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A cationic slow-cracking and fast-setting asphalt emulsifier with steric hindrance

A technology of asphalt emulsifier and steric hindrance, which is applied in organic chemistry, building components, building insulation materials, etc., can solve problems such as difficult control, complex process, and insufficient mild conditions, and achieve cheap raw materials, simple process routes, and high quality raw materials. Effects at an affordable price

Inactive Publication Date: 2018-05-11
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used cationic asphalt emulsifiers are more fast-cracking and medium-cracking, and it is difficult to meet the requirements of slow-cracking and fast-setting slurry seals. Therefore, slow-cracking and fast-setting asphalt emulsifiers have always been a hot spot in the research of asphalt emulsifiers.
[0003] At present, the reports about slow-cracking and fast-setting cationic asphalt emulsifiers mainly include: Chinese patent CN104693450A invented a slow-cracking asphalt emulsifier, and synthesized a new type of Asphalt emulsifier tetraethylenepentamine / formaldehyde modified lignin amine is a slow-cracking asphalt emulsifier, but due to the introduction of lignin, there are many by-products, and the structure and content of by-products have a certain impact on the emulsification effect , not easy to control
Chinese patent CN104941509A invented a slow-cracking and fast-setting asphalt emulsifier for micro-surfacing. The asphalt emulsifier was obtained through amidation, cyclization reaction and addition reaction, but the conditions were not mild enough and high temperature and vacuum conditions were required
Chinese patent CN102492136A invented a series of slow-cracking and fast-setting cationic asphalt emulsifiers. The basic raw materials are cheap and easy to obtain, but they need to be compatible with auxiliary raw materials in different components and fed in time according to the mass ratio. The process is more complicated.

Method used

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  • A cationic slow-cracking and fast-setting asphalt emulsifier with steric hindrance
  • A cationic slow-cracking and fast-setting asphalt emulsifier with steric hindrance
  • A cationic slow-cracking and fast-setting asphalt emulsifier with steric hindrance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] One, the preparation of intermediate B

[0030] Dissolve 4.66g (0.014mol) bromooctadecane in 15ml of ethyl acetate (the amount of ethyl acetate can dissolve bromooctadecane), and dissolve 0.40g (0.01mol) NaOH in 10ml of ethanol In aqueous solution (ethanol: distilled water = 4:1 volume ratio), the two parts of the solution were placed in a 100ml three-necked flask, and reacted at 30°C for 20min under magnetic stirring. Under nitrogen protection, 1.5ml (0.015mol) tetrahydropyrrole was dissolved In 5ml of ethyl acetate (the amount of ethyl acetate can dissolve tetrahydropyrrole), put it in a constant pressure dropping funnel and slowly drop it into a three-necked flask. After 15 minutes, the dropwise addition is completed, and then the reaction is carried out under magnetic stirring at 55°C for 6 hours. Rotary evaporation at 50°C, the solvent was evaporated, the product was washed with distilled water at 40°C, filtered with suction, and dried in vacuum at 40°C to obtain I...

Embodiment 2

[0048] One, the preparation of intermediate B

[0049] Dissolve 8.33g (0.025mol) bromooctadecane in 25ml ethyl acetate, dissolve 0.60g (0.015mol) NaOH in 15ml aqueous alcohol solution (absolute ethanol: distilled water = 4:1), the two parts The solution was placed in a 100ml three-neck flask, and reacted at 30°C for 20min under magnetic stirring. Under nitrogen protection, 3ml (0.03mol) of tetrahydropyrrole was dissolved in 10ml of ethyl acetate, and slowly dropped into the constant pressure dropping funnel. In the there-necked flask, the dropwise addition was completed in 20 minutes, the reaction was carried out under magnetic stirring at 55°C for 6 hours, the solvent was evaporated by rotary evaporation at 50°C, the product was washed with distilled water at 40°C, suction filtered, and vacuum-dried at 40°C to obtain Intermediate B.

[0050] Two, the preparation of product A

[0051] Dissolve 6.46g (0.02mol) of intermediate B in 30ml of absolute ethanol, add it to a 100ml th...

Embodiment 3

[0056] 1. Preparation of cationic asphalt emulsifier with steric hindrance

[0057] Except that the time in the preparation of intermediate B was changed to 8h, others were the same as in Example 2 to obtain an asphalt emulsifier for future use.

[0058] 2. Preparation of emulsified asphalt:

[0059] According to the method of Example 1, the emulsifier obtained above was used to emulsify asphalt.

[0060] The properties of emulsified asphalt are shown in Table 1.

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PUM

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Abstract

The invention provides positive ion slow-breaking quick-setting type asphalt emulsifier containing steric hindrance. The structure of the emulsifier is shown as follows. According to the emulsifier, a tetrahydropyrrole ring is introduced, a quaternization reaction is conducted, positive ions are obtained, and steric hindrance is added to hydrophilic nitrogen atoms of asphalt emulsifier, that is, a ring is added around the N atoms, so that a blocking function is achieved when the ring makes contact with the surface of stone. The obtained asphalt emulsifier is good in emulsification effect, prepared emulsified asphalt is uniform and stable, synthesis conditions are mild, and the process is simple. Please see the structure in the description, wherein n is equal to 12 or 14 or 16 or 18.

Description

technical field [0001] The invention relates to an asphalt emulsifier and its synthesis method and application, in particular to a cationic slow-cracking and fast-setting type asphalt emulsifier containing steric hindrance, its synthesis method and application. technical background [0002] In recent years, with the rapid development of the economy, the requirements for transportation have also increased, especially for the repair and maintenance of the road surface in use. In order to repair the damage of the pavement and make the road open to traffic as soon as possible, it is necessary to study slow-cracking and fast-setting asphalt emulsifiers for slurry seals. Among the many emulsifiers, the application of quaternary ammonium salt emulsifiers is particularly prominent, because the nitrogen atom has a strong adsorption capacity for both acidic and alkaline stones, which makes asphalt and stones have strong adhesion. The currently used cationic asphalt emulsifiers are mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/03C07D303/36C07D301/27C08L95/00
CPCC07D301/27C07D303/36C08J3/03C08J2395/00
Inventor 王月欣刘媛媛张倩孟清
Owner HEBEI UNIV OF TECH
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