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] Chin

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

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Example Embodiment

[0031] Example 1

[0032] An interface agent for polyurethane caulking materials for high-speed railway ballastless tracks and a preparation method thereof, including the following steps:

[0033] Dehydration treatment: the fatty acid dimer diol, polyether ester diol and tetrahydrofuran copolyether diol were dehydrated under vacuum (vacuum degree ≤ -0.09MPa) at 120°C to a water content ≤ 0.05%, and stored in a cool and sealed manner.

[0034] Prepolymer preparation: Put 30 parts of TDI trimer into the reactor, heat to 85°C, and start to add 35 parts of fatty acid dimer diol, 15 parts of polyether ester diol and 15 parts of tetrahydrofuran copolyether diol. After 1.5h, the dripping is finished, the temperature is raised to 90℃, after 0.5h of reaction, the NCO group content is tested every 0.5h, until its value is 16%, add N-β(aminoethyl)- 5 parts of γ-aminopropyltrioxymethylsilane, after continuing the reaction for 1 h, test the NCO group content every 0.5 h until the value is 12%, a...

Example Embodiment

[0036] Example 2

[0037] An interface agent for polyurethane caulking materials for high-speed railway ballastless tracks and a preparation method thereof, including the following steps:

[0038] Dehydration treatment: the fatty acid dimer diol, polyether ester diol and hydrogenated hydroxy-terminated polybutadiene are dehydrated under vacuum (vacuum degree≤-0.09MPa) to water content ≤0.05% at 120°C, and stored under cooling and sealing.

[0039] Prepolymer preparation: Put 25 parts of MDI-100 into the reactor, heat to 80°C, and start to add 25 parts of fatty acid dimer diol, 20 parts of polyether ester diol and 20 parts of tetrahydrofuran copolyether diol. After 2h, the dripping is finished, the temperature is raised to 85℃, after 0.5h of reaction, the NCO group content is tested every 0.5h, until its value is 14%, add N-β(aminoethyl)-γ- 10 parts of aminopropyl trioxyethyl silane, after continuing the reaction for 1 h, test the NCO group content every 0.5 h until the value is 10%,...

Example Embodiment

[0041] Example 3

[0042] An interface agent for polyurethane caulking materials for high-speed railway ballastless tracks and a preparation method thereof, including the following steps:

[0043] Dehydration treatment: dehydration of fatty acid dimer diol, polyether ester diol, tetrahydrofuran copolyether diol and hydrogenated hydroxy-terminated polybutadiene at 120°C under vacuum (vacuum degree ≤-0.09MPa) to water content ≤0.05 %, cool and seal for storage.

[0044] Prepolymer preparation: Put 10 parts of MDI-100 into the reactor, heat to 80°C, start to add 10 parts of polyether ester diol and 10 parts of tetrahydrofuran copolyether diol one by one. After 2 hours, the addition is complete, and the temperature Raise to 85℃, after reaction 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 the reaction for 1 h, test the NCO group content every 0.5 h until the value is 11%, and store at a low...

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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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