CN109773936A - A kind of straw board and preparation method thereof and the method for adjusting hardness - Google Patents
A kind of straw board and preparation method thereof and the method for adjusting hardness Download PDFInfo
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Abstract
The present invention relates to plate manufacturing technology fields, more particularly, to a kind of straw board and preparation method thereof and the method for adjusting hardness.The preparation method of straw board includes the following steps: to crush stalk, after washing, being dehydrated, carries out ultrasonication, after dry, mixes, pressing plate molding with sizing material, obtains straw board；The condition of ultrasonication includes: that the power of ultrasound is 50-300kW, and ultrasonic frequency is 20-50kHz, and the ultrasonic time is 20-80min；Dehydration makes the mass dryness fraction 20-30% of stalk.By carrying out ultrasonication to stalk, the wax coat on stalk surface is handled using the fuel factor and cavitation effect of ultrasonic wave, smooth stalk surface is set to form obvious gully form, improve the roughness on surface, the sizing materials such as cheap air aldehyde resin can be immersed inside stalk by coarse surface, infiltration, diffusion, the infiltration of matrix resin etc. for promoting sizing material, obtain the straw board of function admirable.
Description
Technical field
The present invention relates to plate manufacturing technology fields, more particularly, to a kind of straw board and preparation method thereof and adjust soft
The method of hardness.
Background technique
China is large agricultural country, there is an agricultural straw resources such as straw abundant, wheat straw, annual about 500,000,000 tons.For a long time
Since, due to not good processing and utilization, causes peasant as waste, the mode of burning and discarding is taken to handle,
Cause the significant wastage of more serious environmental pollution and fibre resources.
In the prior art, scientific research personnel is made that certain trial, but agriculture in terms of using crop straws for producing plate
The glue performance of crop material is poor, and common matrix resin is difficult to immerse inside stalk, influence the wet of matrix resin, diffusion,
Infiltration etc., it is difficult to produce qualified plate.In order to improve the performance of straw board, need using expensive isocyanates
Class adhesive improves bonding strength, considerably increases production cost.
In view of this, the present invention is specifically proposed.
Summary of the invention
The first object of the present invention is to provide a kind of preparation method of straw board, existing in the prior art to solve
The technical issues of plate property is undesirable and high production cost.
The second object of the present invention is to provide a kind of straw board, and the glue performance of stalk is excellent in straw board, promotees
Into the wet of matrix resin, diffusion and infiltration etc., the performance of straw board is improved.
The third object of the present invention is to provide a kind of preparation method adjusting plate hardness using above-mentioned straw board
Method obtain the straw board of different soft and hard degree by adjusting specific parameter, meet different use demands.
In order to realize above-mentioned purpose of the invention, the following technical scheme is adopted:
A kind of preparation method of straw board, includes the following steps:
Stalk is crushed, after washing, being dehydrated, carries out ultrasonication, after dry, mixes, pressing plate molding, obtains with sizing material
Straw board；
The condition of ultrasonication includes: that the power of ultrasound is 50-300kW, and ultrasonic frequency is 20-50kHz, ultrasonic
Time is 20-80min；
Dehydration makes the mass dryness fraction 20-30% of stalk.
The present invention is by carrying out ultrasonication to stalk, using the fuel factor and cavitation effect of ultrasonic wave to stalk surface
Wax coat handled, so that smooth stalk surface is formed apparent gully form, substantially increase the roughness on surface, valence
The sizing materials such as the cheap air aldehyde resin of lattice can be immersed inside stalk by coarse surface, promote the leaching of the matrix resin of sizing material
Profit, diffusion, infiltration etc., improve the glue performance of stalk.
Using ultrasonication, at acid processing and steam treated, biological enzyme pretreatment, alkali process, chemical graft
Reason, low-temperature plasma processing etc., are more suitable for industrial production, and processing cost is low, and no three wastes, will not cause dirt to environment
Dye.
Preferably, stalk includes any one of rice straw and wheat straw waste.
During the preparation process, preferably stalk is modified, removes straw and leaf, section, the sheath of wheat straw waste etc., only retains
Stalk main part.
Preferably, stalk is crushed formation width is 0.5-3mm, and length is the sheet of 3-10mm.It is furthermore preferred that by stalk
Crushing formation width is 1-2mm, and length is the sheet of 4-6mm.
By being crushed to certain size so that ultrasonic treatment can laminated structure stepless action to stalk, from
Prepared by the bonding capacity of stalk is uniform everywhere in plate, plate property is excellent.
In order to remove ash content, avoid influence of the ash content to stalk surface before ultrasonic treatment, after preferably stalk is crushed,
It is placed in water, agitator treating.Preferably, the solid concentration of stalk in water be 2-4%, preferably 3%.In order to better
Ash content is removed, hot water washing can be used, the preferably temperature of water is 50-80 DEG C.
Preferably, the stalk after washing is dehydrated, makes the mass dryness fraction 25% of stalk, then carry out ultrasonication.
Appropriate dehydration is carried out to stalk, ultrasonication is enable to be applied directly to stalk surface, meanwhile, stalk still has
Certain water content, so that the cavitation bubble in water in stalk vibrates under the action of sound wave, with ultrasound under ultrasonication
Wave treatment progress, bubble collapse, burst, and so that the surface of stalk is formed apparent gully form, further increase table
The roughness in face.
Above-mentioned mass dryness fraction range is to be dehydrated the mass dryness fraction that can reach by normal extrusion, under this mass dryness fraction, between stalk
Substantially there is no water phase, moisture mainly in the lumen and cell wall inside stalk, is conducive to ultrasonic wave to stalk surface wax
The effect of matter layer.Also, in technique level, if to further increase mass dryness fraction, needs to reinforce dehydration, can greatly improve
Process costs.Thus, within the above range by regulation mass dryness fraction, process costs are suitable, and can cooperate Ultrasonic Conditions, to straw
The wax coat on stalk surface acts on, and improves the roughness on surface.
Preferably, it is 100-200kW that the condition of ultrasonication, which includes: the power of ultrasound, and ultrasonic frequency is 30-
40kHz, ultrasonic time are 30-60min.
Preferably, before ultrasonication, stalk is mixed with sodium hydroxide solution.It is furthermore preferred that by stalk and quality
The sodium hydroxide solution that score is 0.5-2% mixes.It is further preferred that the additional amount of sodium hydroxide solution is 0-0.5%, more
Preferably 0.05-0.3%.
Before ultrasonication, it is uniformly mixed with suitable sodium hydroxide solution with stalk tablet, ultrasonic place can be strengthened
Effect is managed, increases the smooth wax coat in stalk surface and is destroyed degree.It avoids addition amount of sodium hydroxide excessive simultaneously, it is fine to destroy stalk
Structure is tieed up, contaminated wastewater is generated.
Preferably, the dry mass dryness fraction 7-12% for making stalk.It, can will be after ultrasonication such as in specific operation
Stalk is sent into airflow stirring baker and carries out drying and processing, and stalk is made to reach target mass dryness fraction 7-12%.
Preferably, the dosage of sizing material is the 3-30% of the quality of the stalk after drying.
The usage amount of sizing material can be adjusted according to the requirement of practical plate, make straw board that there is different mechanical properties etc..
Preferably, sizing material includes urea-formaldehyde resin adhesive, cyanurotriamide modified urea resin adhesive, melamine-urine
One of plain cocondensation adhesive, synvaren, ethene-vinyl acetate hot melt adhesive stick are a variety of, preferably wrap
Include any one of cyanurotriamide modified urea resin adhesive, melamine-urea co-condensation adhesive.
Preparation method through the invention uses the air aldehyde resins such as cheap Lauxite as sizing material, that is, can promote
Matrix resin improves the glue performance of stalk to the wet of stalk, diffusion, infiltration etc. in sizing material, and then improves straw board
Performance.Using preparation method of the invention, especially when preparing soft board, can promote sizing material to the infiltration of stalk, diffusion and
Infiltration etc. greatly improves the performances such as bending strength, tensile strength, the elongation at break of soft board.
Preferably, it is 170-200 DEG C that the molding method of pressing plate, which includes: in temperature, and pressure is the condition of 3.0-4.5MPa
Under, with 40-60s/mm rate, obtain the plate of 0.5-6mm.
Within the above range, the straw board function admirable being prepared can meet using need the molding parameter of pressing plate
It asks.It is furthermore preferred that it is 180-190 DEG C that the molding method of pressing plate, which includes: in temperature, under conditions of pressure is 3.5-4.0MPa, with
45-55s/mm rate obtains the plate of 0.5-6mm.
The present invention also provides a kind of straw boards being prepared using the above method.
Straw board of the invention promotes the matrix resin of sizing material into stalk by improving the glue performance of stalk
Infiltration, diffusion and the infiltration in portion etc., to improve the performance of straw board.
The present invention also provides a kind of methods for adjusting plate hardness using above-mentioned preparation method, by adjusting ultrasonic wave
Handle time and/or ultrasonication power and/or ultrasonication frequency and/or sodium hydroxide solution mass fraction and/or
Sodium hydroxide concentration and/or sizing material type and/or rubber material using quantity, obtain the straw board of different soft and hard degree.
As in different embodiments, by adjusting sizing material type, such as glued using containing ethene-vinyl acetate hot melt adhesive
The sizing material of agent is mixed with treated stalk, pressing plate forms, and obtains corresponding soft straw board.Further, pass through tune
Whole sizing material type and dosage, obtain the soft board of varying strength.
As in different embodiments, by adjusting sizing material type, such as using urea-formaldehyde resin adhesive, cyanurotriamide modified
Any one of urea-formaldehyde resin adhesive, melamine-urea cocondensation adhesive or synvaren, with above-mentioned processing
Stalk mixing, pressing plate molding afterwards, obtain corresponding hard straw board.
As in different embodiments, pass through adjusting ultrasonic treatment time and/or ultrasonication power and/or ultrasound
Wave processing frequency and/or sodium hydroxide solution mass fraction and/or sodium hydroxide concentration etc., the stalk surface adjusted it is thick
Rugosity obtains the straw board of different soft and hard degree to adjust the glue performance between stalk and sizing material.
Compared with prior art, the invention has the benefit that
(1) present invention is by carrying out ultrasonication to stalk, using the fuel factor and cavitation effect of ultrasonic wave to stalk
The wax coat on surface is handled, and so that smooth stalk surface is formed apparent gully form, is substantially increased the coarse of surface
Degree, improves the glue performance of stalk；
(2) stalk is handled by means of the present invention, it can using sizing materials such as cheap air aldehyde resins
It is immersed inside stalk by coarse surface, promotes infiltration, diffusion, infiltration of the matrix resin of sizing material etc., improving plate
While energy, the cost of plate is reduced；
(3) method of the invention is easy to operate, reproducible, is suitable for industrial production, and no pollution to the environment；
(4) straw board of the invention promotes the matrix resin of sizing material to stalk by improving the glue performance of stalk
Internal infiltration, diffusion and infiltration etc., so that plate property is excellent.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with specific embodiment, but ability
Field technique personnel will be understood that following described embodiments are some of the embodiments of the present invention, instead of all the embodiments,
It is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.The person that is not specified actual conditions in embodiment, carries out according to conventional conditions or manufacturer's recommended conditions.Agents useful for same or instrument
Production firm person is not specified, is the conventional products that can be obtained by commercially available purchase.
The part material information that various embodiments of the present invention use is as follows:
Urea-formaldehyde resin adhesive, source: the illustrious and influential Chemical Co., Ltd. in Dongguan, model: 818 bent wood glues；
Cyanurotriamide modified urea resin adhesive, source: big Asia wood industry (Jiangsu) Co., Ltd's system production glue, content
Greater than 50%；
Melamine-urea cocondensation adhesive, source: big Asia wood industry (Jiangsu) Co., Ltd's system production glue, content
Greater than 50%；
Synvaren, source: Hebei Ze Tian Chemical Co., Ltd., model: 2127-1；
Ethene-vinyl acetate class (EVA lotion) hot melt adhesive, source: the fragrant milky way Chemical Co., Ltd. in Hubei, model:
BJ-707EVA lotion.
Various embodiments of the present invention are illustrated by taking wheat straw waste as an example, and the method phase of straw board is prepared using rice straw
Together.
Embodiment 1
The preparation method of the straw board of the present embodiment, includes the following steps:
(1) feedstock processing:
The parts such as leaf, section, the sheath of wheat straw waste are removed, stalk main part is only retained；By wheat straw waste through pulverizer machine
Spare, the sheet size of smashed wheat straw waste after tool crushes are as follows: width 1-2mm, length 4-6mm；
(2) smashed wheat straw waste is weighed, by 3% solid concentration, in the hydraulic mixer that water temperature is 65 DEG C
Washing, with impurity such as the ash contents that removes stalk；Stalk after washing is subjected to extrusion dehydration, so that stalk mass dryness fraction is 25%；
(3) (sodium hydroxide concentration is stalk quality to the sodium hydrate aqueous solution that addition concentration is 1% in screw conveyor
0.2%), stalk by screw conveyor be sent into processor for ultrasonic wave in carry out ultrasonication, the condition of ultrasonication
It is: ultrasonic power 150kW, supersonic frequency 35kHz, ultrasonic time 50min；
(4) stalk after ultrasonic treatment in step (3) is sent into airflow stirring baker and carries out drying and processing, make stalk
Mass dryness fraction is 10%；Stalk after drying and processing is sent into glue spraying malaxation device, setting spray gun carries out glue spraying in malaxation device, and resin added is
It is sent into 15% of stalk quality in malaxation device, sizing material is urea-formaldehyde resin adhesive, and stirring mixes stalk uniformly with sizing material；
(5) stalk of the sizing material of mix in step (4) is transferred to the moulding press (mould of previously prepared design shape structure
Tool) in, the weight of the stalk of required mix sizing material is calculated according to the thickness of required plate, dimensions, is mated formation after weighing, so
Precompressed and hot pressing are carried out in moulding press afterwards, is then cooled down, carries out cutting edge, sanding processing etc. after taking out plate；
Wherein, the condition of precompressed are as follows: temperature is 110 DEG C, pressure 1.1MPa, rate 30s/mm；
The condition of hot pressing are as follows: temperature is 185 DEG C, pressure 3.5MPa, obtains the stalk board of 2mm thickness with 50s/mm rate
Material.
Embodiment 2
The preparation method of the straw board of the present embodiment, includes the following steps:
(1) feedstock processing:
The parts such as leaf, section, the sheath of wheat straw waste are removed, stalk main part is only retained；By wheat straw waste through pulverizer machine
Spare, the sheet size of smashed wheat straw waste after tool crushes are as follows: width 1-2mm, length 4-6mm；
(2) smashed wheat straw waste is weighed, by 3% solid concentration, in the hydraulic mixer that water temperature is 65 DEG C
Washing, with impurity such as the ash contents that removes stalk；Stalk after washing is subjected to extrusion dehydration, so that stalk mass dryness fraction is 25%；
(3) stalk that step (2) obtains is sent into processor for ultrasonic wave by screw conveyor and carries out ultrasonication,
The condition of ultrasonication is: ultrasonic power 150kW, supersonic frequency 35kHz, ultrasonic time 50min；
(4) stalk after ultrasonic treatment in step (3) is sent into airflow stirring baker and carries out drying and processing, make stalk
Mass dryness fraction is 10%；Stalk after drying and processing is sent into glue spraying malaxation device, setting spray gun carries out glue spraying in malaxation device, and resin added is
It is sent into 15% of stalk quality in malaxation device, sizing material is urea-formaldehyde resin adhesive, and stirring mixes stalk uniformly with sizing material；
(5) stalk of the sizing material of mix in step (4) is transferred to the moulding press (mould of previously prepared design shape structure
Tool) in, the weight of the stalk of required mix sizing material is calculated according to the thickness of required plate, dimensions, is mated formation after weighing, so
Precompressed and hot pressing are carried out in moulding press afterwards, is then cooled down, carries out cutting edge, sanding processing etc. after removing plate；
Wherein, the condition of precompressed are as follows: temperature is 110 DEG C, pressure 1.1MPa, rate 30s/mm；
The condition of hot pressing are as follows: temperature is 185 DEG C, pressure 3.5MPa, obtains the stalk board of 2mm thickness with 50s/mm rate
Material.
Embodiment 3
The preparation method of the present embodiment each group reference implementation example 1, difference are only that:
First group: the condition of ultrasonication are as follows: ultrasonic power is 300kW, and ultrasonic frequency is 35kHz, ultrasonic
Time is 50min；
Second group: the condition of ultrasonication are as follows: ultrasonic power is 50kW, and ultrasonic frequency is 35kHz, ultrasonic
Time is 50min；
Third group: the condition of ultrasonication are as follows: ultrasonic power is 100kW, and ultrasonic frequency is 35kHz, ultrasonic
Time is 50min；
4th group: the condition of ultrasonication are as follows: ultrasonic power is 200kW, and ultrasonic frequency is 35kHz, ultrasonic
Time is 50min；
5th group: the condition of ultrasonication are as follows: ultrasonic power is 150kW, and ultrasonic frequency is 20kHz, ultrasonic
Time is 50min；
6th group: the condition of ultrasonication are as follows: ultrasonic power is 150kW, and ultrasonic frequency is 50kHz, ultrasonic
Time is 50min；
7th group: the condition of ultrasonication are as follows: ultrasonic power is 150kW, and ultrasonic frequency is 30kHz, ultrasonic
Time is 50min；
8th group: the condition of ultrasonication are as follows: ultrasonic power is 150kW, and ultrasonic frequency is 40kHz, ultrasonic
Time is 50min；
9th group: the condition of ultrasonication are as follows: ultrasonic power is 150kW, and ultrasonic frequency is 35kHz, ultrasonic
Time is 30min；
Tenth group: the condition of ultrasonication are as follows: ultrasonic power is 150kW, and ultrasonic frequency is 35kHz, ultrasonic
Time is 60min.
Embodiment 4
The preparation method of the present embodiment each group reference implementation example 1, difference are only that:
First group: the sheet size of smashed wheat straw waste are as follows: width 2-3mm, length 6-10mm；
Second group: the sheet size of smashed wheat straw waste are as follows: width 2-3mm, length 3-4mm.
Embodiment 5
The preparation method of the present embodiment each group reference implementation example 1, difference are only that:
First group: resin added is 3% of stalk quality in being sent into malaxation device in step (4)；
Second group: resin added is 30% of stalk quality in being sent into malaxation device in step (4).
Embodiment 6
The preparation method of the present embodiment each group reference implementation example 1, difference are only that:
First group: the sizing material in step (4) is cyanurotriamide modified urea resin adhesive；
Second group: the sizing material in step (4) is melamine-urea cocondensation adhesive；
Third group: the sizing material in step (4) is synvaren.
Embodiment 7
The preparation method for present embodiments providing a kind of soft straw board, includes the following steps:
(1) feedstock processing:
The parts such as leaf, section, the sheath of wheat straw waste are removed, stalk main part is only retained；By wheat straw waste through pulverizer machine
Spare, the sheet size of smashed wheat straw waste after tool crushes are as follows: width 1-2mm, length 4-6mm；
(2) smashed wheat straw waste is weighed, by 3% solid concentration, in the hydraulic mixer that water temperature is 65 DEG C
Washing, with impurity such as the ash contents that removes stalk；Stalk after washing is subjected to extrusion dehydration, so that stalk mass dryness fraction is 25%；
(3) (sodium hydroxide concentration is stalk quality to the sodium hydrate aqueous solution that addition concentration is 1% in screw conveyor
0.2%), stalk by screw conveyor be sent into processor for ultrasonic wave in carry out ultrasonication, the condition of ultrasonication
It is: ultrasonic power 150kW, supersonic frequency 35kHz, ultrasonic time 50min；
(4) stalk after ultrasonic treatment in step (3) is sent into airflow stirring baker and carries out drying and processing, make stalk
Mass dryness fraction is 10%；Stalk after drying and processing is sent into glue spraying malaxation device, setting spray gun carries out glue spraying in malaxation device, and resin added is
It is sent into 15% of stalk quality in malaxation device, sizing material is urea-formaldehyde resin adhesive and ethene-vinyl acetate hot melt adhesive stick
Mixture, the mass ratio of the two are 4 ﹕ 1, and stirring mixes stalk uniformly with sizing material；
(5) stalk of the sizing material of mix in step (4) is transferred to the moulding press (mould of previously prepared design shape structure
Tool) in, the weight of the stalk of required mix sizing material is calculated according to the thickness of required plate, dimensions, is mated formation after weighing, so
Precompressed and hot pressing are carried out in moulding press afterwards, is then cooled down, carries out cutting edge, sanding processing etc. after taking out plate；
Wherein, the condition of precompressed are as follows: temperature is 110 DEG C, pressure 1.1MPa, rate 30s/mm；
The condition of hot pressing are as follows: temperature is 185 DEG C, pressure 3.5MPa, obtains the soft straw of 2mm thickness with 50s/mm rate
Stalk plate.
Embodiment 8
The preparation method of the present embodiment reference implementation example 7, difference are: sizing material is cyanurotriamide modified urea resin gluing
The mixture of agent and ethene-vinyl acetate hot melt adhesive stick, the mass ratio of the two are 4 ﹕ 1.
Embodiment 9
The preparation method of the present embodiment reference implementation example 7, difference are: sizing material is melamine-urea cocondensation gluing
The mixture of agent and ethene-vinyl acetate hot melt adhesive stick, the mass ratio of the two are 4 ﹕ 1.
Embodiment 10
The preparation method of the present embodiment each group reference implementation example 1, difference are only that:
First group: in step (5), the condition of hot pressing are as follows: temperature is 170 DEG C, and pressure 3.0MPa is obtained with 40s/mm rate
To the straw board of 4mm thickness；
Second group: in step (5), the condition of hot pressing are as follows: temperature is 200 DEG C, and pressure 4.5MPa is obtained with 60s/mm rate
To the straw board of 4mm thickness.
Embodiment 11
The preparation method of the present embodiment each group reference implementation example 1, difference are only that:
First group: in step (2), the stalk after washing being subjected to extrusion dehydration, so that stalk mass dryness fraction is 20%；
Second group: in step (2), the stalk after washing being subjected to extrusion dehydration, so that stalk mass dryness fraction is 30%.
Comparative example 1
The preparation method of comparative example reference implementation example 1, difference are: without the ultrasonication of step (3).
Comparative example 2
The preparation method of comparative example reference implementation example 7, difference are: without the ultrasonication of step (3).
Experimental example
The performance for the straw board being prepared for comparative illustration various embodiments of the present invention and comparative example is tested, right
Elasticity modulus, static bending strength, internal bond strength and the thickness swelling rate performance of obtained hard plate are tested, to obtaining
The bending strength of soft board, tensile strength, elongation at break, thickness swelling rate tested, test result is shown in Table 1 He
Table 2.
The performance test results of 1 different hardness plate of table
The performance test results of the different soft boards of table 2
| Group | Bending strength | Tensile strength | Elongation at break | Thickness swelling rate |
| Embodiment 7 | 3.44MPa | 2.47MPa | 12.2% | 6.94% |
| Embodiment 8 | 3.76MPa | 2.51MPa | 13.61% | 6.21% |
| Embodiment 9 | 3.85MPa | 2.56MPa | 13.82% | 6.13% |
| Comparative example 2 | 1.96MPa | 1.07MPa | 7.26% | 13.52% |
By the shape of the stalk of stalk and comparative example 1 without ultrasonication after 1 ultrasonication of the embodiment of the present invention
Looks carry out observation comparison, and under the conditions of same amplification factor, the stalk surface after ultrasonication forms apparent gully shape
State, roughness are high；And the stalk smooth surface without ultrasonication.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of preparation method of straw board, which comprises the steps of:
Stalk is crushed, after washing, being dehydrated, carries out ultrasonication, after dry, mixes, pressing plate molding, obtains described with sizing material
Straw board；
The condition of the ultrasonication includes: that the power of ultrasound is 50-300kW, and ultrasonic frequency is 20-50kHz, ultrasonic
Time is 20-80min；
It is described to be dehydrated the mass dryness fraction 20-30% for making stalk.
2. the preparation method of straw board according to claim 1, which is characterized in that the condition packet of the ultrasonication
Include: the power of the ultrasound is 100-200kW, and the frequency of the ultrasound is 30-40kHz, and the time of the ultrasound is 30-
60min。
3. the preparation method of straw board according to claim 1, which is characterized in that, will before the ultrasonication
Stalk is mixed with sodium hydroxide solution；
Preferably, stalk is mixed with the sodium hydroxide solution that mass fraction is 0.5-2%；
Preferably, the dosage of the sodium hydroxide is the 0-0.5% of the quality of stalk；
It is furthermore preferred that the dosage of the sodium hydroxide is the 0.05-0.3% of the quality of stalk.
4. the preparation method of straw board according to claim 1, which is characterized in that after crushing the stalk, be placed in
In water, agitator treating；
Preferably, when washing, the solid concentration of the stalk in water is 2-4%；
Preferably, the temperature of the water is 50-80 DEG C；
Preferably, the stalk after washing is dehydrated, makes the mass dryness fraction 25% of stalk, then carry out ultrasonication.
5. the preparation method of straw board according to claim 1, which is characterized in that be by stalk crushing formation width
0.5-3mm, length are the sheet of 3-10mm；
Preferably, stalk is crushed formation width is 1-2mm, and length is the sheet of 4-6mm.
6. the preparation method of straw board according to claim 1, which is characterized in that the stalk include rice straw and
Any one of wheat straw waste.
7. the preparation method of straw board according to claim 1, which is characterized in that the drying makes the mass dryness fraction of stalk
It after 7-12%, is mixed with sizing material, pressing plate molding；
Preferably, the dosage of the sizing material is the 3-30% of the quality of the stalk after drying；
Preferably, the sizing material includes urea-formaldehyde resin adhesive, cyanurotriamide modified urea resin adhesive, melamine-urine
One of plain cocondensation adhesive, synvaren, ethene-vinyl acetate hot melt adhesive stick are a variety of.
8. the preparation method of straw board according to claim 1, which is characterized in that the molding method packet of pressing plate
It includes: being 170-200 DEG C in temperature, under conditions of pressure is 3.0-4.5MPa, with 40-60s/mm rate, obtain with a thickness of 0.5-
The plate of 6mm；
Preferably, it is 180-190 DEG C that the molding method of the pressing plate, which includes: in temperature, under conditions of pressure is 3.5-4.0MPa,
With 45-55s/mm rate, the plate with a thickness of 0.5-6mm is obtained.
9. the straw board being prepared using the preparation method of the described in any item straw boards of claim 1-8.
10. the method for adjusting plate hardness using the preparation method of the described in any item straw boards of claim 1-8, special
Sign is, by adjusting ultrasonic treatment time and/or ultrasonication power and/or ultrasonication frequency and/or hydrogen-oxygen
Change sodium solution mass fraction and/or sodium hydroxide concentration and/or sizing material type and/or rubber material using quantity, obtains different soft and hard degree
Straw board.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112458777A (en) * | 2020-11-05 | 2021-03-09 | 江西中竹生物质科技有限公司 | Method for manufacturing rice straw pulp by ultrasonic wave |
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Application publication date: 20190521 |