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Method for preparing polyurethane adhesive

A technology of polyurethane adhesive and hydroxyl-terminated polyurethane, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of low bonding strength, poor storage stability, slow curing speed, etc., and achieve high curing speed Fast, good elasticity, convenient construction effect

Inactive Publication Date: 2010-09-22
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One-component adhesives are easy to use, but have disadvantages such as poor storage stability, slow curing speed, and low bonding strength; two-component adhesives are the first choice for adhesives used in the "two cloths and one film" technology due to their fast curing speed and high bonding strength , but most of the adhesives used in the "two cloths and one film" technology are converted from adhesives in other fields, and there is no adhesive specially used in the "two cloths and one film" technology in the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment 1 provides a preparation method of a polyurethane adhesive to prepare an adhesive suitable for the "two cloths and one film" technology of high-speed railway ballastless track, which is applied to the sliding layer of ballastless track. The polyurea waterproof layer, geotextile and high-strength extruded board all have good bonding effects. The preparation method specifically includes:

[0024] Preparation of hydroxyl-terminated polyurethane prepolymer:

[0025] The raw materials for preparing the hydroxyl-terminated polyurethane prepolymer are calculated by mass percentage, including:

[0026] 10-25% plasticizer, 60-80% trifunctional polyether polyol and 5-15% diphenylmethane diisocyanate;

[0027] Add the plasticizer, trifunctional polyether polyol and diphenylmethane diisocyanate into the synthesis reaction kettle, raise the temperature to 60-80°C, and react for 3-5 hours. After the synthesis reaction is completed, the hydroxyl-terminated polyurethan...

Embodiment 2

[0042] This embodiment 2 provides a preparation method of a polyurethane adhesive to prepare an adhesive suitable for the "two cloths and one film" technology of high-speed railway ballastless track, which is applied to the sliding layer of ballastless track. The polyurea waterproof layer, geotextile and high-strength extruded board all have good bonding effects. The preparation method specifically includes:

[0043] Preparation of hydroxyl-terminated polyurethane prepolymer:

[0044] Get raw materials according to the following ratio:

[0045] Raw material ratio (parts by mass)

[0046] Polyether triol (molecular weight 350) 62

[0047] Dioctyl phthalate 25

[0048] Diphenylmethane diisocyanate 13;

[0049]Add 25 parts by mass of dioctyl phthalate and 65 parts by mass of polyether trihydric alcohol into the synthesis reactor, raise the temperature to 50°C, turn off the heating, and quickly add 13 parts by mass of diphenylmethane diisocyanate Add it into the synthesis rea...

Embodiment 3

[0095] This embodiment three provides a preparation method of a polyurethane adhesive to prepare an adhesive suitable for the "two cloths and one film" technology of high-speed railway ballastless track, which is applied to the sliding layer of ballastless track. The polyurea waterproof layer, geotextile and high-strength extruded board all have good bonding effects. The preparation method specifically includes:

[0096] Preparation of polyurethane prepolymer:

[0097] Get raw materials according to the following ratio:

[0098] Raw material ratio (parts by mass)

[0099] Polyether triol (molecular weight 800) 71

[0100] Diisononyl phthalate 17

[0101] Diphenylmethane diisocyanate 12;

[0102] Preparation method: Add 17 parts by mass of dioctyl phthalate and 71 parts by mass of polyether triol into a synthesis reactor, raise the temperature to 50°C, turn off the heating, and add 12 parts by mass of diphenylmethane The diisocyanate is quickly added to the synthesis react...

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Abstract

The invention provides a method for preparing polyurethane adhesive, comprising the following steps: compounding small-molecule chain extender, inorganic filler, organosilicon coupling agent and hydroxyl-terminated polyurethane prepolymer which is synthesized from the reaction of trifunctional polyether glycol, methylene diphenyl diisocyanate and plasticizer under a certain condition to obtain the first component of the polyurethane adhesive, and compounding the first component and the second component of polyisocyanate proportionally to obtain the polyurethane adhesive. Due to the structuraldesign of the hydroxyl-terminated polyurethane prepolymer, the selection of the small-molecule chain extender, the proportioning adjustment of the inorganic filler and the match of the appropriate curing system, the prepared polyurethane adhesive has the advantages of rapid curing speed, convenient construction and good adhering effect on the concrete slab, the polyurea waterproof layer, the geotextile and the high-strength extruded sheet without the application of any base glue and can fully reach the standard of the unballasted track sliding layer technology and normalize the technology of two geotextile and one geo-membrane which are suitable for the unballasted high-speed railway track sliding layer.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a method for preparing a polyurethane adhesive suitable for two cloths and one film for ballastless tracks of high-speed railways. Background technique [0002] With the current pace of domestic infrastructure construction and development accelerating, many high-speed railway passenger dedicated lines have adopted a large number of advanced techniques and cutting-edge technologies (such as ballastless track technology) in the construction process. The development of high-speed railways in the world has proved that if the conventional track system is used for high-speed railway foundation projects, the ballast will be severely pulverized, the line maintenance will be frequent, and the safety, comfort and economy will be relatively poor. Adopting ballastless track technology, the stability and comfort of high-speed trains are at an excellent level, and all the test data are withi...

Claims

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Application Information

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IPC IPC(8): C09J175/08
Inventor 刘滨
Owner BEIJING COMENS NEW MATERIALS
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