Pomelo peel-like structured composite foaming material and preparation method thereof

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: 2019-08-30
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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  • Pomelo peel-like structured composite foaming material and preparation method thereof
  • Pomelo peel-like structured composite foaming material and preparation method thereof
  • Pomelo peel-like structured composite foaming material and preparation method thereof

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preparation example Construction

[0020] The invention provides a kind of preparation method (abbreviation method) of composite foaming material of imitation pomelo peel structure, it is characterized in that the method comprises the 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; Its surface is covered with fabric, and then covered with a foaming mold cover plate to seal the foaming for 12-24 hours, then solidified, and demoulded after solidified to obtain a primary foamed product;

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

[0023] Described fabric adopts surface density (gram weight) to be 200-500g / m 2 non-woven fabric, carbon fiber cloth (carbon fabric), woven fabric or warp-knitted spacer fabric; specifically, nylon non-woven fabric, polyester non-woven fabric, carbon fiber cloth or double-sided polyester warp-knitted ...

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, then stir evenly, and quickly pour it into a foaming mold with a cylindrical array structure mold with a diameter of 8mm. In the mould; after pouring is finished, cover one deck nylon non-woven fabric on its surface (area density is 300g / m 2 ), then cover the foaming mold cover plate and seal the foaming for 12 hours, solidify, demould after curing, and obtain a foamed product;

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

[0034] Step 3, polyether polyol and water (the quality of water is the 2wt% of polyether polyol quality) with mechanical stirrer with the speed of 800r / min stirring after mixing 2min, obtain mixture; Mass ratio is 4: Stir the mixture of 1 and isocyanate with a mechanical stirrer at a speed of 1500r / min, stir evenly after sti...

Embodiment 2

[0036] 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, then stir evenly, and quickly pour it into a foaming mold with a cylindrical array structure mold with a diameter of 12mm. In the mould; after the pouring is completed, one deck of nylon non-woven fabric (area density is 500g / m2) is covered on its surface 2 ), then cover the foaming mold cover plate and seal the foaming for 12 hours, solidify, demould after curing, and obtain a foamed product;

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

[0038] Step 3, polyether polyol, water and particle diameter 30 μm expanded vermiculite particles (the quality of water and expanded vermiculite particle is 2wt% of polyether polyol quality) with mechanical stirrer with the speed of 1000r / min mixing Stir evenly after 1.5min to obtain a mixture; stir the mixtu...

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Abstract

The invention discloses a pomelo peel-like structured composite foaming material and a preparation method thereof. The preparation method comprises the following steps: 1, uniformly stirring polyetherpolyol and isocyanate, and pouring the mixture into a foaming mold with an array structure mold; after the mixture is completely poured into the foaming mold, covering the surface of the mixture by afabric, covering the foaming mold by a cover plate, conducting sealed foaming, and conducting demolding after curing so as to obtain a primary foaming product; 2, putting the primary foaming productobtained in the step 1 into the foaming mold in a manner of taking one side with the fabric as a bottom surface; and 3, uniformly stirring the polyether polyol with water so as to obtain a mixture, uniformly stirring the mixture with the isocyanate, pouring the mixture into the foaming mold of the step 2, after the mixture is completely poured into the foaming mold, covering the foaming mold by the cover plate, conducting sealed foaming, and conducting demolding after curing, so as to obtain the composite foaming material. The array structure mold, a fabric material and a porous material are combined, the pomelo peel-like structured composite foaming material is prepared by using a twice foaming process, and the overall impact resistance and the buffer and energy absorption effect can be improved.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a composite foaming material with 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 added concentration have a great influence on the polyurethane foam cell structure, and the additive nucleation effect 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 the bending and tensile strength of the material can be improved, the impact strength of the composite material is usually reduced. [0003] Ripe grapefruit...

Claims

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Application Information

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Patent Type & Authority Applications(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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