Preparation method of ethylene/propylene copolymer with branched structure and the copolymer
A technology of propylene copolymer and branched structure, which is applied in the field of polymer copolymer preparation, can solve the problems of product crosslinking, difficulty in controlling the amount of diene, complicated operation, etc., and achieve the effect of good processing performance
Active Publication Date: 2020-05-12
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0004] However, free radical treatment can lead to degradation or crosslinking of polypropylene chains, and the peroxide used to generate free radicals can also give the product an odor
The main problem of the copolymerization method of propylene and diene is that it is difficult to control the amount of diene. A slight excess of diene will lead to crosslinking of the product, which is very difficult to operate in actual production. At the same time, the residue of diene will also cause the odor problem of the product.
[0007] Some studies also use a composite catalyst system. First, a catalyst is used to prepare a macromonomer, and then another catalyst is used to catalyze the copolymerization of an olefin monomer and a macromonomer to prepare a long-chain branched polymer. The operation is more complicated, and because the molecular weight of the polymer produced by the two catalysts is usually not exactly the same, the molecular weight distribution of the copolymer is broadened
Method used
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Embodiment 1-5
[0039] Examples 1-5 are used to illustrate the preparation of the propylene copolymer provided by the present invention.
[0040] The polymerization reactor was purged with nitrogen, and then the nitrogen was replaced with a mixed gas of propylene and ethylene (the molar ratio is shown in Table 1). Set the temperature of the reactor to the temperature required for polymerization (as shown in Table 1), add 45mL of toluene, a toluene solution of methylalumoxane (the concentration of methylalumoxane is 1.4mol / L), and stir 10 minutes. Then, a mixed gas of propylene and vinylene was introduced at a pressure of 0.1 MPa, and metallocene compounds were added into the reactor according to the amounts given in Table 1, respectively. Keep the pressure of propylene and ethylene at 0.1 MPa, and polymerize at the temperature shown in Table 1 for 30 minutes respectively. After the reaction, the reaction product was poured into 200mL ethanol (containing 10% by volume of concentrated hydroch...
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The invention relates to a preparing method of an ethylene / propylene copolymer having a branched structure. The method includes polymerizing ethylene and propylene. A poly(metallocene) catalyst includes a metallocene compound and a cocatalyst. The structure of the metallocene compound is Q2Si(2-R1-4-R2-Ind)(2-R<1><'>-4-R<2><'>-Ind)MX2, wherein the Q is C1-C6 alkyl, the R1 and the R<1><'> are respectively methyl, ethyl, propyl or isopropyl and are different, the R2 and the R<2><'> are respectively hydrogen, isopropyl, phenyl or naphthyl and are different or same, the M is zirconium or hafnium, the X is halogen or C1-C5 alkyl which is methyl preferably, and the Ind is indenyl. The invention also relates to the copolymer prepared by the method.
Description
technical field [0001] The invention relates to a preparation method of a copolymer, in particular to a preparation method of a polymer copolymer. The invention also relates to the copolymers obtained by this method. Background technique [0002] Polypropylene is a general-purpose plastic used in large quantities. Copolymerization of a small amount of ethylene monomer in polypropylene can significantly improve the transparency of the resin, and the low temperature performance is also improved. One of the main defects of polypropylene resin is low melt strength, which limits the application of polypropylene resin: In the field of blown film, in order to avoid bubble rupture, high molecular weight polypropylene resin is usually used, but the viscosity of resin melt with high molecular weight Also large, resulting in reduced production efficiency and increased energy consumption. [0003] In order to improve the melt strength, there are several methods in the literature: 1) ...
Claims
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IPC IPC(8): C08F210/06C08F210/02C08F4/6592
Inventor 范国强侯莉萍胡青
Owner CHINA PETROLEUM & CHEM CORP