CN113059642A - A kind of preparation method and application of aroma-releasing masson pine glulam - Google Patents
A kind of preparation method and application of aroma-releasing masson pine glulam Download PDFInfo
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- CN113059642A CN113059642A CN202110377447.0A CN202110377447A CN113059642A CN 113059642 A CN113059642 A CN 113059642A CN 202110377447 A CN202110377447 A CN 202110377447A CN 113059642 A CN113059642 A CN 113059642A
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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
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/10—Butting blanks of veneer; Joining same along edges; Preparatory processing of edges, e.g. cutting
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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
- B27K5/04—Combined bleaching or impregnating and drying of wood
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Abstract
The invention relates to the technical field of wood processing, in particular to a preparation method of a fragrance-releasing masson pine integrated material. The preparation method of the fragrance-releasing masson pine laminted wood comprises the following steps: (1) preparing a microcapsule suspension I; (2) preparing a microcapsule suspension II; (3) preparing a microcapsule suspension III; (4) preparing a laminated wood basic unit; (5) preparing a laminated wood: and performing finger joint and gluing on the processed basic units according to product requirements to form the fragrance-releasing masson pine integrated material. According to the invention, three kinds of plant essential oil with different functional characteristics are respectively subjected to separate microcapsule coating treatment, the plant essential oil microcapsule with high core material content is synthesized, and the size of the microcapsule is regulated to realize the efficient introduction of the plant essential oil microcapsule into the wood, so that the pinus massoniana integrated material is endowed with stable and lasting functional characteristics.
Description
Technical Field
The invention relates to the technical field of wood processing, in particular to a preparation method and application of a fragrance-releasing masson pine integrated material.
Background
The plant essential oil is a secondary metabolite of natural plants, has wide sources and various varieties, and is an environment-friendly product. The plant essential oil contains various chemical components, has various functional characteristics of oxidation resistance, bacteriostasis, medical health care, mosquito prevention, insect expelling and the like, and for example, the cinnamon and clove essential oil has excellent antibacterial and antiseptic effects; the essential oil of mint and thyme has strong mosquito repelling property; the lavender and orange flower essential oil has good health-care effects of relieving anxiety, pleasuring mood and the like. The plant essential oil is widely applied in the fields of food, cosmetics, medicine, agriculture and the like. Because plant essential oil has certain volatility and poor stability and is in a liquid flowing state, the corresponding microencapsulated powder (or suspension) product becomes a main application form. The content of the core material is an important index for measuring the plant essential oil microcapsule, and the improvement of the content of the core material is beneficial to enhancing the functional effect of the microcapsule, saving the raw materials of the wall material and realizing the controllable release of the core material. In the existing plant essential oil microcapsule synthesis technology, the core material content is not focused, or the obtained microcapsule has low core material content, and the stable synthesis technology of essential oil microcapsules with high core material content is lacked.
The plant essential oil microcapsules and the artificial forest wood are compounded to develop the fragrance-releasing wood material, so that the wood can be endowed with special effects of sterilization, health care and the like, the special aromatic odor emitted by the wood material can meet the personalized requirements of the market on wood products, and the fragrance-releasing wood material is an effective way for improving the added value of the products. However, in the prior art, the essential oil microcapsules are mainly mixed with adhesives to realize the combination of the essential oil microcapsules with wood composite materials such as plywood, particle board and the like. In the technology, the coating effect of the adhesive can block the release of essential oil in partial microcapsules and influence the fragrance release effect. And by utilizing the porous characteristic inside the wood, the essential oil microcapsules are directly introduced into the wood to prepare the fragrance-releasing wood product, so that the fragrance-releasing wood product is better in fragrance-releasing effect and stronger in product controllability.
The masson pine is one of main artificial forest tree species in south China, has high growth speed and good wood mechanical property, and is a potential raw material tree species in furniture, wood structures and other solid wood processing and utilizing industries in China. The masson pine has more knots, and high-fat materials (the wood is locally enriched with a large amount of rosin which can be seen by naked eyes) can appear at the same time. The masson pine wood is processed into standard units after the defects of knots, high-fat-content materials and the like are removed, and then the standard units are glued to form the laminated wood product, so that the method is an effective way for developing high-quality products. Meanwhile, the masson pine heartwood is formed later, the sapwood is the main material part and is easy to be eroded by the insect bacteria, and the service life of the masson pine heartwood is obviously prolonged by effective protection treatment. The essential oil microcapsule is applied to the pinus massoniana laminted wood, a new fragrance-releasing product is developed, and the use value and the additional value of the pinus massoniana artificial forest wood are further improved.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a preparation method of a fragrance-releasing masson pine integrated material, which endows the masson pine integrated material with a lasting and stable fragrance releasing effect through the synthesis of essential oil microcapsules with high core material content and the efficient introduction of the microcapsules into wood.
In order to achieve the purpose, the invention provides the following technical scheme:
the preparation method of the fragrance-releasing masson pine laminted wood comprises the following steps:
(1) preparation of microcapsule suspension I: mixing plant essential oil I, prepolymer, emulsifier and water, keeping the temperature of water bath at 35-45 ℃, and using a high-speed dispersion machine at 20000-25000 r.min-1Emulsifying and dispersing at rotating speed for 20-40min to obtain emulsion; adding a catalyst solution into the obtained emulsion,keeping the temperature for 20-30min, heating to 70-80 deg.C, reacting at constant temperature for 1.5-2.5h, centrifuging, and adding water to obtain plant essential oil microcapsule suspension I;
(2) preparation of microcapsule suspension II: preparing a plant essential oil microcapsule suspending agent II by using plant essential oil II as a raw material according to the operation of the step (1);
(3) preparation of microcapsule suspension III: preparing a plant essential oil microcapsule suspending agent III by using the plant essential oil III as a raw material according to the operation of the step (1);
(4) taking a uniform mixed solution of the microcapsule suspending agent I, II and III as a treatment solution, and performing impregnation treatment on the masson pine saplings with the water content of 8-15% by using a vacuum-pressurization treatment method; draining the soaked masson pine saplings, drying at 50-60 ℃ until the water content is less than 20%, and air-drying until the water content is 8-15% to obtain a basic unit for the laminated wood;
(5) and performing finger joint and gluing on the processed basic units according to product requirements to form the fragrance-releasing masson pine integrated material.
Preferably, the plant essential oil I in the step (1) is any one or a mixture of two of cinnamon essential oil and clove essential oil; in the step (2), the plant essential oil II is any one or a mixture of two of mint essential oil and thyme essential oil; in the step (3), the plant essential oil III is any one or a mixture of lavender essential oil and orange flower essential oil.
Preferably, in the step (1), the prepolymer is a low molecular weight melamine-urea-formaldehyde prepolymer with the mass fraction of 8-12% prepared by taking melamine, urea, formaldehyde and water as raw materials and heating the raw materials for reaction at the temperature of 60-70 ℃ for 1.0-1.5h at the pH of 8-10; wherein the amount of the raw materials of melamine, urea and formaldehyde substances satisfies the following conditions in terms of M representing melamine, U representing urea and F representing formaldehyde: f ═ 3M + 1.5U.
Preferably, in the step (1), the emulsifier is styrene-maleic anhydride sodium salt solution, and the mass fraction is 8-12%; the catalyst is potassium hydrogen phthalate solution, and the mass fraction is 9-12%.
Preferably, in the step (1), the step (2) and the step (3), the average grain diameter of the microcapsule in each plant essential oil microcapsule suspension is less than 5 mu m, and the content of the core material is more than 80 percent.
Preferably, in the step (1), the step (2) and the step (3), the mass ratio of the prepolymer: plant essential oil: emulsifier: water: the catalyst is 46-60: 8-10: 14-18: 3-21: 8-10.
Preferably, the mass fractions of the plant essential oil in the step (1), the step (2) and the step (3) are all 0.1-1.0%.
Preferably, in the step (4), the vacuum degree is-0.085-0.098 MPa, the vacuumizing time is 1.0-1.5h, the pressurizing pressure is 1.0-1.5MPa, and the pressurizing time is 1-2 h.
Preferably, the adhesive used for finger joint and glue joint in the step (5) is one of resorcinol-phenol-formaldehyde resin, polyurethane and isocyanate, and the cold pressing process parameters are as follows: the unit pressure is 0.8-1.3MPa, the glue coating amount is 100--2The pressurizing time is 1.5-3.0 h.
The invention also provides application of the preparation method of the fragrance-releasing masson pine integrated material in preparation of fragrance-releasing materials.
Compared with the prior art, the invention has the following beneficial effects:
(1) the plant essential oil is a green natural product, and belongs to a safe and environment-friendly wood protection reagent; the plant essential oil microcapsule provided by the invention has the advantages of simple synthesis process, high core material content and strong product controllability.
(2) According to the invention, three kinds of plant essential oil with different functional characteristics are respectively subjected to separate microcapsule coating treatment, the plant essential oil microcapsule with high core material content is synthesized, and the size of the microcapsule is regulated to realize efficient introduction of the plant essential oil microcapsule into the wood; and the microcapsule treatment liquid can be repeatedly used, which is beneficial to saving resources.
(3) The technical scheme adopted by the invention is realized without changing the existing laminated wood production line, only a small amount of equipment such as a microcapsule synthesis reaction kettle is needed to be added, the production process of the product is simpler, the quality controllability is strong, and the method is easy to popularize and apply in production practice.
(4) The invention endows the pinus massoniana laminated wood with the characteristics of antibiosis, corrosion prevention, mosquito repelling and health care functions, can be widely applied to the fields of furniture, buildings, indoor decoration and the like, expands the application range of products and improves the added value of the products.
Drawings
Fig. 1 shows the micro-morphology of the microcapsule of cinnamon essential oil in example 1 of the present invention.
Detailed Description
In the following, the technical solutions of the present invention will be described clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1：
2.74kg of melamine, 0.65kg of urea, 6.61kg of formaldehyde and 6.67kg of water react for 1.5h under the water bath heating condition of pH 9 and 65 ℃, and low molecular prepolymer with the mass fraction of 10 percent is obtained after the mixture is diluted by 41.69kg of water;
mixing 5.40kg prepolymer, 0.90kg cinnamon essential oil, 1.60kg styrene-maleic anhydride sodium salt solution (mass fraction is 10%) and 1.20kg water, keeping the temperature of 40 ℃ in water bath, and dispersing at 23000 r.min with a high-speed dispersion machine-1Emulsifying and dispersing for 30min at rotation speed to obtain emulsion, adding 0.90g of potassium hydrogen phthalate solution (mass fraction of 10%), keeping the temperature for 25min, heating to 75 deg.C, reacting at constant temperature for 2h, centrifuging, and adding water to obtain cortex Cinnamomi essential oil microcapsule suspension. Preparing mint essential oil and lavender essential oil microcapsule suspension based on the same process conditions; the average grain diameter of the microcapsules in each prepared plant essential oil microcapsule suspension is 4.2 mu m, and the content of the core material is 91.4 percent;
preparing plant essential oil microcapsule mixed liquor (the mass fractions of cinnamon essential oil microcapsules, mint essential oil microcapsules and lavender essential oil microcapsules are all 0.1%), performing impregnation treatment on masson pine saplings (400mm multiplied by 40mm multiplied by 20mm and the water content is 8-15%) by utilizing a vacuum-pressurization treatment method (the vacuum degree is-0.085 to-0.098) MPa, the vacuumizing time is 1h, the pressurization pressure is 1.0MPa and the pressurization time is 1h), draining the treated materials, drying at 55 ℃ until the water content is less than 20%, and performing air drying until the water content is 8-15%;
using polyurethane adhesive, with a unit pressure of 0.8MPa and a coating weight of 100 g.m-2And the gluing process with the pressing time of 1.5h is used for finger joint and glue splicing of the processed masson pine basic units into large-width boards of 1220mm multiplied by 2440mm, and the boards can be used in the fields of furniture, cabinets and interior decoration.
Example 2：
2.29kg of melamine, 1.09kg of urea, 6.62kg of formaldehyde and 6.65kg of water react for 1.5h under the water bath heating condition of pH 10 and 60 ℃, and low molecular prepolymer with the mass fraction of 8 percent is obtained after the mixture is diluted by 56.19kg of water;
mixing 6.30kg prepolymer, 1.00kg compound essential oil (0.50kg cinnamon essential oil +0.50kg flos Caryophylli essential oil), 1.40kg styrene-maleic anhydride sodium salt solution (12 wt%) and 0.30kg water, maintaining the temperature of 35 deg.C in water bath, and dispersing at 25000 r.min with high-speed disperser-1Emulsifying and dispersing for 20min under the condition of rotating speed to obtain emulsion, adding 1.00kg of hydrogen potassium phthalate solution (mass fraction is 9%), keeping the temperature for 30min, heating to 80 ℃, reacting at constant temperature for 1.5h, centrifuging, and adding water to obtain the cinnamon-clove essential oil microcapsule suspension. Preparing mint-thyme essential oil and lavender-orange flower essential oil microcapsule suspension based on the same process conditions; the average grain diameter of the microcapsules in each prepared plant essential oil microcapsule suspension is 3.9 mu m, and the content of the core material is 93.3 percent;
preparing plant essential oil microcapsule mixed liquor (the mass fractions of cinnamon-clove flower essential oil microcapsules, mint-thyme essential oil microcapsules and lavender-orange flower essential oil microcapsules are all 0.5%), performing impregnation treatment on a masson pine sapwood (400mm multiplied by 40mm multiplied by 20mm and with the water content of 8-15%) by utilizing a vacuum-pressurization treatment method (the vacuum degree is-0.085 to-0.098) MPa, the vacuumizing time is 1.5h, the pressurization pressure is 1.2MPa and the pressurization time is 1.5h), draining the treated material, drying the treated material at 50 ℃ until the water content is less than 20%, and air drying until the water content is 8-15%;
by using aqueous high molecular isocyanicAcid ester with a unit pressure of 1.3MPa and a coating weight of 200 g.m-2The gluing process with the pressurizing time of 2 hours is used for finger joint and glue splicing of the processed masson pine basic units into large-width boards with the width of 1220mm multiplied by 2440mm, and the large-width boards can be used in the fields of furniture, cabinets and interior decoration.
Example 3：
1.72kg of melamine, 1.64kg of urea, 6.64kg of formaldehyde and 6.62kg of water react for 1 hour under the water bath heating condition of pH 8 and 70 ℃, and low molecular prepolymer with the mass fraction of 12 percent is obtained after the mixture is diluted by 31.85kg of water;
mixing 4.60kg prepolymer, 0.80kg flos Caryophylli essential oil, 1.70kg styrene-maleic anhydride sodium salt solution (mass fraction is 9%) and 2.10kg water, heating in water bath at 45 deg.C, and dispersing at 20000 r.min with high speed disperser-1Emulsifying and dispersing for 40min at rotation speed to obtain emulsion, adding 0.80kg of potassium hydrogen phthalate solution (mass fraction of 12%), keeping the temperature for 20min, heating to 70 deg.C, reacting at constant temperature for 2.5h, centrifuging, and adding water to obtain flos Caryophylli essential oil microcapsule suspension. Preparing thyme essential oil and orange flower essential oil microcapsule suspension based on the same process conditions; the average grain diameter of the microcapsules in each prepared plant essential oil microcapsule suspension is 4.6 mu m, and the content of the core material is 98.6 percent;
preparing plant essential oil microcapsule mixed liquor (the mass fractions of cinnamon-clove flower essential oil microcapsules, mint-thyme essential oil microcapsules and lavender-orange flower essential oil microcapsules are all 1.0%), performing impregnation treatment on masson pine saplings (600mm multiplied by 40mm multiplied by 30mm and the water content is 8-15%) by utilizing a vacuum-pressurization treatment method (the vacuum degree is-0.085 to-0.098) MPa, the vacuumizing time is 1.5h, the pressurization pressure is 1.5MPa and the pressurization time is 2h), draining the treated materials, drying the treated materials at 60 ℃ until the water content is less than 20%, and performing air drying until the water content is 8-15%;
the resorcinol-phenol-formaldehyde resin adhesive is used, the unit pressure is 1.3MPa, and the adhesive coating amount is 250 g.m-2And the gluing process with the pressurizing time of 3 hours is used for finger joint and gluing of the processed masson pine basic units into long battens with the cross section of 100mm multiplied by 250mm, and can be used in the field of wood structure buildings.
Example 4：
2.29kg of melamine, 1.09kg of urea, 6.62kg of formaldehyde and 6.65kg of water react for 1 hour under the water bath heating condition of pH 9 and 65 ℃, and low molecular prepolymer with the mass fraction of 10 percent is obtained after the mixture is diluted by 41.62kg of water;
mixing 5.40kg prepolymer, 0.90kg compound essential oil (0.60kg cinnamon essential oil +0.30kg flos Caryophylli essential oil), 1.80kg styrene-maleic anhydride sodium salt solution (mass fraction is 8%) and 1.00kg water, maintaining temperature in water bath at 35 deg.C, and dispersing at 25000 r.min with high speed disperser-1Emulsifying and dispersing for 20min under the condition of rotating speed to obtain emulsion, adding 0.90kg of hydrogen potassium phthalate solution (mass fraction is 10%), keeping the temperature for 25min, heating to 75 ℃, reacting at constant temperature for 2.5h, centrifuging, and adding water to obtain the cinnamon-clove essential oil microcapsule suspension. Preparing mint-thyme essential oil and lavender-orange flower essential oil microcapsule suspension based on the same process conditions; the average grain diameter of the microcapsules in each prepared plant essential oil microcapsule suspension is 4.5 mu m, and the content of the core material is 96.4 percent;
preparing plant essential oil microcapsule mixed liquor (the mass fractions of cinnamon-clove flower essential oil microcapsules, mint-thyme essential oil microcapsules and lavender-orange flower essential oil microcapsules are all 0.5%), performing impregnation treatment on a masson pine sapwood (600mm multiplied by 40mm multiplied by 30mm and the water content is 8-15%) by utilizing a vacuum-pressurization treatment method (the vacuum degree is-0.085 to-0.098) MPa, the vacuumizing time is 1.5h, the pressurization pressure is 1.2MPa and the pressurization time is 1.5h), draining the treated material, drying the treated material at the temperature of 60 ℃ until the water content is less than 20%, and air drying until the water content is 8-15%;
using polyurethane adhesive, with a unit pressure of 0.8MPa and a coating weight of 100 g.m-2And the gluing process with the pressurizing time of 1.5h is used for finger joint and gluing of the treated basic units of the masson pine into long battens with the cross section of 100mm multiplied by 250mm, and the long battens can be used in the field of wood structure buildings.
Example 5: the invention discloses a plant essential oil microcapsule and a performance measurement method of a fragrance-releasing masson pine integrated material
The morphology and the micro-morphology of the microcapsule are observed by using an optical microscope and a scanning electron microscope, and the micro-morphology of the cinnamon essential oil microcapsule in example 1 is shown in figure 1.
As can be seen from figure 1, the plant essential oil microcapsule of the invention is in a more regular spherical shape and has good dispersibility.
Weighing a certain amount of the cinnamon essential oil microcapsules and the cinnamon essential oil control sample in the example 1 by using a high-precision analytical balance, putting the cinnamon essential oil microcapsules and the cinnamon essential oil control sample into a 5mL centrifugal tube, placing the tube into a 60 ℃ forced air drying oven with an opening, heating the tube at the temperature of 60 ℃ for 15 days, then weighing the tube, and calculating the release rate of the core material according to the formula (1), wherein the results are shown in the following table 1.
V＝(m1-m2)/S/t×100 (1)
In the formula: v is the volatilization rate, g.m-2·d-1；m1Initial mass, g; m is2G is the mass after volatilization; s is the area of the liquid surface, m2(ii) a t is the volatilization time, d.
Table 1 comparison of release rates of cinnamon essential oil microcapsules of example 1 of the present invention and control cinnamon essential oil
| Test specimen | Release Rate/g.m-2·d-1 | Reduction ratio |
| Cinnamon essential oil | 265.7 | — |
| Microcapsules | 7.9 | 33.6 |
Note: the rate of decrease is the ratio of the release rate of the microcapsule sample to the release rate of the control.
As can be seen from table 1, after the cinnamon essential oil is coated by the microcapsule, the release rate is significantly reduced under the barrier action of the melamine-urea-formaldehyde resin wall material, the reduction ratio reaches 33.6 times, and the release time is significantly prolonged. This confirms that the microcapsule coating treatment is an effective way to reduce the release rate of the plant essential oil and realize long-acting slow release thereof.
The diameter of the individual microcapsules was measured using an optical microscope and image processing software, and at least 200 samples were taken for analysis to obtain the average particle size of the microcapsules. The core material content of the microcapsule and the average microcapsule drug loading rate of the pinus massoniana laminted wood are measured by using ethanol extraction and an ultraviolet spectrophotometer method, and the obtained results are shown in the following table 2.
TABLE 2 comparison of particle size, core content and drug loading rate in Pinus massoniana integrated material for microcapsules of the present invention and control microcapsules
Note: the remaining process parameters of control 1 and control 2 were the same as in example 2.
As can be seen from Table 2, the plant essential oil microcapsules of the present invention have small particle size (average particle size <5 μm), which facilitates the plant essential oil microcapsules to smoothly enter the interior of wood through the wood pore channels such as tracheids and pores during the vacuum-pressure treatment process. With the increase of the total mass fraction of the microcapsules in the treatment fluid, the average drug loading rate of the microcapsules in the pinus massoniana laminwood is correspondingly increased. When the microcapsule particle size is increased to 9.6 μm (control 1) and 20.3 μm (control 2), the drug loading rate in the pinus massoniana laminwood is reduced by 37.8% and 80.0%, respectively, and the introduction efficiency in wood is significantly reduced. The average particle size of the plant essential oil microcapsules tends to decrease with the increase of the emulsifying rotating speed. Meanwhile, the plant essential oil microcapsule has a high core material content (> 80%), and is beneficial to realizing the sustained release of the plant essential oil.
In conclusion, the fragrance-releasing masson pine integrated material with multiple functional characteristics of antibiosis, corrosion prevention, mosquito repelling, health care and the like is prepared by synthesizing the plant essential oil microcapsules with high core material content, regulating the size of the microcapsules and efficiently introducing the microcapsules into wood. The release of the plant essential oil in the laminated wood can be accelerated along with the increase of the temperature and the wind speed in the external environment, so that the proper microcapsule drug loading rate needs to be selected according to the use environment of the product. The drug loading of microcapsules in the laminate used indoors or at lower ambient temperatures can be relatively low (see example 1), while the laminate used outdoors or at higher ambient temperatures should have a higher drug loading of microcapsules (see example 3).
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. The preparation method of the fragrance-releasing masson pine laminated wood is characterized by comprising the following steps of:
(1) preparation of microcapsule suspension I: mixing plant essential oil I, prepolymer, emulsifier and water, keeping the temperature of water bath at 35-45 ℃, and using a high-speed dispersion machine at 20000-25000 r.min-1Emulsifying and dispersing at rotating speed for 20-40min to obtain emulsion; adding catalyst solution into the obtained emulsion, keeping the temperature for 20-30min, heating to 70-80 deg.C, reacting at constant temperature for 1.5-2.5h, centrifuging, and adding water to obtain plant essential oil microcapsule suspension I;
(2) preparation of microcapsule suspension II: preparing a plant essential oil microcapsule suspending agent II by using plant essential oil II as a raw material according to the operation of the step (1);
(3) preparation of microcapsule suspension III: preparing a plant essential oil microcapsule suspending agent III by using the plant essential oil III as a raw material according to the operation of the step (1);
(4) preparing a laminated wood basic unit: taking a uniform mixed solution of the microcapsule suspending agent I, II and III as a treatment solution, and performing impregnation treatment on the masson pine saplings with the water content of 8-15% by using a vacuum-pressurization treatment method; draining the soaked masson pine saplings, drying at 50-60 ℃ until the water content is less than 20%, and air-drying until the water content is 8-15% to obtain a basic unit for the laminated wood;
(5) preparing a laminated wood: and performing finger joint and gluing on the processed basic units according to product requirements to form the fragrance-releasing masson pine integrated material.
2. The method for preparing the flavor-releasing masson pine laminted wood according to claim 1, wherein the plant essential oil I in the step (1) is any one or a mixture of two of cinnamon essential oil and clove essential oil; in the step (2), the plant essential oil II is any one or a mixture of two of mint essential oil and thyme essential oil; in the step (3), the plant essential oil III is any one or a mixture of lavender essential oil and orange flower essential oil.
3. The method for preparing the flavor-releasing masson pine laminted wood according to claim 1, wherein in the step (1), the prepolymer is a low molecular weight melamine-urea-formaldehyde prepolymer with the mass fraction of 8-12% which is prepared by taking melamine, urea, formaldehyde and water as raw materials and reacting for 1.0-1.5h under the heating condition of 60-70 ℃ and the pH of 8-10; wherein the amount of the raw materials of melamine, urea and formaldehyde substances satisfies the following conditions in terms of M representing melamine, U representing urea and F representing formaldehyde: f ═ 3M + 1.5U.
4. The method for preparing the flavor-releasing masson pine laminted wood according to claim 1, wherein the emulsifier in the step (1) is styrene-maleic anhydride sodium salt solution, and the mass fraction is 8-12%; the catalyst is potassium hydrogen phthalate solution, and the mass fraction is 9-12%.
5. The method for preparing the flavor-releasing masson pine laminted wood according to claim 1, wherein in the step (1), the step (2) and the step (3), the average grain diameter of the microcapsule in each plant essential oil microcapsule suspension is less than 5 μm, and the content of the core material is more than 80%.
6. The method for preparing the flavor-releasing masson pine laminted wood according to claim 1, wherein in the step (1), the step (2) and the step (3), the mass ratio of prepolymer: plant essential oil: emulsifier: water: the catalyst is 46-60: 8-10: 14-18: 3-21: 8-10.
7. The method for preparing the flavor-releasing masson pine laminted wood according to claim 1, wherein the mass fractions of the plant essential oil in the step (1), the step (2) and the step (3) are all 0.1-1.0%.
8. The method for preparing the flavor-releasing masson pine laminted wood according to claim 1, wherein the vacuum degree in the step (4) is-0.085-0.098 MPa, the vacuumizing time is 1.0-1.5h, the pressurizing pressure is 1.0-1.5MPa, and the pressurizing time is 1-2 h.
9. The method for preparing the flavor-releasing masson pine laminted wood according to claim 1, wherein the adhesive used for finger joint and glue joint in the step (5) is one of resorcinol-phenol-formaldehyde resin, polyurethane and isocyanate, and the cold pressing process parameters are as follows: the unit pressure is 0.8-1.3MPa, the glue coating amount is 100--2The pressurizing time is 1.5-3.0 h.
10. The use of the method of any one of claims 1-9 for the preparation of a scent releasing material.
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