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Preparation and application of hyperbranched retarder

A technology of retarder and hyperbranched polymer, which is applied in the field of retarder, can solve the problems of short retarding time and poor fluidity of concrete, and achieve the effect of improving water reducing efficiency, improving retarding performance and reducing the amount of addition

Inactive Publication Date: 2019-01-25
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of short retarding time and poor fluidity of concrete, the invention provides a preparation method of a hyperbranched retarder for improving the fluidity of concrete and adjusting its setting time

Method used

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  • Preparation and application of hyperbranched retarder
  • Preparation and application of hyperbranched retarder
  • Preparation and application of hyperbranched retarder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0042] (1) Using esterification reaction, under the action of catalyst p-toluenesulfonic acid, benzene is used as solution, toluene is used as water-carrying agent, itaconic acid is used as nucleus molecule, malic acid is used as monomer, and condensation reaction is carried out at 80°C , react for 12-48h, control the algebra of hyperbranching by repeatedly adding monomers, and synthesize the first and second generation hyperbranched polymers. Take a certain amount of hyperbranched polymer and diethanolamine, mix them into a three-necked bottle, add a certain amount of initiator to capping, stir and cool down to 65°C, stir and react for 8 hours, then take a certain amount of hyperbranched polymer and acrylamide , sodium methacrylic sulfonate, mix them into a three-necked bottle, add a certain amount of initiator to polymerize, and finally adjust the pH=7 to 7.5 with 40% sodium hydroxide solution, and then distill under reduced pressure to obtain hyperbranched coagulant finishe...

Embodiment approach 2

[0046] (1) Using esterification reaction, under the action of catalyst p-toluenesulfonic acid, benzene is used as solution, toluene is used as water-carrying agent, itaconic acid is used as nucleus molecule, malic acid is used as monomer, and condensation reaction is carried out at 80°C , react for 12-48h, control the algebra of hyperbranching by repeatedly adding monomers, and synthesize the first and second generation hyperbranched polymers. Take a certain amount of hyperbranched polymer and diethanolamine, mix them into a three-necked bottle, add a certain amount of initiator to capping, stir and cool down to 65°C, stir and react for 8 hours, then take a certain amount of hyperbranched polymer and acrylamide , sodium methacrylic sulfonate, mix them into a three-necked bottle, add a certain amount of initiator to polymerize, and finally adjust the pH=7 to 7.5 with 40% sodium hydroxide solution, and then distill under reduced pressure to obtain hyperbranched coagulant finishe...

Embodiment approach 3

[0050] (1) Using esterification reaction, under the action of catalyst p-toluenesulfonic acid, benzene is used as solution, toluene is used as water-carrying agent, itaconic acid is used as nucleus molecule, malic acid is used as monomer, and condensation reaction is carried out at 80°C , react for 12-48h, control the algebra of hyperbranching by repeatedly adding monomers, and synthesize the first and second generation hyperbranched polymers. Take a certain amount of hyperbranched polymer and diethanolamine, mix them into a three-necked bottle, add a certain amount of initiator to capping, stir and cool down to 65°C, stir and react for 8 hours, then take a certain amount of hyperbranched polymer and acrylamide , sodium methacrylic sulfonate, mix them into a three-necked bottle, add a certain amount of initiator to polymerize, and finally adjust the pH=7 to 7.5 with 40% sodium hydroxide solution, and then distill under reduced pressure to obtain hyperbranched coagulant finishe...

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Abstract

The invention relates to the technical field of concrete additives, and more specifically relates to application of a hydroxyl terminated hyperbranched polyester hyperbranched retarder in adjustment of retardation time of concrete. A new hyperbranched retarder is synthesized by synthesizing a carboxyl terminated hyperbranched polymer first, then performing end capping on the carboxyl terminated hyperbranched polymer, and synthesizing the hydroxyl terminated polymer into a main chain. When used in the field of concrete additives, the hyperbranched retarder can well improve the mobility of concrete and prolong the retardation time, and the hyperbranched retarder has a simple and convenient synthesis process, is easy to industrialize and has superior performance.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a retarding method for reducing the hydration speed and heat of hydration of concrete so that fresh concrete can maintain plasticity for a long time, thereby adjusting the setting time of fresh concrete agent. It also relates to its preparation method. Background technique [0002] With the rapid development of industry, concrete has also developed rapidly, and some corresponding concrete admixtures have also begun to develop rapidly. For example, in order to prolong the setting time of cement, retarders have been found. [0003] Concrete super retarder is an admixture that can adjust the setting time of concrete arbitrarily for a long time without affecting the strength of concrete in the later stage. This admixture is mainly used in concrete projects that are constructed under long-term dry and high-temperature environments, and other projects that require concre...

Claims

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Application Information

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IPC IPC(8): C08F283/01C08F220/56C08F228/02C08G63/52C08G63/78C04B24/16C04B103/22
CPCC04B24/163C04B2103/22C08F283/01C08G63/52C08G63/78C08F220/56C08F228/02
Inventor 寿崇琦郭鹏飞
Owner UNIV OF JINAN
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