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Foam polypropylene material in pulsating shear force field and preparation method thereof

A polypropylene material and polypropylene resin technology, which is applied in the field of foamed polypropylene material and its preparation under the action of pulsating shear force field, can solve the problem of insufficient back pressure, uneven size of microscopic cell structure, and unsatisfactory mixing effect. and other problems, to achieve the effect of easy promotion, low investment and simple manufacturing process

Inactive Publication Date: 2013-06-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the ordinary extrusion foaming method, the mixing and foaming of the materials are completed in the screw extruder at one time, resulting in unsatisfactory mixing effects or insufficient back pressure.
The size of the microscopic cell structure of the foamed product is uneven, and it is difficult to control the stability of continuous extrusion foaming

Method used

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  • Foam polypropylene material in pulsating shear force field and preparation method thereof
  • Foam polypropylene material in pulsating shear force field and preparation method thereof
  • Foam polypropylene material in pulsating shear force field and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Please see attached figure 1 , 2, take high-melt-strength polypropylene resin (melt strength is 0.5-0.8N), its consumption is in 100 parts, and other material consumptions are added with reference to matrix resin quality; Foaming agent azodicarbonamide 2.5wt% ; 3250 mesh superfine nucleating agent silicon dioxide 1.2wt%; organic zinc stearate and zinc oxide consumption ratio is 0.5wt% for the compounding dosage of foaming agent auxiliary agent of 9: 1; processing aid liquid paraffin oil consumption 0.6wt%.

[0033] The processing process is divided into foaming material premixing and extrusion processing, in which the material premixing is carried out separately: the nucleating agent, foaming agent and foaming agent auxiliary agent of the powder material are weighed and then premixed for the first time, high melting The bulk-strength polypropylene resin and the paraffin oil of the polymer processing aid are placed in the mixer and mixed at a low speed for 10-15 minutes...

Embodiment 2

[0037] On the basis of Example 1, the effect of the excitation unit 2 is introduced into the extrusion process, thereby generating a pulsating shear force field with an amplitude of 0.10 mm and a frequency of 10 Hz. The extruded foamed product is cooled by cooling water Cool and shape the finished product.

[0038] Determination of the technical parameters of the extruded product is that the foaming ratio of the foaming material is 7 times, and the foam bulk density is 130Kg / m 3 , the number average cell size can be controlled at around 120 μm.

Embodiment 3

[0040] Please see attached figure 1 , 3, slightly modified on the basis of Example 2, the amplitude of the pulsating shear field will be changed to 0.20mm, the frequency is 15Hz, and the extruded foamed product is still cooled by cooling water to shape the finished product.

[0041] Determination of the technical parameters of the extruded product is that the expansion ratio of the foam material is 8 times, and the foam bulk density is 114Kg / m 3 , the number average cell size can be adjusted at around 95 μm.

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Abstract

The invention relates to a foam polypropylene material in a pulsating shear force field and a preparation method thereof. With the weight of matrix polypropylene resin of high melt strength as 100 portions, other materials in raw materials are added according to the weight percentage of the matrix resin: 0.1-10.0 weight percent of organic chemical foaming agent, 0.1-1.0 weight percent of foaming additive, 0.1-1.5 weight percent of nucleating agent, and 0.1-0.5 weight percent of liquid processing additive. According to the preparation method, the materials are mixed separately in two steps, the uniformly-mixed materials are fed into a screw extruder, continuous extrusion is carried out for foam forming under the conditions that the temperature of the feeding section of a material cylinder is 145-170 DEG C, the temperature of a screw processing area is 180-215 DEG C, the temperature of a die head area is 155-170 DEG C, the screw speed is 6-80 rounds per minute, the amplitude of the pulsating shear force field is 0.01-1.00mm and the frequency is 1-60Hz, and the corresponding foam product can be prepared. The invention has the advantages that: the foaming ratio of the foam material is2-30 times, the density of the foam material is 50-500kg / m<3>, and the foam hole size can be adjusted to be between 10mum and 300mum.

Description

【Technical field】 [0001] The invention relates to the technical field of polypropylene materials, in particular to a foamed polypropylene material under the action of a pulsating shear force field and a preparation method thereof. 【Background technique】 [0002] Compared with polystyrene (PS), polyurethane (PP), polyethylene (PE) and EVA foam materials, polypropylene (PP) foam materials have more outstanding comprehensive properties, such as excellent heat resistance and mechanical properties. And good environmental adaptability and other advantages, making expanded polypropylene materials more and more widely used in food packaging materials, building materials, automotive materials, sports equipment, chemical materials, etc. The advantages of polypropylene foam materials are related to the microstructure of the material itself, that is, the shape and size of the cells of the foam material product determine the final use range and occasion of the material. Since ordinary p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08J9/06C08J9/10B29C44/60
Inventor 公维光朱成郑柏存林珩易红玲魏婷武易明孟圆圆
Owner EAST CHINA UNIV OF SCI & TECH