Viscosity-control type polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylic acid and water reducer, which is applied in the field of concrete admixtures, can solve problems such as retention and performance affecting stability, and achieve the effects of improved flow performance, stable performance and good working performance

Active Publication Date: 2014-02-05
CHINA BUILDING MATERIALS ACAD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] It can be seen that the existing technologies are still at the compounding and mixing level of the viscosity modifi

Method used

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  • Viscosity-control type polycarboxylate superplasticizer and preparation method thereof
  • Viscosity-control type polycarboxylate superplasticizer and preparation method thereof
  • Viscosity-control type polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
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Embodiment 1-13

[0030] Example 1-13, Preparation of viscosity-adjusting polycarboxylate superplasticizer (VCPC)

[0031] Examples 1-13 The raw material formula and main process parameters of the viscosity-adjusting polycarboxylate water reducer are shown in Table 1:

[0032] Table 1 Example 1-13 Raw material formula and main process parameters of viscosity-adjusting polycarboxylate superplasticizer

[0033]

[0034]

[0035] Embodiment 1-13 Preparation of viscosity-adjusting polycarboxylate water reducer:

[0036] 1) Preparation of viscosity-adjusting monomer C: Prepare a surfactant aqueous solution with a concentration of 0.2-6g / L; according to the dosage of viscosity-adjusting monomer (C) listed in Table 1, dissolve in 30-60mL of surfactant aqueous solution (dosage 2wt% of the mass of the viscosity adjusting monomer). The surfactant can be one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, spanner type surfactant, tween type surfactant, etc., and it is used here...

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Abstract

The invention discloses a viscosity-control type polycarboxylate superplasticizer and a preparation method thereof. The method includes: mixing 2-10wt% of an unsaturated acid monomer (A), 18-45wt% of an unsaturated polyoxyethylene macromonomer (B), 1-5wt% of a viscosity-control monomer (C) and the balance water (a total weight of 100%), then adding the mixture into a reaction kettle, adding an initiator solution dropwisely for 2-4h under 70-90DEG C to trigger polymerization, further performing heat preservation reaction for 1-3h under 70-90DEG C, then carrying out natural cooling to 45DEG C, and adjusting the pH value to 6.0-8.0, thus obtaining the viscosity-control type polycarboxylate superplasticizer. The viscosity-control type polycarboxylate superplasticizer has stable performance, and the dosage of each raw material component can be adjusted according to needs, so that the flowability and viscosity requirements of construction concrete can be satisfied, and the bleeding and segregation problems of fresh concrete are solved. The viscosity-control type polycarboxylate superplasticizer provided by the invention has the advantages of easily available raw materials, simple preparation process, cleanliness and safety, easy industrial production and the like, and has broad industrial application prospects.

Description

technical field [0001] The invention belongs to the concrete admixture in the field of building materials, in particular to a polycarboxylate water reducer for adjusting the viscosity of construction concrete and a preparation method thereof. Background technique [0002] In today's concrete industry, it has become a consensus to improve the strength and durability of concrete, especially high-strength concrete (≥C60, C60 means that the compressive strength of concrete under standard curing conditions for 28 days is not less than 60MPa) and ultra-high-strength concrete (≥C100 , C100 means that under standard curing conditions, the compressive strength of concrete in 28 days is not less than 100MPa) The large demand makes the rapid development of concrete technology. In the preparation of high-strength concrete and ultra-high-strength concrete, the amount of cementitious materials is large and the water gel is relatively low. High-volume polycarboxylate superplasticizers are ...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F220/06C08F222/02C08F220/18C08F220/22C08F226/02C08F220/54C08F220/60C04B103/30
Inventor 高瑞军王玲高春勇
Owner CHINA BUILDING MATERIALS ACAD
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