A star-shaped block polycarboxylate water reducer and its preparation method

A technology of water reducing agent and polycarboxylic acid, applied in the field of water reducing agent and its preparation, star-shaped block polycarboxylate water reducing agent and its preparation field, to achieve the advantages of controllable molecular weight, high water reducing rate and increasing adsorption capacity. Effect

Active Publication Date: 2019-05-17
山东江泰建材科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the search found that most of the polycarboxylate superplasticizers described in the current patents mainly achieve the anti-mud effect by adjusting the content of their own components or compounding with anti-mud agents. Few of them change the polymer structure through molecular structure design or adopt new ones. polymerization method to achieve its excellent application performance

Method used

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  • A star-shaped block polycarboxylate water reducer and its preparation method
  • A star-shaped block polycarboxylate water reducer and its preparation method
  • A star-shaped block polycarboxylate water reducer and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Preparation of Star Chain Initiator

[0030] Potassium O-ethylxanthate (16.03 g, 0.1 mol) was dissolved in 80 mL of anhydrous tetrahydrofuran (THF), added to a 150 mL three-neck flask, and then triethylamine (10.1, 0.1 mol) was added as a proton absorber. Stir in an ice-water bath for 0.5 h under nitrogen atmosphere. 2-Bromopropionyl bromide (26.1 g, 0.1 mol) was dissolved in 20 mL of anhydrous THF, then added to a constant pressure dropping funnel, and added drop by drop into a three-necked flask. After the dropwise addition was completed, the reaction was carried out at room temperature for 24 h under nitrogen atmosphere. After the reaction is finished, the reaction solution is filtered, and the filtrate is rotary evaporated to remove the solvent to obtain a dithioester compound containing an acid bromide group.

[0031] β-cyclodextrin (11.35g, 0.01mol) was dissolved in 60mL of anhydrous N,N-dimethylformamide (DMF), added to a 100mL three-necked flask, and then ...

Embodiment 2

[0039] In this example, a star-shaped block polycarboxylate water reducer (marked as SP2) was prepared in the same manner as in Example 1, except that the molecular weight of polyethylene glycol methacrylate in step (2) was 1000 g / mol.

[0040] In this embodiment, the slurry fluidity and soil resistance performance are tested in the same manner as in Example 1, and the test results are shown in Table 1.

Embodiment 3

[0042] In this example, a star-shaped block polycarboxylate water reducer (marked as SP3) was prepared in the same manner as in Example 1, except that the molecular weight of polyethylene glycol methacrylate in step (2) was 500 g / mol.

[0043] In this embodiment, the slurry fluidity and soil resistance performance are tested in the same manner as in Example 1, and the test results are shown in Table 1.

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Abstract

The invention discloses a star-shaped block polycarboxylic acid water reducing agent and a preparation method thereof. The preparation method comprises the following steps: enabling beta-cyclodextrin and a dithioesters compound containing acyl halide groups to react to obtain a star-shaped structure reversible addition-fragmentation chain transfer agent (RAFT reagent); and under the effect of the transfer agent and an initiator, successively initiating RAFT polymerization of (methyl)acrylate macrogol ester and (methyl) acrylate to obtain a star-shaped block polymer, and further treating the star-shaped block polymer to obtain the star-shaped block poolycarboxylic acid water reducing agent with a solid content of 20 percent. The water reducing agent prepared by the invention has the advantages of controllable molecular structure, high water reducing rate, good mobility, good dispersity, high applicability to soil and the like, can meet high construction requirements and is wide in application prospect.

Description

technical field [0001] The invention relates to a water reducer and a preparation method thereof, in particular to a star-shaped block polycarboxylate water reducer and a preparation method thereof, belonging to the technical field of concrete admixtures in building materials. Background technique [0002] Polycarboxylate superplasticizer has outstanding advantages such as low dosage, high water reducing rate, good slump retention performance, strong molecular structure adjustability, and high performance potential. It has been successfully applied as the third generation of high-performance concrete superplasticizer In a series of major projects such as high-speed railways, bridges, and tunnels. At present, the preparation of polycarboxylate superplasticizers is mainly based on traditional free radical polymerization technology, but due to the nature of free radical polymerization (slow initiation, fast growth, easy chain transfer and chain termination, etc.), the polymeriz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F2/38C04B24/26C04B103/30
CPCC04B24/2605C04B2103/0059C04B2103/302C08F2/38C08F283/065C08F220/06
Inventor 唐新德杨月青徐静董福营胡秀颖庞来学韩念风
Owner 山东江泰建材科技有限公司
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