7results about How to "Solve the precipitation problem" patented technology

This invention relates to the field of cellulose acetate (TAC) membrane technology, specifically to a cellulose acetate membrane and its preparation method. The components include a solvent and solid components, by weight, wherein the solid components include: 80-110 parts cellulose, 5-10 parts plasticizer, and 0.1-5 parts benzotriazole derivative, with the solid components comprising 10-30 wt% of the total components. The prepared TAC membrane exhibits the following characteristics: fewer than 3 precipitates on the membrane surface; after high-temperature and high-humidity aging for 1000 h, the TAC membrane has a ΔE value < 0.10, a Δtsb transmittance (380nm-550nm value) < 0.5, and the area ratio of point-like, oily, and contaminant precipitates on the membrane surface is < 1%.

The invention discloses a preparation method of a reactive flame-retardant fiber reinforced nylon plate, and belongs to the field of functional modification of high polymer materials, and the preparation method comprises the following steps: reacting an active flame retardant with a caprolactam monomer and sodium hydroxide to obtain flame-retardant caprolactam sodium; adding the flame-retardant sodium caprolactam, a caprolactam monomer and isocyanate into a glue injection machine, heating, vacuumizing and dehydrating to obtain a mixture; and injecting the mixture into a mold through a glue injection machine, and carrying out polymerization reaction on the flame-retardant sodium caprolactam, caprolactam and isocyanate under the action of a temperature field, so as to prepare the reactive flame-retardant fiber reinforced nylon plate. The phenyl-containing phosphorus-based active flame retardant is directly polymerized onto a molecular chain of caprolactam in the polymerization stage of sodium caprolactam, the flame retardant is combined with nylon molecules through firm covalent bonds, the problem of precipitation of the flame retardant is fundamentally solved, and the phenyl group of the flame retardant can improve the thermal stability of nylon.

A preparation method of the pyrolysis device material for producing high-purity vanadium pentoxide comprises the following steps: (1) ultrasonic treatment; (2) electric pulse treatment; (3) microwave treatment; and (4) heat treatment is conducted, specifically, the 316 stainless steel plate subjected to microwave treatment in the step (3) is placed in a closed reactor, vacuumizing is conducted, the temperature is increased to 200-300 DEG C, heat preservation is conducted, octanol is added, the octanol exists in a gaseous state, the pressure in the reactor is made to be 1000-2000 Pa, the temperature is kept for 10-30 min, vacuumizing is conducted to discharge the octanol, then the temperature continues to be increased to 850-950 DEG C, heat treatment is conducted, and the 316 stainless steel plate is obtained. Through octanol treatment, octanol can permeate and be adsorbed on the surface of the stainless steel material, the performance of the stainless steel material is improved, element precipitation is resisted, and the performance of the 316 stainless steel is more stable. The problem of impurity element precipitation of the 316 stainless steel material in the prior art is mainly solved through physical means, main chemical components of the stainless steel material are not changed, and the chemical performance of the stainless steel material is hardly influenced.

The invention belongs to the technical field of pharmaceutical preparations, and discloses a local external composition containing a 5 alpha-reductase inhibitor and a preparation method thereof.The composition comprises 0.01%-0.1% of dutasteride or pharmaceutically acceptable salt thereof, 3%-14% of crystal inhibitor and 85.9%-96.99% of solvent based on the total weight of the compound.The preparation process is simple, the composition is prepared, and the preparation method is simple. The problem that the dutasteride is easy to crystallize and separate out in the using process due to extremely low solubility is solved, the stability of the dutasteride is improved, the curative effect of the dutasteride is ensured, the bioavailability of the dutasteride is improved, the systemic side effect caused by oral administration is reduced, the safety of the dutasteride is improved, and the medication compliance of a patient is improved.

The application provides an antibacterial agent and a preparation method and application thereof, the antibacterial agent comprises two different repeating units; the structural formula of the antibacterial agent is or by adopting the technical scheme of the application, the antibacterial agent prepared by adopting a copolymerization method has excellent antibacterial performance and long-acting stability, and can meet the requirement of products on long-acting antibacterial performance of the antibacterial agent.

This invention belongs to the field of polymer functional materials technology, specifically relating to a biodegradable light-converting film with intrinsic fluorescence and its applications. The biodegradable light-converting film is prepared from a biodegradable copolyester with aggregation-induced emission properties. The biodegradable copolyester is polymerized from a polymerizable monomer, a first monomer providing rigid conjugated units, and a second monomer providing flexible spacer units. In the main chain structure of the biodegradable copolyester, the longest linear spacer segment between any two adjacent rigid conjugated units derived from the first monomer has ≥10 carbon atoms. Through precise molecular structure design, the aggregation-induced emission properties are chemically bonded to the biodegradable polyester main chain, fundamentally solving the problems of easy migration, aggregation quenching, and high cost of the light-converting agent in traditional additive-type light-converting films. This light-converting film exhibits efficient and stable intrinsic fluorescence in the solid state, with tunable fluorescence color, and possesses good mechanical properties and biodegradability.

The application provides a MEMS piezoelectric device, relates to the field of semiconductor technology, and comprises an electrode layer, the electrode layer comprises a bottom electrode and a middle electrode, or the electrode layer comprises a bottom electrode, a middle electrode and a top electrode, and a piezoelectric layer is arranged between the bottom electrode and the middle electrode and between the middle electrode and the top electrode; when the top electrode is provided with a through hole structure, below the through hole structure corresponds the middle electrode and / or the bottom electrode in the stacking direction; when the middle electrode is provided with a through hole structure, below the through hole structure corresponds the bottom electrode in the stacking direction. The problems of grain boundary precipitation in the piezoelectric layer area above the electrode layer corresponding to the through hole structure are solved, the surface deposition quality of the device is ensured, the precision of through hole etching can be improved, the connection quality of the through hole is ensured, and the performance of the MEMS system is ensured.