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Prenyl polyether polycarboxylate water reducing agent and synthesis method thereof

A technology of isoprenyl polyether and isoprenyl polyoxyethylene propylene ether, which is applied in the field of isoprenyl polyether polycarboxylate water reducing agent and its synthesis, and can solve the complex synthesis process , high synthesis difficulty, good slump retention performance, etc., to achieve the effect of simple production process, simple synthesis process and good slump retention performance

Active Publication Date: 2011-03-30
SHANXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The esterification water reducer of (meth)acrylic acid has a high water reducing rate and good slump retention, but the polyester macromonomer must first undergo the esterification reaction of a macromolecular alcohol and a small molecule unsaturated acid, and this step is difficult to synthesize Large, the intermediate separation and purification process is relatively complicated, the raw material of the synthesized macromonomer is unstable, and the industrialization cost is high
The synthesis process of polyether polycarboxylate superplasticizer of unsaturated alcohol is simple. The unsaturated polyether macromonomer is mainly carried out through industrial ethoxylation reaction equipment, and only one-step ring-opening polymerization is required without separation. , the product has high purity, and the follow-up polymerization process is simple. The products currently on the market are mainly allyl polyoxyethylene ethers. This type of polyether has low activity and can only be better copolymerized with maleic anhydride. The synthesized product The water-reducing rate is low, the slump-retaining performance is general, and due to the dicarboxylic groups of maleic anhydride, this type of polycarboxylate superplasticizer has a greater impact on the hydration of cement; the currently reported product is methallyl poly Oxyethylene ether, this type of polyether has high activity and can be well copolymerized with small acrylic monomers. The synthesized water reducing agent has a high water reducing rate, good slump retention performance, and good adaptability to various cements
However, the initiator used in its synthesis is methallyl alcohol. The synthesis process is complicated and the price is relatively high. It belongs to fine chemicals, which limits its large-scale promotion and use.

Method used

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  • Prenyl polyether polycarboxylate water reducing agent and synthesis method thereof
  • Prenyl polyether polycarboxylate water reducing agent and synthesis method thereof
  • Prenyl polyether polycarboxylate water reducing agent and synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Add 150g of IB-500 and 120g of deionized water into a 1000ml four-neck flask equipped with mechanical stirring, temperature controller, and dripping device, and heat up while stirring and dissolving. When the temperature rises to 50°C, add 1.1g of 30% Hydrogen peroxide, when the temperature reaches 60°C, start to drop acrylic acid solution (22g acrylic acid dissolved in 10g deionized water) and a mixed solution of vitamin C and thioglycolic acid (0.5g vitamin C, 0.3g thioglycolic acid dissolved in 60g deionized water) ), the dropping time of the acrylic acid solution was controlled at 2.5 hours, the dropping time of the vitamin C solution was controlled at 3 hours, and the reaction temperature was controlled at 60±2°C. After the dropwise addition, continue to insulate for 0.5 hours, then cool to below 40°C, add aqueous sodium hydroxide solution (6.9g sodium hydroxide is dissolved in 71.1g deionized water) to neutralize, and obtain a concentration of 40%, pH=7.5 Pale yel...

Embodiment 2

[0037] Add 155g of IB-1000 and 120g of deionized water into a 1000ml four-necked flask equipped with mechanical stirring, temperature controller and dripping device, and heat up while stirring and dissolving. When the temperature rises to 50°C, add 1.0g of 30% Hydrogen peroxide, when the temperature reaches 60°C, start to drop acrylic acid solution (16g acrylic acid dissolved in 10g deionized water) and a mixed solution of sodium sulfite and thioglycolic acid (0.4g sodium sulfite, 0.2g mercaptopropionic acid dissolved in 60g deionized water) , the dropping time of the acrylic acid solution was controlled at 2.5 hours, the dropping time of the vitamin C solution was controlled at 3 hours, and the reaction temperature was controlled at 60±2°C. After the dropwise addition, continue to insulate for 0.5 hours, then cool to below 40°C, add aqueous sodium hydroxide solution (5.0g sodium hydroxide is dissolved in 68.6g deionized water) to neutralize, and obtain a concentration of 40%, ...

Embodiment 3

[0039] Add 156g of IB-1500 and 120g of deionized water into a 1000ml four-necked flask equipped with mechanical stirring, temperature controller, and dripping device, and heat up while stirring and dissolving. When the temperature rises to 50°C, add 1.1g of 30% Hydrogen peroxide, when the temperature reaches 60°C, start to drop methacrylic acid solution (17g methacrylic acid dissolved in 10g deionized water) and a mixed solution of vitamin C and thioglycolic acid (0.52g vitamin C, 0.26g thioglycolic acid dissolved in 60g deionized water), the dropping time of the acrylic acid solution was controlled at 2.5 hours, the dropping time of the vitamin C solution was controlled at 3 hours, and the reaction temperature was controlled at 60±2°C. After the dropwise addition, continue to insulate for 0.5 hours, then cool to below 40°C, add aqueous sodium hydroxide solution (5.3g sodium hydroxide is dissolved in 71.9g deionized water) to neutralize, and obtain a concentration of 40%, pH=7....

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Abstract

The invention provides a prenyl polyether polycarboxylate water reducing agent which is a polymer of prenyl polyoxyethylene ether or prenyl polyoxyethylene propylene ether (big monomer A) and unsaturated carboxylic acid and derivatives thereof (small monomer B), belonging to the field of concrete additives. A synthesis method of the water reducing agent comprises the following steps of: with water as a solvent, initiating the big monomer A and the small monomer B by adopting a redox initiation system under the lower temperature, and carrying out copolymerization under the action of a chain transfer agent to obtain the finished product. The water reducing agent overcomes the defects of low water reducing rate, poor slump loss resistance, long condensation time, and the like of a water reducing agent synthesized by allyl polyoxyethylene ether and has the advantages of high slump loss resistance, plenty water reducing and small influence on the condensation time of concrete.

Description

technical field [0001] The invention relates to a concrete water reducer, in particular to an isoprenyl polyether polycarboxylate water reducer and a synthesis method thereof. Background technique [0002] The water reducing agent is used in concrete, which can reduce the water required for cement hardening, has a strong dispersion effect on cement, makes the physical structure of concrete more uniform after solidification, and improves the strength of concrete. The development of water reducers mainly has three stages: the first generation is an ordinary water reducer represented by lignosulfonate; the second generation is a high-efficiency water reducer represented by naphthalene sulfonate; the third generation is a High-performance water reducer represented by polycarboxylate. [0003] The polycarboxylate superplasticizer with polyether side chain is the latest research achievement at present, it has high dispersion performance and good slump retention performance at low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C08F290/06C04B103/30
CPCC04B24/32
Inventor 王自为裴继凯李军平王正波
Owner SHANXI UNIV
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