Super-efficient carboxylic acid water reducer without thermal energy consumption

A super-efficient carboxylic acid and water-reducing agent technology, which is applied in the field of concrete admixtures, can solve the problems of poor cement adaptability, heat energy consumption, etc., and achieve high water-reducing performance, short production time, and improved performance.

Inactive Publication Date: 2011-09-07
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of these high-efficiency polycarboxylate superplasticizers is poor adaptability to cement, the maximum water-reducing rate does not exceed 40%, and there is heat energy consumption in production.

Method used

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  • Super-efficient carboxylic acid water reducer without thermal energy consumption
  • Super-efficient carboxylic acid water reducer without thermal energy consumption
  • Super-efficient carboxylic acid water reducer without thermal energy consumption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 Preparation of water reducer of the present invention

[0031] Preparing the base material: Stir and dissolve the isopentenyl polyether and water together to prepare 220 g of a 60% aqueous solution.

[0032] Preparation of material B: pre-mix acrylic acid and water into 27g of 77% aqueous solution;

[0033] Preparation of material A: the initiator ammonium persulfate is preformulated into 30 g of an aqueous solution with a concentration of 0.15%, and then 0.1-0.3 g of a molecular weight modifier vinyl acetate and 0.3-0.5 g of hydrogen peroxide (30%) are added in sequence and stirred evenly.

[0034] At 30°C (temperature fluctuation is controlled within ±1°C), add material A and material B dropwise to the bottom material at the same time, the dropping time of material A is controlled at 1.5 hours, and the dropping time of material B is controlled at 1.0 hour; material A After the dropwise addition, keep warm for 0.5-1.0 hours, then add water and stir evenly...

Embodiment 2

[0035] Embodiment 2 Preparation of water reducer of the present invention

[0036] Preparing the base material: First, stir and dissolve the isopentenyl polyether and water together to prepare 264 g of a 50% aqueous solution.

[0037] Preparation of material B: 29.7g of a 70% aqueous solution was pre-formulated with acrylic acid and water;

[0038] Prepare material A: preformulate the initiator ammonium persulfate into 30 g of an aqueous solution with a concentration of 0.2%, and then add 0.1 to 0.3 g of the molecular weight regulator mercaptopropionic acid and 0.2 to 0.4 g of hydrogen peroxide (30%) in sequence, and stir evenly.

[0039] At 25°C (temperature fluctuation is controlled within ±1°C), material A and material B are added dropwise to the bottom material at the same time, the dropping time of material A is controlled at 3.5 hours, the dropping time of material B is controlled at 3.0 hours, and the dropping time of material A is controlled at 3.0 hours. After the dr...

Embodiment 3

[0040] Embodiment 3 Preparation of water reducer of the present invention

[0041] Preparing the base material: Stir and dissolve the isopentenyl polyether and water together to prepare 240 g of a 55% aqueous solution.

[0042] Preparation of material B: pre-mix acrylic acid and water into 26g of 80% aqueous solution;

[0043] Preparation of material A: The initiator ammonium persulfate is pre-formulated into 30g of an aqueous solution with a concentration of 0.18%, and then sequentially add 0.3-0.6g of molecular weight modifier sodium methacrylate sulfonate, 0.15-0.45g of hydrogen peroxide (30%), and stir well .

[0044] At 20°C (the temperature fluctuation is controlled within ±1°C), add material A and material B dropwise to the bottom material at the same time, the dropping time of material A is controlled at 3.5 hours, the dropping time of material B is controlled at 3.0 hours, and the dropping time of material A is controlled at 3.0 hours. After the dropwise addition, k...

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Abstract

The invention relates to a super-efficient carboxylic acid water reducer without thermal energy consumption, which belongs to concrete admixtures. The super-efficient carboxylic acid water reducer is prepared by polymerizing small polymerizable organic acid monomers, with carboxyl groups, with large polymerizable polyether monomers, with long chains, under the normal temperature of 20 DEG C to 35 DEG C. The super-efficient carboxylic acid water reducer has advantages of simple reaction, no thermal energy consumption, short reaction time, safety in the production process and no pollution. The water reduction ratio is up to between 45% and 50%. By adopting the super-efficient carboxylic acid water reducer, the blended quantity of mineral blending materials in the concrete can be increased properly, the cost of construction materials is lowered, the performance of the concrete is enhanced, and the comprehensive cost performance is enhanced. The super-efficient carboxylic acid water reducer is widely applied in the preparation of ultra-durable concrete.

Description

technical field [0001] The invention relates to an admixture for concrete, in particular to a super-efficient carboxylic acid water reducer synthesized at room temperature. Background technique [0002] Polycarboxylate comb-shaped polymer admixture is a new generation of polycarboxylate superplasticizer (PC) developed by Japan, the United States and Europe since the 1980s. Its structure is characterized by a comb-shaped grafted long-chain macromolecular structure. The chain has dense carboxylic acid groups, and the branched chain of the molecule is a non-ionic polyethylene glycol chain. The molecule uses the long hydrophilic side chain to provide the steric hindrance effect and the dense carboxylic acid group on the main chain and the cement particles. The "anchor" effect between them produces high water reduction, low dosage, and high slump performance, which has gradually been widely recognized by the concrete industry. , the comb-shaped polymer has a great advantage in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F290/06C04B103/30
Inventor 段国荣黄国泓龚英李爱梅
Owner NANJING RUIDI HIGH TECH
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