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Injection molding method of bimodal polyethylene product

A bimodal polyethylene injection molding technology, which is applied in the field of injection molding of high-strength branched bimodal polyethylene products, can solve the problems of insufficient mechanical properties of bimodal polyethylene products, 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

[0006] The purpose of the present invention is to provide an injection molding method for high-strength bimodal polyethylene products in order to solve the problem of insufficient mechanical properties of existing bimodal polyethylene products

Method used

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  • Injection molding method of bimodal polyethylene product
  • Injection molding method of bimodal polyethylene product
  • Injection molding method of bimodal polyethylene product

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Add 1000g of bimodal polyethylene with a weight average molecular weight of 210000 and a molecular weight distribution of 24, 1250mg of antioxidant 1010, and 1000mg of lubricant into a screw injection molding machine for injection molding to obtain bimodal polyethylene products, wherein the high molecular weight part of bimodal polyethylene The mass content is 10%, the weight average molecular weight is 820,000, the molecular weight distribution is 3, and the high molecular weight part contains 60 ethyl branched chains per 10,000 carbon atoms; the mass content of the bimodal polyethylene low molecular weight part is 90%, and the weight average molecular weight 170000, the molecular weight distribution is 4; the material is melted at 150°C during the injection molding stage, the temperature through the nozzle is 150°C, the injection pressure is 350MPa, the holding pressure is 240MPa, the holding time is 10s, the mold temperature is 30°C, and the cooling rate 30°C / min.

Embodiment 2

[0034] Add 1,000g of bimodal polyethylene with a weight average molecular weight of 350,000 and a molecular weight distribution of 35, 800mg of antioxidant 1076, and 600mg of a flame retardant into a screw injection molding machine for injection molding to obtain bimodal polyethylene products, wherein the bimodal polyethylene has a high molecular weight The mass content of the part is 30%, the weight average molecular weight is 1,000,000, and the molecular weight distribution is 5. The high molecular weight part contains 30 butyl branches per 10,000 carbon atoms; the mass content of the low molecular weight part of bimodal polyethylene is 70%, and the weight average The molecular weight is 60000, the molecular weight distribution is 5; the material is melted at 178°C during the injection molding stage, the temperature passing through the nozzle is 183°C, the injection pressure is 300MPa, the holding pressure is 200MPa, the holding time is 20s, the mold temperature is 20°C, the c...

Embodiment 3

[0036] Add 1,000 g of bimodal polyethylene with a weight average molecular weight of 500,000 and a molecular weight distribution of 47 and 900 mg of antioxidant 168 into a screw injection molding machine for injection molding to obtain bimodal polyethylene products, wherein the high molecular weight part of bimodal polyethylene has a mass content of 42 %, the weight-average molecular weight is 1,200,000, and the molecular weight distribution is 7. The high molecular weight part contains 20 hexyl branched chains per 10,000 carbon atoms; In the injection molding stage, the material is melted at 190°C, the temperature through the nozzle is 198°C, the injection pressure is 200MPa, the holding pressure is 100MPa, the holding time is 30s, the mold temperature is 30°C, and the cooling rate is 50°C / min.

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Abstract

The invention relates to an injection molding method of a bimodal polyethylene product. Bimodal polyethylene with the specific molecular weight is selected, and the recovery time of extended chains inprocessing melt is increased through moderate branching of molecular chains of the high-molecular-weight part of the bimodal polyethylene. Formation of shish-kebab crystals is promoted by regulatingand controlling technological parameters during processing and through fast cooling on a mold. The mechanical properties of the bimodal polyethylene product are effectively improved. The injection molding method is suitable for industrial production and high-efficiency preparation of the bimodal polyethylene product.

Description

technical field [0001] The invention relates to the field of bimodal polyethylene products, in particular to an injection molding method for high-strength branched bimodal polyethylene products. Background technique [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 engineering fields 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 has excellent p...

Claims

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Application Information

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IPC IPC(8): B29C45/76B29C45/78B29C45/77C08L23/06
CPCB29C45/76B29C45/77B29C45/78B29C2945/76498B29C2945/76531B29C2945/76595C08L23/06C08L2205/025
Inventor 王宗宝别大奎段天臣
Owner NINGBO UNIV
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