CN116787560A - Composite heavy bamboo board and preparation method thereof - Google Patents
Composite heavy bamboo board and preparation method thereof Download PDFInfo
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- CN116787560A CN116787560A CN202310748613.2A CN202310748613A CN116787560A CN 116787560 A CN116787560 A CN 116787560A CN 202310748613 A CN202310748613 A CN 202310748613A CN 116787560 A CN116787560 A CN 116787560A
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- bamboo board
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- 235000017166 Bambusa arundinacea Nutrition 0.000 title claims abstract description 113
- 235000017491 Bambusa tulda Nutrition 0.000 title claims abstract description 112
- 241001330002 Bambuseae Species 0.000 title claims abstract description 112
- 235000015334 Phyllostachys viridis Nutrition 0.000 title claims abstract description 112
- 239000011425 bamboo Substances 0.000 title claims abstract description 112
- 239000002131 composite material Substances 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 114
- 239000000853 adhesive Substances 0.000 claims abstract description 69
- 230000001070 adhesive effect Effects 0.000 claims abstract description 69
- 238000007731 hot pressing Methods 0.000 claims abstract description 23
- 238000004513 sizing Methods 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 92
- 239000002245 particle Substances 0.000 claims description 56
- 239000000314 lubricant Substances 0.000 claims description 50
- 239000012792 core layer Substances 0.000 claims description 47
- 239000002344 surface layer Substances 0.000 claims description 47
- 239000004014 plasticizer Substances 0.000 claims description 31
- 238000012216 screening Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 21
- 239000002023 wood Substances 0.000 claims description 19
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 16
- 235000010413 sodium alginate Nutrition 0.000 claims description 16
- 239000000661 sodium alginate Substances 0.000 claims description 16
- 229940005550 sodium alginate Drugs 0.000 claims description 16
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 15
- 239000008158 vegetable oil Substances 0.000 claims description 15
- 239000003292 glue Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 235000019871 vegetable fat Nutrition 0.000 claims description 10
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 9
- 229920002472 Starch Polymers 0.000 claims description 9
- 239000000839 emulsion Substances 0.000 claims description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 9
- 239000008107 starch Substances 0.000 claims description 9
- 235000019698 starch Nutrition 0.000 claims description 9
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 9
- 229920002554 vinyl polymer Polymers 0.000 claims description 9
- 229920001285 xanthan gum Polymers 0.000 claims description 9
- 235000010493 xanthan gum Nutrition 0.000 claims description 9
- 239000000230 xanthan gum Substances 0.000 claims description 9
- 229940082509 xanthan gum Drugs 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000011229 interlayer Substances 0.000 claims description 6
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 4
- 229910052740 iodine Inorganic materials 0.000 claims description 4
- 239000011630 iodine Substances 0.000 claims description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract description 28
- 239000000203 mixture Substances 0.000 abstract description 14
- 239000002994 raw material Substances 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 5
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- 238000013329 compounding Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 25
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- 238000012360 testing method Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 6
- 239000002243 precursor Substances 0.000 description 5
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical compound C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 235000019198 oils Nutrition 0.000 description 4
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- 235000013311 vegetables Nutrition 0.000 description 3
- 108010082495 Dietary Plant Proteins Proteins 0.000 description 2
- 239000006087 Silane Coupling Agent Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000012824 chemical production Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
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- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 1
- 244000271437 Bambusa arundinacea Species 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 235000019482 Palm oil Nutrition 0.000 description 1
- 235000019483 Peanut oil Nutrition 0.000 description 1
- 244000302661 Phyllostachys pubescens Species 0.000 description 1
- 235000003570 Phyllostachys pubescens Nutrition 0.000 description 1
- 108010064851 Plant Proteins Proteins 0.000 description 1
- 108010073771 Soybean Proteins Proteins 0.000 description 1
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- -1 dioctyl ester Chemical class 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 230000008595 infiltration Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000004006 olive oil Substances 0.000 description 1
- 235000008390 olive oil Nutrition 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002540 palm oil Substances 0.000 description 1
- 239000000312 peanut oil Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 235000021118 plant-derived protein Nutrition 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 235000019710 soybean protein Nutrition 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- 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
- B27D1/06—Manufacture of central layers; Form of central layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/30—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being formed of particles, e.g. chips, granules, powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J105/00—Adhesives based on polysaccharides or on their derivatives, not provided for in groups C09J101/00 or C09J103/00
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J129/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
- C09J129/02—Homopolymers or copolymers of unsaturated alcohols
- C09J129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J131/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Adhesives based on derivatives of such polymers
- C09J131/02—Homopolymers or copolymers of esters of monocarboxylic acids
- C09J131/04—Homopolymers or copolymers of vinyl acetate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/06—Vegetal particles
- B32B2264/062—Cellulose particles, e.g. cotton
- B32B2264/065—Lignocellulosic particles, e.g. jute, sisal, hemp, flax, bamboo
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
Abstract
The application discloses a composite heavy bamboo board and a preparation method thereof, and relates to the technical field of material preparation. The preparation method of the composite heavy bamboo board comprises the steps of pretreating raw materials by using a treating agent with specific composition, then sizing by using an aldehyde-free adhesive with the same special compounding, and meanwhile, the product after hot pressing has excellent mechanical properties and effectively solves the defect of large performance difference of different batches of products prepared by the traditional production process; in addition, the formaldehyde emission of the product is extremely low, and the environmental protection is high.
Description
Technical Field
The application relates to the technical field of material preparation, in particular to a composite heavy bamboo board and a preparation method thereof.
Background
In the existing decoration processing field, the bamboo boards, especially the composite bamboo boards, have gradually replaced the traditional wood shaving boards or plastic composite boards to become hot for board application due to the characteristics of wide sources of production raw materials, excellent mechanical properties and moisture resistance of products and the like.
Compared with the original bamboo board, the composite bamboo board generally builds a surface-core-surface layer sandwich structure, so that the structural stability is higher, and the composite heavy bamboo board generally needs to be subjected to hot pressing again after the large-size bamboo is destroyed in the preparation process, and has higher density and strength after the processing is finished, and excellent dampproof effect. However, because the wood shavings of the heavy bamboo boards are generally higher in paving density, the requirement on the bonding effect of the adaptive adhesive is higher, but most of the adhesives have the characteristic of higher formaldehyde release amount, and the environmental protection is low; in the prior art, partial low-formaldehyde adhesive or formaldehyde-free adhesive is expected to replace the currently used types, but the adhesive has poor bonding effect, and the prepared heavy bamboo board has insufficient strength. Meanwhile, the existing composite heavy bamboo board basically adopts a preparation route of a common composite bamboo board, but in the production process, due to the large size specification of raw materials, the accurate unification is difficult, structural differences can occur on a microcosmic level after hot pressing and lamination, further, different stress effects of products produced among different batches are caused, and compared with the common composite bamboo board, the composite heavy bamboo board has large performance difference amplitude, so that the standardized difficulty of quality monitoring, maintenance and repair of subsequent products is improved.
Disclosure of Invention
Based on the defects existing in the prior art, the application aims to provide a preparation method of a composite heavy bamboo board, which comprises the steps of firstly pretreating raw materials by using a treating agent with specific composition, then sizing by using an aldehyde-free adhesive with the same special compounding, and meanwhile, effectively solving the defect of large performance difference of different batches of products prepared by the traditional production process, wherein the products after hot pressing have excellent mechanical properties; in addition, the formaldehyde emission of the product is extremely low, and the environmental protection is high.
The preparation method of the composite heavy bamboo board comprises the following steps:
(1) Cutting, slicing and drying bamboo wood to obtain bamboo shavings;
(2) Screening the bamboo shavings to obtain a core layer material and a surface layer material respectively;
(3) Adding lubricants into the core layer material and the surface layer material respectively, uniformly mixing and oscillating to obtain a lubricated core layer material and a lubricated surface layer material respectively; the lubricant comprises active carbon particles for adsorbing vegetable oil and fat, wherein the mass ratio of the active carbon particles to the vegetable oil and fat is (3.5:6.5) - (2.5:7.5); the mass ratio of the lubricant to the core layer material or the surface layer material is (0.05-0.1): 1, a step of;
(4) Respectively sizing the surface layer material and the core layer material by using an adhesive; the adhesive comprises a water-dispersible component and an adhesive component, wherein the mass ratio of the water-dispersible component to the adhesive component is (7:3) - (6:4); the water-dispersible component comprises sodium alginate; the adhesive component comprises MDI adhesive;
(5) Paving the glued core layer material between the glued surface layer material interlayers, and carrying out hot pressing and sawing treatment to obtain the composite heavy bamboo board.
Preferably, in the step (1), the bamboo shavings are pre-screened, the length of the screened bamboo shavings is 35-45 mm, the width is 15-25 mm, and the thickness is 0.5-0.8 mm.
Preferably, the screening process of the surface layer material and the core layer material in the step (2) is as follows: carrying out primary screening on the bamboo shavings to obtain a core layer material and a screened material; the mesh number of the screen mesh used for the primary screening is 1-2 meshes; carrying out secondary screening on the screened material, and obtaining surface layer material after screen residue; the mesh number of the screen mesh used for the secondary screening is 6-10 meshes.
Based on the requirement of using performance, the common composite heavy bamboo board has larger wood shaving size than the common composite bamboo board in the wood shaving raw material screening process, which also results in larger size and spreading direction between single sheets of heavy bamboo wood shavings in the same batch or different batches than the common bamboo wood shavings, even dispersion and uniformity are difficult to achieve during sizing and paving, after hot pressing, the wood shaving sheets have plane superposition or criss-cross condition, the performance of the product, especially the strength performance, has larger difference, although the related technology hopes to adopt oscillation or ultrasonic treatment in the sizing process to lead the wood shavings to be spread more uniformly before hot pressing, because the surface of the bamboo wood is not smooth after being subjected to wood shavings and drying, more raised/recessed and erected monofilament fibers exist, and even after external treatment, the bamboo wood shavings are still messy like forked hair. Therefore, in the technical scheme of the application, after the large-size bamboo shavings are screened, the inventor takes the specific activated carbon particles containing vegetable oil as the solid lubricant to carry out 'infiltration', because the activated carbon particles are small in size and are attached to the surfaces of the bamboo shavings or filled in defects after being mixed with the bamboo shavings, in the oscillating process, the activated carbon particles serve as pulleys when adjacent shavings sheets move and dynamically release the vegetable oil to carry out surface lubrication, so that the shavings sheets can be fully dispersed and spread, the laminating efficiency in hot pressing is higher, the dispersion is more regular, and finally the product performance difference between the same batch or different batches is small.
On the other hand, compared with the traditional formaldehyde-free adhesive, in order to match the lubricant components used for pretreatment, the inventor also adjusts the adhesive for sizing, changes the formula on the basis of the traditional CN108504320A formaldehyde-free adhesive developed by the inventor, and matches the high-content MDI adhesive with high viscosity and is very easy to be absorbed by activated carbon particles to adsorb sodium alginate for matching, so that the surface layer material and the core layer material after sizing have higher initial viscosity, and meanwhile, the adhesive strength is high, and the mechanical property of the product can be ensured not to be influenced under the state of using the lubricant. In addition, due to the specific composition of the adhesive and the cooperative adsorption of the activated carbon particles, the formaldehyde release amount in the product is extremely low, and the product completely accords with the concept of green finishing materials.
However, since the adhesive used in the present application contains both the water-dispersible component and the adhesive component, the lubrication treatment of the lubricant needs to be performed in advance, otherwise, it has been verified by the inventors that it is possible that the activated carbon particles are difficult to adhere to the surface of the shavings or to fill in the recesses to perform the lubrication action due to the polarity problem, and even to be released and accumulated on the surface of the product after hot pressing, thereby affecting the performance and appearance of the product.
Preferably, the mass ratio of the activated carbon particles to the vegetable fat in the lubricant is 3:7.
In the lubricant pretreatment stage, the composition of the lubricant also has a certain influence on the performance of the product: when the addition amount of the vegetable oil is too small, the pore structure of the activated carbon particles may not be sufficiently filled, and the lubrication effect is poor, but when the addition amount is too large, the vegetable oil may be separated from the activated carbon particles in the shaking process, released and dispersed on the partial shavings, and is also difficult to sufficiently lubricate, but on the contrary, the partial shavings sheets may be macroscopically bonded together and cannot be dispersed due to the effect of the vegetable oil, and the adsorption degree of the activated carbon particles to the vegetable oil is limited, and the vegetable oil is excessively introduced to have waste of raw materials, so that the lubrication effect of the lubricant is optimal when the mass ratio of the activated carbon particles to the vegetable oil is 3:7.
More preferably, the mesh number of the activated carbon particles is 180-220 mesh, and the iodine value is more than or equal to 900, and more preferably 900-1100.
The active carbon particles only act as early solid pulleys in the product of the application, and if the size is too large, a large number of bulges can be formed on the surface layer material and the core layer material after hot pressing; if the size is too small, agglomeration will occur during the oscillation process and the lubrication effect will be somewhat reduced. Therefore, under the condition of the same adsorption performance, the performance of the activated carbon particles with the size of 180-220 meshes is optimal.
More preferably, the preparation method of the activated carbon particles for adsorbing vegetable fat comprises the following steps: under the ultrasonic stirring treatment, the active carbon particles are added into the vegetable oil and fat to be uniformly mixed.
More preferably, the activated carbon particles are modified with a silane coupling agent prior to contact with the vegetable fat.
The active carbon particles can be directly purchased commercial materials, or can be products obtained by self-firing raw materials such as coconut shells, guide rods, bamboo chips and the like; in the process of adsorbing vegetable oil, the condition of uneven adsorption of activated carbon particles caused by agglomeration is only needed to be avoided, and the ultrasonic stirring treatment mode is preferably used for avoiding; in order to make the vegetable fat more efficiently handled by the activated carbon particle system, the activated carbon particles may be subjected to a modification treatment with a silane coupling agent such as hexamethyldisilazane, gamma-methacryloxypropyl trimethoxysilane, or the like.
Preferably, the mass ratio of the lubricant to the core layer material is (0.08-0.1): 1, a step of; the mass ratio of the lubricant to the surface layer material is (0.05-0.06): 1.
in the preparation method, the wood shavings in the core material have larger size, so that more lubricant is needed to be added in comparison with the surface material to achieve the optimal optimization effect in order to improve the overall distribution regularity of the core material.
Preferably, the vegetable oil is at least one of coconut oil, peanut oil, olive oil, soybean oil and palm oil.
Preferably, in the step (3), the oscillating treatment is performed on an oscillating device, the oscillating frequency is 5-10 hz, and the oscillating time is 5-10 min.
Because of the small size of the activated carbon particles, the frequency of oscillation should not be too high and the time should not be too long in order to allow the activated carbon particles to be in full contact with the flakes and not gather at the bottom due to gravity.
Preferably, the mass ratio of the MDI glue to the sodium alginate in the adhesive is (1.7-2.7): 1.
in order to avoid the phenomenon of escaping and gathering of the lubricant in the product, and ensure that the adhesive has excellent initial viscosity and bonding strength after sizing, the addition amount of the MDI adhesive and the sodium alginate in the adhesive needs to be maintained in a specific range.
More preferably, the water-dispersible component comprises the following components in parts by weight: 20-40 parts of polyvinyl alcohol, 20-40 parts of xanthan gum, 20-40 parts of vinyl acetate-acrylic emulsion, 1-10 parts of starch and 4-6 parts of sodium alginate; the adhesive component comprises a plasticizer and MDI adhesive, and the mass ratio of the plasticizer to the MDI adhesive is (9:1) - (8:2).
In the water-dispersible components, in order to ensure the action of the integral adhesive, the sodium alginate needs to take an adhesive resin matrix compounded by three components of polyvinyl alcohol, xanthan gum and vinyl acetate-acrylic emulsion as a carrier, so that the advantages of the sodium alginate serving as thickening soluble salt are fully exerted, the viscosity is quite high, and a stable adhesive system can be formed with the MDI adhesive to avoid escape of activated carbon particles.
Preferably, the adhesive can be prepared by a conventional preparation method, and can be prepared by a certain adjustment by referring to the method described in the prior patent CN108504320A of the inventor.
Preferably, the adhesive applied in the step (4) is used for sizing the surface layer material and the core layer material during sizingThe weight of the catalyst is 30-40 kg/m 3 。
Preferably, the mass ratio of the core layer material to the surface layer material in the paving in the step (5) is (1-2): 1.
preferably, the temperature in the hot pressing in the step (5) is 190-250 ℃, the speed is 10-20 mm/s, and the applied pressure is 3-6 bar.
Compared with the common composite bamboo board, the composite heavy bamboo board adopts the large-size wood shavings as the raw material and is matched with the adhesive with high-content MDI adhesive and sodium alginate, so that the prepared product can realize excellent bonding strength and mechanical strength only by needing higher hot pressing pressure and slower hot pressing rate.
The application further aims at providing the composite heavy bamboo board prepared by the preparation method of the composite heavy bamboo board.
The composite heavy bamboo board prepared by the preparation method of the application has excellent mechanical property, the elastic modulus can reach more than 7000MPa, meanwhile, the mechanical property deviation of products among batches is small, the production stability is strong, the quality monitoring and the standardized maintenance are easy in practical application, and meanwhile, the formaldehyde release amount of the products is low, and can reach E NF Grade formaldehyde emission rating.
The application has the beneficial effects that the application provides the preparation method of the composite heavy bamboo board, the preparation method comprises the steps of pretreating raw materials by using the treating agent with specific composition, then sizing by using the aldehyde-free adhesive with the same special compounding, and the product after hot pressing has excellent mechanical properties, and simultaneously effectively solves the defect of large performance difference of different batches of products prepared by the traditional production process; in addition, the formaldehyde emission of the product is extremely low, and the environmental protection is high.
Drawings
FIG. 1 is a schematic diagram of a core layer material after sizing in the process of the composite heavy bamboo board prepared in example 1 of the present application.
Fig. 2 is a schematic diagram of a surface layer material after sizing in the process of the composite heavy bamboo board prepared in example 1 of the present application.
FIG. 3 is a schematic cross-sectional view of a composite heavy bamboo board prepared in example 1 of the present application.
Detailed Description
The present application will be further described with reference to specific examples and comparative examples for better illustrating the objects, technical solutions and advantages of the present application, and the object of the present application is to be understood in detail, not to limit the present application. All other embodiments, which can be made by those skilled in the art without the inventive effort, are intended to be within the scope of the present application. The experimental reagents and instruments involved in the practice of the present application are common reagents and instruments unless otherwise specified.
In each of the examples and comparative examples,
the bamboo is the Shaoguan locally produced phyllostachys pubescens;
the polyvinyl alcohol is a 1999 brand product produced by Wanwei company;
the xanthan gum is a product of any hillock high-tech chemical production 9270;
the vinyl acetate-acrylic emulsion is a DC-7039 product produced by Fulankolin of Guangzhou;
the starch is food-grade starch for the new chemical production of Qinyang;
the plant protein is soybean protein produced by Jiangxi Hengding food Co., ltd;
the DOP plasticizer is a dioctyl ester product produced by Shandong Ying Chuan;
the DBP plasticizer is used for producing dibutyl ester products for Shandong Ying Chuan creations;
the MDI glue is a CW-20 product produced by Wanhua chemistry;
the gelatin is a product produced by Jinan Xiandajieduda;
the active carbon particles are coal products produced by Buddha Basan, 200 meshes and iodine value of 900-1100;
the activated carbon particles for adsorbing the coco oil are obtained by soaking hexamethyldisilazane in the coco oil, placing the dried activated carbon particles in the coco oil, carrying out ultrasonic stirring and mixing uniformly, and standing for 20min until the coco oil is completely adsorbed;
in addition, the raw materials used in the examples and comparative examples of the present application are all commonly-used commercial products, and the same kind was used for the parallel experiments in each example and comparative example.
Example 1
The preparation method of the composite heavy bamboo board and one embodiment of the preparation method of the composite heavy bamboo board comprises the following steps:
(1) Cutting, slicing and drying bamboo wood to obtain bamboo shavings; the bamboo shavings are screened, the length of the screened shavings is 35-45 mm, the width of the shavings is 15-25 mm, and the thickness of the shavings is 0.5-0.8 mm;
(2) Carrying out primary screening on the bamboo shavings to obtain a core layer material and a screened material; the mesh number of the screen mesh used for the primary screening is 1 mesh; carrying out secondary screening on the screened material, and obtaining surface layer material after screen residue; the mesh number of the screen mesh used for the secondary screening is 8 meshes;
(3) Adding lubricant into the core layer material and the surface layer material respectively, uniformly mixing, and carrying out oscillation treatment on the mixture on an oscillation shaking table at 8hz frequency for 10min to obtain lubricated core layer material and surface layer material respectively; the lubricant is activated carbon particles for adsorbing the coconut oil, and the mass ratio of the activated carbon particles to the coconut oil is 3:7; the mass ratio of the lubricant to the core material is 0.08:1, a step of; the mass ratio of the lubricant to the surface material is 0.05:1, a step of;
(4) Respectively sizing the surface layer material and the core layer material by using an adhesive;
(5) Paving the glued core layer material between the glued surface layer material interlayers, wherein the mass ratio of the core layer material to the surface layer material is 1.5:1, carrying out hot pressing and sawing treatment to obtain the composite heavy bamboo board; the temperature during hot pressing is 200 ℃, the speed is 15mm/s, and the applied pressure is 5bar.
The adhesive comprises a component a and a component b, wherein the mass ratio of the component a to the component b is 7:3; the component a comprises the following components in parts by weight: 30 parts of polyvinyl alcohol, 30 parts of xanthan gum, 30 parts of vinyl acetate-acrylic emulsion, 5 parts of starch and 5 parts of sodium alginate; the component b comprises a plasticizer and MDI glue, and the mass ratio of the plasticizer to the MDI glue is 8:2; the plasticizer is a mixture of DOP plasticizer and DBP plasticizer according to a mass ratio of 1:1.
The preparation method of the adhesive comprises the following steps: sequentially adding the component a into a proper amount of water according to the formula sequence to uniformly disperse the component a (the added solvent water is not added into the weight of the adhesive and the components), and then adjusting the pH value to be neutral or slightly alkaline to ensure that the whole mixed solution cannot be precipitated, thus obtaining a precursor I; and then uniformly mixing the component b according to the formula, heating and stirring the mixture under the nitrogen atmosphere until the mixture is not layered and stable to obtain a precursor II, and uniformly mixing the precursor I and the precursor II and sizing the precursor II in the sizing process.
Example 2
An embodiment of the composite heavy bamboo board and the preparation method thereof of the present application only differs from embodiment 1 in that the mass ratio of the activated carbon particles to the coconut oil in the step (3) is 3.5:6.5.
Example 3
An embodiment of the composite heavy bamboo board and the preparation method thereof of the present application only differs from embodiment 1 in that the mass ratio of the activated carbon particles to the coconut oil in the step (3) is 2.5:7.5.
Example 4
An embodiment of the composite heavy bamboo board and the preparation method thereof of the present application only differs from embodiment 1 in that the mass ratio of the lubricant to the core material in the step (3) is 0.05:1, a step of; the mass ratio of the lubricant to the surface material is 0.05:1.
example 5
An embodiment of the composite heavy bamboo board and the preparation method thereof of the present application only differs from embodiment 1 in that the mass ratio of the lubricant to the core material in the step (3) is 0.1:1, a step of; the mass ratio of the lubricant to the surface material is 0.1:1.
example 6
The composite heavy bamboo board and the preparation method thereof of the application are different from the embodiment 1 only in that the adhesive comprises a component a and a component b, and the mass ratio of the component a to the component b is 6:4.
Example 7
The composite heavy bamboo board and one embodiment of the preparation method of the application only differ from embodiment 1 in that the adhesive comprises a component a and a component b, and the mass ratio of the component a to the component b is 7:3; the component a comprises the following components in parts by weight: 30 parts of polyvinyl alcohol, 25 parts of xanthan gum, 30 parts of vinyl acetate-acrylic emulsion, 5 parts of starch and 10 parts of sodium alginate; the component b comprises a plasticizer and MDI glue, and the mass ratio of the plasticizer to the MDI glue is 8:2; the plasticizer is a mixture of DOP plasticizer and DBP plasticizer according to a mass ratio of 1:1.
Example 8
The composite heavy bamboo board and one embodiment of the preparation method of the application only differ from embodiment 1 in that the adhesive comprises a component a and a component b, and the mass ratio of the component a to the component b is 7:3; the component a comprises the following components in parts by weight: 30 parts of polyvinyl alcohol, 30 parts of xanthan gum, 30 parts of vinyl acetate-acrylic emulsion, 5 parts of starch and 5 parts of sodium alginate; the component b comprises a plasticizer and MDI glue, and the mass ratio of the plasticizer to the MDI glue is 7:3; the plasticizer is a mixture of DOP plasticizer and DBP plasticizer according to a mass ratio of 1:1.
Example 9
The composite heavy bamboo board and an embodiment of the preparation method thereof are different from the embodiment 1 only in that the activated carbon particles are replaced by Buddha's Basan to produce coal products with 325 meshes and iodine value of 900-1100.
Example 10
An embodiment of the composite heavy bamboo board and the preparation method thereof of the present application is different from embodiment 1 only in that the time of the oscillation treatment is 15min.
Comparative example 1
The preparation method of the composite heavy bamboo board comprises the following steps:
(1) Cutting, slicing and drying bamboo wood to obtain bamboo shavings; the bamboo shavings are screened, the length of the screened shavings is 35-45 mm, the width of the shavings is 15-25 mm, and the thickness of the shavings is 0.5-0.8 mm;
(2) Carrying out primary screening on the bamboo shavings to obtain a core layer material and a screened material; the mesh number of the screen mesh used for the primary screening is 1 mesh; carrying out secondary screening on the screened material, and obtaining surface layer material after screen residue; the mesh number of the screen mesh used for the secondary screening is 8 meshes;
(3) Respectively sizing the surface layer material and the core layer material by using an adhesive;
(4) Paving the glued core layer material between the glued surface layer material interlayers, wherein the mass ratio of the core layer material to the surface layer material is 1.5:1, carrying out hot pressing and sawing treatment to obtain the composite heavy bamboo board; the temperature during hot pressing is 200 ℃, the speed is 15mm/s, and the applied pressure is 5bar.
The adhesive comprises a component a and a component b, wherein the mass ratio of the component a to the component b is 8:2; the component a comprises the following components in parts by weight: 30 parts of polyvinyl alcohol, 30 parts of xanthan gum, 30 parts of vinyl acetate-acrylic emulsion, 5 parts of starch and 5 parts of vegetable protein; the component b comprises a plasticizer and MDI glue, and the mass ratio of the plasticizer to the MDI glue is 8:2; the plasticizer is a mixture of DOP plasticizer and DBP plasticizer according to a mass ratio of 1:1.
The adhesive was prepared in the same manner as in example 1.
Comparative example 2
The preparation method of the composite heavy bamboo board comprises the following steps:
(1) Cutting, slicing and drying bamboo wood to obtain bamboo shavings; the bamboo shavings are screened, the length of the screened shavings is 35-45 mm, the width of the shavings is 15-25 mm, and the thickness of the shavings is 0.5-0.8 mm;
(2) Carrying out primary screening on the bamboo shavings to obtain a core layer material and a screened material; the mesh number of the screen mesh used for the primary screening is 1 mesh; carrying out secondary screening on the screened material, and obtaining surface layer material after screen residue; the mesh number of the screen mesh used for the secondary screening is 8 meshes;
(3) Adding lubricant into the core layer material and the surface layer material respectively, uniformly mixing, and carrying out oscillation treatment on the mixture on an oscillation shaking table at 8hz frequency for 10min to obtain lubricated core layer material and surface layer material respectively; the lubricant is activated carbon particles for adsorbing the coconut oil, and the mass ratio of the activated carbon particles to the coconut oil is 3:7; the mass ratio of the lubricant to the core material is 0.08:1, a step of; the mass ratio of the lubricant to the surface material is 0.05:1, a step of;
(4) Respectively sizing the surface layer material and the core layer material by using an adhesive;
(5) Paving the glued core layer material between the glued surface layer material interlayers, wherein the mass ratio of the core layer material to the surface layer material is 1.5:1, carrying out hot pressing and sawing treatment to obtain the composite heavy bamboo board; the temperature during hot pressing is 200 ℃, the speed is 15mm/s, and the applied pressure is 5bar.
The adhesive comprises a component a and a component b, wherein the mass ratio of the component a to the component b is 8:2; the component a comprises the following components in parts by weight: 30 parts of polyvinyl alcohol, 30 parts of xanthan gum, 30 parts of vinyl acetate-acrylic emulsion, 5 parts of starch and 5 parts of vegetable protein; the component b comprises a plasticizer and MDI glue, and the mass ratio of the plasticizer to the MDI glue is 8:2; the plasticizer is a mixture of DOP plasticizer and DBP plasticizer according to a mass ratio of 1:1.
The adhesive was prepared in the same manner as in example 1.
Comparative example 3
The preparation method of the composite heavy bamboo board comprises the following steps:
(1) Cutting, slicing and drying bamboo wood to obtain bamboo shavings; the bamboo shavings are screened, the length of the screened shavings is 35-45 mm, the width of the shavings is 15-25 mm, and the thickness of the shavings is 0.5-0.8 mm;
(2) Carrying out primary screening on the bamboo shavings to obtain a core layer material and a screened material; the mesh number of the screen mesh used for the primary screening is 1 mesh; carrying out secondary screening on the screened material, and obtaining surface layer material after screen residue; the mesh number of the screen mesh used for the secondary screening is 8 meshes;
(3) Respectively sizing the surface layer material and the core layer material by using an adhesive;
(4) Paving the glued core layer material between the glued surface layer material interlayers, wherein the mass ratio of the core layer material to the surface layer material is 1.5:1, carrying out hot pressing and sawing treatment to obtain the composite heavy bamboo board; the temperature during hot pressing is 200 ℃, the speed is 15mm/s, and the applied pressure is 5bar.
Wherein the adhesive is the same as in example 1, simultaneously introducing lubricant during the sizing process, and oscillating for 10min at 8hz frequency on an oscillating shaker; the lubricant is activated carbon particles for adsorbing the coconut oil, and the mass ratio of the activated carbon particles to the coconut oil is 3:7; the mass ratio of the lubricant to the core material is 0.08:1, a step of; the mass ratio of the lubricant to the surface material is 0.05:1, a step of; .
Comparative example 4
The difference between the composite heavy bamboo board and the preparation method thereof and the embodiment 1 is that the mass ratio of the activated carbon particles to the coconut oil in the step (3) is 4:6.
Comparative example 5
The difference between the composite heavy bamboo board and the preparation method thereof and the embodiment 1 is that the mass ratio of the activated carbon particles to the coconut oil in the step (3) is 2:8.
Comparative example 6
The difference between the composite heavy bamboo board and the preparation method thereof and the embodiment 1 is that the mass ratio of the lubricant to the core material in the step (3) is 0.02:1, a step of; the mass ratio of the lubricant to the surface material is 0.02:1.
comparative example 7
The difference between the composite heavy bamboo board and the preparation method thereof and the embodiment 1 is that the mass ratio of the lubricant to the core material in the step (3) is 0.2:1, a step of; the mass ratio of the lubricant to the surface material is 0.2:1.
comparative example 8
The difference between the composite heavy bamboo board and the preparation method thereof is that the activated carbon particles are replaced by 200 mesh talcum powder produced in Shengfei China, and the method for adsorbing the coconut oil is the same as that of the embodiment 1.
Comparative example 9
A composite heavy bamboo board and a preparation method thereof, which differ from example 1 only in that the sodium alginate is replaced with gelatin.
Comparative example 10
The composite heavy bamboo board and the preparation method thereof are different from example 1 only in that the shaking treatment in the step (3) is replaced with a manual stirring treatment at a speed of about 5 rpm.
Effect example 1
To verify the performance of the composite heavy bamboo panels of the present application, the product of example 1 (cut into test panels of 500 x 18 mm) was subjected to performance testing:
the products of each example were subjected to constant temperature and humidity treatment at 20℃and 50% relative humidity for 24 hours, then allowed to stand at normal temperature and humidity for 24 hours, and subjected to performance tests according to GB/T4897-2015 particle Board, GB 18580-2017 artificial Board for interior decoration materials and the amount of formaldehyde released from its products, and the respective properties are listed in Table 1.
TABLE 1
As can be seen from Table 1, the composite heavy bamboo board prepared by the application has excellent mechanical properties, and each parameter index is far more than the qualification standard required by the test, wherein the elastic modulus is up to 7500MPa; simultaneously, the formaldehyde release amount of the product is extremely low, and completely accords with E NF The standard of the grade, as can be seen from fig. 1 and 2, the core layer and the surface layer are tightly connected after sizing, and meanwhile, as can be seen from the sectional view of fig. 3, the composite heavy bamboo board has almost no obvious surface-core layer difference after lamination.
Effect example 2
In order to verify the performance stability of the same batch of the composite heavy bamboo board in the preparation process, the products (1220×2440×18 mm) obtained in each example and comparative example are cut into 6 test templates (500×500×18 mm), the test of the elastic modulus of key indexes and the internal and external bonding strength is carried out according to the method of effect example 1, and the test results are shown in table 2 according to the statistical average value and variance of each numerical value, and the original data are not repeated here.
TABLE 2
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As can be seen from the table, the average value of the elastic modulus of the composite heavy bamboo board prepared by the preparation method can reach more than 7300MPa, the internal bonding strength can reach more than 0.95MPa, and the surface bonding strength can reach more than 1.05 MPa; the products have excellent performance stability in the same batch, the dispersion of key performance indexes tested by different parts is low, wherein the maximum value of the elastic modulus 6 groups of the products of the embodiment 1 is 7550MPa, the minimum value of the products is 7450MPa, the difference from the average value is only about 50MPa, the variance is only 892 after calculation, and the variance of the internal bonding strength and the surface bonding strength is also the minimum of the products of each embodiment. The product of the comparative example 1 is prepared by adopting a conventional heavy bamboo composite bamboo board preparation process, and the product is similar to the product of each example in statistical average value, but the maximum value of elastic modulus in 6 groups of tests is 7620MPa, the minimum value is 7400MPa, the difference between the product and the average value can reach more than 100MPa, the variance is calculated to be more than 6000, the performance difference of different parts is large, and the conditions of internal bonding and surface bonding strength are similar. Compared with comparative example 1, the product of comparative example 2 is characterized in that the lubricant is introduced in the preparation process, but the adhesive used for sizing is still an aldehyde-free adhesive used for conventional bamboo boards, the degree of performance difference of each part of the product is not high, and the expected level is not reached yet, so that the selection of the lubricant and the adhesive in the preparation method of the application is the key for improving the uniformity of the batch performance of the product. Meanwhile, according to the product performance of comparative example 3, the lubricant and the adhesive are applied at the same time, otherwise, the uniformity of the product performance cannot be improved, but the mechanical property and the uniformity of the product performance are greatly reduced due to the addition of the lubricant (the distribution range of the measured elastic modulus is 6950-7300 MPa, and the difference range is larger than that of the product of comparative example 1), and the appearance of the product is affected (irregular agglomerated activated carbon particles appear on the surface of the product). From the comparison of the products of examples 1 to 3 and comparative examples 4 and 5, although the amount of the vegetable resin adsorbed in the activated carbon particles does not greatly affect the mechanical properties and the bonding strength of the product, it is difficult to exert a good lubricating effect even if the amount of the vegetable resin adsorbed is too large or too small, and it is known from the comparison of the products of example 1, examples 4 to 5 and comparative examples 6 and 7 that the amount of the activated carbon particles added is too large or too small to improve the uniformity of the performance of the product when the amount of the vegetable resin adsorbed is not changed. From the performance of example 9 and comparative example 8, it is known that some fillers commonly used in the prior art are not suitable for the carrier particles of the lubricant according to the present application, and the prepared lubricant has an unsatisfactory lubrication effect when talc particles are used as the carrier, and even if activated carbon particles are used as the carrier particles, the particles may agglomerate during lubrication and the uniformity of the performance of the product may be not high if the particle size is too small. From the comparison of the performance of the products of example 1 and comparative example 9, it is clear that sodium alginate is a common water-soluble thickening/adhesive, but that other common thickening/adhesives may be substituted, and that adhesives formulated with gelatin do not work as intended in combination with lubricants. As is apparent from comparison of the product properties of example 10 and comparative example 10 with example 1, the lubricant hardly disperses uniformly and hardly plays a lubricating role if it is applied by manual stirring alone during addition, whereas the activated carbon particles may be separated from the flake sheet if the degree of the vibration treatment is too high, resulting in a lowered lubricating effect, and thus the condition at the time of vibration also has a certain influence on the use effect of the lubricant.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the scope of the present application, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present application.
Claims (10)
1. The preparation method of the composite heavy bamboo board is characterized by comprising the following steps of:
(1) Cutting, slicing and drying bamboo wood to obtain bamboo shavings;
(2) Screening the bamboo shavings to obtain a core layer material and a surface layer material respectively;
(3) Adding lubricants into the core layer material and the surface layer material respectively, uniformly mixing and oscillating to obtain a lubricated core layer material and a lubricated surface layer material respectively; the lubricant comprises active carbon particles for adsorbing vegetable oil and fat, wherein the mass ratio of the active carbon particles to the vegetable oil and fat is (3.5:6.5) - (2.5:7.5); the mass ratio of the lubricant to the core layer material or the surface layer material is (0.05-0.1): 1, a step of;
(4) Respectively sizing the surface layer material and the core layer material by using an adhesive; the adhesive comprises a water-dispersible component and an adhesive component, wherein the mass ratio of the water-dispersible component to the adhesive component is (7:3) - (6:4); the water-dispersible component comprises sodium alginate; the adhesive component comprises MDI adhesive;
(5) Paving the glued core layer material between the glued surface layer material interlayers, and carrying out hot pressing and sawing treatment to obtain the composite heavy bamboo board.
2. The method for producing heavy bamboo boards according to claim 1, wherein the bamboo shavings in step (1) are pre-screened, the length of the screened bamboo shavings is 35-45 mm, the width is 15-25 mm, and the thickness is 0.5-0.8 mm.
3. The method for preparing the composite heavy bamboo board according to claim 1, wherein the screening process of the surface layer material and the core layer material in the step (2) is as follows: carrying out primary screening on the bamboo shavings to obtain a core layer material and a screened material; the mesh number of the screen mesh used for the primary screening is 1-2 meshes; carrying out secondary screening on the screened material, and obtaining surface layer material after screen residue; the mesh number of the screen mesh used for the secondary screening is 6-10 meshes.
4. The method for producing a composite heavy bamboo board as claimed in claim 1, wherein the mass ratio of the activated carbon particles to the vegetable fat in the lubricant is 3:7.
5. The method for preparing the composite heavy bamboo board according to claim 1, wherein the mesh number of the activated carbon particles is 180-220 mesh, and the iodine value is more than or equal to 900, preferably 900-1100.
6. The method for preparing the composite heavy bamboo board according to claim 1, wherein the mass ratio of the lubricant to the core layer material is (0.08-0.1): 1, a step of; the mass ratio of the lubricant to the surface layer material is (0.05-0.06): 1.
7. the method for preparing the composite heavy bamboo board according to claim 1, wherein the mass ratio of the MDI glue to the sodium alginate in the adhesive is (1.7-2.7): 1.
8. the method for preparing the composite heavy bamboo board as claimed in claim 7, wherein the water-dispersible component comprises the following components in parts by weight: 20-40 parts of polyvinyl alcohol, 20-40 parts of xanthan gum, 20-40 parts of vinyl acetate-acrylic emulsion, 1-10 parts of starch and 4-6 parts of sodium alginate; the adhesive component comprises a plasticizer and MDI adhesive, and the mass ratio of the plasticizer to the MDI adhesive is (9:1) - (8:2).
9. The method of manufacturing a composite heavy bamboo board as claimed in claim 1, comprising at least one of the following (a) to (c):
(a) The sizing amount of the adhesive applied to the surface layer material and the core layer material in the step (4) is 30-40 kg/m 3 ；
(b) The mass ratio of the core layer material to the surface layer material in the paving in the step (5) is (1-2): 1, a step of;
(c) The temperature in the step (5) is 190-250 ℃, the speed is 10-20 mm/s, and the applied pressure is 3-6 bar.
10. The composite heavy bamboo board prepared by the method for preparing the composite heavy bamboo board according to any one of claims 1 to 9.
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