A type of engineered wood panel with ultra-long room temperature phosphorescence characteristics

Abstract

This invention relates to the field of functional engineered wood products, specifically to an engineered wood product with ultra-long room-temperature phosphorescence characteristics. The engineered wood product includes bonded units and an adhesive layer located between adjacent bonded units. The adhesive layer is formed by an adhesive that, upon curing, can generate room-temperature phosphorescence. Under external light excitation, the adhesive layer can generate ultra-long room-temperature phosphorescence emission, and the emission signal includes at least one of the following: emission color, emission intensity, emission spectrum, delayed emission image, and / or phosphorescence lifetime. The bonded units are selected from at least one of the following: decorative paper, thin wood veneer, engineered wood veneer, wood veneer, wood / bamboo strips, wood / bamboo shavings, wood / bamboo fiber, straw, and biomass fragments. By adjusting the adhesive system, interface structure, and hot-pressing process parameters, the resulting engineered wood product can exhibit different room-temperature phosphorescence characteristics. This invention endows the board with stable room-temperature phosphorescence function without changing the basic manufacturing process of existing engineered wood products, possessing good process compatibility and application prospects. The room-temperature phosphorescence signal can construct material-level optical coding information, realizing the identification and anti-counterfeiting traceability of the engineered wood product.

Description

Technical Field

[0001] This invention relates to the field of functional wood-based panels, specifically to a wood-based panel with ultra-long room temperature phosphorescence characteristics. Background Technology

[0002] Wood-based panels are among the most widely used engineered wood products, playing a vital role in construction, furniture, packaging, and decoration. Adhesives, as key components for interfacial bonding and performance regulation in engineered wood products, not only affect the mechanical properties and durability of the panels but also directly impact processing quality and safety. With the continuous extension of the wood materials industry chain and the accelerating trend of product differentiation, the demand for functionalization in high-quality engineered wood products—including batch identification, traceability, and anti-counterfeiting verification—is increasing.

[0003] Existing wood-based panels primarily function as structural components, typically used only for load-bearing, support, and decoration, lacking observable optical functional characteristics. In practical applications, the panels themselves rarely exhibit specific optical response behaviors.

[0004] With the development of functional materials, endowing traditional materials with new optical properties has become an important research direction. The multi-dimensional information characteristics of phosphorescence afterglow make it have great application potential in this field compared with instantaneous fluorescence. However, it is difficult to introduce stable phosphorescence characteristics into the structural system of existing wood-based panels, especially to achieve continuous and observable room temperature phosphorescence while maintaining compatibility with the original mechanical properties and processing technology.

[0005] Therefore, it is necessary to provide a type of engineered wood panel that can produce panels with stable and identifiable room-temperature phosphorescence properties without changing the existing engineered wood panel manufacturing process. Summary of the Invention

[0006] The purpose of this invention is to provide a type of engineered wood panel with an ultra-long room temperature phosphorescence characteristic, in order to solve the problems of existing engineered wood panel anti-counterfeiting technologies that rely on externally attached markings, are easily worn and tampered with, and cannot achieve material-level identification.

[0007] To achieve the above objectives, the present invention provides a wood-based panel with ultra-long room temperature phosphorescence characteristics, comprising bonded units and an adhesive layer disposed between the bonded units, wherein the adhesive layer is formed of an adhesive that can produce ultra-long room temperature phosphorescence after curing.

[0008] In this invention, different adhesives, engineered wood panel structures, hot-pressing parameters, or production batches can correspond to different room-temperature phosphorescence signal characteristics. These room-temperature phosphorescence signal characteristics include emission color, emission intensity, emission spectral distribution, delayed emission image, and / or phosphorescence lifetime, thereby constituting distinguishable optical coding information.

[0009] The objective of this invention and the technical problem it solves are achieved through the following technical solutions: A type of engineered wood panel characterized by ultra-long room temperature phosphorescence, characterized in that it comprises a bonded unit and an adhesive layer between the bonded unit, the adhesive layer being formed by an adhesive that can generate ultra-long room temperature phosphorescence after curing; the adhesive layer, after photoexcitation, can generate at least one room temperature phosphorescence signal including emission color, emission intensity, emission spectrum, delayed emission image, and phosphorescence lifetime.

[0010] The glued unit is selected from at least one of the following: veneer paper, thin wood veneer, engineered wood veneer, wood veneer, wood / bamboo strips, wood / bamboo shavings, wood / bamboo fiber, straw, and biomass scraps; the resulting engineered wood product is laminated veneer lumber, plywood, fine particle veneer plywood, particleboard, oriented strand board, MDF, finger-jointed board, blockboard, and the veneer products of the above engineered wood products.

[0011] The adhesive is selected from at least one of the following systems: modified urea-formaldehyde resin, modified phenolic resin, modified isocyanate, modified epoxy resin, modified polyurethane, modified polyvinyl alcohol adhesive, and lignin adhesive, which can produce ultra-long room temperature phosphorescence under photoexcitation after curing.

[0012] The adhesive layer is located at the interface of adjacent bonded units and forms a continuous or discontinuous optical recognition area; the adhesive layer produces room temperature phosphorescence emission with an average lifetime of 100-2000 ms and a visible afterglow time of 1-60 s under transient fluorescence spectroscopy test conditions; the phosphorescence color is red, yellow, yellow-green, green, blue, dark blue and blue-green that can be recognized by the naked eye. Preferably, the phosphorescent color is one or more of the following colors that are visible to the naked eye: red, yellow, yellow-green, and green. Compared with the prior art, the present invention has at least the following beneficial effects: (1) The optical recognition signal is embedded in the adhesive layer of the artificial board, so that the adhesive layer can simultaneously undertake the functions of interlayer bonding and identity information carrying, realizing the integration of artificial board performance and recognition function; (2) The optical information is located inside the material. Compared with external identification methods such as external labels, QR codes, surface inkjet printing or additional chips, it is less prone to wear, peeling, covering, replacement or human tampering. It accompanies the entire service life of the artificial board and has better stability and reliability; (3) The artificial board can construct multi-dimensional optical coding information through one or more parameters such as emission color, emission spectrum, phosphorescence lifetime and time-gated delayed emission image, which can identify rich dimensions and high distinguishability; (4) The functional adhesive system and board construction method adopted in this invention have good compatibility with existing mainstream production processes. There is no need to add an independent label layer or complex additional process, which is convenient for industrial implementation; (5) The ultra-long room temperature phosphorescence characteristics of the artificial board of this invention can support anti-counterfeiting identification, source traceability, production batch management, warehouse identification, circulation supervision and intelligent manufacturing information marking, etc., and has good application prospects. Detailed Implementation

[0013] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this invention. Non-substantial improvements and adjustments made by those skilled in the art based on the teachings of this invention should fall within the scope of protection of this invention. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific technical features, structures, or characteristics in one or more embodiments can be combined in an appropriate manner. The invention will be further described below with reference to specific embodiments, but this should not be construed as a limitation on the scope of protection of this invention. Non-substantial improvements and adjustments made by those skilled in the art based on the above-described invention should still fall within the scope of protection of this invention.

[0014] Unless otherwise specified, the raw materials, reagents, and instruments used in the following examples are all conventional products available in the art; the methods employed are all conventional methods in the art. Unless otherwise defined, the technical or scientific terms used herein should have the meanings commonly understood by one of ordinary skill in the art to which this invention pertains.

[0015] The engineered wood panel of this invention comprises bonded units and an adhesive layer located between adjacent bonded units. The adhesive layer is formed by an adhesive that emits room-temperature phosphorescence upon curing. The bonded units may be decorative paper, thin wood veneer, engineered wood veneer, wood veneer, wood / bamboo strips, wood / bamboo shavings, wood / bamboo fiber, straw, biomass fragments, etc. The adhesive may be a modified urea-formaldehyde resin, modified phenolic resin, modified isocyanate, modified epoxy resin, modified polyurethane, lignin adhesive, etc., that emits phosphorescence upon curing.

[0016] In the above embodiments, by screening and controlling the adhesive system, interface structure and hot pressing process parameters, the room temperature phosphorescence signal of the artificial board can be controlled in terms of emission color, emission intensity and phosphorescence lifetime.

[0017] Example 1 Poplar veneer was selected as the bonding unit, and a natural phenolic polymer modified urea-formaldehyde resin adhesive with room temperature phosphorescence properties was used as the bonding material. The veneer was assembled into a three-layer structure and then hot-pressed and cured to obtain plywood.

[0018] The adhesive layer of the three-layer plywood was observed, and the test results showed that the obtained plywood exhibited green delayed emission under 365 nm ultraviolet light excitation, with an average phosphorescence lifetime of about 470 ms, an afterglow duration of about 20 s, and a stable emission signal.

[0019] The phosphorescent signal is mainly distributed in the adhesive layer area between adjacent veneers, and is continuously distributed, indicating that a stable room temperature phosphorescent emission interface is formed inside the plywood.

[0020] Example 2: Eucalyptus wood shavings were selected as the bonding unit. A natural phenolic polymer modified phenolic resin adhesive with room temperature phosphorescence properties was applied to the surface of the shavings and then shaped and cured to obtain eucalyptus wood shaving board.

[0021] Observations were made on the surface and sides of the particleboard. The test results showed that the obtained particleboard emitted orange-yellow room-temperature phosphorescence under 365 nm ultraviolet light excitation, with an average phosphorescence lifetime of about 300 ms. When the moisture content of the board was 7%, the afterglow duration was about 8 s, and when the moisture content was 12%, the afterglow duration was about 3 s. The afterglow time was related to the difference in moisture content caused by the hot pressing process.

[0022] The phosphorescent signal is mainly distributed in the adhesive layer area between adjacent wood chips, and is distributed continuously or intermittently, indicating that a stable room temperature phosphorescent emission interface is formed inside the particleboard.

[0023] Example 3 Eucalyptus fiber was selected as the bonding unit, and a polycyclic phenol-modified urea-formaldehyde resin adhesive with room temperature phosphorescence properties was used for gluing and lamination curing to obtain medium-density fiberboard.

[0024] Test results show that when the sizing amount is 8%, the resulting particleboard laminate exhibits red-orange room-temperature phosphorescence emission under 365 nm ultraviolet light excitation, with an average phosphorescence lifetime of approximately 120 ms and an afterglow duration of approximately 5 s, and the luminescence signal is stable. When the sizing amount is 10%, the afterglow duration is approximately 3 s. The afterglow time is correlated with the sizing amount.

[0025] The phosphorescent signal is mainly distributed at the interface between adjacent fibers, and the whole-body luminescence phenomenon is observed by the naked eye, indicating that the medium density fiberboard has obvious room temperature phosphorescence response characteristics.

Claims

1. A type of engineered wood panel with ultra-long room temperature phosphorescence characteristics, characterized in that, The adhesive layer includes a bonded unit and an adhesive layer between the bonded unit, the adhesive layer being formed of an adhesive that can produce ultra-long room temperature phosphorescence after curing; the adhesive layer, upon photoexcitation, can produce at least one room temperature phosphorescence signal including emission color, emission intensity, emission spectrum, delayed emission image, and phosphorescence lifetime.

2. The artificial board with ultra-long room temperature phosphorescence characteristics according to claim 1, characterized in that, The glued unit is selected from at least one of the following: veneer paper, thin wood veneer, engineered wood veneer, wood veneer, wood / bamboo strips, wood / bamboo shavings, wood / bamboo fiber, straw, and biomass scraps; the resulting engineered wood product is laminated veneer lumber, plywood, fine particle veneer plywood, particleboard, oriented strand board, MDF, finger-jointed board, blockboard, and the veneer products of the above engineered wood products.

3. The artificial board with ultra-long room temperature phosphorescence characteristics according to claim 1, characterized in that, The adhesive is selected from at least one of the following systems: modified urea-formaldehyde resin, modified phenolic resin, modified isocyanate, modified epoxy resin, modified polyurethane, modified polyvinyl alcohol adhesive, and lignin adhesive, which can produce ultra-long room temperature phosphorescence under photoexcitation after curing.

4. The artificial board with ultra-long room temperature phosphorescence characteristics according to claim 1, characterized in that, The adhesive layer is located at the interface of adjacent bonded units and forms a continuous or discontinuous optical recognition area; the adhesive layer produces room temperature phosphorescence emission with an average lifetime of 100-2000 ms and a visible afterglow time of 1-60 s under transient fluorescence spectrometry testing conditions; the phosphorescence color is one or more of the following colors that are visible to the naked eye: red, yellow, yellow-green, green, blue, dark blue, and blue-green.

5. The artificial board with ultra-long room temperature phosphorescence characteristics according to claim 1, characterized in that, Different adhesives, particleboard structures, hot-pressing parameters, or production batches correspond to different room temperature phosphorescence signal characteristics.