Plant fiber-based polylol and preparation method thereof

A plant fiber and polyol technology, applied in the field of polymer chemistry, can solve the problems of unsatisfactory and inactivation, and achieve the effect of high catalytic activity

Active Publication Date: 2013-07-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, metal oxide solid superacids are prone to deactivation in alcohol reactants
This type of reaction system cannot meet the needs of producing polyether polyols and polyester polyols

Method used

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  • Plant fiber-based polylol and preparation method thereof
  • Plant fiber-based polylol and preparation method thereof
  • Plant fiber-based polylol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of catalyst: Dissolve 10g of phosphotungstic acid in 20g of deionized water, then add 10g of SiO 2 After standing for 5 hours, dry at 100°C, place in a muffle furnace, and roast at 250°C for 5 hours to obtain the required solid heteropolyacid catalyst; (2) liquefaction of plant fiber raw materials: Mix the liquefaction reagent consisting of 5g of polyethylene glycol 200 and 5g of ethylene glycol, 0.01g of the solid heteropolyacid obtained in step (1) and 10g of dry 20-60 mesh corn cob powder raw materials evenly, and heat the mixture to 100°C , then evacuate to 0.1MPa (negative pressure), keep warm for 150min, and then discharge, the product obtained is centrifuged at a speed of 1000r / min with a centrifuge, the liquid product is plant polyol, and the solid is liquefied residue and solid heteropoly Acid catalyst; (3) Regeneration of solid heteropolyacid: the solid heteropolyacid recovered in step (2) was removed in an oven to remove moisture, then washed ...

Embodiment 2

[0037] (1) Preparation of catalyst: Dissolve 10g of silicotungstic acid in 20g of deionized water, then add 10g of activated carbon, let it stand for 20 hours, dry it at 90°C, and then place it in a muffle furnace, in an air-isolated environment Under conditions, roasting 2 hours at 400 ℃ of temperature, obtain required solid heteropolyacid catalyst; (2) liquefaction of plant fiber raw material: 40g Polyethylene Glycol 200, 9.5g Polyethylene Glycol 800 and 0.5g Propylene Glycol The liquefied reagent, 0.1g of the solid heteropolyacid obtained in step (1) and 10g of dry 160-200 mesh corn stalk powder raw materials are mixed evenly, and the mixture is heated to 150°C, and then vacuumed to 0.5MPa (negative pressure) , while insulated for 100min, then discharging, the product obtained is centrifuged at 3000r / min rotating speed with a centrifuge, the liquid product is a plant polyol, and the solid is a liquefaction residue and a solid heteropolyacid catalyst; (3) solid heteropolyacid...

Embodiment 3

[0039] (1) Preparation of catalyst: Dissolve 10 g of phosphomolybdenum heteropoly acid in 20 g of deionized water, then add 10 g of macroporous MCM-41 molecular sieve, leave it for 15 hours, dry at 95°C, and place In the muffle furnace, roast at 300°C for 4 hours to obtain the required solid heteropolyacid catalyst; (2) liquefaction of plant fiber raw materials: the liquefaction reagent composed of 25g polyethylene glycol 400 and 5g glycerol, 0.45g Mix the solid heteropolyacid obtained in step (1) and 10 g of dry reed powder raw materials of 60-100 mesh evenly, heat the mixture to 140°C, then vacuumize to 0.5MPa (negative pressure), keep it warm for 30min, and then discharge , the product that obtains is centrifuged at 3500r / min rotating speed with centrifuge, and liquid product is plant polyol, and solid matter is liquefaction residue and solid heteropolyacid catalyst; (3) regeneration of solid heteropolyacid: reclaim step (2) The solid heteropolyacid was dehydrated in an ove...

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Abstract

The invention discloses a preparation method of plant fiber-based polylol, belonging to the field of high polymer chemistry. The preparation method comprises the following steps of: (1) dissolving 10 parts by mass of solid heteropoly acid into 20 parts by mass of deionized water, adding 10 parts by mass of carrier, standing for at least 5 hours, drying and baking to obtain a needed solid heteropoly acid catalyst; and (2) uniformly mixing 10-50 parts by mass of liquefying reagent, 0.01-0.6 part by mass of solid heteropoly acid and 10 parts by mass of dried plant fiber raw material, heating themixture to 100-200 DEG C, vacuumizing to 0.1-0.5MPa, preserving heat for 20-150 minutes, discharging, and centrifuging a feed liquid to obtain a liquid product, namely plant polylol and solids, namely liquefying residues and the solid heteropoly acid catalyst, wherein the hydroxyl value of liquefying product is 80-300 mgKOH / g. According to the method, the neutralizing process of the liquefying product can be eliminated, impurities in the liquefying product are reduced, and the application of the liquefying product is facilitated.

Description

technical field [0001] The invention relates to a plant fiber-based polyol and a preparation method thereof, and more specifically relates to a plant fiber-based polyether polyol and a preparation method thereof, belonging to the field of polymer chemistry. Background technique [0002] Polyurethane is an important class of polymers, which are obtained by the reaction of polyether polyol (or polyester polyol) and isocyanate. Most of the polyols used to make polyurethanes are made from petrochemicals. Due to the limited and rapidly decreasing oil reserves on the earth, people began to seek to prepare polyether polyols from natural products, and tried to use such polyols to partially or completely replace the existing petroleum-based polyols. Starting from vegetable oils or carbohydrates, polyol products can be obtained. [0003] Plant fiber is the most abundant renewable natural resource on earth. The three major components of plant fibers, cellulose, hemicellulose and lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08H8/00B01J27/188B01J23/30B01J29/78B01J31/34B01J27/19
CPCY02P20/50
Inventor 谌凡更朱俐静马琳周雪松
Owner SOUTH CHINA UNIV OF TECH
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