Vegetable fiber-based polyether polyol and preparation method thereof

Abstract

The invention discloses a preparation method of vegetable fiber-based polyether polyol. The preparation method comprises the following steps of: (1) stirring and mixing polyethylene glycol and low-molecular polyatomic alcohol according to the mass ratio of (1:1)-(20:1) and obtaining a liquefied reagent; (2) weighing 10 parts by mass of vegetable fiber material which is dried and crushed into 10-200 meshes, and after stirring and mixing with 10-50 parts by mass of liquefied reagent at room temperature, standing for 5 minutes to 12 hours; (3) under stirring, preheating 5-20 parts by mass of liquefied reagent to be 140-180 DEG C, adding the mixture obtained in the step (2), controlling the temperature, adding 0.2-4 parts by mass of inorganic oxyacid simultaneously and gradually, and ensuring simultaneous completion of adding of the mixture and the acid; maintaining the temperature and the stirring state before adding the material, continuously reacting for 20-120 minutes and stopping heating; and (4) adjusting the pH value to be 6-8; and then discharging. In the preparation method, the yield of liquefied products is improved, the liquid-solid ratio is reduced and the cost is saved.

Description

technical field [0001] The invention belongs to the field of polymer chemistry, in particular to a preparation method of plant fiber-based polyether polyol. More specifically, it relates to a polyether polyol obtained by liquefying plant fiber raw materials and a preparation method thereof. Background technique [0002] Plant fiber raw material is the most abundant biomass resource on earth, mainly composed of three components: cellulose, hemicellulose and lignin. The renewability of plant fiber raw materials makes it a natural resource with great utilization value. Whether it is to use the energy stored in the plant fiber raw material or to use the plant fiber to produce chemical products, it is of great significance. However, the crystallinity of cellulose in plant fiber raw materials is as high as 60% to 70%, and lignin has a three-dimensional network structure, and the reactivity of the two is poor, so that plant fiber raw materials cannot be effectively used directly....

AI Technical Summary

Problems solved by technology

[0006] However, there are some disadvantages in the above-mentioned technology: (1) the liquefaction reagent used is a more active polyhydric alcohol, and these alcohols are easily esterified with inorganic oxyacids at high temperature to generate volatile esters, while the polyhydric alcohol part will be degraded , resulting in loss in the liquefaction process and a decrease in product yield; (2) The concentration of the inorganic oxyacid is too high when it is added at one time, and it is easy to form a condensate. The ability will decrease, resulting in poor liquefaction effect in the later stage of the reaction