Preparation method of homopolymerization polypropylene bidirection drawing film special material

A homopolypropylene, biaxially oriented technology, applied in the field of preparation of homopolypropylene biaxially oriented film special materials, can solve the problems of high film breaking rate, poor product quality, unapproved, etc., and achieve film breaking rate Low, excellent product quality, stable production line effect

Inactive Publication Date: 2006-01-11
白跃华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ash content of polypropylene produced with this formula is as high as 300-400ppm, which is far higher than the 200ppm required by downstream processing manufacturers. The film rupture rate is high, and the product quality is poor, so it is not recognized

Method used

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  • Preparation method of homopolymerization polypropylene bidirection drawing film special material

Examples

Experimental program
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example 1

[0029] According to attached figure 1 In the process, the main catalyst, co-catalyst and electron donor (30% concentration) are sent into the tank 1 for full pre-contact. Propylene (reactor 1 propylene charge is set as 1000Kg / h) and catalyzer enters reactor 2 and 3 through reactor 1 (reactor 2 propylene charge is set as 7500Kg / h, reactor 3 propylene charge is set as 6000Kg / h), carry out the polymerization reaction.

[0030] The main catalyst adopts CS-2-B type high-efficiency catalyst, the addition amount is controlled between 0.2-0.23Kg / h, the device load is maintained at 7.5 tons / hour, the triethylaluminum / propylene is 180ppm; the electron donor / propylene is 5ppm , to ensure that the isotacticity of the product is between 94-96%. The amount of hydrogen added to reactor 2 is set to 350ppm, and the amount of hydrogen added to reactor 3 is set to 1350ppm, and the amount of hydrogen added to the reactor is fine-tuned according to the melt index of powder and pellets. The melt...

example 2

[0034] This example is an application example.

[0035] Use the homopolypropylene material produced by the present invention to sample in units such as Dezhou Qunli Plastic Co., Ltd., Qingdao Qingxin Plastic Co., Ltd., etc. Through the test, the manufacturers agree that the production line of our polypropylene raw material is stable during the film drawing process, the film breaking rate is low, the film thickness is evenly distributed, and the physical properties and appearance of the finished product are in line with the indicators specified in the national standard (see Table 6 and Table 1 for test data. 7-9), conducive to high output.

[0036] temperature, ℃

[0037] Element

[0038] Test based on

[0039]

[0040] Indicator name

[0041] Indicator name

[0042]

[0043] User units

[0044] User units

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Abstract

A process for preparing the homopolypropene used for bidirectional stretch film includes such steps as mixing propene, main catalyst, cocatalyst and electronic doner, prepolymerizing, polymerizing in serially connected two reactors, flash vaporizing deactivating, drying and granulating. It features that said main catalyst contains Ti and Mg and the antioxidizing agent, lubricant and stabilizer are used in said granulating step.

Description

technical field [0001] The invention relates to polymer polymerization technology, in particular to a method for preparing a special material for homopolymerized polypropylene biaxially stretched film. Background technique [0002] As we all know, polypropylene has excellent physical and mechanical properties and good thermal processing properties, so it has a wide range of uses. [0003] Polypropylene technology has developed rapidly, and there have been dozens of technical routes, which can be divided into four categories according to the type of polymerization, namely solvent method, solution method, bulk method and gas phase method. The bulk method uses propylene as the raw material, hydrogen as the molecular weight regulator, and polymerizes under the conditions of 55--75°C and 2.0-3.5Mpa. Compared with the solvent method, due to the low operation and investment costs, the production technology continues to develop, especially the use of high-efficiency catalysts Final...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06B29C55/00
Inventor 白跃华范爱民金翔郑建华
Owner 白跃华
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