172results about How to "High monomer conversion rate" patented technology

The invention disclose a filter paper impregnating emulsion in the automotive industry and a method for modifying the filter paper impregnating emulsion by using a polymeric emulsifier, and relates to a filter paper water-soluble impregnated resin in the automotive industry and the method for modifying the filter paper impregnating emulsion in the automotive industry by using the polymeric emulsifier. The emulsion of the invention comprises the polymeric emulsifier of 0.5 percent to 4 percent, a general emulsifier of 0 to 3 percent, hard-monomer styrene of 40 percent to 55 percent, soft-monomer acrylic ester of 40 percent to 55 percent, crosslinking monomer of 2 percent to 5 percent, and functional monomer of 2 percent to 10 percent according to the mixture ratio of the mass percent. The invention has the modification method that: the hard-monomer, the soft-monomer, the crosslinking monomer and the functional monomer are used as a copolymer, and the automobile air filter paper water-soluble impregnated resin is synthetized through a semicontinuous pre-emulsification emulsion polymerization method. The invention greatly enhances the hydrolytic resistance, solvent resistance and strength character of the filter paper after the impregnating in the water-soluble resin, lowers the emulsion manufacturing cost, and reduces the environment pollution caused by dissociative emulsifier after the general emulsion is applied. The invention has the advantages of high monomer percent conversion, stable emulsion, etc.

A free radical radiation curable inkjet ink having a viscosity smaller than 30 mPa·s at 40° C. and at a shear rate of 1,000 s−1 includes a polymeric or polymerizable photoinitiator; a thiol compound; and a vitrification control monomer. The vitrification control monomer includes a (meth)acrylate group and an ethylenically unsaturated functional group selected from the group consisting of a vinyl ether group, an allyl ether group, and an allyl ester group, and the thiol compound includes no more than six thiol groups.

The invention discloses a preparation method of an organic high-polymer flocculant, and a preparation method and application of an inorganic-organic high-polymer composite coagulant. The preparation method of the organic high-polymer flocculant comprises the following step: in the presence of an initiator and a chelator, carrying out solution polymerization on dimethyl diallyl ammonium chloride monomer to obtain a polydimethyl diallyl ammonium chloride colloidal solution which is the organic high-polymer flocculant. The preparation method of the composite coagulant comprises the following steps: 1) heating and mixing a polyferric sulfate solution with the colloidal solution to obtain a colloid mixed solution; and 2) keeping the temperature, and dispersing until the mixed solution forms a homogeneous system. The invention also discloses application of at least one of the prepared flocculant and inorganic-organic high-polymer composite coagulant in coagulative purification or sludge dewatering treatment of polluted water bodies. The technique is simple, and the prepared composite flocculant has favorable effect. The flocculant and coagulant can be used for micropolluted water source-water coagulative purification, special wastewater treatment, sludge dewatering and the like, and are simple and quick to operate.

A process for preparing a branched polymer, belonging to the fields of polymer synthesis and preparation of functional polymers. A vinyl monomer, such as styrene, toluene (benzene, xylene) as a solvent, is subjected to a self-initiated free radical polymerization at 60˜100° C. with a new type of compound (methyl (meth)acrylate peroxide) as the initiator and the branched monomer containing both polymerisable double bond and peroxide bond, which can be used to synthesize the branched polymers. The degree of branching of the polymer can be adjusted by adjusting the molar ratio of the new type of compound to polymerisable monomer. The process for preparing a branched polymer is carried out under the conditions of conventional free radical polymerization without the addition of the branched monomer and other assist initiators. The polymerization is simple and feasible, has a high monomer conversion, a controllable degree of branching for the polymer, and is highly suitable for synthesizing branched polymers from various monomers. Another advantage of this process is its low production cost.

The invention discloses a styrene-acrylic waterproof latex and a preparation method thereof. The latex comprises the following raw materials in parts by weight: 20-30 parts of styrene, 10-18 parts ofmethyl methacrylate, 12-20 parts of methyl acrylate, 40-50 parts of butyl acrylate, 0.2-0.8 parts of acrylic acid, 1.0-2.0 parts of acrylamide, 1-3 parts of an emulsifier, 0.5-1.5 parts of an evocating agent and 0.2-0.8 parts of a buffering agent. The waterproof latex provided by the invention has low coagulating rate and moderate viscosity, thereby effectively solving the compatibility problem between the styrene-acrylic waterproof latex and powder materials such as cement, and also solving the difficult problem of poor compatibility between a macromolecule polymer and the cement with a filmformed on the surface. The latex has super flexibility, the tensile strength and the elongation at break are much higher than the requirements in the national standard and better than the waterproof latex sold with good performance on the market, and the product quality is stable, so that the bond strength between the film and the base is ensured to be high and the performances in water resistance, alkali resistance and weather resistance are high in practical application.

A free radical radiation curable inkjet ink having a viscosity smaller than 30 mPa·s at 40° C. and at a shear rate of 1,000 s−1 includes a polymeric or polymerizable photoinitiator; a thiol compound; and a vitrification control monomer. The vitrification control monomer includes a (meth)acrylate group and an ethylenically unsaturated functional group selected from the group consisting of a vinyl ether group, an allyl ether group, and an allyl ester group, and the thiol compound includes no more than six thiol groups.

The invention discloses a method for preparing norbornene in a loop reactor. The method disclosed by the invention comprises the following steps of: (1) heating and pre-decomposing dicyclopentadiene in a heat exchanger to partially or wholly decompose the dicyclopentadiene into cyclopentadiene, wherein the temperature for heating and pre-decomposing is in a range of 120-240 DEG C and the absolute pressure is in a range of 5-30 MPa; (2) transporting the heated and pre-decomposed product of the step (1) into the loop reactor through the heat exchanger, adding ethylene into the loop reactor at the same time and reacting to obtain the norbornene, wherein the reaction conditions are as follows: the temperature is in a range of 180-300 DEG C, the absolute pressure of an outlet of the loop reactor is in a range of 5-30 MPa, the mol ratio of the ethylene to the dicyclopentadiene which is not heated and pre-decomposed is 1-20 to 1, the recycle ratio is 100-300 to 1, and the temperature and the pressure of the ethylene in the process of adding the ethylene into the loop reactor are the same as those in the reaction conditions. According to the method provided by the invention, the safety of the preparation process can be remarkably improved and higher selectivity and conversion rate of the cyclopentadiene can be realized.

A free radical or controlled radical polymerization process of atom or group transfer radical polymerization. The process comprises radically polymerizing one or more radically (co)polmerizable monomers in the presence of a polymerization system. The one or more radically (co)polymerizable monomers comprise at least one or more radically (co)polymerizable diene monomers. The polymerization system comprises: an initiator having one or more radically transferable atoms or groups; a transition metal-ligand complex catalyst, wherein the ligand comprises any C-, N-, O-, P- or S-containing ligand which coordinates with the transition metal; an optional reducing agent capable of regenerating the lower oxidation state of the transition metal catalyst; and an optional organic solvent or water capable of solubilizing the transition metal-ligand complex catalyst. (Co)polymers produced by the free radical or controlled radical polymerization process of atom or group transfer radical polymerization.

The invention discloses a preparation method of an epoxy resin / MC nylon composite material; 100 weight portions of caprolactam is taken as the reference, and the weight portions of other components are as follows: 1 portion to 50 portions of epoxy resin, 0.005 portion to 20 portions of curing agent, 0.01 portion to 5 portions of catalyst and 0.01 portion to 5 portions of activating agent; (a) under the protection of nitrogen, the epoxy resin is added into caprolactam melt to be evenly stirred; (b) the curing agent is added to pre-cure the epoxy resin under 80 DEG C to 150 DEG C; (c) the catalyst and the activating agent are added in to initiate ring opening polymerization of caprolactam anion, to obtain the epoxy resin / MC nylon composite material. The preparation method has the advantages that: 1. the method has short gelation time, high polymerization speed, high monomer conversion rate, low water absorption and the like; 2. the method improves the deformation resistance of the MC nylon substrate, so that the tensile and impact strength of the composite material are greatly improved; 3. the heat resistant performance is greatly improved; 4. the method has low production cost and simple and convenient process, and is application to industrialized production.

The invention discloses a preparation method of poly (diallyldimethylammonium chloride) as flocculating agent for treating sewage. The preparation method comprises the following steps: (1) adding an initiator, a complexing agent and ethylene glycol as a chain transfer agent in an aqueous solution of diallyldimethylammonium chloride, stirring uniformly, and feeding nitrogen to remove air in a reaction container; (2) heating reaction liquid obtained from the step (1) while stirring, and carrying out polymerization reaction; (3) heating to the temperature of 65-85 DEG C, adding the initiator in the reaction liquid again, and adding water in the reaction liquid for reaction; and (4) under protection of the nitrogen, carrying out insulation and curing to obtain the poly (diallyldimethylammonium chloride). The method is simple in process and easy to operate, the reaction temperature is convenient to control, polymerization reaction is stably carried out at low speed, products with medium and low relative molecular mass are easily obtained, and the preparation method is suitable for treatment of oilfield chemical flooding output liquid. The prepared flocculating agent for treating the sewage is high in oil removal rate, high in monomer conversion rate, good in water purification effect, low in viscosity of products and convenient to inject, and has universal applicability.

The invention relates to the technical field of resin materials, in particular to carbopol and a preparation method thereof. The carbopol is prepared by taking acrylic acid as a monomer and matching with an initiating agent, a corss-linking agent, an assistant, purified water, a solvent and activated carbon, wherein the solvent is prepared from tertiary butanol and sorbitol; the assistant is prepared from an antioxidant and a chain modifier. According to the preparation method disclosed by the invention, abnormal phenomena of wall sticking and instable acid values are effectively prevented; by utilizing the preparation method disclosed by the invention, the yield and the light transmittance of a product are better, the thickening effect is good, the odor is low, and the product also has good mechanical performance.

A free radical or controlled radical polymerization process of atom or group transfer radical polymerization. The process comprises radically polymerizing one or more radically (co)polymerizable monomers in the presence of a polymerization system. The one or more radically (co)polymerizable monomers comprise at least one or more radically (co)polymerizable diene monomers. The polymerization system comprises: an initiator having one or more radically transferable atoms or groups; a transition metal-ligand complex catalyst, wherein the ligand comprises any C-, N-, O-, P- or S-containing ligand which coordinates with the transition metal; an optional reducing agent capable of regenerating the lower oxidation state of the transition metal catalyst; and an optional organic solvent or water capable of solubilizing the transition metal-ligand complex catalyst. (Co)polymers produced by the free radical or controlled radical polymerization process of atom or group transfer radical polymerization.