阅读说明：本技术 一种实木板材抗弯曲变形的加工处理工艺 (Processing technology for bending deformation resistance of solid wood board ) 是由 赵卫 于 2019-10-28 设计创作，主要内容包括：本发明涉及木材加工技术领域,公开了一种实木板材抗弯曲变形的加工处理工艺,工艺方法如下：1)使用盐酸溶液和混合溶液对实木板材进行浸泡处理；2)将氧化钙和氧化铁混合后经煅烧和氢气还原,制得纳米铁粉；3)将纳米铁粉加入到纳米铝溶胶中,再加入芳纶纤维粉末和聚乙烯吡咯烷酮,混合搅拌后加入适量的无水乙醇和蒸馏水进行调配,制得处理液；4)使用处理液对实木板材进行浸渍处理,再经弯曲载荷下的加热处理和热压定型处理,即可完成处理工艺。该处理工艺通过抑制和阻碍实木板材纤维组织位错的滑移运动,提高了实木板材抵抗变形的能力,从而使得实木板材在使用过程中不易发生变形、翘曲,提高了板材尺寸的稳定性。(The invention relates to the technical field of wood processing, and discloses a processing technology for resisting bending deformation of a solid wood board, which comprises the following steps: 1) soaking the solid wood board by using a hydrochloric acid solution and a mixed solution; 2) mixing calcium oxide and ferric oxide, calcining and reducing with hydrogen to obtain nanometer iron powder; 3) adding nano iron powder into nano alumina sol, adding aramid fiber powder and polyvinylpyrrolidone, mixing and stirring, adding a proper amount of absolute ethyl alcohol and distilled water, and blending to prepare a treatment solution; 4) the solid wood board is dipped by using the treatment liquid, and then is subjected to heating treatment and hot-press forming treatment under a bending load, so that the treatment process can be completed. The treatment process improves the deformation resistance of the solid wood board by inhibiting and hindering the slippage movement of the fiber tissue dislocation of the solid wood board, so that the solid wood board is not easy to deform and warp in the use process, and the size stability of the board is improved.)

1. A processing technology for bending deformation resistance of solid wood boards is characterized by comprising the following specific technological methods:

1) soaking the solid wood board in a hydrochloric acid solution at 60-80 ℃ for 20-30min, taking out the solid wood board, soaking the solid wood board in a mixed solution consisting of aluminum chloride and ethanol at room temperature for 2-3h, taking out, and drying by using a supercritical carbon dioxide fluid to obtain a pretreated solid wood board;

2) mixing calcium oxide and ferric oxide according to a certain mass ratio, putting the mixture into a ball mill for uniform mixing, calcining the mixed powder in air, cooling the calcined powder along with the furnace after calcination is finished, taking out the calcined powder, putting the calcined powder into a tubular furnace, introducing hydrogen for heating reduction, cooling the calcined powder along with the furnace in a hydrogen atmosphere after the reduction is finished, taking out the cooled powder, adding the cooled powder into an ammonium chloride solution, stirring and cleaning the solution for 30 to 40 minutes, filtering the solution, cleaning the solution for 3 to 4 times by using absolute ethyl alcohol, and then drying the solution in vacuum to obtain nano iron powder;

3) adding nano iron powder into nano aluminum sol, performing dispersion treatment for 20-40min under 400-plus 500W ultrasonic wave to obtain mixed sol solution, then adding aramid fiber powder and a small amount of polyvinylpyrrolidone into the mixed sol solution, stirring for 1-2h at the rotation speed of 300-plus 400r/min, then adding a proper amount of absolute ethyl alcohol and distilled water, and preparing a treatment solution with the solid content of 5-8% by blending;

4) adding the treatment liquid into a dipping treatment tank, then putting the pretreated solid wood board into the treatment tank, completely immersing the solid wood board in the treatment liquid, then carrying out dipping treatment on the solid wood board by adopting a vacuumizing dipping treatment method, taking out the board after the treatment is finished, drying the board until the water content is 5-7%, then carrying out heating treatment under bending load on the dried board in an oxygen-enriched environment, then turning over the solid wood board, carrying out heating treatment under the same load again, and carrying out hot-pressing shaping on the treated board, thus finishing the treatment process.

2. The processing technology for the bending deformation resistance of the solid wood panel according to claim 1, wherein in the process step 1), the concentration of the hydrochloric acid solution is 10-15%; the mixed solution consists of 60-70% of ethanol and 2-5mol/L of aluminum chloride solution according to the volume ratio of 2-4: 1; the drying temperature of the supercritical carbon dioxide fluid is 50-60 ℃, the pressure is 10-14MPa, and the drying time is 2-4 h.

3. The processing technology for resisting bending deformation of the solid wood board as claimed in claim 1, wherein in the processing step 2), the mass ratio of the calcium oxide to the iron oxide is 7: 15-30; the ball-material ratio of the ball mill is 5-7:1, the rotating speed is 300-; the calcination temperature is 1000-1100 ℃, and the calcination time is 2-3 h; the temperature of the thermal reduction is 650-750 ℃, and the thermal reduction time is 2-3 h; the concentration of the ammonium chloride solution is 0.1-0.4mol/L, and the rotating speed of stirring and cleaning is 100-170 r/min; the volume ratio of the absolute ethyl alcohol to the distilled water is 1: 1; the temperature of the vacuum drying is 80-90 ℃, and the drying time is 3-5 h.

4. The processing technology for resisting bending deformation of the solid wood board as claimed in claim 1, wherein in the process step 3), the solid content of the nano aluminum sol is 20-25%; the addition amount of the nano iron powder is 15-20% of the weight of the nano aluminum sol, the particle size of the aramid fiber powder is 10-15um, the addition amount of the aramid fiber powder is 6-9% of the weight of the nano aluminum sol, and the addition amount of the polyvinylpyrrolidone is 1-2% of the weight of the nano aluminum sol.

5. The processing and treatment process for bending deformation resistance of the solid wood panel according to claim 1, wherein in the process step 4), the vacuum impregnation treatment process comprises the following steps: vacuumizing the impregnation tank to-0.13 to-0.21 MPa, treating under negative pressure for 40-50min, then relieving the vacuum, pressurizing to 0.5-1.0MPa in the impregnation tank, treating under pressure for 2-3h, and repeating the above treatment for 3-5 times.

6. The processing and treatment process for bending deformation resistance of the solid wood panel according to claim 1, wherein in the process step 4), the heating treatment process under the bending load is as follows: applying load on the surface of the solid wood board to ensure that the bending corner of the solid wood board is 7-12 ℃, and then bending and heating the solid wood board at the temperature of 160-190 ℃ for 6-10 h.

7. The processing technology for resisting bending deformation of the solid wood board as claimed in claim 1, wherein in the process step 4), the oxygen content in the oxygen-rich environment is 45-55%; the hot-pressing setting temperature is 120-150 ℃, the hot-pressing pressure is 3-6MPa, and the hot-pressing time is 5-10 min.

Technical Field

The invention belongs to the technical field of wood processing, and particularly relates to a processing technology for bending deformation resistance of a solid wood board.

Background

The wood is widely used for interior decoration and decoration of buildings, not only gives people natural and beautiful enjoyment, but also can make the indoor space generate warm feeling and intimacy. Wood is an important renewable resource, and the comprehensive utilization level of the wood is directly related to global economy and even social sustainable development. It has been shown that heat treatment can improve the dimensional stability of wood.

Chinese patent CN2018113518040 discloses an integrated process of wood drying and low-temperature heat treatment, which is characterized in that through reasonably controlling relevant process parameters of a vacuumizing stage, a heating and warming stage, a low-temperature heat treatment stage and a cooling and cooling stage, the wood is subjected to mild carbonization treatment by using heat in the drying process and discharged water, so that the stability of the wood size is effectively improved, but the color of the wood is deepened after the treatment, the color appearance of the wood is damaged, the carbonization treatment degree is low, and the long-term stability of the wood size can not be maintained; chinese patent CN2015102306478 discloses a method for improving wood size stability, by means of wax injection treatment of wood under normal pressure condition, on the premise of not damaging wood performance, petroleum wax is injected into the interior of wood, so that excess moisture in the interior of wood is discharged, and at the same time, the pore and intercellular gap of the closed wood are filled, so that the stability of wood size is raised.

Disclosure of Invention

The invention aims to solve the existing problems and provides a processing technology for the bending deformation resistance of a solid wood board, which improves the deformation resistance of the solid wood board by inhibiting and hindering the slippage movement of the fiber tissue dislocation of the solid wood board, so that the solid wood board is not easy to deform and warp in the use process, thereby improving the size stability of the board.

The invention is realized by the following technical scheme:

a processing technology for bending deformation resistance of solid wood boards comprises the following specific technological methods:

1) soaking the solid wood board in 10-15% hydrochloric acid solution at 60-80 ℃ for 20-30min, taking out the solid wood board, soaking in a mixed solution of 60-70% ethanol and 2-5mol/L aluminum chloride solution at a volume ratio of 2-4:1 at room temperature for 2-3h, taking out, and drying with supercritical carbon dioxide fluid at 50-60 ℃ and 10-14MPa for 2-4h to obtain a pretreated solid wood board; according to the invention, the solid wood board is soaked by using the dilute hydrochloric acid solution and the mixed solution, so that part of lignin in the intercellular layer of the board can be decomposed, ions in the mixed solution are soaked into the cell wall of the board, and the distance between cellulose microfibrils is increased, so that the cell wall of the board is expanded, and the treatment solution can better permeate into the board in the subsequent vacuumizing impregnation treatment;

2) mixing calcium oxide and ferric oxide with the mass ratio of 7:15-30, putting the mixture into a ball mill with the ball-material ratio of 5-7:1, ball milling is carried out for 3-5h at the rotating speed of 300-400r/min, then in air, calcining the mixed powder at the temperature of 1000-1100 ℃ for 2-3h, cooling the mixed powder along with the furnace after the calcination is finished, taking the mixed powder out, then putting the mixed powder into a tubular furnace, introducing hydrogen, heating and reducing at 650-750 deg.C for 2-3h, cooling in the furnace under hydrogen atmosphere after reduction is finished, taking out, adding into 0.1-0.4mol/L ammonium chloride solution, stirring and cleaning at the rotation speed of 100-, then vacuum drying at 80-90 deg.C for 3-5h to obtain nanometer iron powder; calcium ferrite precursor can be obtained by using calcium oxide and ferric oxide as raw materials through high-temperature calcination, and then nanometer iron powder can be obtained through heating reduction treatment in hydrogen atmosphere and reduction of hydrogen;

3) adding nano iron powder into nano aluminum sol with the solid content of 20-25% according to 15-20% of the weight of the nano aluminum sol, performing dispersion treatment for 20-40min under 400-plus 500W ultrasonic waves to obtain mixed sol solution, sequentially adding aramid fiber powder with the particle size of 10-15 mu m and polyvinylpyrrolidone into the mixed sol solution according to 6-9% and 1-2% of the weight of the nano aluminum sol, stirring for 1-2h at the rotation speed of 300-plus 400r/min, adding absolute ethyl alcohol and distilled water with the volume ratio of 1:1, and preparing treatment solution with the solid content of 5-8%; the added polyvinylpyrrolidone can prevent agglomeration among particles in the treatment solution and improve the suspension stability of the treatment solution;

4) adding the treatment liquid into an impregnation treatment tank, then placing the pretreated solid wood board into the treatment tank to enable the solid wood board to be completely immersed in the treatment liquid, vacuumizing the impregnation tank to-0.13-0.21 MPa, carrying out negative pressure treatment for 40-50min, then removing the vacuum, pressurizing the impregnation tank to 0.5-1.0MPa, carrying out pressurization treatment for 2-3h, repeating the treatment for 3-5 times, carrying out impregnation treatment on the solid wood board, taking out the board after the treatment is finished, drying the board until the water content is 5-7%, then applying a load on the surface of the solid wood board in an environment with the oxygen content of 45-55% to enable the bending rotation angle of the solid wood board to be 7-12 ℃, then bending and heating the board at 190 ℃ for 6-10h, then turning over the solid wood board, and then carrying out heating treatment under the same load again, the treated plate is subjected to hot-pressing setting treatment for 5-10min at the temperature of 120-150 ℃ and the hot-pressing pressure of 3-6MPa, so that the treatment process can be completed; the method comprises the steps of penetrating a treatment solution into a solid wood board by adopting a vacuum-pumping impregnation treatment method, increasing the penetration amount of the treatment solution in the board by adopting a vacuum-pumping-pressurizing interactive treatment method, improving the distribution uniformity of solid particles in the treatment solution in the solid wood board, then carrying out bending load heat treatment in an oxygen-rich environment, bending the solid wood board by applying a load to the solid wood board, wherein the applied load causes dislocation accumulation of a large amount of fiber tissues on the surface of the solid wood board, the formed dislocation accumulation and the oxygen atoms in the gaps of the board have an obvious mutual attraction effect, so that the absorption of oxygen elements is promoted, the oxygen elements are diffused and dissolved to the surfaces of nano aluminum and nano iron in the heating treatment process to form an aluminum oxide solid solution and a ferrite solid solution, and the dissolved oxygen atoms are fixed in the crystal lattices of the nano aluminum and the nano iron to cause the expansion distortion of the crystal lattices, the arrangement of the nano aluminum and the nano iron in the solid wood board after expansion distortion becomes disordered, so that the sliding movement of the fiber tissue dislocation of the solid wood board is hindered, the deformation resistance of the solid wood board is improved, and the treated solid wood board is not easy to deform; infiltration advanced aramid fiber in the solid wood panel, in heat treatment process, the oxygen element that is rich in the panel makes aramid fiber take place thermal oxidation, make aramid fiber a small amount of fracture phenomenon appear, a small amount of granule appears on aramid fiber's surface simultaneously, slot and hole, thereby make aramid fiber's roughness on surface increase, area of contact between aramid fiber and the panel cellulose has been improved, bonding strength between the two has been improved, through the intercombination between aramid fiber and the cellulose, the slip motion ability of fibrous tissue has been reduced, thereby fibrous tissue's slip motion has been suppressed, can further prevent solid wood panel deformation from taking place.

Compared with the prior art, the invention has the following advantages:

according to the treatment process provided by the invention, the prepared treatment liquid is permeated into the solid wood board, the solid wood board is subjected to heating treatment and hot-pressing shaping treatment under the bending load in an oxygen-enriched environment, and the deformation resistance of the solid wood board is improved by inhibiting and hindering the slippage movement of the fiber tissue dislocation of the solid wood board, so that the solid wood board is not easy to deform and warp in the use process, and the size stability of the solid wood board is improved.

Detailed Description

The present invention will be further described with reference to specific embodiments.