A method of obtaining a self-extinguishing foam plates

 

(57) Abstract:

The invention relates to the production of self-extinguishing foamed slabs of polystyrene, molded extrusion method. The invention can be used in civil and industrial construction as insulation material with low inflammability. According to the invention self-extinguishing foamed plate is produced by mixing polystyrene with antipyrine - hexabromocyclododecane and synergistic additive, which is a mixture of tri-(2,4-ditretbutyl)phosphite with octadecyl-3-(3,5-ditretbutyl-4-hydroxyphenyl) propionate, taken in the ratio of 4:1 in the amount of 0.005-0.1% of the mass of extrudable mixture. Next, carry out the melting of the mixture in the extruder. Injected into the melt blowing agent and carry out the extrusion mixture in the presence of nucleator on the basis of talc through a flat die plate. Formed into penality. As nucleator can be used a mixture of talc with a dispersion of particles 3-10 microns in an amount of 0.2 to 1.5 wt.% and aluminum hydroxide in an amount of 0.01-0.06 wt.% from the mass of extrudable mixture. Get penality with high strength characteristics, having a Flammability category of G1. 2 C.p. f-crystals, 1 table.

From the tee, to obtain self-extinguishing foamed slabs of extruded polystyrene way.

Expanded polystyrene (EPS) has a very low conductivity (0,028-0.037 W/moC) and is widely used in civil and industrial construction as insulation material. For use in the construction of the PPP should have reduced Flammability, in particular, independently of collapse when removed from the flame and do not form at burning burning drops. Such materials meet the category G1-G3 (better G1-G2) according to GOST 30244-94.

To obtain self-extinguishing polymers they injected substances, does not support combustion (flame retardants). The difficulty of selecting a flame retardant for PPP is that many effective flame retardants for plastics (e.g., decabromodiphenyl oxide) interfere with the normal foaming and do not allow to obtain a material with a low bulk density and simultaneously with high strength characteristics. As a flame retardant for PPP is widely used hexabromocyclododecane (HBCD), do not affect the foaming, but the use of one of HBCD allows you to get PPP only category G4 GOST 30244-94, i.e. the burning of such material is accompanied by the project 19624827, MKI6C 08 L 25/04, publ. 02.01.98,] a method of obtaining self-extinguishing PPP, according to which the polystyrene is mixed with not less than 12% wt. flame retardant, loaded into an extruder, melt the mixture, the melt is injected blowing agent and ekstragiruyut PPP through a flat die plate with forming plates of a width of 150 mm and a thickness of 30 mm as a flame retardant using a mixture of a metal hydroxide, in particular Mg(OH)2with a compound of phosphorus, in particular triphenyl, in the ratio 1: (1-15). In the examples, the polystyrene (PS) mixed with 2-5% Mg(OH)2and 10% of triphenyl. Received the plates have a stable shape and a category of Flammability-2 to DIN 4102, which corresponds to D2 GOST 30244-94. Strength properties are not specified.

The known method has the disadvantage that the content of the flame retardant in the plates too high, which may affect the ability to foaming of PS and strength PPP, plates, especially on the Flexural. It is known [proceedings of ANPA "Plastpolymer", Leningrad, 1985.] that a high content of flame retardant self-extinguishing compositions become brittle.

The closest, the essential features of the claimed method is a method phasename the way PS is mixed with a flame retardant, the mixture is melted in the extruder, the melt is injected foaming agent and ekstragiruyut PPP through a flat die plate with a molded sheet with a thickness of 20 mm or more. As a flame retardant use of 0.2-5 wt.%. hexabromocyclododecane and 0.01-1 % wt. magnesium hydroxide as a synergistic additive.

However, according to our data, the burning material (PPP) containing HBCD and the hydroxide of the metal as a synergistic additive, accompanied by a significant (40%) weight loss, intensive education burning drops and destruction of material.

The technical objective of the present invention is to obtain self-extinguishing expanded polystyrene foam slabs having a Flammability category of G1 and retaining high strength properties.

This task is solved in that in the method of obtaining self-extinguishing foam plates, comprising a mixture of polystyrene with the flame retardant hexabromocyclododecane and synergistic additive, the melting of the mixture in the extruder, introducing a melt of a pore-forming and extrusion through a flat die plate with forming panoplie, as a synergistic additive injected a mixture of tri-(2,4-ditretbutyl)phosphite with octadecyl-3(3,5-ditretbutyl-4-hydroxyaspartate polystyrene of different molecular weight, better high molecular weight (melt flow index of 2.0 to 3.5 g/10 min), such as polystyrol C BASF, etc.

Hexabromocyclododecane take in the amount of 1-5% by weight of polystyrene, better 1.5 to 2.5 wt.%

As pore-forming substance use diperchlorate (freon 22), diperchlorate (freon V) or their mixture, or mixtures of these compounds with carbon dioxide (CO2), taken in an amount up to 10% by weight of blowing agent. The amount of the pore-forming equal to 5-15%, mostly 7-10% by weight of the mixture.

In addition to the pore-forming, extrudable mixture contains nucleator on the basis of talc, such as coarse-grained talc (average particle diameter 110-120 Ám) fine or better, with an average diameter of {dispersion) particles 3-10 microns, taken in an amount of 0.2 to 1.5% by weight of the boot. Can also be used as nucleator mixture of fine talc and 0.01-0.06% of the mass loading of aluminum hydroxide. Nucleator mixed with polystyrene before loading it into the extruder.

A mixture of tri-(2,4-ditretbutyl)phosphite with octadecyl-3(3,5-ditretbutyl-4-hydroxyphenyl)propionate in the ratio of 4:1 is issued by the industry under the name of Irganox is Umerov.

Information about how to use make up V as antiperiodic additives are missing.

Further, the inventive method is illustrated by examples.

Example 1.

In the amalgamator 97,18% polystyrene with a melt flow index of 3 g/10 min, 0.3% of talc, 0.015% hydrate of aluminum oxide, 2.5% of hexabromocyclododecane and 0.005% make up W. The mixture at the rate of 400 kg/h is fed into the twin screw extruder with a screw diameter of 150 mm In the first zone of the extruder the mixture is melted at a temperature of 200-240oWith, then at a temperature of 65-85oWith the melt is mixed with the blowing agent is a mixture of freon V and freon 22, taken in the ratio of 60:40. The melt containing additives and a blowing agent, homogenized in an extruder at a temperature of 90-150oWith, pressed through a flat die plate at a temperature of 110-70oC. the Plates are formed with a thickness of 30 mm to 60 mm in increments of 10 mm and a width of 600 mm

The obtained plate was tested on the following parameters:

density in kg/m3according to GOST 17177-94, the limit of compressive strength and static Flexural in MPA according to GOST 17177-94 and resistance to burning GOST 30244-94.

The composition of the processed mixture and fisico-mechanical parameters given the t 97,48% polystyrene with MFR: 2.5 g/10 min, 2.2% of HBCD and 0.005% make up W. The composition and properties of the processed mixture and physico-mechanical properties of the plates shown in the table.

Example 3.

The plates get as in example 1, but take polystyrene with a MFR of 2 g/10 min. The composition of the processed mixture and physico-mechanical parameters are shown in table.

Example 4.

The plates get, as in example 1, but take 0.01% hydrate of aluminum oxide and 0.01% make up W.

Example 5.

The plates get, as in example 1, but take cholesterol with MFR: 3.5 g/10 min, 0.5% of talc, 0.01% hydrate of aluminum oxide, 2% of hexabromocyclododecane and 0.01% make up W.

Example 6.

The plates get, as in example 1, but take 96,84% polystyrene with MFR: 3.5 g/10 min, 1.5% of talc, 0.06% of the hydrate of aluminum oxide, 1.5% of hexabromocyclododecane and 0.1% make up W.

Example 7.

The plates get, as in example 1, but take 95,99% polystyrene with MFR: 3.5 g/10 min, 1.5% of talc, 2.5% of hexabromocyclododecane and 0.01% make up W.

Example 8.

The plates get as in example 7, but take polystyrene with MFR of 4.5 g/10 min.

Example 9.

The plates get as in example 6, but take polystyrene with MFR: 7.0 g/10 min.

Example 10. The plates get how on Fri, as in example 1, but do not enter Irganox B.

Example 12 (control).

The plates get as in example 5, but do not enter Irganox B.

Example 13 (control).

The plates get as in example 6, but do not enter Irganox B.

Example 14 (control).

The plates get as in example 10, but do not enter Irganox-900.

As can be seen from the table, the introduction of the inventive synergistic additives in obtaining self-extinguishing foam plates, allows to achieve a measure of resistance to burning G1. The resulting material gives no burning droplets during combustion; when removed from the flame self-extinguishes in less than 2 C. Comparison of physico-mechanical properties: density, compressive strength and Flexural shows that the synergistic additive prevents foaming and does not reduce the strength of peoplet.

1. A method of obtaining a self-extinguishing foam plates, comprising a mixture of polystyrene flame retardant-hexabromocyclododecane and synergistic additive, the melting of the mixture in the extruder, the introduction into the melt blowing agent and extruding the mixture through a flat die plate with forming panoplie, characterized in that as synergeia, taken in the ratio of 4: 1, in the amount of 0.005-0.1% of the mass of extrudable mixture, and the extrusion is carried out in the presence of nucleator on the basis of talc.

2. The method according to p. 1, characterized in that use polystyrene polystyrene with a melt flow index of 2.0-3.5 g/10 min.

3. The method according to p. 1, characterized in that as nucleator use a mixture of talc with dispersion particles 3-10 microns in an amount of 0.2 to 1.5% by weight of the mixture and aluminum hydroxide in an amount of 0.01-0.06% of the mass of the mixture.

 

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