Epoxy composition for coating

FIELD: chemistry.

SUBSTANCE: epoxy composition is intended for obtaining anti-corrosion coatings on products and reservoirs from concrete, reinforced concrete, metallic constructions. Composition includes following components, with their ratio, wt %: 47.4-54.4 of epoxy-diane resin ED-20, 2.8-4.3 of modifier, 19.6-27.0 of solvent, 21.7-22.8 of amine hardener. As modifier composition contains polyisocyanate based on 4,4'-diphenylmethandiisocyanate. As solvent composition contains solvent R-4. As hardener composition contains aromatic polyamine "Aramine".

EFFECT: increase of water-resistance and resistance of composition to impact of acids and alkalis.

2 tbl, 4 ex

 

The invention relates to the production of film-forming apoximately coatings cold drying and can be used as a protective anti-corrosion coatings for concrete products, concrete, metal structures.

The most important indicators of the polymeric composition, determining for each of the specific conditions of the operational parameters of the coating and its service life (durability) in accordance with GOST R 51164-98 "steel pipe mains. General requirements for corrosion protection", are high physical-mechanical properties, especially tensile strength, adhesion, resistance to aggressive media, water resistance and low water absorption of the film.

Known polymer composition for coating comprising polypropyleneoxide, epoxy Dianova resin and amine hardener by A.S. 899599, IPC C09L 63/00, C09D 3/58. A disadvantage of the known compositions is that the coating on its basis does not have a sufficiently high resistance to water and chemical resistance to acids and bases.

Known composition described in SU 920059 A1, 15.04.1982, for coating printed circuit boards based on alkyd epoxy resin and hardener MDI grade B based on 4,4'-diphenylmethanediisocyanate. The disadvantage of the composition is a low maintenance gel-f the shares (up to 92%), that indicates a lack of completeness of cure and, as a consequence, the relatively low adhesion to the substrate (2 points).

Closest to the technical nature undertaken by the authors for the prototype is the composition of the patent of the Russian Federation No. 2219211, IPC C09D 163/02, publ. 20.12.2003, coating, containing epoxygenase resin, apoximately oligomer, solvent, polyethylsiloxane the liquid and the amine curing agent is a product of the interaction of γ-aminopropyltriethoxysilane and diphenylsilanediol.

The disadvantage of the compositions are relatively low level of water resistance, durability in the environment of petroleum products and more concentrated solutions of acids and alkalis.

The technical task of the present invention is to provide a polymeric composition that ensures a long working life of the protected structures in aggressive environments: in acid solution (sulfuric concentration to 50%, nitrogen concentration up to 30%, salt), alkalis, petroleum products.

The technical problem is solved due to the fact that the polymer composition for anti-corrosion coatings, including epoxy Dianova resin ED-20, modifier, an amine hardener and solvent R-4, as a modifier contains a polyisocyanate based on 4,4'-diphenylmethanediisocyanate, and as a hardener aromatic polyamine under the trademark "Ar is min" in the following ratio of components, wt.%:

Epoxy Dianova resin ED-2047,4-54,4
The polyisocyanate2,8-4,3
The solvent R-419,6-27,0
Aromatic polyamine "Aramina"of 21.7 and 22.8

Modification of epoxy compositions occurs when the interaction of the isocyanate groups of MDI with hydroxyl groups of the epoxy resin with the formation of urethane groups. When modifications due to bridging ties converts bifunctional epoxy resin in tetrafunctional, then cured aromatic polyamines "Her". This leads to increased strength, adhesion, teplostoykost and corrosion characteristics of the coating.

The coatings are produced in two stages. In the first stage, carried out the modification of epoxy resin ED-20, mixed with polyisocyanate. After heating at 80-90°C for three hours, it is cooled to 40-50°C, dilute to desired consistency solvent R-4 and Packed in containers. The composition is characterized and complete the required amount of hardener "Her".

In the second stage directly re the use in the composition of the injected compound.

The modified composition is cured for 24 hours at room temperature, 4 hours at 80°C, 2.5 hours at 100°C. the Durability of the mixture with curing agent at room temperature is 2.5-3.0 hours. To ensure the reliability of chemical protection apply 3-5 layers of composition.

The composition may further contain fillers, such as aluminum or zinc powder, talc.

In the claimed composition uses the following components:

Epoxy Dianova resin ED-20GOST 10587-84
The polyisocyanate (PIZ)THE 113-03-38-106-90
The solvent R-4
(a blend of acetone, toluene, butyl acetate)GOST 7827-74
Aromatic polyamine "Aramina"THE 2415-164-05786904-02

Used for curing the composition of the hardener of epoxy resins "Her" TU 2415-164-0578904-02 is a modified aromatic polyamine. Technical conditions TU 2415-164-0578904-02 "hardener of epoxy resins "Her" are publicly available source, as entered in the register 12.02.02, No. 200 /036879 Unintended GOTANDA IS THAT Russia (the stamp on the title page THAT). Catalogue sheet product information can be requested and obtained by any interested person.

According to the link to the list of standards and specifications used in THE 2415-164-0578904-02, as the object of modification is an aromatic polyamine (mixture of isomers) TU 6-14-836-86, representing a mixture of isomers of diaminodiphenylmethane, predominantly 4,4'-diaminodiphenylmethane (60-95%) [Vasaputi, AIU "Physico-mechanical properties of epoxy polymers and reinforced plastics". Kiev, Naukova Dumka, 1986, s-23].

The content of the hardener "Her" was calculated based on the stoichiometric ratio of the reactive groups of the resin ED-20 and "she".

The invention is illustrated by the following examples of specific performance.

Example 1. In a reactor equipped with a mechanical stirrer, heating, consistently load 50 Dianov g epoxy resin ED-20 and 2.0 g of modifier MDI. The temperature in the reactor support 80-90°C. the Mixture is stirred for 3.0 to 3.5 hours until the disappearance of the IR spectrum of the mixture of the strip 2220 cm-1(NCO group). Then the modified resin is cooled to 40-50°C, mixed with 28 g of solvent R-4 for 10-15 minutes In the resulting varnish solution before use enter 20 g of aromatic polyamine "Her", stirred at 20-25°C for 5 min is t and is applied with a brush to the substrate. Composition utverjdayut at an ambient temperature of 18-22°C for 24 hours.

Examples 2-4. Composition grewat analogously to example 1 with the ratios shown in table 1.

Properties of the compositions investigated in laboratory conditions FSUE December.

Adhesive strength to metal and concrete substrate were determined according to GOST 15140-78 "Materials paint. Methods for the determination of adhesion".

The relative hardness of the film is determined according to GOST 5233-89 "Materials paint. Method for determination of hardness by pendulum device".

Chemical resistance of the coating is determined according to GOST 9.030-74 "Rubber. Test methods for resistance in the relaxed condition to the effects of liquid aggressive media".

Water absorption of the coating is determined according to GOST 4650-80 "Plastic. Methods for determination of water absorption".

Composition and properties of the compositions shown in tables 1 and 2.

4
Table 1
The compositions
Name of the componentThe content of components according to the examples, wt.%
The placeholder123
Epoxy Dianova resin ED-2028-3550,047,454,449,5
Apoximately oligomer10-15----
The polyisocyanate-2,02,84,35,0
Solvent24,5-30,6----
The solvent R-4-28,027,019,625,7
Polyethylsiloxane liquid0,1-0,5----
Silicone diamine24,3-33,0 ----
Aromatic polyamine "Aramina"-20,022,821,719,8

Table 2
Properties of composition
IndicesExamples
The placeholder1234
Relative hardness, usledof 0.41 to 0.630,570,610,64a sample of the foam during polymerization
The adhesion score1111-
Water absorption, %0,140,120,13-
Resistance to aggressive media, a day without changes:
- distilled water50506060-
- H2SO410%-50606060-
50%-506060-
-NaOH10%50606060-
50%- 506060-
NaCl10%50506060-
-HCl36%-506060-
-HNO330%-506060-
- nefras-606060-
*) Reproduced by the authors.

From the data presented in table 2, it is seen that in the modification of epoxy Dianova resin ED-20 polyisocyanate based on 4,4'-diphenylmethanediisocyanate cured aromatic polyamines "Aramina" polymer composition (example 2 and 3) have lower values vadopalas the tion, higher resistance to aggressive media, higher relative hardness, in comparison with the known, which indicates the efficiency of the protective properties and service life of the coating.

Epoxy resin composition for coatings, including epoxy Dianova resin ED-20, modifier epoxy resin, solvent and amine curing agent, characterized in that as a modifier contains a polyisocyanate based on 4,4'-diphenylmethanediisocyanate, as solvent - solvent R-4, as a hardener is an aromatic polyamine "Her" in the following ratio, wt.%:

Epoxy Dianova resin ED-2047,4-54,4
The above polyisocyanate2,8-4,3
The solvent R-419,6-27,0
Aromatic polyamine "Aramina"of 21.7 and 22.8



 

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Coating composition // 2335521

FIELD: chemistry.

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2 tbl, 1 dwg

Lacquer composition // 2314328

FIELD: varnish-and-paint industry.

SUBSTANCE: invention relates to lacquer composition useful in surface, undersurface, and hydroengineering construction, e.g. to protect steel, concrete, and reinforced concrete surfaces. Composition consists of base including 40-70% epoxide dian resin modified with coal-tar resin, preferably with liptobiolytic resin preliminarily stabilized with hexamethylenetetramine, pigments, water-soluble solvent having solvation capacity not lesser than that of water in amount of 10-30% of the weight of base, and amine-type hardener. Pigments are selected from red lead, carbon white, and aluminum powder. If necessary, composition further contains talk and/or quartz sand as extender in amounts up to 30% of the weight of base.

EFFECT: increased resistance against acids, alkalis, and sea water.

3 tbl, 17 ex

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EFFECT: improved and valuable properties of composition.

2 tbl, 6 ex

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3 cl, 2 tbl, 5 ex

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EFFECT: composition with high adhesion to concrete and metal surface and improved strength.

2 tbl

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