DE974177C - Heat-curable electrical insulating varnishes based on silicic acid esters - Google Patents

Heat-curable electrical insulating varnishes based on silicic acid esters

Info

Publication number
DE974177C
DE974177C DES30084A DES0030084A DE974177C DE 974177 C DE974177 C DE 974177C DE S30084 A DES30084 A DE S30084A DE S0030084 A DES0030084 A DE S0030084A DE 974177 C DE974177 C DE 974177C
Authority
DE
Germany
Prior art keywords
acid esters
silicic acid
electrical insulating
heat
insulating varnishes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DES30084A
Other languages
German (de)
Inventor
Wilhelm Dr Kuchen
Robert Dr Schwarz
Fritz Dr Weigel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to DES30084A priority Critical patent/DE974177C/en
Application granted granted Critical
Publication of DE974177C publication Critical patent/DE974177C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
    • C09D129/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Organic Insulating Materials (AREA)
  • Inorganic Insulating Materials (AREA)

Description

Wärmehärtbare elektrische Isolierlacke auf der Grundlage von Kieselsäureestern Es ist bekannt, daß Ortho- oder Polykieselsäureester von aliphatischen oder aromatischen Oxyverbindungen mit rein organischen Kondensationsharzen, wie Alkydharzen, Phenolharzen u. dgl., vermischt werden können. Auch die Umsetzung von polymeren Kieselsäureestern mit polymerisierten Vinylderivaten und Vinylharzen ist bekannt. Diese Kombinationslacke, die vor allem als Isolierstoffe der Elektrotechnik Verwendung finden können, zeichnen sich durch erhöhte thermische Stabilität der Überzüge gegenüber den rein organischen Isolierstoffen aus. Ein gewisser Nachteil dieser Klasse von Stoffen besteht in ihrer Empfindlichkeit gegenüber hydrolytischen Einflüssen. Sie werden verhältnismäßig leicht abgebaut, wobei ihre dielektrische Festigkeit vermindert wird.Thermosetting electrical insulating varnishes based on silicic acid esters It is known that ortho- or polysilicic acid esters of aliphatic or aromatic Oxy compounds with purely organic condensation resins, such as alkyd resins, phenolic resins and the like, can be mixed. Also the implementation of polymeric silicic acid esters with polymerized vinyl derivatives and vinyl resins is known. These combination paints, which can be used primarily as insulating materials in electrical engineering due to the increased thermal stability of the coatings compared to the purely organic ones Insulating materials. One disadvantage of this class of fabrics is theirs Sensitivity to hydrolytic influences. You become proportionate easily degraded, thereby lowering its dielectric strength.

Dieser Nachteil wird erfindungsgemäß dadurch behoben, daß man aromatische Orthokieselsäureester mit Polyvinylacetalen zu Lacken kombiniert, d. h., diese Stoffe werden gemischt, und es findet dabei eine an sich bekannte chemische Umsetzung statt, die hier nicht näher erläutert zu werden braucht.According to the invention, this disadvantage is eliminated by using aromatic Orthosilicic acid esters combined with polyvinyl acetals to form paints, d. i.e., these substances are mixed, and a known chemical reaction takes place, which does not need to be explained in more detail here.

Die hierbei entstehenden Lacke zeichnen sich durch große Laugenbeständigkeit ihrer Überzüge aus, wobei die thermischen Eigenschaften gegenüber den obenerwähnten Kombinationen mit Alkydharzen usw. keine Einbuße erleiden. Die Lacke stellen Isolierlacke der Elektrotechnik, vorzugsweise zur Herstellung von Lackdrähten, dar. Darüber hinaus können sie allgemein als Anstrichstoffe Verwendung finden, wo Werkstücke usw. gegen alkalische Einflüsse geschützt werden sollen. - Beispiel -4oo g m-Kresyl-o-silikat und 6oo g Polyvinylformaldehydacetal werden in 4 kg Cyclohexanon gelöst. Mit dieser Mischung wird Glasseidengewebe imprägniert. Nach einer 8stündigen Aushärtung bei r40° C wird ein Muster dieses imprägnierten Gewebes in wässeriger 2n-Kalilauge gekocht. Nach 2 Stunden befindet sich immer noch ein kompakter Lackfilm auf dem Glasgewebe. Im Vergleich hierzu werden unter gleichen Versuchsbedingungen rein organische Lacke nach spätestens 6o Minuten und Kieselsäureester-Kombinationen mit organischen Kondensationsharzen nach spätestens 2o Minuten so stark abgebaut, daß das Glasgewebe völlig frei liegt.The resulting paints are characterized by their high resistance to alkalis of their coatings, with the thermal properties compared to those mentioned above Combinations with alkyd resins etc. do not suffer any losses. The paints provide electrical engineering insulating varnishes, preferably for the production of enamelled wires, In addition, they can generally be used as paints where Workpieces etc. should be protected against alkaline influences. - example -4oo g of m-cresyl-o-silicate and 600 g of polyvinylformaldehyde acetal are dissolved in 4 kg of cyclohexanone solved. Glass silk fabric is impregnated with this mixture. After an 8 hour Curing at r40 ° C, a sample of this impregnated fabric is made in water Boiled 2N potassium hydroxide solution. After 2 hours there is still a compact paint film on the glass fabric. In comparison, the test conditions are the same purely organic lacquers after 60 minutes at the latest and silicic acid ester combinations with organic condensation resins so strongly degraded after 20 minutes at the latest, that the glass fabric is completely exposed.

Claims (1)

PATENTANSPRUCH: Wärmehärtbare elektrische Isolierlacke auf der Grundlage von Kieselsäureestern, dadurch gekennzeichnet, daß sie aromatische Orthokieselsäureester und Polyvinylacetale enthalten. In Betracht gezogene Druckschriften: USA.-Patentschrift Nr. 2 507 422.PATENT CLAIM: Thermosetting electrical insulating varnishes based on of silicic acid esters, characterized in that they are aromatic orthosilicic acid esters and polyvinyl acetals included. References contemplated: United States Patent Specification No. 2,507,422.
DES30084A 1952-09-04 1952-09-04 Heat-curable electrical insulating varnishes based on silicic acid esters Expired DE974177C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES30084A DE974177C (en) 1952-09-04 1952-09-04 Heat-curable electrical insulating varnishes based on silicic acid esters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES30084A DE974177C (en) 1952-09-04 1952-09-04 Heat-curable electrical insulating varnishes based on silicic acid esters

Publications (1)

Publication Number Publication Date
DE974177C true DE974177C (en) 1960-10-06

Family

ID=7480009

Family Applications (1)

Application Number Title Priority Date Filing Date
DES30084A Expired DE974177C (en) 1952-09-04 1952-09-04 Heat-curable electrical insulating varnishes based on silicic acid esters

Country Status (1)

Country Link
DE (1) DE974177C (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507422A (en) * 1945-05-29 1950-05-09 Montelair Res Corp Oxidative polymerization of silicic acid esters

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507422A (en) * 1945-05-29 1950-05-09 Montelair Res Corp Oxidative polymerization of silicic acid esters

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