JP2855505B2 - Polyester fiber weight loss accelerator and alkali weight loss treatment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester fiber weight loss promoter and an alkali weight loss method using the weight loss promoter.

[0002]

2. Description of the Related Art Hitherto, various studies have been made on a weight loss accelerator as a pretreatment agent in the alkali weight reduction applied to a fibrous structure of polyester fiber .
Polyethylene terephthalate fiber and unmodified polyethylene
Terephthalate fiber combination of the fiber structure and modified port of
Ethylene terephthalate component and unmodified polyethylene
In the case of a fiber structure of a conjugate fiber of a phthalate component, the weight loss is promoted to a fiber or a composite component of unmodified polyethylene terephthalate by alkali weight reduction by using a known weight loss accelerator such as a quaternary ammonium salt, and as a fiber structure. There is a problem that remarkable reduction in strength occurs.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polyester fiber weight loss promoter which preferentially promotes alkali weight loss of polyester fibers, especially modified polyethylene terephthalate components or modified polyethylene terephthalate fibers. Modified polyether with accelerator
Tylene terephthalate and unmodified polyethylene terephthale
When a fiber structure of the configuration of caustic at over preparative denaturing port
Promotes weight loss of ethylene terephthalate and remains unchanged
Another object of the present invention is to suppress the weight loss of the conductive polyethylene terephthalate and reduce the decrease in strength.

[0004]

The present invention provides a divalent or trivalent compound.
A polyester fiber weight loss promoter consisting of a polyhydric alcohol ethylene oxide adduct formed by adding 2 mol or more of ethylene oxide to the polyhydric alcohol, and a third component in the range of 2 to 15 mol% by copolymerization with polyethylene terephthalate. Modified polyethylene terephthalate and unmodified
Alkali-weight reduction treatment, comprising impregnating a fibrous structure composed of conductive polyethylene terephthalate with a weight-loss accelerator composed of the polyhydric alcohol ethylene oxide adduct, heat-treating at a temperature of 100 ° C. or more, and then performing alkali weight-loss treatment. In the way.

[0005] In the present invention, the two
Examples of the polyhydric or trihydric alcohol include dihydric alcohols such as ethylene glycol, propylene glycol, hydrobenzoin, benzopinacol, cyclopentane-1,2-diol, and cyclohexane-1,4-diol.
Trihydric alcohols such as glycerin are exemplified.

The polyhydric alcohol ethylene oxide adduct constituting the weight loss accelerator of the present invention is produced by adding 2 mol or more of ethylene oxide to such a polyhydric alcohol, and the addition reaction method is not particularly limited. , Generated by commonly known methods. In the present invention, examples of the polyhydric alcohol ethylene oxide adduct preferably used as a weight loss accelerator include an ethylene oxide 5 to 30 mol adduct of ethylene glycol and a glycerin ethylene oxide 3 to 28 mol adduct.

[0007] Weight loss promoting agent of the present invention, polyester, which particularly significantly promoting weight loss of modified polyethylene terephthalate, since the influence of the relative unmodified polyethylene terephthalate is extremely small, modified polyethylene
It is effectively used in reducing the alkali of a fiber structure in which terephthalate and unmodified polyethylene terephthalate coexist.

In the present invention, the polyester is a polymer whose main repeating unit is ethylene terephthalate.
It refers to chromatography, the modified polyethylene terephthalate, polyethylene terephthalate with a third component by copolymerizing polyethylene terephthalate in the range of 2 to 15 mol% denatured
In preparative (hereinafter referred to simply as modified polyester), unmodified poly
With ethylene terephthalate , the third component of the copolymer is 0.5%.
Substantially only ethylene terephthalate units of less than mol%
Consisting of polyethylene terephthalate (hereinafter simply unmodified
Polyester) .

The third component includes dicarboxylic acids such as isophthalic acid, hexahydroterephthalic acid, adipic acid, sebacic acid, cyclohexanedicarboxylic acid and azelaic acid, tricarboxylic acids such as trimellitic acid, diethylene glycol, tetramethylene glycol, hexamethylene Examples thereof include diols such as glycol, hexanediol, bisphenol A and bisphenol B, which are used alone or in combination of two or more.

In the present invention, the modified polyester is preferably polyethylene terephthalate obtained by copolymerizing an aliphatic dicarboxylic acid such as adipic acid and sebacic acid with 5-sodium sulfoisophthalic acid, particularly preferably 3 to 7 mol% of adipic acid. , polyethylene terephthalate obtained by copolymerizing 1.5 to 4 mol% of 5-sodium sulfoisophthalic acid
Tarates are used.

In the present invention, the fibrous structure composed of the modified polyester and the unmodified polyester refers to a yarn, a knit, a woven fabric, a nonwoven fabric and a modified fiber of a composite fiber containing the modified polyester and the unmodified polyester as a composite component. A yarn, knit, woven or cross-knitted, cross-woven, cross-woven, knitted, woven or non-woven fabric obtained by blending, blending, twisting or the like in which fibers made of polyester and fibers of unmodified polyester are combined in an arbitrary form. Say. The ratio of the modified polyester and the unmodified polyester in the fiber structure may be arbitrary.

When reducing the alkali weight of a fiber structure composed of the modified polyester and the unmodified polyester,
As a pretreatment of the alkali weight reduction treatment, the fiber structure is impregnated with a weight loss accelerator composed of a polyhydric alcohol ethylene oxide adduct, and heat-treated.

[0013] The impregnation with the weight loss accelerator is carried out when the weight loss accelerator concentration is 5%.
An aqueous solution of 00 g / l or less, preferably 250 g / l or less is dipped, padded, or the like. An additive such as a sizing agent may be contained in the aqueous solution for promoting weight loss, if necessary. After impregnation, use dry heat, high-temperature steam, high-pressure steam, etc.
To 210 ° C, preferably 160 to 190 ° C, 140 to 210 ° C, preferably 170 to 200 ° C for high-temperature steam, 100 to 140 ° C, preferably 105 to 130 ° C for high-pressure steam.
Heat treatment at a temperature of at least 100 ° C.

In the impregnation and heat treatment of the weight loss accelerator in the present invention, the modified polyester has a looser amorphous structure than that of the unmodified polyester, so that the polyhydric alcohol as the weight loss accelerator is used. The ethylene oxide adduct easily penetrates into the amorphous part structure, and the permeated polyhydric alcohol ethylene oxide adduct swells and exhibits a remarkable weight loss promoting effect during alkali weight reduction treatment.

The alkali reduction treatment is carried out by a method usually applied to polyester fibers, such as alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, and alkaline earth metal hydroxides such as calcium hydroxide and magnesium hydroxide. A fibrous structure is immersed by using an alkali such as a product and optionally using an amine such as triethanolamine, diethanolamine, monoethanolamine or the like to prepare an aqueous alkali solution. The treatment conditions can be appropriately changed according to the fiber fineness of the fiber structure, the weight loss rate, and the like.
The concentration is appropriately selected within the range of 00 g / l, and is preferably 50 g / l or less in the case of a fibrous structure of fine fibers. The processing temperature is 80 to 120 ° C, preferably 90 to 1
10 ° C.

The degree of alkali weight loss, that is, the weight reduction rate, is limited to the weight of the modified polyester which is easily hydrolyzed and is partially reduced from the weight loss at which the entire modified polyester is hydrolyzed within the minimum necessary for the substantial weight loss of the unmodified polyester. The weight loss to be hydrolyzed, that is, the weight loss range from 100 to 0.5% by weight can be arbitrarily determined.

In the alkali weight reduction treatment of the present invention, the difference in weight loss between the modified polyester and the unmodified polyester is enlarged by impregnation with a weight loss accelerator and pretreatment of heat treatment, and the weight loss rate ratio of the modified polyester to the unmodified polyester is increased. Is 10 or more, and the weight of the modified polyester in the fiber structure can be easily controlled by, for example, the treatment time when the weight of the alkali is reduced.

[0018]

The present invention will be described below in more detail with reference to examples.

Example 1 5 mol% of adipic acid and 5-
Plain knitting of 24G using a yarn obtained by twisting a modified polyester fiber 75d / 48f made of 2.25 mol% of sodium sulfoisophthalic acid copolymerized polyethylene terephthalate and a polyethylene terephthalate fiber 75d / 36f at a twist number of 120 T / M. did. This knitted fabric was immersed in a 200 g / l aqueous solution of a 10 mol adduct of glycerin ethylene oxide, and squeezed to an aqueous solution adhesion amount of 100%. Then 1
After drying at 00 ° C., heat treatment was performed for 2 minutes with high-temperature steam at 180 ° C. and 90% RH.

Thereafter, the pretreated knitted fabric was subjected to a weight reduction treatment at a boiling temperature for 90 minutes in a 15 g / l aqueous solution of sodium hydroxide and an aqueous alkali solution having a bath ratio of 1:50. The obtained knitted fabric is
The modified polyester fiber is completely hydrolyzed and the weight loss rate is 10
0% by weight, the unmodified polyethylene terephthalate fiber had a weight loss rate of 3% by weight, and the weight loss rate ratio of the modified polyester fiber to the polyethylene terephthalate fiber was 33. In addition, the obtained knitted fabric had a strength of 144 g and an elongation of 21.0% while the strength before the alkali weight reduction treatment was 200 g and the elongation was 27.5%.

(Comparative Example) In Example 1, a pretreatment and an alkali reduction treatment were carried out in the same manner as in Example 1 except that a quaternary ammonium salt was used instead of the glycerin ethylene oxide 10 mol adduct. In the obtained knitted fabric, both the modified polyester fiber and the polyethylene terephthalate fiber were reduced in weight, the weight loss was 71.9% by weight in the whole knitted fabric, and the strength was 42.
3 g and an elongation of 11.2%.

[0022]

The weight loss promoter of the present invention is a polyester fiber, especially a modified polyethylene terephne copolymerized with a third component.
Exert a significant weight loss promoting effect upon caustic respect tallates fibers, using the weight loss promoting agent of the present invention further modified port
Polyethylene terephthalate and unmodified polyethylene tereph
According to the method of the present invention for reducing the alkali after pretreatment of a fibrous structure composed of tallate , unmodified polyethylene
Without any way promoting weight loss terephthalate component or fibers, which significantly promotes weight loss modified polyethylene terephthalate component or fibers, it can be minimized strong decrease, yarn breakage as a fiber structure.

Claims (2)

(57) [Claims] 1. A polyester fiber weight loss promoter comprising a polyhydric alcohol ethylene oxide adduct formed by adding at least 2 moles of ethylene oxide to a dihydric or trihydric polyhydric alcohol. 2. A modified polyethylene obtained by copolymerizing a third component with polyethylene terephthalate in the range of 2 to 15 mol%.
Weight loss consisting of a polyhydric alcohol ethylene oxide adduct formed by adding 2 mol or more of ethylene oxide to a dihydric or trihydric polyhydric alcohol to a fiber structure composed of terephthalate and unmodified polyethylene terephthalate A method for treating alkali weight loss, comprising impregnating an accelerator, heat-treating at a temperature of 100 ° C. or higher, and then subjecting to alkali weight loss treatment.