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Preparation method of epoxy embedding modified asphalt emulsion

A technology of modified asphalt and emulsion, used in building components, building insulation materials, buildings, etc., can solve the problems of low curing efficiency, high performance, and large loss of curing agent, and achieve good drying film uniformity and stable storage. Good performance and uniform distribution

Active Publication Date: 2019-10-15
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The two-phase dispersion of the epoxy modified asphalt material after film formation and curing is uneven, and the performance is lower than expected
Thermally emulsified asphalt latex particles usually have a particle size of 2-10 microns, which is much larger than most latexes in emulsion polymerization; at room temperature, the blended epoxy resin (with strong polarity) cannot diffuse into the emulsion during the process of demulsification and film formation. Asphalt (weak polarity) has a tendency to agglomerate itself; the emulsifier system of epoxy resin and emulsified asphalt is different, and it is almost impossible to demulsify the two at the same time. In the asphalt film formed by the drying of the 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; the asphalt forms a single phase, 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
Both water-soluble epoxy and water-based curing agent are easy to diffuse with water loss and cause pollution; epoxy needs to be emulsified separately, and the amount of emulsifier will be increased, and water-soluble emulsifier will also bring certain environmental pollution
[0008] In addition, the hydrophilic modification of epoxy resin usually consumes a part of active groups, which deteriorates the cured performance of raw epoxy resin to a certain extent.
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

[0034] Epoxy resin E51 modified 200# emulsified asphalt

[0035] The ratio of raw materials is A emulsion——asphalt: E51:1631 (hexadecyltrimethylammonium chloride): OP-10 (alkylphenol polyoxyethylene ether) = 100:5:1.2:0.5; B emulsion— - Asphalt: T-31 (epoxy curing agent): 1631 (hexadecyltrimethylammonium chloride): OP-10 (alkylphenol polyoxyethylene ether) = 100:5:1.5:0.5; single group In (A+B) emulsion, emulsion A: emulsion B=100:25.

[0036] First heat the asphalt to a viscosity of ≤0.4Pa.s to make it flow, then put E51 and curing agent into the hot asphalt and stir evenly, and adjust the temperature to a viscosity of ≤0.3Pa.s according to the viscosity-reducing effect of epoxy resin and curing agent , carry out emulsification operation respectively according to the method of common asphalt, soap solution temperature is controlled in the scope of 60 ± 5 ℃, implement emulsification, respectively make emulsified asphalt (A) embedding with epoxy resin and emulsified asphalt (A...

Embodiment 2

[0039] Epoxy resin E44 modified 90# emulsified asphalt

[0040]The ratio of raw materials is A emulsion - asphalt: E44: sodium lauryl sulfate: OP-10 (alkylphenol polyoxyethylene ether) = 100:15:1.2:0.5; B emulsion - asphalt: 593# curing agent : Sodium lauryl sulfate: OP-10 (alkylphenol polyoxyethylene ether)=100:15:1.2:0.5; one-component (A+B) emulsion A:B=100:18.

[0041] 593# curing agent is the adduct of diethylene triamine and butyl glycidyl ether.

[0042] First, heat the asphalt until the viscosity is ≤0.4Pa.s to make it flow. Put E44 and curing agent into the hot asphalt and stir evenly. According to the viscosity-reducing effect of epoxy resin and curing agent, adjust the temperature until the viscosity is ≤0.3Pa.s . Carry out the emulsification operation according to the method of ordinary emulsified asphalt, the temperature of the soap liquid is controlled in the range of 60±5°C, emulsification is carried out, and the emulsified asphalt (A) embedded with epoxy resi...

Embodiment 3

[0045] Epoxy resin E51 modified 70# emulsified asphalt

[0046] The ratio of raw materials is A emulsion - asphalt: E51: Span 80: Tween 20 = 100:50:1:1; B emulsion - asphalt: 651# Curing agent: Span 80: Tween 20 = 100:50 :1:1; one-component (A+B) emulsion A:B=100:100.

[0047] First heat the asphalt to a viscosity of ≤0.4Pa.s to make it flow, then put E51 and curing agent into the hot asphalt and stir evenly, and adjust the temperature to a viscosity of ≤0.3Pa.s according to the viscosity-reducing effect of epoxy resin and curing agent . Carry out the emulsification operation according to the method of ordinary asphalt, control the temperature of the soap liquid in the range of 60±5°C, and carry out the emulsification to prepare emulsified asphalt embedded with epoxy resin (A) and emulsified asphalt embedded with curing agent (B) ). Mix the emulsified asphalt (A) and the emulsified asphalt (B) uniformly in proportion to obtain a one-component (A+B) epoxy-modified asphalt em...

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PUM

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Abstract

The invention discloses a preparation method of epoxy embedding modified asphalt emulsion. The method comprises the following steps: a, mixing and emulsifying epoxy resin and hot asphalt, so as to obtain emulsified asphalt A embedded with epoxy resin; b, mixing and emulsifying a curing agent and hot asphalt, so as to obtain emulsified asphalt B embedded with curing agent; c, mixing the emulsifiedasphalt A and the emulsified asphalt B, so as to obtain single-component epoxy-modified emulsified asphalt; further reducing the particle size of emulsion, so as to ensure that epoxy resin is uniformly distributed after emulsification and film formation. The method has the advantages that the performance of a film is improved after curing, loss of epoxy and the curing agent is reduced, the curingefficiency is improved, the proposes of energy conservation and consumption reduction, high stability in storage, high convenience in preparation and application, stable quality and no pollution are achieved, and the formed asphalt emulsion is applicable to structural materials and functional material for various civil and architectural engineering and protective engineering, such as various waterproof engineering and anti-corrosion engineering.

Description

technical field [0001] The invention relates to an emulsified asphalt, in particular to a preparation method of an epoxy-embedded modified asphalt emulsion. 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 add epoxy latex to emulsified aspha...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L63/00C08K5/19C08J3/00
CPCC08J3/005C08J2395/00C08J2463/00C08L95/00C08L63/00C08K5/19
Inventor 周超何丽红李力王念黄刚袁小亚张霞樊小义
Owner CHONGQING JIAOTONG UNIVERSITY