RU2478671C1 - Polymer composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to preparation of polymer compositions based on epoxy resins and cycloaliphatic dioxides, which are meant for making large-sized articles from composite materials. The composition is based on a mixture of epoxy resins and products of epoxidation of 2-4-atomic alcohols in ratio of 99:1 to 1:99. The curing agent is a product of reaction of an acid (A) - a compound of general formula R₂-R₁-COOH, where R₁ is an aliphatic, cycloaliphatic, aromatic hydrocarbon or heterocyclic fragment, R₂ is a substitute - Cl, -F, -NH₂, -NH-, -OH, -CH=CH-, -CH=CH, amine (B) - di- or polyamine of an aliphatic, cycloaliphatic or aromatic type together with a polyatomic alcohol containing 2-6 hydroxyls in one molecule (C). Components in ratio A:B:C from 70:29:1 to 20:70:10 are mixed in a medium of a di- or tricarboxylic acid ether and a monoatomic alcohol at temperature of 20-80°C for 10-120 minutes. The obtained ternary reaction product is mixed with a eutectic mixture of aromatic amines in a ratio ranging from 5:95 to 95:5 and with lactone or lactam. The composition contains the following (pts.wt): resin part -100, curing agent - 20-100, lactone or lactam - 3-30.

EFFECT: invention enables to obtain a composition with a long working life, low peak temperature when curing, improved elastic and strength properties of the composition after exposure to temperature of 180°C.

2 tbl, 8 ex

Description

The invention relates to the field of producing polymer compositions based on epoxy resins and cycloaliphatic dioxides, intended for the manufacture of large-sized products from composite materials - for the chemical, electrical and other industries.

The closest prototype of the claimed invention is a family of polymer compositions based on a mixture of epoxy resins and epoxidation products of aliphatic 2-4 atomic alcohols using amines with salicylic acid as hardeners (see V.A. Lapitsky, A.A. Kritsuk. Physic mechanical properties of epoxy polymers and fiberglass, Kiev: Naukova Dumka, 1986, from 26 ÷ 27).

The disadvantage of such compositions is the low viability during processing, the high peak temperature of the exothermic reaction during curing in large masses of material, as well as the relatively low elastic-strength characteristics of the resulting products, limiting their use at high pressures.

The aim of the present invention is a polymer composition with high viability during processing and a lower peak temperature of the exothermic reaction in the curing process, providing an increase in the elastic-strength characteristics of the obtained polymers after exposure to a temperature of 180 ° C. This goal is achieved by the fact that the inventive composition based on a mixture of epoxy resins and epoxidation products of 2-4 atomic alcohols in a ratio of 99: 1 to 1:99 contains, as a hardener, a product obtained by reacting an acid (A) and an amine (B) together with a polyhydric alcohol with a hydroxyl content of from 2 to 6 in one molecule (C) in a ratio of A: B: C from 70: 29: 1 to 20:70:10 by mixing the components in a medium of di- or tricarboxylic acid ester and monohydric alcohol at temperature from 20 to 80 ° C for 10 to 120 minutes with used we use, as an acid, compounds of the general formula R ₂ —R ₁ —COOH, where R ₁ is an aliphatic, cycloaliphatic aromatic hydrocarbon or heterocyclic fragment, R ₂ is a substituent — Cl; —F, —NH ₂ , —NH—, —OH, —CH = CH—, —CH = CH ₂ , the di- or polyamine of an aliphatic, cycloaliphatic or aromatic type is used as an amine, and the resulting triple reaction product is combined with a eutectic mixture aromatic amines with a melting point from -10 ° C to 90 ° C with a reaction product: eutectic mixture of aromatic amines from 5:95 to 95: 5, and additionally with lactone or lactam, the composition contains in mass parts:

resin part - 100

hardener - 20 ÷ 100

lactone or lactam - 3 ÷ 30

Example 1

Obtaining hardener.

45 parts by weight are charged into a reactor equipped with heating, cooling and a stirrer. trans-4-aminomethyl-cyclohexane-1-carboxylic acid (A) containing a cycloaliphatic hydrocarbon fragment (R ₁ ) and a substituent — CH ₂ —NH ₂ , (R ₂ ) in its structure, after which 70 parts by weight of dibutyl ether are sequentially charged decandicarboxylic acid 55 parts by weight technical product - paraaminobenzylaniline (B) and 5 wt.h. glycerol (B) and at a temperature of 45 ° C is stirred for 65 minutes at a stirrer speed of 1000 rpm. To the thus obtained triple reaction product is added a eutectic mixture of aromatic amines metaphenylenediamine (MFDA) and 4.4 diaminodiphenylmethane (DADPM). MFDA ratio: 4.4 DADPM 60:40. The triple interaction product and the eutectic mixture are taken in a ratio of 50:50 and stirred at 45 ° C and 1000 rpm for 20 minutes.

Getting the composition.

In another reactor equipped with heating and a stirrer, 70 parts by weight of the epoxy diane resin ED-20 and 30 parts by weight of the epoxidation product of the trihydric alcohol-ethriol are loaded. Resin EET-1 with a content of 25% epoxy groups. The mixture is stirred at 70 ° C for 20 minutes at a speed of 60 revolutions per minute, after which 60 parts by weight of hardener are loaded 16 parts by weight of 16-hydroxyhexadecene-7-acid acid lactone (ambrettomide) 16 parts by weight of δ-valerolactam and at 70 ° C mix for 65 minutes.

Examples 2: 8 are carried out with the change of components and parameters in accordance with table 1.

The properties of the composition according to examples 1: 8 in comparison with the prototype are shown in table 2, the data of which confirm its advantages.

Claims (1)

A polymer composition based on a mixture of di- and polyepoxide resins and modifiers - epoxidation products of 2–4 atomic alcohols, characterized in that the resin and modifier are used in a ratio of 99: 1 to 1:99, and the product obtained by the interaction of acid is used as a hardener (A) and amine (B) together with a polyhydric alcohol with a hydroxyl content of from 2 to 6 in one molecule (C) in a ratio of A: B: C from 70: 29: 1 to 20:70:10 by mixing the components in ether di- or tricarboxylic acid and monohydric alcohol at a temperature of from 20 to 8 0 ° C for 10 to 120 minutes using compounds of the general formula R ₂ -R ₁ -COOH as an acid, where R ₁ is an aliphatic, cycloaliphatic, aromatic hydrocarbon or heterocyclic fragment, R ₂ is a substituent, Cl, -F, —NH ₂ , —NH—, —OH, —CH = CH—, —CH = CH ₂ , an aliphatic, cycloaliphatic or aromatic type di- or polyamine is used as an amine, and the resulting triple reaction product is combined with a eutectic mixture of aromatic amines with melting point from -10 ° С to + 90 ° С with the interaction product: euthe ratio cally mixture of aromatic amine is from 5:95 to 95: 5, and further added a lactone or lactam, wherein the composition comprises, in parts by weight .:
resin part one hundred hardener 20 ÷ 100 lactone or lactam 3 ÷ 30