SU449920A1 - Method of imparting antistatic properties to thermoplastic polymers - Google Patents

Description

one

The invention relates to a method of imparting antistatic properties to thermoplastic polymers by applying to the surface or adding imidazoline compounds to the mass.

There is a known method of imparting antistatic properties to polymers by applying to the surface or adding imidazoline compounds to the mass.

To improve the antistatic properties of thermoplastic polymers (for example, polyethylene, polypropylene, polystyrene, polymethylmethacrylate), it is proposed to use beta-derivatives of imidazolines as imidazoline compounds

TO

 J

Lr

N /

NONOS

where R is an alkyl radical of Su-Ci7 or a naphthenyl radical (naphthenic acid residue).

For example, low and high density polyethylene samples obtained by the proposed method, when introducing betaine derivatives of imidazolines into the polymer mass, have QS 1.8–109–4.0.1010 ohm at 204: 3 ° C and relative humidity 65 ± 5% and have a yield strength of (from) 115-240 kgf / cm, tensile strength at stretching (ap) 125-137 kgf / cm and elongation at break (e) 270-600%. When applied by the proposed method of beta-imidazolines to the polymers QS of the samples is 9.5-10-2.0-10 ohms at 20 ± 3 ° С and relative

humidity 65 + 5%. The betaine derivatives of imidazolines used have increased water resistance (they are poorly soluble in water) and have a higher antistatic effect when processing polyethylene.

low and high density, compared with the most effective industrial antistatic agents such as alkamon that are soluble in water or mixed with it (es2.0-10 -l .l-lOi ohm when applied on the surface; 3 dm and more when added to polymer). Beta-derivatives of imidazolines are applied to the surface of polymers from solutions with a concentration of 0.5-3.0 weight. % or injected into the mass of polymers in the amount of 0.5-

4.0 weight %

The introduction of betaine derivatives into the melt of a-polymers is possible by usual methods: on rolls, in Banbury-type plastic mixers or in an extruder.

Example 1. Disks 50 mm in diameter and 1 mm thick from high-density polyethylene are immersed for 20 s in a 2% solution of 2-heptyl-1-hydroxymethyl-1-carboxymethyl-imidazoline betaine in ethyl alcohol and then dried at room temperature in an upright position for 1 day.

The QS of samples treated in this way is 3.0-10 ohms at 20 + 3 ° C and a relative humidity of 65 ± 5%.

Example 2. Disks with a diameter of 58 mm and a thickness of 2 mm from polymethyl methacrylate are immersed for 20 s in a 3% solution of 2-heptyl1-oxymethyl-1-carboxymethyl-imidazoline betaine in ethyl alcohol and then existing at room temperature in a vertical position for 1 day.

The QS of samples treated in this way is 9.0-10 ohms at 20 ± 3 ° C and a relative humidity of 65 + 5%.

Example 3. Disks with a diameter of 50 mm and a thickness of 1 mm of low density polyethylene are immersed for 20 s in a 2% solution of 2-OKTIL-1 - hydroxymethyl-1-carboxymethylimidazoline betaine in ethyl alcohol and then existing at room temperature in a vertical position in for 1 day.

The QS of samples treated in this manner is 2.0-10 ohms at a relative humidity of 65 ± 3%.

Example 4. 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 2-octyl-1-hydroxymethyl-1 carboxymethyl-imidazoline betaine in ethyl alcohol and then dissolved at room temperature in a vertical position for 1 day.

The QS of samples treated in this manner is 1.0-10 ohms at 20 ± 3 ° C and a relative humidity of 65zfc5%.

Example 5. Disks 50 mm in diameter and 1 mm thick made of polypropylene are immersed for 20 s in a 2% solution of 2-nonyl-1-hydroxymethyl-1-carboxymethyl-imidazoline betaine in ethyl alcohol and then dried at room temperature in a vertical position for 1 days

The QS of samples treated in this manner is 1.0-10 ohms at 20 ± 3 ° C and a relative humidity of 65 + 5%.

Example 6. Disks with a diameter of 50 mm and a thickness of 1 mm of high-density polyethylene are immersed for 20 s in a 2% solution of 2-nonyl-1-hydroxymethyl-1-carboxymethyl-imidazoline betaine in ethyl alcohol and then dried at room temperature in a vertical position in for 1 day.

The QS of samples treated with this method is 6.0-10 ohms at 20 ± 3 ° C and a relative humidity of 65 + 5%.

Example 7. Disks with a diameter of 50 mm and a thickness of 1 mm of low density polyethylene are immersed for 20 s in a 0.5% solution of 2-NONIL-1 - hydroxymethyl-1-carboxymethyl-imidazoline betaine in ethyl alcohol and then

Exist at room temperature in a vertical position for 1 day.

The QS of samples treated in this way is 9.8-10 ohms at 20 + 3 ° C and relative humidity of 65 ± 5%.

Example 8. Disks with a diameter of 58 mm and a thickness of 2 mm from polystyrene are immersed for 20 s in a 3% solution of 2-nonyl-1-hydroxymethyl-1 carboxymethyl-imidazoline betaine in ethyl alcohol and then dried at room temperature in a vertical position for 1 day.

The QS of samples treated with this method is 9.5-10 ohms at 20 ± 3 ° C and relative humidity of 65 + 5%.

Example 9. Disks with a diameter of 50 mm and a thickness of 1 mm of polypropylene are immersed for 20 s in a 3% solution of 2-heptadecyl-1-hydroxymethyl-1-carboxymethyl-imidazoline betaine in ethyl alcohol and then dried at room temperature in a vertical position for 1 days

The QS of the samples treated in this way is 1.2-10 ohms at 20 + 3 ° C and relative humidity of 65 ± 5%).

Example 10. Low density polyethylene is mixed with 1 wt. % 2-octyl-1-hydroxymethyl-1-carboxymethyl-imidazoline betaine on rollers at 135 + 5 ° С for 7 minutes. 0 The obtained samples possess QS 4, ohm at 20 + 30 ° С and relative humidity of 65 ± 5% and have from 120 kgf / cm; ap 135 KGS / CM2; e 580%.

Example 11. Low density polyethylene is shifted from 1 wt. % 2-nonyl-1-hydroxymethyl-1-carboxymethyl-imidazoline betaine on rollers at 135 ± 5 ° С for 7 min.

The obtained samples have QS 1.8-10 ohms at 20 + 3 ° С and relative humidity of 65 ± 5% and have from 125 kgf / cm; ar 137kgs / cm2; b600%.

Example 12. Low density polyethylene shift with 0.5 weight. % 2-nonyl-1-hydroxymethyl-1-carboxymethyl-imidazoline betaine on 5 rolls at 135 + 5 ° С for 7 minutes.

The obtained samples have a QS of 2.10-101 ° ohm at 20 ± 3 ° C and a relative humidity of 65 + 5% and have ar 125 kgf / cm; ar 138kgs / cm2; b590%.

0 Example 13. High density polyethylene is mixed with 4 wt. % 2-nonyl-1-hydroxymethyl-1-carboxymethyl-imidazoline betaine on rollers at 155 ± 5 ° С for 7 minutes.

The obtained samples possess 3.0-10 ohm 5 at 20 + 3 ° С and relative humidity of 65 ± 5% and have crc 240 kgf / cm; ar 130 kgf / cm; 6,270%.

Example 14. Low density polyethylene shift from 4 weight. % 2-heptadecyl-1-ca0 simethyl-1-carboxymethylimidazolium betaine on rollers at 135 + 5 ° С for 7 min. The obtained samples have QS 3.8-10 ohms at 20 ± 3 ° С and relative humidity of 65 + 5% and have aa 115 kgf / cm; ar 125 kgf / cm; 5 t- 550%.

Example 15. Low density polyethylene is mixed with 0.5 weight. % 2-naphthenyl-1-hydroxymethyl-1-carboxymethyl-imidazoline betaine on rollers at 135 ± 5С for 7 minutes.

The obtained samples possess Qs7, at 20 ± 3 ° С and relative humidity of 65 + 5% and have from 120 kgf / cm; RR 132 kgf / cm; e 550%.

Subject invention

The method of imparting antistatic properties to thermoplastic polymers by applying to the surface or adding imidazoline compounds to the mass, characterized in that, in order to improve the antistatic properties of polymers, betaine derivatives of imidazolines, formula, are used as imidazoline compounds

-N

&.

/

CH, SOO

where R is an alkyl radical of St-C or naphthenyl radical.