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A kind of synthetic method of polycarboxylic acid type high slump water reducing agent

A synthesis method and technology of a water reducing agent are applied in the synthesis field of a polycarboxylic acid type high slump-retaining water reducing agent, which can solve the problems of insufficient stability and uniformity of the polymerization reaction, insufficient initiation of the polymerization reaction, and reduced performance of the finished product of the water reducing agent. Improve pore structure and compactness, control slump loss, and improve fluidity

Active Publication Date: 2022-03-15
GUANGZHOU JIANSHENG BUILDING MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the above-mentioned scheme, the initiation of the polymerization reaction is not enough, it is difficult to artificially control the initiation conditions, the polymerization reaction is not stable enough to be carried out uniformly, and the duration is long, which reduces the synthesis efficiency, and is limited by the polymerization reaction at the same time. The rate is low, the cost increases and the performance of the finished water reducer decreases

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  • A kind of synthetic method of polycarboxylic acid type high slump water reducing agent
  • A kind of synthetic method of polycarboxylic acid type high slump water reducing agent
  • A kind of synthetic method of polycarboxylic acid type high slump water reducing agent

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Embodiment 1

[0049] see figure 1 , a synthetic method of polycarboxylic acid type high slump water reducer, the synthetic method comprises the following steps:

[0050] S1. Prepare treated water: add water treatment agent acrylic acid-maleic anhydride copolymer to tap water until the content of acrylic acid-maleic anhydride copolymer is 3 / L to obtain treated water for later use;

[0051] The molecular weight of the acrylic acid-maleic anhydride copolymer is 2000-5000, and the molar ratio of acrylic acid:maleic anhydride in the acrylic acid-maleic anhydride copolymer is 1.5:1.

[0052] S2. Prepare the macromonomer solution: weigh the macromonomer and the treated water according to the proportion by weight, place them in the reaction kettle to be stirred, dissolve and mix them, stir evenly, and prepare the macromonomer solution, which is set aside;

[0053] The macromonomer is selected from allyl polyoxyethylene ether, methallyl polyoxyethylene ether, butenyl polyoxyethylene ether, methylbu...

Embodiment 2

[0067] see figure 1 , a synthetic method of polycarboxylic acid type high slump water reducer, the preparation method comprises the following steps:

[0068] S1. Preparation of treated water: Add acrylic acid-maleic anhydride copolymer, a water treatment agent, to tap water until the content of acrylic acid-maleic anhydride copolymer is 8 mg / L, to obtain treated water and set aside.

[0069] The molecular weight of the acrylic acid-maleic anhydride copolymer is 2000-5000, and the molar ratio of acrylic acid:maleic anhydride in the acrylic acid-maleic anhydride copolymer is 1.2:1.

[0070] S2. Preparation of a macromonomer solution: weighing the macromonomer and treated water according to the weight ratio, placing them in a reactor to be stirred for dissolving and mixing, and stirring evenly to prepare a macromonomer solution for later use.

[0071] The macromonomer is selected from allyl polyoxyethylene ether, methallyl polyoxyethylene ether, butenyl polyoxyethylene ether, meth...

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Abstract

The invention discloses a method for synthesizing a polycarboxylic acid type high slump water reducer, which belongs to the field of concrete preparation. The monomer solution and alkali solution, under the triggering of the initiator solution, can promote the reverse generation of the polymerization reaction, which can reduce the cost of raw materials and at the same time optimize the synthesis process, change the traditional initiation conditions, and use the redox system to mainly release heat. Promote the polymerization reaction, and add the oxidant and reducing agent through the self-sustaining device, and at the same time have the function of automatically adjusting the redox reaction according to the ambient temperature, significantly improving the stability and adequacy of the polymerization reaction, and then improving the performance of the finished water reducer , can minimize the water-binder ratio of concrete, and at the same time maximize fluidity, with efficient water reduction, improved concrete pore structure and compactness, and better control of concrete slump loss.

Description

technical field [0001] The invention relates to the field of concrete preparation, and more specifically relates to a synthesis method of a polycarboxylic acid type high slump-retaining water-reducing agent. Background technique [0002] In recent years, with the increasing demand for construction concrete, there are high requirements for admixtures that must be added to concrete, especially in recent years. Development in the direction of environmental protection, high water reduction, high slump retention, and better adaptability to concrete floors. Polycarboxylate superplasticizer is widely used because of its low dosage, high water reducing rate, low concrete shrinkage, and environmental protection. It is called the third generation of high-performance superplasticizer. As the country continues to vigorously develop infrastructure and the requirements for concrete are getting higher and higher, the market share of polycarboxylate superplasticizers is increasing. Polycar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C08F283/06C08F265/02C08F220/06C08F222/06C08F218/08C08F220/56C04B103/30
CPCC04B40/0039C08F283/065C08F265/02C08F220/06C08F4/40C04B2103/302C04B2103/308C08F222/06C08F222/02C08F230/02C04B2103/0068C04B24/32C04B24/04C04B2103/22C04B22/062C04B24/2664C04B22/068
Inventor 卢伟雄肖山虎蔡健
Owner GUANGZHOU JIANSHENG BUILDING MATERIALS CO LTD
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