CN102924176A - Sustained oxygen release fertilizer and preparation method thereof - Google Patents
Sustained oxygen release fertilizer and preparation method thereof Download PDFInfo
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- CN102924176A CN102924176A CN201210472172XA CN201210472172A CN102924176A CN 102924176 A CN102924176 A CN 102924176A CN 201210472172X A CN201210472172X A CN 201210472172XA CN 201210472172 A CN201210472172 A CN 201210472172A CN 102924176 A CN102924176 A CN 102924176A
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Abstract
The invention discloses a sustained oxygen release fertilizer which adopts a mixture comprising calcium superoxide, sodium bentonite and polyvinyl formal. The mass ratio of sodium bentonite to calcium superoxide is 12 to 5, and the mass of the polyvinyl formal is 15 percent of the gross mass of the sustained oxygen release. The sustained oxygen release fertilizer discusses the oxygen release feature and the pH value variation in the condition of aqueous medium. Experimental results show that compared with applying calcium superoxide powder only, the sustained oxygen release fertilizer has the characteristics that the fertilizer effect period is long, the applying method is simple, the production technology is simple, the source of material selected is wide, the material is environmentally friendly, and the sustained oxygen release fertilizer can be widely applied.
Description
Technical field:
The present invention relates to agricultural, that woods is used slow controlled release oxygen fertilizer and preparation field thereof, especially a kind of slow control is good, fertilizer efficiency period is long, bioavailability is high, environmentally friendly, Novel oxygen fertilizer of oxygen and preparation method thereof is provided with being the long-time slow controlled release such as water logging plant.
Background technology:
China is the East Asian monsoon sex climate, and unsettled weather system is arranged, and rainfall is seasonal, regional changes is large; The pressure of long-term population growth and society, Economic development, the contradiction of having aggravated man and nature so that China to flood damage caused by waterlogging evil environment more dangerous, east China, middle area are particularly serious.The wet injury of China distributes wide, have wet injury in various degree on about 2/3 area, and loss is serious.According to 1950-1990 data statistics, China every year on average flood area reaches 8,140,000 hectares, 4,480,000 hectares of Disaster Areas, about 2,800,000,000 kilograms of loss grain, hundred million yuan of direct economic loss 100-200; Easily waterlogging easily has 5,400,000 hectares in the stain arable land in 2,147 ten thousand hectares of arable lands, the Yangtze valley, accounts for 25.15%; There is nearly 1,000 ten thousand hectares of waterlogging stain ground in south 14 provinces (city, district), account for 86% of all kinds of middle-and-low-yielding fields of local area, and the waterlogging stain ground of administering through in various degree (great majority are administered for preliminary) only accounts for 31% of waterlogging stain ground sum.Flood causes soil moisture excessive, and there is the mutually relation of restriction in the content of the moisture in the soil and oxygen, and moisture is excessive, has substituted the oxygen in the soil, so that oxygen lacks, this is the key point of plant generation damage or crop failure caused by waterlogging just.Waterlogging causes the plant rhizosphere oxygen concentration to reduce and all Hypoxia Stress and the anaerobic stress state that form, has affected the metabolism of plant normal physiological and grows.In order to adapt to or to alleviate the injury that waterflooding brings, a series of waterlogging reaction can occur in plant materials, has both comprised the temporary transient change of metabolism and genetic expression, also comprises long-term developmental response and metamorphosis.The complexity that waterflooding is suitable on the impact of plant comprises: the accumulation of the generation of the inhibition of the inhibition of energy metabolism, photosynthetic, respiratory inhibition, moisture and nutrition absorption, the change of hormonal readiness, oxygen and the variation of antioxidant system, meta-bolites and toxic action, the increase of osmotic adjustment, the generation of anaerobic protein, the transmission of signal etc.
Demand urgently at present determining reliably, damage or crop failure caused by waterlogging is identified physiological and biochemical index and releasing approach intuitively: by to the waterlogging-resistant gene cloning of forest, build water conservancy projects, the method such as in time water drainage, its effect or not obvious is to solving the plant anoxic still less than very large effect.To introduce a completely new concept from a brand-new angle in this research topic, and start with from the necessary fertilizer of plant-growth, a kind of novel slow controlled release oxygen is fertile.Oxygen fertilizer is the abbreviation of oxygen fertilizer, and is more stable under the drying regime, runs into the slowly fertilizer of releasing oxygen of water, and the oxygen supply thing is superoxide normally.Existing oxygen fertilizer mainly is directly using of calcium peroxide, it is mainly used in some trace of among a small circle agricultural planting (germinateing such as seed growth), aquaculture, food fresh keeping etc. and uses, and because calcium peroxide is met the water releasing oxygen, generating calcium hydroxide makes pH value of water solution up to 12-13, the water logging plant directly used to have a strong impact on soil pH, cause the soil glue to harden and salinification, corrode the root of plant, thereby have influence on the normal growth of plant.Simultaneously, directly using of calcium peroxide can not be played a slowly effect of control releasing oxygen, and the fertilizer conservation performance is undesirable, is difficult to control consumption in the actual application, can not rationally evenly distribute, and is not suitable for promoting on a large scale.
Other many studies show that, the current effective rate of utilization of China's inorganic fertilizer is 30%～35% only, has caused serious financial loss and environmental pollution.Therefore improve chemical fertilizer utilization ratio, alleviate it to the pollution of environment, develop sustainable efficient agricultural and already become the common problems of concern in various countries.Since 20 century 70s, the development and application of slow-release or control-release fertilizer is for addressing the above problem the thinking that provides brand-new, slow-release or control-release fertilizer can effectively control nutrient release, prolong fertilizer efficiency period, satisfy crop whole breeding time to the needs of fertilizer nutrient, can improve to greatest extent fertilizer utilization ratio, reduce the wasting of resources and environmental pollution, to promoting agroforestry volume increase, increasing peasant income, agroforestry Sustainable development important role, it is the important development direction of 21 century fertilizer industry.At present, the inorganic fertilizer total amount consumed in whole world every year is 11,000 ten thousand t, and coating slow-release or control-release fertilizer consumption is less than 500,000 t, major cause is that the sustained-controll-release fertiliser cost is too high, be 2～6 times of general fertilizers, if can improve emphatically the production technology process and methods for using them, seek cheap slow controlled-release material, further reduce the fertiliser production cost, sustained-controll-release fertiliser must have the huge market space so.In this invention, the clay mineral of choosing meets the requirement in current fertilizer market just, its wide material sources, cheap, the synergism of wilkinite fertilizer also be confessed (Hunan Prov. Inst. of Geology is virgin dive bright, Yang Huimin, the high professional researchist of the muddy quiet farm Sun Shu in Hunan, in paddy rice, cotton, rape has been done the application test of wilkinite fertilizer, the result shows the obvious volume increase of having applied of wilkinite fertilizer, synergism), clay mineral is agriculturally used comparatively extensive, wilkinite is a kind of extraordinary modifying agent, and it can change consolidating in the soil, liquid, the ratio of gas has the chessom structure, water conservation, the advantages such as fertilizer conservation.
Therefore strengthen the research of slow-release or control-release fertilizer controlled release mechanism and technology, exploitation meets in the world the novel sustained-controll-release fertiliser of " slow, fluidization, Composite, customizations, high efficiency " development trend, and the loss that the solution flood is produced agroforestry has great meaning.
Summary of the invention:
It is extensive to the purpose of this invention is to provide a kind of material source, environmental friendliness, and fertilizer efficiency period is long, the mode that applies is easy, production technique is simply delayed controlled release oxygen fertilizer and preparation method thereof.
The technical scheme that realizes the foregoing invention purpose is as follows:
A kind of slow controlled release oxygen is fertile, and it is the mixture that comprises calcium peroxide, sodium bentonite and polyvinyl formal; The mass ratio of described sodium bentonite and calcium peroxide is 12:5, and polyvinyl formal content accounts for 15% of the fertile total mass of slow controlled release oxygen.
The preparation method of described slow controlled release oxygen fertilizer may further comprise the steps:
(1) calcium peroxide powder and the sodium bentonite of getting respective quality are fully pulverized mixing;
(2) add the polyvinyl formal solution mixing of corresponding proportion in the mixture, make softwood;
(3) room temperature was placed after 2-3 hour, was squeezed into small-particle;
(4) with compression moulding after the small-particle baking;
(5) natural moisture absorption namely gets the fertile sample of slow controlled release oxygen.
Being squeezed into small-particle in the step (3) is to push by 8～10 mesh sieves.
That small-particle is toasted 30min in 50～60 ℃ in the step (4).
The condition of natural moisture absorption is natural moisture absorption 12h under humidity 80% condition in the step (5).
The pre-treating process of described sodium bentonite is: after sodium bentonite is adopted wet purification, make the mass content of montmorillonite wherein between 30%-80%, and cross the 0.025mm sieve, then be placed in the baking oven, dry by the fire 2h under 105 ℃ of conditions, take out for subsequent use.
Described polyvinyl formal solution preparation method is: take by weighing the 5g polyvinyl alcohol and place glass beaker, add 100mL deionized water and 5mL formaldehyde, then stir 10min on magnetic stirring apparatus, make it even, put into thermostat water bath, heating up gradually makes it dissolving, and constantly stirs again; Under 80 ℃ of constant temperatures, keep 30min to get final product.
The present invention has the following advantages:
1, provides oxygen for the water logging plant: remove waterflooding plant rhizosphere oxygen concentration and reduce all Hypoxia Stress and the anaerobic stress state that causes, keep the metabolism of plant normal physiological and grow, thereby reduce the financial loss that flood causes China's agroforestry.
2, fertilizer efficiency period is long: this novel slow controlled release oxygen fertilizer is relatively novel, innovation in material processing, also is the trend that modern sustained-controll-release fertiliser is produced, and has the very large market space; Find that by solution culture the oxygen time that puts of this novel slow controlled release oxygen fertilizer is sustainable nearly one month in addition, direct use calcium peroxide can not damage plant relatively now, and it is longer to put the oxygen time, and it is more stable to put the oxygen amount.
3, material source is extensive, and is cheap, environmental friendliness: China's clay mineral aboundresources, clay mineral are agriculturally used also comparatively extensive, and wilkinite is a kind of extraordinary modifying agent.The ratio that it can change the solid, liquid, gas in the soil has the advantages such as chessom structure, water conservation, fertilizer conservation, can not cause soil compaction.
4, production technique is simple, easy and simple to handle: the apparatus for preparation of this novel slow controlled release oxygen fertilizer is simple, easy and simple to handle, and production environment requires not harsh, pass into hot blast in the process, keep whole manufacturing environment drying to get final product (calcium peroxide discharges the oxygen demand drying because running into water environment).The present invention had both simplified the operation of the technological process of production, had improved again production efficiency, had reduced production cost, had saved the production space, had saved the energy, without any disposal of pollutants.
Description of drawings
Fig. 1 is for drawing oxygen accumulative total stripping quantity and the relation curve of water logging time;
As seen from Figure 1, whole duration of test, the water planting contrast is in the lower oxygen water gaging that soaks always to be put down, and the variation tendency that the calcium peroxide water planting is soaked the oxygen amount is the rear decline of rising first, soaks the oxygen amount and reaches the peak in the 12nd day, then transfer to rapidly and descending, the oxygen release amount of slowly-releasing oxygen fertilizer in water planting continued to remain on about 32 days, and its curve is more mild lasting than calcium peroxide, the phenomenon that does not occur violent release in the process and reduce rapidly, can play slow releasing oxygen, the effect of oxygen is provided for the water logging plant.
Fig. 2 is for drawing pH value and the relation curve of water logging time.
As seen from Figure 2, in the whole process of the test, the pH value of water planting contrast remains on 7 level always, and the pH value of calcium peroxide remains on very high strong basicity level.And the pH value of slowly-releasing oxygen fertilizer is in the lower level of pH value＜8 and very stable always, the acid-basicity that can not change soil that applies of a small amount of slowly-releasing oxygen fertilizer is described, add the regulating power of soil overall situation self, can not cause soil compaction, affect plant normal growth.
Embodiment
Be intended to further specify the present invention below in conjunction with embodiment, and unrestricted the present invention.
The fertile preparation technology's of the slow controlled release oxygen of the present invention optimization
1, wilkinite performance perameter
With the weighting agent of calcium base original ore soil, calcium-base bentonite and the preparation of sodium bentonite as fertilizer sources, according to the GB detection method, bentonitic fundamental performance parameter to be inhaled blue amount, expansion capacity, colloid index and cation exchange capacity detect, detected result sees Table 1
Table 1 experiment wilkinite fundamental performance parameter
Inhale blue measuring: montmorillonite is scattered in the aqueous solution, has the ability of adsorption of methylene indigo plant, and the amount of its absorption is called as the blue amount of inhaling, and methylene blue milligramequivalent number or the grams of adsorbing with 100 gram samples represent.Smectite content is higher, inhales blue amount the more, therefore, inhales the key technical indexes that blue amount can be used as windshield appraisal montmorillonite relative content.
Expansion capacity: bentonitic expansion character represents that with expansion capacity the volume after wilkinite expands is called expansion capacity, represents with a ml/g sample in dilute hydrochloric acid solution.By as seen from Table 1, sodium bentonite is higher than the expansion capacity of calcium base original ore soil and calcium-base bentonite.The wilkinite of same genotype contains montmorillonite the more, and expansion capacity is higher.Expansion capacity is one of technical indicator of identifying wilkinite ore genotype and appraisal wilkinite quality.
Colloid index: after wilkinite and water are mixed in proportion, add an amount of magnesium oxide, make the volume of the gelinite of its cohesion formation, be called colloid index, represent with 15 milliliter numbers that restrain the gel volume of samples formation.Colloid index shows that the sample particle disperses and extent of hydration, is dispersiveness, wetting ability and expansile general performance, and genotype and the smectite content of its size and bentonite ore are closely related.By as seen from Table 1, sodium bentonite is higher than the colloid index of calcium base raw ore, calcium-base bentonite.The wilkinite of same genotype contains montmorillonite the more, and colloid index is higher.So colloid index is one of technical indicator of identifying wilkinite ore genotype and appraisal wilkinite quality.
Cation exchange capacity refers to the K that adsorbs under pH value is 7 condition
+, Na
+, Ca
2+, Mg
2+Etc. cationic total amount, referred to as CEC.Bentonite ore cation exchange capacity and exchangeable cation are the Main Basiss of judging the bentonite ore quality and dividing the bentonite ore genotype, and larger its electronegative amount of expression of CEC value is larger, and its aquation, expansion and dispersive ability are stronger; Otherwise, a little less than its aquation, expansion and dispersive ability heal.
As can be drawn from Table 1,4 kinds of fundamental performance parameters of sodium bentonite obviously are better than calcium base original ore soil and calcium-base bentonite, illustrate that the montmorillonite relative content is higher in the sodium bentonite, ore genotype and quality are better, aquation, expansion and dispersive ability are stronger, this shows, select sodium bentonite as fertilizer sources weighting agent proper.
The result
The wilkinite type is on the impact of oxygen fertilizer slow-release effect
The weighting agent for preparing with calcium base original ore soil, calcium-base bentonite and sodium bentonite as fertilizer sources respectively, compare 12:5 at clay fertilizer, the polyvinyl formal consumption is that the slow controlled release oxygen of preparation is fertile under 15% the condition, in Lentic environment, carry out the stripping experiment, investigate different types of wilkinite fertilizer controlled release is put the impact of performance, detected result sees Table 2
Oxygen leaching amount during the fertile 25 ℃ of hydrostatic of the slow controlled release oxygen of the dissimilar wilkinites of table 2 are cultivated
As can be seen from Table 2: in hydrostatic stripping environment, slow release effect is sodium bentonite and calcium-base bentonite preferably, calcium base original ore soil effect is relatively poor, this mainly is because contain more sand grains and other impurity in the calcium base original ore soil, cause bentonitic quality to descend, be unfavorable for that the oxygen unit that contains of calcium peroxide enters the slowly-releasing composition that bentonitic interlayer structure forms fertilizer.The sodium bentonite grade wants high than calcium-base bentonite, and it is good to have a structure dispersing property, the advantage that the ionic adsorption performance is strong, thereby have better slow release effect.Therefore, select sodium bentonite to carry out subsequent experimental.
The impact of clay fertilizer comparison fertilizer slow release effect
Take sodium bentonite as weighting agent, wilkinite quality: calcium peroxide quality: the polyvinyl formal mass ratio is respectively 12:5:3,10:7:3,8:9:3 prepares slow-release or control-release fertilizer, carry out stripping experiment in Lentic environment, that investigates clay fertilizer comparison fertilizer slow release performance affects that oxygen content sees Table 3 in the Lentic environment
Oxygen leaching amount during the different clay fertilizers of table 3 are cultivated than 25 ℃ of hydrostatic of slow-release fertilizer
As can be seen from Table 3, the fertile oxygen content of slow controlled release oxygen of the first seven day is the trend that increases gradually along with reducing of clay fertilizer ratio, when reaching capacity, water oxygen gas concentration descends rapidly, the calcium peroxide of namely sneaking into increases, under identical culture condition, the oxygen of its stripping state that can reach capacity at short notice then reduces rapidly.Illustrate when calcium peroxide content in the slow-release fertilizer to increase to when a certain amount of, excessive calcium peroxide can not active adsorption on the wilkinite carrier, easily gone out by water-soluble, and along with the increase of calcium peroxide amount, the pH value of solution also can raise, the growth of plant is threatened.Therefore when the preparation slow-release or control-release fertilizer, should select suitable clay fertilizer ratio, make it can satisfy plant growth to the demand of oxygen, can give full play to again wilkinite to the slow releasing function of oxygen fertilizer.Under this experiment condition, select suitable clay fertilizer than being 12:5.
Polyvinyl formal content is on the impact of oxygen fertilizer slow-release effect
Take sodium bentonite as weighting agent, clay fertilizer is than being 12:5, be respectively 5%, 10%, 15%, 20%, 25% by polyvinyl formal content and prepare respectively slow-release fertilizer, in Lentic environment, carry out stripping the effects polyvinyl formal content to the impact of fertilizer slow release performance.Oxygen content sees Table 4 in the Lentic environment,
Oxygen leaching amount during the fertile 25 ℃ of hydrostatic of the different polyvinyl formal content of table 4 slowly-releasing oxygen are cultivated
As can be seen from Table 4: at 1～20 day, when polyvinyl formal content is 5%, 10%, 15%, the oxygen leaching amount of slow controlled release oxygen fertilizer in hydrostatic is cultivated reduces along with the increase of polyvinyl formal content, rear 12 days, the oxygen leaching amount of slow controlled release oxygen fertilizer in hydrostatic is cultivated increases along with the increase of polyvinyl formal content, be that polyvinyl formal content is higher, the sustained release performance of fertilizer is better, and the effective rate of utilization of oxygen fertilizer is higher.But when the polyvinyl formal consumption was increased to 20% and 25%, difference was not remarkable, considered technical and economy, and selecting the Optimum Contents of polyvinyl formal is 15%.
Conclusion
With the sodium bentonite of the natural cheapness weighting agent as calcium peroxide, add again the polyvinyl formal tackiness agent, the novel slow controlled release oxygen of preparation is fertile.
(1) the wilkinite type has certain impact to the sustained release performance of slowly-releasing oxygen fertilizer, and the sodium bentonite grade wants high than calcium-base bentonite and calcium base original ore soil, and it is good to have a structure dispersing property, the advantage that the ionic adsorption performance is strong, thereby have better slow release effect.
(2) when the clay fertilizer ratio is respectively 12:5,10:7,8:9, along with the increase of clay fertilizer ratio, the oxygen content of slow controlled release oxygen fertilizer is the trend of increase, and namely the ratio that accounts for of wilkinite is larger, and the sustained release performance of slow-release or control-release fertilizer is better, and the effective rate of utilization of oxygen fertilizer is just higher.
(3) when polyvinyl formal is respectively 5%, 10%, 15%, 20%, 25% with content, consider technical and economy, selecting the Optimum Contents of polyvinyl formal is 15%.
(4) take sodium bentonite as weighting agent, clay fertilizer is than being 12:5, and polyvinyl formal content is that the slow release effect of prepared novel slow controlled release oxygen fertilizer is best under 15% the condition.
The instrument that adopts:
H18424 type electronic balance
FW135 type crusher for Chinese herbal medicine
TDP-1.5 type electric tablet machine
HPX-150BS type whizzer
101-3-BS type electric heating constant-temperature blowing drying box
SX725 type pH/mV dissolved oxygen sensing instrument
Step:
(1) pre-treatment of sodium bentonite: after sodium bentonite employing wet purification, make the mass content of montmorillonite wherein between 30%-80%, and cross 0.025mm and sieve, made required sodium bentonite, then sodium bentonite is placed baking oven, under 105 ℃ of conditions, dry by the fire 2h, take out for subsequent use.
(2) polyvinyl formal solution preparation: take by weighing the 5g polyvinyl alcohol and place glass beaker, add 100mL deionized water and 5mL formaldehyde, then on magnetic stirring apparatus, stir 10min, make it even, put into thermostat water bath, heating up gradually makes it dissolving, and constantly stirs again; Under 80 ℃ of constant temperatures, keep 30min to get final product, for subsequent use.
(3) mass ratio according to sodium bentonite and calcium peroxide is 12:5, gets calcium peroxide powder and the sodium bentonite of respective quality and fully pulverizes mixing; Account for 15% of the fertile total mass of slow controlled release oxygen by polyvinyl formal content, add the polyvinyl formal solution mixing of corresponding proportion in the mixture, make softwood;
(4) room temperature was placed after 2-3 hour, was squeezed into small-particle by 8～10 mesh sieves;
(5) with compressing tablet behind the baking 30min in 50～60 ℃ of the small-particles;
(6) natural moisture absorption 12h under humidity 80% condition namely gets the fertile sample of slow controlled release oxygen.
The fertile performance evaluation of novel slow controlled release oxygen
1, adopts the fertile vat liquor of the standby novel slow controlled release oxygen of stripping quantity legal system in the water
Take by weighing the about 2g of the fertile particle of oxygen, be put in the homemade 300 order filter cloth bags, filter cloth bag is placed 250ml ground Erlenmeyer flask, add 250ml distilled water, again Erlenmeyer flask being put into 25 ℃ of constant incubators cultivates, extract the sub-fraction vat liquor at the 1d, the 3d that cultivate, 5d, 7d, 10d, 15d, 20d, 25d, 30d, 32d respectively, in Erlenmeyer flask, add isopyknic distilled water after the extraction vat liquor, continue cultivation, lixiviate.
2, the mensuration of oxygen content in the vat liquor
Vat liquor is measured the content of oxygen in the filtrate after the middling speed qualitative filter paper filters, draw oxygen accumulative total stripping quantity and the relation curve of water logging time.Every group of experiment repeats 3 times and carries out replicate(determination).Measure in strict accordance with SX725 type pH/mV dissolved oxygen sensing instrument working specification, the content and the temperature that it should be noted that water oxygen gas are negative correlation, temperature is very large to the content influence of water oxygen, so will set a unified reference standard temperature when measuring, this experiment is the data that measure under 25 ℃.
Claims (7)
1. a slow controlled release oxygen is fertile, it is characterized in that it is the mixture that comprises calcium peroxide, sodium bentonite and polyvinyl formal; The mass ratio of described sodium bentonite and calcium peroxide is 12:5, and polyvinyl formal content accounts for 15% of the fertile total mass of slow controlled release oxygen.
2. the preparation method of slow controlled release oxygen fertilizer claimed in claim 1 is characterized in that, may further comprise the steps:
(1) calcium peroxide powder and the sodium bentonite of getting respective quality are fully pulverized mixing;
(2) add the polyvinyl formal solution mixing of corresponding proportion in the mixture, make softwood;
(3) room temperature was placed after 2-3 hour, was squeezed into small-particle;
(4) with compression moulding after the small-particle baking;
(5) natural moisture absorption namely gets the fertile sample of slow controlled release oxygen.
3. the preparation method of slow controlled release oxygen fertilizer according to claim 2 is characterized in that, being squeezed into small-particle in the step (3) is to push by 8～10 mesh sieves.
4. the preparation method of slow controlled release oxygen fertilizer according to claim 2 is characterized in that, is that small-particle is toasted 30min in 50～60 ℃ in the step (4).
5. the preparation method of slow controlled release oxygen fertilizer according to claim 2 is characterized in that, the condition of natural moisture absorption is natural moisture absorption 12h under humidity 80% condition in the step (5).
6. the preparation method of slow controlled release oxygen fertilizer according to claim 2, it is characterized in that, the pre-treating process of described sodium bentonite is: after sodium bentonite is adopted wet purification, make the mass content of montmorillonite wherein between 30%-80%, and cross 0.025mm and sieve, then be placed in the baking oven, under 105 ℃ of conditions, dry by the fire 2h, take out for subsequent use.
7. the preparation method of slow controlled release oxygen fertilizer according to claim 2, it is characterized in that, described polyvinyl formal solution preparation method is: take by weighing the 5g polyvinyl alcohol and place glass beaker, add 100mL deionized water and 5mL formaldehyde, then on magnetic stirring apparatus, stir 10min, make it evenly to put into again thermostat water bath, heating up gradually makes it dissolving, and constantly stirs; Under 80 ℃ of constant temperatures, keep 30min to get final product.
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| CN103204737A (en) * | 2013-03-27 | 2013-07-17 | 邬金飞 | Mushroom breeder seed culture material and preparation method thereof |
| CN103435111A (en) * | 2013-08-26 | 2013-12-11 | 上虞洁华化工有限公司 | Calcium peroxide oxygenating agent particles and manufacturing method thereof |
| CN103819269A (en) * | 2014-02-20 | 2014-05-28 | 中国科学院烟台海岸带研究所 | Slow release method using organic clay as matrix |
| CN103819269B (en) * | 2014-02-20 | 2016-01-13 | 中国科学院烟台海岸带研究所 | A kind of take organic clay as the release method of matrix |
| CN105802634A (en) * | 2016-04-13 | 2016-07-27 | 湖南省土壤肥料研究所 | Slow-release oxidant with calcium peroxide as substrate and paraffin as wrapping film and preparation method |
| CN105860980A (en) * | 2016-04-13 | 2016-08-17 | 湖南省土壤肥料研究所 | Slow release oxidant adopting calcium peroxide as matrix and polyethylene as coating film, and preparation method thereof |
| CN105885861A (en) * | 2016-04-13 | 2016-08-24 | 中国科学院亚热带农业生态研究所 | Slow-release oxidizing agent with calcium peroxide as matrix and epoxy resin as envelopes and preparation method |
| CN105907400A (en) * | 2016-04-13 | 2016-08-31 | 中国科学院亚热带农业生态研究所 | Slow release oxidant adopting calcium peroxide as matrix and nanometer organic bentonite as coating film, and preparation method thereof |
| CN106146174A (en) * | 2016-08-10 | 2016-11-23 | 安徽省陆虎生物科技有限公司 | A kind of oxygen supplement coated fertilizer overcoming production continuous cropping obstacle |
| CN106747941A (en) * | 2016-11-21 | 2017-05-31 | 重庆市江津区森德家庭农场 | A kind of controlled release oxygenation agent for stock growing and preparation method thereof |
| CN106747948A (en) * | 2016-11-23 | 2017-05-31 | 重庆市江津区森德家庭农场 | A kind of nursery stock oxygenation fertilizer and preparation method thereof |
| CN106701099A (en) * | 2016-12-29 | 2017-05-24 | 上海梵坤环保科技发展有限公司 | Soil conditioner and preparation method thereof |
| CN106748262A (en) * | 2017-01-19 | 2017-05-31 | 许美凤 | A kind of paddy field anti-corrosion root paddy rice slow-release fertilizer and preparation method thereof |
| CN108607483A (en) * | 2018-04-28 | 2018-10-02 | 汉广中药科技（天津）有限公司 | A kind of Chinese medicine curing agent with oxygen slow release function and preparation method thereof and application method |
| CN111084062A (en) * | 2019-10-11 | 2020-05-01 | 湖南农业大学 | Method for improving waterlogging resistance of rape |
| CN114106838A (en) * | 2021-11-26 | 2022-03-01 | 江西师范大学 | Large-particle cadmium passivation material with calcium bentonite as substrate and preparation method thereof |
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