9 results about "Calcium pyrophosphate" patented technology

The invention relates to a sliding material based on PTFE polymer with a filler to improve the friction properties, wherein the filler comprises at least one phosphate, in particular calcium phosphate, calcium pyrophosphate, magnesium phosphate, magnesium pyrophosphate, lithium phosphate, hydroxyapatite or combinations thereof, and at least one metal sulfide, wherein the proportion of metal sulfide is > 2%. The invention also relates to the use of the sliding material.

The invention relates to calcium pyrophosphate biological ceramic with a bone-imitating oriented structure as well as a preparation method and application of the calcium pyrophosphate biological ceramic. The bone-imitating oriented structure calcium pyrophosphate biological ceramic has a layered structure formed by alternately arranging calcium pyrophosphate crystal phase layers formed by dehydration condensation of brushite and amorphous carbon layers formed by carbonization of carboxymethyl chitosan. The bone-imitating oriented structure calcium pyrophosphate biological ceramic has significantly improved strength and toughness, also has good cytocompatibility, and is a potential load-bearing bone repair material. The bionic design based on the bone tissue orientation structure provides a new strategy for preparing high-strength and high-toughness bioactive materials.

The invention discloses a production method and application of toothpaste-grade calcium pyrophosphate, the production method comprises the following steps: mixing calcium hydrophosphate with a magnesium source, heating to 750-830 DEG C at a rate of 4-6 DEG C / min, calcining for 2-4 hours, then carrying out three-gradient cooling on the calcined product, and finally crushing to obtain the toothpaste-grade calcium pyrophosphate, wherein the three-gradient cooling comprises the steps of heating and slowly cooling to 500 DEG C at the speed of 10-15 DEG C / min, then naturally cooling to 100-150 DEG C, and finally cooling to below 50 DEG C at the speed of 3-5 DEG C / min. The prepared toothpaste-grade calcium pyrophosphate is high in beta-phase conversion rate, small in tooth abrasion value, uniform in particle size distribution, excellent in performance when applied to toothpaste grinding materials and wide in application prospect.

The present invention relates to a pharmaceutical composition for preventing, ameliorating, or treating calcium pyrophosphate deposition disease and hypophosphatasia, comprising a benzotriazole derivative having inhibitory activity against ectonucleotide pyrophosphatase-phosphodiesterase.

The invention belongs to the technical field of agricultural environment-friendly materials, and relates to a PLA / PBAT biodegradable composite mulching film for quinoa, which is prepared from the following raw materials in parts by mass: 45 to 50 parts of PLA, 50 to 55 parts of PBAT, 6 to 8 parts of biodegradable regulator, 20 to 30 parts of modified crop straw powder, 1 to 3 parts of biodegradable silver master batch, 2 to 4 parts of nano zinc oxide, 0.5 to 1 part of chain extender containing epoxy group, 3 to 5 parts of compatibilizer containing epoxy group and 0.2 to 0.5 part of lubricant. The biodegradation regulator has a core-shell structure, the core is C12-C18 choline carboxylate, and the shell is calcium pyrophosphate; the modified crop straw powder is obtained by sequentially impregnating superfine crop straw powder with an inorganic alkali solution, impregnating with a quaternary ammonium salt type surfactant aqueous solution and modifying with an epoxy silane coupling agent. The mulching film disclosed by the invention can basically keep a complete structure in the growth period of the quinoa in the high-altitude saline-alkali area, has a cooling function in a high-temperature period in summer, and can be quickly degraded within 40-60 days after the quinoa is harvested.

The application belongs to the technical field of biodegradable polymer materials, and relates to a controllable biodegradable high-strength polylactic acid composite mulching film and a preparation method thereof. The mulching film is a three-layer composite structure, and the layers from top to bottom are a surface layer, a middle layer and an inner layer. The raw materials of the surface layer include PLA, PPC, PCL and a core-shell structure degradation regulator. The core-shell structure degradation regulator takes an imidazole phosphate as a core and takes calcium pyrophosphate as a shell. The raw materials of the middle layer include PLA, PBAT, an epoxy-containing compatibilizer and an epoxy-containing chain extender. The raw materials of the inner layer include PLA, starch and humic acid. The core-shell structure degradation regulator has a slow-release catalytic function and has a regulating effect on the degradation of the mulching film. The surface layer of the composite mulching film provides a degradation regulating function. The middle layer provides mechanical support. The inner layer activates soil bacteria and promotes crop growth. The three layers realize the contradictory requirements of high initial strength, long functional period and rapid degradation in the later period through synergistic action.

The invention discloses a flotation inhibitor and a lime inhibition-free flotation method for high-sulfur lead zinc ore. The flotation inhibitor is zinc calcium pyrophosphate. The flotation method comprises the following steps: (1) crushing, screening and grinding the high-sulfur lead-zinc ore to obtain ore powder; (2) adding the ore powder and water into a flotation tank, stirring, and adding an inhibitor, a collecting agent and a foaming agent for flotation; the inhibitor is zinc calcium pyrophosphate. The flotation inhibitor has the effect of selectively inhibiting sphalerite and pyrite in the high-sulfur lead-zinc ore, the grade and the recovery rate of lead concentrate are improved, lime does not need to be added in the flotation process to inhibit the high-sulfur lead-zinc ore, and the flotation inhibitor has both environmental protection and economic benefits.

The invention belongs to the technical field of biodegradable high polymer materials, and relates to a controllable biodegradable high-strength polylactic acid composite mulching film and a preparation method thereof.The mulching film is of a three-layer composite structure and sequentially comprises a surface layer, a middle layer and an inner layer from top to bottom; the surface layer comprises the following raw materials: PLA, PPC, PCL and a core-shell structure degradation regulator, and the core-shell structure degradation regulator takes imidazole phosphate as a core and calcium pyrophosphate as a shell; the middle layer is prepared from the following raw materials: PLA, PBAT, a compatibilizer containing an epoxy group and a chain extender containing an epoxy group; the inner layer is prepared from the following raw materials: PLA, starch and humic acid. The degradation regulator with the core-shell structure has a slow-release catalysis function and has a regulation effect on degradation of a mulching film. The surface layer of the composite mulching film provides a degradation regulation function; the middle layer provides mechanical support; the inner layer activates soil flora and promotes crop growth; through the synergistic effect of the three layers, the contradictory requirements of high initial strength, long functional period and rapid degradation in the later period of the mulching film are met.

A purpose of the present invention is to provide a negative thermal expansion material including a zinc-phosphorus composite oxide having excellent negative thermal expansion properties.　The negative thermal expansion material includes a composite of a zinc-phosphorus composite oxide and a calcium pyrophosphate salt, and is characterized in that the zinc-phosphorus composite oxide includes a zinc-phosphorus composite oxide represented by a general formula (1) (ZnxMyPz1Ot1), and the calcium pyrophosphate salt includes a calcium pyrophosphate salt represented by a general formula (2) (Caw1Aw2Pz2Ot2).