DD298251A5 - MICROBORENT RESISTANT POLYURETHANE ELASTOMERS - Google Patents

Abstract

The invention relates to microembristically endowed polyurethane elastomers and relates to polyurethane elastomer molded parts which can be produced both by thermoplastic processing methods and by the reaction casting technique and are stabilized against microbial attack, in particular mold infestation. They are used where reinforced requirements on polyurethanes, especially mold fungus resistance are provided, such. As for technical moldings in agricultural machinery and equipment, devices and machinery in boat and shipbuilding and located in Erdberuehrung electrical equipment. According to the invention, the polyurethane elastomer contains 0.2 to 2.0 parts by mass of a compound of the general formula type as a fungicidal active ingredient, wherein {polyurethane elastomers, microbe-resistant, anti-fungal; Fungicide; technical moldings; electrotechnical equipment parts}

Description

Ro: H,GJL ₁₇ -G-Alkyl, -C-aryl or ^{5 x}* Hj

O O

-G heteroatoms

Il ö

2. Microbe resistant finished polyurethane isomers according to claim 1, characterized in that the fungicidal active ingredient is introduced before or during the synthesis by addition to the reaction component of the polyurethane as well as thermoplastically processable polyurethane elastomers prior to the shaping processing process in the polyurethane granules.

3. microbe resistant polyurethane elastomers according to claim 1 and 2, characterized in that the fungicidal active ingredient can be incorporated as a concentrate in granular form.

Field of application of the invention

The invention is applicable against microbial attack, in particular mold infestation, stabilized polyurethane elastomer moldings and semi-finished products which can be produced both by thermoplastic processing methods and by the reaction casting technique. Their use takes place primarily where the polyurethane application case reinforced requirements in terms of microbenzene resistance, in particular mold fungus resistance, are provided, such. As for technical moldings in agricultural machinery and equipment, devices and machinery in boat and shipbuilding and in contact with the ground electrical equipment parts.

Characteristic of the known state of the art

There are a number of compounds known that stabilize high polymer materials against microbial attack. For example, DOS 2931838 cites halogen-substituted phenol compounds which counteract microbial attack, thereby preventing degradation of the polymer body caused thereby.

However, this substance class is not suitable for the fungitoxic finish of polyurethane elastomers, since the phenolic hydroxyl group causes a termination of the polyurethane formation reaction and consequently causes a sharp drop in the physico-mechanical characteristics.

Furthermore, the use vorr heavy metal-containing inorganic and organic compounds is known, whose application in polyurethane systems, however, limits are set, since they adversely affect the kinetics of polyurethane synthesis and promote hydrolytic degradation processes in the polyurethane polymer due to their catalytic activity.

Also known is the use of zinc borate as a fungitoxic additive for the prevention of mold infestation, as described in DD-WP 208161. A disadvantage is the relatively low activity, so only degrees of growth of 2 are achieved according to TGL 22391. For applications where high inhibition requirements are required and growth rates below 1 or 0 are required, the use of zinc borate is not suitable.

Object of the invention

The aim of the invention is to equip conventional polyurethane elastomers with improved fungitoxic effectiveness, with good mechanical and physical end properties are to ensure and the occurrence of disturbing side effects such as discoloration and migration phenomena is excluded.

Explanation of the essence of the invention

The object of the invention is to develop polyurethane elastomer systems with improved microbial resistance, in particular other mold fungus resistance, while at the same time precluding a "good physical-mechanical characteristic level, disturbing side effects such as adverse effect on the polymer structure.

The object is achieved in that the polyurethane elastomer is a compound of the type of the general formula

2 '

^R 1

% By weight of CrN in an amount of 0.2 to 2.0% by weight as fungicidal active ingredient, wherein

R ₁ , R ₂ : H ₁ halogens or NO ₂ and

Ro: H, CJL,. - C - alkyl, - C - aryl or - C - hetero-3 ^χ ϊ 'H. 8 ^atoms

The introduction of said compounds can be carried out as an active ingredient concentrate, preferably as a granular form, before or during the substrates by addition to the reaction components of the polyurethane as well as thermoplastically processable polyurethane elastomers prior to the forming process to the polyurethane granules.

In addition to the addition of the listed fungicidal stabilizing agents, further stabilizing additives such as UV and hydrolysis protective substances and processing aids may be included in an analogous manner.

The polyurethane elastomers are known to be composed of long-chain polyhydroxy compounds, short-chain diols, short-chain triols, diisocyanate depending on the application, and auxiliaries such as stabilizers, lubricants, color pigments and catalysts. The polyaddition reaction is carried out according to the requirement of the one- or two-step process.

The moldings and semi-finished products prepared by addition of the fungicidal material according to the invention by injection molding or extrusion or by hand casting have, after testing with molds according to known test methods using additional mold types and the aerosol inoculation process, the growth stage 0, i.e., no fungal growth is detectable. Conventional, unstabilized polyurethane elastomers are not stable under the same conditions and are destroyed by the fungal attack.

embodiments

Example 1 (comparative example)

A mixture of 100 parts by weight of a polyester alcohol consisting of adipic acid, 1,4-butanediol and ethanediol, having an average molar mass of 2000.9.2 parts by weight of 1,4-butanediol as a chain extender, 1.7 parts by weight of N, N'-diphenyl - (2,2 ', 6,6'-tetraisopropyl) carbodiimide as a hydrolysis and 0.3 parts by weight of paraffin oil is heated to 8O ⁰ C and after about 1 minute homogenization with 40.5 parts by mass of 4,4'-diphenylmethane diisocyanate, which was brought to a temperature of 6O ⁰ C, added. The reaction mixture is poured after about 1 minute intensive mixing on a heated plate of 130 ⁰ C. After solidification of the reaction mixture and deposition for 24 hours at room temperature, the granulation of the polyurethane elastomer takes place. The finished granules are then processed by means of injection molding to test specimens, which have the following physical mechanical characteristics:

Hardness (Shore A): 81

Tensile strength (MPa): 38

Elongation at break (%): 683

Abrasion: (mm ³ ): 43

Tear resistance (N / cm): 552

The specimens were subjected to the TGL 22931 mold fungus test method A and B using TGL 9208 supplemental fungal fungi and the aerosol inoculation process. After 24 days of storage under the described test conditions, a dense mycelium spun on the entire test specimen surface was formed. The action of the Schirnmelpilzbewuchses also led to cracking on the surface and inside the specimen and as a result, to reduce the tensile strength of the material up to 30%. The polyurethane elastomer is not suitable for use under mold fungus conditions.

Example 2

To the polyurethane elastomer prepared according to Example 1, in the polyester alcohol component, based on mass fractions of the polyester alcohol, 0.66 parts by mass of the compound

added. The synthesis and the further treatment of the polyurethane elastomer then obtained are carried out analogously to Example The test specimens obtained have the following physical-mechanical characteristics:

Hardness (Shore A): 84

Tensile strength (MPa): 40

Elongation at break (%): 650

Abrasion (mm ³ ): 48

Tearing resistance (N / cm): 610

By introducing the fungicidal compound according to the invention, neither an impairment of the level of the mechanical characteristics nor a negative influence on the molded part with regard to surface quality and color can be fixed.

The test specimens were subjected to the mold fungus test analogously to Example 1. It was determined the fouling level 0, d. h., there was no mold infestation under these conditions.

The polyurethane elastomer is suitable for use as a material where mold infestation is to be expected.

Example 3

To the polyurethane elastomer granules prepared according to Example 1 are 2 parts by weight of a 50% active ingredient concentrate in granule form based on the compound prior to injection molding

Cl.

homogeneously mixed. The specimens obtained after injection molding were subjected to a mold test according to Example 1. The test resulted in the growth stage 0 analogous to Example 2. A material suitability under mold infestation conditions is given thereafter.

Example 4

In a prepared according to Example 1 polyurethane elastomer granules before the thermoplastic molding mass fractions of a 25% active ingredient concentrate in Gianulatform on the basis of the compound

NO ₂

homogeneously mixed. The test specimens obtained by injection molding gave the following physico-mechanical characteristics with good optical quality:

Hardness (Shore A): 81

Tensile strength (MPa): 35

Elongation at break (%): 650

Abrasion (mm ³ ): 24

Tear resistance (N / cm): 559

As a result, the mold fungus resistance test as in Example 1 gave growth stage 0, i. it was a strong fungicidal effect detectable.

Belsplel5

To a manufactured according to Example 1 polyurethane elastomer granules are before processing by injection molding 2 parts by weight of a 50% active ingredient concentrate based on the compound

homogeneously mixed. The evaluation of the test pieces produced by injection molding resulted in a deterioration in their optical quality and their physico-mechanical properties. The examination of the mold fungus resistance analogous to Example 1 yielded the growth stage 0, d. H. a strong fungicidal activity.

Examples

A polyurethane elastomer granule synthesized according to Example 1 is preceded by 2 mass fractions of a 50% active ingredient concentrate based on the compound prior to injection molding

CKL - C - O <<= >

NO ₂

homogeneously mixed. The assessment of the test specimens produced by injection molding gave neither an impairment in terms of their optical quality nor their physico-mechanical characteristics.

The examination of the mold fungus resistance according to Example 1 gave a strong fungicidal action with the growth stage 0.

Claims (1)

1. Microbe resistant polyurethane elastomers, characterized in that the polyurethane elastomer is 0.2 to 2.0 parts by mass of a compound of the type of the general formula R ₁ CSN
as a fungicidal active ingredient, wherein R ₁ , R ₂ : H, .. ilogene or NO ₂ and