A kind of polycarboxylate superplasticizer and preparation method thereof

A high-efficiency water reducer and polycarboxylic acid technology, applied in the field of polycarboxylate high-efficiency water reducer and its preparation, can solve the problems of insufficient steric hindrance and electrostatic repulsion, high polymerization temperature, self-polymerization reaction, etc., to achieve Increase market share and share, improve work performance, and improve the effect of steric hindrance

Active Publication Date: 2018-11-06
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the comb-shaped polymer can be used to synthesize a polycarboxylate water reducer with a comb-shaped structure, due to its single material and high polymerization temperature, self-polymerization is very likely to occur, and the molecular structure of the synthesized polycarboxylic acid is too simple to be used. Fully provide effective steric hindrance and electrostatic repulsion, not beyond the scope of traditional comb structure

Method used

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  • A kind of polycarboxylate superplasticizer and preparation method thereof
  • A kind of polycarboxylate superplasticizer and preparation method thereof
  • A kind of polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of the polycarboxylate high-efficiency water reducer in this embodiment is as follows:

[0038]Put 120g of TPEG-2400, 10g of PEG-200 and 50g of water in a four-necked flask and mix and stir, then add 0.1g of dibutyltin dilaurate, 1.2g of p-toluenesulfonic acid and 34g of hydrogen peroxide to obtain component A; g acrylic acid, 1.02g Vc and 10g water are mixed to obtain component B; 0.384g sodium methacrylate sulfonate, 0.3g ammonium persulfate and 20g water are mixed to obtain component C; Parts B and C were dripped into component A at a rate of 2 mL / min, cooled to room temperature after the drop was completed, and adjusted to pH 7 with NaOH aqueous solution to obtain a polycarboxylic acid superplasticizer, which was designated as PC-1.

[0039] Depend on figure 1 It can be seen that in the infrared spectrum of the polycarboxylic acid superplasticizer PC-1 obtained in this embodiment, 2093.57cm -1 at -CO-CN 2 The stretching vibration peak at -,...

Embodiment 2

[0042] The preparation method of the polycarboxylate high-efficiency water reducer in this embodiment is as follows:

[0043] Put 108g of TPEG-2400, 10g of PEG-200 and 72g of water into a four-necked flask and mix and stir, then add 0.2g of dibutyltin dilaurate, 1.2g of p-toluenesulfonic acid and 20.4g of hydrogen peroxide to obtain component A; Mix 10.8g acrylic acid, 3.7g sodium bisulfite and 10g water to get component B; mix 0.67g sodium methacrylate, 0.1g ammonium persulfate and 15g water to get component C; The pump first drips component B into component A at a rate of 1mL / min, after component B has been added dropwise for 0.5h, then drips component C into component A at a rate of 1mL / min, and the addition is complete After cooling to normal temperature, adjust the pH value to 7 with NaOH aqueous solution to obtain polycarboxylate superplasticizer, which is denoted as PC-2.

[0044] After testing, the PC-2 obtained in this example conforms to the structural characteristi...

Embodiment 3

[0046] The preparation method of the polycarboxylate high-efficiency water reducer in this embodiment is as follows:

[0047] Put 120g of TPEG-2400, 10g of PEG-200 and 50g of water in a four-necked flask and mix and stir, then add 0.1g of dibutyltin dilaurate and 1.2g of p-toluenesulfonic acid to obtain component A; mix 21.6g of acrylic acid and Mix 10g of water to obtain component B; mix 0.67g of sodium methacrylate, 0.19g of ammonium persulfate and 20g of water to obtain component C; at 45°C, use a peristaltic pump to simultaneously Add dropwise to component A at a rate of 2 mL / min, cool to room temperature after dropwise addition, and adjust the pH value to 7 with NaOH aqueous solution to obtain a polycarboxylate superplasticizer, denoted as PC-3.

[0048] After testing, the PC-3 obtained in this example conforms to the structural characteristics of the general molecular structure formula of the polycarboxylate superplasticizer described in the present invention.

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Abstract

The invention discloses a polycarboxylate high-efficiency water reducer and a preparation method thereof. The preparation method comprises the following steps of at normal temperature, dropwise adding components B, C into a component A, cooling to room temperature after dropwise adding the components, and adjusting the pH value to obtain the polycarboxylate high-efficiency water reducer, wherein the component A is obtained by mixing and stirring polyoxyethylene ether, polyethylene glycol and water and then adding a tin or acid catalyst and hydrogen peroxide; the component B is obtained by mixing acrylic acid, a reducing agent and water; and the component C is obtained by mixing sodium methallyl sulfonate, an initiator and water. The water reducer disclosed by the invention is of a multi-arm branch structure with sufficient arm lengths, so that a steric-hinerance effect can be sufficiently developed, the water reduction performance is high, and the working performance of concrete is improved; and the method disclosed by the invention is mild in reaction condition, simple in technology, few in side reactions, safe, environmentally-friendly, low in energy consumption and low in production cost.

Description

technical field [0001] The invention relates to a water reducer and a preparation method thereof, in particular to a polycarboxylic acid high-efficiency water reducer and a preparation method thereof. Background technique [0002] In the past one or two decades, concrete admixture technology has developed rapidly. The birth of polycarboxylate superplasticizer has made it possible to prepare concrete mixtures with low water-binder ratio and high fluidity. Polycarboxylate superplasticizer is composed of main chain and branch chain. It has the advantages of large degree of freedom in molecular structure, low dosage, high water reducing efficiency, wide cement adaptability, good slump retention, etc., and some functions are also It can be further strengthened by compounding. Therefore, the design and selection of a suitable polycarboxylate superplasticizer can not only effectively reduce the water demand of concrete and obtain the required workability, but also adjust its sett...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F228/02C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/06C08F283/065C08F220/06C08F228/02
Inventor 史才军向顺成
Owner HUNAN UNIV
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