91results about How to "Aggregation is stable" patented technology

The invention discloses a preparation method and an application of an acrylate heterozygotic emulsion. In the invention, the acrylate heterozygotic emulsion is synthesized by adopting a seed emulsion polymerization process and combining a process of instantly neutralizing and segmentally adding polar monomers. The acrylate heterozygotic emulsion comprises macroparticles consisting of polymers P2 rich in hydroxyl groups on a surface layer and microparticles consisting of polymers P1 rich in carboxylate on the surface layer. Compared with a conventional hydroxy acrylate emulsion, the acrylate heterozygotic emulsion has smaller mean grain size and wider grain size distribution on emulsion particles. The acrylate heterozygotic emulsion can be adopted to prepare aqueous bi-component polyurethane wood coatings, and a coating layer of the coating has excellent property of resisting water and solvents, high crosslinking density and hardness, good mechanical property, scratching resistance and wear resistance. The acrylate heterozygotic emulsion has compact coating structure, high glossiness and better combination property, and not only can be applied to high-grade wood coatings, but also can be applied to automotive refinish paint, metallic anti-corrosion paint, other industrial protective paint, and the like.

There is provided a method for producing pigment crystals with sufficiently high purity and sufficiently controlled crystal type, particle size, and aggregation property and dispersibility to obtain a pigment crystal that can be suitably used in both a solid phase and a liquid phase. The method for producing pigment crystals (S₃) from a pigment precursor (S₀) using retro Diels-Alder reaction, the method comprising producing the pigment crystals (S₃) from the pigment precursor (S₀) through a first displacement structure (S₁) and a second displacement structure (S₂), which differ from the pigment precursor (S₀) and the pigment crystals (S₃) and also differ from at least from each other.

The invention provides a method for preparing high-solid-content and low-viscosity core-shell structure styrene-acrylic emulsion, which comprises the following steps: firstly, preparing copolymer seed emulsion in binary particle-size distribution of styrene (St) and butyl acrylate (BA); and then, dripping mixed monomers composed of styrene (St) or butyl acrylate (BA) and acrylic acid (AA) on the basis of the semi-continuous feeding process, wherein anionic emulsion and nonionic emulsion constitute a compound emulsification system in the presence of water-soluble initiator and sodium hydrogen carbonate as buffering agent. By controlling the proportion and dripping rate of the compound emulsion in different stages and adjusting the surface coverage of latex particle emulsifier, the method of the invention is capable of preparing high-solid-content and low-viscosity stable core-shell-type poly(butyl acrylate/styrene/acrylic acid)/poly(styrene/acrylic acid) [P(BA/St/AA)/P(St/AA)] emulsion. The product is widely applicable in coatings and adhesives.

A preparing method of a modified acrylate emulsion is disclosed. The modified acrylate emulsion is prepared by subjecting acrylate, methacrylate, vinyl acetate, acrylonitrile, acrylic acid, an organosilicone modified monomer, a crosslinking monomer, a surface active monomer, and the like to emulsion polymerization. The organosilicone modified monomer is linear organopolysiloxane containing alkenyl bonding to silicon. Polymerization is performed after the surface active monomer, the acrylate and/or the methacrylate are adopted to prepare a seed emulsion, thus reducing the using amount of an emulsifying agent, making polymerization stable and making the gel rate low.

The preparation process of emulsive interpenetrating thermoplastic elastomer includes synthesis of slightly cross-linked rubber elastomer seed emulsion, synthesis of interpenetrating emulsion, agglomeration, drying and mixing pelletizing. The synthesis of rubber elastomer seed emulsion includes two steps. Cross-linking vinyl monomer with certain bifunctional degree and multifunctional degree is mixed into the seed emulsion monomer and the consumption of cross-linking agent is controlled to obtain rubber elastomer seed emulsion with controlled and low cross-linking degree. Into the seed emulsion, thermoplastic vinyl monomer with mixed acrylonitrile is dropped while adding certain amount of emulsifier, and through swelling, initiating polymerization and other courses, the emulsive interpenetrating polymer with proper cross-linking degree is obtained, which is further processed into emulsive interpenetrating thermoplastic elastomer agglomerate.

The invention is directed to an electrophotographic photoreceptor, and an electrophotographic cartridge and an electrophotographic imaging apparatus including the electrophotographic photoreceptor. The electrophotographic photoreceptor includes: an electrically conductive substrate; a charge generating layer formed on the electrically conductive substrate and comprising μ-oxo-gallium phthalocyanine dimer as a charge generating material dispersed in a binder resin; and a charge transporting layer formed on the charge generating layer. The charge transporting layer includes a charge transporting material and a binder resin. The charge transporting material is a combination of (1) a butadiene-based amine compound and a hydrazone compound and (2) a combination of a first benzidine compound and a second benzidine compound. The amount of the charge transporting material is 5-200 parts by weight based on 100 parts by weight of the binder resin of the charge transporting layer. The electrophotographic photoreceptor has an excellent electrostatic property and a high interlayer adhesive force and resistance to abrasion and can be manufactured at a low cost.

The invention provides an epoxy organosiloxane modified acrylic emulsion and a preparation method thereof. The emulsion is specifically obtained by performing emulsion polymerization on an acrylic monomer, a single-end epoxy polysiloxane, an initiator, an emulsifier, a pH buffering agent and deionized water, wherein epoxy organosiloxane is a linear organopolysiloxane having an epoxy group bonded to silicon at one end. The invention further provides the preparation method of the modified acrylate emulsion; and the method comprises the steps of dissolving the single-end epoxy polysiloxane by using the acrylic monomer, preparing a pre-emulsion by emulsification, preparing a seed emulsion from acrylate and/or methacrylate and the emulsifier, and adding the pre-emulsion dropwise into the seed emulsion to complete the polymerization reaction. According to the method provided by the invention, the emulsion obtained by the method has good adhesion, surface hand feel, water resistance and stainresistance.

The invention discloses a method for preparing graphene flame-retardant nylon fiber, which belongs to the field of flame-retardant fiber preparation, and comprises the following steps: uniformly mixing graphene, flame retardant, titanium dioxide and dispersant, and placing ultrasonic cell pulverization after mixing Disperse evenly in the instrument; add the polyamide fiber monomer to the graphene suspension as a catalyst for in-situ polymerization, and dry in an oven at 60-80°C to obtain a composite material; the composite material is extruded by twin-screw, granulated, Spinning to prepare graphene flame-retardant nylon fiber. The beneficial effects of the present invention are: the flame-retardant nylon fiber obtained by the method of in-situ polymerization has the dual advantages of flame-retardant and antistatic, has excellent elongation at break, and graphene has a high specific surface area and sp2 hybrid structure. On the one hand, the inorganic flame retardant is evenly spread on the graphene surface instead of disorderly stacking; on the other hand, graphene forms an effective bonding force between the flame retardant and the nylon monomer, which enhances the mechanical strength of the fiber.

The invention relates to a rapid cultivating method for a high-yield and high-quality multiple resistant rice restorer. The method comprises the steps of selecting eight rice species having the characters of high yield, high quality, insect resistance and disease resistance as parents, hybridizing every two parents with different target characters to obtain four first-filial generations F1; hybridizing every two of the four F1 to obtain two composite cross generations F1; performing molecular marker-assisted selection on the two composite cross generations F1 single plants in a seedling stage, screening two composite cross generations F1 integrating target genes, carrying out matched hybrid to obtain multiple composite cross generations F1; performing molecular marker-assisted selection on the multiple composite cross generations F1 single plants in a seedling stage to obtain a single plant integrating all target genes, carrying out anther culture to obtain H0 generation anther-culture lines, screening diploid lines; performing molecular marker-assisted selection, agronomic characters, quality and resistance screening on H1 generations to obtain a target high-yield and high-quality multiple resistant rice restorer, carrying out combined test with a series of two-line sterile lines, and screening out advantageous combination.

The invention relates to a polyacrylic imide foam material prepared by an esterquat precursor, and a preparation method and application of the polyacrylic imide foam material. In a preparation process of polyacrylic imide foam prepolymer, the esterquat precursor of PMR type polyimide is added, endothermic reaction of amidation of the esterquat precursor is matched with exothermic reaction of free radical polymerization in the preparation process of the polyacrylic imide foam prepolymer, and the purpose of effectively controlling reaction speed of polyacrylic imide is achieved. The prepared polyacrylic imide foam material has the advantages of high closed porosity, good high-temperature resistance and high compression resistance. The density of prepared foam is 30-250kg/m (3), closed porosity is greater than 90%, and a glass transition temperature is greater than 220 DEG C. At a room temperature, the density of the prepared foam is greater than 110kg/m (3), and compression strength of the foam is greater than 3.0MPa; and at a high temperature of 180 DEG C and under pressure of 0.3MPa, the compression deformation rate of the foam of which the density is 110kg/m (3) is lower than 1% after the foam is technologically treated for 2 hours.

The invention discloses an injectable water-absorbing and swelling bone cement, which comprises the following raw materials in percentage by weight: 0.002%-0.09% of methyl methacrylate monomers, 0.001%-0.0018% of N,N-Dimethyl-p-toluidine, 0.0015%-0.0045% of hydroquinone, 0.705%-66.6023% of methyl methacrylate-styrene copolymer, 0.12%-14.4014% of polymethyl methacrylate, 0.05%-9% of barium sulfate, 9.9%-90.1205% of water-absorbing resin fibers. The invention further provides a preparation method of the bone cement, and the preparation method specifically comprises the following step: mixing the prepared water-absorbing resin fibers with the injectable bone cement precursor to obtain injectable water-absorbing and swelling bone cement. The water-absorbing resin fibers in the injectable water-absorbing and swelling bone cement are increased in volume after absorbing water, the elastic modulus of the bone cement can be reduced, the volume contraction of PMMA bone cement in self polymerization can be offset, and the bone and prosthesis are firmly bonded.

The invention belongs to the technical field of polymer membrane materials, and discloses a polysulfone chiral-separation membrane grafted by cyclodextrin through an SI-ATRP method, and a making method and an application thereof. The method includes the following concrete steps: adding a chloromethylpolysulfone membrane, allyl-beta-cyclodextrin and a catalyst into a solvent, sealing, adding a ligand, heating for reacting, washing, and drying to obtain the polysulfone chiral-separation membrane grafted by cyclodextrin through an SI-ATRP method. Chiral recognition sites are introduced into the surface of the membrane and the inner walls of apertures of the membrane through the surface-initiated atom transfer radical polymerization (SI-ATRP) method on the premise that the matrix membrane structure is not destroyed and the use performances of the membrane are not influenced, and the combination between the chiral sites and the membrane matrix are firm; and the grafting density, the length of a graft polymer and the chemical composition of the surface of the membrane can be effectively controlled by adopting a polymerization technology. The Polysulfone chiral-separation membrane grafted by cyclodextrin through the SI-ATRP method can be used in the separation of racemes.

Foamable polystyrene and a preparing method thereof are disclosed. The weight of graphene in the foamable polystyrene is 0.2-1 wt% of the total weight of a styrene monomer before polymerization. The foamable polystyrene prepared can be subjected to plate pressing and molding to obtain a foam plate. The flame retardance grade of the foam plate can be the B1 grade, the heat conductivity decreases from original 0.039-0.042 W/(m.K) to 0.030-0.034 W/(m.K), and the drawing performance increases from original 90 KPa to 260 KPa.

The invention discloses a preparation method of a polytetrafluoroethylene/polyacrylate core-shell emulsion for a pressure-sensitive adhesive. The preparation method comprises the following steps: a, preparing a seed preemulsion; b, preparing a shell-layer monomer preemulsion; c, preparing the core-shell emulsion. By the preparation method, with a polytetrafluoroethylene emulsion as a seed and a copolymer of acrylic monomers as a shell, a composite modified emulsion adopting a core-shell structure is prepared, and the external seed polytetrafluoroethylene is creatively introduced. Through control of the addition amount of the PTFE seed in the seed stage and the using amount of a shell-layer crosslinking agent, the pressure-sensitive property of the pressure-sensitive adhesive is controlled.By the preparation method, the controllability of morphologies, compositions and structures of latex particles is achieved, the experimental operation is simple, and environment pollution is avoided.

The invention discloses an acrylate emulsion for a waterborne multicolor paint and a production process of the acrylate emulsion. The acrylate emulsion as the main raw material of the waterborne multicolor paint is prepared from the components including water, an emulsifier, an initiator solution I, an initiator solution II and monomers according to the steps of sequentially preparation of the initiators, preparation of emulsifier, preparation of core liquid, preparation of shell liquid, posttreatment and filtering, wherein the monomers comprise methyl methacrylate, butyl acrylate, methacrylic acid, hydroxyethyl methacrylate and polymerizable organosilicon monomers. The water resistance of the waterborne multicolor paint prepared from the acrylate emulsion prepared according to the production process is greatly improved, and therefore the service life of wall surface paints under moist environments is greatly improved; meanwhile, the paint has good performance and relatively high practical effect, and meets the basic requirements of brushing wall surface paints.

The invention relates to the technical field of aqueous adhesives, and more particularly relates to an aqueous adhesive for compounding aluminium foils with extruded polystyrene (XPS) boards and a preparation method thereof. The formulation of the aqueous adhesive comprises 77-110 parts of deionized water, 0.4-1.5 parts of a phosphate emulsifier, 50-60 parts of an acrylics monomer mixture, 5-12 parts of reactive phosphate functional monomer, 0.2-0.8 parts of an initiator, 0.05-0.15 parts of a thickener, 0.05-0.2 parts of a defoamer and 0.02-0.05 parts of a wetting agent, which are polymerizedby a special process for preparing the aqueous adhesive. The aqueous adhesive prepared by the invention has strong adhesion on the aluminium foils and greatly improves the bonding strength with base materials. After applied to the compounding adhesion between the aluminium foils and the XPS boards and further dried and cured for 24 hours, the aqueous adhesive enables the XPS board to be soaked inboiled water for 1 hour without no damage to the bonding layer.

The invention discloses a method for preparing low molecular weight distribution polyether. The low molecular weight distribution polyether is prepared from the following raw materials: 8-10 parts of low molecular weight distribution polyether, Propylene oxide, lithium carbonate and 0.005% of a DMC catalyst. The method comprises the following steps: feeding the low molecular weight distribution polyether and the lithium carbonate into a reactor, dehydrating with nitrogen at 115-120 DEG C, after the moisture is qualified, adding the DMC catalyst, introducing epoxypropane, after epoxypropane is added, stirring for 1-3 hours to enable the system to react sufficiently, vacuuming, and cooling, thereby preparing the low molecular weight distribution polyether. By adopting the method, the use amount of the catalyst is small, the monomer conversion rate is high, and polymerization can be relatively stable.