Preparation method of polyethylene casting film

A technology for casting film and polyethylene, applied in the field of preparing polyethylene casting film, can solve problems such as temperature resistance and strength to be improved, and achieve the effects of improving strength, increasing production line speed, and increasing crystallization speed

Active Publication Date: 2015-02-11
SHANGHAI ZIHUA FILM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foreign countries generally use HDPE tape casting, but the temperature resistance and strength still need to be improved.

Method used

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  • Preparation method of polyethylene casting film

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preparation example Construction

[0013] The preparation method of polyethylene casting film of the present invention, concrete steps are as follows:

[0014] (1) Mix the nucleating agent into the organic solvent, disperse the nucleating agent evenly in the organic solvent under high-speed stirring conditions, and then mix the polyethylene particles evenly.

[0015] The mass of the nucleating agent is controlled to be 0.05-10wt% of the mass of the polyethylene particles, more preferably 0.1-5%.

[0016] Preferably, the mass of the organic solvent is 90%-100% of the mass of the polyethylene particles, more preferably the weight ratio is 1:1.

[0017] In the present invention, the polyethylene described in step (1) is any one of high-density polyethylene (HDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), and low-density polyethylene (LDPE). species or their mixtures. The molecular weight of polyethylene particles is selected according to the desired film. For example, polyeth...

Embodiment 1

[0032] (1) Mix 500 grams of DBS into 12 liters of ethanol, use a high-speed stirrer to disperse evenly, and then mix 10 kg of high-density polyethylene evenly;

[0033] (2) Place the mixture obtained in step (1) in a vacuum oven and evaporate for 2 hours at a temperature of 50°C and a vacuum of 1000pa;

[0034] (3) Put the particles obtained in step (2) into a vacuum drum, and crystallize for 1 hour at a temperature of 85°C and a vacuum of 5000Pa to obtain high-density polyethylene particles with improved crystallinity;

[0035] (4) Put the polyethylene particles prepared in step (3) at an extrusion temperature of 180-270°C, a cooling temperature of 30°C, a main cooling roll, an auxiliary cooling roll, a line speed of 110m / min, and no stretching Down-extrusion casting was performed to obtain a 50 gsm film product.

Embodiment 2

[0037] (1) Mix 50 grams of DBS into 12 liters of ethanol, use a high-speed stirrer to disperse evenly, and then mix 10 kg of high-density polyethylene and low-density polyethylene into the mixture; the ratio of high density to low density is 3:1

[0038] (2) Place the mixture obtained in step (1) in a vacuum oven and evaporate for 2 hours at a temperature of 50°C and a vacuum of 1000pa;

[0039] (3) Put the particles obtained in step (2) into a vacuum drum, and crystallize for 1 hour at a temperature of 60°C and a vacuum of 5000 Pa to obtain high-density polyethylene and low-density polyethylene particles with increased crystallinity;

[0040] (4) Put the polyethylene particles prepared in step (3) at an extrusion temperature of 180-270°C and a cooling temperature of 35°C, with one main cooling roll and one auxiliary cooling roll, and the line speed can reach 110m / min. Extrusion tape casting under conditions to obtain a 50gsm film product.

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Abstract

The invention relates to a preparation method of a polyethylene casting film The method comprises the following steps of: (1) uniformly dispersing a nucleating agent into an organic solvent, then uniformly mixing polyethylene particles, and controlling the mass of the nucleating agent to be 0.05-10% of that of the polyethylene particles; (2) evaporating a mixture obtained in step (1) in vacuum or at ordinary pressure to remove the organic solvent; (3) after the organic solvent is completely evaporated, raising a temperature to a crystallization temperature of 60-100 DEG C, so that the polyethylene particles are crystallized, and the crystallinity is controlled to be 65-90%; and (4) extruding the crystallized polyethylene particles to form a casting film, and preparing the polyethylene casting film. With the adoption of the method, the heat distortion temperature of a polyethylene film is raised, the strength of the polyethylene film is improved, the crystallization rate of the extruded film is high, and the requirement of production speed can be satisfied by soft water at normal temperature without chilled water after the cooling temperature is raised.

Description

technical field [0001] The invention relates to a method for preparing polyethylene cast film. Background technique [0002] The protective film for foreign automobile decoration materials needs to use a high temperature resistant polyethylene material, which can be completely melted at a temperature of 120-130 degrees, and can be cooled to form a film at a low temperature. In foreign countries, HDPE is generally cast and processed, but the temperature resistance and strength still need to be improved. Crystalline polyethylene film achieves the purpose of improving temperature resistance and strength by increasing the crystallinity of polyethylene. Contents of the invention [0003] In order to improve the performance of polyethylene casting film and improve the production efficiency of extrusion molding, the invention provides a new preparation method of polyethylene casting film. [0004] The preparation method of the polyethylene casting film of the present invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L23/08C08K5/053C08K5/13C08K5/098C08K3/34C08K3/22C08K3/36C08K3/16
Inventor 郭长华张乃文
Owner SHANGHAI ZIHUA FILM TECH CO LTD
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