CS218728B1 - Maleic anhydride-inoculated polypropylene, hydrophilized with nonionic surfactants and prepared - Google Patents

Abstract

The invention belongs to the field of plastics technology. It solves the problem of preparing polypropylene grafted with maleic anhydride hydrophilized with nonionic surfactants of the alkyl polyglycol ether or acyl polyglycol ether type, by depolymerizing isotactic polypropylene at a temperature of 100 to 150 °C in xylene in the presence of a peroxide catalyst, preferably dibenzoyl peroxide. Then, this is grafted with maleic anhydride at a temperature of 100 to 150 °C in the presence of a peroxide catalyst, further esterified with nonionic surfactants of the oxyethylated higher alcohol or oxyethylated higher carboxylic acids type, the degree of oxyethylation of these nonionic surfactants being 5 to 25, preferably 20 ethylene oxide units. Maleic anhydride grafted polypropylene hydrophilized with nonionic surfactants has a molecular weight of 150,000 to 156,000 and the content of ethylene oxide groups is 11.5 to 11.8%.

Description

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BACKGROUND OF THE INVENTION The present invention relates to polypropylene grafted with haloaline anhydride hydrophilized with nonionic surfactants and to a process for its preparation from isotactic polypropylene.

Polypropylene fibers, currently the cheapest synthetic fibers, exhibit some negative-performance properties such as low aqueous sorption, vapor, static charge build-up, poor durability of the spine, pulled dyeing, mostly in bulk. These properties are related to the non-polar character of the polypropylene fiber resulting from the absence of polar functional groups in the macromolecule.

The properties of the polypropylene fiber can be improved by surface treatment by bonding the reactive groups to the surface of the raffia. by chlorination, or by chlorosulfonation, or by treating the surface with suitable polyfunctional compounds capable of diffusing into the fiber. Essentially the organic organic phosphoacids and polyfunctional nitrogen compounds as described by Pajgrt, Reichstadter, Sevcik et al .: Polypropylene fibers 1st edition, Prague, 1977). Also described is the use of a condensation product of polypropylene granulate with a manganese anhydride and polyethylene glycol nonylphenol ether in Japan. pat. 71 03838.

The problem of hydrophilic treatment is the invention, which describes polypropylene grafted maleic anhydride and hydrophilized with nonionic surfactants of the typical polyglycol ethers. acylpolyglycol ethers having a molecular weight of 150,000 to 156,000 and an ethylene oxide content of 11.5 to 11.8%. The essence of the preparation is the dopolymerization of isotactic propylene at 100-150 ° C in xylene presence of peroxidic catalyst, preferably with benzoyl peroxide, inoculated with maleic anhydride at 100-150 ° C for the presence of peroxide catalyst, further esterified with nonionic surfactants of the type of oxyethylated higher alcohols, respectively. oxyethylated higher carboxylic acids, wherein the degree of oxyethylation of these nonionic surfactants is 5 to 25, preferably 20, ethylene oxide units.

The product according to the invention is intended and suitable for pre-hydrophilic, antistatic and treatment enabling tensile durability of polypropylene materials. Hereinafter, the preparation of the subject compounds is exemplified by the exemplifying embodiments thereof, without being exclusive to them. Example 1

25 g of granular isotactic polypropylene, 30 g of maleic anhydride, 0.5 g of dibenzoyl peroxide and 250 ml of xylene are added to a 500 ml three-necked flask equipped with a stirrer and thermometer. Stirring at 140 ° C was continued for 2 hours. After cooling, the product was filtered off with suction, and the xylene solvent was removed. After drying, 30 g of product are obtained in the form of a yellow-brown crystalline substance. 218728 10 g of the previous product are mixed with 24 g of lauiyl alcohol oxyethylated with 20 moles of ethylene oxide and 100 ml of xylene in 250 ml of three-necked flask. The mixture was heated at 100 ° C for 2 hours. The product is filtered off and the mixture is shaken three times with 10 ml of distilled water to remove unreacted surfactant. After drying, 30 g of product are obtained in the form of a white solid without a sharp melting point. The visco-metric relative molecular weight is 153,000 and the ethylene oxide content of the modified siggi method is 11.5%. EXAMPLE 2 Treatment of isotactic polypropylene and its seeding is carried out as described in Example I. Next, 10 g of the product obtained are mixed in a 250 ml three-necked flask with 25.8 g of castor oil and 20 ml of ethylene oxide and 100 ml of oxyethylene. The mixture was heated to 105 ° C for 2.5 hours. From the obtained mixture, the product is filtered off with shaking 3 times with 100 ml of distilled water to remove unreacted surfactant. After drying, 32 g of product are obtained in the form of a light beige solid without a sharp melting point. The relative molecular weight viscosimetry is 153,000 and the ethylene oxide content is II, 8%. Example 3 The efficacy of the products prepared according to Examples 1 and 2 is shown in Table 1.

Product A and product B were applied to a standard polypropylene fabric (ČSN 800120) at a rate of 3% on the fabric density and fixed at 105 ° C for 5 minutes, respectively. at 130 ° C for 1/2 minute. In Table 1, the equilibrated properties of product A and product B and untreated 100% polypropylene fabric.

Area charge potential was determined on an EP-02 electric apparatus at 35% relative humidity and 23 ° C. Suction lift was determined by 800828.

Soil release efficacy, i.e., the efficacy for ease of washing the oil dirt, was expressed as a percentage of the washed dirt by determining the optical remission of the polypropylene fabric samples dirty with the engine oil used.

Table 1

Antistatic and hydrophilic efficacy and treatment allowing bottle to run

Area charge potential Adjustment Fixation (kV) after 1st wash after 5th wash untreated - 6,7 6,7 product A 105 ° C 0,0 0,0 130 ° C 1,3 0,6 product B 105 ° C 1, 4 1.5 130 ° C 0.8 1.1

Claims (2)

4 218728 Intake height (in nm) for the Tahkat treatment Adjustment Fixation after 1st wash washout after 5th after 1st after 5th wash wash untreated - 0 0 0,8 0,8 product A 105 ° C 9,6 4 - - 130 ° C 10.2 4.6 11.4 9.7 Product B 105 ° C 8 3 - - 130 ° C 9.2 3.2 12.4 12.2 SUBJECT OF THE INVENTION 1. Polypropylene grafted with maleic anhydride hydrophilized with nonionic surfactants such as alkyl polyglycol ethers or acyl polyglycol ethers having a molecular weight of 150,000 to 156,000 and an ethylene oxide content of 11.5 to 11.8%. 2. A process for the preparation of polypropylene according to claim 1, wherein the isotactic polypropylene is rendered polymerized at 100 DEG-150 DEG C. in xylene by the presence of a peroxidic catalyst, with the exception of dibenzoyl peroxide, to oligomeric polypropylene which, in the presence of a peroxide catalyst, as used in the depolymerization reaction and seeded with maleic anhydride at 100-150 ° C; it is further esterified with non-ionic surfactants of the oxyethylated higher alcohol or oxyethylated higher carboxylic acid type, wherein the degree of oxyethylation of these nonionic surfactants is 5-25, preferably 20 ethylene oxide units. Printed by Moravské tiskařské závody, provoz 12, Leninova 21, Olomouc Price: 2,40 Kčs