SU1754739A1 - Polymeric composition - Google Patents

Abstract

Use: for the production of products with high resistance to heat. SUMMARY OF THE INVENTION: The composition comprises (by weight) 100 PVC. 40 dioctyl phthalate, 1. -3 barium stearate, 1-3 cadmium stearate. 1-3 epoxidized soybean oil and 0.1-1.0 1- (4-hydroxy-3,5-diisopropylphenyl) dihydro-2.4-pyrimidi-dione or its 5- or 6-methyl derivative of the structural formula (C6H2 (OHXC4HN2O2RiR2 CH (CH3) 2.rfle RI and R2-H or methyl. 1 tab.

Description

The invention relates to a polymeric composition based on plasticized polyvinyl chloride and can be used in the manufacture of products with enhanced heat resistance.

A known stabilized polyvinyl chloride composition comprising, as a heat stabilizer, tri (p-nonylphenyl) phosphite (phosphite NP).

The disadvantage of this composition is low temperature resistance.

Closest to the invention in terms of composition and effect achieved is a composition based on polyvinyl chloride (PVC), containing dioctyl phthalate (DOP), barium and cadmium stearates, epoxidized soybean oil (EFM) idiphenylolpropane (DFP) as a heat stabilizer.

However, in the process of thermal-oxidative degradation of the film from such a composition

stained significantly and not sufficiently heat resistant.

The purpose of the invention is to obtain a neo-composition based on polyvinyl chloride and increase its thermal stability.

To achieve this goal, the composition on PVC and PVC, including dioctyl phthalate, barium and cadmium stearates and epoxidized soybean oil, contains 1- (4-hydroxy-3,5-diisopropylphenyl) -dihydro-2,4-pyrimidinedione as its heat stabilizer or 5- or 6-methyl derivative of the structural formula OH

(CH3) (CH) 2 R2TV

 Rtyh

where RI and R2 is hydrogen or methyl,

w

Yo

ABOUT

J

V

Sl

in the following ratio of components, parts by weight:

Polyvinyl chloride 100

Dioctyl phthalate 40

Epoxidized Soy

oil1,0-3,0

Bari Stearate 1.0-3.0

Cadmium stearate 1.0-3.0

1- (4-Hydroxy-3,5-diisopropylphenyl)

-dihydro-2,4-pyrimidine or

its 5 or 6 methyl

derivative0,1-1,0

1- {4-Hydroxy-3,5-dimzopropylphenyl) -dihydro-2,4-pyrimidine and its 5- or 6-methyl derivative are new, non-described compounds. They are white powders.

EXAMPLE 1. Preparation of 1- (4-hydroxy-3,5-diisopropylphenyl) -dihydro-2,4-pyrimidinedione.

In a three-necked flask equipped with a stirrer, a reflux condenser and a dropping funnel, 41.2 g (0.2 g-mol) of 1- {4-hydroxyphenyl) -dihydro-2,4-pyrimid-indione are heated in 130 ml of 80% sulfuric acid to 70-80 ° C. With stirring for 0.5 hours, 62 ml (0.6 gmol) of 2-propanol are introduced and stirred at the same temperature for 4 hours. Then, 200 ml of water are poured in, the separated crystals are filtered, washed with water. After recrystallization from ethanol, 47.97 g (82.7%) of 1- (4-hydroxy-3,5-diisopropylphenyl) -dihydro-2,4-pyrimidinedione are obtained. T. pl. 198.5-199.5 ° C.

Found,%: C 66.0; 66.67; H 7.70; 7.86; N 9.58; 9.56.

Calculated,%: C, 66.21; H 7.59; N 9.66.

PRI mme R 2. Preparation of 1- (4-hydroxy-3,5-diisopropylphenyl) -5-methyldihydro-2,4-pyrimidinedione.

Under the conditions of Example 1, 44 g (0.2 g mol) of 1- (4-hydroxyphenyl) -5-methyldihydro-2,4-pyrimidinedione and 62 ml (0.6 g mol) of 2-propanol yields 41 g (76%) of 1- (4-hydroxy-3,5-diisopropylphenyl) -5-methyldihydro-2,4-pyrimidinedione. T. pl. 120-121 ° C.

Found,%: N 9,32.

Calculated,%: N 9.50.

Example Preparation of 1- (4-hydroxy-3,5-diisopropylphenyl) -6-methyldihydro-2, 4-pyrimidinedione.

Under the conditions of example 1, out of 44 g (0.2 g mol) of 1- (4-hydroxyphenyl) -6-methyl l dihydro-2,4-pyrimidinedione and 62 ml (0.6 g mol) of 2-pro 36 g (64%) of 1- {4-hydroxy-3,5-diisoproprylphenyl) -b-methyldihydro-2,4-pyrimidinedione is obtained from the panol. T. pl. 178-179 ° C.

Found,%: N9.59.

Calculated,%: N 9.60.

EXAMPLE 4. Powdered polyvinyl chloride, dioctyl phthalate, epoxidized soybean oil, and stabilizers are subjected to mechanical agitation. The mixture is thermoablative for 40 minutes at 70 ° C in an air thermostat and kept at room temperature for 2 days. Films are prepared from the resulting mixture by rolling. Rolling mode: temperature 150 ° C, time 7 min, gap between rolls 0.2-0.5 mm, fraction 1: 2,

To determine the color fastness, the samples of the films are subjected to thermal aging at 175 ° C for 360 minutes in a Stabilimeter instrument.

The thermal stability of the films is determined by the time before the onset of HCI release by the Congo-Roth method (GOST 14041-68),

Formulation of the mixture and the results of the tests are shown in the table.

From the data presented in the table, it is clear that the proposed stabilizers do not stain polymer films both during processing and in the process of thermal aging, whereas in the presence of Phosphite NP and DFP, the films acquire a yellow tint. In terms of thermal stability, the proposed stabilizers are also significantly superior to the known stabilizers Phosphite NF and DFP.

Claims (1)

Claims of the Invention Polymer composition comprising polyvinyl chloride, dioctyl phthalate, barium stearate, cadmium stearate, epoxidized soybean oil and a heat stabilizer, characterized in that. that, in order to obtain an unpainted composition and increase its thermal stability, it contains 1- {4-hydroxy-3,5-diisopropylphenyl) dihydro-2,4-pyrimidine-dione or its 5- or 6-methyl derivative of the structural formula as a heat stabilizer whether (СН31гНС СН ( R2TNYO Riy NH where Ri and Ra are hydrogen or methyl in the following ratio of components parts by weight: Polyvinyl chloride 100 Dioctyl phthalate 40 Bari Stearate 1.0-3.0 Cadmium stearate 1.0-3.0 Epoxidized Soy oil1,0-3,0 1- (4-Hydroxy-3,5-diisopropylphenyl) dihydro-2,4-pyrmidinedione or its 5- or b-methyl derivative 0.1-1, p. Sample t - 1- "1-hydroxy-3,5-di. Eop | x saws" enyl) digigyl (o-2,6-) iriium indio; J - 1 - (- girokek- -3,5-dimopropyl) -5-m ty1CH№hydro-gb-piri idindyo "3 .-" - (- hydroxy-ZL-dimsetrotil-mil-me-tildngmdro -g, h-pyrmidine ... ..