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Radiation crosslinked polypropylene/montmorillonite composite material preparation method

A technology of cross-linked polypropylene and composite materials is applied in the field of preparation of irradiation cross-linked polypropylene/montmorillonite composite materials, which can solve the problems of unfavorable performance and influence of cross-linked polypropylene, and achieve the effect of preventing oxygen oxidative degradation.

Inactive Publication Date: 2007-05-16
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Properties of cross-linked polypropylene are adversely affected due to oxidative degradation

Method used

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  • Radiation crosslinked polypropylene/montmorillonite composite material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Maleic anhydride grafted polypropylene and organic montmorillonite are extruded and granulated in an extruder at a mass ratio of 1:1 to obtain a maleic anhydride grafted polypropylene / organic montmorillonite masterbatch, and the extruder The temperature is set at 200°C and the screw speed is 150rpm. Take 60g of maleic anhydride grafted polypropylene / organic montmorillonite masterbatch, mix it with 50g of crosslinking agent trimethylolpropane triacrylate and 1000g of polypropylene Extrude and granulate to prepare the polypropylene / organic montmorillonite material to be irradiated, and the working conditions of the extruder are the same as above. The polypropylene / organic montmorillonite material to be irradiated was irradiated with electrons in an air atmosphere, and the irradiation dose was 0.7KGy. The gel content of the composite material after radiation crosslinking was 18% after extraction with xylene.

Embodiment 2

[0023] Maleic anhydride grafted polypropylene and organic montmorillonite are extruded and granulated in an extruder at a mass ratio of 1:1 to obtain a maleic anhydride grafted polypropylene / organic montmorillonite masterbatch, and the extruder The temperature is set at 200°C, the screw speed is 150rpm, take 60g of maleic anhydride grafted polypropylene / organic montmorillonite masterbatch, mix it with 50g of crosslinking agent trimethylolpropane trimethacrylate and 1000g of polypropylene After uniformity, extrude and granulate to obtain the polypropylene / organic montmorillonite material to be irradiated. The working conditions of the extruder are the same as above. The polypropylene / organic montmorillonite material to be irradiated was irradiated with electrons in an air atmosphere, and the irradiation dose was 1.05KGy. The gel content of the composite material after radiation crosslinking was 22% after extraction with xylene.

[0024] comparative example

[0025] 30g of mal...

Embodiment 3

[0027] Get the maleic anhydride grafted polypropylene / organic montmorillonite masterbatch in 100g example 1, mix with 50g cross-linking agent trimethylol propane triacrylate, 1000g polypropylene and extrude granulation, make polypropylene / organic montmorillonite materials to be irradiated, the working conditions of the extruder are the same. The polypropylene / organic montmorillonite material to be irradiated was irradiated with electrons in an air atmosphere, and the irradiation doses were 0.35, 0.7, 1.05, and 1.4KGy, respectively. The gel content of the composite material after irradiation crosslinking was extracted with xylene, and its gel content is listed in Table 1; the composite material irradiated and unirradiated at 1.4KGy was used for dynamic mechanical testing, as shown in Figure 1. PP-MMT refers to composite materials containing montmorillonite.

[0028] comparative example

[0029] 50g of maleic anhydride grafted polypropylene was mixed with 50g of crosslinking ...

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Abstract

The invention discloses a preparing method of polypropylene / montmorillonite composite material through irradiating and crosslinking, which comprises the following steps: 1) putting polypropylene grafted by maleic anhydride and organic montmorillonite with weight rate at 1:1 in the squeezer to grain; preparing the mother material of polypropylene / montmorillonite; 2) blending 60-100g mother material, 50g crosslinking agent and 1000g polypropylene evenly; producing irradiated material of polypropylene / montmorillonite; 3) irradiating the irradiated material of polypropylene / montmorillonite in the air with irradiating dose at 0.1-2Kgy.

Description

technical field [0001] The invention relates to a preparation method of radiation crosslinked polypropylene / montmorillonite composite material. Background technique [0002] Montmorillonite is a silicate substance with a lamellar structure. After a certain amount of montmorillonite is mixed into polypropylene, the thermal stability, mechanical properties, and gas barrier properties of the system can be improved to a certain extent, but the montmorillonite Due to the polarity of the soil sheets, it is difficult for non-polar molecules to intercalate into the layers of montmorillonite. In the process of preparing polypropylene / montmorillonite composites by melt blending, compatibilizers are generally used to To improve the compatibility between polypropylene and montmorillonite, the compatibilizer usually selected is polypropylene grafted maleic anhydride. [0003] Irradiation crosslinking is to make the polymer produce macromolecular free radicals to crosslink through the ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/06C08J3/24C08J3/28B29B9/00B29C47/92C08K3/34B29C48/92
CPCB29C47/92
Inventor 范宏王永常李伯耿董凯卜志扬
Owner ZHEJIANG UNIV
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