SU1657517A1 - Binding agent for glass-reinforced plastic - Google Patents

Abstract

This invention relates to a binder based on epoxy-phenolic resins for the production of glass-reinforced plastics, mainly by the method of dry winding and pressing used in mechanical engineering, electrical engineering and other industries. The aim of the invention is to increase the strength and water resistance of fiberglass under the conditions of prolonged heating in water at 80-100 ° C. The binder contains, in wt%: epoxy resin Dianova 50-70; the modifier is a technical mixture of polysulfides 0.5-6; Phenol-formaldehyde resin resol - 100. Table 2.

Description

The invention relates to a binder based on epoxy-phenolic resins (varnishes) for the production of glass-reinforced plastics, mainly by the method of dry winding and pressing used in mechanical engineering, electrical engineering and other industries.

The aim of the invention is to increase the strength and water resistance of fiberglass under conditions of prolonged heating in water at 80-100 ° C.

Example. Compositions are prepared that include different ratios of ED-16 epoxy-dian resin, resole-type phenol-formaldehyde resin — LES-16 bakelite lacquer, and a polysulfide technical mixture modifier. Considering that LBS-16 bakelite varnish is an alcoholic solution of phenol-formaldehyde resin, the calculation is based on the mass fraction of the resin.

The composition is prepared by combining the ingredients, followed by mixing in a mixer at 20 ± 2 ° C.

To evaluate the properties of glass-reinforced plastics on an industrial impregnating machine, a glass fabric of the grade TCU 8/3-BM-78 is impregnated.

Impregnation parameters: speed 1.09 m / min; temperature in mines 110 ± 10 ° С.

The impregnated glass fiber binder has the following characteristics:

Mass should be a binder. % 30t2 Massive vol.% 1 + 0.5

Mass fraction of soluble substances, not less than% 95 Plate pressing mode, ° С / h: heating to 160 ± 5 ° С 2 ± 0.5 h, holding at 160 ± 5 ° С 0.5 h / mm thickness, cooling - natural; specific pressing pressure 25 + 5 kgf / cm.

The time of gelatinization of the binder is determined at 160 ± 2 ° C on a polymerization plate by the known method.

The viability of the impregnated binder fiberglass (prepreg) is evaluated when stored in room (20 ± 2 ° C) conditions according to the time during which the mass fraction of soluble substances does not change.

The glass transition temperature of the polymer is estimated by the method of torsion

Yo

About SP

Vj ate

J

on impregnated binder glass yarn and then cured according to the mode, ° C / h: 100/2; 160/3.

The physicomechanical tests of samples of glass-reinforced plastics: tensile strength, compression, and static bending are carried out by standard methods.

Samples are cut from the slabs in the direction of the glass fiber base.

Water absorption fiberglass assessed as follows. Samples for determining the strength under static bending are placed in distilled water and kept at 80-100 ° C for 20 hours. First, water absorption is determined by a known method, and then the strength under static bending.

Table 1 shows the compositions of the investigated compositions.

In tab. Figures 2 and 3 show the results of tests of various binder and fiberglass based formulations.

Formulas and inventions Binder for fiberglass, including epoxy resin, phenol-formaldehyde resin and modifier, characterized in that. that, in order to increase the strength and water resistance of fiberglass under conditions of prolonged heating in water at 80-100 ° C. as a modifier, the binder contains a technical mixture of a polysulfide of the general formula

CH, CH,

3.3

H3c-cn3 n3c-cn3

Where

in the following ratio, wt.%:

Epoxy Dianova Resin 50-70 Modifier 0.5-6

Phenol formaldehyde resin resal

Ingredients Composition

Epoxy-Dianova resin

ED-1665

Phenolformaldegna resin resolmigo type (Oakelity varnish LVS-16)

Chromium Pigment Oxide

Naphthalene-1, 4,:,, 8-tetracarvanoic acid derivative 0,2

technical mixture of polysulfands (stabilizer TAB)

31.3

3.5

Indicators

Properties of the binder:

gelatinization time, min

prepreg failure, days

glass-to-polymer temperature (in contact with glass fiber), C

Table 1

Contents of ingredients, by weight.X, in the composition of Iesvest 1 1 2 13 1 4

50556070

31,349.5 45.3 3724

3.5

0.51.53

Table 2 Data binder composition

(Notify

CALVING

8.5 8.5 8.5 8.5 8.5 6 6666

65

67 70 72 70

Indicators

news П Т 2 Т 3 1 4 Г5 Т Т

Properties of fiberglass:

tensile strength, kg / i 1

compressive strength, kg / mm

strength at static bending, kg / mm

waterglotskie, X (after holding in water for 20 h)

strength under static bending (after tests on post-absorption), kg / m

46 25 55

10 15

5052575440454240

3035403620242220

5864686550525048

.72,53,08,08,09,010,0

2025353017171510

Reception. Compositions 5 - 8 - control.

Table 3

Given its composition

Claims (1)

Claim A binder for fiberglass, including epoxy Dianova resin, rezol phenol-formaldehyde resin and 5 modifier, characterized in that. that, in order to increase the strength and water resistance of fiberglass under conditions of prolonged heating in water at 80-100 ° C, the binder contains as a modifier a technical mixture of polysulfides of the general formula CH _H CH, I ³ I ³ c s.-g-gi and g-g-sn where n = 1-4 in the following ratio of components, wt.%: Epoxy Dianne Resin 50-70 20 Modifier 0.5-6 Resol phenol-formaldehyde resin Table 1 Composition ingredients Content ingredients. IAS.X, in composition Lime  1 ² : □ Epoxy Diana Sheaf ED-16 65 fifty 55 60 70 phenol-formaldehyde resin of reheol type (Bakelite varnish LAN-16) 31.3 49.5 45.3 37 24 Pigment chromium oxide 3,5 - - - - Derivative of naphthaln-1,4,5,8-tetracarboxylic acid 0.2 technical mixture of polysulfides (TAB stabilizer) 0.5 ',5 3 1 6 table 2 Indicators Well known! Binder Composition Data ΞΙΖ Binder Properties: gelatinization time, min 8.5 prepreg viability, days 6 polymer glass transition temperature (in contact with fiberglass), ° C 65 8.5 8.5 8.5 8.5 6 6 6 6 67 70 72 70 Table 3 Indicators Composition Data Lime Ε_ΙΞΙΞΖΕΞΞΣΞΙΪΈ Fiberglass properties: tensile strength, kg / and compressive strength, kg / mm * 'static bending strength, kg / mm water absorption, Ζ (after exposure to water at 2О * 2 * С for 20 h), static bending strength (after water absorption tests), kg / mm 46 fifty 52 57 54 40 45 42 40 25 thirty 35 40 36 20 24 22 20 55 58 64 68 65 fifty 52 fifty 48 10 3.0 2.7 2,5 3.0 8.0 8.0 9.0 10.0 fifteen 20 25 35 thirty 17 17 fifteen 10 Note. Compounds 5 to 8 are control.