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Process for the acetylation of wood elements

A technology for acetylation, wood, applied in the field of acetylation for wood parts, which can solve problems such as poor durability

Active Publication Date: 2012-12-12
TITAN WOOD LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Existing panels also showed poorer durability when tested against bioerosion compared to panels made from acetylated wood elements

Method used

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  • Process for the acetylation of wood elements
  • Process for the acetylation of wood elements
  • Process for the acetylation of wood elements

Examples

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Embodiment Construction

[0026] In an embodiment of the method of the invention, wood chips (approximately 40mm x 40mm x 10mm) originating from spruce and having a moisture content of 4 wt% to 10 wt% are placed in wire mesh walled baskets Medium (to allow easy passage of fluids) and placed in a pressure reactor. A vacuum of -0.95 bar was then applied to the chips for 5 minutes. Then, a preheated acetylation fluid at 130°C (comprising a mixture of 95% acetic anhydride and 5% acetic acid) was introduced into the reactor, which was subjected to a pressure of 10 bar for 10 minutes. The reactor was then drained and the wood chips were exposed to circulating nitrogen heated to 145°C for 60 minutes. During this part of the process, the pressure in the reactor may rise to 1 to 2 bar. After the pressure has been released, the acetylated wood chips are vacuum dried at -0.92 bar and cooled for 5 to 10 hours, usually 6-7 hours in total (ie drying and cooling). The level of acetylation was about 20% of the acet...

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PUM

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Abstract

A composite wood product containing acetylated wood elements characterised by an average value in thickness swelling not exceeding 5% after subjection to 25 wet- dry / freeze-thaw cycles as described in Table II. Alternative characterisations include moduli of elasticity and rupture, and bending strength. A two stage process for the acetylation of wood elements is also described.

Description

technical field [0001] The present invention relates to undecorated or decorated boards and / or moldings, and in particular to wood shavings, wood chips, wood fibers and / or cellulose fibers pressed into single or multiple lap core layers (lap core layers) Indoor or outdoor applications in buildings, where wood is partially acetylated, impregnated with synthetic resins as binders, cured with heat and pressed. For convenience, these panels / panels will be referred to as "composites" and generally include engineered wood products such as medium density fiberboard, oriented strand board, and particle board, primarily from softwood stock such as spruce or pine. Background technique [0002] Articles comprising such composite materials may be used for exterior facade cladding of buildings; exterior siding applications; structural applications in insulation and bracing; cladding of fences, roofs and floors, balconies; or cladding or cladding ; or can also be used for lining walls or...

Claims

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Application Information

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IPC IPC(8): C08L97/02C08H8/00C08G18/64
CPCB05D3/0254C09J161/06C08G18/7664B05D3/0473C08L97/02B27K3/34C09J175/04C08G18/6492C09J165/02C08H8/00Y10T428/2982Y10T428/25Y10T428/31986Y10T428/662Y10T428/31971Y10T428/31989Y02W30/91B27M1/08C08G18/64C09J175/00
Inventor 米歇尔·马斯贝诺·波尔
Owner TITAN WOOD LTD
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