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Preparation method of small molecule water reducer with slump retention, retardation and mud resistance

A water-reducing agent and small-molecule technology, applied in the field of preparation of small-molecule water-reducing agents, can solve the problems of complex polyethylene glycol terminal modification reaction, harsh and cumbersome post-treatment, etc., and achieve the effect of simple operation and convenient mass production.

Active Publication Date: 2020-11-17
ZHENJIANG SOBUTE NEW MATERIAL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN105542147B reported the preparation method and application of anti-mud type water reducer with hyperbranched structure, its anti-mud performance is obviously better than traditional polycarboxylic acid, but the post-treatment after the condition control of this method is more harsh and cumbersome
CN108239279A has reported the preparation method of the small molecule superplasticizer with retarding, slump-preserving and anti-mud performance, but this method involves comparatively complicated polyethylene glycol terminal modification reaction

Method used

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  • Preparation method of small molecule water reducer with slump retention, retardation and mud resistance
  • Preparation method of small molecule water reducer with slump retention, retardation and mud resistance
  • Preparation method of small molecule water reducer with slump retention, retardation and mud resistance

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Experimental program
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Effect test

Embodiment 1

[0030] Using dimethylethanolamine as a starting agent, polyethylene glycol E-1 with a theoretical average molecular weight of 4000 (measured weight average molecular weight of 4107) was prepared.

[0031] At 25 degrees, in the reactor, add 40 parts by mass of E-1, add water to form a solution with a mass concentration of 50%, add 15 parts by mass of sodium hydroxide, and drop 61.7 parts by mass of E-1 containing 3.7 parts by mass at a constant speed. Sodium sulfate solution I-1, after 8 minutes, began to drop at a constant speed into a 50% mixed aqueous solution M-1 containing 27 parts by mass of acrylic acid and 60 parts by mass of E-1. M-1 was added dropwise for 2.5h, and I-1 was added for 3h. After the dropwise addition is completed, neutralize and discharge the material. The weight average molecular weight of the product is 5039.

Embodiment 2

[0033] Using dimethylethanolamine as a starting agent to prepare polyethylene glycol E-2 with a theoretical average molecular weight of 2000 (measured weight average molecular weight 2061)

[0034] At 15 degrees, in the reactor, add 24 parts of mass E-2, add water to make a solution of 40% mass concentration, add 12.8 parts of mass of sodium hydroxide, and drop 96 parts of mass of E-2 containing 4.8 parts of Sodium sulfate solution I-1, after 5 minutes, began to drop at a constant speed a 40% mixed aqueous solution M-2 containing 23 parts by mass of acrylic acid and 56 parts by mass of E-2. M-2 was added dropwise for 1.5h, and I-2 was added dropwise for 1h45min. After the dropwise addition is completed, neutralize and discharge the material. The weight average molecular weight of the product is 2573.

Embodiment 3

[0036] Using triethanolamine as a starting agent, the preparation of polyethylene glycol E-3 with a weight average molecular weight of 6000 (measured weight average molecular weight 5963)

[0037]At 35 degrees, in the reactor, add 30 parts by mass of E-3, add water to form a solution with a mass concentration of 60%, add 21.2 parts by mass of sodium carbonate, and drop 40 parts by mass of E-3 containing 4.0 parts of persulfate Sodium solution I-3, after 15 minutes, began to drop at a constant speed into a 60% mass concentration mixed aqueous solution M-3 containing 28.8 parts by mass of acrylic acid and 90 parts by mass of E-3. M-3 was added dropwise for 3h, and I-3 was added for 3.5h. After the dropwise addition is completed, neutralize and discharge the material. The weight average molecular weight of the product is 7233.

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Abstract

The invention belongs to the technical field of building materials, and especially relates to a preparation method of a micro-molecular water reducer with slump retaining, setting retarding and mud resisting effects. Amine-initiated polyethylene glycol is used as a raw material, and a redox free radical reaction of an amino group in the molecule and persulfate is used to initiate graft polymerization of acrylic acid on carbon adjacent to tertiary amine in order to obtain the micro-molecular water reducer with an acrylic acid-polyethylene glycol block structure. The topology of the water reducer can be further adjusted by adjusting the number of polyethylene glycol side chains on amine nitrogen. The obtained water reducer has the block micro-molecular structure not contained by traditionalcomb-shaped structure polycarboxylic acids, and has a higher proportion of acid groups than the traditional comb-shaped structure polycarboxylic acids, so the water reducer has good long-time settingretarding, setting retarding and clay resisting effects.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of a small-molecule water reducer with slump-preserving, setting-retarding and anti-mud effects. Background technique [0002] Polycarboxylate high-performance water reducer (hereinafter referred to as polycarboxylate) is the type of concrete water reducer with the best water reducing performance and the most widely used in large-scale projects. In terms of molecular structure, polycarboxylic acid is based on acidic anionic monomers such as acrylic acid and methacrylic acid as the main chain, and polyethylene glycol is a comb-like topology of side chains. Although this structure endows polycarboxylic acid with excellent water-reducing performance, but it also makes it easy to intercalate with some lamellar compounds to cause failure, the most typical of which is clay. Due to the vast territory of our country, the sources of concrete ag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F283/06C08F220/06
Inventor 严涵杨勇周栋梁于诚张倩倩刘金芝冉千平刘加平
Owner ZHENJIANG SOBUTE NEW MATERIAL CO LTD
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