CN110744671B - Manufacturing method of light-colored outdoor recombined bamboo wood - Google Patents
Manufacturing method of light-colored outdoor recombined bamboo wood Download PDFInfo
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- CN110744671B CN110744671B CN201910753863.9A CN201910753863A CN110744671B CN 110744671 B CN110744671 B CN 110744671B CN 201910753863 A CN201910753863 A CN 201910753863A CN 110744671 B CN110744671 B CN 110744671B
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- 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
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/12—Moulding of mats from fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/002—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process employing compositions comprising microorganisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/0207—Pretreatment of wood before impregnation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/34—Organic impregnating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/34—Organic impregnating agents
- B27K3/50—Mixtures of different organic impregnating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/06—Softening or hardening of wood
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K9/00—Chemical or physical treatment of reed, straw, or similar material
- B27K9/002—Cane, bamboo
-
- 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
- B27N1/00—Pretreatment of moulding material
- B27N1/02—Mixing the material with binding agent
- B27N1/0209—Methods, e.g. characterised by the composition of the agent
-
- 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
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
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- 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
- C09J11/04—Non-macromolecular additives inorganic
-
- 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
- C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
- C09J161/04—Condensation polymers of aldehydes or ketones with phenols only
- C09J161/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2244—Oxides; Hydroxides of metals of zirconium
Abstract
The invention discloses a manufacturing method of light-colored outdoor recombined bamboo, which comprises the steps of softening, rolling and carding bamboo chips to prepare bamboo fiber bundles, dipping and gluing the bamboo fiber bundles in a modified phenolic resin adhesive, uniformly paving the glued bamboo fiber bundles to form a plate blank, sending the plate blank into a hot press for hot press molding, setting the bamboo chip softening liquid as softening liquid implemented in multiple steps, reducing the soaking and softening time of the conventional acid liquor or alkali liquor, and carrying out acylation reaction by the synergy of glacial acetic acid, dicyclohexylcarbodiimide and maleic anhydride, wherein on one hand, the bamboo chip softening liquid can rapidly decompose saccharides, starch and protein, reduce the damage on a cellulose microstructure and the breakage of molecular bonds of lignin, has mild reaction process, can not deepen the color of the fiber bundles, reduces the rinsing process, and improves the bonding performance of the bamboo fiber bundles and the phenolic resin by carrying out modification treatment on a phenolic resin adhesive, and the overall mechanical properties of the composite board are increased by adding the filler.
Description
Technical Field
The invention relates to the technical field of agricultural and sideline product manufacturing and application, in particular to a manufacturing method of light-colored outdoor recombined bamboo wood.
Background
China is a big bamboo resource country, and bamboos are applied to the field of composite boards, so that the utilization rate of the bamboos is improved on one hand, and the composite boards with excellent performance are provided on the other hand. The bamboo-wood fiber board is a high-tech green environment-friendly novel decorative material which is mainly prepared by taking wood cellulose and plant cellulose as basic materials, thermoplastic high polymer material plastic, processing aids and the like, uniformly mixing and then heating and extruding through die equipment for molding, has the performance and characteristics of wood and plastic, and is a novel composite material capable of replacing wood and plastic. The cold-resistant and heat-insulating floor not only has the characteristics of attractive appearance and elegant appearance, but also has good cold-resistant and heat-insulating properties, and is widely applied to home decoration.
The existing bamboo wood recombined plate has the defects that some composite plates formed by mutually bonding and injection molding bamboo powder and viscose lose the original wood form of bamboo, other recombined plates formed by extracting bamboo fiber bundles from bamboo chips, paving, gluing and bonding the bamboo fiber bundles, the internal structure of the bamboo fiber bundles can be damaged in the process of extracting bamboo fibers from the bamboo chips, so that the strength of the bamboo fiber bundles is integrally reduced, in addition, the bamboo fiber bundles are required to be softened in the process of extracting fibers from the bamboo chips, the color of the bamboo fibers can be greatly deepened in the softening process by the existing technology, the light-colored bamboo fiber bundles can be prepared by further rinsing, on one hand, the color generated in the softening process is removed by rinsing, the strength of the bamboo fibers can be further damaged, the working procedures are increased, the environment is further polluted, and the existing recombined plates have poor bonding capability with the bamboo fiber bundles and the viscose, a large amount of adhesive is required to cover the bamboo fiber bundles for gluing.
Disclosure of Invention
The invention aims to provide a manufacturing method of light-colored outdoor recombined bamboo wood, which ensures that a light-colored recombined bamboo board is prepared on the premise of ensuring the strength of the recombined bamboo board and reducing bleaching steps.
The technical purpose of the invention is realized by the following technical scheme: a manufacturing method of light-colored outdoor recombined bamboo wood comprises the following steps,
(1) unit preparation: bamboo chips are used as raw materials, and bamboo fiber bundles are prepared after softening, rolling and carding;
(2) drying and gumming: drying the bamboo fiber bundles, and then placing the dried bamboo fiber bundles into modified phenolic resin for dipping and sizing;
(3) assembling and hot pressing: uniformly paving the glued bamboo fiber bundles into a plate blank, and then sending the plate blank into a hot press for hot press molding;
(4) sawing: and (3) cutting edges and sanding the plate blank subjected to hot press molding, and then sending the plate blank into a constant-temperature constant-humidity room for health preservation to obtain the light-color outdoor recombined bamboo wood.
Wherein the softening in the step (1) comprises placing bamboo chips in softening liquid, softening to obtain softened bamboo chips, carding the bamboo chips treated by the solution in a rolling machine into bamboo bundles which are longitudinally continuous, transversely loose and connected in a staggered manner, beating by a hammer with a buffer effect, and washing to obtain bamboo fiber bundles,
the softening liquid comprises a first step softening liquid, a second step softening liquid and a third step softening liquid,
the first step softening liquid comprises glacial acetic acid, maleic anhydride and dicyclohexylcarbodiimide;
the softening liquid in the second step comprises one or a mixture of at least two of mucilaginous enzyme, hemicellulase and pectinase, and also comprises vitamin C;
the softening liquid in the third step comprises alkaline water and vegetable oil.
As a further improvement of the invention, after the bamboo fiber bundle is dried at 100-105 ℃ in the step (2) until the water content is 6-12 percent,
1) dipping the modified phenolic resin glue with 20 to 25 percent of solid content for 5 to 10min, and drying the glue at 80 ℃ until the water content is less than or equal to 16 percent;
2) thermoplastic powder phenolic resin is adopted, and glue is sprayed by a spray gun according to the addition amount of 10-20% of the glue application amount.
The invention is further improved, wherein in the step (3), after the bamboo fiber bundles are uniformly assembled, the hot pressing unit pressure is 0.4-0.8Mpa, the hot pressing temperature is 140-180 ℃, and the hot pressing time is 1-1.5min/mm according to the thickness of a finished product plate.
The invention is further improved, wherein in the step (4), the plate blank is cut and sanded and then sent into a constant-temperature and constant-humidity room for health preservation, and the equilibrium moisture content of the constant-temperature and constant-humidity room is set according to that the annual average equilibrium moisture content of the light-color outdoor recombined bamboo use region is 2% lower.
As a further improvement of the invention, in the step (1), the bamboo chips are firstly placed in glacial acetic acid for soaking, the first-stage acylation treatment is carried out after the soaking is carried out for 5 to 20min at the temperature of between 70 and 85 ℃, the glacial acetic acid solution is removed, the temperature is reduced to between 45 and 65 ℃, the mixture of maleic anhydride and dicyclohexylcarbodiimide is added for soaking for 5 to 20min, the second-stage acylation treatment is carried out, the bamboo chips subjected to the second-stage acylation treatment are placed in 0.5 to 0.7 percent of the softening liquid of the second step, 0.5 percent of vitamin C is simultaneously added for enzymolysis for 20min,
adding vegetable oil into alkaline water for emulsification, and soaking the bamboo chips subjected to enzymolysis treatment in the emulsified vegetable oil for 20-30 min.
As a further improvement of the invention, the modified phenolic resin adhesive is composed of the following raw materials in parts by weight:
2-5 parts of sweetgum resin
6-8 parts of nano rare earth oxide
100-200 parts of phenolic resin
3-5 parts of silane coupling agent
20-50 parts of a filler;
the above raw materials are stirred and reacted for 2-4 hours at 135-165 ℃.
As a further improvement of the invention, the nano rare earth oxide comprises one or a mixture of at least two of lanthanum oxide, neodymium oxide and zirconium oxide.
As a further improvement of the invention, the silane coupling agent comprises one or a mixture of at least two of 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane, 3- (2-aminoethylamine) propylmethyldimethoxysilane and gamma-aminoethylaminopropyltrimethoxysilane.
As a further improvement of the invention, the filler comprises, in a mass ratio of 2: 1 oyster powder and glass beads.
In conclusion, the invention has the following beneficial effects:
the bamboo chip softening liquid is improved and is set to be the softening liquid implemented in multiple steps, so that the soaking softening time of the traditional acid liquid or alkali liquid is reduced, the bamboo chips are acylated by glacial acetic acid, part of protein, hemicellulose and polysaccharide in the bamboo chips are rapidly degraded and softened, the residual glacial acetic acid is used as a catalyst, and after dicyclohexylcarbodiimide is added, the residual glacial acetic acid and maleic anhydride are subjected to an acylation reaction in a synergistic manner, so that on one hand, saccharides, starch and proteins can be rapidly decomposed, the damage to the microstructure of cellulose is reduced, the breakage of molecular bonds of lignin is reduced, and the adhesive property to phenolic resin is improved under the action of anhydride; carry out the secondary treatment through compound enzymatic hydrolysate, through the softening expansion of one-level softening treatment bamboo chip, make inside compound enzymatic hydrolysate can be quick enters into the bamboo chip, enzymolysis remaining partial saccharide, starch, protein, its process is mild, it is little to the intensity destruction of cellulose, and through adding vitamin C, play the effect of keeping the look, reduce the pigment deposit that the oxidation caused, add the plant at last and have and alkali lye, after the emulsification, carry out saponification to the bamboo chip, its reaction process is mild, the environmental protection, it is little to pollute.
Through the softening process of multistep setting to reduce the acylation softening treatment's under high temperature time, reduce the destruction degree to the cellulose, with decompose remaining saccharide, starch, protein through compound enzyme, its whole process is mild, can be quick when having guaranteed bamboo fiber bundle's intensity soften, and to a great extent has kept bamboo fiber's true qualities, has reduced the process of rinsing.
The phenolic resin adhesive is modified, the liquidambar formosana is added to the phenolic resin for chain extension reaction to form a block copolymer, a net structure can be generated through crosslinking, the adhesive force of the block copolymer is improved, the adhesive property of the bamboo fiber bundle and the phenolic resin is improved by adding the nano rare earth oxide, and the overall mechanical property of the combined board is improved by adding the filler.
Detailed Description
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
The first embodiment is as follows:
a manufacturing method of light-colored outdoor recombined bamboo wood comprises the following steps,
(1) unit preparation: taking 100 parts by mass of bamboo chips as raw materials, firstly soaking the bamboo chips in 0.4mol/L glacial acetic acid, soaking for 5min at 75 ℃, carrying out primary acylation treatment, removing glacial acetic acid solution, cooling to 50 ℃, adding into 5mol/L mixed solution of maleic anhydride and dicyclohexylcarbodiimide, soaking for 15min, carrying out secondary acylation treatment,
placing the above two-stage acylation processed bamboo chip into 0.7% of the softening solution of the second step, adding 0.5% of vitamin C, performing enzymolysis for 20min,
adding vegetable oil into alkaline water for emulsification, soaking the bamboo chips after enzymolysis treatment in the emulsified vegetable oil for 20min,
softening to obtain softened bamboo chips, putting the bamboo chips treated by the solution into a rolling machine, carding into bamboo bundles which are longitudinally continuous, transversely loose and connected in a staggered manner, beating by using a rubber hammer, and washing to obtain bamboo fiber bundles;
(2) drying and gumming: drying the bamboo fiber bundle at 105 ℃ until the water content is 10 percent,
1) soaking the modified phenolic resin with the solid content of 20% for 5min, and drying the phenolic resin at 80 ℃ until the water content is less than or equal to 16%;
the modified phenolic resin is prepared from the following raw materials in parts by weight:
5 parts of sweetgum resin
5 parts by weight of 1: 1: 1 mixture of lanthana, neodymia and zirconia
100 parts of phenolic resin
5 parts by weight of a mixture of 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane, 3- (2-aminoethylamine) propylmethyldimethoxysilane and gamma-aminoethylaminopropyltrimethoxysilane
30 parts by mass of 2: 1 oyster powder and glass beads;
the above raw materials were reacted at 135 ℃ for 2 hours with stirring.
2) Adopting modified phenolic resin powder, and spraying glue by using a spray gun according to the addition amount of 10% of the glue application amount;
(3) assembling and hot pressing: uniformly paving the glued bamboo fiber bundles into a plate blank, and then carrying out hot pressing at a unit pressure of 0.8Mpa and a temperature of 160 ℃ for 1min/mm according to the thickness of a finished plate;
(4) sawing: and (3) cutting edges of the plate blank, sanding, and then conveying the plate blank into a constant-temperature and constant-humidity room for health preservation, wherein the balanced water content of the constant-temperature and constant-humidity room is set according to the annual average balanced water content of the light-color outdoor recombined bamboo wood use region which is 2% lower.
Example two:
a manufacturing method of light-colored outdoor recombined bamboo wood comprises the following steps,
(1) unit preparation: taking 100 parts by mass of bamboo chips as raw materials, firstly soaking the bamboo chips in 0.4mol/L glacial acetic acid, soaking for 15min at 75 ℃, removing glacial acetic acid solution, cooling to 50 ℃, adding 5mol/L maleic anhydride and dicyclohexylcarbodiimide mixed solution, soaking for 20min, performing secondary acylation treatment,
placing the above two-stage acylation processed bamboo chip into 0.7% of the softening solution of the second step, adding 0.5% of vitamin C, performing enzymolysis for 20min,
adding vegetable oil into alkaline water for emulsification, soaking the bamboo chips after enzymolysis treatment in the emulsified vegetable oil for 20min,
softening to obtain softened bamboo chips, putting the bamboo chips treated by the solution into a rolling machine, carding into bamboo bundles which are longitudinally continuous, transversely loose and connected in a staggered manner, beating by using a rubber hammer, and washing to obtain bamboo fiber bundles;
(2) drying and gumming: drying the bamboo fiber bundle at 105 ℃ until the water content is 10 percent,
1) soaking the modified phenolic resin with the solid content of 20% for 5min, and drying the phenolic resin at 80 ℃ until the water content is less than or equal to 16%; the modified phenolic resin is prepared from the following raw materials in parts by weight:
5 parts of sweetgum resin
5 parts by weight of 1: 1: 1 mixture of lanthana, neodymia and zirconia
100 parts of phenolic resin
5 parts by weight of a mixture of 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane, 3- (2-aminoethylamine) propylmethyldimethoxysilane and gamma-aminoethylaminopropyltrimethoxysilane
30 parts by mass of 2: 1 oyster powder and glass beads;
the above raw materials were reacted at 135 ℃ for 2 hours with stirring.
2) Adopting modified phenolic resin powder, and spraying glue by using a spray gun according to the addition amount of 10% of the glue application amount;
(3) assembling and hot pressing: uniformly paving the glued bamboo fiber bundles into a plate blank, and then carrying out hot pressing at a unit pressure of 0.8Mpa and a temperature of 160 ℃ for 1min/mm according to the thickness of a finished plate;
(4) sawing: and (3) cutting edges of the plate blank, sanding, and then conveying the plate blank into a constant-temperature and constant-humidity room for health preservation, wherein the balanced water content of the constant-temperature and constant-humidity room is set according to the annual average balanced water content of the light-color outdoor recombined bamboo wood use region which is 2% lower.
Example three:
a manufacturing method of light-colored outdoor recombined bamboo wood comprises the following steps,
(1) unit preparation: taking 100 parts by mass of bamboo chips as raw materials, firstly soaking the bamboo chips in 0.4mol/L glacial acetic acid, soaking for 5min at 75 ℃, carrying out primary acylation treatment, removing glacial acetic acid solution, cooling to 50 ℃, adding into 5mol/L mixed solution of maleic anhydride and dicyclohexylcarbodiimide, soaking for 15min, carrying out secondary acylation treatment,
placing the above two-stage acylation processed bamboo chip into 0.7% of the softening solution of the second step, adding 0.5% of vitamin C, performing enzymolysis for 20min,
adding vegetable oil into alkaline water for emulsification, soaking the bamboo chips after enzymolysis treatment in the emulsified vegetable oil for 20min,
softening to obtain softened bamboo chips, putting the bamboo chips treated by the solution into a rolling machine, carding into bamboo bundles which are longitudinally continuous, transversely loose and connected in a staggered manner, beating by using a rubber hammer, and washing to obtain bamboo fiber bundles;
(2) drying and gumming: drying the bamboo fiber bundle at 105 ℃ until the water content is 10 percent,
1) soaking the modified phenolic resin with the solid content of 20% for 5min, and drying the phenolic resin at 80 ℃ until the water content is less than or equal to 16%; the modified phenolic resin is prepared from the following raw materials in parts by weight:
5 parts of sweetgum resin
5 parts by weight of 1: 1: 1 mixture of lanthana, neodymia and zirconia
200 parts of phenolic resin
5 parts by weight of a mixture of 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane, 3- (2-aminoethylamine) propylmethyldimethoxysilane and gamma-aminoethylaminopropyltrimethoxysilane
50 parts by mass of the components are 2: 1 oyster powder and glass beads;
the above raw materials were reacted at 135 ℃ for 2 hours with stirring.
2) Adopting modified phenolic resin powder, and spraying glue by using a spray gun according to the addition amount of 10% of the glue application amount;
(3) assembling and hot pressing: uniformly paving the glued bamboo fiber bundles into a plate blank, and then carrying out hot pressing at a unit pressure of 0.8Mpa and a temperature of 160 ℃ for 1min/mm according to the thickness of a finished plate;
(4) sawing: and (3) cutting edges of the plate blank, sanding, and then conveying the plate blank into a constant-temperature and constant-humidity room for health preservation, wherein the balanced water content of the constant-temperature and constant-humidity room is set according to the annual average balanced water content of the light-color outdoor recombined bamboo wood use region which is 2% lower.
Comparative example 1:
the difference from the embodiment 1 is that: and step one, the softening liquid is 2mol/L NaOH, and the bamboo chips are soaked in the 2mol/L NaOH for 2 hours.
Comparative example 2:
the difference from the embodiment 1 is that: in the second step, after being soaked for 5min by using commercial phenolic resin with 20 percent of solid content, the phenolic resin is dried at 80 ℃ until the water content is less than or equal to 16 percent;
the glue is sprayed by a spray gun according to the addition amount of 10 percent of glue application amount by adopting commercial phenolic resin powder.
Comparative example 3:
the difference from the embodiment 1 is that: the difference from the embodiment 1 is that: in the second step, after being soaked for 5min by using commercial phenolic resin with 20 percent of solid content, the phenolic resin is dried at 80 ℃ until the water content is less than or equal to 16 percent;
the glue is sprayed by a spray gun according to the addition amount of 20 percent of glue application amount by adopting commercial phenolic resin powder.
Comparative example 4:
the difference from the embodiment 1 is that: the softening liquid in the first step is 2mol/L NaOH, bamboo chips are soaked in the 2mol/L NaOH for 2 hours,
the difference from the embodiment 1 is that: in the second step, after being soaked for 5min by using commercial phenolic resin with 20 percent of solid content, the phenolic resin is dried at 80 ℃ until the water content is less than or equal to 16 percent;
the glue is sprayed by a spray gun according to the addition amount of 10 percent of glue application amount by adopting commercial phenolic resin powder.
Example of effects:
static bending strength and internal bond strength of fiber sheets were measured for examples 1 to 3 and comparative examples 1 to 4, and CIE L a color values of the fiber bundles prepared in the first measuring step were measured using a Minolta CR-300 color measuring device, and the results are shown in table 1.
TABLE 1
Through the sample data results in table 1, it is verified that in examples 1 to 3, the softening step is softened in multiple steps, the acid treatment time in the softening step is reduced, the fiber strength is improved, the color influence of the softening liquid on the bamboo fibers is also reduced, the bonding strength between the bamboo fiber bundles and the resin is greatly improved under the combined action of the softening liquid and the modified phenolic resin, the strength is ensured, and the sizing amount of the phenolic resin is reduced, so that the release amount of formaldehyde and other harmful substances is reduced.
Claims (9)
1. A manufacturing method of light-colored outdoor recombined bamboo wood is characterized by comprising the following steps,
(1) unit preparation: bamboo chips are used as raw materials, and bamboo fiber bundles are prepared after softening, rolling and carding;
(2) drying and gumming: drying the bamboo fiber bundles, and then placing the dried bamboo fiber bundles into modified phenolic resin for dipping and sizing;
(3) assembling and hot pressing: uniformly paving the glued bamboo fiber bundles into a plate blank, and then sending the plate blank into a hot press for hot press molding;
(4) sawing: cutting edges and sanding the plate blank subjected to hot press molding, and then sending the plate blank into a constant-temperature and constant-humidity room for health preservation to prepare light-color outdoor recombined bamboo wood;
wherein the softening in the step (1) comprises placing bamboo chips in softening liquid, softening to obtain softened bamboo chips, carding the bamboo chips treated by the solution in a rolling machine into bamboo bundles which are longitudinally continuous, transversely loose and connected in a staggered manner, beating by a hammer with a buffer effect, and washing to obtain bamboo fiber bundles,
the softening liquid comprises a first step softening liquid, a second step softening liquid and a third step softening liquid,
the first step softening liquid comprises glacial acetic acid, maleic anhydride and dicyclohexylcarbodiimide;
the softening liquid in the second step comprises one or a mixture of at least two of mucilaginous enzyme, hemicellulase and pectinase, and also comprises vitamin C;
the softening liquid in the third step comprises alkaline water and vegetable oil.
2. The method as claimed in claim 1, wherein the step (2) of drying the bamboo fiber bundle at 100-105 ℃ until the moisture content is 6-12%,
1) dipping the modified phenolic resin glue with 20 to 25 percent of solid content for 5 to 10min, and drying the glue at 80 ℃ until the water content is less than or equal to 16 percent;
2) modified phenolic resin powder is adopted, and glue is sprayed by a spray gun according to the addition amount of 10% -20% of the glue application amount.
3. The method for manufacturing the light-colored outdoor reconstituted bamboo wood as claimed in claim 2, wherein in the step (3), after the bamboo fiber bundles are uniformly assembled, the hot pressing unit pressure is 0.4-0.8Mpa, the hot pressing temperature is 140-180 ℃, and the hot pressing time is 1-1.5min/mm according to the thickness of a finished product plate.
4. The manufacturing method of the light-colored outdoor reconstituted bamboo wood according to claim 3, wherein in the step (4), the plate blank is cut to be edged, sanded and then sent into a constant-temperature and constant-humidity room for health preservation, and the equilibrium moisture content of the constant-temperature and constant-humidity room is set according to that the annual average equilibrium moisture content of the use region of the light-colored outdoor reconstituted bamboo wood is 2% lower.
5. The method of manufacturing a light-colored outdoor reconstituted bamboo material according to claim 1,
in the step (1), the bamboo chips are firstly placed into glacial acetic acid for soaking, the bamboo chips are soaked for 5 to 20min at the temperature of between 70 and 85 ℃ for primary acylation treatment, the glacial acetic acid solution is removed, the temperature is reduced to between 45 and 65 ℃, the bamboo chips are added into the mixed solution of maleic anhydride and dicyclohexylcarbodiimide for soaking for 5 to 20min for secondary acylation treatment,
placing the above two-stage acylation processed bamboo chips into 0.5-0.7% of the softening solution of the second step, simultaneously adding 0.5% of vitamin C, performing enzymolysis for 20min,
adding vegetable oil into alkaline water for emulsification, and soaking the bamboo chips subjected to enzymolysis treatment in the emulsified vegetable oil for 20-30 min.
6. The method for manufacturing the light-colored outdoor recombined bamboo wood as claimed in claim 1, 2, 3,4 or 5, wherein the modified phenolic resin is prepared from the following raw materials in parts by weight:
2-5 parts of sweetgum resin
6-8 parts of nano rare earth oxide
100-200 parts of phenolic resin
3-5 parts of silane coupling agent
20-50 parts of a filler;
the above raw materials are stirred and reacted for 2-4 hours at 135-165 ℃.
7. The method as claimed in claim 6, wherein the nano rare earth oxide comprises one or a mixture of at least two of lanthanum oxide, neodymium oxide and zirconium oxide.
8. The method of claim 6, wherein the silane coupling agent comprises one or a mixture of 2- (3, 4-epoxycyclohexane) ethyltrimethoxysilane, 3- (2-aminoethylamine) propylmethyldimethoxysilane, and γ -aminoethylaminopropyltrimethoxysilane.
9. The method for manufacturing the light-colored outdoor reconstituted bamboo wood according to claim 6, wherein the filler comprises the following components in a mass ratio of 2: 1 oyster powder and glass beads.
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| CN113667432B (en) * | 2021-08-20 | 2022-06-28 | 广东省林业科学研究院 | Bamboo-based fiber composite material based on modified adhesive and novel assembly mode and preparation method and application thereof |
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