CS200093B1 - Mixtures of plastified polyvinyl chloride and method for their preparing - Google Patents

Description

The invention relates to a mixture of polyvinyl chloride which contains 1 to 200 parts by weight of plasticizer per 100 parts by weight of polyvinyl chloride. The invention further relates to a process for the preparation of these compositions.

Atactic polypropylene is produced in a certain amount in the production of polypropylene. Routine processing is unusable, and is therefore being sought for alternative use. Currently, some of this waste is used in asphalt mixtures for construction and in impregnating materials. Further use is possible in mixtures with petroleum products as sound insulation material for the automotive industry. Of great importance is the use of atactic polypropylene as a part of adhesives with adhesion time, rapid drying and good low temperature resistance. Its use in rubber mixtures is also known. However, all of these applications are partially verified if used to an extent that does not cover the entire amount of material produced. Most of the atactic polypropylene is therefore still disposed of.

Its use in thermoplastic mixtures as a filler or lubricant has been tested. These attempts have not been successful because atactic polypropylene cannot be homogeneously combined with a blend of, for example, polyvinyl chloride, either by rolling or mixing in a kneader. When processed on a calender, the material is adhered to the rollers, it does not disperse perfectly in the mixer. Workability was not significantly improved even by the relatively costly removal of low molecular weight particles, especially water. Radiation treatment of atactic polypropylene has also been described to allow its use

200 093

200 003 as a modifying agent for polymers.

It has now been found that high-quality plasticized polyvinyl chloride mixtures can be prepared which comprise from 1 to 50, preferably from 5 to 15, parts by weight of atactic polypropylene per 100 parts by weight of plasticizer. Said blends, in which up to 50% of the initially dosed beacon grains, have equivalent properties in terms of mechanical strength, deformation, and elasticity. In some cases, the low temperature resistance and the plasticizer migration are even better than those without atactic polypropylene and the softening effect is also at least at the same level.

A prerequisite for the applicability of these mixtures is, however, a suitable technology for their preparation which has not been known to date due to the poor dispersibility of atactic polypropylene in polyvinyl chloride.

According to the invention, the compositions can be prepared by a process comprising first mixing the plasticizer, for example dioctyl phthalate, with atactic polypropylene at a temperature of 100 to 250 ° C, and mixing the polypropylene solution or dispersion in a conventional manner with polyvinyl chloride and other components of the mixture . At a temperature of 100 to 250 ° C, a solution or dispersion of atactic polypropylene in conventional plasticizers such as dioctyl phthalate containing up to 50% by weight of polypropylene can be readily prepared with stirring. The viscosity of the prepared solutions or dispersion depends on its concentration. In view of the ease of handling, it is particularly advantageous to prepare solutions or dispersions having a polypropylene concentration of up to 10% which are liquid at normal temperature, so that they can be easily pumped during operation. Solutions with a higher polypropylene content are pasty and must be handled differently.

In order to further elucidate the invention, the following examples are provided: Preparation of atactic polypropylene:

The dioctyl phthalate was heated to 150 ° C with stirring. After reaching this temperature, 10% by weight of polypropylene was metered in with continued stirring. Upon cooling, a viscous liquid was prepared ready to be dispensed into the polyvinyl chloride mixtures.

Example 1

Two blends of plasticized polyvinyl chloride (in parts by weight) were mixed on a two-roll calender:

A: Polyvinylohlorid 100

Dioctyl phthalate. 34

Thermal stabilizer (Sn organocomplex) 1

B: Polyvinyl chloride chloride 100

10 # nl solution of atactic polypropylene in dioctyl phthalate 34 Thermal stabilizer (Sn organocomplex) 1

The blends were rolled for 10 minutes at 160 ° C. The prepared films of 0.5 mm thickness were smooth and, in the case of formulation B, milky. The thermal stability was in both foils

200 003 comparable. Compositions prepared according to Formulation B exhibited a higher degree of softening than mixtures A. Other properties such as tensile strength, ductility, and frost resistance are comparable for both směsi and 3.

Example 2

To the dioctyl phthalate heated to 110 ° C, 10 wt% of atactic polypropylene was added with stirring, and the resulting liquid was used to prepare a mixture of polyvinyl chloride 8.

Polyvinyl chloride pastes having the following composition (in parts by weight) were prepared in a high speed mixer at 500 rpm for 5 minutes:

A: Tolyvinyl chloride 100

Dioctyl phthalate 60

Thermal stabilizer based on organocomplex Ba-Cd-Zn 2

B: Polyvinyl chloride 100

10% ni solution of atactic polypropylene in dioctyl phthalate 60

Thermal stabilizer organocomplex Ba-Cd-Zn 2

Foils of 0.5 mm thickness were prepared from the pastes by coating them on a reverse pad and gelling at 160 ° C for 10 min. The prepared films showed the same degree of softening, other properties, such as tensile strength, ductility are comparable. The softener migration for mixture B was lower than for mixture A.

Example 3

In a rapid mix, polyvinyl chloride pastes having the following composition (in parts by weight) were prepared at 500 rpm for 5 minutes:

A: Polyvinyl chloride 100

Dioctyl phthalate 80

Azodicarbonamide (batch 1: 1 in dioctyl phthalate) 4

Activator Cd-Zn organocomplex 2.5

B: Polyvinyl chloride 100

10% nl solution of atactic polypropylene in dioctyl phthalate 80

Azodicarbonamide (batch 1: 1 in dioctyl phthalate) 4

Activator Cd-Zn organocomplox 2.5

The pastes were applied to 0.5 mm reverse paper, gelatinized and expanded at 195 ° C for 1.5 min. The structure of the expanded foils was identical, the density, the permanent deformation and the structural strengths in the mixture A and B were comparable.

Claims (2)

SUBJECT OF THE INVENTION Mixtures of plasticized polyvinyl chloride, containing per 100 parts by weight of polyvinyl chloride 1 ai. 200 parts by weight of plasticizer and other conventional additives, characterized in that they contain, on an ICC, parts by weight of the plasticizer used of from 1 to 50, preferably from 5 to 15, parts by weight of atactic polypropylene. 2. A method according to claim 1, wherein a plasticizer, such as dioctyl phthalate, is first admixed with atactic polypropylene at a temperature of 100 DEG to 250 DEG C. and the polypropylene solution or dispersion is mixed with polyvinyl chloride and other components in a customary manner. mixtures.