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Prepn. of composite nylon material capable of being blow moulded

A nylon composite material and nylon technology, which is applied in the field of preparation of blow-molded nylon composite materials, can solve the problems of difficulty in obtaining ionic polymers, low melt strength of nylon 6, and difficulty in blow molding, etc., and achieve improved melt strength, Broad application and industrialization prospects, the effect of improving impact toughness

Inactive Publication Date: 2003-01-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Blow-molded polymers must have suitable melt strength and viscosity, but the usual nylon 6 has low melt strength and is difficult to blow mold
The United States, Japan and other countries have patents on nylon blow molding. Lavengood et al. (U.S.Pat.No.5,043,384) have adopted nylon 6 and ABS to blend to obtain blow-molded nylon. The comprehensive performance of this material is close to nylon 6, but It is not as good as nylon 6; Subramanian et al. used functionalized polyolefins and ionic polymers to obtain blown semi-crystalline nylon composites, but ionic polymers are difficult to obtain and costly (U.S. Pat. No. 5,122,570). Research on blow molding of nylon 6 involves less

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Nylon 6, 0.3% TDI, 14.5% MAH-g-PP, and 0.2% lanthanum oxide, which are 85% by weight, are fully mixed under a high-speed mixer, and the speed of the high-speed mixer is 1200 rpm. Put the mixed material Put it into a twin-screw extruder for processing, the screw speed is 300 rpm, the temperature of the screw feeding zone, the plasticizing zone, and the mouth film are respectively 210°C, 220°C, 235°C, 235°C, 235°C, 235°C, 230°C and 225°C, the residence time of the material in the extruder is about 1.5 minutes, the extruded material is cooled in a cooling tank, pelletized by a pelletizer to obtain pellets, and dried in a vacuum oven at 110°C for 24 hours. The material can be blow molded (such as a 500ml container), and its tensile strength, heat resistance, barrier properties, etc. have not changed, and its impact strength is twice that of the original nylon 6.

Embodiment 2

[0014] The percentage by weight is 75% nylon 6, 1% ethylene glycol, 13% styrene-maleic anhydride copolymer (SMA), 10% ethylene-vinyl acetate copolymer (EVA), 1% samarium oxide, in a high-speed mixer Fully mix evenly, the high-speed mixer speed is 1000 rpm, the mixed material is put into a twin-screw extruder for processing, the screw speed is 300 rpm, and the screw feeding zone, plasticizing zone, and mouth film temperature are respectively 220°C, 225°C, 230°C, 235°C, 235°C, 230°C, 225°C and 220°C, the residence time of the material in the extruder is about 2 minutes, and the extruded material is cooled in the cooling tank and pelletized Machine dicing to obtain pellets, and dried in a vacuum oven at 110° C. for 30 hours. The material can be blow molded, and its tensile strength and heat resistance are the same as those of the original nylon 6. The impact strength at room temperature is three times higher than that of the original nylon 6. Nylon 6 is more than twice as low.

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PUM

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Abstract

There is a method of preparing the inflatable nylon complex material, and the method is as follows; add the mixture of nylon 6, chain-expanding agent or functionalized polymer and rare-earth oxie which is evenly mixed in the high-speed stirrer into the common double-screw extruding machine, then make the things in the mixture reactively commix under a certain temperature and rotate speed then extrude the commixture and make the particles, and then obtained the inflatable nylon 6 material. The invention's method is simple, the made material retains the capability of original nylon 6 and at the same time improves the impactive tenacity, the strength of its melted body is high, and it can not only be injected to shape, but also be blowed into all kinds of hollow products with complicated shape, which make its applied range greatly enlarged.

Description

Technical field: [0001] The invention relates to a preparation method of a blow-molded nylon composite material. A twin-screw extruder is used to reactively blend polycaprolactam commonly known as nylon 6 with a small amount of chain extender or functionalized polymer to increase the melt strength of nylon. Substantially improved, so that nylon can be blow molded. The invention belongs to the technical field of polymer processing. Background technique: [0002] As we all know, polyamides, that is, nylon polymers, have excellent low-temperature and high-temperature performance, good mechanical properties, high tensile strength, excellent wear resistance, good self-lubrication, good impact toughness and high barrier properties. Chemical resistance and oil resistance are outstanding, so it has been developed rapidly since its inception. Among them, polycaprolactam, that is, nylon 6, was invented by P.Schlach of I.G.Farbon in Germany in 1938. Initially, nylon 6 was mainly used...

Claims

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Application Information

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IPC IPC(8): B29C47/40C08K3/22C08L77/00
Inventor 戚嵘嵘周持兴
Owner SHANGHAI JIAO TONG UNIV
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