Polyethylene hydrophobic material and preparation method thereof

A hydrophobic material, polyethylene technology, applied in the field of polymer materials, can solve the problems of high cost, unfriendly environment, and inability to realize continuous large-scale industrialization, and achieve the effect of low cost, regularity and good dimensional stability

Active Publication Date: 2020-01-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these methods have a series of problems such as high cost, low yield, inability to realize continuous large-scale industrialization and unfriendly environment.

Method used

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  • Polyethylene hydrophobic material and preparation method thereof
  • Polyethylene hydrophobic material and preparation method thereof
  • Polyethylene hydrophobic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0044] (1) First, dry polypropylene (PP) particles at 60°C in an oven for 8 hours, then add them to the primary melt injection unit barrel of the multi-melt multiple injection molding equipment for melting and plasticization, as a primary injection melt to be used;

[0045] (2) Polyethylene (PE) pellets were dried in an oven at 60°C for 8 hours and then added to the barrel of the secondary melt auxiliary injection platform of the multi-melt multiple injection molding equipment for melting and plasticization, as a secondary The first injection of melt is ready for use;

[0046] (3) The PP primary melt in step (1) is short-shot into the cavity to half-fill the cavity, and then the PE secondary melt in step (2) is injected into the cavity so that the secondary PE melt The body pushes and penetrates the PP melt once and fills the entire cavity; among them, the process parameters of multi-melt multiple injection molding are set as: Body injection speed is 15-56.7ccm / s, primary PP...

Embodiment 1

[0050] Isotactic polypropylene (iPP, grade PPH-T03, produced by China Maoming Petrochemical Company) and metallocene-catalyzed linear low-density polyethylene (mLLDPE, grade 3578CB, produced by ExxonMobil Corporation, with a weight-average molecular weight of M w =1.3×10 5 g / mol, molecular weight distribution coefficient D=1.74) respectively added to the primary melt injection unit of the multi-melt multiple injection molding equipment and the barrel of the secondary melt injection platform for plasticization, and finally as the primary melt Perform multi-melt multiple injection molding steps with the secondary melt, and the molding process is:

[0051] (1) First, short-shot the iPP melt plasticized by the primary injection unit into the cavity along the injection flow direction (MD), the primary injection speed is 57.7ccm / s, the primary injection pressure is 2270bar, and the primary injection temperature is 200°C; Then inject the mLLDPE melt plasticized by the secondary auxi...

Embodiment 2

[0059] Isotactic polypropylene (iPP, brand name PPH-T03, produced by China Maoming Petrochemical Company) and metallocene-catalyzed polyethylene (mPE, brand name S1498A, produced by Exxon Mobil Corporation, weight average molecular weight M w =1.0×10 5 g / mol, molecular weight distribution coefficient D=1.82) were respectively added to the primary melt injection unit of the multi-melt multiple injection molding equipment and the barrel of the secondary melt injection station for plasticization, and finally used as the primary melt Perform multi-melt multiple injection molding steps with the secondary melt, and the molding process is:

[0060](1) First, shortly shoot the iPP melt plasticized by the injection unit along the MD, the injection speed is 57.7ccm / s, the injection pressure is 2270bar, and the injection temperature is 200°C; then go to the mold along the MD The mPE melt plasticized by the secondary auxiliary injection platform is injected into the cavity, the secondary...

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Abstract

The invention relates to the technical field of high polymer materials, in particular to a polyethylene hydrophobic material and a preparation method thereof. The invention aims to provide the preparation method of the polyethylene hydrophobic material. The preparation method comprises the steps of adopting a multi-melt multi-time injection molding method, adopting polypropylene as a primary injection melt and polyethylene as a secondary injection melt, firstly short-injecting the polypropylene primary melt into a mold cavity for semi-filling the mold cavity, injecting the polyethylene secondary melt into the mold cavity, and enabling the secondary polyethylene melt to push and penetrate through the primary polypropylene melt so as to fully fill the whole mold cavity; then through coolingand pressure maintaining as well as demoulding and ejecting, obtaining a sandwich-shaped multi-melt multi-time injection molding product adopting the polypropylene as a surface layer and the polyethylene as a sandwich layer; and finally stripping the polypropylene surface layer from the polyethylene sandwich layer so as to obtain the polyethylene hydrophobic material. The method provided by the invention is simple, convenient, easy, low in cost, and capable of being continuously carried out in a large scale so as to realize industrialization.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polyethylene hydrophobic material and a preparation method thereof. Background technique [0002] With the increasing demand for surface chemistry and blue energy in industrial production and daily life, super-hydrophobic materials, a kind of material used in self-cleaning, anti-freezing, anti-fog, anti-corrosion, oil-water Materials for separation, water cleaning and extraction, and fluid drag reduction and loss reduction have received extensive attention and research. The contact angle is greater than 150°, and the rolling contact angle is less than 5°. It is recognized that the two decisive factors that make the material surface have superhydrophobic properties are: (1) the surface has a micro-nano scale composite structure; (2) the surface has low surface energy substances. [0003] At present, the preparation of superhydrophobic surfaces with low surface energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/16B29K23/00
CPCB29C45/1642B29C45/1646B29C2045/1654B29C2045/167B29K2023/06B29K2023/0625B29K2023/12
Inventor 刘正英黄炎昊杨鸣波杨伟吴校天
Owner SICHUAN UNIV
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