CN214528796U - Basha wood-like light high-strength composite section - Google Patents
Basha wood-like light high-strength composite section Download PDFInfo
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- CN214528796U CN214528796U CN202120370204.XU CN202120370204U CN214528796U CN 214528796 U CN214528796 U CN 214528796U CN 202120370204 U CN202120370204 U CN 202120370204U CN 214528796 U CN214528796 U CN 214528796U
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Abstract
The utility model discloses an imitative basha wood light high strength composite profile, composite profile includes that natural fiber sandwich layer and foamed resin are outer, foamed resin is outer to be located the natural fiber sandwich layer is outside, just foamed resin outer with the natural fiber sandwich layer bonding is fixed. The section of the composite section bar is round, square, rectangular, triangular or other irregular shapes. The utility model provides a composite section bar has the characteristic of light weight excellence approximate with basha wood, but can the large-scale production, and the cost only has 1/20 of basha wood. And the composite section material is uniform, and the defect of non-uniform quality of the balsa wood is overcome. In addition, the composite section bar can be directly produced in a set shape without secondary processing, so that the time and labor are saved, and the utilization rate of materials is improved.
Description
Technical Field
The utility model relates to a composite section bar especially relates to an imitative basha wood light high strength composite section bar.
Background
Balsa Wood (also known as Balsa Wood), a light Wood growing in tropical forests of america, is one of the fastest growing trees and is the lightest Wood in the world. The weight of each cubic meter of the balsa wood is only 0.105 ton, which is one tenth of the weight of the same volume of water. The poplar used for making match sticks is also three and a half times heavier than the poplar.
The wood of the balsa wood has light texture but high strength of 40MPa, and has firm structure. Therefore, balsa wood is a valuable material for aviation, navigation and other specialty processes. Therefore, the price of the balsa is very high, and the price of the balsa per cubic meter in China is as high as 2 ten thousand RMB.
To sum up, the utility model discloses the people finds that above-mentioned technique has following technical problem at least at the in-process that realizes this application embodiment technical scheme:
the yield of the balsa is limited, and the bata cannot meet the large-batch use requirement. Meanwhile, the price of balsa is very high, resulting in high cost of the product.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application solves the problems that the yield of the balsa wood is limited and the use requirements of large batch cannot be met in the prior art by providing the balsa wood-imitating light high-strength composite section; meanwhile, the price of the balsa wood is very high, which causes the technical problem of very high cost of products, and the artificial light high-strength composite section bar is provided, has the characteristics of light weight and high strength similar to the balsa wood, can be produced in a large scale and has very low cost.
The embodiment of the application provides an imitative basha wood light weight high strength composite profile, including natural fiber sandwich layer and foamed resin skin, the foamed resin skin is located the natural fiber sandwich layer is outside, just the foamed resin skin with the natural fiber sandwich layer bonding is fixed.
Preferably, the natural fiber core layer is any one or a combination of a plurality of cotton fiber core layers, hemp fiber core layers, silk fiber core layers, palm fiber core layers and bamboo fiber core layers.
Preferably, the foamed resin outer layer is any one or a combination of more of a foamed epoxy resin outer layer, a foamed unsaturated polyester outer layer, a foamed phenolic resin outer layer and a foamed thermosetting polyolefin resin outer layer.
Preferably, the cross section of the composite profile is circular, square, rectangular, triangular or other irregular shape.
The embodiment of the application also provides a preparation method of the balsa wood-imitated light high-strength composite section, which comprises the following steps: the natural fiber is taken as a reinforcing material, the resin is taken as a crosslinking agent, and the natural fiber and the resin are compounded through a pultrusion process;
the resin is added with a foaming agent.
Preferably, the preparation method comprises the following steps:
adding foaming agent into the resin to make the foaming agent completely and uniformly dispersed in the molten resin to prepare glue solution;
uniformly dipping the natural fibers in the prepared glue solution;
the impregnated natural fiber gradually becomes the shape of the section bar, and simultaneously, redundant glue solution is extruded;
the dipped natural fiber which becomes the shape of the section enters a forming die, is heated and is cured and formed in the forming die;
and pulling out the solidified and molded section from the molding die, and cutting to obtain the balsa wood-imitated light high-strength composite section.
Further, the foaming agent is any one of diformamide, ammonium bicarbonate and sodium bicarbonate.
Furthermore, when preparing glue solution, auxiliary materials are added into the resin;
the auxiliary materials are one or more of a release agent, a curing agent, a catalyst, a mold sealing agent, a UV light stabilizer, a toughening agent and a diluent.
Furthermore, the heating temperature of the forming die is 80-140 ℃.
Furthermore, the cut section bar is placed in a thermostatic chamber at the temperature of 60-70 ℃ for 24-48 hours so as to improve the strength of the section bar.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. the application provides an artificial light high-strength composite section which has the characteristics of light weight and high strength similar to those of balsa wood, but can be produced in a large scale, and meanwhile, the cost is very low and is only 1/20 of the balsa wood.
2. Balsa is a natural wood with many concentric rings visible in its cross-section, known as the annual rings in botanicals. Therefore, the balsa wood has the defect of uneven material, and the density of the balsa wood is smaller and smaller along the direction from the outside to the center of a circle of the cross section of the balsa wood. The balsa wood-imitated light high-strength composite section provided by the application is uniform in material, and the defect of non-uniformity of balsa wood is overcome.
3. The cross section of the natural balsa wood is usually round or round-like, and when the balsa wood is used for making a section bar with a specific shape, the balsa wood needs to be cut and processed into the specific shape, which is time-consuming and labor-consuming and also causes material waste. And the imitation balsa wood light high-strength composite section provided in the application can be directly produced in a set shape without secondary processing, thereby not only saving time and labor, but also improving the utilization rate of materials.
4. This application improves on current FRP combined material's basis, adopts natural fibre to replace traditional carbon fiber, glass fiber, aramid fiber, and natural fibre has the advantage that density is little, the quality is light, also can play the effect of reinforcing intensity simultaneously. Furthermore, a foaming agent is added into the resin, and other auxiliary materials are added to prepare a foaming type pultrusion section, the density and the strength of the section are similar to those of the balsa wood, and meanwhile, the material is more uniform than that of the balsa wood, so that the foaming type pultrusion section can be used in place of the balsa wood in actual production.
Drawings
Fig. 1 is a schematic structural diagram of a balsa wood-like light high-strength composite profile provided in a first embodiment of the present application;
fig. 2 is a flowchart of a method for preparing a balsa wood-like light-weight high-strength composite profile provided in the second embodiment of the present application.
Detailed Description
The embodiment of the application solves the problems that the yield of the balsa wood is limited and the use requirements of large batch cannot be met in the prior art by providing the balsa wood-imitating light high-strength composite section; meanwhile, the price of the balsa wood is very high, which causes the technical problem of very high cost of the product.
In order to solve the problem of crosstalk, the technical scheme in the embodiment of the present application has the following general idea:
FRP (Fiber Reinforced Plastics) has the characteristics of light weight, hardness, non-conductivity, high mechanical strength, less recycling, corrosion resistance and the like.
The FRP composite material is a high-performance material formed by mixing a fiber material and a matrix material according to a certain proportion. The main FRP materials commonly used in engineering structures mainly comprise Carbon Fiber (CFRP), Glass Fiber (GFRP), Aramid Fiber (AFRP) and the like.
The density of the carbon fiber is 1.8g/cm3The density of the glass fiber is 2.4-2.76 g/cm3The density of the meta-aramid fiber is 1.37-1.38 g/cm3The density of the para-aramid fiber is 1.44g/cm3. The density of the fibers is greater than that of balsa wood.
The embodiment of the application is improved on the basis of the existing FRP composite material, and the natural fiber is adopted, has the advantages of small density and light weight, and can also play a role in enhancing the strength.
Based on natural fiber and resin, the composite pultrusion profile is prepared by a pultrusion process, has much lighter weight than common CFRP, GFRP and AFRP profiles in engineering structures, and is 0.6 ton/m3Left and right, but still much heavier than balsa.
On this basis, the utility model discloses the people continues to improve, adds the foamer in the resin, and other auxiliary material of assistance make a foaming type pultrusion section bar, this section bar density is similar with basha wood. The balsa wood-imitating light high-strength composite section is successfully prepared.
Specifically, natural fiber refers to fiber obtained from natural sources or directly from artificially cultivated plants or artificially cultured animals. Such as: cotton fiber, hemp fiber, silk fiber, palm fiber, bamboo fiber, etc.
The resin can be selected from epoxy resin, unsaturated polyester, phenolic resin, etc.
Preferably, the resin is thermosetting polyolefin resin, such as cyclopentadiene CPD, dicyclopentadiene DCPD, tricyclopentadiene TCPD, polydicyclopentadiene PDCPD, polytrietadiene PTCPD and compound thereof.
The foaming agent is any one of diformamide, ammonium bicarbonate and sodium bicarbonate.
The auxiliary materials are one or more of a mold release agent, a curing agent, a catalyst, a mold sealing agent, a UV light stabilizer, a toughening agent and a diluent.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example one
Fig. 1 is a schematic structural diagram of the balsa wood-like light high-strength composite profile provided in this embodiment, the balsa wood-like light high-strength composite profile includes a natural fiber core layer 1 and a foamed resin outer layer 2, the foamed resin outer layer 2 is disposed outside the natural fiber core layer 1, and the foamed resin outer layer 2 is bonded and fixed with the natural fiber core layer 1. The foaming resin outer layer 2 is internally provided with a plurality of foaming hole bodies.
Specifically, the natural fiber core layer 1 is any one or a combination of several of a cotton fiber core layer, a hemp fiber core layer, a silk fiber core layer, a palm fiber core layer and a bamboo fiber core layer.
The foaming resin outer layer 2 is any one or a combination of a plurality of foaming epoxy resin outer layers, foaming unsaturated polyester outer layers, foaming phenolic resin outer layers and foaming thermosetting polyolefin resin outer layers.
Furthermore, the cross section of the balsa wood-like light high-strength composite section is round, square, rectangular, triangular or other irregular shapes, and can be set randomly according to needs.
Further, the density of the balsa wood-like light high-strength composite section is 0.1-0.15 ton/m3Close to balsa wood.
Furthermore, the strength of the light high-strength composite profile imitating the balsa wood is 38-42 MPa and is close to that of the balsa wood.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
1. the application provides an artificial light high-strength composite section which has the characteristics of light weight and high strength similar to those of balsa wood, but can be produced in a large scale, and meanwhile, the cost is very low and is only 1/20 of the balsa wood.
2. Balsa is a natural wood with many concentric rings visible in its cross-section, known as the annual rings in botanicals. Therefore, the balsa wood has the defect of uneven material, and the density of the balsa wood is smaller and smaller along the direction from the outside to the center of a circle of the cross section of the balsa wood. The balsa wood-imitated light high-strength composite section provided by the embodiment is uniform in material quality, and the defect of non-uniform quality of balsa wood is overcome.
3. The cross section of the natural balsa wood is usually round or round-like, and when the balsa wood is used for making a section bar with a specific shape, the balsa wood needs to be cut and processed into the specific shape, which is time-consuming and labor-consuming and also causes material waste. The balsa wood-like light high-strength composite section provided in the embodiment can be directly produced in a set shape without secondary processing, so that not only is time and labor saved, but also the utilization rate of the material is improved.
Example two
Fig. 2 is a flowchart of a method for preparing an imitation balsa wood light high-strength composite profile provided in an embodiment of the present application, and the method for preparing the imitation balsa wood light high-strength composite profile includes the steps of:
step S100: yarn row
The yarn arrangement is a process of leading natural fibers arranged on a creel out of a yarn barrel and uniformly and neatly arranging the natural fibers. When natural fiber is conveyed and arranged, in order to arrange yarn smoothly, a rotary mandrel is generally adopted, and the natural fiber is led out from the outer wall of a yarn barrel, so that the twisting phenomenon can be avoided.
Step S200: preparing glue solution
Adding foaming agent and auxiliary material into the resin to make the foaming agent and auxiliary material completely and uniformly dispersed in the molten resin to prepare glue solution;
step S300: resin impregnation
The natural fibers which are arranged orderly are evenly dipped with the prepared glue solution, and the natural fibers are generally processed by passing through a tank filled with the glue solution. During the whole impregnation process, the natural fibers must be ensured to be aligned.
Step S400: preforming
The pre-impregnated natural fibers are run through the pre-form die in a continuous manner to ensure their respective positions, through which the pre-impregnated natural fibers are gradually transitioned into the shape of the profile while excess resin is extruded.
The preforming mold is used to further homogenize the natural fiber impregnated with resin and to remove excess resin, so that the shape of the preforming mold is gradually formed into the shape of the inlet of the forming mold. When the round pipe is pultruded, a circular ring-shaped preforming mold is used; when the hollow section is manufactured, a preforming mold with a core mold is used; when producing the profile, a metal preforming die with the shape close to the section shape of the profile is used.
Step S500: moulding and curing
The dipped natural fiber which becomes the shape of the section enters a forming die, is heated and is cured and formed in the forming die.
The heating temperature of the forming die is designed according to the curing process, mainly according to the heat release curve of the resin in curing and the friction performance of the material and the die.
The length of the forming die is determined by the curing time and the drawing speed. The length range of the forming die is 500-1500 mm. The forming die is divided into three distinct heating zones: a preheating zone, a gel zone, and a curing zone to control the curing rate.
There is a certain distance between the outlet of the forming die and the traction device, and a cooling system, such as an air cooling system or a circulating water cooling system, is arranged at the distance for cooling the section.
Step S600: traction cutting
The traction device is a crawler-type tractor or a hydraulic drawing machine, and the traction device pulls the solidified profile out of the die. And cutting the drawn section bar according to a set length.
Step S700: constant temperature curing
The light high-strength composite profile of the simulated balsa wood from the pultrusion production line is in a hardening stage, and the cut profile needs to be put into a thermostatic chamber for continuous solidification for a period of time, so that the strength of the profile is further improved.
Placing the mixture in a thermostatic chamber at the temperature of 60-70 ℃ for 24-48 hours.
Based on the above method, specific test examples were conducted as follows.
As can be seen from the above table, the density and the strength of the balsa wood-like light high-strength composite section prepared by the method provided by the embodiment are both close to those of balsa wood, and the material quality is more uniform than that of balsa wood, so that the balsa wood-like light high-strength composite section can be used in place of balsa wood in actual production.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
this application improves on current FRP combined material's basis, adopts natural fibre to replace traditional carbon fiber, glass fiber, aramid fiber, and natural fibre has the advantage that density is little, the quality is light, also can play the effect of reinforcing intensity simultaneously. Furthermore, a foaming agent is added into the resin, and other auxiliary materials are added to prepare a foaming type pultrusion section, the density and the strength of the section are similar to those of the balsa wood, and meanwhile, the material is more uniform than that of the balsa wood, so that the foaming type pultrusion section can be used in place of the balsa wood in actual production.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. Those skilled in the art can make various changes, modifications and equivalent arrangements to those skilled in the art without departing from the spirit and scope of the present application; moreover, any equivalent alterations, modifications and variations of the above-described embodiments according to the spirit and techniques of this application are intended to be within the scope of the claims of this application.
Claims (4)
1. The balsa wood-like light high-strength composite section is characterized by comprising a natural fiber core layer and a foamed resin outer layer, wherein the foamed resin outer layer is arranged outside the natural fiber core layer, and the foamed resin outer layer is fixedly bonded with the natural fiber core layer.
2. The basmati-like light-weight high-strength composite profile as claimed in claim 1, wherein the natural fiber core layer is any one or a combination of a plurality of cotton fiber core layers, hemp fiber core layers, silk fiber core layers, palm fiber core layers and bamboo fiber core layers.
3. The simulated balsa wood light-weight high-strength composite section bar as claimed in claim 1, wherein the foamed resin outer layer is any one or a combination of a plurality of foamed epoxy resin outer layers, foamed unsaturated polyester outer layers, foamed phenolic resin outer layers and foamed thermosetting polyolefin resin outer layers.
4. The simulated balsa wood light-weight high-strength composite profile as claimed in claim 1, wherein the cross section of the composite profile is circular, square, rectangular or triangular.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112812502A (en) * | 2021-02-10 | 2021-05-18 | 上海东杰高分子材料有限公司 | Basha wood-like light high-strength composite section and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112812502A (en) * | 2021-02-10 | 2021-05-18 | 上海东杰高分子材料有限公司 | Basha wood-like light high-strength composite section and preparation method thereof |
| CN112812502B (en) * | 2021-02-10 | 2024-01-30 | 上海东杰高分子材料有限公司 | Bassa-like light high-strength composite profile and preparation method thereof |
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