CN106926333B - Improve processing method of the wood surface to paint film adhesion - Google Patents
Improve processing method of the wood surface to paint film adhesion Download PDFInfo
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- CN106926333B CN106926333B CN201710091781.3A CN201710091781A CN106926333B CN 106926333 B CN106926333 B CN 106926333B CN 201710091781 A CN201710091781 A CN 201710091781A CN 106926333 B CN106926333 B CN 106926333B
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- wood
- temperature
- treatment
- plasma jet
- processing method
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- 239000002023 wood Substances 0.000 title claims abstract description 68
- 239000003973 paint Substances 0.000 title claims abstract description 22
- 238000003672 processing method Methods 0.000 title claims abstract 8
- 238000011282 treatment Methods 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 11
- 238000004381 surface treatment Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 241000218652 Larix Species 0.000 claims description 5
- 235000005590 Larix decidua Nutrition 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 13
- 239000000463 material Substances 0.000 description 8
- 230000007935 neutral effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 241000544657 Larix gmelinii Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000034655 secondary growth Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010875 treated wood Substances 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/001—Heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/0015—Treating of wood not provided for in groups B27K1/00, B27K3/00 by electric means
- B27K5/002—Electric discharges, plasma
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The present invention provides a kind of new temperature programming heat treatments and the plasma jet method that is combined of processing to be surface-treated to timber, solve the problems, such as that wood surface caused by prior heat treatment method reduces paint film adhesion, after being surface-treated to timber using method of the present invention, wood surface, which has the adhesive force of paint film, to be greatly improved.And the processing method will not destroy the internal structure of timber, and it is easy to operate, it can be promoted and applied as a kind of good Wood treatment method.
Description
Technical Field
The invention relates to a surface treatment method in the field of chemical materials, in particular to a treatment method for improving the adhesion of a paint film on the surface of wood, especially larch wood.
Background
The relatively low-quality artificial forest in China, particularly larch wood, is rich in accumulation, heavy and solid in texture, high in compression strength and bending strength and good in corrosion resistance, is a good material for electric poles, sleepers, bridges, ore pillars, vehicles, buildings and the like, and has the defects of application in stability and color. The high-temperature heat treatment of the wood is a common wood modification method, the process flow is simple, the treatment process is pollution-free to the environment, the quality of the wood can be improved, the moisture absorption and water absorption of the wood are reduced, the dimensional stability, the biological corrosion resistance and the weather resistance are improved, the dimensional stability of the larch can be effectively improved, the color of the wood is deepened, the wood is gradually transited from the primary color to the dark brown color, meanwhile, the color difference of the wood can be reduced, or the color difference of the treated material with larger color difference tends to be uniform, and the observability of the wood is improved.
However, after the wood is improved by the current high-temperature heat treatment technology, the surface finishing performance and the adhesive property of the wood, particularly the adhesive force of the wood surface to a paint film, are reduced, and the functional improvement and the decorative characteristic of the wood products are directly influenced. Therefore, in order to improve the surface properties of wood, especially the adhesion of the wood surface to the paint film, a new method for performing surface functional treatment on wood is needed to improve the adhesion of the paint film on the wood surface.
Disclosure of Invention
In view of the above problems, an aspect of the present invention provides a treatment method capable of improving paint film adhesion on a wood surface, comprising:
carrying out temperature programming heat treatment, and adjusting the water content of the wood to 5-7%;
plasma jet surface treatment, in which,
the working gas of the plasma jet processor is nitrogen, and the working pressure is 0.05-0.07Mpa, such as 0.05Mpa, 0.06Mpa, 0.07 Mpa.
In certain embodiments, the plasma jet has a treatment height of 15-35mm, e.g., 15mm, 25mm, 35 mm.
In certain embodiments, the plasma jet has a treatment time of 15-45s, e.g., 15s, 25s, 30s, 40s, 45 s.
In certain embodiments, the plasma surface treating machine has a power of 180-200W.
The wood according to the present invention is a lignified tissue formed by a plant capable of secondary growth. After the primary growth of these plants is completed, the vascular layer in the rootstocks starts to move, developing phloem outward and wood inward. In certain embodiments, the wood is larch.
The temperature-programmed heat treatment in the invention refers to a treatment process of continuously increasing or decreasing the sample linearly or nonlinearly gradually according to a set program, wherein inert gas can be introduced in the treatment process.
In certain embodiments, the temperature-programmed heat treatment comprises the steps of,
a first temperature rise step: gradually increasing the temperature from room temperature to 120 ℃ at the speed of 15 ℃/h, and preserving the temperature for 3 h;
a second temperature rise step: introducing inert gas to keep the mass fraction of oxygen in the heat treatment chamber lower than 5%, continuously raising the temperature to 150 ℃ at the speed of 10 ℃/h, and preserving the heat for 3 h;
a third temperature rise step: continuously introducing inert gas to keep the oxygen mass fraction in the heat treatment chamber lower than 5%, raising the temperature to 240 ℃ at the speed of 10 ℃/h, and preserving the temperature for 6 h;
and a cooling step, naturally cooling the heat treatment chamber to room temperature, and adjusting the moisture content value of the wood to be 5-7% in the process.
Wood and its products, in their normal state, have a certain amount of moisture. The moisture content of the wood is the percentage of the weight of moisture contained in the wood to the weight of the wood after the wood is absolutely dried. The water content is measured by referring to a GB/T1931-2009 wood water content measuring method.
When the gas is subjected to external effects such as heating, electric field, high-energy radiation and the like, electronic structures such as atoms, molecules and the like in the gas are recombined to form excited electrons, ions and neutral particles. The plasma according to the present invention refers to a gas mixture consisting of electrons, ions and neutral particles in ground and excited states. From a macroscopic point of view, the plasma is electrically neutral. Unlike a normal solid, liquid or gaseous species, the plasma is therefore referred to as the fourth state of the species.
The plasma jet can generate plasma in an open space instead of only a discharge gap as in the traditional discharge, and the operation is simpler and more convenient. The treatment level according to the invention refers to the distance of the level of the plasma stream at the outlet of the plasma jet treatment machine from the surface of the wood parallel to said plasma stream.
The wood is generally required to be subjected to high-heat treatment when in use, but the surface finishing performance and the adhesive bonding performance, particularly the paint film adhesion, of the wood subjected to the traditional high-temperature heat treatment are reduced. The temperature programmed heat treatment provided by the invention can better treat the surface of the wood by regulating and controlling different temperature-rising speeds, heat-preserving temperatures and time, and then the wood treated by the temperature programmed heat treatment is treated by combining with plasma jet flow surface treatment, so that a large amount of free radicals can be introduced into lignin, cellulose and hemicellulose on the surface of the wood, the surface hydrophilicity is increased, the free energy on the surface of the wood is improved, and the paint film adhesive force on the surface of the wood is greatly improved.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention.
Examples
Larix Gmelini was first processed into a planed material of 300mm (length) × 100mm (width) × 10mm (thickness) for use in examples and comparative examples, respectively.
And taking a piece of the planed and polished material which is processed and formed, and sequentially carrying out temperature programming heat treatment and plasma jet treatment. Wherein,
temperature programmed heat treatment process:
a piece of the processed planed material is put into a heat treatment chamber and then subjected to temperature programmed heat treatment according to the following steps.
A first temperature rise step: gradually increasing the temperature from room temperature to 120 ℃ at the speed of 15 ℃/h, and preserving the temperature for 3 h;
a second temperature rise step: introducing nitrogen to keep the mass fraction of oxygen in the heat treatment chamber lower than 5%, continuously raising the temperature to 150 ℃ at the speed of 10 ℃/h, and preserving the heat for 3 h;
a third temperature rise step: continuously introducing nitrogen to keep the mass fraction of oxygen in the heat treatment chamber lower than 5%, raising the temperature to 240 ℃ at the speed of 10 ℃/h, and preserving the temperature for 6 h;
and a cooling step, naturally cooling the heat treatment chamber to room temperature, and adjusting the moisture content value of the wood to be 5-7% in the process.
Plasma jet treatment process:
and adjusting the working pressure, power, treatment height and treatment time of the plasma jet treatment machine, wherein the working gas is nitrogen, and performing nitrogen plasma jet treatment on the wood subjected to the temperature programming heat treatment to obtain the surface-treated wood.
Wherein the working pressure, power, treatment height and treatment time of the jet plasma treatment machines used in examples 1 to 9 and comparative examples 1 to 5 are specified as shown in Table 1, and comparative example 6 is a process in which only the temperature-programmed heat treatment process is performed on wood without performing the plasma jet treatment. The wood treated in examples 1 to 9 and comparative examples 1 to 6 were painted with the same aqueous paint of wood in the same manner, and then subjected to an adhesion test by a cross-cut method, with specific reference to the national standard GB/T9286-1998, and the results of the adhesion test between the wood and the paint film of the different examples and comparative examples are shown in Table 1.
TABLE 1
| Sample (I) | Power of | Operating pressure | Moisture content of wood | Time of treatment | Height of treatment | Adhesion force |
| Example 1 | 190W | 0.06MPa | 6％ | 30s | 25mm | Level 0 |
| Example 2 | 180W | 0.07MPa | 6％ | 20s | 35mm | Level 0 |
| Example 3 | 200W | 0.05MPa | 5％ | 35s | 15mm | Level 0 |
| Example 4 | 190W | 0.06MPa | 7％ | 15s | 25mm | Level 0 |
| Example 5 | 190W | 0.06MPa | 6％ | 45s | 30mm | Level 0 |
| Example 6 | 190W | 0.06MPa | 5％ | 25s | 25mm | Level 0 |
| Example 7 | 200W | 0.06MPa | 6％ | 30s | 20mm | Level 0 |
| Example 8 | 190W | 0.06MPa | 6％ | 30s | 25mm | Level 0 |
| Example 9 | 190W | 0.06MPa | 6％ | 30s | 25mm | Level 0 |
| Comparative example 1 | 220W | 0.06MPa | 6％ | 30s | 25mm | Level 1 |
| Comparative example 2 | 190W | 0.08MPa | 6％ | 30s | 25mm | Level 1 |
| Comparative example 3 | 190W | 0.06MPa | 8％ | 30s | 25mm | Level 1 |
| Comparative example 4 | 190W | 0.06MPa | 6％ | 50s | 25mm | Level 1 |
| Comparative example 5 | 190W | 0.06MPa | 6％ | 30s | 50mm | Level 1 |
| Comparative example 6 | —— | —— | —— | —— | —— | Stage 2 |
As can be seen from Table 1, the adhesion between the surface of the wood and the paint film of the wood treated by the temperature programmed heat treatment and the plasma jet surface treatment of examples 1 to 9 reaches 0 grade, while the adhesion between the surface of the wood and the paint film of the wood treated by the temperature programmed heat treatment and the plasma jet surface treatment of example 6 is only 2 grade, which shows that the adhesion between the surface of the wood and the paint film of the wood treated by the temperature programmed heat treatment and the plasma jet surface treatment of the invention is greatly increased, and the adhesion between the surface of the wood and the paint film of the wood can be obviously improved by combining the temperature programmed heat treatment and the plasma jet surface treatment. Furthermore, although the adhesion of the paint film to the wood surfaces obtained in examples 1 to 9 was of the order of 0, it was observed that the paint film adhesion of the wood in example 1 was significantly better than that of the other examples. Compared with the treatment method in the comparative examples 1-5, the treatment method in the comparative examples 1-5 respectively changes the power, the working pressure, the wood water content, the treatment time and the treatment height used in the plasma jet surface treatment process, and the adhesion of the obtained wood surface to the paint film is grade 1, which shows that when the plasma jet treatment process is carried out by adjusting the power of the plasma jet treatment to 190W, the working pressure to 0.06MPa, the wood water content to 6 percent, the treatment time to 30s and the treatment height to 25mm, the adhesion of the wood surface to the paint film can be better improved by the plasma jet surface treatment of the wood.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.
Claims (7)
1. A treatment method for improving the adhesion of a larch surface to a water-based paint film comprises the following steps:
carrying out temperature programming heat treatment, and adjusting the water content of the wood to 5-7%;
plasma jet surface treatment, in which,
the working pressure of the used plasma jet processor is 0.05-0.06Mpa, and the working gas is nitrogen;
wherein the temperature-programmed heat treatment comprises the following steps,
a first temperature rise step: gradually increasing the temperature from room temperature to 120 ℃ at the speed of 15 ℃/h, and preserving the temperature for 3 h;
a second temperature rise step: introducing inert gas to keep the mass fraction of oxygen in the heat treatment chamber lower than 5%, continuously raising the temperature to 150 ℃ at the speed of 10 ℃/h, and preserving the heat for 3 h;
a third temperature rise step: continuously introducing inert gas to keep the oxygen mass fraction in the heat treatment chamber lower than 5%, raising the temperature to 240 ℃ at the speed of 10 ℃/h, and preserving the temperature for 6 h;
and a cooling step, naturally cooling the heat treatment chamber to room temperature, and adjusting the moisture content value of the wood to be 5-7% in the process.
2. The processing method according to claim 1, characterized in that:
the treatment height of the plasma jet is 15-35 mm.
3. The processing method according to claim 1, characterized in that:
the treatment time of the plasma jet is 15-45 s.
4. The processing method according to claim 1, characterized in that:
the power of the plasma jet processor is 180-200W.
5. The processing method according to claim 1, characterized in that:
the treatment height of the plasma jet was 25 mm.
6. The processing method according to claim 5, characterized in that:
the treatment time of the plasma jet was 30 s.
7. The processing method according to claim 5, characterized in that:
the water content was 6%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710091781.3A CN106926333B (en) | 2017-02-21 | 2017-02-21 | Improve processing method of the wood surface to paint film adhesion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710091781.3A CN106926333B (en) | 2017-02-21 | 2017-02-21 | Improve processing method of the wood surface to paint film adhesion |
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| Publication Number | Publication Date |
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| CN106926333A CN106926333A (en) | 2017-07-07 |
| CN106926333B true CN106926333B (en) | 2018-11-02 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107583841A (en) * | 2017-11-06 | 2018-01-16 | 湖州南浔凤强木业有限公司 | A kind of woodwork paint application technique |
| CN109333692A (en) * | 2018-09-20 | 2019-02-15 | 德华兔宝宝装饰新材股份有限公司 | A kind of method that plasma modification height emulates scientific and technological wood skin |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5143748A (en) * | 1990-10-26 | 1992-09-01 | Matsushita Electric Works, Ltd. | Timber surface improving treatment process |
| CN101224593A (en) * | 2008-02-01 | 2008-07-23 | 中国林业科学研究院木材工业研究所 | Wood heat treatment method |
| CN103194002A (en) * | 2013-05-02 | 2013-07-10 | 东北林业大学 | Synergetic surface treatment method applied to hardly adhered polyolefin-based wood-plastic composite |
| CN106217524A (en) * | 2016-07-29 | 2016-12-14 | 上海轩颂建筑科技有限公司 | A kind of preparation method of environment-friendly and high-performance bamboo flooring |
-
2017
- 2017-02-21 CN CN201710091781.3A patent/CN106926333B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5143748A (en) * | 1990-10-26 | 1992-09-01 | Matsushita Electric Works, Ltd. | Timber surface improving treatment process |
| CN101224593A (en) * | 2008-02-01 | 2008-07-23 | 中国林业科学研究院木材工业研究所 | Wood heat treatment method |
| CN103194002A (en) * | 2013-05-02 | 2013-07-10 | 东北林业大学 | Synergetic surface treatment method applied to hardly adhered polyolefin-based wood-plastic composite |
| CN106217524A (en) * | 2016-07-29 | 2016-12-14 | 上海轩颂建筑科技有限公司 | A kind of preparation method of environment-friendly and high-performance bamboo flooring |
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