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Process for wood acetylation and product thereof

An acetylation and wood technology, applied in the direction of impregnating wood, wood impregnation, wood processing appliances, etc., can solve the problem of not recording, and achieve the effects of avoiding recycling, reducing aesthetic appearance, and improving durability.

Active Publication Date: 2009-08-12
TITAN WOOD LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These studies have largely failed to document the introduction, realization of these desired properties when acetylating larger wood sizes, such as those commonly used in the construction and commercial industries

Method used

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  • Process for wood acetylation and product thereof
  • Process for wood acetylation and product thereof
  • Process for wood acetylation and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] will be about 0.4M 3 Rough-sawn radiata pine boards from Chile (with 11% moisture), separated vertically and horizontally with 15mm spacers. The board is 3.9m long x 55mm thick by 130mm wide and consists mostly of sapwood with some corewood. Put the wood in a liquid-filled capacity of 2.5M 3 in the reaction pressure vessel. The reaction vessel was equipped with a gas circulation loop.

[0054] A vacuum of 0.1 to 0.2 bar absolute is applied for 30 minutes. Immersion fluid (90% acetic anhydride and 10% acetic acid at ambient temperature) was used to release the vacuum and flood each panel. Vacuum is applied during filling. The absolute pressure was increased to 10 bar with nitrogen and maintained for 90 minutes. The free liquid was drained leaving a saturated board containing 1.5 to 1.7 kg of liquid per kg of wood.

[0055] Nitrogen saturated with acetic anhydride was used as the heating medium for the acetylation reaction. The purpose of saturating the gas with a...

Embodiment 2

[0063] will be about 0.4M 3 Rough-sawn Southern Ponderosa Pine boards (with 12% moisture) were separated vertically and horizontally with 15 mm spacers. The board is 3.9m long x 40mm thick by 140mm wide and consists of sapwood with some core material. Put the wood in a liquid-filled capacity of 2.5M 3 in the reaction pressure vessel. The reaction vessel was equipped with a gas circulation loop.

[0064] A vacuum of 0.1 to 0.2 bar absolute is applied for 30 minutes. Immersion fluid (92% acetic anhydride and 8% acetic acid at ambient temperature) was used to release the vacuum and flood each panel. Vacuum is applied during filling. The absolute pressure was increased to 10 bar using nitrogen and maintained for 60 minutes. The free liquid is drained, leaving a saturated board containing 1.0 to 1.2 kg of liquid per kg of wood.

[0065] Nitrogen saturated with acetic anhydride vapor was used as the heating medium for the acetylation reaction. The purpose of saturating the g...

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Abstract

The present invention relates to a method and a product thereof. More particularly, the invention relates to a method for acetylating wood and the wood obtained through the method.

Description

technical field [0001] The present invention relates to the modification of wood components, particularly solid, non-durable wood species by acetylation, to improve desired properties such as durability, dimensional stability, UV light stability and thermal conductivity. Wood species generally considered non-durable are softwoods from conifers and non-durable hardwoods as described in BRE Durability Classes 4 and 5 (see below). Background technique [0002] The benefits of acetylating solid softwoods, solid nondurable hardwoods, and wood veneers (collectively hereinafter lumber) have been extensively studied on a laboratory scale and documented in academic and industry publications. Broadly speaking, acetylation of wood converts hydroxyl groups in wood components to acetyl groups. This chemical modification thus has the effect of converting hydrophilic hydroxyl groups into hydrophobic acetyl groups. [0003] The prior art literature has mainly focused on improving the dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/08B27K3/34
Inventor K·吉洛特拉
Owner TITAN WOOD LTD
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