51results about How to "Avoid high temperature heating" patented technology

The invention discloses that the invention provides a lead brass rod suitable for high-speed automatic processing, which comprises the following components by weight percentage: Cu 57.5-59.5%, Pb 2.7-3.5%, Sn 0.01-0.3%, Fe 0.01-0.3%, other metal elements ≤ 0.3%, the balance is zinc and unavoidable impurities; wherein, other metal elements are one or more of magnesium, calcium, cerium, phosphorus; the present invention also provides the lead Process for the preparation of brass rods. The grain size produced by the invention is 5-15um, the α-phase ratio is 65-85%, and the number of lead particles is greater than 12000 / 1mm 2 Leaded brass rods with excellent cutting performance are suitable for automation, intelligence, high-speed and precision processing requirements.

The invention provides an alternating copolymerization method for preparing a fluoropolymer on the basis of a dibromide compound and a diene monomer. The alternating copolymerization method comprisesthe following steps: (1), adding two types of bifunctional monomers A and B, a metal photocatalyst and a promoter into a mixed organic solvent system, homogenizing the system by stirring in a reactioncontainer, performing deoxidizing operations for four times, and sealing the reaction container; (2), performing a polymerization reaction through photocatalysis; (3), after the reaction, adding tetrahydrofuran to dilute a polymerization system, pouring into methanol for precipitation, performing suction filtration and drying to obtain a needed alternating polymer. A perfluorodiiodide monomer isexpanded to a perfluorodibromide monomer and a common alkane dibromide compound, so that the application range of the monomers for the gradual transfer of free radicals, addition and termination polymerization is further expanded; moreover, the capability of the polymerization method in designing the microstructures of functional high molecular materials is also improved, and more selectivity is provided for obtaining functional polymers with different microstructures.

The invention belongs to the technical field of food processing, and in particular relates to a green banana starch, and also relates to a preparation method and an application of the above-mentioned green banana starch. In the present invention, immature green bananas with skin are directly crushed and ground in a color-protecting solution, then treated with enzyme preparations and extraction solvents, and then screened to remove slag and peeled fibers to obtain coarse starch milk, which is further centrifugally concentrated, washed, and dehydrated. , drying to obtain the final starch product. The present invention can use the defective fruit and malformed fruit in bananas as raw materials for starch production, and at the same time effectively alleviates the rot loss caused by oversupply in peak harvest season and lagging storage and preservation conditions, and improves resource utilization and product added value; And in the process of preparing green banana starch, avoid high-temperature heating, prevent starch granules from swelling and collapsing, and protect starch structure from damage, and the obtained green banana starch is rich in amylopectin, and will not agglomerate during storage. Has unique tackifying and gelling properties.