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Isobutylene polyether polycarboxylic water reducer and preparation method thereof

An isobutylene-based polyether and polycarboxylic acid-based technology, applied in the field of concrete admixtures, can solve the problems affecting the cost performance and market competitiveness of water reducers, the high price of isopentenol, and narrow source channels, etc., to achieve high cost performance, The effect of slump-proof cement adaptability and high cement adaptability

Inactive Publication Date: 2012-07-18
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The block-type polyoxyalkylene ether monomers used in the above patents are all polymers of prenyl alcohol, ethylene oxide, and propylene oxide. Because of the high price of prenyl alcohol, narrow source channels, and insufficient supply, it affects the The cost performance and market competitiveness of this kind of polycarboxylate water reducer

Method used

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  • Isobutylene polyether polycarboxylic water reducer and preparation method thereof
  • Isobutylene polyether polycarboxylic water reducer and preparation method thereof
  • Isobutylene polyether polycarboxylic water reducer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1: Monomer A is isobutenyl polyoxyethylene polyoxypropylene ether, molecular weight is 2400; Monomer B is acrylic acid; Initiator D is "H 2 o 2 -VC" redox system, the chain transfer agent E is thioglycolic acid.

[0031] Dissolve 16.08kg of monomer B and 1.62kg of chain transfer agent E in 40kg of distilled water as solution 1#. Dissolve 0.81kg VC (ascorbic acid) in 40kg distilled water as solution 2#. Add 124.20kg of monomer A, 3.02kg of H into the reactor 2 o 2 Mix with 131kg of distilled water, stir to dissolve, then raise the temperature to 62±2°C, start to add solution 1# and solution 2# dropwise at the same time, the dropping time of solution 1# and 2# is 3.5h and 4h, and continue to react for 1h after the dropwise addition is completed . After the reactants are cooled, adjust the pH to 6-8 with 40% sodium hydroxide solution to obtain polycarboxylate water reducer PC-1 with a solid content of 40%.

Embodiment 2

[0032] Example 2: Monomer A is isobutylene polyoxyethylene polyoxypropylene ether with a molecular weight of 2400; Monomer B is acrylic acid; Monomer C is sodium methacrylic sulfonate; Initiator D is ammonium persulfate.

[0033] Dissolve 15.6kg of monomer B in 18.5kg of distilled water as solution 1#. Dissolve 1.25kg of ammonium persulfate in 22.1kg of distilled water as solution 2#. Add 136.2kg of monomer A, 2.55kg of sodium methacrylate and 149.4kg of distilled water into the reaction kettle, stir to dissolve, then raise the temperature to 64±2°C, and start adding solution 1# and solution 2# dropwise at the same time, solution 1# The dropwise addition time of and 2# is 3.0h and 3.5h, and the reaction is continued for 2.5h after the dropwise addition is completed. After the reactant is cooled, adjust the pH to 6-8 with 45% sodium hydroxide solution to obtain the polycarboxylate water reducer PC-2 with a solid content of 45%.

Embodiment 3

[0034] Example 3: Monomer A is isobutylene polyoxyethylene polyoxypropylene ether with a molecular weight of 2400; monomer B is acrylic acid; initiator D is ammonium persulfate, and chain transfer agent E is mercaptopropionic acid.

[0035]Dissolve 12.4kg of monomer B and 0.75kg of chain transfer agent E in 40.6kg of distilled water as solution 1#. Dissolve 1.2kg of ammonium persulfate in 43.9kg of distilled water as solution 2#. Add 82.7kg of monomer A and 140.2kg of distilled water into the reaction kettle, stir to dissolve, then raise the temperature to 62±2°C, start to drop solution 1# and solution 2# at the same time, the dropping time of solution 1# and 2# is 2.5 h and 3.0h, continue to react for 2.0h after the dropwise addition. After the reactant is cooled, adjust the pH to 6-8 with 30% sodium hydroxide solution to obtain the polycarboxylate water reducer PC-3 with a solid content of 30%.

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Abstract

The invention discloses an isobutylene polyether polycarboxylic water reducer and a preparation method thereof, and belongs to the field of cement concrete water reducers. The polycarboxylic water reducer takes isobutylene polyoxyethylene polyoxypropylene ether with low cost and a broad source as a block polyoxyalkylene ether monomer. According to the preparation method, water is taken as a solvent, free radicals of the block polyoxyalkylene ether monomer A, an unsaturated acid or unsaturated acid derivative monomer B and an alkenyl sulfonic acid monomer C are polymerized under the action of an initiator D and a chain transfer agent E, and a solution is neutralized by an alkaline solution to obtain the polycarboxylic water reducer. The polycarboxylic water reducer prepared by the method is low in cost, has broad raw material source, high cost performance, high market competitiveness, low dosage, high water reducing performance, low slump loss, high cement adaptability and the like, and is moderate in reaction condition and low in requirement on equipment; and moreover, the raw materials are polymerized in an aqueous solution, so that the emissions of waste gases, waste water and industrial residues are avoided, and the preparation of the polycarboxylic water reducer belongs to clean production.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and relates to an isobutylene-based polyether polycarboxylate water reducer and a preparation method thereof. Background technique [0002] High-performance concrete is widely used around the world due to its high strength, high durability, high workability and volume stability. Among them, water reducing agent is one of the five indispensable components of high-performance concrete. Polycarboxylate superplasticizer has the advantages of low dosage, high water reducing rate, large degree of freedom in molecular structure design, and environmental friendliness. focus of development. [0003] At present, there are two methods for producing polycarboxylate-based water reducers—one-step method and two-step method. Among them, the one-step method has become a hot spot in the synthesis of polycarboxylic acid-based water reducers due to its simple process, easy operation, easy control, sho...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F228/02C04B24/16C04B24/26C04B103/30
Inventor 张志宾熊国宣罗明标刘云海花榕
Owner EAST CHINA UNIV OF TECH
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