77results about How to "No metal residue" patented technology

The invention discloses a method for preparing polylactone through ring opening, and belongs to the technical field of organic catalysis and high polymer materials. A novel catalytic mechanism is put forward, organic alcohol is adopted as an initiator, under the catalysis of an organic catalyst, ring opening polymerization of a cyclic monomer is initiated, and polylactone is obtained; the catalyst is pyridine salt, the method has the advantages that no toxin is generated during the reaction, conditions are simple, and the process is controllable, compared with 4-(N,N-dimethyl amino) pyridine catalysis, during solvent-free polymerization, narrow molecular distribution can be obtained, and the transesterification can be effectively restrained.

The invention discloses an etching solution, an additive and a manufacturing method for metal layout wires. The etching solution is prepared from the following main components in percentage by weight:5-30% of hydrogen peroxide, 0.1-5% of a hydrogen peroxide stabilizer, 5-25% of a chelating agent, 0.1-1% of a surfactant, 0.1-5% of an inorganic acid oxidant, and the balance of deionized water, wherein the additive is added into the etching solution while the etching solution is repeatedly used. The etching solution is free of fluorides, is environmentally friendly, and has the advantages of being moderate in etching rate, proper in etching angle, small in line width loss, free of metal residues, and the like. The additive and the etching solution are combined for use, so that the service life of the etching solution can be greatly prolonged.

The invention relates to a method for producing poly (butylene succinate) (PBS) with lipase as a catalyst. The steps comprises: step (1) 0.05 portion to 10 portions of enzyme, 10 portions to 20 portions of diethyl succinate, 5 portions to 10 portions of butanediol and 0.1 portion to 5.0 portions of water (by weight percentage) react at the temperature of 50 DEG C to 90 DEG C under normal pressurefor 2 hours to 5 hours, then react for 1 hour to 3 hours under the pressure of 4 mmHg to 40mmHg and then for 2 hours to 5 hours when the pressure is resumed to normal; and the process is repeated 3 times to 5 times; step (2) 30 portions to 100 portions of alkane or benzene ring solvent and 0.1 portion to 5.0 portions of water are added and reaction lasts 4 hours to 48 hours at the temperature of 50 DEG C to 90 DEG C when stirring is conducted; step (3) reduced pressure distillation is conducted for 2 hours to 5 hours and the solvent is recovered; and step (4) 15 portions to 20 portions of chloroform are added and dissolves, filtration is conducted and the filtrate is added with 60 portions to 80 portions of methanol and purified, thus obtaining the poly (butylene succinate) (PBS); and thefilter residue is enzyme and can be reused. The method is characterized by economy, low consumption, high output, no metal residue and environmental protection.

The invention provides a boron alkyl-halogenated onium salt system and an application thereof in living polymerization of epoxy monomers and belongs to the field of an epoxy resin. An epoxy monomer active anion controllable polymerization reaction system provided by the invention contains an initiator, a catalyst, a solvent and epoxy monomers, wherein the halogenated quaternary ammonium salt or halogenated quaternary phosphor salt is taken as the initiator and the boron alkyl is taken as the catalyst. The epoxy monomer polymerization system provided by the invention is capable of efficiently triggering the epoxy monomer controllable anionic polymerization reaction under the conditions of shorter period and room temperature. An epoxypropane / ethane polymer prepared according to the system provided by the invention can be applied to the additives of aviation chemical products.