A composite foaming material with imitation pomelo peel structure and its preparation method

A technology of composite foaming and imitating grapefruit peel, applied in the field of functional materials, can solve the problems of reducing the impact strength of composite materials, obvious nucleation effect of additives, destroying the shape of cells, etc., to enhance mechanical properties, increase functional processing selectivity, The effect of increasing energy absorption capacity

Active Publication Date: 2022-06-28
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the mechanical properties of polyurethane foam materials are poor. Researchers have improved the mechanical properties of polyurethane rigid foams by adding nanoparticles (graphene, carbon nanotubes, silica), etc.
However, the hydrophilic and hydrophobic properties of additives and the added concentration have a great influence on the cell structure of polyurethane foam, and the nucleation effect of additives is obvious and the distribution is uneven, so that it will destroy the cell shape; short glass fiber is added to rigid polyurethane foam as a reinforcing material Among them, although it can increase the bending and tensile strength of the material, it usually reduces the impact strength of the composite material

Method used

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  • A composite foaming material with imitation pomelo peel structure and its preparation method
  • A composite foaming material with imitation pomelo peel structure and its preparation method
  • A composite foaming material with imitation pomelo peel structure and its preparation method

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preparation example Construction

[0020] The invention provides a preparation method (method for short) of an imitation pomelo peel structure composite foam material, which is characterized in that the method comprises the following steps:

[0021] Step 1. Mix the polyether polyol and isocyanate with a mechanical stirrer at a speed of 600-3000r / min for 5-30s, stir evenly, and quickly pour it into a foaming mold with an array structure mold; The surface is covered with fabric, and then covered with a foam mold cover to seal and foam for 12-24 hours, then cured, and demolded after curing to obtain a primary foam product;

[0022] The mass ratio of polyether polyol and isocyanate is 3-5:1;

[0023] The fabric adopts an areal density (gram weight) of 200-500g / m2 2 Nonwovens, carbon fiber cloths (carbon fabrics), woven fabrics or warp-knitted spacer fabrics; specifically nylon nonwovens, polyester nonwovens, carbon fiber cloths or double-sided polyester warp-knitted spacer fabrics;

[0024] The array structure mo...

Embodiment 1

[0032] Step 1. Mix the polyether polyol and isocyanate with a mass ratio of 4:1 with a mechanical stirrer at a speed of 1200r / min for 15s, stir evenly, and quickly pour into the foam with a cylindrical array structure mold with a diameter of 8mm. In the mold; after the pouring is completed, cover the surface with a layer of nylon non-woven fabric (area density is 300g / m 2 ), then cover the foaming mold cover plate to seal foaming for 12h, solidify, and demould after solidification to obtain a foamed product;

[0033] Step 2, place the side with the fabric of the primary foam product obtained in step 1 in the foaming mold as the bottom surface;

[0034] Step 3, with the polyether polyol and water (the quality of water is 2wt% of the polyether polyol quality) with a mechanical stirrer at a speed of 800r / min, stir and mix after 2min to obtain a mixture; The mass ratio is 4: The mixture of 1 and isocyanate are stirred at a speed of 1500 r / min with a mechanical stirrer, and after ...

Embodiment 2

[0036] Step 1. Mix and stir the polyether polyol and isocyanate with a mass ratio of 4:1 at a speed of 1200r / min for 15s, stir evenly, and quickly pour into the foam with a cylindrical array structure mold with a diameter of 12mm. In the mold; after the pouring is completed, cover the surface with a layer of nylon non-woven fabric (area density is 500g / m 2 ), then cover the foaming mold cover plate to seal foaming for 12h, solidify, and demould after solidification to obtain a foamed product;

[0037] Step 2, place the side with the fabric of the primary foam product obtained in step 1 in the foaming mold as the bottom surface;

[0038] Step 3. Stir and mix the polyether polyol, water and expanded vermiculite particles with a particle size of 30 μm (the mass of the water and the expanded vermiculite particles are both 2wt% of the mass of the polyether polyol) with a mechanical stirrer at a speed of 1000 r / min Stir well after 1.5min to obtain a mixture; stir the mixture with a...

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Abstract

The invention discloses a composite foaming material with imitation pomelo peel structure and a preparation method thereof. The method is: Step 1. Stir the polyether polyol and isocyanate evenly, and then pour it into a foaming mold with an array structure mould; Foaming, demoulding after curing to obtain a primary foaming product; step 2, placing the side of the primary foaming product obtained in step 1 with the fabric as the bottom surface in the foaming mold; step 3, mixing polyether polyol with water Stir evenly to obtain a mixture; stir the mixture and isocyanate evenly, and pour the mixture into the foaming mold in step 2; after the pouring is completed, cover the foaming mold cover plate to seal the foaming, and release the mold after curing to obtain a composite foaming material. Combining the array structure mould, textile material and porous material, the biomimetic pomelo skin structure composite material was prepared through the secondary foaming process, which improved the overall impact resistance and cushioning energy absorption effect.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a composite foaming material with an imitation pomelo peel structure and a preparation method thereof. Background technique [0002] At present, the mechanical properties of polyurethane foam materials are poor. Researchers have improved the mechanical properties of polyurethane rigid foams by adding nanoparticles (graphene, carbon nanotubes, silica), etc. However, the hydrophilic and hydrophobic properties of additives and the concentration of additives have a great influence on the cell structure of polyurethane foam, and the nucleation of additives is obvious and unevenly distributed, so that the cell morphology will be destroyed; short glass fibers are added as reinforcing materials to rigid polyurethane foams. Although it can improve the flexural and tensile strength of the material, it usually reduces the impact strength of the composite material. [0003] The more matu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/34C08G18/48C08K7/26C08K7/14C08K9/10C08J9/08C08G101/00
CPCC08J9/34C08G18/48C08K7/26C08K7/14C08K9/10C08G2110/0083
Inventor 李婷婷王宏阳林佳弘楼静文
Owner TIANJIN POLYTECHNIC UNIV
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