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Polypropylene foam material with bimodal distribution and preparation method thereof

A foamed material, bimodal distribution technology, applied in the field of polymer porous materials, can solve the problems of complex process, large limitations, low controllability, etc., and achieves low preparation cost, no damage to equipment, and good controllability. Effect

Active Publication Date: 2018-05-15
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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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 technical problems of the preparation method of the bimodal foaming material in the prior art, such as complex process, large limitations, and low controllability, and to provide a polypropylene foaming material with bimodal distribution and its preparation method

Method used

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  • Polypropylene foam material with bimodal distribution and preparation method thereof
  • Polypropylene foam material with bimodal distribution and preparation method thereof
  • Polypropylene foam material with bimodal distribution and preparation method thereof

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preparation example Construction

[0035] The above-mentioned preparation method of the polypropylene foam material with bimodal distribution, comprises the following steps:

[0036] Step 1. Composite porous inorganic particles and matrix resin to obtain a composite material. If the polypropylene foam material with bimodal distribution contains additives, after selecting the additives, add the additives, porous inorganic particles and matrix resin together Compounding, the matrix resin can also be replaced by the matrix resin modified by additives;

[0037]The composite material can be a sheet or a particle. In the composite material, the mass percentage of the porous inorganic particles is 0.05%-10%. When the mass percentage of the porous inorganic particles is less than 0.05%, the number of nucleation points is too small. % is not conducive to the dispersion of porous inorganic particles, and is prone to agglomeration in the matrix resin; the mass percentage of additives is within 2%;

[0038] The compoundin...

Embodiment 1

[0055] First, isotactic polypropylene (Tm=167°C, MFR=3.3g / 10min), activated carbon powder (particle size 200nm, specific surface 1300m 2 / g, pore diameter 1.2nm, 3wt%) and antioxidant (B215, 0.2wt%) after melt extruding granulation in twin-screw extruder, make polypropylene sheet in flat vulcanizer; Propylene sheet, carbon dioxide and dispersant water whose volume is 5% of the volume of the autoclave are added into the autoclave for saturation, the saturation pressure is 15MPa, the saturation temperature is 160°C, the saturation time is 1h, and the pressure relief rate is 45MPa / s The pressure of the autoclave was released to obtain a polypropylene foam with a bimodal distribution.

[0056] The polypropylene foam material obtained in embodiment 1 is characterized by a scanning electron microscope, and the results are as follows: figure 1 As shown in b, it can be seen that the polypropylene foam material of Example 1 is a bimodal cell structure, and by comparing with Comparativ...

Embodiment 2

[0059] Atactic polypropylene (Tm=145°C, MFR=9g / 10min), A-type silica gel (particle size 38um, specific surface 600m 2 / g, pore size 2nm, 0.8wt%) and antioxidant (B215, 0.2wt%) melt extrusion granulation in twin-screw extruder, make polypropylene sheet in flat vulcanizer; Propylene sheet, carbon dioxide and 15% dispersant water of the volume of the autoclave are added into the autoclave for saturation. The saturation pressure is 4.5MPa, the saturation temperature is 153°C, and the saturation time is 1.5h. The pressure rate releases the pressure of the autoclave to obtain a polypropylene foam with a bimodal distribution.

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Abstract

The invention discloses a bimodal distribution type polypropylene foaming material and a preparing method thereof and belongs to the technical field of polymer porous materials. The technical problems of the prior art that a method for preparing a bimodal distribution type foaming material is complicated, limitation degree is high, and controllability is low are solved. The bimodal distribution type foaming material is mainly composed of porous inorganic particles and polypropylene resin, wherein the mass percent of the porous inorganic particles is 0.05-10%, particle size is 50 nanometers to 50 microns, specific surface area is 150<2> / g or above, and pore diameter is 0.3-20 nanometers. The relative density of the bimodal distribution type foaming material is 0.03-0.9 g / cm<3>, large pores with the average diameter of 15-50 microns and small pores with the average diameter of 1-10 microns are provided, and the ratio of the pore density of the large pores to the pore density of the small pores is 0.001-5:1. The bimodal distribution type foaming material has the advantages of being small in relative density and high in mechanical performance and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of polymer porous materials, and in particular relates to a polypropylene foam material with bimodal distribution and a preparation method thereof. Background technique [0002] Foam plastic is a kind of polymer material formed by a large number of gas micropores dispersed in solid plastic. It has the characteristics of light weight, heat insulation, sound absorption, shock absorption, etc., and its dielectric properties are better than that of matrix resin. It is widely used as heat insulation, Sound insulation, packaging materials and vehicle and ship shells, etc. [0003] Foam plastics can be divided into macroporous plastics and microporous plastics. The cell diameter of macroporous plastics is usually greater than 50 μm, the density is low, and the mechanical properties are poor, so they are mostly used for insulation and packaging materials. The cell diameter of microcellular plastics is usually betw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L53/00C08K7/24C08K7/26C08J9/12
CPCC08J9/122C08J2203/06C08J2323/12C08J2423/12C08K7/24C08K7/26C08K2201/003C08K2201/006C08L23/12C08L2203/14C08L2205/025C08L2205/24C08L2207/10C08L2207/14C08L53/00
Inventor 唐涛邱健王远亮邢海平姜治伟谭海英
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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