RU2741989C1 - Acid-and-alkali polymer composition for protection of equipment and building structures - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to polymer materials for protecting equipment and building structures from aggressive media, such as acids, alkali, and high temperatures. Described is acid and alkali resistant polymer composition of filler paste for protection of equipment and building structures. Composition contains as a polymer base phenol-formaldehyde resin of resol type, as well as powder mixture consisting of a combination of talc, kaolin, industrial carbon and hardener, with the following ratio of components in wt. %: kaolin 8–25, talc 41–72, technical carbon 1–7, curing agent 14–34. Volume ratio of phenol-formaldehyde resin and powder mixture is 1:2.

EFFECT: technical result is providing putty with an acid resistance of not less than 90 %, alkali resistance of not less than 90 %, heat resistance of not less than 180 °C.

1 cl, 1 tbl

Description

The present invention relates to polymeric materials for protecting equipment and building structures from the effects of aggressive media such as acids, alkalis, and elevated temperatures.

From the existing prior art, a composition is known containing an epoxy resin, a modifier, a hardener, and a mineral filler in the following proportions: epoxy dianic resin 100 parts by weight, shale phenolamine modifier: 80-120 parts by weight, polyethylene polyamine hardener 5-10 parts by weight. including, acid-resistant mineral filler: 100-440 parts by weight, fine graphite: 150-200 parts by weight, aluminum powder: 5-15 parts by weight. [USSR patent SU1086002A, publ. 04/15/1984 Polymer putty. IPC C09J3 / 16. Application 3498191 from 11.10.1982]. This composition is not alkali-resistant and heat-resistant. The combined use of finely dispersed graphite and aluminum powder reduces the initial strength characteristics. In addition, the composition contains expensive ingredients.

Known composition for lining digesters, tanks for storing aggressive liquids, their repair [USSR patent SU438285 publ. 12/05/1976 Polymer putty. IPC С08L61 / 02. Application 1641882 / 23-5 dated 06.04.1971], containing furan resin 30-32%, which includes: 30-40% difurfurylideneacetone (DPA), 40-50% furfural, 15-20% oligomers of DPA and furfural (resinous part), as well as andesite flour 100% and as a hardener - benzenesulfonic acid 7.5-8.0%. The disadvantages of this composition are the lack of elasticity - high fragility, the ability to obtain a product only black, high shrinkage, creep. Also, furan resins are toxic products.

Closest to the claimed technical solution is [USSR patent SU104211, publ. 01.01.1956, Method of obtaining chemically resistant and heat-conducting putty hardening in the cold. IPC C09D161 / 06, C08K5 / 42. Application: 453221 dated February 24, 1955], which provides the composition of the putty for lining production equipment and casting shaped articles of complex configuration: cranes, rotors, centrifugal pumps, etc. The composition is obtained on the basis of compositions containing 32 ÷ 52% phenol-formaldehyde, resorcinophenol-formaldehyde and cresol-formaldehyde resins, 56% graphite filler and 12% parachlorobenzenesulfonic acid.

The task to be solved by the claimed invention is to create an acid-alkali-resistant and heat-resistant polymer putty:

- with an acid resistance index of at least 90.0% (in relation to concentrated (38%) hydrochloric acid - GOST 12020-72);

- with an alkali resistance index of at least 90.0% (in relation to a 10% sodium hydroxide solution - GOST 12020-72);

- with increased heat resistance not lower than 180 ° С;

- with an increased pot life of the mixture at 20 ° C.

This problem is solved due to the fact that an acid-alkali-resistant polymer composition for protecting equipment and building structures from aggressive media includes a phenol-formaldehyde resin of the resole type as a polymer base, as well as a powder mixture consisting of a combination of talc, kaolin, carbon black and a hardener, when the following ratio of components in wt. %:

kaolin 7 ÷ 28%; talc 41 ÷ 73%; carbon black 1 ÷ 7%; hardener 14 ÷ 36%;

and with a volume ratio of phenol-formaldehyde resin and powder mixture of 0.5 to 1.

Resins SFZh-3013, SFZh-3014 and SFZh-3024 can be used as phenol-formaldehyde resin of the resole type, and toluenesulfonic acid, paratoluenesulfonic acid, benzosulfonic acid, etc. can be used as a hardener.

The viscosity of the composition is controlled by using different ratios between the polymer base and the powder mixture. The required viscosity is determined by the technological operation performed. For Arzamit-5, the ratio of resin: powder mixture is 1 to 1 or 0.8 to 1, respectively. For the proposed composition, the optimal ratio of resin and powder mixture is 0.5 to 1, respectively.

The advantage of the proposed technical solution is the increased viability of the mixture at 20 ° C, heat resistance (180 ÷ 185 ° C), acid resistance (90 ÷ 95%), alkali resistance (90 ÷ 95%). Comparison according to the declared indicators of this technical solution with the Arzamit-5 putty is presented in the table.

Table. Comparison of indicators of the proposed technical solution with Arzamit-5 putty

Ratio of polymer base and powder mixture Acid resistance,% Alkali resistance,% Heat resistance, ° С * Suggested composition 0.5: 1 92 93 183 Arzamit-5 0.8: 1 97 0 132 1: 1 98 0 148

* The temperature of loss of 1% of the mass was taken as an indicator of heat resistance

Claims (3)

An acid-alkali-resistant polymer composition of putty for protecting equipment and building structures, including a phenol-formaldehyde resin of the resole type as a polymer base, as well as a powder mixture consisting of a combination of talc, kaolin, carbon black and a hardener, with the following ratio of components in wt. %: kaolin 8 - 25 talc 41 - 72 carbon black 1 - 7 hardener 14 - 34 and with a volume ratio of phenol-formaldehyde resin and powder mixture of 1: 2.