50results about How to "Reduce gel" patented technology

A Ziegler-Natta catalyst composition comprising a solid mixture formed by halogenation of: Al) a spray-dried catalyst precursor comprising the reaction product of a magnesium compound, a non-metallocene titanium compound, and at least one non-metallocene compound of a transition metal other than titanium, with A2) an organoaluminium halide halogenating agent, a method of preparing, precursors for use therein, and olefin polymerization processes using the same.

Disclosed is a polyamide resin composition comprising a resin component containing at least a polyamide (X) and a fatty acid metal salt having 10-50 carbon atoms. This polyamide resin composition may optionally contain an additive (A) and/or an additive (B). The polyamide (X) is obtained by melt polycondensation of a diamine component containing not less than 70 mol% of meta-xylylenediamine and a dicarboxylic acid component containing not less than 70 mol% of an alpha,omega-linear aliphatic dicarboxylic acid. The additive (A) is composed of one or more compounds selected from the group consisting of diamide compounds obtained from a fatty acid having 8-30 carbon atoms and a diamine having 2-10 carbon atoms, diester compounds obtained from a fatty acid having 8-30 carbon atoms and a diol having 2-10 carbon atoms, and surface active agents. The additive (B) is composed of one or more compounds selected from the group consisting of metal hydroxides, metal acetates, metal alkoxides, metal carbonates, and fatty acids.

The invention relates to a preparing method of a high-branch type polyvinyl alcohol-acrylamide graft copolymer. The preparing method includes: dissolving polyvinyl alcohol with water, feeding nitrogen, cooling, adding a catalyst, reacting for 10-30 min, adding dropwise a monomer mixture solution with the adding time being controlled to be 30-90 min and the reaction temperature during addition being controlled to be 65-95 DEG C, reacting at 85-95 DEG C for 20-30 min after the addition is finished, adding the catalyst, reacting at 80-95 DEG C for 15-25 min, adding the catalyst, sampling in the reaction process and measuring viscosity, adding a terminating agent when the viscosity at 25 DEG C reaches 1500-15000 mPa*s to stop the reaction, and adjusting the solid content. The graft copolymer has characteristics of high molecular weight, more branches, low viscosity, less gel, good retention property, and high interference resistance to hetero-ion, and can achieve satisfied enhancing effects even when being used as a papermaking dry strength agent in a bad high-temperature high-conductivity environment for manufacturing paper with pulp.

The invention relates to a method and equipment for nylon 66 short-flow continuous polymerization. The method comprises the steps of carrying out heating, evaporation, concentration and polycondensation of 30-70% of a nylon 66 salt solution in a normal pressure pre-polypolycondensation tower by adopting a reaction distillation method to obtain a prepolymer with a polymerization degree of 5-50 (preferably 20-40) and equimolar terminal carboxy group and terminal amine group, and allowing the prepolyer to directly produce a polymer with a polymerization degree meeting technical indicators without flash distillation. A falling film devolatilization method is adopted in the polycondensation kettle to accelerate distillation out of condensation water, reduce reaction temperature, shorten reaction time and reduce gel; and the falling liquid film is used to seal and cover the kettle wall to avoid scarring of the kettle wall. Compared with the traditional nylon 66 continuous polymerization device, the method and the equipment provided by the invention has the advantages of short process, large single line scale, less investment, low operating cost, good product quality, long continuous operation cycle, and environmental friendliness.

A method for the improved extrusion of polyethylene polymers comprising passing polyethylene through a single stage, twin screw extruder comprising a solid polymer conveying zone, a polymer melting zone, a dispersive mixing zone, and a distributive mixing/pumping zone, in which the throughput and screw speed are optimized to reduce the number of gels present, ensure complete polymer melting within the polymer melting zone, and to minimize polymer degradation.

The invention relates to a preparation method of a viscosity-controllable polyamide acid solution for preparation of polyimide fibers. The preparation method mainly solves the problem that in the two-step polyimide fiber preparation method, a polyamide acid solution has unstable viscosity, overtop molecular weight, overtop viscosity and poor spinnability in preparation. The preparation method comprises that diamine as a polymerization raw material, a solvent and a conditioning agent are added into a reactor and are dissolved in a protective atmosphere of gas inert to the reaction substances, tetracarboxylic dianhydride is added into the solution at a temperature of -10 to 40 DEG C, the mixture undergoes a reaction for 2-10h and the reaction product is defoamed so that a polyamide acid spinning stock solution is obtained. The preparation method well solves the above problem and can be used for polyimide fiber industrial production.

The invention relates to an application method of a solvent type polymethacrylate pressure-sensitive adhesive. The method comprises the following steps: step 1, preparing adhesive diluent from a solvent type polymethacrylatepressure-sensitive adhesive and a solvent; step 2, dissolving a water reducing agent of which the mass percentage accounts for 0.5 percent to 5 percent of the dry weight mass of the solvent type polymethacrylate pressure-sensitive adhesive with the solvent, then adding into the adhesive diluent; steps 3, mixing an isocyanate curing agent with the solvent, adding into the adhesive diluent; step 4, adding a catalyst of which the mass percentage accounts for 0.01 percent to 1 percent of the dry weight mass of the solvent type polymethacrylate pressure-sensitive adhesive into the liquid prepared in the step 3, and obtaining adhesive coating liquid; step 5, adding a volatile organic acid substance which accounts for 1 percent to 5 percent of the dry weight mass of the polymethacrylate pressure-sensitive adhesive into the adhesive liquid under a state of being stirred; step 6, coating a substrate surface with the adhesive coating liquid, and performing solvent removal, solidification and post curing in an oven, so that an adhesive product is obtained.

The invention discloses an isomeric alcohol block polyether with excellent degreasing emulsion performance and a preparation method and application of the isomeric alcohol block polyether. The isomeric alcohol block polyether is of a chemical structure of a formula I shown in the specification, in the formula, R is selected from isomeric alkyl of which the average isomerization degree is greater than or equal to 2, n is selected from numbers of 1-8, and m is selected from a number of 2-15. The preparation method comprises the following steps: performing a polymerization reaction on isomeric alcohol R-OH and epoxypropane so as to obtain an intermediate, and performing a polymerization reaction on the obtained intermediate and ethylene oxide so as to obtain the isomeric alcohol block polyether. The obtained isomeric alcohol block polyether has the characteristics of being low in pour point, free of gel, low in foam and excellent in emulsification and degreasing capability, and a degreasing agent and emulsifier raw material with good operability can be provided for the market.

The invention discloses a dispersing agent, positive electrode slurry and a lithium ion battery. In the application, the dispersing agent is prepared from polyacrylonitrile and polystyrene; or the dispersing agent comprises a first copolymer, and the first copolymer is formed by copolymerization of an acrylonitrile monomer and a styrene monomer. When the dispersing agent is added into positive electrode slurry, the phenomena of material gelling and agglomeration in the slurry homogenizing process can be reduced, the viscosity of the slurry is reduced, and the stability of the slurry is improved; therefore, the dispersing capacity of the positive electrode material is improved, and the slurry viscosity is reduced.

The invention relates to a thermal-insulation energy-saving coating and a preparation method thereof; the thermal-insulation energy-saving coating comprises a first coating agent which is used for coating a wall body to form a thermal-insulation base layer, and a second coating agent which is used for coating the thermal-insulation base layer to form a thermal-insulation protective layer, wherein the first coating agent is prepared from an acrylic emulsion, deionized water, propylene glycol, a resin material, nano titanium dioxide, 3-glycidyl propoxy trimethoxy siloxane, Na-montmorillonite, phosphoric acid, nano aerogel, ferrocene boric acid, xonotlite whiskers and an auxiliary agent. The first coating agent is coated to form a heat-insulating base layer, and the second coating agent is coated to form a heat-insulating protective layer. The heat preservation base layer and the heat preservation protection layer are combined to form good heat preservation performance, and the heat preservation protection layer protects the heat preservation base layer. Therefore, the damage of the thermal insulation base layer after long-term use is reduced, and the stability of thermal insulation performance is ensured.

The present invention relates to a method of producing a non-dairy frozen confectionery, the method comprising the steps of: 1) providing a grain based ingredient mix comprising plant syrup and having 20-40 wt. % solids, pasteurizing the grain based ingredient mix, fermenting the pasteurized grain based mix with a culture, and cooling the fermented grain ingredient based ingredient mix, and 2) providing a nut and/or seed based ingredient mix comprising 40-60 wt. % solids and 3) combining it with the cooled fermented grain based ingredient mix, and freezing while optionally aerating the combined grain and nut and/or seed based mixes, to form a frozen confectionery. The invention also relates to a non-dairy frozen confectionery comprising 3-20 wt. % grain fermented with Streptococcus thermophilus, and 4-40 wt. % seed and/or nuts.

The invention discloses functional master-batch for an organosilane crosslinked polyethylene pipe, and a preparation method and application of functional master-batch, which belong to the technical field of master-batch for engineering plastics. 100 parts of high density polyethylene, 25-35 parts of an adsorbing agent, 5-10 parts of a lubricating agent, 2-5 parts of an antioxidant, 2-5 parts of a light stabilizer and 3-6 parts of a crosslinking accelerant are stirred through a high stirring machine, subjected to twin-screw extrusion, pelleted and the like to obtain the functional master-batch; and the functional master-batch is used for extrusion molding of the large-caliber organosilane crosslinked polyethylene pipe. The preparation method of the functional master-batch is simple and suitable for industrial production; the method is applied to the extrusion molding of the large-caliber organosilane crosslinked polyethylene pipe; the pipe processing stability is good; the extension rate and the self-crosslinking speed of the obtained pipe are far better than those of a common pipe; and the functional master-batch facilitates a pipe manufacturer and can be added according to different devices and pipe specifications, and 2-5% of the master-batch can be added directly into a common silane crosslinking material, so that a pipe can be extruded after uniform stirring.