摘要:
The invention pertains to an aerobically curing composition comprising free-radical polymerizable compounds, an activator system, and optionally conventional additives, characterized in that said composition contains as said free-radical polymerizable compounds at least one polyurethane (meth)acrylate one or more (meth)acrylate comonomers; wherein said composition contains from 20 to 80% by weight of said polyurethane (meth)acrylate and from 80 to 20% by weight of said (meth)acrylate comonomer(s), based on the total of polymerizable compounds, and said activator system is a hydrazone activator system, as well as the preparation and use of said composition.
摘要:
Aerobically hardening adhesives based on polymers of acrylates or methacrylates having a relatively high boiling point such as polyurethane (meth)acrylates are described, wherein the adhesives contain at least one initiator capable of forming free radicals, at least one accelerator, and at least one siccative. Such adhesives are largely odorless and harden completely such that the adhesive surface at the boundary with air is not tacky.
摘要:
A reaction adhesive becomes porous after hardening. This allows both small and larger gaps to be sealed between the bonded substrates, as the liquid adhesive has a low to medium viscosity and the hardened glue shows a marked volume increase. Reaction adhesives based on (meth)acrylates and that contain azo-bis-isobutyronitrile as initiator and expanding agent are preferably used. The disclosed reaction adhesive is preferably used for gluing reactive coils.
摘要:
The invention relates to the addition of dyes to aerobically curable adhesive compositions based on free-radically polymerizable compounds. The dyes serve as user-friendly indicators for monitoring the oxygen intake required to trigger the polymerization. The indicator dyes are especially suitable for aerobically adhesive compositions which contain activator systems for forming peroxides upon contact with air. Suitable dyes and indicators are those whose color change in aqueous solution lies within a pH range from 3.0 to 6.5.
摘要:
An aqueous cleaning and disinfecting concentrate comprisingA) at lease one reaction product ofa) an N-substituted propylene diamine of formula IR.sup.1 --NH--(CH.sub.2).sub.3 --NH.sub.2 (I) in which R.sup.1 is a C.sub.8 -C.sub.18 alkyl group andb) glutamic acid or a glutamic acid derivative of formula IIR.sub.2 --O--CO--(CH.sub.2).sub.2 --CH(NH.sub.2)--COOH (II) in which R.sup.2 is hydrogen or a C.sub.1 -C.sub.4 alkyl group, wherein the said reaction product is optionally ethoxylated and/or propoxylated, and is optionally in the form of a salt with an organic or inorganic acid;B) at least one of the following antimicrobially active compounds:i) a quaternary ammonium compound of formula III ##STR1## in which R.sup.3 and R.sup.4 independently of one another represent alkyl radicals containing 1 to 3 carbon atoms or benzyl radicals, or halogenated or alkylated benzyl radicals containing 6 to 22 carbon atoms, and X.sup.- is an anion;ii) a phenol;iii) a biguanide;(iv) a quaternary phosphonium compound of formula IV ##STR2## in which R.sup.7, R.sup.8, R.sup.9 and R.sup.10 are each independently an alkyl, alkenyl, aryl, or alkaryl group having from 1 to 16 carbon atoms, and Y.sup.- is an anion; andC) at least one low foaming surfactant.The invention also relates to the diluted concentrates, and to the method of use of the diluted concentrates, especially for the disinfection of medical equipment.
摘要:
The invention relates to a method for carrying out a chemical reaction for producing a target compound by heating in a reactor a reaction medium containing at least one first reactant, such that a chemical bond inside the first reactant or between the first and a second reactant is formed or modified. The reaction medium is brought into contact with a solid heating medium that can be warmed by electromagnetic induction and that is inside the reactor and is surrounded by the reaction medium. Said heating medium is heated by electromagnetic induction with the aid of an inductor and the target bond is formed from the first reactant or from the first and a second reactant and said target bond is separated from the heating medium.
摘要:
The invention relates to chemically or physically curable compositions suitable as adhesives or sealants or coating materials, which compositions contain at least one binding agent selected from the group comprising crosslinkable or polymerizable monomers, prepolymers, or polymers, as well as at least one filler. The filler proportion is 0.2 to 70 wt % based on the total weight of the compositions, and at least a portion of the filler is made up of glass particles having a particle size from 100 nm to 20 μm, which have been obtained by comminuting foamed neutral or acid glass.
摘要:
A clear aqueous disinfectant compositon containing the reaction product of (a) an N-substituted propylenediamine corresponding to formula I:R.sub.1,--NH--CH.sub.2 --CH.sub.2 --CH.sub.2 --NH.sub.2 (I)in which R.sub.1 is a linear alkyl radical containing 12 to 14 carbon atoms, and (b) a compound corresponding to formula II:R.sub.2 --O--CO--CH.sub.2 --CH.sub.2 --CH(NH.sub.2)--COOH (II)in which R.sub.2 is a hydrogen atom or an alkyl radical containing 1 to 4 carbon atoms, in a molar ration of(a) to (b) of from about 1:1 to about 1:2, respectively, and further containing (c) a solubilizer selected from the group consisting of benzyl alcohol, 2-phenoxyethanol, 1-phenoxypropanol, and mixtures thereof.
摘要:
A method for performing a chemical reaction to produce a target compound by heating a reaction medium containing a reactant in a reactor, the reaction medium being brought into contact with a solid heating medium that can be heated by electromagnetic induction and that is located inside the reactor and surrounded by the reaction medium and the heating medium being heated by electromagnetic induction with the aid of an inductor, causing the target compound to form, and the target compound being separated from the heating medium, wherein the target compound has a lower molar mass than the reactant and at least one covalent bond of the reactant is cleaved in order to produce said target compound from the reactant.
摘要:
The invention relates to a molded part for bonding to metal or plastic substrates for use as a fastening element. Said molded part comprises a hot melt adhesive, said hot melt adhesive being based on polyamide, polyolefins, polyesters, polyacrylates or polystyrene. The molded part according to the invention is characterized in that the hot melt adhesive has a softening point between 100° and 250° C., a tensile stress at yield of between 1 and 35 MPa and the molded part consists entirely of the hot melt adhesive. The invention also relates to a method for bonding molded parts from hot melt adhesives to substrates by way of inductive heating.