SU854951A1 - Composition for producing porous plastic material - Google Patents

Description

one

The invention relates to compositions that foam when heated under the action of gases released during decomposition of gas formers, and can be used in the industrial heat and sound insulation materials, artificial leather, decorative coatings and other materials based on plasticized polyvinyl chloride.

A known composition comprising polyvinyl chloride, a plasticizer, a stabilizer, a porophore, which foams when heated due to the decomposition of azodicarbonamide.

However, the foaming of such a composition requires prolonged exposure to high temperature. (140-180 ° C) p.

The closest to the technical essence of the present invention is a composition for the preparation of foam plastic, including polyvinyl chloride, dioctyl phthalate, azodicarbonamide and activator

its decomposition. As an activator of the decomposition of azodicarbonamide, the composition contains a mixture of urea and K-Zn-2-ethylhexoate as a solution in triethylene glycol 2}. . The heat treatment time for this composition is reduced to 15 minutes, but still remains quite long, and this limits the use of such a composition in continuous production processes. In addition, it is necessary to use a solvent, this also significantly limits its scope.

ts

The purpose of the invention is to increase the thermal stability of the composition and accelerate the process of its foaming.

Claims (2)

This goal is achieved in that the composition for the preparation of a foam, including dioctyl polyvinyl chloride, azodicarbonamide and an activator of its decomposition, contains 3 ureas, zinc oxides of titanium oxide barium stearate and cadmium stearate in the following ratio of carbon masses, matte, t. .: POLIVIALCHLORIDE 100 Dioctyl phthalate 30-65 Azodicarbonamide Urea 0.1-1.5 Zinc oxide 1-10 Titanium oxide 1-10 Barium stearate 0.5-1.0 Cadmium stearate 6.5-1.0 Example 1-10. Mix the tO-15 min at room temperature in a planetary mixer following components, May. h .; Emulsion Polyvinyl Chloride E-62 Dioctyl phthalate Azodicarbonamide B Amount Titanium dioxide. Zinc oxide wa, indicated in the table. Urea Stearate bari Stearate cad then the resulting mixture passes through a paint mill, the rolls of which are cooled with water (temperature After this paste is applied with a squeegee with a thin layer (0.24 tO, 01 mm thick) to the kraft paper and heat treated 1 min at the temperature of the mass of 2004.c. The foaming rate of the compositions is compared by the coefficient of foaming (the ratio of the thickness of the foam to the thickness of the initial layer of the composition is 0.2 mm). The thermostableness of the samples is determined according to GOST 14041-68, Properties of polyvinylchloride Examples of compositions are given in Table 1. Example P-14. In accordance with Examples 1-10, a mixture of the following composition is prepared, in hours: Emulsion Polyvinyl Chloride (E-66P) In the amount of Dioctyl Phthalate Azodicarbonamide listed in Table 1 Urea Oxide zinc Titanium oxide 1 Barium stearate 1 Cadmium stearate Foam preparation and determination of the composition of the composition are carried out similarly to Examples 1-10. The results are given in Table 2. Example 15. The following components are mixed for 12 minutes at room temperature in a planetary mixer:: Dioctyl phthalate 50 Emulsion polyvinylchloride (E-66P 100 Azodicarbonamide 4 Titanium dioxide Zinc oxide 8 x 2, Urea. 4, Barium Stearate 6.5 Cadai Stearate 0.5 Then the resulting mixture is passed through a spray mill, the rolls of which are cooled with water (Sample temperature). After milling, the paste is applied with a rakle by applying a thin layer (0.20 ± 0.02 mm thick) to the craft paper and subjected to heat treatment at 170tl C, then at 245 ± 5 40 s at each temperature. Thermal stability is judged by the presence of darkening of the sample after foaming. The results of the experiment are given in table.3. Example 16 (control), a composition is prepared in accordance with Example 15, except that metal oxides are not used in the composition (). The preparation of the foam is carried out as in Example 15. The results of the experiment are shown in Table 3. and measure 17 (reference;. A composition was prepared in accordance with Example 15, except that urea was not used in the composition. The preparation of foam was carried out in accordance with the conditions of Example 15. The results of the experiment are shown in Table 3. Example 18 (control). A composition according to Example 15 is prepared, except that metal stearates (Ba, Cd) are not used in the Composition. Polystyrene is prepared in accordance with the conditions of Example 15. The results of the experiment are listed in Table 3. Table 1 shows that only the predicted polyvinyl chloride composition The tested ones are suitable for use in intensive foaming processes (at temperatures up to,): at 245i $ C as well as at, the synergistic effect of the urea system and metal oxides of metal stearates clearly manifests itself. The rate of expansion of azodicarbonamide in the presence of the proposed mixture is much higher ( 2-3 times more than when used as an accelerator for each of the components in ECV and valency quantities: The prepositioned composition is characterized by high thermal stability, which in combination with a high foaming rate it can be used in high-performance continuous processes for the production of polyvinyl chloride based foam pellets. The foam produced by using this composition is elastic, has a uniform structure and low surface water absorption due to the presence of closed pores. You can get the foam of any color from white to black using various pigments. Achieving economic effect when using the proposed polyvinyl chloride composition in industry is determined by an increase in the foaming rate. 1 8 Claims of the invention A composition for producing a foam plastic comprising polyvinyl chloride, dioctyl phthalate, azodicarbonamide and an activator of its decomposition, characterized in that, in order to increase the thermal stability of the composition and accelerate the process of its foaming, as an activating agent for decomposition, it is asparctane. : will contain a mixture of urea, zinc oxide, titanium oxide ;, barium stearate and cadmium stearate at the following. (Ratio of components mac.: POLIVINILHLORID100 Dioctipphthal 30-65 Azodncarbonamide 2-6 Urea 0, Zinc oxide. I-IO Titanium oxide 1-10 Barium stearate 0.5-1 Cadmium stearate 0.5-1. Sources of information, those taken into account during the examination 1.Isakovich, GA, Rozovsky, VS, Smel'nsky, VL Gas-filled plastic for building thermal insulation: Overview 1, SI, M., 1969, p. 2. Patent of the GDR 91346, cl. 39 3/30, published. 1972 (prototype).