CS210406B1 - Plastlaol based on homonolymers and / or copolymers of vinyl chloride with enhanced thermal stability. - Google Patents

Abstract

The invention describes a plastisol with increased stability based on the synergistic effect of organometallic stabilizers of iron oxide and magnesium or aluminum oxide, this effect decreasing with increasing content of alkaline residues in the polymer. Therefore, the polymer component of the plastisol is composed mainly of suspension, microsuspension, microbead or block polymerized homopolymer or copolymer of vinyl chloride. The plastisol according to the invention is particularly suitable for technologies with high thermal stress of the gelatin, for example casting, dipping or coating on metals.

Description

210 400

The invention and the invention relates to a plastisol based on homopolymers and / or copolymers of vinyl chloride by enhanced thermal stability, suitable especially for high temperature graphite technologies and a gelling temperature above 170 ° C.

The < RTI ID = 0.0 > sol < / RTI > & plases used during the technological cycle are subjected to high thermal stress and need to be readily stabilized by high-temperature thermal stabilizers. Among the most effective stabilizers were organo-tertiary, tloglycolate, mercaptide, ester, and alcohol-alcohol compounds, including barium, cadmium, fumed and calcium salts of organic acids, further organic and inorganic lead compounds. In order to increase the effect of these compounds, there is an exploiting effect, due both to the mutual mixing of the stabilizers and to the addition of co-catalysts, for example epoxide compounds, organochlorine inorganic compounds of phosphorus, oxides, hydroxides and salts of elements of the 1st and 2nd group periodicates. , or an organometallic compound * Compared to the organotin compound, the other systems have a particularly low efficiency. The sulfur-containing organo-olefin compounds are extremely effective stabilizers, but the disadvantage is the inherent sting and odorous products, resulting in thermal degradation of the plasticized salts thereof. The disadvantage of all banded systems is that, to achieve the thermal stability necessary from the technological point of view, In particular, high doses of compressors are needed for the spillage and quenchers. In doing so, the length of the induction period does not increase in proportion to the increase in the stabilization system, especially in the case of concentrations above 1 per cent relative to the polymer in the organisms and above 2 per cent in the other compounds.

Mixtures of organo-tin stabilizers with magnesium oxide or cicllium in the presence of iron oxide and in particular ferric oxide exhibit a mild, high-synergistic effect, and the stabilizing effect of such a system is higher than can be expected from summations of individual components or pairs of pairs. However, this effect decreases with the increasing content of residues from the polymerization system in the polymer, especially the alkali and the alkali content of sodium hydroxide higher than 0.1 penent range, is less than two thirds of the induction period as the same plastisol without alkali residues. . The highest thermal stability is achieved when the plastisol polymer component contains a high proportion of the suapenzene, microsuspension, microparticle, or block polymerization produced polymer types.

SUMMARY OF THE INVENTION The present invention relates to plastisol based on homopolymers and / or copolymers of vinyl chloride with improved thermal stability, the polymer component of which comprises from 15 to 65 percent of a suspending polymer, further from 20 to 70 microns or microspheres or block polymerization of the produced polymer or blend, and up to 50 percent of the emulsion polymer, wherein the alkali content of the polymer is in the polymer! is converted into sodium hydroxide to less than 0,1 per cent with respect to the polymer, the stabilizing system of which is between 0,1 and 2 per cent of an organo-metallic stabilizer, 0,2 to 4 per cent of ferric oxide or a mixture of iron oxides in which the iron oxide more than 60 perooent, further from 0.1 to 0.8 per cent of magnesium percarbonate or alumina and any mixture, wherein the dosages of all constituents of the stabilizing system are related to polymer 2

21U 40B plastleol component.

Since the composition of the stabilizing system is similar, it is preferable to use sulfur-free types in which the jeoin is bonded to an alkoxy or ayl moiety, or mixtures thereof with mercaptide or thioglycolate type organo-polystyrene stabilizers. This reduces the odor of the stabillus system and decomposition products. The Piastisol of the present invention has a high proportion of alkali-containing emulsion polymers, stabilized by highly potent organotin-containing thioglossate or mercapto-type stabilizers, compared to the known plas- tolsol, two to three times the longer induction period with the same organotin component dosage. , or the same induction period at a less than one-half dose of the organo-olefin component. In addition, the process of color change of gelatin due to the thermal degradation of the polymer and the removal of hydrogen chloride is slowed down because in the presence of the ash system the catalytic effect of hydrogen chloride is reduced to further decompose the polymer. The polymer will withstand the higher temperature loading of the gelatin, which will allow its geometry to increase or increase its thickness. Reducing the concentration of decomposition products reduces the corrosion of the form and improves the environment. Example 1

Piastisol, the polymeric component of which is a blend 50 of a suspension of polyvinylchloride suspension having a K-value of 68, and a pen of poly-vinyl chloride with a K-value of 75 and 25 of an emulsion pen of polyvinylchloride having a K-value of 70, wherein the alkali metal salt content of the emulsion polymer is after conversion to sodium hydroxide less than 0.2 penent and other types of polymer are free of alkalis. The stabilizing system consists of 0.4 penent of an organo-tin stabilizer, represented by a dibutyloin-S, S'-bis-isooctylmercaptoaoetate mixture of dibutyloin minor in a ratio of 3: 1, further 1 pen of iron oxide, 0.2peroenta of magnesium oxide and 0.2 pen of alumina wherein the doses of the component system are related to the polymer component of the plastleol. In addition to the polymeric constituent and stabilizing system, the piastisol ester contains esters of the ester type, viscosity regulators and surfactants, inorganic fillers and pigments, which are not directly related to the present invention. Example 2

Piastisol, the polymeric component of which consists of a mixture of vinyl chloride emulsion copolymer 30 vinylaethate 5-penet, with a K-value of 65 and a alkali-alkali content of sodium hydroxide less than 0.2 penta, and a K-value of 65 and 40 K-value suspending polyvinylchloride penents, wherein neither the microspheres nor the suspension polymer contain alkali residues. The stabilization system consists of a mixture of 0.4 penta dibutyloin mleinate, 0.8 penta iron tetrafluoride and 0.4 penta magnesium magnesium pellets, with the components of the stabilizing system being linked to the polymer component of the plastleol. In addition to the polymeric component and the stabilizing system, the piastisol phthalate softeners, pigments, monomeric glycosylate and polymerization initiator include peroxy type, polymerization catalyst, organic filler, and fabricator regulator, and are not directly related to the subject matter of the invention.

Claims (3)

1. A plastic based on homopolymers and/or copolymers of polyvinyl chloride with increased thermal stability, characterized in that its polymer component contains 15 to 65 percent of a suspension polymer, 20 to 70 percent of a microsuspension or microbead or block polymer produced polymer or a mixture thereof, and 5 to 50 percent of an emulsion polymer, wherein the total content of alkali residues in the polymer is less than 0.1 percent, calculated as sodium hydroxide, and whose stabilization system consists of a mixture of 0.1 to 2 percent of an organometallic stabilizer, further 0.2 to 4 percent of iron oxide or a mixture of iron oxides, in which iron oxide constitutes less than 60 percent, further 0.1 to 0.8 percent of magnesium oxide or alumina or light milled, the doses of the components of the stabilization system being based on the polymer component of the plastisol. 2. Plaetisol according to item 1, in which the polymer component is formed by a homopolymer or copolymer of ethylene chloride with ethylene acetate or ethylene chloride or propylene or ethylene-ethylene acetate, wherein the ethylene chloride content is always higher than 80 percent and the K-value is in the range of 55 to 80. 3. The plaetisol according to item 1, in which the organometallic stabilizer is dibutyltin maleate or dibutyl-alkoxytin-alkylmaleate of the formula CH _q O0G-CH.CH-COO-R ¹ where R ¹ * ' Sn °4 ^H 9 0-R ² alkyls or dibutyltin mercaptld formulaoa C _a H _q SR ³ -C00-R ⁵ where R ^{3 is} 5 6 ^C 4 ^H 9 S-r4_co0-r6 °1 ^c gaa and ^R are the same or different alkyls 0 ₂ ®ž ^c n » or a mixture of sulfur and sulfur-free derivatives of the above. and R are the same or different from θ! to C ₄ ,