19 results about "Polymethacrylic Acids" patented technology

The present application relates to fluorescent nanoparticles based on fluorinated zwitterionic random copolymer and its preparation method and application, the fluorescent nanoparticles include the single chain nanoparticles formed by poly trifluoroethyl methacrylate-co-methacryloyloxyethyl sulfobetaine, the molecular chain end of the poly trifluoroethyl methacrylate-co-methacryloyloxyethyl sulfobetaine is connected with ACQ type group selected from anthryl, perylene imide group and pyrene base or AIE type group selected from tetraphenyl ethylene base, carbazole base and cyanine-containing triphenyl ethylene group.The fluorescent nanoparticles based on the poly trifluoroethyl methacrylate-co-methacryloyloxyethyl sulfobetaine of the present application that terminal fluorescent group is terminated, has excellent controllable fluorescent luminescence performance.It is considered that the single chain nanoparticles have isolation effect, avoid the fluorescence quenching effect of ACQ type group, and can provide limited microenvironment for AIE type group, ensure the fluorescent luminescence performance of nanoparticles.

This invention relates to the field of polylactic acid (PLLA) technology, specifically to a PSMA / PDLA-modified PLLA composite film and its preparation method. The PSMA / PDLA-modified PLLA composite film of this invention comprises a blend of L-polylactic acid (LMA) and a melt blend of octadecyl methacrylate (OMA) and D-polylactic acid (DMA). The OMA / DMA melt blend is obtained by melt blending OMA, DMA, and an initiator. By introducing the OMA / DMA blend, the SMA homopolymer forms a microphase-separated structure with PLLA. The SMA homopolymer forms a soft phase region, improving the toughness of PLLA. Simultaneously, the stereocomplex formed by the PDLA and PLLA molecular chains "anchors" the PLLA matrix to the soft phase of the SMA homopolymer, thereby improving mechanical properties.

This invention belongs to the field of casting binder technology, and particularly relates to an environmentally friendly water glass casting binder with anti-aging function. The raw material composition of this invention includes: sodium water glass, lithium water glass, polymethyl methacrylate, and lithium carbonate, which enables: 1. Polymethyl methacrylate combined with lithium carbonate to provide more hydrogen bonds to the water glass binder system, changing the surface potential energy and solvation ability of the water glass, improving the stability of the water glass, and thus obtaining better "anti-aging" ability; 2. Lithium carbonate itself has the effect of a dispersant, and combined with water glass at a specific modulus, it can further improve the dispersibility of the sand mold; 3. Polymethyl methacrylate itself has basic bonding strength, and by limiting the modulus of the water glass, it can also appropriately improve the bonding strength of the entire binder; 4. The amount of organic polymethyl methacrylate added to this binder is sufficiently small, ensuring that the binder has sufficient safety and environmental protection advantages.

This invention discloses a red pigment paste for color photoresist and its preparation method, relating to the field of photoresist technology. The red pigment paste for photoresist comprises the following materials: modified pigment red 177, propylene glycol methyl ether acetate, poly(methacrylic acid-co-acrylate) copolymer, acrylate resin, styrene-maleic anhydride copolymer, and antioxidant. This invention, by adding modified pigment red 177, works synergistically with the poly(methacrylic acid-co-acrylate) copolymer and polydimethyldiallyl ammonium chloride to inhibit pigment particle agglomeration, ensuring uniform dispersion of the pigment in the propylene glycol methyl ether acetate solvent, thus guaranteeing uniform and fine dispersion of the pigment paste. The antioxidant in this invention includes β-cyclodextrin, which can coat pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and UV-327, improving the compatibility of the pigment paste system and extending the storage life of the pigment paste.

This invention discloses a flexible, low-loss, phase-stable cable and its preparation method, relating to the field of power cable technology. The cable includes a conductor, an insulation layer, an outer conductor, a shielding layer, and an outer sheath. The insulation layer is obtained by wrapping a modified microporous PTFE tape. The modified microporous PTFE tape comprises the following raw materials in parts by weight: 85-95 parts PTFE resin, 65-15 parts PA, 3-6 parts compatibilizer POE-g-SMA, and 2-5 parts modified boron nitride nanosheets. The modified boron nitride nanosheets are doped with fluorine atoms and grafted with poly(trifluoroethyl methacrylate) on their surface. The modified microporous PTFE tape includes modified boron nitride nanosheets and PA6. PA6 is in-situ fiberized to form a three-dimensional fiber skeleton, which can enhance the resistance to deformation, reduce dielectric loss, and significantly enhance the pore structure of the micropores. Introducing the modified microporous PTFE tape into the insulation layer can maintain good flexibility, low loss, and high structural stability.

This flame retardant for plastics comprises any of a thermally depolymerizable polymer to which a water-soluble functional group, e.g., a carboxylic acid group or a sulfonic acid group, has been imparted, an alkali metal salt of the thermally depolymerizable polymer, and an alkaline-earth metal salt of the thermally depolymerizable polymer. Poly(methacrylic acid), for example, is preferred as the thermally depolymerizable polymer having a structure to which a water-soluble functional group has been imparted. Such flame retardant for plastics contains neither a halogen nor nitrogen nor phosphorus in the molecule and can suitably make general-purpose plastics flame-retardant.

The present invention provides a flame-retardant water-based paint composition that can form a coating with good flame retardancy on buildings and building materials. [Solution] The flame-retardant water-based paint composition contains (A) a water-based binder resin and (B) a non-halogen-based water-soluble synthetic polymer flame retardant. As (B) the non-halogen-based water-soluble synthetic polymer flame retardant, a thermally depolymerizable polymer having a structure to which a water-soluble functional group having a specific structure is attached, its alkali metal salt, or its alkaline earth metal salt can be suitably used. In particular, poly(methacrylic acid), its alkali metal salt, or its alkaline earth metal salt can be suitably used.

The application provides a core-shell structure pesticide-loaded nanofiber and a preparation method thereof, and relates to the technical field of pesticides.The application is aimed at solving the problem that the existing pesticide application method not only causes waste of resources, but also causes serious pollution to the environment.The technical points of the application include: preparation of a spinning solution: cellulose acetate and polymethyl methacrylate are dissolved in N,N-dimethylformamide to obtain a mixed solution;pesticides that need to be released slowly are added to the mixed solution to obtain a spinning solution;preparation of the nanofiber: the spinning solution is added to an electrostatic spinning device for electrostatic spinning to obtain the pesticide-loaded nanofiber.The pesticide-loaded nanofiber with the core-shell structure has the following advantages: the cellulose acetate in the interior plays a supporting role;the carboxyl groups of the polymethyl methacrylate in the exterior act as functional groups, which not only enable the pesticides in the core-shell structure to be released slowly, but also enable the carboxyl groups to adsorb heavy metal ions in water.

This invention belongs to the field of medical polymer materials technology, specifically providing a controllable degradable polylactic acid-based composite material for circumcision suture devices and its preparation method. The composite material uses polylactic acid-polycaprolactone block copolymer as the matrix and adds pH-responsive core-shell nano-hydroxyapatite, compatibilizer, and plasticizer. The core-shell nanoparticles are composed of a zinc-silicon co-doped hydroxyapatite core and a poly(dimethylaminoethyl methacrylate) brush shell. In an acidic degradation environment, the brush shell expands to accelerate the release of zinc ions, thereby achieving intelligent antibacterial properties.

FIELD: chemistry; pharmaceuticals.SUBSTANCE: method for producing microcapsules with metronidazole by ionic gelation in combination with electrospray. The proposed method includes: preparing a capsule-forming solution by compounding a metronidazole suspension in vaseline oil, then dissolving sodium alginate and sparsely cross-linked polymethacrylic acid in water, adding Tween-80 to the resulting solution, and then introducing the said metronidazole suspension with constant stirring using a dispersant; preparing a gelling solution by using an aqueous solution of a basic polymethacrylic acid derivative with additionally added metronidazole and calcium chloride; spraying the capsule-forming solution into the gelling solution using an encapsulator; after which the resulting microcapsules are filtered, washed, and dried.EFFECT: reliable encapsulation of water-soluble metronidazole from an oil suspension in an aqueous-salt medium without the use of organic solvents.1 cl, 6 dwg

The present invention relates to a method for producing a graft copolymer containing a polyorganosiloxane, comprising: a step of coating a hard core (A) containing a poly(alkyl (meth)acrylate) with a mixture (b) of polymerization including an organosiloxane monomer (b1), an alkyl (meth)acrylate monomer (b2), and an optional acrylic crosslinking agent (b3), to obtain a composite rubber (B); and a step of graft polymerizing the obtained composite rubber (B) with an alkyl (meth)acrylate (C) to obtain a graft copolymer containing a polyorganosiloxane. The production method according to the present invention can obtain a graft copolymer containing a polyorganosiloxane having a multilayer structure, which can be used as an impact modifier and a color developer, and by adding it to a resin, a resin composition having both excellent impact resistance and color development can be obtained.

The application discloses a kind of polymer brush functionalized liquid metal nanometer lubricating additive and its preparation method and application.The additive includes gallium indium liquid metal nanometer droplet and poly (lauryl methacrylate) -block-poly (acrylic acid) diblock copolymer grafted on its surface by coordination interaction.The preparation method includes: first, poly (lauryl methacrylate) -block-poly (acrylic acid) diblock copolymer is synthesized by atom transfer radical polymerization method;Then gallium indium liquid metal is mixed with the tetrahydrofuran solution of the block copolymer, and polymer brush functionalized liquid metal nanometer droplet is obtained by ultrasonic treatment.The application realizes the effective regulation of liquid metal nanometer droplet size by regulating the composition of block copolymer.The additive has excellent dispersion stability in base oil, and compared with base oil PAO10, the average friction coefficient is reduced by 47.0% at very low additive amount (0.1 wt%), the wear volume is reduced by 82.1%-92.8%, and excellent friction reduction and wear resistance are shown, which can be widely applied to the lubrication system of mechanical equipment.

The present invention relates to a composition comprising: (a) at least one neutralized poly(meth)acrylic polymer; (b) at least one organic acid or salt thereof; and (c) water, wherein the amount of the (a) neutralized poly(meth)acrylic polymer is 0.5% by weight or more, relative to the total weight of the composition. The composition according to the present invention is capable of providing a snowball-like appearance, and undergoing a texture transition (from a gel / cream texture to a liquid texture) during application, and no sticky feeling after application.

This application relates to the field of plastic pipes, and more particularly to a high-temperature resistant and pressure-resistant PE pipe and its preparation method. A high-temperature resistant and pressure-resistant PE pipe is composed of the following components in parts by weight: 75-85 parts polyethylene; 18-22 parts POE-g-MAH composite refined montmorillonite; 0.1-1 parts poly(octadecyl methacrylate) composite titanium dioxide; 0.6-1.2 parts antioxidant; and 0.5-1.5 parts nucleating agent. This application has the effect of improving the high-temperature resistance and pressure resistance of PE pipes.

The invention relates to highly stable emulsion formulations of polyalkyl(meth)acrylate polymers comprising a biosurfactant and a nonionic surfactant. The invention also relates to a method for producing said formulations, compositions thereof and uses as crude oil paraffin inhibitors and pour point depressants.

This invention discloses a sustained-release antibacterial wound dressing and its preparation method, belonging to the field of biomedical materials technology. This invention employs a first and second wall material to double-coat a core material, enabling slow release of the core material. Specifically, grafting dodecylamine with long-chain hydrophobic groups onto polymethacrylic acid via amide bonds prolongs the release of the water-soluble core material. Furthermore, coating the first wall material with the second wall material, wherein polyethyleneimine and carboxymethyl cellulose are cross-linked, reduces the pore size of the second wall material, thereby further prolonging the release of the core material. Therefore, through the synergistic effect of the first and second wall materials, the release of the core material is significantly prolonged. In addition, polyethyleneimine carries a positive charge; due to charge repulsion, the sustained-release particles are uniformly dispersed in the hydrogel matrix, preventing aggregation that could affect the release of the core material. Simultaneously, polyethyleneimine also possesses certain antibacterial properties, which, in synergy with the core material, enhance the antibacterial performance of the wound dressing.

The application provides a moisturizing anti-fouling contact lens and a preparation method thereof, and belongs to the technical field of contact lenses. The application adopts a silicon hydrogel as a substrate, and adopts sulfobetaine, carboxybetaine and polymethyl carboxybetaine to construct a gradient functional layer. Through semi-solidification pre-polymerization, low-temperature impregnation and two-stage photopolymerization, the functional layer is firmly combined with the substrate. The obtained product has high oxygen permeability, excellent moisturizing property and anti-protein contamination capacity, and has stable structure and comfortable wearing, and can effectively solve the problems of easy contamination, poor moisturizing property and easy falling of the functional layer of the traditional contact lens.

The present application relates to a kind of low temperature resistant composite oil phase formula and its preparation process, belong to emulsion explosive technical field, the composite oil phase includes by weight parts: poly-alpha olefin 5070 parts, microcrystalline wax 520 parts, emulsifier 25 parts, microcrystalline wax modifier 13 parts and interface reinforcing agent 0.51 parts, the microcrystalline wax modifier is the polymethyl methacrylic acid high carbon alcohol ester with C12C18 alkyl side chain.The present application is by constructing poly-alpha olefin microcrystalline wax emulsifier interface reinforcing agent microcrystalline wax modifier synergistic system, utilizes the molecular structure similarity of microcrystalline wax modifier and microcrystalline wax, by adsorption and steric hindrance effect, directional regulation microcrystalline wax crystallization morphology in oil phase cooling process, makes it form small dispersed microcrystalline, inhibits the low temperature solidification of oil phase, significantly improves the storage and use reliability of emulsion explosive in extremely cold environment.