CS209137B1 - Agent for improvement of forming properties of foamable polystarene and method of its production - Google Patents

Description

(54) The means for improving the processing properties of expandable polystyrene ла and the method for its production

BACKGROUND OF THE INVENTION The present invention relates to compositions for improving the processing properties of styrene-elongated polyols and to a process for the preparation thereof. The composition is applied in the form of a thin film to the surface of the foamable polystyrene particles as an aqueous dispersion, the main active ingredient of the composition being the metal salt II. or III. groups of the Periodic Table and oligo-alpha-methylstyrene-alpha-omega-dicarboxylic acid. An aqueous dispersion for application to a foamable polystyrene is prepared by precipitating the active ingredient from an aqueous solution of the sodium salt of oligo-alpha-methylstyrene-alpha-omega-dicarboxylic acid with a sub-stoichiometric amount of a water-soluble inorganic metal salt II. or III · groups of the periodic system.

209 137. . 1 ·,

The invention relates to a composition for improving the processing properties of a panizable polysilene (ZPS) and to a process for the manufacture of the composition.

The composition suppresses the tackiness of ZPS at. pre-punching 'and reduces - the tendency to form electrostatic charge' - on the particle surface of the ZPS. the mechanical properties of the modified ZPS remain unchanged.

Modifying the ZPS to improve its reprocessing properties, particularly to suppress stickiness in foaming, is well known. . There is a wide range of Fridays * that show this effect. For example, various waxes »esters, salts and amides' of greasy cartoons. Among the inorganic substances, there are various bits and carbonates of some metals. Also, a number of polymeric substances are added to the surface of the ZPS for tackiness.

The above compounds to nepředpěněné ZPS nanáěejí particles in the form of an aqueous dispersion, the optimum dosage of the active substances generally varies kolem.Ó, 1 'hmoonostních • ^K in parts per 100 parts of the PSA hmoonnesních.

A disadvantage of these means for improving the processing properties of ZPS 'is. however, the fact that their presence results in a deterioration of some of the properties of foamed polystyrene - especially dimensional stability and oasákavauSi. In addition, dispersing the active substances into the. water puts considerable demands on. the equipment on which it disperses and often. requires the use of other excipients which stabilize the dispersion and stabilize the finished dispersion. '.

These drawbacks have no means for improving the processing properties of the invention. This composition is composed of 3 to 15 parts by weight of the salt of the cartoon - oligo-alpha-methyl-styrene-iodicarbonate with a molar mass. 550 - up to 800 and metal II. or III. groups of the periodic system,. 1 to 5% by weight of the sodium salt of cresol-affa-methylsilyl iodine carboxylate having a molecular weight of 550 to 5% by weight. 800 to 80 parts by weight of water and 0 to 5 parts by weight of other active substances to improve the processing properties of the ZPS.

Means for improving processing properties of ZPS according to the invention. se. prepared by treatment with an aqueous solution of an inorganic metal salt II. or III. - a group of the periodic system into an aqueous solution of the sodium salt of cassette uligu-afaam-ethyl-β-rendicarbo-quartz, in which, if desired, another active substance can be dispersed to improve the processing properties of the ZPS, the inorganic salts being dosed 65 to 90% calculated - for the sodium salt of the cassette of uligu-affa-methyl-bondyl buxyl and the reaction mixture - is simultaneously stirred.

The term " uligo-afaa-methylthyrene-alpha-omega-glycolic acid " refers to the product of the reaction of alpha-methrlstyrene with sodium, followed by the addition of carbon dioxide to the resulting oligomer and liberation of the dicarboo quartz from the sodium salt thus formed. The amount of carbohydrate groups is between 10 and 16% by weight, with the carboxyl groups being located at the end of the oligomer chain - alpha-methylmethyl.

Inorganic metal salt II. - or 1H. - a periodic system - is understood to be any soluble salt, preferably chloride, - wherein the cationic - may be calcium, - zinc, aluminum, or other

Other active substances for improving the processing properties of the ZPS are known substances for which the beneficial effect is known, such as various waxes, esters, salts and amides of fatty acids or inorganic oxides and carbonates.

The effectiveness of the invention can be illustrated by the following examples.

Example 1

A dispersion for impregnating pearls of ZfS was prepared by adding to the 100 g of an aqueous solution containing 15 g of the sodium salt of oligo-alpha-methylethyreD-alpha, omega-dicarboxylic acid, with stirring, 70 eteethiometric amounts of calcium chloride, ie 2.3 g CaClg. in 50 g of an aqueous solution. Both solutions were heated to 75 ° C before mixing. The resulting milky white dispersion did not tend to phase separation upon storage for 1 week.

Example 2

The procedure of Example 1 was repeated with the difference that 5 g of hydrogenated animal fats (trade name Polyool A) were pre-dispersed into the sodium oligo-alpha-methylstyrene-alpha, omega-dicarboxylic acid solution. g of this dispersion is diluted with 45 ml of water.

Example 3 kg of ZPS having a bead diameter of 1.0 to 2.5 m and impregnated with 10 g of a water dispersion of hydrogenated animal fats (trade name Polynol i) containing 1 g of active substance (Polynol A) and 0.1 g of dispersion stabilizer in this case, potassium stearate. The impregnation of the beads was performed by stirring for 20 minutes in a small ball. The impregnated dry material was then determined to be classifiable by placing 100 g of beads on a 1.5 mm sieve and allowing it to shake for 1 minute on a laboratory shaker.

The impregnated ZPS was pre-foamed on a continuous pre-foam to a specific gravity of 20 kg / nA. The foamed material was foamed in the form of J00 x 200 x 110 mm after 24 hours of maturing. During the foaming, the temperature inside the block was monitored for the introduction of steam into the mold until the temperature dropped to 93 ° C. At this temperature the foaming process is complete and the block can be removed from the mold without damage. hodnota the value of the electrical conductivity was measured on bodies of standardized dimensions on the bodies of the foamed material and by the unrealized methods the water absorption and dimensional stability of the foamed material was measured.

The evaluation results are shown in Table 1.

brfklad 4

The procedure of Example 3 was repeated, except that the dispersion prepared in Example 1 was used to impregnate the ZPS beads in an amount of 5 g / 1 kg of ZPS, i. 0.35 g active agent (calcium salt of oligo-alpha-ethyl-styrene J-alpha, omega-dicarboxylic acid) per kg of ZP9. The evaluation results are again shown in Table * 5

Example 5

The procedure of Example 3 was repeated except that the dispersion prepared in Example 2 was used to impregnate the ZPS beads at an amount of 6 g / lkg of ZPS, i.e. 0,45 g · active ingredients per 1. kg ZPS · Evaluation results are given in Table 1.

Example 6.

The procedure of Example 4 was repeated except that the dispersion prepared as in Example 1 was used for the beads of ZPS, but to precipitate the active ingredient from the sodium salt of α-γ-alpha-methyl-styrene. Calcium chloride was not instructed in calcium chloride, but in stoichiometrically equivalent amounts of aluminum chloride, i.e. 1.3 µg of AlCl 2 in 50 g of solution. The results of the foamed material evaluation are presented in Table 1.

Evaluation of foamed moaterials Dimensional change rpn. cs & e- snorá «^ й · * o ^. ™,

Expanded eye block ^{(s) (} % ^0ь,)

Example ?? ^{iooá slžžka} g. disperse

(% vol) (SlO) sieve (% wt.) 3 Ool ol ^{P y} A ^4, 0 4 »6 48 5.10 “ ¹² 1.63 -2.56 calcium salt of acid 4 oy · oligo-alpha-me- _q 6.0 56 ' 7.1Ο “ ¹ · ³ 0.75 - 1 ^, 22 omega-dicarboxylic acid Lime-leavened salt lioy OLigo-aLla- —19 5 meethystyrene-alla 1.0 4.8 57 2.10 ¹² 1 ^, 25 - 1,54 omoggfdikía? booχlo- + Polyool A ⁴ Aluminum acid salt ** 6 oy aoligo-alpha-me- o <Wls-tyren-alla, ° ' ^b omeggadicarbojxri 5.9 52 6.10 “ ¹² , · 0.70. - 1 ^, 30 X base sample x) 15.6 7.3 36 5Л0 ¹⁴ 0.76 - 1,32

(x) 'ZPS' without 'coating' means improving processing properties

Claims (2)

'PilDMil-VTláblíU ·. CLAIMS 1. A composition for improving zinc ^and / or olefinic properties of yρέηοοεύθΙοέΗο ppOytytyre, which is comprised of 3 to 15 parts by weight of the salt of oligo-flp-oθtol-ttyreoX. -alpha, omega-dicarbžxyl and molecular ЬооОьоо ^ 550 to 800 and metal II. or III · groups of the periodic system, 1 to 5 parts by weight of sodium oligo-alpha-o-O-styrene-dicarboxylic acid sodium salt with a molecular weight of 550 to 800, 0 to 5 parts by weight of other active substances - improving the processing properties! foamable polystyrene and 80 to 96 parts of water 2. A process for the preparation of a composition according to item 1, by treating with an aqueous solution of an inorganic metal salt II. or III. - Group VIII - Aqueous Solutions of the system to sodné.soli ester of oligo-alpha-methylstyrene-alpha, omega-dikarbojqrlové _f - to - which is possibly different predispersed úěinná ^ ICI component improves properties also zpracovaaelské expandable polystyrene, thio characterized in that - the reaction is carried out with a substoichiometric multilayer inorganic metal salt II. or III. groups, the amount being 65-90% - the amount of stechomeomeeric.