JPH0364520A - Polyester conjugate yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to polyester composite fibers, specifically spun yarns, woven and knitted fabrics, padded cotton or The present invention relates to polyester composite fibers suitable for obtaining nonwoven fabrics.

[Conventional technology]

Polyester fibers have excellent mechanical properties, thermal stability, washability, etc., so they are widely used in clothing applications, mainly in the clothing industry, in coexistence with natural fibers.

However, from the viewpoint of respect for humanity and fire prevention, various polyester processed molded products are required to be flame retardant, and in particular, for car racing such as F-King, excellent materials that have both flame retardancy and elasticity are required. is required. Also,
For winter work in special environments where fire is involved, such as firefighting or blast furnaces, materials that are easy to move in and have excellent heat retention properties, that is, flame-retardant nonwoven fabrics with high stretchability, are required.

Flame retardant technology for polyester fibers has been known for a long time, but in addition to the flame retardant performance itself, there are
In consideration of weather resistance, phosphorus-based flame retardants are most preferred. Methods of applying this phosphorus-based flame retardant include chemically or physically applying or impregnating the flame retardant to the surface or inside of the molded product (post-processing method), and a method of kneading the flame retardant during molding (blending method). Methods have been proposed, including a method of copolymerizing a flame retardant during polymerization (copolymerization method), and a method of copolymerizing a flame retardant during polymerization. However, post-processing methods result in a decrease in flame retardant performance due to washing, and often have problems with the texture, and in the case of nonwoven fabrics that place emphasis on stretchability, they may significantly reduce stretch performance.

In the blending method as well, problems such as deterioration of flame retardant performance and coloration due to washing become apparent, and further problems such as deterioration of yarn reeling properties are likely to occur, making it difficult to improve flame retardant performance. For these reasons, it is thought that a technique of copolymerizing a phosphorus-based flame retardant to make it flame retardant is preferable. However, even with this copolymerization method, it is necessary to copolymerize a phosphorus compound at a high rate in order to improve flame retardant performance, and it is generally difficult to obtain a phosphorus co-3-polymerized polyester with a high degree of polymerization. Phosphorus compounds that can be highly copolymerized without impairing properties are quite limited.

From the above, the reality is that flame-retardant polyester composite fibers with high stretch have not existed on the market.

[Problem that the invention seeks to solve]

The object of the present invention is to overcome the current state of the prior art and to find and provide a highly functional material having excellent flame retardancy and elasticity.

[Means to solve the problem]

The above-mentioned object of the present invention is to prepare a bifunctional phosphorus compound represented by the following formula in which two or more types of polyester components are joined eccentrically, with a phosphorus element content of 0. 1-3. Composite fiber containing 0% by weight of the above-mentioned bifunctional phosphorus compound in one component as an elemental amount of 0.0% by weight. This problem can be solved by polyester composite fibers characterized by being copolymerized in a larger amount than other components in the range of 3 to 30% by weight.

4-0 R+OP-A C0R2 3 However, Ray R2 is an alkyl group having 1 to 8 carbon atoms, an aryl group, a monohydroxyalkyl group, or a hydrogen atom, R3 is an alkyl group or an aryl group, and A is -Co
H2o- and r) represents an integer of 1 to 4.

The present invention will be explained in detail below.

The two or more types of polyesters used in the polyester composite fiber m of the present invention (hereinafter referred to as the fiber of the present invention) are polyesters containing 90% by weight or more of polyethylene terephthalate, polybutylene terephthalate, and their aromatic polyesters.

Furthermore, the fiber of the present invention must contain a difunctional phosphorus compound represented by the following formula.

3 However, R1 and R2 are an alkyl group, aryl group, monohydroxyalkyl group or hydrogen atom having t to 1.8 carbon atoms, R3 is an alkyl group or an aryl group, and A is -Co
II2o- and n represents an integer of 1-4. Specifically, (2-carboxyethyl)methylphosphinic acid,
(2-methoxycarbonylethyl)methylphosphinic acid, (2-(β-hydroxyethoxycarbonyl)ethyl)methylphosphinic acid, methyl (2-methoxycarbonylethyl)methylphosphinate, (2-(β-hydroxyethoxycarbonyl)ethyl) ) Examples include ethylene glycol ester of methylphosphinic acid.

Among these phosphorus compounds, 2-
This is an acid product produced by a heating reaction between the intramolecular cyclic anhydride of carboxyethylmethylphosphinic acid and ethylene glycol. Alternatively, a material obtained by further condensation of this reactive acid product is also preferred.

In the fiber of the present invention, the above-mentioned phosphorus compound is contained in an amount of 0°1 to 3.
It is necessary to contain 0% by weight. If the content is less than 0% by weight, the flame retardance of the resulting fibers will be insufficient. Also, 3.
If it exceeds 0% by weight, not only will the physical properties of the poly-10-ester fibers significantly deteriorate,
The coloring becomes severe and the quality is degraded.

In addition, the two or more types of polyester components of the fiber of the present invention include:
One component must be copolymerized with a difunctional phosphorus compound in an amount of 0.3 to 3.0% by weight as an elemental amount of phosphorus compared to other components.

This is because spiral crimp is obtained due to the difference in the copolymerization rate of the polymers, and when the volume is 0.3%, the crimp form is insufficient. Moreover, if it exceeds 3.0% by weight, the amount of bifunctional phosphorus compound contained in one component increases, which not only significantly deteriorates the physical properties of the polyester fiber but also causes severe discoloration.

Furthermore, the fiber of the present invention needs to be a composite fiber in which two or more of these polyester components are eccentrically joined. This is to obtain spiral crimp either latently or overtly, and there are no particular limitations as long as they are joined eccentrically, but the side-by-side type is clever in that it has a better ability to develop crimp than the core-sheath type. Delicious.

The composite ratio of the components of these composite fibers may be in any range as long as it exhibits the desired crimp performance. For example, when the number of composite components is 2, the component with a large amount of phosphorus copolymerization is 40 to 60%. Good weight percentage.

It is also preferred that one of the polyester components is copolymerized with an isophthalate group or a metal sulfonate-containing group. However, this further enhances the stretchability and elastic recovery properties of the composite fiber obtained. Therefore, it is more preferable that the isophthalate group or the metal sulfonate-containing group is a polyester copolymerized with a large amount of phosphorus compound. This is the case when the components are copolymerized.

However, in this case, the phosphorus compound and isophthalate 1 component or metal sulfonate component copolymerize, which tends to cause severe coloring of the polymer.To prevent this, the amount of copolymerization of isobutyrate group or metal sulfonate group is 3 mol%. It is better to keep it below.

Furthermore, in the polyester component of the fiber of the present invention, a part of the acid component or a part of the glycol component may contain 8- other dicarboxylic acid components, such as adipic acid and sebacic acid components, to the extent that the desired performance is not impaired. etc. or other glycol ingredients.

For example, copolymerized polyesters substituted with diethylene glycol, propylene glycol, trimethylene glycol, tetramethylene glycol, neopentyl glycol, 1,4-cyclohexanedimethanol, polyethylene glycol, bisphenol A component, etc. may be used.

The polyester component used in the composite fiber of this invention contains various additives, such as a gloss TLL agent and a gloss improver, in order to improve its properties as a practical fiber.

Heat resistant agents, weather resistant agents, antioxidants, coloring agents such as pigment dyes,
It may also contain fillers, antistatic agents, and the like.

In this case, the above-mentioned additive may be localized in either one, or may be distributed in any ratio between the two. Furthermore, the cross-sectional shape is not limited to a circular shape, but may also be a triangular cross-section or other irregularly shaped cross-section.

As a method for producing the fiber of the present invention, an apparatus and method for producing a 2Ht polyester composite fiber can be used. It is also possible to produce it using a high speed spinning method of 6000 m/min or higher.

In addition, when the fibers of the present invention are made into short fibers to be used as spun yarn or nonwoven fabric, it is preferable that no neps or unspread portions occur during the carding process; There is a close relationship with the crimping form; in the case of mechanical crimping, if the number of crimps is less than 8/1 nch, unopened portions are likely to occur, and if the number of crimps exceeds 8/1 nch, hops are likely to occur. Furthermore, if spiral crimp occurs before the carding process, neps will occur and the uniformity of the web will deteriorate, and web crimping is likely to occur.

Therefore, in the composite fiber of the present invention, spiral crimping is latent and mechanical crimps of 8 to 18 pieces/1 nch are dominant, and when spiral crimping occurs due to heat treatment etc., the number of crimps is 3.
Fibers with a fiber count of 0 pieces/1 nch or more are preferable. The method for producing such composite fibers is not particularly limited, but an example is a method in which undrawn yarn spun with the composition of the present invention is drawn and then heat treated under tension.

The fibers of the present invention can be made into a nonwoven fabric by a conventional nonwoven fabric manufacturing method, and an example will be shown below. The fibers of the present invention are cut into short fibers, carded in a conventional manner to form a web, and then subjected to needling. Needling may be performed in a needle room. A non-woven fabric may be formed by water jet punching instead of needling. It may also be blended with other raw cotton; for example, it may be blended with hot-melt binder fibers, needled, and then heat-treated to fuse the fibers together.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example ↓ Bis-β-hydroxyethyl terephthalate obtained by direct esterification using terephthalic acid and ethylene glycol and 100 parts of its low polymer, an intramolecular cyclic anhydride of 2-carboxyethylmethylphosphinic acid, and ethylene glycol 1 The reaction product obtained by heating a mixture with a weight ratio of :1 at 120°C has a phosphorus element content of 1. After adding 0% by weight and further adding antimony dioxide and titanium dioxide, the temperature was gradually increased and the pressure was reduced. Finally 288℃, 0,
3 mm and 11 g to obtain a phosphorus copolymerized polyester polymer (intrinsic viscosity: 0.47).

Polyethylene terephthalate polymer (intrinsic viscosity: 0.6
8), an undrawn yarn of a composite fiber with a composite ratio l: [Nosu/r biside type composite fiber was prepared. The spinning temperature was 285°C and the take-up speed was 1500 m/min. These undrawn yarns were subjected to drawing heat treatment, mechanically crimped in a stuffing box, and then cut to obtain polyester fibers.

The obtained polyester composite fibers and hot-melt type binder fibers were blended at a weight ratio of 90:10 to form a web, which was heat-treated at 160° C. to obtain a nonwoven fabric.

The stretch recovery properties of the obtained nonwoven fabric are sensually divided into four stages. O very good 12- ○ Good Δ Slightly good × Not possible A simple evaluation was made.

The flame retardancy of the nonwoven fabric was rated in four stages based on the combustion state after being ignited with a burner: ◎ Very good ○ Good △ Fairly good × Poor. The results are shown in Table 1.

Examples 2 and 3 Comparative Examples 1 to 3 Phosphorus copolymerized polyester polymers were obtained under the same conditions as in Example 1, except that the amount of phosphorus added was changed as shown in Table 1. In the case of Comparative Example 3, the coloring of the polymer was severe and the I
V drop was likely to occur.

Further, under the same conditions as in Example ↓, polyester composite fibers were made into a nonwoven fabric. The results are shown on the topsoil.

Examples 4 and 5, Comparative Example 4 As Examples 4 and 5, phosphorus copolymerized polyester polymers were obtained under the same conditions as in Example 1, except that isophthalic acid was copolymerized in addition to the phosphorus compound as shown in Table 2. Also, comparative example 4
3.0 with only isophthalic acid without adding phosphorus compounds.
A polyester polymer was obtained by copolymerizing mol%.

Using these polymers, composite fibers were obtained under the same conditions as in Example 1 to obtain nonwoven fabrics. The results are shown in Table 2.

Examples 6 and 7, Comparative Example 5 Examples 6 and 7 and Comparative Example 5 were made using polyester polymers produced under the same conditions as Example 1, except that the phosphorus copolymerization rate was changed as shown in Table 3. It was made into fibers and non-woven fabrics. The results are shown in Table 3. Comparative Example 5 had a small difference in phosphorus copolymerization rate, resulting in a nonwoven fabric with poor elasticity.

(Hereinafter, blank spaces) 3-14-15- [Effects of the present invention] According to the present invention, the present invention is suitable for obtaining spun yarns, woven fabrics, padded cotton, or nonwoven fabrics that are flame retardant and have excellent elasticity. A polyester composite fiber is provided. Further, since the composite fiber of the present invention does not seep out of flame retardant components, it is hygienic and the flame retardant effect is less likely to deteriorate.

By using the fibers of the present invention, it is possible to obtain uniforms for FL car racing, which must have high flame retardancy and elasticity. In addition, it is possible to obtain an inner jacket or nonwoven fabric for winter clothing suitable for winter work in special environments where fire is involved, such as firefighting or blast furnaces.

Claims (1)

[Claims] (1) A bifunctional phosphorus compound in which two or more polyester components are eccentrically joined and represented by the following formula has a phosphorus element content of 0.1
Composite fiber containing ~3.0% by weight of the above-mentioned bifunctional phosphorus compound in one component as an elemental amount of 0.3~3.0% by weight.
A polyester composite fiber characterized by being copolymerized in a larger amount than other components in the range of 3.0% by weight. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ However, R_1 and R_2 are alkyl groups with 1 to 18 carbon atoms, aryl groups, monohydroxyalkyl groups, or hydrogen atoms, R_3 is an alkyl group or aryl group, and A is -
C_nH_2_n-, and n represents an integer of 1 to 4.