SU905231A1 - Composition for producing foamed polyurethane - Google Patents

Description

The invention relates to the preparation of a polyolefin composition which can be processed into foam plastic by means of extrusion. The closest to the technical essence of the present invention is a composition for obtaining a foamed polyolefin containing polyolefin, azodicarbonamide and a blowing agent decomposition activator consisting of a mixture of oxyzinc, zinc stearate and stearic acid, taken in a weight ratio of 1: 3 respectively 1 TO 1.5: 5: 3 in the following ratio of composition components, parts by weight: polyolefin 100, azodicarbonamide 5-8, activating agent for decomposing a foaming agent 2, However, the indicated ratio of components for decomposing activator is foam The cooling agent does not allow to obtain a foam with good physicomechanical properties based on polyethylene waste. The purpose of the invention is to provide the possibility of obtaining foam based on polyolefin waste. The goal is achieved by the fact that in a composition for producing a foamed polyolefin containing a polyolefin, azodicarbonamide and a blowing agent decomposition activator consisting of a mixture of zinc oxide, zinc stetosate and stearic acid, taken in a weight ratio of 1: 311 to 1, 5: 5: 3 polyethylene waste is used as a polyolefin, and a mixture of zinc oxide, zinc stearate and stearic acid is taken in a weight ratio of StS0, 5: 2 to 6.5: 1.5: in the following ratio of composition components, weight. including: waste polyethylene and a mixture of zinc oxide, zinc stearate and stearic acid 100

Azodicarbonamide 2 decomposition activator

foaming agent 2 Such a ratio of components 3i (i willow is a mountain of decomposing foaming agent allows to obtain an even shallow cellular foam and thereby improve the physicomechanical properties of polystyrene based on polyethylene waste. At that, the content of 1 is less wt. h The indicated weight ratio to (-1 components of the decomposition activator of the decomposing agent ensures the reduction of the decomposition temperature of azodicarbo, namida, while the speed is 1; The eatery remains constant in the temperature range C. This is illustrated by the graphical dependence of the foam multiplicity on the temperature of the material. 06i eC;:; HOUR CONSTANT GROWTH RATE Pv: ii.i, i .... View of the straight-line section (CM. Drawing). Also creeps are given for a known composite primary poly. .. for a composition based on polyethylene that does not contain v.jp decomposition of azodicarbon P r and ne

SOSiMi-i ,, weight. m ; Polyethylene waste Azodicarbonamide Zinc zinc stearag zinc / gearic acid

Polyethylene waste has a melt flow index of 0.11 g / 10 min, gel fraction 37-, the molecular weight of the soluble part.

The composition is prepared by mixing on rollers at 115-120С for 1 o mi, and heating in a mold with a size lOOx х400х20 mm under a press pressure of 8.0-8.5 MPa at 160-165 ° С. Foaming occurs in the air after relieving pressure and opening the mold.

PRI mme R 2. The composition of the composition, by weight.h .:

Polyethylene waste

00

Azodicarbonamide

2

1,375

Zinc oxide

0.125

Zinc Stearate

Stearic acid

0.5

Polyethylene waste has a melt flow index of 0.01 g / 10 min gel fraction, the molecular weight of the soluble part is 23100.

The composition is prepared by mixing in a screw mixer at 115-120 ° C. Heating and foaming of the material is carried out as in Example 1.

PRI me R 3. The composition consists of, weight. including:

Polyethylene waste 100

Azodicarbonamide 4

Zinc Oxide2,

Zinc Stearate

Stearic acid 1,320

Polyethylene waste has a melt flow index of 0.21 g / 10 min. Gel fraction is 17%, the molecular weight of the soluble part is 32500.

The composition is prepared and foamed as in Example 1.

Properties of the foam obtained

in examples 1-3 / are shown in the table.

Average cell size

in to

/ 3

Volumetric VeS) kg / m

y.1: an energizing voltage

0,53 rost Kenya, MN / m

f: -1g; -c i-i Gel h my is for DLi 156;:;.: e at break,

18

179 96 61 59

0.6 "

0.65

1.20

0.3-0.5

YU

1M

Claims (1)

0.052 0.061 0.12 0.15 As can be seen from the table, the properties of the foam based on polyethylene waste correspond to the properties of the foam obtained on the basis of the primary raw material, and are significantly superior in properties to the foam obtained in Examples 1-3. Thus, this invention makes it possible to significantly increase the physical mechanical properties of polystyrene based on polyethylene waste (by 1.5–4 times), to expand the field of application of polyethylene waste, and also to eliminate scarce primary polyethylene. DETAILED DESCRIPTION OF THE INVENTION A composition for producing a foamed polyolefin comprising a polyolefin, azodicarbonamide and a blowing agent decomposition activator composed of a mixture of zinc oxide, zinc stearate and stearic acid. Table continuation 0.056 0.058 0.055 0.10 0.09 0.11 CONSUMED in a weight ratio of from 1: 3: 1 to 1.5: 5: 3, respectively, in order to ensure the possibility of obtaining a foam based on the waste, polyolefin, it contains polyethylene waste and a mixture of zinc oxide, zinc stearate and stearic acid as a polyolefin in a weight ratio of 5.5: 0.5: 2 to 6.5: 1, with the following ratio of components of the composition, parts by weight: Polyethylene waste and a mixture of zinc oxide, zinc stearate and stearic acid Azodicarbonamide blowing agent decomposition activator Sources For information, received into account in the examination 1. USSR Author's Certificate 526,631, cl. C 08 L, 1973 (prototype).