Vegetable fiber-based polyether polyol and preparation method thereof

A plant fiber and polyol technology, applied in the field of polymer chemistry, can solve the problems of high concentration, loss in the liquefaction process, and decline in product yield, and achieve the effects of reducing the amount of residues, reducing the liquid-solid ratio, and reducing alcohol consumption.

Active Publication Date: 2013-09-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Stir and mix 80g PEG200 and 80g ethylene glycol to obtain a liquefaction reagent;

[0030] (2) Weigh 40g of masson pine wood powder that has been dried and crushed to 10-20 meshes, stir and mix with 40g of liquefaction reagent at room temperature (without temperature control, measured at 17°C), and let it stand for 5 minutes;

[0031] (3) Take 80g of the liquefaction reagent and put it in a glass four-neck flask equipped with a thermometer, condenser, stirrer and dropping funnel, heat it to 140°C in advance under stirring, then divide the mixture prepared in step (2) into 10 batches Add 8g in each batch, 1min between each batch, and always control the temperature fluctuation within ±5°C; after the mixture starts to feed, gradually add 0.8g of sulfuric acid with a mass fraction of 98% dropwise by controlling the plunger of the dropping funnel, and Ensure that the mixture and acid are added at the same time; after the addition, keep the temperature and stirring state,...

Embodiment 2

[0034] (1) Stir and mix 120g PEG200 and 60g propylene glycol to obtain a liquefaction reagent;

[0035] (2) Weigh 40g of larch wood powder that has been dried and pulverized to 30-40 mesh, stir and mix with 80g of liquefaction reagent at room temperature (no temperature control, measured at 20°C), and let it stand for 15 minutes;

[0036] (3) Take 70g of the liquefied reagent and put it in a glass four-neck flask equipped with a thermometer, condenser, stirrer and dropping funnel, heat it to 150°C in advance under stirring, then divide the mixture prepared in step (2) into 10 batches Add 12g in each batch, and control the temperature fluctuation within ±5°C at intervals of 5 minutes between batches; after the mixture starts to feed, gradually add 2g of phosphoric acid with a mass fraction of 85% by controlling the plunger of the dropping funnel, and ensure that the mixture Complete the addition of acid and acid at the same time; after the addition, keep the temperature and sti...

Embodiment 3

[0039] (1) Stir and mix 150g PEG200 and 50g glycerol to obtain a liquefaction reagent;

[0040] (2) Weigh 40g of red pine wood powder that has been dried and pulverized to 50-60 mesh, stir and mix with 120g of liquefaction reagent at room temperature (without temperature control, measured at 23°C), and let it stand for 30 minutes;

[0041] (3) Take 60g of the liquefied reagent and put it in a glass four-neck flask equipped with a thermometer, condenser, stirrer and dropping funnel, heat it to 160°C in advance under stirring, then divide the mixture prepared in step (2) into 10 batches Add it, add 16g in each batch, and control the temperature fluctuation within ±5°C at an interval of 5 minutes between batches; after the mixture starts to feed, gradually add 4g of sulfuric acid with a mass fraction of 98% by controlling the plunger of the dropping funnel, and ensure that the mixture Add the acid at the same time; keep the temperature and stirring state after the addition, conti...

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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....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H8/00C08G18/48
Inventor 谌凡更马琳张强
Owner SOUTH CHINA UNIV OF TECH
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