阅读说明：本技术 一种提升木材防霉性能的处理方法 (Treatment method for improving mildew resistance of wood ) 是由 李明 李东猛 于 2019-11-04 设计创作，主要内容包括：本发明公开了一种提升木材防霉性能的处理方法,具体涉及木材处理技术领域,利用一次处理液对木材进行浸渍,其中含有的甲基丙烯酰氯可以与木材表面的羟基进行反应,同时向木材表面引入不饱和双键,提升了木材的疏水性能；接着利用二次处理液对木材进行浸渍,其中包含改性纳米铜,其是由甲基丙烯酸丁酯、苯乙烯在引发剂的作用下进行原位改性的,在纳米铜表面原位聚合,从而在纳米铜表面引入端基双键,当利用二次处理液对木材进行浸渍时,改性纳米铜表面的端基双键在引发剂作用下,与木材表面的双键发生加成聚合反应,提高了纳米铜与木材纤维的结合力和附着力,显著提升木材的防霉性能,同时向木材表面引入苯环、双键等基团,提高其疏水性能。(The invention discloses a treatment method for improving the mildew resistance of wood, and particularly relates to the technical field of wood treatment, wherein wood is impregnated by using primary treatment liquid, methacryloyl chloride contained in the primary treatment liquid can react with hydroxyl on the surface of the wood, and unsaturated double bonds are introduced to the surface of the wood, so that the hydrophobic property of the wood is improved; and then, impregnating the wood by using secondary treatment liquid, wherein the wood contains modified nano copper, butyl methacrylate and styrene are subjected to in-situ modification under the action of an initiator, and are subjected to in-situ polymerization on the surface of the nano copper, so that terminal group double bonds are introduced on the surface of the nano copper.)

1. A treatment method for improving the mildew resistance of wood is characterized by comprising the following steps:

(1) putting the wood into a vacuum impregnation tank, adding absolute ethyl alcohol into the vacuum impregnation tank until the wood is submerged, heating to 75-76 ℃, vacuumizing to 50-80Pa, carrying out vacuum impregnation treatment for 1-2h, slowly pressurizing to 1.8-2.0MPa, keeping for 2-3h, slowly releasing the pressure, and taking out the wood;

(2) wiping off ethanol on the surface of the wood obtained in the step (1), directly putting the wood into a microwave device, carrying out microwave treatment for 2-5min under 0.3-0.5KW, then increasing the power to 1.2-1.4KW, continuing the treatment for 1-2min, increasing the power to 2.2-2.3KW again, carrying out treatment for 30-40min, and taking out;

(3) immersing the wood obtained in the step (2) in the primary treatment liquid, heating to 50-60 ℃, performing ultrasonic treatment for 50-60min, taking out the wood, drying at 30-40 ℃ for 4-5h in a neon atmosphere, immersing in the secondary treatment liquid again, heating to 78-80 ℃, performing ultrasonic treatment for 70-80min, taking out the wood, and drying at 35-38 ℃ under the pressure of 1.2-1.4MPa in a xenon atmosphere;

wherein, the first treatment liquid consists of 20 to 30 percent of methacryloyl chloride and the balance of castor oil.

2. The treatment method for improving the mildew-proof performance of wood according to claim 1, wherein the ultrasonic treatment frequency in the step (3) is 50-60 KHz.

3. The treatment method for improving the mildew-proof performance of wood according to claim 1, wherein the secondary treatment liquid in the step (3) comprises the following components: 10-12 parts of modified nano copper, 100 parts of isopropanol, 200 parts of azodiisobutyronitrile and 20-30 parts of nano silica sol, wherein the solid content of the nano silica sol is 30-40%.

4. The treatment method for improving the mildew-proof performance of the wood according to claim 3, wherein the preparation method of the modified nano copper comprises the following steps:

adding 10-12 parts by weight of nano copper into 50-60 parts by weight of sodium dodecyl benzene sulfonate aqueous solution with the mass fraction of 2-3%, ultrasonically dispersing for 10-20min at 35-38KHz, stirring for 20-30min at 50-55 ℃ and 600rpm, filtering, drying, adding into 40-60 parts by weight of isopropanol, dispersing for 10-20min at 200-55 ℃ and 300rpm, adding 15-20 parts by weight of butyl methacrylate and 5-10 parts by weight of styrene, heating and refluxing in a nitrogen atmosphere, dropwise adding 3-5 parts by weight of azobisisobutyronitrile isopropanol solution with the mass fraction of 1-2%, continuously refluxing and stirring for reacting for 3-4h after dropwise adding is finished, cooling, filtering and drying to obtain the modified nano copper.

Technical Field

The invention belongs to the technical field of wood treatment, and particularly relates to a treatment method for improving the mildew resistance of wood.

Background

The wood is an important raw material in production and life, and is used anywhere from tables, chairs, stools to ship decks and the like. Because the wood is loose and porous and has strong hydrophilicity, the wood has great defects, the normal use is influenced by the corrosion of the wood due to mildew and worm damage, and the wood is not easy to be stored for a long time. Therefore, a series of processes are required to be performed on the wood before it is used.

The patent (application number is CN 108145817A) discloses a preparation method of mildewproof heat treatment wood and application thereof, copper-containing compound impregnation liquid prepared from copper hydroxide, diethanol amine, polyethylene glycol 200 and water is used for carrying out vacuum pressurization treatment on masson pine wood, and nano copper is obtained in situ in the wood by combining a traditional wood heat treatment method, so that the purpose of inhibiting mildew is achieved, but the bonding force between the nano copper and the wood is poor by the treatment method, and the waterproof performance of the wood is not improved.

Disclosure of Invention

In view of the above problems, the present invention aims to provide a treatment method for improving the mildew-proof performance of wood.

The invention is realized by the following technical scheme:

1. a treatment method for improving the mildew resistance of wood comprises the following steps:

(1) putting the wood into a vacuum impregnation tank, adding absolute ethyl alcohol into the vacuum impregnation tank until the wood is submerged, heating to 75-76 ℃, vacuumizing to 50-80Pa, carrying out vacuum impregnation treatment for 1-2h, slowly pressurizing to 1.8-2.0MPa, keeping for 2-3h, slowly releasing the pressure, and taking out the wood;

(2) wiping off ethanol on the surface of the wood obtained in the step (1), directly putting the wood into a microwave device, carrying out microwave treatment for 2-5min under 0.3-0.5KW, then increasing the power to 1.2-1.4KW, continuing the treatment for 1-2min, increasing the power to 2.2-2.3KW again, carrying out treatment for 30-40min, and taking out;

(3) immersing the wood obtained in the step (2) in the primary treatment liquid, heating to 50-60 ℃, performing ultrasonic treatment for 50-60min, taking out the wood, drying at 30-40 ℃ for 4-5h in a neon atmosphere, immersing in the secondary treatment liquid again, heating to 78-80 ℃, performing ultrasonic treatment for 70-80min, taking out the wood, and drying at 35-38 ℃ under the pressure of 1.2-1.4MPa in a xenon atmosphere;

wherein, the first treatment liquid consists of 20 to 30 percent of methacryloyl chloride and the balance of castor oil.

Further, the ultrasonic treatment frequency in the step (3) is 50-60 KHz.

Further, the secondary treatment liquid in the step (3) comprises the following components: 10-12 parts of modified nano copper, 100 parts of isopropanol, 200 parts of azodiisobutyronitrile and 20-30 parts of nano silica sol, wherein the solid content of the nano silica sol is 30-40%.

Further, the preparation method of the modified nano copper comprises the following steps:

adding 10-12 parts by weight of nano copper into 50-60 parts by weight of sodium dodecyl benzene sulfonate aqueous solution with the mass fraction of 2-3%, ultrasonically dispersing for 10-20min at 35-38KHz, stirring for 20-30min at 50-55 ℃ and 600rpm, filtering, drying, adding into 40-60 parts by weight of isopropanol, dispersing for 10-20min at 200-55 ℃ and 300rpm, adding 15-20 parts by weight of butyl methacrylate and 5-10 parts by weight of styrene, heating and refluxing in a nitrogen atmosphere, dropwise adding 3-5 parts by weight of azobisisobutyronitrile isopropanol solution with the mass fraction of 1-2%, continuously refluxing and stirring for reacting for 3-4h after dropwise adding is finished, cooling, filtering and drying to obtain the modified nano copper.

The invention has the beneficial effects that: the treatment method provided by the embodiment of the invention can effectively improve the mildew resistance and the hydrophobic property of the wood; firstly, the wood is subjected to vacuum-pressure impregnation by using absolute ethyl alcohol, the absolute ethyl alcohol can be fully immersed into the wood to promote the dissolution of partial protein, saccharide and the like in the wood, and then the hierarchical microwave treatment is carried out, so that the absolute ethyl alcohol immersed into the wood structure can be evaporated out together with partial protein and saccharide, the growth and the propagation of mould can be effectively prevented to a certain extent, and the mould-proof performance of the wood can be improved; the wood is impregnated by using the primary treatment liquid, the methacryloyl chloride contained in the primary treatment liquid can react with hydroxyl on the surface of the wood, and unsaturated double bonds are introduced to the surface of the wood, so that the hydrophobic property of the wood is improved; and then, impregnating the wood by using secondary treatment liquid, wherein the modified nano copper is prepared by carrying out in-situ modification on butyl methacrylate and styrene under the action of an initiator, carrying out in-situ polymerization on the surface of the nano copper, and introducing terminal group double bonds on the surface of the nano copper.

Detailed Description

The invention is illustrated by the following specific examples, which are not intended to be limiting.