43results about How to "Avoid self-polymerization" patented technology

The invention relates to a preparation method for anti-pilling, anti-ageing and normal-pressure cation dyeable polyester chips. The preparation method comprises procedures of primary esterification, transesterification, secondary esterification and polymerization, wherein three monomers are added in the transesterification procedure; a hindered amine light stabilizer, a hindered phenol antioxidant and hydroxyl silicon oil are added after the secondary esterification and before prepolymerization; and the polyester slices are precrystallized and dried before the spinning procedure. A fabric prepared from fibers spun by the polyester chips has a high anti-pilling property and high light fastness; the polyester fibers can be dyed with various bright colors due to the normal-pressure cation dyeable property; the unified requirement of high-grade spring and summer clothing at present on functionality and color is met; and the polyester fibers and wool can be dyed in the same bath and a good clothing effect of the fibers blended with the wool is achieved. The polyester fibers spun by the polyester chips are important supplement for the cation dyeable polyester fiber market at present and have wide market prospect.

The invention discloses a fulvic acid type three-dimensional network composite material, and a preparation method and application thereof, and belongs to the technical field of material preparation and environment treatment. The fulvic acid type three-dimensional network composite material is prepared by dissolving fulvic acid and natural macromolecules, adding a cross-linking agent and an initiating agent, adding polyethylene glycol dropwise under the condition of heating, and stirring and drying. The fulvic acid is a high molecular organic acid which consists of aromatic groups and various functional groups thereof, is natural and degradable, and has good physiological activity and the functions of adsorbing, absorbing, complexing, exchanging and the like. The formed porous structure canenhance the adsorbing or complexing actions on heavy metal ion particulate matters. When the composite material is used for pollution treatment and ecological remediation, heavy metals in a water body and land can be adsorbed; after the adsorption is completed, the composite material can also be used as soil fertilizer to improve soil structure, restore ecological balance and reduce chemical pollution.

The invention provides a preparation method of modified polylactic acid. The method comprises the following steps: irradiating polylactic acid at the air atmosphere; and carrying out grafting reaction on the irradiated polylactic acid with an auxiliary and a monomer containing a double bond in a solvent so as to obtain the modified polylactic acid, wherein the temperature of the grafting reaction is above 30 DEG C. After the polylactic acid is irradiated at the air atmosphere, stable peroxide is formed on the molecular chain of the polylactic acid; when the irradiated polylactic acid is heated, the peroxide forms the macromolecule radial of the polylactic acid to be used as an initiator for initiating the monomer containing the double bond to be subjected to the grafting polymerization on the macromolecule of the polylactic acid, so that the modified polylactic acid is obtained. The polylactic acid is directly irradiated at the air atmosphere, thus the process requirement is low, and the cost is also reduced; and the irradiated polylactic acid and the monomer containing the double bond are subjected to the grafting reaction in the solvent, and the auxiliary can be used for preventing the monomer containing the double bond from being subjected to self-polymerization reaction and further generating a homopolymer.

The invention relates to the technical field of printing ink, and particularly relates to a waterborne binder and food-contact waterborne printing ink prepared by using the waterborne binder. The waterborne binder comprises the following raw materials in parts by weight: 15-20 parts of modified rosin, 5-15 parts of starch, 0.5-5 parts of emulsifying monomers, 0.5-5 parts of an initiator, 0.1-2 parts of a pH regulator and 40-60 parts of water, wherein each part of the emulsifying monomers is prepared by the following method: stirring 70-90 parts of acrylic monomers and/or styrene monomers, 0.5-5 parts of an emulsifier and 20-30 parts of water at a temperature of 30-45 DEG C to obtain the emulsifying monomers. According to the waterborne binder, the harm of the use of organic solvents to thehealth of human bodies is avoided, and compared with the existing waterborne acrylic resin, the waterborne binder is more environmentally friendly and is harmless to the human bodies.

The invention provides a continuous production process and a continuous production device of an emulsion polymer and application of the continuous production process and the continuous production device. An emulsion is prepared firstly, then the emulsion and an oxidant are mixed and conveyed to a tubular continuous reactor, and simultaneously a reductant is separately input, so that early polymerization can be prevented. The tubular continuous reactor disclosed by the invention has stirring and back-mixing effects inside, and is suitable for a continuous production process of a high-viscosityemulsion system; according to the process, the emulsion is conveyed into the reactor from the bottom of the tubular continuous reactor through a pump, the composite oxidant is added to a feeding pipeline, the reductant is added to the bottom of the reactor, then a liquid is gradually pumped to the reactor pipeline and discharged out of the top of the reactor through the pump, early polymerizationis avoided, continuous polymerization is ensured, and the stability of products is improved.

The invention discloses an iron porphyrin-flaky bismuth tungstate two-dimensional composite material and a preparation method thereof, wherein the iron porphyrin-flaky bismuth tungstate two-dimensional composite material comprises iron porphyrin and flaky bismuth tungstate, and the iron porphyrin is immobilized on the surface of the flaky bismuth tungstate. The preparation method comprises: preparing a mixed solution of bismuth nitrate and sodium tungstate; preparing a precursor mixed solution; and carrying out a hydrothermal reaction on the precursor mixed solution. According to the present invention, the iron porphyrin-flaky bismuth tungstate two-dimensional composite material has advantages of good dispersibility, strong stability, easy recovery and reuse, excellent photocatalytic performance, environmental friendliness and the like, can efficiently degrade pollutants (such as antibiotics) in environment without the adding of H2O2, has good photocatalytic degradation effect, can significantly reduce the treatment cost, and has good application prospects and application range in the field of photocatalysis; and the preparation method has advantages of mild reaction conditions, simple process flow and environmental protection.

The invention relates to the technical field of chemical production, in particular to a method and a system for preparing polymer polyol. The method for preparing the polymer polyol comprises the following steps: uniformly mixing the raw materials except the basic polyether, and then mixing with the basic polyether to carry out polymerization reaction. The raw materials except the basic polyetherare uniformly mixed and then mixed with the basic polyether, so that on one hand, the material cooling time can be shortened, the production period is shortened, the production efficiency is improved,and on the other hand, the batching frequency and the labor intensity of workers can be reduced; and the self-polymerization reaction of the raw materials except the basic polyether can be prevented,so that impurities in the polymer polyol can be reduced, the quality of the polymer polyol can be improved, a pipeline can be prevented from being blocked by a product produced by a self-polymerization reaction, and meanwhile, the situation that a part of raw materials volatilize due to the fact that the temperature of the basic polyether is higher than the boiling point of the raw materials except the basic polyether can be avoided.

The invention belongs to the technical field of catalysis, and particularly relates to a preparation method and application of a bifunctional catalyst for high-selectivity preparation of isobutyraldehyde by propylene hydroformylation. According to the characteristics of an isobutyraldehyde product, propylene is firstly adsorbed on a rare earth modified acidic carrier to generate secondary positivecarbon ions, then the secondary positive carbon ions are subjected to addition with CO on active center cobalt carbide, and finally the product is generated through addition with active hydrogen. Thebifunctional catalyst is prepared by the steps of dipping cobalt salt and a nitrogen-containing compound precursor into acidic molecular sieve pores, carbonizing at a relatively high temperature, generating active center cobalt carbide highly dispersed in the molecular sieve pores in situ, and generating an N-modified carbon layer on the surface of the cobalt carbide. The carrier in the catalystplays an acidic role, and cobalt carbide activates CO and H2 at the same time. The prepared catalyst enables the yield of isobutyraldehyde to be as high as 79%. The catalyst prepared by the method islow in cost, high in activity, good in catalyst stability and high in isobutyraldehyde selectivity, and has a good industrial prospect.

The invention provides an industrial production process for preparing high-purity cyclopentadiene by depolymerizing dicyclopentadiene. Dicyclopentadiene is used as a raw material; adding the diluent 1and the polymerization inhibitor 1 into dicyclopentadiene and uniformly mixing; then carrying out depolymerization, rectification and separation in a reactive distillation tower 1; collecting crude cyclopentadiene at the top of a tower, then adding the crude cyclopentadiene, a diluent 2 and a polymerization inhibitor 2 into an evaporation kettle, carrying out heating vaporization, feeding steam through a cracking tube, carrying out tubular cracking, carrying out secondary depolymerization distillation separation in a reaction distillation tower 2 after cracking, and collecting high-purity cyclopentadiene at the top of the tower. The process solves the problems of coking, blasting boiling and low purity in the existing process, obtains high-purity cyclopentadiene, has higher yield and hashigher industrial application value.

The invention belongs to the technical field of leucocyte filtering and particularly relates to a modification method of a leucocyte filtering membrane. The modification method includes: completely soaking washed PBT nonwoven fabric into an ethanol solution containing benzophenone and polyalkyl glycol allyl epoxyl ether, then soaking into an ethanol solution containing methacrylic acid-2-hydroxyethyl and polyalkyl glycol allyl epoxyl ether, performing ultraviolet irradiation after the soaking, and allowing the irradiated PBT nonwoven fabric to have reaction with a silane coupling agent to obtain the leucocyte filtering membrane. The leucocyte filtering membrane prepared by the method is high in grafting rate and free of hemolysis, has an evident protecting effect on erythrocytes and has anefficient filtration effect on leukocytes and thrombocytes in whole blood.

The invention relates to a PU adhesive for single-component microfiber leather and a preparation method of the PU adhesive. The preparation method comprises the following steps: adding polyester polyol into a reaction bottle, heating to melt the polyester polyol, adding an antioxidant BHT and phosphoric acid, uniformly stirring, adding molten isocyanate, reacting at 110 DEG C, adding an organic solvent in the reaction process for dilution, and reacting until the viscosity of the system reaches 80,000-120,000 cps/DEG C; and adding another organic solvent into the reaction bottle so as to adjustthe solid content of the system to 40%, continuously stirring for 1 hour, and packaging. The PU adhesive for the single-component microfiber leather prepared by the scheme has the advantages of simple process, convenience in operation and the like; the prepared PU adhesive is low in softening point, has good hydrolysis resistance, heat resistance and mildew resistance and is suitable for dry sticking, and when the PU adhesive is used for microfiber veneering, the matte phenomenon is avoided.

The invention discloses a preparation technology of a polypropylene foaming special-purpose material of a sorbitol acetal compound. The polypropylene foaming special-purpose material comprises, by weight, 100 parts of polypropylene, 0.1-0.7 parts of an initiator, 0.1-1 part of a sorbitol acetal compound and 0.05-1 part of a benzenoid aromatic hydrocarbon grafted monomer. A volume ratio of the benzenoid aromatic hydrocarbon grafted monomer to a solvent is 1-15. The preparation technology comprises feeding polypropylene into an extruder through a main feed inlet, feeding the initiator and the sorbitol acetal compound into the extruder through an auxiliary feed system, dissolving the benzenoid aromatic hydrocarbon grafted monomer in the solvent, feeding the solution into the extruder through a liquid feed inlet, simultaneously, starting a vacuum pump at the tail of the extruder, pumping the solvent and the unreacted grafted monomer and carrying out reactive extrusion, cooling and granulation to obtain the polypropylene foaming special-purpose material. The preparation technology has simple processes, can be operated flexibly and is suitable for continuous industrial production of the polypropylene foaming special-purpose material with high melt strength and excellent processing fluidity.

The invention provides a method for catalytically preparing nonylated diphenylamine. The nonylated diphenylamine product is prepared through carrying out an alkylation reaction on diphenylamine and excessive nonylene in the presence of a composite catalyst system. A composite catalyst is prepared from the following catalyzing components: a catalyzing component A, a catalyzing component B and a flaky nano-alumina cocatalyst, wherein the catalyzing component A is selected from mesoporous silicon dioxide loaded alkyl imidazolium salt and aluminum chloride ionic liquid, the catalyzing component Bis selected from molecular sieve loaded heteropolyacid catalyst, and the content of dinonyl diphenylamine in the nonylated diphenylamine product is higher than 85%. According to the method provided bythe invention, the yield of dinonylated diphenylamine can be effectively increased, a chlorine element is hardly remained, and the quality of the antioxidant product is improved.

The invention discloses a chemical anti-sagging exposed type single-component polyurethane waterproof coating and a preparation method of the chemical anti-sagging exposed type single-component polyurethane waterproof coating. The high-temperature-resistant polyurethane adhesive is prepared from components in parts by weight as follows: 20-40 parts of polyether, 5-20 parts of a plasticizer, 30-50 parts of pigment filler, 0.3-2 parts of a weather-resistant aid, 0.1-0.5 parts of a pH value regulator, 1-5 parts of a drying agent, 1-5 parts of a water removal agent, 5-10 parts of isocyanate, 0.2-2 parts of a catalyst, 5-10 parts of alkane oil, 0.2-1 part of a chain extension cross-linking agent and 0.6-3 parts of a dissolving agent. The single-component polyurethane waterproof coating has the advantages of high strength, compact coating film, no sagging after being brushed for 24 hours at the thickness of 2mm in one-time facade construction, labor-saving in construction and blade coating, excellent physical properties and weather resistance, can be applied to exposed construction, and expands the application range of the polyurethane waterproof coating in the field of building waterproofing.