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Polyurethane caulking compound applied to ballastless tracks of high-speed railways and preparation method of polyurethane caulking compound

A high-speed railway, polyurethane technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc., can solve the problems of high production cost, short service life, increased maintenance cost, etc. Good anti-displacement deformation ability, high production efficiency, easy to repair effect

Inactive Publication Date: 2018-10-02
河北金坤工程材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the physical and chemical properties of petroleum asphalt determine that it has disadvantages such as poor bonding effect, easy aging, and short service life when it is used; and for the above-mentioned normal temperature construction type caulking materials, there are also cracking resistance, poor hardening performance, and production. Defects such as high cost, short service life, and greatly increased maintenance costs

Method used

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  • Polyurethane caulking compound applied to ballastless tracks of high-speed railways and preparation method of polyurethane caulking compound
  • Polyurethane caulking compound applied to ballastless tracks of high-speed railways and preparation method of polyurethane caulking compound

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Experimental program
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Effect test

preparation example Construction

[0046] 1) Preparation of isocyanate-terminated prepolymer

[0047] A. According to the design requirements, within the range of parts by weight of the above-mentioned components, add 350 parts of polyether polyol with a water content of less than 5 / 10,000, and 7 parts of anti-aging agents 1130 and 292 respectively into the reactor. Start stirring, and heat up, raise the temperature to 65-70°C, then take 50 parts of solvent, stir evenly, add 100 parts of MDI, continue stirring for 0.5 hours; then raise the temperature to 75-80°C, and react for 1.5 hours;

[0048] B. Keep 75-80°C and add 240 parts of the aforementioned polyether polyol, then react at 80°C for 1.5 hours;

[0049] C. Add 0.5 parts of organotin catalyst, 50 parts of solvent, 50 parts of dewatering agent, 0.5 part of defoamer, 0.5 part of coupling agent, and complete the preparation of prepolymer after timing for 0.5 hours;

[0050] 2) Preparation of kneaded powder

[0051] A. According to the design requirements,...

Embodiment 1

[0059] Example 1: the isocyanate-terminated prepolymer: 15 parts; plasticizer: 20 parts; special carbon black: 0.01 part; nano calcium carbonate: 40 parts; modified calcium carbonate powder: 1 part; coupling agent: 0.1 part; organic tin catalyst: 0.01 part; dispersant: 0.1 part; solvent: 1 part; water remover: 1 part; defoamer: 0.1 part; amine catalyst: 0.1 part.

Embodiment 2

[0060] Embodiment 2: The isocyanate-terminated prepolymer of the caulking and sealing material is 17.5 parts, the plasticizer is 22.5 parts, the special carbon black is 0.03 parts, the nano-calcium carbonate is 50 parts, and the modified calcium carbonate part is 3 parts , 0.3 parts of coupling agent, 0.03 parts of organic tin catalyst, 0.3 parts of dispersant, 3 parts of solvent, 3 parts of dewatering agent, 0.3 parts of defoamer, and 0.3 parts of amine catalyst.

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Abstract

The invention relates to a polyurethane caulking compound applied to ballastless tracks of high-speed railways and a preparation method of the polyurethane caulking compound. The polyurethane caulkingcompound is prepared from an isocyanate-terminated prepolymer, a plasticizer, special carbon black, nano calcium carbonate, modified calcium carbonate powder, a coupling agent, an organic tin catalyst, a dispersant, a solvent, a water reducing agent, an anti-forming agent and an amine catalyst. The polyurethane caulking compound has the advantages of being reasonable in material component design,convenient to operate and use, low in production and maintenance cost, long in service life, good in adhesion to a base layer, good in weather resistance, low in modulus, good in elasticity, good inextensibility, good in tear resistance, good in fatigue resistance and the like.

Description

technical field [0001] The invention relates to the technical field, in particular to a polyurethane caulk applied to high-speed railway ballastless railway and its application method. Background technique [0002] At present, in the ballastless track structure of domestic high-speed railways, the base slab, bed slab, etc. are all long-line continuous pouring structures. Due to the use of this type of structure, it may be necessary to set expansion joints or false joints at each end distance during design and construction to ensure no The smoothness and stability of the ballast track, and at the same time adapt to the deformation of the concrete structure caused by changes in the external environment such as different environmental temperature changes and uneven stress. In addition, at the interface between the track structure and the closed layer of the offline foundation, elastic materials need to be used as caulking for waterproof sealing and corrosion of the track. Sele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/04C09J11/06
CPCC08K2003/265C08K2201/011C09J11/04C09J11/06C09J175/08C08K13/06C08K3/26C08K3/04C08K5/12
Inventor 郭志铅纪刚
Owner 河北金坤工程材料有限公司
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