CN116277319A - Electric heating bamboo-wood composite shaving board, electric heating floor based on same and preparation method of electric heating floor - Google Patents
Electric heating bamboo-wood composite shaving board, electric heating floor based on same and preparation method of electric heating floor Download PDFInfo
- Publication number
- CN116277319A CN116277319A CN202310175035.8A CN202310175035A CN116277319A CN 116277319 A CN116277319 A CN 116277319A CN 202310175035 A CN202310175035 A CN 202310175035A CN 116277319 A CN116277319 A CN 116277319A
- Authority
- CN
- China
- Prior art keywords
- bamboo
- electric heating
- shavings
- layer
- wood
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical group C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 15
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 6
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 6
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 claims description 6
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 244000302661 Phyllostachys pubescens Species 0.000 claims description 5
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- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 claims description 5
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- 235000003891 ferrous sulphate Nutrition 0.000 claims description 4
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 4
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- 229910052799 carbon Inorganic materials 0.000 description 5
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- 238000006555 catalytic reaction Methods 0.000 description 2
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- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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- UHHAYTZGQHSBAD-UHFFFAOYSA-N tert-butyl(ethenyl)silane Chemical compound C(=C)[SiH2]C(C)(C)C UHHAYTZGQHSBAD-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The invention discloses an electric heating bamboo-wood composite shaving board, an electric heating floor based on the same and a preparation method of the electric heating floor. The electric heating bamboo-wood composite shaving board is a multi-layer bamboo-wood structure shaving board with an electric heating function, and the boards are of a central symmetrical structure; the electric heating bamboo-wood composite shaving board comprises an upper surface layer, an upper reinforcing layer, an electric heating layer, a lower reinforcing layer and a lower surface layer, wherein the upper surface layer and the lower surface layer are wood shavings, the upper reinforcing layer and the lower reinforcing layer are large thin shavings, the electric heating layer is modified bamboo shavings, the modified bamboo shavings are obtained by immersing the bamboo shavings in sodium hydroxide, and then carbonizing the bamboo shavings. The electric heating bamboo-wood composite shaving board prepared by the invention has the advantages of enhanced bonding strength, good insulating property and higher safety; the size of the plate is the same as that of a conventional floor, and the plate is convenient to lay; and the heating uniformity of the plate is ensured by electrifying at multiple points.
Description
Technical Field
The invention relates to the technical field of artificial boards, in particular to an electric heating bamboo-wood composite shaving board, an electric heating floor based on the same and a preparation method of the electric heating floor.
Background
The electric floor heating has the advantages of environmental protection, high energy utilization rate, small occupied space, uniform heat radiation and the like, has gradually become one of the development trends in the heating field, and along with the improvement of the requirements on the life quality, the electric floor heating has low price, excellent performance and safe use, and the electric floor heating base material is gradually required by people. At present, two fiber boards are used as base materials of the common electric heating artificial board in the market, carbon fiber paper or electric heating paper is used in the middle of the common electric heating artificial board for secondary pressing and pasting, and an electric heating wire is installed on the back of the base board.
Most of the existing electric heating floors use two layers of base plates to sandwich electric heating paper, so that the upper surface paper and the lower surface paper are required to be hot pressed at least four times, the process is complex, the energy consumption is more, and the mechanical property of the plate is reduced. The fiber board has overlarge density when used as a floor base material, high transportation cost and relatively weak moisture resistance.
Disclosure of Invention
Aiming at the problems that the structure of the existing electric heating floor is complex, secondary pressing is needed, the original base material is mainly a fiber board, the density is overlarge, the transportation cost is high, and the waterproof performance is poor, the invention provides an electric heating bamboo-wood composite shaving board, an electric heating floor based on the electric heating bamboo-wood composite shaving board and a preparation method of the electric heating floor.
The invention provides an electric heating bamboo-wood composite shaving board which is a multi-layer bamboo-wood structure shaving board with an electric heating function, wherein the boards are of a central symmetry structure; the electric heating bamboo-wood composite shaving board comprises an upper surface layer, an upper reinforcing layer, an electric heating layer, a lower reinforcing layer and a lower surface layer, wherein the mass ratio of each layer of components is 1-2:3-5:2-4:3-5:1-2 in sequence;
the raw material components of the upper surface layer and the lower surface layer are the same wood shavings, the length of the shavings is 10 mm-20 mm, the width of the shavings is 3 mm-5 mm, and the thickness of the shavings is 0.3 mm-0.7 mm; the upper surface layer and the lower surface layer are formed by non-directional pavement after the wood shavings are glued;
the upper and lower reinforcing layers are composed of the same large thin wood shavings, the length of the wood shavings is 30-50 mm, the width of the wood shavings is 10-20 mm, and the thickness of the wood shavings is 0.3-0.7 mm; the upper and lower reinforcing layers are formed by non-directional paving after the large thin shavings are glued;
the electrothermal layer comprises modified bamboo shavings with the length of 80-100 mm, the width of 30-50 mm and the thickness of 0.1-0.5 mm, and the shavings are shaped like rectangular sheets;
the preparation method of the modified bamboo shavings used for the electric heating layer comprises the following steps:
(1) Soaking bamboo shavings in 0.01-0.04mol/L sodium hydroxide for 30-45 min, cleaning, and oven drying;
(2) Immersing dried bamboo shavings in the mixed modifying liquid for 30-40 min under negative pressure, and then drying at 120 ℃ for 120-180 min;
(3) Placing the bamboo shavings subjected to the modification treatment in the step (2) in a tube furnace, carbonizing under the protection of nitrogen, preheating for 30min at 100-120 ℃, then heating to 1100-1300 ℃ at the speed of 20-25 ℃/min, carbonizing for 60-80 min, cooling, and taking out to obtain the modified bamboo shavings;
the mixed modification liquid is formed by blending nickel sulfate, ferrous sulfate, copper sulfate and deionized water, and the mass of the mixed modification liquid is 7-9 times of the mass of the bamboo shavings immersed in the step (2); the mass parts of the components in the mixed modified liquid are as follows:
the electric heating layer consists of three layers, wherein the mass ratio of the three layers is 1:3-6:1, adjacent layers are vertically arranged according to the fiber direction, the shavings of the same layer are directionally arranged according to the fiber direction, the direction of flaking fibers deviates from the transverse vertical line by less than 10 degrees, middle layer shavings are overlapped at one half to one third of adjacent shavings of the same layer, and upper layer shavings and lower layer shavings are overlapped at one third to one fifth of adjacent shavings of the same layer.
The design density of the electrothermal bamboo-wood composite shaving board is 750-800kg/m 3 The thickness is 20mm-25mm.
The water content of each layer of wood shavings of the electric heating bamboo-wood composite shaving board is not higher than 15%.
The wood shavings adopted by the upper surface layer and the lower surface layer are prepared from wood for common artificial boards such as poplar, pine, eucalyptus and the like through peeling, slicing, screening and drying.
The modified bamboo shavings in the electrothermal layer component are prepared by slicing moso bamboos, and the taken moso bamboos are all parts of the middle section of the bamboo without joints.
The adhesive adopted by the upper surface layer and the lower surface layer is PMDI adhesive, and the sizing amount of the upper surface layer and the lower surface layer is respectively 4-5% of the absolute dry mass of the wood shavings.
The adhesive adopted by the upper and lower reinforcing layers is a mixture of PMDI and epoxy acrylate resin, the sizing amount of the PMDI adhesive in the upper and lower reinforcing layers is 5.5-6.5% of the absolute dry mass of the wood shavings, and the sizing amount of the epoxy acrylate resin is 1-2% of the absolute dry mass of the wood shavings.
The electric heating layer adopts the mixture of modified hydroxy acrylic resin and PMDI, the sizing amount of the PMDI adhesive is 0.5-1.5% of the absolute dry mass of the wood shavings, and the sizing amount of the modified hydroxy acrylic resin is 6-8% of the absolute dry mass of the wood shavings;
the modified hydroxy acrylic resin is prepared by uniformly blending hydroxy acrylic resin emulsion, graphite powder and a silane coupling agent, and the mass parts of the components are as follows:
6-8 parts of hydroxy acrylic resin emulsion,
2-3 parts of graphite powder,
0.5-0.7 part of silane coupling agent.
The silane coupling agent is selected from any one or more of vinyl tert-butyl triperoxide silane, methacryloxy silane and butadienyl triethoxy silane.
The invention also provides a preparation method of the electric heating bamboo-wood composite shaving board, which comprises the following steps: and (3) paving and sizing each layer of the electric heating bamboo-wood composite shaving board, and then hot-pressing by using a hot press at a hot-pressing temperature of 150 ℃ and a unit pressure of 5-6 MPa for 800-1000 s to obtain the electric heating bamboo-wood composite shaving board.
The invention also provides an electric heating floor based on the electric heating bamboo-wood composite shaving board, which is manufactured by taking the electric heating bamboo-wood composite shaving board or a veneer which is subjected to veneer facing by taking the electric heating bamboo-wood composite shaving board as a base material for mechanical processing and circuit linking.
The specific preparation method of the electric heating floor based on the electric heating bamboo-wood composite shaving board comprises the following steps:
(1) Processing a substrate into rectangular strips with the length of 165mm and 1220mm, carrying out conventional grooving treatment on the side surface of the substrate, respectively forming two rectangular grooves I with the size of 20mm and 10mm and 5mm at the positions, which are away from one fourth of the long sides, on two short sides, wherein the rectangular grooves I are positioned in the central layer of the electric heating layer, and then respectively forming two rectangular grooves II with the size of 30mm and 5mm at the positions, which are away from one sixth of the two long sides, and the two grooves are respectively positioned in the upper layer and the lower layer of the electric heating layer;
(2) Punching holes in each rectangular groove, wherein the hole size is 60mm in depth and 6mm in diameter, driving cylindrical copper electrodes with the length of 65mm and the diameter of 6mm into the holes, connecting long-side electrodes with electrodes at the same position, and connecting circuits or with long sides of adjacent plates, and connecting short-side electrodes with circuits or with short sides of the adjacent plates to finally obtain the electric heating floor based on the electric heating bamboo-wood composite shaving board.
The carbon atoms in the bamboo fiber form a honeycomb crystal structure under the catalysis of high temperature and nickel ions, each carbon atom is connected with other three carbon atoms through sigma bonds, each carbon atom contributes a free electron to form a pi conjugated network system, the free electrons can move freely in a graphite type carbon atom network, and meanwhile, as cellulose in the bamboo fiber is strictly longitudinally arranged, graphite crystals formed by high-temperature carbonization are longitudinally arranged, and therefore, electrons can move freely in an electric heating layer of an electric heating shaving board which is strictly arranged.
Because the adhesive has poor conductivity, the graphite and the silane coupling agent are added into the adhesive of the electric heating layer, so that the continuity of current can be effectively improved. When the electric heating layer is connected with a power supply through electrodes at two ends, a conductive loop is formed inside the plate, after the electric heating layer is electrified and loaded, the bamboo fiber graphite wires in the conductive network and carriers at the lap joint interface of the bamboo fiber graphite wires in the conductive network move violently, collide and rub with each other, and finally electric energy is lost in a form of releasing heat.
In the enhancement layer, epoxy acrylic resin is added, so that the insulation performance of the plate is greatly improved while the bonding strength is enhanced, and the safety of the plate is improved.
Compared with the prior art, the invention has the following beneficial effects:
(1) The electric heating bamboo-wood composite shaving board prepared by the invention has the advantages of enhanced bonding strength, good insulating property and higher safety;
(2) The size of the plate is the same as that of a conventional floor, and the plate is convenient to lay; and the heating uniformity of the plate is ensured by electrifying at multiple points;
(3) The floor prepared from the electrothermal bamboo-wood composite shaving board has high strength and better performance.
Drawings
Fig. 1 is a top view of an electric heating floor based on an electric heating bamboo-wood composite shaving board.
Fig. 2 is a side view of the long side of the electric heating floor based on the electric heating bamboo-wood composite shaving board.
Fig. 3 is a short side view of the electric heating floor based on the electric heating bamboo-wood composite shaving board.
Fig. 4 is a schematic diagram of the current after the electric heating floor circuit based on the electric heating bamboo-wood composite shaving board is connected.
Each labeled in fig. 1-4: the novel composite shaving board comprises a 1-1 composite shaving board upper surface layer, a 1-2 composite shaving board lower surface layer, a 2-1 composite shaving board upper reinforcing layer, a 2-2 composite shaving board lower reinforcing layer, a 3-1 composite shaving board electric heating layer upper layer, a 3-2 composite shaving board electric heating layer middle layer, a 3-3 composite shaving board electric heating layer lower layer, a 4 rectangular groove I and a 5 rectangular groove II.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail. This invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided to explain the principles of the invention and its practical application so that others skilled in the art will be able to understand the invention for various embodiments and with various modifications as are suited to the particular use contemplated.
Example 1:
an electrothermal bamboo-wood composite shaving board with design density of 750kg/m 3 The plate is of a central symmetrical structure; the electric heating layer comprises an upper surface layer, an upper reinforcing layer, an electric heating layer, a lower reinforcing layer and a lower surface layer, wherein the mass ratio of each layer of components is 1:5:3:5:1;
peeling pine, slicing, screening and drying to prepare flaky wood shavings with the length of 10-20 mm, the width of 3-5 mm and the thickness of 0.3-0.7 mm as raw materials of upper and lower surface layers and large thin wood shavings with the length of 30-50 mm, the width of 10-20 mm and the thickness of 0.3-0.7 mm as raw materials of upper and lower reinforcing layers; cutting, screening and drying the sections of the middle section of the moso bamboo without sections to obtain the raw material bamboo shavings with the length of 80-100 mm, the width of 30-50 mm and the thickness of 0.1-0.5 mm, wherein the raw material bamboo shavings is similar to rectangular shavings with the electrothermal layer composition modified bamboo shavings.
The preparation method of the modified bamboo shavings comprises the following steps: soaking bamboo shavings in 0.03mol/L sodium hydroxide for 40min, cleaning, and oven drying; mixing 2 parts by weight of nickel sulfate, 25 parts by weight of ferrous sulfate, 15 parts by weight of copper sulfate and 80 parts by weight of deionized water which are 8 times the mass of dried bamboo shavings into a mixed modified liquid, carrying out negative pressure impregnation for 30min, and then drying at 120 ℃ for 150min; and then placing the dried bamboo shavings in a tube furnace, carbonizing under the protection of nitrogen, preheating at 120 ℃ for 30min, heating to 1200 ℃ at the speed of 25 ℃/min, carbonizing for 70min, cooling, and taking out to obtain the modified bamboo shavings.
The upper and lower skin layers used PMDI as an adhesive applied in an amount of 4% of the mass of the strands.
The upper and lower reinforcement layers used PMDI in an applied amount of 5.5% of the mass of the shavings and 2% of the mass of the epoxy acrylate resin as adhesives.
The electrothermal layer uses 8% of wood shavings mass of modified hydroxy acrylic resin which is formed by uniformly blending hydroxy acrylic resin emulsion with the mass ratio of 76%, 19% of graphite powder and 4.7% of butadiene-based triethoxysilane, and PMDI with the mass ratio of 1.0% of wood shavings mass as an adhesive.
The upper surface layer and the lower surface layer are formed by non-directional pavement after the wood shavings are glued.
The upper and lower reinforcing layers are formed by non-directional paving after the large thin shavings are glued.
The electric heating layer consists of three layers, the mass ratio of the three layers is 1:4:1, adjacent layers are vertically arranged according to the fiber direction, the shavings on the same layer are directionally arranged according to the fiber direction, the direction of flaking fibers deviates from the transverse vertical line by less than 10 degrees, the shavings on the middle layer are overlapped at one half to one third of the shavings on the adjacent layers, and the shavings on the two sides are overlapped at one third to one fifth of the shavings on the adjacent layers.
The chipboard is hot-pressed by a hot press after being paved, the hot pressing temperature is 150 ℃, the unit pressure is 6MPa, and the total hot pressing time is 800s, thus obtaining the product with the density of 750kg/m 3 And the thickness of the electric heating bamboo-wood composite shaving board is 20 mm.
Example 2:
in the description of embodiment 2, the same points as those of embodiment 1 are not described here again, and only the differences from embodiment 1 are described. Example 2 differs from example 1 in that: the thickness of the obtained electrothermal bamboo wood composite shaving board is 25mm, the total hot pressing time is 1000s, the rest materials are added in proportion, and the rest materials are described in the reference example 1, namely the obtained density is 750kg/m 3 And the thickness of the electric heating bamboo-wood composite shaving board is 25mm.
Example 3:
in the description of embodiment 3, the same points as those of embodiment 1 are not described here again, and only the differences from embodiment 1 are described. Example 3 differs from example 1 in that: the wood used for the upper surface layer, the lower surface layer, the upper reinforcing layer and the lower reinforcing layer of the shaving board is made of miscellaneous tree formed by mixing poplar and eucalyptus, the proportion of the upper surface layer, the upper reinforcing layer, the electric heating layer, the lower reinforcing layer and the lower surface layer is 1.5:3:3:3:1.5, the PMDI sizing amount of the reinforcing layer is PMDI6.5%, and epoxy hydroxyl is addedThe amount of acrylic resin was 1.5%, the amount of the top layer adhesive was 5%, and the rest was as described in reference example 1, namely, the density of 750kg/m was obtained 3 And the thickness of the electric heating bamboo-wood composite shaving board is 20 mm.
Example 4:
in the description of embodiment 4, the same points as those of embodiment 1 are not described here again, and only the differences from embodiment 1 are described. Example 4 differs from example 1 in that: the mass ratio of the three layers of the electrothermal layer is 1:6:1, the modified hydroxy acrylic resin adhesive consists of 72 percent of hydroxy acrylic resin, 20.6 percent of graphite and 7.4 percent of vinyl tertiary butyl silane triperoxide, and the rest of the components are described in the reference example 1, namely the prepared density is 750kg/m 3 And the thickness of the electric heating bamboo-wood composite shaving board is 20 mm.
Example 5:
in the description of embodiment 5, the same points as those of embodiment 1 are not described here again, and only the differences from embodiment 1 are described. Example 5 differs from example 1 in that: the mixed impregnating solution is prepared by blending 3 parts by weight of nickel sulfate, 20 parts by weight of ferrous sulfate, 12.5 parts by weight of copper sulfate and 70 parts by weight of deionized water, the mass of the mixed impregnating solution is 7 times that of impregnated bamboo shavings, the electrothermal process of the bamboo shavings is that the bamboo shavings are preheated for 30min at 100 ℃, then heated to 1100 ℃ at the speed of 20 ℃/min, carbonized for 80min, cooled and taken out, and the rest is as described in reference example 1, namely the prepared bamboo shavings with the density of 750kg/m 3 And the thickness of the electric heating bamboo-wood composite shaving board is 20 mm.
Example 6:
in the description of embodiment 6, the same points as those of embodiment 1 are not described here again, and only the differences from embodiment 1 are described. Example 6 differs from example 1 in that: the density of the obtained particle board is 800kg/m 3 The material was used in increasing proportion and the remainder was as described in reference example 1, i.e.the density obtained was 800kg/m 3 And the thickness of the electric heating bamboo-wood composite shaving board is 20 mm.
Comparative example 1:
in the description of comparative example 1, the same points as those of example 1 are not described here again, and only the differences from example 1 are described. Comparative example 1 differs from example 1 in that: the bamboo shavings were not carbonized and the rest were as described in reference example 1, i.e. a density of 750kg/m was obtained 3 And the thickness of the composite shaving board is 20 mm.
Comparative example 2:
in the description of comparative example 2, the same points as those of example 1 are not described here again, and only the differences from example 1 are described. Comparative example 2 differs from example 1 in that: the bamboo shavings were not treated with sodium hydroxide and the rest were as described in reference example 1, i.e. a density of 750kg/m was obtained 3 And the thickness of the composite shaving board is 20 mm.
Comparative example 3:
in the description of comparative example 3, the same points as those of example 1 are not described here again, and only the differences from example 1 are described. Comparative example 3 differs from example 1 in that: the bamboo flakes were not modified prior to carbonization and the remainder were as described in reference example 1, i.e. a density of 750kg/m 3 And the thickness of the composite shaving board is 20 mm.
Comparative example 4:
in the description of comparative example 4, the same points as those of example 1 are not described here again, and only the differences from example 1 are described. Comparative example 4 differs from example 1 in that: the same treatment was carried out without using bamboo shavings but with pine shavings of the same size for the electrothermal layer, as described in the remaining reference example 1, i.e. a density of 750kg/m was obtained 3 And the thickness of the composite shaving board is 20 mm.
Comparative example 5:
in the description of comparative example 5, the same points as those of example 1 are not described here again, and only the differences from example 1 are described. Comparative example 5 differs from example 1 in that: the reinforcing layer was not added with epoxy hydroxyacrylic resin, but replaced with PMDI of equal mass, i.e. a density of 750kg/m was produced 3 And the thickness of the composite shaving board is 20 mm.
Comparative example 6:
in the description of comparative example 6, the same points as those of example 1 are not described here again, and only the differences from example 1 are described. Comparative example 6 differs from example 1 in that: the ratio of upper skin layer, upper reinforcing layer, electrothermal layer, lower reinforcing layer and lower skin layer was 3:2:6:2:3, while the rest was described in reference example 1, i.e. the density obtained was 750kg/m 3 And the thickness of the composite shaving board is 20 mm.
Comparative example 7:
in the description of comparative example 7, the same points as those of example 1 are not described here again, and only the differences from example 1 are described. Comparative example 7 differs from example 1 in that: the impregnating solution was not added with nickel sulfate but instead with equal mass of copper sulfate, and the remainder was as described in reference example 1, i.e. a density of 750kg/m was obtained 3 And the thickness of the composite shaving board is 20 mm.
Comparative example 8:
in the description of comparative example 8, the same points as those of example 1 are not described here again, and only the differences from example 1 are described. Comparative example 8 differs from example 1 in that: in the adhesive used in the electrothermal layer, no graphite was added, and the rest was as described in reference example 1, namely, the resultant density was 750kg/m 3 And the thickness of the composite shaving board is 20 mm. .
Comparative example 9
The density of the P3 type requirement in GB/T4897-2015 particle board is 750kg/m 3 A particle board for floor base material with a thickness of 20 mm.
Comparative example 10
The floor for 20mm heating is purchased in the market and meets the requirements of LY/T3192-2020 electric heating wooden floor with built-in electric heating layer.
The above examples and comparative examples 1 to 10 were processed into floors according to the specifications, and the relevant tests were carried out as shown in tables 1 and 2. The experimental data are as follows, wherein the standard value 1 is LY/T3192-2020 electric heating wooden floor with built-in electric heating layer, the standard value 2 is the requirement of 20mm-25mm thick P4 type shaving board in GB/T4897-2015 shaving board, and for reference, the test environment temperature is 5 ℃, and the voltage is that the 220V household voltage is transformed into 36V and then the power is supplied for connection:
table 1 electrothermal property test of each example and comparative example sheet
Table 2 mechanical property test of each example and comparative example sheet
From the data in tables 1 and 2, it can be found that:
comparative example 1 was free from carbonization treatment, and was free from graphitized bamboo fibers, and the wood itself was an insulator, so that the temperature was hardly raised.
Comparative example 2 was not subjected to sodium hydroxide treatment, and the wax on the cell surface of the bamboo shavings resulted in insufficient interfacial bonding between the wood and the adhesive, affecting the internal bonding strength, and resulting in a decrease in the internal bonding strength of the panel.
The comparative example 3 was not modified and impregnated before carbonization, and the graphitization ratio of the electrothermal layer bamboo shavings was relatively low, and electrons were difficult to smoothly flow freely inside the plate, so that the power density, the heating efficiency and the surface temperature were all smaller than those of each example.
Comparative example 4 since pine wood shavings fibers were not aligned exactly like bamboo shavings fibers, current flow was not as smooth as with pure bamboo shavings, and thus power density, heating efficiency, and surface temperature were all smaller than those of each example.
Comparative example 5 was free from the addition of epoxy acrylic resin, and the insulation properties of the sheet material were lowered, resulting in an increase in leakage current in the operating state and a decrease in insulation resistance.
The proportion of the electric heating layer in the comparative example 6 is higher, and the lignin and the hemicellulose in the cell wall are greatly reduced along with the relative conversation after the wood carbonization, so that the cell strength of the bamboo wood is weakened, and when the proportion of the electric heating layer is higher, the internal bonding strength, the static bending strength and the elastic modulus of the board are correspondingly reduced along with the electric heating layer.
The impregnating solution in comparative example 7 was not added with nickel sulfate, but was changed to equal-mass copper sulfate, and since the bamboo fiber formed a honeycomb graphite crystal structure under the catalysis of nickel ions, and the copper ions did not have such a catalytic effect, the carbon formed was mostly amorphous carbon or transitional carbon, which resulted in difficulty in smooth flow of electrons inside the sheet, and therefore, the power density, the heating efficiency, and the surface temperature were all smaller than those of each example.
The adhesive of comparative example 8 was free of graphite powder, and electrons could not freely transition between the shavings and the chips due to the insulation of the adhesive itself, resulting in less power density, temperature increase efficiency and surface temperature than the examples.
Comparative example 9 is a conventional floor particle board, without electric heating property.
Comparative example 10 is a floor for floor heating purchased in the market, which has a slower heating time than each example, and also has a lower insulation resistance than each example, and at the same time, has relatively poor water resistance due to the use of the fiberboard as a base material.
Claims (10)
1. An electric heating bamboo-wood composite shaving board is characterized in that: the multi-layer bamboo-wood structure shaving board with the electric heating function is characterized in that the board is of a central symmetry structure; the electric heating bamboo-wood composite shaving board comprises an upper surface layer, an upper reinforcing layer, an electric heating layer, a lower reinforcing layer and a lower surface layer, wherein the mass ratio of each layer of components is 1-2:3-5:2-4:3-5:1-2 in sequence;
the raw material components of the upper surface layer and the lower surface layer are the same wood shavings, the length of the shavings is 10 mm-20 mm, the width of the shavings is 3 mm-5 mm, and the thickness of the shavings is 0.3 mm-0.7 mm; the upper surface layer and the lower surface layer are formed by non-directional pavement after the wood shavings are glued;
the upper and lower reinforcing layers are composed of the same large thin wood shavings, the length of the wood shavings is 30-50 mm, the width of the wood shavings is 10-20 mm, and the thickness of the wood shavings is 0.3-0.7 mm; the upper and lower reinforcing layers are formed by non-directional paving after the large thin shavings are glued;
the electrothermal layer comprises modified bamboo shavings with the length of 80-100 mm, the width of 30-50 mm and the thickness of 0.1-0.5 mm, and the shavings are shaped like rectangular sheets;
the preparation method of the modified bamboo shavings used for the electric heating layer comprises the following steps:
(1) Soaking bamboo shavings in 0.01-0.04mol/L sodium hydroxide for 30-45 min, cleaning, and oven drying;
(2) Immersing dried bamboo shavings in the mixed modifying liquid for 30-40 min under negative pressure, and then drying at 120 ℃ for 120-180 min;
(3) Placing the bamboo shavings subjected to the modification treatment in the step (2) in a tube furnace, carbonizing under the protection of nitrogen, preheating for 30min at 100-120 ℃, then heating to 1100-1300 ℃ at the speed of 20-25 ℃/min, carbonizing for 60-80 min, cooling, and taking out to obtain the modified bamboo shavings;
the mixed modification liquid is formed by blending nickel sulfate, ferrous sulfate, copper sulfate and deionized water, and the mass of the mixed modification liquid is 7-9 times of the mass of the bamboo shavings immersed in the step (2).
2. The electric heating bamboo-wood composite shaving board according to claim 1, wherein in the preparation method of the modified bamboo shavings used for the electric heating layer, the mass parts of the components in the mixed modified liquid are as follows:
3. an electrothermal bamboo wood composite shaving board according to claim 1 or 2, wherein the electrothermal layer is composed of three layers, the mass ratio of the three layers is 1:3-6:1, adjacent layers are vertically arranged according to the fiber direction, the same-layer shavings are directionally arranged according to the fiber direction, the flaking fiber direction deviates from the transverse and longitudinal vertical lines by less than 10 degrees, the middle layer shavings are overlapped at one half to one third of the adjacent shavings of the same layer, and the upper layer shavings and the lower layer shavings are overlapped at one third to one fifth of the adjacent shavings of the same layer.
4. An electrically heated bamboo-wood composite particle board according to claim 3, wherein said electrically heated bamboo-wood composite particle board has a design density of 750-800kg/m 3 The thickness is 20mm-25mm.
5. The electrothermal bamboo wood composite shaving board according to claim 4, wherein the adhesive adopted by the upper surface layer and the lower surface layer is PMDI adhesive, and the adhesive amount of the upper surface layer and the lower surface layer is 4-5% of absolute dry mass of the shaving layer respectively;
the upper and lower reinforcing layers are made of mixture of PMDI and epoxy acrylate resin, the PMDI adhesive sizing amount in the upper and lower reinforcing layers is 5.5-6.5% of the absolute dry mass of the wood shavings, and the epoxy acrylate resin sizing amount is 1-2% of the absolute dry mass of the wood shavings;
the adhesive adopted by the electrothermal layer is a mixture of modified hydroxy acrylic resin and PMDI, the sizing amount of the PMDI adhesive is 0.5-1.5% of the absolute dry mass of the wood shavings of the layer, and the sizing amount of the modified hydroxy acrylic resin is 6-8% of the absolute dry mass of the wood shavings of the layer;
the modified hydroxy acrylic resin is prepared by uniformly blending hydroxy acrylic resin emulsion, graphite powder and a silane coupling agent, and the mass parts of the components are as follows:
6-8 parts of hydroxy acrylic resin emulsion,
2-3 parts of graphite powder,
0.5-0.7 part of silane coupling agent;
the silane coupling agent is selected from any one or more of vinyl tert-butyl triperoxide silane, methacryloxy silane and butadienyl triethoxy silane.
6. The electric heating bamboo-wood composite shaving board according to claim 5, wherein wood shavings adopted by the upper surface layer and the lower surface layer are prepared from common wood poplar, pine and eucalyptus by peeling, slicing, screening and drying;
the modified bamboo shavings in the electric heating layer component are prepared by cutting moso bamboo, and the taken moso bamboo is a part of the middle section of the bamboo without joints.
7. The electrically heated bamboo-wood composite particle board of claim 6, wherein each layer of wood shavings of said electrically heated bamboo-wood composite particle board has a moisture content of no more than 15%.
8. A method for producing an electrically heated bamboo-wood composite particle board as claimed in any one of claims 1 to 7, comprising: and (3) paving and sizing each layer of the electric heating bamboo-wood composite shaving board, and then hot-pressing by using a hot press at a hot-pressing temperature of 150 ℃ and a unit pressure of 5-6 MPa for 800-1000 s.
9. An electric heating floor based on the electric heating bamboo-wood composite shaving board according to any one of claims 1 to 7, which is characterized in that the electric heating floor is manufactured by taking the electric heating bamboo-wood composite shaving board or a veneer which is formed by facing the electric heating bamboo-wood composite shaving board as a base material, and carrying out mechanical processing and circuit linking.
10. The method for preparing the electric heating floor based on the electric heating bamboo-wood composite shaving board as claimed in claim 9, which is characterized by comprising the following steps:
(1) Processing a substrate into rectangular strips with the length of 165mm and 1220mm, carrying out conventional grooving treatment on the side surface of the substrate, respectively forming two rectangular grooves I with the size of 20mm and 10mm and 5mm at the positions, which are away from one fourth of the long sides, on two short sides, wherein the rectangular grooves I are positioned in the central layer of the electric heating layer, and then respectively forming two rectangular grooves II with the size of 30mm and 5mm at the positions, which are away from one sixth of the two long sides, and the two grooves are respectively positioned in the upper layer and the lower layer of the electric heating layer;
(2) Punching holes in each rectangular groove, wherein the hole size is 60mm in depth and 6mm in diameter, driving cylindrical copper electrodes with the length of 65mm and the diameter of 6mm into the holes, connecting long-side electrodes with electrodes at the same position, and connecting circuits or with long sides of adjacent plates, and connecting short-side electrodes with circuits or with short sides of the adjacent plates to finally obtain the electric heating floor based on the electric heating bamboo-wood composite shaving board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310175035.8A CN116277319A (en) | 2023-02-16 | 2023-02-16 | Electric heating bamboo-wood composite shaving board, electric heating floor based on same and preparation method of electric heating floor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310175035.8A CN116277319A (en) | 2023-02-16 | 2023-02-16 | Electric heating bamboo-wood composite shaving board, electric heating floor based on same and preparation method of electric heating floor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116277319A true CN116277319A (en) | 2023-06-23 |
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ID=86786289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310175035.8A Pending CN116277319A (en) | 2023-02-16 | 2023-02-16 | Electric heating bamboo-wood composite shaving board, electric heating floor based on same and preparation method of electric heating floor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116277319A (en) |
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2023
- 2023-02-16 CN CN202310175035.8A patent/CN116277319A/en active Pending
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