8results about How to "The polymerization process is stable" patented technology

The invention discloses a preparation method of high-oil-resistance nitrile rubber, which comprises the following components in parts by weight: 275 parts of soft water, 50-55 parts of butadiene and 45-50 parts of acrylonitrile, wherein the addition amount of butadiene and acrylonitrile is 100 parts; the emulsifier is a dodecylbenzene sulfonic acid and naphthalene sulfonic acid formaldehyde condensate sodium salt composite system, and the dosage of the emulsifier is 2.5-5 parts; the initiator adopts persulfate, and the use amount of the initiator is 0.1-0.5 part; 0.1 part of triethanolamine; the preparation method comprises the following steps: synthesizing butyronitrile rubber cement by adopting an intermittent feeding mode of replenishing a molecular weight regulator in batches and a thermal polymerization process, adding a terminating agent and an anti-aging agent, and degassing, condensing, washing and drying to obtain a high-strength butyronitrile rubber product. The nitrile rubber has the Mooney viscosity ML (1 + 4) 100 DEG C of 90-120, the tensile strength of more than or equal to 27.5 MPa and the elongation at break of more than or equal to 450%, and can meet the application requirements in the fields of automobiles, aerospace, sealing washers and the like.

The present application relates to a terpene resin with controllable molecular weight and a preparation method thereof. A preparation method of a terpene resin with controllable molecular weight comprises: mixing β-pinene with ethylene glycol to obtain a mixture; mixing toluene and a catalyst at ‑5 to 5°C until uniform; dropping the mixture and keeping it warm at 5‑10°C for 1‑3h; removing the catalyst; desolventizing toluene and discharging the material, wherein the mass ratio of toluene to β-pinene is (1‑1.15): 1, the amount of the catalyst is 3.5‑5% of the mass of β-pinene, and the amount of ethylene glycol is 0.04‑0.07% of the mass of β-pinene. The present application can achieve precise control of the molecular weight of the terpene resin, prepare a terpene resin product with stable performance, and meet the high standard requirements of sanitary tape for viscosity, anti-aging and aviation electronic tape to enable it to perform accurately and stably in avionic electronic instruments, and broaden its application range in high-end applications such as medical, food, and aviation.

This invention discloses a method for preparing high oil-resistant nitrile rubber. Based on 100 parts by weight of butadiene and acrylonitrile, the mixture includes 275 parts soft water, 50-55 parts butadiene, and 45-50 parts acrylonitrile. The emulsifier is a composite system of dodecylbenzene sulfonic acid and naphthalene sulfonic acid formaldehyde condensate sodium salt, with an emulsifier dosage of 2.5-5 parts. The initiator is a persulfate, with a dosage of 0.1-0.5 parts. Triethanolamine is 0.1 parts. A nitrile rubber paste is synthesized via a thermal polymerization process using a batch feeding method with the addition of a molecular weight regulator. A terminator and antioxidant are added, and the paste is then degassed, coagulated, washed, and dried to obtain a high-strength nitrile rubber product. This nitrile rubber exhibits a Mooney viscosity (ML). (1+4) 100℃ With a strength of 90-120, tensile strength ≥27.5MPa, and elongation at break ≥450%, it can meet the application requirements of automobiles, aerospace, gaskets and other fields.

The invention relates to a preparation method of high-oil-resistance nitrile rubber, which at least comprises the following steps of: adding butadiene, acrylonitrile, water, a composite emulsification system, a part of molecular weight regulator and an initiator into a polymerization kettle, and synthesizing nitrile rubber cement by adopting an intermittent feeding mode of replenishing the molecular weight regulator in batches and a thermal polymerization process, and adding a terminating agent and an anti-aging agent, degassing, condensing, washing and drying to obtain the high-strength nitrile rubber product. The nitrile rubber has Mooney viscosity # imgabs0 # tensile strength of more than or equal to 27.5 MPa and elongation at break of more than or equal to 450%, and can meet the application requirements in the fields of automobiles, aerospace, sealing washers and the like.

The invention belongs to the field of monomer refining technology in the process of preparing chloroprene rubber, and specifically relates to a method for improving the quality of chloroprene monomer, which can reduce the impurity content in chloroprene monomer. The method has a simple process flow, and the chloroprene monomer impurities are treated by increasing the molecular sieve adsorption and screening process, and the monomer impurity content is reduced, thereby improving the quality of rubber products. The treatment method of the present invention is easy to implement, economical and environmentally friendly, the molecular sieve can be reused after regeneration treatment, and the screening effect is equivalent to the first use effect. The present invention is particularly better for the treatment of methyl vinyl ketone and 4-chloro-2-butanone, dimer, and inhibitor. By comparing the emulsion polymerization experimental results and the chloroprene rubber test results, it can be seen that the monomer quality has a more obvious effect on the emulsion polymerization and rubber quality, and the rubber comprehensive performance obtained by the emulsion polymerization of the chloroprene monomer after treatment is better, and the emulsion polymerization process is stable without gel phenomenon.

The present invention relates to a double metal cyanide catalyst, a method for preparing same and a method for preparing polyalkylene carbonate using the catalyst, and provides a double metal cyanide catalyst comprising a double metal cyanide compound and a complexing agent, wherein the complexing agent is represented by Formula 1, a method for preparing same and a method for preparing polyalkylene carbonate using the catalyst.

The invention provides low-entanglement copolymerized modified ultra-high molecular weight polyethylene, the viscosity average molecular weight of the low-entanglement copolymerized modified ultra-high molecular weight polyethylene is 1,000,000-1,200,000, the molecular weight distribution is 2-3, the tensile strength is 55-60 MPa, and the ratio of the initial elastic modulus to the equilibrium elastic modulus is 0.1-0.2. The preparation method comprises the following steps: diluting a metallocene catalyst and a cocatalyst with a solvent to obtain a catalyst diluent; the solvent is inert alkane of which the boiling point is not lower than 145 DEG C; adding a solvent as a kettle bottom solution into a stirring reaction kettle, adding the catalyst diluent, ethylene, 1-octylene and hydrogen into the kettle according to a stoichiometric ratio, and carrying out polymerization reaction at the temperature of 60-90 DEG C and the pressure in the kettle of 0.2-0.8 MPa; and after polymerization is completed, slurry discharged from the slurry is subjected to post-treatment. The high-performance low-entanglement copolymerized modified ultra-high molecular weight polyethylene is obtained by copolymerizing ethylene and 1-octylene and adopting long-chain alkane as a solvent, so that the machining performance of the product is greatly improved, and the problems of difficult polymerization, poor product performance, low octylene polymerization degree and the like existing in ethylene and octylene copolymerization are solved.

The present invention discloses a conditioning acrylic acid suspension thickener, a preparation method, a composition containing the same, a preparation method and an application thereof, wherein the composition comprises: (a) 0.01 to 15% of a conditioning acrylic acid suspension thickener; (b) 10 to 30% of a detersive surfactant; (c) 0.01 to 5% of a conditioning agent; and (d) the balance is an aqueous carrier, all based on the total weight of the composition. The composition of the present invention has the characteristics of good conditioning, good ion resistance, stable performance, etc., and is suitable for use as a shampoo.