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Process for modifying synthetic resin impregnated wood

A technology of impregnating wood and synthetic resin, applied in the direction of impregnating wood, wood processing equipment, pressure impregnation, etc., can solve the problems of human body harm, ring mirror pollution, etc., and achieve the effects of good absorption, good processability, and expanded use range

Inactive Publication Date: 2010-11-10
辽宁精化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is usually adjusted by the resin content of the impregnation solution, but due to the limitation of the solubility of the resin and the viscosity of the solution, satisfactory results are often not obtained, and the free formaldehyde in the phenolic resin is relatively high, which can easily cause ring mirror pollution and harm the human body. the harm of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Raw material detection: 10% phenolic resin solution, the quality index is: the appearance is a brown-red transparent liquid; the optical density: the wavelength is 496nm, the thickness of the cuvette is 10mm, and the spectroscopic measurement is 1.298; the mass fraction of free formaldehyde is 0.35.

[0017] 1) Preparation of dipping solution:

[0018] Prepare 20kg of impregnation working solution:

[0019] 100% phenolic resin 2.0kg

[0020] Carbonamide 0.20kg

[0021] water balance;

[0022] The prepared impregnation solution contains 2.3 mol of free formaldehyde and 3.3 mol of carbonamide.

[0023] 2) impregnation: the density of 399 (kg / m 3 ) Poplar planks (200×20×4cm) with a mass of 6.4kg were added to the autoclave, sealed, connected to the vacuum system, vacuumed at 0.05MPa for 20min, pumped in the working fluid, changed the vacuum system to a pressurized system, and Pressurize at 0.7MPa for 1 hour, and take out the wood after the pressure is released. The m...

Embodiment 2

[0028] Raw material detection: 10% phenolic resin solution, the quality index is: the appearance is a brown-red transparent liquid; the optical density: the wavelength is 496nm, the thickness of the cuvette is 10mm, and the spectroscopic measurement is 1.280; the mass fraction of free formaldehyde is 0.34.

[0029] 1) Preparation of dipping solution:

[0030] Prepare impregnation working solution 21kg:

[0031] 100% phenolic resin 2.4kg

[0032] Carbonamide 0.25kg

[0033] water balance;

[0034] The prepared dipping solution contains 2.8mol of free formaldehyde and 4.2mol of carbonamide.

[0035] 2) impregnation: the density of 430 (kg / m 3 ) Poplar wood planks (200×20×4cm) with a mass of 6.9kg were added to the autoclave, sealed, connected to the vacuum system, vacuumed at 0.085MPa for 25min, pumped in the stain liquid working fluid, and changed the vacuum system to a pressurized system , pressurize at 0.8MPa for 55 minutes, and take out the wood after the pressure is re...

Embodiment 3

[0040] 1) Preparation of dipping solution:

[0041] Raw material detection: 10% phenolic resin solution, the quality index is: the appearance is a brown-red transparent liquid; the optical density: the wavelength is 496nm, the thickness of the cuvette is 10mm, and the spectroscopic measurement is 1.310; the mass fraction of free formaldehyde is 0.16.

[0042] Prepare 22.5kg of impregnation working solution:

[0043] 100% phenolic resin 3.8kg

[0044] Additive carbonamide 0.30kg

[0045] water balance;

[0046] The prepared impregnating solution contains 2.2 mol of free formaldehyde and 5.0 mol of carbonamide.

[0047] 2) impregnation: the density of 455 (kg / m 3 ) Poplar wood planks (200×20×4cm) with a mass of 7.3kg were put into the autoclave, sealed, connected to the vacuum system, vacuumed at 0.065MPa for 30min, and then pumped in the impregnating liquid working solution, and changed the vacuum system to pressurization The system is pressurized at 0.9MPa for 50 minutes,...

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Abstract

The invention relates to a process for modifying synthetic resin impregnated wood, comprising the following steps of: preparing 100 parts by mass of impregnation working solution including 10-20 parts of 100 percent phenolic resin liquid, 0.5-1.5 parts of carbomite and the balance of water; impregnating: adding wood into a high pressure autoclave, evacuating at 0.050-0.085MPa for 20-30min, sucking the impregnation working liquid and pressurizing at 0.7-0.9 MPa for 50-60min; and curing: placing the wood into a drying oven, raising the temperature to 90 DEG C within 3-4h, and drying at 90-95 DEG C for 3-4h. Special resorcin-formalin with the optical density of 1.280-1.330 is detected by using 10 percent of resorcin-formalin, carbamide (NH2)2CO, carbamide and free formaldehyde are added to generate urea resin to lower the residual quantity of formaldehyde and be beneficial to preventing phenolic resin from further polymerizing in storage, thereby being beneficial to absorbing; while the urea resin is elastic resin which can increase the elasticity of wood, damage load and increase the bending strength, therefore, the wood is not fragile and has good processabilitly, and the application range of modified wood is widened.

Description

technical field [0001] The invention relates to a wood chemical treatment method, in particular to a treatment method of impregnating wood with a phenolic resin solution. Background technique [0002] With the development of society, the consumption of wood is increasing year by year, while the available resources are decreasing year by year. Some varieties of wood resources are of poor quality, low density, low strength, brittle, and extremely perishable, which are difficult to be used for industrial purposes. Wood, for which a resin impregnation method is often used, increases density, strength and resistance to decay. [0003] Wood modification is usually impregnated with phenolic resin impregnation solution under pressure, and then cured at 100-105°C. This method makes the wood brittle, poor processing performance, and the shavings are finely broken, reducing the use value. In the invention of the application number 2008100132255, the present inventor once improved the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/08B27K3/36
Inventor 张兆群孙殿樑
Owner 辽宁精化科技有限公司
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