SU331692A1 - - Google Patents

Description

The invention relates to the preparation of laminar foam plastics based on rezol phenol-formaldegnd cold-cured resins.

Known foam-based plasmids based on phenol-formaldehyde resins (PFP) are lightweight, lightweight, have good dielectric, heat and sound insulating properties. However, their thermo-oxidative stability is insufficient.

The purpose of the invention is to develop a method that allows to obtain penoploplasts with increased resistance to thermal oxidation without a significant change in production technology.

This is achieved by introducing dimethyl-di (-phenylaminophenoxy) silane (C-1) into the resin part of the starting composition in an amount of from 0.5 to 5 weight. hours per 100 weight. including the original resin. The compound is introduced into the resin as a solution. A solvent that is common to the phenol formaldehyde resin and an additive is chosen as the solvent.

These solutions can be introduced into the resin part of the starting composition both by leaching and by foaming, as well as by

long before him. In the latter case, it is not necessary to mix the resin part with the composition before foaming.

Example 1. Mix 100 weight. including phenol-resin of aldehyde resin VIAM-B, 8 wt. including product OP-7 and 1.25-2.0 weight. including aluminum PAK-3 resin (resins per part of COLEPOSITION), add 1 wt. h. C-1 in the form of a 20% strength solution in acetone and thoroughly mixed until a system that is homogeneous in viscosity and color is created. Separately mix 5 wt. h. contact Petrova and 3-6 wt. including hydrochloric acid (27%).

To obtain the yenonlast, the resin and acid parts are poured together, mixed thoroughly and poured into a restrictive form. After about 10 minutes, the free-foaming process begins to build up. The resulting material has a yellowish-pink color i volumetric weight of 50-250 kg / cm (depending on the ratio of A1 - powder and HC1).

Thermal-oxidative stability of penofenoplasts is evaluated by Bevinqn-He weight loss of PFP at 450 ° C before and after staining in air at 200 ° C for 50 hours. The results of the tests are presented in table. one.

Example 2. Penofenoplast according to Example 1 was prepared. To the resin mixture was added 3 wt. including C-1 in the form of a 30% solution in acetone. Thermo-oxidative stability of the assessor S-1 for thermo-oxidative stability of an IFP

example 1 and on the change of ph / iziko-mechanical indicators. The test results are presented in Table. 1 (experiment 3) and in table. 2 (experiment 2).

Table 1

1. Initial PFI

2. With the addition of C-1

3. With the addition of C-1

4. With the addition of C-1

Example 3. The peiophenoplast of Example 1 is obtained. To the resin mixture, 5 1 weight is added. including C-1 in the form of a 30% solution in acetone. Thermal-oxidative stabling of С-1 and physicomechanical properties of PFP

1. Initial Penollast - 3.0 - 52,

2. With the addition of C-13 4.2 1.4 77.0-10- 1.47

3. With the addition of C-15 5.1 1.70 85,, 62

Subject invention

A method for stabilizing polymeric materials, for example, a penollast, based on a phenol-formaldehyde resin, characterized in

Pbnosti PFP similar to example 2. The test results are presented in table. 1 (experiment 4) .and table. 2 (experiment 3).

Table 2

that, in order to increase and resistance to heat treatment, dimethyl-di- (α-phenylaminophenoxy) silane is introduced into the phenol-formaldehyde resin in an amount of 0.5 to 5 wt. hours, 100 weight. h. resin.