High performance polycarboxylic acid slump retaining agent and preparation method thereof

A technology of polycarboxylic acid and slump retention agent, applied in the field of high-performance polycarboxylic acid slump retention agent and its preparation, can solve the problems of unfavorable environmental protection, energy saving, large resource consumption, etc., and achieve good slump retention ability and high water reduction rate. Effect

Active Publication Date: 2017-07-14
南宁新泰瑞科建材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the current methods for preparing high-performance polycarboxylate-based slump-retaining agents are mostly reactions under high-temperature conditions, which consume a lot of resources and are not conducive to environmental protection and energy saving, there is an urgent need for a normal-temperature preparation method of high-performance polycarboxylate-based slump-retaining agents

Method used

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  • High performance polycarboxylic acid slump retaining agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] Add 300g prenol polyoxyethylene ether and 250g deionized water into a four-necked flask with a capacity of 1L, stir and dissolve, and directly add liquid C to the bottom of the reaction kettle after the dissolution is complete (the liquid C consists of 3.0g ammonium persulfate and 3.0 Concentration is 27.5% hydrogen peroxide), after ten minutes, drip A liquid and B liquid simultaneously (the described A liquid is made up of 25g acrylic acid, 35g hydroxyethyl acrylate and 30g deionized water; Described B liquid is made up of 1.6g vitamin C, 2.8g thioglycolic acid and 80g deionized water). Add liquid A dropwise for 4 hours, and add liquid B dropwise for 4.5 hours. If the system temperature exceeds 45°C during the dropwise addition, you need to turn on the cooling system to keep the temperature in the reactor at 42-45°C. After the dropwise addition, mature for 2 hours, add 169g of deionized water to adjust the obtained product to 40% solid content. That is, the finished p...

Embodiment 2

[0028] Add 300g of prenol polyoxyethylene ether, 5g of acrylic acid and 250g of deionized water into a four-neck flask with a capacity of 1L, stir and dissolve, add 3.5g of ammonium persulfate after the dissolution is complete, and add A liquid and B dropwise at the same time after ten minutes Liquid and C liquid (the A liquid is made up of 20g acrylic acid, 35g hydroxyethyl acrylate and 30g deionized water; The B liquid is made up of 1.6g vitamin C, 2.8g thioglycolic acid and 80g deionized water; C liquid is made up of 3.0g g concentration is 27.5% hydrogen peroxide and 86g deionized water). Add liquid A dropwise for 4 hours, and add liquid B and C dropwise for 4.5 hours. If the system temperature exceeds 45°C during the dropwise addition, you need to turn on the cooling system to keep the temperature in the reactor at 42-45°C. After the dropwise addition, mature for 2 hours, add 76g of deionized water to adjust the obtained product to 40% solid content. That is, the finishe...

Embodiment 3

[0030] Add 300g of prenol polyoxyethylene ether and 250g of deionized water into a four-neck flask with a capacity of 1L, stir to dissolve, add 3.5g of ammonium persulfate after the dissolution is complete, and drop A liquid, B liquid and C at the same time ten minutes later Liquid (the A liquid is made up of 25g acrylic acid, 20g hydroxyethyl acrylate, 15g methyl acrylate and 30g deionized water; the B liquid is made up of 1.6g vitamin C, 2.8g mercaptoacetic acid and 80g deionized water; C liquid Consists of 3.5g of 27.5% hydrogen peroxide and 86g of deionized water). Add liquid A dropwise for 4 hours, and add liquid B and C dropwise for 4.5 hours. If the system temperature exceeds 45°C during the dropwise addition, you need to turn on the cooling system to keep the temperature in the reactor at 42-45°C. After the dropwise addition, mature for 1.5 hours, add 83g of deionized water to adjust the obtained product to 40% solid content. That is to obtain the finished product PC-...

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Abstract

The invention discloses a high performance polycarboxylic acid slump retaining agent and a preparation method thereof. The slump retaining agent comprises, by weight, 300 to 350 parts of macromonomers, 45 to 60 parts of an agent A, 4.0 to 4.5 parts of an agent B, 3.5 to 7.0 parts of an agent C and 500 to 550 parts of deionized water. The macromonomers comprise one or two of isopentenyl alcohol polyoxyethylene ethers. The agent A is a mixture of a small monomer and a sustained-release small monomer. The small monomer is acrylic acid and the sustained-release small monomer comprises one or both of hydroxyethyl acrylate and hydroxypropyl acrylate. A mass ratio of the small monomer to the sustained-release small monomer is 1 to 1.2 to 2.5. The agent B comprises, by weight, 1.2 to 1.8 parts of a reducing agent and 2.2 to 3.5 parts of a chain transfer agent. The agent C is an initiator. The high performance polycarboxylic acid slump retaining agent has a high water reducing capacity and good slump retaining ability, has the air entraining amount lower than that of the commercial product, prevents heating in the whole process, saves energy, is environmentally friendly and has no pollution.

Description

technical field [0001] The invention relates to a high-performance polycarboxylic acid slump-retaining agent and a preparation method thereof. Background technique [0002] With the vigorous development of my country's infrastructure construction, the performance of concrete necessary for infrastructure construction is also constantly improving, and at the same time, the requirements for concrete slump inhibitors are also getting higher and higher. Polycarboxylate-based slump-retaining agent is the third generation of high-performance slump-retaining agent, which has the characteristics of low dosage, high water reducing rate, small slump loss, and good adaptability to cement. Polycarboxylate slump retaining agent can greatly increase the amount of mixed materials such as fly ash and mineral powder. It is green and environmentally friendly, can greatly save cement, and has the advantages of high-strength and ultra-high-strength concrete. It is widely used in commercial concr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/28C08F220/06C08F220/14C08F222/06C08F218/08C08F220/58C04B24/26C04B24/16C04B103/30
CPCC04B24/165C04B24/2694C04B2103/308C08F283/065C08F220/281
Inventor 畅佳超徐元仲程勇维杨惠麟
Owner 南宁新泰瑞科建材股份有限公司
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