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Method for preparing single-component waterborne epoxy modified emulsified asphalt

A technology of emulsified asphalt and water-based epoxy, which is applied to building components, building insulation materials, buildings, etc., can solve the problems of low curing efficiency, increase the amount of epoxy resin added, and large loss of curing agent, so as to improve storage stability performance, improve quality stability, and improve curing efficiency

Pending Publication Date: 2019-10-22
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Asphalt, epoxy, and curing agent are mixed with three kinds of emulsions. Due to the difference in the properties of the emulsions, the two-phase dispersion of the epoxy-modified asphalt material after film formation and curing is uneven, and the performance is lower than expected.
The particle size of thermally emulsified asphalt emulsion is usually 2-10 microns, which is much larger than the particle size of water-based epoxy emulsion and water-based epoxy curing agent emulsion; It cannot diffuse into the asphalt (weak polarity) during the process, and has a tendency to agglomerate itself; the emulsifier system of epoxy resin and emulsified asphalt is different, and it is almost impossible for the two to demulsify at the same time. Phase segregation, so that in the asphalt film formed by drying the modified emulsion, the epoxy resin is independently distributed in the form of islands in larger agglomerates; only by increasing the amount of epoxy resin can the epoxy continuous phase be formed to achieve higher performance ; Asphalt is phased alone, its temperature sensitivity has not been effectively improved, high temperature softening, low temperature embrittlement
[0006] 2. The loss of curing agent is large, and the curing efficiency is not high
No matter how the water-based curing agent is mixed into the system, it will diffuse and lose with water, and be consumed by the adsorption of aggregates or fillers; only the part that enters the epoxy resin will participate in the curing reaction, and the epoxy resin will not be completely cured, so it is difficult to Give full play to its modifying effect
Therefore, due to these deficiencies, the effect of epoxy modification cannot meet expectations, or in order to achieve higher performance, the amount of epoxy resin must be added, and the cost has risen.
[0007] 3. There are still some emission pollution problems
Water-soluble epoxy and water-based curing agents are easy to spread with water loss and cause pollution; the curing agent needs to be emulsified separately, and the amount of emulsifier will be increased, and water-soluble emulsifiers will also bring certain environmental pollution
[0008] In addition, the two components need to be stored separately, and the blending needs to be stirred and mixed, and the process is more complicated
It can be seen that the existing technology is still not perfect, and there is a large room for improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A emulsion——emulsified asphalt, cationic emulsified asphalt, with a solid content of 50%; water-based epoxy resin emulsion, with a solid content of 50%, and an epoxy value of 0.25; emulsified asphalt: water-based epoxy = 100:10; Emulsified asphalt is mixed with water-based epoxy resin to prepare emulsified asphalt A;

[0036] B emulsion——asphalt: T-31 (epoxy curing agent): 1631 (hexadecyltrimethylammonium chloride): OP-10 (alkylphenol polyoxyethylene ether): water = 100:10:2 :1:86; first heat the asphalt to a fluid state, put the T-31 curing agent into the hot asphalt and stir evenly, adjust the temperature to a viscosity ≤0.3Pa. Add the above-mentioned additives in the emulsification operation, control the temperature of the soap solution in the range of 60±5°C, and perform emulsification to obtain emulsified asphalt B containing a curing agent;

[0037] Emulsion A in the single-component (A+B) emulsion: emulsion B=100:20; mix emulsified asphalt A and emulsified aspha...

Embodiment 2

[0040] A emulsion——emulsified asphalt, anionic emulsified asphalt, solid content is 60%; Water-based epoxy resin, non-ionic water-based epoxy resin, solid content is 50%, epoxy value is 0.27; Emulsified asphalt: water-based epoxy = 100:25; Mix anionic emulsified asphalt and nonionic water-based epoxy resin evenly to prepare emulsified asphalt A;

[0041] B emulsion——asphalt: 593# curing agent (epoxy curing agent): SDS (sodium dodecyl sulfate): OP-10 (alkylphenol polyoxyethylene ether): water = 100:15:2:2: 81; first heat the asphalt to a flow state, put 593# curing agent into the hot asphalt and stir evenly, adjust the temperature to a viscosity ≤0.3Pa. Auxiliary, the temperature of the soap solution is controlled within the range of 60±5°C, and emulsification is carried out to obtain emulsified asphalt B containing a curing agent;

[0042] Emulsion A in the single-component (A+B) emulsion: emulsion B=100:25; mix emulsified asphalt A and emulsified asphalt B in proportion to o...

Embodiment 3

[0046] A emulsion——emulsified asphalt, non-ionic emulsified asphalt, with a solid content of 55%; water-based epoxy resin, non-ionic water-based epoxy resin, with a solid content of 50%, and an epoxy value of 0.23; emulsified asphalt: water-based epoxy =100:30; mix nonionic emulsified asphalt and nonionic water-based epoxy resin evenly to prepare emulsified asphalt A;

[0047] B emulsion——asphalt: 651# curing agent (epoxy curing agent): Span 80: Tween 20: water=100:30:2:2:66; the asphalt is first heated to flow state, and 651# curing agent Put in hot asphalt and stir evenly. According to the viscosity-reducing effect of the curing agent, adjust the temperature to a viscosity of ≤0.3Pa.s. Perform emulsification operations according to the method of ordinary asphalt and add the above-mentioned additives. The temperature of the soap liquid is controlled within the range of 60±5°C. Implement emulsification to obtain emulsified asphalt B containing curing agent;

[0048] Emulsion ...

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Abstract

The invention discloses a method for preparing a single-component waterborne epoxy modified emulsified asphalt. The method comprises the following steps: a, mixing a waterborne epoxy resin with an emulsified asphalt to prepare an emulsified asphalt A; b, uniformly mixing a curing agent with hot asphalt, performing emulsification to obtain an emulsified asphalt B containing the curing agent in asphalt particles; and c, uniformly mixing the emulsified asphalt A with the emulsified asphalt B to obtain the single-component waterborne epoxy modified emulsified asphalt. The curing agent hides in theasphalt latex particles, so the curing reaction of the epoxy resin in an emission during the storage period is avoided, and the storage stability is improved; the application convenience is benefited, the construction process can be easily monitored, and the quality stability is improved; and the oil-based curing agent has no diffusion loss in water, so the epoxy resin is cured completely after the film formation of the emulsion, the performances after the formed film is cured are improved, the loss of the curing agent is reduced, and the curing efficiency is improved. The prepared asphalt emulsion is suitable for various civil engineering construction and waterproof and anticorrosive protection projects as a structural material and a functional material.

Description

technical field [0001] The invention relates to a modified emulsified asphalt, in particular to a preparation and application method of a single-component water-based epoxy modified asphalt. Background technique [0002] Asphalt is an oily substance, which is widely used in civil engineering, waterproofing, anticorrosion, etc., in various ways. With the improvement of environmental protection requirements, the application of asphalt materials is gradually developing in the direction of water-based, and it is applied in the form of emulsified asphalt. In various application scenarios, due to the presence of water in the emulsion, the performance of emulsified asphalt is lower than that of hot melt or hot mix asphalt. Modification with epoxy resin is an effective means to improve its performance. [0003] There are various modification methods of epoxy modified emulsified asphalt, for example: patents CN1441032, CN102010607, CN1903941 first prepare emulsified asphalt, then a...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L63/00C08J3/03
CPCC08J3/03C08J2395/00C08J2463/00C08J2495/00
Inventor 何丽红王念李力周超侯艺桐马悦帆
Owner CHONGQING JIAOTONG UNIVERSITY
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