Preparation method of long chain branched polyethylene

A polyethylene and long-branched technology, applied in the field of long-branched polyethylene preparation, can solve the problems of difficulty in stability, thickness limitation and high cost, and achieve the effects of excellent foaming performance, controllable branching degree and high productivity

Active Publication Date: 2012-10-31
SHANGHAI FUYUAN PLASTICS SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, generally speaking, the irradiation method is limited by the thickness, and has disadvantages such as high cost and limited radiation source; the peroxide cross-linking method has defects such as low branching rate, easy degradation or excessive cross-linking, and difficulty in stabilization; and The silane cross-linking met...

Method used

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  • Preparation method of long chain branched polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1 carries out the preparation of long branched polyethylene in solution:

[0050] Take 100 grams of polyethylene 2200J (Daqing Petrochemical, melt index 6.0g / 10min), put it into a 2000ml flask, then add 1300 grams of xylene, and gradually raise the temperature to 130°C. After all the solids were dissolved, 2 grams of acrylic acid and 2 grams of styrene were added, and then 0.36 grams of benzoyl peroxide were added to the flask in 5 times within 30 minutes, and the reaction was maintained at 130°C. After the reaction, the flask was cooled to room temperature, 100 g of acetone was added, and after stirring, the solid was completely precipitated, and then dried in a vacuum oven to obtain grafted polyethylene. The results of the grafting ratio of acrylic acid and polyethylene are shown in Table 1.

[0051] Take 49g of grafted polyethylene prepared by the above method and 0.24g of 1010 antioxidant and add it to a 2000ml flask, then add 1000g of xylene, and gradua...

Embodiment 2

[0053] Embodiment 2 carries out the preparation of long-branched polyethylene by melting method:

[0054] Get 10 kilograms of polyethylene 2200J (Daqing Petrochemical, melt index 6.0g / 10min), 0.2 kilograms of glycidyl methacrylate graft monomer, 0.2 kilogram of styrene, 36 grams of dicumyl peroxide, diisopropyl peroxide Propylbenzene was dissolved in the monomers of glycidyl methacrylate and styrene, and then they were all put into a high-speed mixer and mixed for 2 minutes before discharging. The mixture was added to a twin-screw extruder that had been preheated to 170° C., and extruded at a speed of 50 rpm. The extruded product is pelletized to obtain grafted polyethylene. The results of the grafting ratio of glycidyl methacrylate to polyethylene are shown in Table 1.

[0055] Get 4.9 kilograms of graft polyethylene prepared by the above method, 20 grams of antioxidant, 20 grams of catalyzer, 100 grams of pine sawdust, and then all put into a high-speed mixer and mix for 2...

Embodiment 3

[0057] Embodiment 3: The grafting method is the same as that of Embodiment 2, except that maleic anhydride is used as a grafting monomer to carry out grafting reaction with polyethylene. The method that it reacts with the filler pine sawdust is also exactly the same as in Example 2. The results of the grafting ratio of maleic anhydride and polyethylene and the properties of the obtained long-branched polyethylene are listed in Table 1.

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Abstract

The invention discloses a preparation method of long chain branched polyethylene. The preparation method comprises the following steps of: A, under the action of an initiator, performing a graft reaction on a vinyl monomer containing a polyfunctional group, and a polyethylene substrate under the synergistic action of a second olefin monomer to obtain grafted polyethylene of which the side chain is provided with a functional group; B, and performing a branching reaction on the grafted polyethylene obtained in the step A and an additive to obtain long chain branched polyethylene in which the additive is taken as a core and a polyethylene macromolecule is taken as an arm. Due to the adoption of the preparation method disclosed by the invention, long chain branched polyethylene with high melt strength can be produced, the branching degree is relatively controllable, the cost is low, the production efficiency is high, and superior foaming performance is realized. Expanded polyethylene with various functionality such as a wood-plastic composite expanded material added with wood fiber, an enhanced polyethylene expanded material added with glass fiber, a fire-proof polyethylene expanded material added with an expansion flame retardant and the like can be prepared according to different use requirements.

Description

technical field [0001] The invention relates to organic chemical products, in particular to a preparation method of long-branched polyethylene. Background technique [0002] Polyethylene resin is one of the most widely used thermoplastic polymer materials. The polyethylene foam material obtained by foaming technology from polyethylene resin is widely used because of its soft quality, good toughness, excellent elastic recovery performance, and non-toxicity. However, among the types of polyethylene resins, only low-density polyethylene and linear low-density polyethylene can be directly used for foaming, while high-density polyethylene cannot be used for foaming due to its lack of branched structure and low melt strength. forming. However, on the other hand, although low-density polyethylene and linear low-density polyethylene have relatively good foaming properties, due to their high melt flow rate, it is difficult to process foamed boards with a thickness of more than 20 c...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08G83/00C08F255/02C08H8/00C08B31/00
Inventor 李书召郑安呐危大福管涌胡福增王书忠
Owner SHANGHAI FUYUAN PLASTICS SCI CO LTD
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