KR970011932B1 - Method of manufacturing polypropylene nonwoven of fabrics - Google Patents

Abstract

2-(4-thiazolil) benzimidazol as an organic bacteria repellent and m-ethyl polyoxyethylene phenyleter sodium sulfate are compounded, refined to produce a polypropylene bacteria-retardant mast batch. This master batch is mixed, spun with the polypropylene chip for an unwoven fabric, and having such a mechanism that an usual unwoven fabric is produced, a polypropylene fiber having a long length unwoven fabric is produced.

Description

Manufacturing method of polypropylene nonwoven fabric with excellent antibacterial and antistatic properties

The present invention relates to a method for producing a polypropylene long fiber nonwoven fabric having excellent antimicrobial properties and antistatic properties, and more specifically, to an organic antimicrobial agent, thiazolyl benzimidazole (2- (4-thiazolyl) benzimidazole (Formula I)) Methyl polyoxyethylene phenylether sodium sulphate (Formula (II)) having a molecular weight of 6,000 to 7,000 was added to the polypropylene resin and kneaded to prepare a polypropylene antibacterial master batch. The present invention relates to a method for producing a polypropylene long fiber nonwoven fabric having excellent antimicrobial and antistatic properties, characterized by mixing and spinning with a polypropylene chip for nonwoven fabric and producing a nonwoven fabric by a conventional method.

(However, R 'is a monovalent organic, R "is a compound containing a C1-C8 aliphatic hydrocarbon, n is an integer.)

Recently, the nonwoven fabric which is rapidly growing in the textile industry has been introduced various types of nonwoven fabric since the first commercialized non-woven fabric that bonded the mixed web of nylon and rayon fibers with latex in the United States. Nonwoven fabrics manufactured without spinning processes vary in product characteristics depending on the raw fiber and the bonding method, and are a field of textile products that are rapidly growing due to the low manufacturing cost compared to conventional knitted fabrics and woven fabrics. Non-woven fabrics are currently used as substitutes for textiles and knitwear, as well as for garments and apparel subsidiary materials, as well as for civil engineering, construction, agriculture, automotive interiors, filters, artificial leather, carpets, roofing materials, etc. The use of sanitary materials, disposable products, etc. has been greatly expanded, and in developed countries, for the purpose of high performance and diversification of non-woven fabrics, the manufacturing techniques of nonwoven fabrics with different manufacturing methods and the combination of woven fabrics and nonwoven fabrics are applied. Is expected to expand further.

In particular, long-fiber nonwoven fabrics made of polypropylene (hereinafter referred to as "PP") are the most widespread areas in the nonwoven fabric field, and demand for clothes and industrial materials is increasing every year. In particular, sanitary materials of cover stocks or medical gowns for disposable diapers, and living materials such as suit cases, duvet covers, quilting, filters, packaging materials, etc. The demand is greatly expanded by articles.

On the other hand, there are a myriad of microorganisms in our environment, and they are suitable for their habitat, but they grow underneath, and some bacteria and molds are known to greatly affect the fiber material. . Therefore, studies have been conducted to give polypropylene nonwoven fabrics an antibacterial function for inhibiting bacterial propagation and an antistatic function for suppressing the generation of static electricity.

As a method of imparting antimicrobial and deodorizing properties to existing nonwoven fabrics, the post-treatment method is mainly performed by the spray method during the manufacturing process of nonwoven fabrics. I have a problem with.

In order to solve this problem, a method of preparing an inorganic PP nonwoven fabric having excellent durability by kneading the inorganic particulate ceramic during the production of the PP long fiber nonwoven fabric and uniformly dispersing it in the inside and the surface of the fiber has been studied.

For example, as in Korean Patent Application No. 93-12277, the applicant of the present invention, an inorganic ceramic having a large surface area by fine particles is contained in the long fiber to prepare a PP long fiber nonwoven fabric having antibacterial and deodorizing property. Methods of making are known. In other words, some metal ions destroy the metabolism of microorganisms, and antibacterial properties, and some metal oxides can chemically combine with odorous molecules to produce deodorizing effects and prevent adverse effects due to moisture adsorption when using porous ceramics. A polypropylene long fiber nonwoven fabric having antibacterial and deodorizing properties was prepared by laying an inorganic ceramic having a large surface area due to fine particles and non-porous coza.

In addition, as in Korea Patent Publication No. 93-4540, as an inorganic antimicrobial agent, a method of using an antimicrobial agent ion-exchanged with an antimicrobial metal ion such as copper or silver to a zeolite, which is a porous inorganic material, is widely used. Due to the moisture adsorption properties, disadvantages such as radioactivity and physical property deterioration due to the decrease of the melt viscosity due to moisture in the production of nonwoven fabrics, color defects are pointed out.

In addition, since the antimicrobial agents such as zeolat and zirconium, which are inorganic, have excellent antimicrobial properties and hardly deteriorated physical properties, they have high significance as a technical aspect. However, since the antimicrobial agent itself is very expensive, it is not practical to apply to nonwoven fabrics. It is deteriorated and poor compared to the zeolide-based antimicrobial agent in terms of porosity, when applied to bedding applications such as duvet cover or quenching has a disadvantage in that the performance of removing odor.

On the other hand, researches using relatively low-cost organic antimicrobials instead of inorganic antimicrobials have been conducted using the fourth-class ammonium salt salt system as in Japanese Patent Application Laid-Open No. 62-42715 or deacetylated chitin as in Japanese Patent Application Laid-Open No. 4-272273. However, it is easy to cause decomposition and evaporation to heat, and thus has the drawback of yellowing when using heat resistance, human safety and laundry durability, and especially chlorine detergent.

Accordingly, an object of the present invention is to provide a manufacturing method that can be easily manufactured at a low price in manufacturing a nonwoven fabric having excellent antimicrobial properties and wire-breaking properties.

In order to achieve the above object as well as another object easily expressed, inexpensive antimicrobial agent is applied instead of inorganic antimicrobial system, but it is improved in practicality and applied to an organic antimicrobial agent that satisfies human stability and thermal stability. A propylene long fiber nonwoven fabric was prepared.

The present invention will be described in more detail as follows.

A polypropylene antibacterial master by adding and kneading the following compound of formula (I) [chemical name: 2- (4-thiazolyl) benzimidazole] which is an organic antimicrobial agent and compound of formula (II) (chemical name: methyl polyoxyethylene phenylether sodium sulphate) to the polypropylene resin After preparing a master batch, polypropylene chips for nonwoven fabrics were mixed and spun and a polypropylene long filament nonwoven fabric was manufactured using a conventional nonwoven fabric manufacturing method.

That is, the present inventors have conducted a long-term study on the application of the organic antimicrobial agent as a result of the organic thermal antimicrobial agent of the following formula (I) excellent thermal stability and no deterioration in human stability, especially after washing: 2- (4- thiazolyl) benzimidazole) Was selected.

In order to impart antimicrobial and antistatic properties to polypropylene nonwovens, there is no deterioration of physical properties of nonwoven fabrics, and the following formula (II) compound having an average molecular weight of 6,000 to 7,000 (chemical name: methyl polyoxyethylene phenylether sodium sulphate).

(However, R 'is a monovalent organic, R "is a compound containing a C1-C8 aliphatic hydrocarbon, n is an integer.)

The dosage range of the compound of formula (I), which is an antibacterial agent, is suitably 0.1 to 5% by weight, and most preferably 0.3 to 4% by weight based on the polypropylene resin. If the amount is less than 0.1% by weight, the antimicrobial properties are poor, and if it is more than 5% by weight, color defects and physical properties of the nonwoven fabric are caused and are disadvantageous in terms of economy. In addition, the amount of the compound of formula (II) is preferably 0.3 to 3% by weight based on the polypropylene resin. If it is out of this range, the deterioration of antistatic property or color tone and property deterioration are caused.

The following examples and comparative examples further illustrate the present invention, but do not limit the scope of the present invention.

Example 1

Melt index 15, 80% by weight of polypropylene powder with an average particle diameter of 200 µm, 3% by weight of thiazolyl benzoimidazole 2- (4-thiazolyl) benzimidazole), methyl polyoxyethylene phenyl ether sodium sulfite with an average molecular weight of 65,99 (methyl polyoxthylene phenylether sodium sulphate) 1% by weight, TiO ₂ powder (manufactured by Fuji-Japan) 2.5% by weight as a heat stabilizer 0.1% by weight of Irganox 1010 (manufactured by Shivagaigi Co., Ltd.) After placing the weight in a mixer and mixing, using a kneader equipped with twin screws melt and knead at a speed of 200 ~ 250rpm to prepare a master batch chip. At this time, the temperature range of the melting zone (Zone) is designated as 200 ~ 220 ℃, the manufactured chip is dried in 120 ℃ × 4hr conditions in a vacuum dryer to maintain a moisture content of 40ppm level. The prepared chips were melt spun and mixed with a polypropylene chip for nonwoven fabric having a melt index of 35 at a ratio of 1: 9 to form a polypropylene long fiber nonwoven fabric through web formation and heat bonding. The results are shown in Table 1 below. .

Example 2

Example 1, except using 2% by weight of thiazolyl benzimidazole- (4-thiazolyl) benzimidazole) and 3% by weight of methyl polyoxthylene phenylether sodium sulphate The experiment was conducted under the same conditions and the same method as in Example 1, and the results are shown in Table 1.

Example 3

In Example 1, using 1 wt% of thiazolyl benzimidazole and 3 wt% of methyl polyoxthylene phenylether sodium sulphate Except that, the experiment was conducted under the same conditions and the same method as in Example 1, and the results are shown in Table 1.

Comparative Example 1

Example 1, except that 17% by weight of thiazolyl benzimidazole (2- (4-thiazolyl) venzimidazole) was added and no polyhexamethylene biguanide hydrochloride was added. The experiments were conducted under the same conditions and the same method, and the results are shown in Table 1.

Comparative Example 2

In Example 1, the experiment was conducted under the same conditions and the same method as in Example 1, except that 17 wt% of methyl polyoxthylene phenylether sodium sulphate was added. It is described in.

Comparative Example 3

A polypropylene chip for nonwoven fabric having a melt index of 35 and a TiO ₂ master batch (concentration: 2.5%) were kneaded at 9: 1 to melt-spun, and a polypropylene long fiber nonwoven fabric was prepared through web shape and heat bonding. Physical properties were evaluated and the results are shown in Table 1.

The comparative examples and various evaluation methods used are described below.

● Antimicrobial Evaluation

Shake Flask method (approved by the Japanese Textile Sanitary Processing Association) Measured by the reduction rate of bacteria (Use strain: ATCC 6538P)

● Antistatic

Rotary friction voltage measurement (20 ℃, 50% R, H)

● Wash durability

Theta durability evaluation after 50 times based on JIS L-0291

● Evaluation of strength and elongation of nonwoven fabric

The strength and elongation of the nonwoven fabric were evaluated by the ASTM D 5035 cut strip method.

● Weather resistance evaluation

Based on ASTM G-26 standard, color fading by weather-0-meter was determined as gray-scale. In case of 5th grade, it is level with no color change.

Claims (4)

After mixing and kneading a polypropylene resin and an organic compound represented by the following formulas (I) and (II) to prepare a master batch, kneading and spinning with a polypropylene chip for nonwoven fabric and spinning the nonwoven fabric in a conventional manner Method for producing a polypropylene nonwoven fabric characterized in that the manufacturing. (However, R 'is a monovalent organic, R "is a compound containing a C1-C8 aliphatic hydrocarbon, n is an integer.) The method for producing a polypropylene nonwoven fabric according to claim 1, wherein the amount of the compound of formula (I) is 0.1 to 5% by weight based on the polypropylene resin. The method for producing a polypropylene nonwoven fabric according to claim 1, wherein the average molecular weight of the compound of formula (II) is 6,000 to 7,000. The method for producing a polypropylene nonwoven fabric according to claim 1, wherein the amount of the compound of formula (II) is 0.1 to 5% by weight based on the polypropylene resin.