CN104926272A - 3D printing material, preparation method, application method and application - Google Patents
3D printing material, preparation method, application method and application Download PDFInfo
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- CN104926272A CN104926272A CN201510322782.5A CN201510322782A CN104926272A CN 104926272 A CN104926272 A CN 104926272A CN 201510322782 A CN201510322782 A CN 201510322782A CN 104926272 A CN104926272 A CN 104926272A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a 3D printing material, a preparation method, an application method and application, and belongs to the field of materials. The preparation method comprises the steps that (1) wheat straw and wheat bran particles are mixed and smashed; (2) diatomaceous earth and calcium carbonate are added to the mixed particles, stirred and mixed, and then the mixture is pyrolyzed; (3) water is weighed, full corn flour and Arabic gum are added to water and heated through a container with a sealing cover and a stirrer arranged inside, sodium tripolyphosphate, acetic ether and polylactic acid are added to the corn flour solution, stirring and cooling are carried out at the same time, and a solution A is obtained; (4) the mixed particles obtained after pyrolysis in the step (2) is added to the solution A obtained in the step (3) to obtain the material for 3D printing. The invention also discloses prepared materials and the application. The preparation method utilizes biologic materials, material selection is easy, cost is low, particularly, the wheat straw and the wheat bran are agricultural waste, waste materials are utilized, and ecological benefits are remarkable.
Description
Technical field
The invention belongs to Material Field; Specifically, a kind of 3D printed material and preparation method and using method and application is related to.
Background technology
In recent years, 3D printing technique is being promoted gradually, and the technology of 3D printer is also day by day ripe, along with development and the application popularization of printer technology, 3D prints and also starts to apply in agricultural, but also there is the characteristic of oneself in agricultural, existing exactly 3D printed material is adopt edible wax, plastics or alloy mostly, these materials are used for artwork and have higher value, but for needs short-period used, then easily cause the waste of material and the pollution of environment, especially high cost, limit it and use; So a kind of cost is low, the printed material of environmental protection in the urgent need to finding.Along with the development of China's agricultural, the cultivated area of grain is declining always, and everybody is general toward planting economic crops future development, especially polyhouse-based agriculture and industrialized agriculture aspect achieve huge development, and along with the development of polyhouse-based agriculture and industrialized agriculture aspect, also have in agricultural and much need to adopt 3D to print, such as need to use a large amount of seedling-raising cup in the nursery stage, mainly based on using seedling-raising cup breeding, nursery is convenient to concentrate and is cultivated and transplant, significantly improve economic benefit, save seedling cost, especially in flowers, vegetables, the agricultural planting aspects such as melon and fruit are most widely used, but present seedling-raising cup.The use procedure of seedling-raising cup is, first neatly in nursery pond put seedling-raising cup, then in seedling-raising cup, substratum is put into, finally seed is planted in the medium, Deng seed germination, seedling grows to a certain degree, together with seedling-raising cup, seedling is transplanted to large Tanaka, after waiting for farm crop harvesting, seedling-raising cup is also retained in farmland, but existing seedling-raising cup, its quality mostly is plastic production, use rear seedling-raising cup to be retained in farmland easily to pollute soil, not only affect the water system flowing of soil, but also the root growth of plant is affected, final accumulation increases, and forms white pollution, causes soil compaction.What also have great demand equally is exactly a lot of formwork for placing built, the shape that such as decorative sheet, door plaque etc. are unique, only need short-period used, and only use once, if material plastic or alloy material, this certainly will cause great waste, and if these breeding cups and building formwork for placing adopt 3D printer to complete, then greatly can reduce production cost and environmental protection cost.
Summary of the invention
the problem solved
The material cost adopted is printed high for existing 3D, decompose slow, to the problem that environment easily pollutes, the invention provides a kind of 3D printed material and preparation method and using method and application, the economic environmental protection of the material obtained, intensity is high in a short time, again can fast decoupled after certain hour, cost is low, environmental protection, easy to use.
technical scheme
For solving the problem, the present invention adopts following technical scheme.
A preparation method for 3D printed material, the steps include:
(1) the wheat bran particle powder mix of the wheat stalk of 40-80 mass parts and 30-50 mass parts is broken into 100-200 object particle, obtains the composite grain after pulverizing;
(2) diatomite and 0.5-2 part calcium carbonate that add 7-10 mass parts in above-mentioned composite grain are uniformly mixed, then be placed in sealed vessel and heat 20-30 min, Heating temperature is 130-180 DEG C, synchronously cools after heating with sealed vessel, obtains the composite grain after pyrolysis;
(3) water of 100 mass parts is taken, the full Semen Maydis powder (full Semen Maydis powder refers to and directly corn grain pulverized the flour obtained) of 10-18 mass parts and the gum arabic of 2-5 mass parts is added in water, heat with sealing cover and the inner container being provided with agitator after stirring into Semen Maydis powder solution, heat while stirring, Semen Maydis powder solution keeps boiling 5-10 min, then heating is stopped, open sealing cover, the tripoly phosphate sodium STPP of 3-8 mass parts is added in Semen Maydis powder solution, (poly(lactic acid) that the present invention uses is Powdered for the vinyl acetic monomer of 3-6 mass parts and the poly(lactic acid) of 1-4 mass parts, order number is lower than 150 orders), cool while stirring, obtain solution A,
(4) composite grain after the pyrolysis obtained in step (2) is joined in the solution A obtained in step (3), stir 5-10 min, obtain the material printed for 3D.
Preferably, the quality group of described each material becomes: wheat stalk particle: 60 parts; Wheat bran particle 40 parts; Vinyl acetic monomer 5 parts; 8 parts, diatomite; 1 part, calcium carbonate; Poly(lactic acid) 3 parts; Full Semen Maydis powder 14 parts; Gum arabic 3 parts; Tripoly phosphate sodium STPP 5 parts; 100 parts, water.
Preferably, heat 25 min in sealed vessel in described step (2), Heating temperature is 150 DEG C.
3D printed material obtained above.
The application of foregoing 3D printed material in agricultural.
A using method for 3D printed material, the steps include:
Select foregoing 3D printed material, then installed to by 3D printed material in the print cartridge of 3D printer, before starting printer, printer starts the shape required for printing after being heated to 90-98 DEG C to 3D printed material.
Preferably, the product of printing is that breeding cup or building build formwork.
The application of gum arabic in 3D printed material.
Utilize biological material in preparation method of the present invention, draw materials simple, cost is low, especially wheat stalk and wheat bran are all agricultural wastes, and the present invention is by its utilization of waste material, and ecological benefits are obvious, the gum arabic added improves its flowing property, all the other compositions such as vinyl acetic monomer, diatomite, poly(lactic acid), calcium carbonate, the materials such as full Semen Maydis powder and tripoly phosphate sodium STPP, price is not high and consumption is little, and complicated reticulated structure, energy fast shaping, intensity is high, the time that prepared breeding cup uses can reach 45 days, meet breeding requirement, and after kind of transplantation of seedlings, breeding cup corrodes gradually, decompose, back to nature, the nutritive substances such as N P and K can also be provided in decomposition course for plant absorption, the building formwork for placing printed, thickness only needs 5 mm namely to can be used for the side plate of concrete placement.
beneficial effect
Compared to prior art, beneficial effect of the present invention is:
(1) preparation method of 3D printed material of the present invention, adopt rural area be easy to get most and the wheat stalk of cheapness and wheat bran as major ingredient, cost is low, result of use is good, then vinyl acetic monomer is adopted, diatomite, poly(lactic acid), calcium carbonate, the materials such as full Semen Maydis powder and tripoly phosphate sodium STPP serve as the effect of tackiness agent and stablizer, gum arabic can be readjusted prices its mobility, after being heated to 90-98 DEG C during use, mobility is best, for printed material, fast cooling shaping, a large amount of netted side chains is formed in the material obtained, intensity is high, beautiful appearance, use rear decomposition fast, display point-like is decomposed, finally be only large-area decomposition, can as Fertilizer application after decomposition, turn waste into wealth,
(2) 3D printed material of the present invention being widely used in agricultural, effective;
(3) the present invention adds a process approach to wheat stalk, real utilization of waste material, meets national industry demand;
(4) can start after 3D printed material of the present invention is heated to 90-98 DEG C to print, condition is low, easy to operate.
Embodiment
Below in conjunction with in specific embodiment, the present invention is described in detail.
embodiment 1
A preparation method for 3D printed material, the steps include:
(1) the wheat bran particle powder mix of the wheat stalk of 60 mass parts and 40 mass parts is broken into 100-130 object particle, obtains the composite grain after pulverizing;
(2) diatomite and 1 part of calcium carbonate that add 8 mass parts in above-mentioned composite grain are uniformly mixed, be then placed in sealed vessel and heat 25 min, Heating temperature is 150 DEG C, synchronously cools after heating with sealed vessel, obtains the composite grain after pyrolysis; Synchronously cool with sealed vessel after heating, obtain the composite grain after pyrolysis, this pyrolysis is conducive to the stable of material, prevents decomposition too fast;
(3) water of 100 mass parts is taken, the full Semen Maydis powder of 14 mass parts and the gum arabic of 3 mass parts is added in water, heat with sealing cover and the inner container being provided with agitator after stirring into Semen Maydis powder solution, heat while stirring, Semen Maydis powder solution keeps boiling 8 min, then heating is stopped, open sealing cover, add in Semen Maydis powder solution the tripoly phosphate sodium STPP of 5 mass parts, the vinyl acetic monomer of 5 mass parts and 3 mass parts poly(lactic acid) (the present embodiment use poly(lactic acid) be Powdered, order number is lower than 150 orders), cool while stirring; Obtain solution A; The viscosity of solution A increases greatly, is conducive to the solidification in later stage; Wherein the adding of gum arabic, the mobility of whole material can be regulated, make it more be applicable to 3D and print requirement to material property;
(4) composite grain after the pyrolysis obtained in step (2) is joined in the solution A obtained in step (3), stir 5-10 min, obtain the material printed for 3D.
During use, select foregoing 3D printed material, then installed to by 3D printed material in the print cartridge of 3D printer, start before printer, the breeding cup required for printer starts after being heated to 90 DEG C to 3D printed material to print and building build formwork.
The thickness of this breeding cup printed is 0.3 mm, during for tobacco leaf breeding, within 30 days, be transplanted to from nursery pond in large field, loose soil or rupture event is there is not in transplanting process, after being transplanted to large field 10 days, although find that the boundary of seedling-raising cup and soil also exists, a lot of right radical of tobacco leaf penetrates seedling-raising cup, seedling-raising cup also occurs that empty type rots, and the aspect ratio of seedling adopts the tobacco leaf of plastic seeding culturing cup high by 23%; After being transplanted to large field 20 days, seedling-raising cup is no longer as a whole, and the big area Sum decomposition that rots fragmentates shape; After tobacco leaf is received, almost can not find the vestige of seedling-raising cup in soil, illustrate that seedling-raising cup is decomposed completely, the soft degree of the soil at tobacco leaf root system place is apparently higher than peripheral region simultaneously.
When this breeding cup is used for watermelon breeding, 25 days from nursery pond by watermelon transplantation of seedlings in large field, loose soil or rupture event is there is not in transplanting process, after being transplanted to large field 15 days, although find that the boundary in seedling-raising cup and field also exists, but the total length that the main root of watermelon and young root penetrate seedling-raising cup is 38cm, illustrate that the root system of watermelon is easy to penetrate seedling-raising cup, this seedling-raising cup is applicable to watermelon breeding, seedling-raising cup also occurs that hole type is rotted, and the aspect ratio of seedling adopts the watermelon seedling long 18% of plastic seeding culturing cup; After being transplanted to large field 20 days, seedling-raising cup is no longer as a whole, and the big area Sum decomposition that rots fragmentates shape; After tobacco leaf is received, in soil, almost can not find the vestige of seedling-raising cup, illustrate that seedling-raising cup is decomposed completely.
The building formwork for placing of preparation, thickness is 5mm, and fixing when building for the metope highly for 40cm, builds respond well, there is not the situation of crimp, the clear patterns of building, 7 days form removals, concentrate and be deposited in open air, every spray in a 5 days water, after 50 days, resolve into fertilizer.
embodiment 2
A preparation method for 3D printed material, the steps include:
(1) the wheat bran particle powder mix of the wheat stalk of 40 mass parts and 50 mass parts is broken into 150-200 object particle, obtains the composite grain after pulverizing;
(2) diatomite and 2 parts of calcium carbonate that add 7 mass parts in above-mentioned composite grain are uniformly mixed, be then placed in sealed vessel and heat 20 min, Heating temperature is 180 DEG C, synchronously cools after heating with sealed vessel, obtains the composite grain after pyrolysis; Synchronously cool with sealed vessel after heating, obtain the composite grain after pyrolysis, this pyrolysis is conducive to the stable of material, prevents decomposition too fast;
(3) water of 100 mass parts is taken, the full Semen Maydis powder of 10 mass parts and the gum arabic of 5 mass parts is added in water, heat with sealing cover and the inner container being provided with agitator after stirring into Semen Maydis powder solution, heat while stirring, Semen Maydis powder solution keeps boiling 5 min, then heating is stopped, open sealing cover, add in Semen Maydis powder solution the tripoly phosphate sodium STPP of 8 mass parts, the vinyl acetic monomer of 3 mass parts and 4 mass parts poly(lactic acid) (the present embodiment use poly(lactic acid) be Powdered, order number is lower than 140 orders), cool while stirring; Obtain solution A; The viscosity of solution A increases greatly, is conducive to the solidification in later stage; Wherein the adding of gum arabic, the mobility of whole material can be regulated, make it more be applicable to 3D and print requirement to material property;
(4) composite grain after the pyrolysis obtained in step (2) is joined in the solution A obtained in step (3), stir 10 min, obtain the material printed for 3D.
During use, select foregoing 3D printed material, then installed to by 3D printed material in the print cartridge of 3D printer, start before printer, the breeding cup required for printer starts after being heated to 98 DEG C to 3D printed material to print and building build formwork.
The thickness of this breeding cup printed is 0.25mm, during for tobacco leaf breeding, within 30 days, be transplanted to from nursery pond in large field, loose soil or rupture event is there is not in transplanting process, after being transplanted to large field 10 days, although find that the boundary of seedling-raising cup and soil also exists, a lot of right radical of tobacco leaf penetrates seedling-raising cup, seedling-raising cup also occurs that empty type rots, and the aspect ratio of seedling adopts the tobacco leaf of plastic seeding culturing cup high by 21%; After being transplanted to large field 20 days, seedling-raising cup is no longer as a whole, and the big area Sum decomposition that rots fragmentates shape; After tobacco leaf is received, almost can not find the vestige of seedling-raising cup in soil, illustrate that seedling-raising cup is decomposed completely, the soft degree of the soil at tobacco leaf root system place is apparently higher than peripheral region simultaneously.
When this breeding cup is used for watermelon breeding, 25 days from nursery pond by watermelon transplantation of seedlings in large field, loose soil or rupture event is there is not in transplanting process, after being transplanted to large field 15 days, although find that the boundary in seedling-raising cup and field also exists, but the total length that the main root of watermelon and young root penetrate seedling-raising cup is 34cm, illustrate that the root system of watermelon is easy to penetrate seedling-raising cup, this seedling-raising cup is applicable to watermelon breeding, seedling-raising cup also occurs that hole type is rotted, and the aspect ratio of seedling adopts the watermelon seedling long 16% of plastic seeding culturing cup; After being transplanted to large field 20 days, seedling-raising cup is no longer as a whole, and the big area Sum decomposition that rots fragmentates shape; After tobacco leaf is received, in soil, almost can not find the vestige of seedling-raising cup, illustrate that seedling-raising cup is decomposed completely.
The building formwork for placing of preparation, thickness is 5mm, and fixing when building for the metope highly for 40cm, builds respond well, the situation of crimp does not occur, the clear patterns of building, 7 days form removals, insert in methane-generating pit, resolve into natural pond slag after 30 days.
embodiment 3
A preparation method for 3D printed material, the steps include:
(1) the wheat bran particle powder mix of the wheat stalk of 80 mass parts and 30 mass parts is broken into 100-200 object particle, obtains the composite grain after pulverizing;
(2) diatomite and 0.5 part of calcium carbonate that add 10 mass parts in above-mentioned composite grain are uniformly mixed, be then placed in sealed vessel and heat 30 min, Heating temperature is 130 DEG C, synchronously cools after heating with sealed vessel, obtains the composite grain after pyrolysis; Synchronously cool with sealed vessel after heating, obtain the composite grain after pyrolysis, this pyrolysis is conducive to the stable of material, prevents decomposition too fast;
(3) water of 100 mass parts is taken, the full Semen Maydis powder of 18 mass parts and the gum arabic of 2 mass parts is added in water, heat with sealing cover and the inner container being provided with agitator after stirring into Semen Maydis powder solution, heat while stirring, Semen Maydis powder solution keeps boiling 10 min, then heating is stopped, open sealing cover, add in Semen Maydis powder solution the tripoly phosphate sodium STPP of 3 mass parts, the vinyl acetic monomer of 6 mass parts and 1 mass parts poly(lactic acid) (the present embodiment use poly(lactic acid) be Powdered, order number is lower than 130 orders), cool while stirring; Obtain solution A; The viscosity of solution A increases greatly, is conducive to the solidification in later stage; Wherein the adding of gum arabic, the mobility of whole material can be regulated, make it more be applicable to 3D and print requirement to material property;
(4) composite grain after the pyrolysis obtained in step (2) is joined in the solution A obtained in step (3), stir 5 min, obtain the material printed for 3D.
During use, select foregoing 3D printed material, then installed to by 3D printed material in the print cartridge of 3D printer, start before printer, the breeding cup required for printer starts after being heated to 95 DEG C to 3D printed material to print and building build formwork.
The thickness of this breeding cup printed is 0.3mm, during for tobacco leaf breeding, within 30 days, be transplanted to from nursery pond in large field, loose soil or rupture event is there is not in transplanting process, after being transplanted to large field 10 days, although find that the boundary of seedling-raising cup and soil also exists, a lot of right radical of tobacco leaf penetrates seedling-raising cup, seedling-raising cup also occurs that empty type rots, and the aspect ratio of seedling adopts the tobacco leaf of plastic seeding culturing cup high by 23%; After being transplanted to large field 20 days, seedling-raising cup is no longer as a whole, and the big area Sum decomposition that rots fragmentates shape; After tobacco leaf is received, almost can not find the vestige of seedling-raising cup in soil, illustrate that seedling-raising cup is decomposed completely, the soft degree of the soil at tobacco leaf root system place is apparently higher than peripheral region simultaneously.
When this breeding cup is used for watermelon breeding, 25 days from nursery pond by watermelon transplantation of seedlings in large field, loose soil or rupture event is there is not in transplanting process, after being transplanted to large field 15 days, although find that the boundary in seedling-raising cup and field also exists, but the total length that the main root of watermelon and young root penetrate seedling-raising cup is 31cm, illustrate that the root system of watermelon is easy to penetrate seedling-raising cup, this seedling-raising cup is applicable to watermelon breeding, seedling-raising cup also occurs that hole type is rotted, and the aspect ratio of seedling adopts the watermelon seedling long 13% of plastic seeding culturing cup; After being transplanted to large field 20 days, seedling-raising cup is no longer as a whole, and the big area Sum decomposition that rots fragmentates shape; After tobacco leaf is received, in soil, almost can not find the vestige of seedling-raising cup, illustrate that seedling-raising cup is decomposed completely.
The building formwork for placing of preparation, thickness is 6mm, and fixing when building for the metope highly for 45cm, builds respond well, there is not the situation of crimp, the clear patterns of building, form removal after 10 days, concentrates and is deposited in open air, landfill is to field kind, decompose completely after 40 days, decomposite and farm crop sound field is not had an impact, the fertilizer supply of farm crop herein can also be solved simultaneously.
Claims (8)
1. a preparation method for 3D printed material, the steps include:
(1) the wheat bran particle powder mix of the wheat stalk of 40-80 mass parts and 30-50 mass parts is broken into 100-200 object particle, obtains the composite grain after pulverizing;
(2) diatomite and 0.5-2 part calcium carbonate that add 7-10 mass parts in above-mentioned composite grain are uniformly mixed, then be placed in sealed vessel and heat 20-30 min, Heating temperature is 130-180 DEG C, synchronously cools after heating with sealed vessel, obtains the composite grain after pyrolysis;
(3) water of 100 mass parts is taken, the full Semen Maydis powder of 10-18 mass parts and the gum arabic of 2-5 mass parts is added in water, heat with sealing cover and the inner container being provided with agitator after stirring into Semen Maydis powder solution, heat while stirring, Semen Maydis powder solution keeps boiling 5-10 min, then stops heating, opens sealing cover, in Semen Maydis powder solution, add the poly(lactic acid) of the tripoly phosphate sodium STPP of 3-8 mass parts, the vinyl acetic monomer of 3-6 mass parts and 1-4 mass parts, cool while stirring; Obtain solution A;
(4) composite grain after the pyrolysis obtained in step (2) is joined in the solution A obtained in step (3), stir 5-10 min, obtain the material printed for 3D.
2. the preparation method of a kind of 3D printed material according to claim 1, is characterized in that, the quality group of described each material becomes: wheat stalk particle: 60 parts; Wheat bran particle 40 parts; Vinyl acetic monomer 5 parts; 8 parts, diatomite; 1 part, calcium carbonate; Poly(lactic acid) 3 parts; Full Semen Maydis powder 14 parts; Gum arabic 3 parts; Tripoly phosphate sodium STPP 5 parts; 100 parts, water.
3. the preparation method of a kind of 3D printed material according to claim 1, is characterized in that, heat 25 min in sealed vessel in described step (2), Heating temperature is 150 DEG C.
4. the 3D printed material that in claim 1-3, any one obtains.
5. the application of 3D printed material in agricultural in claim 4.
6. a using method for 3D printed material, the steps include:
Select the 3D printed material in claim 4, then installed to by 3D printed material in the print cartridge of 3D printer, before starting printer, printer starts the shape required for printing after being heated to 90-98 DEG C to 3D printed material.
7. the using method of a kind of 3D printed material according to claim 6, is characterized in that, the product of printing is that breeding cup or building build formwork.
8. the application of gum arabic in 3D printed material.
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| CN106700590A (en) * | 2016-12-15 | 2017-05-24 | 南宁梦幻三体环保科技有限公司 | Crop straw 3D printing material |
| CN107129699A (en) * | 2017-05-10 | 2017-09-05 | 同济大学 | A kind of green non-poisonous 3D printing consumptive material and preparation method thereof |
| CN107721227A (en) * | 2017-11-27 | 2018-02-23 | 倪修俊 | A kind of PLA wheat straw fiber composite and preparation method thereof |
| CN109769630A (en) * | 2019-01-25 | 2019-05-21 | 福建师范大学福清分校 | A kind of composite interstitial substance of cultivated tomato and preparation method thereof and cultivation method of tomatoes |
| CN109874610A (en) * | 2019-01-25 | 2019-06-14 | 福建师范大学福清分校 | Degradable controlled release plant skeleton and preparation method thereof, plant land for building implantation methods |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106700590A (en) * | 2016-12-15 | 2017-05-24 | 南宁梦幻三体环保科技有限公司 | Crop straw 3D printing material |
| CN107129699A (en) * | 2017-05-10 | 2017-09-05 | 同济大学 | A kind of green non-poisonous 3D printing consumptive material and preparation method thereof |
| CN107129699B (en) * | 2017-05-10 | 2019-05-14 | 同济大学 | A kind of green non-poisonous 3D printing consumptive material and preparation method thereof |
| CN107721227A (en) * | 2017-11-27 | 2018-02-23 | 倪修俊 | A kind of PLA wheat straw fiber composite and preparation method thereof |
| CN109769630A (en) * | 2019-01-25 | 2019-05-21 | 福建师范大学福清分校 | A kind of composite interstitial substance of cultivated tomato and preparation method thereof and cultivation method of tomatoes |
| CN109874610A (en) * | 2019-01-25 | 2019-06-14 | 福建师范大学福清分校 | Degradable controlled release plant skeleton and preparation method thereof, plant land for building implantation methods |
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Application publication date: 20150923 |