Compositions of expandable vinyl aromatic polymers with an improved thermal insulation capacity, process for their preparation and expanded articles obtained therefrom
A vinyl aromatic, polymer technology, applied in the field of foamable vinyl aromatic polymer compositions, to achieve the effect of saving space and products
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Embodiment 1
[0087] Will be made of 150 parts by weight of water, 0.2 parts of sodium pyrophosphate, 100 parts of styrene, 0.25 parts of tert-butyl peroxy 2-ethylhexanoate, 0.25 parts of tert-butyl perbenzoate and 1 part of calcined A mixture of coke 4023 sold by the company Asbury Graphite Mills Inc. (USA) with a mean diameter MT50% of about 5 μm and a BET of about 20 m was poured into a closed stirred vessel. 2 / g. The mixture was heated to 90°C with stirring.
[0088] After about 2 hours at 90° C., 4 parts of a 10% solution of polyvinylpyrrolidone were added. Still with stirring the mixture was heated to 100°C for a further 2 hours, 7 parts of a 70 / 30 n-pentane / isopentane mixture were added and the whole was heated to 125°C for a further 4 hours and then allowed to cool , discharge the batch of product.
[0089] The thus-produced expandable polymer pellets were subsequently collected and washed with deionized water containing 0.05% of a nonionic surfactant composed of fat condensed w...
Embodiment 2
[0098] Will be made of 150 parts by weight of water, 0.2 parts of sodium tricalcium phosphate, 100 parts of styrene, 0.25 parts of tert-butyl peroxy 2-ethylhexanoate, 0.25 parts of tert-butyl perbenzoate, 0.01 parts of A mixture of sodium metabisulfite and 2 parts of the coke used in Example 1 was poured into a closed stirring vessel. The mixture was heated to 90°C with stirring.
[0099] After about 2 hours at 90°C, the mixture was heated to 100°C and held for a further 2 hours, 7 parts of a 70 / 30 mixture of n-pentane and isopentane were added and the mixture was heated to 125°C for a further 4 hours , then cool and discharge.
[0100] The expandable polymer pellets thus obtained are processed as in Example 1, and a fraction with a diameter of 1-1.5 mm is separated off.
[0101] It was confirmed that this fraction accounted for 60%, the 0.5-1 mm fraction accounted for 25%, the 0.2-0.5 mm fraction accounted for 5%, and the 1.5-3 mm coarse fraction accounted for 10%.
[0102...
Embodiment 3
[0105] Will be made of 150 parts by weight of water, 0.2 parts of sodium tricalcium phosphate, 100 parts of styrene, 0.30 parts of tert-butyl peroxy 2-ethylhexanoate, 0.25 parts of tert-butyl perbenzoate, 0.01 parts of A mixture of sodium metabisulfite and 4 parts of the coke used in Example 1 was poured into a closed stirring vessel. The mixture was heated to 90°C with stirring.
[0106] After about 2 hours at 90°C, the mixture was heated to 100°C for a further 2 hours, 7 parts of a 70 / 30 n-pentane / isopentane mixture were added and the mixture was heated to 125°C for a further 4 hours , then cool and discharge.
[0107] The expandable polymer pellets thus obtained are processed as in Example 1, and a fraction with a diameter of 1-1.5 mm is separated off.
[0108] It was confirmed that this fraction accounted for 60%, the 0.5-1 mm fraction accounted for 25%, the 0.2-0.5 mm fraction accounted for 5%, and the 1.5-3 mm coarse fraction accounted for 10%.
[0109] 0.2% glyceryl ...
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Abstract
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