阅读说明：本技术 一种杉木疏水改性处理方法 (Hydrophobic modification treatment method for cedar ) 是由 毛克升 于 2019-10-25 设计创作，主要内容包括：本发明公开了一种杉木疏水改性处理方法,属于木材疏水处理技术领域。所述杉木疏水改性处理方法是先用环氧硅油溶液对杉木进行真空加压浸注处理,再对杉木进行常压加热处理。本发明提供的疏水改性处理方法可以显著提高杉木的疏水性、疏水稳定性和尺寸稳定性,防止杉木在户外和潮湿环境中使用时出现翘曲变形和发霉腐烂等问题,延长杉木的使用寿命,具有显著的经济价值和社会效益。(The invention discloses a cedar hydrophobic modification treatment method, and belongs to the technical field of wood hydrophobic treatment. The method for processing the hydrophobic modification of the cedar comprises the steps of carrying out vacuum pressurization impregnation processing on the cedar by using an epoxy silicone oil solution, and then carrying out normal-pressure heating processing on the cedar. The hydrophobic modification treatment method provided by the invention can obviously improve the hydrophobicity, hydrophobic stability and dimensional stability of the fir, prevent the problems of warping deformation, mildew, rot and the like of the fir when the fir is used outdoors and in a humid environment, prolong the service life of the fir, and has obvious economic value and social benefit.)

1. A cedar hydrophobic modification treatment method is characterized by comprising the following steps: firstly, carrying out vacuum pressurization impregnation treatment on the fir by using an epoxy silicone oil solution, and then carrying out normal-pressure heating treatment on the fir; the method comprises the following specific steps:

adding 1-10 g of 2-methylimidazole into 1000-2000 mL of N, N-dimethylformamide, mechanically stirring at room temperature for 5-10 min, adding 50-200 g of epoxy silicone oil, and continuously mechanically stirring at room temperature for 30-90 min to prepare a mixed solution of 2-methylimidazole and epoxy silicone oil; placing the dried fir sample in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.06-0.09 MPa, maintaining the pressure for 20-60 min, injecting the mixed solution, pressurizing to 1.0-1.5 MPa, maintaining the pressure for 1-2 h, and releasing the pressure; taking out the fir sample, and carrying out heating treatment for 6-10 h at the normal pressure of 70-100 ℃ to obtain the hydrophobically modified fir sample, namely the finished product.

Technical Field

The invention belongs to the technical field of wood hydrophobic modification treatment, and particularly relates to a cedar hydrophobic modification treatment method.

Background

The wood has the excellent characteristics of high strength-weight ratio, sound absorption, insulation, attractive appearance, easy processing, high content of high-quality fibers and the like, and is widely applied to various fields due to fast growth and high yield of China fir. However, because the fir contains a large amount of hydrophilic groups and porous structures, the common fir wood products have strong hygroscopicity, and are easy to warp and deform in the using process. If the defects (such as soft material, easy wet swelling and the like) of the fir are eliminated through hydrophobic modification treatment, the fir has the functions of water resistance, dimensional stability and the like, and the development of the fir industry can be effectively promoted. At present, the wood hydrophobic modification treatment method mainly comprises a physical method and a chemical method of surface coating. The physical method is generally to brush waterproof material on the outer surface of the wood or to pack the wood cell walls with swelling agent. The Chinese patent ZL 200810030688.2 is characterized in that the surface of wood is coated with a mixed solution of silicone oil and a silane compound, so that the wood has hydrophobic property. However, the surface coating physical modification method is only combined with the wood surface through physical adsorption, and the combination strength is poor. The chemical method can enable the super-hydrophobic structure and the wood to generate chemical bonding, the adhesion strength is improved, the appearance is easy to control, the treatment is uniform, and the structure is regular. At present, wood acetylation treatment is relatively mature and commercialized, but the shear strength of wood subjected to acetylation treatment is obviously reduced.

Disclosure of Invention

The invention provides a hydrophobic modification treatment method for cedarwood, aiming at the problems of easy wet swelling, warping deformation, mildewing and rotting and the like when the cedarwood is used in outdoor and humid environments. The hydrophobic modification treatment method provided by the invention can obviously improve the hydrophobicity, hydrophobic stability and dimensional stability of the fir, prevent the problems of warping deformation, mildew, rot and the like of the fir when the fir is used outdoors and in a humid environment, prolong the service life of the fir, and has obvious economic value and social benefit.

In order to achieve the purpose, the invention adopts the following technical scheme:

a hydrophobic modification treatment method of Chinese fir comprises vacuum pressurizing and impregnating Chinese fir with epoxy silicone oil solution, and heating Chinese fir under normal pressure.

The cedar hydrophobic modification treatment method comprises the following specific steps:

adding 1-10 g of 2-methylimidazole into 1000-2000 mL of N, N-dimethylformamide, mechanically stirring at room temperature for 5-10 min, adding 50-200 g of epoxy silicone oil, and continuously mechanically stirring at room temperature for 30-90 min to prepare a mixed solution of 2-methylimidazole and epoxy silicone oil; placing the dried fir sample in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.06-0.09 MPa, maintaining the pressure for 20-60 min, injecting the mixed solution, pressurizing to 1.0-1.5 MPa, maintaining the pressure for 1-2 h, and releasing the pressure; taking out the fir sample, and carrying out heating treatment for 6-10 h at the normal pressure of 70-100 ℃ to obtain the hydrophobically modified fir sample, namely the finished product.

The invention has the following remarkable advantages:

(1) according to the invention, the epoxy silicone oil is grafted on the surface of the fir by a chemical method, so that a stable hydrophobic layer is formed on the surface of the fir, water molecules are effectively prevented from entering the interior of the fir, the hydrophobicity, the hydrophobic stability and the dimensional stability of the fir are improved, the problems of warping deformation, mildew, rot and the like of the fir when the fir is used in outdoor and humid environments are prevented, and the service life of the fir is prolonged.

(2) The hydrophobic modification treatment method provided by the invention can obviously improve the hydrophobicity, hydrophobic stability and dimensional stability of the cedar, and has small influence on the strength and modulus of the cedar, the total dry shrinkage of the cedar before treatment is 8.2%, the bending strength is 57.3MPa, the bending elastic modulus is 7.70GPa, the contact angles are 82.3 degrees, 79.6 degrees, 76.4 degrees, 75.5 degrees and 74.7 degrees respectively at 0d, 1d, 3d, 5d and 7d, the total dry shrinkage of the cedar after treatment is 4.5-5.6 degrees, the bending strength is 55.5-56.7 MPa, the bending elastic modulus is 7.55-7.66 GPa, and the contact angles are 114-127 degrees, 112-124 degrees, 107-117 degrees, 104-113 degrees and 102-110 degrees respectively at 0d, 1d, 3d, 5d and 7 d.

Detailed Description

The advantages and effects of the hydrophobic modification treatment method for cedar in this embodiment are further illustrated by several sets of examples and comparative examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.