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Expandable vinyl aromatic polymers

A vinyl aromatic, polymer technology, applied in the direction of thermal insulation, building components, etc., can solve problems such as the pressure resistance of insulation boards that are not mentioned

Inactive Publication Date: 2013-08-21
TOTAL RES & TECH FELUY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no mention of the insulation board obtained and its resistance to compression

Method used

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  • Expandable vinyl aromatic polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Example 1: Reference, MFI=7

[0089] Will contain 99 parts of polystyrene (Mw=170Kg / mol, polydispersity index (PI)=2.3) and 1 part from A mixture of talc is fed into the extruder. 6% by weight of pentane (80 / 20 n-pentane / iso-pentane) was injected into the extruder through a special line. According to DIN ISO 1133, the melt has a melt flow index equal to 7 g / 10 min. The sample was finally pelletized with an underwater pelletizer at the die outlet. The recovered beads (with a diameter in the range of 0.3-2 mm) are then coated with a coating agent such as zinc stearate and optionally with glyceryl monostearate, glyceryl distearate or glyceryl tristearate Ester treatment. The treated beads were pre-expanded with steam at 100°C, left to age for 1 day, and finally used to mold panels. After 1 day, the density of the board (determined by weighing the board and measuring its dimensions) was 19 g / l. After aging for at least 30 days, the samples were subjected to a compre...

Embodiment 2

[0090] Embodiment 2: reference, MFI=8.5

[0091] Will contain 99 parts of polystyrene (Mw=155Kg / mol, PI=2.2) and 1 part from A mixture of talc is fed into the extruder. 6% by weight of pentane (80 / 20 n-pentane / iso-pentane) was injected into the extruder through a special line. According to DIN ISO 1133, the melt flow index of this melt is equal to 8.5 g / 10 min. The sample was finally pelletized with an underwater pelletizer at the die outlet. The recovered beads (with a diameter in the range of 0.3-2 mm) are then coated with a coating agent such as zinc stearate and optionally with glyceryl monostearate, glyceryl distearate or glyceryl tristearate Ester treatment. The treated beads were pre-expanded with steam at 100°C, left to age for 1 day, and finally used to mold panels. After 1 day, the density of the board (determined by weighing the board and measuring its dimensions) was 19.1 g / l. After aging for at least 30 days, the samples were subjected to a compression te...

Embodiment 3

[0092] Embodiment 3: According to the present invention, PS+0.5%PiB MFI=8.5

[0093] Expandable beads were produced under the same conditions as described in Example 1, except that the initial mixture contained 98.5 parts of polystyrene (Mw=170 Kg / mol, PI=2.3), 1 part from of talc and 0.5 part of polyisobutylene Glissopal 1000 from BASF. Glissopal 1000 is a polyisobutylene with an Mn of 1000. According to DIN ISO 1133, the melt flow index of this melt is equal to 8.5 g / 10 min. The panels obtained after the pre-expansion and molding steps had a density of 19.9 g / l. After aging for at least 30 days, the samples were subjected to a compression test. The stress value at 10% deformation evaluated according to EN826 standard is 117.3kPa.

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Abstract

The present invention is an expandable vinyl aromatic polymer which comprises: a ) a matrix of a vinyl aromatic polymer, b ) 1-10% by weight calculated with respect to the polymer (a), of an expanding agent englobed in the polymeric matrix, c ) 0.1 to 5% by weight calculated with respect to the polymer (a), of PiB (polyisobutene), homogeneously distributed in the polymeric matrix, d ) 0-20% by weight, calculated with respect to the polymer (a), of one or more fillers, other than PiB, homogeneously distributed in the polymeric matrix, Wherein the proportion of PiB is adjusted to increase the Melt Flow Index (MFI) from an initial index to a final index such as the 10% compression strength of the foam made with said expandable vinyl aromatic polymer of the final index is essentially the same or higher than the foam made with said expandable vinyl aromatic polymer of the initial index. The expandable vinyl aromatic polymer of the invention is produced in the form of beads or granules. In an embodiment the expandable vinyl aromatic polymer comprises carbon black in a proportion sufficient for the foamed material obtained from the expandable vinyl aromatic polymer to have a thermal conductivity [lamda] of about 34 mW / m DEG K or lower.

Description

technical field [0001] The present invention relates to expandable vinyl aromatic polymers having enhanced thermal insulation capabilities and comprising polyisobutylene (PiB). [0002] Expandable vinyl aromatic polymers and among these especially expandable polystyrene (EPS) have been used for a long time for the preparation of polymers which can be employed in various fields of application, the most important of which is the field of thermal insulation. Known products of intumescent articles. These expanded products are obtained by swelling beads of expandable polymer impregnated with gas, and by the simultaneous action of pressure and temperature on the swollen particles contained in a closed mould. Do molding. Swelling of the particles is usually achieved with water vapor or another gas maintained at a temperature slightly above the glass transition temperature (Tg) of the polymer. [0003] A particular field of application of expanded polystyrene is in the field of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/18
CPCC08J9/0061C08J9/0066C08J9/16C08J2203/14C08J2325/04C08J2423/20E04B1/76
Inventor S.诺维P.洛德菲尔L.厄本奇克
Owner TOTAL RES & TECH FELUY