50results about How to "Low gel rate" patented technology

The invention relates to a polyester modified core shell self crosslinking styrene-acrylate emulsion and a preparation method thereof and an anticorrosion coating therewith, wherein polyester with multi-branched structure and containing carboxyl is introduced into the core shell of the latex particle of the styrene-acrylate emulsion; the Tg of the shell layer is -30-0 DEG C and the Tg of the corelayer is 10-80 DEG C; in a monomer composing the core layer of the latex particle, a functional monomer containing glycidyl accounts for 0.5-3 percent; and in a monomer composing the shell layer of the latex particle, polyester accounts for 5-20 percent, and a functional monomer containing carboxyl accounts for 1.5-5 percent. The stability of calcium ions in the emulsion is obviously improved; and the anticorrosion coating containing the styrene-acrylate emulsion has the formula (by weight parts): 40-50 of the styrene-acrylate emulsion, 10-30 of ferrotitanium powder, 20 of iron oxide red, 12-20 of kaolin, 10-30 of bentonite and 0.1-1 of dispersing agent. The compactness and hardness and the compositive corrosion resistance of the coating are obviously improved for the polyester introducedinto the latex particle and the self crosslinking structure.

The invention discloses a preparation method of ingrain fireproofing type acrylate emulsion. The preparation method of the ingrain fireproofing type acrylate emulsion comprises the following steps: adding vinyl silane into ethyl alcohol dispersed with metal hydroxide flame retardant particles for reacting, so that vinyl silane is grafted on the surfaces of the metal hydroxide flame retardant particles, namely flame retardant metal hydroxide functional monomers are obtained; and carrying out emulsion polymerization on the flame retardant metal hydroxide functional monomers and polymeric monomers including acrylic acid monomers and / or acrylate monomers, so that the ingrain fireproofing type acrylate emulsion with high solid content, low gel rate and good stability is obtained. The ingrain fireproofing type acrylate emulsion can be used for preparing latex paint with good flame retardant property and mechanical properties.

[Object] In manufacturing a GRIN lens by a sol-gel method, an operation for preparing a wet gel is facilitated and cracking in a base material during sintering and foaming during drawing are prevented.[Solution] The object is achieved by obtaining a GRIN lens by producing a wet gel from an alcohol solution containing a silicon alkoxide, a dopant alkoxide, and a boron alkoxide as the main ingredients, leaching the same, drying the same to form a dry gel, and sintering and drawing the same.

The invention relates to the field of technologies for polymerizing emulsion, in particular to a method for preparing fluorine-containing pure acrylic emulsion. The method includes mixing emulsifiers, hard monomers, soft monomers, functional monomers, fluorine-containing monomers, water-soluble thermal initiators, chelating agents and entanglement molecular weight regulators with one another to obtain mixtures and stirring the mixtures; shearing the mixtures at high stirring speeds of 800-1000 rpm; carrying out reaction; adding inhibitors into the mixtures and terminating the reaction. The method has the advantages that the water-soluble fluorine-containing pure acrylic emulsion is prepared by means of polymerizing emulsion free radical, technological reaction steps are simple, applied chemicals are clean and environmentally friendly, the method is high in monomer conversion rate and low in gel rate, and the fluorine-containing pure acrylic emulsion is uniform in particle size distribution and is in a stable state; the fluorine-containing pure acrylic emulsion can be used for gluing the surfaces of paper, so that the waterproof, oil-proof and surface strength performance and the like of the paper can be obviously improved.

The invention discloses a nano particle type in-situ initiator, a preparation method and application thereof. The preparation method of the present invention comprises: first reacting γ-isocyanatopropyl triethoxysilane and sodium bisulfite for 30 to 35 minutes, using ethanol as a solvent and hydrolysis inhibitor, then adding ammonia and nano silicon dioxide to react after heating up. ~4 hours, then centrifuged and rinsed with ethanol, dried to obtain the nanoparticle-based in situ initiator. In the present invention, through the chemical modification of nano-silica particles, the surface has initiator activity. During the in-situ miniemulsion polymerization process, the nano-particle initiator can initiate acrylate polymerization, so that the acrylate polymer is directly grafted on the particles. Surface, thereby reducing the gel rate, improving the water resistance and mechanical strength of the resin.

The invention belongs to the technical field of polymer materials, and in particular relates to a modified vinyl ester resin and a preparation method thereof, a toughened modified vinyl ester resin with good air-drying property, a preparation method and application thereof. In the present invention, after the epoxy resin and the diisocyanate are chain-extended under the catalyst, the unsaturated monobasic acid is used to react with the epoxy group, and after the reaction is completed, an active diluent is added to obtain the modified vinyl ester resin; the vegetable oil-based oligomer and The modified vinyl ester resin is mixed in proportion to obtain a toughened modified vinyl ester resin with good air-drying properties. The modified vinyl ester resin and the toughened and modified vinyl ester resin with good air-drying properties not only have good air-drying properties and fast curing speed, but also have excellent mechanical properties and corrosion resistance.