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

Abstract

The invention discloses a preparation method of a slow-release wear-resistant fragrance-releasing ecological board, which belongs to the field of wood processing and manufacturing, and comprises the following steps: coating urea-formaldehyde resin adhesive on both sides of a base material; eucalyptus veneers are attached to the two faces of the sizing base material respectively, and cold pressing and hot pressing are conducted in sequence; one side of the technical veneer is coated with urea-formaldehyde resin glue, then fragrance-releasing type impregnated bond paper covers the urea-formaldehyde resin glue, and hot-pressing shaping is carried out; and taking two pieces of technical wood veneers subjected to hot-pressing shaping, coating the other surfaces of the technical wood veneers with urea-formaldehyde resin glue, attaching the technical wood veneers to the other surfaces of the eucalyptus veneers, and performing hot-pressing to obtain the slow-release wear-resistant fragrance-releasing ecological board. The method provided by the invention can effectively delay the fragrance release time of the fragrance release type ecological board and can reduce the physical and mechanical properties of the board due to the addition of the microcapsules.

Description

Technical Field

[0001] The invention relates to the field of wood processing and manufacturing, and in particular to a method for preparing a slow-release wear-resistant fragrance-releasing ecological board. Background Art

[0002] In recent years, with the improvement of living standards and health awareness, people have higher and higher expectations for the added value of household products. Affected by the manufacturing process, the artificial board materials widely used in household products often have bad odors, and long-term storage in indoor environments is not conducive to human physical and mental health. The addition of aromatic substances has a significant odor improvement effect on artificial board materials, and the preparation of artificial boards for household use requires high temperature and high pressure process conditions. Before adding aromatic substances to artificial boards, the method of microencapsulation of fragrances is often used. Through physical or chemical methods, polymer materials are polymerized into films to wrap essential oil droplets to reduce the heat loss of aromatic substances caused by high temperature. Although aromatic microcapsule technology has been applied to ecological boards, the sustained release effect of existing fragrance-releasing boards is poor due to the influence of microcapsule particle size, wall material type, etc., and the surface wear resistance, surface scratch resistance, and surface bonding strength are all reduced to a certain extent.

[0003] Therefore, providing a method for preparing a slow-release wear-resistant fragrance-releasing ecological board that can effectively delay the fragrance release time of the slow-release fragrance-releasing ecological board and reduce the impact of the addition of microcapsules on the physical and mechanical properties of the board is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] In view of this, the present invention provides a method for preparing a slow-release wear-resistant fragrance-releasing ecological board.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A method for preparing a slow-release wear-resistant fragrance-releasing ecological board comprises the following steps:

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

[0008] (2) laminating eucalyptus veneers on both sides of the adhesive substrate, and then cold pressing and hot pressing are performed in sequence;

[0009] (3) taking the technical veneer, coating one side of the technical veneer with urea-formaldehyde resin glue, and then covering it with fragrance-releasing impregnated adhesive film paper, and hot pressing to shape it;

[0010] (4) Take two pieces of the technological veneer formed by hot pressing in step (3), apply urea-formaldehyde resin glue on the other side of the technological veneer, and stick it to the other side of the eucalyptus veneer in step (2), and after hot pressing, obtain a slow-release wear-resistant and fragrance-releasing ecological board.

[0011] Furthermore, in the solution of the present invention, urea-formaldehyde resin glue can be replaced by any other glue having the same function and effect.

[0012] Furthermore, the substrate in step (1) is any one of a solid wood board, a man-made board, a wood composite material board, and a wood fiberboard;

[0013] The substrate can also be selected from acacia wood boards, larch boards, eucalyptus boards, fast-growing poplar boards, large poplar boards, oriented structural strand boards, poplar veneers, fir composite floors, and the like.

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

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

[0016] Furthermore, 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° C., and the hot pressing time is 3-5 min.

[0017] Preferably, the cold pressing pressure is 0.3 MPa, and the cold pressing time is 2 hours; the hot pressing pressure is 1.0 MPa, the hot pressing temperature is 125°C, and the hot pressing time is 5 minutes.

[0018] Furthermore, the preparation method of the fragrance-releasing impregnated adhesive film paper in step (3) is: mixing the fragrance microcapsules with melamine-formaldehyde glue, impregnating the decorative paper with urea-formaldehyde resin glue, and then placing it in the mixed solution of the fragrance microcapsules and melamine-formaldehyde glue for secondary gluing, and then drying it in an oven at 120° C. for 3.5 minutes to obtain the fragrance-releasing impregnated adhesive film paper.

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

[0020] Furthermore, the preparation method of the essence microcapsule is:

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

[0022] 2) 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 are mixed, the pH of the mixed solution is adjusted to 4.1 and then placed in a 40° C. sand bath and stirred for 30 minutes, the solution is cooled after being taken out, the pH thereof is adjusted to 6, and then 5 parts by weight of transglutaminase is added and placed in an environment below 5° C. for low-temperature solidification, and a separating funnel is used to separate the aqueous phase and the emulsion phase of the citron essential oil microcapsule suspension to obtain flavor microcapsules.

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

[0024] The above further embodiments have the following beneficial effects: The above embodiments of the present invention highlight the potential of microcapsule technology in adding multifunctional properties such as fragrance to traditional flooring materials, making them more attractive for residential and commercial applications. The preparation method of the microcapsules of the present invention can be integrated into existing production processes with less disruption to the production process.

[0025] The ability of the microcapsules of the present invention to maintain their core-shell structure during the manufacturing process ensures that the fragrance remains intact and is gradually released over time. The lavender microcapsules showed an 85% fragrance release rate within the first 48 hours, after which the fragrance release rate slowed down and continued to release. Chemical composition analysis by FTIR also confirmed the stability of the lavender fragrance within the microcapsules, and SEM images showed that the microcapsules were evenly dispersed throughout the coating, i.e., they were not damaged during the application process, and the microcapsules could withstand the physical and thermal stresses of the floor production process.

[0026] Furthermore, the urea-formaldehyde resin adhesive applied in step (3) and step (4) of the present invention can be replaced by polyamide-formaldehyde resin, polyurethane-based adhesive or soy-based adhesive.

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

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

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

[0030] Furthermore, the coating amount of the glue on the technical veneer in step (4) is 150-220g / m 2 .

[0031] The beneficial effects of the present invention are as follows: the improvement of the sustained-release effect of the present invention is mainly due to the double-wall microcapsule structure formed by lauryl phosphate and gelatin-arabic gum. Lauryl phosphate has good surface activity and heat resistance. After being mixed and emulsified with citron essential oil, the essential oil can be evenly dispersed and a single-wall 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-wall structure. After cross-linking and curing with transglutaminase, the thermal stability of the microcapsules can be further improved. The prepared citron essential oil microcapsules are applied to the ecological board to obtain the fragrance-releasing ecological board, which can effectively delay the fragrance release time of the fragrance-releasing ecological board and the residual amount of citron essential oil within 90 days, and can reduce the effect of the addition of microcapsules on the physical and mechanical properties of the board. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1

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

[0035] The fragrance microcapsules and melamine-formaldehyde glue are mixed in a mass ratio of 5:95. The decorative paper is impregnated with urea-formaldehyde resin glue and then put into the mixed solution of the fragrance microcapsules and melamine-formaldehyde glue for secondary gluing. The paper is then dried in an oven at 120° C. for 3.5 minutes to obtain a fragrance-releasing impregnated glue film paper.

[0036] Wherein; the preparation method of essence microcapsule is:

[0037] 1) 10 kg of citron essential oil and 50 kg of lauryl phosphate were mixed, placed in a homogenizer and ultrasonically emulsified at 40 W for 30 min, and then the pH of the obtained emulsion was adjusted to neutral using triethanolamine with a mass concentration of 30%, to obtain a citron essential oil emulsion;

[0038] 2) 50 kg of citron essential oil emulsion, 50 kg of 2% gelatin solution, and 50 kg of 2% gum arabic solution are mixed, the pH of the mixed solution is adjusted to 4.1, and then the mixed solution is placed in a 40° C. sand bath and stirred for 30 min. After taking out, the solution is cooled, and its pH is adjusted to 6. Then, 5 kg of transglutaminase is added and placed in an environment below 5° C. for low-temperature solidification. A separating funnel is used to separate the aqueous phase and the emulsion phase of the citron essential oil microcapsule suspension to obtain flavor microcapsules.

[0039] The embodiments of the present invention all adopt the fragrance-releasing impregnated film paper prepared by the scheme of Embodiment 1.

[0040] Example 2

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

[0042] (1) Urea-formaldehyde resin glue is applied on both sides of the substrate, and the coating amount of urea-formaldehyde resin glue on one side is 150g / m 2 , obtaining a sizing substrate;

[0043] (2) Gluing eucalyptus veneer to both sides of the glued substrate, followed by cold pressing at 0.1 MPa for 2 h, and then hot pressing at 1.0 MPa and 125°C for 3 min;

[0044] (3) taking the technical veneer, coating one side of the technical veneer with urea-formaldehyde resin glue, and then covering it with fragrance-releasing impregnated adhesive film paper, and hot pressing at 125° C. and 1 MPa for 3 min to fix the shape;

[0045] (4) Take two pieces of technological veneer after hot pressing and shaping in step (3), apply urea-formaldehyde resin glue on the other side of the technological veneer, and stick it to the other side of the eucalyptus veneer in step (2), and hot press at 125° C. and 1 MPa for 3 minutes to obtain a slow-release wear-resistant and fragrance-releasing ecological board.

[0046] Example 3

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

[0048] (1) Urea-formaldehyde resin glue is applied on both sides of the substrate, and the coating amount of urea-formaldehyde resin glue on one side is 80g / m 2 , obtaining a sizing substrate;

[0049] (2) Gluing eucalyptus veneer to both sides of the glued substrate, followed by cold pressing at 3 MPa for 0.1 h, and then hot pressing at 2.0 MPa and 95°C for 5 min;

[0050] (3) Take the technical veneer, apply urea-formaldehyde resin glue on one side of the technical veneer, and then cover it with fragrance-releasing impregnated adhesive film paper, and heat press at 95° C. and 2 MPa for 3 minutes to fix it;

[0051] (4) Take two pieces of technological veneer after hot pressing and shaping in step (3), apply urea-formaldehyde resin glue on the other side of the technological veneer, and stick it to the other side of the eucalyptus veneer in step (2), and hot press at 95° C. and 2 MPa for 3 minutes to obtain a slow-release wear-resistant and fragrance-releasing ecological board.

[0052] Example 4

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

[0054] (1) Urea-formaldehyde resin glue is applied on both sides of the substrate, and the coating amount of urea-formaldehyde resin glue on one side is 120g / m 2 , obtaining a sizing substrate;

[0055] (2) Gluing eucalyptus veneer to both sides of the glued substrate, followed by cold pressing at 1.5 MPa for 1 h, and then hot pressing at 1.5 MPa and 110°C for 5 min;

[0056] (3) taking the technical veneer, coating one side of the technical veneer with urea-formaldehyde resin glue, and then covering it with fragrance-releasing impregnated adhesive film paper, and hot pressing at 95° C. and 1.5 MPa for 3 min to set the shape;

[0057] (4) Take two pieces of technological veneer after hot pressing and shaping in step (3), apply urea-formaldehyde resin glue on the other side of the technological veneer, and stick it to the other side of the eucalyptus veneer in step (2), and hot press at 95° C. and 1.5 MPa for 3 minutes to obtain a slow-release wear-resistant and fragrance-releasing ecological board.

[0058] Example 5

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

[0060] (1) Urea-formaldehyde resin glue is applied on both sides of the substrate, and the coating amount of urea-formaldehyde resin glue on one side is 100g / m 2 , obtaining a sizing substrate;

[0061] (2) eucalyptus veneer is laminated on both sides of the adhesive substrate, and then cold pressed at 0.3 MPa for 2 h, and then hot pressed at 1.0 MPa and 125°C for 5 min;

[0062] (3) Take the technical veneer, apply urea-formaldehyde resin glue on one side of the technical veneer, and then cover it with fragrance-releasing impregnated film paper, and heat press at 95° C. and 1.1 MPa for 3 minutes to fix the shape;

[0063] (4) Take two pieces of technological veneer that have been hot-pressed and shaped in step (3), apply urea-formaldehyde resin glue on the other side of the technological veneer, and stick it to the other side of the eucalyptus veneer in step (2), and hot-press at 95° C. and 1.1 MPa for 3 minutes to obtain a slow-release, wear-resistant, and fragrance-releasing ecological board.

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

[0065] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary 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: The following steps are involved: (1) coating urea-formaldehyde resin glue on both sides of the substrate to obtain a glue-coated substrate; (2) laminating eucalyptus veneers on both sides of the adhesive substrate, and then cold pressing and hot pressing are performed in sequence; (3) taking the technical veneer, coating one side of the technical veneer with urea-formaldehyde resin glue, and then covering it with fragrance-releasing impregnated adhesive film paper, and hot pressing to shape it; (4) Take two pieces of the technological veneer formed by hot pressing in step (3), apply urea-formaldehyde resin glue on the other side of the technological veneer, and stick it to the other side of the eucalyptus veneer in step (2), and after hot pressing, obtain a slow-release wear-resistant and fragrance-releasing ecological board.

2. The method for preparing a sustained-release wear-resistant fragrance-releasing ecological board according to claim 1, characterized in that: The substrate in step (1) is any one of a solid wood board, a man-made board, a wood composite material board, and a wood fiberboard; The coating amount of urea-formaldehyde resin glue on one side of the substrate is 80-150g / m 2 .

3. The method for preparing a sustained-release wear-resistant fragrance-releasing ecological board according to claim 1, characterized in that: In step (2), the cold pressing pressure 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°C, and the hot pressing time is 3-5min.

4. The method for preparing a sustained-release wear-resistant fragrance-releasing ecological board according to claim 1, characterized in that: The preparation method of the fragrance-releasing impregnated adhesive film paper described in step (3) is as follows: mixing the fragrance microcapsules with melamine-formaldehyde glue, impregnating the decorative paper with urea-formaldehyde resin glue, and then placing it in the mixed solution of the fragrance microcapsules and melamine-formaldehyde glue for secondary gluing, and then drying it in an oven at 120° C. for 3.5 minutes to obtain the fragrance-releasing impregnated adhesive film paper.

5. The method for preparing a sustained-release wear-resistant fragrance-releasing ecological board according to claim 4, characterized in that: The mass ratio of the fragrance microcapsules to the melamine-formaldehyde glue is 5:

95.

6. A method for preparing a sustained-release wear-resistant fragrance-releasing ecological board according to claim 4 or 5, characterized in that: The preparation method of the essence microcapsule is as follows: 1) 10 parts by weight of citron essential oil and 50 parts by weight of lauryl phosphate are mixed, put into a homogenizing emulsifier and ultrasonically emulsified at a power of 40 W for 30 min, and then the pH of the obtained emulsion is adjusted to neutral using triethanolamine to obtain a citron essential oil emulsion; 2) 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 are mixed, the pH of the mixed solution is adjusted to 4.1 and then placed in a 40° C. sand bath and stirred for 30 minutes, the solution is cooled after being taken out, the pH thereof is adjusted to 6, and then 5 parts by weight of transglutaminase is added and placed in an environment below 5° C. for low-temperature solidification, and a separating funnel is used to separate the aqueous phase and the emulsion phase of the citron essential oil microcapsule suspension to obtain flavor microcapsules.

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

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

9. The method for preparing a sustained-release wear-resistant fragrance-releasing ecological board according to claim 1, characterized in that: The coating amount of the glue on the technical veneer in step (4) is 150-220g / m 2 .