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Plant fiber based polyether polyol and preparation method thereof

A plant fiber-based polyether technology, applied in the field of polymer chemistry, can solve the problems of not being able to meet the requirements for the preparation of polyurethane, the reaction cannot be fully and uniformly carried out, and the plant fiber cannot be fully infiltrated, etc., to overcome solvation and Effects of preventing condensation, reducing condensation, and improving solubility

Inactive Publication Date: 2009-05-13
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The disadvantages of the above-mentioned technology are: (1) most of these liquefaction methods need to add phenol to promote the solvation of plant fibers and prevent condensation, and phenol has serious negative effects on subsequent applications; (2) in the liquefaction process, the liquid-solid higher than usual
If a higher liquid-solid ratio is not used, the solvent cannot fully infiltrate the plant fibers, resulting in insufficient and uniform reaction.
And if the liquefaction reaction is insufficient, the plant fiber raw material cannot be fully degraded, and the hydroxyl value of the final liquefaction product, that is, the plant polyol, will be low, which cannot well meet the requirements for the preparation of polyurethane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Mix 22.5 g each of 1,3-propanediol and polyethylene glycol 400, add 0.3 g of 98% sulfuric acid, and 0.3 g of nonylphenol polyoxyethylene ether (trade name NP-9), and mix well to obtain a liquefying reagent ;

[0034] (2) Add the above-mentioned liquefaction reagent to a three-necked flask equipped with a stirring bar, a water separator and a thermometer, and heat it to 120°C, and add 30 g of dried masson pine wood powder in 4 batches; the amount of wood powder added for the first time It is 10g, the second time is 8g, the third time is 6g, and the fourth time is 6g. After each addition, the temperature was raised to 120° C. before the addition, and the temperature was maintained for 20 minutes. After all the wood powder is added, continue the heat preservation reaction for 90 minutes;

[0035] (3) Add solid KOH to neutralize the acidic substances in the reaction mixture, and the amount to be added is based on the neutral pH of the reaction system;

[0036] (4) Di...

Embodiment 2

[0038] (1) 30g of 4-butanediol and 30g of polyethylene glycol 400 were mixed, 0.4g of 98% sulfuric acid was added, 3g of nonylphenol polyoxyethylene ether (trade name NP-9), and the liquefaction reagent was obtained after mixing;

[0039] (2) Add the above-mentioned liquefaction reagent to a three-necked flask equipped with a stirring rod, a water separator and a thermometer, and heat it to 130° C., and add 30 g of dried wheat straw in 3 batches; the amount of wheat straw added for the first time is 15 g, Add 9g for the second time, and 6g for the third time; after each time of feeding, raise the temperature to 130°C before feeding, and keep the temperature for 20 minutes; after adding all the wheat straw, continue to keep warm for 90 minutes;

[0040] (3) Add solid NaOH to neutralize the acidic substances in the reaction mixture, and the amount of addition is adjusted to neutral with the pH of the reaction system;

[0041] (4) Discharging to obtain a black sticky plant polyol...

Embodiment 3

[0043] (1) Mix 30g of 4-butanediol and 30g of polyethylene glycol 400, add 0.4g of 36% hydrochloric acid, 3g of nonylphenol polyoxyethylene ether (trade name NP-9), and mix to obtain a liquefaction reagent;

[0044] (2) Add the above-mentioned liquefaction reagent to a three-necked flask equipped with a stirring bar, a water separator and a thermometer, and heat it to 130° C., and add 30 g of dried wheat straw in 4 batches; the amount of wheat straw added for the first time is 12 g, The remaining 18g was added in 3 times, among which 8g was added for the first time, 6g was added for the second time, and 4g was added for the third time. After finishing, continue insulation reaction 90min;

[0045] (3) Add NaOH solids to neutralize the acidic substances in the reaction mixture, and the amount to be added is based on the neutral pH of the reaction system;

[0046] (4) Discharging to obtain a black sticky plant polyol product with a hydroxyl value of about 440 mgKOH / g.

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Abstract

The invention relates to plant fiber base polyether glycol and a preparation method thereof, which belong to the field of polymer chemistry. The preparation method is as follows: mixed alcohol, an acid and a non-ionic surfactant are uniformly mixed to obtain a liquefied reagent; dried plant fiber raw materials are added into the liquefied reagent which is heated to the temperature of between 120 and 160 DEG C, and added in batch; after feeding is over each time, the temperature is raised to the temperature before the feeding, and maintained until the mixture reacts for 10 to 20 minutes; the temperature is maintained after the feeding is over, and the mixture reacts for 20 to 120 minutes; solid alkali is added into a reaction system until the pH value is neutral; and the product is obtained after discharging. The plant fiber base polyether glycol prepared by the method can be used for producing hard polyurethane foam with the function of heat insulation.

Description

technical field [0001] The invention relates to a plant polyol and a preparation method thereof, in particular to a polyether polyol for preparing polyurethane based on plant fiber raw materials and a preparation method thereof, belonging to the field of polymer chemistry. Background technique [0002] Polyurethane is a polymer with repeating structural units of urethane segments produced by the reaction of isocyanate and polyol. At present, polyurethane materials have been widely used in industrial fields such as transportation, metallurgy, construction, light industry (papermaking, shoemaking, leather), printing and printing and dyeing, and their consumption is also increasing. [0003] Most of the polyols used in the preparation of polyurethanes are made from petrochemical products. Due to rising oil prices and depletion of resources, people have to seek polyether polyols based on natural products to partially or completely replace the current polyether polyols. [0004...

Claims

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Application Information

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IPC IPC(8): C08H5/04C08G18/48C08H8/00
Inventor 谌凡更敖日格勒刘娟娟万国江洪育贤郑顺涛
Owner SOUTH CHINA UNIV OF TECH
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