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A kind of mixed alcohol polyoxyethylene ether superplasticizer macromonomer and its preparation method and application

A technology of alcohol polyoxyethylene ether and water reducer, which is applied in the field of mixed alcohol polyoxyethylene ether water reducer macromonomer, can solve the problems of low water reducing rate and flow retention, and achieve stable reaction temperature control, The effect of stabilizing temperature and avoiding safety risks

Active Publication Date: 2021-08-10
三江化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, as my country's urbanization process continues to accelerate, the construction of large-scale infrastructure continues to promote the development of concrete technology, coupled with many factors affecting the composition of concrete such as cement, fly ash, sand and gravel, the existing polycarboxylate superplasticizers are exposed. Performance defects of low water reducing rate and flow retention
The downstream water reducer synthesis generally maintains its slump retention performance by adding admixtures, but it does not fundamentally solve the problem of slump loss over time

Method used

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  • A kind of mixed alcohol polyoxyethylene ether superplasticizer macromonomer and its preparation method and application
  • A kind of mixed alcohol polyoxyethylene ether superplasticizer macromonomer and its preparation method and application
  • A kind of mixed alcohol polyoxyethylene ether superplasticizer macromonomer and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0027] A preparation method of a mixed alcohol polyoxyethylene ether water reducer macromonomer, comprising the following steps:

[0028] 1) In the mixed raw material composed of 89.1 g of initiator methallyl alcohol and 15.72 g of isopentenol, first add 3.02 g of potassium hydroxide, after the potassium hydroxide is completely dissolved, then add 1.24 g of sodium metal, and wait until After the sodium metal is completely dissolved, a homogeneous mixed solution is formed. Shake the obtained mixed solution into the reactor, start the reactor to stir, adjust the rotation speed to 215r / min, replace the air in the reactor with nitrogen repeatedly for three times, heat the mixed solution in the reactor, and heat the temperature in the reactor to about 85°C Then start vacuuming, control the vacuum degree in the reactor to -0.1MPa, then replace the air in the reactor with nitrogen repeatedly three times, and backfill nitrogen for the last time until the pressure in the reactor is 0.0...

Embodiment 2

[0031] Repeat the step process of embodiment 1, difference is:

[0032] Step 1) In the process of synthesizing the mixed alcohol polyoxyethylene ether intermediate, the feeding quality of methallyl alcohol, isopentenol, potassium hydroxide and metal sodium is 92.45g, 10.27g, 2.95g and 1.21g respectively, The total amount of ethylene oxide introduced was 752g, and 857.47g of crude mixed alcohol polyoxyethylene ether intermediate was finally prepared.

[0033] Step 2) Take 240.66 g of the crude mixed alcohol polyoxyethylene ether intermediate prepared in step 1) to synthesize the mixed alcohol polyoxyethylene ether. During the process of synthesizing the mixed alcohol polyoxyethylene ether product, the total amount of ethylene oxide introduced was 722g, and 962.66g of the mixed alcohol polyoxyethylene ether was finally prepared.

Embodiment 3

[0035] Repeat the step process of embodiment 1, difference is:

[0036] Step 1) In the process of synthesizing the mixed alcohol polyoxyethylene ether intermediate, the feeding quality of methallyl alcohol, isopentenol, potassium hydroxide and metal sodium is 83.22g, 11.35g, 2.76g and 1.13g respectively, The total amount of ethylene oxide introduced was 694g, and 791.17g of the crude product of the mixed alcohol polyoxyethylene ether intermediate was finally prepared.

[0037] Step 2) Take 253.2 g of the crude mixed alcohol polyoxyethylene ether intermediate prepared in step 1) to synthesize the mixed alcohol polyoxyethylene ether. During the process of synthesizing the mixed alcohol polyoxyethylene ether product, the total amount of ethylene oxide introduced was 759.1 g, and 1012.3 g of mixed alcohol polyoxyethylene ether was finally prepared.

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Abstract

The invention discloses a mixed alcohol polyoxyethylene ether water reducer macromonomer and its preparation method and application. The preparation process of the mixed alcohol polyoxyethylene ether water reducer macromonomer is as follows: under nitrogen atmosphere , Potassium hydroxide, sodium catalyst, methallyl alcohol, prenyl alcohol and ethylene oxide are mixed and stirred to react, and the mixed alcohol polyoxyethylene ether intermediate is synthesized, and the mixed alcohol polyoxyethylene ether intermediate is obtained. Then react with ethylene oxide under a nitrogen atmosphere to synthesize the final product mixed alcohol polyoxyethylene ether, which is a macromonomer used to prepare polycarboxylate water reducers. The mixed alcohol polyoxyethylene ether synthesized by the present invention has both the basic molecular skeleton structure of isopentenol and methallyl alcohol. When the mixed alcohol polyoxyethylene ether product is used to prepare polycarboxylate water reducer , Polycarboxylate superplasticizer is applied to cement, it can maintain the water-reducing performance and at the same time have good dispersion retention.

Description

technical field [0001] The invention relates to a macromonomer of a mixed alcohol polyoxyethylene ether water reducer and its preparation method and application. Background technique [0002] Polycarboxylate high-efficiency superplasticizer has the advantages of low dosage, high water reduction, strong slump retention ability, and wide adaptability to cement because of its special comb-shaped structure. Has been widely used. Polyether macromonomer is the main raw material for synthesizing polycarboxylate water reducer. At present, the widely used macromonomers in the market are HPEG synthesized from methallyl alcohol and TPEG synthesized from isopentenol. [0003] However, as my country's urbanization process continues to accelerate, the construction of large-scale infrastructure continues to promote the development of concrete technology, coupled with many factors affecting the composition of concrete such as cement, fly ash, sand and gravel, the existing polycarboxylate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/28C08F283/06C08F220/06C04B24/26C04B103/30
Inventor 蔡玉纪宝琳胡爱良沈美勤郭双浦沈燕朱文杰
Owner 三江化工有限公司
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