CN104788980B - Controllable biodegradable material and application thereof - Google Patents
Controllable biodegradable material and application thereof Download PDFInfo
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- CN104788980B CN104788980B CN201510222317.4A CN201510222317A CN104788980B CN 104788980 B CN104788980 B CN 104788980B CN 201510222317 A CN201510222317 A CN 201510222317A CN 104788980 B CN104788980 B CN 104788980B
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Abstract
The invention discloses a controllable biodegradable material. The controllable biodegradable material is formed by mixing a biomass powdery material, a binding agent and a compound dryer in a mass ratio of 1:(0.6-0.8):(0.03-0.13) and can be applied to preparation of a degradable seedling raising container. The controllable biodegradable material has the advantages that biodegradation controllability is realized by regulating a ratio of urea to plasma grafted basalt fibres in the controllable biodegradable material; the higher the content of urea in the controllable biodegradable material is, the shorter the degradation period of the controllable biodegradable material is; the controllable biodegradable material has different degradation periods by regulating the ratio of urea to the plasma grafted basalt fibres, requirements of different plant varieties in a seedling raising period can be met, and the controllable biodegradable material is rich in soybean nitrogen, so that a large amount of nutrient elements can be released in a biodegradation process, and growth of seedlings can be facilitated.
Description
Technical field
The present invention relates to biodegradation material field, particularly a kind of controllable biodegradable material and its application.
Background technology
It is biodegradable to refer under natural environmental condition that is appropriate and can be shown that the time limit, can be by microorganism（As antibacterial,
Funguses and algae etc.）Decompose or be degraded into low molecular compound.In recent years, as agricultural technology develops, to crops, gardening flower
Grass, melon vegetable and forest etc. carry out the agricultural planting technique that nursery in advance transplanted again and gradually promote to north from south, container nursery
Total amount is increased year by year, therefore the demand to container for plant growth also increases year by year.At present, container for plant growth mostly is plastic material, but plastics
Should not decompose in soil, easily endanger soil, Environmental security, easily cause white pollution, particularly resource environment pressure in the last few years
Power is drastically increased, and Public environmental attitude is improved, and developing a kind of Biodegradable material that can be applicable to prepare seedling container becomes
The focus of this area research.
A kind of straw water storage container for plant growth is disclosed in patent CN1478376, its with straw as raw material, polyacrylamide
For adhesive, in extrusion forming, but its molding process, polyacrylamide usage amount is few, cold pressure procedure middle mold plastic moisture content
Greatly, natural drying or artificial drying are needed after the demoulding, technique is loaded down with trivial details, and polyacrylamide is used as adhesive, cohesion is not
By force, easily scatter after meeting water, bowl is easily scattered during nursery, bowl is affected with the efficiency of transplantation of seedlings；Patent
201110377910.8 disclose a kind of degradable nourishing container for plant growth, and, with bacterium garbage, Plant fiber as raw material, molding is imitated for which
It is really good, but the adhesive used by the patent contains polyethylene, polypropylene or polrvinyl chloride non-degradable material, and the demoulding is only obtained in fact
To the semi-finished product of container for plant growth, the later stage is needed further to process, tedious process；Patent 200710185302.0 reports one kind
Complete degradable high effective fertilizer seedling raising container, hot pressing after being mixed by powder of straw, flyash, adhesive, firming agent and waterproofing agent are formed, but its
It is main adhesive with simple Lauxite, Lauxite refractory organicses, its wall there is penetrated with obstruction and make to root system of plant
With being unfavorable for the later growth of seedling replanting；The patent of Publication No. CN1268283 provides a kind of plant fibre pot for seedling,
Materials of a pot body includes Plant fiber, dry shape cereal starch and releasing agent, and dry shape cereal starch is used as adhesive, is preparing
During need to add water, it is hot-forming in be also easy to produce and blow out phenomenon, product appearance is not only coarse, and wet strength is low, it is difficult to which guarantee is educated
Seedling stage nursery pot body integrity, it is impossible to meet the nursery demand of various forests, vegetable, flowers.
The technology that research both at home and abroad at present prepares degradable seedling culture container is more, and the raw material of employing is mainly farm-forestry crop
The natural degradable biological materials such as leftover bits and pieces, sludge, peat, waste edible fungus mushroom bran, in these degradation materials, or use
The biomass adhesive of Wholly-degradable but wet strength not enough, container for plant growth poor water resistance, or use synthetic macromolecule resin,
Container for plant growth intensity height but difficult degradation, have impact on crop root penetrance.Therefore, develop one kind and can both ensure that nursery stage body is strong
Degree, while the fast degradation after with transplantation of seedlings, meets the controllable biodegradable material that different nursery stages are required, remain this area
Technical barrier urgently to be resolved hurrily.
The content of the invention
For the problems referred to above, the present invention provides a kind of controllable biodegradable material, with container for plant growth prepared by the material, can
To meet the difference growing-seedling period such as nursery stock, flowers as the requirement to container for plant growth degradability, what the present invention was realized in：
A kind of controllable biodegradable material, the controllable biodegradable material be by powdery biomass material, adhesive and
Compounding drier is with mass ratio 1:0.6-0.8:Obtain after 0.03-0.13 mixing；
It is described to compound drier for the one kind or combinations thereof thing in phyllosilicate, montmorillonite, bentonite；
What the powdery biomass material was obtained by：Agriculture and forestry organic waste material is crushed to below 10 mesh, is adjusted with nitrogenous fertilizer
Carbon-nitrogen ratio is 25-30:1, regulation moisture is 60-65%, then accesses straw decomposing inoculant, 35-55 by the mass ratio of 1-5kg/t
Dry after DEG C temperature bottom fermentation 4-5d, that is, obtain the powdery biomass material；
The adhesive is to obtain by the following method：
（a）Distilled water is added to defatted soybean flour, the bean cake suspension that concentration is 15-25% is configured to；
（b）Basalt fibre is put in plasma surface modification processing instrument, 3min is processed under 170W discharge powers, so
Immersed in the maleic anhydride solution of 0.05mol/L afterwards, addition accounts for the benzoyl peroxide of basalt fibre quality 0.5-1%, immersion
Take out after 2h, 103 DEG C of drying obtain plasma grafting basalt fibre；
（c）The formalin of mass fraction 36-37% is added in reactor, it is 8.5 to adjust pH, adds polyvinyl alcohol, rises
Temperature adds carbamide, then is warming up to 60 DEG C to 40 DEG C, is incubated 20min, is subsequently adding the plasma grafting basalt of step b acquisition
Fiber, 180-350rpm stirring reactions 10-20min；
Wherein, 2.5-4.2% of the added formalin quality for bean cake suspension quality, polyvinyl alcohol quality are bean cake
The 0.9-1.3% of suspension quality, 1.8-3.5% of the carbamide for bean cake suspension quality, plasma grafting basalt fibre are bean
The 0.5-0.7% of dregs of rice suspension quality；
（d）During the bean cake suspension that step a is obtained adds reactor, it is 8.5,60 DEG C of reaction 30min to adjust pH；Then
Carbamide and defatted soybean flour, 60 DEG C of insulation 20min is added to be cooled to 45 DEG C, that is, obtain the adhesive again；
Wherein, the carbamide for adding again is 1-1.25 with the mass ratio of defatted soybean flour in bean cake suspension:12.5, it is added
Enter defatted soybean flour quality for 1/3 of defatted soybean flour quality in bean cake suspension.
Further, in the present invention, the agriculture and forestry organic waste material is the one kind in rice husk, powder of straw, wood leftover material or bamboo powder
Or combinations thereof thing.
Further, in the present invention, the nitrogenous fertilizer is carbamide, ammonium hydrogencarbonate, Diammonium phosphate (DAP), the one kind or many in sulphuric acid diammonium
Kind.
Application of the controllable biodegradable material in degradable seedling culture container is prepared as described herein.
The application of controllable biodegradable material as described herein, specifically, by moisture for 12-14% controllable life
Thing degradable material shaped by fluid pressure, prepares degradable seedling culture container.
Compared with prior art, the beneficial effects of the present invention is：
（1）In Biodegradable material of the present invention, adhesive is, with defatted soybean flour as base material, using formaldehyde, carbamide, to gather
Vinyl alcohol and basalt fibre are modified process to which, are reacted by alkaline hydrolysis, degeneration, addition and polycondensation etc., peptide in bean cake powder
Chain interruption, forms aminoacid short chain not of uniform size, promotes protein molecular chain grafting polyvinyl alcohol, basalt in building-up process
The prepolymer molecule of fiber and formaldehyde/urea, increased the bond strength and resistance to water of bean cake powder adhesive, while defatted soybean
Powder can release macronutrient in biodegradation process, be conducive to growth of seedling rich in abundant Semen sojae atricolor nitrogen.
（2）The present invention realizes biodegradation by the ratio of carbamide and plasma grafting basalt fibre in regulation material
Controllability, in general, carbamide proportion is more, and the material degradation cycle is shorter, by the regulation and control to the two ratio, real
The now regulation and control to the material degradation cycle/growing-seedling period, adapt to the requirement of different plant varieties growing-seedling period.
Description of the drawings
Fig. 1 is picture after embodiment of the present invention degradable seedling culture container is sowed 30 days.
Fig. 2 is picture after embodiment of the present invention degradable seedling culture container is transplanted 45 days.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention are of greater clarity, with reference to embodiments, to the present invention
Further describe, it will be appreciated that specific embodiment described herein only to explain the present invention, is not used to limit
The present invention.
Embodiment 1
（1）Prepare biomass powder material
The bamboo powder being crushed to below 10 mesh is adjusted into C/N ratios to 25-30 with Diammonium phosphate (DAP)：1, moisture is adjusted to 60-65%,
Inoculation straw decomposing inoculant, powdery biomass material per ton are inoculated with the straw decomposing inoculant of 1kg, and temperature is 35-55 DEG C, is fermented 4-5 days,
Naturally dry standby, acquisition biomass powder material；
（2）Prepare adhesive
（a）It is that 15% bean cake suspension is standby that defatted soybean flour distillation water dissolution is configured to mass concentration；
（b）Basalt fibre is carried out into corona treatment, surface modification of low temperature plasma processing instrument is placed on（Often
State new district Shi Tai plasma techniques development corporation, Ltd., HD-1B types）In, discharge power is 170W, and process time is 3min,
It is then placed in the maleic anhydride solution of 0.05mol/L, using benzoyl peroxide as initiator, the addition of benzoyl peroxide
The 0.5-1% for basalt fibre quality is measured, is taken out after immersion 2h, and is dried in 103 DEG C of drying baker, obtained plasma and connect
Branch basalt fibre；
（c）Take the formalin that 165g mass fractions are 36.5% and put into reactor, turn on agitator, with 275 revs/min
Clock is stirred, and it is 8.5 to adjust pH value with sodium hydroxide solution that mass fraction is 20%, adds 60g polyvinyl alcohol, start to warm up to
40 DEG C, 120g carbamide is put into, 60 DEG C are risen in 10min and 20min is incubated；After insulation terminates, the 35g plasma grafting Black Warriors are added
Rock fiber, is incubated 20min；
（d）The bean cake suspension that 6500g mass concentrations are 15% is added in reactor, it is 8.5 to adjust pH value, in 60 DEG C
Lower alkaline hydrolysis 30min；100g carbamide and 325g defatted soybean flours are added, 20min is incubated, cooling system is opened cold to reactor
But, blowing when temperature is down to 45 DEG C, that is, obtain adhesive.
By 5kg steps（1）The biomass powder material of acquisition, 3kg steps（2）The adhesive of acquisition, and 0.25kg illiteracies
In de- soil input high speed mixing smelting machine, 100 revs/min of stir speed (S.S.) is uniformly mixed, that is, obtain the controllable biodegradable material
Material.
The controllable biodegradable material that moisture is 14% is put in hydraulic forming machine die cavity, degradable nursery is pressed into
Container.
In specific operation process, the mass fraction of the formalin for being used can be in the range of 36-37%.
In June, 2014, the degradable seedling culture container 80 obtained with the present embodiment, the plastics examination in Jiangsu Province Agriculture Science Institute
Test, each container for plant growth broadcasts 2 Fructus Cucumidis sativi seeds, while plastic seeding culturing container is set up as control.
Degradable seedling culture container grows seedling for after planting 4 days, and germination percentage is higher than matched group by 10% or so, after 12 days between go it is weak
Seedling, each container for plant growth retain 1 plant of strong sprout, cucumber seedling and degradable seedling culture container are moved into land for growing field crops in the lump in after planting 20 days,
Matched group moves into land for growing field crops after removing plastic seeding culturing container again, using conventional cultivation and way to manage, degradable nursery after transplanting 5 days
Container starts disintegrate, and visible cucumber plant root system is from container disintegrate gap within 12 days（Or hole）In pass, container degradation rate after 35 days
Up to more than 85%, it is seen then that the growing-seedling period of the degradable seedling culture container is 25-35 days.
Embodiment 2
（1）Prepare biomass powder material
The wheat stalk below 10 mesh will be crushed to, C/N ratios are adjusted to 25-30 with carbamide：1, moisture is adjusted to 60-65%,
Then straw decomposing inoculant is inoculated with, powdery biomass material per ton is inoculated with the straw decomposing inoculant of 3kg, and temperature is 35-55 DEG C, and ferment 4-
Dry after 5 days, as biomass powder material.
（2）Prepare adhesive
（a）Defatted soybean flour distillation water dissolution is configured to into the bean cake suspension that mass concentration is 20% standby；
（b）Basalt fibre is carried out corona treatment to be set low in isothermal plasma surface modification treatment instrument, is put
Electrical power is 170W, and process time is 3min, is then placed in the maleic anhydride solution of 0.05mol/L, with benzoyl peroxide
As initiator（0.5-1% of its quality for basalt fibre amount）, take out after immersion 2h, and dry in 103 DEG C of drying baker
It is dry, obtain plasma grafting basalt fibre；
（c）Take the formalin that 217g mass fractions are 36.5% and put into reactor, turn on agitator, with 275 revs/min
Clock is stirred.It is 8.5 that pH value is adjusted with sodium hydroxide solution that mass fraction is 20%, adds 87g polyvinyl alcohol, start to warm up to
40 DEG C, 155g carbamide is put into, 60 DEG C are risen in 10min and 20min is incubated；After insulation terminates, the 45g plasma grafting Black Warriors are added
Rock fiber, is incubated 20min；
（d）The bean cake suspension that 6500g mass concentrations are 20% is added in reactor, it is 8.5 to adjust pH value, in 60 DEG C
Lower alkaline hydrolysis 30min；105g carbamide and 434g defatted soybean flours are added, 20min is incubated, cooling system is opened cold to reactor
But, blowing when temperature is down to 45 DEG C, that is, obtain adhesive.
By 5kg steps（1）The biomass powder material of acquisition, 3.5kg steps（2）The adhesive of acquisition, 0.15kg calcio
In bentonite and 0.5kg quick lime input high speed mixing smelting machine, 100 revs/min of stir speed (S.S.), mix homogeneously obtain described
Controllable biodegradable material.
The controllable biodegradable material that moisture is 12% is put in hydraulic forming machine die cavity, degradable nursery is pressed into
Container.
In June, 2014, the degradable seedling culture container 80 obtained with the present embodiment, the plastics examination in Jiangsu Province Agriculture Science Institute
Test, each degradable seedling culture container broadcasts 2 Semen Maydiss seeds, while setting up plastic seeding culturing container conduct
Control.
Degradable seedling culture container, sowing 8 days after grow seedling, germination percentage is higher than matched group by 10% or so, after 15 days between go it is weak
Seedling, each container for plant growth retain 1 plant of strong sprout.Maize seedling rootses pass container for plant growth wall within after planting 30 days（As shown in Figure 1）,
Corn seedling and degradable seedling culture container are moved into into land for growing field crops in the lump subsequently, matched group moves into big again after removing plastic seeding culturing container
Field, using conventional cultivation and way to manage.After transplanting 10 days, degradable seedling culture container starts disintegrate, 15 days visible milpa roots
System is from container disintegrate gap（Or hole）In pass, after 45 days, container degradation rate and will become apparent from the drop of container for plant growth up to more than 75%
Solution（As shown in Figure 2）, it is seen that the growing-seedling period of the degradable seedling culture container is 30-50 days.
Embodiment 3
（1）Prepare biomass powder material
The rice husk being crushed to below 10 mesh is adjusted into C/N ratios to 25-30 with carbamide：1, regulation moisture to 60-65%, then
Inoculation straw decomposing inoculant, powdery biomass material per ton are inoculated with the straw decomposing inoculant of 5kg, and temperature is 35-55 DEG C, is fermented 4-5 days
After dry, as biomass powder material.
（2）Prepare adhesive
（a）Defatted soybean flour distillation water dissolution is configured to into the bean cake suspension that mass concentration is 25% standby；
（b）Corona treatment is carried out to basalt fibre, is placed in surface modification of low temperature plasma processing instrument,
Discharge power is 170W, processes 3min, is immersed in the maleic anhydride solution of 0.05mol/L, with benzoyl peroxide after taking-up
As initiator（0.5-1% of its quality for basalt fibre amount）, take out after immersion 2h, be placed in 103 DEG C of drying baker and dry
It is dry, obtain plasma grafting basalt fibre；
（c）Take the formalin that 270g mass fractions are 36.5% and put into reactor, turn on agitator, with 275 revs/min
Clock is stirred, and it is 8.5 to adjust pH value with sodium hydroxide solution that mass fraction is 20%, adds 80g polyvinyl alcohol, start to warm up to
When 40 DEG C, 225g carbamide is put into, 60 DEG C are risen in 10min and 20min is incubated；After insulation terminates, add 48g plasma graftings profound
Military rock fiber, is incubated 20min；
（d）The bean cake suspension that 6500g mass concentrations are 25% is added in reactor, it is 8.5 to adjust pH value, in 60 DEG C
Lower alkaline hydrolysis 30min；165g carbamide and 542g defatted soybean flours are added, 20min is incubated, cooling system is opened cold to reactor
But, when temperature is down to 45 DEG C, that is, obtain adhesive.
By 5kg steps（1）The biomass powder material of acquisition, 4kg steps（2）The adhesive of acquisition, and 0.15kg calcium
In base bentonite input high speed mixing smelting machine, 100 revs/min of stir speed (S.S.), mix homogeneously obtain the controllable biodegradable material
Material.
When mixed material moisture drops to 14% or so, mixed material is released.Then mixed material is put into into shaped by fluid pressure
In machine die cavity, degradable seedling culture container is pressed into, its growing-seedling period about 50-80 days.
In specific operation process, it can be rice husk, powder of straw, wood to prepare agriculture and forestry organic waste material used by biomass powder material
One or more in edge corner material or bamboo powder, can be carbamide, carbonic acid to the nitrogenous fertilizer for adjusting biomass powder material C/N ratios
One or more in hydrogen ammonia, Diammonium phosphate (DAP), sulphuric acid diammonium, the compounding drier for being used can be de- for phyllosilicate, illiteracy
One or more in soil, bentonite, these changes are capable of achieving the purpose of the present invention.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, such as in specific implementation process,
The ratio of carbamide and plasma grafting basalt fibre is adjusted, to prepare the biodegradation material of different growing-seedling periods,
These all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., should be included in this
Within bright protection domain.
Claims (5)
1. a kind of controllable biodegradable material, it is characterised in that the controllable biodegradable material be by powdery biomass material,
Adhesive and compounding drier are with mass ratio 1:0.6-0.8:Obtain after 0.03-0.13 mixing；
It is described to compound drier for the one kind or combinations thereof thing in phyllosilicate, montmorillonite, bentonite；
What the powdery biomass material was obtained by：Agriculture and forestry organic waste material is crushed to below 10 mesh, carbon nitrogen is adjusted with nitrogenous fertilizer
Than for 25-30:1, regulation moisture is 60-65%, then accesses straw decomposing inoculant by the mass ratio of 1-5kg/t, and 35-55 DEG C warm
Dry after degree bottom fermentation 4-5d, that is, obtain the powdery biomass material；
The adhesive is to obtain by the following method：
（a）Distilled water is added to defatted soybean flour, the bean cake suspension that concentration is 15-25% is configured to；
（b）Basalt fibre is put in plasma surface modification processing instrument, 3min is processed under 170W discharge powers, is then soaked
Enter in the maleic anhydride solution of 0.05mol/L, addition accounts for the benzoyl peroxide of basalt fibre quality 0.5-1%, after immersion 2h
Take out, 103 DEG C of drying obtain plasma grafting basalt fibre；
（c）The formalin of mass fraction 36-37% is added in reactor, it is 8.5 to adjust pH, adds polyvinyl alcohol, is warming up to
40 DEG C, carbamide is added, then is warming up to 60 DEG C, be incubated 20min, be subsequently adding the plasma grafting basalt fibre of step b acquisition,
180-350rpm stirring reactions 10-20min；
Wherein, 2.5-4.2% of the added formalin quality for bean cake suspension quality, polyvinyl alcohol quality are that bean cake is suspended
The 0.9-1.3% of liquid quality, 1.8-3.5% of the carbamide for bean cake suspension quality, plasma grafting basalt fibre are outstanding for bean cake
The 0.5-0.7% of turbid liquid quality；
（d）During the bean cake suspension that step a is obtained adds reactor, it is 8.5,60 DEG C of reaction 30min to adjust pH；Then again
Carbamide and defatted soybean flour, 60 DEG C of insulation 20min is added to be cooled to 45 DEG C, that is, obtain the adhesive；
Wherein, the carbamide for adding again is 1-1.25 with the mass ratio of defatted soybean flour in bean cake suspension:12.5, again plus
The defatted soybean flour quality for entering is 1/3 of defatted soybean flour quality in bean cake suspension.
2. controllable biodegradable material according to claim 1, it is characterised in that the agriculture and forestry organic waste material is rice husk, straw
One kind or combinations thereof thing in powder, wood leftover material or bamboo powder.
3. controllable biodegradable material according to claim 1 or claim 2, it is characterised in that the nitrogenous fertilizer is carbamide, bicarbonate
One or more in ammonia, Diammonium phosphate (DAP), sulphuric acid diammonium.
4. application of the controllable biodegradable material as claimed in claim 1 in degradable seedling culture container is prepared.
5. apply according to claim 4, it is characterised in that by the controllable biodegradable material liquid that moisture is 12-14%
It is molded, prepare degradable seedling culture container.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106565376B (en) * | 2016-10-26 | 2022-05-13 | 中国农业科学院农业环境与可持续发展研究所 | Slow-release nitrogen fertilizer formed based on straw polymerization and preparation method and application thereof |
| CN107893330A (en) * | 2017-12-28 | 2018-04-10 | 安徽宏实光机电高科有限公司 | A kind of preparation method of plasma grafting processing complex fiber material |
| CN108739242B (en) * | 2018-04-17 | 2020-06-02 | 长丰县恒进农业有限公司 | Preparation process of degradable seedling cup |
| CN111635648B (en) * | 2020-06-10 | 2022-03-29 | 广东省生物工程研究所（广州甘蔗糖业研究所） | Degradation promoter prepared by layer-by-layer coating method and preparation and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101167430A (en) * | 2007-11-22 | 2008-04-30 | 王书秀 | Complete degradable high effective fertilizer seedling raising bowl |
| CN101570638A (en) * | 2008-05-04 | 2009-11-04 | 赖诗金 | Plant fiber product and preparation method thereof |
| CN102504560A (en) * | 2011-11-07 | 2012-06-20 | 江苏省农业科学院 | Degradable seedling culture container, and preparation method and application thereof |
| CN103224764A (en) * | 2013-04-27 | 2013-07-31 | 甘肃圣大方舟马铃薯变性淀粉有限公司 | Wood adhesive with crop straws as raw material, and preparation method thereof |
-
2015
- 2015-05-05 CN CN201510222317.4A patent/CN104788980B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101167430A (en) * | 2007-11-22 | 2008-04-30 | 王书秀 | Complete degradable high effective fertilizer seedling raising bowl |
| CN101570638A (en) * | 2008-05-04 | 2009-11-04 | 赖诗金 | Plant fiber product and preparation method thereof |
| CN102504560A (en) * | 2011-11-07 | 2012-06-20 | 江苏省农业科学院 | Degradable seedling culture container, and preparation method and application thereof |
| CN103224764A (en) * | 2013-04-27 | 2013-07-31 | 甘肃圣大方舟马铃薯变性淀粉有限公司 | Wood adhesive with crop straws as raw material, and preparation method thereof |
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