CN114260990A - Method for improving dimensional stability of fir board - Google Patents
Method for improving dimensional stability of fir board Download PDFInfo
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- CN114260990A CN114260990A CN202111606786.8A CN202111606786A CN114260990A CN 114260990 A CN114260990 A CN 114260990A CN 202111606786 A CN202111606786 A CN 202111606786A CN 114260990 A CN114260990 A CN 114260990A
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Abstract
The invention discloses a method for improving the dimensional stability of a fir board, and belongs to the technical field of fir board surface modification treatment. The method for improving the dimensional stability of the fir board comprises the steps of carrying out vacuum pressurization impregnation treatment on the fir board by using an epoxy resin solution, then carrying out spray treatment on the fir board by using a pentamethylene diamine solution, and finally carrying out spray treatment on the fir board by using an ethanol solution. The method provided by the invention can obviously improve the dimensional stability of the fir board, prevent the fir board from generating dry shrinkage or wet expansion, warping, deformation, cracking and other problems when the fir board is used in a dry and humid environment, prolong the service life of the fir board and have obvious economic value and social benefit.
Description
Technical Field
The invention belongs to the technical field of surface modification treatment of fir boards, and particularly relates to a method for improving the dimensional stability of a fir board.
Background
The Chinese fir is one of the tree species with the largest planting area in China and is an important fast-growing wood species specific to China. The fir has the advantages of high growth speed, short felling period, straight dry shape, easy processing, special fragrance, moth resistance, corrosion resistance, etc. Because of abundant resources and moderate price, the fir is widely applied to the fields of building industry, shipbuilding industry, interior decoration, furniture and the like. The fir board mainly comprises cellulose, hemicellulose and lignin. Cellulose and hemicellulose contain a large number of hydroxyl groups in the molecule, and thus, cedar has hydrophilicity. Due to the action of hydroxyl, the fir board evaporates or absorbs moisture along with the change of external temperature and humidity, generates dry shrinkage or wet expansion, causes the unstable size of the fir board, generates internal stress of the fir board, and has the problems of warping, deformation, cracking and the like, thereby limiting the application of the fir board.
Disclosure of Invention
The invention provides a method for improving the dimensional stability of a fir board, aiming at the problems of warping, deformation, cracking and the like of the fir board along with the change of external temperature and humidity. The method provided by the invention can obviously improve the dimensional stability of the fir board, prevent the fir board from generating dry shrinkage or wet expansion, warping, deformation, cracking and other problems when the fir board is used in a dry and humid environment, prolong the service life of the fir board and have obvious economic value and social benefit.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for improving the dimensional stability of a fir board comprises the steps of carrying out vacuum pressurization impregnation treatment on the fir board by using an epoxy resin solution, then carrying out spray treatment on the fir board by using a pentamethylene diamine solution, and finally carrying out spray treatment on the fir board by using an ethanol solution.
The method for improving the dimensional stability of the fir board specifically comprises the following steps:
(1) placing the dried fir sample in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.02-0.04 MPa, maintaining the pressure for 20-60 min, injecting 10-30 wt% of epoxy resin ethyl acetate solution, pressurizing to 1-2 MPa, maintaining the pressure for 2-4 h, releasing the pressure, continuously impregnating for 1-3 h under normal pressure, taking out the fir sample, and air-drying for 48h at 60 ℃ to obtain a pretreated fir sample;
(2) and (2) spraying the pretreated fir sample by using an aqueous solution of 20-40 wt% of pentamethylene diamine, wherein the spraying pressure is 0.04-0.08 MPa, the spraying time is 4-10 s, treating the sprayed pretreated fir sample by using hot air at 60-80 ℃ for 3-5 h, spraying the treated sample by using an aqueous solution of 95 wt% of ethanol, the spraying pressure is 0.1-0.3 MPa, the spraying time is 5-15 s, and finally drying the treated sample by using hot air at 60 ℃ for 24h to obtain the fir board with stable size.
The epoxy resin is bisphenol A epoxy resin, bisphenol F epoxy resin or mixed resin of bisphenol A epoxy resin and bisphenol F epoxy resin in any proportion, the molecular weight of the bisphenol A epoxy resin is 3000-7000, and the molecular weight of the bisphenol F epoxy resin is 600-1600.
The fir sample is intercepted according to GB/T1929-2009.
The invention has the following remarkable advantages:
(1) the invention utilizes the epoxy resin to coat the fir board, and can effectively avoid the situation that the fir board evaporates or absorbs moisture along with the change of the external temperature and humidity to cause the size change of the fir board. Meanwhile, hydroxyl on the fir board wood fiber can also participate in the curing reaction of the epoxy resin, so that the stability of the epoxy resin coated on the surface of the fir board is improved.
(2) The fir board prepared by the invention has good dimensional stability, the dry shrinkage is 4.6-5.7%, the wet expansion is 4.9-5.8%, the dry shrinkage resistance coefficient is 30-44%, the water absorption rate is 108-127%, the problems of dry shrinkage or wet expansion, warping, deformation, cracking and the like when the fir board is used in a dry and humid environment can be effectively prevented, and the fir board has remarkable economic value and social benefit.
Detailed Description
The advantages and effects of the method for improving the dimensional stability of the fir-wood board in the embodiment are further illustrated by several groups 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.
Example 1
(1) Placing the dried fir sample in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.02MPa, maintaining the pressure for 20min, injecting an ethyl acetate solution of 10 wt% epoxy resin, pressurizing to 1MPa, maintaining the pressure for 4h, relieving the pressure, continuously impregnating for 1h under normal pressure, taking out the fir sample, and air-drying at 60 ℃ for 48h to obtain a pretreated fir sample;
(2) and (2) spraying the pretreated fir sample by using an aqueous solution of 20 wt% of pentamethylene diamine, wherein the spraying pressure is 0.04MPa, the spraying time is 10s, treating the sprayed pretreated fir sample by using hot air at 60 ℃ for 5h, spraying the pretreated fir sample by using an aqueous solution of 95 wt% of ethanol, the spraying pressure is 0.1MPa, the spraying time is 15s, and finally drying the pretreated fir sample by using hot air at 60 ℃ for 24h to obtain the fir board with stable size.
The epoxy resin is bisphenol A epoxy resin with the molecular weight of 3000.
The fir sample is intercepted according to GB/T1929-2009.
Example 2
(1) Placing the dried fir sample in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.03MPa, maintaining the pressure for 40min, injecting an ethyl acetate solution of 20 wt% epoxy resin, pressurizing to 1.5MPa, maintaining the pressure for 3h, relieving the pressure, continuously impregnating for 2h under normal pressure, taking out the fir sample, and air-drying at 60 ℃ for 48h to obtain a pretreated fir sample;
(2) and (3) spraying the pretreated fir sample by using an aqueous solution containing 30 wt% of pentamethylene diamine, wherein the spraying pressure is 0.06MPa, the spraying time is 7s, treating the sprayed pretreated fir sample by using hot air at 70 ℃ for 4h, spraying the pretreated fir sample by using an aqueous solution containing 95 wt% of ethanol, the spraying pressure is 0.2MPa, the spraying time is 10s, and finally drying the pretreated fir sample by using hot air at 60 ℃ for 24h to obtain the fir board with stable size.
The epoxy resin is a mixed resin of bisphenol A type epoxy resin and bisphenol F type epoxy resin in a weight ratio of 1: 1, wherein the molecular weight of the bisphenol A type epoxy resin is 5000, and the molecular weight of the bisphenol F type epoxy resin is 1100.
The fir sample is intercepted according to GB/T1929-2009.
Example 3
(1) Placing the dried fir sample in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.04MPa, maintaining the pressure for 60min, injecting an ethyl acetate solution of epoxy resin with the weight percentage of 30%, pressurizing to 2MPa, maintaining the pressure for 2h, relieving the pressure, continuously impregnating for 3h under normal pressure, taking out the fir sample, and air-drying for 48h at 60 ℃ to obtain a pretreated fir sample;
(2) and (2) spraying the pretreated fir sample by using 40% by weight of aqueous solution of pentamethylene diamine, wherein the spraying pressure is 0.08MPa, the spraying time is 4s, treating the sprayed pretreated fir sample by using hot air at 80 ℃ for 3h, spraying the pretreated fir sample by using 95% by weight of aqueous solution of ethanol, the spraying pressure is 0.3MPa, the spraying time is 5s, and finally drying the pretreated fir sample by using hot air at 60 ℃ for 24h to obtain the fir board with stable size.
The epoxy resin is bisphenol F epoxy resin with the molecular weight of 1600.
The fir sample is intercepted according to GB/T1929-2009.
Comparative example 1
(1) And (3) placing the dried fir sample in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.03MPa, maintaining the pressure for 40min, injecting an ethyl acetate solution of 20 wt% epoxy resin, pressurizing to 1.5MPa, maintaining the pressure for 3h, relieving the pressure, continuously impregnating for 2h at normal pressure, taking out the fir sample, and air-drying for 48h at 60 ℃ to obtain a finished product.
The epoxy resin is a mixed resin of bisphenol A type epoxy resin and bisphenol F type epoxy resin in a weight ratio of 1: 1, wherein the molecular weight of the bisphenol A type epoxy resin is 5000, and the molecular weight of the bisphenol F type epoxy resin is 1100.
The fir sample is intercepted according to GB/T1929-2009.
The fir samples prepared in the three groups of examples and the comparative example are subjected to a dry shrinkage rate test according to GB/T1932-.
Table 1 results of performance testing
| Shrinkage (%) | Wet swelling Rate (%) | Dry shrinkage resistance coefficient (%) | Water absorption (%) | |
| China fir board | 8.2 | 7.7 | - | 195 |
| Example 1 | 5.7 | 5.8 | 30 | 127 |
| Example 2 | 4.6 | 4.9 | 44 | 108 |
| Example 3 | 5.1 | 5.3 | 38 | 116 |
| Comparative example 1 | 7.3 | 7.1 | 11 | 154 |
As can be seen from the test results of the examples and the comparative examples, the epoxy resin is coated on the surface of the fir wood in a chemical bonding manner, so that the dimensional stability of the fir wood can be obviously improved.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A method for improving the dimensional stability of a fir board is characterized by comprising the following steps: firstly, carrying out vacuum pressure impregnation treatment on the fir board by using an epoxy resin solution, then carrying out spray treatment on the fir board by using a pentamethylene diamine solution, and finally carrying out spray treatment on the fir board by using an ethanol solution; the method specifically comprises the following steps:
(1) placing the dried fir sample in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.02-0.04 MPa, maintaining the pressure for 20-60 min, injecting 10-30 wt% of epoxy resin ethyl acetate solution, pressurizing to 1-2 MPa, maintaining the pressure for 2-4 h, releasing the pressure, continuously impregnating for 1-3 h under normal pressure, taking out the fir sample, and air-drying for 48h at 60 ℃ to obtain a pretreated fir sample;
(2) and (2) spraying the pretreated fir sample by using an aqueous solution of 20-40 wt% of pentamethylene diamine, wherein the spraying pressure is 0.04-0.08 MPa, the spraying time is 4-10 s, treating the sprayed pretreated fir sample by using hot air at 60-80 ℃ for 3-5 h, spraying the treated sample by using an aqueous solution of 95 wt% of ethanol, the spraying pressure is 0.1-0.3 MPa, the spraying time is 5-15 s, and finally drying the treated sample by using hot air at 60 ℃ for 24h to obtain the fir board with stable size.
2. The method for improving the dimensional stability of fir wood panels as claimed in claim 1, wherein: the epoxy resin is bisphenol A epoxy resin, bisphenol F epoxy resin or mixed resin of bisphenol A epoxy resin and bisphenol F epoxy resin in any proportion, the molecular weight of the bisphenol A epoxy resin is 3000-7000, and the molecular weight of the bisphenol F epoxy resin is 600-1600.
3. The method for improving the dimensional stability of fir wood panels as claimed in claim 1, wherein: the fir sample is intercepted according to GB/T1929-2009.
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| CN202111606786.8A CN114260990A (en) | 2021-12-26 | 2021-12-26 | Method for improving dimensional stability of fir board |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3406038A (en) * | 1962-10-15 | 1968-10-15 | Mo Och Domsjoe Ab | Treatment of wood with a polyhydric alcohol and an alkylene oxide |
| CN101259627A (en) * | 2008-04-24 | 2008-09-10 | 中国林业科学研究院木材工业研究所 | Manufacturing method of thin saw board (China fir) laminated board |
| CN105563577A (en) * | 2015-12-18 | 2016-05-11 | 中国林业科学研究院木材工业研究所 | Method for improving mechanical stability of super-hydrophobic film on wood surface |
| CN107322741A (en) * | 2017-08-10 | 2017-11-07 | 马鞍山市谷庆门业有限公司 | A kind of China fir boarded door processing technology |
| US20170348871A1 (en) * | 2014-12-23 | 2017-12-07 | Dow Global Technologies Llc | Treated porous material |
| US20180015635A1 (en) * | 2014-12-23 | 2018-01-18 | Dow Global Technologies Llc | Treated porous material |
| CN110722652A (en) * | 2019-10-25 | 2020-01-24 | 毛克升 | Hydrophobic modification treatment method for cedar |
| US20210277244A1 (en) * | 2016-09-30 | 2021-09-09 | Dow Global Center | Treated porous material |
| US20210284845A1 (en) * | 2016-09-30 | 2021-09-16 | Xue Chen | Treated porous material |
-
2021
- 2021-12-26 CN CN202111606786.8A patent/CN114260990A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3406038A (en) * | 1962-10-15 | 1968-10-15 | Mo Och Domsjoe Ab | Treatment of wood with a polyhydric alcohol and an alkylene oxide |
| CN101259627A (en) * | 2008-04-24 | 2008-09-10 | 中国林业科学研究院木材工业研究所 | Manufacturing method of thin saw board (China fir) laminated board |
| US20170348871A1 (en) * | 2014-12-23 | 2017-12-07 | Dow Global Technologies Llc | Treated porous material |
| US20180015635A1 (en) * | 2014-12-23 | 2018-01-18 | Dow Global Technologies Llc | Treated porous material |
| CN105563577A (en) * | 2015-12-18 | 2016-05-11 | 中国林业科学研究院木材工业研究所 | Method for improving mechanical stability of super-hydrophobic film on wood surface |
| US20210277244A1 (en) * | 2016-09-30 | 2021-09-09 | Dow Global Center | Treated porous material |
| US20210284845A1 (en) * | 2016-09-30 | 2021-09-16 | Xue Chen | Treated porous material |
| CN107322741A (en) * | 2017-08-10 | 2017-11-07 | 马鞍山市谷庆门业有限公司 | A kind of China fir boarded door processing technology |
| CN110722652A (en) * | 2019-10-25 | 2020-01-24 | 毛克升 | Hydrophobic modification treatment method for cedar |
Non-Patent Citations (2)
| Title |
|---|
| 刘君良等: "酚醛树脂处理杨木、杉木尺寸稳定性分析", 《木材工业》 * |
| 王燕等: "杉木浸渍改性材的尺寸稳定性研究", 《湖南林业科技》 * |
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Application publication date: 20220401 |