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33results about How to "Excellent repeatability" patented technology

Method for chemical gaseous phase deposition of silicon nitride film by electron cyclotron resonance plasma

The invention discloses a low-temperature manufacturing method of silicon nitride film used in passivation layer of an integrated circuit. The silicon nitride film grows on a substrate positioned inside a deposition chamber. The method comprises cleaning the substrate and placing inside the working chamber, vacuumizing the working chamber and presetting working conditions, introducing a mixed gas composed of silicon source gas and nitride source gas into the working chamber, performing ionization and decomposition of the mixed gas with the action of energy absorbed from a microwave source upon electron cyclotron resonance effect, transferring active charged particles produced by the ionization and decomposition to the surface of the substrate with the action of permanent magnetic field, and depositing silicon nitride film on the substrate. The working conditions are as follows: working chamber pressure: 0.1-5Pa, microwave power: 600-2000W, deposition temperature: room temperature to 300 DEG C, total gas flow: 50-300sccm, flow ratio of silicon source gas to nitride source gas: 1:6 to 1:12, and substrate rotation speed: 60 r/min. The inventive method can rapidly and uniformly deposit the low-hydrogen silicon nitride film (6 inch thickness) at low temperature (below 300 DEG C), which is used as a material for passivation layer of integrated circuit or optical devices.
Owner:XIDIAN UNIV

Patch

The invention provides a patch having excellent repeated adhesive ability. The patch includes a support body and an adhesive layer. The adhesive layer includes (A) polyacrylic acid and / or salt thereof, (B) poly alkylene oxide series water-absorbent resin, (C) an adhesive composition of organic acid selected from more than one of tartaric acid, malic acid, lactic acid and citric acid; the average mean molecular weight of the (A) is more than 3 millions, the hybrid-mass of the (A) and the (C) meets a relation that [acrylate units of the (A)-carboxyl of the (C)] / [ the acrylate units of the (A)+ acrylic acid units of the (A)] <=0.22; and the pH of the adhesive composition is 4-5.5, and the water content is more than 80 mass%.
Owner:LION CORP

Dynamic covalent cross-linking material for enhancing polyethylene performance and preparation method and application thereof

The invention belongs to the technical field of high polymer materials, and particularly relates to a dynamic covalent cross-linking material for enhancing polyethylene performance and a preparation method and application thereof. The dynamic covalent cross-linking material is prepared from linear polyethylene with a borate group and a borate cross-linking agent through a borate exchange reaction,wherein the borate cross-linking agent is prepared from polybasic boric acid molecules and 1, 2-diol molecules or 1, 3-diol molecules through a dehydration condensation reaction; according to the dynamic covalent cross-linking polyethylene material, conversion and recombination of a polymer network can be realized through reversible exchange reaction among different borate groups. The dynamic covalent cross-linking polyethylene is added into commercial thermoplastic polyethylene to synthesize a polyethylene/dynamic cross-linked polyethylene composite polymer material; the mechanical properties (such as tensile strength and Young's modulus), creep resistance, solvent resistance, heat resistance and the like of the composite polymer material are remarkably enhanced, and the composite polymer material can be used for repeated processing, repeated shaping and 3D printing.
Owner:FUDAN UNIV

Modified polyester hot melt adhesive and preparation method thereof

InactiveCN105441005AHigh tensile strength and low temperature impact strengthGood tear resistanceNon-macromolecular adhesive additivesFilm/foil adhesivesChemistryPolyamide
The invention relates to a modified polyester hot melt adhesive and a preparation method thereof. The modified polyester hot melt adhesive is prepared from components in parts by weight as follows: 40-70 parts of a polyester hot melt adhesive, 30-50 parts of a polyamide based organic silicon thermoplastic elastomer, 0.5-1 part of an antioxidant 164 and 1-3 parts of an auxiliary. The polyamide based organic silicon thermoplastic elastomer and organic bentonite are jointly adopted to modify the polyester hot melt adhesive, and the polyamide based organic silicon thermoplastic elastomer has high tensile strength and low-temperature impact strength, good tear resistance and good chemical resistance; the organic bentonite has good thixotropy and chemical stability, proper quantities of the polyamide based organic silicon thermoplastic elastomer and the organic bentonite are added, promote each other and have a synergistic effect, efficient modification of the polyester hot melt adhesive is realized, the low-temperature toughness, the aging resistance and the anti-stripping performance of the polyester hot melt adhesive can be remarkably improved, the processing performance is excellent, the bonding strength to metal-epoxy resin is high, and repeated processing performance for residual leftover materials is good.
Owner:林初煌

A novel method for measuring hydrogen pumping capability of mitochondria

The invention discloses a novel method for measuring hydrogen pumping capability of mitochondria, and belongs to the field of scientific research and experiments. The method includes S1) putting a magnetic stirrer below an absorption cell rack of a spectrophotometer; S2) setting the spectrophotometer into a time scanning state; S3) adding an absorption cell into the spectrophotometer, adding KCl into the absorption cell, starting the magnetic stirrer and starting scanning; S4) adding 8-hydroxy-1,3,6-pyrenetrisulfonic acid; S5) adding ferrocytochrome c, valinomycin, 2,3-dimethoxy-5-methyl-6-(10-bromo)-1,4-benzoquinone and a mitochondrion solution; S6) recording an absorption value A1 after an absorption line is flat; S7) adding 1 [mu]L of sodium ferricyanide having a concentration of 5 mM,and recording an absorption value A2; S8) adding a proton carrier that is [(3-chlorophenyl)hydrazono]malononitrile, and recording an absorption value A3; and S9) adding sodium ferricyanide, and recording an absorption value A4; and S10) calculating the hydrogen pumping capability according to an equation that is (H<+>/e)=x/y=(A1-A2)/(A3-A4). The method is reasonable in design, simple to operate and low in interference by the environment, and a measurement result is good in precision and repeatability. The method is suitable for use in common laboratories.
Owner:LINYI UNIVERSITY

Adhesive special for quick positioning and preparation method thereof

Belonging to the technical field of adhesives, the invention in particular relates to an adhesive special for quick positioning and a preparation method thereof. The adhesive special for quick positioning comprises the following components by weight: 30-50 parts of petroleum resin, 15-25 parts of SBS rubber, 0.5-3 parts of silica, 15-25 parts of n-heptane and 8-12 parts of haloalkane. The adhesivespecial for quick positioning prepared according to the invention has superstrong binding force and viscosity of over 100000, is lasting and firm after curing, has quick positioning effect, can position the vast majority of base material within 10 seconds, can bear load, and also has no need for support and no need for fixation by adhesive tape. With excellent repeated cohesiveness, and for skewbonding, wrong bonding and other errors occurring in the construction process, the adhesive can be subjected to secondary repeated bonding with affecting the final adhesive force. With a long open time up to 40-60min, the adhesive can better solve the large-area construction problem and saves manpower.
Owner:中山市力得化工有限公司

Preparation method of poly(urethane-urea-amide) elastomer powder for selective laser sintering, and product

The invention belongs to the technical field of additive manufacturing, and discloses a poly(urethane-urea-amide) elastomer powder for selective laser sintering, and a preparation method thereof. The elastomer powder is a segmented block copolymer composed of polyamide and polyurethane, and the polyurethane is composed of diisocyanate and polyether and / or polyester. The preparation method comprises the following steps: 1) pre-cooling poly(urethane-urea-amide) elastomer granules by liquid nitrogen, and then crushing the pre-cooled poly(urethane-urea-amide) elastomer granules; 2) screening the powder, wherein the selection range of the particle size of the powder is 0-300 [mu]m; and 3) uniformly mixing the screened poly(urethane-urea-amide) elastomer powder with the flow aid and the antioxidant according to a certain mass ratio to obtain the poly(urethane-urea-amide) elastomer powder for selective laser sintering printing. The product is good in fluidity, wide in printing window, antistatic and excellent in product mechanical property and water resistance. The material can be applied to the fields of aerospace, medical orthopedics, sports equipment and the like.
Owner:ZHENGZHOU UNIV

Thermally reversible crosslinked polyurethane containing dicyclopentadiene crosslinked bridge, preparation method and application thereof

ActiveCN110128618BEnables repeated reprocessingEnables thermoplastic processingPolymer scienceCross linker
The invention provides thermally reversible crosslinked polyurethane containing dicyclopentadiene crosslinking bridged bonds, and a preparation method and applications thereof. Dicyclopentadiene dicarboxylic acid and polyisocyanate (I) carry out reactions to generate a terminal isocyanate component, which contains a dicyclopentadiene structure and is taken as a crosslinking agent, and the terminalisocyanate component and a terminal hydroxyl component carry out reactions to form a crosslinked polyurethane network. By introducing dicyclopentadiene bridged bonds into polyurethane, at a high temperature, bridged bonds are broken; at a low temperature, bridged bonds are formed again; and repeated processing of chemical crosslinking type polyurethane is realized. The primary reverse Diels-Alderreaction temperature of dicyclopentadiene bridged bonds is 170 DEG C; and dicyclopentadiene bridged bonds are introduced into polyurethane to realized thermoplastic processing of crosslinking type polyurethane in a temperature range of 170 to 210 DEG C. The prepared thermally reversible polyurethane has an excellent repeated processing property, and still has good mechanical properties after manytimes of processing and moulding.
Owner:BEIJING UNIV OF CHEM TECH +1
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