Modified wood composition and its manufacturing method and application

A technology of wood modification and composition, which is applied in the direction of impregnating wood, wood impregnation, wood processing equipment, etc., can solve the problems of reduced wood performance, poor wood impregnation effect, high viscosity of urea-formaldehyde resin, etc., to solve cracking deformation, physical Improvement of mechanical properties and environmental protection of the system process

Inactive Publication Date: 2009-10-07
EVERFIRST WISEFUND TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The key factors of chemical modification of wood impregnation are impregnation, curing effect and cost. The most commonly used raw material for wood treatment is urea-formaldehyde resin with low cost. Poor impregnation effect limits its further use
In order to increase its solubility, the traditional method adds alcohol (methanol or ethanol), which increases the cost and increases environmental problems, or in order to ensure the impregnation effect, the impregnation is performed by monomer impregnation. Due to the curing characteristics of urea-formaldehyde resin, The way of monomer is not convenient for the further curing of the resin, which reduces the performance of the impregnated wood

Method used

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  • Modified wood composition and its manufacturing method and application
  • Modified wood composition and its manufacturing method and application
  • Modified wood composition and its manufacturing method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] One, the preparation of wood modification composition

[0041] (1) Preparation of component A: Take 550kg of formaldehyde (37%) and add 30% sodium hydroxide to adjust the pH to 8.0-8.5, add 207kg of urea, heat up to 90°C for 30 minutes, and keep warm for 20 minutes; add citric acid to adjust the pH to 4.6 ~4.8, temperature 90℃, polycondensation reaction 50~60min (refer to 30℃ Tu-4 viscosity 14~20s), adjust pH 7.5~8.0, cool down and discharge.

[0042] (2) Preparation of component B: Take 100kg of formaldehyde (37%), add 23kg of water, add 25% ammonia water to adjust the pH to 8.0-8.5, add 148kg of urea, heat up to 90°C for 30 minutes, keep warm for 15 minutes, adjust the pH to 7.0 with 25% ammonia water. 5-8.0, cooling and discharging;

[0043] The modified composition of the present invention is obtained by mixing component A and component B according to a weight ratio of 1:1, and its properties are shown in Table 1.

[0044] Table 1 Performance of modified compositi...

Embodiment 2

[0053] One, the preparation of wood modification composition

[0054] (1) Preparation of component A: Take 500kg of glyoxal (40%) and add 25% ammonia water to adjust the pH to 8.5-9.0, add 207kg of urea, heat up to 85°C in 35 minutes, keep warm for 30 minutes; add oxalic acid to adjust the pH to 4.8- 5.0, temperature 85°C, polycondensation reaction 40min (refer to 30°C Tu-4 viscosity 14~20s), adjust pH 8.0~8.5, cool down and discharge.

[0055] (2) Preparation of component B: Take 200kg of glyoxal (40%), add 66.7kg of water, add 25% ammonia water to adjust the pH to 8.5-9.0, add 138kg of urea, heat up to 85°C for 35 minutes, keep warm for 35 minutes, 25% ammonia water Adjust the pH to 8.5-9.0, cool down and discharge. ;

[0056] The modified composition of the present invention is obtained by mixing component A and component B according to a weight ratio of 1:1, and its properties are shown in Table 3.

[0057] Table 3 Performance of modified composition of the present inve...

Embodiment 3

[0066] One, the preparation of wood modification composition

[0067] (1) Preparation of component A: Take 580kg of propionaldehyde (100%) and add 25% ammonia water to adjust the pH to 8.5-9.0, add 487kg of triethylenetetramine, heat up to 85°C for 40 minutes, and keep warm for 30 minutes; add oxalic acid to adjust the pH to 3. 8~4.0, temperature 90℃, polycondensation reaction 50min (refer to 30℃ Tu-4 viscosity 14~20s), adjust pH 9.5~10.0, cool down and discharge.

[0068] (2) Preparation of component B: Take 200kg of formaldehyde (37%), add 50kg of water, add 30% sodium hydroxide to adjust the pH to 9.5-10.0, add 180kg of triethylenetetramine, heat up to 90°C in 45 minutes, and keep the temperature for 40 minutes. % ammonia water to adjust the pH to 9.5-10.0, cool down and discharge. ;

[0069] The modified composition of the present invention is obtained by mixing component A and component B according to a weight ratio of 1:1, and its properties are shown in Table 5.

[0...

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Abstract

The invention discloses a kind of modified wood composition and its preparation method and application, which is part of the forest chemical industry. This invention of modified wood composition consists of low molecular urea-formaldehyde resin and methylol urea mixture; the described methylol urea mixture mainly consists of monomethylurea and dimethylolurea. The modified wood composition of this invention featuring low viscosity, water-solubility and good storage stability is suitable for the use of vacuum pressure impregnation of a variety of tree species, especially suitable for increasing the density of low-end plantation, function, etc. After the modification of plantation timber by the modified wood composition, the invention may significantly increase the timber size stability, overcome the cracking and deformation defects before the application, and significantly improve the physical and mechanical properties. The modified wood composition, if working with the functional reagents with good water-solubility as the flame retardant, preservative and so on, may improve the timber performance as fire-retardation, moth proofing, mildew proofing and antisepsis properties.

Description

technical field [0001] The present invention relates to a composition for treating wood, in particular to a low-molecular resin composition for wood vacuum pressure impregnation modification and a preparation method thereof, and also relates to the application of the wood modification composition in wood vacuum pressure impregnation modification , belonging to the field of forestry chemical industry. Background technique [0002] Wood is a friend of human beings, and it is the only renewable resource among the four major building materials (steel, wood, cement, plastic) recognized today. However, my country is a country with relatively insufficient forest resources, and the per capita forest stock volume is only the world average level. 1 / 6 of. In recent years, due to people's over-exploitation, forest resources worldwide have declined sharply. The reduction of tropical rainforest in some parts of South America, the destruction of primary forest in some African countries, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/50B27K3/08
Inventor 雷得定邓雄飞
Owner EVERFIRST WISEFUND TECH BEIJING
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