SU492523A1 - Polymer composition - Google Patents

Description

 The invention relates to thermostabilized compositions based on poly j pa 3,3-bis- (chloromethyl) -oxCaiclobutane (pentaplast). , The known heat stabilized pentaplast-based composition, which includes conjugated oligomeric products as a stabilizer. from the class of amines. Oligomeric antioxidants possess high heat resistance, low volatility and good compatibility with penta; formation, however, their stabilizing efficiency is insufficient in some cases. For example, to obtain coatings using the vortex method, a higher thermal stability is required. The proposed composition is characterized in that in order to increase the thermal stability of the composition, 2- (phenyl-p; aminophenoxymethyl) -2-nor-1.3 (epoxypropane) of the formula Hosn-src. (. Conditionally named EST-3 (m.p.83-84 ° C), This compound is obtained from j cheap and available raw materials: 3,3-bis-chloromethyl oxacylobutane-monomer pentaplast and 1-tg-oxydiphenylamine, synthesis of stabilizer EST-3 simple, it is carried out with an excess of the first compound I at 11 ° -146 ° C for 1.5 hours. ECT-3: is a powder product, therefore its introduction into the foam taplast can be; established, for example, in an Aiger or Henschel high-speed mixer, the proposed stabilizer should be introduced into the pentaplast in an amount of 0.005-0.01 g of MoGy / kg. Antioxidant additive EST-3 concept 0.01 g. mol / kg ensures the preservation of the composition viscosity given, for 8 hours aging at 190 ° C at 88%, in

while using oligomeric. stabilizers in a specified concentration. retains the reduced viscosity of the composition at the same time by 80%.,

It should be noted that the curve of the dependence of the inhibitory activity of an amnn type stabilizer on their concentration passes through a maximum, which, for example, in a composition based on pentaplast and stabilizer is 0.005 ppm / kg. Therefore, when using ECT-3 with a concentration of 0.005 g mol / kg providing; the greatest stabilizing effect; the composition with the addition of 0.005 g. mol / kg for 8 hours retains the reduced viscosity by 96%. The content of ECT-3 is less than 0.005 g mol / kg is not enough to stabilize the pentaplast, and an increase in concentration to 0.01 g is mol / kg and above leads to the initiation of the oxide process and a decrease in the stabilization effect. Examples 1-10. A pentaplast-based composition is prepared in which ECT-3 is used as a heat stabilizer. The stabilizer is introduced into the deposited polymer in an amount of 0.0025-0.01 g. Mol / kg. For comparison, oligomeric stabilizers are added at the same concentration. A portion of the powder (irj of the composition obtained is placed on a glass substrate 100 microns thick and located in a thermostat at 190 ° C at different times. The concentration of stabilizers, as well as the change in the reduced viscosity and weight of the composition represent Lena in the table.

ECT-3

Oligomer poly- o (,

C-bis-benzal {il-aminophenyl) anyl

0, O1

100

1OO

About 2 4

, 84 99.7 96 99.3 92

99.5

88

6,100 92

100 99.3

ABOUT

, 68

four

b 8

88 99.1 80

99.0

{veoboretenv formula

Polymer composite based on c, 3-6is (chloromethyl) -buxan and clobutan n stabilizer, characterized by

Table continuation

| tvm that, in order to increase the stability of the composition (. | t of the composition, as a stabilizer, it contains 2- (phenyl-4-aminof "noximetnl) -2-chloromethyl-1,3-epoxy" {yupan with a concentration of 0.005-0.01 g "mol / kg.