Foaming agent capable of reducing water absorption rate of foamed mixed light soil

A technology of foaming agent and light soil, which is applied in the field of foaming agent that can reduce the water absorption of air bubbles mixed with light soil, and can solve the problems that light soil is difficult to achieve the coordination of water absorption and use performance, and achieve good foaming , mild reaction conditions and low price

Active Publication Date: 2020-10-13
THE FIRST SINCERITY CONSTR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used waterproofing method is to add hydrophobic agent in the preparation process of air-bubble mixed light soil, but most of the hydrophobic agent has obvious defoaming effect, which makes it difficult to coordinate with the existing foaming agent system. It is difficult to achieve the coordination of water absorption and other performance of light soil

Method used

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  • Foaming agent capable of reducing water absorption rate of foamed mixed light soil

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Effect test

Embodiment 1

[0030] A kind of foaming agent that can reduce the water absorption rate of bubble-mixed light soil, its preparation method comprises the steps:

[0031] 1) Preparation of modified cardanol-based surfactant: cardanol and concentrated sulfuric acid (with introduced H 2 SO 4 Measure) according to the molar ratio of 1:0.2, weigh, put the cardanol that weighs into reaction kettle, add concentrated sulfuric acid (stirring speed 650r / min) while stirring, react 150min at 45 ℃, get intermediate product ( Sulfonated cardanol); Then under stirring (stirring speed 400r / min, temperature is 35 ℃) add N-methyldiethanolamine and sodium ethylate (the mol ratio of N-methyldiethanolamine and sodium ethylate is 1:1 ), reacted to the pH of the resulting solution system = 9; finally, under the conditions of nitrogen protection atmosphere and 0.3MPa, the temperature was raised to 130°C, and ethylene oxide (the molar ratio to cardanol was 20:1) was passed through to carry out polyether Chemical re...

Embodiment 2

[0035] A kind of foaming agent that can reduce the water absorption rate of bubble-mixed light soil, its preparation method comprises the steps:

[0036] 1) Preparation of modified cardanol-based surfactant: weigh cardanol and concentrated sulfuric acid at a molar ratio of 1:0.25, put the weighed cardanol into a reaction kettle, add concentrated sulfuric acid while stirring (stirring speed 650r / min), and reacted at 40°C for 160min to obtain an intermediate product (sulfonated cardanol); then add N-methyldiethanolamine and sodium ethylate under stirring conditions (stirring speed 450r / min, temperature 35°C) (The molar ratio of N-methyldiethanolamine and sodium ethoxide is 1:1), react until the pH of the obtained solution system=9.5; finally, under the condition of nitrogen protection atmosphere and 0.3MPa, heat up to 130°C, and pass into the ring Oxyethane (the molar ratio with cardanol is 10:1) carries out polyetherification reaction 4h, obtains modified cardanol-based surfact...

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Abstract

The invention discloses a foaming agent capable of reducing the water absorption rate of bubble mixed light soil. The foaming agent is prepared by compounding a modified cardanol-based surfactant anda modified ammonium stearate emulsion. The preparation method comprises the following steps of: performing sulfonation reaction on cardanol; carrying out neutralization reaction by utilizing N-methyldiethanolamine and sodium ethoxide until an alkaline condition is reached; and introducing oxa naphtheneto carry out a polyetherification reaction. The obtained modified cardanol-based surfactant hasgood foaming performance and foam stabilizing performance, has good compatibility with the modified ammonium stearate, and can play a role in a superimposed mode, so that the obtained foaming agent has good foaming performance, foam stabilizing performance and waterproof performance at the same time, and the waterproof performance and using performance of obtained foamed light soil are effectivelyconsidered. The preparation method of the foaming agent is simple, low in cost and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a foaming agent capable of reducing the water absorption rate of light soil mixed with air bubbles. Background technique [0002] In recent years, air-foam mixed lightweight soil has been widely used in the field of road and building filling, especially in soft foundation treatment, abutment backfill, roadbed widening and other working conditions. Because the wet bulk density of air-bubble mixed light soil is generally only 400-600kg / m 3 , dry bulk density 300-500kg / m 3 , there are a large number of connected pores inside, resulting in extremely high water absorption of light soil, generally reaching more than 20% of its mass, and even reaching more than 30% when the bulk density is low. [0003] However, light soils are often used in conditions with abundant groundwater. In this case, light soils will absorb a large amount of water, so that the bulk dens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/22C04B22/12C04B24/08C04B24/12C04B103/42
CPCC04B40/0046C04B24/22C04B24/085C04B22/124C04B24/122C04B2103/42C04B22/002
Inventor 罗枫阳晏刘小清黄绍龙姜峰林
Owner THE FIRST SINCERITY CONSTR TECH CO LTD
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