176 results about "Polystyrene bead" patented technology

The present invention provides a fluidized positioning system including an inner bladder formed of a medium that has no memory or substantially no memory. An outer bladder is placed adjacent to or coupled to the inner bladder. The outer bladder is partially filled with a composition. The composition can be beads, such as polystyrene beads, or beads made of a similar medium. A valve extending from the outer bladder permits the evacuation of all or some of the air from the outer bladder which causes the outer bladder to be reduced in size due to loss of air between the beads and adjusts the rigidity of the outer bladder to allow the outer bladder to form fit the inner bladder around whatever body extremity it is being used on.

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 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).

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.

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.

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 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.