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Preparation and application of hydroxyl-terminated hyperbranched polyamide retarder

A technology of hydroxyl-terminated hyperbranched and hyperbranched polymers is applied in the field of retarders, which can solve the problems of poor fluidity and short retardation time of concrete, and achieve the improvement of retardation performance, water reduction efficiency and compatibility. Effect

Inactive Publication Date: 2019-06-04
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 concrete retardation time and poor fluidity, the invention provides a preparation method of a hydroxyl-terminated hyperbranched polyamide retarder for improving the fluidity of concrete and adjusting its setting time

Method used

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  • Preparation and application of hydroxyl-terminated hyperbranched polyamide retarder
  • Preparation and application of hydroxyl-terminated hyperbranched polyamide retarder
  • Preparation and application of hydroxyl-terminated hyperbranched polyamide retarder

Examples

Experimental program
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Effect test

Embodiment approach 1

[0035] (1) Utilize the amidation reaction, under the action of the catalyst p-toluenesulfonic acid, take DMAc as the solution and toluene as the water-carrying agent, weigh 25g of methallyl polyoxyethylene ether, 10.5g of trimesic acid, 5.25 Add 1 g of diethanolamine into a three-necked flask with mixing and stirring, carry out condensation reaction at 50°C, react for 12-48 hours, 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 acrylamide, mix them into a three-necked flask, add a certain amount of initiator to carry out addition polymerization, stir and heat up to 65°C, stir for 8 hours, and finally adjust the pH with 40% sodium hydroxide solution =7~7.5, and then distilled under reduced pressure to obtain the finished product of hyperbranched coagulant.

[0036] (2) The coagulation time is measured by a penetration resistance meter wi...

Embodiment approach 2

[0039] (1) Utilize amidation reaction, under the action of catalyst p-toluenesulfonic acid, take DMAc as solution and toluene as water-carrying agent, weigh 25g methallyl polyoxyethylene ether, 21g trimesic acid, 10.5g Diethanolamine is mixed and stirred into a three-necked flask, and the condensation reaction is carried out at 50°C for 12 to 48 hours. By repeatedly adding monomers, the algebra of hyperbranching is controlled, and the first and second generation hyperbranched polymers are synthesized. Take a certain amount of hyperbranched polymer, sodium methacryl sulfonate, and acrylamide, mix them into a three-necked flask, add a certain amount of initiator for addition polymerization, stir and heat up to 65°C, stir for 8 hours, and finally use 40% The sodium hydroxide solution is used to adjust the pH=7 to 7.5, and then distilled under reduced pressure to obtain the finished product of the hyperbranched coagulant.

[0040] (2) The coagulation time is measured by a penetrat...

Embodiment approach 3

[0043](1) Utilize amidation reaction, under the action of catalyst p-toluenesulfonic acid, take DMAc as solution and toluene as water-carrying agent, weigh 20g methallyl polyoxyethylene ether, 21g trimesic acid, 10.5g Diethanolamine is mixed and stirred into a three-necked flask, and the condensation reaction is carried out at 50°C for 12 to 48 hours. By repeatedly adding monomers, the algebra of hyperbranching is controlled, and the first and second generation hyperbranched polymers are synthesized. Take a certain amount of hyperbranched polymer, sodium methacryl sulfonate, and acrylamide, mix them into a three-necked flask, add a certain amount of initiator for addition polymerization, stir and heat up to 65°C, stir for 8 hours, and finally use 40% The sodium hydroxide solution is used to adjust the pH=7 to 7.5, and then distilled under reduced pressure to obtain the finished product of the hyperbranched coagulant.

[0044] (2) The coagulation time is measured by a penetrati...

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Abstract

The invention relates to the technical field of concrete admixtures, more specifically, the invention relates to application of a hydroxyl-terminated hyperbranched polyamide retarder in adjusting theretarding time of concrete. Firstly, a hydroxyl-terminated hyperbranched polymer is synthesized, and then the hydroxyl-terminated hyperbranched polymer is subjected to addition polymerization, so thata novel hydroxyl-terminated hyperbranched polyamide retarder is synthesized. The hydroxyl-terminated hyperbranched polyamide retarder is applied to the field of concrete additives, so that the flowing property of concrete can be well improved, the retarding time is prolonged, the synthesis process is simple and convenient, the industrialization is easy, and the retarder is excellent in 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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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C04B24/28C04B103/22
Inventor 寿崇琦郭鹏飞
Owner UNIV OF JINAN
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