CN116038847A - High-water-resistance recombined wood and preparation method thereof - Google Patents

High-water-resistance recombined wood and preparation method thereof Download PDF

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Publication number
CN116038847A
CN116038847A CN202211538181.4A CN202211538181A CN116038847A CN 116038847 A CN116038847 A CN 116038847A CN 202211538181 A CN202211538181 A CN 202211538181A CN 116038847 A CN116038847 A CN 116038847A
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CN
China
Prior art keywords
wood
veneer
resistance
reconstituted
recombined
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Pending
Application number
CN202211538181.4A
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Chinese (zh)
Inventor
于文吉
张方达
王守君
林秋琴
王小霞
吴婕妤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shandong Shengchang New Material Co ltd
Research Institute of Wood Industry of Chinese Academy of Forestry
Original Assignee
Shandong Shengchang New Material Co ltd
Research Institute of Wood Industry of Chinese Academy of Forestry
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Application filed by Shandong Shengchang New Material Co ltd, Research Institute of Wood Industry of Chinese Academy of Forestry filed Critical Shandong Shengchang New Material Co ltd
Priority to CN202211538181.4A priority Critical patent/CN116038847A/en
Publication of CN116038847A publication Critical patent/CN116038847A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
    • B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
    • 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
    • B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • 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
    • B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D3/00—Veneer presses; Press plates; Plywood presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G11/00—Applying adhesives or glue to surfaces of wood to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L5/00—Manufacture of veneer ; Preparatory processing therefor
    • B27L5/02—Cutting strips from a rotating trunk or piece; Veneer lathes

Abstract

The invention provides a high-water-resistance reconstituted wood and a preparation method thereof. According to the invention, the traditional gum dipping or roller coating is improved into double-sided gum spraying, the gum is mainly reserved on the surface of the veneer along with the rapid loss of moisture after gum spraying, the adhesive permeates from the surface of the veneer to the inside of the veneer along the cell wall during hot pressing, the cured adhesive is mainly distributed on or in the cell wall, and the residual gum in the cell cavity of the veneer is less, so that the water resistance and mechanical property of the reconstituted wood are effectively improved. The glue-applying amount is 13-20% of recombined wood, after 28 hours of circulating water boiling treatment, the thickness expansion rate is not more than 2.6%, and the width expansion rate is not more than 0.7%.

Description

High-water-resistance recombined wood and preparation method thereof
Technical Field
The invention relates to the technical field of reconstituted wood, in particular to high-water-resistance reconstituted wood and a preparation method thereof.
Background
The recombined wood is made by spin-cutting wood into single boards without disturbing the arrangement direction of wood fibers and retaining the basic characteristics of wood, directly gluing thin single boards, fluffing thick single boards into wood bundles, gluing the wood bundles, and then performing hot-press gluing on glued recombined wood units. Can replace solid wood hard wood, and has better performance than the solid wood hard wood. The method for preparing the recombined wood by using the fast-growing wood through the wood recombination technology can overcome the defects of small diameter grade, loose material, poor dimensional stability, low mechanical strength, easy decay under the damp and hot condition and the like of the fast-growing wood, and eliminate the influence of growth defects such as knots, cracks, insect pests and the like in the wood on the structural material. The wood recombination technology can greatly improve the added value and the application range of the fast-growing wood.
At present, laminated veneer lumber prepared by wood veneers is mainly glued or roll-coated in a gluing mode. For example, chinese patent application publication No. CN109719810a discloses a method for preparing an anti-corrosive recombined wood, wherein the sizing mode is gum dipping, the sizing amount is difficult to control and the drying energy consumption is high, more importantly, the water absorption rate is more than 30% under the condition that the gum dipping amount is 13%, the water absorption thickness expansion rate is 21-33%, the water absorption width expansion rate is 4.9-5.38%, and the water resistance is poor.
Disclosure of Invention
The invention provides a high-water-resistance reconstituted wood and a preparation method thereof, which are used for solving the defect of poor water resistance of the reconstituted wood in the prior art, realizing that fast-growing wood is made into the reconstituted wood with good water resistance, improving the added value and expanding the application range.
The invention provides a preparation method of high-water-resistance reconstituted wood, which comprises the step of spraying double-sided adhesive on a wooden thin veneer.
The invention researches that compared with the glue dipping mode, the glue solution remained in the cell cavity of the recombined wood prepared by adopting the veneer glue spraying mode is less, and under the condition of the same glue application amount, the glue is more distributed on the cell wall or in the cell wall after being solidified, so that the water resistance and the mechanical property of the board are better.
According to the preparation method of the high-water-resistance reconstituted wood provided by the invention, the double-sided adhesive spraying is carried out in an airless high-pressure spraying mode.
The invention adopts a airless high-pressure spraying mode, has high sizing efficiency, little glue solution loss and little environmental pollution in the sizing process, and has high drying efficiency and low energy consumption of the wood thin veneer.
According to the preparation method of the high-water-resistance recombined wood, the colloid is the phenolic resin adhesive with the solid content of 20-30%, and the sizing amount is controlled to be 13-20% of the mass of the wood veneer.
According to the preparation method of the recombined wood with high water resistance, after glue spraying, the thin wood veneer is horizontally placed until the glue solution is absorbed, and then the wood veneer is dried until the water content is 10-12%.
According to the preparation method of the high-water-resistance recombined wood, provided by the invention, the preparation method further comprises the steps of assembling and hot-pressing and gluing the wood thin veneer after glue spraying and drying.
As will be appreciated by those skilled in the art, the density and sizing of the reconstituted wood can be selected according to the use of the reconstituted wood, and generally the density is greater than or equal to 0.9g/cm 3 . Further, taking the wood thin veneer with better quality after glue spraying and drying as an upper surface and a lower surface; adopts a smooth grain assembly mode.
According to the preparation method of the high-water-resistance recombined wood provided by the invention, the hot-press gluing conditions comprise: the hot pressing temperature is 150+/-5 ℃, the hot pressing pressure is 4-6MPa, and the hot pressing time is 1+/-0.1 min/mm.
According to the preparation method of the high-water-resistance recombined wood, the thickness of the wood thin veneer is 0.6-1.3mm.
According to the preparation method of the high-water-resistance recombined wood provided by the invention, the preparation of the wood thin veneer comprises the following steps: cutting log into wood segments, softening to improve wood plasticity, removing bark, determining rotary cutting center of wood segments, rotary cutting into 0.6-1.3mm thick wood thin veneer, and drying.
The invention also provides the high-water-resistance recombined wood prepared by the preparation method.
According to the high-water-resistance reconstituted wood provided by the invention, after a 28-hour soaking experiment, the thickness expansion rate is not more than 2.3%, and the width expansion rate is not more than 0.4%.
The invention provides a high-water-resistance reconstituted wood and a preparation method thereof, wherein the traditional gum dipping or roller coating is improved into double-sided gum spraying, so that the residual gum solution in the cell cavities of a wooden thin veneer is less, and the gum solution can permeate into the cell walls in the board from the surface of the board during hot pressing, thereby effectively improving the water resistance of the reconstituted wood. After 28 hours of circulating water boiling treatment, the recombined wood with the sizing amount of 13-20 percent has the thickness expansion rate of not more than 2.6 percent and the width expansion rate of not more than 0.7 percent.
Drawings
Fig. 1 is a graph of the end surface morphology (x 100) of a reconstituted wood prepared using veneer impregnation (left) in comparative example 1 and veneer spray (right) in example 1.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment provides a preparation method of recombined wood, which comprises the following steps:
step one, preparing a wood thin veneer: firstly cutting log into wood segments, then softening to improve the plasticity of the wood, then peeling bark, determining the rotary cutting rotation center of the wood segments, rotary cutting the wood segments into wood thin veneers with the thickness of 1mm, and drying for later use;
step two, spraying adhesive on the two sides of the wood thin veneer: and diluting the phenolic resin until the solid content is 25%, and performing double-sided adhesive spraying in an airless high-pressure spraying mode, wherein the sizing amount is controlled to be 16%. After glue spraying, the wood thin veneer is horizontally placed so that glue solution permeates into the veneer, and after the glue solution is fully absorbed, the water content of the glued veneer is dried to 11%;
step three, veneer assembly and hot pressing gluing: and placing the veneers with good quality on the upper and lower surfaces of the slab by adopting a smooth grain assembly mode. Hot pressing process parameters: and (3) at 150 ℃ for 1min/mm and 5MPa, and finally obtaining the recombined wood.
The density of the reconstituted wood prepared in this example is 1g/cm 3 The water resistance is good, and the thickness and width expansion rate of the recombined wood are respectively 2.3% and 0.4% after 28h circulation (boiling in water at 100 ℃ for 4h, then drying in an oven at 63 ℃ for 20h and boiling in water at 100 ℃ for 4 h) is tested. And the mechanical property is excellent, the static bending strength is 160.6MPa, and the elastic modulus is 16.0GPa. In addition, the airless high-pressure spraying mode adopted in the embodiment has the advantages of high sizing efficiency, less glue loss in the sizing process and less environmental pollution.
The morphology (x 100) of the end face of the reconstituted wood prepared in this example is shown in fig. 1, and it can be seen from the figure that many pores (pointed by arrows) exist on the end face of the reconstituted wood (PS-0.7) prepared from the glued-on pine veneer, and almost no pores are observed on the end face of the reconstituted wood prepared from the glued-on pine veneer. The surface of the veneer is sprayed with glue, the glue solution cannot infiltrate into the veneer from the end face, after glue spraying, phenolic resin is mainly reserved on the surface of the veneer along with the rapid evaporation of water in the glue solution, and during hot pressing, the glue solution gradually infiltrates into the veneer from the surface of the veneer along with the steam. As more pores are observed on the end face of the PS-0.7, the distribution of phenolic resin in the cell cavity is less after hot pressing of the glue-sprayed veneer, and the phenolic resin is mainly distributed on the surface or inside the cell wall, so that the water resistance of the PS-0.7 is better.
Example 2
The embodiment provides a preparation method of recombined wood, which comprises the following steps:
step one, preparing a wood thin veneer: firstly cutting log into wood segments, then softening to improve the plasticity of the wood, then peeling bark, determining the rotary cutting rotation center of the wood segments, rotary cutting the wood segments into wood thin veneers with the thickness of 0.6mm, and drying for later use;
step two, spraying adhesive on the two sides of the wood thin veneer: and diluting the phenolic resin until the solid content is 20%, and performing double-sided adhesive spraying in an airless high-pressure spraying mode, wherein the sizing amount is controlled to be 20%. After glue spraying, the veneer is horizontally placed so that glue solution permeates into the veneer, and after the glue solution is fully absorbed, the water content of the glued veneer is dried to 10%;
step three, veneer assembly and hot pressing gluing: and placing the veneers with good quality on the upper and lower surfaces of the slab by adopting a smooth grain assembly mode. Hot pressing process parameters: and (3) at 150 ℃ for 1min/mm and 4MPa, and finally obtaining the recombined wood.
The density of the reconstituted wood prepared in this example is 1g/cm 3 The water resistance is good, and the thickness and width expansion rate of the recombined wood are 2.0% and 0.3% respectively after 28h circulation is tested. And the mechanical property is excellent, the static bending strength is 176.2MPa, and the elastic modulus is 18.8GPa. In addition, the airless high-pressure spraying mode adopted in the embodiment has the advantages of high sizing efficiency, less glue loss in the sizing process and less environmental pollution.
Example 3
The embodiment provides a preparation method of recombined wood, which comprises the following steps:
step one, preparing a wood thin veneer: firstly cutting log into wood segments, then softening to improve the plasticity of the wood, then peeling bark, determining the rotary cutting rotation center of the wood segments, rotary cutting the wood segments into wood thin veneers with the thickness of 1.3mm, and drying for later use;
step two, spraying adhesive on the two sides of the wood thin veneer: and diluting the phenolic resin until the solid content is 30%, and performing double-sided adhesive spraying in an airless high-pressure spraying mode, wherein the sizing amount is controlled to be 13%. After glue spraying, the veneer is horizontally placed so that glue solution permeates into the veneer, and after the glue solution is fully absorbed, the water content of the glued veneer is dried to 10%;
step three, veneer assembly and hot pressing gluing: and placing the veneers with good quality on the upper and lower surfaces of the slab by adopting a smooth grain assembly mode. Hot pressing process parameters: and (3) at 150 ℃ for 1min/mm and 6MPa, and finally obtaining the recombined wood.
The density of the reconstituted wood prepared in this example is 1g/cm 3 The water resistance is good, and the thickness and width expansion rate of the recombined wood are 2.6% and 0.7% respectively after 28h circulation is tested. And the mechanical property is excellent, the static bending strength is 153.6MPa, and the elastic modulus is 15.2GPa. In addition, the airless high-pressure spraying mode adopted in the embodiment has the advantages of high sizing efficiency, less glue loss in the sizing process and less environmental pollution.
Comparative example 1
The comparative example provides a method for preparing recombinant wood, comprising the following steps:
step one, preparing a wood thin veneer: firstly cutting log into wood segments, then softening to improve the plasticity of the wood, then peeling bark, determining the rotary cutting rotation center of the wood segments, rotary cutting the wood segments into wood thin veneers with the thickness of 1mm, and drying for later use;
step two, gum dipping of the wood thin veneer: diluting phenolic resin to a solid content of 25%, immersing the wood thin veneer until the gum dipping amount is 16%, and then taking out and drying until the water content is 11%;
step three, veneer assembly and hot pressing gluing: and placing the veneers with good quality on the upper and lower surfaces of the slab by adopting a smooth grain assembly mode. Hot pressing process parameters: and (3) at 150 ℃ for 1min/mm and 5MPa, and finally obtaining the recombined wood.
The density of the recombinant wood prepared in this comparative example was 1g/cm 3 . After 28h circulation, the thickness and width expansion rates of the recombined wood are 3.2% and 0.7%, respectively. And the mechanical property is excellent, the static bending strength is 105.6MPa, the elastic modulus is 14.3GPa, and the shearing strength is 11.9MPa.
The morphology of the end face of the reconstituted wood prepared in this comparative example is shown in fig. 1, and it can be seen from the figure that many pores exist on the end face of the reconstituted wood (PS-0.7) prepared from the glued-on pine veneer, whereas almost no pores are observed on the end face of the reconstituted wood prepared from the glued-on pine veneer.
Comparative example 2
The comparative example provides a method for preparing recombinant wood, comprising the following steps:
step one, preparing a wood thin veneer: firstly cutting log into wood segments, then softening to improve the plasticity of the wood, then peeling bark, determining the rotary cutting rotation center of the wood segments, rotary cutting the wood segments into wood thin veneers with the thickness of 1mm, and drying for later use;
step two, spraying adhesive on the two sides of the wood thin veneer: and diluting the phenolic resin until the solid content is 25%, and adopting an air spraying mode to spray the double-sided adhesive, wherein the sizing amount is controlled to be 16%. After glue spraying, the wood thin veneer is horizontally placed so that glue solution permeates into the veneer, and after the glue solution is fully absorbed, the water content of the glued veneer is dried to 11%;
step three, veneer assembly and hot pressing gluing: and placing the veneers with good quality on the upper and lower surfaces of the slab by adopting a smooth grain assembly mode. Hot pressing process parameters: and (3) at 150 ℃ for 1min/mm and 5MPa, and finally obtaining the recombined wood.
The density of the recombinant wood prepared in this comparative example was 1g/cm 3 . After 28h circulation, the thickness and width expansion rates of the recombined wood are 2.3% and 0.4%, respectively. Static bending strength is 157.6MPa, and elastic modulus is 16.0GPa. In addition, the comparative example adopts an air spraying mode, the sizing efficiency is low, the glue solution loss in the sizing process is large, and the environmental pollution is large.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The preparation method of the high-water-resistance recombined wood is characterized by comprising the step of spraying double-sided adhesive on a thin wood veneer.
2. The method for preparing the recombined wood with high water resistance according to claim 1, wherein the double-sided adhesive spraying is performed by adopting an airless high-pressure spraying mode.
3. The method for preparing the high-water-resistance reconstituted wood according to claim 2, wherein the colloid is a phenolic resin adhesive with a solid content of 20-30%, and the sizing amount is controlled to be 13-20% of the mass of the wood veneer.
4. The method for preparing high water resistance reconstituted wood according to claim 3, wherein after spraying glue, the wood veneer is horizontally placed until glue solution is absorbed, and then dried until the water content is 10-12%.
5. The method for producing a high water resistance recombined wood according to any one of claims 1 to 4, further comprising assembling and hot-press gluing the glue-sprayed dried wood veneer.
6. The method for producing a high water resistant reconstituted wood according to claim 5, wherein the hot press gluing conditions include: the hot pressing temperature is 150+/-5 ℃, the hot pressing pressure is 4-6MPa, and the hot pressing time is 1+/-0.1 min/mm.
7. The method for producing a high water resistance recombined wood according to any one of claims 1 to 4, characterized in that the thickness of the wooden veneer is 0.6 to 1.3mm.
8. The method for preparing high water resistance reconstituted wood according to claim 7, wherein the preparation of the wood veneer comprises: cutting log into log segments, softening, removing bark, determining rotary cutting center, rotary cutting into 0.6-1.3mm thick wood veneer, and drying.
9. A high water resistant reconstituted wood prepared by the method of any one of claims 1-8.
10. The high water resistant reconstituted wood according to claim 9, wherein the high water resistant reconstituted wood has a thickness expansion ratio of not more than 2.6% and a width expansion ratio of not more than 0.7% after 28 hours of circulating water boiling treatment.
CN202211538181.4A 2022-12-01 2022-12-01 High-water-resistance recombined wood and preparation method thereof Pending CN116038847A (en)

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Application Number Priority Date Filing Date Title
CN202211538181.4A CN116038847A (en) 2022-12-01 2022-12-01 High-water-resistance recombined wood and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211538181.4A CN116038847A (en) 2022-12-01 2022-12-01 High-water-resistance recombined wood and preparation method thereof

Publications (1)

Publication Number Publication Date
CN116038847A true CN116038847A (en) 2023-05-02

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