Preparation method of slow-release wear-resistant fragrance-releasing ecological board

Abstract

The application discloses a preparation method of a slow-releasing wear-resistant fragrance-releasing ecological board and belongs to the field of wood processing and manufacturing, and comprises the following steps: coating urea-formaldehyde resin glue on both sides of a base material; pasting eucalyptus veneers on both sides of the glued base material, and sequentially performing cold pressing and hot pressing; coating urea-formaldehyde resin glue on one side of a technology veneer, then covering a fragrance-releasing impregnated glue film paper, and hot pressing and shaping; taking two hot-pressed and shaped technology veneers, coating urea-formaldehyde resin glue on the other side of each technology veneer, pasting the technology veneers on the other sides of the eucalyptus veneers, and hot pressing to obtain the slow-releasing wear-resistant fragrance-releasing ecological board. The method can effectively delay the fragrance-releasing time of the fragrance-releasing ecological board and reduce the influence of the addition of microcapsules on the physical and mechanical properties of the board.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wood processing and manufacturing, in particular to a preparation method of a slow-release wear-resistant fragrance-releasing ecological board. BACKGROUND

[0002] In recent years, with the improvement of living standards and health awareness, people have higher and higher expectations for the added value of home products. Due to the influence of manufacturing process, the widely used wood-based panel materials in home products often have bad odor, which is not conducive to the physical and mental health of human body when stored in indoor environment for a long time. The addition of aromatic substances has obvious odor improvement effect on wood-based panel materials. However, the preparation of wood-based panel for home use needs to go through high temperature and high pressure process conditions. Therefore, the aromatic substances are usually treated by microcapsulation before being added into the wood-based panel. In this way, the high molecular material is polymerized into a film by physical or chemical methods to wrap the oil droplets, so as to reduce the heat loss of aromatic substances due to high temperature. At present, although there is an application of aromatic microcapsulation technology in ecological board, the slow-release effect of the existing fragrance-releasing board is not good due to the influence of the particle size and wall material of the microcapsules, and the surface wear resistance, surface scratch resistance and surface bonding strength of the board are all reduced to a certain extent.

[0003] Therefore, it is a technical problem to be solved by those skilled in the art to provide a preparation method of slow-release wear-resistant fragrance-releasing ecological board, which can effectively delay the fragrance-releasing time of the fragrance-releasing ecological board and reduce the influence of the addition of microcapsules on the physical and mechanical properties of the board. SUMMARY

[0004] Therefore, the present application provides a preparation method of slow-release wear-resistant fragrance-releasing ecological board.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A preparation method of slow-release wear-resistant fragrance-releasing ecological board, comprising the following steps:

[0007] (1) Coating urea-formaldehyde resin glue on both sides of the base material to obtain a glue-coated base material;

[0008] (2) Attaching eucalyptus veneers on both sides of the glue-coated base material, and then performing cold pressing and hot pressing in sequence;

[0009] (3) Taking a piece of technology wood veneer, coating urea-formaldehyde resin glue on one side of the technology wood veneer, and then covering a fragrance-releasing impregnated glue film paper, and hot pressing to shape;

[0010] (4) Taking two pieces of technology wood veneers shaped by hot pressing in step (3), coating urea-formaldehyde resin glue on the other side of the technology wood veneers, and attaching the technology wood veneers on the other side of the eucalyptus veneers in step (2), and then hot pressing to obtain a slow-release wear-resistant fragrance-releasing ecological board.

[0011] Further, in the scheme of the present application, the urea-formaldehyde resin glue can be replaced by any other glue with the same function and effect.

[0012] Further, the substrate in step (1) is any one of solid wood board, artificial board, wood composite material board, wood fiber board;

[0013] The substrate can also be selected from acacia wood board, larch board, eucalyptus board, fast-growing poplar board, big blue poplar board, oriented structural particle board, poplar veneer, Chinese fir composite floor, etc.

[0014] The single-side urea-formaldehyde resin glue coating amount of the substrate is 80-150g / m 2 .

[0015] Further, the eucalyptus veneer in step (2) can be replaced by poplar veneer.

[0016] Further, the cold pressing pressure in step (2) is 0.1-3MPa, and the cold pressing time is 0.1-2h; the hot pressing pressure is 1-2MPa, the hot pressing temperature is 95-125℃, and the hot pressing time is 3-5min.

[0017] Preferably, the cold pressing pressure is 0.3MPa, the cold pressing time is 2h; the hot pressing pressure is 1.0MPa, the hot pressing temperature is 125℃, and the hot pressing time is 5min

[0018] Further, the preparation method of the fragrance-releasing impregnated glue film paper in step (3) is as follows: mixing fragrance microcapsules and melamine-formaldehyde glue water, impregnating the decorative paper with urea-formaldehyde resin glue, then secondary gluing in the mixed solution of the mixed fragrance microcapsules and melamine-formaldehyde glue water, and then drying in a 120℃ oven for 3.5min to obtain the fragrance-releasing impregnated glue film paper.

[0019] Further, the mass ratio of the fragrance microcapsules to melamine-formaldehyde glue water is 5:95.

[0020] Further, the preparation method of the fragrance microcapsules is as follows:

[0021] 1) 10 parts by weight of citron essential oil and 50 parts by weight of lauryl phosphate ester are mixed, put into a homogenizing emulsifier, ultrasonically emulsified at 40w power for 30min, and then the pH of the obtained emulsion is adjusted to neutral using triethanolamine to obtain a citron essential oil emulsion;

[0022] 2) Mix 50 parts by weight of citron essential oil emulsion, 50 parts by weight of gelatin solution, and 50 parts by weight of gum arabic solution. Adjust the pH of the mixed solution to 4.1 and place it in a sand bath at 40°C and stir for 30 minutes. After removing it, let the solution cool and adjust its pH to 6. Then add 5 parts by weight of transglutaminase and place it in an environment below 5°C for low-temperature curing. Use a separatory funnel to separate the aqueous phase and emulsion phase of the citron essential oil microcapsule suspension to obtain fragrance microcapsules.

[0023] Furthermore, the triethanolamine has a mass concentration of 30%; the gelatin solution has a mass concentration of 2%; and the gum arabic solution has a mass concentration of 2%.

[0024] The beneficial effects of adopting the above-described further solutions are as follows: the solutions of the present invention emphasize the potential of microencapsulation technology in adding multifunctional properties such as fragrance to traditional flooring materials, making them more attractive for residential and commercial applications. The microcapsule preparation method of the present invention can be integrated into existing production processes with minimal disruption.

[0025] The microcapsules of this invention maintain their core-shell structure during manufacturing, ensuring the fragrance remains intact and is gradually released over time. Lavender microcapsules showed an 85% fragrance release rate within the first 48 hours, after which the release rate slows and continues. Chemical composition analysis by FTIR also confirmed the stability of the lavender fragrance within the microcapsules. SEM images showed that the microcapsules were uniformly dispersed throughout the coating, indicating no damage during application. The microcapsules can withstand the physical and thermal stresses during flooring production.

[0026] Furthermore, the urea-formaldehyde resin adhesive applied in steps (3) and (4) of this invention can be replaced with polyamide-formaldehyde resin, polyurethane-based adhesive or soybean-based adhesive.

[0027] The coating amount is 50-200g / m2.

[0028] Furthermore, the hot pressing temperature in step (3) is 95-125℃, the hot pressing pressure is 1-2MPa, and the hot pressing time is 3-5min.

[0029] Furthermore, the hot pressing temperature in step (4) is 95-125℃, the hot pressing pressure is 1-2MPa, and the hot pressing time is 3-5min.

[0030] Furthermore, the amount of adhesive applied to the engineered wood veneer in step (4) is 150-220 g / m². 2 .

[0031] The beneficial effects of this invention are as follows: The improved sustained-release effect of this invention is mainly due to the double-walled microcapsule structure formed by lauryl phosphate and gelatin-gum arabic. Lauryl phosphate has good surface activity and heat resistance. After mixing and emulsifying it with citron essential oil, the essential oil can be evenly dispersed and a single-walled structure with good thermal stability can be formed. The secondary encapsulation of gelatin and gum arabic enables the citron essential oil microcapsules to form a double-walled structure. After cross-linking and curing with transglutaminase, the thermal stability of the microcapsules can be further improved. Applying the obtained citron essential oil microcapsules to the ecological board to obtain the fragrance-releasing ecological board can effectively delay the fragrance release time of the fragrance-releasing ecological board, reduce the residual amount of citron essential oil within 90 days, and reduce the impact of microcapsule addition on the physical and mechanical properties of the board. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] Preparation method of fragrance-releasing impregnated paper:

[0035] Fragrance microcapsules and melamine-formaldehyde glue were mixed at a mass ratio of 5:95. Decorative paper was impregnated with urea-formaldehyde resin glue and then placed in the mixture of fragrance microcapsules and melamine-formaldehyde glue for a second coating. The paper was then dried in an oven at 120°C for 3.5 minutes to obtain fragrance-releasing impregnated film paper.

[0036] The preparation method of the flavor microcapsules is as follows:

[0037] 1) Mix 10 kg of citron essential oil and 50 kg of lauryl phosphate, put them into a homogenizing emulsifier and ultrasonically emulsify at 40 W power for 30 min. Then use 30% triethanolamine to adjust the pH of the emulsion to neutral to obtain citron essential oil emulsion.

[0038] 2) Mix 50 kg of citron essential oil emulsion, 50 kg of 2% gelatin solution, and 50 kg of 2% gum arabic solution. Adjust the pH of the mixed solution to 4.1 and place it in a 40℃ sand bath and stir for 30 min. After removing it, let the solution cool and adjust its pH to 6. Then add 5 kg of transglutaminase and place it in an environment below 5℃ for low-temperature curing. Use a separatory funnel to separate the aqueous phase and emulsion phase of the citron essential oil microcapsule suspension to obtain fragrance microcapsules.

[0039] In all embodiments of the present invention, the fragrance-releasing impregnated film paper prepared according to the scheme of Example 1 is used.

[0040] Example 2

[0041] A method for preparing a slow-release, wear-resistant, fragrance-releasing ecological board:

[0042] (1) Coat both sides of the substrate with urea-formaldehyde resin adhesive, with a coating amount of 150g / m² on one side. 2 The adhesive substrate is obtained;

[0043] (2) Glue veneer is glued to both sides of the adhesive substrate, then cold-pressed at 0.1MPa for 2 hours, and then hot-pressed at 1.0MPa and 125℃ for 3 minutes;

[0044] (3) Take engineered wood veneer, coat one side of the engineered wood veneer with urea-formaldehyde resin glue, then cover it with fragrance-releasing impregnated film paper, and heat press at 125℃ and 1MPa for 3 minutes to set the shape.

[0045] (4) Take two pieces of engineered wood veneer that have been hot-pressed and shaped in step (3), coat the other side of the engineered wood veneer with urea-formaldehyde resin glue, and attach it to the other side of the eucalyptus veneer in step (2). After hot pressing at 125°C and 1MPa for 3 minutes, a slow-release wear-resistant fragrance-releasing ecological board is obtained.

[0046] Example 3

[0047] A method for preparing a slow-release, wear-resistant, fragrance-releasing ecological board:

[0048] (1) Coat both sides of the substrate with urea-formaldehyde resin adhesive, with a coating amount of 80g / m² on one side. 2 The adhesive substrate is obtained;

[0049] (2) Glue veneer is glued to both sides of the adhesive substrate, then cold-pressed at 3MPa for 0.1h, and then hot-pressed at 2.0MPa and 95℃ for 5min;

[0050] (3) Take engineered wood veneer, coat one side of the engineered wood veneer with urea-formaldehyde resin glue, then cover it with fragrance-releasing impregnated film paper, and heat press at 95℃ and 2MPa for 3 minutes to set the shape.

[0051] (4) Take two pieces of engineered wood veneer that have been hot-pressed and shaped in step (3), coat the other side of the engineered wood veneer with urea-formaldehyde resin glue, and attach it to the other side of the eucalyptus veneer in step (2). After hot pressing at 95°C and 2MPa for 3 minutes, a slow-release wear-resistant fragrance-releasing ecological board is obtained.

[0052] Example 4

[0053] A method for preparing a slow-release, wear-resistant, fragrance-releasing ecological board:

[0054] (1) Apply urea-formaldehyde resin adhesive to both sides of the substrate, with a single-sided coating amount of 120 g / m². 2 The adhesive substrate is obtained;

[0055] (2) Glue veneer is glued to both sides of the adhesive substrate, then cold-pressed at 1.5MPa for 1 hour, and then hot-pressed at 1.5MPa and 110℃ for 5 minutes.

[0056] (3) Take engineered wood veneer, coat one side of the engineered wood veneer with urea-formaldehyde resin glue, then cover it with fragrance-releasing impregnated film paper, and heat press at 95℃ and 1.5MPa for 3 minutes to set the shape.

[0057] (4) Take two pieces of engineered wood veneer that have been hot-pressed and shaped in step (3), coat the other side of the engineered wood veneer with urea-formaldehyde resin glue, and attach it to the other side of the eucalyptus veneer in step (2). After hot pressing at 95°C and 1.5MPa for 3 minutes, a slow-release wear-resistant fragrance-releasing ecological board is obtained.

[0058] Example 5

[0059] A method for preparing a slow-release, wear-resistant, fragrance-releasing ecological board:

[0060] (1) Coat both sides of the substrate with urea-formaldehyde resin adhesive, with a coating amount of 100g / m² on each side. 2 The adhesive substrate is obtained;

[0061] (2) Glue veneer is glued to both sides of the adhesive substrate, then cold-pressed at 0.3MPa for 2 hours, and then hot-pressed at 1.0MPa and 125℃ for 5 minutes;

[0062] (3) Take engineered wood veneer, coat one side of the engineered wood veneer with urea-formaldehyde resin glue, then cover it with fragrance-releasing impregnated film paper, and heat press at 95℃ and 1.1MPa for 3 minutes to set the shape.

[0063] (4) Take two pieces of engineered wood veneer that have been hot-pressed and shaped in step (3), coat the other side of the engineered wood veneer with urea-formaldehyde resin glue, and attach it to the other side of the eucalyptus veneer in step (2). After hot pressing at 95°C and 1.1MPa for 3 minutes, a slow-release wear-resistant fragrance-releasing ecological board is obtained.

[0064] The slow-release, wear-resistant, fragrance-releasing ecological board prepared in Example 5 was tested. Compared with the ecological board without microcapsules, its color difference (ΔE) increased by 2.5 units, gloss decreased by 8%, and wear resistance decreased by 5%. These are within the commercially acceptable range and do not affect the overall performance of the flooring.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preparing a slow-release, wear-resistant, fragrance-releasing ecological board, characterized in that, Includes the following steps: (1) Coat both sides of the substrate with urea-formaldehyde resin adhesive to obtain the adhesive substrate; (2) Glue veneer is glued to both sides of the adhesive substrate, and then cold pressing and hot pressing are performed in sequence; (3) Take engineered wood veneer, coat one side of the engineered wood veneer with urea-formaldehyde resin glue, then cover it with fragrance-releasing impregnated film paper, and heat press to shape; The method for preparing the fragrance-releasing impregnated adhesive film paper is as follows: fragrance microcapsules are mixed with melamine-formaldehyde glue, decorative paper is impregnated with urea-formaldehyde resin glue, and then placed in the mixture of fragrance microcapsules and melamine-formaldehyde glue for a second coating. Then, it is dried in an oven at 120°C for 3.5 minutes to obtain the fragrance-releasing impregnated adhesive film paper; the mass ratio of fragrance microcapsules to melamine-formaldehyde glue is 5:

95. The preparation method of the flavor microcapsules is as follows: 1) Mix 10 parts by weight of citron essential oil and 50 parts by weight of lauryl phosphate, place them in a homogenizing emulsifier and ultrasonically emulsify at 40W power for 30 minutes, then use triethanolamine to adjust the pH of the resulting emulsion to neutral to obtain citron essential oil emulsion. 2) Mix 50 parts by weight of citron essential oil emulsion, 50 parts by weight of gelatin solution, and 50 parts by weight of gum arabic solution. Adjust the pH of the mixed solution to 4.1 and place it in a sand bath at 40°C and stir for 30 minutes. After removing it, let the solution cool and adjust its pH to 6. Then add 5 parts by weight of transglutaminase and place it in an environment below 5°C for low-temperature curing. Use a separatory funnel to separate the aqueous phase and emulsion phase of the citron essential oil microcapsule suspension to obtain fragrance microcapsules. (4) Take two pieces of engineered wood veneer that have been hot-pressed and shaped in step (3), coat the other side of the engineered wood veneer with urea-formaldehyde resin glue, and attach it to the other side of the eucalyptus veneer in step (2). After hot pressing, a slow-release wear-resistant fragrance-releasing ecological board is obtained.

2. The method for preparing a slow-release, wear-resistant, fragrance-releasing ecological board according to claim 1, characterized in that, The substrate mentioned in step (1) is any one of solid wood board, artificial board, wood composite board, and wood fiberboard; The amount of urea-formaldehyde resin adhesive applied to one side of the substrate is 80-150 g / m². 2 .

3. The method for preparing a slow-release, wear-resistant, fragrance-releasing ecological board according to claim 1, characterized in that, In step (2), the cold pressing pressure is 0.1-3 MPa and the cold pressing time is 0.1-2 h; the hot pressing pressure is 1-2 MPa, the hot pressing temperature is 95-125 ℃, and the hot pressing time is 3-5 min.

4. The method for preparing a slow-release, wear-resistant, fragrance-releasing ecological board according to claim 1, characterized in that, The hot pressing temperature in step (3) is 95-125℃, the hot pressing pressure is 1-2MPa, and the hot pressing time is 3min.

5. The method for preparing a slow-release, wear-resistant, fragrance-releasing ecological board according to claim 1, characterized in that, The hot pressing temperature in step (4) is 95-125℃, the hot pressing pressure is 1-2MPa, and the hot pressing time is 3min.

6. The method for preparing a slow-release, wear-resistant, fragrance-releasing ecological board according to claim 1, characterized in that, The amount of adhesive applied to the engineered wood veneer in step (4) is 150-220 g / m². 2 .