Preparation method of polycarboxylate superplasticizer macromonomer

A technology of water reducer and macromonomer, which is applied in the field of preparation of polycarboxylate water reducer macromonomer, can solve the problems of low flash point, easy combustion, long reaction time between catalyst and initiator, etc., and achieve saving Effects of saving energy, saving production time, and reducing production costs

Pending Publication Date: 2021-01-05
于广臣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the catalysts used in the production of polyether macromonomers are metal sodium, potassium hydroxide, sodium hydride or sodium methoxide. When metal sodium, potassium hydroxide or sodium hydride is used as the catalyst, the reaction time between the catalyst and the initiator is long , and some initiators are alcohols with low flash points, which are prone to combustion when reacting with metallic sodium, potassium hydroxide or sodium hydride

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation of embodiment 1 isopentenyl polyoxyethylene ether (2400)

[0026] (1) Preparation of catalyst: Add 1500kg of prenyl alcohol into the reactor and start stirring, open the vacuum system of the reactor, wait until the negative pressure of the reactor is less than 0.08MPa, suck 100kg of sodium methoxide through the negative pressure in the reactor In the reaction kettle, replace the reaction kettle with nitrogen. After filling the reactor with nitrogen to normal pressure, the reaction kettle is heated and stirred continuously. The stirring speed is 150-350r / min. distilled. Distillation is carried out through the rectification tower combined with the reactor, the vacuum system of the reactor is turned on, the pressure inside the reactor is maintained at -0.05~-0.08MPa, the temperature of the reactor is maintained at 80~110°C, the methanol in the gas phase of the reactor Cooled by the condenser behind the rectification tower, the cooler uses chilled water to ...

Embodiment 2

[0032] The preparation of embodiment 2 methallyl polyvinyl ether (2400)

[0033](1) Preparation of the catalyst: 1500kg of 2-methallyl alcohol is added to the reactor and the stirring is started, the vacuum system of the reactor is opened, until the negative pressure of the reactor is less than 0.08MPa, the negative pressure in the reactor will Inhale 100kg of sodium methoxide into the reactor, replace the reactor with nitrogen, fill the reactor with nitrogen to normal pressure, heat the reactor and continue to stir, and react for 10-20min under the condition of stirring speed of 150-350r / min, and then clean the reactor. The resulting methanol is distilled. Distillation is carried out through the rectification tower combined with the reactor, the vacuum system of the reactor is turned on, the pressure inside the reactor is maintained at -0.05~-0.08MPa, the temperature of the reactor is maintained at 80~110°C, the methanol in the gas phase of the reactor Cooled by the condense...

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PUM

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Abstract

The invention discloses a preparation method of a polycarboxylate superplasticizer macromonomer. Unsaturated sodium alcoholate produced by sodium methoxide and raw material alcohol is adopted as a catalyst so that the interference of byproduct methanol in the production process of the polycarboxylate superplasticizer macromonomer is avoided, no violent reaction is generated when catalysts such aspotassium hydroxide, sodium hydroxide, metal sodium, potassium and sodium hydride are used; the method is simple in process, the catalyst prepared by the method can be added into a reaction system ata time when the polycarboxylate superplasticizer macromonomer is produced, no catalyst needs to be added when a crude product of the polycarboxylate superplasticizer macromonomer is prepared, and theproduction time is saved, the energy is saved and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer, in particular to a preparation method of a polycarboxylate water reducer macromonomer. Background technique [0002] Since the 1990s, polycarboxylate superplasticizer has developed into a new type of high-efficiency superplasticizer, which has high strength and heat resistance. Good durability and other excellent properties, low slump loss at high temperature, good fluidity, high strength of formed concrete can be guaranteed without greatly increasing the amount of water reducing agent at low temperature, and is widely used It is used in the construction of various large bridges and roads. There are many ways to synthesize polycarboxylate superplasticizers, the most commonly used is to use polymerizable monomers to directly polymerize polycarboxylate superplasticizers. At present, polyether macromonomer has become the mainstream of research and application of polycarboxyla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28
CPCC08G65/2609C08G65/2648
Inventor 于广臣王刚彭义秋
Owner 于广臣
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