SU730738A1 - Polymeric composition - Google Patents

Description

I

The invention relates to polymeric materials, namely, stabilized polymer compositions based on a copolymer of ethylene with vinyl acetate, and can be used to obtain compositions having improved performance characteristics and increased resistance to thermal-oxidative degradation.

A stabilized polymer composition is known, containing a copolymer of ethylene and vinyl acetate and, as a heat stabilizer, a synergistic mixture of irganox and oxy-di-p-phenylamide di-phosphate.

However, the additives in stabilizers for ethylene copolymer with vinyl ketone containing a filler are not sufficiently effective under conditions of additional structure.

Closest to the present invention is a composition containing a copolymer of ethylene and vinyl acetate and, as a stabilizing additive, thioalkofen BP-2, 2-thio bis- (4-methyl-6-tert-butnlfenol) 2.

The introduction of that stabilizer additive into the filled copolymer shows that its effectiveness in the presence of fillers (especially fibrous ones) is significantly reduced due to adsorption, and the composition has insufficient resistance to thermal oxidative degradation. Acetic acid, which is a degradation product of ethylene copolymer with vinyl acetateatoes, also has a specific effect on the stabilizers;

The purpose of the invention is povilennom resistance to thermal oxidative oxidation

15 destruction while maintaining the strength characteristics under aging conditions.

To achieve: and the stated purpose, a composition containing a copolymer of ethylene with в and nitrate, 2,2-thio-bis- (4-methyl-b20 tert-butylphenol) as a stabilizer and naprovano; 1nitel, additionally contains dioxydiphenylurea (in the following ratio components, wt.%; Ethylene copolymer 69-89 ./ with vinyl acetate Filler 10-30 Dioxide and phenyl urea phosphate 0.18-0.6 2,2-thio-bis- (4-methyl-6-tert-6utylphenol 0.12-0, 4 Dioxydiphenyl urea phosphate is a yellowish powder with a melting point. Example 1. To obtain a composition, take 100% of these lena with vinyl acetate, fiberglass filler, stabilizing additive - dioxiphene urea sodium phosphate and tioalcofen BP and B d in copolymer on rolls at mixing time 10 min.

Table 1: Oxidation induction of a stabilizing mixture of ethylene copolymer with vinyl acetate. drunk with fiberglass {T 18SRC; mm Hg, Art.) 384 PRI me R 2, Carried out analogously to Example 1, but the ingredients are taken in the following ratio, mass,%: Ethylene ethylene / ytylacetate 69, 0 Glass Fiber Dioxydiphenyl urea phosphate, 6 Tioalkofen BP0.4 Approx. Carried out analogously to example 1, but the ingredients take the following ratio, wt.%: Ethylene copolymer with vinyl acetate79, 5 Fiberglass20 Dioxydiphenylurea-urea phosphate, 3 Tialkofen BP, o, 2 Oxidation induction periods, the value of which makes it possible to characterize the chemical inhibitory effect of tabulation. oxidation are given in table. 1 description of the invention.

1. Pure copolymer 2 Bisalkofen BP 3.Tioalkofen BP 4, Irganoks 1O1O 5o Antioxidant 2246 + phosphite P2 dibutyldithiokarbonate of zinc (1: 1) 1. Dioxydiphenyl urea phosphate 7. Dioxydiphenyl urea soft nogopen optn 2. Dioxydiphenyl urea unthophenate 7. Dioxydiphenyl urea soft nogopen optn 2. Dioxydiphenyl urea untine phosphate 7. Dioxydiphenyl urea soft nogopen optn otoxoproxinopropion di-p-phenylamidothiophophate + ir1 knox 0.5 1.0 480 4OO350 0.5 1.0 420 5OO260 0.5 1.0 240 ZOOZOO 0.5 1, O 58O 4804CO 0.5 1.0 ZO 12O120 O , 5 1, О 82О 14ООПО О, 5 780 50О

Continued table. one

5. Antioxidant 2246 + fs "fit P24 dibutyl diphythiocarbonate

ciesh (1: 1: 1 ratio)

6, Dioxydiphenyl urea phosphate + tioalkofen BP

(3: 2 ratio)

.7, Dnoxidi-pheny urea-phosphate.

8, Oxy-di-p-phenylamide thiophosphate + irganox Properties of the compositions are determined by thermomechanical degradation on the wal. Continuation of table. one

500 420 340

1000 1490 1000

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Claims (2)

o From these tables it is clear that the recommended mixture of stabilizers for a copolymer of ethylene with vinyl acetate, filled with glass fiber, is much greater than the stabilized composition in inhibiting efficiency under the same conditions. The test data allows us to conclude that in this case the place of synergy, that is mutually reinforcing the effect of two stabilizing additives. The proposed stabilized polymer composition is superior in its stabilizing effect to the known ones and contributes to the improvement of the quality characteristics of products made from ethylene-vinyl acetate copolymer, which results in the prolongation of the service life during operation at a simultaneous decrease in polymer intensity. The invention polymerization composition containing a copolymer of ethylene and vinyl acetate, 2.27 8 -thio-bis- (4-methyl-6-tert-iutylfekol) and a filler, characterized in that strength characteristics in aging conditions, it additionally contains dioxidiphenyl urea phosphate in the following ratio of components, wt.%: Ethylene copolymer with vinclacetate 69-89 6-: tert-butylphenol) 0 , 12-0,4 Sources of information taken into account during the examination 1.Authorial certificate of the USSR in application No. 2468090/05, cl. C 08 L 23/08, 1977. 2. Chemical additives to polymers, pravnik, M., Himi, 1973 (prototype).