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Lignin-based foam concrete foaming agent, and preparation method and application thereof

A foamed concrete and lignin-based technology, applied in the field of concrete foaming agent, can solve the problems of incomplete foaming agent performance, poor foaming ability, poor stability, etc. High stability effect

Active Publication Date: 2014-02-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the shortcomings of the existing foaming agent, such as incomplete performance (poor foaming ability or poor stability) and high cost, and for the first time use alkali lignin which is cheap and has a wide range of sources as the main raw material to develop a comprehensive foaming agent. Excellent lignin-based foam concrete foaming agent

Method used

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  • Lignin-based foam concrete foaming agent, and preparation method and application thereof
  • Lignin-based foam concrete foaming agent, and preparation method and application thereof
  • Lignin-based foam concrete foaming agent, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0040] Add 100g of wood pulp alkali lignin solid powder into water, adjust the pH value to 9 with NaOH aqueous solution with a mass fraction of 30% under stirring, and dissolve it into a solution with a mass concentration of 30%; add 20g of sodium glutamate at 60°C , and drop 25g of glyoxal, and react for 3 hours to obtain aminated carboxylated alkali lignin; add 25g sodium styrene sulfonate to the solution of aminated carboxylated alkali lignin, heat up to 70°C, and drop 5g of peroxide Dibenzoyl initiator, react for 3 hours; then add 10g sodium lauryl sulfate and 5g carboxymethyl cellulose to the product, stir evenly, and obtain a liquid lignin-based concrete foaming agent after cooling.

Embodiment 2

[0042] Add 100g of bamboo alkali lignin solid powder into water, adjust the pH value to 11 with KOH aqueous solution with a mass fraction of 30% under stirring, and dissolve it into a solution with a mass concentration of 50%; add 5g of sodium glycinate at a temperature of 70°C, and drop Add 10g of formaldehyde and react for 1h to obtain aminated carboxylated alkali lignin; add 10g of sodium vinyl sulfonate to the solution of aminated carboxylated alkali lignin, raise the temperature to 90°C, and drop 1g of azobisisobutyronitrile to initiate agent, reacted for 4 hours; then added 15g of fatty alcohol sodium sulfate and 2g of polyvinyl alcohol to the product, stirred evenly, and obtained a liquid lignin-based concrete foaming agent after cooling.

Embodiment 3

[0044] Add 100g of wheatgrass lignin solid powder into water, adjust the pH value to 10 with NaOH / KOH mixed aqueous solution with a mass fraction of 30% under stirring, and dissolve it into a solution with a mass concentration of 40%; add 10g of alanine at a temperature of 65°C Sodium acid, and drop 20g of acetaldehyde, react for 2h, to obtain aminated carboxylated alkali lignin; Add 20g of sodium methacryl sulfonate to the solution of aminated carboxylated alkali lignin, heat up to 80 ° C, and drop 3g dibenzoyl peroxide initiator, react for 3h; then add 12g sodium lauryl polyoxyethylene ether sulfate and 4g hydroxyethyl methylcellulose to the product, stir evenly, and obtain liquid lignin-based concrete foam after cooling foaming agent.

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Abstract

The invention discloses a lignin-based foam concrete foaming agent, and a preparation method and application thereof. The preparation method comprises the following steps: adding lignin solid powder to water, preparing into a water solution of which the mass fraction is 30-50%; adjusting the pH value to 9-11 by using an alkaline regulator; heating to 60-70 DEG C; adding an alpha-amino acids compound and aldehyde substances and reacting for 1-3 hours, so as to obtain amination carboxyl alkali lignin; heating to 70-90 DEG C, adding a sulfonic acid monomer and an initiator and reacting for 3-4 hours; then adding a surfactant and a foam stabilizer to the product, evenly stirring and cooling, so as to obtain a liquid product. The foaming agent prepared by the method has strong foaming capability and high stability, generates fine and uniform foams, and is low in price. Furthermore, the path of resource utilization of papermaking black liquor is also expanded by the foaming agent; the pollution of the black liquor to the environment is reduced; and therefore the lignin-based foam concrete foaming agent has significant economic and social value.

Description

technical field [0001] The invention relates to a concrete foaming agent, in particular to a preparation method and application of a lignin-based foam concrete foaming agent. Background technique [0002] Foam concrete refers to the preparation of a foaming agent aqueous solution into a foam by mechanical means, and then adding the foam to a slurry composed of siliceous materials, calcium materials, water and various admixtures, etc., after mixing and stirring, casting, It is a kind of light porous material formed by curing, which can be poured on site (such as cast-in-place floor heating, roof, self-insulation of walls, compensation foundation, backfilling of tunnel foundation pit, etc.), and can also be prefabricated into insulation bricks and blocks , wall panels, sandwich components, fabricated components, etc. In recent years, with the implementation of my country's energy-saving and emission-reduction strategy, foam concrete has received more and more attention, and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B24/26C04B24/18
Inventor 邱学青郑大锋杨东杰孙晓红楼宏铭庞煜霞
Owner SOUTH CHINA UNIV OF TECH
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