CN111748180A - Biodegradable film raw material combination and biodegradable film material - Google Patents
Biodegradable film raw material combination and biodegradable film material Download PDFInfo
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- A01G9/02—Receptacles, e.g. flower-pots or boxes; Glasses for cultivating flowers
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- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
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- C08J2475/06—Polyurethanes from polyesters
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Abstract
The invention belongs to the technical field of biodegradable materials, and particularly relates to a biodegradable film raw material combination and a biodegradable film material. The biodegradable film raw material combination comprises raw materials such as poly (butylene adipate/terephthalate), PPC (polypropylene random copolymer) type polyurethane, plant fibers, inorganic filler and the like, wherein the PPC type polyurethane can obviously improve the compatibility of a filling material, reduce agglomeration and improve the mechanical property of the material and the flexibility of the surface of a film; the film material can keep higher mechanical property in early seedling culture by combining with other components, the mechanical property is reduced by more than 70 percent under the warm and humid condition of soil for about 2 months, the generation of seedling root pit and root roll is avoided, and a better growth effect is achieved; and each component has rich resources, is green and environment-friendly, has degradability and low price, obviously reduces the production cost, reduces the environmental pollution, has strong market competitiveness and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of biodegradable materials. More particularly, relates to a biodegradable film raw material combination and a biodegradable film material.
Background
The container seedling raising is one advanced seedling raising technology, and includes filling various containers with prepared matrix or nutritious soil, raising seedling in greenhouse, etc. to create excellent growth condition and living environment for seedling and realize large scale industrial seedling raising. Moreover, the container seedling culture has the advantages of short seedling culture period, easy control of the specification and quality of the seedlings, high seedling outplanting rate, seed saving, difficult damage of root systems in the seedling lifting and transporting process, water saving, quick afforestation, long and non-seedling revival period in the afforestation season, convenient mechanical planting, low cost, easy operation and the like, and is widely adopted at home and abroad. However, polyethylene films commonly used for container seedling culture in the current market are not degradable, plant root systems cannot penetrate through the polyethylene films, roots are easily rolled up by roots, and the growth and development of seedlings are influenced; and the plastic recovery operation is complicated, most residual soil damages the soil texture structure, and has serious negative effects on the environment, so that the problem of white pollution is increasingly severe.
In order to solve the problem of white pollution, degradable seedling bags are developed in the prior art for container seedling raising, for example, Chinese patent application CN107828124A discloses a non-woven environment-friendly degradable seedling bag which is mainly prepared from polylactic acid short fibers, bamboo fibers, aromatherapy oil, calcium oxide-polybutylece terephthalate, a degradation promoter, nano bentonite, an auxiliary agent and the like, and has the advantages of mosquito prevention, sterilization, high degradation speed, aging resistance, good toughness, low production cost, degradability and the like; chinese patent application CN106496798A discloses a seedling-raising bag which is mainly made of polypropylene, polyethylene, plant fiber, a filling agent and a degradation promoter, has the effects of high seedling-raising survival rate, easy degradation, insect prevention, insect expelling and the like, is easy to obtain and purely natural in raw materials, and is safe and environment-friendly. However, the two degradable seedling raising bags still have high-strength toughness or strength, are still difficult to decompose within a period of time after being buried in soil, and still have the problem that the roots of the plant roots are rolled up by the roots; in addition, the compatibility of various added plant fibers or filling materials with materials such as polylactic acid, polypropylene and the like is poor, so that the bag cannot be subjected to blow molding, and the film is hard and brittle, so that the bag cannot be used as a seedling raising bag.
Therefore, the biodegradable film raw material combination is urgently needed to be provided for preparing the biodegradable film material of the seedling raising bag, the compatibility of the filling components is improved, the filling amount is improved, the production cost is reduced, meanwhile, higher mechanical property can be kept in early seedling raising, the mechanics can be reduced to the state that the root system is torn and broken after soil is buried for a period of time in the later period, and the phenomenon that the root is rolled up by the pit root is avoided.
Disclosure of Invention
The invention aims to solve the technical problem that the existing biodegradable seedling raising bag material is high in toughness or strength and is easy to cause root pit root rolling; the defects and defects of poor compatibility of the filling material, incapability of blow molding and hard and brittle film are overcome, the biodegradable film raw material combination is used for preparing the biodegradable film material of the seedling-raising bag, the compatibility of the filling components is improved, the filling amount is improved, the production cost is reduced, high mechanical property can be kept in early seedling raising, the mechanics can be reduced to the state that roots are torn and broken after soil is buried for a period of time in the later period, and the phenomenon that roots are rolled up by pits is avoided.
The invention aims to provide a biodegradable film raw material combination.
The invention also aims to provide the application of the biodegradable film raw material combination in preparing biodegradable film materials.
The invention also aims to provide a biodegradable film material for the seedling raising bag.
The invention also aims to provide a preparation method of the biodegradable film material for the seedling raising bag.
The invention also aims to provide a seedling raising bag prepared by adopting the biodegradable film material.
The above purpose of the invention is realized by the following technical scheme:
a biodegradable film raw material composition comprises the following raw materials in parts by weight: 100 parts of poly (butylene adipate/terephthalate), 30-50 parts of PPC (polypropylene random copolymer) polyurethane, 50-100 parts of plant fiber and 50-100 parts of inorganic filler.
Preferably, the feed comprises the following raw materials in parts by weight: 100 parts of poly (butylene adipate/terephthalate), 30-45 parts of PPC (polypropylene random copolymer) polyurethane, 50-70 parts of plant fiber and 50-70 parts of inorganic filler.
The application of the raw material combination provided by the invention in the preparation of biodegradable film materials is within the protection scope of the invention.
Meanwhile, the invention also provides a biodegradable film material for the seedling raising bag, which comprises the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 5-15 parts of polylactic acid, 30-50 parts of PPC polyurethane, 50-100 parts of plant fiber, 50-100 parts of inorganic filler, 5-10 parts of plasticizer and 1-3 parts of coupling agent.
Preferably, the feed comprises the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 5-10 parts of polylactic acid, 30-45 parts of PPC polyurethane, 50-70 parts of plant fiber, 50-70 parts of inorganic filler, 5-8 parts of plasticizer and 1-3 parts of coupling agent.
The poly (butylene adipate)/terephthalate) has good flexibility and similar mechanical properties with polyethylene films when used as films, but the poly (butylene adipate)/terephthalate has the problems of higher cost and higher melt strength, which causes difficult processing, and a modified material is required to be added to reduce the cost and improve the processing performance. The polylactic acid has good plasticity, can reduce the melt strength of the material and improve the processing and forming performance of the material. Plant fiber powder such as wood powder and bamboo powder and inorganic powder such as talcum powder and calcium carbonate are commonly used as filling materials, but when the filling amount is too high, the plant fiber is easy to agglomerate, the material is difficult to process and the performance is reduced, and the plant fiber is used as a natural polymer material, the molecular chain contains a large amount of hydrogen bonds, the plant fiber cannot be melted at high temperature, and the plant fiber can only be distributed in a polymer matrix in a powder form. Coupling agents are additives that improve the compatibility of the inorganic filler with the polymer matrix, but too large an amount increases cost and tends to cause crosslinking that degrades material performance.
The inventor finds that the PPC type polyurethane is a biodegradable thermoplastic elastomer, has excellent mechanical properties, processing properties and the like, has good compatibility with polyester biodegradable materials, can improve the flexibility and compatibility of other materials such as filling materials and the like, can further improve the filler content of film materials, particularly the plant fiber powder content, can obviously improve the dispersion of organic/inorganic powder (plant fiber powder and inorganic filler) in a polymer matrix, and reduces agglomeration. The principle of the PPC type polyurethane composite material is that a large number of urethane bonds and terminal hydroxyl groups on a PPC type polyurethane molecular chain segment can interact with a large number of hydroxyl groups on organic/inorganic filling powder; on the other hand, the PPC type polyurethane is a shear-sensitive type macromolecule, is sheared and thinned under the strong shearing action of a continuous internal mixer, is fully contacted with organic/inorganic filling powder with rough surface, fully wraps and winds the powder, can reduce the agglomeration effect between the filling powder and improve the dispersion performance of the filling powder in a matrix, thereby achieving the effects of reducing the agglomeration of the filling material and improving the compatibility and the addition amount of the filling material. The film is combined with other materials to act together, the mechanical property of the film and the flexibility of the surface of the film are further improved, better tensile strength and elongation can be kept after the film is stored for 2 months, the original film state can be kept after the film is contacted and buried with soil for 2 months, the mechanical property of the material of the film is obviously reduced, and the root system of the seedling can easily tear the film and grow normally.
Further, the PPC type polyurethane is a thermoplastic elastomer of polypropylene carbonate glycol and diisocyanate, and the molar ratio of the polypropylene carbonate glycol to the diisocyanate is 1: (1.0-1.1).
Preferably, the number average molecular weight of the polypropylene carbonate dihydric alcohol is 1000-5000 Da.
Furthermore, the plant fiber is powder with the granularity of 100-600 meshes. The preferred particle size is 100 mesh, 200 mesh, 300 mesh, 400 mesh.
Further, the plant fiber is selected from one or more of bagasse powder, wood powder, bamboo powder, straw powder, grass fiber and microcrystalline cellulose.
Still further, the inorganic filler is selected from one or more of talcum powder, calcium carbonate, montmorillonite and white carbon black.
Preferably, the particle size of the inorganic filler is below 1000 mesh. More preferably, the inorganic filler is 2000 mesh talc or calcium carbonate.
Further, the plasticizer is polyethylene glycol with the number average molecular weight of 600-5000 Da. The preferred number average molecular weights are 1000Da, 2000Da, 3000 Da.
Still further, the coupling agent is a silane coupling agent.
Further, the melt index of the polybutylene adipate/terephthalate is less than 8.0g/10 min. The testing conditions of the molten finger are 190 ℃ and 2.16 kg.
Preferably, the poly (butylene adipate/terephthalate) types include C1200, a400, TH 801T.
Further, the polylactic acid is a blown film grade or injection molding grade polylactic acid.
Preferably, the polylactic acid model number comprises 4032D, 4043D, L175 and LX 175.
In addition, the invention also provides a preparation method of the biodegradable film material, which comprises the following steps:
continuously banburying and granulating the raw materials at 170-190 ℃, and blow molding at 150-180 ℃ with a blow-up ratio of 1.5-3.0 to obtain the film.
The raw materials are mixed by a continuous internal mixer, the uniform dispersion of the filler in the polymer in the blending process is promoted under the action of continuous high shear and high temperature, the high-content filling is achieved, the mixing time of the continuous internal mixer is shorter than that of a double-screw extruder, and the thermal decomposition of the biodegradable material in the processing process is reduced.
The mixed granules obtained by the invention are suitable for blow molding, including single-layer blow molding and multilayer coextrusion blow molding, and are also suitable for preparing sheets, pipes and other extrusion molding processes.
In addition, the invention also provides a seedling raising bag which is prepared by adopting the biodegradable film material.
The invention has the following beneficial effects:
the invention relates to a biodegradable film raw material combination, which comprises raw materials such as poly (butylene adipate/terephthalate), PPC (polypropylene random copolymer) type polyurethane, plant fiber, inorganic filler and the like, wherein the PPC type polyurethane can obviously improve the compatibility of a filling material, reduce agglomeration and improve the mechanical property of the material and the flexibility of the surface of a film; the film material can keep higher mechanical property in early seedling culture by combining with other components, can be gradually degraded under the warm and humid condition of soil, and the mechanical property is reduced by more than 70 percent in about 2 months; and each component has rich resources, is green and environment-friendly, has degradability and low price, obviously reduces the production cost, reduces the environmental pollution, has strong market competitiveness and has wide application prospect.
Detailed Description
The present invention is further illustrated by the following specific examples, which are not intended to limit the invention in any way. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Wherein, the molar ratio of the polypropylene carbonate glycol to the diisocyanate used in the examples is 1: (1.0-1.1), the number average molecular weight of the polypropylene carbonate diol is 1000-5000 Da, the poly (butylene adipate/terephthalate) C1200 is purchased from BASF corporation, the poly (adipate/terephthalate) A400 is purchased from Jinfen science and technology corporation, and the poly (butylene adipate/terephthalate) TH801T is purchased from Xinjiang blue mountain Tunghe chemical corporation; polylactic acids 4032D, 4043D are available from Natureworks, USA, and polylactic acids L175, LX175 are available from Kebi En (Shanghai) Inc.
The remaining reagents and materials used in the following examples are all commercially available unless otherwise specified.
Example 1A biodegradable film Material for use in bag for raising seedlings
The biodegradable film material for the seedling raising bag is prepared from the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 5 parts of polylactic acid, 30 parts of PPC (polypropylene random copolymer) polyurethane, 50 parts of plant fiber, 50 parts of inorganic filler, 5 parts of plasticizer and 1 part of coupling agent;
the type of the poly (butylene adipate/terephthalate) is C1200, the type of the polylactic acid is 4043D, the plant fiber is 200-mesh bagasse powder, the inorganic filler is 2000-mesh talcum powder, the plasticizer is polyethylene glycol with the number average molecular weight of 5000Da, and the coupling agent is a silane coupling agent KH-570.
The preparation method comprises the following steps:
manually mixing the raw materials, putting the mixture into a continuous internal mixer, setting the maximum temperature to be 180 ℃, continuously mixing and granulating, and blow-molding to form a film at the temperature of 175 ℃, wherein the blow-up ratio is 2.8 +/-0.2, and the thickness of the film is controlled to be about 40 mu m, thus obtaining the film.
Example 2 biodegradable film Material for bag for raising seedlings
The biodegradable film material for the seedling raising bag is prepared from the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 10 parts of polylactic acid, 40 parts of PPC (polypropylene random copolymer) polyurethane, 50 parts of plant fiber, 100 parts of inorganic filler, 8 parts of plasticizer and 3 parts of coupling agent;
the type of the poly (butylene adipate/terephthalate) is A400, the type of the polylactic acid is 4032D, the plant fiber is 400-mesh bamboo powder, the inorganic filler is 2000-mesh talcum powder, the plasticizer is polyethylene glycol with the number average molecular weight of 5000Da, and the coupling agent is a silane coupling agent KH-570.
The preparation method comprises the following steps:
manually mixing the raw materials, putting the mixture into a continuous internal mixer, setting the maximum temperature to be 190 ℃, continuously mixing and granulating, and blow-molding to form a film at the temperature of 180 ℃, wherein the blow-up ratio is 2.5 +/-0.2, and the thickness of the film is controlled to be about 40 mu m, thus obtaining the film.
Example 3 biodegradable film Material for bag for raising seedlings
The biodegradable film material for the seedling raising bag is prepared from the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 10 parts of polylactic acid, 50 parts of PPC (polypropylene random copolymer) polyurethane, 100 parts of plant fiber, 50 parts of inorganic filler, 10 parts of plasticizer and 2 parts of coupling agent;
the type of the poly (butylene adipate/terephthalate) is C1200, the type of the polylactic acid is 4043D, the plant fiber is 400-mesh bamboo powder, the inorganic filler is 2000-mesh talcum powder, the plasticizer is polyethylene glycol with the number average molecular weight of 2000Da, and the coupling agent is a silane coupling agent KH-570.
The preparation method comprises the following steps:
manually mixing the raw materials, putting the mixture into a continuous internal mixer, setting the maximum temperature to be 175 ℃, continuously carrying out internal mixing granulation, carrying out blow molding at the temperature of 175 ℃ to form a film, wherein the blow-up ratio is 1.8 +/-0.2, and the thickness of the film is controlled to be about 40 mu m, thus obtaining the film.
Example 4 biodegradable film Material for bag for raising seedlings
The biodegradable film material for the seedling raising bag is prepared from the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 15 parts of polylactic acid, 50 parts of PPC (polypropylene random copolymer) polyurethane, 80 parts of plant fiber, 80 parts of inorganic filler, 10 parts of plasticizer and 3 parts of coupling agent;
the polyethylene glycol adipate/terephthalate is TH801T in model number, the polylactic acid is LX175 in model number, the plant fiber is 600-mesh bamboo powder, the inorganic filler is 3000-mesh calcium carbonate, the plasticizer is polyethylene glycol with the number average molecular weight of 3000Da, and the coupling agent is a silane coupling agent KH-570.
The preparation method comprises the following steps:
manually mixing the raw materials, putting the mixture into a continuous internal mixer, setting the maximum temperature to be 180 ℃, continuously mixing and granulating, and blow-molding to form a film at the temperature of 175 ℃, wherein the blow-up ratio is 2.2 +/-0.2, and the thickness of the film is controlled to be about 40 mu m, thus obtaining the film.
Example 5 biodegradable film Material for bag for raising seedlings
The biodegradable film material for the seedling raising bag is prepared from the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 10 parts of polylactic acid, 30 parts of PPC (polypropylene random copolymer) polyurethane, 80 parts of plant fiber, 50 parts of inorganic filler, 7 parts of plasticizer and 2 parts of coupling agent;
the polyethylene glycol adipate/terephthalate is C1200, the polylactic acid is LX175, the plant fiber is wood powder of 400 meshes, the inorganic filler is talcum powder of 2000 meshes, the plasticizer is polyethylene glycol with the number average molecular weight of 3000Da, and the coupling agent is a silane coupling agent KH-570.
The preparation method comprises the following steps:
manually mixing the raw materials, putting the mixture into a continuous internal mixer, setting the maximum temperature to be 180 ℃, continuously mixing and granulating, and blow-molding to form a film at the temperature of 175 ℃, wherein the blow-up ratio is 2.0 +/-0.2, and the thickness of the film is controlled to be about 40 mu m, thus obtaining the film.
Example 6 biodegradable film Material for bag for raising seedlings
The biodegradable film material for the seedling raising bag is prepared from the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 15 parts of polylactic acid, 40 parts of PPC (polypropylene random copolymer) polyurethane, 50 parts of plant fiber, 80 parts of inorganic filler, 8 parts of plasticizer and 2 parts of coupling agent;
the type of the poly (butylene adipate/terephthalate) is C1200, the type of the polylactic acid is 4043D, the plant fiber is 400-mesh bamboo powder, the inorganic filler is 2000-mesh talcum powder, the plasticizer is polyethylene glycol with the number average molecular weight of 3000Da, and the coupling agent is a silane coupling agent KH-570.
The preparation method comprises the following steps:
manually mixing the raw materials, putting the mixture into a continuous internal mixer, setting the maximum temperature to be 180 ℃, continuously mixing and granulating, and blow-molding to form a film at the temperature of 180 ℃, wherein the blow-up ratio is 2.0 +/-0.2, and the thickness of the film is controlled to be about 40 mu m, thus obtaining the film.
Example 7 biodegradable film Material for bag for raising seedlings
The biodegradable film material for the seedling raising bag is prepared from the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 5 parts of polylactic acid, 50 parts of PPC (polypropylene random copolymer) polyurethane, 100 parts of plant fiber, 50 parts of inorganic filler, 10 parts of plasticizer and 3 parts of coupling agent;
the type of the poly (butylene adipate/terephthalate) is C1200, the type of the polylactic acid is 4043D, the plant fiber is 400-mesh bamboo powder, the inorganic filler is 2000-mesh talcum powder, the plasticizer is polyethylene glycol with the number average molecular weight of 3000Da, and the coupling agent is a silane coupling agent KH-570.
The preparation method comprises the following steps:
manually mixing the raw materials, putting the mixture into a continuous internal mixer, setting the maximum temperature to be 175 ℃, continuously carrying out internal mixing granulation, carrying out blow molding at the temperature of 175 ℃ to form a film, wherein the blow-up ratio is 1.8 +/-0.2, and the thickness of the film is controlled to be about 40 mu m, thus obtaining the film.
Comparative example 1A film Material
The biodegradable film material for the seedling raising bag is prepared from the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 5 parts of polylactic acid, 50 parts of plant fiber, 50 parts of inorganic filler, 5 parts of plasticizer and 1 part of coupling agent;
the type of the poly (butylene adipate/terephthalate) is C1200, the type of the polylactic acid is 4043D, the plant fiber is 200-mesh bagasse powder, the inorganic filler is 2000-mesh talcum powder, the plasticizer is polyethylene glycol with the number average molecular weight of 5000Da, and the coupling agent is a silane coupling agent KH-570.
The preparation method comprises the following steps:
manually mixing the raw materials, putting the mixture into a continuous internal mixer, setting the maximum temperature to be 180 ℃, continuously mixing and granulating, and blow-molding to form a film at the temperature of 175 ℃, wherein the blow-up ratio is 2.8 +/-0.2, and the thickness of the film is controlled to be about 40 mu m, thus obtaining the film.
Comparative example 2A film Material
The biodegradable film material for the seedling raising bag is prepared from the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 10 parts of polylactic acid, 40 parts of PPC (polypropylene random copolymer) polyurethane, 50 parts of plant fiber, 150 parts of inorganic filler, 8 parts of plasticizer and 3 parts of coupling agent;
the type of the poly (butylene adipate/terephthalate) is A400, the type of the polylactic acid is 4032D, the plant fiber is 400-mesh bamboo powder, the inorganic filler is 2000-mesh talcum powder, the plasticizer is polyethylene glycol with the number average molecular weight of 5000Da, and the coupling agent is a silane coupling agent KH-570.
The preparation method comprises the following steps:
manually mixing the raw materials, putting the mixture into a continuous internal mixer, setting the maximum temperature to be 190 ℃, continuously mixing and granulating, and blow-molding to form a film at the temperature of 180 ℃, wherein the blow-up ratio is 2.5 +/-0.2, and the thickness of the film is controlled to be about 40 mu m, thus obtaining the film.
Comparative example 3A film Material
The biodegradable film material for the seedling raising bag is prepared from the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 10 parts of polylactic acid, 40 parts of maleic anhydride grafted polypropylene carbonate (PPC-MA), 50 parts of plant fiber, 100 parts of inorganic filler, 8 parts of plasticizer and 3 parts of coupling agent;
the polyethylene glycol adipate/terephthalate is A400, the polylactic acid is 4032D, the maleic anhydride grafted polypropylene carbonate (PPC-MA) is a melt blend of polypropylene carbonate (PolyskullcAN _ SN. in Henan, the number average molecular weight is 70000Da) and 1% by weight of maleic anhydride, the plant fiber is 400-mesh bamboo powder, the inorganic filler is 2000-mesh talcum powder, the plasticizer is polyethylene glycol with the number average molecular weight of 5000Da, and the coupling agent is a silane coupling agent KH-570.
The preparation method comprises the following steps:
manually mixing the raw materials, putting the mixture into a continuous internal mixer, setting the maximum temperature to be 190 ℃, continuously mixing and granulating, and blow-molding to form a film at the temperature of 180 ℃, wherein the blow-up ratio is 2.5 +/-0.2, and the thickness of the film is controlled to be about 40 mu m, thus obtaining the film.
Comparative example 4A film Material
The biodegradable film material for the seedling raising bag is prepared from the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 10 parts of polylactic acid, 40 parts of maleic anhydride grafted poly (butylene adipate/terephthalate) (PBAT-MA), 50 parts of plant fiber, 100 parts of inorganic filler, 8 parts of plasticizer and 3 parts of coupling agent;
the polyethylene adipate/butylene terephthalate is A400, the polylactic acid is 4032D, the maleic anhydride grafted polybutylene adipate/butylene terephthalate (PBAT-MA) is a melt blend of the polybutylene adipate/butylene terephthalate (BASF C1200) and 1 wt% of maleic anhydride, the plant fiber is 400-mesh bamboo powder, the inorganic filler is 2000-mesh talcum powder, the plasticizer is polyethylene glycol with the number average molecular weight of 5000Da, and the coupling agent is a silane coupling agent KH-570.
The preparation method comprises the following steps:
manually mixing the raw materials, putting the mixture into a continuous internal mixer, setting the maximum temperature to be 190 ℃, continuously mixing and granulating, and blow-molding to form a film at the temperature of 180 ℃, wherein the blow-up ratio is 2.5 +/-0.2, and the thickness of the film is controlled to be about 40 mu m, thus obtaining the film.
TABLE 1 EXAMPLES 1 TO 7 AND COMPARATIVE EXAMPLES 1 TO 4 RAW MATERIALS AND THE CONDITIONS OF THE SAME
Experimental example 1 mechanical properties of film Material and Effect after burying soil
The mechanical properties such as tensile strength and elongation of the film materials of examples 1 to 7 and comparative examples 1 to 4 were measured, and the mechanical properties were measured after the film materials were buried in soil or stored in a warehouse for 2 months, respectively, and the results are shown in table 2.
TABLE 2 mechanical Properties of film materials and Strength Effect after burying soil
Note: the "/" symbol in table 2 indicates that the material could not be shaped or tested under this process.
As can be seen from table 2, the films with certain mechanical strength can be prepared in the embodiments 1 to 7 of the present invention, and after 2 months of soil contact and landfill, the original film state can still be maintained, but the mechanical properties of the materials of the films are significantly reduced, the roots of the seedlings can easily tear the films and grow normally, and the tensile strength and the elongation of the seedlings do not change significantly after 2 months of storage; compared with the comparative example 1, the polyurethane without PPC can not be blow molded at all, and compared with the comparative example 2, the inorganic filling material is too high, so that the film is hard and brittle, the performances are poor, and the film can not be normally used after being broken within one week after being buried in soil; comparative examples 3 and 4, in which other materials were used instead of the PPC type polyurethane, the film properties were degraded and the morphology could not be stably maintained in use.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A biodegradable film raw material combination is characterized by comprising the following raw materials in parts by weight: 100 parts of poly (butylene adipate/terephthalate), 30-50 parts of PPC (polypropylene random copolymer) polyurethane, 50-100 parts of plant fiber and 50-100 parts of inorganic filler.
2. The biodegradable film raw material composition as set forth in claim 1, which comprises the following raw materials in parts by weight: 100 parts of poly (butylene adipate/terephthalate), 30-45 parts of PPC (polypropylene random copolymer) polyurethane, 50-70 parts of plant fiber and 50-70 parts of inorganic filler.
3. The biodegradable film stock combination according to claim 1 or 2, wherein said PPC type polyurethane is a thermoplastic elastomer of polypropylene carbonate diol and diisocyanate, and the molar ratio of said polypropylene carbonate diol to diisocyanate is 1: (1.0-1.1).
4. The biodegradable film raw material combination according to claim 3, wherein the number average molecular weight of the polypropylene carbonate diol is 1000-5000 Da.
5. The biodegradable film stock combination of claim 1 or 2, wherein the plant fiber is selected from one or more of bagasse powder, wood powder, bamboo powder, straw powder, grass fiber, and microcrystalline cellulose.
6. The biodegradable film stock composition according to claim 1 or 2, wherein said inorganic filler is selected from one or more of talc, calcium carbonate, montmorillonite, and silica.
7. Use of the biodegradable film raw material composition according to any one of claims 1 to 6 in the preparation of biodegradable film materials.
8. A biodegradable film material for a seedling raising bag is characterized by comprising the following raw materials in parts by weight:
100 parts of poly (butylene adipate/terephthalate), 5-15 parts of polylactic acid, 30-50 parts of PPC polyurethane, 50-100 parts of plant fiber, 50-100 parts of inorganic filler, 5-10 parts of plasticizer and 1-3 parts of coupling agent.
9. The method for preparing the biodegradable film material according to claim 8, comprising the steps of:
continuously banburying and granulating the raw materials at 170-190 ℃, and blow molding at 150-180 ℃ with a blow-up ratio of 1.5-3.0 to obtain the film.
10. A seedling raising bag, characterized by being made of the biodegradable film material according to claim 8.
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| CN115850939A (en) * | 2022-11-30 | 2023-03-28 | 吉林省农业科学院 | Low-cost biodegradable mulching film and preparation method thereof |
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