686results about How to "Improve hydrolytic stability" patented technology

The present invention relates to composite solid polymer electrolyte membranes (SPEMs) which include a porous polymer substrate interpenetrated with an ion-conducting material. SPEMs of the present invention are useful in electrochemical applications, including fuel cells and electrodialysis.

A thermoplastic composition comprising in combination an aliphatic/aromatic co-polycarbonate component; an impact modifier; and a rigid copolymer, and optionally a polycarbonate component and/or a polycarbonate-polysiloxane copolymer is disclosed. The co-polycarbonate comprises repeating carbonate units and repeating aliphatic units. The compositions have a significantly improved balance of properties, including melt flow and impact.

The invention discloses a dynamic polymer with a dynamic cross-linked structure. Organic boric acid silicon ester bonds are contained on polymer chain skeletons of a cross-linked network and/or on cross-linked link skeletons between polymer chains, wherein the organic boric acid silicon ester bonds are necessary for forming/maintaining a dynamic polymer structure. The dynamic polymer is rich in structure and diverse in properties. By regulating and controlling the structure of a reactant, the dynamic polymers with different properties can be prepared. In addition, due to strong dynamic reversibility of the organic boric acid silicon ester bonds in the polymer, the polymer can exhibit functional characteristics of stimulus responsiveness, self-healing property, recoverability and the like; and besides, due to the presence of the organic boric acid silicon ester bonds, the polymer can also have the energy absorbing effects, and polymer materials can be toughened in a given structure. The dynamic polymer can be used for making shock-absorption cushioning materials, impact-resistance protection materials, self-healing materials, ductile materials and the like.

The invention relates to a temperature and salt resistant copolymer KWKY-PAD for oil field and a preparation method thereof, and mainly solves the problem that polyacrylamide is easy to hydrolyze at high temperature and high salinity in the prior art. The temperature and salt resistant copolymer KWKY-PAD as shown in formula (I) is obtained by the copolymerization of acrylamide and a N-alkyl substituted acrylamide derivative. The technical scheme provided by the invention greatly solves the problem. By the adoption of the preparation method, the hydrolytic stability of the copolymer is raised,and the copolymer has good viscosifying ability and hydrolytic stability at high temperature and high salinity as well as good temperature and salt resistance. The copolymer provided by the inventioncan be used in an oil displacement agent for oil extraction in oil field, and also can be used in oil field application fields of a thickening agent of fracturing fluids, a water plugging profile modification agent, a drilling fluid processing agent and the like. In addition, the preparation method requires less monomer, is simple and is suitable for industrialization.

The invention relates to cationic water-based polyurethane/acrylic ester composite emulsion and the preparation process, belonging to the chemical product and preparation technology field. Raw materials comprise diisocyanate mixture, polyhydric alcohol, organotin catalyst, chain extender, thinner, neutralizing agent and initiating agent. The preparation process comprises adding polyhydric alcohol into a reactor to dehydrate in vacuum, adding into diisocyanate mixture and organotin catalyst, conducting prepolymerization reaction to synthesize prepolymer with isocyanate-termi-nated, coldly adding thinner to dilute and to condense and reflow, adding chain extender to obtain mixture through chain extending reaction, cooling down, adding neutralizing agent to finish salt-forming reaction, regulating pH value, adding deionized water to conduct dispersed emulsification to obtain cationic water-based polyurethane elusion, and heating up and adding initiating agent to initiate free radical polymerization reaction to prepare composite elusion. The cationic water-based polyurethane/acrylic ester composite emulsion is synthesized through adopting non solvent process with low pollution and environment-friendly, increases solvent resistance, water resistance and tensile strength of glue film through introducing micro-cross-linked structure, increases hydrolytic stability of the glue film through introducing carbodiimide structure, and increases elongation at break and elasticity property through of glue film through introducing 2, 4-MDI.

The invention relates to a method for preparing polyol ester lubricating oil by using a composite solid acid catalyst. The method comprises the following steps of: adding a water carrying agent into polyol ester and monobasic fatty acid, performing esterification reaction under the action of the composite solid acid catalyst, and dehydrating and esterfying to obtain raw ester; performing filter pressing on the raw ester to separate the raw ester from the solid acid catalyst, wherein the catalyst can be recycled; and performing reduced pressure distillation on the raw ester to remove the residual fatty acid, and then deacidifying and decolorizing to refine with heating by using a refining adsorption bed layer respectively to obtain low-acid value polyol ester lubricating oil. The method has the advantages that the catalyst can be recycled, the esterification rate is high, an aftertreatment process is simple, and a product is low in acid value, high in purity, environment-friendly and suitable to be produced industrially. The reaction esterification rate can reach over 99 percent, and the acid value of the ester product obtained through refining can be controlled to be less than 0.01mg KOH/g. The product is excellent in visco-temperature performance, high in lubricity and thermal stability, strong in hydrolytic stability, low in volatility and excellent in electrical insulation property.

The invention provides epoxy and oxetane compositions including the novel acyloxy and N-acyl curing agents described herein. Use of invention curing agents result in cured adhesive compositions with remarkably increased adhesion and reduced hydrophilicity when compared to resins cured with other types of curing agents. Furthermore, the curatives of this invention do not interfere with free-radical cure and are thus suited for use in hybrid cure thermoset compositions.

The present disclosure is directed to a reactive ester agent capable of conjugating a reporter molecule to a carrier molecule or solid support. The reactive ester agent has the general formula:

wherein the variables are described throughout the application.

The present invention relates to polycarbonate compositions comprising

• • A) from 10 to 99 parts by weight, in each ease based on the sum of components A+B+C, of aromatic polycarbonate and/or aromatic polyester carbonate,
  • B) from 1 to 35 parts by weight, in each case based on the sum of components A+B+C, of rubber-modified graft polymer of
    • B.1 from 5 to 95 wt. % of at least one vinyl monomer on
    • B.2 from 95 to 5 wt. % of one or more graft bases having a glass transition temperature <10° C.,
  • C) from 0 to 40 parts by weight, in each case based on the sum of components A+B+C, of vinyl (co)polymer and/or polyalkylene terephthalate,
  • D) from 0 to 50 parts by weight, in each case based on the sum of components A+B+C, of phosphorus-containing flameproofing agent,
  • E) from 0 to 1.0 part by weight, in each case based on the sum of components A+B+C, of acidic additives, and
  • F) from 0 to 50 parts by weight, in each case based on the sum of components A+B+C, of additives,
  • wherein component B is obtainable by reacting component B.1 with the graft base B.2 by means of emulsion polymerization, with the proviso that in those compositions that are free of components D) and E), the graft polymer dispersion in the spray drying or in the precipitation has a pH value of less than 7,
  • characterized in that there are used in the graft reaction from 0.1 to 5 parts by weight (based on the sum of the parts by weight of the monomers B.1 and of the graft base B.2 that are used=100 parts by weight) of at least one emulsifier selected from the group consisting of alkali, alkaline earth, ammonium and phosphonium salts of a saturated fatty acid having from 10 to 50 carbon atoms, wherein the emulsifier or emulsifiers remains or remain in component B,

and also to a process for the preparation of these polycarbonate compositions and to the use of the polycarbonate compositions in the production of molded bodies, and to the molded bodies themselves.

The invention relates to a graphene-containing lubricating oil and a preparation method thereof. The graphene-containing lubricating oil comprises the following components by weight: 0.1-1 part of graphene, 72-85 parts of synthetic base oil, 0.8-3.2 parts of a composite antioxidant, 0.5-1.5 parts of a metal detergent, 2.3-6.5 parts of an ashless dispersant, 0.05-1.5 parts of a nanoscale friction modifier, 2.0-10.0 parts of a viscosity index improver, 0.2-1.0 part of a pour point reducer, and 50ppm of a defoamer. The preparation method includes: putting the synthetic base oil into a blending kettle, performing stirring, then adding the pour point reducer, the viscosity index improver, the composite antioxidant, the metal detergent, the ashless dispersant, and the nanoscale friction modifier, stirring the substances evenly, adding graphene and the defoamer, maintaining the original temperature, stirring the materials evenly, and performing standing. The graphene-containing lubricating oil provided by the invention solves the problems of corrosion and selectivity in traditional lubricating oil additives, at the same time the process is improved, and the ultrasonic dispersion link of graphene is eliminated.

Compositions comprise phase separated polyetherimide/polyphenylene ether sulfone blends. The dispersed phase has an average cross sectional size of 0.1 to 10 micrometers. The composition retains has good hydrolytic stability and is capable of withstanding steam autoclaving at temperatures of 130 to 138° C.

The invention concerns a polyurethane elastomer containing structural units of type (a), in which: the group -O-R1-O-is a macrodiol group with a molecular weight of approximately 500 to 10000, R2 is a bivalent aliphatic, cycloaliphatic and/or aliphatic-cycloaliphatic group; and X is a short-chain olefinically unsaturated group, Y is NH or O, n is an integer from 1 to 10 and m is an integer of at least 4. The invention also concerns a method of preparing this polyurethane elastomer which can be melt-spun to form fibres or melt-extruded to form foils. The fibres or foils can be exposed to energy-rich radiation such that crosslinking of the polyurethane occurs. Fibres according to the invention display superior properties in terms of textile-mechanical properties, in particular good tensile strength, elongation at tear, residual elongation and heat distortion temperature.