CN114213685A

CN114213685A - Wood compaction composite profile using artificial fiber material for compaction and reinforcement of natural fiber

Info

Publication number: CN114213685A
Application number: CN202111327061.5A
Authority: CN
Inventors: 郑玉槟; 周长东; 王�忠
Original assignee: Beijing Jiaotong University
Current assignee: Beijing Jiaotong University
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-03-22

Abstract

The invention provides a wood compaction composite profile for compacting and reinforcing natural fibers by applying artificial fiber materials. This composite profile includes: adding artificial fiber into natural fiber for compacting and compounding; designing templates according to different sizes; dipping the artificial and natural fibers in a resin solution until the surfaces thereof are wet; arranging a full length artificial fiber material in the natural fiber; placing the natural fibers with the artificial fibers together on the template for compacting; the resin glues the artificial fiber and the natural fiber; the artificial fiber, the resin and the natural fiber form the wood compact composite section. The wood compact composite section can be used for building structure construction and structure reinforcement; the wood compaction composite profile keeps the texture of natural fibers, and meanwhile, the strength, fire resistance and other properties of the wood compaction composite profile can be effectively improved when high-strength artificial fibers are laid between the natural fibers.

Description

Wood compaction composite profile using artificial fiber material for compaction and reinforcement of natural fiber

Technical Field

The invention relates to the field of composite materials, in particular to a wood compaction composite board profile using artificial fiber for compacting and reinforcing natural fibers.

Background

The wood material is the only renewable building material, has excellent durability, environmental friendliness, shock resistance and the like, and is widely applied to ancient buildings and modern building structures. In the background of the subject of sustainable development in society today, wood materials will be a considerable part of the construction materials today. However, at present, wood materials such as laminated wood, laminated bamboo, plasticized wood and the like which are widely applied have the phenomenon that the strength is insufficient, so that the application range of the wood materials is greatly limited; and wood composites glued using large amounts of glue are often accompanied by the production of hazardous substances, which is contrary to the environmental friendliness of wood. And the mechanical property of the wood material can be effectively improved by compacting and reinforcing the wood material. The artificial fiber is used for compacting and enhancing the natural fiber, so that the strength of the wood material is enhanced, and meanwhile, the artificial fiber can further enhance the wood material; the natural fibers are randomly arranged, the colloid exists on the surfaces of the fibers, and the excessive colloid can be effectively reduced in the compacting process; and the natural fiber material required by the composite material has flexible size, can obtain wood fiber by extracting wood leftover materials, and can also obtain bamboo fiber by extracting bamboo materials, thereby effectively reducing the loss of wood materials. Therefore, the artificial fiber is used for compacting and reinforcing natural fibers such as wood materials and the like on the premise of using a small amount of glue, and has important significance.

Traditional wood materials include laminated wood, laminated bamboo, reconstituted wood, reconstituted bamboo, plasticized wood and the like, and materials made from these wood substrates, the strength of which is limited by the strength of natural fibers; fiber-reinforced polymer (FRP) is only made of artificial Fiber, and the size of the material is limited; the appearance of the wood composite material reinforced by the composite materials such as fiber, reinforcing steel bar and the like is greatly changed. These wood composites and reinforcement all improve the force characteristics of wood materials to varying degrees, but at the same time these reinforcement methods suffer from the phenomenon of extensive use of chemical colloids and require the raw material to be a full size wood material. At the same time, these reinforcing measures do not enhance the strength of the wood material itself, and the strength of composites reinforced with other materials is still limited by the strength of the wood material and the bond interface. Therefore, under the premise of using a small amount of colloid, the artificial fiber material is adopted to compact and reinforce the natural fiber to form the wood compact composite section. The strength of natural fiber sectional materials such as wood materials and the like can be enhanced, the mechanical property of the natural fiber sectional materials such as the wood materials and the like can be further enhanced by using artificial fibers, and wood compact composite sectional materials with various shapes can be created according to a mold. The invention is based on the compaction composite technology, and adopts artificial fiber materials to carry out compaction to reinforce natural fiber materials to form the high-strength wood compaction composite section.

At present, no wooden compaction composite section which adopts artificial fiber for compaction and reinforcement of natural fiber and simultaneously adopts artificial fiber material for compaction and reinforcement of natural fiber exists in the prior art.

Disclosure of Invention

The embodiment of the invention provides a wood compaction composite profile for compacting and reinforcing natural fibers by applying an artificial fiber material so as to effectively reinforce natural fiber materials such as wood materials and the like.

In order to achieve the purpose, the invention adopts the following technical scheme.

A wood-based densified composite profile using artificial fiber material to densify natural fibers, comprising:

adding artificial fiber materials into natural fibers for compaction compounding, designing compaction templates according to different size requirements, and placing the fiber materials added with the artificial fibers in the templates for compaction compounding to form a wood compaction composite profile;

the natural fiber needs to be dried to reduce the water content;

dipping the dried natural fiber in acetone resin solution until the surface of the natural fiber is adhered with resin;

and placing the artificial fiber material with the resin attached to the surface into the natural fiber with the resin attached to the surface.

Further, the natural fibers may be adjustable in size and the natural fiber orientation may be randomly placed.

Further, the artificial fibers are arranged in the wood compaction composite material section in a through-length mode, and the length direction of the artificial fibers is used as the length direction of the wood compaction composite material section after compaction.

Further, the content and arrangement position of the artificial fiber can be adjusted.

Further, the shape and the size of the wood compaction composite profile can be adjusted according to the template.

Further, the natural fibers and the artificial fibers are compacted and glued together by pressure and a small amount of resin to form a composite material.

Further, a small amount of colloid exists among the components of the wood compact composite profile, so that the compactness and the volume stability of the wood compact composite profile are maintained.

The technical scheme provided by the embodiment of the invention shows that the invention is suitable for producing high-strength wood compact composite profile members; structural system components suitable for large span and buildings with spacious space structures; meanwhile, the method is suitable for wall filling of building structures, decoration system components such as tiles and the like; and is suitable for the structure reinforcing members such as the historic wood building, the concrete structure, the steel structure and the like; it is also suitable for manufacturing components of wooden furniture and the like.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

Fig. 1 is a schematic view of a wood-based compact composite profile using artificial fiber material to compact and reinforce natural fibers according to an embodiment of the present invention.

Fig. 2 shows a dried natural fiber without densification according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of the artificial and natural fibers impregnated in a resin solution according to an embodiment of the present invention.

FIG. 4 is a schematic view of the artificial fiber material provided by the embodiment of the present invention being placed in the natural fiber which has sufficiently absorbed the resin solution.

Fig. 5 is a schematic cross-sectional view of a wood-based compression composite profile according to an embodiment of the present invention before and after compression.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.

Example one

In order to overcome the strength deficiency of the traditional wood material and enhance the strength of the wood fiber composite material, the embodiment of the invention provides a wood compaction composite section which adopts artificial fiber to compact and enhance wood fiber on the premise of using a small amount of glue so as to achieve high strength and high density.

The invention provides a wood compaction composite profile compacted and reinforced by applying artificial fiber materials. This composite profile includes: adding artificial fiber material into natural fiber for compacting and compounding; designing a compaction template according to different size requirements; dipping the artificial and natural fibers in a resin solution; arranging a full length artificial fiber material in the natural fiber; compacting the natural fiber materials finished by arranging the artificial fiber materials together; the resin glues the artificial fiber and the natural fiber; the artificial fiber, the resin solution and the natural fiber form the wood compact composite section. The wood compact composite section can be used for reinforcing and constructing building structures; the wooden compaction composite section bar keeps the natural excellence of wood, and meanwhile, the high-strength artificial fiber is filled in gaps among natural fibers, so that the strength, the fire resistance and other properties of the wooden compaction composite section bar can be effectively improved.

In practical application, templates with reasonable sizes, artificial fibers and natural fibers with reasonable quantities can be selected according to the sizes of the building structural members and the main stress characteristics. Further, the natural fiber is impregnated in the resin solution, thereby arranging the artificial fiber in the natural fiber. Further, the artificial fiber and the natural fiber are compacted and formed through a pressure device.

The invention selects artificial fiber as the main material for compaction reinforcement. The artificial fiber mainly comprises carbon fiber, glass fiber, basalt fiber, aramid fiber and the like, and the artificial fiber material has excellent performance parameters. The performance parameters of the artificial fiber material are as follows: the strength, density, corrosion resistance and the like of the artificial fiber material. When the wood compact composite section is prepared, the geometric parameters of the required template are designed according to the size and the stress characteristics of the structural member. The geometric parameters of the template refer to: the length, width, thickness and other geometric parameters of the wood compact composite section bar.

The natural fiber material refers to wood fiber, bamboo fiber and other natural fibers. The geometric size parameters of the natural fibers are not unique, and the natural fibers can be graded and can also be unified in size. The wood fibers with different grading have different compaction degrees in the compacting process, and each grading can also be used for the compactness of the wood compacted composite section. The wood fiber size grading parameters are designed according to the density of the required compacted profile. The wood fiber size grading parameter refers to the proportion of wood fibers of different sizes.

The resin solution means a solution containing a resin, and the solvent used has a characteristic of dissolving the resin without damaging the fiber. The resin solution is actually used for coating resin on the surface of the wood fiber as an adhesive, and the resin adhesive can be uniformly adhered to the surface of the wood fiber by soaking the fiber in the resin solution with a certain concentration. The resin solution with a certain concentration refers to a resin solution prepared according to a weight ratio.

Artificial fiber, wood fiber material and resin are compounded and shaped in a compaction mode; the excess resin can be extruded out by applying pressure through the pressure device for compaction, so that the using amount of the resin is effectively reduced without reducing the composite effect. The gap between the artificial fiber and the wood fiber material is extruded and compacted by the pressure device, and the artificial fiber and the wood fiber material are glued by resin, so that a completely compacted wood compaction composite section is formed.

The arrangement of the artificial fibers is arranged according to the stress characteristics of the building structural members, and the artificial fibers can be symmetrically arranged on one side or two sides.

The concentration of the resin solution is designed by considering the gluing performance among wood fiber materials and between wood fibers and artificial fibers, and the reasonable concentration of the resin not only ensures the firm bonding of the materials, but also effectively controls the resin content in the wood compaction composite profile and ensures the environment-friendly characteristic of the wood compaction composite profile.

The pressure device comprises a device capable of continuously and stably applying pressure and a size-stable template.

The density of the wood compaction composite section material after compaction is obviously higher than that of the traditional wood material. The microstructure of the wood compact composite section is more compact, and the strength of the material is obviously stronger than that of the traditional wood material.

The wood compact composite section is formed by compacting the template, so that the wood compact composite section has stable overall dimension and compact and smooth member surface. But still of a wooden material and can therefore be glued using structural glue and other members, applied to structural members and reinforcement of structural members etc.

Example two

Fig. 1 is a schematic illustration of a wood compacted composite profile compacted with artificial fiber material to reinforce natural fiber according to an embodiment of the present invention, wherein a template (4 template) of the wood compacted composite profile is designed according to the size of a structural member of a target profile; and calculating the mass of the adopted wood fiber (1 wood fiber and other natural fibers) according to the size and the density of the required target section; sufficient wood fiber is subjected to a drying process to reduce the water content so as to facilitate the absorption of the resin solution (3 resin solution); soaking the dried wood fiber 1 in a resin solution 3 to complete the resin covering of the surface of the wood fiber 1; the impregnated wood fiber 1 is placed in a form 4, and a full length carbon fiber (2 artificial fiber such as carbon fiber) is arranged at an appropriate position of the wood fiber. The wood fiber 1 and the carbon fiber 2 are compacted and compounded through a pressure device (5) to realize the processing of the wood compacted composite section.

Fig. 2 is a natural fiber 1 subjected to drying treatment according to an embodiment of the present invention, where the size of the natural fiber 1 may be configured according to a gradation, or may be arranged in a uniform size; .

Fig. 3 is a schematic diagram of natural fiber 1 impregnated in a resin solution 3 according to an embodiment of the present invention, and the natural fiber 1 and the artificial fiber 2 are impregnated by placing the resin solution 3 in a container of an appropriate size according to the size and quality of the natural fiber 1.

Fig. 4 is a schematic cross-sectional view of a member after completion of compaction of a wood compaction composite profile according to an embodiment of the invention. After the natural fiber 1 is compacted, internal gaps are basically eliminated, the natural fiber 1 and the artificial fiber 2 are bonded more firmly through compaction, and meanwhile, redundant resin glue is extruded out of the wooden compacted composite profile component

The invention is suitable for producing wood composite materials with various shapes, including wood bricks and materials of various parts of wood furniture; and is suitable for the main stress member of the building structure with large span and spacious space requirements; the composite material can also replace the traditional wood material to carry out structural reinforcement and composite reinforcement, and main stress members such as beams and columns and the like, and fire prevention of buildings with high fire-proof grade and spacious space structures; therefore, the composite section bar is suitable for producing some high-strength wooden structural members.

In summary, compared with the existing wood material, the embodiment of the invention has the following advantages:

(1) the wood fiber raw material adopted by the invention can extract wood fiber from waste materials and leftover materials generated in the use process of wood, and can also extract bamboo fiber from bamboo materials, thereby effectively improving the utilization rate of the wood material in application. Compared with wood materials such as laminated wood and the like which need sawn materials with specific sizes, the bamboo fiber is more environment-friendly and has wide applicability.

(2) Compared with other wood composite materials, the wood compact composite section can utilize colloids such as resin more efficiently. The natural fiber is soaked by the solution, so that the colloid particles can be uniformly and comprehensively attached to the surface of the natural fiber, and redundant colloid is extruded in the compaction process. On one hand, the surfaces of all the components of the wood compact composite section are glued with each other by the glue, so that the integrity and the dimensional stability of the composite material are maintained; on the other hand, redundant colloid is extruded, and the naturalness and environmental protection of the natural fiber material are kept to the maximum extent.

The wood compact composite section has no obvious glue interface between the component materials, so that the wood compact composite section has no stress concentration phenomenon caused by the interface in the stress process, and the stress concentration phenomenon can lead to the early damage of the member. This is mainly due to the dipping process, which is more efficient than the traditional gluing and gluing process. Compared with sawn timber and the like, the wood fiber has larger specific surface area, larger gluing area among the constituent materials and better gluing effect, so that the wood compact composite section has higher strength.

(3) The traditional wood composite material can not completely eliminate the defects of raw materials, and the wood compact composite section can basically realize the uniform performance of the material. Since the size of the wood fibers can also be designed in a graded size, fibers of different sizes can fill the gaps with each other during the compacting process.

(4) The wood composite profile has a more flexible size. The size of the wooden composite section can be designed into a template according to requirements, and the wooden compact composite section is produced according to the size and the shape of the template.

(5) The wood compact composite section has clear characteristics and clear engineering applicability, requires high-strength material members for general blocks, and has higher application value for stressed members of large-span structures.

Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A wooden compaction composite profile using artificial fiber material for compaction and reinforcement of natural fibers is characterized by comprising the following components:

drying the artificial and natural fibers to reduce the water content;

dipping the dried artificial and natural fibers in resin solution such as acetone and the like until resin is attached to the surfaces of the fibers;

and placing the artificial fiber material with the resin attached to the surface into the natural fiber with the resin attached to the surface, and putting the artificial fiber material and the natural fiber together into the template for compacting to form the wood compacted composite section.

2. The article of claim 1, wherein the natural fibers are arranged in a length direction and the natural fiber direction may be randomly placed.

3. The content according to claim 2, wherein the artificial fiber is arranged throughout the length of the wood compacted composite profile, and the length direction of the artificial fiber is taken as the length direction of the wood compacted composite profile after compaction.

4. The content of claim 3, wherein the content and the arrangement position of the artificial fiber are adjustable.

5. The method of claim 4, wherein the wood press composite profile is adjustable in shape and size to the form.

6. The content according to claim 2 or 3 or 4 or 5, characterized in that the natural fibers and the artificial fibers are compacted and glued together by pressure and a small amount of resin to form a composite profile.

7. The disclosure of claim 6, wherein a small amount of glue is present between the constituent materials of the wood press composite profile to maintain the compactness and volume stability of the wood press composite profile.

8. A method according to claims 1-7, characterized by compacting the composite reinforcement.