CN107022134A - A kind of environment-friendly degradable material producing process - Google Patents
A kind of environment-friendly degradable material producing process Download PDFInfo
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- CN107022134A CN107022134A CN201710314342.4A CN201710314342A CN107022134A CN 107022134 A CN107022134 A CN 107022134A CN 201710314342 A CN201710314342 A CN 201710314342A CN 107022134 A CN107022134 A CN 107022134A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0024—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Glucans; (beta-1,3)-D-Glucans, e.g. paramylon, coriolan, sclerotan, pachyman, callose, scleroglucan, schizophyllan, laminaran, lentinan or curdlan; (beta-1,6)-D-Glucans, e.g. pustulan; (beta-1,4)-D-Glucans; (beta-1,3)(beta-1,4)-D-Glucans, e.g. lichenan; Derivatives thereof
- C08B37/0027—2-Acetamido-2-deoxy-beta-glucans; Derivatives thereof
- C08B37/003—Chitin, i.e. 2-acetamido-2-deoxy-(beta-1,4)-D-glucan or N-acetyl-beta-1,4-D-glucosamine; Chitosan, i.e. deacetylated product of chitin or (beta-1,4)-D-glucosamine; Derivatives thereof
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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
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/08—Cellulose derivatives
- C08L1/26—Cellulose ethers
- C08L1/28—Alkyl ethers
- C08L1/286—Alkyl ethers substituted with acid radicals, e.g. carboxymethyl cellulose [CMC]
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- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
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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
- 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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Abstract
The invention discloses a kind of environment-friendly degradable material producing process, comprise the following steps:S1. material is prepared:40 120 parts of 80 100 parts of crab shell shrimp shell mixture, 20 50 parts of 8 12% acid solution, 20 50 parts of 8 12% alkaline solution, 40 120 parts of thermoplastic polymer and 20 50% carboxymethyl celluloses;S2. the preparation of chitin:It will be crushed after 80 100 parts of clean dries of crab shell, 15 30min extracted with boiling water, be put into 2 10 times of 8 12%HCl solution of amount and soak 0.5 4h at room temperature, be washed to neutrality, be subsequently placed in 2 10 times of 8 12%NaOH solution of amount and boil 0.5 4h.A kind of environment-friendly degradable material producing process proposed by the present invention, its mechanical strength is good, plasticity strong, and does not produce the material of welding in decomposable process, thus with wide market prospects.
Description
Technical field
The invention belongs to technical field of material, be particularly suitable for use in environment-friendly degradable field of material preparation.
Background technology
With increasing rapidly for plastics yield, the post processing of waste plastic and the environmental pollution that causes are increasingly by each
The concern of state.The environmental pollution that plastic garbage is caused turns into global problem.Non-biodegradation synthetic material is especially moulded
Material packaging material can bring great negative effect, i.e., so-called " white pollution " after discarded to environment.It is reported that plastics are just
Accumulated with annual 25000000 tons of speed in nature.How to tackle " white pollution " becomes asking for people's common concern
Topic.The initial stage nineties, high-molecular scholars pointed out that C-C keys can not be digested and hydrolyzed, and scission of link unless photodissociation is real with oxidic polyethylene
Simply resided on border as fragment in soil.Therefore exploitation totally biodegradable material turns into a new problem.
Current plastic garbage inflow recycling market daily only less than 30% ton, and nearly 70% ton of plastic garbage
All it is landfilled processing.It is difficult degraded that these rubbish, which are largely, fills not only land occupation resource, and typically needing more than 100
Year could degrade.It result in the quickening of refuse landfill speed.Also bring difficulty to the greening and exploitation after closing simultaneously.Root
The characteristics of being difficult to decompose according to plastics, rot, so that the formula and production technology that improve plastics are started with, has succeeded in developing some easily point
The novel plastic of solution, these plastics under certain condition, can be degraded to simple material by certain time or be decomposed by the microorganisms.
Exploitation degradative plastics is an effective way for solving plastic pollution.
The content of the invention
The technical problem existed based on background technology, the present invention proposes a kind of environment-friendly degradable material producing process.
A kind of environment-friendly degradable material producing process proposed by the present invention, comprises the following steps:
S1. material is prepared:80-100 parts of crab shell shrimp shell mixture, 20-50 parts of 8-12% acid solutions, 8-12% alkaline solutions 20-
40-120 parts of 50 parts, 40-120 parts of thermoplastic polymer and 20-50% carboxymethyl celluloses;
S2. the preparation of chitin:It will be crushed after 80-100 parts of clean dries of crab shell, extract 15-30min with boiling water, be put into 2-10
0.5-4h is soaked at room temperature in amount 8-12%HCl solution again, is washed to neutrality, is subsequently placed in 2-10 times and measures in 8-12%NaOH solution
0.5-4h is boiled, is cooled to after room temperature and is washed to neutrality, then the soft shell after base extraction is placed in room temperature in 8-12%HCl solution
0.5-4h is soaked, neutrality is washed to, plus 8-12%NaOH solution boils 15-30min, so handles 2 times repeatedly, filtering, by powder
End is washed to neutrality, is weighed after drying;
S3. the preparing chitosan from chitin prepared in S2 is utilized:Chitin acts on the acetyl group sloughed in molecule, transformation through concentrated base
It is chitosan for soluble chitin, chitin is dissolved in 2-10 times of 20-80%NaOH solution, 1-5h is boiled, is washed to neutrality
After be placed in 20-80%NaOH solution, boil 0.5-5h, so operate 3 times repeatedly, gained precipitation is dried under reduced pressure, then washes 2 with ethanol
It is secondary, dry, obtain chitosan sterling;
S4. in Ph1.0-3.0 hydrochloric acid solution, the chitosan prepared in 20-50% carboxymethyl cellulose and S3 is made altogether
Mixed thing A;
S5. the polythene thermoplastic polymer containing 10-25% will be added in the blend A in S4, as coupling agent, by blend
Polymerization, is made bulk density for 10~20Kg/m3Biodegradable plastic.
It is preferred that, in the S1, prepare material:90 parts of crab shell shrimp shell mixture, 35 parts of 10% acid solution, 10% alkalescence are molten
80 parts of 35 parts of liquid, 80 parts of thermoplastic polymer and 35% carboxymethyl cellulose.
It is preferred that, in the S2, the preparation of chitin:It will crush, extracted with boiling water after 90 parts of clean dries of crab shell
25min, is put into 6 times of amount 10%HCl solution and soaks 2h at room temperature, be washed to neutrality, is subsequently placed in 6 times of amount 10%NaOH solution
2h is boiled, is cooled to after room temperature and is washed to neutrality, then the soft shell after base extraction is placed in soaking at room temperature 2h in 10%HCl solution,
Neutrality is washed to, plus 10%NaOH solution boils 25min, so handles 2 times repeatedly, powder is washed to neutrality by filtering, is dried
After weigh.
It is preferred that, in the S3, utilize the preparing chitosan from chitin prepared in S2:Chitin is sloughed through concentrated base effect
Acetyl group in molecule, is changed into the chitin i.e. chitosan of solubility, chitin is dissolved in into 6 times of 60%NaOH solution, boiled
3h, is washed to after neutrality and is placed in 60%NaOH solution, boils 3h, so operates 3 times repeatedly, and gained precipitation is dried under reduced pressure, then uses second
Alcohol is washed 2 times, is dried, is obtained chitosan sterling.
It is preferred that, in the S4, in Ph2.0 hydrochloric acid solution, by what is prepared in 35% carboxymethyl cellulose and S3
Blend A is made in chitosan.
It is preferred that, in the S5, it will be added in the blend A in S4 containing 15% polythene thermoplastic polymer, as
Coupling agent, blend is polymerize, and bulk density is made for 15Kg/m3Biodegradable plastic.
There is light, bio-degradable function, it is biological by the light degradation mechanism of photosensitizer system and chitin in the present invention
Mechanism of degradation combines, and on the one hand on the other hand can be reached with accelerated degradation using the adjustable characteristic of photosensitizer system
Think the purpose of control degraded.
The present invention provides a kind of degradable environment-friendly material, and the mechanical strength is good, plasticity strong, widely used, and point
The material of welding is not produced in solution preocess, the requirement of green degraded is met, thus with wide market prospects.
Embodiment
The present invention is made with reference to specific embodiment further to explain.
Embodiment one
A kind of environment-friendly degradable material producing process proposed by the present invention, comprises the following steps:
S1. material is prepared:80 parts of crab shell shrimp shell mixture, 20 parts of 8% acid solution, 20 parts of 8% alkaline solution, thermoplastic polymer
40 parts and 40 parts of 20% carboxymethyl cellulose;
S2. the preparation of chitin:It will be crushed after 80 parts of clean dries of crab shell, 15min extracted with boiling water, be put into 2 times of amount 8%HCl molten
0.5h is soaked in liquid at room temperature, neutrality is washed to, is subsequently placed in 2 times of amount 8%NaOH solution and boils 0.5h, be cooled to after room temperature
Neutrality is washed to, then the soft shell after base extraction is placed in soaking at room temperature 0.5h in 8%HCl solution, neutrality is washed to, plus 8%
NaOH solution boils 15min, so handles 2 times repeatedly, and powder is washed to neutrality by filtering, is weighed after drying;
S3. the preparing chitosan from chitin prepared in S2 is utilized:Chitin acts on the acetyl group sloughed in molecule, transformation through concentrated base
It is chitosan for soluble chitin, chitin is dissolved in 2 times of 20%NaOH solution, 1h is boiled, is washed to after neutrality and is placed in
20%NaOH solution, boils 0.5h, so operates 3 times repeatedly, and gained precipitation is dried under reduced pressure, then is washed 2 times with ethanol, is dried, is obtained shell
Glycan sterling;
S4. in Ph3.0 hydrochloric acid solution, blend A is made in the chitosan prepared in 20% carboxymethyl cellulose and S3;
S5. it will add containing 10% polythene thermoplastic polymer, as coupling agent, blend gathered in the blend A in S4
Close, bulk density is made for 10Kg/m3Biodegradable plastic.
Embodiment two
A kind of environment-friendly degradable material producing process proposed by the present invention, comprises the following steps:
S1. material is prepared:85 parts of crab shell shrimp shell mixture, 30 parts of 10% acid solution, 30 parts of 10% alkaline solution, thermoplasticity polymerization
50 parts of 50 parts of thing and 30% carboxymethyl cellulose;
S2. the preparation of chitin:It will be crushed after 85 parts of clean dries of crab shell, 20min extracted with boiling water, be put into 5 times of amount 10%HCl
1h is soaked in solution at room temperature, neutrality is washed to, is subsequently placed in 5 times of amount 10%NaOH solution and boils 1h, be cooled to water after room temperature
Neutrality is washed till, then the soft shell after base extraction is placed in soaking at room temperature 1h in 10%HCl solution, neutrality, plus 10%NaOH is washed to
Solution boils 20min, so handles 2 times repeatedly, and powder is washed to neutrality by filtering, is weighed after drying;
S3. the preparing chitosan from chitin prepared in S2 is utilized:Chitin acts on the acetyl group sloughed in molecule, transformation through concentrated base
It is chitosan for soluble chitin, chitin is dissolved in 5 times of 10%NaOH solution, 2h is boiled, is washed to after neutrality and is placed in
10%NaOH solution, boils 2h, so operates 3 times repeatedly, and gained precipitation is dried under reduced pressure, then is washed 2 times with ethanol, is dried, and obtains shell and gathers
Sugared sterling;
S4. in Ph2.5 hydrochloric acid solution, blend A is made in the chitosan prepared in 30% carboxymethyl cellulose and S3;
S5. it will add containing 15% polythene thermoplastic polymer, as coupling agent, blend gathered in the blend A in S4
Close, bulk density is made for 15Kg/m3Biodegradable plastic.
Embodiment three
A kind of environment-friendly degradable material producing process proposed by the present invention, comprises the following steps:
S1. material is prepared:90 parts of crab shell shrimp shell mixture, 40 parts of 10% acid solution, 40 parts of 10% alkaline solution, thermoplasticity polymerization
60 parts of 60 parts of thing and 30% carboxymethyl cellulose;
S2. the preparation of chitin:It will be crushed after 90 parts of clean dries of crab shell, 25min extracted with boiling water, be put into 6 times of amount 10%HCl
1h is soaked in solution at room temperature, neutrality is washed to, is subsequently placed in 6 times of amount 10%NaOH solution and boils 1h, be cooled to water after room temperature
Neutrality is washed till, then the soft shell after base extraction is placed in soaking at room temperature 1h in 10%HCl solution, neutrality, plus 10%NaOH is washed to
Solution boils 25min, so handles 2 times repeatedly, and powder is washed to neutrality by filtering, is weighed after drying;
S3. the preparing chitosan from chitin prepared in S2 is utilized:Chitin acts on the acetyl group sloughed in molecule, transformation through concentrated base
It is chitosan for soluble chitin, chitin is dissolved in 6 times of 60%NaOH solution, 2h is boiled, is washed to after neutrality and is placed in
60%NaOH solution, boils 2h, so operates 3 times repeatedly, and gained precipitation is dried under reduced pressure, then is washed 2 times with ethanol, is dried, and obtains shell and gathers
Sugared sterling;
S4. in Ph2.0 hydrochloric acid solution, blend A is made in the chitosan prepared in 30% carboxymethyl cellulose and S3;
S5. it will add containing 20% polythene thermoplastic polymer, as coupling agent, blend gathered in the blend A in S4
Close, bulk density is made for 15Kg/m3Biodegradable plastic.
Example IV
A kind of environment-friendly degradable material producing process proposed by the present invention, comprises the following steps:
S1. material is prepared:95 parts of crab shell shrimp shell mixture, 45 parts of 10% acid solution, 45 parts of 10% alkaline solution, thermoplasticity polymerization
70 parts of 70 parts of thing and 30% carboxymethyl cellulose;
S2. the preparation of chitin:It will be crushed after 95 parts of clean dries of crab shell, 25min extracted with boiling water, be put into 8 times of amount 10%HCl
3h is soaked in solution at room temperature, neutrality is washed to, is subsequently placed in 8 times of amount 10%NaOH solution and boils 3h, be cooled to water after room temperature
Neutrality is washed till, then the soft shell after base extraction is placed in soaking at room temperature 3h in 10%HCl solution, neutrality, plus 10%NaOH is washed to
Solution boils 25min, so handles 2 times repeatedly, and powder is washed to neutrality by filtering, is weighed after drying;
S3. the preparing chitosan from chitin prepared in S2 is utilized:Chitin acts on the acetyl group sloughed in molecule, transformation through concentrated base
It is chitosan for soluble chitin, chitin is dissolved in 8 times of 70%NaOH solution, 4h is boiled, is washed to after neutrality and is placed in
70%NaOH solution, boils 4h, so operates 3 times repeatedly, and gained precipitation is dried under reduced pressure, then is washed 2 times with ethanol, is dried, and obtains shell and gathers
Sugared sterling;
S4. in Ph1.5 hydrochloric acid solution, blend A is made in the chitosan prepared in 25% carboxymethyl cellulose and S3;
S5. it will add containing 20% polythene thermoplastic polymer, as coupling agent, blend gathered in the blend A in S4
Close, bulk density is made for 15Kg/m3Biodegradable plastic.
Embodiment five
A kind of environment-friendly degradable material producing process proposed by the present invention, comprises the following steps:
S1. material is prepared:100 parts of crab shell shrimp shell mixture, 50 parts of 10% acid solution, 50 parts of 10% alkaline solution, thermoplastic poly
120 parts of 120 parts of compound and 50% carboxymethyl cellulose;
S2. the preparation of chitin:It will be crushed after 100 parts of clean dries of crab shell, 30min extracted with boiling water, be put into 10 times of amounts 10%
4h is soaked in HCl solution at room temperature, neutrality is washed to, is subsequently placed in 10 times of amount 10%NaOH solution and boils 4h, be cooled to room temperature
After be washed to neutrality, then the soft shell after base extraction is placed in soaking at room temperature 4h in 10%HCl solution, is washed to neutrality, plus 10%
NaOH solution boils 30min, so handles 2 times repeatedly, and powder is washed to neutrality by filtering, is weighed after drying;
S3. the preparing chitosan from chitin prepared in S2 is utilized:Chitin acts on the acetyl group sloughed in molecule, transformation through concentrated base
It is chitosan for soluble chitin, chitin is dissolved in 10 times of 80%NaOH solution, 5h is boiled, is washed to after neutrality and is placed in
80%NaOH solution, boils 5h, so operates 3 times repeatedly, and gained precipitation is dried under reduced pressure, then is washed 2 times with ethanol, is dried, and obtains shell and gathers
Sugared sterling;
S4. in Ph1.0 hydrochloric acid solution, blend A is made in the chitosan prepared in 50% carboxymethyl cellulose and S3;
S5. it will add containing 25% polythene thermoplastic polymer, as coupling agent, blend gathered in the blend A in S4
Close, bulk density is made for 20Kg/m3Biodegradable plastic.
By what is prepared in the embodiment of the present invention one~five there is environment-friendly degradable material stability and degradation characteristic to carry out respectively
Analysis, draws following result:
Embodiment | One | Two | Three | Four | Five |
Stability | 80.5% | 82% | 90% | 92% | 92.5% |
Degradability | 97.5% | 98.7% | 94.9% | 96.1% | 99.3% |
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, it is any
Those familiar with the art the invention discloses technical scope in, technique according to the invention scheme and its invention
Design is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (6)
1. a kind of environment-friendly degradable material producing process, it is characterised in that comprise the following steps:
S1. material is prepared:80-100 parts of crab shell shrimp shell mixture, 20-50 parts of 8-12% acid solutions, 8-12% alkaline solutions 20-
40-120 parts of 50 parts, 40-120 parts of thermoplastic polymer and 20-50% carboxymethyl celluloses;
S2. the preparation of chitin:It will be crushed after 80-100 parts of clean dries of crab shell, extract 15-30min with boiling water, be put into 2-10
0.5-4h is soaked at room temperature in amount 8-12%HCl solution again, is washed to neutrality, is subsequently placed in 2-10 times and measures in 8-12%NaOH solution
0.5-4h is boiled, is cooled to after room temperature and is washed to neutrality, then the soft shell after base extraction is placed in room temperature in 8-12%HCl solution
0.5-4h is soaked, neutrality is washed to, plus 8-12%NaOH solution boils 15-30min, so handles 2 times repeatedly, filtering, by powder
End is washed to neutrality, is weighed after drying;
S3. the preparing chitosan from chitin prepared in S2 is utilized:Chitin acts on the acetyl group sloughed in molecule, transformation through concentrated base
It is chitosan for soluble chitin, chitin is dissolved in 2-10 times of 20-80%NaOH solution, 1-5h is boiled, is washed to neutrality
After be placed in 20-80%NaOH solution, boil 0.5-5h, so operate 3 times repeatedly, gained precipitation is dried under reduced pressure, then washes 2 with ethanol
It is secondary, dry, obtain chitosan sterling;
S4. in Ph1.0-3.0 hydrochloric acid solution, the chitosan prepared in 20-50% carboxymethyl cellulose and S3 is made altogether
Mixed thing A;
S5. the polythene thermoplastic polymer containing 10-25% will be added in the blend A in S4, as coupling agent, by blend
Polymerization, is made bulk density for 10~20Kg/m3Biodegradable plastic.
2. a kind of environment-friendly degradable material producing process according to claim 1, it is characterised in that:In the S1, prepare material
Material:90 parts of crab shell shrimp shell mixture, 35 parts of 10% acid solution, 35 parts of 10% alkaline solution, 80 parts of thermoplastic polymer and 35% carboxylic
80 parts of methylcellulose.
3. a kind of environment-friendly degradable material producing process according to claim 1, it is characterised in that:In the S2, chitin
Preparation:It will be crushed after 90 parts of clean dries of crab shell, 25min extracted with boiling water, be put into 6 times of amount 10%HCl solution and soak at room temperature
2h is steeped, neutrality is washed to, is subsequently placed in 6 times of amount 10%NaOH solution and boils 2h, be cooled to after room temperature and be washed to neutrality, then by alkali
Soft shell after liquid processing is placed in soaking at room temperature 2h in 10%HCl solution, is washed to neutrality, plus 10%NaOH solution boils 25min,
So handle 2 times repeatedly, powder is washed to neutrality by filtering, is weighed after drying.
4. a kind of environment-friendly degradable material producing process according to claim 1, it is characterised in that:In the S3, S2 is utilized
The preparing chitosan from chitin of middle preparation:Chitin acts on the acetyl group sloughed in molecule through concentrated base, is changed into the first of solubility
Shell element is chitosan, and chitin is dissolved in into 6 times of 60%NaOH solution, 3h is boiled, is washed to after neutrality and is placed in 60%NaOH solution, boil
3h is boiled, is so operated 3 times repeatedly, gained precipitation is dried under reduced pressure, then is washed 2 times with ethanol, is dried, is obtained chitosan sterling.
5. a kind of environment-friendly degradable material producing process according to claim 1, it is characterised in that:In the S4,
In Ph2.0 hydrochloric acid solution, blend A is made in the chitosan prepared in 35% carboxymethyl cellulose and S3.
6. a kind of environment-friendly degradable material producing process according to claim 1, it is characterised in that:In the S5, by S4
Blend A in add containing 15% polythene thermoplastic polymer, as coupling agent, blend is polymerize, bulk density is made
For 15Kg/m3Biodegradable plastic.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108129870A (en) * | 2017-12-26 | 2018-06-08 | 沈于酰 | Degradation material, preparation method and applications |
CN108373563A (en) * | 2018-03-28 | 2018-08-07 | 方建波 | A kind of preparation method of biodegradable agricultural film |
-
2017
- 2017-05-06 CN CN201710314342.4A patent/CN107022134A/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108129870A (en) * | 2017-12-26 | 2018-06-08 | 沈于酰 | Degradation material, preparation method and applications |
CN108373563A (en) * | 2018-03-28 | 2018-08-07 | 方建波 | A kind of preparation method of biodegradable agricultural film |
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Application publication date: 20170808 |