CN113021548A - Bamboo hydrophobic modification treatment method - Google Patents
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- CN113021548A CN113021548A CN202110256088.3A CN202110256088A CN113021548A CN 113021548 A CN113021548 A CN 113021548A CN 202110256088 A CN202110256088 A CN 202110256088A CN 113021548 A CN113021548 A CN 113021548A
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- 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
- B27K9/00—Chemical or physical treatment of reed, straw, or similar material
- B27K9/002—Cane, bamboo
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- 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
- B27K3/0207—Pretreatment of wood before impregnation
- B27K3/0214—Drying
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- 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
- B27K3/0228—Spraying apparatus, e.g. tunnels
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- 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
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- 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
- B27K3/36—Aliphatic compounds
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- 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
- B27K3/38—Aromatic compounds
-
- 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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- 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
- B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
- B27K5/009—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C using a well-defined temperature schedule
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/61—Polysiloxanes
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- 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
- B27K2240/00—Purpose of the treatment
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- 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
- B27K2240/00—Purpose of the treatment
- B27K2240/70—Hydrophobation treatment
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- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
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- Polymers & Plastics (AREA)
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- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a bamboo hydrophobic modification treatment method, and belongs to the technical field of bamboo surface modification treatment. The bamboo hydrophobic modification treatment method comprises the steps of carrying out vacuum pressurization impregnation treatment on bamboo by using a mixed solution of hydroxyl silicone oil and diisocyanate, carrying out spraying treatment on the bamboo by using an organic tin dispersion liquid, and finally carrying out step heating treatment on the bamboo. The hydrophobic modification treatment method provided by the invention can obviously improve the hydrophobicity, the wear resistance and the dimensional stability of the bamboo wood, prevent the problems of warping deformation, mildewing and rotting and the like of the bamboo wood when the bamboo wood is used outdoors and in a humid environment, prolong the service life of the bamboo wood and have obvious economic value and social benefit.
Description
Technical Field
The invention belongs to the technical field of bamboo hydrophobic modification treatment, and particularly relates to a bamboo hydrophobic modification treatment method.
Background
The bamboo has the advantages of fast growth, high yield, early lumber production, wide application and the like, and is praised as an important non-wood forest resource. As a wood fiber raw material, bamboo has a large number of hydrophilic groups and a developed pore structure, so that the bamboo has almost no resistance to moisture. The moisture is easy to cause the phenomena of deformation, cracking, mildew, decay and the like of the bamboo, and the application range and the use period of the bamboo products are seriously influenced. Therefore, it is important to perform the hydrophobic treatment on the bamboo material in order to prevent the water from entering the bamboo material. The common bamboo wood hydrophobic treatment method comprises the following steps: etching method, deposition method, layer-by-layer self-assembly method, template method, hydrothermal method, sol-gel method, plasma treatment method, surface coating and the like. The method comprises the steps of injecting, coating and depositing a hydrophobic substance on the surface of the bamboo material, or constructing a rough binary micro-nano structure on the surface of the bamboo material by adopting a bionic thought, and further modifying the hydrophobic substance with low surface energy. However, the existing method has the defects of complex process, high production cost, poor wear resistance, fragile constructed rough structure, poor interface bonding performance of the substrate and the hydrophobic layer and the like. Therefore, the preparation of durable and wear-resistant functional hydrophobic bamboo wood by adopting a simple physical or chemical method and using widely available cheap materials has important practical significance.
Disclosure of Invention
The invention provides a bamboo hydrophobic modification treatment method aiming at the problems of easy wet swelling, warping deformation, mildewing and rotting and the like when bamboo is used in outdoor and humid environments. The hydrophobic modification treatment method provided by the invention can obviously improve the hydrophobicity, the wear resistance and the dimensional stability of the bamboo wood, prevent the problems of warping deformation, mildewing and rotting and the like of the bamboo wood when the bamboo wood is used outdoors and in a humid environment, prolong the service life of the bamboo wood and have obvious economic value and social benefit.
In order to achieve the purpose, the invention adopts the following technical scheme:
the bamboo hydrophobic modification treatment method is that the bamboo is first vacuum pressure soaked with the mixture of hydroxyl silicone oil and diisocyanate, then sprayed with organic tin dispersion liquid and finally stepped heated.
The bamboo hydrophobic modification treatment method specifically comprises the following steps:
(1) sequentially adding 1-3 g of polyether type defoaming agent, 10-100 g of hydroxyl silicone oil and 1-20 g of diisocyanate into 1000-2000 mL of ethyl acetate, and mechanically stirring at room temperature for 30-60 min to prepare a mixed solution of the polyether type defoaming agent, the hydroxyl silicone oil and the diisocyanate;
(2) placing the dried bamboo sample in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.02-0.04 MPa, maintaining the pressure for 30-60 min, injecting the mixed solution, pressurizing to 1-2 MPa, maintaining the pressure for 2-4 h, and releasing the pressure; continuously soaking for 2-6 hours at normal pressure, taking out the bamboo sample, removing surface residual liquid, and performing vacuum drying for 24 hours at room temperature to obtain a pretreated bamboo sample;
(3) uniformly spraying the pretreated bamboo sample with 1-5 wt% of organic tin dispersion liquid, wherein the spraying pressure is 0.2-0.4 MPa, the spraying time is 3-9 s, standing the sprayed pretreated bamboo sample at room temperature for 6-12 h, and carrying out step heating treatment to obtain the bamboo sample subjected to hydrophobic modification treatment, namely the finished product.
The molecular weight of the hydroxyl silicone oil is 100-10000.
The diisocyanate is any one of toluene diisocyanate, isophorone diisocyanate and diphenylmethane diisocyanate.
The organic tin is any one of dibutyltin oxide, dibutyltin dibutyrate, dibutyltin dilaurate, dibutyltin diacetate and stannous octoate.
The organic tin dispersant is ethyl acetate.
The step heating treatment is divided into a first-order heating stage and a second-order heating stage, wherein the first-order heating stage is heating to 70-90 ℃ and heat preservation is carried out for 2-4 hours, and the second-order heating stage is heating to 90-110 ℃ and heat preservation is carried out for 1-2 hours.
The invention has the following remarkable advantages:
(1) the invention generates the copolymer of hydroxyl silicone oil and diisocyanate on the surface of bamboo wood by a chemical method. The hydroxyl silicone oil component in the copolymer can form a stable hydrophobic layer on the surface of the bamboo wood, so that water molecules can be effectively prevented from entering the interior of the bamboo wood, and the hydrophobicity and the dimensional stability of the bamboo wood are improved. The diisocyanate component in the copolymer can react with hydroxyl on the bamboo fiber, so that the bonding strength of the copolymer and the bamboo is improved, the copolymer is effectively prevented from losing, and the hydrophobic stability of the bamboo is improved. The polyurethane component in the copolymer can also improve the wear resistance of bamboo.
(2) The hydrophobic modification treatment method provided by the invention can obviously improve the hydrophobicity, the wear resistance and the dimensional stability of the bamboo wood, the total dry shrinkage rate of the bamboo wood before treatment is 8.1%, the wear rate is 2.3%, the contact angles of the bamboo wood are 59.5 degrees, 56.7 degrees, 54.3 degrees, 51.4 degrees, 47.5 degrees and 45.1 degrees respectively at 0d, 1d, 3d, 7d, 14d and 28d, the total dry shrinkage rate of the bamboo wood after treatment is 1.1-1.7%, the wear rate of the bamboo wood is 0.7-1.0%, the contact angles of the bamboo wood are 146-158 degrees, 142-153 degrees, 137-146 degrees, 130-137 degrees, 126-132 degrees and 125-129 degrees respectively at 0d, 1d, 3d, 7d, 14d and 28d, and the method has obvious economic value and social benefit.
Detailed Description
The advantages and effects of the method for hydrophobic modification treatment of bamboo in this 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) Sequentially adding 1g of polyether type defoaming agent, 10g of hydroxyl silicone oil with the molecular weight of 100 and 1g of toluene diisocyanate into 1000mL of ethyl acetate, and mechanically stirring for 30min at room temperature to prepare a mixed solution of the polyether type defoaming agent, the hydroxyl silicone oil and the toluene diisocyanate;
(2) placing the dried bamboo sample in an automatic vacuum pressurization tank, vacuumizing to the vacuum degree of 0.02MPa, maintaining the pressure for 30min, injecting the mixed solution, pressurizing to 1MPa, maintaining the pressure for 4h, and releasing the pressure; continuously soaking for 2 hours at normal pressure, taking out the bamboo sample, removing surface residual liquid, and performing vacuum drying for 24 hours at room temperature to obtain a pretreated bamboo sample;
(3) uniformly spraying the pretreated bamboo sample with dibutyltin oxide dispersion liquid with the weight percentage of 1%, wherein the spraying pressure is 0.2MPa, the spraying time is 9s, standing the sprayed pretreated bamboo sample at room temperature for 12h, and carrying out step heating treatment to obtain the bamboo sample subjected to hydrophobic modification treatment, namely the finished product.
The dispersant of the dibutyltin oxide is ethyl acetate.
The step heating treatment is divided into two stages of first-order temperature rise and second-order temperature rise, wherein the first-order temperature rise stage is heating to 70 ℃ and heat preservation is carried out for 4 hours, and the second-order temperature rise stage is heating to 90 ℃ and heat preservation is carried out for 2 hours.
Example 2
(1) Sequentially adding 2g of polyether type defoaming agent, 30g of hydroxy silicone oil with the molecular weight of 1000 and 4g of isophorone diisocyanate into 1500mL of ethyl acetate, and mechanically stirring for 45min at room temperature to prepare a mixed solution of the polyether type defoaming agent, the hydroxy silicone oil and the isophorone diisocyanate;
(2) placing the dried bamboo sample in an automatic vacuum pressurization tank, vacuumizing to the vacuum degree of 0.03MPa, maintaining the pressure for 45min, injecting the mixed solution, pressurizing to 1.5MPa, maintaining the pressure for 3h, and releasing the pressure; continuously soaking for 4 hours at normal pressure, taking out the bamboo sample, removing surface residual liquid, and performing vacuum drying for 24 hours at room temperature to obtain a pretreated bamboo sample;
(3) uniformly spraying the pretreated bamboo sample with 3 wt% of dibutyltin dilaurate dispersion liquid, wherein the spraying pressure is 0.3MPa, the spraying time is 6s, standing the sprayed pretreated bamboo sample at room temperature for 9h, and carrying out step heating treatment to obtain the bamboo sample subjected to hydrophobic modification treatment, namely the finished product.
The dispersant of the dibutyltin dilaurate is ethyl acetate.
The step heating treatment is divided into two stages of first-order temperature rise and second-order temperature rise, wherein the first-order temperature rise stage is heating to 80 ℃ and heat preservation is carried out for 3 hours, and the second-order temperature rise stage is heating to 100 ℃ and heat preservation is carried out for 1.5 hours.
Example 3
(1) Sequentially adding 3g of polyether type defoaming agent, 100g of hydroxyl silicone oil with the molecular weight of 10000 and 20g of diphenylmethane diisocyanate into 2000mL of ethyl acetate, and mechanically stirring for 60min at room temperature to prepare a mixed solution of the polyether type defoaming agent, the hydroxyl silicone oil and the diphenylmethane diisocyanate;
(2) placing the dried bamboo sample in an automatic vacuum pressurization tank, vacuumizing to the vacuum degree of 0.04MPa, maintaining the pressure for 60min, injecting the mixed solution, pressurizing to 2MPa, maintaining the pressure for 2h, and releasing the pressure; continuously soaking for 6 hours under normal pressure, taking out the bamboo sample, removing surface residual liquid, and performing vacuum drying for 24 hours at room temperature to obtain a pretreated bamboo sample;
(3) uniformly spraying the pretreated bamboo sample with 5 wt% of stannous octoate dispersion liquid, wherein the spraying pressure is 0.4MPa, the spraying time is 3s, standing the sprayed pretreated bamboo sample at room temperature for 6h, and carrying out step heating treatment to obtain the bamboo sample subjected to hydrophobic modification treatment, namely the finished product.
The dispersant of the stannous octoate is ethyl acetate.
The step heating treatment is divided into two stages of first-order temperature rise and second-order temperature rise, wherein the first-order temperature rise stage is heating to 90 ℃ and heat preservation is carried out for 2 hours, and the second-order temperature rise stage is heating to 110 ℃ and heat preservation is carried out for 1 hour.
Comparative example 1
(1) Sequentially adding 2g of polyether type defoaming agent and 30g of hydroxyl silicone oil with the molecular weight of 1000 into 1500mL of ethyl acetate, and mechanically stirring for 45min at room temperature to prepare a mixed solution of the polyether type defoaming agent and the hydroxyl silicone oil;
(2) placing the dried bamboo sample in an automatic vacuum pressurization tank, vacuumizing to the vacuum degree of 0.03MPa, maintaining the pressure for 45min, injecting the mixed solution, pressurizing to 1.5MPa, maintaining the pressure for 3h, and releasing the pressure; continuously soaking for 4 hours at normal pressure, taking out the bamboo sample, removing surface residual liquid, and performing vacuum drying for 24 hours at room temperature to obtain a pretreated bamboo sample;
(3) uniformly spraying the pretreated bamboo sample with 3 wt% of dibutyltin dilaurate dispersion liquid, wherein the spraying pressure is 0.3MPa, the spraying time is 6s, standing the sprayed pretreated bamboo sample at room temperature for 9h, and performing step heating treatment to obtain the bamboo sample subjected to hydrophobic modification treatment.
The dispersant of the dibutyltin dilaurate is ethyl acetate.
The step heating treatment is divided into two stages of first-order temperature rise and second-order temperature rise, wherein the first-order temperature rise stage is heating to 80 ℃ and heat preservation is carried out for 3 hours, and the second-order temperature rise stage is heating to 100 ℃ and heat preservation is carried out for 1.5 hours.
Comparative example 2
(1) Sequentially adding 2g of polyether defoaming agent and 4g of isophorone diisocyanate into 1500mL of ethyl acetate, and mechanically stirring for 45min at room temperature to prepare a mixed solution of the polyether defoaming agent and the isophorone diisocyanate;
(2) placing the dried bamboo sample in an automatic vacuum pressurization tank, vacuumizing to the vacuum degree of 0.03MPa, maintaining the pressure for 45min, injecting the mixed solution, pressurizing to 1.5MPa, maintaining the pressure for 3h, and releasing the pressure; continuously soaking for 4 hours at normal pressure, taking out the bamboo sample, removing surface residual liquid, and performing vacuum drying for 24 hours at room temperature to obtain a pretreated bamboo sample;
(3) uniformly spraying the pretreated bamboo sample with 3 wt% of dibutyltin dilaurate dispersion liquid, wherein the spraying pressure is 0.3MPa, the spraying time is 6s, standing the sprayed pretreated bamboo sample at room temperature for 9h, and performing step heating treatment to obtain the bamboo sample subjected to hydrophobic modification treatment.
The dispersant of the dibutyltin dilaurate is ethyl acetate.
The step heating treatment is divided into two stages of first-order temperature rise and second-order temperature rise, wherein the first-order temperature rise stage is heating to 80 ℃ and heat preservation is carried out for 3 hours, and the second-order temperature rise stage is heating to 100 ℃ and heat preservation is carried out for 1.5 hours.
The bamboo samples subjected to hydrophobic modification treatment and prepared in the three groups of examples and the two groups of comparative examples are soaked in deionized water at the temperature of 80 ℃, taken out periodically (1d, 3d, 7d, 14d and 28d), wiped clean, dried and then pressed according to the literature (the continental space, the channel spring, the cost of China; the quaternized nano SiO2Research on antibacterial performance and modified bamboo hydrophobicity, forest industry 2015,42(5):22-26), performing a water contact angle test, performing a dimensional stability performance test according to GB/T1932-; a performance study of the impregnation fumigation glue permeation densified bamboo wood is carried out, Zhengzhou, Henan university, 2018) is subjected to a wear resistance test, and the test results are shown in Table 1.
Table 1 results of performance testing
The test results of the examples and the comparative examples show that the copolymer of the hydroxyl silicone oil and the diisocyanate is generated on the surface of the bamboo wood by a chemical method, so that the hydrophobicity, the wear resistance and the dimensional stability of the bamboo 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 (6)
1. A bamboo hydrophobic modification treatment method is characterized by comprising the following steps: firstly, carrying out vacuum pressurization impregnation treatment on bamboo wood by using a mixed solution of hydroxyl silicone oil and diisocyanate, then carrying out spraying treatment on the bamboo wood by using an organic tin dispersion solution, and finally carrying out step heating treatment on the bamboo wood; the method specifically comprises the following steps:
(1) sequentially adding 1-3 g of polyether type defoaming agent, 10-100 g of hydroxyl silicone oil and 1-20 g of diisocyanate into 1000-2000 mL of ethyl acetate, and mechanically stirring at room temperature for 30-60 min to prepare a mixed solution of the polyether type defoaming agent, the hydroxyl silicone oil and the diisocyanate;
(2) placing the dried bamboo sample in an automatic vacuum pressurization tank, vacuumizing until the vacuum degree is 0.02-0.04 MPa, maintaining the pressure for 30-60 min, injecting the mixed solution, pressurizing to 1-2 MPa, maintaining the pressure for 2-4 h, and releasing the pressure; continuously soaking for 2-6 hours at normal pressure, taking out the bamboo sample, removing surface residual liquid, and performing vacuum drying for 24 hours at room temperature to obtain a pretreated bamboo sample;
(3) uniformly spraying the pretreated bamboo sample with 1-5 wt% of organic tin dispersion liquid, wherein the spraying pressure is 0.2-0.4 MPa, the spraying time is 3-9 s, standing the sprayed pretreated bamboo sample at room temperature for 6-12 h, and carrying out step heating treatment to obtain the bamboo sample subjected to hydrophobic modification treatment, namely the finished product.
2. The bamboo wood hydrophobic modification treatment method according to claim 1, characterized in that: the molecular weight of the hydroxyl silicone oil is 100-10000.
3. The bamboo wood hydrophobic modification treatment method according to claim 1, characterized in that: the diisocyanate is any one of toluene diisocyanate, isophorone diisocyanate and diphenylmethane diisocyanate.
4. The bamboo wood hydrophobic modification treatment method according to claim 1, characterized in that: the organic tin is any one of dibutyltin oxide, dibutyltin dibutyrate, dibutyltin dilaurate, dibutyltin diacetate and stannous octoate.
5. The bamboo wood hydrophobic modification treatment method according to claim 1, characterized in that: the organic tin dispersant is ethyl acetate.
6. The bamboo wood hydrophobic modification treatment method according to claim 1, characterized in that: the step heating treatment is divided into a first-order heating stage and a second-order heating stage, wherein the first-order heating stage is heating to 70-90 ℃ and heat preservation is carried out for 2-4 hours, and the second-order heating stage is heating to 90-110 ℃ and heat preservation is carried out for 1-2 hours.
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Application publication date: 20210625 |