Polycarboxylate super plasticizer modified by utilizing straw and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of polycarboxylate water reducer and its preparation, can solve the problems that have not yet been seen in the test application effect, and achieve the goals of improving poor retarding effect, ensuring stability, and saving time Effect

Inactive Publication Date: 2017-01-04
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using crop stalks to directly prepare polycarboxylate superplasticizers has not yet seen good tests and reports with good application effects.

Method used

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  • Polycarboxylate super plasticizer modified by utilizing straw and preparation method thereof
  • Polycarboxylate super plasticizer modified by utilizing straw and preparation method thereof
  • Polycarboxylate super plasticizer modified by utilizing straw and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for preparing a polycarboxylate water reducer modified by straw, the specific steps are as follows:

[0042] (1) Straw pretreatment: After crushing the straw, add dilute acid, stir and mix evenly, soak for 18-36 hours, filter and rinse the straw with clean water until it is neutral, and then set aside;

[0043] In terms of mass concentration, the dilute acid is 1-3% sulfuric acid or 3-5% hydrochloric acid;

[0044] Straw: solid-liquid ratio of dilute acid=1g:(8-12mL);

[0045] (2) Preparation of polycarboxylate water reducer modified by straw, the specific process is:

[0046] First, add methallyl polyoxyethylene-1000, methallyl polyoxyethylene-2400, maleic anhydride, acrylamide, sodium methacrylate and straw into a four-necked flask;

[0047] Second, add distilled water to ensure that the system concentration is 35-45%, and heat up to 70-90°C;

[0048] Third, install the upper reflux device and the constant pressure dropping funnel, add ammonium persulfate ...

Embodiment 2

[0060] A method for preparing a polycarboxylate water reducer modified by straw, the specific steps are as follows:

[0061] (1) Straw pretreatment: after crushing the straw, add dilute acid, stir and mix evenly, soak for 18 hours, filter and rinse the straw with clean water until it is neutral, and then set aside;

[0062] In terms of mass concentration, the dilute acid is 1% sulfuric acid;

[0063] Straw: the solid-to-liquid ratio of dilute acid=1g:8mL;

[0064] (2) Preparation of polycarboxylate water reducer modified by straw, the specific process is:

[0065] First, add methallyl polyoxyethylene-1000, methallyl polyoxyethylene-2400, maleic anhydride, acrylamide, sodium methacrylate and straw into a four-necked flask;

[0066] Second, add distilled water to ensure that the system concentration is 35%, and heat up to 70°C;

[0067] Third, install the upper reflux device and the constant pressure dropping funnel, add ammonium persulfate in the constant pressure dropping f...

Embodiment 3

[0075] A method for preparing a polycarboxylate water reducer modified by straw, the specific steps are as follows:

[0076] (1) Straw pretreatment: After crushing the straw, add dilute acid, stir and mix evenly, soak for 21 hours, filter and rinse the straw with clean water until it is neutral, and then set aside;

[0077] In terms of mass concentration, the dilute acid is 2% sulfuric acid;

[0078] Straw: the solid-liquid ratio of dilute acid=1g:9mL;

[0079] (2) Preparation of polycarboxylate water reducer modified by straw, the specific process is:

[0080] First, add methallyl polyoxyethylene-1000, methallyl polyoxyethylene-2400, maleic anhydride, acrylamide, sodium methacrylate and straw into a four-necked flask;

[0081] Second, add distilled water to ensure that the system concentration is 36%, and raise the temperature to 74°C;

[0082] Third, install the upper reflux device and the constant pressure dropping funnel, add ammonium persulfate in the constant pressure...

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Abstract

A method for preparing a polycarboxylate super plasticizer modified by utilizing straw comprises a step (1) of pretreating straw; and a step (2) of preparing the polycarboxylate super plasticizer modified by utilizing the straw. The concrete process comprises a first step of adding raw materials in a four-neck flask; a second step of adding distilled water, and warning to 70-90 DEG C; a third step of installing an upper backflow device and a constant pressure dropping funnel, adding ammonium persulfate into the constant pressure dropping funnel, starting to add an initiator ammonium persulfate dropwise, and performing heat insulation for 4-5 h after the initiator is added dropwise; a fourth step of performing cooling to 35-45 DEG C, and adjusting the pH to 6.8-7.2, so that the polycarboxylate super plasticizer modified by utilizing the straw can be obtained. In sum, according to the polycarboxylate super plasticizer product modified by utilizing the straw, the wheat straw has a high influence on a polycarboxylate super plasticizer synthesis process, the ratio of other raw materials is affected, the cost is reduced, the reaction time is reduced by 1 hour, the time is saved, and the cost performance is higher compared with the original process.

Description

technical field [0001] The invention belongs to the technical field of water reducer preparation for construction engineering, and in particular relates to a polycarboxylate water reducer modified by straw and a preparation method thereof. Background technique [0002] Water reducing agent refers to the admixture that can reduce the mixing water consumption and improve the concrete strength under the condition of constant workability and cement dosage of concrete; or save the dosage of cement under the condition of constant workability and strength. [0003] Polycarboxylate superplasticizer is a kind of cement dispersant in the application of cement concrete. It can be divided into two types chemically. One is that the main chain is methacrylic acid, the side chain is carboxylic acid group and monomethyl polyethylene The polyester structure of the diol; the other is the polyether structure whose main chain is polyacrylic acid and the side chain is vinyl alcohol polyethylene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F291/06C08F222/06C08F220/56C08F228/02C04B24/16C04B103/30
CPCC08F289/00C04B24/165C04B40/0039C04B2103/302C08F283/065C08F222/06C04B18/24
Inventor 郭毅萍李国亭朱卫勇赵丽冰
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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