CN115431360B - Profile with modified surface function and surface function modification method thereof - Google Patents
Profile with modified surface function and surface function modification method thereof Download PDFInfo
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- CN115431360B CN115431360B CN202211079633.7A CN202211079633A CN115431360B CN 115431360 B CN115431360 B CN 115431360B CN 202211079633 A CN202211079633 A CN 202211079633A CN 115431360 B CN115431360 B CN 115431360B
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- 238000002715 modification method Methods 0.000 title claims abstract description 6
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 61
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- 230000000694 effects Effects 0.000 claims abstract description 15
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- 238000007906 compression Methods 0.000 claims description 79
- 230000006835 compression Effects 0.000 claims description 76
- 238000000280 densification Methods 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 26
- 238000011282 treatment Methods 0.000 claims description 22
- 238000005299 abrasion Methods 0.000 claims description 12
- 241000219000 Populus Species 0.000 claims description 9
- 238000007731 hot pressing Methods 0.000 claims description 9
- 230000004048 modification Effects 0.000 claims description 8
- 238000012986 modification Methods 0.000 claims description 8
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- 239000003973 paint Substances 0.000 abstract description 6
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- 238000003825 pressing Methods 0.000 description 26
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
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- 229920000877 Melamine resin Polymers 0.000 description 3
- 239000004640 Melamine resin Substances 0.000 description 3
- SYWWQKWQQJTDAM-UHFFFAOYSA-N [O-2].[Al+3].N1=C(N)N=C(N)N=C1N.[O-2].[O-2].[Al+3] Chemical compound [O-2].[Al+3].N1=C(N)N=C(N)N=C1N.[O-2].[O-2].[Al+3] SYWWQKWQQJTDAM-UHFFFAOYSA-N 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000003359 percent control normalization Methods 0.000 description 3
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- 238000012546 transfer Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
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- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
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- 239000004922 lacquer Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Laminated Bodies (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The embodiment of the application discloses a surface function modified profile and a surface function modification method thereof, wherein the surface function modified profile sequentially comprises a wear-resistant particle layer and a wear-resistant reinforcing layer from top to bottom, and the wear-resistant particle layer is in bonding connection with the wear-resistant reinforcing layer; the wear-resistant reinforcing layer is compacted and filled with a molten adhesive penetrating from the wear-resistant particulate layer. The section bar can achieve the effects of paint free and veneer free, and has better wear resistance, longer wear-resisting service life and prolonged service life.
Description
Technical Field
The invention relates to the field of wood functional modified materials, in particular to a surface functional modified profile, and also relates to a method for manufacturing the surface functional modified profile.
Background
The fast-growing wood has rich resources and is a recyclable green material. However, the fast-growing wood has the defects of softer material, lower density and strength, and the like, so the fast-growing wood is mostly made into fibers and shavings for manufacturing artificial boards in practical application, and is rarely used in utilization ways with high added value, such as solid wood utilization. Based on the above, the research on the functional modification of the surface of the fast-growing wood is one of important research directions for improving the application value of the fast-growing wood.
The surface of the fast-growing wood is pressed and stuck with the wear-resistant veneers, which is a means for realizing the surface functional modification. One way is to press the wear-resistant paper of the finished product on the surface of the fast-growing wood after densification. For example, the invention patent with publication number CN102107452B in the chinese patent database, named "a cork solid wood floor and its manufacturing method", discloses a technical scheme for pressing and pasting wear-resistant paper on the surface of a fast-growing wood subjected to surface densification and carbonization treatment, specifically, firstly, the fast-growing wood is subjected to surface densification treatment by hot pressing, then is subjected to co-located hot pressing and carbonization to fix the compression effect, and finally, aluminum oxide-melamine resin impregnated paper is pressed and pasted on the densified surface by hot pressing to form the wear-resistant surface.
Another way is to form a wear-resistant layer on the surface of the fast-growing wood. For example, the invention patent with publication number CN102259450B, entitled "self-abrasion-resistant wood composite material and method for manufacturing the same" discloses a technical scheme for forming an abrasion-resistant surface on the surface of a fast-growing wood, specifically, an adhesive is coated on the surface of the fast-growing wood, abrasion-resistant particles (such as aluminum oxide particles, silicon dioxide particles, aluminum hydroxide particles, or silicon carbide particles) are paved by air flow, then the surface with the abrasion-resistant particles is coated again, and finally an abrasion-resistant coating is formed on the surface of the fast-growing wood.
However, it will be appreciated by those skilled in the art that the first approach described above has the problem of weak bond strength between the wear resistant paper and the fast growing substrate. The density of the wear-resistant paper is relatively high, the surface of the wood is hydrophobic after hot pressing and carbonization, and the adhesive in the wear-resistant paper is not easy to permeate the surface of the wood when the wear-resistant paper is hot pressed and pasted, so that the bonding strength between the wear-resistant paper and the fast-growing wood substrate is relatively weak. The second mode has the problems of complex process and possibly uneven distribution of the wear-resistant particles under the action of air flow. Meanwhile, the secondary coating performed to ensure the adhesion effect of the wear-resistant particles on the surface of the rapid-growth material may result in relatively small number of exposed wear-resistant particles, which may affect the actual wear-resistant effect.
Disclosure of Invention
The invention aims to overcome the technical problems and provide a surface function modified profile; the invention also provides a method for manufacturing the surface function modified profile.
In order to achieve the above purpose, the embodiment of the invention provides a surface function modified profile, which sequentially comprises a wear-resistant particle layer and a wear-resistant reinforcing layer from top to bottom, wherein the wear-resistant particle layer is in bonding connection with the wear-resistant reinforcing layer; the wear-resistant reinforcing layer is compacted and filled with a molten adhesive penetrating from the wear-resistant particulate layer.
Preferably, the profile further comprises a densified compression layer located inside and connected to the wear-resistant reinforcement layer.
Preferably, the profile further comprises a raw density layer; the original density layer is positioned on the inner side of the wear-resistant reinforcing layer and connected with the wear-resistant reinforcing layer, or
The original density layer is positioned on the inner side of the densification compression layer and is connected with the densification compression layer.
Preferably, the wear-resistant particle layer and the wear-resistant reinforcing layer are positioned on the same side plate surface of the profile.
In order to achieve the above object, an embodiment of the present invention further provides a process for modifying a surface function of a profile, including a densification treatment step of hot-pressing a profile by a hot plate, covering a plate surface of the profile with wear-resistant paper, and then performing the densification treatment step on the profile to form a wear-resistant particle layer and a wear-resistant reinforcing layer on the profile; the wear-resistant particle layer is formed by melting and resolidifying the wear-resistant paper and is in bonding connection with the wear-resistant reinforcing layer; the wear-resistant reinforcing layer is subjected to densification and compression and is filled with a molten adhesive that penetrates from the wear-resistant paper thereto.
Preferably, the densification step simultaneously forms a densified compression layer on the profile in connection with the wear-resistant reinforcing layer.
Preferably, the hot plate presses the profile while contacting the wear-resistant paper and continues compression feeding until a set compression amount is reached.
Preferably, the compression feeding of the hot plate is completed within 120s, and the set compression amount of 18% -23% is achieved.
Preferably, the pressure and temperature of the hot plate are maintained for 50s to 90s from the time when the set compression amount is reached, and then the temperature of the hot plate is reduced to 40 ℃ or lower in 8min to 10 min.
Preferably, the water content of the profile is 10% -14% before the densification treatment step is implemented; in the densification treatment step, the pressure of the hot plate is 3.5MPa to 4.5MPa.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. according to the section bar of the technical scheme, the part of the molten adhesive penetrating from the wear-resistant particle layer to the wear-resistant reinforcing layer is filled in the wear-resistant reinforcing layer, so that on one hand, the densification and compression effects of the section bar are enhanced by the penetrated adhesive, the formed wear-resistant reinforcing layer has higher density, strength, hardness and wear resistance, and the obtained modified section bar achieves the effects of paint free and veneer free; on the other hand, the bonding strength of the wear-resistant particle layer and the wear-resistant reinforcing layer is higher, the wear-resistant particle layer is not easy to fall off, the wear resistance of the profile is better, the wear-resistant service life is longer, and the service life of the profile can be prolonged.
2. According to the technical scheme, the densification compression of the section bar and the bonding and compounding of the wear-resistant paper and the section bar are simultaneously realized in the densification treatment step, so that the preparation process is relatively simple, the production efficiency is higher, the quality is relatively stable, particularly the wear-resistant particles are uniformly distributed on the surface of the section bar, namely the wear resistance of the treated section bar is approximately equivalent everywhere.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural view of a surface-function-modified profile of example 1 of the present application.
Fig. 2 is a schematic structural view of a surface-function-modified profile of example 2 of the present application.
Fig. 3 is a schematic structural view of a surface-function-modified profile of example 3 of the present application.
FIG. 4 is a cross-sectional density profile of the surface modification of example 3 of the present application.
Fig. 5 is a schematic structural view of a surface-function-modified profile of example 4 of the present application.
In the figure: 100,100', profile, 200, wear-resistant paper, 110, wear-resistant particle layer, 120, wear-resistant reinforcing layer, 130, densified compression layer, 140, raw density layer, 150, densified compression backing layer.
Detailed Description
In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
Example 1
Referring to the surface function modified profile 100 shown in fig. 1, the profile sequentially comprises a wear-resistant particle layer 110 and a wear-resistant reinforcing layer 120 from top to bottom, and the wear-resistant particle layer 110 is in adhesive connection with the wear-resistant reinforcing layer 120; the wear-resistant reinforcing layer 120 is densified and compressed and filled with a portion of the molten adhesive that penetrates the wear-resistant particle layer 110.
By virtue of the above structure, compared with the densified profile in the prior art, the densification compression effect of the profile 100 of the present embodiment is enhanced by the partially melted adhesive penetrating from the wear-resistant particle layer 110, so that the formed wear-resistant reinforcing layer 120 has higher density, strength, hardness and wear-resistant performance, and therefore, the surface of the profile formed by the wear-resistant particle layer 110 and the wear-resistant reinforcing layer 120 can achieve the technical effects of no painting decoration and no facing and direct use. Meanwhile, compared with the surface function modified material obtained by the technical scheme of the prior art (the process method of compacting and compressing and then pasting the wear-resistant paper, the wear-resistant reinforcing layer 120 is filled with the melt adhesive which permeates from the wear-resistant particle layer 110, so that the bonding strength between the wear-resistant particle layer 110 and the wear-resistant reinforcing layer 120 is higher, the wear-resistant particle layer 110 is not easy to fall off, the wear-resistant performance of the profile 100 is better, the wear-resistant service life is longer, and the service life of the profile can be prolonged.
Specifically, the profile 100' of this example was a poplar veneer having a thickness of 1mm in the initial state, and had an initial moisture content of about 12%. FirstThe profile 100' is covered with a wear-resistant paper 200, the wear-resistant paper 200 being 38g/m 2 The abrasion resistant paper 200 is only coated on the surface of the profile 100 'without connection with the surface of the profile 100'. Then, the profile 100' covered with the abrasion resistant paper 200 is placed between the upper and lower press plates, and a densification process step is performed. In the densification treatment step, the upper pressing plate and the lower pressing plate are hot plates, the temperature is 150+/-3 ℃, the initial distance between the upper pressing plate and the lower pressing plate is 2mm, and the thickness gauge is 0.6mm. And then, immediately lowering the upper pressing plate after the section bar 100' covered with the wear-resistant paper 200 is put in place, pressing the section bar 100' while the upper pressing plate contacts the wear-resistant paper 200, and continuously compressing and feeding until the section bar 100' contacts a thickness gauge with the thickness of 0.6mm, so as to obtain the section bar 100 with the thickness of 0.6mm. Finally, the water content of the profile 100 was adjusted to about 10% in a constant temperature and humidity environment.
By means of the method, firstly, densification compression of the section bar 100 'and bonding and compounding of the wear-resistant paper 200 and the section bar 100' are simultaneously achieved in the densification treatment step of the embodiment, so that the preparation process is relatively simple, the production efficiency is high, the treated section bar can be relatively stable, and particularly the wear-resistant particles are uniformly distributed on the surface of the section bar 100.
Secondly, the upper pressing plate melts the wear-resistant paper 200, at this time, the surface of the profile 100 'is not compressed yet, and the original material characteristic of the wear-resistant paper is still maintained, namely, the porosity is relatively large, so that part of adhesive in the wear-resistant paper 200, even wear-resistant particles, can permeate into the surface of the profile 100' under the action of the driving force of moisture migration caused by high temperature and pressure along with the compression feeding of the upper pressing plate. In other words, the temperature and pressure of the upper platen are transmitted to the profile 100' so that the yield strength of the material per unit thickness below the plate surface is smaller than the pressing pressure of the upper platen, and the unit thickness below the plate surface is simultaneously compacted and compressed and subjected to migration and penetration of part of the adhesive in the wear-resistant paper, even the wear-resistant particles. The unit thickness below the deck forms the wear resistant reinforcement layer 120 after simultaneous densification compression by hot pressing and migration penetration of the adhesive, and even the wear resistant particles. Therefore, compared with the densified compression surface layer obtained by the densification compression step alone, the abrasion-resistant enhancement layer 120 obtained by the modification process of the embodiment has higher density, strength, hardness and abrasion resistance due to the enhancement of the adhesive and even the abrasion-resistant particles, and can achieve the technical effects of no paint decoration and no facing for direct use; meanwhile, compared with the prior art (the process of compacting and then pasting the wear-resistant paper) the wear-resistant reinforcing layer 120 obtained by the modification process of the embodiment has better connection strength between the wear-resistant paper 200 and the profile 100', and the wear-resistant particles are not easy to fall off, so that the manufactured profile 100 has better wear resistance, longer wear-resistant service life and longer service life.
Example 2
The surface function modification method of the profile 100 is substantially the same as that of example 1, except that the profile 100' of this example is a poplar veneer with a thickness of 3mm in the initial state, a thickness gauge with a thickness of 2mm, and the profile 100 with a thickness of 2mm can be obtained after the densification process. Finally, the water content of the profile 100 was adjusted to about 10% in a constant temperature and humidity environment.
The compression feeding of the upper pressing plate is prolonged to continue, or preheating treatment is carried out for a period of time before compression, so that a densified compression layer 130 can be formed below the wear-resistant enhancement layer 120, and the wear-resistant enhancement layer 120 and the densified compression layer 130 are naturally connected with each other by the same material, namely, the two layers belong to two thickness layers which are subjected to different treatments on the original profile 100 and achieve different modification effects.
The profiles 100 of examples 1-2 were cold-pressed and adhered as a facing material to the surfaces of 14mm thick multi-layer plywood to give a thickness of 146mm and 16mm solid wood composite floor. The profile 100 for veneering has the advantage of being paint free and wear resistant over veneered veneers of the prior art. The physical and chemical properties of the obtained solid wood composite floor are shown in table 1. In Table 1, control group 1 is a solid wood composite floor board prepared by cold-pressing and laminating a poplar densified compressed veneer with a thickness of 3mm to 2mm on the surface of a multilayer plywood with a thickness of 14 mm; the control group 2 is a wear-resistant densified veneer manufactured by adopting the means of the prior art, namely, firstly compressing a poplar veneer with the thickness of 3mm to 2mm to obtain a densified compressed veneer, and then adhering wear-resistant paper on the surface of the densified compressed veneer by hot pressing to obtain the wear-resistant densified veneer, wherein the wear-resistant paper is 38g/m 2 And finally, cold pressing and pasting the wear-resistant densified veneer on the surface of the multi-layer plywood with the thickness of 14 mm.
Because no reference standard, particularly surface performance, for detecting the physical and chemical properties of the product exists at present, the performance indexes and the experimental methods selected by the application are implemented by referring to two standards of the artificial board and veneer artificial board physical and chemical property experimental method GB/T17657-2013 and the impregnated paper laminated wooden floor GB/T18102-2020.
TABLE 1 physicochemical Properties of the Profile-faced solid Wood composite floor of examples 1-2 of the present application
| Project | Surface hardness | Paint film adhesion | Hardness of paint film | Surface abrasion resistance | |
| Example 1 | 4250N | Level 1 | 9H | Not less than 12000r (commercial I level) | |
| Example 2 | 4700N | Level 1 | 9H | Not less than 12000r (commercial I level) | |
| Control group 1 | 3500N | / | / | | |
| Control group | |||||
| 2 | | Level | 2 | 9H | 9000r (commercial II level) |
Example 3
Referring to a surface function modified profile 100 shown in fig. 3, it comprises, in order from top to bottom, a wear resistant particle layer 110, a wear resistant reinforcing layer 120, a densified compression layer 130 and an original density layer 140. The wear-resistant particle layer 110 is adhesively connected with the wear-resistant reinforcing layer 120; the wear-resistant reinforcing layer 120 is compacted and filled with a portion of the molten adhesive that penetrates the wear-resistant particle layer 110; the densified compression layer 130 is connected to the wear-resistant reinforcing layer 120, and is a portion of the compressed thickness layer that is densified and compressed together with the wear-resistant reinforcing layer 120, where no adhesive penetrates; the raw density layer 140 is the raw thickness layer of the profile 100' that has not been densified. Of course, if the amount of compression is small enough, the structure of the profile 100 will consist of only the wear resistant particle layer 110, the wear resistant reinforcing layer 120 and the raw density layer 140. The control of the compression amount is any existing means available to those skilled in the art, and will not be described here.
The surface modification method of this embodiment obtains three kinds of profile materials 100 by respectively attaching three kinds of wear-resistant papers 200, the three kinds of wear-resistant papers 200 having a specification of 22g/m, respectively 2 (corresponding to the profile 100A), 38g/m 2 (corresponding to the obtained profile 100B), 45g/m 2 (corresponding to the profile 100C). The method specifically comprises the following steps:
firstly, placing wear-resistant paper 200 on the surface of a section bar 100', wherein the section bar 100' is a poplar plate with the thickness of 25mm, and the initial water content is about 14%; at the same time, the temperature of the upper platen was raised to 142.+ -. 2 ℃ and the temperature of the lower platen was kept at room temperature (about 25 ℃), and the profile 100' was placed on the lower platen together with the wear-resistant paper 200.
Then, the upper pressing plate is pressed down to start the densification treatment step, the upper pressing plate is pressed down to contact the wear-resistant paper and starts compression feeding, the pressure is 4MPa, the thickness of the thickness gauge is 20mm, namely the set compression amount is 20+/-1%; after 120s, the upper pressing plate contacts the thickness gauge and stops the compression feeding.
Thereafter, the pressure and temperature are maintained for 60 seconds, so that the densification process step simultaneously forms a densified compression layer 130 on the profile 100' that is coupled to the wear-resistant reinforcement layer 120.
And finally, the temperature of the upper pressing plate is reduced to about 40 ℃ within 10min, and the pressure is relieved and the material is discharged.
Fig. 4 shows a cross-sectional density diagram of three profiles 100 of the present embodiment, and compares the profile with the material, the profile compressed only with a single-side skin, in which the compression process of the profile compressed with a single-side skin is substantially the same as the present embodiment, except that there is a 20s preheating before compression. By the above method, the wear resistant particle layer 110 on the surface of the profile 100 forms a first density peak of the profile 100 and a second density peak at a distance below the wear resistant particle layer 110.
The prior art considers that since there is no premature migration of moisture caused by preheating and compression of the sheet occurs from the time when the hot plate (typically the upper platen) contacts the sheet, the thickness layer having a peak density in the densified compression profile obtained by the single-sided surface densification without preheating appears almost at the outermost surface of the sheet, gradually decreasing in the top-down direction to a certain thickness and below to maintain the original density of the profile 100'. However, the prior art lacquer finishing processes require a finely sanded surface obtained by sanding with a heavy duty sander, whereas the thickness layer with peak density is often completely sanded off during this process, so the prior art generally selects a preheated single-sided surface densification process to shift the thickness layer with peak density inward. Reference may be made to the profile density profile illustrated by the black curve in fig. 4.
In the present application, however, the inventors creatively found that the melting process of the wear-resistant paper located at the outermost surface requires a large amount of heat absorption, and the adhesive in the wear-resistant paper has a certain effect of blocking heat transfer, so that, although the embodiment adopts a single-side surface densification treatment process without preheating, the heat is firstly absorbed by the wear-resistant paper and forms a certain barrier at the initial stage of feeding of the upper platen (the feeding speed of the upper platen is actually very slow), and then gradually transferred to the forming 100', whereby the transfer path can constitute a substantial preheating effect, i.e., the thickness layer of the second density peak formed by the densification treatment of the hot press is actually located further inside the whole thickness section of the profile, and a slack zone of relatively lower density is formed between the first and second density peaks. Obviously, the density of the relaxed tape is relatively small and the porosity is relatively large compared to the second density peak, so the structure of the relaxed tape still allows migration and penetration of the adhesive, and possibly even the wear resistant particles.
In light of the above facts, the process of densification steps deduced by the inventors is as follows: the heat of the upper platen contacting the wear-resistant paper until the initial stage of feeding (for a period of about 5s to 6 s) is used for melting the wear-resistant paper and is blocked by the adhesive, at which time the wear-resistant paper is melted and resolidified to form a wear-resistant particle layer (first density peak). Then, compression densification gradually occurs, in the formed densified compressed thickness layer, the thickness layer connected with the wear-resistant particle layer is an opposite loose layer, part of adhesive is driven to permeate into the loose belt by high-temperature and pressure-induced moisture migration to form a wear-resistant reinforcing layer (inflection point density) with higher density than the original density of the loose belt, the rest thickness position in the thickness layer subjected to densification compression is defined as a densification compression layer, and then the second peak density appears in the densification compression layer.
Further, by combining a specific amount of compression (18% -23%) with the time consuming specific compression process (completed within 120 s), a dense layer can be formed in place sufficient to block continued penetration of the adhesive. In other words, the adhesive, possibly the wear resistant particles, are only able to migrate through within a specific thickness range. So that the adhesive and possible wear-resistant particles can be ensured to migrate and permeate to form a wear-resistant reinforcing layer; but also can avoid the adhesive from transitional permeation to influence the adhesion of wear-resistant particles on the surface of the profile. Further, the thickness layer of the second density peak value which is formed at the inner side position by the densification compression treatment can further enlarge the thickness of the reinforced surface layer of the profile, and the thickness layer is particularly characterized in that indexes such as ball drop impact resistance, bending strength and bending elastic modulus are improved. Conversely, if the compression amount is too large and the time for the compression process is too long, the adhesive is liable to excessively permeate to affect the adhesive force of the wear-resistant particles, and the profile density is in a density distribution form of a straight curve decreasing from the first peak density, and under the condition of no density 'sandwich state' distribution, the improvement effect of indexes such as ball drop impact resistance, bending strength, bending elastic modulus and the like of the profile is slightly lacking.
In this embodiment, the density of the original relaxed tape is also increased due to the penetration of the adhesive. It appears that in fig. 4 the inflection point density between the first density peak and the second density peak is increased. The thickness position defined from the surface to near the inflection point density is the wear resistant reinforcing layer 120, between the thickness position near the inflection point density to the thickness position where the original density occurs is the densified reinforcing layer 130, and below is the original density layer 140. The thickness of the adhesive-impregnated wear-resistant reinforcing layer 120 was experimentally measured to be about 0.5mm to 0.6mm, and the thickness of the densified reinforcing layer 130 was measured to be about 7mm to 8mm.
The physicochemical properties of the three profiles 100 of example 3 are shown with reference to table 2. Wherein, the control group 1 is a material; the control group 2 is a profile with only one side surface layer compression manufactured by adopting a preheating process; the control group 3 is a section bar prepared by adopting the means of the prior art, firstly compressing a poplar veneer with the thickness of 25mm to 20mm to obtain a compacted compressed section bar, and then adhering wear-resistant paper on the surface of the compacted compressed veneer by hot pressing to obtain a wear-resistant compacted veneer, wherein the wear-resistant paper is 38g/m 2 Is impregnated with aluminum oxide-melamine resin.
Table 2. Physical and chemical Properties Table of three Profile materials 100 of example 3
Example 4
Example 4 is different from example 3 in that, referring to fig. 5, a surface function modified profile 100 includes, from top to bottom, a wear resistant particle layer 110, a wear resistant reinforcing layer 120, a densified compression layer 130, an original density layer 140, and a densified compression back layer 150.
The profile 100 of this example was made by the following method:
firstly, the wear-resistant paper 200 is placed on the surface of a profile 100', wherein the profile 100' is a poplar plate with a thickness of 25mm, the initial water content is about 14%, and the wear-resistant paper 200 is 38g/m 2 Is impregnated with aluminum oxide-melamine resin; meanwhile, the temperature of the upper pressing plate and the lower pressing plate is increased to 142+/-2 ℃ so that the distance between the upper pressing plate and the lower pressing plate is controlled to be about 27 mm.
Subsequently, the profile 100' is placed on the lower platen together with the wear-resistant paper 200, with the upper platen rapidly contacting the wear-resistant paper 200.
Then, the upper pressing plate is pressed down to start the densification treatment step, the upper pressing plate is pressed down to contact the wear-resistant paper and starts compression feeding, the pressure is 4MPa, the thickness of the thickness gauge is 19mm, and the set compression amount is 24%; after 120s, the upper pressing plate contacts the thickness gauge and stops the compression feeding.
Thereafter, the pressure and temperature are maintained for 60 seconds, so that the densification process simultaneously forms the wear-resistant reinforcing layer 110, the densified compression layer 120 connected to the wear-resistant reinforcing layer 110, the densified compression layer 130, and the densified compression backing layer 150 on the profile 100'.
And finally, the temperature of the upper pressing plate is reduced to about 40 ℃ within 8min, and the pressure is relieved and the material is discharged.
Since both the upper and lower platens are hot plates, densification compression occurs on both faces of the profile 100'. Since the wear-resistant paper 200 is melted and resolidified to delay heat transfer, the densified compressed backing layer 150 is actually formed to a thickness slightly greater than the sum of the thicknesses of the wear-resistant reinforcing layer 120 and the densified compressed layer 130. And, the third density peak formed in the densified compression backing layer 150 occurs at a thickness position closer to the center line of the thickness than the second density peak occurs. Therefore, the relatively larger thickness of the compact layer and the position of the third density peak closer to the center line of the thickness can relatively better balance the wear-resistant particle layer 110, the wear-resistant reinforcing layer 120 and the compact compression layer 130 on the back surface of the profile 100, so that the flatness of the profile 100 is higher and easier to maintain.
The physicochemical properties of the profile 100 of example 4 are shown in table 3. Here, the medium 100B of example 3 and the control groups 1 to 3 were used as a comparison.
TABLE 3 physicochemical Properties of Profile 100 of example 4
| Project | Surface hardness | Flexural Strength | Flexural modulus of elasticity | Anti-drop ball impact | Length warp |
| Example 4 | 4500N | 117MPa | 9.9GPa | 0.70cm | 0.7％ |
| Section bar 100B | 4650N | 105MPa | 9.3GPa | 0.75cm | 0.4％ |
| Control group 1 | 1800N | 83MPa | 7.8GPa | 1.2cm | 0.3 |
| Control group | |||||
| 2 | 3700N | 91MPa | 8.2GPa | 0.84cm | 1.2％ |
| Control group 3 | 4350N | 90MPa | 8.5GPa | 0.81cm | 1.5％ |
As can be seen from table 3, the presence of the densified compression backing layer 150 can improve the flexural strength, flexural modulus of elasticity of the profile 100 to a certain extent, making it more stable in its flatness.
The foregoing description is for purposes of illustration and is not intended to be limiting. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the applicant be deemed to have such subject matter not considered to be part of the subject matter of the disclosed application.
Claims (7)
1. The surface function modified profile is characterized by sequentially comprising a wear-resistant particle layer and a wear-resistant reinforcing layer from top to bottom, wherein the wear-resistant particle layer is in bonding connection with the wear-resistant reinforcing layer; the wear-resistant reinforcing layer is subjected to densification and compression and is filled with a molten adhesive penetrating from the wear-resistant particle layer; the profile also comprises a densification compression layer which is positioned on the inner side of the wear-resistant reinforcing layer and connected with the wear-resistant reinforcing layer; the wear-resistant reinforcing layer and the densification compression layer belong to two thickness layers which are subjected to different treatments on an original profile and achieve different modification effects, and the original profile is poplar;
and in the densification step, the compression feeding of the hot plate is completed within 120 seconds, and the compression amount is set to 18% -23%.
2. The surface-modified profile of claim 1, wherein the profile further comprises a raw density layer; the original density layer is positioned on the inner side of the wear-resistant reinforcing layer and is connected with the wear-resistant reinforcing layer, or the original density layer is positioned on the inner side of the densification compression layer and is connected with the densification compression layer.
3. The surface-modified profile according to claim 1, characterized in that the wear resistant particle layer and the wear resistant reinforcing layer are located on the same side plate surface of the profile.
4. The surface function modification method of the section bar comprises a densification treatment step of hot-pressing the section bar through a hot plate, and is characterized in that wear-resistant paper is covered on the surface of the section bar, and then the densification treatment step is carried out on the section bar to form a wear-resistant particle layer and a wear-resistant reinforcing layer on the section bar; the wear-resistant particle layer is formed by melting and resolidifying the wear-resistant paper and is in bonding connection with the wear-resistant reinforcing layer; the wear-resistant reinforcing layer is subjected to densification and compression and is filled with a molten adhesive penetrating from the wear-resistant paper to the wear-resistant reinforcing layer; the densification treatment step simultaneously forms a densification compression layer connected with the wear-resistant reinforcing layer on the section bar; the compression feeding of the hot plate is completed within 120s, and the compression amount is set to 18% -23%; the wear-resistant enhancement layer and the densification compression layer belong to two thickness layers which are subjected to different treatments on an original profile and achieve different modification effects, and the original profile is poplar.
5. The profile surface function modifying method according to claim 4, wherein the hot plate presses the profile while contacting the abrasion-resistant paper and continues compression feeding until a set compression amount is reached.
6. The method for modifying a surface function of a profile according to claim 4 or 5, wherein the pressure and temperature of the hot plate are maintained for 50s to 90s from the time when the set compression amount is reached, and then the temperature of the hot plate is lowered to 40 ℃ or lower in a period of 8min to 10 min.
7. The method for modifying a surface function of a profile according to claim 4, wherein the moisture content of the profile is 10% to 14% before the densification step is performed; in the densification treatment step, the pressure of the hot plate is 3.5MPa to 4.5MPa.
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| CN102758518B (en) * | 2012-07-11 | 2015-03-11 | 宜兴狮王木业有限公司 | High-wear-resistant wood-plastic composite floor and preparation method thereof |
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