KR20110059368A - Crystalline low melting polyester binder resin, binder fiber and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A binder fiber using crystalline low melting point polyester binder resin is provided to enable adhesion by heat flame without an organic solvent. CONSTITUTION: A method for manufacturing a crystalline low melting point polyester binder resin comprises: a step of mixing acid ingredients containing 40-79 mol% of terephthalate, 20-40 mol% of isophthalic acid, and 1-20 mol% of adipic acid and diol ingredients containing 80-99 mol% of ethylene glycol and 1-20 mol% of 1,4-butanediol. The reaction ratio of the acid ingredient and diol ingredient is 1:1.1-1:2.

Description

Crystalline low melting polyester binder resin, binder fiber using same and manufacturing method thereof {CRYSTALLINE LOW MELTING POLYESTER BINDER RESIN, BINDER FIBER AND MANUFACTURING METHOD THEREOF}

The present invention relates to a crystalline low-melting polyester binder resin, a binder fiber using the same and a method for manufacturing the same, specifically, easy to process at a temperature of 100 ℃ or less, excellent polyester adhesive binder resin, binder fiber using the same And it relates to a manufacturing method thereof.

In general, in the manufacture of articles in which fiber structures such as mattresses, interior materials for automobiles, or various nonwoven fabrics are bonded to each other, hot melt binder fibers are used to bond different types of fibers that form each fiber structure. Low melting point polyester binder fibers having excellent adhesion and heat resistance compared to components have been mainly used.

These low melting polyester binder fibers are made by synthesis of acid components such as terephthalic acid, isophthalic acid and aliphatic dicarboxylic acids having 30 or less carbon atoms, and diol components such as diethylene glycol, tetramethylene glycol, neopentyl glycol and polyethylene glycol. In addition, the physical properties such as melting point can be controlled according to the type, content, etc. of the acid component and the diol component, and thus, properties such as processability and adhesiveness of the polyester binder fiber may be greatly influenced.

For example, US Pat. No. 4,296,475 introduced low melting point copolyesters mainly composed of terephthalic acid and isophthalic acid. However, this requires a temperature of more than 190 ° C for thermal bonding, which is uneconomical due to energy loss. Due to the nature of the heat resistance and formability is low, there is a disadvantage that easily causes thermal deformation.

In addition, U.S. Patent Invention No. 44065439 introduces a low melting point polyester using terephthalic acid, isophthalic acid, adipic acid, ethylene glycol, and neopentyl glycol, but the melting point is too low at 45 to 60 ° C. There is.

In addition, Korean Patent Publication No. 2001-11548 used terephthalic acid and phthalic anhydride as dicarboxylic acid components and ethylene glycol and diethylene glycol as diol components, but high temperature (270-290 ° C) which is a general polyethylene terephthalate copolymerization condition , Pyrolysis and side reactions occur at high vacuum (less than 1torr), causing polymer color defects.

In addition, Japanese Patent Application Laid-Open No. 1998-298271 discloses a low melting polyester fiber produced by using adipic acid as a dicarboxylic acid component and butanediol as a diol component. It leads to sex problems and poor adhesion.

In addition, the conventional low melting polyester binder fiber has a low crystallization rate, so that the adhesiveness is weakened, thereby deteriorating the function as a binder. In addition, such low-melting polyester binder fibers are not economical because they are mainly subjected to high temperature processing in excess of 100 ° C. during hot melt processing, and in most cases, low adhesive strength and low temperature resistance result in morphological deformation. It has been used in a limited way for thermal bonding between fibers.

Therefore, the composition of the acid component and the diol component makes it easy to process at a relatively low melting point in terms of energy saving, and has a fast crystallization rate, which has excellent adhesion and physical properties and is applicable to various applications. Requires a high level of skill.

Although a general polyester binder resin is manufactured to have an extreme viscosity of more than 0.61 and hot melt adhesion is performed by hot air, the present invention manufactures an extreme viscosity of a polyester binder resin of 0.61 or less to produce a hot melt at 100 ° C. or less. It is intended to facilitate the molding process. In addition, since the use of a lower intrinsic viscosity than the conventional binder resin, the adhesive, heat resistance and high temperature of the polyester binder using a second copolymer composition to increase the crystallinity and flexibility of the polymer molecular chain to compensate for the problem of deterioration of physical properties This is to compensate for the significant drop in morphological stability and toughness.

In order to solve the above problems, an object of the present invention is to condensate an acid component and a diol component to an extreme viscosity of 0.61 or less, more preferably 0.50 to 0.60, and a glass transition temperature (Tg) of 40 ° C. or more, preferably 40 to 60 It is provided with a polyester binder resin having no melting point and no softening temperature of 100 ° C. or lower, preferably 80 to 100 ° C., wherein the polyester binder resin is a cis-core or side-by-side form. Crystalline low melting point polyester binder with excellent adhesion and heat resistance, excellent molding processability at 100 ℃ or below, preferably 80 ~ 100 ℃, and excellent heat adhesion, heat resistance and excellent touch after processing. It is to provide a fiber.

Another object of the present invention is to provide a crystalline low-melting polyester binder fiber that can be applied for building materials, in particular for wood insulation in addition to the adhesion between fibers, excellent adhesion.

In order to achieve the above object, the present invention provides an acid component comprising 40 to 79 mol% of terephthalic acid, 20 to 40 mol% of isophthalic acid, and 1 to 20 mol% of adipic acid, and 80 to 99 mol% of ethylene glycol and 1,4-butanediol 1 Condensation polymerization of the diol component containing ˜20 mol% provides a crystalline low melting point polyester binder resin having no melting point and a softening temperature of 80 to 100 ° C.

In addition, the present invention is characterized in that the intrinsic viscosity of the crystalline low melting polyester resin is 0.50 to 0.61.

The present invention also provides a sheath-core or side-by-side composite fiber comprising the crystalline low melting polyester binder resin.

In addition, the present invention is that the fineness of the crystalline low-melting polyester binder fiber is 0.3 to 15 mono denier, the fiber length is 1 to 100mm is good to exhibit excellent adhesion and touch.

In addition, the present invention has good workability even when the crystalline low melting polyester binder fiber is hot melt processed by hot air at a processing temperature of 60 to 100 ° C.

In addition, the present invention is the crystalline low-melting point polyester binder fiber can be used as a building material, in particular the building material is characterized in that the wood insulation.

In addition, the present invention is a method for producing a crystalline low-melting polyester binder resin, the acid component containing 40 to 79 mol% of terephthalic acid, 20 to 40 mol% of isophthalic acid and 1 to 20 mol% of adipic acid and 80 to ethylene glycol Mix the diol component containing 99 mol% and 1,4-butanediol 1-20 mol%, but mix so that the reaction ratio of acid component and diol component is 1: 1.1-1: 2 at 200-270 ° C. and 700-1500 torr Ester reactant preparation step of esterification in; To the ester reactant, 0.01 to 0.04 parts by weight of antimony trioxide and 0.001 to 0.01 part by weight of tetrabutyl titanate were added to 100 parts by weight of the ester reactant. Condensation polymerization step of polymerizing to form a polymer while; It provides a method for producing a crystalline low-melting polyester binder resin comprising a; and continuing the polymerization reaction of the condensation-polymerized polymer, the viscosity control step of terminating the reaction when the ultimate viscosity is 0.50 ~ 0.61.

In addition, the present invention relates to a method for producing a crystalline low melting polyester binder fiber, wherein the crystalline low melting polyester binder resin produced by the above method and a polyester resin having a melting point of 230 to 280 ° C. are sheath-core or side- A composite spinning step of spinning a bi-side type to be a fiber having a fineness of 0.3 to 15 mono denier at an area ratio of 8: 2 to 2: 8 and an elongation ratio of 2.0 to 4.5; and cutting the composite spun fiber to 1 to 100 mm; It provides a method for producing a crystalline low melting polyester binder fiber comprising.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

The terms "about "," substantially ", etc. used to the extent that they are used herein are intended to be taken to mean an approximation of, or approximation to, the numerical values of manufacturing and material tolerances inherent in the meanings mentioned, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure.

The present invention relates to a polyester binder resin and a binder fiber prepared by using the same, and in detail, terephthalic acid (TPA), Acid components in the form of dicarboxylic acids, including adipic acid (AA), isophthalic acid (IPA), ethylene glycol (EG), 1,4-butanediol (BD) Polycondensation of the diol component containing a), so that the polycondensation product of the acid component and diol component of the general polyester binder resin exhibits an extreme viscosity of more than 0.61 so as to exhibit an extreme viscosity of less than 0.61, more preferably 0.50 to 0.60 By condensation polymerization, a melting point does not appear, and a softening temperature is 100 ° C. or less, and more preferably, a polyester binder resin having low softening behavior of 80 to 100 ° C. is prepared, and the polyester binder resin prepared above is sheath-core. Core) or Side-by-Side composite fiber made to have uniform fiber cross-section and excellent molding processability under 100 ℃ and excellent adhesion, heat resistance and feel Out to fiber bonding as well as on the polyester binder fibers can be applied as a binder for wood insulating material excellent in molding processability of the hot melt (Hot-Melt) by less than 100 ℃ hot air (Hot-Air) for liver.

The present invention includes an acid component comprising 40 to 79 mol% of terephthalic acid, 20 to 40 mol% of isophthalic acid, and 1 to 20 mol% of adipic acid, and 80 to 99 mol% of ethylene glycol and 1 to 20 mol% of 1,4-butanediol. Condensation polymerization of the diol component to provide a crystalline low melting point polyester binder resin having no melting point and a softening temperature of 80 to 100 ° C.

Specifically, the method for preparing the crystalline low melting polyester binder resin of the present invention is in addition to 40 to 79 mol% of terephthalic acid, which is an acid component in the form of dicarboxylic acid, during condensation polymerization of terephthalic acid (TPA) and ethylene glycol (EG). 20 to 40 mol% of isophthalic acid (IPA), preferably 25 to 35 mol%, and 1 to 20 mol% of adipic acid (AA), preferably 5 to 10 mol%, are added as copolymerized components of the acid component, and ethylene glycol is a diol component. (EG) In addition to 80 to 99 mol%, 1 to 20 mol% of 1,4-butanediol, preferably 5 to 10 mol%, is added as a copolymerization component of the diol component and the reaction ratio of the dicarboxylic acid component and the diol component is 1: 1.1 to 1.2. By mixing Prepare an ester reactant which is esterified at 200 to 270 ° C. and 700 to 1500 Torr. (S100) 0.01 to 0.04 part by weight of antimony trioxide, tetrabutyl titanate, based on 100 parts by weight of the ester reactant to the prepared ester reactant. After adding 0.001 to 0.01 parts by weight and gradually increasing the temperature to 250 ~ 300 ℃, the polymerization reaction to form a polymer with a reduced pressure to 0.1 to 1.0 Torr, preferably 0.5 Torr to proceed the condensation polymerization (S200), The ultimate viscosity during the polymerization of the polycondensation polymer is 0.50 ~ 0.61 When the reaction is terminated by adjusting the viscosity (S300) when the crystalline low-melting polyester binder resin of the present invention can be prepared. Antimony trioxide and tetrabutal titanate used in the present invention are catalysts which are added to increase the reactivity of the copolymerization components of the present invention and to adjust the viscosity required. Therefore, if the temperature, pressure, and catalyst content of the present invention is less than the above range, the polymerization of each reactant does not occur smoothly, it is difficult to form a polymer (Polymer) there is a fear that the viscosity of the formed polymer is too low. In addition, the overall physical properties of the polymer thus formed is deteriorated so that the function of the general polymer can not be exhibited. If the above range is exceeded, side reactions may occur due to a sudden increase in reaction rate, polymer color defects, and gelation of the polymer in the reaction tube are expected.

At this time, isophthalic acid (IPA) used in the present invention is to form a low-melting polyester by lowering the melting point of the polyester, if the content of isophthalic acid is used in less than 20 mol% 100 ℃ or less, Preferably, it is difficult to have a low melting point function that is easy to hot melt processing in hot air of 80 to 100 ° C, and when used in excess of 40 mol%, it acts as a determinant of crystallinity and does not show any further melting point lowering effect as generally known. In addition, adipic acid (AA) added as another acid component increases the fluidity of the entire molecular chain of the copolyester and does not interfere with the crystallinity of 1,4-butanediol (BD) included as the diol component. By lowering the melting point of the coalescence, easy processability is secured, and the flexibility of the molecular chain is secured to improve the tearing property at the time of binding. If the content of such adipic acid (AA) is less than 1 mol%, the desired melting point decreases and the flexibility of the polyester may not be obtained. If the content of the adipic acid (AA) is less than 20 mol%, the crystallinity of the copolyester is lowered, and the glass transition temperature is too high. There is a limit to use as a low-melting polyester having a heat resistance can not obtain a glass transition temperature of 40 ℃ or more.

Meanwhile, 1,4-butanediol (BD), which is used as the diol component of the present invention, is a material having strong crystallinity, which maintains crystallinity during copolymerization, and thus has a melting point of 1 to 10 ° C., preferably about 5 ° C., than the melting point of the copolymer. Thermal bonding is possible even at low temperatures, and there is no deformation at a temperature below the melting point. Therefore, if the content of 1,4-butanediol is less than 1 mol%, the desired crystallinity cannot be obtained. If the content of the 1,4-butanediol exceeds 20 mol%, the thermal stability and the spinning time may occur due to the generation of large amount of tetrahydrofuran (THF) during the polycondensation reaction. There is a risk of poor operation.

The crystalline low melting polyester resin of the present invention is a binder fiber capable of hot melt molding processing by hot air of 100 ° C. or less, preferably 80 ° C. to 100 ° C., which will be described later, in which the intrinsic viscosity is 0.61 or less, preferably 0.50 to 0.60. May be provided. The general low melting point polyester binder resin is manufactured to have an intrinsic viscosity exceeding 0.61, and the hot melt processing temperature due to hot air exceeds 100 ° C., thus making it difficult to perform efficient molding.

However, in order to overcome this problem, the present invention has an intrinsic viscosity of 0.61 or less, preferably 0.50 to 0.60, more preferably 0.52 to 0.58. In order to overcome the problems of low adhesion, heat resistance and shape stability at high temperatures, toughness of the binder resin caused by the low extreme viscosity as described above, in the present invention, adipic acid (AA), diol in the acid component during polyester copolymerization 1,4-butanediol (BD) is added to a component to manufacture crystalline low melting polyester binder resin.

Therefore, the crystalline low melting point polyester binder resin thus prepared has no melting point and exhibits a softening temperature of 80 to 100 ° C., and this feature is easy to moldability even at 100 ° C. or lower, and has excellent adhesiveness and heat resistance, that is, a form at high temperatures. Good for showing stability.

In another embodiment, the present invention provides a crystalline low melting polyester binder fiber which is a sheath-core or side-by-side type composite fiber comprising the above crystalline low melting polyester binder resin.

1 is a manufacturing process of the crystalline low melting polyester binder fiber according to an embodiment of the present invention. Referring to Figure 1, the crystalline low melting polyester binder fiber of the present invention is a composite spinning step S400 to the crystalline low melting polyester binder resin prepared through the ester reactant preparation step S100, condensation polymerization step S200, viscosity control step S300 , Cutting step S500 may be further included.

The method for producing a crystalline low melting polyester binder fiber of the present invention is a crystalline low melting polyester binder resin prepared by the above method and a polyester resin having a melting point of 230 ~ 280 ℃ in the sheath-core or side-by-side type It includes a composite spinning step S400 for spinning to be a fineness of 0.3 to 15 mono denier at an area ratio of 8: 2 to 2: 8, the draw ratio of 2.0 to 4.5, and the step of cutting the composite spun fiber to 1 to 100mm;

Specifically, the crystalline low melting point polyester binder fiber of the present invention is a crystalline low melting point polyester binder resin prepared by the above-described sheath (Sheath) portion, melting point 230 ~ 280 ℃ general polyester resin core It is good to increase the adhesiveness and feel by composite spinning with a negative part and sheath: core = 8: 2 ~ 2: 8, preferably 6: 4 ~ 4: 6. In addition, a draw ratio of 1.0 to 4.5, preferably 2.5 to 4.0, is good for providing spin stability so that the fibers are not cut. In addition, adjusting the fineness to be 0.3 to 15 deniers (De), preferably 2 to 6 deniers and 1 to 100 mm in length is good for enhancing adhesiveness and feel.

The crystalline low melting point polyester binder fiber of the present invention prepared as described above is characterized in that the processing temperature is 60 ~ 100 ℃ by hot melt processing by hot air. Therefore, the crystalline low-melting polyester binder fiber of the present invention can be thermally bonded even at a low temperature of less than 100 ℃, stable adhesive strength and form even at a high temperature, compared to the conventional binder fibers are heat bonded at a temperature exceeding 100 ℃ Stability can be maintained.

Due to these characteristics, the crystalline low-melting polyester binder fiber of the present invention is not only used for bonding between fibers, but also used as a polyester binder for building materials, in particular, a binder for wood insulation, showing excellent adhesion. It can be applied to other new uses.

As described above, the crystalline low melting polyester binder resin of the present invention is lower than the conventional resin having an intrinsic viscosity of more than 0.61. Even in the intrinsic viscosity of 0.50 to 0.61, chip formation and fibrosis formation of the resin are easy, and hot melt processing by hot air of 100 ° C. or less is possible.

In addition, the crystalline low-melting polyester binder fiber of the present invention can be bonded by heat fusion without the use of an organic solvent when used as a binder has an environmentally friendly effect.

In addition, the crystalline low melting polyester binder fiber of the present invention is not only easy to hot melt processing at 100 ℃ or less, 80 ~ 100 ℃ but also excellent adhesiveness and heat resistance has the effect of maintaining excellent shape stability even at high temperature.

In addition, the crystalline low-melting polyester binder fiber of the present invention is applied as a binder for building materials, preferably wood insulation, as well as existing inter-fiber adhesion, developed for a new use, excellent adhesion, heat resistance, form at high temperatures There is an effect that stability is provided.

Through the following examples will be described in more detail.

Example  One

Preparation of Crystalline Low Melting Point Polyester Binder Resin

Terephthalic acid (TPA) / isophthalic acid (IPA) / adipic acid (AA) (65/30/5, mol%) as acid and ethylene glycol (EG) / 1,4-butanediol (BD) as diol (95 / 5, mol%) was adjusted to a reaction ratio of 1: 1.6 of an acid component and a diol component, and esterified by obtaining an esterification reaction at 250 ° C. under 1140 Torr pressure. The reaction rate was 97.5%. The formed ester reactant was transferred to a polycondensation reactor, and 0.02 parts by weight of antimony trioxide and 0.005 parts by weight of tetrabuttal titanate were added to 100 parts by weight of the ester reactant, and the temperature was raised to 280 ° C. while gradually depressurizing to a final pressure of 0.5 Torr. The polycondensation reaction was carried out until 0.54.

Crystallinity Low melting point  Preparation of Polyester Binder Fiber

The low melting polyester binder resin prepared as described above was used as a sheath component, and the core component was a mono 4 having an area ratio of 6: 4 and an elongation ratio of 3.5 using a conventional polyethylene terephthalic acid chip (melting point of 260 ° C.). Spinning to denia to prepare a crystalline low melting polyester binder fiber made of a composite fiber having a fiber length of 6mm.

Physical properties of the binder resin and the fiber prepared as described above are shown in Table 2 below.

Example  2

The acid component is terephthalic acid (TPA) / isophthalic acid (IPA) / adipic acid (AA) (60/30/10, mol%) and the diol component is ethylene glycol (EG) / 1,4-butanediol (BD) (90 / 10, mol%), and the reaction was carried out in the same manner as in Example 1 except that the reaction was carried out so that the intrinsic viscosity was 0.57.

Comparative example  One

Except that the acid component was adjusted with terephthalic acid (TPA) / isophthalic acid (IPA) (70/30, mol%) and diol component with ethylene glycol (EG) (100 mol%) and the intrinsic viscosity was 0.58. It carried out similarly to Example 1.

Comparative example  2

Except that the acid component was adjusted to terephthalic acid (TPA) / isophthalic acid (IPA) (65/35, mol%) and the diol component with ethylene glycol (EG) (100 mol%) and reacted to an intrinsic viscosity of 0.56. It carried out similarly to Example 1.

Comparative example  3

Except for the reaction of the acid component with terephthalic acid (TPA) / isophthalic acid (IPA) (65/35, mol%) and the diol component with ethylene glycol (EG) (100 mol%) and the ultimate viscosity to 0.65. It carried out similarly to Example 1.

Comparative example  4

The acid component is terephthalic acid (TPA) / isophthalic acid (IPA) / adipic acid (AA) (65/30/5, mol%) and the diol component is ethylene glycol (EG) / 1,4-butanediol (BD) (95: 5 mol%), and the reaction was carried out in the same manner as in Example 1 except that the reaction was performed so that the intrinsic viscosity was 0.62.

Comparative Example 6

The acid component is terephthalic acid (TPA) / isophthalic acid (IPA) / adipic acid (AA) (60/30/10, mol%) and the diol component is ethylene glycol (EG) / 1,4-butanediol (BD) / diethylene It was carried out in the same manner as in Example 1 except that the reaction was adjusted to glycol (DEG) (90/10/5, mol%) and the intrinsic viscosity was 0.64.

※Test Methods

1.Measurement of mol% of copolymerization component

Mol% of the copolymerization component added for the preparation of the crystalline low melting polyester binder resin was dissolved in a mixed solvent of chloroform and trifluoroacetic acid (4: 1), and Bruker's proton nuclear magnetic resonance analyzer ( ^1). H-NMR, model name: AMX-300).

2. Extreme Viscosity (IV) Measurement

The copolyester was dissolved in phenol / tetrachloroethane (weight ratio 60/40) and measured at 35 ° C. with a Uberod viscometer with a concentration of 0.5 g / dl.

3. Melting point, glass transition temperature and softening behavior

The temperature difference was measured at 20 ℃ / min using a thermal differential scanning calorimeter (Perkin Elmer, DSC-7), and the softening behavior was measured using a dynamic thermal measuring instrument (Perkin Elmer, TMA-7) if no melting point was present. Measured.

4. Adhesive Evaluation

After cutting the prepared binder fiber into a fiber sheet of 6mm, it was mixed with the wood insulation material, and then evaluated the adhesive processability by hot melt under hot-air conditions at 90 to 100 ° C / 60 seconds. : Very good, (circle): Excellent, (triangle | delta): Normal, x: It evaluated as poor.

5. Tactile Evaluation

Sensory evaluation was conducted by comparing internal touch with internal touches, and evaluated as ◎: very good, ○: excellent, △: normal, and ×: poor.

[Table 1] Copolymer composition ratio and intrinsic viscosity of crystalline low melting polyester binder resin

division
Copolymer Composition Ratio (mol%)
Extreme viscosity
Acid Diol component TPA IPA AA EG BD DEG Example 1 65 30 5 95 5 - 0.54 Example 2 60 30 10 90 10 - 0.57 Comparative Example 1 70 30 - 100 - - 0.58 Comparative Example 2 65 35 - 100 - - 0.56 Comparative Example 3 65 35 - 100 - - 0.65 Comparative Example 4 65 30 5 95 5 - 0.62 Comparative Example 5 60 30 10 90 10 - 0.61 Comparative Example 6 60 30 10 85 10 5 0.64

[Table 2] Thermal Characteristics of Crystalline Low Melting Polyester Binder Resin and Functional Evaluation According to Fiber Preparation

division IV Melting point (캜) Softening Temperature (℃) Glass transition temperature (캜) Adhesive touch Example 1 0.54 - 83 57 ◎ ◎ Example 2 0.57 - 84 48 ◎ ◎ Comparative Example 1 0.58 - 101 63 △ × Comparative Example 2 0.56 - 102 64 △ × Comparative Example 3 0.65 - 109 68 × × Comparative Example 4 0.62 - 105 64 × ○ Comparative Example 5 0.61 - 99 61 △ ○ Comparative Example 6 0.64 - 99 61 △ ○

According to the results of Table 2, the crystalline low melting point polyester resin of the present invention had a high crystallinity and no melting point, and the softening temperature was measured to be 80 to 100 ° C. It was confirmed. In addition, when comparing Example 1 and Comparative Example 4, the fiber of Example 1, which has a lower limit of intrinsic viscosity even though the same composition is shown to exhibit better adhesion and feel, the limit of the crystalline low melting polyester binder resin It can be seen that controlling the viscosity to 0.50 to 0.60 is an important factor.

In addition, the adhesion evaluation to the wood insulation in the adhesion evaluation results, it was confirmed that the crystalline low-melting polyester binder fibers of the present invention can be applied to new applications such as building materials, in particular wood insulation.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be clear to those who have knowledge of.

1 is a manufacturing process of the crystalline low melting polyester binder fiber according to an embodiment of the present invention.

Claims (9)

Acid component containing 40-79 mol% of terephthalic acid, 20-40 mol% of isophthalic acid, and 1-20 mol% of adipic acid, and diol component containing 80-99 mol% of ethylene glycol and 1-20 mol% of 1,4-butanediol A polycrystalline low melting point polyester binder resin having no melting point and a softening temperature of 80 to 100 ° C. The method of claim 1, The crystalline low melting polyester resin is a crystalline low melting polyester binder resin having an intrinsic viscosity of 0.50 ~ 0.61. A crystalline low melting polyester binder fiber which is a sheath-core or side-by-side type composite fiber comprising the crystalline low melting polyester binder resin of claim 1. The method of claim 3, The crystalline low melting point polyester binder fiber is 0.3-15 mono fineness, crystalline low melting point polyester binder fiber having a length of 1 to 100mm. The method of claim 3, The crystalline low melting polyester binder fiber is a crystalline low melting polyester binder fiber having a processing temperature of 60 ~ 100 ℃ by hot melt processing by hot air. The method of claim 3, The crystalline low melting polyester binder fibers are crystalline low melting polyester binder fibers used as building materials. The method of claim 6, The building material is a crystalline low-melting polyester binder fiber is a wood insulation. In the method for producing a crystalline low melting polyester binder resin, Acid component containing 40-79 mol% of terephthalic acid, 20-40 mol% of isophthalic acid, and 1-20 mol% of adipic acid, and diol component containing 80-99 mol% of ethylene glycol and 1-20 mol% of 1,4-butanediol Mix but mix so that the reaction ratio of acid component and diol component is 1: 1.1 to 1: 2 Ester reactant preparation step of esterification reaction at 200 ~ 270 ℃, 700 ~ 1500 torr;  To the ester reactant, 0.01 to 0.04 parts by weight of antimony trioxide and 0.001 to 0.01 part by weight of tetrabutyl titanate were added to 100 parts by weight of the ester reactant. Condensation polymerization step of polymerizing to form a polymer while; And remind A viscosity control step of terminating the reaction when the ultimate viscosity becomes 0.50 to 0.61 while continuing the polymerization reaction of the polycondensation polymerized product; Method for producing a crystalline low melting polyester binder resin comprising a. In the method for producing a crystalline low melting polyester binder fiber, The crystalline low melting point polyester binder resin prepared by the method of claim 8 and the polyester resin having a melting point of 230 to 280 ° C. are cis-core or side-by-side in an area ratio of 8: 2 to 2: 8 and an extension ratio of 2.0 to 4.5. Composite spinning step to spin so that the fineness of 0.3 to 15 mono denier fibers; and Cutting the complex spun fiber into 1 to 100 mm; Method for producing a crystalline low melting polyester binder fiber comprising a.

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