Ïëàñòìàññû, ïîëèìåðíûå è ñèíòåòè÷åñêèå ìàòåðèàëû, êàó÷óêè, ðåçèíî-òåõíè÷åñêèå èçäåëèÿ, øèíû è èõ ïðîèçâîäñòâî

 

D. Ch. Sc. Abdikarimov M.N.

 

Kazakh National Technical University named after K.I. Satpayev, Natural humanities institute named after al Mashani, department «Ñhemistry», Å-mail: mn.abdikarimov@mail.ru

 

The research of processes of pirolysis epoxies and siloksan monolithic covers with additions

 

It’s known about using different epoxies and siloksan covering as hermetics, glue and compositional materials in different areas of the technology [1-3].

Certain interest arouses the study of mechanism pirolysis and working characteristics of compositional materials on base of the epoxy resin ED-20, polypropylene (PP) and rubbers: epoxies PEF-3A and dimethilsiloxan SKTN-A. As additives the clay has studied. It contains 8 and 13% of oxides ferric (III). Additives sifted through strainer with diameter of holes 0,1mm. Mixture of components carefully mixed.

  The Initiating system was a dinitril azobys-izoacids (DAÀ) and peroxide of dikumil (PDK). The Compositions on base epoxies polymer were harden by polyetilenopolyamin (PEPA), siloksan compositions dietilcaprilat tin-hard K-18.

Thermogravimetric curves sample removed in flow of the inert gas at velocities of the heating 12,5 °/min, but thermo mechanic of the study conducted on sample by diameter  6 0,1 mm and thickness 2 we on air at load 10 kg/mm2. Struñturå polymeric composition studied on electronic microscope EVM-100-LM on method of the carbon remarks. Thermogravimethric ñurves different sample is presented on figure 1. As it is seen, the temperature begin decompositions polymeric composition on base of the epoxy ED-20 and epoxies rubber PEF-3A begins under 305 °Ñ. The Additives of the clay and rubber mite do not influence upon mechanism pyrolysis epoxies composition, peroxide dikumil promotes the offset of the move of the crooked temperature in area on 50-70 Ñ at the average. The Losses of the mass sample under 400 °Ñ 16-40 % forms for different composition 73-78 % reach under 800 °Ñ, but compositions, containing mainly epoxies rubber PEF-3A with accompaniment ED-20, have a loss of the mass 85-88 %.

Thermogravimetric curves were taken of on constructed plant in rare gas stream with 12.5 º/min speed of heating.

Thermogravimetric curves of SKN-40 decomposition with different additions are represented on 1st and 2d figures

The Temperature begin decompositions of silks composition, including epoxies rubber PEF-3A; harder and sand, forms 390 °Ñ, under 600 °Ñ loss of the mass sample is 19-22 %, under 800 Ñ - 71-76 %.

On figure 2 brought results thermomechanic test epoxies composition. From drawing follows that sticky resilient characteristic of epoxies polymer increase with introduction to composition of polypropylene (the curve 2), conditioning growth characteristic high elastic under additional contents rubber (the curve 3). High resilience to epoxies composition   3 reveals itself before the temperature 330 °Ñ, when sample begins the flow. Probably, polypropylen and peroxide of decimal interact with epoxygroops of the resin and rubber and form sew net.

 

 

 

The figure 1. Thermogravimetric curves sample: Vwarm = 12,5 °/mines in flow of the argon, V – velocity.

 

Cipher Composition (Weigh station part):

1.       18      Epoxy ED-20 100 

                  PEPA 10

                  The Clay 1 (13 % - Fe2Î3) 20

                  The Peroxide 2

2.       19      Epoxy ED-20 100

Clay  2 (8 % - Fe2Î3) 20 

                  The Rubber mite 20 

                  PEPA 10 .

3.       29      Epoxy ED-20 25 

                  PEF-3A 100 

                  PEPA 2,5 

                  The Rubber mite 40,7

4        51      SKTN--À 100 

                  K-18 10 

                  PEF-3A 10 

5        52      SKTN--À 100 

                  K-18 10 

                  PEF-3A 10 

                  Sand 20

 

 

 

 

The figure 2. Thermomechanical curves sample epoxy with additive:

  Cipher Composition (Weigh station part). ε – deformation.

1        18      Epoxy ED-20 100 

                  PEPA 10 

                  The Clay  1(13 % Fe2Î3) 20 

                  The Peroxide dikumil 2 

2.       23      Epoxy ED-20 100 

                  Dinitrilazobisizooil acid 2

                  The Rubber mite 10 

                  Polypropylene 20 

                  PEPA 10 

3        25      Epoxy ED-20 100 

                  PEF-3A 10 

                  The Clay   2 (8 % Fe2Î3) 4 

                  Polypropylene 10 

                  PEPA 10 

 

Electronic-microscopic studies is installed appearance in the area of crystalloid of epoxide composition, having originally amorphous phase at accompaniment of the clay, ïîëèïðîïèëåíà and PEF-3A, and formation completely çàêðèñòàëëèçîâàííûõ structures at introduction to epoxies composition of the clay and PDK. It Is Shown that diameter of the times syloksan composition, having in composition rubber PEF-3A and harder K-I8, is changed within- 22500-45000 Jc. The Accompaniment of sand promotes the reduction a diameter times within 13000-22500 But.

On the grounds of called on studies possible to do the following findings:

1. The Peroxide of dikumil displaces the move crooked in area of the low temperature on 50-70 Ñ.

2. The Additives polypropylene and epoxies rubber promote increase an sticky elastic characteristic to epoxies composition in broad interval of the temperature.

3. Sand conditions the reduction of the diameter of the times syloksan composition.

                 

       LITERATURE:

1. Fedukin D.L, Mahlin F.A  Techno- and technical properties of rubbers. M., Chemistry, 1985/240 p.

2. Radchenko I.I. The Encyclopedia of polymers M.:  Counsil Encyclopedia,1972/T.I.   - P. 310-322.

3. Dogadkin B.A., Doncov A.A., Shershnev V.A The chemistry of elastomers. M.: Chemistry, 1981, 376 p.