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Preparation method of calcium carbonate-filled high-performance degradable polyethylene film

A technology of polyethylene film and high-density polyethylene, which is applied in the field of preparation of calcium carbonate high-filling high-performance degradable polyethylene film, can solve the problems of good chemical stability of polyethylene, decreased mechanical properties of the film, and serious white pollution, etc. Achieve the effect of low cost, good mechanical properties and environmental friendliness

Inactive Publication Date: 2013-12-11
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the good chemical stability of polyethylene, it is difficult to degrade naturally, a large number of polyethylene films are discarded after only one use, and the "white pollution" caused by waste plastic products is becoming more and more serious
[0004] The amount of inorganic substances in the current inorganic powder-filled polyethylene film materials is generally low, generally not more than 30%, and the mechanical properties of the film will drop sharply after being highly filled with inorganic substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] A preparation method of calcium carbonate highly filled high-performance degradable polyethylene film, characterized in that: comprising the following steps:

[0025] 1) Dry the calcium carbonate;

[0026] 2) Fully mix the dried calcium carbonate with the coupling agent at a mass ratio of 100:0.5-3;

[0027] 3) Fully mix high-density polyethylene, EVA, and calcium carbonate treated in the previous step;

[0028] 4) Add the photodegradant to the mixture in the upward step and mix well;

[0029] 5) Put the mixture obtained in the previous step into the extruder to melt, extrude and granulate;

[0030] 6) Put the pellets obtained in the previous step into the film blowing machine and blow them into films.

[0031] In step 1), the mesh number of the calcium carbonate is ≥800 mesh, and the calcium carbonate is dried to a moisture content of ≤0.1%.

[0032] Described calcium carbonate is at least one in heavy calcium carbonate, light calcium carbonate.

[0033] The coupl...

Embodiment 1

[0041] First, select 1 kg of heavy calcium carbonate with a fineness of 800 mesh and dry it at 150°C for 3 hours, then add the dried calcium carbonate into a high-speed mixer, and add 5 grams of titanate coupling agent AT2-TMC -311w is also added to the high-speed mixer, mixed for 5 minutes, then add 1 kg of high-density polyethylene and EVA (of which, the high-density polyethylene is 0.5Kg), after mixing for 10 minutes, add photodegradant cerium stearate 5 grams, continue to mix for 5 minutes, then take out the mixture, add it to the screw extruder, melt and extrude it in the temperature range of 170 ~ 230 ° C, pelletize, and directly add the prepared pellets to the film blowing machine, at 160 The target polyethylene film material can be obtained by blow molding within the range of ~200°C, with an inflation ratio of 4.

Embodiment 2

[0043] First, select 2 kg of heavy calcium carbonate with a fineness of 2000 mesh and dry it at 150°C for 3 hours, then add the dried calcium carbonate to the high-speed mixer, and add 40 grams of silane coupling agent KH550 to the high-speed Mixer, mix for 8 minutes, then add 1 kg of high-density polyethylene and EVA (of which, the high-density polyethylene is 0.6Kg), after mixing for 10 minutes, add 5 grams of photodegradant iron stearate, and continue mixing for 8 minutes , then take out the mixture, add it to the screw extruder, melt and extrude it in the temperature range of 170-230°C, granulate, directly add the prepared pellets into the film blowing machine, and blow it in the range of 160-200°C Plastic, the inflation ratio is 2, and the target polyethylene film material can be obtained.

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Abstract

A preparation method of a calcium carbonate-filled high-performance degradable polyethylene film comprises the following steps: 1, drying calcium carbonate; 2, fully mixing dried calcium carbonate with a coupling agent according to a mass ratio of 100:0.5-3; 3, fully mixing high density polyethylene, EVA and calcium carbonate obtained in step 2; 4, adding a photodegradation agent to a mixture obtained in step 3, and uniformly mixing; 5, adding a mixture obtained in step 4 to an extruder, and carrying out fusing extrusion and granulation; and 6, adding granules obtained in step 5 to a film blowing machine, and carrying out blow molding to form the film. The polyethylene film prepared in the invention has the advantages of low cost, good mechanical performances, high tensile strength and elongation at break, degradability and environmental protection.

Description

technical field [0001] The invention relates to a preparation method of a high-calcium carbonate-filled high-performance degradable polyethylene film. Background technique [0002] Polyethylene film is widely used in shopping bags, garbage bags, packaging and agricultural mulch, and with the development of society, the application of polyethylene film will continue to grow rapidly. Polyethylene is a resin made from petroleum, and petroleum is a non-renewable resource, and the international petroleum price remains high. Therefore, adding calcium carbonate to polyethylene film can not only reduce production costs, but also save precious petroleum resources. [0003] Because polyethylene has good chemical stability and is difficult to degrade naturally, a large number of polyethylene films are discarded after only one use, and the "white pollution" caused by waste plastic products is becoming more and more serious. [0004] The amount of inorganic substances in the current ino...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/08C08K13/06C08K9/06C08K9/04C08K3/26C08K5/098B29C49/00
Inventor 杨丽庭李国明朱鹤谢胜李彦涛曾聪
Owner SOUTH CHINA NORMAL UNIVERSITY
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