151results about How to "Fully biodegradable" patented technology

A microfluidic device includes, in one embodiment, a first silk film coupled to a second silk film with at least one microchannel therebetween.

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 preparation method of degradable glycolic acid copolyester. Glycolic acid copolyester with high molecular weight is obtained by condensation polymerization of glycollic acid, adipic acid and ethylene glycol. The direct condensation polymerization is adopted, so that the whole process is short in procedure, less in side reaction and low in energy consumption during production; glycollic acid, adipic acid and ethylene glycol are taken as raw materials, so that the cost of the raw materials is low. Thus, the finally obtained glycolic acid copolyester is low in production cost. The prepared glycolic acid copolyester is high in intrinsic viscosity, good in mechanical property and excellent in practicability. In addition, the glycolic acid copolyester is completely prepared by the condensation polymerization of biodegradable monomers, so that the glycolic acid copolyester has the complete biodegradability; catalysts containing stannum, plumbum and the like, which have large toxicity, are not adopted in the preparation process, so that the glycolic acid copolyester is nonhazardous to a human body. As a result, the glycolic acid copolyester disclosed by the invention is a safe and environment-friendly high molecular material.

The invention relates to a manufacturing method of plant fibre products, which comprises the steps: pulverized substances containing textile plants are poured into a banburying kneader and chemical pretreatment solution is added, so the fibre pretreatment chemical modification is realized simultaneously when mechanical physics modifying is realized; after entering into an expansion extruder for expansion modification, the pulverized substances are added with various additives and fillings, which are banburied and kneaded together, and the banburying kneading substance is rolled into particles by a particle rolling machine; or plant fibre subjected to banburying kneading chemical modification and various additives and fillings are directly and together banburied and kneaded and then are extruded and produced to form particles or extrusion sectional materials by the expansion extruder; the produced particles or sectional materials can be used for producing plant fibre products of various types and performances and plant fibre products of sheets, sectional materials, paper, membranes, and the like by utilizing the prior plastic injection machine, extruder, blow moulding machine, rubber refining machine, calander, hot press, and equipment and technology principles of microwave and infrared, steam drying, and the like so as to replace plastic, plastic foam, woodworks, paper and membranes.

A method of making porous silicon using a chemical etchant comprising metal ions is described.

The invention discloses a novel cryogenic soaping agent. The novel cryogenic soaping agent is characterized by comprising the following components in percentage by weight: 5-25% of laccase, 25-45% of persulfate, 15-35% of alkali, 15-25% of polyvinylpyrrolidone, 15-25% of sodium polyacrylate and 5-10% of sodium carboxymethyl cellulose. The novel cryogenic soaping agent is applied to a soaping process after reactive dyeing, and can effectively remove a flooding color, a paste material and an auxiliary agent on fabric at a relatively low temperature to improve the color brilliance, color fastness and cleanliness of the fabric.

A ramie fabric reinforced polylactic acid composition able to be fully biodegradated is prepared through respectively dissolving the polylocatic acid and polycaprolactone in organic solvent, treating the surface of ramie fabric, immersing it in said polycaprolactone solution, adding the solution of polylactic acid, sealing and in-situ polymerizing.

The invention discloses a preparation method of a completely biodegradable resin made of non-staple grain plant modified starch. The method comprises the steps of: first putting non-staple grain plant starch into a reaction vessel, adding water to prepare it into starch milk, and heating it to a proper temperature, conducting stirring and washing, then adding chemicals into a water solution for modification grafting treatment, and then separating water and starch through centrifugation, and conveying the separated modified starch to an airflow drying system for dewatering and drying, then taking 100 parts of dried modified starch, adding 5-50 parts of a compatilizer, 2-15 parts of an anti-block agent, 0-100 parts of polylactic acid, and 150-250 parts of a completely biodegradable copolymer of dibasic acid and dibasic alcohol, and mixing them uniformly, carrying out extrusion granulating or tabletting under an appropriate temperature and pressure, thus obtaining a resin material or sheet special for complete biodegradation. The resin of the invention has both the usage function similar to ordinary plastic products and a complete biodegradability. And after being used and abandoned, the resin can be degraded into carbon dioxide and water that can be consumed by the environment.

The invention provides a green and efficient concentrated solution for a hydraulic support system and a preparation method of the green and efficient concentrated solution. The concentrated solution is prepared from components in percentage by mass as follows: 5%-8% of soybean oil, 3%-5% of coconut oil, 4%-6% of potassium hydroxide, 2%-3% of trans-polyether, 7%-10% of polyglutamic acid, 10%-12% ofsebacic acid, 1%-2% of fatty alcohol polyoxyethylene ether, 6%-10% of triethanolamine, 2%-4% of monoethanolamine, 10% of glycol, 0.1%-0.3% of methylbenzotriazole, 1%-2% of trimethyl hexahydrotriazine, 0.1%-0.3% aqueous polyether, 0.01%-0.02% of Congo red and the balance of reagent process water. The concentrated solution is obtained through multiple steps as follows: carboxylic acid amide is prepared from the soybean oil, the coconut oil, triethanolamine and monoethanolamine through a saponification reaction, and methylbenzotriazole, the sebacic acid and carboxylic acid amide are compounded with a metal sustained release agent.

The invention relates to a multi-medium biological aerated filter and a method for treating traditional Chinese medicine decoction piece wastewater using the same in the technical field of water treatment. The multi-medium biological aerated filter is characterized in that in the direction perpendicular to the bottom of the filter, a back flush water outlet weir plate and a normal water outlet weir plate are arranged to sequentially divide the multi-medium biological aerated filter into a filter body, a back flush water outlet chamber and a normal water outlet chamber; in the direction parallel to the bottom of the filter, a primary filter screen, a primary filter plate, a secondary filter plate and a secondary filter screen are sequentially arranged in the water filtering direction to divide the filter body into a water inlet chamber, a suspension filler chamber, a biological ceramsite filter material chamber, an activated carbon filler chamber and a clear water layer; and the suspension filler chamber provides a space for growth and propagation of activated sludge, thereby ensuring that products generated after ozone oxidizes heterocyclic and aromatic organic matters can be sufficiently subjected to biodegradation. According to the traditional Chinese medicine decoction piece wastewater treatment process provided by the invention, grit and inorganic salt particles in wastewater can be effectively removed and cleaned, thereby ensuring effective removal of pollutants in the wastewater, reducing energy consumption, and lowering the cost.

The invention discloses a biodegradable ultraviolet-blocking weather-proof micro-nano composite material and an application thereof. The material is obtained by carrying out melt blending on 1-100 parts by mass of micro-nano particles with a core-shell structure and 50-10000 parts by mass of a biodegradable polymer matrix at a temperature of 100-250 DEG C for 5-40 minutes, and can be used as various thin films, sheet materials or board materials with ultraviolet protection and weather resistance. The contained micro-nano particles are a core-shell modified bio-based material, wherein the shellmainly comprises a dopamine polymer, and the core is lignin. The mechanical property of the micro-nano particles can be effectively improved by regulating and controlling morphology and material composition of the shell layer, ultraviolet blocking performance and weather-proof stability of the micro-nano particles is improved, and compatibility of the micro-nano particles with the polymer matrixis improved. The coating disclosed by the invention has good ultraviolet blocking property and weather resistance and is economic and environmentally friendly, operation is simple, and a wide application prospect is achieved in the aspect of ultraviolet protection and weather-proof polymer material preparation.