CN107793228A - A kind of preparation method of the hydrophobic coated fertilizer of biodegradation type - Google Patents
A kind of preparation method of the hydrophobic coated fertilizer of biodegradation type Download PDFInfo
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- CN107793228A CN107793228A CN201711161990.7A CN201711161990A CN107793228A CN 107793228 A CN107793228 A CN 107793228A CN 201711161990 A CN201711161990 A CN 201711161990A CN 107793228 A CN107793228 A CN 107793228A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
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Abstract
The present invention relates to sustained-controll-release fertiliser preparing technical field, and in particular to a kind of preparation method of the hydrophobic coated fertilizer of biodegradation type.The present invention passes through caprylyl chloride and chitosan reaction first, obtain the acylation chitosan of low degree of substitution, again with glutaraldehyde as cross linker to the further modification of acylation chitosan, obtain the modification of chitosan of fine and close crosslinking, diatomite is modified using titanate coupling agent, polyvinyl alcohol surface is modified followed by silane coupler, make the estersil base of silane coupler and water that formation silanol base after hydrolysis occur, improve the hydrophobicity of coated fertilizer, polyvinyl alcohol surface is further modified using modification of chitosan and modification infusorial earth, further improve the biodegradable and hydrophobicity of coated fertilizer, the growth demand of different crops can be met, it is with a wide range of applications.
Description
Technical field
The present invention relates to sustained-controll-release fertiliser preparing technical field, and in particular to a kind of hydrophobic coated fertilizer of biodegradation type
Preparation method.
Background technology
Chemical fertilizer serves irreplaceable effect in grain and Agriculture Production is promoted.The statistics of the World Food Programme
Show, 40%~60% contribution for coming from fertilizer of world food volume increase, but the use of fertilizer also brings many unfavorable, such as makes
Into the significant wastage of resource, increase the pressure of environment, cause underground drinking water to pollute, and then influence human health.Seeking simultaneously
In the environment for supporting enrichment of element, the element composition of environment is not only changed, also necessarily triggers a series of rings such as body eutrophication
Border pollution problem.
Slow-release or control-release fertilizer is to delay fertilizer nutrient rate of release by various regulation mechanisms, extend crop to fertilizer nutrient
Absorb the cycle, such that fertilizer nutrient is repeatedly the speed fertilizer synchronous with crop demand.Slow-release or control-release fertilizer can both reduce chemical fertilizer
Usage amount, its utilization rate can be improved again, mitigate fertilizer excessively pollution of the administration to environment.Filmcoated controlled release fertilizer is in recent years
The sustained-controll-release fertiliser quickly grown, using granular chemical fertilizer as core, one layer of controlled-release material is coated on top layer to adjust chemical fertilizer nutrient
Release.For filmcoated controlled release fertilizer, the selection of its controlled-release material is to influence the principal element of its releasing effect.
High-molecular organic material is the slow controlled release coated fertilizer of current most study, and it is big to be broadly divided into natural and synthesis two
Class.Natural polymer coated fertilizer is that raw material is mainly the natural polymer product such as starch, cellulose, be characterized in source it is wide,
It is degradable, cost is low and moulding property is good, but because its degraded is too fast, slow release effect is not satisfactory.Synthesize macromolecule coated fertilizer
The thermosetting and thermoplastic resin that are formed usually are polymerize by the organic monomer derivative containing double bond, by the characteristic of material in itself
To influence nutrient diffusion rate, slow controlled-release effect is good, but such coated fertilizer production cost is higher, and technique is relative complex, can
Biological degradability is poor, easily pollutes problem to soil.
It would therefore be highly desirable to develop, a kind of raw material sources are extensive, slow controlled-release effect is good, and stability is strong, environmentally friendly, can give birth to
The strong coated fertilizer of thing degradability is highly desirable.
The content of the invention
The technical problems to be solved by the invention：For current common coated fertilizer exist biodegradable it is poor and
Waterproof effect is bad, the defects of can not meet crop growth demand, there is provided a kind of hydrophobic coated fertilizer of biodegradation type
Preparation method.
In order to solve the above technical problems, the present invention is using technical scheme as described below：
A kind of preparation method of the hydrophobic coated fertilizer of biodegradation type, it is characterised in that specifically preparation process is：（1）By etc. matter
Amount obtains mixture, continues to add the biogas slurry of mixture quality 0.9%, dress into mixture than shrimp shell and crab shell are mixed
Enter in fermentation tank, be sealed by fermentation, after fermentation ends, take out tunning, as chitosan-containing tunning, then by pyridine and three
Chloromethanes mixes, and obtains making solution by oneself；
（2）Chitosan-containing tunning and self-control solution are mixed and are placed in beaker after reaction, is continued under 0 DEG C of condition of ice bath
The caprylyl chloride of chitosan-containing tunning quality 10% is added dropwise into beaker, continues to mix reaction, reaction produces after terminating
Acylation chitosan crude product, acylation chitosan crude product is put into extractor, with acetone extraction, and is dried in vacuo, obtains acyl
Change Chitosan powder, acylation chitosan powder, the glacial acetic acid solution that mass fraction is 3% and glutaraldehyde are mixed and be placed in mixer
Middle stirring, modified self-control chitosan is produced after standing and defoaming；
（3）Weigh and 100 mesh sieves are crossed after 24~36g diatomite is ground, collect sieving powder, sieving powder and titanate esters is even
Connection agent 201 mixes, and obtains mixture, mixture is put into castor oil and compounding substances with mixture quality 0.7%
In the fermentation tank of the bed-silt of amount 6%, it is sealed by fermentation, after fermentation ends, takes out tunning, obtain modification infusorial earth powder
End；
（4）Added into the reactor equipped with electric mixer, thermometer and reflux 30~40g polyvinyl alcohol and 0.4~
0.5L deionized waters, which mix, to be dissolved, heat temperature raising, Temperature fall after insulated and stirred, then 12~16g is added into reactor
Chitosan, 6~8g modification infusorial earths powder, 10~12mL silane coupler KH-560 and 10~12g ambers, it is anti-to continue insulation
Should, modified poly ethylene alcoholic solution is produced, modified poly ethylene alcoholic solution is placed on glass culture dish and is cast, natural film forming, is dried
After discharge, you can biodegradation type hydrophobic coated fertilizer is made.
Step（1）Described mixing time is 16~20min, and fermentation temperature is 32~42 DEG C, and fermentation time is 7~9 days,
The volume ratio of pyridine and chloroform is 1：1, the mixing time is 4~6min.
Step（2）Described chitosan-containing tunning and the mass ratio of self-control solution are 1：3, the reaction time be 3~
5min, stirring reaction temperature are 55~75 DEG C, and the stirring reaction time be 1~2h, and extraction times are 4~6h, drying time for 1~
3h, the glacial acetic acid solution and the mass ratio of glutaraldehyde that acylation chitosan powder, mass fraction are 98% are 1：3：1, mixing time is
10~12min.
Step（3）The described time that grinds is 8~10min, and the mass ratio of sieving powder and silane coupler is 1：
2, the mixing time is 12~16min, and fermentation temperature is 36~40 DEG C, and fermentation time is 6~8 days.
Step（4）The described stirring and dissolving time is 1~3h, and heat temperature raising temperature is 90~110 DEG C, the insulated and stirred time
For 10~15min, cooling temperature is 50~60 DEG C, and the insulation reaction time is 1~3h.
Compared with other method, advantageous effects are the present invention：
（1）For the present invention using polyvinyl alcohol as raw material, diatomite and chitosan be modifying agent, using crosslinking, are blended that be prepared can
Biodegradation, coated fertilizer that can be hydrophobic, first by caprylyl chloride and chitosan reaction, chitosan main chain is set to introduce long alkane
Base, the acylation chitosan of low degree of substitution is obtained, so as to improve the hydrophobic ability of chitosan, then with glutaraldehyde as cross linker to acylation
Chitosan is further modified, and is obtained the modification of chitosan of fine and close crosslinking, because chitosan is modified through long-chain acyl chlorides, is consumed portion
Divide free amino and hydroxyl and introduce hydrophobic long-chain so that the hydrophobicity enhancing of chitosan, after adding glutaraldehyde cross-linking agent,
Crosslinking agent further reacts with remaining free amine group, hydroxyl, and chitosan main chain network becomes close, as crosslinking agent contains
The increase of amount, water absorbent rate decline, and contact angle increase, show that chitosan film crosslink density gradually increases, hydrophobic performance gradually increases
By force, so as to improving the hydrophobicity of coated fertilizer；
（2）The present invention recycles titanate coupling agent to be modified diatomite, and wherein diatomite contains abundant silica,
It is dispersed in the surface of polyvinyl alcohol, the adhesion strength of silica and polyvinyl alcohol is enhanced, due to silica
Chemical property it is more stable, it is not soluble in water, further enhance the hydrophobicity of polyvinyl alcohol, followed by silane coupler pair
Polyvinyl alcohol surface is modified, and makes the estersil base of silane coupler and water that formation silanol base after hydrolysis, silanol base occur
Hydroxyl reaction occurs with the surface of polyvinyl alcohol, part covalent bond is formed by drying and dehydrating, final silane coupler is in poly- second
Enol surface forms polymolecular cover layer, changes the intrinsic hydrophilic nmature of polyvinyl alcohol, improves the hydrophobicity of coated fertilizer again；
（3）The present invention is further modified using modification of chitosan and modification infusorial earth to polyvinyl alcohol surface, to a certain extent
It has impact on that modified polyvinylalcohol is intermolecular and the effect of intramolecular, introduce new group Si-H, change its structure, make coating
Certain degraded occurs for material, because chitosan and polyvinyl alcohol are all to be easy to biodegradable, all exists between the two weaker
The hydrogen bond ,-OH keys or-NH in-OH keys and chitosan after mixing in polyvinyl alcohol structures2Hydrogen bond can be formed between key, from
And change the characteristic of coated fertilizer, the biodegradable and hydrophobicity of coated fertilizer are further improved, different agricultures can be met
The growth demand of crop, is with a wide range of applications.
Embodiment
By waiting mass ratio that shrimp shell and crab shell are mixed into 16~20min, mixture is obtained, continues to add into mixture
The biogas slurry of mixture quality 0.9%, is fitted into fermentation tank, is sealed by fermentation 7~9 days, ferments under conditions of being 32~42 DEG C in temperature
After end, tunning is taken out, as chitosan-containing tunning, then by pyridine and chloroform be 1 by volume：1 mixing
4~6min is stirred, obtains making solution by oneself；It is 1 in mass ratio by chitosan-containing tunning and self-control solution：3 mixing are placed in burning
After reacting 3~5min in cup, continue that chitosan-containing tunning quality 10% is added dropwise into beaker under 0 DEG C of condition of ice bath
Caprylyl chloride, continue to mix 1~2h of reaction at being 55~75 DEG C in temperature, reaction produces acylation chitosan after terminating and slightly produced
Thing, acylation chitosan crude product is put into extractor, with 4~6h of acetone extraction, and is dried in vacuo 1~3h, obtains being acylated shell
Glycan powder, it is 1 in mass ratio by glacial acetic acid solution and glutaraldehyde that acylation chitosan powder, mass fraction are 98%：3：1 is mixed
Conjunction is placed in 10~12min of stirring in mixer, and modified self-control chitosan is produced after standing and defoaming；24~36g diatomite is weighed to grind
It is milled after broken 8~10min and crosses 100 mesh sieves, collect sieving powder, is in mass ratio by sieving powder and titanate coupling agent 201
1：2 mix 12~16min, obtain mixture, mixture is put into castor oil and mixing with mixture quality 0.7%
In the fermentation tank of the bed-silt of amount of substance 6%, it is sealed by fermentation 6~8 days under conditions of being 36~40 DEG C in temperature, fermentation ends
Afterwards, tunning is taken out, obtains modification infusorial earth powder；To the reactor equipped with electric mixer, thermometer and reflux
Middle addition 30~40g polyvinyl alcohol and 0.4~0.5L deionized waters mix 1~3h of dissolving, are heated to 90~110
DEG C, 50~60 DEG C are naturally cooling to after 10~15min of insulated and stirred, then 12~16g chitosans, 6~8g are added into reactor
Modification infusorial earth powder, 10~12mL silane coupler KH-560 and 10~12g ambers, continue 1~3h of insulation reaction, produce and change
Property poly-vinyl alcohol solution, modified poly ethylene alcoholic solution is placed on glass culture dish and is cast, natural film forming, dry after discharge, i.e.,
The hydrophobic coated fertilizer of biodegradation type can be made.
Example 1
By waiting mass ratio that shrimp shell and crab shell are mixed into 16min, mixture is obtained, continues to add compounding substances into mixture
The biogas slurry of amount 0.9%, is fitted into fermentation tank, is sealed by fermentation 7 days under conditions of being 32 DEG C in temperature, after fermentation ends, takes out fermentation
Product, as chitosan-containing tunning, then by pyridine and chloroform be 1 by volume：1 mixes 4min, obtains certainly
Solution processed；It is 1 in mass ratio by chitosan-containing tunning and self-control solution：3 mixing are placed in beaker after reaction 3min, 0
DEG C condition of ice bath under continue that the caprylyl chloride of chitosan-containing tunning quality 10% is added dropwise into beaker, in the case where temperature is 55 DEG C
Continue to mix reaction 1h, reaction produces acylation chitosan crude product after terminating, acylation chitosan crude product is put into extraction
In device, with acetone extraction 4h, and 1h is dried in vacuo, obtains acylation chitosan powder, be by acylation chitosan powder, mass fraction
98% glacial acetic acid solution and glutaraldehyde is 1 in mass ratio：3：1 mixing, which is placed in mixer, stirs 10min, after standing and defoaming i.e.
Self-control chitosan must be modified；Weigh after 24g diatomite grinds 8min and cross 100 mesh sieves, sieving powder is collected, by the powder that sieves
It is 1 in mass ratio with titanate coupling agent 201：2 mix 12min, obtain mixture, mixture is put into mixture
In the fermentation tank of the castor oil of quality 0.7% and the bed-silt of mixture quality 6%, sealed under conditions of being 36 DEG C in temperature
Fermentation 6 days, after fermentation ends, tunning is taken out, obtains modification infusorial earth powder；To equipped with electric mixer, thermometer and
30g polyvinyl alcohol is added in the reactor of reflux and 0.4L deionized waters mix dissolving 1h, is heated to 90 DEG C,
50 DEG C are naturally cooling to after insulated and stirred 10min, then 12g chitosans, 6g modification infusorial earths powder, 10mL are added into reactor
Silane coupler KH-560 and 10g amber, continue insulation reaction 1h, modified poly ethylene alcoholic solution is produced, by modified polyvinylalcohol
Solution is placed on glass culture dish and is cast, natural film forming, is discharged after drying, you can the hydrophobic coating material of biodegradation type is made
Material.
Example 2
By waiting mass ratio that shrimp shell and crab shell are mixed into 18min, mixture is obtained, continues to add compounding substances into mixture
The biogas slurry of amount 0.9%, is fitted into fermentation tank, is sealed by fermentation 8 days under conditions of being 37 DEG C in temperature, after fermentation ends, takes out fermentation
Product, as chitosan-containing tunning, then by pyridine and chloroform be 1 by volume：1 mixes 5min, obtains certainly
Solution processed；It is 1 in mass ratio by chitosan-containing tunning and self-control solution：3 mixing are placed in beaker after reaction 4min, 0
DEG C condition of ice bath under continue that the caprylyl chloride of chitosan-containing tunning quality 10% is added dropwise into beaker, in the case where temperature is 65 DEG C
Continue to mix reaction 1.5h, reaction produces acylation chitosan crude product after terminating, acylation chitosan crude product is put into and carried
Take in device, with acetone extraction 5h, and be dried in vacuo 2h, acylation chitosan powder obtained, by acylation chitosan powder, mass fraction
Glacial acetic acid solution and glutaraldehyde for 98% are 1 in mass ratio：3：1 mixing, which is placed in mixer, stirs 11min, after standing and defoaming
Produce modified self-control chitosan；Weigh after 30g diatomite grinds 9min and cross 100 mesh sieves, sieving powder is collected, by the powder that sieves
End and titanate coupling agent 201 are 1 in mass ratio：2 mix 14min, obtain mixture, and mixture is put into mixing
It is close under conditions of temperature is 38 DEG C in the fermentation tank of the castor oil of amount of substance 0.7% and the bed-silt of mixture quality 6%
Seal ferment 7 days, after fermentation ends, tunning is taken out, obtains modification infusorial earth powder；To equipped with electric mixer, thermometer
Dissolving 2h is mixed with addition 35g polyvinyl alcohol in the reactor of reflux and 0.4L deionized waters, is heated to 100
DEG C, be naturally cooling to 55 DEG C after insulated and stirred 13min, then add into reactor 14g chitosans, 7g modification infusorial earths powder,
11mL silane coupler KH-560 and 11g ambers, continue insulation reaction 2h, modified poly ethylene alcoholic solution is produced, by the poly- second of modification
Enolate solution is placed on glass culture dish and is cast, natural film forming, is discharged after drying, you can the hydrophobic coating of biodegradation type is made
Material.
Example 3
By waiting mass ratio that shrimp shell and crab shell are mixed into 20min, mixture is obtained, continues to add compounding substances into mixture
The biogas slurry of amount 0.9%, is fitted into fermentation tank, is sealed by fermentation 9 days under conditions of being 42 DEG C in temperature, after fermentation ends, takes out fermentation
Product, as chitosan-containing tunning, then by pyridine and chloroform be 1 by volume：1 mixes 6min, obtains certainly
Solution processed；It is 1 in mass ratio by chitosan-containing tunning and self-control solution：3 mixing are placed in beaker after reaction 5min, 0
DEG C condition of ice bath under continue that the caprylyl chloride of chitosan-containing tunning quality 10% is added dropwise into beaker, in the case where temperature is 75 DEG C
Continue to mix reaction 2h, reaction produces acylation chitosan crude product after terminating, acylation chitosan crude product is put into extraction
In device, with acetone extraction 6h, and 3h is dried in vacuo, obtains acylation chitosan powder, be by acylation chitosan powder, mass fraction
98% glacial acetic acid solution and glutaraldehyde is 1 in mass ratio：3：1 mixing, which is placed in mixer, stirs 12min, after standing and defoaming i.e.
Self-control chitosan must be modified；Weigh after 36g diatomite grinds 10min and cross 100 mesh sieves, sieving powder is collected, by the powder that sieves
End and titanate coupling agent 201 are 1 in mass ratio：2 mix 16min, obtain mixture, and mixture is put into mixing
It is close under conditions of temperature is 40 DEG C in the fermentation tank of the castor oil of amount of substance 0.7% and the bed-silt of mixture quality 6%
Seal ferment 8 days, after fermentation ends, tunning is taken out, obtains modification infusorial earth powder；To equipped with electric mixer, thermometer
Dissolving 3h is mixed with addition 40g polyvinyl alcohol in the reactor of reflux and 0.5L deionized waters, is heated to 110
DEG C, be naturally cooling to 60 DEG C after insulated and stirred 15min, then add into reactor 16g chitosans, 8g modification infusorial earths powder,
12mL silane coupler KH-560 and 12g ambers, continue insulation reaction 3h, modified poly ethylene alcoholic solution is produced, by the poly- second of modification
Enolate solution is placed on glass culture dish and is cast, natural film forming, is discharged after drying, you can the hydrophobic coating of biodegradation type is made
Material.
Comparative example
With the coated fertilizer of company of Wuhan City production as a comparison case to the hydrophobic coating of biodegradation type produced by the present invention
Coated fertilizer in material and comparative example is detected, and testing result is as shown in table 1：
Degradability：Take present example 1~3 and the coat fertilizer 500kg prepared by comparative example be put into pulverizer it is damaged, so
All dissolve in afterwards in water, by being cleaned multiple times, filter out fertilizer putamina with 2mm sieve, constant weight is dried at 80 DEG C.Weigh up 2g
Putamina and 1kg soil mix, and are cultivated 720 days at 25 DEG C of constant temperature, part putamina are then taken out, using scanning electron microscopic observation putamina
Apparent change before and after placing into the soil.
Table 1
It can be seen from data in table 1, the hydrophobic coated fertilizer fertilizer releasing period length of biodegradation type produced by the present invention, and biology
Degradability is good, environmental protection, safety.Therefore, there is wide prospect of the application.
Claims (5)
1. a kind of preparation method of the hydrophobic coated fertilizer of biodegradation type, it is characterised in that specifically preparation process is：（1）Press
Shrimp shell and crab shell mixed Deng mass ratio, mixture is obtained, continues to add the natural pond of mixture quality 0.9% into mixture
Liquid, it is fitted into fermentation tank, is sealed by fermentation, after fermentation ends, takes out tunning, as chitosan-containing tunning, then by pyrrole
Pyridine and chloroform mix, and obtain making solution by oneself；
（2）Chitosan-containing tunning and self-control solution are mixed and are placed in beaker after reaction, is continued under 0 DEG C of condition of ice bath
The caprylyl chloride of chitosan-containing tunning quality 10% is added dropwise into beaker, continues to mix reaction, reaction produces after terminating
Acylation chitosan crude product, acylation chitosan crude product is put into extractor, with acetone extraction, and is dried in vacuo, obtains acyl
Change Chitosan powder, acylation chitosan powder, the glacial acetic acid solution that mass fraction is 3% and glutaraldehyde are mixed and be placed in mixer
Middle stirring, modified self-control chitosan is produced after standing and defoaming；
（3）Weigh and 100 mesh sieves are crossed after 24~36g diatomite is ground, collect sieving powder, sieving powder and titanate esters is even
Connection agent 201 mixes, and obtains mixture, mixture is put into castor oil and compounding substances with mixture quality 0.7%
In the fermentation tank of the bed-silt of amount 6%, it is sealed by fermentation, after fermentation ends, takes out tunning, obtain modification infusorial earth powder
End；
（4）Added into the reactor equipped with electric mixer, thermometer and reflux 30~40g polyvinyl alcohol and 0.4~
0.5L deionized waters, which mix, to be dissolved, heat temperature raising, Temperature fall after insulated and stirred, then 12~16g is added into reactor
Chitosan, 6~8g modification infusorial earths powder, 10~12mL silane coupler KH-560 and 10~12g ambers, it is anti-to continue insulation
Should, modified poly ethylene alcoholic solution is produced, modified poly ethylene alcoholic solution is placed on glass culture dish and is cast, natural film forming, is dried
After discharge, you can biodegradation type hydrophobic coated fertilizer is made.
A kind of 2. preparation method of the hydrophobic coated fertilizer of biodegradation type according to claim 1, it is characterised in that：Step
Suddenly（1）Described mixing time is 16~20min, and fermentation temperature is 32~42 DEG C, and fermentation time is 7~9 days, pyridine and trichlorine
The volume ratio of methane is 1：1, the mixing time is 4~6min.
A kind of 3. preparation method of the hydrophobic coated fertilizer of biodegradation type according to claim 1, it is characterised in that：Step
Suddenly（2）Described chitosan-containing tunning and the mass ratio of self-control solution are 1：3, the reaction time is 3~5min, stirring reaction
Temperature is 55~75 DEG C, and the stirring reaction time is 1~2h, and extraction times are 4~6h, and drying time is 1~3h, acylation chitosan
The glacial acetic acid solution and the mass ratio of glutaraldehyde that powder, mass fraction are 98% are 1：3：1, mixing time is 10~12min.
A kind of 4. preparation method of the hydrophobic coated fertilizer of biodegradation type according to claim 1, it is characterised in that：Step
Suddenly（3）The described time that grinds is 8~10min, and the mass ratio of sieving powder and silane coupler is 1：2, mix
Time is 12~16min, and fermentation temperature is 36~40 DEG C, and fermentation time is 6~8 days.
A kind of 5. preparation method of the hydrophobic coated fertilizer of biodegradation type according to claim 1, it is characterised in that：Step
Suddenly（4）The described stirring and dissolving time is 1~3h, and heat temperature raising temperature is 90~110 DEG C, the insulated and stirred time is 10~
15min, cooling temperature is 50~60 DEG C, and the insulation reaction time is 1~3h.
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| CN201711161990.7A CN107793228A (en) | 2017-11-21 | 2017-11-21 | A kind of preparation method of the hydrophobic coated fertilizer of biodegradation type |
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| CN108546521A (en) * | 2018-03-28 | 2018-09-18 | 杨帮燕 | A kind of preparation method of heat-resistant moisture-proof type tape |
| CN114133043A (en) * | 2021-12-21 | 2022-03-04 | 哈尔滨工业大学 | Preparation method and application of slow-release carbon source material |
| US11639319B2 (en) | 2020-08-27 | 2023-05-02 | Instituto De Ecologia, A.C. | Particles of fertilizers encapsulated in modified chitosan and obtaining method |
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| CN108546521A (en) * | 2018-03-28 | 2018-09-18 | 杨帮燕 | A kind of preparation method of heat-resistant moisture-proof type tape |
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