Non-covalently bonding anti-microbial nanoparticles for water soluble wood treatment

A nanoparticle and wood treatment technology, applied in the fields of treating wood products, preparing coated nanoparticles, wood treatment compositions, wood products, wood and wood products, can solve the problem of easy leaching, reduce the efficacy of water-borne preservatives, and increase anti-corrosion heavy metal toxicity

Inactive Publication Date: 2014-06-04
EMPIRE TECH DEV LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Waterborne preservatives are usually easy to apply, but leaching reduces the efficacy of the waterborne preservative and increases the environmental / safety burden
For example, boron-based waterborne preservatives are cheap and effective, but are prone to leaching, and some boron preservatives are only evaluated for very narrow uses
Chromates, commonly used in wood preservatives, provide longer retention; however, chromates increase the preservative's heavy metal toxicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Zinc oxide nanoparticle core coated with xyloglucan

[0040] Zn(Ac) can be 2 h 2 O was dissolved in a solution of 200ml methanol and 6ml distilled water. Nitrogen can be introduced into the mixture for about 20 minutes and the solution can be stirred for 2 hours under an inert atmosphere. Purified xyloglucan can then be added to the mixture and stirring can be continued overnight in an inert environment. The solution can be filtered to remove the resulting coated nanoparticles from the solution, and the filtered nanoparticles can be washed in methanol and filtered again. The washing and filtering steps can be repeated as needed. The filtered coated nanoparticles can be dried in a dehydrator to produce a powder of ZnO nanoparticle cores coated with xyloglucan.

Embodiment 2

[0041] Example 2: Zinc oxide nanoparticle core coated with lignin

[0042] Zn(Ac) can be 2 h 2 O was dissolved in a solution of 200ml methanol and 6ml distilled water. Nitrogen can be introduced into the mixture for about 20 minutes and the solution can be stirred for 2 hours under an inert atmosphere. Purified lignin can then be added to the mixture and stirring can be continued overnight in an inert environment. The solution can be filtered to remove the resulting coated nanoparticles from the solution, and the filtered nanoparticles can be washed in methanol and filtered again. The washing and filtering steps can be repeated as needed. The filtered coated nanoparticles can be dried in a dehydrator to produce a powder of lignin-coated ZnO nanoparticle cores.

Embodiment 3

[0043] Example 3: Zinc Oxide Nanoparticle Cores Coated with Complex Mixtures

[0044] Zn(Ac) can be 2 h 2 O was dissolved in a solution of 200ml methanol and 6ml distilled water. Nitrogen can be introduced into the mixture for about 20 minutes and the solution can be stirred for 2 hours under an inert atmosphere. A mixture of wood components comprising cellulose, hemicellulose and lignin prepared by enzymatic treatment of dry sawdust can then be added to the mixture and stirring can be continued overnight in an inert environment. The solution can be filtered to remove the resulting coated nanoparticles from the solution, and the filtered nanoparticles can be washed in methanol and filtered again. The washing and filtering steps can be repeated as needed. The filtered coated nanoparticles can be dried in a dehydrator to produce a powder of ZnO nanoparticle cores coated with a mixture of wood components.

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PUM

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Abstract

Embodiments described herein include capped nanoparticles having a nanoparticle core and at least one capping agent including a biochemical constituent of wood or a woody plant or a derivative thereof functionally associated to the nanoparticle core. Some embodiments provide for wood products and wood treatment compositions including such capped nanoparticles, and methods for preparing and using such capped nanoparticles to produce treated wood or treated wood products.

Description

Background technique [0001] Wood is degraded by microorganisms, especially fungi and bacteria, which promote degradation by creating environmental conditions that favor further decay or consumption by larger organisms such as insects or marine borers. Wood preservation methods attempt to prevent degradation by these microorganisms. Existing and near-term wood preservation technologies are subject to limitations such as wood treatment capabilities, broad-spectrum efficacy, affordability, and environmental safety / human toxicity. For example, some of the most effective treatments use arsenic-containing compounds such as chromated copper arsenate (CCA), which are no longer applicable in many parts of the world due to potential toxicity / environmental concerns. Additionally, certain fungi have developed resistance to copper compounds. [0002] Wood preservatives are traditionally divided into oil-borne and water-borne according to the type of solvent used. Waterborne preservative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D3/02C09D7/62
CPCC09D7/1275C09D7/1266C09D101/02C09D7/1225C09D15/00C09D105/00C09D197/005B27K3/007C09D5/14C09D5/1618C09D105/06B82Y5/00C09D105/14C09D7/62C09D7/67C09D7/68Y10T428/2991Y10T428/662Y10T428/31989Y10T428/4935
Inventor S-W·陈
Owner EMPIRE TECH DEV LLC
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