7 results about "Emulsion copolymerization" patented technology

This invention relates to the field of waterproof coatings, specifically to a waterproof coating and its preparation method; comprising: 40 to 70 parts of functionalized polymer emulsion, 10 to 30 parts of pigments and fillers, 1 to 3 parts of film-forming aid, 0.2 to 0.5 parts of defoamer, and 10 to 20 parts of water; as the core material, the above-mentioned functionalized polymer emulsion is prepared by in-situ soap-free emulsion copolymerization process using multiple polymer monomers, including a multifunctional fluorosilicone modified monomer; the multifunctional fluorosilicone modified monomer has a triazine ring structure framework, and 2-(perfluorohexyl)ethoxy, 2-(methacryloyloxy)ethoxy, and 3-(triethoxysilyl)propylamino are respectively attached to the three carbon atoms of this framework; this invention can significantly improve the adhesion of the coating to the substrate, while the triazine ring framework enhances the stability of the overall molecular structure, greatly improving the waterproof effect and weather resistance of the coating.

The present application relates to PC resin toughening agent technical field, aiming at the problems of poor mutual solubility of organic silicon material and PC resin, poor low-temperature toughening performance of traditional toughening agent, etc., the present application discloses a kind of shell-core structure phenylpropene resin modified organic silicon elastomer toughening agent and its preparation method and application, including the following steps: hydrogen-containing silicone oil, vinyl silicone oil, third alkenyl functional component and catalyst are uniformly mixed, pre-emulsification is carried out under the action of surface active agent and thickening agent, and organic silicon pre-emulsion SiE is obtained;Another alkenyl phenyl compound, acrylic ester and / or crosslinking agent are uniformly mixed, then molecular weight regulator and oil-soluble initiator are added, pre-emulsification is carried out under the action of surface active agent and water, and phenylpropene pre-emulsion SAE is obtained;Then, organic silicon pre-emulsion is heated first to carry out water-phase silicon hydrogenation addition reaction, then phenylpropene pre-emulsion is added dropwise to carry out suspension emulsion copolymerization, then demulsification, drying, and the shell-core structure phenylpropene resin modified organic silicon elastomer toughening agent can be obtained.

This invention relates to an aqueous copolymer emulsion (1) suitable for gas-liquid mass transfer to reduce VOCs, wherein the copolymer emulsion (1) is a copolymer based on: a) 1 wt.% to 99.5 wt.% methyl methacrylate (MMA), b) 0 wt.% to 20 wt.% of one or more hydrophilic monomers with a water solubility greater than 0.3 g / 100 cm3, and c) 0 wt.% to 99 wt.% of one or more hydrophobic monomers with a water solubility of 0.3 g / 100 cm3 or less, wherein the copolymer emulsion (1) comprises d) 0.2 wt.% to 20 wt.% of one or more stabilizers, wherein the content of the hydrophilic monomer b) or the hydrophobic monomer c) is at least 0.5 wt.%, and wherein at least 5 wt.% of the methyl methacrylate a) (MMA) is recycled methyl methacrylate (2r, rMMA), and the remainder is standard methyl methacrylate (2s, MMA). A method for emulsion copolymerization of recycled methyl methacrylate (2r, rMMA) to obtain a low-VOC water-based copolymer emulsion (1a), the water-based copolymer emulsion (1a) obtainable according to said method, and the use of the obtained low-VOC water-based copolymer emulsion (1a) are also claimed.

This invention discloses a fatigue-resistant rubber for automotive inner tubes and its preparation method, relating to the field of rubber materials technology. The invention involves copolymerizing olefinic carbon nanotubes into polymethyl methacrylate (PMMA) chains to prepare carbon nanotube-modified PMMA. Using PMMA as the shell, and polybutyl acrylate (PBMA) as the core, modified core-shell particles are prepared through emulsion copolymerization. These modified core-shell particles are then added to an inner rubber matrix to prepare the inner layer rubber. An outer rubber layer is prepared by grafting maleic anhydride onto chlorosulfonated polyethylene rubber. The grafting of maleic anhydride introduces carboxyl groups, which form covalent bonds with adjacent layers through a chemical reaction. The adhesive layer is a composite of chlorinated polyethylene and epoxy resin, extruded using a multi-layer co-extrusion process, and then co-cured to prepare the fatigue-resistant rubber for automotive inner tubes. Co-curing allows the molecular chains of the three rubber layers to form a three-dimensional interpenetrating network through a crosslinking agent, tightly binding them through chemical bonds and completely eliminating the risk of interlayer delamination.

The application discloses a liquid type super-high cation water purifying agent for treating mine wastewater, which is prepared by stably dispersing AM-DM oil emulsion copolymer and PDM homopolymer in an oily solvent under the action of an emulsifier; the water purifying agent comprises the following components: 11-15 parts of AM-DM oil emulsion copolymer containing AM-DM copolymer, 60-65 parts of PDM homopolymer, 2-3 parts of emulsifier, and the rest is an oily solvent; the AM-DM oil emulsion copolymer is obtained by emulsifying the AM-DM copolymer in the oily solvent. The super-high cation water purifying agent can improve the molecular weight and viscosity of the water purifying agent product, and can also keep the stability and uniformity of the super-high cation charge density, is used for treating mine wastewater, can significantly improve the treatment effect, makes the supernatant of the treated wastewater clear and transparent, can greatly reduce the treatment cost, and has a positive market application value.

This invention relates to the field of sludge dewatering agent preparation technology, specifically to an environmentally friendly polymeric sludge dewatering agent and its preparation method. A quaternary ammonium salt structure is introduced into the gelatinized starch molecular chain to obtain modified cationic starch. Using an emulsion copolymerization method, the modified cationic starch, methacryloyloxyethyltrimethylammonium chloride, and modifying additives are grafted and copolymerized to obtain a pretreated polymer. Then, modified fillers are introduced through covalent bonds to obtain the environmentally friendly polymeric sludge dewatering agent. The dewatering agent has both positive and negative charges on its surface. The positive charge can combine with negatively charged organic suspended matter, while the negative charge can accelerate the settling of inorganic suspended matter. The inorganic silica-alumina skeleton and metal-organic framework support the floc structure, forming large and dense flocs, thus increasing the settling velocity. Simultaneously, the long-chain alkanes on it enhance the interaction between polymer molecular chains through hydrophobic association, improving adsorption bridging and flocculation effects.

This invention discloses a modified tea saponin-based antifouling emulsion, its preparation method, and its application. The method includes: firstly, grafting C12-C22 long-chain unsaturated acyl chlorides, acid anhydrides, or isocyanates onto tea saponin molecules using a one-pot method to prepare unsaturated modified tea saponin monomers; then, semi-continuous emulsion copolymerizing these monomers with styrene, (meth)acrylate, and functional carboxylic acid monomers. This invention anchors the antifouling active sites of tea saponin to the polymer backbone via covalent bonds, combining the steric hindrance and repulsion forces generated by the long carbon chains in seawater with their lipid affinity and penetration effect on the cell membranes of attached organisms, achieving synergistic antifouling through physical anti-adhesion and biochemical inhibition. This invention overcomes the shortcomings of traditional physically additive antifouling agents, such as easy leaching and short-lasting antifouling effects. It does not release heavy metals and has the advantages of long-lasting effect, being environmentally friendly, and having a simple process, showing broad application prospects in the field of marine antifouling.