SU834030A1 - Composition for producing phenol porous plastic material - Google Patents

Description

The invention relates to the manufacture of plastics and relates to the development of a composition for the production of phenolic foam. A known composition for the preparation of a phenolic poroplast, comprising a resol phenol-formaldehyde resin, an acidic hardener and a water-producing / water-based filler at a ratio of, respectively, wt.%: 20.7 - 40.5 2.4-4.8, the rest flj. However, this composition does not provide for obtaining high-strength air-permeable foamed plastic. The goal is achieved by the fact that the composition for the preparation of phenol poroplast, comprising a resol phenol-formaldehyde resin, an acidic hardener and a water-borne filler, additionally contains phenol in the following ratio of components, wt.%; Phenol resin resole hydrodehydrate 20.7-40.5 resin 2.4-4.8 - Acid hardener 3.7-, 7.1 Water reusable The rest of the filler Examples 1-5. To fabricate, the NIN samples of the poroplast are weighed in the resin, the calculated amount of phenol, washed salt is introduced into it, the mixture is stirred and a hardener is added with stirring. The resulting mixture is poured into a mold, then heat treated at 100 ° C for 30-40 minutes. Table 1 shows the change in the strength characteristics of the material depending on the amount of phenol introduced for cubes of 2 cm with NevV-P-salt. Table 2 shows the change in filtration characteristics depending on the amount of phenol introduced. Examples 6-13. The process is carried out analogously to example 1-5. After heat treatment, salt is eliminated. The compositions and properties of the foam are presented in table 3. The increase in strength is 12-40%. Strength indicators converted to a live section, i.e. The area occupied by the crust substance, except for voidness, is presented in Table 4.

From the data of Table 4 it can be seen that, despite the increase in the amount of filler in the polymer, the number of defective structures increases, the compressive strength for compositions. The optimum content of phenol in terms of the living section is higher than for compositions without the addition of phenol. (average value for the first 235, and for the second 182 kgf / cM This confirms that replacing part of the resin with monomeric monomerim with phenol in the amount of 13-16% of the resin in the composition improves the strength properties of the compositions.

Example 14. Phenol-1 aldehyde resin SFY 3032 in an amount of 40.5 wt.% Is mixed with 7.1 wt.% Phenol and 47.6 wt.% NaC. A hardener (a mixture of 80% benzenesulfonic acid and 80% orthophosphoric acid in the ratio of 60:40) is introduced into the mixture with constant stirring in an amount of 4.8 weight. and poured e forms. cured at 100 ° C for 40 min. NpoNBasKH time 2 h.

Compressive strength of 180 kgf / cm.

PRI me R 15. Phenol-formaldehyde resin SFG 3032 in the amount of 33.3 wt.% Is mixed with 5 wt.% Phenol and 57.7 wt.% NaCI. 4% by weight of hardener according to Example 14 are introduced into the mixture with constant stirring. The curing mode of example 14.

Compressive strength of 160 kgf / cm.

PRI me R 16. Phenol-formaldehyde resin SFG 3032 in the amount of 20.7 wt.% Mixed with 3.7 wt.% Phenol and wt.% NaCl. 2.4% by weight of hardener according to Example 14 are introduced into the mixture with constant stirring. The curing mode of example 14.

Compressive strength of 70 kgf / cm.

Thus, the phenolic foams of the proposed composition are characterized in comparison with the known enhanced strength.

Table 1

Phenol content, wt.%

1.0 3.0

5.0 7.0

Note. The height of the pillar is above

Table 2

Time of passage of 1 liter of water, s, through the disk S 45 cm,

(Le 5 bfti

60.0 20.0 30.0 39.0 32.0 disk is 5 cm. Compressive strength, kgf / cm 130 180 120 Density, g / cm 0.66 0.66 0.52

. T a b l and c a 3

Table A 160 90 105 60.0 70.0 0.52 0.46 0.45 0.3 0.30

Claims (1)

The claims 40 A composition for producing a phenolic foam, including a rezol phenol-formaldehyde resin, an acidic hardener and a water-expandable filler, such as in order to obtain a high-strength breathable porous plastic, the composition further comprises phenol in the following ratio of components, wt.%: - fifty Resol phenol-formaldehyde resin 20.7-40.5 Acid hardener 2.4-4.8 Phenol 3.7-4.8 Washable Filler