3 results about "Mooney viscosity" patented technology

Disclosed herein is a release sheet including: a base material; and a release agent layer provided on the base material, wherein the release agent layer is formed by curing a material mainly constituted of a diene-based polymer and contains substantially no silicone compound, and wherein Mooney viscosity (ML₁₊₄ (100° C.)) of the diene-based polymer before curing which is measured according to JIS K6300 at a temperature of 100° C. is in the range of 40 to 70. It is preferred that the material before curing is mainly constituted of one or two or more diene-based polymers having a cis-1,4 bond content of 90 to 99%.

The invention belongs to the technical field of polymer synthesis, and particularly relates to a method for controlling the viscosity of a molybdenum-based catalytic butadiene polymerization system. The preparation method comprises the following steps: under the protection of nitrogen, adding a structure modifier into a mixture of butadiene and solvent oil, and carrying out a coordination polymerization reaction on the butadiene at 30-90 DEG C by adopting a molybdenum-based catalytic system to synthesize a polymer glue solution with Mooney viscosity and dynamic viscosity of 1-10*10<4> mPa.s, wherein the molybdenum-based catalytic system is composed of a main catalyst molybdenum compound, a cocatalyst aluminum alkyl compound and a ligand. According to the invention, the number-average molecular weight of the high polymer obtained by polymerization is 10<4>-10<5>, the viscosity of the glue solution is 1-10*10<4> mPa.S, the Mooney viscosity ML1+4<100> is 40 to 60, the content of the 1,2 structures is greater than or equal to 75%, the gel content is not higher than 1% of the butadiene polymerization product, the molecular weight distribution is wide, the viscosity is controllable, theconveying performance is good, and the product can be used for tire materials.

The invention discloses a rubber mixing formula using a vulcanizing agent as well as a production process thereof, and belongs to the field of rubber mixing. The rubber mixing formula is prepared by mixing the following raw materials in parts by weight: 100 parts of raw rubber, 5 parts of zinc oxide, 2 parts of stearic acid, 2 parts of RL-20, 4 parts of PEG-4000, 4 parts of carbon black, 20 partsof black factice, 110 parts of paraffin oil and 15 parts of a vulcanizing agent. The scorching time of the rubber can be significantly prolonged, the Mooney viscosity can be reduced, the tensile strength of the rubber is significantly optimized, the storage property of the rubber is further improved, and transportation and processing are facilitated; and various raw materials can be mixed completely and various properties of the rubber material can be further improved.