CN109705717A - A kind of coating composition, preparation method and its usage - Google Patents
A kind of coating composition, preparation method and its usage Download PDFInfo
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- CN109705717A CN109705717A CN201910028940.4A CN201910028940A CN109705717A CN 109705717 A CN109705717 A CN 109705717A CN 201910028940 A CN201910028940 A CN 201910028940A CN 109705717 A CN109705717 A CN 109705717A
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Abstract
The present invention provides a kind of coating compositions, especially a kind of coating composition containing sulfur dioxide releasing agent, wax, adhesive and dispersing agent, the mass ratio of sulfur dioxide releasing agent and hydrophobic additives is 5 ~ 200:1, and hydrophobic additives contain magnesium stearate, one or two kinds of in calcium stearate.The present invention solves the technical problems such as be not easy to disperse, particle is easily agglomerated using wax and adhesive as decentralized medium, using sulfur dioxide releasing agent as the coating composition of effective component, substantially shortens coating composition process time.
Description
Technical field
The present invention relates to fruit freshness preserving technical fields, more specifically, in particular to a kind of coating composition, preparation method
And it is used to prepare the purposes of fresh keeping pad for fruit.
Background technique
Grape is one of important fruit variety in China, deep to be liked by the people.According to statistics, end the end of the year in 2015, Chinese Portugal
Grape cultivated area is close to 12,000,000 mu, and 1366.9 ten thousand tons of yield, Table Grape yield was sure to occupy first place in the world from 2011, from
Vinegrowing area has leapt to second place of the world from 2014, and vintage occupies the 8th, the world, and China has become the world
Grape big producer.According to statistics, due to adopting the influence of rear transportation fresh-retaining factor, loss up to 15% ~ 25% after grape harvest.
At present both at home and abroad extensively using sulfur dioxide as antistaling agent for grape, sulfur dioxide inhibits because it is with reproducibility
The activity of oxidizing ferment and microorganism slows down putrid and deteriorated fruit, discoloration and the loss of Vc, to can reach fresh-keeping purpose.Two
Sulfur oxide fresh-keeping mat is a kind of conventional products in fruit post-harvest fresh-keeping industry, and the deep welcome by wide farmers is especially protected in grape
On fresh, sulfur dioxide fresh-keeping mat is widely applied.But the burst size of sulfur dioxide and rate of release are difficult to control, it is excessive
Phytotoxicity can be generated, lead to problems such as fruits and vegetables bleaching, residual quantity exceeded.
Grape is in logistics progress, it is difficult to the suitable preservation and freshness item such as relatively stable temperature, gas, humidity
Part, conventional mesh sulfur dioxide fresh-keeping mat (1279020 A of patent CN, CN102894072 A, CN2481520 Y,
CN1760446 A) in application, sulfur dioxide rate of release is difficult to control.In recent years using the dioxy of coating complex method production
It is more and more to change sulphur fresh-keeping mat, it is effective component that the type fresh-keeping mat, which mostly uses pyrosulfite, sulphite, and blended wax is glued
The additives such as mixture, are made up of coating method.CN 104621241A discloses one kind by antistaling agent, substrate and adhesive group
At antistaling paper for grapes, antistaling agent includes pyrosulfite or bisulfite, sustained release agent, quick-release agent, filler；It processes work
Skill be heating scrape rifle coating method be coated it is compound.
CN104553204A discloses a kind of tin foil being made of substrate layer, coating layer and controlled release coating, using molten
Melt coating fluid and dissolution coating fluid, is coated with by Special coating equipment.106720237 A of Chinese patent CN discloses use
The sulfur dioxide fresh-keeping mat of two sections of release made of thermal coating combination process, the invention is by sulfur dioxide releasing agent and wax, ethylene-
Vinyl acetate resin melting mixing is uniform, is in a heated state the preferable fluid of mobility, is then coated on substrate,
Fresh-keeping mat is made.
In the processing of sulfur dioxide fresh-keeping mat, it is processed into coating fluid by decentralized medium of solid wax, sulfur dioxide releasing agent
Granule size influences Painting effect, and grain graininess is easy greatly blocking strainer and coating head, and solid particle fineness is smaller in coating fluid
It is better, but grain fineness is smaller, the problem of reunion again there is also difficulties in dispersion or little particle.
Summary of the invention
It is an object of the present invention to provide a kind of coating composition, be provided in particular in it is a kind of containing sulfur dioxide releasing agent, wax,
The coating composition of adhesive and dispersing agent, solves and is as decentralized medium, with sulfur dioxide releasing agent using wax and adhesive
The technical problems such as grain fineness existing for the coating composition of effective component is big, be not easy to disperse, particle easily agglomerates.
Another object of the present invention is to provide the preparation method of the coating composition.
Another object of the present invention is to provide the purposes of the coating composition, is used to prepare fresh keeping pad for fruit.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of coating composition, containing sulfur dioxide releasing agent, wax, adhesive and hydrophobic additives, the sulfur dioxide
The mass ratio of releasing agent and hydrophobic additives is 5 ~ 200:1；
The hydrophobic additives contain odium stearate, magnesium stearate, one or two kinds of in calcium stearate；The hydrophobic dispersion
Agent is preferably magnesium stearate.
The sulfur dioxide releasing agent is sodium pyrosulfite, in potassium metabisulfite, sodium hydrogensulfite, potassium bisulfite
It is one or more of.The most commonly used with sodium pyrosulfite, quality is stablized.The coke of the preferred food additive grade of sulfur dioxide releasing agent is sub-
Sodium sulphate.
The hydrophobic additives can also contain silica.
The composition 60 ~ 150 DEG C melting and it is flowable, be lower than 50 DEG C under the conditions of be solid-state.And two in composition
Sulfur oxide releasing agent particle is uniformly dispersed, without cohesion, is suspension system in molten condition.
The wax is solid wax of the fusing point less than 100 DEG C, and the optional type of wax has very much, can be semi-refined wax, essence
Wax, microwax etc. are refined, wax fusing point is also to be very easy to detection, and in the selection of wax, preferential selection can satisfy food safety
The wax of standard.For solid wax as main dispersing medium, effect increases the flowing of medicament in a heated state first is that diluting effect
Property, it is easy to be coated with, second is that reducing the rate of release of sulfur dioxide, plays the role of sustained release.
The solid wax fusing point preferably≤80 DEG C.
Described adhesive is selected from ethylene-vinyl acetate resin, polyvinyl resin, thermoplastic polyurethane elastomer, polypropylene
One or more of resin.The melting point of described adhesive or softening point temperature≤120 DEG C.
The ethylene-vinyl acetate resin is also referred to as ethylene vinyl acetate polymer, EVA resin.The ethyl vinyl acetate
Content >=28% of vinylacetate in vinylester resin.The melting temperature of EVA, usually can be according to the side of industry ASTM D3418
Method or the test of 3416 method of ISO, melting temperature≤100 DEG C of ethylene-vinyl acetate resin of the present invention.
Polyvinyl resin, acrylic resin are relatively conventional resin, common plastics industry.Thermoplastic polyurethane elastic
Body, also known as TPU, for adhesive etc..
It is compatible with effective component, do not send out first is that play adhesive effect in the present solution, adhesive plays the role of three aspects
Raw reaction can carry out efficient melting mixing with wax；Second is that resin ratio is added as the sustained release agent for slowing down sulfur dioxide release
Height, then release is slow, and it is fast that few then release is added；It mixes third is that melting later adhesive with molten wax, is discharged as sulfur dioxide
The decentralized medium of agent.
The sum of the sulfur dioxide releasing agent and content of hydrophobic additives account for it is described combine the 15 ~ 65% of gross mass, wax
Content accounts for the 20 ~ 70% of the combination gross mass, and binder content accounts for the 5 ~ 30% of the combination gross mass.
The preparation method of coating composition, which comprises the following steps:
A, sulfur dioxide releasing agent is mixed in proportion with hydrophobic additives；
B, it by the mixture of sulfur dioxide releasing agent and hydrophobic additives, is crushed using pulverizer, crushing rear material
Grain diameter D90≤80 micron；
C, wax and adhesive are subjected to heating and melting, smashed sulfur dioxide releasing agent and hydrophobicity point is added in melting liquid
The mixture of powder；
D, it by above-mentioned composition, under the conditions of 80 ~ 120 DEG C of temperature, is stirred, disperses, shears, uniform, stable painting is made
Cloth composition.
In above-mentioned preparation method.
In step A, the method that sulfur dioxide releasing agent and hydrophobic additives are mixed in proportion is more, Ke Yi
On-line mixing is carried out before pulverizer or is mixed using mixing apparatus, and common mixing apparatus includes V-Mixer, horizontal double spiral shells
Band mixing machine, vertical biconical mixing machine, multi-dimensional movement mixing machine etc..
In step B, mixture is crushed using pulverizer.Breaking method and form are varied, and common crushing is set
Have Universalpulverizer, micronizer, airslide disintegrating mill etc.；Distinct device control smashing fineness method is different, with ten thousand
Can pulverizer smashing fineness and feed particles degree size, motor speed, to separate power of fan, screened port size etc. related；
Airslide disintegrating mill smashing fineness and compressed air air pressure size, charging rate, grading wheel frequency etc. are related.
The grain fineness of mixture after crushing, D90≤80 micron, preferred D90≤60 micron, further preferred D90
≤ 40 microns.Granularity fineness D90 numerical value, representative are 90% particle diameter distributions in mixture.The detection method of grain fineness is
The detection of wet process laser particle analyzer.
In step C, wax and adhesive are subjected to heating and melting, usually carried out in the agitator tank heated with collet, it is excellent
Multi-functional dispersion blender is selected, has agitating paddle and dispersion impeller in blender, more preferably there is high speed shear head or pipeline cutter.
Preferred Multi-functional dispersion blender is can to seal, and can carry out vacuumize process.Wax and adhesive in tank to be mixed is molten
Melt the mixture for adding crush in step B after mixing.
It in step D, in above-mentioned agitator tank, keeps feed liquid under the conditions of 80 ~ 120 DEG C of temperature, continues stirring, opens
The time of dispersion impeller or cutter, conventional mixing dispersion is 15 ~ 150min, and preferably mixing jitter time is 45 ~ 90min, finally
Uniform, stable coating composition is made.During step D stirring, dispersion or shearing, preferably agitator tank is in negative pressure
State (vacuumizes), and the requirement of conventional vacuum degree is -0.03 ~ -0.09Mpa, preferably vacuum degree -0.08 ~ -0.09Mpa.
Coating composition, purposes are that coating composite algorithm prepares fresh keeping pad for fruit.
The hot composite coating technique, the constant temperature by the composition processed at 80 ~ 120 DEG C are coated again
Close, it is compound after fresh-keeping mat should cool the temperature to 50 DEG C or less using cooling roller immediately and wound.The compound work of above-mentioned coating
Skill can be the techniques such as extrusion coated coating head slit, blade coating, bar blade coating.
A kind of fresh keeping pad for fruit contains above-mentioned coating composition.Fresh keeping pad for fruit can be the transport of single coating
With fresh-keeping mat, it is also possible to the long acting fresh-keeping pad of two sections of release.The long-acting fresh keeping pad for fruit of two sections of release, rapid release layer,
Content containing sulfur dioxide releasing agent is usually lower, and coating weight is few；It is sustained releasing layer, the content containing sulfur dioxide releasing agent
Usually higher, coating weight is more.
Beneficial effects of the present invention:
1, the present invention uses magnesium stearate or calcium stearate for hydrophobic additives, prevents particle aggregation in coating composition；
2, the present invention use magnesium stearate or calcium stearate for hydrophobic additives, it is easier to the dispersion of sulfur dioxide releasing agent with
Process time is shortened in processing.
Specific embodiment
It is right in conjunction with specific embodiments in order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood
Technical solution of the present invention is described in detail, and the present invention is not limited to the ranges that embodiment is recorded.Concrete model is not indicated
Raw material be commercially available conventional raw material, be not specified actual conditions test method be conventional method known in the art and routine
Condition.
The method of grain fineness is wet process laser particle analyzer method after evaluation crushes in the present invention.Specific method is after crushing
Sulfur dioxide releasing agent and dispersing agent mixture, using dehydrated alcohol as decentralized medium, use laser particle analyzer test particle
Diameter and distribution.
Evaluated in the present invention composition in the molten state sulfur dioxide releasing agent degree of scatter and particle aggregation degree with
Granule number and particle aggregation inhibiting rate are technical indicator.
Granule number index Evaluation Method.
The detection method of composition sulfur dioxide releasing agent dispersion degree in the molten state, takes molten condition dispersion mixing equal
Even composition, it is vertical to immerse the 30mm depth 5s time in composition using 25mm*50mm stainless steel rule, then vertically take out,
10s is stood, detects by an unaided eye and counts the quantity that stainless steel rule tow sides are more than 0.1mm visible particle, with amounts of particles
How much degree of scatter judged, every group is averaged for sample parallel testing 3 times.
Granule number numerical value is smaller, shows that degree of scatter is better, and granule number numerical value is bigger, shows that degree of scatter is poorer, conventional
In the case of, dispersion degree numerical value≤2 are qualification.
Particle aggregation inhibiting rate evaluation method.
The uniform composition 1kg of molten condition dispersion mixing is taken, under the conditions of 100 ± 2.5 DEG C of constant temperature, not using 100 mesh
Rust steel sieve (it is 150 microns that 100 mesh screens, which correspond to aperture) is filtered, the quality for weighing and not filtering material, filter material, with
The ratio that the quality of filtration material accounts for gross mass is particle aggregation inhibiting rate.Every group is averaged for sample parallel testing 3 times.
Calculation formula: aggregation inhibiting rate=filtration material quality/(filtration quality of material+quality of material is not filtered) ×
100%。
Aggregation inhibits rate score bigger, illustrates to inhibit particle aggregation effect better, and aggregation inhibits rate score smaller, inhibits
Particle aggregation effect is smaller, and inhibiting rate score is 100, illustrates to completely inhibit particle aggregation.
Raw materials used and specification is as follows in embodiment.
Sulfur dioxide releasing agent:
Sodium pyrosulfite, food additive grade, active constituent content >=96.5% are commercially available；
Potassium metabisulfite, food additive grade, active constituent content >=96.5% are commercially available；
Sulfurous acid acid hydrogen sodium, analysis is pure, commercially available；
Sulfurous acid potassium hydrogen phthalate, analysis is pure, commercially available.
Hydrophobic additives:
Odium stearate, analysis is pure, commercially available；
Magnesium stearate, pharmaceutical grade pharmaceutical auxiliaries are commercially available；
Calcium stearate, analysis is pure, commercially available；
Silica: the white carbon black of precipitation method preparation, it is commercially available.
Solid wax:
Semi-refined wax, it is 95 DEG C of melt temperature, commercially available；
Wax is refined, it is 100 DEG C of melt temperature, commercially available；
Microwax, trade mark 85# are 85 DEG C of melt temperature, commercially available.
Adhesive:
Ethylene-vinyl acetate resin (abbreviation EVA), is selected from Du Pont Elvax 260, and fusing point (DSC) representative value is 75 DEG C；
Thermoplastic polyurethane elastomer (abbreviation TPU) is selected from Desmopan TPU 537M, softening point temperature≤95 DEG C；
Polyvinyl resin (abbreviation PE), be selected from Beijing petrochemical industry LDPE 1C7A, 105 DEG C of melting temperature；
Acrylic resin, it is commercially available, 120 DEG C of melting temperature.
The following are specific embodiments.
Embodiment 1.
Coating composition 1: the mass ratio of each component is as follows
Sodium pyrosulfite: 50%, odium stearate: the mass ratio of 2.5%(sulfur dioxide releasing agent and hydrophobic additives is 20:1),
Semi-refined wax: 37.5%, TPU:10%.
The preparation method of coating composition 1:
A, sulfur dioxide releasing agent is mixed in proportion with hydrophobic additives；
B, it by the mixture of sulfur dioxide releasing agent and hydrophobic additives, is crushed using Universalpulverizer, object after crushing
Expected 200 meshes, particle diameter D90≤80 micron；
C, wax and adhesive are subjected to heating and melting, smashed sulfur dioxide releasing agent and hydrophobicity point is added in melting liquid
The mixture of powder；
D, it by above-mentioned composition, under the conditions of 100 ~ 110 DEG C of temperature, is stirred, disperses, shears, uniform, stable painting is made
Cloth composition.Using 120L Multi-functional dispersion blender, 1 lots processed 100kg coating composition, the dispersing shear time is
1h。
Reference composition 1: the mass ratio of each component is as follows
Sodium pyrosulfite: 50%, semi-refined wax: 40.0%, TPU:10%.
Reference composition 1 and the ingredient type of coating composition 1 are in addition to lacking hydrophobic compound, other type phases
Together, ratio is almost the same.
The preparation method of reference composition 1: (in addition to step A, with 1 preparation method of coating composition)
A, it by sulfur dioxide releasing agent, is crushed using Universalpulverizer, crushing rear material crosses 200 meshes, particle diameter D90
≤ 80 microns；
B, wax and adhesive are subjected to heating and melting, smashed sulfur dioxide releasing agent and hydrophobicity point is added in melting liquid
The mixture of powder；
C, it by above-mentioned composition, under the conditions of 100 ~ 110 DEG C of temperature, is stirred, disperses, shears, uniform, stable painting is made
Cloth composition.Using 120L Multi-functional dispersion blender, 1 lots processed 100kg coating composition, the dispersing shear time is
1h。
The composition is solid-state under the conditions of being lower than 50 DEG C, and two in composition in 60 ~ 150 DEG C of meltings and flowable
Sulfur oxide releasing agent particle is uniformly dispersed, without cohesion, is suspension system in molten condition.
Composition the performance test results in the molten state:
。
Test result analysis:
Hydrophobic additives (20:1) is added in coating composition 1 compared with reference composition in coating composition 1, can be bright
Aobvious to reduce granule number, particle aggregation inhibiting rate significantly improves, and is conducive to the dispersion of sulfur dioxide releasing agent, can obviously inhibit particle poly-
Collection.
Embodiment 2.
Coating composition 2: the mass ratio of each component is as follows
Potassium metabisulfite: 20%, odium stearate: the mass ratio of 0.3%(sulfur dioxide releasing agent and hydrophobic additives is 66.6:
1), semi-refined wax: 49.7%, EVA resin: 30%.
The preparation method of coating composition 2: with the preparation method of coating composition 1.
Reference composition 2: the mass ratio of each component is as follows
Potassium metabisulfite: 20%, semi-refined wax: 50.0%, EVA resin: 30%.
The preparation method of reference composition 2: with the preparation method of reference composition 1.
Composition the performance test results in the molten state:
。
Test result analysis:
Coating composition 2 is added hydrophobic additives (66.6:1), can significantly reduce granule number, and particle aggregation inhibiting rate is aobvious
It writes and improves, be conducive to the dispersion of sulfur dioxide releasing agent.Particle aggregation can obviously be inhibited compared with the control.
Embodiment 3.
Coating composition 3: the mass ratio of each component is as follows
Potassium metabisulfite: 40%, sodium hydrogensulfite: 20%, magnesium stearate: 0.3%, (sulfur dioxide releasing agent and hydrophobic additives
Mass ratio be 200:1), refine wax: 34.7%, polyvinyl resin: 5%.
The preparation method of coating composition 3: with the preparation method of coating composition 1.
Reference composition 3: the mass ratio of each component is as follows
Potassium metabisulfite: 40%, sodium hydrogensulfite: 20%, refining wax: 35.0%, polyvinyl resin: 5%.
The preparation method of reference composition 3: with the preparation method of reference composition 1.
Composition the performance test results in the molten state:
。
Test result analysis:
Coating composition 3 is added hydrophobic additives (200:1), can significantly reduce granule number, is conducive to sulfur dioxide release
Agent dispersion, particle aggregation inhibiting rate significantly improve, and can obviously inhibit particle aggregation compared with the control.
Embodiment 4.
Coating composition 4: the mass ratio of each component is as follows
Sodium pyrosulfite 15%, potassium bisulfite: 10%, odium stearate: 5.0%, (sulfur dioxide releasing agent and hydrophobic additives
Mass ratio be 5:1), refine wax: 45%, EVA resin: 25%.
The preparation method of coating composition 4: with the preparation method of coating composition 1.
Reference composition 4: the mass ratio of each component is as follows
Sodium pyrosulfite: 15%, potassium bisulfite: 10%, refining wax: 50%, acrylic resin: 25%.
The preparation method of reference composition 4: with the preparation method of reference composition 1.
Composition the performance test results in the molten state:
。
Test result analysis:
Coating composition 3 is added hydrophobic additives (5:1), can significantly reduce granule number, be conducive to sulfur dioxide releasing agent
Dispersion.Particle aggregation can obviously be inhibited compared with the control.
Embodiment 5.
Coating composition 5: the mass ratio of each component is as follows
Sodium pyrosulfite: 25%, potassium bisulfite: 9%, sodium hydrogensulfite: 8%, magnesium stearate: 1.0%, (sulfur dioxide releasing agent
Mass ratio with hydrophobic additives is 42:1), refining wax: 42%, EVA resin: 15%.
The preparation method of coating composition 5: with the preparation method of coating composition 1.
Embodiment 6.
Coating composition 6: the mass ratio of each component is as follows
Sodium pyrosulfite: 25%, potassium bisulfite: 9%, sodium hydrogensulfite: 8%, magnesium stearate: 1.0%, calcium stearate: 0.5%(bis-
The mass ratio of sulfur oxide releasing agent and hydrophobic additives is 28:1), semi-refined wax: 25%, refining wax: 19%, EVA resin:
7.5%, TPU:5.0%.
The preparation method of coating composition 6: with the preparation method of coating composition 1.
Embodiment 7.
Coating composition 7: the mass ratio of each component is as follows
Sodium pyrosulfite: 25%, potassium bisulfite: 9%, sodium hydrogensulfite: 8%, magnesium stearate: 1.0%, silica: 0.5%(bis-
The mass ratio of sulfur oxide releasing agent and hydrophobic additives is 28:1), semi-refined wax: 25%, refining wax: 19%, EVA resin:
7.5%, TPU:5.0%.
The preparation method of coating composition 7: with the preparation method of coating composition 1.
Embodiment 8.
Coating composition 8: the mass ratio of each component is as follows
Sodium pyrosulfite: 64.5%, magnesium stearate: 0.5%, (mass ratio of sulfur dioxide releasing agent and hydrophobic additives is
129:1), microwax: 26%, EVA resin: 5.0%, TPU:4.0%.
The preparation method of coating composition 8: with the preparation method of coating composition 1.
Embodiment 9.
Coating composition 9: the mass ratio of each component is as follows
Sodium pyrosulfite: 37.5%, magnesium stearate: 0.5%, (mass ratio of sulfur dioxide releasing agent and hydrophobic additives is 75:
1), microwax: 27%, refining wax: 20%, EVA resin: 7.5%, TPU:7.5%.
The preparation method of coating composition 9:
A, sulfur dioxide releasing agent is mixed in proportion with hydrophobic additives；
B, it by the mixture of sulfur dioxide releasing agent and hydrophobic additives, is crushed using airslide disintegrating mill, object after crushing
Material is detected, particle diameter D90≤60 micron；
C, wax and adhesive are subjected to heating and melting, smashed sulfur dioxide releasing agent and hydrophobicity point is added in melting liquid
The mixture of powder；
D, it by above-mentioned composition, under the conditions of 80 ~ 100 DEG C of temperature, is stirred, disperses, shears, uniform, stable painting is made
Cloth composition.Use 120L Multi-functional dispersion blender, 1 lots processed 100kg coating composition.
Reference composition 9: the mass ratio of each component is as follows
Sodium pyrosulfite: 37.5%, microwax: 27.5%, refining wax: 20%, EVA resin: 7.5%, TPU:7.5%.
The preparation method of reference composition 9:
A, by sulfur dioxide releasing agent, crushed using airslide disintegrating mill, crushing rear material through detecting, particle diameter D90≤
60 microns；
B, wax and adhesive are subjected to heating and melting, smashed sulfur dioxide releasing agent and hydrophobicity point is added in melting liquid
The mixture of powder；
C, it by above-mentioned composition, under the conditions of 80 ~ 100 DEG C of temperature, is stirred, disperses, shears, uniform, stable painting is made
Cloth composition.Use 120L Multi-functional dispersion blender, 1 lots processed 100kg coating composition.
9 process equipment of reference composition is identical as coating composition 9 as condition.
Composition test result:
。
Test result analysis:
Coating composition 9, (hydrophobic additives 75:1 is added), processes 1h, granule number is less than 2.0, particle aggregation inhibiting rate
Reach 96.4%, illustrates that processing has reached requirement, extend with process time, degree of scatter is better；Reference composition 9(is not added thin
Aqueous dispersion), extend with process time, granule number becomes smaller, and particle aggregation inhibiting rate increases, and needs dispersing shear 4h or more basic
Achieve the effect that 9 dispersing shear 1h of coating composition.Illustrate that hydrophobic additives are added in the composition substantially to be shortened
The process time of coating composition.
Embodiment 10.
Coating composition 10: the mass ratio of each component is as follows
Sodium pyrosulfite: 62.5%, magnesium stearate: 2.5%, (mass ratio 25 of sulfur dioxide releasing agent and hydrophobic additives:
1), semi-refined wax: 27.5%, EVA resin: 7.5%.
The preparation method of coating composition 10:
A, sulfur dioxide releasing agent is mixed in proportion with hydrophobic additives；
B, it by the mixture of sulfur dioxide releasing agent and hydrophobic additives, is crushed using airslide disintegrating mill, object after crushing
Material is detected, particle diameter D90≤60 micron；
C, wax and adhesive are subjected to heating and melting, smashed sulfur dioxide releasing agent and hydrophobicity point is added in melting liquid
The mixture of powder；
D, it by above-mentioned composition, under the conditions of 100 ~ 120 DEG C of temperature, is stirred, disperses, shears.Use multi-functional point of 120L
Dissipate blender, 1 lots processed 100kg coating composition.
Reference composition 10: the mass ratio of each component is as follows
Sodium pyrosulfite: 62.5%, semi-refined wax: 30.0%, EVA resin: 7.5%.
The preparation method of reference composition 10:
A, by sulfur dioxide releasing agent, crushed using airslide disintegrating mill, crushing rear material through detecting, particle diameter D90≤
60 microns；
B, wax and adhesive are subjected to heating and melting, smashed sulfur dioxide releasing agent and hydrophobicity point is added in melting liquid
The mixture of powder；
C, it by above-mentioned composition, under the conditions of 100 ~ 120 DEG C of temperature, is stirred, disperses, shears.Use multi-functional point of 120L
Dissipate blender, 1 lots processed 100kg coating composition.
10 process equipment of reference composition is identical as coating composition 10 as condition.
Composition test result:
。
Test result analysis:
Coating composition 10, (hydrophobic additives 25:1 is added), processes 2h, granule number is less than 2.0, particle aggregation inhibiting rate
Reach 97.5%, have reached processing request, extend with process time, degree of scatter is better；Reference composition 10(is without hydrophobicity group
Object is closed, other are substantially with coating composition 10), extend with process time, granule number becomes smaller, and particle aggregation inhibiting rate increases,
Need the dispersing shear side 4h that can achieve the effect that 10 dispersing shear 1h of coating composition.Test explanation is added hydrophobic in the composition
Property dispersing agent can substantially shorten the process time of coating composition.
Embodiment 11.
The purposes of coating composition.
Using the coating composition processed in previous embodiment, combination process is scratched using bar using coating complex machine
Prepare fresh keeping pad for fruit.
The preparation method of fresh keeping pad for fruit: being completed using coating complex machine, and there are two unwinding devices for coating complex machine, respectively
Two kinds of substrates of fresh keeping pad for fruit are placed, a wrap-up is responsible for the winding of the compound rear fresh keeping pad for fruit of coating, and coating uses
Bar doctor blade process is completed by apparatus for coating, and the coating composition of preparation is delivered to apparatus for coating by pump, in base film
Upper quantitative blade coating keeps coating composition in 80 ~ 120 DEG C of conditions, apparatus for coating is maintained at 90 ~ 100 in doctor blade process
℃.Substrate and the progress of another substrate for being coated with medicament are compound, and two kinds of substrates are close to paste under the adhesive effect of composition
It closes, after cooling, fresh keeping pad for fruit finished product is made.Economic benefits and social benefits two-part can be made for coating twice and discharge fresh keeping pad for fruit.
It is the fresh keeping pad for fruit prepared by above-mentioned coating combination process below.
Transport fresh keeping pad for fruit 1: using 12 microns of PET film as substrate, coating composition 2, coating are quantitatively scratched
Amount is 30 ~ 35g/ square metres, then the polypropylene non-woven fabric of compound 40g is made of substrate.
Transport fresh keeping pad for fruit 2: using 12 microns of PET film as substrate, coating composition 4, coating are quantitatively scratched
Amount is 30 ~ 35g/ square metres, then the polypropylene non-woven fabric of compound 40g is made of substrate.
Transport fresh keeping pad for fruit 3: using 12 microns of PET film as substrate, coating composition 5, coating are quantitatively scratched
Amount is 20 ~ 25g/ square metres, then the polypropylene non-woven fabric of compound 40g is made of substrate.
Long-acting fresh keeping pad for fruit 1: using 12 microns of PET film as substrate, coating composition 1, coating weight are quantitatively scratched
It is 35 ~ 40g/ square metres, semi-finished product are made in compound 8 microns of PET film, and then again using semi-finished product as substrate, quantitative blade coating is applied
Cloth composition 2, coating weight are 20 ~ 25g/ square metres, then the polypropylene non-woven fabric of compound 40g is made of substrate.
Long-acting fresh keeping pad for fruit 2: using 12 microns of PET film as substrate, coating composition 10, coating weight are quantitatively scratched
It is 60 ~ 65g/ square metres, semi-finished product are made in compound 8 microns of PET film, and then again using semi-finished product as substrate, quantitative blade coating is applied
Cloth composition 9, coating weight are 20 ~ 25g/ square metres, then the polypropylene non-woven fabric of compound 40g is made of substrate.
Long-acting fresh keeping pad for fruit 3: using 12 microns of PET film as substrate, coating composition 3, coating weight are quantitatively scratched
It is 45 ~ 50g/ square metres, semi-finished product are made in compound 8 microns of PET film, and then again using semi-finished product as substrate, quantitative blade coating is applied
Cloth composition 7, coating weight are 15 ~ 20g/ square metres, then the polypropylene non-woven fabric of compound 40g is made of substrate.
By the different fresh keeping pad for fruit of above-mentioned preparation, 23.5 × 35cm is cut into, for the storage of red grape and fresh-keeping,
Every case uses 1 fresh keeping pad for fruit, and non-woven fabrics side is close to grape.Transport can be in 15 days slowly with fresh keeping pad for fruit 1 ~ 3
It is fresh-keeping to discharge sulfur dioxide progress, works well.It can be with fresh-keeping red grape using long-acting fresh keeping pad for fruit 1 ~ 3 in freezer
90 ~ 120 days.
Claims (10)
1. a kind of coating composition contains sulfur dioxide releasing agent, wax, adhesive and hydrophobic additives, it is characterised in that:
The mass ratio of the sulfur dioxide releasing agent and hydrophobic additives is 5 ~ 200:1；The hydrophobic additives contain stearic acid
It is sodium, calcium stearate, one or two kinds of in magnesium stearate.
2. coating composition according to claim 1, the composition is being lower than in 60 ~ 150 DEG C of meltings and flowable
It is solid-state under the conditions of 50 DEG C, and sulfur dioxide releasing agent particle is uniformly dispersed, without cohesion in composition, is to suspend in molten condition
System.
3. coating composition according to claim 1, which is characterized in that the hydrophobic additives can also contain two
Silica.
4. coating composition according to claim 1, which is characterized in that the hydrophobic additives are preferably stearic acid
Magnesium.
5. the coating composition according to claim 1, which is characterized in that the sulfur dioxide releasing agent is Jiao Ya
One or more of sodium sulphate, potassium metabisulfite, sodium hydrogensulfite, potassium bisulfite.
6. the coating composition according to claim 1, the wax is solid wax of the fusing point less than 100 DEG C, selected from half essence
One or more of refine wax, refine cured, microwax；Described adhesive be selected from ethylene-vinyl acetate resin, polyvinyl resin,
One or more of thermoplastic polyurethane elastomer, acrylic resin, the melting point or softening point temperature of described adhesive are small
In equal to 120 DEG C.
7. the coating composition according to claim 1, the content of the sulfur dioxide releasing agent and hydrophobic additives
The sum of account for the 15 ~ 65% of the combination gross mass, wax content accounts for the 20 ~ 70% of the combination gross mass, and binder content accounts for described
Combine the 5 ~ 30% of gross mass.
8. a kind of preparation method of coating compositions described in any item according to claim 1 ~ 7, which is characterized in that including with
Lower step:
A, sulfur dioxide releasing agent is mixed in proportion with hydrophobic additives；
B, it by the mixture of sulfur dioxide releasing agent and hydrophobic additives, is crushed using pulverizer, crushing rear material
Grain diameter D90≤80 micron；
C, wax and adhesive are subjected to heating and melting, smashed sulfur dioxide releasing agent and hydrophobicity point is added in melting liquid
The mixture of powder；
D, it by above-mentioned composition, under the conditions of 80 ~ 120 DEG C of temperature, is stirred, disperses, shears, uniform, stable painting is made
Cloth composition.
9. described in any item coating compositions according to claim 1 ~ 7, purposes is that coating composite algorithm prepares fruit freshness preserving
Pad.
10. a kind of fresh keeping pad for fruit, which is characterized in that contain the described in any item coating compositions of claim 1 ~ 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910028940.4A CN109705717A (en) | 2019-01-12 | 2019-01-12 | A kind of coating composition, preparation method and its usage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910028940.4A CN109705717A (en) | 2019-01-12 | 2019-01-12 | A kind of coating composition, preparation method and its usage |
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| CN109705717A true CN109705717A (en) | 2019-05-03 |
Family
ID=66260006
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910028940.4A Pending CN109705717A (en) | 2019-01-12 | 2019-01-12 | A kind of coating composition, preparation method and its usage |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1279022A (en) * | 1999-06-30 | 2001-01-10 | 中国科学院新疆物理研究所 | Long-acting antistaling tablet for grapes |
| CN1620876A (en) * | 2004-12-15 | 2005-06-01 | 济南营养源食品科技有限公司 | Fresh keeping tablet for grape produced adopting full powder direct pelleting method |
| CN106343011A (en) * | 2015-07-24 | 2017-01-25 | 胡正才 | Grape refreshing pad with humidity-adjusting and refreshing dual functions and preparation method thereof |
| CN106720237A (en) * | 2016-12-27 | 2017-05-31 | 山东营养源食品科技有限公司 | A kind of fresh keeping pad for fruit |
-
2019
- 2019-01-12 CN CN201910028940.4A patent/CN109705717A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1279022A (en) * | 1999-06-30 | 2001-01-10 | 中国科学院新疆物理研究所 | Long-acting antistaling tablet for grapes |
| CN1620876A (en) * | 2004-12-15 | 2005-06-01 | 济南营养源食品科技有限公司 | Fresh keeping tablet for grape produced adopting full powder direct pelleting method |
| CN106343011A (en) * | 2015-07-24 | 2017-01-25 | 胡正才 | Grape refreshing pad with humidity-adjusting and refreshing dual functions and preparation method thereof |
| CN106720237A (en) * | 2016-12-27 | 2017-05-31 | 山东营养源食品科技有限公司 | A kind of fresh keeping pad for fruit |
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| Title |
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| 宫言佩: "葡萄微胶囊型保鲜剂的制备及其缓蚀性能的研究", 《万方数据》 * |
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Application publication date: 20190503 |