Alkyl polyoxyether and preparation method thereof, and polycarboxylate superplasticizer prepared from alkyl polyoxyether and preparation method thereof
A technology of polyoxyalkyl ether and polycarboxylic acid, applied in the fields of polyoxyalkylene water reducing agent and preparation, polyoxyalkylene ether and preparation thereof, can solve the problem of concrete bleeding and segregation, high production cost and low water reduction rate and other problems, to achieve a good slow-release effect, delay the hydrolysis rate, and improve the water reduction rate.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Example Embodiment
[0041] Example 1 Synthesis of monomer A
[0042] Add 26.8g cinnamyl alcohol and 0.35g sodium methoxide into the high-pressure reactor, seal the equipment, and replace the air in the high-pressure reactor with nitrogen. The temperature is raised to 100~120℃, and 290g of ethylene oxide raw material is introduced. When the temperature rises, the pressure drops It is indicated that the reaction is initiated, and then 30 g of propylene oxide is introduced, and the reaction temperature is controlled at 110-130°C and the pressure in the kettle is at 0.3-0.5 MPa.
[0043] After the reaction is completed, the pressure in the kettle gradually drops to the point where the pressure does not drop for 30 consecutive minutes, and the material is aged and cooled to obtain the A monomer. NMR of A monomer 1 H spectrum such as figure 1 Shown (400MHz, D 2 O).
Example Embodiment
[0044] Example 2 Synthesis of monomer B
[0045] Add 20.5g 4-hydroxystyrene and 0.36g sodium methoxide into the high-pressure reactor, seal the equipment, replace the air in the high-pressure reactor with nitrogen, raise the temperature to 100-120°C, and feed 300g ethylene oxide raw material. The increase in temperature and the decrease in pressure indicate the initiation of the reaction. After that, 45 g of propylene oxide is introduced, and the reaction temperature is controlled at 110-130°C and the pressure in the kettle is at 0.3-0.5 MPa.
[0046] After the reaction is completed, the pressure in the kettle gradually drops to the point where the pressure does not drop for 30 consecutive minutes, and the material is aged and cooled to obtain the B monomer. NMR of B monomer 1 H spectrum such as figure 2 Shown (400MHz, deuterated dimethyl sulfoxide).
Example Embodiment
[0047] Example 3 Preparation of polycarboxylic acid water reducing agent
[0048] Add 295g monomer A, 275g deionized water, 3.5g cyclohexyl acrylate to a 1000ml round bottom three-necked flask, stir to dissolve evenly, add 1.8g hydrogen peroxide with a mass concentration of 30%, reaction temperature 40℃, and add A solution dropwise With the B solution, the dripping time is 1h. After the dripping, continue to react for 1h to obtain a clear and bright polycarboxylic acid water-reducing agent mother liquor.
[0049] The first solution is formed by 28g acrylic acid, 20g deionized water and 0.5g ascorbic acid; the second solution is formed by 1.2g thioglycolic acid and 30g deionized water.
[0050] The weight average molecular weight of the polycarboxylic acid water reducing agent obtained by gel chromatography test is about 35,700.
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2023 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap