CN112175405A - High-strength wood-plastic composite board and preparation method thereof - Google Patents
High-strength wood-plastic composite board and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high-strength wood-plastic composite board and a preparation method thereof, belonging to the technical field of wood-plastic composite material preparation. The method comprises the steps of firstly mixing eucalyptus powder serving as a raw material with alkali liquor, carrying out alkali boiling, reacting filter residues obtained after the alkali boiling with phenol under the action of ammonia water to obtain pre-modified eucalyptus fibers, then preparing sucrose polyester by using sucrose, potassium oleate, potassium carbonate and methyl oleate, preparing the sucrose polyester, sodium silicate and citric acid into modified liquid, mixing the pre-modified eucalyptus fibers with the modified liquid, carrying out high-temperature mixing reaction to obtain modified eucalyptus fibers, finally blending the modified eucalyptus fibers with polypropylene and other auxiliary materials, and carrying out hot-pressing drying to obtain the high-strength wood-plastic composite board.
Description
Technical Field
The invention relates to a high-strength wood-plastic composite board and a preparation method thereof, belonging to the technical field of wood-plastic composite material preparation.
Background
The wood-plastic composite material is a novel composite material which is prepared by taking wood fibers or plant fibers and plastics as main raw materials through different processing modes such as filling, reinforcing, hot-pressing compounding, melt extrusion and the like. The method is mainly used in industries such as building materials, furniture, logistics packaging and the like. The wood-plastic composite material integrates the double advantages of wood and plastic, can overcome the use limitation caused by low wood strength, large variability, low elastic modulus of organic materials and the like, can fully utilize waste wood and plastic, saves energy, reduces emission, reduces environmental pollution, improves the added value of the material, and is a novel material with great development prospect. The wood-plastic composite material has the advantages of excellent water resistance, corrosion resistance and moth resistance, good dimensional stability, flexible production process, small damage to equipment, recyclability and the like, and is concerned by people.
The product is mainly used as a substitute of natural wood. One of the most important applications of wood-plastic composites is as a substitute for wood, which is widely used as outdoor building materials and outdoor decorative materials, such as outdoor floors, fences, terraces, wayside shelters, trestles, water passageways, open-air seats, highway sound-insulating walls, seaside floors, flower boxes, landscape architecture, and the like.
With the improvement of environmental awareness, materials based on plant resources are increasingly concerned by people, and the green comprehensive utilization of the plant resources becomes a research hotspot. The wood-plastic composite material and the artificial board are mainly used in large-scale industrial application in a plurality of plant-based materials, but the existing wood-plastic composite material generally has the problems that the compatibility of un-plasticized polar plant fibers and a non-polar plastic matrix interface is poor, the combination of plastics and wood fibers is not tight, the cohesiveness between the plastics and the wood fibers is poor, and the mechanical strength of the whole wood-plastic composite board is reduced.
Therefore, the invention of the high-strength wood-plastic composite board has long-term positive significance for the development of the technical field of building boards.
Disclosure of Invention
The invention mainly solves the technical problems that the conventional wood-plastic composite material generally has the problems that the compatibility of un-plasticized polar plant fibers and a nonpolar plastic matrix interface is poor, the combination of plastic and wood fibers is not tight, and the cohesiveness between the plastic and the wood fibers is poor, so that the mechanical strength of the whole wood-plastic composite plate is reduced, and provides a high-strength wood-plastic composite plate and a preparation method thereof.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a high strength wood-plastic composite panel, comprising: modified eucalyptus fibers, polypropylene, polyvinyl alcohol, montmorillonite and sodium dodecyl sulfate.
A high-strength wood-plastic composite board comprises the following components in parts by weight: 50-60 parts of modified eucalyptus fibers, 30-40 parts of polypropylene, 10-15 parts of polyvinyl alcohol, 2-3 parts of montmorillonite and 3-4 parts of sodium dodecyl sulfate.
A preparation method of a high-strength wood-plastic composite board comprises the following specific preparation steps:
(1) preparing pre-modified eucalyptus fibers;
(2) preparing sucrose polyester;
(3) preparing a modified solution;
(4) preparing modified eucalyptus fibers;
(5) and (3) preparing the high-strength wood-plastic composite board.
A preparation method of a high-strength wood-plastic composite board comprises the following specific preparation steps:
(1) preparing pre-modified eucalyptus fibers:
mixing eucalyptus powder and a sodium hydroxide solution with the mass fraction of 5%, placing the mixture into a high-temperature reaction kettle, cooking at high temperature, and filtering and separating to obtain filter residue after the high-temperature cooking is finished;
mixing the obtained filter residue with 35% by mass of ethanol solution and phenol, putting into a reaction kettle, adding ammonia water into the reaction kettle, heating, stirring for reaction, filtering, and separating to obtain reaction filter residue, namely the pre-modified eucalyptus fiber for later use;
(2) preparation of sucrose polyester:
mixing sucrose, potassium oleate, potassium carbonate and methyl oleate, placing the mixture into a three-neck flask, heating, keeping the temperature, reacting, taking out the reactant, standing, layering, and separating to obtain an upper-layer oily substance, namely sucrose polyester;
(3) preparing a modified solution:
mixing the obtained sucrose polyester, sodium silicate and citric acid, adding into deionized water, and dispersing by an ultrasonic disperser to obtain a modified solution;
(4) preparing modified eucalyptus fibers:
mixing the pre-modified eucalyptus fiber to be used with the modified liquid, putting the mixture into a reaction kettle, heating, starting a stirrer, stirring for reaction, filtering after the reaction is finished, and separating to obtain a filter cake, namely the modified eucalyptus fiber;
(5) preparing the high-strength wood-plastic composite board:
weighing modified eucalyptus fibers, polypropylene, polyvinyl alcohol, montmorillonite and sodium dodecyl sulfate, sequentially loading into a torque rheometer, and mixing to obtain a wood-plastic mixture;
and injecting the obtained wood-plastic mixture into a stainless steel mold coated with liquid paraffin in advance, adjusting the hot pressing temperature of a flat vulcanizing machine, naturally cooling and solidifying after hot pressing, and removing the mold to obtain the high-strength wood-plastic composite board.
A preparation method of a high-strength wood-plastic composite board comprises the following specific preparation steps:
(1) preparing pre-modified eucalyptus fibers:
mixing eucalyptus powder and a sodium hydroxide solution with the mass fraction of 5% according to the mass ratio of 1:15, putting the mixture into a high-temperature reaction kettle, steaming at high temperature, and filtering and separating to obtain filter residue after the high-temperature steaming is finished;
mixing the obtained filter residue with 35% by mass of ethanol solution and phenol according to the mass ratio of 4:48:1, putting the mixture into a reaction kettle, adding ammonia water with the mass fraction of 20% and the mass fraction of 6-8% by mass of phenol into the reaction kettle, heating to 85-95 ℃, stirring for reaction for 4-5 hours, filtering, and separating to obtain reaction filter residue, namely pre-modified eucalyptus fibers for later use;
(2) preparation of sucrose polyester:
mixing sucrose, potassium oleate, potassium carbonate and methyl oleate, placing the mixture into a three-neck flask, heating the mixture to 148-155 ℃, keeping the temperature for reaction for 3-5 h, taking out the reactant, standing and layering the mixture for 24-30 h, and separating the mixture to obtain an upper-layer oily substance, namely sucrose polyester;
(3) preparing a modified solution:
mixing the obtained sucrose polyester, sodium silicate and citric acid, adding the mixture into deionized water with the total mass of 8-10 times of that of the sucrose polyester, sodium silicate and citric acid, and dispersing the mixture for 20-30 min at the temperature of 60-70 ℃ by using an ultrasonic disperser to obtain a modified solution;
(4) preparing modified eucalyptus fibers:
mixing the pre-modified eucalyptus fibers and the modifying liquid according to the mass ratio of 1:10, putting the mixture into a reaction kettle, heating, starting a stirrer, stirring and reacting at the rotating speed of 80-100 r/min for 1-2 h, filtering after the reaction is finished, and separating to obtain a filter cake, namely the modified eucalyptus fibers;
(5) preparing the high-strength wood-plastic composite board:
weighing 50-60 parts by weight of the modified eucalyptus fibers, 30-40 parts by weight of polypropylene, 10-15 parts by weight of polyvinyl alcohol, 2-3 parts by weight of montmorillonite and 3-4 parts by weight of sodium dodecyl sulfate, sequentially loading into a torque rheometer, and mixing for 20-30 min at 180-200 ℃ to obtain a wood-plastic mixture;
and (3) injecting the obtained wood-plastic mixture into a stainless steel mold coated with liquid paraffin in advance, adjusting the hot pressing temperature of a flat vulcanizing machine, carrying out hot pressing for 15-20 min, naturally cooling and solidifying, and removing the mold to obtain the high-strength wood-plastic composite board.
In the preparation step of the pre-modified eucalyptus fiber in the preferred scheme, the high-temperature cooking temperature is 180-190 ℃, and the high-temperature cooking time is 4-6 hours.
In the preparation step of the sucrose polyester, the mass ratio of sucrose to potassium oleate, potassium carbonate and methyl oleate is 5:1:1: 43.
In the preparation step of the modified solution in the preferred scheme, the mass ratio of sucrose polyester, sodium silicate and citric acid is 10: 2: 1.
in the preparation step of the modified eucalyptus fiber in the preferred scheme, the heating temperature is 160-180 ℃.
In the preparation step of the high-strength wood-plastic composite board with the preferred scheme, the hot pressing temperature of a flat vulcanizing machine is 160-170 ℃, and the hot pressing pressure is 5-8 MPa.
The beneficial technical effects of the invention are as follows:
the invention firstly takes eucalyptus powder as a raw material, the eucalyptus powder is mixed with alkali liquor for alkali boiling, then filter residue after the alkali boiling reacts with phenol under the action of ammonia water to obtain pre-modified eucalyptus fiber, then the invention utilizes cane sugar, potassium oleate, potassium carbonate and methyl oleate to prepare cane sugar polyester, sodium silicate and citric acid to prepare modified liquid, the pre-modified eucalyptus fiber and the modified liquid are mixed and then react at high temperature to obtain modified eucalyptus fiber, finally the modified eucalyptus fiber, polypropylene and other auxiliary materials are blended, hot pressing and drying are carried out to prepare the high-strength wood plastic composite board, the invention firstly takes eucalyptus powder with higher hemicellulose content as the raw material, organic acid is separated from hemicellulose through the hydrothermal action of high-temperature alkali boiling, the organic acid further promotes cellulose hydrolysis, furfural is produced due to hydrolysis, and then furfural and phenol are polymerized under the action of ammonia water to generate furfural resin, the invention also discloses a preparation method of the wood-plastic composite board, which comprises the steps of resinifying the eucalyptus fibers, improving the compatibility between the resinified eucalyptus fibers and a plastic matrix, effectively improving the mechanical strength of the wood-plastic composite board, preparing sucrose polyester, mixing and reacting the sucrose polyester with sodium silicate and citric acid to prepare a modification solution, when the pre-modified eucalyptus fibers are modified by the modification solution, reacting the sodium silicate and the citric acid at high temperature to generate silica sol to be filled in pores of the me-wood fibers, increasing the compactness of the eucalyptus fibers, simultaneously improving the mechanical strength of the nano-silica of the silica sol, further improving the mechanical strength of the eucalyptus fibers by filling the nano-silica, further improving the mechanical strength of the prepared wood-plastic composite board, and in addition, the sucrose polyester also contains the sucrose polyester, can form an adsorption film on the surface of the eucalyptus fibers, reducing the surface energy of the eucalyptus fibers and reducing the polarity, therefore, the compatibility between the eucalyptus fibers and the polymer plastic is improved, the cohesion of the wood-plastic composite board is improved under the gluing effect of the polyvinyl alcohol, the mechanical strength of the wood-plastic composite board is further improved, and the wood-plastic composite board has a wide application prospect.
Detailed Description
Preparing pre-modified eucalyptus fibers:
mixing eucalyptus powder and a sodium hydroxide solution with the mass fraction of 5% according to the mass ratio of 1:15, putting the mixture into a high-temperature reaction kettle, cooking the mixture at the high temperature of 180-190 ℃ for 4-6 hours, and filtering and separating the mixture after the high-temperature cooking is finished to obtain filter residues;
mixing the obtained filter residue with 35% by mass of ethanol solution and phenol according to the mass ratio of 4:48:1, putting the mixture into a reaction kettle, adding ammonia water with the mass fraction of 20% and the mass fraction of 6-8% by mass of phenol into the reaction kettle, heating to 85-95 ℃, stirring for reaction for 4-5 hours, filtering, and separating to obtain reaction filter residue, namely pre-modified eucalyptus fibers for later use;
preparation of sucrose polyester:
mixing sucrose, potassium oleate, potassium carbonate and methyl oleate according to the mass ratio of 5:1:1:43, placing the mixture into a three-neck flask, heating to 148-155 ℃, keeping the temperature for reaction for 3-5 hours, taking out the reactant, standing for layering for 24-30 hours, and separating to obtain an upper-layer oily substance, namely sucrose polyester;
preparing a modified solution:
the obtained sucrose polyester, sodium silicate and citric acid are mixed according to the mass ratio of 10: 2: 1, mixing, adding the mixture into deionized water which is 8-10 times of the total mass of the three, and dispersing for 20-30 min at 60-70 ℃ by using an ultrasonic disperser to obtain a modified solution;
preparing modified eucalyptus fibers:
mixing the pre-modified eucalyptus fibers for later use with the modifying liquid according to the mass ratio of 1:10, putting the mixture into a reaction kettle, heating the mixture to 160-180 ℃, starting a stirrer, stirring the mixture at a rotating speed of 80-100 r/min for reaction for 1-2 hours, filtering the mixture after the reaction is finished, and separating to obtain a filter cake, namely the modified eucalyptus fibers;
preparing the high-strength wood-plastic composite board:
weighing 50-60 parts by weight of the modified eucalyptus fibers, 30-40 parts by weight of polypropylene, 10-15 parts by weight of polyvinyl alcohol, 2-3 parts by weight of montmorillonite and 3-4 parts by weight of sodium dodecyl sulfate, sequentially loading into a torque rheometer, and mixing for 20-30 min at 180-200 ℃ to obtain a wood-plastic mixture;
and injecting the obtained wood-plastic mixture into a stainless steel mold coated with liquid paraffin in advance, adjusting the hot pressing temperature of a flat vulcanizing machine to 160-170 ℃, carrying out hot pressing for 15-20 min at the pressure of 5-8 MPa, naturally cooling and solidifying, and removing the mold to obtain the high-strength wood-plastic composite board.
Example 1
(1) Preparing pre-modified eucalyptus fibers:
mixing eucalyptus powder and a sodium hydroxide solution with the mass fraction of 5% according to the mass ratio of 1:15, putting the mixture into a high-temperature reaction kettle, cooking the mixture at the high temperature of 180 ℃ for 4 hours, and filtering and separating the mixture after the high-temperature cooking is finished to obtain filter residue;
mixing the obtained filter residue with 35% of ethanol solution and phenol according to the mass ratio of 4:48:1, putting the mixture into a reaction kettle, adding ammonia water with the mass fraction of 20% and the mass fraction of 6% of phenol into the reaction kettle, heating to 85 ℃, stirring for reaction for 4 hours, filtering, and separating to obtain reaction filter residue, namely the pre-modified eucalyptus fiber for later use;
preparation of sucrose polyester:
mixing sucrose, potassium oleate, potassium carbonate and methyl oleate according to the mass ratio of 5:1:1:43, placing the mixture into a three-neck flask, heating the mixture to 148 ℃, keeping the temperature for reaction for 3 hours, taking out the reactant, standing and layering the mixture for 24 hours, and separating the mixture to obtain an upper-layer oily substance, namely sucrose polyester;
preparing a modified solution:
the obtained sucrose polyester, sodium silicate and citric acid are mixed according to the mass ratio of 10: 2: 1, adding the mixture into deionized water which is 8 times of the total mass of the three, and dispersing the mixture for 20min at 60 ℃ by an ultrasonic disperser to obtain a modified solution;
preparing modified eucalyptus fibers:
mixing the pre-modified eucalyptus fibers and the modifying liquid according to the mass ratio of 1:10, putting into a reaction kettle, heating to 160 ℃, starting a stirrer, stirring at a rotating speed of 80r/min for reaction for 1 hour, filtering after the reaction is finished, and separating to obtain a filter cake, namely the modified eucalyptus fibers;
preparing the high-strength wood-plastic composite board:
weighing 50 parts of the modified eucalyptus fiber, 30 parts of polypropylene, 10 parts of polyvinyl alcohol, 2 parts of montmorillonite and 3 parts of sodium dodecyl sulfate, sequentially loading into a torque rheometer, and mixing for 20min at 180 ℃ to obtain a wood-plastic mixture;
and (3) injecting the obtained wood-plastic mixture into a stainless steel mold coated with liquid paraffin in advance, adjusting the hot pressing temperature of a flat vulcanizing machine to 160 ℃, carrying out hot pressing for 15min at the pressure of 5MPa, naturally cooling and solidifying, and removing the mold to obtain the high-strength wood-plastic composite board.
Example 2
(1) Preparing pre-modified eucalyptus fibers:
mixing eucalyptus powder and a sodium hydroxide solution with the mass fraction of 5% according to the mass ratio of 1:15, putting the mixture into a high-temperature reaction kettle, steaming and boiling the mixture at 185 ℃ for 5 hours, and filtering and separating the mixture after the high-temperature steaming and boiling is finished to obtain filter residue;
mixing the obtained filter residue with 35% of ethanol solution and phenol according to the mass ratio of 4:48:1, putting the mixture into a reaction kettle, adding ammonia water with the mass fraction of 20% and the mass fraction of 7% of phenol into the reaction kettle, heating to 90 ℃, stirring for reaction for 5 hours, filtering, and separating to obtain reaction filter residue, namely the pre-modified eucalyptus fiber for later use;
preparation of sucrose polyester:
mixing sucrose, potassium oleate, potassium carbonate and methyl oleate according to the mass ratio of 5:1:1:43, placing the mixture into a three-neck flask, heating to 152 ℃, keeping the temperature for reaction for 4 hours, taking out the reactant, standing for layering for 26 hours, and separating to obtain an upper-layer oily substance, namely sucrose polyester;
preparing a modified solution:
the obtained sucrose polyester, sodium silicate and citric acid are mixed according to the mass ratio of 10: 2: 1, adding the mixture into deionized water 9 times of the total mass of the three, and dispersing the mixture for 25min at 65 ℃ by an ultrasonic disperser to obtain a modified solution;
preparing modified eucalyptus fibers:
mixing the pre-modified eucalyptus fibers and the modifying liquid according to the mass ratio of 1:10, putting into a reaction kettle, heating to 170 ℃, starting a stirrer, stirring at a rotating speed of 90r/min for reaction for 2 hours, filtering after the reaction is finished, and separating to obtain a filter cake, namely the modified eucalyptus fibers;
preparing the high-strength wood-plastic composite board:
weighing 55 parts by weight of the modified eucalyptus fibers, 35 parts by weight of polypropylene, 13 parts by weight of polyvinyl alcohol, 2 parts by weight of montmorillonite and 3 parts by weight of sodium dodecyl sulfate, sequentially loading the materials into a torque rheometer, and mixing the materials for 25min at 190 ℃ to obtain a wood-plastic mixture;
and (3) injecting the obtained wood-plastic mixture into a stainless steel mold coated with liquid paraffin in advance, adjusting the hot pressing temperature of a flat vulcanizing machine to 165 ℃, carrying out hot pressing for 18min at the pressure of 7MPa, naturally cooling and solidifying, and removing the mold to obtain the high-strength wood-plastic composite board.
Example 3
(1) Preparing pre-modified eucalyptus fibers:
mixing eucalyptus powder and a sodium hydroxide solution with the mass fraction of 5% according to the mass ratio of 1:15, putting the mixture into a high-temperature reaction kettle, cooking the mixture at the high temperature of 190 ℃ for 6 hours, and filtering and separating the mixture after the high-temperature cooking is finished to obtain filter residue;
mixing the obtained filter residue with 35% of ethanol solution and phenol according to the mass ratio of 4:48:1, putting the mixture into a reaction kettle, adding ammonia water with the mass fraction of 20% and the mass fraction of 8% of phenol into the reaction kettle, heating to 95 ℃, stirring for reaction for 5 hours, filtering, and separating to obtain reaction filter residue, namely the pre-modified eucalyptus fiber for later use;
preparation of sucrose polyester:
mixing sucrose, potassium oleate, potassium carbonate and methyl oleate according to the mass ratio of 5:1:1:43, placing the mixture into a three-neck flask, heating to 155 ℃, keeping the temperature for 5 hours for reaction, taking out the reactant, standing for layering for 30 hours, and separating to obtain an upper-layer oily substance, namely sucrose polyester;
preparing a modified solution:
the obtained sucrose polyester, sodium silicate and citric acid are mixed according to the mass ratio of 10: 2: 1, adding the mixture into deionized water which is 10 times of the total mass of the three, and dispersing the mixture for 30min at 70 ℃ by an ultrasonic disperser to obtain a modified solution;
preparing modified eucalyptus fibers:
mixing the pre-modified eucalyptus fibers and the modifying liquid according to the mass ratio of 1:10, putting into a reaction kettle, heating to 180 ℃, starting a stirrer, stirring at a rotating speed of 100r/min for reaction for 2 hours, filtering after the reaction is finished, and separating to obtain a filter cake, namely the modified eucalyptus fibers;
preparing the high-strength wood-plastic composite board:
weighing 60 parts of the modified eucalyptus fiber, 40 parts of polypropylene, 15 parts of polyvinyl alcohol, 3 parts of montmorillonite and 4 parts of sodium dodecyl sulfate in parts by weight, sequentially loading into a torque rheometer, and mixing for 30min at 200 ℃ to obtain a wood-plastic mixture;
and (3) injecting the obtained wood-plastic mixture into a stainless steel mold coated with liquid paraffin in advance, adjusting the hot pressing temperature of a flat vulcanizing machine to 170 ℃, carrying out hot pressing for 20min at the pressure of 8MPa, naturally cooling and solidifying, and removing the mold to obtain the high-strength wood-plastic composite board.
Comparative example 1: the preparation method is basically the same as that of the example 1 of the invention, the only difference is that the common eucalyptus fiber is used for replacing the pre-modified eucalyptus fiber of the invention, and other preparation steps are not changed;
comparative example 2: the preparation method is basically the same as that of the example 1 of the invention, except that the pre-modified eucalyptus fibers are not modified by the modifying liquid of the invention, and other preparation steps are not changed;
the performance of the wood-plastic composite board prepared by the invention and the performance of the wood-plastic composite board in the comparative example are respectively detected, and the detection results are shown in table 1:
the detection method comprises the following steps:
the impact strength test adopts a drop hammer method to detect;
the hardness test is expressed in terms of the hardness of a pencil.
The tensile strength and the bending strength are detected by a universal mechanical testing machine;
TABLE 1 Performance test results
| Detecting items | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 |
| Impact Strength (N. m) | 48.5 | 52.4 | 55.2 | 38.2 | 38.5 |
| Pencil hardness (H) | 4 | 5 | 5 | 2 | 3 |
| Tensile Strength (MPa) | 55 | 58 | 59 | 48 | 49 |
| Bending strength (MPa) | 85 | 86 | 88 | 78 | 80 |
As can be seen from the detection data in the table above, the comparative example 1 of the invention does not use the pre-modified eucalyptus fiber, so the mechanical strength of the prepared wood-plastic composite board is reduced, and the comparative example 2 does not use the modifying liquid for modification, so the mechanical strength of the prepared wood-plastic composite board is also reduced.
Claims (10)
1. The high-strength wood-plastic composite board is characterized in that: the high-strength wood-plastic composite board comprises: modified eucalyptus fibers, polypropylene, polyvinyl alcohol, montmorillonite and sodium dodecyl sulfate.
2. The high-strength wood-plastic composite board according to claim 1, wherein: the high-strength wood-plastic composite board comprises the following components in parts by weight: 50-60 parts of modified eucalyptus fibers, 30-40 parts of polypropylene, 10-15 parts of polyvinyl alcohol, 2-3 parts of montmorillonite and 3-4 parts of sodium dodecyl sulfate.
3. A preparation method of a high-strength wood-plastic composite board is characterized by comprising the following specific preparation steps:
(1) preparing pre-modified eucalyptus fibers;
(2) preparing sucrose polyester;
(3) preparing a modified solution;
(4) preparing modified eucalyptus fibers;
(5) and (3) preparing the high-strength wood-plastic composite board.
4. The preparation method of the high-strength wood-plastic composite board according to claim 3, which is characterized by comprising the following specific preparation steps:
(1) preparing pre-modified eucalyptus fibers:
mixing eucalyptus powder and a sodium hydroxide solution with the mass fraction of 5%, placing the mixture into a high-temperature reaction kettle, cooking at high temperature, and filtering and separating to obtain filter residue after the high-temperature cooking is finished;
mixing the obtained filter residue with 35% by mass of ethanol solution and phenol, putting into a reaction kettle, adding ammonia water into the reaction kettle, heating, stirring for reaction, filtering, and separating to obtain reaction filter residue, namely the pre-modified eucalyptus fiber for later use;
(2) preparation of sucrose polyester:
mixing sucrose, potassium oleate, potassium carbonate and methyl oleate, placing the mixture into a three-neck flask, heating, keeping the temperature, reacting, taking out the reactant, standing, layering, and separating to obtain an upper-layer oily substance, namely sucrose polyester;
(3) preparing a modified solution:
mixing the obtained sucrose polyester, sodium silicate and citric acid, adding into deionized water, and dispersing by an ultrasonic disperser to obtain a modified solution;
(4) preparing modified eucalyptus fibers:
mixing the pre-modified eucalyptus fiber to be used with the modified liquid, putting the mixture into a reaction kettle, heating, starting a stirrer, stirring for reaction, filtering after the reaction is finished, and separating to obtain a filter cake, namely the modified eucalyptus fiber;
(5) preparing the high-strength wood-plastic composite board:
weighing modified eucalyptus fibers, polypropylene, polyvinyl alcohol, montmorillonite and sodium dodecyl sulfate, sequentially loading into a torque rheometer, and mixing to obtain a wood-plastic mixture;
and injecting the obtained wood-plastic mixture into a stainless steel mold coated with liquid paraffin in advance, adjusting the hot pressing temperature of a flat vulcanizing machine, naturally cooling and solidifying after hot pressing, and removing the mold to obtain the high-strength wood-plastic composite board.
5. The preparation method of the high-strength wood-plastic composite board according to claim 4, which is characterized by comprising the following specific preparation steps:
(1) preparing pre-modified eucalyptus fibers:
mixing eucalyptus powder and a sodium hydroxide solution with the mass fraction of 5% according to the mass ratio of 1:15, putting the mixture into a high-temperature reaction kettle, steaming at high temperature, and filtering and separating to obtain filter residue after the high-temperature steaming is finished;
mixing the obtained filter residue with 35% by mass of ethanol solution and phenol according to the mass ratio of 4:48:1, putting the mixture into a reaction kettle, adding ammonia water with the mass fraction of 20% and the mass fraction of 6-8% by mass of phenol into the reaction kettle, heating to 85-95 ℃, stirring for reaction for 4-5 hours, filtering, and separating to obtain reaction filter residue, namely pre-modified eucalyptus fibers for later use;
(2) preparation of sucrose polyester:
mixing sucrose, potassium oleate, potassium carbonate and methyl oleate, placing the mixture into a three-neck flask, heating the mixture to 148-155 ℃, keeping the temperature for reaction for 3-5 h, taking out the reactant, standing and layering the mixture for 24-30 h, and separating the mixture to obtain an upper-layer oily substance, namely sucrose polyester;
(3) preparing a modified solution:
mixing the obtained sucrose polyester, sodium silicate and citric acid, adding the mixture into deionized water with the total mass of 8-10 times of that of the sucrose polyester, sodium silicate and citric acid, and dispersing the mixture for 20-30 min at the temperature of 60-70 ℃ by using an ultrasonic disperser to obtain a modified solution;
(4) preparing modified eucalyptus fibers:
mixing the pre-modified eucalyptus fibers and the modifying liquid according to the mass ratio of 1:10, putting the mixture into a reaction kettle, heating, starting a stirrer, stirring and reacting at the rotating speed of 80-100 r/min for 1-2 h, filtering after the reaction is finished, and separating to obtain a filter cake, namely the modified eucalyptus fibers;
(5) preparing the high-strength wood-plastic composite board:
weighing 50-60 parts by weight of the modified eucalyptus fibers, 30-40 parts by weight of polypropylene, 10-15 parts by weight of polyvinyl alcohol, 2-3 parts by weight of montmorillonite and 3-4 parts by weight of sodium dodecyl sulfate, sequentially loading into a torque rheometer, and mixing for 20-30 min at 180-200 ℃ to obtain a wood-plastic mixture;
and (3) injecting the obtained wood-plastic mixture into a stainless steel mold coated with liquid paraffin in advance, adjusting the hot pressing temperature of a flat vulcanizing machine, carrying out hot pressing for 15-20 min, naturally cooling and solidifying, and removing the mold to obtain the high-strength wood-plastic composite board.
6. The method for preparing a high-strength wood-plastic composite board according to claim 4 or 5, wherein the method comprises the following steps: in the preparation step of the pre-modified eucalyptus fiber, the high-temperature cooking temperature is 180-190 ℃, and the high-temperature cooking time is 4-6 hours.
7. The method for preparing a high-strength wood-plastic composite board according to claim 4 or 5, wherein the method comprises the following steps: in the preparation step of the sucrose polyester, the mass ratio of sucrose to potassium oleate, potassium carbonate and methyl oleate is 5:1:1: 43.
8. The method for preparing a high-strength wood-plastic composite board according to claim 4 or 5, wherein the method comprises the following steps: in the preparation step of the modified liquid, the mass ratio of the sucrose polyester to the sodium silicate to the citric acid is 10: 2: 1.
9. the method for preparing a high-strength wood-plastic composite board according to claim 4 or 5, wherein the method comprises the following steps: in the preparation step of the modified eucalyptus fiber, the heating temperature is 160-180 ℃.
10. The method for preparing a high-strength wood-plastic composite board according to claim 4 or 5, wherein the method comprises the following steps: in the preparation step of the high-strength wood-plastic composite board, the hot pressing temperature of a flat vulcanizing machine is 160-170 ℃, and the hot pressing pressure is 5-8 MPa.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111607104A (en) * | 2020-05-25 | 2020-09-01 | 上海中道糖业股份有限公司 | Sucrose with low human body absorption and preparation method thereof |
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