166results about How to "Avoid white pollution" patented technology

The invention discloses a biaxial drawing polylactic acid compound film with a barrier property and a preparation method thereof. The compound film comprises two polylactic acid layers and a barrier layer arranged between the two polylactic acid layers, wherein each polylactic acid layer comprises the following components in weight percentage: 75-100 percent of crystalline polylactic acid, 0-5 percent of melt reinforcing agent, 0-5 percent of toughening agent, 0-5 percent of antistatic agent, 0-5 percent of antioxygen, 0-5 percent of slipping agent and 0-5 percent of antiblocking agent, and the barrier layer is fully biodegradable and is provided with a carbon dioxide copolymer with the gas barrier property. According to the preparation method, a multilayer co-extrusion gradual or synchronous biaxial drawing process is adopted. The compound film can be fully biodegradable, has very good oxygen, carbon dioxide and moisture barrier property, higher tensile strength, high puncture resistance and high deflection, and can be used for packages of foods, cosmetics, electronic products, chemicals and the like.

The invention relates to a degradable composite film and a preparation method thereof. The degradable composite film comprises, by weight, 35-45 parts of polylactic acid, 15-22 parts of polyvinyl alcohol, 18-25 parts of starch, 12-17 parts of corn stalk powder, 8-13 parts of chitosan, 14-20 parts of lignocelluloses, 7-13 parts of light calcium carbonate, 4-9 parts of diatomite, 7-12 parts of vermiculite powder, 3-8 parts of zinc oxide, 2-7 parts of epoxidized soybean oil and 0.5-3 parts of defoamers. The degradable composite film and the preparation method thereof have the advantages that the film is mainly prepared from the polylactic acid, and the starch, the corn stalk powder, the chitosan and the lignocelluloses are added compatibly, so that the film has high biological degradability and is safe and environment friendly, and white pollution is avoided; the zinc oxide, the diatomite and the vermiculite powder serve as activating agents, strength and tenacity of the film can be improved, and migration rate of plasticizers can be lowered; the raw materials are easy to get, the price is low, the preparation process is simple, and good economic benefit is achieved.

The invention relates to a fully degradable biomaterial and a thin film product thereof, and discloses the fully degradable biomaterial which consists of 75-90 percent by weight of PBAT (Poly (Butylene Adipate-co-Terephthalate)) and the balance of PLA (Poly Lactic Acid) and a thin film product prepared by taking the fully degradable biomaterial as a master batch. The fully degradable biomaterial and the thin film product thereof have the advantages of full degradability, water resistance, oil resistance, high tensile strength, high flexibility, physical and chemical properties similar to those of an LDPE (Low-Density Polyethylene) plastic thin film, single component, simple process, low energy consumption required for production and being a superior alternative for the LDPE plastic thin film.

The invention relates to a high-barrier-property biodegradable mulching film and a preparation method thereof, belonging to the field of high-polymer materials. The high-barrier-property biodegradable mulching film is prepared from a polylactic acid resin, a toughener, a heat stabilizer, an ultraviolet absorbent, a chain extender, an antioxidant, an opening agent and the like by using a film blowing machine set. The high-barrier-property biodegradable mulching film can be automatically degraded under the actions of rich oxygen and microbes, does not pollute the environment, has higher barrier property than the LDPE (low-density polyethylene) film with the same thickness by 1.5-2.0 times, and satisfies the functions of moisture retention, water preservation and yield increase for crops. The method has the advantages of simple production technique and high production efficiency, and can easily implement industrial production.

The invention discloses a paste-type degradable plastic film and belongs to the agricultural plastic film production field. Humic acid, film forming agents, surfactants, modifiers, fertilizers and water are used to prepare black or brown paste; the paste is then diluted by water and sprayed out to form a film-shaped structure on the soil surface. Compared with the prior art, the paste-type degradable plastic film of the invention has low cost, good effect, convenient packaging and transportation, as well as good promotion and application value.

The invention relates to a degradable liquid mulching film and a production method thereof, particularly to an environment-friendly degradable liquid mulching film with straws as a basic raw material and a production method thereof. The degradable liquid mulching film is prepared from steaming slurry of crop straws (such as wheat straws, rice straws, cotton straws, wood shavings, and the like) or straws paper-making black liquor as a main raw material by a series of reactions, such as sulfonation, crosslinking and copolymerization, of macromolecules in the slurry or the black liquor, such as lignin, cellulose and polysaccharides, under the action of a film formation additive. The macromolecules in the degradable liquid mulching film have a large amount of hydrophilic groups which can effectively catch the water molecules evaporated and diffused from soil to the air, so as to prevent water evaporation and heat loss arising therefrom, thereby increasing the temperature and preserving soil moisture. The degradable liquid mulching film is helpful for increasing crop yield and improving crop quality; and the yield is higher than that by use of a plastic mulching film, and the per mu yield is increased by more than 5%. The degradable liquid mulching film can replace the conventionally used plastic mulching film.

The invention provides a transparent, tear-resistant and biodegradable polylactic acid thin film and a preparation method thereof, belonging to the field of high molecular material and solving the technical problem of high brittleness, poor tear resistance and poor flexibility of the polylactic acid thin film in the prior art. The transparent, tear-resistant and biodegradable polylactic acid thin film comprises a mixture of polylactic acid, a toughening agent, a plasticizer, a lubricant and a plastic lubricant. The preparation method comprises the following steps: mechanically mixing polylactic acid, the toughening agent, the plasticizer, the lubricant and the plastic lubricant to obtain a premix at first; feeding the premix from the feeding opening of a twin-screw extruder; metering the plasticizer and adding the metered plasticizer from the liquid feeding opening of the twin-screw extruder; and pelleting by melt extrusion to finally obtain the transparent, tear-resistant and biodegradable polylactic acid thin film. The elongation at break and tearing strength of the polylactic acid thin film provided by the invention are improved obviously, the transparency of polylactic acid is retained, the brittleness defect of the polylactic acid thin film is solved, the rheological behavior of the material is improved obviously, the tensile strength is 43.2MPa at most, the elongation at break is 48%, and the right angle tear strength is 127KN/m.

The invention provides a transparent and toughening polylactic acid resin and method for preparing the same. The polylactic acid resin consists of polylactic acid, methyl methacrylate-butyl acrylate copolymer as the flexibilizer, citrate plasticizer, pentaerythritol toltetranitrate (Benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-) as the antioxidant and tris (2,4-ditert-butylphenyl) phosphate. First, premix is prepared by mixing polylactic acid, flexibilizer, plasticizer and antioxidant mechanically. Then the premix is subject to melt extrusion and granulation by utilizing double-screw extruder. The above method has the advantages of increasing the anti-impact strength, tensile strength and elongation at break of polylactic acid and maintaining the transparency thereof. In addition, the viscosity of the blends is decreased, thereby remedying the defects of brittleness of polylactic acid and improving the rheological behavior of materials obviously. The impact strength is up to 60.1KJ/M2.The light transmittance and the haze of the products are 89% and 8.5% respectively when the thickness thereof is 0.04mm.The above polylactic acid resin, instead of PE and PVC, is applicable to the preparation of films, plates, sheet materials, foamings and injection moulding plastics.

A liquid-state ground film for improving soil and preventing loss of water and soil contains goudron and/or asphalt, water, cationic surfactant, stabilizer, protecting agent and additive. Its advantages are low cost, and high filming performance and stability.

The invention provides a preparation method of a high-transparency easy-to-tear polylactic acid blow-molded film. The high-transparency easy-to-tear polylactic acid blow-molded film is composed of a mixture of polylactic acid (PLA), polyterephthalic acid-adipic acid-butanediol ester (PBAT), a plasticizer acetyl tributyl citrate, a lubricant ethylene bisstearamide, an opening agent erucyl amide anda nucleating agent white carbon black. The preparation method comprises the following steps: weighing PLA, PBAT, a plasticizer, a lubricant, an opening agent and a nucleating agent in proportion, adding into a mixer, uniformly mixing, adding from a feeding hole of a double-screw extruder, carrying out melt extrusion, water cooling, pelletizing and drying to obtain special modified polylactic acidfilm-blowing resin, and carrying out water cooling blow molding film formation by a film blowing machine through a down-blowing method to obtain the high-transparency easily-torn polylactic acid blow-molded film. According to the invention, the PBAT, the plasticizer, the lubricant, the opening agent and the nucleating agent have a synergistic effect, so that the tensile elongation at break of thepolylactic acid film can be effectively improved, the polylactic acid film has high transparency, the flat wrinkle-free easy-to-tear high-transparency complete biodegradable film is obtained, the tensile strength is as high as 54.6 MPa, and when the thickness of the film is 0.025 mm, the light transmittance reaches 94% or above and the haze reaches 5.3%; and the film has good mechanical properties and excellent transparency, and can replace PE, PP, PVC and other films.

The invention discloses an edible plant starch-cellulose composite packaging film for meat products and relates to the technical field of edible packaging films. The packaging film is prepared from raw materials in parts by mass as follows: 80-100 parts of plant starch, 50-60 parts of hydroxypropyl methylcellulose, 30-35 parts of sodium carboxymethyl cellulose, 15-18 parts of sodium alginate, 12-15 parts of curdlan, 10-12 parts of low-methoxyl pectin, 8-10 parts of calcium citrate, 10-15 parts of cloves, 10-15 parts of cassia bark, 10-15 parts of spices, 5-8 parts of tea polyphenols, 10-12 parts of rapeseed oil, 8-10 parts of agar, 6-9 parts of genipin, 5-8 parts of polyglycerol fatty acid ester, 3-6 parts of edible wax and 800-1000 parts of water. The plant starch and the cellulose are used as main raw materials, and proper aids are used as auxiliary materials, so that the prepared packaging film for the meat products has higher physical and mechanical properties, the barrier property and antibacterial and anti-oxidation effects; besides, the packaging film can be eaten together with the products, so that the ecological environment is protected.

The invention provides a polylactic acid (PLA)/ poly(butylene succinate-butylene adipate) (PBSA) blown film and a preparation method thereof. The blown film comprises a mixture of PLA, PBSA, plasticizer diethylene glycol monobutyl ether adipate, a lubricant, a plastic lubricant and an antioxidant. The PLA, the PBSA, the lubricant, the plastic lubricant and the antioxidant are first mechanically mixed into a premix, the premix is added through a feeding port of a twin-screw extruder, meanwhile the plasticizer diethylene glycol monobutyl ether adipate is metered and added in through a liquid feeding port of the twin-screw extruder, modified polylactic acid blown film special resin is prepared by melt-extruding, water-cooling, pelletizing and drying, the modified polylactic acid blown film special resin is blown by a film blowing machine to form a transparent tear-resistant biodegradable film. The PBSA, the plasticizers, the lubricant, the plastic lubricant and the antioxidant can effectively increase the tensile elongation at break and tear strength of polylactic acid films, maintains the transparency of the polylactic acid, and solves the brittleness defects of the polylactic acid films. The polylactic acid (PLA)/ poly(butylene succinate-butylene adipate) (PBSA) blown film has good mechanical properties and excellent transparency, and can replace PE, PP, PVC and the like for preparation of films and sheets.

A structural plastics-wood-metal composition is prepared from waste or used thermoplastic plastics, reinforcing particles, metallic structural member and modifier. Its advantages are high compression strength and bending strength, and environmental friendlinezz.

The invention relates to the field of cotton planting, in particular to a cultivation method of southern XinJiang film-free cotton. The method comprises the steps of choosing early-maturing upland cotton varieties for use, wherein the cotton varieties mature within 120 days under the film-mulching cultivation condition and mature within 135-140 days under the film-free cultivation condition; conducing fertilization and ploughing for sowing, wherein the planting density is 240,000-255,000 plants.hm<-2>; when cotyledons stretch flat, conducting continuous chemical regulation twice, wherein the usage amount of mepiquat chloride is 1.4-1.6 g.hm<-2> and 0.8-1.2 g.hm<-2> respectively, and the usage amount of mepiquat chloride is 4.3-4.8 g.hm<-2> after topping is conducted; conducting water and fertilizer management and disease pest and weed prevention and control in a growing period. According to the cultivation method of the southern XinJiang film-free cotton, the cotton does not need to be covered with mulching film, and thus white pollution caused by the mulching film is prevented; the specific early-maturing upland cotton varieties are selected and adopted, by adding a proper amount of base fertilizer and with the assistance of chemical regulation and water and fertilizer management, sufficient nutrients are provided for all stages of growth of the cotton, later maturity, yield reduction and quality lowering caused by later sowing are overcome in the cultivated cotton, and thus the yield is steadily increased, and the quality is gradually improved.

The invention discloses starch modified full-biobased PBSA biodegradable plastics and a preparation method therefor. The preparation method comprises the steps: (1) providing full-biobased polybutylene succinate/adipate (PBSA); (2) subjecting the full-biobased PBSA and starch to vacuum drying separately; (3) adding the dried full-biobased PBSA, the dried starch, a chain extender, an antioxidant, aplasticizer, a lubricant and a thermal stabilizer into a high-speed mixer, and carrying out uniform mixing; (4) subjecting the obtained mixed material to extruded granulating by a twin-screw extruder; and (5) carrying out film blowing on the composite plastic granules at a certain temperature, thereby obtaining the starch modified full-biobased PBSA biodegradable plastics. According to the starchmodified full-biobased PBSA biodegradable plastics prepared by the method disclosed by the invention, after composite modification, the requirements on complete degradation are met, meanwhile, the mechanical properties of pure PBSA resin are enhanced, the production cost is reduced effectively, and thus, the marketing is better facilitated.

The invention discloses a movable lifting type plastic garbage crushing device, and belongs to the technical field of garbage recycling equipment. The device comprises fixed supporting legs and a machine cover, wherein a sleeve is arranged on each fixed supporting leg in a sleeving mode; a movable supporting leg is arranged below each sleeve; a supporting block is arranged below each movable supporting leg; a wheel plate frame with a rolling wheel is arranged on each supporting block; a rotary drum cutter is arranged in the middle position of the interior of the machine cover; a fixed drum cutter is arranged on the outer side of the rotary drum cutter; left and right partition plates are arranged on the shell of the fixed drum cutter; left and right hobs are arranged above the fixed drum cutter; a feeding port is arranged above the left hob and the right hob; and a material collecting cylinder is arranged at the outer bottom end of the fixed drum cutter. The movable lifting type plastic garbage crushing device is novel in structure and clear in working principle, and compared with traditional waste plastic equipment, height adjustment can be carried out and mobile operation can becarried out, thus the crushing efficiency is improved, the development of the waste plastic recycling industry is promoted, prevention of the problem that the white pollution is intensified is facilitated, and the device has important significance on the environment protection.