A kind of microporous pc/abs alloy and preparation method thereof

A microporous and alloy technology, applied in the field of microporous PC/ABS alloy and its preparation, can solve the problems of restricting the industrial production output of microporous plastics, reducing injection pressure, reducing internal stress, etc., so as to shorten the injection molding cycle and reduce mold clamping. force, the effect of reducing burrs and internal stress

Inactive Publication Date: 2016-01-27
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The batch molding method is the earliest used in microcellular foam molding technology, but its obvious disadvantages are low efficiency and low output, which limit the application of this technology in industrial production
The continuous extrusion of microporous plastics requires less and simple equipment, but the rapid decompression die requires a large aspect ratio, which limits the industrial production of microporous plastics
The injection molding method is to form bubble nuclei through rapid heating. This process is better controlled, and injection molding also has the functions of eliminating product sag, reducing size shrinkage, reducing internal stress, reducing deformation, reducing injection pressure, and reducing clamping force. Energy-saving and other advantages, so this molding method is the main molding method of microcellular foam plastics at present. It can process a variety of polymers, such as PP, PS, PBT engineering plastics, PA and PEEK, but it is still less used for PC / ABS alloys.

Method used

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  • A kind of microporous pc/abs alloy and preparation method thereof
  • A kind of microporous pc/abs alloy and preparation method thereof
  • A kind of microporous pc/abs alloy and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0023] A preparation method of microporous PC / ABS alloy, comprising the following steps:

[0024] (a) Dry the PC / ABS alloy raw material at a temperature of 80-110°C for 3-5 hours;

[0025] (b) Add the dried raw materials in step (a) into the barrel of the injection molding machine and enter the barrel, and melt the raw materials through heating and stirring of the screw; at the same time, the supercritical fluid used as a foaming agent is prepared by a supercritical fluid constant pressure supply device. Nitrogen is transported and metered by a supercritical fluid delivery device, and the gas is injected for 6-12 seconds, and the supercritical nitrogen is injected into the barrel to form a gas / polymer mixture;

[0026] (c) The gas / polymer mixture obtained in step (b) forms a gas / polymer homogeneous system under the action of stirring and shearing of the screw of the injection molding machine, and is rapidly heated to 200-300°C to make the homogeneous The system produces great...

Embodiment 1

[0030] Example 1 : adopt the above-mentioned supercritical fluid injection molding system, prepare according to the following steps:

[0031] (a) Dry the PC / ABS alloy raw material at a temperature of about 100°C for 3 to 5 hours;

[0032] (b) Put the dried raw materials in step (a) into the barrel of the injection molding machine and enter the barrel, and melt the raw materials through heating and stirring of the screw; the pre-plastic volume is 20 mm; The critical nitrogen is transported and measured by the supercritical fluid delivery device, and the gas is injected for 7s, and an appropriate amount of supercritical nitrogen is injected into the barrel to form a gas / polymer mixture;

[0033] (c) The gas / polymer mixture obtained in step (b) forms a gas / polymer homogeneous system under the action of stirring and shearing of the screw of the injection molding machine, and the homogeneous system is generated by rapid heating to 250°C Great thermal instability, so that the gas...

Embodiment 2

[0035] Example 2 : adopt the above-mentioned supercritical fluid injection molding system, prepare according to the following steps:

[0036] (a) Dry the PC / ABS alloy raw material at a temperature of about 90°C for 4 hours;

[0037] (b) Put the dried raw materials in step (a) into the barrel of the injection molding machine and enter the barrel, and melt the raw materials through heating and stirring of the screw; the pre-plastic volume is 16mm; The critical nitrogen is transported and measured by the supercritical fluid delivery device, and the gas is injected for 9s, and an appropriate amount of supercritical nitrogen is injected into the barrel to form a gas / polymer mixture;

[0038] (c) The gas / polymer mixture obtained in step (b) forms a gas / polymer homogeneous system under the action of stirring and shearing of the screw of the injection molding machine, and is rapidly heated to 280°C to generate a homogeneous system Great thermal instability, so that the gas is preci...

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Abstract

The invention relates to a microporous PC / ABS alloy and a preparation method thereof. The average micropore diameter of the microporous PC / ABS alloy is less than 1 μm, and the number of cells is greater than 109 / cm3; Reduced by more than 10%, the impact strength increased by about 2 times. The preparation method uses supercritical nitrogen as a foaming agent and injection molding to obtain a microporous PC / ABS alloy with small cell diameter, high density and uniform distribution; supercritical nitrogen foaming is combined with injection molding methods, supercritical nitrogen It can reduce the viscosity of the resin, reduce the clamping force in injection molding, reduce the burrs and internal stress of the product, prolong the life of the mold, and increase the dimensional stability of the product; it can also reduce the defects such as warpage and shrinkage marks of the product, and improve product quality. In addition, because the pressure-holding stage in traditional injection molding is not required, the injection molding cycle is shortened, the production efficiency is improved, and the cost is reduced.

Description

technical field [0001] The invention relates to a microporous PC / ABS alloy and a preparation method thereof. Background technique [0002] Microcellular plastic (microcellular plastic) refers to a cell diameter of 0.1-10 μm and a cell density of 10 9 -10 15 piece / cm 3 , uniformly distributed closed-cell structural foam. Microcellular foam contains a large number of tiny bubbles whose size is smaller than the defects of the polymer itself, so that it not only has the advantages of light weight, material saving, heat insulation, sound insulation, and shock load absorption in general foam plastics, but also has the advantages of reducing stress concentration and weakening Material processing factors affect and improve the mechanical properties of products. In general, microcellular foam has the advantages of high impact strength, high toughness, high specific stiffness, high fatigue life, low dielectric constant, low thermal conductivity, and better energy absorption, so mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C69/02B29C45/47B29C44/02
Inventor 林有希林云卢月美林正英罗特韩云侯万里
Owner FUZHOU UNIV
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