CS253423B1 - Antielectrostatic treated polyolfines - Google Patents

Abstract

The solution concerns anti-electrostatically modified solutions polyolefins. The essence of anti-electrostatically modified polyolefins according to the invention consists in that a modifier is used as an additive to the polymer polyetheresteramide type, which is prepared by condensation of polyethylene glycol, dicarboxylic acid and ε-caprolactam as component I in admixture with component II, which is a monoester of glycerin a carboxylic acid of total concentration % to 2.5 wt.

Description

The invention relates to antielectrostatically modified polyolefins.

Electrostatic charges accumulate on the surface of polyolefin products such as hydrophobic polymers, especially when large surface areas of fiber, foil, granulate or the like are involved. This phenomenon is the result of the electrical non-conductivity of these polymers. It causes problems in production and also reduces the utility values of products.

Preventing or suppressing the generation of electrostatic charges has been the subject of many research papers in the past, which have shown several ways of solving this problem.

Anti-electrostatic (antistatic) treatment of polymers, especially fibers, foils and other products made of them, is most often carried out with the aid of modifiers, by not applying them to the surface of the polymer or to the mass. and the like are lost, and the antistatic treatment by physical modification in matter is more permanent.

Of the organic substances used so far for the modification of polyolefins in the mass for the purpose of antistatic treatment, e.g. polyetheresteramides AO 237 454, AO 242 256.

Dispersing agents used in dyeing polyolefins in polyoxyethylene glycols and mixtures thereof, copolymers, esters and ethers with carboxylic acids and alcohols and esters of polyhydric alcohols and carboxylic acids AO 195 089, AO 220 955, AO 220 957 also have an antistatic effect. AO 233 483, AO 247 305 and AO 248 915.

The antistatic effect of these substances is manifested to a desired extent at concentrations above 2.5% by weight. in a polymer. Optimally, the concentrations are about 4 wt.

The essence of the antelectrostatically modified polyolefins according to the invention consists in using a polyetheresteramide type modifier prepared by condensation of polyethylene glycol, a long carboxylic acid and ε-caprolactam, such as according to AO 237 4514 at a concentration of up to 1.5% by weight. (component 1j mixed with monoesters of glycerin and carboxylic acids with Ce to C20 at a concentration of up to 1.5% by weight (component II).

Optimally the concentrations of the mixed antistatic modifier in the polyolefin for component I are 0.8% by weight. and for component II also 0.8 wt. The total optimum concentration of the mixed modifier according to the invention is 1.6% by weight. and is substantially lower than the minimum effective concentration of the polyetheresteramide of AO 242 256.

The antistatic treatment can be carried out in conjunction with the coloring of polyolefins in the mass if the polymer comprises an organic or inorganic pigment or filler. The presence of solid particles in the polymer can improve the process of dispersing and homogenizing the modifier. The polymer system may also contain other additives such as light and heat stabilizers and the like.

The high anti-electrostatic activity of the modifier according to the invention lies in the synergistic effect of components I and II.

The antistatic treatment according to the invention is characterized by its stability in washing, cleaning and care under drastic conditions.

The use of a mixed modifier in the antistatic treatment of the polyolefins of the present invention, as compared to the prior art, reduces the overall material demands of the treatment and increases processing reliability, especially in the production of fibers and films.

The examples below illustrate the subject matter of the invention.

EXAMPLE

Polypropylene PP fibers of fineness 170/13 dtex were prepared on a screw extruder TS-16 at 230 ° C. The fibers consisted of 98 wt. % of polypropylene HPF, 0.5 wt. polyetheresteramide (component 1j and 0.5 wt.% glycerin and oleic acid monoester (component II)).

Polypropylene fibers containing 1.0 wt. polyetheresteramide alone, which is the current state of antistatic treatment of PP fibers. Fibers with a 1% content of glycerol monoester and oleic acid alone were also prepared.

Electrostatic charge was measured on knits on a FD-28 in a non-contact manner. PP fibers containing 1 wt. polyetheresteramide had a charge of 12.0 kVcm ^-1 , fibers containing glycerin and oleic acid monoester had a charge of 26 kVch ¹ . The fibers treated according to the invention with a content of 1.0 wt. of the mixed modifier had a static charge of 1 kVcrn ^-1 .

Example 2

As in Example 1, PP fibers containing 0.8 wt. % polyetheresteramide and 0.8 wt. glycerol monoester and stearic acid. Polypropylene fibers containing 1.6 weight percent were also prepared. polyetheresteramide and another sample of PP fibers containing 1.6 wt. monoester of glycerin and stearic acid alone.

PP fibers containing 1.6 wt. polyetheresteramide alone had a charge of 9.0 kVcm ^-1 , containing 1.4 wt. of glycerin and stearic acid monoester alone had 25 kVcm ^-1 . PP fibers according to the invention having a content of 1.6 wt / wt. the 1: 1 mixed modifier had an electrostatic charge of zero.

Example 3

In the same manner as in Example 1, polypropylene fibers were dyed in a mass with 0.5% yellow 95 pigment containing 0.4% w / w. % polyetheresteramide and 0.8 wt. monoester of glycerin and palmitic acid. Fibers containing 1.2% w / w were prepared similarly. polyetheresteramide alone and also glycerol monoester and palmitic acid monoester alone.

Electrostatic charge of fibers containing glycerin monoester alone 25 kVcm ^-1 . The fibers prepared according to the invention had a charge of 2 kVcm ^-1 .

Example 4

Polyethylene PE film was prepared from Bralen SA 200 granular polyethylene at a temperature of 130 ° C containing 0.8 wt.

Claims (1)

Antielectrostatically modified polyolefins, characterized in that the polyolefin comprises a mixed antistatic modifier consisting of 0.2 to 2.5% by weight. % polyetheresteramide, obtainable by esterification of polyethylene glycol and dicarboxylic acid in the presence of esterification catalysts, to produce a polyether ester product which, in the presence of water and ε-caprolactam, further repolyetheresteramide and 0.8 wt. monoester of glycerin and oleic acid. Similarly, a PE film with 1.6 wt. polyetheresteramide alone, and also glycerin monoester and oleic acid monoester. Polyethylene film containing polyetheresteramide alone had an electrostatic charge of 10 kVcm ^-1 , containing monoester glycerine and oleic acid alone had a charge of 18 kVcrn ^-1 . The PE film prepared according to the invention had an electrostatic charge of 1.5 kVcm ^-1 . Example 5 A polypropylene film blaxially oriented at 280 ° C with a content of 1.8 wt. of a mixture of polyetheresteramide and glycerine monoester with stearic acid in a ratio of 1: 1. The polypropylene film treated according to the invention had an electrostatic charge of 1 kVcm ^-1 . The invention agglomerates to form a polyetheresteramide, wherein the content of the amide component may be between 20 and 60% by weight, which is component I and 2.5 to 0.2% by weight. of a monoester of glycerin and a carboxylic acid having a C 14 to C 20, which is component II, with a total concentration of the antistatic modifier up to 2.5% w / w. in polyolefin.