Study On Influencing Factors And Product Properties Of Polymerization Of Nickel Butadiene Rubber

Butadiene rubber has a well-structured structure,no side chain groups,high elasticity,good low temperature performance,excellent wear and flex resistance,and good compatibility with other elastomers.It is widely used in tire manufacturing.China's production of general-purpose butadiene rubber devices mostly use nickel-based catalysts,product quality stability,product performance and foreign similar products have a gap.Nickel-based butadiene rubber uses nickel naphthenate as main catalyst,triisobutylaluminum as reducing agent and boron trifluoride diethyl ether complex as cocatalyst,and adopts "Ni-Al aging,thin B single addition" Technology.The interaction of the three catalysts can form an active center for initiating the polymerization of butadiene.Adjusting the amount of catalyst and the ratio between components can adjust the polymerization rate and adjust the product performance.In the polymerization process of butadiene,water can not only act as a catalyst to enhance the activity of the catalyst,but also kill the active species as an impurity and terminate the polymerization reaction.The impurities in the polymerization system are mainly derived from the accumulation of impurities in raw materials,various auxiliaries,recovery solvents and butadiene.Some impurities can cause the polymerization induction period to be prolonged,the polymerization activity to decrease,and even the polymerization reaction to be interrupted;some impurities can cause aggregation.The structure of butadiene molecules changes,affecting product quality.Changes in process conditions such as butadiene feed,polymerization temperature and pressure,and butane oil concentration will affect the polymerization reaction and affect product performance to some extent.Gel content is an important indicator of the quality of butadiene rubber products,which will directly affect the polymerization,the intrinsic quality and processing properties of the product.In order to improve product quality and stability,this paper studies the effects of catalyst dosage,catalyst ratio,trace water addition,raw material impurities,reaction control,gel on polymerization and product properties.The research results are as follows:(1)Increasing the amount of nickel naphthenate and boron trifluoride diethyl ether complex can reduce the Mooney viscosity of the product,increasing the triisobutylaluminum ratio can increase the Mooney viscosity of the product,and lowering the Al/B ratio can lower the Mooney viscosity of the product..(2)The water content of the polymerization system is low,and the activity at the initial stage of the polymerization is slightly poor.As the water content of butadiene increases,the activity in the middle and late stages increases,and the Mooney viscosity of the polymer increases.(3)When the content of impurities in the polymerization system is high,the polymerization reaction is weakened,the amount of the catalyst is increased,the polymerization conversion rate is lowered,the Mooney is high or low,the reaction is uncontrollable,and the physical properties of the product are unstable.(4)When the polymerization load of the polymerized butadiene is adjusted,the load is increased,the Mooney viscosity is increased,and the Mooney viscosity is lowered when the load is lowered.The temperature and pressure of the polymerization reaction and the concentration of the feed butane oil will directly affect the strength of the polymerization reaction,thereby affecting the chain transfer and chain growth,and affecting the Mooney viscosity of the glue.(5)The gel directly affects the polymerization reaction,the intrinsic quality and processing property of the product,and is an important factor affecting the polymerization cycle of the butadiene rubber.