Synthetic resin based binder for glass fiber laminate used in electrical engineering

FIELD: electric insulating materials; synthetic resins or glass fiber laminates for producing binders of laminated plastics used, for instance, as insulation for low-voltage equipment.

SUBSTANCE: main drawback of prior-art binders is difficulty to predict, and in some cases to reproduce, curing and molding conditions. As a result, binder leak-out and its heavy loss, as well as flaws on glass fiber laminate surface may occur in the course of molding. Proposed binder for glass fiber laminate has ingredients and their proportion, as follows, mass percent: resol resin, 12-16; novolac resin CF-010, 2-16; epoxy resin, 12-16; n-tertiary butyl-phenol-formaldehyde resin 101L or 101K, 0.5-15; alcohol-toluene mixture (1 : 1), 40-50.

EFFECT: reduced leakage of binder in the course of molding, eliminated flaws on glass fiber laminate surface.

1 cl, 1 dwg, 1 tbl, 4 ex

 

The invention relates to electrical insulating materials, namely, laminated plastics (glass textolites)used, for example, in the isolation of low-voltage equipment.

Known binder based on rezol and epoxy resins [Bachmann C., Muller K. Phenolic plastics. M., 1978, Chap 1; Knop, A., SAB Century Phenolic resins and materials on their basis. M.: Chemistry, 1983]. The main disadvantage of these compositions is trudnoporoshkuemye and in some cases poorly reproducible mode of curing of the binder during pressing. As a result, the pressing process may be escaping binder and a significant loss, as well as defect formation on the surface of the glass.

The introduction of modifying additives, for example, ε-caprolactam [Sidorenko HP, Dulitzky G.M., Zinin E.F. and other Binder for insulating phenolic. A.S. No. 1083238. BI No. 12] allows to improve the quality of the fiberglass, but not completely solve the problem.

The purpose of the invention is to reduce leakage of the binder in the process of pressing and fixing defects on the surface of the glass.

This objective is achieved in that the binder contains rezol, Novolac, epoxy and p-tert-butylbenzaldehyde resin in an organic solvent in the following ratio of components, %:

- rezol resin12-16
- Novolac resin SF-01012-16
epoxy resin ED-1612-16
- p-tert-butylbenzaldehyde resin0.5 to 1.5
- spirtitually mixture, wt.% (1:1)40-50

The introduction of a Novolac resin in the system allows to receive high-polymer at an early stage of the curing reaction (above 100° (C) due to the terminal methyl groups of the Novolac resin and methyl groups rezol components. This reaction is preceded by condensation of epoxy and phenolic hydroxyl groups of the audio record and novolak, which occurs at higher temperatures (above 140°). In the absence of the formation of high-polymer at low temperatures there is a leak of binder - add novolak significantly reduces the viscosity of the system at an early stage of curing and prevents leakage. Phenol-formaldehyde resin based on p-tert-butylphenol significantly increase the flowability of the epoxy-phenolic compositions on glass. This phenomenon can be explained by the reduction in interfacial tension at the interface binder - glass (drawing). p-Tert-butylbenzaldehyde resins are thermally stable and retain their surface-active properties p and elevated temperatures. This property is a small additives of p-tert-butylbenzaldehyde resins contributes to a more uniform distribution of the binder in the packages prepregs during consolidation and elimination of surface defects on the fiberglass laminate.

Thus, in use of the present compositions to obtain prepregs and their subsequent pressing can be almost completely eliminate the leakage of the binder during compaction and to avoid the formation of defects on the surface of the glass.

The invention is illustrated by the following examples.

Example 1. Getting rezol resin

In a reactor with a volume of 4.0 m3equipped with anchor stirrer, steam-jacketed, back and sloping condenser and vacuum system (up to 0.6 kgf/cm2rarefaction) download 1395 kg 86%solution of phenol in water, 1200 kg of 37%formalin solution in water and 72 kg of 25%aqueous ammonia solution and heated to 57-63°when cooled back of fridge water. Further temperature rise occurs due to the exothermic reaction: temperature of 90-100°observed the boiling reaction mixture. When the boiling temperature of the reaction mixture was incubated for 3-5 min, then cooling water serves on the inclined refrigerator, turn off the cooling water in the reflux and distilled water PR is the degassing of the system and the temperature of 65-80° C. After the beginning of the gelled resin begin sampling. The synthesis is considered complete when a sample of the resin hardens when cooled and slightly resinit. The finished resin is dissolved in spirtitually mixture, wt.% (1:1). The mass fraction in the solution should be (60±2)%.

Example 2. Manufacturer combined binder resin L

As novolak use of a phenol-formaldehyde resin SF-010 (GOST 18694-80); use epoxy resin ED-16 (GOST 10587-84); as p-tert-butylbenzaldehyde - resin L (TU 6-10-1261-80).

In a reactor volume of 6.0 m3equipped with anchor stirrer, steam-jacketed, back and sloping condenser and vacuum system (up to 0.6 kgf/cm2rarefaction) download 1696 kg rezol resin in the form of a 60%solution in organic solvents, 2120 kg of epoxy resin ED-16 in the form of a 75%solution in toluene. With stirring and mild heating (up to 50° (C) in the solution is gradually introduced 1272 kg Novolac resin SF-010 and 40 kg of p-tert-butylbenzaldehyde resin L. The combined product is stirred until complete dissolution of the solid resins. Before impregnation combined lacquer is diluted to a viscosity spirtitually mixture, wt.% (1:1).

Example 3. Manufacturer combined binder resin C

As novolak use fenoli maldehyde resin SF-010 (GOST 18694-80); as use epoxy resin ED-16 (GOST 10587-84); as p-tert-butylbenzaldehyde - resin K (TU 6-10-1261-80).

In a reactor volume of 6.0 m3equipped with anchor stirrer, steam-jacketed, back and sloping condenser and vacuum system (up to 0.6 kgf/cm2rarefaction) download 1696 kg rezol resin in the form of a 60%solution in organic solvents, 2120 kg of epoxy resin ED-16 in the form of a 75%solution in toluene. With stirring and mild heating (up to 50° (C) in the solution is gradually introduced 1272 kg Novolac resin SF-340 and 51 kg of p-tert-butylbenzaldehyde resin C. The combined product is stirred until complete dissolution of the solid resins. Before impregnation combined lacquer is diluted to a viscosity spirtitually mixture, wt.% (1:1).

Example 4. Obtaining prepregs based on fiberglass and composite resins

Obtaining the prepreg is carried out on an impregnating machine for technological mode:

the temperature in the mine impregnating machine, °100-115
- the speed of impregnation, m/sto 4
- working density of varnish, g/cm30,962-0,967

The obtained prepreg has the following characteristics:

- mass fraction of the resin, %38-40
mass fraction of volatile substances, %, no more than2,5
- mass fraction of soluble resin, %, not less than90
- bleeding gums, %, not more than20
the time of gelation of the binder, with not less than60

Example 5. Getting fiberglass pressing

The pressing is carried out on vertical presses with two levels of temperature and pressure. The assembled package of the prepreg is placed in a press, a lift for 45 minutes the temperature to 100-120°install a pressure of 15-20 kg/cm2and incubated for 30 minutes Raise the temperature to 155-160°set pressure of 40-45 kg/cm2and maintain the rate of 20 min per 1 mm thickness of the package. After holding a press cool and extract the package.

Binder based on synthetic resins for fiberglass electrical components, characterized in that, to improve the technological properties of the binder, reducing leakage in the process of pressing and fixing defects on the surface of the fiberglass, binder contains the following components, wt%:

rezol resin2-16
Novolac resin SF-01012-16
epoxy resin ED-1612-16
p-tert-butylbenzaldehyde resin L or K0.5 to 1.5
spirtitually mixture, wt.% (1:1)40-50



 

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