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Water-borne epoxy composite-containing emulsified asphalt cold-recycling agent and preparation method thereof

A water-based epoxy emulsion and emulsified asphalt technology, which is used in building structures, building components, building insulation materials, etc., can solve the problems of poor storage stability, easy demulsification, and high temperature of finished products, achieve low equipment requirements, and avoid brittleness. The effect of cracking and wear resistance improvement

Active Publication Date: 2015-04-08
SHANXI PROVINCIAL RES INST OF COMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most water-soluble regenerants are latex (SBS latex, SBR latex, epoxy emulsion, acrylic emulsion, etc.) added to emulsified asphalt to form modified emulsified asphalt. The medium is in a floating state, and different degrees of segregation will occur during storage. It is difficult to achieve a homogeneous system, and the effect of modified emulsified asphalt is not good.
[0004] Chinese patent CN 102617968 A discloses a method for preparing an acrylic resin emulsified asphalt-based environmentally friendly cold recycler, which adopts the method of first modifying asphalt with acrylic acid and then emulsifying it, so that comonomers can be polymerized in asphalt and form a homogeneous system with asphalt , but this method requires high emulsification equipment; the finished product after emulsification has a high temperature, is easy to break, the asphalt particle size is large, and the storage stability is poor; and using acrylic acid modification, the prepared mixture has poor high temperature stability. Cannot be applied on top of pavement

Method used

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  • Water-borne epoxy composite-containing emulsified asphalt cold-recycling agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Synthesis of blocked waterborne polyurethane:

[0032] The first step is to prepare polyester polyol; after evacuating PEG-1000 to remove water, add adipic acid and p-toluenesulfonic acid (catalyst, 1% of the total mass), and react at 80-90°C for 3 hours to obtain terminal hydroxyl groups Polyester polyol; Second step, prepare end isocyanate group prepolymer; With above-mentioned polyester polyol and TDI (N 2 protection) in the presence of dibutyltin dilaurate catalyst (accounting for 1% of the total mass), react at 70-80°C for 2.5h; the molar ratio of adipic acid, PEG-1000 and TDI is 1:2:2.5; Three steps, the preparation of end-blocking type waterborne polyurethane; The above-mentioned terminal isocyanate group prepolymer (N 2 protection) by adding a certain amount of methyl ethyl ketone oxime and reacting at 70-80°C for 1.5h to obtain a blocked water-based polyurethane.

[0033] 2. Preparation of waterborne epoxy compound:

[0034]Utilize the shear mixing equipm...

Embodiment 2

[0042] 1. Synthesis of blocked waterborne polyurethane:

[0043] The first step is to prepare polyester polyol; vacuumize PEG-1500 to remove water, add succinic acid and p-toluenesulfonic acid (catalyst, 1% of the total mass), react at 80-90°C for 3.5h, and obtain terminal Hydroxyl polyester polyol; second step, prepare terminal isocyanate group prepolymer; above-mentioned polyester polyol and MDI (N 2 protection) in the presence of stannous octoate catalyst (accounting for 1% of the total mass), react at 70-80°C for 2h; the molar ratio of the succinic acid, PEG-1500 and MDI is 1:2.1:3; the third step, The preparation of end-blocking type waterborne polyurethane; The above-mentioned terminal isocyanate group prepolymer (N 2 protection) by adding a certain amount of methyl ethyl ketone oxime and reacting at 70-80°C for 2 hours to obtain a blocked water-based polyurethane.

[0044] 2. Preparation of waterborne epoxy compound:

[0045] Utilize the shear mixing equipment with w...

Embodiment 3

[0053] 1. Synthesis of blocked waterborne polyurethane:

[0054] The first step is to prepare polyester polyol; after vacuumizing PEG-2000 to remove water, add phthalic anhydride and p-toluenesulfonic acid (catalyst, 1% of the total mass), and react at 80-90°C for 4 hours to obtain Hydroxyl-terminated polyester polyol; second step, prepare terminal isocyanate group prepolymer; above-mentioned polyester polyol and liquefied MDI (N 2 protection) in the presence of dibutyltin dilaurate catalyst (accounting for 1% of the total mass), react at 70-80°C for 2h; the molar ratio of phthalic anhydride, PEG-2000 and liquefied MDI is 1:2.1:2.5 ; the third step, the preparation of end-blocking type water-based polyurethane; the above-mentioned terminal isocyanate group prepolymer (N 2 protection) by adding a certain amount of methyl ethyl ketone oxime and reacting at 70-80°C for 2 hours to obtain a blocked water-based polyurethane.

[0055] 2. Preparation of waterborne epoxy compound:

...

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Abstract

The invention relates to a water-borne epoxy composite-containing emulsified asphalt cold-recycling agent and a preparation method thereof. The cold-recycling agent is prepared from the following components in parts by mass: 100 parts of emulsified asphalt and 10-20 parts of water-borne epoxy composite, wherein the water-borne epoxy composite comprises a component A and a component B, the component A is prepared from the following ingredients in parts by mass: 100 parts of water-borne epoxy emulsion, 10-25 parts of waterborne blocked polyurethane, 0.5-2 parts of associated thickener and 0.5-2 parts of coupler, and the component B is prepared from the following ingredients in parts by mass: 100 parts of an amine water-borne epoxy curing agent and 10-20 parts of accelerant. Compared with the prior art, the water-borne epoxy composite-containing emulsified asphalt cold-recycling agent belongs to a homogeneous system, has an excellent low-temperature flexibility, high-temperature stability, excellent water stability, good abrasion resistance and high early strength while the strength is improved, and the mixed material has excellent pavement performances and can be directly applied to the surface layer of pavement.

Description

technical field [0001] The invention belongs to the technical field of asphalt cold regenerants, and in particular relates to an emulsified asphalt cold regenerant containing water-based epoxy compounds and a preparation method thereof. Background technique [0002] With the rapid development of highway construction in our country, the asphalt pavement that needs to be repaired every year increases rapidly. If a large amount of excavated and milled asphalt mixture is discarded, it will pollute the environment and waste resources, and mining new stone will damage the ecological environment. Cold recycling technology can not only save energy and resources, 100% use of old asphalt mixture, but also extend the construction season, improve the working conditions of construction personnel, and reduce environmental pollution. But at present, the quality of cold recycled mixture cannot meet the quality standard of asphalt as pavement surface layer, and can only be used in the base ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L63/00C08L75/06C08K3/34C08J3/24C08G18/66C08G18/42C08G18/10
Inventor 裴强杜素军庞瑾瑜畅润田薛君郭赢赢
Owner SHANXI PROVINCIAL RES INST OF COMM
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