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Technical method for lumber functionality improvement

A functional, wood technology, applied in wood treatment, wood impregnation, wood impregnation, etc., can solve the problems of difficult to maintain shape of compressed wood, slow infiltration speed, and complex synthetic resin process.

Inactive Publication Date: 2011-05-25
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The current methods of compressing or densifying wood can be summarized as steaming, compression, synthetic resin impregnation, etc. Compressed wood is difficult to maintain a certain shape, and it is easy to deform, crack, swell, etc.
This will be a great loss to the manufacturer or the consumer; and the use of synthetic resin to impregnate wood, due to the high viscosity of synthetic resin, slow infiltration speed, and small infiltration depth, is only suitable for surface densification treatment of boards, or the synthetic resin process is complicated. ,high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Example 1 Add hexamethylenetetramine accounting for 6% of the solid content of urea into the urea aqueous solution with a concentration of 40%. After stirring evenly, control the pH value of the solution to 6.4-6.5. The Italian poplar board with a content of 80% is impregnated. After the urea content absorbed by the wood reaches 11% of its absolute dry weight, the wood is put into a hot-pressed drying box under a pressure of 1.0 MPa and an initial temperature of 90 ℃, and the final temperature is 120 ℃, carry out mechanical pressure drying until the wood moisture content is 4%, and then cool to room temperature. The air-dry density of the obtained modified poplar board is 820Kg / m 3 , the maximum hygroscopic expansion coefficient is 22%, and its flame retardant oxygen index is 32.

example 2

[0014] Example 2 In the aqueous urea solution containing 40% concentration, add hexamethylenetetramine accounting for 6% of the solid content of urea, stir evenly, control the pH value of the solution to 6.4-6.5, and put it into a solution with a size of 50×1300×1200mm , The birch board with a moisture content of 88% is impregnated. After the urea content absorbed by the wood reaches 15% of its absolute dry weight, the wood is put into a hot-pressed drying box. Under the pressure of 1.1MPa, the initial temperature is Under the conditions of 100°C and final temperature of 130°C, carry out mechanical pressure drying until the wood moisture content is 5%, and then cool to room temperature. The obtained modified birch board has a density of 1100Kg / m 3 , the maximum hygroscopic expansion coefficient is 22%, and its flame retardant oxygen index is 32.

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PUM

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Abstract

The present invention discloses a technical method for lumber functionality improvement. By means of implementing a chemical modification processing to the lumber, a plurality of characters of the mechanical strength character, the flame-proof character, the anticorrosion character and the like are all improved, the technical method resolves the problems that the modifying agent of the existing modified technology is not environment protection or has a high price, the modification treating process is complex and the modified technology is only suitable for a densification processing of the sheet material surface; the technical method is simple, highly efficient, and energy-saving and environment protection. the steps is that a. adding hexamethylenetetramine sharing 6-10% of carbamide solidcontent into a carbamide water solution with a 40% concentration, mixing uniformly to control the pH value of the solution to be from 6.4-6.5; b. dipping the lumber by using the mixed solution, and controlling the absorbing quantity of the lumber to be 10-15% of the lumber overcooking quantity; c. mechanically pressurizing the lumber with 0.5-1.2MPa at a temperature range from 90-120 DEG C, at the same time, drying the lumber to complete the modification and dry of the lumber simultaneously. The principal characteristics is that the carbamide water solution is added with the hexamethylenetetramine which reacts with the carbamide to generate a polymer under a condition of heat pressing and drying at a temperature range from 90-120 DEG C, a cross-linking reaction is further occurred betweenthe polymer and lumber components, thereby the density and the dimension stability of the modified lumber are all improved.

Description

technical field [0001] The invention relates to a technical method for chemically modifying wood to improve its multiple properties and values, and belongs to the technical field of wood processing. Background technique [0002] Due to its own characteristics, namely: low basic density and air-dry specific gravity, soft and brittle material, poor physical and mechanical properties and dimensional stability of wood such as bending resistance, compressive strength and shear strength, it greatly limits its application. Wood modification is to change the physical and chemical properties of wood by adding chemical additives inside the wood, increase the properties that these woods do not have originally, and modify the poor quality wood into high-grade high-quality wood through technical treatment. The tempered wood and its deep-processed products have good properties of flame retardancy, corrosion resistance, moth resistance, moisture resistance and mechanical strength. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K5/04B27K3/52
Inventor 蒲俊文武国峰姜亦飞
Owner BEIJING FORESTRY UNIVERSITY