CS272972B1 - Self-extinguishing laminated material with polyamide reinforcement - Google Patents

Abstract

The composition of a self-extinguishing layered material on the base of a polyamide reinforcement with low specific weight, designed primarily for electrotechnical purposes. The self-extinguishing layered material apart from good reinforcement - binding material interaction achieves the level of V-O self-extinguishing class according to the UL-94 method. It shows a high resistance against cracking and a good workability. The polyamide reinforcement with surface density from 100 to 350 gm<-2> is impregnated to a content of 40 to 80 percent by weight of dried binding matter, consisting of 100 weight parts of brome epoxy resin of bisphenyl type with weight epoxy equivalent equalling 300 to 750, of 0.1 to 10 weight parts of antimony trioxide, of 7 to 35 weight parts of aromatic diamine and of 0.1 to 10 weight parts of methylol compounds of phenols with molecular weight of 124 to 233.

Description

Polyamide reinforced flame retardant laminate composition A composition of a low density, polyamide based, flame retardant laminate material, intended, in particular, for electrical purposes. Laminated material in addition to excellent reinforcement-binder interaction achieve? the self-extinguishing class of the V-0 stage of the UL-94 method, has high splitting resistance and good workability. a polyamide reinforcement having a basis weight of 100 to 350 gm ⁴ is impregnated to a content of 40 to 80 percent by weight of a dried binder consisting of 100 parts by weight of a diano-type brominated epoxy resin having an epoxy-level of 300 to 750, 0.1 to 10 parts by weight of antimony trioxide; 7 to 35 parts by weight of aromatic diamine and 0.1 to 10 parts by weight of methylol phenol phenols having a molecular weight of 124 to 233.

272 972 (11) ^B1 (51) Int. Cl. ⁵

B 32 B 5 / OO

CS 272972 Bl

The invention relates to a flame retardant laminate based on polyamide reinforcement. The purpose of the solution is to obtain a flame retardant material with good reinforcement-binder interaction that achieves the highest flame retardant class V-0,

In practice, materials with special properties are often required, such as low futile weight, excellent mechanical and electrical insulating properties, good, workability / cold shearability, low water absorption and the like. / Increased fire resistance and flame retardancy are also an urgent requirement. of these materials.

The Búoasnosti known and used worldwide najbežnejěie laminates based on synthetic reinforcements we can substantially cut down ioh composition dvooh divided into ^one group. The first group includes laminates based on phenolic resin impregnated polyamide fabric, which meet all the above-mentioned functional properties, but are flammable and therefore not applicable in many industries. The second group comprises laminates based on polyester fabric impregnated epoxy resin. They are also characterized by good workability, low water absorption and good electrical insulation properties, but they are not self-extinguishing. Hardener - Diphenyanediamide - mainly used to harden epoxy resins, does not guarantee bonding of the binder to the fiber reinforcement and burning particles drip from the laminates during the fire test.

The above-described disadvantages of the prior art completely eliminate the solution according to the invention, which is based on the fact that polyamide reinforcement with a basis weight of

100 to 390 gm is impregnated to a content of 40 to 80 percent by weight of the dried binder consisting of 100 parts by weight of brominated epoxide or diano-type resin with an epoxy equivalent of 300 to 750, 0.1 to 10 parts by weight of antimony trioxide, 7 to 35 parts by weight of aromatic diamine and from 0.1 to 10 parts by weight of methylol phenol compounds having a molecular weight of 124 to 233.

The optimum bonding of the flame retardant laminate is a 150 gm polyamide reinforcement impregnated so that after drying the dried binder content is 45 to 55 weight percent, the binder consisting of a bromo-epoxy resin with a weight epoxy equivalent of 500 and 20.0 weight percent bromine parent, 10 weight percent. parts of 4,4'-diamino-diphenylmethane in interaction! with 10 parts by weight of methylolfenol, which increases the bonding strength of the reinforcement fibers, and the laminate does not drip and release flammable particles during combustion. In order to enhance the flame retardancy, the binder may comprise ¹ 7.0 parts by weight of antimony trioxide; graphite, MoSg to reduce trania up to 50 parts by weight per 100 parts by weight of binder. The binder is diluted to an impregnating concentration of 40 to 80% by weight with ketones (acetone) or other solvents (for example toluene, dimethylformamide, methylol glycol).

The main advantages of the layered material according to the invention are its flame retardancy, achieving high values, i. the material corresponds to the flammability class V-1 and in the optimum composition it reaches the class V-0 according to the UL-94 method. Flammable particles do not drip from the laminate even during combustion, which could cause fire in the surrounding area. A salutary advantage of the solution is the low density of the flame retardant laminate - 1.2 to 1.3 kg m ^, furthermore good processing and flexibility. By using methylolphenols in the impregnation mixture, better adhesion of the epoxy binder to the polyamide fiber is achieved, as a result of which the very good cleavage resistance of the material, which achieves the values of epoxilaminates based on glass fabrics,

The solution is further illustrated by six examples of particular embodiments of the materials of the invention. Examples are given in tabular form, while in the example

CS 272972 Bl

1a, 2a and 3a are 0 reference samples. Table 1 shows the composition of flame retardant layered materials and Table 2 shows the properties of these materials. Table no. 1 - Layered composition material Example # 1 la 2 2 3 3a 4 5 Polyamide net weight fabric / gm “^ / 140 140 140 140 340 340 140 140 spojivo /hmot.diely/ epoxy brominated nutrients / mass eq. 500; Br 20% / 100 100 100 100 100 100 100 epoxy bromine resin / mass equivalent 305; Br 50% / and · 50 low molecular weight epoxy resin / mass equivalent 190 / w w _w 50 4,4'diamínodifenylmetán 10 - 10 10 10 - 6 28 4,4'diamínodifenylmetán - - - - - - 5 - dicyandiamide - 4 - - - 4 - - bismarea accelerator - 2 - - « 1 - - methylolphenol (Mg-resol) 10 - 10 - 10 - - - methylol cresol both 45% solution · · * - w - 11 8 antimony trioxide 7 7 4 4 7 7 7 5

Table no. 2 - Properties of laminated material Example # 1 la 2 2a 3 3a 4 5 UN Self-Burning Time 34 6510 Art. 2.22 Method A / s / 4 3 ^X 6 2 3 5 ^X 4 3 Method B / s / 20 20 ^x 32 52-84 20 20 ^x 30 18 Splitting Resistance / N / 4000 2200

Note: ^x Horiaoe particles drip from the samples during combustion.

The samples only meet the flammability class V-2

The flame retardant laminate according to the invention is used, in particular, in dynamically stressed parts of equipment, as a constructional electrical insulating material for humid environments, and in the manufacturing industry for the production of bushes, sliding surfaces, gears and the like. and its application for structures in the aerospace industry is very advantageous.

OBJECT OF THE INVENTION

Claims (3)

Flame retardant laminate with a polyamide reinforcement impregnated with an impregnating binder, characterized in that the polyamide reinforcement has a basis weight of 100 to Λ 350 gm is impregnated to a content of 40 to 80 percent by weight of a dried binder consisting of 100 parts by weight of a bromine epoxy resin of the diane type with an epoxy equivalent weight of 300 to 750, 0.1 to 10 parts by weight of antimony trioxide, 7 to 35 parts by weight of aromatic diamine 1 to 10 parts by weight of methylol compounds of phenols having a molecular weight of 124 to 233.