High-foaming-ratio polypropylene foaming material and preparation method thereof

A foaming material and polypropylene technology, which is applied in the field of high foaming ratio polypropylene foaming materials and their preparation, can solve the problems of easy shrinkage and collapse of foamed materials, difficult growth of cells, low foaming ratio, etc. The effect of delicate, smooth surface and high foaming ratio

Active Publication Date: 2020-07-03
宁波致微新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing foaming material cells are not easy to grow up, the expansion ratio is low, and the foaming material is easy to shrink and collapse when the supercritical gas foaming method is used to prepare the polypropylene foaming material. Problem, a polypropylene foam material with high expansion ratio is provided, and correspondingly, a preparation method for the polypropylene foam material is also provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] The steps of a preparation method of the above-mentioned polypropylene foam material are: (1) blending and extruding the components of the polypropylene composition into a billet with a screw extruder; (2) placing the billet in a high-pressure container for saturation Treatment, by filling the container with supercritical carbon dioxide to saturation pressure and heating to saturation temperature, the temperature of saturation treatment is 150-165 ° C, the pressure of saturation treatment is 5-30 MPa, the treatment at saturation temperature and saturation pressure The time ranges from 10 to 600 min; (3) Unpressurize the high-pressure vessel to obtain a foaming material.

[0041] Concrete examples and comparative examples are as follows.

Embodiment 11

[0044] Example 1.1: Take 100 parts of the first polypropylene with a melting index of 1.5g / 10min and a melting point of 154°C, and 10 parts of the second polypropylene with a melting index of 2.0g / 10min and a melting point of 164°C. The temperature is 155° C., the saturation treatment is 3 hours, and the pressure release time is 2 seconds to obtain a foamed material. The expansion ratio is 30 times, and the surface of the material is not melted. After 1 day, the material shrinks. The measured density is 25 times, and the compressive strength is 149KPa.

Embodiment 12

[0045] Example 1.2: On the basis of Example 1.1, after adding 1 part of nano-montmorillonite, foaming was carried out at 155 ° C and a pressure of 12 MPa, the saturation treatment time was 20 minutes, the expansion ratio was 30 times, no shrinkage after 1 day, and the compressive strength 95KPa.

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Abstract

The invention relates to the technical field of polypropylene foam materials, in particular to a high-foaming-ratio polypropylene foam material and a preparation method thereof. The polypropylene foaming material is prepared from a polypropylene composition through foaming, the polypropylene composition comprises first polypropylene, second polypropylene and a nano material additive, the melt index interval of the second polypropylene and the melt index interval of the first polypropylene are both 0.5-4 g/min, and the conditions are 190 DEG C and 2.16 kg. The second polypropylene has a highermelting point than that of the first polypropylene. On the premise that the high foaming ratio is guaranteed and foaming shrinkage can be inhibited as much as possible, it is guaranteed that a productmade of the foaming material has good notches and other appearance parameters, and it can be guaranteed that the product is exquisite in appearance and smooth in surface.

Description

technical field [0001] The invention relates to the technical field of polypropylene foaming materials, in particular to a polypropylene foaming material with high expansion ratio and a preparation method thereof. Background technique [0002] Polymer microcellular foamed material is a material with superior performance, exhibiting good mechanical properties, thermal properties and processability. Based on the advantages of polymer microcellular foaming materials such as light weight, heat insulation, sound insulation, cushioning, high specific strength, and low price, it is widely used in packaging, industry, agriculture, transportation, military industry, aerospace industry and daily necessities, etc. fields are widely used. At present, the traditional commonly used polymer microcellular foam materials include expanded polystyrene (PS), expanded polyethylene (PE) and expanded polyurethane (PU). There are isocyanate residues that are harmful to the human body during the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K3/34C08K3/04C08J9/12
CPCC08J9/122C08J9/0061C08J9/0066C08J2203/06C08J2203/08C08J2323/12C08J2423/12
Inventor 闫海阔周武舜
Owner 宁波致微新材料科技有限公司
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