CN108789764B - Processing method of high-density oriented strand board - Google Patents
Processing method of high-density oriented strand board Download PDFInfo
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- CN108789764B CN108789764B CN201810635815.5A CN201810635815A CN108789764B CN 108789764 B CN108789764 B CN 108789764B CN 201810635815 A CN201810635815 A CN 201810635815A CN 108789764 B CN108789764 B CN 108789764B
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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
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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
- 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
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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
- B27N3/002—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
- B27N3/08—Moulding or pressing
- B27N3/10—Moulding of mats
- B27N3/14—Distributing or orienting the particles or fibres
- B27N3/143—Orienting the particles or fibres
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a processing method of a high-density oriented strand board, which relates to the technical field of wood processing and comprises the following steps: (1) drying wood shavings, (2) processing glue-mixed wood shavings, (3) processing plate blanks, and (4) molding a high-density oriented strand board. The high-density oriented strand board is prepared by the process, the process operation is simple and easy to implement, the process repeatability is good, the product qualification rate is high, the used wood shavings can be derived from logs and wood leftovers, and the wood utilization rate is greatly improved; and the mechanical property of the prepared high-density oriented strand board is excellent, the structural property of the box board can be improved, and the service quality of the box board is ensured, so that the oriented strand board is suitable for processing the box board.
Description
The technical field is as follows:
the invention relates to the technical field of wood processing, in particular to a processing method of a high-density oriented strand board.
Background art:
the artificial board is a board made of wood or other non-wood plants as raw materials, which is processed into veneers, shavings or fibers and other different shapes, and then recombined with or without adhesives and other additives, and mainly comprises plywood, shaving board and fiberboard.
The shaving board is an artificial board made up by cutting raw materials of wood, etc. into chips with a certain specification, drying, mixing with adhesive, hardening agent and water-proofing agent and pressing at a certain temp. The oriented shaving board is a new shaving board, and the mixed glue shavings are longitudinally arranged according to the fiber direction of the mixed glue shavings when the shavings are paved and formed, so that the shavings are pressed into the shaving board, the shape of the shaving board is similar to that of the plywood, the shaving board is often used for replacing the plywood, and the oriented shaving board has the remarkable advantages of fully utilizing small-diameter wood, fast-growing wood, improving the utilization rate of wood and the like.
The use of adhesives during the processing of oriented strand board has a critical influence on the quality of the board. In the mixing process of the wood shavings and the adhesive, the adhesive can permeate into the wood shavings, so that the mechanical strength of the wood shavings is improved. The prior adhesive comprises a solvent adhesive and a water-based adhesive, and the solvent adhesive has good bonding performance but strong environmental pollution; the water-based adhesive does not pollute the environment, but has limited bonding performance, and if the water solubility of the resin used by the adhesive is poor, the water content of the adhesive is very high, so that water is heated and vaporized during high-temperature hot pressing, and the gas quantity is increased, thereby increasing the risk of plate explosion.
The invention content is as follows:
the technical problem to be solved by the invention is to provide a processing method of a high-density oriented strand board, the process is simple and easy to operate, the process repeatability is good, and the product qualification rate is high; and the mechanical property of the prepared high-density oriented strand board is excellent, the structural property of the box board can be improved, and the service quality of the box board is ensured, so that the oriented strand board is suitable for processing the box board.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a processing method of a high-density oriented strand board comprises the following steps:
(1) drying the wood shavings: drying the wood shavings by using 300-plus 400 ℃ mixed flue gas to reduce the water content to 2-4%;
(2) processing the glue-mixed wood shavings: heating wood shavings and the water-based adhesive to 70-80 ℃, stirring and mixing to reduce the mass water content to below 5%, and obtaining glue-mixed wood shavings;
(3) processing a plate blank: paving the mixed wood shavings by using a three-layer paving head, wherein the mixed wood shavings comprise an upper surface layer, a core layer and a lower surface layer, the core layer is paved transversely, and the upper surface layer and the lower surface layer are paved longitudinally to obtain a plate blank;
(4) molding a high-density oriented strand board: pre-pressing and then hot-pressing the plate blank, wherein the pre-pressing temperature is 40-50 ℃, the pre-pressing pressure is 2-5MPa, the pre-pressing time is 30-120s of pre-pressing of the high-density oriented strand board with the thickness of each mm, the hot-pressing temperature is 130-;
the water-based adhesive is prepared from the following raw materials in parts by weight: 30-40 parts of epoxy acrylic resin, 1-5 parts of fumed silica, 1-5 parts of hydroxypropyl methyl cellulose, 1-5 parts of emulsifier, 1-5 parts of hydrogenated castor oil and 0.5-1 part of nano titanium dioxide, wherein the preparation method comprises the following steps: adding all the raw materials into water, heating to 60-70 ℃, stirring until the viscosity is unchanged, then sending the obtained mixture into a ball mill, and ball-milling until the fineness is less than 30 mu m to obtain the water-based adhesive with the solid content of 70-80%.
The application amount of the water-based adhesive is 0.05-0.5kg of the water-based adhesive mixed with each kg of wood shavings.
The preparation method of the epoxy acrylic resin comprises the following steps: dissolving epoxy resin in a mixed solvent of N-butyl alcohol and ethylene glycol monomethyl ether, heating to the temperature of 100-110 ℃, adding methacrylic acid and N, N-dimethylethanolamine, carrying out heat preservation reaction at the temperature of 100-110 ℃, carrying out esterification reaction until the acid value is lower than 5mg/KOH, naturally cooling to room temperature, adding N-hydroxymethyl acrylamide, dimethyl magnesium acrylate and azobisisobutyronitrile, heating to the temperature of 80-90 ℃, carrying out heat preservation reaction, carrying out reduced pressure distillation after the polymerization reaction is finished, recovering N-butyl alcohol and ethylene glycol monomethyl ether, and concentrating the residue to obtain the epoxy acrylic resin.
The mass ratio of the epoxy resin, the methacrylic acid, the N, N-dimethylethanolamine, the N-hydroxymethyl acrylamide, the magnesium dimethacrylate and the azobisisobutyronitrile is 25-40:1-10:0.05-0.5:1-10:10-20: 0.5-1.
The emulsifier is selected from one of fatty alcohol polyoxyethylene ether, oleic acid polyoxyethylene ether, alkylphenol polyoxyethylene ether and castor oil polyoxyethylene ether.
The emulsifier adopts polyglutamic acid/polyethylene glycol ester, is prepared by esterification reaction of soil-grade polyglutamic acid and polyethylene glycol 400, and the preparation method comprises the following steps: dissolving soil-grade polyglutamic acid and polyethylene glycol 400 in water, dropwise adding dilute sulfuric acid to adjust the pH value to 4-5, heating to 70-80 ℃, carrying out heat preservation reaction, sending the obtained mixture into a spray dryer after the esterification reaction is finished, drying the obtained particles, and preparing the particles into micro powder by an ultrafine pulverizer to obtain the polyglutamic acid/polyethylene glycol esterified substance.
The mass ratio of the soil-grade polyglutamic acid to the polyethylene glycol 400 is 1-10: 1-10.
The invention has the beneficial effects that:
(1) according to the invention, methacrylic acid and epoxy resin are subjected to esterification reaction, and then, the esterification reaction, N-hydroxymethyl acrylamide and magnesium dimethacrylate are subjected to polymerization reaction to generate epoxy acrylic resin, and the generated epoxy acrylic resin has good hydrophilicity and excellent adhesive property;
(2) according to the invention, the emulsifier is used in combination, so that the hydrophilicity of the prepared epoxy acrylic resin is further enhanced, and the epoxy acrylic resin is dissolved in water to form a transparent colloid, so that the water-based adhesive with strong environmental protection property is prepared, and the gluing environment is improved; the adhesive property of the adhesive is further improved by the matching use of the self-made emulsifier, so that the adhesive can penetrate into the wood shavings, and the mechanical strength of the wood shavings is further improved;
(3) the high-density oriented strand board is prepared by the process, the process operation is simple and easy to implement, the process repeatability is good, the product qualification rate is high, the used wood shavings can be derived from logs and wood leftovers, and the wood utilization rate is greatly improved; and the mechanical property of the prepared high-density oriented strand board is excellent, the structural property of the box board can be improved, and the service quality of the box board is ensured, so that the oriented strand board is suitable for processing the box board.
The specific implementation mode is as follows:
in order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1
Processing the high-density oriented strand board:
(1) drying the wood shavings: drying the wood shavings by using mixed flue gas at 350 ℃ to reduce the water content to 3%;
(2) processing the glue-mixed wood shavings: heating the wood shavings and the water-based adhesive to 75 ℃, stirring and mixing to reduce the mass water content to 3% so as to obtain glue-mixed wood shavings; the application amount of the water-based adhesive is 0.25kg of the water-based adhesive mixed with each kg of wood shavings;
(3) processing a plate blank: paving the mixed wood shavings by using a three-layer paving head, wherein the mixed wood shavings comprise an upper surface layer, a core layer and a lower surface layer, the core layer is paved transversely, and the upper surface layer and the lower surface layer are paved longitudinally to obtain a plate blank;
(4) molding a high-density oriented strand board: pre-pressing and then hot-pressing the plate blank, wherein the pre-pressing temperature is 50 ℃, the pre-pressing pressure is 3.5MPa, the pre-pressing time is 90s for pre-pressing the high-density oriented strand board with the thickness of each mm, the hot-pressing temperature is 135 ℃, the hot-pressing pressure is 5MPa, and the hot-pressing time is 120s for hot-pressing the high-density oriented strand board with the thickness of each mm, so that the high-density oriented strand board is obtained;
preparing a water-based adhesive: adding 40g of epoxy acrylic resin, 4g of fumed silica, 3g of hydroxypropyl methyl cellulose, 3g of emulsifier AEO-9, 2g of hydrogenated castor oil and 0.5g of nano titanium dioxide into water, heating to 70 ℃, stirring until the viscosity is unchanged, feeding the obtained mixture into a ball mill, and ball-milling until the fineness is less than 30 mu m to obtain the water-based adhesive with the solid content of 75%.
Preparation of epoxy acrylic resin: firstly, 40g of epoxy resin E-51 is dissolved in a mixed solvent of N-butyl alcohol and ethylene glycol methyl ether, the temperature is raised to 110 ℃, 4g of methacrylic acid and 0.5g N, N-dimethylethanolamine are added, the temperature is kept at 110 ℃, the esterification reaction is carried out until the acid value is lower than 5mg/KOH, the mixture is naturally cooled to the room temperature, then 8g N-hydroxymethyl acrylamide, 20g of magnesium dimethacrylate and 1g of azobisisobutyronitrile are added, the temperature is raised to 90 ℃, the temperature is kept for reaction, the N-butyl alcohol and the ethylene glycol methyl ether are recovered by reduced pressure distillation after the polymerization reaction is finished, and the concentrated remainder is the epoxy acrylic resin.
Example 2
Processing the high-density oriented strand board:
(1) drying the wood shavings: drying the wood shavings by using mixed flue gas at 350 ℃ to reduce the water content to 3%;
(2) processing the glue-mixed wood shavings: heating the wood shavings and the water-based adhesive to 75 ℃, stirring and mixing to reduce the mass water content to 3% so as to obtain glue-mixed wood shavings; the application amount of the water-based adhesive is 0.25kg of the water-based adhesive mixed with each kg of wood shavings;
(3) processing a plate blank: paving the mixed wood shavings by using a three-layer paving head, wherein the mixed wood shavings comprise an upper surface layer, a core layer and a lower surface layer, the core layer is paved transversely, and the upper surface layer and the lower surface layer are paved longitudinally to obtain a plate blank;
(4) molding a high-density oriented strand board: pre-pressing and then hot-pressing the plate blank, wherein the pre-pressing temperature is 50 ℃, the pre-pressing pressure is 3.5MPa, the pre-pressing time is 90s for pre-pressing the high-density oriented strand board with the thickness of each mm, the hot-pressing temperature is 135 ℃, the hot-pressing pressure is 5MPa, and the hot-pressing time is 120s for hot-pressing the high-density oriented strand board with the thickness of each mm, so that the high-density oriented strand board is obtained;
preparing a water-based adhesive: adding 40g of epoxy acrylic resin, 4g of fumed silica, 3g of hydroxypropyl methyl cellulose, 3g of emulsifier EL-40, 2g of hydrogenated castor oil and 0.5g of nano titanium dioxide into water, heating to 70 ℃, stirring until the viscosity is unchanged, feeding the obtained mixture into a ball mill, and ball-milling until the fineness is less than 30 mu m to obtain the water-based adhesive with the solid content of 75%.
Preparation of epoxy acrylic resin: firstly, 40g of epoxy resin E-51 is dissolved in a mixed solvent of N-butyl alcohol and ethylene glycol methyl ether, the temperature is raised to 110 ℃, 4g of methacrylic acid and 0.5g N, N-dimethylethanolamine are added, the temperature is kept at 110 ℃, the esterification reaction is carried out until the acid value is lower than 5mg/KOH, the mixture is naturally cooled to the room temperature, then 8g N-hydroxymethyl acrylamide, 20g of magnesium dimethacrylate and 1g of azobisisobutyronitrile are added, the temperature is raised to 90 ℃, the temperature is kept for reaction, the N-butyl alcohol and the ethylene glycol methyl ether are recovered by reduced pressure distillation after the polymerization reaction is finished, and the concentrated remainder is the epoxy acrylic resin.
Example 3
Processing the high-density oriented strand board:
(1) drying the wood shavings: drying the wood shavings by using mixed flue gas at 350 ℃ to reduce the water content to 3%;
(2) processing the glue-mixed wood shavings: heating the wood shavings and the water-based adhesive to 75 ℃, stirring and mixing to reduce the mass water content to 3% so as to obtain glue-mixed wood shavings; the application amount of the water-based adhesive is 0.25kg of the water-based adhesive mixed with each kg of wood shavings;
(3) processing a plate blank: paving the mixed wood shavings by using a three-layer paving head, wherein the mixed wood shavings comprise an upper surface layer, a core layer and a lower surface layer, the core layer is paved transversely, and the upper surface layer and the lower surface layer are paved longitudinally to obtain a plate blank;
(4) molding a high-density oriented strand board: pre-pressing and then hot-pressing the plate blank, wherein the pre-pressing temperature is 50 ℃, the pre-pressing pressure is 3.5MPa, the pre-pressing time is 90s for pre-pressing the high-density oriented strand board with the thickness of each mm, the hot-pressing temperature is 135 ℃, the hot-pressing pressure is 5MPa, and the hot-pressing time is 120s for hot-pressing the high-density oriented strand board with the thickness of each mm, so that the high-density oriented strand board is obtained;
preparing a water-based adhesive: adding 40g of epoxy acrylic resin, 4g of fumed silica, 3g of hydroxypropyl methyl cellulose, 3g of emulsifier, 2g of hydrogenated castor oil and 0.5g of nano titanium dioxide into water, heating to 70 ℃, stirring until the viscosity is unchanged, feeding the obtained mixture into a ball mill, and ball-milling until the fineness is less than 30 mu m to obtain the water-based adhesive with the solid content of 75%.
Preparation of epoxy acrylic resin: firstly, 40g of epoxy resin E-51 is dissolved in a mixed solvent of N-butyl alcohol and ethylene glycol methyl ether, the temperature is raised to 110 ℃, 4g of methacrylic acid and 0.5g N, N-dimethylethanolamine are added, the temperature is kept at 110 ℃, the esterification reaction is carried out until the acid value is lower than 5mg/KOH, the mixture is naturally cooled to the room temperature, then 8g N-hydroxymethyl acrylamide, 20g of magnesium dimethacrylate and 1g of azobisisobutyronitrile are added, the temperature is raised to 90 ℃, the temperature is kept for reaction, the N-butyl alcohol and the ethylene glycol methyl ether are recovered by reduced pressure distillation after the polymerization reaction is finished, and the concentrated remainder is the epoxy acrylic resin.
Preparation of the emulsifier: dissolving 2.5g of soil-grade polyglutamic acid and 10g of polyethylene glycol 400 in water, dropwise adding dilute sulfuric acid to adjust the pH value to 4-5, heating to 80 ℃ for heat preservation reaction, sending the obtained mixture into a spray dryer after the esterification reaction is finished, and drying the obtained particles to obtain micro powder by a superfine pulverizer to obtain the polyglutamic acid/polyethylene glycol esterified substance.
Comparative example 1
Processing the high-density oriented strand board:
(1) drying the wood shavings: drying the wood shavings by using mixed flue gas at 350 ℃ to reduce the water content to 3%;
(2) processing the glue-mixed wood shavings: heating the wood shavings and the water-based adhesive to 75 ℃, stirring and mixing to reduce the mass water content to 3% so as to obtain glue-mixed wood shavings; the application amount of the water-based adhesive is 0.25kg of the water-based adhesive mixed with each kg of wood shavings;
(3) processing a plate blank: paving the mixed wood shavings by using a three-layer paving head, wherein the mixed wood shavings comprise an upper surface layer, a core layer and a lower surface layer, the core layer is paved transversely, and the upper surface layer and the lower surface layer are paved longitudinally to obtain a plate blank;
(4) molding a high-density oriented strand board: pre-pressing and then hot-pressing the plate blank, wherein the pre-pressing temperature is 50 ℃, the pre-pressing pressure is 3.5MPa, the pre-pressing time is 90s for pre-pressing the high-density oriented strand board with the thickness of each mm, the hot-pressing temperature is 135 ℃, the hot-pressing pressure is 5MPa, and the hot-pressing time is 120s for hot-pressing the high-density oriented strand board with the thickness of each mm, so that the high-density oriented strand board is obtained;
preparing a water-based adhesive: adding 40g of epoxy acrylic resin, 4g of fumed silica, 3g of hydroxypropyl methyl cellulose, 3g of polyethylene glycol 400, 2g of hydrogenated castor oil and 0.5g of nano titanium dioxide into water, heating to 70 ℃, stirring until the viscosity is unchanged, feeding the obtained mixture into a ball mill, and ball-milling until the fineness is less than 30 mu m to obtain the water-based adhesive with the solid content of 75%.
Preparation of epoxy acrylic resin: firstly, 40g of epoxy resin E-51 is dissolved in a mixed solvent of N-butyl alcohol and ethylene glycol methyl ether, the temperature is raised to 110 ℃, 4g of methacrylic acid and 0.5g N, N-dimethylethanolamine are added, the temperature is kept at 110 ℃, the esterification reaction is carried out until the acid value is lower than 5mg/KOH, the mixture is naturally cooled to the room temperature, then 8g N-hydroxymethyl acrylamide, 20g of magnesium dimethacrylate and 1g of azobisisobutyronitrile are added, the temperature is raised to 90 ℃, the temperature is kept for reaction, the N-butyl alcohol and the ethylene glycol methyl ether are recovered by reduced pressure distillation after the polymerization reaction is finished, and the concentrated remainder is the epoxy acrylic resin.
Comparative example 2
Processing the high-density oriented strand board:
(1) drying the wood shavings: drying the wood shavings by using mixed flue gas at 350 ℃ to reduce the water content to 3%;
(2) processing the glue-mixed wood shavings: heating the wood shavings and the water-based adhesive to 75 ℃, stirring and mixing to reduce the mass water content to 3% so as to obtain glue-mixed wood shavings; the application amount of the water-based adhesive is 0.25kg of the water-based adhesive mixed with each kg of wood shavings;
(3) processing a plate blank: paving the mixed wood shavings by using a three-layer paving head, wherein the mixed wood shavings comprise an upper surface layer, a core layer and a lower surface layer, the core layer is paved transversely, and the upper surface layer and the lower surface layer are paved longitudinally to obtain a plate blank;
(4) molding a high-density oriented strand board: pre-pressing and then hot-pressing the plate blank, wherein the pre-pressing temperature is 50 ℃, the pre-pressing pressure is 3.5MPa, the pre-pressing time is 90s for pre-pressing the high-density oriented strand board with the thickness of each mm, the hot-pressing temperature is 135 ℃, the hot-pressing pressure is 5MPa, and the hot-pressing time is 120s for hot-pressing the high-density oriented strand board with the thickness of each mm, so that the high-density oriented strand board is obtained;
preparing a water-based adhesive: adding 40g of epoxy acrylic resin, 4g of fumed silica, 3g of hydroxypropyl methyl cellulose, 3g of food-grade polyglutamic acid, 2g of hydrogenated castor oil and 0.5g of nano titanium dioxide into water, heating to 70 ℃, stirring until the viscosity is unchanged, feeding the obtained mixture into a ball mill, and ball-milling until the fineness is less than 30 mu m to obtain the water-based adhesive with the solid content of 75%.
Preparation of epoxy acrylic resin: firstly, 40g of epoxy resin E-51 is dissolved in a mixed solvent of N-butyl alcohol and ethylene glycol methyl ether, the temperature is raised to 110 ℃, 4g of methacrylic acid and 0.5g N, N-dimethylethanolamine are added, the temperature is kept at 110 ℃, the esterification reaction is carried out until the acid value is lower than 5mg/KOH, the mixture is naturally cooled to the room temperature, then 8g N-hydroxymethyl acrylamide, 20g of magnesium dimethacrylate and 1g of azobisisobutyronitrile are added, the temperature is raised to 90 ℃, the temperature is kept for reaction, the N-butyl alcohol and the ethylene glycol methyl ether are recovered by reduced pressure distillation after the polymerization reaction is finished, and the concentrated remainder is the epoxy acrylic resin.
Comparative example 3
Processing the high-density oriented strand board:
(1) drying the wood shavings: drying the wood shavings by using mixed flue gas at 350 ℃ to reduce the water content to 3%;
(2) processing the glue-mixed wood shavings: heating the wood shavings and the water-based adhesive to 75 ℃, stirring and mixing to reduce the mass water content to 3% so as to obtain glue-mixed wood shavings; the application amount of the water-based adhesive is 0.25kg of the water-based adhesive mixed with each kg of wood shavings;
(3) processing a plate blank: paving the mixed wood shavings by using a three-layer paving head, wherein the mixed wood shavings comprise an upper surface layer, a core layer and a lower surface layer, the core layer is paved transversely, and the upper surface layer and the lower surface layer are paved longitudinally to obtain a plate blank;
(4) molding a high-density oriented strand board: pre-pressing and then hot-pressing the plate blank, wherein the pre-pressing temperature is 50 ℃, the pre-pressing pressure is 3.5MPa, the pre-pressing time is 90s for pre-pressing the high-density oriented strand board with the thickness of each mm, the hot-pressing temperature is 135 ℃, the hot-pressing pressure is 5MPa, and the hot-pressing time is 120s for hot-pressing the high-density oriented strand board with the thickness of each mm, so that the high-density oriented strand board is obtained;
preparing a water-based adhesive: adding 40g of epoxy resin E-51, 4g of fumed silica, 3g of hydroxypropyl methyl cellulose, 3g of emulsifier, 2g of hydrogenated castor oil and 0.5g of nano titanium dioxide into water, heating to 70 ℃, stirring until the viscosity is unchanged, feeding the obtained mixture into a ball mill, and ball-milling until the fineness is less than 30 mu m to obtain the water-based adhesive with the solid content of 75%.
Preparation of the emulsifier: dissolving 2.5g of soil-grade polyglutamic acid and 10g of polyethylene glycol 400 in water, dropwise adding dilute sulfuric acid to adjust the pH value to 4-5, heating to 80 ℃ for heat preservation reaction, sending the obtained mixture into a spray dryer after the esterification reaction is finished, and drying the obtained particles to obtain micro powder by a superfine pulverizer to obtain the polyglutamic acid/polyethylene glycol esterified substance.
Comparative example 4
Processing the high-density oriented strand board:
(1) drying the wood shavings: drying the wood shavings by using mixed flue gas at 350 ℃ to reduce the water content to 3%;
(2) processing the glue-mixed wood shavings: heating the wood shavings and the water-based adhesive to 75 ℃, stirring and mixing to reduce the mass water content to 3% so as to obtain glue-mixed wood shavings; the application amount of the water-based adhesive is 0.25kg of the water-based adhesive mixed with each kg of wood shavings;
(3) processing a plate blank: paving the mixed wood shavings by using a three-layer paving head, wherein the mixed wood shavings comprise an upper surface layer, a core layer and a lower surface layer, the core layer is paved transversely, and the upper surface layer and the lower surface layer are paved longitudinally to obtain a plate blank;
(4) molding a high-density oriented strand board: pre-pressing and then hot-pressing the plate blank, wherein the pre-pressing temperature is 50 ℃, the pre-pressing pressure is 3.5MPa, the pre-pressing time is 90s for pre-pressing the high-density oriented strand board with the thickness of each mm, the hot-pressing temperature is 135 ℃, the hot-pressing pressure is 5MPa, and the hot-pressing time is 120s for hot-pressing the high-density oriented strand board with the thickness of each mm, so that the high-density oriented strand board is obtained;
preparing a water-based adhesive: adding 40g of epoxy acrylic resin, 4g of fumed silica, 3g of hydroxypropyl methyl cellulose, 3g of emulsifier, 2g of hydrogenated castor oil and 0.5g of nano titanium dioxide into water, heating to 70 ℃, stirring until the viscosity is unchanged, feeding the obtained mixture into a ball mill, and ball-milling until the fineness is less than 30 mu m to obtain the water-based adhesive with the solid content of 75%.
Preparation of epoxy acrylic resin: firstly, 40g of epoxy resin E-51 is dissolved in a mixed solvent of N-butyl alcohol and ethylene glycol methyl ether, the temperature is raised to 110 ℃, 4g of methacrylic acid and 0.5g N, N-dimethylethanolamine are added, the temperature is kept at 110 ℃, the esterification reaction is carried out until the acid value is lower than 5mg/KOH, the mixture is naturally cooled to the room temperature, then 8g of hydroxyethyl methacrylate, 20g of magnesium dimethacrylate and 1g of azodiisobutyronitrile are added, the temperature is raised to 90 ℃, the temperature is kept for reaction, the N-butyl alcohol and the ethylene glycol methyl ether are recovered by reduced pressure distillation after the polymerization reaction is finished, and the epoxy acrylic resin is obtained after the residue is concentrated.
Preparation of the emulsifier: dissolving 2.5g of soil-grade polyglutamic acid and 10g of polyethylene glycol 400 in water, dropwise adding dilute sulfuric acid to adjust the pH value to 4-5, heating to 80 ℃ for heat preservation reaction, sending the obtained mixture into a spray dryer after the esterification reaction is finished, and drying the obtained particles to obtain micro powder by a superfine pulverizer to obtain the polyglutamic acid/polyethylene glycol esterified substance.
Comparative example 5
Processing the high-density oriented strand board:
(1) drying the wood shavings: drying the wood shavings by using mixed flue gas at 350 ℃ to reduce the water content to 3%;
(2) processing the glue-mixed wood shavings: heating the wood shavings and the water-based adhesive to 75 ℃, stirring and mixing to reduce the mass water content to 3% so as to obtain glue-mixed wood shavings; the application amount of the water-based adhesive is 0.25kg of the water-based adhesive mixed with each kg of wood shavings;
(3) processing a plate blank: paving the mixed wood shavings by using a three-layer paving head, wherein the mixed wood shavings comprise an upper surface layer, a core layer and a lower surface layer, the core layer is paved transversely, and the upper surface layer and the lower surface layer are paved longitudinally to obtain a plate blank;
(4) molding a high-density oriented strand board: pre-pressing and then hot-pressing the plate blank, wherein the pre-pressing temperature is 50 ℃, the pre-pressing pressure is 3.5MPa, the pre-pressing time is 90s for pre-pressing the high-density oriented strand board with the thickness of each mm, the hot-pressing temperature is 135 ℃, the hot-pressing pressure is 5MPa, and the hot-pressing time is 120s for hot-pressing the high-density oriented strand board with the thickness of each mm, so that the high-density oriented strand board is obtained;
preparing a water-based adhesive: adding 40g of epoxy acrylic resin, 4g of fumed silica, 3g of hydroxypropyl methyl cellulose, 3g of emulsifier, 2g of hydrogenated castor oil and 0.5g of nano titanium dioxide into water, heating to 70 ℃, stirring until the viscosity is unchanged, feeding the obtained mixture into a ball mill, and ball-milling until the fineness is less than 30 mu m to obtain the water-based adhesive with the solid content of 75%.
Preparation of epoxy acrylic resin: firstly, 40g of epoxy resin E-51 is dissolved in a mixed solvent of N-butyl alcohol and ethylene glycol methyl ether, the temperature is raised to 110 ℃, 4g of methacrylic acid and 0.5g N, N-dimethylethanolamine are added, the temperature is kept at 110 ℃, the esterification reaction is carried out until the acid value is lower than 5mg/KOH, the mixture is naturally cooled to the room temperature, then 8g N-hydroxymethyl acrylamide, 20g of methyl methacrylate and 1g of azobisisobutyronitrile are added, the temperature is raised to 90 ℃, the temperature is kept for reaction, the N-butyl alcohol and the ethylene glycol methyl ether are recovered by reduced pressure distillation after the polymerization reaction is finished, and the concentrated remainder is the epoxy acrylic resin.
Preparation of the emulsifier: dissolving 2.5g of soil-grade polyglutamic acid and 10g of polyethylene glycol 400 in water, dropwise adding dilute sulfuric acid to adjust the pH value to 4-5, heating to 80 ℃ for heat preservation reaction, sending the obtained mixture into a spray dryer after the esterification reaction is finished, and drying the obtained particles to obtain micro powder by a superfine pulverizer to obtain the polyglutamic acid/polyethylene glycol esterified substance.
Example 4
Based on example 3, comparative example 1 in which polyethylene glycol 400 was used as an emulsifier in the preparation of an adhesive, comparative example 2 in which soil-grade polyglutamic acid was used as an emulsifier in the preparation of an adhesive, comparative example 3 in which epoxy resin E-51 was used instead of epoxy acrylic resin in the preparation of an adhesive, comparative example 4 in which hydroxyethyl methacrylate was used instead of N-methylolacrylamide in the preparation of epoxy acrylic resin, and comparative example 5 in which methyl methacrylate was used instead of magnesium dimethacrylate in the preparation of epoxy acrylic resin were provided.
The same specification of high density oriented strand board was processed using examples 1-3 and comparative examples 1-5, respectively, wherein the shavings were shavings cut from logs in the same batch. And the performance test of the high-density oriented strand board is carried out, and the test result is shown in the table 1 in the test standard GB/T17657-1999.
TABLE 1 performance properties of high density oriented strand board made according to the examples of the present invention
As can be seen from table 1, the use of the adhesive has a great influence on the mechanical properties of the manufactured high-density oriented strand board, and the addition of the emulsifier for preparing the adhesive and the difference of the main material resin directly influence the mechanical properties of the manufactured high-density oriented strand board.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A processing method of a high-density oriented strand board is characterized by comprising the following steps:
(1) drying the wood shavings: drying the wood shavings by using 300-plus 400 ℃ mixed flue gas to reduce the water content to 2-4%;
(2) processing the glue-mixed wood shavings: heating wood shavings and the water-based adhesive to 70-80 ℃, stirring and mixing to reduce the mass water content to below 5%, and obtaining glue-mixed wood shavings;
(3) processing a plate blank: paving the mixed wood shavings by using a three-layer paving head, wherein the mixed wood shavings comprise an upper surface layer, a core layer and a lower surface layer, the core layer is paved transversely, and the upper surface layer and the lower surface layer are paved longitudinally to obtain a plate blank;
(4) molding a high-density oriented strand board: pre-pressing and then hot-pressing the plate blank, wherein the pre-pressing temperature is 40-50 ℃, the pre-pressing pressure is 2-5MPa, the pre-pressing time is 30-120s of pre-pressing of the high-density oriented strand board with the thickness of each mm, the hot-pressing temperature is 130-;
the water-based adhesive is prepared from the following raw materials in parts by weight: 30-40 parts of epoxy acrylic resin, 1-5 parts of fumed silica, 1-5 parts of hydroxypropyl methyl cellulose, 1-5 parts of emulsifier, 1-5 parts of hydrogenated castor oil and 0.5-1 part of nano titanium dioxide, wherein the preparation method comprises the following steps: adding all the raw materials into water, heating to 60-70 ℃, stirring until the viscosity is unchanged, then sending the obtained mixture into a ball mill, and ball-milling until the fineness is less than 30 mu m to obtain the water-based adhesive with the solid content of 70-80%;
the preparation method of the epoxy acrylic resin comprises the following steps: dissolving epoxy resin in a mixed solvent of N-butyl alcohol and ethylene glycol monomethyl ether, heating to the temperature of 100-110 ℃, adding methacrylic acid and N, N-dimethylethanolamine, carrying out heat preservation reaction at the temperature of 100-110 ℃, carrying out esterification reaction until the acid value is lower than 5mg/KOH, naturally cooling to room temperature, adding N-hydroxymethyl acrylamide, dimethyl magnesium acrylate and azobisisobutyronitrile, heating to the temperature of 80-90 ℃, carrying out heat preservation reaction, carrying out reduced pressure distillation after the polymerization reaction is finished, recovering N-butyl alcohol and ethylene glycol monomethyl ether, and concentrating the residue to obtain epoxy acrylic resin;
the emulsifier adopts polyglutamic acid/polyethylene glycol ester, is prepared by esterification reaction of soil-grade polyglutamic acid and polyethylene glycol 400, and the preparation method comprises the following steps: dissolving soil-grade polyglutamic acid and polyethylene glycol 400 in water, dropwise adding dilute sulfuric acid to adjust the pH value to 4-5, heating to 70-80 ℃, carrying out heat preservation reaction, sending the obtained mixture into a spray dryer after the esterification reaction is finished, drying the obtained particles, and preparing the particles into micro powder by an ultrafine pulverizer to obtain polyglutamic acid/polyethylene glycol esterified substance;
the mass ratio of the soil-grade polyglutamic acid to the polyethylene glycol 400 is 1-10: 1-10.
2. The method of processing high density oriented strand board of claim 1, wherein: the application amount of the water-based adhesive is 0.05-0.5kg of the water-based adhesive mixed with each kg of wood shavings.
3. The method of processing high density oriented strand board of claim 1, wherein: the mass ratio of the epoxy resin, the methacrylic acid, the N, N-dimethylethanolamine, the N-hydroxymethyl acrylamide, the magnesium dimethacrylate and the azobisisobutyronitrile is 25-40:1-10:0.05-0.5:1-10:10-20: 0.5-1.
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| CN103770187A (en) * | 2012-10-19 | 2014-05-07 | 北京泛欧瑞得科技有限公司 | Special type oriented strand board and manufacturing process thereof |
| CN104448162A (en) * | 2014-12-23 | 2015-03-25 | 河北科技大学 | Method for preparing epoxy acrylic resin used in waterborne ink for printing plastic film |
| CN105647329B (en) * | 2016-01-19 | 2018-11-09 | 深圳市长辉新材料科技有限公司 | A kind of aqueous polyurethane-epoxy resin modification acrylic acid ester emulsion and preparation method thereof |
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