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Preparation method of radiation-crosslinked polypropylene

A technology of radiation cross-linking and polypropylene, which is applied in the direction of sustainable manufacturing/processing, chemical industry, climate sustainability, etc., can solve the problems of difficult maintenance of decomposed gas, difficult control of foaming process, and escape of foaming gas, etc., to achieve Effects of shortened kneading time, high productivity, improved environmental aging resistance and temperature resistance

Inactive Publication Date: 2012-04-04
SICHUAN INST OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the processing temperature is higher than the melting point, the crystal melts, and the temperature range of high elastic state is very narrow, and the melt strength is low
At the same time, the air permeability of polypropylene (PP) is high, and the decomposition gas of the blowing agent is not easy to be kept in the resin.
These factors will promote the escape of foaming gas, making the foaming process difficult to control

Method used

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  • Preparation method of radiation-crosslinked polypropylene
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  • Preparation method of radiation-crosslinked polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method for radiation crosslinked polypropylene, characterized in that:

[0036] A, pulverize the polypropylene particles with a melt index of 0.5 g / 10 minutes to 200 mesh to obtain polypropylene powder;

[0037] B. Weigh an appropriate amount of cross-linking auxiliary agent and dissolve it in the solvent. The mass ratio of cross-linking auxiliary agent to solvent is: 5:100, fully dissolved, and the solvent is anhydrous ethanol solution; The stirrer is stirred, and the stirring speed is 50 rpm, and the stirring time is 20 minutes, to obtain a solution containing a crosslinking auxiliary agent;

[0038] C. Weigh the polypropylene powder described in step A, add the solution containing the cross-linking aid described in step B, and stir in a high-speed mixer at a stirring speed of 300 rpm to obtain the polypropylene powder containing the cross-linking aid mixture. Powder, every 1000 grams of the polypropylene powder is added with 400 milliliters of a soluti...

Embodiment 2

[0052] A preparation method for radiation crosslinked polypropylene, characterized in that:

[0053] A, pulverize the polypropylene particles with a melt index of 4 g / 10 minutes to 50 mesh to obtain polypropylene powder;

[0054] B. Weigh an appropriate amount of cross-linking auxiliary agent and dissolve it into the solvent. The mass ratio of cross-linking auxiliary agent to solvent is 20:100, fully dissolved, and the solvent is absolute ethanol solution; The stirrer is stirred, and the stirring speed is 500 rpm, and the stirring time is 5 minutes, to obtain a solution containing a crosslinking auxiliary agent;

[0055] C. Weigh the polypropylene powder described in step A, add the solution containing the cross-linking aid described in step B, and stir in a high-speed mixer at a stirring speed of 800 rpm to obtain the polypropylene powder containing the cross-linking aid mixture. Powder, every 1000 grams of described polypropylene powder is added the solution containing 600 ...

Embodiment 3

[0068] A preparation method for radiation crosslinked polypropylene, characterized in that:

[0069] A, pulverize the polypropylene particles with a melt index of 2 g / 10 minutes to 150 mesh to obtain polypropylene powder;

[0070] B. Weigh an appropriate amount of cross-linking auxiliary agent, dissolve it in the solvent, the mass ratio of cross-linking auxiliary agent to solvent is: 18:100, fully dissolve, the solvent is anhydrous ethanol solution; use under airtight conditions The stirrer is stirred, and the stirring speed is 300 rpm, and the stirring time is 11 minutes, to obtain a solution containing a crosslinking auxiliary agent;

[0071] C. Weigh the polypropylene powder described in step A, add the solution containing the cross-linking aid described in step B, and stir in a high-speed mixer at a stirring speed of 450 rpm to obtain the polypropylene powder containing the cross-linking aid mixture. Powder, every 1000 grams of described polypropylene powder adds 480 mill...

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Abstract

The invention discloses a preparation method of radiation-crosslinked polypropylene. According to the invention, polypropylene powder is added to a solution containing a croddlinking auxiliary agent; the mixture is processed through bake-drying, solvent removing and heat treatment; an antioxidant is added to the mixture, and the mixture is milled by using a double-roller mixing mill; the mixture is molded by extrusion or mold-pressing; and the molded polypropylene is irradiated. With the method provided by the invention, polypropylene and the croddlinking auxiliary agent can be sufficiently and uniformly mixed beforehand; the milling time can be shortened; the crosslinking efficiency can be improved; and the heat resistance and the melt strength can both be improved. In the radiation-crosslinking process, no chemical crosslinking agent is used, such that the method is environment-friendly. The crosslinking degree is uniform and controllable. The method is also advantaged in low energyconsumption and high yield. With electron radiation, environmental-aging resisting and temperature resisting performances of the polypropylene foam are substantially improved.

Description

technical field [0001] The invention relates to a preparation method of polypropylene, in particular to a preparation method of radiation crosslinked polypropylene. Background technique [0002] Polypropylene (PP) foaming material has low price, the ability to bear static load and high flexural modulus, good impact resistance, high service temperature (the maximum service temperature is as high as 130 ℃), good resistance to stress cracking, and products under high temperature It has a wide range of uses due to its dimensional stability and other advantages. [0003] Polypropylene (PP) is a crystalline polymer whose melting point is very sensitive to temperature. When the melting point is not reached, the resin has a high viscosity and almost no fluidity, so it is difficult to form when the processing temperature is lower than the melting point. When the processing temperature is higher than the melting point, the crystal melts, and the temperature range of high elastic stat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08J3/28C08J3/24B29C71/04
CPCY02P20/10
Inventor 彭朝荣陈浩刘思阳陈竹平黄科张靖倪茂君王静霞
Owner SICHUAN INST OF ATOMIC ENERGY
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