Method for preparing corncob-base polyurethane rigid foam damping material

A rigid foam and polyurethane technology, which is applied in the field of preparing corncob-based polyurethane rigid foam damping materials, can solve the problems of poor polyurethane foam performance, increased liquefaction cost, long liquefaction time, etc. short time effect

Inactive Publication Date: 2011-09-14
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem that liquefaction agents such as ethylene carbonate are decomposed into CO during the liquefaction process. 2 And volatilization and other reasons cause a lot of losses and increase the cost of liquefaction; the price of liquefaction agent polyethylene glycol 400 is relatively high; the concentration of concentrated sulfuric acid in the liquefaction catalyst corrodes equipment and pollutes the environment; Poor performance of polyurethane foam directly synthesized from alcohol

Method used

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  • Method for preparing corncob-base polyurethane rigid foam damping material
  • Method for preparing corncob-base polyurethane rigid foam damping material
  • Method for preparing corncob-base polyurethane rigid foam damping material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1, preparation corn cob base polyurethane rigid foam

[0032] Add 96 parts by weight of polyethylene glycol 400, 24 parts by weight of glycerol and 8.4 parts by weight of mass concentration of 72% sulfuric acid into the reaction vessel, stir evenly, heat up to 160 ° C, add 30 parts of crushed corn cobs (particle diameter 20-80 mesh), stirred and reacted for 60 minutes, and immediately cooled with cold water after taking it out to obtain a liquefied product.

[0033] Take out 100 parts by weight of the above liquefied product, add 1.5 parts by weight of magnesium oxide to neutralize excess acid, and then place it at 105° C. for 10 h to remove moisture. Take 50 parts by weight of the treated liquefied product in a paper cup, add 0.26 parts by weight of dibutyltin dilaurate, 0.24 parts by weight of triethylamine and 0.51 parts by weight of silicone oil, stir at 1300r / min for 60s, then add 50 parts by weight of The PAPI was stirred at the same speed for 30s (app...

Embodiment 2

[0035] Embodiment 2, preparation corncob base polyurethane rigid foam

[0036] Add 80 parts by weight of polyethylene glycol 400, 40 parts by weight of glycerol and 4.2 parts by weight of sulfuric acid with a concentration of 98% into the reaction vessel, stir evenly, heat up to 130° C., add 30 parts of crushed corncobs (particle diameter 20 -80 mesh), stirred and reacted for 60 minutes, and immediately cooled with cold water after taking out to obtain the liquefied product.

[0037] Take out 100 parts by weight of the above liquefied product, add 2 parts by weight of magnesium oxide to neutralize excess acid, and then place it at 105° C. for 12 hours to remove moisture. Take 50 parts by weight of the treated liquefied product in a paper cup, add 0.25 parts by weight of dibutyltin dilaurate, 0.26 parts by weight of triethylamine and 0.48 parts by weight of silicone oil, stir at 1200r / min for 60s, then add 50 parts by weight of The PAPI was stirred at the same speed for 20s (a...

Embodiment 3

[0039] Embodiment 3, preparation corn cob base polyurethane rigid foam

[0040] Add 12 parts by weight of polyethylene glycol 400, 108 parts by weight of glycerin and 4.2 parts by weight of sulfuric acid with a concentration of 98% into the reaction vessel, stir evenly, heat up to 160° C., add 30 parts of crushed corn cobs (particle diameter 20 -80 mesh), stirred and reacted for 60 minutes, and immediately cooled with cold water after taking out to obtain the liquefied product.

[0041]Take out 100 parts by weight of the above liquefied product, add 2 parts by weight of magnesium oxide to neutralize excess acid, and then place it at 105° C. for 11 hours to remove moisture. Take 50 parts by weight of the treated liquefied product in a paper cup, add 0.27 parts by weight of dibutyltin dilaurate, 0.24 parts by weight of triethylamine and 0.53 parts by weight of silicone oil, stir at 1000r / min for 60s, then add 50 parts by weight of The PAPI was stirred at the same speed for 60s ...

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Abstract

The invention discloses a method for preparing corncob-base polyurethane rigid foam damping material. The method includes the steps as follows: liquefying ground and screened corncobs by the mixed agent of polyethylene glycol 400 and glycerol to obtain a liquefied product; adding magnesium oxide to neutralize the liquefied product; and then allowing the liquefied product to polymerize with PAPI (polyphenylmethane polyisocyanate), thus forming the polyurethane rigid foam damping material. In the invention, renewable resources are utilized, the liquefying cost is lowered; the density of the synthesized polyurethane rigid foam damping material is adjustable within the range of 50-200kg / m3, the compressive strength achieves 100-2000kPa, the coefficient of heat conductivity is smaller than or equal to 0.050w / (m DEG C), the damping coefficient is greater than or equal to 0.3 and the temperature range is wide. The product has broad application prospect and remarkable environmental and social benefits.

Description

technical field [0001] The invention relates to a method for preparing a corncob-based polyurethane rigid foam damping material. Background technique [0002] As a class of polymer materials, polyurethane foam has been widely used in various fields such as transportation, construction, furniture and packaging because of its excellent specific strength, thermal properties and good processing performance. [0003] At present, the preparation of polyurethane foam is mainly obtained by polycondensation reaction of polyol and isocyanate obtained from petrochemical products. However, with the depletion of petroleum resources, the source of raw materials for the polyurethane industry has been seriously affected, thereby affecting the development of the polyurethane industry. [0004] Using cheap and easy-to-get renewable energy such as biomass as a raw material, after liquefaction under certain technical conditions, a liquid substance containing hydroxyl groups is obtained, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/64C08H7/00C08G101/00
Inventor 李栋刘玉先汪立君毛志怀魏青
Owner CHINA AGRI UNIV
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