38results about How to "Overcoming the problem of poor stability" patented technology

The invention discloses a method for preparing a capsanthin microcapsule, comprising the following steps of: (1) preparing capsanthin core phase; (2) preparing modified starch capsule phase; (3) mixing the capsanthin core phase and the modified starch capsule phase and emulsifying and homogenizing the mixture into emulsified liquid with a nanometer grain diameter at high pressure; and (4) drying the emulsified liquid to obtain the capsanthin microcapsule. The method for preparing the capsanthin microcapsule microencapsulates capsanthin by adopting microencapsulation technology and coats the capsanthin (core) into the microcapsule with a nanometer grain diameter by using single capsule modified starch. The method for preparing the capsanthin microcapsule has simple process, and the prepared product has good water solubility and high stability.

The invention relates to deep-water low-temperature low-density early-strength cementing slurry for well cementation in petroleum drilling engineering, which contains 100 parts of low-temperature early-strength cement, 10 to 30 parts of low-temperature reinforcing material, 10 to 80 parts of low-density light-weight material, 0.5 to 4 parts of drag reducer, 2.5 to 8 parts of fluid loss additive, 0.1 to 5 parts of retarder, 0.15 to 1.2 parts of defoamer, 2.5 to 8 parts of early strength agent and 57 to 95 parts of water, and slurry with the density of 1.2g / cm3 to 1.7g / cm3 can be prepared. The slurry system at least has the following advantages that: the maximum early strength (24 hours) can reach 14.7MPa, the long-term strength stability is good, the static gelling transition time is short, and the system is stable. The invention provides technical support for the quality of deep-water well cementation.

The invention relates to a highly stable organic lead iodide crystal material and its preparation method and application. The chemical formula of the crystal material is [Pb 2 I 2 (H 2 O) 0.75 ] 2+ [ – o 2 C(CH 2 ) 4 CO 2 – ], the crystal structure belongs to the monoclinic system, the space group is C2 / c, and [Pb 2 I 2 ] The inorganic components are in the form of two-dimensional layers, and the layers are connected by disodium adipate organic ligands. Compared with the prior art, the present invention overcomes the disadvantages of poor stability of the existing hybrid organic-inorganic perovskite materials and the difficulty of realizing photocatalytic water splitting, combined with the advantages of the present invention such as simple preparation process, it is a promising solution in the field of photocatalysis. have potential application value.

The invention provides a water-dispersibility paprika red pigment micro emulsion and a preparation method thereof. The preparation method comprises steps that a surfactant is mixed with a cosurfactant, then an oil phase comprising paprika red pigment and edible oil is added, stirring is carried out and water is added so as to obtain a system, the system firstly becomes clear and then turbid, when the water is added to reach a certain quantity, the system suddenly becomes clear and transparent again, so as to obtain the water-dispersibility paprika red pigment micro emulsion, the mass percent content of the paprika red pigment in the micro emulsion reaches 1.98%-9.86%. The preparation method has the advantages that the pasty paprika red pigment is prepared into water-dispersibility paprika red pigment micro emulsion, so that the dispersibility of the paprika red pigment in the water and the stability of the paprika red pigment in the hot processing are improved; the preparation method is simple, low in production cost and beneficial for large scale production. The water-dispersibility paprika red pigment micro emulsion can be used in fluid food, semifluid food and high moisture food, and the application field of fat soluble paprika red pigment is enlarged.

The invention discloses a microwave photonic down-conversion method based on a dual-drive polarization division multiplexing Mach-Zehnder modulator (PDM-MZM), and solves a problem of poor stability and noise performance in the prior art. The method comprises the following steps of inputting an optical carrier signal; generating a radio frequency signal and a local oscillator signal; setting a direct-current bias voltage of a sub-modulator; generating a modulation optical signal; carrying out beam splitting on the modulation optical signal; detecting the modulation optical signal; and restraining noise by an electric subtraction device. According to the method, the noise is restrained through dual-drive one-time modulation of the PDM-MZM and a difference obtained by the electric subtractiondevice, so that the stability and the noise performance are improved.

The invention provides fluorinated modified sulfonated polyarylether as shown by a general formula (1), and simultaneously provides a method for fluorinating and modifying polyarylether and application of the fluorinated modified sulfonated polyarylether in preparing a proton exchange membrane. The invention aims to overcome the defects that the prior proton exchange membrane applied to fuel batteries has a complex synthetic route, a high preparation cost or lower performance. The fluorinated modified sulfonated polyarylether is prepared by drying sulfonated polyarylether and then performing reactions between the sulfonated polyarylether and mixed gas of fluorine gas / nitrogen gas at a temperature of lower than 100 DEG C; and in the application of preparing the proton exchange membrane, the sulfonated polyarylether can be ground into powder and prepared into a thin membrane after fluorinated modification, and then the thin membrane is subjected to acidizing, or the sulfonated polyarylether is prepared into the thin membrane, and then the thin membrane is subjected to acidizing after the fluorinated modification. The thin membrane prepared by the method has good mechanical properties, thermal stability and oxidation stability, and simultaneously the proton exchange rate and the proton conductivity of the membrane are improved; besides, the thin membrane has good dimensional stability and battery performance, and has an extensive application prospect in the field of fuel batteries.