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A star-shaped amphoteric polycarboxylate water reducer with high-efficiency mud resistance and its preparation method

A technology of amphoteric polycarboxylic acid and water reducing agent, applied in the field of star-shaped amphoteric polycarboxylic acid water reducing agent and its preparation, polycarboxylate water reducing agent and its preparation field, to achieve strong dispersing ability, high adaptability and dispersibility , the effect of improving adaptability

Active Publication Date: 2021-06-25
SHANDONG JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 amphoteric polycarboxylate water reducer with high-efficiency mud resistance and its preparation method
  • A star-shaped amphoteric polycarboxylate water reducer with high-efficiency mud resistance and its preparation method
  • A star-shaped amphoteric polycarboxylate water reducer with high-efficiency mud resistance and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of star chain transfer agent

[0034] 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.

[0035] β-cyclodextrin (11.35g, 0.01mo) was dissolved in 60mL of anhydrous N,N-dimethylformamide (DMF), added to a 100mL three-necked flask, and the...

Embodiment 2

[0043] This example prepares star-shaped amphoteric polycarboxylate superplasticizer (marked as SZP2) in the same manner as Example 1, the only difference being that the amount of methacryloyloxyethyltrimethylammonium chloride is 0.1mol, so that the chain The molar ratio of transfer agent, initiator, polyethylene glycol methacrylate, methacrylic acid and methacryloxyethyltrimethylammonium chloride is 1:7:35:105:10.

[0044] 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

[0046] In this example, a star-shaped amphoteric polycarboxylate superplasticizer (marked as SZP3) 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.

[0047] 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 amphoteric polycarboxylate water reducer with high-efficiency mud resistance and a preparation method thereof. Reversible addition-fragmentation chain transfer agent (RAFT reagent) of the shape structure, under the action of chain transfer agent and initiator, initiate (meth)acrylic acid polyethylene glycol ester, (meth)acrylic acid and (meth)acryloyl The RAFT polymerization of oxyethyltrimethylammonium chloride produces a star-shaped amphoteric copolymer, and after further processing, a star-shaped amphoteric polycarboxylate superplasticizer with a solid content of 20% and high anti-mud effect is obtained. The polycarboxylate water-reducer prepared by the invention has a high water-reducing rate, has high-efficiency anti-mud effect, and can meet higher construction requirements.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer and a preparation method thereof, in particular to a star-shaped amphoteric polycarboxylate water reducer with high-efficiency mud resistance and a preparation method thereof, belonging to the technical field of concrete admixtures in building materials. Background technique [0002] Polycarboxylate superplasticizer, as the third generation of high-performance concrete 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 used in a series of major projects such as high-speed railways, bridges, and tunnels. [0003] Polycarboxylate high-efficiency superplasticizers also encounter many technical difficulties in practical applications, such as adaptability to cement / admixtures, sensitivity to superplasticizer dosage and water consum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/34C08F2/38C04B24/32C04B103/30
CPCC04B24/32C04B2103/302C08F2/38C08F283/065C08F2438/03C08F220/06
Inventor 唐新德胡秀颖徐大举徐静庞来学周德杰王可良
Owner SHANDONG JIAOTONG UNIV
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