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Lignin/halloysite nano hybrid material and preparation method thereof and application of lignin/halloysite nano hybrid material in phenolic foam thermal insulation material

A lignin and nanotechnology, applied in the field of thermal insulation materials, can solve the problems of easy wear and brittleness of the surface, and achieve the effects of improving mechanics, improving dispersion and improving stability

Pending Publication Date: 2022-01-28
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phenolic foam has the characteristics of high brittleness and easy wear on the surface. In the foam preparation process, reinforcing or toughening components can be introduced to improve the mechanical properties of phenolic foam. The introduction of organic components with flexible groups such as cardanol can improve the performance of phenolic foam. However, the hardness and flame retardancy of the phenolic foam are sacrificed to a certain extent, and the uniform dispersion of nanomaterials in the phenolic foam can improve the mechanical strength of the phenolic foam while maintaining the flame retardancy of the phenolic foam. However, how to The realization of nanoscale dispersion of nanomaterials has always been a key problem to be solved

Method used

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  • Lignin/halloysite nano hybrid material and preparation method thereof and application of lignin/halloysite nano hybrid material in phenolic foam thermal insulation material
  • Lignin/halloysite nano hybrid material and preparation method thereof and application of lignin/halloysite nano hybrid material in phenolic foam thermal insulation material
  • Lignin/halloysite nano hybrid material and preparation method thereof and application of lignin/halloysite nano hybrid material in phenolic foam thermal insulation material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Dissolving 10 parts of herbal lignin in 100 parts of N,N-dimethylformamide, adding 34 parts of 48% hydrobromic acid aqueous solution and 0.2 part of cetyltrimethylammonium bromide, Stir the reaction at 90°C for 1.5h, cool to room temperature after the reaction, add water to precipitate the precipitate, centrifuge and wash the precipitate with water to obtain demethylated herbal lignin;

[0054] (2) Dissolve 10 parts of demethylated herbal lignin in 100 parts of organic solvent, add 7.5 parts of halloysite, stir and react at 50°C for 24 hours, cool to room temperature after the reaction, centrifuge and wash the precipitate with water, The herbaceous lignin / halloysite nano-hybrid material is obtained.

Embodiment 2

[0056] (1) Dissolving 10 parts of hardwood lignin in 100 parts of N,N-dimethylformamide, adding 34 parts of 48% hydrobromic acid aqueous solution and 0.2 part of cetyltrimethylammonium bromide, Stir the reaction at 90°C for 1.5h, cool to room temperature after the reaction, add water to precipitate the precipitate, centrifuge and wash the precipitate with water to obtain demethylated hardwood lignin;

[0057] (2) Dissolve 10 parts of demethylated hardwood lignin in 100 parts of organic solvent, add 7.5 parts of halloysite, stir and react at 50°C for 24 hours, cool to room temperature after the reaction, centrifuge and wash the precipitate with water, A hardwood lignin / halloysite nano-hybrid material was obtained.

[0058] Through nuclear magnetic resonance analysis, the demethylation rate of lignin in the lignin / halloysite nano-hybrid material that embodiment 1 and embodiment 2 obtains is respectively 21.4% and 13.7%, and the content of phenolic hydroxyl group is lower than th...

Embodiment 3

[0060] (1) Add 30 parts of water, 3.3 parts of NaOH, 27.15 parts of paraformaldehyde, and 0.4 parts of herbal lignin / halloysite nano-hybrid material to 100 parts of phenol, and stir and react at 70°C for 0.5h;

[0061] (2) Further add 27.15 parts of paraformaldehyde in two times, stir and react at 90°C for 1 hour, then lower the temperature to 70°C and stir for 0.5 hour, and obtain phenolic resin after cooling;

[0062] (3) Add 3.5 parts of surfactant DC-193, 8 parts of n-pentane, and 20 parts of p-toluenesulfonic acid to 100 parts of phenolic resin. ℃, the time is 1.25h, and the phenolic foam insulation material is obtained.

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Abstract

The invention discloses a lignin / halloysite nano hybrid material and a preparation method thereof and an application of the lignin / halloysite nano hybrid material in a phenolic foam thermal insulation material, wherein the lignin / halloysite nano hybrid material is a nano tubular structure formed by demethylated lignin coated halloysite, the tube length is 0.5-5 [mu]m, and the tube outer diameter is 20-100 nm. According to the invention, a lignin / halloysite nano hybrid material is prepared by activating lignin and modifying halloysite nanotubes, can be used for in-situ preparation of a phenolic foam thermal insulation material, has excellent compatibility and reactivity with a phenolic foam matrix, and effectively improves mechanical, thermal insulation and flame retardant properties of phenolic foam.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, and in particular relates to a lignin / halloysite nano-hybrid material, a preparation method thereof and an application in phenolic foam thermal insulation materials. Background technique [0002] Phenolic foam is a general-purpose rigid foam plastic. Its most prominent features are flame retardant, low smoke and high temperature creep resistance. It also has excellent barrier properties, corrosion resistance, high modulus, light weight, and convenient construction. And other advantages, as thermal insulation materials have been widely used in construction, mining, petrochemical, vehicle and ship, aerospace industry and other fields. The preparation of phenolic foam usually includes two steps. The first step is the synthesis of phenolic resin, which is to catalyze the polycondensation of phenol and formaldehyde under alkaline conditions to obtain a resole phenolic resin with suitable vi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K7/26C08G8/08C08G8/10C08L61/06C08J9/14
CPCC08K9/10C08K7/26C08G8/08C08G8/10C08J9/141C08J9/009C08K2201/011C08J2361/06C08J2203/14
Inventor 应汉杰李明朱晨杰胡有钦庄伟沈涛谭卓涛
Owner NANJING UNIV OF TECH