Flame-retardant antistatic random copolymerization polypropylene composition and pipe

Abstract

The invention relates to a flame-retardant antistatic random copolymerization polypropylene composition, which includes a basic random copolymerization polypropylene resin, a fire retardant and a conductive filling material. The basic random copolymerization polypropylene resin includes a random copolymerization polypropylene continuous phase and a propylene-ethylene copolymer rubber disperse phase, wherein the random copolymerization polypropylene continuous phase at least comprises first random copolymerization polypropylene and second random copolymerization polypropylene, which are independently selected from propylene / ethylene random copolymer, propylene / butylene random copolymer and propylene / ethylene / butylene ternary random copolymer. The content of a xylene soluble substance of basic random copolymerization polypropylene resin at the room temperature is more than 10 wt% and less than 35 wt%. The ratio of Mw of a trichloro-benzene soluble substance to Mw of a trichloro-benzene insoluble substance is more than 0.4 and less than 1. The invention further relates to a pipe made from the composition and a preparation method.

Description

technical field

[0001] The invention relates to the field of macromolecules, in particular to a flame-retardant, antistatic, high-melt-strength polypropylene composition, a flame-retardant, antistatic, high-low temperature, impact-resistant PP-R 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-R has good impact resistance and high temperature creep resistance, so it can be used for underground pipes in coal mines to replace existing metal pipes. Thereby, the material cost can be reduced, the construction strength can be reduced, the service life can be increased, and so on.

[0003] However, plastic pipes are insulating materials and ...

Examples

preparation example 1

[0106] This preparation example is used to illustrate the basic PP-R resin with high melt strength and impact resistance provided by the present invention and its preparation method.

[0107] 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.

[0108] (1) Prepolymerization reaction

[0109] The main catalyst (DQC-401 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company), co-catalyst (triethylaluminum), and the first external electron donor (diisopropyldimethoxysilane, DIPMS) were tested at 6 °C , After 20min pre-contact, continuously add to the continuous stirred tank type pre-polymerization reactor for pre-polymerization reactor. The flow of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow of diisopr...

preparation example 2

[0117] This preparation example is used to illustrate the basic PP-R resin with high melt strength and impact resistance provided by the present invention and its preparation method.

[0118] The catalyst used, pre-complexation, polymerization process conditions and auxiliary agent formulation and addition are the same as in Preparation Example 1. The difference from Preparation Example 1 is that the amount of comonomer ethylene added in the first stage and the second stage in the first step is changed to 30000ppm. The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.

[0119] As can be seen from the results shown in Table 1 and Table 2, the basic random copolymer polypropylene resin prepared according to the method of the present invention has very high melt strength, and simultaneously has a very high notch at room temperature or at low temperature Impact strength.

Embodiment 1

[0121] This example is used to illustrate the polypropylene composition and the flame-retardant and antistatic PP-R pipe provided by the present invention.

[0122] The polypropylene composition provided in this example contains Preparation Example 1, a halogen-free flame retardant, a conductive filler and a lubricant.

[0123] The halogen-free flame retardant is superfine aluminum hydroxide by precipitation method, produced by Jinan Taixing Company, with a particle size of 500-800nm.

[0124] The conductive filler is acetylene carbon black, purchased from Tianjin Lihuajin Chemical Co., Ltd.;

[0125] The lubricant is a PEG lubricant produced by Clariant, Switzerland, with a weight-average molecular weight of 10,000.

[0126] (1) Preparation of polypropylene composition:

[0127]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 3k...

technical field

[0001] The invention relates to the field of macromolecules, in particular to a flame-retardant, antistatic, high-melt-strength polypropylene composition, a flame-retardant, antistatic, high-low temperature, impact-resistant PP-R 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-R has good impact resistance and high temperature creep resistance, so it can be used for underground pipes in coal mines to replace existing metal pipes. Thereby, the material cost can be reduced, the construction strength can be reduced, the service life can be increased, and so on.

[0003] However, plastic pipes are insulating materials and ...

Examples

preparation example 1

[0106] This preparation example is used to illustrate the basic PP-R resin with high melt strength and impact resistance provided by the present invention and its preparation method.

[0107] 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.

[0108] (1) Prepolymerization reaction

[0109] The main catalyst (DQC-401 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company), co-catalyst (triethylaluminum), and the first external electron donor (diisopropyldimethoxysilane, DIPMS) were tested at 6 °C , After 20min pre-contact, continuously add to the continuous stirred tank type pre-polymerization reactor for pre-polymerization reactor. The flow of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow of diisopr...

preparation example 2

[0117] This preparation example is used to illustrate the basic PP-R resin with high melt strength and impact resistance provided by the present invention and its preparation method.

[0118] The catalyst used, pre-complexation, polymerization process conditions and auxiliary agent formulation and addition are the same as in Preparation Example 1. The difference from Preparation Example 1 is that the amount of comonomer ethylene added in the first stage and the second stage in the first step is changed to 30000ppm. The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.

[0119] As can be seen from the results shown in Table 1 and Table 2, the basic random copolymer polypropylene resin prepared according to the method of the present invention has very high melt strength, and simultaneously has a very high notch at room temperature or at low temperature Impact strength.

Embodiment 1

[0121] This example is used to illustrate the polypropylene composition and the flame-retardant and antistatic PP-R pipe provided by the present invention.

[0122] The polypropylene composition provided in this example contains Preparation Example 1, a halogen-free flame retardant, a conductive filler and a lubricant.

[0123] The halogen-free flame retardant is superfine aluminum hydroxide by precipitation method, produced by Jinan Taixing Company, with a particle size of 500-800nm.

[0124] The conductive filler is acetylene carbon black, purchased from Tianjin Lihuajin Chemical Co., Ltd.;

[0125] The lubricant is a PEG lubricant produced by Clariant, Switzerland, with a weight-average molecular weight of 10,000.

[0126] (1) Preparation of polypropylene composition:

[0127]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 3k...

Images