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Preparation of high melt strength polypropylene

A high-melt-strength polypropylene technology, applied in the field of high-melt-strength polypropylene preparation, can solve the problems of high cost of catalysts and co-catalysts, limited practical value, and low melting point of polymers, and achieve good processability and melting The effect of high body strength and simple process

Active Publication Date: 2009-06-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of metallocene catalysts to prepare high melt strength polypropylene has limited practical value due to the high cost of catalysts and cocatalysts and the low melting point of polymers

Method used

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  • Preparation of high melt strength polypropylene
  • Preparation of high melt strength polypropylene
  • Preparation of high melt strength polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the reactor fully replaced by the inert gas, 12g of magnesium chloride, 25mL of ethanol, 200mL of white petrolatum oil, and 5mL of silicone oil were successively added, heated and stirred, reacted at 100-135°C for 2-4 hours, cooled to 20-80°C and added to give The electron compound is added dropwise within 2 to 3 hours, stirred for 1 to 2 hours at a temperature of -25 to -20°C, then heated to 110 to 130°C, and an electron donor is added, and the solid filtered after 2 to 4 hours of reaction is used Titanium tetrachloride is treated at 100-135 DEG C for 2-4 hours, filtered and washed with anhydrous hexane, and dried under vacuum to obtain a solid titanium catalyst.

[0027] 2. Preparation of high melt strength polypropylene

Embodiment 2

[0029] In a vacuum state, propylene was charged into a 500mL reaction kettle, followed by adding 100ml heptane, 3.6×10 -3 mol triethylaluminum in heptane, add 3.6 x 10 -2 mol of dimethoxydiphenylsilane (DDS) and 1.0×10 -2 mol of 1,7-octadiene, stir, add 0.05g TiCl 4 / DIBP / MgCl 2(Titanium tetrachloride / diisobutyl phthalate / magnesium chloride, the same below) Ziegler-Natta catalyst, react at 30° C. and 0.5MPa for 1 hour to obtain 20.2g of high melt strength polypropylene. DSC test showed that the melting point of the obtained product was 160°C, 1 H-NMR showed that the content of unsaturated ethylene double bonds in the copolymer was 0.15mol%. GPC test results: the weight average molecular weight was 9.9×10 4 , the molecular weight distribution is 4.80. And the polymer is in granular form with good shape.

Embodiment 3—11

[0031] Examples 3-11, otherwise the same as in Example 2, the operating conditions and the properties of the resulting high melt strength polypropylene are listed in Table 1.

[0032] Table 1 Examples 3-11

[0033] implement

example

solvent

1,7-Syn

diene

mmol pressure

(MPa)

reaction temperature

Degree (℃)

Yield

(g)

melting point

(°C)

terminal double bond

(mol%)

Wait

regulations

Spend

% weighted average

Molecular weight (×

10 -4 ) Melt Index

(g / 10min)

3 Hexane 10.0 0.5 30 17.6 160 0.13 97.0 47.0 0.30 4 Toluene 10.0 0.5 30 23.8 160 0.14 96.3 47.2 0.25 5 Heptane 10.0 0.5 70 34.1 155 0.10 96.5 43.7 0.09 6 Heptane 10.0 0.5 50 28.9 156 0.12 96.1 46.8 0.14 7 Heptane 70.0 0.5 70 23.7 150 0.49 93.2 50.0 0.41 8 Heptane 3.0 0.5 70 46.0 161 --- 98.2 40.9 0.86 9 Heptane 7.0 0.5 70 3...

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Abstract

The invention relates to a preparation method for high bath strength polypropylene with long chain branching. The preparation method comprises the following steps: in a vacuum status, charging a propylene monomer into a reaction kettle, adding 10 to 100mL of solvent, 1 to 1,000mmol non-conjugation Alpha, Omega-diolefin monomer, an external electron donor, a promoter and a main catalyst; setting the mol ratio of the promoter to the main catalyst to 10 to 5,000, setting the mol ratio of the main catalyst to the external electron donor to 1 to 100, setting the reaction temperature between 0 and 100 DEG C, setting the reaction pressure between 0.1 and 10MPa, setting the reaction time between 0.1 and 100 hours, adding acidified alcohol to terminate the polyreaction, and obtaining the high bath strength polypropylene after washing and vacuum drying. The main catalyst is a Ziegler-Natta catalyst; and the promoter can be aluminum triethyl, trimethylaluminum or triisobutyl aluminum. The process is simple and has good processing performance. The high bath strength polypropylene with different performance can be prepared through adjusting the dosage of Alpha, Omega-diolefin.

Description

technical field [0001] The present invention relates to a preparation method of high melt strength polypropylene with long chain branching. Background technique [0002] Polypropylene is one of the five general-purpose plastics. It has the characteristics of high melting point, good heat resistance, low density, excellent mechanical properties and good chemical stability. It is widely used in packaging materials, mechanical parts, household appliances, medical equipment, synthetic fiber and other fields. However, due to the linear structure of the molecular chain of conventional polypropylene, its melt strength drops sharply when the temperature is higher than the crystalline melting point, which directly causes some defects in the melt processing of polypropylene, such as low melt strength, container during thermoforming Uneven wall thickness, edge curling during extrusion coating calendering, difficulty in blowing film and preparing foamed products greatly limit its appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06C08F4/645
Inventor 董金勇刘彬彬王红英徐文清曹晨刚谭振明郭存悦李敏
Owner PETROCHINA CO LTD
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