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Polyacrylamide modified bentonite for mortar and preparation method thereof

A technology of polyacrylamide and polyacryloyl glue, which is applied in the field of modified bentonite and its preparation, can solve the problems of affecting the mechanical properties of mortar and hindering the hydration of cement, so as to improve the construction performance, reduce the cost of raw materials, and improve the compression resistance intensity effect

Active Publication Date: 2012-09-12
北京振利节能环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a polyacrylamide-modified bentonite for mortar and a preparation method thereof, to solve the technical problem that when the bentonite is directly added to the mortar, the mechanical properties of the mortar are affected and the hydration of cement is hindered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, the preparation method of this polyacrylamide modified bentonite for mortar has the following steps:

[0029] Step 1. Based on bentonite, calculate the content of each raw material of polyacryl glue, bentonite: polyacrylamide: water reducer: ethylene glycol: water = 100: 1: 4: 6: 30;

[0030] Step 2, prepare polyacrylamide glue: dissolve the water reducer in water, stir to dissolve until uniform, then add ethylene glycol and continue stirring, finally slowly add polyacrylamide and stir evenly, the rotation speed of the mixer is controlled at 300 rpm , to obtain polyacrylamide glue;

[0031] Step 3, place the prepared polyacrylamide glue for 24 hours;

[0032] Step 4: After the polyacrylamide glue is completely uniform, mix the polyacrylamide glue with bentonite and stir evenly, after drying and grinding, pass through an 80-mesh sieve to obtain polyacrylamide modified bentonite.

[0033] Compared with the mortar prepared by the modified bentonite prepared...

Embodiment 2

[0034] Embodiment 2, the preparation method of this polyacrylamide modified bentonite for mortar has the following steps:

[0035] Step 1, using bentonite as the base, calculate the content of each raw material of polyacryl glue, bentonite: polyacrylamide: water reducer: ethylene glycol: water = 100: 2: 6: 3: 20;

[0036] Step 2, prepare polyacrylamide glue: dissolve the water reducer in water, stir to dissolve until uniform, then add ethylene glycol and continue stirring, finally slowly add polyacrylamide and stir evenly, the rotation speed of the mixer is controlled at 300 rpm , to obtain polyacrylamide glue;

[0037] Step 3, place the prepared polyacrylamide glue for 24 hours;

[0038] Step 4: After the polyacrylamide glue is completely uniform, mix the polyacrylamide glue with bentonite and stir evenly, after drying and grinding, pass through an 80-mesh sieve to obtain polyacrylamide modified bentonite.

[0039] Compared with the mortar prepared by the modified bentonite...

Embodiment 3

[0040] Embodiment 3, the preparation method of this polyacrylamide modified bentonite for mortar has the following steps:

[0041] Step 1, using bentonite as the base, calculate the content of each raw material of polyacryl glue, bentonite: polyacrylamide: water reducing agent: ethylene glycol: water = 100: 4: 10: 1: 40;

[0042] Step 2, prepare polyacrylamide glue: dissolve the water reducer in water, stir to dissolve until uniform, then add ethylene glycol and continue stirring, finally slowly add polyacrylamide and stir evenly, the rotation speed of the mixer is controlled at 300 rpm , to obtain polyacrylamide glue;

[0043] Step 3, place the prepared polyacrylamide glue for 24 hours;

[0044] Step 4: After the polyacrylamide glue is completely uniform, mix the polyacrylamide glue with bentonite and stir evenly, after drying and grinding, pass through an 80-mesh sieve to obtain polyacrylamide modified bentonite.

[0045] Compared with the mortar prepared by the modified b...

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Abstract

Disclosed are polyacrylamide modified bentonite for mortar and a preparation method thereof. The polyacrylamide modified bentonite for mortar is formed by bentonite and polyacrylamide glue wrapping the surface of the bentonite. The polyacrylamide glue comprises, by weight percent based on the bentonite, 1%-4% of polyacrylamide, 1%-6% of ethylene glycol, 4%-10% of water reducer, and 20%-40% of water. By the aid of the polyacrylamide modified bentonite, molecular chain frames of the bentonite and the polyacrylamide are changed. By modification, negative effects of the bentonite and the polyacrylamide on mortar are avoided, compressive strength, bending strength and bonding strength of the mortar can be improved evidently, and application property, water retention and opening time of the mortar are improved. On the condition that the strength of the mortar is unchanged, consumption of cement in the mortar is reduced, consumption of expensive redispersible latex powder is reduced, and material cost of the mortar is reduced.

Description

technical field [0001] The invention relates to a modified bentonite added to building mortar and a preparation method thereof. Background technique [0002] Bentonite is a kind of clay rock, also known as montmorillonite clay rock, the main chemical components are silicon dioxide, aluminum oxide and water. Bentonite has strong hygroscopicity and expansibility, and has certain viscosity, thixotropy and lubricity, and its admixture with cement or fine sand has plasticity and cohesiveness. However, due to the fact that bentonite absorbs a large amount of water during the swelling process, the free water in the mortar will decrease, the fluidity will decrease, and it will also hinder the hydration of cement, manifested as decreased strength and increased shrinkage. At present, adding a small amount of bentonite to mortar is mainly used as a water-retaining agent. If its excellent performance is to be exerted, the bentonite must be modified so that it can still maintain expansi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B24/12C04B22/08
Inventor 李喜超
Owner 北京振利节能环保科技股份有限公司
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