JPH0364561A - Polyester non-woven fabric - Google Patents

Abstract

PURPOSE:To provide the subject non-woven fabric having flame resistance and excellent stretchability and elastic recovery by employing polyester fibers containing ethylene terephthalate groups as main structural units and copolymerized with a specific phosphorus compound. CONSTITUTION:The objective non-woven fabric comprises (A) a polyester fiber containing ethylene terephthalate group as main structural unit and copolymerized with a bifunctional phosphorus compound of the formula [R1 and R2 are 1-18C alkyl, aryl, monohydroxyalkyl or H; R3 is alkyl or aryl; A is CnH2n ((n) is 1-4)] in an amount of 0.15-4.0wt.% as the phosphorus element and (B) a polyester fiber comprising two kinds of polyester components containing ethylene terephthalate group as main structural unit, the polyester components being eccentrically bonded to each other and either one of the polyester components being copolymerized with a large amount of (sodium sulfo) isophthalate groups in an amount of 3.0-6.0mol%, and contains the phosphorus compound in an amount of >=0.1wt.% as the phosphorus element.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a polyester nonwoven fabric, and more particularly to a polyester nonwoven fabric that is flame retardant and has excellent stretchability and elastic recovery.

[Conventional technology]

Polyester fibers have excellent mechanical properties, thermal stability, washability, etc., and are therefore widely used in clothing applications in coexistence with natural fibers.

However, from the viewpoint of respect for humanity and fire prevention, various polyester processed moldings are required to be flame retardant, and they are suitable for use in winter work in special environments where fire is involved, such as firefighting or blast furnaces, while being easy to move and with excellent heat retention. There is a demand for a highly stretchable flame-retardant nonwoven fabric.

Flame retardant technology for polyester fibers has been known for a long time, but phosphorus-based flame retardants are the most preferred in consideration of flame retardant performance itself, basic characteristics of delicateness, weather resistance, etc. Methods for applying this phosphorus-based flame retardant include a method of chemically or physically applying or impregnating the flame retardant to the surface or inside of the molded material (post-processing method), and a method of kneading the flame retardant into the molded material (blending method). ), a method of copolymerizing a flame retardant during polymerization (copolymerization method), and other methods have been proposed. However, the post-processing method causes a decrease in flame retardant performance due to washing, and in the case of nonwoven fabrics that place emphasis on stretchability, the stretching performance may be significantly lowered. In the blending method, problems such as deterioration of flame retardant performance and discoloration due to washing become apparent as well, and it is difficult to improve flame retardant performance without causing problems such as deterioration of yarn reeling properties. For these reasons, it is thought that a technique of copolymerizing a phosphorus-based flame retardant to make it flame retardant is preferable. 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 since it is generally difficult to obtain a phosphorus copolymerized polyester with a high degree of polymerization, it is necessary to improve the fiber properties. Phosphorus compounds that can be highly copolymerized without damage are quite limited.

From the above, the actual situation is that there is no flame-retardant polyester nonwoven fabric with a high S1 heel on the market.

[AJl that the invention tries to solve! [Problem] An object of the present invention is to overcome the current state of the prior art and provide a highly functional material having excellent flame retardancy and elasticity.

[Means to solve the problem]

The above-mentioned problem of the present invention is to provide a polyester fiber-containing material whose main structural unit is ethylene terephthalate and which is copolymerized with a bifunctional phosphorus compound represented by the following formula in an amount of O, 15 to 4.0% by weight as a phosphorus element. Two types of polyester components whose units are ethylene terephthalate are joined together eccentrically, and one component has an isophthalate group or a sodium sulfoisophthalate group in a range of 3.0 to 6.0 mol% within 4 times. The problem can be solved by a nonwoven fabric made of polyester fibers copolymerized in a large amount, characterized in that the bifunctional phosphorus compound contains O, 1% by weight or more as an elemental amount of phosphorus. can.

R+OP A-COR2 3 However, R1 and R2 are alkyl groups having 1 to 18 carbon atoms,
an aryl group, a monohydroxyalkyl group, or a hydrogen atom, R3 is an alkyl group or an aryl group, and A is -C1H
2o- and 11 represents an integer from 1 to 4.

The present invention will be explained in detail below.

Containing polyester fibers (hereinafter referred to as
The main structural unit of the fiber A of the present invention is ethylene terephthalate, which is copolymerized with a bifunctional phosphorus compound shown by the following formula.

R+0-P-A-COR2 3 where R,, R2 is an alkyl group having 1 to 18 carbon atoms,
an aryl group, a monohydroxyalkyl group, or a hydrogen atom, R3 is an alkyl group or an aryl group, and A is -C1H
2n- and n represents an integer of 1 to 4. in particular,
(2-carboxyethyl)methylphosphinic acid, (2
-methoxycarbonylethyl)methylphosphinic acid, (
Examples include 2-(β-hydroxyethoxycarbonyl)ethyl)methylphosphinic acid, methyl (2-methoxycarbonylethyl)methylphosphinate, and ethylene glycol ester of (2-(β-hydroxyethoxycarbonyl)ethyl)methylphosphinic acid. .

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

110- In the fiber A of the present invention, 0.15 to 4.0% by weight of the phosphorus compound described above is copolymerized as the phosphorus element amount, and the nonwoven fabric of the present invention using the above fiber is It is necessary to contain O0 soil mass% or more as the phosphorus element content.

When the amount of phosphorus copolymerized in the fiber A of the present invention is less than 0.15% of phosphorus element 8, the level of flame retardance is low, and the nonwoven fabric made with this has low flame retardancy and stretchability. At the same time, you will not be satisfied. If it exceeds 4.0% by weight, the polymer will be colored during polymerization, and the physical properties of the resulting fibers will also be significantly reduced. Furthermore, if the copolymerized amount of the phosphorus compound contained in the nonwoven fabric is less than 0.1% by weight, sufficient flame retardance cannot be obtained.

Polyester fiber b (hereinafter referred to as
The fiber B of the present invention is made by eccentrically joining two types of polyester components whose main structural unit is ethylene terephthalate, and one component has an isophthalate group or a sodium sulfoisophthalate group. 0-6.0
It is necessary that the fiber is copolymerized in a large amount within the range of mol%. This 7- gives the stretchability and elastic recovery properties of the nonwoven fabric of the present invention. The difference in these copolymerization components is 3. If it is less than 0 mol %, the crimp development power will be insufficient, and if it exceeds 6.0 mol %, the basic properties of the fiber will be significantly deteriorated and the spinning stability will be reduced.

Further, the composite form of the fiber B of the present invention may have any form as long as it is joined eccentrically, but a side-by-side type is preferable than an eccentric core-sheath type because it has better crimp development ability. . The ratio of the composite components may be any within the range that provides the desired performance, but is usually 40:60 to C.
About 50:40 is preferable.

Of course, in the fiber A or B used for the nonwoven fabric of the present invention, a part of the acid component or a part of the glycol component may be mixed with other dicarboxylic acid components, such as adipic acid, etc., to the extent that the desired performance is not impaired. such as sebacic acid components, or other glycol components such as diethylene glycol.

Propylene glycol, trimethylene glycol.

It may also be a copolymerized polyester substituted with tetramethylene glycol, neopentyl glyco8-lua1,4-cyclohexanedimethanol, polyethylene glycol, bisphenol A component, or the like. Furthermore, the polyester component used in the fiber A or B of the present invention contains various additives, such as a matting agent, in order to improve its properties as a practical fiber.

Gloss improvers, heat resistant agents, weathering agents, antioxidants, coloring agents such as pigment dyes, fillers, 11F anti-static agents, etc. may be used. In this case, the cross-sectional shape is not limited to a circular shape, but may also be a triangular cross-section or an irregularly shaped cross-section.

In the polyester nonwoven fabric of the present invention, the fiber A of the present invention
The blending ratio of B and B is such that the phosphorus compound contained in the nonwoven fabric is O,1
Any amount may be used as long as it is at least 50% by weight, but in order to expect sufficient stretchability, the blending ratio of fiber B should be, for example, 50 to 80%.
It is preferable to make it as high as % by weight. Further, more preferably, the nonwoven fabric of the present invention is blended with fiber A such that the content of the phosphorus compound contained in the nonwoven fabric is 0.5% by weight or more as the amount of phosphorus element, and the blending ratio of fiber B is 55% by weight. By doing so, the nonwoven fabric that satisfies these conditions exhibits higher stretchability and flame retardancy.

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

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 crimp 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 it exceeds 13/1 nch, neps are likely to occur. In addition, if spiral crimp occurs in step 1) U after the carding process, neps are generated and the uniformity of the web deteriorates, and the web is likely to sag.

Therefore, in the composite fiber of the present invention, spiral crimp becomes latent and mechanical crimp of 8 to 18/1 ncl+ is dominant, and when spiral crimp is developed by heat treatment etc., the number of crimp is 30 crimp/1 nch or more. The fibers having the following properties are most 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 fiber 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 needled. Needling may be performed in a needle room. A non-woven fabric may be formed by water jet punching instead of needling. Further, other raw cotton may be blended. For example, the fibers A and B of the present invention may be further blended with Botmelt type binder fibers, needled, and then heat treated to fuse the fibers.

〔Example〕

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

Example 1 Intramolecular cyclic anhydride of 2-carboxyethylmethylphosphinic acid and 100 parts of bis-β-hydroxyethyl terephthalate and its low polymer obtained by a direct 11-contact esterification method using terephthalic acid and ethylene glycol were added. A reaction product obtained by heating and reacting a mixture of ethylene glycol in a 1:1 weight ratio at 120°C was added in an amount of 1.0% by weight as an elemental amount of phosphorus, and then antimony dioxide and titanium dioxide were added, and then the temperature was gradually raised. and reduced pressure. finally 28
Polymerization was carried out to a predetermined viscosity under 11 g of 8'Cv O, a mm to obtain a phosphorus copolymerized polyester polymer (intrinsic viscosity: 0.47).

This polyester chip was spun using a spindle with a round cross section and 360 holes to obtain an undrawn yarn.

Spinning temperature is 285℃, take-up speed is 15001TI/
It was a minute. This undrawn yarn was subjected to drawing heat treatment, mechanically crimped, and cut to obtain a polyester fiber (fiber A).

Furthermore, using polyethylene terephthalate copolymerized with 4.0 mol% of isophthalic acid as one component and ordinary polyethylene terephthalate as the other component, undrawn yarns of 12-side-by-side type composite fibers with a composite ratio of 1:1 were made. Obtained.

The spinning temperature was 285° C. and the take-up speed was 1500 m/min. This undrawn yarn was subjected to a stretching heat treatment, mechanically crimped, and cut to obtain a polyester fiber (11! fiber n).

The obtained fibers A and B and hot melt type binder fiber (
Raw cotton C) was mixed in a weight ratio of 30:60:10 to prepare a web, which was then 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. ◎Very good O 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, and was simply evaluated as follows: ◎ Very good O Good △ Fairly good × Poor. The results are shown on the topsoil.

Examples 2-6. Comparative examples 1 to 3 Polymerization was carried out under the same conditions as in Example 1 except as shown in Table 1.

A nonwoven fabric was produced in the same manner as in Example 1 using fibers A and B obtained by spinning and drawing. The obtained results are shown on the topsoil.

Comparative Examples 4 and 5 As shown in Table 1, polymers were produced in which a large amount of each copolymer component was added. As a result, Comparative Example 4 was extremely discolored;
In Comparative Example 5, in composite spinning, the polymer bending during discharge was large and stable yarn production was not possible.

(Hereinafter, blank spaces) 13-14- [Effects of the present invention] The polyester nonwoven fabric of the present invention has flame retardancy and can provide padded cotton or nonwoven fabric with excellent elasticity. Furthermore, since the composite fiber of the present invention does not seep out of flame retardant components, it is hygienic and the S flammability effect is less likely to deteriorate.

In addition, the polyester nonwoven fabric of the present invention can be manufactured without generating nemp or unopened fiber portions in the carding process.

By using the nonwoven fabric of the present invention as a lining material, it has become possible to obtain winter clothing suitable for winter work in special environments where fire is handled, such as firefighting or blast furnaces.

Claims (1)

[Claims] A bifunctional phosphorus compound whose main structural unit is ethylene terephthalate and is represented by the following formula has a phosphorus element content of 0.15
~4.0% by weight copolymerized polyester fiber A,
Two types of polyester components whose main structural unit is ethylene terephthalate are joined eccentrically, and one component contains a large amount of isophthalate group or sodium sulfoisophthalate group within the range of 3.0 to 6.0 mol%. 1. A nonwoven fabric made of polyester fiber B copolymerized with a polyester fiber B, characterized in that the bifunctional phosphorus compound component is contained in an amount of 0.1% by weight or more as an elemental amount of phosphorus. ▲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.