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Synthesis process for one-step production of polycarboxylic acid water reducing agent monomer polyether

A synthesis process, monomer polyether technology, applied in the field of one-step production of polycarboxylate water reducer monomer polyether synthesis process, can solve the problems of low production efficiency, high monomer residue, unstable product quality, etc. , to achieve the effect of improved control, stable quality and low operation difficulty

Active Publication Date: 2019-02-26
佳化化学泉州有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the need to first synthesize the prepolymer and then gradually synthesize the macromonomer polyether in the prior art, and the production efficiency is low, the product quality is unstable, the monomer residual amount is high, and continuous production cannot be achieved. production problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of methacrylic alcohol polyoxyethylene ether

[0037] ①Add 1350kg of methacrylic alcohol and 20kg of metallic sodium to the reactor A, and use high-purity N 2 Replace the air in the reactor A; continue to pass N 2 The autoclave pressure was set to 0.3 MPa, and the autoclave temperature was heated to 80° C. to obtain the first material.

[0038] ②Continue to maintain an oxygen-free environment, inject the first material and ethylene oxide into the reactor B at the same time, and mix them during the injection process, wherein the introduction rate of the first material is 50kg / h, and the first material and ethylene oxide are The molar ratio of the feed rate of alkane is 1:53, a total of 43650kg of ethylene oxide is fed, and the temperature of the kettle is adjusted to be 100-120°C, and the pressure of the kettle is 0

[0039] ③ Introduce the second material into the reactor C for depressurization...

Embodiment 2

[0043] Preparation of Prenol Polyoxyethylene Ether

[0044] ①Add 1600kg of prenyl alcohol and 20kg of metallic sodium to the reactor A, and use high-purity N 2 Replace the air in the reactor A; continue to pass N 2 The autoclave pressure was set to 0.3 MPa, and the autoclave temperature was heated to 80° C. to obtain the first material.

[0045] ②Continue to maintain an oxygen-free environment, inject the first material and ethylene oxide into the reactor B at the same time, and mix them during the injection process, wherein the introduction rate of the first material is 80kg / h, and the first material and ethylene oxide are The molar ratio of the feeding rate of alkane is 1:52.5, a total of 43000kg of ethylene oxide is fed, the temperature of the kettle is adjusted to be 105~110°C, the pressure of the kettle is 0

[0046] ③ Introduce the second material into the reactor C for depressurization and ripening, contro...

Embodiment 3

[0050] Preparation of Prenol Polyoxyethylene Ether

[0051] ①Add 3870kg of prenyl alcohol and 20kg of metallic sodium to the reactor A, and use high-purity N 2 Replace the air in the reactor A; continue to pass N 2 The autoclave pressure was set to 0.3 MPa, and the autoclave temperature was heated to 80° C. to obtain the first material.

[0052] ②Continue to maintain an oxygen-free environment, inject the first material and ethylene oxide into the reactor B at the same time, and mix them during the injection process, wherein the introduction rate of the first material is 150kg / h, and the first material and ethylene oxide The molar ratio of the feed rate of alkane is 1:21, a total of 41130kg of ethylene oxide is fed, the temperature of the kettle is adjusted to be 105~110°C, the pressure of the kettle is 0

[0053] ③ Introduce the second material into the reactor C for depressurization and ripening, control the te...

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Abstract

The invention provides a synthesis process for one-step production of polycarboxylic acid water reducing agent monomer polyether. An initiator and a catalyst are mixed at temperature and pressure, andthen the mixture and epoxide are introduced into a reaction kettle in a certain proportion at the same time and are subjected to opening-ring polymerization, and the monomer polyether is synthesizedby a one-step method. The synthesis process realizes continuous production without synthesis of a prepolymer firstly and then step-by-step synthesis of macromolecular monomer polyether, and improves the production efficiency; four steps of replacement, polymerization, curing and neutralization in a traditional monomer polyether production process are separated, all the steps are more effectively controlled, the utilization efficiency of the reaction kettle is increased, and the synthesis process has the advantages of simple control, stable product structure, and high double-bond retention rate.

Description

technical field [0001] The invention belongs to the technical field of polyether synthesis, and particularly relates to a synthesis process for producing a polycarboxylate water-reducing agent monomer polyether by a one-step method. Background technique [0002] As an indispensable building material today, concrete has entered the era of commercialization and high performance. The commercialization and high performance of concrete are realized by concrete admixtures. The most important and critical type of admixtures is water reducer. Polycarboxylate water reducer is a green and environmentally friendly high performance water reducer. The best and most promising new-generation water-reducing agent; it has a very strong dispersing ability, and it can show a high water-reducing efficiency with a small amount of reaction to engineering applications, so that the concrete can obtain high water-reducing efficiency. It also improves concrete pore structure, compactness, and contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08G65/26
CPCC08G65/2609C08G65/2624C08G2650/38C08G2650/50C08G2650/58C08G65/2606C08G65/2621C08G2650/22
Inventor 马彩凤来科李玉博
Owner 佳化化学泉州有限公司
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