176 results about "Polystyrene bead" patented technology

Plastic beads, including polyamides and polystyrene beads crosslinked with divinylbenzene, having a curable resin coating are highly useful for sand control and / or hydraulic fracturing of subterranean. The curable resin coated plastic beads preferably have an apparent specific gravity less than about 1.5.

The invention relates to a lost-foam casting method for a water pump thin-wall part, which belongs to the technical field of lost-foam casting. The invention provides the lost-foam casting method for the water pump thin-wall part with high casting precision and stable quality. The invention adopts a technical scheme that the lost-foam coasting method for the water pump thin-wall part comprises the steps of beads foaming, molding, hanging paint, drying and casting, wherein GP-4S standard level polystyrene beads are selected to be added in a foaming tank to be prefoamed, and the foamed beads are added into a mould preheated to 90 to 110 DEG C to be molded; secondly, the white mould is fully cured, dip-coated for three times and assembled into a cluster to be dried; and finally, casting is performed. The method is applied to the casting technology of water pump thin-wall parts.

The invention discloses polystyrene / thermosetting resin syntactic foam and a method for preparing the same, and belongs to the field of flame retardant materials. The formula of the syntactic foam comprises expandable polystyrene, resin monomers or prepolymers and a curing agent. The invention also discloses a method for preparing the syntactic foam. The preparation method comprises the following steps of: pre-foaming the expandable polystyrene particles to obtain polystyrene beads; and uniformly coating the polystyrene beads with the curing agent-contained resin monomers or prepolymers, and curing the polystyrene beads to obtain the syntactic foam. The syntactic foam can fundamentally solve the problem that the polystyrene is combusted and drips, has a high flame retardant property, and is low in cost and excellent in performance, so that the syntactic foam becomes a new selection for exterior wall heat-insulating materials.

A lightweight concrete panel for use as an outer layer of a dwelling wall, said panel made of concrete mix of cement, sand, lightweight concrete aggregate such as polystyrene beads, superplasticiser and water, said concrete mix having a nominal density in the range of 500 to 1500 kg / m3. The panel preferably has a backing sheet of polystyrene affixed thereto. The panel is used as in a cladding and insulating veneer arrangement for a load bearing subwall formed from studs or masonry. The panels are loose fixed in vertical alignment in a horizontally and vertically extending stack of panels and retained in position by retaining clips without any bonding jointing material between the panels. A method of forming such a cladding and insulating arrangement is also disclosed.

The invention relates to a method for preparing a TiO2 / PS / Fe3O4 magnetic nanoparticle photocatalyst, comprising the following steps of: (1) preparing oleic acid modified Fe3O4 nanoparticles; (2) preparing an aqueous-phase magnetic fluid; (3) preparing styrene miniemulsion; (4) preparing magnetic polystyrene beads PS / Fe3O; and (5) preparing the magnetic photocatalyst TiO2 / PS / Fe3O4, which specifically comprises the following steps of: mixing absolute ethyl alcohol with tetra-n-butyl titanate, and performing magnetic stirring to form a solution A; adding the magnetic polystyrene beads PS / Fe3O to de-ionized water and performing ultrasonic treatment to form a solution B; under magnetic stirring, adding the solution A to the solution B, thereby obtaining sol after 30-40 min, wherein TiO2 covers the PS / Fe3O at the moment; after condensing and refluxing the sol in a water bath, filtering the sol to obtain the TiO2 / PS / Fe3O4, washing the TiO2 / PS / Fe3O4 by using ethanol, filtering, washing by using distilled water and filtering, thus obtaining a solid; and drying the solid until the weight thereof is constant, thereby obtaining the magnetic photocatalyst TiO2 / PS / Fe3O4 with the polystyrene PS as an isolating layer, the Fe3O4 as a magnetic core and the TiO2 as a shell. The product obtained by using the method is low in energy consumption, high in catalytic activity and recyclable.

Disclosed is the preparation of a molecularly imprinted polymer for the selective separation of heavy metal ions using a core-shell polymerization method. According to the core-shell polymerization method, the molecularly imprinted polymer is prepared through two steps of preparing seed particles using styrene and divinylbenzene and forming a metal ion imprinted polymer on the surface of the seed particles. In the imprinted polymer thus prepared, an imprinted site is present on the surface of a support (e.g., polystyrene beads), thus reducing the time required to recognize heavy metal ions and obviating the use of a surfactant or a stabilizer, thereby realizing economic and environmental advantages.

The invention provides a production method of a polystyrene insulation board. The production method comprises the following steps: (1) pre-foaming expandable polystyrene particles so as to obtain polystyrene beads; (2) uniformly stirring a foaming agent, a curing agent and a surface active agent so as to prepare a liquid additive; (3) adding thermosetting resin and the liquid additive to the polystyrene beads, and uniformly stirring; (4) adding a flame retardant to the obtained mixture, and uniformly mixing; and (4) transferring the obtained material to a mold, and molding under a steam pressure. The production method provided by the invention is simple in process and is capable of improving the compression strength, pull strength and fireproof performance of the product.

The present invention includes composition and methods for making and using a combinatorial library having two or more beads, wherein attached to each bead is a unique nucleic acid aptamer that have disposed thereon a unique sequence. The library aptamers may be attached covalently to the one or more beads, which may be polystyrene beads. The aptamers may include phosphorothioate, phosphorodithioate and / or methylphosphonate linkages and may be single or double stranded DNA, RNA or even PNAs.

The invention relates to expandable polystyrene beads prepared from expandable few-layer graphene and a preparing method of the expandable polystyrene beads.Electrochemical intercalation is carried out on natural flake graphite with concentrated sulfuric acid, and a graphite interlayer compound with the interlayer space enlarged is obtained; few-layer graphene is obtained through ultrasonic concussion layer removing, the few-layer graphene is subjected to secondary intercalation with a chemical method, water washing and drying, and the expandable few-layer graphene is obtained; then, the expandable few-layer graphene and polystyrene monomers are subjected to suspension polymerization, and the expandable polystyrene beads prepared from the expandable few-layer graphene is obtained.According to the expandable polystyrene beads prepared from the expandable few-layer graphene and the preparing method of the expandable polystyrene beads, the expandable few-layer graphene is introduced into expandable polystyrene, and expandable graphene can be highly and uniformly dispersed in the expandable polystyrene beads, so that high infrared reflectivity in a cavity of expandable polystyrene is ensured, the heat insulation performance is good, and the expandable few-layer graphene can show the flame-retardant effects of smothering flames and insulating heat radiation.The flame retardant grade of a foam plate prepared from the expandable polystyrene beads reaches the B1 grade, and the heat conductivity value ranges from 0.028 W / (m.K) to 0.032 W / (m.K).

The invention belongs to the technical field of macromolecular materials and discloses a macromolecular composite foam material as well as a preparation method and application thereof. The material is formed by the following components in parts by weight: 50-500 parts of polystyrene bead, 500-950 parts of melamine formaldehyde resin, 100-200 parts of a foaming agent, 100-200 parts of a curing agent, 0-200 parts of a surface active agent, 0-150 parts of a flexibilizer and 0-200 parts of an additive. The preparation method comprises the following steps of: stirring 50-500 parts of polystyrene bead, 500-950 parts of melamine formaldehyde resin, 100-200 parts of foaming agent, 0-200 parts of surface active agent, 0-150 parts of flexibilizer and 0-200 parts of additive for 4-6 minutes, preheating the components for 5-10 min so that the temperature of a mixture is 30-40 DEG C, then adding 100-200 parts of curing agent, stirring for 1-2 minutes, pouring a second mixture into a preheated die for foaming and curing for 2-3 hours, thereby obtaining the macromolecular composite foam material. The invention also discloses application of the macromolecular composite foam material in serving as an insulation plate. The macromolecular composite foam material provided by the invention has high anti-flaming property and a good sound isolation effect.

An expandable polystyrene bead production method, which is a two-step process, is disclosed. The method includes obtaining suspendable, homogenous micropellets from a mixed composition prepared by mixing graphite particles with a styrene-based resin and extruding the composition, and carrying out seed polymerization by suspending graphite-containing micropellets in water and adding a styrene-based monomer and an aromatic hydrocarbon having 6 to 10 carbon atoms, and impregnation by adding a blowing agent. The produced expandable polystyrene beads, which contain graphite particles, are considerably low in thermal conductivity. In addition, the expandable polystyrene beads exhibit a little change in the thermal conductivity over time due to the use of the graphite particles, so that the heat insulation property can be sustained for an extended period of time.

Partially expanded closed-cell unmatured polystyrene bead with a partial vacuum within the cells inside the bead, which may be coated with an air impervious coating to retain a partial vacuum inside cells for a prolonged period of time. The resulting bead has improved thermal insulating properties and may be used for insulation.

The invention discloses a method and device for detecting indoor heavy metal pollution by single-particle aerosol mass spectrometry. The method is as follows: firstly, a polystyrene ball is used to perform a particle size calibration experiment on the instrument, and then a standard solution of known metal ions is used Carry out the mass number correction experiment. After the calibration is completed, use SPAMS to collect indoor atmospheric aerosols in different areas and heights in real time, and then use SPAMS to analyze and collect various parameters and status information of heavy metal particles in the samples in real time. The SPAMS in the device includes a sequentially connected sampling module, a particle size measurement module, an ionization source module, a mass analyzer module, a data acquisition module and a data analysis module. The invention can quickly, sensitively, accurately and real-time online detect the particle number concentration, particle size distribution, mass spectrum characteristics, mixing state, etc. of indoor heavy metal particles, and judge its possible source.

Expanded polystyrene particles having a polyvinyl acetate resin-based functional skin layer, and a process thereof are provided. The particle includes an inner expanded polystyrene layer; and a functional skin layer. The inner expanded polystyrene layer is formed by heating and expanding an expandable polystyrene bead or pellet, and the functional skin layer is formed by coating the surface of the inner expanded polystyrene layer with a functional coating composition having 10 to 99 wt % of a vinyl acetate based polymer and 0.1 to 90 wt % of at least one functional additive.

Disclosed herein is an expandable polystyrene bead having improved adiabaticity and flame- retardance and a method of producing the expandable polystyrene bead. The expandable polystyrene bead comprises 10 - 60 wt% of a flame retardant which is made of one or more selected from among metal or nonmetal oxides, metal or nonmetal hydroxides, silicates, borates and carbonates, having a particle size of 1-50[mu]m. Expanded polystyrene foam having improved adiabaticity and flame-retardance can be obtained using the expandable polystyrene bead. A thin flame-retardant thermal insulator including the expanded polystyrene foam can be widely used in various fire-related fields.

The invention discloses a production method of expanded polyethylene / polystyrene beads. The production method is characterized by comprising the following steps: (1) uniformly mixing polyethylene resin, polystyrene resin, a compatilizer, a crystallization nucleation adjuvant and other processing adjuvants, and carrying out mixing, extrusion, drawing and granulation through an extruder to prepare modified polyethylene / polystyrene particles; and (2) feeding the modified polyethylene / polystyrene particles into a reaction kettle, injecting supercritical CO2, segmentally pressurizing step by step under heating to enable gas to fully penetrate into the modified polyethylene / polystyrene resin, generating internal pressure for outward expansion, and then instantly releasing the pressure to be equal to the atmospheric pressure after certain time to obtain the expanded polyethylene / polystyrene beads with a certain ratio. The production method overcomes the shortcomings of low bonding strength among the EPS beads and low rigidity of EPE. Meanwhile, the foaming process is low in production cost, high in production efficiency and favorable for implementing industrialization, and can be widely applied to the fields of automotive interior trim parts, packaging materials, building materials, heat isolation materials and the like.

A process including topically applying a finely divided powder onto a plurality of polystyrene beads. The finely divided powder includes brominated compounds including a brominated alkane having at least one substituent aromatic group. The polystyrene beads are pre-expanded with the topically applied brominated compounds and a molded pattern is formed from the pre-expanded polystyrene beads. A lost foam casting mold is formed with the molded pattern. Molten metal is poured into the lost foam casting mold and onto the molded pattern to depolymerize the polystyrene beads with the topically applied brominated compounds.

A lightweight structural concrete with screw-ability and nail-ability similar to wood is composed of a non-structural and ultra lightweight aggregate such as expanded perlite or a combination of expanded perlite and polystyrene beads of a particular size distribution and volume amount, entrained air cells of another specific size distribution and volume amount, and dense cementitious composition of a cement binder, a fine grade structural filler no larger than concrete sand grade, a pozzolan, and optional micro-fibers for reinforcement. This structural concrete matrix is optimized to hold 13 gauge T-nails and bugle head wood screws with thread ranging from 8 to 11 threads per inch and diameter of 0.10″ to 0.137″. The resulting concrete will have consistent screw-ability and nail-ability similar to that of wood.

Method for preparing biocidal halogenated polystyrene hydantoins. The biocidal polymers poly-1,3-dichloro-5-methyl-5-(4′-vinylphenyl)hydantoin, poly-1,3-dibromo-5-methyl-5-(4′-vinylphenyl)hydantoin, and their monohalogenated alkali metal salts and protonated derivatives have been prepared as porous beads by use of highly crosslinked polystyrene beads as starting materials. The porous beads will be useful in water and air disinfection applications when employed in cartridge filters and carafes (for water), as well as for controlling noxious odor when mixed with absorbent materials in items such as disposable diapers, incontinence pads, bandages, sanitary napkins, pantiliners, mattress covers, shoe inserts, sponges, animal litter, carpets, fabrics, and air filters or the like.

Methylated polystyrene having pendant N-halamine and N-halamine precursor groups. Biocidal particles have been prepared by reacting highly crosslinked methylated polystyrene beads as starting materials with various N-halamine precursor compounds. The resulting polymer beads are halogenated with chlorine or bromine. The porous beads will be useful in disinfection applications as well as for sanitization and controlling noxious odor when mixed with absorbent materials in items such as disposable diapers, infant swimwear, incontinence pads, bandages, sanitary napkins, pantiliners, mattress covers, shoe inserts, sponges, animal litter, carpets, and fabrics.

The invention relates to an inorganic powder modification process for expandable polystyrene particles and components of the expandable polystyrene particles. The expandable polystyrene particles comprise not more than 10 mass percent of inorganic powder as flame-retardant enhancing materials, wherein the inorganic powder materials mainly comprise natural mineral powder, and can be added into a system before, during or after the polymerization reaction of polystyrene. Due to the special physical and chemical properties of the inorganic powder or under the coaction of the inorganic powder and other flame retardants, the obtained expandable polystyrene is endowed with high flame retardant and heat insulating properties.

The invention relates to a sound absorption plate with fireproof and heat insulation functions, which is characterized by comprising the following ingredients in parts by weight: 30 to 50 parts of expanded perlite, 20 to 30 parts of polystyrene pearl particles, 30 to 50 parts of water glass, 5 to 10 parts of glass fiber, 5 to 10 parts of zinc borate and 10 to 20 parts of lime powder. The sound absorption plate is prepared through procedures of ball milling, stirring, pressing and the like. The sound absorption plate has the advantages of heat insulation, thermal isolation, fireproof and waterproof effects, sound absorption, heat insulation, low cost and attractive appearance and is convenient to install.

The invention discloses a production method and production equipment of a fireproof polystyrene board. The production method comprises the following steps: pouring or spraying a liquid fire retardant on the upper surface of a polystyrene board, vacuumizing the polystyrene board on the lower surface of the polystyrene board to ensure that the liquid fire retardant flows through pores inside the whole polystyrene board from top to inside under the actions of gravity and a pressure difference so as to wrap the surfaces of polystyrene beads; and then drying to ensure that the fire retardant is cured. The production equipment comprises a conveyor line for conveying the polystyrene board, and a fire retardant container, wherein a fire retardant spreader is arranged above a permeating section of the conveyor line, the fire retardant spreader is communicated with the fire retardant container through a pipeline as well as a control valve and / or pump. The production equipment further comprises a vacuum pump, wherein the vacuum pump is connected with a gas phase outlet of a gas-liquid separator, an inlet of the gas-liquid separator is communicated with a gas collector by virtue of a pipeline, a gas inlet of the gas collector is formed in a position of a conveying surface of the permeating section of the conveyor line and faces upwards; on a curing section of the conveyor line, the conveyor line penetrates through a curing furnace. According to the invention, the production efficiency is high and the product quality is good; the fireproof performance can reach an A2 level.

The invention provides a fireproof polystyrene heat preservation plate and a preparing method thereof. The fireproof polystyrene heat preservation plate is prepared from polystyrene particles coated with a fire retardant, and the fire retardant is prepared from urea resin, alkyd resin, aluminium hydroxide, ammonium polyphosphate, pentaerythritol, assistant, antifoaming agent and pigment. According to the fireproof polystyrene heat preservation plate and the preparing method thereof, the fireproof-isolation-cabin isolating theory is adopted, when the heat preservation plate is burned, the fire retardant on surface layers of beads form a compact carbon layer, it can be effectively prevented that polystyrene beads inside the heat preservation plate are burned through flames, and therefore the burning performance level of the heat preservation plate reaches the A2 level.

The invention belongs to the field of high-value recycling of waste polystyrene foam materials, and particularly relates to a water-phase suspension granulation method for preparing gradient flame-retardant foamable polystyrene beads on the basis of waste polystyrene materials and products of the water-phase suspension granulation method. The water-phase suspension granulation method includes forming oil phases by inorganic-organic gradient cooperative flame-retardant heat-insulation systems, organic solvents and the waste polystyrene materials; forming water-phase dispersion media by surfactants, inorganic-organic synergistic suspension agents and deionized water; stably suspending and dispersing oil-phase liquid drop in the water-phase media under the actions of mechanical stirring by means of water-phase suspension granulation; heating and steaming out the organic solvents to cure gradient flame-retardant polystyrene beads; acquiring gradient flame-retardant polystyrene heat-insulation plates by means of pentane filling and foaming molding. The waster-phase suspension granulation method and the products have the advantages that waste polystyrene is used as a raw material, is recycled by the aid of physical processes and is used for preparing the gradient flame-retardant foamable polystyrene beads, accordingly, waste can be utilized, and the gradient flame-retardant performance and heat-insulation effects of the gradient flame-retardant foamable polystyrene beads can be improved; the organic solvents can be recycled, accordingly, the water-phase suspension granulation method and the products are environmental friendly, and industrial production can be facilitated.

The invention relates to a preparation method of pyridine chelate resin, belonging to the technical field of resins. The present invention uses macroporous chloromethylated polystyrene beads (chlorine balls) as matrix resin, and prepares a kind of chela with sulfide molecular chain as cantilever and aminopyridine as functional group according to the principle of macromolecular chemical reaction. synthetic resin. It has good selective chelating properties for Hg2+, Pd2+, Au3+, Cu2+, Pd2+ and other metal ions, and has the advantages of fast chelating rate, large chelating amount, easy desorption, regeneration and repeated use. Filling the chelating resin prepared by the invention into the chromatographic column can realize the automatic control of the operation, and is a practical technology that is easy to popularize and apply.