Method for preparing foaming product from regenerated polyethylene

A technology for recycled polyethylene and foamed products, applied in the field of polyethylene waste and solid recycling, can solve the problems of low specific gravity of polystyrene, easy to float on the water surface, natural environment damage, etc. high performance effects

Pending Publication Date: 2022-04-15
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the specific gravity of expanded polystyrene is low, it is easy to float on the water surface or drift with the wind, causing visual pollution and landscape damage
[0004] As the plastic with the highest outp

Method used

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  • Method for preparing foaming product from regenerated polyethylene
  • Method for preparing foaming product from regenerated polyethylene
  • Method for preparing foaming product from regenerated polyethylene

Examples

Experimental program
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preparation example Construction

[0044] 2. Preparation of cross-linked foamed recycled polyethylene.

[0045]Through the melt flow rate testing machine (ZRZ1452, Meters Industrial Systems Co., Ltd.), the melt index and thermal properties of recycled polyethylene recycled materials were tested according to the standard;

[0046] The regenerated low-density polyethylene with a certain melt index is rolled on an open mill (XL-KLYP3, Dongguan Xilong Electrical Machinery Equipment Co., Ltd.) with a roll temperature of 110°C;

[0047] Adding 5wt% microsphere blowing agent Expancel, 1wt% dicumyl peroxide and 1wt% zinc stearate for mixing;

[0048] After 8 minutes, remove the mixed material, and quickly put the mixed material into a mold of 185×135×6mm while it is hot;

[0049] Then put the mold into a flat vulcanizing machine (XLB-D(Y) 350×350×2, Qingdao Xinhuaqing Rubber Machinery Co., Ltd.), heat and press at 200°C for 10 minutes;

[0050] The mold is opened to take the board out of the mold cavity, cooled and s...

Embodiment 1

[0061] 1. Prepare the recycled polyethylene cable material, and test the melt index and thermal performance.

[0062] Specifically, the melt flow rate test is carried out: according to GB / T 3682-2000, the melt index of recycled polyethylene is measured by a melt flow rate tester (ZRZ1452, Meters Industrial Systems Co., Ltd. Shenzhen Branch), at a temperature of 190°C, 2.16Kg, record the quality of the melt outflow every 30s, extrude 5 times, take the average value as the final extrusion quality, and obtain the melt index after conversion.

[0063] Differential scanning calorimetry (DSC) curves of recycled polyethylene and cross-linked foamed recycled polyethylene cable materials. The process of obtaining the corresponding curve includes: using a differential scanning calorimeter (204F1, Netzsch, Germany), to obtain the melting behavior of the sample under a nitrogen atmosphere, take about 10 mg of the sample, and the nitrogen flow rate is 20 mL min -1 , Heating rate 10℃min -...

Embodiment 2

[0074] 1. Prepare recycled polyethylene Tetra Pak packaging materials, test the melt index and thermal properties, as above.

[0075] The melt index (MI) of recycled polyethylene Tetra Pak is 0.5g / 10min (2.16kg, 190°C), and its main component is low-density polyethylene with a melting point of 106°C, which is low-density polyethylene.

[0076] 2. Prepare cross-linked foamed recycled polyethylene Tetra Pak packaging according to the following method.

[0077] 1) Roll a certain amount of recycled low-density polyethylene Tetra Pak packaging material on an open mill at 110°C;

[0078] 2) adding 5wt% microsphere blowing agent Expancel, 1wt% dicumyl peroxide and 1wt% zinc stearate for mixing;

[0079] 3) After 8 minutes, remove the mixed material, and quickly put the mixed material into the plate mold while it is hot;

[0080] 4) Put the mold into a flat vulcanizing machine, heat and press at 200°C for 10 minutes;

[0081] 5) Open the mold and take the plate out of the mold cavi...

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Abstract

The invention discloses a method for preparing a foaming product by utilizing regenerated polyethylene, and relates to polyethylene waste solid recycling. Three kinds of regenerated polyethylene are used as raw materials, a cable material, a Tetra Pak packaging material, a film spraying material and thermal expansion microspheres are used as foaming agents, and three kinds of cross-linked foaming polyethylene products are prepared through peroxide cross-linking, physical foaming and compression molding. A synchronous thermal analyzer, a scanning electron microscope, a pendulum impact testing machine, an electronic universal testing machine and the like are used for characterizing and analyzing the thermal properties, the morphology, the impact resistance and the tensile property of the prepared cross-linked foamed polyethylene product. Wherein the comprehensive performance of the cross-linked foaming product based on the regenerated polyethylene lamination material is optimal, and the cross-linked foaming product is expected to be used for producing various types of water products such as buoys and buoyancy balls. The method has important significance in developing a polyethylene recycling channel, promoting cyclic utilization of plastic products and realizing sustainable development of resources.

Description

technical field [0001] The invention relates to the reuse of polyethylene waste solids, in particular to a method for preparing foamed products from recycled polyethylene with good mechanical properties and anti-aging properties through a physical foaming method. Background technique [0002] Foamed polymer materials are a new type of polymer material with micron-sized pores and independently distributed cells. Its unique pore structure endows foamed polymer materials with light weight, heat insulation, shock absorption and good mechanical properties. advantage. Floats and buoyancy balls used in fishing industry are one of the main application fields of foamed polymer materials. [0003] Most fishery products use polystyrene as raw material. Polystyrene has problems such as high brittleness and poor heat resistance. When it is used as a foaming material, it has disadvantages such as easy cell rupture and poor impact resistance. In addition, polystyrene easily enters the e...

Claims

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Application Information

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IPC IPC(8): C08J9/32C08L23/06C08K5/14C08K5/098C08J5/18
Inventor 李磊陈明焕雷育杰夏云霞
Owner XIAMEN UNIV
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