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Method for preparing plastic pipe fitting from polyethylene terephthalate (PET) bottle reclaimed material

A technology of polyethylene terephthalate and plastic pipe fittings, which is applied in the direction of pipes/pipe joints/fittings, pipes, rigid pipes, etc. It can solve the problems of high injection molding temperature, slow crystallization speed, and poor impact performance. Achieve improved compatibility, low cost, improved notched impact strength and compression resilience

Inactive Publication Date: 2010-07-21
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of slow crystallization speed, high injection molding temperature, long molding cycle, high brittleness and poor impact performance in the process of processing PET bottle recycled materials, the invention provides a method for preparing plastic pipe fittings from PET bottle recycled materials , this method uses PET bottle recycled material and m-LLDPE as basic raw materials, adds compatibilizer, lanthanum oxide, antioxidant 1010, and processes through crushing, high-speed mixing, twin-screw extrusion pelletizing, and injection molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] After the recycled PET bottle is cleaned of dust and impurities, put it in a crusher, crush it into recycled material fragments of about 2mm×2mm, put it in a constant temperature blast drying oven, control the temperature at 140°C, and dry it for 8 hours, then weigh the PET bottle for recycling Put 65Kg of material in a high-speed mixer, control the rotation speed of the mixer to 250r / min, and the temperature to 100°C, and add the density of 0.916g / cm 3 24Kg of m-LLDPE with a melt flow rate of 1.0g / 10min, 2.4Kg of compatibilizer mixed with EAA1.5Kg and POE0.9Kg, 0.7Kg of lanthanum oxide and 10100.6Kg of antioxidant with a purity of 99.5% by mass, stirring Mix for 8 minutes; place in the hopper of a co-rotating twin-screw extruder, and control the temperature of the extruder barrel: Zone I 188°C, Zone II 201°C, Zone III 213°C, Zone IV 225°C, Zone V 235°C, Zone VI 248°C, die head 245°C, extrude and cut into pellets; then put it in the injection molding machine, control th...

Embodiment 2

[0018] After the recycled PET bottle is cleaned of dust and impurities, put it in a crusher, crush it into recycled material fragments of about 2mm×2mm, put it in a constant temperature blast drying oven, control the temperature at 141°C, and dry it for 8 hours, then weigh the PET bottle for recycling 72Kg of material is placed in a high-speed mixer, the mixer speed is controlled to 250r / min, the temperature is 99°C, and the density is 0.916g / cm 3 , M-LLDPE30Kg with a melt flow rate of 1.2g / 10min, EAA1.8Kg and POE1.6Kg mixed compatibilizer 3.4Kg, lanthanum oxide 1.0Kg with a purity of 99.5% by mass and antioxidant 10100.8Kg, stirred Mix for 8 minutes; place in the hopper of a co-rotating twin-screw extruder, and control the temperature of the extruder barrel: Zone I 186°C, Zone II 199°C, Zone III 211°C, Zone IV 223°C, Zone V 233°C, Zone VI 246°C, die head 244°C, extrude and cut into pellets; then put it in the injection molding machine, control the barrel temperature of the in...

Embodiment 3

[0021] After the recycled PET bottle is cleaned of dust and impurities, put it in a crusher, crush it into recycled material fragments of about 2mm×2mm, put it in a constant temperature blast drying oven, control the temperature at 139°C, and dry it for 8 hours, then weigh the PET bottle for recycling Put 68Kg of material in a high-speed mixer, control the rotation speed of the mixer to 250r / min, and the temperature to 101°C, and add in sequence with a density of 0.926g / cm 3 , M-LLDPE27Kg with a melt flow rate of 0.85g / 10min, EAA1.6Kg and POE1.2Kg mixed compatibilizer 2.8Kg, lanthanum oxide 0.9Kg with a purity of 99.5% by mass and antioxidant 10100.7Kg, stirred Mix for 8 minutes; place in the hopper of a co-rotating twin-screw extruder, and control the temperature of the extruder barrel: Zone I 190°C, Zone II 203°C, Zone III 215°C, Zone IV 226°C, Zone V 237°C, Zone VI 250°C, die head 248°C, extrude and cut into pellets; then put it in the injection molding machine, control the...

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Abstract

The invention relates to a method for preparing a plastic pipe fitting from a PET bottle reclaimed material, which comprises the following steps: taking 63-74 parts by weight of the PET bottle reclaimed material and 22-32 parts by weight of m-LLDPE as raw materials, adding 2-4 parts by weight of compatilizer, 0.6-1.2 parts by weight of lanthanum oxide and 0.5-1.0 part by weight of antioxidant 1010, pulverizing, mixing at high speed, extruding and pelleting by a twin screw, and injection molding to process the pipe fitting. The compatilizer is prepared by mixing an ethylene-acrylic acid copolymer and an ethylene-octylene copolymer in proportion by weight of 1:0.5-0.9. Compared with the pipe fittings manufactured from unmodified PET bottle reclaimed materials, the pipe fitting prepared by the method has the advantages that the notch impact strength is improved by 45%-55%, the compression resilience rate is improved by 22%-26%, and the rate of finished products of injection pipe fittings is improved by 18-23%; and the pipe fitting has the characteristics of high anti-impact strength, good pressure resistance, lustrous surface, low cost and the like, and is suitable for drainage and sewage pipe fittings in municipal works and water-saving irrigation pipe fittings in agriculture.

Description

technical field [0001] The invention relates to a method for preparing plastic pipe fittings, in particular to a method for preparing plastic pipe fittings from recycled polyethylene terephthalate bottles. Background technique [0002] As a thermoplastic engineering plastic, polyethylene terephthalate (PET) is widely used in film, synthetic fiber, electrical appliances, packaging bottles and other fields because of its high mechanical strength, excellent heat resistance and chemical resistance. . With the rapid development of the food and beverage industry, PET bottles have been widely used in the packaging of mineral water, carbonated beverages, fruit juices, tea beverages, etc. According to reports, in recent years, the annual output of PET bottles has exceeded 1.2 million tons. Most of the PET bottles are disposable, causing waste of resources and environmental pollution. At present, most of the recycled PET bottles are used for polyester staple fibers. The value is low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L23/08C08L33/02C08L23/20C08K13/02C08K3/22B29B9/06B29C47/92B29C45/78F16L9/12B29C48/405B29C48/92
CPCB29C48/92B29C2948/92704B29C48/04B29C48/09B29C48/9185B29C2948/92895B29C2948/92904B29C48/405
Inventor 张华集陈晓张雯
Owner FUJIAN NORMAL UNIV
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