Production technology of ethylene propylene rubber
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A production process and technology for ethylene-propylene rubber, applied in the rubber field, can solve the problems of poor catalytic effect, low productivity, low steam efficiency and solvent recycling rate, and achieve high recycling rate, high production flexibility and high production strength. Effect
Inactive Publication Date: 2014-01-29
ANHUI TONGFENG RUBBER & PLASTIC IND
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[0002] Ethylene-propylene rubber is a kind of organic compound product and an extremely important raw material in the rubber product industry. It has a variety of good physical and chemical properties. In 2003, the amount of synthetic rubber in China reached about 1.13 million tons, of which the amount of EPDM rubber was 20,400 tons, accounting for only 1.8% of the amount of synthetic rubber, so the demand for ethylene-propylene rubber is still considerable. Improving its production process and producing more and better products has become the responsibility of the company. The application number is CN200710193031.3 Disclosed is a preparation method of ethylene-propylene rubber. Using ethylene and propylene as raw materials, in the presence of a catalyst metallocene compound and a cocatalyst MAO, carry out a polymerization reaction at 60-70° C. for 1-5 hours, and distill off the solvent to obtain ethylene-propylene rubber. Propylene rubber, the polymerization reaction process of this method is simple, the production cost is low, compared with the prior art, the pollution caused by the vanadium-based catalyst is reduced, which is beneficial to environmental protection, and a new process route has been developed for the production of ethylene-propylene rubber. However, this method has poor catalytic effect, low productivity, low recovery steam efficiency and low solvent reuse rate.
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Embodiment 1
[0016] (1) Polymerization: pre-cool the reaction ethylene and propylene to -50°C in two stages, use hexane as the solvent, and then add VOCl 3 -1 / 2Al 2 EtCl 3 Catalyst, dicyclohexyl peroxydicarbonate monomer, aminophenyl diethylaluminum amino complex activator, and pass into hydrogen, then put into the liquid-liquid filled reactor system to carry out polymerization reaction, the reaction temperature is 45°C, reaction pressure 2.0MPa, polymerization time 2min;
[0017] (2) Catalyst removal: By adding alkaline vanadium-removing agent sodium hydroxide and washing with hot water, the vanadium catalyst remaining in the polymer glue enters the water phase, and after two washings, the reactant The vanadium catalyst remaining in the medium is completely removed;
[0018] (3) Recovery of monomers and solvents: the unreacted polymer glue in step (2) is decompressed and flashed twice to complete the recovery of monomers and solvents;
[0019] (4) Agglomeration: Add additives such as ...
Embodiment 2
[0021] Example 2: The rest is the same as Example 1, except that in the step (1), the reaction temperature is 48°C, the reaction pressure is 2.2MPa, and the polymerization time is 3min; in the step (4), the polymer The glue concentration is taken as 8.0%.
Embodiment 3
[0022] Example 3: The rest is the same as Example 1, except that in the step (1), the reaction temperature is 53°C, the reaction pressure is 2.5MPa, and the polymerization time is 4min; in the step (4), the polymerization The glue solution concentration is 8.5%.
[0023] After the above process steps, the ethylene-propylene rubber sample is taken out to be tested:
[0024]
[0025] It can be seen from the above data that the produced ethylene-propylene rubber has high Mooney viscosity, high molecular weight, wide distribution range, moderate ethylene content, high recovery rate of monomer and solvent, polymerization efficiency above 96%, and high production efficiency.
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Abstract
The invention discloses a production technology of ethylene propylene rubber and relates to the field of rubbers. The production technology of the ethylene propylene rubber comprises five technological processes, namely polymerization, removal of a catalyst, recycling of a monomer and a solvent, coagulation as well as dehydration and drying. According to the production technology of the ethylene propylene rubber, a catalyst (described in the specification) is adopted in the polymerization process, a reaction speed is greatly increased, a full liquid phase thermal insulation reaction is adopted in the polymerization process, namely reaction heat is used for warming a polymerization kettle in a thermal insulation manner, optimal design of the polymerization kettle can meet reactant mixing requirement, a liquid-liquid filling reaction system can accurately control parameters of the polymerization technological process and product quality, concentration of a polymer glue solution is high, quantity of a cycle solvent is low, efficiency of recycled steam and recycling rate of the solvent are high, the polymerization kettle is small in volume but high in production intensity, conversion per pass is high, raw materials and a cycle monomer do not need to be refined, content of residual catalyst in the product is low, qualified rate of a product is high, consumption of the raw materials and the catalyst is low, and content of a vanadium catalyst in sewage is low. The production technology of the ethylene propylene rubber is good, high in production elasticity and low in investment.
Description
technical field [0001] The invention relates to the field of rubber, in particular to an ethylene-propylene rubber production process. Background technique [0002] Ethylene-propylene rubber is a kind of organic compound product and an extremely important raw material in the rubber product industry. It has a variety of good physical and chemical properties. In 2003, the amount of synthetic rubber in China reached about 1.13 million tons, of which the amount of EPDM rubber was 20,400 tons, accounting for only 1.8% of the amount of synthetic rubber, so the demand for ethylene-propylene rubber is still considerable. Improving its production process and producing more and better products has become the responsibility of the company. The application number is CN200710193031.3 Disclosed is a preparation method of ethylene-propylene rubber. Using ethylene and propylene as raw materials, in the presence of a catalyst metallocene compound and a cocatalyst MAO, carry out a polymerizat...
Claims
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