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Bead polymer for producing PMI foams

A polymer and foam molding technology, applied in the field of foamable bead polymers, can solve the problems of unsuitable suspension polymers

Inactive Publication Date: 2015-10-21
EVONIK ROEHM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this involves a completely different technical field, and the teaching of JP2005-364784 is not suitable for providing suspended polymers for the preparation of PMI foam workpieces

Method used

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  • Bead polymer for producing PMI foams

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Aqueous phase: 500.0 g water, 120.0 g sodium sulfate and 7.4 g Degapas 8105S; Mw: 580 000 g / mol; 13.5% strength aqueous solution

[0051] Degapas 8105S is obtained from Polyacrylic acid from Chemiewerke

[0052] Organic phase: 114 g methacrylic acid, 76 g methacrylonitrile, 10 g tert-butyl methacrylate, 0.9 g AIBN, 0.9 g dilauroyl peroxide, 0.2 g tert-butyl per-2-ethylhexanoate

[0053] Water was preliminarily placed in a 1 liter Schmizo reactor with ceramic paddle stirrer, cooler and thermocouple and sodium sulfate was dissolved therein at room temperature. The solution was heated to 75° C. and added dropwise to the monomer phase (solution of monomer and initiator) under stirring (170 rpm) within 35 minutes. The mixture was then stirred at this temperature for a further 1.5 hours. The dispersant was then added dropwise over 2 minutes. An exothermic reaction could be noticed 4 hours after the start of the reaction. The mixture was then stirred at 90 °C for an addi...

Embodiment 2

[0055] Aqueous phase: 706.50 grams of water, 176.47 grams of sodium sulfate, 42.52 grams of Degapas 8105S, 13.5% aqueous solution

[0056] Organic phase: 159.26 g methacrylic acid, 120.14 g methacrylonitrile, 14.70 g tert-butyl methacrylate, 1.28 g AIBN, 1.28 g dilauroyl peroxide, 0.29 g tert-butyl per-2-ethylhexanoate

[0057] Water was preliminarily placed in a 1 liter Schmizo reactor with ceramic paddle stirrer, cooler and thermocouple and sodium sulfate was dissolved therein (internal temperature approximately 75° C.). The ambient air in the reactor was replaced by means of dry ice. The stirring speed was 170 rpm. The organic phase was then added dropwise over 30 minutes. After a reaction time of 2 hours at an internal temperature of about 77°C, the dispersant was added. A slightly exothermic reaction was observed 4 hours after the start of the reaction. The mixed batch was stirred for 1 hour at an internal temperature of 89.5°C. Remove thermocouple. After a post rea...

Embodiment 3

[0060] Example 3: Monomer Mixture Containing Allyl Methacrylate as Crosslinker

[0061] Aqueous phase: 706.50 grams of water, 176.47 grams of sodium sulfate, 42.52 grams of Degapas 8105S; 13.5% aqueous solution

[0062] Organic phase: 164.46 g methacrylic acid, 124.23 g methacrylonitrile, 5.74 g t-butyl methacrylate, 0.294 g allyl methacrylate, 1.28 g AIBN, 1.28 g dilauroyl peroxide, 0.29 g per- tert-butyl 2-ethylhexanoate

[0063] Water was preliminarily placed in a 1 liter Schmizo reactor with ceramic paddle stirrer, cooler and thermocouple and sodium sulfate was dissolved therein (internal temperature approximately 75° C.). The ambient air in the reactor was replaced by means of dry ice. The stirring speed was 170 rpm. The organic phase was then added dropwise over 30 minutes. After a reaction time of 2 hours at an internal temperature of about 77°C, the dispersant was added. After a reaction time of 4 hours (exothermic reaction 79.9°C, bath temperature 79.2°C), the reac...

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Abstract

The invention relates to a foamable bead polymer consisting of (meth)acrylonitrile, (meth)acrylic acid, copolymerizable latent expanding agents and optionally (meth)acrylic acid esters, to the production of said polymer by means of suspension polymerization and to the use thereof for producing foams. Using a bead polymer of this type it is possible, for example, to carry out a simple in-mould foaming process to produce products directly in the form of the desired workpiece. These workpieces are particularly suitable for use as components in spacecraft, aircraft, water and land craft and for other construction elements.

Description

technical field [0001] The present invention relates to a foamable bead polymer consisting of (meth)acrylonitrile, (meth)acrylic acid, a copolymerizable latent blowing agent and optionally a (meth)acrylate ester, prepared by suspension polymerization and its use for the preparation of foams. The use of such bead polymers makes it possible, for example, to carry out in-mold foaming in a simple manner and thus to produce products directly in the shape of the desired workpiece. These workpieces are particularly suitable as components in aerospace, aviation, marine and land vehicles and for other construction elements. Background technique [0002] Poly(meth)acrylimide foams based on (meth)acrylic acid, (meth)acrylonitrile and optionally (meth)acrylates are distinguished by their high compressive strength and heat resistance. These foams are produced in a standardized manner by polymerization of the corresponding monomers in the presence of blowing agents in the form of cast p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/16C08J9/20C08L33/20C08F2/16C08F2/20C08F220/06C08F220/44C08F2/44C08J9/02C08J9/14
CPCC08F2/20C08F2/44C08J9/02C08J9/142C08J9/20C08J2201/04C08J2203/12C08J2203/14C08J2333/02C08J2333/20C08J2333/26C08L2203/14C08F220/06C08F220/44C08F220/1804C08F220/40C08J9/0023C08J2333/08
Inventor T·里奇特S·施沃茨-巴拉克K·伯恩哈德I·莱贝尔M·施纳贝尔S·施威特兹尔D·珀普J·沃尔霍尔兹
Owner EVONIK ROEHM GMBH
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