CS204926B1 - Foaming able polystyrene with improved workability and method of producing the same - Google Patents

Description

The invention relates to expandable polystyrene with improved handling properties, ^I.I. OTL ^although less ^asp en ° ^{for p} le emissivities PFT-pre-expansion and a reduced tendency ^to trortó elektrostatikkéh ^{of the cartridge P e} ns ovrc ^h for particles ^{and the} holding meehanické vlMtoosti zůstáv.ejí with ^Secret as well as the method of its production.

^б р гага of ^NO in S ^{p e} r ^{not the other} of polystyrene in order to improve ^our msg ^ACO j s ^e l ^s ký ^ i ^ch vlaEitno mainly to suppress stickiness during prefoaming, it is generally known. There are a number of compounds that show this effect. These are for example, various waxes, esters, salts and amides mmalb- NYCHA ^ 0611 ° inorganic merged ^are different ^e kfsl Towels ^and ^ ^ Mii taiiy ^co vu. . ^T EKE series polymer compounds are added to the particle surface to expandable polystyrenupro lepivooti their limitations. «

The disadvantage of these additives is the fact that their presence results in the zhor§ ^{e c} h ⁿ ěkterý properties foamed polystyr ° ^e u ^- re ^{Dev m maiden} measure ^{b s} ^ al ^^ ^{and nasáka} - vooti.

Said ^N edostatky has ^caused ěnovatelný -polystyrene improvement ^{characterized} RNI zprmwatylsk ^. The particles according to the invention, the particles of which are provided on their surface with a layer of 0.01 to 0.1 hmoonoot parts of metal salts tt. or ttt. Group VIII acid «^ L ^ ^ igo -mθtyl ^t t ^{y n} rθ dik ^TRB ldv boi ^{y s p} in ^Rc vinegar per ¹⁰⁰ parts ^of PE hmofanotních ovata ^{n e} l p ^oéhd ° Lyst ^yren u.

204 926

204 926

Expandable polystyrene is' improved processing, features of the invention are prepared so that the particles of foamable polystyrene & impregnate the _F O3 up to 3.3% hmotaootních vv ^ n: s dispese sacrificial 3-30% hmoOnnotních II metal salt. or III. groups of the Periodic Table and oligo-alpha-methylstyrene dicarboxylic acid, and from 0 to 10% by weight of surfactant and from 60 to 97% by weight of water

Oligo-alpha-methyl-4-pyrrolidinecarboxylic acid is the product of the reaction of alla-methylstyrene with sodium, followed by addition of carbon dioxide to the resulting oligomer and liberating the dicarboxylic acid from the sodium salt thus formed. The monocularity of the acid thus prepared is polluted in the range of 600 to 150%, the carboxyl group content being between 6 and 15% of the molarity, the carboxyl groups being situated at the ends of the allameeyl styrene oligomer chain. *

By surface-active love is meant anionic, catiocactic or non-ionic agent with a critical molecular concentra- tion of 0.1 to 0.0001 moo / l; an example may be sodium or potassium salts of aliphatic carboxylic acids with 10 to 20 carbon atoms.

The mixture for impregnating the polyvinylaromatic mass particles is prepared by dispersing the required amount of metal salt II using a high shear mixer, such as a high-speed blade mixer. or III. groups of the periodic system and oligo-alla-methylstyrecdicarboxylic acid into water, optionally containing a surfactant.

The efficacy of the finding can be diminished by the following interpretations.

EXAMPLE 1 ^kg of PSA ^PRs mers Pearls L, ^{0 and 2,} 5 mm was pre ^DPE n ^of n to ^p fontínuálním Red ^PEO oaadle tomrtnost to a density of ²⁰ kg / m ^. On average, at ^Uběh process was 5 ^m sampled nuta ^h »u niih ^also determined tack, expressed in percentage by volume slice. Prefoaming ma íteiál was for him ² 4 ^d in ^Å c ^h maturation foamed in the form ^of three ⁰⁰ x ²⁰⁰ x ¹¹⁰ mm. When Al ^PE0 oválc: s were monitored ^and n ^p r running ⁱⁿ the temperature inside the block and time measured from the beginning of introducing steam into the mold until ^the temperature at 93 ° Lesly ^0th In 'this ^{pl t} e ^T e is the print an utončen-making process and ^to blo! Of ^b ez poěbození removed from the mold. In the foamed material, the conductivity value was measured on bodies of normalized dimensions. For nepředpěněného dry type of foam material was determined by the ^ i ^ dd ^ ^and ^ e ^^^ N ^ ost so that beads 100 g was charged to a sieve of mesh size 1.5 mm at room třebačce was allowed to shake for 1 minute. According to standardized methods, the absorption and dimensional stability of the foamed material was determined. The evaluation results are shown in Table 1.

Example 2

The procedure according to Example ^Cart la ^d u ^{1 b} yl opatovén to Hm difference ^from an beads by ^ a ^p of ^about ovateln ^s him ^p olýstyrenu prior to prefoaming, and determining t ^ d ^ Elme-impregnated lo g of 10% aqueous dispeze glloerii-monooeθaráeu (Trade Mark No. MSPO 11) by stirring for 20 minutes in a low speed mixer. Then, the evaluation was carried out as in the example. 1, Example 3

The procedure of Example 2 was repeated except that the beads were impregnated

204 920 used. 10 g of a 10% aqueous dispersion of hydrogenated animal fats (trade name

Polynol A),

Example 4

The procedure of Example 2. was repeated, with the difference that the beads were impregnated

6.7 g of an aqueous dispersion of the calcium salt of oligo-alpha-methylstyrene dicarboxylic acid prepared by mixing 15 g of dry powdered salt in 85 g of water. .

Example 5 '. .

The procedure of Example 4 was repeated except that 6.7 g of a 15% aqueous sligs-alpha-mrtylstyrene-carbonic acid aluminum salt dispersion was used to impregnate the beads.

Table 1

Vlastnooti ^{PE eh} novateln of polystyrene depending on the impregnation · způsoto pearls

Sample according to * Ex Pre-foaming tack (% vol) Block cooling time (min) Mosaic pearls passed through sieve (% wt) Vooivost (s) water absorption (% oj dimensional change (%) 1 15.6 7.3 36 s.w-u 0.76 - 1,32 2 2.1 4.2 45 9.1Ο ¹² 3.54 - 2,70 3 4.0 4.6 48 5.1Ο ¹² 1.63 - 2,56 4 1.3 6.1 55. 1.10 “ ¹³ 0.90 - 1,60 5 0.6 5.9 56 8.10 “ ¹² 0.76 - 1,80

The examples show a positive effect of impregnation of ZPS according to the invention (Examples 4,

5) compared to the prior art methods (Examples 2, 3).

SUBJECT OF THE INVENTION

Claims (2)

SUBJECT OF THE INVENTION ^ Ěnoovtelný first polystyrene having improved processing properties, characterized in ^{t IM} that the particles are provided on their surface a thin layer of metal salt II. or III. Group VIII sligs acid-alpha-mrtyl θУyrnndikabboxylsie množžsví in 0.01 to ^0.1 parts hmotecíotní ^ vzteteno ¹⁰⁰ hmoo'nnstníc ^h ^ o HLU expandable polystyrene. 2. A method for preparing an expandable polystyrene having improved processing properties according to claim ^1, Hm important that you ^CKY zpšňovateln ^Ca ^ o impregnate the polystyrene · C ° 3 to 3.3% water dispersion hmoSnostních content ICI ^ 3-30 h ^^ Notni parts of metal salt II. or III. groups of the Periodic System and slig-alpha-mrtyl-α-yruidic acidbolylsic acid, and 0 to 10 parts by weight of the surfactant.