SK7462Y1 - Concentrate for the preparation of polypropylene fibers modified by soft cellulose and use of it - Google Patents

Abstract

It is described a concentrate, which contains a polypropylene matrix from 40 to 60 wt.%, colour pigments from 1 to 20% wt., polyethylene wax from 5 to 15 wt.%, amorphous silica from 0.5 to 1.5% by wt. and a soft cellulose which particle size is of from 6 to 12 m in an amount from 1 to 20% by wt. This concentrate is used for preparation of polypropylene fibers, and the applications in the textile products.

Description

The technical solution belongs to the field of polymer chemistry, especially to the production of mass-modified synthetic fibers and plastics with a special focus on achieving surface modification. The aim is to provide a surface modification of the polypropylene fibers to obtain surface properties characteristic of natural fibers such as cotton or wool.

BACKGROUND OF THE INVENTION

Synthetic polymers are currently produced worldwide in millions of tons and have a wide range of applications. Polypropylene for textile applications is treated by the addition of suitable additives, the most commonly used being dye pigments, flame retardants, ultraviolet absorbers, antibacterial additives and others.

The essence of the technical solution

The essence of the technical solution is to use a special additive, which is fine cellulose, whose average particle size is from 6 to 12 microns.

The basis is the preparation of 10 - 20% cellulose concentrate on polypropylene carrier using polyethylene waxes, amorphous silica as a compatibilizer. Such a concentrate can be used to modify polypropylene fibers with a dosage such that the concentration of fine cellulose in the polypropylene fiber is between 0.8-2.0% by weight. Polypropylene fibers are dyed in the mass with a pigment content in the range of 0.05 to 3.0 wt. for fibers having a unit weight of from 0.9 to 10 dtex. Preferably, for fibers having a length weight of from 0.9 to 5.0 dtex for application in textile products, wherein the cellulose concentration in the polypropylene fiber is from 0.8 to 2.0 wt. delivers an effect similar to natural fibers. The wax effect on contact, which is characteristic of polypropylene fibers, is lost.

The modified polypropylene fibers produced with the addition of a describing concentrate are suitable for textile products either 100% of the modified polypropylene fiber or mixed with other fibers, the preferred ratio being 10 to 90% by weight. for modified polypropylene fiber.

Other advantages of textile products that use fine cellulose modified polypropylene fiber include reduced odor spread, increased antibacterial activity of silver-modified polypropylene fibers, the ability to color them, improved thermal insulation properties of textile products for direct contact with human skin, a pleasant touch, reducing the negative impact on the environment and carbon dioxide emissions.

EXAMPLES

Example # 1

5.0 kg of polyethylene wax, amorphous silica as a compatibilizer, are mixed into a 40 kg powdered polypropylene blender. The mixture was stirred at constant speed for 3 minutes. Subsequently, 5.0 kg of cellulose was added and the whole mixture was stirred at constant speed for 6 minutes. The mixture thus prepared is kneaded and melted on a twin spindle kneading machine and subsequently granulated. The prepared concentrate has a flow index of 12 g / 10 min (at 230 ° C and 2.16 kg load) and a filterability of 15 MPa / kg. These properties make it possible to add polypropylene fibers with a unit weight of 0.9 to 10 dtex. Preferably at a dosage of 8 wt. Modified polypropylene fibers with a unit length of 0.9-5.0 dtex having the nature of natural fibers are produced, especially when used as a contact layer in contact with the skin.

Example # 2

In a rapid mixer, 10 kg of a polyethylene wax mixture and amorphous silica as a compatibilizer are mixed into 29 kg of polypropylene powder. The mixture was stirred for 3 minutes. Subsequently, 1.0 kg of antibacterial additive and 10 kg of cellulose are added and the whole mixture is stirred for 8 minutes at constant speed. The mixture thus prepared is kneaded and melted on a double spindle in a m kneader and subsequently granulated. The prepared concentrate has a flow index of 15.0 g / 10 min (at 230 ° C and 2.16 kg load) and a filterability of 20 MPa / kg. These properties make it possible to add polypropylene fibers with a unit weight of 0.9 to 10 dtex. At a dosage of 7 wt. Modified polypropylene fibers having the character of natural fibers are produced separately when used as a contact layer in contact with the skin. Added value2

SK 7462 tou1 in the example no. 1 as well as in Example no. 2 is of a natural nature in the mass of dyed polypropylene fiber, which is particularly important in improving the quality of clothing, especially the bottom, in a wide range of consumer activities.

Example # 3

Of the polypropylene fibers produced according to Examples no. 1 and 2, it is possible to produce textile products with a knitting technology preferably with a 100% proportion of the modified polypropylene fiber, as well as in a mixture with other natural or synthetic fibers. The preferred ratio is 10 to 90 wt. for polypropylene fiber. In the final product, the polypropylene fiber may be on the face or back side.

Industrial usability

The concentrates of the present invention are suitable for modifying fine polypropylene fibers with a unit length of 0.9 to 10.0 dtex. The modified mass-dyed polypropylene fibers can be used in textile products. The modified polypropylene fibers can be used to produce underwear, socks and other textile products using knitting or weaving technology. The product can be in 100% version. The products are particularly specific in that they have similar characteristics to natural materials, but are extremely environmentally friendly in their production process. The indisputable benefit is the ease of products compared to products based on natural fibers or other synthetic fibers, or mixtures thereof.

PROTECTION REQUIREMENTS

Claims (3)

A concentrate for preparing a modified polypropylene fiber by fine cellulose, characterized in that it comprises a polypropylene carrier from 40 to 60% by weight, color pigments from 1 to 20% by weight, polyethylene wax from 5 to 15% by weight, amorphous silica from 0.5 to 1.5 wt. as a compatibilizer and cellulose from 1 to 20% by weight, the average particle size of which is from 6 to 12 microns. Use of the concentrates according to claim 1 for the preparation of modified cellulose-modified polypropylene fibers dyed in a mass with a unit length of from 0.9 to 10 dtex, preferably from 0.9 to 5.0 dtex, for application in textile products, wherein the concentration of cellulose in the % polypropylene fiber is from 0.8 to 2.0 wt. Use of concentrates according to claim 1 for the production of finished products containing 100% modified fiber, or products mixed with other fibers, preferably 10 to 90% modified fiber. End of document