Chiral ionic compound containing pyrrolidinyl radical and its preparation and application

Method for preparing aromatic-aliphatic copolyester

The invention relates to a method for preparing aromatic-aliphatic copolyester. In the method, aromatic binary acid, dihydric alcohol and aliphatic hydroxy acid are used as a copolymerization system to prepare the aromatic-aliphatic copolyester by direct melt polycondensation under the action of a catalyst, wherein the dihydric alcohol is one or both of aliphatic dihydric alcohol and cyclized aliphatic dihydric alcohol. The method overcomes the defect of the generation of poisonous methanol in the prior ester exchange process. By the random copolymerization, a polylactic acid chain segment can be introduced to an aromatic polyester chain segment, and the sequence length of an aromatic component is reduced, thereby improving the degradation property of the copolyester and keeping better mechanical behavior; moreover, the method also has the advantages of simple synthesis process, easy reaction operation and low-priced and easily obtained materials, and the obtained copolyester has certain ...

Method for preparing degradable organic-inorganic nanometer hybrid material containing POSS (Polyhedral Oligomeric Silsesquioxanes)

The invention discloses a method for preparing a degradable organic-inorganic nanometer hybrid material containing POSS (Polyhedral Oligomeric Silsesquioxanes), comprising the following steps of: (1) firstly, preparing a difunctional POSS derivative (II) by carrying out the addition reaction of amino POSS (I) and 2-hydroxyethyl acrylate through Michael; and (2) secondly, forming an etherified product by carrying out the esterification reaction of aromatic dibasic acid and aliphatic dihydric alcohol and preparing the degradable organic-inorganic nanometer hybrid material containing the difunctional POSS through the melt polycondensation reaction of the difunctional POSS derivative (II) and aliphatic chydroxy oligomer with the etherified product. The preparation method has the advantages ofuniform dispersion and difficult agglomeration of POSS in the hybrid material during preparation, effective improvement on the performances of degradable copolyester composite material, simple operation ...

Shallow lake sediment suspending particles capturer

A shallow lake sediment suspended particulate acquirer comprises collecting pipes system, a collecting bracket system and a floating ball and weight fixation system. The diameter of the collecting pipes is 5-20 centimeters, the ratio of the height to the diameter being between 5 and 10; the collecting pipe is fixed on the collecting bracket by iron clamps and clamping bolts, each collecting bracket can be provided with two or four collecting pipes symmetrically; under the function of the floating ball weight fixation system, the acquirer is fixed on the pointed position under the water, and the collecting pipes are kept vertical all the time. The sediment particulates of a certain period are collected by the acquirer and analyzed, thereby ensuring the study of the suspending and sediment conditions of the lake sediment in different space time and different environmental conditions.

Method for producing unfried instant stewed noodles

The invention relates to a method for producing unfried instant stewed noodles, which comprises the following raw materials in percentage by weight: 80 to 90 percent of high protein flour, 10 to 20 percent of starch, 2 to 3 percent of edible salt, 2 to 5 percent of edible glue and 0.2 to 0.5 percent of composite alkali. In the invention, the technology of making noodles by drawing out the dough by hand is combined with a microwave drying technology and a heated-air drying technology; when the microwave drying technology is acted on noodles, the heated air drying is used to lead the evaporation velocity of water on the surfaces of the noodles to be higher than the evaporation velocity of water in the noodles; and when the heated air drying technology is acted on noodles, the evaporation velocity of water in the noodles is higher than the evaporation velocity of water on the surfaces of the noodles, so the moisture contents in and on the surface of the product produced by using the two drying ...

Method for preparing aromatic-aliphatic copolyester

The invention relates to a method for preparing aromatic-aliphatic copolyester. In the method, aromatic binary acid, dihydric alcohol and aliphatic hydroxy acid are used as a copolymerization system to prepare the aromatic-aliphatic copolyester by direct melt polycondensation under the action of a catalyst, wherein the dihydric alcohol is one or both of aliphatic dihydric alcohol and cyclized aliphatic dihydric alcohol. The method overcomes the defect of the generation of poisonous methanol in the prior ester exchange process. By the random copolymerization, a polylactic acid chain segment can be introduced to an aromatic polyester chain segment, and the sequence length of an aromatic component is reduced, thereby improving the degradation property of the copolyester and keeping better mechanical behavior; moreover, the method also has the advantages of simple synthesis process, easy reaction operation and low-priced and easily obtained materials, and the obtained copolyester has certain ...

Method for preparing degradable organic-inorganic nanometer hybrid material containing POSS (Polyhedral Oligomeric Silsesquioxanes)

The invention discloses a method for preparing a degradable organic-inorganic nanometer hybrid material containing POSS (Polyhedral Oligomeric Silsesquioxanes), comprising the following steps of: (1) firstly, preparing a difunctional POSS derivative (II) by carrying out the addition reaction of amino POSS (I) and 2-hydroxyethyl acrylate through Michael; and (2) secondly, forming an etherified product by carrying out the esterification reaction of aromatic dibasic acid and aliphatic dihydric alcohol and preparing the degradable organic-inorganic nanometer hybrid material containing the difunctional POSS through the melt polycondensation reaction of the difunctional POSS derivative (II) and aliphatic chydroxy oligomer with the etherified product. The preparation method has the advantages of uniform dispersion and difficult agglomeration of POSS in the hybrid material during preparation, effective improvement on the performances of degradable copolyester composite material, simple operation ...