58 results about "Emulsion polymerization" patented technology

The invention relates to a salt-resistant thickening agent and fracturing fluid. The thickening agent is obtained by inverse emulsion polymerization; the inverse emulsion comprises a water phase solution; the water-phase solution is prepared from the following raw material components: methacryloylethyl sulfobetaine, a sulfonic acid group-containing monomer, acrylamide and acrylic acid; wherein the content of the methacryloylethyl sulfobetaine is 4 to 6 parts by weight, the content of the sulfonic acid group-containing monomer is 3 to 5 parts by weight, the content of the acrylamide is 15 to 20 parts by weight, and the content of the acrylic acid is 1 to 3 parts by weight. According to the thickening agent, the tackifying performance of a high-molecular polymer and the salt resistance of a viscoelastic surfactant are combined, a salt-resistant functional group sulfonic acid group and an amphoteric functional group betaine are introduced into molecules of the thickening agent, and the thickening agent obtained through inverse emulsion polymerization has good thickening, salt-resistant and calcium-resistant effects.

The invention discloses an acrylate emulsion containing a zinc ion crosslinking agent and a preparation method of the acrylate emulsion, and alkali-soluble resin containing zinc ions is used as a macromolecular surfactant to prepare a self-crosslinking polyacrylate emulsion. In the emulsion polymerization process, a Zn < 2 + > metal ion cross-linking agent is introduced, so that the problem of demulsification caused by damage of high-valence metal cations in the metal ion cross-linking agent to double electric layers of the anionic acrylic emulsion is solved, the degree of cross-linking of a latex film is remarkably improved, the fineness and the particle size of the emulsion are effectively reduced, and the preparation method is simple and easy to implement. And the latex film is endowed with a certain antibacterial function.

The invention discloses a preparation method of a high-acrylic-acid-content polyacrylamide / acrylic acid copolymer emulsion for improving the recovery efficiency of a high-temperature and high-salt oil reservoir, and belongs to the technical field of oilfield chemistry and functional polymer materials. According to the method, a reversed-phase microemulsion polymerization system is adopted, a combination of a cationic surfactant hexadecyl trimethyl ammonium bromide and an amphiphilic initiator azodiisobutyronitrile is introduced, an electrostatic enrichment effect is generated at a water core interface, and acrylate anions are selectively adsorbed and locally concentrated, so that the reactivity rate of a monomer is regulated and controlled, and the amphiphilic polymer is prepared. And the grafting proportion of acrylic acid in the copolymer is obviously improved. The method is simple in process and mild in condition, and the obtained emulsion has the advantages of being high in solid content, good in storage stability, fast in dissolution, free of fisheye and the like, is suitable for high-temperature and high-salinity oil reservoir conditions and has good industrial application prospects.

This invention discloses an anionic hydroxyl silicone oil emulsion and its preparation method, relating to the field of polysiloxane emulsion technology, and belonging to patent classification number C08G77 / 04. The preparation method is as follows: Triethanolamine dodecylbenzenesulfonate salt, tridecyl alcohol polyether, and deionized water are mixed and dissolved, heated, and polydimethylsiloxane alcohol is added under high-speed shearing for homogenization. Water is added and the reaction is maintained at a constant temperature to obtain a basic emulsion. γ-(methacryloyloxy)propyltrimethoxysilane is added dropwise to react and obtain an interface-reinforced emulsion. Acrylamide, N-hydroxymethylacrylamide, etc., are pre-emulsified and then added to the interface-reinforced emulsion with ammonium persulfate under nitrogen protection. Polymerization forms a cross-linked polymer shell. After cooling, tert-butylhydroquinone and disodium ethylenediaminetetraacetate are added to obtain an antioxidant emulsion. Phenoxyethanol and octyl glycol are added to obtain the final emulsion. This method significantly improves the thermal stability of the emulsion through the synergistic effects of composite emulsification, interface reinforcement, shell protection, and antioxidant properties, making it suitable for high-temperature environments.

The application belongs to the field of petrochemical industry, and particularly relates to an amino-modified polymer, a preparation method and application, more particularly to an amino-modified polymer as a surfactant for use as a crude oil demulsifier in crude oil dehydration. The amino-modified polymer with a snowman-like molecular structure is prepared by seed emulsion polymerization and post-modification, and is composed of a hydrophilic silicon-containing inorganic "head" and an oil-wet amino-modified organic group "body". The average particle size of the amino-modified polymer is 1-2 microns. When the amino-modified polymer is used as a crude oil demulsifier, the dehydration rate of crude oil can reach 80-97% within 90 minutes at 60 DEG C.

The invention discloses a high-stability non-fluorine polymer waterproof and oil-proof agent and a preparation method thereof, and belongs to the technical field of functional finishing of textiles. The waterproof and oil-proof agent is prepared by emulsion polymerization of a long-chain acrylate monomer, a cyclic acrylate monomer, alkylene-containing silane, a chlorine-containing monomer, epoxy-vinyl double-modified silicone oil, nanoparticles, a surfactant, a cosolvent, water and an initiator according to a specific proportion. Epoxy groups in the epoxy-vinyl double-modified silicone oil can neutralize acidic substances generated in the polymerization process, and the storage stability of the emulsion is remarkably improved; meanwhile, vinyl participates in copolymerization, epoxy groups enhance the binding force with the fabric, and the fabric is endowed with excellent waterproof, oil-proof and washable properties by cooperating with silane and nano particles. The product provided by the invention does not contain PFAS, is environment-friendly, and solves the technical problems that the existing fluorine-containing finishing agent is limited in environmental protection and the traditional vinyl chloride / vinylidene chloride emulsion is poor in stability.

The application discloses a multifunctional variable-viscosity slick water fracturing fluid additive, a preparation method and application, relates to the slick water fracturing technical field, and solves the technical problem that the multifunctionalization of the fracturing fluid additive is difficult to be realized through simple compounding, wherein the nano anti-swelling agent particles are added into white oil containing a hydrocarbon-fluorocarbon surfactant mixed emulsified system to obtain an oil phase, the water phase is composed of a water-soluble vinyl monomer aqueous solution and an initiator, the fracturing fluid additive is prepared through high-speed shearing emulsification, nitrogen deoxygenation, reverse-phase emulsion polymerization reaction of oxidation and reduction initiation, and demulsification process of reverse-phase surfactant. The application has the anti-swelling performance, and the anti-swelling performance is synergistically provided with the ammonium ion in the water phase; the use amount of the ordinary hydrocarbon surfactant is reduced, the surface interfacial activity is good under the reasonable addition amount, and the gel breaking fluid has a relatively low surface interfacial tension.

The invention provides a preparation method of a polymer-based radiation refrigeration material with a porous particle nested structure, and belongs to the technical field of radiation cooling energy-saving structural materials. The preparation method comprises the following steps: preparing a pre-emulsion from the polymer matrix, the diluent and the emulsifier; the polymer matrix is water-insoluble polymer polydimethylsiloxane and the like; preparing dispersion liquid from nano particles and water; adding the dispersion liquid into the pre-emulsion, and violently stirring to obtain a water-in-oil emulsion; and obtaining the polymer-based radiation refrigeration material by an emulsion template method. The internal structure of the material is composed of three photon scattering interfaces with refractive index gradients, including air / polymers, nanoparticles / polymers and air / nanoparticles, and the solar reflectivity greater than 93.0% and the atmospheric window emissivity greater than 96.0% are achieved. According to the material, the temperature is reduced by 5.0 DEG C at the lowest environment temperature in the daytime, and the maximum radiation cooling power can reach 61.0 W / m < 2 >; the temperature is reduced by 16.0 DEG C at night compared with the lowest environment temperature, and the maximum radiation cooling power can reach 105.5 / W m < 2 >.

The application provides a special plastic concrete for circulating fluidized bed boilers and a preparation method thereof. In the binder, vinyl siloxane and octadecyl acrylate functional monomers are used to improve the bonding strength, styrene is used to improve the high-temperature resistance of the binder, and a pre-emulsified semi-continuous emulsion polymerization is used to obtain a polyacrylate thermoplastic resin with a core-shell structure as the binder, thereby improving the pressure resistance, heat insulation, high-temperature resistance and durability.

To provide a water-in-oil emulsion that relates to a water-in-oil emulsion polymer used as a paper-making yield improving agent and a filtration aid, a coagulation processing agent and a sludge dewatering agent for industrial waste water and drainage and night soil sludge, and can improve storage stability by suppressing product separation and condensation and foreign matter compared with a conventional water-in-oil emulsion.SOLUTION: It is possible for a water-in-oil emulsion polymer to improve the storage stability, the water-in-oil emulsion polymer obtained by adjusting the charge on the surface of emulsion particles through the addition of ionic surfactants during the production of water-in-oil emulsion polymers, thereby promoting the repulsion between particles, and thus solve the aforementioned problem.SELECTED DRAWING: None

The invention provides a preparation method of an amphiphilic hybrid silicon-based antifouling coating, which comprises the following steps: S1, co-hydrolyzing a mixed organic silicon monomer and nano silicon dioxide, and adding a catalyst to carry out condensation polymerization to obtain organic-inorganic hybrid silicon resin; s2, reacting polyethylene glycol with a silane coupling agent containing an isocyanate group to obtain a polyethylene glycol prepolymer; s3, mixing the organic-inorganic hybrid silicon resin obtained in the step S1 with the polyethylene glycol prepolymer obtained in the step S2, and adding an amino silane curing agent for cross-linking reaction to obtain the amphiphilic hybrid silicon-based antifouling coating; the preparation method comprises the following steps: copolymerizing nano silicon dioxide serving as an inorganic phase with methylphenyldimethoxysilane, dimethyldiethoxysilane, KH560 and tetraethoxysilane through a water-dropping fixed emulsion polymerization method to synthesize organic-inorganic hybrid silicon resin, and introducing a polyethylene glycol flexible chain segment, so that the coating is endowed with efficient antifouling capacity while the integrity of the coating is maintained.

The application provides a quick-dissolving ternary copolymer emulsion type fracturing fluid thickening agent and a preparation method, and relates to the field of oil and gas exploitation. N,N,N'-trimethyl-N'-allyl ethylenediamine (TMPEMA) is prepared by reacting chloropropylene with N,N,N'-trimethyl ethylenediamine, and (N,N-dimethyl-N-ethyl-N'-allyl-N'-methyl-N'-ethyl)-ethyldibromide functional monomer is prepared by reacting TMPEMA with bromoethane. A monomer solution is prepared by using acrylamide, sodium p-styrene sulfonate and the functional monomer as an aqueous phase, using an emulsifier and liquid paraffin as an oil phase, slowly adding the aqueous phase into the oil phase, stirring uniformly under N2, and then adding an initiator drop by drop to perform inverse emulsion polymerization, so as to prepare the fracturing fluid thickening agent. The ternary copolymer fracturing fluid thickening agent has excellent viscosity increasing property, quick-dissolving capacity, salt resistance, temperature resistance and shear resistance. The prepared fracturing fluid has good viscoelasticity, gel breaking property, sand carrying property, filtration loss reducing property and the like, can be used as slick water at a low concentration and can be used as a sand carrying liquid at a high concentration, and has a good application prospect in offshore and shale oil and gas development.

The invention belongs to the technical field of compositions for treating wells, and particularly relates to a composite waterproof locking agent and application thereof in drilling fluid. The composite waterproof locking agent is formed by compounding a surfactant emulsion and nano polyester particles, wherein the surfactant emulsion is obtained by carrying out core-shell emulsion polymerization on a soft monomer, a hard monomer, a carboxyl-containing functional monomer, a second functional monomer and a fluorine-containing monomer in an emulsifier solution. The hard monomer improves the structural strength of a polymer molecular chain, the soft monomer improves the adhesive force of the polymer molecular chain, a carboxyl hydrophilic group of the carboxyl-containing functional monomer enables the molecular chain to be adsorbed to the surface of tight reservoir rock, and an outward hydrophobic group of the fluorine-containing monomer changes the wettability of the rock. Through the synergistic effect of compounding of the surfactant emulsion and the nano-polyester particles, wetting reversal of the rock surface is realized, so that the capillary resistance is improved, and the nano-particles can block micro-nano pores, reduce the filter loss of the drilling fluid and effectively inhibit water blocking damage.

The application relates to the field of fluorine-containing coatings and discloses a high-weather-resistance fluorine-containing acrylic composite coating and a preparation method thereof. The high-weather-resistance fluorine-containing acrylic composite coating is prepared by emulsion polymerization of 2-difluoromethyl-acrylic acid ethyl ester (DFMAET) as a main raw material, methyl methacrylate (MMA), butyl acrylate (BA) and glycidyl methacrylate (GMA). The fluorine-containing acrylic composite coating comprises, by mass percentage, 56-64% of fluorine-containing emulsion, 14-18% of titanium white powder (R type), 6-10% of nano-SiO 2 2-2.8% of film-forming aids, 0.16-0.24% of defoaming agents, 0.2-0.4% of thickening agents and deionized water, and the balance is 100%. Compared with traditional acrylate coatings and fluorocarbon coatings, the coating has the advantages of high weather resistance, low surface energy, balanced mechanical properties, economy and environmental protection, and the like. The coating has the effects of resisting ultraviolet light and salt spray corrosion.

The invention relates to the field of fluorine-containing coatings, and discloses a high-weather-resistance fluorine-containing acrylic acid composite coating and a preparation method thereof. The high-weather-resistance fluorine-containing acrylic acid composite coating is prepared by taking 2-difluoromethyl-ethyl acrylate (DFMAET) as a main raw material and carrying out emulsion polymerization on the DFMAET, methyl methacrylate (MMA), butyl acrylate (BA) and glycidyl methacrylate (GMA). The fluorine-containing acrylic acid composite coating is prepared from the following components in percentage by mass: 56 to 64 percent of fluorine-containing emulsion, 14 to 18 percent of titanium dioxide (R type), 6 to 10 percent of nano SiO2, 2 to 2.8 percent of coalescing agent, 0.16 to 0.24 percent of defoaming agent, 0.2 to 0.4 percent of thickening agent and the balance of deionized water. Compared with traditional acrylate coatings and fluorocarbon coatings, the coating has the advantages of high weather resistance, low surface energy, balanced mechanical properties, economy, environmental protection and the like. And the coating has the effects of resisting ultraviolet irradiation and salt spray corrosion.

The invention discloses a macromolecular self-repairing material for a tire and a preparation method of the macromolecular self-repairing material. Comprising 55 to 65 parts of polyurethane modified rubber, 25 to 30 parts of emulsion polymerized styrene-butadiene rubber, 6 to 10 parts of ethylene-acrylate rubber, 12 to 20 parts of composite resin, 10 to 13 parts of naphthenic rubber oil, 7 to 11 parts of hydroxyl-terminated polyisobutene, 25 to 41 parts of composite reinforcing filler, 10 to 15 parts of a composite plasticizer, 1.5 to 2.5 parts of a titanate coupling agent, 1 to 1.5 parts of a vulcanizing agent, 0.5 to 0.8 part of an assistant crosslinker, 0.4 to 0.7 part of a vulcanization accelerator and 1.5 to 2.5 parts of a vulcanization accelerator. The high-molecular self-repairing material for the tire can realize the self-repairing effect of the tire, has excellent durability and adhesive force, greatly improves the anti-puncture and anti-air-leakage functions of the tire, and improves the safety performance of a vehicle.

The invention relates to the technical field of coatings, in particular to a high-stability graphene water-based dispersion liquid and a heat-conducting coating containing the dispersion liquid. The dispersion liquid is prepared by performing multi-stage grinding on a mixed surfactant, a defoaming agent, graphene powder and deionized water, wherein the mixed surfactant is prepared from sodium carboxymethyl cellulose, polyvinyl alcohol and an acrylic acid-acrylate-sulfonate terpolymer according to a ratio of 1: 1: 1; on the basis, an in-situ polymerization and semi-continuous seed emulsion polymerization process is adopted, a dispersion liquid and an acrylate monomer are copolymerized to prepare a modified emulsion, and then the modified emulsion and nano boron nitride premixed slurry are compounded to form the heat-conducting coating. According to the invention, the problems of poor dispersion stability, high interface thermal resistance and the like of graphene in a polymer matrix are effectively solved, and the prepared heat-conducting coating has excellent heat-conducting property, interface bonding strength and process stability, and is suitable for heat management fields such as heat dissipation of electronic devices and the like.

The invention belongs to the technical field of coal rock drilling, and relates to a viscose emulsion added into drilling fluid and used for enhancing coal rock strength and a preparation method of the viscose emulsion. The emulsion is prepared through emulsion polymerization and is prepared from the following raw materials: an oil phase, a water phase and a surfactant. The oil phase comprises a main monomer, a functional monomer, a crosslinking monomer, a first initiator and a solvent. The prepared emulsion can block coal rock pores to prevent drilling fluid from invading, the compressive strength of the coal rock is enhanced through the bonding effect, meanwhile, the affinity of the emulsion to coal and metal is different, and the rod sticking risk can be reduced. The prepared emulsion is mixed with drilling fluid to soak the coal rock, so that the original strength of the coal rock can be basically kept, and the problems of borehole wall instability, drill jamming caused by chipping and the like in the coal rock gas drilling process are solved.

The application discloses a preparation method of a water-based polyurethane / fluorocarbon composite coating with flash rust prevention, stain prevention and self-repairing functions. x The application discloses a preparation method of a water-based polyurethane / fluorocarbon composite coating with flash rust prevention, stain prevention and self-repairing functions.

The invention relates to the field of textile assistants, and discloses a preparation method of a washable antistatic agent of macromolecular quaternary ammonium salt, which comprises the following steps: esterifying cardanol polyoxyethylene ether, maleic anhydride and dimethylaminoethanol step by step, then adding benzyl chloride for quaternization reaction to obtain cardanol polyoxyethylene ether maleic acid ethyl dimethyl benzyl ammonium chloride, and then adding benzyl chloride for quaternization reaction to obtain the washable antistatic agent of macromolecular quaternary ammonium salt. And by utilizing the emulsifying property and reactivity of the copolymer, styrene (ST) and allyl polyoxyethylene polyoxypropylene ether are used as comonomers, azobis (isobutylamidine hydrochloride) (AIBA) is used as an initiator, and the polymer quaternary ammonium salt type antistatic agent is obtained in an emulsion polymerization manner. The high-molecular quaternary ammonium salt washable antistatic agent prepared by the invention can effectively solve the problem of static electricity on the surface of a fabric caused in actual production, can also solve the problem of insufficient washability of a conventional antistatic agent, can still keep the antistatic performance of the surface of the fabric after being washed with water for 10-15 times, and is a washable antistatic agent.

A nanometer-micrometer plugging agent, comprising starch solid particles and a polymer, the polymer comprising structural units derived from monomer A, monomer B, monomer C and monomer D, wherein monomer A is selected from one or more of acrylic acid, methacrylic acid and maleic anhydride; monomer B is selected from one or more of monomers having the structure shown in formula (I); monomer C is selected from one or more of monomers selected from the structure shown in formula (II); and monomer D is divinyl benzene. The nanometer-micrometer plugging agent of the present application is prepared by Pickering emulsion polymerization, with solid particles adsorbed on the surface of the dispersed phase droplets, preventing the aggregation between the liquid, the obtained oil / water dispersed phase has higher stability, is not easily affected by the external environment, and avoids the foaming problem of surfactants.

The present invention discloses a method for preparing a fluorine-containing polymer and a composition thereof, the method comprising the step of aqueous emulsion polymerization of one or more fluorinated monomers, the aqueous emulsion polymerization being performed in the presence of at least one surfactant comprising a monophosphate ester, the monophosphate ester contains an aromatic phenol group of an alkyl chain substituent; the monophosphate does not contain methyl, methylene and methine which are directly connected with an aromatic ring group; the surfactant does not contain methine; the methylene content of the surfactant is lower than 20% in terms of carbon atom number. According to the preparation method of the fluorine-containing polymer, a PFAS substance is not used as a surfactant, so that the preparation method is environment-friendly.

A method for improving rainfastness of an agrochemical active ingredient comprises applying to a plant surface a composition containing at least one agrochemical active ingredient and a rainfastness enhancing agent, the rainfastness enhancing agent comprising an aqueous polymer dispersion, obtainable by radical aqueous emulsion polymerization of a mixture comprising a) ethylenically unsaturated monomers M, with M comprising at least one vinyl ester M1, and at least one (meth)acrylic acid ester M2, b) a carboxyl-groups-containing compound CGCC, c) at least one non-carboxylated saccharide and / or polysaccharide S, and d) at least one emulsifier selected from non-ionic and anionic surfactants, wherein wherein the dispersion has a pH of up to 4. The aqueous polymer dispersion is useful for enhancing the rainfastness of agrochemical active ingredients.

The invention provides a polymerized amino silicone oil emulsion and a preparation method thereof. The cleaning agent comprises the following components in parts by weight: octamethylsiloxane, an imidazolium ionic liquid surfactant, a nonionic surfactant polyoxyethylene ether, a catalyst, a coupling agent and water. The preparation method comprises the following steps: adding water, an imidazolium ionic liquid surfactant and a nonionic surfactant polyoxyethylene ether into a reaction kettle, heating and stirring; adding D4 and a coupling agent into the stirrer, uniformly mixing, and dropwise adding into the reaction kettle; after the reaction kettle is uniformly stirred, adding a catalyst, after the reaction is completed, adding a pH regulator, and terminating the reaction; adding a stabilizer and uniformly stirring; and detecting the finished product, and adding a preservative to obtain the polymerized amino silicon oil emulsion after the requirement is met. The polymerized amino silicon oil emulsion prepared by emulsion polymerization has high stability, and can uniformly smooth scales of hair and effectively maintain the smoothness and brightness of the hair when applied to shampoo products.

The present invention generally relates to the field of cross-linkable aqueous vinyl polymer dispersions, to a coating composition comprising said cross-linkable aqueous vinyl polymer dispersions; to a paint formulation comprising said cross-linkable aqueous vinyl polymer dispersions; and to an article coated with the coating composition or the paint formulation. In particular, the present invention provides an aqueous vinyl polymer dispersion PD which comprises the following polymers: —1) an aqueous dispersion of a vinyl polymer P1 obtainable by free radical emulsion polymerization of a monomers mixture comprising: a) 5 to 20 wt % acid functional ethylenically unsaturated monomers M1 or precursors thereof; b) 5 to 25 wt % ethylenically unsaturated monomers M2 containing a polyethylene glycol or monoalkoxy polyethylene glycol moiety; c) up to 90 wt % of non-ionic ethylenically unsaturated monomers M3 other than M1 or M2; d) 0 to 10 wt % ethylenically unsaturated monomers M4 with a functional group for cross-linking after film-formation; e) 0 to 10 wt % of at least one chain transfer agent CTA; where the sum of the wt. % of M1+M2+M3+M4+CTA=100 wt %; —2) an aqueous dispersion or solution of a vinyl polymer P2 obtainable by free radical copolymerization of: a) from 25 to 95 wt % of a ethylenically unsaturated monomers M5 selected from the group of N-vinyl amides with general structure (I) where R1 and R2 are alkyl from C1 to C5 and may be connected to form a ring-structure, preferably N-vinyl pyrrolidone or N-vinyl caprolactam; b) from 5 to 75 wt % of non-ionic ethylenically unsaturated monomers M3′ other than M5; c) from 0 to 5 wt % of ethylenically unsaturated monomers M4′ with a functional group for cross-linking after film-formation; d) from 0 to 10 wt % acid functional ethylenically unsaturated monomers M1′ or precursors thereof; e) from 0 to 5 wt % of at least one chain transfer agent CTA′; where the sum of the wt. % of: M5+M3′+M4′+M1′+CTA′=100 wt %; —3) a film-forming vinyl polymer P3 under the form of an aqueous dispersion comprising: i) from 20 to 60 wt % of a water-soluble or water dispersible crosslinkable vinyl oligomer OL obtained by emulsion polymerizing a monomer mixture comprising: 1) at least one acid functional ethylenically unsaturated monomer M1″; 2) at least one ethylenically unsaturated monomer M4″ with functionality for crosslinking upon film-formation, other than M1″; 3) at least one ethylenically unsaturated monomer M3″ other than M1″ and M2″, and 5) optionally, at least one chain transfer agent CTA″, and ii) from 40 to 80 wt % of a high molecular weight vinyl polymer P4 prepared by emulsion polymerizing, in the presence of the water-soluble or water-dispersible crosslinkable vinyl oligomer OL, a monomer mixture comprising: 1) optionally one acid functional ethylenically unsaturated monomer M1′″; 2) optionally one or more ethylenically unsaturated monomers M4″′ with functionality for crosslinking upon film-formation, other than M1′″; 3) at least one ethylenically unsaturated monomer M3′″ other than M1′″ and MT′ and 4) optionally, one or more multifunctional ethylenically unsaturated monomers for pre-crosslinking, M5′″, preferably in an amount less than 5 wt %, —Where the total weight of film-forming vinyl polymer P3=wt. % of the water-soluble or water dispersible crosslinkable vinyl oligomer OL+wt. % of the high molecular weight vinyl polymer P4=i)+ii)=100 wt % and—Where the total weight of the vinyl polymer in the aqueous vinyl polymer dispersion PD=wt. % of the vinyl polymer P1+wt. % of the vinyl polymer P2+wt. % of the film-forming vinyl polymer P3=100 wt %.

The invention discloses a high-performance PVDC (polyvinyl dichloride) preparation method based on microemulsion polymerization, and belongs to the technical field of PVDC emulsion polymerization, and the method comprises the following steps: preparing materials, pretreating raw materials, building and debugging a reaction device, dropwise adding an initiator, controlling a reaction process, and post-treating after the reaction is finished. According to the invention, the vinylidene chloride monomer is used as a core raw material, and the performance of PVDC is accurately regulated and controlled by adjusting the emulsifier and the co-emulsifier; free radical polymerization is initiated by an initiator, so that the PVDC emulsion with narrow particle size distribution and high crystallinity can be prepared; the reaction system is stable, the gel phenomenon is reduced, the monomer conversion rate is improved, and the production cost can be greatly reduced; the prepared PVDC product is uniform in particle size, the barrier property is remarkably improved, the shelf life of food is effectively prolonged, the requirements of multiple fields such as electronic protection and medicine packaging can be met, the application range is greatly expanded, a high-performance and reliable packaging material is provided for the industries such as food and medicine, and the economic benefits of enterprises are remarkably improved.

The invention discloses a tire tread rubber composition and a preparation method thereof, and belongs to the technical field of rubber compositions. According to the technical scheme, the rubber composition comprises highly branched solution polymerized styrene-butadiene rubber, high trans-butadiene rubber, emulsion polymerized styrene-butadiene rubber and modified carbon black amp. A white carbon black two-phase filler; the modified carbon black is amp; the white carbon black two-phase filler comprises modified carbon black, white carbon black, a silane coupling agent and carbon black amp; the invention discloses a white carbon black two-phase connecting agent. The tire tread rubber composition provided by the invention has wear resistance, grip performance and heat generation performance, and abundant branching sites and carbon black amp of a raw rubber system; the white carbon black two-phase filler is combined to a rubber molecular chain under the action of the silane coupling agent to form a multi-point network whole, so that the wear resistance is improved, and meanwhile, the carbon black is amp; n-rich lone pair electrons of the white carbon black two-phase bonding agent can form coordination complexation with Zn atoms in zinc oxide, S free radicals are captured in the vulcanization reaction, a cross-linking system is further strengthened, the integrity of the composition is improved, and the wear resistance is further improved.

The present invention aims to provide a method for producing an emulsion composition which is excellent in storage stability and can be used as a single-component liquid from the viewpoint of operability, and which forms a coating film on a substrate such as paper or film, the coating film being excellent in water vapor barrier properties. A method for producing an emulsion composition is a method for producing an emulsion composition obtained by emulsion polymerization of a vinyl group-containing monomer mixture (D) in the presence of water (A), a surfactant (B), and paraffin (C) having a melting point in the range of 57°C to 71°C, characterized in that the temperature at which the emulsion polymerization is performed is higher than the melting point of the paraffin (C) present at the time of the emulsion polymerization, and that the following (1) or (2) is satisfied. (1) The surfactant (B) contains a low-molecular emulsifier (B1) having a sodium sulfonate group. (2) Glycerol methacrylate (E) is contained at the time of the emulsion polymerization.

The invention discloses a fluoride-free water repellent synthesized based on an acrylic acid docosyl ester compound. The fluoride-free water repellent is prepared by the following steps: step 1, emulsifying the acrylic acid docosyl ester compound, a functional acrylic monomer, a polar olefin compound, a thiol compound, an acetate compound, a surfactant and water; 2, introducing inert gas into the reactant emulsion, heating to a reaction temperature, adding an initiator, and reacting for a preset time to obtain a fluoride-free water repellent emulsion; and the docosyl acrylate compound is docosyl acrylate or docosyl methacrylate. The water repellent is synthesized by adopting the docosyl acrylate compound as a main monomer, the fluorine-free water repellent emulsion synthesized by adopting an emulsion polymerization method has the solid content of more than 30%, and the fluorine-free water repellent emulsion has excellent storage stability and more excellent hydrophobicity and water repellency.

The invention discloses an acrylic pressure-sensitive adhesive for PE foam and a preparation method of the acrylic pressure-sensitive adhesive. The acrylic pressure-sensitive adhesive is mainly prepared from the following raw materials: 2-ethylhexyl acrylate, acrylic acid, 2-(perfluorohexyl) ethyl methacrylate, hydrogenated rosin glyceride, terpene phenolic resin, vinyl modified nano silicon dioxide and an organic solvent. The preparation method comprises the following steps: firstly, carrying out emulsion polymerization on the acrylate monomer, the surfactant and the solvent step by step to obtain a pre-emulsion; then sequentially adding hydrogenated rosin glyceride, terpene phenolic resin, vinyl modified nano silicon dioxide, isocyanate and a silane coupling agent, and finally reacting in a dark place. The prepared acrylic pressure-sensitive adhesive has high peel strength when being used on a PE foam base material, can realize lasting bonding of PE foam, and does not have edge warping and falling after damp-heat aging.