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Modified polypropylene and preparation method thereof

A polypropylene and polypropylene resin technology, applied in the field of modified polypropylene and its preparation, can solve the problems of reducing medical material security, organic peroxide explosion, affecting mechanical bacteria/virus filtration performance, etc.

Inactive Publication Date: 2020-08-11
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the additive organic peroxide has small molecule residues and strong odor after thermal decomposition, it is difficult to completely remove the small molecule monomer even if a vacuum devolatilization device is added to the twin-screw extruder, even the organic peroxide Static electricity generated during the mixing process with polypropylene powder may cause explosion risks caused by organic peroxides; in addition, high-fluidity polypropylene is the basic raw material of melt-blown polypropylene. It takes 7-14 days to analyze before it can be used, and the guarantee of medical supplies will be greatly reduced in special periods such as during the epidemic
The radiation sterilization cycle is short, safe and environmentally friendly, but the molecular weight of polypropylene will be further degraded during the sterilization process, which will affect the mechanics and bacteria / virus filtration performance of products such as masks prepared from polypropylene; at the same time, polypropylene lacks antibacterial / antiviral functions

Method used

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  • Modified polypropylene and preparation method thereof

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[0019] In view of the problems of strong taste of additives, easy explosion and lack of antibacterial / antiviral functions in the preparation of ultra-high melt fluidity polypropylene in the prior art, this application provides a preparation method of modified polypropylene, which is obtained by introducing pre-irradiated polypropylene Propylene, double bond-containing reactive hindered amine radiation-resistant agent, lubricant and hydrophobic polyelectrolyte antibacterial / antiviral compound, so that the obtained modified polypropylene has a higher melt index, radiation resistance and antibacterial / antibacterial Antiviral. Specifically, the embodiment of the present invention discloses a preparation method of modified polypropylene, comprising:

[0020] The modified polypropylene is obtained by mixing polypropylene resin, pre-irradiated polypropylene, double bond-containing reactive hindered amine radiation resistance agent, lubricant and hydrophobic polyelectrolyte antibacter...

Embodiment 1

[0033] 1000g of polypropylene resin Z30S (melt index 30g / 10min (230°C, 2.16kg), Dalian Xitai Petrochemical Co., Ltd.), 600g of the above-mentioned polypropylene resin was irradiated by an electron accelerator at 200kGy, 4g of 4-acrylamide-2, 2,6,6-tetramethylpiperidine, 50g polyhexamethylene biguanide hydrochloride-sodium stearate antibacterial / antiviral compound, 2g ethylene bis stearamide are mixed in high mixer, then Put the obtained mixture into a twin-screw extruder for melt degradation and reactive extrusion grafting. The extrusion temperature is 250°C, the screw speed is 150rpm, and the residence time of the mixture is 0.9min. Stranding, cooling, pelletizing, and drying, The modified high-fluidity polypropylene was obtained, and the physical properties of the product are shown in Table 1.

[0034] Preparation method of polyhexamethylene biguanide hydrochloride-sodium stearate antibacterial / antiviral compound: respectively configure 1.5%wt / v polyhexamethylene biguanide h...

Embodiment 2

[0036] 1000g of polypropylene resin T30S (melt index 3.0g / 10min (230°C, 2.16kg), Daqing Petrochemical), 400g of the above-mentioned polypropylene resin was irradiated by an electron accelerator at 100kGy, 3g of 4-acrylamide-2,2,6, 6-Tetramethylpiperidine, 50g heparin sodium-benzalkonium chloride antibacterial / antiviral complex, 3g ethylene bisstearamide are mixed in a high mixer, and then the resulting mixture is added to a twin-screw extruder Carry out melt degradation and reactive extrusion grafting, the extrusion temperature is 220°C, the screw speed is 150rpm, the residence time of the mixture is 1.0min, the strands are drawn, cooled, pelletized, and dried to obtain modified high-fluidity polypropylene. As shown in Table 1.

[0037] Preparation method of heparin sodium-benzalkonium chloride antibacterial / antiviral complex: respectively configure the aqueous solution of heparin sodium and benzalkonium chloride of 1.5%wt / v, mix the two at room temperature to form a water-ins...

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Abstract

The invention provides a preparation method of modified polypropylene. The preparation method comprises the following steps: mixing polypropylene resin, pre-irradiated polypropylene, a double-bond-containing reactive hindered amine radiation-resistant agent, a lubricant and a hydrophobic polyelectrolyte antibacterial / antiviral compound, and carrying out a melting reaction to obtain the modified polypropylene. The invention also provides the modified polypropylene. The modified polypropylene prepared in the invention has the characteristics of high fluidity, irradiation resistance, antibiosis and antivirus, has a high melt index, and can be used for preparing polypropylene special materials for melt blowing.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a modified polypropylene and a preparation method thereof. Background technique [0002] Ultra-high melt fluidity polypropylene is the basic raw material for melt-blown polypropylene. At present, there are two main methods for the preparation of high-fluidity polypropylene: one is directly polymerized by a metallocene catalyst, and the high-fluidity polypropylene obtained by this method is Polypropylene has good processing stability, but the processing cost of this method is high; another method is to degrade conventionally polymerized polypropylene through controlled degradation. This method is widely used because of its simple preparation process. The above degradation methods usually add organic peroxide initiators to conventional polypropylene, such as dicumyl peroxide, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, Benzoyl peroxide and other additives are melted an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/06C08L23/12C08L79/00C08L5/10C08K5/098C08K5/20C08K5/19C08F255/02C08F220/60
CPCC08F255/02C08L51/06C08L2201/08C08L2205/025C08L2205/035C08L23/12C08L79/00C08K5/098C08K5/20C08L5/10C08K5/19C08F220/60
Inventor 石恒冲栾世方殷敬华杨华伟于许杰
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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