Polyphosphoric acid water reducing agent and preparation method thereof

A technology of water reducing agent and polyphosphoric acid, which is applied in the field of concrete admixtures, can solve the problems of insufficient water reducing and slump retention capabilities, large differences in material performance, and difficulty in adapting, so as to save transportation costs, strengthen tolerance, improve The effect of adsorption capacity

Active Publication Date: 2020-06-19
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to overcome the deficiencies of polycarboxylate superplasticizers in practical engineering applications, such as insufficient water reduction and slump retention capabilities, large differences in material performance in different regions, and difficulty in adapting to the defects of today's high sulfate and high clay aggregates. Design and development A kind of preparation method of novel polyphosphoric acid superplasticizer

Method used

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  • Polyphosphoric acid water reducing agent and preparation method thereof
  • Polyphosphoric acid water reducing agent and preparation method thereof
  • Polyphosphoric acid water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Synthesis of phosphoric acid polyether:

[0040] Add 500g of MPEG500 (numbers indicate molecular weight, the same below) and 205.8g of phosphoric acid into the reaction flask equipped with a thermometer and agitator, raise the temperature to 80°C, and react for 6 hours to obtain polyether phosphate;

[0041] (2) Preparation of polyphosphoric acid superplasticizer:

[0042] Add 300g PEG200, 12.4g ethylene glycol, 115.3g phosphoric acid and 1110g cyclohexane to the phosphoric acid polyether prepared above, and reflux at 90°C for 12 hours. 35wt% NaOH solution and 1430g water were neutralized and diluted to obtain the finished polyphosphoric acid superplasticizer with a solid content of 40.2%, a pH of 7.2, a weight average molecular weight of 11400, and a molecular weight distribution of 2.09.

Embodiment 2

[0044] (1) Synthesis of phosphoric acid polyether:

[0045] Add 600g of MPEG750 and 141.9g of polyphosphoric acid into a reaction flask equipped with a thermometer and a stirrer, raise the temperature to 100°C, and react for 6 hours to obtain polyether phosphate;

[0046] (2) Preparation of polyphosphoric acid superplasticizer:

[0047] Add 240g PEG200, 24.3g 1,3-propylene glycol, 110.7g phosphoric acid and 1124g cyclohexane to the phosphoric acid polyether prepared above, and reflux at 90°C for 12 hours. Add 205g of 35wt% NaOH solution and 1590g of water for neutralization and dilution to obtain the finished polyphosphoric acid superplasticizer with a solid content of 40.4%, a pH of 6.8, a weight average molecular weight of 17600, and a molecular weight distribution of 2.17.

Embodiment 3

[0049] (1) Synthesis of phosphoric acid polyether:

[0050] Add 500g of MPEG1000 and 93.4g of pyrophosphoric acid into a reaction flask equipped with a thermometer and a stirrer, raise the temperature to 120°C, and react for 10 hours to obtain polyether phosphate;

[0051] (2) Preparation of polyphosphoric acid superplasticizer:

[0052] Add 180g PEG200, 18g 1,4-butanediol, 86.5g phosphoric acid and 865g cyclohexane to the phosphoric acid polyether prepared above, and reflux at 100°C for 12 hours. , adding 145g of 35wt% NaOH solution and 1244g of water for neutralization and dilution, the finished product of polyphosphoric acid superplasticizer can be obtained, the solid content is 40.1%, the pH is 6.5, the weight average molecular weight is 20600, and the molecular weight distribution is 1.96.

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Abstract

The invention discloses a polyphosphoric acid water reducing agent and a preparation method thereof. The polyphosphoric acid water reducing agent is prepared by carrying out an esterification dehydration reaction on phosphoric acid polyether, polyethylene glycol, alkyl diol, a phosphoric acid compound B and a water carrying agent, wherein the phosphoric acid polyether is prepared by carrying out an esterification reaction on polyethylene glycol monomethyl ether and a phosphoric acid compound A according to a molar ratio of 1:(1.05-1.2), and the molar ratio of the phosphoric acid polyether to the polyethylene glycol to the alkyl diol to the phosphoric acid compound B is 1:(1.5-3):(0.2-2):(1-4). According to the invention, the production process of the water reducing agent is simple, raw materials are cheap and easy to obtain, equipment investment is low, industrial large-scale production is easy, pollution in the reaction process is small, the water carrying agent can be recycled, and alarge amount of transportation cost is saved; and the water reducing agent has strong water reducing and slump retaining capabilities, can improve the workability of concrete, has good adaptability to concrete materials in different regions, has strong tolerance to sandstone aggregate with high clay and high sulfate content, and has a wide market application prospect.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a polyphosphoric acid water reducer and a preparation method thereof. Background technique [0002] Concrete admixture refers to the substance added to improve and adjust the performance of concrete. It can regulate the rheological properties of concrete, improve mechanical properties and durability, and provide a strong guarantee for the quality of large-scale projects. Therefore, its wide application is It is regarded as the third major breakthrough in concrete technology after reinforced concrete and prestressed concrete. Water reducer (also called "cement dispersant") is the most widely researched and used concrete admixture at present. In the case of the same workability of concrete, adding water reducer can effectively save the amount of cement , Reduce water consumption, improve concrete performance and strength. Generally speaking, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C08G79/04C08G65/327C04B103/30
CPCC04B24/243C08G79/04C08G65/327C04B2103/302
Inventor 冉千平李申桐杨勇周栋梁严涵黄振舒鑫张建纲
Owner JIANGSU SOBUTE NEW MATERIALS
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