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Branched polypropylene and its preparation method

A branched polypropylene and polypropylene technology, applied in the field of branched polypropylene and its preparation, can solve the problems of limiting the application of polypropylene, decrease in melt strength, deterioration of sag resistance, etc. The effect of good processing rheology and high melt strength

Inactive Publication Date: 2007-05-16
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since polypropylene is a partially crystalline polymer, the softening point is very close to the melting point. After exceeding the melting point, the melt strength decreases rapidly, resulting in poor sag resistance, which greatly limits the use of polypropylene in foaming and thermoforming processes. Applications

Method used

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  • Branched polypropylene and its preparation method
  • Branched polypropylene and its preparation method
  • Branched polypropylene and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 50g of propylene copolymer of 4-methylstyrene and propylene (MFR=0.883, the molar content of 4-methylstyrene unit is 1.55*10 -2 %) into the internal mixer at a temperature of 210°C, stirring for 2 minutes, adding 0.77 g of trimethyl alcohol hydroxypropane triacrylate, stirring for 1 minute, and then simultaneously adding 0.0352 g of 2,5-dimethyl-2,5-di-tert- Butylperoxyhexane and 15mg tetraethylthiurab dithioester (TETDS) were reacted for 7 minutes and discharged to obtain branched polypropylene with a branching ratio of 0.3 / 1000°C and a melt strength of 223mN.

Embodiment 2

[0035] 50g of propylene copolymer of 4-methylstyrene and propylene (MFR=0.847, 4-methylstyrene unit molar content is 2.74*10 -2 %) into the internal mixer at a temperature of 210°C, stirring for 2 minutes, adding 0.88 g of trimethyl alcohol hydroxypropane triacrylate, stirring for 1 minute, and then simultaneously adding 0.0352 g of 2,5-dimethyl-2,5-di-tert-butyl Hexyl peroxide reacted with 15mg tetraethylthurium dithioester for 7min and then discharged to obtain branched polypropylene with a branching ratio of 0.43 / 10000C and a melt strength of 235mN.

Embodiment 3

[0037] 50g of propylene copolymer of 4-methylstyrene and propylene (MFR=0.297, the molar content of 4-methylstyrene unit is 3.71*10 -2 %) into the internal mixer at a temperature of 210°C, stirring for 2 minutes, adding 0.99 g of trimethyl alcohol hydroxypropane triacrylate, stirring for 1 minute, and then simultaneously adding 0.0352 g of 2,5-dimethyl-2,5-di-tert-butyl Hexyl peroxide and 15mg of tetraethylthiurabdithioester reacted after 7min to obtain branched polypropylene, and its branching rate was 0.45 / 10000C, and the melt strength of gained branched polypropylene was 237mN.

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Abstract

The invention discloses a branched polypropylene and preparing method, which comprises the following parts: 88.9-99.978% polypropylene, 0.01-10% polyfunctional monomer, 0.01-1% initiator and 0.002-0.1% branched accelerant, wherein the branched accelerant possesses the structure in the formula I; X is 1 or 2; R1, R2, R3 and R4 is alkyl or aryl with carbon atom number at 1-10; the third monomer and branched accelerant are induced into propylene homopolymer or copolymer through oxidizing, which possesses obvious hardening chain to inhibit beta-fracture to synthesize non-crosslinking branched polypropylene.

Description

technical field [0001] The invention relates to a branched polypropylene and a preparation method thereof. Background technique [0002] Polypropylene (PP) is one of the most promising thermoplastic polymer materials today. Compared with other general-purpose thermoplastic resins, it has small specific gravity, good mechanical properties such as yield strength and surface strength, and has outstanding stress crack resistance. It has been widely used because of its high resistance, wear resistance and chemical stability, as well as the wide source of raw materials and low price. However, since polypropylene is a partially crystalline polymer, the softening point is very close to the melting point. After exceeding the melting point, the melt strength decreases rapidly, resulting in poor sag resistance, which greatly limits the use of polypropylene in foaming and thermoforming processes. Applications. At present, there are mainly two ways to change the melt properties of poly...

Claims

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Application Information

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IPC IPC(8): C08F255/02B29C47/40
Inventor 董金勇王姝郭存悦
Owner INST OF CHEM CHINESE ACAD OF SCI
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