High-toughness polypropylene resin and production method thereof

Abstract

The invention discloses high-toughness polypropylene resin and a production method thereof. The high-toughness polypropylene resin is mainly prepared from high-toughness polypropylene base materials,antioxidants 1, antioxidants 2 and halogen absorbing agents, and the base materials are produced by a two-step compounding method in a Spheripol process. A production method of the base materials particularly includes the steps: taking propylene and hydrogen as raw materials in a first loop reactor, adding a catalyst, an electron donor and a promoter, controlling the concentration of the hydrogento be 4245-4300mg / kg, controlling loop density to be 460kg / m<3>, controlling ethylene content to be 0.5-6wt%, and producing polypropylene random copolymers; performing gas-phase copolymerization reaction on propylene homopolymers and ethylene monomers in the polypropylene random copolymers acquired in the first step in a second loop reactor, controlling the concentration of the hydrogen to be 4245-4260mg / kg, controlling loop density to be 460kg / m<3>, controlling loop density to be 470kg / m<3>, controlling ethylene content to be 4-10wt%, controlling gas phase ratio to be 0.2-0.5, preparing polypropylene powder, and namely, preparing the base materials. The bending modulus is 600MPa or more, the impact strength of a cantilever beam gap is 60J / m (23 DEG C) or more, haze is smaller than 10, andthe polypropylene resin is provided with good-transparency soft impact-resistant polypropylene.

Description

Technical field

[0001] The invention relates to a high-flexibility polypropylene resin, and also relates to a production method of the high-flexibility polypropylene resin. technical background

[0002] Highly flexible polypropylene resin is polypropylene with high flexibility and high impact resistance. At present, the widely used impact polypropylene is a kind of "reactor alloy", which is generally produced by a two-step composite method using the Spheripol process. This technology has been the most successful and widely used polypropylene process technology since its first industrialization in 1982. . The idea of ​​producing impact-resistant polypropylene by this process is as follows: firstly, propylene homopolymerization is performed to generate propylene homopolymer particles (homopolypropylene particles), and then ethylene-propylene gas phase copolymerization is performed to generate random copolymer polypropylene or block copolymer polypropylene. Their comparison with h...

Examples

Embodiment 1

[0039] The steps of the production method of the highly flexible polypropylene resin of Example 1 are as follows:

[0040] Step 1) In the Spheripol process, a two-step composite method is used to produce a highly flexible polypropylene base material, specifically:

[0041] Step 1-1) In the first loop reactor, using propylene, ethylene and hydrogen as raw materials, add catalyst DQC-602, co-catalyst TEAL2 and electron donor DONOR-C2, and control the hydrogen concentration to 4300mg / kg , Ring tube density 455kg / m 3 , Ethylene content 0.5wt%, production of random copolymer polypropylene;

[0042] Step 1-2) Step 1-2: In the second loop reactor, the propylene homopolymer and ethylene monomer in the polypropylene product of the random copolymerization of the first step undergo a gas phase copolymerization reaction, and the hydrogen concentration is controlled to 4260 mg / kg. Tube density 465kg / m 3 , The ethylene content is 4wt%, and the air ratio is 0.2 to obtain polypropylene powder, whic...

Embodiment 2

[0045] The steps of the production method of the highly flexible polypropylene resin of the second embodiment are as follows:

[0046] Step 1) In the Spheripol process, a two-step composite method is used to produce a highly flexible polypropylene base material, specifically:

[0047] Step 1-1) In the first loop reactor, using propylene, ethylene and hydrogen as raw materials, add catalyst DQC-602, co-catalyst TEAL and electron donor DONOR-C, and control the hydrogen concentration to 4258mg / kg , Ring tube density 458kg / m 3 , Ethylene content of 1.0wt%, production of random copolymer polypropylene;

[0048] Step 1-2) In the second loop reactor, the propylene homopolymer and ethylene monomer in the polypropylene product of the random copolymerization of the first step are subjected to gas phase copolymerization, and the hydrogen concentration is controlled to 4258 mg / kg. Tube density 466kg / m 3 , The ethylene content is 5wt%, and the air ratio is 0.3 to obtain polypropylene powder, whi...

Embodiment 3

[0051] The steps of the production method of the highly flexible polypropylene resin of the third embodiment are as follows:

[0052] Step 1) In the Spheripol process, a two-step composite method is used to produce a highly flexible polypropylene base material, specifically:

[0053] Step 1-1) In the first loop reactor, propylene, ethylene, and hydrogen are used as raw materials, and the catalyst DQC-602, the co-catalyst TEAL and the electron donor DONOR-C are added to control the hydrogen concentration to 4255mg / kg , The density of the ring tube is 459kg / m 3 , Ethylene content 2.0wt%, production of random copolymer polypropylene;

[0054] Step 1-2) In the second step, in the second loop reactor, the propylene homopolymer and ethylene monomer in the polypropylene product of the random copolymerization in the first step are subjected to gas phase copolymerization, and the hydrogen concentration is controlled to 4255mg / kg. Tube density 468kg / m 3 , The ethylene content is 6wt%, and the...

Technical field

[0001] The invention relates to a high-flexibility polypropylene resin, and also relates to a production method of the high-flexibility polypropylene resin. technical background

[0002] Highly flexible polypropylene resin is polypropylene with high flexibility and high impact resistance. At present, the widely used impact polypropylene is a kind of "reactor alloy", which is generally produced by a two-step composite method using the Spheripol process. This technology has been the most successful and widely used polypropylene process technology since its first industrialization in 1982. . The idea of ​​producing impact-resistant polypropylene by this process is as follows: firstly, propylene homopolymerization is performed to generate propylene homopolymer particles (homopolypropylene particles), and then ethylene-propylene gas phase copolymerization is performed to generate random copolymer polypropylene or block copolymer polypropylene. Their comparison with h...

Examples

Embodiment 1

[0039] The steps of the production method of the highly flexible polypropylene resin of Example 1 are as follows:

[0040] Step 1) In the Spheripol process, a two-step composite method is used to produce a highly flexible polypropylene base material, specifically:

[0041] Step 1-1) In the first loop reactor, using propylene, ethylene and hydrogen as raw materials, add catalyst DQC-602, co-catalyst TEAL2 and electron donor DONOR-C2, and control the hydrogen concentration to 4300mg / kg , Ring tube density 455kg / m 3 , Ethylene content 0.5wt%, production of random copolymer polypropylene;

[0042] Step 1-2) Step 1-2: In the second loop reactor, the propylene homopolymer and ethylene monomer in the polypropylene product of the random copolymerization of the first step undergo a gas phase copolymerization reaction, and the hydrogen concentration is controlled to 4260 mg / kg. Tube density 465kg / m 3 , The ethylene content is 4wt%, and the air ratio is 0.2 to obtain polypropylene powder, whic...

Embodiment 2

[0045] The steps of the production method of the highly flexible polypropylene resin of the second embodiment are as follows:

[0046] Step 1) In the Spheripol process, a two-step composite method is used to produce a highly flexible polypropylene base material, specifically:

[0047] Step 1-1) In the first loop reactor, using propylene, ethylene and hydrogen as raw materials, add catalyst DQC-602, co-catalyst TEAL and electron donor DONOR-C, and control the hydrogen concentration to 4258mg / kg , Ring tube density 458kg / m 3 , Ethylene content of 1.0wt%, production of random copolymer polypropylene;

[0048] Step 1-2) In the second loop reactor, the propylene homopolymer and ethylene monomer in the polypropylene product of the random copolymerization of the first step are subjected to gas phase copolymerization, and the hydrogen concentration is controlled to 4258 mg / kg. Tube density 466kg / m 3 , The ethylene content is 5wt%, and the air ratio is 0.3 to obtain polypropylene powder, whi...

Embodiment 3

[0051] The steps of the production method of the highly flexible polypropylene resin of the third embodiment are as follows:

[0052] Step 1) In the Spheripol process, a two-step composite method is used to produce a highly flexible polypropylene base material, specifically:

[0053] Step 1-1) In the first loop reactor, propylene, ethylene, and hydrogen are used as raw materials, and the catalyst DQC-602, the co-catalyst TEAL and the electron donor DONOR-C are added to control the hydrogen concentration to 4255mg / kg , The density of the ring tube is 459kg / m 3 , Ethylene content 2.0wt%, production of random copolymer polypropylene;

[0054] Step 1-2) In the second step, in the second loop reactor, the propylene homopolymer and ethylene monomer in the polypropylene product of the random copolymerization in the first step are subjected to gas phase copolymerization, and the hydrogen concentration is controlled to 4255mg / kg. Tube density 468kg / m 3 , The ethylene content is 6wt%, and the...

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