4 results about "CITRATE ESTER" patented technology

The invention discloses a cleaning fluid applied for automatic biochemical analyzers, comprising: at least one anion surface active agent, at least one nonionic surface active agent, an alkali metal hydroxide, an alkali metal citrate and a buffer agent for stabilizing pH value above 13.0. The cleaning fluid has low protein residual rate, low fatty material residual rate, good in-batch repeatability, low cross pollution and low reactant deposition rate in clinical application after cleaning. And the cleaning fluid will not affect the test result of biochemical analyzers, and has not corrosion on the liquid circuit system and reaction cup of analyzers. All components of the cleaning fluid can be degraded biologically, to avoid potential environment pollution and meet environment protection requirement.

The invention discloses a calcium citrate producing method includes following steps: (1) contacting a citric acid fermentation clear liquid with heavy calcium carbonate to obtain a crude calcium citrate crystal; (2) acidically hydrolyzing the crude calcium citrate crystal with hydrochloric acid to obtain a solution and filtering the solution; and (3) contacting a filtrate with one or more of a carbonate of alkali metals, a hydroxide of the alkali metals, an oxide of the alkali metals, ammonium carbonate and ammonium bicarbonate. The producing method can obtain the crude calcium citrate crystal precipitation directly through reaction between the simply-filtered impurity-containing crude citric acid fermentation clear liquid and the heavy calcium carbonate and then the high-purity calcium citrate, which is 99.9-99.99% in purity and can reach a standard in United States Pharmacopeia USP33-NF28 and American food additives FCC5, can be obtain just by performing one filtering process for removing impurities and performing a contact reaction between the obtained filtrate and one or more of the carbonate of alkali metals, the hydroxide of the alkali metals, the oxide of the alkali metals, the ammonium carbonate and the ammonium bicarbonate.

The invention discloses a PVC (Polyvinyl Chloride) composite material and a preparation method thereof. The PVC composite material is prepared from the following raw materials in parts by weight: 90 to 110 parts of polyvinyl chloride resin, 8 to 12 parts of PBT (Polybutylene Terephthalate) resin, 1 to 5 parts of triethyl acetyl citrate, 2 to 8 parts of calcium carbonate, 1 to 2 parts of methyltin mercaptide, 1 to 3 parts of an inorganic flame retardant and 0.01 to 0.1 part of an anti-ageing agent. The PVC composite material provided by the invention has the advantages of simple and stable construction technology and low cost and has excellent mechanical property, flame-resisting property and antibacterial property; meanwhile, the PVC composite material has ageing resistance, high temperature resistance and long service life.

The invention discloses a preparation method of biodegradable cast film paper, which comprises the steps of weighing the following raw materials in parts by weight: 60 to 70 parts of poly (butylene terephthalate)-adipate, 30 to 40 parts of polylactic acid, 10 to 15 parts of polyethylene glycol, 2 to 4 parts of citrate, 5 to 8 parts of nanofibers, 2 to 4 parts of silicon dioxide and 2 to 4 parts of a silicone slipping agent, wherein the molecular weight of the silicone slipping agent is 0.9-1.1 million. The manufacturing method comprises the steps of mixing the raw materials, carrying out mixing extrusion through a twin-screw extruder, and granulating the extruded material to prepare plastic particles; preparing the plastic particles into a film by adopting a tape casting method; and performing uniaxial stretching on the film, and performing stretching and shaping to obtain a finished product. By adopting the manufacturing method of the biodegradable cast film paper, the problem that a cast film cannot be degraded is solved, meanwhile, the water vapor permeability is relatively good, the cost is reduced, and the preparation method is simple.