CN1030620C - Polypropylene fine denier and superfine denier blend resin, manufacture and application - Google Patents

Abstract

The invention relates to a resin mixture and a blending method for manufacturing polypropylene modified fine denier yarns and ultrafine denier yarns. It is a direct blend of polypropylene and copolyester with controllable rheology. The present invention can produce fine denier and superfine denier yarn with a monofilament fineness of 0.3-1.3 decitex, and the spun fiber can be dyed with commercially available disperse dyes at normal pressure, and the moisture absorption rate of the fabric is higher than that of polyester, which is suitable for sportswear and underwear. And fabric processing requirements such as spring and autumn fabrics.

Description

The invention relates to a resin mixture and a blending method for manufacturing polypropylene modified fine denier yarns and ultrafine denier yarns.

Fibers made of ordinary polypropylene have not been widely used as clothing fiber materials for a long time due to their poor dyeability, hygroscopicity and waxy feel of fabrics. In recent years, due to the development of fine denier and ultra-fine denier (single filament fineness less than 1 dtex) polypropylene fibers produced by special processing methods, polypropylene fabrics are endowed with significant moisture perspiration and perspiration properties and are widely used in personal clothing, such as high-end sports. Fabrics for shirts, underwear and spring and autumn clothing. However, at present, polypropylene fibers are prepared by adding color masterbatch to make colored yarns to make up for the defect that polypropylene fibers are difficult to dye, and commercially available polypropylene resins can only be spun into fibers with a monofilament fineness greater than 1.3 dtex by general spinning technology.

According to JP02,191,719 report, the composite fiber of general fiber grade polypropylene and the copolymer (CDPET) of sodium sulfonate isophthalic acid-terephthalic acid, dissolves CDPET component after alkali treatment, can make single Ultrafine fibers with a silk fineness of 0.22d are used as filter fabrics. This invention does not involve the application of blended clothing fibers.

The invention blends and modifies the controllable rheology polypropylene resin, which controls the rheology of the polymer by adjusting the molecular weight, with CDPET, etc., so that the prepared fiber has the dyeability of disperse dyes. Since the monofilament fineness of the polypropylene modified fiber prepared by the present invention is 0.3-1.3 decitex, the fabric has a good wicking effect, presents remarkable moisture perspiration and perspiration performance, and further expands the application field of polypropylene fiber. It can be used as a high-grade clothing fiber material, even better than some natural fibers.

The technical gist of the present invention is: a polypropylene modified resin, which is composed of polypropylene and one or more than one other resins, the polypropylene is a resin with controllable rheology, and its melt index is more than or equal to 20 grams /10 minutes, the intrinsic viscosity [η] is 1.25 to 1.55, and the other resins are copolyesters of sodium sulfonate isophthalate and terephthalic acid, ethylene-acetic acid with an intrinsic viscosity [η] of 0.5 to 0.61 Ethylene copolymer and ethylene-acrylic acid copolymerized zinc salt, the weight percent of its formula is:

Polypropylene 80～95

Copolyester 5～20

Ethylene-vinyl acetate copolymer 0～7

Ethylene-acrylic acid copolymer zinc salt 0～4

The optimum formula of polypropylene modified resin is composed of 90% by weight of controlled rheology polypropylene and 10% of sodium sulfonate isophthalate and copolyester of terephthalic acid.

The optimal formulation of polypropylene modified resin is composed of 85% by weight of controlled rheological polypropylene, 10% of sodium sulfonate isophthalate and terephthalic acid copolyester and 5% of ethylene-vinyl acetate copolymer composed of things.

The optimal formulation of polypropylene modified resin is composed of 80% by weight of controlled rheology polypropylene, 19% of sodium sulfonate isophthalate and terephthalic acid copolyester and 1% of ethylene-acrylic acid copolymer composed of zinc salts.

The production method of the polypropylene modified resin of the present invention is that the above resins are directly blended according to the weight ratio, then transported to a twin-screw extruder, melted at a temperature of 270° C., cast and pelletized.

Melt-spin the above-mentioned polypropylene modified resin slices, stretch 3-5 times between room temperature and 120°C at a spinning speed of 400-1100 m/min, and it can be made into dyeable and single-filament fineness of 0.3-1.3 Dtex fine denier and super fine denier.

Compared with the prior art, the present invention has the following advantages:

1. The fibers spun from the co-temperature modified polypropylene resin of the present invention can be dyed with commercially available disperse dyes at normal pressure, and have good color tone. As measured by the colorimeter, the KS value of pure polypropylene is increased from 0.63 to 3.61 when dyed with disperse red 3B, and the KS value is increased from 0.62 to 6.40 when dyed with disperse blue 2BLN.

2. When the fiber spun when the modified resin contains 10% by weight of CDPET, after alkali treatment, the hygroscopicity of polypropylene can be increased from 0.02% to 0.521%, which is higher than that of polyester 0.4%. To a certain extent, it overcomes the waxy feeling of polypropylene fiber fabrics.

3. The monofilament fineness of the fiber produced by the ordinary high-power drawing method of the present invention is 0.3-1.3 dtex, the strength is ≥ 4 N/dtex, and the elongation is ≤ 60%. It meets the processing requirements of fabrics such as sportswear, underwear and spring and autumn fabrics.

The present invention will be further elaborated below by three examples:

Example one:

The CDPET slices were dried at 100°C for 48 hours under a vacuum of 760mmHg column, and the above-mentioned controllable rheology polypropylene and CDPET were mixed at a weight ratio of 90:10, and then extruded on a Branbender ZSK 30M9/II twin-screw at 270°C. Melt blending and belt granulation in the machine. The blended extrudate is observed under the scanning electron microscope, which has a uniformly distributed microfiber-matrix structure (see photo), the maximum particle size of the CDPET dispersed phase is less than 3 microns, melt-spun at 400 m/min, and the obtained strength is ≥ Fibers with 4 N/dtex, elongation ≤ 80%, and denier of 0.7 dtex.

Example two:

The above-mentioned controllable rheological polypropylene and vacuum-dried CDPET ethylene-vinyl acetate copolymer were mixed at a weight ratio of 85:10:5, and melt-blended in a Branbender ZSK 30M9/II twin-screw extruder at 270°C to form a belt Granulate. Observation under the scanning electron microscope, the blended extrudate obtained has a uniform distribution (photo 2), the maximum particle diameter of the dispersed phase is <2.3 microns, and the fineness of the obtained fiber is 1 dtex.

Example three:

The above-mentioned controllable rheology polypropylene and vacuum-dried CDPET ethylene-acrylic acid copolymer zinc salt were blended and granulated at a weight ratio of 80:19:1, and the obtained blended extrudate was observed under a scanning electron microscope, and the blended The particle distribution is improved (photo 3), the maximum particle size of the dispersed phase is less than 2 microns, and the fineness of the obtained fiber is 1.3 decitex.

Claims (5)

1. A blended resin for polypropylene fine denier and superfine denier, composed of polypropylene and one or more other resins, characterized in that the polypropylene is a resin with controllable rheology, and its melt index >20 g/10 minutes, the intrinsic viscosity [η] is 1.25 to 1.55, and the other resins mentioned above have an intrinsic viscosity [η] of 0.5 to 0.61, the copolyester of sodium isophthalic acid sulfonate and terephthalic acid, ethylene -Vinyl acetate copolymer and ethylene-acrylic acid copolymer zinc salt, the weight percent of its formula is: Polypropylene 80～95 Copolyester 5～20 Ethylene-vinyl acetate copolymer 0～7 Ethylene-acrylic acid copolymer zinc salt 0～4 2. According to claim 1, the blended resin for polypropylene fiber fine denier and super fine denier is characterized in that the optimal formulation is 90% by weight ratio of controllable rheological polypropylene and 10% isophthalic acid It is composed of sodium methanesulfonate and terephthalic acid copolyester. 3. According to claim 1, the blended resin for polypropylene fine denier and super fine denier is characterized in that the optimal formulation is 85% by weight ratio of controllable rheological polypropylene, 10% isophthalic Sodium sulfonate and terephthalic acid copolyester and 5% ethylene-vinyl acetate copolymer. 4. The blended resin for polypropylene fiber fine denier and super fine denier according to claim 1, characterized in that the optimal formula is 80% by weight ratio of controllable rheological polypropylene, 19% isophthalic acid Sodium sulfonate and terephthalic acid copolyester and 1% ethylene-acrylic acid copolymer zinc salt. 5. Fine and ultra-fine denier yarns with dyeability and single-filament fineness of 0.3-1.3 decitex prepared by blending resin vinegar for polypropylene fiber fine denier and ultra-fine denier according to any one of claims 1-4.