Modified polyol and preparation method thereof, and modified polyurethane material and preparation method and application thereof

A polyurethane material and polyol technology, which is applied in the field of polyurethane composite materials, can solve the problems of reducing the thermal expansion of resin, reducing the mechanical properties of polyurethane and other resins, and not being environmentally friendly, so as to prevent the increase of resin fluidity, increase dispersion, and good fixation The effect of action

Active Publication Date: 2018-12-25
SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nanofiber materials such as nanocellulose and wood nanofibers with a certain length-to-diameter ratio are prepared by treating raw materials such as cellulose and lignocellulose, and these nanofiber materials can not only be used as reinforcing materials for resin composites, It can also reduce the thermal expansion of the resin, but due to the poor dispersion and easy agglomeration of nanocellulose in the resin matrix such as polyurethane, it will reduce the mechanical properties of resin such as polyurethane
[0004] CN101845146A discloses a formula and preparation method of enzymatic lignin-modified polyols, mixing polypolyol, glycerol, and acid catalyst formula evenly, adding enzymatic lignin to heat up the reaction, and then adding an alkali regulator to adjust the solution pH, then dialysis and vacuum distillation to obtain the product, which can be directly used in the synthesis of polyurethane. A large amount of chemical reagents are used in the preparation process, which is not environmentally friendly, and the preparation process is complicated; CN102731990A discloses a reinforced polyurethane imitation wood material and Its manufacturin

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  • Modified polyol and preparation method thereof, and modified polyurethane material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0062] Example 1

[0063] A modified polyurethane material dispersed with 0.1wt% micro-nano lignocellulose.

[0064] Among them, the length of the micro-nano lignocellulose is 2 μm, the diameter is 100 nm, and the aspect ratio is 200; and the micro-nano lignocellulose includes 20 wt% of lignin.

[0065] The preparation method is as follows:

[0066] (1) Add the micro / nano lignocellulose dispersion to the polyether polyol to make the mass percentage of the micro / nano lignocellulose 3wt%, and mix for 1h in a high-speed mixer at a stirring speed of 900r / min, then Rotary evaporation to remove the dispersing reagent to obtain a modified polyol; wherein the dispersing reagent is ethanol;

[0067] (2) Mixing the modified polyol with isocyanate to obtain a mixture;

[0068] (3) The base material is impregnated with the mixture, and then pultruded to form a modified polyurethane material.

Example Embodiment

[0069] Example 2-4

[0070] The only difference from Example 1 is that the modified polyurethane material provided in this example includes 0.01wt% of micro-nano lignocellulose (Example 2), 1wt% of micro-nano lignocellulose (Example 3) , 1.5wt% of micro-nano lignocellulose (Example 4).

Example Embodiment

[0071] Example 5-8

[0072] The only difference from embodiment 1 is that in this embodiment, the modified polyurethane material also includes graphene material, and the mass ratio of graphene material to micro-nano lignocellulose is 0.01:1 (embodiment 5), 0.1 :1 (Example 6), 0.5:1 (Example 7), 1:1 (Example 8);

[0073] Wherein, the way of adding the graphene material is: adding the micro-nano lignocellulose dispersion to the polyether polyol in step (1), and the graphene material does not contain graphene oxide;

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Abstract

The invention provides a modified polyol and a preparation method thereof, and a modified polyurethane material and preparation method and application thereof. The modified polyol includes a polyol matrix and micro-nano lignocellulose dispersed in the polyol matrix; the polyol matrix is selected from polyester polyol and/or polyester polyol. Micro-nano cellulose contained in the micro-nano lignocellulose provided herein has a large amount of hydroxyl radicals which may form binding sites with the polyol matrix; therefore, the micro-nano lignocellulose can be well dispersed in the polyol matrix, and the polyurethane material prepared with the polyol as a matrix is enhanced and toughened.

Description

technical field [0001] The invention belongs to the field of polyurethane composite materials, and relates to a modified polyol and a preparation method, a modified polyurethane material, a preparation method and an application. Background technique [0002] Polyurethane composite materials are very good materials in recent years. Due to the excellent elasticity of polyurethane resin, polyurethane fiber composite materials have far superior toughness to phenolic and epoxy resin substrates, but the performance of composite materials still needs further improvement. Improvement, polyol is one of the main raw materials for synthesizing polyurethane resin or polyurethane material, and the performance of polyurethane material can be further enhanced by modifying polyol or other raw materials. [0003] Nanocellulose has received more and more attention due to its wide range of sources and excellent properties. Nanofiber materials such as nanocellulose and wood nanofibers with a c...

Claims

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Application Information

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IPC IPC(8): C08G18/64C08K3/04
CPCC08G18/6484C08G18/6492C08K3/042
Inventor 任方华唐地源张金柱张安刘顶梁蒙蒙
Owner SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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