Preparation method and application of polyethylene film

A technology of polyethylene film and ethylene, which is applied in the field of preparation of polyethylene film, can solve the problems of large difference in transverse tensile strength and unfavorable core material, etc., to improve heat removal ability, light transmittance, and latent heat of vaporization high effect

Active Publication Date: 2016-07-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the longitudinal and transverse tensile strengths of the linear low density po

Method used

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  • Preparation method and application of polyethylene film
  • Preparation method and application of polyethylene film
  • Preparation method and application of polyethylene film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] This embodiment adopts the TiCl supported by magnesium chloride 3 Main catalyst (main catalyst feed rate 2.18kg / h), Ziegler-Natta catalyst with triethylaluminum as cocatalyst. Wherein, the molar ratio of the main catalyst and the co-catalyst is 3.11 in terms of Ti / Al. Reaction flow see figure 1 .

[0088] The mass flow rate of mixed liquid I is 1.8 t / h, accounting for 0.42% of the mass flow rate of stream II. In the mixed liquid I, the alkane isopentane content accounts for 50% by weight of the mixed liquid (the molar content is 49%), and the olefin content accounts for 50% by weight of the mixed liquid (the molar content is 51%). The content of 1-hexene accounts for 45.1% by weight of the mixed liquid (the molar content is 38.5%). Mixed liquid I also contained 200 ppm of triethylaluminum cocatalyst.

[0089] The superficial fluidization gas velocity in the reactor was 0.75 m / s. The pressure of the reactor was 2.1 MPa, and the temperature was 89°C.

[0090] After...

Embodiment 2

[0097] This embodiment adopts the TiCl supported by magnesium chloride 3 Main catalyst (loading capacity is 1.75kg / h), Ziegler-Natta catalyst with triethylaluminum as cocatalyst. Wherein, the molar ratio of the main catalyst and the co-catalyst is 3.11 in terms of Ti / Al. Reaction flow see figure 1 .

[0098] The mass flow rate of mixed liquid I is 1.3t / h, accounting for 0.30% of the mass flow rate of stream II. In the mixed liquid I, the alkane isopentane content accounts for 45% by weight of the mixed liquid (the molar content is 35%), and the olefin content accounts for 55% by weight of the mixed liquid (the molar content is 65%), wherein the ethylene content accounts for 45% by weight of the mixed liquid (the molar content is 65%). 8.8% by weight (mole content is 17.8%), 1-butene content accounts for 46.2% by weight of the mixed liquid) (molar content is 47.2%), also contains 180ppm triethylaluminum cocatalyst in the mixed liquid.

[0099] The superficial fluidization g...

Embodiment 3

[0107] This embodiment adopts the TiCl supported by magnesium chloride 3 It is a Ziegler-Natta catalyst (feed amount of the main catalyst is 2.03kg / h), and triethylaluminum is used as a cocatalyst. Wherein, the molar ratio of the main catalyst and the co-catalyst is 3.11 in terms of Ti / Al. Reaction flow see figure 1 .

[0108] The mass flow rate of mixed liquid I is 1.7t / h, accounting for 0.37% of the mass flow rate of stream II. In the mixed liquid I, the alkane n-hexane content accounts for 25% by weight of the mixed liquid (the molar content is 25%), and the olefin content accounts for 75% by weight of the mixed liquid (the molar content is 75%), wherein the ethylene content accounts for 7.8% by weight of the mixed liquid. % by weight (23.8% in molar content), the content of 1-octene accounts for 67.2% by weight (51.2% in molar content) of the mixed liquid, and the mixed liquid also contains 180ppm of triethylaluminum cocatalyst.

[0109] The superficial fluidization ga...

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Abstract

The invention discloses a preparation method of a polyethylene film.The preparation method comprises the following steps of 1, conveying a main catalyst in a catalyst system into a reactor with mixed liquor I as carrier material flow, wherein the mixed liquor I comprises alkene, olefin and promoter; feeding olefin to material flow II flowing out of the reactor for replenishment, so that material flow III is obtained, and dividing the material flow III into material flow IIIa and material flow IIIb, wherein the material flow IIIa and the material flow IIIb flow back to the side and the bottom of the reactor respectively; in the reactor, obtaining polyvinyl through polymerization, and discharging the material out of the reactor, wherein olefin comprises alpha-olefin and ethene, and the mole concentration ratio of alpha-olefin to ethene in the mixed liquor I is 1 or higher; 2, making polyvinyl obtained in step 1 be subjected to a blow molding process, so that the polyethylene film is obtained.By means of the method, longitudinal and transverse tensile strength of the film is improved, and uniform longitudinal and transverse tensile strength is achieved.

Description

technical field [0001] The present invention relates to a kind of preparation method of polyethylene film, specifically, the present invention relates to a kind of preparation method of polyethylene film and its application. Background technique [0002] At present, biaxially oriented polypropylene film (BOPP) is the main product in the high-end packaging field because of its light weight, transparency, non-toxicity, moisture resistance and high mechanical strength. The new polyethylene biaxially oriented film (BOPE) shows more excellent performance than BOPP, with lighter weight, better transparency, gloss and printing effect. BOPE mainly has a 3-5 layer membrane structure, the most common is 3 layers, which are the outer base layer, the core base layer and the functional layer. The main component of the core layer is polyethylene (PE), and the addition of PE accounts for about 99% of the weight of the core layer. The tensile strength of the traditional polyethylene film ...

Claims

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Application Information

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IPC IPC(8): C08L23/20C08F210/16C08F210/14C08F210/08C08F2/00B32B27/08B32B27/32B32B27/18
CPCB32B27/08B32B27/18B32B27/32B32B2250/03B32B2250/242B32B2307/412B32B2307/5825B32B2519/00C08F210/08C08F210/14C08F210/16C08F2800/10C08J5/18C08L23/20C08L2201/10C08L2203/16C08L2203/162C08F210/02C08F2/00
Inventor 王靖岱陈美吴文清阳永荣韩国栋陈毓明胡晓波黄正梁范小强蒋斌波廖祖维杨勇张威
Owner ZHEJIANG UNIV
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