Room-temperature preparation method of early strength type polycarboxylate superplasticizer

A technology of polycarboxylic acid and water reducing agent, applied in the field of concrete admixture, can solve the problems of being unsuitable for large-scale promotion of industrial production, unsuitable for industrial production, complex production process, etc., and achieves fast growth and termination of free radicals, raw materials The effect of low price and simple production process

Inactive Publication Date: 2016-01-20
CHINA TIESIJU CIVIL ENG GRP CO LTD +1
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  • Abstract
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  • Application Information

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Problems solved by technology

This method requires esterification at 100-140°C and polymerization at 65-80°C. It is produced by a high-temperature two-step method. The production process is complicated and it is not suitable for large-scale promotion of industrial production.
In the patent CN103450408A, a preparation method of an ether early-strength polycarboxylate water reducer is disclosed, which consists of unsaturated ester, diethanol monoisopropanolamine, 2-acrylamido-methylpropanesulfonic acid and ...

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  • Room-temperature preparation method of early strength type polycarboxylate superplasticizer
  • Room-temperature preparation method of early strength type polycarboxylate superplasticizer
  • Room-temperature preparation method of early strength type polycarboxylate superplasticizer

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Embodiment Construction

[0035] The above-mentioned normal temperature early-strength polycarboxylate superplasticizer provided by the present invention, the early-strength agent of Comparative Example 3 and the same type of products in the market are tested according to the fluidity of the clean slurry (GB / T8077-2000): using benchmark cement, according to GB / T8077-87 tests the fluidity of cement paste, and the test results are shown in Table 1 below.

[0036] Table 1 Clean pulp performance test results

[0037]

[0038] The above-mentioned normal temperature early-strength polycarboxylate water-reducer given by the present invention is compared with the early-strength agent of Comparative Example 3 and the same type of products on the market. The concrete formula is: conch PO 42.5 cement: fly ash: sand : Pebble: Water: Admixture = 547.5: 97.5: 1020: 1530: 195: 6.45. The comparison results are shown in Table 2 below.

[0039] Table 2 Concrete performance comparison results

[0040]

[0041] ...

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Abstract

The invention discloses a room-temperature preparation method of an early strength type polycarboxylate superplasticizer. The early strength type polycarboxylate superplasticizer is prepared from three water soluble monomers including 80wt%-90wt% of methyl allyl polyethenoxy ether, 6wt%-13wt% of acrylic acid and 4wt%-7wt% of acrylamide, sodium methallyl sulfonate is preferably taken as a chain transfer agent, the monomers are copolymerized by a hydrogen peroxide-vitamin C redox initiation system with a single-tank segmented dripping method at the room temperature, and the early strength type polycarboxylate superplasticizer is prepared. The early strength type polycarboxylate superplasticizer is produced with a room-temperature one-step method, the production technology is simple, requirements for production equipment are low, and the method is suitable for production of zero-heat-source early strength type polycarboxylate superplasticizers. The early strength type polycarboxylate superplasticizer prepared with the method has high water reducing rate and good early strength effect and is suitable for production of concrete for metro segments, other prefabricated parts and the like requiring for the early strength performance.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a preparation method of a normal-temperature early-strength polycarboxylate water reducer. Background technique [0002] As a commonly used building material, concrete has been widely used in various fields with the rapid development and continuous improvement of its technology. Followed by the continuous improvement of the performance requirements of concrete. It has excellent and easy performance, convenient pumping construction, super early strength, high strength, high durability and other properties have attracted widespread attention. Early-strength and ultra-early-strength concrete have broad market application prospects in prestressed high-strength pipe columns, bridges, highways, ports and their maintenance and reinforcement. In traditional concrete design, the strength of concrete is generally increased by reducing the water-binder ratio, increasing the strength gra...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/56C08F4/40C04B24/26C04B103/30
Inventor 黄海汪志勇滕茂茁陈娟李双王亮
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD
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