene at 120°C in vacuum (vacuum degree ≤ -0.09MPa) to water content ≤ 0.05%, cool down and seal for storage.

[0039] Preparation of prepolymer: Put 25 parts of MDI-100 into the reaction kettle, heat to 80°C, and start to drop 25 parts of fatty acid dimer diol, 20 parts of polyether ester diol and 20 parts of tetrahydrofuran copolyether diol in sequence After 2 hours, the dropwise addition was completed, and the temperature was raised to 85°C. After reacting for 0.5 hours, the NCO group content was tested every 0.5 hours until the value was 14%, and N-β (aminoethyl)-γ- 10 parts of aminopropyltrioxyethylsilane, after continuing to react for 1 hour, test the NCO group content every 0.5 hours unt...

Embodiment 3

[0042] A high-speed railway ballastless track polyurethane caulking material interface agent and preparation method thereof, comprising the following steps:

[0043] Dehydration treatment: Dehydrate fatty acid dimer diol, polyether ester diol, tetrahydrofuran copolyether diol and hydrogenated hydroxyl-terminated polybutadiene at 120°C in vacuum (vacuum degree ≤ -0.09MPa) to water content ≤ 0.05 %, cooled and sealed for storage.

[0044] Preparation of prepolymer: Put 10 parts of MDI-100 into the reaction kettle, heat to 80°C, start to add 10 parts of polyether ester diol and 10 parts of tetrahydrofuran copolyether diol dropwise in sequence, and after 2 hours, the dropwise addition is completed. Rising to 85°C, after reacting for 0.5h, test the NCO group content every 0.5h, until the value is 15%, add N-β(aminoethyl)-γ-aminopropyltrioxyethylsilane 1 After continuing to react for 1 hour, test the NCO group content every 0.5 hours until the value is 11%, and then cool down and s...

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Abstract

The invention relates to an interface agent for a high-speed railway ballastless track polyurethane caulking material and a preparation method thereof. The interface agent comprises the following raw materials in parts by weight: 100 parts of isocyanate prepolymers, 80-120 parts of solvents, 0.1-0.5 part of catalysts, 0.5-2.5 parts of water removal agents and 0.5-2.5 parts of anti-aging agents. The preparation method comprises the following two steps of: (1) slowly dripping polyhydric alcohol to isocyanate at the temperature of (85+ / -5) DEG C, then increasing the temperature to (90+ / -5) DEG C for continuous reaction, when the content of NCO groups is 14%-16%, adding organic silicon coupling agents, and reacting till the content of the NCO groups is 10%-12% so as to obtain a prepolymer; (2) adding the solvents, the catalysts, the water removal agents and the anti-aging agents to the prepolymer, uniformly stirring, and debubbling in vacuum (at vacuum degree less than or equal to -0.09MPa) to obtain the interface agent for the polyurethane caulking material. The interface agent disclosed by the invention has the characteristics of low viscosity, good impregnation property, high toughness, excellent hydrolysis-resistant property and alkali-resistant property, excellent adhesive property with concrete and the polyurethane caulking material, and the like.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an interface agent for polyurethane caulking materials for ballastless tracks of high-speed railways and a preparation method thereof. Background technique [0002] At present, polyurethane caulking materials have been widely used in ballastless track structures of high-speed railways. Since the base slab and ballast slab of the high-speed railway ballastless track are long continuous pouring structures, affected by the temperature force and the dynamic load of the train, the displacement of the expansion joints set is large. According to the on-site test results and combined with theoretical calculations, the base The maximum deformation of the seam can reach more than 40%. Therefore, the polyurethane caulking material and concrete should have excellent bonding properties to prevent material degumming caused by large shrinkage, resulting in seam separation, and eve...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08G18/79C08G18/76C08G18/66C08G18/48C08G18/12C08G18/62
Inventor 李化建易忠来靳昊谭盐宾谢永江温浩
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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