Moulded bodies comprising of humus-containing plant substrate co

Details Moulded bodies comprising of humus-containing plant substrate co Moulded bodies comprising of humus-containing plant substrate co

1998-05-22

2000-03-07

Fox, David T.

Plant husbandry

Process

47 655, 47 657, 521 15, 524 3, A01G 3102, A01B 7900, A01C 100, C08K 300

Patent

active

060324120

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to moulded bodies for the propagation and raising of plant seedlings, wherein the moulded body consists of a humus-containing plant substrate consolidated with polyurethane/polyurea. The invention also relates to a process for producing moulded bodies of this type and to their use as nutrient media in the propagation and raising of plants.
Plant propagation (sowing of seeds and propagation of cuttings) and the raising of plants (continued cultivation of plants which have developed into seedlings) are traditionally carried out in plant soils which usually consist, depending on the type of plants, of mixtures of peat, sand, garden soil and composts, moss- and bark-based soils, or so-called ready-to-use soils to which granular plastics are often added as auxiliary agents for breaking up the soil. In commercial nurseries, moulded bodies which consist of plant substrates consolidated with polyurethane plastics are used for the propagation and raising of plants. These substrate bodies contain the plant seedling and can be pricked out or cut with the plant during propagation, or the seedlings can be cultivated directly on moulded bodies which have been cut previously. Moulded bodies comprising peat and nutrients and which have been consolidated by means of a polyurethane are already known from DE-OS 1 949 462. Production installations are known from DE 3 829 256 in which a peat-water mixture is mixed, batch-wise or continuously, with a hydrophilic polyurethane prepolymer and is shaped in a mould, with curing of the plastic, to form corresponding moulded bodies or so-called peat plugs. The polyurethane polymers which are currently used to produce the moulded bodies employed in plant cultivation still have some disadvantages in this field of application, such as natural variations in the composition of the substrate,
The object of the present invention was therefore to find a polyurethane plastic with which moulded bodies containing a plant substrate for the propagation and raising of plants could be produced without the aforementioned disadvantages.
It has now been found that moulded bodies which a contain plant substrate and which are consolidated with a polyurethane plastic can be produced without the said disadvantages if prepolymers from the reaction of toluene diisocyanate (hereinafter called TDI) with a polyol component containing at least one aminopolyether polyol are used for consolidating the moulded bodies.


SUMMARY OF THE INVENTION

The present invention thus relates to moulded bodies comprising a humus-containing plant substrate consolidated with polyurethane/polyurea, which are obtained by weight, produced by the reaction of TDI with a polyether polyol component containing at least one aminopolyether polyol in an amount of 0.5 to 100 mole % with respect to the polyether polyol component, and solidify.
The moulded bodies according to the invention may contain all the plant substrates which are customary in plant cultivation, such as peat, sand/soil mixtures, potting compost, sewage sludge, compost or granular bark materials, and preferably contain peat, potting compost, sewage sludge and/or compost.
The moulded bodies according to the invention preferably contain the NCO prepolymer in an amount of 5 to 20% by weight with respect to the humus-containing plant substrate.
The polyether polyol component should preferably have a functionality of 2 to 6, an average molecular weight in the range from 250 to 12,000, particularly from 350 to 6000.
The polyether polyol component always contains at least one polyether which contains an amino-group. This is understood to mean a polyether which is started on an aminoalcohol or on a polyamine (e.g. on triethanolamine or ethylenediamine).
The polyether polyol component may contain aminopolyethers which comprise propyleneoxy or ethyleneoxy groups, and which are started on triethanolamine or ethylenediamine, for example.
Apart from one aminopolyether polyol, a plurality of aminopolyether polyols may also of course be pres

REFERENCES:
patent: 3805532 (1974-04-01), Kistner
patent: 4034508 (1977-07-01), Dedolph
patent: 4045527 (1977-08-01), Babayan et al.
patent: 4609685 (1986-09-01), Cuscurida et al.

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