SU446522A1 - Antistatic processing method of thermoplastic polymers - Google Patents

Description

The present invention relates to a method for the antistatic treatment of thermoplastic polymers by depositing on the surface or adding to the mass of salts nitrogen-containing heterocyclic compounds. There is a method of antistatic treatment using nitrogen-containing heterocyclic compounds. The proposed antistatic treatment method for thermoplastic polymers (e.g. polyethylene, polystyrene, polypropylene, polybutadiene styrene, polyacrylonitrile butadiene styrene) consists of applying to the surface or introducing into the mass as salts of nitrogen-containing heterocyclic compounds of benzthiazole salts the following formula: CV & where RI is an alkyl radical of Cs-Cis or a naphthenyl radical (naphthenic acid residue); R2 is H, an alkyl radical of Ci-Cs or - (CH2CH2O) xH, where x 1-15; A-C1-, Br-, I-, SOr, SyUG, CH3ZOH, (CH,), PO, -, CeH, 80z or the acyl radical —OCO (CH2) pCH3 (where n 0-16). For example, the obtained samples of low and high density polyethylene according to the proposed method with the introduction of benzothiazole salts into the polymer mass have ps 6, -7, ohms at a temperature of 20 ± 3 ° C and a relative humidity of 65 ± 5% and have a tensile yield strength (at ) 100-245 kgf / cm tensile strength at stretching (ap) 120-140 KGS / CM2 and elongation at break (e%) 160-620%. When surface applied to the polymers of benzthiazole salts by the proposed method, the Ss of the samples is 6.9-10 2.4 oh Ohms at a temperature of 20 ± 3 ° C and a relative humidity of 65 ± 5%. The benzthiazole salts used in the proposed method have enhanced water resistance (not soluble in water) and exhibit a higher antistatic effect when low and high density polyethylene is introduced into the mass compared to the most effective industrial antistatic agents of the type of alkamon that are soluble in water or mixed. with it (ps 3.3-10 ohms and more).

Benzthiazole salts are applied to the surface of polymers from solutions with concentrations of 0.1–3.0 wt. % or injected into the mass of polymers in an amount of 0.1-8.0 weight. %

The introduction of benzthiazole salts into a polymer melt is possible by conventional methods: on rollers, in a Banbury-type plastic mixer or in an extruder.

Example 1. Discs with a diameter of 58 mm and a thickness of 2 mm made of polystyrene are immersed for 20 s in a 3% solution of iodide 3-octylbenzothiazole in acetone and dried at room temperature in a vertical position for 1 day. The PS of samples treated in this way is 1.3-10 ohms at a temperature of 20 ± 3 ° C and a relative humidity of 65 ± 5%.

Example 2. Discs with a diameter of 58 mm and a thickness of 2 mm from polybutadiene styrene are immersed for 20 s in a 3% solution of iodide 3-octylbenzothiazole in acetone and dried at room temperature in a vertical position for 1 day, ps samples processed in this way are 9 , 7-10 Ohms at a temperature and relative humidity of 65dz5%.

Example 3. Disks with a diameter of 50 mm and a thickness of 1 mm made of low density polyethylene are immersed for 20 s in a 3% solution of iodide 3-octylbenzothiazole in acetone and dried at room temperature in a vertical position for 1 day, ps samples processed in this way em 2.4-10 ° ohms at a temperature of 20 ± 3 ° С and relative humidity of 65 + 5%.

Example 4

Disks with a diameter of 50 mm and a thickness of 1 mm made of high density polyethylene are immersed for 20 s in a 2% solution of 2-hydroxyethyl-3-octadecylbenzthiazole chloride in acetone and dried at room temperature in a vertical position for 1 day, ps samples processed in this way is 1.0-10 ohms at a temperature of 20 ± 3 ° C and a relative humidity of 65 ± 5%.

Example 5

Disks with a diameter of 50 mm and a thickness of 1 mm made of polypropylene are immersed for 20 s in a 2% solution of 2-hydroxyethyl-3-octadecylbenzthiazole chloride in acetone and dried at room temperature in a vertical position for 1 day. The PS of samples treated in this way is 6.4-10 Ohms at a temperature of 20 ± 3 ° C and a relative humidity of 65 ± 5%.

Example 6

Discs with a diameter of 58 mm and a thickness of 2 mm from polyacrylonitrile-butadiene styrene are immersed for 20 s in a 2% solution of 2-hydroxyethyl-3-octadecylbenzthiazole chloride in acetone and dried at room temperature in a vertical position for 1 day. 2.7-10 ohms at a temperature of 20 ± 3 ° С and relative humidity of 65 ± 5%. Examples 7-32.

Benzthiazole salts are applied to the surface of polymers as in Examples 1-6. The results are shown in Table. one.

The specific surface resistance of polymers in the surface application

Table I

benzthiazole salts

The properties of polymers with the introduction of salts of benzthiazole in the mass of polymer

table 2