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Method of using additive containing lignin to prepare cottonwood plank stuff

A technology of additive preparation and poplar wood, which is applied in the direction of wood compression, impregnation of wood, wood impregnation, etc., can solve the problems of containing and harmful, and achieve the effect of simple production process, improved dimensional stability, and good dimensional stability

Inactive Publication Date: 2008-07-30
广西林安木业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many deficiencies in these methods, the most important of which is that the resin contains harmful free formaldehyde

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] The method for preparing poplar boards by utilizing lignin-containing additives, the preparation steps are:

[0009] a. Raw material preparation: select poplar slabs, and prepare mixed solutions of two formulas, formula one: a mixed solution of lignin solution and formaldehyde solution, and formula two: a mixed solution of lignin solution and furfural solution;

[0010] B. slab impregnation treatment: the prepared poplar slabs are respectively immersed in a sealed tank filled with two kinds of mixed impregnating solutions for vacuum treatment;

[0011] c. Slab pressing: put the poplar slab after the impregnation treatment in the previous step into a hot press and heat press to obtain a poplar board.

[0012] The air-dried moisture content of poplar slab is 9%. Step a prepares the mixed solution of two kinds of formulations. Among them, formula one is: a mixed solution of lignin solution and formaldehyde solution, wherein the mixed solution is composed of: the mass per...

Embodiment 2

[0014] The method for preparing poplar boards by utilizing lignin-containing additives, the preparation steps are:

[0015] c. Raw material preparation: select poplar slabs and prepare mixed solutions of two formulas, formula one: a mixed solution of lignin solution and formaldehyde solution, and formula two: a mixed solution of lignin solution and furfural solution;

[0016] D. slab impregnation treatment: the prepared poplar slabs are respectively immersed in a sealed tank filled with two kinds of mixed impregnating solutions for vacuum treatment;

[0017] c. Slab pressing: put the poplar slab after the impregnation treatment in the previous step into a hot press and heat press to obtain a poplar board.

[0018] The air-dried moisture content of the poplar slab is 10%. Step a prepares the mixed solution of two kinds of formulations. Among them, formula one is: a mixed solution of lignin solution and formaldehyde solution, wherein the composition of the mixed solution is: t...

Embodiment 3

[0020] The method for preparing poplar boards by utilizing lignin-containing additives, the preparation steps are:

[0021] e. Raw material preparation: select poplar slabs, and prepare mixed solutions of two formulas, formula one: a mixed solution of lignin solution and formaldehyde solution, and formula two: a mixed solution of lignin solution and furfural solution;

[0022] F. slab impregnation treatment: the prepared poplar slabs are respectively immersed in a sealed tank filled with two kinds of mixed impregnating solutions for vacuum treatment;

[0023] c. Slab pressing: put the poplar slab after the impregnation treatment in the previous step into a hot press and heat press to obtain a poplar board.

[0024] The air-dried moisture content of the poplar slab is 12%. Step a prepares the mixed solution of two kinds of formulations. Among them, formula one is: a mixed solution of lignin solution and formaldehyde solution, wherein the composition of the mixed solution is: ...

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Abstract

The invention relates to a method of preparing polar planks with additive containing lignin. Material preparation comprises the following steps: mixed solution of lignin solution and formaldehyde solution is prepared; liquor immersion of slabs is carried out: the prepared polar slabs are immersed in a sealed tank with the mixed solution of lignin and formaldehyde for vacuum treatment; the slabs are compressed: the obtained polar slabs are then placed in a hot press provided with a steam generating device for hot pressing; post treatment of slabs is carried out: the slabs after treated through the former steps are then piled up for 14 days and then made into polar compression planks. By adopting the method, the dimensional stability of the compression planks is greatly improved; the production technique is simple and the product performance index can achieve the performance index of the domestic like products. Meanwhile, the planks produced by the method of the invention have better dimensional stability under the precondition of good physical and mechanical property and produce no free formaldehyde.

Description

1. Technical field [0001] The invention belongs to the field of wood-based panel manufacturing, in particular to a method for preparing poplar boards. 2. Background technology [0002] Prior Art: Poplar is one of the main fast-growing plantation tree species in my country, and its material has defects such as soft wood, low density, low hardness, low strength, and perishability, which limits its scope of use. The transverse grain compression of wood can improve the physical and mechanical properties of wood with light and soft material, low density and poor processing performance. However, the main disadvantage of compressed wood is that it is not dimensionally stable. If it is immersed in water or left in the air to absorb moisture, it will gradually return to its original size. The method for fixing the deformation of compressed wood that is often used at home and abroad is to inject chemical agents such as phenolic resin and urea-formaldehyde resin into the wood interior...

Claims

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Application Information

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IPC IPC(8): B27M1/08B27K3/08B27K3/50B27M1/02
Inventor 卢晓宁王志强王超先夏积文易庠华那斌许俊
Owner 广西林安木业有限公司
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