SU876682A1 - Prepreg - Google Patents

Description

The invention relates to the preparation of glass fiber filler and epoxy binder prepregs, which can be used as press materials for the production of glass plastics and electrical and radio engineering products manufactured by methods of pressing, vacuum forming, winding, etc. The epoxy compositions are known and prepregs based on them, containing epoxyaniline and novolac phenol formaldehyde resins 1. The disadvantage of this prepreg is the low stability of the deel (electric actorist from 20 to. Also known is a prepreg containing part by weight: epoxy resin Dianova 54240, phenol-OOH-aldehyde resin 2914Q, copolymer of butyl methacrylate with hydroxy peroxide of polybenzyl 9-81, filamentous filler 99-103, possessing good technological properties () and good technological properties ()) ()))))))))))); 2. The disadvantages of this prepreg include its low viability and insufficient stability of the dielectric characteristics of plastics.

(54) PREPREG based on it in the temperature range from 20 to. The closest technical solution to the present invention is a prepreg based on glass fiber filler (100 parts by weight) and a binder containing epoxy aniline resin (100 weight parts), polychlorobiphenyl (20 60 weight parts) and phenol-formaldehyde resin. (60-120 parts by weight) of Novolac type 3. The disadvantage of such a prepreg is unsatisfactory technological properties, low approval rate, slow build-up of melt capacity, insufficient viability / and low stability of dielectric parameters of glass-reinforced plastics. The purpose of the invention is to improve the technological properties of the prepreg and increase the stability of the dielectric parameters in the temperature range from 20 to 15cf. C fiberglass ria is its basis. additionally contains paraaminobenzenesulfamide in the following ratio of components,

weight:

Epoxy aniline resin 40-90 Polychloride biphenyl 5-60 Novolacs phenol-formaldehyde resin 2-60 Para-aminobenzenesulfamide 1-40

Fiberglass filler5-900

Example 1. In a reactor equipped with a heated mixer, load phenol-formaldehyde condensate novolac type 40 weight.h. and para-aminobenzenesulfonamide 3 weight.h. and an alcohol-acetic mixture is added with constant stirring until complete dissolution in this mixture of components and then 60 parts by weight of epoxy groups and Polychloridiphenyl 30 are added to the resulting solution with constant mixing (EA brand) 60 parts by weight containing 32% epoxy groups parts by weight. After that, the binder is diluted with an alcohol-acetone mixture to the technological viscosity with a conventional T-11 glass fabric. The glass fabric is taken in an amount of 400.h. The resulting prepreg is recycled; in a product by a vacuum forming method.

Example 2. Carried out analogously to example i, Ho is taken.

The following composition of prepreg, weight.h .; Epokoianilina resin90

Polychlorinated biphenyl5. New phenol formaldehyde resin 2

Para-aminobenzenesulfamide 40 Fiberglass filler5

Example 3. Carried out analogously to example 1, but with the following component assignment, parts by weight: Epoxy aniline resin 40 Polychlorinated biphenyl, 60 Novolac phenol formaldehyde resin 60 Paraaminobenzene sulfamide 1 Fiberglass filler 900 Example 4. Carried out in the same way as in Example 1, but brand T-22-73.

Froze Carried out analogously to example 1, but at the same time take fiberglass marks НПУ-76.

Example 6. The procedure was carried out analogously to example 1, but H1 ethylene reinforcing material of the NBU-76 grade was used as a glass fiber filler with the following ratio of ponents, parts:

Epoxy aniline resin 60 Polychlordiphenyl 30

Novolacna phenol-formaldehyde resin 40 Para-aminobenzenesulfamide 20 Fiberglass filler400

. L irim 7. It is carried out analogously to Example 1, but the RBN-10-1260-289A roving is used as the stearalo-fibrous filler.

Properties .prepregov.and fiberglass on their osnrve in examples 1-7 in comparison with the known are given in the table.

The value of the indicators proposed by the prepreg examples

Indicators

.1 5I6.

Properties of the prepreg. Storage stability, days Elastic. The elasticity of the prepreg. Not sticky, lay down.

rem hardening at min

3

min

20 8 5

20 8.

130 ° C, min

five

140 C, min

The value of indicators known prepreg

7

1440

20

120

50

25 Elasti-Elasti-Fragile cheng amasma- Not slip-Not slip-Sticks, does not smudge.

Properties of glass-reinforced plastics Strength at static bending, kgf / cm Strength at stretching, kgf / cm Tangent of dielectric loss angle at 10 IJn C Tangent of dielectric loss angle at. Hz t 100 ° C Tangent of angle dielectric loss at 10 ° Hz Dielectric constant at Hz Dielectric permeability 10 Dielectric constant at Hz Tangent dielectric loss angle at Hz s after

exposure to 98% moisture

for 10 days 0.021 Dielectric permeability at 10 Hz after exposure to 98% humidity for 1e 10 days As can be seen from the data presented in the table, the proposed prepreg has a higher viability and curing rate {1 / 7-400 times higher than that of known making it possible to use it in the manufacture of products of complex configurations by the method of compression pressing without flowing the binder into the pressing procedure. Known prepregs, due to leakage of the binder, do not allow to obtain high-quality products. In addition, increasing the curing rate of the proposed preprag will increase productivity in processing it into products. However, the main advantage of the proposed prepreg is the continuation of the table

Claims (2)

1. USSR author's certificate 755S21, cl. C 08 L 63/00, 1978, 2. Authors certificate of the USSR 744009, cl. C 08 L 63/02, 19783. Copyrights CCQP 331074, cl. C 08 G 45/08, 1973 (prototype).