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Preparation method of polyvinyl chloride disentanglement mother material with high polymerization degree and ultrahigh polymerization degree

A high degree of polymerization, polyvinyl chloride technology, applied in the field of polyvinyl chloride processing technology, can solve the problems of poor processing fluidity, difficult processing and molding, etc., and achieve the effect of improving flow performance, maintaining mechanical and physical properties, and easy processing

Inactive Publication Date: 2004-02-25
NANJING UNIV
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  • Summary
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AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to: provide a kind of method for preparing unentangled high degree of polymerization and ultra-high degree of polymerization polyvinyl chloride, so that high degree of polymerization and ultra-high degree of polymerization polyvinyl chloride have good fluidity during processing, Solve the technical problems of poor processing fluidity and difficult processing of existing high-polymerization and ultra-high-polymerization polyvinyl chloride

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Example 1. Preparation of untangled high degree of polymerization and ultra-high degree of polymerization polyvinyl chloride:

[0027] Add 100 grams of high degree of polymerization polyvinyl chloride (with a degree of polymerization of 1800) to 1600-2400 grams of bis(2-ethylhexyl) phthalate (DOP) to form a 4-6% mixture. Dissolve at 120-140°C until the system is uniform and transparent, and continue to stir for half an hour. It is naturally cooled to room temperature, washed with 4-8 liters of ethanol (or methanol) for 2-3 times, then filtered and dried to obtain untangled high degree of polymerization polyvinyl chloride. Melt flow rate (MFR) measurement shows that when 80 parts of plasticizer (bis(2-ethylhexyl) phthalate) is added to every 100 parts of high degree of polymerization polyvinyl chloride, it is prepared by this method The melt flow rate of polyvinyl chloride with high degree of polymerization is 31 times higher than that of untreated high degree of polymerizat...

example 2

[0029] Example 2: Direct use of a masterbatch containing polyvinyl chloride and bis(2-ethylhexyl) phthalate (DOP) with unentangled high degree of polymerization and ultra-high degree of polymerization

[0030] The high degree of polymerization polyvinyl chloride (polymerization degree of 1800) is prepared into a 4-6wt% solution with bis(2-ethylhexyl) phthalate (DOP) as the solvent, and dissolved to the system at 120-140℃ It is uniform and transparent. Naturally cool to room temperature. Using bis(2-ethylhexyl) phthalate in the solution as a plasticizer (the amount can be calculated from the concentration) 80 parts, and 100 parts of high degree of polymerization polyvinyl chloride (highly polymerized by disentanglement in the solution) The melt flow rate (MFR) is measured with a formula composed of the amount of polyvinyl chloride and untreated high-polymerization polyvinyl chloride). The melt flow rate is higher than that of all untreated high-polymerization polyvinyl chloride. Th...

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Abstract

The preparation method of high polymerization degree and ultrahigh polymerization degree polyvinyl chloride disentanglement mother material includes the following steps: dissolving the high polymerization degree of ultrahigh polymerization degree polyvinyl chloride in the mesomolecular solvent di-2-ethylhexyl phthalate (DOP), heating, stirring, dissolving to transparent, naturally cooling to roomtemp., the solution can be directly used in various formulae or washing solution with ethyl alcohol (or methyl alcohol), filtering and drying so as to obtain the disentangled high polymerization degree or ultrahigh polymerization degree polyvinyl chloride mother material.

Description

1. Technical Field [0001] The invention relates to a method for preparing a polyvinyl chloride unentangled master batch with a high degree of polymerization and an ultra-high degree of polymerization, and belongs to the technical field of polyvinyl chloride processing technology. 2. Background technology [0002] Polyvinyl chloride is a general-purpose resin with excellent comprehensive properties and a wide range of uses. Among them, high degree of polymerization polyvinyl chloride refers to polyvinyl chloride with an average degree of polymerization of 1700 or more, and ultra-high degree of polymerization polyvinyl chloride refers to polyvinyl chloride with a degree of polymerization of more than 4,000. Compared with ordinary soft PVC, polyvinyl chloride with high degree of polymerization and ultra-high degree of polymerization has smaller permanent deformation, good dimensional stability at high temperature, good heat resistance, good hardness stability when changing temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/11C08L27/06
Inventor 薛奇周东山王晓亮孙清李亮
Owner NANJING UNIV
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