SU523915A1 - Epoxy composition - Google Patents

Description

one

This invention relates to compositions of epoxy compositions for making models of building structures.

The known epoxy composition for the manufacture of models, including oligodienurethanedioepoxide (PDI-ZA), epoxy-ananiline resin (EA), amine hardener, mineral and porous filler (ed. St. USSR № 341820, C 08 45/00) This composition: provides models with Poisson's ratio and logarithmic decrement of oscillations, corresponding to the values for natural materials. However, the known composition does not provide the stability of the physicomechanical properties of the model material. In addition, the binder in the cured state has a high Poisson's ratio — more than 0.4, which requires the introduction of large amounts of porous filler, and this leads to an undesirable decrease in the specific weight of the material and the need to introduce a large amount of mineral fillers. Therefore, models of the scale from 1: 1000 to 1: ZOOO are obtained from such a composition.

The invention is a composition for making models on a smaller scale for testing at lower frequencies. This goal is achieved by the fact that, as an epoxy resin, the composition contains a mixture of epoxy resin Dianova (ED-5) and an epoxy diethylene glycol resin modified with fatty acids (DEG-W), in the following ratio of components (parts by weight):

Oligodurethanes from Opoxid2O-66

Epoxy Dianova resin6-22

Epoxy diethylene glycol resin modified with fatty acids 3-11 Amine hardener 2.5-6 Mineral filler 1О-300 Porous filler 2-7 After curing at room temperature for 15 days, the composition turns into a solid mass, which, depending on the ratio of the components, has the following -mechanical properties

you: elastic modulus (E) from 50 to 1OOO kgf / cm, Poisson's ratio (//) from 0.18 to 0.22, logarithmic decrement of oscillations 3} 0, 30–30, 35 values for natural materials such as concrete.

The nature of the dependence of strain on stress is closer to similar dependencies for natural materials than in the case of use as a binding SMSI-DI-ZA and EA resin.

The proposed composition allows to obtain a material with a higher density value, which in turn makes it possible to conduct tests on a smaller scale at lower frequencies.

Example 1. Model material is obtained by constantly mixing the components in the following sequence.

Oligodurethane epoxid of the mark PDI-ZA (TU-1037 9-71 VI No. 1) is mixed with

DEG-W epoxy thinner (MRTU-605-1191-69), then Diane epoxy with mole ED-5 (TU-P-17467) is added and, after thorough mixing at a constant temperature, polyethylene polyamine (PEPA) is added, the amount of which is According to the formula С ЭС-К, where Эс is the content of epoxy groups in the curable mixture, К is a constant, it is equal to 0.67. Then a mineral filler, quartz pulverized (Marshallite) (GOST 213851) or iron powder PZH-4M (GOST 98-49-61) is added. Phenol-formaldehyde microspheres (FF.M.) brand BV-01 (TU-6-05-221-258-73) are introduced last. After thorough mixing, the mixture is smeared with a spatula into molds, pre-lubricated with an anti-adhesive layer. Curing takes place at room temperature for 15 days.

The composition and properties of the model material from it are given in table. one.

Table 1

Continuation of table 1.

p is the specific weight.

Example 2. Model material is obtained in the same way as in Example 1, except that instead of phenol-formaldehyde microspheres, activated carbon with particles less than 0.3 mm in size is introduced.

The composition and properties of the model material from it are given in table. 2

Table 2 Example 3. Model material is obtained in the same way as in Example 1, but instead of phenol-formaldehyde microspheres cork crumb is introduced from a part of Continuation of Table 2.

Table 3 tsami size 0.5-1.5 mm. The composition and properties of the model material from it are given in table. 3

.)

Example 4. Model materialD ° 0.67 or a mixture of metgGfanilendiamiya

get in the same way as in the example- (MFDA) and triethanolamine (tea) with Apache 1, only instead of polyethylene polyamine; NI K 0.88.

PEVA) is used as a hardener. Composition and properties of the composition and model-.

diethylenetriamine (DEET) when

The proposed composition can be used for casting models in which individual elements are to be molded from materials with modulus of elasticity that is different, for example, dam models with bases at scales: 1: 20001: 5OOO. Casting lower scale models results in significant savings.

.1 Continued table. 3

| Of the material from it are given in Table. four.

Table 4

polymeric magrerials such as PDY-ZA and epoxy resins, to save labor costs, and most importantly, to use smaller castings with a smaller amount of epoxy resins, which improves working conditions for safety measures. The use of a lower modulus material allows the model to be tested with more low VI12

frequencies, which also improves working conditions on a smaller scale for testing

Yes. At lower frequencies, as a simulation of provisional resin, it contains a mixture of the most cost-effective and reliable epoxy and diethyl versions of building structures, for example, hydroelectric dams or TOB foundations for powerful) turbo aggregate components (in weight. h):

. , Oligodurethanediadepoxide 2O-66

FORUMA and 3 ABOUT AND Epoxy resin Dianova 6-22

Epoxy resin for the manufacture of epoxy diethylene glycol

models of building structures, inclusive-resin, modified oligodnurentidepoksid, epoxy acids 3-11

resin, amine hardener, mineral mine hardener 2.5-6

and porous fillers, distinguish-Mineral. filler 1O-300

w ith with the fact that, in order to obtain a m-porous filler 2-7

523915

glycol resin; modified with fatty acids, in the following ratio