Concrete air entraining agent and preparation method thereof

An air-entraining agent and concrete technology, applied in the field of building materials, can solve the problems of unreasonable bubble structure, inability to effectively improve the workability of fresh concrete, unstable bubbles, etc., and achieve the effect of improving workability and hardening durability.

Inactive Publication Date: 2011-01-19
FUJIAN KZJ NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, most of the existing air-entraining agents have deficiencies such as unreasonable bubble structure, uneven distribution, unstable b

Method used

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  • Concrete air entraining agent and preparation method thereof
  • Concrete air entraining agent and preparation method thereof
  • Concrete air entraining agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In terms of parts by mass, 100.0g limonene, 10.0g oleic acid, 5.0g 2-methylene succinic anhydride, and 2.5g tert-butyl hydroperoxide were put into the reactor, and nitrogen was charged at the same time, and the temperature was controlled at 105°C. Carry out radical thermal polymerization and esterification under stirring for 5 hours; add 185.0g of water and heat until the solution boils; slowly add 6.5g of calcium hydroxide and carry out saponification for 3 hours; after the reaction is completed, cool to room temperature to obtain entrained gas The finished product has a weight concentration of 39.5%.

Embodiment 2

[0023] In parts by mass, 80.0g terpinolene, 12.0g oleic acid, 5.0g dodecenylsuccinic anhydride, 1.0g cumene hydroperoxide were dropped into the reactor, and nitrogen was charged at the same time, and the temperature was controlled at 100 ℃, carry out free radical thermal polymerization and esterification under stirring for 5 hours; add 180.0g of water, and heat until the solution boils; slowly add 15.0g of potassium hydroxide, and carry out saponification reaction for 1 hour; after the reaction is completed, cool to room temperature to obtain The finished air-entraining agent has a weight concentration of 38.5%.

Embodiment 3

[0025] In terms of parts by mass, 70.0g phellandrene, 16.0g linoleic acid, 6.0g itaconic anhydride, 3.0g tert-butyl hydroperoxide were put into the reaction kettle, filled with nitrogen at the same time, the temperature was controlled at 115°C, and stirred Carry out free radical thermal polymerization and esterification for 4 hours; add 170.0g of water, and heat until the solution boils; slowly add 12.5g of sodium hydroxide, and carry out saponification for 2 hours; after the reaction, cool to room temperature to obtain the finished air-entraining agent , The weight concentration is 38.7%.

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Abstract

The invention discloses a concrete air entraining agent and a preparation method thereof. The preparation method is as follows: proportionally adding unsaturated terpene, unsaturated fatty acid, unsaturated anhydride and initiator into a reaction kettle in parts by weight, carrying out free radical thermal polymerization and esterification reaction under a certain condition, and then carrying out saponification with alkali in water solution to obtain high polymer with certain molecular weight, wherein the molecular structure has hydrophilic carboxyl and ester group, hydrophobic long carbon aliphatic chains and cyclic carbon chain structures with certain spatially domino effect. The air-entraining agent has good composite performance with other additives, the entrained bubbles are even and small and have high durability, and for concrete projects, such as highways, railways, bridges, tunnels, water projects and the like having high requirements on durability, the air-entraining agent can improve the workability and hardened durability of concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a concrete air-entraining agent and a preparation method thereof. Background technique [0002] Air-entraining agents can effectively improve the workability of concrete, and at the same time play an irreplaceable role in improving the durability of concrete, and are suitable for important concrete projects. The air-entraining agent needs to have good water-reducing performance, so that it can replace the water-reducing function of high-efficiency water-reducing agent in concrete, and can save cement consumption while maintaining the workability and water-cement ratio of concrete. , Effectively reduce the use cost of concrete. [0003] The use of a certain amount of air-entraining agent in concrete engineering can improve the fluidity, workability, and pumpability of fresh concrete, increase the cohesion of fresh concrete, increase the vibration viscosity coefficient,...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F232/00C04B103/30
CPCC04B2111/00086C04B2111/74C04B2111/00724C04B24/2688C04B2103/304C04B2111/0075
Inventor 方云辉林添兴尹键丽郭鑫祺蒋卓君温庆如于飞宇林庆昌林祥毅潘志峰麻秀星
Owner FUJIAN KZJ NEW MATERIALS CO LTD
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