245 results about "Polybutylene succinate" patented technology

A biodegradable polymer composite, a method of making the same and use for same are provided. The biodegradable polymer composite has about 30 to 99.5% by weight of a polymer selected from a group consisting of polybutylene adipate terephthalate (PBAT), polybutylene succinate (PBS), polyhydroxyalkanoates (PHA), and polycaprolactone (PCL) grafted with a compatibilizer selected from a group consisting of maleic anhydride, glycidyl methacrylate, pyromellitic anhydride, acrylic acid, polyacrylic acid, methylene diphenyl diisocyanate, poly(glycidyl methacrylate, copolymer(s) of glycidyl methacrylate; and about 0.5 to 50 % by weight a nano-filler or a micro-filler. The biodegradable polymer composite does not contain polylactic acid. Surfaces of the nano-filler or the micro-filler may be modified using a grafting agent so that the biodegradable polymer composite has enhanced mechanical properties, increased heat resistance, compostablity and / or improved processability. The biodegradable polymer composite may be used to make flexible articles, such as a freezer wrap and a farming sheet.

The invention discloses a degradable bamboo fiber express packaging bag and a preparation method thereof, and belongs to the technical field of express packaging. The packaging bag is prepared from, by mass, 32-42 parts of pretreated bamboo fibers, 22-28 parts of poly (butylene succinate), 9-14 parts of modified nano calcium carbonate, 12-16 parts of polycaprolactone, 6-11 parts of acetylated chitosan and the like, and the key raw materials are all treated through an exclusive pretreatment or modification process. The preparation method comprises the steps of raw material plasma activation, segmented high-speed mixing, vacuum drying, precise-parameter twin-screw extrusion granulation, secondary drying, precise film blowing, high-precision heat-sealing bag making and the like, and the technological parameters of all the steps are clear. The product disclosed by the invention can be efficiently degraded in a natural environment, has excellent tensile resistance, puncture resistance and impact resistance, is stable and controllable in processing process, and is adaptive to actual requirements of express packaging and industrial batch production.

The invention discloses an anti-shrinkage light, soft and elastic sole foaming material and a preparation method thereof, and belongs to the technical field of footwear products. The light, soft and elastic sole foaming material is formed by chemically foaming an EVA (Ethylene Vinyl Acetate) composite raw material, the EVA composite raw material is prepared from 50 to 70 parts of EVA, 20 to 40 parts of olefin thermoplastic elastomer, 10 to 20 parts of styrene elastomer, 1.5 to 3 parts of maleic anhydride grafted ethylene-octylene copolymer compatilizer, 0.4 to 0.8 part of peroxide cross-linking agent, 3 to 4 parts of foaming agent, 1 to 1.5 parts of zinc oxide, 1 to 1.5 parts of polyethylene wax substance and 0.5 to 1.5 parts of poly (butylene succinate). 0.3 to 1 part of polyamide 12 microspheres and 2 to 3 parts of nano montmorillonite. The foaming material can resist shrinkage when being used as a shoe sole part, and has good rebound performance and the like, so that the high-quality requirement of sneakers, the mass production stability and the like are met.

The invention discloses a high-barrier antibacterial packaging material, a preparation method thereof and a packaging bag, and belongs to the technical field of packaging, the packaging material comprises the following raw materials by weight: 75-85 parts of polylactic acid, 15-25 parts of poly (butylene succinate), 2-6 parts of epoxidized urushiol, and 1-3 parts of benzyl quaternary ammonium salt modified montmorillonite; the epoxidized urushiol is prepared by carrying out epoxidation reaction on urushiol and organic peroxy acid; the packaging material further comprises the following raw materials: 2-5 parts of sepiolite fiber loaded magnesium oxide; according to the invention, biodegradable polylactic acid and poly (butylene succinate) are taken as base materials, and epoxidized urushiol is taken as a reactive compatilizer, so that the compatibility between polylactic acid and poly (butylene succinate) is improved, and meanwhile, the binding property between a polymer matrix and benzyl quaternary ammonium salt modified montmorillonite and sepiolite loaded magnesium oxide is enhanced; the packaging material with good mechanical property, barrier property and antibacterial property is obtained.

The invention discloses a preparation method of an environment-friendly degradable single-sided perspective sticker, and belongs to the technical field of modified nano materials. The method comprises the following steps: (1) preparation of a multi-layer composite structure: mixing polylactic acid and poly (butylene succinate), adding nano-montmorillonite and a surface modifier, and carrying out melt blending to form a first-layer melt; stirring poly (butylene adipate-co-terephthalate) and fluorescent carbon nanodots to form a second layer of melt; the first layer, the pressure-sensitive adhesive layer and the second layer are co-extruded and compounded to form a film blank. And (2) construction of the nano-film: biaxially stretching the film blank, imprinting a micropore array, dipping in the silver nanoparticle suspension, and drying to obtain the nano-film. And (3) coating functionalization treatment: immersing into a fluorine-containing nano coating solution, and curing. And (4) post-treatment: carrying out secondary curing. The obtained single-sided perspective sticker is suitable for the fields of buildings, vehicle privacy films and the like, and solves the problems of serious pollution and slow degradation of a traditional sticker.

The invention discloses a poly (butylene succinate) composite fiber and a preparation method thereof. The preparation method comprises the following steps: 1) dissolving the photochromic dye, the antioxidant A and the ultraviolet light absorber in an oil-soluble solvent to obtain an oil-phase solution; 2) adding the oil phase solution into an aqueous solution containing an emulsifier, and emulsifying to obtain an oil-in-water emulsion; adjusting the pH value of the emulsion to 3-8 and the temperature to 20-100 DEG C; (3) adding a capsule wall material and a magnetic substance into water, adding the mixture into the emulsion at a constant speed, putting the mixture into an external magnetic field with controllable strength, and keeping the temperature at 20-90 DEG C for 0.3-5 hours to obtain the photochromic microcapsule with a shell with a special structure; and 4) adding the photochromic microcapsule into a spinning solution of the poly (butylene succinate) fiber, and then spinning to obtain the poly (butylene succinate) composite fiber.

The invention relates to the technical field of plugging materials, and provides a low-temperature temporary plugging agent for fracturing and a preparation method thereof. The low-temperature temporary plugging agent for fracturing is prepared from the following raw material components: polycaprolactone, polylactic acid, polyglycolic acid, poly (butylene succinate), triglycidyl isocyanurate and silicon dioxide. The silicon dioxide comprises silicon dioxide A and silicon dioxide B; the silicon dioxide A is nano silicon dioxide; the silicon dioxide B is nano silicon dioxide composite micron silicon dioxide. Through the technical scheme, the problem of low strength of the low-temperature temporary plugging agent in related technologies is solved.

The invention relates to the technical field of high polymer materials, and discloses a preparation method of a modified master batch degradable material and application of the modified master batch degradable material in a packaging lunch box, and the modified master batch degradable material comprises the following components by mass: 75.0-93.8 parts of poly (butylene succinate); 5.0 to 20.0 parts of aliphatic series-aromatic copolyester; 1.0 to 4.0 parts of 1, 1 '-methylenebis-4, 1-phenylene-bismaleimide, and 1.0 to 4.0 parts of 1, 1'-methylenebis-4, 1-phenylene-bismaleimide; 0.5 to 2.0 parts of talcum powder; the method comprises the following steps: mixing dried poly (butylene succinate), aliphatic-aromatic copolyester, bismaleimide and talcum powder, performing reactive extrusion and melt mixing through a twin-screw extruder, and then cooling, pelletizing and drying the extrudate. Through specific components and a reactive extrusion process, a dynamic cross-linked network is formed by utilizing a Diels-Alder reaction, and the modified master batch degradable material of which the comprehensive mechanical property and the heat resistance are remarkably improved is prepared.

The invention relates to the technical field of reverse osmosis scale inhibitor preparation, and particularly discloses a concentrated water reverse osmosis scale inhibitor and a preparation method thereof.The scale inhibitor comprises 8-10 parts of pentaerythritol, 10-30 parts of acrylic acid, 10-30 parts of a triallyl borate monomer, 5-10 parts of a zinc acrylate monomer, 3-6 parts of a vinyl sulfonic acid monomer and 10-30 parts of a poly (butylene succinate) prepolymer. According to the reverse osmosis scale inhibitor, pentaerythritol serves as a central core, a good starting site is provided for construction of a dendritic structure, acrylic acid and pentaerythritol are subjected to an esterification reaction, each hydroxyl group reacts with acrylic acid to be connected with an acrylate branched chain, a first-generation dendritic structure is formed, and the first-generation dendritic structure is formed; the preparation method comprises the following steps: firstly preparing a dendritic polymer, then introducing a boron element, a zinc element and a sulfonic acid group through a copolymerization reaction to enhance the scale inhibition effect of the dendritic polymer, and finally performing condensation with a poly (butylene succinate) (PBS) chain segment to improve the biodegradability of the dendritic polymer.

The invention belongs to the technical field of degradable and high-barrier modified plastics, and particularly relates to an environment-friendly, high-oxygen-barrier and water-resistant modified plastic, a plastic alloy and a functional product of the environment-friendly, high-oxygen-barrier and water-resistant modified plastic and the plastic alloy. According to the material, polyvinyl alcohol is used as a main component and is blended with auxiliaries such as a plasticizer and a cross-linking agent through a twin-screw melt extrusion technology, and modified plastic (HB-PVOH) with excellent barrier property, water resistance and mechanical property is formed. In order to further enhance the performance, the HB-PVOH can be co-extruded with polymers such as polyhydroxyalkanoate, polymethyl ethylene carbonate, polylactic acid, poly (butylene succinate) and the like to prepare binary or ternary plastic alloy. The material can be widely applied to the fields of high-end packaging, oxygen barrier coatings, environment-friendly packaging and the like, plastic or paper-plastic composite products are prepared through a multi-layer co-extrusion-film blowing, curtain coating or film spraying technology, the sustainable development trend of aluminum reduction, plastic reduction and fluorine reduction is met, and the material is a green packaging solution which is high in cost performance, environmentally friendly and practical.

The invention relates to the technical field of papermaking, in particular to food waterproof and oilproof paper and a preparation method thereof.The food waterproof and oilproof paper is composed of base paper and a coating layer covering the surface of the base paper; the base paper is prepared from the following raw materials: sisal fibers, polylactic acid fibers, water glass, nano silicon dioxide, starch and polyacrylamide; preparing a coating layer: coating the surface of base paper with the coating liquid, and then drying and calendering to obtain the coating layer; the coating liquid is prepared from the following raw materials: modified fucoidin, poly (butylene succinate), modified nano cellulose, sorbitol, polysilicate aluminum sulfate, polyvinyl alcohol, sodium thiosulfate and water. Through matching and combination of the raw materials, the food waterproof and oil-proof paper has certain antibacterial property and strength while improving waterproof and oil-proof properties, and the food fresh-keeping effect is improved.

The invention belongs to the technical field of preparation of molecular materials and adhesive tapes, and discloses a degradable mylar adhesive tape and a preparation method thereof, the degradable mylar adhesive tape comprises a degradable base material layer and a degradable adhesive layer; the degradable base material layer is prepared from the following raw materials in parts by mass: 25-35 parts of poly (butylene succinate) (PBS), 20-30 parts of polylactic acid (PLA), 10-15 parts of polycaprolactone (PCL), 8-12 parts of modified bamboo fiber powder, 3-5 parts of a compatibilizer and 0.5-1 part of an antioxidant; the degradable adhesive layer is prepared from the following raw materials in parts by mass: 40 to 50 parts of a modified starch-based adhesive, 15 to 25 parts of poly (butylene adipate-co-terephthalate) (PBAT), 10 to 15 parts of polyhydroxyalkanoate (PHA), 5 to 8 parts of sodium alginate-chitosan composite gel, 5 to 8 parts of an epoxypropane modifier, 1 to 2 parts of a cross-linking agent and 0.3 to 0.5 part of a de-foaming agent; by optimizing the raw material composition and the preparation process of the base material and the adhesive, the full-life-cycle degradability of the adhesive tape is realized, and meanwhile, excellent mechanical properties, insulativity and temperature resistance are ensured.

The invention provides an aerogel-based submarine cable material as well as a preparation method and application thereof.The submarine cable material is prepared from the following raw materials in parts by weight: 10-20 parts of modified aerogel, 20-25 parts of high-density polyethylene, 6-10 parts of a styrene-maleic anhydride copolymer, 4-6 parts of 2, 7-anthraquinone ethanesulfonic acid and 5-7 parts of modified poly (butylene succinate), 2 to 4 parts of acetyl triethyl citrate; the modified aerogel is prepared from silane modified aerogel and sulfydryl modified aerogel in a mass ratio of 1: (1-3). By compounding the raw materials, the comprehensive performance of the cable material is comprehensively improved, so that the cable material has excellent light weight, pressure resistance, low temperature resistance, corrosion resistance, flexibility, aging resistance and chemical stability, has good environmental adaptability, prolongs the service life of a cable in an extreme seabed environment, and has good social use value.

The invention belongs to the technical field of pressure-sensitive adhesives, and provides a biodegradable pressure-sensitive adhesive and a preparation method thereof. The biodegradable pressure-sensitive adhesive is prepared from the following raw materials in parts by weight: 50 to 60 parts of polybutylene succinate, 20 to 30 parts of degradable thermoplastic elastomer, 20 to 30 parts of tackifying resin, 6 to 12 parts of plasticizer, 0.5 to 1.5 parts of mildew preventive, 0.5 to 2 parts of antioxidant and 0.3 to 1 part of anti-aging agent, wherein the degradable thermoplastic elastomer is a polycaprolactone-polylactide segmented copolymer, the weight-average relative molecular mass of the degradable thermoplastic elastomer is 50000 to 70000, and the content of a polycaprolactone phase in the polycaprolactone-polylactide segmented copolymer is 65 to 80 percent. The biodegradable pressure-sensitive adhesive not only has excellent adhesive property, but also has excellent biodegradability, and can effectively overcome the defects of weak cohesion, poor adhesive property and poor degradability of the existing hot-melt pressure-sensitive adhesive containing the thermoplastic elastomer.

The invention relates to the technical field of high polymer materials, in particular to a degradable PHA tableware material and a preparation method thereof. The degradable PHA tableware material overcomes the problem that the degradable PHA tableware material is poor in mechanical property and antibacterial property. The preparation method comprises the following steps: drying polyhydroxyalkanoate, poly (butylene succinate), acetylated lignin, nano-zinc oxide, chitosan oligosaccharide and hexagonal boron nitride, carrying out melt extrusion on the dried materials, maleic anhydride grafted PHA, acetyl tributyl citrate and cinnamyl aldehyde in a double-screw extruder, carrying out injection molding, and carrying out plasma treatment activation. Polyurethane antibacterial slurry containing silver-loaded zeolite is sprayed, the tableware material with the body-surface synergistic enhancement function is finally obtained, and the impact strength, rigidity and antibacterial rate of the material are improved.

The invention discloses a full-degradable high-temperature-resistant foaming material which comprises a low-density system, a medium-density system and a high-density system, the low-density system comprises the following components: stereocomplex polylactic acid formed by mixing poly-L-lactic acid and poly-D-lactic acid, poly (butylene succinate), surface radiation modified straw fibers, talcum powder, nano clay and supercritical carbon dioxide; the medium-density system comprises the following components: stereocomplex polylactic acid formed by mixing poly-L-lactic acid and poly-D-lactic acid, poly (butylene succinate), plasticized starch, an AC foaming agent, zinc oxide and citric acid; the high-density system comprises the following components: stereocomplex polylactic acid formed by mixing poly-L-lactic acid and poly-D-lactic acid, polyhydroxybutyrate, surface radiation modified straw fibers, sodium bicarbonate and a DCP dynamic cross-linking agent. The full-degradable high-temperature-resistant foaming material provided by the invention has the advantages of high temperature resistance, good mechanical property, complete degradation and the like.

The present application relates to the technical field of degradable packaging. Particularly disclosed are a degradable food container and a preparation method therefor. The degradable food container comprises a paper food container base body and a degradable coating applied on the paper food container base body, wherein the degradable coating is prepared from the following raw materials in parts by weight: 40-50 parts of polylactic acid; 10-15 parts of polybutylene succinate; 15-20 parts of polyglycolic acid; 10-20 parts of cassava starch; 5-8 parts of an external additive; 1.2-1.8 parts of montmorillonite; 0.2-0.8 parts of boron nitride nanotubes; and 1.5-2.5 parts of modified hemp fibers. The preparation method therefor comprises: heating polylactic acid, polybutylene succinate and polyglycolic acid to a molten state, then adding cassava starch and an external additive thereto, finally adding montmorillonite, boron nitride nanotubes and modified hemp fibers thereto, performing extrusion granulation, melting and then coating same on the surface of the paper food container base body, cooling same, and then cutting and forming same into a container to obtain the degradable food container. The degradable food container of the present application can exhibit excellent temperature change resistance when being subjected to temperature change caused by an external environment.

The invention discloses a marine land full-natural-domain biodegradable plastic and a method for preparing the biodegradable plastic, and relates to the technical field of biodegradable plastics. Polyhydroxyalkanoate, polylactic acid and poly (butylene succinate) are used as main matrixes of the material, modified alginate gel is innovatively introduced, and the biodegradable plastic is prepared. The gel has photo-thermal and ionic characteristics, and under the condition of land illumination, the photo-thermal effect of the quantum dots triggers the gel to shrink and release lipase to accelerate hydrolysis; in a marine environment, sodium ion replacement promotes gel to be disintegrated and continuously releases enzyme molecules, the gel, matrix resin, natural fibers and a plasticizer are subjected to twin-screw melt blending extrusion, and the biodegradable plastic is prepared. The technical problems of response lag, insufficient enzyme activity protection and low degradation efficiency of traditional biodegradable plastics in a complex natural environment are effectively solved, and self-adaptive efficient degradation in sea and land environments is realized.

The invention discloses a paper-plastic composite reactive polyurethane hot melt adhesive for low-temperature coating, and belongs to the technical field of polyurethane adhesives, the paper-plastic composite reactive polyurethane hot melt adhesive for low-temperature coating comprises the following components by weight: 50-70 parts of modified polyester polyol, 30-50 parts of modified polyether polyol, 15-24 parts of diisocyanate, and 5-30 parts of tackifying resin, 0.1-1 part of a catalyst, 5-35 parts of a filler, 0.05-2 parts of a polymerization inhibitor and 0.1-0.5 part of an antioxidant; the modified polyester polyol is modified poly (butylene succinate); the modified polyether polyol is modified polypropylene glycol; the polyurethane hot melt adhesive prepared by modifying 5-norbornene-2-methylamine with a strong polar bond-NH and 3, 7-dimethyl octyl-6-ene-1-alcohol containing an insect-proof and mildew-proof functional component with polyhydric alcohol has relatively low melting temperature and viscosity, has initial viscous force of more than 1N and final viscous force of more than 5N at the same time, and has the characteristics of high temperature resistance, high temperature resistance, high temperature resistance and the like. The method can be well applied to paper-plastic compounding for low-temperature coating.

The invention describes an environmentally friendly hot melt adhesive based on renewable raw materials. The hot melt adhesive formulation consists of bio-based polyesters, specifically a combination of polylactic acid and polybutylene succinate, as well as resins, plasticizers, and stabilizers. Optionally, further additives can be added, such as waxes, fumed silica, lime, or color pigments. The raw materials used are sustainable, biodegradable, and harmless to the environment. The adhesive exhibits very good adhesion to wood, paper, cardboard, and some predominantly non-polar plastics such as PMMA, ABS, PC, PLA, or PET and can be applied using standard equipment.

The present disclosure relates to a biodegradable plastic bag composition and a method for manufacturing a plastic bag using the same, wherein the plastic bag composition includes: cellulose acetate propionate (CAP); and polybutylene succinate (PBS), wherein cellulose acetate propionate:polybutylene succinate, which is the weight ratio of the cellulose acetate propionate and the polybutylene succinate, is approximately 75:25 to approximately 90:10.

The present application relates to degradable extrusion webs, composites and polymer blend compositions thereof, and uses thereof. A degradable extruded web includes a plurality of interconnected strands, at least a portion of the strands being made from a polymer blend comprising a polylactic acid polymer composition, a polybutylene succinate, and a degradation additive comprising a degradation agent in a carrier resin. The present disclosure also relates to turf and methods of making turf using such degradable extrusion webs.

The present invention discloses a compression-resistant deformed modified polylactic acid foaming material and a preparation method thereof. The modified polylactic acid material is prepared from the following raw material components by weight percentage: polylactic acid, reactive monomer, polybutylene succinate, silane coupling agent, filler. The modified polylactic acid foaming material obtained by the present invention has the characteristics of strong compression-resistant deformation ability and good resilience effect after compression, and can be widely applied to packaging cushioning materials, disposable lunch boxes, etc.

Composition comprising from 68% to 75% by weight of at least one rigid (co)polyester selected from the group consisting of polybutylene succinate, polylactide, polyhydroxyalkanoate; from 25 to 35% by weight of at least one flexible (co)polyester selected from the group consisting of polybutyrate, poly(ε-caprolactone) and PBS copolymers; from 0.2 to 5% by weight of at least one hydrophobic additive selected from the group consisting of behenamide, erucamide, stearamide and oleamide; process for preparing a monolayer film from this composition by extrusion blowing; monolayer film obtained and bakery product packaging articles comprising the monolayer film. Figure to be published with the abstract: none

The invention discloses a black mulching film for rice cultivation and a preparation method thereof, and relates to the technical field of agricultural high polymer materials. When the black mulching film for rice cultivation is prepared, 1, 4-butanediol, butanedioic anhydride and itaconic acid are subjected to vacuum polycondensation to prepare a poly (butylene succinate)-itaconic acid block copolymer; performing esterification reaction on starch and octenyl succinic anhydride to obtain modified starch; the preparation method comprises the following steps: pyrolyzing corn straws to prepare biological carbon black, carrying out acid pickling activation, loading abamectin, and carrying out surface modification by using 3-mercaptopropyltrimethoxysilane to prepare surface-modified drug-loaded biological-based carbon black powder; and mixing the poly (butylene succinate)-itaconic acid segmented copolymer, modified starch, the surface modified drug-loaded bio-based carbon black powder and glycerol according to a ratio, performing twin-screw extrusion, promoting a click chemical reaction between double bonds and sulfydryl, performing granulation, and performing blow molding to obtain the black mulching film for rice cultivation. The prepared black mulching film for rice cultivation has biodegradability, excellent mechanical properties and a slow-release insecticidal function.

The application discloses a kind of landscape flowerpot production polyester degradable plastics and preparation method thereof, belong to degradable plastics production technical field, first, landscape flowerpot production polyester degradable plastics includes following mass parts raw materials: polylactic acid 50~70 parts, polybutylene succinate 20~35 parts, modified polyhydroxy fatty acid ester 10~15 parts, rare earth strontium aluminate coated cerium oxide core-shell powder 0.8~1.2 parts, antioxidant 0.3~0.8 parts, lubricant 0.5~1.0 parts.The application is improved by modification PHA (promote interface compatibilization and low temperature toughness) and core-shell powder (enhance anti-ultraviolet and degradation control), combined with PLA / PBS basic system, comprehensively solve the core defects of landscape flowerpot material. Example data confirms that its low-temperature impact strength is increased by more than 50%, yellowing rate is reduced by more than 80%, rigidity remains stable, degradation rate is controllable, has outstanding environmental protection and market value.

This disclosure provides formulations and processes that reduce the injection molding cycle times for poly(hydroxyalkanoate) blends which may contain a succinate polymer such as poly(butylene succinate), a filler such as lignocellulosic biomass and other additives. Blending of PHA with the second polymer may increase biodegradability and compostability.

The invention relates to the technical field of plastics, in particular to a high-strength antibacterial plastic packaging bottle and a preparation method thereof. The invention comprises the following steps: polylactic acid, polybutylene succinate, epoxy soybean oil and composite zinc oxide are mixed, extruded into granules and blow-molded to obtain a base member; tea polyphenols are carried on a carrier of mesoporous nano zinc oxide, which is then coated with carboxymethyl chitosan and grafted with an epoxy compound containing Si-O segments; a protective coating is prepared by using the composite zinc oxide and soybean oil-based self-healing waterborne polyurethane, and the protective coating is coated on the surface of the base member; a polyurethane prepolymer is prepared by using soybean oil-based polyol, polytetramethylene ether glycol and isophorone diisocyanate as raw materials, 2,2-bis(hydroxymethyl)propionic acid is used as a hydrophilic chain extender, the epoxy compound containing Si-O segments is used as a modifier, 1,4-butanediol and dithiodiethanol are used as end-capping agents, triethylamine is used as a neutralizing agent, and ethylenediamine and tetraethylenepentamine are used as amine cross-linking agents to prepare the soybean oil-based self-healing waterborne polyurethane.

The present invention relates to a wad (30) that is at least partially biodegradable for shot or bullet cartridges (10), made of a single piece of plastic. Said wad (30) comprises one or more polymers, including one or more polybutylene succinate polymers, and calcium carbonate. The mass fraction of said polymer(s) in said wad (30) is greater than or equal to 70%, the mass fraction of calcium carbonate in said wad (30) is greater than or equal to 6.5%, and the polybutylene succinate polymer(s) constitutes the majority by mass in said wad (30).

The invention discloses a breathable and environment-friendly fruit and vegetable fresh-keeping bag and a preparation method thereof, and relates to the technical field of packaging bags, and the fruit and vegetable fresh-keeping bag is composed of composite plastic and graphene; the graphene is nano graphene; the average particle size is 100 nm; the fruit and vegetable fresh-keeping bag is prepared from the following components in percentage by weight: 1 to 3 percent of graphene and 97 to 99 percent of composite plastic, the composite plastic is prepared from poly (butylene succinate), polylactic acid and clay. Wherein the clay is nano clay, and the clay comprises small-particle-size clay and large-particle-size clay; the particle size of the small-particle-size clay is 50nm, and the particle size of the large-particle-size clay is 100-200nm; the clay comprises montmorillonite; compared with the prior art, the high-carbon-dioxide-permeability graphene film has the advantages that higher carbon dioxide permeability can be achieved, the effective performance of graphene is protected in a high-humidity environment, long-time effective action is achieved, and deterioration of fruits and vegetables caused by too high carbon dioxide concentration can be prevented for fruits and vegetables with strong respiration.