KR20240053685A - Thermal Bonding Composite Fiber With Excellent Compression Recovery - Google Patents

Abstract

The present invention relates to a heat-bonded composite fiber with excellent compression recovery, wherein the first component core portion of the composite fiber is either polypropylene (PP) or polyester (PET) resin, and the second component sheath portion is polyethylene (PE). 50 to 99 wt% of copolymerized polyester resin is mixed with 1 to 50 wt% of copolymerized polyester resin, which is an acidic component consisting of terephthalic acid or its ester-forming derivative, and 2-methyl-1,3-propanediol. , 2-methyl-1,3-pentanediol, and a diol component consisting of ethylene glycol, a polyester (PET) resin of the first component and a copolymerization process of a copolyester resin added to the second component, Or, during the condensation polymerization of the copolyester resin added to the second component, calcium diethyl bis (3,5-bis (1,1-dimethylethyl) -4-hydroxy phenyl methyl phosphonate) (Calciumdiethyl bis ( (3,5-bis(1,1-dimethylethyl)-4-hydroxy phenyl methyl phosphonate)) is added in an amount of 5 to 1,000 ppm based on the weight of each polyester resin, and the phenylamine component is added during composite spinning when the resin is applied. It relates to a heat-bonded composite fiber with excellent compression recovery, characterized in that 200 to 2,000 ppm of the total weight is added to each of the polyester (PET) resin among the first component and the copolymerized polyester resin added to the second component.

Description

Thermal Bonding Composite Fiber With Excellent Compression Recovery}

The present invention is a heat-bonded PE/PP or PE/PET composite fiber with excellent compression recovery. More specifically, it is a composite fiber characterized by a selective mixture of copolymerized polyester resin and VOCs reduction additives in the sheath and core portions.

Low-density non-woven fabric with a fabric density of 10 to 45 g/m2 is used as a surface material for paper diapers, sanitary napkins, etc. As the uses of non-woven fabrics have diversified, recently, the performance of non-woven fabrics used in sanitary materials such as sanitary napkins and diapers has diversified, and functions such as high elasticity, high bulkiness, and water absorption/water repellency are being emphasized, and these various functions are provided. The development of composite fibers that can In particular, bulky nonwoven fabrics with many pores are used to improve liquid penetration and absorption functions.

Non-woven fabrics have a disadvantage in that they are compressed during transport due to their low weight, and bulkiness is reduced due to such compression packaging. In order to meet these demands, composite fibers that can provide more bulkiness to non-woven fabrics are needed.

In addition, it is often manufactured using non-woven fabric, and when using multiple layers of non-woven fabric, a low melting point non-woven fabric for a binder is required.

For this purpose, composite fibers that are fine, heat-adhesive, and have low melting point components that not only provide sufficient heat-adhesive strength but also provide flexibility are needed.

Conventionally, cis-core type or side-by-side type composite fibers containing polyolefin components such as polyethylene and polypropylene as low melting point components and polyolefin components such as common polyester such as polyethylene terephthalate and polypropylene as high melting point components. is widely known, and the amount of VOCs generated from composite fiber components is increasing.

Despite the generation of large amounts of VOCs, petrochemical products can maintain their properties even under various climatic conditions and changes, and since large quantities of products can be supplied at low cost, they can replace materials from petrochemical products that generate large amounts of VOCs. The reality is that it is not easy to do.

Accordingly, the present invention led to the development of heat-bonded composite fibers for non-woven binders with excellent elasticity, such as the rigidity and elastic recovery of non-woven fabrics.

The purpose of the present invention is to mix copolymerized polyester resins to improve the compression recovery of non-woven materials to which composite fibers of PE/PP or PE/PET are applied.

In order to solve the above problems, the present invention provides a heat-bonded composite fiber with excellent compression recovery, wherein the first component core portion of the composite fiber is made of either polypropylene (PP) or polyester (PET) resin, and The two-component sheath portion is a mixture of 50 to 99% by weight of polyethylene (PE) and 1 to 50% by weight of copolymerized polyester resin. The copolyester resin is an acidic component consisting of terephthalic acid or an ester-forming derivative thereof, and 2- A copolymer formed of a diol component consisting of methyl-1,3-propanediol, 2-methyl-1,3-pentanediol, and ethylene glycol, and added to the polyester (PET) resin and the second component of the first component. Calcium diethyl bis (3,5-bis(1,1-dimethylethyl)-4-hydroxy phenyl during the condensation polymerization process of a polyester resin or a co-polyester resin added to the second component. Calciumdiethyl bis ((3,5-bis(1,1-dimethylethyl)-4-hydroxy phenyl methyl phosphonate)) is added in an amount of 5 to 1,000 ppm based on the weight of each polyester resin. Compression recovery is characterized by the addition of 200 to 2,000 ppm of the phenylamine-based component relative to the total weight of the polyester (PET) resin in the first component and the copolymerized polyester resin added to the second component during composite spinning. Provides excellent heat-bonded composite fibers.

In addition, the present invention provides a heat-bonded composite fiber with excellent compression recovery, characterized in that the first component and the second component have a weight ratio of 80:20 to 20:80.

In addition, the present invention provides a heat-bonded composite fiber with excellent compression recovery, characterized in that the cross-section of the composite fiber is circular or hollow.

As described above, the present invention enhances the compression recovery of non-woven fabric materials to which composite fibers of PE/PP or PE/PET are applied, thereby increasing the service life when applied to non-woven fabrics that generate a lot of friction such as diapers, napkins, and packaging materials. there is.

Figure 1 is a cross-sectional view showing a composite fiber according to an embodiment of the present invention.
Figure 2 is a cross-sectional view showing a conventional composite fiber.

Hereinafter, preferred embodiments of the present invention will be described in detail. First, in describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order to not obscure the gist of the present invention.

As used herein, the terms 'about', 'substantially', etc. are used to mean at or close to the numerical value when manufacturing and material tolerances inherent in the stated meaning are presented, and are used to enhance the understanding of the present invention. Precise or absolute figures are used to assist in preventing unscrupulous infringers from taking unfair advantage of stated disclosures.

The present invention relates to heat-bonded composite fibers with excellent abrasion resistance.

The first component core portion of the composite fiber is either polypropylene (PP) or polyester (PET) resin, and the second component sheath portion is a mixture of polyethylene (PE) and copolyester resin, and is made of a second component in a mixing ratio. Ingredients: The sheath part is made of 50 to 99% by weight of polyethylene (PE) mixed with 1 to 50% by weight of copolymerized polyester resin.

The first component used is polypropylene (PP) and a commonly used commercial composition.

The first component polyester (PET) resin is a condensation polymer of aromatic dicarboxylic acid and glycol. As aromatic dicarboxylic acid, terephthalic acid, isophthalic acid, phthalic acid, naphthalenedicarboxylic acid, etc. can be used, and ethylene glycol as glycol. , 1,3-propanediol, 1,4-butanediol, etc. can be used.

Alternatively, the first component polyester (PET) resin is a condensation polymer of aromatic dicarboxylic acid and glycol and is selected from polyethylene terephthalate, polyethylene 2,6-dinaphthalate, polypropylene terephthalate, polybutylene terephthalate, and polyethylene isophthalate. One or a mixture of two or more may be used.

Preferably, polyethylene terephthalate can be used, and it is preferable to use a polyester resin having an intrinsic viscosity (IV) of 0.50 to 0.80 dL/g as measured according to ASTM 02857.

The polyethylene (PE) of the second component sheath may be one or a mixture of two or more selected from high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), polypropylene, and ethylene-propylene copolymer. .

Preferably, high-density polyethylene (HDPE) can be used, and the flow index (MI, melting lndex) is not particularly limited, but the flow index is 1 to 100 g/lO min, more preferably 5 to 40 g/10 min. It would be desirable.

The copolymerized polyester resin includes an acid component consisting of terephthalic acid or an ester-forming derivative thereof, and 2-Methyl 1,3-propanediol (2-Methyl 1,3 Prorpanediol) and 2-methyl-1,3-pentanediol ( It is formed from a diol component consisting of 2-Methyl 1,3 Pentanediol) and ethylene glycol (EG).

The 2-methyl-1,3-propanediol of the copolyester resin used in the present invention has a methyl group bonded to the second carbon to facilitate rotation of the polymer main chain and acts as an end portion of the polymer to create a free space between main chains. By widening, the possibility of movement of the entire molecular chain increases. This causes the polymer to become amorphous and have the same thermal properties as isophthalic acid. The flexible molecular chain present in the polymer main chain improves elasticity and improves tear characteristics when binding non-woven fabric.

In other words, 2-methyl-1,3-propanediol is methyl attached to the ethylene chain bound to terephthalate.

By securing space for the main chain of the polymerized resin to rotate by including the group (-CH3) as a side chain, the degree of freedom of the main chain is increased and the crystallinity of the resin is reduced, thereby increasing the softening point (Ts) and/or glass transition temperature (Tg). ) can be adjusted. This can have the same effect as when isophthalic acid (IPA) containing an asymmetric aromatic ring is used to reduce the crystallinity of a conventional crystalline polyester resin.

The 2-methyl-1,3-pentanediol, like the 2-methyl-1,3-propanediol, has a methyl group bonded to the second carbon to facilitate rotation of the polymer main chain and imparts low melting point characteristics to the polyester resin. It has a longer molecular chain than 2-methyl-1,3-propanediol, increasing the melt viscosity of polyester resin and preventing a rapid decrease in melt viscosity at high temperatures.

The copolymerized polyester resin of the present invention formed from the above diol component contains 20 to 50 mol% of 2-methyl-1,3-propanediol in the diol component in order to improve low melting point characteristics and adhesion. It would be desirable to contain it.

If the 2-methyl-1,3-pentanediol is contained in less than 0.01 mol% of the diol component, the effect of improving melt viscosity is minimal, and if it exceeds 5 mol%, the melt viscosity increases rapidly and spinning processability may be reduced. It is preferable to contain 0.01 to 5 mol% of 2-methyl-1,3-pentanediol in the diol component.

It would be most preferable to contain 0.05 to 2 mol% of 2-methyl-1,3-pentanediol.

The copolyester resin containing 2-methyl-1,3-pentanediol is heated at 220°C.

The difference between the melt viscosity and the melt viscosity at 260°C is less than 600 poise, which means that the melt viscosity does not decrease rapidly at high temperatures.

The lower the difference between the melt viscosity at 220°C and the melt viscosity at 260°C of the copolymerized polyester resin, the lower it is, the more preferably it is 500 poise or less.

As described above, the copolymerized polyester resin of the present invention containing 2-methyl-1,3-propanediol and 2-methyl-1,3-pentanediol has a softening temperature of 100°C to 150°C and a glass transition temperature of 50°C. It has excellent physical properties at temperatures ranging from ℃ to 90℃ and an intrinsic viscosity of 0.50 ㎗/g or more.

In addition, it would be preferable for the composite fiber to have the first component and the second component in a weight ratio of 80:20 to 20:80.

In addition, during the condensation polymerization process of the polyester (PET) resin of the first component and the co-polyester resin added to the second component, or the condensation polymerization process of the co-polyester resin added to the second component, calcium diethyl bis ( Calciumdiethyl bis ((3,5-bis(1,1-dimethylethyl)-4-hydroxy phenyl methyl phosphonate)) 5 to 1,000 ppm is added based on the weight of each polyester resin, and when the resin is applied and composite spinning, a phenylamine-based component is added to the polyester (PET) resin of the first component and the second component. 200 to 2,000 ppm is added to each of the total weight, which has the effect of reducing VOCs.

In addition, the composite fiber is preferably formed in a weight ratio of 80:20 to 20:80 between the first component and the second component.

Hereinafter, examples of a method for manufacturing heat-bonded composite fibers with enhanced abrasion resistance according to the present invention will be shown, but the present invention is not limited to the examples.

Example 1

Polypropylene (PP) as the first component of the core portion and polyethylene (PE) and copolymerized polyester resin as the second component composition of the sheath portion are 99% by weight and 1% by weight, respectively, and are added to the extruder at a weight ratio of 50:50 to the core portion and the sheath portion. It was put in and melted.

The molten first and second component compositions were introduced into a conventional sheath-core soft composite spinning device and spun at a spinning speed of 800 m/min.

The second ingredient is calcium diethyl bis (3,5-bis(1,1-dimethylethyl)-4-hydroxy phenyl methyl phosphonate) ((3,5-bis(1,1-dimethylethyl) 5ppm of -4-hydroxy phenyl methyl phosphonate) and 200ppm of anthranilamide additive were added.

At this time, the cross-sectional shape of the spun yarn is eccentric (Figure 1a). The composite fiber spun at a temperature above the glass transition temperature of polyethylene terephthalate was stretched 3.0 to 4.0 times, crimped, and cut to 38 to 64 mm to prepare a heat-bonded composite fiber according to the present invention.

The manufactured composite fiber was made of 30GSM nonwoven fabric.

Example 2

The second component composition was the same as Example 1 except that the ratio of polyethylene and copolyester resin was 80% by weight: 20% by weight.

Example 3

The second component composition was the same as Example 1 except that the ratio of polyethylene and copolyester resin was 50% by weight: 50% by weight.

Example 4

The first ingredient composition is polyethylene terephthalate (PET), and the first ingredient is calcium diethyl bis (3,5-bis(1,1-dimethylethyl)-4-hydroxy phenyl methyl phosphonate). It is the same as Example 2 except that 5ppm of ((3,5-bis(1,1-dimethylethyl)-4-hydroxy phenyl methyl phosphonate)) and 200ppm of anthranilamide additive were added.

Example 5

The cross-sectional shape is the same as Example 4 except that it is hollow (Figure 1b).

Example 6

Calciumdiethyl bis (3,5-bis(1,1-dimethylethyl)-4-hydroxy phenyl methyl phosphonate) added to the first and second components ((3,5-bis( It is the same as Example 4 except that the 1,1-dimethylethyl)-4-hydroxy phenyl methyl phosphonate) content is 1000 ppm, the anthranilamide additive content is 1000 ppm, and the cross-sectional shape is hollow and eccentric ( Figure 1c).

Comparative Example 1

The cross-sectional shape is circular, the second component composition contains polyethylene and copolyester resin in a ratio of 100% by weight: 0% by weight, and calcium diethyl bis (3,5-bis(1,1-dimethylethyl)-4- Except that Calciumdiethyl bis ((3,5-bis(1,1-dimethylethyl)-4-hydroxy phenyl methyl phosphonate)) and Anthranilamide additives are not added. Same as Example 1 (Figure 2).

division profit Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 1 ingredient profit PP PP PP PET PET PET PET additive 1,2 complex antioxidant - - - 5ppm 5ppm 1000 ppm - additive Phenylamine type - - - 20 ppm 20 ppm 2000ppm - 2 ingredients profit PE/co-PET PE/co-PET PE/co-PET PE/co-PET PE/co-PET PE/co-PET PE/co-PET Resin (PE/co-PET) weight% 99/1 80/20 50/50 80/20 80/20 80/20 100/0 additive 1,2 complex antioxidant 5 ppm 5ppm 5 ppm 5 ppm 5ppm 1000 ppm - additive Phenylamine type 20ppm 20 ppm 20ppm 20 ppm 20 ppm 2000ppm - section eccentric eccentric eccentric eccentric hollow hollow eccentricity circle (Figure 1a) (Figure 1a) (Figure 1a) (Figure 1a) (Figure 1b) (Figure 1c) (Figure 2) Nonwoven compression recovery rate, %, (1Kg/cm2 pressure, 24hr compression) 65 63 62 68 69 52 47 Acetaldehyde generation amount among VOC substances (Hyundai Motor Company MS300-55 regulations) 300㎍/m3 300㎍/m3 300㎍/m3 300㎍/m3 300㎍/m3 400㎍/m3 1300 ㎍/m3

*1,2 Complex antioxidant:

Calciumdiethyl bis ((3,5-bis(1,1-dimethylethyl)-4-hydroxy phenyl methyl phosphonate))

As shown in Table 1, Examples 1 to 6 had excellent nonwoven fabric compression recovery rates of 62 to 69% and low VOCs emissions. On the other hand, in Comparative Example 1, the nonwoven fabric compression recovery rate was insufficient at 47% and the VOCs emission amount was also high.

Claims (3)

In heat-bonded composite fibers with excellent compression recovery,
The first component core part of the composite fiber is either polypropylene (PP) or polyester (PET) resin,
The second component sheath is a mixture of 50 to 99% by weight of polyethylene (PE) and 1 to 50% by weight of copolymerized polyester resin.
The copolyester resin is formed of an acid component consisting of terephthalic acid or an ester-forming derivative thereof, and a diol component consisting of 2-methyl-1,3-propanediol, 2-methyl-1,3-pentanediol, and ethylene glycol. become,
Calcium diethyl bis (3 , 5- Bis (1,1-dimethylethyl) -4-hydroxy phenyl methyl phosphonate) (Calciumdiethyl bis ((3,5-bis (1,1-dimethylethyl) -4-hydroxy phenyl methyl phosphonate)) 5 to 1,000 ppm is added based on the weight of each polyester resin, and when the resin is applied and composite spinning, the phenylamine component is added to the polyester (PET) resin of the first component and the second component of the copolymerized polyester resin. A heat-bonded composite fiber with excellent compression recovery, characterized by the addition of 200 to 2,000 ppm relative to the total weight.
According to paragraph 1,
The composite fiber is a heat-bonded composite fiber with excellent compression recovery, characterized in that the first component and the second component have a weight ratio of 80:20 to 20:80.
According to paragraph 1,
A heat-bonded composite fiber with excellent compression recovery, characterized in that the cross-section of the composite fiber is circular or hollow.