Method for synthesizing high-molecular-weight thermoplastic phenol resin

Abstract

The invention relates to a method used for sp synthesis of phenolic resin. A synthesis method for thermoplastic phenolic resin of high molecular weight is characterized in that the invention comprises four following steps: 1) the selection of raw materials: the weight portion of each raw materials: water: 50 to 250, phenol: 90 to 160, formaldehyde liquid: 60 to 120, hexamethylene tetramine:15 to 35, gum Arabic powder: 3 to 10, aluminum oxide powder:2 to 8, the mass concentration of the formaldehyde liquid is 37 percents. 2) some water, the phenol and the formaldehyde liquid are taken and added to a stirring reaction vessel, and the reaction time is ranging from three hours to five hours after adjusting pH value to 2 to 5 and increasing the temperature to 85 DEG C to 95 DEG C. 3) some gum Arabic powder and some hexamethylene tetramine are uniformly mixed, the remained gum Arabic powder and the aluminum oxide powder are added after the reaction time ranging from a half hour to one and a half hours and uniformly mixed with the water, and the remained hexamethylene tetramine is dissolved in the some water and is added into the reaction vessel after five minutes to 30 minutes, the heating is stopped after the reaction time ranging from 25 minutes to 40 minutes, and the temperature of a reactor is decreased to the room temperature. 4) the product is obtained after water washing, filtering and drying. The product obtained by the synthesis method has the advantages of high molecular weight, high heat-resistance, high toughness; the technique is simple and the cost is low.

Description

technical field [0001] The invention relates to a method for synthesizing phenolic resin by a suspension method. Background technique [0002] Phenolic resin is the earliest industrialized synthetic resin in the world, with a history of nearly a hundred years. The raw materials are readily available, the cost is low, the cured product has good heat resistance and mechanical properties, and the performance is stable. Therefore, phenolic resins have gradually replaced engineering plastics and some metal and alloy materials in many fields such as automobiles, electronics, electrical, transportation, and military, and have been widely used. The solid content of phenolic resin synthesized by the traditional formaldehyde solution method is generally 50% to 55%. The dehydration or drying process not only produces a large amount of waste water containing phenol, aldehyde and alcohol, but also increases production energy consumption and reduces labor efficiency. According to statis...

AI Technical Summary

Problems solved by technology

According to statistics, the average production of 1 ton of phenolic resin produces about 650-900 kilograms of wastewater, causing serious environmental pollution.