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A kind of production method of low ash polypropylene resin

A technology of polypropylene resin and production method, which is applied in the production field of low-ash polypropylene resin, can solve the problems of high resin ash content, achieve the effects of reducing ash content, good removal effect, and improving product isotacticity

Active Publication Date: 2021-06-18
TIANJIN UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ash content of the resin obtained by this method is relatively high

Method used

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  • A kind of production method of low ash polypropylene resin
  • A kind of production method of low ash polypropylene resin
  • A kind of production method of low ash polypropylene resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1 A production method of low-ash polypropylene resin, comprising the steps of:

[0055] The ash content of the raw material polypropylene resin to be treated is 111.8ppm, and the isotacticity is 95.3%;

[0056] a) One-time washing: add 1 kg of the above-mentioned raw material polypropylene, mixed lotion 1 composed of 10 kg of n-hexane and 5 kg of acetylacetone into the washing kettle, heat up to 60 ° C, wash for 1.5 h, centrifuge, and discharge to obtain a solid resin material one;

[0057] b) secondary washing: put the solid resin material obtained in step a) into a washing tank, add mixed lotion 2 consisting of 8 kg of n-hexane, 7 kg of acetylacetone, and 8 kg of ethanol, heat up to 70 ° C, wash for 1 h, and centrifuge. Discharge, get solid resin material two;

[0058] c) Washing three times: put the solid resin material 2 obtained in step b) into a washing kettle, add mixed detergent 3 consisting of 6 kg of acetylacetone and 10 kg of ethanol, heat up to 80...

Embodiment 2

[0061] Example 2 A production method of low-ash polypropylene resin, comprising the steps of:

[0062] The ash content of the raw material polypropylene resin to be treated is 111.8ppm, and the isotacticity is 95.3%;

[0063] a) One-time washing: add 1 kg of the above-mentioned raw material polypropylene, 5 kg of isooctane, and 3 kg of acetylacetone into the washing kettle, heat up to 70 ° C, wash for 1 h, centrifuge, and discharge to obtain a solid resin material one;

[0064] b) Secondary washing: put the solid resin material obtained in step a) into a washing tank, add mixed lotion 2 consisting of 4 kg of isooctane, 5 kg of acetylacetone, and 3 kg of ethanol, heat up to 80 ° C, wash for 1 h, and centrifuge , discharging, get solid resin material two;

[0065] c) Washing three times: put the solid resin material 2 obtained in step b) into a washing kettle, add mixed detergent 3 consisting of 4 kg of acetylacetone and 5 kg of ethanol, heat up to 80 ° C, wash for 1 h, cent...

Embodiment 3

[0068] Example 3 A production method of low-ash polypropylene resin, comprising the steps of:

[0069] The ash content of the raw material polypropylene resin to be treated is 111.8ppm, and the isotacticity is 95.3%;

[0070] a) One-time washing: add 1 kg of raw material polypropylene, 1 kg of pentane, 10 g of n-heptane, and 15 kg of acetylacetone into the washing kettle, heat up to 90 ° C, wash for 3 h, centrifuge, and discharge to obtain Solid resin material one;

[0071] b) Secondary washing: put the solid resin material obtained in step a) into a washing tank, add mixed lotion two consisting of 16 kg of pentane, 10 kg of acetylacetone, and 18 kg of isopropanol, heat up to 100 ° C, wash for 2 hours, and centrifuge Separation, discharging, get solid resin material two;

[0072] c) Washing three times: put the solid resin material 2 obtained in step b) into a washing kettle, add mixed lotion 3 consisting of 8 kg of acetylacetone and 15 kg of isopropanol, heat up to 110° C...

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Abstract

The invention provides a production method of low-ash polypropylene resin, which belongs to the field of resin production methods. The production method comprises the following steps: a) one-time washing: put the polypropylene resin to be treated into a washing kettle, add a mixed lotion 1 composed of a hydrocarbon solvent and a complexing agent, heat up, stir in a closed manner, and discharge the material by centrifugation. Obtain solid resin material 1; b) secondary washing: add mixed lotion 2 composed of hydrocarbon solvent, complexing agent and alcohol solvent, and centrifugally discharge to obtain solid resin material 2; c) triple washing: add complexing agent 2 Mixed lotion 3 composed of mixture and alcohol solvent, after heating up, airtightly stirred, centrifuged and discharged to obtain solid resin material 3; d) Four washings: adding alcohol solvent, centrifuged to obtain solid resin material 4. The method does not need to separately design and develop a catalyst, does not need to change the polymerization production process, is simple and easy, reduces production costs, and is suitable for deep deashing of polypropylene resin base materials produced by various processes.

Description

technical field [0001] The invention relates to the field of resin production methods, in particular to a production method of low-ash polypropylene resin. Background technique [0002] Polypropylene is a thermoplastic resin obtained by polymerizing propylene. Because of its low dissipation factor and high volume resistivity, it can be used in the electrical field, such as capacitor films. The ash content in polypropylene resin is an important measurement index, and its ash mainly comes from the main catalyst titanium tetrachloride (TiCl 4 ), the carrier magnesium dichloride (MgCl 2 ), cocatalyst triethylaluminum (Al(Et) 3 ) and silane-type external electron donors, the titanium, magnesium, aluminum, and silicon produced by them are the main components of ash. Generally speaking, the ash content of the polypropylene resin used in the electrical field is required to be lower than 50ppm. [0003] Generally, there are two main methods for preparing low ash polypropylene res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F6/00
Inventor 姜涛邢照亮张翀李健陈新齐迎昊肖雨李飞邵怀启闫冰陈延辉王佳伟张嘉王亚臣
Owner TIANJIN UNIV OF SCI & TECH