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Crosslinked starch reinforced composite shear thickening elastomer

A technology of cross-linked starch and reinforced composite, which is applied in the direction of synthetic resin layered products, protective equipment, clothing, etc.

Active Publication Date: 2021-07-06
广州无塑地球新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned problems existing in the prior art, the present invention forms a polymer network structure by compounding cross-linked starch and shear thickening glue, which solves the cold flow problem of the original shear thickening material, and at the same time It has better processability, initial elastic modulus and elastic recovery ability, which is conducive to maintaining the overall protective performance without attenuation during long-term use

Method used

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  • Crosslinked starch reinforced composite shear thickening elastomer
  • Crosslinked starch reinforced composite shear thickening elastomer
  • Crosslinked starch reinforced composite shear thickening elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1: A cross-linked starch reinforced composite shear thickening glue

[0054] A kind of preparation method of cross-linked starch reinforced composite shear thickening glue, described preparation method comprises the steps:

[0055] (1) Take 100 parts of dry starch, add 100 parts of deionized water, stir and dissolve to make starch milk. Add 10 parts of 50% glutaraldehyde to the starch milk and stir evenly. Stir mechanically for 5 hours under the condition of heating in a water bath at 40° C. to obtain uniform starch milk. The obtained starch milk is vacuum filtered, washed with cold water for 2 to 3 times, and dried at 50°C to obtain the glutaraldehyde crosslinked starch product.

[0056] (2) Dehydrate boric acid at 160°C for 2 hours, then add 1 part of boric acid to 80 parts of 2000cst polydimethylsiloxane, and mix it mechanically at 160°C for 2 hours to obtain a shear thickening gel ;

[0057] (3) Put glutaraldehyde cross-linked starch and shear thickening...

Embodiment 2

[0065] The method for preparing crosslinked starch with reference to embodiment 1 strengthens composite shear thickening glue, and difference is only, the mass ratio of glutaraldehyde crosslinking starch in embodiment 1, shear thickening glue is adjusted to 2:8,3: 7. 4:6, 5:5, 6:4, other conditions are the same as in Example 1. For the convenience of subsequent comparison, they are numbered as Example 2a, Example 2b, Example 2c, Example 2d, and Example 2e.

[0066] Table 1

[0067]

[0068] The modulus and energy absorption properties of starch-reinforced composite shear-thickening glue were determined by using the stress-strain mode and large oscillation mode of the rheometer. The larger the modulus of the sample, the higher the stress it can get when it is subjected to external force, so as to achieve better protection effect. The larger the area covered by the hysteresis curve, the stronger its energy dissipation capability, and correspondingly, it can dissipate more e...

Embodiment 3

[0071] A kind of preparation method of crosslinked starch reinforced composite shear thickening elastomer, described preparation method comprises the steps:

[0072] (1) Preparation of glutaraldehyde cross-linked starch: Take 100 parts of dry starch, add 100 parts of deionized water, stir and dissolve to make starch milk. Add 10 parts of 50% glutaraldehyde to the starch milk and stir evenly. Stir mechanically for 5 hours under the condition of heating in a water bath at 40° C. to obtain uniform starch milk. The obtained starch milk is vacuum filtered, washed with cold water for 2 to 3 times, and dried at 50°C to obtain the glutaraldehyde crosslinked starch product.

[0073] (2) Preparation of shear thickening glue: dehydrate boric acid at 160°C for 2 hours, then add 1 part of boric acid to 80 parts of 2000cst polydimethylsiloxane, and mix it by mechanical stirring for 3 hours at 160°C , to obtain a shear thickening glue;

[0074] (3) Prepare shear thickening elastomer: the ...

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Abstract

The invention discloses a crosslinked starch reinforced composite shear thickening elastomer, and belongs to the technical field of composite material preparation. The crosslinked starch and the shear thickening glue are compounded to form a macromolecular network structure, so that the problem of cold flow property of the original shear thickening material is solved, meanwhile, the shear thickening material has better machinability, initial elastic modulus and elastic recovery capability; and the overall protection performance can be kept without attenuation in the long-time use process. The shear thickening elastomer prepared by the preparation method disclosed by the invention not only keeps good impact resistance, but also has excellent stability (namely no cold flow property). In the actual application process, the material serves as a core material and is easy to package, and when a plane material is damaged and loses sealing performance, the shear thickening elastomer does not leak like shear thickening glue.

Description

technical field [0001] The invention relates to a cross-linked starch-reinforced composite shear-thickening elastomer, which belongs to the technical field of composite material preparation. Background technique [0002] With the improvement of people's safety awareness, the market of protective cushioning materials is expanding day by day. Various protective materials based on shear thickening fluid (Shear thickening Fluid, STF) and shear thickening gel (Shear thickening Gel, STG) are due to their light weight, The characteristics of good protective performance have attracted more and more attention from researchers; shear thickening reinforced materials are in a liquid-like state at low shear rates, and their viscosity increases sharply under high dynamic loads to appear in a solid-like state, and their impact resistance and damping properties are excellent. Increase. At present, the most widely used and researched is the shear thickening fluid, but it has inherent defect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L3/04C08K3/38C08J3/24D06M15/11D06M15/643D06M11/82B32B27/28B32B27/20B32B27/18B32B27/12B32B5/02B32B33/00
CPCC08L83/04C08L3/04C08J3/246D06M15/11D06M15/643D06M11/82B32B27/283B32B27/20B32B27/18B32B27/12B32B5/02B32B33/00C08J2383/04C08J2403/04C08J2303/04C08J2483/04B32B2571/00C08K3/38
Inventor 徐进周家星袁久刚范雪荣高卫东
Owner 广州无塑地球新材料科技有限公司
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