Method for improving performance of fast-growing wood through acrylic acid rosin

A technology of acrylic rosin and wood, which is applied in wood treatment, impregnation of wood, wood impregnation, etc., can solve the problems of application limitations, insufficient binding ability, etc., and achieve the effects of limited weakening, reduced water absorption, and low production costs

Inactive Publication Date: 2020-04-17
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although natural rosin has certain rigidity and hydrophobicity, its binding ability with wood is insufficient, so its application in the wood field is limited.

Method used

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  • Method for improving performance of fast-growing wood through acrylic acid rosin
  • Method for improving performance of fast-growing wood through acrylic acid rosin
  • Method for improving performance of fast-growing wood through acrylic acid rosin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of acrylic rosin: Take 585g of refined rosin and 3.57g of hydroquinone (polymerization inhibitor) into a four-necked flask, pour nitrogen into it, stir, and raise the temperature to 100°C. After the refined rosin is completely dissolved and softened, the temperature is raised to 180°C. Stable for 30min. Then 130g of acrylic acid (with a mass ratio of 4.5:1 to the refined rosin) was added dropwise within 30 minutes, and the temperature was maintained at 180°C. After 1 hour, the temperature was raised to 200°C and stabilized for 2 hours. Before the end of the reaction, the temperature is raised to 230°C, the nitrogen flow rate is increased, the condenser tube is removed, and the unreacted acrylic acid is removed for 10 min. The temperature is lowered to about 150°C and the material is discharged to obtain acrylic rosin. The main component of the obtained acrylic rosin is acrylpimaric acid, and its molecular structure is as follows:

[0021]

Embodiment 2

[0023] Randomly select undamaged 20×20×20mm 3 The fast-growing poplar wood block is baked to a constant weight at 105°C, and the weight and size of the wood block are measured. Weigh 180 g of acrylic rosin, dissolve it in 720 g of absolute ethanol, and prepare an ethanol solution of acrylic rosin with a mass concentration of 20% as an immersion liquid. Place the fast-growing wood in the above-mentioned dipping solution for 30 minutes under a vacuum of 0.095MPa, immerse it for 24 hours at room temperature (25°C) and atmospheric pressure, filter out, and dry in an oven at 60°C for 4 hours to evaporate the ethanol, and then increase the temperature to Dry it at 105℃ for 12h to obtain acrylic rosin modified material (AACMWS). Measure its weight and size. After modification, the density of the modified acrylic rosin material increased by 27.55%, and the weight gain rate (WPG) was 30.79%, indicating that the acrylic rosin was successfully deposited in the wood.

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Abstract

The invention discloses a method for improving the performance of fast-growing wood by using acrylic acid rosin. The method comprises the following steps: preparing acrylic acid rosin, and dissolvingthe acrylic acid rosin in absolute ethyl alcohol to prepare an impregnation liquid; then putting fast-growing wood into the impregnation liquid, sequentially carrying out vacuum impregnation and room-temperature and normal-pressure impregnation, and then taking out the fast-growing wood; and putting the taken-out fast-growing wood into a drying oven, and drying to obtain the modified fast-growingwood. According to the invention, acrylic acid and refined rosin are used as raw materials, and are subjected to a D-A addition reaction to prepare acrylic acid rosin, wherein the acrylic acid contains carboxyl, so that the acrylic acid rosin contains two carboxyl so as to improve the bonding strength of rosin and wood by increasing the number of the carboxyl in the rosin; the acrylic acid rosin modified material prepared by the method has good water resistance, remarkably improved static bending strength, remarkably improved elasticity modulus, remarkably improved compressive strength and good mechanical properties, so that the limitation of fast-growing wood in application is weakened; and a new way is explored for high-value utilization of rosin, the additional value of rosin is increased, and the method is environmentally friendly.

Description

Technical field [0001] The invention belongs to the field of wood modification, and specifically relates to a method for improving the performance of fast-growing wood with acrylic rosin. Background technique [0002] As a natural renewable material, wood is widely used in outdoor construction, interior decoration, papermaking and other fields because of its unique high strength-to-weight ratio and easy processing characteristics. However, due to the low global growth rate of timber and stricter environmental regulations, high-quality timber is facing a shortage of supply. Artificial fast-growing forests have rapid growth, which makes my country's wood resource utilization mainly from natural forests to artificial fast-growing forests. Among them, fast-growing poplar has a short growth cycle and strong adaptability. It is very popular in the pulp, paper and veneer industries. It is an important fast-growing and high-yielding tree species in my country. However, fast-growing woo...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B27K3/08B27K3/50B27K5/04C09F1/04
CPCB27K3/08B27K3/50B27K5/04B27K2240/70C09F1/04
Inventor饶小平许吉宋湛谦商士斌
OwnerINST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY