Polypropylene composition and flame-retardant antistatic pipe

Abstract

The application relates to a flame-retardant antistatic polypropylene composition, which includes a basic polypropylene resin, a fire retardant and a conductive filling material. The basic polypropylene resin comprises a propylene homopolymer component and a propylene / ethylene copolymer component, wherein the propylene homopolymer component include a first propylene homopolymer and a second propylene homopolymer. The basic homopolymeric polypropylene resin has the molecular weight distribution (M<w> / M<n>) of 4-10, and M<z+1> / M<w> more than 10 and less than 20; the content of a xylene soluble substance at the room temperature is more than 10% by weight and less than 30% by weight, and the ratio of Mw of a trichlorobenzene soluble substance to Mw of a trichlorobenzene insoluble substance at the room temperature is more than 0.4 and less than 1. The provided high-performance flame-retardant antistatic polypropylene composition is excellent in mechanical strength and processing performance, qualified in optical performance, and relatively excellent in antistatic property. The application further relates to a pipe made from the composition.

Description

technical field

[0001] The invention relates to the field of macromolecules, in particular to a flame-retardant, antistatic and high-melt-strength polypropylene composition, a flame-retardant, antistatic, high-low temperature, impact-resistant PP-H pipe and a preparation method thereof. Background technique

[0002] Polypropylene pipe materials are mainly divided into homopolypropylene (PP-H), block copolymerized polypropylene (PP-B) and random copolymerized polypropylene (PP-R). The differences in the structures of these three materials make them different application characteristics, and therefore have different uses. Among them, PP-H can be used in high-temperature industrial sewage pipes and other fields due to its excellent hydrostatic resistance, good chemical corrosion resistance and high heat distortion temperature.

[0003] However, plastic pipes are insulating materials and are prone to static electricity. The suspended dust in the industrial production environme...

Examples

preparation example 1

[0094] This preparation example is used to illustrate the basic polypropylene resin provided by the present invention and its preparation method.

[0095] The propylene polymerization reaction is carried out on a polypropylene unit, and the main equipment of the unit includes a prepolymerization reactor, a first loop reactor, a second loop reactor and a third gas phase reactor. The polymerization method and steps are as follows.

[0096] (1) Prepolymerization reaction

[0097] The main catalyst (DQC-401 catalyst, provided by Sinopec Catalyst Company Beijing Aoda Branch), the cocatalyst (triethylaluminum), the first external electron donor (dicyclopentyl-dimethoxysilane, DCPMS) after 6 ℃, 20min after pre-contact, continuously into the continuous stirred tank prepolymerization reactor for prepolymerization reactor. The flow rate of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow rate of dicyclopentyl-dimethoxysilane is 0.3g / hr, the flow rate...

preparation example 2

[0105] This preparation example is used to illustrate the basic polypropylene resin provided by the present invention and its preparation method.

[0106] The catalyst used in Preparation Example 2, pre-complexation, and polymerization process conditions are the same as those in Preparation Example 1. The difference with Preparation Example 1 is: the amount of hydrogen in the second reactor in the second stage becomes 13000ppm, and the hydrogen in the second step gas phase reactor 2 / (C 2 +C 3 ) was adjusted to 0.49 (mol / mol). The first external electron donor was changed to methyl-isopropyl-dimethoxysilane (MIPMS), and the amount added remained unchanged. The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.

[0107] It can be seen from the results shown in Table 1 and Table 2 that the polypropylene material prepared according to the method of the present invention has high melt strength and relatively high high and low t...

Embodiment 1

[0109] This example is used to illustrate the polypropylene composition and the flame-retardant and antistatic PP-H pipe provided by the present invention.

[0110] The polypropylene composition provided in this example contains Preparation Example 1, a halogen-free flame retardant, a conductive filler and a lubricant.

[0111] The halogen-free flame retardant is superfine aluminum hydroxide by precipitation method, produced by Jinan Taixing Company, with a particle size of 500-800nm.

[0112] The conductive filler is acetylene carbon black, purchased from Tianjin Lihuajin Chemical Co., Ltd.;

[0113] The lubricant is a PEG lubricant produced by Clariant, Switzerland, with a weight-average molecular weight of 10,000.

[0114] (1) Preparation of polypropylene composition:

[0115] The above-mentioned components were weighed and mixed according to the proportion, wherein the preparation example 1 was 100kg, the halogen-free flame retardant was 40kg, the conductive filler was 3...

technical field

[0001] The invention relates to the field of macromolecules, in particular to a flame-retardant, antistatic and high-melt-strength polypropylene composition, a flame-retardant, antistatic, high-low temperature, impact-resistant PP-H pipe and a preparation method thereof. Background technique

[0002] Polypropylene pipe materials are mainly divided into homopolypropylene (PP-H), block copolymerized polypropylene (PP-B) and random copolymerized polypropylene (PP-R). The differences in the structures of these three materials make them different application characteristics, and therefore have different uses. Among them, PP-H can be used in high-temperature industrial sewage pipes and other fields due to its excellent hydrostatic resistance, good chemical corrosion resistance and high heat distortion temperature.

[0003] However, plastic pipes are insulating materials and are prone to static electricity. The suspended dust in the industrial production environme...

Examples

preparation example 1

[0094] This preparation example is used to illustrate the basic polypropylene resin provided by the present invention and its preparation method.

[0095] The propylene polymerization reaction is carried out on a polypropylene unit, and the main equipment of the unit includes a prepolymerization reactor, a first loop reactor, a second loop reactor and a third gas phase reactor. The polymerization method and steps are as follows.

[0096] (1) Prepolymerization reaction

[0097] The main catalyst (DQC-401 catalyst, provided by Sinopec Catalyst Company Beijing Aoda Branch), the cocatalyst (triethylaluminum), the first external electron donor (dicyclopentyl-dimethoxysilane, DCPMS) after 6 ℃, 20min after pre-contact, continuously into the continuous stirred tank prepolymerization reactor for prepolymerization reactor. The flow rate of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow rate of dicyclopentyl-dimethoxysilane is 0.3g / hr, the flow rate...

preparation example 2

[0105] This preparation example is used to illustrate the basic polypropylene resin provided by the present invention and its preparation method.

[0106] The catalyst used in Preparation Example 2, pre-complexation, and polymerization process conditions are the same as those in Preparation Example 1. The difference with Preparation Example 1 is: the amount of hydrogen in the second reactor in the second stage becomes 13000ppm, and the hydrogen in the second step gas phase reactor 2 / (C 2 +C 3 ) was adjusted to 0.49 (mol / mol). The first external electron donor was changed to methyl-isopropyl-dimethoxysilane (MIPMS), and the amount added remained unchanged. The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.

[0107] It can be seen from the results shown in Table 1 and Table 2 that the polypropylene material prepared according to the method of the present invention has high melt strength and relatively high high and low t...

Embodiment 1

[0109] This example is used to illustrate the polypropylene composition and the flame-retardant and antistatic PP-H pipe provided by the present invention.

[0110] The polypropylene composition provided in this example contains Preparation Example 1, a halogen-free flame retardant, a conductive filler and a lubricant.

[0111] The halogen-free flame retardant is superfine aluminum hydroxide by precipitation method, produced by Jinan Taixing Company, with a particle size of 500-800nm.

[0112] The conductive filler is acetylene carbon black, purchased from Tianjin Lihuajin Chemical Co., Ltd.;

[0113] The lubricant is a PEG lubricant produced by Clariant, Switzerland, with a weight-average molecular weight of 10,000.

[0114] (1) Preparation of polypropylene composition:

[0115] The above-mentioned components were weighed and mixed according to the proportion, wherein the preparation example 1 was 100kg, the halogen-free flame retardant was 40kg, the conductive filler was 3...

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