RU2277561C1 - Polymer composition - Google Patents

Abstract

FIELD: polymer materials.

SUBSTANCE: invention concerns polymer composition providing reliability and long period of running repaired sections of pipelines comparable to those in defectless pipelines. Composition is constituted by, wt parts: epoxide dian resin 100; aliphatic epoxide resin 35-75; oligoether-cyclocarbonates with weight portion of cyclocarbonate groups 18 to 29, 5-40; powder filler 40-200, amine hardener 55-90, and plasticizer 7-30, said powder filler being a mixture of mineral silicate-containing powders with metallic powders at ratio between 100:4 and 100:20 and said amine hardener being a mixture of (A) and (E) products at ratio between 80:20 and 60:40. Product (A) is prepared by reacting amine (B) with salicylic acid (B) and plasticizer (D), which is oxygen-containing compound from polyol group, weight ratio (B):(C):(D) ranging from 72:1.5:26.5 to 40;9;51. Product (E) is prepared via condensation of phenol, formaldehyde, and aliphatic amine. Invention improves physico-mechanical properties of polymer composition cured at temperatures 4-5°C and 20°C such as bend strength, tensile strength, and elongation, increases adhesion for steel, reduces shrinkage, viscosity, and temperature of exothermic reaction, and also increases time of the beginning of exothermic reaction.

EFFECT: improved performance characteristics of polymer composition.

2 tbl, 9 ex

Description

The invention relates to polymeric compositions based on epoxy resins and is mainly intended for repair in damaged conditions of damaged sections of gas and oil pipelines using detachable metal couplings without interrupting the product transportation process, as well as for filling, sealing compounds in electrical engineering, construction industry and other purposes.

The modern level of technology allows in a short time and without stopping the transportation of products to strengthen the detected defective sections of pipelines, previously temporarily lowering the pressure of the transported medium.

Polymer compositions for repair compounds, which fill the annular space (the gap between the inner diameter of the metal sleeve and the outer diameter of the pipeline), must have not only high performance properties over a long service life, but also ensure the manufacturability and safety of the processes of their preparation and use.

In this regard, the most important indicators of the polymer composition are its high physical and mechanical properties, adhesion to metal, and the practical absence of shrinkage not only after the final curing of the repair composition (after 5-7 days), but after 1-2 days, which allows you to quickly recover reduced pressure of the transported medium. In addition, the viscosity of the composition, the time to the start of the exothermic reaction and the peak temperature of the exothermic reaction are extremely important indicators of a stable and safe repair process.

Known epoxy composition (US Pat. RF No. 2186077, class C 08 L 63/02 of 2002), comprising an epoxy diane resin, a modifier is a mixture of polyoxychloropropylene triepoxide or polyoxypropylene diepoxide, amine hardener and carbon black.

The disadvantages of this composition are the relatively low physical and mechanical properties, high shrinkage, a short time before the start of the exothermic reaction, and a high peak temperature of the exothermic reaction.

Known polymer composition (AS RF No. 1719411, class C 08 L 63/00 dated 03/15/92), including an epoxy resin, a modifier - epoxidized wastes of hydroxypropylene glycol, oligoesterpoxide, amine-containing hardener and λ-phenylnaphthalamine-1.

The disadvantages of this composition are high shrinkage, significant instability of the properties due to the use of raw waste in its manufacture, as well as a short time before self-heating and the high temperature of the exothermic reaction.

Known polymer composition is a sealant (AS RF No. 1199784, class C 09 K 3/10 dated 12/23/85), including an epoxy resin, a modifier - polyoxypropylene triol tricyclocarbonate, carbon black, aerosil, amine hardener.

The disadvantages of this technical solution are low physical and mechanical properties.

The closest technical solution to the proposed one is a polymer composition (US Pat. RF No. 2186802, class C 08 L 63/00 dated 08/10/2002), including a mixture of epoxy diane and aliphatic resins, a powder filler and an amine hardener - a mixture of Mannich base and Schiff base .

The disadvantages of this composition are the relatively low rates of physical and mechanical properties, adhesion to steel, high rates of shrinkage, as well as a short time before the start of the exothermic reaction and the high temperature of the exothermic reaction.

The objective of the present invention is to provide a polymer composition that ensures the reliability and duration of operation of the repaired pipeline sections, comparable with those for defect-free pipelines, as well as the manufacturability and safety of the mechanized filling of the annulus (gap between the pipe and the coupling) during the repair of the defective pipe.

The technical result from the use of the invention is to increase the physicomechanical properties of the polymer composition, cured at temperatures of 4-5 ° C and 20 ° C (bending, compressing, tensile strength, elongation under tension), adhesion to steel, and also to reduce shrinkage, viscosity, temperature of the exothermic reaction and increasing the start time of the exothermic reaction.

This result is achieved in that the polymer composition for repairing pipelines, comprising a mixture of epoxy diane and aliphatic resins, a powder filler and an amine hardener, as a powder filler contains a mixture of mineral silicate-containing powders with metal in a ratio of from 100: 4 to 100: 20, as amine hardener - a mixture of product (A) obtained by the interaction of an aromatic amine (B), salicylic acid (C) and a plasticizer, which is an oxygen-containing compound from group p Liols (G), with a ratio of B: C: G from 72: 1.5: 26.5 to 40: 9: 51 and the condensation product of phenol, formaldehyde and an aliphatic amine (D) with a ratio of A: D from 80:20 to 60:40 and additionally products from the class of oligoestercyclocarbonates with a mass fraction of cyclocarbonate groups from 18 to 29 and the above plasticizer in the following components, wt.h .:

Epoxy Dianova Resin one hundred Epoxy Aliphatic Resin 35-75 The above oligoestercyclocarbonates 5-40 The above powder filler 40-200 The above amine hardener 55-90 The above plasticizer 7-30

The invention is illustrated by examples.

Example 1

In a reactor equipped with a mechanical stirrer, heating and cooling, 100 wt.h. preheated to 60-70 ° C epoxy dianovoy resin brand ED-20 (GOST 10587-90), 60 wt.h. diethylene glycol diglycidyl ether (technical product DEG-1 TU 2225-027-002203306-97), 20 parts by weight tricyclic carbonate oligooxypropylene triol with a content of cyclocarbonate groups 18 (technical product Laprolate 803 TU 2226-303-10488057-94), 3 parts by weight octoxypropylene glycol monocyclocarbonate with a content of cyclocarbonate groups 29 (technical product Laprolate 301 TU 2226-303-10488057-94), 13 parts by weight plasticizer - a mixture of dioxane alcohols and their high boiling ethers (technical product "Plasticizer EDOS" GOST 2493-003-13004749-93), 96 wt.h. enriched kaolin of KE-1 grade (TU 5729-070-00284530-96), 8 parts by weight iron powder ПЖВ-5 (GOST 9849-86) and 3 parts by weight aluminum powder powder (GOST 5494-95).

The mixture of components introduced into the reactor is stirred for 25-30 minutes until a homogeneous gray color is obtained, after which the resulting product, which is the resinous part of the polymer composition, is poured from the reactor into a sealed container (buckets with a sealed lid) and stored in storage conditions for 1 year

In a similar reactor, a hardener is prepared: 60 parts by weight are charged with constant stirring. pre-molten aromatic amine brand "Polyamine-B" (TU 113-38-67-90) (B), 5 wt.h. salicylic acid (GOST 627-70) (B), previously dissolved at 75 ° C in 35 parts by weight plasticizer - a mixture of dioxane alcohols and their high-boiling esters of the EDOS Plasticizer brand (GOST 2493-003-13004749-93) (G) with a component ratio B: C: G equal to 60: 5: 35, the mixture is heat treated at a temperature of 75-80 ° C for 20 min, then the resulting reaction product (A) is cooled to a temperature of 30 ° C and mixed with the condensation product of phenol, formaldehyde and an aliphatic amine - ethylenediamine (technical product of the AF-2 brand TU 2494-511-00203521-94 ) (D) at a ratio of 75:25, the mixture is stirred for 12-15 minutes and the hardener obtained in this way t in metal containers - buckets with tight lids, which are stored in warehouse conditions within 1 year.

The resin part of the polymer composition and hardener are supplied to the consumer as a whole.

The mixture of the resin part and the hardener is carried out immediately before use according to example 1 by stirring 290 parts by weight resin part and 75 parts by weight hardener in a container with a mixer for 5 minutes, followed by pumping the finished polymer composition with a pump into the annulus.

The manufacture of the composition according to examples 2-5 is carried out analogously to example 1, but with the ratio of the components listed in table 1.

The properties of the polymer composition in comparison with the known technical solution are presented in table 2.

As can be seen from table 2, the proposed polymer composition has significantly higher performance properties in comparison with the known, namely increased indicators:

Bending strength 1.2-1.5 times under compression 1.5-2.2 times tensile 1.6-2.3 times Elongation 1.7-2.1 times Adhesion to steel 1.3-1.7 times Time before the start of the exothermic reaction 2-2.5 times

Reduced:

Shrinkage 5-10 times Exothermic Reaction Temperature 1.4-1.7 times Viscosity up to 2.5 times

The totality of the achieved indicators of the proposed polymer composition allows you to organize a stable technologically safe process of repairing damaged sections of oil and gas pipelines in route conditions, which will ensure the quality and service life of the repaired sections, comparable to those for defect-free sections of pipelines.

In addition, the higher physical and mechanical properties of the polymer composition after 1-2 days of curing make it possible to restore the mode of transportation after 2 days and, therefore, reduce the economic losses due to a decrease in the intensity of product transportation.

Claims (1)

A polymer composition for repairing pipelines, comprising a mixture of epoxy diane and aliphatic resins, a powder filler and an amine hardener, characterized in that the composition contains a mixture of mineral silicate-containing powders with metal in a ratio of 100: 4 to 100: 20 as an amine powder hardener - a mixture of product (A) obtained by reacting an aromatic amine (B), salicylic acid (C) and a plasticizer, which is an oxygen-containing compound from the group poly tin (G), with a ratio of B: C: G from 72: 1.5: 26.5 to 40: 9: 51 and the condensation product of phenol, formaldehyde and an aliphatic amine (D) with a ratio of A: D from 80:20 to 60:40 and additionally oligoestercyclocarbonate with a mass fraction of cyclocarbonate groups from 18 to 29 and the above plasticizer in the following components, wt.h .: Epoxy Dianova Resin one hundred Epoxy Aliphatic Resin 35-75 The above oligoestercyclocarbonates 5-40 The above powder filler 40-200 The above amine hardener 55-90 The above plasticizer 7-30