摘要:
A fertilizer for the long term and uniform supply of plants with nutrient ions comprising a covalently crosslinked hydrogel in which are embedded ion exchangers which are laden with plant nutrients; furthermore a process for the long term and uniform supply of plants with nutrient ions wherein a covalently crosslinked hydrogel in which are embedded ion exchangers which are laden with plant nutrients is applied to the plants or their environment.
摘要:
This invention is directed to gels which are stable in storage, comprising a polymer matrix, a liquid dispersing agent embedded therein and optionally fillers or additives, characterized in that said polymer matrix is a polycondensation product of aldehydes and aminoplast-formers, at least 30% by weight of the aminoplast-formers having a molecular weight of between 200 and 10,000 and containing at least one ether, thioether, acetal, ester, urethane and/or carbonate group.
摘要:
In an insecticidal article comprising an insecticidally effective amount of at least one volatile phosphoric or thiophosphoric acid ester and a solid polyurethane carrier material, the improvement wherein said polyurethane is an elastomeric polyurethane, whereby the article retains its activity over a long period of time. The polyurethane is formed of a polyisocyanate and a mixture of a long chain polyol and a short chain polyol and/or polyamine.
摘要:
A process for supplying plants with nutrients uniformly and over a long period of time by the addition of nutrient-charged synthetic resin ion exchangers and mineral fertilizers to the culture medium, according to which the nutrient-charged synthetic resin ion exchangers are employed together with those mineral fertilizers with particle size
摘要:
A biologically active composition is prepared comprising a polyurethane hydrogel containing surface active coal, a polymer having cationic groups and cells having enzymatic activity and being capable of growth. The composition is used for purifying waste water and outgoing air.
摘要:
An aqueous preparations of a gel-like consistency, containing(A) 1-15% by weight of hydrophilic polyurethanes,(B) optionally up to 3% by weight of hydrophilic polymers which are water-soluble or capable of swelling in water, based on unsaturated monomers and/or modified cellulose derivatives,(C) optionally up to 2% by weight of surface active agents,(D) optionally up to 30% by weight of powder, and(E) 0.3-30% by weight of oil.The aqueous preparation is useful as a porosifying agent in the production of porous ceramic bodies.
摘要:
An aqueous preparations of a gel-like consistency, containing(a) oils in quantities of from 0.03 to 30% by weight,(b) water-soluble or swellable vinyl polymers in quantities of from 0.2 to 10% by weight,(c) water-soluble or swellable polymers based on natural substances in quantities of from 0.01 to 5% by weight,(d) surfactants in quantities of from 0.01 to 2% by weight and optionally(e) inorganic or organic powders in quantities of from 0.5 to 30% by weight.The aqueous preparation is useful as a porosifying agent in the production of porous ceramic bodies.
摘要:
The present disclosure is concerned with self-adhesive sheet-like structures made by adhering an adhesive polyurethane gel material to a supporting substrate and the utilization of such structures in the medical field to adhere materials such as plasters, wound dressings and appliances to the human body, and in other fields to connect articles, such as the parts of a fractured or cracked object, to one another by means of an adhesive bond. The gel is formed by immobilizing a high molecular weight polymeric polyol in the matrix of a covalently crosslinked polyurethane which is prepared by reacting polyisocyanates having an isocyanate functionality of at least 2 with higher molecular weight polyhydroxyl compounds having a hydroxyl functionality of at least 3. These reactants are selected in accordance with the following formula which relates the isocyanate number, K, (isocyanate to hydroxyl equivalents ratio times 100) to the average functionalities of the polyisocyanates (F.sub.I) and of the polyhydroxyl compounds (F.sub.P) as follows: ##EQU1## wherein X is less than or equal to 120. These reactants are also selected to give a weight ratio of matrix to immobilized polymeric polyol of between about 15:85 and 62:38.
摘要:
The present invention relates to a constructional material which is stable in storage and which is kept under moisture-free conditions and which comprises a substrate and a reactive one-component system which hardens on exposure to air by reaction with moisture. The present invention also relates to a process for the production of a constructional material which is stable in storage.
摘要:
Mixtures of polyols which normally separate into phases are stabilizeed against such separation by including in the mixture a stabilizing amount, preferably from about 0.05% to about 5% based on the weight of polyols in the mixture of an inert surface-active inorganic material having a specific surface of about 10 to about 800 m.sup.2 /g.