Method for preparing biodegradable polyurethane rigid foam from bamboo waste liquefaction products

A liquefied product, rigid foam technology, applied in the field of material chemical industry, can solve the problem of high price of liquefaction agent, and achieve the effect of alleviating energy and environmental crisis, mild reaction conditions and good liquefaction effect

Inactive Publication Date: 2009-02-11
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem is that the price of liquefaction agents such as ethylene carbonate is very expensive, and due to the secondary condens

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 80 kg of polyethylene glycol 400, 20 kg of crude glycerin, and 2 kg of concentrated sulfuric acid into the reaction vessel, turn on the condensing reflux device, start the agitator, heat to 160 ° C, and add 30 kg of crushed and dried The bamboo chips of the 2-year-old Phyllostachys moso bamboo of 80 mesh sieves, after stirring and reacting for 3 hours, take out and cool.

[0022] Neutralize the above-mentioned liquefied product with magnesium oxide to neutral, take 100 kg of bamboo waste liquefied product and add it to the foaming tank, add 3 kg of silicone oil, 4 kg of composite catalyst, and 15 kg of flame retardant at the same time, stir evenly, add 150 kg of PAPI, stirred for 10 seconds, quickly introduced into the mold to solidify and shape. After standing at room temperature for 24 hours, export the mold to obtain semi-rigid polyurethane foam.

Embodiment 2

[0024] Add 70 kg of polyethylene glycol 400, 30 kg of crude glycerin, and 5 kg of concentrated sulfuric acid into the reaction vessel, turn on the condensing reflux device, start the agitator, heat to 160 ° C, and add 30 kg of crushed and dried The bamboo chips of the perennial moso bamboo of 80 mesh sieves, after stirring and reacting for 1.5 hours, add 4 kilograms of FeSO4, take out cooling after continuing to react for 1 hour.

[0025] Neutralize the above-mentioned liquefied product with magnesium oxide to neutral, take 100 kg of bamboo waste liquefied product and add it to the foaming tank, add 3 kg of silicone oil, 5 kg of composite catalyst, and 15 kg of flame retardant at the same time, stir evenly, add 140 kg of PAPI, stirred for 10 seconds, quickly introduced into the mold to solidify and shape. After standing at room temperature for 24 hours, export the mold to obtain semi-rigid polyurethane foam.

Embodiment 3

[0027] Add 60 kg of polyethylene glycol 400, 40 kg of crude glycerin, and 4 kg of concentrated sulfuric acid into the reaction vessel, turn on the condensing and reflux device, start the agitator, heat to 160 ° C, and add 25 kg of crushed and dried The bamboo chips of the 3-year-old Phyllostachys moso bamboo of 80 mesh sieves, after stirring and reacting for 3 hours, take out and cool.

[0028] Neutralize the above-mentioned liquefied product with magnesium oxide to neutral, take 100 kg of bamboo waste liquefied product and add it to the foaming tank, add 3 kg of silicone oil, 3 kg of composite catalyst, and 15 kg of flame retardant at the same time, stir evenly, add 130 kg of PAPI, stirred for 10 seconds, quickly introduced into the mold to solidify and shape. After standing at room temperature for 24 hours, export the mold to obtain semi-rigid polyurethane foam.

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Abstract

The invention discloses a method for preparing biodegradable rigid polyurethane foam with liquefaction products of bamboo waste, which comprises the following steps: 1 mass portion of crude glycerin/polyethylene glycol liquefying solvent and 0.02-0.04 mass portion of concentrated sulfuric acid are added into a reaction vessel, heated till the temperature reaches 120-180 DEG C after a reflux condensation tube is connected to the reaction vessel; 0.2-0.5 mass portion of crushed and dried bamboo waste is added, reacted for 90-180min with stirring, taken out and cooled and neutralized by MgO till being neutral; 1 mass portion of liquefaction products of bamboo waste, 0.02-0.08 portion of a dibutyl tin dilaurate/triethylene diamine mixed catalyst, 0.02-0.06 portion of silicone oil, 0.02-0.1 portion of water and 0.1-0.15 portion of fire retardant are added into a container, premixed for 20-30s when stirred at 2,000r/min, added with sufficient PAPI with the molar ratio between isocyanato-NCO in PAPI and hydroxyl group-OH in bamboo waste liquefaction products being 0.6-1.2, stirred for 10s-15s at 1,000r/min, put into a mould, foamed with standing at room temperature, placed for slaking and mould separating at room temperature for 24h-72h after reaction. The method fully utilizes resources, reduces liquefaction cost, and has a mild reaction temperature and stable liquefaction products; the performance of obtained foam meets the national standard and biodegradability.

Description

technical field [0001] The invention relates to a method for preparing a biodegradable polyurethane rigid foam from a liquefied product of bamboo waste, and belongs to the field of material chemical industry. technical background [0002] Petroleum resources are becoming increasingly depleted, and the supply of various polymer monomers from petroleum is increasingly restricted. As the main raw material of the polyurethane industry, the price of polyether polyols has skyrocketed, which has seriously affected and hindered the healthy development of the polyurethane industry. The petroleum-based chemical industry has also caused serious pollution to the environment. Faced with the tense situation of energy and raw materials, as well as the increasingly serious problem of "white pollution", people naturally turn their attention to the issue of more efficient use of biomass resources. [0003] Bamboo forest is one of the important forest resources in my country. According to st...

Claims

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Application Information

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IPC IPC(8): C08G18/28C08G101/00
Inventor 刘玉环阮榕生高龙兰彭红张锦胜
Owner NANCHANG UNIV
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