A kind of isopentenol random polyether and preparation method thereof

Abstract

The invention relates to an isopentenyl alcohol random polyether and a preparation method thereof, and belongs to the technical field of polyether compound synthesis in organic chemistry. According to the preparation method, at first, part of isopentenyl alcohol and a catalyst (A) carry out reactions, then the reaction system is added into residual isopentenyl alcohol, ethylene oxide is introduced into the mixture to carry out reactions to obtain oligomer; part of obtained oligomer and a catalyst (B) carry out reactions, then the reaction system is added into residual oligomer, and a mixture of ethylene oxide and propylene oxide is introduced into the mixture to carry out reactions to obtain isopentenyl alcohol random polyether. The isopentenyl alcohol random polyether is used to prepare a polycarboxylic acid water reducer, the quality of prepared isopentenyl alcohol EO / PO random polyether is stable, the application effect is good, and the isopentenyl alcohol random polyether is suitable for the synthesis of a high performance polycarboxylic acid water reducer.

Description

technical field [0001] The invention relates to a prenyl alcohol EO / PO random polyether (for convenience of description, hereinafter may also be abbreviated as prenyl alcohol random polyether) and a preparation method thereof, belonging to the synthesis technology of polyether compounds in organic chemistry field. Background technique [0002] Polycarboxylate superplasticizer is one of the most widely used cement and concrete admixtures in the construction industry. At present, mainly enol small molecular compounds are used as the initiator, and under the condition of alkali metal hydroxide as the catalyst, unsaturated polyether macromonomers with different molecular weights are reacted, and then reacted with small molecular units such as acrylic acid and maleic anhydride. The body is subjected to aqueous solution free radical polymerization to obtain a polycarboxylate water reducer. [0003] This type of water-reducing agent has a high water-reducing rate. Compared with n...

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Problems solved by technology

However, since the polyether side chains of pure EO are easy to form hydrogen bonds, the fluidity of concrete becomes poor

Fang Chenwei and others tried to introduce propylene oxide blocks in the side chain, but the block polyether has excellent foaming and air-entraining properties, resulting in excessive air content in the concrete, which affects the workability of the mixture and the mechanical properties of the molded products. and durability

Moreover, the three-block structure of PEO-PPO-PEO, monomer synthesis and preparation take a long time and the process is cumbersome

[0004] In order to overcome the obvious shortcomings of the above macromonomer structure in engineering, there is a Chinese published patent No. CN105504261 A, the patent name is: random copolyether macromonomer, water reducer prepared therefrom, preparation method and application, Provide a preparation method through random copolymerization, adopt one-step synthesis to obtain EO / PO random copolyether macromonomer with smaller hydrodynamic radius, but slightly increased steric hindrance effect, but after synthesizing the water reducer, At the same time, it increases the steric hindrance between the cement molecules, slows down the hydration with cement, and deteriorates the workability, which affects the workability of the mixture.

[0005] Simultaneously, the existing synthetic technology about prenyl alcohol polyoxyethylene ether, the patent No. disclosed in China is CN101928392A, and the patent name is: a kind of synthetic method of prenyl alcohol polyoxyethylene ether, has introduced prenyl alcohol polyoxyethylene ether in Solid sodium methoxide, sodium methoxide methanol solution, potassium hydroxide solid or aqueous solution, sodium hydroxide or aqueous solution, sodium, sodium isoenolate or a mixture of more than one of them react with ethylene oxide to form iso Pentenol polyoxyethylene ether, but for solid sodium methoxide and sodium methoxide methanol solution, more by-products such as polyethylene glycol monomethyl ether, etc. will be produced, and the effective content will be reduced, the molecular weight distribution will be broadened, and the double bond will be retained. The efficiency is reduced, thereby affecting its application performance; and for potassium hydroxide solid or aqueous solution, sodium hydroxide solid or aqueous solution, more by-products such as polyethylene glycol will be produced, which will lead to a decrease in effective content and a broadening of molecular weight distribution. The bond retention rate is reduced, thereby affecting its application performance; and for sodium and isoamyl sodium enolate, the preparation conditions and quality of the catalyst sodium prenate and the addition method of catalyst sodium and sodium prenate will still affect the isopentyl sodium. The quality of enol polyoxyethylene ether leads to the generation of by-products such as polyethylene glycol, the broadening of molecular weight distribution, and the reduction of double bond retention, thereby reducing the application effect of isopentenol polyoxyethylene ether

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