A kind of polypropylene foam composition and its preparation method and application

Abstract

The invention relates to a polypropylene foam composition. The polypropylene foam composition is prepared by adopting the following components by weight percent: 40.5 to 86.4 percent of polypropylene, 5 to 25 percent of high-melt-strength polypropylene, 5 to 20 percent of high-density polyethylene, 3 to 10 percent of ethylene-propylene copolymer, 0.3 to 1.5 percent of foaming agent, 0.1 to 1 percent of antioxidant, 0.1 to 1 percent of silane coupling agent and 0.1 to 1 percent of lubricating agent; the polypropylene is the polypropylene of other types except for the high-melt-strength polypropylene. The invention also provides a preparation method and application of the polypropylene foam composition. The polypropylene foam composition has the advantages of uniform foam pores, high physical heat resistance and the like. A communication wire prepared by adopting the polypropylene foam composition has a smooth surface; moreover, a communication cable with the wall thickness less than or equal to 0.5mm can be prepared. In addition, the preparation method is simple and easy to operate.

Description

technical field [0001] The invention relates to a foam composition, in particular to a polypropylene foam composition and its preparation method and application. Background technique [0002] In the past, intelligent electronic communication data lines such as USB 3.0, HDMI and VGA were mostly made of polyethylene foam composition, and the matrix was high-density polyethylene (HDPE) material. For example, Chinese Patent Publication No. CN02135233, the publication date is December 31, 2003, the name of the invention is polyethylene foam insulation composition for communication cables and its preparation method, and the application discloses a polyethylene foam insulation composition for communication cables and preparation method. Its shortcoming is that the high-density polyethylene material is soft after foaming, and it is easy to deform under the increasingly miniaturized and lightweight wiring requirements, and the decomposition product of the azodicarbonamide foaming ag...

AI Technical Summary

Problems solved by technology

Its shortcoming is that the high-density polyethylene material is soft after foaming, and it is easy to deform under the increasingly miniaturized and lightweight wiring requirements, and the decomposition product of the azodicarbonamide foaming agent (ADC) used is easy Corrosion screw, clogged extruder screen

[0005] Chinese patent CN 201010172308.6, published on September 15, 2010, discloses a foamed polypropylene material and its preparation method; Chinese patent CN201110205602.7, published on January 23, 2013, discloses a halogen-free resistor Burning polypropylene foaming material and its preparation method; Chinese patent CN201110250520.4, published on November 24, 2011, discloses a foaming polypropylene material; the disadvantage of the above three open patents is that ADC is non-environmentally friendly foaming agent, and is not suitable for use in the field of communication cables;

[0006] Chinese patent CN 200810196062.9, published on January 28, 2009, discloses an environmentally friendly micro-foamed polypropylene sheet and its preparation method. In this invention, a citric acid-based foaming agent (a mixture of citric acid and baking soda) is used to prepare Foamed polypropylene, this combination has the characteristics of light weight, environmental protection, and temperature resistance of 120°C, but the decomposition temperature of the foaming agent mixed with citric acid and baking soda is lower than 150°C, and the foaming is slow and uneven. It will foam in advance and cannot be granulated;

[0007] Chinese patent CN 201410090298.X, published on June 18, 2014, discloses an insulator for a radio frequency coaxial cable. In this invention, a physical foaming agent is used to prepare a polypropylene foam insulation layer for a radio frequency coaxial cable. Due to nitrogen, Physical foaming equipment such as carbon dioxide and argon is expensive, the process control is complicated, and the foaming degree is as high as 80%, so it is not suitable for the preparation of communication wire materials with small wire diameters and insulation layer thicknesses less than 0.05mm;

The disadvantage of this patent is that ordinary polypropylene is used for the foaming composition, and it is difficult to obtain small-diameter cells, so it is only suitable for the preparation of communication wires with a larger diameter (about 2mm), and a non-environmentally friendly foaming agent is used

[0009] In summary, the existing chemically foamed polypropylene materials are difficult to meet the requirements of communication cables with thin-wall insulation (wall thickness less than 0.05mm), especially the material requirements of the USB 3.1 standard.

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