SU1624005A1 - Process for preparing single-packing adhesive compositions - Google Patents

Abstract

The invention relates to the preparation of single-adhesive adhesive compositions suitable for express repair of defects on aluminum evaporators of refrigeration units in a public service system. The invention makes it possible to reduce the gas permeability of the repair material, to increase the reliability of its operation and to intensify reproduction by implementing a method for producing a single-packaging adhesive material, consisting in the fact that the carboxylate butadiene nitrile rubber is first mixed with polyoxyethylene ether. The mixture is dissolved in acetone to obtain a 15–20% solution, the powder components are mixed: epoxy-iditol oligomer, dicyandiamide, zinc diacetylacetonate, polyvinyl butyral, zinc oxide, bismuth hydroxide. The rubber solution is sprayed onto the obtained powder mixture through a die with a diameter of 0, 3-0.5 mm at a spray rate of 5-20 ml / min, after which the mixture is dried at 50 ° C for 5-10 minutes and the resulting melt is forced at 90 ° C through a die plate with a diameter of 0.7 cm. Moreover, the components are taken in the following ratio, mA.h .: eioxidolite oligomer 100, carboxylate butadiene nitrile rubber 4-6, polyoxyethylene ether 2.5-3, 5, dicyanediamide 3.5-5.0, zinc diacetylacetonate 4-b, polyvinyl butyral 0.5-1.5, zinc oxide 2.5-3.5, bismuth hydroxide 0.5-1.5. 3 tab. (L

Description

The invention relates to the production of one-pack adhesive compositions suitable for express repair of defects on aluminum evaporators of refrigeration units in a domestic service system.

The purpose of the invention is to reduce the gas permeability of the repair material, increase the reliability of its operation and intensify its production.

Example. An epoxy-yltiol oligomer (resin 6-ZI-60-1, TU 6-05-031- 493-76) is used as a base, which is a composition based on ED-16 resin and SF-0 phenol-formaldehyde resin, solid at 293 K 112. The content of epoxy groups is 8-10%, the content of phenol is 1%, the dropping temperature according to Uberlode is 349 K.

The hardener dicyandiamide DPDA (cyanoguanidine) (TU 6-09-3967-75) is a solid crystalline substance (mp 200-482 K) with a nitrogen content of bb, 7%.

cl

(PG 6-09- 1 peg guvo, rlstmodchfpkato-

Day I il l. silt i,: 09-127-78) - in,, -. u. .

B TIME B TOLCHO N P (

The liquid hydrocarbons used are SKN-18-1L carboxylate ohchadphenitrile rubber (, 0 T 3803121-75), the molecular weight Vin content of terminal carboxyl fluids is 3.1–3.2%, and polyoxyethylene ester (mp. 336-340 K) of the general formula CH (CH2) ,. 14-U) C2Hq) 7 (5-OH with a content of ethoxylated units according to Siju 7-15 mol and polyethylene likol 8.79%. As solid-flow modifiers, they use subivinylbutyral (GOST 9439-73) containing 43-48 % butyral groups and 3% acetal groups, acid number 0.12, zinc oxide (GOST 102-62-73) and bismuth hydroxide (TU 6-09-02-155-75), Modifying additives e - with an accelerating effect on the curing processes of the epoxy oligomer, perform the function of strengthening the polymer matrix.

Table 1 shows the composition and basic properties of the components obtained. The pre-crushed components are mixed for 0.5 in a ball mill in the following ratios of components, wt.h .: resin 6-EI-LO-1 100; dicannadiamide 3,5, diacetic zinc acetonate 5, zinc oxide 3, hydroxide bismuth 1, polyvinyl butyl coral 1. After stirring, the mixture is fed into a chamber, to which a 20% solution of carboxylate butadiene nitrile rubber is injected ( May 5, part) and polyoxyethylene ilether (3 parts by weight) acetone through a spray die with a diameter of 0.4 mm prt of a spray rate of 15 m / min.

The resulting mixture is dried for 5-10 minutes at 50 ° C, and then stirred and shaped into a rod by an automatic press through a spinneret with a diameter of 0.7 cm at 90 ° C.

The prepolymer thus obtained is applied to the defects preheated to 453-473 K or to the surfaces to be bonded by rubbing. Prepolymer curing south at 453-473 K for 1-3 minutes

The adhesive composition was tested for adhesive strength at separation (GOST 14769-69) with the help of explosive mashite of type WPM at 293 K. Standard figures are made of aluminum.

N-alloy type C-16AT, pre-degreased with gasoline, acetone and glued overlap under contact pressure at 453–473 K in temperature C1 1-3 min. Statistical processing of experimental results, according to ai et tonnage, gives a possible 1b variation coefficient.

Whether assessing the gas permeability of a composition is used with a diffusion cell. In the form of filler isgyugi. Uyug freon. The ratio of gas-penetration g ra gpnvayut formula

with a thickness of 1 and an area of F in time t, with a difference of ds, there is a reptile on both sides of the film (P | -P2). u (t is determined by the increase in gas pressure in an equal volume. Section 2 shows the properties of repair glued compounds prepared by the melt-mixing method (I) and and i by this method (1G).

In tab. 3 shows the data for optimizing the characteristics of this method of manufacturing repair adhesive

Claims (1)

material. ) Invention Formula The method of obtaining a single-package adhesive material by mixing carboxylate butadiene nitrile rubber, polyoxyethylene ether, epoxy-iditol oligomer, dicy- di-amide, zinc iacetylacetonate, polyvinyl butyral, zinc hydroxide and bismuth hydrochloride, followed by heating up zinc, bismuth hydroxyethonate, polyvinyl butyryl, zinc oxide and bismuth hydrochloride, acetylacetonate that, in order to reduce the gas permeability of the material, increase the reliability of its operation and intensify its production, first mix caroxylate butadiene-nitrile rubber to polioksietpleno- vym with ether, the mixture was dissolved in acetone to give a 15-20% solution is mixed powdered components: iditolny epoxy oligomer ditsi- andiamid, diatsetillaietonat zinc, polyvinyl butyral, zinc oxide, bismuth hydroxide, ragpy5162400 rubber solution are poured onto the resulting powder mixture through a die plate with a diameter of 0–3.5 mm at a spraying rate of 5–20 ml / min, after which the mixture is dried at 50 ° C for 5–10 minutes and the resulting melt is forced through 90 a diameter through 0.7 cm, and the components are taken in the following ratio ma.h.:. Q Epoxy-idol oligomer100 Carboxylate bu tadiennitrile rubber Dicyandiamide diamine ethyl zinc diacetylacetonate Polyvinyl butyral oxide Zinc bismuth hydroxide Kiastny Loss of the composition at its stage during poisoning in mixing equipment,% Variational coefficient of adhesion strength (due to uneven mixing of rubber),% Gas permeability, CMJ X M cm2 x x cm cm Hg 403-5 16-20 1.2-1.50.50-0.7 Table3