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1910 results about "Polyaspartic acid" patented technology

Polyaspartic acid (PASA) is a biodegradable, water-soluble polymerized amino acid. It is a biodegradable replacement for water softeners and related applications. In nature, PASA has been found in as fragments of larger proteins with length up to 50 amino acids, but as of 2004 had not been isolated as a pure homo polymeric material from any natural source. The first isolation of synthetic oligomeric sodium polyaspartate, obtained by thermal polycondensation of aspartic acid, was reported by Hugo Schiff in late 19th century. Later it was proposed that thermal polymerization process leads through polysuccinimide intermediate. Polyaspartic acid is produced industrially in both the acid form and as the sodium polyaspartate salt.

Immobilized and activity-stabilized complexes of LHRH antagonists and processes for their preparation

In this invention, a release-delaying system is to be developed for LHRH antagonists, in particular for cetrorelix, which allows the active compound to be released in a controlled manner over several weeks by complexation with suitable biophilic carriers. The acidic polyamino acids polyglutamic acid and polyaspartic acid were selected for complexation with cetrorelix. The cetrorelix polyamino acid complexes are prepared from aqueous solutions by combination of the solutions and precipitation of the complexes, which are subsequently centrifuged off and dried over P2O5 in vacuo. If complexes having a defined composition are to be obtained, lyophilization proves to be a suitable method. The cetrorelix-carboxylic acid complexes were also prepared from the aqueous solutions. In the random liberation system, the acidic polyamino acids poly-Glu and poly-Asp showed good release-delaying properties as a function of the hydrophobicity and the molecular mass of the polyamino acid. In animal experiments, it was possible to confirm the activity of the cetrorelix-polyamino acid complexes as a depot system in principle. It is thus possible by complexation of cetrorelix with polyamino acids to achieve testosterone suppression in male rats over 600 hours. The release of active compound here can be controlled by the nature and the molecular mass of the polymers.
Owner:ZENTARIS GMBH

Selenium and ferrum-enriched organic inorganic fertilizer and application method thereof

The invention relates to a formula of a fertilizer, and a using method for the fertilizer. A selenium and ferrum-enriched organic inorganic fertilizer used for producing selenium and ferrum-enriched rice is prepared by mixing selenite, ferrite, a nitrogen fertilizer, a phosphate fertilizer, a potash fertilizer, a decomposed organic fertilizer and a silicon fertilizer in a ratio, and granulating. The selenium and ferrum-enriched organic inorganic fertilizer is prepared from the following components in part by weight: 0.004 to 0.010 part of selenite, 1 to 5 parts of ferrite, 15 to 33 parts of nitrogen fertilizer, 12 to 24 parts of phosphate fertilizer, 10 to 17 parts of potash fertilizer, 0.02 to 0.08 part of sodium of polyaspartic acid or salt thereof, 30 to 50 parts of decomposed organic fertilizer and 5 to 8 parts of silicon fertilizer. The fertilizer contains selenium and ferrum, also contains other nutritional fortification substances required by growth of crops, can simultaneously provide selenium, ferrum and nutritional fortification substances required by the growth for the crops, contributes to the growth of the crops, improves the absorption rate and conversion rate of the selenium and the ferrum, and achieves an effect of producing the selenium and ferrum-enriched rice reaching the selenium and ferrum-enriched rice standard by applying a small amount of selenium and ferrum.
Owner:广东海纳农业有限公司 +1

Water-soluble mineral fertilizer and preparation method thereof

The invention discloses a water-soluble mineral fertilizer, belongs to the field of crop fertilizers, and particularly relates to a water-soluble inorganic mineral fertilizer. The water-soluble mineral fertilizer is composed of an A component, a B component and a C component, wherein the A component is composed of potash feldspar, powdered rock phosphate, medical stones, kieselguhr, bentonite and a water-soluble hydrophilic grafting agent; the B component is composed of urea, biological nitrogen-fixing bacteria, a urease inhibitor, a nitrification inhibitor and carboxymethyl starch, and the C component is composed of polyaspartic acid, polyyvinylpyrrolidone and casein. A preparation method of the water-soluble mineral fertilizer takes an inorganic mineral powder body as a main raw material, the water-soluble hydrophilic grafting agent is utilized, and the inorganic mineral powder body is dissolved in the water to form a stability colloid. The water-soluble mineral fertilizer provided by the invention contains a large number of nitrogen phosphorus and potassium elements and also contains different medium/trace elements and rare earth elements required by the growth of a plant, a soil structure is improved, the growth of the plant is improved, the product quality of a crop is improved, a raw material is easily available, the price is low, the raw material is non-pollution, the production technology is simple, and a market prospect is wide.
Owner:甘肃百金惠戈壁农业科技有限公司

Scale and corrosion inhibitor for treating circulating cooling water

The invention relates to a scale and corrosion inhibitor for treating circulating cooling water, which is prepared from the following components in percentage by weight: 10 to 35 percent of polyaspartic acid (PASP) or polyepoxysuccinic acid, 10 to 35 percent of sodium gluconate, 0.15 to 3 percent of methyl benzotriazole, 1 to 5 percent of imidazoline and deionized water. The polyaspartic acid (PASP) or the polyepoxysuccinic acid (PESA) with biodegradability serving as a main body is compounded with the deionized water, the methyl benzotriazole, the sodium gluconate and the imidazoline to form a phosphorus-free product; the sodium gluconate has good synergy with the methyl benzotriazole and the imidazoline, so the scale and corrosion inhibiting effect is good, and scale formation, corrosion and bacteria and algae propagation of the circulating water can be effectively prevented; and when the added mass concentration is 20mg/L, the corrosion rate is 0.0561mm/a. Under the same water quality condition, the scale and corrosion inhibitor has low adding concentration, low adding quantity and low cost compared with other like products; and the scale and corrosion inhibitor is stable at a high temperature, has certain chlorine resistance and oxidation resistance, can ensure that a system has no scale or corrosion or the like, and can be adapt to the water quality of various complex severe working conditions.
Owner:HUBEI ZO TAI ENVIRONMENT TECH

Synergistic composite fertilizer and method for preparing same

The invention discloses a synergistic compound fertilizer and a preparation method thereof. The synergistic compound fertilizer of the invention is characterized in that: poly-aspartic acid or aspartate and phosphate-dissolving agents are added into common compound fertilizer, wherein, the weight percentage of the compound fertilizer, the poly-aspartic acid or the aspartate and the phosphate agents is respectively as follows: 75.0 to 99.98 percent of the compound fertilizer, 5.0 to 0.01 percent of the poly-aspartic acid or the aspartate and 20.0 to 0.01 percent of the phosphate-dissolving agent. The phosphate-dissolving agents are the combination of one or a plurality of oxalic acid, citric acid, tartaric acid, acrylic acid, zeolite powder and humic acid. The preparation method of the synergistic compound fertilizer of the invention is that the current device and technology of producing fertilizers using the granulating method are adopted to add the poly-aspartic acid or the aspartateand the phosphate-dissolving agents into a granulator after the poly-aspartic acid or the aspartate and the phosphate-dissolving agents are measured by the measuring device arranged at the front of the granulator. The synergistic compound fertilizer can greatly facilitate the full absorption of trace elements such as nitrogen, phosphorus, potassium by crops, which can comprehensively improve fertilizer utilization ratio and the quality of crops.
Owner:HEBEI XIETONG ENVIRONMENTAL PROTECTION TECH CO LTD

Polyaspartic acid ester polyurea protective paint with good corrosion resistance, preparation method, using method and application

The invention belongs to the technical field of spraying polyurea elastic materials, and discloses polyaspartic acid ester polyurea protective paint with good corrosion resistance. The polyaspartic acid ester polyurea protective paint with the good corrosion resistance is mainly prepared from the following raw materials: a material A and a material B, wherein a molar ratio of NCO in the material Ato NH in the material B is 1.05-1.1; the material A is mainly prepared from 20-40% of polyether glycol and 60-80% of polyisocyanate; and the material B is mainly prepared from 70-85% of polyasparticacid ester, 1-5% of nano oxidized graphene, 5-10% of nano metallic oxide filler, 5-10% of pigment and filler, 1-3% of a defoamer, 1-3% of a flatting agent and 2-5% of an adhesion promoter. The invention provides a preparation method, a using method and application of the polyaspartic acid ester polyurea protective paint. The invention has the advantages that after aging the polyaspartic acid esterpolyurea protective paint for 350 d, a change rate of tensile strength is less than 4.5%, and a change rate of elongation at break is less than 5.0%, the polyaspartic acid ester polyurea protective paint has a good mechanical property and corrosion resistance, an adhesive force is stronger, capacity of an anti-corrosion coating to resist an environmental change in practical application can be improved, and maintenance cost is reduced.
Owner:四川嘉宝莉涂料有限公司
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