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Method for preparing silica/lignin type polyurethane foam material

A technology of polyurethane foam and silicon dioxide is applied in the field of preparing silicon dioxide/lignin type polyurethane foam material, which can solve the problems of high ash content of rice husk, non-combustibility, limited application and the like

Inactive Publication Date: 2014-03-26
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rice husk has the characteristics of high ash content and non-combustibility, which limits its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. Experimental study on the separation of liquefied rice husks

[0014] First, put the rice husk and 5% sodium hydroxide solution into a 500mL three-necked flask with a stirring device, mix the rice husk and the solution at a mass ratio of 1:12, boil at normal pressure for 8 hours, and filter and separate The residue and filtrate of the rice husk, the filter residue is washed with deionized water until neutral, and dried at 120°C as raw material for carbonization.

[0015] 2. In situ preparation of rice husk-based lignin / silica composites by sol-gel method

[0016] Put the filtrate separated from the rice husk into a 500mL three-neck flask with a stirring device, the contact temperature was 130°C, and the mixture was mixed with 0.5mol / L H 2 Titrate the filtrate with SO4 solution, titrate while stirring, and react at 130°C for 8 hours to form a sol system. liquid separation. The solid was repeatedly washed with deionized water until neutral, and dried at 120°C to obt...

Embodiment 2

[0018] Example 2: The amount of rice husk-based lignin / silicon dioxide was changed to 1 g, and the other steps were the same as in Example 1. The foaming time of the silicon dioxide / lignin type polyurethane foam material was 3min34s, and the foaming ratio was 29 times.

Embodiment 3

[0019] Example 3: The lignin / silicon dioxide obtained by changing the neutralization pH to 5 was added to the polyurethane, and the other steps were the same as in Example 1 to obtain a lignin-type polyurethane foam with a foaming time of 3min36s and a foaming ratio of 22 times.

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Abstract

The invention discloses a method for preparing a silica / lignin type polyurethane foam material. The method comprises: utilizing lignin in rice husks and silica to prepare a uniform lignin / silica nanocomposite material with good dispersibility by employing a sol-gel method, then employing a one-step foaming method to ultrasonically disperse and dissolve the lignin / silica nanocomposite material in polyether polyol, and finally compounding with raw materials such as isocyanate and the like to obtain the silica / lignin type polyurethane foam material. The employed uniform lignin / silica nanocomposite material is cheap and easily available; the whole preparation process is simple in technology, green and environment-friendly; and the method not only helps to reduce the cost of polyurethane foam products, but also helps to change waste into values, reduce environment pollution and the like, and has important meaning.

Description

technical field [0001] The invention relates to a method for preparing silica / lignin type polyurethane foam material, in particular to preparing lignin / silicon dioxide composite by using rice husk, and then synthesizing silica / lignin type polyurethane foam through a one-step foaming process material method. Background technique [0002] Polyurethane foaming material is made of polyether polyol and isocyanate as reactants, foaming agent, catalyst and foam stabilizer, etc. in the presence of polycondensation and foaming. With the rapid development of the economy, people have higher and higher requirements for the environmental protection performance of materials. The use of natural polymer substances to replace part of polyether polyols has attracted more and more attention. [80] . Due to its excellent physical and mechanical properties, polyurethane is widely used in various fields of life. Lignin is a natural polymer material, because its structure is rich in a large numb...

Claims

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Application Information

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IPC IPC(8): C08G18/64C08G18/48C08K3/36C08J9/08C08J9/14C08G101/00
CPCC08G18/4081C08G18/48C08G18/6492C08G2101/00C08J9/141C08J2203/14C08J2375/08C08K3/36C08G2110/0083
Inventor 曲玉宁
Owner TIANJIN POLYTECHNIC UNIV
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