113 results about "Ketenimine" patented technology

The invention relates to a single-component epoxy primer and a preparation method thereof. The epoxy primer disclosed by the invention is a single-component system, and is prepared from the following raw materials in parts by weight: 100 parts of epoxy resin, 30-70 parts of ketimine curing agent, 30-100 parts of solvent, 10-20 parts of rutile SiO2, 20-30 parts of anti-rust pigment, 5-10 parts of mica powder, 3-8 parts of silane coupling agent, 2-6 parts of gaseous phase SiO2, 2-7 parts of dispersant, 0.5-5 parts of flatting agent and 0.5-5 parts of defoamer. The single-component epoxy primer is mainly applied to the primers with smooth substrate (galvanized plate, tin plate, aluminum alloy and the like) surfaces, the coating has excellent adhesive force, flexibility and penetration resistance, a firm adhesive force is provided for a heavy-duty composite coating, and the single-component epoxy primer has the characteristics of being convenient in single component use, cured at room temperature and the like.

The invention relates to a preparation method of a functional polycarboxylate-type water reducing agent for resisting a flocculating agent in machine-made sand. The preparation method comprises the following specific steps: firstly, modifying imide under the action of an amine catalyst to obtain o-phenyl ketene imide; then enabling ketene imine, an unsaturated carboxylic acid derivative and an oxidizing agent to be subjected to an in-situ polymerization reaction in molten polyethylene glycol monomethyl ether, adding alkyl halide after the reaction is completed, performing a Delepine reaction, and obtaining the functional polycarboxylic acid water reducing agent. The functional polycarboxylate-type water reducing agent for resisting the flocculating agent in the machine-made sand prepared by the method disclosed by the invention can eliminate the influence of the flocculating agent in the machine-made sand on the dispersion performance of concrete, and ensures the working performance, the mechanical property and the durability of the concrete.

The invention relates to solvent-free type fiber reinforced epoxy paint and a preparation method of the solvent-free type fiber reinforced epoxy paint. The solvent-free type fiber reinforced epoxy paint comprises an ingredient A and an ingredient B, wherein the ingredient A mainly comprises the following ingredients in parts by weight: 20 to 50 parts of liquid epoxy resin, 5 to 20 parts of reactive diluents, 10 to 40 parts of titanium pigment, 10 to 40 parts of toughening agents, 10 to 30 parts of fillings and 4 to 10 parts of adhesion promoters, the ingredient B comprises the following ingredients in parts by weight: 20 to 60 parts of cashew modified amine, 20 to 60 parts of ketimine, 0.5 to 1.5 parts of adhesion promoters and 5 to 20 parts of active diluents, and the weight ratio of the ingredient A to the ingredient B is (4.5-5.5):1. The solvent-free type fiber reinforced epoxy paint is economic and environmental-friendly, the toughness is high, and wider industrial application prospects are realized.

The invention discloses preparation of substituted saturated hydrocarbon and particularly relates to a synthesizing method of 2-nitropropane. The 2-nitropropane is prepared by oxidizing isohydrazone. The synthesizing method includes the steps of S1, condensing acetone, water and ammonia in the presence of a catalyst to generate ketimine, wherein the mass ratio of the acetone to the water is 1:(1-5), and the use amount of the catalyst is 5-11% of the use amount of the acetone; S2, oxidizing the ketimine obtained in the step S1 to form the isohydrazone, wherein reaction system temperature is 30-60 DEG C and heat-preservation reaction time is 0.5-3 hours; S3, oxidizing the isohydrazone obtained in the step S2 to form the 2-nitropropane, wherein reaction system temperature is 50-80 DEG C and heat-preservation reaction time is 0.5-3 hours; rectifying obtained primary reaction liquid to obtain qualified 2-nitropropane products. The synthesizing method has the advantages that the acetone, the ammonia and the water are used as the initial raw materials, and the method is mild in catalytic oxidizing reaction condition, simple in process, convenient to operate, suitable for large-batch 2-nitropropane production, simple in post-processing and high in product purity and does not coproduce acetone oxime or acetone azine.