100results about How to "High Mooney viscosity" patented technology

A thermoplastic olefin (TPO) composition comprises (1) a major amount by weight of (a) a substantially linear homopolymer or copolymer of a C₂-C₁₀ α-olefin in major proportion to (b) a long chain branched a linear homopolymer or copolymer of a C₂-C₁₀ α-olefin, (2) a minor amount by weight of a cross linkable elastomer, and (3) at least one thermally decomposing free radical generating agent present in an amount sufficient to promote an increase in melt strength of the composition over that of the melt strength of the linear homopolymer or copolymer of a C₂-C₁₀ α-olefin alone and insufficient to substantially degrade the α-olefinic polymers. The TPO composition is prepared by melt blending the components at a temperature sufficient to melt said homopolymers or copolymers of a C₂-C₁₀ α-olefin and thermally decompose said agent. Articles are thermoformed from the thermoplastic olefin.

This invention relates to vegetable oil extended rubber containing soy oil and tire with a component of such oil extended rubber.

The method for producing a modified conjugated diene based (co)polymer, according to the present invention comprises

• • (a) obtaining a primarily modified polymer by carrying out a primary modification reaction wherein at least one member selected from the group consisting of an alkoxysilane compound and a silanol compound is introduced into the active alkali metal terminal of a conjugated diene based (co)polymer having an active alkali metal terminal, and
  • (b) obtaining a secondarily modified polymer (a modified conjugated diene based (co)polymer) by subjecting the above-obtained primarily modified polymer to reactions comprising (b1) and (b2).
  • (b1): a reaction with a condensation accelerator comprising a metal element.
  • (b2): a reaction with at least one member selected from the group consisting of inorganic acids and metal halides.

A method of grafting and modifying rubber latex containing poly conjugated dialkene by in situ hybridization of silicon includes the following steps taking 100 parts by mass of rubber latex containing poly conjugated dialkene, adding from 4 to 25 parts of organic siloxane monomers with unsaturated bond into the rubber latex containing poly conjugated dialkene, stirring sufficiently to obtain uniform mixture, adding from 0.20 to 0.36 parts of initiators with stirring at the temperature of 5-85 DEG C for carrying out graft polymerization reaction for 5 to 8 hours, and agglomerating and drying the grafted and modified rubber latex. The structure formula of organo-sillicone monomers with unsaturated bond is Y-Si(R1R2R3), wherein Y- is unsaturated aliphatic chain segment with 2 to 18 carbons, R1- is alkoxy with 1 to 12 carbons, aryloxya with 6 to 12 carbons or silicide with 3 to 12 carbons, and R2 and R3 are the same groups as R1 or can also be saturated chain segment with 1 to 20 carbons or annular alkane or aromatic hydrocarbon with 1 to 8 carbons.

The method for producing a modified conjugated diene based (co)polymer, according to the present invention comprises a step of reacting a conjugated diene based (co)polymer with a metal halide compound to obtain a modified conjugated diene based (co)polymer, the conjugated diene based (co)polymer having a weight-average molecular weight of 150,000 to 2,000,000 and being obtained by bonding, to a polymer having at least a conjugated diene unit, an alkoxysilyl group and an optionally protected primary amino group. The method can satisfactorily produce a conjugated diene based (co)polymer which has a high Mooney viscosity, excellent shape stability and good processability.

An tetrafluoroethylene-propylene fluorine-containing elastomer and its preparation method includes: (1) providing an aqueous dispersions of comonomer, which includes: (a) tetrafluoroethylene, propylene and one or more kind of other comonomers, (b) oxidation-reduction system, which includes: water-soluble inorganic peroxide initiator, water-soluble iron salt reductant, coordination agent, water-soluble inorganic aid reducer, (c) water-soluble metal hydroxide pH modifier, and (d) emulsifier. Its characteristic is (2) under the polymerization temperature of 10~50deg.C and polymerization pressure of 3.1~8MPa, the monomers take polymerization.

The invention relates to an emulsion polymerization method for preparing a tractable butadiene styrene rubber. The polymerization method comprises at least the following steps: adding part of styrene (an oil phase) and part of an emulsifier (an aqueous phase), a regulator and an initiator into a polymerization kettle; adding butadiene; carrying out emulsion polymerization with stirring; and when conversion rate of the polymerization reaction in the middle stage reaches 30-60%, refilling the emulsifier, the crosslinking agent, styrene and the regulator by one or more times. The styrene butadiene rubber prepared by the method provided by the invention has high micro gel content and low gel content; coupled with the electron cloud effect of the pi bonds in the benzene ring of the molecular chain, a three-dimensional net shape structure is easy to form in the processing process; and the rubber product has good physical and mechanical properties, increased Mooney viscosity, and correspondingly increased tensile strength and 300% stretching strength.

High viscosity elastomers are often difficult to utilize in rubber compositions without first creating a pre-blend of the high viscosity elastomer and a rubber processing oil to reduce their overall viscosity. This invention relates to utilization of a specialized pre-blend of high viscosity and low viscosity elastomers for use in rubber compositions and to the resulting rubber composition. The use of such resulting rubber composition may be for component(s) of tires, particularly including tire treads. The specialized pre-blend of high and low viscosity elastomers is required to be created by blending individual latices or, alternatively, by blending individual polymerizates of elastomers with diverse viscosities.

Relating to the rubber field, the invention discloses a production technology for chloroprene rubber. The technology comprises the processes of: rubber drying, plastication, mixing, semi-finished product cutting and vulcanization. According to the method, by strictly controlling the rubber drying temperature and time in the rubber drying process, the quality of the dried rubber material is improved. The mixing process adopts a two-stage mixing process, well controls the mixing time and discharge temperature, so that scorching phenomenon of chloroprene rubber is significantly reduced, and the rubber guiding, discharge and batch-out of an open mill are smooth, and no roll sticking phenomenon appears. The vulcanization process adopts N-tert-butyl-2-bisbenzothiazole sulfenamide as a vulcanization accelerator, which is safe and pollution-free and has no harm to the human body. The technological process adopts a drum type vulcanizing machine, the vulcanization efficiency and quality are greatly improved, and the produced product has high Mooney viscosity and good quality. The technological method has the advantages of good technology, simple operation, and good technological stability, thus being suitable for factory automation production.

The invention discloses a one-step continuously-mixed rubber compound for automobile sealing strips and a preparation method thereof. The rubber compound comprises the following raw materials in partsby weight: 100 parts of EPDM (Ethylene-Propylene-Diene Monomer) raw rubber, 60-200 parts of carbon black, 30-100 parts of filler, 60-120 parts of paraffin oil, 7-12 parts of active agent, 8-12 partsof calcium oxide, 1-2.5 parts of vulcanizing agent, 4.3-10.9 parts of accelerator, 0.6-1 part of anti-scorching agent and 0-4 parts of foaming agent. The rubber compound disclosed by the invention hasthe beneficial effects that the rubber compound is stable in Mooney viscosity and vulcanization performance and good in consistency and when the rubber compound is used for the production of the automobile sealing strips, the obtained product is smooth in surface, few in particles and high in dimensional stability; and the preparation method disclosed by the invention has the beneficial effects of low cost, high efficiency, energy conservation and consumption reduction and has a broad market development prospect in the field of high-end automobile sealing strip preparation.

The invention relates to a rubber composition used for an automobile cooling pipe. The rubber composition comprises the following components in parts by weight: 10 to 30 parts of chlorinated polyethylene rubber, 70 to 90 parts of ethylene acrylate rubber, 5 to 10 parts of a heat stabilizer, 2 parts of an anti-aging agent, 12 parts of a plasticizer, 5 to 10 parts of a heat resistant agent, 2 to 8 parts of a tear resistant agent, 100 to 120 parts of carbon black, 6 to 9 parts of a peroxide crosslinking agent, 2 parts of an auxiliary crosslinking agent and 1 part of an internal releasing agent. According to the invention, AEM rubber is used as a main material and combines with CM rubber, and through advantage complementation of different rubber performances and optimization of a filling system, a composition combining the ethylene acrylate rubber with the chlorinated polyethylene rubber is manufactured, so the Mooney viscosity of the AEM rubber is enhanced, and the extrusion process performance and the high-temperature tear resistance of AEM are improved; and the heat stabilizer, the heat resistant agent, the reactive extraction-resistant anti-aging agent MC and the tear resistant agent are added, so the composition is endowed with temperature resistance as same as the AEM rubber, while the extrusion process performance and the high-temperature tear resistance are improved, and the material cost is reduced.

The present invention relates to a method for preparing a high 1,4-cis polybutadiene having a controlled cold flow and, more particularly, to a novel method for preparing a high 1,4-cis polybutadiene having a controlled cold flow that involves initiating polymerization of a 1,3-butadiene in the presence of a non-polar solvent using, as a polymerization catalyst, a complex prepared by mixing a neodymium compound with or without a conjugated diene compound, a halogenated organoaluminum compound or a halogenated organic compound, and an organoaluminum compound irrespective of the addition order of the catalyst; and adding an organoborane compound as a cold flow controller of 1,4-cis polybutadiene after a predetermined time of the polymerization. Accordingly, a high 1,4-cis polybutadiene having an efficiently controlled cold flow can be prepared without causing a significant increase in the Mooney viscosity (molecular weight), an odor (bad smell), and a reduction in 1,4-cis content and polymerization yield.

The invention relates to a synthesis method of a bimodal-distribution ethylene-propylene-nonconjugated diene random copolymer, which comprises the following steps: introducing a gas mixture of ethylene, propylene and hydrogen into a reaction kettle, adding a primary catalyst, a cocatalyst and an activating agent, and adding the non-conjugated diene for polymerization at 25-45 DEG C under the pressure of 0.3-0.6 MPa. The propylene/ethylene mol ratio is 1-6; the hydrogen accounts for 0.05-0.5 mol% in the comonomer; the addition amount of the non-conjugated diene in every 1000mL of hexane is 2-10mL; the acidic-phosphate modified vanadium compound is used as the primary catalyst, the halogenated alkyl aluminum is used as the cocatalyst, and the mol ratio of Al in the cocatalyst to V in the primary catalyst is (1-100)/1; the activating agent is ethyl trichloroacetate, and the mol ratio of the activating agent and the vanadium compound is (1-10)/1; and the copolymer has high Mooney viscosity and moderate molecular weight distribution, and is used in processing rubber of automobile seals.