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Chain transfer agent for polycarboxylate superplasticizer as well as application and preparation method thereof

A technology of chain transfer agent and water reducing agent, which is applied in the field of chain transfer agent for polycarboxylate water reducing agent and its application and preparation, can solve the problem that it is easy to explode in the presence of oxidants, the base type chain transfer agent is easy to volatilize, and the chain transfer catalytic efficiency Low problems, to achieve the effect of improving flow performance, promoting healthy development, and reducing volatility

Pending Publication Date: 2022-02-08
GUIZHOU KEZHIJIE NEW MATERIAL
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the series of problems existing in the existing chain transfer agent in the synthesis process of the polycarboxylate superplasticizer mentioned in the background technology: the mercapto chain transfer agent is volatile, the chain transfer catalytic efficiency is low, the hypophosphite chain transfer agent is easy to deliquescence, In case of problems such as the explosiveness of oxidants, the present invention provides a chain transfer agent for polycarboxylate superplasticizers, the general structural formula of which is:

Method used

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  • Chain transfer agent for polycarboxylate superplasticizer as well as application and preparation method thereof
  • Chain transfer agent for polycarboxylate superplasticizer as well as application and preparation method thereof
  • Chain transfer agent for polycarboxylate superplasticizer as well as application and preparation method thereof

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preparation example Construction

[0035] The invention provides a kind of preparation method of chain transfer agent for polycarboxylate superplasticizer, it comprises the following steps:

[0036] (1) by certain weight portion, take aminobenzene sulfonate, catalyst and functional mercapto group substance;

[0037] (2) Put the aminobenzenesulfonate and the catalyst into the reaction kettle and stir for 5 minutes to 15 minutes to mix the raw materials evenly, and fill the reaction kettle with inert gas until the amidation reaction is completed;

[0038] (3) Raise the reaction temperature in the reactor to 60°C to 75°C, and add functional mercapto substances;

[0039] (4) After the addition of functional mercapto substances, the reaction temperature is raised to 85° C. to 105° C., and the amidation reaction is carried out at a constant temperature for 1 h to 3 h to prepare the chain transfer agent for the polycarboxylate water reducer.

[0040] Among them, setting the constant temperature reaction temperature a...

Embodiment 1

[0045] In parts by weight, 5 parts by weight of sodium 4-aminobenzenesulfonate and 0.01 parts by weight of zinc oxide were dropped into the reactor and stirred for 5 min, and fed into N 2Fill the entire reactor until the reaction is over. After the system in the reactor is heated to 60°C, start to add 10 parts by weight of thioglycolic acid dropwise. After dropping for 1 hour, raise the temperature to 85°C and react at constant temperature for 1 hour to obtain a polycarboxylate superplasticizer. Use a chain transfer agent.

Embodiment 2

[0047] (1) Prepare chain transfer agent for polycarboxylate water reducer:

[0048] In parts by weight, 8 parts by weight of potassium 4-aminobenzenesulfonate and 0.04 parts by weight of zinc chloride were dropped into the reactor and stirred for 8min, and fed into N 2 Fill the entire reactor until the reaction is completed, the temperature of the reactor system is raised to 65°C, and 13 parts by weight of 2-mercaptoethanesulfonic acid are added dropwise. After adding dropwise for 1 hour, the temperature is raised to 95°C and reacted at constant temperature for 2 hours to obtain polycarboxylate Chain transfer agent for acid water reducer.

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Abstract

The invention relates to the technical field of concrete admixtures, in particular to a chain transfer agent for a polycarboxylate superplasticizer as well as application and a preparation method thereof. The chain transfer agent for the polycarboxylate superplasticizer is prepared by carrying out amidation reaction on amino benzene sulfonate and a functional sulfydryl substance under the catalysis of a catalyst. The structure of the chain transfer agent for the polycarboxylate superplasticizer contains sulfydryl and benzene sulfonic acid groups, the water solubility of the chain transfer agent and the chain transfer catalytic performance of the chain transfer agent in a polymerization reaction can be improved, the molecular weight of the polycarboxylate superplasticizer can be better adjusted when the chain transfer agent is used in synthesis of the polycarboxylate superplasticizer, the molecular weight distribution of the synthesized polycarboxylate superplasticizer is narrow, and after the polycarboxylate superplasticizer acts on concrete, the flowing property, slump retaining property and compressive strength of the concrete can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a chain transfer agent for polycarboxylate water reducer and its application and preparation method. Background technique [0002] Polycarboxylate superplasticizers continue to develop and evolve, starting from aliphatic superplasticizers, sulfamate superplasticizers, naphthalene-based superplasticizers and the third generation of polycarboxylate superplasticizers. The polycarboxylate superplasticizers produced in the market today can be divided into water-reducing type, slump-preserving type, super-slow-release type, early-strength type, viscosity-reducing type, etc. due to its mature production technology and relatively simple production process. Economical and applicable, the molecular structure is diversified and controllable, and the concrete has the advantages of high water-reducing rate in the case of low dosage, and has become one of the indispensable admixtur...

Claims

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Application Information

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IPC IPC(8): C07C323/52C07C319/12C08F2/38C08F283/06C08F220/06
CPCC07C323/67C07C319/12C04B24/20C04B2103/302
Inventor 陈文红邓磊蒋禹吕昌伟罗小峰
Owner GUIZHOU KEZHIJIE NEW MATERIAL
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