25 results about "Styrene Monomer" patented technology

This invention discloses a BMC material for preparing food contact products and its preparation method. The material comprises the following components by mass percentage: 12%–20% food contact grade styrene-based unsaturated polyester resin (compliant with GB 4806.7-2016); 3%–10% solvent-free PMMA powder; 0.5%–1% zinc stearate; 0.2%–0.6% curing agent TBIC; 0.01%–0.1% polymerization inhibitor TBHQ; 0.01%–0.05% stabilizer BHT; 20%–45% calcium carbonate; 10%–40% aluminum hydroxide; and 5%–10% glass fiber. This invention, by using low-cost food contact grade styrene-based resin combined with solvent-free PMMA powder and optimizing the ratio of TBIC to TBHQ, achieves near-zero styrene monomer residue in the product while reducing costs. This effectively solves the problems of high cost, difficulty in processability adjustment, and monomer residue risk associated with traditional food contact grade BMC materials. The cost of the resulting material can be controlled below 7 yuan / kg, and it has both flame-retardant and high-strength properties, making it a widely viable alternative to traditional food contact grade plastics.

The present invention relates to a process for preparation of an ABS graft copolymer. The process comprises (i) grafting a butadiene latex with a gel content in a range from 75% to 90% with a first portion of acrylonitrile and styrene monomers in a percentage ratio in a range from 1.4 to 1.6, in presence of an initiator- 1 and a molecular weight regulator, carrying out the polymerization for 0.5 hours to 1.5 hours, (ii) adding a second portion of acrylonitrile and styrene, additional initiator- 1 and molecular weight regulator to step (i), and continuing polymerization for 3 hours to 5 hours, and (iii) additionally adding the initiator- 1 or an initiator-2 to step (ii), and continuing polymerization for 1 hour to 2 hours. The feeding pattern of monomers in the process provides a high polymerization rate and thereby reduces residual monomer content.

This invention relates to the field of oil and gas reservoir production engineering, and discloses a hydrolyzable polymer, its preparation method, a fracturing in-fracture hydrolyzable polymer drainage aid, and its application. The hydrolyzable polymer contains: structural unit one provided by a styrene monomer; structural unit two provided by a maleic anhydride monomer; optionally, structural unit three provided by an amine and / or ammonium monomer having an olefin double bond; and structural unit four provided by a fluorine-containing monomer having an olefin double bond. The molar ratio of structural unit two to structural units one and three is 1:(3-7):(0-2.5); and the content of structural unit four is not less than 0.05 wt%. The drainage aid of this invention overcomes the shortcomings of existing drainage aids, such as excessive adsorption near the wellbore and "chromatographic separation" during migration. Furthermore, it exhibits low interfacial tension after hydrolysis, making it highly valuable for application.

The application relates to the technical field of waste plastic recycling, and discloses a mixed plastic waste high-value recycling method based on pre-classification and sequential depolymerization. First, mixed plastic waste is crushed and dried, then wet flotation is carried out by using two solutions with different densities, and PET-rich material pieces, PS-rich material pieces and polyolefin-rich material pieces are separated. Subsequently, the PET-rich material pieces are subjected to catalytic alcoholysis to recycle high-purity bis-hydroxyethyl terephthalate monomers; the PS-rich material pieces are subjected to catalytic pyrolysis to recycle high-purity styrene monomers; and the polyolefin-rich material pieces and process residues are subjected to pyrolysis to be converted into pyrolysis oil. By the strategy of 'first separation and then treatment', high-selectivity and high-yield recovery of high-value components in complex mixed plastics is realized, the process route is clear, and the method is economic and environmentally friendly.

The present disclosure relates, according to some embodiments, to a method for recovery of lithium ions from a lithium-ion containing liquid, the method comprising the steps of coating a nanoparticle with a styrene monomer; polymerizing the styrene monomer to form a polystyrene-coated nanoparticle; attaching a dibenzo-12-crown-4-ether to the polystyrene-coated nanoparticle to form a lithium adsorbing medium; exposing the lithium ion-containing liquid to the lithium adsorbing medium to form a lithium-rich adsorbing medium; and extracting the lithium ion from the lithium-rich adsorbing medium.

This invention provides a porous polystyrene foam material and its preparation method, belonging to the field of polymer porous materials technology. It addresses the problem that the limited stability of a single emulsion system in a high internal phase emulsion system leads to insufficient uniformity of the pore structure and limited improvement in the compressive strength of the prepared foam material. The preparation method includes: mixing and emulsifying bio-based nanoparticles, a choline-based ionic liquid, a continuous phase, and an internal phase to obtain a high internal phase emulsion; the continuous phase includes styrene monomer, a crosslinking agent, and an initiator; the amount of bio-based nanoparticles is 0.1–10 wt% of the total mass of the continuous phase, and the amount of the choline-based ionic liquid is 0.05–5 wt% of the total mass of the continuous phase; the high internal phase emulsion is polymerized and cured, and dried to obtain the porous polystyrene foam material. The porous polystyrene foam material prepared by this method has a relatively uniform pore structure and high compressive strength.

This invention discloses a method for preparing a low-residue styrene-maleic anhydride copolymer resin, belonging to the field of polymer synthesis technology. The preparation method includes: dissolving styrene monomer, maleic anhydride monomer, and a bifunctional trithiocarbonate RAFT reagent in an organic solvent, and then performing RAFT controlled free radical polymerization via thermal or photoinitiation. The R group of the RAFT reagent contains a 4-dimethylaminopyridine structure, which directionally enriches maleic anhydride monomer around the polymerization active center through dynamic hydrogen bonding-ion pairing, forcibly forming an alternating copolymer structure; its Z group contains a substituted cyclohexyl peroxyketal structure, which can decompose in situ under thermal or photo-triggered conditions to generate initiating free radicals without the need for an external initiator. This method achieves precise control of the copolymer's molecular weight and sequence structure, resulting in a resin with low free reagent and monomer residues, controllable number-average molecular weight, and a small molecular weight distribution coefficient.

This invention provides a modified glass powder, its preparation method, photovoltaic silver paste, and solar cells. The preparation method of the modified glass powder includes the following steps: S1: Mixing a first solvent, a polymeric monomer, a structure control agent, and an initiator to react and obtain polymer chains; then adding silicon tetrachloride to the reaction solution to end-cap the polymer chains, obtaining a first solution containing functionalized polymer chains; wherein the polymeric monomer includes one or more of styrene monomers, conjugated diene monomers, and vinyl monomers; S2: Mixing a second solvent, silica-containing glass powder, and the first solution to cause the functionalized polymer chains to be branched onto the surface of the glass powder, obtaining modified glass powder. The modified glass powder prepared by this method has better compatibility with the carrier in photovoltaic silver paste, and can reduce the agglomeration of glass powder, resulting in better dispersibility and storage properties.

This invention provides a method for producing styrene-based resins that can contribute to reducing the carbon footprint. [Solution] According to the present invention, a method for producing a styrene resin is provided, comprising a polymerization step, wherein in the polymerization step, a raw material monomer containing a styrene monomer (B) is polymerized, and the styrene monomer (B) has a sustainable ratio of 0.1 to 100% assigned using a mass balance method.

Provided are pigment-containing resin particles in which the deterioration of light emission intensity has been suppressed. The pigment-containing resin particles each have a core part and a shell part and contain a europium complex. The core part and the shell part are each crosslinked, the core part contains a polymer of hydrophobic monomers which includes a styrene monomer as the main component and another monomer, and the shell part contains a polymer of hydrophilic monomers. The other monomer satisfies relationship (B1) and relationship (15), below.　(B1) LogP_f ≥ 3.60 (15) (Mol_f) / (Mol_St) ≥ 0.05

Provided herein are compositions including lipids and copolymers in the form of a nanodisc assembly. The subject copolymers include monomer units of styrene and monomer units selected from acrylic acid and an acrylic acid derivative. In certain cases, the copolymer is a copolymer of styrene and acrylic acid. Also provided herein, is an aqueous solution comprising the subject composition. Also provided herein, are methods for producing a nanodisc assembly, including incubation of a lipid and a subject copolymer. Further provided herein, are methods for solubilizing a membrane protein in an aqueous solution, wherein the method includes forming a nanodisc assembly of a lipid bilayer having one or more membrane proteins embedded therein, and a subject copolymer. Also provided are methods of solubilizing a hydrophobic constituent in an aqueous solution, including forming a nanodisc assembly of a lipid, a hydrophobic constituent, and a subject copolymer.

The application discloses a kind of water-based single-component epoxy emulsion and preparation method thereof.The single-component water-based epoxy emulsion includes epoxy resin modified by ethoxy segment and sulfonate group, and can be emulsified into single-component water-based epoxy.The pH stability of the single-component water-based epoxy is better than that of ion-type epoxy emulsion with neutralized and salified acrylic acid, and the mechanical stability of the emulsion is better due to the introduction of ethoxy segment.The introduction of styrene monomer and / or acrylate monomer can improve the brittle characteristics of the epoxy resin, and the high hardness of the epoxy resin can be considered, so that single-component water-based epoxy coating with good impact resistance and high hardness can be obtained.By introducing imidazole group and a certain amount of dicyandiamide, good coordination with metal zinc ions of antirust pigment in anticorrosive paint can be achieved, and the single-component water-based epoxy coating with anticorrosive performance and self-repairing performance can be obtained.

The application provides an acrylic resin, a preparation method and application thereof, the acrylic resin comprises repeating units shown in general formula (1)-(3), vinyl cyclohexane monomers with similar structures to styrene monomers are used to copolymerize with acrylic monomers, heat resistance and moisture resistance of the acrylic resin are enhanced, and the moisture resistance of the resin can be further improved by adding cycloalkyl acrylate as a third monomer, so that the application of the acrylic resin in a high-temperature and high-humidity environment is improved.

The present application relates to fracturing fluid additive technical field, it is a kind of low liquid film multifunctional emulsion thickening agent and its preparation method, the former raw material is acrylamide, acrylic acid, 2-acrylamido-2-methylpropane sulfonic acid, ethylene oxide, wetting reverse type polymerization monomer, white oil, initiator, tackifying agent, emulsifier, styrene monomer and water according to mass fraction count.This application enhances the displacement driving force and emulsion temperature resistance and salt tolerance of filtrate loss liquid and part of broken glue liquid by selecting wetting reverse type polymerization monomer, significantly reduces the filtration of most gas field fracturing fluid, has multiple functions such as cleanup, anti-swelling, core liquid film thickness reduction, etc., has greater application value, on the other hand, micellar tackifying control mechanism is introduced, micellar controllable tackifying is realized, and it has irreplaceable effect in flowback fluid utilization and high temperature resistance.

This invention discloses a fluorinated styrene-grafted polypropylene insulating material, its preparation method, and its applications, relating to the field of insulating materials. The insulating material comprises structural units derived from polypropylene and structural units derived from fluorinated styrene. The preparation method involves mixing polypropylene, fluorinated styrene, a swelling agent, and a solvent, followed by a swelling treatment, and then adding a water-soluble initiator to carry out a grafting reaction to obtain the insulating material. This application introduces fluorinated styrene side chains with extremely low LUMO energy levels into polypropylene through chemical grafting. The swelling agent selectively swells the amorphous regions of polypropylene, providing a uniform channel for the fluorinated styrene monomer and initiator to enter the particle interior. This ensures the uniform distribution of functionalized side chains in the insulating material bulk and a high grafting rate, improving the breakdown strength and space charge control capability of the insulating material, making it suitable for applications in insulating products under high field strength.

The present invention provides an unsaturated polyester resin for RTM molding that exhibits stable curing time regardless of storage period and can suppress the occurrence of warping in molded products obtained by RTM molding. [Solution] An unsaturated polyester resin composition comprising an unsaturated polyester resin (A) and an unsaturated monomer (B), wherein the unsaturated polyester resin (A) consists of constituent units derived from an acid component and an alcohol component, the acid component contains an unsaturated dibasic acid such as phthalic anhydride and maleic anhydride, the alcohol component contains at least one of ethylene glycol and diethylene glycol and propylene glycol, the unsaturated monomer (B) is a styrene monomer, and the unsaturated polyester resin composition contains formic acid (C), the content of which is 0.01 to 0.1 parts by mass per 100 parts by mass of the total amount of resin (A) and monomer (B), an unsaturated polyester resin composition for RTM molding.

This invention proposes a bulk polymer-modified high-vibration-resistance and high-impact ABS resin and its preparation method. The method involves mixing and dissolving toughening rubber, solvent, monomers acrylonitrile, acrylate monomers, and styrene monomer to form a raw rubber solution. The raw rubber solution, vibration-damping reinforcing agent, initiator, and chain transfer agent are then fed into four plug flow reactors connected in series for continuous bulk polymerization. The polymerized material is then extruded for devolatilization and granulation to obtain the high-vibration-resistance and high-impact ABS resin. This invention enhances molecular chain flexibility and compatibility by adding monomeric acrylate elastomers and vibration-damping reinforcing agents during continuous bulk polymerization without adding any mechanical performance additives. Simultaneously, it adjusts the monomer composition, controls the polymerization temperature and stirring rate, and adjusts the rubber particle size and the degree of crosslinking of the product. This ensures the mechanical properties of the product while improving the damping performance of the resin and thus enhancing the vibration resistance of the ABS resin.

This invention provides syndiotactic polystyrene, its preparation method, resin composition, articles, and applications. The preparation method of the syndiotactic polystyrene includes: subjecting styrene monomer to an addition polymerization reaction in the presence of a catalyst and a mixture of saturated hydrocarbons to obtain the syndiotactic polystyrene; the mass percentage of the saturated hydrocarbon mixture in the syndiotactic polystyrene is 0.5% to 5%. The syndiotactic polystyrene obtained by the preparation method of this invention exhibits excellent color uniformity, providing a more uniform dispersion matrix for the introduction of antioxidants and other additives in subsequent processing, improving the dispersion uniformity of additives, and without affecting the mechanical properties of the syndiotactic polystyrene, and without causing an increase in mold fouling during processing.

The application belongs to the technical field of polymer materials, and particularly relates to an environment-friendly high-strength expandable polystyrene and a preparation method thereof, which comprises the following raw materials in parts by weight: 90-100 parts of styrene monomer, 120-150 parts of deionized water, 3-5 parts of modified montmorillonite, 0.3-0.8 parts of modified dispersant, 0.3-0.6 parts of composite initiator and 5-6 parts of foaming agent; firstly, sodium-based montmorillonite is activated, modified by silane and treated by organic intercalation to prepare modified montmorillonite; meanwhile, hydroxyethyl cellulose is modified by silane to prepare modified dispersant; then, the modified montmorillonite and the modified dispersant are ultrasonically dispersed in the deionized water, the styrene monomer and the composite initiator are added for suspension polymerization, and finally, the foaming agent is added; the expandable polystyrene prepared by the application has the characteristics of high mechanical strength and good environmental protection performance, and the preparation process is stable and suitable for industrial production.

This invention discloses a selenium-thiolated RAFT reagent, its synthesis method, and its applications. The RAFT reagent is prepared by organic synthesis in the presence of selenium powder, sodium borohydride, carbon disulfide, and methyl 2-bromopropionate under an inert atmosphere. The RAFT reagent of this invention, as a chain transfer agent, is applied to the free radical polymerization of highly reactive acrylate monomers and less reactive styrene monomers, exhibiting living polymerization characteristics and good polymerization controllability. Selenides are used as regulators to synthesize organoselenium polymers with predetermined molecular weights, selenium content, and functional groups. The RAFT reagent has a light color, and the final polymer product is essentially free of RAFT reagent color.

This invention provides a method for in-chain modification of solution-polymerized styrene-butadiene rubber (SBR) and its application. The modification method includes the following steps: S1, mixing styrene monomers and butadiene, solvent toluene, and a polar modifier, single-ended hydrogen-containing silicone oil, and adding an alkyl lithium initiator for reaction; S2, adding a platinum catalyst to the product obtained in S1 for reaction; S3, precipitating the product in S2 using methanol as a precipitant, filtering, and drying. This method uses single-ended hydrogen-containing silicone oil as a polarity modifier to prepare randomized SBR. After the reaction, the single-ended hydrogen-containing silicone oil is added to the raw rubber chain via hydrosilylation, changing the polarity of the raw rubber, improving the interfacial bonding force between SBR and filler silica, and making the filler more uniformly dispersed in the rubber compound, thereby improving the mechanical properties and wet skid resistance of the rubber and reducing its rolling resistance.

This invention relates to the field of polymer modifier technology, specifically to a functional N-phenylmaleimide heat-resistant and flame-retardant resin, its preparation method, and its application in ABS resin. The invention first synthesizes a binary copolymer compatibilizer using styrene monomer, acrylonitrile monomer, and 1,3-butadiene via anionic polymerization; secondly, it synthesizes a homopolymer toughening agent with a wide molecular weight distribution using 1,3-butadiene; then, the compatibilizer, toughening agent, N-phenylmaleimide, and the small molecule flame retardant 2,4,6-trihalophenylallyl ether are emulsion polymerized to prepare the functional N-phenylmaleimide heat-resistant and flame-retardant resin. The method of this invention combines the advantages of anionic and emulsion polymerization, integrating heat-resistant groups, flame-retardant components, and a wide molecular weight distribution [-BR-]. L The chain is integrated into the molecular chain, which significantly improves the heat resistance, flame retardancy and impact resistance of ABS resin.

A porous body (1) has a crosslinked polymer (11) of a polymerization product of an acrylic monomer and / or a styrene monomer as a base resin. The porous body (1) has a storage elastic modulus at 23°C of 5 kPa or more and 2000 kPa or less. The apparent density of the porous body (1) is 10 kg / m 3 or more and 250 kg / m 3 or less. The crosslinked polymer (11) has a glass transition temperature of -30°C or more. The crosslinked polymer (11) has a molecular weight between crosslinking points of 1.0 x 10 4 or more. The porous body (1) is obtained by polymerizing a monomer in a water-in-oil high internal phase emulsion in which an aqueous phase is enclosed in an organic phase at a high ratio.

This application relates to the field of polymer materials, and in particular to a high-flowability rapid-molding EPS resin and its preparation method. A high-flowability rapid-molding EPS resin comprises the following raw materials in parts by weight: 100 parts styrene monomer, 0.5-2 parts dispersant, 0.1-1 parts initiator, 5-12 parts foaming agent, 0.5-3 parts composite nucleating agent, 0.2-1.5 parts microencapsulated lubricant, and 0.01-0.1 parts molecular weight regulator; the composite nucleating agent is a mixture of an inorganic nucleating agent and an organic nucleating agent in a weight ratio of 1:(0.5-2); the microencapsulated lubricant consists of a lubricant core and a polymer wall material. By employing the synergistic effect of molecular weight distribution control, composite nucleation, and microencapsulated lubrication, the resin is uniformly filled in an automatic molding machine, demolded rapidly, and the molding cycle can be shortened, while the compressive strength of the finished product is improved.