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Polyurethane caulk compound for high-speed railway and preparation method for polyurethane caulk compound

A high-speed railway and polyurethane technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems that it is difficult to meet the long service life of caulking materials, and avoid water absorption cracking and low temperature embrittlement , high strength, good flexibility and elongation effect

Active Publication Date: 2015-12-09
JIANGSU CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The service life of ordinary polyurethane caulk is only 3 to 5 years, which is difficult to meet the requirements of long service life of caulking materials

Method used

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  • Polyurethane caulk compound for high-speed railway and preparation method for polyurethane caulk compound
  • Polyurethane caulk compound for high-speed railway and preparation method for polyurethane caulk compound
  • Polyurethane caulk compound for high-speed railway and preparation method for polyurethane caulk compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The polyurethane caulk of the present invention consists of two components, A and B.

[0033] Preparation of Component A: Add 100 parts of low unsaturation and high molecular weight polyether polyol into the reactor, stir, heat up to 110°C, vacuum dehydrate for 2 hours, cool down to below 60°C, add 25 parts of diphenylmethane For diisocyanate (MDI), heat up to 75°C and react for 2-3h. When the NCO content of the measurement system reaches a predetermined value, the reaction is stopped. After the reaction is completed, the temperature is lowered and vacuum defoamed for 30 minutes, and the material is discharged to obtain a polyurethane prepolymer, which is the A component.

[0034] Preparation of component B: 100 parts of low unsaturation and high molecular weight polyether polyol, 3 parts of fluorine-containing polyol, chain extender 3,3'-dichloro-4,4'- 12 parts of diamino-diphenylmethane, filler, stir and disperse evenly, heat to 110°C, and vacuum dehydrate for 1 hou...

Embodiment 2

[0040] The polyurethane caulk of the present invention consists of two components, A and B.

[0041]Preparation of component A: Add 20 parts of polycaprolactone diol and 80 parts of polyether polyol with low unsaturation and high molecular weight into the reaction kettle, stir, raise the temperature to 110°C, vacuum dehydrate for 2 hours, and cool down to below 60°C. Add 30 parts of toluene diisocyanate (TDI), raise the temperature to 80°C, and react for 2-3 hours. When the NCO content of the measurement system reaches a predetermined value, the reaction is stopped. After the reaction is completed, the temperature is lowered and vacuum defoamed for 30 minutes, and the material is discharged to obtain a polyurethane prepolymer, which is the A component.

[0042] Preparation of component B: 100 parts of low unsaturation and high molecular weight polyether polyol, 5 parts of fluorine-containing polyol, chain extender 3,3'-dichloro-4,4'- 8 parts of diamino-diphenylmethane, fille...

Embodiment 3

[0048] The polyurethane caulk of the present invention consists of two components, A and B.

[0049] Preparation of component A: Add 12 parts of polycarbonate diol and 88 parts of polyether polyol with low unsaturation and high molecular weight into the reaction kettle, stir, heat up to 110°C, vacuum dehydrate for 2 hours, cool down to below 60°C, add 30 parts of diphenylmethane diisocyanate (MDI), heated to 75°C, reacted for 2-3 hours. When the NCO content of the measurement system reaches a predetermined value, the reaction is stopped. After the reaction is completed, the temperature is lowered and vacuum defoamed for 30 minutes, and the material is discharged to obtain a polyurethane prepolymer, which is the A component.

[0050] Preparation of component B: Add 100 parts of low unsaturation and high molecular weight polyether polyol, 4 parts of fluorine-containing polyhydroxy polymer, 5 parts of chain extender dimethylthiotoluenediamine, and filler into the reaction kettle...

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Abstract

The invention discloses a polyurethane caulk compound for a high-speed railway and a preparation method for the polyurethane caulk compound. The weather resistance and the low-temperature resistance of a product are higher than those of a conventional polyurethane caulk compound, and the normal service life of the product can reach more than 15 years, and the product can be widely applied to a concrete roadbed slab of a roadbed of the high-speed railway and other concrete roads and structures. The polyurethane caulk compound for the high-speed railway comprises a component A and a component B, wherein the component A comprises the following components in parts by mass: 60 to 70 parts of low-unsaturation high-molecular weight polyol and 30 to 40 parts of aromatic isocyanate; the component B comprises the following components in parts by mass: 100 parts of low-unsaturation high-molecular weight polyol, 3 to 5 parts of a polyhydroxy fluorinated polymer, 50 to 150 parts of a filler, 3 to 5 parts of a chain extender and 0.5 to 1.0 part of a catalyst; and when the polyurethane caulk compound is used, the mass ratio of the component A to the component B is (1 to 1.0 ) to (1 to 4.0).

Description

technical field [0001] The invention relates to a caulking glue and a preparation method thereof, in particular to a polyurethane caulking glue for high-speed railways and a preparation method thereof. Background technique [0002] At present, the design of domestic high-speed railway ballastless track generally adopts double-block ballastless track, roadbed and single-hole box bridge section, and false joints and expansion joints are designed in the track bed slab unit and between the units, so that the concrete track bed slab can be exposed to the outside world. Structural damage can be avoided under conditions such as temperature changes, uneven loads, large differences in deformation of adjacent parts, and differences in foundation bearing capacity. In order to prevent the deformation and corrosion of the roadbed caused by the inflow of water from the gap, the expansion joints are often filled with caulking materials. [0003] The traditional caulking material is petrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J175/06C08G18/76C08G18/66C08G18/48C08G18/62C08G18/42C08G18/32C08G18/10C08G18/12
Inventor 张志忠李冬梅王建祝和权杜存山
Owner JIANGSU CHEM RES INST
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