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Preparation method for super early-strength type poly carboxylic acid admixture

A super-early-strength type and admixture technology, applied in the field of concrete admixtures, can solve problems such as poor cement adaptability, achieve high cement adaptability, high water reducing rate, and improve the effect of early strength

Active Publication Date: 2014-04-16
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims at the problem of poor cement adaptability of existing super-early-strength polycarboxylate admixtures, and provides a novel super-early-strength polycarboxylate admixture and a preparation method thereof

Method used

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  • Preparation method for super early-strength type poly carboxylic acid admixture
  • Preparation method for super early-strength type poly carboxylic acid admixture
  • Preparation method for super early-strength type poly carboxylic acid admixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Add 300g of distilled water and 143.6g of polyether macromonomer c-1 into a 1L glass round-bottom flask equipped with a thermometer, stirrer, dropping funnel and nitrogen gas conduit, stir and raise the temperature to dissolve, and purge the round-bottom flask with nitrogen to remove oxygen in the system. Under the protection of nitrogen, the temperature was raised to 90°C, and then 3.9g of monomer a-1, 32.4g of monomer b-1, 1.78g of 3-mercaptopropionic acid and 150g of water were mixed and stirred to form a uniform monomer aqueous solution, which was uniformly Added dropwise to a round bottom flask for 5h. At the same time, an aqueous initiator solution prepared by 260 g of distilled water and 3.56 g of potassium persulfate was added dropwise at a constant speed for 5.5 hours. After adding the whole solution dropwise, keep the constant temperature for 6 hours, then lower the temperature to about 40°C, add sodium hydroxide to neutralize to pH=7.5, and obtain the super ...

Embodiment 2

[0049] Add 260g of distilled water and 261.2g of polyether macromonomer c-2 into a 1L glass round-bottom flask equipped with a thermometer, stirrer, dropping funnel and nitrogen gas conduit, stir and raise the temperature to dissolve, and purge the round-bottom flask with nitrogen to remove oxygen in the system. Under the protection of nitrogen, the temperature was raised to 80°C, and then 20.2g of monomer a-2, 10.6g of monomer a-4, 16.1g of monomer b-2, 0.62g of mercaptoacetic acid and 120g of water were mixed and stirred to form a uniform monomer The aqueous solution was added dropwise to the round bottom flask at a constant speed for 4 hours. At the same time, an aqueous initiator solution prepared by 180 g of distilled water and 1.54 g of azobisisobutylamidine hydrochloride was added dropwise at a constant speed for 4.5 hours. After the addition of the whole solution, continue to keep the constant temperature for 5 hours, then lower the temperature to about 40°C, add trie...

Embodiment 3

[0051] In a 1L glass round-bottomed flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen conduit, add 360g of distilled water, 264.2g of polyether macromonomer c-3 and 1.41g of 30% hydrogen peroxide, stir and heat up to dissolve, The round bottom flask was purged with nitrogen to remove the oxygen in the system. Under nitrogen protection, heat up to 35°C, then mix and stir 28g of monomer a-3, 22.3g of monomer b-1, 25.4g of monomer b-3, 0.18g of mercaptoethanol, 0.23g of L-ascorbic acid and 190g of water A homogeneous monomer aqueous solution was prepared, which was added dropwise to a round bottom flask at a constant speed for 2 hours. After the dropwise addition of the monomer solution, continue to keep the constant temperature for 4 hours, then lower the temperature to about 30°C, add potassium hydroxide to neutralize to about pH=7.5, and obtain the super early strength polycarboxylic acid admixture PC-3 with a solid content of 39.3%. , GPC test th...

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Abstract

The invention provides a super early-strength type poly carboxylic acid admixture and a preparation method thereof. A molecule main chain of the admixture simultaneously contains carboxylic acid radicals and sulphonic acid radical internal salt, and a side chain of the admixture adopts long-chain polyether. The preparation method of the super early-strength type poly carboxylic acid admixture comprises the steps as follows: a carboxylic acid monomer, a sulfoacid quaternary ammonium salt amphoteric monomer and a high molecular weight polyether large monomer perform a free radical copolymerization reaction, the copolymerization proportion of the three monomers and the average molecular weight of the copolymer are reasonably controlled, and the poly carboxylic acid admixture provided with water reduction and super early-strength performance is prepared. The admixture has a higher water reduction rate, can accelerate the process of early hydration of cement, facilitates the improvement on the early strength of a cement base material, meanwhile has stronger raw material adaptability, and always shows a better super early-strength effect in different kinds of cement.

Description

technical field [0001] The invention relates to a polycarboxylic acid admixture for super early strength concrete and a preparation method thereof, belonging to the technical field of concrete admixtures. Background technique [0002] Polycarboxylic acid admixture is a kind of copolymer with comb structure, which is mainly prepared by free radical copolymerization of unsaturated carboxylic acid and unsaturated reactive polyether macromonomer. When it is applied to concrete, its main function is reflected in two aspects: high water reducing rate and excellent slump retention performance. However, more and more studies have shown that by introducing functional small monomers or changing the molecular structure, polycarboxylic acid admixtures can be endowed with more new properties, such as reducing the shrinkage of concrete, improving the early strength or later strength of concrete, reducing the viscosity of concrete etc. Based on the strong designability and changeable mol...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/28C08F220/06C08F222/02C08F220/38C08F216/14C08F2/38C04B24/16C04B103/30
Inventor 杨勇冉千平刘加平张建纲于诚刘金芝周栋梁
Owner JIANGSU SOBUTE NEW MATERIALS
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