DD144885A1 - METHOD FOR PRODUCING SHAPED PARTS FROM POLYURETHANE DEVICES - Google Patents

Abstract

The invention relates to a process for the preparation of Moldings, preferably plates and coverings, predominantly highly cross-linked, unplasticized, shredded polyurethane waste, with solutions of rubber compounds in suitable solvents or with rubber for further processing into rubber compounds or with rubber compounds already vulcanizable mixed and on conventional processing units under the usual procedures and conditions for rubber processing be shaped and vulcanized. The produced by this method Moldings are characterized by the fact that the characteristic Properties of the polyurethanes used, e.g. Elasticity, Softness and flexibility, especially at low temperatures and the media resistance remain largely intact. The Moldings can 'to improve the surface quality or the color design on one or both sides with rubber plaques, textile, metallic, high polymers or other materials existing cover layers during the manufacturing process the moldings or subsequently be occupied.

Description

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Title of the invention

Process for the production of standard parts from polyurethane waste

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The invention relates to an ancestor for the production of molded articles from polyurethane waste in admixture with additives by known Verarboitungsvorfahren.

Characteristic of the known technical solutions

The processing of polyurethane produces waste whose recycling is already known for a number of possibilities

theriaische plasticization OCE wastes at temperatures in the range 120-190 ⁰ C and their sole or joint processing with various additives, such as high polymeric materials, polyurethane precursors, and inorganic substances. This possibility is ZoB. in DD-PS 103106 and DT-OS 2615840 described.

It is also known that crushed wastes mixed high polymeric materials with curable synthetic resins or synthetic resin dispersions as well as polyurethane and are then further processed to form plates or pads, as is described, for example _c in DT-OS 2447174 "The known methods of thermal plasticization of However, polyurethane wastes and subsequent further processing in the thermoplastic state have the defect that waste with a high degree of crosslinking can not be reprocessed in this way. The utilization of highly crosslinked polyurethane waste to plates and coverings with the use of binders on synthetic resin or »plastic dispersion base is possible, but has the defect that interesting for many applications rubber-like properties of the polyurethane, such as _e elasticity, softness and flexibility especially at low temperatures, or severely impaired.

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The aim of the invention is to supply the polyurethane waste an economically interesting use that can not be recycled by the previously known methods. In particular, predominantly highly crosslinked polyurethane waste without prior thermal plasticization and subsequent further processing in the thermoplastic state should be combined with suitable additives in such a way that

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from which it is possible to produce plates, coverings or other shaped articles which have good elasticity, softness, flexibility and swelling resistance to organic, predominantly aliphatic solvents compared to previously known combinations.

the essence of the invention

Dor invention has for its object to develop a method for the production of molded parts of polyurethane waste in admixture with additives, wherein the above requirements are met. The object is achieved in that the polyurethane waste mechanically crushed on conventional machines and then premixed with solutions of rubber mixtures in suitable solvents and formed after evaporation of the Lösungsmittel''in conventional units to moldings, mainly to plates and coverings and vulcanized »The moldings For the purpose of improving the surface quality or the color design, rubber or textile plates, metallic, high polymer or other cover layers may be used on the one or both sides during the manufacturing process of the molded parts.

The object is further achieved in that finely ground polyurethane waste are mixed on conventional Mischaggregateη with rubber and then further processed into vulcanizable rubber mixtures or that finely ground polyurethane waste is incorporated directly into vulcanizable adjusted rubber mixtures willηβ These mixtures are conventional on processing units under the usual for rubber processing Method and conditions are molded and vulcanized »Dia for the solution according to the invention

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mixtures are composed as follows!

Elastomers, for example:

NE, SBR, HBE, BR, IIR, IR, CR, CSM, EPDM,

EPM, Q? or combinations of these types

Mineral fillers and / or carbon blacks

100 parts by weight

0 - 400 parts by weight "referred to 100

Parts by weight of elastomer

Aromatic, naphthenic or ρaräffinischö plasticizers or mixtures thereof

from 0~100 parts by weight based on 100 parts by weight of elastomer

Organic vulcanization accelerators

0-5 Gen.

parts by weight based on 100 parts by weight of elastomer

Vulcanizing agents such as sulfur peroxides metal oxides resins

from 0 - 25 parts by weight based on 100 gawichtstsila elastomers

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For the preparation of the described rubber solutions Guinmiiaischungen the above composition in the order of 5-60 percent by weight dissolved in aliphatic odor aromatic solvents, in chlorinated hydrocarbons, in esters odor ketones or in mixtures of the solvents. The orfindungsgemäß prepared moldings, mainly Plat tone, which are obtained by mixing crushed polyurethane waste with solutions of Gummimischunson, are characterized in that the characteristic properties of polyurethanes, such as ζ. Elasticity and softness and flexibility, especially at low temperatures, as well as media responsibility, remain intact.

The mixture of ground polyurethane waste with rubber or rubber mixture according to the invention is characterized in that the elasticity properties of Vulkanisato are not so much reduced compared to the use of analogous amounts of mineral fillers or carbon blacks and the hardness is not increased so much. Particularly in combination with media-resistant elastomers, such as, for example, HBR odor GPl, there are technically and economically interesting combination possibilities, since the resistance of these vulcanizates to certain media can even be further disturbed by this.

The invention will be explained in more detail in Ausführungsbeispiolen.

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example 1

The following rubber compounds (I and II) were I Condensation resin from Formalde 2.58 prepares: parts by weight hyd and alkylphenol 1:55 II resorcinol 1.03 parts by weight Acrylonitrile-butadiene- 51.63 stearic acid 5.16 Rubber with 27% acrylonitrile Zinc oxide WS - - Styrene ~ Butadien-Kautsch.uk - titanium white 7.75 with 27% styrene 0.77 dibutyl phthalate 15,48 52.42 Phenyl-beta-naphthylamine Silica iTüllstoff - Isopropylphenyl-p ~ phenylene ~ 0.77 chalk 10.33 diamine Acetylene thermal black - Benzothiazyl-N-cyclohexyl- 0.26 sulfenamide 1.81 2.62 hexamethylenetetramine - - 2-mercaptobenzothiazole 0.88 1.05 sulfur 400.00 5.24 trichlorethylene 500.00 2.62 7.86 20.96 5.24 - 0.63 -. 0.21 1.15 400.00 500.00

The shredded polyurethane wastes with particle sizes between 0.5 and 10 mm in diameter were wetted well with the rubber solutions I or II and then the solvent was evaporated off »

The mixed with a mixture layer polyurethane crumb were in a Vulkanisierpresse 30 min _e at 150 ⁰ G.

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vulcanised to 10 mm thick plates.

The following properties were determined on these plates:

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tensile strength MPa 4.6 4.8 elongation % 135 125 impact resilience % 37 35 Hardness "Shore A" 70 65

In contrast, prior art comparative samples made with a thermoplastic binder had a 15% impact resilience of 95 Shore Α hardness.

Example 2

Finely ground polyurethane waste with a grain size of 0.1 1 mm in diameter of the stated order of magnitude was mixed into the following rubber mixture,

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(without polyurethane) (with polyurethane)

Parts by weight parts by weight of acrylonitrile butadiene rubber

Chuk with 27% acrylonitrile 100.00 1.00 100.00 -8th- Polyure than regrind - 0.10 50,00 (Grain diameter 0.1 - 1 mm) 1i70 Phenyl-beta-naphthylamine 1.50 184.30 1.50 Zinc oxide active 5.00 5.00 dibutyl phthalate 15.00 15.00 HAF 30.00 30.00 chalk 10.00 10.00 kaolin 20.00 20.00 Benzothiazyl-H-cyclohexyl- sulfenamide 1.00 Tetrsmethyltaiuramdisulfid 0.10 sulfur 1.70 234.30

... 214 355

The mixtures were in a Vulkanisierpresse 20 min. at 150 ⁰ C to 4 now strong PIj property image showed *

150 ⁰ C vulcanized to 4 now strong plates, the following

Tensile strength LIPa Elongation at break % modulus at 300 % elongation

Impact resilience Hardness "Shore A" Weight swelling (after 72 hours in isooctane / toluene = 7O / 3O)

III IV 9.2 9.0 360 380 6.9 6.8 42 ' 39 59 64 22 17

Claims (3)

-9- 8-1 i $ ss invention claim 1. A process for the production of moldings, preferably plates and coverings, from Polyurethanabfalleη in admixture with additives, characterized in that used for the mixture predominantly highly cross-linked, unplasticized, crushed polyurethane waste and solutions of rubber mixtures and molded after evaporation of the solvent in a conventional manner and vulcanized or the polyurethane wastes are ground, mixed with rubber and processed into vulcanizable rubber compounds or "incorporated directly into vulcanized rubber compounds" 2, method according to item 1, characterized in that in the process of shaping and crosslinking by simultaneous one or two-sided lamination of rubber compounds or textlien, metallic, high polymer or other materials existing outer layers, a surface remuneration, 3 · Method according to item 1, characterized in that the molded and crosslinked panels are coated on one or both sides by subsequent lamination of polymeric, textile, metallic or other materials of existing covering layers,