CN109575423A - The ecological degradative plastic film of Liaoning Area corn - Google Patents
The ecological degradative plastic film of Liaoning Area corn Download PDFInfo
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- CN109575423A CN109575423A CN201910111007.3A CN201910111007A CN109575423A CN 109575423 A CN109575423 A CN 109575423A CN 201910111007 A CN201910111007 A CN 201910111007A CN 109575423 A CN109575423 A CN 109575423A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G13/00—Protecting plants
- A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
- A01G13/0256—Ground coverings
- A01G13/0268—Mats or sheets, e.g. nets or fabrics
- A01G13/0275—Films
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/14—Greenhouses
- A01G9/1438—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Environmental Sciences (AREA)
- Soil Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Protection Of Plants (AREA)
Abstract
The present invention provides a kind of Liaoning Area corn ecological degradative plastic film, the ecological plastic matrix EBP-1502 of LLDPE and 1wt%~4wt% including 96wt%~99wt%, wherein LLDPE includes LLDPE7042 and LLDPE 0218D.Appropriate ecological plastic matrix EBP-1502 is added in the present invention in LLDPE7042 and LLDPE 0218D, obtained mulch is not only degradable, and there is the induction period for adapting to the growth and development of Liaoning Area corn crop, the heat preservation soil moisture conservation of necessary covering phase requires during can satisfy corn growth, be conducive to the growth and development of corn, crop yield is improved, and field operating procedure can be reduced.
Description
Technical field
The invention belongs to degradative plastics technical field more particularly to a kind of ecological degradative plastic films of Liaoning Area corn.
Background technique
China is second-biggest-in-the-world maize production state, and maize sown area is only second to the U.S..Liaoning Province is not only China's jade
Rice big producing province and scientific research breeding save by force, at present Liaoning year corn seeding area 217.97hm2, account for the whole province cereal crops and broadcast
The 67% of kind area, in 1448.9 ten thousand tons of corn total output of year, accounts for the 68% of the whole province's total output of grain.
Liaoning Province is located in Eurasia east bank, belongs to the continental monsoon climatic region in temperate zone.Since landform, landforms are more multiple
Miscellaneous, various regions weather is not quite similar inside the province.Total climatic characteristic is: making a clear distinction between the four seasons, algid stage is long；Rainfall is concentrated, and the wet west in east is dry；It is flat
Former wind is big, and sunshine is abundant.The whole province's various regions average temperature of the whole year upcountry gradually successively decreases mostly between 5~10 DEG C from coastal, the east area of the Liao River, coextensive with eastern and southern Liaoning Province half
Island and coastal various regions average temperature of the whole year at 9 DEG C or more, and Xifeng to new guest one with to the east of area at 5 DEG C or less.Temperature year compared with
Poor (difference of the most hot moon and most cold monthly mean temperature) due to the influence of Land-sea Distributions, greater than coastal, Southern Coast area exists in inland
Between 27~31 DEG C, remaining area is between 31~38 DEG C.The lowest temperature≤0 DEG C number of days, coastal area are 140-180 days,
He is regional between 180~220 days.Mean annual precipitation generally between 500~1000 millimeters, gradually decreases from east to west.
Up to 800~1050 millimeters of region of Southeast, northwestern is between 400~500 millimeters.Annual precipitation is concentrated mainly on
Summer, 6~August rainfall account for about the 60%~70% of annual precipitation.The most areas of year sunshine time are small for 2300~2900
When, sunshine time is reduced from the north-westward southeast.Frost-free period removes Eastern Mountain Area at 140 days hereinafter, the Dalian south and Changhai were at 200 days
More than, other areas are generally between 150~200 days.
Application of the mulch on Liaoning Province's corn crop starts from the 1980s, producing in the application of decades to corn
The raising of amount has played important function.But with the increase of the covering with ground sheeting time limit, more and more discarded mulches for being difficult to degrade are residual
It stays in the soil, hinders the infiltration of soil capillary water and Natural Water, influence the hygroscopicity of soil, to be transported to Soil Water
Movable property is raw to be hindered, and is moved it speed and is slowed down, moisture penetration amount is reduced.Meanwhile the mulch remained in the soil is also possible to make soil
Earth reduction in porosity, permeability reduce, and destroy the circulation and exchange of agricultural land soil air, further influence edaphon
Normal activity reduces soil fertility level, further results in the reduction of crop yield.
Degradative plastic film is considered as the effective way for solving farmland " white pollution ", is not only had similar with common ground film
Meteorological effect effect of increasing production can also save and manually pick up film cost.Degradative plastic film in the market mainly has photodegradation film, biology drop
Solve mulch, light/Biodegradable mulch and ecological degradative plastic film several types.The principle of photodegradation film is high molecular polymer
Photosensitive material is added in middle introducing light enhanced sensitivity group, it is made to cause photochemical reaction after absorbing solar ultraviolet light and make to divide greatly
Subchain is broken a kind of mulch for becoming low molecular mass compound, but its degradation process is by uitraviolet intensity, geographical environment, season
The restriction of the factors such as climate, variety of crops is larger, and degradation rate is difficult to accurately control；Furthermore crop field covering is in use, soil
In part cannot be degraded.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of ecological degradative plastic film of Liaoning Area corn, the present invention is mentioned
When the ecological degradative plastic film supplied is used for Liaoning Area maize planting, induction period is consistent with the maize film-covered phase, and corn yield is compared
Non- overlay film is significantly increased.
The present invention provides a kind of Liaoning Area corns with ecological degradative plastic film, the LLDPE including 96wt%~99wt%
With the ecological plastic matrix EBP-1502 of 1wt%~4wt%, wherein LLDPE includes LLDPE7042 and LLDPE 0218D.
Wherein, LLDPE 7042 is linear low density polyethylene, can be purchased from Qilu Petrochemical, Daqing petrochemical etc.；LLDPE
0218D is linear low density polyethylene, can be purchased from Canadian Nova chemistry；EBP-1502 is ecological plastic matrix, is purchased from mountain
The strong environmentally friendly Co., Ltd in eastern day.Appropriate ecological plastic matrix EBP- is added in the present invention in LLDPE7042 and LLDPE 0218D
1502, obtained mulch is not only degradable, but also can promote the growth of Liaoning Area corn, improves the yield of corn.This hair
The pulling force of the ecological degradative plastic film of bright offer, light transmittance and heat preservation soil moisture conservation performance are consistent with common ground film, original not changing
Under the premise of farming operations mode and use habit, the overlay film requirement of crop can satisfy；It is degraded controllably, harvests to crop
When, there is apparent signs of degradation in ecological degradative plastic film, and pulling force characteristic is substantially reduced, and does not influence the farming operations in the coming year；Ecology
There is no notable differences in yield for the mulch that the crop of degradative plastic film covering and common ground film are covered；Ecological degradative plastic film exists
While meeting crop demand, with degradable, ecological, environmental protective, the application characteristic of this synergy is connect.
In one embodiment, the LLDPE includes the LLDPE7042 and 25~75 parts by weight of 25~75 parts by weight
LLDPE 0218D。
In one embodiment, the ecological degradative plastic film includes the ecological plastic matrix of the LLDPE and 4wt% of 96wt%
EBP-1502。
In one embodiment, the ecological degradative plastic film includes the ecological plastic matrix of the LLDPE and 4wt% of 96wt%
EBP-1502, wherein LLDPE includes the LLDPE7042 of 25 parts by weight and the LLDPE 0218D of 75 parts by weight.
In one embodiment, the ecological degradative plastic film includes the ecological plastic matrix of the LLDPE and 2wt% of 98wt%
EBP-1502。
In one embodiment, the ecological degradative plastic film includes the ecological plastic matrix of the LLDPE and 2wt% of 98wt%
EBP-1502, wherein LLDPE includes the LLDPE7042 of 50 parts by weight and the LLDPE 0218D of 50 parts by weight.
In the present invention, the width range of the ecology degradative plastic film is 900mm-1500mm, and preferred width is 1200mm.
Thickness range is 0.006mm-0.008mm, preferably with a thickness of 0.006mm.
The present invention is not particularly limited the preparation method of the ecological degradative plastic film, after above-mentioned raw materials are squeezed out, fief
The preparation of film inflation film manufacturing machine.
Ecology degradative plastic film provided by the invention is suitable for Liaoning Area corn planting, with not overlay film, the common poly- second of covering
Alkene film is compared with covering photodegradation film, can not only be degraded, and can be improved the yield of corn.
Ecology degradative plastic film application method provided by the invention is as follows, i.e. the planting patterns of corn is as follows:
Using corn large-ridge double-row plastic-film-covered cultivation technology, carrying out the autumn immediately after crop harvest is ploughed deeply, and depth is generally 16
~25cm, fine suppression after ploughing；Selection 5~10d partially long compared with bare area breeding time, and plant type is compacter, is not easy early ageing, is degeneration-resistant anti-
The strong corn variety of characteristic of disease；When plantation, 100~120cm overlay film ditch is opened with plough, 100~120cm of ridge bottom width, ridge is high by 10~
15cm carries out deep fertilizer spraying with applicator boot, then uses medicament applying device herbicide spraying, is sowed after covering mulch with duckbilled drum-type
Device carries out punching sowing on film, and covering disk carries out earthing, finally with land presser is capable to sowing and film side earthing at carry out town
Pressure, all operations are continuously once completed.
The ecological degradative plastic film of Liaoning Area corn provided by the invention include 96wt%~99wt% LLDPE and
The ecological plastic matrix EBP-1502 of 1wt%~4wt%, wherein LLDPE includes LLDPE7042 and LLDPE 0218D.This hair
Bright that appropriate ecological plastic matrix EBP-1502 is added in LLDPE7042 and LLDPE 0218D, obtained mulch can not only drop
Solution, and there is the induction period for adapting to the growth and development of Liaoning Area corn crop, it is necessary during can satisfy corn growth
The heat preservation of covering phase, which preserves soil moisture, to be required, and is conducive to the growth and development of corn, is improved crop yield, and can reduce field operation step
Suddenly.The experimental results showed that when ecology degradative plastic film provided by the invention is for the maize film-covered plantation in Liaoning Area, induction period with
The maize film-covered phase is consistent, and corn yield is significantly increased compared to non-overlay film, compared to covering common polythene mulch and light degradation
Film yield is suitable.
Detailed description of the invention
Fig. 1 is the ecological degradative plastic film laying condition photo that the embodiment of the present invention 1 provides；
Fig. 2 is the overlay film corn growing way photo that the embodiment of the present invention 1 provides；
Fig. 3 is ecological degradative plastic film degradation situation photo after the harvest corn that the embodiment of the present invention 1 provides.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
Embodiment 1
Process equipment is the production of Laiwu in Shandong province Jing Rui plastics machinery Co., Ltd, screw diameter 45mm mulch blown film unit.
It the use of raw material is low density linear polyethylene mass fraction 96%, ecological plastic matrix EBP-1502, mass fraction
It is 4%；Wherein, low density linear polyethylene includes 25% Qilu Petrochemical 7042 and 75% Canadian Nova chemistry 0218D.
Process conditions:
Body temperature: 140 DEG C of an area, two 160 DEG C of areas, three 170 DEG C of areas, four 180 DEG C of areas, five 180 DEG C of areas, 175 DEG C of head.
Engine speed: 37 revs/min.
Product specification: thickness 0.006mm, width 1200mm.
Method as described above is in Liaoning Area maize planting, as a result referring to Fig. 1, Fig. 2, Fig. 3, Tables 1 and 2, Fig. 1
For the ecological degradative plastic film laying condition photo that the embodiment of the present invention 1 provides, Fig. 2 is that the overlay film that the embodiment of the present invention 1 provides is beautiful
Rice growing way photo, Fig. 3 are ecological degradative plastic film degradation situation photo after the harvest corn that the embodiment of the present invention 1 provides, and table 1 is ground
Membrane degradation performance evaluation, table 2 are corn growing way and Yield evaluation.
Embodiment 2
Process equipment is the production of Laiwu in Shandong province Jing Rui plastics machinery Co., Ltd, screw diameter 45mm mulch blown film unit.Work
Skill condition:
It the use of raw material is low density linear polyethylene mass fraction 98%, ecological plastic matrix EBP-1502, mass fraction
It is 2%；Wherein, low density linear polyethylene includes 50% Qilu Petrochemical 7042 and 50% Canadian Nova chemistry 0218D.
Body temperature: 140 DEG C of an area, two 155 DEG C of areas, three 165 DEG C of areas, four 175 DEG C of areas, five 180 DEG C of areas, 170 DEG C of head.
Engine speed: 40 revs/min.
Product specification: thickness 0.006mm, width 1200mm.
Method as described above is in Liaoning Area maize planting, and as a result referring to Tables 1 and 2, table 1 is Plastic-film disintegration
It can evaluate, table 2 is corn growing way and Yield evaluation.
Comparative example 1
Corn planting method is same as Example 1, and difference is, not overlay film.
Method as described above is in Liaoning Area maize planting, and as a result referring to Tables 1 and 2, table 1 is Plastic-film disintegration
It can evaluate, table 2 is corn growing way and Yield evaluation.
Comparative example 2
Corn planting method is same as Example 1, and difference is, covers polyethylene ground film.
Method as described above is in Liaoning Area maize planting, and as a result referring to Tables 1 and 2, table 1 is Plastic-film disintegration
It can evaluate, table 2 is corn growing way and Yield evaluation.
Comparative example 3
Corn planting method is same as Example 1, and difference is, covers photodegradation film, the photodegradation film composition
Are as follows: 7,042 25 parts of Qilu Petrochemical LLDPE, Canadian 75 parts of Nova chemistry 0218D, photosensitizer N, N- di-n-butyl two is thio
3 parts of carbamic acid iron, 17 parts of starch.
Method as described above is in Liaoning Area maize planting, and as a result referring to Tables 1 and 2, table 1 is Plastic-film disintegration
It can evaluate, table 2 is corn growing way and Yield evaluation.
Comparative example 4
Corn planting method is same as Example 1, and difference is, covers ecological plastic film, is formulated as follows:
7042 96wt% of Qilu Petrochemical LLDPE
Shandong Ecology Benign Plastics Technology Co., Ltd. EBP-1502 4wt%.
Method as described above is in Liaoning Area maize planting, and as a result referring to Tables 1 and 2, table 1 is Plastic-film disintegration
It can evaluate, table 2 is corn growing way and Yield evaluation.
Comparative example 5
Corn planting method is same as Example 1, and difference is, covers ecological plastic film, is formulated as follows:
Canadian Nova chemistry 0218D 96wt%
Shandong Ecology Benign Plastics Technology Co., Ltd. EBP-1601 4wt%.
Method as described above is in Liaoning Area maize planting, and as a result referring to Tables 1 and 2, table 1 is Plastic-film disintegration
It can evaluate, table 2 is corn growing way and Yield evaluation.
Comparative example 6
Corn planting method is same as Example 1, and difference is, covers ecological plastic film, is formulated as follows:
Low density linear polyethylene mass fraction 96%, degradable master batch EBP-1601, mass fraction 4%；Wherein, low close
Spending linear polyethylene includes 25% Qilu Petrochemical 7042 and 75% Canadian Nova chemistry 0218D.
Method as described above is in Liaoning Area maize planting, and as a result referring to Tables 1 and 2, table 1 is Plastic-film disintegration
It can evaluate, table 2 is corn growing way and Yield evaluation.
1 Plastic-film disintegration performance evaluation of table
| Induction period (d) | Residual rate (%) | Reserved elongation at break (%) | |
| Comparative example 2 | 146 | 94 | 84.2 |
| Comparative example 3 | 103 | 85 | 75.3 |
| Comparative example 4 | 78 | 42 | 0 |
| Comparative example 5 | 38 | 26 | 0 |
| Comparative example 6 | 33 | 14 | 0 |
| Embodiment 1 | 82 | 47 | 0 |
| Embodiment 2 | 90 | 53 | 0 |
2 corn growing way of table and Yield evaluation
| Stem height (cm) | Main root is long (cm) | Yield (kg/hm2) | |
| Comparative example 1 | 275.45 | 13.36 | 10293.26 |
| Comparative example 2 | 283.83 | 16.12 | 11652.73 |
| Comparative example 3 | 282.12 | 15.24 | 11630.47 |
| Comparative example 4 | 274.63 | 15.26 | 11231.26 |
| Comparative example 5 | 280.78 | 15.39 | 11320.54 |
| Comparative example 6 | 280.63 | 15.47 | 11421.69 |
| Embodiment 1 | 280.21 | 16.13 | 11662.21 |
| Embodiment 2 | 283.45 | 15.64 | 11748.46 |
By Tables 1 and 2 it is found that when ecology degradative plastic film provided by the invention is for the maize film-covered plantation in Liaoning Area,
Induction period is consistent with the maize film-covered phase, and corn yield is significantly increased compared to non-overlay film, compared to covering common polythene mulch and
Photodegradation film yield is suitable.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of ecological degradative plastic film of Liaoning Area corn, which is characterized in that LLDPE including 96wt%~99wt% and
The ecological plastic matrix EBP-1502 of 1wt%~4wt%, wherein the LLDPE includes LLDPE7042 and LLDPE 0218D.
2. ecology degradative plastic film according to claim 1, which is characterized in that the LLDPE includes 25~75 parts by weight
The LLDPE 0218D of LLDPE7042 and 25~75 parts by weight.
3. ecology degradative plastic film according to claim 2, which is characterized in that the life of LLDPE and 4wt% including 96wt%
State plastic matrix EBP-1502.
4. ecology degradative plastic film according to claim 3, which is characterized in that the LLDPE includes 25 parts by weight
The LLDPE 0218D of LLDPE7042 and 75 parts by weight.
5. ecology degradative plastic film according to claim 3, which is characterized in that the life of LLDPE and 2wt% including 98wt%
State plastic matrix EBP-1502.
6. ecology degradative plastic film according to claim 5, which is characterized in that the LLDPE includes 50 parts by weight
The LLDPE 0218D of LLDPE7042 and 50 parts by weight.
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| CN201910111007.3A CN109575423A (en) | 2019-02-12 | 2019-02-12 | The ecological degradative plastic film of Liaoning Area corn |
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| CN201910111007.3A CN109575423A (en) | 2019-02-12 | 2019-02-12 | The ecological degradative plastic film of Liaoning Area corn |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112062987A (en) * | 2020-07-30 | 2020-12-11 | 上海森韦得实业有限公司 | Preparation method of biodegradable heat-shrinkable film |
| CN112063055A (en) * | 2020-07-30 | 2020-12-11 | 上海森韦得实业有限公司 | Preparation method of biodegradable heat-shrinkable film |
-
2019
- 2019-02-12 CN CN201910111007.3A patent/CN109575423A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112062987A (en) * | 2020-07-30 | 2020-12-11 | 上海森韦得实业有限公司 | Preparation method of biodegradable heat-shrinkable film |
| CN112063055A (en) * | 2020-07-30 | 2020-12-11 | 上海森韦得实业有限公司 | Preparation method of biodegradable heat-shrinkable film |
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