CN114770680A - Safe and environment-friendly novel method for chemically dipping and modifying cedar - Google Patents
Safe and environment-friendly novel method for chemically dipping and modifying cedar Download PDFInfo
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- CN114770680A CN114770680A CN202210458198.2A CN202210458198A CN114770680A CN 114770680 A CN114770680 A CN 114770680A CN 202210458198 A CN202210458198 A CN 202210458198A CN 114770680 A CN114770680 A CN 114770680A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000007598 dipping method Methods 0.000 title claims abstract description 18
- 241000218645 Cedrus Species 0.000 title claims description 12
- 239000002023 wood Substances 0.000 claims abstract description 63
- 238000005470 impregnation Methods 0.000 claims abstract description 40
- 239000000126 substance Substances 0.000 claims abstract description 17
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 15
- 239000004626 polylactic acid Substances 0.000 claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 14
- JJTUDXZGHPGLLC-UHFFFAOYSA-N lactide Chemical compound CC1OC(=O)C(C)OC1=O JJTUDXZGHPGLLC-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000011065 in-situ storage Methods 0.000 claims abstract description 9
- 239000011259 mixed solution Substances 0.000 claims abstract description 9
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 claims abstract description 8
- 230000004048 modification Effects 0.000 claims description 13
- 238000012986 modification Methods 0.000 claims description 13
- 238000001291 vacuum drying Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 claims description 3
- 240000005020 Acaciella glauca Species 0.000 claims description 2
- 241000218657 Picea Species 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 235000003499 redwood Nutrition 0.000 claims description 2
- 241001116498 Taxus baccata Species 0.000 claims 1
- 238000007654 immersion Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 abstract description 6
- 238000010923 batch production Methods 0.000 abstract description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 abstract description 2
- 231100000252 nontoxic Toxicity 0.000 abstract description 2
- 230000003000 nontoxic effect Effects 0.000 abstract description 2
- 230000002194 synthesizing effect Effects 0.000 abstract description 2
- 125000004122 cyclic group Chemical group 0.000 abstract 2
- 244000050510 Cunninghamia lanceolata Species 0.000 description 6
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 239000011148 porous material Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229920000877 Melamine resin Polymers 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- RCHKEJKUUXXBSM-UHFFFAOYSA-N n-benzyl-2-(3-formylindol-1-yl)acetamide Chemical compound C12=CC=CC=C2C(C=O)=CN1CC(=O)NCC1=CC=CC=C1 RCHKEJKUUXXBSM-UHFFFAOYSA-N 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000004584 weight gain Effects 0.000 description 2
- 235000019786 weight gain Nutrition 0.000 description 2
- 235000017894 Abies grandis Nutrition 0.000 description 1
- 244000178606 Abies grandis Species 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/08—Impregnating by pressure, e.g. vacuum impregnation
-
- 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
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
-
- 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
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/34—Organic impregnating agents
- B27K3/50—Mixtures of different organic impregnating agents
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a safe and environment-friendly novel method for chemically dipping and modifying fir, which comprises the steps of carrying out cyclic dipping treatment on fir wood blocks by providing a negative pressure-dipping lactide/stannous octoate/fir wood block mixed solution-releasing negative pressure method, and taking out the wood blocks after the treatment for in-situ synthesis. Wherein the mass ratio of lactide and stannous octoate used for synthesizing polylactic acid is 2000: 1. The invention adopts the green degradable polylactic acid to impregnate the fir, which is non-toxic and harmless to human body and environment; after in-situ synthesis of polylactic acid, grafting the polylactic acid to a wood cell cavity through carboxyl to realize chemical impregnation; by adopting a new method of firstly dipping and then in-situ synthesis, the dipping efficiency of the fir wood and the cyclic utilization rate of the dipping solution are improved; the negative pressure-negative pressure releasing impregnation mode is adopted, so that the safety of the impregnation process and the feasibility of batch production are improved.
Description
The technical field is as follows:
the invention belongs to the technical field of chemical enhancement modification of wood, and relates to a safe and environment-friendly novel method for chemically dipping and modifying Chinese fir, in particular to a safe and environment-friendly novel method for dipping and modifying Chinese fir by degradable polylactic acid.
Background art:
as a natural biomass material with rich reserves, good biocompatibility, biodegradability, environmental protection, low cost and easy processing, the wood has rich, fine, complex and hierarchical porous structure and has the characteristics of anisotropy, low density, high elasticity, excellent mechanical property and the like. In particular, the longitudinally aligned tube hole configuration, which serves both moisture and nutrient transport, provides a natural tube structure for fluid absorption. The fir wood contains abundant micro-nano pore canals inside, and provides natural capillary action for nutrient substances. The fir wood has the advantages of easy processing, good dimensional stability, toughness, lightness, low oil content, economy, practicality and the like. However, in a high-temperature environment, the fir wood is fragile, not only is not collision-resistant, but also is easy to deform, and the fir wood is soft, so that cracks which are difficult to repair are caused due to the fact that the routine cleaning and nursing are not good. The impregnation modification of the fir wood can improve the properties of the fir wood such as dimensional stability, mechanical strength, heat resistance and the like, and expand the application field of the fir wood in the aspects of buildings, furniture, decoration and the like.
At present, the modification of low molecular weight resin such as urea-formaldehyde resin, melamine formaldehyde resin, phenolic resin and the like is mostly studied at home and abroad, but the color of wood is deepened by the modification treatment, and aldehyde resin can release formaldehyde gas to hurt the health of human bodies, so that the application range of the phenolic resin modified wood is limited. In the existing impregnation methods, physical impregnation is mostly adopted, and various problems such as unstable chemical properties, chemical leakage and the like are easily caused. In the current research, all the resins required for impregnation impregnate wood after polymerization, but the polymerized resins are gradually connected by small molecular monomers to form macromolecular chains or macromolecular structures with branched chains, so that the impregnation process is difficult to realize. Therefore, many scholars focus on expanding the pore structure of wood to improve and expand the pore structure of wood by removing hemicellulose or lignin in wood, but the effect of wood impregnation is slightly improved by expanding the pore structure at the nano level, and the steps of the manufacturing process are increased, which has adverse effect on the mass production of the expanded industrial chain. During the impregnation process, most researchers mainly adopt a negative pressure-normal pressure-pressurization mode to press the wood into the impregnation liquid for impregnation treatment, and the impregnation mode is helpful for increasing the impregnation efficiency and increasing the weight gain rate of the wood, but the operation process has certain dangerousness and the explosion can occur by carelessness.
In view of the above circumstances, there is an urgent need to develop a new method for chemically impregnating and modifying cedarwood, which is safe and environment-friendly, so as to improve the problem of chemical leakage caused by physical impregnation, improve impregnation efficiency, avoid the problem of environmental pollution caused by impregnated wood, improve the safety of the impregnation process, and solve the key technical problem of impregnated wood.
The invention content is as follows:
the invention aims to overcome the defects of the existing impregnation process and provide a negative pressure-releasing negative pressure repeated circulating type safe impregnation process and treatment steps of impregnation first and synthesis, so as to improve the impregnation efficiency, the chemical stability, the environmental protection, the safety of the impregnation process, the feasibility of batch production and the recycling property of impregnation liquid of wood.
In order to solve the technical problems, the invention adopts the following technical scheme.
The method is a method for carrying out negative pressure-negative pressure release repeated circulating impregnation treatment and then taking out fir wood blocks for in-situ synthesis to obtain the green and environment-friendly impregnated modified fir.
Preferably, the method comprises the following steps:
(1) uniformly mixing raw materials of lactide and stannous octoate in a beaker, immersing the cedar wood block in a mixed solution, placing the beaker in a constant-temperature vacuum drying oven, vacuumizing to keep negative pressure, and releasing the negative pressure after the mixed solution fully enters the wood block. Repeating the process to carry out impregnation treatment;
(2) taking out the impregnated wood blocks, wiping off surface liquid, placing in a constant-temperature vacuum drying oven, vacuumizing and maintaining negative pressure, and carrying out in-situ synthesis treatment;
(3) and taking out the synthesized wood block, and curing to obtain the safe and environment-friendly polylactic acid impregnated modified fir.
Preferably, the mass ratio of the lactide to the stannous octoate is 2000: 1. The temperature of the dipping treatment is 95-120 ℃, the temperature of the synthesis treatment is 140-180 ℃, and the synthesis time is 3 h.
Preferably, the fir wood comprises one or more of spruce, redwood and yellow fir.
Preferably, in the step (1) or the step (2), the vacuum is pumped to-0.09 MPa to-0.1 MPa, the negative pressure is kept for 15-30min, and the negative pressure is released to the atmospheric pressure and kept for 5 min.
Preferably, in the step (1), the cycle number is 2-4.
Preferably, in the step (2), the curing temperature is room temperature, and the curing time is 10-20 min.
Compared with the prior art, the invention has the advantages that:
(1) the invention provides a safe and environment-friendly novel method for chemically dipping and modifying Chinese fir, which realizes the chemical enhancement and modification of the Chinese fir. The traditional low molecular weight resin has long molecular chain and low impregnation efficiency, so that the impregnation time is prolonged, and the impregnation effect is poor; according to the invention, the lactide monomer is firstly immersed into the pore structure of the wood, and is taken out for in-situ synthesis, so that the impregnation efficiency of the wood can be obviously improved.
(2) The method adopts the method of dipping first and then taking out the wood blocks for in-situ synthesis, thereby improving the recycling rate of the dipping solution.
(3) Physical impregnation is prone to problems such as unstable chemical properties and chemical leakage. The invention adopts chemical impregnation, and utilizes the reaction of carboxyl in polylactic acid molecular chains and hydroxyl contained in wood to realize chemical impregnation.
(4) The traditional low molecular weight resin modification, such as urea-formaldehyde resin, melamine formaldehyde resin, phenolic resin and the like, deepens the color of wood through modification treatment, and formaldehyde gas can be released by aldehyde resin to hurt human health. The invention uses degradable nontoxic pollution-free polylactic acid modified fir, which does not affect human body and environment and is environment-friendly.
(5) The invention adopts a negative pressure-negative pressure releasing circulating dipping method, compared with the pressurizing step, the method improves the safety in the experimental process and has no explosion danger.
(6) The invention can realize the dipping and synthesizing process by adopting a common constant-temperature vacuum drying oven, has low requirement on instruments and provides possibility for batch production of modified wood.
Description of the drawings:
FIG. 1 is a photograph of a fir wood used in a new method for chemically impregnating and modifying a fir wood in an embodiment of the invention.
FIG. 2 is a photograph of a new safe and environmentally friendly method for chemically impregnating modified fir wood.
The specific implementation mode is as follows:
the materials and equipment used in the following examples are commercially available.
Example 1
A safe and environment-friendly novel method for chemically impregnating and modifying cedar as shown in figure 1 comprises the following steps:
(1) accurately weighing 20g of lactide in a beaker, placing the beaker in a constant-temperature vacuum drying oven at 120 ℃, adding 0.01g of stannous octoate solution after the lactide is changed into transparent solution from solid, and uniformly stirring. Completely immersing the Chinese fir wood blocks with the size of 25mm multiplied by 3mm in the mixed solution, firstly vacuumizing to-0.09 MPa, and keeping the negative pressure for 15min, releasing the negative pressure to the atmospheric pressure after the mixed solution fully enters the wood blocks, and keeping the negative pressure for 5 min. Repeating the process for 1h for impregnation treatment;
(2) taking out the impregnated wood blocks, wiping off surface liquid, placing in a constant-temperature vacuum drying oven at 140 ℃, vacuumizing to-0.09 MPa, keeping the negative pressure for 3 hours, and performing synthesis treatment;
(3) and taking out the synthesized fir wood blocks, and curing at normal temperature and normal pressure to obtain the safe and environment-friendly polylactic acid chemical impregnation modified fir.
Performance test
The results of testing the properties of example 1 and the unmodified wood are shown in table 1. As can be seen from the data in the table, the density and the weight gain rate of the fir wood after the polylactic acid modification are obviously improved, thereby indicating that the polylactic acid is successfully impregnated into the wood.
TABLE 1 comparison of polylactic acid modified Wood Properties
Example 2
A safe and environment-friendly novel method for chemically dipping and modifying fir comprises the following steps:
(1) accurately weighing 20g of lactide in a beaker, placing the beaker in a constant-temperature vacuum drying oven at 120 ℃, adding 0.01g of stannous octoate solution after the lactide is changed into transparent solution from solid, and uniformly stirring. Completely immersing the Chinese fir wood blocks with the size of 25mm multiplied by 3mm in the mixed solution, firstly vacuumizing to-0.09 MPa, and keeping the negative pressure for 30min, releasing the negative pressure to the atmospheric pressure after the mixed solution fully enters the wood blocks, and keeping the negative pressure for 5 min. Repeating the process for 1h for impregnation treatment;
(2) taking out the impregnated wood blocks, wiping off surface liquid, placing in a constant-temperature vacuum drying oven at 140 ℃, vacuumizing to-0.09 MPa, keeping the negative pressure for 3 hours, and performing synthesis treatment;
(3) and taking out the synthesized fir wood blocks, and curing at normal temperature and normal pressure to obtain the safe and environment-friendly polylactic acid chemical impregnation modified fir.
Performance testing
The results of testing the properties of example 2 and the unmodified wood are shown in table 2.
TABLE 2 comparison of polylactic acid modified Wood Properties
The above description is of the preferred embodiment of the invention and is not intended to limit the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many variations and modifications to the disclosed embodiments, or equivalent variations, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modifications, equivalent substitutions, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are within the scope of the technical scheme of the present invention.
Claims (7)
1. A safe and environment-friendly novel method for chemically dipping and modifying fir is characterized by comprising the following steps:
(1) uniformly mixing lactide and stannous octoate in a beaker, adding the cedar wood block, immersing the cedar wood block in a mixed solution, placing the beaker in a constant-temperature vacuum drying oven, vacuumizing to keep negative pressure, releasing the negative pressure after the mixed solution is fully immersed in the wood block, and repeating the process to perform immersion treatment;
(2) taking out the impregnated wood blocks, wiping off surface liquid, placing in a constant-temperature vacuum drying oven, vacuumizing and maintaining negative pressure, and carrying out in-situ synthesis treatment;
(3) and taking out the synthesized wood block, and curing to obtain the safe and environment-friendly polylactic acid chemical impregnation modified fir.
2. The new safe and environment-friendly method for chemically impregnating and modifying the cedar wood as claimed in claim 1, wherein the cedar wood comprises one or more of spruce, redwood and yew.
3. The new safe and environment-friendly method for chemical impregnation modification of cedar as claimed in claim 1, wherein the mass ratio of lactide to stannous octoate is 2000: 1.
4. The novel safe and environment-friendly method for chemically impregnating and modifying the cedar as claimed in claim 1, wherein the temperature of the circulating impregnation treatment is 95-120 ℃, the temperature of the in-situ synthesis treatment is 140-.
5. The new safe and environment-friendly method for chemically impregnating and modifying cedarwood according to claim 1, wherein in the step (1) or the step (2), the vacuum is pumped to-0.09 MPa to-0.1 MPa, the negative pressure is maintained for 15-30min, and the negative pressure is released to the atmospheric pressure and is maintained for 5 min.
6. The new method for the chemical impregnation modification of cedar wood with safety and environmental protection as claimed in claim 1, wherein the number of cycles in step (1) is 2-4.
7. The new safe and environment-friendly method for chemically impregnating and modifying cedar as claimed in claim 1, wherein in the step (2), the curing temperature is room temperature and the curing time is 10-20 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210458198.2A CN114770680A (en) | 2022-04-27 | 2022-04-27 | Safe and environment-friendly novel method for chemically dipping and modifying cedar |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210458198.2A CN114770680A (en) | 2022-04-27 | 2022-04-27 | Safe and environment-friendly novel method for chemically dipping and modifying cedar |
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| Publication Number | Publication Date |
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| CN114770680A true CN114770680A (en) | 2022-07-22 |
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| CN202210458198.2A Pending CN114770680A (en) | 2022-04-27 | 2022-04-27 | Safe and environment-friendly novel method for chemically dipping and modifying cedar |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109016000A (en) * | 2018-09-13 | 2018-12-18 | 湘南学院 | A kind of method that phenolic resin strengthens wood of Cunninghamia lanceolata |
| CN109137522A (en) * | 2017-06-16 | 2019-01-04 | 赵云飞 | A kind of preparation method of the sisal fiber of modification |
| CN110497493A (en) * | 2019-09-29 | 2019-11-26 | 中南林业科技大学 | The method of organic impregnation modified artificial forest wood |
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- 2022-04-27 CN CN202210458198.2A patent/CN114770680A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109137522A (en) * | 2017-06-16 | 2019-01-04 | 赵云飞 | A kind of preparation method of the sisal fiber of modification |
| CN109016000A (en) * | 2018-09-13 | 2018-12-18 | 湘南学院 | A kind of method that phenolic resin strengthens wood of Cunninghamia lanceolata |
| CN110497493A (en) * | 2019-09-29 | 2019-11-26 | 中南林业科技大学 | The method of organic impregnation modified artificial forest wood |
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Application publication date: 20220722 |