DE2148186C3 - Molding compounds based on ethylene-vinyl acetate copolymers and pitch and their use for the production of insulating foils - Google Patents

Description

will. Examples of stabilizers are polycarbodiimides, Vinyl naphthalenes and alkylated phenols.

As fillers, for. B. soot, chalk, kaolin, quartz powder, kieselguhr, talc, barite and as processing aids do B. waxes, factice, coumarone resins and stearic acid in question.

example 1

Mixtures were produced from the following constituents on a roller at 120 ^° C. and their properties were checked.

Ethylene-vinyl acetate copolymer 1) Ethylene-propylene terpolymer 2) Thermoplastic rubber 10)

Suspension PVC with dibutyl phthalate 6)

Pitch EP 160 ⁰ C
Hardness Shore A 23 °

40 °

60 °

Freezing temperature
Clash-Berg (DIN 53 447) T _F Tear strength kp / cm ² Elongation at break%
Tear strength kp / cm

100 80 80 100 - 20th - - - 20th - - - - 30th 100 100 100 100 62 68 79 69 45 52 63 54 23 36 43 31 -16 ° C -24 ° C -23 ° C -21 ° C 60 29 51 45 240 360 480 270 21 15th 21 20th

It is found that the addition of component C improves the heat resistance and the Freezing temperature is lowered.

Example 2

A homogeneous mixture of pitch, ethylene-vinyl acetate copolymer was formed on a roller at 150 ° C and polyethylene. For comparison, a mixture without polyethylene was also made.

Ethylene-vinyl acetate copolymer 1) 100 100 low-pressure polyethylene

Density 0.947 20 -

Pitch EP160 ° 100 100

Shore A hardness 23 ° 83 62

40 ° 71 45

60 ° 43 23

It turns out that the Shore A hardness of the mixture with polyethylene is much better.

The cold resistance was also good. A 1 mm thick film of the composition described above can be bent around a mandrel with a diameter of 20 mm within 3 seconds at - 10 ° C, without a cold break occurring.

Another advantage is that component C reduces the heat shrinkage. A film which consisted only of VAE and pitch and was prepared on a pilot calender, had esnen shrinkage of 6% at 80 ⁰ C. After adding 20 percent by weight of PE, the shrinkage at 80 ° C. fell to 0.5% under the same calender conditions.

Example 3

On a mixing roll mill, homogeneous mixtures were produced from the constituents indicated below ^{at 160 ° C. and their properties were tested.}

Ethylene vinyl acetate copoly 100 80 80 80 100 mer 1) Pitch EP 160 ⁰ C 100 100 100 100 100 Ethylene-propylene terpolymer 2) - 20th - - - Polychloroprene rubber 3) - 20th - - Acrylonitrile rubber 4) - - - 20th - Suspension PVC 5) - - - - Suspension PVC with dibutyl - - - 20th phthalate 6) Chlorosulfonated polyethylene 7) - - - - Epoxy resin 8) - - ■ - - - Polyurethane plasticizer 9) - - - - - Thermo-elastic chewing -

80 80 80 75 80
100 100 100 100 100

10 _ _ - -

- 20 - - -

C.

10 - - - -

_ _ 20 - -

Polyurethane rubber 11)

Acrylonitrile butadiene rubber 12)

zinc oxide
Stearic acid
Tear strength kp / cm ²
Elongation at break%
Tear strength kp / cm
Shore A 23 °

60 °

80 °

Cold stroke (according to Williams, ICI)

The components listed in Examples 1 with 3 and their manufacturers.

1) ethylene-vinyl acetate copolymers to from Wacker-Chemie with 60% vinyl acetate and a melt index / ₅ -. 0.25.

2) Ethylene-propylene terpolymer from Montecatini, Mooney viscosity ML-4 69.

3) Polychloroprene rubber from Bayer, Mooney viscosity ML-4 95-110.

4) Acrylonitrile rubber from Bayer. 28 " _o acrylonitrile, ML-4 65 ± 7.

5) Suspension PVC from Wacker. K value 70. stabilized with 2 parts lead phthalate and 2 parts lead stearate 51%.

6) Suspensio.is-PVC from Wacker, K value 70,

- 25 - -

- - - 20

3 - 3 3 - - 3 - - 3 0.5 0.5 0.5 0.5 0.5 1 1 0.5 1 1 55 35 60 49 45 51 42 46 62 51 390 360 470 575 270 170 180 480 340 430 25th 20th 34 26th 20th 25th 21 21 33 29 73 75 80 77 75 84 76 80 96 80 30th 39 47 38 34 56 44 44 59 50 <20 <20 <20 <20 <20 28 24 <20 43 21 -5 -15 -10 -10 -10 -10 -10 -15 -10 -10

stabilized with 2 parts lead phthalate and 2 parts lead stearate 51% + 50 parts dibutyl phthalate.

7) Chlorosulfonated polyethylene from Du Pont. Mooney Viscosity ML-4 30.

8) Shell epoxy resin.

9) Polyurethane plasticizers from Bayer.

10) Thermoplastic rubber, block polymer of butadiene, styrene from Shell. Melt index at 5 kg load and 200 ^c C 22 g / 10 min.

11) Thermoplastic polyurethane rubber from Bayer.

12) Acrylonitrile-butadiene rubber from Goodrich, with about 31 weight percent acrylonitrile. 5 percent by weight acrylic and methacrylic acid. Mooney viscosity ML-4 35-60.

Claims (1)

ι ■;, ■ ■ -... * temperature resistance, as their freezing temperature is lower Claim: lies than with previously known pitch-polymer mixtures gen. At the same time, the molding compounds also have a Molding compounds for the production of insulating foils, high heat resistance. They continue to show a based on ethylene-vinyl acetate-Co- 5 elastic behavior in contrast to the known polymerizaten and pitch, consisting of molding compounds that have a plastic tensile strain hold exhibit. A. 20 to 70 percent by weight coal tar pecb Particularly suitable are the molding compounds for Hermit a softening point from SO to position of insulating films, such as. B. roofing membranes and 200 ⁰ C according to DlN 1995, io foils for building waterproofing. That’s where they come B. 10 to 85 percent by weight ethylene-vinyl particularly advantageous properties of the molding compounds acetate copolymer fiiit a vinyl acetate to wear. Due to the high heat resistance, gke, t proportion of 30 to 80 percent by weight, the foils can be laid in hot bitumen and " _F .. _m ". ,. * \ ii stay tough enough to even when exposed to sunlight C. 5 to 50 percent by weight thermoplastic _{to allow} . _{On the other} lateral deformable polymers whose Einfner- _Folicn ^B £ ^ i _{also standard and even} altemperatur ^ ₁ harbors temperature below 30 ⁰ C, and ^ _{n outdoor temperatures} are _I g _genu to a D. if necessary, the usual fillers to ensure stability and easy handling. There are also lizers and processing aids. _{the foils can be} swell welded, weatherproof ao (ozone and light stable) and have fungicidal properties. In addition, the molding compounds are z. B. also as an anti booming compounds, groundwater protection coatings, casting compounds and can be used for the production of moldings as. It is known that by mixing pitch with the molding compounds are obtained by mixing together Polymeric molding compounds with good mechanical properties while increasing the temperature of the individual components to manufacture. However, these are not nenten, for example, on a mixing mill, a all polymers are suitable, for example poly-stamp kneader, an inner or a screw ethylene With pitch very brittle products, on the other hand manufactured as segregated products. The order of addition of the consists of ethylene-propylene-diene rubber and pitch components are irrelevant. The temperature a mass that has no strength. during the mixing process is mostly in the melting In the DT-AS 12 31006 molding compounds from the area of thermoplastically deformable polymers 0.1 to 75 percent by weight pitch and 25 to 99.9 Ge (component C). Weight percent ethylene-vinyl acetate copolymer 35 As coal tar pitch (component A) can with a vinyl acetate content between 5 and 50 commercially available products that are made from stone weight percent by distillation described. Such mixtures coal tar were obtained who have used good mechanical properties. However, the. Molding compounds required the higher thermal loading The softening temperatures, determined according to DIN to withstand loads, 40 1995 must not be below 80 ° C and pitch with a high softening point must not be used. higher than 200 ^° C., preferably between 100 and 100.degree. C. However, molding compounds are formed which are very hard. 195 ° C, otherwise the mechanical values will have a Shore A hardness of over 90 and the mixtures will deteriorate,
films made from it are at normal tem- The component B consists of copolymers of the Peiratures stiff. Such films show a good 45 ethylene with vinyl acetate, the vinyl content being thermal Stability (e.g. when laying in hot acetate 30 to 80 percent by weight, preferably 40 Bitumen or under solar radiation), which it amounts to as up to 70 percent by weight. These are manufactured Make roofing membrane suitable, however, their polymers are often made by known processes Difficult to lay because of its rigidity. rakical emulsion polymerizations, e.g. B. according to There have now been molding compositions, in particular for the manufacture of 5 »DT-PS 1133 130 or US-PS 35 63 963, such as e.g. Positioning of insulating foils based on the copolymers VAE types from Wacker-ethylene-vinyl acetate copolymers and Pechge Chemie GmbH. The quantities used can be varied within wide limits. .- ", .__"., Ο ·, ■ ·. As thermoplastically deformable elastomers, grain A. 20 to 70 percent by weight of coal tar pitch _{55 mz B Natural rubber} , synthetic rubber, both FNZ Erwe, Chung _S point of 80 200 ° C bs _{game as} ethylene-propylene, ethylene -propylene nacn um lvvs, ^ _dien ^ _{acrylonitrile} . Butadiene-styrene-, acrylonitrile-Bu- B. 10 to 85 percent by weight of Ethylen-Vmylacetat- mdien-StyroI-, isoprene, chloroprene and ethylene copolymensate with a vinyl acetate content of 30 vinyl chloride rubber in question, as thermoplastics, up to 80 percent by weight, _{6o z} . ß. Polyethylene, polyvinylchloride, plasticized C. 5 to 50 percent by weight thermoplastic, polyvinyl chloride, polyvinyl chloride plastisols, polyformables Polymers, their frozen styrene. Polyethylene or Buratur are preferred is below -30 C, and tadiene-styrene rubber is used. The addition of the D. if necessary, the usual fillers, stabilizing component C in amounts of 5 weight ^{factors and processing aids 6} % already bring about improvements, mostly will be Amounts of 10 to 30 percent by weight are used. The molding compositions according to the invention show, in addition to the molding compositions, can also stabilize uter tear strength and tensile strength, improved low-tensioners, fillers, and unc. Processing aids added