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46results about How to "Product performance is stable" patented technology

Method for producing printed circuit board

The invention discloses a method for manufacturing a printed circuit board that comprises procedures as following: a. An inner flexible board carries out the procedures of making inner circuit, drilling via-hole and performing lamination treatment; b. an inner base board etched with a circuit and resin material carry out lamellar lamination build-up to acquire a multi-layer base board; c. The multi-layer base board carries out the procedures of opening the joint window of a flexible board by CNC and treating surface of the multi-layer base board; and then performing lamination of a rigid-flex board; d. The via-hole of a rigid board is drilled and the outer surface of the multi-layer base board is etched with the circuit to obtain a multi-layer printed circuit board. As the invention adopts a copper adhesive via-hole method, the cooper conductive adhesive adopted by the via-hole does not cause 'sliver displacement' that silver paste may result in. What is more, as the copper conductive adhesive is poured into the via-hole for electric connection by adopting a printed via-hole method, production efficiency is greatly improved. As processing sequence that circuit is etched first and then the via-hole is drilled is adopted, product performance is more stable. Therefore, the method is applicable to the scale production and manufacture of the multi-layer printed circuit board.

Irradiation-proof serum separating medium

The invention belongs to the technical field of preparation of high polymers and particularly discloses an irradiation-proof serum separating medium and a preparation method thereof. The irradiation-proof serum separating medium is made of the following materials by weight: 100 parts of acrylate, 0.8-2 parts of benzoyl peroxide, 1-4 parts of hydrophilic gas-phase silicon dioxide, 0.02-0.10 part of a silane coupling agent and 60-120 parts of an organic solvent. The irradiation-proof serum separating medium provided by the invention has the advantages that the product performance is stable, favorable physiologic inertia, thixotropy and closure are achieved, the appearance is colorless and transparent, and each physiologic inertia index meets the requirement according to hospital clinical examinations. The irradiation absorbed dose reaches 25 kGy, after irradiation, the irradiation-proof serum separating medium can be stored naturally for one year without obvious change in each product parameter, the performance completely meet customer demands, the product production process is safe and environment-friendly, and the production technology meets the requirement of cleaner production. The successful development of the product fills the gap of irradiation-proof serum separating medium in China.
Owner:湖北新德晟材料科技有限公司 +1

Preparation method of emulsion-polymerized styrene butadiene rubber

InactiveCN102585095AMolecular weight adjustment effect is goodProduct performance is stableSolventButadiene-styrene rubber
The invention provides a preparation method of emulsion-polymerized styrene butadiene rubber. The preparation method is characterized in that an irreversible addition-fragmentation chain transfer agent with the following general formula is adopted; an aqueous phase is prepared and then an oil phase is prepared; after the irreversible addition-fragmentation chain transfer agent is dissolved in styrene, butadiene is added into a reaction bottle, the temperature is reduced, and a emulsification reaction is conducted for 15 to 30 minutes; finally, an oxidant organic liquor is added into the reaction bottle; after a conversion rate reaches 60 percent to 70 percent, a terminator liquor is added into the reaction bottle and a polymerization termination reaction is conducted for 5 to 10 percents; after the polymerization termination reaction is fulfilled, a demulsification reaction is conducted with solvents of sulfuric acid and a methanol to form gel; and after the gel is milled and dried, the low temperature emulsion-polymerized styrene butadiene rubber is obtained. Compared with data of traditional emulsion-polymerized styrene butadiene rubber using tert-dodecyl mercaptan as a molecular weight regulator, the preparation method has the advantages that the comprehensive performance is not changed, odor produced by using alkyl hydrosulfide is avoided, the monomer conversion rate is increased by 5 to 8 percent, the product performance is steady, and the reproducibility is high.

Production method for microorganism metabolite organic formaldehyde removing agent

A production method for a microorganism metabolite organic formaldehyde removing agent comprises the steps that streptococcus thermophilus, candida utilis and lactobacillus plantarum are inoculated into an aerobic culture medium and an anaerobic culture medium to carry out fermentation respectively; when the cell concentration of all the fermentation solutions reaches 106/ml, the aerobic culture bacterium solution, the anaerobic culture bacterium solution and a mixed culture medium are mixed at the proportion of 1:1:3, the mixture is poured into a fermentation bucket to carry out anaerobic fermentation for 20 days, and fermentation is ended when the pH value reaches around 7; fermentation metabolites are separated through a membrane separation technology, viable organism thalli are filtered out, and thus filter liquor containing the fermentation metabolites is obtained. According to the production method, three kinds of beneficial strains are screened according to the microecology principle, and reasonably matched and combined into multiple microorganisms for fermentation, and damage to the structure of the metabolites by high-temperature treatment is avoided through the combined fermentation technology and the membrane separation technology; meanwhile, the metabolism solution without the viable organisms has the good effects of formaldehyde removing, dust collecting, sterilizing and indoor air refreshing, and the product performance is more stable.

Preparation method for temperature-sensitive medium used for wax temperature control valve

The invention discloses a preparation method for a temperature-sensitive medium used for a wax temperature control valve. The preparation method comprises the following steps: with F-T synthetic product containing C9-C20 components and more than 85 wt% of normal paraffin as a raw material, in the presence of a catalyst, carrying out hydro-conversion so as to convert olefins and oxygen-containing compounds in the synthetic product into proper components for the temperature-sensitive medium used for a wax temperature control valve; distilling a product obtained after hydrogenation and preparing a fraction in a fraction range of 260 to 340 DEG C so as to obtain a target product. Temperature of a wax temperature control valve prepared from the product obtained in the invention is controllable in a range of 5 to 30 DEG C, and stroke values at each DEG C are basically identical. The method provided in the invention is simple in terms of process, produces no three wastes (waste gas, waste water and industrial residue) and is an environment-friendly production method; the product can be used for wax automatic temperature control devices which are in need of uniform lift and is especially applicable as a temperature-sensitive medium for a wax heating temperature control valve.

Gliclazide sustained-release capsule and preparation process thereof

The invention relates to the technical field of medicines, in particular to a gliclazide sustained-release capsule and a preparation process thereof. The content filled in the capsule is gliclazide micro-pills of which the surfaces are coated with sustained-release film coatings, and the gliclazide micro-pills are prepared from the following raw materials in portion by weight: 30 to 35 portions ofgliclazide, 30 to 50 portions of microcrystalline cellulose, 40 to 60 portions of lactose, and 30 to 70 portions of water. The sustained-release film coatings are prepared from the following raw materials in portion by weight: 5 to 20 portions of EudragitRS100, 10 to 40 portions of EudragitRL100, 10 to 40 portions of talc powder, and 1,000 portions of 95 percent ethanol solution. The method for preparing the gliclazide sustained-release capsule comprises the following steps: firstly, crushing the gliclazide; secondly, taking a proper amount of the gliclazide powder according to a gliclazide micro-pill formula to perform pelletizing so as to obtain the gliclazide micro-pills; and thirdly, coating the gliclazide micro-pills. The gliclazide sustained-release capsule can well control the in vivo release rate of the gliclazide and is safe and long-acting.


The invention relates to a magnetron which comprises an anode part and a cathode part; the anode part comprises an anode tube, anode blades which are fixed on the inner surface of the anode tube, and a large cross ring chain, a small cross ring chain and an output antenna which are arranged in the anode tube; the cathode part comprises a central support rod component and a spiral filament which is wound on the central support rod component; a pair of conical magnetic poles, which are made of soft magnetic materials, is symmetrically arranged in the axial direction of the anode part; the oscillation wavelength of a main oscillation pi mode of the magnetron is lambda, and the frequency is fo; the distance s from the top ends of the anode blades to the bottoms of the conical magnetic poles is between 0.04 lambda to 0.1 lambda; and the heights ha of the anode blades are between 0.14 lambda to 0.20 lambda. According to the invention, the main mode oscillation frequency and the coupling degree of the magnetron basically remain unchanged, so that the oscillation of a parasitic mode on the end is farther from the main mode oscillation frequency, and the magnetron which oscillates stably in the pi mode and has high microwave output efficiency. The product performance is stable, the structural design is simple, the process is convenient to realize and the cost is low.

Aspartic acid-citric acid copolymer and preparation method thereof

The invention relates to an aspartic acid-citric acid copolymer and a preparation method thereof, and relates to a polyaspartic acid modified product capable of serving as a water treatment agent and a synthetic method of the polyaspartic acid modified product. The aspartic acid-citric acid copolymer aims to solve the defects that an existing polyaspartic acid modified product is complex in synthetic process, slow in reaction speed, unstable in product performance, low in CaCO3 scale inhibiting ratio and the like. The structural formula of the aspartic acid-citric acid copolymer is as shown in the description. The synthetic process comprises the following steps: using aspartic acid and citric acid as raw materials, under the microwave conditions of 865-965 MHz or 2400-2500 MHz and 400-10000 W, adding a small amount of catalyst and an appropriate amount of an organic solvent, radiating for 1-30 min, and synthetizing an intermediate, wherein the organic solvent is completely recycled in a gas form, and the aspartic acid-citric acid copolymer is obtained from the intermediate through basic hydrolysis. The aspartic acid-citric acid copolymer has the advantages of simple technology, high reaction speed, high yield, energy saving, little pollution, stable product performance and the like, and the scale inhibition effect of the product is obviously improved.
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