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Degradable polyurethane foam material made from straw and preparation thereof

A technology of polyurethane foam and wheat straw, which is applied in the field of degradable polyurethane foam and its preparation, to achieve good thermal insulation performance, broad application prospects, and significant environmental benefits

Inactive Publication Date: 2008-10-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the plant fiber raw materials used for polyurethane synthesis mainly include black wattle bark, tannin, etc., and the degradable polyurethane materials using wheat straw as raw materials have not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) The wheat straw is crushed and sieved into fibers of 45-100 meshes, and dried at 105°C to constant weight to obtain fiber A;

[0016] 2) Process fiber A with the microwave-ethanol method, that is, use 40% (volume ratio of ethanol to water) ethanol aqueous solution as the extractant, and the liquid-solid ratio is 10:1 (mass ratio, the same below), and continuously heat and reflux in a microwave oven 10min, filtered, dried to obtain fiber B;

[0017] 3) mixing 90% polyethylene glycol and 10% ethylene glycol to prepare a liquefaction reagent;

[0018] 4) Fiber B is mixed with 5 times the mass of the liquefaction reagent and 3% (by mass ratio of fiber B) sulfuric acid catalyst, continuously stirred and heated at 150° C. for 1 hour, and water-cooled to terminate the reaction to obtain the liquefied polyol;

[0019] 5) Mix and stir the liquefied polyol and 1% triethylenediamine, 1% dibutyltin laurate, 0.1% silicone oil and 1% water as a foaming agent, and calculate accord...

Embodiment 2

[0021] 1) The wheat straw is crushed and sieved into fibers of 45-100 meshes, and dried at 105°C to constant weight to obtain fiber A;

[0022] 2) Process fiber A with the microwave-ethanol method, that is, use 60% (volume ratio of ethanol to water) ethanol aqueous solution as the extractant, and the liquid-solid ratio is 10:1 (mass ratio, the same below), and continuously heat and reflux in a microwave oven 30min, filtered, dried to obtain fiber B;

[0023] 3) Mix 60% polyethylene glycol and 40% ethylene glycol to make a liquefaction reagent;

[0024] 4) Fiber B was mixed with 5 times the mass of liquefaction reagent and 1% (mass ratio to fiber B) sulfuric acid catalyst, stirred and heated continuously at 180° C. for 1 h, and water cooled to terminate the reaction to obtain liquefied polyol.

[0025] 5) Mix the liquefied polyol with 3% triethylenediamine, 3% stannous octoate, 0.4% silicone oil and 3% water as a foaming agent and stir evenly, and add diisocyanate according to...

Embodiment 3

[0027] 1) The wheat straw is crushed and sieved into fibers of 45-100 meshes, and dried at 105°C to constant weight to obtain fiber A;

[0028] 2) Process fiber A with the microwave-ethanol method, that is, use 50% (volume ratio of ethanol to water) ethanol aqueous solution as the extractant, and the liquid-solid ratio is 10:1 (mass ratio, the same below), and continuously heat and reflux in a microwave oven 30min, filtered, dried to obtain fiber B;

[0029] 3) Mix 80% polyethylene glycol and 20% ethylene glycol to make a liquefaction reagent;

[0030] 4) Fiber B was mixed with 5 times the mass of liquefaction reagent and 2% (mass ratio to fiber B) sulfuric acid catalyst, continuously stirred and heated at 160° C. for 1 h, water cooled to terminate the reaction, and liquefied polyol was obtained.

[0031] 5) Mix the liquefied polyol with 2% triethylenediamine, 2% dibutyltin laurate, 0.2% silicone oil and 2% water as a foaming agent and stir evenly, and calculate according to ...

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Abstract

The invention relates to polyurethane foam material based on wheat straw as raw material, and the preparation method. The wheat straw as raw material is treated through liquefaction to obtain liquefied polyol which is then polymerized with di-isocyanate to form degraded polyurethane foam material. The material has good compressive strength, good insulation performance, non-polluting production process and biodegradable waste products, which will not cause harm to the environment. The material can be widely used as heat insulation material for buildings, watercrafts and refrigerators and has broad application prospect, which also has significant environmental benefits, economic benefits and social environment benefits.

Description

technical field [0001] The invention relates to the technical field of molecular materials, in particular to a degradable polyurethane foam material using wheat straw as a raw material and a preparation method thereof. Background technique [0002] Synthetic polymer materials have become an important part of the national economy and people's lives. The negative effect is that while consuming increasingly depleted petroleum resources, a large amount of waste that is difficult to handle is produced, which brings harm to the environment on which human beings depend. . Replacing petroleum resources with renewable waste plant raw materials and producing environmentally degradable polymer materials is one of the effective ways to solve the problem. [0003] Polyurethane (PU) has become one of the fastest growing varieties in the modern plastics industry due to its low price and superior performance. The basic reaction is the polycondensation reaction between isocyanate and polyo...

Claims

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Application Information

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IPC IPC(8): C08G18/32C08G18/08C08G101/00
Inventor 陈秋玲孙可伟李如燕
Owner KUNMING UNIV OF SCI & TECH
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