CS267303B1 - Stabilization mixture for polyvinyl chloride - Google Patents

Abstract

The solution relates to a stabilization system for polyvinyl chloride, the components of which are available on the domestic market. The stabilization mixture according to the solution contains 2 to 3 parts by weight of calcium oxide, 1 to 2 parts by weight of epoxidized rapeseed oil, 1 part by weight of the antioxidant di-dodecyl ester-2,6-dimethyl-3,5-(1,4-dihydropyridine)-dicarboxylic acid C^H^O^N, 2 parts by weight of ethyl acetoacetate and 0.5 parts by weight of phthalic acid base with a saponification number of 140 to 160, a solidification temperature of 70 to 74 °C, a pouring temperature of 76 to 81 °C and an acid number of 15 to 20. The mixture may also contain 1 part by weight of zinc stearate. The above-mentioned stabilizing mixture is suitable for stabilizing polyvinyl chloride, which is used for technical purposes.

Description

EN 267 303 B1 1

The present invention relates to a stabilizing composition for polyvinyl chloride.

Polyvinylchloride, industrially produced, is not possible to be treated and applied to ineffective stabilizing mixtures. Especially the requirements for a quality stabilization system are: high thermal stability, at least color changes in the heat stressed polymer, health safety, satisfactory mechanical properties of the products, availability of components of a stable system on the domestic market and their relatively low price.

For technical purposes, one of the main components of the stabilizing blend is currently the imported tribasic lead sulphate stabilizer NS 5012. The disadvantage of this stabilizer is its carcinogenicity and the economical necessity of foreign exchange when importing it, which adversely affects the cost of the stabilizing blend.

While stabilizing according to CSA 256 709, the amount of said stabilizer is reduced, but is not completely removed from the stabilizing mixture.

This disadvantage is substantially solved by the stabilization mixture according to the invention, which comprises 2 to 3 parts by weight of calcium oxide, 1 to 2 parts by weight of epoxidized rapeseed oil, 1 part by weight of antioxidant dodecyl ester-2,6-dimethyl- 3,5- (1,4-dihydropyridine) -dicarboxylic acid of formula C31H59 ° 4N * 2 parts by weight of ethyl acetoacetate and 0.5 parts by weight of phthalic acid base with a number of soaps of 140 to 100, freezing point 70 to 74 ° C, dropping point 76 to 81 ° C and an acid number of 15 to 20.

The stabilizing composition of the invention may also contain 1 part by weight of stearate.

Samples stabilized with this stabilizing mixture retain high value stability and thermal stability at 180 ° C. All the components of the above-mentioned stabilizer mixture are obtained from raw materials available on the market, which means savings in foreign exchange for our economy. If the antioxidant is harmless to health, prepolyvinyl chloride for food use will also be suitable for stabilization.

The invention is illustrated by the following examples. Example 1 «100 wt. parts of suspension polyvinyl chloride / Slovinyl 5-621 / are mixed with 0.5 wt. phthalic acid-based wax / HOBCHST-VACHSB wax - is an ester wax of montanic acids with a freezing point of 70 to 74 ° C, a saponification number of 140 to 100, an acid number of 15 to 20, a drop point of 76 to 81 ° C and a density at 20 ° C ° C 1.01 to 1.03 g.cm "3/3 wt. parts of calcium oxide of food grade, 1 wt. of the di-dodecyl 2,6-dimethyl-3,5- (1,4-dihydropyridine) -di-carboxylic acid antioxidant of formula C3i5904N / DHP / 2 wt. parts of ethyl acetate.

The whole mixture was homogenized and calendered at 180 ° C for 3 min. to form a 0.15 mm thick film. The thick film sample was thermally degraded in an air stream at 180 ° C. Stage ČSN 640 751 time of thermal stability was 140 min / Color changes indicated

Claims (2)

CS 267 303 B1 on PVC 03 stabilizers were observed at 180 ° C at 15 and at 170 ° C for 25 min. Example 2 A sample was prepared similar to Example 1 eo by a composition of 100 wt. parts of polyvinyl chloride (S-621), 0.5 wt. phthalic acid-based wax parts / physico-chemical characteristics as in Example 1, 2 wt. CaO Food Parts; Quality, 2 wt. parts epoxidized rapeseed oil, 1 wt. part of zinc stearate, 1 wt. part of the antioxidant DHP, 2 wt. parts of ethyl acetate. Thermal stability 105 min, color stability at 180 ° C 40 min, at 170 ° C 60 min. SUBJECT MATTER CLAIMS 1. A polyvinyl chloride stabilizing composition comprising 2 to 3 parts by weight of calcium oxide, 1 to 2 parts by weight of epoxidized rapeseed oil, 1 wt. parts of di-dodecyl 2,6-dimethyl-3,5- (1,4-dihydropyridine) -dicarboxylic acid antioxidant, C vzorcaHHjjOjN, 2 parts ethyl acetate and 0.5 part wax with a phthalic acid base having a saponification number of 140 to 160, a freezing point of 70 to 74 ° C, a dropping point of 76 to 81 ° C, and an acid number of 15 to 20. 2. A polyvinyl chloride stabilizing composition according to claim 1, wherein the polyvinyl chloride is 1 part by weight of zinc stearate.