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Polycarboxylate superplasticizer and rapid synthesis method thereof at normal temperature

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of polycarboxylic acid water reducing agent and its rapid synthesis at room temperature, which can solve the problems of high energy consumption and long reaction time, and achieve faster speed, excellent water reduction and slump retention performance effect

Pending Publication Date: 2019-12-20
GUIZHOU DR SHI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current preparation method of polycarboxylate superplasticizer at low temperature / normal temperature has a long reaction time, and the reaction time of ordinary polymerization initiation system needs at least 2-10h; the synthesis of polycarboxylate superplasticizer by high temperature method can shorten the reaction time, However, the reaction temperature is generally above 40°C, and the energy consumption is relatively high.

Method used

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  • Polycarboxylate superplasticizer and rapid synthesis method thereof at normal temperature

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Experimental program
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Effect test

Embodiment 1

[0025] Prepare raw materials: 100 parts of GPEG polyether macromonomer, 0.5 part of oxidizing agent (hydrogen peroxide), 0.58 part of metal accelerator (FeSO4), 0.7 part of chain transfer agent (mercaptopropionic acid), unsaturated carboxylic acid small monomer (acrylic acid) 8 parts, 0.1 parts of reducing agent (E51).

[0026] Synthetic steps:

[0027] (1) Add 100 parts of GPEG polyether macromonomer into 67 parts of tap water to dissolve as the bottom liquid, stir and dissolve into a uniform and transparent solution, then add 0.6 parts of hydrogen peroxide with a mass fraction of 25-30% in the bottom liquid , the preferred mass fraction is 27.5% hydrogen peroxide and 0.58 parts mass fraction is 0.5-1% FeSO4 solution.

[0028] (2) Dissolve 8 parts of acrylic acid and 0.7 parts of mercaptopropionic acid in 10-12 parts of tap water to make dropwise solution A, and dissolve 0.1 part of E51 in 20-22 parts of tap water to make dropwise solution B for later use.

[0029] (3) Add ...

Embodiment 2

[0032] Prepare raw materials: 95 parts of GPEG polyether macromer, 0.58 part of oxidant (hydrogen peroxide), 0.5 part of metal accelerator (FeSO4), 0.4 part of chain transfer agent (mercaptopropionic acid), unsaturated carboxylic acid small monomer (acrylic acid) 9 parts, 0.09 parts of reducing agent (E51).

[0033] The synthesis steps are consistent with Example 1.

Embodiment 3

[0035] Prepare raw materials: 120 parts of GPEG polyether macromonomer, 0.7 part of oxidant (hydrogen peroxide), 0.7 part of metal accelerator (FeSO4), 0.8 part of chain transfer agent (mercaptopropionic acid), unsaturated carboxylic acid small monomer (acrylic acid) 15 parts, 0.15 parts of reducing agent (E51).

[0036] The synthesis steps are consistent with Example 1.

[0037] The samples synthesized in Examples 1-3 were compared with commercially available common polycarboxylate water reducers for concrete performance tests. Conch 42.5 cement is used; Class II fly ash; sand: machine-made sand, fineness modulus 2.60; crushed stone: particle size 5-30mm; concrete mix ratio is shown in Table 1.

[0038] Table 1: Concrete test mix ratio kg / m3

[0039] cement coal ash sand gravel water 280 90 902 977 160

[0040] According to GB-8077-2012 "Concrete Admixture Homogeneity Test Method", under the same test conditions, the initial slump / expansion of ...

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Abstract

The invention discloses a polycarboxylate superplasticizer, which mainly comprises a GPEG polyether macromonomer, an oxidizing agent, a metal accelerant, a chain transfer agent, an unsaturated carboxylic acid small monomer, a reducing agent and the like. The invention also discloses a rapid synthesis method of the polycarboxylate superplasticizer at normal temperature. The method adopts a novel polyether (GPEG) with a molecular weight of 2000-3000, and the monomer belongs to a novel monomer with a 2+2 structure, and can be polymerized with an unsaturated acid small monomer under the conditionthat a chain transfer agent, an oxidizing agent and a reducing agent are added. The double-bond structure of the monomer has higher activity than the double-bond activity of a traditional polyether macromonomer, therefore the polymerization reaction can be completed at normal temperature, and the reaction time is shorter, thus saving the production cost. The metal accelerant is added in the polymerization reaction, thus facilitating easier polymerization reaction at normal temperature, and accelerating the polymerization reaction. Compared with commercially available water reducing agents, thesuperplasticizer obtained by polymerizing the high-activity polyether with the unsaturated carboxylic acid small monomer has more excellent water reducing and slump retaining properties.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a polycarboxylate water reducer and a rapid synthesis method thereof at normal temperature. Background technique [0002] Polycarboxylate water reducer is the third generation of high performance concrete water reducer developed after the common water reducer represented by lignin and the naphthalene series high performance water reducer. Slump retention has been widely favored by the concrete engineering community. The molecular structure of polycarboxylate superplasticizer contains carboxylic acid, which is a kind of graft copolymer. Its branched chain structure features are more obvious, generally it is "grafted" branched chain or "comb-shaped" formed by polyoxyethylene. Branched chain, this form of composition is conducive to improving the surface activity of molecular functional groups. In recent years, institutions with enterprises as the main body have active...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F2/38C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F2/38C08F283/06C08F220/06
Inventor 陈杰
Owner GUIZHOU DR SHI TECH
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