SU603326A3 - Method of forming polymer mixture - Google Patents

Description

(54) METHOD OF FORMING POLYMER MIXTURE

This invention relates to a method of cold forming polybicyclo (2.2.1) -heptene-2 mixtures based on short-chained derivatives thereof.

The invention is applicable in the field of building construction for sound insulation of pipelines and plumbing with respect to slabs and ceilings, the manufacture of loose slabs, the manufacture of connections for sanitary equipment parts; in the field of mechanical engineering and electrical engineering, for the manufacture of casting pillows for light equipment in order to eliminate vibrations; in the field of packaging for film wrapping tools or fragile products.

It is known that polybicyclo- (2,2,1) -hepten-2 and its short-chain derivatives, obtained by substitution, can give elastomeric compositions in mixture with substances with a relatively low melting point, such as esters or hydrocarbons or mixtures with respect to heavy hydrocarbons, if necessary with fillers and vulcanization agents.

The closest in technical essence is a method of molding a polymer mixture by mixing polybicyclo- (2,2,1) -hepten-2 or its derivatives with a compound that lowers the glass transition temperature of the polymer, followed by pressing by casting or molding at a temperature of 140-ISS C 1 .

The aim of the invention is to reduce the casting temperature.

For this, in a known method of forming a polymer mixture, a polymer is used in the form of a powder with an apparent density of 0.2-0.5, preferably in the order of 0.2-0.35. having a particle size of 0.1-3 mm, and a compound that lowers the glass transition temperature of the polymer, take in the amount of SHO 450 weight. hours per 100 weight. including polymer.

According to the invention, thorough mixing of the indicated components is carried out, observing that good flowability is maintained. The resulting mixture is then quickly molded to its gelling. Thereafter, it is allowed to solidify at ambient temperature.

Claims (2)

The duration during which the mass remains sufficiently fluid so that it can be molded and molded depends on the nature and amount of the compound, with a low melting point that lowers the glass transition temperature of the polymer, a heavy hydrocarbon ester. For most applications, an amount of 250-350 parts by weight. compounds with a low melting point per 100 weight.h. Polymer will be particularly beneficial. It is possible to obtain flowable moldable or cast compounds by adding the polymer to the liquid compounds with stirring. In particular, you can pour this polymer on a layer of liquid or this liquid on a thin layer of polymer. In cases where certain mechanical properties of the final product are required, vulcanization agents such as sulfur, accelerators or peroxides, which can cause a transverse gelatinous mass, can be added to the polymer or low melting point either at ambient temperature or during subsequent heat treatment. You can also add fillers, preferably low-absorbing oils, or forgiving the treatment to impart oil resistance to flame retardant preparations, etc. Example 1. In two separate tanks, 200 g of polybicyclo (2.2.1) heptena-2 with apparent density are placed in 0.27 and a particle size of 0.1-0.2 mm and 500 g of petroleum aromatic oil (“Ehago of the French company Rafinaj), the solidification point of which is lower than + 5 ° C and Engler viscosity measured at 50 ° G, 4 -five. Oil is gradually added to the polymer with a spatula with stirring. Immediately after adding the oil, the consistency of the mixture obtained is very fluid, and it changes with increasing viscosity as the oil is absorbed. This process proceeds in such a way that after 2-3 minutes the mixture is still quite well poured into the mold. The mold is a cylinder with a diameter of 100 mm, in which a pipe with an outer diameter of 80 mm is installed in the center. After mixing the components, the fluid mass is poured into the intermediate space of the device for 3 minutes until it is completely filled. The whole system is left for 20 minutes at ambient temperature. Gelation occurs, which continues until complete plasticization. After 20 minutes, a coated pipe with a thickness of up to 10 mm is removed from the mold, which does not stick and has good mechanical properties for removal and rupture. The plasticity of the coating corresponds to the Mooney index at approximately 38-100 ° C. Example 2. The operation is carried out in the same manner as in Example 1, but gradually, while being transferred, the polymer is added to the oil. The same coating is obtained as in Example 1. Example 3. Work as in Example 1, but 2% of sulfur and 2% of sulfenamide accelerator, cyclohexylbenzothiazylsulfenamide, are added to polybicycloheptene in a powder mixer. After solidification of the mass in the form, the coating is dried in a drying oven for 30 minutes at 150 ° C. The coating thus obtained on the pipe is characterized by an increased resistance to cold flow 1C. Example 4. In this example, the application of the proposed method for the manufacture of loose plates in the construction of buildings is considered. A 10 ci concrete panel is applied to the liquid mixture prepared in Example 1 and spread evenly to form a layer 2 mm thick. Full seizure takes about 20-30 minutes, during which the insulating layer of concrete 4 cm thick is poured on top. The thus-obtained unfixed beam type satisfies the minimum attenuation coefficient from the dynamic point of view and 21. Example 5. Powdered polybicyclohepten They are evenly distributed on the slab at the rate of 500 g / m and the oil is sprayed from above using an appropriate pump at the rate of 1250 g / m. The coating thus obtained goes through gelation as gradually as in the previous case. The invention The method of forming a polymer mixture by mixing polybicyclo- (2, 2.P-heptene-2 or its derivatives with a compound that lowers the glass transition temperature of the polymer, followed by casting a mixture, characterized in that, in order to reduce the casting temperature, a polymer having an apparent density of 0, 5 and a particle size distribution of 0 is used, 1-3 mm, and the specified connection is taken in the amount of 100-450 weight.h. per 100 weight parts polymer Sources of information taken into account in the examination: 1. USSR patent 314355, cl. C 08 L 23/20, 1967.