SU753868A1 - Polyvinyl chloride-based composition - Google Patents

Description

one

The invention relates to the production of polyvinyl chloride composites, which are used as insulation material and (shield sheaths of electrical wires and cables, as well as for the manufacture of various sheet products, films, hoses, operated under conditions of elevated temperatures.

It is known that filling is one of the most common methods of creating polymeric materials with a given complex of technological and operational properties.

One of the most common polyvinyl chloride fillers is aerosil 1

A composition based on polyvinyl chloride is also known, containing as a filler a mixture of aerosil and.

Closest to the present invention is a composition based on a polyvinyl chloride, containing, wt.: A plasticizer 6O-80; stabilizer (mixture of basic salts of lead and metal stearates)

6-9; antioxidant-difenshlorpropan-0,3-O, 5; aeprosil.

The use of this composition in the electrical industry is limited for the following reasons. According to the existing technical requirements for wires and cables that have been in use for a long time (several years) in the responsible nodes of devices and devices at high temperatures (105-125 ° C), insulation is necessary, which ensures simultaneous bending in cold at temperatures below minus and retaining this bending capacity (frost resistance) after exposure to high temperatures. The frost resistance of the known composition, especially after heat aging, is insufficient. In addition, oh, the insulation from this PVC composition after its irradiation with the applied amount of aerosil (3-1 O mass parts per 1 GO mass of PVC) does not give gelfraction. However, the absence of gel-phase in the compacted after irradiation with permissible doses (no more than 15–20 Mrad) makes it impossible to use it as a reliable insulation of wires and cables operated at short-term electrical and thermal overloads (i.e. emergency situations). The aim of the invention is to increase the frost resistance of PVC compositions, to maintain it after heat aging and to reduce deformation under load at high temperatures after irradiation. To achieve this goal, a PVC composition containing a plasticizer, stabilizers, antioxidant and aerosil is used as aerosil in the composition of PVC. Aerosil modified by phenylaminomethylenemethyldiethoxysilane form CH AND HsC -O-Si-CH -NC Hg and 11menable AM-2 in the following ratio of components of the composition, mass by weight PVC100 Plasticizer 5O-7t) A mixture of stabilizers5-7, 5 Aerosil modified with phenylaminomethylene methyldiethoxysilane 4-2. About as a plasticizer, I use dioctyl phthalate, ethers of trimellitic and pyromellic acids, etc., and their mixtures. A mixture of basic salts of lead and metal stearates is used as a stabilizer. Diphenylollopropane (DFP) is used as an angioxidant. Below are examples illustrating the invention. Example. In the mixer is stirred at within 45 minutes 1OO mass. including PVC, 6O masses. including didodesh phthalate (DDDF), 1O wt.h. diova-ilsebaccinata (DOS), 7 wt.h. dibasic lead phthalate (DOFTS), 0.5 wt% dibasic cinnamon stearate (DOSS), 4 wt. 4. aerosil modified with phenylaminomethylenemethyldiethoxysilane (AM-2), O, 6 mass.4. Dipheny Oppropana (DFP). The resulting composition is rolled GFE 16O ° C for 3 min under pressure SW kg / cm. Samples were obtained from the obtained film to determine the frost resistance, which was determined on a Klash Berg apparatus. To reduce the strain under load when heated, the composition was irradiated with a dose of 15 Mrad on the РХМ20 unit with Co rays. The magnitude of the gel fraction is determined by separating the crosslinked and soluble fraction of the irradiated plastic product with boiling tetrahydrofuran (TU6-01-2-459-76). The dose of radiation and the properties of the composition are shown in the table. Example 2. The process is carried out as in Example 1, only 10 parts by weight are used. AM-2 and 4.5 weight.h. Dofts. Example 3. The process is carried out as in Example 1, only 20 parts by weight is used. AM-2. Example 4. The process is carried out as in Example 1, only 5O masses are used. h.ZShDF, 7.0 wt.h.dofts, 0.4 wt.h. DFP and 4.0 wt.h.AM-2. From the data in the table it can be seen that PVC compositions containing aerosil as a filler, modified with phenylaminomethylenemethyldiethoxysilane, in an amount of 4-2O mass parts. have a cold resistance of minus 38 - minus 4O C. And the cold resistance of PVC compositions with known fillers (aerosil, chalk, kaolin) is minus 28 - minus 34 C. Thus, the frost resistance is increased by minus 6 - minus 10 C. In addition, the frost resistance of the proposed composition. after heat aging and irradiation is respectively minus 32 - minus 37 and minus, which is significantly higher than frost resistance after heat aging and irradiation of known compositions, which is respectively equal to minus 11 minus 24 C and minus 11 minus 26 C. From the tab The faces also suggest that lltSA compositions on modified AM-2 aerosol, after irradiation, are gelled enough to create a resistant wire and cable against thermomechanical extrusion.

-40

-37

-thirty

S3

-40

-38

-33-30

52

-32-30

56

f The remaining components of the composition are taken as in Example 1.

Table continuation

9753868

The use of modified yarosil (AM-2) makes it possible to create a cross-linked cable plastic without the use of cross-linking agents, which reduces the cost of plastic and reduces its combustibility.

Claims (1)

Invention Formula Polyvinylchloride-based composition containing a plasticizer, a stabilizer-mixture of basic salts of lead and metal stearates, antnoxidant-diphenylolpropane and aerosil, characterized in that, in order to increase frost resistance before and after heat aging and to reduce deformation under load at high temperatures after irradiation, the composition contains aerosil modified with phenylaminomethylenemethyethoxysilane in the following ratio of components, mass, Polyvinyl chloride 100 Plasticizer5O-70 Stabilizer Blend Core ten lead salts to stearag metals Antioxidant-Liphenyl-propane Aerosil modified with phenylaminomethylenemethyl-diethoxysilane Sources of information taken into account in the examination 1, V. Guzeev, et al. Rheological properties of plasticized PVC melts filled with aerosil. Journal of Plastics, f9 3, 1970, with. 25-27. " 2, But T.S.N. et al. The effect of extensions on the resistance of polyvinyl chloride to aging. Collection of works of the All-Union Scientific Research Institute of Building Materials, 1969, vol. 25/33, p. 98-100. 3, USSR Author's Certificate No. 385323, cl. C 08 L 27 / O6, 1973 .(prototype).