CS253423B1 - Anti-electrostatically modified polyolefins - Google Patents

Abstract

The solution concerns anti-statically treated polyolefins. The essence of the anti-electrostatic modified polyolefins according to the invention is that a polyetheresteramide-type modifier is used as an additive to the polymer, which is prepared by condensing polyethylene glycol, dicarboxylic acid and ε-caprolacium as component I in a mixture with component II, which is a monoester of glycerin and carboxylic acid with a total concentration of up to 2.5% by weight.

Description

2S3423

The invention relates to anti-electrostatically modified polyolefins.

On the surface of polyolefin products as hydrophobic polymers, electrostatic charges accumulate when the specific surface area of the fiber, foil, granulate, etc. is large. This phenomenon is the result of the electrical non-conductivity of these polymers. It causes manufacturing problems and also reduces the utility value of the products.

Preventing the build-up of electrostatic shock or suppressing its creation has been the subject of many researchers in the past, which has led to several solutions to this problem.

The anti-electrostatic (antistatic) treatments of the polymers, especially of the fibers, films and other articles thereof, are most often carried out with modifiers by their non-tacking on the surface of the polymer or into the mass. For example, polyetheresteramides AO 237 454 are protected from the organic materials used so far to modify the polyolefins in the mass for the purpose of antistatic treatment. AO 242 256.

The antistatic effect is also provided by the dispersants used in the dyeing of polyolefins in a polyoxyethylene glycol-based composition and mixtures thereof, copolymers, carboxylic acid esters of esters and alcohols and esters of polyhydric alcohols and carboxylic acids AO 195 089, AO 220 955, AO 220 957, AO 233 483, AO 247 305 and AO248 915.

The antistatic effect of these substances is at a desired level at concentrations above 2.5% by weight. in polymer. Optimum concentrations are about 4% by weight.

The essence of the anti-electrostatically modified polyolefins according to the invention is that a polyetheresteramide type modifier, a preparable condensation of polyethylene glycol, dicarboxylic acid and ε-caprolactam, such as AO 237 4514 at a concentration of up to 1.5% (component I), is used as additive. mixtures with monoesters of glycerine and carboxylic acids having a C 6 to C 20 concentration of up to 1.5% by weight (component II).

Optimally, the concentration of the mixed anti-static modifier in the polyolefin is 1% by weight of 0.8% by weight. and for component II also 0.8 wt. The overall optimum concentration of the mixed modifier is 1.6% by weight according to the invention. and is a substantially lower effective concentration of polyether teramide according to AO 242 256.

The antistatic treatment can be carried out in conjunction with the coloring of the 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 polymeric system may also contain other light and heat stabilizer additives, and the like.

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

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

The use of the mixed modifier in the anti-static treatment of polyolefins according to the invention, compared to the prior art, reduces the overall material intensity of the treatment and increases the process reliability, especially in the production of fibers and films.

The examples below illustrate the invention. Přikladl

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

Under the same conditions, polypropylene fibers containing 1.0 wt. polyetheresteramide alone, represents the current state of antistatic treatment of PP fibers. Fibers were also prepared with a 1% content of monoesteruglycerin alone and oleic acid.

Electrostatic charge was measured on displays on the FD-28 by contactless spots. PP fibers with 1 wt. polyetheresteramide had a charge of 12.0 kVcm -1, fibers containing a monoester of glycerin and oleic acid had a charge of 26 kVch "1. Fibers treated according to the invention containing 1.0% by weight of a mixed modifier malistatic charge 1 kVrn-1.

As described in Example 1, PP fibers were prepared with a content of 0.8% by weight. % polyetheresteramide and 0.8 wt. monoesteruglycerin and stearic acid. They prepared a polypropylene fiber with a content of 1.6 percent by weight. polyetheresteramide and another PP fiber composition containing 1.6% by weight of monoester of glycerine and stearic acid. PP fibers containing 1.6 wt. the polyetheresteramide itself exhibited a charge of 9.0 kVcm -1, containing 1.4 wt. the glycerin monoester itself and the stearic acid was 25 kVcm -1. PP fibers according to the invention containing 1.6 wt. 1: 1 mixed electrostatic charge.

Claims (1)

Example 3 In the same manner as in Example 1, the prepared polypropylene fibers dyed in the mass with 0.5% yellow 95 pigment, which contained 0.4% by weight. % polyetherester amide and 0.8 wt. monoester of glycerin and palmitic acid. Similarly, prepared fibers containing 1.2% by weight are similar. polyetheresteramide itself and also monoester of glycerin and palmitic acid itself. Electrostatic charge of fibers with a single glycerine monoester of 25 kVcm-1. Fibers prepared according to the invention had a charge of 2 kVcm -1. Example 4 A polyethylene film PE of granular polyethylene Bralen SA 200 was prepared at a temperature of 130 ° C with a content of 0.8% by weight. SUBSTITUTE Anti-electrostatic-treated polyolefins, characterized in that the polyolefin contains an antistatic modifier consisting of 0.2 to 2.5 wt. polyetheresteramide, obtainable by esterification of polyethylene glycol and dicarboxylic acid with the presence of esterification catalysts, resulting in a polyether ester product which, in the presence of water and ε-caprolactam, further polyetheresteramide and 0.8 wt. monoester of glycerin and oleic acid. Similarly, a PE foil with a content of 1.6 wt. the polyetherester amide itself, as well as the glycerine and oleic acid monoester. The polyethylene film containing the polyetheresteramide itself had an electrostatic charge of 10 kVcm -1 and contained a charge of 18 kVcm -1 for the glycerine and acidic monoester itself. The foil prepared according to the invention had an electrostatic charge of 1.5 kVcm -1. Example 5 A polypropylene film was prepared bi-axially oriented at 280 ° C with a content of 1.8% by weight. a 1: 1 mixture of polyetherester amide and glycerol monoester with stearic acid. The polypropylene film according to the invention had an electro-static charge of 1 kVcm-1. It is found to form a polyetheresteramide wherein the amide component content can range from 20 to 60% by weight, which is component I and 2.5 to 0.2% by weight. monoesteruglycerin and carboxylic acid with Cm to C20, Co represents component II, with a total concentration of the antistatic dispersant up to 2.5% by weight. in polyolefin.