CN112761017B - Method for preparing high-hardness fiberboard with bamboo fiber as raw material - Google Patents
Method for preparing high-hardness fiberboard with bamboo fiber as raw material Download PDFInfo
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- CN112761017B CN112761017B CN202011642132.6A CN202011642132A CN112761017B CN 112761017 B CN112761017 B CN 112761017B CN 202011642132 A CN202011642132 A CN 202011642132A CN 112761017 B CN112761017 B CN 112761017B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a method for preparing a high-hardness fiberboard with bamboo fiber as a raw material, which comprises the following steps: s01: grinding bamboo fiber to a beating degree of 15-20 DEG SR; soaking in anhydrous ethanol for 12h; s02: synthesizing maleic anhydride grafted polyethylene glycol by using polyethylene glycol and maleic anhydride as raw materials; s03: mixing and ball-milling 38-42 parts of ground bamboo fiber, 8-12 parts of maleic anhydride grafted polyethylene glycol, 4-6 parts of nano aluminum oxide, 38-42 parts of thermoplastic resin and 4-6 parts of curing agent, and adjusting the pH value to 7-8; s04: and (3) forming and dehydrating the ball-milled product through a net part, dipping the ball-milled product in a dipping part, removing redundant latex through a squeezer, and drying the ball-milled product at a high temperature through drying equipment. The composite board is uniformly mixed by adopting a ball milling mode, and the nano-alumina is uniformly and fully distributed in the composite board under the ball milling pressure in the coupling process of the thermoplastic resin, the crude bamboo fiber and the maleic anhydride grafted polyethylene glycol, so that the hardness of the whole composite board is improved.
Description
Technical Field
The invention relates to the field of bamboo fiber composite boards, in particular to a method for preparing a high-hardness fiberboard with bamboo fibers as raw materials.
Background
Bamboo plants have many excellent properties: high growth speed, high yield, early yield and wide application. Compared with wood, bamboo has the advantages of high strength, high hardness, good toughness, etc., and can be used as engineering structural material. Under the conditions of short wood supply and increasingly reduced forest resources in China at present, the research on the bamboo conforming material preparation process has important significance for fully utilizing the advantages of bamboo resources in China, reducing the contradiction between wood supply and demand, improving the bamboo plastic conforming material preparation process level and improving the ecological environment.
The natural bamboo fiber has the characteristics of low price, high specific modulus, high specific strength and the like, can be naturally degraded, and belongs to renewable resources. With the increasing awareness of environmental protection in recent years, a composite material prepared from bamboo fibers and thermoplastic resin is widely used in the fields of automotive upholsteries, building parts and interior decoration. Compared with the traditional materials such as glass fiber reinforced materials, the bamboo fiber reinforced thermoplastic composite material has the advantages of wide source, environmental protection, energy conservation, degradability and no pollution to the environment, thereby becoming a hot point for development in the field of composite materials.
However, the existing bamboo fiber composite material is compounded by thermoplastic resin and bamboo fiber, has low hardness, and is particularly suitable for indoor decoration, and unrecoverable scratches are easy to generate; when the scratch appears in the interior decoration position, the repair can not be carried out and the aesthetic property of decoration is affected. Therefore, how to prepare a bamboo fiber composite material which is used for indoor decoration and has high hardness becomes a problem to be solved urgently in the field of decoration.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for preparing a high-hardness fiberboard by using bamboo fiber as a raw material.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for preparing a high-hardness fiberboard with bamboo fiber as a raw material comprises the following steps:
s01: grinding bamboo fiber to a beating degree of 15-20 DEG SR; soaking in anhydrous ethanol for 12h;
s02: synthesizing maleic anhydride grafted polyethylene glycol by using polyethylene glycol and maleic anhydride as raw materials;
s03: mixing and ball-milling 38-42 parts of ground bamboo fiber, 8-12 parts of maleic anhydride grafted polyethylene glycol, 4-6 parts of nano aluminum oxide, 38-42 parts of thermoplastic resin and 4-6 parts of curing agent, and adjusting the pH value to 7-8;
s04: and (3) forming and dehydrating the ball-milled product through a net part, dipping the ball-milled product in a dipping part, removing redundant latex through a squeezer, drying the ball-milled product at a high temperature of 95-150 ℃ through drying equipment, and performing surface finishing, printing and plate cutting to obtain the high-hardness fiberboard.
Further, the thermoplastic resin is phenolic resin or polypropylene resin.
Further, in the step S01, the bamboo is cut and sawed, sliced, crushed, filtered and dried to obtain rough bamboo fibers, and then the rough bamboo fibers are ground into the SR with the beating degree of 15-20 degrees.
Further, the latex is hydroxy styrene-butadiene latex.
Further, the curing agent is ethylenediamine or diethylenetriamine.
Further, in the step S02, a thermal catalysis method is adopted to synthesize the maleic anhydride grafted polyethylene glycol.
Further, in the step S03, 40 parts of the bamboo fiber after pulp grinding, 10 parts of maleic anhydride grafted polyethylene glycol, 5 parts of nano alumina, 40 parts of thermoplastic resin and 5 parts of a curing agent are mixed and ball-milled, and the pH is adjusted to 8.
Furthermore, the particle size of the nano-alumina is 15-25nm.
The invention has the beneficial effects that: the maleic anhydride in the maleic anhydride grafted polyethylene glycol can be subjected to esterification reaction with carboxyl in bamboo fiber, and in a two-phase interface, the maleic anhydride grafted polyethylene glycol can be simultaneously combined with the bamboo fiber and the thermoplastic resin through chemical bonds and hydrogen bonds to play a coupling role, so that the bonding strength of the two-phase interface is improved; meanwhile, in the ball milling reaction process of each component, the moisture in the bamboo fiber can be consumed, so that the moisture content of the final composite board is kept at a lower level;
the composite board is uniformly mixed by adopting a ball milling mode, and the nano-alumina is uniformly and fully distributed in the composite board under the ball milling pressure in the coupling process of the thermoplastic resin, the rough bamboo fiber and the maleic anhydride grafted polyethylene glycol, so that the hardness of the whole composite board is improved;
the ball-milling product is kept alkaline, pectin, lignin, hemicellulose and other low-molecular low impurities in the bamboo fiber are dissolved and removed through alkali treatment, and the rotating angle of the microfiber is reduced, so that the fiber performance is improved; meanwhile, the nano aluminum oxide is beneficial to keeping a stable state in the composite board.
Detailed Description
The invention will be further described with reference to specific embodiments:
the maleic anhydride in the maleic anhydride grafted polyethylene glycol can generate esterification reaction with carboxyl in the bamboo fiber, and in a two-phase interface, the maleic anhydride grafted polyethylene glycol can simultaneously generate chemical bond and hydrogen bond combination with the bamboo fiber and the thermoplastic resin to play a coupling role, so that the bonding strength of the two-phase interface is improved. The maleic anhydride grafted polyethylene glycol is prepared by using polyethylene glycol and maleic anhydride as raw materials and synthesizing the maleic anhydride grafted polyethylene glycol by a thermal catalysis method; the polyethylene glycol is added into a reactor after being purified, heated to a certain temperature to be in a molten state, the reactant is stirred, 0.2% of composite catalyst is added, then a certain amount of maleic anhydride is added, after refluxing for 4 hours, dry air is introduced, bubbling is carried out for a certain time, unreacted maleic anhydride is discharged, a reaction product, namely maleic anhydride grafted polyethylene glycol, is turned out from the reactor, becomes a carboxylated polyether interface modifier, and is in a wax shape at room temperature. The composite catalyst of the invention can be any kind of composite catalyst in the prior art.
In the ball milling reaction process of each component, the moisture in the bamboo fiber can be consumed, so that the water content of the final composite board is kept at a lower level; the service life of the bamboo fiber composite board is prolonged.
The composite board is uniformly mixed by adopting a ball milling mode, and the nano-alumina is uniformly and fully distributed in the composite board under the ball milling pressure in the coupling process of the thermoplastic resin, the rough bamboo fiber and the maleic anhydride grafted polyethylene glycol, so that the hardness of the whole composite board is improved;
the ball-milling product is kept alkaline, pectin, lignin, hemicellulose and other low-molecular low impurities in the bamboo fiber are dissolved and removed through alkali treatment, and the rotating angle of the microfiber is reduced, so that the fiber performance is improved; meanwhile, the nano aluminum oxide is beneficial to maintaining a stable state in the composite board.
The raw materials in the invention are conventional raw materials which can be bought in the market, for example, the nano alumina powder adopts nano alumina of MG-AlOO1Y model of Shanghai ink high-tech limited company; the phenolic resin is phenolic resin of Yuta 203 model of Jingnan resin Co., jinghai county, tianjin; the polypropylene resin is the rainbow CK-300 model polypropylene resin of Shenzhen hongyu packaging material Limited.
Example 1
A method for preparing a high-hardness fiberboard taking bamboo fiber as a raw material comprises the following steps:
s01: firstly, cutting a bamboo, slicing, crushing, filtering and drying to obtain rough bamboo fibers, and then grinding the rough bamboo fibers to a beating degree of 15-20 DEG SR; soaking in anhydrous ethanol for 12h;
s02: synthesizing maleic anhydride grafted polyethylene glycol by using polyethylene glycol and maleic anhydride as raw materials;
s03: mixing and ball-milling 42kg of ground bamboo fiber, 12kg of maleic anhydride grafted polyethylene glycol, 4kg of nano-alumina, 38kg of phenolic resin and 4kg of ethylenediamine, and adjusting the pH value to 8;
s04: molding and dehydrating the ball-milled product through a net part, dipping the ball-milled product in a dipping part, removing redundant latex through a squeezer, drying the ball-milled product at a high temperature of 95 ℃ through drying equipment, and performing surface finishing, printing and plate cutting to obtain a high-hardness fiberboard; wherein the gum dipping part is filled with latex which is hydroxy butylbenzene latex.
Example 2
A method for preparing a high-hardness fiberboard taking bamboo fiber as a raw material comprises the following steps:
s01: firstly, cutting a bamboo, slicing, crushing, filtering and drying to obtain rough bamboo fibers, and then grinding the rough bamboo fibers to a beating degree of 15-20 DEG SR; soaking in anhydrous ethanol for 12h;
s02: synthesizing maleic anhydride grafted polyethylene glycol by using polyethylene glycol and maleic anhydride as raw materials;
s03: mixing and ball-milling 8kg of ground bamboo fiber, 8kg of maleic anhydride grafted polyethylene glycol, 6kg of nano-alumina, 42kg of polypropylene resin and 6kg of diethylenetriamine, and adjusting the pH value to 7;
s04: molding and dehydrating the ball-milled product through a net part, dipping the ball-milled product in a dipping part, removing redundant latex through a squeezer, drying the ball-milled product at a high temperature of 150 ℃ through drying equipment, and performing surface finishing, printing and plate cutting to obtain a high-hardness fiberboard; wherein the gum dipping part is filled with latex which is hydroxy butylbenzene latex.
Example 3
A method for preparing a high-hardness fiberboard with bamboo fiber as a raw material comprises the following steps:
s01: firstly, cutting a bamboo, slicing, crushing, filtering and drying to obtain rough bamboo fibers, and then grinding the rough bamboo fibers to a beating degree of 15-20 DEG SR; soaking in anhydrous ethanol for 12h;
s02: synthesizing maleic anhydride grafted polyethylene glycol by using polyethylene glycol and maleic anhydride as raw materials;
s03: mixing and ball-milling 40kg of ground bamboo fiber, 10kg of maleic anhydride grafted polyethylene glycol, 5kg of nano-alumina, 40kg of phenolic resin and 5kg of diethylenetriamine, and adjusting the pH value to 8;
s04: molding and dehydrating the ball-milled product through a net part, dipping glue in a dipping glue part, removing redundant latex through a squeezer, drying at a high temperature of 95 ℃ through drying equipment, and performing surface finishing, printing and plate cutting to obtain a high-hardness fiberboard; wherein the gum dipping part is filled with latex which is hydroxy butylbenzene latex.
Comparative example 1
In contrast to example 3, maleic anhydride grafted polyethylene glycol was absent in step S03.
Comparative example 2
In contrast to example 3, nano alumina was absent in step S03.
Experimental example 1
The Shore hardness of the bamboo fiber composite boards prepared in examples 1-3 and comparative examples 1-2 is performed according to the requirement of Shore D in GB/T2411-2008. The measurement results are shown in table 1.
Table 1 shore hardness of different bamboo fiber composite boards
| Item | Shore Hardness (HD) |
| Example 1 | 78 |
| Example 2 | 77 |
| Example 3 | 79 |
| Comparative example 1 | 70 |
| Comparative example 2 | 62 |
The hardness of the bamboo fiber composite board prepared by the method is obviously higher than that of the bamboo fiber composite board not containing nano-alumina in the comparative example 2, which shows that the nano-alumina has an obvious effect on improving the hardness of the bamboo fiber composite board; the comparative example 1 lacks maleic anhydride grafted polyethylene glycol, and the hardness of the maleic anhydride grafted polyethylene glycol is between that of the bamboo fiber composite boards in the examples 1-3 and that of the bamboo fiber composite board in the comparative example 2, which shows that the maleic anhydride grafted polyethylene glycol has a certain influence on the hardness of the bamboo fiber composite board, because the maleic anhydride grafted polyethylene glycol can be simultaneously combined with the bamboo fiber and the thermoplastic resin through chemical bonds and hydrogen bonds to play a coupling role, so that the bonding strength of a two-phase interface is improved.
Experimental example 2
Tensile strength and modulus tests of the bamboo fiber composite boards prepared in examples 1-3 and comparative examples 1-2 were carried out according to the standard method in GB/T1447-2005. The measurement results are shown in table 2:
TABLE 2 tensile Strength and tensile modulus of various bamboo fiber composite boards
| Item | Tensile Strength (MPa) | Tensile modulus (MPa) |
| Example 1 | 43 | 4800 |
| Example 2 | 42 | 4830 |
| Example 3 | 45 | 4850 |
| Comparative example 1 | 32 | 3850 |
| Comparative example 2 | 36 | 4200 |
The tensile strength and tensile modulus of the bamboo fiber composite board lacking maleic anhydride grafted polyethylene glycol in the comparative example 1 are obviously lower than those of the bamboo fiber composite boards prepared in the examples 1-3; and is smaller than the bamboo fiber composite board lacking the nano alumina in the comparative example 2; the combination of chemical bonds and hydrogen bonds between the maleic anhydride grafted polyethylene glycol, the bamboo fibers and the thermoplastic resin is shown, and the bonding force between different phases in the bamboo fiber composite board can be enhanced.
Experimental example 3
The moisture content of the bamboo fibre composite boards prepared in examples 1-4 and comparative examples 1-2 was measured according to the requirements of 4.3 in GB/T17657-2013. The measurement results are shown in table 3.
Table 3 moisture content of different bamboo fibre composite boards
The method has the advantages that the water content of the bamboo fiber composite board prepared by the method is lower than that of the comparative proportion, and the different components can consume part of water in the rough bamboo fiber in the ball milling process, so that the water content of the finally formed bamboo fiber composite board is reduced.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (4)
1. A method for preparing a high-hardness fiberboard with bamboo fiber as a raw material is characterized by comprising the following steps:
s01: grinding bamboo fiber to a beating degree of 15-20 DEG SR; soaking in anhydrous ethanol for 12h;
s02: synthesizing maleic anhydride grafted polyethylene glycol by using polyethylene glycol and maleic anhydride as raw materials;
s03: mixing and ball-milling 38-42 parts of ground bamboo fiber, 8-12 parts of maleic anhydride grafted polyethylene glycol, 4-6 parts of nano aluminum oxide, 38-42 parts of thermoplastic resin and 4-6 parts of curing agent, and adjusting the pH value to 8;
s04: molding and dehydrating the ball-milled product through a net part, dipping the ball-milled product in a dipping part, filling latex in the dipping part, removing redundant latex by a squeezer, drying the latex at high temperature of 95-150 ℃ through drying equipment, and performing surface finishing, printing and plate cutting to obtain a high-hardness fiberboard;
the thermoplastic resin is phenolic resin or polypropylene resin;
the latex is hydroxy styrene-butadiene latex;
the curing agent is ethylenediamine or diethylenetriamine;
in the step S02, maleic anhydride grafted polyethylene glycol is synthesized by a thermal catalysis method.
2. The method of claim 1, wherein the step S01 comprises sawing bamboo, cutting into pieces, pulverizing, filtering, drying to obtain crude bamboo fiber, and pulping to a beating degree of 15-20 ° SR.
3. The method for preparing a high-hardness fiberboard of claim 1, wherein in the step S03, 40 parts of the bamboo fiber after being ground, 10 parts of maleic anhydride grafted polyethylene glycol, 5 parts of nano alumina, 40 parts of thermoplastic resin and 5 parts of curing agent are mixed and ball-milled, and the pH is adjusted to 8.
4. The method for preparing a high-hardness fiberboard of claim 1, wherein the nano-alumina has a particle size of 15 to 25nm.
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Citations (7)
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|---|---|---|---|---|
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| JP2012007254A (en) * | 2010-06-23 | 2012-01-12 | Sumitomo Bakelite Co Ltd | Wet papermaking material and fiber-reinforced composite material |
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| CN103849019A (en) * | 2012-12-03 | 2014-06-11 | 合肥杰事杰新材料股份有限公司 | Natural fiber composite board, and manufacturing method and application thereof |
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2020
- 2020-12-31 CN CN202011642132.6A patent/CN112761017B/en active Active
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| CN1651518A (en) * | 2004-12-31 | 2005-08-10 | 张庐陵 | Bamboo fiber, bamboo powder, wood fiber resin base composite material |
| CN101130646A (en) * | 2006-08-22 | 2008-02-27 | 德古萨股份公司 | Dispersion von aluminiumoxid, beschichtungszusammensetzung und tintenaufnehmendes medium |
| JP2012007254A (en) * | 2010-06-23 | 2012-01-12 | Sumitomo Bakelite Co Ltd | Wet papermaking material and fiber-reinforced composite material |
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| CN103937151A (en) * | 2014-04-20 | 2014-07-23 | 桂林电器科学研究院有限公司 | Preparation method of cotton-fiber-reinforced injection-type phenol aldehyde molding compound |
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