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Modified timber and preparation method thereof

A wood and modification technology, applied in wood treatment, wood heating, humidity-conditioning wood, etc., can solve the problems of poplar tree water resistance, corrosion resistance, poor dimensional stability, difficult to guarantee mechanical properties, poor weather resistance, etc. The effect of improving stability, realizing dimensional stability and expanding the scope of application

Active Publication Date: 2018-09-28
浙江龙达实业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, urea-formaldehyde resin is easy to decompose when encountering strong acid and strong alkali, and has poor weather resistance, poor initial viscosity, large shrinkage, and high brittleness; because urea-formaldehyde resin has hydrophilic groups, the water resistance, corrosion resistance and size The stability is poor, and the mechanical properties are difficult to guarantee

Method used

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  • Modified timber and preparation method thereof
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  • Modified timber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Constant temperature and humidity treatment of wood: the Populus tomentosa wood sample (hereinafter referred to as "sample") is placed in a constant temperature and humidity box at a temperature of 22 ° C and a humidity of 50%, and the humidity is adjusted until the sample The moisture content is in the range of 12-20%;

[0026] (2) Preparation of impregnation solution A: formaldehyde and urea are mixed to prepare a mixed solution, and the pH is adjusted to 5.1 to prepare impregnation solution A; the molar ratio of formaldehyde to urea is 2.3:1;

[0027] (3) Soak the sample treated in step (1) in the impregnating solution A for 20min at a temperature of 40°C and a vacuum of 0.15MPa; then release the vacuum and turn on the pressure pump to make the pressure in the reaction vessel reach 1.5MPa and keep After 1h, release the pressure;

[0028] (4) Preparation of impregnation solution B: mix formaldehyde and urea to prepare a mixed solution, adjust the pH to 7.1 to pre...

Embodiment 2

[0035] (1) Constant temperature and humidity treatment of wood: place the sample in a constant temperature and humidity box at a temperature of 25°C and a humidity of 55%, and perform humidity control until the moisture content of the sample is within the range of 16-18%. ;

[0036] (2) Preparation of impregnation solution A: formaldehyde and urea are mixed to prepare a mixed solution, and the pH is adjusted to 5.5 to prepare impregnation solution A; the molar ratio of formaldehyde to urea is 2.5:1;

[0037] (3) Soak the sample treated in step (1) in the impregnating solution A for 25min at a temperature of 47°C and a vacuum of 0.2MPa; then release the vacuum and turn on the pressure pump to make the pressure in the reaction vessel reach 1.65MPa and keep After 1.5h, release the pressure;

[0038] (4) Preparation of impregnation solution B: formaldehyde and urea are mixed to prepare a mixed solution, and the pH is adjusted to 8.0 to prepare impregnation solution B; the molar r...

Embodiment 3

[0045] (1) Constant temperature and humidity treatment of wood: place the sample in a constant temperature and humidity box with a temperature of 24°C and a humidity of 57%, and perform humidity control treatment until the moisture content of the sample is within the range of 15-20%. ;

[0046] (2) Preparation of impregnation solution A: formaldehyde and urea were mixed to prepare a mixed solution, and the pH was adjusted to 5.4 to prepare impregnation solution A; the molar ratio of formaldehyde to urea was 2.6:1;

[0047] (3) Soak the sample treated in step (1) in the impregnating solution A for 27min at a temperature of 45°C and a vacuum of 0.18MPa; then release the vacuum and turn on the pressure pump to make the pressure in the reaction vessel reach 1.6MPa and keep After 1.8h, release the pressure;

[0048] (4) Preparation of impregnation solution B: formaldehyde and urea are mixed to prepare a mixed solution, and the pH is adjusted to 7.7 to prepare impregnation solution...

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Abstract

The invention relates to the technical field of forest tree material processing and particularly discloses modified timber and a preparation method thereof. The mould proof grade, the corrosion prevention grade, the mechanical property and the size stability of the modified timber are remarkably improved; in addition, a plywood made of the modified timber is remarkably reduced in formaldehyde emission and improved in bonding strength, so that the application range of artificial forest timber is expanded, and the modified timber can replace high-quality natural forest timber to be widely used for processing and utilizing indoor heated floor, dampproof water resistant decorative material, furniture, door, window and the like, increases the additional value of the timber product and is broadin economical prospect.

Description

technical field [0001] The invention belongs to the technical field of forest material treatment, and in particular relates to a modified poplar wood and a preparation method thereof, in particular to a modified wood and a preparation method thereof; the wood is poplar tomentosa or poplar small leaves. Background technique [0002] The implementation of the national "natural forest protection project" and "fast-growing and high-yield forest base construction project" has made poplar, Chinese fir, masson pine and other artificial fast-growing forests become the main industrial timber tree species in my country; among them, Populus tomentosa is a native tree species in my country. Strong, tall tree, obvious sun-shading effect, but also has significant ecological functions such as oxygen release and carbon fixation, cooling and humidification, bacteria reduction and sterilization, and absorption of toxic and harmful substances. However, due to the rapid growth of wood represente...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K1/00B27K3/50B27K3/08B27K5/00B27K3/02B27K5/04
CPCB27K1/00B27K3/025B27K3/08B27K3/50B27K5/001B27K5/04B27K2240/20
Inventor 张建华
Owner 浙江龙达实业股份有限公司
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