5results about How to "Low gel content" patented technology

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.

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 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.