Block polyether for early-strength shrinkage-resistant polycarboxylate water reducing agent and preparation method of block polyether

A technology of block polyether and polycarboxylic acid, which is applied in the field of block polyether and its preparation, can solve the problems of low concrete slump and fluidity, concrete bleeding, poor adaptability, etc., and achieve improved affinity Water-lipophilicity, promotion of cement hydration, and the effect of reducing the sensitivity of dosage

Inactive Publication Date: 2021-08-27
广东奥克化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In related technologies, polycarboxylate superplasticizers have a problem of sensitivity, poor workability, and poor adaptability. If more concrete is added, bleeding will occur, and if less concrete is added, the slump and fluidity will be small.

Method used

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  • Block polyether for early-strength shrinkage-resistant polycarboxylate water reducing agent and preparation method of block polyether
  • Block polyether for early-strength shrinkage-resistant polycarboxylate water reducing agent and preparation method of block polyether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: A block polyether for early-strength polycarboxylate water reducer, obtained by reacting the following components in terms of weight percentage: prenol polyoxyethylene ether with a molecular weight of 700 is 346g , the basic catalyst is 0.3g, the basic catalyst is selected powdery sodium methylate, the ethylene oxide is 948.3g, the propylene oxide is 286.7g, the weak acid neutralizer is 0.9g, and the weak acid is selected acetic acid.

[0037] The molecular weight is 350g of isopentenol polyoxyethylene ether of 700,

[0038] raw material:

[0039] a. Isopentenol polyoxyethylene ether-2400 (the number indicates the weight average molecular weight, the same below);

[0040] B, phosphorus pentoxide (analytical pure);

[0041] c, sulfamic acid;

[0042] d, sodium hydroxide (using mass fraction is 40% sodium hydroxide aqueous solution).

[0043] Wherein the molar ratio of raw materials a and b is 2:1;

[0044] Raw material c is 1.0% of the total mass of a and...

Embodiment 2

[0049] Example 2: A block polyether for early-strength polycarboxylate water reducer, obtained by reacting the following components in terms of weight percentage: 350 g of isopentenol polyoxyethylene ether with a molecular weight of 1800 , the basic catalyst is 0.3g, the basic catalyst is selected powdery sodium methylate, ethylene oxide is 503.6g, propylene oxide is 111.5g, the weak acid neutralizer is 0.9g, and the weak acid is selected acetic acid for use.

[0050] Example 2, the molecular weight is 350g of isopentenol polyoxyethylene ether of 1800

[0051] raw material:

[0052] a. Isopentenol polyoxyethylene ether-2000;

[0053] B, phosphorus pentoxide (analytical pure);

[0054] c. 98% concentrated sulfuric acid;

[0055] d, sodium hydroxide (using mass fraction is 40% sodium hydroxide aqueous solution).

[0056] Wherein the molar ratio of raw materials a and b is 2:1;

[0057] Raw material c is 0.5% of the total mass of a and b;

[0058] Raw material d is 1.0% of ...

Embodiment 3

[0060] Embodiment 3, raw material:

[0061] a. Isopentenol polyoxyethylene ether-1800;

[0062] B, phosphorus pentoxide (analytical pure);

[0063] d, sodium hydroxide (using mass fraction is 40% sodium hydroxide aqueous solution).

[0064] Wherein the molar ratio of raw materials a and b is 1.9:1;

[0065] Raw material d is 0.125% of the total mass of a and b.

[0066] The four-neck flask is equipped with a thermometer, a stirring and reflux device, and is protected by nitrogen. Put the TPEG-1800 monomer into a four-necked bottle, heat it to 50°C in a water bath to melt, and stir for 5 minutes. Add phosphorus pentoxide in batches at 50°C, each time not exceeding 10% of the total amount of phosphorus pentoxide, with an interval of 10 minutes each time. Control the temperature not to exceed 50°C. After adding phosphorus pentoxide, the temperature was raised to 70°C for 4 hours. Lower the temperature to 50°C for neutralization to obtain the phosphorylated monomer of the p...

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Abstract

The invention relates to a block polyether for an early-strength shrinkage-resistant polycarboxylate water reducing agent and a preparation method thereof. According to the block polyether, a polycarboxylate water reducing agent phosphorylated monomer is taken as a raw material to partially replace a polyoxyethylene ether monomer, and the block polyether comprises 1-20% of the polycarboxylate water reducing agent phosphorylated monomer, 1-10% of isopentenol polyoxyethylene ether, 1-10% of methylallyl alcohol polyoxyethylene ether, 0.2-0.6% of an alkaline catalyst, 60-90% of ethylene oxide, 0.5-10% of propylene oxide, and 0.2-0.6% of a weak acid neutralizer; the polycarboxylate water reducing agent phosphorylated monomer is simple in raw material component, can be further prepared into the polycarboxylate water reducing agent, can improve the workability of concrete when being applied to concrete construction engineering materials, has excellent adaptability to different cement, coal ash, concrete soil content, temperature and water consumption, meanwhile, the mixing amount sensitivity of the water reducing agent can be reduced, the water reducing rate of the water reducing agent can be improved, and early strength and shrinkage resistance can be achieved.

Description

technical field [0001] The invention relates to a block polyether and a preparation method thereof, in particular to a block polyether used for an early-strength anti-shrinkage polycarboxylate water reducer and a preparation method thereof. Background technique [0002] In recent years, with the continuous launch of national infrastructure construction and the formulation of urbanization policies and guidelines, the amount of concrete used in my country will continue to maintain a trend of rapid increase. At the same time, while meeting the requirements of existing engineering construction, the demand for high-performance concrete is becoming more and more intense, requiring concrete to have a better early strength development rate to improve the formwork turnover rate, or to meet the strength development under low temperature conditions, Extend the production period of precast concrete into late fall and even winter. For the production of prestressed high-strength pipe pil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/26C04B24/32C04B103/30
CPCC08G65/2639C04B24/32C04B2103/302
Inventor 郑建民鲍凤里余小荣谢中晖朱进建林春东张志良
Owner 广东奥克化学有限公司
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