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Polycarbonate extrusion foaming composite sheet material and preparation method thereof

A polycarbonate and composite board technology, applied in the field of materials, can solve the problems of extrusion foaming, poor processing fluidity, and low melt strength, etc., and achieve the effects of weight reduction, low closed cell rate, and smooth surface

Active Publication Date: 2013-07-03
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as an amorphous material, PC has a high processing temperature, poor processing fluidity, high melt viscosity, and is prone to stress cracking. After melting, the melt strength is very low, and it is difficult to meet the needs of extrusion foaming.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Extrusion-grade PC with a melt index of 6g / 10min. The PC resin was pre-dried in a vacuum oven at 140°C for 4 hours; 30% of short alkali-free glass fibers were dried in an oven for 0.5 hours at a temperature of 110°C;

[0057](2) Preparation of modified PC pellets: take 51% of dried PC, 30% of short alkali-free glass fiber, 0.4% of chain extender bisoxazoline, and toughening agent of styrene-ethylene-butylene triblock copolymer SEBS10%, flame retardant triphenyl phosphate TPP6%, the second antioxidant is 0.3% of antioxidant 1076, the second antioxidant 168 is 0.3%, the second lubricant calcium stearate is 0.5%, the second Lubricant silicone powder 0.5% is put into a high mixer and mixed evenly, then put into a twin-screw granulator, the extrusion temperature is 260-275°C, and the screw speed is 50r / min;

[0058] (3) Remixing of pellets:

[0059] (3a) Mixing of core layer particles: Dry the PC modified material prepared in step (2) at 110°C for 4 hours; extruded PETG...

Embodiment 2

[0069] (1) Extrusion grade PC, melt index is 10g / 10min, PC resin is pre-dried in a vacuum oven at 140°C for 4 hours.

[0070] (2) Take the dried PC93%, the chain extender bisoxazoline 1%, the toughening agent MBS3%, the second antioxidant 1076 takes 0.2%, the second antioxidant 168 takes 0.2%, the second lubricant EBS0.2%, put it into a high mixer and mix it evenly, then put it into a twin-screw granulator, the extrusion temperature is 260-275°C, and the screw speed is 150r / min.

[0071] (3) Preparation of modified PC pellets:

[0072] (3a) Mixing of core layer particles: Dry the PC modified material prepared in step (2) at 110°C for 4 hours; extrude PETG with a melt index of 1.1g / 10min and dry it in a vacuum oven at 65°C ℃, dry for 5 to 6 hours, and confirm that the humidity is lower than 0.04%;

[0073] Put the dried polycarbonate modified pellets, and another 0.5% wetting agent white oil into the mixer and mix evenly, add THT1%, zinc stearate 0.9%, continue to mix evenly,...

Embodiment 3

[0082] (1) Extrusion grade PC, melt index is 9g / 10min, PC resin is pre-dried in vacuum oven at 140°C for 4 hours, take 10% of low-alkali short glass fiber and put it in the dryer for half an hour at 110°C ℃.

[0083] (2) Take 69% of dried PC, 0.7% of chain extender bisoxazoline, 10% of low-alkali short glass fiber, 3% of toughening agent SEBS, 15% of flame retardant DBDPO, and 0.3% of the second antioxidant 1076 0.3% of the second antioxidant 168, 0.2% of the second lubricant silicone powder, and 0.6% of the second lubricant calcium stearate were put into a high-mixer and mixed evenly and then put into a twin-screw granulator. The twin-screw processing temperature is 260-275°C, and the screw speed is 100r / min;

[0084] (3) Mixing of core particles:

[0085] (3a) Mixing of core layer particles: Dry the PC modified material prepared in step (2) at 100°C for 4 hours; extrusion grade PETG, melt index 1.1g / 10min, put it in a vacuum oven for drying, and the drying temperature is ...

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Abstract

The invention belongs to the technical field of materials, and relates to a polycarbonate extrusion foaming composite sheet material and a preparation method thereof. The sheet material is composed of a surface layer and a core layer, wherein the surface layer occupies 5%-20% of a whole thickness of the sheet material; the core layer occupies 80%-95% of the whole thickness of the sheet material; the surface layer is manufactured by the following components of, by weight, 99%-99.5% of poly(ethylene terephthalate)-1,4-dimethyl cyclohexane, 0.1-0.5% of a first lubricant and 0.1%-0.5% of a first antioxidant; and the core layer is manufactured by the following components of, by weight, 50%-95% of polycarbonate, 0-30% of a glass fiber, 0.1%-1% of foaming powder, 0.1%-1% of a foaming regulator, 0.1%-1% of a flame retardant, 3%-10% of a toughening agent, 0.1%-0.5% of a wetting agent, 0.2%-1% of a second lubricant and 0.5%-1% of a second antioxidant.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a polycarbonate extruded foam composite board and a preparation method thereof. Background technique [0002] In tunnels, buildings, bridges and other engineering constructions, a large number of building templates are required. At present, steel formwork, wood formwork, bamboo formwork and plastic foam formwork are mainly used. For example, more wooden formwork is used, which is of poor quality, wastes resources, and is difficult to recycle. However, foamed templates such as polypropylene / polyethylene have disadvantages such as low heat resistance temperature, easy brittle deformation, and poor mold release. The present invention uses polycarbonate (PC) as the main base material, polyethylene terephthalate-1,4-cyclohexane dimethyl (PETG) as the auxiliary base material, after being extruded, melted, foamed, cooled and shaped Applied to building templates, the heat-resistant te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/18C08L67/02C08L69/00C08K13/04C08K7/14C08K5/523C08K5/06C08K5/109C08K5/353C08K3/22C08J9/10B29C47/92B29C48/92
CPCB29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 郭建军
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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