Functional composite polyether, and preparation method and application thereof
A composite polyether technology, which is applied in the field of functional composite polyether and its preparation, can solve the problem that the catalyst cannot meet the requirements of low unsaturation, high molecular weight and high activity at the same time, and the water-reducing Water rate and other issues, to achieve the effect of promoting strength development in the later stage, reducing air entrainment, and increasing water reduction rate
Pending Publication Date: 2022-02-01
湖北凌安科技有限公司
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Problems solved by technology
In the process of polyether preparation, only ethylene oxide is used as the grafted side chain, and the final prepared water reducer side chain has strong water retention capacity and poor dispersion performance, which affects the water reducing rate.
[0005] Patent application CN104497298A discloses a method for preparing polyether polyols with low unsaturation, high molecular weight and high activity. and high activity issues
No polymerization inhibitor is used in the entire reaction system, and partial polymerization and self-polymerization reactions will occur between highly active polyether polyols, resulting in major problems in the homogeneity of the final prepared polyether polyols
Method used
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Embodiment 1
[0024] A functional composite polyether prepared from the following raw materials:
[0025] Propylene glycol monoallyl ether 35.6 parts, ethylene oxide 115.5 parts, propylene oxide 352.5 parts, aluminum phenate: 5.5 parts.
[0026] The specific preparation method comprises the following steps:
[0027] Step 1: Add 80% propylene glycol monoallyl ether and 3.5 parts of aluminum phenoxide in an autoclave equipped with a stirrer and a thermometer, start vacuuming to gauge pressure-0.098MPa after nitrogen replacement for 3 times, and then Raise the temperature to 120°C and start dehydration for 1h. Then feed a part of propylene oxide into the reactor, feed 60% propylene oxide into the reactor, control the pressure to be less than 0.45MPa, add the remaining propylene glycol monoallyl ether and aluminum phenolate after passing through and continue to pass through Add the remaining propylene oxide and all the ethylene oxide, heat-preserve and age at 120°C to negative pressure, cool ...
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The invention provides a functional composite polyether, and a preparation method and application thereof. The polyether is mainly prepared 34.2 to 36.7 parts of mixed alcohol, 464.3 to 478.8 parts of cyclic monomer and 4.5 to 6.2 parts of catalyst. According to the invention, a plurality of alcohol heads with different properties are adopted as initiators to be copolymerized with an alkylene oxide composition in a high-temperature reaction kettle, and the proportion and reaction conditions of each reaction monomer are reasonably controlled, so that the prepared polyether has the advantages of high effective content, low byproduct content, narrow molecular weight distribution range, high double bond retention rate and the like; and a water reducing agent synthesized by the polyether prepared by the invention is good in dispersity and high in water reducing rate, and the compressive strength of concrete at each age can be remarkably improved.
Description
technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a functional composite polyether and its preparation method and application. Background technique [0002] Polycarboxylic acid-based concrete water-reducing agent has the characteristics of low dosage and high water-reducing rate, and the concrete mixture has good fluidity and flow retention, low slump loss, great reinforcement effect potential and low shrinkage rate. High-performance polycarboxylate superplasticizers are more widely used and more adaptable, and can be used in important fields such as water conservancy and nuclear power engineering. However, there is a common defect in the existing water reducers, that is, the degree of unsaturation of the prepared methallyl alcohol polyoxyethylene / polyoxypropylene ether is relatively low. The degree of unsaturation reflects the density of double bonds, and the lower degree of unsaturation will limit the c...
Claims
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IPC IPC(8): C08G65/28C08F283/06C04B24/26C04B103/30
CPCC08G65/2612C08G65/2609C08G65/2696C08F283/065C04B24/2605C04B2103/302
Inventor 张勇刘衍东李敏张新亮闵闰欧阳涛
Owner 湖北凌安科技有限公司