CN111823351A - Preparation method of high-strength non-adhesive shaving board - Google Patents
Preparation method of high-strength non-adhesive shaving board Download PDFInfo
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- CN111823351A CN111823351A CN202010464497.8A CN202010464497A CN111823351A CN 111823351 A CN111823351 A CN 111823351A CN 202010464497 A CN202010464497 A CN 202010464497A CN 111823351 A CN111823351 A CN 111823351A
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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
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
- B27L11/08—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood fibres, e.g. produced by tearing
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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
- B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention relates to a preparation method of a high-strength non-adhesive shaving board, belonging to the technical field of artificial boards. The high-strength adhesive-free shaving board is prepared by taking poplar shaving pieces as raw materials and adding bamboo fibers, wherein a plurality of active hydroxyl groups exist in cellulose molecules of the poplar shaving pieces, the bonding force in the shaving pieces is enhanced under the action of pressure, cellulose and hemicellulose are promoted to be degraded at high temperature in the hot pressing process to generate a series of monosaccharides, the monosaccharides and the monosaccharides in the raw materials are dehydrated to form furfural substances, furfural is resinated in the hot pressing process, the bonding strength between the poplar shaving pieces and the bamboo fibers can be effectively improved, the mechanical strength of the adhesive-free shaving board is enhanced, the intercellular layer of the bamboo fibers is separated from cell walls through hot pressing, lignin in the intercellular layer of the bamboo fibers is extracted again, meanwhile, degradation products of the hemicellulose are deposited on the surfaces of the fibers, the adhesive effect is formed, and the bonding force between the poplar shaving pieces and the bamboo fibers is improved.
Description
Technical Field
The invention relates to a preparation method of a high-strength non-adhesive shaving board, belonging to the technical field of artificial boards.
Background
At present, most of domestic and foreign artificial board products are made of synthetic resin glue such as urea-formaldehyde resin or phenolic resin. The synthetic resin adhesive can release free formaldehyde in the production, processing and using processes of the artificial board, damage the human health and pollute the environment. The conventional methods for reducing the formaldehyde emission (such as reducing the molarity of the adhesive, adding a formaldehyde scavenger, and sealing the adhesive surface) can only temporarily reduce the free formaldehyde emission of the material, but cannot control the slow and repeated release of the free formaldehyde in the use process of the material, so that the problem of how to fundamentally control the formaldehyde pollution of the material is urgently solved at present.
In recent years, fire frequently occurs because interior decoration is becoming more and more luxurious to meet people's needs in modern buildings and decorations. Most interior materials are made of wood and wood, and most building fires are caused by ignition and spread of interior materials due to flammability and poor fire resistance. Therefore, the flame retardant treatment of wood and artificial boards has become an urgent task.
At present, the density of the shaving board which is researched more and has a mature board manufacturing technology is generally 0.45-0.9 g/cm3The method is mainly applied to the fields of furniture, floors, buildings, ship manufacturing and the like. In practical applications, many board-making applications (such as indoor sound and heat insulation and decoration) do not require high density and strength of the board, but require low mass and light density of the board.
The shaving board is a kind of artificial board made of wood particles or particles of other wood fiber materials and adhesive through pressing at a certain temperature and pressure. Can be used for manufacturing furniture, tables, floors, wall surfaces, office supplies and the like.
Particle board can be classified into different categories according to different classification methods. According to the structure of the particle board, the particle board can be classified into a homogeneous particle board, a multi-layer particle board, an oriented particle board, a wafer particle board and the like. According to the manufacturing method of the particle board, it can be classified into a flat-pressed particle board, an extruded particle board, etc. The used raw materials can be divided into wood particle boards, bamboo particle boards, cement particle boards, cotton stalk particle boards, straw particle boards and the like, and the particle boards made of novel materials such as cement particle boards and the like tend to be hot in recent years. And can be classified into a veneer chipboard and an unfinished chipboard according to the surface decoration condition. In some cases, particle boards are endowed with specific properties for use in special environments, and according to these different properties, particle boards are classified into anticorrosive particle boards, flame retardant particle boards, sound insulation particle boards, and the like.
At present, most of the artificial board products produced at home and abroad are made of urea-formaldehyde resin glue. The artificial board made of urea-formaldehyde glue has the problem of free formaldehyde release and has long duration. In order to protect the health of people, how to fundamentally control the formaldehyde release of the wood composite material is a very urgent problem for researchers. This has also promoted the development of glueless gluing techniques.
The artificial board glue-free gluing is that the traditional aldehyde-containing resin adhesive is not adopted, and the raw material basic units are glued into the board by means of chemical action of some chemical activators or catalysts on the raw material basic units to generate adhesive-like substances.
At present, the research of the glue-free artificial board at home and abroad mainly comprises the following methods: (1) the oxidation bonding method is to oxidize the surface of the treated material with an oxidant and then to form a plate by hot pressing. In order to improve the physical and mechanical strength and water resistance of the wood-based panel, a certain amount of cross-linking agent or joint mixture is usually added. (2) Free radical initiation method, spraying or painting wood surface with peroxide such as ammonia peroxide, sodium peroxide and other peroxides and some salts containing iron ions to activate them to generate free radicals, and then hot pressing; the free radicals initiate polymerization and cement to form the plate, which also includes oxidative bonding. (3) The alkali solution activating process treats the surface of timber with sodium hydroxide, sodium carbonate, potassium ammonium oxide and other alkali solutions to change the interface characteristic and surface chemical property and facilitate interface adhesion. (4) The acid catalyzed polycondensation process treats the surface of wooden material with sulfuric acid or other acid as catalyst to degrade cellulose or lignin partially and the degraded product produces polycondensation reaction under certain condition to form chemical combination between the interfaces. (5) The natural substance conversion method is characterized in that substances contained in the wood material or added natural substances are used as additives, and chemical conversion is carried out under certain hot pressing conditions to generate other new substances with the function of an adhesive or a cross-linking agent, so that self-generated gluing in the hot pressing process is realized.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problem of poor mechanical property of the existing non-adhesive shaving board, a preparation method of the high-strength non-adhesive shaving board is provided.
In order to solve the technical problems, the invention adopts the technical scheme that:
(1) placing the poplar shaving pieces, the short bamboo fibers, the viscous liquid, the white oil, the sodium stearate, the paraffin and the ammonium polyphosphate in a high-speed stirrer, and stirring at the normal temperature at the rotating speed of 3000-4000 r/min for 40-60 min to obtain a mixture;
(2) and (3) placing the mixture in a mold, placing the mold under a hot press for hot pressing for 8-10 min, demolding, placing the mold in an oven at 80-100 ℃ for drying for 1-2 h, and cooling at normal temperature to obtain the high-strength non-adhesive shaving board.
The weight parts of the poplar shaving pieces, the short bamboo fibers, the viscous liquid, the white oil, the sodium stearate, the paraffin and the ammonium polyphosphate are 80-100 parts of the poplar shaving pieces, 20-25 parts of the short bamboo fibers, 40-50 parts of the viscous liquid, 4-5 parts of the white oil, 8-10 parts of the sodium stearate, 12-15 parts of the paraffin and 8-10 parts of the ammonium polyphosphate.
The specification of the die in the step (2) is 500mm multiplied by 300mm, and the hot pressing treatment conditions are that the temperature is 180-200 ℃ and the pressure is 4-6 MPa.
The preparation method of the viscous liquid in the step (1) comprises the following specific steps:
(1) adding maltodextrin and carboxymethyl cellulose into deionized water, stirring for 20-30 min at 180-200 r/min under the water bath condition of 80-90 ℃, and preserving heat to obtain a mixed solution;
(2) adding sucrose and glucose into the mixed solution, cooling to 50-60 ℃, and stirring at a rotating speed of 200-250 r/min for 15-20 min to obtain a mixed sugar solution;
(3) and (3) placing the citric acid and the lactic acid in the mixed sugar solution, and stirring at the rotating speed of 300-340 r/min for 40-60 min at normal temperature to obtain viscous liquid.
The weight parts of the maltodextrin, the sucrose, the glucose, the citric acid, the lactic acid, the carboxymethyl cellulose and the deionized water are 30-40 parts of the maltodextrin, 15-20 parts of the sucrose, 15-20 parts of the glucose, 18-24 parts of the citric acid, 18-24 parts of the lactic acid, 12-16 parts of the carboxymethyl cellulose and 90-120 parts of the deionized water.
The short bamboo fiber prepared in the step (1) comprises the following specific preparation steps:
(1) adding sodium hydroxide into deionized water, and stirring at the rotating speed of 140-180 r/min for 10-15 min at normal temperature to obtain a sodium hydroxide solution;
(2) adding bamboo fibers into a sodium hydroxide solution, and stirring for 1-2 hours in a water bath at the temperature of 70-80 ℃ at the rotating speed of 200-250 r/min to obtain a bamboo fiber suspension;
(3) placing the bamboo fiber suspension in an ultrasonic dispersion machine, carrying out ultrasonic treatment for 30-40 min at 50-60 ℃, filtering, taking a filter cake, washing the filter cake to be neutral by using deionized water, and placing the filter cake in a drying oven at 60-80 ℃ for drying for 3-4 h to obtain alkali-treated bamboo fiber;
(4) and (3) placing the alkali-treated bamboo fibers in a shearing machine, and shearing for 4-6 min to obtain the short bamboo fibers.
The bamboo fiber, the sodium hydroxide and the deionized water are 20-30 parts by weight of bamboo fiber, 20-30 parts by weight of sodium hydroxide and 100-150 parts by weight of deionized water.
The power of ultrasonic treatment in the step (3) is 400-500W
And (4) the average length of the short bamboo fibers in the step (4) is 4-6 mm.
Compared with other methods, the method has the beneficial technical effects that:
(1) the invention takes poplar shaving pieces as raw materials and adds bamboo fiber to prepare a high-strength non-glue shaving board, a plurality of active hydroxyl groups exist in cellulose molecules of the poplar shaving pieces, under the action of pressure, the distance between the cellulose is closer and closer, when hydrogen atoms in the hydroxyl groups and hydrogen atoms with stronger electronegativity in the hydroxyl groups of adjacent cellulose molecules are linked into hydrogen bonds by negative valence bonds, the binding force in the shaving pieces is enhanced, in the hot pressing process, high temperature promotes the cellulose and hemicellulose to be degraded, a series of monosaccharide is generated, the monosaccharide and the monosaccharide in the raw materials are dehydrated to form furfural substances, furfural resinification can effectively improve the binding strength between the poplar shaving pieces and the bamboo fiber in the hot pressing process, thereby enhancing the mechanical strength of the non-glue shaving board, the surface of the bamboo fiber is treated by sodium hydroxide solution, and the interfacial property and the surface chemical property of the bamboo fiber are changed, the interface gluing is facilitated, after the hot pressing treatment, the bamboo fiber intercellular layer is separated from the cell wall and is covered on the fiber surface of the poplar wood shaving piece in a chip shape, the lignin in the bamboo fiber intercellular layer is extracted again, and meanwhile, the degradation product of the hemicellulose is deposited on the fiber surface to form the gluing effect, so that the bonding force between the poplar wood shaving piece and the bamboo fiber is improved;
(2) the invention takes cane sugar, glucose, citric acid and lactic acid as binders, and maltodextrin and carboxymethyl cellulose are added to prepare the high-strength non-glue shaving board, the gluing of the non-glue shaving board does not adopt the traditional resin-containing adhesive, the basic units of the raw materials are glued into the board by using chemical activators or catalysts to perform chemical action on the basic units of the raw materials to generate substances of adhesives, the cane sugar is a disaccharide which is composed of one molecule of glucose and one molecule of fructose, the cane sugar is extracted from sugar crops, namely beet or sugarcane, is safe and non-toxic, has good biocompatibility and degradability, the glucose is a monosaccharide which is polyhydroxy aldehyde, the glucose contains five hydroxyl groups and one aldehyde group, has the properties of polyalcohol and aldehyde, and the cane sugar and the glucose can perform esterification reaction with the citric acid and the lactic acid at high temperature, the esterification product can generate a cross-linking effect with lignin and bamboo fibers in the poplar shaving pieces to form a three-dimensional network structure, the bonding strength and the mechanical property of the shaving board can be improved, the maltodextrin has the characteristics of good solubility, difficult moisture absorption, good stability and difficult deterioration, the maltodextrin has strong thickening property, good carrier property and no moisture absorption, can effectively prevent moisture absorption of sugar, the carboxymethyl cellulose has good film-forming property, and the addition of the maltodextrin and the carboxymethyl cellulose can effectively prevent moisture absorption of the sugar, so that the mechanical property and the mechanical strength of the non-glue shaving board are effectively improved.
Detailed Description
Respectively weighing 20-30 parts by weight of bamboo fiber, 20-30 parts by weight of sodium hydroxide and 100-150 parts by weight of deionized water, adding the sodium hydroxide into the deionized water, stirring at the normal temperature for 10-15 min at the rotating speed of 140-180 r/min to obtain a sodium hydroxide solution, adding the bamboo fiber into the sodium hydroxide solution, stirring at the rotating speed of 200-250 r/min for 1-2 h in a water bath at the temperature of 70-80 ℃ to obtain a bamboo fiber suspension, placing the bamboo fiber suspension in an ultrasonic dispersion machine, carrying out ultrasonic treatment at the temperature of 50-60 ℃ for 30-40 min at 400-500W, filtering, taking a filter cake, washing the filter cake with deionized water to be neutral, placing the filter cake in an oven at the temperature of 60-80 ℃ for drying for 3-4 h to obtain alkali-treated bamboo fiber, placing the alkali-treated bamboo fiber in a shearing machine, and shearing for 4-6 min to obtain short bamboo fiber with the average length of 4-6 mm; respectively weighing 30-40 parts of maltodextrin, 15-20 parts of sucrose, 15-20 parts of glucose, 18-24 parts of citric acid, 18-24 parts of lactic acid, 12-16 parts of carboxymethyl cellulose and 90-120 parts of deionized water according to parts by weight, adding the maltodextrin and the carboxymethyl cellulose into the deionized water, stirring for 20-30 min at 180-200 r/min under the water bath condition of 80-90 ℃, preserving heat to obtain a mixed solution, adding the sucrose and the glucose into the mixed solution, cooling to 50-60 ℃, stirring for 15-20 min at the rotating speed of 200-250 r/min to obtain a mixed sugar solution, placing the citric acid and the lactic acid into the mixed sugar solution, and stirring for 40-60 min at the rotating speed of 300-340 r/min at normal temperature to obtain a viscous liquid; and then respectively weighing 80-100 parts of poplar shaving pieces, 20-25 parts of short bamboo fibers, 40-50 parts of viscous liquid, 4-5 parts of white oil, 8-10 parts of sodium stearate, 12-15 parts of paraffin and 8-10 parts of ammonium polyphosphate according to parts by weight, placing the poplar shaving pieces, the short bamboo fibers, the viscous liquid, the white oil, the sodium stearate, the paraffin and the ammonium polyphosphate in a high-speed stirrer, stirring at the normal temperature at the rotating speed of 3000-4000 r/min for 40-60 min to obtain a mixture, placing the mixture in a mold with the specification of 500mm, 500mm and 300mm, placing the mold under a hot press, carrying out hot pressing treatment at the temperature of 180-200 ℃ and the pressure of 4-6 MPa for 8-10 min, demolding, placing the mold in an oven with the temperature of 80-100 ℃ for drying for 1-2 h, and cooling at the normal temperature to obtain the high-strength non-adhesive particle board.
Example 1
Respectively weighing 20 parts of bamboo fiber, 20 parts of sodium hydroxide and 100 parts of deionized water according to parts by weight, adding the sodium hydroxide into the deionized water, stirring at the rotating speed of 140r/min for 10min at normal temperature to obtain a sodium hydroxide solution, adding the bamboo fiber into the sodium hydroxide solution, stirring at the rotating speed of 200r/min for 1h in a water bath at 70 ℃ to obtain a bamboo fiber suspension, placing the bamboo fiber suspension in an ultrasonic dispersion machine, carrying out ultrasonic treatment at 400W for 30min at 50 ℃, filtering, taking a filter cake, washing the filter cake to be neutral with the deionized water, placing the filter cake in a drying oven at 60 ℃ for drying for 3h to obtain alkali-treated bamboo fiber, placing the alkali-treated bamboo fiber in a shearing machine, and shearing for 4min to obtain short bamboo fiber with the average length of 4 mm; respectively weighing 30 parts of maltodextrin, 15 parts of cane sugar, 15 parts of glucose, 18 parts of citric acid, 18 parts of lactic acid, 12 parts of carboxymethyl cellulose and 90 parts of deionized water according to parts by weight, adding the maltodextrin and the carboxymethyl cellulose into the deionized water, stirring for 20min at 180r/min under the condition of 80 ℃ water bath, preserving heat to obtain a mixed solution, adding the cane sugar and the glucose into the mixed solution, cooling to 50 ℃, stirring for 15min at the rotating speed of 200r/min to obtain a mixed sugar solution, placing the citric acid and the lactic acid into the mixed sugar solution, and stirring for 40min at the rotating speed of 300r/min at normal temperature to obtain viscous liquid; and respectively weighing 80 parts of poplar shaving pieces, 20 parts of short bamboo fibers, 40 parts of viscous fluid, 4 parts of white oil, 8 parts of sodium stearate, 12 parts of paraffin and 8 parts of ammonium polyphosphate according to parts by weight, placing the poplar shaving pieces, the short bamboo fibers, the viscous fluid, the white oil, the sodium stearate, the paraffin and the ammonium polyphosphate in a high-speed stirrer, stirring at the rotating speed of 3000r/min for 40min at normal temperature to obtain a mixture, placing the mixture in a mold with the specification of 500mm, 500mm and 300mm, placing the mold under a hot press, carrying out hot pressing treatment for 8min under the conditions of the temperature of 180 ℃ and the pressure of 4MPa, demolding, placing the mold in an oven with the temperature of 80 ℃ for drying for 1h, and cooling at normal temperature to obtain the high-strength adhesive-free shaving board.
Example 2
Respectively weighing 25 parts of bamboo fiber, 25 parts of sodium hydroxide and 125 parts of deionized water according to parts by weight, adding the sodium hydroxide into the deionized water, stirring at the rotating speed of 160r/min for 12min at normal temperature to obtain a sodium hydroxide solution, adding the bamboo fiber into the sodium hydroxide solution, stirring at the rotating speed of 225r/min for 1h in a water bath at the temperature of 75 ℃ to obtain a bamboo fiber suspension, placing the bamboo fiber suspension in an ultrasonic dispersion machine, carrying out ultrasonic treatment at the temperature of 55 ℃ for 35min at the speed of 450W, filtering, taking a filter cake, washing the filter cake to be neutral with the deionized water, placing the filter cake in an oven at the temperature of 70 ℃ for drying for 3h to obtain alkali-treated bamboo fiber, placing the alkali-treated bamboo fiber in a shearing machine, and shearing for 5min to obtain short bamboo fiber with the average length of 5; respectively weighing 35 parts of maltodextrin, 18 parts of cane sugar, 18 parts of glucose, 21 parts of citric acid, 21 parts of lactic acid, 14 parts of carboxymethyl cellulose and 105 parts of deionized water, adding the maltodextrin and the carboxymethyl cellulose into the deionized water, stirring for 25min at 190r/min under the condition of a water bath at 85 ℃, preserving heat to obtain a mixed solution, adding the cane sugar and the glucose into the mixed solution, cooling to 55 ℃, stirring for 18min at the rotating speed of 225r/min to obtain a mixed sugar solution, placing the citric acid and the lactic acid into the mixed sugar solution, and stirring for 50min at the rotating speed of 320r/min at normal temperature to obtain viscous liquid; and respectively weighing 90 parts of poplar shaving pieces, 22 parts of short bamboo fibers, 45 parts of viscous fluid, 4 parts of white oil, 9 parts of sodium stearate, 14 parts of paraffin and 9 parts of ammonium polyphosphate according to parts by weight, placing the poplar shaving pieces, the short bamboo fibers, the viscous fluid, the white oil, the sodium stearate, the paraffin and the ammonium polyphosphate in a high-speed stirrer, stirring at the rotating speed of 3500r/min for 50min at normal temperature to obtain a mixture, placing the mixture in a mold with the specification of 500mm multiplied by 300mm, placing the mold under a hot press, carrying out hot pressing treatment for 9min at the temperature of 190 ℃ and the pressure of 5MPa, demolding, placing the mold in an oven with the temperature of 90 ℃ for drying for 1h, and cooling at normal temperature to obtain the high-strength non-adhesive shaving board.
Example 3
Respectively weighing 30 parts of bamboo fiber, 30 parts of sodium hydroxide and 150 parts of deionized water according to parts by weight, adding the sodium hydroxide into the deionized water, stirring at a rotation speed of 180r/min for 15min at normal temperature to obtain a sodium hydroxide solution, adding the bamboo fiber into the sodium hydroxide solution, stirring at a rotation speed of 250r/min for 2h in a water bath at 80 ℃ to obtain a bamboo fiber suspension, placing the bamboo fiber suspension in an ultrasonic dispersion machine, performing ultrasonic treatment at 500W for 40min at 60 ℃, filtering, taking a filter cake, washing the filter cake to be neutral with the deionized water, placing the filter cake in an oven at 80 ℃ for drying for 4h to obtain alkali-treated bamboo fiber, placing the alkali-treated bamboo fiber in a shearing machine, and shearing for 6min to obtain short bamboo fiber with an average length of 6 mm; respectively weighing 40 parts of maltodextrin, 20 parts of cane sugar, 20 parts of glucose, 24 parts of citric acid, 24 parts of lactic acid, 16 parts of carboxymethyl cellulose and 120 parts of deionized water according to parts by weight, adding the maltodextrin and the carboxymethyl cellulose into the deionized water, stirring for 30min at 200r/min under the condition of 90 ℃ water bath, preserving heat to obtain a mixed solution, adding the cane sugar and the glucose into the mixed solution, cooling to 60 ℃, stirring for 20min at the rotating speed of 250r/min to obtain a mixed sugar solution, placing the citric acid and the lactic acid into the mixed sugar solution, and stirring for 60min at the rotating speed of 340r/min at normal temperature to obtain viscous liquid; then weighing 100 parts of poplar shaving pieces, 25 parts of short bamboo fibers, 50 parts of viscous fluid, 5 parts of white oil, 10 parts of sodium stearate, 15 parts of paraffin and 10 parts of ammonium polyphosphate respectively, placing the poplar shaving pieces, the short bamboo fibers, the viscous fluid, the white oil, the sodium stearate, the paraffin and the ammonium polyphosphate in a high-speed stirrer, stirring at the normal temperature for 60min at the rotating speed of 4000r/min to obtain a mixture, placing the mixture in a mold with the specification of 500mm multiplied by 300mm, placing the mold in a hot press, carrying out hot pressing treatment for 10min under the conditions of the temperature of 200 ℃ and the pressure of 6MPa, demolding, placing the mold in an oven with the temperature of 100 ℃ for drying for 2h, and cooling at the normal temperature to obtain the high-strength non-adhesive shaving board.
Comparative example: a non-adhesive chipboard produced by Dongguan company.
The non-adhesive particle boards prepared in the examples and the comparative examples were tested, and the specific tests were as follows:
the performance indexes of the glue-free artificial board are as follows: static bending strength, elastic modulus, internal bonding strength. The test method refers to the measuring method specified in national standard GB/T11718-2009 Medium Density fiberboard.
The specific test results are shown in table 1.
Table 1 comparative table of property characterization
| Detecting items | Example 1 | Example 2 | Example 3 | Comparative example |
| Static bending strength/MPa | 21.2 | 21.3 | 20.8 | 9.5 |
| Modulus of elasticity/MPa | 1920 | 2210 | 2060 | 940 |
| Internal bond strength/MPa | 0.58 | 0.50 | 0.55 | 0.21 |
As can be seen from Table 1, the non-glue shaving board prepared by the invention has good mechanical properties.
Claims (9)
1. A preparation method of a high-strength non-adhesive shaving board is characterized by comprising the following specific preparation steps:
(1) placing the poplar shaving pieces, the short bamboo fibers, the viscous liquid, the white oil, the sodium stearate, the paraffin and the ammonium polyphosphate in a high-speed stirrer, and stirring at the normal temperature at the rotating speed of 3000-4000 r/min for 40-60 min to obtain a mixture;
(2) and (3) placing the mixture in a mold, placing the mold under a hot press for hot pressing for 8-10 min, demolding, placing the mold in an oven at 80-100 ℃ for drying for 1-2 h, and cooling at normal temperature to obtain the high-strength non-adhesive shaving board.
2. The preparation method of the high-strength non-glue shaving board according to claim 1, wherein the weight parts of the poplar shaving pieces, the short bamboo fibers, the viscous liquid, the white oil, the sodium stearate, the paraffin and the ammonium polyphosphate are 80-100 parts of the poplar shaving pieces, 20-25 parts of the short bamboo fibers, 40-50 parts of the viscous liquid, 4-5 parts of the white oil, 8-10 parts of the sodium stearate, 12-15 parts of the paraffin and 8-10 parts of the ammonium polyphosphate.
3. The method for preparing a high-strength non-adhesive chipboard as claimed in claim 1, wherein said mould in step (2) has a specification of 500mm x 300mm, and the hot pressing is performed at a temperature of 180-200 ℃ and a pressure of 4-6 MPa.
4. The method for preparing high-strength non-glue particle boards as claimed in claim 1, wherein the step (1) of preparing the viscous fluid comprises the following steps:
(1) adding maltodextrin and carboxymethyl cellulose into deionized water, stirring for 20-30 min at 180-200 r/min under the water bath condition of 80-90 ℃, and preserving heat to obtain a mixed solution;
(2) adding sucrose and glucose into the mixed solution, cooling to 50-60 ℃, and stirring at a rotating speed of 200-250 r/min for 15-20 min to obtain a mixed sugar solution;
(3) and (3) placing the citric acid and the lactic acid in the mixed sugar solution, and stirring at the rotating speed of 300-340 r/min for 40-60 min at normal temperature to obtain viscous liquid.
5. The method for preparing the high-strength non-glue shaving board according to claim 4, wherein the weight parts of the maltodextrin, the sucrose, the glucose, the citric acid, the lactic acid, the carboxymethyl cellulose and the deionized water are 30-40 parts of the maltodextrin, 15-20 parts of the sucrose, 15-20 parts of the glucose, 18-24 parts of the citric acid, 18-24 parts of the lactic acid, 12-16 parts of the carboxymethyl cellulose and 90-120 parts of the deionized water.
6. The method for preparing a high-strength non-adhesive particle board according to claim 1, wherein the short bamboo fibers prepared in step (1) are prepared by the following steps:
(1) adding sodium hydroxide into deionized water, and stirring at the rotating speed of 140-180 r/min for 10-15 min at normal temperature to obtain a sodium hydroxide solution;
(2) adding bamboo fibers into a sodium hydroxide solution, and stirring for 1-2 hours in a water bath at the temperature of 70-80 ℃ at the rotating speed of 200-250 r/min to obtain a bamboo fiber suspension;
(3) placing the bamboo fiber suspension in an ultrasonic dispersion machine, carrying out ultrasonic treatment for 30-40 min at 50-60 ℃, filtering, taking a filter cake, washing the filter cake to be neutral by using deionized water, and placing the filter cake in a drying oven at 60-80 ℃ for drying for 3-4 h to obtain alkali-treated bamboo fiber;
(4) and (3) placing the alkali-treated bamboo fibers in a shearing machine, and shearing for 4-6 min to obtain the short bamboo fibers.
7. The preparation method of the high-strength non-glue shaving board according to claim 6, wherein the weight parts of the bamboo fibers, the sodium hydroxide and the deionized water are 20-30 parts of the bamboo fibers, 20-30 parts of the sodium hydroxide and 100-150 parts of the deionized water.
8. The method for preparing high-strength non-adhesive chipboard as claimed in claim 6, wherein said ultrasonic treatment in step (3) is performed at a power of 400-500W.
9. The method for preparing a high-strength non-adhesive particle board according to claim 6, wherein the average length of the short bamboo fibers in the step (4) is 4-6 mm.
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