55 results about "Biodegradable composites" patented technology

The invention discloses an irradiation cross-linked biodegradable composite plastic straw and a preparation method thereof. The irradiation cross-linked biodegradable composite plastic straw is prepared from the following raw materials in percentage by mass: 40-80% of polylactic acid, 15-45% of nano inorganic filler, 0.4-1% of chain extender, 1-3% of flexibilizer, 1-3% of lubricant, 0.3-1% of nucleating agent, 0.3-1% of coupling agent, 1-10% of cross-linking agent and 0.3-1% of compatilizer. The chain extender is an epoxy group chain extender copolymer which contains 6-9 epoxy functional groups and is formed by copolymerizing glycidyl methacrylate, styrene and acrylic acid low-carbon alcohol ester through a solution polymerization or suspension polymerization process. The heat resistance of the polylactic acid composite plastic can be improved through irradiation processing, the polylactic acid composite plastic straw has higher heat resistance and does not deform in a high-temperature use environment, and pathogenic bacteria and viruses in a product are killed in the irradiation crosslinking process at the same time.

The invention relates to a biodegradable composite material comprising a biodegradable polymer matrix and Padauk wood particles dispersed in said polymer matrix.

This invention relates to the technical field of textile packaging products, and in particular to a composite textile packaging bag and a composite process, comprising the following steps: S1, slurry preparation and homogenization: a bio-based polymer, plasticizer, modified nanofiller and solvent are mixed in proportion and placed in a stirring device for mixing and stirring to form a homogeneous functional composite slurry; S2, substrate pretreatment: a biodegradable textile substrate is provided and its surface is activated; S3, slurry coating; S4, gradient curing and composite: the substrate coated with slurry is sequentially passed through a first heating zone, a second heating zone and a third heating zone with gradient temperatures for stepwise drying, cross-linking curing and cooling, so that the functional composite slurry forms a dense barrier layer on the surface of the substrate, thereby obtaining the multifunctional biodegradable composite material; the substrate and slurry components used are biodegradable, improving environmental friendliness.

The invention relates to the technical field of compatilizers, and particularly discloses a P34HB-g-GMA compatilizer as well as a preparation method and application thereof. The P34HB-g-GMA compatilizer is prepared from the following preparation raw materials in percentage by mass: 88%-98% of poly (3-hydroxybutyrate-4-hydroxybutyrate), 0.02%-2% of an initiator, 1%-10% of glycidyl methacrylate, 0.1%-1% of an inhibitor, 0.1%-1% of a lubricant and 0.1%-1% of an auxiliary agent, wherein the sum of the mass percentages of the preparation raw materials is 100%. The P34HB-g-GMA, which is prepared by carrying out addition reaction on GMA serving as a grafting monomer and free radicals on a P34HB molecular chain, has the property of a compatilizer, and can be used for effectively improving the compatibility between PHA and other biological materials and improving the stability and the mechanical property of the composite material when being applied to a biodegradable composite material.

The invention discloses a biodegradable composite material as well as a preparation method and application thereof. The biodegradable composite material is formed by laying and hot-pressing a multi-layer structure, when the multi-layer structure is laid, a hydrophobic fiber layer A, a filling fiber layer A, a PBAT film layer, a filling fiber layer B and a hydrophobic fiber layer B are sequentially arranged from top to bottom; the hydrophobic fiber layer A and the hydrophobic fiber layer B are prepared from 20-40 parts of natural plant fibers in total, and the filling fiber layer A and the filling fiber layer B are prepared from 10-20 parts of cereal crop straw fibers and 2-6 parts of PBAT in total; according to the invention, a lamination heat sealing process is adopted, complex melt blending and granulation processes are avoided, and the production process is simple and low in energy consumption; the main raw materials are from agricultural wastes and biodegradable plastics, are wide in source and low in cost, are particularly suitable for manufacturing seedling culture containers, are not damaged in transportation and stacking processes due to good strength, are convenient to tear during transplanting due to excellent toughness, and can be fused with soil and provide nutrients for seedlings after being degraded.

The present invention provides a tissue-restoring biodegradable composition comprising microspheres that contain poly-L-lactic acid (PLLA) and hydroxyapatite (HAp). In addition, the present invention provides a method for preparing a tissue-restoring biodegradable composition, comprising the steps of: preparing microspheres by mixing poly-L-lactic acid and hydroxyapatite; and adding hyaluronic acid to the microspheres, wherein a collagen tissue regeneration effect is maintained from the initial stage to the final stage after a filler injection.

The present application relates to the technical field of plastic film, in particular to a high-strength biodegradable composite film and a preparation method thereof.The present application overcomes the shortcomings of poor strength and poor barrier property of the existing film.The present application feeds a mixture of polylactic acid, modified montmorillonite, modified polycaprolactone and stearic acid amide into a double-screw extruder;then step-by-step blends the mixture A and 1,4-butanediol diglycidyl ether;finally, the material is extruded, cooled and granulated to obtain a composite material;the composite material is blown into a film to obtain the composite film;wherein the mixture A comprises polybutylene adipate terephthalate, modified mesoporous nanosilica, zinc laurate and 2-phenylimidazoline;the modified polycaprolactone is prepared from the polycaprolactone, maleic anhydride and dicumyl peroxide.The film prepared by the present application has high strength and good barrier property.

This invention discloses a bamboo powder biodegradable composite masterbatch, its preparation method, and a composite film, belonging to the field of biodegradable materials technology. Addressing the problems of limited bamboo powder addition, single function, and poor process adaptability in existing technologies, this invention modifies bamboo powder through "organic acid etching-silane grafting-nano-coating," and combines it with composite compatibilizers, nano-barriers, multifunctional chain extenders, and other components. The composite masterbatch is obtained through raw material mixing and melt extrusion; the masterbatch is then blown into a composite film. This invention maintains stable mechanical properties of the film within a wide range of bamboo powder additions without additional fillers, simultaneously achieving barrier and antibacterial functions. Furthermore, the process relies on conventional equipment, is suitable for continuous industrial production, and can be applied to packaging materials, agricultural films, and other scenarios.

The present invention relates to a process for manufacturing a biodegradable composite. The process comprises the following steps: a) providing a bio waste selected from a group comprising a brewery spent grain, food production waste, used ground coffee and composition thereof; b) dewatering of provided bio waste; c) shredding of provided bio waste into pieces; d) drying the shredded pieces until a moisture level into the piece is down to 3-7%; e) grinding of dried pieces into smaller particles so that a size of the particles is less than 350 to 100 micrometres; and f) blending grinded particles with polybutylene succinate in result of which a biomaterial composite is formed, wherein the biomaterial composite comprises 10 to 50 % by weight the grinded particles and 50 to 90 % by weight of polybutylene succinate.

The application relates to the technical field of high polymer materials, and particularly discloses a high-barrier biodegradable composite film and a preparation method thereof. The high-barrier biodegradable composite film comprises an outer layer, a sandwich layer and an inner layer, and the outer layer and the inner layer comprise the following raw materials in parts by weight: 60-80 parts of PLA resin, 10-30 parts of PBS resin, 5-20 parts of PGA resin, 1-2 parts of a plasticizer, 2.5-3 parts of a chain extender, 2-4 parts of a barrier enhancer and 1.5-2.5 parts of maleic anhydride grafted PLA; and the sandwich layer is a fiber film prepared by mixing silane-modified nanocellulose and nanosilver-loaded guar gum nanofiber. The composite film has the advantages of high barrier capacity, good antibacterial effect, long-lasting antibacterial property, high mechanical strength and tight interlayer combination.

This invention belongs to the field of packaging materials technology, and particularly relates to a biodegradable composite film-paper material and its preparation method. The biodegradable composite film-paper material comprises a polymer layer and a paper layer. The polymer layer, by weight, comprises the following components: 70-80 parts polylactic acid, 20-30 parts polycaprolactone, 1-3 parts synergist, 8-10 parts citrate starch, 0.3-1.0 parts lubricant, and 0.2-0.5 parts antioxidant. Experimental results show that the biodegradable composite film-paper material prepared by this invention has an antibacterial grade of 0, a tensile strength of 30-34 MPa, and an elongation at break of 415-450%.

The invention discloses a biodegradable composite fiber and a preparation method and application thereof, and relates to the technical field of degradable composite fiber preparation, the composite fiber is formed by compounding a skin layer and a core layer, the skin layer is a blend of poly (butylene succinate) (PBS) and a rigid molecular chain biodegradable polymer, and the core layer is polylactic acid (PLA); the mass ratio of the skin layer to the core layer is (10: 90)-(90: 10). The rigid molecular chain biodegradable polymer is blended in PBS to serve as a heterogeneous nucleation point, crystallization is accelerated, fiber adhesion is avoided, the spinnability is improved, and the yield is increased. The fiber has the characteristics of super softness, skin friendliness, excellent mechanical properties, high degradation rate and the like, can be widely applied to the fields of underwear, sanitary materials and the like, and is environment-friendly, simple and controllable in preparation process and suitable for industrial popularization, and all the raw materials are biodegradable materials.

The invention relates to the technical field of biodegradable materials, and discloses a low-density high-performance full-biodegradable composite material and a green preparation method thereof. Comprising PBAT resin, low-melting-point modified PGA resin, PPC resin, PLA resin, modified PFM plant fibers, activated hydroxyapatite, a reactive epoxy compatibilizer, a bio-based composite plasticizer, a nano composite nucleating agent and a natural antioxidant system. The preparation method comprises the following steps: treating the PFM plant fibers and the hydroxyapatite; mixing and spraying a liquid bio-based composite plasticizer; and injecting a supercritical fluid, and carrying out underwater pelletizing and drying. The low-melting-point modified PGA resin and the modified PFM plant fiber are introduced, and the reaction type epoxy compatibilizer reacts at the multi-phase matrix interface of the PBAT resin, the PPC resin and the PLA resin to enhance the interface bonding force, so that the high-performance composite material with low density, high strength, high toughness and excellent thermal stability is obtained.

There is disclosed a process of developing a sustainable hybrid composite material, comprising the steps of developing the Extracted Powder Compound from Reject Brine (EPC-RB) and producing a Biodegradable Composite from a Biodegradable Polymer (PLA) reinforced with (EPC-RB). The Extracted Powder Compound from Reject Brine (EPC-RB), which is waste product from different industrial processes, serves as a filler or reinforcement within at least one polymer matrix in different ratios to produce a new hybrid composite material with at least one unique property. Further, reinforcing the Extracted Powder Compound from Reject Brine (EPC-RB) in Biodegradable Polymer (PLA) in different ratios enhances the mechanical, thermal, and other properties of the developed sustainable hybrid composite material.

This invention discloses a modified polylactic acid (PLA) high-temperature resistant biodegradable composite material and its preparation method, relating to the field of degradable materials technology. The modified PLA high-temperature resistant biodegradable composite material of this invention comprises at least the following raw materials in parts by weight: 70-80 parts by weight of polylactic acid; 15-25 parts by weight of lignin-PLA-polycaprolactone block copolymer; 5-10 parts by weight of polybutylene terephthalate-adipate; 2-5 parts by weight of stearic acid-modified nano-silica; 0.3-0.8 parts by weight of anti-hydrolysis agent; and 0.2-0.5 parts by weight of antioxidant. The modified PLA high-temperature resistant biodegradable composite material prepared by this invention improves the mechanical properties and high-temperature resistance of PLA composite materials, and the degradation rate can be controlled by the proportion of each component to meet the application requirements of different scenarios.

This invention discloses a reinforced and toughened PBS-based biodegradable composite material and its preparation method, relating to the field of polyester biodegradable plastics technology. The composite material is composed of the following formulation: PBS resin, PBAT resin, starch, bamboo fiber, talc, compatibilizer, plasticizer, chain extender, antioxidant, and lubricant. This invention constructs a multiphase composite system with PBS resin as the main component, PBAT resin as the toughening phase, and bamboo fiber and talc as synergistic reinforcing components. By combining compatibilizer and chain extender to synergistically regulate the interfacial structure, a stable continuous-dispersed-reinforcing phase coupling structure is formed within the material. Simultaneously, through optimized design of the natural components and interfacial structure, the problems of interfacial debonding and performance fluctuations in traditional composite systems are avoided. The resulting material possesses excellent mechanical properties, processing stability, and biodegradability, exhibiting superior comprehensive application value.

This invention relates to the field of biodegradable materials technology, specifically to a biodegradable composite material for injection molding and its preparation method. The biodegradable composite material is made from the following raw materials in parts by weight: 50-70 parts polylactic acid, 15-25 parts polycaprolactone, 30-40 parts starch, 3-8 parts composite degradable catalytic fiber, 5-10 parts sepiolite powder, 5-10 parts talc powder, 2-5 parts clay, and 1-3 parts plasticizer. In this invention, by introducing a specially formulated composite degradable catalytic fiber as an additive into the injection molding material, not only is the injection molding material highly biodegradable and capable of rapid complete degradation under light exposure, but the mechanical properties of the biodegradable composite material are also effectively improved, giving it high strength and better meeting application requirements.

This invention discloses a biodegradable hemp powder material, belonging to the field of bio-based biodegradable composite materials technology. The material, by mass percentage, consists of 50%–65% modified hemp powder, 25%–40% PLA / PBAT compounded biodegradable matrix, 3%–6% modified inorganic filler, 1%–3% chain extender, and 1%–3% composite additives, and is prepared via a solid-phase pre-crosslinking-stepped melt extrusion process. This invention solves the interfacial compatibility problem between hemp powder and the matrix through microfibrillation-silane grafting composite modification, achieving a material with excellent mechanical properties, barrier properties, and weather resistance even with high hemp powder filling. The degradation rate can be precisely controlled in soil and marine environments, and the bio-based content is ≥60%. It can be widely used in food packaging, disposable products, agricultural mulch films, and other fields.

The invention discloses a preparation method of a PLA-PBAT composite film, and belongs to the technical field of biodegradable composite materials. The composite film is prepared from polylactic acid (PLA), polyterephthalic acid-butylene adipate (PBAT) and rhamnolipid surface modified calcium carbonate through a solution casting method. The preparation method comprises the following steps: dissolving rhamnolipid in an alkaline aqueous solution, and adding calcium carbonate for surface modification to obtain modified calcium carbonate; and blending PLA, PBAT and the modified calcium carbonate in an organic solvent, and casting to form the film. The film has good mechanical properties, and the enzymatic degradation efficiency of the film under the action of protease K is significantly higher than that of a control film containing unmodified or stearin-modified calcium carbonate. The film preparation method provided by the invention is green, simple and convenient, and an effective scheme is provided for preparing high-performance controllable degradable plastic products.

The invention discloses a degradable biological composite material based on PCL and straw filler and a preparation method of the degradable biological composite material, and relates to the technical field of biodegradable composite materials, the biological composite material takes PCL as a matrix and triticale straw and oat straw as filler, and the degradation performance is remarkably improved on the basis of maintaining the performance of the composite material; the straw filler has the advantages of being low in cost, wide in source, renewable, environmentally friendly and the like. The formula and the preparation process of the PCL / straw composite material are simple, the operability is high, and the PCL / straw composite material has wide application potential, especially in the field of degradable biological composite materials. Part of materials of the composite material are derived from natural renewable substances, the composite material has good biodegradability and environment-friendly characteristics, meanwhile, the processing stability of the PCL matrix is ensured, and the composite material is suitable for products such as packaging materials and transplantable seedling pots.

The invention discloses a preparation method and application of a full-biodegradable composite material with high bamboo fiber content, the composite material is prepared from a degradable resin matrix, fine bamboo powder, inorganic mineral filler, an interface modifier and a processing aid, the mesh number of the fine bamboo powder is 100-1200, and the filling amount can reach 60%. According to the invention, a reverse coating two-step process based on a continuous mixing technology is adopted: firstly, a melting additive is used for preferentially wetting bamboo powder to form a microcosmic skin-core structure master batch, and then dilution and reactive compatibilization are carried out through twin-screw extrusion. The calcium sulfate whiskers and the bamboo powder are introduced to construct a microscopic synergistic framework, and a double-peak particle size compounding technology is adopted, so that the problems that the high-content bamboo powder is difficult to disperse, easy to agglomerate and poor in processing fluidity in hydrophobic resin are effectively solved. The prepared material is low in cost and completely biodegradable, has high rigidity and high toughness, and is suitable for the fields of film blow molding, injection molding, sheet extrusion and the like.

The invention belongs to the technical field of preparation of composite films in the field of food packaging materials, and particularly relates to a preparation method of a fig leaf polysaccharide-based biodegradable composite film. According to the invention, fig leaf polysaccharide and chitosan are combined as main film-forming substrates, glycerol is introduced as a plasticizer, calcium chloride and citric acid are taken as cross-linking agents, and Tween-20 is taken as a surfactant, so that a stable three-dimensional network structure is constructed, and the high-performance biodegradable composite film is prepared. The composite film is excellent in comprehensive performance and has good tensile strength, flexibility and transparency, and due to the natural activity of the fig leaf polysaccharide, the film has good oxidation resistance. The raw materials of the composite film are safe and biodegradable, and the composite film has wide application prospects in the fields of food packaging, medical materials, biosensing and the like.

The utility model relates to the technical field of fresh-keeping devices, and discloses a biodegradable composite modified atmosphere fresh-keeping device for fruits and vegetables, which comprises a first thin film and a second thin film which are sequentially arranged from inside to outside, a sealing interlayer is formed between the first thin film and the second thin film, the first thin film is a biodegradable breathable film, and the second thin film is a biodegradable breathable film. The second thin film is a water-blocking film; the second film is a PE film and prevents water vapor from passing through; the first film is an oxygen barrier film, prevents oxygen from passing through and allows carbon dioxide gas and water vapor to pass through. According to the fruit and vegetable fresh-keeping device, a composite film structure is adopted, the first film on the inner layer is arranged to be the biodegradable breathable film, oxygen can be effectively blocked, the breathing process is restrained through carbon dioxide generated by breathing of fruits and vegetables, the gas environment in the fresh-keeping device is adjusted, the shelf life of the fruits and vegetables is prolonged, and the fresh-keeping effect is improved.

The application relates to the technical field of biodegradable materials, in particular to a biodegradable composite sheet and a preparation method thereof, wherein the composite sheet comprises a base material, modified raw materials and powder materials, and also comprises an additive; the base material is PHB and other PHAs; the biodegradable material prepared by the application has a special three-layer structure, has the characteristics of good processability, temperature resistance, low cost and high production efficiency, improves the shortcomings of PHA materials, simultaneously has the original advantages of the PHA materials, can meet the requirements of application fields such as food containers, agricultural materials, medical materials or packaging materials and other materials with biodegradable performance.

The invention relates to the technical field of polymer composite materials, and discloses a PFM-nanocellulose-hydroxyapatite synergistically enhanced biodegradable composite material, which is prepared from the following ingredients in parts by weight: 25 to 43 parts of polylactic acid, 15 to 30 parts of poly (butylene terephthalate)-adipate, 5 to 15 parts of polypropylene carbonate and 3 to 5 parts of polyglycolic acid. 10 to 14 parts of a lightweight modified plant fiber material; 2 to 4 parts of silane modified nano cellulose; 4 to 8 parts of activated hydroxyapatite; 2 to 3 parts of a compound compatilizer; and 4 to 6.5 parts of a processing aid. The multi-component alloy matrix and the multi-scale modified filler are compounded, the density is reduced by using the porous structure of the lightweight plant fibers, and the silane modified nano cellulose is matched to construct a cross-linked network to improve the mechanical strength. The polyglycolic acid and the polypropylene carbonate synergistically regulate and control the degradation kinetics, activate the defects of the hydroxyapatite and the chain extension effect of the compatilizer, and improve the light-oxygen aging resistance and the processing stability of the material.

The invention relates to the technical field of polymer film processing, and discloses a high-blow-up-ratio film blowing forming method of a low-density biodegradable composite material, which comprises the following steps: preparing an outer layer, an inner layer and core layer plant fiber composite particles with the density of 0.58-0.62 g / cm < 3 >; all the layers of materials are co-extruded and plasticized, and the extrusion temperature of the core layer is set to be higher than that of the surface layer to establish melt temperature difference; after the melt is extruded, the blow-up ratio is set to be 4.0-5.0, the internal cooling air temperature is controlled to be lower than the external air ring air temperature, and the ratio of the internal cooling air volume to the external cooling air volume is adjusted to be 0.58-0.78; and carrying out foam stabilization, traction and rolling to obtain the film. Through cooperative regulation and control of the melt temperature difference and the cooling air volume ratio, the problem of film bubble instability of the high filling core layer under the high blow-up ratio is solved, the transverse tensile strength of the film is improved, the anisotropy of the mechanical property is improved, and light weight and high performance of the material are achieved.

The present application relates to a kind of degradable composite material with high water vapor barrier and waterproof, including paperboard and the biodegradable film covered on both sides thereof. Wherein, polylactic acid film is covered on the inside of paperboard, and biodegradable composite film is covered on the outside thereof;The inside film is covered by spraying, and the outside film is covered by first spraying chitosan-based film, and PVA-based composite film is cast or immersed on the chitosan-based film after film formation. Due to the close combination of double-layer film and paperboard, the mechanical properties of the board are further enhanced, and the paperboard is also endowed with excellent water vapor and gas barrier properties. The hydrophobicity of the surface of the outer film endows the material with good waterproofness. The composite material can be used in the field of paper-based beverage containers requiring gas barrier.

The invention provides a biodegradable composite probe wire, a preparation method and application, and relates to the field of optical cables, and the biodegradable composite probe wire comprises a sheath layer and a core layer; the skin layer coats the outer side of the core layer; the skin layer is made of a biodegradable material; the core layer is an optical fiber; the optical cable can solve the problems that in the prior art, a wrapping sheath is made of materials such as polyethylene, the wrapping sheath may generate particle fragments when the optical cable is buried underground or in the sea for a long time, an underground layer or an ocean layer is polluted, and an interference source is formed; pollution to an underground layer and an ocean layer is avoided, and interference sources are reduced.

The invention discloses a hemp tree powder degradable material, and belongs to the technical field of bio-based degradable composite materials. The material is prepared from the following components in percentage by mass: 50-65% of modified hemp tree powder, 25-40% of a PLA / PBAT compound degradation matrix, 3-6% of a modified inorganic filler, 1-3% of a chain extender and 1-3% of a compound additive through a solid-phase pre-crosslinking-stepped melt extrusion process. The problem of interfacial compatibility of the hemp tree powder and a matrix is solved through microfibrillating-silane grafting composite modification, the material has excellent mechanical property, barrier property and weather resistance under high filling of the hemp tree powder, the degradation rate in soil and the marine environment can be accurately regulated and controlled, the bio-based content is larger than or equal to 60%, and the material has good mechanical property and barrier property. The film can be widely applied to the fields of food packaging, disposable products, agricultural mulching films and the like.