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Multi-layer flexible damping sandwich material and preparation method thereof

A sandwich material and flexible buffer technology, applied in the field of textile composite materials, can solve the problems of soft polyurethane volume limitation, reduced shear thickening effect, inability to achieve protective effect, etc., to improve shear toughness and resistance to sharp objects tearing. cracking ability, excellent statics and shape retention properties, and excellent energy absorption and buffering effect

Active Publication Date: 2017-12-01
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Soft polyurethane is limited by its volume and has limited impact resistance
A thick polyurethane layer must be added to ensure a certain amount of cushioning and energy absorption. It is difficult to ensure the size of the cushioning material, and its shear toughness is poor, which is easy to cause tear damage;
[0007] 2. Since the shear thickening fluid is fluid in normal state, it is difficult to be fixed inside the protective material for a long time due to the influence of gravity, and problems such as liquid leakage also affect the long-term use of the protective material
[0008] 3. The shear thickening fluid has a unique shear thickening effect. The common method is to soak the fabric in the shear thickening fluid, but there are two problems in the specific use: 1. People cannot wear it in a wet state; 2. .The shear thickening effect is reduced in the dry state, and the protective effect cannot be achieved

Method used

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  • Multi-layer flexible damping sandwich material and preparation method thereof
  • Multi-layer flexible damping sandwich material and preparation method thereof
  • Multi-layer flexible damping sandwich material and preparation method thereof

Examples

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preparation example Construction

[0043] The present invention simultaneously provides a kind of preparation method (abbreviation method) of multi-layer flexible cushioning sandwich material, it is characterized in that this method comprises the following steps:

[0044] A. Preparation of shear thickening fluid:

[0045] (1) Calculate the total mass of the shear thickening fluid according to the volume of the buffer zone;

[0046] (2) drying the nano-silica with a quality of 12-45% of the total mass of the shear thickening fluid in a vacuum drying oven to remove moisture;

[0047] (3) Weigh polyethylene glycol, and slowly add nano-silica to polyethylene glycol at a stirring speed of 300-500r / min; specifically, the nano-silica to be added is completely dispersed in polyethylene glycol , and then continue nano-silica until the addition is complete; the entire stirring time is 5h-6h;

[0048] (4) In order to ensure that the shear thickening fluid can be dispersed evenly, the prepared shear thickening fluid is u...

Embodiment 1

[0058] Multi-layer flexible cushioning sandwich material: the volume of the cushioning area accounts for 13% of the entire material volume; the specification of the structural support layer 2 is 350mm×330mm×30mm; the buffer unit 1 is rectangular, the size is 20mm×20mm, and the depth is 10mm. The interval between the units 1 is 10mm; the covering protection layer 3 is made of fabric and placed on the upper and lower sides of the structural support layer. The particle size of nano-silica is 12nm; the foaming density is 0.18g / cm 2 , The overall thickness of the material is 30mm.

[0059] The preparation method of the multi-layer flexible cushioning sandwich material, the specific steps are as follows:

[0060] A. Preparation of shear thickening fluid:

[0061] (1) Calculate the total mass of the shear thickening fluid according to the volume of the buffer zone to be 500g;

[0062] (2) 90g of nano silicon dioxide is dried in a vacuum oven to remove moisture;

[0063] (3) Take ...

Embodiment 2

[0071] Multi-layer flexible cushioning sandwich material: the volume of the cushioning area accounts for 15% of the entire material volume; the specification of the structural support layer 2 is 350mm×330mm×30mm; the cushioning unit 1 is circular, with a diameter of 20mm and a depth of 10mm. 1 with an interval of 10 mm; the covering protection layer 3 is made of fabric and placed on the upper and lower sides of the structural support layer. The particle size of nano-silica is 12nm; the foaming density is 0.18g / cm 2 , The overall thickness of the material is 30mm.

[0072] The preparation method is the same as in Example 1.

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Abstract

The invention discloses a multi-layer flexible damping sandwich material and a preparation method thereof. The material comprises a structure supporting layer and a cover protecting layer, wherein the structure supporting layer is formed by a structure supporting layer main body and a structure supporting layer cap, and has a soft polyurethane foaming structure formed by twice foaming in one-step; the structure supporting layer main body is formed in first foaming, and a damping region is formed inside the structure supporting layer; the damping region is distributed inside the structure supporting layer by a plurality of damping units according to a certain formation mode; each damping unit is filled with a shear thickening fluid; the structure supporting layer cap is formed in second foaming, and the structure supporting layer cap and the structure supporting layer main body are combined to form the structure supporting layer in the foaming process; and the cover protecting layer is one or more blended fabric obtained by using natural fibers or synthetic fibers, and is put on upper and lower faces of the structure supporting layer by a hot-press mode. The material has excellent protecting and damping performance, and has light, convenient, comfortable and flexible characteristics.

Description

technical field [0001] The invention relates to the field of textile composite materials, in particular to a multi-layer flexible buffer sandwich material and a preparation method thereof. Background technique [0002] The development of science and technology has improved the living standards of human beings, which has also prompted people to put forward higher performance requirements for protective materials. At present, protective materials mainly include: 1. Hard materials, mainly high-strength and high-quality metals (such as aluminum alloys, titanium-magnesium alloys, etc.) or high-rolled alloy materials. 2. Soft materials, such as polyurethane foam materials, high-performance fibers (such as Kevlar) fabrics. 3. Non-metallic composite materials, this type of protective material is based on high-performance fiber fabrics, and the fibers are subjected to secondary treatment, such as coating or impregnation with shear thickening fluid treatment, and then the excess liqu...

Claims

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Application Information

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IPC IPC(8): B32B5/02B32B27/12B32B27/40B32B3/08C08G18/48C08K3/36C08L71/02C08G101/00
CPCC08G18/48C08K3/36B32B3/085B32B5/02B32B27/12B32B27/40C08G2101/00C08L71/02
Inventor 吴利伟王晶姜茜林佳弘楼静文李婷婷彭浩凯
Owner TIANJIN POLYTECHNIC UNIV
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