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Extrusion molding method for high strength double peak polyethylene/chitin nano crystal composite material

A technology of chitin nanocrystals and bimodal polyethylene, which is applied in the field of bimodal polyethylene products, can solve problems such as insufficient mechanical properties of bimodal polyethylene, and achieve the effect of promoting formation and increasing stability

Active Publication Date: 2018-12-07
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of insufficient mechanical properties of existing bimodal polyethylene products, and to provide a method for extrusion molding of high-strength bimodal polyethylene / chitin nanocrystalline composite materials

Method used

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  • Extrusion molding method for high strength double peak polyethylene/chitin nano crystal composite material
  • Extrusion molding method for high strength double peak polyethylene/chitin nano crystal composite material
  • Extrusion molding method for high strength double peak polyethylene/chitin nano crystal composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0036] 1000g of bimodal polyethylene with a weight average molecular weight of 210,000 and a molecular weight distribution of 24, 100mg of chitin nanocrystals with a diameter of 10nm and a length of 200nm, 1250mg of antioxidant 1010, and 1000mg of lubricant were added to the conical twin-screw extruder The bimodal polyethylene / chitin nanocrystalline composite product is obtained by extruding after uniform blending in the machine, wherein the bimodal polyethylene does not contain branched chains, the mass content of the high molecular weight part is 10%, the weight average molecular weight is 820,000, and the molecular weight distribution 3, the mass content of the low molecular weight part of bimodal polyethylene is 90%, the weight average molecular weight is 170000, and the molecular weight distribution is 4; the blending time is 0.5min; the temperature of the feed section of the extruder is 120°C, and the temperature of the compression section is 170°C, the temperature of the...

Embodiment 2

[0038] Add 1000g of bimodal polyethylene with a weight average molecular weight of 350000 and a molecular weight distribution of 35, 5g of chitin nanocrystals with a diameter of 40nm and a length of 1000nm, 800mg of antioxidant 1076, and 600mg of a flame retardant into the parallel and same direction bimodal The screw extruder is uniformly blended and then extruded to obtain a bimodal polyethylene / chitin nanocrystalline composite product, wherein the bimodal polyethylene does not contain branched chains, the mass content of the high molecular weight part is 30%, and the weight average molecular weight is 1,000,000, The molecular weight distribution is 5, the mass content of the low molecular weight part of bimodal polyethylene is 70%, the weight average molecular weight is 60000, and the molecular weight distribution is 5; the blending time is 3min; the feeding section temperature of the extruder is 130°C, the compression section temperature The temperature of the homogenizatio...

Embodiment 3

[0040] Add 1000g of bimodal polyethylene with a weight average molecular weight of 360000 and a molecular weight distribution of 36, 5g of chitin nanocrystals with a diameter of 40nm and a length of 1000nm, 800mg of antioxidant 1076, and 600mg of a flame retardant The screw extruder is uniformly blended and then extruded to obtain a bimodal polyethylene / chitin nanocrystalline composite product, wherein the bimodal polyethylene high molecular weight part has a mass content of 30%, a weight average molecular weight of 1,020,000, and a molecular weight distribution of 5. The high molecular weight part contains 30 ethyl branched chains per 10,000 carbon atoms, the mass content of the bimodal polyethylene low molecular weight part is 70%, the weight average molecular weight is 62000, and the molecular weight distribution is 5; the blending time is 3 minutes; the extruder The temperature of the feed section is 130°C, the temperature of the compression section is 200°C, the temperatur...

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Abstract

The invention relates to an extrusion molding method for a high strength double peak polyethylene / chitin nano crystal composite material. According to the method, the mechanical properties of a doublepeak polyethylene composite material extruded product can be improved effectively by selecting double peak polyethylene with a special molecular weight, adding a proper amount of chitin nano crystalsand regulating process parameters in the processing course, in particular rapid cooling after passing a mouth model, to accelerate formation of shish-kebab crystals. The method is a method which is suitable for industrial production and prepares the double peak polyethylene composite material extruded product efficiently.

Description

technical field [0001] The invention relates to the field of bimodal polyethylene products, in particular to an extrusion molding method of a high-strength bimodal polyethylene / chitin nanocrystal composite material. technical background [0002] Polyethylene is one of the five general-purpose plastics. It has the characteristics of non-toxic, low-cost, light weight, excellent moisture resistance, good chemical stability and easy molding and processing. It has a very wide range of uses in various fields of daily life. However, due to the insufficient mechanical strength of polyethylene products, its application in a wider range is severely limited. Bimodal polyethylene refers to a polyethylene resin whose molecular weight distribution curve presents two peaks. The high molecular weight part and low molecular weight part of bimodal polyethylene are uniformly mixed at the molecular level. Therefore, compared with ordinary polyethylene, bimodal polyethylene At the same time, it...

Claims

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Application Information

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IPC IPC(8): B29C47/92C08L23/06C08L5/08B29C48/92
CPCC08L23/06C08L5/08
Inventor 王宗宝别大奎朱孟杰
Owner NINGBO UNIV
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