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Ternary polypropylene random copolymer and preparation method thereof, polypropylene pipe containing ternary polypropylene random copolymer and preparation method of polypropylene pipe

A polypropylene pipe, random copolymerization technology, applied in the field of ternary random copolymerized polypropylene and its preparation, polypropylene pipe and its preparation, can solve problems such as cracks or damage, poor overall performance, poor quality, etc., to achieve Low glass transition temperature, good low temperature impact resistance, good rigidity and toughness balance

Pending Publication Date: 2021-02-19
刘城
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, a considerable part of domestic polypropylene products still rely on imports, and the domestic quality is not good enough. Compared with similar foreign products, the structure of PPR pipe polypropylene has poor comprehensive performance, especially low temperature impact resistance, making the production of polypropylene (PP) -R) The pipe will be cracked or damaged during construction in winter

Method used

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  • Ternary polypropylene random copolymer and preparation method thereof, polypropylene pipe containing ternary polypropylene random copolymer and preparation method of polypropylene pipe

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preparation example Construction

[0027] The second, the present invention provides a kind of preparation method of ternary random copolymerization polypropylene, comprises the steps:

[0028] Under the joint action of the main catalyst, co-catalyst and external electron donor, propylene undergoes prepolymerization reaction in the prepolymerization reactor to obtain propylene prepolymer;

[0029] The propylene prepolymer reacts with fresh propylene, ethylene and butene-1 in a gas phase reactor to obtain ternary random copolymerized polypropylene.

[0030] In the present invention, the main catalyst is a ZN catalyst, and each component includes 12% to 22% of magnesium, 3% to 10% of silica gel, 1.5% to 5% of titanium, 36% to 65% of halogen, and internal Electron donor 5%~15% and elemental boron 0.03%~0.08%; internal electron donor is dibutyl phthalate, external electron donor is isobutylisopropyldimethoxysilane and cyclohexylethyl dimethoxysilane Compound of methoxysilane (X-Donor).

[0031] In the present inv...

Embodiment 1

[0047] (1) Preparation of ternary random copolymerized polypropylene

[0048] ① Under the joint action of the main catalyst, co-catalyst and external electron donor, propylene is prepolymerized in the prepolymerization reactor to obtain the prepolymerization reaction product.

[0049] ②React the pre-polymerization reaction product with fresh propylene, ethylene and butene-1 in a gas phase reactor. The temperature of the reactor is 65°C, the reaction pressure is 1.9MPa, the hydrogen concentration is 260ppm, and the ethylene / propylene ratio is 400kg / t. The ratio of ene-1 / propylene is 200kg / t, and the melt flow rate of the reaction is 0.5g / min ternary random copolymerized polypropylene. The content of ethylene in ternary random copolymerized polypropylene is 3.4wt.%, and the proportion of butene-1 is 1.3wt.%.

[0050]The main catalyst is a ZN catalyst, and each component is calculated by weight percentage, including magnesium 15%, silica gel 5%, titanium 3%, chlorine 50%, intern...

Embodiment 2

[0059] The difference between this embodiment and embodiment 1 is that

[0060] (1) Preparation of ternary random copolymerized polypropylene

[0061] The temperature of the reactor is 65°C, the reaction pressure is 2.1MPa, the hydrogen concentration is 200ppm, the ethylene / propylene is 350kg / t, the butene-1 / propylene is 180kg / t, and the melt flow rate obtained by the reaction is 0.6g / min Yuan random copolymer polypropylene. The content of ethylene in ternary random copolymerized polypropylene is 2.6wt.%, and the proportion of butene-1 is 1.5wt.%.

[0062] (2) Preparation of ternary random copolymerized polypropylene pipe

[0063] The weight ratio of each component of propylene random copolymerized polypropylene fiber material is: 99.1 parts of random copolymerized polypropylene base material, 0.2 part of antioxidant 1010, 0.2 part of antioxidant 1330, 0.2 part of antioxidant 168, halogen absorption 0.06 parts of the agent.

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Abstract

The invention relates to the technical field of polymer synthesis, and discloses a ternary polypropylene random copolymer comprising 2.5 wt.%-4.5 wt.% of ethylene, 1.2 wt.%-3.2 wt.% of butylene-1, andthe balance being propylene. The preparation method provided by the invention comprises the steps: carrying out a prepolymerization reaction on propylene in a prepolymerization reactor under the combined action of a main catalyst, a cocatalyst and an external electron donor to obtain a propylene prepolymer; and reacting the propylene prepolymer with fresh propylene, ethylene and butylene-1 in a gas-phase reaction kettle to obtain the ternary polypropylene random copolymer. The ternary polypropylene random copolymer is suitable for production of the polypropylene extruded pipe, the produced pipe has good low-temperature impact resistance, low glass-transition temperature and good rigidity and toughness balance, and the extrusion processability of the polypropylene pipe can be improved.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis, and in particular relates to a ternary random copolymerized polypropylene and a preparation method thereof, a polypropylene pipe containing the same and a preparation method thereof. Background technique [0002] Polypropylene is a thermoplastic resin produced by the polymerization of propylene. According to the position of the methyl group, it is divided into three types: isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene. Among them, the methyl group arranged on the same side of the main chain of the molecule is called isotactic polypropylene; the methyl groups arranged randomly on both sides of the main chain of the molecule are called atactic polypropylene; the methyl groups are arranged alternately on both sides of the main chain of the molecule Known as syndiotactic polypropylene. Generally, in industrially produced polypropylene resins, the content of...

Claims

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Application Information

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IPC IPC(8): C08F210/06C08F210/16C08F210/08C08F4/649C08L23/14C08K5/134C08K5/13C08K5/526C08K5/098C08K5/00
CPCC08F210/06C08K5/1345C08K5/13C08K5/526C08K5/098C08K5/00C08L2203/18C08F210/16C08F210/08C08F2500/04C08F4/6494C08L23/14
Inventor 刘城
Owner 刘城