9results about How to "Low gel content" patented technology

The invention relates to the technical field of tire manufacturing, in particular to application of micro-nano reclaimed rubber in preparation of solid tire core rubber or solid tire crown rubber. Compared with solid tire crown rubber and solid tire core rubber prepared by using a traditional tire reclaimed rubber technology, the micro-nano reclaimed rubber is introduced into the solid tire crown rubber or solid tire core rubber formula, so that the Mooney viscosity of the solid tire crown rubber and the solid tire core rubber is remarkably reduced; meanwhile, the energy consumption caused by the use of TRR in the preparation process is also effectively reduced, the environmental pollution is greatly reduced, and particularly, the generation of wastewater is remarkably reduced.

This invention provides a carboxylated nitrile butadiene latex, its preparation method, and its application. The carboxylated nitrile butadiene latex, by mass parts, is composed of the following raw materials: butadiene, acrylonitrile, methacrylic acid, emulsifier, dispersant, electrolyte, ferrous sulfate, reducing agent, molecular weight regulator, oxygen scavenger, initiator, and demineralized water. The emulsifier is a mixture of anionic and cationic emulsifiers; the anionic emulsifier is sodium dodecyl sulfate, and the cationic emulsifier is a glycosyl gemini cationic surfactant. The mass ratio of the anionic emulsifier to the cationic emulsifier is 1:0.05–0.1. This carboxylated nitrile butadiene latex not only has low gel content and high mechanical stability, but its preparation method is also simple and controllable, making it easy for industrial production.

The present application relates to the field of polymer manufacturing, and particularly relates to a long-chain branched modification method of rare earth isoprene rubber and / or butadiene rubber, comprising the following steps: S1. performing solution polymerization of isoprene and / or butadiene and isoprene in a non-polar solvent in the presence of a rare earth catalyst to obtain a glue solution containing active polymer molecular chains; S2. when the conversion rate of the polymerization reaction reaches 95% or more, adding a compound branched modifier to the glue solution to perform a branched reaction; wherein the compound branched modifier comprises at least one of a chloride and an alkyl halide and at least one selected from ether compounds and tertiary amine compounds. The branched modifier used in the present application has a strong branching effect, and has good solubility so as to achieve uniform mixing at a molecular level in the glue solution, significantly alleviates the gel side reaction, reduces the gel content, narrows the molecular weight distribution, significantly improves the raw rubber performance, and improves the product uniformity.

The invention discloses a bio-based thermoplastic elastomer as well as a preparation method and application thereof. The bio-based thermoplastic elastomer comprises the following raw materials in parts by weight: 100 parts of bio-based rubber, 80-200 parts of bio-based polyolefin resin, 70-130 parts of a biomass plasticizer, 10-50 parts of an auxiliary agent and 1-10 parts of a composite cross-linking agent, the biomass plasticizer comprises one or more of soybean oil, coconut oil, linseed oil and palm oil; the composite cross-linking agent is prepared from one or more of tert-butyl peroxyisopropyl carbonate, sulfur, phenolic resin, bismaleimide, diphenylsilanediol, triallyl cyanurate and 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, and the composite cross-linking agent is prepared from one or more of diphenylsilanediol, diphenylsilanediol, triallyl cyanurate and 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane; the bio-based thermoplastic elastomer has excellent high and low temperature performance and sealing performance, and also has the advantages of aging resistance, weather resistance, high mechanical strength and the like.

This invention discloses a highly elastic and resilient vinyl elastomer and its preparation method. The method includes: solution polymerization of ethylene, comonomers, and functional monomers in the presence of a catalyst to obtain a vinyl copolymer precursor; subsequently, dissolving the precursor in an organic solvent, adding a ring-closing reagent to perform an intramolecular ring-closing reaction, and adding a monofunctional end-capping agent to terminate the reaction; and obtaining the vinyl elastomer after separation, washing, and drying. By controlling the monomer feed in stages, a gradient structure is formed in the molecular chain, with ethylene-rich segments at both ends and α-olefin-rich segments in the middle. Combined with the intramolecular ring-closing structure, topological constraints are introduced, significantly improving the material's elastic recovery performance while maintaining thermoplastic processability. The resulting material exhibits a resilience of over 63%, a compression set of less than 24%, a melt strength of over 7.1 cN, and a gel content of less than 1.2%.

The invention provides a synthesis method of narrow-distribution phenolphthalein polyaryletherketone / sulfone, and belongs to the technical field of synthesis methods of polyaryletherketone / sulfone. The method comprises the following steps: adding phenolphthalein, an active double-halogenated aromatic hydrocarbon monomer, a salt-forming agent and a high-boiling-point proton-free strong polar solvent into a reaction kettle, starting stirring, raising the temperature under nitrogen purging, stopping nitrogen purging, opening a pressure reduction function, extracting air to stabilize the vacuum air pressure of a polymerization kettle to-98.5 to-93.5 kPa, maintaining a polymerization system to be slightly boiled, adjusting heat tracing of a rectifying tower, and carrying out heat tracing on the rectifying tower; the temperature of the tower top is maintained at 25-40 DEG C, the state is maintained for 0.4-0.7 h, a nitrogen switch is turned on, negative pressure pumping is stopped, after the normal pressure of the polymerization kettle is recovered, heating is carried out, a viscous polymer product is obtained, heating is stopped, and phenolphthalein-based polyaryletherketone / sulfone is obtained through aftertreatment. According to the method, under the condition that an entrainer is not used, the polyaryletherketone / sulfone with high molecular weight and narrow distribution is efficiently synthesized through cooperation of normal pressure and reduced pressure of a reaction kettle.

The invention provides high-temperature-resistant polyamide as well as a preparation method and application thereof. The preparation method of the high-temperature-resistant polyamide comprises the following steps: sequentially carrying out prepolymerization and solid-phase polymerization on polyamide salt; wherein the reaction temperature of the prepolymerization is 180 to 280 DEG C, and the pressure of the prepolymerization is 1.5 to 3.2 MPa; the solid-phase polymerization comprises the following steps: firstly raising the temperature to 100-220 DEG C, then raising the temperature at the temperature raising rate of 1-10 DEG C / min, keeping the temperature for 5-20 minutes when the temperature is raised by 1-10 DEG C until the final temperature is 230-300 DEG C, and continuously reacting for 1-12 hours. The high-temperature-resistant polyamide prepared by the preparation method disclosed by the invention is low in yellowing index, low in gel content and better in mechanical property, and is more beneficial to application in high-temperature-resistant materials.

The present application relates to the field of polyolefin catalysts, in particular to a Ziegler-Natta catalyst for olefin polymerization and in-situ grafting, and a preparation method and application thereof. The Ziegler-Natta catalyst comprises the following blending components and / or reaction products: a carrier, a titanium element source, a magnesium element source, an electron donor and a free radical initiator. The free radical initiator is introduced during the preparation process of the catalyst, the preparation process is relatively simple, the grafting of the polar monomer on the polyethylene is initiated, the grafting reaction is more uniform, the amount of the free radical initiator is less, the grafting efficiency is higher, and the gel content is lower; the particle size of the catalyst can be adjusted according to the use requirement, thereby the particle size of the polymer is controlled, and the grafting efficiency is improved; the grafted polyethylene can be directly obtained by using the catalyst through a one-step method, the grafted product does not need to be dried and separated, and the preparation process of the grafted polyethylene is simplified.

Provided is a method for manufacturing a separator for an electricity storage device, the method comprising a step for forming a molded body by extruding powdered polyethylene, granular polypropylene, and a plasticizer in the form of a sheet by means of an extruder, and a step for making the molded body porous by means of a wet process.