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A kind of cement mortar starch-based water-retaining agent and preparation method thereof

A technology for cement mortar and its production method, which is applied in the field of cement mortar starch-based water-retaining agent and its production, which can solve the problems of high cost, large-scale application, complex production process, etc., and achieve the effect of prolonging the setting time

Active Publication Date: 2021-07-06
诸城兴贸玉米开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] A Chinese patent of cross-linked carboxymethyl starch for cement water-retaining agent and its preparation method-CN201611112976.3, the cross-linked carboxymethyl starch used, but its production process is complicated, the use cost is high and the large-scale application is limited, and it must be used specific starch

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A starch-based water-retaining agent for cement mortar, which is made of the following raw materials in parts by weight: sodium chloroacetate: 5 parts; starch: 100 parts; alkaline catalyst: 110 parts, and crosslinking agent: 100.4 parts.

[0022] The above-mentioned production method comprises the following steps:

[0023] 1) Mix sodium chloroacetate dry powder evenly into starch, sodium chloroacetate:starch=5:100, obtain mixture 1;

[0024] 2) Add a basic catalyst to the mixture 1, the basic catalyst is sodium hydroxide, potassium hydroxide, sodium carbonate:starch=10:100, leave it for 24 hours, fully activate the starch and sodium chloroacetate, and obtain the mixture 2;

[0025] 3) Put the mixture 2 in the modified starch dry reactor, keep the temperature at 45°C, stir and react for 5 hours to obtain the mixture 3;

[0026] 4) Add a cross-linking agent to the mixture three, the cross-linking agent is epichlorohydrin:starch=0.4:100, heat up to 60°C, react for 6 hours...

Embodiment 2

[0028] A starch-based water-retaining agent for cement mortar, which is made of the following raw materials in parts by weight: sodium chloroacetate: 15 parts; starch: 120 parts; alkaline catalyst: 120 parts, and crosslinking agent: 101 parts.

[0029] The above-mentioned production method comprises the following steps:

[0030] 1) Mix sodium chloroacetate dry powder evenly into starch, sodium chloroacetate:starch=15:100, obtain mixture 1;

[0031] 2) Add a basic catalyst to the mixture 1, the basic catalyst is sodium hydroxide, potassium hydroxide, sodium carbonate:starch=20:100, leave it for 24 hours, fully activate the starch and sodium chloroacetate, and obtain the mixture 2;

[0032] 3) Put the mixture 2 in the modified starch dry reactor, keep the temperature at 50°C, stir and react for 6 hours to obtain the mixture 3;

[0033] 4) Add a cross-linking agent to the mixture three, the cross-linking agent is epichlorohydrin:starch=1:100, heat up to 70°C, react for 10 hours,...

Embodiment 3

[0035] A starch-based water-retaining agent for cement mortar, which is made of the following raw materials in parts by weight: sodium chloroacetate: 10 parts; starch: 110 parts; alkaline catalyst: 115 parts, and crosslinking agent: 100.5 parts.

[0036] The above-mentioned production method comprises the following steps:

[0037] 1) Mix sodium chloroacetate dry powder evenly into starch, sodium chloroacetate:starch=10:100, obtain mixture 1;

[0038] 2) Add a basic catalyst to the mixture 1, the basic catalyst is sodium hydroxide, potassium hydroxide, sodium carbonate:starch=15:100, leave it for 24 hours, fully activate the starch and sodium chloroacetate, and obtain the mixture 2;

[0039] 3) Put the mixture 2 in a modified starch dry reactor, keep the temperature at 45°C, stir and react for 5 hours to obtain the mixture 3;

[0040] 4) Add a cross-linking agent to mixture three, the cross-linking agent is epichlorohydrin:starch=0.5:100, heat up to 65°C, react for 7 hours, pu...

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Abstract

The invention discloses a starch-based water-retaining agent for cement mortar, which is made of the following raw materials in parts by weight: sodium chloroacetate: 5-15 parts; starch: 100-120 parts; alkaline catalyst: 110-120 parts; crosslinking agent: 100.4‑101 parts. The invention also discloses a preparation method of the starch-based water-retaining agent for cement mortar. The invention has the following beneficial effects: the viscosity reaches 2800-3300mPa.s at a concentration of 2%, the water retention rate reaches 89%-97%, and the solidification time is prolonged by 6-8 hours.

Description

technical field [0001] The invention relates to a cement water-retaining agent and a preparation method thereof, in particular to a cement mortar starch-based water-retention agent and a preparation method thereof. Background technique [0002] The traditional mortar is made by mixing cement, lime paste and sand with water at the construction site. Its disadvantages are that it requires a large area of ​​raw material stockpile, the mixing ratio is not accurately controlled, the quality of the mortar cannot be effectively guaranteed, the waste of materials is serious, and it is not environmentally friendly, which seriously affects the quality of construction projects and building functions. [0003] Adding polymer admixtures to the mortar can improve the performance of the mortar and fully meet the various functional requirements of construction projects. Water retaining agent is an admixture to change the special properties of the mortar, also known as a thickener, which ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C08B31/00C08B31/12C04B103/46
CPCC04B24/38C04B2103/465C08B31/006C08B31/12
Inventor 夏凤清孙纯锐邱洪伟干福良
Owner 诸城兴贸玉米开发有限公司
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