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RPE/UHMWPEF composite material and preparation method and application thereof

A composite material and raw material technology, applied in the field of recycling of waste polymer materials, can solve the problems of thermomechanical degradation, poor mechanical stability, balanced rigidity and toughness of composite materials, etc. Effect

Pending Publication Date: 2021-09-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the selection of raw materials for the components of the above-mentioned blending system did not make the resulting composite material achieve a balance of rigidity and toughness.
In addition, due to the large amount of impurities contained in rPE, it is difficult to melt with the rPE matrix, resulting in poor mechanical stability.
Most of the composite materials of the blending system are processed by traditional twin-screws. The polymer molecular chains are prone to thermomechanical degradation due to shearing during processing, and it is difficult to break up the agglomerated impurity particles and disperse them uniformly in the matrix. , so there are a large number of defects in the formed recycled materials, resulting in stress concentration sites, which cannot meet the performance requirements for reuse

Method used

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  • RPE/UHMWPEF composite material and preparation method and application thereof
  • RPE/UHMWPEF composite material and preparation method and application thereof
  • RPE/UHMWPEF composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This example provides 6 kinds of rPE / UHMWPEF composite materials and their preparation methods, and provides pure rPE as a basic control group.

[0037] According to the formula of sample numbers 1-6 shown in Table 1, the ingredients were mixed, pre-mixed in a high-speed mixer for 10 minutes, and then melted and co-mixed using an eccentric rotor extruder, a plasticizing and transporting equipment for polymer materials based on elongational rheology. Mixing, the temperature of each stage is 180-190-200-210 ℃, the rotor speed is 80 rpm, extrusion molding, qualitative by three rolls, cooling, and drying to obtain 6 kinds of rPE / UHMWPEF composite materials.

[0038] The above composite material was dried in a vacuum drying oven at 70°C for 8 hours, and the tensile performance test was carried out according to GB / T 1040-2006. The results are shown in Table 3. Among them, it can be seen from Table 3 that when the mass ratio of rPE, chopped UHMWPEF, calcium carbonate, POE-g-MA...

Embodiment 2

[0042] This example provides 6 kinds of rPE / UHMWPEF composite materials and their preparation methods, which are used as corresponding comparative examples in Example 1.

[0043] According to the formula of sample numbers 7 to 12 shown in Table 2, the ingredients were mixed, pre-mixed in a high-speed mixer for 10 minutes, and then melt-blended using a traditional twin-screw extruder based on shear rheology, and the temperature of each section was 180 -185-190-195-200-210-210°C, the rotor speed is 80 r / min, extruded, qualified by three rolls, cooled and dried to obtain 6 kinds of rPE / UHMWPEF composite materials.

[0044] The above composite material was dried in a vacuum oven at 70°C for 8 hours, and the tensile properties were tested according to GB / T 1040-2006. The results are shown in Table 4. Among them, comparing Table 3 and Table 4, it can be seen that the tensile strength and elongation at break of all composite materials are lower than the components of the same proport...

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Abstract

The invention discloses an rPE / UHMWPEF composite material as well as a preparation method and application thereof. The composite material comprises the raw materials in parts by mass: 70 to 90 parts of rPE, 5 to 10 parts of UHMWPEF, 10 to 20 parts of inorganic filler, 0.5 to 2 parts of an antioxidant and 5 to 10 parts of a vinyl elastomer containing polar groups. An eccentric rotor extruder based on extensional rheology is adopted for processing and preparation, in a tensile flow field, the speed gradient of a material melt is consistent with the flowing direction, calcium carbonate particles are subjected to large acting force, do not rotate and can be uniformly dispersed in a matrix, and ultra-high molecular weight polyethylene fibers are directionally arranged in the tensile direction, and finally, the directionally reinforced composite material is formed. The preparation method is simple, the obtained composite material is excellent in mechanical property, and a new method is provided for high-quality recovery of waste plastic packaging bags.

Description

technical field [0001] The invention belongs to the technical field of recycling waste polymer materials, and in particular relates to an rPE / UHMWPEF composite material and its preparation method and application. Background technique [0002] With the rapid development of the plastics industry in recent years, plastic products have gradually become an indispensable and important part of daily life, and the largest application market for plastics is the packaging industry. LDPE is widely used in the packaging industry due to its good mechanical properties, chemical resistance, low price and easy molding. [0003] However, while packaging bags bring convenience to life, waste disposal problems inevitably arise. Plastic bags are often regarded as non-recyclable plastic waste due to collection and transportation difficulties, poor performance of recycled products, and some traditional prejudices. At this stage, most of the plastic bags are disposed of by landfill and incinerat...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L51/06C08K3/26
CPCC08L23/06C08L2205/025C08L2205/03C08L2205/16C08L2207/068C08K2003/265C08L51/06C08K3/26
Inventor 何和智王毅冯彦洪黄照夏瞿金平
Owner SOUTH CHINA UNIV OF TECH
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