SU859400A1 - Impregnating composition for textolite - Google Patents

Description

(B4) DRINKING COMPOSITION FOR TEXTOLITIS The invention relates to impregnating compositions based on bakelite varnishes, alcohol solutions of resole phenol-formaldehyde resins, intended for the production of laminated plastics, in particular textolite. It is known that thermosetting polymers are used as impregnating compositions in the production of laminated plastics. The wear resistance of the resulting materials largely depends on the type of impregnating composition used. Of the known impregnating compositions, alcohol solutions of resole phenol-formaldehyde resins — Bakelite lacquers 1 — are the most common. In the production of laminated plastic on the basis of cotton textiles of textolite, an impregnating compound is used - bakelite lacquer, which is an alcohol solution of re-aeol phenol-formaldehyde resin with a viscosity of 600-2500. On the basis of a known composition, textolite of various grades is obtained, which is used in friction units, in particular, when working with halogen pairs of textolite, textolite — nonferrous metals 2 — has become. similar in technical essence and the achieved result to the proposed is an impregnating Composition based on an alcoholic solution of a phenol-formaldehyde resin with a content of 70-2000 NPa-s and graphite in a ratio of 98.2-98.8: 1.2-1 , 8 (parts by weight 4. Textolite obtained on the basis of the specified known impregnating composition (including bakelite lacquer and graphite) also does not meet the requirements of modern textile engineering in terms of wear resistance (with friction - sliding on steel, wear is 15-17 mg / h. The purpose of the invention is to increase the durability and strength of the textolite. The substituted objective is achieved in that the impregnating composition contains an alcoholic solution of a phenol-formaldehyde resin with a viscosity of 80-300 MPa-s and additionally contains moth disulfide Deng, polyvinyl butyral and surfactant aktivmoe substance - oxyethylenated alkylphenols in the following ratio, mae.ch .: alcoholic solution of phenol-formaldehyde resin with a viscosity 80-300 mPas

92.78-95.55 Graphite 2.06-3.08

Molybdenum disulfide 0.77-1.30 Polyvinyl butyral 1,10-1,54 Surfactant (OP-7, OP-10)

0.52-1.30

The use in the impregnating composition of an alcoholic solution of a phenol-formaldehyde resin with a viscosity of 80-300 MPa-s and the addition of certain amounts of additives to the composition: graphite, molybdenum disulfide, polyvinyl butyral, and surfactant can significantly increase the wear resistance of a PCB based on it,

Table 1 presents examples of the proposed impregnating composition

Contents, parts by weight, using an alcoholic solution of phenol-formaldehyde smelly with a viscosity of 80 (example 1), 200 (example 2), 300 MPa-s (example 3) and a known impregnating composition (example 4).

The dry residue in the alcohol solution of the phenol-formaldehyde resin is 55-56%.

Tests show that the PCB obtained using the proposed impregnating composition, has a strength of 1.3-1.5 times Btane than known.

In addition, the use of the proposed impregnating composition makes it possible to increase the wear resistance of 5 textolite 3-10 times.

On the basis of the proposed impregnating composition and the known samples, the PCB was made with a thickness of 2 mm. The wear resistance is determined by friction of the samples on steel.

Physico-mechanical properties of the PCB are presented in table 2.

Table 1 measure

Surfactant (OP-7 or

0.52 OP-10)

Izyrs, mg / h

Destruction stress at static bending, MPa (kgf / cm

Destructive stress at stretching, MPa

(kgf / cm (1901)

1.30

1.03

table 2

3.8 .11.7

219.3165

(2238) (1684)

161126

(1647) (1284)

Claims (4)

1. Shalun G. B. Manufacture of products from laminated plastics. L., Himi, 1975, pp.5-8. 2. Bakelite GOST 90178. 3. Authors certificate of the USSR 75480, cl. C 08 L 61/10, 1949. 4. Technological regulations for the production of cotton fabrics, fiberglass, fiberglass and woven fabric, 5 impregnated with phenol-formaldehyde resins of rezol type or varnishes based on them. Kemerovo NPO Karbolit. P-169-78 (prototype).