Methyl allyl alcohol, also known as "isobutenol", is an important organic intermediate used in the snthesis of spices, resins and so on. Methyl allyl alcohol polyoxyethylene ether (HPEG) was synthesized from methl alll alcohol and ethylene oxide to be used as a new generation of water reducing agent for high-performance concrete.
Methylallyl alcohol polyoxyethylene ether is easily soluble in water and a variety of organic solvents, which is an important raw material of a new generation of polycarboxylic acid water-reducing gent.
Using the product in the synthesis of poly carboxlic acid high efficiency water reducing agent with high efficiency particle dispersion performance and keeping the ability, has high water reducing rate, Iow cement usage, enhance the effect is good, durable performance is good, not corroded reinforced, friendly to environment, and many other advantages, can be used on-site mixing and long-distance transmission of high strength of commercial concrete(C60).
Polycarboxylc acid is the concrete water reducing agent with high efficiency, non-toxic, non-poluting, and friendly to environment, and many other advantages, together concrete water reducing agent of carboxy acid is usually with allyl polyoxyethlene/polyethylene oxide allyl ether as main monomers, and maleic ahydride, acrylic acid, sodium allyl sulfonic acid, methyl acrylic acid and styrene copolymer of unsaturated compounds.
The invention relates to a reparation method of methyl allyl alcohol polyoxyethylene ether, which in cludes polymerization reaction of methyl allyl alcohol and ethylene oxide in the presence of an accelerant to obtain methyl allyl alcohol polyoxyethylene ether. The catalyst was sodium methyl allyyl alcohol or potassium methyl allyl alcohol. The molar ratio of methyl allyl alcohol to ethylene oxide was 1.0:(5.0~78.0). The amount of catalst was 0.10-0.60 wt% based on methyl allyl alcohol. The reaction pressure is 0.10~0.40 MPaG, the reaction temperature is 50~150°C， and the reaction time is 3~7 hours. The technical key is to use a more ideal catalyst, the result can increase the product's desaturation by more than 10%.