CN106380672A - Two-ingredient synergetic antimicrobial gas regulation and fresh keeping functional film and preparation method thereof - Google Patents
Two-ingredient synergetic antimicrobial gas regulation and fresh keeping functional film and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08L2203/16—Applications used for films
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
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Abstract
The invention discloses a two-ingredient synergetic antimicrobial gas regulation and fresh keeping functional film and a preparation method thereof, and belongs to the technical field of plastic package. The two-ingredient synergetic antimicrobial gas regulation and fresh keeping functional film is characterized by being prepared from the following raw materials in percentage by mass: 2.5 to 25 weight percent of high-concentration master batch A, 2.5 to 25 weight percent of high-concentration master batch B and 50 to 95 weight percent of low-density polyethylene resin; the high-concentration master batch A is characterized by being prepared from the following raw materials in percentage by mass: 5 to 10 weight percent of nanometer titanium dioxide silver exchange powder, 1 to 2 weight percent of stearic acid, 0.5 to 1 weight percent of other filling materials and 87 to 94 weight percent of low-density polyethylene resin; the high-concentration master batch B is characterized by being prepared from the following raw materials in percentage by mass: 5 to 10 weight percent of citric acid, 1.5 to 3 weight percent of stearic acid, 1 to 2 weight percent of talcum powder, 0.5 to 1 weight percent of calcium carbonate and 84 to 92 weight percent of low-density polyethylene resin. The production process is mature and is simple; the cost is low; the inorganic-organic synergetic efficient antibacterium is realized; the O2 and water vapor penetration performance is good; the adsorption performance and penetration performance on harmful gas such as CO2 and ethylene are good; the ultraviolet ray harm is shielded; the fruit and vegetable fresh keeping effect is obvious; the shelf life is prolonged.
Description
Technical field
The invention belongs to technical field of plastic package, a kind of specific design double-component Synergistic antimicrobial controlled atmosphere functional membrane and
Its preparation method.
Background technology
Easily there is rotten corruption in fresh fruit and vegerable in transporting after harvesting, sell and preserving.China's fruit and vegerable damage puerperal at present
Mistake rate reaches 20%～30%, causes nearly 80,000,000,000 yuan of economic losses.
The fresh-keeping of fresh fruit and vegerable is mainly regulated and controled by the three big key elements that quality is played a crucial role.First, control it
Senescence process, the typically control by accumulating to harmful gass such as Repiration, ethylene are realized；Secondly, control microorganism, main
Will be by realizing to the control of putrefaction bacteria；Finally, control the accumulation of package interior water smoke, mainly by envionmental humidity
The structuring with iuntercellular moisture is controlled to realize.The most preservative films sold currently on the market and common plasticses bag are all
With ethylene masterbatch as raw material, different according to ethylene masterbatch are divided into PVC fresh-preserving film and PE preservative film again, the depositing of PVC fresh-preserving film
In certain healthy hidden danger, so focusing more on PE preservative film.And existing PE preservative film is more single, most of fresh-keeping
Film does not possess antibacterial functions, and cannot accomplish O2And CO2Two-ways regulation, accumulation easily occur in preservative film have in storage
The phenomenons such as evil gas, condensation.A kind of antibacterial for high respiratory intensity Fresh-keeping Packaging for Fruits and Vegetables, air-conditioning preservative film are to meet society to need
Ask.
Content of the invention
The present invention exists to overcome the shortcomings of prior art, there is provided one kind is provided simultaneously with high-efficiency antimicrobial, is passivated enzyme activity
Property, color fixative, ventilative balance adjustment, ethylene absorption, removal, prevent the double-component Synergistic antimicrobial controlled atmosphere functional membrane of water smoke accumulation
And preparation method thereof.
Technical scheme main points are：
A kind of double-component Synergistic antimicrobial controlled atmosphere functional membrane is it is characterised in that the following raw material in parts by weight：2.5
The high concentration master batch A of～25wt%, the high concentration mother particle B of 2.5～25wt%, the ldpe resin of 50～95wt%.
In the present invention, described high concentration master batch A is it is characterised in that the following raw material in parts by weight：5～10wt%'s
Nano titanium oxide silver exchange powder body, the stearic acid of 1～2wt%, other fillers of 0.5～1wt%, 87～94wt% low close
Degree polyvinyl resin.
In the present invention, described high concentration mother particle B is it is characterised in that the following raw material in parts by weight：5～10wt%'s
Citric acid, the stearic acid of 1.5～3wt%, the Pulvis Talci of 1～2wt%, the Calcium Carbonate of 0.5～1wt%, 84～92wt% low
Density Polyethylene Resin.
In the present invention, described nano titanium oxide silver exchanges diameter of particle and is less than 30nm, and silver content is 2.0 ± 0.2wt%.
In the present invention, described citric acid is through 65 DEG C of drying 48h process of high-temperature blast drying oven.
The present invention also disclosed a kind of preparation method of double-component Synergistic antimicrobial controlled atmosphere functional membrane, walks including following
Suddenly：
(1) preparation of high concentration master batch A：Weigh in mass ratio 5～10wt% nano titanium oxide silver exchange powder body, 1
The stearic acid of～2wt%, other fillers of 0.5～1wt%, the ldpe resin of 87～94wt%, use high speed batch mixing
With the rotating speed mixing 3min of 500rpm, (antimicrobial component being added, as Nano grade, has special skin effect to machine, with LDPE
Particle surface adhesiving effect is good, obvious powder and sinks to the bottom phenomenon).Batch mixing is passed through double-screw extruding pelletizing machine again
Pelletizing, obtains high concentration master batch A.
Double-screw extruding pelletizing machine temperature sets：160℃、165℃、170℃、170℃、170℃、170℃、170℃、
170 DEG C, 170 DEG C, 170 DEG C, hopper feed speed is 10rpm, and twin screw rotating speed is 120rpm, and pelletizing speed is 4.6m/min.
(2) preparation of high concentration mother particle B：Weigh the citric acid of 5～10wt%, the Hard Fat of 1.5～3wt% in mass ratio
Acid, the Pulvis Talci of 1～2wt%, the Calcium Carbonate of 0.5～1wt%, the ldpe resin of 84～92wt%, mixed with high speed
Material machine is with the rotating speed mixing 3min of 500rpm.For improving filler and LDPE Particle Mixing Result, during batch mixing, according to circumstances Deca is fitted
The dimethicone of amount, batch mixing is passed through the pelletizing again of double-screw extruding pelletizing machine, obtains high concentration mother particle B.
Double-screw extruding pelletizing machine temperature sets：140℃、145℃、150℃、150℃、150℃、150℃、150℃、
150℃、150℃、155℃.Hopper feed speed is 16rpm, and twin screw rotating speed is 290rpm, and pelletizing speed is 6.5m/min.
(3) preparation of double-component Synergistic antimicrobial controlled atmosphere functional membrane：Weigh the high concentration of 2.5～25wt% in mass ratio
Master batch A, the high concentration mother particle B of 2.5～25wt%, the ldpe resin of 50～95wt% are through high speed batch mixing, secondary
Casting film-forming after pelletize.
Extrusion casting machine temperature between feed end to die head is followed successively by 145 DEG C, 150 DEG C, 150 DEG C, 150 DEG C, die head two
End temperature is 155 DEG C, and interlude temperature is 150 DEG C.Screw speed is 40rpm, and curtain coating chill roll rotating speed is 2.0m/min, traction
Roller rotating speed is 2.2m/min, and wind-up roll rotating speed is 24rpm.
The beneficial effect that the present invention is reached：(1) inorganic antiseptic is compounded with organic anti-bacterial preservative, realize collaborative height
Effect antibacterial, Ag-carried nanometer titanium dioxide is by the antibacterial effect of Ag and nano-TiO2Photocatalysis antibacterial combine, kill antibacterial
The Final pollution that degraded endotoxin causes simultaneously, citric acid is as conventional food additive, the one-tenth of its metabolism opposite fresh fruit vegetable
Ripe aging has important physiological significance, and pH is in acidity, has bacteriostasis, its chelation can be passivated enzymatic activity, also simultaneously
There is color fixative, improve the functions such as local flavor.(2) interpolation of inorganic filler is so that thin film is to CO2, harmful gass and the water such as ethylene
The permeability of steam significantly improves, and can exclude harmful gass in time, prevent water smoke from accumulating, have ventilative Balanceregulation.(3)
Inorganic antibacterial agent carrier is nano titanium oxide, has ethylene adsorption gas, the function of masking ultraviolet, improves the whole of preservative film
Body effect.(4) interpolation of nanoparticle, can improve the mechanical property of thin film, while the present invention states fresh-keeping function in realization
Improve the tensile strength of thin film.
Specific embodiment
With reference to embodiment, the invention will be further described, but protection scope of the present invention is not limited to described enforcement
Example.
Embodiment 1
A kind of double-component Synergistic antimicrobial controlled atmosphere functional membrane, consists of in mass ratio：The high concentration master batch A of 2.5wt%,
The high concentration mother particle B of 2.5wt%, the ldpe resin of 95wt%.High concentration master batch A comprise in parts by weight as
Lower raw material：The nano titanium oxide silver of 10wt% exchanges powder body, the stearic acid of 2wt%, other fillers of 1wt%, 87wt%
Ldpe resin.High concentration mother particle B comprises the following raw material in parts by weight：The citric acid of 10wt%, 3wt%
Stearic acid, the Pulvis Talci of 2wt%, the Calcium Carbonate of 1wt%, the ldpe resin of 84wt%.Wherein titanium dioxide silver is handed over
Change diameter of particle and be less than 30nm, silver content is 2.0 ± 0.2wt%, citric acid is dried at 48h for 65 DEG C through high-temperature blast drying oven
Reason.
Preparation method includes：
The preparation of step (1) high concentration master batch A：The nano titanium oxide silver of 10wt% is exchanged the Hard Fat of powder body, 2wt%
Acid, the ldpe resin high speed mixer of other fillers of 1wt%, 87wt% are with the rotating speed mixing 3min of 500rpm
(antimicrobial component being added is Nano grade, has special skin effect, good with LDPE particle surface adhesiving effect, not
Obvious powder occurs and sinks to the bottom phenomenon).Batch mixing is passed through the pelletizing again of double-screw extruding pelletizing machine, obtains high concentration master batch A.Double
Screw extruder pelletizer temperature sets：160℃、165℃、170℃、170℃、170℃、170℃、170℃、170℃、170℃、
170 DEG C, hopper feed speed is 10rpm, and twin screw rotating speed is 120rpm, and pelletizing speed is 4.6m/min.
The preparation of step (2) high concentration mother particle B：By the citric acid of 10wt%, the stearic acid of 3wt%, 2wt% Talcum
Powder, the Calcium Carbonate of 1wt%, the ldpe resin high speed mixer of 84wt% are with the rotating speed mixing 3min of 500rpm.
For improving filler and LDPE Particle Mixing Result, according to circumstances Deca appropriate dimethicone during batch mixing, batch mixing is passed through double
Screw extruder pelletizer pelletizing again, obtains high concentration mother particle B.Double-screw extruding pelletizing machine temperature sets：140℃、145℃、
150℃、150℃、150℃、150℃、150℃、150℃、150℃、155℃.Hopper feed speed is 16rpm, and twin screw turns
Speed is 290rpm, and pelletizing speed is 6.5m/min.
The preparation of step (3) double-component Synergistic antimicrobial controlled atmosphere functional membrane：The high concentration master batch A of 2.5wt%,
The high concentration mother particle B of 2.5wt%, 95wt% ldpe resin after high speed batch mixing, secondary granulation casting film-forming.
Extrusion casting machine temperature between feed end to die head is followed successively by 145 DEG C, 150 DEG C, 150 DEG C, 150 DEG C, and die head two ends temperature is
155 DEG C, interlude temperature is 150 DEG C.Screw speed is 40rpm, and curtain coating chill roll rotating speed is 2.0m/min, and carry-over pinch rolls rotating speed is
2.2m/min, wind-up roll rotating speed is 24rpm.
Embodiment 2
A kind of double-component Synergistic antimicrobial controlled atmosphere functional membrane, consists of in mass ratio：The high concentration master batch A of 10wt%,
The high concentration mother particle B of 10wt%, the ldpe resin of 80wt%.High concentration master batch A comprise in parts by weight as
Lower raw material：The nano titanium oxide silver of 5wt% exchanges powder body, the stearic acid of 1wt%, other fillers of 0.5wt%, 94wt%
Ldpe resin.High concentration mother particle B comprises the following raw material in parts by weight：The citric acid of 5wt%, 1.5wt%
Stearic acid, the Pulvis Talci of 1wt%, the Calcium Carbonate of 0.5wt%, the ldpe resin of 92wt%.Wherein titanium dioxide
Silver exchanges diameter of particle and is less than 30nm, and silver content is 2.0 ± 0.2wt%, and citric acid is through 65 DEG C of drying of high-temperature blast drying oven
48h process.Preparation method is ibid.
Embodiment 3
A kind of double-component Synergistic antimicrobial controlled atmosphere functional membrane, consists of in mass ratio：The high concentration master batch of 12.5wt%
The high concentration mother particle B of A, 12.5wt%, the ldpe resin of 75wt%.High concentration master batch A comprises in parts by weight
The following raw material：The nano titanium oxide silver of 8wt% exchanges powder body, the stearic acid of 2wt%, other fillers of 1wt%, 89wt%
Ldpe resin.High concentration mother particle B comprises the following raw material in parts by weight：The citric acid of 8wt%, 3wt%
Stearic acid, the Pulvis Talci of 2wt%, the Calcium Carbonate of 1wt%, the ldpe resin of 86wt%.Wherein titanium dioxide silver
Exchange diameter of particle and be less than 30nm, silver content is 2.0 ± 0.2wt%, citric acid is through 65 DEG C of drying 48h of high-temperature blast drying oven
Process.Preparation method is ibid.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not subject to above-described embodiment
Limit, other any changes without departing from spirit of the invention and principle, modification, replacement, combine, simplify, all should be equivalent
Substitute mode, be included in protection scope of the present invention.
The double-component Synergistic antimicrobial controlled atmosphere functional membrane of embodiment 1～3 preparation is resisted with reference to GB/T 31402-2015
Bacterium performance test, and carry out fruit freshness preserving test, by Fructus Fragariae Ananssae, Fructus Pruni pseudocerasi, green vegetable, Fructus Vitis viniferae, cherry tomato fresh-keeping as a example, by embodiment
The double-component Synergistic antimicrobial controlled atmosphere functional membrane of 1～3 preparation and the common low density polyethylene films as comparison, seal into guarantor
Fresh bag, (20～25 DEG C) packagings of room temperature preserve above-mentioned fruit and vegerable, and daily organoleptic quality of observing changes, and result is as follows：
Claims (6)
1. a kind of double-component Synergistic antimicrobial controlled atmosphere functional membrane it is characterised in that：Described double-component Synergistic antimicrobial controlled atmosphere
Functional membrane main component be high concentration master batch A, the high concentration mother particle B of 2.5～25wt% that mass fraction is 2.5～25wt%,
The ldpe resin of 50～95wt%.
2. a kind of double-component Synergistic antimicrobial controlled atmosphere functional membrane according to claim 1 it is characterised in that：Described highly concentrated
Degree master batch A main component is that the nano titanium oxide silver that mass fraction is 5～10wt% exchanges powder body, the Hard Fat of 1～2wt%
Acid, other fillers of 0.5～1wt%, the ldpe resin of 87～94wt%.
3. a kind of double-component Synergistic antimicrobial controlled atmosphere functional membrane according to claim 1 it is characterised in that：Described highly concentrated
Degree mother particle B main component be mass fraction be the citric acid of 5～10wt%, the stearic acid of 1.5～3wt%, the cunning of 1～2wt%
Stone powder, the Calcium Carbonate of 0.5～1wt%, the ldpe resin of 84～92wt%.
4. a kind of double-component Synergistic antimicrobial controlled atmosphere functional membrane according to claim 2 it is characterised in that：Described nanometer
Titanium dioxide silver exchanges diameter of particle and is less than 30nm, and silver content is 2.0 ± 0.2wt%.
5. a kind of double-component Synergistic antimicrobial controlled atmosphere functional membrane according to claim 3 it is characterised in that：Described Fructus Citri Limoniae
Acid is through 65 DEG C of drying 48h process of high-temperature blast drying oven.
6. the preparation method of a kind of double-component Synergistic antimicrobial controlled atmosphere functional membrane according to claim 1, its feature exists
In：Comprise the following steps：
(1) preparation of high concentration master batch A：Weigh in mass ratio 5～10wt% nano titanium oxide silver exchange powder body, 1～
The stearic acid of 2wt%, other fillers of 0.5～1wt%, the ldpe resin of 87～94wt%, use high speed mixer
With the rotating speed mixing 3min of 500rpm, (antimicrobial component being added, as Nano grade, has special skin effect, with LDPE
Grain surface adhesion is respond well, obvious powder and sinks to the bottom phenomenon).Batch mixing is cut again by double-screw extruding pelletizing machine
Grain, obtains high concentration master batch A.
Double-screw extruding pelletizing machine temperature sets：160℃、165℃、170℃、170℃、170℃、170℃、170℃、170℃、
170 DEG C, 170 DEG C, hopper feed speed is 10rpm, and twin screw rotating speed is 120rpm, and pelletizing speed is 4.6m/min.
(2) preparation of high concentration mother particle B：Weigh in mass ratio the citric acid of 5～10wt%, the stearic acid of 1.5～3wt%, 1～
The Pulvis Talci of 2wt%, the Calcium Carbonate of 0.5～1wt%, the ldpe resin of 84～92wt%, with high speed mixer with
The rotating speed mixing 3min of 500rpm.For improving filler and LDPE Particle Mixing Result, during batch mixing according to circumstances Deca appropriate two
Methyl-silicone oil, batch mixing is passed through the pelletizing again of double-screw extruding pelletizing machine, obtains high concentration mother particle B.
Double-screw extruding pelletizing machine temperature sets：140℃、145℃、150℃、150℃、150℃、150℃、150℃、150℃、
150℃、155℃.Hopper feed speed is 16rpm, and twin screw rotating speed is 290rpm, and pelletizing speed is 6.5m/min.
(3) preparation of double-component Synergistic antimicrobial controlled atmosphere functional membrane：Weigh the high concentration master batch of 2.5～25wt% in mass ratio
A, the high concentration mother particle B of 2.5～25wt%, the ldpe resin of 50～95wt% are through high speed batch mixing, secondary granulation
Casting film-forming afterwards.
Extrusion casting machine temperature between feed end to die head is followed successively by 145 DEG C, 150 DEG C, 150 DEG C, 150 DEG C, die head two ends temperature
Spend for 155 DEG C, interlude temperature is 150 DEG C.Screw speed is 40rpm, and curtain coating chill roll rotating speed is 2.0m/min, and carry-over pinch rolls turn
Speed is 2.2m/min, and wind-up roll rotating speed is 24rpm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108816293A (en) * | 2018-06-07 | 2018-11-16 | 高志远 | Five yuan are co-doped with nano-titanium dioxide modified purification suspension, preparation method and application |
| CN109183516A (en) * | 2018-08-31 | 2019-01-11 | 平湖市景兴包装材料有限公司 | A kind of package paper and preparation method thereof with waterproof and breathable and sterilizing fresh-keeping function |
| CN110028684A (en) * | 2018-01-12 | 2019-07-19 | 苏州润特新材料科技有限公司 | A kind of multiple groups part environment causes the preparation method of autoreaction slow-release function sexupara grain |
| CN113681993A (en) * | 2021-08-26 | 2021-11-23 | 浙江大汇新材料有限公司 | Fresh-keeping, bacteriostatic and breathable packaging film for ship fruit and vegetable transportation and preparation method thereof |
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Application publication date: 20170208 |