Unlock instant, AI-driven research and patent intelligence for your innovation.

Novel modified wood and preparation method thereof

A wood modification technology, applied in the field of wood materials, can solve the problems of unfavorable cross-linking reaction and performance improvement, can not guarantee the complete impregnation of resin, high process cost, etc., achieve excellent dimensional stability, improve dimensional stability, and the effect is remarkable Effect

Active Publication Date: 2016-07-13
INNER MONGOLIA AGRICULTURAL UNIVERSITY
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of this process is relatively high, and the operation is cumbersome. The molecular weight of the synthesized resin is much larger than that of formaldehyde and urea. When vacuum impregnating wood, due to the increase in molecular weight, it cannot be guaranteed that the resin is completely impregnated in the wood, which is not conducive to forming interactions with wood. Link reaction and performance improvement

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Novel modified wood and preparation method thereof
  • Novel modified wood and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This embodiment provides a method for preparing a new type of modified wood. In the method, the wood is selected from Populus chinensis: 300 mm in longitudinal direction, 150 mm in chord direction, and 20 mm in radial direction.

[0042] The preparation method steps are as follows:

[0043] (1) Preparation of solution A: use a transparent plastic container with a temperature resistance range of -20-120℃ and a size of 400mm (length) × 275mm (width) × 103mm (height), and add 37% formaldehyde and Urea with a mass fraction of 99%, wherein formaldehyde and urea are prepared into a solution according to a molar ratio of 2:1, and ammonium chloride solution is added to adjust the pH to 4.5-5.0, thereby obtaining solution A;

[0044] (2) Vacuum impregnated wood: first dry the wood to a moisture content of 3-6%, then soak the wood in a plastic container filled with solution A, and place the plastic container in a vacuum drying box, and wait for it in the vacuum drying box When the vacu...

Embodiment 2

[0049] This embodiment provides a method for preparing a new type of modified wood. In the method, the wood is selected from Populus chinensis: 300 mm in longitudinal direction, 150 mm in chord direction, and 20 mm in radial direction.

[0050] The preparation method steps are as follows:

[0051] (1) Preparation of solution A: use a transparent plastic container with a temperature resistance range of -20-120℃ and a size of 400mm (length) × 275mm (width) × 103mm (height), and add 37% formaldehyde and Urea with a mass fraction of 99%, where formaldehyde and urea are prepared into a solution at a molar ratio of 1.5:1, and ammonium chloride solution is added to adjust the pH to 4.5-5.0, thereby obtaining solution A;

[0052] (2) Vacuum impregnated wood: first dry the wood to a moisture content of 3-6%, then soak the wood in a plastic container filled with solution A, and place the plastic container in a vacuum drying box, and wait for it in the vacuum drying box When the vacuum degree ...

Embodiment 3

[0057] This embodiment provides a method for preparing a new type of modified wood. In the method, the wood is selected from Populus chinensis: 300 mm in longitudinal direction, 150 mm in chord direction, and 20 mm in radial direction.

[0058] The preparation method steps are as follows:

[0059] (1) Preparation of solution A: use a transparent plastic container with a temperature resistance range of -20-120℃ and a size of 400mm (length) × 275mm (width) × 103mm (height), and add 37% formaldehyde and Urea with a mass fraction of 99%, where formaldehyde and urea are formulated into a solution with a molar ratio of 2:1, and 30% of the mass of the solution is added to distilled water for dilution, and ammonium chloride solution is added to adjust the pH to 4.5-5.0, To obtain solution A;

[0060] (2) Vacuum impregnated wood: first dry the wood to a moisture content of 3-6%, then soak the wood in a plastic container filled with solution A, and place the plastic container in a vacuum dryi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides novel modified wood and a preparation method thereof.The preparation method includes: mixing a formaldehyde solution with carbamide to obtain a solution, and adding a weak acid or acid salt solution to regulate pH value to obtain a mixed solution; on the premise of avoiding of polymerization reaction, soaking wood and quickly vacuumizing the wood; controlling the temperature to enable addition reaction and condensation polymerization reaction of formaldehyde and carbamide in the wood to realize synthesis of resin in the wood and wood modification, so that the novel modified wood is obtained.The preparation method is technically simple, easy to operate, low in cost and remarkably effective; low-molecular-weight monomers such as the formaldehyde and the carbamide are successfully led into the wood to synthesize a high-molecular-weight resin adhesive which reacts with hydrophilic hydroxyl groups in the wood to finally improve dimensional stability, corrosion resistance and mechanical performance of the wood.The novel modified wood obtained according to the method is excellent in dimensional stability, corrosion resistance and mechanical performance.

Description

Technical field [0001] The invention belongs to the field of wood materials, and specifically relates to a novel modified wood and a preparation method thereof. Background technique [0002] Urea-formaldehyde resin is the initial stage urea-formaldehyde resin polycondensation of urea and formaldehyde under the action of a catalyst (alkaline or acid catalyst), and then under the action of a curing agent or auxiliary agent, an insoluble and insoluble final resin is formed. It was first synthesized by B.Toiiens in 1844, and was used for the first time after research by C.Goldschmidt et al. in 1896; in 1929, the German Dyestuff Company (IG Company) obtained a patent for UF resin for bonding wood, and its product was named KanritLeim. This kind of UF resin prepolymer that can cure and glue wood at room temperature has attracted people's attention; UF resin was first sold in the market in 1931. Since then, UF resin has been widely used and rapidly developed in the wood processing indu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/52B27K3/02B27K3/08B27K3/15B27K5/04B27K1/00
CPCB27K1/00B27K3/0214B27K3/08B27K3/15B27K3/52B27K5/04
Inventor 王喜明李丽丽张晓涛
Owner INNER MONGOLIA AGRICULTURAL UNIVERSITY